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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 | ||
63 | static 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 | */ | |
74 | static int dm_reg_value; | |
75 | ||
76 | static void kvp_send_key(struct work_struct *dummy); | |
77 | ||
78 | ||
79 | static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); | |
80 | static void kvp_timeout_func(struct work_struct *dummy); | |
81 | static void kvp_host_handshake_func(struct work_struct *dummy); | |
82 | static void kvp_register(int); | |
83 | ||
84 | static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); | |
85 | static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func); | |
86 | static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); | |
87 | ||
88 | static const char kvp_devname[] = "vmbus/hv_kvp"; | |
89 | static u8 *recv_buffer; | |
90 | static struct hvutil_transport *hvt; | |
91 | static struct completion release_event; | |
92 | /* | |
93 | * Register the kernel component with the user-level daemon. | |
94 | * As part of this registration, pass the LIC version number. | |
95 | * This number has no meaning, it satisfies the registration protocol. | |
96 | */ | |
97 | #define HV_DRV_VERSION "3.1" | |
98 | ||
99 | static void kvp_poll_wrapper(void *channel) | |
100 | { | |
101 | /* Transaction is finished, reset the state here to avoid races. */ | |
102 | kvp_transaction.state = HVUTIL_READY; | |
103 | hv_kvp_onchannelcallback(channel); | |
104 | } | |
105 | ||
106 | static void kvp_register_done(void) | |
107 | { | |
108 | /* | |
109 | * If we're still negotiating with the host cancel the timeout | |
110 | * work to not poll the channel twice. | |
111 | */ | |
112 | pr_debug("KVP: userspace daemon registered\n"); | |
113 | cancel_delayed_work_sync(&kvp_host_handshake_work); | |
114 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); | |
115 | } | |
116 | ||
117 | static void | |
118 | kvp_register(int reg_value) | |
119 | { | |
120 | ||
121 | struct hv_kvp_msg *kvp_msg; | |
122 | char *version; | |
123 | ||
124 | kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); | |
125 | ||
126 | if (kvp_msg) { | |
127 | version = kvp_msg->body.kvp_register.version; | |
128 | kvp_msg->kvp_hdr.operation = reg_value; | |
129 | strcpy(version, HV_DRV_VERSION); | |
130 | ||
131 | hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg), | |
132 | kvp_register_done); | |
133 | kfree(kvp_msg); | |
134 | } | |
135 | } | |
136 | ||
137 | static void kvp_timeout_func(struct work_struct *dummy) | |
138 | { | |
139 | /* | |
140 | * If the timer fires, the user-mode component has not responded; | |
141 | * process the pending transaction. | |
142 | */ | |
143 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
144 | ||
145 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); | |
146 | } | |
147 | ||
148 | static void kvp_host_handshake_func(struct work_struct *dummy) | |
149 | { | |
150 | hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback); | |
151 | } | |
152 | ||
153 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) | |
154 | { | |
155 | switch (msg->kvp_hdr.operation) { | |
156 | case KVP_OP_REGISTER: | |
157 | dm_reg_value = KVP_OP_REGISTER; | |
158 | pr_info("KVP: IP injection functionality not available\n"); | |
159 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
160 | break; | |
161 | case KVP_OP_REGISTER1: | |
162 | dm_reg_value = KVP_OP_REGISTER1; | |
163 | break; | |
164 | default: | |
165 | pr_info("KVP: incompatible daemon\n"); | |
166 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
167 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | /* | |
172 | * We have a compatible daemon; complete the handshake. | |
173 | */ | |
174 | pr_debug("KVP: userspace daemon ver. %d connected\n", | |
175 | msg->kvp_hdr.operation); | |
176 | kvp_register(dm_reg_value); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | ||
182 | /* | |
183 | * Callback when data is received from user mode. | |
184 | */ | |
185 | ||
186 | static int kvp_on_msg(void *msg, int len) | |
187 | { | |
188 | struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; | |
189 | struct hv_kvp_msg_enumerate *data; | |
190 | int error = 0; | |
191 | ||
192 | if (len < sizeof(*message)) | |
193 | return -EINVAL; | |
194 | ||
195 | /* | |
196 | * If we are negotiating the version information | |
197 | * with the daemon; handle that first. | |
198 | */ | |
199 | ||
200 | if (kvp_transaction.state < HVUTIL_READY) { | |
201 | return kvp_handle_handshake(message); | |
202 | } | |
203 | ||
204 | /* We didn't send anything to userspace so the reply is spurious */ | |
205 | if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) | |
206 | return -EINVAL; | |
207 | ||
208 | kvp_transaction.state = HVUTIL_USERSPACE_RECV; | |
209 | ||
210 | /* | |
211 | * Based on the version of the daemon, we propagate errors from the | |
212 | * daemon differently. | |
213 | */ | |
214 | ||
215 | data = &message->body.kvp_enum_data; | |
216 | ||
217 | switch (dm_reg_value) { | |
218 | case KVP_OP_REGISTER: | |
219 | /* | |
220 | * Null string is used to pass back error condition. | |
221 | */ | |
222 | if (data->data.key[0] == 0) | |
223 | error = HV_S_CONT; | |
224 | break; | |
225 | ||
226 | case KVP_OP_REGISTER1: | |
227 | /* | |
228 | * We use the message header information from | |
229 | * the user level daemon to transmit errors. | |
230 | */ | |
231 | error = message->error; | |
232 | break; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Complete the transaction by forwarding the key value | |
237 | * to the host. But first, cancel the timeout. | |
238 | */ | |
239 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { | |
240 | kvp_respond_to_host(message, error); | |
241 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); | |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | ||
248 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
249 | { | |
250 | struct hv_kvp_msg *in = in_msg; | |
251 | struct hv_kvp_ip_msg *out = out_msg; | |
252 | int len; | |
253 | ||
254 | switch (op) { | |
255 | case KVP_OP_GET_IP_INFO: | |
256 | /* | |
257 | * Transform all parameters into utf16 encoding. | |
258 | */ | |
259 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
260 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
261 | UTF16_HOST_ENDIAN, | |
262 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
263 | MAX_IP_ADDR_SIZE); | |
264 | if (len < 0) | |
265 | return len; | |
266 | ||
267 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
268 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
269 | UTF16_HOST_ENDIAN, | |
270 | (wchar_t *)out->kvp_ip_val.sub_net, | |
271 | MAX_IP_ADDR_SIZE); | |
272 | if (len < 0) | |
273 | return len; | |
274 | ||
275 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
276 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
277 | UTF16_HOST_ENDIAN, | |
278 | (wchar_t *)out->kvp_ip_val.gate_way, | |
279 | MAX_GATEWAY_SIZE); | |
280 | if (len < 0) | |
281 | return len; | |
282 | ||
283 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
284 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
285 | UTF16_HOST_ENDIAN, | |
286 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
287 | MAX_IP_ADDR_SIZE); | |
288 | if (len < 0) | |
289 | return len; | |
290 | ||
291 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
292 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
293 | UTF16_HOST_ENDIAN, | |
294 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
295 | MAX_IP_ADDR_SIZE); | |
296 | if (len < 0) | |
297 | return len; | |
298 | ||
299 | out->kvp_ip_val.dhcp_enabled = | |
300 | in->body.kvp_ip_val.dhcp_enabled; | |
301 | out->kvp_ip_val.addr_family = | |
302 | in->body.kvp_ip_val.addr_family; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
309 | { | |
310 | struct hv_kvp_ip_msg *in = in_msg; | |
311 | struct hv_kvp_msg *out = out_msg; | |
312 | ||
313 | switch (op) { | |
314 | case KVP_OP_SET_IP_INFO: | |
315 | /* | |
316 | * Transform all parameters into utf8 encoding. | |
317 | */ | |
318 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
319 | MAX_IP_ADDR_SIZE, | |
320 | UTF16_LITTLE_ENDIAN, | |
321 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
322 | MAX_IP_ADDR_SIZE); | |
323 | ||
324 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
325 | MAX_IP_ADDR_SIZE, | |
326 | UTF16_LITTLE_ENDIAN, | |
327 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
328 | MAX_IP_ADDR_SIZE); | |
329 | ||
330 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
331 | MAX_GATEWAY_SIZE, | |
332 | UTF16_LITTLE_ENDIAN, | |
333 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
334 | MAX_GATEWAY_SIZE); | |
335 | ||
336 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
337 | MAX_IP_ADDR_SIZE, | |
338 | UTF16_LITTLE_ENDIAN, | |
339 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
340 | MAX_IP_ADDR_SIZE); | |
341 | ||
342 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
343 | ||
344 | default: | |
345 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
346 | MAX_ADAPTER_ID_SIZE, | |
347 | UTF16_LITTLE_ENDIAN, | |
348 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
349 | MAX_ADAPTER_ID_SIZE); | |
350 | ||
351 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
352 | } | |
353 | } | |
354 | ||
355 | ||
356 | ||
357 | ||
358 | static void | |
359 | kvp_send_key(struct work_struct *dummy) | |
360 | { | |
361 | struct hv_kvp_msg *message; | |
362 | struct hv_kvp_msg *in_msg; | |
363 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
364 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
365 | __u32 val32; | |
366 | __u64 val64; | |
367 | int rc; | |
368 | ||
369 | /* The transaction state is wrong. */ | |
370 | if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) | |
371 | return; | |
372 | ||
373 | message = kzalloc(sizeof(*message), GFP_KERNEL); | |
374 | if (!message) | |
375 | return; | |
376 | ||
377 | message->kvp_hdr.operation = operation; | |
378 | message->kvp_hdr.pool = pool; | |
379 | in_msg = kvp_transaction.kvp_msg; | |
380 | ||
381 | /* | |
382 | * The key/value strings sent from the host are encoded in | |
383 | * in utf16; convert it to utf8 strings. | |
384 | * The host assures us that the utf16 strings will not exceed | |
385 | * the max lengths specified. We will however, reserve room | |
386 | * for the string terminating character - in the utf16s_utf8s() | |
387 | * function we limit the size of the buffer where the converted | |
388 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
389 | * that the strings can be properly terminated! | |
390 | */ | |
391 | ||
392 | switch (message->kvp_hdr.operation) { | |
393 | case KVP_OP_SET_IP_INFO: | |
394 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
395 | break; | |
396 | case KVP_OP_GET_IP_INFO: | |
397 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
398 | break; | |
399 | case KVP_OP_SET: | |
400 | switch (in_msg->body.kvp_set.data.value_type) { | |
401 | case REG_SZ: | |
402 | /* | |
403 | * The value is a string - utf16 encoding. | |
404 | */ | |
405 | message->body.kvp_set.data.value_size = | |
406 | utf16s_to_utf8s( | |
407 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
408 | in_msg->body.kvp_set.data.value_size, | |
409 | UTF16_LITTLE_ENDIAN, | |
410 | message->body.kvp_set.data.value, | |
411 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
412 | break; | |
413 | ||
414 | case REG_U32: | |
415 | /* | |
416 | * The value is a 32 bit scalar. | |
417 | * We save this as a utf8 string. | |
418 | */ | |
419 | val32 = in_msg->body.kvp_set.data.value_u32; | |
420 | message->body.kvp_set.data.value_size = | |
421 | sprintf(message->body.kvp_set.data.value, | |
422 | "%d", val32) + 1; | |
423 | break; | |
424 | ||
425 | case REG_U64: | |
426 | /* | |
427 | * The value is a 64 bit scalar. | |
428 | * We save this as a utf8 string. | |
429 | */ | |
430 | val64 = in_msg->body.kvp_set.data.value_u64; | |
431 | message->body.kvp_set.data.value_size = | |
432 | sprintf(message->body.kvp_set.data.value, | |
433 | "%llu", val64) + 1; | |
434 | break; | |
435 | ||
436 | } | |
437 | case KVP_OP_GET: | |
438 | message->body.kvp_set.data.key_size = | |
439 | utf16s_to_utf8s( | |
440 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
441 | in_msg->body.kvp_set.data.key_size, | |
442 | UTF16_LITTLE_ENDIAN, | |
443 | message->body.kvp_set.data.key, | |
444 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
445 | break; | |
446 | ||
447 | case KVP_OP_DELETE: | |
448 | message->body.kvp_delete.key_size = | |
449 | utf16s_to_utf8s( | |
450 | (wchar_t *)in_msg->body.kvp_delete.key, | |
451 | in_msg->body.kvp_delete.key_size, | |
452 | UTF16_LITTLE_ENDIAN, | |
453 | message->body.kvp_delete.key, | |
454 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
455 | break; | |
456 | ||
457 | case KVP_OP_ENUMERATE: | |
458 | message->body.kvp_enum_data.index = | |
459 | in_msg->body.kvp_enum_data.index; | |
460 | break; | |
461 | } | |
462 | ||
463 | kvp_transaction.state = HVUTIL_USERSPACE_REQ; | |
464 | rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL); | |
465 | if (rc) { | |
466 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
467 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { | |
468 | kvp_respond_to_host(message, HV_E_FAIL); | |
469 | kvp_transaction.state = HVUTIL_READY; | |
470 | } | |
471 | } | |
472 | ||
473 | kfree(message); | |
474 | ||
475 | return; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Send a response back to the host. | |
480 | */ | |
481 | ||
482 | static void | |
483 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) | |
484 | { | |
485 | struct hv_kvp_msg *kvp_msg; | |
486 | struct hv_kvp_exchg_msg_value *kvp_data; | |
487 | char *key_name; | |
488 | char *value; | |
489 | struct icmsg_hdr *icmsghdrp; | |
490 | int keylen = 0; | |
491 | int valuelen = 0; | |
492 | u32 buf_len; | |
493 | struct vmbus_channel *channel; | |
494 | u64 req_id; | |
495 | int ret; | |
496 | ||
497 | /* | |
498 | * Copy the global state for completing the transaction. Note that | |
499 | * only one transaction can be active at a time. | |
500 | */ | |
501 | ||
502 | buf_len = kvp_transaction.recv_len; | |
503 | channel = kvp_transaction.recv_channel; | |
504 | req_id = kvp_transaction.recv_req_id; | |
505 | ||
506 | icmsghdrp = (struct icmsg_hdr *) | |
507 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
508 | ||
509 | if (channel->onchannel_callback == NULL) | |
510 | /* | |
511 | * We have raced with util driver being unloaded; | |
512 | * silently return. | |
513 | */ | |
514 | return; | |
515 | ||
516 | icmsghdrp->status = error; | |
517 | ||
518 | /* | |
519 | * If the error parameter is set, terminate the host's enumeration | |
520 | * on this pool. | |
521 | */ | |
522 | if (error) { | |
523 | /* | |
524 | * Something failed or we have timedout; | |
525 | * terminate the current host-side iteration. | |
526 | */ | |
527 | goto response_done; | |
528 | } | |
529 | ||
530 | kvp_msg = (struct hv_kvp_msg *) | |
531 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
532 | sizeof(struct icmsg_hdr)]; | |
533 | ||
534 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
535 | case KVP_OP_GET_IP_INFO: | |
536 | ret = process_ob_ipinfo(msg_to_host, | |
537 | (struct hv_kvp_ip_msg *)kvp_msg, | |
538 | KVP_OP_GET_IP_INFO); | |
539 | if (ret < 0) | |
540 | icmsghdrp->status = HV_E_FAIL; | |
541 | ||
542 | goto response_done; | |
543 | case KVP_OP_SET_IP_INFO: | |
544 | goto response_done; | |
545 | case KVP_OP_GET: | |
546 | kvp_data = &kvp_msg->body.kvp_get.data; | |
547 | goto copy_value; | |
548 | ||
549 | case KVP_OP_SET: | |
550 | case KVP_OP_DELETE: | |
551 | goto response_done; | |
552 | ||
553 | default: | |
554 | break; | |
555 | } | |
556 | ||
557 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
558 | key_name = msg_to_host->body.kvp_enum_data.data.key; | |
559 | ||
560 | /* | |
561 | * The windows host expects the key/value pair to be encoded | |
562 | * in utf16. Ensure that the key/value size reported to the host | |
563 | * will be less than or equal to the MAX size (including the | |
564 | * terminating character). | |
565 | */ | |
566 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, | |
567 | (wchar_t *) kvp_data->key, | |
568 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
569 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
570 | ||
571 | copy_value: | |
572 | value = msg_to_host->body.kvp_enum_data.data.value; | |
573 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, | |
574 | (wchar_t *) kvp_data->value, | |
575 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
576 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
577 | ||
578 | /* | |
579 | * If the utf8s to utf16s conversion failed; notify host | |
580 | * of the error. | |
581 | */ | |
582 | if ((keylen < 0) || (valuelen < 0)) | |
583 | icmsghdrp->status = HV_E_FAIL; | |
584 | ||
585 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
586 | ||
587 | response_done: | |
588 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
589 | ||
590 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
591 | VM_PKT_DATA_INBAND, 0); | |
592 | } | |
593 | ||
594 | /* | |
595 | * This callback is invoked when we get a KVP message from the host. | |
596 | * The host ensures that only one KVP transaction can be active at a time. | |
597 | * KVP implementation in Linux needs to forward the key to a user-mde | |
598 | * component to retrive the corresponding value. Consequently, we cannot | |
599 | * respond to the host in the conext of this callback. Since the host | |
600 | * guarantees that at most only one transaction can be active at a time, | |
601 | * we stash away the transaction state in a set of global variables. | |
602 | */ | |
603 | ||
604 | void hv_kvp_onchannelcallback(void *context) | |
605 | { | |
606 | struct vmbus_channel *channel = context; | |
607 | u32 recvlen; | |
608 | u64 requestid; | |
609 | ||
610 | struct hv_kvp_msg *kvp_msg; | |
611 | ||
612 | struct icmsg_hdr *icmsghdrp; | |
613 | struct icmsg_negotiate *negop = NULL; | |
614 | int util_fw_version; | |
615 | int kvp_srv_version; | |
616 | static enum {NEGO_NOT_STARTED, | |
617 | NEGO_IN_PROGRESS, | |
618 | NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; | |
619 | ||
620 | if (host_negotiatied == NEGO_NOT_STARTED && | |
621 | kvp_transaction.state < HVUTIL_READY) { | |
622 | /* | |
623 | * If userspace daemon is not connected and host is asking | |
624 | * us to negotiate we need to delay to not lose messages. | |
625 | * This is important for Failover IP setting. | |
626 | */ | |
627 | host_negotiatied = NEGO_IN_PROGRESS; | |
628 | schedule_delayed_work(&kvp_host_handshake_work, | |
629 | HV_UTIL_NEGO_TIMEOUT * HZ); | |
630 | return; | |
631 | } | |
632 | if (kvp_transaction.state > HVUTIL_READY) | |
633 | return; | |
634 | ||
635 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, | |
636 | &requestid); | |
637 | ||
638 | if (recvlen > 0) { | |
639 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ | |
640 | sizeof(struct vmbuspipe_hdr)]; | |
641 | ||
642 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
643 | /* | |
644 | * Based on the host, select appropriate | |
645 | * framework and service versions we will | |
646 | * negotiate. | |
647 | */ | |
648 | switch (vmbus_proto_version) { | |
649 | case (VERSION_WS2008): | |
650 | util_fw_version = UTIL_WS2K8_FW_VERSION; | |
651 | kvp_srv_version = WS2008_SRV_VERSION; | |
652 | break; | |
653 | case (VERSION_WIN7): | |
654 | util_fw_version = UTIL_FW_VERSION; | |
655 | kvp_srv_version = WIN7_SRV_VERSION; | |
656 | break; | |
657 | default: | |
658 | util_fw_version = UTIL_FW_VERSION; | |
659 | kvp_srv_version = WIN8_SRV_VERSION; | |
660 | } | |
661 | vmbus_prep_negotiate_resp(icmsghdrp, negop, | |
662 | recv_buffer, util_fw_version, | |
663 | kvp_srv_version); | |
664 | ||
665 | } else { | |
666 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
667 | sizeof(struct vmbuspipe_hdr) + | |
668 | sizeof(struct icmsg_hdr)]; | |
669 | ||
670 | /* | |
671 | * Stash away this global state for completing the | |
672 | * transaction; note transactions are serialized. | |
673 | */ | |
674 | ||
675 | kvp_transaction.recv_len = recvlen; | |
676 | kvp_transaction.recv_req_id = requestid; | |
677 | kvp_transaction.kvp_msg = kvp_msg; | |
678 | ||
679 | if (kvp_transaction.state < HVUTIL_READY) { | |
680 | /* Userspace is not registered yet */ | |
681 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
682 | return; | |
683 | } | |
684 | kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
685 | ||
686 | /* | |
687 | * Get the information from the | |
688 | * user-mode component. | |
689 | * component. This transaction will be | |
690 | * completed when we get the value from | |
691 | * the user-mode component. | |
692 | * Set a timeout to deal with | |
693 | * user-mode not responding. | |
694 | */ | |
695 | schedule_work(&kvp_sendkey_work); | |
696 | schedule_delayed_work(&kvp_timeout_work, | |
697 | HV_UTIL_TIMEOUT * HZ); | |
698 | ||
699 | return; | |
700 | ||
701 | } | |
702 | ||
703 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
704 | | ICMSGHDRFLAG_RESPONSE; | |
705 | ||
706 | vmbus_sendpacket(channel, recv_buffer, | |
707 | recvlen, requestid, | |
708 | VM_PKT_DATA_INBAND, 0); | |
709 | ||
710 | host_negotiatied = NEGO_FINISHED; | |
711 | } | |
712 | ||
713 | } | |
714 | ||
715 | static void kvp_on_reset(void) | |
716 | { | |
717 | if (cancel_delayed_work_sync(&kvp_timeout_work)) | |
718 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
719 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
720 | complete(&release_event); | |
721 | } | |
722 | ||
723 | int | |
724 | hv_kvp_init(struct hv_util_service *srv) | |
725 | { | |
726 | recv_buffer = srv->recv_buffer; | |
727 | kvp_transaction.recv_channel = srv->channel; | |
728 | ||
729 | init_completion(&release_event); | |
730 | /* | |
731 | * When this driver loads, the user level daemon that | |
732 | * processes the host requests may not yet be running. | |
733 | * Defer processing channel callbacks until the daemon | |
734 | * has registered. | |
735 | */ | |
736 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
737 | ||
738 | hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, | |
739 | kvp_on_msg, kvp_on_reset); | |
740 | if (!hvt) | |
741 | return -EFAULT; | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | void hv_kvp_deinit(void) | |
747 | { | |
748 | kvp_transaction.state = HVUTIL_DEVICE_DYING; | |
749 | cancel_delayed_work_sync(&kvp_host_handshake_work); | |
750 | cancel_delayed_work_sync(&kvp_timeout_work); | |
751 | cancel_work_sync(&kvp_sendkey_work); | |
752 | hvutil_transport_destroy(hvt); | |
753 | wait_for_completion(&release_event); | |
754 | } |