1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * RNDIS MSG parser 4 * 5 * Authors: Benedikt Spranger, Pengutronix 6 * Robert Schwebel, Pengutronix 7 * 8 * This software was originally developed in conformance with 9 * Microsoft's Remote NDIS Specification License Agreement. 10 * 11 * 03/12/2004 Kai-Uwe Bloem <linux-development@auerswald.de> 12 * Fixed message length bug in init_response 13 * 14 * 03/25/2004 Kai-Uwe Bloem <linux-development@auerswald.de> 15 * Fixed rndis_rm_hdr length bug. 16 * 17 * Copyright (C) 2004 by David Brownell 18 * updates to merge with Linux 2.6, better match RNDIS spec 19 */ 20 21 #include <linux/module.h> 22 #include <linux/moduleparam.h> 23 #include <linux/kernel.h> 24 #include <linux/errno.h> 25 #include <linux/idr.h> 26 #include <linux/list.h> 27 #include <linux/proc_fs.h> 28 #include <linux/slab.h> 29 #include <linux/seq_file.h> 30 #include <linux/netdevice.h> 31 32 #include <asm/io.h> 33 #include <asm/byteorder.h> 34 #include <linux/unaligned.h> 35 36 #include "u_rndis.h" 37 38 #undef VERBOSE_DEBUG 39 40 #include "rndis.h" 41 42 43 /* The driver for your USB chip needs to support ep0 OUT to work with 44 * RNDIS, plus all three CDC Ethernet endpoints (interrupt not optional). 45 * 46 * Windows hosts need an INF file like Documentation/usb/linux.inf 47 * and will be happier if you provide the host_addr module parameter. 48 */ 49 50 #if 0 51 static int rndis_debug = 0; 52 module_param (rndis_debug, int, 0); 53 MODULE_PARM_DESC (rndis_debug, "enable debugging"); 54 #else 55 #define rndis_debug 0 56 #endif 57 58 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 59 60 #define NAME_TEMPLATE "driver/rndis-%03d" 61 62 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */ 63 64 static DEFINE_IDA(rndis_ida); 65 66 /* Driver Version */ 67 static const __le32 rndis_driver_version = cpu_to_le32(1); 68 69 /* Function Prototypes */ 70 static rndis_resp_t *rndis_add_response(struct rndis_params *params, 71 u32 length); 72 73 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 74 75 static const struct proc_ops rndis_proc_ops; 76 77 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */ 78 79 /* supported OIDs */ 80 static const u32 oid_supported_list[] = { 81 /* the general stuff */ 82 RNDIS_OID_GEN_SUPPORTED_LIST, 83 RNDIS_OID_GEN_HARDWARE_STATUS, 84 RNDIS_OID_GEN_MEDIA_SUPPORTED, 85 RNDIS_OID_GEN_MEDIA_IN_USE, 86 RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE, 87 RNDIS_OID_GEN_LINK_SPEED, 88 RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE, 89 RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE, 90 RNDIS_OID_GEN_VENDOR_ID, 91 RNDIS_OID_GEN_VENDOR_DESCRIPTION, 92 RNDIS_OID_GEN_VENDOR_DRIVER_VERSION, 93 RNDIS_OID_GEN_CURRENT_PACKET_FILTER, 94 RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE, 95 RNDIS_OID_GEN_MEDIA_CONNECT_STATUS, 96 RNDIS_OID_GEN_PHYSICAL_MEDIUM, 97 98 /* the statistical stuff */ 99 RNDIS_OID_GEN_XMIT_OK, 100 RNDIS_OID_GEN_RCV_OK, 101 RNDIS_OID_GEN_XMIT_ERROR, 102 RNDIS_OID_GEN_RCV_ERROR, 103 RNDIS_OID_GEN_RCV_NO_BUFFER, 104 #ifdef RNDIS_OPTIONAL_STATS 105 RNDIS_OID_GEN_DIRECTED_BYTES_XMIT, 106 RNDIS_OID_GEN_DIRECTED_FRAMES_XMIT, 107 RNDIS_OID_GEN_MULTICAST_BYTES_XMIT, 108 RNDIS_OID_GEN_MULTICAST_FRAMES_XMIT, 109 RNDIS_OID_GEN_BROADCAST_BYTES_XMIT, 110 RNDIS_OID_GEN_BROADCAST_FRAMES_XMIT, 111 RNDIS_OID_GEN_DIRECTED_BYTES_RCV, 112 RNDIS_OID_GEN_DIRECTED_FRAMES_RCV, 113 RNDIS_OID_GEN_MULTICAST_BYTES_RCV, 114 RNDIS_OID_GEN_MULTICAST_FRAMES_RCV, 115 RNDIS_OID_GEN_BROADCAST_BYTES_RCV, 116 RNDIS_OID_GEN_BROADCAST_FRAMES_RCV, 117 RNDIS_OID_GEN_RCV_CRC_ERROR, 118 RNDIS_OID_GEN_TRANSMIT_QUEUE_LENGTH, 119 #endif /* RNDIS_OPTIONAL_STATS */ 120 121 /* mandatory 802.3 */ 122 /* the general stuff */ 123 RNDIS_OID_802_3_PERMANENT_ADDRESS, 124 RNDIS_OID_802_3_CURRENT_ADDRESS, 125 RNDIS_OID_802_3_MULTICAST_LIST, 126 RNDIS_OID_802_3_MAC_OPTIONS, 127 RNDIS_OID_802_3_MAXIMUM_LIST_SIZE, 128 129 /* the statistical stuff */ 130 RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT, 131 RNDIS_OID_802_3_XMIT_ONE_COLLISION, 132 RNDIS_OID_802_3_XMIT_MORE_COLLISIONS, 133 #ifdef RNDIS_OPTIONAL_STATS 134 RNDIS_OID_802_3_XMIT_DEFERRED, 135 RNDIS_OID_802_3_XMIT_MAX_COLLISIONS, 136 RNDIS_OID_802_3_RCV_OVERRUN, 137 RNDIS_OID_802_3_XMIT_UNDERRUN, 138 RNDIS_OID_802_3_XMIT_HEARTBEAT_FAILURE, 139 RNDIS_OID_802_3_XMIT_TIMES_CRS_LOST, 140 RNDIS_OID_802_3_XMIT_LATE_COLLISIONS, 141 #endif /* RNDIS_OPTIONAL_STATS */ 142 143 #ifdef RNDIS_PM 144 /* PM and wakeup are "mandatory" for USB, but the RNDIS specs 145 * don't say what they mean ... and the NDIS specs are often 146 * confusing and/or ambiguous in this context. (That is, more 147 * so than their specs for the other OIDs.) 148 * 149 * FIXME someone who knows what these should do, please 150 * implement them! 151 */ 152 153 /* power management */ 154 OID_PNP_CAPABILITIES, 155 OID_PNP_QUERY_POWER, 156 OID_PNP_SET_POWER, 157 158 #ifdef RNDIS_WAKEUP 159 /* wake up host */ 160 OID_PNP_ENABLE_WAKE_UP, 161 OID_PNP_ADD_WAKE_UP_PATTERN, 162 OID_PNP_REMOVE_WAKE_UP_PATTERN, 163 #endif /* RNDIS_WAKEUP */ 164 #endif /* RNDIS_PM */ 165 }; 166 167 168 /* NDIS Functions */ 169 static int gen_ndis_query_resp(struct rndis_params *params, u32 OID, u8 *buf, 170 unsigned buf_len, rndis_resp_t *r) 171 { 172 int retval = -ENOTSUPP; 173 u32 length = 4; /* usually */ 174 __le32 *outbuf; 175 int i, count; 176 rndis_query_cmplt_type *resp; 177 struct net_device *net; 178 struct rtnl_link_stats64 temp; 179 const struct rtnl_link_stats64 *stats; 180 181 if (!r) return -ENOMEM; 182 resp = (rndis_query_cmplt_type *)r->buf; 183 184 if (!resp) return -ENOMEM; 185 186 if (buf_len && rndis_debug > 1) { 187 pr_debug("query OID %08x value, len %d:\n", OID, buf_len); 188 for (i = 0; i < buf_len; i += 16) { 189 pr_debug("%03d: %08x %08x %08x %08x\n", i, 190 get_unaligned_le32(&buf[i]), 191 get_unaligned_le32(&buf[i + 4]), 192 get_unaligned_le32(&buf[i + 8]), 193 get_unaligned_le32(&buf[i + 12])); 194 } 195 } 196 197 /* response goes here, right after the header */ 198 outbuf = (__le32 *)&resp[1]; 199 resp->InformationBufferOffset = cpu_to_le32(16); 200 201 net = params->dev; 202 stats = dev_get_stats(net, &temp); 203 204 switch (OID) { 205 206 /* general oids (table 4-1) */ 207 208 /* mandatory */ 209 case RNDIS_OID_GEN_SUPPORTED_LIST: 210 pr_debug("%s: RNDIS_OID_GEN_SUPPORTED_LIST\n", __func__); 211 length = sizeof(oid_supported_list); 212 count = length / sizeof(u32); 213 for (i = 0; i < count; i++) 214 outbuf[i] = cpu_to_le32(oid_supported_list[i]); 215 retval = 0; 216 break; 217 218 /* mandatory */ 219 case RNDIS_OID_GEN_HARDWARE_STATUS: 220 pr_debug("%s: RNDIS_OID_GEN_HARDWARE_STATUS\n", __func__); 221 /* Bogus question! 222 * Hardware must be ready to receive high level protocols. 223 * BTW: 224 * reddite ergo quae sunt Caesaris Caesari 225 * et quae sunt Dei Deo! 226 */ 227 *outbuf = cpu_to_le32(0); 228 retval = 0; 229 break; 230 231 /* mandatory */ 232 case RNDIS_OID_GEN_MEDIA_SUPPORTED: 233 pr_debug("%s: RNDIS_OID_GEN_MEDIA_SUPPORTED\n", __func__); 234 *outbuf = cpu_to_le32(params->medium); 235 retval = 0; 236 break; 237 238 /* mandatory */ 239 case RNDIS_OID_GEN_MEDIA_IN_USE: 240 pr_debug("%s: RNDIS_OID_GEN_MEDIA_IN_USE\n", __func__); 241 /* one medium, one transport... (maybe you do it better) */ 242 *outbuf = cpu_to_le32(params->medium); 243 retval = 0; 244 break; 245 246 /* mandatory */ 247 case RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE: 248 pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE\n", __func__); 249 if (params->dev) { 250 *outbuf = cpu_to_le32(params->dev->mtu); 251 retval = 0; 252 } 253 break; 254 255 /* mandatory */ 256 case RNDIS_OID_GEN_LINK_SPEED: 257 if (rndis_debug > 1) 258 pr_debug("%s: RNDIS_OID_GEN_LINK_SPEED\n", __func__); 259 if (params->media_state == RNDIS_MEDIA_STATE_DISCONNECTED) 260 *outbuf = cpu_to_le32(0); 261 else 262 *outbuf = cpu_to_le32(params->speed); 263 retval = 0; 264 break; 265 266 /* mandatory */ 267 case RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE: 268 pr_debug("%s: RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE\n", __func__); 269 if (params->dev) { 270 *outbuf = cpu_to_le32(params->dev->mtu); 271 retval = 0; 272 } 273 break; 274 275 /* mandatory */ 276 case RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE: 277 pr_debug("%s: RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE\n", __func__); 278 if (params->dev) { 279 *outbuf = cpu_to_le32(params->dev->mtu); 280 retval = 0; 281 } 282 break; 283 284 /* mandatory */ 285 case RNDIS_OID_GEN_VENDOR_ID: 286 pr_debug("%s: RNDIS_OID_GEN_VENDOR_ID\n", __func__); 287 *outbuf = cpu_to_le32(params->vendorID); 288 retval = 0; 289 break; 290 291 /* mandatory */ 292 case RNDIS_OID_GEN_VENDOR_DESCRIPTION: 293 pr_debug("%s: RNDIS_OID_GEN_VENDOR_DESCRIPTION\n", __func__); 294 if (params->vendorDescr) { 295 length = strlen(params->vendorDescr); 296 memcpy(outbuf, params->vendorDescr, length); 297 } else { 298 outbuf[0] = 0; 299 } 300 retval = 0; 301 break; 302 303 case RNDIS_OID_GEN_VENDOR_DRIVER_VERSION: 304 pr_debug("%s: RNDIS_OID_GEN_VENDOR_DRIVER_VERSION\n", __func__); 305 /* Created as LE */ 306 *outbuf = rndis_driver_version; 307 retval = 0; 308 break; 309 310 /* mandatory */ 311 case RNDIS_OID_GEN_CURRENT_PACKET_FILTER: 312 pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER\n", __func__); 313 *outbuf = cpu_to_le32(*params->filter); 314 retval = 0; 315 break; 316 317 /* mandatory */ 318 case RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE: 319 pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE\n", __func__); 320 *outbuf = cpu_to_le32(RNDIS_MAX_TOTAL_SIZE); 321 retval = 0; 322 break; 323 324 /* mandatory */ 325 case RNDIS_OID_GEN_MEDIA_CONNECT_STATUS: 326 if (rndis_debug > 1) 327 pr_debug("%s: RNDIS_OID_GEN_MEDIA_CONNECT_STATUS\n", __func__); 328 *outbuf = cpu_to_le32(params->media_state); 329 retval = 0; 330 break; 331 332 case RNDIS_OID_GEN_PHYSICAL_MEDIUM: 333 pr_debug("%s: RNDIS_OID_GEN_PHYSICAL_MEDIUM\n", __func__); 334 *outbuf = cpu_to_le32(0); 335 retval = 0; 336 break; 337 338 /* The RNDIS specification is incomplete/wrong. Some versions 339 * of MS-Windows expect OIDs that aren't specified there. Other 340 * versions emit undefined RNDIS messages. DOCUMENT ALL THESE! 341 */ 342 case RNDIS_OID_GEN_MAC_OPTIONS: /* from WinME */ 343 pr_debug("%s: RNDIS_OID_GEN_MAC_OPTIONS\n", __func__); 344 *outbuf = cpu_to_le32( 345 RNDIS_MAC_OPTION_RECEIVE_SERIALIZED 346 | RNDIS_MAC_OPTION_FULL_DUPLEX); 347 retval = 0; 348 break; 349 350 /* statistics OIDs (table 4-2) */ 351 352 /* mandatory */ 353 case RNDIS_OID_GEN_XMIT_OK: 354 if (rndis_debug > 1) 355 pr_debug("%s: RNDIS_OID_GEN_XMIT_OK\n", __func__); 356 if (stats) { 357 *outbuf = cpu_to_le32(stats->tx_packets 358 - stats->tx_errors - stats->tx_dropped); 359 retval = 0; 360 } 361 break; 362 363 /* mandatory */ 364 case RNDIS_OID_GEN_RCV_OK: 365 if (rndis_debug > 1) 366 pr_debug("%s: RNDIS_OID_GEN_RCV_OK\n", __func__); 367 if (stats) { 368 *outbuf = cpu_to_le32(stats->rx_packets 369 - stats->rx_errors - stats->rx_dropped); 370 retval = 0; 371 } 372 break; 373 374 /* mandatory */ 375 case RNDIS_OID_GEN_XMIT_ERROR: 376 if (rndis_debug > 1) 377 pr_debug("%s: RNDIS_OID_GEN_XMIT_ERROR\n", __func__); 378 if (stats) { 379 *outbuf = cpu_to_le32(stats->tx_errors); 380 retval = 0; 381 } 382 break; 383 384 /* mandatory */ 385 case RNDIS_OID_GEN_RCV_ERROR: 386 if (rndis_debug > 1) 387 pr_debug("%s: RNDIS_OID_GEN_RCV_ERROR\n", __func__); 388 if (stats) { 389 *outbuf = cpu_to_le32(stats->rx_errors); 390 retval = 0; 391 } 392 break; 393 394 /* mandatory */ 395 case RNDIS_OID_GEN_RCV_NO_BUFFER: 396 pr_debug("%s: RNDIS_OID_GEN_RCV_NO_BUFFER\n", __func__); 397 if (stats) { 398 *outbuf = cpu_to_le32(stats->rx_dropped); 399 retval = 0; 400 } 401 break; 402 403 /* ieee802.3 OIDs (table 4-3) */ 404 405 /* mandatory */ 406 case RNDIS_OID_802_3_PERMANENT_ADDRESS: 407 pr_debug("%s: RNDIS_OID_802_3_PERMANENT_ADDRESS\n", __func__); 408 if (params->dev) { 409 length = ETH_ALEN; 410 memcpy(outbuf, params->host_mac, length); 411 retval = 0; 412 } 413 break; 414 415 /* mandatory */ 416 case RNDIS_OID_802_3_CURRENT_ADDRESS: 417 pr_debug("%s: RNDIS_OID_802_3_CURRENT_ADDRESS\n", __func__); 418 if (params->dev) { 419 length = ETH_ALEN; 420 memcpy(outbuf, params->host_mac, length); 421 retval = 0; 422 } 423 break; 424 425 /* mandatory */ 426 case RNDIS_OID_802_3_MULTICAST_LIST: 427 pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__); 428 /* Multicast base address only */ 429 *outbuf = cpu_to_le32(0xE0000000); 430 retval = 0; 431 break; 432 433 /* mandatory */ 434 case RNDIS_OID_802_3_MAXIMUM_LIST_SIZE: 435 pr_debug("%s: RNDIS_OID_802_3_MAXIMUM_LIST_SIZE\n", __func__); 436 /* Multicast base address only */ 437 *outbuf = cpu_to_le32(1); 438 retval = 0; 439 break; 440 441 case RNDIS_OID_802_3_MAC_OPTIONS: 442 pr_debug("%s: RNDIS_OID_802_3_MAC_OPTIONS\n", __func__); 443 *outbuf = cpu_to_le32(0); 444 retval = 0; 445 break; 446 447 /* ieee802.3 statistics OIDs (table 4-4) */ 448 449 /* mandatory */ 450 case RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT: 451 pr_debug("%s: RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT\n", __func__); 452 if (stats) { 453 *outbuf = cpu_to_le32(stats->rx_frame_errors); 454 retval = 0; 455 } 456 break; 457 458 /* mandatory */ 459 case RNDIS_OID_802_3_XMIT_ONE_COLLISION: 460 pr_debug("%s: RNDIS_OID_802_3_XMIT_ONE_COLLISION\n", __func__); 461 *outbuf = cpu_to_le32(0); 462 retval = 0; 463 break; 464 465 /* mandatory */ 466 case RNDIS_OID_802_3_XMIT_MORE_COLLISIONS: 467 pr_debug("%s: RNDIS_OID_802_3_XMIT_MORE_COLLISIONS\n", __func__); 468 *outbuf = cpu_to_le32(0); 469 retval = 0; 470 break; 471 472 default: 473 pr_warn("%s: query unknown OID 0x%08X\n", __func__, OID); 474 } 475 if (retval < 0) 476 length = 0; 477 478 resp->InformationBufferLength = cpu_to_le32(length); 479 r->length = length + sizeof(*resp); 480 resp->MessageLength = cpu_to_le32(r->length); 481 return retval; 482 } 483 484 static int gen_ndis_set_resp(struct rndis_params *params, u32 OID, 485 u8 *buf, u32 buf_len, rndis_resp_t *r) 486 { 487 rndis_set_cmplt_type *resp; 488 int i, retval = -ENOTSUPP; 489 490 if (!r) 491 return -ENOMEM; 492 resp = (rndis_set_cmplt_type *)r->buf; 493 if (!resp) 494 return -ENOMEM; 495 496 if (buf_len && rndis_debug > 1) { 497 pr_debug("set OID %08x value, len %d:\n", OID, buf_len); 498 for (i = 0; i < buf_len; i += 16) { 499 pr_debug("%03d: %08x %08x %08x %08x\n", i, 500 get_unaligned_le32(&buf[i]), 501 get_unaligned_le32(&buf[i + 4]), 502 get_unaligned_le32(&buf[i + 8]), 503 get_unaligned_le32(&buf[i + 12])); 504 } 505 } 506 507 switch (OID) { 508 case RNDIS_OID_GEN_CURRENT_PACKET_FILTER: 509 510 /* these NDIS_PACKET_TYPE_* bitflags are shared with 511 * cdc_filter; it's not RNDIS-specific 512 * NDIS_PACKET_TYPE_x == USB_CDC_PACKET_TYPE_x for x in: 513 * PROMISCUOUS, DIRECTED, 514 * MULTICAST, ALL_MULTICAST, BROADCAST 515 */ 516 *params->filter = (u16)get_unaligned_le32(buf); 517 pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER %08x\n", 518 __func__, *params->filter); 519 520 /* this call has a significant side effect: it's 521 * what makes the packet flow start and stop, like 522 * activating the CDC Ethernet altsetting. 523 */ 524 retval = 0; 525 if (*params->filter) { 526 params->state = RNDIS_DATA_INITIALIZED; 527 netif_carrier_on(params->dev); 528 if (netif_running(params->dev)) 529 netif_wake_queue(params->dev); 530 } else { 531 params->state = RNDIS_INITIALIZED; 532 netif_carrier_off(params->dev); 533 netif_stop_queue(params->dev); 534 } 535 break; 536 537 case RNDIS_OID_802_3_MULTICAST_LIST: 538 /* I think we can ignore this */ 539 pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__); 540 retval = 0; 541 break; 542 543 default: 544 pr_warn("%s: set unknown OID 0x%08X, size %d\n", 545 __func__, OID, buf_len); 546 } 547 548 return retval; 549 } 550 551 /* 552 * Response Functions 553 */ 554 555 static int rndis_init_response(struct rndis_params *params, 556 rndis_init_msg_type *buf) 557 { 558 rndis_init_cmplt_type *resp; 559 rndis_resp_t *r; 560 561 if (!params->dev) 562 return -ENOTSUPP; 563 564 r = rndis_add_response(params, sizeof(rndis_init_cmplt_type)); 565 if (!r) 566 return -ENOMEM; 567 resp = (rndis_init_cmplt_type *)r->buf; 568 569 resp->MessageType = cpu_to_le32(RNDIS_MSG_INIT_C); 570 resp->MessageLength = cpu_to_le32(52); 571 resp->RequestID = buf->RequestID; /* Still LE in msg buffer */ 572 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS); 573 resp->MajorVersion = cpu_to_le32(RNDIS_MAJOR_VERSION); 574 resp->MinorVersion = cpu_to_le32(RNDIS_MINOR_VERSION); 575 resp->DeviceFlags = cpu_to_le32(RNDIS_DF_CONNECTIONLESS); 576 resp->Medium = cpu_to_le32(RNDIS_MEDIUM_802_3); 577 resp->MaxPacketsPerTransfer = cpu_to_le32(1); 578 resp->MaxTransferSize = cpu_to_le32( 579 params->dev->mtu 580 + sizeof(struct ethhdr) 581 + sizeof(struct rndis_packet_msg_type) 582 + 22); 583 resp->PacketAlignmentFactor = cpu_to_le32(0); 584 resp->AFListOffset = cpu_to_le32(0); 585 resp->AFListSize = cpu_to_le32(0); 586 587 params->resp_avail(params->v); 588 return 0; 589 } 590 591 static int rndis_query_response(struct rndis_params *params, 592 rndis_query_msg_type *buf) 593 { 594 u32 BufLength, BufOffset; 595 rndis_query_cmplt_type *resp; 596 rndis_resp_t *r; 597 598 /* pr_debug("%s: OID = %08X\n", __func__, cpu_to_le32(buf->OID)); */ 599 if (!params->dev) 600 return -ENOTSUPP; 601 602 BufLength = le32_to_cpu(buf->InformationBufferLength); 603 BufOffset = le32_to_cpu(buf->InformationBufferOffset); 604 if ((BufLength > RNDIS_MAX_TOTAL_SIZE) || 605 (BufOffset > RNDIS_MAX_TOTAL_SIZE) || 606 (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE)) 607 return -EINVAL; 608 609 /* 610 * we need more memory: 611 * gen_ndis_query_resp expects enough space for 612 * rndis_query_cmplt_type followed by data. 613 * oid_supported_list is the largest data reply 614 */ 615 r = rndis_add_response(params, 616 sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type)); 617 if (!r) 618 return -ENOMEM; 619 resp = (rndis_query_cmplt_type *)r->buf; 620 621 resp->MessageType = cpu_to_le32(RNDIS_MSG_QUERY_C); 622 resp->RequestID = buf->RequestID; /* Still LE in msg buffer */ 623 624 if (gen_ndis_query_resp(params, le32_to_cpu(buf->OID), 625 BufOffset + 8 + (u8 *)buf, 626 BufLength, r)) { 627 /* OID not supported */ 628 resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED); 629 resp->MessageLength = cpu_to_le32(sizeof *resp); 630 resp->InformationBufferLength = cpu_to_le32(0); 631 resp->InformationBufferOffset = cpu_to_le32(0); 632 } else 633 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS); 634 635 params->resp_avail(params->v); 636 return 0; 637 } 638 639 static int rndis_set_response(struct rndis_params *params, 640 rndis_set_msg_type *buf) 641 { 642 u32 BufLength, BufOffset; 643 rndis_set_cmplt_type *resp; 644 rndis_resp_t *r; 645 646 BufLength = le32_to_cpu(buf->InformationBufferLength); 647 BufOffset = le32_to_cpu(buf->InformationBufferOffset); 648 if ((BufLength > RNDIS_MAX_TOTAL_SIZE) || 649 (BufOffset > RNDIS_MAX_TOTAL_SIZE) || 650 (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE)) 651 return -EINVAL; 652 653 r = rndis_add_response(params, sizeof(rndis_set_cmplt_type)); 654 if (!r) 655 return -ENOMEM; 656 resp = (rndis_set_cmplt_type *)r->buf; 657 658 #ifdef VERBOSE_DEBUG 659 pr_debug("%s: Length: %d\n", __func__, BufLength); 660 pr_debug("%s: Offset: %d\n", __func__, BufOffset); 661 pr_debug("%s: InfoBuffer: ", __func__); 662 663 for (i = 0; i < BufLength; i++) { 664 pr_debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset)); 665 } 666 667 pr_debug("\n"); 668 #endif 669 670 resp->MessageType = cpu_to_le32(RNDIS_MSG_SET_C); 671 resp->MessageLength = cpu_to_le32(16); 672 resp->RequestID = buf->RequestID; /* Still LE in msg buffer */ 673 if (gen_ndis_set_resp(params, le32_to_cpu(buf->OID), 674 ((u8 *)buf) + 8 + BufOffset, BufLength, r)) 675 resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED); 676 else 677 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS); 678 679 params->resp_avail(params->v); 680 return 0; 681 } 682 683 static int rndis_reset_response(struct rndis_params *params, 684 rndis_reset_msg_type *buf) 685 { 686 rndis_reset_cmplt_type *resp; 687 rndis_resp_t *r; 688 u8 *xbuf; 689 u32 length; 690 691 /* drain the response queue */ 692 while ((xbuf = rndis_get_next_response(params, &length))) 693 rndis_free_response(params, xbuf); 694 695 r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type)); 696 if (!r) 697 return -ENOMEM; 698 resp = (rndis_reset_cmplt_type *)r->buf; 699 700 resp->MessageType = cpu_to_le32(RNDIS_MSG_RESET_C); 701 resp->MessageLength = cpu_to_le32(16); 702 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS); 703 /* resent information */ 704 resp->AddressingReset = cpu_to_le32(1); 705 706 params->resp_avail(params->v); 707 return 0; 708 } 709 710 static int rndis_keepalive_response(struct rndis_params *params, 711 rndis_keepalive_msg_type *buf) 712 { 713 rndis_keepalive_cmplt_type *resp; 714 rndis_resp_t *r; 715 716 /* host "should" check only in RNDIS_DATA_INITIALIZED state */ 717 718 r = rndis_add_response(params, sizeof(rndis_keepalive_cmplt_type)); 719 if (!r) 720 return -ENOMEM; 721 resp = (rndis_keepalive_cmplt_type *)r->buf; 722 723 resp->MessageType = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C); 724 resp->MessageLength = cpu_to_le32(16); 725 resp->RequestID = buf->RequestID; /* Still LE in msg buffer */ 726 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS); 727 728 params->resp_avail(params->v); 729 return 0; 730 } 731 732 733 /* 734 * Device to Host Comunication 735 */ 736 static int rndis_indicate_status_msg(struct rndis_params *params, u32 status) 737 { 738 rndis_indicate_status_msg_type *resp; 739 rndis_resp_t *r; 740 741 if (params->state == RNDIS_UNINITIALIZED) 742 return -ENOTSUPP; 743 744 r = rndis_add_response(params, sizeof(rndis_indicate_status_msg_type)); 745 if (!r) 746 return -ENOMEM; 747 resp = (rndis_indicate_status_msg_type *)r->buf; 748 749 resp->MessageType = cpu_to_le32(RNDIS_MSG_INDICATE); 750 resp->MessageLength = cpu_to_le32(20); 751 resp->Status = cpu_to_le32(status); 752 resp->StatusBufferLength = cpu_to_le32(0); 753 resp->StatusBufferOffset = cpu_to_le32(0); 754 755 params->resp_avail(params->v); 756 return 0; 757 } 758 759 int rndis_signal_connect(struct rndis_params *params) 760 { 761 params->media_state = RNDIS_MEDIA_STATE_CONNECTED; 762 return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_CONNECT); 763 } 764 EXPORT_SYMBOL_GPL(rndis_signal_connect); 765 766 int rndis_signal_disconnect(struct rndis_params *params) 767 { 768 params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED; 769 return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_DISCONNECT); 770 } 771 EXPORT_SYMBOL_GPL(rndis_signal_disconnect); 772 773 void rndis_uninit(struct rndis_params *params) 774 { 775 u8 *buf; 776 u32 length; 777 778 if (!params) 779 return; 780 params->state = RNDIS_UNINITIALIZED; 781 782 /* drain the response queue */ 783 while ((buf = rndis_get_next_response(params, &length))) 784 rndis_free_response(params, buf); 785 } 786 EXPORT_SYMBOL_GPL(rndis_uninit); 787 788 void rndis_set_host_mac(struct rndis_params *params, const u8 *addr) 789 { 790 params->host_mac = addr; 791 } 792 EXPORT_SYMBOL_GPL(rndis_set_host_mac); 793 794 /* 795 * Message Parser 796 */ 797 int rndis_msg_parser(struct rndis_params *params, u8 *buf) 798 { 799 u32 MsgType, MsgLength; 800 __le32 *tmp; 801 802 if (!buf) 803 return -ENOMEM; 804 805 tmp = (__le32 *)buf; 806 MsgType = get_unaligned_le32(tmp++); 807 MsgLength = get_unaligned_le32(tmp++); 808 809 if (!params) 810 return -ENOTSUPP; 811 812 /* NOTE: RNDIS is *EXTREMELY* chatty ... Windows constantly polls for 813 * rx/tx statistics and link status, in addition to KEEPALIVE traffic 814 * and normal HC level polling to see if there's any IN traffic. 815 */ 816 817 /* For USB: responses may take up to 10 seconds */ 818 switch (MsgType) { 819 case RNDIS_MSG_INIT: 820 pr_debug("%s: RNDIS_MSG_INIT\n", 821 __func__); 822 params->state = RNDIS_INITIALIZED; 823 return rndis_init_response(params, (rndis_init_msg_type *)buf); 824 825 case RNDIS_MSG_HALT: 826 pr_debug("%s: RNDIS_MSG_HALT\n", 827 __func__); 828 params->state = RNDIS_UNINITIALIZED; 829 if (params->dev) { 830 netif_carrier_off(params->dev); 831 netif_stop_queue(params->dev); 832 } 833 return 0; 834 835 case RNDIS_MSG_QUERY: 836 return rndis_query_response(params, 837 (rndis_query_msg_type *)buf); 838 839 case RNDIS_MSG_SET: 840 return rndis_set_response(params, (rndis_set_msg_type *)buf); 841 842 case RNDIS_MSG_RESET: 843 pr_debug("%s: RNDIS_MSG_RESET\n", 844 __func__); 845 return rndis_reset_response(params, 846 (rndis_reset_msg_type *)buf); 847 848 case RNDIS_MSG_KEEPALIVE: 849 /* For USB: host does this every 5 seconds */ 850 if (rndis_debug > 1) 851 pr_debug("%s: RNDIS_MSG_KEEPALIVE\n", 852 __func__); 853 return rndis_keepalive_response(params, 854 (rndis_keepalive_msg_type *) 855 buf); 856 857 default: 858 /* At least Windows XP emits some undefined RNDIS messages. 859 * In one case those messages seemed to relate to the host 860 * suspending itself. 861 */ 862 pr_warn("%s: unknown RNDIS message 0x%08X len %d\n", 863 __func__, MsgType, MsgLength); 864 /* Garbled message can be huge, so limit what we display */ 865 if (MsgLength > 16) 866 MsgLength = 16; 867 print_hex_dump_bytes(__func__, DUMP_PREFIX_OFFSET, 868 buf, MsgLength); 869 break; 870 } 871 872 return -ENOTSUPP; 873 } 874 EXPORT_SYMBOL_GPL(rndis_msg_parser); 875 876 static inline int rndis_get_nr(void) 877 { 878 return ida_alloc_max(&rndis_ida, 999, GFP_KERNEL); 879 } 880 881 static inline void rndis_put_nr(int nr) 882 { 883 ida_free(&rndis_ida, nr); 884 } 885 886 struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v) 887 { 888 struct rndis_params *params; 889 int i; 890 891 if (!resp_avail) 892 return ERR_PTR(-EINVAL); 893 894 i = rndis_get_nr(); 895 if (i < 0) { 896 pr_debug("failed\n"); 897 898 return ERR_PTR(-ENODEV); 899 } 900 901 params = kzalloc_obj(*params); 902 if (!params) { 903 rndis_put_nr(i); 904 905 return ERR_PTR(-ENOMEM); 906 } 907 908 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 909 { 910 struct proc_dir_entry *proc_entry; 911 char name[20]; 912 913 sprintf(name, NAME_TEMPLATE, i); 914 proc_entry = proc_create_data(name, 0660, NULL, 915 &rndis_proc_ops, params); 916 if (!proc_entry) { 917 kfree(params); 918 rndis_put_nr(i); 919 920 return ERR_PTR(-EIO); 921 } 922 } 923 #endif 924 925 params->confignr = i; 926 params->used = 1; 927 params->state = RNDIS_UNINITIALIZED; 928 params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED; 929 params->resp_avail = resp_avail; 930 params->v = v; 931 INIT_LIST_HEAD(¶ms->resp_queue); 932 spin_lock_init(¶ms->resp_lock); 933 pr_debug("%s: configNr = %d\n", __func__, i); 934 935 return params; 936 } 937 EXPORT_SYMBOL_GPL(rndis_register); 938 939 void rndis_deregister(struct rndis_params *params) 940 { 941 int i; 942 943 pr_debug("%s:\n", __func__); 944 945 if (!params) 946 return; 947 948 i = params->confignr; 949 950 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 951 { 952 char name[20]; 953 954 sprintf(name, NAME_TEMPLATE, i); 955 remove_proc_entry(name, NULL); 956 } 957 #endif 958 959 kfree(params); 960 rndis_put_nr(i); 961 } 962 EXPORT_SYMBOL_GPL(rndis_deregister); 963 int rndis_set_param_dev(struct rndis_params *params, struct net_device *dev, 964 u16 *cdc_filter) 965 { 966 pr_debug("%s:\n", __func__); 967 if (!dev) 968 return -EINVAL; 969 if (!params) 970 return -1; 971 972 params->dev = dev; 973 params->filter = cdc_filter; 974 975 return 0; 976 } 977 EXPORT_SYMBOL_GPL(rndis_set_param_dev); 978 979 int rndis_set_param_vendor(struct rndis_params *params, u32 vendorID, 980 const char *vendorDescr) 981 { 982 pr_debug("%s:\n", __func__); 983 if (!vendorDescr) return -1; 984 if (!params) 985 return -1; 986 987 params->vendorID = vendorID; 988 params->vendorDescr = vendorDescr; 989 990 return 0; 991 } 992 EXPORT_SYMBOL_GPL(rndis_set_param_vendor); 993 994 int rndis_set_param_medium(struct rndis_params *params, u32 medium, u32 speed) 995 { 996 pr_debug("%s: %u %u\n", __func__, medium, speed); 997 if (!params) 998 return -1; 999 1000 params->medium = medium; 1001 params->speed = speed; 1002 1003 return 0; 1004 } 1005 EXPORT_SYMBOL_GPL(rndis_set_param_medium); 1006 1007 void rndis_add_hdr(struct sk_buff *skb) 1008 { 1009 struct rndis_packet_msg_type *header; 1010 1011 if (!skb) 1012 return; 1013 header = skb_push(skb, sizeof(*header)); 1014 memset(header, 0, sizeof *header); 1015 header->MessageType = cpu_to_le32(RNDIS_MSG_PACKET); 1016 header->MessageLength = cpu_to_le32(skb->len); 1017 header->DataOffset = cpu_to_le32(36); 1018 header->DataLength = cpu_to_le32(skb->len - sizeof(*header)); 1019 } 1020 EXPORT_SYMBOL_GPL(rndis_add_hdr); 1021 1022 void rndis_free_response(struct rndis_params *params, u8 *buf) 1023 { 1024 rndis_resp_t *r, *n; 1025 1026 spin_lock(¶ms->resp_lock); 1027 list_for_each_entry_safe(r, n, ¶ms->resp_queue, list) { 1028 if (r->buf == buf) { 1029 list_del(&r->list); 1030 kfree(r); 1031 } 1032 } 1033 spin_unlock(¶ms->resp_lock); 1034 } 1035 EXPORT_SYMBOL_GPL(rndis_free_response); 1036 1037 u8 *rndis_get_next_response(struct rndis_params *params, u32 *length) 1038 { 1039 rndis_resp_t *r, *n; 1040 1041 if (!length) return NULL; 1042 1043 spin_lock(¶ms->resp_lock); 1044 list_for_each_entry_safe(r, n, ¶ms->resp_queue, list) { 1045 if (!r->send) { 1046 r->send = 1; 1047 *length = r->length; 1048 spin_unlock(¶ms->resp_lock); 1049 return r->buf; 1050 } 1051 } 1052 1053 spin_unlock(¶ms->resp_lock); 1054 return NULL; 1055 } 1056 EXPORT_SYMBOL_GPL(rndis_get_next_response); 1057 1058 static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length) 1059 { 1060 rndis_resp_t *r; 1061 1062 /* NOTE: this gets copied into ether.c USB_BUFSIZ bytes ... */ 1063 r = kmalloc(sizeof(rndis_resp_t) + length, GFP_ATOMIC); 1064 if (!r) return NULL; 1065 1066 r->buf = (u8 *)(r + 1); 1067 r->length = length; 1068 r->send = 0; 1069 1070 spin_lock(¶ms->resp_lock); 1071 list_add_tail(&r->list, ¶ms->resp_queue); 1072 spin_unlock(¶ms->resp_lock); 1073 return r; 1074 } 1075 1076 int rndis_rm_hdr(struct gether *port, 1077 struct sk_buff *skb, 1078 struct sk_buff_head *list) 1079 { 1080 /* tmp points to a struct rndis_packet_msg_type */ 1081 __le32 *tmp = (void *)skb->data; 1082 1083 /* Need at least MessageType, MessageLength, DataOffset, DataLength */ 1084 if (skb->len < 16) { 1085 dev_kfree_skb_any(skb); 1086 return -EINVAL; 1087 } 1088 1089 /* MessageType, MessageLength */ 1090 if (cpu_to_le32(RNDIS_MSG_PACKET) 1091 != get_unaligned(tmp++)) { 1092 dev_kfree_skb_any(skb); 1093 return -EINVAL; 1094 } 1095 tmp++; 1096 1097 /* DataOffset, DataLength */ 1098 if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) { 1099 dev_kfree_skb_any(skb); 1100 return -EOVERFLOW; 1101 } 1102 skb_trim(skb, get_unaligned_le32(tmp++)); 1103 1104 skb_queue_tail(list, skb); 1105 return 0; 1106 } 1107 EXPORT_SYMBOL_GPL(rndis_rm_hdr); 1108 1109 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1110 1111 static int rndis_proc_show(struct seq_file *m, void *v) 1112 { 1113 rndis_params *param = m->private; 1114 1115 seq_printf(m, 1116 "Config Nr. %d\n" 1117 "used : %s\n" 1118 "state : %s\n" 1119 "medium : 0x%08X\n" 1120 "speed : %u\n" 1121 "cable : %s\n" 1122 "vendor ID : 0x%08X\n" 1123 "vendor : %s\n", 1124 param->confignr, (param->used) ? "y" : "n", 1125 ({ char *s = "?"; 1126 switch (param->state) { 1127 case RNDIS_UNINITIALIZED: 1128 s = "RNDIS_UNINITIALIZED"; break; 1129 case RNDIS_INITIALIZED: 1130 s = "RNDIS_INITIALIZED"; break; 1131 case RNDIS_DATA_INITIALIZED: 1132 s = "RNDIS_DATA_INITIALIZED"; break; 1133 } s; }), 1134 param->medium, 1135 (param->media_state) ? 0 : param->speed*100, 1136 (param->media_state) ? "disconnected" : "connected", 1137 param->vendorID, param->vendorDescr); 1138 return 0; 1139 } 1140 1141 static ssize_t rndis_proc_write(struct file *file, const char __user *buffer, 1142 size_t count, loff_t *ppos) 1143 { 1144 rndis_params *p = pde_data(file_inode(file)); 1145 u32 speed = 0; 1146 int i, fl_speed = 0; 1147 1148 for (i = 0; i < count; i++) { 1149 char c; 1150 if (get_user(c, buffer)) 1151 return -EFAULT; 1152 switch (c) { 1153 case '0': 1154 case '1': 1155 case '2': 1156 case '3': 1157 case '4': 1158 case '5': 1159 case '6': 1160 case '7': 1161 case '8': 1162 case '9': 1163 fl_speed = 1; 1164 speed = speed * 10 + c - '0'; 1165 break; 1166 case 'C': 1167 case 'c': 1168 rndis_signal_connect(p); 1169 break; 1170 case 'D': 1171 case 'd': 1172 rndis_signal_disconnect(p); 1173 break; 1174 default: 1175 if (fl_speed) p->speed = speed; 1176 else pr_debug("%c is not valid\n", c); 1177 break; 1178 } 1179 1180 buffer++; 1181 } 1182 1183 return count; 1184 } 1185 1186 static int rndis_proc_open(struct inode *inode, struct file *file) 1187 { 1188 return single_open(file, rndis_proc_show, pde_data(inode)); 1189 } 1190 1191 static const struct proc_ops rndis_proc_ops = { 1192 .proc_open = rndis_proc_open, 1193 .proc_read = seq_read, 1194 .proc_lseek = seq_lseek, 1195 .proc_release = single_release, 1196 .proc_write = rndis_proc_write, 1197 }; 1198 1199 #define NAME_TEMPLATE "driver/rndis-%03d" 1200 1201 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */ 1202