/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright (C) 2014 Intel Corporation. All rights reserved. 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 "sd-dhcp6-client.h" #include "network-internal.h" #include "networkd-link.h" static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link); static int dhcp6_lease_information_acquired(sd_dhcp6_client *client, Link *link) { return 0; } static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { if (link->rtnl_extended_attrs) { log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism"); link->rtnl_extended_attrs = false; dhcp6_lease_address_acquired(link->dhcp6_client, link); return 1; } log_link_error_errno(link, r, "Could not set DHCPv6 address: %m"); link_enter_failed(link); } else if (r >= 0) manager_rtnl_process_address(rtnl, m, link->manager); return 1; } static int dhcp6_address_change(Link *link, struct in6_addr *ip6_addr, uint32_t lifetime_preferred, uint32_t lifetime_valid) { int r; _cleanup_address_free_ Address *addr = NULL; r = address_new(&addr); if (r < 0) return r; addr->family = AF_INET6; memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr)); addr->flags = IFA_F_NOPREFIXROUTE; addr->prefixlen = 128; addr->cinfo.ifa_prefered = lifetime_preferred; addr->cinfo.ifa_valid = lifetime_valid; log_link_info(link, "DHCPv6 address "SD_NDISC_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d", SD_NDISC_ADDRESS_FORMAT_VAL(addr->in_addr.in6), addr->prefixlen, lifetime_preferred, lifetime_valid); r = address_configure(addr, link, dhcp6_address_handler, true); if (r < 0) log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m"); return r; } static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) { int r; sd_dhcp6_lease *lease; struct in6_addr ip6_addr; uint32_t lifetime_preferred, lifetime_valid; r = sd_dhcp6_client_get_lease(client, &lease); if (r < 0) return r; sd_dhcp6_lease_reset_address_iter(lease); while (sd_dhcp6_lease_get_address(lease, &ip6_addr, &lifetime_preferred, &lifetime_valid) >= 0) { r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid); if (r < 0) return r; } return 0; } static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { int r; 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 SD_DHCP6_CLIENT_EVENT_STOP: case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE: case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX: if (sd_dhcp6_client_get_lease(client, NULL) >= 0) log_link_warning(link, "DHCPv6 lease lost"); link->dhcp6_configured = false; break; case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE: r = dhcp6_lease_address_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } /* fall through */ case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST: r = dhcp6_lease_information_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } link->dhcp6_configured = true; break; default: if (event < 0) log_link_warning_errno(link, event, "DHCPv6 error: %m"); else log_link_warning(link, "DHCPv6 unknown event: %d", event); return; } link_check_ready(link); } int dhcp6_request_address(Link *link) { int r, inf_req; bool running; assert(link); assert(link->dhcp6_client); r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req); if (r < 0) return r; if (!inf_req) return 0; r = sd_dhcp6_client_is_running(link->dhcp6_client); if (r < 0) return r; else running = !!r; if (running) { r = sd_dhcp6_client_stop(link->dhcp6_client); if (r < 0) return r; } r = sd_dhcp6_client_set_information_request(link->dhcp6_client, false); if (r < 0) return r; if (running) { r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0) return r; } return 0; } int dhcp6_configure(Link *link) { sd_dhcp6_client *client = NULL; int r; assert(link); if (link->dhcp6_client) return 0; r = sd_dhcp6_client_new(&client); if (r < 0) return r; r = sd_dhcp6_client_attach_event(client, NULL, 0); if (r < 0) goto error; r = sd_dhcp6_client_set_information_request(client, true); if (r < 0) goto error; r = sd_dhcp6_client_set_mac(client, (const uint8_t *) &link->mac, sizeof (link->mac), ARPHRD_ETHER); if (r < 0) goto error; r = sd_dhcp6_client_set_index(client, link->ifindex); if (r < 0) goto error; r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link); if (r < 0) goto error; link->dhcp6_client = client; return 0; error: sd_dhcp6_client_unref(client); return r; }