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