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