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|
/* packet-btamp.c
* Routines for the Bluetooth AMP dissection
*
* Copyright 2009, Kovarththanan Rajaratnam <kovarththanan.rajaratnam@gmail.com>
*
* 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 "packet-btl2cap.h"
/* Initialize the protocol and registered fields */
static int proto_btamp;
static int hf_btamp_command;
static int hf_btamp_cmd_code;
static int hf_btamp_cmd_ident;
static int hf_btamp_cmd_length;
static int hf_btamp_cmd_data;
static int hf_btamp_rej_reason;
static int hf_btamp_mtu;
static int hf_btamp_extfeatures;
static int hf_btamp_lcontroller_id;
static int hf_btamp_rcontroller_id;
static int hf_btamp_controller_list;
static int hf_btamp_controllers;
static int hf_btamp_controller_id;
static int hf_btamp_controller_type;
static int hf_btamp_controller_status;
static int hf_btamp_status;
/* static int hf_btamp_create_status; */
/* static int hf_btamp_disc_status; */
static int hf_btamp_total_bw;
static int hf_btamp_max_guaran_bw;
static int hf_btamp_min_latency;
static int hf_btamp_pal_caps_guaranteed;
static int hf_btamp_pal_caps_mask;
static int hf_btamp_amp_assoc_size;
static int hf_btamp_amp_assoc;
/* Initialize the subtree pointers */
static int ett_btamp;
static int ett_btamp_cmd;
static int ett_btamp_caps;
static int ett_btamp_controller_entry;
static int ett_btamp_controller_list;
static dissector_handle_t btamp_handle;
static const value_string command_code_vals[] = {
{ 0x01, "AMP Command Reject" },
{ 0x02, "AMP Discover Request" },
{ 0x03, "AMP Discover Response" },
{ 0x04, "AMP Change Notify" },
{ 0x05, "AMP Change Response" },
{ 0x06, "AMP Get Info Request" },
{ 0x07, "AMP Get Info Response" },
{ 0x08, "AMP Get AMP Assoc Request" },
{ 0x09, "AMP Get AMP Assoc Response" },
{ 0x0A, "AMP Create Physical Link Request" },
{ 0x0B, "AMP Create Physical Link Response" },
{ 0x0C, "AMP Disconnect Physical Link Request" },
{ 0x0D, "AMP Disconnect Physical Link Response" },
{ 0, NULL }
};
static const value_string reason_vals[] = {
{ 0x0000, "Command not understood" },
{ 0, NULL }
};
static const value_string controller_type_vals[] = {
{ 0x0000, "Bluetooth BR/EDR" },
{ 0x0001, "802.11" },
{ 0x0002, "ECMA-368" },
{ 0, NULL }
};
static const value_string controller_status_vals[] = {
{ 0x0000, "Controller available but currently physically powered down" },
{ 0x0001, "Controller used exclusively by Bluetooth BR/EDR" },
{ 0x0002, "Controller has no capacity available for Bluetooth operation" },
{ 0x0003, "Controller has low capacity available for Bluetooth operation" },
{ 0x0004, "Controller has medium capacity available for Bluetooth operation" },
{ 0x0005, "Controller has high capacity available for Bluetooth operation" },
{ 0x0006, "Controller has full capacity available for Bluetooth operation" },
{ 0, NULL }
};
static const value_string status_vals[] = {
{ 0x0000, "Success" },
{ 0x0001, "Invalid Controller ID" },
{ 0, NULL }
};
#if 0
static const value_string create_status_vals[] = {
{ 0x0000, "Success" },
{ 0x0001, "Invalid Controller ID" },
{ 0x0002, "Failed - Unable to start link creation" },
{ 0x0003, "Failed - Collision Occurred" },
{ 0x0004, "Failed - AMP Disconnected Physical Link Request packet received" },
{ 0x0005, "Failed - Physical Link Already Exists" },
{ 0, NULL }
};
static const value_string disc_status_vals[] = {
{ 0x0000, "Success" },
{ 0x0001, "Invalid Controller ID" },
{ 0x0002, "Failed - No Physical Link exists and no Physical Link creation is in progress" },
{ 0, NULL }
};
#endif
void proto_register_btamp(void);
void proto_reg_handoff_btamp(void);
static int
dissect_comrej(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
uint16_t reason;
reason = tvb_get_letohs(tvb, offset);
proto_tree_add_item(tree, hf_btamp_rej_reason, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
switch (reason) {
case 0x0000: /* Command not understood */
break;
default:
break;
}
return offset;
}
static int
dissect_discoverrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_mtu, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_btamp_extfeatures, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
return offset;
}
static int
dissect_controller_entry(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, uint16_t idx)
{
proto_item *ti_controller_entry;
proto_tree *btamp_controller_entry_tree;
ti_controller_entry = proto_tree_add_none_format(tree,
hf_btamp_controllers, tvb,
offset, 3,
"Entry: %u", idx);
btamp_controller_entry_tree = proto_item_add_subtree(ti_controller_entry, ett_btamp_controller_entry);
proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(btamp_controller_entry_tree, hf_btamp_controller_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_discoverresponse(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
uint16_t length;
uint16_t idx = 1;
proto_item *ti_controller_list;
proto_tree *btamp_controller_list_tree;
proto_tree_add_item(tree, hf_btamp_mtu, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_btamp_extfeatures, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
length = tvb_reported_length_remaining(tvb, offset);
ti_controller_list = proto_tree_add_none_format(tree,
hf_btamp_controller_list, tvb,
offset, length,
"Controller list");
btamp_controller_list_tree = proto_item_add_subtree(ti_controller_list, ett_btamp_controller_list);
while (tvb_reported_length_remaining(tvb, offset) >= 3) {
offset = dissect_controller_entry(tvb, offset, pinfo, btamp_controller_list_tree, idx);
idx += 1;
}
return offset;
}
static int
dissect_changenotify(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
uint16_t length;
uint16_t idx = 1;
proto_item *ti_controller_list;
proto_tree *btamp_controller_list_tree;
length = tvb_reported_length_remaining(tvb, offset);
ti_controller_list = proto_tree_add_none_format(tree,
hf_btamp_controller_list, tvb,
offset, length,
"Controller list");
btamp_controller_list_tree = proto_item_add_subtree(ti_controller_list, ett_btamp_controller_list);
while (tvb_reported_length_remaining(tvb, offset) >= 3) {
offset = dissect_controller_entry(tvb, offset, pinfo, btamp_controller_list_tree, idx);
idx += 1;
}
return offset;
}
static int
dissect_changeresponse(tvbuff_t *tvb _U_, int offset, packet_info *pinfo _U_, proto_tree *tree _U_)
{
return offset;
}
static int
dissect_getinforequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_getinforesponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_item *ti_controller;
proto_tree *btamp_controller_tree;
proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_total_bw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(tree, hf_btamp_max_guaran_bw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(tree, hf_btamp_min_latency, tvb, offset, 4, ENC_LITTLE_ENDIAN);
offset += 4;
ti_controller = proto_tree_add_none_format(tree,
hf_btamp_pal_caps_mask, tvb,
offset, 2,
"PAL Capabilities");
btamp_controller_tree = proto_item_add_subtree(ti_controller, ett_btamp_caps);
proto_tree_add_item(btamp_controller_tree, hf_btamp_pal_caps_guaranteed, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_btamp_amp_assoc_size, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
return offset;
}
static int
dissect_getampassocrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_ampassoc(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_amp_assoc, tvb, offset, tvb_reported_length_remaining(tvb, offset), ENC_NA);
return tvb_reported_length(tvb);
}
static int
dissect_getampassocresponse(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_controller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
offset = dissect_ampassoc(tvb, offset, pinfo, tree);
return offset;
}
static int
dissect_createphysicalrequest(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
offset = dissect_ampassoc(tvb, offset, pinfo, tree);
return offset;
}
static int
dissect_createphysicalresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_discphysicalchanrequest(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_discphysicalchanresponse(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_btamp_lcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_rcontroller_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_btamp_controller_status, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
return offset;
}
static int
dissect_btamp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
int offset = 0;
proto_item *ti;
proto_tree *btamp_tree;
uint16_t length;
proto_item *ti_command;
proto_tree *btamp_cmd_tree;
uint8_t cmd_code;
uint16_t cmd_length;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AMP");
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;
}
ti = proto_tree_add_item(tree, proto_btamp, tvb, offset, -1, ENC_NA);
btamp_tree = proto_item_add_subtree(ti, ett_btamp);
length = tvb_reported_length_remaining(tvb, offset);
ti_command = proto_tree_add_none_format(btamp_tree,
hf_btamp_command, tvb,
offset, length,
"Command: ");
btamp_cmd_tree = proto_item_add_subtree(ti_command, ett_btamp_cmd);
cmd_code = tvb_get_uint8(tvb, offset);
proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_code, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_ident, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
cmd_length = tvb_get_letohs(tvb, offset);
proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
proto_item_set_len(ti_command, cmd_length+4);
offset += 2;
switch(cmd_code) {
case 0x01: /* Command Reject */
offset = dissect_comrej(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x02: /* Discover Request */
offset = dissect_discoverrequest(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x03: /* Discover Response */
offset = dissect_discoverresponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x04: /* AMP Change Notify */
offset = dissect_changenotify(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x05: /* AMP Change Response */
offset = dissect_changeresponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x06: /* AMP Get Info Request */
offset = dissect_getinforequest(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x07: /* AMP Get Info Response */
offset = dissect_getinforesponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x08: /* Get AMP Assoc Request */
offset = dissect_getampassocrequest(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x09: /* Get AMP Assoc Response */
offset = dissect_getampassocresponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x0A: /* Create Physical Link Request */
offset = dissect_createphysicalrequest(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x0B: /* Create Physical Link Response */
offset = dissect_createphysicalresponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x0c: /* Disconnect Physical Link Request */
offset = dissect_discphysicalchanrequest(tvb, offset, pinfo, btamp_cmd_tree);
break;
case 0x0d: /* Disconnect Physical Link Response */
offset = dissect_discphysicalchanresponse(tvb, offset, pinfo, btamp_cmd_tree);
break;
default:
proto_tree_add_item(btamp_cmd_tree, hf_btamp_cmd_data, tvb, offset, -1, ENC_NA);
offset = tvb_reported_length(tvb);
break;
}
proto_item_append_text(ti_command, "%s", val_to_str(cmd_code, command_code_vals, "Unknown PDU (%u)"));
col_append_str(pinfo->cinfo, COL_INFO, val_to_str(cmd_code, command_code_vals, "Unknown PDU (%u)"));
return offset;
}
/* Register the protocol with Wireshark */
void
proto_register_btamp(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_btamp_command,
{ "Command", "btamp.command",
FT_NONE, BASE_NONE, NULL, 0x0,
"L2CAP Command", HFILL }
},
{ &hf_btamp_cmd_code,
{ "Command Code", "btamp.cmd_code",
FT_UINT8, BASE_HEX, VALS(command_code_vals), 0x0,
"L2CAP Command Code", HFILL }
},
{ &hf_btamp_cmd_ident,
{ "Command Identifier", "btamp.cmd_ident",
FT_UINT8, BASE_HEX, NULL, 0x0,
"L2CAP Command Identifier", HFILL }
},
{ &hf_btamp_cmd_length,
{ "Command Length", "btamp.cmd_length",
FT_UINT16, BASE_DEC, NULL, 0x0,
"L2CAP Command Length", HFILL }
},
{ &hf_btamp_cmd_data,
{ "Command Data", "btamp.cmd_data",
FT_NONE, BASE_NONE, NULL, 0x0,
"L2CAP Command Data", HFILL }
},
{ &hf_btamp_rej_reason,
{ "Reason", "btamp.rej_reason",
FT_UINT16, BASE_HEX, VALS(reason_vals), 0x0,
NULL, HFILL }
},
{ &hf_btamp_mtu,
{ "MPS/MTU", "btamp.mps",
FT_UINT16, BASE_HEX, NULL, 0x0,
"MPS/MTU Size", HFILL }
},
{ &hf_btamp_extfeatures,
{ "Extended Features", "btamp.extfeatures",
FT_UINT16, BASE_HEX, NULL, 0x0,
"Extended Features Mask", HFILL }
},
{ &hf_btamp_controllers,
{ "Controller entry", "btamp.ctrl_entry",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_controller_list,
{ "Controller list", "btamp.ctrl_list",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_lcontroller_id,
{ "Local Controller ID", "btamp.lctrl_id",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_rcontroller_id,
{ "Remote Controller ID", "btamp.rctrl_id",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_controller_id,
{ "Controller ID", "btamp.ctrl_id",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_controller_type,
{ "Controller Type", "btamp.ctrl_type",
FT_UINT8, BASE_DEC, VALS(controller_type_vals), 0x0,
NULL, HFILL }
},
{ &hf_btamp_controller_status,
{ "Controller Status", "btamp.ctrl_status",
FT_UINT8, BASE_DEC, VALS(controller_status_vals), 0x0,
NULL, HFILL }
},
{ &hf_btamp_status,
{ "Status", "btamp.status",
FT_UINT8, BASE_DEC, VALS(status_vals), 0x0,
NULL, HFILL }
},
#if 0
{ &hf_btamp_create_status,
{ "Status", "btamp.create_status",
FT_UINT8, BASE_DEC, VALS(create_status_vals), 0x0,
NULL, HFILL }
},
{ &hf_btamp_disc_status,
{ "Status", "btamp.disc_status",
FT_UINT8, BASE_DEC, VALS(disc_status_vals), 0x0,
NULL, HFILL }
},
#endif
{ &hf_btamp_pal_caps_mask,
{ "PAL Capabilities Mask", "btamp.pal_caps_mask",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_pal_caps_guaranteed,
{ "Guaranteed Service type", "btamp.guaranteed_type",
FT_BOOLEAN, 16, NULL, 0x0001,
NULL, HFILL }
},
{ &hf_btamp_total_bw,
{ "Total Bandwidth", "btamp.total_bw",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_max_guaran_bw,
{ "Max Guaranteed Bandwidth", "btamp.max_guaran_bw",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_min_latency,
{ "Minimum latency", "btamp.min_latency",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_amp_assoc_size,
{ "Assoc Size", "btamp.assoc_size",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btamp_amp_assoc,
{ "Assoc", "btamp.assoc",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
/* Setup protocol subtree array */
static int *ett[] = {
&ett_btamp,
&ett_btamp_cmd,
&ett_btamp_caps,
&ett_btamp_controller_entry,
&ett_btamp_controller_list,
};
/* Register the protocol name and description */
proto_btamp = proto_register_protocol("Bluetooth AMP Packet", "BT AMP", "btamp");
btamp_handle = register_dissector("btamp", dissect_btamp, proto_btamp);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_btamp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_btamp(void)
{
dissector_add_uint("btl2cap.cid", BTL2CAP_FIXED_CID_AMP_MAN, btamp_handle);
}
/*
* Editor modelines - https://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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