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Change-Id: I857700d685354b0bc9e0ca647c57faba981b520f Reviewed-on: https://code.wireshark.org/review/4373 Reviewed-by: Bill Meier <wmeier@newsguy.com>
231 lines
8.2 KiB
C
231 lines
8.2 KiB
C
/* packet-maap.c
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* Routines for 802.3 MAC Address Allocation Protocol defined by IEEE1722
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* Copyright 2012, Jason Damori, Biamp Systems <jdamori at biamp dot 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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#include <epan/etypes.h>
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void proto_register_maap(void);
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void proto_reg_handoff_maap(void);
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/* MAAP starts after common 1722 header */
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#define MAAP_START_OFFSET 1
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/* MAAP Field Offsets */
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#define MAAP_MSG_TYPE_OFFSET 0+MAAP_START_OFFSET
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#define MAAP_VERSION_OFFSET 1+MAAP_START_OFFSET
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#define MAAP_STREAM_ID_OFFSET 3+MAAP_START_OFFSET
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#define MAAP_REQ_START_ADDR_OFFSET 11+MAAP_START_OFFSET
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#define MAAP_REQ_COUNT_OFFSET 17+MAAP_START_OFFSET
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#define MAAP_CONFLICT_START_ADDR_OFFSET 19+MAAP_START_OFFSET
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#define MAAP_CONFLICT_COUNT_OFFSET 25+MAAP_START_OFFSET
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/* Bit Field Masks */
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#define MAAP_MSG_TYPE_MASK 0x0f
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#define MAAP_VERSION_MASK 0xf8
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#define MAAP_DATA_LEN_MASK 0x07ff
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/* MAAP message_type */
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#define MAAP_MSG_TYPE_RESERVED_0 0x00
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#define MAAP_MSG_TYPE_PROBE 0x01
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#define MAAP_MSG_TYPE_DEFEND 0x02
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#define MAAP_MSG_TYPE_ANNOUNCE 0x03
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#define MAAP_MSG_TYPE_RESERVED_4 0x04
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#define MAAP_MSG_TYPE_RESERVED_5 0x05
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static const value_string maap_msg_type_vals [] = {
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{MAAP_MSG_TYPE_PROBE, "MAAP_PROBE"},
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{MAAP_MSG_TYPE_DEFEND, "MAAP_DEFEND"},
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{MAAP_MSG_TYPE_ANNOUNCE, "MAAP_ANNOUNCE"},
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{0, NULL}
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};
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/**********************************************************/
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/* Initialize the protocol and registered fields */
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/**********************************************************/
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static int proto_maap = -1;
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/* MAAP PDU */
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static int hf_maap_message_type = -1;
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static int hf_maap_version = -1;
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static int hf_maap_data_length = -1;
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static int hf_maap_stream_id = -1;
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static int hf_maap_req_start_addr = -1;
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static int hf_maap_req_count = -1;
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static int hf_maap_conflict_start_addr = -1;
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static int hf_maap_conflict_count = -1;
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/* Initialize the subtree pointers */
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static int ett_maap = -1;
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static void
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dissect_maap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 maap_msg_type;
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proto_item *maap_item = NULL;
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proto_tree *maap_tree = NULL;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAAP");
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col_clear(pinfo->cinfo, COL_INFO);
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/* The maap msg type will be handy in a moment */
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maap_msg_type = tvb_get_guint8(tvb, MAAP_MSG_TYPE_OFFSET);
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maap_msg_type &= 0x0f;
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/* Display the name of the packet type in the info column. */
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s:",
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val_to_str(maap_msg_type, maap_msg_type_vals,
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"Unknown Type(0x%02x)"));
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/* Now, we'll add the start and conflict addresses and counts to the info column as appropriate */
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switch (maap_msg_type)
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{
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case MAAP_MSG_TYPE_PROBE:
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case MAAP_MSG_TYPE_ANNOUNCE:
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col_append_fstr(pinfo->cinfo, COL_INFO, " req_start=%s, cnt=%d",
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tvb_ether_to_str(tvb, MAAP_REQ_START_ADDR_OFFSET),
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tvb_get_ntohs(tvb, MAAP_REQ_COUNT_OFFSET));
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break;
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case MAAP_MSG_TYPE_DEFEND:
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col_append_fstr(pinfo->cinfo, COL_INFO, " conflict_start=%s, cnt=%d",
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tvb_ether_to_str(tvb, MAAP_CONFLICT_START_ADDR_OFFSET),
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tvb_get_ntohs(tvb, MAAP_CONFLICT_COUNT_OFFSET));
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break;
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default:
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/* no info for reserved or unknown msg types */
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break;
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}
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if (tree) {
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maap_item = proto_tree_add_item(tree, proto_maap, tvb, MAAP_START_OFFSET, -1, ENC_NA);
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maap_tree = proto_item_add_subtree(maap_item, ett_maap);
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proto_tree_add_item(maap_tree, hf_maap_message_type, tvb, MAAP_MSG_TYPE_OFFSET, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(maap_tree, hf_maap_version, tvb, MAAP_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(maap_tree, hf_maap_data_length, tvb, MAAP_VERSION_OFFSET, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(maap_tree, hf_maap_stream_id, tvb, MAAP_STREAM_ID_OFFSET, 8, ENC_BIG_ENDIAN);
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proto_tree_add_item(maap_tree, hf_maap_req_start_addr, tvb, MAAP_REQ_START_ADDR_OFFSET, 6, ENC_NA);
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proto_tree_add_item(maap_tree, hf_maap_req_count, tvb, MAAP_REQ_COUNT_OFFSET, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(maap_tree, hf_maap_conflict_start_addr, tvb, MAAP_CONFLICT_START_ADDR_OFFSET, 6, ENC_NA);
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proto_tree_add_item(maap_tree, hf_maap_conflict_count, tvb, MAAP_CONFLICT_COUNT_OFFSET, 2, ENC_BIG_ENDIAN);
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}
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} /* end dissect_maap() */
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/* Register the protocol with Wireshark */
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void
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proto_register_maap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_maap_message_type,
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{ "Message Type", "maap.message_type",
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FT_UINT8, BASE_HEX,
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VALS(maap_msg_type_vals), MAAP_MSG_TYPE_MASK,
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NULL, HFILL }},
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{ &hf_maap_version,
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{ "MAAP Version", "maap.version",
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FT_UINT8, BASE_HEX,
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NULL, MAAP_VERSION_MASK,
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NULL, HFILL }},
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{ &hf_maap_data_length,
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{ "Data Length", "maap.data_length",
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FT_UINT16, BASE_HEX,
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NULL, MAAP_DATA_LEN_MASK,
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NULL, HFILL }},
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{ &hf_maap_stream_id,
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{ "Stream ID", "maap.stream_id",
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FT_UINT64, BASE_HEX,
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NULL, 0x00,
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NULL, HFILL }},
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{ &hf_maap_req_start_addr,
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{ "Requested Start Address", "maap.req_start_addr",
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FT_ETHER, BASE_NONE,
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NULL, 0x00,
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NULL, HFILL }},
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{ &hf_maap_req_count,
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{ "Request Count", "maap.req_count",
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FT_UINT16, BASE_HEX,
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NULL, 0x00,
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NULL, HFILL }},
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{ &hf_maap_conflict_start_addr,
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{ "Conflict Start Address", "maap.conflict_start_addr",
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FT_ETHER, BASE_NONE,
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NULL, 0x00,
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NULL, HFILL }},
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{ &hf_maap_conflict_count,
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{ "Conflict Count", "maap.conflict_count",
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FT_UINT16, BASE_HEX,
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NULL, 0x00,
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NULL, HFILL }}
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}; /* end of static hf_register_info hf[] = */
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/* Setup protocol subtree array */
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static gint *ett[] = { &ett_maap };
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/* Register the protocol name and description */
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proto_maap = proto_register_protocol (
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"IEEE 1722 MAAP Protocol", /* name */
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"MAAP", /* short name */
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"maap" /* abbrev */
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);
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_maap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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} /* end proto_register_maap() */
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void
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proto_reg_handoff_maap(void)
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{
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dissector_handle_t maap_handle;
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maap_handle = create_dissector_handle(dissect_maap, proto_maap);
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dissector_add_uint("ieee1722.subtype", 0x7E, maap_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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