91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright (C) 2014 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <linux/if_packet.h>
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#include "dhcp6-internal.h"
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#include "dhcp6-protocol.h"
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#include "fd-util.h"
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#include "socket-util.h"
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int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
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union sockaddr_union src = {
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.in6.sin6_family = AF_INET6,
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.in6.sin6_port = htobe16(DHCP6_PORT_CLIENT),
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.in6.sin6_scope_id = index,
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};
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_cleanup_close_ int s = -1;
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int r, off = 0, on = 1;
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assert(index > 0);
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assert(local_address);
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src.in6.sin6_addr = *local_address;
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s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP);
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if (s < 0)
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return -errno;
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r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
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if (r < 0)
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return -errno;
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r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off));
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if (r < 0)
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return -errno;
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r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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if (r < 0)
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return -errno;
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r = bind(s, &src.sa, sizeof(src.in6));
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if (r < 0)
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return -errno;
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return TAKE_FD(s);
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}
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int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address,
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const void *packet, size_t len) {
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union sockaddr_union dest = {
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.in6.sin6_family = AF_INET6,
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.in6.sin6_port = htobe16(DHCP6_PORT_SERVER),
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};
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int r;
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assert(server_address);
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memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr));
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r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6));
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if (r < 0)
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return -errno;
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return 0;
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}
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