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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 | ||
9bd2d0df S |
130 | static void poll_channel(struct vmbus_channel *channel) |
131 | { | |
132 | if (channel->target_cpu != smp_processor_id()) | |
133 | smp_call_function_single(channel->target_cpu, | |
134 | hv_kvp_onchannelcallback, | |
135 | channel, true); | |
136 | else | |
137 | hv_kvp_onchannelcallback(channel); | |
138 | } | |
139 | ||
140 | ||
b47a81dc S |
141 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) |
142 | { | |
143 | int ret = 1; | |
144 | ||
145 | switch (msg->kvp_hdr.operation) { | |
146 | case KVP_OP_REGISTER: | |
147 | dm_reg_value = KVP_OP_REGISTER; | |
148 | pr_info("KVP: IP injection functionality not available\n"); | |
149 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
150 | break; | |
151 | case KVP_OP_REGISTER1: | |
152 | dm_reg_value = KVP_OP_REGISTER1; | |
153 | break; | |
154 | default: | |
155 | pr_info("KVP: incompatible daemon\n"); | |
156 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
157 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
158 | ret = 0; | |
159 | } | |
160 | ||
161 | if (ret) { | |
162 | /* | |
163 | * We have a compatible daemon; complete the handshake. | |
164 | */ | |
165 | pr_info("KVP: user-mode registering done.\n"); | |
166 | kvp_register(dm_reg_value); | |
167 | kvp_transaction.active = false; | |
168 | if (kvp_transaction.kvp_context) | |
9bd2d0df | 169 | poll_channel(kvp_transaction.kvp_context); |
b47a81dc S |
170 | } |
171 | return ret; | |
245ba56a KS |
172 | } |
173 | ||
b47a81dc | 174 | |
245ba56a KS |
175 | /* |
176 | * Callback when data is received from user mode. | |
177 | */ | |
178 | ||
179 | static void | |
180 | kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) | |
181 | { | |
26403354 S |
182 | struct hv_kvp_msg *message; |
183 | struct hv_kvp_msg_enumerate *data; | |
b47a81dc | 184 | int error = 0; |
245ba56a | 185 | |
26403354 | 186 | message = (struct hv_kvp_msg *)msg->data; |
b47a81dc S |
187 | |
188 | /* | |
189 | * If we are negotiating the version information | |
190 | * with the daemon; handle that first. | |
191 | */ | |
192 | ||
193 | if (in_hand_shake) { | |
194 | if (kvp_handle_handshake(message)) | |
195 | in_hand_shake = false; | |
196 | return; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Based on the version of the daemon, we propagate errors from the | |
201 | * daemon differently. | |
202 | */ | |
203 | ||
204 | data = &message->body.kvp_enum_data; | |
205 | ||
206 | switch (dm_reg_value) { | |
fa3d5b85 | 207 | case KVP_OP_REGISTER: |
b47a81dc S |
208 | /* |
209 | * Null string is used to pass back error condition. | |
210 | */ | |
211 | if (data->data.key[0] == 0) | |
212 | error = HV_S_CONT; | |
fa3d5b85 | 213 | break; |
245ba56a | 214 | |
b47a81dc | 215 | case KVP_OP_REGISTER1: |
245ba56a | 216 | /* |
b47a81dc S |
217 | * We use the message header information from |
218 | * the user level daemon to transmit errors. | |
245ba56a | 219 | */ |
b47a81dc S |
220 | error = message->error; |
221 | break; | |
245ba56a | 222 | } |
b47a81dc S |
223 | |
224 | /* | |
225 | * Complete the transaction by forwarding the key value | |
226 | * to the host. But first, cancel the timeout. | |
227 | */ | |
228 | if (cancel_delayed_work_sync(&kvp_work)) | |
03db7724 | 229 | kvp_respond_to_host(message, error); |
245ba56a KS |
230 | } |
231 | ||
03db7724 S |
232 | |
233 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
234 | { | |
235 | struct hv_kvp_msg *in = in_msg; | |
236 | struct hv_kvp_ip_msg *out = out_msg; | |
237 | int len; | |
238 | ||
239 | switch (op) { | |
240 | case KVP_OP_GET_IP_INFO: | |
241 | /* | |
242 | * Transform all parameters into utf16 encoding. | |
243 | */ | |
244 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
245 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
246 | UTF16_HOST_ENDIAN, | |
247 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
248 | MAX_IP_ADDR_SIZE); | |
249 | if (len < 0) | |
250 | return len; | |
251 | ||
252 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
253 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
254 | UTF16_HOST_ENDIAN, | |
255 | (wchar_t *)out->kvp_ip_val.sub_net, | |
256 | MAX_IP_ADDR_SIZE); | |
257 | if (len < 0) | |
258 | return len; | |
259 | ||
260 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
261 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
262 | UTF16_HOST_ENDIAN, | |
263 | (wchar_t *)out->kvp_ip_val.gate_way, | |
264 | MAX_GATEWAY_SIZE); | |
265 | if (len < 0) | |
266 | return len; | |
267 | ||
268 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
269 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
270 | UTF16_HOST_ENDIAN, | |
271 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
272 | MAX_IP_ADDR_SIZE); | |
273 | if (len < 0) | |
274 | return len; | |
275 | ||
276 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
277 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
278 | UTF16_HOST_ENDIAN, | |
279 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
280 | MAX_IP_ADDR_SIZE); | |
281 | if (len < 0) | |
282 | return len; | |
283 | ||
284 | out->kvp_ip_val.dhcp_enabled = | |
285 | in->body.kvp_ip_val.dhcp_enabled; | |
a500e0e7 S |
286 | out->kvp_ip_val.addr_family = |
287 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
288 | } |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
294 | { | |
295 | struct hv_kvp_ip_msg *in = in_msg; | |
296 | struct hv_kvp_msg *out = out_msg; | |
297 | ||
298 | switch (op) { | |
299 | case KVP_OP_SET_IP_INFO: | |
300 | /* | |
301 | * Transform all parameters into utf8 encoding. | |
302 | */ | |
303 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
304 | MAX_IP_ADDR_SIZE, | |
305 | UTF16_LITTLE_ENDIAN, | |
306 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
307 | MAX_IP_ADDR_SIZE); | |
308 | ||
309 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
310 | MAX_IP_ADDR_SIZE, | |
311 | UTF16_LITTLE_ENDIAN, | |
312 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
313 | MAX_IP_ADDR_SIZE); | |
314 | ||
315 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
316 | MAX_GATEWAY_SIZE, | |
317 | UTF16_LITTLE_ENDIAN, | |
318 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
319 | MAX_GATEWAY_SIZE); | |
320 | ||
321 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
322 | MAX_IP_ADDR_SIZE, | |
323 | UTF16_LITTLE_ENDIAN, | |
324 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
325 | MAX_IP_ADDR_SIZE); | |
326 | ||
327 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
328 | ||
329 | default: | |
330 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
331 | MAX_ADAPTER_ID_SIZE, | |
332 | UTF16_LITTLE_ENDIAN, | |
333 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
334 | MAX_ADAPTER_ID_SIZE); | |
335 | ||
336 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
337 | } | |
338 | } | |
339 | ||
340 | ||
341 | ||
342 | ||
e2bb6537 S |
343 | static void |
344 | kvp_send_key(struct work_struct *dummy) | |
245ba56a KS |
345 | { |
346 | struct cn_msg *msg; | |
26403354 | 347 | struct hv_kvp_msg *message; |
fa3d5b85 S |
348 | struct hv_kvp_msg *in_msg; |
349 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
350 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
351 | __u32 val32; | |
352 | __u64 val64; | |
8d9560eb | 353 | int rc; |
245ba56a KS |
354 | |
355 | msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC); | |
fa3d5b85 S |
356 | if (!msg) |
357 | return; | |
245ba56a | 358 | |
fa3d5b85 S |
359 | msg->id.idx = CN_KVP_IDX; |
360 | msg->id.val = CN_KVP_VAL; | |
26403354 | 361 | |
fa3d5b85 S |
362 | message = (struct hv_kvp_msg *)msg->data; |
363 | message->kvp_hdr.operation = operation; | |
364 | message->kvp_hdr.pool = pool; | |
365 | in_msg = kvp_transaction.kvp_msg; | |
366 | ||
367 | /* | |
368 | * The key/value strings sent from the host are encoded in | |
369 | * in utf16; convert it to utf8 strings. | |
370 | * The host assures us that the utf16 strings will not exceed | |
371 | * the max lengths specified. We will however, reserve room | |
372 | * for the string terminating character - in the utf16s_utf8s() | |
373 | * function we limit the size of the buffer where the converted | |
374 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
375 | * that the strings can be properly terminated! | |
376 | */ | |
377 | ||
378 | switch (message->kvp_hdr.operation) { | |
03db7724 S |
379 | case KVP_OP_SET_IP_INFO: |
380 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
381 | break; | |
382 | case KVP_OP_GET_IP_INFO: | |
383 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
384 | break; | |
fa3d5b85 S |
385 | case KVP_OP_SET: |
386 | switch (in_msg->body.kvp_set.data.value_type) { | |
387 | case REG_SZ: | |
388 | /* | |
389 | * The value is a string - utf16 encoding. | |
390 | */ | |
391 | message->body.kvp_set.data.value_size = | |
392 | utf16s_to_utf8s( | |
393 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
394 | in_msg->body.kvp_set.data.value_size, | |
395 | UTF16_LITTLE_ENDIAN, | |
396 | message->body.kvp_set.data.value, | |
397 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
398 | break; | |
399 | ||
400 | case REG_U32: | |
401 | /* | |
402 | * The value is a 32 bit scalar. | |
403 | * We save this as a utf8 string. | |
404 | */ | |
405 | val32 = in_msg->body.kvp_set.data.value_u32; | |
406 | message->body.kvp_set.data.value_size = | |
407 | sprintf(message->body.kvp_set.data.value, | |
408 | "%d", val32) + 1; | |
409 | break; | |
410 | ||
411 | case REG_U64: | |
412 | /* | |
413 | * The value is a 64 bit scalar. | |
414 | * We save this as a utf8 string. | |
415 | */ | |
416 | val64 = in_msg->body.kvp_set.data.value_u64; | |
417 | message->body.kvp_set.data.value_size = | |
418 | sprintf(message->body.kvp_set.data.value, | |
419 | "%llu", val64) + 1; | |
420 | break; | |
421 | ||
422 | } | |
423 | case KVP_OP_GET: | |
424 | message->body.kvp_set.data.key_size = | |
425 | utf16s_to_utf8s( | |
426 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
427 | in_msg->body.kvp_set.data.key_size, | |
428 | UTF16_LITTLE_ENDIAN, | |
429 | message->body.kvp_set.data.key, | |
430 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
431 | break; | |
432 | ||
433 | case KVP_OP_DELETE: | |
434 | message->body.kvp_delete.key_size = | |
435 | utf16s_to_utf8s( | |
436 | (wchar_t *)in_msg->body.kvp_delete.key, | |
437 | in_msg->body.kvp_delete.key_size, | |
438 | UTF16_LITTLE_ENDIAN, | |
439 | message->body.kvp_delete.key, | |
440 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
441 | break; | |
442 | ||
443 | case KVP_OP_ENUMERATE: | |
444 | message->body.kvp_enum_data.index = | |
445 | in_msg->body.kvp_enum_data.index; | |
446 | break; | |
245ba56a | 447 | } |
fa3d5b85 S |
448 | |
449 | msg->len = sizeof(struct hv_kvp_msg); | |
8d9560eb VK |
450 | rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC); |
451 | if (rc) { | |
452 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
453 | if (cancel_delayed_work_sync(&kvp_work)) | |
454 | kvp_respond_to_host(message, HV_E_FAIL); | |
455 | } | |
456 | ||
fa3d5b85 S |
457 | kfree(msg); |
458 | ||
e2bb6537 | 459 | return; |
245ba56a KS |
460 | } |
461 | ||
462 | /* | |
463 | * Send a response back to the host. | |
464 | */ | |
465 | ||
466 | static void | |
03db7724 | 467 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
468 | { |
469 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 470 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 471 | char *key_name; |
03db7724 | 472 | char *value; |
245ba56a | 473 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
474 | int keylen = 0; |
475 | int valuelen = 0; | |
245ba56a KS |
476 | u32 buf_len; |
477 | struct vmbus_channel *channel; | |
478 | u64 req_id; | |
03db7724 | 479 | int ret; |
245ba56a KS |
480 | |
481 | /* | |
482 | * If a transaction is not active; log and return. | |
483 | */ | |
484 | ||
485 | if (!kvp_transaction.active) { | |
486 | /* | |
487 | * This is a spurious call! | |
488 | */ | |
af7a5b6e | 489 | pr_warn("KVP: Transaction not active\n"); |
245ba56a KS |
490 | return; |
491 | } | |
492 | /* | |
493 | * Copy the global state for completing the transaction. Note that | |
494 | * only one transaction can be active at a time. | |
495 | */ | |
496 | ||
497 | buf_len = kvp_transaction.recv_len; | |
498 | channel = kvp_transaction.recv_channel; | |
499 | req_id = kvp_transaction.recv_req_id; | |
500 | ||
76e5f813 S |
501 | kvp_transaction.active = false; |
502 | ||
fa3d5b85 S |
503 | icmsghdrp = (struct icmsg_hdr *) |
504 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
505 | ||
4e65f6e8 S |
506 | if (channel->onchannel_callback == NULL) |
507 | /* | |
508 | * We have raced with util driver being unloaded; | |
509 | * silently return. | |
510 | */ | |
511 | return; | |
512 | ||
b47a81dc | 513 | icmsghdrp->status = error; |
245ba56a KS |
514 | |
515 | /* | |
adc80ae6 S |
516 | * If the error parameter is set, terminate the host's enumeration |
517 | * on this pool. | |
245ba56a KS |
518 | */ |
519 | if (error) { | |
520 | /* | |
b47a81dc S |
521 | * Something failed or we have timedout; |
522 | * terminate the current host-side iteration. | |
245ba56a | 523 | */ |
245ba56a KS |
524 | goto response_done; |
525 | } | |
526 | ||
fa3d5b85 S |
527 | kvp_msg = (struct hv_kvp_msg *) |
528 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
529 | sizeof(struct icmsg_hdr)]; | |
530 | ||
531 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
03db7724 S |
532 | case KVP_OP_GET_IP_INFO: |
533 | ret = process_ob_ipinfo(msg_to_host, | |
534 | (struct hv_kvp_ip_msg *)kvp_msg, | |
535 | KVP_OP_GET_IP_INFO); | |
536 | if (ret < 0) | |
537 | icmsghdrp->status = HV_E_FAIL; | |
538 | ||
539 | goto response_done; | |
540 | case KVP_OP_SET_IP_INFO: | |
541 | goto response_done; | |
fa3d5b85 S |
542 | case KVP_OP_GET: |
543 | kvp_data = &kvp_msg->body.kvp_get.data; | |
544 | goto copy_value; | |
545 | ||
546 | case KVP_OP_SET: | |
547 | case KVP_OP_DELETE: | |
548 | goto response_done; | |
549 | ||
550 | default: | |
551 | break; | |
552 | } | |
553 | ||
554 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
03db7724 | 555 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 556 | |
245ba56a KS |
557 | /* |
558 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
559 | * in utf16. Ensure that the key/value size reported to the host |
560 | * will be less than or equal to the MAX size (including the | |
561 | * terminating character). | |
245ba56a | 562 | */ |
0720a06a | 563 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
564 | (wchar_t *) kvp_data->key, |
565 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
566 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
567 | ||
568 | copy_value: | |
03db7724 | 569 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 570 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
571 | (wchar_t *) kvp_data->value, |
572 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
573 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
245ba56a | 574 | |
fa3d5b85 S |
575 | /* |
576 | * If the utf8s to utf16s conversion failed; notify host | |
577 | * of the error. | |
578 | */ | |
579 | if ((keylen < 0) || (valuelen < 0)) | |
580 | icmsghdrp->status = HV_E_FAIL; | |
581 | ||
582 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
245ba56a KS |
583 | |
584 | response_done: | |
585 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
586 | ||
587 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 588 | VM_PKT_DATA_INBAND, 0); |
9bd2d0df | 589 | poll_channel(channel); |
245ba56a KS |
590 | } |
591 | ||
592 | /* | |
593 | * This callback is invoked when we get a KVP message from the host. | |
594 | * The host ensures that only one KVP transaction can be active at a time. | |
595 | * KVP implementation in Linux needs to forward the key to a user-mde | |
596 | * component to retrive the corresponding value. Consequently, we cannot | |
597 | * respond to the host in the conext of this callback. Since the host | |
598 | * guarantees that at most only one transaction can be active at a time, | |
599 | * we stash away the transaction state in a set of global variables. | |
600 | */ | |
601 | ||
602 | void hv_kvp_onchannelcallback(void *context) | |
603 | { | |
604 | struct vmbus_channel *channel = context; | |
605 | u32 recvlen; | |
606 | u64 requestid; | |
607 | ||
608 | struct hv_kvp_msg *kvp_msg; | |
245ba56a KS |
609 | |
610 | struct icmsg_hdr *icmsghdrp; | |
611 | struct icmsg_negotiate *negop = NULL; | |
3a491605 S |
612 | int util_fw_version; |
613 | int kvp_srv_version; | |
245ba56a | 614 | |
fa3d5b85 S |
615 | if (kvp_transaction.active) { |
616 | /* | |
617 | * We will defer processing this callback once | |
618 | * the current transaction is complete. | |
619 | */ | |
620 | kvp_transaction.kvp_context = context; | |
621 | return; | |
622 | } | |
245ba56a | 623 | |
9bd2d0df | 624 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, |
03db7724 | 625 | &requestid); |
245ba56a KS |
626 | |
627 | if (recvlen > 0) { | |
245ba56a KS |
628 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
629 | sizeof(struct vmbuspipe_hdr)]; | |
630 | ||
631 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
6741335b | 632 | /* |
3a491605 S |
633 | * Based on the host, select appropriate |
634 | * framework and service versions we will | |
635 | * negotiate. | |
6741335b | 636 | */ |
3a491605 S |
637 | switch (vmbus_proto_version) { |
638 | case (VERSION_WS2008): | |
639 | util_fw_version = UTIL_WS2K8_FW_VERSION; | |
640 | kvp_srv_version = WS2008_SRV_VERSION; | |
641 | break; | |
642 | case (VERSION_WIN7): | |
643 | util_fw_version = UTIL_FW_VERSION; | |
644 | kvp_srv_version = WIN7_SRV_VERSION; | |
645 | break; | |
646 | default: | |
647 | util_fw_version = UTIL_FW_VERSION; | |
648 | kvp_srv_version = WIN8_SRV_VERSION; | |
649 | } | |
c836d0ab | 650 | vmbus_prep_negotiate_resp(icmsghdrp, negop, |
3a491605 S |
651 | recv_buffer, util_fw_version, |
652 | kvp_srv_version); | |
6741335b | 653 | |
245ba56a KS |
654 | } else { |
655 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
656 | sizeof(struct vmbuspipe_hdr) + | |
657 | sizeof(struct icmsg_hdr)]; | |
658 | ||
245ba56a KS |
659 | /* |
660 | * Stash away this global state for completing the | |
661 | * transaction; note transactions are serialized. | |
662 | */ | |
fa3d5b85 | 663 | |
245ba56a KS |
664 | kvp_transaction.recv_len = recvlen; |
665 | kvp_transaction.recv_channel = channel; | |
666 | kvp_transaction.recv_req_id = requestid; | |
667 | kvp_transaction.active = true; | |
fa3d5b85 | 668 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a KS |
669 | |
670 | /* | |
671 | * Get the information from the | |
672 | * user-mode component. | |
673 | * component. This transaction will be | |
674 | * completed when we get the value from | |
675 | * the user-mode component. | |
676 | * Set a timeout to deal with | |
677 | * user-mode not responding. | |
678 | */ | |
e2bb6537 S |
679 | schedule_work(&kvp_sendkey_work); |
680 | schedule_delayed_work(&kvp_work, 5*HZ); | |
245ba56a KS |
681 | |
682 | return; | |
683 | ||
684 | } | |
685 | ||
245ba56a KS |
686 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
687 | | ICMSGHDRFLAG_RESPONSE; | |
688 | ||
689 | vmbus_sendpacket(channel, recv_buffer, | |
690 | recvlen, requestid, | |
415f2287 | 691 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
692 | } |
693 | ||
694 | } | |
695 | ||
696 | int | |
a29b643c | 697 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a KS |
698 | { |
699 | int err; | |
700 | ||
701 | err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback); | |
702 | if (err) | |
703 | return err; | |
a29b643c | 704 | recv_buffer = srv->recv_buffer; |
245ba56a | 705 | |
fa3d5b85 S |
706 | /* |
707 | * When this driver loads, the user level daemon that | |
708 | * processes the host requests may not yet be running. | |
709 | * Defer processing channel callbacks until the daemon | |
710 | * has registered. | |
711 | */ | |
712 | kvp_transaction.active = true; | |
713 | ||
245ba56a KS |
714 | return 0; |
715 | } | |
716 | ||
717 | void hv_kvp_deinit(void) | |
718 | { | |
719 | cn_del_callback(&kvp_id); | |
720 | cancel_delayed_work_sync(&kvp_work); | |
e2bb6537 | 721 | cancel_work_sync(&kvp_sendkey_work); |
245ba56a | 722 | } |