drivers/usb/gadget/function/rndis.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
gen_ndis_query_resp
gen_ndis_set_resp
rndis_init_response
rndis_query_response
rndis_set_response
rndis_reset_response
rndis_keepalive_response
rndis_indicate_status_msg
rndis_signal_connect
rndis_signal_disconnect
rndis_uninit
rndis_set_host_mac
rndis_msg_parser
rndis_get_nr
rndis_put_nr
rndis_register
rndis_deregister
rndis_set_param_dev
rndis_set_param_vendor
rndis_set_param_medium
rndis_add_hdr
rndis_free_response
rndis_get_next_response
rndis_add_response
rndis_rm_hdr
rndis_proc_show
rndis_proc_write
rndis_proc_open
   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 <asm/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 file_operations rndis_proc_fops;
  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         rndis_query_cmplt_type *resp;
 595         rndis_resp_t *r;
 596 
 597         /* pr_debug("%s: OID = %08X\n", __func__, cpu_to_le32(buf->OID)); */
 598         if (!params->dev)
 599                 return -ENOTSUPP;
 600 
 601         /*
 602          * we need more memory:
 603          * gen_ndis_query_resp expects enough space for
 604          * rndis_query_cmplt_type followed by data.
 605          * oid_supported_list is the largest data reply
 606          */
 607         r = rndis_add_response(params,
 608                 sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type));
 609         if (!r)
 610                 return -ENOMEM;
 611         resp = (rndis_query_cmplt_type *)r->buf;
 612 
 613         resp->MessageType = cpu_to_le32(RNDIS_MSG_QUERY_C);
 614         resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
 615 
 616         if (gen_ndis_query_resp(params, le32_to_cpu(buf->OID),
 617                         le32_to_cpu(buf->InformationBufferOffset)
 618                                         + 8 + (u8 *)buf,
 619                         le32_to_cpu(buf->InformationBufferLength),
 620                         r)) {
 621                 /* OID not supported */
 622                 resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
 623                 resp->MessageLength = cpu_to_le32(sizeof *resp);
 624                 resp->InformationBufferLength = cpu_to_le32(0);
 625                 resp->InformationBufferOffset = cpu_to_le32(0);
 626         } else
 627                 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
 628 
 629         params->resp_avail(params->v);
 630         return 0;
 631 }
 632 
 633 static int rndis_set_response(struct rndis_params *params,
 634                               rndis_set_msg_type *buf)
 635 {
 636         u32 BufLength, BufOffset;
 637         rndis_set_cmplt_type *resp;
 638         rndis_resp_t *r;
 639 
 640         r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
 641         if (!r)
 642                 return -ENOMEM;
 643         resp = (rndis_set_cmplt_type *)r->buf;
 644 
 645         BufLength = le32_to_cpu(buf->InformationBufferLength);
 646         BufOffset = le32_to_cpu(buf->InformationBufferOffset);
 647 
 648 #ifdef  VERBOSE_DEBUG
 649         pr_debug("%s: Length: %d\n", __func__, BufLength);
 650         pr_debug("%s: Offset: %d\n", __func__, BufOffset);
 651         pr_debug("%s: InfoBuffer: ", __func__);
 652 
 653         for (i = 0; i < BufLength; i++) {
 654                 pr_debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset));
 655         }
 656 
 657         pr_debug("\n");
 658 #endif
 659 
 660         resp->MessageType = cpu_to_le32(RNDIS_MSG_SET_C);
 661         resp->MessageLength = cpu_to_le32(16);
 662         resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
 663         if (gen_ndis_set_resp(params, le32_to_cpu(buf->OID),
 664                         ((u8 *)buf) + 8 + BufOffset, BufLength, r))
 665                 resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
 666         else
 667                 resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
 668 
 669         params->resp_avail(params->v);
 670         return 0;
 671 }
 672 
 673 static int rndis_reset_response(struct rndis_params *params,
 674                                 rndis_reset_msg_type *buf)
 675 {
 676         rndis_reset_cmplt_type *resp;
 677         rndis_resp_t *r;
 678         u8 *xbuf;
 679         u32 length;
 680 
 681         /* drain the response queue */
 682         while ((xbuf = rndis_get_next_response(params, &length)))
 683                 rndis_free_response(params, xbuf);
 684 
 685         r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
 686         if (!r)
 687                 return -ENOMEM;
 688         resp = (rndis_reset_cmplt_type *)r->buf;
 689 
 690         resp->MessageType = cpu_to_le32(RNDIS_MSG_RESET_C);
 691         resp->MessageLength = cpu_to_le32(16);
 692         resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
 693         /* resent information */
 694         resp->AddressingReset = cpu_to_le32(1);
 695 
 696         params->resp_avail(params->v);
 697         return 0;
 698 }
 699 
 700 static int rndis_keepalive_response(struct rndis_params *params,
 701                                     rndis_keepalive_msg_type *buf)
 702 {
 703         rndis_keepalive_cmplt_type *resp;
 704         rndis_resp_t *r;
 705 
 706         /* host "should" check only in RNDIS_DATA_INITIALIZED state */
 707 
 708         r = rndis_add_response(params, sizeof(rndis_keepalive_cmplt_type));
 709         if (!r)
 710                 return -ENOMEM;
 711         resp = (rndis_keepalive_cmplt_type *)r->buf;
 712 
 713         resp->MessageType = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
 714         resp->MessageLength = cpu_to_le32(16);
 715         resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
 716         resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
 717 
 718         params->resp_avail(params->v);
 719         return 0;
 720 }
 721 
 722 
 723 /*
 724  * Device to Host Comunication
 725  */
 726 static int rndis_indicate_status_msg(struct rndis_params *params, u32 status)
 727 {
 728         rndis_indicate_status_msg_type *resp;
 729         rndis_resp_t *r;
 730 
 731         if (params->state == RNDIS_UNINITIALIZED)
 732                 return -ENOTSUPP;
 733 
 734         r = rndis_add_response(params, sizeof(rndis_indicate_status_msg_type));
 735         if (!r)
 736                 return -ENOMEM;
 737         resp = (rndis_indicate_status_msg_type *)r->buf;
 738 
 739         resp->MessageType = cpu_to_le32(RNDIS_MSG_INDICATE);
 740         resp->MessageLength = cpu_to_le32(20);
 741         resp->Status = cpu_to_le32(status);
 742         resp->StatusBufferLength = cpu_to_le32(0);
 743         resp->StatusBufferOffset = cpu_to_le32(0);
 744 
 745         params->resp_avail(params->v);
 746         return 0;
 747 }
 748 
 749 int rndis_signal_connect(struct rndis_params *params)
 750 {
 751         params->media_state = RNDIS_MEDIA_STATE_CONNECTED;
 752         return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_CONNECT);
 753 }
 754 EXPORT_SYMBOL_GPL(rndis_signal_connect);
 755 
 756 int rndis_signal_disconnect(struct rndis_params *params)
 757 {
 758         params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
 759         return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_DISCONNECT);
 760 }
 761 EXPORT_SYMBOL_GPL(rndis_signal_disconnect);
 762 
 763 void rndis_uninit(struct rndis_params *params)
 764 {
 765         u8 *buf;
 766         u32 length;
 767 
 768         if (!params)
 769                 return;
 770         params->state = RNDIS_UNINITIALIZED;
 771 
 772         /* drain the response queue */
 773         while ((buf = rndis_get_next_response(params, &length)))
 774                 rndis_free_response(params, buf);
 775 }
 776 EXPORT_SYMBOL_GPL(rndis_uninit);
 777 
 778 void rndis_set_host_mac(struct rndis_params *params, const u8 *addr)
 779 {
 780         params->host_mac = addr;
 781 }
 782 EXPORT_SYMBOL_GPL(rndis_set_host_mac);
 783 
 784 /*
 785  * Message Parser
 786  */
 787 int rndis_msg_parser(struct rndis_params *params, u8 *buf)
 788 {
 789         u32 MsgType, MsgLength;
 790         __le32 *tmp;
 791 
 792         if (!buf)
 793                 return -ENOMEM;
 794 
 795         tmp = (__le32 *)buf;
 796         MsgType   = get_unaligned_le32(tmp++);
 797         MsgLength = get_unaligned_le32(tmp++);
 798 
 799         if (!params)
 800                 return -ENOTSUPP;
 801 
 802         /* NOTE: RNDIS is *EXTREMELY* chatty ... Windows constantly polls for
 803          * rx/tx statistics and link status, in addition to KEEPALIVE traffic
 804          * and normal HC level polling to see if there's any IN traffic.
 805          */
 806 
 807         /* For USB: responses may take up to 10 seconds */
 808         switch (MsgType) {
 809         case RNDIS_MSG_INIT:
 810                 pr_debug("%s: RNDIS_MSG_INIT\n",
 811                         __func__);
 812                 params->state = RNDIS_INITIALIZED;
 813                 return rndis_init_response(params, (rndis_init_msg_type *)buf);
 814 
 815         case RNDIS_MSG_HALT:
 816                 pr_debug("%s: RNDIS_MSG_HALT\n",
 817                         __func__);
 818                 params->state = RNDIS_UNINITIALIZED;
 819                 if (params->dev) {
 820                         netif_carrier_off(params->dev);
 821                         netif_stop_queue(params->dev);
 822                 }
 823                 return 0;
 824 
 825         case RNDIS_MSG_QUERY:
 826                 return rndis_query_response(params,
 827                                         (rndis_query_msg_type *)buf);
 828 
 829         case RNDIS_MSG_SET:
 830                 return rndis_set_response(params, (rndis_set_msg_type *)buf);
 831 
 832         case RNDIS_MSG_RESET:
 833                 pr_debug("%s: RNDIS_MSG_RESET\n",
 834                         __func__);
 835                 return rndis_reset_response(params,
 836                                         (rndis_reset_msg_type *)buf);
 837 
 838         case RNDIS_MSG_KEEPALIVE:
 839                 /* For USB: host does this every 5 seconds */
 840                 if (rndis_debug > 1)
 841                         pr_debug("%s: RNDIS_MSG_KEEPALIVE\n",
 842                                 __func__);
 843                 return rndis_keepalive_response(params,
 844                                                  (rndis_keepalive_msg_type *)
 845                                                  buf);
 846 
 847         default:
 848                 /* At least Windows XP emits some undefined RNDIS messages.
 849                  * In one case those messages seemed to relate to the host
 850                  * suspending itself.
 851                  */
 852                 pr_warn("%s: unknown RNDIS message 0x%08X len %d\n",
 853                         __func__, MsgType, MsgLength);
 854                 /* Garbled message can be huge, so limit what we display */
 855                 if (MsgLength > 16)
 856                         MsgLength = 16;
 857                 print_hex_dump_bytes(__func__, DUMP_PREFIX_OFFSET,
 858                                      buf, MsgLength);
 859                 break;
 860         }
 861 
 862         return -ENOTSUPP;
 863 }
 864 EXPORT_SYMBOL_GPL(rndis_msg_parser);
 865 
 866 static inline int rndis_get_nr(void)
 867 {
 868         return ida_simple_get(&rndis_ida, 0, 0, GFP_KERNEL);
 869 }
 870 
 871 static inline void rndis_put_nr(int nr)
 872 {
 873         ida_simple_remove(&rndis_ida, nr);
 874 }
 875 
 876 struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v)
 877 {
 878         struct rndis_params *params;
 879         int i;
 880 
 881         if (!resp_avail)
 882                 return ERR_PTR(-EINVAL);
 883 
 884         i = rndis_get_nr();
 885         if (i < 0) {
 886                 pr_debug("failed\n");
 887 
 888                 return ERR_PTR(-ENODEV);
 889         }
 890 
 891         params = kzalloc(sizeof(*params), GFP_KERNEL);
 892         if (!params) {
 893                 rndis_put_nr(i);
 894 
 895                 return ERR_PTR(-ENOMEM);
 896         }
 897 
 898 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
 899         {
 900                 struct proc_dir_entry *proc_entry;
 901                 char name[20];
 902 
 903                 sprintf(name, NAME_TEMPLATE, i);
 904                 proc_entry = proc_create_data(name, 0660, NULL,
 905                                               &rndis_proc_fops, params);
 906                 if (!proc_entry) {
 907                         kfree(params);
 908                         rndis_put_nr(i);
 909 
 910                         return ERR_PTR(-EIO);
 911                 }
 912         }
 913 #endif
 914 
 915         params->confignr = i;
 916         params->used = 1;
 917         params->state = RNDIS_UNINITIALIZED;
 918         params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
 919         params->resp_avail = resp_avail;
 920         params->v = v;
 921         INIT_LIST_HEAD(&params->resp_queue);
 922         pr_debug("%s: configNr = %d\n", __func__, i);
 923 
 924         return params;
 925 }
 926 EXPORT_SYMBOL_GPL(rndis_register);
 927 
 928 void rndis_deregister(struct rndis_params *params)
 929 {
 930         int i;
 931 
 932         pr_debug("%s:\n", __func__);
 933 
 934         if (!params)
 935                 return;
 936 
 937         i = params->confignr;
 938 
 939 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
 940         {
 941                 char name[20];
 942 
 943                 sprintf(name, NAME_TEMPLATE, i);
 944                 remove_proc_entry(name, NULL);
 945         }
 946 #endif
 947 
 948         kfree(params);
 949         rndis_put_nr(i);
 950 }
 951 EXPORT_SYMBOL_GPL(rndis_deregister);
 952 int rndis_set_param_dev(struct rndis_params *params, struct net_device *dev,
 953                         u16 *cdc_filter)
 954 {
 955         pr_debug("%s:\n", __func__);
 956         if (!dev)
 957                 return -EINVAL;
 958         if (!params)
 959                 return -1;
 960 
 961         params->dev = dev;
 962         params->filter = cdc_filter;
 963 
 964         return 0;
 965 }
 966 EXPORT_SYMBOL_GPL(rndis_set_param_dev);
 967 
 968 int rndis_set_param_vendor(struct rndis_params *params, u32 vendorID,
 969                            const char *vendorDescr)
 970 {
 971         pr_debug("%s:\n", __func__);
 972         if (!vendorDescr) return -1;
 973         if (!params)
 974                 return -1;
 975 
 976         params->vendorID = vendorID;
 977         params->vendorDescr = vendorDescr;
 978 
 979         return 0;
 980 }
 981 EXPORT_SYMBOL_GPL(rndis_set_param_vendor);
 982 
 983 int rndis_set_param_medium(struct rndis_params *params, u32 medium, u32 speed)
 984 {
 985         pr_debug("%s: %u %u\n", __func__, medium, speed);
 986         if (!params)
 987                 return -1;
 988 
 989         params->medium = medium;
 990         params->speed = speed;
 991 
 992         return 0;
 993 }
 994 EXPORT_SYMBOL_GPL(rndis_set_param_medium);
 995 
 996 void rndis_add_hdr(struct sk_buff *skb)
 997 {
 998         struct rndis_packet_msg_type *header;
 999 
1000         if (!skb)
1001                 return;
1002         header = skb_push(skb, sizeof(*header));
1003         memset(header, 0, sizeof *header);
1004         header->MessageType = cpu_to_le32(RNDIS_MSG_PACKET);
1005         header->MessageLength = cpu_to_le32(skb->len);
1006         header->DataOffset = cpu_to_le32(36);
1007         header->DataLength = cpu_to_le32(skb->len - sizeof(*header));
1008 }
1009 EXPORT_SYMBOL_GPL(rndis_add_hdr);
1010 
1011 void rndis_free_response(struct rndis_params *params, u8 *buf)
1012 {
1013         rndis_resp_t *r, *n;
1014 
1015         list_for_each_entry_safe(r, n, &params->resp_queue, list) {
1016                 if (r->buf == buf) {
1017                         list_del(&r->list);
1018                         kfree(r);
1019                 }
1020         }
1021 }
1022 EXPORT_SYMBOL_GPL(rndis_free_response);
1023 
1024 u8 *rndis_get_next_response(struct rndis_params *params, u32 *length)
1025 {
1026         rndis_resp_t *r, *n;
1027 
1028         if (!length) return NULL;
1029 
1030         list_for_each_entry_safe(r, n, &params->resp_queue, list) {
1031                 if (!r->send) {
1032                         r->send = 1;
1033                         *length = r->length;
1034                         return r->buf;
1035                 }
1036         }
1037 
1038         return NULL;
1039 }
1040 EXPORT_SYMBOL_GPL(rndis_get_next_response);
1041 
1042 static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length)
1043 {
1044         rndis_resp_t *r;
1045 
1046         /* NOTE: this gets copied into ether.c USB_BUFSIZ bytes ... */
1047         r = kmalloc(sizeof(rndis_resp_t) + length, GFP_ATOMIC);
1048         if (!r) return NULL;
1049 
1050         r->buf = (u8 *)(r + 1);
1051         r->length = length;
1052         r->send = 0;
1053 
1054         list_add_tail(&r->list, &params->resp_queue);
1055         return r;
1056 }
1057 
1058 int rndis_rm_hdr(struct gether *port,
1059                         struct sk_buff *skb,
1060                         struct sk_buff_head *list)
1061 {
1062         /* tmp points to a struct rndis_packet_msg_type */
1063         __le32 *tmp = (void *)skb->data;
1064 
1065         /* MessageType, MessageLength */
1066         if (cpu_to_le32(RNDIS_MSG_PACKET)
1067                         != get_unaligned(tmp++)) {
1068                 dev_kfree_skb_any(skb);
1069                 return -EINVAL;
1070         }
1071         tmp++;
1072 
1073         /* DataOffset, DataLength */
1074         if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
1075                 dev_kfree_skb_any(skb);
1076                 return -EOVERFLOW;
1077         }
1078         skb_trim(skb, get_unaligned_le32(tmp++));
1079 
1080         skb_queue_tail(list, skb);
1081         return 0;
1082 }
1083 EXPORT_SYMBOL_GPL(rndis_rm_hdr);
1084 
1085 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1086 
1087 static int rndis_proc_show(struct seq_file *m, void *v)
1088 {
1089         rndis_params *param = m->private;
1090 
1091         seq_printf(m,
1092                          "Config Nr. %d\n"
1093                          "used      : %s\n"
1094                          "state     : %s\n"
1095                          "medium    : 0x%08X\n"
1096                          "speed     : %d\n"
1097                          "cable     : %s\n"
1098                          "vendor ID : 0x%08X\n"
1099                          "vendor    : %s\n",
1100                          param->confignr, (param->used) ? "y" : "n",
1101                          ({ char *s = "?";
1102                          switch (param->state) {
1103                          case RNDIS_UNINITIALIZED:
1104                                 s = "RNDIS_UNINITIALIZED"; break;
1105                          case RNDIS_INITIALIZED:
1106                                 s = "RNDIS_INITIALIZED"; break;
1107                          case RNDIS_DATA_INITIALIZED:
1108                                 s = "RNDIS_DATA_INITIALIZED"; break;
1109                         } s; }),
1110                          param->medium,
1111                          (param->media_state) ? 0 : param->speed*100,
1112                          (param->media_state) ? "disconnected" : "connected",
1113                          param->vendorID, param->vendorDescr);
1114         return 0;
1115 }
1116 
1117 static ssize_t rndis_proc_write(struct file *file, const char __user *buffer,
1118                                 size_t count, loff_t *ppos)
1119 {
1120         rndis_params *p = PDE_DATA(file_inode(file));
1121         u32 speed = 0;
1122         int i, fl_speed = 0;
1123 
1124         for (i = 0; i < count; i++) {
1125                 char c;
1126                 if (get_user(c, buffer))
1127                         return -EFAULT;
1128                 switch (c) {
1129                 case '0':
1130                 case '1':
1131                 case '2':
1132                 case '3':
1133                 case '4':
1134                 case '5':
1135                 case '6':
1136                 case '7':
1137                 case '8':
1138                 case '9':
1139                         fl_speed = 1;
1140                         speed = speed * 10 + c - '0';
1141                         break;
1142                 case 'C':
1143                 case 'c':
1144                         rndis_signal_connect(p);
1145                         break;
1146                 case 'D':
1147                 case 'd':
1148                         rndis_signal_disconnect(p);
1149                         break;
1150                 default:
1151                         if (fl_speed) p->speed = speed;
1152                         else pr_debug("%c is not valid\n", c);
1153                         break;
1154                 }
1155 
1156                 buffer++;
1157         }
1158 
1159         return count;
1160 }
1161 
1162 static int rndis_proc_open(struct inode *inode, struct file *file)
1163 {
1164         return single_open(file, rndis_proc_show, PDE_DATA(inode));
1165 }
1166 
1167 static const struct file_operations rndis_proc_fops = {
1168         .owner          = THIS_MODULE,
1169         .open           = rndis_proc_open,
1170         .read           = seq_read,
1171         .llseek         = seq_lseek,
1172         .release        = single_release,
1173         .write          = rndis_proc_write,
1174 };
1175 
1176 #define NAME_TEMPLATE "driver/rndis-%03d"
1177 
1178 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
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root/drivers/usb/gadget/function/rndis.c

DEFINITIONS
