/*** 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 <errno.h> #include <netinet/in.h> #include <netinet/ip6.h> #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <sys/types.h> #include <unistd.h> #include <linux/if_packet.h> #include "dhcp6-internal.h" #include "dhcp6-protocol.h" #include "fd-util.h" #include "socket-util.h" int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) { struct in6_pktinfo pktinfo = { .ipi6_ifindex = index, }; union sockaddr_union src = { .in6.sin6_family = AF_INET6, .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT), .in6.sin6_addr = IN6ADDR_ANY_INIT, }; _cleanup_close_ int s = -1; int r, off = 0, on = 1; if (local_address) memcpy(&src.in6.sin6_addr, local_address, sizeof(src.in6.sin6_addr)); s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP); if (s < 0) return -errno; r = setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, &pktinfo, sizeof(pktinfo)); if (r < 0) return -errno; r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)); if (r < 0) return -errno; r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off)); if (r < 0) return -errno; r = bind(s, &src.sa, sizeof(src.in6)); if (r < 0) return -errno; r = s; s = -1; return r; } int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address, const void *packet, size_t len) { union sockaddr_union dest = { .in6.sin6_family = AF_INET6, .in6.sin6_port = htobe16(DHCP6_PORT_SERVER), }; int r; assert(server_address); memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr)); r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6)); if (r < 0) return -errno; return 0; }