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/*
* Copyright (c) 2010-2011 Hiroki Sato. 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.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include "yp_extern.h"
int
yp_mask2prefixlen_in6(const struct sockaddr *sap, int *prefixlen)
{
int x, y = 0;
const u_char *p;
const struct in6_addr *addr;
const struct sockaddr_in6 *sain6p;
sain6p = (const struct sockaddr_in6 *)sap;
addr = &(sain6p->sin6_addr);
for (x = 0; x < (int)sizeof(addr->s6_addr); x++)
if (addr->s6_addr[x] != 0xff)
break;
if (x < (int)sizeof(addr->s6_addr))
for (y = 0; y < 8; y++)
if ((addr->s6_addr[x] & (0x80 >> y)) == 0)
break;
if (x < (int)sizeof(addr->s6_addr)) {
if (y != 0 && (addr->s6_addr[x] & (0x00ff >> y)) != 0)
return (-1);
p = (const u_char *)&addr->s6_addr[x + 1];
for (; p < addr->s6_addr + sizeof(addr->s6_addr); p++)
if (*p != 0)
return (-1);
}
*prefixlen = x * 8 + y;
return (0);
}
int
yp_prefixlen2mask_in6(struct sockaddr *sap, const int *prefixlen)
{
int i;
int len;
int bytelen, bitlen;
u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
struct in6_addr *addr;
struct sockaddr_in6 *sain6p;
len = *prefixlen;
if (0 > len || len > 128)
return (-1);
sain6p = (struct sockaddr_in6 *)sap;
memset(&sain6p->sin6_addr, 0, sizeof(sain6p->sin6_addr));
addr = &(sain6p->sin6_addr);
bytelen = len / 8;
bitlen = len % 8;
for (i = 0; i < bytelen; i++)
addr->s6_addr[i] = 0xff;
if (bitlen)
addr->s6_addr[bytelen] = maskarray[bitlen - 1];
return (0);
}
struct sockaddr *
yp_mask_in6(const struct sockaddr *addr, const struct sockaddr *mask)
{
int i;
const u_char *p, *q;
u_char *r;
const struct sockaddr_in6 *in6_addr;
const struct sockaddr_in6 *in6_mask;
struct sockaddr_in6 *in6_res;
in6_addr = (const struct sockaddr_in6 *)addr;
in6_mask = (const struct sockaddr_in6 *)mask;
if ((in6_res = malloc(sizeof(*in6_res))) == NULL)
return NULL;
memcpy(in6_res, in6_addr, sizeof(*in6_res));
p = (const u_char *)&(in6_addr->sin6_addr.s6_addr);
q = (const u_char *)&(in6_mask->sin6_addr.s6_addr);
r = (u_char *)&(in6_res->sin6_addr.s6_addr);
for (i = 0; i < (int)sizeof(in6_addr->sin6_addr.s6_addr); i++)
r[i] = p[i] & q[i];
return ((struct sockaddr *)in6_res);
}
int
yp_compare_subnet_in6(const struct sockaddr *a1, const struct sockaddr *a2)
{
const struct sockaddr_in6 *in6_a1 = (const struct sockaddr_in6 *)a1;
const struct sockaddr_in6 *in6_a2 = (const struct sockaddr_in6 *)a2;
if (debug) {
yp_error("yp_subnet_cmp_in6(): a1");
yp_debug_sa(a1);
yp_error("yp_subnet_cmp_in6(): a2");
yp_debug_sa(a2);
yp_error("yp_subnet_cmp_in6(): scope: %d - %d",
in6_a1->sin6_scope_id, in6_a2->sin6_scope_id);
}
if (in6_a1->sin6_scope_id != in6_a2->sin6_scope_id)
return (-1);
return (memcmp(in6_a1->sin6_addr.s6_addr,
in6_a2->sin6_addr.s6_addr,
sizeof(in6_a1->sin6_addr.s6_addr)));
}
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