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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Sat, 10 Feb 2018 10:13:18 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r329101 - head/sys/netinet
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Author: ae
Date: Sat Feb 10 10:13:17 2018
New Revision: 329101
URL: https://svnweb.freebsd.org/changeset/base/329101

Log:
  Reinitialize IP header length after checksum calculation. It is used
  later by TCP-MD5 code.
  
  This fixes the problem with broken TCP-MD5 over IPv4 when NIC has
  disabled TCP checksum offloading.
  
  PR:		223835
  MFC after:	1 week

Modified:
  head/sys/netinet/tcp_input.c

Modified: head/sys/netinet/tcp_input.c
==============================================================================
--- head/sys/netinet/tcp_input.c	Sat Feb 10 04:56:07 2018	(r329100)
+++ head/sys/netinet/tcp_input.c	Sat Feb 10 10:13:17 2018	(r329101)
@@ -707,6 +707,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto)
 			ip->ip_tos = iptos;
 			/* Re-initialization for later version check */
 			ip->ip_v = IPVERSION;
+			ip->ip_hl = off0 >> 2;
 		}
 
 		if (th->th_sum) {