/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013-2014 Tom Gundersen <teg@jklm.no> 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 <http://www.gnu.org/licenses/>. ***/ #include <netinet/ether.h> #include <linux/if.h> #include "networkd-link.h" #include "network-internal.h" static int ipv4ll_address_lost(Link *link) { _cleanup_address_free_ Address *address = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr addr; int r; assert(link); link->ipv4ll_route = false; link->ipv4ll_address = false; r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r < 0) return 0; log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); r = address_new_dynamic(&address); if (r < 0) { log_link_error(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, &link_address_drop_handler); r = route_new_dynamic(&route, RTPROT_UNSPEC); if (r < 0) { log_link_error(link, "Could not allocate route: %s", strerror(-r)); return r; } route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->metrics = IPV4LL_ROUTE_METRIC; route_drop(route, link, &link_route_drop_handler); link_client_handler(link); return 0; } static int ipv4ll_route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); assert(!link->ipv4ll_route); r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_error(link, "could not set ipv4ll route: %s", strerror(-r)); link_enter_failed(link); } link->ipv4ll_route = true; if (link->ipv4ll_address == true) link_client_handler(link); return 1; } static int ipv4ll_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); assert(!link->ipv4ll_address); r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_error(link, "could not set ipv4ll address: %s", strerror(-r)); link_enter_failed(link); } else if (r >= 0) link_rtnl_process_address(rtnl, m, link->manager); link->ipv4ll_address = true; if (link->ipv4ll_route == true) link_client_handler(link); return 1; } static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { _cleanup_address_free_ Address *ll_addr = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr address; int r; assert(ll); assert(link); r = sd_ipv4ll_get_address(ll, &address); if (r == -ENOENT) return 0; else if (r < 0) return r; log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", ADDRESS_FMT_VAL(address)); r = address_new_dynamic(&ll_addr); if (r < 0) return r; ll_addr->family = AF_INET; ll_addr->in_addr.in = address; 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, ipv4ll_address_handler); if (r < 0) return r; link->ipv4ll_address = false; r = route_new_dynamic(&route, RTPROT_STATIC); if (r < 0) return r; route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->metrics = IPV4LL_ROUTE_METRIC; r = route_configure(route, link, ipv4ll_route_handler); if (r < 0) return r; link->ipv4ll_route = false; 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); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; 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_link_warning(link, "IPv4 link-local error: %s", strerror(-event)); else log_link_warning(link, "IPv4 link-local unknown event: %d", event); break; } } int ipv4ll_configure(Link *link) { uint8_t seed[8]; int r; assert(link); assert(link->network); assert(IN_SET(link->network->link_local, ADDRESS_FAMILY_IPV4, ADDRESS_FAMILY_YES)); 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; return 0; }