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/module.h>
  26 #include <net/sock.h>
  27
  28 #include "usbip_common.h"
  29
  30 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
  31 #define DRIVER_DESC "USB/IP Core"
  32
  33 #ifdef CONFIG_USBIP_DEBUG
  34 unsigned long usbip_debug_flag = 0xffffffff;
  35 #else
  36 unsigned long usbip_debug_flag;
  37 #endif
  38 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  39
  40 /* FIXME */
  41 struct device_attribute dev_attr_usbip_debug;
  42 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  43
  44 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  45                          char *buf)
  46 {
  47         return sprintf(buf, "%lx\n", usbip_debug_flag);
  48 }
  49
  50 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  51                           const char *buf, size_t count)
  52 {
  53         sscanf(buf, "%lx", &usbip_debug_flag);
  54         return count;
  55 }
  56 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  57
  58 static void usbip_dump_buffer(char *buff, int bufflen)
  59 {
  60         print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
  61                        buff, bufflen, false);
  62 }
  63
  64 static void usbip_dump_pipe(unsigned int p)
  65 {
  66         unsigned char type = usb_pipetype(p);
  67         unsigned char ep   = usb_pipeendpoint(p);
  68         unsigned char dev  = usb_pipedevice(p);
  69         unsigned char dir  = usb_pipein(p);
  70
  71         pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
  72
  73         switch (type) {
  74         case PIPE_ISOCHRONOUS:
  75                 pr_debug("ISO\n");
  76                 break;
  77         case PIPE_INTERRUPT:
  78                 pr_debug("INT\n");
  79                 break;
  80         case PIPE_CONTROL:
  81                 pr_debug("CTRL\n");
  82                 break;
  83         case PIPE_BULK:
  84                 pr_debug("BULK\n");
  85                 break;
  86         default:
  87                 pr_debug("ERR\n");
  88                 break;
  89         }
  90 }
  91
  92 static void usbip_dump_usb_device(struct usb_device *udev)
  93 {
  94         struct device *dev = &udev->dev;
  95         int i;
  96
  97         dev_dbg(dev, "       devnum(%d) devpath(%s) ",
  98                 udev->devnum, udev->devpath);
  99
 100         switch (udev->speed) {
 101         case USB_SPEED_HIGH:
 102                 pr_debug("SPD_HIGH ");
 103                 break;
 104         case USB_SPEED_FULL:
 105                 pr_debug("SPD_FULL ");
 106                 break;
 107         case USB_SPEED_LOW:
 108                 pr_debug("SPD_LOW ");
 109                 break;
 110         case USB_SPEED_UNKNOWN:
 111                 pr_debug("SPD_UNKNOWN ");
 112                 break;
 113         default:
 114                 pr_debug("SPD_ERROR ");
 115                 break;
 116         }
 117
 118         pr_debug("tt hub ttport %d\n", udev->ttport);
 119
 120         dev_dbg(dev, "                    ");
 121         for (i = 0; i < 16; i++)
 122                 pr_debug(" %2u", i);
 123         pr_debug("\n");
 124
 125         dev_dbg(dev, "       toggle0(IN) :");
 126         for (i = 0; i < 16; i++)
 127                 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 128         pr_debug("\n");
 129
 130         dev_dbg(dev, "       toggle1(OUT):");
 131         for (i = 0; i < 16; i++)
 132                 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 133         pr_debug("\n");
 134
 135         dev_dbg(dev, "       epmaxp_in   :");
 136         for (i = 0; i < 16; i++) {
 137                 if (udev->ep_in[i])
 138                         pr_debug(" %2u",
 139                             le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 140         }
 141         pr_debug("\n");
 142
 143         dev_dbg(dev, "       epmaxp_out  :");
 144         for (i = 0; i < 16; i++) {
 145                 if (udev->ep_out[i])
 146                         pr_debug(" %2u",
 147                             le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 148         }
 149         pr_debug("\n");
 150
 151         dev_dbg(dev, "parent %s, bus %s\n", dev_name(&udev->parent->dev),
 152                 udev->bus->bus_name);
 153
 154         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 155                 udev->have_langid, udev->string_langid);
 156
 157         dev_dbg(dev, "maxchild %d, children %p\n",
 158                 udev->maxchild, udev->children);
 159 }
 160
 161 static void usbip_dump_request_type(__u8 rt)
 162 {
 163         switch (rt & USB_RECIP_MASK) {
 164         case USB_RECIP_DEVICE:
 165                 pr_debug("DEVICE");
 166                 break;
 167         case USB_RECIP_INTERFACE:
 168                 pr_debug("INTERF");
 169                 break;
 170         case USB_RECIP_ENDPOINT:
 171                 pr_debug("ENDPOI");
 172                 break;
 173         case USB_RECIP_OTHER:
 174                 pr_debug("OTHER ");
 175                 break;
 176         default:
 177                 pr_debug("------");
 178                 break;
 179         }
 180 }
 181
 182 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 183 {
 184         if (!cmd) {
 185                 pr_debug("       : null pointer\n");
 186                 return;
 187         }
 188
 189         pr_debug("       ");
 190         pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
 191                  "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
 192                  cmd->wValue, cmd->wIndex, cmd->wLength);
 193         pr_debug("\n       ");
 194
 195         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 196                 pr_debug("STANDARD ");
 197                 switch (cmd->bRequest) {
 198                 case USB_REQ_GET_STATUS:
 199                         pr_debug("GET_STATUS\n");
 200                         break;
 201                 case USB_REQ_CLEAR_FEATURE:
 202                         pr_debug("CLEAR_FEAT\n");
 203                         break;
 204                 case USB_REQ_SET_FEATURE:
 205                         pr_debug("SET_FEAT\n");
 206                         break;
 207                 case USB_REQ_SET_ADDRESS:
 208                         pr_debug("SET_ADDRRS\n");
 209                         break;
 210                 case USB_REQ_GET_DESCRIPTOR:
 211                         pr_debug("GET_DESCRI\n");
 212                         break;
 213                 case USB_REQ_SET_DESCRIPTOR:
 214                         pr_debug("SET_DESCRI\n");
 215                         break;
 216                 case USB_REQ_GET_CONFIGURATION:
 217                         pr_debug("GET_CONFIG\n");
 218                         break;
 219                 case USB_REQ_SET_CONFIGURATION:
 220                         pr_debug("SET_CONFIG\n");
 221                         break;
 222                 case USB_REQ_GET_INTERFACE:
 223                         pr_debug("GET_INTERF\n");
 224                         break;
 225                 case USB_REQ_SET_INTERFACE:
 226                         pr_debug("SET_INTERF\n");
 227                         break;
 228                 case USB_REQ_SYNCH_FRAME:
 229                         pr_debug("SYNC_FRAME\n");
 230                         break;
 231                 default:
 232                         pr_debug("REQ(%02X)\n", cmd->bRequest);
 233                         break;
 234                 }
 235                 usbip_dump_request_type(cmd->bRequestType);
 236         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
 237                 pr_debug("CLASS\n");
 238         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
 239                 pr_debug("VENDOR\n");
 240         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
 241                 pr_debug("RESERVED\n");
 242         }
 243 }
 244
 245 void usbip_dump_urb(struct urb *urb)
 246 {
 247         struct device *dev;
 248
 249         if (!urb) {
 250                 pr_debug("urb: null pointer!!\n");
 251                 return;
 252         }
 253
 254         if (!urb->dev) {
 255                 pr_debug("urb->dev: null pointer!!\n");
 256                 return;
 257         }
 258
 259         dev = &urb->dev->dev;
 260
 261         usbip_dump_usb_device(urb->dev);
 262
 263         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 264
 265         usbip_dump_pipe(urb->pipe);
 266
 267         dev_dbg(dev, "   status                :%d\n", urb->status);
 268         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 269         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 270                                                 urb->transfer_buffer_length);
 271         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 272
 273         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 274                 usbip_dump_usb_ctrlrequest(
 275                         (struct usb_ctrlrequest *)urb->setup_packet);
 276
 277         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 278         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 279         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 280         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 281 }
 282 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 283
 284 void usbip_dump_header(struct usbip_header *pdu)
 285 {
 286         pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 287                  pdu->base.command,
 288                  pdu->base.seqnum,
 289                  pdu->base.devid,
 290                  pdu->base.direction,
 291                  pdu->base.ep);
 292
 293         switch (pdu->base.command) {
 294         case USBIP_CMD_SUBMIT:
 295                 pr_debug("USBIP_CMD_SUBMIT: "
 296                          "x_flags %u x_len %u sf %u #p %d iv %d\n",
 297                          pdu->u.cmd_submit.transfer_flags,
 298                          pdu->u.cmd_submit.transfer_buffer_length,
 299                          pdu->u.cmd_submit.start_frame,
 300                          pdu->u.cmd_submit.number_of_packets,
 301                          pdu->u.cmd_submit.interval);
 302                 break;
 303         case USBIP_CMD_UNLINK:
 304                 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
 305                          pdu->u.cmd_unlink.seqnum);
 306                 break;
 307         case USBIP_RET_SUBMIT:
 308                 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
 309                          pdu->u.ret_submit.status,
 310                          pdu->u.ret_submit.actual_length,
 311                          pdu->u.ret_submit.start_frame,
 312                          pdu->u.ret_submit.number_of_packets,
 313                          pdu->u.ret_submit.error_count);
 314                 break;
 315         case USBIP_RET_UNLINK:
 316                 pr_debug("USBIP_RET_UNLINK: status %d\n",
 317                          pdu->u.ret_unlink.status);
 318                 break;
 319         default:
 320                 /* NOT REACHED */
 321                 pr_err("unknown command\n");
 322                 break;
 323         }
 324 }
 325 EXPORT_SYMBOL_GPL(usbip_dump_header);
 326
 327 /* Receive data over TCP/IP. */
 328 int usbip_recv(struct socket *sock, void *buf, int size)
 329 {
 330         int result;
 331         struct msghdr msg;
 332         struct kvec iov;
 333         int total = 0;
 334
 335         /* for blocks of if (usbip_dbg_flag_xmit) */
 336         char *bp = buf;
 337         int osize = size;
 338
 339         if (!sock || !buf || !size)
 340                 return -EINVAL;
 341
 342         usbip_dbg_xmit("enter\n");
 343
 344         do {
 345                 sock->sk->sk_allocation = GFP_NOIO;
 346                 iov.iov_base    = buf;
 347                 iov.iov_len     = size;
 348                 msg.msg_name    = NULL;
 349                 msg.msg_namelen = 0;
 350                 msg.msg_control = NULL;
 351                 msg.msg_controllen = 0;
 352                 msg.msg_namelen    = 0;
 353                 msg.msg_flags      = MSG_NOSIGNAL;
 354
 355                 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
 356                 if (result <= 0)
 357                         goto err;
 358
 359                 size -= result;
 360                 buf += result;
 361                 total += result;
 362         } while (size > 0);
 363
 364         if (usbip_dbg_flag_xmit) {
 365                 if (!in_interrupt())
 366                         pr_debug("%-10s:", current->comm);
 367                 else
 368                         pr_debug("interrupt  :");
 369
 370                 pr_debug("receiving....\n");
 371                 usbip_dump_buffer(bp, osize);
 372                 pr_debug("received, osize %d ret %d size %d total %d\n",
 373                         osize, result, size, total);
 374         }
 375
 376         return total;
 377
 378 err:
 379         return result;
 380 }
 381 EXPORT_SYMBOL_GPL(usbip_recv);
 382
 383 struct socket *sockfd_to_socket(unsigned int sockfd)
 384 {
 385         struct socket *socket;
 386         struct file *file;
 387         struct inode *inode;
 388
 389         file = fget(sockfd);
 390         if (!file) {
 391                 pr_err("invalid sockfd\n");
 392                 return NULL;
 393         }
 394
 395         inode = file->f_dentry->d_inode;
 396
 397         if (!inode || !S_ISSOCK(inode->i_mode))
 398                 return NULL;
 399
 400         socket = SOCKET_I(inode);
 401
 402         return socket;
 403 }
 404 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 405
 406 /* there may be more cases to tweak the flags. */
 407 static unsigned int tweak_transfer_flags(unsigned int flags)
 408 {
 409         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 410         return flags;
 411 }
 412
 413 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 414                                   int pack)
 415 {
 416         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 417
 418         /*
 419          * Some members are not still implemented in usbip. I hope this issue
 420          * will be discussed when usbip is ported to other operating systems.
 421          */
 422         if (pack) {
 423                 /* vhci_tx.c */
 424                 spdu->transfer_flags =
 425                         tweak_transfer_flags(urb->transfer_flags);
 426                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 427                 spdu->start_frame               = urb->start_frame;
 428                 spdu->number_of_packets         = urb->number_of_packets;
 429                 spdu->interval                  = urb->interval;
 430         } else  {
 431                 /* stub_rx.c */
 432                 urb->transfer_flags         = spdu->transfer_flags;
 433
 434                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 435                 urb->start_frame            = spdu->start_frame;
 436                 urb->number_of_packets      = spdu->number_of_packets;
 437                 urb->interval               = spdu->interval;
 438         }
 439 }
 440
 441 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 442                                   int pack)
 443 {
 444         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 445
 446         if (pack) {
 447                 /* stub_tx.c */
 448
 449                 rpdu->status            = urb->status;
 450                 rpdu->actual_length     = urb->actual_length;
 451                 rpdu->start_frame       = urb->start_frame;
 452                 rpdu->number_of_packets = urb->number_of_packets;
 453                 rpdu->error_count       = urb->error_count;
 454         } else {
 455                 /* vhci_rx.c */
 456
 457                 urb->status             = rpdu->status;
 458                 urb->actual_length      = rpdu->actual_length;
 459                 urb->start_frame        = rpdu->start_frame;
 460                 urb->number_of_packets = rpdu->number_of_packets;
 461                 urb->error_count        = rpdu->error_count;
 462         }
 463 }
 464
 465 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 466                     int pack)
 467 {
 468         switch (cmd) {
 469         case USBIP_CMD_SUBMIT:
 470                 usbip_pack_cmd_submit(pdu, urb, pack);
 471                 break;
 472         case USBIP_RET_SUBMIT:
 473                 usbip_pack_ret_submit(pdu, urb, pack);
 474                 break;
 475         default:
 476                 /* NOT REACHED */
 477                 pr_err("unknown command\n");
 478                 break;
 479         }
 480 }
 481 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 482
 483 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 484 {
 485         if (send) {
 486                 base->command   = cpu_to_be32(base->command);
 487                 base->seqnum    = cpu_to_be32(base->seqnum);
 488                 base->devid     = cpu_to_be32(base->devid);
 489                 base->direction = cpu_to_be32(base->direction);
 490                 base->ep        = cpu_to_be32(base->ep);
 491         } else {
 492                 base->command   = be32_to_cpu(base->command);
 493                 base->seqnum    = be32_to_cpu(base->seqnum);
 494                 base->devid     = be32_to_cpu(base->devid);
 495                 base->direction = be32_to_cpu(base->direction);
 496                 base->ep        = be32_to_cpu(base->ep);
 497         }
 498 }
 499
 500 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 501                                       int send)
 502 {
 503         if (send) {
 504                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 505
 506                 cpu_to_be32s(&pdu->transfer_buffer_length);
 507                 cpu_to_be32s(&pdu->start_frame);
 508                 cpu_to_be32s(&pdu->number_of_packets);
 509                 cpu_to_be32s(&pdu->interval);
 510         } else {
 511                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 512
 513                 be32_to_cpus(&pdu->transfer_buffer_length);
 514                 be32_to_cpus(&pdu->start_frame);
 515                 be32_to_cpus(&pdu->number_of_packets);
 516                 be32_to_cpus(&pdu->interval);
 517         }
 518 }
 519
 520 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 521                                       int send)
 522 {
 523         if (send) {
 524                 cpu_to_be32s(&pdu->status);
 525                 cpu_to_be32s(&pdu->actual_length);
 526                 cpu_to_be32s(&pdu->start_frame);
 527                 cpu_to_be32s(&pdu->number_of_packets);
 528                 cpu_to_be32s(&pdu->error_count);
 529         } else {
 530                 be32_to_cpus(&pdu->status);
 531                 be32_to_cpus(&pdu->actual_length);
 532                 be32_to_cpus(&pdu->start_frame);
 533                 be32_to_cpus(&pdu->number_of_packets);
 534                 be32_to_cpus(&pdu->error_count);
 535         }
 536 }
 537
 538 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 539                                       int send)
 540 {
 541         if (send)
 542                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 543         else
 544                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 545 }
 546
 547 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 548                                       int send)
 549 {
 550         if (send)
 551                 cpu_to_be32s(&pdu->status);
 552         else
 553                 be32_to_cpus(&pdu->status);
 554 }
 555
 556 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 557 {
 558         __u32 cmd = 0;
 559
 560         if (send)
 561                 cmd = pdu->base.command;
 562
 563         correct_endian_basic(&pdu->base, send);
 564
 565         if (!send)
 566                 cmd = pdu->base.command;
 567
 568         switch (cmd) {
 569         case USBIP_CMD_SUBMIT:
 570                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 571                 break;
 572         case USBIP_RET_SUBMIT:
 573                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 574                 break;
 575         case USBIP_CMD_UNLINK:
 576                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 577                 break;
 578         case USBIP_RET_UNLINK:
 579                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 580                 break;
 581         default:
 582                 /* NOT REACHED */
 583                 pr_err("unknown command\n");
 584                 break;
 585         }
 586 }
 587 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 588
 589 static void usbip_iso_packet_correct_endian(
 590                 struct usbip_iso_packet_descriptor *iso, int send)
 591 {
 592         /* does not need all members. but copy all simply. */
 593         if (send) {
 594                 iso->offset     = cpu_to_be32(iso->offset);
 595                 iso->length     = cpu_to_be32(iso->length);
 596                 iso->status     = cpu_to_be32(iso->status);
 597                 iso->actual_length = cpu_to_be32(iso->actual_length);
 598         } else {
 599                 iso->offset     = be32_to_cpu(iso->offset);
 600                 iso->length     = be32_to_cpu(iso->length);
 601                 iso->status     = be32_to_cpu(iso->status);
 602                 iso->actual_length = be32_to_cpu(iso->actual_length);
 603         }
 604 }
 605
 606 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 607                            struct usb_iso_packet_descriptor *uiso, int pack)
 608 {
 609         if (pack) {
 610                 iso->offset             = uiso->offset;
 611                 iso->length             = uiso->length;
 612                 iso->status             = uiso->status;
 613                 iso->actual_length      = uiso->actual_length;
 614         } else {
 615                 uiso->offset            = iso->offset;
 616                 uiso->length            = iso->length;
 617                 uiso->status            = iso->status;
 618                 uiso->actual_length     = iso->actual_length;
 619         }
 620 }
 621
 622 /* must free buffer */
 623 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 624 {
 625         void *buff;
 626         struct usbip_iso_packet_descriptor *iso;
 627         int np = urb->number_of_packets;
 628         ssize_t size = np * sizeof(*iso);
 629         int i;
 630
 631         buff = kzalloc(size, GFP_KERNEL);
 632         if (!buff)
 633                 return NULL;
 634
 635         for (i = 0; i < np; i++) {
 636                 iso = buff + (i * sizeof(*iso));
 637
 638                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 639                 usbip_iso_packet_correct_endian(iso, 1);
 640         }
 641
 642         *bufflen = size;
 643
 644         return buff;
 645 }
 646 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 647
 648 /* some members of urb must be substituted before. */
 649 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 650 {
 651         void *buff;
 652         struct usbip_iso_packet_descriptor *iso;
 653         int np = urb->number_of_packets;
 654         int size = np * sizeof(*iso);
 655         int i;
 656         int ret;
 657         int total_length = 0;
 658
 659         if (!usb_pipeisoc(urb->pipe))
 660                 return 0;
 661
 662         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 663         if (np == 0) {
 664                 /* pr_info("iso np == 0\n"); */
 665                 /* usbip_dump_urb(urb); */
 666                 return 0;
 667         }
 668
 669         buff = kzalloc(size, GFP_KERNEL);
 670         if (!buff)
 671                 return -ENOMEM;
 672
 673         ret = usbip_recv(ud->tcp_socket, buff, size);
 674         if (ret != size) {
 675                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 676                         ret);
 677                 kfree(buff);
 678
 679                 if (ud->side == USBIP_STUB)
 680                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 681                 else
 682                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 683
 684                 return -EPIPE;
 685         }
 686
 687         for (i = 0; i < np; i++) {
 688                 iso = buff + (i * sizeof(*iso));
 689
 690                 usbip_iso_packet_correct_endian(iso, 0);
 691                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 692                 total_length += urb->iso_frame_desc[i].actual_length;
 693         }
 694
 695         kfree(buff);
 696
 697         if (total_length != urb->actual_length) {
 698                 dev_err(&urb->dev->dev,
 699                         "total length of iso packets %d not equal to actual "
 700                         "length of buffer %d\n",
 701                         total_length, urb->actual_length);
 702
 703                 if (ud->side == USBIP_STUB)
 704                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 705                 else
 706                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 707
 708                 return -EPIPE;
 709         }
 710
 711         return ret;
 712 }
 713 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 714
 715 /*
 716  * This functions restores the padding which was removed for optimizing
 717  * the bandwidth during transfer over tcp/ip
 718  *
 719  * buffer and iso packets need to be stored and be in propeper endian in urb
 720  * before calling this function
 721  */
 722 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 723 {
 724         int np = urb->number_of_packets;
 725         int i;
 726         int actualoffset = urb->actual_length;
 727
 728         if (!usb_pipeisoc(urb->pipe))
 729                 return;
 730
 731         /* if no packets or length of data is 0, then nothing to unpack */
 732         if (np == 0 || urb->actual_length == 0)
 733                 return;
 734
 735         /*
 736          * if actual_length is transfer_buffer_length then no padding is
 737          * present.
 738         */
 739         if (urb->actual_length == urb->transfer_buffer_length)
 740                 return;
 741
 742         /*
 743          * loop over all packets from last to first (to prevent overwritting
 744          * memory when padding) and move them into the proper place
 745          */
 746         for (i = np-1; i > 0; i--) {
 747                 actualoffset -= urb->iso_frame_desc[i].actual_length;
 748                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 749                         urb->transfer_buffer + actualoffset,
 750                         urb->iso_frame_desc[i].actual_length);
 751         }
 752 }
 753 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 754
 755 /* some members of urb must be substituted before. */
 756 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 757 {
 758         int ret;
 759         int size;
 760
 761         if (ud->side == USBIP_STUB) {
 762                 /* stub_rx.c */
 763                 /* the direction of urb must be OUT. */
 764                 if (usb_pipein(urb->pipe))
 765                         return 0;
 766
 767                 size = urb->transfer_buffer_length;
 768         } else {
 769                 /* vhci_rx.c */
 770                 /* the direction of urb must be IN. */
 771                 if (usb_pipeout(urb->pipe))
 772                         return 0;
 773
 774                 size = urb->actual_length;
 775         }
 776
 777         /* no need to recv xbuff */
 778         if (!(size > 0))
 779                 return 0;
 780
 781         if (size > urb->transfer_buffer_length) {
 782                 /* should not happen, probably malicious packet */
 783                 if (ud->side == USBIP_STUB) {
 784                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 785                         return 0;
 786                 } else {
 787                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 788                         return -EPIPE;
 789                 }
 790         }
 791
 792         ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
 793         if (ret != size) {
 794                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 795                 if (ud->side == USBIP_STUB) {
 796                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 797                 } else {
 798                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 799                         return -EPIPE;
 800                 }
 801         }
 802
 803         return ret;
 804 }
 805 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 806
 807 static int __init usbip_core_init(void)
 808 {
 809         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 810         return 0;
 811 }
 812
 813 static void __exit usbip_core_exit(void)
 814 {
 815         return;
 816 }
 817
 818 module_init(usbip_core_init);
 819 module_exit(usbip_core_exit);
 820
 821 MODULE_AUTHOR(DRIVER_AUTHOR);
 822 MODULE_DESCRIPTION(DRIVER_DESC);
 823 MODULE_LICENSE("GPL");
 824 MODULE_VERSION(USBIP_VERSION);