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         /* Remove the rndis header and pass it back up the stack */
 367         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 368
 369         pkt->total_data_buflen -= data_offset;
 370
 371         /*
 372          * Make sure we got a valid RNDIS message, now total_data_buflen
 373          * should be the data packet size plus the trailer padding size
 374          */
 375         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 376                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 377                            "overflow detected (got %u, min %u)"
 378                            "...dropping this message!\n",
 379                            pkt->total_data_buflen, rndis_pkt->data_len);
 380                 return;
 381         }
 382
 383         /*
 384          * Remove the rndis trailer padding from rndis packet message
 385          * rndis_pkt->data_len tell us the real data length, we only copy
 386          * the data packet to the stack, without the rndis trailer padding
 387          */
 388         pkt->total_data_buflen = rndis_pkt->data_len;
 389         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 390
 391         pkt->is_data_pkt = true;
 392
 393         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 394         if (vlan) {
 395                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 396                         (vlan->pri << VLAN_PRIO_SHIFT);
 397         } else {
 398                 pkt->vlan_tci = 0;
 399         }
 400
 401         netvsc_recv_callback(dev->net_dev->dev, pkt);
 402 }
 403
 404 int rndis_filter_receive(struct hv_device *dev,
 405                                 struct hv_netvsc_packet *pkt)
 406 {
 407         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 408         struct rndis_device *rndis_dev;
 409         struct rndis_message *rndis_msg;
 410         struct net_device *ndev;
 411         int ret = 0;
 412
 413         if (!net_dev) {
 414                 ret = -EINVAL;
 415                 goto exit;
 416         }
 417
 418         ndev = net_dev->ndev;
 419
 420         /* Make sure the rndis device state is initialized */
 421         if (!net_dev->extension) {
 422                 netdev_err(ndev, "got rndis message but no rndis device - "
 423                           "dropping this message!\n");
 424                 ret = -ENODEV;
 425                 goto exit;
 426         }
 427
 428         rndis_dev = (struct rndis_device *)net_dev->extension;
 429         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 430                 netdev_err(ndev, "got rndis message but rndis device "
 431                            "uninitialized...dropping this message!\n");
 432                 ret = -ENODEV;
 433                 goto exit;
 434         }
 435
 436         rndis_msg = pkt->data;
 437
 438         dump_rndis_message(dev, rndis_msg);
 439
 440         switch (rndis_msg->ndis_msg_type) {
 441         case RNDIS_MSG_PACKET:
 442                 /* data msg */
 443                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 444                 break;
 445
 446         case RNDIS_MSG_INIT_C:
 447         case RNDIS_MSG_QUERY_C:
 448         case RNDIS_MSG_SET_C:
 449                 /* completion msgs */
 450                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 451                 break;
 452
 453         case RNDIS_MSG_INDICATE:
 454                 /* notification msgs */
 455                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 456                 break;
 457         default:
 458                 netdev_err(ndev,
 459                         "unhandled rndis message (type %u len %u)\n",
 460                            rndis_msg->ndis_msg_type,
 461                            rndis_msg->msg_len);
 462                 break;
 463         }
 464
 465 exit:
 466         if (ret != 0)
 467                 pkt->status = NVSP_STAT_FAIL;
 468
 469         return ret;
 470 }
 471
 472 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 473                                   void *result, u32 *result_size)
 474 {
 475         struct rndis_request *request;
 476         u32 inresult_size = *result_size;
 477         struct rndis_query_request *query;
 478         struct rndis_query_complete *query_complete;
 479         int ret = 0;
 480         int t;
 481
 482         if (!result)
 483                 return -EINVAL;
 484
 485         *result_size = 0;
 486         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 487                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 488         if (!request) {
 489                 ret = -ENOMEM;
 490                 goto cleanup;
 491         }
 492
 493         /* Setup the rndis query */
 494         query = &request->request_msg.msg.query_req;
 495         query->oid = oid;
 496         query->info_buf_offset = sizeof(struct rndis_query_request);
 497         query->info_buflen = 0;
 498         query->dev_vc_handle = 0;
 499
 500         ret = rndis_filter_send_request(dev, request);
 501         if (ret != 0)
 502                 goto cleanup;
 503
 504         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 505         if (t == 0) {
 506                 ret = -ETIMEDOUT;
 507                 goto cleanup;
 508         }
 509
 510         /* Copy the response back */
 511         query_complete = &request->response_msg.msg.query_complete;
 512
 513         if (query_complete->info_buflen > inresult_size) {
 514                 ret = -1;
 515                 goto cleanup;
 516         }
 517
 518         memcpy(result,
 519                (void *)((unsigned long)query_complete +
 520                          query_complete->info_buf_offset),
 521                query_complete->info_buflen);
 522
 523         *result_size = query_complete->info_buflen;
 524
 525 cleanup:
 526         if (request)
 527                 put_rndis_request(dev, request);
 528
 529         return ret;
 530 }
 531
 532 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 533 {
 534         u32 size = ETH_ALEN;
 535
 536         return rndis_filter_query_device(dev,
 537                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 538                                       dev->hw_mac_adr, &size);
 539 }
 540
 541 #define NWADR_STR "NetworkAddress"
 542 #define NWADR_STRLEN 14
 543
 544 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 545 {
 546         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 547         struct rndis_device *rdev = nvdev->extension;
 548         struct net_device *ndev = nvdev->ndev;
 549         struct rndis_request *request;
 550         struct rndis_set_request *set;
 551         struct rndis_config_parameter_info *cpi;
 552         wchar_t *cfg_nwadr, *cfg_mac;
 553         struct rndis_set_complete *set_complete;
 554         char macstr[2*ETH_ALEN+1];
 555         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 556                 2*NWADR_STRLEN + 4*ETH_ALEN;
 557         int ret, t;
 558
 559         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 560                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 561         if (!request)
 562                 return -ENOMEM;
 563
 564         set = &request->request_msg.msg.set_req;
 565         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 566         set->info_buflen = extlen;
 567         set->info_buf_offset = sizeof(struct rndis_set_request);
 568         set->dev_vc_handle = 0;
 569
 570         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 571                 set->info_buf_offset);
 572         cpi->parameter_name_offset =
 573                 sizeof(struct rndis_config_parameter_info);
 574         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 575         cpi->parameter_name_length = 2*NWADR_STRLEN;
 576         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 577         cpi->parameter_value_offset =
 578                 cpi->parameter_name_offset + cpi->parameter_name_length;
 579         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 580         cpi->parameter_value_length = 4*ETH_ALEN;
 581
 582         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 583         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 584         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 585                               cfg_nwadr, NWADR_STRLEN);
 586         if (ret < 0)
 587                 goto cleanup;
 588         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 589         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 590                               cfg_mac, 2*ETH_ALEN);
 591         if (ret < 0)
 592                 goto cleanup;
 593
 594         ret = rndis_filter_send_request(rdev, request);
 595         if (ret != 0)
 596                 goto cleanup;
 597
 598         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 599         if (t == 0) {
 600                 netdev_err(ndev, "timeout before we got a set response...\n");
 601                 /*
 602                  * can't put_rndis_request, since we may still receive a
 603                  * send-completion.
 604                  */
 605                 return -EBUSY;
 606         } else {
 607                 set_complete = &request->response_msg.msg.set_complete;
 608                 if (set_complete->status != RNDIS_STATUS_SUCCESS)
 609                         ret = -EINVAL;
 610         }
 611
 612 cleanup:
 613         put_rndis_request(rdev, request);
 614         return ret;
 615 }
 616
 617
 618 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 619 {
 620         u32 size = sizeof(u32);
 621         u32 link_status;
 622         int ret;
 623
 624         ret = rndis_filter_query_device(dev,
 625                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 626                                       &link_status, &size);
 627         dev->link_state = (link_status != 0) ? true : false;
 628
 629         return ret;
 630 }
 631
 632 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 633 {
 634         struct rndis_request *request;
 635         struct rndis_set_request *set;
 636         struct rndis_set_complete *set_complete;
 637         u32 status;
 638         int ret, t;
 639         struct net_device *ndev;
 640
 641         ndev = dev->net_dev->ndev;
 642
 643         request = get_rndis_request(dev, RNDIS_MSG_SET,
 644                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 645                         sizeof(u32));
 646         if (!request) {
 647                 ret = -ENOMEM;
 648                 goto cleanup;
 649         }
 650
 651         /* Setup the rndis set */
 652         set = &request->request_msg.msg.set_req;
 653         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 654         set->info_buflen = sizeof(u32);
 655         set->info_buf_offset = sizeof(struct rndis_set_request);
 656
 657         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 658                &new_filter, sizeof(u32));
 659
 660         ret = rndis_filter_send_request(dev, request);
 661         if (ret != 0)
 662                 goto cleanup;
 663
 664         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 665
 666         if (t == 0) {
 667                 netdev_err(ndev,
 668                         "timeout before we got a set response...\n");
 669                 ret = -ETIMEDOUT;
 670                 /*
 671                  * We can't deallocate the request since we may still receive a
 672                  * send completion for it.
 673                  */
 674                 goto exit;
 675         } else {
 676                 set_complete = &request->response_msg.msg.set_complete;
 677                 status = set_complete->status;
 678         }
 679
 680 cleanup:
 681         if (request)
 682                 put_rndis_request(dev, request);
 683 exit:
 684         return ret;
 685 }
 686
 687
 688 static int rndis_filter_init_device(struct rndis_device *dev)
 689 {
 690         struct rndis_request *request;
 691         struct rndis_initialize_request *init;
 692         struct rndis_initialize_complete *init_complete;
 693         u32 status;
 694         int ret, t;
 695
 696         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 697                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 698         if (!request) {
 699                 ret = -ENOMEM;
 700                 goto cleanup;
 701         }
 702
 703         /* Setup the rndis set */
 704         init = &request->request_msg.msg.init_req;
 705         init->major_ver = RNDIS_MAJOR_VERSION;
 706         init->minor_ver = RNDIS_MINOR_VERSION;
 707         init->max_xfer_size = 0x4000;
 708
 709         dev->state = RNDIS_DEV_INITIALIZING;
 710
 711         ret = rndis_filter_send_request(dev, request);
 712         if (ret != 0) {
 713                 dev->state = RNDIS_DEV_UNINITIALIZED;
 714                 goto cleanup;
 715         }
 716
 717
 718         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 719
 720         if (t == 0) {
 721                 ret = -ETIMEDOUT;
 722                 goto cleanup;
 723         }
 724
 725         init_complete = &request->response_msg.msg.init_complete;
 726         status = init_complete->status;
 727         if (status == RNDIS_STATUS_SUCCESS) {
 728                 dev->state = RNDIS_DEV_INITIALIZED;
 729                 ret = 0;
 730         } else {
 731                 dev->state = RNDIS_DEV_UNINITIALIZED;
 732                 ret = -EINVAL;
 733         }
 734
 735 cleanup:
 736         if (request)
 737                 put_rndis_request(dev, request);
 738
 739         return ret;
 740 }
 741
 742 static void rndis_filter_halt_device(struct rndis_device *dev)
 743 {
 744         struct rndis_request *request;
 745         struct rndis_halt_request *halt;
 746         struct netvsc_device *nvdev = dev->net_dev;
 747         struct hv_device *hdev = nvdev->dev;
 748         ulong flags;
 749
 750         /* Attempt to do a rndis device halt */
 751         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 752                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 753         if (!request)
 754                 goto cleanup;
 755
 756         /* Setup the rndis set */
 757         halt = &request->request_msg.msg.halt_req;
 758         halt->req_id = atomic_inc_return(&dev->new_req_id);
 759
 760         /* Ignore return since this msg is optional. */
 761         rndis_filter_send_request(dev, request);
 762
 763         dev->state = RNDIS_DEV_UNINITIALIZED;
 764
 765 cleanup:
 766         spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
 767         nvdev->destroy = true;
 768         spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
 769
 770         /* Wait for all send completions */
 771         wait_event(nvdev->wait_drain,
 772                 atomic_read(&nvdev->num_outstanding_sends) == 0);
 773
 774         if (request)
 775                 put_rndis_request(dev, request);
 776         return;
 777 }
 778
 779 static int rndis_filter_open_device(struct rndis_device *dev)
 780 {
 781         int ret;
 782
 783         if (dev->state != RNDIS_DEV_INITIALIZED)
 784                 return 0;
 785
 786         ret = rndis_filter_set_packet_filter(dev,
 787                                          NDIS_PACKET_TYPE_BROADCAST |
 788                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 789                                          NDIS_PACKET_TYPE_DIRECTED);
 790         if (ret == 0)
 791                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 792
 793         return ret;
 794 }
 795
 796 static int rndis_filter_close_device(struct rndis_device *dev)
 797 {
 798         int ret;
 799
 800         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 801                 return 0;
 802
 803         ret = rndis_filter_set_packet_filter(dev, 0);
 804         if (ret == 0)
 805                 dev->state = RNDIS_DEV_INITIALIZED;
 806
 807         return ret;
 808 }
 809
 810 int rndis_filter_device_add(struct hv_device *dev,
 811                                   void *additional_info)
 812 {
 813         int ret;
 814         struct netvsc_device *net_device;
 815         struct rndis_device *rndis_device;
 816         struct netvsc_device_info *device_info = additional_info;
 817
 818         rndis_device = get_rndis_device();
 819         if (!rndis_device)
 820                 return -ENODEV;
 821
 822         /*
 823          * Let the inner driver handle this first to create the netvsc channel
 824          * NOTE! Once the channel is created, we may get a receive callback
 825          * (RndisFilterOnReceive()) before this call is completed
 826          */
 827         ret = netvsc_device_add(dev, additional_info);
 828         if (ret != 0) {
 829                 kfree(rndis_device);
 830                 return ret;
 831         }
 832
 833
 834         /* Initialize the rndis device */
 835         net_device = hv_get_drvdata(dev);
 836
 837         net_device->extension = rndis_device;
 838         rndis_device->net_dev = net_device;
 839
 840         /* Send the rndis initialization message */
 841         ret = rndis_filter_init_device(rndis_device);
 842         if (ret != 0) {
 843                 rndis_filter_device_remove(dev);
 844                 return ret;
 845         }
 846
 847         /* Get the mac address */
 848         ret = rndis_filter_query_device_mac(rndis_device);
 849         if (ret != 0) {
 850                 rndis_filter_device_remove(dev);
 851                 return ret;
 852         }
 853
 854         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 855
 856         rndis_filter_query_device_link_status(rndis_device);
 857
 858         device_info->link_state = rndis_device->link_state;
 859
 860         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 861                  rndis_device->hw_mac_adr,
 862                  device_info->link_state ? "down" : "up");
 863
 864         return ret;
 865 }
 866
 867 void rndis_filter_device_remove(struct hv_device *dev)
 868 {
 869         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 870         struct rndis_device *rndis_dev = net_dev->extension;
 871
 872         /* Halt and release the rndis device */
 873         rndis_filter_halt_device(rndis_dev);
 874
 875         kfree(rndis_dev);
 876         net_dev->extension = NULL;
 877
 878         netvsc_device_remove(dev);
 879 }
 880
 881
 882 int rndis_filter_open(struct hv_device *dev)
 883 {
 884         struct netvsc_device *net_device = hv_get_drvdata(dev);
 885
 886         if (!net_device)
 887                 return -EINVAL;
 888
 889         return rndis_filter_open_device(net_device->extension);
 890 }
 891
 892 int rndis_filter_close(struct hv_device *dev)
 893 {
 894         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 895
 896         if (!nvdev)
 897                 return -EINVAL;
 898
 899         return rndis_filter_close_device(nvdev->extension);
 900 }
 901
 902 int rndis_filter_send(struct hv_device *dev,
 903                              struct hv_netvsc_packet *pkt)
 904 {
 905         int ret;
 906         struct rndis_filter_packet *filter_pkt;
 907         struct rndis_message *rndis_msg;
 908         struct rndis_packet *rndis_pkt;
 909         u32 rndis_msg_size;
 910         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 911
 912         /* Add the rndis header */
 913         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 914
 915         rndis_msg = &filter_pkt->msg;
 916         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 917         if (isvlan)
 918                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 919
 920         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 921         rndis_msg->msg_len = pkt->total_data_buflen +
 922                                       rndis_msg_size;
 923
 924         rndis_pkt = &rndis_msg->msg.pkt;
 925         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 926         if (isvlan)
 927                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 928         rndis_pkt->data_len = pkt->total_data_buflen;
 929
 930         if (isvlan) {
 931                 struct rndis_per_packet_info *ppi;
 932                 struct ndis_pkt_8021q_info *vlan;
 933
 934                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 935                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 936
 937                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 938                         rndis_pkt->per_pkt_info_offset);
 939                 ppi->size = NDIS_VLAN_PPI_SIZE;
 940                 ppi->type = IEEE_8021Q_INFO;
 941                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 942
 943                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 944                         ppi->ppi_offset);
 945                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 946                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 947         }
 948
 949         pkt->is_data_pkt = true;
 950         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 951         pkt->page_buf[0].offset =
 952                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 953         pkt->page_buf[0].len = rndis_msg_size;
 954
 955         /* Add one page_buf if the rndis msg goes beyond page boundary */
 956         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 957                 int i;
 958                 for (i = pkt->page_buf_cnt; i > 1; i--)
 959                         pkt->page_buf[i] = pkt->page_buf[i-1];
 960                 pkt->page_buf_cnt++;
 961                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 962                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 963                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 964                 pkt->page_buf[1].offset = 0;
 965                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 966         }
 967
 968         /* Save the packet send completion and context */
 969         filter_pkt->completion = pkt->completion.send.send_completion;
 970         filter_pkt->completion_ctx =
 971                                 pkt->completion.send.send_completion_ctx;
 972
 973         /* Use ours */
 974         pkt->completion.send.send_completion = rndis_filter_send_completion;
 975         pkt->completion.send.send_completion_ctx = filter_pkt;
 976
 977         ret = netvsc_send(dev, pkt);
 978         if (ret != 0) {
 979                 /*
 980                  * Reset the completion to originals to allow retries from
 981                  * above
 982                  */
 983                 pkt->completion.send.send_completion =
 984                                 filter_pkt->completion;
 985                 pkt->completion.send.send_completion_ctx =
 986                                 filter_pkt->completion_ctx;
 987         }
 988
 989         return ret;
 990 }
 991
 992 static void rndis_filter_send_completion(void *ctx)
 993 {
 994         struct rndis_filter_packet *filter_pkt = ctx;
 995
 996         /* Pass it back to the original handler */
 997         filter_pkt->completion(filter_pkt->completion_ctx);
 998 }
 999
1000
1001 static void rndis_filter_send_request_completion(void *ctx)
1002 {
1003         /* Noop */
1004 }