From Josef Korelus <jkor [AT] quick.cz>: GPRS Network

Service-over-Frame-Relay support, including preference for Frame Relay
to select FRF 3.2/Cisco HDLC encapsulation or encapsulation of GPRS NS
PDUs.

svn path=/trunk/; revision=8362

1 files changed, 258 insertions, 0 deletions

diff --git a/packet-gprs-ns.c b/packet-gprs-ns.c
new file mode 100644
index 0000000000..337607e223
--- /dev/null
+++ b/packet-gprs-ns.c
@@ -0,0 +1,258 @@
+/* packet-gprs-ns.c
+ * Routines for GPRS Network Service (ETSI GSM 08.16 version 6.3.0)
+ * dissection
+ * Copyright 2003, Josef Korelus <jkor@quick.cz>
+ *
+ * $Id: packet-gprs-ns.c,v 1.1 2003/09/03 22:26:38 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+
+/*ETSI  GSM08.16 Network Service */
+#define NS_UNITDATA     0x00
+#define NS_RESET        0x02
+#define NS_RESET_ACK    0x03
+#define NS_BLOCK        0x04
+#define NS_BLOCK_ACK    0x05
+#define NS_UNBLOCK      0x06
+#define NS_UNBLOCK_ACK  0x07
+#define NS_STATUS       0x08
+#define NS_ALIVE        0x0a
+#define NS_ALIVE_ACK    0x0b
+
+/*ETSI  GSM 08.16 IEI coding */
+#define Cause           0x00
+#define NS_VCI          0x01
+#define NS_PDU          0x02
+#define BVCI            0x03
+#define NSEI            0x04
+
+static gint proto_gprs_ns = -1;
+static gint ett_gprs_ns = -1;
+static gint hf_gprs_ns_vci = -1;
+static gint hf_gprs_ns_pdutype = -1;
+static gint hf_gprs_ns_nsei = -1;
+static gint hf_gprs_ns_bvci = -1;
+static gint hf_gprs_ns_spare = -1;
+static gint hf_gprs_ns_cause = -1;
+ 
+static const value_string ns_pdu_type[]= {
+        { NS_UNITDATA,    "NS-UNITDATA" },
+        { NS_RESET,       "NS-RESET" },
+        { NS_RESET_ACK,   "NS-RESET-ACK" },
+        { NS_BLOCK,       "NS-BLOCK" },
+        { NS_BLOCK_ACK,   "NS-BLOCK-ACK" },
+        { NS_UNBLOCK,     "NS-UNBLOCK" },
+        { NS_UNBLOCK_ACK, "NS-UNBLOCK-ACK" },
+        { NS_STATUS,      "NS-STATUS" },
+        { NS_ALIVE,       "NS-ALIVE" },
+        { NS_ALIVE_ACK,   "NS-ALIVE-ACK" },
+        { 0,               NULL },
+};
+
+static const value_string ns_ie_type[]= {
+        {  Cause,   "Cause" },
+        {  NS_VCI,  "NS-VCI"},  
+        {  NS_PDU,  "NS PDU"},  
+        {  BVCI,    "BVCI"}, 
+        {  NSEI,    "NSEI"},
+        {  0,        NULL },
+};
+
+static const value_string cause_val[]= {
+        { 0x0,    "Transit network failure" },
+        { 0x1,    "O&M intervention" },
+        { 0x2,    "Equipment failure" },
+        { 0x3,    "NS-VC blocked " },
+        { 0x4,    "NS-VC unknown" },
+        { 0x5,    "NS-VC unknown on that NSE" },
+        { 0x8,    "Semantically incorrect PDU" },
+        { 0xa,    "PDU not compatible with protocol state" },
+        { 0xb,    "Protocol error - unspecified" },
+        { 0xc,    "Invalid essential IE" },
+        { 0xd,    "Missing essential IE" },
+        { 0,      NULL },	
+};
+ 
+static dissector_handle_t data_handle;
+
+static void
+dissect_gprs_ns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	int offset = 0;
+	proto_item *ti = NULL;
+	proto_tree *gprs_ns_tree = NULL;
+	guint8 nspdu, cause;
+	guint16 nsvc, bvc;
+	tvbuff_t *next_tvb;
+  
+	if (check_col(pinfo->cinfo, COL_PROTOCOL))
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "GPRS NS");
+	if (check_col(pinfo->cinfo, COL_INFO))
+		col_clear(pinfo->cinfo, COL_INFO);
+
+	nspdu = tvb_get_guint8(tvb,offset);
+	if (check_col(pinfo->cinfo, COL_INFO))
+		col_add_str(pinfo->cinfo, COL_INFO, match_strval(nspdu, ns_pdu_type));
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_gprs_ns, tvb, 0, -1, FALSE);
+		gprs_ns_tree = proto_item_add_subtree(ti, ett_gprs_ns);
+		proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_pdutype, tvb, 0, 1, nspdu);
+	}
+	offset++;
+
+	switch (nspdu) {
+
+	case NS_ALIVE:
+	case NS_ALIVE_ACK:
+	case NS_UNBLOCK:
+	case NS_UNBLOCK_ACK:
+		break;
+
+	case NS_BLOCK:
+		offset=offset+2;
+		cause = tvb_get_guint8(tvb,offset);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_cause, tvb, offset, 1, cause);
+		offset=offset+3;
+		nsvc = tvb_get_ntohs(tvb,offset);
+		if (check_col(pinfo->cinfo, COL_INFO))
+			col_append_fstr(pinfo->cinfo, COL_INFO, " NSVCI: %u Cause: %s", nsvc,
+					match_strval(cause,cause_val));
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_vci, tvb, offset, 2, nsvc);
+		offset=offset+2;
+		break;
+
+	case NS_BLOCK_ACK:
+		offset=offset+3;
+		nsvc = tvb_get_ntohs(tvb,offset);
+		if (check_col(pinfo->cinfo, COL_INFO))
+			col_append_fstr(pinfo->cinfo, COL_INFO, " NSVCI: %u", nsvc);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_vci, tvb, offset, 2, nsvc);
+		offset=offset+2;
+		break;
+
+	case NS_RESET:
+		offset=offset+2;
+		cause = tvb_get_guint8(tvb,offset);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_cause, tvb, offset, 1, cause);
+		offset=offset+3;
+		nsvc = tvb_get_ntohs(tvb,offset);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_vci, tvb, offset, 2, nsvc);
+		offset=offset+4;
+		bvc = tvb_get_ntohs(tvb,offset); 		
+		if (check_col(pinfo->cinfo, COL_INFO))
+			col_append_fstr(pinfo->cinfo, COL_INFO, " NSVCI: %u NSEI: %u Cause: %s",
+					nsvc, bvc, match_strval(cause, cause_val));
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_nsei, tvb, offset, 2, bvc);
+		offset=offset+2;
+		break;
+
+	case NS_RESET_ACK:
+		offset=offset+2;
+		nsvc = tvb_get_ntohs(tvb,offset);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_vci, tvb, offset, 2, nsvc);
+		offset=offset+4;
+		bvc = tvb_get_ntohs(tvb,offset); 		
+		if (check_col(pinfo->cinfo, COL_INFO))
+			col_append_fstr(pinfo->cinfo, COL_INFO, " NSVCI: %u NSEI: %u", nsvc, bvc);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_nsei, tvb, offset, 2, bvc);
+		offset=offset+2;
+		break;
+
+	case NS_UNITDATA:
+		if (tree)
+			proto_tree_add_item(gprs_ns_tree, hf_gprs_ns_spare, tvb, offset, 1, FALSE);
+		offset++;
+		bvc = tvb_get_ntohs(tvb,offset);
+		if (check_col(pinfo->cinfo, COL_INFO))
+			col_append_fstr(pinfo->cinfo, COL_INFO, " BVCI: %u", bvc);
+		if (tree)
+			proto_tree_add_uint(gprs_ns_tree, hf_gprs_ns_bvci, tvb, offset, 2, bvc);
+		offset=offset+2;
+		next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+		call_dissector(data_handle, next_tvb, pinfo, tree);
+		break;
+
+	case NS_STATUS:
+		break;		 
+
+	default:
+		break;
+	}
+}
+
+/* Register the protocol with Ethereal */
+void
+proto_register_gprs_ns(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_gprs_ns_pdutype, {
+		  "PDU Type", "gprs_ns.pdutype", FT_UINT8, BASE_HEX,
+		  VALS(ns_pdu_type), 0x0, "NS Command", HFILL}},
+		{ &hf_gprs_ns_cause, {
+		  "Cause", "gprs_ns.cause", FT_UINT8, BASE_HEX,
+		  VALS(cause_val), 0x0, "Cause", HFILL}},
+		{ &hf_gprs_ns_vci, {
+		  "NSVCI", "gprs_ns.nsvci", FT_UINT16, BASE_DEC,
+		  NULL, 0x0, "Network Service Virtual Connection id", HFILL}},
+		{ &hf_gprs_ns_nsei, {
+		  "NSEI", "gprs_ns.nsei", FT_UINT16, BASE_DEC,
+		  NULL, 0x0, "Network Service Entity Id", HFILL}},
+		{ &hf_gprs_ns_bvci, {
+		  "BVCI", "gprs_ns.bvci", FT_UINT16, BASE_DEC,
+		  NULL, 0x0, "Cell ID", HFILL}},
+		{ &hf_gprs_ns_spare, {
+		  "Spare octet", "gprs_ns.spare", FT_UINT8, BASE_HEX,
+		  NULL, 0x0, "", HFILL}},
+	};
+
+	/* Setup protocol subtree array */
+	static gint *ett[] = {
+		 &ett_gprs_ns,
+	};
+
+	proto_gprs_ns = proto_register_protocol("GPRS Network service",
+	    "GPRS NS","gprs_ns");
+	proto_register_field_array(proto_gprs_ns, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	register_dissector("gprs_ns", dissect_gprs_ns, proto_gprs_ns);
+}
+
+void
+proto_reg_handoff_gprs_ns(void)
+{
+        data_handle = find_dissector("data");
+}