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_set_link_state(struct rndis_device *rdev,
 247                                  struct rndis_request *request)
 248 {
 249         u32 link_status;
 250         struct rndis_query_complete *query_complete;
 251
 252         query_complete = &request->response_msg.msg.query_complete;
 253
 254         if (query_complete->status == RNDIS_STATUS_SUCCESS &&
 255             query_complete->info_buflen == sizeof(u32)) {
 256                 memcpy(&link_status, (void *)((unsigned long)query_complete +
 257                        query_complete->info_buf_offset), sizeof(u32));
 258                 rdev->link_state = link_status != 0;
 259         }
 260 }
 261
 262 static void rndis_filter_receive_response(struct rndis_device *dev,
 263                                        struct rndis_message *resp)
 264 {
 265         struct rndis_request *request = NULL;
 266         bool found = false;
 267         unsigned long flags;
 268         struct net_device *ndev;
 269
 270         ndev = dev->net_dev->ndev;
 271
 272         spin_lock_irqsave(&dev->request_lock, flags);
 273         list_for_each_entry(request, &dev->req_list, list_ent) {
 274                 /*
 275                  * All request/response message contains RequestId as the 1st
 276                  * field
 277                  */
 278                 if (request->request_msg.msg.init_req.req_id
 279                     == resp->msg.init_complete.req_id) {
 280                         found = true;
 281                         break;
 282                 }
 283         }
 284         spin_unlock_irqrestore(&dev->request_lock, flags);
 285
 286         if (found) {
 287                 if (resp->msg_len <=
 288                     sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
 289                         memcpy(&request->response_msg, resp,
 290                                resp->msg_len);
 291                         if (request->request_msg.ndis_msg_type ==
 292                             RNDIS_MSG_QUERY && request->request_msg.msg.
 293                             query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
 294                                 rndis_set_link_state(dev, request);
 295                 } else {
 296                         netdev_err(ndev,
 297                                 "rndis response buffer overflow "
 298                                 "detected (size %u max %zu)\n",
 299                                 resp->msg_len,
 300                                 sizeof(struct rndis_filter_packet));
 301
 302                         if (resp->ndis_msg_type ==
 303                             RNDIS_MSG_RESET_C) {
 304                                 /* does not have a request id field */
 305                                 request->response_msg.msg.reset_complete.
 306                                         status = RNDIS_STATUS_BUFFER_OVERFLOW;
 307                         } else {
 308                                 request->response_msg.msg.
 309                                 init_complete.status =
 310                                         RNDIS_STATUS_BUFFER_OVERFLOW;
 311                         }
 312                 }
 313
 314                 complete(&request->wait_event);
 315         } else {
 316                 netdev_err(ndev,
 317                         "no rndis request found for this response "
 318                         "(id 0x%x res type 0x%x)\n",
 319                         resp->msg.init_complete.req_id,
 320                         resp->ndis_msg_type);
 321         }
 322 }
 323
 324 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
 325                                              struct rndis_message *resp)
 326 {
 327         struct rndis_indicate_status *indicate =
 328                         &resp->msg.indicate_status;
 329
 330         if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
 331                 netvsc_linkstatus_callback(
 332                         dev->net_dev->dev, 1);
 333         } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
 334                 netvsc_linkstatus_callback(
 335                         dev->net_dev->dev, 0);
 336         } else {
 337                 /*
 338                  * TODO:
 339                  */
 340         }
 341 }
 342
 343 /*
 344  * Get the Per-Packet-Info with the specified type
 345  * return NULL if not found.
 346  */
 347 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 348 {
 349         struct rndis_per_packet_info *ppi;
 350         int len;
 351
 352         if (rpkt->per_pkt_info_offset == 0)
 353                 return NULL;
 354
 355         ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
 356                 rpkt->per_pkt_info_offset);
 357         len = rpkt->per_pkt_info_len;
 358
 359         while (len > 0) {
 360                 if (ppi->type == type)
 361                         return (void *)((ulong)ppi + ppi->ppi_offset);
 362                 len -= ppi->size;
 363                 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
 364         }
 365
 366         return NULL;
 367 }
 368
 369 static void rndis_filter_receive_data(struct rndis_device *dev,
 370                                    struct rndis_message *msg,
 371                                    struct hv_netvsc_packet *pkt)
 372 {
 373         struct rndis_packet *rndis_pkt;
 374         u32 data_offset;
 375         struct ndis_pkt_8021q_info *vlan;
 376
 377         rndis_pkt = &msg->msg.pkt;
 378
 379         /* Remove the rndis header and pass it back up the stack */
 380         data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
 381
 382         pkt->total_data_buflen -= data_offset;
 383
 384         /*
 385          * Make sure we got a valid RNDIS message, now total_data_buflen
 386          * should be the data packet size plus the trailer padding size
 387          */
 388         if (pkt->total_data_buflen < rndis_pkt->data_len) {
 389                 netdev_err(dev->net_dev->ndev, "rndis message buffer "
 390                            "overflow detected (got %u, min %u)"
 391                            "...dropping this message!\n",
 392                            pkt->total_data_buflen, rndis_pkt->data_len);
 393                 return;
 394         }
 395
 396         /*
 397          * Remove the rndis trailer padding from rndis packet message
 398          * rndis_pkt->data_len tell us the real data length, we only copy
 399          * the data packet to the stack, without the rndis trailer padding
 400          */
 401         pkt->total_data_buflen = rndis_pkt->data_len;
 402         pkt->data = (void *)((unsigned long)pkt->data + data_offset);
 403
 404         pkt->is_data_pkt = true;
 405
 406         vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 407         if (vlan) {
 408                 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
 409                         (vlan->pri << VLAN_PRIO_SHIFT);
 410         } else {
 411                 pkt->vlan_tci = 0;
 412         }
 413
 414         netvsc_recv_callback(dev->net_dev->dev, pkt);
 415 }
 416
 417 int rndis_filter_receive(struct hv_device *dev,
 418                                 struct hv_netvsc_packet *pkt)
 419 {
 420         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 421         struct rndis_device *rndis_dev;
 422         struct rndis_message *rndis_msg;
 423         struct net_device *ndev;
 424         int ret = 0;
 425
 426         if (!net_dev) {
 427                 ret = -EINVAL;
 428                 goto exit;
 429         }
 430
 431         ndev = net_dev->ndev;
 432
 433         /* Make sure the rndis device state is initialized */
 434         if (!net_dev->extension) {
 435                 netdev_err(ndev, "got rndis message but no rndis device - "
 436                           "dropping this message!\n");
 437                 ret = -ENODEV;
 438                 goto exit;
 439         }
 440
 441         rndis_dev = (struct rndis_device *)net_dev->extension;
 442         if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
 443                 netdev_err(ndev, "got rndis message but rndis device "
 444                            "uninitialized...dropping this message!\n");
 445                 ret = -ENODEV;
 446                 goto exit;
 447         }
 448
 449         rndis_msg = pkt->data;
 450
 451         dump_rndis_message(dev, rndis_msg);
 452
 453         switch (rndis_msg->ndis_msg_type) {
 454         case RNDIS_MSG_PACKET:
 455                 /* data msg */
 456                 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
 457                 break;
 458
 459         case RNDIS_MSG_INIT_C:
 460         case RNDIS_MSG_QUERY_C:
 461         case RNDIS_MSG_SET_C:
 462                 /* completion msgs */
 463                 rndis_filter_receive_response(rndis_dev, rndis_msg);
 464                 break;
 465
 466         case RNDIS_MSG_INDICATE:
 467                 /* notification msgs */
 468                 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
 469                 break;
 470         default:
 471                 netdev_err(ndev,
 472                         "unhandled rndis message (type %u len %u)\n",
 473                            rndis_msg->ndis_msg_type,
 474                            rndis_msg->msg_len);
 475                 break;
 476         }
 477
 478 exit:
 479         if (ret != 0)
 480                 pkt->status = NVSP_STAT_FAIL;
 481
 482         return ret;
 483 }
 484
 485 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
 486                                   void *result, u32 *result_size)
 487 {
 488         struct rndis_request *request;
 489         u32 inresult_size = *result_size;
 490         struct rndis_query_request *query;
 491         struct rndis_query_complete *query_complete;
 492         int ret = 0;
 493         int t;
 494
 495         if (!result)
 496                 return -EINVAL;
 497
 498         *result_size = 0;
 499         request = get_rndis_request(dev, RNDIS_MSG_QUERY,
 500                         RNDIS_MESSAGE_SIZE(struct rndis_query_request));
 501         if (!request) {
 502                 ret = -ENOMEM;
 503                 goto cleanup;
 504         }
 505
 506         /* Setup the rndis query */
 507         query = &request->request_msg.msg.query_req;
 508         query->oid = oid;
 509         query->info_buf_offset = sizeof(struct rndis_query_request);
 510         query->info_buflen = 0;
 511         query->dev_vc_handle = 0;
 512
 513         ret = rndis_filter_send_request(dev, request);
 514         if (ret != 0)
 515                 goto cleanup;
 516
 517         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 518         if (t == 0) {
 519                 ret = -ETIMEDOUT;
 520                 goto cleanup;
 521         }
 522
 523         /* Copy the response back */
 524         query_complete = &request->response_msg.msg.query_complete;
 525
 526         if (query_complete->info_buflen > inresult_size) {
 527                 ret = -1;
 528                 goto cleanup;
 529         }
 530
 531         memcpy(result,
 532                (void *)((unsigned long)query_complete +
 533                          query_complete->info_buf_offset),
 534                query_complete->info_buflen);
 535
 536         *result_size = query_complete->info_buflen;
 537
 538 cleanup:
 539         if (request)
 540                 put_rndis_request(dev, request);
 541
 542         return ret;
 543 }
 544
 545 static int rndis_filter_query_device_mac(struct rndis_device *dev)
 546 {
 547         u32 size = ETH_ALEN;
 548
 549         return rndis_filter_query_device(dev,
 550                                       RNDIS_OID_802_3_PERMANENT_ADDRESS,
 551                                       dev->hw_mac_adr, &size);
 552 }
 553
 554 #define NWADR_STR "NetworkAddress"
 555 #define NWADR_STRLEN 14
 556
 557 int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 558 {
 559         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 560         struct rndis_device *rdev = nvdev->extension;
 561         struct net_device *ndev = nvdev->ndev;
 562         struct rndis_request *request;
 563         struct rndis_set_request *set;
 564         struct rndis_config_parameter_info *cpi;
 565         wchar_t *cfg_nwadr, *cfg_mac;
 566         struct rndis_set_complete *set_complete;
 567         char macstr[2*ETH_ALEN+1];
 568         u32 extlen = sizeof(struct rndis_config_parameter_info) +
 569                 2*NWADR_STRLEN + 4*ETH_ALEN;
 570         int ret, t;
 571
 572         request = get_rndis_request(rdev, RNDIS_MSG_SET,
 573                 RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
 574         if (!request)
 575                 return -ENOMEM;
 576
 577         set = &request->request_msg.msg.set_req;
 578         set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
 579         set->info_buflen = extlen;
 580         set->info_buf_offset = sizeof(struct rndis_set_request);
 581         set->dev_vc_handle = 0;
 582
 583         cpi = (struct rndis_config_parameter_info *)((ulong)set +
 584                 set->info_buf_offset);
 585         cpi->parameter_name_offset =
 586                 sizeof(struct rndis_config_parameter_info);
 587         /* Multiply by 2 because host needs 2 bytes (utf16) for each char */
 588         cpi->parameter_name_length = 2*NWADR_STRLEN;
 589         cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
 590         cpi->parameter_value_offset =
 591                 cpi->parameter_name_offset + cpi->parameter_name_length;
 592         /* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
 593         cpi->parameter_value_length = 4*ETH_ALEN;
 594
 595         cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
 596         cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
 597         ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
 598                               cfg_nwadr, NWADR_STRLEN);
 599         if (ret < 0)
 600                 goto cleanup;
 601         snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
 602         ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
 603                               cfg_mac, 2*ETH_ALEN);
 604         if (ret < 0)
 605                 goto cleanup;
 606
 607         ret = rndis_filter_send_request(rdev, request);
 608         if (ret != 0)
 609                 goto cleanup;
 610
 611         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 612         if (t == 0) {
 613                 netdev_err(ndev, "timeout before we got a set response...\n");
 614                 /*
 615                  * can't put_rndis_request, since we may still receive a
 616                  * send-completion.
 617                  */
 618                 return -EBUSY;
 619         } else {
 620                 set_complete = &request->response_msg.msg.set_complete;
 621                 if (set_complete->status != RNDIS_STATUS_SUCCESS) {
 622                         netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
 623                                    set_complete->status);
 624                         ret = -EINVAL;
 625                 }
 626         }
 627
 628 cleanup:
 629         put_rndis_request(rdev, request);
 630         return ret;
 631 }
 632
 633
 634 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
 635 {
 636         u32 size = sizeof(u32);
 637         u32 link_status;
 638         int ret;
 639
 640         ret = rndis_filter_query_device(dev,
 641                                       RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
 642                                       &link_status, &size);
 643
 644         return ret;
 645 }
 646
 647 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
 648 {
 649         struct rndis_request *request;
 650         struct rndis_set_request *set;
 651         struct rndis_set_complete *set_complete;
 652         u32 status;
 653         int ret, t;
 654         struct net_device *ndev;
 655
 656         ndev = dev->net_dev->ndev;
 657
 658         request = get_rndis_request(dev, RNDIS_MSG_SET,
 659                         RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
 660                         sizeof(u32));
 661         if (!request) {
 662                 ret = -ENOMEM;
 663                 goto cleanup;
 664         }
 665
 666         /* Setup the rndis set */
 667         set = &request->request_msg.msg.set_req;
 668         set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
 669         set->info_buflen = sizeof(u32);
 670         set->info_buf_offset = sizeof(struct rndis_set_request);
 671
 672         memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
 673                &new_filter, sizeof(u32));
 674
 675         ret = rndis_filter_send_request(dev, request);
 676         if (ret != 0)
 677                 goto cleanup;
 678
 679         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 680
 681         if (t == 0) {
 682                 netdev_err(ndev,
 683                         "timeout before we got a set response...\n");
 684                 ret = -ETIMEDOUT;
 685                 /*
 686                  * We can't deallocate the request since we may still receive a
 687                  * send completion for it.
 688                  */
 689                 goto exit;
 690         } else {
 691                 set_complete = &request->response_msg.msg.set_complete;
 692                 status = set_complete->status;
 693         }
 694
 695 cleanup:
 696         if (request)
 697                 put_rndis_request(dev, request);
 698 exit:
 699         return ret;
 700 }
 701
 702
 703 static int rndis_filter_init_device(struct rndis_device *dev)
 704 {
 705         struct rndis_request *request;
 706         struct rndis_initialize_request *init;
 707         struct rndis_initialize_complete *init_complete;
 708         u32 status;
 709         int ret, t;
 710
 711         request = get_rndis_request(dev, RNDIS_MSG_INIT,
 712                         RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
 713         if (!request) {
 714                 ret = -ENOMEM;
 715                 goto cleanup;
 716         }
 717
 718         /* Setup the rndis set */
 719         init = &request->request_msg.msg.init_req;
 720         init->major_ver = RNDIS_MAJOR_VERSION;
 721         init->minor_ver = RNDIS_MINOR_VERSION;
 722         init->max_xfer_size = 0x4000;
 723
 724         dev->state = RNDIS_DEV_INITIALIZING;
 725
 726         ret = rndis_filter_send_request(dev, request);
 727         if (ret != 0) {
 728                 dev->state = RNDIS_DEV_UNINITIALIZED;
 729                 goto cleanup;
 730         }
 731
 732
 733         t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
 734
 735         if (t == 0) {
 736                 ret = -ETIMEDOUT;
 737                 goto cleanup;
 738         }
 739
 740         init_complete = &request->response_msg.msg.init_complete;
 741         status = init_complete->status;
 742         if (status == RNDIS_STATUS_SUCCESS) {
 743                 dev->state = RNDIS_DEV_INITIALIZED;
 744                 ret = 0;
 745         } else {
 746                 dev->state = RNDIS_DEV_UNINITIALIZED;
 747                 ret = -EINVAL;
 748         }
 749
 750 cleanup:
 751         if (request)
 752                 put_rndis_request(dev, request);
 753
 754         return ret;
 755 }
 756
 757 static void rndis_filter_halt_device(struct rndis_device *dev)
 758 {
 759         struct rndis_request *request;
 760         struct rndis_halt_request *halt;
 761         struct netvsc_device *nvdev = dev->net_dev;
 762         struct hv_device *hdev = nvdev->dev;
 763         ulong flags;
 764
 765         /* Attempt to do a rndis device halt */
 766         request = get_rndis_request(dev, RNDIS_MSG_HALT,
 767                                 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
 768         if (!request)
 769                 goto cleanup;
 770
 771         /* Setup the rndis set */
 772         halt = &request->request_msg.msg.halt_req;
 773         halt->req_id = atomic_inc_return(&dev->new_req_id);
 774
 775         /* Ignore return since this msg is optional. */
 776         rndis_filter_send_request(dev, request);
 777
 778         dev->state = RNDIS_DEV_UNINITIALIZED;
 779
 780 cleanup:
 781         spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
 782         nvdev->destroy = true;
 783         spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
 784
 785         /* Wait for all send completions */
 786         wait_event(nvdev->wait_drain,
 787                 atomic_read(&nvdev->num_outstanding_sends) == 0);
 788
 789         if (request)
 790                 put_rndis_request(dev, request);
 791         return;
 792 }
 793
 794 static int rndis_filter_open_device(struct rndis_device *dev)
 795 {
 796         int ret;
 797
 798         if (dev->state != RNDIS_DEV_INITIALIZED)
 799                 return 0;
 800
 801         ret = rndis_filter_set_packet_filter(dev,
 802                                          NDIS_PACKET_TYPE_BROADCAST |
 803                                          NDIS_PACKET_TYPE_ALL_MULTICAST |
 804                                          NDIS_PACKET_TYPE_DIRECTED);
 805         if (ret == 0)
 806                 dev->state = RNDIS_DEV_DATAINITIALIZED;
 807
 808         return ret;
 809 }
 810
 811 static int rndis_filter_close_device(struct rndis_device *dev)
 812 {
 813         int ret;
 814
 815         if (dev->state != RNDIS_DEV_DATAINITIALIZED)
 816                 return 0;
 817
 818         ret = rndis_filter_set_packet_filter(dev, 0);
 819         if (ret == 0)
 820                 dev->state = RNDIS_DEV_INITIALIZED;
 821
 822         return ret;
 823 }
 824
 825 int rndis_filter_device_add(struct hv_device *dev,
 826                                   void *additional_info)
 827 {
 828         int ret;
 829         struct netvsc_device *net_device;
 830         struct rndis_device *rndis_device;
 831         struct netvsc_device_info *device_info = additional_info;
 832
 833         rndis_device = get_rndis_device();
 834         if (!rndis_device)
 835                 return -ENODEV;
 836
 837         /*
 838          * Let the inner driver handle this first to create the netvsc channel
 839          * NOTE! Once the channel is created, we may get a receive callback
 840          * (RndisFilterOnReceive()) before this call is completed
 841          */
 842         ret = netvsc_device_add(dev, additional_info);
 843         if (ret != 0) {
 844                 kfree(rndis_device);
 845                 return ret;
 846         }
 847
 848
 849         /* Initialize the rndis device */
 850         net_device = hv_get_drvdata(dev);
 851
 852         net_device->extension = rndis_device;
 853         rndis_device->net_dev = net_device;
 854
 855         /* Send the rndis initialization message */
 856         ret = rndis_filter_init_device(rndis_device);
 857         if (ret != 0) {
 858                 rndis_filter_device_remove(dev);
 859                 return ret;
 860         }
 861
 862         /* Get the mac address */
 863         ret = rndis_filter_query_device_mac(rndis_device);
 864         if (ret != 0) {
 865                 rndis_filter_device_remove(dev);
 866                 return ret;
 867         }
 868
 869         memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 870
 871         rndis_filter_query_device_link_status(rndis_device);
 872
 873         device_info->link_state = rndis_device->link_state;
 874
 875         dev_info(&dev->device, "Device MAC %pM link state %s\n",
 876                  rndis_device->hw_mac_adr,
 877                  device_info->link_state ? "down" : "up");
 878
 879         return ret;
 880 }
 881
 882 void rndis_filter_device_remove(struct hv_device *dev)
 883 {
 884         struct netvsc_device *net_dev = hv_get_drvdata(dev);
 885         struct rndis_device *rndis_dev = net_dev->extension;
 886
 887         /* Halt and release the rndis device */
 888         rndis_filter_halt_device(rndis_dev);
 889
 890         kfree(rndis_dev);
 891         net_dev->extension = NULL;
 892
 893         netvsc_device_remove(dev);
 894 }
 895
 896
 897 int rndis_filter_open(struct hv_device *dev)
 898 {
 899         struct netvsc_device *net_device = hv_get_drvdata(dev);
 900
 901         if (!net_device)
 902                 return -EINVAL;
 903
 904         return rndis_filter_open_device(net_device->extension);
 905 }
 906
 907 int rndis_filter_close(struct hv_device *dev)
 908 {
 909         struct netvsc_device *nvdev = hv_get_drvdata(dev);
 910
 911         if (!nvdev)
 912                 return -EINVAL;
 913
 914         return rndis_filter_close_device(nvdev->extension);
 915 }
 916
 917 int rndis_filter_send(struct hv_device *dev,
 918                              struct hv_netvsc_packet *pkt)
 919 {
 920         int ret;
 921         struct rndis_filter_packet *filter_pkt;
 922         struct rndis_message *rndis_msg;
 923         struct rndis_packet *rndis_pkt;
 924         u32 rndis_msg_size;
 925         bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
 926
 927         /* Add the rndis header */
 928         filter_pkt = (struct rndis_filter_packet *)pkt->extension;
 929
 930         rndis_msg = &filter_pkt->msg;
 931         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 932         if (isvlan)
 933                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 934
 935         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 936         rndis_msg->msg_len = pkt->total_data_buflen +
 937                                       rndis_msg_size;
 938
 939         rndis_pkt = &rndis_msg->msg.pkt;
 940         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 941         if (isvlan)
 942                 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
 943         rndis_pkt->data_len = pkt->total_data_buflen;
 944
 945         if (isvlan) {
 946                 struct rndis_per_packet_info *ppi;
 947                 struct ndis_pkt_8021q_info *vlan;
 948
 949                 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 950                 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
 951
 952                 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
 953                         rndis_pkt->per_pkt_info_offset);
 954                 ppi->size = NDIS_VLAN_PPI_SIZE;
 955                 ppi->type = IEEE_8021Q_INFO;
 956                 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 957
 958                 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
 959                         ppi->ppi_offset);
 960                 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
 961                 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 962         }
 963
 964         pkt->is_data_pkt = true;
 965         pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
 966         pkt->page_buf[0].offset =
 967                         (unsigned long)rndis_msg & (PAGE_SIZE-1);
 968         pkt->page_buf[0].len = rndis_msg_size;
 969
 970         /* Add one page_buf if the rndis msg goes beyond page boundary */
 971         if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
 972                 int i;
 973                 for (i = pkt->page_buf_cnt; i > 1; i--)
 974                         pkt->page_buf[i] = pkt->page_buf[i-1];
 975                 pkt->page_buf_cnt++;
 976                 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
 977                 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
 978                         rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
 979                 pkt->page_buf[1].offset = 0;
 980                 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
 981         }
 982
 983         /* Save the packet send completion and context */
 984         filter_pkt->completion = pkt->completion.send.send_completion;
 985         filter_pkt->completion_ctx =
 986                                 pkt->completion.send.send_completion_ctx;
 987
 988         /* Use ours */
 989         pkt->completion.send.send_completion = rndis_filter_send_completion;
 990         pkt->completion.send.send_completion_ctx = filter_pkt;
 991
 992         ret = netvsc_send(dev, pkt);
 993         if (ret != 0) {
 994                 /*
 995                  * Reset the completion to originals to allow retries from
 996                  * above
 997                  */
 998                 pkt->completion.send.send_completion =
 999                                 filter_pkt->completion;
1000                 pkt->completion.send.send_completion_ctx =
1001                                 filter_pkt->completion_ctx;
1002         }
1003
1004         return ret;
1005 }
1006
1007 static void rndis_filter_send_completion(void *ctx)
1008 {
1009         struct rndis_filter_packet *filter_pkt = ctx;
1010
1011         /* Pass it back to the original handler */
1012         filter_pkt->completion(filter_pkt->completion_ctx);
1013 }