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From: Marko Zec <zec@FreeBSD.org>
Date: Tue, 1 Jul 2014 08:02:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r268083 - head/sys/netipsec
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Author: zec
Date: Tue Jul  1 08:02:25 2014
New Revision: 268083
URL: http://svnweb.freebsd.org/changeset/base/268083

Log:
  The assumption in ipsec4_process_packet() that the payload may be
  only IPv4 is wrong, so check the IP version before mangling the
  payload header.

Modified:
  head/sys/netipsec/ipsec_output.c

Modified: head/sys/netipsec/ipsec_output.c
==============================================================================
--- head/sys/netipsec/ipsec_output.c	Tue Jul  1 07:56:07 2014	(r268082)
+++ head/sys/netipsec/ipsec_output.c	Tue Jul  1 08:02:25 2014	(r268083)
@@ -498,9 +498,11 @@ ipsec4_process_packet(
 				goto bad;
 			}
 			ip = mtod(m, struct ip *);
-			ip->ip_len = htons(m->m_pkthdr.len);
-			ip->ip_sum = 0;
-			ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
+			if (ip->ip_v == IPVERSION) {
+				ip->ip_len = htons(m->m_pkthdr.len);
+				ip->ip_sum = 0;
+				ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
+			}
 
 			/* Encapsulate the packet */
 			error = ipip_output(m, isr, &mp, 0, 0);