125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/* $NetBSD: dest6.c,v 1.11 2001/11/13 00:56:56 lukem Exp $ */
|
|
/* $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun 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>
|
|
__KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.11 2001/11/13 00:56:56 lukem Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/in6_pcb.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet/icmp6.h>
|
|
|
|
/*
|
|
* Destination options header processing.
|
|
*/
|
|
int
|
|
dest6_input(mp, offp, proto)
|
|
struct mbuf **mp;
|
|
int *offp, proto;
|
|
{
|
|
struct mbuf *m = *mp;
|
|
int off = *offp, dstoptlen, optlen;
|
|
struct ip6_dest *dstopts;
|
|
u_int8_t *opt;
|
|
|
|
/* validation of the length of the header */
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
|
|
dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
|
|
#else
|
|
IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
|
|
if (dstopts == NULL)
|
|
return IPPROTO_DONE;
|
|
#endif
|
|
dstoptlen = (dstopts->ip6d_len + 1) << 3;
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
|
|
dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
|
|
#else
|
|
IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
|
|
if (dstopts == NULL)
|
|
return IPPROTO_DONE;
|
|
#endif
|
|
off += dstoptlen;
|
|
dstoptlen -= sizeof(struct ip6_dest);
|
|
opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
|
|
|
|
/* search header for all options. */
|
|
for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
|
|
if (*opt != IP6OPT_PAD1 &&
|
|
(dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
|
|
ip6stat.ip6s_toosmall++;
|
|
goto bad;
|
|
}
|
|
|
|
switch (*opt) {
|
|
case IP6OPT_PAD1:
|
|
optlen = 1;
|
|
break;
|
|
case IP6OPT_PADN:
|
|
optlen = *(opt + 1) + 2;
|
|
break;
|
|
default: /* unknown option */
|
|
optlen = ip6_unknown_opt(opt, m,
|
|
opt - mtod(m, u_int8_t *));
|
|
if (optlen == -1)
|
|
return (IPPROTO_DONE);
|
|
optlen += 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
*offp = off;
|
|
return (dstopts->ip6d_nxt);
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|