1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2003-2008 Takahiro Hirofuchi 4 * Copyright (C) 2015-2016 Samsung Electronics 5 * Krzysztof Opasiak <k.opasiak@samsung.com> 6 */ 7 8 #include <asm/byteorder.h> 9 #include <linux/file.h> 10 #include <linux/fs.h> 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/stat.h> 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <net/sock.h> 17 18 #include "usbip_common.h" 19 20 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>" 21 #define DRIVER_DESC "USB/IP Core" 22 23 #ifdef CONFIG_USBIP_DEBUG 24 unsigned long usbip_debug_flag = 0xffffffff; 25 #else 26 unsigned long usbip_debug_flag; 27 #endif 28 EXPORT_SYMBOL_GPL(usbip_debug_flag); 29 module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR); 30 MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)"); 31 32 /* FIXME */ 33 struct device_attribute dev_attr_usbip_debug; 34 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug); 35 36 static ssize_t usbip_debug_show(struct device *dev, 37 struct device_attribute *attr, char *buf) 38 { 39 return sprintf(buf, "%lx\n", usbip_debug_flag); 40 } 41 42 static ssize_t usbip_debug_store(struct device *dev, 43 struct device_attribute *attr, const char *buf, 44 size_t count) 45 { 46 if (sscanf(buf, "%lx", &usbip_debug_flag) != 1) 47 return -EINVAL; 48 return count; 49 } 50 DEVICE_ATTR_RW(usbip_debug); 51 52 static void usbip_dump_buffer(char *buff, int bufflen) 53 { 54 print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4, 55 buff, bufflen, false); 56 } 57 58 static void usbip_dump_pipe(unsigned int p) 59 { 60 unsigned char type = usb_pipetype(p); 61 unsigned char ep = usb_pipeendpoint(p); 62 unsigned char dev = usb_pipedevice(p); 63 unsigned char dir = usb_pipein(p); 64 65 pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT"); 66 67 switch (type) { 68 case PIPE_ISOCHRONOUS: 69 pr_debug("ISO\n"); 70 break; 71 case PIPE_INTERRUPT: 72 pr_debug("INT\n"); 73 break; 74 case PIPE_CONTROL: 75 pr_debug("CTRL\n"); 76 break; 77 case PIPE_BULK: 78 pr_debug("BULK\n"); 79 break; 80 default: 81 pr_debug("ERR\n"); 82 break; 83 } 84 } 85 86 static void usbip_dump_usb_device(struct usb_device *udev) 87 { 88 struct device *dev = &udev->dev; 89 int i; 90 91 dev_dbg(dev, " devnum(%d) devpath(%s) usb speed(%s)", 92 udev->devnum, udev->devpath, usb_speed_string(udev->speed)); 93 94 pr_debug("tt hub ttport %d\n", udev->ttport); 95 96 dev_dbg(dev, " "); 97 for (i = 0; i < 16; i++) 98 pr_debug(" %2u", i); 99 pr_debug("\n"); 100 101 dev_dbg(dev, " toggle0(IN) :"); 102 for (i = 0; i < 16; i++) 103 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0); 104 pr_debug("\n"); 105 106 dev_dbg(dev, " toggle1(OUT):"); 107 for (i = 0; i < 16; i++) 108 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0); 109 pr_debug("\n"); 110 111 dev_dbg(dev, " epmaxp_in :"); 112 for (i = 0; i < 16; i++) { 113 if (udev->ep_in[i]) 114 pr_debug(" %2u", 115 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize)); 116 } 117 pr_debug("\n"); 118 119 dev_dbg(dev, " epmaxp_out :"); 120 for (i = 0; i < 16; i++) { 121 if (udev->ep_out[i]) 122 pr_debug(" %2u", 123 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize)); 124 } 125 pr_debug("\n"); 126 127 dev_dbg(dev, "parent %s, bus %s\n", dev_name(&udev->parent->dev), 128 udev->bus->bus_name); 129 130 dev_dbg(dev, "have_langid %d, string_langid %d\n", 131 udev->have_langid, udev->string_langid); 132 133 dev_dbg(dev, "maxchild %d\n", udev->maxchild); 134 } 135 136 static void usbip_dump_request_type(__u8 rt) 137 { 138 switch (rt & USB_RECIP_MASK) { 139 case USB_RECIP_DEVICE: 140 pr_debug("DEVICE"); 141 break; 142 case USB_RECIP_INTERFACE: 143 pr_debug("INTERF"); 144 break; 145 case USB_RECIP_ENDPOINT: 146 pr_debug("ENDPOI"); 147 break; 148 case USB_RECIP_OTHER: 149 pr_debug("OTHER "); 150 break; 151 default: 152 pr_debug("------"); 153 break; 154 } 155 } 156 157 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd) 158 { 159 if (!cmd) { 160 pr_debug(" : null pointer\n"); 161 return; 162 } 163 164 pr_debug(" "); 165 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ", 166 cmd->bRequestType, cmd->bRequest, 167 cmd->wValue, cmd->wIndex, cmd->wLength); 168 pr_debug("\n "); 169 170 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { 171 pr_debug("STANDARD "); 172 switch (cmd->bRequest) { 173 case USB_REQ_GET_STATUS: 174 pr_debug("GET_STATUS\n"); 175 break; 176 case USB_REQ_CLEAR_FEATURE: 177 pr_debug("CLEAR_FEAT\n"); 178 break; 179 case USB_REQ_SET_FEATURE: 180 pr_debug("SET_FEAT\n"); 181 break; 182 case USB_REQ_SET_ADDRESS: 183 pr_debug("SET_ADDRRS\n"); 184 break; 185 case USB_REQ_GET_DESCRIPTOR: 186 pr_debug("GET_DESCRI\n"); 187 break; 188 case USB_REQ_SET_DESCRIPTOR: 189 pr_debug("SET_DESCRI\n"); 190 break; 191 case USB_REQ_GET_CONFIGURATION: 192 pr_debug("GET_CONFIG\n"); 193 break; 194 case USB_REQ_SET_CONFIGURATION: 195 pr_debug("SET_CONFIG\n"); 196 break; 197 case USB_REQ_GET_INTERFACE: 198 pr_debug("GET_INTERF\n"); 199 break; 200 case USB_REQ_SET_INTERFACE: 201 pr_debug("SET_INTERF\n"); 202 break; 203 case USB_REQ_SYNCH_FRAME: 204 pr_debug("SYNC_FRAME\n"); 205 break; 206 default: 207 pr_debug("REQ(%02X)\n", cmd->bRequest); 208 break; 209 } 210 usbip_dump_request_type(cmd->bRequestType); 211 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { 212 pr_debug("CLASS\n"); 213 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) { 214 pr_debug("VENDOR\n"); 215 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) { 216 pr_debug("RESERVED\n"); 217 } 218 } 219 220 void usbip_dump_urb(struct urb *urb) 221 { 222 struct device *dev; 223 224 if (!urb) { 225 pr_debug("urb: null pointer!!\n"); 226 return; 227 } 228 229 if (!urb->dev) { 230 pr_debug("urb->dev: null pointer!!\n"); 231 return; 232 } 233 234 dev = &urb->dev->dev; 235 236 usbip_dump_usb_device(urb->dev); 237 238 dev_dbg(dev, " pipe :%08x ", urb->pipe); 239 240 usbip_dump_pipe(urb->pipe); 241 242 dev_dbg(dev, " status :%d\n", urb->status); 243 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags); 244 dev_dbg(dev, " transfer_buffer_length:%d\n", 245 urb->transfer_buffer_length); 246 dev_dbg(dev, " actual_length :%d\n", urb->actual_length); 247 248 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL) 249 usbip_dump_usb_ctrlrequest( 250 (struct usb_ctrlrequest *)urb->setup_packet); 251 252 dev_dbg(dev, " start_frame :%d\n", urb->start_frame); 253 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets); 254 dev_dbg(dev, " interval :%d\n", urb->interval); 255 dev_dbg(dev, " error_count :%d\n", urb->error_count); 256 } 257 EXPORT_SYMBOL_GPL(usbip_dump_urb); 258 259 void usbip_dump_header(struct usbip_header *pdu) 260 { 261 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n", 262 pdu->base.command, 263 pdu->base.seqnum, 264 pdu->base.devid, 265 pdu->base.direction, 266 pdu->base.ep); 267 268 switch (pdu->base.command) { 269 case USBIP_CMD_SUBMIT: 270 pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n", 271 pdu->u.cmd_submit.transfer_flags, 272 pdu->u.cmd_submit.transfer_buffer_length, 273 pdu->u.cmd_submit.start_frame, 274 pdu->u.cmd_submit.number_of_packets, 275 pdu->u.cmd_submit.interval); 276 break; 277 case USBIP_CMD_UNLINK: 278 pr_debug("USBIP_CMD_UNLINK: seq %u\n", 279 pdu->u.cmd_unlink.seqnum); 280 break; 281 case USBIP_RET_SUBMIT: 282 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n", 283 pdu->u.ret_submit.status, 284 pdu->u.ret_submit.actual_length, 285 pdu->u.ret_submit.start_frame, 286 pdu->u.ret_submit.number_of_packets, 287 pdu->u.ret_submit.error_count); 288 break; 289 case USBIP_RET_UNLINK: 290 pr_debug("USBIP_RET_UNLINK: status %d\n", 291 pdu->u.ret_unlink.status); 292 break; 293 default: 294 /* NOT REACHED */ 295 pr_err("unknown command\n"); 296 break; 297 } 298 } 299 EXPORT_SYMBOL_GPL(usbip_dump_header); 300 301 /* Receive data over TCP/IP. */ 302 int usbip_recv(struct socket *sock, void *buf, int size) 303 { 304 int result; 305 struct kvec iov = {.iov_base = buf, .iov_len = size}; 306 struct msghdr msg = {.msg_flags = MSG_NOSIGNAL}; 307 int total = 0; 308 309 if (!sock || !buf || !size) 310 return -EINVAL; 311 312 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size); 313 314 usbip_dbg_xmit("enter\n"); 315 316 do { 317 sock->sk->sk_allocation = GFP_NOIO; 318 319 result = sock_recvmsg(sock, &msg, MSG_WAITALL); 320 if (result <= 0) 321 goto err; 322 323 total += result; 324 } while (msg_data_left(&msg)); 325 326 if (usbip_dbg_flag_xmit) { 327 pr_debug("receiving....\n"); 328 usbip_dump_buffer(buf, size); 329 pr_debug("received, osize %d ret %d size %zd total %d\n", 330 size, result, msg_data_left(&msg), total); 331 } 332 333 return total; 334 335 err: 336 return result; 337 } 338 EXPORT_SYMBOL_GPL(usbip_recv); 339 340 /* there may be more cases to tweak the flags. */ 341 static unsigned int tweak_transfer_flags(unsigned int flags) 342 { 343 flags &= ~URB_NO_TRANSFER_DMA_MAP; 344 return flags; 345 } 346 347 /* 348 * USBIP driver packs URB transfer flags in PDUs that are exchanged 349 * between Server (usbip_host) and Client (vhci_hcd). URB_* flags 350 * are internal to kernel and could change. Where as USBIP URB flags 351 * exchanged in PDUs are USBIP user API must not change. 352 * 353 * USBIP_URB* flags are exported as explicit API and client and server 354 * do mapping from kernel flags to USBIP_URB*. Details as follows: 355 * 356 * Client tx path (USBIP_CMD_SUBMIT): 357 * - Maps URB_* to USBIP_URB_* when it sends USBIP_CMD_SUBMIT packet. 358 * 359 * Server rx path (USBIP_CMD_SUBMIT): 360 * - Maps USBIP_URB_* to URB_* when it receives USBIP_CMD_SUBMIT packet. 361 * 362 * Flags aren't included in USBIP_CMD_UNLINK and USBIP_RET_SUBMIT packets 363 * and no special handling is needed for them in the following cases: 364 * - Server rx path (USBIP_CMD_UNLINK) 365 * - Client rx path & Server tx path (USBIP_RET_SUBMIT) 366 * 367 * Code paths: 368 * usbip_pack_pdu() is the common routine that handles packing pdu from 369 * urb and unpack pdu to an urb. 370 * 371 * usbip_pack_cmd_submit() and usbip_pack_ret_submit() handle 372 * USBIP_CMD_SUBMIT and USBIP_RET_SUBMIT respectively. 373 * 374 * usbip_map_urb_to_usbip() and usbip_map_usbip_to_urb() are used 375 * by usbip_pack_cmd_submit() and usbip_pack_ret_submit() to map 376 * flags. 377 */ 378 379 struct urb_to_usbip_flags { 380 u32 urb_flag; 381 u32 usbip_flag; 382 }; 383 384 #define NUM_USBIP_FLAGS 17 385 386 static const struct urb_to_usbip_flags flag_map[NUM_USBIP_FLAGS] = { 387 {URB_SHORT_NOT_OK, USBIP_URB_SHORT_NOT_OK}, 388 {URB_ISO_ASAP, USBIP_URB_ISO_ASAP}, 389 {URB_NO_TRANSFER_DMA_MAP, USBIP_URB_NO_TRANSFER_DMA_MAP}, 390 {URB_ZERO_PACKET, USBIP_URB_ZERO_PACKET}, 391 {URB_NO_INTERRUPT, USBIP_URB_NO_INTERRUPT}, 392 {URB_FREE_BUFFER, USBIP_URB_FREE_BUFFER}, 393 {URB_DIR_IN, USBIP_URB_DIR_IN}, 394 {URB_DIR_OUT, USBIP_URB_DIR_OUT}, 395 {URB_DIR_MASK, USBIP_URB_DIR_MASK}, 396 {URB_DMA_MAP_SINGLE, USBIP_URB_DMA_MAP_SINGLE}, 397 {URB_DMA_MAP_PAGE, USBIP_URB_DMA_MAP_PAGE}, 398 {URB_DMA_MAP_SG, USBIP_URB_DMA_MAP_SG}, 399 {URB_MAP_LOCAL, USBIP_URB_MAP_LOCAL}, 400 {URB_SETUP_MAP_SINGLE, USBIP_URB_SETUP_MAP_SINGLE}, 401 {URB_SETUP_MAP_LOCAL, USBIP_URB_SETUP_MAP_LOCAL}, 402 {URB_DMA_SG_COMBINED, USBIP_URB_DMA_SG_COMBINED}, 403 {URB_ALIGNED_TEMP_BUFFER, USBIP_URB_ALIGNED_TEMP_BUFFER}, 404 }; 405 406 static unsigned int urb_to_usbip(unsigned int flags) 407 { 408 unsigned int map_flags = 0; 409 int loop; 410 411 for (loop = 0; loop < NUM_USBIP_FLAGS; loop++) { 412 if (flags & flag_map[loop].urb_flag) 413 map_flags |= flag_map[loop].usbip_flag; 414 } 415 416 return map_flags; 417 } 418 419 static unsigned int usbip_to_urb(unsigned int flags) 420 { 421 unsigned int map_flags = 0; 422 int loop; 423 424 for (loop = 0; loop < NUM_USBIP_FLAGS; loop++) { 425 if (flags & flag_map[loop].usbip_flag) 426 map_flags |= flag_map[loop].urb_flag; 427 } 428 429 return map_flags; 430 } 431 432 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb, 433 int pack) 434 { 435 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit; 436 437 /* 438 * Some members are not still implemented in usbip. I hope this issue 439 * will be discussed when usbip is ported to other operating systems. 440 */ 441 if (pack) { 442 /* map after tweaking the urb flags */ 443 spdu->transfer_flags = urb_to_usbip(tweak_transfer_flags(urb->transfer_flags)); 444 spdu->transfer_buffer_length = urb->transfer_buffer_length; 445 spdu->start_frame = urb->start_frame; 446 spdu->number_of_packets = urb->number_of_packets; 447 spdu->interval = urb->interval; 448 } else { 449 urb->transfer_flags = usbip_to_urb(spdu->transfer_flags); 450 urb->transfer_buffer_length = spdu->transfer_buffer_length; 451 urb->start_frame = spdu->start_frame; 452 urb->number_of_packets = spdu->number_of_packets; 453 urb->interval = spdu->interval; 454 } 455 } 456 457 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb, 458 int pack) 459 { 460 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit; 461 462 if (pack) { 463 rpdu->status = urb->status; 464 rpdu->actual_length = urb->actual_length; 465 rpdu->start_frame = urb->start_frame; 466 rpdu->number_of_packets = urb->number_of_packets; 467 rpdu->error_count = urb->error_count; 468 } else { 469 urb->status = rpdu->status; 470 urb->actual_length = rpdu->actual_length; 471 urb->start_frame = rpdu->start_frame; 472 urb->number_of_packets = rpdu->number_of_packets; 473 urb->error_count = rpdu->error_count; 474 } 475 } 476 477 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd, 478 int pack) 479 { 480 switch (cmd) { 481 case USBIP_CMD_SUBMIT: 482 usbip_pack_cmd_submit(pdu, urb, pack); 483 break; 484 case USBIP_RET_SUBMIT: 485 usbip_pack_ret_submit(pdu, urb, pack); 486 break; 487 default: 488 /* NOT REACHED */ 489 pr_err("unknown command\n"); 490 break; 491 } 492 } 493 EXPORT_SYMBOL_GPL(usbip_pack_pdu); 494 495 static void correct_endian_basic(struct usbip_header_basic *base, int send) 496 { 497 if (send) { 498 base->command = cpu_to_be32(base->command); 499 base->seqnum = cpu_to_be32(base->seqnum); 500 base->devid = cpu_to_be32(base->devid); 501 base->direction = cpu_to_be32(base->direction); 502 base->ep = cpu_to_be32(base->ep); 503 } else { 504 base->command = be32_to_cpu(base->command); 505 base->seqnum = be32_to_cpu(base->seqnum); 506 base->devid = be32_to_cpu(base->devid); 507 base->direction = be32_to_cpu(base->direction); 508 base->ep = be32_to_cpu(base->ep); 509 } 510 } 511 512 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu, 513 int send) 514 { 515 if (send) { 516 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags); 517 518 cpu_to_be32s(&pdu->transfer_buffer_length); 519 cpu_to_be32s(&pdu->start_frame); 520 cpu_to_be32s(&pdu->number_of_packets); 521 cpu_to_be32s(&pdu->interval); 522 } else { 523 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags); 524 525 be32_to_cpus(&pdu->transfer_buffer_length); 526 be32_to_cpus(&pdu->start_frame); 527 be32_to_cpus(&pdu->number_of_packets); 528 be32_to_cpus(&pdu->interval); 529 } 530 } 531 532 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu, 533 int send) 534 { 535 if (send) { 536 cpu_to_be32s(&pdu->status); 537 cpu_to_be32s(&pdu->actual_length); 538 cpu_to_be32s(&pdu->start_frame); 539 cpu_to_be32s(&pdu->number_of_packets); 540 cpu_to_be32s(&pdu->error_count); 541 } else { 542 be32_to_cpus(&pdu->status); 543 be32_to_cpus(&pdu->actual_length); 544 be32_to_cpus(&pdu->start_frame); 545 be32_to_cpus(&pdu->number_of_packets); 546 be32_to_cpus(&pdu->error_count); 547 } 548 } 549 550 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu, 551 int send) 552 { 553 if (send) 554 pdu->seqnum = cpu_to_be32(pdu->seqnum); 555 else 556 pdu->seqnum = be32_to_cpu(pdu->seqnum); 557 } 558 559 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu, 560 int send) 561 { 562 if (send) 563 cpu_to_be32s(&pdu->status); 564 else 565 be32_to_cpus(&pdu->status); 566 } 567 568 void usbip_header_correct_endian(struct usbip_header *pdu, int send) 569 { 570 __u32 cmd = 0; 571 572 if (send) 573 cmd = pdu->base.command; 574 575 correct_endian_basic(&pdu->base, send); 576 577 if (!send) 578 cmd = pdu->base.command; 579 580 switch (cmd) { 581 case USBIP_CMD_SUBMIT: 582 correct_endian_cmd_submit(&pdu->u.cmd_submit, send); 583 break; 584 case USBIP_RET_SUBMIT: 585 correct_endian_ret_submit(&pdu->u.ret_submit, send); 586 break; 587 case USBIP_CMD_UNLINK: 588 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send); 589 break; 590 case USBIP_RET_UNLINK: 591 correct_endian_ret_unlink(&pdu->u.ret_unlink, send); 592 break; 593 default: 594 /* NOT REACHED */ 595 pr_err("unknown command\n"); 596 break; 597 } 598 } 599 EXPORT_SYMBOL_GPL(usbip_header_correct_endian); 600 601 static void usbip_iso_packet_correct_endian( 602 struct usbip_iso_packet_descriptor *iso, int send) 603 { 604 /* does not need all members. but copy all simply. */ 605 if (send) { 606 iso->offset = cpu_to_be32(iso->offset); 607 iso->length = cpu_to_be32(iso->length); 608 iso->status = cpu_to_be32(iso->status); 609 iso->actual_length = cpu_to_be32(iso->actual_length); 610 } else { 611 iso->offset = be32_to_cpu(iso->offset); 612 iso->length = be32_to_cpu(iso->length); 613 iso->status = be32_to_cpu(iso->status); 614 iso->actual_length = be32_to_cpu(iso->actual_length); 615 } 616 } 617 618 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso, 619 struct usb_iso_packet_descriptor *uiso, int pack) 620 { 621 if (pack) { 622 iso->offset = uiso->offset; 623 iso->length = uiso->length; 624 iso->status = uiso->status; 625 iso->actual_length = uiso->actual_length; 626 } else { 627 uiso->offset = iso->offset; 628 uiso->length = iso->length; 629 uiso->status = iso->status; 630 uiso->actual_length = iso->actual_length; 631 } 632 } 633 634 /* must free buffer */ 635 struct usbip_iso_packet_descriptor* 636 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen) 637 { 638 struct usbip_iso_packet_descriptor *iso; 639 int np = urb->number_of_packets; 640 ssize_t size = np * sizeof(*iso); 641 int i; 642 643 iso = kzalloc(size, GFP_KERNEL); 644 if (!iso) 645 return NULL; 646 647 for (i = 0; i < np; i++) { 648 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1); 649 usbip_iso_packet_correct_endian(&iso[i], 1); 650 } 651 652 *bufflen = size; 653 654 return iso; 655 } 656 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu); 657 658 /* some members of urb must be substituted before. */ 659 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb) 660 { 661 void *buff; 662 struct usbip_iso_packet_descriptor *iso; 663 int np = urb->number_of_packets; 664 int size = np * sizeof(*iso); 665 int i; 666 int ret; 667 int total_length = 0; 668 669 if (!usb_pipeisoc(urb->pipe)) 670 return 0; 671 672 /* my Bluetooth dongle gets ISO URBs which are np = 0 */ 673 if (np == 0) 674 return 0; 675 676 buff = kzalloc(size, GFP_KERNEL); 677 if (!buff) 678 return -ENOMEM; 679 680 ret = usbip_recv(ud->tcp_socket, buff, size); 681 if (ret != size) { 682 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n", 683 ret); 684 kfree(buff); 685 686 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) 687 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 688 else 689 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 690 691 return -EPIPE; 692 } 693 694 iso = (struct usbip_iso_packet_descriptor *) buff; 695 for (i = 0; i < np; i++) { 696 usbip_iso_packet_correct_endian(&iso[i], 0); 697 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0); 698 total_length += urb->iso_frame_desc[i].actual_length; 699 } 700 701 kfree(buff); 702 703 if (total_length != urb->actual_length) { 704 dev_err(&urb->dev->dev, 705 "total length of iso packets %d not equal to actual length of buffer %d\n", 706 total_length, urb->actual_length); 707 708 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) 709 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 710 else 711 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 712 713 return -EPIPE; 714 } 715 716 return ret; 717 } 718 EXPORT_SYMBOL_GPL(usbip_recv_iso); 719 720 /* 721 * This functions restores the padding which was removed for optimizing 722 * the bandwidth during transfer over tcp/ip 723 * 724 * buffer and iso packets need to be stored and be in propeper endian in urb 725 * before calling this function 726 */ 727 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb) 728 { 729 int np = urb->number_of_packets; 730 int i; 731 int actualoffset = urb->actual_length; 732 733 if (!usb_pipeisoc(urb->pipe)) 734 return; 735 736 /* if no packets or length of data is 0, then nothing to unpack */ 737 if (np == 0 || urb->actual_length == 0) 738 return; 739 740 /* 741 * if actual_length is transfer_buffer_length then no padding is 742 * present. 743 */ 744 if (urb->actual_length == urb->transfer_buffer_length) 745 return; 746 747 /* 748 * loop over all packets from last to first (to prevent overwriting 749 * memory when padding) and move them into the proper place 750 */ 751 for (i = np-1; i > 0; i--) { 752 actualoffset -= urb->iso_frame_desc[i].actual_length; 753 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset, 754 urb->transfer_buffer + actualoffset, 755 urb->iso_frame_desc[i].actual_length); 756 } 757 } 758 EXPORT_SYMBOL_GPL(usbip_pad_iso); 759 760 /* some members of urb must be substituted before. */ 761 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb) 762 { 763 struct scatterlist *sg; 764 int ret = 0; 765 int recv; 766 int size; 767 int copy; 768 int i; 769 770 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) { 771 /* the direction of urb must be OUT. */ 772 if (usb_pipein(urb->pipe)) 773 return 0; 774 775 size = urb->transfer_buffer_length; 776 } else { 777 /* the direction of urb must be IN. */ 778 if (usb_pipeout(urb->pipe)) 779 return 0; 780 781 size = urb->actual_length; 782 } 783 784 /* no need to recv xbuff */ 785 if (!(size > 0)) 786 return 0; 787 788 if (size > urb->transfer_buffer_length) 789 /* should not happen, probably malicious packet */ 790 goto error; 791 792 if (urb->num_sgs) { 793 copy = size; 794 for_each_sg(urb->sg, sg, urb->num_sgs, i) { 795 int recv_size; 796 797 if (copy < sg->length) 798 recv_size = copy; 799 else 800 recv_size = sg->length; 801 802 recv = usbip_recv(ud->tcp_socket, sg_virt(sg), 803 recv_size); 804 805 if (recv != recv_size) 806 goto error; 807 808 copy -= recv; 809 ret += recv; 810 811 if (!copy) 812 break; 813 } 814 815 if (ret != size) 816 goto error; 817 } else { 818 ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size); 819 if (ret != size) 820 goto error; 821 } 822 823 return ret; 824 825 error: 826 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret); 827 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) 828 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); 829 else 830 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 831 832 return -EPIPE; 833 } 834 EXPORT_SYMBOL_GPL(usbip_recv_xbuff); 835 836 static int __init usbip_core_init(void) 837 { 838 return usbip_init_eh(); 839 } 840 841 static void __exit usbip_core_exit(void) 842 { 843 usbip_finish_eh(); 844 return; 845 } 846 847 module_init(usbip_core_init); 848 module_exit(usbip_core_exit); 849 850 MODULE_AUTHOR(DRIVER_AUTHOR); 851 MODULE_DESCRIPTION(DRIVER_DESC); 852 MODULE_LICENSE("GPL"); 853