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NetBSD/usr.sbin/pim6sd/inet6.c

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/* $NetBSD: inet6.c,v 1.1 2000/01/28 19:32:48 itojun Exp $ */
/*
* Copyright (C) 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*/
/*
* Questions concerning this software should be directed to
* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
*
*/
/*
* This program has been derived from pim6dd.
* The pim6dd program is covered by the license in the accompanying file
* named "LICENSE.pim6dd".
*/
/*
* This program has been derived from pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include "defs.h"
#include "vif.h"
#include "inet6.h"
#include <arpa/inet.h>
/* flag if address to hostname resolution should be perfomed */
int numerichost = TRUE;
int
inet6_uvif2scopeid(struct sockaddr_in6 * sa, struct uvif * v)
{
if (IN6_IS_ADDR_MULTICAST(&sa->sin6_addr))
{
if (IN6_IS_ADDR_MC_LINKLOCAL(&sa->sin6_addr))
return (v->uv_ifindex);
if (IN6_IS_ADDR_MC_SITELOCAL(&sa->sin6_addr))
return (v->uv_siteid);
}
else
{
if (IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr))
return (v->uv_ifindex);
if (IN6_IS_ADDR_SITELOCAL(&sa->sin6_addr))
return (v->uv_siteid);
}
return (0);
}
int
inet6_localif_address(struct sockaddr_in6 * sa, struct uvif * v)
{
struct phaddr *pa;
for (pa = v->uv_addrs; pa; pa = pa->pa_next)
if (inet6_equal(sa, &pa->pa_addr))
return (TRUE);
return (FALSE);
}
int
inet6_valid_host(struct sockaddr_in6 * addr)
{
if (IN6_IS_ADDR_MULTICAST(&addr->sin6_addr))
return (FALSE);
return (TRUE);
}
int
inet6_equal(struct sockaddr_in6 * sa1, struct sockaddr_in6 * sa2)
{
if (sa1->sin6_scope_id == sa2->sin6_scope_id &&
IN6_ARE_ADDR_EQUAL(&sa1->sin6_addr, &sa2->sin6_addr))
return (1);
return (0);
}
int
inet6_lessthan(struct sockaddr_in6 * sa1, struct sockaddr_in6 * sa2)
{
u_int32_t s32_1,
s32_2;
int i;
if (sa1->sin6_scope_id < sa2->sin6_scope_id)
return (1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id)
{
for (i = 0; i < 4; i++)
{
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 > s32_2)
return (0);
if (s32_1 < s32_2)
return (1);
/* otherwide, continue to compare */
}
}
return (0);
}
int
inet6_greaterthan(struct sockaddr_in6 * sa1, struct sockaddr_in6 * sa2)
{
u_int32_t s32_1,
s32_2;
int i;
if (sa1->sin6_scope_id > sa2->sin6_scope_id)
return (1);
if (sa1->sin6_scope_id == sa2->sin6_scope_id)
{
for (i = 0; i < 4; i++)
{
s32_1 = ntohl(*(u_int32_t *)&sa1->sin6_addr.s6_addr[i * 4]);
s32_2 = ntohl(*(u_int32_t *)&sa2->sin6_addr.s6_addr[i * 4]);
if (s32_1 < s32_2)
return (0);
if (s32_1 > s32_2)
return (1);
/* otherwide, continue to compare */
}
}
return (0);
}
int
inet6_match_prefix(sa1, sa2, mask)
struct sockaddr_in6 *sa1,
*sa2;
struct in6_addr *mask;
{
int i;
if (sa1->sin6_scope_id != sa2->sin6_scope_id)
return (0);
for (i = 0; i < 16; i++)
{
if ((sa1->sin6_addr.s6_addr[i] ^ sa2->sin6_addr.s6_addr[i]) &
mask->s6_addr[i])
return (0);
}
return (1);
}
char *
inet6_fmt(struct in6_addr * addr)
{
static char ip6buf[8][MAXHOSTNAMELEN];
static int ip6round = 0;
char *cp;
struct sockaddr_in6 sa6;
int flags = NI_WITHSCOPEID;
ip6round = (ip6round + 1) & 7;
cp = ip6buf[ip6round];
memset(&sa6, 0, sizeof(sa6));
sa6.sin6_len = sizeof(sa6);
sa6.sin6_family = AF_INET6;
sa6.sin6_addr = *addr;
sa6.sin6_scope_id = 0; /* XXX */
if (numerichost)
flags |= NI_NUMERICHOST;
getnameinfo((struct sockaddr *)&sa6, sa6.sin6_len, cp, MAXHOSTNAMELEN,
NULL, 0, flags);
return(cp);
}
char *
ifindex2str(int ifindex)
{
static char ifname[IFNAMSIZ];
return (if_indextoname(ifindex, ifname));
}
int
inet6_mask2plen(struct in6_addr * mask)
{
int masklen;
u_char *p = (u_char *) mask;
u_char *lim = p + 16;
for (masklen = 0; p < lim; p++)
{
switch (*p)
{
case 0xff:
masklen += 8;
break;
case 0xfe:
masklen += 7;
break;
case 0xfc:
masklen += 6;
break;
case 0xf8:
masklen += 5;
break;
case 0xf0:
masklen += 4;
break;
case 0xe0:
masklen += 3;
break;
case 0xc0:
masklen += 2;
break;
case 0x80:
masklen += 1;
break;
case 0x00:
break;
}
}
return (masklen);
}
char *
net6name(struct in6_addr * prefix, struct in6_addr * mask)
{
static char ip6buf[8][INET6_ADDRSTRLEN + 4]; /* length of addr/plen */
static int ip6round = 0;
char *cp;
ip6round = (ip6round + 1) & 7;
cp = ip6buf[ip6round];
inet_ntop(AF_INET6, prefix, cp, INET6_ADDRSTRLEN);
cp += strlen(cp);
*cp = '/';
cp++;
sprintf(cp, "%d", inet6_mask2plen(mask));
return (ip6buf[ip6round]);
}
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