path: root/drivers/usb/usbip/usbip_common.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 * Copyright (C) 2015-2016 Samsung Electronics
 *               Krzysztof Opasiak <k.opasiak@samsung.com>
 */

#include <asm/byteorder.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <net/sock.h>

#include "usbip_common.h"

#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
#define DRIVER_DESC "USB/IP Core"

#ifdef CONFIG_USBIP_DEBUG
unsigned long usbip_debug_flag = 0xffffffff;
#else
unsigned long usbip_debug_flag;
#endif
EXPORT_SYMBOL_GPL(usbip_debug_flag);
module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");

/* FIXME */
struct device_attribute dev_attr_usbip_debug;
EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);

static ssize_t usbip_debug_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%lx\n", usbip_debug_flag);
}

static ssize_t usbip_debug_store(struct device *dev,
				 struct device_attribute *attr, const char *buf,
				 size_t count)
{
	if (sscanf(buf, "%lx", &usbip_debug_flag) != 1)
		return -EINVAL;
	return count;
}
DEVICE_ATTR_RW(usbip_debug);

static void usbip_dump_buffer(char *buff, int bufflen)
{
	print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
		       buff, bufflen, false);
}

static void usbip_dump_pipe(unsigned int p)
{
	unsigned char type = usb_pipetype(p);
	unsigned char ep   = usb_pipeendpoint(p);
	unsigned char dev  = usb_pipedevice(p);
	unsigned char dir  = usb_pipein(p);

	pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");

	switch (type) {
	case PIPE_ISOCHRONOUS:
		pr_debug("ISO\n");
		break;
	case PIPE_INTERRUPT:
		pr_debug("INT\n");
		break;
	case PIPE_CONTROL:
		pr_debug("CTRL\n");
		break;
	case PIPE_BULK:
		pr_debug("BULK\n");
		break;
	default:
		pr_debug("ERR\n");
		break;
	}
}

static void usbip_dump_usb_device(struct usb_device *udev)
{
	struct device *dev = &udev->dev;
	int i;

	dev_dbg(dev, "       devnum(%d) devpath(%s) usb speed(%s)",
		udev->devnum, udev->devpath, usb_speed_string(udev->speed));

	pr_debug("tt hub ttport %d\n", udev->ttport);

	dev_dbg(dev, "                    ");
	for (i = 0; i < 16; i++)
		pr_debug(" %2u", i);
	pr_debug("\n");

	dev_dbg(dev, "       toggle0(IN) :");
	for (i = 0; i < 16; i++)
		pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
	pr_debug("\n");

	dev_dbg(dev, "       toggle1(OUT):");
	for (i = 0; i < 16; i++)
		pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
	pr_debug("\n");

	dev_dbg(dev, "       epmaxp_in   :");
	for (i = 0; i < 16; i++) {
		if (udev->ep_in[i])
			pr_debug(" %2u",
			    le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
	}
	pr_debug("\n");

	dev_dbg(dev, "       epmaxp_out  :");
	for (i = 0; i < 16; i++) {
		if (udev->ep_out[i])
			pr_debug(" %2u",
			    le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
	}
	pr_debug("\n");

	dev_dbg(dev, "parent %s, bus %s\n", dev_name(&udev->parent->dev),
		udev->bus->bus_name);

	dev_dbg(dev, "have_langid %d, string_langid %d\n",
		udev->have_langid, udev->string_langid);

	dev_dbg(dev, "maxchild %d\n", udev->maxchild);
}

static void usbip_dump_request_type(__u8 rt)
{
	switch (rt & USB_RECIP_MASK) {
	case USB_RECIP_DEVICE:
		pr_debug("DEVICE");
		break;
	case USB_RECIP_INTERFACE:
		pr_debug("INTERF");
		break;
	case USB_RECIP_ENDPOINT:
		pr_debug("ENDPOI");
		break;
	case USB_RECIP_OTHER:
		pr_debug("OTHER ");
		break;
	default:
		pr_debug("------");
		break;
	}
}

static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
{
	if (!cmd) {
		pr_debug("       : null pointer\n"<