/*-*- 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 "networkd.h" #include "libudev-private.h" #include "udev-util.h" #include "util.h" #include "virt.h" #include "bus-util.h" #include "network-internal.h" #include "network-util.h" #include "dhcp-lease-internal.h" static int ipv4ll_address_update(Link *link, bool deprecate); static bool ipv4ll_is_bound(sd_ipv4ll *ll); static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) { _cleanup_link_unref_ Link *link = NULL; uint16_t type; char *ifname; int r, ifindex; assert(manager); assert(manager->links); 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 = asprintf(&link->state_file, "/run/systemd/network/links/%"PRIu64, link->ifindex); if (r < 0) return -ENOMEM; r = asprintf(&link->lease_file, "/run/systemd/network/leases/%"PRIu64, link->ifindex); if (r < 0) return -ENOMEM; r = hashmap_put(manager->links, &link->ifindex, link); if (r < 0) return r; *ret = link; link = NULL; return 0; } static void link_free(Link *link) { if (!link) return; assert(link->manager); 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); hashmap_remove(link->manager->links, &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; uint64_t ifindex_64; assert(m); assert(m->links); assert(ifindex); assert(ret); ifindex_64 = ifindex; link = hashmap_get(m->links, &ifindex_64); if (!link) return -ENODEV; *ret = link; return 0; } static int link_enter_configured(Link *link) { assert(link); assert(link->state == LINK_STATE_SETTING_ROUTES); log_info_link(link, "link configured"); link->state = LINK_STATE_CONFIGURED; link_save(link); return 0; } 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->network->dhcp) { assert(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->network->ipv4ll) { assert(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; } } return r; } static void link_enter_failed(Link *link) { assert(link); if (link->state == LINK_STATE_FAILED) return; log_warning_link(link, "failed"); link->state = LINK_STATE_FAILED; link_stop_clients(link); link_save(link); } static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(link->route_messages > 0); assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_SETTING_ROUTES || link->state == LINK_STATE_FAILED); link->route_messages --; if (link->state == LINK_STATE_FAILED) 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", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); /* we might have received an old reply after moving back to SETTING_ADDRESSES, * ignore it */ if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) { log_debug_link(link, "routes set"); link_enter_configured(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; if (!link->network->static_routes && !link->dhcp_lease && (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false)) return link_enter_configured(link); log_debug_link(link, "setting routes"); LIST_FOREACH(static_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->route_messages ++; } if (link->ipv4ll && !link->dhcp_lease) { _cleanup_route_free_ Route *route = NULL; struct in_addr addr; r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r < 0 && r != -ENOENT) { log_warning_link(link, "IPV4LL error: no address: %s", strerror(-r)); return r; } if (r != -ENOENT) { r = route_new_dynamic(&route); if (r < 0) { log_error_link(link, "Could not allocate route: %s", strerror(-r)); return r; } route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->metrics = 99; r = route_configure(route, link, &route_handler); if (r < 0) { log_warning_link(link, "could not set routes: %s", strerror(-r)); link_enter_failed(link); return r; } link->route_messages ++; } } if (link->dhcp_lease) { _cleanup_route_free_ Route *route = NULL; _cleanup_route_free_ Route *route_gw = NULL; struct in_addr gateway; r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); if (r < 0 && r != -ENOENT) { log_warning_link(link, "DHCP error: %s", strerror(-r)); return r; } if (r >= 0) { r = route_new_dynamic(&route); if (r < 0) { log_error_link(link, "Could not allocate route: %s", strerror(-r)); return r; } r = route_new_dynamic(&route_gw); if (r < 0) { log_error_link(link, "Could not allocate route: %s", strerror(-r)); return r; } /* The dhcp netmask may mask out the gateway. Add an explicit * route for the gw host so that we can route no matter the * netmask or existing kernel route tables. */ route_gw->family = AF_INET; route_gw->dst_addr.in = gateway; route_gw->dst_prefixlen = 32; route_gw->scope = RT_SCOPE_LINK; r = route_configure(route_gw, link, &route_handler); if (r < 0) { log_warning_link(link, "could not set host route: %s", strerror(-r)); return r; } link->route_messages ++; route->family = AF_INET; route->in_addr.in = gateway; r = route_configure(route, link, &route_handler); if (r < 0) { log_warning_link(link, "could not set routes: %s", strerror(-r)); link_enter_failed(link); return r; } link->route_messages ++; } } if (link->route_messages == 0) { link_enter_configured(link); } return 0; } static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -ENOENT) log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not drop route: %s", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 0; } static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); assert(link->addr_messages > 0); assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED); link->addr_messages --; if (link->state == LINK_STATE_FAILED) 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", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); if (link->addr_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; if (!link->network->static_addresses && !link->dhcp_lease && (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false)) return link_enter_set_routes(link); log_debug_link(link, "setting addresses"); LIST_FOREACH(static_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->addr_messages ++; } if (link->ipv4ll && !link->dhcp_lease) { _cleanup_address_free_ Address *ll_addr = NULL; struct in_addr addr; r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r < 0 && r != -ENOENT) { log_warning_link(link, "IPV4LL error: no address: %s", strerror(-r)); return r; } if (r != -ENOENT) { r = address_new_dynamic(&ll_addr); if (r < 0) { log_error_link(link, "Could not allocate address: %s", strerror(-r)); return r; } ll_addr->family = AF_INET; ll_addr->in_addr.in = addr; ll_addr->prefixlen = 16; ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen); ll_addr->scope = RT_SCOPE_LINK; r = address_configure(ll_addr, link, &address_handler); if (r < 0) { log_warning_link(link, "could not set addresses: %s", strerror(-r)); link_enter_failed(link); return r; } link->addr_messages ++; } } if (link->dhcp_lease) { _cleanup_address_free_ Address *address = NULL; struct in_addr addr; struct in_addr netmask; unsigned prefixlen; r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr); if (r < 0) { log_warning_link(link, "DHCP error: no address: %s", strerror(-r)); return r; } r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); if (r < 0) { log_warning_link(link, "DHCP error: no netmask: %s", strerror(-r)); return r; } prefixlen = net_netmask_to_prefixlen(&netmask); r = address_new_dynamic(&address); if (r < 0) { log_error_link(link, "Could not allocate address: %s", strerror(-r)); return r; } address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = prefixlen; address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr; r = address_configure(address, link, &address_handler); if (r < 0) { log_warning_link(link, "could not set addresses: %s", strerror(-r)); link_enter_failed(link); return r; } link->addr_messages ++; } return 0; } static int address_update_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -ENOENT) log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not update address: %s", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 0; } static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -ENOENT) log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not drop address: %s", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 0; } static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { int r; r = sd_bus_message_get_errno(m); if (r < 0) log_warning("Could not set hostname: %s", strerror(-r)); return 1; } static int set_hostname(sd_bus *bus, const char *hostname) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r = 0; assert(hostname); log_debug("Setting transient hostname: '%s'", hostname); if (!bus) { /* TODO: replace by assert when we can rely on kdbus */ log_info("Not connected to system bus, ignoring transient hostname."); return 0; } r = sd_bus_message_new_method_call( 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(bus, m, set_hostname_handler, NULL, 0, NULL); if (r < 0) log_error("Could not set transient hostname: %s", strerror(-r)); return r; } static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (link->state == LINK_STATE_FAILED) 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", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 1; } static 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; } return 0; } static int dhcp_lease_lost(Link *link) { _cleanup_address_free_ Address *address = NULL; _cleanup_route_free_ Route *route_gw = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr addr; struct in_addr netmask; struct in_addr gateway; unsigned prefixlen; int r; assert(link); assert(link->dhcp_lease); log_warning_link(link, "DHCP lease lost"); r = address_new_dynamic(&address); if (r >= 0) { r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); if (r >= 0) { r = route_new_dynamic(&route_gw); if (r >= 0) { route_gw->family = AF_INET; route_gw->dst_addr.in = gateway; route_gw->dst_prefixlen = 32; route_gw->scope = RT_SCOPE_LINK; route_drop(route_gw, link, &route_drop_handler); } r = route_new_dynamic(&route); if (r >= 0) { route->family = AF_INET; route->in_addr.in = gateway; route_drop(route, link, &route_drop_handler); } } sd_dhcp_lease_get_address(link->dhcp_lease, &addr); sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); prefixlen = net_netmask_to_prefixlen(&netmask); address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = prefixlen; address_drop(address, link, &address_drop_handler); } if (link->network->dhcp_mtu) { uint16_t mtu; r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu); if (r >= 0 && link->original_mtu != mtu) { r = link_set_mtu(link, link->original_mtu); if (r < 0) { log_warning_link(link, "DHCP error: could not reset MTU"); link_enter_failed(link); return r; } } } if (link->network->dhcp_hostname) { const char *hostname = NULL; r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); if (r >= 0 && hostname) { r = set_hostname(link->manager->bus, ""); if (r < 0) log_error("Failed to reset transient hostname"); } } link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); return 0; } static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { sd_dhcp_lease *lease; struct in_addr address; struct in_addr netmask; struct in_addr gateway; unsigned prefixlen; struct in_addr *nameservers; size_t nameservers_size; int r; assert(client); assert(link); r = sd_dhcp_client_get_lease(client, &lease); if (r < 0) { log_warning_link(link, "DHCP error: no lease: %s", strerror(-r)); return r; } r = sd_dhcp_lease_get_address(lease, &address); if (r < 0) { log_warning_link(link, "DHCP error: no address: %s", strerror(-r)); return r; } r = sd_dhcp_lease_get_netmask(lease, &netmask); if (r < 0) { log_warning_link(link, "DHCP error: no netmask: %s", strerror(-r)); return r; } prefixlen = net_netmask_to_prefixlen(&netmask); r = sd_dhcp_lease_get_router(lease, &gateway); if (r < 0 && r != -ENOENT) { log_warning_link(link, "DHCP error: %s", strerror(-r)); return r; } if (r >= 0) log_struct_link(LOG_INFO, link, "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", link->ifname, ADDRESS_FMT_VAL(address), prefixlen, ADDRESS_FMT_VAL(gateway), "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), "PREFIXLEN=%u", prefixlen, "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway), NULL); else log_struct_link(LOG_INFO, link, "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u", link->ifname, ADDRESS_FMT_VAL(address), prefixlen, "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), "PREFIXLEN=%u", prefixlen, NULL); link->dhcp_lease = lease; if (link->network->dhcp_dns) { r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size); if (r >= 0) { r = manager_update_resolv_conf(link->manager); if (r < 0) log_error("Failed to update resolv.conf"); } } if (link->network->dhcp_mtu) { uint16_t mtu; r = sd_dhcp_lease_get_mtu(lease, &mtu); if (r >= 0) { r = link_set_mtu(link, mtu); if (r < 0) log_error_link(link, "Failed to set MTU " "to %" PRIu16, mtu); } } if (link->network->dhcp_hostname) { const char *hostname; r = sd_dhcp_lease_get_hostname(lease, &hostname); if (r >= 0) { r = set_hostname(link->manager->bus, hostname); if (r < 0) log_error("Failed to set transient hostname " "to '%s'", hostname); } } link_enter_set_addresses(link); return 0; } static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) { Link *link = userdata; int r = 0; assert(link); assert(link->network); assert(link->manager); if (link->state == LINK_STATE_FAILED) return; switch (event) { case DHCP_EVENT_NO_LEASE: log_debug_link(link, "IP address in use."); break; case DHCP_EVENT_EXPIRED: case DHCP_EVENT_STOP: case DHCP_EVENT_IP_CHANGE: if (link->network->dhcp_critical) { log_error_link(link, "DHCPv4 connection considered system critical, " "ignoring request to reconfigure it."); return; } if (link->dhcp_lease) { r = dhcp_lease_lost(link); if (r < 0) { link_enter_failed(link); return; } } if (event == DHCP_EVENT_IP_CHANGE) { r = dhcp_lease_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } } if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) { if (!sd_ipv4ll_is_running(link->ipv4ll)) r = sd_ipv4ll_start(link->ipv4ll); else if (ipv4ll_is_bound(link->ipv4ll)) r = ipv4ll_address_update(link, false); if (r < 0) { link_enter_failed(link); return; } } break; case DHCP_EVENT_IP_ACQUIRE: r = dhcp_lease_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } if (link->ipv4ll) { if (ipv4ll_is_bound(link->ipv4ll)) r = ipv4ll_address_update(link, true); else r = sd_ipv4ll_stop(link->ipv4ll); if (r < 0) { link_enter_failed(link); return; } } break; default: if (event < 0) log_warning_link(link, "DHCP error: %s", strerror(-event)); else log_warning_link(link, "DHCP unknown event: %d", event); break; } return; } static int ipv4ll_address_update(Link *link, bool deprecate) { int r; struct in_addr addr; assert(link); r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r >= 0) { _cleanup_address_free_ Address *address = NULL; log_debug_link(link, "IPv4 link-local %s %u.%u.%u.%u", deprecate ? "deprecate" : "approve", ADDRESS_FMT_VAL(addr)); r = address_new_dynamic(&address); if (r < 0) { log_error_link(link, "Could not allocate address: %s", strerror(-r)); return r; } address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = 16; address->scope = RT_SCOPE_LINK; address->cinfo.ifa_prefered = deprecate ? 0 : CACHE_INFO_INFINITY_LIFE_TIME; address->broadcast.s_addr = address->in_addr.in.s_addr | htonl(0xfffffffflu >> address->prefixlen); address_update(address, link, &address_update_handler); } return 0; } static int ipv4ll_address_lost(Link *link) { int r; struct in_addr addr; assert(link); r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r >= 0) { _cleanup_address_free_ Address *address = NULL; _cleanup_route_free_ Route *route = NULL; log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); r = address_new_dynamic(&address); if (r < 0) { log_error_link(link, "Could not allocate address: %s", strerror(-r)); return r; } address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = 16; address->scope = RT_SCOPE_LINK; address_drop(address, link, &address_drop_handler); r = route_new_dynamic(&route); if (r < 0) { log_error_link(link, "Could not allocate route: %s", strerror(-r)); return r; } route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->metrics = 99; route_drop(route, link, &route_drop_handler); } return 0; } static bool ipv4ll_is_bound(sd_ipv4ll *ll) { int r; struct in_addr addr; assert(ll); r = sd_ipv4ll_get_address(ll, &addr); if (r < 0) return false; return true; } static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { struct in_addr address; int r; assert(ll); assert(link); r = sd_ipv4ll_get_address(ll, &address); if (r < 0) return r; log_struct_link(LOG_INFO, link, "MESSAGE=%s: IPv4 link-local address %u.%u.%u.%u", link->ifname, ADDRESS_FMT_VAL(address), NULL); link_enter_set_addresses(link); return 0; } static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){ Link *link = userdata; int r; assert(link); assert(link->network); assert(link->manager); switch(event) { case IPV4LL_EVENT_STOP: case IPV4LL_EVENT_CONFLICT: r = ipv4ll_address_lost(link); if (r < 0) { link_enter_failed(link); return; } break; case IPV4LL_EVENT_BIND: r = ipv4ll_address_claimed(ll, link); if (r < 0) { link_enter_failed(link); return; } break; default: if (event < 0) log_warning_link(link, "IPv4 link-local error: %s", strerror(-event)); else log_warning_link(link, "IPv4 link-local unknown event: %d", event); break; } } 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 (link->network->dhcp) { 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; } } 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; } static int link_update_flags(Link *link, sd_rtnl_message *m) { unsigned flags, flags_added, flags_removed, generic_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->operstate; if ((link->flags == flags) && (link->operstate == operstate)) return 0; flags_added = (link->flags ^ flags) & flags; flags_removed = (link->flags ^ flags) & link->flags; generic_flags = ~(IFF_UP | IFF_LOWER_UP | IFF_DORMANT | IFF_DEBUG | IFF_MULTICAST | IFF_BROADCAST | IFF_PROMISC | IFF_NOARP | IFF_MASTER | IFF_SLAVE | IFF_RUNNING); if (flags_added & IFF_UP) log_debug_link(link, "link is up"); else if (flags_removed & IFF_UP) log_debug_link(link, "link is down"); if (flags_added & IFF_LOWER_UP) log_debug_link(link, "link is lower up"); else if (flags_removed & IFF_LOWER_UP) log_debug_link(link, "link is lower down"); if (flags_added & IFF_DORMANT) log_debug_link(link, "link is dormant"); else if (flags_removed & IFF_DORMANT) log_debug_link(link, "link is not dormant"); if (flags_added & IFF_DEBUG) log_debug_link(link, "debugging enabled in the kernel"); else if (flags_removed & IFF_DEBUG) log_debug_link(link, "debugging disabled in the kernel"); if (flags_added & IFF_MULTICAST) log_debug_link(link, "multicast enabled"); else if (flags_removed & IFF_MULTICAST) log_debug_link(link, "multicast disabled"); if (flags_added & IFF_BROADCAST) log_debug_link(link, "broadcast enabled"); else if (flags_removed & IFF_BROADCAST) log_debug_link(link, "broadcast disabled"); if (flags_added & IFF_PROMISC) log_debug_link(link, "promiscuous mode enabled"); else if (flags_removed & IFF_PROMISC) log_debug_link(link, "promiscuous mode disabled"); if (flags_added & IFF_NOARP) log_debug_link(link, "ARP protocol disabled"); else if (flags_removed & IFF_NOARP) log_debug_link(link, "ARP protocol enabled"); if (flags_added & IFF_MASTER) log_debug_link(link, "link is master"); else if (flags_removed & IFF_MASTER) log_debug_link(link, "link is no longer master"); if (flags_added & IFF_SLAVE) log_debug_link(link, "link is slave"); else if (flags_removed & IFF_SLAVE) log_debug_link(link, "link is no longer slave"); /* link flags are currently at most 18 bits, let's default to printing 20 */ if (flags_added & generic_flags) log_debug_link(link, "unknown link flags gained: %#.5x (ignoring)", flags_added & generic_flags); if (flags_removed & generic_flags) log_debug_link(link, "unknown link flags lost: %#.5x (ignoring)", flags_removed & generic_flags); carrier_gained = !link_has_carrier(link->flags, link->operstate) && link_has_carrier(flags, operstate); carrier_lost = link_has_carrier(link->flags, link->operstate) && !link_has_carrier(flags, operstate); link->flags = flags; link->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) { Link *link = userdata; int r; assert(link); if (link->state == LINK_STATE_FAILED) 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", 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; } return 0; } static int link_enslaved(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; } } if (!link->network->dhcp && !link->network->ipv4ll) return link_enter_set_addresses(link); return 0; } static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; assert(link); assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED); assert(link->network); link->enslaving --; if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0) { log_struct_link(LOG_ERR, link, "MESSAGE=%s: could not enslave: %s", link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); link_enter_failed(link); return 1; } log_debug_link(link, "enslaved"); if (link->enslaving == 0) link_enslaved(link); return 1; } static int link_enter_enslave(Link *link) { NetDev *vlan, *macvlan; 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->vlans) && hashmap_isempty(link->network->macvlans)) return link_enslaved(link); if (link->network->bridge) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%s: enslaving by '%s'", link->ifname, link->network->bridge->name, NETDEV(link->network->bridge), NULL); r = netdev_enslave(link->network->bridge, link, &enslave_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not enslave by '%s': %s", link->ifname, link->network->bridge->name, strerror(-r), NETDEV(link->network->bridge), NULL); link_enter_failed(link); return r; } link->enslaving ++; } if (link->network->bond) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%s: enslaving by '%s'", link->ifname, link->network->bond->name, NETDEV(link->network->bond), NULL); r = netdev_enslave(link->network->bond, link, &enslave_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not enslave by '%s': %s", link->ifname, link->network->bond->name, strerror(-r), NETDEV(link->network->bond), NULL); link_enter_failed(link); return r; } link->enslaving ++; } HASHMAP_FOREACH(vlan, link->network->vlans, i) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%s: enslaving by '%s'", link->ifname, vlan->name, NETDEV(vlan), NULL); r = netdev_enslave(vlan, link, &enslave_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not enslave by '%s': %s", link->ifname, vlan->name, strerror(-r), NETDEV(vlan), NULL); link_enter_failed(link); return r; } link->enslaving ++; } HASHMAP_FOREACH(macvlan, link->network->macvlans, i) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%s: enslaving by '%s'", link->ifname, macvlan->name, NETDEV(macvlan), NULL); r = netdev_enslave(macvlan, link, &enslave_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%s: could not enslave by '%s': %s", link->ifname, macvlan->name, strerror(-r), NETDEV(macvlan), NULL); link_enter_failed(link); return r; } link->enslaving ++; } return 0; } static int link_configure(Link *link) { int r; assert(link); assert(link->state == LINK_STATE_INITIALIZING); if (link->network->ipv4ll) { uint8_t seed[8]; r = sd_ipv4ll_new(&link->ipv4ll); if (r < 0) return r; if (link->udev_device) { r = net_get_unique_predictable_data(link->udev_device, seed); if (r >= 0) { r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); if (r < 0) return r; } } r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); if (r < 0) return r; r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); if (r < 0) return r; r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex); if (r < 0) return r; r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); if (r < 0) return r; } if (link->network->dhcp) { r = sd_dhcp_client_new(&link->dhcp_client); if (r < 0) return r; r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0); if (r < 0) return r; r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac); if (r < 0) return r; r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex); if (r < 0) return r; r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link); if (r < 0) return r; if (link->network->dhcp_mtu) { r = sd_dhcp_client_set_request_option(link->dhcp_client, 26); if (r < 0) return r; } } if (link_has_carrier(link->flags, link->operstate)) { r = link_acquire_conf(link); if (r < 0) return r; } return link_enter_enslave(link); } int link_initialized(Link *link, struct udev_device *device) { Network *network; int r; assert(link); assert(link->ifname); assert(link->manager); if (link->state != LINK_STATE_INITIALIZING) return 0; if (device) link->udev_device = udev_device_ref(device); log_debug_link(link, "link initialized"); r = network_get(link->manager, device, link->ifname, &link->mac, &network); if (r == -ENOENT) { link_enter_unmanaged(link); return 0; } 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 0; } int link_add(Manager *m, sd_rtnl_message *message, Link **ret) { Link *link; _cleanup_udev_device_unref_ struct udev_device *device = NULL; char ifindex_str[2 + DECIMAL_STR_MAX(int)]; int r; assert(m); assert(message); assert(ret); r = link_new(m, message, ret); if (r < 0) return r; link = *ret; log_debug_link(link, "link added"); if (detect_container(NULL) <= 0) { /* not in a container, udev will be around */ sprintf(ifindex_str, "n%"PRIu64, link->ifindex); device = udev_device_new_from_device_id(m->udev, ifindex_str); if (!device) { log_warning_link(link, "could not find udev device"); return -errno; } if (udev_device_get_is_initialized(device) <= 0) /* not yet ready */ return 0; } r = link_initialized(link, device); if (r < 0) return r; return 0; } int link_update(Link *link, sd_rtnl_message *m) { struct ether_addr mac; char *ifname; int r; assert(link); assert(link->ifname); assert(m); 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; } if (!link->original_mtu) { r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu); if (r >= 0) log_debug_link(link, "saved original MTU: %" PRIu16, link->original_mtu); } /* 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; } } } } return link_update_flags(link, m); } int link_save(Link *link) { _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; const char *admin_state, *oper_state = "unknown"; int r; assert(link); assert(link->state_file); assert(link->lease_file); assert(link->manager); r = manager_save(link->manager); if (r < 0) return r; admin_state = link_state_to_string(link->state); assert(admin_state); if (link->operstate == IF_OPER_DORMANT) oper_state = "dormant"; else if (link_has_carrier(link->flags, link->operstate)) oper_state = "carrier"; r = fopen_temporary(link->state_file, &f, &temp_path); if (r < 0) goto finish; fchmod(fileno(f), 0644); fprintf(f, "# This is private data. Do not parse.\n" "ADMIN_STATE=%s\n" "OPER_STATE=%s\n" "FLAGS=%u\n", admin_state, oper_state, link->flags); if (link->dhcp_lease) { r = dhcp_lease_save(link->dhcp_lease, link->lease_file); if (r < 0) goto finish; fprintf(f, "DHCP_LEASE=%s\n", link->lease_file); } else unlink(link->lease_file); fflush(f); if (ferror(f) || rename(temp_path, link->state_file) < 0) { r = -errno; unlink(link->state_file); unlink(temp_path); } finish: if (r < 0) log_error("Failed to save link data to %s: %s", link->state_file, strerror(-r)); 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", }; DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);