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