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/* Netfilter Driver for IPSec VPN Client
*
* Copyright(c) 2012 Samsung Electronics
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* sshinetbits.c
*
* Implementation of inet API IP address bit manipulation functions.
*
*/
#include "sshincludes.h"
#include "sshinet.h"
/* Sets all rightmost bits after keeping `keep_bits' bits on the left to
the value specified by `value'. */
void ssh_ipaddr_set_bits(SshIpAddr result, SshIpAddr ip,
unsigned int keep_bits, unsigned int value)
{
size_t len;
unsigned int i;
len = SSH_IP_IS6(ip) ? 16 : 4;
*result = *ip;
for (i = keep_bits / 8; i < len; i++)
{
if (8 * i >= keep_bits)
result->addr_data[i] = value ? 0xff : 0;
else
{
SSH_ASSERT(keep_bits - 8 * i < 8);
result->addr_data[i] &= (0xff << (8 - (keep_bits - 8 * i)));
if (value)
result->addr_data[i] |= (0xff >> (keep_bits - 8 * i));
}
}
}
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