/* Support -T l4 to limit decoding to layer 4 */

diff -u tcpdump-4.7.4-flx2.3.orig/netdissect.h tcpdump-4.7.4-flx2.3/netdissect.h
--- tcpdump-4.7.4-flx2.3.orig/netdissect.h	2015-04-22 22:32:16.000000000 +0200
+++ tcpdump-4.7.4-flx2.3/netdissect.h	2015-11-06 16:34:34.296580836 +0100
@@ -203,6 +203,7 @@
 #define PT_PGM		14	/* [UDP-encapsulated] Pragmatic General Multicast */
 #define PT_PGM_ZMTP1	15	/* ZMTP/1.0 inside PGM (native or UDP-encapsulated) */
 #define PT_LMP		16	/* Link Management Protocol */
+#define PT_L4		17	/* Do not decode above layer 4 */
 
 #ifndef min
 #define min(a,b) ((a)>(b)?(b):(a))
diff -u tcpdump-4.7.4-flx2.3.orig/tcpdump.c tcpdump-4.7.4-flx2.3/tcpdump.c
--- tcpdump-4.7.4-flx2.3.orig/tcpdump.c	2015-04-22 22:32:16.000000000 +0200
+++ tcpdump-4.7.4-flx2.3/tcpdump.c	2015-11-06 16:34:58.364716586 +0100
@@ -1361,6 +1361,8 @@
 				packettype = PT_PGM_ZMTP1;
 			else if (strcasecmp(optarg, "lmp") == 0)
 				packettype = PT_LMP;
+			else if (strcasecmp(optarg, "l4") == 0)
+				packettype = PT_L4;
 			else
 				error("unknown packet type `%s'", optarg);
 			break;