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 <net/sock.h>
  26
  27 #include "usbip_common.h"
  28
  29 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
  30 #define DRIVER_DESC "USB/IP Core"
  31
  32 #ifdef CONFIG_USBIP_DEBUG
  33 unsigned long usbip_debug_flag = 0xffffffff;
  34 #else
  35 unsigned long usbip_debug_flag;
  36 #endif
  37 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  38
  39 /* FIXME */
  40 struct device_attribute dev_attr_usbip_debug;
  41 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  42
  43 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  44                          char *buf)
  45 {
  46         return sprintf(buf, "%lx\n", usbip_debug_flag);
  47 }
  48
  49 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  50                           const char *buf, size_t count)
  51 {
  52         sscanf(buf, "%lx", &usbip_debug_flag);
  53         return count;
  54 }
  55 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  56
  57 static void usbip_dump_buffer(char *buff, int bufflen)
  58 {
  59         print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
  60                        buff, bufflen, false);
  61 }
  62
  63 static void usbip_dump_pipe(unsigned int p)
  64 {
  65         unsigned char type = usb_pipetype(p);
  66         unsigned char ep   = usb_pipeendpoint(p);
  67         unsigned char dev  = usb_pipedevice(p);
  68         unsigned char dir  = usb_pipein(p);
  69
  70         pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
  71
  72         switch (type) {
  73         case PIPE_ISOCHRONOUS:
  74                 pr_debug("ISO\n");
  75                 break;
  76         case PIPE_INTERRUPT:
  77                 pr_debug("INT\n");
  78                 break;
  79         case PIPE_CONTROL:
  80                 pr_debug("CTRL\n");
  81                 break;
  82         case PIPE_BULK:
  83                 pr_debug("BULK\n");
  84                 break;
  85         default:
  86                 pr_debug("ERR\n");
  87                 break;
  88         }
  89 }
  90
  91 static void usbip_dump_usb_device(struct usb_device *udev)
  92 {
  93         struct device *dev = &udev->dev;
  94         int i;
  95
  96         dev_dbg(dev, "       devnum(%d) devpath(%s) ",
  97                 udev->devnum, udev->devpath);
  98
  99         switch (udev->speed) {
 100         case USB_SPEED_HIGH:
 101                 pr_debug("SPD_HIGH ");
 102                 break;
 103         case USB_SPEED_FULL:
 104                 pr_debug("SPD_FULL ");
 105                 break;
 106         case USB_SPEED_LOW:
 107                 pr_debug("SPD_LOW ");
 108                 break;
 109         case USB_SPEED_UNKNOWN:
 110                 pr_debug("SPD_UNKNOWN ");
 111                 break;
 112         default:
 113                 pr_debug("SPD_ERROR ");
 114                 break;
 115         }
 116
 117         pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
 118
 119         dev_dbg(dev, "                    ");
 120         for (i = 0; i < 16; i++)
 121                 pr_debug(" %2u", i);
 122         pr_debug("\n");
 123
 124         dev_dbg(dev, "       toggle0(IN) :");
 125         for (i = 0; i < 16; i++)
 126                 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 127         pr_debug("\n");
 128
 129         dev_dbg(dev, "       toggle1(OUT):");
 130         for (i = 0; i < 16; i++)
 131                 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 132         pr_debug("\n");
 133
 134         dev_dbg(dev, "       epmaxp_in   :");
 135         for (i = 0; i < 16; i++) {
 136                 if (udev->ep_in[i])
 137                         pr_debug(" %2u",
 138                             le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 139         }
 140         pr_debug("\n");
 141
 142         dev_dbg(dev, "       epmaxp_out  :");
 143         for (i = 0; i < 16; i++) {
 144                 if (udev->ep_out[i])
 145                         pr_debug(" %2u",
 146                             le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 147         }
 148         pr_debug("\n");
 149
 150         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 151
 152         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 153                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 154                 udev->actconfig, udev->rawdescriptors);
 155
 156         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 157                 udev->have_langid, udev->string_langid);
 158
 159         dev_dbg(dev, "maxchild %d, children %p\n",
 160                 udev->maxchild, udev->children);
 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 /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 337 int usbip_xmit(int send, struct socket *sock, char *buf, int size,
 338                int msg_flags)
 339 {
 340         int result;
 341         struct msghdr msg;
 342         struct kvec iov;
 343         int total = 0;
 344
 345         /* for blocks of if (usbip_dbg_flag_xmit) */
 346         char *bp = buf;
 347         int osize = size;
 348
 349         usbip_dbg_xmit("enter\n");
 350
 351         if (!sock || !buf || !size) {
 352                 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
 353                        size);
 354                 return -EINVAL;
 355         }
 356
 357         if (usbip_dbg_flag_xmit) {
 358                 if (send) {
 359                         if (!in_interrupt())
 360                                 pr_debug("%-10s:", current->comm);
 361                         else
 362                                 pr_debug("interrupt  :");
 363
 364                         pr_debug("sending... , sock %p, buf %p, size %d, "
 365                                  "msg_flags %d\n", sock, buf, size, msg_flags);
 366                         usbip_dump_buffer(buf, size);
 367                 }
 368         }
 369
 370         do {
 371                 sock->sk->sk_allocation = GFP_NOIO;
 372                 iov.iov_base    = buf;
 373                 iov.iov_len     = size;
 374                 msg.msg_name    = NULL;
 375                 msg.msg_namelen = 0;
 376                 msg.msg_control = NULL;
 377                 msg.msg_controllen = 0;
 378                 msg.msg_namelen    = 0;
 379                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 380
 381                 if (send)
 382                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 383                 else
 384                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 385                                                 MSG_WAITALL);
 386
 387                 if (result <= 0) {
 388                         pr_debug("%s sock %p buf %p size %u ret %d total %d\n",
 389                                  send ? "send" : "receive", sock, buf, size,
 390                                  result, total);
 391                         goto err;
 392                 }
 393
 394                 size -= result;
 395                 buf += result;
 396                 total += result;
 397
 398         } while (size > 0);
 399
 400         if (usbip_dbg_flag_xmit) {
 401                 if (!send) {
 402                         if (!in_interrupt())
 403                                 pr_debug("%-10s:", current->comm);
 404                         else
 405                                 pr_debug("interrupt  :");
 406
 407                         pr_debug("receiving....\n");
 408                         usbip_dump_buffer(bp, osize);
 409                         pr_debug("received, osize %d ret %d size %d total %d\n",
 410                                  osize, result, size, total);
 411                 }
 412
 413                 if (send)
 414                         pr_debug("send, total %d\n", total);
 415         }
 416
 417         return total;
 418
 419 err:
 420         return result;
 421 }
 422 EXPORT_SYMBOL_GPL(usbip_xmit);
 423
 424 struct socket *sockfd_to_socket(unsigned int sockfd)
 425 {
 426         struct socket *socket;
 427         struct file *file;
 428         struct inode *inode;
 429
 430         file = fget(sockfd);
 431         if (!file) {
 432                 pr_err("invalid sockfd\n");
 433                 return NULL;
 434         }
 435
 436         inode = file->f_dentry->d_inode;
 437
 438         if (!inode || !S_ISSOCK(inode->i_mode))
 439                 return NULL;
 440
 441         socket = SOCKET_I(inode);
 442
 443         return socket;
 444 }
 445 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 446
 447 /* there may be more cases to tweak the flags. */
 448 static unsigned int tweak_transfer_flags(unsigned int flags)
 449 {
 450         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 451         return flags;
 452 }
 453
 454 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 455                                   int pack)
 456 {
 457         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 458
 459         /*
 460          * Some members are not still implemented in usbip. I hope this issue
 461          * will be discussed when usbip is ported to other operating systems.
 462          */
 463         if (pack) {
 464                 /* vhci_tx.c */
 465                 spdu->transfer_flags =
 466                         tweak_transfer_flags(urb->transfer_flags);
 467                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 468                 spdu->start_frame               = urb->start_frame;
 469                 spdu->number_of_packets         = urb->number_of_packets;
 470                 spdu->interval                  = urb->interval;
 471         } else  {
 472                 /* stub_rx.c */
 473                 urb->transfer_flags         = spdu->transfer_flags;
 474
 475                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 476                 urb->start_frame            = spdu->start_frame;
 477                 urb->number_of_packets      = spdu->number_of_packets;
 478                 urb->interval               = spdu->interval;
 479         }
 480 }
 481
 482 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 483                                   int pack)
 484 {
 485         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 486
 487         if (pack) {
 488                 /* stub_tx.c */
 489
 490                 rpdu->status            = urb->status;
 491                 rpdu->actual_length     = urb->actual_length;
 492                 rpdu->start_frame       = urb->start_frame;
 493                 rpdu->number_of_packets = urb->number_of_packets;
 494                 rpdu->error_count       = urb->error_count;
 495         } else {
 496                 /* vhci_rx.c */
 497
 498                 urb->status             = rpdu->status;
 499                 urb->actual_length      = rpdu->actual_length;
 500                 urb->start_frame        = rpdu->start_frame;
 501                 urb->number_of_packets = rpdu->number_of_packets;
 502                 urb->error_count        = rpdu->error_count;
 503         }
 504 }
 505
 506 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 507                     int pack)
 508 {
 509         switch (cmd) {
 510         case USBIP_CMD_SUBMIT:
 511                 usbip_pack_cmd_submit(pdu, urb, pack);
 512                 break;
 513         case USBIP_RET_SUBMIT:
 514                 usbip_pack_ret_submit(pdu, urb, pack);
 515                 break;
 516         default:
 517                 /* NOT REACHED */
 518                 pr_err("unknown command\n");
 519                 break;
 520         }
 521 }
 522 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 523
 524 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 525 {
 526         if (send) {
 527                 base->command   = cpu_to_be32(base->command);
 528                 base->seqnum    = cpu_to_be32(base->seqnum);
 529                 base->devid     = cpu_to_be32(base->devid);
 530                 base->direction = cpu_to_be32(base->direction);
 531                 base->ep        = cpu_to_be32(base->ep);
 532         } else {
 533                 base->command   = be32_to_cpu(base->command);
 534                 base->seqnum    = be32_to_cpu(base->seqnum);
 535                 base->devid     = be32_to_cpu(base->devid);
 536                 base->direction = be32_to_cpu(base->direction);
 537                 base->ep        = be32_to_cpu(base->ep);
 538         }
 539 }
 540
 541 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 542                                       int send)
 543 {
 544         if (send) {
 545                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 546
 547                 cpu_to_be32s(&pdu->transfer_buffer_length);
 548                 cpu_to_be32s(&pdu->start_frame);
 549                 cpu_to_be32s(&pdu->number_of_packets);
 550                 cpu_to_be32s(&pdu->interval);
 551         } else {
 552                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 553
 554                 be32_to_cpus(&pdu->transfer_buffer_length);
 555                 be32_to_cpus(&pdu->start_frame);
 556                 be32_to_cpus(&pdu->number_of_packets);
 557                 be32_to_cpus(&pdu->interval);
 558         }
 559 }
 560
 561 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 562                                       int send)
 563 {
 564         if (send) {
 565                 cpu_to_be32s(&pdu->status);
 566                 cpu_to_be32s(&pdu->actual_length);
 567                 cpu_to_be32s(&pdu->start_frame);
 568                 cpu_to_be32s(&pdu->number_of_packets);
 569                 cpu_to_be32s(&pdu->error_count);
 570         } else {
 571                 be32_to_cpus(&pdu->status);
 572                 be32_to_cpus(&pdu->actual_length);
 573                 be32_to_cpus(&pdu->start_frame);
 574                 be32_to_cpus(&pdu->number_of_packets);
 575                 be32_to_cpus(&pdu->error_count);
 576         }
 577 }
 578
 579 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 580                                       int send)
 581 {
 582         if (send)
 583                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 584         else
 585                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 586 }
 587
 588 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 589                                       int send)
 590 {
 591         if (send)
 592                 cpu_to_be32s(&pdu->status);
 593         else
 594                 be32_to_cpus(&pdu->status);
 595 }
 596
 597 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 598 {
 599         __u32 cmd = 0;
 600
 601         if (send)
 602                 cmd = pdu->base.command;
 603
 604         correct_endian_basic(&pdu->base, send);
 605
 606         if (!send)
 607                 cmd = pdu->base.command;
 608
 609         switch (cmd) {
 610         case USBIP_CMD_SUBMIT:
 611                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 612                 break;
 613         case USBIP_RET_SUBMIT:
 614                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 615                 break;
 616         case USBIP_CMD_UNLINK:
 617                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 618                 break;
 619         case USBIP_RET_UNLINK:
 620                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 621                 break;
 622         default:
 623                 /* NOT REACHED */
 624                 pr_err("unknown command\n");
 625                 break;
 626         }
 627 }
 628 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 629
 630 static void usbip_iso_packet_correct_endian(
 631                 struct usbip_iso_packet_descriptor *iso, int send)
 632 {
 633         /* does not need all members. but copy all simply. */
 634         if (send) {
 635                 iso->offset     = cpu_to_be32(iso->offset);
 636                 iso->length     = cpu_to_be32(iso->length);
 637                 iso->status     = cpu_to_be32(iso->status);
 638                 iso->actual_length = cpu_to_be32(iso->actual_length);
 639         } else {
 640                 iso->offset     = be32_to_cpu(iso->offset);
 641                 iso->length     = be32_to_cpu(iso->length);
 642                 iso->status     = be32_to_cpu(iso->status);
 643                 iso->actual_length = be32_to_cpu(iso->actual_length);
 644         }
 645 }
 646
 647 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 648                            struct usb_iso_packet_descriptor *uiso, int pack)
 649 {
 650         if (pack) {
 651                 iso->offset             = uiso->offset;
 652                 iso->length             = uiso->length;
 653                 iso->status             = uiso->status;
 654                 iso->actual_length      = uiso->actual_length;
 655         } else {
 656                 uiso->offset            = iso->offset;
 657                 uiso->length            = iso->length;
 658                 uiso->status            = iso->status;
 659                 uiso->actual_length     = iso->actual_length;
 660         }
 661 }
 662
 663 /* must free buffer */
 664 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 665 {
 666         void *buff;
 667         struct usbip_iso_packet_descriptor *iso;
 668         int np = urb->number_of_packets;
 669         ssize_t size = np * sizeof(*iso);
 670         int i;
 671
 672         buff = kzalloc(size, GFP_KERNEL);
 673         if (!buff)
 674                 return NULL;
 675
 676         for (i = 0; i < np; i++) {
 677                 iso = buff + (i * sizeof(*iso));
 678
 679                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 680                 usbip_iso_packet_correct_endian(iso, 1);
 681         }
 682
 683         *bufflen = size;
 684
 685         return buff;
 686 }
 687 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 688
 689 /* some members of urb must be substituted before. */
 690 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 691 {
 692         void *buff;
 693         struct usbip_iso_packet_descriptor *iso;
 694         int np = urb->number_of_packets;
 695         int size = np * sizeof(*iso);
 696         int i;
 697         int ret;
 698         int total_length = 0;
 699
 700         if (!usb_pipeisoc(urb->pipe))
 701                 return 0;
 702
 703         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 704         if (np == 0) {
 705                 /* pr_info("iso np == 0\n"); */
 706                 /* usbip_dump_urb(urb); */
 707                 return 0;
 708         }
 709
 710         buff = kzalloc(size, GFP_KERNEL);
 711         if (!buff)
 712                 return -ENOMEM;
 713
 714         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 715         if (ret != size) {
 716                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 717                         ret);
 718                 kfree(buff);
 719
 720                 if (ud->side == USBIP_STUB)
 721                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 722                 else
 723                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 724
 725                 return -EPIPE;
 726         }
 727
 728         for (i = 0; i < np; i++) {
 729                 iso = buff + (i * sizeof(*iso));
 730
 731                 usbip_iso_packet_correct_endian(iso, 0);
 732                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 733                 total_length += urb->iso_frame_desc[i].actual_length;
 734         }
 735
 736         kfree(buff);
 737
 738         if (total_length != urb->actual_length) {
 739                 dev_err(&urb->dev->dev,
 740                         "total length of iso packets %d not equal to actual "
 741                         "length of buffer %d\n",
 742                         total_length, urb->actual_length);
 743
 744                 if (ud->side == USBIP_STUB)
 745                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 746                 else
 747                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 748
 749                 return -EPIPE;
 750         }
 751
 752         return ret;
 753 }
 754 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 755
 756 /*
 757  * This functions restores the padding which was removed for optimizing
 758  * the bandwidth during transfer over tcp/ip
 759  *
 760  * buffer and iso packets need to be stored and be in propeper endian in urb
 761  * before calling this function
 762  */
 763 int usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 764 {
 765         int np = urb->number_of_packets;
 766         int i;
 767         int ret;
 768         int actualoffset = urb->actual_length;
 769
 770         if (!usb_pipeisoc(urb->pipe))
 771                 return 0;
 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 0;
 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 0;
 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         return ret;
 796 }
 797 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 798
 799 /* some members of urb must be substituted before. */
 800 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 801 {
 802         int ret;
 803         int size;
 804
 805         if (ud->side == USBIP_STUB) {
 806                 /* stub_rx.c */
 807                 /* the direction of urb must be OUT. */
 808                 if (usb_pipein(urb->pipe))
 809                         return 0;
 810
 811                 size = urb->transfer_buffer_length;
 812         } else {
 813                 /* vhci_rx.c */
 814                 /* the direction of urb must be IN. */
 815                 if (usb_pipeout(urb->pipe))
 816                         return 0;
 817
 818                 size = urb->actual_length;
 819         }
 820
 821         /* no need to recv xbuff */
 822         if (!(size > 0))
 823                 return 0;
 824
 825         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 826                          size, 0);
 827         if (ret != size) {
 828                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 829                 if (ud->side == USBIP_STUB) {
 830                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 831                 } else {
 832                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 833                         return -EPIPE;
 834                 }
 835         }
 836
 837         return ret;
 838 }
 839 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 840
 841 static int __init usbip_core_init(void)
 842 {
 843         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 844         return 0;
 845 }
 846
 847 static void __exit usbip_core_exit(void)
 848 {
 849         return;
 850 }
 851
 852 module_init(usbip_core_init);
 853 module_exit(usbip_core_exit);
 854
 855 MODULE_AUTHOR(DRIVER_AUTHOR);
 856 MODULE_DESCRIPTION(DRIVER_DESC);
 857 MODULE_LICENSE("GPL");
 858 MODULE_VERSION(USBIP_VERSION);