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/* packet-bofl.c
* Routines for Wellfleet BOFL dissection
* Wellfleet -> Baynetworks -> Nortel -> Avaya -> Extremenetworks
* Protocol is now called Simple Loop Protection Protocol (SLPP)
* Author: Endoh Akira (endoh@netmarks.co.jp)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* The following information was copied from
* http://web.archive.org/web/20150608035209/http://www.protocols.com/pbook/bridge.htm#WellfleetBOFL
*
* The Wellfleet Breath of Life (BOFL) protocol is used as a line sensing
* protocol on:
*
* - Ethernet LANs to detect transmitter jams.
* - Synchronous lines running WFLT STD protocols to determine if the line
* is up.
* - Dial backup PPP lines.
*
* The frame format of Wellfleet BOFL is shown following the Ethernet header
* in the following illustration:
*
* Destination Source 8102 PDU Sequence Padding
* 6 6 2 4 4 n bytes
*/
/* From the above link:
*
* Wellfleet BOFL
*
* The Wellfleet Breath of Life (BOFL) protocol is used as a line sensing protocol on:
*
* Ethernet LANs to detect transmitter jams.
* Synchronous lines running WFLT STD protocols to determine if the line is up.
* Dial backup PPP lines.
* The frame format of Wellfleet BOFL is shown following the Ethernet header in the following illustration:
*
* Destination | Source |8102 | PDU | Sequence | Padding
* 6 | 6 | 2 | 4 | 4 | n bytes
* <-------------------------->
* Ethernet Header
*
* 8102
* EtherType (0x8102 for Wellfleet BOFL frames).
*
* PDU
* PDU field normally equals 0x01010000, but may equal 0x01011111 in some new releases on synchronous links.
*
* Sequence
* 4-byte sequence field is an incremental counter.
*
* Padding
* Padding to fill out the frame to 64 bytes.
*/
#include "config.h"
#include <epan/packet.h>
#define ETHER_TYPE_SLPP 0x8102
#define BOFL_MIN_LEN 8
void proto_register_bofl(void);
void proto_reg_handoff_bofl(void);
/* Initialize the protocol and registered fields */
static int proto_bofl = -1;
static int hf_bofl_pdu = -1;
static int hf_bofl_sequence = -1;
static int hf_bofl_padding = -1;
/* Initialize the subtree pointers */
static gint ett_bofl = -1;
/* Code to actually dissect the packets */
static int
dissect_bofl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *bofl_tree;
gint len;
guint32 pdu, sequence;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BOFL");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_bofl, tvb, 0, -1, ENC_NA);
bofl_tree = proto_item_add_subtree(ti, ett_bofl);
pdu = tvb_get_ntohl(tvb, 0);
col_add_fstr(pinfo->cinfo, COL_INFO,
"PDU: 0x%08x", pdu);
proto_tree_add_uint(bofl_tree, hf_bofl_pdu, tvb, 0, 4, pdu);
sequence = tvb_get_ntohl(tvb, 4);
col_append_fstr(pinfo->cinfo, COL_INFO,
" Sequence: %u", sequence);
proto_tree_add_uint(bofl_tree, hf_bofl_sequence, tvb, 4, 4, sequence);
len = tvb_reported_length_remaining(tvb, 8);
if (len > 0)
proto_tree_add_item(bofl_tree, hf_bofl_padding, tvb, 8, -1, ENC_NA);
return tvb_captured_length(tvb);
}
void
proto_register_bofl(void)
{
static hf_register_info hf[] = {
{ &hf_bofl_pdu,
{ "PDU", "bofl.pdu",
FT_UINT32, BASE_HEX, NULL, 0,
"PDU; normally equals 0x01010000 or 0x01011111", HFILL }
},
{ &hf_bofl_sequence,
{ "Sequence", "bofl.sequence",
FT_UINT32, BASE_DEC, NULL, 0,
"incremental counter", HFILL }
},
{ &hf_bofl_padding,
{ "Padding", "bofl.padding",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }
}
};
static gint *ett[] = {
&ett_bofl,
};
proto_bofl = proto_register_protocol("Wellfleet Breath of Life",
"BOFL", "bofl");
proto_register_field_array(proto_bofl, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_bofl(void)
{
dissector_handle_t bofl_handle;
bofl_handle = create_dissector_handle(dissect_bofl, proto_bofl);
dissector_add_uint("ethertype", ETHER_TYPE_SLPP, bofl_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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