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/stat.h> 26 #include <linux/module.h> 27 #include <linux/moduleparam.h> 28 #include <net/sock.h> 29 30 #include "usbip_common.h" 31 32 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>" 33 #define DRIVER_DESC "USB/IP Core" 34 35 #ifdef CONFIG_USBIP_DEBUG 36 unsigned long usbip_debug_flag = 0xffffffff; 37 #else 38 unsigned long usbip_debug_flag; 39 #endif 40 EXPORT_SYMBOL_GPL(usbip_debug_flag); 41 module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR); 42 MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)"); 43 44 /* FIXME */ 45 struct device_attribute dev_attr_usbip_debug; 46 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug); 47 48 static ssize_t usbip_debug_show(struct device *dev, 49 struct device_attribute *attr, char *buf) 50 { 51 return sprintf(buf, "%lx\n", usbip_debug_flag); 52 } 53 54 static ssize_t usbip_debug_store(struct device *dev, 55 struct device_attribute *attr, const char *buf, 56 size_t count) 57 { 58 if (sscanf(buf, "%lx", &usbip_debug_flag) != 1) 59 return -EINVAL; 60 return count; 61 } 62 DEVICE_ATTR_RW(usbip_debug); 63 64 static void usbip_dump_buffer(char *buff, int bufflen) 65 { 66 print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4, 67 buff, bufflen, false); 68 } 69 70 static void usbip_dump_pipe(unsigned int p) 71 { 72 unsigned char type = usb_pipetype(p); 73 unsigned char ep = usb_pipeendpoint(p); 74 unsigned char dev = usb_pipedevice(p); 75 unsigned char dir = usb_pipein(p); 76 77 pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT"); 78 79 switch (type) { 80 case PIPE_ISOCHRONOUS: 81 pr_debug("ISO\n"); 82 break; 83 case PIPE_INTERRUPT: 84 pr_debug("INT\n"); 85 break; 86 case PIPE_CONTROL: 87 pr_debug("CTRL\n"); 88 break; 89 case PIPE_BULK: 90 pr_debug("BULK\n"); 91 break; 92 default: 93 pr_debug("ERR\n"); 94 break; 95 } 96 } 97 98 static void usbip_dump_usb_device(struct usb_device *udev) 99 { 100 struct device *dev = &udev->dev; 101 int i; 102 103 dev_dbg(dev, " devnum(%d) devpath(%s) usb speed(%s)", 104 udev->devnum, udev->devpath, usb_speed_string(udev->speed)); 105 106 pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport); 107 108 dev_dbg(dev, " "); 109 for (i = 0; i < 16; i++) 110 pr_debug(" %2u", i); 111 pr_debug("\n"); 112 113 dev_dbg(dev, " toggle0(IN) :"); 114 for (i = 0; i < 16; i++) 115 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0); 116 pr_debug("\n"); 117 118 dev_dbg(dev, " toggle1(OUT):"); 119 for (i = 0; i < 16; i++) 120 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0); 121 pr_debug("\n"); 122 123 dev_dbg(dev, " epmaxp_in :"); 124 for (i = 0; i < 16; i++) { 125 if (udev->ep_in[i]) 126 pr_debug(" %2u", 127 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize)); 128 } 129 pr_debug("\n"); 130 131 dev_dbg(dev, " epmaxp_out :"); 132 for (i = 0; i < 16; i++) { 133 if (udev->ep_out[i]) 134 pr_debug(" %2u", 135 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize)); 136 } 137 pr_debug("\n"); 138 139 dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus); 140 141 dev_dbg(dev, 142 "descriptor %p, config %p, actconfig %p, rawdescriptors %p\n", 143 &udev->descriptor, udev->config, 144 udev->actconfig, udev->rawdescriptors); 145 146 dev_dbg(dev, "have_langid %d, string_langid %d\n", 147 udev->have_langid, udev->string_langid); 148 149 dev_dbg(dev, "maxchild %d\n", udev->maxchild); 150 } 151 152 static void usbip_dump_request_type(__u8 rt) 153 { 154 switch (rt & USB_RECIP_MASK) { 155 case USB_RECIP_DEVICE: 156 pr_debug("DEVICE"); 157 break; 158 case USB_RECIP_INTERFACE: 159 pr_debug("INTERF"); 160 break; 161 case USB_RECIP_ENDPOINT: 162 pr_debug("ENDPOI"); 163 break; 164 case USB_RECIP_OTHER: 165 pr_debug("OTHER "); 166 break; 167 default: 168 pr_debug("------"); 169 break; 170 } 171 } 172 173 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd) 174 { 175 if (!cmd) { 176 pr_debug(" : null pointer\n"); 177 return; 178 } 179 180 pr_debug(" "); 181 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ", 182 cmd->bRequestType, cmd->bRequest, 183 cmd->wValue, cmd->wIndex, cmd->wLength); 184 pr_debug("\n "); 185 186 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { 187 pr_debug("STANDARD "); 188 switch (cmd->bRequest) { 189 case USB_REQ_GET_STATUS: 190 pr_debug("GET_STATUS\n"); 191 break; 192 case USB_REQ_CLEAR_FEATURE: 193 pr_debug("CLEAR_FEAT\n"); 194 break; 195 case USB_REQ_SET_FEATURE: 196 pr_debug("SET_FEAT\n"); 197 break; 198 case USB_REQ_SET_ADDRESS: 199 pr_debug("SET_ADDRRS\n"); 200 break; 201 case USB_REQ_GET_DESCRIPTOR: 202 pr_debug("GET_DESCRI\n"); 203 break; 204 case USB_REQ_SET_DESCRIPTOR: 205 pr_debug("SET_DESCRI\n"); 206 break; 207 case USB_REQ_GET_CONFIGURATION: 208 pr_debug("GET_CONFIG\n"); 209 break; 210 case USB_REQ_SET_CONFIGURATION: 211 pr_debug("SET_CONFIG\n"); 212 break; 213 case USB_REQ_GET_INTERFACE: 214 pr_debug("GET_INTERF\n"); 215 break; 216 case USB_REQ_SET_INTERFACE: 217 pr_debug("SET_INTERF\n"); 218 break; 219 case USB_REQ_SYNCH_FRAME: 220 pr_debug("SYNC_FRAME\n"); 221 break; 222 default: 223 pr_debug("REQ(%02X)\n", cmd->bRequest); 224 break; 225 } 226 usbip_dump_request_type(cmd->bRequestType); 227 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { 228 pr_debug("CLASS\n"); 229 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) { 230 pr_debug("VENDOR\n"); 231 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) { 232 pr_debug("RESERVED\n"); 233 } 234 } 235 236 void usbip_dump_urb(struct urb *urb) 237 { 238 struct device *dev; 239 240 if (!urb) { 241 pr_debug("urb: null pointer!!\n"); 242 return; 243 } 244 245 if (!urb->dev) { 246 pr_debug("urb->dev: null pointer!!\n"); 247 return; 248 } 249 250 dev = &urb->dev->dev; 251 252 dev_dbg(dev, " urb :%p\n", urb); 253 dev_dbg(dev, " dev :%p\n", urb->dev); 254 255 usbip_dump_usb_device(urb->dev); 256 257 dev_dbg(dev, " pipe :%08x ", urb->pipe); 258 259 usbip_dump_pipe(urb->pipe); 260 261 dev_dbg(dev, " status :%d\n", urb->status); 262 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags); 263 dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer); 264 dev_dbg(dev, " transfer_buffer_length:%d\n", 265 urb->transfer_buffer_length); 266 dev_dbg(dev, " actual_length :%d\n", urb->actual_length); 267 dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet); 268 269 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL) 270 usbip_dump_usb_ctrlrequest( 271 (struct usb_ctrlrequest *)urb->setup_packet); 272 273 dev_dbg(dev, " start_frame :%d\n", urb->start_frame); 274 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets); 275 dev_dbg(dev, " interval :%d\n", urb->interval); 276 dev_dbg(dev, " error_count :%d\n", urb->error_count); 277 dev_dbg(dev, " context :%p\n", urb->context); 278 dev_dbg(dev, " complete :%p\n", urb->complete); 279 } 280 EXPORT_SYMBOL_GPL(usbip_dump_urb); 281 282 void usbip_dump_header(struct usbip_header *pdu) 283 { 284 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n", 285 pdu->base.command, 286 pdu->base.seqnum, 287 pdu->base.devid, 288 pdu->base.direction, 289 pdu->base.ep); 290 291 switch (pdu->base.command) { 292 case USBIP_CMD_SUBMIT: 293 pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n", 294 pdu->u.cmd_submit.transfer_flags, 295 pdu->u.cmd_submit.transfer_buffer_length, 296 pdu->u.cmd_submit.start_frame, 297 pdu->u.cmd_submit.number_of_packets, 298 pdu->u.cmd_submit.interval); 299 break; 300 case USBIP_CMD_UNLINK: 301 pr_debug("USBIP_CMD_UNLINK: seq %u\n", 302 pdu->u.cmd_unlink.seqnum); 303 break; 304 case USBIP_RET_SUBMIT: 305 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n", 306 pdu->u.ret_submit.status, 307 pdu->u.ret_submit.actual_length, 308 pdu->u.ret_submit.start_frame, 309 pdu->u.ret_submit.number_of_packets, 310 pdu->u.ret_submit.error_count); 311 break; 312 case USBIP_RET_UNLINK: 313 pr_debug("USBIP_RET_UNLINK: status %d\n", 314 pdu->u.ret_unlink.status); 315 break; 316 default: 317 /* NOT REACHED */ 318 pr_err("unknown command\n"); 319 break; 320 } 321 } 322 EXPORT_SYMBOL_GPL(usbip_dump_header); 323 324 /* Receive data over TCP/IP. */ 325 int usbip_recv(struct socket *sock, void *buf, int size) 326 { 327 int result; 328 struct msghdr msg; 329 struct kvec iov; 330 int total = 0; 331 332 /* for blocks of if (usbip_dbg_flag_xmit) */ 333 char *bp = buf; 334 int osize = size; 335 336 usbip_dbg_xmit("enter\n"); 337 338 if (!sock || !buf || !size) { 339 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf, 340 size); 341 return -EINVAL; 342 } 343 344 do { 345 sock->sk->sk_allocation = GFP_NOIO; 346 iov.iov_base = buf; 347 iov.iov_len = size; 348 msg.msg_name = NULL; 349 msg.msg_namelen = 0; 350 msg.msg_control = NULL; 351 msg.msg_controllen = 0; 352 msg.msg_flags = MSG_NOSIGNAL; 353 354 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL); 355 if (result <= 0) { 356 pr_debug("receive sock %p buf %p size %u ret %d total %d\n", 357 sock, buf, size, result, total); 358 goto err; 359 } 360 361 size -= result; 362 buf += result; 363 total += result; 364 } while (size > 0); 365 366 if (usbip_dbg_flag_xmit) { 367 if (!in_interrupt()) 368 pr_debug("%-10s:", current->comm); 369 else 370 pr_debug("interrupt :"); 371 372 pr_debug("receiving....\n"); 373 usbip_dump_buffer(bp, osize); 374 pr_debug("received, osize %d ret %d size %d total %d\n", 375 osize, result, size, total); 376 } 377 378 return total; 379 380 err: 381 return result; 382 } 383 EXPORT_SYMBOL_GPL(usbip_recv); 384 385 /* there may be more cases to tweak the flags. */ 386 static unsigned int tweak_transfer_flags(unsigned int flags) 387 { 388 flags &= ~URB_NO_TRANSFER_DMA_MAP; 389 return flags; 390 } 391 392 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb, 393 int pack) 394 { 395 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit; 396 397 /* 398 * Some members are not still implemented in usbip. I hope this issue 399 * will be discussed when usbip is ported to other operating systems. 400 */ 401 if (pack) { 402 spdu->transfer_flags = 403 tweak_transfer_flags(urb->transfer_flags); 404 spdu->transfer_buffer_length = urb->transfer_buffer_length; 405 spdu->start_frame = urb->start_frame; 406 spdu->number_of_packets = urb->number_of_packets; 407 spdu->interval = urb->interval; 408 } else { 409 urb->transfer_flags = spdu->transfer_flags; 410 urb->transfer_buffer_length = spdu->transfer_buffer_length; 411 urb->start_frame = spdu->start_frame; 412 urb->number_of_packets = spdu->number_of_packets; 413 urb->interval = spdu->interval; 414 } 415 } 416 417 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb, 418 int pack) 419 { 420 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit; 421 422 if (pack) { 423 rpdu->status = urb->status; 424 rpdu->actual_length = urb->actual_length; 425 rpdu->start_frame = urb->start_frame; 426 rpdu->number_of_packets = urb->number_of_packets; 427 rpdu->error_count = urb->error_count; 428 } else { 429 urb->status = rpdu->status; 430 urb->actual_length = rpdu->actual_length; 431 urb->start_frame = rpdu->start_frame; 432 urb->number_of_packets = rpdu->number_of_packets; 433 urb->error_count = rpdu->error_count; 434 } 435 } 436 437 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd, 438 int pack) 439 { 440 switch (cmd) { 441 case USBIP_CMD_SUBMIT: 442 usbip_pack_cmd_submit(pdu, urb, pack); 443 break; 444 case USBIP_RET_SUBMIT: 445 usbip_pack_ret_submit(pdu, urb, pack); 446 break; 447 default: 448 /* NOT REACHED */ 449 pr_err("unknown command\n"); 450 break; 451 } 452 } 453 EXPORT_SYMBOL_GPL(usbip_pack_pdu); 454 455 static void correct_endian_basic(struct usbip_header_basic *base, int send) 456 { 457 if (send) { 458 base->command = cpu_to_be32(base->command); 459 base->seqnum = cpu_to_be32(base->seqnum); 460 base->devid = cpu_to_be32(base->devid); 461 base->direction = cpu_to_be32(base->direction); 462 base->ep = cpu_to_be32(base->ep); 463 } else { 464 base->command = be32_to_cpu(base->command); 465 base->seqnum = be32_to_cpu(base->seqnum); 466 base->devid = be32_to_cpu(base->devid); 467 base->direction = be32_to_cpu(base->direction); 468 base->ep = be32_to_cpu(base->ep); 469 } 470 } 471 472 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu, 473 int send) 474 { 475 if (send) { 476 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags); 477 478 cpu_to_be32s(&pdu->transfer_buffer_length); 479 cpu_to_be32s(&pdu->start_frame); 480 cpu_to_be32s(&pdu->number_of_packets); 481 cpu_to_be32s(&pdu->interval); 482 } else { 483 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags); 484 485 be32_to_cpus(&pdu->transfer_buffer_length); 486 be32_to_cpus(&pdu->start_frame); 487 be32_to_cpus(&pdu->number_of_packets); 488 be32_to_cpus(&pdu->interval); 489 } 490 } 491 492 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu, 493 int send) 494 { 495 if (send) { 496 cpu_to_be32s(&pdu->status); 497 cpu_to_be32s(&pdu->actual_length); 498 cpu_to_be32s(&pdu->start_frame); 499 cpu_to_be32s(&pdu->number_of_packets); 500 cpu_to_be32s(&pdu->error_count); 501 } else { 502 be32_to_cpus(&pdu->status); 503 be32_to_cpus(&pdu->actual_length); 504 be32_to_cpus(&pdu->start_frame); 505 be32_to_cpus(&pdu->number_of_packets); 506 be32_to_cpus(&pdu->error_count); 507 } 508 } 509 510 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu, 511 int send) 512 { 513 if (send) 514 pdu->seqnum = cpu_to_be32(pdu->seqnum); 515 else 516 pdu->seqnum = be32_to_cpu(pdu->seqnum); 517 } 518 519 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu, 520 int send) 521 { 522 if (send) 523 cpu_to_be32s(&pdu->status); 524 else 525 be32_to_cpus(&pdu->status); 526 } 527 528 void usbip_header_correct_endian(struct usbip_header *pdu, int send) 529 { 530 __u32 cmd = 0; 531 532 if (send) 533 cmd = pdu->base.command; 534 535 correct_endian_basic(&pdu->base, send); 536 537 if (!send) 538 cmd = pdu->base.command; 539 540 switch (cmd) { 541 case USBIP_CMD_SUBMIT: 542 correct_endian_cmd_submit(&pdu->u.cmd_submit, send); 543 break; 544 case USBIP_RET_SUBMIT: 545 correct_endian_ret_submit(&pdu->u.ret_submit, send); 546 break; 547 case USBIP_CMD_UNLINK: 548 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send); 549 break; 550 case USBIP_RET_UNLINK: 551 correct_endian_ret_unlink(&pdu->u.ret_unlink, send); 552 break; 553 default: 554 /* NOT REACHED */ 555 pr_err("unknown command\n"); 556 break; 557 } 558 } 559 EXPORT_SYMBOL_GPL(usbip_header_correct_endian); 560 561 static void usbip_iso_packet_correct_endian( 562 struct usbip_iso_packet_descriptor *iso, int send) 563 { 564 /* does not need all members. but copy all simply. */ 565 if (send) { 566 iso->offset = cpu_to_be32(iso->offset); 567 iso->length = cpu_to_be32(iso->length); 568 iso->status = cpu_to_be32(iso->status); 569 iso->actual_length = cpu_to_be32(iso->actual_length); 570 } else { 571 iso->offset = be32_to_cpu(iso->offset); 572 iso->length = be32_to_cpu(iso->length); 573 iso->status = be32_to_cpu(iso->status); 574 iso->actual_length = be32_to_cpu(iso->actual_length); 575 } 576 } 577 578 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso, 579 struct usb_iso_packet_descriptor *uiso, int pack) 580 { 581 if (pack) { 582 iso->offset = uiso->offset; 583 iso->length = uiso->length; 584 iso->status = uiso->status; 585 iso->actual_length = uiso->actual_length; 586 } else { 587 uiso->offset = iso->offset; 588 uiso->length = iso->length; 589 uiso->status = iso->status; 590 uiso->actual_length = iso->actual_length; 591 } 592 } 593 594 /* must free buffer */ 595 struct usbip_iso_packet_descriptor* 596 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen) 597 { 598 struct usbip_iso_packet_descriptor *iso; 599 int np = urb->number_of_packets; 600 ssize_t size = np * sizeof(*iso); 601 int i; 602 603 iso = kzalloc(size, GFP_KERNEL); 604 if (!iso) 605 return NULL; 606 607 for (i = 0; i < np; i++) { 608 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1); 609 usbip_iso_packet_correct_endian(&iso[i], 1); 610 } 611 612 *bufflen = size; 613 614 return iso; 615 } 616 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu); 617 618 /* some members of urb must be substituted before. */ 619 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb) 620 { 621 void *buff; 622 struct usbip_iso_packet_descriptor *iso; 623 int np = urb->number_of_packets; 624 int size = np * sizeof(*iso); 625 int i; 626 int ret; 627 int total_length = 0; 628 629 if (!usb_pipeisoc(urb->pipe)) 630 return 0; 631 632 /* my Bluetooth dongle gets ISO URBs which are np = 0 */ 633 if (np == 0) 634 return 0; 635 636 buff = kzalloc(size, GFP_KERNEL); 637 if (!buff) 638 return -ENOMEM; 639 640 ret = usbip_recv(ud->tcp_socket, buff, size); 641 if (ret != size) { 642 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n", 643 ret); 644 kfree(buff); 645 646 if (ud->side == USBIP_STUB) 647 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 648 else 649 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 650 651 return -EPIPE; 652 } 653 654 iso = (struct usbip_iso_packet_descriptor *) buff; 655 for (i = 0; i < np; i++) { 656 usbip_iso_packet_correct_endian(&iso[i], 0); 657 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0); 658 total_length += urb->iso_frame_desc[i].actual_length; 659 } 660 661 kfree(buff); 662 663 if (total_length != urb->actual_length) { 664 dev_err(&urb->dev->dev, 665 "total length of iso packets %d not equal to actual length of buffer %d\n", 666 total_length, urb->actual_length); 667 668 if (ud->side == USBIP_STUB) 669 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 670 else 671 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 672 673 return -EPIPE; 674 } 675 676 return ret; 677 } 678 EXPORT_SYMBOL_GPL(usbip_recv_iso); 679 680 /* 681 * This functions restores the padding which was removed for optimizing 682 * the bandwidth during transfer over tcp/ip 683 * 684 * buffer and iso packets need to be stored and be in propeper endian in urb 685 * before calling this function 686 */ 687 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb) 688 { 689 int np = urb->number_of_packets; 690 int i; 691 int actualoffset = urb->actual_length; 692 693 if (!usb_pipeisoc(urb->pipe)) 694 return; 695 696 /* if no packets or length of data is 0, then nothing to unpack */ 697 if (np == 0 || urb->actual_length == 0) 698 return; 699 700 /* 701 * if actual_length is transfer_buffer_length then no padding is 702 * present. 703 */ 704 if (urb->actual_length == urb->transfer_buffer_length) 705 return; 706 707 /* 708 * loop over all packets from last to first (to prevent overwritting 709 * memory when padding) and move them into the proper place 710 */ 711 for (i = np-1; i > 0; i--) { 712 actualoffset -= urb->iso_frame_desc[i].actual_length; 713 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset, 714 urb->transfer_buffer + actualoffset, 715 urb->iso_frame_desc[i].actual_length); 716 } 717 } 718 EXPORT_SYMBOL_GPL(usbip_pad_iso); 719 720 /* some members of urb must be substituted before. */ 721 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb) 722 { 723 int ret; 724 int size; 725 726 if (ud->side == USBIP_STUB) { 727 /* the direction of urb must be OUT. */ 728 if (usb_pipein(urb->pipe)) 729 return 0; 730 731 size = urb->transfer_buffer_length; 732 } else { 733 /* the direction of urb must be IN. */ 734 if (usb_pipeout(urb->pipe)) 735 return 0; 736 737 size = urb->actual_length; 738 } 739 740 /* no need to recv xbuff */ 741 if (!(size > 0)) 742 return 0; 743 744 if (size > urb->transfer_buffer_length) { 745 /* should not happen, probably malicious packet */ 746 if (ud->side == USBIP_STUB) { 747 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 748 return 0; 749 } else { 750 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 751 return -EPIPE; 752 } 753 } 754 755 ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size); 756 if (ret != size) { 757 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret); 758 if (ud->side == USBIP_STUB) { 759 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 760 } else { 761 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 762 return -EPIPE; 763 } 764 } 765 766 return ret; 767 } 768 EXPORT_SYMBOL_GPL(usbip_recv_xbuff); 769 770 static int __init usbip_core_init(void) 771 { 772 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n"); 773 return 0; 774 } 775 776 static void __exit usbip_core_exit(void) 777 { 778 return; 779 } 780 781 module_init(usbip_core_init); 782 module_exit(usbip_core_exit); 783 784 MODULE_AUTHOR(DRIVER_AUTHOR); 785 MODULE_DESCRIPTION(DRIVER_DESC); 786 MODULE_LICENSE("GPL"); 787 MODULE_VERSION(USBIP_VERSION); 788