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From: Cy Schubert <cy@FreeBSD.org>
Date: Sat, 5 Aug 2017 00:28:42 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r322073 - head/sys/contrib/ipfilter/netinet
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Author: cy
Date: Sat Aug  5 00:28:42 2017
New Revision: 322073
URL: https://svnweb.freebsd.org/changeset/base/322073

Log:
  Fix matchcing of NATed ICMP queries (resolving NATed MTU discovery).
  
  MFC after:	1 month

Modified:
  head/sys/contrib/ipfilter/netinet/ip_nat.c

Modified: head/sys/contrib/ipfilter/netinet/ip_nat.c
==============================================================================
--- head/sys/contrib/ipfilter/netinet/ip_nat.c	Fri Aug  4 23:34:39 2017	(r322072)
+++ head/sys/contrib/ipfilter/netinet/ip_nat.c	Sat Aug  5 00:28:42 2017	(r322073)
@@ -4100,13 +4100,8 @@ ipf_nat_inlookup(fin, flags, p, src, mapdst)
 		dport = htons(fin->fin_data[1]);
 		break;
 	case IPPROTO_ICMP :
-		if (flags & IPN_ICMPERR) {
-			sport = fin->fin_data[1];
-			dport = 0;
-		} else {
-			dport = fin->fin_data[1];
-			sport = 0;
-		}
+		sport = 0;
+		dport = fin->fin_data[1];
 		break;
 	default :
 		sport = 0;
@@ -4426,8 +4421,6 @@ ipf_nat_outlookup(fin, flags, p, src, dst)
 
 	ifp = fin->fin_ifp;
 	sflags = flags & IPN_TCPUDPICMP;
-	sport = 0;
-	dport = 0;
 
 	switch (p)
 	{
@@ -4437,12 +4430,12 @@ ipf_nat_outlookup(fin, flags, p, src, dst)
 		dport = htons(fin->fin_data[1]);
 		break;
 	case IPPROTO_ICMP :
-		if (flags & IPN_ICMPERR)
-			sport = fin->fin_data[1];
-		else
-			dport = fin->fin_data[1];
+		sport = 0;
+		dport = fin->fin_data[1];
 		break;
 	default :
+		sport = 0;
+		dport = 0;
 		break;
 	}