/*-*- 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 "networkd-link.h" #include "network-internal.h" #include "sd-icmp6-nd.h" #include "sd-dhcp6-client.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(link, "Could not set DHCPv6 address: %s", strerror(-r)); link_enter_failed(link); } else if (r >= 0) link_rtnl_process_address(rtnl, m, link->manager); return 1; } static int dhcp6_address_update(Link *link, struct in6_addr *ip6_addr, uint8_t prefixlen, uint32_t lifetime_preferred, uint32_t lifetime_valid) { int r; _cleanup_address_free_ Address *addr = NULL; r = address_new_dynamic(&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 = prefixlen; addr->cinfo.ifa_prefered = lifetime_preferred; addr->cinfo.ifa_valid = lifetime_valid; log_link_info(link, "DHCPv6 address "SD_ICMP6_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d", SD_ICMP6_ADDRESS_FORMAT_VAL(addr->in_addr.in6), addr->prefixlen, lifetime_preferred, lifetime_valid); r = address_update(addr, link, dhcp6_address_handler); 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; uint8_t prefixlen; 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 = sd_icmp6_ra_get_prefixlen(link->icmp6_router_discovery, &ip6_addr, &prefixlen); if (r < 0 && r != -EADDRNOTAVAIL) { log_link_warning(link, "Could not get prefix information: %s", strerror(-r)); return r; } if (r == -EADDRNOTAVAIL) prefixlen = 128; r = dhcp6_address_update(link, &ip6_addr, prefixlen, 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 DHCP6_EVENT_STOP: case DHCP6_EVENT_RESEND_EXPIRE: case DHCP6_EVENT_RETRANS_MAX: log_link_debug(link, "DHCPv6 event %d", event); break; case DHCP6_EVENT_IP_ACQUIRE: r = dhcp6_lease_address_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } /* fall through */ case DHCP6_EVENT_INFORMATION_REQUEST: r = dhcp6_lease_information_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } break; default: if (event < 0) log_link_warning(link, "DHCPv6 error: %s", strerror(-event)); else log_link_warning(link, "DHCPv6 unknown event: %d", event); return; } } static int dhcp6_configure(Link *link, int event) { int r; bool information_request; assert_return(link, -EINVAL); if (link->dhcp6_client) { if (event != ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED) return 0; r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &information_request); if (r < 0) { log_link_warning(link, "Could not get DHCPv6 Information request setting: %s", strerror(-r)); link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } if (!information_request) return r; r = sd_dhcp6_client_set_information_request(link->dhcp6_client, false); if (r < 0) { log_link_warning(link, "Could not unset DHCPv6 Information request: %s", strerror(-r)); link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0) { log_link_warning(link, "Could not restart DHCPv6 after enabling Information request: %s", strerror(-r)); link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } return r; } r = sd_dhcp6_client_new(&link->dhcp6_client); if (r < 0) return r; 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; } r = sd_dhcp6_client_set_mac(link->dhcp6_client, (const uint8_t *) &link->mac, sizeof (link->mac), ARPHRD_ETHER); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } 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; } 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; } if (event == ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER) { r = sd_dhcp6_client_set_information_request(link->dhcp6_client, true); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } } r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0) link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return r; } static int dhcp6_prefix_expired(Link *link) { int r; sd_dhcp6_lease *lease; struct in6_addr *expired_prefix, ip6_addr; uint8_t expired_prefixlen; uint32_t lifetime_preferred, lifetime_valid; r = sd_icmp6_ra_get_expired_prefix(link->icmp6_router_discovery, &expired_prefix, &expired_prefixlen); if (r < 0) return r; r = sd_dhcp6_client_get_lease(link->dhcp6_client, &lease); if (r < 0) return r; log_link_info(link, "IPv6 prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d expired", SD_ICMP6_ADDRESS_FORMAT_VAL(*expired_prefix), expired_prefixlen); sd_dhcp6_lease_reset_address_iter(lease); while (sd_dhcp6_lease_get_address(lease, &ip6_addr, &lifetime_preferred, &lifetime_valid) >= 0) { r = sd_icmp6_prefix_match(expired_prefix, expired_prefixlen, &ip6_addr); if (r < 0) continue; log_link_info(link, "IPv6 prefix length updated "SD_ICMP6_ADDRESS_FORMAT_STR"/%d", SD_ICMP6_ADDRESS_FORMAT_VAL(ip6_addr), 128); dhcp6_address_update(link, &ip6_addr, 128, lifetime_preferred, lifetime_valid); } return 0; } static void icmp6_router_handler(sd_icmp6_nd *nd, 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 ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE: return; case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT: case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER: case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED: dhcp6_configure(link, event); break; case ICMP6_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED: if (!link->rtnl_extended_attrs) dhcp6_prefix_expired(link); break; default: if (event < 0) log_link_warning(link, "ICMPv6 error: %s", strerror(-event)); else log_link_warning(link, "ICMPv6 unknown event: %d", event); break; } } int icmp6_configure(Link *link) { int r; assert_return(link, -EINVAL); 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); return r; }