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/* $OpenBSD: rthdr.c,v 1.10 2015/01/16 16:48:51 deraadt Exp $ */
/* $KAME: rthdr.c,v 1.22 2006/02/09 08:18:58 keiichi Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 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.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <string.h>
#include <stdio.h>
/*
* RFC3542 (2292bis) API
*/
socklen_t
inet6_rth_space(int type, int segments)
{
switch (type) {
case IPV6_RTHDR_TYPE_0:
return (((segments * 2) + 1) << 3);
default:
return (0); /* type not suppported */
}
}
void *
inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments)
{
struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
struct ip6_rthdr0 *rth0;
switch (type) {
case IPV6_RTHDR_TYPE_0:
/* length validation */
if (bp_len < inet6_rth_space(IPV6_RTHDR_TYPE_0, segments))
return (NULL);
memset(bp, 0, bp_len);
rth0 = (struct ip6_rthdr0 *)rth;
rth0->ip6r0_len = segments * 2;
rth0->ip6r0_type = IPV6_RTHDR_TYPE_0;
rth0->ip6r0_segleft = 0;
rth0->ip6r0_reserved = 0;
break;
default:
return (NULL); /* type not supported */
}
return (bp);
}
int
inet6_rth_add(void *bp, const struct in6_addr *addr)
{
struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
struct ip6_rthdr0 *rth0;
struct in6_addr *nextaddr;
switch (rth->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
rth0 = (struct ip6_rthdr0 *)rth;
nextaddr = (struct in6_addr *)(rth0 + 1) + rth0->ip6r0_segleft;
*nextaddr = *addr;
rth0->ip6r0_segleft++;
break;
default:
return (-1); /* type not supported */
}
return (0);
}
int
inet6_rth_reverse(const void *in, void *out)
{
struct ip6_rthdr *rth_in = (struct ip6_rthdr *)in;
struct ip6_rthdr0 *rth0_in, *rth0_out;
int i, segments;
switch (rth_in->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
rth0_in = (struct ip6_rthdr0 *)in;
rth0_out = (struct ip6_rthdr0 *)out;
/* parameter validation XXX too paranoid? */
if (rth0_in->ip6r0_len % 2)
return (-1);
segments = rth0_in->ip6r0_len / 2;
/* we can't use memcpy here, since in and out may overlap */
memmove((void *)rth0_out, (void *)rth0_in,
((rth0_in->ip6r0_len) + 1) << 3);
rth0_out->ip6r0_segleft = segments;
/* reverse the addresses */
for (i = 0; i < segments / 2; i++) {
struct in6_addr addr_tmp, *addr1, *addr2;
addr1 = (struct in6_addr *)(rth0_out + 1) + i;
addr2 = (struct in6_addr *)(rth0_out + 1) +
(segments - i - 1);
addr_tmp = *addr1;
*addr1 = *addr2;
*addr2 = addr_tmp;
}
break;
default:
return (-1); /* type not supported */
}
return (0);
}
int
inet6_rth_segments(const void *bp)
{
struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
struct ip6_rthdr0 *rh0;
int addrs;
switch (rh->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
rh0 = (struct ip6_rthdr0 *)bp;
/*
* Validation for a type-0 routing header.
* Is this too strict?
*/
if ((rh0->ip6r0_len % 2) != 0 ||
(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
return (-1);
return (addrs);
default:
return (-1); /* unknown type */
}
}
struct in6_addr *
inet6_rth_getaddr(const void *bp, int idx)
{
struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
struct ip6_rthdr0 *rh0;
int addrs;
switch (rh->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
rh0 = (struct ip6_rthdr0 *)bp;
/*
* Validation for a type-0 routing header.
* Is this too strict?
*/
if ((rh0->ip6r0_len % 2) != 0 ||
(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
return (NULL);
if (idx < 0 || addrs <= idx)
return (NULL);
return (((struct in6_addr *)(rh0 + 1)) + idx);
default:
return (NULL); /* unknown type */
break;
}
}
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