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wireshark/epan/dissectors/packet-pw-hdlc.c

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/* packet-pw-hdlc.c
* Routines for HDLC PW dissection as per RFC4618.
* Copyright 2009, Dmitry Trebich, Artem Tamazov <artem.tamazov@tellabs.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
*
* History:
* ---------------------------------
* 02.03.2009 Initial implementation, supports:
* - HDLC mode (rfc4618 5.1), no CW, payload is PPP (PPP in HDLC-like Framing (rfc1662)).
* - FR port mode (rfc4618 5.2), no CW.
*
* [informative: Not supported yet:
* - All kinds of HDLC PW with CW.
* - PPP mode (rfc4618 5.3).
* - For HDLC mode, decoding payloads other than PPP.]
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <glib.h>
#include <epan/packet.h>
#include "packet-mpls.h"
static dissector_handle_t ppp_handle;
static dissector_handle_t fr_handle;
static gint proto_pw_hdlc_nocw_fr = -1;
static gint proto_pw_hdlc_nocw_hdlc_ppp = -1;
static gint ett_pw_hdlc = -1;
static int hf_pw_hdlc = -1;
static int hf_pw_hdlc_address_field = -1;
static int hf_pw_hdlc_address = -1;
static int hf_pw_hdlc_cr_bit = -1;
static int hf_pw_hdlc_control_field = -1;
static int hf_pw_hdlc_pf_bit = -1;
static void dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
{
call_dissector( fr_handle, tvb, pinfo, tree );
}
static void dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
{
if (tvb_reported_length_remaining(tvb, 0) < 2)
{
if (tree)
{
proto_tree_add_text(tree, tvb, 0, -1, "Error processing message");
}
return;
}
if (tree)
{
proto_tree *tr;
proto_item *item;
proto_item *item_address;
proto_item *item_control;
guint8 addr;
guint8 control;
addr = tvb_get_guint8(tvb, 0);
control = tvb_get_guint8(tvb, 1);
item = proto_tree_add_item( tree, proto_pw_hdlc_nocw_hdlc_ppp, tvb, 0, 2, ENC_NA );
tr = proto_item_add_subtree( item, ett_pw_hdlc );
item_address = proto_tree_add_uint( tr, hf_pw_hdlc_address_field, tvb, 0, 1, addr );
item_control = proto_tree_add_uint_format( tr, hf_pw_hdlc_control_field, tvb, 1, 1, control, "Control field: 0x%x", control );
tr = proto_item_add_subtree( item_address, ett_pw_hdlc );
if ( 0x3F == (( addr & 0xFC ) >> 2 ))
proto_tree_add_uint_format( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "Address: 0x%x (All stations)", 0x3F );
else
proto_tree_add_uint( tr, hf_pw_hdlc_address, tvb, 0, 1, ( addr & 0xFC ) >> 2 );
proto_tree_add_uint( tr, hf_pw_hdlc_cr_bit, tvb, 0, 1, ( addr & 2 ) >> 1 );
tr = proto_item_add_subtree( item_control, ett_pw_hdlc );
if ( control & 1 )
{
if ( control & 2 )
{
guint8 modifier2;
guint8 modifier3;
proto_tree_add_text( tr, tvb, 1, 1, "U frame" );
proto_tree_add_uint( tr, hf_pw_hdlc_pf_bit, tvb, 1, 1, ( control & 0x10 ) >> 4 );
modifier2 = (( control & 0xC ) >> 2 );
modifier3 = (( control & 0xE0 ) >> 5 );
/**/ if ( modifier2 == 0 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UI - Unnumbered information" );
else if ( modifier2 == 0 && modifier3 == 1 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UP - Unnumbered poll" );
else if ( modifier2 == 0 && modifier3 == 2 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: DISC/RD - Disconnect/Request disconnect" );
else if ( modifier2 == 0 && modifier3 == 3 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UA - Unnumbered acknowledgment" );
else if ( modifier2 == 0 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SNRM - Set normal response mode" );
else if ( modifier2 == 0 && modifier3 == 7 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: TEST - Test" );
else if ( modifier2 == 1 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SIM/RIM"
" - Set initialization mode/Request initialization mode" );
else if ( modifier2 == 1 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: FRMR - Frame reject" );
else if ( modifier2 == 3 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SARM/DM"
" - Set asynchronous response mode/Disconnect mode" );
else if ( modifier2 == 3 && modifier3 == 1 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SABM - Set asynchronous balanced mode" );
else if ( modifier2 == 3 && modifier3 == 2 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SARME - Set asynchronous response extended mode" );
else if ( modifier2 == 3 && modifier3 == 3 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SABME - Set asynchronous balanced extended mode" );
else if ( modifier2 == 3 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: RSET - Reset" );
else if ( modifier2 == 3 && modifier3 == 5 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: XID - Exchange identification" );
else if ( modifier2 == 3 && modifier3 == 6 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SNRME - Set normal response extended mode" );
}
else
{
proto_tree_add_text( tr, tvb, 1, 1, "S frame" );
}
}
else
{
proto_tree_add_text( tr, tvb, 1, 1, "I frame" );
}
}
call_dissector( ppp_handle, tvb_new_subset_remaining(tvb, 2), pinfo, tree );
}
void proto_register_pw_hdlc(void)
{
static hf_register_info hf[] = {
{
&hf_pw_hdlc,
{
"PW HDLC", "pw_hdlc", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_address_field,
{
"Address field", "pw_hdlc.address_field",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_address,
{
"Address", "pw_hdlc.address",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_cr_bit,
{
"C/R bit", "pw_hdlc.cr_bit",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_control_field,
{
"Control field", "pw_hdlc.control_field",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_pf_bit,
{
"Poll/Final bit", "pw_hdlc.pf_bit",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
}
}
};
static gint *ett[] = {
&ett_pw_hdlc
};
proto_pw_hdlc_nocw_fr = proto_register_protocol("HDLC PW, FR port mode (no CW)", /*not displayed*/
"HDLC PW, FR port mode (no CW)",
"pw_hdlc_nocw_fr" );
proto_pw_hdlc_nocw_hdlc_ppp = proto_register_protocol("HDLC-like framing for PPP",
"HDLC PW with PPP payload (no CW)",
"pw_hdlc_nocw_hdlc_ppp" );
proto_register_field_array(proto_pw_hdlc_nocw_fr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr );
register_dissector("pw_hdlc_nocw_hdlc_ppp", dissect_pw_hdlc_nocw_hdlc_ppp, proto_pw_hdlc_nocw_hdlc_ppp );
}
void proto_reg_handoff_pw_hdlc(void)
{
dissector_handle_t handle;
handle = find_dissector("pw_hdlc_nocw_fr");
dissector_add_uint( "mpls.label", LABEL_INVALID, handle );
handle = find_dissector("pw_hdlc_nocw_hdlc_ppp");
dissector_add_uint( "mpls.label", LABEL_INVALID, handle );
ppp_handle = find_dissector( "ppp" );
fr_handle = find_dissector( "fr" );
}
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