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Diffstat (limited to 'epan/dissectors/packet-bofl.c')
| -rw-r--r-- | epan/dissectors/packet-bofl.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/epan/dissectors/packet-bofl.c b/epan/dissectors/packet-bofl.c new file mode 100644 index 00000000..35f3122d --- /dev/null +++ b/epan/dissectors/packet-bofl.c @@ -0,0 +1,168 @@ +/* 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); + +static dissector_handle_t bofl_handle; + +/* 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)); + + bofl_handle = register_dissector("bofl", dissect_bofl, proto_bofl); +} + + +void +proto_reg_handoff_bofl(void) +{ + 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: + */ |