drivers/hv/hv_kvp.c

   1 /*
   2  * An implementation of key value pair (KVP) functionality for Linux.
   3  *
   4  *
   5  * Copyright (C) 2010, Novell, Inc.
   6  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/net.h>
  26 #include <linux/nls.h>
  27 #include <linux/connector.h>
  28 #include <linux/workqueue.h>
  29 #include <linux/hyperv.h>
  30
  31
  32 /*
  33  * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
  34  */
  35 #define WS2008_SRV_MAJOR        1
  36 #define WS2008_SRV_MINOR        0
  37 #define WS2008_SRV_VERSION     (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR)
  38
  39 #define WIN7_SRV_MAJOR   3
  40 #define WIN7_SRV_MINOR   0
  41 #define WIN7_SRV_VERSION     (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
  42
  43 #define WIN8_SRV_MAJOR   4
  44 #define WIN8_SRV_MINOR   0
  45 #define WIN8_SRV_VERSION     (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
  46
  47 /*
  48  * Global state maintained for transaction that is being processed.
  49  * Note that only one transaction can be active at any point in time.
  50  *
  51  * This state is set when we receive a request from the host; we
  52  * cleanup this state when the transaction is completed - when we respond
  53  * to the host with the key value.
  54  */
  55
  56 static struct {
  57         bool active; /* transaction status - active or not */
  58         int recv_len; /* number of bytes received. */
  59         struct hv_kvp_msg  *kvp_msg; /* current message */
  60         struct vmbus_channel *recv_channel; /* chn we got the request */
  61         u64 recv_req_id; /* request ID. */
  62         void *kvp_context; /* for the channel callback */
  63 } kvp_transaction;
  64
  65 /*
  66  * Before we can accept KVP messages from the host, we need
  67  * to handshake with the user level daemon. This state tracks
  68  * if we are in the handshake phase.
  69  */
  70 static bool in_hand_shake = true;
  71
  72 /*
  73  * This state maintains the version number registered by the daemon.
  74  */
  75 static int dm_reg_value;
  76
  77 static void kvp_send_key(struct work_struct *dummy);
  78
  79
  80 static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
  81 static void kvp_work_func(struct work_struct *dummy);
  82 static void kvp_register(int);
  83
  84 static DECLARE_DELAYED_WORK(kvp_work, kvp_work_func);
  85 static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
  86
  87 static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL };
  88 static const char kvp_name[] = "kvp_kernel_module";
  89 static u8 *recv_buffer;
  90 /*
  91  * Register the kernel component with the user-level daemon.
  92  * As part of this registration, pass the LIC version number.
  93  * This number has no meaning, it satisfies the registration protocol.
  94  */
  95 #define HV_DRV_VERSION           "3.1"
  96
  97 static void
  98 kvp_register(int reg_value)
  99 {
 100
 101         struct cn_msg *msg;
 102         struct hv_kvp_msg *kvp_msg;
 103         char *version;
 104
 105         msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg), GFP_ATOMIC);
 106
 107         if (msg) {
 108                 kvp_msg = (struct hv_kvp_msg *)msg->data;
 109                 version = kvp_msg->body.kvp_register.version;
 110                 msg->id.idx =  CN_KVP_IDX;
 111                 msg->id.val = CN_KVP_VAL;
 112
 113                 kvp_msg->kvp_hdr.operation = reg_value;
 114                 strcpy(version, HV_DRV_VERSION);
 115                 msg->len = sizeof(struct hv_kvp_msg);
 116                 cn_netlink_send(msg, 0, GFP_ATOMIC);
 117                 kfree(msg);
 118         }
 119 }
 120 static void
 121 kvp_work_func(struct work_struct *dummy)
 122 {
 123         /*
 124          * If the timer fires, the user-mode component has not responded;
 125          * process the pending transaction.
 126          */
 127         kvp_respond_to_host(NULL, HV_E_FAIL);
 128 }
 129
 130 static void poll_channel(struct vmbus_channel *channel)
 131 {
 132         unsigned long flags;
 133
 134         spin_lock_irqsave(&channel->inbound_lock, flags);
 135         hv_kvp_onchannelcallback(channel);
 136         spin_unlock_irqrestore(&channel->inbound_lock, flags);
 137 }
 138
 139 static int kvp_handle_handshake(struct hv_kvp_msg *msg)
 140 {
 141         int ret = 1;
 142
 143         switch (msg->kvp_hdr.operation) {
 144         case KVP_OP_REGISTER:
 145                 dm_reg_value = KVP_OP_REGISTER;
 146                 pr_info("KVP: IP injection functionality not available\n");
 147                 pr_info("KVP: Upgrade the KVP daemon\n");
 148                 break;
 149         case KVP_OP_REGISTER1:
 150                 dm_reg_value = KVP_OP_REGISTER1;
 151                 break;
 152         default:
 153                 pr_info("KVP: incompatible daemon\n");
 154                 pr_info("KVP: KVP version: %d, Daemon version: %d\n",
 155                         KVP_OP_REGISTER1, msg->kvp_hdr.operation);
 156                 ret = 0;
 157         }
 158
 159         if (ret) {
 160                 /*
 161                  * We have a compatible daemon; complete the handshake.
 162                  */
 163                 pr_info("KVP: user-mode registering done.\n");
 164                 kvp_register(dm_reg_value);
 165                 kvp_transaction.active = false;
 166                 if (kvp_transaction.kvp_context)
 167                         poll_channel(kvp_transaction.kvp_context);
 168         }
 169         return ret;
 170 }
 171
 172
 173 /*
 174  * Callback when data is received from user mode.
 175  */
 176
 177 static void
 178 kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
 179 {
 180         struct hv_kvp_msg *message;
 181         struct hv_kvp_msg_enumerate *data;
 182         int     error = 0;
 183
 184         message = (struct hv_kvp_msg *)msg->data;
 185
 186         /*
 187          * If we are negotiating the version information
 188          * with the daemon; handle that first.
 189          */
 190
 191         if (in_hand_shake) {
 192                 if (kvp_handle_handshake(message))
 193                         in_hand_shake = false;
 194                 return;
 195         }
 196
 197         /*
 198          * Based on the version of the daemon, we propagate errors from the
 199          * daemon differently.
 200          */
 201
 202         data = &message->body.kvp_enum_data;
 203
 204         switch (dm_reg_value) {
 205         case KVP_OP_REGISTER:
 206                 /*
 207                  * Null string is used to pass back error condition.
 208                  */
 209                 if (data->data.key[0] == 0)
 210                         error = HV_S_CONT;
 211                 break;
 212
 213         case KVP_OP_REGISTER1:
 214                 /*
 215                  * We use the message header information from
 216                  * the user level daemon to transmit errors.
 217                  */
 218                 error = message->error;
 219                 break;
 220         }
 221
 222         /*
 223          * Complete the transaction by forwarding the key value
 224          * to the host. But first, cancel the timeout.
 225          */
 226         if (cancel_delayed_work_sync(&kvp_work))
 227                 kvp_respond_to_host(message, error);
 228 }
 229
 230
 231 static int process_ob_ipinfo(void *in_msg, void *out_msg, int op)
 232 {
 233         struct hv_kvp_msg *in = in_msg;
 234         struct hv_kvp_ip_msg *out = out_msg;
 235         int len;
 236
 237         switch (op) {
 238         case KVP_OP_GET_IP_INFO:
 239                 /*
 240                  * Transform all parameters into utf16 encoding.
 241                  */
 242                 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr,
 243                                 strlen((char *)in->body.kvp_ip_val.ip_addr),
 244                                 UTF16_HOST_ENDIAN,
 245                                 (wchar_t *)out->kvp_ip_val.ip_addr,
 246                                 MAX_IP_ADDR_SIZE);
 247                 if (len < 0)
 248                         return len;
 249
 250                 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net,
 251                                 strlen((char *)in->body.kvp_ip_val.sub_net),
 252                                 UTF16_HOST_ENDIAN,
 253                                 (wchar_t *)out->kvp_ip_val.sub_net,
 254                                 MAX_IP_ADDR_SIZE);
 255                 if (len < 0)
 256                         return len;
 257
 258                 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way,
 259                                 strlen((char *)in->body.kvp_ip_val.gate_way),
 260                                 UTF16_HOST_ENDIAN,
 261                                 (wchar_t *)out->kvp_ip_val.gate_way,
 262                                 MAX_GATEWAY_SIZE);
 263                 if (len < 0)
 264                         return len;
 265
 266                 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr,
 267                                 strlen((char *)in->body.kvp_ip_val.dns_addr),
 268                                 UTF16_HOST_ENDIAN,
 269                                 (wchar_t *)out->kvp_ip_val.dns_addr,
 270                                 MAX_IP_ADDR_SIZE);
 271                 if (len < 0)
 272                         return len;
 273
 274                 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id,
 275                                 strlen((char *)in->body.kvp_ip_val.adapter_id),
 276                                 UTF16_HOST_ENDIAN,
 277                                 (wchar_t *)out->kvp_ip_val.adapter_id,
 278                                 MAX_IP_ADDR_SIZE);
 279                 if (len < 0)
 280                         return len;
 281
 282                 out->kvp_ip_val.dhcp_enabled =
 283                         in->body.kvp_ip_val.dhcp_enabled;
 284                 out->kvp_ip_val.addr_family =
 285                         in->body.kvp_ip_val.addr_family;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
 292 {
 293         struct hv_kvp_ip_msg *in = in_msg;
 294         struct hv_kvp_msg *out = out_msg;
 295
 296         switch (op) {
 297         case KVP_OP_SET_IP_INFO:
 298                 /*
 299                  * Transform all parameters into utf8 encoding.
 300                  */
 301                 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr,
 302                                 MAX_IP_ADDR_SIZE,
 303                                 UTF16_LITTLE_ENDIAN,
 304                                 (__u8 *)out->body.kvp_ip_val.ip_addr,
 305                                 MAX_IP_ADDR_SIZE);
 306
 307                 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net,
 308                                 MAX_IP_ADDR_SIZE,
 309                                 UTF16_LITTLE_ENDIAN,
 310                                 (__u8 *)out->body.kvp_ip_val.sub_net,
 311                                 MAX_IP_ADDR_SIZE);
 312
 313                 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way,
 314                                 MAX_GATEWAY_SIZE,
 315                                 UTF16_LITTLE_ENDIAN,
 316                                 (__u8 *)out->body.kvp_ip_val.gate_way,
 317                                 MAX_GATEWAY_SIZE);
 318
 319                 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr,
 320                                 MAX_IP_ADDR_SIZE,
 321                                 UTF16_LITTLE_ENDIAN,
 322                                 (__u8 *)out->body.kvp_ip_val.dns_addr,
 323                                 MAX_IP_ADDR_SIZE);
 324
 325                 out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
 326
 327         default:
 328                 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
 329                                 MAX_ADAPTER_ID_SIZE,
 330                                 UTF16_LITTLE_ENDIAN,
 331                                 (__u8 *)out->body.kvp_ip_val.adapter_id,
 332                                 MAX_ADAPTER_ID_SIZE);
 333
 334                 out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family;
 335         }
 336 }
 337
 338
 339
 340
 341 static void
 342 kvp_send_key(struct work_struct *dummy)
 343 {
 344         struct cn_msg *msg;
 345         struct hv_kvp_msg *message;
 346         struct hv_kvp_msg *in_msg;
 347         __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
 348         __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
 349         __u32 val32;
 350         __u64 val64;
 351
 352         msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
 353         if (!msg)
 354                 return;
 355
 356         msg->id.idx =  CN_KVP_IDX;
 357         msg->id.val = CN_KVP_VAL;
 358
 359         message = (struct hv_kvp_msg *)msg->data;
 360         message->kvp_hdr.operation = operation;
 361         message->kvp_hdr.pool = pool;
 362         in_msg = kvp_transaction.kvp_msg;
 363
 364         /*
 365          * The key/value strings sent from the host are encoded in
 366          * in utf16; convert it to utf8 strings.
 367          * The host assures us that the utf16 strings will not exceed
 368          * the max lengths specified. We will however, reserve room
 369          * for the string terminating character - in the utf16s_utf8s()
 370          * function we limit the size of the buffer where the converted
 371          * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
 372          * that the strings can be properly terminated!
 373          */
 374
 375         switch (message->kvp_hdr.operation) {
 376         case KVP_OP_SET_IP_INFO:
 377                 process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
 378                 break;
 379         case KVP_OP_GET_IP_INFO:
 380                 process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
 381                 break;
 382         case KVP_OP_SET:
 383                 switch (in_msg->body.kvp_set.data.value_type) {
 384                 case REG_SZ:
 385                         /*
 386                          * The value is a string - utf16 encoding.
 387                          */
 388                         message->body.kvp_set.data.value_size =
 389                                 utf16s_to_utf8s(
 390                                 (wchar_t *)in_msg->body.kvp_set.data.value,
 391                                 in_msg->body.kvp_set.data.value_size,
 392                                 UTF16_LITTLE_ENDIAN,
 393                                 message->body.kvp_set.data.value,
 394                                 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
 395                                 break;
 396
 397                 case REG_U32:
 398                         /*
 399                          * The value is a 32 bit scalar.
 400                          * We save this as a utf8 string.
 401                          */
 402                         val32 = in_msg->body.kvp_set.data.value_u32;
 403                         message->body.kvp_set.data.value_size =
 404                                 sprintf(message->body.kvp_set.data.value,
 405                                         "%d", val32) + 1;
 406                         break;
 407
 408                 case REG_U64:
 409                         /*
 410                          * The value is a 64 bit scalar.
 411                          * We save this as a utf8 string.
 412                          */
 413                         val64 = in_msg->body.kvp_set.data.value_u64;
 414                         message->body.kvp_set.data.value_size =
 415                                 sprintf(message->body.kvp_set.data.value,
 416                                         "%llu", val64) + 1;
 417                         break;
 418
 419                 }
 420         case KVP_OP_GET:
 421                 message->body.kvp_set.data.key_size =
 422                         utf16s_to_utf8s(
 423                         (wchar_t *)in_msg->body.kvp_set.data.key,
 424                         in_msg->body.kvp_set.data.key_size,
 425                         UTF16_LITTLE_ENDIAN,
 426                         message->body.kvp_set.data.key,
 427                         HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
 428                         break;
 429
 430         case KVP_OP_DELETE:
 431                 message->body.kvp_delete.key_size =
 432                         utf16s_to_utf8s(
 433                         (wchar_t *)in_msg->body.kvp_delete.key,
 434                         in_msg->body.kvp_delete.key_size,
 435                         UTF16_LITTLE_ENDIAN,
 436                         message->body.kvp_delete.key,
 437                         HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
 438                         break;
 439
 440         case KVP_OP_ENUMERATE:
 441                 message->body.kvp_enum_data.index =
 442                         in_msg->body.kvp_enum_data.index;
 443                         break;
 444         }
 445
 446         msg->len = sizeof(struct hv_kvp_msg);
 447         cn_netlink_send(msg, 0, GFP_ATOMIC);
 448         kfree(msg);
 449
 450         return;
 451 }
 452
 453 /*
 454  * Send a response back to the host.
 455  */
 456
 457 static void
 458 kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error)
 459 {
 460         struct hv_kvp_msg  *kvp_msg;
 461         struct hv_kvp_exchg_msg_value  *kvp_data;
 462         char    *key_name;
 463         char    *value;
 464         struct icmsg_hdr *icmsghdrp;
 465         int     keylen = 0;
 466         int     valuelen = 0;
 467         u32     buf_len;
 468         struct vmbus_channel *channel;
 469         u64     req_id;
 470         int ret;
 471
 472         /*
 473          * If a transaction is not active; log and return.
 474          */
 475
 476         if (!kvp_transaction.active) {
 477                 /*
 478                  * This is a spurious call!
 479                  */
 480                 pr_warn("KVP: Transaction not active\n");
 481                 return;
 482         }
 483         /*
 484          * Copy the global state for completing the transaction. Note that
 485          * only one transaction can be active at a time.
 486          */
 487
 488         buf_len = kvp_transaction.recv_len;
 489         channel = kvp_transaction.recv_channel;
 490         req_id = kvp_transaction.recv_req_id;
 491
 492         kvp_transaction.active = false;
 493
 494         icmsghdrp = (struct icmsg_hdr *)
 495                         &recv_buffer[sizeof(struct vmbuspipe_hdr)];
 496
 497         if (channel->onchannel_callback == NULL)
 498                 /*
 499                  * We have raced with util driver being unloaded;
 500                  * silently return.
 501                  */
 502                 return;
 503
 504         icmsghdrp->status = error;
 505
 506         /*
 507          * If the error parameter is set, terminate the host's enumeration
 508          * on this pool.
 509          */
 510         if (error) {
 511                 /*
 512                  * Something failed or we have timedout;
 513                  * terminate the current host-side iteration.
 514                  */
 515                 goto response_done;
 516         }
 517
 518         kvp_msg = (struct hv_kvp_msg *)
 519                         &recv_buffer[sizeof(struct vmbuspipe_hdr) +
 520                         sizeof(struct icmsg_hdr)];
 521
 522         switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
 523         case KVP_OP_GET_IP_INFO:
 524                 ret = process_ob_ipinfo(msg_to_host,
 525                                  (struct hv_kvp_ip_msg *)kvp_msg,
 526                                  KVP_OP_GET_IP_INFO);
 527                 if (ret < 0)
 528                         icmsghdrp->status = HV_E_FAIL;
 529
 530                 goto response_done;
 531         case KVP_OP_SET_IP_INFO:
 532                 goto response_done;
 533         case KVP_OP_GET:
 534                 kvp_data = &kvp_msg->body.kvp_get.data;
 535                 goto copy_value;
 536
 537         case KVP_OP_SET:
 538         case KVP_OP_DELETE:
 539                 goto response_done;
 540
 541         default:
 542                 break;
 543         }
 544
 545         kvp_data = &kvp_msg->body.kvp_enum_data.data;
 546         key_name = msg_to_host->body.kvp_enum_data.data.key;
 547
 548         /*
 549          * The windows host expects the key/value pair to be encoded
 550          * in utf16. Ensure that the key/value size reported to the host
 551          * will be less than or equal to the MAX size (including the
 552          * terminating character).
 553          */
 554         keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
 555                                 (wchar_t *) kvp_data->key,
 556                                 (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
 557         kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
 558
 559 copy_value:
 560         value = msg_to_host->body.kvp_enum_data.data.value;
 561         valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
 562                                 (wchar_t *) kvp_data->value,
 563                                 (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
 564         kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
 565
 566         /*
 567          * If the utf8s to utf16s conversion failed; notify host
 568          * of the error.
 569          */
 570         if ((keylen < 0) || (valuelen < 0))
 571                 icmsghdrp->status = HV_E_FAIL;
 572
 573         kvp_data->value_type = REG_SZ; /* all our values are strings */
 574
 575 response_done:
 576         icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
 577
 578         vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
 579                                 VM_PKT_DATA_INBAND, 0);
 580         poll_channel(channel);
 581
 582 }
 583
 584 /*
 585  * This callback is invoked when we get a KVP message from the host.
 586  * The host ensures that only one KVP transaction can be active at a time.
 587  * KVP implementation in Linux needs to forward the key to a user-mde
 588  * component to retrive the corresponding value. Consequently, we cannot
 589  * respond to the host in the conext of this callback. Since the host
 590  * guarantees that at most only one transaction can be active at a time,
 591  * we stash away the transaction state in a set of global variables.
 592  */
 593
 594 void hv_kvp_onchannelcallback(void *context)
 595 {
 596         struct vmbus_channel *channel = context;
 597         u32 recvlen;
 598         u64 requestid;
 599
 600         struct hv_kvp_msg *kvp_msg;
 601
 602         struct icmsg_hdr *icmsghdrp;
 603         struct icmsg_negotiate *negop = NULL;
 604         int util_fw_version;
 605         int kvp_srv_version;
 606
 607         if (kvp_transaction.active) {
 608                 /*
 609                  * We will defer processing this callback once
 610                  * the current transaction is complete.
 611                  */
 612                 kvp_transaction.kvp_context = context;
 613                 return;
 614         }
 615
 616         vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
 617                          &requestid);
 618
 619         if (recvlen > 0) {
 620                 icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
 621                         sizeof(struct vmbuspipe_hdr)];
 622
 623                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 624                         /*
 625                          * Based on the host, select appropriate
 626                          * framework and service versions we will
 627                          * negotiate.
 628                          */
 629                         switch (vmbus_proto_version) {
 630                         case (VERSION_WS2008):
 631                                 util_fw_version = UTIL_WS2K8_FW_VERSION;
 632                                 kvp_srv_version = WS2008_SRV_VERSION;
 633                                 break;
 634                         case (VERSION_WIN7):
 635                                 util_fw_version = UTIL_FW_VERSION;
 636                                 kvp_srv_version = WIN7_SRV_VERSION;
 637                                 break;
 638                         default:
 639                                 util_fw_version = UTIL_FW_VERSION;
 640                                 kvp_srv_version = WIN8_SRV_VERSION;
 641                         }
 642                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 643                                  recv_buffer, util_fw_version,
 644                                  kvp_srv_version);
 645
 646                 } else {
 647                         kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
 648                                 sizeof(struct vmbuspipe_hdr) +
 649                                 sizeof(struct icmsg_hdr)];
 650
 651                         /*
 652                          * Stash away this global state for completing the
 653                          * transaction; note transactions are serialized.
 654                          */
 655
 656                         kvp_transaction.recv_len = recvlen;
 657                         kvp_transaction.recv_channel = channel;
 658                         kvp_transaction.recv_req_id = requestid;
 659                         kvp_transaction.active = true;
 660                         kvp_transaction.kvp_msg = kvp_msg;
 661
 662                         /*
 663                          * Get the information from the
 664                          * user-mode component.
 665                          * component. This transaction will be
 666                          * completed when we get the value from
 667                          * the user-mode component.
 668                          * Set a timeout to deal with
 669                          * user-mode not responding.
 670                          */
 671                         schedule_work(&kvp_sendkey_work);
 672                         schedule_delayed_work(&kvp_work, 5*HZ);
 673
 674                         return;
 675
 676                 }
 677
 678                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 679                         | ICMSGHDRFLAG_RESPONSE;
 680
 681                 vmbus_sendpacket(channel, recv_buffer,
 682                                        recvlen, requestid,
 683                                        VM_PKT_DATA_INBAND, 0);
 684         }
 685
 686 }
 687
 688 int
 689 hv_kvp_init(struct hv_util_service *srv)
 690 {
 691         int err;
 692
 693         err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
 694         if (err)
 695                 return err;
 696         recv_buffer = srv->recv_buffer;
 697
 698         /*
 699          * When this driver loads, the user level daemon that
 700          * processes the host requests may not yet be running.
 701          * Defer processing channel callbacks until the daemon
 702          * has registered.
 703          */
 704         kvp_transaction.active = true;
 705
 706         return 0;
 707 }
 708
 709 void hv_kvp_deinit(void)
 710 {
 711         cn_del_callback(&kvp_id);
 712         cancel_delayed_work_sync(&kvp_work);
 713         cancel_work_sync(&kvp_sendkey_work);
 714 }