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 <linux/kernel.h>
  21 #include <linux/file.h>
  22 #include <linux/tcp.h>
  23 #include <linux/in.h>
  24 #include "usbip_common.h"
  25
  26 /* version information */
  27 #define DRIVER_VERSION "1.0"
  28 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
  29 #define DRIVER_DESC "usbip common driver"
  30
  31 /*-------------------------------------------------------------------------*/
  32 /* debug routines */
  33
  34 #ifdef CONFIG_USB_DEBUG
  35 unsigned long usbip_debug_flag = 0xffffffff;
  36 #else
  37 unsigned long usbip_debug_flag;
  38 #endif
  39 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  40
  41
  42 /* FIXME */
  43 struct device_attribute dev_attr_usbip_debug;
  44 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  45
  46
  47 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  48                                                                 char *buf)
  49 {
  50         return sprintf(buf, "%lx\n", usbip_debug_flag);
  51 }
  52
  53 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  54                 const char *buf, size_t count)
  55 {
  56         unsigned long flag;
  57
  58         sscanf(buf, "%lx", &flag);
  59         usbip_debug_flag = flag;
  60
  61         return count;
  62 }
  63 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  64
  65 static void usbip_dump_buffer(char *buff, int bufflen)
  66 {
  67         int i;
  68
  69         if (bufflen > 128) {
  70                 for (i = 0; i < 128; i++) {
  71                         if (i%24 == 0)
  72                                 printk("   ");
  73                         printk("%02x ", (unsigned char) buff[i]);
  74                         if (i%4 == 3)
  75                                 printk("| ");
  76                         if (i%24 == 23)
  77                                 printk("\n");
  78                 }
  79                 printk("... (%d byte)\n", bufflen);
  80                 return;
  81         }
  82
  83         for (i = 0; i < bufflen; i++) {
  84                 if (i%24 == 0)
  85                         printk("   ");
  86                 printk("%02x ", (unsigned char) buff[i]);
  87                 if (i%4 == 3)
  88                         printk("| ");
  89                 if (i%24 == 23)
  90                         printk("\n");
  91         }
  92         printk("\n");
  93
  94 }
  95
  96 static void usbip_dump_pipe(unsigned int p)
  97 {
  98         unsigned char type = usb_pipetype(p);
  99         unsigned char ep = usb_pipeendpoint(p);
 100         unsigned char dev = usb_pipedevice(p);
 101         unsigned char dir = usb_pipein(p);
 102
 103         printk("dev(%d) ", dev);
 104         printk("ep(%d) ",  ep);
 105         printk("%s ", dir ? "IN" : "OUT");
 106
 107         switch (type) {
 108         case PIPE_ISOCHRONOUS:
 109                 printk("%s ", "ISO");
 110                 break;
 111         case PIPE_INTERRUPT:
 112                 printk("%s ", "INT");
 113                 break;
 114         case PIPE_CONTROL:
 115                 printk("%s ", "CTL");
 116                 break;
 117         case PIPE_BULK:
 118                 printk("%s ", "BLK");
 119                 break;
 120         default:
 121                 printk("ERR");
 122         }
 123
 124         printk("\n");
 125
 126 }
 127
 128 static void usbip_dump_usb_device(struct usb_device *udev)
 129 {
 130         struct device *dev = &udev->dev;
 131         int i;
 132
 133         dev_dbg(dev, "       devnum(%d) devpath(%s)",
 134                 udev->devnum, udev->devpath);
 135
 136         switch (udev->speed) {
 137         case USB_SPEED_HIGH:
 138                 printk(" SPD_HIGH");
 139                 break;
 140         case USB_SPEED_FULL:
 141                 printk(" SPD_FULL");
 142                 break;
 143         case USB_SPEED_LOW:
 144                 printk(" SPD_LOW");
 145                 break;
 146         case USB_SPEED_UNKNOWN:
 147                 printk(" SPD_UNKNOWN");
 148                 break;
 149         default:
 150                 printk(" SPD_ERROR");
 151         }
 152
 153         printk(" tt %p, ttport %d", udev->tt, udev->ttport);
 154         printk("\n");
 155
 156         dev_dbg(dev, "                    ");
 157         for (i = 0; i < 16; i++)
 158                 printk(" %2u", i);
 159         printk("\n");
 160
 161         dev_dbg(dev, "       toggle0(IN) :");
 162         for (i = 0; i < 16; i++)
 163                 printk(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 164         printk("\n");
 165
 166         dev_dbg(dev, "       toggle1(OUT):");
 167         for (i = 0; i < 16; i++)
 168                 printk(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 169         printk("\n");
 170
 171
 172         dev_dbg(dev, "       epmaxp_in   :");
 173         for (i = 0; i < 16; i++) {
 174                 if (udev->ep_in[i])
 175                         printk(" %2u",
 176                              le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 177         }
 178         printk("\n");
 179
 180         dev_dbg(dev, "       epmaxp_out  :");
 181         for (i = 0; i < 16; i++) {
 182                 if (udev->ep_out[i])
 183                         printk(" %2u",
 184                              le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 185         }
 186         printk("\n");
 187
 188         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 189
 190         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 191                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 192                 udev->actconfig, udev->rawdescriptors);
 193
 194         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 195                 udev->have_langid, udev->string_langid);
 196
 197         dev_dbg(dev, "maxchild %d, children %p\n",
 198                 udev->maxchild, udev->children);
 199 }
 200
 201 static void usbip_dump_request_type(__u8 rt)
 202 {
 203         switch (rt & USB_RECIP_MASK) {
 204         case USB_RECIP_DEVICE:
 205                 printk("DEVICE");
 206                 break;
 207         case USB_RECIP_INTERFACE:
 208                 printk("INTERF");
 209                 break;
 210         case USB_RECIP_ENDPOINT:
 211                 printk("ENDPOI");
 212                 break;
 213         case USB_RECIP_OTHER:
 214                 printk("OTHER ");
 215                 break;
 216         default:
 217                 printk("------");
 218         }
 219 }
 220
 221 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 222 {
 223         if (!cmd) {
 224                 printk("      %s : null pointer\n", __FUNCTION__);
 225                 return;
 226         }
 227
 228         printk("       ");
 229         printk("bRequestType(%02X) ", cmd->bRequestType);
 230         printk("bRequest(%02X) " , cmd->bRequest);
 231         printk("wValue(%04X) ", cmd->wValue);
 232         printk("wIndex(%04X) ", cmd->wIndex);
 233         printk("wLength(%04X) ", cmd->wLength);
 234
 235         printk("\n       ");
 236
 237         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 238                 printk("STANDARD ");
 239                 switch (cmd->bRequest) {
 240                 case USB_REQ_GET_STATUS:
 241                         printk("GET_STATUS");
 242                         break;
 243                 case USB_REQ_CLEAR_FEATURE:
 244                         printk("CLEAR_FEAT");
 245                         break;
 246                 case USB_REQ_SET_FEATURE:
 247                         printk("SET_FEAT  ");
 248                         break;
 249                 case USB_REQ_SET_ADDRESS:
 250                         printk("SET_ADDRRS");
 251                         break;
 252                 case USB_REQ_GET_DESCRIPTOR:
 253                         printk("GET_DESCRI");
 254                         break;
 255                 case USB_REQ_SET_DESCRIPTOR:
 256                         printk("SET_DESCRI");
 257                         break;
 258                 case USB_REQ_GET_CONFIGURATION:
 259                         printk("GET_CONFIG");
 260                         break;
 261                 case USB_REQ_SET_CONFIGURATION:
 262                         printk("SET_CONFIG");
 263                         break;
 264                 case USB_REQ_GET_INTERFACE:
 265                         printk("GET_INTERF");
 266                         break;
 267                 case USB_REQ_SET_INTERFACE:
 268                         printk("SET_INTERF");
 269                         break;
 270                 case USB_REQ_SYNCH_FRAME:
 271                         printk("SYNC_FRAME");
 272                         break;
 273                 default:
 274                         printk("REQ(%02X) ", cmd->bRequest);
 275                 }
 276
 277                 printk(" ");
 278                 usbip_dump_request_type(cmd->bRequestType);
 279
 280         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
 281                 printk("CLASS   ");
 282
 283         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
 284                 printk("VENDOR  ");
 285
 286         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
 287                 printk("RESERVED");
 288
 289         printk("\n");
 290 }
 291
 292 void usbip_dump_urb(struct urb *urb)
 293 {
 294         struct device *dev;
 295
 296         if (!urb) {
 297                 printk(KERN_DEBUG KBUILD_MODNAME
 298                        ":%s: urb: null pointer!!\n", __func__);
 299                 return;
 300         }
 301
 302         if (!urb->dev) {
 303                 printk(KERN_DEBUG KBUILD_MODNAME
 304                        ":%s: urb->dev: null pointer!!\n", __func__);
 305                 return;
 306         }
 307         dev = &urb->dev->dev;
 308
 309         dev_dbg(dev, "   urb                   :%p\n", urb);
 310         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 311
 312         usbip_dump_usb_device(urb->dev);
 313
 314         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 315
 316         usbip_dump_pipe(urb->pipe);
 317
 318         dev_dbg(dev, "   status                :%d\n", urb->status);
 319         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 320         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 321         dev_dbg(dev, "   transfer_buffer_length:%d\n", urb->transfer_buffer_length);
 322         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 323         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 324
 325         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 326                         usbip_dump_usb_ctrlrequest(
 327                         (struct usb_ctrlrequest *)urb->setup_packet);
 328
 329         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 330         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 331         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 332         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 333         dev_dbg(dev, "   context               :%p\n", urb->context);
 334         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 335 }
 336 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 337
 338 void usbip_dump_header(struct usbip_header *pdu)
 339 {
 340         udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 341                         pdu->base.command,
 342                         pdu->base.seqnum,
 343                         pdu->base.devid,
 344                         pdu->base.direction,
 345                         pdu->base.ep);
 346
 347         switch (pdu->base.command) {
 348         case USBIP_CMD_SUBMIT:
 349                 udbg("CMD_SUBMIT: x_flags %u x_len %u sf %u #p %u iv %u\n",
 350                                 pdu->u.cmd_submit.transfer_flags,
 351                                 pdu->u.cmd_submit.transfer_buffer_length,
 352                                 pdu->u.cmd_submit.start_frame,
 353                                 pdu->u.cmd_submit.number_of_packets,
 354                                 pdu->u.cmd_submit.interval);
 355                                 break;
 356         case USBIP_CMD_UNLINK:
 357                 udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
 358                 break;
 359         case USBIP_RET_SUBMIT:
 360                 udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
 361                                 pdu->u.ret_submit.status,
 362                                 pdu->u.ret_submit.actual_length,
 363                                 pdu->u.ret_submit.start_frame,
 364                                 pdu->u.ret_submit.error_count);
 365         case USBIP_RET_UNLINK:
 366                 udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
 367                 break;
 368         default:
 369                 /* NOT REACHED */
 370                 udbg("UNKNOWN\n");
 371         }
 372 }
 373 EXPORT_SYMBOL_GPL(usbip_dump_header);
 374
 375
 376 /*-------------------------------------------------------------------------*/
 377 /* thread routines */
 378
 379 int usbip_thread(void *param)
 380 {
 381         struct usbip_task *ut = param;
 382
 383         if (!ut)
 384                 return -EINVAL;
 385
 386         lock_kernel();
 387         daemonize(ut->name);
 388         allow_signal(SIGKILL);
 389         ut->thread = current;
 390         unlock_kernel();
 391
 392         /* srv.rb must wait for rx_thread starting */
 393         complete(&ut->thread_done);
 394
 395         /* start of while loop */
 396         ut->loop_ops(ut);
 397
 398         /* end of loop */
 399         ut->thread = NULL;
 400
 401         complete_and_exit(&ut->thread_done, 0);
 402 }
 403
 404 void usbip_start_threads(struct usbip_device *ud)
 405 {
 406         /*
 407          * threads are invoked per one device (per one connection).
 408          */
 409         kernel_thread(usbip_thread, (void *)&ud->tcp_rx, 0);
 410         kernel_thread(usbip_thread, (void *)&ud->tcp_tx, 0);
 411
 412         /* confirm threads are starting */
 413         wait_for_completion(&ud->tcp_rx.thread_done);
 414         wait_for_completion(&ud->tcp_tx.thread_done);
 415 }
 416 EXPORT_SYMBOL_GPL(usbip_start_threads);
 417
 418 void usbip_stop_threads(struct usbip_device *ud)
 419 {
 420         /* kill threads related to this sdev, if v.c. exists */
 421         if (ud->tcp_rx.thread != NULL) {
 422                 send_sig(SIGKILL, ud->tcp_rx.thread, 1);
 423                 wait_for_completion(&ud->tcp_rx.thread_done);
 424                 udbg("rx_thread for ud %p has finished\n", ud);
 425         }
 426
 427         if (ud->tcp_tx.thread != NULL) {
 428                 send_sig(SIGKILL, ud->tcp_tx.thread, 1);
 429                 wait_for_completion(&ud->tcp_tx.thread_done);
 430                 udbg("tx_thread for ud %p has finished\n", ud);
 431         }
 432 }
 433 EXPORT_SYMBOL_GPL(usbip_stop_threads);
 434
 435 void usbip_task_init(struct usbip_task *ut, char *name,
 436                 void (*loop_ops)(struct usbip_task *))
 437 {
 438         ut->thread = NULL;
 439         init_completion(&ut->thread_done);
 440         ut->name = name;
 441         ut->loop_ops = loop_ops;
 442 }
 443 EXPORT_SYMBOL_GPL(usbip_task_init);
 444
 445
 446 /*-------------------------------------------------------------------------*/
 447 /* socket routines */
 448
 449  /*  Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 450 int usbip_xmit(int send, struct socket *sock, char *buf,
 451                int size, int msg_flags)
 452 {
 453         int result;
 454         struct msghdr msg;
 455         struct kvec iov;
 456         int total = 0;
 457
 458         /* for blocks of if (dbg_flag_xmit) */
 459         char *bp = buf;
 460         int osize = size;
 461
 462         dbg_xmit("enter\n");
 463
 464         if (!sock || !buf || !size) {
 465                 printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
 466                        __func__, sock, buf, size);
 467                 return -EINVAL;
 468         }
 469
 470
 471         if (dbg_flag_xmit) {
 472                 if (send) {
 473                         if (!in_interrupt())
 474                                 printk(KERN_DEBUG "%-10s:", current->comm);
 475                         else
 476                                 printk(KERN_DEBUG "interupt  :");
 477
 478                         printk("%s: sending... , sock %p, buf %p, "
 479                                "size %d, msg_flags %d\n", __func__,
 480                                sock, buf, size, msg_flags);
 481                         usbip_dump_buffer(buf, size);
 482                 }
 483         }
 484
 485
 486         do {
 487                 sock->sk->sk_allocation = GFP_NOIO;
 488                 iov.iov_base    = buf;
 489                 iov.iov_len     = size;
 490                 msg.msg_name    = NULL;
 491                 msg.msg_namelen = 0;
 492                 msg.msg_control = NULL;
 493                 msg.msg_controllen = 0;
 494                 msg.msg_namelen    = 0;
 495                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 496
 497                 if (send)
 498                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 499                 else
 500                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 501                                                                 MSG_WAITALL);
 502
 503                 if (result <= 0) {
 504                         udbg("usbip_xmit: %s sock %p buf %p size %u ret %d"
 505                                         " total %d\n",
 506                                         send ? "send" : "receive", sock, buf,
 507                                         size, result, total);
 508                         goto err;
 509                 }
 510
 511                 size -= result;
 512                 buf += result;
 513                 total += result;
 514
 515         } while (size > 0);
 516
 517
 518         if (dbg_flag_xmit) {
 519                 if (!send) {
 520                         if (!in_interrupt())
 521                                 printk(KERN_DEBUG "%-10s:", current->comm);
 522                         else
 523                                 printk(KERN_DEBUG "interupt  :");
 524
 525                         printk("usbip_xmit: receiving....\n");
 526                         usbip_dump_buffer(bp, osize);
 527                         printk("usbip_xmit: received, osize %d ret %d size %d "
 528                                         "total %d\n", osize, result, size,
 529                                         total);
 530                 }
 531
 532                 if (send)
 533                         printk("usbip_xmit: send, total %d\n", total);
 534         }
 535
 536         return total;
 537
 538 err:
 539         return result;
 540 }
 541 EXPORT_SYMBOL_GPL(usbip_xmit);
 542
 543
 544 /* now a usrland utility should set options. */
 545 #if 0
 546 int setquickack(struct socket *socket)
 547 {
 548         mm_segment_t oldfs;
 549         int val = 1;
 550         int ret;
 551
 552         oldfs = get_fs();
 553         set_fs(get_ds());
 554         ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_QUICKACK,
 555                         (char __user *) &val, sizeof(ret));
 556         set_fs(oldfs);
 557
 558         return ret;
 559 }
 560
 561 int setnodelay(struct socket *socket)
 562 {
 563         mm_segment_t oldfs;
 564         int val = 1;
 565         int ret;
 566
 567         oldfs = get_fs();
 568         set_fs(get_ds());
 569         ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_NODELAY,
 570                         (char __user *) &val, sizeof(ret));
 571         set_fs(oldfs);
 572
 573         return ret;
 574 }
 575
 576 int setkeepalive(struct socket *socket)
 577 {
 578         mm_segment_t oldfs;
 579         int val = 1;
 580         int ret;
 581
 582         oldfs = get_fs();
 583         set_fs(get_ds());
 584         ret = socket->ops->setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE,
 585                         (char __user *) &val, sizeof(ret));
 586         set_fs(oldfs);
 587
 588         return ret;
 589 }
 590
 591 void setreuse(struct socket *socket)
 592 {
 593         socket->sk->sk_reuse = 1;
 594 }
 595 #endif
 596
 597 struct socket *sockfd_to_socket(unsigned int sockfd)
 598 {
 599         struct socket *socket;
 600         struct file *file;
 601         struct inode *inode;
 602
 603         file = fget(sockfd);
 604         if (!file) {
 605                 printk(KERN_ERR "%s: invalid sockfd\n", __func__);
 606                 return NULL;
 607         }
 608
 609         inode = file->f_dentry->d_inode;
 610
 611         if (!inode || !S_ISSOCK(inode->i_mode))
 612                 return NULL;
 613
 614         socket = SOCKET_I(inode);
 615
 616         return socket;
 617 }
 618 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 619
 620
 621
 622 /*-------------------------------------------------------------------------*/
 623 /* pdu routines */
 624
 625 /* there may be more cases to tweak the flags. */
 626 static unsigned int tweak_transfer_flags(unsigned int flags)
 627 {
 628
 629         if (flags & URB_NO_TRANSFER_DMA_MAP)
 630                 /*
 631                  * vhci_hcd does not provide DMA-mapped I/O. The upper
 632                  * driver does not need to set this flag. The remote
 633                  * usbip.ko does not still perform DMA-mapped I/O for
 634                  * DMA-caplable host controllers. So, clear this flag.
 635                  */
 636                 flags &= ~URB_NO_TRANSFER_DMA_MAP;
 637
 638         if (flags & URB_NO_SETUP_DMA_MAP)
 639                 flags &= ~URB_NO_SETUP_DMA_MAP;
 640
 641         return flags;
 642 }
 643
 644 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 645                                                                 int pack)
 646 {
 647         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 648
 649         /*
 650          * Some members are not still implemented in usbip. I hope this issue
 651          * will be discussed when usbip is ported to other operating systems.
 652          */
 653         if (pack) {
 654                 /* vhci_tx.c */
 655                 spdu->transfer_flags =
 656                                 tweak_transfer_flags(urb->transfer_flags);
 657                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 658                 spdu->start_frame               = urb->start_frame;
 659                 spdu->number_of_packets         = urb->number_of_packets;
 660                 spdu->interval                  = urb->interval;
 661         } else  {
 662                 /* stub_rx.c */
 663                 urb->transfer_flags         = spdu->transfer_flags;
 664
 665                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 666                 urb->start_frame            = spdu->start_frame;
 667                 urb->number_of_packets      = spdu->number_of_packets;
 668                 urb->interval               = spdu->interval;
 669         }
 670 }
 671
 672 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 673                                                                 int pack)
 674 {
 675         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 676
 677         if (pack) {
 678                 /* stub_tx.c */
 679
 680                 rpdu->status            = urb->status;
 681                 rpdu->actual_length     = urb->actual_length;
 682                 rpdu->start_frame       = urb->start_frame;
 683                 rpdu->error_count       = urb->error_count;
 684         } else {
 685                 /* vhci_rx.c */
 686
 687                 urb->status             = rpdu->status;
 688                 urb->actual_length      = rpdu->actual_length;
 689                 urb->start_frame        = rpdu->start_frame;
 690                 urb->error_count        = rpdu->error_count;
 691         }
 692 }
 693
 694
 695 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 696                                                                 int pack)
 697 {
 698         switch (cmd) {
 699         case USBIP_CMD_SUBMIT:
 700                 usbip_pack_cmd_submit(pdu, urb, pack);
 701                 break;
 702         case USBIP_RET_SUBMIT:
 703                 usbip_pack_ret_submit(pdu, urb, pack);
 704                 break;
 705         default:
 706                 err("unknown command");
 707                 /* NOTREACHED */
 708                 /* BUG(); */
 709         }
 710 }
 711 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 712
 713
 714 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 715 {
 716         if (send) {
 717                 base->command   = cpu_to_be32(base->command);
 718                 base->seqnum    = cpu_to_be32(base->seqnum);
 719                 base->devid     = cpu_to_be32(base->devid);
 720                 base->direction = cpu_to_be32(base->direction);
 721                 base->ep        = cpu_to_be32(base->ep);
 722         } else {
 723                 base->command   = be32_to_cpu(base->command);
 724                 base->seqnum    = be32_to_cpu(base->seqnum);
 725                 base->devid     = be32_to_cpu(base->devid);
 726                 base->direction = be32_to_cpu(base->direction);
 727                 base->ep        = be32_to_cpu(base->ep);
 728         }
 729 }
 730
 731 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 732                                                                 int send)
 733 {
 734         if (send) {
 735                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 736
 737                 cpu_to_be32s(&pdu->transfer_buffer_length);
 738                 cpu_to_be32s(&pdu->start_frame);
 739                 cpu_to_be32s(&pdu->number_of_packets);
 740                 cpu_to_be32s(&pdu->interval);
 741         } else {
 742                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 743
 744                 be32_to_cpus(&pdu->transfer_buffer_length);
 745                 be32_to_cpus(&pdu->start_frame);
 746                 be32_to_cpus(&pdu->number_of_packets);
 747                 be32_to_cpus(&pdu->interval);
 748         }
 749 }
 750
 751 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 752                                                                 int send)
 753 {
 754         if (send) {
 755                 cpu_to_be32s(&pdu->status);
 756                 cpu_to_be32s(&pdu->actual_length);
 757                 cpu_to_be32s(&pdu->start_frame);
 758                 cpu_to_be32s(&pdu->error_count);
 759         } else {
 760                 be32_to_cpus(&pdu->status);
 761                 be32_to_cpus(&pdu->actual_length);
 762                 be32_to_cpus(&pdu->start_frame);
 763                 be32_to_cpus(&pdu->error_count);
 764         }
 765 }
 766
 767 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 768                                                                 int send)
 769 {
 770         if (send)
 771                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 772         else
 773                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 774 }
 775
 776 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 777                                                                 int send)
 778 {
 779         if (send)
 780                 cpu_to_be32s(&pdu->status);
 781         else
 782                 be32_to_cpus(&pdu->status);
 783 }
 784
 785 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 786 {
 787         __u32 cmd = 0;
 788
 789         if (send)
 790                 cmd = pdu->base.command;
 791
 792         correct_endian_basic(&pdu->base, send);
 793
 794         if (!send)
 795                 cmd = pdu->base.command;
 796
 797         switch (cmd) {
 798         case USBIP_CMD_SUBMIT:
 799                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 800                 break;
 801         case USBIP_RET_SUBMIT:
 802                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 803                 break;
 804         case USBIP_CMD_UNLINK:
 805                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 806                 break;
 807         case USBIP_RET_UNLINK:
 808                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 809                 break;
 810         default:
 811                 /* NOTREACHED */
 812                 err("unknown command in pdu header: %d", cmd);
 813                 /* BUG(); */
 814         }
 815 }
 816 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 817
 818 static void usbip_iso_pakcet_correct_endian(
 819                                 struct usbip_iso_packet_descriptor *iso,
 820                                 int send)
 821 {
 822         /* does not need all members. but copy all simply. */
 823         if (send) {
 824                 iso->offset     = cpu_to_be32(iso->offset);
 825                 iso->length     = cpu_to_be32(iso->length);
 826                 iso->status     = cpu_to_be32(iso->status);
 827                 iso->actual_length = cpu_to_be32(iso->actual_length);
 828         } else {
 829                 iso->offset     = be32_to_cpu(iso->offset);
 830                 iso->length     = be32_to_cpu(iso->length);
 831                 iso->status     = be32_to_cpu(iso->status);
 832                 iso->actual_length = be32_to_cpu(iso->actual_length);
 833         }
 834 }
 835
 836 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 837                 struct usb_iso_packet_descriptor *uiso, int pack)
 838 {
 839         if (pack) {
 840                 iso->offset             = uiso->offset;
 841                 iso->length             = uiso->length;
 842                 iso->status             = uiso->status;
 843                 iso->actual_length      = uiso->actual_length;
 844         } else {
 845                 uiso->offset            = iso->offset;
 846                 uiso->length            = iso->length;
 847                 uiso->status            = iso->status;
 848                 uiso->actual_length     = iso->actual_length;
 849         }
 850 }
 851
 852
 853 /* must free buffer */
 854 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 855 {
 856         void *buff;
 857         struct usbip_iso_packet_descriptor *iso;
 858         int np = urb->number_of_packets;
 859         ssize_t size = np * sizeof(*iso);
 860         int i;
 861
 862         buff = kzalloc(size, GFP_KERNEL);
 863         if (!buff)
 864                 return NULL;
 865
 866         for (i = 0; i < np; i++) {
 867                 iso = buff + (i * sizeof(*iso));
 868
 869                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 870                 usbip_iso_pakcet_correct_endian(iso, 1);
 871         }
 872
 873         *bufflen = size;
 874
 875         return buff;
 876 }
 877 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 878
 879 /* some members of urb must be substituted before. */
 880 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 881 {
 882         void *buff;
 883         struct usbip_iso_packet_descriptor *iso;
 884         int np = urb->number_of_packets;
 885         int size = np * sizeof(*iso);
 886         int i;
 887         int ret;
 888
 889         if (!usb_pipeisoc(urb->pipe))
 890                 return 0;
 891
 892         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 893         if (np == 0) {
 894                 /* uinfo("iso np == 0\n"); */
 895                 /* usbip_dump_urb(urb); */
 896                 return 0;
 897         }
 898
 899         buff = kzalloc(size, GFP_KERNEL);
 900         if (!buff)
 901                 return -ENOMEM;
 902
 903         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 904         if (ret != size) {
 905                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 906                         ret);
 907                 kfree(buff);
 908
 909                 if (ud->side == USBIP_STUB)
 910                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 911                 else
 912                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 913
 914                 return -EPIPE;
 915         }
 916
 917         for (i = 0; i < np; i++) {
 918                 iso = buff + (i * sizeof(*iso));
 919
 920                 usbip_iso_pakcet_correct_endian(iso, 0);
 921                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 922         }
 923
 924
 925         kfree(buff);
 926
 927         return ret;
 928 }
 929 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 930
 931
 932 /* some members of urb must be substituted before. */
 933 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 934 {
 935         int ret;
 936         int size;
 937
 938         if (ud->side == USBIP_STUB) {
 939                 /* stub_rx.c */
 940                 /* the direction of urb must be OUT. */
 941                 if (usb_pipein(urb->pipe))
 942                         return 0;
 943
 944                 size = urb->transfer_buffer_length;
 945         } else {
 946                 /* vhci_rx.c */
 947                 /* the direction of urb must be IN. */
 948                 if (usb_pipeout(urb->pipe))
 949                         return 0;
 950
 951                 size = urb->actual_length;
 952         }
 953
 954         /* no need to recv xbuff */
 955         if (!(size > 0))
 956                 return 0;
 957
 958         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 959                          size, 0);
 960         if (ret != size) {
 961                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 962                 if (ud->side == USBIP_STUB) {
 963                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 964                 } else {
 965                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 966                         return -EPIPE;
 967                 }
 968         }
 969
 970         return ret;
 971 }
 972 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 973
 974
 975 /*-------------------------------------------------------------------------*/
 976
 977 static int __init usbip_common_init(void)
 978 {
 979         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
 980
 981         return 0;
 982 }
 983
 984 static void __exit usbip_common_exit(void)
 985 {
 986         return;
 987 }
 988
 989
 990
 991
 992 module_init(usbip_common_init);
 993 module_exit(usbip_common_exit);
 994
 995 MODULE_AUTHOR(DRIVER_AUTHOR);
 996 MODULE_DESCRIPTION(DRIVER_DESC);
 997 MODULE_LICENSE("GPL");