2020-11-09 05:23:58 +01:00
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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2014-06-19 14:38:55 +02:00
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/***
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2018-06-12 17:15:23 +02:00
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Copyright © 2014 Intel Corporation. All rights reserved.
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2014-06-19 14:38:55 +02:00
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***/
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#include <errno.h>
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2015-10-25 13:14:12 +01:00
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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2014-06-19 14:38:55 +02:00
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#include <stdio.h>
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2015-10-25 13:14:12 +01:00
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#include <string.h>
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#include <sys/types.h>
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2014-06-19 14:38:55 +02:00
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#include <unistd.h>
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2015-10-25 13:14:12 +01:00
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#include <linux/if_packet.h>
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2014-06-19 14:38:55 +02:00
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#include "dhcp6-internal.h"
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2014-06-19 14:39:23 +02:00
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#include "dhcp6-protocol.h"
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2015-10-25 13:14:12 +01:00
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#include "fd-util.h"
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#include "socket-util.h"
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2014-06-19 14:38:55 +02:00
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2020-07-02 08:49:19 +02:00
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int dhcp6_network_bind_udp_socket(int ifindex, struct in6_addr *local_address) {
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2014-06-19 14:39:23 +02:00
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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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2020-07-02 08:49:19 +02:00
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.in6.sin6_scope_id = ifindex,
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2014-06-19 14:39:23 +02:00
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};
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_cleanup_close_ int s = -1;
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2018-10-15 19:21:37 +02:00
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int r;
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2014-06-19 14:39:23 +02:00
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2020-07-02 08:49:19 +02:00
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assert(ifindex > 0);
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2015-11-16 17:43:08 +01:00
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assert(local_address);
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src.in6.sin6_addr = *local_address;
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2014-06-19 14:39:23 +02:00
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2015-11-16 19:05:27 +01:00
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s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP);
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2014-06-19 14:39:23 +02:00
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if (s < 0)
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return -errno;
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2018-10-18 19:48:18 +02:00
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r = setsockopt_int(s, IPPROTO_IPV6, IPV6_V6ONLY, true);
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2014-06-19 14:39:23 +02:00
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if (r < 0)
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2018-10-18 19:48:18 +02:00
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return r;
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2014-06-19 14:39:23 +02:00
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2018-10-18 19:48:18 +02:00
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r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, false);
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2014-06-19 14:39:23 +02:00
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if (r < 0)
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2018-10-18 19:48:18 +02:00
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return r;
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2014-06-19 14:39:23 +02:00
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2018-10-18 19:48:18 +02:00
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r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
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2015-11-16 19:05:27 +01:00
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if (r < 0)
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2018-10-18 19:48:18 +02:00
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return r;
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2015-11-16 19:05:27 +01:00
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2014-06-19 14:39:23 +02:00
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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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2018-03-22 17:04:29 +01:00
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return TAKE_FD(s);
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2014-06-19 14:39:23 +02:00
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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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