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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc.
* All rights reserved. Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This code is conformant to revision 7 of 2292bis. Some of these functions
* were provided (named inet6_rthdr_) in a very similar form in RFC 2292.
* The RFC 2292 variants are not supported.
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <unistd.h>
#include <errno.h>
#define MAX_RTHDR0_SEGMENTS 127
/*
* Return amount of space needed to hold N segments for the specified
* routing type. Does NOT include space for cmsghdr.
*/
socklen_t
inet6_rth_space(int type, int segments)
{
if (type != IPV6_RTHDR_TYPE_0 || segments < 0 ||
segments > MAX_RTHDR0_SEGMENTS)
return (0);
return (sizeof (struct ip6_rthdr0) +
segments * sizeof (struct in6_addr));
}
/*
* Initializes rthdr structure. Verifies the segments against the length of
* the buffer.
* Note that a routing header can only hold 127 segments since the length field
* in the header is just a byte.
*/
void *
inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments)
{
struct ip6_rthdr0 *rthdr;
if (type != IPV6_RTHDR_TYPE_0 || segments < 0 ||
segments > MAX_RTHDR0_SEGMENTS)
return (NULL);
if (bp_len < sizeof (struct ip6_rthdr0) +
segments * sizeof (struct in6_addr))
return (NULL);
rthdr = (struct ip6_rthdr0 *)bp;
rthdr->ip6r0_nxt = 0;
rthdr->ip6r0_len = (segments * 2);
rthdr->ip6r0_type = type;
rthdr->ip6r0_segleft = 0; /* Incremented by rthdr_add */
*(uint32_t *)&rthdr->ip6r0_reserved = 0;
return (bp);
}
/*
* Add one more address to the routing header. Fails when there is no more
* room.
*/
int
inet6_rth_add(void *bp, const struct in6_addr *addr)
{
struct ip6_rthdr0 *rthdr;
struct in6_addr *addrs;
rthdr = (struct ip6_rthdr0 *)bp;
if ((rthdr->ip6r0_segleft + 1) * 2 > rthdr->ip6r0_len) {
/* Not room for one more */
return (-1);
}
addrs = (struct in6_addr *)((char *)rthdr + sizeof (*rthdr));
addrs[rthdr->ip6r0_segleft++] = *addr;
return (0);
}
/*
* Reverse a source route. Both arguments can point to the same buffer.
*/
int
inet6_rth_reverse(const void *in, void *out)
{
struct ip6_rthdr0 *rtin, *rtout;
int i, segments;
struct in6_addr tmp;
struct in6_addr *rtout_addrs;
struct in6_addr *rtin_addrs;
rtin = (struct ip6_rthdr0 *)in;
rtout = (struct ip6_rthdr0 *)out;
if (rtout->ip6r0_type != 0 || rtin->ip6r0_type != 0 ||
rtout->ip6r0_len > MAX_RTHDR0_SEGMENTS * 2 ||
rtin->ip6r0_len > MAX_RTHDR0_SEGMENTS * 2 ||
rtout->ip6r0_len != rtin->ip6r0_len)
return (-1);
segments = rtin->ip6r0_len / 2;
rtout_addrs = (struct in6_addr *)((char *)rtout + sizeof (*rtout));
rtin_addrs = (struct in6_addr *)((char *)rtin + sizeof (*rtin));
for (i = 0; i < (segments + 1)/2; i++) {
tmp = rtin_addrs[i];
rtout_addrs[i] = rtin_addrs[segments - 1 - i];
rtout_addrs[segments - 1 - i] = tmp;
}
rtout->ip6r0_segleft = segments;
return (0);
}
/*
* Return the number of segments in the routing header.
*/
int
inet6_rth_segments(const void *bp)
{
struct ip6_rthdr0 *rthdr;
rthdr = (struct ip6_rthdr0 *)bp;
if (rthdr->ip6r0_type == 0) {
if (rthdr->ip6r0_len > MAX_RTHDR0_SEGMENTS * 2) {
return (-1);
} else {
return (rthdr->ip6r0_len / 2);
}
} else {
return (-1);
}
}
/*
* Return a pointer to an element in the source route.
* This uses the C convention for index [0, size-1].
*/
struct in6_addr *
inet6_rth_getaddr(const void *bp, int index)
{
struct ip6_rthdr0 *rthdr;
struct in6_addr *rv;
rthdr = (struct ip6_rthdr0 *)bp;
if (index >= rthdr->ip6r0_len/2 || index < 0)
return (NULL);
rv = (struct in6_addr *)((char *)rthdr + sizeof (*rthdr));
return (&rv[index]);
}
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