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do not forward packets with unspecified source address (::).

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this is clarification recently made to RFC2460.  sync with kame.
This commit is contained in:
itojun 2000-08-29 09:19:43 +00:00
parent bb8d535cc5
commit 6fe60cce5f
1 changed files with 27 additions and 2 deletions
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29
sys/netinet6/ip6_mroute.c
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@ -1,5 +1,5 @@
/* $NetBSD: ip6_mroute.c,v 1.12 2000/05/19 10:39:43 itojun Exp $ */
/* $KAME: ip6_mroute.c,v 1.24 2000/05/19 07:37:05 jinmei Exp $ */
/* $NetBSD: ip6_mroute.c,v 1.13 2000/08/29 09:19:43 itojun Exp $ */
/* $KAME: ip6_mroute.c,v 1.31 2000/08/23 03:20:05 itojun Exp $ */
/*
* Copyright (C) 1998 WIDE Project.
@ -80,6 +80,8 @@
#include <netinet6/pim6.h>
#include <netinet6/pim6_var.h>
#include <net/net_osdep.h>
#define M_HASCL(m) ((m)->m_flags & M_EXT)
static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
@ -925,6 +927,7 @@ ip6_mforward(ip6, ifp, m)
register struct mbuf *mm;
int s;
mifi_t mifi;
long time_second = time.tv_sec;
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_FORWARD)
@ -942,6 +945,28 @@ ip6_mforward(ip6, ifp, m)
return 0;
ip6->ip6_hlim--;
/*
* Source address check: do not forward packets with unspecified
* source. It was discussed in July 2000, on ipngwg mailing list.
* This is rather more serious than unicast cases, because some
* MLD packets can be sent with the unspecified source address
* (although such packets must normally set 1 to the hop limit field).
*/
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
ip6stat.ip6s_cantforward++;
if (ip6_log_time + ip6_log_interval < time_second) {
ip6_log_time = time_second;
log(LOG_DEBUG,
"cannot forward "
"from %s to %s nxt %d received on %s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif));
}
return 0;
}
/*
* Determine forwarding mifs from the forwarding cache table
*/