forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
344 lines
12 KiB
C
344 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <wsutil/bitswap.h>
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#include <epan/asn1.h> /* needed for packet-gsm_map.h */
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#include "packet-cell_broadcast.h"
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#include "packet-gsm_map.h"
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void proto_register_bmc(void);
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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, void *data _U_)
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{
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guint8 message_type;
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guint8 *reversing_buffer;
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gint offset = 0;
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gint 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_reported_length(tvb);
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reversing_buffer = (guint8 *)tvb_memdup(pinfo->pool, tvb, offset, len);
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bitswap_buf_inplace(reversing_buffer, len);
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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_child_real_data(tvb, reversing_buffer, len, len);
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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, proto_tree *tree)
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{
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tvbuff_t *cell_broadcast_tvb;
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gint offset = 1;
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dissect_cbs_message_identifier(tvb, tree, offset);
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offset += 2;
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dissect_cbs_serial_number(tvb, tree, offset);
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offset += 2;
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dissect_cbs_data_coding_scheme(tvb, pinfo, tree, offset);
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offset += 1;
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cell_broadcast_tvb = tvb_new_subset_remaining(tvb, offset);
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dissect_umts_cell_broadcast_message(cell_broadcast_tvb, pinfo, tree, NULL);
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offset = tvb_reported_length(cell_broadcast_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 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_NA);
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offset += new_message_bitmap_len;
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message_description_tree = proto_tree_add_subtree(tree, tvb, offset, 0,
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ett_bmc_message_description, &ti, "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(; bit<=length_of_cbs_schedule_period; 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,
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tvb, offset, 1, message_description_type,
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"Message %d Message Description Type: %s (%d)",
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bit,
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val_to_str_const(message_description_type, message_description_type_vals,"Unknown"),
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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,
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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_reported_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_NA);
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offset += 5;
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proto_tree_add_item(tree, hf_bmc_cb_data41, tvb, offset, tvb_reported_length_remaining(tvb,offset), ENC_NA);
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offset = tvb_reported_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, VALS(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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#if 0
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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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#endif
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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, VALS(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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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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/*
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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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