/*** 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 <netinet/icmp6.h> #include <netinet/in.h> #include <linux/if.h> #include "sd-ndisc.h" #include "networkd-link.h" static int ndisc_netlink_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); assert(link->ndisc_messages > 0); link->ndisc_messages--; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_error_errno(link, r, "Could not set NDisc route or address: %m"); link_enter_failed(link); } if (link->ndisc_messages == 0) { link->ndisc_configured = true; link_check_ready(link); } return 1; } static void ndisc_prefix_autonomous_handler(sd_ndisc *nd, const struct in6_addr *prefix, unsigned prefixlen, unsigned lifetime_preferred, unsigned lifetime_valid, void *userdata) { _cleanup_address_free_ Address *address = NULL; Link *link = userdata; usec_t time_now; int r; assert(nd); assert(link); assert(link->network); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; r = address_new(&address); if (r < 0) { log_link_error_errno(link, r, "Could not allocate address: %m"); return; } assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0); address->family = AF_INET6; address->in_addr.in6 = *prefix; if (in_addr_is_null(AF_INET6, (const union in_addr_union *) &link->network->ipv6_token) == 0) memcpy(((char *)&address->in_addr.in6) + 8, ((char *)&link->network->ipv6_token) + 8, 8); else { /* see RFC4291 section 2.5.1 */ address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0]; address->in_addr.in6.s6_addr[8] ^= 1 << 1; address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1]; address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2]; address->in_addr.in6.s6_addr[11] = 0xff; address->in_addr.in6.s6_addr[12] = 0xfe; address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3]; address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4]; address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5]; } address->prefixlen = prefixlen; address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR; address->cinfo.ifa_prefered = lifetime_preferred; address->cinfo.ifa_valid = lifetime_valid; r = address_configure(address, link, ndisc_netlink_handler, true); if (r < 0) { log_link_warning_errno(link, r, "Could not set SLAAC address: %m"); link_enter_failed(link); return; } link->ndisc_messages++; } static void ndisc_prefix_onlink_handler(sd_ndisc *nd, const struct in6_addr *prefix, unsigned prefixlen, unsigned lifetime, void *userdata) { _cleanup_route_free_ Route *route = NULL; Link *link = userdata; usec_t time_now; int r; assert(nd); assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; r = route_new(&route); if (r < 0) { log_link_error_errno(link, r, "Could not allocate route: %m"); return; } assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0); route->family = AF_INET6; route->table = RT_TABLE_MAIN; route->protocol = RTPROT_RA; route->flags = RTM_F_PREFIX; route->dst.in6 = *prefix; route->dst_prefixlen = prefixlen; route->lifetime = time_now + lifetime * USEC_PER_SEC; r = route_configure(route, link, ndisc_netlink_handler); if (r < 0) { log_link_warning_errno(link, r, "Could not set prefix route: %m"); link_enter_failed(link); return; } link->ndisc_messages++; } static void ndisc_router_handler(sd_ndisc *nd, uint8_t flags, const struct in6_addr *gateway, unsigned lifetime, int pref, void *userdata) { _cleanup_route_free_ Route *route = NULL; Link *link = userdata; usec_t time_now; int r; assert(link); assert(link->network); assert(link->manager); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; if (flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) { if (flags & ND_RA_FLAG_MANAGED) dhcp6_request_address(link); r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0 && r != -EBUSY) log_link_warning_errno(link, r, "Starting DHCPv6 client on NDisc request failed: %m"); } if (!gateway) return; r = route_new(&route); if (r < 0) { log_link_error_errno(link, r, "Could not allocate route: %m"); return; } assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0); route->family = AF_INET6; route->table = RT_TABLE_MAIN; route->protocol = RTPROT_RA; route->pref = pref; route->gw.in6 = *gateway; route->lifetime = time_now + lifetime * USEC_PER_SEC; r = route_configure(route, link, ndisc_netlink_handler); if (r < 0) { log_link_warning_errno(link, r, "Could not set default route: %m"); link_enter_failed(link); return; } link->ndisc_messages++; } static void ndisc_handler(sd_ndisc *nd, int event, void *userdata) { Link *link = userdata; int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; switch (event) { case SD_NDISC_EVENT_TIMEOUT: dhcp6_request_address(link); r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0 && r != -EBUSY) log_link_warning_errno(link, r, "Starting DHCPv6 client after NDisc timeout failed: %m"); link->ndisc_configured = true; link_check_ready(link); break; case SD_NDISC_EVENT_STOP: break; default: log_link_warning(link, "IPv6 Neighbor Discovery unknown event: %d", event); } } int ndisc_configure(Link *link) { int r; assert_return(link, -EINVAL); r = sd_ndisc_new(&link->ndisc_router_discovery); if (r < 0) return r; r = sd_ndisc_attach_event(link->ndisc_router_discovery, NULL, 0); if (r < 0) return r; r = sd_ndisc_set_mac(link->ndisc_router_discovery, &link->mac); if (r < 0) return r; r = sd_ndisc_set_index(link->ndisc_router_discovery, link->ifindex); if (r < 0) return r; r = sd_ndisc_set_callback(link->ndisc_router_discovery, ndisc_router_handler, ndisc_prefix_onlink_handler, ndisc_prefix_autonomous_handler, ndisc_handler, link); return r; }