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/* $OpenBSD: rthdr.c,v 1.7 2005/03/25 13:24:12 otto 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <string.h>
#include <stdio.h>
size_t
inet6_rthdr_space(int type, int seg)
{
switch (type) {
case IPV6_RTHDR_TYPE_0:
if (seg < 1 || seg > 23)
return (0);
return (CMSG_SPACE(sizeof(struct in6_addr) * seg +
sizeof(struct ip6_rthdr0)));
default:
return (0);
}
}
struct cmsghdr *
inet6_rthdr_init(void *bp, int type)
{
struct cmsghdr *ch = (struct cmsghdr *)bp;
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);
ch->cmsg_level = IPPROTO_IPV6;
ch->cmsg_type = IPV6_RTHDR;
switch (type) {
case IPV6_RTHDR_TYPE_0:
ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0));
bzero(rthdr, sizeof(struct ip6_rthdr0));
rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
return (ch);
default:
return (NULL);
}
}
int
inet6_rthdr_add(struct cmsghdr *cmsg, const struct in6_addr *addr, u_int flags)
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch (rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (flags != IPV6_RTHDR_LOOSE)
return (-1);
if (rt0->ip6r0_segleft == 23)
return (-1);
rt0->ip6r0_segleft++;
bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
sizeof(struct in6_addr));
rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
break;
}
default:
return (-1);
}
return (0);
}
int
inet6_rthdr_lasthop(struct cmsghdr *cmsg, unsigned int flags)
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch (rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (flags != IPV6_RTHDR_LOOSE)
return (-1);
if (rt0->ip6r0_segleft > 23)
return (-1);
break;
}
default:
return (-1);
}
return (0);
}
#if 0
int
inet6_rthdr_reverse(in, out)
const struct cmsghdr *in;
struct cmsghdr *out;
{
return (-1);
}
#endif
int
inet6_rthdr_segments(const struct cmsghdr *cmsg)
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch (rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
return (-1);
return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
}
default:
return (-1);
}
}
struct in6_addr *
inet6_rthdr_getaddr(struct cmsghdr *cmsg, int index)
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch (rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
return NULL;
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (index <= 0 || naddr < index)
return NULL;
return ((struct in6_addr *)(rt0 + 1)) + index;
}
default:
return NULL;
}
}
int
inet6_rthdr_getflags(const struct cmsghdr *cmsg, int index)
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch (rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
return (-1);
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (index < 0 || naddr < index)
return (-1);
return IPV6_RTHDR_LOOSE;
}
default:
return (-1);
}
}
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