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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>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* 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.]
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_pw_hdlc(void);
void proto_reg_handoff_pw_hdlc(void);
static dissector_handle_t ppp_handle;
static dissector_handle_t fr_handle;
static dissector_handle_t pw_hdlc_nocw_fr_handle;
static dissector_handle_t pw_ppp_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 int hf_pw_hdlc_modifier = -1;
static int hf_pw_hdlc_frame = -1;
static const value_string pw_hdlc_modifier_vals[] = {
{0x00, "UI - Unnumbered information" },
{0x08, "UP - Unnumbered poll" },
{0x10, "DISC/RD - Disconnect/Request disconnect" },
{0x18, "UA - Unnumbered acknowledgment" },
{0x20, "SNRM - Set normal response mode" },
{0x38, "TEST - Test" },
{0x01, "SIM/RIM - Set initialization mode/Request initialization mode" },
{0x21, "FRMR - Frame reject" },
{0x03, "SARM/DM - Set asynchronous response mode/Disconnect mode" },
{0x0B, "SABM - Set asynchronous balanced mode" },
{0x13, "SARME - Set asynchronous response extended mode" },
{0x1B, "SABME - Set asynchronous balanced extended mode" },
{0x23, "RSET - Reset" },
{0x2B, "XID - Exchange identification" },
{0x33, "SNRME - Set normal response extended mode" },
{0, NULL }
};
static int dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_ )
{
return call_dissector( fr_handle, tvb, pinfo, tree );
}
static int dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_ )
{
if (tvb_reported_length_remaining(tvb, 0) < 2)
{
return 0;
}
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_item( tr, hf_pw_hdlc_address_field, tvb, 0, 1, ENC_BIG_ENDIAN );
item_control = proto_tree_add_item( tr, hf_pw_hdlc_control_field, tvb, 1, 1, ENC_BIG_ENDIAN );
tr = proto_item_add_subtree( item_address, ett_pw_hdlc );
if ( 0x3F == (( addr & 0xFC ) >> 2 ))
proto_tree_add_uint_format_value( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "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 )
{
proto_tree_add_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "U frame" );
proto_tree_add_uint( tr, hf_pw_hdlc_pf_bit, tvb, 1, 1, ( control & 0x10 ) >> 4 );
proto_tree_add_uint( tr, hf_pw_hdlc_modifier, tvb, 1, 1, (control & 0xEC) >> 2);
}
else
{
proto_tree_add_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "S frame" );
}
}
else
{
proto_tree_add_uint_format( tr, hf_pw_hdlc_frame, tvb, 1, 1, control, "I frame" );
}
}
call_dissector( ppp_handle, tvb_new_subset_remaining(tvb, 2), pinfo, tree );
return tvb_captured_length(tvb);
}
void proto_register_pw_hdlc(void)
{
static hf_register_info hf[] = {
#if 0
{
&hf_pw_hdlc,
{
"PW HDLC", "pw_hdlc", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
#endif
{
&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
}
},
{
&hf_pw_hdlc_modifier,
{
"Modifier", "pw_hdlc.modifier",
FT_UINT8, BASE_HEX, VALS(pw_hdlc_modifier_vals), 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_frame,
{
"Frame type", "pw_hdlc.frame",
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));
pw_hdlc_nocw_fr_handle = register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr );
pw_ppp_handle = 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_add_for_decode_as( "mpls.label", pw_hdlc_nocw_fr_handle );
dissector_add_for_decode_as( "mpls.label", pw_ppp_handle );
ppp_handle = find_dissector_add_dependency( "ppp", proto_pw_hdlc_nocw_hdlc_ppp );
fr_handle = find_dissector_add_dependency( "fr", proto_pw_hdlc_nocw_fr );
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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