drivers/net/hyperv/rndis_filter.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/wait.h>
  24 #include <linux/highmem.h>
  25 #include <linux/slab.h>
  26 #include <linux/io.h>
  27 #include <linux/if_ether.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/if_vlan.h>
  30 #include <linux/nls.h>
  31
  32 #include "hyperv_net.h"
  33
  34
  35 #define RNDIS_EXT_LEN 100
  36 struct rndis_request {
  37         struct list_head list_ent;
  38         struct completion  wait_event;
  39
  40         struct rndis_message response_msg;
  41         /*
  42          * The buffer for extended info after the RNDIS response message. It's
  43          * referenced based on the data offset in the RNDIS message. Its size
  44          * is enough for current needs, and should be sufficient for the near
  45          * future.
  46          */
  47         u8 response_ext[RNDIS_EXT_LEN];
  48
  49         /* Simplify allocation by having a netvsc packet inline */
  50         struct hv_netvsc_packet pkt;
  51         /* Set 2 pages for rndis requests crossing page boundary */
  52         struct hv_page_buffer buf[2];
  53
  54         struct rndis_message request_msg;
  55         /*
  56          * The buffer for the extended info after the RNDIS request message.
  57          * It is referenced and sized in a similar way as response_ext.
  58          */
  59         u8 request_ext[RNDIS_EXT_LEN];
  60 };
  61
  62 static void rndis_filter_send_completion(void *ctx);
  63
  64
  65 static struct rndis_device *get_rndis_device(void)
  66 {
  67         struct rndis_device *device;
  68
  69         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  70         if (!device)
  71                 return NULL;
  72
  73         spin_lock_init(&device->request_lock);
  74
  75         INIT_LIST_HEAD(&device->req_list);
  76
  77         device->state = RNDIS_DEV_UNINITIALIZED;
  78
  79         return device;
  80 }
  81
  82 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  83                                              u32 msg_type,
  84                                              u32 msg_len)
  85 {
  86         struct rndis_request *request;
  87         struct rndis_message *rndis_msg;
  88         struct rndis_set_request *set;
  89         unsigned long flags;
  90
  91         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  92         if (!request)
  93                 return NULL;
  94
  95         init_completion(&request->wait_event);
  96
  97         rndis_msg = &request->request_msg;
  98         rndis_msg->ndis_msg_type = msg_type;
  99         rndis_msg->msg_len = msg_len;
 100
 101         /*
 102          * Set the request id. This field is always after the rndis header for
 103          * request/response packet types so we just used the SetRequest as a
 104          * template
 105          */
 106         set = &rndis_msg->msg.set_req;
 107         set->req_id = atomic_inc_return(&dev->new_req_id);
 108
 109         /* Add to the request list */
 110         spin_lock_irqsave(&dev->request_lock, flags);
 111         list_add_tail(&request->list_ent, &dev->req_list);
 112         spin_unlock_irqrestore(&dev->request_lock, flags);
 113
 114         return request;
 115 }
 116
 117 static void put_rndis_request(struct rndis_device *dev,
 118                             struct rndis_request *req)
 119 {
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&dev->request_lock, flags);
 123         list_del(&req->list_ent);
 124         spin_unlock_irqrestore(&dev->request_lock, flags);
 125
 126         kfree(req);
 127 }
 128
 129 static void dump_rndis_message(struct hv_device *hv_dev,
 130                         struct rndis_message *rndis_msg)
 131 {
 132         struct net_device *netdev;
 133         struct netvsc_device *net_device;
 134
 135         net_device = hv_get_drvdata(hv_dev);
 136         netdev = net_device->ndev;
 137
 138         switch (rndis_msg->ndis_msg_type) {
 139         case RNDIS_MSG_PACKET:
 140                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 141                            "data offset %u data len %u, # oob %u, "
 142                            "oob offset %u, oob len %u, pkt offset %u, "
 143                            "pkt len %u\n",
 144                            rndis_msg->msg_len,
 145                            rndis_msg->msg.pkt.data_offset,
 146                            rndis_msg->msg.pkt.data_len,
 147                            rndis_msg->msg.pkt.num_oob_data_elements,
 148                            rndis_msg->msg.pkt.oob_data_offset,
 149                            rndis_msg->msg.pkt.oob_data_len,
 150                            rndis_msg->msg.pkt.per_pkt_info_offset,
 151                            rndis_msg->msg.pkt.per_pkt_info_len);
 152                 break;
 153
 154         case RNDIS_MSG_INIT_C:
 155                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 156                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 157                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 158                         "pkt aligned %u)\n",
 159                         rndis_msg->msg_len,
 160                         rndis_msg->msg.init_complete.req_id,
 161                         rndis_msg->msg.init_complete.status,
 162                         rndis_msg->msg.init_complete.major_ver,
 163                         rndis_msg->msg.init_complete.minor_ver,
 164                         rndis_msg->msg.init_complete.dev_flags,
 165                         rndis_msg->msg.init_complete.max_xfer_size,
 166                         rndis_msg->msg.init_complete.
 167                            max_pkt_per_msg,
 168                         rndis_msg->msg.init_complete.
 169                            pkt_alignment_factor);
 170                 break;
 171
 172         case RNDIS_MSG_QUERY_C:
 173                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 174                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 175                         "buf offset %u)\n",
 176                         rndis_msg->msg_len,
 177                         rndis_msg->msg.query_complete.req_id,
 178                         rndis_msg->msg.query_complete.status,
 179                         rndis_msg->msg.query_complete.
 180                            info_buflen,
 181                         rndis_msg->msg.query_complete.
 182                            info_buf_offset);
 183                 break;
 184
 185         case RNDIS_MSG_SET_C:
 186                 netdev_dbg(netdev,
 187                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 188                         rndis_msg->msg_len,
 189                         rndis_msg->msg.set_complete.req_id,
 190                         rndis_msg->msg.set_complete.status);
 191                 break;
 192
 193         case RNDIS_MSG_INDICATE:
 194                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 195                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 196                         rndis_msg->msg_len,
 197                         rndis_msg->msg.indicate_status.status,
 198                         rndis_msg->msg.indicate_status.status_buflen,
 199                         rndis_msg->msg.indicate_status.status_buf_offset);
 200                 break;
 201
 202         default:
 203                 netdev_dbg(netdev, "0x%x (len %u)\n",
 204                         rndis_msg->ndis_msg_type,
 205                         rndis_msg->msg_len);
 206                 break;
 207         }
 208 }
 209
 210 static int rndis_filter_send_request(struct rndis_device *dev,
 211                                   struct rndis_request *req)
 212 {
 213         int ret;
 214         struct hv_netvsc_packet *packet;
 215
 216         /* Setup the packet to send it */
 217         packet = &req->pkt;
 218
 219         packet->is_data_pkt = false;
 220         packet->total_data_buflen = req->request_msg.msg_len;
 221         packet->page_buf_cnt = 1;
 222
 223         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 224                                         PAGE_SHIFT;
 225         packet->page_buf[0].len = req->request_msg.msg_len;
 226         packet->page_buf[0].offset =
 227                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 228
 229         /* Add one page_buf when request_msg crossing page boundary */
 230         if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
 231                 packet->page_buf_cnt++;
 232                 packet->page_buf[0].len = PAGE_SIZE -
 233                         packet->page_buf[0].offset;
 234                 packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
 235                         + packet->page_buf[0].len) >> PAGE_SHIFT;
 236                 packet->page_buf[1].offset = 0;
 237                 packet->page_buf[1].len = req->request_msg.msg_len -
 238                         packet->page_buf[0].len;
 239         }
 240
 241         packet->completion.send.send_completion = NULL;
 242
 243         ret = netvsc_send(dev->net_dev->dev, packet);
 244         return ret;
 245 }
 246
 247 static void rndis_filter_receive_response(struct rndis_device *dev,
 248                                        struct rndis_message *resp)
 249 {
 250         struct rndis_request *request = NULL;
 251         bool found = false;
 252         unsigned long flags;
 253         struct net_device *ndev;
 254
 255         ndev = dev->net_dev->ndev;
 256
 257         spin_lock_irqsave(&dev->request_lock, flags);
 258         list_for_each_entry(request, &dev->req_list, list_ent) {
 259                 /*
 260                  * All request/response message contains RequestId as the 1st
 261                  * field
 262                  */
 263                 if (request->request_msg.msg.init_req.req_id
 264                     == resp->msg.init_complete.req_id) {
 265                         found = true;
 266                         break;
 267                 }
 268         }
 269         spin_unlock_irqrestore(&dev->request_lock, flags);
 270
 271         if (found) {
 272                 if (resp->msg_len <=
 273                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 274                         memcpy(&request->response_msg, resp,
 275                                resp->msg_len);
 276                 } else {
 277                         netdev_err(ndev,
 278                                 "rndis response buffer overflow "
 279                                 "detected (size %u max %zu)\n",
 280                                 resp->msg_len,
 281                                 sizeof(struct rndis_filter_packet));
 282
 283                         if (resp->ndis_msg_type ==
 284                             RNDIS_MSG_RESET_C) {
 285                                 /* does not have a request id field */
 286                                 request->response_msg.msg.reset_complete.
 287                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 288                         } else {
 289                                 request->response_msg.msg.
 290                                 init_complete.status =
 291                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 292                         }
 293                 }
 294
 295                 complete(&request->wait_event);
 296         } else {
 297                 netdev_err(ndev,
 298                         "no rndis request found for this response "
 299                         "(id 0x%x res type 0x%x)\n",
 300                         resp->msg.init_complete.req_id,
 301                         resp->ndis_msg_type);
 302         }
 303 }
 304
 305 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 306                                              struct rndis_message *resp)
 307 {
 308         struct rndis_indicate_status *indicate =
 309                         &resp->msg.indicate_status;
 310
 311         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 312                 netvsc_linkstatus_callback(
 313                         dev->net_dev->dev, 1);
 314         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 315                 netvsc_linkstatus_callback(
 316                         dev->net_dev->dev, 0);
 317         } else {
 318                 /*
 319                  * TODO:
 320                  */
 321         }
 322 }
 323
 324 /*
 325  * Get the Per-Packet-Info with the specified type
 326  * return NULL if not found.
 327  */
 328 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 329 {
 330         struct rndis_per_packet_info *ppi;
 331         int len;
 332
 333         if (rpkt->per_pkt_info_offset == 0)
 334                 return NULL;
 335
 336         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 337                 rpkt->per_pkt_info_offset);
 338         len = rpkt->per_pkt_info_len;
 339
 340         while (len > 0) {
 341                 if (ppi->type == type)
 342                         return (void *)((ulong)ppi + ppi->ppi_offset);
 343                 len -= ppi->size;
 344                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 345         }
 346
 347         return NULL;
 348 }
 349
 350 static void rndis_filter_receive_data(struct rndis_device *dev,
 351                                    struct rndis_message *msg,
 352                                    struct hv_netvsc_packet *pkt)
 353 {
 354         struct rndis_packet *rndis_pkt;
 355         u32 data_offset;
 356         struct ndis_pkt_8021q_info *vlan;
 357
 358         rndis_pkt = &msg->msg.pkt;
 359
 360         /* Remove the rndis header and pass it back up the stack */
 361         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 362
 363         pkt->total_data_buflen -= data_offset;
 364
 365         /*
 366          * Make sure we got a valid RNDIS message, now total_data_buflen
 367          * should be the data packet size plus the trailer padding size
 368          */
 369         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 370                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 371                            "overflow detected (got %u, min %u)"
 372                            "...dropping this message!\n",
 373                            pkt->total_data_buflen, rndis_pkt->data_len);
 374                 return;
 375         }
 376
 377         /*
 378          * Remove the rndis trailer padding from rndis packet message
 379          * rndis_pkt->data_len tell us the real data length, we only copy
 380          * the data packet to the stack, without the rndis trailer padding
 381          */
 382         pkt->total_data_buflen = rndis_pkt->data_len;
 383         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 384
 385         pkt->is_data_pkt = true;
 386
 387         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 388         if (vlan) {
 389                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 390                         (vlan->pri << VLAN_PRIO_SHIFT);
 391         } else {
 392                 pkt->vlan_tci = 0;
 393         }
 394
 395         netvsc_recv_callback(dev->net_dev->dev, pkt);
 396 }
 397
 398 int rndis_filter_receive(struct hv_device *dev,
 399                                 struct hv_netvsc_packet *pkt)
 400 {
 401         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 402         struct rndis_device *rndis_dev;
 403         struct rndis_message *rndis_msg;
 404         struct net_device *ndev;
 405         int ret = 0;
 406
 407         if (!net_dev) {
 408                 ret = -EINVAL;
 409                 goto exit;
 410         }
 411
 412         ndev = net_dev->ndev;
 413
 414         /* Make sure the rndis device state is initialized */
 415         if (!net_dev->extension) {
 416                 netdev_err(ndev, "got rndis message but no rndis device - "
 417                           "dropping this message!\n");
 418                 ret = -ENODEV;
 419                 goto exit;
 420         }
 421
 422         rndis_dev = (struct rndis_device *)net_dev->extension;
 423         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 424                 netdev_err(ndev, "got rndis message but rndis device "
 425                            "uninitialized...dropping this message!\n");
 426                 ret = -ENODEV;
 427                 goto exit;
 428         }
 429
 430         rndis_msg = pkt->data;
 431
 432         dump_rndis_message(dev, rndis_msg);
 433
 434         switch (rndis_msg->ndis_msg_type) {
 435         case RNDIS_MSG_PACKET:
 436                 /* data msg */
 437                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 438                 break;
 439
 440         case RNDIS_MSG_INIT_C:
 441         case RNDIS_MSG_QUERY_C:
 442         case RNDIS_MSG_SET_C:
 443                 /* completion msgs */
 444                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 445                 break;
 446
 447         case RNDIS_MSG_INDICATE:
 448                 /* notification msgs */
 449                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 450                 break;
 451         default:
 452                 netdev_err(ndev,
 453                         "unhandled rndis message (type %u len %u)\n",
 454                            rndis_msg->ndis_msg_type,
 455                            rndis_msg->msg_len);
 456                 break;
 457         }
 458
 459 exit:
 460         if (ret != 0)
 461                 pkt->status = NVSP_STAT_FAIL;
 462
 463         return ret;
 464 }
 465
 466 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 467                                   void *result, u32 *result_size)
 468 {
 469         struct rndis_request *request;
 470         u32 inresult_size = *result_size;
 471         struct rndis_query_request *query;
 472         struct rndis_query_complete *query_complete;
 473         int ret = 0;
 474         int t;
 475
 476         if (!result)
 477                 return -EINVAL;
 478
 479         *result_size = 0;
 480         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 481                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 482         if (!request) {
 483                 ret = -ENOMEM;
 484                 goto cleanup;
 485         }
 486
 487         /* Setup the rndis query */
 488         query = &request->request_msg.msg.query_req;
 489         query->oid = oid;
 490         query->info_buf_offset = sizeof(struct rndis_query_request);
 491         query->info_buflen = 0;
 492         query->dev_vc_handle = 0;
 493
 494         ret = rndis_filter_send_request(dev, request);
 495         if (ret != 0)
 496                 goto cleanup;
 497
 498         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 499         if (t == 0) {
 500                 ret = -ETIMEDOUT;
 501                 goto cleanup;
 502         }
 503
 504         /* Copy the response back */
 505         query_complete = &request->response_msg.msg.query_complete;
 506
 507         if (query_complete->info_buflen > inresult_size) {
 508                 ret = -1;
 509                 goto cleanup;
 510         }
 511
 512         memcpy(result,
 513                (void *)((unsigned long)query_complete +
 514                          query_complete->info_buf_offset),
 515                query_complete->info_buflen);
 516
 517         *result_size = query_complete->info_buflen;
 518
 519 cleanup:
 520         if (request)
 521                 put_rndis_request(dev, request);
 522
 523         return ret;
 524 }
 525
 526 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 527 {
 528         u32 size = ETH_ALEN;
 529
 530         return rndis_filter_query_device(dev,
 531                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 532                                       dev->hw_mac_adr, &size);
 533 }
 534
 535 #define NWADR_STR "NetworkAddress"
 536 #define NWADR_STRLEN 14
 537
 538 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 539 {
 540         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 541         struct rndis_device *rdev = nvdev->extension;
 542         struct net_device *ndev = nvdev->ndev;
 543         struct rndis_request *request;
 544         struct rndis_set_request *set;
 545         struct rndis_config_parameter_info *cpi;
 546         wchar_t *cfg_nwadr, *cfg_mac;
 547         struct rndis_set_complete *set_complete;
 548         char macstr[2*ETH_ALEN+1];
 549         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 550                 2*NWADR_STRLEN + 4*ETH_ALEN;
 551         int ret, t;
 552
 553         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 554                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 555         if (!request)
 556                 return -ENOMEM;
 557
 558         set = &request->request_msg.msg.set_req;
 559         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 560         set->info_buflen = extlen;
 561         set->info_buf_offset = sizeof(struct rndis_set_request);
 562         set->dev_vc_handle = 0;
 563
 564         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 565                 set->info_buf_offset);
 566         cpi->parameter_name_offset =
 567                 sizeof(struct rndis_config_parameter_info);
 568         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 569         cpi->parameter_name_length = 2*NWADR_STRLEN;
 570         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 571         cpi->parameter_value_offset =
 572                 cpi->parameter_name_offset + cpi->parameter_name_length;
 573         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 574         cpi->parameter_value_length = 4*ETH_ALEN;
 575
 576         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 577         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 578         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 579                               cfg_nwadr, NWADR_STRLEN);
 580         if (ret < 0)
 581                 goto cleanup;
 582         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 583         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 584                               cfg_mac, 2*ETH_ALEN);
 585         if (ret < 0)
 586                 goto cleanup;
 587
 588         ret = rndis_filter_send_request(rdev, request);
 589         if (ret != 0)
 590                 goto cleanup;
 591
 592         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 593         if (t == 0) {
 594                 netdev_err(ndev, "timeout before we got a set response...\n");
 595                 /*
 596                  * can't put_rndis_request, since we may still receive a
 597                  * send-completion.
 598                  */
 599                 return -EBUSY;
 600         } else {
 601                 set_complete = &request->response_msg.msg.set_complete;
 602                 if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 603                         netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
 604                                    set_complete->status);
 605                         ret = -EINVAL;
 606                 }
 607         }
 608
 609 cleanup:
 610         put_rndis_request(rdev, request);
 611         return ret;
 612 }
 613
 614
 615 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 616 {
 617         u32 size = sizeof(u32);
 618         u32 link_status;
 619         int ret;
 620
 621         ret = rndis_filter_query_device(dev,
 622                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 623                                       &link_status, &size);
 624         dev->link_state = (link_status != 0) ? true : false;
 625
 626         return ret;
 627 }
 628
 629 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 630 {
 631         struct rndis_request *request;
 632         struct rndis_set_request *set;
 633         struct rndis_set_complete *set_complete;
 634         u32 status;
 635         int ret, t;
 636         struct net_device *ndev;
 637
 638         ndev = dev->net_dev->ndev;
 639
 640         request = get_rndis_request(dev, RNDIS_MSG_SET,
 641                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 642                         sizeof(u32));
 643         if (!request) {
 644                 ret = -ENOMEM;
 645                 goto cleanup;
 646         }
 647
 648         /* Setup the rndis set */
 649         set = &request->request_msg.msg.set_req;
 650         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 651         set->info_buflen = sizeof(u32);
 652         set->info_buf_offset = sizeof(struct rndis_set_request);
 653
 654         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 655                &new_filter, sizeof(u32));
 656
 657         ret = rndis_filter_send_request(dev, request);
 658         if (ret != 0)
 659                 goto cleanup;
 660
 661         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 662
 663         if (t == 0) {
 664                 netdev_err(ndev,
 665                         "timeout before we got a set response...\n");
 666                 ret = -ETIMEDOUT;
 667                 /*
 668                  * We can't deallocate the request since we may still receive a
 669                  * send completion for it.
 670                  */
 671                 goto exit;
 672         } else {
 673                 set_complete = &request->response_msg.msg.set_complete;
 674                 status = set_complete->status;
 675         }
 676
 677 cleanup:
 678         if (request)
 679                 put_rndis_request(dev, request);
 680 exit:
 681         return ret;
 682 }
 683
 684
 685 static int rndis_filter_init_device(struct rndis_device *dev)
 686 {
 687         struct rndis_request *request;
 688         struct rndis_initialize_request *init;
 689         struct rndis_initialize_complete *init_complete;
 690         u32 status;
 691         int ret, t;
 692
 693         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 694                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 695         if (!request) {
 696                 ret = -ENOMEM;
 697                 goto cleanup;
 698         }
 699
 700         /* Setup the rndis set */
 701         init = &request->request_msg.msg.init_req;
 702         init->major_ver = RNDIS_MAJOR_VERSION;
 703         init->minor_ver = RNDIS_MINOR_VERSION;
 704         init->max_xfer_size = 0x4000;
 705
 706         dev->state = RNDIS_DEV_INITIALIZING;
 707
 708         ret = rndis_filter_send_request(dev, request);
 709         if (ret != 0) {
 710                 dev->state = RNDIS_DEV_UNINITIALIZED;
 711                 goto cleanup;
 712         }
 713
 714
 715         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 716
 717         if (t == 0) {
 718                 ret = -ETIMEDOUT;
 719                 goto cleanup;
 720         }
 721
 722         init_complete = &request->response_msg.msg.init_complete;
 723         status = init_complete->status;
 724         if (status == RNDIS_STATUS_SUCCESS) {
 725                 dev->state = RNDIS_DEV_INITIALIZED;
 726                 ret = 0;
 727         } else {
 728                 dev->state = RNDIS_DEV_UNINITIALIZED;
 729                 ret = -EINVAL;
 730         }
 731
 732 cleanup:
 733         if (request)
 734                 put_rndis_request(dev, request);
 735
 736         return ret;
 737 }
 738
 739 static void rndis_filter_halt_device(struct rndis_device *dev)
 740 {
 741         struct rndis_request *request;
 742         struct rndis_halt_request *halt;
 743         struct netvsc_device *nvdev = dev->net_dev;
 744         struct hv_device *hdev = nvdev->dev;
 745         ulong flags;
 746
 747         /* Attempt to do a rndis device halt */
 748         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 749                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 750         if (!request)
 751                 goto cleanup;
 752
 753         /* Setup the rndis set */
 754         halt = &request->request_msg.msg.halt_req;
 755         halt->req_id = atomic_inc_return(&dev->new_req_id);
 756
 757         /* Ignore return since this msg is optional. */
 758         rndis_filter_send_request(dev, request);
 759
 760         dev->state = RNDIS_DEV_UNINITIALIZED;
 761
 762 cleanup:
 763         spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
 764         nvdev->destroy = true;
 765         spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
 766
 767         /* Wait for all send completions */
 768         wait_event(nvdev->wait_drain,
 769                 atomic_read(&nvdev->num_outstanding_sends) == 0);
 770
 771         if (request)
 772                 put_rndis_request(dev, request);
 773         return;
 774 }
 775
 776 static int rndis_filter_open_device(struct rndis_device *dev)
 777 {
 778         int ret;
 779
 780         if (dev->state != RNDIS_DEV_INITIALIZED)
 781                 return 0;
 782
 783         ret = rndis_filter_set_packet_filter(dev,
 784                                          NDIS_PACKET_TYPE_BROADCAST |
 785                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 786                                          NDIS_PACKET_TYPE_DIRECTED);
 787         if (ret == 0)
 788                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 789
 790         return ret;
 791 }
 792
 793 static int rndis_filter_close_device(struct rndis_device *dev)
 794 {
 795         int ret;
 796
 797         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 798                 return 0;
 799
 800         ret = rndis_filter_set_packet_filter(dev, 0);
 801         if (ret == 0)
 802                 dev->state = RNDIS_DEV_INITIALIZED;
 803
 804         return ret;
 805 }
 806
 807 int rndis_filter_device_add(struct hv_device *dev,
 808                                   void *additional_info)
 809 {
 810         int ret;
 811         struct netvsc_device *net_device;
 812         struct rndis_device *rndis_device;
 813         struct netvsc_device_info *device_info = additional_info;
 814
 815         rndis_device = get_rndis_device();
 816         if (!rndis_device)
 817                 return -ENODEV;
 818
 819         /*
 820          * Let the inner driver handle this first to create the netvsc channel
 821          * NOTE! Once the channel is created, we may get a receive callback
 822          * (RndisFilterOnReceive()) before this call is completed
 823          */
 824         ret = netvsc_device_add(dev, additional_info);
 825         if (ret != 0) {
 826                 kfree(rndis_device);
 827                 return ret;
 828         }
 829
 830
 831         /* Initialize the rndis device */
 832         net_device = hv_get_drvdata(dev);
 833
 834         net_device->extension = rndis_device;
 835         rndis_device->net_dev = net_device;
 836
 837         /* Send the rndis initialization message */
 838         ret = rndis_filter_init_device(rndis_device);
 839         if (ret != 0) {
 840                 rndis_filter_device_remove(dev);
 841                 return ret;
 842         }
 843
 844         /* Get the mac address */
 845         ret = rndis_filter_query_device_mac(rndis_device);
 846         if (ret != 0) {
 847                 rndis_filter_device_remove(dev);
 848                 return ret;
 849         }
 850
 851         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 852
 853         rndis_filter_query_device_link_status(rndis_device);
 854
 855         device_info->link_state = rndis_device->link_state;
 856
 857         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 858                  rndis_device->hw_mac_adr,
 859                  device_info->link_state ? "down" : "up");
 860
 861         return ret;
 862 }
 863
 864 void rndis_filter_device_remove(struct hv_device *dev)
 865 {
 866         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 867         struct rndis_device *rndis_dev = net_dev->extension;
 868
 869         /* Halt and release the rndis device */
 870         rndis_filter_halt_device(rndis_dev);
 871
 872         kfree(rndis_dev);
 873         net_dev->extension = NULL;
 874
 875         netvsc_device_remove(dev);
 876 }
 877
 878
 879 int rndis_filter_open(struct hv_device *dev)
 880 {
 881         struct netvsc_device *net_device = hv_get_drvdata(dev);
 882
 883         if (!net_device)
 884                 return -EINVAL;
 885
 886         return rndis_filter_open_device(net_device->extension);
 887 }
 888
 889 int rndis_filter_close(struct hv_device *dev)
 890 {
 891         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 892
 893         if (!nvdev)
 894                 return -EINVAL;
 895
 896         return rndis_filter_close_device(nvdev->extension);
 897 }
 898
 899 int rndis_filter_send(struct hv_device *dev,
 900                              struct hv_netvsc_packet *pkt)
 901 {
 902         int ret;
 903         struct rndis_filter_packet *filter_pkt;
 904         struct rndis_message *rndis_msg;
 905         struct rndis_packet *rndis_pkt;
 906         u32 rndis_msg_size;
 907         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 908
 909         /* Add the rndis header */
 910         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 911
 912         rndis_msg = &filter_pkt->msg;
 913         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 914         if (isvlan)
 915                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 916
 917         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 918         rndis_msg->msg_len = pkt->total_data_buflen +
 919                                       rndis_msg_size;
 920
 921         rndis_pkt = &rndis_msg->msg.pkt;
 922         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 923         if (isvlan)
 924                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 925         rndis_pkt->data_len = pkt->total_data_buflen;
 926
 927         if (isvlan) {
 928                 struct rndis_per_packet_info *ppi;
 929                 struct ndis_pkt_8021q_info *vlan;
 930
 931                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 932                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 933
 934                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 935                         rndis_pkt->per_pkt_info_offset);
 936                 ppi->size = NDIS_VLAN_PPI_SIZE;
 937                 ppi->type = IEEE_8021Q_INFO;
 938                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 939
 940                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 941                         ppi->ppi_offset);
 942                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 943                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 944         }
 945
 946         pkt->is_data_pkt = true;
 947         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 948         pkt->page_buf[0].offset =
 949                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 950         pkt->page_buf[0].len = rndis_msg_size;
 951
 952         /* Add one page_buf if the rndis msg goes beyond page boundary */
 953         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 954                 int i;
 955                 for (i = pkt->page_buf_cnt; i > 1; i--)
 956                         pkt->page_buf[i] = pkt->page_buf[i-1];
 957                 pkt->page_buf_cnt++;
 958                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 959                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 960                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 961                 pkt->page_buf[1].offset = 0;
 962                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 963         }
 964
 965         /* Save the packet send completion and context */
 966         filter_pkt->completion = pkt->completion.send.send_completion;
 967         filter_pkt->completion_ctx =
 968                                 pkt->completion.send.send_completion_ctx;
 969
 970         /* Use ours */
 971         pkt->completion.send.send_completion = rndis_filter_send_completion;
 972         pkt->completion.send.send_completion_ctx = filter_pkt;
 973
 974         ret = netvsc_send(dev, pkt);
 975         if (ret != 0) {
 976                 /*
 977                  * Reset the completion to originals to allow retries from
 978                  * above
 979                  */
 980                 pkt->completion.send.send_completion =
 981                                 filter_pkt->completion;
 982                 pkt->completion.send.send_completion_ctx =
 983                                 filter_pkt->completion_ctx;
 984         }
 985
 986         return ret;
 987 }
 988
 989 static void rndis_filter_send_completion(void *ctx)
 990 {
 991         struct rndis_filter_packet *filter_pkt = ctx;
 992
 993         /* Pass it back to the original handler */
 994         filter_pkt->completion(filter_pkt->completion_ctx);
 995 }