346 lines
8.5 KiB
C
346 lines
8.5 KiB
C
/* $NetBSD: rthdr.c,v 1.10 2000/07/06 03:02:22 christos Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: rthdr.c,v 1.10 2000/07/06 03:02:22 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#ifdef __weak_alias
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__weak_alias(inet6_rthdr_add,_inet6_rthdr_add)
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__weak_alias(inet6_rthdr_getaddr,_inet6_rthdr_getaddr)
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__weak_alias(inet6_rthdr_getflags,_inet6_rthdr_getflags)
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__weak_alias(inet6_rthdr_init,_inet6_rthdr_init)
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__weak_alias(inet6_rthdr_lasthop,_inet6_rthdr_lasthop)
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__weak_alias(inet6_rthdr_segments,_inet6_rthdr_segments)
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__weak_alias(inet6_rthdr_space,_inet6_rthdr_space)
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#endif
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size_t
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inet6_rthdr_space(type, seg)
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int type, seg;
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{
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switch(type) {
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case IPV6_RTHDR_TYPE_0:
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if (seg < 1 || seg > 23)
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return(0);
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return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
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+ sizeof(struct ip6_rthdr0)));
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
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#endif
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return(0);
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}
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}
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struct cmsghdr *
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inet6_rthdr_init(bp, type)
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void *bp;
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int type;
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{
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struct cmsghdr *ch;
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struct ip6_rthdr *rthdr;
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_DIAGASSERT(bp != NULL);
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ch = (struct cmsghdr *)bp;
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rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(ch);
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ch->cmsg_level = IPPROTO_IPV6;
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ch->cmsg_type = IPV6_RTHDR;
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switch(type) {
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case IPV6_RTHDR_TYPE_0:
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ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) - sizeof(struct in6_addr));
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(void)memset(rthdr, 0, sizeof(struct ip6_rthdr0));
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rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
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return(ch);
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_init: unknown type(%d)\n", type);
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#endif
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return(NULL);
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}
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}
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int
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inet6_rthdr_add(cmsg, addr, flags)
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struct cmsghdr *cmsg;
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const struct in6_addr *addr;
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u_int flags;
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{
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struct ip6_rthdr *rthdr;
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_DIAGASSERT(cmsg != NULL);
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_DIAGASSERT(addr != NULL);
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rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
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switch(rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
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if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
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#endif
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return(-1);
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}
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if (rt0->ip6r0_segleft == 23) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
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#endif
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return(-1);
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}
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if (flags == IPV6_RTHDR_STRICT) {
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int c, b;
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c = rt0->ip6r0_segleft / 8;
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b = rt0->ip6r0_segleft % 8;
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rt0->ip6r0_slmap[c] |= (1 << (7 - b));
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}
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rt0->ip6r0_segleft++;
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(void)memcpy(((caddr_t)(void *)rt0) + ((rt0->ip6r0_len + 1) << 3), addr,
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sizeof(struct in6_addr));
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rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
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cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
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break;
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}
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
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rthdr->ip6r_type);
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#endif
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return(-1);
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}
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return(0);
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}
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int
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inet6_rthdr_lasthop(cmsg, flags)
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struct cmsghdr *cmsg;
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unsigned int flags;
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{
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struct ip6_rthdr *rthdr;
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_DIAGASSERT(cmsg != NULL);
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rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
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switch(rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
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if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
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#endif
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return(-1);
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}
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if (rt0->ip6r0_segleft > 23) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
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#endif
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return(-1);
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}
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if (flags == IPV6_RTHDR_STRICT) {
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int c, b;
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c = rt0->ip6r0_segleft / 8;
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b = rt0->ip6r0_segleft % 8;
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rt0->ip6r0_slmap[c] |= (1 << (7 - b));
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}
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break;
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}
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
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rthdr->ip6r_type);
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#endif
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return(-1);
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}
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return(0);
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}
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#if 0
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int
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inet6_rthdr_reverse(in, out)
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const struct cmsghdr *in;
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struct cmsghdr *out;
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{
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
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#endif
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return -1;
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}
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#endif
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int
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inet6_rthdr_segments(cmsg)
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const struct cmsghdr *cmsg;
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{
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const struct ip6_rthdr *rthdr;
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_DIAGASSERT(cmsg != NULL);
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/*LINTED const castaway*/
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rthdr = (const struct ip6_rthdr *)(const void *)CMSG_DATA(cmsg);
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switch(rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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const struct ip6_rthdr0 *rt0 =
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(const struct ip6_rthdr0 *)(const void *)rthdr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
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rt0->ip6r0_len);
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#endif
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return -1;
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}
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return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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}
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
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rthdr->ip6r_type);
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#endif
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return -1;
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}
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}
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struct in6_addr *
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inet6_rthdr_getaddr(cmsg, index)
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struct cmsghdr *cmsg;
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int index;
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{
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struct ip6_rthdr *rthdr;
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_DIAGASSERT(cmsg != NULL);
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rthdr = (struct ip6_rthdr *)(void *)CMSG_DATA(cmsg);
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switch(rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)(void *)rthdr;
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int naddr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
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rt0->ip6r0_len);
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#endif
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return NULL;
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}
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naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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if (index <= 0 || naddr < index) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getaddr: invalid index(%d)\n", index);
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#endif
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return NULL;
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}
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return &rt0->ip6r0_addr[index - 1];
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}
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
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rthdr->ip6r_type);
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#endif
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return NULL;
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}
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}
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int
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inet6_rthdr_getflags(cmsg, index)
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const struct cmsghdr *cmsg;
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int index;
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{
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const struct ip6_rthdr *rthdr;
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_DIAGASSERT(cmsg != NULL);
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/*LINTED const castaway*/
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rthdr = (const struct ip6_rthdr *)(const void *)CMSG_DATA(cmsg);
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switch(rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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const struct ip6_rthdr0 *rt0 = (const struct ip6_rthdr0 *)
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(const void *)rthdr;
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int naddr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
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rt0->ip6r0_len);
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#endif
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return -1;
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}
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naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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if (index < 0 || naddr < index) {
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getflags: invalid index(%d)\n", index);
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#endif
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return -1;
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}
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if (rt0->ip6r0_slmap[index / 8] & (0x80 >> (index % 8)))
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return IPV6_RTHDR_STRICT;
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else
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return IPV6_RTHDR_LOOSE;
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}
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default:
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#ifdef DEBUG
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fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
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rthdr->ip6r_type);
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#endif
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return -1;
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}
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}
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