forked from osmocom/wireshark
3551a86c36
svn path=/trunk/; revision=45015
280 lines
8.4 KiB
C
280 lines
8.4 KiB
C
/* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
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*
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* $Id$
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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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#include "config.h"
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#include <epan/packet.h>
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#define IUC_REQUEST 1
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#define IUC_REQ_DATA 2
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#define IUC_INIT_MAINT 3
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#define IUC_STATION_MAINT 4
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#define IUC_SHORT_DATA_GRANT 5
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#define IUC_LONG_DATA_GRANT 6
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#define IUC_NULL_IE 7
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#define IUC_DATA_ACK 8
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#define IUC_RESERVED9 9
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#define IUC_RESERVED10 10
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#define IUC_RESERVED11 11
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#define IUC_RESERVED12 12
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#define IUC_RESERVED13 13
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#define IUC_RESERVED14 14
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#define IUC_EXPANSION 15
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/* Initialize the protocol and registered fields */
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static int proto_docsis_map = -1;
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static int hf_docsis_map_upstream_chid = -1;
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static int hf_docsis_map_ucd_count = -1;
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static int hf_docsis_map_numie = -1;
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static int hf_docsis_map_alloc_start = -1;
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static int hf_docsis_map_ack_time = -1;
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static int hf_docsis_map_rng_start = -1;
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static int hf_docsis_map_rng_end = -1;
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static int hf_docsis_map_data_start = -1;
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static int hf_docsis_map_data_end = -1;
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static int hf_docsis_map_ie = -1;
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static int hf_docsis_map_rsvd = -1;
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static int hf_docsis_map_sid = -1;
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static int hf_docsis_map_iuc = -1;
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static int hf_docsis_map_offset = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_map = -1;
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/* Defined in packet-ucd.c */
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extern value_string iuc_vals[];
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/* Code to actually dissect the packets */
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static void
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dissect_map (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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guint8 i, numie;
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int pos;
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guint16 sid;
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guint8 iuc;
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guint16 offset;
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guint32 ie, temp, mask;
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proto_item *it, *item;
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proto_tree *map_tree;
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guint8 upchid, ucd_count;
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numie = tvb_get_guint8 (tvb, 2);
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upchid = tvb_get_guint8 (tvb, 0);
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ucd_count = tvb_get_guint8 (tvb, 1);
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col_clear (pinfo->cinfo, COL_INFO);
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if (upchid > 0)
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col_add_fstr (pinfo->cinfo, COL_INFO,
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"Map Message: Channel ID = %u (U%u), UCD Count = %u, # IE's = %u",
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upchid, upchid - 1, ucd_count, numie);
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else
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col_add_fstr (pinfo->cinfo, COL_INFO,
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"Map Message: Channel ID = %u (Telephony Return), UCD Count = %u, # IE's = %u",
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upchid, ucd_count, numie);
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if (tree)
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{
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it =
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proto_tree_add_protocol_format (tree, proto_docsis_map, tvb, 0, -1,
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"MAP Message");
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map_tree = proto_item_add_subtree (it, ett_docsis_map);
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proto_tree_add_item (map_tree, hf_docsis_map_upstream_chid, tvb, 0, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_ucd_count, tvb, 1, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_numie, tvb, 2, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_rsvd, tvb, 3, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_alloc_start, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_ack_time, tvb, 8, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_rng_start, tvb, 12, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_rng_end, tvb, 13, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_data_start, tvb, 14, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (map_tree, hf_docsis_map_data_end, tvb, 15, 1,
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ENC_BIG_ENDIAN);
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pos = 16;
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for (i = 0; i < numie; i++)
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{
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ie = tvb_get_ntohl (tvb, pos);
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mask = 0xFFFC0000;
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temp = (ie & mask);
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temp = temp >> 18;
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sid = (guint16) (temp & 0x3FFF);
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mask = 0x3C000;
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temp = (ie & mask);
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temp = temp >> 14;
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iuc = (guint8) (temp & 0x0F);
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mask = 0x3FFF;
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offset = (guint16) (ie & mask);
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item = proto_tree_add_item(map_tree, hf_docsis_map_sid, tvb, pos, 4, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_HIDDEN(item);
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item = proto_tree_add_item(map_tree, hf_docsis_map_iuc, tvb, pos, 4, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_HIDDEN(item);
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item = proto_tree_add_item(map_tree, hf_docsis_map_offset, tvb, pos, 4, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_HIDDEN(item);
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if (sid == 0x3FFF)
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proto_tree_add_uint_format (map_tree, hf_docsis_map_ie, tvb, pos, 4,
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ie, "SID = 0x%x (All CM's), IUC = %s, Offset = %u",
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sid, val_to_str (iuc, iuc_vals, "%d"),
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offset);
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else
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proto_tree_add_uint_format (map_tree, hf_docsis_map_ie, tvb, pos, 4,
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ie, "SID = %u, IUC = %s, Offset = %u",
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sid, val_to_str (iuc, iuc_vals, "%d"),
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offset);
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pos = pos + 4;
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} /* for... */
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} /* if(tree) */
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}
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/* Register the protocol with Wireshark */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_docsis_map (void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{&hf_docsis_map_ucd_count,
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{"UCD Count", "docsis_map.ucdcount",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Map UCD Count", HFILL}
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},
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{&hf_docsis_map_upstream_chid,
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{"Upstream Channel ID", "docsis_map.upchid",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_numie,
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{"Number of IE's", "docsis_map.numie",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Number of Information Elements", HFILL}
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},
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{&hf_docsis_map_alloc_start,
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{"Alloc Start Time (minislots)", "docsis_map.allocstart",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_ack_time,
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{"ACK Time (minislots)", "docsis_map.acktime",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_rng_start,
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{"Ranging Backoff Start", "docsis_map.rng_start",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_rng_end,
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{"Ranging Backoff End", "docsis_map.rng_end",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_data_start,
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{"Data Backoff Start", "docsis_map.data_start",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_data_end,
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{"Data Backoff End", "docsis_map.data_end",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_ie,
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{"Information Element", "docsis_map.ie",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_map_rsvd,
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{"Reserved [0x00]", "docsis_map.rsvd",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Reserved Byte", HFILL}
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},
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{&hf_docsis_map_sid,
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{"Service Identifier", "docsis_map.sid",
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FT_UINT32, BASE_DEC, NULL, 0xFFFC0000,
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NULL, HFILL}
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},
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{&hf_docsis_map_iuc,
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{"Interval Usage Code", "docsis_map.iuc",
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FT_UINT32, BASE_DEC, VALS(iuc_vals), 0x0003c000,
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NULL, HFILL}
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},
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{&hf_docsis_map_offset,
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{"Offset", "docsis_map.offset",
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FT_UINT32, BASE_DEC, NULL, 0x00003fff,
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NULL, HFILL}
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_docsis_map,
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};
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/* Register the protocol name and description */
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proto_docsis_map =
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proto_register_protocol ("DOCSIS Upstream Bandwidth Allocation",
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"DOCSIS MAP", "docsis_map");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array (proto_docsis_map, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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register_dissector ("docsis_map", dissect_map, proto_docsis_map);
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_docsis_map (void)
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{
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dissector_handle_t docsis_map_handle;
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docsis_map_handle = find_dissector ("docsis_map");
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dissector_add_uint ("docsis_mgmt", 0x03, docsis_map_handle);
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}
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