/* packet-usb-hub.c
 * Routines for USB HUB dissection
 * Copyright 2009, Marton Nemeth <nm127@freemail.hu>
 *
 * USB HUB Specification can be found in the Universal Serial Bus
 * Specification 2.0, Chapter 11 Hub Specification.
 * http://www.usb.org/developers/docs/usb_20_052709.zip
 *
 * 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-usb.h"

void proto_register_usb_hub(void);
void proto_reg_handoff_usb_hub(void);

/* protocols and header fields */
static int proto_usb_hub = -1;

/* USB 2.0, Chapter 11.24.2 Class-Specific Requests */
static int hf_usb_hub_request = -1;
static int hf_usb_hub_value = -1;
static int hf_usb_hub_index = -1;
static int hf_usb_hub_length = -1;

static int hf_usb_hub_hub_feature_selector = -1;
static int hf_usb_hub_port_feature_selector = -1;
static int hf_usb_hub_dev_addr = -1;
static int hf_usb_hub_ep_num = -1;
static int hf_usb_hub_descriptor_type = -1;
static int hf_usb_hub_descriptor_index = -1;
static int hf_usb_hub_zero = -1;
static int hf_usb_hub_tt_flags = -1;
static int hf_usb_hub_tt_port = -1;
static int hf_usb_hub_tt_state_length = -1;
static int hf_usb_hub_port = -1;
static int hf_usb_hub_port_selector = -1;
static int hf_usb_hub_port_status = -1;
static int hf_usb_hub_port_change = -1;
static int hf_usb_hub_port_status_connection = -1;
static int hf_usb_hub_port_status_enable = -1;
static int hf_usb_hub_port_status_suspend = -1;
static int hf_usb_hub_port_status_overcurrent = -1;
static int hf_usb_hub_port_status_reset = -1;
static int hf_usb_hub_port_status_power = -1;
static int hf_usb_hub_port_status_low_speed = -1;
static int hf_usb_hub_port_status_high_speed = -1;
static int hf_usb_hub_port_status_test = -1;
static int hf_usb_hub_port_status_indicator = -1;
static int hf_usb_hub_port_change_connection = -1;
static int hf_usb_hub_port_change_enable = -1;
static int hf_usb_hub_port_change_suspend = -1;
static int hf_usb_hub_port_change_overcurrent = -1;
static int hf_usb_hub_port_change_reset = -1;
static int hf_usb_hub_descriptor_length = -1;

static gint ett_usb_hub_wValue = -1;
static gint ett_usb_hub_wIndex = -1;
static gint ett_usb_hub_wLength = -1;
static gint ett_usb_hub_port_status = -1;
static gint ett_usb_hub_port_change = -1;

/* Table 11-16. Hub Class Request Codes */
#define USB_HUB_REQUEST_GET_STATUS            0
#define USB_HUB_REQUEST_CLEAR_FEATURE         1
#define USB_HUB_REQUEST_SET_FEATURE           3
#define USB_HUB_REQUEST_GET_DESCRIPTOR        6
#define USB_HUB_REQUEST_SET_DESCRIPTOR        7
#define USB_HUB_REQUEST_CLEAR_TT_BUFFER       8
#define USB_HUB_REQUEST_RESET_TT              9
#define USB_HUB_REQUEST_GET_TT_STATE         10
#define USB_HUB_REQUEST_STOP_TT              11

static const value_string setup_request_names_vals[] = {
	{ USB_HUB_REQUEST_GET_STATUS,	   "GET_STATUS" },
	{ USB_HUB_REQUEST_CLEAR_FEATURE,   "CLEAR_FEATURE" },
	{ USB_HUB_REQUEST_SET_FEATURE,	   "SET_FEATURE" },
	{ USB_HUB_REQUEST_GET_DESCRIPTOR,  "GET_DESCRIPTOR" },
	{ USB_HUB_REQUEST_SET_DESCRIPTOR,  "SET_DESCRIPTOR" },
	{ USB_HUB_REQUEST_CLEAR_TT_BUFFER, "CLEAR_TT_BUFFER" },
	{ USB_HUB_REQUEST_GET_TT_STATE,	   "GET_TT_STATE" },
	{ USB_HUB_REQUEST_STOP_TT,	   "STOP_TT" },
	{ 0, NULL }
};


/* Table 11-17 Hub Class Feature Selectors */
#define USB_HUB_FEATURE_C_HUB_LOCAL_POWER      0
#define USB_HUB_FEATURE_C_HUB_OVER_CURRENT     1

#define USB_HUB_FEATURE_PORT_CONNECTION        0
#define USB_HUB_FEATURE_PORT_ENABLE            1
#define USB_HUB_FEATURE_PORT_SUSPEND           2
#define USB_HUB_FEATURE_PORT_OVER_CURRENT      3
#define USB_HUB_FEATURE_PORT_RESET             4
#define USB_HUB_FEATURE_PORT_POWER             8
#define USB_HUB_FEATURE_PORT_LOW_SPEED         9
#define USB_HUB_FEATURE_C_PORT_CONNECTION     16
#define USB_HUB_FEATURE_C_PORT_ENABLE         17
#define USB_HUB_FEATURE_C_PORT_SUSPEND        18
#define USB_HUB_FEATURE_C_PORT_OVER_CURRENT   19
#define USB_HUB_FEATURE_C_PORT_RESET          20
#define USB_HUB_FEATURE_PORT_TEST             21
#define USB_HUB_FEATURE_PORT_INDICATOR        22
/* Table 10-9 Hub Class Feature Selectors (USB3) */
#define USB_HUB_FEATURE_PORT_U1_TIMEOUT       23
#define USB_HUB_FEATURE_PORT_U2_TIMEOUT       24
#define USB_HUB_FEATURE_C_PORT_LINK_STATE     25
#define USB_HUB_FEATURE_C_PORT_CONFIG_ERROR   26
#define USB_HUB_FEATURE_PORT_REMOTE_WAKE_MASK 27
#define USB_HUB_FEATURE_BH_PORT_RESET         28
#define USB_HUB_FEATURE_C_BH_PORT_RESET       29
#define USB_HUB_FEATURE_FORCE_LINKPM_ACCEPT   30

static const value_string hub_class_feature_selectors_recipient_hub_vals[] = {
	{ USB_HUB_FEATURE_C_HUB_LOCAL_POWER,  "C_HUB_LOCAL_POWER" },
	{ USB_HUB_FEATURE_C_HUB_OVER_CURRENT, "C_HUB_OVER_CURRENT" },
	{ 0, NULL }
};

static const value_string hub_class_feature_selectors_recipient_port_vals[] = {
	{ USB_HUB_FEATURE_PORT_CONNECTION,      "PORT_CONNECTION" },
	{ USB_HUB_FEATURE_PORT_ENABLE,          "PORT_ENABLE" },
	{ USB_HUB_FEATURE_PORT_SUSPEND,         "PORT_SUSPEND" },
	{ USB_HUB_FEATURE_PORT_OVER_CURRENT,    "PORT_OVER_CURRENT" },
	{ USB_HUB_FEATURE_PORT_RESET,           "PORT_RESET" },
	{ USB_HUB_FEATURE_PORT_POWER,           "PORT_POWER" },
	{ USB_HUB_FEATURE_PORT_LOW_SPEED,       "PORT_LOW_SPEED" },
	{ USB_HUB_FEATURE_C_PORT_CONNECTION,    "C_PORT_CONNECTION" },
	{ USB_HUB_FEATURE_C_PORT_ENABLE,        "C_PORT_ENABLE" },
	{ USB_HUB_FEATURE_C_PORT_SUSPEND,       "C_PORT_SUSPEND" },
	{ USB_HUB_FEATURE_C_PORT_OVER_CURRENT,  "C_PORT_OVER_CURRENT" },
	{ USB_HUB_FEATURE_C_PORT_RESET,         "C_PORT_RESET" },
	{ USB_HUB_FEATURE_PORT_TEST,            "PORT_TEST" },
	{ USB_HUB_FEATURE_PORT_INDICATOR,       "PORT_INDICATOR" },
	{ USB_HUB_FEATURE_PORT_U1_TIMEOUT,      "PORT_U1_TIMEOUT" },
	{ USB_HUB_FEATURE_PORT_U2_TIMEOUT,      "PORT_U2_TIMEOUT" },
	{ USB_HUB_FEATURE_C_PORT_LINK_STATE,    "C_PORT_LINK_STATE" },
	{ USB_HUB_FEATURE_C_PORT_CONFIG_ERROR,  "C_PORT_CONFIG_ERROR" },
	{ USB_HUB_FEATURE_PORT_REMOTE_WAKE_MASK,"PORT_REMOTE_WAKE_MASK" },
	{ USB_HUB_FEATURE_BH_PORT_RESET,        "BH_PORT_RESET" },
	{ USB_HUB_FEATURE_C_BH_PORT_RESET,      "C_BH_PORT_RESET" },
	{ USB_HUB_FEATURE_FORCE_LINKPM_ACCEPT,  "FORCE_LINKPM_ACCEPT" },
	{ 0, NULL }
};

static const true_false_string hub_port_status_indicator_meaning = {
	"Software-controlled color",
	"Default colors"
};

/* Dissector for ClearHubFeature, Chapter 11.24.2.1 Clear Hub Feature */
static void
dissect_usb_hub_clear_hub_feature(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;
	const gchar* feature_name;

	feature_name = val_to_str(usb_trans_info->setup.wValue,
								hub_class_feature_selectors_recipient_hub_vals,
								"UNKNOWN (0x%x)");
	col_append_fstr(pinfo->cinfo, COL_INFO, " [Hub: %s]", feature_name);

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_hub_feature_selector, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for ClearPortFeature, Chapter 11.24.2.2 Clear Port Feature */
static void
dissect_usb_hub_clear_port_feature(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;
	const gchar* feature_name;

	feature_name = val_to_str(usb_trans_info->setup.wValue,
								hub_class_feature_selectors_recipient_port_vals,
								"UNKNOWN (0x%x)");
	col_append_fstr(pinfo->cinfo, COL_INFO, " [Port %u: %s]", usb_trans_info->setup.wIndex, feature_name);

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_port_feature_selector, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_port, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;
		proto_tree_add_item(subtree, hf_usb_hub_port_selector, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for ClearTTBuffer, Chapter 11.24.2.3 Clear TT Buffer */
static void
dissect_usb_hub_clear_tt_buffer(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_ep_num, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;
		proto_tree_add_item(subtree, hf_usb_hub_dev_addr, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;

		proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_tt_port, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for GetHubDescriptor, Chapter 11.24.2.5 Get Hub Descriptor */
static void
dissect_usb_hub_get_hub_descriptor(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_index, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for GetHubStatus, Chapter 11.24.2.6 Get Hub Status */
static void
dissect_usb_hub_get_hub_status(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	col_append_str(pinfo->cinfo, COL_INFO, "    [Hub]");

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/* length shall always contain 4 */
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for GetPortStatus, Chapter 11.24.2.7 Get Port Status */
static void
dissect_usb_hub_get_port_status(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	col_append_fstr(pinfo->cinfo, COL_INFO, "    [Port %u]", usb_trans_info->setup.wIndex);

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_port, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/* length shall always contain 4 */
		/*offset += 2;*/
	} else {
		static int * const status_fields[] = {
			&hf_usb_hub_port_status_connection,
			&hf_usb_hub_port_status_enable,
			&hf_usb_hub_port_status_suspend,
			&hf_usb_hub_port_status_overcurrent,
			&hf_usb_hub_port_status_reset,
			&hf_usb_hub_port_status_power,
			&hf_usb_hub_port_status_low_speed,
			&hf_usb_hub_port_status_high_speed,
			&hf_usb_hub_port_status_test,
			&hf_usb_hub_port_status_indicator,
			NULL
		};

		static int * const change_fields[] = {
			&hf_usb_hub_port_change_connection,
			&hf_usb_hub_port_change_enable,
			&hf_usb_hub_port_change_suspend,
			&hf_usb_hub_port_change_overcurrent,
			&hf_usb_hub_port_change_reset,
			NULL
		};

		proto_tree_add_bitmask(tree, tvb, offset, hf_usb_hub_port_status,
		                       ett_usb_hub_port_status, status_fields, ENC_LITTLE_ENDIAN);
		offset += 2;
		proto_tree_add_bitmask(tree, tvb, offset, hf_usb_hub_port_change,
		                       ett_usb_hub_port_change, change_fields, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	}
}

/* Dissector for GetTTState, Chapter 11.24.2.8 Get_TT_State */
static void
dissect_usb_hub_get_tt_state(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_tt_flags, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_tt_port, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_tt_state_length, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for ResetTT, Chapter 11.24.2.9 Reset_TT */
static void
dissect_usb_hub_reset_tt(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_tt_port, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for SetHubDescriptor, Chapter 11.24.2.10 Set Hub Descriptor */
static void
dissect_usb_hub_set_hub_descriptor(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_index, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_descriptor_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for StopTT, Chapter 11.24.2.11 Stop TT */
static void
dissect_usb_hub_stop_tt(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info _U_, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_tt_port, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for SetHubFeature, Chapter 11.24.2.12 Set Hub Feature */
static void
dissect_usb_hub_set_hub_feature(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;
	const gchar* feature_name;
	feature_name = val_to_str(usb_trans_info->setup.wValue,
								hub_class_feature_selectors_recipient_hub_vals,
								"UNKNOWN (0x%x)");
	col_append_fstr(pinfo->cinfo, COL_INFO, "   [Hub: %s]", feature_name);

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_hub_feature_selector, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wIndex);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}

/* Dissector for SetPortFeature, Chapter 11.24.2.13 Set Port Feature */
static void
dissect_usb_hub_set_port_feature(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info, usb_conv_info_t *usb_conv_info _U_)
{
	proto_item *item = NULL;
	proto_tree *subtree = NULL;
	const gchar* feature_name;

	feature_name = val_to_str(usb_trans_info->setup.wValue,
								hub_class_feature_selectors_recipient_port_vals,
								"UNKNOWN (0x%x)");
	col_append_fstr(pinfo->cinfo, COL_INFO, "   [Port %u: %s]", usb_trans_info->setup.wIndex,
					feature_name);

	if (is_request) {
		item = proto_tree_add_item(tree, hf_usb_hub_value, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_port_feature_selector, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		offset += 2;

		item = proto_tree_add_item(tree, hf_usb_hub_index, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wValue);
		proto_tree_add_item(subtree, hf_usb_hub_port, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;
		proto_tree_add_item(subtree, hf_usb_hub_port_selector, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset++;

		item = proto_tree_add_item(tree, hf_usb_hub_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		subtree = proto_item_add_subtree(item, ett_usb_hub_wLength);
		proto_tree_add_item(subtree, hf_usb_hub_zero, tvb, offset, 2, ENC_LITTLE_ENDIAN);
		/*offset += 2;*/
	} else {
	}
}


typedef void (*usb_setup_dissector)(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean is_request, usb_trans_info_t *usb_trans_info, usb_conv_info_t *usb_conv_info);

typedef struct _usb_setup_dissector_table_t {
	guint8 request_type;
	guint8 request;
	usb_setup_dissector dissector;
} usb_setup_dissector_table_t;


/* USB 2.0, Table 11-15 Hub Class Requests */
static const usb_setup_dissector_table_t setup_dissectors[] = {
	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_DEVICE,
	  USB_HUB_REQUEST_CLEAR_FEATURE,
	  dissect_usb_hub_clear_hub_feature
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_CLEAR_FEATURE,
	  dissect_usb_hub_clear_port_feature
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_CLEAR_TT_BUFFER,
	  dissect_usb_hub_clear_tt_buffer
	},

	{ USB_DIR_IN | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_DEVICE,
	  USB_HUB_REQUEST_GET_DESCRIPTOR,
	  dissect_usb_hub_get_hub_descriptor
	},

	{ USB_DIR_IN | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_DEVICE,
	  USB_HUB_REQUEST_GET_STATUS,
	  dissect_usb_hub_get_hub_status
	},

	{ USB_DIR_IN | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_GET_STATUS,
	  dissect_usb_hub_get_port_status
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_RESET_TT,
	  dissect_usb_hub_reset_tt
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_DEVICE,
	  USB_HUB_REQUEST_SET_DESCRIPTOR,
	  dissect_usb_hub_set_hub_descriptor
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_DEVICE,
	  USB_HUB_REQUEST_SET_FEATURE,
	  dissect_usb_hub_set_hub_feature
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_SET_FEATURE,
	  dissect_usb_hub_set_port_feature
	},

	{ USB_DIR_IN | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_GET_TT_STATE,
	  dissect_usb_hub_get_tt_state
	},

	{ USB_DIR_OUT | (RQT_SETUP_TYPE_CLASS << 5) | RQT_SETUP_RECIPIENT_OTHER,
	  USB_HUB_REQUEST_STOP_TT,
	  dissect_usb_hub_stop_tt
	},

	{ 0, 0, NULL }
};

/* Dissector for USB HUB class-specific control request as defined in
 * USB 2.0, Chapter 11.24.2 Class-specific Requests
 * Returns tvb_captured_length(tvb) if a class specific dissector was found
 * and 0 otherwise.
 */
static gint
dissect_usb_hub_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
	gboolean is_request;
	usb_conv_info_t *usb_conv_info;
	usb_trans_info_t *usb_trans_info;
	int offset = 0;
	usb_setup_dissector dissector;
	const usb_setup_dissector_table_t *tmp;

	/* Reject the packet if data or usb_trans_info are NULL */
	if (data == NULL || ((usb_conv_info_t *)data)->usb_trans_info == NULL)
		return 0;
	usb_conv_info = (usb_conv_info_t *)data;
	usb_trans_info = usb_conv_info->usb_trans_info;

	is_request = (pinfo->srcport==NO_ENDPOINT);

	/* See if we can find a class specific dissector for this request */
	dissector = NULL;

	/* Check valid values for bmRequestType and bRequest */
	for (tmp = setup_dissectors; tmp->dissector; tmp++) {
		if (tmp->request_type == usb_trans_info->setup.requesttype &&
		    tmp->request == usb_trans_info->setup.request) {
			dissector = tmp->dissector;
			break;
		}
	}
	/* No, we could not find any class specific dissector for this request
	 * return 0 and let USB try any of the standard requests.
	 */
	if (!dissector) {
		return 0;
	}

	col_set_str(pinfo->cinfo, COL_PROTOCOL, "USBHUB");

	col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s",
	val_to_str(usb_trans_info->setup.request, setup_request_names_vals, "Unknown type %x"),
		is_request ? "Request " : "Response");

	if (is_request) {
		proto_tree_add_item(tree, hf_usb_hub_request, tvb, offset, 1, ENC_LITTLE_ENDIAN);
		offset += 1;
	}

	dissector(pinfo, tree, tvb, offset, is_request, usb_trans_info, usb_conv_info);
	return tvb_captured_length(tvb);
}

void
proto_register_usb_hub(void)
{
	static hf_register_info hf[] = {
		/* USB HUB specific requests */
		{ &hf_usb_hub_request,
		{ "bRequest", "usbhub.setup.bRequest", FT_UINT8, BASE_HEX, VALS(setup_request_names_vals), 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_value,
		{ "wValue", "usbhub.setup.wValue", FT_UINT16, BASE_HEX, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_index,
		{ "wIndex", "usbhub.setup.wIndex", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_length,
		{ "wLength", "usbhub.setup.wLength", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_hub_feature_selector,
		{ "HubFeatureSelector", "usbhub.setup.HubFeatureSelector", FT_UINT16, BASE_DEC,
		  VALS(hub_class_feature_selectors_recipient_hub_vals), 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port_feature_selector,
		{ "PortFeatureSelector", "usbhub.setup.PortFeatureSelector", FT_UINT16, BASE_DEC,
		  VALS(hub_class_feature_selectors_recipient_port_vals), 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_dev_addr,
		{ "Dev_Addr", "usbhub.setup.Dev_Addr", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_ep_num,
		{ "EP_Num", "usbhub.setup.EP_Num", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_descriptor_type,
		{ "DescriptorType", "usbhub.setup.DescriptorType", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_descriptor_index,
		{ "DescriptorIndex", "usbhub.setup.DescriptorIndex", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_descriptor_length,
		{ "DescriptorLength", "usbhub.setup.DescriptorLength", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_zero,
		{ "(zero)", "usbhub.setup.zero", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_tt_flags,
		{ "TT_Flags", "usbhub.setup.TT_Flags", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_tt_port,
		{ "TT_Port", "usbhub.setup.TT_Port", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_tt_state_length,
		{ "TT State Length", "usbhub.setup.TT_StateLength", FT_UINT16, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port_selector,
		{ "PortSelector", "usbhub.setup.PortSelector", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port,
		{ "Port", "usbhub.setup.Port", FT_UINT8, BASE_DEC, NULL, 0x0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status,
		{ "Port Status", "usbhub.status.port", FT_UINT16, BASE_HEX, NULL, 0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change,
		{ "Port Change", "usbhub.change.port", FT_UINT16, BASE_HEX, NULL, 0,
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_connection,
		{ "PORT_CONNECTION", "usbhub.status.port.connection", FT_BOOLEAN, 16, NULL, (1<<0),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_enable,
		{ "PORT_ENABLE", "usbhub.status.port.enable", FT_BOOLEAN, 16, NULL, (1<<1),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_suspend,
		{ "PORT_SUSPEND", "usbhub.status.port.suspend", FT_BOOLEAN, 16, NULL, (1<<2),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_overcurrent,
		{ "PORT_OVER_CURRENT", "usbhub.status.port.overcurrent", FT_BOOLEAN, 16, NULL, (1<<3),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_reset,
		{ "PORT_RESET", "usbhub.status.port.reset", FT_BOOLEAN, 16, NULL, (1<<4),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_power,
		{ "PORT_POWER", "usbhub.status.port.power", FT_BOOLEAN, 16, NULL, (1<<8),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_low_speed,
		{ "PORT_LOW_SPEED", "usbhub.status.port.low_speed", FT_BOOLEAN, 16, NULL, (1<<9),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_high_speed,
		{ "PORT_HIGH_SPEED", "usbhub.status.port.high_speed", FT_BOOLEAN, 16, NULL, (1<<10),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_test,
		{ "PORT_TEST", "usbhub.status.port.test", FT_BOOLEAN, 16, NULL, (1<<11),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_status_indicator,
		{ "PORT_INDICATOR", "usbhub.status.port.indicator", FT_BOOLEAN, 16,
		  TFS(&hub_port_status_indicator_meaning), (1<<12),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change_connection,
		{ "C_PORT_CONNECTION", "usbhub.change.port.connection", FT_BOOLEAN, 16, NULL, (1<<0),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change_enable,
		{ "C_PORT_ENABLE", "usbhub.change.port.enable", FT_BOOLEAN, 16, NULL, (1<<1),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change_suspend,
		{ "C_PORT_SUSPEND", "usbhub.status.port.suspend", FT_BOOLEAN, 16, NULL, (1<<2),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change_overcurrent,
		{ "C_PORT_OVER_CURRENT", "usbhub.status.port.overcurrent", FT_BOOLEAN, 16, NULL, (1<<3),
		  NULL, HFILL }},

		{ &hf_usb_hub_port_change_reset,
		{ "C_PORT_RESET", "usbhub.status.port.reset", FT_BOOLEAN, 16, NULL, (1<<4),
		  NULL, HFILL }}
	};

	static gint *usb_hub_subtrees[] = {
		&ett_usb_hub_wValue,
		&ett_usb_hub_wIndex,
		&ett_usb_hub_wLength,
		&ett_usb_hub_port_status,
		&ett_usb_hub_port_change
	};

	proto_usb_hub = proto_register_protocol("USB HUB", "USBHUB", "usbhub");
	proto_register_field_array(proto_usb_hub, hf, array_length(hf));
	proto_register_subtree_array(usb_hub_subtrees, array_length(usb_hub_subtrees));
}

void
proto_reg_handoff_usb_hub(void)
{
	dissector_handle_t usb_hub_control_handle;

	usb_hub_control_handle = create_dissector_handle(dissect_usb_hub_control, proto_usb_hub);
	dissector_add_uint("usb.control", IF_CLASS_HUB, usb_hub_control_handle);
	dissector_add_uint("usb.control", IF_CLASS_UNKNOWN, usb_hub_control_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 8
 * tab-width: 8
 * indent-tabs-mode: t
 * End:
 *
 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 * :indentSize=8:tabSize=8:noTabs=false:
 */
