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wireshark/packet-gprs-ns.c

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/* 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 1.8 2004/02/18 10:11:51 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 int proto_gprs_ns = -1;
static gint ett_gprs_ns = -1;
static int hf_gprs_ns_pdutype = -1;
static int hf_gprs_ns_ie_type = -1;
static int hf_gprs_ns_ie_length = -1;
static int hf_gprs_ns_cause = -1;
static int hf_gprs_ns_vci = -1;
static int hf_gprs_ns_nsei = -1;
static int hf_gprs_ns_bvci = -1;
static int hf_gprs_ns_spare = -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 bssgp_handle;
static void
process_tlvs(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
guint8 type;
int length_len;
guint16 length;
guint8 cause;
guint16 nsvc, bvc, nsei;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
type = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_gprs_ns_ie_type,
tvb, offset, 1, type);
offset++;
length_len = 1;
length = tvb_get_guint8(tvb, offset);
if (length & 0x80) {
/*
* This is the final octet of the length.
*/
length &= 0x7F;
} else {
/*
* One more octet.
*/
length_len++;
length = (length << 8) | tvb_get_guint8(tvb, offset);
}
proto_tree_add_uint(tree, hf_gprs_ns_ie_length,
tvb, offset, length_len, length);
offset += length_len;
switch (type) {
case Cause:
if (length == 1) {
cause = tvb_get_guint8(tvb, offset);
if (tree) {
proto_tree_add_uint(tree,
hf_gprs_ns_cause, tvb, offset, 1,
cause);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO,
" Cause: %s",
val_to_str(cause, cause_val, "Unknown (0x%02x)"));
}
} else {
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Bad cause length %u, should be 1",
length);
}
}
break;
case NS_VCI:
if (length == 2) {
nsvc = tvb_get_ntohs(tvb, offset);
if (tree) {
proto_tree_add_uint(tree,
hf_gprs_ns_vci, tvb, offset, 2,
nsvc);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO,
" NSVCI: %u", nsvc);
}
} else {
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Bad NS-VCI length %u, should be 2",
length);
}
}
break;
case NS_PDU:
/*
* XXX - dissect as a GPRS NS PDU.
* Do the usual "error packet" stuff.
*/
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Error PDU");
}
break;
case BVCI:
if (length == 2) {
bvc = tvb_get_ntohs(tvb, offset);
if (tree) {
proto_tree_add_uint(tree,
hf_gprs_ns_bvci, tvb, offset, 2,
bvc);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO,
" BVCI: %u", bvc);
}
} else {
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Bad BVCI length %u, should be 2",
length);
}
}
break;
case NSEI:
if (length == 2) {
nsei = tvb_get_ntohs(tvb, offset);
if (tree) {
proto_tree_add_uint(tree,
hf_gprs_ns_nsei, tvb, offset, 2,
nsei);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO,
" NSEI: %u", nsei);
}
} else {
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Bad NSEI length %u, should be 2",
length);
}
}
break;
default:
if (tree) {
proto_tree_add_text(tree,
tvb, offset, length,
"Unknown IE contents");
}
break;
}
offset += length;
}
}
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;
guint16 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,
val_to_str(nspdu, ns_pdu_type, "Unknown PDU type (0x%02x)"));
}
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:
case NS_BLOCK_ACK:
case NS_RESET:
case NS_RESET_ACK:
case NS_STATUS:
/*
* Process TLVs.
*/
process_tlvs(tvb, offset, pinfo, gprs_ns_tree);
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(bssgp_handle, next_tvb, pinfo, tree);
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_ie_type, {
"IE Type", "gprs_ns.ietype", FT_UINT8, BASE_HEX,
VALS(ns_ie_type), 0x0, "IE Type", HFILL}},
{ &hf_gprs_ns_ie_length, {
"IE Length", "gprs_ns.ielength", FT_UINT16, BASE_DEC,
NULL, 0x0, "IE Length", 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)
{
bssgp_handle = find_dissector("bssgp");
}
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