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245ba56a KS |
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 | */ | |
af7a5b6e | 23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
245ba56a KS |
24 | |
25 | #include <linux/net.h> | |
26 | #include <linux/nls.h> | |
27 | #include <linux/connector.h> | |
28 | #include <linux/workqueue.h> | |
46a97191 | 29 | #include <linux/hyperv.h> |
245ba56a | 30 | |
245ba56a | 31 | |
6741335b S |
32 | /* |
33 | * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7) | |
34 | */ | |
3a491605 S |
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 | ||
6741335b S |
39 | #define WIN7_SRV_MAJOR 3 |
40 | #define WIN7_SRV_MINOR 0 | |
3a491605 | 41 | #define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR) |
6741335b S |
42 | |
43 | #define WIN8_SRV_MAJOR 4 | |
44 | #define WIN8_SRV_MINOR 0 | |
3a491605 | 45 | #define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) |
245ba56a KS |
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. */ | |
fa3d5b85 | 59 | struct hv_kvp_msg *kvp_msg; /* current message */ |
245ba56a KS |
60 | struct vmbus_channel *recv_channel; /* chn we got the request */ |
61 | u64 recv_req_id; /* request ID. */ | |
fa3d5b85 | 62 | void *kvp_context; /* for the channel callback */ |
245ba56a KS |
63 | } kvp_transaction; |
64 | ||
b47a81dc S |
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 | ||
e2bb6537 | 77 | static void kvp_send_key(struct work_struct *dummy); |
245ba56a | 78 | |
76e5f813 | 79 | |
03db7724 | 80 | static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); |
245ba56a | 81 | static void kvp_work_func(struct work_struct *dummy); |
b47a81dc | 82 | static void kvp_register(int); |
245ba56a KS |
83 | |
84 | static DECLARE_DELAYED_WORK(kvp_work, kvp_work_func); | |
e2bb6537 | 85 | static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); |
245ba56a KS |
86 | |
87 | static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL }; | |
88 | static const char kvp_name[] = "kvp_kernel_module"; | |
245ba56a KS |
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. | |
cfc25993 | 93 | * This number has no meaning, it satisfies the registration protocol. |
245ba56a | 94 | */ |
cfc25993 | 95 | #define HV_DRV_VERSION "3.1" |
245ba56a KS |
96 | |
97 | static void | |
b47a81dc | 98 | kvp_register(int reg_value) |
245ba56a KS |
99 | { |
100 | ||
101 | struct cn_msg *msg; | |
26403354 S |
102 | struct hv_kvp_msg *kvp_msg; |
103 | char *version; | |
245ba56a | 104 | |
26403354 | 105 | msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg), GFP_ATOMIC); |
245ba56a KS |
106 | |
107 | if (msg) { | |
26403354 | 108 | kvp_msg = (struct hv_kvp_msg *)msg->data; |
e485ceac | 109 | version = kvp_msg->body.kvp_register.version; |
245ba56a KS |
110 | msg->id.idx = CN_KVP_IDX; |
111 | msg->id.val = CN_KVP_VAL; | |
26403354 | 112 | |
b47a81dc | 113 | kvp_msg->kvp_hdr.operation = reg_value; |
26403354 S |
114 | strcpy(version, HV_DRV_VERSION); |
115 | msg->len = sizeof(struct hv_kvp_msg); | |
ac8f7330 | 116 | cn_netlink_send(msg, 0, 0, GFP_ATOMIC); |
245ba56a KS |
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 | */ | |
03db7724 | 127 | kvp_respond_to_host(NULL, HV_E_FAIL); |
b47a81dc S |
128 | } |
129 | ||
130 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) | |
131 | { | |
132 | int ret = 1; | |
133 | ||
134 | switch (msg->kvp_hdr.operation) { | |
135 | case KVP_OP_REGISTER: | |
136 | dm_reg_value = KVP_OP_REGISTER; | |
137 | pr_info("KVP: IP injection functionality not available\n"); | |
138 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
139 | break; | |
140 | case KVP_OP_REGISTER1: | |
141 | dm_reg_value = KVP_OP_REGISTER1; | |
142 | break; | |
143 | default: | |
144 | pr_info("KVP: incompatible daemon\n"); | |
145 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
146 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
147 | ret = 0; | |
148 | } | |
149 | ||
150 | if (ret) { | |
151 | /* | |
152 | * We have a compatible daemon; complete the handshake. | |
153 | */ | |
154 | pr_info("KVP: user-mode registering done.\n"); | |
155 | kvp_register(dm_reg_value); | |
156 | kvp_transaction.active = false; | |
157 | if (kvp_transaction.kvp_context) | |
158 | hv_kvp_onchannelcallback(kvp_transaction.kvp_context); | |
159 | } | |
160 | return ret; | |
245ba56a KS |
161 | } |
162 | ||
b47a81dc | 163 | |
245ba56a KS |
164 | /* |
165 | * Callback when data is received from user mode. | |
166 | */ | |
167 | ||
168 | static void | |
169 | kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) | |
170 | { | |
26403354 S |
171 | struct hv_kvp_msg *message; |
172 | struct hv_kvp_msg_enumerate *data; | |
b47a81dc | 173 | int error = 0; |
245ba56a | 174 | |
26403354 | 175 | message = (struct hv_kvp_msg *)msg->data; |
b47a81dc S |
176 | |
177 | /* | |
178 | * If we are negotiating the version information | |
179 | * with the daemon; handle that first. | |
180 | */ | |
181 | ||
182 | if (in_hand_shake) { | |
183 | if (kvp_handle_handshake(message)) | |
184 | in_hand_shake = false; | |
185 | return; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Based on the version of the daemon, we propagate errors from the | |
190 | * daemon differently. | |
191 | */ | |
192 | ||
193 | data = &message->body.kvp_enum_data; | |
194 | ||
195 | switch (dm_reg_value) { | |
fa3d5b85 | 196 | case KVP_OP_REGISTER: |
b47a81dc S |
197 | /* |
198 | * Null string is used to pass back error condition. | |
199 | */ | |
200 | if (data->data.key[0] == 0) | |
201 | error = HV_S_CONT; | |
fa3d5b85 | 202 | break; |
245ba56a | 203 | |
b47a81dc | 204 | case KVP_OP_REGISTER1: |
245ba56a | 205 | /* |
b47a81dc S |
206 | * We use the message header information from |
207 | * the user level daemon to transmit errors. | |
245ba56a | 208 | */ |
b47a81dc S |
209 | error = message->error; |
210 | break; | |
245ba56a | 211 | } |
b47a81dc S |
212 | |
213 | /* | |
214 | * Complete the transaction by forwarding the key value | |
215 | * to the host. But first, cancel the timeout. | |
216 | */ | |
217 | if (cancel_delayed_work_sync(&kvp_work)) | |
03db7724 | 218 | kvp_respond_to_host(message, error); |
245ba56a KS |
219 | } |
220 | ||
03db7724 S |
221 | |
222 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
223 | { | |
224 | struct hv_kvp_msg *in = in_msg; | |
225 | struct hv_kvp_ip_msg *out = out_msg; | |
226 | int len; | |
227 | ||
228 | switch (op) { | |
229 | case KVP_OP_GET_IP_INFO: | |
230 | /* | |
231 | * Transform all parameters into utf16 encoding. | |
232 | */ | |
233 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
234 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
235 | UTF16_HOST_ENDIAN, | |
236 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
237 | MAX_IP_ADDR_SIZE); | |
238 | if (len < 0) | |
239 | return len; | |
240 | ||
241 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
242 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
243 | UTF16_HOST_ENDIAN, | |
244 | (wchar_t *)out->kvp_ip_val.sub_net, | |
245 | MAX_IP_ADDR_SIZE); | |
246 | if (len < 0) | |
247 | return len; | |
248 | ||
249 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
250 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
251 | UTF16_HOST_ENDIAN, | |
252 | (wchar_t *)out->kvp_ip_val.gate_way, | |
253 | MAX_GATEWAY_SIZE); | |
254 | if (len < 0) | |
255 | return len; | |
256 | ||
257 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
258 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
259 | UTF16_HOST_ENDIAN, | |
260 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
261 | MAX_IP_ADDR_SIZE); | |
262 | if (len < 0) | |
263 | return len; | |
264 | ||
265 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
266 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
267 | UTF16_HOST_ENDIAN, | |
268 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
269 | MAX_IP_ADDR_SIZE); | |
270 | if (len < 0) | |
271 | return len; | |
272 | ||
273 | out->kvp_ip_val.dhcp_enabled = | |
274 | in->body.kvp_ip_val.dhcp_enabled; | |
a500e0e7 S |
275 | out->kvp_ip_val.addr_family = |
276 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
277 | } |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
283 | { | |
284 | struct hv_kvp_ip_msg *in = in_msg; | |
285 | struct hv_kvp_msg *out = out_msg; | |
286 | ||
287 | switch (op) { | |
288 | case KVP_OP_SET_IP_INFO: | |
289 | /* | |
290 | * Transform all parameters into utf8 encoding. | |
291 | */ | |
292 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
293 | MAX_IP_ADDR_SIZE, | |
294 | UTF16_LITTLE_ENDIAN, | |
295 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
296 | MAX_IP_ADDR_SIZE); | |
297 | ||
298 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
299 | MAX_IP_ADDR_SIZE, | |
300 | UTF16_LITTLE_ENDIAN, | |
301 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
302 | MAX_IP_ADDR_SIZE); | |
303 | ||
304 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
305 | MAX_GATEWAY_SIZE, | |
306 | UTF16_LITTLE_ENDIAN, | |
307 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
308 | MAX_GATEWAY_SIZE); | |
309 | ||
310 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
311 | MAX_IP_ADDR_SIZE, | |
312 | UTF16_LITTLE_ENDIAN, | |
313 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
314 | MAX_IP_ADDR_SIZE); | |
315 | ||
316 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
317 | ||
318 | default: | |
319 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
320 | MAX_ADAPTER_ID_SIZE, | |
321 | UTF16_LITTLE_ENDIAN, | |
322 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
323 | MAX_ADAPTER_ID_SIZE); | |
324 | ||
325 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
326 | } | |
327 | } | |
328 | ||
329 | ||
330 | ||
331 | ||
e2bb6537 S |
332 | static void |
333 | kvp_send_key(struct work_struct *dummy) | |
245ba56a KS |
334 | { |
335 | struct cn_msg *msg; | |
26403354 | 336 | struct hv_kvp_msg *message; |
fa3d5b85 S |
337 | struct hv_kvp_msg *in_msg; |
338 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
339 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
340 | __u32 val32; | |
341 | __u64 val64; | |
245ba56a KS |
342 | |
343 | msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC); | |
fa3d5b85 S |
344 | if (!msg) |
345 | return; | |
245ba56a | 346 | |
fa3d5b85 S |
347 | msg->id.idx = CN_KVP_IDX; |
348 | msg->id.val = CN_KVP_VAL; | |
26403354 | 349 | |
fa3d5b85 S |
350 | message = (struct hv_kvp_msg *)msg->data; |
351 | message->kvp_hdr.operation = operation; | |
352 | message->kvp_hdr.pool = pool; | |
353 | in_msg = kvp_transaction.kvp_msg; | |
354 | ||
355 | /* | |
356 | * The key/value strings sent from the host are encoded in | |
357 | * in utf16; convert it to utf8 strings. | |
358 | * The host assures us that the utf16 strings will not exceed | |
359 | * the max lengths specified. We will however, reserve room | |
360 | * for the string terminating character - in the utf16s_utf8s() | |
361 | * function we limit the size of the buffer where the converted | |
362 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
363 | * that the strings can be properly terminated! | |
364 | */ | |
365 | ||
366 | switch (message->kvp_hdr.operation) { | |
03db7724 S |
367 | case KVP_OP_SET_IP_INFO: |
368 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
369 | break; | |
370 | case KVP_OP_GET_IP_INFO: | |
371 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
372 | break; | |
fa3d5b85 S |
373 | case KVP_OP_SET: |
374 | switch (in_msg->body.kvp_set.data.value_type) { | |
375 | case REG_SZ: | |
376 | /* | |
377 | * The value is a string - utf16 encoding. | |
378 | */ | |
379 | message->body.kvp_set.data.value_size = | |
380 | utf16s_to_utf8s( | |
381 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
382 | in_msg->body.kvp_set.data.value_size, | |
383 | UTF16_LITTLE_ENDIAN, | |
384 | message->body.kvp_set.data.value, | |
385 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
386 | break; | |
387 | ||
388 | case REG_U32: | |
389 | /* | |
390 | * The value is a 32 bit scalar. | |
391 | * We save this as a utf8 string. | |
392 | */ | |
393 | val32 = in_msg->body.kvp_set.data.value_u32; | |
394 | message->body.kvp_set.data.value_size = | |
395 | sprintf(message->body.kvp_set.data.value, | |
396 | "%d", val32) + 1; | |
397 | break; | |
398 | ||
399 | case REG_U64: | |
400 | /* | |
401 | * The value is a 64 bit scalar. | |
402 | * We save this as a utf8 string. | |
403 | */ | |
404 | val64 = in_msg->body.kvp_set.data.value_u64; | |
405 | message->body.kvp_set.data.value_size = | |
406 | sprintf(message->body.kvp_set.data.value, | |
407 | "%llu", val64) + 1; | |
408 | break; | |
409 | ||
410 | } | |
411 | case KVP_OP_GET: | |
412 | message->body.kvp_set.data.key_size = | |
413 | utf16s_to_utf8s( | |
414 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
415 | in_msg->body.kvp_set.data.key_size, | |
416 | UTF16_LITTLE_ENDIAN, | |
417 | message->body.kvp_set.data.key, | |
418 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
419 | break; | |
420 | ||
421 | case KVP_OP_DELETE: | |
422 | message->body.kvp_delete.key_size = | |
423 | utf16s_to_utf8s( | |
424 | (wchar_t *)in_msg->body.kvp_delete.key, | |
425 | in_msg->body.kvp_delete.key_size, | |
426 | UTF16_LITTLE_ENDIAN, | |
427 | message->body.kvp_delete.key, | |
428 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
429 | break; | |
430 | ||
431 | case KVP_OP_ENUMERATE: | |
432 | message->body.kvp_enum_data.index = | |
433 | in_msg->body.kvp_enum_data.index; | |
434 | break; | |
245ba56a | 435 | } |
fa3d5b85 S |
436 | |
437 | msg->len = sizeof(struct hv_kvp_msg); | |
ac8f7330 | 438 | cn_netlink_send(msg, 0, 0, GFP_ATOMIC); |
fa3d5b85 S |
439 | kfree(msg); |
440 | ||
e2bb6537 | 441 | return; |
245ba56a KS |
442 | } |
443 | ||
444 | /* | |
445 | * Send a response back to the host. | |
446 | */ | |
447 | ||
448 | static void | |
03db7724 | 449 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
450 | { |
451 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 452 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 453 | char *key_name; |
03db7724 | 454 | char *value; |
245ba56a | 455 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
456 | int keylen = 0; |
457 | int valuelen = 0; | |
245ba56a KS |
458 | u32 buf_len; |
459 | struct vmbus_channel *channel; | |
460 | u64 req_id; | |
03db7724 | 461 | int ret; |
245ba56a KS |
462 | |
463 | /* | |
464 | * If a transaction is not active; log and return. | |
465 | */ | |
466 | ||
467 | if (!kvp_transaction.active) { | |
468 | /* | |
469 | * This is a spurious call! | |
470 | */ | |
af7a5b6e | 471 | pr_warn("KVP: Transaction not active\n"); |
245ba56a KS |
472 | return; |
473 | } | |
474 | /* | |
475 | * Copy the global state for completing the transaction. Note that | |
476 | * only one transaction can be active at a time. | |
477 | */ | |
478 | ||
479 | buf_len = kvp_transaction.recv_len; | |
480 | channel = kvp_transaction.recv_channel; | |
481 | req_id = kvp_transaction.recv_req_id; | |
482 | ||
76e5f813 S |
483 | kvp_transaction.active = false; |
484 | ||
fa3d5b85 S |
485 | icmsghdrp = (struct icmsg_hdr *) |
486 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
487 | ||
4e65f6e8 S |
488 | if (channel->onchannel_callback == NULL) |
489 | /* | |
490 | * We have raced with util driver being unloaded; | |
491 | * silently return. | |
492 | */ | |
493 | return; | |
494 | ||
b47a81dc | 495 | icmsghdrp->status = error; |
245ba56a KS |
496 | |
497 | /* | |
adc80ae6 S |
498 | * If the error parameter is set, terminate the host's enumeration |
499 | * on this pool. | |
245ba56a KS |
500 | */ |
501 | if (error) { | |
502 | /* | |
b47a81dc S |
503 | * Something failed or we have timedout; |
504 | * terminate the current host-side iteration. | |
245ba56a | 505 | */ |
245ba56a KS |
506 | goto response_done; |
507 | } | |
508 | ||
fa3d5b85 S |
509 | kvp_msg = (struct hv_kvp_msg *) |
510 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
511 | sizeof(struct icmsg_hdr)]; | |
512 | ||
513 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
03db7724 S |
514 | case KVP_OP_GET_IP_INFO: |
515 | ret = process_ob_ipinfo(msg_to_host, | |
516 | (struct hv_kvp_ip_msg *)kvp_msg, | |
517 | KVP_OP_GET_IP_INFO); | |
518 | if (ret < 0) | |
519 | icmsghdrp->status = HV_E_FAIL; | |
520 | ||
521 | goto response_done; | |
522 | case KVP_OP_SET_IP_INFO: | |
523 | goto response_done; | |
fa3d5b85 S |
524 | case KVP_OP_GET: |
525 | kvp_data = &kvp_msg->body.kvp_get.data; | |
526 | goto copy_value; | |
527 | ||
528 | case KVP_OP_SET: | |
529 | case KVP_OP_DELETE: | |
530 | goto response_done; | |
531 | ||
532 | default: | |
533 | break; | |
534 | } | |
535 | ||
536 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
03db7724 | 537 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 538 | |
245ba56a KS |
539 | /* |
540 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
541 | * in utf16. Ensure that the key/value size reported to the host |
542 | * will be less than or equal to the MAX size (including the | |
543 | * terminating character). | |
245ba56a | 544 | */ |
0720a06a | 545 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
546 | (wchar_t *) kvp_data->key, |
547 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
548 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
549 | ||
550 | copy_value: | |
03db7724 | 551 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 552 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
553 | (wchar_t *) kvp_data->value, |
554 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
555 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
245ba56a | 556 | |
fa3d5b85 S |
557 | /* |
558 | * If the utf8s to utf16s conversion failed; notify host | |
559 | * of the error. | |
560 | */ | |
561 | if ((keylen < 0) || (valuelen < 0)) | |
562 | icmsghdrp->status = HV_E_FAIL; | |
563 | ||
564 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
245ba56a KS |
565 | |
566 | response_done: | |
567 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
568 | ||
569 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 570 | VM_PKT_DATA_INBAND, 0); |
245ba56a | 571 | |
245ba56a KS |
572 | } |
573 | ||
574 | /* | |
575 | * This callback is invoked when we get a KVP message from the host. | |
576 | * The host ensures that only one KVP transaction can be active at a time. | |
577 | * KVP implementation in Linux needs to forward the key to a user-mde | |
578 | * component to retrive the corresponding value. Consequently, we cannot | |
579 | * respond to the host in the conext of this callback. Since the host | |
580 | * guarantees that at most only one transaction can be active at a time, | |
581 | * we stash away the transaction state in a set of global variables. | |
582 | */ | |
583 | ||
584 | void hv_kvp_onchannelcallback(void *context) | |
585 | { | |
586 | struct vmbus_channel *channel = context; | |
587 | u32 recvlen; | |
588 | u64 requestid; | |
589 | ||
590 | struct hv_kvp_msg *kvp_msg; | |
245ba56a KS |
591 | |
592 | struct icmsg_hdr *icmsghdrp; | |
593 | struct icmsg_negotiate *negop = NULL; | |
3a491605 S |
594 | int util_fw_version; |
595 | int kvp_srv_version; | |
245ba56a | 596 | |
fa3d5b85 S |
597 | if (kvp_transaction.active) { |
598 | /* | |
599 | * We will defer processing this callback once | |
600 | * the current transaction is complete. | |
601 | */ | |
602 | kvp_transaction.kvp_context = context; | |
603 | return; | |
604 | } | |
245ba56a | 605 | |
03db7724 S |
606 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen, |
607 | &requestid); | |
245ba56a KS |
608 | |
609 | if (recvlen > 0) { | |
245ba56a KS |
610 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
611 | sizeof(struct vmbuspipe_hdr)]; | |
612 | ||
613 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
6741335b | 614 | /* |
3a491605 S |
615 | * Based on the host, select appropriate |
616 | * framework and service versions we will | |
617 | * negotiate. | |
6741335b | 618 | */ |
3a491605 S |
619 | switch (vmbus_proto_version) { |
620 | case (VERSION_WS2008): | |
621 | util_fw_version = UTIL_WS2K8_FW_VERSION; | |
622 | kvp_srv_version = WS2008_SRV_VERSION; | |
623 | break; | |
624 | case (VERSION_WIN7): | |
625 | util_fw_version = UTIL_FW_VERSION; | |
626 | kvp_srv_version = WIN7_SRV_VERSION; | |
627 | break; | |
628 | default: | |
629 | util_fw_version = UTIL_FW_VERSION; | |
630 | kvp_srv_version = WIN8_SRV_VERSION; | |
631 | } | |
c836d0ab | 632 | vmbus_prep_negotiate_resp(icmsghdrp, negop, |
3a491605 S |
633 | recv_buffer, util_fw_version, |
634 | kvp_srv_version); | |
6741335b | 635 | |
245ba56a KS |
636 | } else { |
637 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
638 | sizeof(struct vmbuspipe_hdr) + | |
639 | sizeof(struct icmsg_hdr)]; | |
640 | ||
245ba56a KS |
641 | /* |
642 | * Stash away this global state for completing the | |
643 | * transaction; note transactions are serialized. | |
644 | */ | |
fa3d5b85 | 645 | |
245ba56a KS |
646 | kvp_transaction.recv_len = recvlen; |
647 | kvp_transaction.recv_channel = channel; | |
648 | kvp_transaction.recv_req_id = requestid; | |
649 | kvp_transaction.active = true; | |
fa3d5b85 | 650 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a KS |
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 | */ | |
e2bb6537 S |
661 | schedule_work(&kvp_sendkey_work); |
662 | schedule_delayed_work(&kvp_work, 5*HZ); | |
245ba56a KS |
663 | |
664 | return; | |
665 | ||
666 | } | |
667 | ||
245ba56a KS |
668 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
669 | | ICMSGHDRFLAG_RESPONSE; | |
670 | ||
671 | vmbus_sendpacket(channel, recv_buffer, | |
672 | recvlen, requestid, | |
415f2287 | 673 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
674 | } |
675 | ||
676 | } | |
677 | ||
678 | int | |
a29b643c | 679 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a KS |
680 | { |
681 | int err; | |
682 | ||
683 | err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback); | |
684 | if (err) | |
685 | return err; | |
a29b643c | 686 | recv_buffer = srv->recv_buffer; |
245ba56a | 687 | |
fa3d5b85 S |
688 | /* |
689 | * When this driver loads, the user level daemon that | |
690 | * processes the host requests may not yet be running. | |
691 | * Defer processing channel callbacks until the daemon | |
692 | * has registered. | |
693 | */ | |
694 | kvp_transaction.active = true; | |
695 | ||
245ba56a KS |
696 | return 0; |
697 | } | |
698 | ||
699 | void hv_kvp_deinit(void) | |
700 | { | |
701 | cn_del_callback(&kvp_id); | |
702 | cancel_delayed_work_sync(&kvp_work); | |
e2bb6537 | 703 | cancel_work_sync(&kvp_sendkey_work); |
245ba56a | 704 | } |