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 static void rndis_filter_send_request_completion(void *ctx);
  65
  66
  67
  68 static struct rndis_device *get_rndis_device(void)
  69 {
  70         struct rndis_device *device;
  71
  72         device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
  73         if (!device)
  74                 return NULL;
  75
  76         spin_lock_init(&device->request_lock);
  77
  78         INIT_LIST_HEAD(&device->req_list);
  79
  80         device->state = RNDIS_DEV_UNINITIALIZED;
  81
  82         return device;
  83 }
  84
  85 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
  86                                              u32 msg_type,
  87                                              u32 msg_len)
  88 {
  89         struct rndis_request *request;
  90         struct rndis_message *rndis_msg;
  91         struct rndis_set_request *set;
  92         unsigned long flags;
  93
  94         request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
  95         if (!request)
  96                 return NULL;
  97
  98         init_completion(&request->wait_event);
  99
 100         rndis_msg = &request->request_msg;
 101         rndis_msg->ndis_msg_type = msg_type;
 102         rndis_msg->msg_len = msg_len;
 103
 104         /*
 105          * Set the request id. This field is always after the rndis header for
 106          * request/response packet types so we just used the SetRequest as a
 107          * template
 108          */
 109         set = &rndis_msg->msg.set_req;
 110         set->req_id = atomic_inc_return(&dev->new_req_id);
 111
 112         /* Add to the request list */
 113         spin_lock_irqsave(&dev->request_lock, flags);
 114         list_add_tail(&request->list_ent, &dev->req_list);
 115         spin_unlock_irqrestore(&dev->request_lock, flags);
 116
 117         return request;
 118 }
 119
 120 static void put_rndis_request(struct rndis_device *dev,
 121                             struct rndis_request *req)
 122 {
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&dev->request_lock, flags);
 126         list_del(&req->list_ent);
 127         spin_unlock_irqrestore(&dev->request_lock, flags);
 128
 129         kfree(req);
 130 }
 131
 132 static void dump_rndis_message(struct hv_device *hv_dev,
 133                         struct rndis_message *rndis_msg)
 134 {
 135         struct net_device *netdev;
 136         struct netvsc_device *net_device;
 137
 138         net_device = hv_get_drvdata(hv_dev);
 139         netdev = net_device->ndev;
 140
 141         switch (rndis_msg->ndis_msg_type) {
 142         case RNDIS_MSG_PACKET:
 143                 netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
 144                            "data offset %u data len %u, # oob %u, "
 145                            "oob offset %u, oob len %u, pkt offset %u, "
 146                            "pkt len %u\n",
 147                            rndis_msg->msg_len,
 148                            rndis_msg->msg.pkt.data_offset,
 149                            rndis_msg->msg.pkt.data_len,
 150                            rndis_msg->msg.pkt.num_oob_data_elements,
 151                            rndis_msg->msg.pkt.oob_data_offset,
 152                            rndis_msg->msg.pkt.oob_data_len,
 153                            rndis_msg->msg.pkt.per_pkt_info_offset,
 154                            rndis_msg->msg.pkt.per_pkt_info_len);
 155                 break;
 156
 157         case RNDIS_MSG_INIT_C:
 158                 netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
 159                         "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
 160                         "device flags %d, max xfer size 0x%x, max pkts %u, "
 161                         "pkt aligned %u)\n",
 162                         rndis_msg->msg_len,
 163                         rndis_msg->msg.init_complete.req_id,
 164                         rndis_msg->msg.init_complete.status,
 165                         rndis_msg->msg.init_complete.major_ver,
 166                         rndis_msg->msg.init_complete.minor_ver,
 167                         rndis_msg->msg.init_complete.dev_flags,
 168                         rndis_msg->msg.init_complete.max_xfer_size,
 169                         rndis_msg->msg.init_complete.
 170                            max_pkt_per_msg,
 171                         rndis_msg->msg.init_complete.
 172                            pkt_alignment_factor);
 173                 break;
 174
 175         case RNDIS_MSG_QUERY_C:
 176                 netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
 177                         "(len %u, id 0x%x, status 0x%x, buf len %u, "
 178                         "buf offset %u)\n",
 179                         rndis_msg->msg_len,
 180                         rndis_msg->msg.query_complete.req_id,
 181                         rndis_msg->msg.query_complete.status,
 182                         rndis_msg->msg.query_complete.
 183                            info_buflen,
 184                         rndis_msg->msg.query_complete.
 185                            info_buf_offset);
 186                 break;
 187
 188         case RNDIS_MSG_SET_C:
 189                 netdev_dbg(netdev,
 190                         "RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
 191                         rndis_msg->msg_len,
 192                         rndis_msg->msg.set_complete.req_id,
 193                         rndis_msg->msg.set_complete.status);
 194                 break;
 195
 196         case RNDIS_MSG_INDICATE:
 197                 netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
 198                         "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
 199                         rndis_msg->msg_len,
 200                         rndis_msg->msg.indicate_status.status,
 201                         rndis_msg->msg.indicate_status.status_buflen,
 202                         rndis_msg->msg.indicate_status.status_buf_offset);
 203                 break;
 204
 205         default:
 206                 netdev_dbg(netdev, "0x%x (len %u)\n",
 207                         rndis_msg->ndis_msg_type,
 208                         rndis_msg->msg_len);
 209                 break;
 210         }
 211 }
 212
 213 static int rndis_filter_send_request(struct rndis_device *dev,
 214                                   struct rndis_request *req)
 215 {
 216         int ret;
 217         struct hv_netvsc_packet *packet;
 218
 219         /* Setup the packet to send it */
 220         packet = &req->pkt;
 221
 222         packet->is_data_pkt = false;
 223         packet->total_data_buflen = req->request_msg.msg_len;
 224         packet->page_buf_cnt = 1;
 225
 226         packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
 227                                         PAGE_SHIFT;
 228         packet->page_buf[0].len = req->request_msg.msg_len;
 229         packet->page_buf[0].offset =
 230                 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
 231
 232         /* Add one page_buf when request_msg crossing page boundary */
 233         if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
 234                 packet->page_buf_cnt++;
 235                 packet->page_buf[0].len = PAGE_SIZE -
 236                         packet->page_buf[0].offset;
 237                 packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
 238                         + packet->page_buf[0].len) >> PAGE_SHIFT;
 239                 packet->page_buf[1].offset = 0;
 240                 packet->page_buf[1].len = req->request_msg.msg_len -
 241                         packet->page_buf[0].len;
 242         }
 243
 244         packet->completion.send.send_completion_ctx = req;/* packet; */
 245         packet->completion.send.send_completion =
 246                 rndis_filter_send_request_completion;
 247         packet->completion.send.send_completion_tid = (unsigned long)dev;
 248
 249         ret = netvsc_send(dev->net_dev->dev, packet);
 250         return ret;
 251 }
 252
 253 static void rndis_filter_receive_response(struct rndis_device *dev,
 254                                        struct rndis_message *resp)
 255 {
 256         struct rndis_request *request = NULL;
 257         bool found = false;
 258         unsigned long flags;
 259         struct net_device *ndev;
 260
 261         ndev = dev->net_dev->ndev;
 262
 263         spin_lock_irqsave(&dev->request_lock, flags);
 264         list_for_each_entry(request, &dev->req_list, list_ent) {
 265                 /*
 266                  * All request/response message contains RequestId as the 1st
 267                  * field
 268                  */
 269                 if (request->request_msg.msg.init_req.req_id
 270                     == resp->msg.init_complete.req_id) {
 271                         found = true;
 272                         break;
 273                 }
 274         }
 275         spin_unlock_irqrestore(&dev->request_lock, flags);
 276
 277         if (found) {
 278                 if (resp->msg_len <=
 279                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 280                         memcpy(&request->response_msg, resp,
 281                                resp->msg_len);
 282                 } else {
 283                         netdev_err(ndev,
 284                                 "rndis response buffer overflow "
 285                                 "detected (size %u max %zu)\n",
 286                                 resp->msg_len,
 287                                 sizeof(struct rndis_filter_packet));
 288
 289                         if (resp->ndis_msg_type ==
 290                             RNDIS_MSG_RESET_C) {
 291                                 /* does not have a request id field */
 292                                 request->response_msg.msg.reset_complete.
 293                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 294                         } else {
 295                                 request->response_msg.msg.
 296                                 init_complete.status =
 297                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 298                         }
 299                 }
 300
 301                 complete(&request->wait_event);
 302         } else {
 303                 netdev_err(ndev,
 304                         "no rndis request found for this response "
 305                         "(id 0x%x res type 0x%x)\n",
 306                         resp->msg.init_complete.req_id,
 307                         resp->ndis_msg_type);
 308         }
 309 }
 310
 311 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 312                                              struct rndis_message *resp)
 313 {
 314         struct rndis_indicate_status *indicate =
 315                         &resp->msg.indicate_status;
 316
 317         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 318                 netvsc_linkstatus_callback(
 319                         dev->net_dev->dev, 1);
 320         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 321                 netvsc_linkstatus_callback(
 322                         dev->net_dev->dev, 0);
 323         } else {
 324                 /*
 325                  * TODO:
 326                  */
 327         }
 328 }
 329
 330 /*
 331  * Get the Per-Packet-Info with the specified type
 332  * return NULL if not found.
 333  */
 334 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 335 {
 336         struct rndis_per_packet_info *ppi;
 337         int len;
 338
 339         if (rpkt->per_pkt_info_offset == 0)
 340                 return NULL;
 341
 342         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 343                 rpkt->per_pkt_info_offset);
 344         len = rpkt->per_pkt_info_len;
 345
 346         while (len > 0) {
 347                 if (ppi->type == type)
 348                         return (void *)((ulong)ppi + ppi->ppi_offset);
 349                 len -= ppi->size;
 350                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static void rndis_filter_receive_data(struct rndis_device *dev,
 357                                    struct rndis_message *msg,
 358                                    struct hv_netvsc_packet *pkt)
 359 {
 360         struct rndis_packet *rndis_pkt;
 361         u32 data_offset;
 362         struct ndis_pkt_8021q_info *vlan;
 363
 364         rndis_pkt = &msg->msg.pkt;
 365
 366         /*
 367          * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
 368          * netvsc packet (ie TotalDataBufferLength != MessageLength)
 369          */
 370
 371         /* Remove the rndis header and pass it back up the stack */
 372         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 373
 374         pkt->total_data_buflen -= data_offset;
 375
 376         /*
 377          * Make sure we got a valid RNDIS message, now total_data_buflen
 378          * should be the data packet size plus the trailer padding size
 379          */
 380         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 381                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 382                            "overflow detected (got %u, min %u)"
 383                            "...dropping this message!\n",
 384                            pkt->total_data_buflen, rndis_pkt->data_len);
 385                 return;
 386         }
 387
 388         /*
 389          * Remove the rndis trailer padding from rndis packet message
 390          * rndis_pkt->data_len tell us the real data length, we only copy
 391          * the data packet to the stack, without the rndis trailer padding
 392          */
 393         pkt->total_data_buflen = rndis_pkt->data_len;
 394         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 395
 396         pkt->is_data_pkt = true;
 397
 398         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 399         if (vlan) {
 400                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 401                         (vlan->pri << VLAN_PRIO_SHIFT);
 402         } else {
 403                 pkt->vlan_tci = 0;
 404         }
 405
 406         netvsc_recv_callback(dev->net_dev->dev, pkt);
 407 }
 408
 409 int rndis_filter_receive(struct hv_device *dev,
 410                                 struct hv_netvsc_packet *pkt)
 411 {
 412         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 413         struct rndis_device *rndis_dev;
 414         struct rndis_message *rndis_msg;
 415         struct net_device *ndev;
 416         int ret = 0;
 417
 418         if (!net_dev) {
 419                 ret = -EINVAL;
 420                 goto exit;
 421         }
 422
 423         ndev = net_dev->ndev;
 424
 425         /* Make sure the rndis device state is initialized */
 426         if (!net_dev->extension) {
 427                 netdev_err(ndev, "got rndis message but no rndis device - "
 428                           "dropping this message!\n");
 429                 ret = -ENODEV;
 430                 goto exit;
 431         }
 432
 433         rndis_dev = (struct rndis_device *)net_dev->extension;
 434         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 435                 netdev_err(ndev, "got rndis message but rndis device "
 436                            "uninitialized...dropping this message!\n");
 437                 ret = -ENODEV;
 438                 goto exit;
 439         }
 440
 441         rndis_msg = pkt->data;
 442
 443         dump_rndis_message(dev, rndis_msg);
 444
 445         switch (rndis_msg->ndis_msg_type) {
 446         case RNDIS_MSG_PACKET:
 447                 /* data msg */
 448                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 449                 break;
 450
 451         case RNDIS_MSG_INIT_C:
 452         case RNDIS_MSG_QUERY_C:
 453         case RNDIS_MSG_SET_C:
 454                 /* completion msgs */
 455                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 456                 break;
 457
 458         case RNDIS_MSG_INDICATE:
 459                 /* notification msgs */
 460                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 461                 break;
 462         default:
 463                 netdev_err(ndev,
 464                         "unhandled rndis message (type %u len %u)\n",
 465                            rndis_msg->ndis_msg_type,
 466                            rndis_msg->msg_len);
 467                 break;
 468         }
 469
 470 exit:
 471         if (ret != 0)
 472                 pkt->status = NVSP_STAT_FAIL;
 473
 474         return ret;
 475 }
 476
 477 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 478                                   void *result, u32 *result_size)
 479 {
 480         struct rndis_request *request;
 481         u32 inresult_size = *result_size;
 482         struct rndis_query_request *query;
 483         struct rndis_query_complete *query_complete;
 484         int ret = 0;
 485         int t;
 486
 487         if (!result)
 488                 return -EINVAL;
 489
 490         *result_size = 0;
 491         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 492                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 493         if (!request) {
 494                 ret = -ENOMEM;
 495                 goto cleanup;
 496         }
 497
 498         /* Setup the rndis query */
 499         query = &request->request_msg.msg.query_req;
 500         query->oid = oid;
 501         query->info_buf_offset = sizeof(struct rndis_query_request);
 502         query->info_buflen = 0;
 503         query->dev_vc_handle = 0;
 504
 505         ret = rndis_filter_send_request(dev, request);
 506         if (ret != 0)
 507                 goto cleanup;
 508
 509         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 510         if (t == 0) {
 511                 ret = -ETIMEDOUT;
 512                 goto cleanup;
 513         }
 514
 515         /* Copy the response back */
 516         query_complete = &request->response_msg.msg.query_complete;
 517
 518         if (query_complete->info_buflen > inresult_size) {
 519                 ret = -1;
 520                 goto cleanup;
 521         }
 522
 523         memcpy(result,
 524                (void *)((unsigned long)query_complete +
 525                          query_complete->info_buf_offset),
 526                query_complete->info_buflen);
 527
 528         *result_size = query_complete->info_buflen;
 529
 530 cleanup:
 531         if (request)
 532                 put_rndis_request(dev, request);
 533
 534         return ret;
 535 }
 536
 537 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 538 {
 539         u32 size = ETH_ALEN;
 540
 541         return rndis_filter_query_device(dev,
 542                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 543                                       dev->hw_mac_adr, &size);
 544 }
 545
 546 #define NWADR_STR "NetworkAddress"
 547 #define NWADR_STRLEN 14
 548
 549 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 550 {
 551         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 552         struct rndis_device *rdev = nvdev->extension;
 553         struct net_device *ndev = nvdev->ndev;
 554         struct rndis_request *request;
 555         struct rndis_set_request *set;
 556         struct rndis_config_parameter_info *cpi;
 557         wchar_t *cfg_nwadr, *cfg_mac;
 558         struct rndis_set_complete *set_complete;
 559         char macstr[2*ETH_ALEN+1];
 560         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 561                 2*NWADR_STRLEN + 4*ETH_ALEN;
 562         int ret, t;
 563
 564         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 565                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 566         if (!request)
 567                 return -ENOMEM;
 568
 569         set = &request->request_msg.msg.set_req;
 570         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 571         set->info_buflen = extlen;
 572         set->info_buf_offset = sizeof(struct rndis_set_request);
 573         set->dev_vc_handle = 0;
 574
 575         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 576                 set->info_buf_offset);
 577         cpi->parameter_name_offset =
 578                 sizeof(struct rndis_config_parameter_info);
 579         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 580         cpi->parameter_name_length = 2*NWADR_STRLEN;
 581         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 582         cpi->parameter_value_offset =
 583                 cpi->parameter_name_offset + cpi->parameter_name_length;
 584         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 585         cpi->parameter_value_length = 4*ETH_ALEN;
 586
 587         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 588         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 589         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 590                               cfg_nwadr, NWADR_STRLEN);
 591         if (ret < 0)
 592                 goto cleanup;
 593         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 594         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 595                               cfg_mac, 2*ETH_ALEN);
 596         if (ret < 0)
 597                 goto cleanup;
 598
 599         ret = rndis_filter_send_request(rdev, request);
 600         if (ret != 0)
 601                 goto cleanup;
 602
 603         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 604         if (t == 0) {
 605                 netdev_err(ndev, "timeout before we got a set response...\n");
 606                 /*
 607                  * can't put_rndis_request, since we may still receive a
 608                  * send-completion.
 609                  */
 610                 return -EBUSY;
 611         } else {
 612                 set_complete = &request->response_msg.msg.set_complete;
 613                 if (set_complete->status != RNDIS_STATUS_SUCCESS)
 614                         ret = -EINVAL;
 615         }
 616
 617 cleanup:
 618         put_rndis_request(rdev, request);
 619         return ret;
 620 }
 621
 622
 623 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 624 {
 625         u32 size = sizeof(u32);
 626         u32 link_status;
 627         int ret;
 628
 629         ret = rndis_filter_query_device(dev,
 630                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 631                                       &link_status, &size);
 632         dev->link_state = (link_status != 0) ? true : false;
 633
 634         return ret;
 635 }
 636
 637 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 638 {
 639         struct rndis_request *request;
 640         struct rndis_set_request *set;
 641         struct rndis_set_complete *set_complete;
 642         u32 status;
 643         int ret, t;
 644         struct net_device *ndev;
 645
 646         ndev = dev->net_dev->ndev;
 647
 648         request = get_rndis_request(dev, RNDIS_MSG_SET,
 649                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 650                         sizeof(u32));
 651         if (!request) {
 652                 ret = -ENOMEM;
 653                 goto cleanup;
 654         }
 655
 656         /* Setup the rndis set */
 657         set = &request->request_msg.msg.set_req;
 658         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 659         set->info_buflen = sizeof(u32);
 660         set->info_buf_offset = sizeof(struct rndis_set_request);
 661
 662         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 663                &new_filter, sizeof(u32));
 664
 665         ret = rndis_filter_send_request(dev, request);
 666         if (ret != 0)
 667                 goto cleanup;
 668
 669         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 670
 671         if (t == 0) {
 672                 netdev_err(ndev,
 673                         "timeout before we got a set response...\n");
 674                 ret = -ETIMEDOUT;
 675                 /*
 676                  * We can't deallocate the request since we may still receive a
 677                  * send completion for it.
 678                  */
 679                 goto exit;
 680         } else {
 681                 set_complete = &request->response_msg.msg.set_complete;
 682                 status = set_complete->status;
 683         }
 684
 685 cleanup:
 686         if (request)
 687                 put_rndis_request(dev, request);
 688 exit:
 689         return ret;
 690 }
 691
 692
 693 static int rndis_filter_init_device(struct rndis_device *dev)
 694 {
 695         struct rndis_request *request;
 696         struct rndis_initialize_request *init;
 697         struct rndis_initialize_complete *init_complete;
 698         u32 status;
 699         int ret, t;
 700
 701         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 702                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 703         if (!request) {
 704                 ret = -ENOMEM;
 705                 goto cleanup;
 706         }
 707
 708         /* Setup the rndis set */
 709         init = &request->request_msg.msg.init_req;
 710         init->major_ver = RNDIS_MAJOR_VERSION;
 711         init->minor_ver = RNDIS_MINOR_VERSION;
 712         init->max_xfer_size = 0x4000;
 713
 714         dev->state = RNDIS_DEV_INITIALIZING;
 715
 716         ret = rndis_filter_send_request(dev, request);
 717         if (ret != 0) {
 718                 dev->state = RNDIS_DEV_UNINITIALIZED;
 719                 goto cleanup;
 720         }
 721
 722
 723         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 724
 725         if (t == 0) {
 726                 ret = -ETIMEDOUT;
 727                 goto cleanup;
 728         }
 729
 730         init_complete = &request->response_msg.msg.init_complete;
 731         status = init_complete->status;
 732         if (status == RNDIS_STATUS_SUCCESS) {
 733                 dev->state = RNDIS_DEV_INITIALIZED;
 734                 ret = 0;
 735         } else {
 736                 dev->state = RNDIS_DEV_UNINITIALIZED;
 737                 ret = -EINVAL;
 738         }
 739
 740 cleanup:
 741         if (request)
 742                 put_rndis_request(dev, request);
 743
 744         return ret;
 745 }
 746
 747 static void rndis_filter_halt_device(struct rndis_device *dev)
 748 {
 749         struct rndis_request *request;
 750         struct rndis_halt_request *halt;
 751         struct netvsc_device *nvdev = dev->net_dev;
 752         struct hv_device *hdev = nvdev->dev;
 753         ulong flags;
 754
 755         /* Attempt to do a rndis device halt */
 756         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 757                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 758         if (!request)
 759                 goto cleanup;
 760
 761         /* Setup the rndis set */
 762         halt = &request->request_msg.msg.halt_req;
 763         halt->req_id = atomic_inc_return(&dev->new_req_id);
 764
 765         /* Ignore return since this msg is optional. */
 766         rndis_filter_send_request(dev, request);
 767
 768         dev->state = RNDIS_DEV_UNINITIALIZED;
 769
 770 cleanup:
 771         spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
 772         nvdev->destroy = true;
 773         spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
 774
 775         /* Wait for all send completions */
 776         wait_event(nvdev->wait_drain,
 777                 atomic_read(&nvdev->num_outstanding_sends) == 0);
 778
 779         if (request)
 780                 put_rndis_request(dev, request);
 781         return;
 782 }
 783
 784 static int rndis_filter_open_device(struct rndis_device *dev)
 785 {
 786         int ret;
 787
 788         if (dev->state != RNDIS_DEV_INITIALIZED)
 789                 return 0;
 790
 791         ret = rndis_filter_set_packet_filter(dev,
 792                                          NDIS_PACKET_TYPE_BROADCAST |
 793                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 794                                          NDIS_PACKET_TYPE_DIRECTED);
 795         if (ret == 0)
 796                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 797
 798         return ret;
 799 }
 800
 801 static int rndis_filter_close_device(struct rndis_device *dev)
 802 {
 803         int ret;
 804
 805         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 806                 return 0;
 807
 808         ret = rndis_filter_set_packet_filter(dev, 0);
 809         if (ret == 0)
 810                 dev->state = RNDIS_DEV_INITIALIZED;
 811
 812         return ret;
 813 }
 814
 815 int rndis_filter_device_add(struct hv_device *dev,
 816                                   void *additional_info)
 817 {
 818         int ret;
 819         struct netvsc_device *net_device;
 820         struct rndis_device *rndis_device;
 821         struct netvsc_device_info *device_info = additional_info;
 822
 823         rndis_device = get_rndis_device();
 824         if (!rndis_device)
 825                 return -ENODEV;
 826
 827         /*
 828          * Let the inner driver handle this first to create the netvsc channel
 829          * NOTE! Once the channel is created, we may get a receive callback
 830          * (RndisFilterOnReceive()) before this call is completed
 831          */
 832         ret = netvsc_device_add(dev, additional_info);
 833         if (ret != 0) {
 834                 kfree(rndis_device);
 835                 return ret;
 836         }
 837
 838
 839         /* Initialize the rndis device */
 840         net_device = hv_get_drvdata(dev);
 841
 842         net_device->extension = rndis_device;
 843         rndis_device->net_dev = net_device;
 844
 845         /* Send the rndis initialization message */
 846         ret = rndis_filter_init_device(rndis_device);
 847         if (ret != 0) {
 848                 rndis_filter_device_remove(dev);
 849                 return ret;
 850         }
 851
 852         /* Get the mac address */
 853         ret = rndis_filter_query_device_mac(rndis_device);
 854         if (ret != 0) {
 855                 rndis_filter_device_remove(dev);
 856                 return ret;
 857         }
 858
 859         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 860
 861         rndis_filter_query_device_link_status(rndis_device);
 862
 863         device_info->link_state = rndis_device->link_state;
 864
 865         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 866                  rndis_device->hw_mac_adr,
 867                  device_info->link_state ? "down" : "up");
 868
 869         return ret;
 870 }
 871
 872 void rndis_filter_device_remove(struct hv_device *dev)
 873 {
 874         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 875         struct rndis_device *rndis_dev = net_dev->extension;
 876
 877         /* Halt and release the rndis device */
 878         rndis_filter_halt_device(rndis_dev);
 879
 880         kfree(rndis_dev);
 881         net_dev->extension = NULL;
 882
 883         netvsc_device_remove(dev);
 884 }
 885
 886
 887 int rndis_filter_open(struct hv_device *dev)
 888 {
 889         struct netvsc_device *net_device = hv_get_drvdata(dev);
 890
 891         if (!net_device)
 892                 return -EINVAL;
 893
 894         return rndis_filter_open_device(net_device->extension);
 895 }
 896
 897 int rndis_filter_close(struct hv_device *dev)
 898 {
 899         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 900
 901         if (!nvdev)
 902                 return -EINVAL;
 903
 904         return rndis_filter_close_device(nvdev->extension);
 905 }
 906
 907 int rndis_filter_send(struct hv_device *dev,
 908                              struct hv_netvsc_packet *pkt)
 909 {
 910         int ret;
 911         struct rndis_filter_packet *filter_pkt;
 912         struct rndis_message *rndis_msg;
 913         struct rndis_packet *rndis_pkt;
 914         u32 rndis_msg_size;
 915         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 916
 917         /* Add the rndis header */
 918         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 919
 920         rndis_msg = &filter_pkt->msg;
 921         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 922         if (isvlan)
 923                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 924
 925         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 926         rndis_msg->msg_len = pkt->total_data_buflen +
 927                                       rndis_msg_size;
 928
 929         rndis_pkt = &rndis_msg->msg.pkt;
 930         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 931         if (isvlan)
 932                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 933         rndis_pkt->data_len = pkt->total_data_buflen;
 934
 935         if (isvlan) {
 936                 struct rndis_per_packet_info *ppi;
 937                 struct ndis_pkt_8021q_info *vlan;
 938
 939                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 940                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 941
 942                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 943                         rndis_pkt->per_pkt_info_offset);
 944                 ppi->size = NDIS_VLAN_PPI_SIZE;
 945                 ppi->type = IEEE_8021Q_INFO;
 946                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 947
 948                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 949                         ppi->ppi_offset);
 950                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 951                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 952         }
 953
 954         pkt->is_data_pkt = true;
 955         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 956         pkt->page_buf[0].offset =
 957                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 958         pkt->page_buf[0].len = rndis_msg_size;
 959
 960         /* Add one page_buf if the rndis msg goes beyond page boundary */
 961         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 962                 int i;
 963                 for (i = pkt->page_buf_cnt; i > 1; i--)
 964                         pkt->page_buf[i] = pkt->page_buf[i-1];
 965                 pkt->page_buf_cnt++;
 966                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 967                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 968                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 969                 pkt->page_buf[1].offset = 0;
 970                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 971         }
 972
 973         /* Save the packet send completion and context */
 974         filter_pkt->completion = pkt->completion.send.send_completion;
 975         filter_pkt->completion_ctx =
 976                                 pkt->completion.send.send_completion_ctx;
 977
 978         /* Use ours */
 979         pkt->completion.send.send_completion = rndis_filter_send_completion;
 980         pkt->completion.send.send_completion_ctx = filter_pkt;
 981
 982         ret = netvsc_send(dev, pkt);
 983         if (ret != 0) {
 984                 /*
 985                  * Reset the completion to originals to allow retries from
 986                  * above
 987                  */
 988                 pkt->completion.send.send_completion =
 989                                 filter_pkt->completion;
 990                 pkt->completion.send.send_completion_ctx =
 991                                 filter_pkt->completion_ctx;
 992         }
 993
 994         return ret;
 995 }
 996
 997 static void rndis_filter_send_completion(void *ctx)
 998 {
 999         struct rndis_filter_packet *filter_pkt = ctx;
1000
1001         /* Pass it back to the original handler */
1002         filter_pkt->completion(filter_pkt->completion_ctx);
1003 }
1004
1005
1006 static void rndis_filter_send_request_completion(void *ctx)
1007 {
1008         /* Noop */
1009 }