diff --git a/CHANGES b/CHANGES
index fd6b69f099..2e4a2be3af 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,16 @@
 
+2.1-218 | 2012-12-10 14:45:04 -0800
+
+  * Add GPRS Tunnelling Protocol (GTPv1) decapsulation. This currently
+    supports automatic decapsulation of GTP-U packets on UDP port 2152.
+    The GTPv1 headers for such tunnels can be inspected by handling
+    the "gtpv1_g_pdu_packet" event, which has a parameter of type
+    "gtpv1_hdr". Addresses #690. (Jon Siwek; derived from patch by
+    Carsten Langer)
+
+  * Change BinPAC exceptions in AYIYA/GTP analyzers to do
+    "protocol_violation". (Jon Siwek)
+
 2.1-212 | 2012-12-07 19:42:03 -0800
 
   * Changing the HTTP parser to accept request methods in alignment
diff --git a/NEWS b/NEWS
index 63c4d5d6f7..f3fe143362 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,8 @@ Bro 2.2
 New Functionality
 ~~~~~~~~~~~~~~~~~
 
+- GPRS Tunnelling Protocol (GTPv1) decapsulation.
+
 - GridFTP support. TODO: Extend.
 
 - ssl.log now also records the subject client and issuer certificates.
diff --git a/VERSION b/VERSION
index ae0289baaf..addd00e2de 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1-212
+2.1-218
diff --git a/scripts/base/frameworks/tunnels/main.bro b/scripts/base/frameworks/tunnels/main.bro
index 0861559558..a3db7061d3 100644
--- a/scripts/base/frameworks/tunnels/main.bro
+++ b/scripts/base/frameworks/tunnels/main.bro
@@ -88,7 +88,10 @@ redef dpd_config += { [ANALYZER_AYIYA] = [$ports = ayiya_ports] };
 const teredo_ports = { 3544/udp };
 redef dpd_config += { [ANALYZER_TEREDO] = [$ports = teredo_ports] };
 
-redef likely_server_ports += { ayiya_ports, teredo_ports };
+const gtpv1u_ports = { 2152/udp };
+redef dpd_config += { [ANALYZER_GTPV1] = [$ports = gtpv1u_ports] };
+
+redef likely_server_ports += { ayiya_ports, teredo_ports, gtpv1u_ports };
 
 event bro_init() &priority=5
 	{
diff --git a/scripts/base/init-bare.bro b/scripts/base/init-bare.bro
index df3596d31e..e5365a9428 100644
--- a/scripts/base/init-bare.bro
+++ b/scripts/base/init-bare.bro
@@ -1450,6 +1450,44 @@ type teredo_hdr: record {
 	hdr:    pkt_hdr;                 ##< IPv6 and transport protocol headers.
 };
 
+## A GTPv1 (GPRS Tunneling Protocol) header.
+type gtpv1_hdr: record {
+	## The 3-bit version field, which for GTPv1 should be 1.
+	version:   count;
+	## Protocol Type value differentiates GTP (value 1) from GTP' (value 0).
+	pt_flag:   bool;
+	## Reserved field, should be 0.
+	rsv:       bool;
+	## Extension Header flag.  When 0, the *next_type* field may or may not
+	## be present, but shouldn't be meaningful.  When 1, *next_type* is
+	## present and meaningful.
+	e_flag:    bool;
+	## Sequence Number flag.  When 0, the *seq* field may or may not
+	## be present, but shouldn't be meaningful.  When 1, *seq* is
+	## present and meaningful.
+	s_flag:    bool;
+	## N-PDU flag.  When 0, the *n_pdu* field may or may not
+	## be present, but shouldn't be meaningful.  When 1, *n_pdu* is
+	## present and meaningful.
+	pn_flag:   bool;
+	## Message Type.  A value of 255 indicates user-plane data is encapsulated.
+	msg_type:  count;
+	## Length of the GTP packet payload (the rest of the packet following the
+	## mandatory 8-byte GTP header).
+	length:    count;
+	## Tunnel Endpoint Identifier.  Unambiguously identifies a tunnel endpoint
+	## in receiving GTP-U or GTP-C protocol entity.
+	teid:      count;
+	## Sequence Number.  Set if any *e_flag*, *s_flag*, or *pn_flag* field is
+	## set.
+	seq:       count &optional;
+	## N-PDU Number.  Set if any *e_flag*, *s_flag*, or *pn_flag* field is set.
+	n_pdu:     count &optional;
+	## Next Extension Header Type.  Set if any *e_flag*, *s_flag*, or *pn_flag*
+	## field is set.
+	next_type: count &optional;
+};
+
 ## Definition of "secondary filters". A secondary filter is a BPF filter given as
 ## index in this table. For each such filter, the corresponding event is raised for
 ## all matching packets.
@@ -2786,6 +2824,9 @@ export {
 	## Toggle whether to do IPv6-in-Teredo decapsulation.
 	const enable_teredo = T &redef;
 
+	## Toggle whether to do GTPv1 decapsulation.
+	const enable_gtpv1 = T &redef;
+
 	## With this option set, the Teredo analysis will first check to see if
 	## other protocol analyzers have confirmed that they think they're
 	## parsing the right protocol and only continue with Teredo tunnel
@@ -2802,6 +2843,15 @@ export {
 	## :bro:see:`Tunnel::yielding_teredo_decapsulation`.
 	const delay_teredo_confirmation = T &redef;
 
+	## With this set, the GTP analyzer waits until the most-recent upflow
+	## and downflow packets are a valid GTPv1 encapsulation before
+	## issuing :bro:see:`protocol_confirmation`.  If it's false, the
+	## first occurence of a packet with valid GTPv1 encapsulation causes
+	## confirmation.  Since the same inner connection can be carried
+	## differing outer upflow/downflow connections, setting to false
+	## may work better.
+	const delay_gtp_confirmation = F &redef;
+
 	## How often to cleanup internal state for inactive IP tunnels.
 	const ip_tunnel_timeout = 24hrs &redef;
 } # end export
diff --git a/src/AYIYA.cc b/src/AYIYA.cc
index c525a73b6c..79fa44e743 100644
--- a/src/AYIYA.cc
+++ b/src/AYIYA.cc
@@ -20,5 +20,13 @@ void AYIYA_Analyzer::Done()
 void AYIYA_Analyzer::DeliverPacket(int len, const u_char* data, bool orig, int seq, const IP_Hdr* ip, int caplen)
 	{
 	Analyzer::DeliverPacket(len, data, orig, seq, ip, caplen);
-	interp->NewData(orig, data, data + len);
+
+	try
+		{
+		interp->NewData(orig, data, data + len);
+		}
+	catch ( const binpac::Exception& e )
+		{
+		ProtocolViolation(fmt("Binpac exception: %s", e.c_msg()));
+		}
 	}
diff --git a/src/Analyzer.cc b/src/Analyzer.cc
index 0a5188d76c..15926dfa2a 100644
--- a/src/Analyzer.cc
+++ b/src/Analyzer.cc
@@ -41,6 +41,7 @@
 #include "Syslog-binpac.h"
 #include "Teredo.h"
 #include "ConnSizeAnalyzer.h"
+#include "GTPv1.h"
 
 // Keep same order here as in AnalyzerTag definition!
 const Analyzer::Config Analyzer::analyzer_configs[] = {
@@ -143,6 +144,9 @@ const Analyzer::Config Analyzer::analyzer_configs[] = {
 	{ AnalyzerTag::Teredo, "TEREDO",
 		Teredo_Analyzer::InstantiateAnalyzer,
 		Teredo_Analyzer::Available, 0, false },
+	{ AnalyzerTag::GTPv1, "GTPV1",
+		GTPv1_Analyzer::InstantiateAnalyzer,
+		GTPv1_Analyzer::Available, 0, false },
 
 	{ AnalyzerTag::File, "FILE", File_Analyzer::InstantiateAnalyzer,
 		File_Analyzer::Available, 0, false },
diff --git a/src/AnalyzerTags.h b/src/AnalyzerTags.h
index 4dbbcd7499..38e47cf8fc 100644
--- a/src/AnalyzerTags.h
+++ b/src/AnalyzerTags.h
@@ -38,6 +38,7 @@ namespace AnalyzerTag {
 		AYIYA,
 		SOCKS,
 		Teredo,
+		GTPv1,
 
 		// Other
 		File, Backdoor, InterConn, SteppingStone, TCPStats,
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6867b9639c..d304604dcd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -203,6 +203,8 @@ binpac_target(dns.pac
     dns-protocol.pac dns-analyzer.pac)
 binpac_target(dns_tcp.pac
     dns.pac)
+binpac_target(gtpv1.pac
+    gtpv1-protocol.pac gtpv1-analyzer.pac)
 binpac_target(http.pac
     http-protocol.pac http-analyzer.pac)
 binpac_target(ncp.pac)
@@ -332,6 +334,7 @@ set(bro_SRCS
     Frame.cc
     Func.cc
     Gnutella.cc
+    GTPv1.cc
     HTTP.cc
     HTTP-binpac.cc
     Hash.cc
diff --git a/src/GTPv1.cc b/src/GTPv1.cc
new file mode 100644
index 0000000000..68b6f30a0c
--- /dev/null
+++ b/src/GTPv1.cc
@@ -0,0 +1,31 @@
+#include "GTPv1.h"
+
+GTPv1_Analyzer::GTPv1_Analyzer(Connection* conn)
+: Analyzer(AnalyzerTag::GTPv1, conn)
+	{
+	interp = new binpac::GTPv1::GTPv1_Conn(this);
+	}
+
+GTPv1_Analyzer::~GTPv1_Analyzer()
+	{
+	delete interp;
+	}
+
+void GTPv1_Analyzer::Done()
+	{
+	Analyzer::Done();
+	Event(udp_session_done);
+	}
+
+void GTPv1_Analyzer::DeliverPacket(int len, const u_char* data, bool orig, int seq, const IP_Hdr* ip, int caplen)
+	{
+	Analyzer::DeliverPacket(len, data, orig, seq, ip, caplen);
+	try
+		{
+		interp->NewData(orig, data, data + len);
+		}
+	catch ( const binpac::Exception& e )
+		{
+		ProtocolViolation(fmt("Binpac exception: %s", e.c_msg()));
+		}
+	}
diff --git a/src/GTPv1.h b/src/GTPv1.h
new file mode 100644
index 0000000000..e111158833
--- /dev/null
+++ b/src/GTPv1.h
@@ -0,0 +1,29 @@
+#ifndef GTPv1_h
+#define GTPv1_h
+
+#include "gtpv1_pac.h"
+
+class GTPv1_Analyzer : public Analyzer {
+public:
+	GTPv1_Analyzer(Connection* conn);
+	virtual ~GTPv1_Analyzer();
+
+	virtual void Done();
+	virtual void DeliverPacket(int len, const u_char* data, bool orig,
+					int seq, const IP_Hdr* ip, int caplen);
+
+	static Analyzer* InstantiateAnalyzer(Connection* conn)
+		{ return new GTPv1_Analyzer(conn); }
+
+	static bool Available()
+		{ return BifConst::Tunnel::enable_gtpv1 &&
+		         BifConst::Tunnel::max_depth > 0; }
+
+protected:
+	friend class AnalyzerTimer;
+	void ExpireTimer(double t);
+
+	binpac::GTPv1::GTPv1_Conn* interp;
+};
+
+#endif
diff --git a/src/NetVar.cc b/src/NetVar.cc
index 248ae15e1a..1783130f34 100644
--- a/src/NetVar.cc
+++ b/src/NetVar.cc
@@ -5,6 +5,7 @@
 #include "Var.h"
 #include "NetVar.h"
 
+RecordType* gtpv1_hdr_type;
 RecordType* conn_id;
 RecordType* endpoint;
 RecordType* endpoint_stats;
@@ -308,6 +309,7 @@ void init_net_var()
 #include "input.bif.netvar_init"
 #include "reporter.bif.netvar_init"
 
+	gtpv1_hdr_type = internal_type("gtpv1_hdr")->AsRecordType();
 	conn_id = internal_type("conn_id")->AsRecordType();
 	endpoint = internal_type("endpoint")->AsRecordType();
 	endpoint_stats = internal_type("endpoint_stats")->AsRecordType();
diff --git a/src/NetVar.h b/src/NetVar.h
index 2561fa0ad9..4bb2d2a7f9 100644
--- a/src/NetVar.h
+++ b/src/NetVar.h
@@ -8,6 +8,7 @@
 #include "EventRegistry.h"
 #include "Stats.h"
 
+extern RecordType* gtpv1_hdr_type;
 extern RecordType* conn_id;
 extern RecordType* endpoint;
 extern RecordType* endpoint_stats;
diff --git a/src/const.bif b/src/const.bif
index 7373403c11..ea7dc03817 100644
--- a/src/const.bif
+++ b/src/const.bif
@@ -15,8 +15,10 @@ const Tunnel::max_depth: count;
 const Tunnel::enable_ip: bool;
 const Tunnel::enable_ayiya: bool;
 const Tunnel::enable_teredo: bool;
+const Tunnel::enable_gtpv1: bool;
 const Tunnel::yielding_teredo_decapsulation: bool;
 const Tunnel::delay_teredo_confirmation: bool;
+const Tunnel::delay_gtp_confirmation: bool;
 const Tunnel::ip_tunnel_timeout: interval;
 
 const Threading::heartbeat_interval: interval;
diff --git a/src/event.bif b/src/event.bif
index b965c26ae9..8dd940f38b 100644
--- a/src/event.bif
+++ b/src/event.bif
@@ -577,6 +577,19 @@ event teredo_origin_indication%(outer: connection, inner: teredo_hdr%);
 ##    it may become particularly expensive for real-time analysis.
 event teredo_bubble%(outer: connection, inner: teredo_hdr%);
 
+## Generated for GTPv1 G-PDU packets.  That is, packets with a UDP payload
+## that includes a GTP header followed by an IPv4 or IPv6 packet.
+##
+## outer: The GTP outer tunnel connection.
+##
+## inner_gtp: The GTP header.
+##
+## inner_ip: The inner IP and transport layer packet headers.
+##
+## .. note:: Since this event may be raised on a per-packet basis, handling
+##    it may become particularly expensive for real-time analysis.
+event gtpv1_g_pdu_packet%(outer: connection, inner_gtp: gtpv1_hdr, inner_ip: pkt_hdr%);
+
 ## Generated for every packet that has a non-empty transport-layer payload.
 ## This is a very low-level and expensive event that should be avoided when
 ## at all possible.  It's usually infeasible to handle when processing even
@@ -858,7 +871,7 @@ event udp_contents%(u: connection, is_orig: bool, contents: string%);
 ## Generated when a UDP session for a supported protocol has finished. Some of
 ## Bro's application-layer UDP analyzers flag the end of a session by raising
 ## this event. Currently, the analyzers for DNS, NTP, Netbios, Syslog, AYIYA,
-## and Teredo support this.
+## Teredo, and GTPv1 support this.
 ##
 ## u: The connection record for the corresponding UDP flow.
 ##
diff --git a/src/gtpv1-analyzer.pac b/src/gtpv1-analyzer.pac
new file mode 100644
index 0000000000..08fbdef74a
--- /dev/null
+++ b/src/gtpv1-analyzer.pac
@@ -0,0 +1,161 @@
+
+connection GTPv1_Conn(bro_analyzer: BroAnalyzer)
+	{
+	upflow = GTPv1_Flow(true);
+	downflow = GTPv1_Flow(false);
+
+	%member{
+		bool valid_orig;
+		bool valid_resp;
+	%}
+
+	%init{
+		valid_orig = valid_resp = false;
+	%}
+
+	function valid(orig: bool): bool
+		%{
+		return orig ? valid_orig : valid_resp;
+		%}
+
+	function set_valid(orig: bool, val: bool): void
+		%{
+		if ( orig )
+			valid_orig = val;
+		else
+			valid_resp = val;
+		%}
+	}
+
+%code{
+inline void violate(const char* r, const BroAnalyzer& a, const bytestring& p)
+	{
+	a->ProtocolViolation(r, (const char*) p.data(), p.length());
+	}
+%}
+
+flow GTPv1_Flow(is_orig: bool)
+	{
+	datagram = GTPv1_Header withcontext(connection, this);
+
+	function process_gtpv1(pdu: GTPv1_Header): bool
+		%{
+		BroAnalyzer a = connection()->bro_analyzer();
+		Connection *c = a->Conn();
+		const EncapsulationStack* e = c->GetEncapsulation();
+
+		connection()->set_valid(is_orig(), false);
+
+		if ( e && e->Depth() >= BifConst::Tunnel::max_depth )
+			{
+			reporter->Weird(c, "tunnel_depth");
+			return false;
+			}
+
+		if ( e && e->LastType() == BifEnum::Tunnel::GTPv1 )
+			{
+			// GTP is never tunneled in GTP so, this must be a regular packet
+			violate("GTP-in-GTP", a, ${pdu.packet});
+			return false;
+			}
+
+		if ( ${pdu.version} != 1 )
+			{
+			// Only know of GTPv1 with Version == 1
+			violate("GTPv1 bad Version", a, ${pdu.packet});
+			return false;
+			}
+
+		if ( ! ${pdu.pt_flag} )
+			{
+			// Not interested in GTP'
+			return false;
+			}
+
+		if ( ${pdu.e_flag} )
+			{
+			// TODO: can't currently parse past extension headers
+			return false;
+			}
+
+		if ( ${pdu.msg_type} != 0xff )
+			{
+			// Only interested in decapsulating user plane data beyond here.
+			return false;
+			}
+
+		if ( ${pdu.packet}.length() < (int)sizeof(struct ip) )
+			{
+			violate("Truncated GTPv1", a, ${pdu.packet});
+			return false;
+			}
+
+		const struct ip* ip = (const struct ip*) ${pdu.packet}.data();
+
+		if ( ip->ip_v != 4 && ip->ip_v != 6 )
+			{
+			violate("non-IP packet in GTPv1", a, ${pdu.packet});
+			return false;
+			}
+
+		IP_Hdr* inner = 0;
+		int result = sessions->ParseIPPacket(${pdu.packet}.length(),
+		     ${pdu.packet}.data(), ip->ip_v == 6 ? IPPROTO_IPV6 : IPPROTO_IPV4,
+		     inner);
+
+		if ( result == 0 )
+			{
+			connection()->set_valid(is_orig(), true);
+
+			if ( (! BifConst::Tunnel::delay_gtp_confirmation) ||
+			     (connection()->valid(true) && connection()->valid(false)) )
+				a->ProtocolConfirmation();
+			}
+
+		else if ( result < 0 )
+			violate("Truncated GTPv1", a, ${pdu.packet});
+
+		else
+			violate("GTPv1 payload length", a, ${pdu.packet});
+
+		if ( result != 0 )
+			{
+			delete inner;
+			return false;
+			}
+
+		if ( ::gtpv1_g_pdu_packet )
+			{
+			RecordVal* rv = new RecordVal(gtpv1_hdr_type);
+
+			rv->Assign(0, new Val(${pdu.version}, TYPE_COUNT));
+			rv->Assign(1, new Val(${pdu.pt_flag}, TYPE_BOOL));
+			rv->Assign(2, new Val(${pdu.rsv}, TYPE_BOOL));
+			rv->Assign(3, new Val(${pdu.e_flag}, TYPE_BOOL));
+			rv->Assign(4, new Val(${pdu.s_flag}, TYPE_BOOL));
+			rv->Assign(5, new Val(${pdu.pn_flag}, TYPE_BOOL));
+			rv->Assign(6, new Val(${pdu.msg_type}, TYPE_COUNT));
+			rv->Assign(7, new Val(ntohs(${pdu.length}), TYPE_COUNT));
+			rv->Assign(8, new Val(ntohl(${pdu.teid}), TYPE_COUNT));
+
+			if ( ${pdu.has_opt} )
+				{
+				rv->Assign(9, new Val(ntohs(${pdu.opt_hdr.seq}), TYPE_COUNT));
+				rv->Assign(10, new Val(${pdu.opt_hdr.n_pdu}, TYPE_COUNT));
+				rv->Assign(11, new Val(${pdu.opt_hdr.next_type}, TYPE_COUNT));
+				}
+
+			BifEvent::generate_gtpv1_g_pdu_packet(a, c, rv,
+			                                      inner->BuildPktHdrVal());
+			}
+
+		EncapsulatingConn ec(c, BifEnum::Tunnel::GTPv1);
+
+		sessions->DoNextInnerPacket(network_time(), 0, inner, e, ec);
+
+		return (result == 0) ? true : false;
+		%}
+
+	};
+
+refine typeattr GTPv1_Header += &let { proc_gtpv1 = $context.flow.process_gtpv1(this); };
diff --git a/src/gtpv1-protocol.pac b/src/gtpv1-protocol.pac
new file mode 100644
index 0000000000..5bf31a48ee
--- /dev/null
+++ b/src/gtpv1-protocol.pac
@@ -0,0 +1,27 @@
+
+type GTPv1_Header = record {
+	flags:     uint8;
+	msg_type:  uint8;
+	length:    uint16;
+	teid:      uint32;
+	opt:       case has_opt of {
+		true  -> opt_hdr: GTPv1_Opt_Header;
+		false -> no_opt:  empty;
+	} &requires(has_opt);
+	packet:    bytestring &restofdata;
+
+} &let {
+	version:  uint8 = (flags & 0xE0) >> 5;
+	pt_flag:  bool  = flags & 0x10;
+	rsv:      bool  = flags & 0x08;
+	e_flag:   bool  = flags & 0x04;
+	s_flag:   bool  = flags & 0x02;
+	pn_flag:  bool  = flags & 0x01;
+	has_opt:  bool  = flags & 0x07;
+} &byteorder = littleendian;
+
+type GTPv1_Opt_Header = record {
+	seq:       uint16;
+	n_pdu:     uint8;
+	next_type: uint8;
+}
diff --git a/src/gtpv1.pac b/src/gtpv1.pac
new file mode 100644
index 0000000000..d155ecfd67
--- /dev/null
+++ b/src/gtpv1.pac
@@ -0,0 +1,10 @@
+%include binpac.pac
+%include bro.pac
+
+analyzer GTPv1 withcontext {
+	connection:	GTPv1_Conn;
+	flow:		GTPv1_Flow;
+};
+
+%include gtpv1-protocol.pac
+%include gtpv1-analyzer.pac
diff --git a/src/types.bif b/src/types.bif
index 34e17ce28e..888310419c 100644
--- a/src/types.bif
+++ b/src/types.bif
@@ -184,6 +184,7 @@ enum Type %{
 	AYIYA,
 	TEREDO,
 	SOCKS,
+	GTPv1,
 %}
 
 type EncapsulatingConn: record;
diff --git a/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/conn.log b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/conn.log
new file mode 100644
index 0000000000..e2861b4ae1
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/conn.log
@@ -0,0 +1,12 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-03-55
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458850.321642	arKYeMETxOg	10.131.17.170	51803	173.199.115.168	80	tcp	http	0.257902	1138	63424	S3	-	0	ShADadf	29	2310	49	65396	UWkUyAuUGXf,k6kgXLOoSKl
+1333458850.325787	k6kgXLOoSKl	207.233.125.40	2152	167.55.105.244	2152	udp	gtpv1	0.251127	65788	0	S0	-	0	D	49	67160	0	0	(empty)
+1333458850.321642	UWkUyAuUGXf	167.55.105.244	5906	207.233.125.40	2152	udp	gtpv1	0.257902	2542	0	S0	-	0	D	29	3354	0	0	(empty)
+#close	2012-10-19-17-03-55
diff --git a/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/http.log b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/http.log
new file mode 100644
index 0000000000..66b17e1200
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/http.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	http
+#open	2012-10-19-17-03-55
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	trans_depth	method	host	uri	referrer	user_agent	request_body_len	response_body_len	status_code	status_msg	info_code	info_msg	filename	tags	username	password	proxied	mime_type	md5	extraction_file
+#types	time	string	addr	port	addr	port	count	string	string	string	string	string	count	count	count	string	count	string	string	table[enum]	string	string	table[string]	string	string	file
+1333458850.340368	arKYeMETxOg	10.131.17.170	51803	173.199.115.168	80	1	GET	cdn.epicgameads.com	/ads/flash/728x90_nx8com.swf?clickTAG=http://www.epicgameads.com/ads/bannerclickPage.php?id=e3ubwU6IF&pd=1&adid=0&icpc=1&axid=0&uctt=1&channel=4&cac=1&t=728x90&cb=1333458879	http://www.epicgameads.com/ads/banneriframe.php?id=e3ubwU6IF&t=728x90&channel=4&cb=1333458905296	Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)	0	31461	200	OK	-	-	-	(empty)	-	-	-	application/x-shockwave-flash	-	-
+1333458850.399501	arKYeMETxOg	10.131.17.170	51803	173.199.115.168	80	2	GET	cdn.epicgameads.com	/ads/flash/728x90_nx8com.swf?clickTAG=http://www.epicgameads.com/ads/bannerclickPage.php?id=e3ubwU6IF&pd=1&adid=0&icpc=1&axid=0&uctt=1&channel=0&cac=1&t=728x90&cb=1333458881	http://www.epicgameads.com/ads/banneriframe.php?id=e3ubwU6IF&t=728x90&cb=1333458920207	Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)	0	31461	200	OK	-	-	-	(empty)	-	-	-	application/x-shockwave-flash	-	-
+#close	2012-10-19-17-03-55
diff --git a/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/tunnel.log
new file mode 100644
index 0000000000..233ad1c850
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.different_dl_and_ul/tunnel.log
@@ -0,0 +1,13 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-17-03-55
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458850.321642	UWkUyAuUGXf	167.55.105.244	5906	207.233.125.40	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.325787	k6kgXLOoSKl	207.233.125.40	2152	167.55.105.244	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.579544	k6kgXLOoSKl	207.233.125.40	2152	167.55.105.244	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.579544	UWkUyAuUGXf	167.55.105.244	5906	207.233.125.40	2152	Tunnel::GTPv1	Tunnel::CLOSE
+#close	2012-10-19-17-03-55
diff --git a/testing/btest/Baseline/core.tunnels.gtp.false_gtp/conn.log b/testing/btest/Baseline/core.tunnels.gtp.false_gtp/conn.log
new file mode 100644
index 0000000000..1234558195
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.false_gtp/conn.log
@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-07-44
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458871.219794	UWkUyAuUGXf	10.131.24.6	2152	195.178.38.3	53	udp	dns	-	-	-	S0	-	0	D	1	64	0	0	(empty)
+#close	2012-10-19-17-07-44
diff --git a/testing/btest/Baseline/core.tunnels.gtp.false_gtp/dns.log b/testing/btest/Baseline/core.tunnels.gtp.false_gtp/dns.log
new file mode 100644
index 0000000000..a293d6ff6a
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.false_gtp/dns.log
@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	dns
+#open	2012-10-19-17-07-44
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	trans_id	query	qclass	qclass_name	qtype	qtype_name	rcode	rcode_name	AA	TC	RD	RA	Z	answers	TTLs	rejected
+#types	time	string	addr	port	addr	port	enum	count	string	count	string	count	string	count	string	bool	bool	bool	bool	count	vector[string]	vector[interval]	bool
+1333458871.219794	UWkUyAuUGXf	10.131.24.6	2152	195.178.38.3	53	udp	27595	abcd.efg.hijklm.nm	1	C_INTERNET	1	A	-	-	F	F	T	F	0	-	-	F
+#close	2012-10-19-17-07-44
diff --git a/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/conn.log b/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/conn.log
new file mode 100644
index 0000000000..326205172a
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/conn.log
@@ -0,0 +1,12 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-21-27
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458851.770000	arKYeMETxOg	fe80::224c:4fff:fe43:414c	1234	ff02::1:3	5355	udp	dns	-	-	-	S0	-	0	D	1	80	0	0	UWkUyAuUGXf
+1333458851.770000	UWkUyAuUGXf	118.92.124.41	2152	118.92.124.72	2152	udp	gtpv1	0.199236	152	0	S0	-	0	D	2	208	0	0	(empty)
+1333458851.969236	k6kgXLOoSKl	fe80::224c:4fff:fe43:414c	133	ff02::2	134	icmp	-	-	-	-	OTH	-	0	-	1	56	0	0	UWkUyAuUGXf
+#close	2012-10-19-17-21-27
diff --git a/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/tunnel.log
new file mode 100644
index 0000000000..dfae2ba269
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.inner_ipv6/tunnel.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-17-21-27
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458851.770000	UWkUyAuUGXf	118.92.124.41	2152	118.92.124.72	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458851.969236	UWkUyAuUGXf	118.92.124.41	2152	118.92.124.72	2152	Tunnel::GTPv1	Tunnel::CLOSE
+#close	2012-10-19-17-21-27
diff --git a/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/conn.log b/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/conn.log
new file mode 100644
index 0000000000..9c3e1f6f66
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/conn.log
@@ -0,0 +1,26 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-34-25
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458850.037956	qCaWGmzFtM5	10.131.112.102	51403	94.245.121.253	3544	udp	teredo	-	-	-	SHR	-	0	d	0	0	1	84	GSxOnSLghOa
+1333458850.040098	70MGiRM1Qf4	174.94.190.229	2152	190.104.181.57	2152	udp	gtpv1	0.003698	192	0	S0	-	0	D	2	248	0	0	(empty)
+1333458850.016620	nQcgTWjvg4c	172.24.16.121	61901	94.245.121.251	3544	udp	teredo	-	-	-	S0	-	0	D	1	80	0	0	k6kgXLOoSKl
+1333458850.029781	FrJExwHcSal	172.24.16.67	52298	94.245.121.253	3544	udp	teredo	-	-	-	S0	-	0	D	1	88	0	0	TEfuqmmG4bh
+1333458850.035456	VW0XPVINV8a	190.104.181.210	2152	190.104.181.125	2152	udp	gtpv1	0.000004	194	0	S0	-	0	D	2	250	0	0	(empty)
+1333458850.016620	k6kgXLOoSKl	174.94.190.229	2152	190.104.181.62	2152	udp	gtpv1	0.016267	88	92	SF	-	0	Dd	1	116	1	120	(empty)
+1333458850.029781	TEfuqmmG4bh	190.104.181.254	2152	190.104.181.62	2152	udp	gtpv1	0.000002	192	0	S0	-	0	D	2	248	0	0	(empty)
+1333458850.035460	iE6yhOq3SF	172.27.159.9	63912	94.245.121.254	3544	udp	teredo	-	-	-	S0	-	0	D	1	89	0	0	VW0XPVINV8a
+1333458850.037956	GSxOnSLghOa	190.104.181.57	2152	190.104.181.222	2152	udp	gtpv1	-	-	-	S0	-	0	D	1	120	0	0	(empty)
+1333458850.014199	UWkUyAuUGXf	174.94.190.213	2152	190.104.181.57	2152	udp	gtpv1	-	-	-	S0	-	0	D	1	124	0	0	(empty)
+1333458850.040098	h5DsfNtYzi1	172.24.203.81	54447	65.55.158.118	3544	udp	teredo	0.003698	120	0	S0	-	0	D	2	176	0	0	70MGiRM1Qf4
+1333458850.029783	5OKnoww6xl4	172.24.16.67	52298	65.55.158.118	3544	udp	teredo	-	-	-	S0	-	0	D	1	88	0	0	TEfuqmmG4bh
+1333458850.032887	3PKsZ2Uye21	10.131.42.160	62069	94.245.121.253	3544	udp	teredo	-	-	-	SHR	-	0	d	0	0	1	84	k6kgXLOoSKl
+1333458850.014199	arKYeMETxOg	172.24.204.200	56528	65.55.158.118	3544	udp	teredo	-	-	-	S0	-	0	D	1	88	0	0	UWkUyAuUGXf
+1333458850.035456	fRFu0wcOle6	172.27.159.9	63912	94.245.121.253	3544	udp	teredo	-	-	-	S0	-	0	D	1	89	0	0	VW0XPVINV8a
+1333458850.016620	j4u32Pc5bif	2001:0:5ef5:79fb:38b8:1695:2b37:be8e	128	2002:2571:c817::2571:c817	129	icmp	-	-	-	-	OTH	-	0	-	1	52	0	0	nQcgTWjvg4c
+1333458850.035456	qSsw6ESzHV4	fe80::ffff:ffff:fffe	133	ff02::2	134	icmp	-	0.000004	0	0	OTH	-	0	-	2	96	0	0	fRFu0wcOle6,iE6yhOq3SF
+#close	2012-10-19-17-34-25
diff --git a/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/tunnel.log
new file mode 100644
index 0000000000..904fcc7db6
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.inner_teredo/tunnel.log
@@ -0,0 +1,27 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-17-34-25
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458850.014199	UWkUyAuUGXf	174.94.190.213	2152	190.104.181.57	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.016620	k6kgXLOoSKl	174.94.190.229	2152	190.104.181.62	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.016620	nQcgTWjvg4c	172.24.16.121	61901	94.245.121.251	3544	Tunnel::TEREDO	Tunnel::DISCOVER
+1333458850.029781	TEfuqmmG4bh	190.104.181.254	2152	190.104.181.62	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.035456	VW0XPVINV8a	190.104.181.210	2152	190.104.181.125	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.035456	fRFu0wcOle6	172.27.159.9	63912	94.245.121.253	3544	Tunnel::TEREDO	Tunnel::DISCOVER
+1333458850.035460	iE6yhOq3SF	172.27.159.9	63912	94.245.121.254	3544	Tunnel::TEREDO	Tunnel::DISCOVER
+1333458850.037956	GSxOnSLghOa	190.104.181.57	2152	190.104.181.222	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.040098	70MGiRM1Qf4	174.94.190.229	2152	190.104.181.57	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.043796	70MGiRM1Qf4	174.94.190.229	2152	190.104.181.57	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	nQcgTWjvg4c	172.24.16.121	61901	94.245.121.251	3544	Tunnel::TEREDO	Tunnel::CLOSE
+1333458850.043796	VW0XPVINV8a	190.104.181.210	2152	190.104.181.125	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	k6kgXLOoSKl	174.94.190.229	2152	190.104.181.62	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	TEfuqmmG4bh	190.104.181.254	2152	190.104.181.62	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	iE6yhOq3SF	172.27.159.9	63912	94.245.121.254	3544	Tunnel::TEREDO	Tunnel::CLOSE
+1333458850.043796	GSxOnSLghOa	190.104.181.57	2152	190.104.181.222	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	UWkUyAuUGXf	174.94.190.213	2152	190.104.181.57	2152	Tunnel::GTPv1	Tunnel::CLOSE
+1333458850.043796	fRFu0wcOle6	172.27.159.9	63912	94.245.121.253	3544	Tunnel::TEREDO	Tunnel::CLOSE
+#close	2012-10-19-17-34-25
diff --git a/testing/btest/Baseline/core.tunnels.gtp.non_recursive/out b/testing/btest/Baseline/core.tunnels.gtp.non_recursive/out
new file mode 100644
index 0000000000..a299c4d592
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.non_recursive/out
@@ -0,0 +1 @@
+protocol_violation, [orig_h=74.125.216.149, orig_p=2152/udp, resp_h=10.131.138.69, resp_p=2152/udp], GTP-in-GTP [n\xd9'|\x00\x00\x01\xb6[\xf6\xdc0\xb7d\xe5\xe6\xa76\x91\xfbk\x0e\x02\xc8A\x05\xa8\xe6\xf3Gi\x80(]\xcew\x84\xae}\xd2...]
diff --git a/testing/btest/Baseline/core.tunnels.gtp.not_user_plane_data/conn.log b/testing/btest/Baseline/core.tunnels.gtp.not_user_plane_data/conn.log
new file mode 100644
index 0000000000..ad6e4fb2c4
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.not_user_plane_data/conn.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-46-48
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458850.532814	UWkUyAuUGXf	247.56.43.90	2152	247.56.43.248	2152	udp	-	-	-	-	S0	-	0	D	1	52	0	0	(empty)
+1333458850.867091	arKYeMETxOg	247.56.43.214	2152	237.56.101.238	2152	udp	-	0.028676	12	14	SF	-	0	Dd	1	40	1	42	(empty)
+#close	2012-10-19-17-46-48
diff --git a/testing/btest/Baseline/core.tunnels.gtp.opt_header/conn.log b/testing/btest/Baseline/core.tunnels.gtp.opt_header/conn.log
new file mode 100644
index 0000000000..9f250903f2
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.opt_header/conn.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-17-19-16
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458852.011535	arKYeMETxOg	10.222.10.10	44960	173.194.69.188	5228	tcp	ssl	0.573499	704	1026	S1	-	0	ShADad	17	1604	14	1762	UWkUyAuUGXf
+1333458852.011535	UWkUyAuUGXf	79.188.154.91	2152	243.149.173.198	2152	udp	gtpv1	0.573499	1740	1930	SF	-	0	Dd	17	2216	14	2322	(empty)
+#close	2012-10-19-17-19-16
diff --git a/testing/btest/Baseline/core.tunnels.gtp.opt_header/out b/testing/btest/Baseline/core.tunnels.gtp.opt_header/out
new file mode 100644
index 0000000000..7feeb2a110
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.opt_header/out
@@ -0,0 +1,31 @@
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=60, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=60, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=64, teid=159098, seq=0, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=170, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=56, teid=159098, seq=1, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=194, teid=159098, seq=2, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=111, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=56, teid=159098, seq=3, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=89, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=56, teid=159098, seq=4, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=93, teid=159098, seq=5, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=457, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=157, teid=159098, seq=6, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=173, teid=159098, seq=7, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=137, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=56, teid=159098, seq=8, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=157, teid=159098, seq=9, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=189, teid=159098, seq=10, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=173, teid=159098, seq=11, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=205, teid=159098, seq=12, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=T, pn_flag=F, msg_type=255, length=189, teid=159098, seq=13, n_pdu=0, next_type=0]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
+gtpv1_packet, [version=1, pt_flag=T, rsv=F, e_flag=F, s_flag=F, pn_flag=F, msg_type=255, length=52, teid=1980578736, seq=<uninitialized>, n_pdu=<uninitialized>, next_type=<uninitialized>]
diff --git a/testing/btest/Baseline/core.tunnels.gtp.opt_header/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.opt_header/tunnel.log
new file mode 100644
index 0000000000..a421f399ec
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.opt_header/tunnel.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-17-19-16
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458852.011535	UWkUyAuUGXf	79.188.154.91	2152	243.149.173.198	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458852.585034	UWkUyAuUGXf	79.188.154.91	2152	243.149.173.198	2152	Tunnel::GTPv1	Tunnel::CLOSE
+#close	2012-10-19-17-19-16
diff --git a/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/conn.log b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/conn.log
new file mode 100644
index 0000000000..b5f61564cf
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/conn.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open	2012-10-19-16-44-02
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	count	string	count	count	count	count	table[string]
+1333458850.364667	arKYeMETxOg	10.131.47.185	1923	79.101.110.141	80	tcp	http	0.069783	2100	56702	SF	-	0	ShADadfF	27	3204	41	52594	UWkUyAuUGXf
+1333458850.364667	UWkUyAuUGXf	239.114.155.111	2152	63.94.149.181	2152	udp	gtpv1	0.069813	3420	52922	SF	-	0	Dd	27	4176	41	54070	(empty)
+#close	2012-10-19-16-44-02
diff --git a/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/http.log b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/http.log
new file mode 100644
index 0000000000..8a994d56af
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/http.log
@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	http
+#open	2012-10-19-16-44-02
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	trans_depth	method	host	uri	referrer	user_agent	request_body_len	response_body_len	status_code	status_msg	info_code	info_msg	filename	tags	username	password	proxied	mime_type	md5	extraction_file
+#types	time	string	addr	port	addr	port	count	string	string	string	string	string	count	count	count	string	count	string	string	table[enum]	string	string	table[string]	string	string	file
+1333458850.375568	arKYeMETxOg	10.131.47.185	1923	79.101.110.141	80	1	GET	o-o.preferred.telekomrs-beg1.v2.lscache8.c.youtube.com	/videoplayback?upn=MTU2MDY5NzQ5OTM0NTI3NDY4NDc&sparams=algorithm,burst,cp,factor,id,ip,ipbits,itag,source,upn,expire&fexp=912300,907210&algorithm=throttle-factor&itag=34&ip=212.0.0.0&burst=40&sver=3&signature=832FB1042E20780CFCA77A4DB5EA64AC593E8627.D1166C7E8365732E52DAFD68076DAE0146E0AE01&source=youtube&expire=1333484980&key=yt1&ipbits=8&factor=1.25&cp=U0hSSFRTUl9NSkNOMl9MTVZKOjh5eEN2SG8tZF84&id=ebf1e932d4bd1286&cm2=1	http://s.ytimg.com/yt/swfbin/watch_as3-vflqrJwOA.swf	Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.11 (KHTML, like Gecko; X-SBLSP) Chrome/17.0.963.83 Safari/535.11	0	56320	206	Partial Content	-	-	-	(empty)	-	-	-	application/octet-stream	-	-
+#close	2012-10-19-16-44-02
diff --git a/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/tunnel.log
new file mode 100644
index 0000000000..54c4acd0d6
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.outer_ip_frag/tunnel.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-16-44-02
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458850.364667	UWkUyAuUGXf	239.114.155.111	2152	63.94.149.181	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458850.434480	UWkUyAuUGXf	239.114.155.111	2152	63.94.149.181	2152	Tunnel::GTPv1	Tunnel::CLOSE
+#close	2012-10-19-16-44-02
diff --git a/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/dpd.log b/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/dpd.log
new file mode 100644
index 0000000000..221fa16f4f
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/dpd.log
@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	dpd
+#open	2012-10-19-17-38-54
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	analyzer	failure_reason
+#types	time	string	addr	port	addr	port	enum	string	string
+1333458853.075889	UWkUyAuUGXf	173.86.159.28	2152	213.72.147.186	2152	udp	GTPV1	Truncated GTPv1 [E\x00\x05\xc8G\xea@\x00\x80\x06\xb6\x83\x0a\x83w&\xd9\x14\x9c\x04\xd9\xc2\x00P\xddh\xb4\x8f41eVP\x10\x10\xe0u\xcf\x00\x00...]
+#close	2012-10-19-17-38-54
diff --git a/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/tunnel.log b/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/tunnel.log
new file mode 100644
index 0000000000..659090a581
--- /dev/null
+++ b/testing/btest/Baseline/core.tunnels.gtp.unknown_or_too_short/tunnel.log
@@ -0,0 +1,11 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	tunnel
+#open	2012-10-19-17-38-54
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	tunnel_type	action
+#types	time	string	addr	port	addr	port	enum	enum
+1333458853.034734	UWkUyAuUGXf	173.86.159.28	2152	213.72.147.186	2152	Tunnel::GTPv1	Tunnel::DISCOVER
+1333458853.108391	UWkUyAuUGXf	173.86.159.28	2152	213.72.147.186	2152	Tunnel::GTPv1	Tunnel::CLOSE
+#close	2012-10-19-17-38-54
diff --git a/testing/btest/Traces/tunnels/gtp/gtp10_not_0xff.pcap b/testing/btest/Traces/tunnels/gtp/gtp10_not_0xff.pcap
new file mode 100755
index 0000000000..575edf55f9
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp10_not_0xff.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp1_gn_normal_incl_fragmentation.pcap b/testing/btest/Traces/tunnels/gtp/gtp1_gn_normal_incl_fragmentation.pcap
new file mode 100755
index 0000000000..7ca3b3b05d
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp1_gn_normal_incl_fragmentation.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp2_different_udp_port.pcap b/testing/btest/Traces/tunnels/gtp/gtp2_different_udp_port.pcap
new file mode 100755
index 0000000000..fda97cdaf5
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp2_different_udp_port.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp3_false_gtp.pcap b/testing/btest/Traces/tunnels/gtp/gtp3_false_gtp.pcap
new file mode 100755
index 0000000000..e623fd7912
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp3_false_gtp.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp4_udp_2152_inside.pcap b/testing/btest/Traces/tunnels/gtp/gtp4_udp_2152_inside.pcap
new file mode 100755
index 0000000000..ca67a37046
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp4_udp_2152_inside.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp6_gtp_0x32.pcap b/testing/btest/Traces/tunnels/gtp/gtp6_gtp_0x32.pcap
new file mode 100755
index 0000000000..7dd3905c5d
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp6_gtp_0x32.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp7_ipv6.pcap b/testing/btest/Traces/tunnels/gtp/gtp7_ipv6.pcap
new file mode 100755
index 0000000000..4f358bc374
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp7_ipv6.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp8_teredo.pcap b/testing/btest/Traces/tunnels/gtp/gtp8_teredo.pcap
new file mode 100755
index 0000000000..fff0b2ddfb
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp8_teredo.pcap differ
diff --git a/testing/btest/Traces/tunnels/gtp/gtp9_unknown_or_too_short_payload.pcap b/testing/btest/Traces/tunnels/gtp/gtp9_unknown_or_too_short_payload.pcap
new file mode 100755
index 0000000000..a39026aeff
Binary files /dev/null and b/testing/btest/Traces/tunnels/gtp/gtp9_unknown_or_too_short_payload.pcap differ
diff --git a/testing/btest/core/leaks/gtp_opt_header.test b/testing/btest/core/leaks/gtp_opt_header.test
new file mode 100644
index 0000000000..76c65d5762
--- /dev/null
+++ b/testing/btest/core/leaks/gtp_opt_header.test
@@ -0,0 +1,15 @@
+# Needs perftools support.
+#
+# @TEST-REQUIRES: bro  --help 2>&1 | grep -q mem-leaks
+#
+# @TEST-GROUP: leaks
+#
+# @TEST-EXEC: HEAP_CHECK_DUMP_DIRECTORY=. HEAPCHECK=local bro -m -r $TRACES/tunnels/gtp/gtp6_gtp_0x32.pcap %INPUT >out
+
+# Some GTPv1 headers have some optional fields totaling to a 4-byte extension
+# of the mandatory header.
+
+event gtpv1_g_pdu_packet(outer: connection, inner_gtp: gtpv1_hdr, inner_ip: pkt_hdr)
+	{
+	print "gtpv1_packet", inner_gtp;
+	}
diff --git a/testing/btest/core/tunnels/gtp/different_dl_and_ul.test b/testing/btest/core/tunnels/gtp/different_dl_and_ul.test
new file mode 100644
index 0000000000..136853c463
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/different_dl_and_ul.test
@@ -0,0 +1,10 @@
+# @TEST-EXEC: bro -C -r $TRACES/tunnels/gtp/gtp2_different_udp_port.pcap
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff http.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# Uplink GTP tunnel uses src port 5906 and dst port 2152.
+# One side on port 2152 qualifies for GTP user plane.
+# The Downlink GTP tunnel uses port 2152 for both src and dst.
+# (checksums are incorrect because packets were anonymized and tcprewrite
+# seems to fail to correct the checksums when there's IP fragmentation).
diff --git a/testing/btest/core/tunnels/gtp/false_gtp.test b/testing/btest/core/tunnels/gtp/false_gtp.test
new file mode 100644
index 0000000000..6e84be7323
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/false_gtp.test
@@ -0,0 +1,8 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp3_false_gtp.pcap
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff dns.log
+# @TEST-EXEC: test ! -e tunnel.log
+
+# The fact that udp port 2152 on only one side already qualifies for GTP
+# increases the risk for false positives, see this trace. This is not a
+# GTP packet, but a DNS packet which just happens to use port 2152
diff --git a/testing/btest/core/tunnels/gtp/inner_ipv6.test b/testing/btest/core/tunnels/gtp/inner_ipv6.test
new file mode 100644
index 0000000000..97d8562ecc
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/inner_ipv6.test
@@ -0,0 +1,6 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp7_ipv6.pcap
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# While the majority of user plane traffic inside the GTP tunnel is still IPv4,
+# there is sometimes already native IPv6.
diff --git a/testing/btest/core/tunnels/gtp/inner_teredo.test b/testing/btest/core/tunnels/gtp/inner_teredo.test
new file mode 100644
index 0000000000..9161d31229
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/inner_teredo.test
@@ -0,0 +1,7 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp8_teredo.pcap "Tunnel::delay_teredo_confirmation=F"
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# GTP packets may carry Teredo packets.  Toggled the delay teredo confirmation
+# option so that it shows in the service field (in one case the inner
+# connection of the teredo packet is carried over differing outer connections).
diff --git a/testing/btest/core/tunnels/gtp/non_recursive.test b/testing/btest/core/tunnels/gtp/non_recursive.test
new file mode 100644
index 0000000000..d44bfce79d
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/non_recursive.test
@@ -0,0 +1,11 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp4_udp_2152_inside.pcap %INPUT >out
+# @TEST-EXEC: btest-diff out
+
+# In telecoms there is never a GTP tunnel within another GTP tunnel.
+# So if we find inside a GTP tunnel anohter IP/UDP packet with port 2152,
+# it is just a UDP packet, but not another GTP tunnel.
+
+event protocol_violation(c: connection, atype: count, aid: count, reason: string)
+    {
+    print "protocol_violation", c$id, reason;
+    }
diff --git a/testing/btest/core/tunnels/gtp/not_user_plane_data.test b/testing/btest/core/tunnels/gtp/not_user_plane_data.test
new file mode 100644
index 0000000000..a6a3333360
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/not_user_plane_data.test
@@ -0,0 +1,9 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp10_not_0xff.pcap
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: test ! -e tunnel.log
+
+# There are GTP tunnel packets, which do not contain user plane data. Only
+# those with gtp.message==0xff contain user plane data. Other GTP packets
+# without user plane data are echo request, echo reply, error indication
+# and stop marker (not included in trace). Those non-user plane GTP
+# packets are ignored for now.
diff --git a/testing/btest/core/tunnels/gtp/opt_header.test b/testing/btest/core/tunnels/gtp/opt_header.test
new file mode 100644
index 0000000000..32329c7ca8
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/opt_header.test
@@ -0,0 +1,12 @@
+# @TEST-EXEC: bro -r $TRACES/tunnels/gtp/gtp6_gtp_0x32.pcap %INPUT >out
+# @TEST-EXEC: btest-diff out
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# Some GTPv1 headers have some optional fields totaling to a 4-byte extension
+# of the mandatory header.
+
+event gtpv1_g_pdu_packet(outer: connection, inner_gtp: gtpv1_hdr, inner_ip: pkt_hdr)
+    {
+    print "gtpv1_packet", inner_gtp;
+    }
diff --git a/testing/btest/core/tunnels/gtp/outer_ip_frag.test b/testing/btest/core/tunnels/gtp/outer_ip_frag.test
new file mode 100644
index 0000000000..b2badb9c1b
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/outer_ip_frag.test
@@ -0,0 +1,11 @@
+# @TEST-EXEC: bro -C -r $TRACES/tunnels/gtp/gtp1_gn_normal_incl_fragmentation.pcap
+# @TEST-EXEC: btest-diff conn.log
+# @TEST-EXEC: btest-diff http.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# Normal GTP file, incl. TCP handshake and HTTP message.
+# The inner IP packet is put into a GTP tunnel and as the original user payload
+# is already 1500 byte, the tunneled packet incl. GTP/UDP/IP payload is
+# bigger than 1500 byte and thus the outer IP must be fragmented, as seen here.
+# (checksums are incorrect because packets were anonymized and tcprewrite
+# seems to fail to correct the checksums when there's IP fragmentation).
diff --git a/testing/btest/core/tunnels/gtp/unknown_or_too_short.test b/testing/btest/core/tunnels/gtp/unknown_or_too_short.test
new file mode 100644
index 0000000000..e1b3d4ba20
--- /dev/null
+++ b/testing/btest/core/tunnels/gtp/unknown_or_too_short.test
@@ -0,0 +1,13 @@
+# @TEST-EXEC: bro -C -r $TRACES/tunnels/gtp/gtp9_unknown_or_too_short_payload.pcap
+# @TEST-EXEC: btest-diff dpd.log
+# @TEST-EXEC: btest-diff tunnel.log
+
+# Packet 11, epoch time 1333458853.075889 is malformed. Only 222 byte are
+# captured, although according to the IP header a full packet should be
+# available. In Sessions.cc this throws a weird message at line 710.
+# Packet 12, epoch time 1333458853.075904 is malformed. The user plane
+# packet is no IPv4 nor IPv6 packet. Very probably this is a follow up
+# issue on a problem of the user plane packet before it was put into the
+# tunnel. The user plane packet may got corrupt and then put into 2 tunnel
+# packets, here packet 11 and 12, and in packet 12 the user plane data is
+# part of the remainder of the broken user plane packet of packet 11.