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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
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) {
union sockaddr_union src = {
.in6.sin6_family = AF_INET6,
.in6.sin6_port = htobe16(DHCP6_PORT_CLIENT),
.in6.sin6_scope_id = index,
};
_cleanup_close_ int s = -1;
int r, off = 0, on = 1;
assert(index > 0);
assert(local_address);
src.in6.sin6_addr = *local_address;
s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP);
if (s < 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 = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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;
}
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