![Deepa Dinamani](/assets/img/avatar_default.png)
CURRENT_TIME macro is not appropriate for filesystems as it doesn't use the right granularity for filesystem timestamps. Use current_time() instead. CURRENT_TIME is also not y2038 safe. This is also in preparation for the patch that transitions vfs timestamps to use 64 bit time and hence make them y2038 safe. As part of the effort current_time() will be extended to do range checks. Hence, it is necessary for all file system timestamps to use current_time(). Also, current_time() will be transitioned along with vfs to be y2038 safe. Note that whenever a single call to current_time() is used to change timestamps in different inodes, it is because they share the same time granularity. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Felipe Balbi <balbi@kernel.org> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Acked-by: David Sterba <dsterba@suse.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2685 lines
66 KiB
C
2685 lines
66 KiB
C
/*****************************************************************************/
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/*
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* devio.c -- User space communication with USB devices.
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*
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* Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* This file implements the usbfs/x/y files, where
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* x is the bus number and y the device number.
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*
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* It allows user space programs/"drivers" to communicate directly
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* with USB devices without intervening kernel driver.
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*
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* Revision history
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* 22.12.1999 0.1 Initial release (split from proc_usb.c)
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* 04.01.2000 0.2 Turned into its own filesystem
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* 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
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* (CAN-2005-3055)
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*/
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/*****************************************************************************/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/signal.h>
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#include <linux/poll.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/usb.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/usb/hcd.h> /* for usbcore internals */
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#include <linux/cdev.h>
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#include <linux/notifier.h>
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#include <linux/security.h>
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#include <linux/user_namespace.h>
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#include <linux/scatterlist.h>
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#include <linux/uaccess.h>
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#include <linux/dma-mapping.h>
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#include <asm/byteorder.h>
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#include <linux/moduleparam.h>
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#include "usb.h"
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#define USB_MAXBUS 64
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#define USB_DEVICE_MAX (USB_MAXBUS * 128)
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#define USB_SG_SIZE 16384 /* split-size for large txs */
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/* Mutual exclusion for removal, open, and release */
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DEFINE_MUTEX(usbfs_mutex);
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struct usb_dev_state {
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struct list_head list; /* state list */
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struct usb_device *dev;
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struct file *file;
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spinlock_t lock; /* protects the async urb lists */
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struct list_head async_pending;
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struct list_head async_completed;
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struct list_head memory_list;
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wait_queue_head_t wait; /* wake up if a request completed */
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unsigned int discsignr;
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struct pid *disc_pid;
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const struct cred *cred;
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void __user *disccontext;
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unsigned long ifclaimed;
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u32 secid;
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u32 disabled_bulk_eps;
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bool privileges_dropped;
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unsigned long interface_allowed_mask;
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};
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struct usb_memory {
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struct list_head memlist;
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int vma_use_count;
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int urb_use_count;
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u32 size;
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void *mem;
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dma_addr_t dma_handle;
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unsigned long vm_start;
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struct usb_dev_state *ps;
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};
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struct async {
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struct list_head asynclist;
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struct usb_dev_state *ps;
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struct pid *pid;
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const struct cred *cred;
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unsigned int signr;
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unsigned int ifnum;
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void __user *userbuffer;
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void __user *userurb;
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struct urb *urb;
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struct usb_memory *usbm;
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unsigned int mem_usage;
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int status;
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u32 secid;
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u8 bulk_addr;
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u8 bulk_status;
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};
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static bool usbfs_snoop;
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module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
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static unsigned usbfs_snoop_max = 65536;
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module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(usbfs_snoop_max,
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"maximum number of bytes to print while snooping");
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#define snoop(dev, format, arg...) \
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do { \
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if (usbfs_snoop) \
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dev_info(dev, format, ## arg); \
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} while (0)
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enum snoop_when {
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SUBMIT, COMPLETE
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};
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#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
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/* Limit on the total amount of memory we can allocate for transfers */
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static unsigned usbfs_memory_mb = 16;
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module_param(usbfs_memory_mb, uint, 0644);
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MODULE_PARM_DESC(usbfs_memory_mb,
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"maximum MB allowed for usbfs buffers (0 = no limit)");
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/* Hard limit, necessary to avoid arithmetic overflow */
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#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
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static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
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/* Check whether it's okay to allocate more memory for a transfer */
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static int usbfs_increase_memory_usage(unsigned amount)
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{
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unsigned lim;
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/*
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* Convert usbfs_memory_mb to bytes, avoiding overflows.
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* 0 means use the hard limit (effectively unlimited).
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*/
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lim = ACCESS_ONCE(usbfs_memory_mb);
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if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
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lim = USBFS_XFER_MAX;
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else
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lim <<= 20;
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atomic_add(amount, &usbfs_memory_usage);
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if (atomic_read(&usbfs_memory_usage) <= lim)
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return 0;
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atomic_sub(amount, &usbfs_memory_usage);
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return -ENOMEM;
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}
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/* Memory for a transfer is being deallocated */
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static void usbfs_decrease_memory_usage(unsigned amount)
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{
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atomic_sub(amount, &usbfs_memory_usage);
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}
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static int connected(struct usb_dev_state *ps)
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{
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return (!list_empty(&ps->list) &&
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ps->dev->state != USB_STATE_NOTATTACHED);
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}
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static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
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{
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struct usb_dev_state *ps = usbm->ps;
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unsigned long flags;
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spin_lock_irqsave(&ps->lock, flags);
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--*count;
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if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
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list_del(&usbm->memlist);
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spin_unlock_irqrestore(&ps->lock, flags);
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usb_free_coherent(ps->dev, usbm->size, usbm->mem,
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usbm->dma_handle);
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usbfs_decrease_memory_usage(
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usbm->size + sizeof(struct usb_memory));
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kfree(usbm);
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} else {
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spin_unlock_irqrestore(&ps->lock, flags);
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}
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}
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static void usbdev_vm_open(struct vm_area_struct *vma)
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{
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struct usb_memory *usbm = vma->vm_private_data;
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unsigned long flags;
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spin_lock_irqsave(&usbm->ps->lock, flags);
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++usbm->vma_use_count;
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spin_unlock_irqrestore(&usbm->ps->lock, flags);
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}
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static void usbdev_vm_close(struct vm_area_struct *vma)
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{
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struct usb_memory *usbm = vma->vm_private_data;
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dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
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}
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static struct vm_operations_struct usbdev_vm_ops = {
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.open = usbdev_vm_open,
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.close = usbdev_vm_close
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};
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static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct usb_memory *usbm = NULL;
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struct usb_dev_state *ps = file->private_data;
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size_t size = vma->vm_end - vma->vm_start;
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void *mem;
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unsigned long flags;
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dma_addr_t dma_handle;
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int ret;
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ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
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if (ret)
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goto error;
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usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
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if (!usbm) {
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ret = -ENOMEM;
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goto error_decrease_mem;
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}
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mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
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&dma_handle);
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if (!mem) {
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ret = -ENOMEM;
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goto error_free_usbm;
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}
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memset(mem, 0, size);
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usbm->mem = mem;
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usbm->dma_handle = dma_handle;
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usbm->size = size;
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usbm->ps = ps;
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usbm->vm_start = vma->vm_start;
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usbm->vma_use_count = 1;
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INIT_LIST_HEAD(&usbm->memlist);
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if (remap_pfn_range(vma, vma->vm_start,
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virt_to_phys(usbm->mem) >> PAGE_SHIFT,
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size, vma->vm_page_prot) < 0) {
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dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
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return -EAGAIN;
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}
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vma->vm_flags |= VM_IO;
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vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
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vma->vm_ops = &usbdev_vm_ops;
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vma->vm_private_data = usbm;
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spin_lock_irqsave(&ps->lock, flags);
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list_add_tail(&usbm->memlist, &ps->memory_list);
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spin_unlock_irqrestore(&ps->lock, flags);
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return 0;
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error_free_usbm:
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kfree(usbm);
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error_decrease_mem:
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usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
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error:
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return ret;
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}
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static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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struct usb_dev_state *ps = file->private_data;
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struct usb_device *dev = ps->dev;
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ssize_t ret = 0;
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unsigned len;
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loff_t pos;
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int i;
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pos = *ppos;
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usb_lock_device(dev);
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if (!connected(ps)) {
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ret = -ENODEV;
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goto err;
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} else if (pos < 0) {
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ret = -EINVAL;
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goto err;
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}
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if (pos < sizeof(struct usb_device_descriptor)) {
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/* 18 bytes - fits on the stack */
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struct usb_device_descriptor temp_desc;
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memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
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le16_to_cpus(&temp_desc.bcdUSB);
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le16_to_cpus(&temp_desc.idVendor);
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le16_to_cpus(&temp_desc.idProduct);
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le16_to_cpus(&temp_desc.bcdDevice);
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len = sizeof(struct usb_device_descriptor) - pos;
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if (len > nbytes)
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len = nbytes;
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if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
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ret = -EFAULT;
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goto err;
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}
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*ppos += len;
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buf += len;
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nbytes -= len;
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ret += len;
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}
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pos = sizeof(struct usb_device_descriptor);
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for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
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struct usb_config_descriptor *config =
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(struct usb_config_descriptor *)dev->rawdescriptors[i];
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unsigned int length = le16_to_cpu(config->wTotalLength);
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if (*ppos < pos + length) {
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/* The descriptor may claim to be longer than it
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* really is. Here is the actual allocated length. */
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unsigned alloclen =
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le16_to_cpu(dev->config[i].desc.wTotalLength);
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len = length - (*ppos - pos);
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if (len > nbytes)
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len = nbytes;
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/* Simply don't write (skip over) unallocated parts */
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if (alloclen > (*ppos - pos)) {
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alloclen -= (*ppos - pos);
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if (copy_to_user(buf,
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dev->rawdescriptors[i] + (*ppos - pos),
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min(len, alloclen))) {
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ret = -EFAULT;
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goto err;
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}
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}
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*ppos += len;
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buf += len;
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nbytes -= len;
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ret += len;
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}
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pos += length;
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}
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err:
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usb_unlock_device(dev);
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return ret;
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}
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/*
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* async list handling
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*/
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static struct async *alloc_async(unsigned int numisoframes)
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{
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struct async *as;
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as = kzalloc(sizeof(struct async), GFP_KERNEL);
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if (!as)
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return NULL;
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as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
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if (!as->urb) {
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kfree(as);
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return NULL;
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}
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return as;
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}
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static void free_async(struct async *as)
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{
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int i;
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put_pid(as->pid);
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if (as->cred)
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put_cred(as->cred);
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for (i = 0; i < as->urb->num_sgs; i++) {
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if (sg_page(&as->urb->sg[i]))
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kfree(sg_virt(&as->urb->sg[i]));
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}
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kfree(as->urb->sg);
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if (as->usbm == NULL)
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kfree(as->urb->transfer_buffer);
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else
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dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
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kfree(as->urb->setup_packet);
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usb_free_urb(as->urb);
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usbfs_decrease_memory_usage(as->mem_usage);
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kfree(as);
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}
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static void async_newpending(struct async *as)
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{
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struct usb_dev_state *ps = as->ps;
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unsigned long flags;
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spin_lock_irqsave(&ps->lock, flags);
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list_add_tail(&as->asynclist, &ps->async_pending);
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spin_unlock_irqrestore(&ps->lock, flags);
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}
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static void async_removepending(struct async *as)
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{
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struct usb_dev_state *ps = as->ps;
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unsigned long flags;
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spin_lock_irqsave(&ps->lock, flags);
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list_del_init(&as->asynclist);
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spin_unlock_irqrestore(&ps->lock, flags);
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}
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static struct async *async_getcompleted(struct usb_dev_state *ps)
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{
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unsigned long flags;
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struct async *as = NULL;
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spin_lock_irqsave(&ps->lock, flags);
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if (!list_empty(&ps->async_completed)) {
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as = list_entry(ps->async_completed.next, struct async,
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asynclist);
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list_del_init(&as->asynclist);
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}
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spin_unlock_irqrestore(&ps->lock, flags);
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return as;
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}
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|
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static struct async *async_getpending(struct usb_dev_state *ps,
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void __user *userurb)
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{
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struct async *as;
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list_for_each_entry(as, &ps->async_pending, asynclist)
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if (as->userurb == userurb) {
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list_del_init(&as->asynclist);
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return as;
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}
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|
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return NULL;
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}
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|
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static void snoop_urb(struct usb_device *udev,
|
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void __user *userurb, int pipe, unsigned length,
|
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int timeout_or_status, enum snoop_when when,
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unsigned char *data, unsigned data_len)
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{
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static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
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static const char *dirs[] = {"out", "in"};
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int ep;
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const char *t, *d;
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|
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if (!usbfs_snoop)
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return;
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|
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ep = usb_pipeendpoint(pipe);
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t = types[usb_pipetype(pipe)];
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d = dirs[!!usb_pipein(pipe)];
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|
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if (userurb) { /* Async */
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if (when == SUBMIT)
|
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dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
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"length %u\n",
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userurb, ep, t, d, length);
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else
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dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
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"actual_length %u status %d\n",
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userurb, ep, t, d, length,
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timeout_or_status);
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} else {
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if (when == SUBMIT)
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dev_info(&udev->dev, "ep%d %s-%s, length %u, "
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"timeout %d\n",
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ep, t, d, length, timeout_or_status);
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else
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dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
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"status %d\n",
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ep, t, d, length, timeout_or_status);
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}
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|
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data_len = min(data_len, usbfs_snoop_max);
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|
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;
|
|
|
|
len = min(len, usbfs_snoop_max);
|
|
if (!usbfs_snoop || len == 0)
|
|
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) == URB_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;
|
|
|
|
if (ps->privileges_dropped &&
|
|
!test_bit(ifnum, &ps->interface_allowed_mask))
|
|
return -EACCES;
|
|
|
|
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 to_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 = kzalloc(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;
|
|
ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
|
|
spin_lock_init(&ps->lock);
|
|
INIT_LIST_HEAD(&ps->list);
|
|
INIT_LIST_HEAD(&ps->async_pending);
|
|
INIT_LIST_HEAD(&ps->async_completed);
|
|
INIT_LIST_HEAD(&ps->memory_list);
|
|
init_waitqueue_head(&ps->wait);
|
|
ps->disc_pid = get_pid(task_pid(current));
|
|
ps->cred = get_current_cred();
|
|
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;
|
|
tbuf = kmalloc(len1, GFP_KERNEL);
|
|
if (!tbuf) {
|
|
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;
|
|
|
|
memset(&ci, 0, sizeof(ci));
|
|
ci.devnum = ps->dev->devnum;
|
|
ci.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)
|
|
{
|
|
struct usb_host_config *actconfig = ps->dev->actconfig;
|
|
struct usb_interface *interface;
|
|
int i, number;
|
|
|
|
/* Don't allow a device reset if the process has dropped the
|
|
* privilege to do such things and any of the interfaces are
|
|
* currently claimed.
|
|
*/
|
|
if (ps->privileges_dropped && actconfig) {
|
|
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
|
|
interface = actconfig->interface[i];
|
|
number = interface->cur_altsetting->desc.bInterfaceNumber;
|
|
if (usb_interface_claimed(interface) &&
|
|
!test_bit(number, &ps->ifclaimed)) {
|
|
dev_warn(&ps->dev->dev,
|
|
"usbfs: interface %d claimed by %s while '%s' resets device\n",
|
|
number, interface->dev.driver->name, current->comm);
|
|
return -EACCES;
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
ret = checkintf(ps, setintf.interface);
|
|
if (ret)
|
|
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 struct usb_memory *
|
|
find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
|
|
{
|
|
struct usb_memory *usbm = NULL, *iter;
|
|
unsigned long flags;
|
|
unsigned long uurb_start = (unsigned long)uurb->buffer;
|
|
|
|
spin_lock_irqsave(&ps->lock, flags);
|
|
list_for_each_entry(iter, &ps->memory_list, memlist) {
|
|
if (uurb_start >= iter->vm_start &&
|
|
uurb_start < iter->vm_start + iter->size) {
|
|
if (uurb->buffer_length > iter->vm_start + iter->size -
|
|
uurb_start) {
|
|
usbm = ERR_PTR(-EINVAL);
|
|
} else {
|
|
usbm = iter;
|
|
usbm->urb_use_count++;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&ps->lock, flags);
|
|
return usbm;
|
|
}
|
|
|
|
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;
|
|
isopkt = memdup_user(iso_frame_desc, isofrmlen);
|
|
if (IS_ERR(isopkt)) {
|
|
ret = PTR_ERR(isopkt);
|
|
isopkt = NULL;
|
|
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;
|
|
}
|
|
|
|
as->usbm = find_memory_area(ps, uurb);
|
|
if (IS_ERR(as->usbm)) {
|
|
ret = PTR_ERR(as->usbm);
|
|
as->usbm = NULL;
|
|
goto error;
|
|
}
|
|
|
|
/* do not use SG buffers when memory mapped segments
|
|
* are in use
|
|
*/
|
|
if (as->usbm)
|
|
num_sgs = 0;
|
|
|
|
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) {
|
|
if (as->usbm) {
|
|
unsigned long uurb_start = (unsigned long)uurb->buffer;
|
|
|
|
as->urb->transfer_buffer = as->usbm->mem +
|
|
(uurb_start - as->usbm->vm_start);
|
|
} else {
|
|
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 (ep->desc.bInterval) {
|
|
if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
|
|
ps->dev->speed == USB_SPEED_HIGH ||
|
|
ps->dev->speed >= USB_SPEED_SUPER)
|
|
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 (as->usbm) {
|
|
unsigned long uurb_start = (unsigned long)uurb->buffer;
|
|
|
|
as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
as->urb->transfer_dma = as->usbm->dma_handle +
|
|
(uurb_start - as->usbm->vm_start);
|
|
} else if (is_in && uurb->buffer_length > 0)
|
|
as->userbuffer = uurb->buffer;
|
|
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:
|
|
if (as && as->usbm)
|
|
dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
|
|
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;
|
|
|
|
snoop(&ps->dev->dev, "reap %p\n", as->userurb);
|
|
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) {
|
|
snoop(&ps->dev->dev, "reap %p\n", as->userurb);
|
|
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;
|
|
|
|
snoop(&ps->dev->dev, "reap %p\n", as->userurb);
|
|
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) {
|
|
snoop(&ps->dev->dev, "reap %p\n", as->userurb);
|
|
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;
|
|
ret = releaseintf(ps, ifnum);
|
|
if (ret < 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;
|
|
|
|
if (ps->privileges_dropped)
|
|
return -EACCES;
|
|
|
|
/* alloc buffer */
|
|
size = _IOC_SIZE(ctl->ioctl_code);
|
|
if (size > 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 | USBDEVFS_CAP_MMAP |
|
|
USBDEVFS_CAP_DROP_PRIVILEGES;
|
|
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 (ps->privileges_dropped)
|
|
return -EACCES;
|
|
|
|
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;
|
|
}
|
|
|
|
static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
|
|
{
|
|
u32 data;
|
|
|
|
if (copy_from_user(&data, arg, sizeof(data)))
|
|
return -EFAULT;
|
|
|
|
/* This is an one way operation. Once privileges are
|
|
* dropped, you cannot regain them. You may however reissue
|
|
* this ioctl to shrink the allowed interfaces mask.
|
|
*/
|
|
ps->interface_allowed_mask &= data;
|
|
ps->privileges_dropped = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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(inode);
|
|
break;
|
|
|
|
case USBDEVFS_BULK:
|
|
snoop(&dev->dev, "%s: BULK\n", __func__);
|
|
ret = proc_bulk(ps, p);
|
|
if (ret >= 0)
|
|
inode->i_mtime = current_time(inode);
|
|
break;
|
|
|
|
case USBDEVFS_RESETEP:
|
|
snoop(&dev->dev, "%s: RESETEP\n", __func__);
|
|
ret = proc_resetep(ps, p);
|
|
if (ret >= 0)
|
|
inode->i_mtime = current_time(inode);
|
|
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(inode);
|
|
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(inode);
|
|
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(inode);
|
|
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(inode);
|
|
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(inode);
|
|
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 %p\n", __func__, p);
|
|
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;
|
|
case USBDEVFS_DROP_PRIVILEGES:
|
|
ret = proc_drop_privileges(ps, p);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
usb_unlock_device(dev);
|
|
if (ret >= 0)
|
|
inode->i_atime = current_time(inode);
|
|
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 |= POLLHUP;
|
|
if (list_empty(&ps->list))
|
|
mask |= POLLERR;
|
|
return mask;
|
|
}
|
|
|
|
const struct file_operations usbdev_file_operations = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_seek_end_llseek,
|
|
.read = usbdev_read,
|
|
.poll = usbdev_poll,
|
|
.unlocked_ioctl = usbdev_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = usbdev_compat_ioctl,
|
|
#endif
|
|
.mmap = usbdev_mmap,
|
|
.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);
|
|
}
|