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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Sat, 28 Nov 2009 21:40:57 +0000 (UTC)
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Subject: svn commit: r199896 - head/sys/netipsec
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Author: bz
Date: Sat Nov 28 21:40:57 2009
New Revision: 199896
URL: http://svn.freebsd.org/changeset/base/199896

Log:
  Directly send data uncompressed if the packet payload size is lower than
  the compression algorithm threshold.
  
  MFC after:	6 days

Modified:
  head/sys/netipsec/xform_ipcomp.c

Modified: head/sys/netipsec/xform_ipcomp.c
==============================================================================
--- head/sys/netipsec/xform_ipcomp.c	Sat Nov 28 21:08:19 2009	(r199895)
+++ head/sys/netipsec/xform_ipcomp.c	Sat Nov 28 21:40:57 2009	(r199896)
@@ -343,6 +343,17 @@ ipcomp_output(
 	ipcompx = sav->tdb_compalgxform;
 	IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
 
+	/*
+	 * Do not touch the packet in case our payload to compress
+	 * is lower than the minimal threshold of the compression
+	 * alogrithm.  We will just send out the data uncompressed.
+	 * See RFC 3173, 2.2. Non-Expansion Policy.
+	 */
+	if (m->m_pkthdr.len <= ipcompx->minlen) {
+		/* XXX-BZ V_ipcompstat.threshold++; */
+		return ipsec_process_done(m, isr);
+	}
+
 	ralen = m->m_pkthdr.len - skip;	/* Raw payload length before comp. */
 	hlen = IPCOMP_HLENGTH;