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NetBSD/lib/libc/net/rthdr.c

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/* $NetBSD: rthdr.c,v 1.10 2000/07/06 03:02:22 christos 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: rthdr.c,v 1.10 2000/07/06 03:02:22 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#ifdef __weak_alias
__weak_alias(inet6_rthdr_add,_inet6_rthdr_add)
__weak_alias(inet6_rthdr_getaddr,_inet6_rthdr_getaddr)
__weak_alias(inet6_rthdr_getflags,_inet6_rthdr_getflags)
__weak_alias(inet6_rthdr_init,_inet6_rthdr_init)
__weak_alias(inet6_rthdr_lasthop,_inet6_rthdr_lasthop)
__weak_alias(inet6_rthdr_segments,_inet6_rthdr_segments)
__weak_alias(inet6_rthdr_space,_inet6_rthdr_space)
#endif
size_t
inet6_rthdr_space(type, seg)
int type, seg;
{
switch(type) {
case IPV6_RTHDR_TYPE_0:
if (seg < 1 || seg > 23)
return(0);
return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
+ sizeof(struct ip6_rthdr0)));
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
#endif
return(0);
}
}
struct cmsghdr *
inet6_rthdr_init(bp, type)
void *bp;
int type;
{
struct cmsghdr *ch;
struct ip6_rthdr *rthdr;
_DIAGASSERT(bp != NULL);
ch = (struct cmsghdr *)bp;
rthdr = (struct ip6_rthdr *)(void *)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) - sizeof(struct in6_addr));
(void)memset(rthdr, 0, sizeof(struct ip6_rthdr0));
rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
return(ch);
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_init: unknown type(%d)\n", type);
#endif
return(NULL);
}
}
int
inet6_rthdr_add(cmsg, addr, flags)
struct cmsghdr *cmsg;
const struct in6_addr *addr;
u_int flags;
{
struct ip6_rthdr *rthdr;
_DIAGASSERT(cmsg != NULL);
_DIAGASSERT(addr != NULL);
rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
#endif
return(-1);
}
if (rt0->ip6r0_segleft == 23) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
#endif
return(-1);
}
if (flags == IPV6_RTHDR_STRICT) {
int c, b;
c = rt0->ip6r0_segleft / 8;
b = rt0->ip6r0_segleft % 8;
rt0->ip6r0_slmap[c] |= (1 << (7 - b));
}
rt0->ip6r0_segleft++;
(void)memcpy(((caddr_t)(void *)rt0) + ((rt0->ip6r0_len + 1) << 3), addr,
sizeof(struct in6_addr));
rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
break;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return(-1);
}
return(0);
}
int
inet6_rthdr_lasthop(cmsg, flags)
struct cmsghdr *cmsg;
unsigned int flags;
{
struct ip6_rthdr *rthdr;
_DIAGASSERT(cmsg != NULL);
rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
#endif
return(-1);
}
if (rt0->ip6r0_segleft > 23) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
#endif
return(-1);
}
if (flags == IPV6_RTHDR_STRICT) {
int c, b;
c = rt0->ip6r0_segleft / 8;
b = rt0->ip6r0_segleft % 8;
rt0->ip6r0_slmap[c] |= (1 << (7 - b));
}
break;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return(-1);
}
return(0);
}
#if 0
int
inet6_rthdr_reverse(in, out)
const struct cmsghdr *in;
struct cmsghdr *out;
{
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
#endif
return -1;
}
#endif
int
inet6_rthdr_segments(cmsg)
const struct cmsghdr *cmsg;
{
const struct ip6_rthdr *rthdr;
_DIAGASSERT(cmsg != NULL);
/*LINTED const castaway*/
rthdr = (const struct ip6_rthdr *)(const void *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
const struct ip6_rthdr0 *rt0 =
(const struct ip6_rthdr0 *)(const void *)rthdr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return -1;
}
return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return -1;
}
}
struct in6_addr *
inet6_rthdr_getaddr(cmsg, index)
struct cmsghdr *cmsg;
int index;
{
struct ip6_rthdr *rthdr;
_DIAGASSERT(cmsg != NULL);
rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return NULL;
}
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (index <= 0 || naddr < index) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: invalid index(%d)\n", index);
#endif
return NULL;
}
return &rt0->ip6r0_addr[index - 1];
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return NULL;
}
}
int
inet6_rthdr_getflags(cmsg, index)
const struct cmsghdr *cmsg;
int index;
{
const struct ip6_rthdr *rthdr;
_DIAGASSERT(cmsg != NULL);
/*LINTED const castaway*/
rthdr = (const struct ip6_rthdr *)(const void *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
const struct ip6_rthdr0 *rt0 = (const struct ip6_rthdr0 *)
(const void *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return -1;
}
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (index < 0 || naddr < index) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: invalid index(%d)\n", index);
#endif
return -1;
}
if (rt0->ip6r0_slmap[index / 8] & (0x80 >> (index % 8)))
return IPV6_RTHDR_STRICT;
else
return IPV6_RTHDR_LOOSE;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return -1;
}
}
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