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//==========================================================================
//
// src/sys/netinet6/dest6.c
//
//==========================================================================
// ####BSDCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
//
// Portions of this software may have been derived from FreeBSD
// or other sources, and if so are covered by the appropriate copyright
// and license included herein.
//
// Portions created by the Free Software Foundation are
// Copyright (C) 2002 Free Software Foundation, Inc.
// -------------------------------------------
// ####BSDCOPYRIGHTEND####
//==========================================================================
/* $KAME: dest6.c,v 1.33 2001/10/05 10:01:32 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/param.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 <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__OpenBSD__) && !(defined(__bsdi__) && _BSDI_VERSION >= 199802)
#include <netinet6/in6_pcb.h>
#endif
#include <netinet/icmp6.h>
#ifdef MIP6
#include <netinet6/mip6.h>
#endif
/*
* 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;
struct mbuf *n;
struct ip6_opt_home_address *haopt = NULL;
struct ip6aux *ip6a = NULL;
u_int8_t *opt;
struct ip6_hdr *ip6;
ip6 = mtod(m, struct ip6_hdr *);
/* 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;
case IP6OPT_HOME_ADDRESS:
/*
* XXX we assume that home address option appear after
* AH. if the assumption does not hold, the validation
* of AH will fail due to the address swap.
*/
#if 0
/* be picky about alignment: 8n+6 */
if ((opt - (u_int8_t *)dstopts) % 8 != 6)
goto bad;
#endif
/* HA option must appear only once */
n = ip6_addaux(m);
if (!n) {
/* not enough core */
goto bad;
}
ip6a = mtod(n, struct ip6aux *);
if ((ip6a->ip6a_flags & IP6A_HASEEN) != 0) {
/* XXX icmp6 paramprob? */
goto bad;
}
haopt = (struct ip6_opt_home_address *)opt;
optlen = haopt->ip6oh_len + 2;
/*
* don't complain even if it is larger,
* we don't support suboptions at this moment.
*/
if (optlen < sizeof(*haopt)) {
ip6stat.ip6s_toosmall++;
goto bad;
}
/* XXX check header ordering */
bcopy(haopt->ip6oh_addr, &ip6a->ip6a_home,
sizeof(ip6a->ip6a_home));
bcopy(&ip6->ip6_src, &ip6a->ip6a_careof,
sizeof(ip6a->ip6a_careof));
ip6a->ip6a_flags |= IP6A_HASEEN;
/*
* reject invalid home-addresses
*/
/* XXX linklocal-address is not supported */
if (IN6_IS_ADDR_MULTICAST(&ip6a->ip6a_home) ||
IN6_IS_ADDR_LINKLOCAL(&ip6a->ip6a_home) ||
IN6_IS_ADDR_V4MAPPED(&ip6a->ip6a_home) ||
IN6_IS_ADDR_UNSPECIFIED(&ip6a->ip6a_home) ||
IN6_IS_ADDR_LOOPBACK(&ip6a->ip6a_home)) {
ip6stat.ip6s_badscope++;
goto bad;
}
/*
* Currently, no valid sub-options are
* defined for use in a Home Address option.
*/
break;
#ifdef MIP6
case IP6OPT_BINDING_UPDATE:
case IP6OPT_BINDING_ACK:
case IP6OPT_BINDING_REQ:
if (mip6_process_destopt(m, dstopts, opt, dstoptlen)
== -1)
goto bad;
optlen = *(opt + 1) + 2;
break;
#endif /* MIP6 */
default: /* unknown option */
optlen = ip6_unknown_opt(opt, m,
opt - mtod(m, u_int8_t *));
if (optlen == -1)
return (IPPROTO_DONE);
optlen += 2;
break;
}
}
/* if haopt is non-NULL, we are sure we have seen fresh HA option */
if (haopt && ip6a &&
(ip6a->ip6a_flags & (IP6A_HASEEN | IP6A_SWAP)) == IP6A_HASEEN) {
/* XXX should we do this at all? do it now or later? */
/* XXX interaction with 2292bis IPV6_RECVDSTOPT */
/* XXX interaction with ipsec - should be okay */
/* XXX icmp6 responses is modified - which is bad */
bcopy(&ip6a->ip6a_careof, haopt->ip6oh_addr,
sizeof(haopt->ip6oh_addr));
bcopy(&ip6a->ip6a_home, &ip6->ip6_src,
sizeof(ip6->ip6_src));
#if 0
/* XXX linklocal address is (currently) not supported */
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
#endif
ip6a->ip6a_flags |= IP6A_SWAP;
}
*offp = off;
return (dstopts->ip6d_nxt);
bad:
m_freem(m);
return (IPPROTO_DONE);
}
|
