nes-proj/os/net/ipv6/ip64-addr.c

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/*
* Copyright (c) 2012, Thingsquare, http://www.thingsquare.com/.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
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#include "ipv6/ip64-addr.h"
#include <stdio.h>
#include <string.h>
#define printf(...)
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static uip_ip6addr_t ip64_prefix = {{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0}};
static uint8_t ip64_prefix_len = 96;
/*---------------------------------------------------------------------------*/
void
ip64_addr_copy4(uip_ip4addr_t *dest, const uip_ip4addr_t *src)
{
memcpy(dest, src, sizeof(uip_ip4addr_t));
}
/*---------------------------------------------------------------------------*/
void
ip64_addr_copy6(uip_ip6addr_t *dest, const uip_ip6addr_t *src)
{
memcpy(dest, src, sizeof(uip_ip6addr_t));
}
/*---------------------------------------------------------------------------*/
int
ip64_addr_4to6(const uip_ip4addr_t *ipv4addr,
uip_ip6addr_t *ipv6addr)
{
/* This function converts an IPv4 addresses into an IPv6
addresses. It returns 0 if it failed to convert the address and
non-zero if it could successfully convert the address. */
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uip_ipaddr_copy(ipv6addr, &ip64_prefix);
ipv6addr->u8[12] = ipv4addr->u8[0];
ipv6addr->u8[13] = ipv4addr->u8[1];
ipv6addr->u8[14] = ipv4addr->u8[2];
ipv6addr->u8[15] = ipv4addr->u8[3];
printf("ip64_addr_4to6: IPv6-encoded IPv4 address %d.%d.%d.%d\n",
ipv4addr->u8[0], ipv4addr->u8[1],
ipv4addr->u8[2], ipv4addr->u8[3]);
/* Conversion succeeded, we return non-zero. */
return 1;
}
/*---------------------------------------------------------------------------*/
int
ip64_addr_6to4(const uip_ip6addr_t *ipv6addr,
uip_ip4addr_t *ipv4addr)
{
/* This function converts IPv6 addresses to IPv4 addresses. It
returns 0 if it failed to convert the address and non-zero if it
could successfully convert the address. */
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if(ip64_addr_is_ip64(ipv6addr)) {
ipv4addr->u8[0] = ipv6addr->u8[12];
ipv4addr->u8[1] = ipv6addr->u8[13];
ipv4addr->u8[2] = ipv6addr->u8[14];
ipv4addr->u8[3] = ipv6addr->u8[15];
printf("ip64_addr_6to4: IPv6-encoded IPv4 address %d.%d.%d.%d\n",
ipv4addr->u8[0], ipv4addr->u8[1],
ipv4addr->u8[2], ipv4addr->u8[3]);
/* Conversion succeeded, we return non-zero. */
return 1;
}
/* We could not convert the IPv6 address, so we return 0. */
return 0;
}
/*---------------------------------------------------------------------------*/
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int
ip64_addr_is_ip64(const uip_ip6addr_t *ipv6addr)
{
return uip_ipaddr_prefixcmp(ipv6addr, &ip64_prefix, ip64_prefix_len);
}
/*---------------------------------------------------------------------------*/
void
ip64_addr_set_prefix(const uip_ip6addr_t *prefix, uint8_t prefix_len)
{
uip_ipaddr_copy(&ip64_prefix, prefix);
ip64_prefix_len = prefix_len;
}
/*---------------------------------------------------------------------------*/