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wireshark/plugins/docsis/packet-map.c

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/* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#define IUC_REQUEST 1
#define IUC_REQ_DATA 2
#define IUC_INIT_MAINT 3
#define IUC_STATION_MAINT 4
#define IUC_SHORT_DATA_GRANT 5
#define IUC_LONG_DATA_GRANT 6
#define IUC_NULL_IE 7
#define IUC_DATA_ACK 8
#define IUC_RESERVED9 9
#define IUC_RESERVED10 10
#define IUC_RESERVED11 11
#define IUC_RESERVED12 12
#define IUC_RESERVED13 13
#define IUC_RESERVED14 14
#define IUC_EXPANSION 15
void proto_register_docsis_map(void);
void proto_reg_handoff_docsis_map(void);
/* Initialize the protocol and registered fields */
static int proto_docsis_map = -1;
static int hf_docsis_map_upstream_chid = -1;
static int hf_docsis_map_ucd_count = -1;
static int hf_docsis_map_numie = -1;
static int hf_docsis_map_alloc_start = -1;
static int hf_docsis_map_ack_time = -1;
static int hf_docsis_map_rng_start = -1;
static int hf_docsis_map_rng_end = -1;
static int hf_docsis_map_data_start = -1;
static int hf_docsis_map_data_end = -1;
static int hf_docsis_map_ie = -1;
static int hf_docsis_map_rsvd = -1;
static int hf_docsis_map_sid = -1;
static int hf_docsis_map_iuc = -1;
static int hf_docsis_map_offset = -1;
/* Initialize the subtree pointers */
static gint ett_docsis_map = -1;
/* Defined in packet-ucd.c */
extern value_string iuc_vals[];
/* Code to actually dissect the packets */
static void
dissect_map (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
guint8 i, numie;
int pos;
guint16 sid;
guint8 iuc;
guint16 offset;
guint32 ie, temp, mask;
proto_item *it, *item;
proto_tree *map_tree;
guint8 upchid, ucd_count;
numie = tvb_get_guint8 (tvb, 2);
upchid = tvb_get_guint8 (tvb, 0);
ucd_count = tvb_get_guint8 (tvb, 1);
if (upchid > 0)
col_add_fstr (pinfo->cinfo, COL_INFO,
"Map Message: Channel ID = %u (U%u), UCD Count = %u, # IE's = %u",
upchid, upchid - 1, ucd_count, numie);
else
col_add_fstr (pinfo->cinfo, COL_INFO,
"Map Message: Channel ID = %u (Telephony Return), UCD Count = %u, # IE's = %u",
upchid, ucd_count, numie);
if (tree)
{
it =
proto_tree_add_protocol_format (tree, proto_docsis_map, tvb, 0, -1,
"MAP Message");
map_tree = proto_item_add_subtree (it, ett_docsis_map);
proto_tree_add_item (map_tree, hf_docsis_map_upstream_chid, tvb, 0, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_ucd_count, tvb, 1, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_numie, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_rsvd, tvb, 3, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_alloc_start, tvb, 4, 4,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_ack_time, tvb, 8, 4,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_rng_start, tvb, 12, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_rng_end, tvb, 13, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_data_start, tvb, 14, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item (map_tree, hf_docsis_map_data_end, tvb, 15, 1,
ENC_BIG_ENDIAN);
pos = 16;
for (i = 0; i < numie; i++)
{
ie = tvb_get_ntohl (tvb, pos);
mask = 0xFFFC0000;
temp = (ie & mask);
temp = temp >> 18;
sid = (guint16) (temp & 0x3FFF);
mask = 0x3C000;
temp = (ie & mask);
temp = temp >> 14;
iuc = (guint8) (temp & 0x0F);
mask = 0x3FFF;
offset = (guint16) (ie & mask);
item = proto_tree_add_item(map_tree, hf_docsis_map_sid, tvb, pos, 4, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(item);
item = proto_tree_add_item(map_tree, hf_docsis_map_iuc, tvb, pos, 4, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(item);
item = proto_tree_add_item(map_tree, hf_docsis_map_offset, tvb, pos, 4, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(item);
if (sid == 0x3FFF)
proto_tree_add_uint_format (map_tree, hf_docsis_map_ie, tvb, pos, 4,
ie, "SID = 0x%x (All CM's), IUC = %s, Offset = %u",
sid, val_to_str (iuc, iuc_vals, "%d"),
offset);
else
proto_tree_add_uint_format (map_tree, hf_docsis_map_ie, tvb, pos, 4,
ie, "SID = %u, IUC = %s, Offset = %u",
sid, val_to_str (iuc, iuc_vals, "%d"),
offset);
pos = pos + 4;
} /* for... */
} /* if(tree) */
}
/* Register the protocol with Wireshark */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_docsis_map (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{&hf_docsis_map_ucd_count,
{"UCD Count", "docsis_map.ucdcount",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Map UCD Count", HFILL}
},
{&hf_docsis_map_upstream_chid,
{"Upstream Channel ID", "docsis_map.upchid",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_numie,
{"Number of IE's", "docsis_map.numie",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Number of Information Elements", HFILL}
},
{&hf_docsis_map_alloc_start,
{"Alloc Start Time (minislots)", "docsis_map.allocstart",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_ack_time,
{"ACK Time (minislots)", "docsis_map.acktime",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_rng_start,
{"Ranging Backoff Start", "docsis_map.rng_start",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_rng_end,
{"Ranging Backoff End", "docsis_map.rng_end",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_data_start,
{"Data Backoff Start", "docsis_map.data_start",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_data_end,
{"Data Backoff End", "docsis_map.data_end",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_ie,
{"Information Element", "docsis_map.ie",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_map_rsvd,
{"Reserved [0x00]", "docsis_map.rsvd",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Reserved Byte", HFILL}
},
{&hf_docsis_map_sid,
{"Service Identifier", "docsis_map.sid",
FT_UINT32, BASE_DEC, NULL, 0xFFFC0000,
NULL, HFILL}
},
{&hf_docsis_map_iuc,
{"Interval Usage Code", "docsis_map.iuc",
FT_UINT32, BASE_DEC, VALS(iuc_vals), 0x0003c000,
NULL, HFILL}
},
{&hf_docsis_map_offset,
{"Offset", "docsis_map.offset",
FT_UINT32, BASE_DEC, NULL, 0x00003fff,
NULL, HFILL}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_docsis_map,
};
/* Register the protocol name and description */
proto_docsis_map =
proto_register_protocol ("DOCSIS Upstream Bandwidth Allocation",
"DOCSIS MAP", "docsis_map");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array (proto_docsis_map, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector ("docsis_map", dissect_map, proto_docsis_map);
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_docsis_map (void)
{
dissector_handle_t docsis_map_handle;
docsis_map_handle = find_dissector ("docsis_map");
dissector_add_uint ("docsis_mgmt", 0x03, docsis_map_handle);
}
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