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 %p, ttport %d\n", udev->tt, 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 %p, bus %p\n", udev->parent, udev->bus);
 152
 153         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 154                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 155                 udev->actconfig, udev->rawdescriptors);
 156
 157         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 158                 udev->have_langid, udev->string_langid);
 159
 160         dev_dbg(dev, "maxchild %d, children %p\n",
 161                 udev->maxchild, udev->children);
 162 }
 163
 164 static void usbip_dump_request_type(__u8 rt)
 165 {
 166         switch (rt & USB_RECIP_MASK) {
 167         case USB_RECIP_DEVICE:
 168                 pr_debug("DEVICE");
 169                 break;
 170         case USB_RECIP_INTERFACE:
 171                 pr_debug("INTERF");
 172                 break;
 173         case USB_RECIP_ENDPOINT:
 174                 pr_debug("ENDPOI");
 175                 break;
 176         case USB_RECIP_OTHER:
 177                 pr_debug("OTHER ");
 178                 break;
 179         default:
 180                 pr_debug("------");
 181                 break;
 182         }
 183 }
 184
 185 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 186 {
 187         if (!cmd) {
 188                 pr_debug("       : null pointer\n");
 189                 return;
 190         }
 191
 192         pr_debug("       ");
 193         pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
 194                  "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
 195                  cmd->wValue, cmd->wIndex, cmd->wLength);
 196         pr_debug("\n       ");
 197
 198         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 199                 pr_debug("STANDARD ");
 200                 switch (cmd->bRequest) {
 201                 case USB_REQ_GET_STATUS:
 202                         pr_debug("GET_STATUS\n");
 203                         break;
 204                 case USB_REQ_CLEAR_FEATURE:
 205                         pr_debug("CLEAR_FEAT\n");
 206                         break;
 207                 case USB_REQ_SET_FEATURE:
 208                         pr_debug("SET_FEAT\n");
 209                         break;
 210                 case USB_REQ_SET_ADDRESS:
 211                         pr_debug("SET_ADDRRS\n");
 212                         break;
 213                 case USB_REQ_GET_DESCRIPTOR:
 214                         pr_debug("GET_DESCRI\n");
 215                         break;
 216                 case USB_REQ_SET_DESCRIPTOR:
 217                         pr_debug("SET_DESCRI\n");
 218                         break;
 219                 case USB_REQ_GET_CONFIGURATION:
 220                         pr_debug("GET_CONFIG\n");
 221                         break;
 222                 case USB_REQ_SET_CONFIGURATION:
 223                         pr_debug("SET_CONFIG\n");
 224                         break;
 225                 case USB_REQ_GET_INTERFACE:
 226                         pr_debug("GET_INTERF\n");
 227                         break;
 228                 case USB_REQ_SET_INTERFACE:
 229                         pr_debug("SET_INTERF\n");
 230                         break;
 231                 case USB_REQ_SYNCH_FRAME:
 232                         pr_debug("SYNC_FRAME\n");
 233                         break;
 234                 default:
 235                         pr_debug("REQ(%02X)\n", cmd->bRequest);
 236                         break;
 237                 }
 238                 usbip_dump_request_type(cmd->bRequestType);
 239         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
 240                 pr_debug("CLASS\n");
 241         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
 242                 pr_debug("VENDOR\n");
 243         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
 244                 pr_debug("RESERVED\n");
 245         }
 246 }
 247
 248 void usbip_dump_urb(struct urb *urb)
 249 {
 250         struct device *dev;
 251
 252         if (!urb) {
 253                 pr_debug("urb: null pointer!!\n");
 254                 return;
 255         }
 256
 257         if (!urb->dev) {
 258                 pr_debug("urb->dev: null pointer!!\n");
 259                 return;
 260         }
 261
 262         dev = &urb->dev->dev;
 263
 264         dev_dbg(dev, "   urb                   :%p\n", urb);
 265         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 266
 267         usbip_dump_usb_device(urb->dev);
 268
 269         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 270
 271         usbip_dump_pipe(urb->pipe);
 272
 273         dev_dbg(dev, "   status                :%d\n", urb->status);
 274         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 275         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 276         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 277                                                 urb->transfer_buffer_length);
 278         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 279         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 280
 281         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 282                 usbip_dump_usb_ctrlrequest(
 283                         (struct usb_ctrlrequest *)urb->setup_packet);
 284
 285         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 286         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 287         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 288         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 289         dev_dbg(dev, "   context               :%p\n", urb->context);
 290         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 291 }
 292 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 293
 294 void usbip_dump_header(struct usbip_header *pdu)
 295 {
 296         pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 297                  pdu->base.command,
 298                  pdu->base.seqnum,
 299                  pdu->base.devid,
 300                  pdu->base.direction,
 301                  pdu->base.ep);
 302
 303         switch (pdu->base.command) {
 304         case USBIP_CMD_SUBMIT:
 305                 pr_debug("USBIP_CMD_SUBMIT: "
 306                          "x_flags %u x_len %u sf %u #p %d iv %d\n",
 307                          pdu->u.cmd_submit.transfer_flags,
 308                          pdu->u.cmd_submit.transfer_buffer_length,
 309                          pdu->u.cmd_submit.start_frame,
 310                          pdu->u.cmd_submit.number_of_packets,
 311                          pdu->u.cmd_submit.interval);
 312                 break;
 313         case USBIP_CMD_UNLINK:
 314                 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
 315                          pdu->u.cmd_unlink.seqnum);
 316                 break;
 317         case USBIP_RET_SUBMIT:
 318                 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
 319                          pdu->u.ret_submit.status,
 320                          pdu->u.ret_submit.actual_length,
 321                          pdu->u.ret_submit.start_frame,
 322                          pdu->u.ret_submit.number_of_packets,
 323                          pdu->u.ret_submit.error_count);
 324                 break;
 325         case USBIP_RET_UNLINK:
 326                 pr_debug("USBIP_RET_UNLINK: status %d\n",
 327                          pdu->u.ret_unlink.status);
 328                 break;
 329         default:
 330                 /* NOT REACHED */
 331                 pr_err("unknown command\n");
 332                 break;
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(usbip_dump_header);
 336
 337 /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 338 int usbip_xmit(int send, struct socket *sock, char *buf, int size,
 339                int msg_flags)
 340 {
 341         int result;
 342         struct msghdr msg;
 343         struct kvec iov;
 344         int total = 0;
 345
 346         /* for blocks of if (usbip_dbg_flag_xmit) */
 347         char *bp = buf;
 348         int osize = size;
 349
 350         usbip_dbg_xmit("enter\n");
 351
 352         if (!sock || !buf || !size) {
 353                 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
 354                        size);
 355                 return -EINVAL;
 356         }
 357
 358         if (usbip_dbg_flag_xmit) {
 359                 if (send) {
 360                         if (!in_interrupt())
 361                                 pr_debug("%-10s:", current->comm);
 362                         else
 363                                 pr_debug("interrupt  :");
 364
 365                         pr_debug("sending... , sock %p, buf %p, size %d, "
 366                                  "msg_flags %d\n", sock, buf, size, msg_flags);
 367                         usbip_dump_buffer(buf, size);
 368                 }
 369         }
 370
 371         do {
 372                 sock->sk->sk_allocation = GFP_NOIO;
 373                 iov.iov_base    = buf;
 374                 iov.iov_len     = size;
 375                 msg.msg_name    = NULL;
 376                 msg.msg_namelen = 0;
 377                 msg.msg_control = NULL;
 378                 msg.msg_controllen = 0;
 379                 msg.msg_namelen    = 0;
 380                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 381
 382                 if (send)
 383                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 384                 else
 385                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 386                                                 MSG_WAITALL);
 387
 388                 if (result <= 0) {
 389                         pr_debug("%s sock %p buf %p size %u ret %d total %d\n",
 390                                  send ? "send" : "receive", sock, buf, size,
 391                                  result, total);
 392                         goto err;
 393                 }
 394
 395                 size -= result;
 396                 buf += result;
 397                 total += result;
 398
 399         } while (size > 0);
 400
 401         if (usbip_dbg_flag_xmit) {
 402                 if (!send) {
 403                         if (!in_interrupt())
 404                                 pr_debug("%-10s:", current->comm);
 405                         else
 406                                 pr_debug("interrupt  :");
 407
 408                         pr_debug("receiving....\n");
 409                         usbip_dump_buffer(bp, osize);
 410                         pr_debug("received, osize %d ret %d size %d total %d\n",
 411                                  osize, result, size, total);
 412                 }
 413
 414                 if (send)
 415                         pr_debug("send, total %d\n", total);
 416         }
 417
 418         return total;
 419
 420 err:
 421         return result;
 422 }
 423 EXPORT_SYMBOL_GPL(usbip_xmit);
 424
 425 struct socket *sockfd_to_socket(unsigned int sockfd)
 426 {
 427         struct socket *socket;
 428         struct file *file;
 429         struct inode *inode;
 430
 431         file = fget(sockfd);
 432         if (!file) {
 433                 pr_err("invalid sockfd\n");
 434                 return NULL;
 435         }
 436
 437         inode = file->f_dentry->d_inode;
 438
 439         if (!inode || !S_ISSOCK(inode->i_mode))
 440                 return NULL;
 441
 442         socket = SOCKET_I(inode);
 443
 444         return socket;
 445 }
 446 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 447
 448 /* there may be more cases to tweak the flags. */
 449 static unsigned int tweak_transfer_flags(unsigned int flags)
 450 {
 451         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 452         return flags;
 453 }
 454
 455 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 456                                   int pack)
 457 {
 458         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 459
 460         /*
 461          * Some members are not still implemented in usbip. I hope this issue
 462          * will be discussed when usbip is ported to other operating systems.
 463          */
 464         if (pack) {
 465                 /* vhci_tx.c */
 466                 spdu->transfer_flags =
 467                         tweak_transfer_flags(urb->transfer_flags);
 468                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 469                 spdu->start_frame               = urb->start_frame;
 470                 spdu->number_of_packets         = urb->number_of_packets;
 471                 spdu->interval                  = urb->interval;
 472         } else  {
 473                 /* stub_rx.c */
 474                 urb->transfer_flags         = spdu->transfer_flags;
 475
 476                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 477                 urb->start_frame            = spdu->start_frame;
 478                 urb->number_of_packets      = spdu->number_of_packets;
 479                 urb->interval               = spdu->interval;
 480         }
 481 }
 482
 483 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 484                                   int pack)
 485 {
 486         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 487
 488         if (pack) {
 489                 /* stub_tx.c */
 490
 491                 rpdu->status            = urb->status;
 492                 rpdu->actual_length     = urb->actual_length;
 493                 rpdu->start_frame       = urb->start_frame;
 494                 rpdu->number_of_packets = urb->number_of_packets;
 495                 rpdu->error_count       = urb->error_count;
 496         } else {
 497                 /* vhci_rx.c */
 498
 499                 urb->status             = rpdu->status;
 500                 urb->actual_length      = rpdu->actual_length;
 501                 urb->start_frame        = rpdu->start_frame;
 502                 urb->number_of_packets = rpdu->number_of_packets;
 503                 urb->error_count        = rpdu->error_count;
 504         }
 505 }
 506
 507 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 508                     int pack)
 509 {
 510         switch (cmd) {
 511         case USBIP_CMD_SUBMIT:
 512                 usbip_pack_cmd_submit(pdu, urb, pack);
 513                 break;
 514         case USBIP_RET_SUBMIT:
 515                 usbip_pack_ret_submit(pdu, urb, pack);
 516                 break;
 517         default:
 518                 /* NOT REACHED */
 519                 pr_err("unknown command\n");
 520                 break;
 521         }
 522 }
 523 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 524
 525 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 526 {
 527         if (send) {
 528                 base->command   = cpu_to_be32(base->command);
 529                 base->seqnum    = cpu_to_be32(base->seqnum);
 530                 base->devid     = cpu_to_be32(base->devid);
 531                 base->direction = cpu_to_be32(base->direction);
 532                 base->ep        = cpu_to_be32(base->ep);
 533         } else {
 534                 base->command   = be32_to_cpu(base->command);
 535                 base->seqnum    = be32_to_cpu(base->seqnum);
 536                 base->devid     = be32_to_cpu(base->devid);
 537                 base->direction = be32_to_cpu(base->direction);
 538                 base->ep        = be32_to_cpu(base->ep);
 539         }
 540 }
 541
 542 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 543                                       int send)
 544 {
 545         if (send) {
 546                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 547
 548                 cpu_to_be32s(&pdu->transfer_buffer_length);
 549                 cpu_to_be32s(&pdu->start_frame);
 550                 cpu_to_be32s(&pdu->number_of_packets);
 551                 cpu_to_be32s(&pdu->interval);
 552         } else {
 553                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 554
 555                 be32_to_cpus(&pdu->transfer_buffer_length);
 556                 be32_to_cpus(&pdu->start_frame);
 557                 be32_to_cpus(&pdu->number_of_packets);
 558                 be32_to_cpus(&pdu->interval);
 559         }
 560 }
 561
 562 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 563                                       int send)
 564 {
 565         if (send) {
 566                 cpu_to_be32s(&pdu->status);
 567                 cpu_to_be32s(&pdu->actual_length);
 568                 cpu_to_be32s(&pdu->start_frame);
 569                 cpu_to_be32s(&pdu->number_of_packets);
 570                 cpu_to_be32s(&pdu->error_count);
 571         } else {
 572                 be32_to_cpus(&pdu->status);
 573                 be32_to_cpus(&pdu->actual_length);
 574                 be32_to_cpus(&pdu->start_frame);
 575                 be32_to_cpus(&pdu->number_of_packets);
 576                 be32_to_cpus(&pdu->error_count);
 577         }
 578 }
 579
 580 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 581                                       int send)
 582 {
 583         if (send)
 584                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 585         else
 586                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 587 }
 588
 589 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 590                                       int send)
 591 {
 592         if (send)
 593                 cpu_to_be32s(&pdu->status);
 594         else
 595                 be32_to_cpus(&pdu->status);
 596 }
 597
 598 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 599 {
 600         __u32 cmd = 0;
 601
 602         if (send)
 603                 cmd = pdu->base.command;
 604
 605         correct_endian_basic(&pdu->base, send);
 606
 607         if (!send)
 608                 cmd = pdu->base.command;
 609
 610         switch (cmd) {
 611         case USBIP_CMD_SUBMIT:
 612                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 613                 break;
 614         case USBIP_RET_SUBMIT:
 615                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 616                 break;
 617         case USBIP_CMD_UNLINK:
 618                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 619                 break;
 620         case USBIP_RET_UNLINK:
 621                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 622                 break;
 623         default:
 624                 /* NOT REACHED */
 625                 pr_err("unknown command\n");
 626                 break;
 627         }
 628 }
 629 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 630
 631 static void usbip_iso_packet_correct_endian(
 632                 struct usbip_iso_packet_descriptor *iso, int send)
 633 {
 634         /* does not need all members. but copy all simply. */
 635         if (send) {
 636                 iso->offset     = cpu_to_be32(iso->offset);
 637                 iso->length     = cpu_to_be32(iso->length);
 638                 iso->status     = cpu_to_be32(iso->status);
 639                 iso->actual_length = cpu_to_be32(iso->actual_length);
 640         } else {
 641                 iso->offset     = be32_to_cpu(iso->offset);
 642                 iso->length     = be32_to_cpu(iso->length);
 643                 iso->status     = be32_to_cpu(iso->status);
 644                 iso->actual_length = be32_to_cpu(iso->actual_length);
 645         }
 646 }
 647
 648 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 649                            struct usb_iso_packet_descriptor *uiso, int pack)
 650 {
 651         if (pack) {
 652                 iso->offset             = uiso->offset;
 653                 iso->length             = uiso->length;
 654                 iso->status             = uiso->status;
 655                 iso->actual_length      = uiso->actual_length;
 656         } else {
 657                 uiso->offset            = iso->offset;
 658                 uiso->length            = iso->length;
 659                 uiso->status            = iso->status;
 660                 uiso->actual_length     = iso->actual_length;
 661         }
 662 }
 663
 664 /* must free buffer */
 665 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 666 {
 667         void *buff;
 668         struct usbip_iso_packet_descriptor *iso;
 669         int np = urb->number_of_packets;
 670         ssize_t size = np * sizeof(*iso);
 671         int i;
 672
 673         buff = kzalloc(size, GFP_KERNEL);
 674         if (!buff)
 675                 return NULL;
 676
 677         for (i = 0; i < np; i++) {
 678                 iso = buff + (i * sizeof(*iso));
 679
 680                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 681                 usbip_iso_packet_correct_endian(iso, 1);
 682         }
 683
 684         *bufflen = size;
 685
 686         return buff;
 687 }
 688 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 689
 690 /* some members of urb must be substituted before. */
 691 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 692 {
 693         void *buff;
 694         struct usbip_iso_packet_descriptor *iso;
 695         int np = urb->number_of_packets;
 696         int size = np * sizeof(*iso);
 697         int i;
 698         int ret;
 699         int total_length = 0;
 700
 701         if (!usb_pipeisoc(urb->pipe))
 702                 return 0;
 703
 704         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 705         if (np == 0) {
 706                 /* pr_info("iso np == 0\n"); */
 707                 /* usbip_dump_urb(urb); */
 708                 return 0;
 709         }
 710
 711         buff = kzalloc(size, GFP_KERNEL);
 712         if (!buff)
 713                 return -ENOMEM;
 714
 715         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 716         if (ret != size) {
 717                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 718                         ret);
 719                 kfree(buff);
 720
 721                 if (ud->side == USBIP_STUB)
 722                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 723                 else
 724                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 725
 726                 return -EPIPE;
 727         }
 728
 729         for (i = 0; i < np; i++) {
 730                 iso = buff + (i * sizeof(*iso));
 731
 732                 usbip_iso_packet_correct_endian(iso, 0);
 733                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 734                 total_length += urb->iso_frame_desc[i].actual_length;
 735         }
 736
 737         kfree(buff);
 738
 739         if (total_length != urb->actual_length) {
 740                 dev_err(&urb->dev->dev,
 741                         "total length of iso packets %d not equal to actual "
 742                         "length of buffer %d\n",
 743                         total_length, urb->actual_length);
 744
 745                 if (ud->side == USBIP_STUB)
 746                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 747                 else
 748                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 749
 750                 return -EPIPE;
 751         }
 752
 753         return ret;
 754 }
 755 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 756
 757 /*
 758  * This functions restores the padding which was removed for optimizing
 759  * the bandwidth during transfer over tcp/ip
 760  *
 761  * buffer and iso packets need to be stored and be in propeper endian in urb
 762  * before calling this function
 763  */
 764 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 765 {
 766         int np = urb->number_of_packets;
 767         int i;
 768         int actualoffset = urb->actual_length;
 769
 770         if (!usb_pipeisoc(urb->pipe))
 771                 return;
 772
 773         /* if no packets or length of data is 0, then nothing to unpack */
 774         if (np == 0 || urb->actual_length == 0)
 775                 return;
 776
 777         /*
 778          * if actual_length is transfer_buffer_length then no padding is
 779          * present.
 780         */
 781         if (urb->actual_length == urb->transfer_buffer_length)
 782                 return;
 783
 784         /*
 785          * loop over all packets from last to first (to prevent overwritting
 786          * memory when padding) and move them into the proper place
 787          */
 788         for (i = np-1; i > 0; i--) {
 789                 actualoffset -= urb->iso_frame_desc[i].actual_length;
 790                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 791                         urb->transfer_buffer + actualoffset,
 792                         urb->iso_frame_desc[i].actual_length);
 793         }
 794 }
 795 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 796
 797 /* some members of urb must be substituted before. */
 798 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 799 {
 800         int ret;
 801         int size;
 802
 803         if (ud->side == USBIP_STUB) {
 804                 /* stub_rx.c */
 805                 /* the direction of urb must be OUT. */
 806                 if (usb_pipein(urb->pipe))
 807                         return 0;
 808
 809                 size = urb->transfer_buffer_length;
 810         } else {
 811                 /* vhci_rx.c */
 812                 /* the direction of urb must be IN. */
 813                 if (usb_pipeout(urb->pipe))
 814                         return 0;
 815
 816                 size = urb->actual_length;
 817         }
 818
 819         /* no need to recv xbuff */
 820         if (!(size > 0))
 821                 return 0;
 822
 823         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 824                          size, 0);
 825         if (ret != size) {
 826                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 827                 if (ud->side == USBIP_STUB) {
 828                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 829                 } else {
 830                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 831                         return -EPIPE;
 832                 }
 833         }
 834
 835         return ret;
 836 }
 837 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 838
 839 static int __init usbip_core_init(void)
 840 {
 841         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 842         return 0;
 843 }
 844
 845 static void __exit usbip_core_exit(void)
 846 {
 847         return;
 848 }
 849
 850 module_init(usbip_core_init);
 851 module_exit(usbip_core_exit);
 852
 853 MODULE_AUTHOR(DRIVER_AUTHOR);
 854 MODULE_DESCRIPTION(DRIVER_DESC);
 855 MODULE_LICENSE("GPL");
 856 MODULE_VERSION(USBIP_VERSION);