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wireshark/epan/dissectors/packet-hci_mon.c

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/* packet-hci_mon.c
* Routines for Bluetooth Linux Monitor dissection
*
* Copyright 2013, Michal Labedzki for Tieto Corporation
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <wiretap/wtap.h>
#include "packet-bluetooth.h"
static int proto_hci_mon = -1;
static int hf_adapter_id = -1;
static int hf_opcode = -1;
static int hf_type = -1;
static int hf_bus = -1;
static int hf_bd_addr = -1;
static int hf_name = -1;
static gint ett_hci_mon = -1;
static expert_field ei_unknown_data = EI_INIT;
static wmem_tree_t *adapter_to_disconnect_in_frame = NULL;
static dissector_handle_t hci_mon_handle;
static dissector_handle_t bthci_cmd_handle;
static dissector_handle_t bthci_evt_handle;
static dissector_handle_t bthci_acl_handle;
static dissector_handle_t bthci_sco_handle;
static const value_string opcode_vals[] = {
{ 0x00, "New Index" },
{ 0x01, "Delete Index" },
{ 0x02, "HCI Command Packet" },
{ 0x03, "HCI Event Packet" },
{ 0x04, "ACL Tx Packet" },
{ 0x05, "ACL Rx Packet" },
{ 0x06, "SCO Tx Packet" },
{ 0x07, "SCO Rx Packet" },
{ 0x00, NULL }
};
value_string_ext(hci_mon_opcode_vals_ext) = VALUE_STRING_EXT_INIT(opcode_vals);
static const value_string type_vals[] = {
{ 0x00, "Virtual" },
{ 0x01, "USB" },
{ 0x02, "PC Card" },
{ 0x03, "UART" },
{ 0x04, "RS232" },
{ 0x05, "PCI" },
{ 0x06, "SDIO" },
{ 0x00, NULL }
};
static value_string_ext(type_vals_ext) = VALUE_STRING_EXT_INIT(type_vals);
static const value_string bus_vals[] = {
{ 0x00, "BR/EDR" },
{ 0x01, "AMP" },
{ 0x00, NULL }
};
static value_string_ext(bus_vals_ext) = VALUE_STRING_EXT_INIT(bus_vals);
void proto_register_hci_mon(void);
void proto_reg_handoff_hci_mon(void);
static gint
dissect_hci_mon(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_tree *hci_mon_item;
proto_item *hci_mon_tree;
proto_item *sub_item;
gint offset = 0;
guint16 opcode;
guint16 adapter_id;
bluetooth_data_t *bluetooth_data;
tvbuff_t *next_tvb;
guint32 *adapter_disconnect_in_frame;
wmem_tree_t *subtree;
wmem_tree_key_t key[4];
guint32 k_interface_id;
guint32 k_adapter_id;
guint32 k_frame_number;
bluetooth_data = (bluetooth_data_t *) data;
DISSECTOR_ASSERT(bluetooth_data->previous_protocol_data_type == BT_PD_BTMON);
adapter_id = bluetooth_data->previous_protocol_data.btmon->adapter_id;
opcode = bluetooth_data->previous_protocol_data.btmon->opcode;
if (opcode == 0x00 || opcode == 0x01)
pinfo->p2p_dir = P2P_DIR_RECV;
else if (opcode % 2)
pinfo->p2p_dir = P2P_DIR_RECV;
else
pinfo->p2p_dir = P2P_DIR_SENT;
hci_mon_item = proto_tree_add_item(tree, proto_hci_mon, tvb, offset, tvb_captured_length(tvb), ENC_NA);
hci_mon_tree = proto_item_add_subtree(hci_mon_item, ett_hci_mon);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI_MON");
if (opcode == 0x00 || opcode == 0x01)
col_set_str(pinfo->cinfo, COL_INFO, "Info ");
else switch (pinfo->p2p_dir) {
case P2P_DIR_SENT:
col_set_str(pinfo->cinfo, COL_INFO, "Sent ");
break;
case P2P_DIR_RECV:
col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");
break;
default:
col_set_str(pinfo->cinfo, COL_INFO, "UnknownDirection ");
break;
}
sub_item = proto_tree_add_uint(hci_mon_tree, hf_adapter_id, tvb, offset, 0, adapter_id);
PROTO_ITEM_SET_GENERATED(sub_item);
sub_item = proto_tree_add_uint(hci_mon_tree, hf_opcode, tvb, offset, 0, opcode);
PROTO_ITEM_SET_GENERATED(sub_item);
col_append_fstr(pinfo->cinfo, COL_INFO, "Adapter Id: %u, Opcode: %s",
adapter_id, val_to_str_ext_const(opcode, &hci_mon_opcode_vals_ext, "Unknown"));
bluetooth_data->adapter_id = adapter_id;
k_interface_id = bluetooth_data->interface_id;
k_adapter_id = adapter_id;
k_frame_number = pinfo->num;
key[0].length = 1;
key[0].key = &k_interface_id;
key[1].length = 1;
key[1].key = &k_adapter_id;
if (!pinfo->fd->visited && opcode == 0x01) { /* Delete Index */
guint32 *disconnect_in_frame;
key[2].length = 1;
key[2].key = &k_frame_number;
key[3].length = 0;
key[3].key = NULL;
disconnect_in_frame = wmem_new(wmem_file_scope(), guint32);
if (disconnect_in_frame) {
*disconnect_in_frame = pinfo->num;
wmem_tree_insert32_array(adapter_to_disconnect_in_frame, key, disconnect_in_frame);
}
}
key[2].length = 0;
key[2].key = NULL;
subtree = (wmem_tree_t *) wmem_tree_lookup32_array(adapter_to_disconnect_in_frame, key);
adapter_disconnect_in_frame = (subtree) ? (guint32 *) wmem_tree_lookup32_le(subtree, k_frame_number) : NULL;
if (adapter_disconnect_in_frame) {
bluetooth_data->adapter_disconnect_in_frame = adapter_disconnect_in_frame;
} else {
bluetooth_data->adapter_disconnect_in_frame = &max_disconnect_in_frame;
}
pinfo->ptype = PT_BLUETOOTH;
next_tvb = tvb_new_subset_remaining(tvb, offset);
switch(opcode) {
case 0x00: /* New Index */
proto_tree_add_item(hci_mon_tree, hf_bus, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(hci_mon_tree, hf_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
offset = dissect_bd_addr(hf_bd_addr, pinfo, hci_mon_tree, tvb, offset, TRUE, bluetooth_data->interface_id, bluetooth_data->adapter_id, NULL);
proto_tree_add_item(hci_mon_tree, hf_name, tvb, offset, 8, ENC_NA | ENC_ASCII);
offset += 8;
break;
case 0x01: /* Delete Index */
/* No parameters */
break;
case 0x02: /* HCI Command Packet */
call_dissector_with_data(bthci_cmd_handle, next_tvb, pinfo, tree, bluetooth_data);
offset = tvb_reported_length(tvb);
break;
case 0x03: /* HCI Event Packet */
call_dissector_with_data(bthci_evt_handle, next_tvb, pinfo, tree, bluetooth_data);
offset = tvb_reported_length(tvb);
break;
case 0x04: /* ACL Tx Packet */
case 0x05: /* ACL Rx Packet */
call_dissector_with_data(bthci_acl_handle, next_tvb, pinfo, tree, bluetooth_data);
offset = tvb_reported_length(tvb);
break;
case 0x06: /* SCO Tx Packet */
case 0x07: /* SCO Rx Packet */
call_dissector_with_data(bthci_sco_handle, next_tvb, pinfo, tree, bluetooth_data);
offset = tvb_reported_length(tvb);
break;
}
if (tvb_reported_length_remaining(tvb, offset) > 0) {
proto_tree_add_expert(hci_mon_tree, pinfo, &ei_unknown_data, tvb, offset, tvb_reported_length_remaining(tvb, offset));
offset = tvb_reported_length(tvb);
}
/* NOTE: Oops... HCI_MON have special packet with length 0, but there is a pseudo-header with certain infos,
mark it as dissected */
if (opcode == 0x01)
return 1;
return offset;
}
void
proto_register_hci_mon(void)
{
module_t *module;
expert_module_t *expert_module;
static hf_register_info hf[] = {
{ &hf_adapter_id,
{ "Adapter ID", "hci_mon.adapter_id",
FT_UINT16, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_opcode,
{ "Opcode", "hci_mon.opcode",
FT_UINT16, BASE_HEX | BASE_EXT_STRING, &hci_mon_opcode_vals_ext, 0x00,
NULL, HFILL }
},
{ &hf_type,
{ "Type", "hci_mon.type",
FT_UINT8, BASE_HEX | BASE_EXT_STRING, &type_vals_ext, 0x00,
NULL, HFILL }
},
{ &hf_bus,
{ "Bus", "hci_mon.bus",
FT_UINT8, BASE_HEX | BASE_EXT_STRING, &bus_vals_ext, 0x00,
NULL, HFILL }
},
{ &hf_bd_addr,
{ "BD_ADDR", "hci_mon.bd_addr",
FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL}
},
{ &hf_name,
{ "Adapter Name", "hci_mon.adapter_name",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL}
}
};
static ei_register_info ei[] = {
{ &ei_unknown_data, { "hci_mon.unknown_data", PI_PROTOCOL, PI_WARN, "Unknown data", EXPFILL }},
};
static gint *ett[] = {
&ett_hci_mon,
};
proto_hci_mon = proto_register_protocol("Bluetooth Linux Monitor Transport", "HCI_MON", "hci_mon");
proto_register_field_array(proto_hci_mon, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
hci_mon_handle = register_dissector("hci_mon", dissect_hci_mon, proto_hci_mon);
expert_module = expert_register_protocol(proto_hci_mon);
expert_register_field_array(expert_module, ei, array_length(ei));
adapter_to_disconnect_in_frame = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
module = prefs_register_protocol_subtree("Bluetooth", proto_hci_mon, NULL);
prefs_register_static_text_preference(module, "bthci_mon.version",
"Bluetooth Linux Monitor Transport introduced in BlueZ 5.x",
"Version of protocol supported by this dissector.");
}
void
proto_reg_handoff_hci_mon(void)
{
bthci_cmd_handle = find_dissector_add_dependency("bthci_cmd", proto_hci_mon);
bthci_evt_handle = find_dissector_add_dependency("bthci_evt", proto_hci_mon);
bthci_acl_handle = find_dissector_add_dependency("bthci_acl", proto_hci_mon);
bthci_sco_handle = find_dissector_add_dependency("bthci_sco", proto_hci_mon);
dissector_add_uint("bluetooth.encap", WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR, hci_mon_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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