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 <asm/byteorder.h>
  21 #include <linux/file.h>
  22 #include <linux/fs.h>
  23 #include <linux/kernel.h>
  24 #include <linux/slab.h>
  25 #include <linux/stat.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <net/sock.h>
  29
  30 #include "usbip_common.h"
  31
  32 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
  33 #define DRIVER_DESC "USB/IP Core"
  34
  35 #ifdef CONFIG_USBIP_DEBUG
  36 unsigned long usbip_debug_flag = 0xffffffff;
  37 #else
  38 unsigned long usbip_debug_flag;
  39 #endif
  40 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  41 module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
  42 MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");
  43
  44 /* FIXME */
  45 struct device_attribute dev_attr_usbip_debug;
  46 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  47
  48 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  49                          char *buf)
  50 {
  51         return sprintf(buf, "%lx\n", usbip_debug_flag);
  52 }
  53
  54 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  55                           const char *buf, size_t count)
  56 {
  57         sscanf(buf, "%lx", &usbip_debug_flag);
  58         return count;
  59 }
  60 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  61
  62 static void usbip_dump_buffer(char *buff, int bufflen)
  63 {
  64         print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
  65                        buff, bufflen, false);
  66 }
  67
  68 static void usbip_dump_pipe(unsigned int p)
  69 {
  70         unsigned char type = usb_pipetype(p);
  71         unsigned char ep   = usb_pipeendpoint(p);
  72         unsigned char dev  = usb_pipedevice(p);
  73         unsigned char dir  = usb_pipein(p);
  74
  75         pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
  76
  77         switch (type) {
  78         case PIPE_ISOCHRONOUS:
  79                 pr_debug("ISO\n");
  80                 break;
  81         case PIPE_INTERRUPT:
  82                 pr_debug("INT\n");
  83                 break;
  84         case PIPE_CONTROL:
  85                 pr_debug("CTRL\n");
  86                 break;
  87         case PIPE_BULK:
  88                 pr_debug("BULK\n");
  89                 break;
  90         default:
  91                 pr_debug("ERR\n");
  92                 break;
  93         }
  94 }
  95
  96 static void usbip_dump_usb_device(struct usb_device *udev)
  97 {
  98         struct device *dev = &udev->dev;
  99         int i;
 100
 101         dev_dbg(dev, "       devnum(%d) devpath(%s) ",
 102                 udev->devnum, udev->devpath);
 103
 104         switch (udev->speed) {
 105         case USB_SPEED_HIGH:
 106                 pr_debug("SPD_HIGH ");
 107                 break;
 108         case USB_SPEED_FULL:
 109                 pr_debug("SPD_FULL ");
 110                 break;
 111         case USB_SPEED_LOW:
 112                 pr_debug("SPD_LOW ");
 113                 break;
 114         case USB_SPEED_UNKNOWN:
 115                 pr_debug("SPD_UNKNOWN ");
 116                 break;
 117         default:
 118                 pr_debug("SPD_ERROR ");
 119                 break;
 120         }
 121
 122         pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
 123
 124         dev_dbg(dev, "                    ");
 125         for (i = 0; i < 16; i++)
 126                 pr_debug(" %2u", i);
 127         pr_debug("\n");
 128
 129         dev_dbg(dev, "       toggle0(IN) :");
 130         for (i = 0; i < 16; i++)
 131                 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 132         pr_debug("\n");
 133
 134         dev_dbg(dev, "       toggle1(OUT):");
 135         for (i = 0; i < 16; i++)
 136                 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 137         pr_debug("\n");
 138
 139         dev_dbg(dev, "       epmaxp_in   :");
 140         for (i = 0; i < 16; i++) {
 141                 if (udev->ep_in[i])
 142                         pr_debug(" %2u",
 143                             le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 144         }
 145         pr_debug("\n");
 146
 147         dev_dbg(dev, "       epmaxp_out  :");
 148         for (i = 0; i < 16; i++) {
 149                 if (udev->ep_out[i])
 150                         pr_debug(" %2u",
 151                             le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 152         }
 153         pr_debug("\n");
 154
 155         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 156
 157         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 158                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 159                 udev->actconfig, udev->rawdescriptors);
 160
 161         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 162                 udev->have_langid, udev->string_langid);
 163
 164         dev_dbg(dev, "maxchild %d\n", udev->maxchild);
 165 }
 166
 167 static void usbip_dump_request_type(__u8 rt)
 168 {
 169         switch (rt & USB_RECIP_MASK) {
 170         case USB_RECIP_DEVICE:
 171                 pr_debug("DEVICE");
 172                 break;
 173         case USB_RECIP_INTERFACE:
 174                 pr_debug("INTERF");
 175                 break;
 176         case USB_RECIP_ENDPOINT:
 177                 pr_debug("ENDPOI");
 178                 break;
 179         case USB_RECIP_OTHER:
 180                 pr_debug("OTHER ");
 181                 break;
 182         default:
 183                 pr_debug("------");
 184                 break;
 185         }
 186 }
 187
 188 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 189 {
 190         if (!cmd) {
 191                 pr_debug("       : null pointer\n");
 192                 return;
 193         }
 194
 195         pr_debug("       ");
 196         pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
 197                  "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
 198                  cmd->wValue, cmd->wIndex, cmd->wLength);
 199         pr_debug("\n       ");
 200
 201         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 202                 pr_debug("STANDARD ");
 203                 switch (cmd->bRequest) {
 204                 case USB_REQ_GET_STATUS:
 205                         pr_debug("GET_STATUS\n");
 206                         break;
 207                 case USB_REQ_CLEAR_FEATURE:
 208                         pr_debug("CLEAR_FEAT\n");
 209                         break;
 210                 case USB_REQ_SET_FEATURE:
 211                         pr_debug("SET_FEAT\n");
 212                         break;
 213                 case USB_REQ_SET_ADDRESS:
 214                         pr_debug("SET_ADDRRS\n");
 215                         break;
 216                 case USB_REQ_GET_DESCRIPTOR:
 217                         pr_debug("GET_DESCRI\n");
 218                         break;
 219                 case USB_REQ_SET_DESCRIPTOR:
 220                         pr_debug("SET_DESCRI\n");
 221                         break;
 222                 case USB_REQ_GET_CONFIGURATION:
 223                         pr_debug("GET_CONFIG\n");
 224                         break;
 225                 case USB_REQ_SET_CONFIGURATION:
 226                         pr_debug("SET_CONFIG\n");
 227                         break;
 228                 case USB_REQ_GET_INTERFACE:
 229                         pr_debug("GET_INTERF\n");
 230                         break;
 231                 case USB_REQ_SET_INTERFACE:
 232                         pr_debug("SET_INTERF\n");
 233                         break;
 234                 case USB_REQ_SYNCH_FRAME:
 235                         pr_debug("SYNC_FRAME\n");
 236                         break;
 237                 default:
 238                         pr_debug("REQ(%02X)\n", cmd->bRequest);
 239                         break;
 240                 }
 241                 usbip_dump_request_type(cmd->bRequestType);
 242         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
 243                 pr_debug("CLASS\n");
 244         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
 245                 pr_debug("VENDOR\n");
 246         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
 247                 pr_debug("RESERVED\n");
 248         }
 249 }
 250
 251 void usbip_dump_urb(struct urb *urb)
 252 {
 253         struct device *dev;
 254
 255         if (!urb) {
 256                 pr_debug("urb: null pointer!!\n");
 257                 return;
 258         }
 259
 260         if (!urb->dev) {
 261                 pr_debug("urb->dev: null pointer!!\n");
 262                 return;
 263         }
 264
 265         dev = &urb->dev->dev;
 266
 267         dev_dbg(dev, "   urb                   :%p\n", urb);
 268         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 269
 270         usbip_dump_usb_device(urb->dev);
 271
 272         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 273
 274         usbip_dump_pipe(urb->pipe);
 275
 276         dev_dbg(dev, "   status                :%d\n", urb->status);
 277         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 278         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 279         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 280                                                 urb->transfer_buffer_length);
 281         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 282         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 283
 284         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 285                 usbip_dump_usb_ctrlrequest(
 286                         (struct usb_ctrlrequest *)urb->setup_packet);
 287
 288         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 289         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 290         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 291         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 292         dev_dbg(dev, "   context               :%p\n", urb->context);
 293         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 294 }
 295 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 296
 297 void usbip_dump_header(struct usbip_header *pdu)
 298 {
 299         pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 300                  pdu->base.command,
 301                  pdu->base.seqnum,
 302                  pdu->base.devid,
 303                  pdu->base.direction,
 304                  pdu->base.ep);
 305
 306         switch (pdu->base.command) {
 307         case USBIP_CMD_SUBMIT:
 308                 pr_debug("USBIP_CMD_SUBMIT: "
 309                          "x_flags %u x_len %u sf %u #p %d iv %d\n",
 310                          pdu->u.cmd_submit.transfer_flags,
 311                          pdu->u.cmd_submit.transfer_buffer_length,
 312                          pdu->u.cmd_submit.start_frame,
 313                          pdu->u.cmd_submit.number_of_packets,
 314                          pdu->u.cmd_submit.interval);
 315                 break;
 316         case USBIP_CMD_UNLINK:
 317                 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
 318                          pdu->u.cmd_unlink.seqnum);
 319                 break;
 320         case USBIP_RET_SUBMIT:
 321                 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
 322                          pdu->u.ret_submit.status,
 323                          pdu->u.ret_submit.actual_length,
 324                          pdu->u.ret_submit.start_frame,
 325                          pdu->u.ret_submit.number_of_packets,
 326                          pdu->u.ret_submit.error_count);
 327                 break;
 328         case USBIP_RET_UNLINK:
 329                 pr_debug("USBIP_RET_UNLINK: status %d\n",
 330                          pdu->u.ret_unlink.status);
 331                 break;
 332         default:
 333                 /* NOT REACHED */
 334                 pr_err("unknown command\n");
 335                 break;
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(usbip_dump_header);
 339
 340 /* Receive data over TCP/IP. */
 341 int usbip_recv(struct socket *sock, void *buf, int size)
 342 {
 343         int result;
 344         struct msghdr msg;
 345         struct kvec iov;
 346         int total = 0;
 347
 348         /* for blocks of if (usbip_dbg_flag_xmit) */
 349         char *bp = buf;
 350         int osize = size;
 351
 352         usbip_dbg_xmit("enter\n");
 353
 354         if (!sock || !buf || !size) {
 355                 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
 356                        size);
 357                 return -EINVAL;
 358         }
 359
 360         do {
 361                 sock->sk->sk_allocation = GFP_NOIO;
 362                 iov.iov_base    = buf;
 363                 iov.iov_len     = size;
 364                 msg.msg_name    = NULL;
 365                 msg.msg_namelen = 0;
 366                 msg.msg_control = NULL;
 367                 msg.msg_controllen = 0;
 368                 msg.msg_namelen    = 0;
 369                 msg.msg_flags      = MSG_NOSIGNAL;
 370
 371                 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
 372                 if (result <= 0) {
 373                         pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
 374                                  sock, buf, size, result, total);
 375                         goto err;
 376                 }
 377
 378                 size -= result;
 379                 buf += result;
 380                 total += result;
 381         } while (size > 0);
 382
 383         if (usbip_dbg_flag_xmit) {
 384                 if (!in_interrupt())
 385                         pr_debug("%-10s:", current->comm);
 386                 else
 387                         pr_debug("interrupt  :");
 388
 389                 pr_debug("receiving....\n");
 390                 usbip_dump_buffer(bp, osize);
 391                 pr_debug("received, osize %d ret %d size %d total %d\n",
 392                         osize, result, size, total);
 393         }
 394
 395         return total;
 396
 397 err:
 398         return result;
 399 }
 400 EXPORT_SYMBOL_GPL(usbip_recv);
 401
 402 struct socket *sockfd_to_socket(unsigned int sockfd)
 403 {
 404         struct socket *socket;
 405         struct file *file;
 406         struct inode *inode;
 407
 408         file = fget(sockfd);
 409         if (!file) {
 410                 pr_err("invalid sockfd\n");
 411                 return NULL;
 412         }
 413
 414         inode = file_inode(file);
 415
 416         if (!inode || !S_ISSOCK(inode->i_mode)) {
 417                 fput(file);
 418                 return NULL;
 419         }
 420
 421         socket = SOCKET_I(inode);
 422
 423         return socket;
 424 }
 425 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 426
 427 /* there may be more cases to tweak the flags. */
 428 static unsigned int tweak_transfer_flags(unsigned int flags)
 429 {
 430         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 431         return flags;
 432 }
 433
 434 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 435                                   int pack)
 436 {
 437         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 438
 439         /*
 440          * Some members are not still implemented in usbip. I hope this issue
 441          * will be discussed when usbip is ported to other operating systems.
 442          */
 443         if (pack) {
 444                 spdu->transfer_flags =
 445                         tweak_transfer_flags(urb->transfer_flags);
 446                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 447                 spdu->start_frame               = urb->start_frame;
 448                 spdu->number_of_packets         = urb->number_of_packets;
 449                 spdu->interval                  = urb->interval;
 450         } else  {
 451                 urb->transfer_flags         = spdu->transfer_flags;
 452                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 453                 urb->start_frame            = spdu->start_frame;
 454                 urb->number_of_packets      = spdu->number_of_packets;
 455                 urb->interval               = spdu->interval;
 456         }
 457 }
 458
 459 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 460                                   int pack)
 461 {
 462         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 463
 464         if (pack) {
 465                 rpdu->status            = urb->status;
 466                 rpdu->actual_length     = urb->actual_length;
 467                 rpdu->start_frame       = urb->start_frame;
 468                 rpdu->number_of_packets = urb->number_of_packets;
 469                 rpdu->error_count       = urb->error_count;
 470         } else {
 471                 urb->status             = rpdu->status;
 472                 urb->actual_length      = rpdu->actual_length;
 473                 urb->start_frame        = rpdu->start_frame;
 474                 urb->number_of_packets = rpdu->number_of_packets;
 475                 urb->error_count        = rpdu->error_count;
 476         }
 477 }
 478
 479 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 480                     int pack)
 481 {
 482         switch (cmd) {
 483         case USBIP_CMD_SUBMIT:
 484                 usbip_pack_cmd_submit(pdu, urb, pack);
 485                 break;
 486         case USBIP_RET_SUBMIT:
 487                 usbip_pack_ret_submit(pdu, urb, pack);
 488                 break;
 489         default:
 490                 /* NOT REACHED */
 491                 pr_err("unknown command\n");
 492                 break;
 493         }
 494 }
 495 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 496
 497 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 498 {
 499         if (send) {
 500                 base->command   = cpu_to_be32(base->command);
 501                 base->seqnum    = cpu_to_be32(base->seqnum);
 502                 base->devid     = cpu_to_be32(base->devid);
 503                 base->direction = cpu_to_be32(base->direction);
 504                 base->ep        = cpu_to_be32(base->ep);
 505         } else {
 506                 base->command   = be32_to_cpu(base->command);
 507                 base->seqnum    = be32_to_cpu(base->seqnum);
 508                 base->devid     = be32_to_cpu(base->devid);
 509                 base->direction = be32_to_cpu(base->direction);
 510                 base->ep        = be32_to_cpu(base->ep);
 511         }
 512 }
 513
 514 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 515                                       int send)
 516 {
 517         if (send) {
 518                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 519
 520                 cpu_to_be32s(&pdu->transfer_buffer_length);
 521                 cpu_to_be32s(&pdu->start_frame);
 522                 cpu_to_be32s(&pdu->number_of_packets);
 523                 cpu_to_be32s(&pdu->interval);
 524         } else {
 525                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 526
 527                 be32_to_cpus(&pdu->transfer_buffer_length);
 528                 be32_to_cpus(&pdu->start_frame);
 529                 be32_to_cpus(&pdu->number_of_packets);
 530                 be32_to_cpus(&pdu->interval);
 531         }
 532 }
 533
 534 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 535                                       int send)
 536 {
 537         if (send) {
 538                 cpu_to_be32s(&pdu->status);
 539                 cpu_to_be32s(&pdu->actual_length);
 540                 cpu_to_be32s(&pdu->start_frame);
 541                 cpu_to_be32s(&pdu->number_of_packets);
 542                 cpu_to_be32s(&pdu->error_count);
 543         } else {
 544                 be32_to_cpus(&pdu->status);
 545                 be32_to_cpus(&pdu->actual_length);
 546                 be32_to_cpus(&pdu->start_frame);
 547                 be32_to_cpus(&pdu->number_of_packets);
 548                 be32_to_cpus(&pdu->error_count);
 549         }
 550 }
 551
 552 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 553                                       int send)
 554 {
 555         if (send)
 556                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 557         else
 558                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 559 }
 560
 561 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 562                                       int send)
 563 {
 564         if (send)
 565                 cpu_to_be32s(&pdu->status);
 566         else
 567                 be32_to_cpus(&pdu->status);
 568 }
 569
 570 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 571 {
 572         __u32 cmd = 0;
 573
 574         if (send)
 575                 cmd = pdu->base.command;
 576
 577         correct_endian_basic(&pdu->base, send);
 578
 579         if (!send)
 580                 cmd = pdu->base.command;
 581
 582         switch (cmd) {
 583         case USBIP_CMD_SUBMIT:
 584                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 585                 break;
 586         case USBIP_RET_SUBMIT:
 587                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 588                 break;
 589         case USBIP_CMD_UNLINK:
 590                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 591                 break;
 592         case USBIP_RET_UNLINK:
 593                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 594                 break;
 595         default:
 596                 /* NOT REACHED */
 597                 pr_err("unknown command\n");
 598                 break;
 599         }
 600 }
 601 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 602
 603 static void usbip_iso_packet_correct_endian(
 604                 struct usbip_iso_packet_descriptor *iso, int send)
 605 {
 606         /* does not need all members. but copy all simply. */
 607         if (send) {
 608                 iso->offset     = cpu_to_be32(iso->offset);
 609                 iso->length     = cpu_to_be32(iso->length);
 610                 iso->status     = cpu_to_be32(iso->status);
 611                 iso->actual_length = cpu_to_be32(iso->actual_length);
 612         } else {
 613                 iso->offset     = be32_to_cpu(iso->offset);
 614                 iso->length     = be32_to_cpu(iso->length);
 615                 iso->status     = be32_to_cpu(iso->status);
 616                 iso->actual_length = be32_to_cpu(iso->actual_length);
 617         }
 618 }
 619
 620 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 621                            struct usb_iso_packet_descriptor *uiso, int pack)
 622 {
 623         if (pack) {
 624                 iso->offset             = uiso->offset;
 625                 iso->length             = uiso->length;
 626                 iso->status             = uiso->status;
 627                 iso->actual_length      = uiso->actual_length;
 628         } else {
 629                 uiso->offset            = iso->offset;
 630                 uiso->length            = iso->length;
 631                 uiso->status            = iso->status;
 632                 uiso->actual_length     = iso->actual_length;
 633         }
 634 }
 635
 636 /* must free buffer */
 637 struct usbip_iso_packet_descriptor*
 638 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 639 {
 640         struct usbip_iso_packet_descriptor *iso;
 641         int np = urb->number_of_packets;
 642         ssize_t size = np * sizeof(*iso);
 643         int i;
 644
 645         iso = kzalloc(size, GFP_KERNEL);
 646         if (!iso)
 647                 return NULL;
 648
 649         for (i = 0; i < np; i++) {
 650                 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1);
 651                 usbip_iso_packet_correct_endian(&iso[i], 1);
 652         }
 653
 654         *bufflen = size;
 655
 656         return iso;
 657 }
 658 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 659
 660 /* some members of urb must be substituted before. */
 661 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 662 {
 663         void *buff;
 664         struct usbip_iso_packet_descriptor *iso;
 665         int np = urb->number_of_packets;
 666         int size = np * sizeof(*iso);
 667         int i;
 668         int ret;
 669         int total_length = 0;
 670
 671         if (!usb_pipeisoc(urb->pipe))
 672                 return 0;
 673
 674         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 675         if (np == 0)
 676                 return 0;
 677
 678         buff = kzalloc(size, GFP_KERNEL);
 679         if (!buff)
 680                 return -ENOMEM;
 681
 682         ret = usbip_recv(ud->tcp_socket, buff, size);
 683         if (ret != size) {
 684                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 685                         ret);
 686                 kfree(buff);
 687
 688                 if (ud->side == USBIP_STUB)
 689                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 690                 else
 691                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 692
 693                 return -EPIPE;
 694         }
 695
 696         iso = (struct usbip_iso_packet_descriptor *) buff;
 697         for (i = 0; i < np; i++) {
 698                 usbip_iso_packet_correct_endian(&iso[i], 0);
 699                 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0);
 700                 total_length += urb->iso_frame_desc[i].actual_length;
 701         }
 702
 703         kfree(buff);
 704
 705         if (total_length != urb->actual_length) {
 706                 dev_err(&urb->dev->dev,
 707                         "total length of iso packets %d not equal to actual "
 708                         "length of buffer %d\n",
 709                         total_length, urb->actual_length);
 710
 711                 if (ud->side == USBIP_STUB)
 712                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 713                 else
 714                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 715
 716                 return -EPIPE;
 717         }
 718
 719         return ret;
 720 }
 721 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 722
 723 /*
 724  * This functions restores the padding which was removed for optimizing
 725  * the bandwidth during transfer over tcp/ip
 726  *
 727  * buffer and iso packets need to be stored and be in propeper endian in urb
 728  * before calling this function
 729  */
 730 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 731 {
 732         int np = urb->number_of_packets;
 733         int i;
 734         int actualoffset = urb->actual_length;
 735
 736         if (!usb_pipeisoc(urb->pipe))
 737                 return;
 738
 739         /* if no packets or length of data is 0, then nothing to unpack */
 740         if (np == 0 || urb->actual_length == 0)
 741                 return;
 742
 743         /*
 744          * if actual_length is transfer_buffer_length then no padding is
 745          * present.
 746          */
 747         if (urb->actual_length == urb->transfer_buffer_length)
 748                 return;
 749
 750         /*
 751          * loop over all packets from last to first (to prevent overwritting
 752          * memory when padding) and move them into the proper place
 753          */
 754         for (i = np-1; i > 0; i--) {
 755                 actualoffset -= urb->iso_frame_desc[i].actual_length;
 756                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 757                         urb->transfer_buffer + actualoffset,
 758                         urb->iso_frame_desc[i].actual_length);
 759         }
 760 }
 761 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 762
 763 /* some members of urb must be substituted before. */
 764 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 765 {
 766         int ret;
 767         int size;
 768
 769         if (ud->side == USBIP_STUB) {
 770                 /* the direction of urb must be OUT. */
 771                 if (usb_pipein(urb->pipe))
 772                         return 0;
 773
 774                 size = urb->transfer_buffer_length;
 775         } else {
 776                 /* the direction of urb must be IN. */
 777                 if (usb_pipeout(urb->pipe))
 778                         return 0;
 779
 780                 size = urb->actual_length;
 781         }
 782
 783         /* no need to recv xbuff */
 784         if (!(size > 0))
 785                 return 0;
 786
 787         ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
 788         if (ret != size) {
 789                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 790                 if (ud->side == USBIP_STUB) {
 791                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 792                 } else {
 793                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 794                         return -EPIPE;
 795                 }
 796         }
 797
 798         return ret;
 799 }
 800 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 801
 802 static int __init usbip_core_init(void)
 803 {
 804         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 805         return 0;
 806 }
 807
 808 static void __exit usbip_core_exit(void)
 809 {
 810         return;
 811 }
 812
 813 module_init(usbip_core_init);
 814 module_exit(usbip_core_exit);
 815
 816 MODULE_AUTHOR(DRIVER_AUTHOR);
 817 MODULE_DESCRIPTION(DRIVER_DESC);
 818 MODULE_LICENSE("GPL");
 819 MODULE_VERSION(USBIP_VERSION);