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/* packet-maap.c
* Routines for 802.3 MAC Address Allocation Protocol defined by IEEE1722
* Copyright 2012, Jason Damori, Biamp Systems <jdamori at biamp dot com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/to_str.h>
void proto_register_maap(void);
void proto_reg_handoff_maap(void);
static dissector_handle_t maap_handle;
/* MAAP starts after common 1722 header */
#define MAAP_START_OFFSET 1
/* MAAP Field Offsets */
#define MAAP_MSG_TYPE_OFFSET 0+MAAP_START_OFFSET
#define MAAP_VERSION_OFFSET 1+MAAP_START_OFFSET
#define MAAP_STREAM_ID_OFFSET 3+MAAP_START_OFFSET
#define MAAP_REQ_START_ADDR_OFFSET 11+MAAP_START_OFFSET
#define MAAP_REQ_COUNT_OFFSET 17+MAAP_START_OFFSET
#define MAAP_CONFLICT_START_ADDR_OFFSET 19+MAAP_START_OFFSET
#define MAAP_CONFLICT_COUNT_OFFSET 25+MAAP_START_OFFSET
/* Bit Field Masks */
#define MAAP_MSG_TYPE_MASK 0x0f
#define MAAP_VERSION_MASK 0xf8
#define MAAP_DATA_LEN_MASK 0x07ff
/* MAAP message_type */
#define MAAP_MSG_TYPE_RESERVED_0 0x00
#define MAAP_MSG_TYPE_PROBE 0x01
#define MAAP_MSG_TYPE_DEFEND 0x02
#define MAAP_MSG_TYPE_ANNOUNCE 0x03
#define MAAP_MSG_TYPE_RESERVED_4 0x04
#define MAAP_MSG_TYPE_RESERVED_5 0x05
static const value_string maap_msg_type_vals [] = {
{MAAP_MSG_TYPE_PROBE, "MAAP_PROBE"},
{MAAP_MSG_TYPE_DEFEND, "MAAP_DEFEND"},
{MAAP_MSG_TYPE_ANNOUNCE, "MAAP_ANNOUNCE"},
{0, NULL}
};
/**********************************************************/
/* Initialize the protocol and registered fields */
/**********************************************************/
static int proto_maap = -1;
/* MAAP PDU */
static int hf_maap_message_type = -1;
static int hf_maap_version = -1;
static int hf_maap_data_length = -1;
static int hf_maap_stream_id = -1;
static int hf_maap_req_start_addr = -1;
static int hf_maap_req_count = -1;
static int hf_maap_conflict_start_addr = -1;
static int hf_maap_conflict_count = -1;
/* Initialize the subtree pointers */
static int ett_maap = -1;
static int
dissect_maap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint8 maap_msg_type;
proto_item *maap_item = NULL;
proto_tree *maap_tree = NULL;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAAP");
col_clear(pinfo->cinfo, COL_INFO);
/* The maap msg type will be handy in a moment */
maap_msg_type = tvb_get_guint8(tvb, MAAP_MSG_TYPE_OFFSET);
maap_msg_type &= 0x0f;
/* Display the name of the packet type in the info column. */
col_add_fstr(pinfo->cinfo, COL_INFO, "%s:",
val_to_str(maap_msg_type, maap_msg_type_vals,
"Unknown Type(0x%02x)"));
/* Now, we'll add the start and conflict addresses and counts to the info column as appropriate */
switch (maap_msg_type)
{
case MAAP_MSG_TYPE_PROBE:
case MAAP_MSG_TYPE_ANNOUNCE:
col_append_fstr(pinfo->cinfo, COL_INFO, " req_start=%s, cnt=%d",
tvb_ether_to_str(pinfo->pool, tvb, MAAP_REQ_START_ADDR_OFFSET),
tvb_get_ntohs(tvb, MAAP_REQ_COUNT_OFFSET));
break;
case MAAP_MSG_TYPE_DEFEND:
col_append_fstr(pinfo->cinfo, COL_INFO, " conflict_start=%s, cnt=%d",
tvb_ether_to_str(pinfo->pool, tvb, MAAP_CONFLICT_START_ADDR_OFFSET),
tvb_get_ntohs(tvb, MAAP_CONFLICT_COUNT_OFFSET));
break;
default:
/* no info for reserved or unknown msg types */
break;
}
if (tree) {
maap_item = proto_tree_add_item(tree, proto_maap, tvb, MAAP_START_OFFSET, -1, ENC_NA);
maap_tree = proto_item_add_subtree(maap_item, ett_maap);
proto_tree_add_item(maap_tree, hf_maap_message_type, tvb, MAAP_MSG_TYPE_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(maap_tree, hf_maap_version, tvb, MAAP_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(maap_tree, hf_maap_data_length, tvb, MAAP_VERSION_OFFSET, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(maap_tree, hf_maap_stream_id, tvb, MAAP_STREAM_ID_OFFSET, 8, ENC_BIG_ENDIAN);
proto_tree_add_item(maap_tree, hf_maap_req_start_addr, tvb, MAAP_REQ_START_ADDR_OFFSET, 6, ENC_NA);
proto_tree_add_item(maap_tree, hf_maap_req_count, tvb, MAAP_REQ_COUNT_OFFSET, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(maap_tree, hf_maap_conflict_start_addr, tvb, MAAP_CONFLICT_START_ADDR_OFFSET, 6, ENC_NA);
proto_tree_add_item(maap_tree, hf_maap_conflict_count, tvb, MAAP_CONFLICT_COUNT_OFFSET, 2, ENC_BIG_ENDIAN);
}
return tvb_captured_length(tvb);
} /* end dissect_maap() */
/* Register the protocol with Wireshark */
void
proto_register_maap(void)
{
static hf_register_info hf[] = {
{ &hf_maap_message_type,
{ "Message Type", "maap.message_type",
FT_UINT8, BASE_HEX,
VALS(maap_msg_type_vals), MAAP_MSG_TYPE_MASK,
NULL, HFILL }},
{ &hf_maap_version,
{ "MAAP Version", "maap.version",
FT_UINT8, BASE_HEX,
NULL, MAAP_VERSION_MASK,
NULL, HFILL }},
{ &hf_maap_data_length,
{ "Data Length", "maap.data_length",
FT_UINT16, BASE_HEX,
NULL, MAAP_DATA_LEN_MASK,
NULL, HFILL }},
{ &hf_maap_stream_id,
{ "Stream ID", "maap.stream_id",
FT_UINT64, BASE_HEX,
NULL, 0x00,
NULL, HFILL }},
{ &hf_maap_req_start_addr,
{ "Requested Start Address", "maap.req_start_addr",
FT_ETHER, BASE_NONE,
NULL, 0x00,
NULL, HFILL }},
{ &hf_maap_req_count,
{ "Request Count", "maap.req_count",
FT_UINT16, BASE_HEX,
NULL, 0x00,
NULL, HFILL }},
{ &hf_maap_conflict_start_addr,
{ "Conflict Start Address", "maap.conflict_start_addr",
FT_ETHER, BASE_NONE,
NULL, 0x00,
NULL, HFILL }},
{ &hf_maap_conflict_count,
{ "Conflict Count", "maap.conflict_count",
FT_UINT16, BASE_HEX,
NULL, 0x00,
NULL, HFILL }}
}; /* end of static hf_register_info hf[] = */
/* Setup protocol subtree array */
static gint *ett[] = { &ett_maap };
/* Register the protocol name and description */
proto_maap = proto_register_protocol (
"IEEE 1722 MAAP Protocol", /* name */
"MAAP", /* short name */
"maap" /* abbrev */
);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_maap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register the dissector */
maap_handle = register_dissector("maap", dissect_maap, proto_maap);
} /* end proto_register_maap() */
void
proto_reg_handoff_maap(void)
{
dissector_add_uint("ieee1722.subtype", 0xFE, maap_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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