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