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From: Qing Li <qingli@FreeBSD.org>
Date: Sat, 5 Sep 2009 16:50:55 +0000 (UTC)
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Subject: svn commit: r196865 - head/sys/netinet6
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Author: qingli
Date: Sat Sep  5 16:50:55 2009
New Revision: 196865
URL: http://svn.freebsd.org/changeset/base/196865

Log:
  This patch fixes an address scope violation. Considering the
  scenario where an anycast address is assigned on one interface,
  and a global address with the same scope is assigned on another
  interface. In other words, the interface owns the anycast
  address has only the link-local address as one other address.
  Without this patch, "ping6" the anycast address from another
  station will observe the source address of the returned ICMP6
  echo reply has the link-local address, not the global address
  that exists on the other interface in the same node.
  
  Reviewed by:	bz
  MFC after:	immediately

Modified:
  head/sys/netinet6/icmp6.c

Modified: head/sys/netinet6/icmp6.c
==============================================================================
--- head/sys/netinet6/icmp6.c	Sat Sep  5 16:43:16 2009	(r196864)
+++ head/sys/netinet6/icmp6.c	Sat Sep  5 16:50:55 2009	(r196865)
@@ -2170,6 +2170,10 @@ icmp6_reflect(struct mbuf *m, size_t off
 		}
 	}
 
+	if ((srcp != NULL) && 
+	    (in6_addrscope(srcp) != in6_addrscope(&ip6->ip6_src)))
+		srcp = NULL;
+
 	if (srcp == NULL) {
 		int e;
 		struct sockaddr_in6 sin6;