forked from osmocom/wireshark
237 lines
6.5 KiB
C
237 lines
6.5 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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 <epan/packet.h>
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void proto_register_pw_hdlc(void);
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void proto_reg_handoff_pw_hdlc(void);
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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 dissector_handle_t pw_hdlc_nocw_fr_handle;
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static dissector_handle_t pw_ppp_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 int hf_pw_hdlc_modifier = -1;
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static int hf_pw_hdlc_frame = -1;
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static const value_string pw_hdlc_modifier_vals[] = {
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{0x00, "UI - Unnumbered information" },
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{0x08, "UP - Unnumbered poll" },
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{0x10, "DISC/RD - Disconnect/Request disconnect" },
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{0x18, "UA - Unnumbered acknowledgment" },
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{0x20, "SNRM - Set normal response mode" },
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{0x38, "TEST - Test" },
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{0x01, "SIM/RIM - Set initialization mode/Request initialization mode" },
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{0x21, "FRMR - Frame reject" },
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{0x03, "SARM/DM - Set asynchronous response mode/Disconnect mode" },
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{0x0B, "SABM - Set asynchronous balanced mode" },
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{0x13, "SARME - Set asynchronous response extended mode" },
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{0x1B, "SABME - Set asynchronous balanced extended mode" },
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{0x23, "RSET - Reset" },
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{0x2B, "XID - Exchange identification" },
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{0x33, "SNRME - Set normal response extended mode" },
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{0, NULL }
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};
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static int dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_ )
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{
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return call_dissector( fr_handle, tvb, pinfo, tree );
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}
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static int dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_ )
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{
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if (tvb_reported_length_remaining(tvb, 0) < 2)
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{
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return 0;
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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_item( tr, hf_pw_hdlc_address_field, tvb, 0, 1, ENC_BIG_ENDIAN );
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item_control = proto_tree_add_item( tr, hf_pw_hdlc_control_field, tvb, 1, 1, ENC_BIG_ENDIAN );
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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_value( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "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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proto_tree_add_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "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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proto_tree_add_uint( tr, hf_pw_hdlc_modifier, tvb, 1, 1, (control & 0xEC) >> 2);
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}
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else
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{
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proto_tree_add_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "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_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "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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return tvb_captured_length(tvb);
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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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#if 0
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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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#endif
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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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&hf_pw_hdlc_modifier,
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{
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"Modifier", "pw_hdlc.modifier",
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FT_UINT8, BASE_HEX, VALS(pw_hdlc_modifier_vals), 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_hdlc_frame,
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{
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"Frame type", "pw_hdlc.frame",
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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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pw_hdlc_nocw_fr_handle = register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr );
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pw_ppp_handle = 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_add_for_decode_as( "mpls.label", pw_hdlc_nocw_fr_handle );
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dissector_add_for_decode_as( "mpls.label", pw_ppp_handle );
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ppp_handle = find_dissector_add_dependency( "ppp", proto_pw_hdlc_nocw_hdlc_ppp );
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fr_handle = find_dissector_add_dependency( "fr", proto_pw_hdlc_nocw_fr );
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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