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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#include "hyperv_vmbus.h"
32#include "hv_utils_transport.h"
33
34/*
35 * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
36 */
37#define WS2008_SRV_MAJOR 1
38#define WS2008_SRV_MINOR 0
39#define WS2008_SRV_VERSION (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR)
40
41#define WIN7_SRV_MAJOR 3
42#define WIN7_SRV_MINOR 0
43#define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
44
45#define WIN8_SRV_MAJOR 4
46#define WIN8_SRV_MINOR 0
47#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
48
49/*
50 * Global state maintained for transaction that is being processed. For a class
51 * of integration services, including the "KVP service", the specified protocol
52 * is a "request/response" protocol which means that there can only be single
53 * outstanding transaction from the host at any given point in time. We use
54 * this to simplify memory management in this driver - we cache and process
55 * only one message at a time.
56 *
57 * While the request/response protocol is guaranteed by the host, we further
58 * ensure this by serializing packet processing in this driver - we do not
59 * read additional packets from the VMBUs until the current packet is fully
60 * handled.
61 */
62
63static struct {
64 int state; /* hvutil_device_state */
65 int recv_len; /* number of bytes received. */
66 struct hv_kvp_msg *kvp_msg; /* current message */
67 struct vmbus_channel *recv_channel; /* chn we got the request */
68 u64 recv_req_id; /* request ID. */
69} kvp_transaction;
70
71/*
72 * This state maintains the version number registered by the daemon.
73 */
74static int dm_reg_value;
75
76static void kvp_send_key(struct work_struct *dummy);
77
78
79static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
80static void kvp_timeout_func(struct work_struct *dummy);
81static void kvp_register(int);
82
83static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func);
84static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
85
86static const char kvp_devname[] = "vmbus/hv_kvp";
87static u8 *recv_buffer;
88static struct hvutil_transport *hvt;
89/*
90 * Register the kernel component with the user-level daemon.
91 * As part of this registration, pass the LIC version number.
92 * This number has no meaning, it satisfies the registration protocol.
93 */
94#define HV_DRV_VERSION "3.1"
95
96static void kvp_poll_wrapper(void *channel)
97{
98 /* Transaction is finished, reset the state here to avoid races. */
99 kvp_transaction.state = HVUTIL_READY;
100 hv_kvp_onchannelcallback(channel);
101}
102
103static void
104kvp_register(int reg_value)
105{
106
107 struct hv_kvp_msg *kvp_msg;
108 char *version;
109
110 kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL);
111
112 if (kvp_msg) {
113 version = kvp_msg->body.kvp_register.version;
114 kvp_msg->kvp_hdr.operation = reg_value;
115 strcpy(version, HV_DRV_VERSION);
116
117 hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg));
118 kfree(kvp_msg);
119 }
120}
121
122static void kvp_timeout_func(struct work_struct *dummy)
123{
124 /*
125 * If the timer fires, the user-mode component has not responded;
126 * process the pending transaction.
127 */
128 kvp_respond_to_host(NULL, HV_E_FAIL);
129
130 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
131}
132
133static int kvp_handle_handshake(struct hv_kvp_msg *msg)
134{
135 switch (msg->kvp_hdr.operation) {
136 case KVP_OP_REGISTER:
137 dm_reg_value = KVP_OP_REGISTER;
138 pr_info("KVP: IP injection functionality not available\n");
139 pr_info("KVP: Upgrade the KVP daemon\n");
140 break;
141 case KVP_OP_REGISTER1:
142 dm_reg_value = KVP_OP_REGISTER1;
143 break;
144 default:
145 pr_info("KVP: incompatible daemon\n");
146 pr_info("KVP: KVP version: %d, Daemon version: %d\n",
147 KVP_OP_REGISTER1, msg->kvp_hdr.operation);
148 return -EINVAL;
149 }
150
151 /*
152 * We have a compatible daemon; complete the handshake.
153 */
154 pr_debug("KVP: userspace daemon ver. %d registered\n",
155 KVP_OP_REGISTER);
156 kvp_register(dm_reg_value);
157 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
158
159 return 0;
160}
161
162
163/*
164 * Callback when data is received from user mode.
165 */
166
167static int kvp_on_msg(void *msg, int len)
168{
169 struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg;
170 struct hv_kvp_msg_enumerate *data;
171 int error = 0;
172
173 if (len < sizeof(*message))
174 return -EINVAL;
175
176 /*
177 * If we are negotiating the version information
178 * with the daemon; handle that first.
179 */
180
181 if (kvp_transaction.state < HVUTIL_READY) {
182 return kvp_handle_handshake(message);
183 }
184
185 /* We didn't send anything to userspace so the reply is spurious */
186 if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
187 return -EINVAL;
188
189 kvp_transaction.state = HVUTIL_USERSPACE_RECV;
190
191 /*
192 * Based on the version of the daemon, we propagate errors from the
193 * daemon differently.
194 */
195
196 data = &message->body.kvp_enum_data;
197
198 switch (dm_reg_value) {
199 case KVP_OP_REGISTER:
200 /*
201 * Null string is used to pass back error condition.
202 */
203 if (data->data.key[0] == 0)
204 error = HV_S_CONT;
205 break;
206
207 case KVP_OP_REGISTER1:
208 /*
209 * We use the message header information from
210 * the user level daemon to transmit errors.
211 */
212 error = message->error;
213 break;
214 }
215
216 /*
217 * Complete the transaction by forwarding the key value
218 * to the host. But first, cancel the timeout.
219 */
220 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
221 kvp_respond_to_host(message, error);
222 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
223 }
224
225 return 0;
226}
227
228
229static int process_ob_ipinfo(void *in_msg, void *out_msg, int op)
230{
231 struct hv_kvp_msg *in = in_msg;
232 struct hv_kvp_ip_msg *out = out_msg;
233 int len;
234
235 switch (op) {
236 case KVP_OP_GET_IP_INFO:
237 /*
238 * Transform all parameters into utf16 encoding.
239 */
240 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr,
241 strlen((char *)in->body.kvp_ip_val.ip_addr),
242 UTF16_HOST_ENDIAN,
243 (wchar_t *)out->kvp_ip_val.ip_addr,
244 MAX_IP_ADDR_SIZE);
245 if (len < 0)
246 return len;
247
248 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net,
249 strlen((char *)in->body.kvp_ip_val.sub_net),
250 UTF16_HOST_ENDIAN,
251 (wchar_t *)out->kvp_ip_val.sub_net,
252 MAX_IP_ADDR_SIZE);
253 if (len < 0)
254 return len;
255
256 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way,
257 strlen((char *)in->body.kvp_ip_val.gate_way),
258 UTF16_HOST_ENDIAN,
259 (wchar_t *)out->kvp_ip_val.gate_way,
260 MAX_GATEWAY_SIZE);
261 if (len < 0)
262 return len;
263
264 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr,
265 strlen((char *)in->body.kvp_ip_val.dns_addr),
266 UTF16_HOST_ENDIAN,
267 (wchar_t *)out->kvp_ip_val.dns_addr,
268 MAX_IP_ADDR_SIZE);
269 if (len < 0)
270 return len;
271
272 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id,
273 strlen((char *)in->body.kvp_ip_val.adapter_id),
274 UTF16_HOST_ENDIAN,
275 (wchar_t *)out->kvp_ip_val.adapter_id,
276 MAX_IP_ADDR_SIZE);
277 if (len < 0)
278 return len;
279
280 out->kvp_ip_val.dhcp_enabled =
281 in->body.kvp_ip_val.dhcp_enabled;
282 out->kvp_ip_val.addr_family =
283 in->body.kvp_ip_val.addr_family;
284 }
285
286 return 0;
287}
288
289static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
290{
291 struct hv_kvp_ip_msg *in = in_msg;
292 struct hv_kvp_msg *out = out_msg;
293
294 switch (op) {
295 case KVP_OP_SET_IP_INFO:
296 /*
297 * Transform all parameters into utf8 encoding.
298 */
299 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr,
300 MAX_IP_ADDR_SIZE,
301 UTF16_LITTLE_ENDIAN,
302 (__u8 *)out->body.kvp_ip_val.ip_addr,
303 MAX_IP_ADDR_SIZE);
304
305 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net,
306 MAX_IP_ADDR_SIZE,
307 UTF16_LITTLE_ENDIAN,
308 (__u8 *)out->body.kvp_ip_val.sub_net,
309 MAX_IP_ADDR_SIZE);
310
311 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way,
312 MAX_GATEWAY_SIZE,
313 UTF16_LITTLE_ENDIAN,
314 (__u8 *)out->body.kvp_ip_val.gate_way,
315 MAX_GATEWAY_SIZE);
316
317 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr,
318 MAX_IP_ADDR_SIZE,
319 UTF16_LITTLE_ENDIAN,
320 (__u8 *)out->body.kvp_ip_val.dns_addr,
321 MAX_IP_ADDR_SIZE);
322
323 out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
324
325 default:
326 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
327 MAX_ADAPTER_ID_SIZE,
328 UTF16_LITTLE_ENDIAN,
329 (__u8 *)out->body.kvp_ip_val.adapter_id,
330 MAX_ADAPTER_ID_SIZE);
331
332 out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family;
333 }
334}
335
336
337
338
339static void
340kvp_send_key(struct work_struct *dummy)
341{
342 struct hv_kvp_msg *message;
343 struct hv_kvp_msg *in_msg;
344 __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
345 __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
346 __u32 val32;
347 __u64 val64;
348 int rc;
349
350 /* The transaction state is wrong. */
351 if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
352 return;
353
354 message = kzalloc(sizeof(*message), GFP_KERNEL);
355 if (!message)
356 return;
357
358 message->kvp_hdr.operation = operation;
359 message->kvp_hdr.pool = pool;
360 in_msg = kvp_transaction.kvp_msg;
361
362 /*
363 * The key/value strings sent from the host are encoded in
364 * in utf16; convert it to utf8 strings.
365 * The host assures us that the utf16 strings will not exceed
366 * the max lengths specified. We will however, reserve room
367 * for the string terminating character - in the utf16s_utf8s()
368 * function we limit the size of the buffer where the converted
369 * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
370 * that the strings can be properly terminated!
371 */
372
373 switch (message->kvp_hdr.operation) {
374 case KVP_OP_SET_IP_INFO:
375 process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
376 break;
377 case KVP_OP_GET_IP_INFO:
378 process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
379 break;
380 case KVP_OP_SET:
381 switch (in_msg->body.kvp_set.data.value_type) {
382 case REG_SZ:
383 /*
384 * The value is a string - utf16 encoding.
385 */
386 message->body.kvp_set.data.value_size =
387 utf16s_to_utf8s(
388 (wchar_t *)in_msg->body.kvp_set.data.value,
389 in_msg->body.kvp_set.data.value_size,
390 UTF16_LITTLE_ENDIAN,
391 message->body.kvp_set.data.value,
392 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
393 break;
394
395 case REG_U32:
396 /*
397 * The value is a 32 bit scalar.
398 * We save this as a utf8 string.
399 */
400 val32 = in_msg->body.kvp_set.data.value_u32;
401 message->body.kvp_set.data.value_size =
402 sprintf(message->body.kvp_set.data.value,
403 "%d", val32) + 1;
404 break;
405
406 case REG_U64:
407 /*
408 * The value is a 64 bit scalar.
409 * We save this as a utf8 string.
410 */
411 val64 = in_msg->body.kvp_set.data.value_u64;
412 message->body.kvp_set.data.value_size =
413 sprintf(message->body.kvp_set.data.value,
414 "%llu", val64) + 1;
415 break;
416
417 }
418 case KVP_OP_GET:
419 message->body.kvp_set.data.key_size =
420 utf16s_to_utf8s(
421 (wchar_t *)in_msg->body.kvp_set.data.key,
422 in_msg->body.kvp_set.data.key_size,
423 UTF16_LITTLE_ENDIAN,
424 message->body.kvp_set.data.key,
425 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
426 break;
427
428 case KVP_OP_DELETE:
429 message->body.kvp_delete.key_size =
430 utf16s_to_utf8s(
431 (wchar_t *)in_msg->body.kvp_delete.key,
432 in_msg->body.kvp_delete.key_size,
433 UTF16_LITTLE_ENDIAN,
434 message->body.kvp_delete.key,
435 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
436 break;
437
438 case KVP_OP_ENUMERATE:
439 message->body.kvp_enum_data.index =
440 in_msg->body.kvp_enum_data.index;
441 break;
442 }
443
444 kvp_transaction.state = HVUTIL_USERSPACE_REQ;
445 rc = hvutil_transport_send(hvt, message, sizeof(*message));
446 if (rc) {
447 pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
448 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
449 kvp_respond_to_host(message, HV_E_FAIL);
450 kvp_transaction.state = HVUTIL_READY;
451 }
452 }
453
454 kfree(message);
455
456 return;
457}
458
459/*
460 * Send a response back to the host.
461 */
462
463static void
464kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error)
465{
466 struct hv_kvp_msg *kvp_msg;
467 struct hv_kvp_exchg_msg_value *kvp_data;
468 char *key_name;
469 char *value;
470 struct icmsg_hdr *icmsghdrp;
471 int keylen = 0;
472 int valuelen = 0;
473 u32 buf_len;
474 struct vmbus_channel *channel;
475 u64 req_id;
476 int ret;
477
478 /*
479 * Copy the global state for completing the transaction. Note that
480 * only one transaction can be active at a time.
481 */
482
483 buf_len = kvp_transaction.recv_len;
484 channel = kvp_transaction.recv_channel;
485 req_id = kvp_transaction.recv_req_id;
486
487 icmsghdrp = (struct icmsg_hdr *)
488 &recv_buffer[sizeof(struct vmbuspipe_hdr)];
489
490 if (channel->onchannel_callback == NULL)
491 /*
492 * We have raced with util driver being unloaded;
493 * silently return.
494 */
495 return;
496
497 icmsghdrp->status = error;
498
499 /*
500 * If the error parameter is set, terminate the host's enumeration
501 * on this pool.
502 */
503 if (error) {
504 /*
505 * Something failed or we have timedout;
506 * terminate the current host-side iteration.
507 */
508 goto response_done;
509 }
510
511 kvp_msg = (struct hv_kvp_msg *)
512 &recv_buffer[sizeof(struct vmbuspipe_hdr) +
513 sizeof(struct icmsg_hdr)];
514
515 switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
516 case KVP_OP_GET_IP_INFO:
517 ret = process_ob_ipinfo(msg_to_host,
518 (struct hv_kvp_ip_msg *)kvp_msg,
519 KVP_OP_GET_IP_INFO);
520 if (ret < 0)
521 icmsghdrp->status = HV_E_FAIL;
522
523 goto response_done;
524 case KVP_OP_SET_IP_INFO:
525 goto response_done;
526 case KVP_OP_GET:
527 kvp_data = &kvp_msg->body.kvp_get.data;
528 goto copy_value;
529
530 case KVP_OP_SET:
531 case KVP_OP_DELETE:
532 goto response_done;
533
534 default:
535 break;
536 }
537
538 kvp_data = &kvp_msg->body.kvp_enum_data.data;
539 key_name = msg_to_host->body.kvp_enum_data.data.key;
540
541 /*
542 * The windows host expects the key/value pair to be encoded
543 * in utf16. Ensure that the key/value size reported to the host
544 * will be less than or equal to the MAX size (including the
545 * terminating character).
546 */
547 keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
548 (wchar_t *) kvp_data->key,
549 (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
550 kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
551
552copy_value:
553 value = msg_to_host->body.kvp_enum_data.data.value;
554 valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
555 (wchar_t *) kvp_data->value,
556 (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
557 kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
558
559 /*
560 * If the utf8s to utf16s conversion failed; notify host
561 * of the error.
562 */
563 if ((keylen < 0) || (valuelen < 0))
564 icmsghdrp->status = HV_E_FAIL;
565
566 kvp_data->value_type = REG_SZ; /* all our values are strings */
567
568response_done:
569 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
570
571 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
572 VM_PKT_DATA_INBAND, 0);
573}
574
575/*
576 * This callback is invoked when we get a KVP message from the host.
577 * The host ensures that only one KVP transaction can be active at a time.
578 * KVP implementation in Linux needs to forward the key to a user-mde
579 * component to retrive the corresponding value. Consequently, we cannot
580 * respond to the host in the conext of this callback. Since the host
581 * guarantees that at most only one transaction can be active at a time,
582 * we stash away the transaction state in a set of global variables.
583 */
584
585void hv_kvp_onchannelcallback(void *context)
586{
587 struct vmbus_channel *channel = context;
588 u32 recvlen;
589 u64 requestid;
590
591 struct hv_kvp_msg *kvp_msg;
592
593 struct icmsg_hdr *icmsghdrp;
594 struct icmsg_negotiate *negop = NULL;
595 int util_fw_version;
596 int kvp_srv_version;
597
598 if (kvp_transaction.state > HVUTIL_READY)
599 return;
600
601 vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
602 &requestid);
603
604 if (recvlen > 0) {
605 icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
606 sizeof(struct vmbuspipe_hdr)];
607
608 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
609 /*
610 * Based on the host, select appropriate
611 * framework and service versions we will
612 * negotiate.
613 */
614 switch (vmbus_proto_version) {
615 case (VERSION_WS2008):
616 util_fw_version = UTIL_WS2K8_FW_VERSION;
617 kvp_srv_version = WS2008_SRV_VERSION;
618 break;
619 case (VERSION_WIN7):
620 util_fw_version = UTIL_FW_VERSION;
621 kvp_srv_version = WIN7_SRV_VERSION;
622 break;
623 default:
624 util_fw_version = UTIL_FW_VERSION;
625 kvp_srv_version = WIN8_SRV_VERSION;
626 }
627 vmbus_prep_negotiate_resp(icmsghdrp, negop,
628 recv_buffer, util_fw_version,
629 kvp_srv_version);
630
631 } else {
632 kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
633 sizeof(struct vmbuspipe_hdr) +
634 sizeof(struct icmsg_hdr)];
635
636 /*
637 * Stash away this global state for completing the
638 * transaction; note transactions are serialized.
639 */
640
641 kvp_transaction.recv_len = recvlen;
642 kvp_transaction.recv_req_id = requestid;
643 kvp_transaction.kvp_msg = kvp_msg;
644
645 if (kvp_transaction.state < HVUTIL_READY) {
646 /* Userspace is not registered yet */
647 kvp_respond_to_host(NULL, HV_E_FAIL);
648 return;
649 }
650 kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
651
652 /*
653 * Get the information from the
654 * user-mode component.
655 * component. This transaction will be
656 * completed when we get the value from
657 * the user-mode component.
658 * Set a timeout to deal with
659 * user-mode not responding.
660 */
661 schedule_work(&kvp_sendkey_work);
662 schedule_delayed_work(&kvp_timeout_work,
663 HV_UTIL_TIMEOUT * HZ);
664
665 return;
666
667 }
668
669 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
670 | ICMSGHDRFLAG_RESPONSE;
671
672 vmbus_sendpacket(channel, recv_buffer,
673 recvlen, requestid,
674 VM_PKT_DATA_INBAND, 0);
675 }
676
677}
678
679static void kvp_on_reset(void)
680{
681 if (cancel_delayed_work_sync(&kvp_timeout_work))
682 kvp_respond_to_host(NULL, HV_E_FAIL);
683 kvp_transaction.state = HVUTIL_DEVICE_INIT;
684}
685
686int
687hv_kvp_init(struct hv_util_service *srv)
688{
689 recv_buffer = srv->recv_buffer;
690 kvp_transaction.recv_channel = srv->channel;
691
692 /*
693 * When this driver loads, the user level daemon that
694 * processes the host requests may not yet be running.
695 * Defer processing channel callbacks until the daemon
696 * has registered.
697 */
698 kvp_transaction.state = HVUTIL_DEVICE_INIT;
699
700 hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL,
701 kvp_on_msg, kvp_on_reset);
702 if (!hvt)
703 return -EFAULT;
704
705 return 0;
706}
707
708void hv_kvp_deinit(void)
709{
710 kvp_transaction.state = HVUTIL_DEVICE_DYING;
711 cancel_delayed_work_sync(&kvp_timeout_work);
712 cancel_work_sync(&kvp_sendkey_work);
713 hvutil_transport_destroy(hvt);
714}
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#include "hyperv_vmbus.h"
32#include "hv_utils_transport.h"
33
34/*
35 * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
36 */
37#define WS2008_SRV_MAJOR 1
38#define WS2008_SRV_MINOR 0
39#define WS2008_SRV_VERSION (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR)
40
41#define WIN7_SRV_MAJOR 3
42#define WIN7_SRV_MINOR 0
43#define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
44
45#define WIN8_SRV_MAJOR 4
46#define WIN8_SRV_MINOR 0
47#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
48
49#define KVP_VER_COUNT 3
50static const int kvp_versions[] = {
51 WIN8_SRV_VERSION,
52 WIN7_SRV_VERSION,
53 WS2008_SRV_VERSION
54};
55
56#define FW_VER_COUNT 2
57static const int fw_versions[] = {
58 UTIL_FW_VERSION,
59 UTIL_WS2K8_FW_VERSION
60};
61
62/*
63 * Global state maintained for transaction that is being processed. For a class
64 * of integration services, including the "KVP service", the specified protocol
65 * is a "request/response" protocol which means that there can only be single
66 * outstanding transaction from the host at any given point in time. We use
67 * this to simplify memory management in this driver - we cache and process
68 * only one message at a time.
69 *
70 * While the request/response protocol is guaranteed by the host, we further
71 * ensure this by serializing packet processing in this driver - we do not
72 * read additional packets from the VMBUS until the current packet is fully
73 * handled.
74 */
75
76static struct {
77 int state; /* hvutil_device_state */
78 int recv_len; /* number of bytes received. */
79 struct hv_kvp_msg *kvp_msg; /* current message */
80 struct vmbus_channel *recv_channel; /* chn we got the request */
81 u64 recv_req_id; /* request ID. */
82} kvp_transaction;
83
84/*
85 * This state maintains the version number registered by the daemon.
86 */
87static int dm_reg_value;
88
89static void kvp_send_key(struct work_struct *dummy);
90
91
92static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
93static void kvp_timeout_func(struct work_struct *dummy);
94static void kvp_host_handshake_func(struct work_struct *dummy);
95static void kvp_register(int);
96
97static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func);
98static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func);
99static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
100
101static const char kvp_devname[] = "vmbus/hv_kvp";
102static u8 *recv_buffer;
103static struct hvutil_transport *hvt;
104/*
105 * Register the kernel component with the user-level daemon.
106 * As part of this registration, pass the LIC version number.
107 * This number has no meaning, it satisfies the registration protocol.
108 */
109#define HV_DRV_VERSION "3.1"
110
111static void kvp_poll_wrapper(void *channel)
112{
113 /* Transaction is finished, reset the state here to avoid races. */
114 kvp_transaction.state = HVUTIL_READY;
115 tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event);
116}
117
118static void kvp_register_done(void)
119{
120 /*
121 * If we're still negotiating with the host cancel the timeout
122 * work to not poll the channel twice.
123 */
124 pr_debug("KVP: userspace daemon registered\n");
125 cancel_delayed_work_sync(&kvp_host_handshake_work);
126 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
127}
128
129static void
130kvp_register(int reg_value)
131{
132
133 struct hv_kvp_msg *kvp_msg;
134 char *version;
135
136 kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL);
137
138 if (kvp_msg) {
139 version = kvp_msg->body.kvp_register.version;
140 kvp_msg->kvp_hdr.operation = reg_value;
141 strcpy(version, HV_DRV_VERSION);
142
143 hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg),
144 kvp_register_done);
145 kfree(kvp_msg);
146 }
147}
148
149static void kvp_timeout_func(struct work_struct *dummy)
150{
151 /*
152 * If the timer fires, the user-mode component has not responded;
153 * process the pending transaction.
154 */
155 kvp_respond_to_host(NULL, HV_E_FAIL);
156
157 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
158}
159
160static void kvp_host_handshake_func(struct work_struct *dummy)
161{
162 tasklet_schedule(&kvp_transaction.recv_channel->callback_event);
163}
164
165static int kvp_handle_handshake(struct hv_kvp_msg *msg)
166{
167 switch (msg->kvp_hdr.operation) {
168 case KVP_OP_REGISTER:
169 dm_reg_value = KVP_OP_REGISTER;
170 pr_info("KVP: IP injection functionality not available\n");
171 pr_info("KVP: Upgrade the KVP daemon\n");
172 break;
173 case KVP_OP_REGISTER1:
174 dm_reg_value = KVP_OP_REGISTER1;
175 break;
176 default:
177 pr_info("KVP: incompatible daemon\n");
178 pr_info("KVP: KVP version: %d, Daemon version: %d\n",
179 KVP_OP_REGISTER1, msg->kvp_hdr.operation);
180 return -EINVAL;
181 }
182
183 /*
184 * We have a compatible daemon; complete the handshake.
185 */
186 pr_debug("KVP: userspace daemon ver. %d connected\n",
187 msg->kvp_hdr.operation);
188 kvp_register(dm_reg_value);
189
190 return 0;
191}
192
193
194/*
195 * Callback when data is received from user mode.
196 */
197
198static int kvp_on_msg(void *msg, int len)
199{
200 struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg;
201 struct hv_kvp_msg_enumerate *data;
202 int error = 0;
203
204 if (len < sizeof(*message))
205 return -EINVAL;
206
207 /*
208 * If we are negotiating the version information
209 * with the daemon; handle that first.
210 */
211
212 if (kvp_transaction.state < HVUTIL_READY) {
213 return kvp_handle_handshake(message);
214 }
215
216 /* We didn't send anything to userspace so the reply is spurious */
217 if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
218 return -EINVAL;
219
220 kvp_transaction.state = HVUTIL_USERSPACE_RECV;
221
222 /*
223 * Based on the version of the daemon, we propagate errors from the
224 * daemon differently.
225 */
226
227 data = &message->body.kvp_enum_data;
228
229 switch (dm_reg_value) {
230 case KVP_OP_REGISTER:
231 /*
232 * Null string is used to pass back error condition.
233 */
234 if (data->data.key[0] == 0)
235 error = HV_S_CONT;
236 break;
237
238 case KVP_OP_REGISTER1:
239 /*
240 * We use the message header information from
241 * the user level daemon to transmit errors.
242 */
243 error = message->error;
244 break;
245 }
246
247 /*
248 * Complete the transaction by forwarding the key value
249 * to the host. But first, cancel the timeout.
250 */
251 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
252 kvp_respond_to_host(message, error);
253 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
254 }
255
256 return 0;
257}
258
259
260static int process_ob_ipinfo(void *in_msg, void *out_msg, int op)
261{
262 struct hv_kvp_msg *in = in_msg;
263 struct hv_kvp_ip_msg *out = out_msg;
264 int len;
265
266 switch (op) {
267 case KVP_OP_GET_IP_INFO:
268 /*
269 * Transform all parameters into utf16 encoding.
270 */
271 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr,
272 strlen((char *)in->body.kvp_ip_val.ip_addr),
273 UTF16_HOST_ENDIAN,
274 (wchar_t *)out->kvp_ip_val.ip_addr,
275 MAX_IP_ADDR_SIZE);
276 if (len < 0)
277 return len;
278
279 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net,
280 strlen((char *)in->body.kvp_ip_val.sub_net),
281 UTF16_HOST_ENDIAN,
282 (wchar_t *)out->kvp_ip_val.sub_net,
283 MAX_IP_ADDR_SIZE);
284 if (len < 0)
285 return len;
286
287 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way,
288 strlen((char *)in->body.kvp_ip_val.gate_way),
289 UTF16_HOST_ENDIAN,
290 (wchar_t *)out->kvp_ip_val.gate_way,
291 MAX_GATEWAY_SIZE);
292 if (len < 0)
293 return len;
294
295 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr,
296 strlen((char *)in->body.kvp_ip_val.dns_addr),
297 UTF16_HOST_ENDIAN,
298 (wchar_t *)out->kvp_ip_val.dns_addr,
299 MAX_IP_ADDR_SIZE);
300 if (len < 0)
301 return len;
302
303 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id,
304 strlen((char *)in->body.kvp_ip_val.adapter_id),
305 UTF16_HOST_ENDIAN,
306 (wchar_t *)out->kvp_ip_val.adapter_id,
307 MAX_ADAPTER_ID_SIZE);
308 if (len < 0)
309 return len;
310
311 out->kvp_ip_val.dhcp_enabled =
312 in->body.kvp_ip_val.dhcp_enabled;
313 out->kvp_ip_val.addr_family =
314 in->body.kvp_ip_val.addr_family;
315 }
316
317 return 0;
318}
319
320static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
321{
322 struct hv_kvp_ip_msg *in = in_msg;
323 struct hv_kvp_msg *out = out_msg;
324
325 switch (op) {
326 case KVP_OP_SET_IP_INFO:
327 /*
328 * Transform all parameters into utf8 encoding.
329 */
330 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr,
331 MAX_IP_ADDR_SIZE,
332 UTF16_LITTLE_ENDIAN,
333 (__u8 *)out->body.kvp_ip_val.ip_addr,
334 MAX_IP_ADDR_SIZE);
335
336 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net,
337 MAX_IP_ADDR_SIZE,
338 UTF16_LITTLE_ENDIAN,
339 (__u8 *)out->body.kvp_ip_val.sub_net,
340 MAX_IP_ADDR_SIZE);
341
342 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way,
343 MAX_GATEWAY_SIZE,
344 UTF16_LITTLE_ENDIAN,
345 (__u8 *)out->body.kvp_ip_val.gate_way,
346 MAX_GATEWAY_SIZE);
347
348 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr,
349 MAX_IP_ADDR_SIZE,
350 UTF16_LITTLE_ENDIAN,
351 (__u8 *)out->body.kvp_ip_val.dns_addr,
352 MAX_IP_ADDR_SIZE);
353
354 out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
355
356 default:
357 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
358 MAX_ADAPTER_ID_SIZE,
359 UTF16_LITTLE_ENDIAN,
360 (__u8 *)out->body.kvp_ip_val.adapter_id,
361 MAX_ADAPTER_ID_SIZE);
362
363 out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family;
364 }
365}
366
367
368
369
370static void
371kvp_send_key(struct work_struct *dummy)
372{
373 struct hv_kvp_msg *message;
374 struct hv_kvp_msg *in_msg;
375 __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
376 __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
377 __u32 val32;
378 __u64 val64;
379 int rc;
380
381 /* The transaction state is wrong. */
382 if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
383 return;
384
385 message = kzalloc(sizeof(*message), GFP_KERNEL);
386 if (!message)
387 return;
388
389 message->kvp_hdr.operation = operation;
390 message->kvp_hdr.pool = pool;
391 in_msg = kvp_transaction.kvp_msg;
392
393 /*
394 * The key/value strings sent from the host are encoded in
395 * in utf16; convert it to utf8 strings.
396 * The host assures us that the utf16 strings will not exceed
397 * the max lengths specified. We will however, reserve room
398 * for the string terminating character - in the utf16s_utf8s()
399 * function we limit the size of the buffer where the converted
400 * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to guarantee
401 * that the strings can be properly terminated!
402 */
403
404 switch (message->kvp_hdr.operation) {
405 case KVP_OP_SET_IP_INFO:
406 process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
407 break;
408 case KVP_OP_GET_IP_INFO:
409 process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
410 break;
411 case KVP_OP_SET:
412 switch (in_msg->body.kvp_set.data.value_type) {
413 case REG_SZ:
414 /*
415 * The value is a string - utf16 encoding.
416 */
417 message->body.kvp_set.data.value_size =
418 utf16s_to_utf8s(
419 (wchar_t *)in_msg->body.kvp_set.data.value,
420 in_msg->body.kvp_set.data.value_size,
421 UTF16_LITTLE_ENDIAN,
422 message->body.kvp_set.data.value,
423 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
424 break;
425
426 case REG_U32:
427 /*
428 * The value is a 32 bit scalar.
429 * We save this as a utf8 string.
430 */
431 val32 = in_msg->body.kvp_set.data.value_u32;
432 message->body.kvp_set.data.value_size =
433 sprintf(message->body.kvp_set.data.value,
434 "%d", val32) + 1;
435 break;
436
437 case REG_U64:
438 /*
439 * The value is a 64 bit scalar.
440 * We save this as a utf8 string.
441 */
442 val64 = in_msg->body.kvp_set.data.value_u64;
443 message->body.kvp_set.data.value_size =
444 sprintf(message->body.kvp_set.data.value,
445 "%llu", val64) + 1;
446 break;
447
448 }
449 case KVP_OP_GET:
450 message->body.kvp_set.data.key_size =
451 utf16s_to_utf8s(
452 (wchar_t *)in_msg->body.kvp_set.data.key,
453 in_msg->body.kvp_set.data.key_size,
454 UTF16_LITTLE_ENDIAN,
455 message->body.kvp_set.data.key,
456 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
457 break;
458
459 case KVP_OP_DELETE:
460 message->body.kvp_delete.key_size =
461 utf16s_to_utf8s(
462 (wchar_t *)in_msg->body.kvp_delete.key,
463 in_msg->body.kvp_delete.key_size,
464 UTF16_LITTLE_ENDIAN,
465 message->body.kvp_delete.key,
466 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
467 break;
468
469 case KVP_OP_ENUMERATE:
470 message->body.kvp_enum_data.index =
471 in_msg->body.kvp_enum_data.index;
472 break;
473 }
474
475 kvp_transaction.state = HVUTIL_USERSPACE_REQ;
476 rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL);
477 if (rc) {
478 pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
479 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
480 kvp_respond_to_host(message, HV_E_FAIL);
481 kvp_transaction.state = HVUTIL_READY;
482 }
483 }
484
485 kfree(message);
486}
487
488/*
489 * Send a response back to the host.
490 */
491
492static void
493kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error)
494{
495 struct hv_kvp_msg *kvp_msg;
496 struct hv_kvp_exchg_msg_value *kvp_data;
497 char *key_name;
498 char *value;
499 struct icmsg_hdr *icmsghdrp;
500 int keylen = 0;
501 int valuelen = 0;
502 u32 buf_len;
503 struct vmbus_channel *channel;
504 u64 req_id;
505 int ret;
506
507 /*
508 * Copy the global state for completing the transaction. Note that
509 * only one transaction can be active at a time.
510 */
511
512 buf_len = kvp_transaction.recv_len;
513 channel = kvp_transaction.recv_channel;
514 req_id = kvp_transaction.recv_req_id;
515
516 icmsghdrp = (struct icmsg_hdr *)
517 &recv_buffer[sizeof(struct vmbuspipe_hdr)];
518
519 if (channel->onchannel_callback == NULL)
520 /*
521 * We have raced with util driver being unloaded;
522 * silently return.
523 */
524 return;
525
526 icmsghdrp->status = error;
527
528 /*
529 * If the error parameter is set, terminate the host's enumeration
530 * on this pool.
531 */
532 if (error) {
533 /*
534 * Something failed or we have timed out;
535 * terminate the current host-side iteration.
536 */
537 goto response_done;
538 }
539
540 kvp_msg = (struct hv_kvp_msg *)
541 &recv_buffer[sizeof(struct vmbuspipe_hdr) +
542 sizeof(struct icmsg_hdr)];
543
544 switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
545 case KVP_OP_GET_IP_INFO:
546 ret = process_ob_ipinfo(msg_to_host,
547 (struct hv_kvp_ip_msg *)kvp_msg,
548 KVP_OP_GET_IP_INFO);
549 if (ret < 0)
550 icmsghdrp->status = HV_E_FAIL;
551
552 goto response_done;
553 case KVP_OP_SET_IP_INFO:
554 goto response_done;
555 case KVP_OP_GET:
556 kvp_data = &kvp_msg->body.kvp_get.data;
557 goto copy_value;
558
559 case KVP_OP_SET:
560 case KVP_OP_DELETE:
561 goto response_done;
562
563 default:
564 break;
565 }
566
567 kvp_data = &kvp_msg->body.kvp_enum_data.data;
568 key_name = msg_to_host->body.kvp_enum_data.data.key;
569
570 /*
571 * The windows host expects the key/value pair to be encoded
572 * in utf16. Ensure that the key/value size reported to the host
573 * will be less than or equal to the MAX size (including the
574 * terminating character).
575 */
576 keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
577 (wchar_t *) kvp_data->key,
578 (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
579 kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
580
581copy_value:
582 value = msg_to_host->body.kvp_enum_data.data.value;
583 valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
584 (wchar_t *) kvp_data->value,
585 (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
586 kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
587
588 /*
589 * If the utf8s to utf16s conversion failed; notify host
590 * of the error.
591 */
592 if ((keylen < 0) || (valuelen < 0))
593 icmsghdrp->status = HV_E_FAIL;
594
595 kvp_data->value_type = REG_SZ; /* all our values are strings */
596
597response_done:
598 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
599
600 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
601 VM_PKT_DATA_INBAND, 0);
602}
603
604/*
605 * This callback is invoked when we get a KVP message from the host.
606 * The host ensures that only one KVP transaction can be active at a time.
607 * KVP implementation in Linux needs to forward the key to a user-mde
608 * component to retrieve the corresponding value. Consequently, we cannot
609 * respond to the host in the context of this callback. Since the host
610 * guarantees that at most only one transaction can be active at a time,
611 * we stash away the transaction state in a set of global variables.
612 */
613
614void hv_kvp_onchannelcallback(void *context)
615{
616 struct vmbus_channel *channel = context;
617 u32 recvlen;
618 u64 requestid;
619
620 struct hv_kvp_msg *kvp_msg;
621
622 struct icmsg_hdr *icmsghdrp;
623 int kvp_srv_version;
624 static enum {NEGO_NOT_STARTED,
625 NEGO_IN_PROGRESS,
626 NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED;
627
628 if (kvp_transaction.state < HVUTIL_READY) {
629 /*
630 * If userspace daemon is not connected and host is asking
631 * us to negotiate we need to delay to not lose messages.
632 * This is important for Failover IP setting.
633 */
634 if (host_negotiatied == NEGO_NOT_STARTED) {
635 host_negotiatied = NEGO_IN_PROGRESS;
636 schedule_delayed_work(&kvp_host_handshake_work,
637 HV_UTIL_NEGO_TIMEOUT * HZ);
638 }
639 return;
640 }
641 if (kvp_transaction.state > HVUTIL_READY)
642 return;
643
644 vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
645 &requestid);
646
647 if (recvlen > 0) {
648 icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
649 sizeof(struct vmbuspipe_hdr)];
650
651 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
652 if (vmbus_prep_negotiate_resp(icmsghdrp,
653 recv_buffer, fw_versions, FW_VER_COUNT,
654 kvp_versions, KVP_VER_COUNT,
655 NULL, &kvp_srv_version)) {
656 pr_info("KVP IC version %d.%d\n",
657 kvp_srv_version >> 16,
658 kvp_srv_version & 0xFFFF);
659 }
660 } else {
661 kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
662 sizeof(struct vmbuspipe_hdr) +
663 sizeof(struct icmsg_hdr)];
664
665 /*
666 * Stash away this global state for completing the
667 * transaction; note transactions are serialized.
668 */
669
670 kvp_transaction.recv_len = recvlen;
671 kvp_transaction.recv_req_id = requestid;
672 kvp_transaction.kvp_msg = kvp_msg;
673
674 if (kvp_transaction.state < HVUTIL_READY) {
675 /* Userspace is not registered yet */
676 kvp_respond_to_host(NULL, HV_E_FAIL);
677 return;
678 }
679 kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
680
681 /*
682 * Get the information from the
683 * user-mode component.
684 * component. This transaction will be
685 * completed when we get the value from
686 * the user-mode component.
687 * Set a timeout to deal with
688 * user-mode not responding.
689 */
690 schedule_work(&kvp_sendkey_work);
691 schedule_delayed_work(&kvp_timeout_work,
692 HV_UTIL_TIMEOUT * HZ);
693
694 return;
695
696 }
697
698 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
699 | ICMSGHDRFLAG_RESPONSE;
700
701 vmbus_sendpacket(channel, recv_buffer,
702 recvlen, requestid,
703 VM_PKT_DATA_INBAND, 0);
704
705 host_negotiatied = NEGO_FINISHED;
706 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
707 }
708
709}
710
711static void kvp_on_reset(void)
712{
713 if (cancel_delayed_work_sync(&kvp_timeout_work))
714 kvp_respond_to_host(NULL, HV_E_FAIL);
715 kvp_transaction.state = HVUTIL_DEVICE_INIT;
716}
717
718int
719hv_kvp_init(struct hv_util_service *srv)
720{
721 recv_buffer = srv->recv_buffer;
722 kvp_transaction.recv_channel = srv->channel;
723
724 /*
725 * When this driver loads, the user level daemon that
726 * processes the host requests may not yet be running.
727 * Defer processing channel callbacks until the daemon
728 * has registered.
729 */
730 kvp_transaction.state = HVUTIL_DEVICE_INIT;
731
732 hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL,
733 kvp_on_msg, kvp_on_reset);
734 if (!hvt)
735 return -EFAULT;
736
737 return 0;
738}
739
740void hv_kvp_deinit(void)
741{
742 kvp_transaction.state = HVUTIL_DEVICE_DYING;
743 cancel_delayed_work_sync(&kvp_host_handshake_work);
744 cancel_delayed_work_sync(&kvp_timeout_work);
745 cancel_work_sync(&kvp_sendkey_work);
746 hvutil_transport_destroy(hvt);
747}