![Bill Meier](/assets/img/avatar_default.png)
packet-mpls.c: - refactor dissect_pw_ach(); - create/uer value_string_ext as appropriate; - use call_dissector() rather than direct dissector call in one cse; all: - use 'LABEL' prefix for a set of rather generic enum identifiers; - fix some cases of calling expert...() or sub-dissectors under 'if(tree)'; - reformat some hf[] entries; - do some whitespace changes. svn path=/trunk/; revision=45195
259 lines
7.8 KiB
C
259 lines
7.8 KiB
C
/* packet-pw-hdlc.c
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* Routines for HDLC PW dissection as per RFC4618.
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* Copyright 2009, Dmitry Trebich, Artem Tamazov <artem.tamazov@tellabs.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* History:
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* ---------------------------------
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* 02.03.2009 Initial implementation, supports:
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* - HDLC mode (rfc4618 5.1), no CW, payload is PPP (PPP in HDLC-like Framing (rfc1662)).
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* - FR port mode (rfc4618 5.2), no CW.
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*
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* [informative: Not supported yet:
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* - All kinds of HDLC PW with CW.
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* - PPP mode (rfc4618 5.3).
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* - For HDLC mode, decoding payloads other than PPP.]
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-mpls.h"
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static dissector_handle_t ppp_handle;
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static dissector_handle_t fr_handle;
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static gint proto_pw_hdlc_nocw_fr = -1;
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static gint proto_pw_hdlc_nocw_hdlc_ppp = -1;
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static gint ett_pw_hdlc = -1;
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static int hf_pw_hdlc = -1;
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static int hf_pw_hdlc_address_field = -1;
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static int hf_pw_hdlc_address = -1;
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static int hf_pw_hdlc_cr_bit = -1;
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static int hf_pw_hdlc_control_field = -1;
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static int hf_pw_hdlc_pf_bit = -1;
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static void dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
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{
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call_dissector( fr_handle, tvb, pinfo, tree );
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}
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static void dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
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{
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if (tvb_reported_length_remaining(tvb, 0) < 2)
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{
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if (tree)
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{
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proto_tree_add_text(tree, tvb, 0, -1, "Error processing message");
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}
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return;
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}
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if (tree)
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{
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proto_tree *tr;
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proto_item *item;
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proto_item *item_address;
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proto_item *item_control;
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guint8 addr;
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guint8 control;
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addr = tvb_get_guint8(tvb, 0);
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control = tvb_get_guint8(tvb, 1);
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item = proto_tree_add_item( tree, proto_pw_hdlc_nocw_hdlc_ppp, tvb, 0, 2, ENC_NA );
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tr = proto_item_add_subtree( item, ett_pw_hdlc );
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item_address = proto_tree_add_uint( tr, hf_pw_hdlc_address_field, tvb, 0, 1, addr );
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item_control = proto_tree_add_uint_format( tr, hf_pw_hdlc_control_field, tvb, 1, 1, control, "Control field: 0x%x", control );
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tr = proto_item_add_subtree( item_address, ett_pw_hdlc );
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if ( 0x3F == (( addr & 0xFC ) >> 2 ))
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proto_tree_add_uint_format( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "Address: 0x%x (All stations)", 0x3F );
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else
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proto_tree_add_uint( tr, hf_pw_hdlc_address, tvb, 0, 1, ( addr & 0xFC ) >> 2 );
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proto_tree_add_uint( tr, hf_pw_hdlc_cr_bit, tvb, 0, 1, ( addr & 2 ) >> 1 );
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tr = proto_item_add_subtree( item_control, ett_pw_hdlc );
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if ( control & 1 )
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{
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if ( control & 2 )
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{
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guint8 modifier2;
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guint8 modifier3;
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proto_tree_add_text( tr, tvb, 1, 1, "U frame" );
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proto_tree_add_uint( tr, hf_pw_hdlc_pf_bit, tvb, 1, 1, ( control & 0x10 ) >> 4 );
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modifier2 = (( control & 0xC ) >> 2 );
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modifier3 = (( control & 0xE0 ) >> 5 );
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/**/ if ( modifier2 == 0 && modifier3 == 0 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: UI - Unnumbered information" );
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else if ( modifier2 == 0 && modifier3 == 1 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: UP - Unnumbered poll" );
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else if ( modifier2 == 0 && modifier3 == 2 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: DISC/RD - Disconnect/Request disconnect" );
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else if ( modifier2 == 0 && modifier3 == 3 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: UA - Unnumbered acknowledgment" );
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else if ( modifier2 == 0 && modifier3 == 4 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SNRM - Set normal response mode" );
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else if ( modifier2 == 0 && modifier3 == 7 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: TEST - Test" );
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else if ( modifier2 == 1 && modifier3 == 0 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SIM/RIM"
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" - Set initialization mode/Request initialization mode" );
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else if ( modifier2 == 1 && modifier3 == 4 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: FRMR - Frame reject" );
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else if ( modifier2 == 3 && modifier3 == 0 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SARM/DM"
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" - Set asynchronous response mode/Disconnect mode" );
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else if ( modifier2 == 3 && modifier3 == 1 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SABM - Set asynchronous balanced mode" );
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else if ( modifier2 == 3 && modifier3 == 2 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SARME - Set asynchronous response extended mode" );
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else if ( modifier2 == 3 && modifier3 == 3 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SABME - Set asynchronous balanced extended mode" );
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else if ( modifier2 == 3 && modifier3 == 4 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: RSET - Reset" );
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else if ( modifier2 == 3 && modifier3 == 5 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: XID - Exchange identification" );
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else if ( modifier2 == 3 && modifier3 == 6 )
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proto_tree_add_text( tr, tvb, 1, 1,
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"Modifier: SNRME - Set normal response extended mode" );
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}
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else
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{
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proto_tree_add_text( tr, tvb, 1, 1, "S frame" );
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}
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}
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else
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{
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proto_tree_add_text( tr, tvb, 1, 1, "I frame" );
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}
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}
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call_dissector( ppp_handle, tvb_new_subset_remaining(tvb, 2), pinfo, tree );
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}
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void proto_register_pw_hdlc(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_pw_hdlc,
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{
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"PW HDLC", "pw_hdlc", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_address_field,
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{
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"Address field", "pw_hdlc.address_field",
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FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_address,
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{
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"Address", "pw_hdlc.address",
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FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_cr_bit,
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{
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"C/R bit", "pw_hdlc.cr_bit",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_control_field,
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{
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"Control field", "pw_hdlc.control_field",
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FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_pf_bit,
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{
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"Poll/Final bit", "pw_hdlc.pf_bit",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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}
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};
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static gint *ett[] = {
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&ett_pw_hdlc
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};
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proto_pw_hdlc_nocw_fr = proto_register_protocol("HDLC PW, FR port mode (no CW)", /*not displayed*/
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"HDLC PW, FR port mode (no CW)",
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"pw_hdlc_nocw_fr" );
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proto_pw_hdlc_nocw_hdlc_ppp = proto_register_protocol("HDLC-like framing for PPP",
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"HDLC PW with PPP payload (no CW)",
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"pw_hdlc_nocw_hdlc_ppp" );
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proto_register_field_array(proto_pw_hdlc_nocw_fr, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr );
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register_dissector("pw_hdlc_nocw_hdlc_ppp", dissect_pw_hdlc_nocw_hdlc_ppp, proto_pw_hdlc_nocw_hdlc_ppp );
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}
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void proto_reg_handoff_pw_hdlc(void)
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{
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dissector_handle_t handle;
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handle = find_dissector("pw_hdlc_nocw_fr");
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dissector_add_uint( "mpls.label", MPLS_LABEL_INVALID, handle );
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handle = find_dissector("pw_hdlc_nocw_hdlc_ppp");
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dissector_add_uint( "mpls.label", MPLS_LABEL_INVALID, handle );
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ppp_handle = find_dissector( "ppp" );
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fr_handle = find_dissector( "fr" );
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}
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