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