6421106005
svn path=/trunk/; revision=13549
466 lines
18 KiB
C
466 lines
18 KiB
C
/* packet-llcgprs.c
|
|
* Routines for Logical Link Control GPRS dissection ETSI 4.64
|
|
* Copyright 2000, Josef Korelus <jkor@quick.cz>
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <glib.h>
|
|
|
|
#ifdef NEED_SNPRINTF_H
|
|
# include "snprintf.h"
|
|
#endif
|
|
|
|
#include <epan/packet.h>
|
|
#include "prefs.h"
|
|
/*
|
|
#include "packet-llcgprs.h"
|
|
*/
|
|
#define I_FORMAT 1
|
|
#define S_FORMAT 2
|
|
#define UI_FORMAT 3
|
|
#define U_FORMAT 4
|
|
#define I_SACK 5
|
|
#define S_SACK 6
|
|
#define UI_MASK_FMT 0xe000
|
|
#define UI_MASK_SPB 0x1800
|
|
#define UI_MASK_NU 0x07fc
|
|
#define UI_MASK_E 0x0002
|
|
#define UI_MASK_PM 0x0001
|
|
|
|
/* Initialize the protocol and registered fields */
|
|
static int proto_llcgprs = -1;
|
|
static int hf_llcgprs_pd = -1;
|
|
static int hf_llcgprs_cr = -1;
|
|
static int hf_llcgprs_sapi = -1;
|
|
static int hf_llcgprs_sapib = -1;
|
|
static int hf_llcgprs_U_fmt = -1;/* 3 upper bits in controlfield (UI format) */
|
|
static int hf_llcgprs_sp_bits = -1; /*Spare bits in control field*/
|
|
static int hf_llcgprs_NU = -1; /*Transmited unconfirmed sequence number*/
|
|
static int hf_llcgprs_E_bit = -1;/* Encryption mode bit*/
|
|
static int hf_llcgprs_PM_bit = -1;
|
|
static int hf_llcgprs_Un = -1;
|
|
static int hf_llcgprs_As = -1;
|
|
static int hf_llcgprs_ucom = -1;
|
|
static int hf_llcgprs_PF = -1;
|
|
static int hf_llcgprs_S_fmt = -1;
|
|
static int hf_llcgprs_NR = -1;
|
|
static int hf_llcgprs_sjsd = -1;
|
|
/*static int hf_llcgprs_pd = -1;
|
|
*/
|
|
/* Initialize the subtree pointers */
|
|
static gint ett_llcgprs = -1;
|
|
static gint ett_llcgprs_adf = -1;
|
|
static gint ett_llcgprs_ctrlf = -1;
|
|
static gint ett_ui = -1;
|
|
static gint ett_llcgprs_sframe = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
static gboolean ignore_cipher_bit = FALSE;
|
|
|
|
static dissector_table_t llcgprs_subdissector_table;
|
|
static const value_string sapi_t[] = {
|
|
{ 0, "Reserved"},
|
|
{ 1, "GPRS Mobility Management" },
|
|
{ 2, "Tunnelling of messages 2" },
|
|
{ 3, "User data 3"},
|
|
{ 4, "Reserved" },
|
|
{ 5, "User data 5" },
|
|
{ 6, "Reserved" },
|
|
{ 7, "SMS" },
|
|
{ 8, "Tunneling of messages 8" },
|
|
{ 9, "User data 9" },
|
|
{ 10, "Reserved" },
|
|
{ 11, "User data 11" },
|
|
{ 12, "Reserved" },
|
|
{ 13, "Reserved" },
|
|
{ 14, "Reserved" },
|
|
{ 15, "Reserved" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static const value_string sapi_abrv[] = {
|
|
{ 0, "0"},
|
|
{ 1, "LLGMM" },
|
|
{ 2, "TOM2" },
|
|
{ 3, "LL3"},
|
|
{ 4, "4" },
|
|
{ 5, "LL5" },
|
|
{ 6, "6" },
|
|
{ 7, "LLSMS" },
|
|
{ 8, "TOM8" },
|
|
{ 9, "LL9" },
|
|
{ 10, "10" },
|
|
{ 11, "LL11" },
|
|
{ 12, "12" },
|
|
{ 13, "13" },
|
|
{ 14, "14" },
|
|
{ 15, "15" },
|
|
{ 0, NULL },
|
|
};
|
|
static const true_false_string a_bit = {
|
|
"To solicit an acknowledgement from the peer LLE. ",
|
|
"The peer LLE is not requested to send an acknowledgment."
|
|
};
|
|
|
|
static const true_false_string pd_bit = {
|
|
"Invalid frame PD=1",
|
|
"OK"
|
|
};
|
|
static const true_false_string e_bit = {
|
|
" encrypted frame",
|
|
" non encrypted frame"
|
|
};
|
|
static const true_false_string pm_bit = {
|
|
"FCS covers the frame header and information fields",
|
|
"FCS covers only the frame header and first N202 octets of the information field"
|
|
};
|
|
static const true_false_string cr_bit = {
|
|
"DownLink/UpLink = Command/Response",
|
|
"DownLink/UpLink = Response/Command"
|
|
};
|
|
/* bits are swaped comparing with "Table 3" in ETSI document*/
|
|
static const value_string pme[] = {
|
|
{ 0, "unprotected,non-ciphered information" },
|
|
{ 1, "protected, non-ciphered information" },
|
|
{ 2, "unprotected,ciphered information"},
|
|
{ 3, "protected, ciphered information" },
|
|
{ 0, NULL},
|
|
};
|
|
|
|
static const value_string cr_formats_unnumb[]= {
|
|
{ 0x1, "DM-response" },
|
|
{ 0x4, "DISC-command" },
|
|
{ 0x6, "UA-response" },
|
|
{ 0x7, "SABM" },
|
|
{ 0x8, "FRMR" },
|
|
{ 0xb, "XID" },
|
|
{ 0, NULL },
|
|
};
|
|
static const value_string cr_formats_ipluss[] = {
|
|
{ 0x0,"RR" },
|
|
{ 0x1,"ACK" },
|
|
{ 0x2,"RNR" },
|
|
{ 0x3,"SACK" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
/* CRC24 table - FCS */
|
|
guint32 tbl_crc24[256] = {
|
|
0x00000000, 0x00d6a776, 0x00f64557, 0x0020e221, 0x00b78115, 0x00612663, 0x0041c442, 0x00976334,
|
|
0x00340991, 0x00e2aee7, 0x00c24cc6, 0x0014ebb0, 0x00838884, 0x00552ff2, 0x0075cdd3, 0x00a36aa5,
|
|
0x00681322, 0x00beb454, 0x009e5675, 0x0048f103, 0x00df9237, 0x00093541, 0x0029d760, 0x00ff7016,
|
|
0x005c1ab3, 0x008abdc5, 0x00aa5fe4, 0x007cf892, 0x00eb9ba6, 0x003d3cd0, 0x001ddef1, 0x00cb7987,
|
|
0x00d02644, 0x00068132, 0x00266313, 0x00f0c465, 0x0067a751, 0x00b10027, 0x0091e206, 0x00474570,
|
|
0x00e42fd5, 0x003288a3, 0x00126a82, 0x00c4cdf4, 0x0053aec0, 0x008509b6, 0x00a5eb97, 0x00734ce1,
|
|
0x00b83566, 0x006e9210, 0x004e7031, 0x0098d747, 0x000fb473, 0x00d91305, 0x00f9f124, 0x002f5652,
|
|
0x008c3cf7, 0x005a9b81, 0x007a79a0, 0x00acded6, 0x003bbde2, 0x00ed1a94, 0x00cdf8b5, 0x001b5fc3,
|
|
0x00fb4733, 0x002de045, 0x000d0264, 0x00dba512, 0x004cc626, 0x009a6150, 0x00ba8371, 0x006c2407,
|
|
0x00cf4ea2, 0x0019e9d4, 0x00390bf5, 0x00efac83, 0x0078cfb7, 0x00ae68c1, 0x008e8ae0, 0x00582d96,
|
|
0x00935411, 0x0045f367, 0x00651146, 0x00b3b630, 0x0024d504, 0x00f27272, 0x00d29053, 0x00043725,
|
|
0x00a75d80, 0x0071faf6, 0x005118d7, 0x0087bfa1, 0x0010dc95, 0x00c67be3, 0x00e699c2, 0x00303eb4,
|
|
0x002b6177, 0x00fdc601, 0x00dd2420, 0x000b8356, 0x009ce062, 0x004a4714, 0x006aa535, 0x00bc0243,
|
|
0x001f68e6, 0x00c9cf90, 0x00e92db1, 0x003f8ac7, 0x00a8e9f3, 0x007e4e85, 0x005eaca4, 0x00880bd2,
|
|
0x00437255, 0x0095d523, 0x00b53702, 0x00639074, 0x00f4f340, 0x00225436, 0x0002b617, 0x00d41161,
|
|
0x00777bc4, 0x00a1dcb2, 0x00813e93, 0x005799e5, 0x00c0fad1, 0x00165da7, 0x0036bf86, 0x00e018f0,
|
|
0x00ad85dd, 0x007b22ab, 0x005bc08a, 0x008d67fc, 0x001a04c8, 0x00cca3be, 0x00ec419f, 0x003ae6e9,
|
|
0x00998c4c, 0x004f2b3a, 0x006fc91b, 0x00b96e6d, 0x002e0d59, 0x00f8aa2f, 0x00d8480e, 0x000eef78,
|
|
0x00c596ff, 0x00133189, 0x0033d3a8, 0x00e574de, 0x007217ea, 0x00a4b09c, 0x008452bd, 0x0052f5cb,
|
|
0x00f19f6e, 0x00273818, 0x0007da39, 0x00d17d4f, 0x00461e7b, 0x0090b90d, 0x00b05b2c, 0x0066fc5a,
|
|
0x007da399, 0x00ab04ef, 0x008be6ce, 0x005d41b8, 0x00ca228c, 0x001c85fa, 0x003c67db, 0x00eac0ad,
|
|
0x0049aa08, 0x009f0d7e, 0x00bfef5f, 0x00694829, 0x00fe2b1d, 0x00288c6b, 0x00086e4a, 0x00dec93c,
|
|
0x0015b0bb, 0x00c317cd, 0x00e3f5ec, 0x0035529a, 0x00a231ae, 0x007496d8, 0x005474f9, 0x0082d38f,
|
|
0x0021b92a, 0x00f71e5c, 0x00d7fc7d, 0x00015b0b, 0x0096383f, 0x00409f49, 0x00607d68, 0x00b6da1e,
|
|
0x0056c2ee, 0x00806598, 0x00a087b9, 0x007620cf, 0x00e143fb, 0x0037e48d, 0x001706ac, 0x00c1a1da,
|
|
0x0062cb7f, 0x00b46c09, 0x00948e28, 0x0042295e, 0x00d54a6a, 0x0003ed1c, 0x00230f3d, 0x00f5a84b,
|
|
0x003ed1cc, 0x00e876ba, 0x00c8949b, 0x001e33ed, 0x008950d9, 0x005ff7af, 0x007f158e, 0x00a9b2f8,
|
|
0x000ad85d, 0x00dc7f2b, 0x00fc9d0a, 0x002a3a7c, 0x00bd5948, 0x006bfe3e, 0x004b1c1f, 0x009dbb69,
|
|
0x0086e4aa, 0x005043dc, 0x0070a1fd, 0x00a6068b, 0x003165bf, 0x00e7c2c9, 0x00c720e8, 0x0011879e,
|
|
0x00b2ed3b, 0x00644a4d, 0x0044a86c, 0x00920f1a, 0x00056c2e, 0x00d3cb58, 0x00f32979, 0x00258e0f,
|
|
0x00eef788, 0x003850fe, 0x0018b2df, 0x00ce15a9, 0x0059769d, 0x008fd1eb, 0x00af33ca, 0x007994bc,
|
|
0x00dafe19, 0x000c596f, 0x002cbb4e, 0x00fa1c38, 0x006d7f0c, 0x00bbd87a, 0x009b3a5b, 0x004d9d2d
|
|
};
|
|
|
|
#define GOOD_CRC24 0x0c91b6
|
|
#define INIT_CRC24 0xffffff
|
|
|
|
guint32 crc_calc(guint32 fcs, guchar *cp, int len)
|
|
{
|
|
while (len--)
|
|
fcs = (fcs >> 8) ^ tbl_crc24[(fcs ^ *cp++) & 0xff];
|
|
return fcs;
|
|
}
|
|
|
|
/* Code to actually dissect the packets */
|
|
static void
|
|
dissect_llcgprs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint8 addr_fld=0, sapi=0, ctrl_fld_fb=0, frame_format, tmp=0 ;
|
|
guint16 offset=0 , epm = 0, nu=0,ctrl_fld_ui_s=0,crc_start=0 ;
|
|
proto_item *ti, *addres_field_item, *ctrl_field_item, *ui_ti;
|
|
proto_tree *llcgprs_tree=NULL , *ad_f_tree =NULL, *ctrl_f_tree=NULL, *ui_tree=NULL;
|
|
tvbuff_t *next_tvb;
|
|
guint32 fcs , fcs_calc;
|
|
guchar *data;
|
|
/* Make entries in Protocol column and Info column on summary display */
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "GPRS-LLC");
|
|
|
|
crc_start = tvb_length(tvb)-3;
|
|
addr_fld = tvb_get_guint8(tvb,offset);
|
|
offset++;
|
|
if (addr_fld > 128 ) {
|
|
if (check_col(pinfo->cinfo,COL_INFO))
|
|
col_add_str(pinfo->cinfo,COL_INFO,"Invalid packet - Protocol Discriminator bit is set to 1");
|
|
return;
|
|
}
|
|
sapi = addr_fld & 0xF;
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "SAPI: %s", match_strval(sapi,sapi_abrv));
|
|
|
|
|
|
data = (guchar*)tvb_get_ptr(tvb, 0, crc_start+3 );
|
|
fcs_calc = crc_calc ( INIT_CRC24 , data , crc_start );
|
|
fcs_calc = ~fcs_calc;
|
|
|
|
if ( memcmp ( &fcs_calc , data+crc_start , 3 ) == 0 )
|
|
fcs = GOOD_CRC24;
|
|
else
|
|
fcs = ~GOOD_CRC24;
|
|
|
|
/* In the interest of speed, if "tree" is NULL, don't do any work not
|
|
necessary to generate protocol tree items. */
|
|
if (tree) {
|
|
|
|
ti = proto_tree_add_protocol_format(tree, proto_llcgprs, tvb, 0, -1,"MS-SGSN LLC (Mobile Station - Serving GPRS Support Node Logical Link Control) SAPI: %s", match_strval(sapi,sapi_t));
|
|
|
|
llcgprs_tree = proto_item_add_subtree(ti, ett_llcgprs);
|
|
|
|
/* add an item to the subtree, see section 1.6 for more information */
|
|
if ( fcs == GOOD_CRC24 )
|
|
proto_tree_add_text ( llcgprs_tree , tvb , crc_start , 3 , "FCS: 0x%06x (correct)" , fcs_calc&0xffffff );
|
|
else
|
|
proto_tree_add_text ( llcgprs_tree , tvb , crc_start , 3 , "FCS: 0x%02x%02x%02x (incorrect, should be 0x%06x)",
|
|
data[crc_start] , data[crc_start+1], data[crc_start+2], fcs_calc & 0xffffff );
|
|
addres_field_item = proto_tree_add_uint_format(llcgprs_tree,hf_llcgprs_sapi,
|
|
tvb, 0,1, sapi, "Address field SAPI: %s", match_strval(sapi,sapi_abrv));
|
|
ad_f_tree = proto_item_add_subtree(addres_field_item, ett_llcgprs_adf);
|
|
proto_tree_add_boolean(ad_f_tree, hf_llcgprs_pd, tvb,0,1, addr_fld );
|
|
proto_tree_add_boolean(ad_f_tree, hf_llcgprs_cr, tvb,0,1, addr_fld );
|
|
proto_tree_add_uint(ad_f_tree, hf_llcgprs_sapib, tvb, 0, 1, addr_fld );
|
|
}
|
|
|
|
|
|
|
|
ctrl_fld_fb = tvb_get_guint8(tvb,offset);
|
|
if ( ctrl_fld_fb < 0xc0 ){
|
|
frame_format = ( ctrl_fld_fb < 0x80)? I_FORMAT : S_FORMAT;
|
|
}
|
|
else {
|
|
frame_format = ( ctrl_fld_fb < 0xe0 )? UI_FORMAT : U_FORMAT;
|
|
}
|
|
switch (frame_format){
|
|
case I_FORMAT:
|
|
if (check_col(pinfo->cinfo,COL_INFO)){
|
|
col_append_str(pinfo->cinfo,COL_INFO, ", I");
|
|
}
|
|
|
|
break;
|
|
case S_FORMAT:
|
|
case UI_FORMAT:
|
|
nu = ctrl_fld_ui_s = tvb_get_ntohs(tvb, offset);
|
|
offset +=2;
|
|
epm = ctrl_fld_ui_s & 0x3;
|
|
nu = (nu >>2)&0x01FF;
|
|
if (frame_format == S_FORMAT){
|
|
if (check_col(pinfo->cinfo, COL_INFO)){
|
|
col_append_str(pinfo->cinfo, COL_INFO, ", S, ");
|
|
col_append_str(pinfo->cinfo, COL_INFO, match_strval(epm,cr_formats_ipluss));
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", N(R) = %u", nu);
|
|
}
|
|
if (tree){
|
|
ctrl_field_item = proto_tree_add_text(llcgprs_tree, tvb, offset-2,2,"Supervisory format: %s: N(R) = %u",match_strval(epm,cr_formats_ipluss), nu);
|
|
ctrl_f_tree = proto_item_add_subtree( ctrl_field_item, ett_llcgprs_sframe);
|
|
proto_tree_add_uint( ctrl_f_tree, hf_llcgprs_S_fmt, tvb, offset-2,2, ctrl_fld_ui_s );
|
|
proto_tree_add_boolean( ctrl_f_tree, hf_llcgprs_As, tvb, offset-2, 2, ctrl_fld_ui_s );
|
|
proto_tree_add_uint(ctrl_f_tree, hf_llcgprs_NR, tvb, offset-2, 2, ctrl_fld_ui_s );
|
|
proto_tree_add_uint(ctrl_f_tree, hf_llcgprs_sjsd, tvb, offset-2, 2, ctrl_fld_ui_s );
|
|
}
|
|
}else{
|
|
/*UI format*/
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_str(pinfo->cinfo, COL_INFO, ", UI, ");
|
|
col_append_str(pinfo->cinfo, COL_INFO, match_strval(epm, pme ));
|
|
col_append_fstr(pinfo->cinfo,COL_INFO, ", N(U) = %u", nu);
|
|
}
|
|
if (tree){
|
|
ctrl_field_item = proto_tree_add_text(llcgprs_tree, tvb, offset-2, 2, "Unnumbered Information format - UI, N(U) = %u", nu);
|
|
ctrl_f_tree = proto_item_add_subtree(ctrl_field_item, ett_llcgprs_ctrlf);
|
|
proto_tree_add_uint( ctrl_f_tree, hf_llcgprs_U_fmt, tvb, offset-2, 2, ctrl_fld_ui_s);
|
|
proto_tree_add_uint( ctrl_f_tree, hf_llcgprs_sp_bits, tvb, offset-2,2,ctrl_fld_ui_s);
|
|
proto_tree_add_uint( ctrl_f_tree, hf_llcgprs_NU, tvb, offset-2, 2, ctrl_fld_ui_s);
|
|
proto_tree_add_boolean( ctrl_f_tree, hf_llcgprs_E_bit, tvb, offset-2,2,ctrl_fld_ui_s);
|
|
proto_tree_add_boolean( ctrl_f_tree, hf_llcgprs_PM_bit, tvb, offset-2,2,ctrl_fld_ui_s);
|
|
}
|
|
|
|
|
|
next_tvb = tvb_new_subset(tvb, offset,crc_start-3, -1 );
|
|
if ((ignore_cipher_bit && (fcs == GOOD_CRC24)) || !(epm & 0x2)){
|
|
/*
|
|
* Either we're ignoring the cipher bit
|
|
* (because the bit is set but the
|
|
* data is unciphered), or the cipher
|
|
* bit isn't set (indicating that the
|
|
* data is unciphered). Try dissecting
|
|
* it with a subdissector.
|
|
*/
|
|
if (!dissector_try_port(llcgprs_subdissector_table,sapi, next_tvb, pinfo, tree))
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
}
|
|
else call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
}
|
|
break;
|
|
case U_FORMAT:
|
|
offset +=1;
|
|
tmp = 0;
|
|
tmp = ctrl_fld_fb & 0xf;
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_str(pinfo->cinfo, COL_INFO, ", U, ");
|
|
col_append_str(pinfo->cinfo, COL_INFO, val_to_str(tmp, cr_formats_unnumb,"Unknown/invalid code:%X"));
|
|
}
|
|
if(tree){
|
|
ui_ti = proto_tree_add_text(llcgprs_tree,tvb,offset-1,crc_start-1,"Unnumbered frame: %s",val_to_str(tmp,cr_formats_unnumb,"Unknown/invalid code:%X"));
|
|
ui_tree = proto_item_add_subtree( ui_ti, ett_ui);
|
|
proto_tree_add_uint( ui_tree, hf_llcgprs_Un, tvb, offset-1, 1, ctrl_fld_fb);
|
|
proto_tree_add_boolean( ui_tree, hf_llcgprs_PF, tvb, offset-1, 1, ctrl_fld_fb);
|
|
proto_tree_add_uint( ui_tree, hf_llcgprs_ucom, tvb, offset-1, 1, ctrl_fld_fb);
|
|
}
|
|
break;
|
|
/* case I_SACK:
|
|
break;
|
|
case S_SACK:
|
|
break;
|
|
*/
|
|
}
|
|
/* proto_tree_add_item(llcgprs_tree,
|
|
hf_llcgprs_FIELDABBREV, tvb, offset, len, FALSE)
|
|
*/
|
|
/* Continue adding tree items to process the packet here */
|
|
|
|
|
|
|
|
/* If this protocol has a sub-dissector call it here, see section 1.8 */
|
|
}
|
|
|
|
|
|
/* Register the protocol with Ethereal */
|
|
|
|
/* this format is require because a script is used to build the C function
|
|
that calls all the protocol registration.
|
|
*/
|
|
|
|
void
|
|
proto_register_llcgprs(void)
|
|
{
|
|
|
|
/* Setup list of header fields See Section 1.6.1 for details*/
|
|
static hf_register_info hf[] = {
|
|
{ &hf_llcgprs_sapi,
|
|
{ "SAPI", "llcgprs.sapi", FT_UINT8, BASE_DEC, VALS(sapi_abrv), 0x0,"Service Access Point Identifier", HFILL }},
|
|
{ &hf_llcgprs_pd,
|
|
{ "Protocol Discriminator_bit", "llcgprs.pd", FT_BOOLEAN,8, TFS(&pd_bit), 0x80, " Protocol Discriminator bit (should be 0)", HFILL }},
|
|
{&hf_llcgprs_sjsd,
|
|
{ "Supervisory function bits","llcgprs.s1s2", FT_UINT16, BASE_HEX, VALS(cr_formats_ipluss),0x3, "Supervisory functions bits",HFILL }},
|
|
{ &hf_llcgprs_cr,
|
|
{ "Command/Response bit", "llcgprs.cr", FT_BOOLEAN, 8, TFS(&cr_bit), 0x40, " Command/Response bit", HFILL}},
|
|
{ &hf_llcgprs_sapib,
|
|
{ "SAPI", "llcgprs.sapib", FT_UINT8, BASE_DEC , VALS(sapi_t), 0xf, "Service Access Point Identifier ",HFILL }},
|
|
{ &hf_llcgprs_U_fmt,
|
|
{ "UI format", "llcgprs.ui", FT_UINT16, BASE_HEX, NULL, UI_MASK_FMT, "UI frame format",HFILL}},
|
|
{ &hf_llcgprs_Un,
|
|
{ "U format", "llcgprs.u", FT_UINT8, BASE_DEC, NULL, 0xe0, " U frame format", HFILL}},
|
|
{ &hf_llcgprs_sp_bits,
|
|
{ "Spare bits", "llcgprs.ui_sp_bit", FT_UINT16, BASE_HEX, NULL, UI_MASK_SPB, "Spare bits", HFILL}},
|
|
{ &hf_llcgprs_NU,
|
|
{ "N(U)", "llcgprs.nu", FT_UINT16, BASE_DEC, NULL, UI_MASK_NU, "Transmited unconfirmed sequence number", HFILL}},
|
|
{ &hf_llcgprs_E_bit,
|
|
{ "E bit", "llcgprs.e", FT_BOOLEAN, 16, TFS(&e_bit), UI_MASK_E,"Encryption mode bit",HFILL }},
|
|
{ &hf_llcgprs_PM_bit,
|
|
{ "PM bit", "llcgprs.pm", FT_BOOLEAN, 16, TFS(&pm_bit), UI_MASK_PM, "Protected mode bit",HFILL}},
|
|
{ &hf_llcgprs_As,
|
|
{ "Ackn request bit", "llcgprs.as", FT_BOOLEAN, 16, TFS(&a_bit), 0x2000 ,"Acknowledgement request bit A", HFILL}},
|
|
{ &hf_llcgprs_PF,
|
|
{ "P/F bit", "llcgprs.pf", FT_BOOLEAN, 8, NULL, 0x10,"Poll /Finall bit", HFILL}},
|
|
{ &hf_llcgprs_ucom,
|
|
{ "Command/Response","llcgprs.ucom", FT_UINT8, BASE_HEX, VALS(cr_formats_unnumb),0xf,"Commands and Responses",HFILL }},
|
|
{ &hf_llcgprs_NR,
|
|
{ "Receive sequence number", "llcgprs.nr",FT_UINT16, BASE_DEC, NULL, UI_MASK_NU,"Receive sequence number N(R)",HFILL }},
|
|
{&hf_llcgprs_S_fmt,
|
|
{ "S format", "llcgprs.s", FT_UINT16, BASE_DEC, NULL, 0xc000,"Supervisory format S", HFILL}}
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_llcgprs,
|
|
&ett_llcgprs_adf,
|
|
&ett_llcgprs_ctrlf,
|
|
&ett_ui,
|
|
&ett_llcgprs_sframe,
|
|
};
|
|
|
|
module_t *llcgprs_module;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_llcgprs = proto_register_protocol("Logical Link Control GPRS",
|
|
"GPRS-LLC", "llcgprs");
|
|
llcgprs_subdissector_table = register_dissector_table("llcgprs.sapi","GPRS LLC SAPI", FT_UINT8,BASE_HEX);
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_llcgprs, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
register_dissector( "llcgprs", dissect_llcgprs, proto_llcgprs);
|
|
|
|
llcgprs_module = prefs_register_protocol ( proto_llcgprs, NULL );
|
|
prefs_register_bool_preference ( llcgprs_module, "autodetect_cipher_bit",
|
|
"Autodetect cipher bit",
|
|
"Whether to autodetect the cipher bit (because it might be set on unciphered data)",
|
|
&ignore_cipher_bit );
|
|
}
|
|
|
|
|
|
/* 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_llcgprs(void)
|
|
{
|
|
data_handle = find_dissector("data");
|
|
}
|