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", __func__);
 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         int retval;
 410
 411         retval = kernel_thread(usbip_thread, (void *)&ud->tcp_rx, 0);
 412         if (retval < 0) {
 413                 printk(KERN_ERR "Creating tcp_rx thread for ud %p failed.\n",
 414                                 ud);
 415                 return;
 416         }
 417         retval = kernel_thread(usbip_thread, (void *)&ud->tcp_tx, 0);
 418         if (retval < 0) {
 419                 printk(KERN_ERR "Creating tcp_tx thread for ud %p failed.\n",
 420                                 ud);
 421                 return;
 422         }
 423
 424         /* confirm threads are starting */
 425         wait_for_completion(&ud->tcp_rx.thread_done);
 426         wait_for_completion(&ud->tcp_tx.thread_done);
 427 }
 428 EXPORT_SYMBOL_GPL(usbip_start_threads);
 429
 430 void usbip_stop_threads(struct usbip_device *ud)
 431 {
 432         /* kill threads related to this sdev, if v.c. exists */
 433         if (ud->tcp_rx.thread != NULL) {
 434                 send_sig(SIGKILL, ud->tcp_rx.thread, 1);
 435                 wait_for_completion(&ud->tcp_rx.thread_done);
 436                 udbg("rx_thread for ud %p has finished\n", ud);
 437         }
 438
 439         if (ud->tcp_tx.thread != NULL) {
 440                 send_sig(SIGKILL, ud->tcp_tx.thread, 1);
 441                 wait_for_completion(&ud->tcp_tx.thread_done);
 442                 udbg("tx_thread for ud %p has finished\n", ud);
 443         }
 444 }
 445 EXPORT_SYMBOL_GPL(usbip_stop_threads);
 446
 447 void usbip_task_init(struct usbip_task *ut, char *name,
 448                 void (*loop_ops)(struct usbip_task *))
 449 {
 450         ut->thread = NULL;
 451         init_completion(&ut->thread_done);
 452         ut->name = name;
 453         ut->loop_ops = loop_ops;
 454 }
 455 EXPORT_SYMBOL_GPL(usbip_task_init);
 456
 457
 458 /*-------------------------------------------------------------------------*/
 459 /* socket routines */
 460
 461  /*  Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 462 int usbip_xmit(int send, struct socket *sock, char *buf,
 463                int size, int msg_flags)
 464 {
 465         int result;
 466         struct msghdr msg;
 467         struct kvec iov;
 468         int total = 0;
 469
 470         /* for blocks of if (dbg_flag_xmit) */
 471         char *bp = buf;
 472         int osize = size;
 473
 474         dbg_xmit("enter\n");
 475
 476         if (!sock || !buf || !size) {
 477                 printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
 478                        __func__, sock, buf, size);
 479                 return -EINVAL;
 480         }
 481
 482
 483         if (dbg_flag_xmit) {
 484                 if (send) {
 485                         if (!in_interrupt())
 486                                 printk(KERN_DEBUG "%-10s:", current->comm);
 487                         else
 488                                 printk(KERN_DEBUG "interupt  :");
 489
 490                         printk("%s: sending... , sock %p, buf %p, "
 491                                "size %d, msg_flags %d\n", __func__,
 492                                sock, buf, size, msg_flags);
 493                         usbip_dump_buffer(buf, size);
 494                 }
 495         }
 496
 497
 498         do {
 499                 sock->sk->sk_allocation = GFP_NOIO;
 500                 iov.iov_base    = buf;
 501                 iov.iov_len     = size;
 502                 msg.msg_name    = NULL;
 503                 msg.msg_namelen = 0;
 504                 msg.msg_control = NULL;
 505                 msg.msg_controllen = 0;
 506                 msg.msg_namelen    = 0;
 507                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 508
 509                 if (send)
 510                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 511                 else
 512                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 513                                                                 MSG_WAITALL);
 514
 515                 if (result <= 0) {
 516                         udbg("usbip_xmit: %s sock %p buf %p size %u ret %d"
 517                                         " total %d\n",
 518                                         send ? "send" : "receive", sock, buf,
 519                                         size, result, total);
 520                         goto err;
 521                 }
 522
 523                 size -= result;
 524                 buf += result;
 525                 total += result;
 526
 527         } while (size > 0);
 528
 529
 530         if (dbg_flag_xmit) {
 531                 if (!send) {
 532                         if (!in_interrupt())
 533                                 printk(KERN_DEBUG "%-10s:", current->comm);
 534                         else
 535                                 printk(KERN_DEBUG "interupt  :");
 536
 537                         printk("usbip_xmit: receiving....\n");
 538                         usbip_dump_buffer(bp, osize);
 539                         printk("usbip_xmit: received, osize %d ret %d size %d "
 540                                         "total %d\n", osize, result, size,
 541                                         total);
 542                 }
 543
 544                 if (send)
 545                         printk("usbip_xmit: send, total %d\n", total);
 546         }
 547
 548         return total;
 549
 550 err:
 551         return result;
 552 }
 553 EXPORT_SYMBOL_GPL(usbip_xmit);
 554
 555
 556 /* now a usrland utility should set options. */
 557 #if 0
 558 int setquickack(struct socket *socket)
 559 {
 560         mm_segment_t oldfs;
 561         int val = 1;
 562         int ret;
 563
 564         oldfs = get_fs();
 565         set_fs(get_ds());
 566         ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_QUICKACK,
 567                         (char __user *) &val, sizeof(ret));
 568         set_fs(oldfs);
 569
 570         return ret;
 571 }
 572
 573 int setnodelay(struct socket *socket)
 574 {
 575         mm_segment_t oldfs;
 576         int val = 1;
 577         int ret;
 578
 579         oldfs = get_fs();
 580         set_fs(get_ds());
 581         ret = socket->ops->setsockopt(socket, SOL_TCP, TCP_NODELAY,
 582                         (char __user *) &val, sizeof(ret));
 583         set_fs(oldfs);
 584
 585         return ret;
 586 }
 587
 588 int setkeepalive(struct socket *socket)
 589 {
 590         mm_segment_t oldfs;
 591         int val = 1;
 592         int ret;
 593
 594         oldfs = get_fs();
 595         set_fs(get_ds());
 596         ret = socket->ops->setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE,
 597                         (char __user *) &val, sizeof(ret));
 598         set_fs(oldfs);
 599
 600         return ret;
 601 }
 602
 603 void setreuse(struct socket *socket)
 604 {
 605         socket->sk->sk_reuse = 1;
 606 }
 607 #endif
 608
 609 struct socket *sockfd_to_socket(unsigned int sockfd)
 610 {
 611         struct socket *socket;
 612         struct file *file;
 613         struct inode *inode;
 614
 615         file = fget(sockfd);
 616         if (!file) {
 617                 printk(KERN_ERR "%s: invalid sockfd\n", __func__);
 618                 return NULL;
 619         }
 620
 621         inode = file->f_dentry->d_inode;
 622
 623         if (!inode || !S_ISSOCK(inode->i_mode))
 624                 return NULL;
 625
 626         socket = SOCKET_I(inode);
 627
 628         return socket;
 629 }
 630 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 631
 632
 633
 634 /*-------------------------------------------------------------------------*/
 635 /* pdu routines */
 636
 637 /* there may be more cases to tweak the flags. */
 638 static unsigned int tweak_transfer_flags(unsigned int flags)
 639 {
 640
 641         if (flags & URB_NO_TRANSFER_DMA_MAP)
 642                 /*
 643                  * vhci_hcd does not provide DMA-mapped I/O. The upper
 644                  * driver does not need to set this flag. The remote
 645                  * usbip.ko does not still perform DMA-mapped I/O for
 646                  * DMA-caplable host controllers. So, clear this flag.
 647                  */
 648                 flags &= ~URB_NO_TRANSFER_DMA_MAP;
 649
 650         if (flags & URB_NO_SETUP_DMA_MAP)
 651                 flags &= ~URB_NO_SETUP_DMA_MAP;
 652
 653         return flags;
 654 }
 655
 656 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 657                                                                 int pack)
 658 {
 659         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 660
 661         /*
 662          * Some members are not still implemented in usbip. I hope this issue
 663          * will be discussed when usbip is ported to other operating systems.
 664          */
 665         if (pack) {
 666                 /* vhci_tx.c */
 667                 spdu->transfer_flags =
 668                                 tweak_transfer_flags(urb->transfer_flags);
 669                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 670                 spdu->start_frame               = urb->start_frame;
 671                 spdu->number_of_packets         = urb->number_of_packets;
 672                 spdu->interval                  = urb->interval;
 673         } else  {
 674                 /* stub_rx.c */
 675                 urb->transfer_flags         = spdu->transfer_flags;
 676
 677                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 678                 urb->start_frame            = spdu->start_frame;
 679                 urb->number_of_packets      = spdu->number_of_packets;
 680                 urb->interval               = spdu->interval;
 681         }
 682 }
 683
 684 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 685                                                                 int pack)
 686 {
 687         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 688
 689         if (pack) {
 690                 /* stub_tx.c */
 691
 692                 rpdu->status            = urb->status;
 693                 rpdu->actual_length     = urb->actual_length;
 694                 rpdu->start_frame       = urb->start_frame;
 695                 rpdu->error_count       = urb->error_count;
 696         } else {
 697                 /* vhci_rx.c */
 698
 699                 urb->status             = rpdu->status;
 700                 urb->actual_length      = rpdu->actual_length;
 701                 urb->start_frame        = rpdu->start_frame;
 702                 urb->error_count        = rpdu->error_count;
 703         }
 704 }
 705
 706
 707 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 708                                                                 int pack)
 709 {
 710         switch (cmd) {
 711         case USBIP_CMD_SUBMIT:
 712                 usbip_pack_cmd_submit(pdu, urb, pack);
 713                 break;
 714         case USBIP_RET_SUBMIT:
 715                 usbip_pack_ret_submit(pdu, urb, pack);
 716                 break;
 717         default:
 718                 err("unknown command");
 719                 /* NOTREACHED */
 720                 /* BUG(); */
 721         }
 722 }
 723 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 724
 725
 726 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 727 {
 728         if (send) {
 729                 base->command   = cpu_to_be32(base->command);
 730                 base->seqnum    = cpu_to_be32(base->seqnum);
 731                 base->devid     = cpu_to_be32(base->devid);
 732                 base->direction = cpu_to_be32(base->direction);
 733                 base->ep        = cpu_to_be32(base->ep);
 734         } else {
 735                 base->command   = be32_to_cpu(base->command);
 736                 base->seqnum    = be32_to_cpu(base->seqnum);
 737                 base->devid     = be32_to_cpu(base->devid);
 738                 base->direction = be32_to_cpu(base->direction);
 739                 base->ep        = be32_to_cpu(base->ep);
 740         }
 741 }
 742
 743 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 744                                                                 int send)
 745 {
 746         if (send) {
 747                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 748
 749                 cpu_to_be32s(&pdu->transfer_buffer_length);
 750                 cpu_to_be32s(&pdu->start_frame);
 751                 cpu_to_be32s(&pdu->number_of_packets);
 752                 cpu_to_be32s(&pdu->interval);
 753         } else {
 754                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 755
 756                 be32_to_cpus(&pdu->transfer_buffer_length);
 757                 be32_to_cpus(&pdu->start_frame);
 758                 be32_to_cpus(&pdu->number_of_packets);
 759                 be32_to_cpus(&pdu->interval);
 760         }
 761 }
 762
 763 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 764                                                                 int send)
 765 {
 766         if (send) {
 767                 cpu_to_be32s(&pdu->status);
 768                 cpu_to_be32s(&pdu->actual_length);
 769                 cpu_to_be32s(&pdu->start_frame);
 770                 cpu_to_be32s(&pdu->error_count);
 771         } else {
 772                 be32_to_cpus(&pdu->status);
 773                 be32_to_cpus(&pdu->actual_length);
 774                 be32_to_cpus(&pdu->start_frame);
 775                 be32_to_cpus(&pdu->error_count);
 776         }
 777 }
 778
 779 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 780                                                                 int send)
 781 {
 782         if (send)
 783                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 784         else
 785                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 786 }
 787
 788 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 789                                                                 int send)
 790 {
 791         if (send)
 792                 cpu_to_be32s(&pdu->status);
 793         else
 794                 be32_to_cpus(&pdu->status);
 795 }
 796
 797 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 798 {
 799         __u32 cmd = 0;
 800
 801         if (send)
 802                 cmd = pdu->base.command;
 803
 804         correct_endian_basic(&pdu->base, send);
 805
 806         if (!send)
 807                 cmd = pdu->base.command;
 808
 809         switch (cmd) {
 810         case USBIP_CMD_SUBMIT:
 811                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 812                 break;
 813         case USBIP_RET_SUBMIT:
 814                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 815                 break;
 816         case USBIP_CMD_UNLINK:
 817                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 818                 break;
 819         case USBIP_RET_UNLINK:
 820                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 821                 break;
 822         default:
 823                 /* NOTREACHED */
 824                 err("unknown command in pdu header: %d", cmd);
 825                 /* BUG(); */
 826         }
 827 }
 828 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 829
 830 static void usbip_iso_pakcet_correct_endian(
 831                                 struct usbip_iso_packet_descriptor *iso,
 832                                 int send)
 833 {
 834         /* does not need all members. but copy all simply. */
 835         if (send) {
 836                 iso->offset     = cpu_to_be32(iso->offset);
 837                 iso->length     = cpu_to_be32(iso->length);
 838                 iso->status     = cpu_to_be32(iso->status);
 839                 iso->actual_length = cpu_to_be32(iso->actual_length);
 840         } else {
 841                 iso->offset     = be32_to_cpu(iso->offset);
 842                 iso->length     = be32_to_cpu(iso->length);
 843                 iso->status     = be32_to_cpu(iso->status);
 844                 iso->actual_length = be32_to_cpu(iso->actual_length);
 845         }
 846 }
 847
 848 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 849                 struct usb_iso_packet_descriptor *uiso, int pack)
 850 {
 851         if (pack) {
 852                 iso->offset             = uiso->offset;
 853                 iso->length             = uiso->length;
 854                 iso->status             = uiso->status;
 855                 iso->actual_length      = uiso->actual_length;
 856         } else {
 857                 uiso->offset            = iso->offset;
 858                 uiso->length            = iso->length;
 859                 uiso->status            = iso->status;
 860                 uiso->actual_length     = iso->actual_length;
 861         }
 862 }
 863
 864
 865 /* must free buffer */
 866 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 867 {
 868         void *buff;
 869         struct usbip_iso_packet_descriptor *iso;
 870         int np = urb->number_of_packets;
 871         ssize_t size = np * sizeof(*iso);
 872         int i;
 873
 874         buff = kzalloc(size, GFP_KERNEL);
 875         if (!buff)
 876                 return NULL;
 877
 878         for (i = 0; i < np; i++) {
 879                 iso = buff + (i * sizeof(*iso));
 880
 881                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 882                 usbip_iso_pakcet_correct_endian(iso, 1);
 883         }
 884
 885         *bufflen = size;
 886
 887         return buff;
 888 }
 889 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 890
 891 /* some members of urb must be substituted before. */
 892 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 893 {
 894         void *buff;
 895         struct usbip_iso_packet_descriptor *iso;
 896         int np = urb->number_of_packets;
 897         int size = np * sizeof(*iso);
 898         int i;
 899         int ret;
 900
 901         if (!usb_pipeisoc(urb->pipe))
 902                 return 0;
 903
 904         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 905         if (np == 0) {
 906                 /* uinfo("iso np == 0\n"); */
 907                 /* usbip_dump_urb(urb); */
 908                 return 0;
 909         }
 910
 911         buff = kzalloc(size, GFP_KERNEL);
 912         if (!buff)
 913                 return -ENOMEM;
 914
 915         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 916         if (ret != size) {
 917                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 918                         ret);
 919                 kfree(buff);
 920
 921                 if (ud->side == USBIP_STUB)
 922                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 923                 else
 924                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 925
 926                 return -EPIPE;
 927         }
 928
 929         for (i = 0; i < np; i++) {
 930                 iso = buff + (i * sizeof(*iso));
 931
 932                 usbip_iso_pakcet_correct_endian(iso, 0);
 933                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 934         }
 935
 936
 937         kfree(buff);
 938
 939         return ret;
 940 }
 941 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 942
 943
 944 /* some members of urb must be substituted before. */
 945 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 946 {
 947         int ret;
 948         int size;
 949
 950         if (ud->side == USBIP_STUB) {
 951                 /* stub_rx.c */
 952                 /* the direction of urb must be OUT. */
 953                 if (usb_pipein(urb->pipe))
 954                         return 0;
 955
 956                 size = urb->transfer_buffer_length;
 957         } else {
 958                 /* vhci_rx.c */
 959                 /* the direction of urb must be IN. */
 960                 if (usb_pipeout(urb->pipe))
 961                         return 0;
 962
 963                 size = urb->actual_length;
 964         }
 965
 966         /* no need to recv xbuff */
 967         if (!(size > 0))
 968                 return 0;
 969
 970         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 971                          size, 0);
 972         if (ret != size) {
 973                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 974                 if (ud->side == USBIP_STUB) {
 975                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 976                 } else {
 977                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 978                         return -EPIPE;
 979                 }
 980         }
 981
 982         return ret;
 983 }
 984 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 985
 986
 987 /*-------------------------------------------------------------------------*/
 988
 989 static int __init usbip_common_init(void)
 990 {
 991         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
 992
 993         return 0;
 994 }
 995
 996 static void __exit usbip_common_exit(void)
 997 {
 998         return;
 999 }
1000
1001
1002
1003
1004 module_init(usbip_common_init);
1005 module_exit(usbip_common_exit);
1006
1007 MODULE_AUTHOR(DRIVER_AUTHOR);
1008 MODULE_DESCRIPTION(DRIVER_DESC);
1009 MODULE_LICENSE("GPL");