forked from osmocom/wireshark
From Christian Falckenberg: GPRS SNDCP support.
svn path=/trunk/; revision=10591
This commit is contained in:
parent
805b648172
commit
7cf08c6404
1
AUTHORS
1
AUTHORS
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@ -1675,6 +1675,7 @@ Anders Broman <anders.broman [AT] ericsson.com> {
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Christian Falckenberg <christian.falckenberg [AT] nortelnetworks.com> {
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Initial MEGACO support
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GPRS SNDCP support
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}
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Huagang Xie <xie [AT] lids.org> {
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@ -3,7 +3,7 @@
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# a) common to both files and
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# b) portable between both files
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#
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# $Id: Makefile.common,v 1.15 2004/04/13 04:21:30 guy Exp $
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# $Id: Makefile.common,v 1.16 2004/04/13 04:36:20 guy Exp $
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#
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# Ethereal - Network traffic analyzer
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# By Gerald Combs <gerald@ethereal.com>
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@ -415,6 +415,7 @@ DISSECTOR_SRC = \
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../packet-smtp.c \
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../packet-sna.c \
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../packet-snaeth.c \
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../packet-sndcp.c \
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../packet-snmp.c \
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../packet-socks.c \
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../packet-spnego.c \
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@ -0,0 +1,573 @@
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/* packet-sndcp.c
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* Routines for Subnetwork Dependent Convergence Protocol (SNDCP) dissection
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* Copyright 2000, Christian Falckenberg <christian.falckenberg@nortelnetworks.com>
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*
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* $Id: packet-sndcp.c,v 1.1 2004/04/13 04:36:19 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <epan/packet.h>
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#include "reassemble.h"
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/* Bitmasks for the bits in the address field
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*/
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#define MASK_X 0x80
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#define MASK_F 0x40
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#define MASK_T 0x20
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#define MASK_M 0x10
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/* Initialize the protocol and registered fields
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*/
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static int proto_sndcp = -1;
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static int hf_sndcp_x = -1;
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static int hf_sndcp_f = -1;
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static int hf_sndcp_t = -1;
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static int hf_sndcp_m = -1;
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static int hf_sndcp_nsapi = -1;
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static int hf_sndcp_nsapib = -1;
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static int hf_sndcp_dcomp = -1;
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static int hf_sndcp_pcomp = -1;
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static int hf_sndcp_segment = -1;
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static int hf_sndcp_npdu1 = -1;
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static int hf_sndcp_npdu2 = -1;
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/* These fields are used when reassembling N-PDU fragments
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*/
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static int hf_npdu_fragments = -1;
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static int hf_npdu_fragment = -1;
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static int hf_npdu_fragment_overlap = -1;
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static int hf_npdu_fragment_overlap_conflict = -1;
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static int hf_npdu_fragment_multiple_tails = -1;
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static int hf_npdu_fragment_too_long_fragment = -1;
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static int hf_npdu_fragment_error = -1;
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static int hf_npdu_reassembled_in = -1;
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/* Initialize the subtree pointers
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*/
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static gint ett_sndcp = -1;
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static gint ett_sndcp_address_field = -1;
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static gint ett_sndcp_compression_field = -1;
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static gint ett_sndcp_npdu_field = -1;
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static gint ett_npdu_fragment = -1;
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static gint ett_npdu_fragments = -1;
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/* Structure needed for the fragmentation routines in reassemble.c
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*/
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static const fragment_items npdu_frag_items = {
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&ett_npdu_fragment,
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&ett_npdu_fragments,
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&hf_npdu_fragments,
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&hf_npdu_fragment,
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&hf_npdu_fragment_overlap,
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&hf_npdu_fragment_overlap_conflict,
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&hf_npdu_fragment_multiple_tails,
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&hf_npdu_fragment_too_long_fragment,
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&hf_npdu_fragment_error,
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&hf_npdu_reassembled_in,
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"fragments"
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};
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/* dissectors for the data portion of this protocol
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*/
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static dissector_handle_t data_handle;
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static dissector_handle_t ip_handle;
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/* reassembly of N-PDU
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*/
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static GHashTable *npdu_fragment_table = NULL;
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static void
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sndcp_defragment_init(void)
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{
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fragment_table_init(&npdu_fragment_table);
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}
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/* value strings
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*/
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static const value_string nsapi_t[] = {
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{ 0, "Escape mechanism for future extensions"},
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{ 1, "Point-to-Multipoint (PTM-M) Information" },
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{ 2, "Reserved for future use" },
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{ 3, "Reserved for future use" },
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{ 4, "Reserved for future use" },
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{ 5, "Dynamically allocated"},
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{ 6, "Dynamically allocated"},
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{ 7, "Dynamically allocated"},
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{ 8, "Dynamically allocated"},
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{ 9, "Dynamically allocated"},
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{ 10, "Dynamically allocated"},
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{ 11, "Dynamically allocated"},
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{ 12, "Dynamically allocated"},
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{ 13, "Dynamically allocated"},
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{ 14, "Dynamically allocated"},
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{ 15, "Dynamically allocated"},
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{ 0, NULL },
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};
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static const value_string nsapi_abrv[] = {
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{ 0, "0"},
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{ 1, "PTM-M" },
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{ 2, "2" },
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{ 3, "3"},
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{ 4, "4" },
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{ 5, "DYN5" },
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{ 6, "DYN6" },
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{ 7, "DYN7" },
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{ 8, "DYN8" },
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{ 9, "DYN9" },
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{ 10, "DYN10" },
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{ 11, "DYN11" },
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{ 12, "DYN12" },
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{ 13, "DYN13" },
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{ 14, "DYN14" },
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{ 15, "DYN15" },
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{ 0, NULL },
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};
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static const value_string compression_vals[] = {
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{ 0, "No compression"},
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{ 1, "Pointer to selected protocol/data compression mechanism" },
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{ 2, "Pointer to selected protocol/data compression mechanism" },
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{ 3, "Pointer to selected protocol/data compression mechanism" },
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{ 4, "Pointer to selected protocol/data compression mechanism" },
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{ 5, "Pointer to selected protocol/data compression mechanism" },
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{ 6, "Pointer to selected protocol/data compression mechanism" },
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{ 7, "Pointer to selected protocol/data compression mechanism" },
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{ 8, "Pointer to selected protocol/data compression mechanism" },
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{ 9, "Pointer to selected protocol/data compression mechanism" },
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{ 10, "Pointer to selected protocol/data compression mechanism" },
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{ 11, "Pointer to selected protocol/data compression mechanism" },
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{ 12, "Pointer to selected protocol/data compression mechanism" },
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{ 13, "Pointer to selected protocol/data compression mechanism" },
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{ 14, "Pointer to selected protocol/data compression mechanism" },
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{ 15, "Pointer to selected protocol/data compression mechanism" },
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{ 0, NULL },
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};
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static const true_false_string x_bit = {
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"Invalid",
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"Set to 0 by transmitting SNDCP entity (ignored by receiver)"
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};
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static const true_false_string f_bit = {
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"This SN-PDU is the first segment of an N-PDU",
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"This SN-PDU is not the first segment of an N-PDU"
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};
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static const true_false_string t_bit = {
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"SN-UNITDATA PDU",
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"SN-DATA PDU"
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};
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static const true_false_string m_bit = {
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"Not the last segment of N-PDU, more segments to follow",
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"Last segment of N-PDU"
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};
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/* Code to actually dissect the packets
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*/
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static void
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dissect_sndcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 addr_field, comp_field, npdu_field1, nsapi, dcomp=0, pcomp=0;
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guint16 offset=0, npdu=0, segment=0, npdu_field2;
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tvbuff_t *next_tvb, *npdu_tvb;
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guint32 len;
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gboolean first, more_frags, unack;
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/* Set up structures needed to add the protocol subtree and manage it
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*/
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proto_item *ti, *address_field_item, *compression_field_item, *npdu_field_item;
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proto_tree *sndcp_tree = NULL, *address_field_tree, *compression_field_tree, *npdu_field_tree;
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/* Make entries in Protocol column and clear Info column on summary display
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*/
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNDCP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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/* create display subtree for the protocol
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*/
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if (tree) {
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ti = proto_tree_add_item(tree, proto_sndcp, tvb, 0, -1, FALSE);
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sndcp_tree = proto_item_add_subtree(ti, ett_sndcp);
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}
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/* get address field from next byte
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*/
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addr_field = tvb_get_guint8(tvb,offset);
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nsapi = addr_field & 0xF;
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first = addr_field & MASK_F;
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more_frags = addr_field & MASK_M;
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unack = addr_field & MASK_T;
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/* add subtree for the address field
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*/
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if (tree) {
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address_field_item = proto_tree_add_uint_format(sndcp_tree,hf_sndcp_nsapi,
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tvb, offset,1, nsapi,
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"Address field NSAPI: %d, ", nsapi );
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address_field_tree = proto_item_add_subtree(address_field_item, ett_sndcp_address_field);
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proto_tree_add_boolean(address_field_tree, hf_sndcp_x, tvb,offset,1, addr_field );
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proto_tree_add_boolean(address_field_tree, hf_sndcp_f, tvb,offset,1, addr_field );
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proto_tree_add_boolean(address_field_tree, hf_sndcp_t, tvb,offset,1, addr_field );
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proto_tree_add_boolean(address_field_tree, hf_sndcp_m, tvb,offset,1, addr_field );
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proto_tree_add_uint(address_field_tree, hf_sndcp_nsapib, tvb, offset, 1, addr_field );
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}
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offset++;
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/* get compression pointers from next byte if this is the first segment
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*/
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if (first) {
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comp_field = tvb_get_guint8(tvb,offset);
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dcomp = comp_field & 0xF0;
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pcomp = comp_field & 0x0F;
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/* add subtree for the compression field
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*/
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if (tree) {
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if (!dcomp && !pcomp) {
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compression_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,1, "No compression");
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}
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else if (dcomp && !pcomp) {
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compression_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,1, "Data compression");
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}
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else if (!dcomp && pcomp) {
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compression_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,1, "Protocol compression");
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}
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else if (dcomp && pcomp) {
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compression_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,1, "Data and Protocol compression");
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}
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compression_field_tree = proto_item_add_subtree(compression_field_item, ett_sndcp_compression_field);
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proto_tree_add_uint(compression_field_tree, hf_sndcp_dcomp, tvb, offset, 1, comp_field );
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proto_tree_add_uint(compression_field_tree, hf_sndcp_pcomp, tvb, offset, 1, comp_field );
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}
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offset++;
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/* get N-PDU number from next byte for acknowledged mode (only for first segment)
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*/
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if (!unack) {
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npdu = npdu_field1 = tvb_get_guint8(tvb,offset);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "SN-DATA N-PDU %d ", npdu_field1);
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if (tree) {
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npdu_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,1, "Acknowledged mode, N-PDU %d", npdu_field1 );
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npdu_field_tree = proto_item_add_subtree(npdu_field_item, ett_sndcp_npdu_field);
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_npdu1, tvb, offset, 1, npdu_field1 );
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offset++;
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}
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}
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}
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/* get segment and N-PDU number from next two bytes for unacknowledged mode
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*/
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if (unack) {
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npdu_field2 = tvb_get_ntohs(tvb, offset);
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segment = (npdu_field2 & 0xF000) >> 12;
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npdu = (npdu_field2 & 0x0FFF);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "SN-UNITDATA N-PDU %d (segment %d)", npdu, segment);
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if (tree) {
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npdu_field_item = proto_tree_add_text(sndcp_tree, tvb, offset,2, "Unacknowledged mode, N-PDU %d (segment %d)", npdu, segment );
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npdu_field_tree = proto_item_add_subtree(npdu_field_item, ett_sndcp_npdu_field);
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_segment, tvb, offset, 2, npdu_field2 );
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proto_tree_add_uint(npdu_field_tree, hf_sndcp_npdu2, tvb, offset, 2, npdu_field2 );
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}
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offset += 2;
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}
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/* handle N-PDU data, reassemble if necessary
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*/
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if (first && !more_frags) {
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next_tvb = tvb_new_subset (tvb, offset, -1, -1);
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if (!dcomp && !pcomp) {
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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}
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else {
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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}
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else {
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/* Try reassembling fragments
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*/
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fragment_data *fd_npdu = NULL;
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guint32 reassembled_in = 0;
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gboolean save_fragmented = pinfo->fragmented;
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len = tvb_length_remaining(tvb, offset);
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pinfo->fragmented = TRUE;
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if (unack)
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fd_npdu = fragment_add_seq(tvb, offset, pinfo, npdu,
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npdu_fragment_table, segment, len, more_frags);
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else
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fd_npdu = fragment_add(tvb, offset, pinfo, npdu,
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npdu_fragment_table, offset, len, more_frags);
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npdu_tvb = process_reassembled_data(tvb, offset, pinfo,
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"Reassembled N-PDU", fd_npdu, &npdu_frag_items,
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NULL, sndcp_tree);
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if (fd_npdu) {
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/* Reassembled
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*/
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reassembled_in = fd_npdu->reassembled_in;
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if (pinfo->fd->num == reassembled_in) {
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/* Reassembled in this very packet:
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* We can safely hand the tvb to the IP dissector
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*/
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call_dissector(ip_handle, npdu_tvb, pinfo, tree);
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}
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else {
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/* Not reassembled in this packet
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*/
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"(N-PDU payload reassembled in packet %u)",
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fd_npdu->reassembled_in);
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}
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if (tree) {
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proto_tree_add_text(sndcp_tree, tvb, offset, -1, "Payload");
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}
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}
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} else {
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/* Not reassembled yet, or not reassembled at all
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*/
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if (check_col(pinfo->cinfo, COL_INFO)) {
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if (unack)
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col_append_fstr(pinfo->cinfo, COL_INFO, "(Unreassembled fragment %u)", segment);
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else
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col_append_str(pinfo->cinfo, COL_INFO, "(Unreassembled fragment)");
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}
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if (tree) {
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proto_tree_add_text(sndcp_tree, tvb, offset, -1, "Payload");
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}
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}
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/* Now reset fragmentation information in pinfo
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*/
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pinfo->fragmented = save_fragmented;
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}
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}
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/* Register the protocol with Ethereal
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this format is required because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_sndcp(void)
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{
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/* Setup list of header fields
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*/
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static hf_register_info hf[] = {
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{ &hf_sndcp_nsapi,
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{ "NSAPI",
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"sndcp.nsapi",
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FT_UINT8, BASE_DEC, VALS(nsapi_abrv), 0x0,
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"Network Layer Service Access Point Identifier", HFILL
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}
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},
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{ &hf_sndcp_x,
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||||
{ "Spare bit",
|
||||
"sndcp.x",
|
||||
FT_BOOLEAN,8, TFS(&x_bit), MASK_X,
|
||||
"Spare bit (should be 0)", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_f,
|
||||
{ "First segment indicator bit",
|
||||
"sndcp.f",
|
||||
FT_BOOLEAN,8, TFS(&f_bit), MASK_F,
|
||||
"First segment indicator bit", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_t,
|
||||
{ "Type",
|
||||
"sndcp.t",
|
||||
FT_BOOLEAN,8, TFS(&t_bit), MASK_T,
|
||||
"SN-PDU Type", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_m,
|
||||
{ "More bit",
|
||||
"sndcp.m",
|
||||
FT_BOOLEAN,8, TFS(&m_bit), MASK_M,
|
||||
"More bit", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_dcomp,
|
||||
{ "DCOMP",
|
||||
"sndcp.dcomp",
|
||||
FT_UINT8, BASE_DEC, VALS(compression_vals), 0xF0,
|
||||
"Data compression coding", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_pcomp,
|
||||
{ "PCOMP",
|
||||
"sndcp.pcomp",
|
||||
FT_UINT8, BASE_DEC, VALS(compression_vals), 0x0F,
|
||||
"Protocol compression coding", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_nsapib,
|
||||
{ "NSAPI",
|
||||
"sndcp.nsapib",
|
||||
FT_UINT8, BASE_DEC , VALS(nsapi_t), 0xf,
|
||||
"Network Layer Service Access Point Identifier ",HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_segment,
|
||||
{ "Segment",
|
||||
"sndcp.segment",
|
||||
FT_UINT16, BASE_DEC, NULL, 0xF000,
|
||||
"Segment number", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_npdu1,
|
||||
{ "N-PDU",
|
||||
"sndcp.npdu",
|
||||
FT_UINT8, BASE_DEC, NULL, 0,
|
||||
"N-PDU", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_sndcp_npdu2,
|
||||
{ "N-PDU",
|
||||
"sndcp.npdu",
|
||||
FT_UINT16, BASE_DEC, NULL, 0x0FFF,
|
||||
"N-PDU", HFILL
|
||||
}
|
||||
},
|
||||
|
||||
/* Fragment fields
|
||||
*/
|
||||
{ &hf_npdu_fragment_overlap,
|
||||
{ "Fragment overlap",
|
||||
"npdu.fragment.overlap",
|
||||
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||||
"Fragment overlaps with other fragments", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragment_overlap_conflict,
|
||||
{ "Conflicting data in fragment overlap",
|
||||
"npdu.fragment.overlap.conflict",
|
||||
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||||
"Overlapping fragments contained conflicting data", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragment_multiple_tails,
|
||||
{ "Multiple tail fragments found",
|
||||
"npdu.fragment.multipletails",
|
||||
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||||
"Several tails were found when defragmenting the packet", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragment_too_long_fragment,
|
||||
{ "Fragment too long",
|
||||
"npdu.fragment.toolongfragment",
|
||||
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||||
"Fragment contained data past end of packet", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragment_error,
|
||||
{ "Defragmentation error",
|
||||
"npdu.fragment.error",
|
||||
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
||||
"Defragmentation error due to illegal fragments", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_reassembled_in,
|
||||
{ "Reassembled in",
|
||||
"npdu.reassembled.in",
|
||||
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
||||
"N-PDU fragments are reassembled in the given packet", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragment,
|
||||
{ "N-PDU Fragment",
|
||||
"npdu.fragment",
|
||||
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
||||
"N-PDU Fragment", HFILL
|
||||
}
|
||||
},
|
||||
{ &hf_npdu_fragments,
|
||||
{ "N-PDU Fragments",
|
||||
"npdu.fragments",
|
||||
FT_NONE, BASE_NONE, NULL, 0x0,
|
||||
"N-PDU Fragments", HFILL
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/* Setup protocol subtree array */
|
||||
static gint *ett[] = {
|
||||
&ett_sndcp ,
|
||||
&ett_sndcp_address_field,
|
||||
&ett_sndcp_compression_field,
|
||||
&ett_sndcp_npdu_field,
|
||||
&ett_npdu_fragment,
|
||||
&ett_npdu_fragments,
|
||||
};
|
||||
|
||||
/* Register the protocol name and description */
|
||||
proto_sndcp = proto_register_protocol("Subnetwork Dependent Convergence Protocol",
|
||||
"SNDCP", "sndcp");
|
||||
|
||||
/* Required function calls to register the header fields and subtrees used */
|
||||
proto_register_field_array(proto_sndcp, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
register_dissector("sndcp", dissect_sndcp, proto_sndcp);
|
||||
register_init_routine(sndcp_defragment_init);
|
||||
}
|
||||
|
||||
/* If this dissector uses sub-dissector registration add a registration routine.
|
||||
This format is required because a script is used to find these routines and
|
||||
create the code that calls these routines.
|
||||
*/
|
||||
void
|
||||
proto_reg_handoff_sndcp(void)
|
||||
{
|
||||
dissector_handle_t sndcp_handle;
|
||||
|
||||
sndcp_handle = create_dissector_handle(dissect_sndcp, proto_sndcp);
|
||||
|
||||
/* Register SNDCP dissector with LLC layer for SAPI 3,5,9 and 11
|
||||
*/
|
||||
dissector_add("llcgprs.sapi", 3, sndcp_handle);
|
||||
dissector_add("llcgprs.sapi", 5, sndcp_handle);
|
||||
dissector_add("llcgprs.sapi", 9, sndcp_handle);
|
||||
dissector_add("llcgprs.sapi", 11, sndcp_handle);
|
||||
|
||||
/* Find IP and data handle for upper layer dissectors
|
||||
*/
|
||||
ip_handle = find_dissector("ip");
|
||||
data_handle = find_dissector("data");
|
||||
}
|
Loading…
Reference in New Issue