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 /* Receive data over TCP/IP. */
 338 int usbip_recv(struct socket *sock, void *buf, int size)
 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         do {
 358                 sock->sk->sk_allocation = GFP_NOIO;
 359                 iov.iov_base    = buf;
 360                 iov.iov_len     = size;
 361                 msg.msg_name    = NULL;
 362                 msg.msg_namelen = 0;
 363                 msg.msg_control = NULL;
 364                 msg.msg_controllen = 0;
 365                 msg.msg_namelen    = 0;
 366                 msg.msg_flags      = MSG_NOSIGNAL;
 367
 368                 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
 369                 if (result <= 0) {
 370                         pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
 371                                  sock, buf, size, result, total);
 372                         goto err;
 373                 }
 374
 375                 size -= result;
 376                 buf += result;
 377                 total += result;
 378         } while (size > 0);
 379
 380         if (usbip_dbg_flag_xmit) {
 381                 if (!in_interrupt())
 382                         pr_debug("%-10s:", current->comm);
 383                 else
 384                         pr_debug("interrupt  :");
 385
 386                 pr_debug("receiving....\n");
 387                 usbip_dump_buffer(bp, osize);
 388                 pr_debug("received, osize %d ret %d size %d total %d\n",
 389                         osize, result, size, total);
 390         }
 391
 392         return total;
 393
 394 err:
 395         return result;
 396 }
 397 EXPORT_SYMBOL_GPL(usbip_recv);
 398
 399 struct socket *sockfd_to_socket(unsigned int sockfd)
 400 {
 401         struct socket *socket;
 402         struct file *file;
 403         struct inode *inode;
 404
 405         file = fget(sockfd);
 406         if (!file) {
 407                 pr_err("invalid sockfd\n");
 408                 return NULL;
 409         }
 410
 411         inode = file->f_dentry->d_inode;
 412
 413         if (!inode || !S_ISSOCK(inode->i_mode))
 414                 return NULL;
 415
 416         socket = SOCKET_I(inode);
 417
 418         return socket;
 419 }
 420 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 421
 422 /* there may be more cases to tweak the flags. */
 423 static unsigned int tweak_transfer_flags(unsigned int flags)
 424 {
 425         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 426         return flags;
 427 }
 428
 429 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 430                                   int pack)
 431 {
 432         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 433
 434         /*
 435          * Some members are not still implemented in usbip. I hope this issue
 436          * will be discussed when usbip is ported to other operating systems.
 437          */
 438         if (pack) {
 439                 /* vhci_tx.c */
 440                 spdu->transfer_flags =
 441                         tweak_transfer_flags(urb->transfer_flags);
 442                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 443                 spdu->start_frame               = urb->start_frame;
 444                 spdu->number_of_packets         = urb->number_of_packets;
 445                 spdu->interval                  = urb->interval;
 446         } else  {
 447                 /* stub_rx.c */
 448                 urb->transfer_flags         = spdu->transfer_flags;
 449
 450                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 451                 urb->start_frame            = spdu->start_frame;
 452                 urb->number_of_packets      = spdu->number_of_packets;
 453                 urb->interval               = spdu->interval;
 454         }
 455 }
 456
 457 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 458                                   int pack)
 459 {
 460         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 461
 462         if (pack) {
 463                 /* stub_tx.c */
 464
 465                 rpdu->status            = urb->status;
 466                 rpdu->actual_length     = urb->actual_length;
 467                 rpdu->start_frame       = urb->start_frame;
 468                 rpdu->number_of_packets = urb->number_of_packets;
 469                 rpdu->error_count       = urb->error_count;
 470         } else {
 471                 /* vhci_rx.c */
 472
 473                 urb->status             = rpdu->status;
 474                 urb->actual_length      = rpdu->actual_length;
 475                 urb->start_frame        = rpdu->start_frame;
 476                 urb->number_of_packets = rpdu->number_of_packets;
 477                 urb->error_count        = rpdu->error_count;
 478         }
 479 }
 480
 481 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 482                     int pack)
 483 {
 484         switch (cmd) {
 485         case USBIP_CMD_SUBMIT:
 486                 usbip_pack_cmd_submit(pdu, urb, pack);
 487                 break;
 488         case USBIP_RET_SUBMIT:
 489                 usbip_pack_ret_submit(pdu, urb, pack);
 490                 break;
 491         default:
 492                 /* NOT REACHED */
 493                 pr_err("unknown command\n");
 494                 break;
 495         }
 496 }
 497 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 498
 499 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 500 {
 501         if (send) {
 502                 base->command   = cpu_to_be32(base->command);
 503                 base->seqnum    = cpu_to_be32(base->seqnum);
 504                 base->devid     = cpu_to_be32(base->devid);
 505                 base->direction = cpu_to_be32(base->direction);
 506                 base->ep        = cpu_to_be32(base->ep);
 507         } else {
 508                 base->command   = be32_to_cpu(base->command);
 509                 base->seqnum    = be32_to_cpu(base->seqnum);
 510                 base->devid     = be32_to_cpu(base->devid);
 511                 base->direction = be32_to_cpu(base->direction);
 512                 base->ep        = be32_to_cpu(base->ep);
 513         }
 514 }
 515
 516 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 517                                       int send)
 518 {
 519         if (send) {
 520                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 521
 522                 cpu_to_be32s(&pdu->transfer_buffer_length);
 523                 cpu_to_be32s(&pdu->start_frame);
 524                 cpu_to_be32s(&pdu->number_of_packets);
 525                 cpu_to_be32s(&pdu->interval);
 526         } else {
 527                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 528
 529                 be32_to_cpus(&pdu->transfer_buffer_length);
 530                 be32_to_cpus(&pdu->start_frame);
 531                 be32_to_cpus(&pdu->number_of_packets);
 532                 be32_to_cpus(&pdu->interval);
 533         }
 534 }
 535
 536 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 537                                       int send)
 538 {
 539         if (send) {
 540                 cpu_to_be32s(&pdu->status);
 541                 cpu_to_be32s(&pdu->actual_length);
 542                 cpu_to_be32s(&pdu->start_frame);
 543                 cpu_to_be32s(&pdu->number_of_packets);
 544                 cpu_to_be32s(&pdu->error_count);
 545         } else {
 546                 be32_to_cpus(&pdu->status);
 547                 be32_to_cpus(&pdu->actual_length);
 548                 be32_to_cpus(&pdu->start_frame);
 549                 be32_to_cpus(&pdu->number_of_packets);
 550                 be32_to_cpus(&pdu->error_count);
 551         }
 552 }
 553
 554 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 555                                       int send)
 556 {
 557         if (send)
 558                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 559         else
 560                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 561 }
 562
 563 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 564                                       int send)
 565 {
 566         if (send)
 567                 cpu_to_be32s(&pdu->status);
 568         else
 569                 be32_to_cpus(&pdu->status);
 570 }
 571
 572 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 573 {
 574         __u32 cmd = 0;
 575
 576         if (send)
 577                 cmd = pdu->base.command;
 578
 579         correct_endian_basic(&pdu->base, send);
 580
 581         if (!send)
 582                 cmd = pdu->base.command;
 583
 584         switch (cmd) {
 585         case USBIP_CMD_SUBMIT:
 586                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 587                 break;
 588         case USBIP_RET_SUBMIT:
 589                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 590                 break;
 591         case USBIP_CMD_UNLINK:
 592                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 593                 break;
 594         case USBIP_RET_UNLINK:
 595                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 596                 break;
 597         default:
 598                 /* NOT REACHED */
 599                 pr_err("unknown command\n");
 600                 break;
 601         }
 602 }
 603 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 604
 605 static void usbip_iso_packet_correct_endian(
 606                 struct usbip_iso_packet_descriptor *iso, int send)
 607 {
 608         /* does not need all members. but copy all simply. */
 609         if (send) {
 610                 iso->offset     = cpu_to_be32(iso->offset);
 611                 iso->length     = cpu_to_be32(iso->length);
 612                 iso->status     = cpu_to_be32(iso->status);
 613                 iso->actual_length = cpu_to_be32(iso->actual_length);
 614         } else {
 615                 iso->offset     = be32_to_cpu(iso->offset);
 616                 iso->length     = be32_to_cpu(iso->length);
 617                 iso->status     = be32_to_cpu(iso->status);
 618                 iso->actual_length = be32_to_cpu(iso->actual_length);
 619         }
 620 }
 621
 622 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 623                            struct usb_iso_packet_descriptor *uiso, int pack)
 624 {
 625         if (pack) {
 626                 iso->offset             = uiso->offset;
 627                 iso->length             = uiso->length;
 628                 iso->status             = uiso->status;
 629                 iso->actual_length      = uiso->actual_length;
 630         } else {
 631                 uiso->offset            = iso->offset;
 632                 uiso->length            = iso->length;
 633                 uiso->status            = iso->status;
 634                 uiso->actual_length     = iso->actual_length;
 635         }
 636 }
 637
 638 /* must free buffer */
 639 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 640 {
 641         void *buff;
 642         struct usbip_iso_packet_descriptor *iso;
 643         int np = urb->number_of_packets;
 644         ssize_t size = np * sizeof(*iso);
 645         int i;
 646
 647         buff = kzalloc(size, GFP_KERNEL);
 648         if (!buff)
 649                 return NULL;
 650
 651         for (i = 0; i < np; i++) {
 652                 iso = buff + (i * sizeof(*iso));
 653
 654                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 655                 usbip_iso_packet_correct_endian(iso, 1);
 656         }
 657
 658         *bufflen = size;
 659
 660         return buff;
 661 }
 662 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 663
 664 /* some members of urb must be substituted before. */
 665 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 666 {
 667         void *buff;
 668         struct usbip_iso_packet_descriptor *iso;
 669         int np = urb->number_of_packets;
 670         int size = np * sizeof(*iso);
 671         int i;
 672         int ret;
 673         int total_length = 0;
 674
 675         if (!usb_pipeisoc(urb->pipe))
 676                 return 0;
 677
 678         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 679         if (np == 0) {
 680                 /* pr_info("iso np == 0\n"); */
 681                 /* usbip_dump_urb(urb); */
 682                 return 0;
 683         }
 684
 685         buff = kzalloc(size, GFP_KERNEL);
 686         if (!buff)
 687                 return -ENOMEM;
 688
 689         ret = usbip_recv(ud->tcp_socket, buff, size);
 690         if (ret != size) {
 691                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 692                         ret);
 693                 kfree(buff);
 694
 695                 if (ud->side == USBIP_STUB)
 696                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 697                 else
 698                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 699
 700                 return -EPIPE;
 701         }
 702
 703         for (i = 0; i < np; i++) {
 704                 iso = buff + (i * sizeof(*iso));
 705
 706                 usbip_iso_packet_correct_endian(iso, 0);
 707                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 708                 total_length += urb->iso_frame_desc[i].actual_length;
 709         }
 710
 711         kfree(buff);
 712
 713         if (total_length != urb->actual_length) {
 714                 dev_err(&urb->dev->dev,
 715                         "total length of iso packets %d not equal to actual "
 716                         "length of buffer %d\n",
 717                         total_length, urb->actual_length);
 718
 719                 if (ud->side == USBIP_STUB)
 720                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 721                 else
 722                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 723
 724                 return -EPIPE;
 725         }
 726
 727         return ret;
 728 }
 729 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 730
 731 /*
 732  * This functions restores the padding which was removed for optimizing
 733  * the bandwidth during transfer over tcp/ip
 734  *
 735  * buffer and iso packets need to be stored and be in propeper endian in urb
 736  * before calling this function
 737  */
 738 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 739 {
 740         int np = urb->number_of_packets;
 741         int i;
 742         int actualoffset = urb->actual_length;
 743
 744         if (!usb_pipeisoc(urb->pipe))
 745                 return;
 746
 747         /* if no packets or length of data is 0, then nothing to unpack */
 748         if (np == 0 || urb->actual_length == 0)
 749                 return;
 750
 751         /*
 752          * if actual_length is transfer_buffer_length then no padding is
 753          * present.
 754         */
 755         if (urb->actual_length == urb->transfer_buffer_length)
 756                 return;
 757
 758         /*
 759          * loop over all packets from last to first (to prevent overwritting
 760          * memory when padding) and move them into the proper place
 761          */
 762         for (i = np-1; i > 0; i--) {
 763                 actualoffset -= urb->iso_frame_desc[i].actual_length;
 764                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 765                         urb->transfer_buffer + actualoffset,
 766                         urb->iso_frame_desc[i].actual_length);
 767         }
 768 }
 769 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 770
 771 /* some members of urb must be substituted before. */
 772 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 773 {
 774         int ret;
 775         int size;
 776
 777         if (ud->side == USBIP_STUB) {
 778                 /* stub_rx.c */
 779                 /* the direction of urb must be OUT. */
 780                 if (usb_pipein(urb->pipe))
 781                         return 0;
 782
 783                 size = urb->transfer_buffer_length;
 784         } else {
 785                 /* vhci_rx.c */
 786                 /* the direction of urb must be IN. */
 787                 if (usb_pipeout(urb->pipe))
 788                         return 0;
 789
 790                 size = urb->actual_length;
 791         }
 792
 793         /* no need to recv xbuff */
 794         if (!(size > 0))
 795                 return 0;
 796
 797         if (size > urb->transfer_buffer_length) {
 798                 /* should not happen, probably malicious packet */
 799                 if (ud->side == USBIP_STUB) {
 800                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 801                         return 0;
 802                 } else {
 803                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 804                         return -EPIPE;
 805                 }
 806         }
 807
 808         ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
 809         if (ret != size) {
 810                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 811                 if (ud->side == USBIP_STUB) {
 812                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 813                 } else {
 814                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 815                         return -EPIPE;
 816                 }
 817         }
 818
 819         return ret;
 820 }
 821 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 822
 823 static int __init usbip_core_init(void)
 824 {
 825         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 826         return 0;
 827 }
 828
 829 static void __exit usbip_core_exit(void)
 830 {
 831         return;
 832 }
 833
 834 module_init(usbip_core_init);
 835 module_exit(usbip_core_exit);
 836
 837 MODULE_AUTHOR(DRIVER_AUTHOR);
 838 MODULE_DESCRIPTION(DRIVER_DESC);
 839 MODULE_LICENSE("GPL");
 840 MODULE_VERSION(USBIP_VERSION);