b8455a821b
svn path=/trunk/; revision=36951
340 lines
12 KiB
C
340 lines
12 KiB
C
/* packet-bmc.c
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* Routines for Broadcast/Multicast Control dissection
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* Copyright 2011, Neil Piercy <Neil.Piercy@ipaccess.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <string.h>
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#include <epan/bitswap.h>
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#include <epan/packet.h>
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static int dissect_bmc_cbs_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_bmc_schedule_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_bmc_cbs41_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int proto_bmc = -1;
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static int hf_bmc_message_type = -1;
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static int hf_bmc_message_id = -1;
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static int hf_bmc_serial_number = -1;
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static int hf_bmc_data_coding_scheme = -1;
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static int hf_bmc_cb_data = -1;
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static int hf_bmc_offset_to_begin_ctch_bs_index = -1;
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static int hf_bmc_length_of_cbs_schedule_period = -1;
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static int hf_bmc_new_message_bitmap = -1;
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static int hf_bmc_message_description_type = -1;
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static int hf_bmc_offset_to_ctch_bs_index_of_first_transmission = -1;
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static int hf_bmc_broadcast_address = -1;
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static int hf_bmc_cb_data41 = -1;
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static int hf_bmc_future_extension_bitmap = -1;
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static int hf_bmc_length_of_serial_number_list = -1;
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static int hf_bmc_ctch_bs_index = -1;
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#define MESSAGE_TYPE_CBS_MESSAGE 1
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#define MESSAGE_TYPE_SCHEDULE_MESSAGE 2
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#define MESSAGE_TYPE_CBS41_MESSAGE 3
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static const value_string message_type_vals[] = {
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{MESSAGE_TYPE_CBS_MESSAGE, "CBS Message"},
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{MESSAGE_TYPE_SCHEDULE_MESSAGE, "Schedule Message"},
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{MESSAGE_TYPE_CBS41_MESSAGE, "CBS41 Message"},
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{0, NULL}
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};
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static const value_string message_description_type_vals[] = {
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{0, "Repetition of new BMC CBS message within schedule period"},
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{1, "New BMC CBS message (a BMC CBS message never previously sent)"},
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{2, "Reading advised"},
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{3, "Reading optional"},
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{4, "Repetition of old BMC CBS message within schedule period"},
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{5, "Old BMC CBS message (repetition of a BMC CBS message sent in a previous schedule period)"},
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{6, "Schedule message"},
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{7, "CBS41 message"},
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{8, "no message"},
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{0, NULL}
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};
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static gint ett_bmc = -1;
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static gint ett_bmc_message_description = -1;
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static int
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dissect_bmc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 message_type;
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guint8 *p_rev, *reversing_buffer;
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gint offset = 0;
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gint i, len;
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proto_item *ti;
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proto_tree *bmc_tree;
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tvbuff_t *bit_reversed_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BMC");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_bmc, tvb, 0, -1, ENC_NA);
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bmc_tree = proto_item_add_subtree(ti, ett_bmc);
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/* Needs bit-reversing. Create a new buffer, copy the message to it and bit-reverse */
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len = tvb_length(tvb);
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reversing_buffer = se_alloc(len);
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memcpy(reversing_buffer, tvb_get_ptr(tvb, offset, -1), len);
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p_rev = reversing_buffer;
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/* Entire message is bit reversed */
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for (i=0; i<len; i++, p_rev++)
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*p_rev = BIT_SWAP(*p_rev);
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/* Make this new buffer part of the display and provide a way to dispose of it */
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bit_reversed_tvb = tvb_new_real_data(reversing_buffer, len, len);
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tvb_set_child_real_data_tvbuff(tvb, bit_reversed_tvb);
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add_new_data_source(pinfo, bit_reversed_tvb, "Bit-reversed Data");
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message_type = tvb_get_guint8(bit_reversed_tvb, offset);
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proto_tree_add_item(bmc_tree, hf_bmc_message_type, bit_reversed_tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str(message_type, message_type_vals,"Reserved 0x%02x"));
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switch (message_type) {
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case MESSAGE_TYPE_CBS_MESSAGE:
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offset = dissect_bmc_cbs_message(bit_reversed_tvb, pinfo, bmc_tree);
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break;
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case MESSAGE_TYPE_SCHEDULE_MESSAGE:
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offset = dissect_bmc_schedule_message(bit_reversed_tvb, pinfo, bmc_tree);
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break;
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case MESSAGE_TYPE_CBS41_MESSAGE:
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offset = dissect_bmc_cbs41_message(bit_reversed_tvb, pinfo, bmc_tree);
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break;
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default:
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break;
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}
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return offset;
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}
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static int
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dissect_bmc_cbs_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset=1;
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proto_tree_add_item(tree, hf_bmc_message_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_bmc_serial_number, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_bmc_data_coding_scheme, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_bmc_cb_data, tvb, offset, tvb_length_remaining(tvb,offset), ENC_BIG_ENDIAN);
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offset = tvb_length(tvb);
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return offset;
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}
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static int
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dissect_bmc_schedule_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset=1, i, saved_offset;
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guint8 new_message_bitmap_len;
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guint8 length_of_cbs_schedule_period;
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guint8 message_description_type;
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guint8 future_extension_bitmap;
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guint8 length_of_serial_number_list;
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guint8 entry;
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guint8 mask, bit;
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proto_tree *message_description_tree;
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proto_item *ti;
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proto_tree_add_item(tree, hf_bmc_offset_to_begin_ctch_bs_index, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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length_of_cbs_schedule_period = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(tree, hf_bmc_length_of_cbs_schedule_period, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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new_message_bitmap_len = length_of_cbs_schedule_period>>3;
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if (length_of_cbs_schedule_period & 0x7)
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new_message_bitmap_len += 1;
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proto_tree_add_item(tree, hf_bmc_new_message_bitmap, tvb, offset, new_message_bitmap_len, ENC_BIG_ENDIAN);
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offset += new_message_bitmap_len;
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ti = proto_tree_add_text(tree, tvb, offset, 0, "Message Description" );
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message_description_tree = proto_item_add_subtree(ti, ett_bmc_message_description);
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saved_offset = offset;
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bit=1;
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for (i=0; i<new_message_bitmap_len; i++) {
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for(mask=1; bit<=length_of_cbs_schedule_period; mask<<=1, bit++) {
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message_description_type = tvb_get_guint8(tvb,offset);
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proto_tree_add_uint_format(message_description_tree, hf_bmc_message_description_type, tvb, offset, 1, message_description_type, "Message %d Message Description Type: %s (%d)", bit, val_to_str(message_description_type, message_description_type_vals,"Unknown"), message_description_type);
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offset += 1;
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if ((message_description_type==1) || (message_description_type==5)) {
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proto_tree_add_item(message_description_tree, hf_bmc_message_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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}
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else if ((message_description_type==0) || (message_description_type==4)) {
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proto_tree_add_item(message_description_tree, hf_bmc_offset_to_ctch_bs_index_of_first_transmission, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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}
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}
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}
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proto_item_set_len(ti, offset-saved_offset);
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if (tvb_length_remaining(tvb,offset)) {
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future_extension_bitmap = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(tree, hf_bmc_future_extension_bitmap, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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if (future_extension_bitmap & 0x01) {
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length_of_serial_number_list = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(tree, hf_bmc_length_of_serial_number_list, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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for (entry=0; entry<length_of_serial_number_list; entry++) {
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proto_tree_add_item(tree, hf_bmc_serial_number, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_bmc_ctch_bs_index, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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}
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}
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}
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return offset;
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}
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static int
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dissect_bmc_cbs41_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset=1;
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proto_tree_add_item(tree, hf_bmc_broadcast_address, tvb, offset, 5, ENC_BIG_ENDIAN);
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offset += 5;
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proto_tree_add_item(tree, hf_bmc_cb_data41, tvb, offset, tvb_length_remaining(tvb,offset), ENC_BIG_ENDIAN);
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offset = tvb_length(tvb);
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return offset;
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}
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void
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proto_register_bmc(void)
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{
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static hf_register_info hf[] = {
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{ &hf_bmc_message_type,
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{ "Message Type", "bmc.message_type",
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FT_UINT8, BASE_DEC, message_type_vals, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_message_id,
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{ "Message ID", "bmc.message_id",
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FT_UINT16, BASE_HEX, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_serial_number,
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{ "Serial Number", "bmc.serial_number",
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FT_UINT16, BASE_HEX, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_data_coding_scheme,
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{ "Data Coding Scheme", "bmc.data_coding_scheme",
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FT_UINT8, BASE_HEX, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_cb_data,
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{ "CB Data", "bmc.cb_data",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_offset_to_begin_ctch_bs_index,
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{ "Offset to Begin CTCH Block Set Index", "bmc.offset_to_begin_ctch_bs_index",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_length_of_cbs_schedule_period,
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{ "Length of CBS Schedule Period", "bmc.length_of_cbs_schedule_period",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_new_message_bitmap,
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{ "New Message Bitmap", "bmc.new_message_bitmap",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_message_description_type,
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{ "Message Description Type", "bmc.message_description_type",
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FT_UINT8, BASE_DEC, message_description_type_vals, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_offset_to_ctch_bs_index_of_first_transmission,
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{ "Offset to CTCH BS index of first transmission", "bmc.offset_to_ctch_bs_index_of_first_transmission",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_broadcast_address,
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{ "Broadcast Address", "bmc.broadcast_address",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_cb_data41,
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{ "CB Data41", "bmc.cb_data41",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_future_extension_bitmap,
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{ "Future Extension Bitmap", "bmc.future_extension_bitmap",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_length_of_serial_number_list,
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{ "Length of Serial Number List", "bmc.length_of_serial_number_list",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{ &hf_bmc_ctch_bs_index,
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{ "CTCH BS Index", "bmc.ctch_bs_index",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_bmc,
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&ett_bmc_message_description
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};
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proto_bmc = proto_register_protocol("Broadcast/Multicast Control", "BMC", "bmc");
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new_register_dissector("bmc", dissect_bmc, proto_bmc);
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proto_register_field_array(proto_bmc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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