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In nd6_lookup(), check if rt_llinfo is non-NULL to avoid returning an

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entry that has the LLINFO flag but is not a neighbor cache entry.

Obtained from:	KAME
MFC after:	1 week
This commit is contained in:
Hajimu UMEMOTO 2002-04-01 15:15:05 +00:00
parent dd78396c46
commit 3c404a323c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=93539
1 changed files with 9 additions and 4 deletions
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13
sys/netinet6/nd6.c
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@ -867,20 +867,25 @@ nd6_lookup(addr6, create, ifp)
rt->rt_refcnt--;
/*
* Validation for the entry.
* Note that the check for rt_llinfo is necessary because a cloned
* route from a parent route that has the L flag (e.g. the default
* route to a p2p interface) may have the flag, too, while the
* destination is not actually a neighbor.
* XXX: we can't use rt->rt_ifp to check for the interface, since
* it might be the loopback interface if the entry is for our
* own address on a non-loopback interface. Instead, we should
* use rt->rt_ifa->ifa_ifp, which would specify the REAL interface.
* use rt->rt_ifa->ifa_ifp, which would specify the REAL
* interface.
*/
if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 ||
rt->rt_gateway->sa_family != AF_LINK ||
rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL ||
(ifp && rt->rt_ifa->ifa_ifp != ifp)) {
if (create) {
log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
/* xxx more logs... kazu */
}
return(0);
return(NULL);
}
return(rt);
}
@ -933,7 +938,7 @@ nd6_is_addr_neighbor(addr, ifp)
* Even if the address matches none of our addresses, it might be
* in the neighbor cache.
*/
if (nd6_lookup(&addr->sin6_addr, 0, ifp))
if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL)
return(1);
return(0);