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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 | |
3647a83d | 31 | #include "hyperv_vmbus.h" |
11bc3a5f | 32 | #include "hv_utils_transport.h" |
245ba56a | 33 | |
6741335b S |
34 | /* |
35 | * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7) | |
36 | */ | |
3a491605 S |
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 | ||
6741335b S |
41 | #define WIN7_SRV_MAJOR 3 |
42 | #define WIN7_SRV_MINOR 0 | |
3a491605 | 43 | #define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR) |
6741335b S |
44 | |
45 | #define WIN8_SRV_MAJOR 4 | |
46 | #define WIN8_SRV_MINOR 0 | |
3a491605 | 47 | #define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) |
245ba56a KS |
48 | |
49 | /* | |
97bf16cd VK |
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. | |
245ba56a | 56 | * |
97bf16cd VK |
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. | |
245ba56a KS |
61 | */ |
62 | ||
63 | static struct { | |
97bf16cd | 64 | int state; /* hvutil_device_state */ |
245ba56a | 65 | int recv_len; /* number of bytes received. */ |
fa3d5b85 | 66 | struct hv_kvp_msg *kvp_msg; /* current message */ |
245ba56a KS |
67 | struct vmbus_channel *recv_channel; /* chn we got the request */ |
68 | u64 recv_req_id; /* request ID. */ | |
69 | } kvp_transaction; | |
70 | ||
b47a81dc S |
71 | /* |
72 | * This state maintains the version number registered by the daemon. | |
73 | */ | |
74 | static int dm_reg_value; | |
75 | ||
e2bb6537 | 76 | static void kvp_send_key(struct work_struct *dummy); |
245ba56a | 77 | |
76e5f813 | 78 | |
03db7724 | 79 | static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); |
68c8b39a | 80 | static void kvp_timeout_func(struct work_struct *dummy); |
b47a81dc | 81 | static void kvp_register(int); |
245ba56a | 82 | |
68c8b39a | 83 | static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); |
e2bb6537 | 84 | static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); |
245ba56a | 85 | |
11bc3a5f | 86 | static const char kvp_devname[] = "vmbus/hv_kvp"; |
245ba56a | 87 | static u8 *recv_buffer; |
11bc3a5f | 88 | static struct hvutil_transport *hvt; |
245ba56a KS |
89 | /* |
90 | * Register the kernel component with the user-level daemon. | |
91 | * As part of this registration, pass the LIC version number. | |
cfc25993 | 92 | * This number has no meaning, it satisfies the registration protocol. |
245ba56a | 93 | */ |
cfc25993 | 94 | #define HV_DRV_VERSION "3.1" |
245ba56a | 95 | |
3cace4a6 OH |
96 | static 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 | ||
245ba56a | 103 | static void |
b47a81dc | 104 | kvp_register(int reg_value) |
245ba56a KS |
105 | { |
106 | ||
26403354 S |
107 | struct hv_kvp_msg *kvp_msg; |
108 | char *version; | |
245ba56a | 109 | |
11bc3a5f | 110 | kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); |
245ba56a | 111 | |
11bc3a5f | 112 | if (kvp_msg) { |
e485ceac | 113 | version = kvp_msg->body.kvp_register.version; |
b47a81dc | 114 | kvp_msg->kvp_hdr.operation = reg_value; |
26403354 | 115 | strcpy(version, HV_DRV_VERSION); |
11bc3a5f VK |
116 | |
117 | hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg)); | |
118 | kfree(kvp_msg); | |
245ba56a KS |
119 | } |
120 | } | |
68c8b39a VK |
121 | |
122 | static void kvp_timeout_func(struct work_struct *dummy) | |
245ba56a KS |
123 | { |
124 | /* | |
125 | * If the timer fires, the user-mode component has not responded; | |
126 | * process the pending transaction. | |
127 | */ | |
03db7724 | 128 | kvp_respond_to_host(NULL, HV_E_FAIL); |
97bf16cd | 129 | |
3cace4a6 | 130 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
b47a81dc S |
131 | } |
132 | ||
133 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) | |
134 | { | |
b47a81dc S |
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); | |
11bc3a5f | 148 | return -EINVAL; |
b47a81dc S |
149 | } |
150 | ||
11bc3a5f VK |
151 | /* |
152 | * We have a compatible daemon; complete the handshake. | |
153 | */ | |
7c959127 VK |
154 | pr_debug("KVP: userspace daemon ver. %d registered\n", |
155 | KVP_OP_REGISTER); | |
11bc3a5f | 156 | kvp_register(dm_reg_value); |
2d0c3b5a | 157 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
11bc3a5f VK |
158 | |
159 | return 0; | |
245ba56a KS |
160 | } |
161 | ||
b47a81dc | 162 | |
245ba56a KS |
163 | /* |
164 | * Callback when data is received from user mode. | |
165 | */ | |
166 | ||
11bc3a5f | 167 | static int kvp_on_msg(void *msg, int len) |
245ba56a | 168 | { |
11bc3a5f | 169 | struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; |
26403354 | 170 | struct hv_kvp_msg_enumerate *data; |
b47a81dc | 171 | int error = 0; |
245ba56a | 172 | |
11bc3a5f VK |
173 | if (len < sizeof(*message)) |
174 | return -EINVAL; | |
b47a81dc S |
175 | |
176 | /* | |
177 | * If we are negotiating the version information | |
178 | * with the daemon; handle that first. | |
179 | */ | |
180 | ||
97bf16cd | 181 | if (kvp_transaction.state < HVUTIL_READY) { |
11bc3a5f | 182 | return kvp_handle_handshake(message); |
b47a81dc S |
183 | } |
184 | ||
97bf16cd VK |
185 | /* We didn't send anything to userspace so the reply is spurious */ |
186 | if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) | |
11bc3a5f VK |
187 | return -EINVAL; |
188 | ||
97bf16cd VK |
189 | kvp_transaction.state = HVUTIL_USERSPACE_RECV; |
190 | ||
b47a81dc S |
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) { | |
fa3d5b85 | 199 | case KVP_OP_REGISTER: |
b47a81dc S |
200 | /* |
201 | * Null string is used to pass back error condition. | |
202 | */ | |
203 | if (data->data.key[0] == 0) | |
204 | error = HV_S_CONT; | |
fa3d5b85 | 205 | break; |
245ba56a | 206 | |
b47a81dc | 207 | case KVP_OP_REGISTER1: |
245ba56a | 208 | /* |
b47a81dc S |
209 | * We use the message header information from |
210 | * the user level daemon to transmit errors. | |
245ba56a | 211 | */ |
b47a81dc S |
212 | error = message->error; |
213 | break; | |
245ba56a | 214 | } |
b47a81dc S |
215 | |
216 | /* | |
217 | * Complete the transaction by forwarding the key value | |
218 | * to the host. But first, cancel the timeout. | |
219 | */ | |
97bf16cd | 220 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
03db7724 | 221 | kvp_respond_to_host(message, error); |
3cace4a6 | 222 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
97bf16cd | 223 | } |
11bc3a5f VK |
224 | |
225 | return 0; | |
245ba56a KS |
226 | } |
227 | ||
03db7724 S |
228 | |
229 | static 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; | |
a500e0e7 S |
282 | out->kvp_ip_val.addr_family = |
283 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
284 | } |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static 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 | ||
e2bb6537 S |
339 | static void |
340 | kvp_send_key(struct work_struct *dummy) | |
245ba56a | 341 | { |
26403354 | 342 | struct hv_kvp_msg *message; |
fa3d5b85 S |
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; | |
8d9560eb | 348 | int rc; |
245ba56a | 349 | |
97bf16cd VK |
350 | /* The transaction state is wrong. */ |
351 | if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) | |
352 | return; | |
353 | ||
11bc3a5f | 354 | message = kzalloc(sizeof(*message), GFP_KERNEL); |
b36fda33 VK |
355 | if (!message) |
356 | return; | |
357 | ||
fa3d5b85 S |
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) { | |
03db7724 S |
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; | |
fa3d5b85 S |
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; | |
245ba56a | 442 | } |
fa3d5b85 | 443 | |
97bf16cd | 444 | kvp_transaction.state = HVUTIL_USERSPACE_REQ; |
11bc3a5f | 445 | rc = hvutil_transport_send(hvt, message, sizeof(*message)); |
8d9560eb VK |
446 | if (rc) { |
447 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
97bf16cd | 448 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
8d9560eb | 449 | kvp_respond_to_host(message, HV_E_FAIL); |
97bf16cd VK |
450 | kvp_transaction.state = HVUTIL_READY; |
451 | } | |
8d9560eb VK |
452 | } |
453 | ||
11bc3a5f | 454 | kfree(message); |
fa3d5b85 | 455 | |
e2bb6537 | 456 | return; |
245ba56a KS |
457 | } |
458 | ||
459 | /* | |
460 | * Send a response back to the host. | |
461 | */ | |
462 | ||
463 | static void | |
03db7724 | 464 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
465 | { |
466 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 467 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 468 | char *key_name; |
03db7724 | 469 | char *value; |
245ba56a | 470 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
471 | int keylen = 0; |
472 | int valuelen = 0; | |
245ba56a KS |
473 | u32 buf_len; |
474 | struct vmbus_channel *channel; | |
475 | u64 req_id; | |
03db7724 | 476 | int ret; |
245ba56a | 477 | |
245ba56a KS |
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 | ||
fa3d5b85 S |
487 | icmsghdrp = (struct icmsg_hdr *) |
488 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
489 | ||
4e65f6e8 S |
490 | if (channel->onchannel_callback == NULL) |
491 | /* | |
492 | * We have raced with util driver being unloaded; | |
493 | * silently return. | |
494 | */ | |
495 | return; | |
496 | ||
b47a81dc | 497 | icmsghdrp->status = error; |
245ba56a KS |
498 | |
499 | /* | |
adc80ae6 S |
500 | * If the error parameter is set, terminate the host's enumeration |
501 | * on this pool. | |
245ba56a KS |
502 | */ |
503 | if (error) { | |
504 | /* | |
b47a81dc S |
505 | * Something failed or we have timedout; |
506 | * terminate the current host-side iteration. | |
245ba56a | 507 | */ |
245ba56a KS |
508 | goto response_done; |
509 | } | |
510 | ||
fa3d5b85 S |
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) { | |
03db7724 S |
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; | |
fa3d5b85 S |
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; | |
03db7724 | 539 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 540 | |
245ba56a KS |
541 | /* |
542 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
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). | |
245ba56a | 546 | */ |
0720a06a | 547 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
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 | ||
552 | copy_value: | |
03db7724 | 553 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 554 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
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 */ | |
245ba56a | 558 | |
fa3d5b85 S |
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 */ | |
245ba56a KS |
567 | |
568 | response_done: | |
569 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
570 | ||
571 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 572 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
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 | ||
585 | void 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; | |
245ba56a KS |
592 | |
593 | struct icmsg_hdr *icmsghdrp; | |
594 | struct icmsg_negotiate *negop = NULL; | |
3a491605 S |
595 | int util_fw_version; |
596 | int kvp_srv_version; | |
245ba56a | 597 | |
3cace4a6 | 598 | if (kvp_transaction.state > HVUTIL_READY) |
fa3d5b85 | 599 | return; |
245ba56a | 600 | |
9bd2d0df | 601 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, |
03db7724 | 602 | &requestid); |
245ba56a KS |
603 | |
604 | if (recvlen > 0) { | |
245ba56a KS |
605 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
606 | sizeof(struct vmbuspipe_hdr)]; | |
607 | ||
608 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
6741335b | 609 | /* |
3a491605 S |
610 | * Based on the host, select appropriate |
611 | * framework and service versions we will | |
612 | * negotiate. | |
6741335b | 613 | */ |
3a491605 S |
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 | } | |
c836d0ab | 627 | vmbus_prep_negotiate_resp(icmsghdrp, negop, |
3a491605 S |
628 | recv_buffer, util_fw_version, |
629 | kvp_srv_version); | |
6741335b | 630 | |
245ba56a KS |
631 | } else { |
632 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
633 | sizeof(struct vmbuspipe_hdr) + | |
634 | sizeof(struct icmsg_hdr)]; | |
635 | ||
245ba56a KS |
636 | /* |
637 | * Stash away this global state for completing the | |
638 | * transaction; note transactions are serialized. | |
639 | */ | |
fa3d5b85 | 640 | |
245ba56a KS |
641 | kvp_transaction.recv_len = recvlen; |
642 | kvp_transaction.recv_channel = channel; | |
643 | kvp_transaction.recv_req_id = requestid; | |
fa3d5b85 | 644 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a | 645 | |
97bf16cd VK |
646 | if (kvp_transaction.state < HVUTIL_READY) { |
647 | /* Userspace is not registered yet */ | |
648 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
649 | return; | |
650 | } | |
651 | kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
652 | ||
245ba56a KS |
653 | /* |
654 | * Get the information from the | |
655 | * user-mode component. | |
656 | * component. This transaction will be | |
657 | * completed when we get the value from | |
658 | * the user-mode component. | |
659 | * Set a timeout to deal with | |
660 | * user-mode not responding. | |
661 | */ | |
e2bb6537 | 662 | schedule_work(&kvp_sendkey_work); |
c0b200cf S |
663 | schedule_delayed_work(&kvp_timeout_work, |
664 | HV_UTIL_TIMEOUT * HZ); | |
245ba56a KS |
665 | |
666 | return; | |
667 | ||
668 | } | |
669 | ||
245ba56a KS |
670 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
671 | | ICMSGHDRFLAG_RESPONSE; | |
672 | ||
673 | vmbus_sendpacket(channel, recv_buffer, | |
674 | recvlen, requestid, | |
415f2287 | 675 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
676 | } |
677 | ||
678 | } | |
679 | ||
11bc3a5f VK |
680 | static void kvp_on_reset(void) |
681 | { | |
682 | if (cancel_delayed_work_sync(&kvp_timeout_work)) | |
683 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
684 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
685 | } | |
686 | ||
245ba56a | 687 | int |
a29b643c | 688 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a | 689 | { |
a29b643c | 690 | recv_buffer = srv->recv_buffer; |
245ba56a | 691 | |
fa3d5b85 S |
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 | */ | |
97bf16cd | 698 | kvp_transaction.state = HVUTIL_DEVICE_INIT; |
fa3d5b85 | 699 | |
11bc3a5f VK |
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 | ||
245ba56a KS |
705 | return 0; |
706 | } | |
707 | ||
708 | void hv_kvp_deinit(void) | |
709 | { | |
97bf16cd | 710 | kvp_transaction.state = HVUTIL_DEVICE_DYING; |
68c8b39a | 711 | cancel_delayed_work_sync(&kvp_timeout_work); |
e2bb6537 | 712 | cancel_work_sync(&kvp_sendkey_work); |
11bc3a5f | 713 | hvutil_transport_destroy(hvt); |
245ba56a | 714 | } |