--- /dev/null
+/*****************************************************************************/
+
+/*
+ * devio.c -- User space communication with USB devices.
+ *
+ * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * This file implements the usbfs/x/y files, where
+ * x is the bus number and y the device number.
+ *
+ * It allows user space programs/"drivers" to communicate directly
+ * with USB devices without intervening kernel driver.
+ *
+ * Revision history
+ * 22.12.1999 0.1 Initial release (split from proc_usb.c)
+ * 04.01.2000 0.2 Turned into its own filesystem
+ * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
+ * (CAN-2005-3055)
+ */
+
+/*****************************************************************************/
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/signal.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <linux/usb/hcd.h> /* for usbcore internals */
+#include <linux/cdev.h>
+#include <linux/notifier.h>
+#include <linux/security.h>
+#include <linux/user_namespace.h>
+#include <linux/scatterlist.h>
+#include <linux/uaccess.h>
+#include <asm/byteorder.h>
+#include <linux/moduleparam.h>
+
+#include "usb.h"
+
+#define USB_MAXBUS 64
+#define USB_DEVICE_MAX (USB_MAXBUS * 128)
+#define USB_SG_SIZE 16384 /* split-size for large txs */
+
+/* Mutual exclusion for removal, open, and release */
+DEFINE_MUTEX(usbfs_mutex);
+
+struct usb_dev_state {
+ struct list_head list; /* state list */
+ struct usb_device *dev;
+ struct file *file;
+ spinlock_t lock; /* protects the async urb lists */
+ struct list_head async_pending;
+ struct list_head async_completed;
+ wait_queue_head_t wait; /* wake up if a request completed */
+ unsigned int discsignr;
+ struct pid *disc_pid;
+ const struct cred *cred;
+ void __user *disccontext;
+ unsigned long ifclaimed;
+ u32 secid;
+ u32 disabled_bulk_eps;
+};
+
+struct async {
+ struct list_head asynclist;
+ struct usb_dev_state *ps;
+ struct pid *pid;
+ const struct cred *cred;
+ unsigned int signr;
+ unsigned int ifnum;
+ void __user *userbuffer;
+ void __user *userurb;
+ struct urb *urb;
+ unsigned int mem_usage;
+ int status;
+ u32 secid;
+ u8 bulk_addr;
+ u8 bulk_status;
+};
+
+static bool usbfs_snoop;
+module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
+
+#define snoop(dev, format, arg...) \
+ do { \
+ if (usbfs_snoop) \
+ dev_info(dev , format , ## arg); \
+ } while (0)
+
+enum snoop_when {
+ SUBMIT, COMPLETE
+};
+
+#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
+
+/* Limit on the total amount of memory we can allocate for transfers */
+static unsigned usbfs_memory_mb = 16;
+module_param(usbfs_memory_mb, uint, 0644);
+MODULE_PARM_DESC(usbfs_memory_mb,
+ "maximum MB allowed for usbfs buffers (0 = no limit)");
+
+/* Hard limit, necessary to avoid arithmetic overflow */
+#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
+
+static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
+
+/* Check whether it's okay to allocate more memory for a transfer */
+static int usbfs_increase_memory_usage(unsigned amount)
+{
+ unsigned lim;
+
+ /*
+ * Convert usbfs_memory_mb to bytes, avoiding overflows.
+ * 0 means use the hard limit (effectively unlimited).
+ */
+ lim = ACCESS_ONCE(usbfs_memory_mb);
+ if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
+ lim = USBFS_XFER_MAX;
+ else
+ lim <<= 20;
+
+ atomic_add(amount, &usbfs_memory_usage);
+ if (atomic_read(&usbfs_memory_usage) <= lim)
+ return 0;
+ atomic_sub(amount, &usbfs_memory_usage);
+ return -ENOMEM;
+}
+
+/* Memory for a transfer is being deallocated */
+static void usbfs_decrease_memory_usage(unsigned amount)
+{
+ atomic_sub(amount, &usbfs_memory_usage);
+}
+
+static int connected(struct usb_dev_state *ps)
+{
+ return (!list_empty(&ps->list) &&
+ ps->dev->state != USB_STATE_NOTATTACHED);
+}
+
+static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
+{
+ loff_t ret;
+
+ mutex_lock(&file_inode(file)->i_mutex);
+
+ switch (orig) {
+ case 0:
+ file->f_pos = offset;
+ ret = file->f_pos;
+ break;
+ case 1:
+ file->f_pos += offset;
+ ret = file->f_pos;
+ break;
+ case 2:
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&file_inode(file)->i_mutex);
+ return ret;
+}
+
+static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
+ loff_t *ppos)
+{
+ struct usb_dev_state *ps = file->private_data;
+ struct usb_device *dev = ps->dev;
+ ssize_t ret = 0;
+ unsigned len;
+ loff_t pos;
+ int i;
+
+ pos = *ppos;
+ usb_lock_device(dev);
+ if (!connected(ps)) {
+ ret = -ENODEV;
+ goto err;
+ } else if (pos < 0) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (pos < sizeof(struct usb_device_descriptor)) {
+ /* 18 bytes - fits on the stack */
+ struct usb_device_descriptor temp_desc;
+
+ memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
+ le16_to_cpus(&temp_desc.bcdUSB);
+ le16_to_cpus(&temp_desc.idVendor);
+ le16_to_cpus(&temp_desc.idProduct);
+ le16_to_cpus(&temp_desc.bcdDevice);
+
+ len = sizeof(struct usb_device_descriptor) - pos;
+ if (len > nbytes)
+ len = nbytes;
+ if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+ *ppos += len;
+ buf += len;
+ nbytes -= len;
+ ret += len;
+ }
+
+ pos = sizeof(struct usb_device_descriptor);
+ for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
+ struct usb_config_descriptor *config =
+ (struct usb_config_descriptor *)dev->rawdescriptors[i];
+ unsigned int length = le16_to_cpu(config->wTotalLength);
+
+ if (*ppos < pos + length) {
+
+ /* The descriptor may claim to be longer than it
+ * really is. Here is the actual allocated length. */
+ unsigned alloclen =
+ le16_to_cpu(dev->config[i].desc.wTotalLength);
+
+ len = length - (*ppos - pos);
+ if (len > nbytes)
+ len = nbytes;
+
+ /* Simply don't write (skip over) unallocated parts */
+ if (alloclen > (*ppos - pos)) {
+ alloclen -= (*ppos - pos);
+ if (copy_to_user(buf,
+ dev->rawdescriptors[i] + (*ppos - pos),
+ min(len, alloclen))) {
+ ret = -EFAULT;
+ goto err;
+ }
+ }
+
+ *ppos += len;
+ buf += len;
+ nbytes -= len;
+ ret += len;
+ }
+
+ pos += length;
+ }
+
+err:
+ usb_unlock_device(dev);
+ return ret;
+}
+
+/*
+ * async list handling
+ */
+
+static struct async *alloc_async(unsigned int numisoframes)
+{
+ struct async *as;
+
+ as = kzalloc(sizeof(struct async), GFP_KERNEL);
+ if (!as)
+ return NULL;
+ as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
+ if (!as->urb) {
+ kfree(as);
+ return NULL;
+ }
+ return as;
+}
+
+static void free_async(struct async *as)
+{
+ int i;
+
+ put_pid(as->pid);
+ if (as->cred)
+ put_cred(as->cred);
+ for (i = 0; i < as->urb->num_sgs; i++) {
+ if (sg_page(&as->urb->sg[i]))
+ kfree(sg_virt(&as->urb->sg[i]));
+ }
+ kfree(as->urb->sg);
+ kfree(as->urb->transfer_buffer);
+ kfree(as->urb->setup_packet);
+ usb_free_urb(as->urb);
+ usbfs_decrease_memory_usage(as->mem_usage);
+ kfree(as);
+}
+
+static void async_newpending(struct async *as)
+{
+ struct usb_dev_state *ps = as->ps;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ps->lock, flags);
+ list_add_tail(&as->asynclist, &ps->async_pending);
+ spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static void async_removepending(struct async *as)
+{
+ struct usb_dev_state *ps = as->ps;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ps->lock, flags);
+ list_del_init(&as->asynclist);
+ spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static struct async *async_getcompleted(struct usb_dev_state *ps)
+{
+ unsigned long flags;
+ struct async *as = NULL;
+
+ spin_lock_irqsave(&ps->lock, flags);
+ if (!list_empty(&ps->async_completed)) {
+ as = list_entry(ps->async_completed.next, struct async,
+ asynclist);
+ list_del_init(&as->asynclist);
+ }
+ spin_unlock_irqrestore(&ps->lock, flags);
+ return as;
+}
+
+static struct async *async_getpending(struct usb_dev_state *ps,
+ void __user *userurb)
+{
+ struct async *as;
+
+ list_for_each_entry(as, &ps->async_pending, asynclist)
+ if (as->userurb == userurb) {
+ list_del_init(&as->asynclist);
+ return as;
+ }
+
+ return NULL;
+}
+
+static void snoop_urb(struct usb_device *udev,
+ void __user *userurb, int pipe, unsigned length,
+ int timeout_or_status, enum snoop_when when,
+ unsigned char *data, unsigned data_len)
+{
+ static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
+ static const char *dirs[] = {"out", "in"};
+ int ep;
+ const char *t, *d;
+
+ if (!usbfs_snoop)
+ return;
+
+ ep = usb_pipeendpoint(pipe);
+ t = types[usb_pipetype(pipe)];
+ d = dirs[!!usb_pipein(pipe)];
+
+ if (userurb) { /* Async */
+ if (when == SUBMIT)
+ dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
+ "length %u\n",
+ userurb, ep, t, d, length);
+ else
+ dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
+ "actual_length %u status %d\n",
+ userurb, ep, t, d, length,
+ timeout_or_status);
+ } else {
+ if (when == SUBMIT)
+ dev_info(&udev->dev, "ep%d %s-%s, length %u, "
+ "timeout %d\n",
+ ep, t, d, length, timeout_or_status);
+ else
+ dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
+ "status %d\n",
+ ep, t, d, length, timeout_or_status);
+ }
+
+ if (data && data_len > 0) {
+ print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+ data, data_len, 1);
+ }
+}
+
+static void snoop_urb_data(struct urb *urb, unsigned len)
+{
+ int i, size;
+
+ if (!usbfs_snoop)
+ return;
+
+ if (urb->num_sgs == 0) {
+ print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+ urb->transfer_buffer, len, 1);
+ return;
+ }
+
+ for (i = 0; i < urb->num_sgs && len; i++) {
+ size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
+ print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+ sg_virt(&urb->sg[i]), size, 1);
+ len -= size;
+ }
+}
+
+static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
+{
+ unsigned i, len, size;
+
+ if (urb->number_of_packets > 0) /* Isochronous */
+ len = urb->transfer_buffer_length;
+ else /* Non-Isoc */
+ len = urb->actual_length;
+
+ if (urb->num_sgs == 0) {
+ if (copy_to_user(userbuffer, urb->transfer_buffer, len))
+ return -EFAULT;
+ return 0;
+ }
+
+ for (i = 0; i < urb->num_sgs && len; i++) {
+ size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
+ if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
+ return -EFAULT;
+ userbuffer += size;
+ len -= size;
+ }
+
+ return 0;
+}
+
+#define AS_CONTINUATION 1
+#define AS_UNLINK 2
+
+static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
+__releases(ps->lock)
+__acquires(ps->lock)
+{
+ struct urb *urb;
+ struct async *as;
+
+ /* Mark all the pending URBs that match bulk_addr, up to but not
+ * including the first one without AS_CONTINUATION. If such an
+ * URB is encountered then a new transfer has already started so
+ * the endpoint doesn't need to be disabled; otherwise it does.
+ */
+ list_for_each_entry(as, &ps->async_pending, asynclist) {
+ if (as->bulk_addr == bulk_addr) {
+ if (as->bulk_status != AS_CONTINUATION)
+ goto rescan;
+ as->bulk_status = AS_UNLINK;
+ as->bulk_addr = 0;
+ }
+ }
+ ps->disabled_bulk_eps |= (1 << bulk_addr);
+
+ /* Now carefully unlink all the marked pending URBs */
+ rescan:
+ list_for_each_entry(as, &ps->async_pending, asynclist) {
+ if (as->bulk_status == AS_UNLINK) {
+ as->bulk_status = 0; /* Only once */
+ urb = as->urb;
+ usb_get_urb(urb);
+ spin_unlock(&ps->lock); /* Allow completions */
+ usb_unlink_urb(urb);
+ usb_put_urb(urb);
+ spin_lock(&ps->lock);
+ goto rescan;
+ }
+ }
+}
+
+static void async_completed(struct urb *urb)
+{
+ struct async *as = urb->context;
+ struct usb_dev_state *ps = as->ps;
+ struct siginfo sinfo;
+ struct pid *pid = NULL;
+ u32 secid = 0;
+ const struct cred *cred = NULL;
+ int signr;
+
+ spin_lock(&ps->lock);
+ list_move_tail(&as->asynclist, &ps->async_completed);
+ as->status = urb->status;
+ signr = as->signr;
+ if (signr) {
+ memset(&sinfo, 0, sizeof(sinfo));
+ sinfo.si_signo = as->signr;
+ sinfo.si_errno = as->status;
+ sinfo.si_code = SI_ASYNCIO;
+ sinfo.si_addr = as->userurb;
+ pid = get_pid(as->pid);
+ cred = get_cred(as->cred);
+ secid = as->secid;
+ }
+ snoop(&urb->dev->dev, "urb complete\n");
+ snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
+ as->status, COMPLETE, NULL, 0);
+ if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
+ snoop_urb_data(urb, urb->actual_length);
+
+ if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
+ as->status != -ENOENT)
+ cancel_bulk_urbs(ps, as->bulk_addr);
+ spin_unlock(&ps->lock);
+
+ if (signr) {
+ kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
+ put_pid(pid);
+ put_cred(cred);
+ }
+
+ wake_up(&ps->wait);
+}
+
+static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
+{
+ struct urb *urb;
+ struct async *as;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ps->lock, flags);
+ while (!list_empty(list)) {
+ as = list_entry(list->next, struct async, asynclist);
+ list_del_init(&as->asynclist);
+ urb = as->urb;
+ usb_get_urb(urb);
+
+ /* drop the spinlock so the completion handler can run */
+ spin_unlock_irqrestore(&ps->lock, flags);
+ usb_kill_urb(urb);
+ usb_put_urb(urb);
+ spin_lock_irqsave(&ps->lock, flags);
+ }
+ spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static void destroy_async_on_interface(struct usb_dev_state *ps,
+ unsigned int ifnum)
+{
+ struct list_head *p, *q, hitlist;
+ unsigned long flags;
+
+ INIT_LIST_HEAD(&hitlist);
+ spin_lock_irqsave(&ps->lock, flags);
+ list_for_each_safe(p, q, &ps->async_pending)
+ if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
+ list_move_tail(p, &hitlist);
+ spin_unlock_irqrestore(&ps->lock, flags);
+ destroy_async(ps, &hitlist);
+}
+
+static void destroy_all_async(struct usb_dev_state *ps)
+{
+ destroy_async(ps, &ps->async_pending);
+}
+
+/*
+ * interface claims are made only at the request of user level code,
+ * which can also release them (explicitly or by closing files).
+ * they're also undone when devices disconnect.
+ */
+
+static int driver_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ return -ENODEV;
+}
+
+static void driver_disconnect(struct usb_interface *intf)
+{
+ struct usb_dev_state *ps = usb_get_intfdata(intf);
+ unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
+
+ if (!ps)
+ return;
+
+ /* NOTE: this relies on usbcore having canceled and completed
+ * all pending I/O requests; 2.6 does that.
+ */
+
+ if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
+ clear_bit(ifnum, &ps->ifclaimed);
+ else
+ dev_warn(&intf->dev, "interface number %u out of range\n",
+ ifnum);
+
+ usb_set_intfdata(intf, NULL);
+
+ /* force async requests to complete */
+ destroy_async_on_interface(ps, ifnum);
+}
+
+/* The following routines are merely placeholders. There is no way
+ * to inform a user task about suspend or resumes.
+ */
+static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
+{
+ return 0;
+}
+
+static int driver_resume(struct usb_interface *intf)
+{
+ return 0;
+}
+
+struct usb_driver usbfs_driver = {
+ .name = "usbfs",
+ .probe = driver_probe,
+ .disconnect = driver_disconnect,
+ .suspend = driver_suspend,
+ .resume = driver_resume,
+};
+
+static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+ struct usb_device *dev = ps->dev;
+ struct usb_interface *intf;
+ int err;
+
+ if (ifnum >= 8*sizeof(ps->ifclaimed))
+ return -EINVAL;
+ /* already claimed */
+ if (test_bit(ifnum, &ps->ifclaimed))
+ return 0;
+
+ intf = usb_ifnum_to_if(dev, ifnum);
+ if (!intf)
+ err = -ENOENT;
+ else
+ err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
+ if (err == 0)
+ set_bit(ifnum, &ps->ifclaimed);
+ return err;
+}
+
+static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+ struct usb_device *dev;
+ struct usb_interface *intf;
+ int err;
+
+ err = -EINVAL;
+ if (ifnum >= 8*sizeof(ps->ifclaimed))
+ return err;
+ dev = ps->dev;
+ intf = usb_ifnum_to_if(dev, ifnum);
+ if (!intf)
+ err = -ENOENT;
+ else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
+ usb_driver_release_interface(&usbfs_driver, intf);
+ err = 0;
+ }
+ return err;
+}
+
+static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+ if (ps->dev->state != USB_STATE_CONFIGURED)
+ return -EHOSTUNREACH;
+ if (ifnum >= 8*sizeof(ps->ifclaimed))
+ return -EINVAL;
+ if (test_bit(ifnum, &ps->ifclaimed))
+ return 0;
+ /* if not yet claimed, claim it for the driver */
+ dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
+ "interface %u before use\n", task_pid_nr(current),
+ current->comm, ifnum);
+ return claimintf(ps, ifnum);
+}
+
+static int findintfep(struct usb_device *dev, unsigned int ep)
+{
+ unsigned int i, j, e;
+ struct usb_interface *intf;
+ struct usb_host_interface *alts;
+ struct usb_endpoint_descriptor *endpt;
+
+ if (ep & ~(USB_DIR_IN|0xf))
+ return -EINVAL;
+ if (!dev->actconfig)
+ return -ESRCH;
+ for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
+ intf = dev->actconfig->interface[i];
+ for (j = 0; j < intf->num_altsetting; j++) {
+ alts = &intf->altsetting[j];
+ for (e = 0; e < alts->desc.bNumEndpoints; e++) {
+ endpt = &alts->endpoint[e].desc;
+ if (endpt->bEndpointAddress == ep)
+ return alts->desc.bInterfaceNumber;
+ }
+ }
+ }
+ return -ENOENT;
+}
+
+static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
+ unsigned int request, unsigned int index)
+{
+ int ret = 0;
+ struct usb_host_interface *alt_setting;
+
+ if (ps->dev->state != USB_STATE_UNAUTHENTICATED
+ && ps->dev->state != USB_STATE_ADDRESS
+ && ps->dev->state != USB_STATE_CONFIGURED)
+ return -EHOSTUNREACH;
+ if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
+ return 0;
+
+ /*
+ * check for the special corner case 'get_device_id' in the printer
+ * class specification, which we always want to allow as it is used
+ * to query things like ink level, etc.
+ */
+ if (requesttype == 0xa1 && request == 0) {
+ alt_setting = usb_find_alt_setting(ps->dev->actconfig,
+ index >> 8, index & 0xff);
+ if (alt_setting
+ && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
+ return 0;
+ }
+
+ index &= 0xff;
+ switch (requesttype & USB_RECIP_MASK) {
+ case USB_RECIP_ENDPOINT:
+ if ((index & ~USB_DIR_IN) == 0)
+ return 0;
+ ret = findintfep(ps->dev, index);
+ if (ret < 0) {
+ /*
+ * Some not fully compliant Win apps seem to get
+ * index wrong and have the endpoint number here
+ * rather than the endpoint address (with the
+ * correct direction). Win does let this through,
+ * so we'll not reject it here but leave it to
+ * the device to not break KVM. But we warn.
+ */
+ ret = findintfep(ps->dev, index ^ 0x80);
+ if (ret >= 0)
+ dev_info(&ps->dev->dev,
+ "%s: process %i (%s) requesting ep %02x but needs %02x\n",
+ __func__, task_pid_nr(current),
+ current->comm, index, index ^ 0x80);
+ }
+ if (ret >= 0)
+ ret = checkintf(ps, ret);
+ break;
+
+ case USB_RECIP_INTERFACE:
+ ret = checkintf(ps, index);
+ break;
+ }
+ return ret;
+}
+
+static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
+ unsigned char ep)
+{
+ if (ep & USB_ENDPOINT_DIR_MASK)
+ return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
+ else
+ return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
+}
+
+static int parse_usbdevfs_streams(struct usb_dev_state *ps,
+ struct usbdevfs_streams __user *streams,
+ unsigned int *num_streams_ret,
+ unsigned int *num_eps_ret,
+ struct usb_host_endpoint ***eps_ret,
+ struct usb_interface **intf_ret)
+{
+ unsigned int i, num_streams, num_eps;
+ struct usb_host_endpoint **eps;
+ struct usb_interface *intf = NULL;
+ unsigned char ep;
+ int ifnum, ret;
+
+ if (get_user(num_streams, &streams->num_streams) ||
+ get_user(num_eps, &streams->num_eps))
+ return -EFAULT;
+
+ if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
+ return -EINVAL;
+
+ /* The XHCI controller allows max 2 ^ 16 streams */
+ if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
+ return -EINVAL;
+
+ eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
+ if (!eps)
+ return -ENOMEM;
+
+ for (i = 0; i < num_eps; i++) {
+ if (get_user(ep, &streams->eps[i])) {
+ ret = -EFAULT;
+ goto error;
+ }
+ eps[i] = ep_to_host_endpoint(ps->dev, ep);
+ if (!eps[i]) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /* usb_alloc/free_streams operate on an usb_interface */
+ ifnum = findintfep(ps->dev, ep);
+ if (ifnum < 0) {
+ ret = ifnum;
+ goto error;
+ }
+
+ if (i == 0) {
+ ret = checkintf(ps, ifnum);
+ if (ret < 0)
+ goto error;
+ intf = usb_ifnum_to_if(ps->dev, ifnum);
+ } else {
+ /* Verify all eps belong to the same interface */
+ if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
+ ret = -EINVAL;
+ goto error;
+ }
+ }
+ }
+
+ if (num_streams_ret)
+ *num_streams_ret = num_streams;
+ *num_eps_ret = num_eps;
+ *eps_ret = eps;
+ *intf_ret = intf;
+
+ return 0;
+
+error:
+ kfree(eps);
+ return ret;
+}
+
+static int match_devt(struct device *dev, void *data)
+{
+ return dev->devt == (dev_t) (unsigned long) data;
+}
+
+static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&usb_bus_type, NULL,
+ (void *) (unsigned long) devt, match_devt);
+ if (!dev)
+ return NULL;
+ return container_of(dev, struct usb_device, dev);
+}
+
+/*
+ * file operations
+ */
+static int usbdev_open(struct inode *inode, struct file *file)
+{
+ struct usb_device *dev = NULL;
+ struct usb_dev_state *ps;
+ int ret;
+
+ ret = -ENOMEM;
+ ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
+ if (!ps)
+ goto out_free_ps;
+
+ ret = -ENODEV;
+
+ /* Protect against simultaneous removal or release */
+ mutex_lock(&usbfs_mutex);
+
+ /* usbdev device-node */
+ if (imajor(inode) == USB_DEVICE_MAJOR)
+ dev = usbdev_lookup_by_devt(inode->i_rdev);
+
+ mutex_unlock(&usbfs_mutex);
+
+ if (!dev)
+ goto out_free_ps;
+
+ usb_lock_device(dev);
+ if (dev->state == USB_STATE_NOTATTACHED)
+ goto out_unlock_device;
+
+ ret = usb_autoresume_device(dev);
+ if (ret)
+ goto out_unlock_device;
+
+ ps->dev = dev;
+ ps->file = file;
+ spin_lock_init(&ps->lock);
+ INIT_LIST_HEAD(&ps->list);
+ INIT_LIST_HEAD(&ps->async_pending);
+ INIT_LIST_HEAD(&ps->async_completed);
+ init_waitqueue_head(&ps->wait);
+ ps->discsignr = 0;
+ ps->disc_pid = get_pid(task_pid(current));
+ ps->cred = get_current_cred();
+ ps->disccontext = NULL;
+ ps->ifclaimed = 0;
+ security_task_getsecid(current, &ps->secid);
+ smp_wmb();
+ list_add_tail(&ps->list, &dev->filelist);
+ file->private_data = ps;
+ usb_unlock_device(dev);
+ snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
+ current->comm);
+ return ret;
+
+ out_unlock_device:
+ usb_unlock_device(dev);
+ usb_put_dev(dev);
+ out_free_ps:
+ kfree(ps);
+ return ret;
+}
+
+static int usbdev_release(struct inode *inode, struct file *file)
+{
+ struct usb_dev_state *ps = file->private_data;
+ struct usb_device *dev = ps->dev;
+ unsigned int ifnum;
+ struct async *as;
+
+ usb_lock_device(dev);
+ usb_hub_release_all_ports(dev, ps);
+
+ list_del_init(&ps->list);
+
+ for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
+ ifnum++) {
+ if (test_bit(ifnum, &ps->ifclaimed))
+ releaseintf(ps, ifnum);
+ }
+ destroy_all_async(ps);
+ usb_autosuspend_device(dev);
+ usb_unlock_device(dev);
+ usb_put_dev(dev);
+ put_pid(ps->disc_pid);
+ put_cred(ps->cred);
+
+ as = async_getcompleted(ps);
+ while (as) {
+ free_async(as);
+ as = async_getcompleted(ps);
+ }
+ kfree(ps);
+ return 0;
+}
+
+static int proc_control(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usb_device *dev = ps->dev;
+ struct usbdevfs_ctrltransfer ctrl;
+ unsigned int tmo;
+ unsigned char *tbuf;
+ unsigned wLength;
+ int i, pipe, ret;
+
+ if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+ return -EFAULT;
+ ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
+ ctrl.wIndex);
+ if (ret)
+ return ret;
+ wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
+ if (wLength > PAGE_SIZE)
+ return -EINVAL;
+ ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
+ sizeof(struct usb_ctrlrequest));
+ if (ret)
+ return ret;
+ tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+ if (!tbuf) {
+ ret = -ENOMEM;
+ goto done;
+ }
+ tmo = ctrl.timeout;
+ snoop(&dev->dev, "control urb: bRequestType=%02x "
+ "bRequest=%02x wValue=%04x "
+ "wIndex=%04x wLength=%04x\n",
+ ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
+ ctrl.wIndex, ctrl.wLength);
+ if (ctrl.bRequestType & 0x80) {
+ if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
+ ctrl.wLength)) {
+ ret = -EINVAL;
+ goto done;
+ }
+ pipe = usb_rcvctrlpipe(dev, 0);
+ snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
+
+ usb_unlock_device(dev);
+ i = usb_control_msg(dev, pipe, ctrl.bRequest,
+ ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
+ tbuf, ctrl.wLength, tmo);
+ usb_lock_device(dev);
+ snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
+ tbuf, max(i, 0));
+ if ((i > 0) && ctrl.wLength) {
+ if (copy_to_user(ctrl.data, tbuf, i)) {
+ ret = -EFAULT;
+ goto done;
+ }
+ }
+ } else {
+ if (ctrl.wLength) {
+ if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
+ ret = -EFAULT;
+ goto done;
+ }
+ }
+ pipe = usb_sndctrlpipe(dev, 0);
+ snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
+ tbuf, ctrl.wLength);
+
+ usb_unlock_device(dev);
+ i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
+ ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
+ tbuf, ctrl.wLength, tmo);
+ usb_lock_device(dev);
+ snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
+ }
+ if (i < 0 && i != -EPIPE) {
+ dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
+ "failed cmd %s rqt %u rq %u len %u ret %d\n",
+ current->comm, ctrl.bRequestType, ctrl.bRequest,
+ ctrl.wLength, i);
+ }
+ ret = i;
+ done:
+ free_page((unsigned long) tbuf);
+ usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
+ sizeof(struct usb_ctrlrequest));
+ return ret;
+}
+
+static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usb_device *dev = ps->dev;
+ struct usbdevfs_bulktransfer bulk;
+ unsigned int tmo, len1, pipe;
+ int len2;
+ unsigned char *tbuf;
+ int i, ret;
+
+ if (copy_from_user(&bulk, arg, sizeof(bulk)))
+ return -EFAULT;
+ ret = findintfep(ps->dev, bulk.ep);
+ if (ret < 0)
+ return ret;
+ ret = checkintf(ps, ret);
+ if (ret)
+ return ret;
+ if (bulk.ep & USB_DIR_IN)
+ pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
+ else
+ pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
+ if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
+ return -EINVAL;
+ len1 = bulk.len;
+ if (len1 >= USBFS_XFER_MAX)
+ return -EINVAL;
+ ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
+ if (ret)
+ return ret;
+ if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
+ ret = -ENOMEM;
+ goto done;
+ }
+ tmo = bulk.timeout;
+ if (bulk.ep & 0x80) {
+ if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
+ ret = -EINVAL;
+ goto done;
+ }
+ snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
+
+ usb_unlock_device(dev);
+ i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
+ usb_lock_device(dev);
+ snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
+
+ if (!i && len2) {
+ if (copy_to_user(bulk.data, tbuf, len2)) {
+ ret = -EFAULT;
+ goto done;
+ }
+ }
+ } else {
+ if (len1) {
+ if (copy_from_user(tbuf, bulk.data, len1)) {
+ ret = -EFAULT;
+ goto done;
+ }
+ }
+ snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
+
+ usb_unlock_device(dev);
+ i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
+ usb_lock_device(dev);
+ snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
+ }
+ ret = (i < 0 ? i : len2);
+ done:
+ kfree(tbuf);
+ usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
+ return ret;
+}
+
+static void check_reset_of_active_ep(struct usb_device *udev,
+ unsigned int epnum, char *ioctl_name)
+{
+ struct usb_host_endpoint **eps;
+ struct usb_host_endpoint *ep;
+
+ eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
+ ep = eps[epnum & 0x0f];
+ if (ep && !list_empty(&ep->urb_list))
+ dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
+ task_pid_nr(current), current->comm,
+ ioctl_name, epnum);
+}
+
+static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned int ep;
+ int ret;
+
+ if (get_user(ep, (unsigned int __user *)arg))
+ return -EFAULT;
+ ret = findintfep(ps->dev, ep);
+ if (ret < 0)
+ return ret;
+ ret = checkintf(ps, ret);
+ if (ret)
+ return ret;
+ check_reset_of_active_ep(ps->dev, ep, "RESETEP");
+ usb_reset_endpoint(ps->dev, ep);
+ return 0;
+}
+
+static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned int ep;
+ int pipe;
+ int ret;
+
+ if (get_user(ep, (unsigned int __user *)arg))
+ return -EFAULT;
+ ret = findintfep(ps->dev, ep);
+ if (ret < 0)
+ return ret;
+ ret = checkintf(ps, ret);
+ if (ret)
+ return ret;
+ check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
+ if (ep & USB_DIR_IN)
+ pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
+ else
+ pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
+
+ return usb_clear_halt(ps->dev, pipe);
+}
+
+static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_getdriver gd;
+ struct usb_interface *intf;
+ int ret;
+
+ if (copy_from_user(&gd, arg, sizeof(gd)))
+ return -EFAULT;
+ intf = usb_ifnum_to_if(ps->dev, gd.interface);
+ if (!intf || !intf->dev.driver)
+ ret = -ENODATA;
+ else {
+ strlcpy(gd.driver, intf->dev.driver->name,
+ sizeof(gd.driver));
+ ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
+ }
+ return ret;
+}
+
+static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_connectinfo ci = {
+ .devnum = ps->dev->devnum,
+ .slow = ps->dev->speed == USB_SPEED_LOW
+ };
+
+ if (copy_to_user(arg, &ci, sizeof(ci)))
+ return -EFAULT;
+ return 0;
+}
+
+static int proc_resetdevice(struct usb_dev_state *ps)
+{
+ return usb_reset_device(ps->dev);
+}
+
+static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_setinterface setintf;
+ int ret;
+
+ if (copy_from_user(&setintf, arg, sizeof(setintf)))
+ return -EFAULT;
+ if ((ret = checkintf(ps, setintf.interface)))
+ return ret;
+
+ destroy_async_on_interface(ps, setintf.interface);
+
+ return usb_set_interface(ps->dev, setintf.interface,
+ setintf.altsetting);
+}
+
+static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
+{
+ int u;
+ int status = 0;
+ struct usb_host_config *actconfig;
+
+ if (get_user(u, (int __user *)arg))
+ return -EFAULT;
+
+ actconfig = ps->dev->actconfig;
+
+ /* Don't touch the device if any interfaces are claimed.
+ * It could interfere with other drivers' operations, and if
+ * an interface is claimed by usbfs it could easily deadlock.
+ */
+ if (actconfig) {
+ int i;
+
+ for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
+ if (usb_interface_claimed(actconfig->interface[i])) {
+ dev_warn(&ps->dev->dev,
+ "usbfs: interface %d claimed by %s "
+ "while '%s' sets config #%d\n",
+ actconfig->interface[i]
+ ->cur_altsetting
+ ->desc.bInterfaceNumber,
+ actconfig->interface[i]
+ ->dev.driver->name,
+ current->comm, u);
+ status = -EBUSY;
+ break;
+ }
+ }
+ }
+
+ /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
+ * so avoid usb_set_configuration()'s kick to sysfs
+ */
+ if (status == 0) {
+ if (actconfig && actconfig->desc.bConfigurationValue == u)
+ status = usb_reset_configuration(ps->dev);
+ else
+ status = usb_set_configuration(ps->dev, u);
+ }
+
+ return status;
+}
+
+static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
+ struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
+ void __user *arg)
+{
+ struct usbdevfs_iso_packet_desc *isopkt = NULL;
+ struct usb_host_endpoint *ep;
+ struct async *as = NULL;
+ struct usb_ctrlrequest *dr = NULL;
+ unsigned int u, totlen, isofrmlen;
+ int i, ret, is_in, num_sgs = 0, ifnum = -1;
+ int number_of_packets = 0;
+ unsigned int stream_id = 0;
+ void *buf;
+
+ if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
+ USBDEVFS_URB_SHORT_NOT_OK |
+ USBDEVFS_URB_BULK_CONTINUATION |
+ USBDEVFS_URB_NO_FSBR |
+ USBDEVFS_URB_ZERO_PACKET |
+ USBDEVFS_URB_NO_INTERRUPT))
+ return -EINVAL;
+ if (uurb->buffer_length > 0 && !uurb->buffer)
+ return -EINVAL;
+ if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
+ (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
+ ifnum = findintfep(ps->dev, uurb->endpoint);
+ if (ifnum < 0)
+ return ifnum;
+ ret = checkintf(ps, ifnum);
+ if (ret)
+ return ret;
+ }
+ ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
+ if (!ep)
+ return -ENOENT;
+ is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
+
+ u = 0;
+ switch(uurb->type) {
+ case USBDEVFS_URB_TYPE_CONTROL:
+ if (!usb_endpoint_xfer_control(&ep->desc))
+ return -EINVAL;
+ /* min 8 byte setup packet */
+ if (uurb->buffer_length < 8)
+ return -EINVAL;
+ dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+ if (copy_from_user(dr, uurb->buffer, 8)) {
+ ret = -EFAULT;
+ goto error;
+ }
+ if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
+ ret = -EINVAL;
+ goto error;
+ }
+ ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
+ le16_to_cpup(&dr->wIndex));
+ if (ret)
+ goto error;
+ uurb->buffer_length = le16_to_cpup(&dr->wLength);
+ uurb->buffer += 8;
+ if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
+ is_in = 1;
+ uurb->endpoint |= USB_DIR_IN;
+ } else {
+ is_in = 0;
+ uurb->endpoint &= ~USB_DIR_IN;
+ }
+ snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
+ "bRequest=%02x wValue=%04x "
+ "wIndex=%04x wLength=%04x\n",
+ dr->bRequestType, dr->bRequest,
+ __le16_to_cpup(&dr->wValue),
+ __le16_to_cpup(&dr->wIndex),
+ __le16_to_cpup(&dr->wLength));
+ u = sizeof(struct usb_ctrlrequest);
+ break;
+
+ case USBDEVFS_URB_TYPE_BULK:
+ switch (usb_endpoint_type(&ep->desc)) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ case USB_ENDPOINT_XFER_ISOC:
+ return -EINVAL;
+ case USB_ENDPOINT_XFER_INT:
+ /* allow single-shot interrupt transfers */
+ uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
+ goto interrupt_urb;
+ }
+ num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
+ if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
+ num_sgs = 0;
+ if (ep->streams)
+ stream_id = uurb->stream_id;
+ break;
+
+ case USBDEVFS_URB_TYPE_INTERRUPT:
+ if (!usb_endpoint_xfer_int(&ep->desc))
+ return -EINVAL;
+ interrupt_urb:
+ break;
+
+ case USBDEVFS_URB_TYPE_ISO:
+ /* arbitrary limit */
+ if (uurb->number_of_packets < 1 ||
+ uurb->number_of_packets > 128)
+ return -EINVAL;
+ if (!usb_endpoint_xfer_isoc(&ep->desc))
+ return -EINVAL;
+ number_of_packets = uurb->number_of_packets;
+ isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
+ number_of_packets;
+ if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
+ return -ENOMEM;
+ if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
+ ret = -EFAULT;
+ goto error;
+ }
+ for (totlen = u = 0; u < number_of_packets; u++) {
+ /*
+ * arbitrary limit need for USB 3.0
+ * bMaxBurst (0~15 allowed, 1~16 packets)
+ * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
+ * sizemax: 1024 * 16 * 3 = 49152
+ */
+ if (isopkt[u].length > 49152) {
+ ret = -EINVAL;
+ goto error;
+ }
+ totlen += isopkt[u].length;
+ }
+ u *= sizeof(struct usb_iso_packet_descriptor);
+ uurb->buffer_length = totlen;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (uurb->buffer_length >= USBFS_XFER_MAX) {
+ ret = -EINVAL;
+ goto error;
+ }
+ if (uurb->buffer_length > 0 &&
+ !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
+ uurb->buffer, uurb->buffer_length)) {
+ ret = -EFAULT;
+ goto error;
+ }
+ as = alloc_async(number_of_packets);
+ if (!as) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
+ num_sgs * sizeof(struct scatterlist);
+ ret = usbfs_increase_memory_usage(u);
+ if (ret)
+ goto error;
+ as->mem_usage = u;
+
+ if (num_sgs) {
+ as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
+ GFP_KERNEL);
+ if (!as->urb->sg) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ as->urb->num_sgs = num_sgs;
+ sg_init_table(as->urb->sg, as->urb->num_sgs);
+
+ totlen = uurb->buffer_length;
+ for (i = 0; i < as->urb->num_sgs; i++) {
+ u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
+ buf = kmalloc(u, GFP_KERNEL);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ sg_set_buf(&as->urb->sg[i], buf, u);
+
+ if (!is_in) {
+ if (copy_from_user(buf, uurb->buffer, u)) {
+ ret = -EFAULT;
+ goto error;
+ }
+ uurb->buffer += u;
+ }
+ totlen -= u;
+ }
+ } else if (uurb->buffer_length > 0) {
+ as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
+ GFP_KERNEL);
+ if (!as->urb->transfer_buffer) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if (!is_in) {
+ if (copy_from_user(as->urb->transfer_buffer,
+ uurb->buffer,
+ uurb->buffer_length)) {
+ ret = -EFAULT;
+ goto error;
+ }
+ } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
+ /*
+ * Isochronous input data may end up being
+ * discontiguous if some of the packets are short.
+ * Clear the buffer so that the gaps don't leak
+ * kernel data to userspace.
+ */
+ memset(as->urb->transfer_buffer, 0,
+ uurb->buffer_length);
+ }
+ }
+ as->urb->dev = ps->dev;
+ as->urb->pipe = (uurb->type << 30) |
+ __create_pipe(ps->dev, uurb->endpoint & 0xf) |
+ (uurb->endpoint & USB_DIR_IN);
+
+ /* This tedious sequence is necessary because the URB_* flags
+ * are internal to the kernel and subject to change, whereas
+ * the USBDEVFS_URB_* flags are a user API and must not be changed.
+ */
+ u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
+ if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
+ u |= URB_ISO_ASAP;
+ if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
+ u |= URB_SHORT_NOT_OK;
+ if (uurb->flags & USBDEVFS_URB_NO_FSBR)
+ u |= URB_NO_FSBR;
+ if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
+ u |= URB_ZERO_PACKET;
+ if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
+ u |= URB_NO_INTERRUPT;
+ as->urb->transfer_flags = u;
+
+ as->urb->transfer_buffer_length = uurb->buffer_length;
+ as->urb->setup_packet = (unsigned char *)dr;
+ dr = NULL;
+ as->urb->start_frame = uurb->start_frame;
+ as->urb->number_of_packets = number_of_packets;
+ as->urb->stream_id = stream_id;
+ if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
+ ps->dev->speed == USB_SPEED_HIGH)
+ as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
+ else
+ as->urb->interval = ep->desc.bInterval;
+ as->urb->context = as;
+ as->urb->complete = async_completed;
+ for (totlen = u = 0; u < number_of_packets; u++) {
+ as->urb->iso_frame_desc[u].offset = totlen;
+ as->urb->iso_frame_desc[u].length = isopkt[u].length;
+ totlen += isopkt[u].length;
+ }
+ kfree(isopkt);
+ isopkt = NULL;
+ as->ps = ps;
+ as->userurb = arg;
+ if (is_in && uurb->buffer_length > 0)
+ as->userbuffer = uurb->buffer;
+ else
+ as->userbuffer = NULL;
+ as->signr = uurb->signr;
+ as->ifnum = ifnum;
+ as->pid = get_pid(task_pid(current));
+ as->cred = get_current_cred();
+ security_task_getsecid(current, &as->secid);
+ snoop_urb(ps->dev, as->userurb, as->urb->pipe,
+ as->urb->transfer_buffer_length, 0, SUBMIT,
+ NULL, 0);
+ if (!is_in)
+ snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
+
+ async_newpending(as);
+
+ if (usb_endpoint_xfer_bulk(&ep->desc)) {
+ spin_lock_irq(&ps->lock);
+
+ /* Not exactly the endpoint address; the direction bit is
+ * shifted to the 0x10 position so that the value will be
+ * between 0 and 31.
+ */
+ as->bulk_addr = usb_endpoint_num(&ep->desc) |
+ ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+ >> 3);
+
+ /* If this bulk URB is the start of a new transfer, re-enable
+ * the endpoint. Otherwise mark it as a continuation URB.
+ */
+ if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
+ as->bulk_status = AS_CONTINUATION;
+ else
+ ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
+
+ /* Don't accept continuation URBs if the endpoint is
+ * disabled because of an earlier error.
+ */
+ if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
+ ret = -EREMOTEIO;
+ else
+ ret = usb_submit_urb(as->urb, GFP_ATOMIC);
+ spin_unlock_irq(&ps->lock);
+ } else {
+ ret = usb_submit_urb(as->urb, GFP_KERNEL);
+ }
+
+ if (ret) {
+ dev_printk(KERN_DEBUG, &ps->dev->dev,
+ "usbfs: usb_submit_urb returned %d\n", ret);
+ snoop_urb(ps->dev, as->userurb, as->urb->pipe,
+ 0, ret, COMPLETE, NULL, 0);
+ async_removepending(as);
+ goto error;
+ }
+ return 0;
+
+ error:
+ kfree(isopkt);
+ kfree(dr);
+ if (as)
+ free_async(as);
+ return ret;
+}
+
+static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_urb uurb;
+
+ if (copy_from_user(&uurb, arg, sizeof(uurb)))
+ return -EFAULT;
+
+ return proc_do_submiturb(ps, &uurb,
+ (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
+ arg);
+}
+
+static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
+{
+ struct urb *urb;
+ struct async *as;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ps->lock, flags);
+ as = async_getpending(ps, arg);
+ if (!as) {
+ spin_unlock_irqrestore(&ps->lock, flags);
+ return -EINVAL;
+ }
+
+ urb = as->urb;
+ usb_get_urb(urb);
+ spin_unlock_irqrestore(&ps->lock, flags);
+
+ usb_kill_urb(urb);
+ usb_put_urb(urb);
+
+ return 0;
+}
+
+static int processcompl(struct async *as, void __user * __user *arg)
+{
+ struct urb *urb = as->urb;
+ struct usbdevfs_urb __user *userurb = as->userurb;
+ void __user *addr = as->userurb;
+ unsigned int i;
+
+ if (as->userbuffer && urb->actual_length) {
+ if (copy_urb_data_to_user(as->userbuffer, urb))
+ goto err_out;
+ }
+ if (put_user(as->status, &userurb->status))
+ goto err_out;
+ if (put_user(urb->actual_length, &userurb->actual_length))
+ goto err_out;
+ if (put_user(urb->error_count, &userurb->error_count))
+ goto err_out;
+
+ if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+ for (i = 0; i < urb->number_of_packets; i++) {
+ if (put_user(urb->iso_frame_desc[i].actual_length,
+ &userurb->iso_frame_desc[i].actual_length))
+ goto err_out;
+ if (put_user(urb->iso_frame_desc[i].status,
+ &userurb->iso_frame_desc[i].status))
+ goto err_out;
+ }
+ }
+
+ if (put_user(addr, (void __user * __user *)arg))
+ return -EFAULT;
+ return 0;
+
+err_out:
+ return -EFAULT;
+}
+
+static struct async *reap_as(struct usb_dev_state *ps)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct async *as = NULL;
+ struct usb_device *dev = ps->dev;
+
+ add_wait_queue(&ps->wait, &wait);
+ for (;;) {
+ __set_current_state(TASK_INTERRUPTIBLE);
+ as = async_getcompleted(ps);
+ if (as || !connected(ps))
+ break;
+ if (signal_pending(current))
+ break;
+ usb_unlock_device(dev);
+ schedule();
+ usb_lock_device(dev);
+ }
+ remove_wait_queue(&ps->wait, &wait);
+ set_current_state(TASK_RUNNING);
+ return as;
+}
+
+static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
+{
+ struct async *as = reap_as(ps);
+ if (as) {
+ int retval = processcompl(as, (void __user * __user *)arg);
+ free_async(as);
+ return retval;
+ }
+ if (signal_pending(current))
+ return -EINTR;
+ return -ENODEV;
+}
+
+static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
+{
+ int retval;
+ struct async *as;
+
+ as = async_getcompleted(ps);
+ if (as) {
+ retval = processcompl(as, (void __user * __user *)arg);
+ free_async(as);
+ } else {
+ retval = (connected(ps) ? -EAGAIN : -ENODEV);
+ }
+ return retval;
+}
+
+#ifdef CONFIG_COMPAT
+static int proc_control_compat(struct usb_dev_state *ps,
+ struct usbdevfs_ctrltransfer32 __user *p32)
+{
+ struct usbdevfs_ctrltransfer __user *p;
+ __u32 udata;
+ p = compat_alloc_user_space(sizeof(*p));
+ if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
+ get_user(udata, &p32->data) ||
+ put_user(compat_ptr(udata), &p->data))
+ return -EFAULT;
+ return proc_control(ps, p);
+}
+
+static int proc_bulk_compat(struct usb_dev_state *ps,
+ struct usbdevfs_bulktransfer32 __user *p32)
+{
+ struct usbdevfs_bulktransfer __user *p;
+ compat_uint_t n;
+ compat_caddr_t addr;
+
+ p = compat_alloc_user_space(sizeof(*p));
+
+ if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
+ get_user(n, &p32->len) || put_user(n, &p->len) ||
+ get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
+ get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
+ return -EFAULT;
+
+ return proc_bulk(ps, p);
+}
+static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_disconnectsignal32 ds;
+
+ if (copy_from_user(&ds, arg, sizeof(ds)))
+ return -EFAULT;
+ ps->discsignr = ds.signr;
+ ps->disccontext = compat_ptr(ds.context);
+ return 0;
+}
+
+static int get_urb32(struct usbdevfs_urb *kurb,
+ struct usbdevfs_urb32 __user *uurb)
+{
+ __u32 uptr;
+ if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
+ __get_user(kurb->type, &uurb->type) ||
+ __get_user(kurb->endpoint, &uurb->endpoint) ||
+ __get_user(kurb->status, &uurb->status) ||
+ __get_user(kurb->flags, &uurb->flags) ||
+ __get_user(kurb->buffer_length, &uurb->buffer_length) ||
+ __get_user(kurb->actual_length, &uurb->actual_length) ||
+ __get_user(kurb->start_frame, &uurb->start_frame) ||
+ __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
+ __get_user(kurb->error_count, &uurb->error_count) ||
+ __get_user(kurb->signr, &uurb->signr))
+ return -EFAULT;
+
+ if (__get_user(uptr, &uurb->buffer))
+ return -EFAULT;
+ kurb->buffer = compat_ptr(uptr);
+ if (__get_user(uptr, &uurb->usercontext))
+ return -EFAULT;
+ kurb->usercontext = compat_ptr(uptr);
+
+ return 0;
+}
+
+static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_urb uurb;
+
+ if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
+ return -EFAULT;
+
+ return proc_do_submiturb(ps, &uurb,
+ ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
+ arg);
+}
+
+static int processcompl_compat(struct async *as, void __user * __user *arg)
+{
+ struct urb *urb = as->urb;
+ struct usbdevfs_urb32 __user *userurb = as->userurb;
+ void __user *addr = as->userurb;
+ unsigned int i;
+
+ if (as->userbuffer && urb->actual_length) {
+ if (copy_urb_data_to_user(as->userbuffer, urb))
+ return -EFAULT;
+ }
+ if (put_user(as->status, &userurb->status))
+ return -EFAULT;
+ if (put_user(urb->actual_length, &userurb->actual_length))
+ return -EFAULT;
+ if (put_user(urb->error_count, &userurb->error_count))
+ return -EFAULT;
+
+ if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+ for (i = 0; i < urb->number_of_packets; i++) {
+ if (put_user(urb->iso_frame_desc[i].actual_length,
+ &userurb->iso_frame_desc[i].actual_length))
+ return -EFAULT;
+ if (put_user(urb->iso_frame_desc[i].status,
+ &userurb->iso_frame_desc[i].status))
+ return -EFAULT;
+ }
+ }
+
+ if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
+ return -EFAULT;
+ return 0;
+}
+
+static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
+{
+ struct async *as = reap_as(ps);
+ if (as) {
+ int retval = processcompl_compat(as, (void __user * __user *)arg);
+ free_async(as);
+ return retval;
+ }
+ if (signal_pending(current))
+ return -EINTR;
+ return -ENODEV;
+}
+
+static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
+{
+ int retval;
+ struct async *as;
+
+ as = async_getcompleted(ps);
+ if (as) {
+ retval = processcompl_compat(as, (void __user * __user *)arg);
+ free_async(as);
+ } else {
+ retval = (connected(ps) ? -EAGAIN : -ENODEV);
+ }
+ return retval;
+}
+
+
+#endif
+
+static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_disconnectsignal ds;
+
+ if (copy_from_user(&ds, arg, sizeof(ds)))
+ return -EFAULT;
+ ps->discsignr = ds.signr;
+ ps->disccontext = ds.context;
+ return 0;
+}
+
+static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned int ifnum;
+
+ if (get_user(ifnum, (unsigned int __user *)arg))
+ return -EFAULT;
+ return claimintf(ps, ifnum);
+}
+
+static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned int ifnum;
+ int ret;
+
+ if (get_user(ifnum, (unsigned int __user *)arg))
+ return -EFAULT;
+ if ((ret = releaseintf(ps, ifnum)) < 0)
+ return ret;
+ destroy_async_on_interface (ps, ifnum);
+ return 0;
+}
+
+static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
+{
+ int size;
+ void *buf = NULL;
+ int retval = 0;
+ struct usb_interface *intf = NULL;
+ struct usb_driver *driver = NULL;
+
+ /* alloc buffer */
+ if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
+ buf = kmalloc(size, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+ if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
+ if (copy_from_user(buf, ctl->data, size)) {
+ kfree(buf);
+ return -EFAULT;
+ }
+ } else {
+ memset(buf, 0, size);
+ }
+ }
+
+ if (!connected(ps)) {
+ kfree(buf);
+ return -ENODEV;
+ }
+
+ if (ps->dev->state != USB_STATE_CONFIGURED)
+ retval = -EHOSTUNREACH;
+ else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
+ retval = -EINVAL;
+ else switch (ctl->ioctl_code) {
+
+ /* disconnect kernel driver from interface */
+ case USBDEVFS_DISCONNECT:
+ if (intf->dev.driver) {
+ driver = to_usb_driver(intf->dev.driver);
+ dev_dbg(&intf->dev, "disconnect by usbfs\n");
+ usb_driver_release_interface(driver, intf);
+ } else
+ retval = -ENODATA;
+ break;
+
+ /* let kernel drivers try to (re)bind to the interface */
+ case USBDEVFS_CONNECT:
+ if (!intf->dev.driver)
+ retval = device_attach(&intf->dev);
+ else
+ retval = -EBUSY;
+ break;
+
+ /* talk directly to the interface's driver */
+ default:
+ if (intf->dev.driver)
+ driver = to_usb_driver(intf->dev.driver);
+ if (driver == NULL || driver->unlocked_ioctl == NULL) {
+ retval = -ENOTTY;
+ } else {
+ retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
+ if (retval == -ENOIOCTLCMD)
+ retval = -ENOTTY;
+ }
+ }
+
+ /* cleanup and return */
+ if (retval >= 0
+ && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
+ && size > 0
+ && copy_to_user(ctl->data, buf, size) != 0)
+ retval = -EFAULT;
+
+ kfree(buf);
+ return retval;
+}
+
+static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_ioctl ctrl;
+
+ if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+ return -EFAULT;
+ return proc_ioctl(ps, &ctrl);
+}
+
+#ifdef CONFIG_COMPAT
+static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
+{
+ struct usbdevfs_ioctl32 __user *uioc;
+ struct usbdevfs_ioctl ctrl;
+ u32 udata;
+
+ uioc = compat_ptr((long)arg);
+ if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
+ __get_user(ctrl.ifno, &uioc->ifno) ||
+ __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
+ __get_user(udata, &uioc->data))
+ return -EFAULT;
+ ctrl.data = compat_ptr(udata);
+
+ return proc_ioctl(ps, &ctrl);
+}
+#endif
+
+static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned portnum;
+ int rc;
+
+ if (get_user(portnum, (unsigned __user *) arg))
+ return -EFAULT;
+ rc = usb_hub_claim_port(ps->dev, portnum, ps);
+ if (rc == 0)
+ snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
+ portnum, task_pid_nr(current), current->comm);
+ return rc;
+}
+
+static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned portnum;
+
+ if (get_user(portnum, (unsigned __user *) arg))
+ return -EFAULT;
+ return usb_hub_release_port(ps->dev, portnum, ps);
+}
+
+static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
+{
+ __u32 caps;
+
+ caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
+ USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
+ if (!ps->dev->bus->no_stop_on_short)
+ caps |= USBDEVFS_CAP_BULK_CONTINUATION;
+ if (ps->dev->bus->sg_tablesize)
+ caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
+
+ if (put_user(caps, (__u32 __user *)arg))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_disconnect_claim dc;
+ struct usb_interface *intf;
+
+ if (copy_from_user(&dc, arg, sizeof(dc)))
+ return -EFAULT;
+
+ intf = usb_ifnum_to_if(ps->dev, dc.interface);
+ if (!intf)
+ return -EINVAL;
+
+ if (intf->dev.driver) {
+ struct usb_driver *driver = to_usb_driver(intf->dev.driver);
+
+ if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
+ strncmp(dc.driver, intf->dev.driver->name,
+ sizeof(dc.driver)) != 0)
+ return -EBUSY;
+
+ if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
+ strncmp(dc.driver, intf->dev.driver->name,
+ sizeof(dc.driver)) == 0)
+ return -EBUSY;
+
+ dev_dbg(&intf->dev, "disconnect by usbfs\n");
+ usb_driver_release_interface(driver, intf);
+ }
+
+ return claimintf(ps, dc.interface);
+}
+
+static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned num_streams, num_eps;
+ struct usb_host_endpoint **eps;
+ struct usb_interface *intf;
+ int r;
+
+ r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
+ &eps, &intf);
+ if (r)
+ return r;
+
+ destroy_async_on_interface(ps,
+ intf->altsetting[0].desc.bInterfaceNumber);
+
+ r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
+ kfree(eps);
+ return r;
+}
+
+static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
+{
+ unsigned num_eps;
+ struct usb_host_endpoint **eps;
+ struct usb_interface *intf;
+ int r;
+
+ r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
+ if (r)
+ return r;
+
+ destroy_async_on_interface(ps,
+ intf->altsetting[0].desc.bInterfaceNumber);
+
+ r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
+ kfree(eps);
+ return r;
+}
+
+/*
+ * NOTE: All requests here that have interface numbers as parameters
+ * are assuming that somehow the configuration has been prevented from
+ * changing. But there's no mechanism to ensure that...
+ */
+static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
+ void __user *p)
+{
+ struct usb_dev_state *ps = file->private_data;
+ struct inode *inode = file_inode(file);
+ struct usb_device *dev = ps->dev;
+ int ret = -ENOTTY;
+
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EPERM;
+
+ usb_lock_device(dev);
+
+ /* Reap operations are allowed even after disconnection */
+ switch (cmd) {
+ case USBDEVFS_REAPURB:
+ snoop(&dev->dev, "%s: REAPURB\n", __func__);
+ ret = proc_reapurb(ps, p);
+ goto done;
+
+ case USBDEVFS_REAPURBNDELAY:
+ snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
+ ret = proc_reapurbnonblock(ps, p);
+ goto done;
+
+#ifdef CONFIG_COMPAT
+ case USBDEVFS_REAPURB32:
+ snoop(&dev->dev, "%s: REAPURB32\n", __func__);
+ ret = proc_reapurb_compat(ps, p);
+ goto done;
+
+ case USBDEVFS_REAPURBNDELAY32:
+ snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
+ ret = proc_reapurbnonblock_compat(ps, p);
+ goto done;
+#endif
+ }
+
+ if (!connected(ps)) {
+ usb_unlock_device(dev);
+ return -ENODEV;
+ }
+
+ switch (cmd) {
+ case USBDEVFS_CONTROL:
+ snoop(&dev->dev, "%s: CONTROL\n", __func__);
+ ret = proc_control(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_BULK:
+ snoop(&dev->dev, "%s: BULK\n", __func__);
+ ret = proc_bulk(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_RESETEP:
+ snoop(&dev->dev, "%s: RESETEP\n", __func__);
+ ret = proc_resetep(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_RESET:
+ snoop(&dev->dev, "%s: RESET\n", __func__);
+ ret = proc_resetdevice(ps);
+ break;
+
+ case USBDEVFS_CLEAR_HALT:
+ snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
+ ret = proc_clearhalt(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_GETDRIVER:
+ snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
+ ret = proc_getdriver(ps, p);
+ break;
+
+ case USBDEVFS_CONNECTINFO:
+ snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
+ ret = proc_connectinfo(ps, p);
+ break;
+
+ case USBDEVFS_SETINTERFACE:
+ snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
+ ret = proc_setintf(ps, p);
+ break;
+
+ case USBDEVFS_SETCONFIGURATION:
+ snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
+ ret = proc_setconfig(ps, p);
+ break;
+
+ case USBDEVFS_SUBMITURB:
+ snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
+ ret = proc_submiturb(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+#ifdef CONFIG_COMPAT
+ case USBDEVFS_CONTROL32:
+ snoop(&dev->dev, "%s: CONTROL32\n", __func__);
+ ret = proc_control_compat(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_BULK32:
+ snoop(&dev->dev, "%s: BULK32\n", __func__);
+ ret = proc_bulk_compat(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_DISCSIGNAL32:
+ snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
+ ret = proc_disconnectsignal_compat(ps, p);
+ break;
+
+ case USBDEVFS_SUBMITURB32:
+ snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
+ ret = proc_submiturb_compat(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_IOCTL32:
+ snoop(&dev->dev, "%s: IOCTL32\n", __func__);
+ ret = proc_ioctl_compat(ps, ptr_to_compat(p));
+ break;
+#endif
+
+ case USBDEVFS_DISCARDURB:
+ snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
+ ret = proc_unlinkurb(ps, p);
+ break;
+
+ case USBDEVFS_DISCSIGNAL:
+ snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
+ ret = proc_disconnectsignal(ps, p);
+ break;
+
+ case USBDEVFS_CLAIMINTERFACE:
+ snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
+ ret = proc_claiminterface(ps, p);
+ break;
+
+ case USBDEVFS_RELEASEINTERFACE:
+ snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
+ ret = proc_releaseinterface(ps, p);
+ break;
+
+ case USBDEVFS_IOCTL:
+ snoop(&dev->dev, "%s: IOCTL\n", __func__);
+ ret = proc_ioctl_default(ps, p);
+ break;
+
+ case USBDEVFS_CLAIM_PORT:
+ snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
+ ret = proc_claim_port(ps, p);
+ break;
+
+ case USBDEVFS_RELEASE_PORT:
+ snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
+ ret = proc_release_port(ps, p);
+ break;
+ case USBDEVFS_GET_CAPABILITIES:
+ ret = proc_get_capabilities(ps, p);
+ break;
+ case USBDEVFS_DISCONNECT_CLAIM:
+ ret = proc_disconnect_claim(ps, p);
+ break;
+ case USBDEVFS_ALLOC_STREAMS:
+ ret = proc_alloc_streams(ps, p);
+ break;
+ case USBDEVFS_FREE_STREAMS:
+ ret = proc_free_streams(ps, p);
+ break;
+ }
+
+ done:
+ usb_unlock_device(dev);
+ if (ret >= 0)
+ inode->i_atime = CURRENT_TIME;
+ return ret;
+}
+
+static long usbdev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret;
+
+ ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret;
+
+ ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
+
+ return ret;
+}
+#endif
+
+/* No kernel lock - fine */
+static unsigned int usbdev_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ struct usb_dev_state *ps = file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait(file, &ps->wait, wait);
+ if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
+ mask |= POLLOUT | POLLWRNORM;
+ if (!connected(ps))
+ mask |= POLLERR | POLLHUP;
+ return mask;
+}
+
+const struct file_operations usbdev_file_operations = {
+ .owner = THIS_MODULE,
+ .llseek = usbdev_lseek,
+ .read = usbdev_read,
+ .poll = usbdev_poll,
+ .unlocked_ioctl = usbdev_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = usbdev_compat_ioctl,
+#endif
+ .open = usbdev_open,
+ .release = usbdev_release,
+};
+
+static void usbdev_remove(struct usb_device *udev)
+{
+ struct usb_dev_state *ps;
+ struct siginfo sinfo;
+
+ while (!list_empty(&udev->filelist)) {
+ ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
+ destroy_all_async(ps);
+ wake_up_all(&ps->wait);
+ list_del_init(&ps->list);
+ if (ps->discsignr) {
+ memset(&sinfo, 0, sizeof(sinfo));
+ sinfo.si_signo = ps->discsignr;
+ sinfo.si_errno = EPIPE;
+ sinfo.si_code = SI_ASYNCIO;
+ sinfo.si_addr = ps->disccontext;
+ kill_pid_info_as_cred(ps->discsignr, &sinfo,
+ ps->disc_pid, ps->cred, ps->secid);
+ }
+ }
+}
+
+static int usbdev_notify(struct notifier_block *self,
+ unsigned long action, void *dev)
+{
+ switch (action) {
+ case USB_DEVICE_ADD:
+ break;
+ case USB_DEVICE_REMOVE:
+ usbdev_remove(dev);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block usbdev_nb = {
+ .notifier_call = usbdev_notify,
+};
+
+static struct cdev usb_device_cdev;
+
+int __init usb_devio_init(void)
+{
+ int retval;
+
+ retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
+ "usb_device");
+ if (retval) {
+ printk(KERN_ERR "Unable to register minors for usb_device\n");
+ goto out;
+ }
+ cdev_init(&usb_device_cdev, &usbdev_file_operations);
+ retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
+ if (retval) {
+ printk(KERN_ERR "Unable to get usb_device major %d\n",
+ USB_DEVICE_MAJOR);
+ goto error_cdev;
+ }
+ usb_register_notify(&usbdev_nb);
+out:
+ return retval;
+
+error_cdev:
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+ goto out;
+}
+
+void usb_devio_cleanup(void)
+{
+ usb_unregister_notify(&usbdev_nb);
+ cdev_del(&usb_device_cdev);
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+}
Code Review / kvmfornfv.git / blobdiff