cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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usbip_device_driver.c (3789B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
      4 *		 2015 Samsung Electronics
      5 * Author:	 Igor Kotrasinski <i.kotrasinsk@samsung.com>
      6 *
      7 * Based on tools/usb/usbip/libsrc/usbip_host_driver.c, which is:
      8 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
      9 *               2005-2007 Takahiro Hirofuchi
     10 */
     11
     12#include <fcntl.h>
     13#include <string.h>
     14#include <linux/usb/ch9.h>
     15
     16#include <unistd.h>
     17
     18#include "usbip_host_common.h"
     19#include "usbip_device_driver.h"
     20
     21#undef  PROGNAME
     22#define PROGNAME "libusbip"
     23
     24#define copy_descr_attr16(dev, descr, attr)			\
     25		((dev)->attr = le16toh((descr)->attr))		\
     26
     27#define copy_descr_attr(dev, descr, attr)			\
     28		((dev)->attr = (descr)->attr)			\
     29
     30#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
     31
     32static struct {
     33	enum usb_device_speed speed;
     34	const char *name;
     35} speed_names[] = {
     36	{
     37		.speed = USB_SPEED_UNKNOWN,
     38		.name = "UNKNOWN",
     39	},
     40	{
     41		.speed = USB_SPEED_LOW,
     42		.name = "low-speed",
     43	},
     44	{
     45		.speed = USB_SPEED_FULL,
     46		.name = "full-speed",
     47	},
     48	{
     49		.speed = USB_SPEED_HIGH,
     50		.name = "high-speed",
     51	},
     52	{
     53		.speed = USB_SPEED_WIRELESS,
     54		.name = "wireless",
     55	},
     56	{
     57		.speed = USB_SPEED_SUPER,
     58		.name = "super-speed",
     59	},
     60};
     61
     62static
     63int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev)
     64{
     65	const char *path, *name;
     66	char filepath[SYSFS_PATH_MAX];
     67	struct usb_device_descriptor descr;
     68	unsigned int i;
     69	FILE *fd = NULL;
     70	struct udev_device *plat;
     71	const char *speed;
     72	size_t ret;
     73
     74	plat = udev_device_get_parent(sdev);
     75	path = udev_device_get_syspath(plat);
     76	snprintf(filepath, SYSFS_PATH_MAX, "%s/%s",
     77		 path, VUDC_DEVICE_DESCR_FILE);
     78	fd = fopen(filepath, "r");
     79	if (!fd)
     80		return -1;
     81	ret = fread((char *) &descr, sizeof(descr), 1, fd);
     82	if (ret != 1) {
     83		err("Cannot read vudc device descr file: %s", strerror(errno));
     84		goto err;
     85	}
     86	fclose(fd);
     87
     88	copy_descr_attr(dev, &descr, bDeviceClass);
     89	copy_descr_attr(dev, &descr, bDeviceSubClass);
     90	copy_descr_attr(dev, &descr, bDeviceProtocol);
     91	copy_descr_attr(dev, &descr, bNumConfigurations);
     92	copy_descr_attr16(dev, &descr, idVendor);
     93	copy_descr_attr16(dev, &descr, idProduct);
     94	copy_descr_attr16(dev, &descr, bcdDevice);
     95
     96	strncpy(dev->path, path, SYSFS_PATH_MAX - 1);
     97	dev->path[SYSFS_PATH_MAX - 1] = '\0';
     98
     99	dev->speed = USB_SPEED_UNKNOWN;
    100	speed = udev_device_get_sysattr_value(sdev, "current_speed");
    101	if (speed) {
    102		for (i = 0; i < ARRAY_SIZE(speed_names); i++) {
    103			if (!strcmp(speed_names[i].name, speed)) {
    104				dev->speed = speed_names[i].speed;
    105				break;
    106			}
    107		}
    108	}
    109
    110	/* Only used for user output, little sense to output them in general */
    111	dev->bNumInterfaces = 0;
    112	dev->bConfigurationValue = 0;
    113	dev->busnum = 0;
    114
    115	name = udev_device_get_sysname(plat);
    116	strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE - 1);
    117	dev->busid[SYSFS_BUS_ID_SIZE - 1] = '\0';
    118	return 0;
    119err:
    120	fclose(fd);
    121	return -1;
    122}
    123
    124static int is_my_device(struct udev_device *dev)
    125{
    126	const char *driver;
    127
    128	driver = udev_device_get_property_value(dev, "USB_UDC_NAME");
    129	return driver != NULL && !strcmp(driver, USBIP_DEVICE_DRV_NAME);
    130}
    131
    132static int usbip_device_driver_open(struct usbip_host_driver *hdriver)
    133{
    134	int ret;
    135
    136	hdriver->ndevs = 0;
    137	INIT_LIST_HEAD(&hdriver->edev_list);
    138
    139	ret = usbip_generic_driver_open(hdriver);
    140	if (ret)
    141		err("please load " USBIP_CORE_MOD_NAME ".ko and "
    142		    USBIP_DEVICE_DRV_NAME ".ko!");
    143
    144	return ret;
    145}
    146
    147struct usbip_host_driver device_driver = {
    148	.edev_list = LIST_HEAD_INIT(device_driver.edev_list),
    149	.udev_subsystem = "udc",
    150	.ops = {
    151		.open = usbip_device_driver_open,
    152		.close = usbip_generic_driver_close,
    153		.refresh_device_list = usbip_generic_refresh_device_list,
    154		.get_device = usbip_generic_get_device,
    155		.read_device = read_usb_vudc_device,
    156		.is_my_device = is_my_device,
    157	},
    158};