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usbip_common.c

/*
 * 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 <linux/kernel.h>
#include <linux/file.h>
#include <linux/tcp.h>
#include <linux/in.h>
#include "usbip_common.h"

/* version information */
#define DRIVER_VERSION "1.0"
#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
#define DRIVER_DESC "usbip common driver"

/*-------------------------------------------------------------------------*/
/* debug routines */

#ifdef CONFIG_USB_DEBUG
unsigned long usbip_debug_flag = 0xffffffff;
#else
unsigned long usbip_debug_flag;
#endif
EXPORT_SYMBOL_GPL(usbip_debug_flag);


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


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

static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
            const char *buf, size_t count)
{
      unsigned long flag;

      sscanf(buf, "%lx", &flag);
      usbip_debug_flag = flag;

      return count;
}
DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);

static void usbip_dump_buffer(char *buff, int bufflen)
{
      int i;

      if (bufflen > 128) {
            for (i = 0; i < 128; i++) {
                  if (i%24 == 0)
                        printk("   ");
                  printk("%02x ", (unsigned char) buff[i]);
                  if (i%4 == 3)
                        printk("| ");
                  if (i%24 == 23)
                        printk("\n");
            }
            printk("... (%d byte)\n", bufflen);
            return;
      }

      for (i = 0; i < bufflen; i++) {
            if (i%24 == 0)
                  printk("   ");
            printk("%02x ", (unsigned char) buff[i]);
            if (i%4 == 3)
                  printk("| ");
            if (i%24 == 23)
                  printk("\n");
      }
      printk("\n");

}

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

      printk("dev(%d) ", dev);
      printk("ep(%d) ",  ep);
      printk("%s ", dir ? "IN" : "OUT");

      switch (type) {
      case PIPE_ISOCHRONOUS:
            printk("%s ", "ISO");
            break;
      case PIPE_INTERRUPT:
            printk("%s ", "INT");
            break;
      case PIPE_CONTROL:
            printk("%s ", "CTL");
            break;
      case PIPE_BULK:
            printk("%s ", "BLK");
            break;
      default:
            printk("ERR");
      }

      printk("\n");

}

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

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

      switch (udev->speed) {
      case USB_SPEED_HIGH:
            printk(" SPD_HIGH");
            break;
      case USB_SPEED_FULL:
            printk(" SPD_FULL");
            break;
      case USB_SPEED_LOW:
            printk(" SPD_LOW");
            break;
      case USB_SPEED_UNKNOWN:
            printk(" SPD_UNKNOWN");
            break;
      default:
            printk(" SPD_ERROR");
      }

      printk(" tt %p, ttport %d", udev->tt, udev->ttport);
      printk("\n");

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

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

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


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

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

      dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);

      dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
            "rawdescriptors %p\n", &udev->descriptor, udev->config,
            udev->actconfig, udev->rawdescriptors);

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

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

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

static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
{
      if (!cmd) {
            printk("      %s : null pointer\n", __func__);
            return;
      }

      printk("       ");
      printk("bRequestType(%02X) ", cmd->bRequestType);
      printk("bRequest(%02X) " , cmd->bRequest);
      printk("wValue(%04X) ", cmd->wValue);
      printk("wIndex(%04X) ", cmd->wIndex);
      printk("wLength(%04X) ", cmd->wLength);

      printk("\n       ");

      if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
            printk("STANDARD ");
            switch (cmd->bRequest) {
            case USB_REQ_GET_STATUS:
                  printk("GET_STATUS");
                  break;
            case USB_REQ_CLEAR_FEATURE:
                  printk("CLEAR_FEAT");
                  break;
            case USB_REQ_SET_FEATURE:
                  printk("SET_FEAT  ");
                  break;
            case USB_REQ_SET_ADDRESS:
                  printk("SET_ADDRRS");
                  break;
            case USB_REQ_GET_DESCRIPTOR:
                  printk("GET_DESCRI");
                  break;
            case USB_REQ_SET_DESCRIPTOR:
                  printk("SET_DESCRI");
                  break;
            case USB_REQ_GET_CONFIGURATION:
                  printk("GET_CONFIG");
                  break;
            case USB_REQ_SET_CONFIGURATION:
                  printk("SET_CONFIG");
                  break;
            case USB_REQ_GET_INTERFACE:
                  printk("GET_INTERF");
                  break;
            case USB_REQ_SET_INTERFACE:
                  printk("SET_INTERF");
                  break;
            case USB_REQ_SYNCH_FRAME:
                  printk("SYNC_FRAME");
                  break;
            default:
                  printk("REQ(%02X) ", cmd->bRequest);
            }

            printk(" ");
            usbip_dump_request_type(cmd->bRequestType);

      } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
            printk("CLASS   ");

      else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
            printk("VENDOR  ");

      else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
            printk("RESERVED");

      printk("\n");
}

void usbip_dump_urb(struct urb *urb)
{
      struct device *dev;

      if (!urb) {
            printk(KERN_DEBUG KBUILD_MODNAME
                   ":%s: urb: null pointer!!\n", __func__);
            return;
      }

      if (!urb->dev) {
            printk(KERN_DEBUG KBUILD_MODNAME
                   ":%s: urb->dev: null pointer!!\n", __func__);
            return;
      }
      dev = &urb->dev->dev;

      dev_dbg(dev, "   urb                   :%p\n", urb);
      dev_dbg(dev, "   dev                   :%p\n", urb->dev);

      usbip_dump_usb_device(urb->dev);

      dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);

      usbip_dump_pipe(urb->pipe);

      dev_dbg(dev, "   status                :%d\n", urb->status);
      dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
      dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
      dev_dbg(dev, "   transfer_buffer_length:%d\n", urb->transfer_buffer_length);
      dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
      dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);

      if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
                  usbip_dump_usb_ctrlrequest(
                  (struct usb_ctrlrequest *)urb->setup_packet);

      dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
      dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
      dev_dbg(dev, "   interval              :%d\n", urb->interval);
      dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
      dev_dbg(dev, "   context               :%p\n", urb->context);
      dev_dbg(dev, "   complete              :%p\n", urb->complete);
}
EXPORT_SYMBOL_GPL(usbip_dump_urb);

void usbip_dump_header(struct usbip_header *pdu)
{
      udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
                  pdu->base.command,
                  pdu->base.seqnum,
                  pdu->base.devid,
                  pdu->base.direction,
                  pdu->base.ep);

      switch (pdu->base.command) {
      case USBIP_CMD_SUBMIT:
            udbg("CMD_SUBMIT: x_flags %u x_len %u sf %u #p %u iv %u\n",
                        pdu->u.cmd_submit.transfer_flags,
                        pdu->u.cmd_submit.transfer_buffer_length,
                        pdu->u.cmd_submit.start_frame,
                        pdu->u.cmd_submit.number_of_packets,
                        pdu->u.cmd_submit.interval);
                        break;
      case USBIP_CMD_UNLINK:
            udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
            break;
      case USBIP_RET_SUBMIT:
            udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
                        pdu->u.ret_submit.status,
                        pdu->u.ret_submit.actual_length,
                        pdu->u.ret_submit.start_frame,
                        pdu->u.ret_submit.error_count);
      case USBIP_RET_UNLINK:
            udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
            break;
      default:
            /* NOT REACHED */
            udbg("UNKNOWN\n");
      }
}
EXPORT_SYMBOL_GPL(usbip_dump_header);


/*-------------------------------------------------------------------------*/
/* thread routines */

int usbip_thread(void *param)
{
      struct usbip_task *ut = param;

      if (!ut)
            return -EINVAL;

      lock_kernel();
      daemonize(ut->name);
      allow_signal(SIGKILL);
      ut->thread = current;
      unlock_kernel();

      /* srv.rb must wait for rx_thread starting */
      complete(&ut->thread_done);

      /* start of while loop */
      ut->loop_ops(ut);

      /* end of loop */
      ut->thread = NULL;

      complete_and_exit(&ut->thread_done, 0);
}

void usbip_start_threads(struct usbip_device *ud)
{
      /*
       * threads are invoked per one device (per one connection).
       */
      kernel_thread(usbip_thread, (void *)&ud->tcp_rx, 0);
      kernel_thread(usbip_thread, (void *)&ud->tcp_tx, 0);

      /* confirm threads are starting */
      wait_for_completion(&ud->tcp_rx.thread_done);
      wait_for_completion(&ud->tcp_tx.thread_done);
}
EXPORT_SYMBOL_GPL(usbip_start_threads);

void usbip_stop_threads(struct usbip_device *ud)
{
      /* kill threads related to this sdev, if v.c. exists */
      if (ud->tcp_rx.thread != NULL) {
            send_sig(SIGKILL, ud->tcp_rx.thread, 1);
            wait_for_completion(&ud->tcp_rx.thread_done);
            udbg("rx_thread for ud %p has finished\n", ud);
      }

      if (ud->tcp_tx.thread != NULL) {
            send_sig(SIGKILL, ud->tcp_tx.thread, 1);
            wait_for_completion(&ud->tcp_tx.thread_done);
            udbg("tx_thread for ud %p has finished\n", ud);
      }
}
EXPORT_SYMBOL_GPL(usbip_stop_threads);

void usbip_task_init(struct usbip_task *ut, char *name,
            void (*loop_ops)(struct usbip_task *))
{
      ut->thread = NULL;
      init_completion(&ut->thread_done);
      ut->name = name;
      ut->loop_ops = loop_ops;
}
EXPORT_SYMBOL_GPL(usbip_task_init);


/*-------------------------------------------------------------------------*/
/* socket routines */

 /*  Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
int usbip_xmit(int send, struct socket *sock, char *buf,
             int size, int msg_flags)
{
      int result;
      struct msghdr msg;
      struct kvec iov;
      int total = 0;

      /* for blocks of if (dbg_flag_xmit) */
      char *bp = buf;
      int osize = size;

      dbg_xmit("enter\n");

      if (!sock || !buf || !size) {
            printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
                   __func__, sock, buf, size);
            return -EINVAL;
      }


      if (dbg_flag_xmit) {
            if (send) {
                  if (!in_interrupt())
                        printk(KERN_DEBUG "%-10s:", current->comm);
                  else
                        printk(KERN_DEBUG "interupt  :");

                  printk("%s: sending... , sock %p, buf %p, "
                         "size %d, msg_flags %d\n", __func__,
                         sock, buf, size, msg_flags);
                  usbip_dump_buffer(buf, size);
            }
      }


      do {
            sock->sk->sk_allocation = GFP_NOIO;
            iov.iov_base    = buf;
            iov.iov_len     = size;
            msg.msg_name    = NULL;
            msg.msg_namelen = 0;
            msg.msg_control = NULL;
            msg.msg_controllen = 0;
            msg.msg_namelen    = 0;
            msg.msg_flags      = msg_flags | MSG_NOSIGNAL;

            if (send)
                  result = kernel_sendmsg(sock, &msg, &iov, 1, size);
            else
                  result = kernel_recvmsg(sock, &msg, &iov, 1, size,
                                                MSG_WAITALL);

            if (result <= 0) {
                  udbg("usbip_xmit: %s sock %p buf %p size %u ret %d"
                              " total %d\n",
                              send ? "send" : "receive", sock, buf,
                              size, result, total);
                  goto err;
            }

            size -= result;
            buf += result;
            total += result;

      } while (size > 0);


      if (dbg_flag_xmit) {
            if (!send) {
                  if (!in_interrupt())
                        printk(KERN_DEBUG "%-10s:", current->comm);
                  else
                        printk(KERN_DEBUG "interupt  :");

                  printk("usbip_xmit: receiving....\n");
                  usbip_dump_buffer(bp, osize);
                  printk("usbip_xmit: received, osize %d ret %d size %d "
                              "total %d\n", osize, result, size,
                              total);
            }

            if (send)
                  printk("usbip_xmit: send, total %d\n", total);
      }

      return total;

err:
      return result;
}
EXPORT_SYMBOL_GPL(usbip_xmit);


/* now a usrland utility should set options. */
#if 0
int setquickack(struct socket *socket)
{
      mm_segment_t oldfs;
      int val = 1;
      int ret;

      oldfs = get_fs();
      set_fs(get_ds());
      ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_QUICKACK,
                  (char __user *) &val, sizeof(ret));
      set_fs(oldfs);

      return ret;
}

int setnodelay(struct socket *socket)
{
      mm_segment_t oldfs;
      int val = 1;
      int ret;

      oldfs = get_fs();
      set_fs(get_ds());
      ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_NODELAY,
                  (char __user *) &val, sizeof(ret));
      set_fs(oldfs);

      return ret;
}

int setkeepalive(struct socket *socket)
{
      mm_segment_t oldfs;
      int val = 1;
      int ret;

      oldfs = get_fs();
      set_fs(get_ds());
      ret = socket->ops->setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE,
                  (char __user *) &val, sizeof(ret));
      set_fs(oldfs);

      return ret;
}

void setreuse(struct socket *socket)
{
      socket->sk->sk_reuse = 1;
}
#endif

struct socket *sockfd_to_socket(unsigned int sockfd)
{
      struct socket *socket;
      struct file *file;
      struct inode *inode;

      file = fget(sockfd);
      if (!file) {
            printk(KERN_ERR "%s: invalid sockfd\n", __func__);
            return NULL;
      }

      inode = file->f_dentry->d_inode;

      if (!inode || !S_ISSOCK(inode->i_mode))
            return NULL;

      socket = SOCKET_I(inode);

      return socket;
}
EXPORT_SYMBOL_GPL(sockfd_to_socket);



/*-------------------------------------------------------------------------*/
/* pdu routines */

/* there may be more cases to tweak the flags. */
static unsigned int tweak_transfer_flags(unsigned int flags)
{

      if (flags & URB_NO_TRANSFER_DMA_MAP)
            /*
             * vhci_hcd does not provide DMA-mapped I/O. The upper
             * driver does not need to set this flag. The remote
             * usbip.ko does not still perform DMA-mapped I/O for
             * DMA-caplable host controllers. So, clear this flag.
             */
            flags &= ~URB_NO_TRANSFER_DMA_MAP;

      if (flags & URB_NO_SETUP_DMA_MAP)
            flags &= ~URB_NO_SETUP_DMA_MAP;

      return flags;
}

static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
                                                int pack)
{
      struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;

      /*
       * Some members are not still implemented in usbip. I hope this issue
       * will be discussed when usbip is ported to other operating systems.
       */
      if (pack) {
            /* vhci_tx.c */
            spdu->transfer_flags =
                        tweak_transfer_flags(urb->transfer_flags);
            spdu->transfer_buffer_length  = urb->transfer_buffer_length;
            spdu->start_frame       = urb->start_frame;
            spdu->number_of_packets       = urb->number_of_packets;
            spdu->interval                = urb->interval;
      } else  {
            /* stub_rx.c */
            urb->transfer_flags         = spdu->transfer_flags;

            urb->transfer_buffer_length = spdu->transfer_buffer_length;
            urb->start_frame            = spdu->start_frame;
            urb->number_of_packets      = spdu->number_of_packets;
            urb->interval               = spdu->interval;
      }
}

static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
                                                int pack)
{
      struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;

      if (pack) {
            /* stub_tx.c */

            rpdu->status            = urb->status;
            rpdu->actual_length     = urb->actual_length;
            rpdu->start_frame = urb->start_frame;
            rpdu->error_count = urb->error_count;
      } else {
            /* vhci_rx.c */

            urb->status       = rpdu->status;
            urb->actual_length      = rpdu->actual_length;
            urb->start_frame  = rpdu->start_frame;
            urb->error_count  = rpdu->error_count;
      }
}


void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
                                                int pack)
{
      switch (cmd) {
      case USBIP_CMD_SUBMIT:
            usbip_pack_cmd_submit(pdu, urb, pack);
            break;
      case USBIP_RET_SUBMIT:
            usbip_pack_ret_submit(pdu, urb, pack);
            break;
      default:
            err("unknown command");
            /* NOTREACHED */
            /* BUG(); */
      }
}
EXPORT_SYMBOL_GPL(usbip_pack_pdu);


static void correct_endian_basic(struct usbip_header_basic *base, int send)
{
      if (send) {
            base->command     = cpu_to_be32(base->command);
            base->seqnum      = cpu_to_be32(base->seqnum);
            base->devid = cpu_to_be32(base->devid);
            base->direction   = cpu_to_be32(base->direction);
            base->ep    = cpu_to_be32(base->ep);
      } else {
            base->command     = be32_to_cpu(base->command);
            base->seqnum      = be32_to_cpu(base->seqnum);
            base->devid = be32_to_cpu(base->devid);
            base->direction   = be32_to_cpu(base->direction);
            base->ep    = be32_to_cpu(base->ep);
      }
}

static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
                                                int send)
{
      if (send) {
            pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);

            cpu_to_be32s(&pdu->transfer_buffer_length);
            cpu_to_be32s(&pdu->start_frame);
            cpu_to_be32s(&pdu->number_of_packets);
            cpu_to_be32s(&pdu->interval);
      } else {
            pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);

            be32_to_cpus(&pdu->transfer_buffer_length);
            be32_to_cpus(&pdu->start_frame);
            be32_to_cpus(&pdu->number_of_packets);
            be32_to_cpus(&pdu->interval);
      }
}

static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
                                                int send)
{
      if (send) {
            cpu_to_be32s(&pdu->status);
            cpu_to_be32s(&pdu->actual_length);
            cpu_to_be32s(&pdu->start_frame);
            cpu_to_be32s(&pdu->error_count);
      } else {
            be32_to_cpus(&pdu->status);
            be32_to_cpus(&pdu->actual_length);
            be32_to_cpus(&pdu->start_frame);
            be32_to_cpus(&pdu->error_count);
      }
}

static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
                                                int send)
{
      if (send)
            pdu->seqnum = cpu_to_be32(pdu->seqnum);
      else
            pdu->seqnum = be32_to_cpu(pdu->seqnum);
}

static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
                                                int send)
{
      if (send)
            cpu_to_be32s(&pdu->status);
      else
            be32_to_cpus(&pdu->status);
}

void usbip_header_correct_endian(struct usbip_header *pdu, int send)
{
      __u32 cmd = 0;

      if (send)
            cmd = pdu->base.command;

      correct_endian_basic(&pdu->base, send);

      if (!send)
            cmd = pdu->base.command;

      switch (cmd) {
      case USBIP_CMD_SUBMIT:
            correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
            break;
      case USBIP_RET_SUBMIT:
            correct_endian_ret_submit(&pdu->u.ret_submit, send);
            break;
      case USBIP_CMD_UNLINK:
            correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
            break;
      case USBIP_RET_UNLINK:
            correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
            break;
      default:
            /* NOTREACHED */
            err("unknown command in pdu header: %d", cmd);
            /* BUG(); */
      }
}
EXPORT_SYMBOL_GPL(usbip_header_correct_endian);

static void usbip_iso_pakcet_correct_endian(
                        struct usbip_iso_packet_descriptor *iso,
                        int send)
{
      /* does not need all members. but copy all simply. */
      if (send) {
            iso->offset = cpu_to_be32(iso->offset);
            iso->length = cpu_to_be32(iso->length);
            iso->status = cpu_to_be32(iso->status);
            iso->actual_length = cpu_to_be32(iso->actual_length);
      } else {
            iso->offset = be32_to_cpu(iso->offset);
            iso->length = be32_to_cpu(iso->length);
            iso->status = be32_to_cpu(iso->status);
            iso->actual_length = be32_to_cpu(iso->actual_length);
      }
}

static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
            struct usb_iso_packet_descriptor *uiso, int pack)
{
      if (pack) {
            iso->offset       = uiso->offset;
            iso->length       = uiso->length;
            iso->status       = uiso->status;
            iso->actual_length      = uiso->actual_length;
      } else {
            uiso->offset            = iso->offset;
            uiso->length            = iso->length;
            uiso->status            = iso->status;
            uiso->actual_length     = iso->actual_length;
      }
}


/* must free buffer */
void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
{
      void *buff;
      struct usbip_iso_packet_descriptor *iso;
      int np = urb->number_of_packets;
      ssize_t size = np * sizeof(*iso);
      int i;

      buff = kzalloc(size, GFP_KERNEL);
      if (!buff)
            return NULL;

      for (i = 0; i < np; i++) {
            iso = buff + (i * sizeof(*iso));

            usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
            usbip_iso_pakcet_correct_endian(iso, 1);
      }

      *bufflen = size;

      return buff;
}
EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);

/* some members of urb must be substituted before. */
int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
{
      void *buff;
      struct usbip_iso_packet_descriptor *iso;
      int np = urb->number_of_packets;
      int size = np * sizeof(*iso);
      int i;
      int ret;

      if (!usb_pipeisoc(urb->pipe))
            return 0;

      /* my Bluetooth dongle gets ISO URBs which are np = 0 */
      if (np == 0) {
            /* uinfo("iso np == 0\n"); */
            /* usbip_dump_urb(urb); */
            return 0;
      }

      buff = kzalloc(size, GFP_KERNEL);
      if (!buff)
            return -ENOMEM;

      ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
      if (ret != size) {
            dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
                  ret);
            kfree(buff);

            if (ud->side == USBIP_STUB)
                  usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
            else
                  usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);

            return -EPIPE;
      }

      for (i = 0; i < np; i++) {
            iso = buff + (i * sizeof(*iso));

            usbip_iso_pakcet_correct_endian(iso, 0);
            usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
      }


      kfree(buff);

      return ret;
}
EXPORT_SYMBOL_GPL(usbip_recv_iso);


/* some members of urb must be substituted before. */
int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
{
      int ret;
      int size;

      if (ud->side == USBIP_STUB) {
            /* stub_rx.c */
            /* the direction of urb must be OUT. */
            if (usb_pipein(urb->pipe))
                  return 0;

            size = urb->transfer_buffer_length;
      } else {
            /* vhci_rx.c */
            /* the direction of urb must be IN. */
            if (usb_pipeout(urb->pipe))
                  return 0;

            size = urb->actual_length;
      }

      /* no need to recv xbuff */
      if (!(size > 0))
            return 0;

      ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
                   size, 0);
      if (ret != size) {
            dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
            if (ud->side == USBIP_STUB) {
                  usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
            } else {
                  usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
                  return -EPIPE;
            }
      }

      return ret;
}
EXPORT_SYMBOL_GPL(usbip_recv_xbuff);


/*-------------------------------------------------------------------------*/

static int __init usbip_common_init(void)
{
      printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);

      return 0;
}

static void __exit usbip_common_exit(void)
{
      return;
}




module_init(usbip_common_init);
module_exit(usbip_common_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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