nexmon – Rev 1
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/* packet-hci_usb.c
* Routines for Bluetooth HCI USB dissection
*
* Copyright 2012, Michal Labedzki for Tieto Corporation
*
* 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>
#include <epan/prefs.h>
#include <epan/reassemble.h>
#include <wiretap/wtap.h>
#include "packet-bluetooth.h"
static int proto_hci_usb = -1;
static int hf_bthci_usb_data = -1;
static int hf_bthci_usb_packet_fragment = -1;
static int hf_bthci_usb_packet_complete = -1;
static int hf_bthci_usb_packet_unknown_fragment = -1;
static int hf_bthci_usb_setup_request = -1;
static int hf_bthci_usb_setup_value = -1;
static int hf_bthci_usb_setup_adapter_id = -1;
static int hf_bthci_usb_setup_length = -1;
static gint ett_hci_usb = -1;
static gint ett_hci_usb_msg_fragment = -1;
static gint ett_hci_usb_msg_fragments = -1;
static int hf_msg_fragments = -1;
static int hf_msg_fragment = -1;
static int hf_msg_fragment_overlap = -1;
static int hf_msg_fragment_overlap_conflicts = -1;
static int hf_msg_fragment_multiple_tails = -1;
static int hf_msg_fragment_too_long_fragment = -1;
static int hf_msg_fragment_error = -1;
static int hf_msg_fragment_count = -1;
static int hf_msg_reassembled_in = -1;
static int hf_msg_reassembled_length = -1;
static wmem_tree_t *fragment_info_table = NULL;
static reassembly_table hci_usb_reassembly_table;
static dissector_handle_t hci_usb_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;
typedef struct _fragment_info_t {
gint remaining_length;
gint fragment_id;
} fragment_info_t;
static const fragment_items hci_usb_msg_frag_items = {
/* Fragment subtrees */
&ett_hci_usb_msg_fragment,
&ett_hci_usb_msg_fragments,
/* Fragment fields */
&hf_msg_fragments,
&hf_msg_fragment,
&hf_msg_fragment_overlap,
&hf_msg_fragment_overlap_conflicts,
&hf_msg_fragment_multiple_tails,
&hf_msg_fragment_too_long_fragment,
&hf_msg_fragment_error,
&hf_msg_fragment_count,
/* Reassembled in field */
&hf_msg_reassembled_in,
/* Reassembled length field */
&hf_msg_reassembled_length,
/* Reassembled data field */
NULL,
/* Tag */
"Message fragments"
};
static const value_string request_vals[] = {
{ 0x00, "Primary Controller Function" },
{ 0x2B, "AMP Controller Function" },
{ 0xE0, "Primary Controller Function (Historical)" },
{ 0x00, NULL }
};
static value_string_ext(request_vals_ext) = VALUE_STRING_EXT_INIT(request_vals);
void proto_register_hci_usb(void);
void proto_reg_handoff_hci_usb(void);
static gint
dissect_hci_usb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_item *ttree = NULL;
proto_tree *titem = NULL;
proto_item *pitem = NULL;
gint offset = 0;
usb_conv_info_t *usb_conv_info;
tvbuff_t *next_tvb = NULL;
bluetooth_data_t *bluetooth_data;
gint p2p_dir_save;
guint32 session_id;
fragment_head *reassembled;
bluetooth_data = (bluetooth_data_t *) data;
/* Reject the packet if data is NULL */
if (data == NULL)
return 0;
DISSECTOR_ASSERT(bluetooth_data->previous_protocol_data_type == BT_PD_USB_CONV_INFO);
usb_conv_info = bluetooth_data->previous_protocol_data.usb_conv_info;
titem = proto_tree_add_item(tree, proto_hci_usb, tvb, offset, -1, ENC_NA);
ttree = proto_item_add_subtree(titem, ett_hci_usb);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI_USB");
p2p_dir_save = pinfo->p2p_dir;
pinfo->p2p_dir = (usb_conv_info->is_request) ? P2P_DIR_SENT : P2P_DIR_RECV;
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;
}
if (usb_conv_info->is_setup) {
proto_tree_add_item(ttree, hf_bthci_usb_setup_request, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(ttree, hf_bthci_usb_setup_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(ttree, hf_bthci_usb_setup_adapter_id, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(ttree, hf_bthci_usb_setup_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
}
session_id = usb_conv_info->bus_id << 16 | usb_conv_info->device_address << 8 | ((pinfo->p2p_dir == P2P_DIR_RECV) ? 1 : 0 ) << 7 | usb_conv_info->endpoint;
bluetooth_data->adapter_id = usb_conv_info->bus_id << 8 | usb_conv_info->device_address;
/* TODO: adapter disconnect on some USB action, for now do not support adapter disconnection */
bluetooth_data->adapter_disconnect_in_frame = &max_disconnect_in_frame;
next_tvb = tvb_new_subset_remaining(tvb, offset);
if (!pinfo->fd->flags.visited && usb_conv_info->endpoint <= 0x02 &&
tvb_captured_length(tvb) == tvb_reported_length(tvb)) {
fragment_info_t *fragment_info;
fragment_info = (fragment_info_t *) wmem_tree_lookup32(fragment_info_table, session_id);
if (fragment_info == NULL) {
fragment_info = (fragment_info_t *) wmem_new(wmem_file_scope(), fragment_info_t);
fragment_info->fragment_id = 0;
fragment_info->remaining_length = 0;
wmem_tree_insert32(fragment_info_table, session_id, fragment_info);
}
if (fragment_info->fragment_id == 0) {
switch(usb_conv_info->endpoint)
{
case 0:
fragment_info->remaining_length = tvb_get_guint8(tvb, offset + 2) + 3;
break;
case 1:
fragment_info->remaining_length = tvb_get_guint8(tvb, offset + 1) + 2;
break;
case 2:
fragment_info->remaining_length = tvb_get_letohs(tvb, offset + 2) + 4;
break;
}
}
fragment_info->remaining_length -= tvb_reported_length_remaining(tvb, offset);
fragment_add_seq_check(&hci_usb_reassembly_table,
tvb, offset, pinfo, session_id, NULL,
fragment_info->fragment_id, tvb_reported_length_remaining(tvb, offset), (fragment_info->remaining_length == 0) ? FALSE : TRUE);
if (fragment_info->remaining_length > 0)
fragment_info->fragment_id += 1;
else
fragment_info->fragment_id = 0;
}
reassembled = fragment_get_reassembled_id(&hci_usb_reassembly_table, pinfo, session_id);
if (reassembled && pinfo->num < reassembled->reassembled_in) {
pitem = proto_tree_add_item(ttree, hf_bthci_usb_packet_fragment, tvb, offset, -1, ENC_NA);
PROTO_ITEM_SET_GENERATED(pitem);
col_append_str(pinfo->cinfo, COL_INFO, " Fragment");
} else if (reassembled && pinfo->num == reassembled->reassembled_in) {
pitem = proto_tree_add_item(ttree, hf_bthci_usb_packet_complete, tvb, offset, -1, ENC_NA);
PROTO_ITEM_SET_GENERATED(pitem);
if (reassembled->len > (guint) tvb_reported_length_remaining(tvb, offset)) {
next_tvb = process_reassembled_data(tvb, 0, pinfo,
"Reassembled HCI_USB",
reassembled, &hci_usb_msg_frag_items,
NULL, ttree);
}
switch(usb_conv_info->endpoint)
{
case 0:
call_dissector_with_data(bthci_cmd_handle, next_tvb, pinfo, tree, bluetooth_data);
break;
case 1:
call_dissector_with_data(bthci_evt_handle, next_tvb, pinfo, tree, bluetooth_data);
break;
case 2:
call_dissector_with_data(bthci_acl_handle, next_tvb, pinfo, tree, bluetooth_data);
break;
}
} else {
pitem = proto_tree_add_item(ttree, hf_bthci_usb_packet_unknown_fragment, tvb, offset, -1, ENC_NA);
PROTO_ITEM_SET_GENERATED(pitem);
}
if (usb_conv_info->endpoint == 0x03) {
call_dissector_with_data(bthci_sco_handle, next_tvb, pinfo, tree, bluetooth_data);
} else if (usb_conv_info->endpoint > 0x03) {
proto_tree_add_item(ttree, hf_bthci_usb_data, tvb, offset, -1, ENC_NA);
}
offset += tvb_reported_length_remaining(tvb, offset);
pinfo->p2p_dir = p2p_dir_save;
return offset;
}
void
proto_register_hci_usb(void)
{
module_t *module;
static hf_register_info hf[] = {
{ &hf_msg_fragments,
{ "Message fragments", "hci_usb.msg.fragments",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment,
{ "Message fragment", "hci_usb.msg.fragment",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_overlap,
{ "Message fragment overlap", "hci_usb.msg.fragment.overlap",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_overlap_conflicts,
{ "Message fragment overlapping with conflicting data", "hci_usb.msg.fragment.overlap.conflicts",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_multiple_tails,
{ "Message has multiple tail fragments", "hci_usb.msg.fragment.multiple_tails",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_too_long_fragment,
{ "Message fragment too long", "hci_usb.msg.fragment.too_long_fragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_error,
{ "Message defragmentation error", "hci_usb.msg.fragment.error",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_fragment_count,
{ "Message fragment count", "hci_usb.msg.fragment.count",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_reassembled_in,
{ "Reassembled in", "hci_usb.msg.reassembled.in",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_msg_reassembled_length,
{ "Reassembled MP2T length", "hci_usb.msg.reassembled.length",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_bthci_usb_packet_fragment,
{ "Packet Fragment", "hci_usb.packet.fragment",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_bthci_usb_packet_complete,
{ "Packet Complete", "hci_usb.packet.complete",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_bthci_usb_packet_unknown_fragment,
{ "Unknown Packet Fragment", "hci_usb.packet.unknown_fragment",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_bthci_usb_setup_request,
{ "bRequest", "hci_usb.setup.bRequest",
FT_UINT8, BASE_DEC | BASE_EXT_STRING, &request_vals_ext, 0x0,
NULL, HFILL }},
{ &hf_bthci_usb_setup_value,
{ "wValue", "hci_usb.setup.wValue",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_bthci_usb_setup_adapter_id,
{ "Adapter ID", "hci_usb.setup.adapter_id",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bthci_usb_setup_length,
{ "wLength", "hci_usb.setup.wLength",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bthci_usb_data,
{ "Unknown Data", "hci_usb.data",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
}
};
static gint *ett[] = {
&ett_hci_usb,
&ett_hci_usb_msg_fragment,
&ett_hci_usb_msg_fragments,
};
reassembly_table_init(&hci_usb_reassembly_table,
&addresses_reassembly_table_functions);
fragment_info_table = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
proto_hci_usb = proto_register_protocol("Bluetooth HCI USB Transport", "HCI_USB", "hci_usb");
proto_register_field_array(proto_hci_usb, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
hci_usb_handle = register_dissector("hci_usb", dissect_hci_usb, proto_hci_usb);
module = prefs_register_protocol(proto_hci_usb, NULL);
prefs_register_static_text_preference(module, "bthci_usb.version",
"Bluetooth HCI USB Transport from Core 4.0",
"Version of protocol supported by this dissector.");
}
void
proto_reg_handoff_hci_usb(void)
{
bthci_cmd_handle = find_dissector_add_dependency("bthci_cmd", proto_hci_usb);
bthci_evt_handle = find_dissector_add_dependency("bthci_evt", proto_hci_usb);
bthci_acl_handle = find_dissector_add_dependency("bthci_acl", proto_hci_usb);
bthci_sco_handle = find_dissector_add_dependency("bthci_sco", proto_hci_usb);
}
/*
* 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:
*/