drivers/staging/usbip/usbip_common.c

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  *
   4  * This is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/file.h>
  23 #include <linux/tcp.h>
  24 #include <linux/in.h>
  25 #include <linux/kthread.h>
  26 #include <linux/slab.h>
  27 #include "usbip_common.h"
  28
  29 /* version information */
  30 #define DRIVER_VERSION "1.0"
  31 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
  32 #define DRIVER_DESC "usbip common driver"
  33
  34 /*-------------------------------------------------------------------------*/
  35 /* debug routines */
  36
  37 #ifdef CONFIG_USB_IP_DEBUG_ENABLE
  38 unsigned long usbip_debug_flag = 0xffffffff;
  39 #else
  40 unsigned long usbip_debug_flag;
  41 #endif
  42 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  43
  44
  45 /* FIXME */
  46 struct device_attribute dev_attr_usbip_debug;
  47 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  48
  49
  50 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  51                                                                 char *buf)
  52 {
  53         return sprintf(buf, "%lx\n", usbip_debug_flag);
  54 }
  55
  56 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  57                 const char *buf, size_t count)
  58 {
  59         sscanf(buf, "%lx", &usbip_debug_flag);
  60
  61         return count;
  62 }
  63 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  64
  65 static void usbip_dump_buffer(char *buff, int bufflen)
  66 {
  67         print_hex_dump(KERN_DEBUG, "usb-ip", DUMP_PREFIX_OFFSET, 16, 4,
  68                        buff, bufflen, false);
  69 }
  70
  71 static void usbip_dump_pipe(unsigned int p)
  72 {
  73         unsigned char type = usb_pipetype(p);
  74         unsigned char ep = usb_pipeendpoint(p);
  75         unsigned char dev = usb_pipedevice(p);
  76         unsigned char dir = usb_pipein(p);
  77
  78         printk(KERN_DEBUG "dev(%d) ", dev);
  79         printk(KERN_DEBUG "ep(%d) ",  ep);
  80         printk(KERN_DEBUG "%s ", dir ? "IN" : "OUT");
  81
  82         switch (type) {
  83         case PIPE_ISOCHRONOUS:
  84                 printk(KERN_DEBUG "%s ", "ISO");
  85                 break;
  86         case PIPE_INTERRUPT:
  87                 printk(KERN_DEBUG "%s ", "INT");
  88                 break;
  89         case PIPE_CONTROL:
  90                 printk(KERN_DEBUG "%s ", "CTL");
  91                 break;
  92         case PIPE_BULK:
  93                 printk(KERN_DEBUG "%s ", "BLK");
  94                 break;
  95         default:
  96                 printk(KERN_DEBUG "ERR");
  97         }
  98
  99         printk(KERN_DEBUG "\n");
 100
 101 }
 102
 103 static void usbip_dump_usb_device(struct usb_device *udev)
 104 {
 105         struct device *dev = &udev->dev;
 106         int i;
 107
 108         dev_dbg(dev, "       devnum(%d) devpath(%s)",
 109                 udev->devnum, udev->devpath);
 110
 111         switch (udev->speed) {
 112         case USB_SPEED_HIGH:
 113                 printk(KERN_DEBUG " SPD_HIGH");
 114                 break;
 115         case USB_SPEED_FULL:
 116                 printk(KERN_DEBUG " SPD_FULL");
 117                 break;
 118         case USB_SPEED_LOW:
 119                 printk(KERN_DEBUG " SPD_LOW");
 120                 break;
 121         case USB_SPEED_UNKNOWN:
 122                 printk(KERN_DEBUG " SPD_UNKNOWN");
 123                 break;
 124         default:
 125                 printk(KERN_DEBUG " SPD_ERROR");
 126         }
 127
 128         printk(KERN_DEBUG " tt %p, ttport %d", udev->tt, udev->ttport);
 129         printk(KERN_DEBUG "\n");
 130
 131         dev_dbg(dev, "                    ");
 132         for (i = 0; i < 16; i++)
 133                 printk(KERN_DEBUG " %2u", i);
 134         printk(KERN_DEBUG "\n");
 135
 136         dev_dbg(dev, "       toggle0(IN) :");
 137         for (i = 0; i < 16; i++)
 138                 printk(KERN_DEBUG " %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 139         printk(KERN_DEBUG "\n");
 140
 141         dev_dbg(dev, "       toggle1(OUT):");
 142         for (i = 0; i < 16; i++)
 143                 printk(KERN_DEBUG " %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 144         printk(KERN_DEBUG "\n");
 145
 146
 147         dev_dbg(dev, "       epmaxp_in   :");
 148         for (i = 0; i < 16; i++) {
 149                 if (udev->ep_in[i])
 150                         printk(KERN_DEBUG " %2u",
 151                              le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 152         }
 153         printk(KERN_DEBUG "\n");
 154
 155         dev_dbg(dev, "       epmaxp_out  :");
 156         for (i = 0; i < 16; i++) {
 157                 if (udev->ep_out[i])
 158                         printk(KERN_DEBUG " %2u",
 159                              le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 160         }
 161         printk(KERN_DEBUG "\n");
 162
 163         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 164
 165         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 166                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 167                 udev->actconfig, udev->rawdescriptors);
 168
 169         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 170                 udev->have_langid, udev->string_langid);
 171
 172         dev_dbg(dev, "maxchild %d, children %p\n",
 173                 udev->maxchild, udev->children);
 174 }
 175
 176 static void usbip_dump_request_type(__u8 rt)
 177 {
 178         switch (rt & USB_RECIP_MASK) {
 179         case USB_RECIP_DEVICE:
 180                 printk(KERN_DEBUG "DEVICE");
 181                 break;
 182         case USB_RECIP_INTERFACE:
 183                 printk(KERN_DEBUG "INTERF");
 184                 break;
 185         case USB_RECIP_ENDPOINT:
 186                 printk(KERN_DEBUG "ENDPOI");
 187                 break;
 188         case USB_RECIP_OTHER:
 189                 printk(KERN_DEBUG "OTHER ");
 190                 break;
 191         default:
 192                 printk(KERN_DEBUG "------");
 193         }
 194 }
 195
 196 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 197 {
 198         if (!cmd) {
 199                 printk(KERN_DEBUG "      %s : null pointer\n", __func__);
 200                 return;
 201         }
 202
 203         printk(KERN_DEBUG "       ");
 204         printk(KERN_DEBUG "bRequestType(%02X) ", cmd->bRequestType);
 205         printk(KERN_DEBUG "bRequest(%02X) " , cmd->bRequest);
 206         printk(KERN_DEBUG "wValue(%04X) ", cmd->wValue);
 207         printk(KERN_DEBUG "wIndex(%04X) ", cmd->wIndex);
 208         printk(KERN_DEBUG "wLength(%04X) ", cmd->wLength);
 209
 210         printk(KERN_DEBUG "\n       ");
 211
 212         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 213                 printk(KERN_DEBUG "STANDARD ");
 214                 switch (cmd->bRequest) {
 215                 case USB_REQ_GET_STATUS:
 216                         printk(KERN_DEBUG "GET_STATUS");
 217                         break;
 218                 case USB_REQ_CLEAR_FEATURE:
 219                         printk(KERN_DEBUG "CLEAR_FEAT");
 220                         break;
 221                 case USB_REQ_SET_FEATURE:
 222                         printk(KERN_DEBUG "SET_FEAT  ");
 223                         break;
 224                 case USB_REQ_SET_ADDRESS:
 225                         printk(KERN_DEBUG "SET_ADDRRS");
 226                         break;
 227                 case USB_REQ_GET_DESCRIPTOR:
 228                         printk(KERN_DEBUG "GET_DESCRI");
 229                         break;
 230                 case USB_REQ_SET_DESCRIPTOR:
 231                         printk(KERN_DEBUG "SET_DESCRI");
 232                         break;
 233                 case USB_REQ_GET_CONFIGURATION:
 234                         printk(KERN_DEBUG "GET_CONFIG");
 235                         break;
 236                 case USB_REQ_SET_CONFIGURATION:
 237                         printk(KERN_DEBUG "SET_CONFIG");
 238                         break;
 239                 case USB_REQ_GET_INTERFACE:
 240                         printk(KERN_DEBUG "GET_INTERF");
 241                         break;
 242                 case USB_REQ_SET_INTERFACE:
 243                         printk(KERN_DEBUG "SET_INTERF");
 244                         break;
 245                 case USB_REQ_SYNCH_FRAME:
 246                         printk(KERN_DEBUG "SYNC_FRAME");
 247                         break;
 248                 default:
 249                         printk(KERN_DEBUG "REQ(%02X) ", cmd->bRequest);
 250                 }
 251
 252                 printk(KERN_DEBUG " ");
 253                 usbip_dump_request_type(cmd->bRequestType);
 254
 255         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
 256                 printk(KERN_DEBUG "CLASS   ");
 257
 258         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
 259                 printk(KERN_DEBUG "VENDOR  ");
 260
 261         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
 262                 printk(KERN_DEBUG "RESERVED");
 263
 264         printk(KERN_DEBUG "\n");
 265 }
 266
 267 void usbip_dump_urb(struct urb *urb)
 268 {
 269         struct device *dev;
 270
 271         if (!urb) {
 272                 printk(KERN_DEBUG KBUILD_MODNAME
 273                        ":%s: urb: null pointer!!\n", __func__);
 274                 return;
 275         }
 276
 277         if (!urb->dev) {
 278                 printk(KERN_DEBUG KBUILD_MODNAME
 279                        ":%s: urb->dev: null pointer!!\n", __func__);
 280                 return;
 281         }
 282         dev = &urb->dev->dev;
 283
 284         dev_dbg(dev, "   urb                   :%p\n", urb);
 285         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 286
 287         usbip_dump_usb_device(urb->dev);
 288
 289         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 290
 291         usbip_dump_pipe(urb->pipe);
 292
 293         dev_dbg(dev, "   status                :%d\n", urb->status);
 294         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 295         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 296         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 297                                                 urb->transfer_buffer_length);
 298         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 299         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 300
 301         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 302                         usbip_dump_usb_ctrlrequest(
 303                         (struct usb_ctrlrequest *)urb->setup_packet);
 304
 305         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 306         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 307         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 308         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 309         dev_dbg(dev, "   context               :%p\n", urb->context);
 310         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 311 }
 312 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 313
 314 void usbip_dump_header(struct usbip_header *pdu)
 315 {
 316         usbip_udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 317                         pdu->base.command,
 318                         pdu->base.seqnum,
 319                         pdu->base.devid,
 320                         pdu->base.direction,
 321                         pdu->base.ep);
 322
 323         switch (pdu->base.command) {
 324         case USBIP_CMD_SUBMIT:
 325                 usbip_udbg("CMD_SUBMIT: "
 326                                 "x_flags %u x_len %u sf %u #p %u iv %u\n",
 327                                 pdu->u.cmd_submit.transfer_flags,
 328                                 pdu->u.cmd_submit.transfer_buffer_length,
 329                                 pdu->u.cmd_submit.start_frame,
 330                                 pdu->u.cmd_submit.number_of_packets,
 331                                 pdu->u.cmd_submit.interval);
 332                                 break;
 333         case USBIP_CMD_UNLINK:
 334                 usbip_udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
 335                 break;
 336         case USBIP_RET_SUBMIT:
 337                 usbip_udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
 338                                 pdu->u.ret_submit.status,
 339                                 pdu->u.ret_submit.actual_length,
 340                                 pdu->u.ret_submit.start_frame,
 341                                 pdu->u.ret_submit.error_count);
 342         case USBIP_RET_UNLINK:
 343                 usbip_udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
 344                 break;
 345         default:
 346                 /* NOT REACHED */
 347                 usbip_udbg("UNKNOWN\n");
 348         }
 349 }
 350 EXPORT_SYMBOL_GPL(usbip_dump_header);
 351
 352
 353 /*-------------------------------------------------------------------------*/
 354 /* thread routines */
 355
 356 int usbip_thread(void *param)
 357 {
 358         struct usbip_task *ut = param;
 359
 360         if (!ut)
 361                 return -EINVAL;
 362
 363         lock_kernel();
 364         daemonize(ut->name);
 365         allow_signal(SIGKILL);
 366         ut->thread = current;
 367         unlock_kernel();
 368
 369         /* srv.rb must wait for rx_thread starting */
 370         complete(&ut->thread_done);
 371
 372         /* start of while loop */
 373         ut->loop_ops(ut);
 374
 375         /* end of loop */
 376         ut->thread = NULL;
 377
 378         complete_and_exit(&ut->thread_done, 0);
 379 }
 380
 381 int usbip_start_threads(struct usbip_device *ud)
 382 {
 383         /*
 384          * threads are invoked per one device (per one connection).
 385          */
 386         struct task_struct *th;
 387
 388         th = kthread_run(usbip_thread, (void *)&ud->tcp_rx, "usbip");
 389         if (IS_ERR(th)) {
 390                 printk(KERN_WARNING
 391                         "Unable to start control thread\n");
 392                 return PTR_ERR(th);
 393         }
 394         th = kthread_run(usbip_thread, (void *)&ud->tcp_tx, "usbip");
 395         if (IS_ERR(th)) {
 396                 printk(KERN_WARNING
 397                         "Unable to start control thread\n");
 398                 return PTR_ERR(th);
 399         }
 400
 401         /* confirm threads are starting */
 402         wait_for_completion(&ud->tcp_rx.thread_done);
 403         wait_for_completion(&ud->tcp_tx.thread_done);
 404         return 0;
 405 }
 406 EXPORT_SYMBOL_GPL(usbip_start_threads);
 407
 408 void usbip_stop_threads(struct usbip_device *ud)
 409 {
 410         /* kill threads related to this sdev, if v.c. exists */
 411         if (ud->tcp_rx.thread != NULL) {
 412                 send_sig(SIGKILL, ud->tcp_rx.thread, 1);
 413                 wait_for_completion(&ud->tcp_rx.thread_done);
 414                 usbip_udbg("rx_thread for ud %p has finished\n", ud);
 415         }
 416
 417         if (ud->tcp_tx.thread != NULL) {
 418                 send_sig(SIGKILL, ud->tcp_tx.thread, 1);
 419                 wait_for_completion(&ud->tcp_tx.thread_done);
 420                 usbip_udbg("tx_thread for ud %p has finished\n", ud);
 421         }
 422 }
 423 EXPORT_SYMBOL_GPL(usbip_stop_threads);
 424
 425 void usbip_task_init(struct usbip_task *ut, char *name,
 426                 void (*loop_ops)(struct usbip_task *))
 427 {
 428         ut->thread = NULL;
 429         init_completion(&ut->thread_done);
 430         ut->name = name;
 431         ut->loop_ops = loop_ops;
 432 }
 433 EXPORT_SYMBOL_GPL(usbip_task_init);
 434
 435
 436 /*-------------------------------------------------------------------------*/
 437 /* socket routines */
 438
 439  /*  Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 440 int usbip_xmit(int send, struct socket *sock, char *buf,
 441                int size, int msg_flags)
 442 {
 443         int result;
 444         struct msghdr msg;
 445         struct kvec iov;
 446         int total = 0;
 447
 448         /* for blocks of if (usbip_dbg_flag_xmit) */
 449         char *bp = buf;
 450         int osize = size;
 451
 452         usbip_dbg_xmit("enter\n");
 453
 454         if (!sock || !buf || !size) {
 455                 printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
 456                        __func__, sock, buf, size);
 457                 return -EINVAL;
 458         }
 459
 460
 461         if (usbip_dbg_flag_xmit) {
 462                 if (send) {
 463                         if (!in_interrupt())
 464                                 printk(KERN_DEBUG "%-10s:", current->comm);
 465                         else
 466                                 printk(KERN_DEBUG "interrupt  :");
 467
 468                         printk(KERN_DEBUG "%s: sending... , sock %p, buf %p, "
 469                                "size %d, msg_flags %d\n", __func__,
 470                                sock, buf, size, msg_flags);
 471                         usbip_dump_buffer(buf, size);
 472                 }
 473         }
 474
 475
 476         do {
 477                 sock->sk->sk_allocation = GFP_NOIO;
 478                 iov.iov_base    = buf;
 479                 iov.iov_len     = size;
 480                 msg.msg_name    = NULL;
 481                 msg.msg_namelen = 0;
 482                 msg.msg_control = NULL;
 483                 msg.msg_controllen = 0;
 484                 msg.msg_namelen    = 0;
 485                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 486
 487                 if (send)
 488                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 489                 else
 490                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 491                                                                 MSG_WAITALL);
 492
 493                 if (result <= 0) {
 494                         usbip_udbg("usbip_xmit: %s sock %p buf %p size %u ret "
 495                                         "%d total %d\n",
 496                                         send ? "send" : "receive", sock, buf,
 497                                         size, result, total);
 498                         goto err;
 499                 }
 500
 501                 size -= result;
 502                 buf += result;
 503                 total += result;
 504
 505         } while (size > 0);
 506
 507
 508         if (usbip_dbg_flag_xmit) {
 509                 if (!send) {
 510                         if (!in_interrupt())
 511                                 printk(KERN_DEBUG "%-10s:", current->comm);
 512                         else
 513                                 printk(KERN_DEBUG "interrupt  :");
 514
 515                         printk(KERN_DEBUG "usbip_xmit: receiving....\n");
 516                         usbip_dump_buffer(bp, osize);
 517                         printk(KERN_DEBUG "usbip_xmit: received, osize %d ret "
 518                                         "%d size %d total %d\n", osize, result,
 519                                         size, total);
 520                 }
 521
 522                 if (send)
 523                         printk(KERN_DEBUG "usbip_xmit: send, total %d\n",
 524                                                                         total);
 525         }
 526
 527         return total;
 528
 529 err:
 530         return result;
 531 }
 532 EXPORT_SYMBOL_GPL(usbip_xmit);
 533
 534 struct socket *sockfd_to_socket(unsigned int sockfd)
 535 {
 536         struct socket *socket;
 537         struct file *file;
 538         struct inode *inode;
 539
 540         file = fget(sockfd);
 541         if (!file) {
 542                 printk(KERN_ERR "%s: invalid sockfd\n", __func__);
 543                 return NULL;
 544         }
 545
 546         inode = file->f_dentry->d_inode;
 547
 548         if (!inode || !S_ISSOCK(inode->i_mode))
 549                 return NULL;
 550
 551         socket = SOCKET_I(inode);
 552
 553         return socket;
 554 }
 555 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 556
 557
 558
 559 /*-------------------------------------------------------------------------*/
 560 /* pdu routines */
 561
 562 /* there may be more cases to tweak the flags. */
 563 static unsigned int tweak_transfer_flags(unsigned int flags)
 564 {
 565         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 566         return flags;
 567 }
 568
 569 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 570                                                                 int pack)
 571 {
 572         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 573
 574         /*
 575          * Some members are not still implemented in usbip. I hope this issue
 576          * will be discussed when usbip is ported to other operating systems.
 577          */
 578         if (pack) {
 579                 /* vhci_tx.c */
 580                 spdu->transfer_flags =
 581                                 tweak_transfer_flags(urb->transfer_flags);
 582                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 583                 spdu->start_frame               = urb->start_frame;
 584                 spdu->number_of_packets         = urb->number_of_packets;
 585                 spdu->interval                  = urb->interval;
 586         } else  {
 587                 /* stub_rx.c */
 588                 urb->transfer_flags         = spdu->transfer_flags;
 589
 590                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 591                 urb->start_frame            = spdu->start_frame;
 592                 urb->number_of_packets      = spdu->number_of_packets;
 593                 urb->interval               = spdu->interval;
 594         }
 595 }
 596
 597 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 598                                                                 int pack)
 599 {
 600         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 601
 602         if (pack) {
 603                 /* stub_tx.c */
 604
 605                 rpdu->status            = urb->status;
 606                 rpdu->actual_length     = urb->actual_length;
 607                 rpdu->start_frame       = urb->start_frame;
 608                 rpdu->error_count       = urb->error_count;
 609         } else {
 610                 /* vhci_rx.c */
 611
 612                 urb->status             = rpdu->status;
 613                 urb->actual_length      = rpdu->actual_length;
 614                 urb->start_frame        = rpdu->start_frame;
 615                 urb->error_count        = rpdu->error_count;
 616         }
 617 }
 618
 619
 620 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 621                                                                 int pack)
 622 {
 623         switch (cmd) {
 624         case USBIP_CMD_SUBMIT:
 625                 usbip_pack_cmd_submit(pdu, urb, pack);
 626                 break;
 627         case USBIP_RET_SUBMIT:
 628                 usbip_pack_ret_submit(pdu, urb, pack);
 629                 break;
 630         default:
 631                 err("unknown command");
 632                 /* NOTREACHED */
 633                 /* BUG(); */
 634         }
 635 }
 636 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 637
 638
 639 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 640 {
 641         if (send) {
 642                 base->command   = cpu_to_be32(base->command);
 643                 base->seqnum    = cpu_to_be32(base->seqnum);
 644                 base->devid     = cpu_to_be32(base->devid);
 645                 base->direction = cpu_to_be32(base->direction);
 646                 base->ep        = cpu_to_be32(base->ep);
 647         } else {
 648                 base->command   = be32_to_cpu(base->command);
 649                 base->seqnum    = be32_to_cpu(base->seqnum);
 650                 base->devid     = be32_to_cpu(base->devid);
 651                 base->direction = be32_to_cpu(base->direction);
 652                 base->ep        = be32_to_cpu(base->ep);
 653         }
 654 }
 655
 656 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 657                                                                 int send)
 658 {
 659         if (send) {
 660                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 661
 662                 cpu_to_be32s(&pdu->transfer_buffer_length);
 663                 cpu_to_be32s(&pdu->start_frame);
 664                 cpu_to_be32s(&pdu->number_of_packets);
 665                 cpu_to_be32s(&pdu->interval);
 666         } else {
 667                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 668
 669                 be32_to_cpus(&pdu->transfer_buffer_length);
 670                 be32_to_cpus(&pdu->start_frame);
 671                 be32_to_cpus(&pdu->number_of_packets);
 672                 be32_to_cpus(&pdu->interval);
 673         }
 674 }
 675
 676 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 677                                                                 int send)
 678 {
 679         if (send) {
 680                 cpu_to_be32s(&pdu->status);
 681                 cpu_to_be32s(&pdu->actual_length);
 682                 cpu_to_be32s(&pdu->start_frame);
 683                 cpu_to_be32s(&pdu->error_count);
 684         } else {
 685                 be32_to_cpus(&pdu->status);
 686                 be32_to_cpus(&pdu->actual_length);
 687                 be32_to_cpus(&pdu->start_frame);
 688                 be32_to_cpus(&pdu->error_count);
 689         }
 690 }
 691
 692 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 693                                                                 int send)
 694 {
 695         if (send)
 696                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 697         else
 698                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 699 }
 700
 701 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 702                                                                 int send)
 703 {
 704         if (send)
 705                 cpu_to_be32s(&pdu->status);
 706         else
 707                 be32_to_cpus(&pdu->status);
 708 }
 709
 710 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 711 {
 712         __u32 cmd = 0;
 713
 714         if (send)
 715                 cmd = pdu->base.command;
 716
 717         correct_endian_basic(&pdu->base, send);
 718
 719         if (!send)
 720                 cmd = pdu->base.command;
 721
 722         switch (cmd) {
 723         case USBIP_CMD_SUBMIT:
 724                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 725                 break;
 726         case USBIP_RET_SUBMIT:
 727                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 728                 break;
 729         case USBIP_CMD_UNLINK:
 730                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 731                 break;
 732         case USBIP_RET_UNLINK:
 733                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 734                 break;
 735         default:
 736                 /* NOTREACHED */
 737                 err("unknown command in pdu header: %d", cmd);
 738                 /* BUG(); */
 739         }
 740 }
 741 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 742
 743 static void usbip_iso_pakcet_correct_endian(
 744                                 struct usbip_iso_packet_descriptor *iso,
 745                                 int send)
 746 {
 747         /* does not need all members. but copy all simply. */
 748         if (send) {
 749                 iso->offset     = cpu_to_be32(iso->offset);
 750                 iso->length     = cpu_to_be32(iso->length);
 751                 iso->status     = cpu_to_be32(iso->status);
 752                 iso->actual_length = cpu_to_be32(iso->actual_length);
 753         } else {
 754                 iso->offset     = be32_to_cpu(iso->offset);
 755                 iso->length     = be32_to_cpu(iso->length);
 756                 iso->status     = be32_to_cpu(iso->status);
 757                 iso->actual_length = be32_to_cpu(iso->actual_length);
 758         }
 759 }
 760
 761 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 762                 struct usb_iso_packet_descriptor *uiso, int pack)
 763 {
 764         if (pack) {
 765                 iso->offset             = uiso->offset;
 766                 iso->length             = uiso->length;
 767                 iso->status             = uiso->status;
 768                 iso->actual_length      = uiso->actual_length;
 769         } else {
 770                 uiso->offset            = iso->offset;
 771                 uiso->length            = iso->length;
 772                 uiso->status            = iso->status;
 773                 uiso->actual_length     = iso->actual_length;
 774         }
 775 }
 776
 777
 778 /* must free buffer */
 779 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 780 {
 781         void *buff;
 782         struct usbip_iso_packet_descriptor *iso;
 783         int np = urb->number_of_packets;
 784         ssize_t size = np * sizeof(*iso);
 785         int i;
 786
 787         buff = kzalloc(size, GFP_KERNEL);
 788         if (!buff)
 789                 return NULL;
 790
 791         for (i = 0; i < np; i++) {
 792                 iso = buff + (i * sizeof(*iso));
 793
 794                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 795                 usbip_iso_pakcet_correct_endian(iso, 1);
 796         }
 797
 798         *bufflen = size;
 799
 800         return buff;
 801 }
 802 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 803
 804 /* some members of urb must be substituted before. */
 805 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 806 {
 807         void *buff;
 808         struct usbip_iso_packet_descriptor *iso;
 809         int np = urb->number_of_packets;
 810         int size = np * sizeof(*iso);
 811         int i;
 812         int ret;
 813
 814         if (!usb_pipeisoc(urb->pipe))
 815                 return 0;
 816
 817         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 818         if (np == 0) {
 819                 /* usbip_uinfo("iso np == 0\n"); */
 820                 /* usbip_dump_urb(urb); */
 821                 return 0;
 822         }
 823
 824         buff = kzalloc(size, GFP_KERNEL);
 825         if (!buff)
 826                 return -ENOMEM;
 827
 828         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 829         if (ret != size) {
 830                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 831                         ret);
 832                 kfree(buff);
 833
 834                 if (ud->side == USBIP_STUB)
 835                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 836                 else
 837                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 838
 839                 return -EPIPE;
 840         }
 841
 842         for (i = 0; i < np; i++) {
 843                 iso = buff + (i * sizeof(*iso));
 844
 845                 usbip_iso_pakcet_correct_endian(iso, 0);
 846                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 847         }
 848
 849         kfree(buff);
 850
 851         return ret;
 852 }
 853 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 854
 855
 856 /* some members of urb must be substituted before. */
 857 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 858 {
 859         int ret;
 860         int size;
 861
 862         if (ud->side == USBIP_STUB) {
 863                 /* stub_rx.c */
 864                 /* the direction of urb must be OUT. */
 865                 if (usb_pipein(urb->pipe))
 866                         return 0;
 867
 868                 size = urb->transfer_buffer_length;
 869         } else {
 870                 /* vhci_rx.c */
 871                 /* the direction of urb must be IN. */
 872                 if (usb_pipeout(urb->pipe))
 873                         return 0;
 874
 875                 size = urb->actual_length;
 876         }
 877
 878         /* no need to recv xbuff */
 879         if (!(size > 0))
 880                 return 0;
 881
 882         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 883                          size, 0);
 884         if (ret != size) {
 885                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 886                 if (ud->side == USBIP_STUB) {
 887                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 888                 } else {
 889                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 890                         return -EPIPE;
 891                 }
 892         }
 893
 894         return ret;
 895 }
 896 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 897
 898
 899 /*-------------------------------------------------------------------------*/
 900
 901 static int __init usbip_common_init(void)
 902 {
 903         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
 904
 905         return 0;
 906 }
 907
 908 static void __exit usbip_common_exit(void)
 909 {
 910         return;
 911 }
 912
 913
 914
 915
 916 module_init(usbip_common_init);
 917 module_exit(usbip_common_exit);
 918
 919 MODULE_AUTHOR(DRIVER_AUTHOR);
 920 MODULE_DESCRIPTION(DRIVER_DESC);
 921 MODULE_LICENSE("GPL");