/* * $Id: stub_rx.c 66 2008-04-20 13:19:42Z hirofuchi $ * * Copyright (C) 2003-2008 Takahiro Hirofuchi * * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */#include "usbip_common.h"#include "stub.h"static int is_clear_halt_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	req = (struct usb_ctrlrequest *) urb->setup_packet;	 return (req->bRequest == USB_REQ_CLEAR_FEATURE) &&		 (req->bRequestType == USB_RECIP_ENDPOINT) &&		 (req->wValue == USB_ENDPOINT_HALT);}static int is_set_interface_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	req = (struct usb_ctrlrequest *) urb->setup_packet;	return (req->bRequest == USB_REQ_SET_INTERFACE) &&		   (req->bRequestType == USB_RECIP_INTERFACE);}static int is_set_configuration_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	req = (struct usb_ctrlrequest *) urb->setup_packet;	return (req->bRequest == USB_REQ_SET_CONFIGURATION) &&		   (req->bRequestType == USB_RECIP_DEVICE);}#if 0static int is_reset_device_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	__u16 value;	__u16 index;	req = (struct usb_ctrlrequest *) urb->setup_packet;	value = le16_to_cpu(req->wValue);	index = le16_to_cpu(req->wIndex);	if ((req->bRequest == USB_REQ_SET_FEATURE) &&	    	(req->bRequestType == USB_RT_PORT) &&		(value = USB_PORT_FEAT_RESET)) {		dbg_stub_rx("reset_device_cmd, port %u\n", index);		return 1;	} else 		return 0;}#endifstatic int tweak_clear_halt_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	int target_endp;	int target_dir;	int target_pipe;	int ret;	req = (struct usb_ctrlrequest *) urb->setup_packet;	/*	 * The stalled endpoint is specified in the wIndex value. The endpoint	 * of the urb is the target of this clear_halt request (i.e., control	 * endpoint).	 */	target_endp = le16_to_cpu(req->wIndex) & 0x000f;	/* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80. */	target_dir = le16_to_cpu(req->wIndex) & 0x0080;	if (target_dir)		target_pipe = usb_rcvctrlpipe(urb->dev, target_endp);	else		target_pipe = usb_sndctrlpipe(urb->dev, target_endp);	ret = usb_clear_halt(urb->dev, target_pipe);	if (ret < 0)		uinfo("clear_halt error: devnum %d endp %d, %d\n",				urb->dev->devnum, target_endp, ret);	else		uinfo("clear_halt done: devnum %d endp %d\n",				urb->dev->devnum, target_endp);	return ret;}static int tweak_set_interface_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	__u16 alternate;	__u16 interface;	int ret;	req = (struct usb_ctrlrequest *) urb->setup_packet;	alternate = le16_to_cpu(req->wValue);	interface = le16_to_cpu(req->wIndex);	dbg_stub_rx("set_interface: inf %u alt %u\n", interface, alternate);	ret = usb_set_interface(urb->dev, interface, alternate);	if (ret < 0)		uinfo("set_interface error: inf %u alt %u, %d\n",				interface, alternate, ret);	else		uinfo("set_interface done: inf %u alt %u\n", interface, alternate);	return ret;}static int tweak_set_configuration_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	__u16 config;	req = (struct usb_ctrlrequest *) urb->setup_packet;	config = le16_to_cpu(req->wValue);	/*	 * I have never seen a multi-config device. Very rare.	 * For most devices, this will be called to choose a default	 * configuration only once in an initialization phase.	 *	 * set_configuration may change a device configuration and its device	 * drivers will be unbound and assigned for a new device configuration.	 * This means this usbip driver will be also unbound when called, then	 * eventually reassigned to the device as far as driver matching	 * condition is kept.	 *	 * Unfortunatelly, an existing usbip connection will be dropped	 * due to this driver unbinding. So, skip here.	 * A user may need to set a special configuration value before	 * exporting the device.	 */	uinfo("set_configuration (%d) to %s\n", config, urb->dev->dev.bus_id);	uinfo("but, skip!\n");#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)	return 0;	//return usb_driver_set_configuration(urb->dev, config);#else	//uinfo("no support of set_config in 2.6.18\n");	return 0;#endif}#if 0static int tweak_reset_device_cmd(struct urb *urb){	struct usb_ctrlrequest *req;	__u16 value;	__u16 index;	int ret;	req = (struct usb_ctrlrequest *) urb->setup_packet;	value = le16_to_cpu(req->wValue);	index = le16_to_cpu(req->wIndex);	uinfo("reset_device (port %d) to %s\n", index, urb->dev->dev.bus_id);	/* all interfaces should be owned by usbip driver, so just reset it. */	ret = usb_lock_device_for_reset(urb->dev, NULL);	if (ret < 0) {		uerr("lock for reset\n");		return ret;	}	/* try to reset the device */	ret = usb_reset_composite_device(urb->dev, NULL);	if (ret < 0)		uerr("device reset\n");	usb_unlock_device(urb->dev);	return ret;}#endif/* * clear_halt, set_interface, and set_configuration require special tricks. */static void tweak_special_requests(struct urb *urb){	if (!urb || !urb->setup_packet)		return;	if (usb_pipetype(urb->pipe) != PIPE_CONTROL)		return;	if (is_clear_halt_cmd(urb))		/* tweak clear_halt */		 tweak_clear_halt_cmd(urb);	else if (is_set_interface_cmd(urb))		/* tweak set_interface */		tweak_set_interface_cmd(urb);	else if (is_set_configuration_cmd(urb))		/* tweak set_configuration */		tweak_set_configuration_cmd(urb);#if 0	else if (is_reset_device_cmd(urb))		tweak_reset_device_cmd(urb);#endif	else		dbg_stub_rx("no need to tweak\n");}/* * stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb(). * By unlinking the urb asynchronously, stub_rx can continuously * process coming urbs.  Even if the urb is unlinked, its completion * handler will be called and stub_tx will send a return pdu. * * See also comments about unlinking strategy in vhci_hcd.c. */static int stub_recv_cmd_unlink(struct stub_device *sdev, struct usbip_header *pdu){	struct list_head *listhead = &sdev->priv_init;	struct list_head *ptr;	unsigned long flags;	struct stub_priv *priv;	spin_lock_irqsave(&sdev->priv_lock, flags);	for (ptr = listhead->next; ptr != listhead; ptr = ptr->next) {		priv = list_entry(ptr, struct stub_priv, list);		if (priv->seqnum == pdu->u.cmd_unlink.seqnum) {			int ret;			uinfo("unlink urb %p\n", priv->urb);			/*			 * This matched urb is not completed yet (i.e., be in			 * flight in usb hcd hardware/driver). Now we are			 * cancelling it. The unlinking flag means that we are			 * now not going to return the normal result pdu of a			 * submission request, but going to return a result pdu			 * of the unlink request.			 */			priv->unlinking = 1;			/*			 * In the case that unlinking flag is on, prev->seqnum			 * is changed from the seqnum of the cancelling urb to			 * the seqnum of the unlink request. This will be used			 * to make the result pdu of the unlink request.			 */			priv->seqnum = pdu->base.seqnum;			spin_unlock_irqrestore(&sdev->priv_lock, flags);			/*			 * usb_unlink_urb() is now out of spinlocking to avoid			 * spinlock recursion since stub_complete() is			 * sometimes called in this context but not in the			 * interrupt context.  If stub_complete() is executed			 * before we call usb_unlink_urb(), usb_unlink_urb()			 * will return an error value. In this case, stub_tx			 * will return the result pdu of this unlink request			 * though submission is completed and actual unlinking			 * is not executed. OK?			 */			/* In the above case, urb->status is not -ECONNRESET,			 * so a driver in a client host will know the failure			 * of the unlink request ?			 */			ret = usb_unlink_urb(priv->urb);			if (ret != -EINPROGRESS)				uerr("faild to unlink a urb %p, ret %d\n", priv->urb, ret);			return 0;		}	}	dbg_stub_rx("seqnum %d is not pending\n", pdu->u.cmd_unlink.seqnum);	/*	 * The urb of the unlink target is not found in priv_init queue. It was	 * already completed and its results is/was going to be sent by a	 * CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only	 * return the completeness of this unlink request to vhci_hcd.	 */	stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0);	spin_unlock_irqrestore(&sdev->priv_lock, flags);	return 0;}static int valid_request(struct stub_device *sdev, struct usbip_header *pdu){	struct usbip_device *ud = &sdev->ud;