3384154590
This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.
TODO:
- The definitions of SADB_* in sys/net/pfkeyv2.h are still different
from RFC2407/IANA assignment because of binary compatibility
issue. It should be fixed under 5-CURRENT.
- ip6po_m member of struct ip6_pktopts is no longer used. But, it
is still there because of binary compatibility issue. It should
be removed under 5-CURRENT.
Reviewed by: itojun
Obtained from: KAME
MFC after: 3 weeks
223 lines
6.3 KiB
C
223 lines
6.3 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 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 "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <net/if.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
|
|
#include <netinet/icmp6.h>
|
|
|
|
static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
|
|
struct ip6_rthdr0 *));
|
|
|
|
int
|
|
route6_input(mp, offp, proto)
|
|
struct mbuf **mp;
|
|
int *offp, proto; /* proto is unused */
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *m = *mp;
|
|
struct ip6_rthdr *rh;
|
|
int off = *offp, rhlen;
|
|
struct mbuf *n;
|
|
|
|
n = ip6_findaux(m);
|
|
if (n) {
|
|
struct ip6aux *ip6a = mtod(n, struct ip6aux *);
|
|
/* XXX reject home-address option before rthdr */
|
|
if (ip6a->ip6a_flags & IP6A_SWAP) {
|
|
ip6stat.ip6s_badoptions++;
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
|
|
#else
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
|
|
if (rh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
#endif
|
|
|
|
switch (rh->ip6r_type) {
|
|
case IPV6_RTHDR_TYPE_0:
|
|
rhlen = (rh->ip6r_len + 1) << 3;
|
|
#ifndef PULLDOWN_TEST
|
|
/*
|
|
* note on option length:
|
|
* due to IP6_EXTHDR_CHECK assumption, we cannot handle
|
|
* very big routing header (max rhlen == 2048).
|
|
*/
|
|
IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
|
|
#else
|
|
/*
|
|
* note on option length:
|
|
* maximum rhlen: 2048
|
|
* max mbuf m_pulldown can handle: MCLBYTES == usually 2048
|
|
* so, here we are assuming that m_pulldown can handle
|
|
* rhlen == 2048 case. this may not be a good thing to
|
|
* assume - we may want to avoid pulling it up altogether.
|
|
*/
|
|
IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
|
|
if (rh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
#endif
|
|
if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
|
|
return(IPPROTO_DONE);
|
|
break;
|
|
default:
|
|
/* unknown routing type */
|
|
if (rh->ip6r_segleft == 0) {
|
|
rhlen = (rh->ip6r_len + 1) << 3;
|
|
break; /* Final dst. Just ignore the header. */
|
|
}
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
|
|
(caddr_t)&rh->ip6r_type - (caddr_t)ip6);
|
|
return(IPPROTO_DONE);
|
|
}
|
|
|
|
*offp += rhlen;
|
|
return(rh->ip6r_nxt);
|
|
}
|
|
|
|
/*
|
|
* Type0 routing header processing
|
|
*
|
|
* RFC2292 backward compatibility warning: no support for strict/loose bitmap,
|
|
* as it was dropped between RFC1883 and RFC2460.
|
|
*/
|
|
static int
|
|
ip6_rthdr0(m, ip6, rh0)
|
|
struct mbuf *m;
|
|
struct ip6_hdr *ip6;
|
|
struct ip6_rthdr0 *rh0;
|
|
{
|
|
int addrs, index;
|
|
struct in6_addr *nextaddr, tmpaddr;
|
|
|
|
if (rh0->ip6r0_segleft == 0)
|
|
return(0);
|
|
|
|
if (rh0->ip6r0_len % 2
|
|
#ifdef COMPAT_RFC1883
|
|
|| rh0->ip6r0_len > 46
|
|
#endif
|
|
) {
|
|
/*
|
|
* Type 0 routing header can't contain more than 23 addresses.
|
|
* RFC 2462: this limitation was removed since stict/loose
|
|
* bitmap field was deleted.
|
|
*/
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
|
|
(caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
|
|
return(-1);
|
|
}
|
|
|
|
if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
|
|
ip6stat.ip6s_badoptions++;
|
|
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
|
|
(caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
|
|
return(-1);
|
|
}
|
|
|
|
index = addrs - rh0->ip6r0_segleft;
|
|
rh0->ip6r0_segleft--;
|
|
/* note that ip6r0_addr does not exist in RFC2292bis */
|
|
nextaddr = rh0->ip6r0_addr + index;
|
|
|
|
/*
|
|
* reject invalid addresses. be proactive about malicious use of
|
|
* IPv4 mapped/compat address.
|
|
* XXX need more checks?
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
|
|
IN6_IS_ADDR_V4MAPPED(nextaddr) ||
|
|
IN6_IS_ADDR_V4COMPAT(nextaddr)) {
|
|
ip6stat.ip6s_badoptions++;
|
|
m_freem(m);
|
|
return(-1);
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
|
|
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
|
|
IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
|
|
ip6stat.ip6s_badoptions++;
|
|
m_freem(m);
|
|
return(-1);
|
|
}
|
|
|
|
/*
|
|
* Swap the IPv6 destination address and nextaddr. Forward the packet.
|
|
*/
|
|
tmpaddr = *nextaddr;
|
|
*nextaddr = ip6->ip6_dst;
|
|
if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
|
|
nextaddr->s6_addr16[1] = 0;
|
|
ip6->ip6_dst = tmpaddr;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
|
|
|
|
#ifdef COMPAT_RFC1883
|
|
if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
|
|
ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
|
|
else
|
|
ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
|
|
#else
|
|
ip6_forward(m, 1);
|
|
#endif
|
|
|
|
return(-1); /* m would be freed in ip6_forward() */
|
|
}
|