Commit | Line | Data |
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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); |
4dbfc2e6 | 81 | static void kvp_host_handshake_func(struct work_struct *dummy); |
b47a81dc | 82 | static void kvp_register(int); |
245ba56a | 83 | |
68c8b39a | 84 | static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); |
4dbfc2e6 | 85 | static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func); |
e2bb6537 | 86 | static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); |
245ba56a | 87 | |
11bc3a5f | 88 | static const char kvp_devname[] = "vmbus/hv_kvp"; |
245ba56a | 89 | static u8 *recv_buffer; |
11bc3a5f | 90 | static struct hvutil_transport *hvt; |
245ba56a KS |
91 | /* |
92 | * Register the kernel component with the user-level daemon. | |
93 | * As part of this registration, pass the LIC version number. | |
cfc25993 | 94 | * This number has no meaning, it satisfies the registration protocol. |
245ba56a | 95 | */ |
cfc25993 | 96 | #define HV_DRV_VERSION "3.1" |
245ba56a | 97 | |
3cace4a6 OH |
98 | static void kvp_poll_wrapper(void *channel) |
99 | { | |
100 | /* Transaction is finished, reset the state here to avoid races. */ | |
101 | kvp_transaction.state = HVUTIL_READY; | |
102 | hv_kvp_onchannelcallback(channel); | |
103 | } | |
104 | ||
245ba56a | 105 | static void |
b47a81dc | 106 | kvp_register(int reg_value) |
245ba56a KS |
107 | { |
108 | ||
26403354 S |
109 | struct hv_kvp_msg *kvp_msg; |
110 | char *version; | |
245ba56a | 111 | |
11bc3a5f | 112 | kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); |
245ba56a | 113 | |
11bc3a5f | 114 | if (kvp_msg) { |
e485ceac | 115 | version = kvp_msg->body.kvp_register.version; |
b47a81dc | 116 | kvp_msg->kvp_hdr.operation = reg_value; |
26403354 | 117 | strcpy(version, HV_DRV_VERSION); |
11bc3a5f VK |
118 | |
119 | hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg)); | |
120 | kfree(kvp_msg); | |
245ba56a KS |
121 | } |
122 | } | |
68c8b39a VK |
123 | |
124 | static void kvp_timeout_func(struct work_struct *dummy) | |
245ba56a KS |
125 | { |
126 | /* | |
127 | * If the timer fires, the user-mode component has not responded; | |
128 | * process the pending transaction. | |
129 | */ | |
03db7724 | 130 | kvp_respond_to_host(NULL, HV_E_FAIL); |
97bf16cd | 131 | |
3cace4a6 | 132 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
b47a81dc S |
133 | } |
134 | ||
4dbfc2e6 VK |
135 | static void kvp_host_handshake_func(struct work_struct *dummy) |
136 | { | |
137 | hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback); | |
138 | } | |
139 | ||
b47a81dc S |
140 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) |
141 | { | |
b47a81dc S |
142 | switch (msg->kvp_hdr.operation) { |
143 | case KVP_OP_REGISTER: | |
144 | dm_reg_value = KVP_OP_REGISTER; | |
145 | pr_info("KVP: IP injection functionality not available\n"); | |
146 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
147 | break; | |
148 | case KVP_OP_REGISTER1: | |
149 | dm_reg_value = KVP_OP_REGISTER1; | |
150 | break; | |
151 | default: | |
152 | pr_info("KVP: incompatible daemon\n"); | |
153 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
154 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
11bc3a5f | 155 | return -EINVAL; |
b47a81dc S |
156 | } |
157 | ||
11bc3a5f VK |
158 | /* |
159 | * We have a compatible daemon; complete the handshake. | |
160 | */ | |
7c959127 VK |
161 | pr_debug("KVP: userspace daemon ver. %d registered\n", |
162 | KVP_OP_REGISTER); | |
11bc3a5f | 163 | kvp_register(dm_reg_value); |
4dbfc2e6 VK |
164 | |
165 | /* | |
166 | * If we're still negotiating with the host cancel the timeout | |
167 | * work to not poll the channel twice. | |
168 | */ | |
169 | cancel_delayed_work_sync(&kvp_host_handshake_work); | |
2d0c3b5a | 170 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
11bc3a5f VK |
171 | |
172 | return 0; | |
245ba56a KS |
173 | } |
174 | ||
b47a81dc | 175 | |
245ba56a KS |
176 | /* |
177 | * Callback when data is received from user mode. | |
178 | */ | |
179 | ||
11bc3a5f | 180 | static int kvp_on_msg(void *msg, int len) |
245ba56a | 181 | { |
11bc3a5f | 182 | struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; |
26403354 | 183 | struct hv_kvp_msg_enumerate *data; |
b47a81dc | 184 | int error = 0; |
245ba56a | 185 | |
11bc3a5f VK |
186 | if (len < sizeof(*message)) |
187 | return -EINVAL; | |
b47a81dc S |
188 | |
189 | /* | |
190 | * If we are negotiating the version information | |
191 | * with the daemon; handle that first. | |
192 | */ | |
193 | ||
97bf16cd | 194 | if (kvp_transaction.state < HVUTIL_READY) { |
11bc3a5f | 195 | return kvp_handle_handshake(message); |
b47a81dc S |
196 | } |
197 | ||
97bf16cd VK |
198 | /* We didn't send anything to userspace so the reply is spurious */ |
199 | if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) | |
11bc3a5f VK |
200 | return -EINVAL; |
201 | ||
97bf16cd VK |
202 | kvp_transaction.state = HVUTIL_USERSPACE_RECV; |
203 | ||
b47a81dc S |
204 | /* |
205 | * Based on the version of the daemon, we propagate errors from the | |
206 | * daemon differently. | |
207 | */ | |
208 | ||
209 | data = &message->body.kvp_enum_data; | |
210 | ||
211 | switch (dm_reg_value) { | |
fa3d5b85 | 212 | case KVP_OP_REGISTER: |
b47a81dc S |
213 | /* |
214 | * Null string is used to pass back error condition. | |
215 | */ | |
216 | if (data->data.key[0] == 0) | |
217 | error = HV_S_CONT; | |
fa3d5b85 | 218 | break; |
245ba56a | 219 | |
b47a81dc | 220 | case KVP_OP_REGISTER1: |
245ba56a | 221 | /* |
b47a81dc S |
222 | * We use the message header information from |
223 | * the user level daemon to transmit errors. | |
245ba56a | 224 | */ |
b47a81dc S |
225 | error = message->error; |
226 | break; | |
245ba56a | 227 | } |
b47a81dc S |
228 | |
229 | /* | |
230 | * Complete the transaction by forwarding the key value | |
231 | * to the host. But first, cancel the timeout. | |
232 | */ | |
97bf16cd | 233 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
03db7724 | 234 | kvp_respond_to_host(message, error); |
3cace4a6 | 235 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
97bf16cd | 236 | } |
11bc3a5f VK |
237 | |
238 | return 0; | |
245ba56a KS |
239 | } |
240 | ||
03db7724 S |
241 | |
242 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
243 | { | |
244 | struct hv_kvp_msg *in = in_msg; | |
245 | struct hv_kvp_ip_msg *out = out_msg; | |
246 | int len; | |
247 | ||
248 | switch (op) { | |
249 | case KVP_OP_GET_IP_INFO: | |
250 | /* | |
251 | * Transform all parameters into utf16 encoding. | |
252 | */ | |
253 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
254 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
255 | UTF16_HOST_ENDIAN, | |
256 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
257 | MAX_IP_ADDR_SIZE); | |
258 | if (len < 0) | |
259 | return len; | |
260 | ||
261 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
262 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
263 | UTF16_HOST_ENDIAN, | |
264 | (wchar_t *)out->kvp_ip_val.sub_net, | |
265 | MAX_IP_ADDR_SIZE); | |
266 | if (len < 0) | |
267 | return len; | |
268 | ||
269 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
270 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
271 | UTF16_HOST_ENDIAN, | |
272 | (wchar_t *)out->kvp_ip_val.gate_way, | |
273 | MAX_GATEWAY_SIZE); | |
274 | if (len < 0) | |
275 | return len; | |
276 | ||
277 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
278 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
279 | UTF16_HOST_ENDIAN, | |
280 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
281 | MAX_IP_ADDR_SIZE); | |
282 | if (len < 0) | |
283 | return len; | |
284 | ||
285 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
286 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
287 | UTF16_HOST_ENDIAN, | |
288 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
289 | MAX_IP_ADDR_SIZE); | |
290 | if (len < 0) | |
291 | return len; | |
292 | ||
293 | out->kvp_ip_val.dhcp_enabled = | |
294 | in->body.kvp_ip_val.dhcp_enabled; | |
a500e0e7 S |
295 | out->kvp_ip_val.addr_family = |
296 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
297 | } |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
303 | { | |
304 | struct hv_kvp_ip_msg *in = in_msg; | |
305 | struct hv_kvp_msg *out = out_msg; | |
306 | ||
307 | switch (op) { | |
308 | case KVP_OP_SET_IP_INFO: | |
309 | /* | |
310 | * Transform all parameters into utf8 encoding. | |
311 | */ | |
312 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
313 | MAX_IP_ADDR_SIZE, | |
314 | UTF16_LITTLE_ENDIAN, | |
315 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
316 | MAX_IP_ADDR_SIZE); | |
317 | ||
318 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
319 | MAX_IP_ADDR_SIZE, | |
320 | UTF16_LITTLE_ENDIAN, | |
321 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
322 | MAX_IP_ADDR_SIZE); | |
323 | ||
324 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
325 | MAX_GATEWAY_SIZE, | |
326 | UTF16_LITTLE_ENDIAN, | |
327 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
328 | MAX_GATEWAY_SIZE); | |
329 | ||
330 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
331 | MAX_IP_ADDR_SIZE, | |
332 | UTF16_LITTLE_ENDIAN, | |
333 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
334 | MAX_IP_ADDR_SIZE); | |
335 | ||
336 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
337 | ||
338 | default: | |
339 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
340 | MAX_ADAPTER_ID_SIZE, | |
341 | UTF16_LITTLE_ENDIAN, | |
342 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
343 | MAX_ADAPTER_ID_SIZE); | |
344 | ||
345 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
346 | } | |
347 | } | |
348 | ||
349 | ||
350 | ||
351 | ||
e2bb6537 S |
352 | static void |
353 | kvp_send_key(struct work_struct *dummy) | |
245ba56a | 354 | { |
26403354 | 355 | struct hv_kvp_msg *message; |
fa3d5b85 S |
356 | struct hv_kvp_msg *in_msg; |
357 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
358 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
359 | __u32 val32; | |
360 | __u64 val64; | |
8d9560eb | 361 | int rc; |
245ba56a | 362 | |
97bf16cd VK |
363 | /* The transaction state is wrong. */ |
364 | if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) | |
365 | return; | |
366 | ||
11bc3a5f | 367 | message = kzalloc(sizeof(*message), GFP_KERNEL); |
b36fda33 VK |
368 | if (!message) |
369 | return; | |
370 | ||
fa3d5b85 S |
371 | message->kvp_hdr.operation = operation; |
372 | message->kvp_hdr.pool = pool; | |
373 | in_msg = kvp_transaction.kvp_msg; | |
374 | ||
375 | /* | |
376 | * The key/value strings sent from the host are encoded in | |
377 | * in utf16; convert it to utf8 strings. | |
378 | * The host assures us that the utf16 strings will not exceed | |
379 | * the max lengths specified. We will however, reserve room | |
380 | * for the string terminating character - in the utf16s_utf8s() | |
381 | * function we limit the size of the buffer where the converted | |
382 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
383 | * that the strings can be properly terminated! | |
384 | */ | |
385 | ||
386 | switch (message->kvp_hdr.operation) { | |
03db7724 S |
387 | case KVP_OP_SET_IP_INFO: |
388 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
389 | break; | |
390 | case KVP_OP_GET_IP_INFO: | |
391 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
392 | break; | |
fa3d5b85 S |
393 | case KVP_OP_SET: |
394 | switch (in_msg->body.kvp_set.data.value_type) { | |
395 | case REG_SZ: | |
396 | /* | |
397 | * The value is a string - utf16 encoding. | |
398 | */ | |
399 | message->body.kvp_set.data.value_size = | |
400 | utf16s_to_utf8s( | |
401 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
402 | in_msg->body.kvp_set.data.value_size, | |
403 | UTF16_LITTLE_ENDIAN, | |
404 | message->body.kvp_set.data.value, | |
405 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
406 | break; | |
407 | ||
408 | case REG_U32: | |
409 | /* | |
410 | * The value is a 32 bit scalar. | |
411 | * We save this as a utf8 string. | |
412 | */ | |
413 | val32 = in_msg->body.kvp_set.data.value_u32; | |
414 | message->body.kvp_set.data.value_size = | |
415 | sprintf(message->body.kvp_set.data.value, | |
416 | "%d", val32) + 1; | |
417 | break; | |
418 | ||
419 | case REG_U64: | |
420 | /* | |
421 | * The value is a 64 bit scalar. | |
422 | * We save this as a utf8 string. | |
423 | */ | |
424 | val64 = in_msg->body.kvp_set.data.value_u64; | |
425 | message->body.kvp_set.data.value_size = | |
426 | sprintf(message->body.kvp_set.data.value, | |
427 | "%llu", val64) + 1; | |
428 | break; | |
429 | ||
430 | } | |
431 | case KVP_OP_GET: | |
432 | message->body.kvp_set.data.key_size = | |
433 | utf16s_to_utf8s( | |
434 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
435 | in_msg->body.kvp_set.data.key_size, | |
436 | UTF16_LITTLE_ENDIAN, | |
437 | message->body.kvp_set.data.key, | |
438 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
439 | break; | |
440 | ||
441 | case KVP_OP_DELETE: | |
442 | message->body.kvp_delete.key_size = | |
443 | utf16s_to_utf8s( | |
444 | (wchar_t *)in_msg->body.kvp_delete.key, | |
445 | in_msg->body.kvp_delete.key_size, | |
446 | UTF16_LITTLE_ENDIAN, | |
447 | message->body.kvp_delete.key, | |
448 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
449 | break; | |
450 | ||
451 | case KVP_OP_ENUMERATE: | |
452 | message->body.kvp_enum_data.index = | |
453 | in_msg->body.kvp_enum_data.index; | |
454 | break; | |
245ba56a | 455 | } |
fa3d5b85 | 456 | |
97bf16cd | 457 | kvp_transaction.state = HVUTIL_USERSPACE_REQ; |
11bc3a5f | 458 | rc = hvutil_transport_send(hvt, message, sizeof(*message)); |
8d9560eb VK |
459 | if (rc) { |
460 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
97bf16cd | 461 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
8d9560eb | 462 | kvp_respond_to_host(message, HV_E_FAIL); |
97bf16cd VK |
463 | kvp_transaction.state = HVUTIL_READY; |
464 | } | |
8d9560eb VK |
465 | } |
466 | ||
11bc3a5f | 467 | kfree(message); |
fa3d5b85 | 468 | |
e2bb6537 | 469 | return; |
245ba56a KS |
470 | } |
471 | ||
472 | /* | |
473 | * Send a response back to the host. | |
474 | */ | |
475 | ||
476 | static void | |
03db7724 | 477 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
478 | { |
479 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 480 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 481 | char *key_name; |
03db7724 | 482 | char *value; |
245ba56a | 483 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
484 | int keylen = 0; |
485 | int valuelen = 0; | |
245ba56a KS |
486 | u32 buf_len; |
487 | struct vmbus_channel *channel; | |
488 | u64 req_id; | |
03db7724 | 489 | int ret; |
245ba56a | 490 | |
245ba56a KS |
491 | /* |
492 | * Copy the global state for completing the transaction. Note that | |
493 | * only one transaction can be active at a time. | |
494 | */ | |
495 | ||
496 | buf_len = kvp_transaction.recv_len; | |
497 | channel = kvp_transaction.recv_channel; | |
498 | req_id = kvp_transaction.recv_req_id; | |
499 | ||
fa3d5b85 S |
500 | icmsghdrp = (struct icmsg_hdr *) |
501 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
502 | ||
4e65f6e8 S |
503 | if (channel->onchannel_callback == NULL) |
504 | /* | |
505 | * We have raced with util driver being unloaded; | |
506 | * silently return. | |
507 | */ | |
508 | return; | |
509 | ||
b47a81dc | 510 | icmsghdrp->status = error; |
245ba56a KS |
511 | |
512 | /* | |
adc80ae6 S |
513 | * If the error parameter is set, terminate the host's enumeration |
514 | * on this pool. | |
245ba56a KS |
515 | */ |
516 | if (error) { | |
517 | /* | |
b47a81dc S |
518 | * Something failed or we have timedout; |
519 | * terminate the current host-side iteration. | |
245ba56a | 520 | */ |
245ba56a KS |
521 | goto response_done; |
522 | } | |
523 | ||
fa3d5b85 S |
524 | kvp_msg = (struct hv_kvp_msg *) |
525 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
526 | sizeof(struct icmsg_hdr)]; | |
527 | ||
528 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
03db7724 S |
529 | case KVP_OP_GET_IP_INFO: |
530 | ret = process_ob_ipinfo(msg_to_host, | |
531 | (struct hv_kvp_ip_msg *)kvp_msg, | |
532 | KVP_OP_GET_IP_INFO); | |
533 | if (ret < 0) | |
534 | icmsghdrp->status = HV_E_FAIL; | |
535 | ||
536 | goto response_done; | |
537 | case KVP_OP_SET_IP_INFO: | |
538 | goto response_done; | |
fa3d5b85 S |
539 | case KVP_OP_GET: |
540 | kvp_data = &kvp_msg->body.kvp_get.data; | |
541 | goto copy_value; | |
542 | ||
543 | case KVP_OP_SET: | |
544 | case KVP_OP_DELETE: | |
545 | goto response_done; | |
546 | ||
547 | default: | |
548 | break; | |
549 | } | |
550 | ||
551 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
03db7724 | 552 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 553 | |
245ba56a KS |
554 | /* |
555 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
556 | * in utf16. Ensure that the key/value size reported to the host |
557 | * will be less than or equal to the MAX size (including the | |
558 | * terminating character). | |
245ba56a | 559 | */ |
0720a06a | 560 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
561 | (wchar_t *) kvp_data->key, |
562 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
563 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
564 | ||
565 | copy_value: | |
03db7724 | 566 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 567 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
568 | (wchar_t *) kvp_data->value, |
569 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
570 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
245ba56a | 571 | |
fa3d5b85 S |
572 | /* |
573 | * If the utf8s to utf16s conversion failed; notify host | |
574 | * of the error. | |
575 | */ | |
576 | if ((keylen < 0) || (valuelen < 0)) | |
577 | icmsghdrp->status = HV_E_FAIL; | |
578 | ||
579 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
245ba56a KS |
580 | |
581 | response_done: | |
582 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
583 | ||
584 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 585 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
586 | } |
587 | ||
588 | /* | |
589 | * This callback is invoked when we get a KVP message from the host. | |
590 | * The host ensures that only one KVP transaction can be active at a time. | |
591 | * KVP implementation in Linux needs to forward the key to a user-mde | |
592 | * component to retrive the corresponding value. Consequently, we cannot | |
593 | * respond to the host in the conext of this callback. Since the host | |
594 | * guarantees that at most only one transaction can be active at a time, | |
595 | * we stash away the transaction state in a set of global variables. | |
596 | */ | |
597 | ||
598 | void hv_kvp_onchannelcallback(void *context) | |
599 | { | |
600 | struct vmbus_channel *channel = context; | |
601 | u32 recvlen; | |
602 | u64 requestid; | |
603 | ||
604 | struct hv_kvp_msg *kvp_msg; | |
245ba56a KS |
605 | |
606 | struct icmsg_hdr *icmsghdrp; | |
607 | struct icmsg_negotiate *negop = NULL; | |
3a491605 S |
608 | int util_fw_version; |
609 | int kvp_srv_version; | |
4dbfc2e6 VK |
610 | static enum {NEGO_NOT_STARTED, |
611 | NEGO_IN_PROGRESS, | |
612 | NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; | |
245ba56a | 613 | |
4dbfc2e6 VK |
614 | if (host_negotiatied == NEGO_NOT_STARTED && |
615 | kvp_transaction.state < HVUTIL_READY) { | |
616 | /* | |
617 | * If userspace daemon is not connected and host is asking | |
618 | * us to negotiate we need to delay to not lose messages. | |
619 | * This is important for Failover IP setting. | |
620 | */ | |
621 | host_negotiatied = NEGO_IN_PROGRESS; | |
622 | schedule_delayed_work(&kvp_host_handshake_work, | |
623 | HV_UTIL_NEGO_TIMEOUT * HZ); | |
624 | return; | |
625 | } | |
3cace4a6 | 626 | if (kvp_transaction.state > HVUTIL_READY) |
fa3d5b85 | 627 | return; |
245ba56a | 628 | |
9bd2d0df | 629 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, |
03db7724 | 630 | &requestid); |
245ba56a KS |
631 | |
632 | if (recvlen > 0) { | |
245ba56a KS |
633 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
634 | sizeof(struct vmbuspipe_hdr)]; | |
635 | ||
636 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
6741335b | 637 | /* |
3a491605 S |
638 | * Based on the host, select appropriate |
639 | * framework and service versions we will | |
640 | * negotiate. | |
6741335b | 641 | */ |
3a491605 S |
642 | switch (vmbus_proto_version) { |
643 | case (VERSION_WS2008): | |
644 | util_fw_version = UTIL_WS2K8_FW_VERSION; | |
645 | kvp_srv_version = WS2008_SRV_VERSION; | |
646 | break; | |
647 | case (VERSION_WIN7): | |
648 | util_fw_version = UTIL_FW_VERSION; | |
649 | kvp_srv_version = WIN7_SRV_VERSION; | |
650 | break; | |
651 | default: | |
652 | util_fw_version = UTIL_FW_VERSION; | |
653 | kvp_srv_version = WIN8_SRV_VERSION; | |
654 | } | |
c836d0ab | 655 | vmbus_prep_negotiate_resp(icmsghdrp, negop, |
3a491605 S |
656 | recv_buffer, util_fw_version, |
657 | kvp_srv_version); | |
6741335b | 658 | |
245ba56a KS |
659 | } else { |
660 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
661 | sizeof(struct vmbuspipe_hdr) + | |
662 | sizeof(struct icmsg_hdr)]; | |
663 | ||
245ba56a KS |
664 | /* |
665 | * Stash away this global state for completing the | |
666 | * transaction; note transactions are serialized. | |
667 | */ | |
fa3d5b85 | 668 | |
245ba56a | 669 | kvp_transaction.recv_len = recvlen; |
245ba56a | 670 | kvp_transaction.recv_req_id = requestid; |
fa3d5b85 | 671 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a | 672 | |
97bf16cd VK |
673 | if (kvp_transaction.state < HVUTIL_READY) { |
674 | /* Userspace is not registered yet */ | |
675 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
676 | return; | |
677 | } | |
678 | kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
679 | ||
245ba56a KS |
680 | /* |
681 | * Get the information from the | |
682 | * user-mode component. | |
683 | * component. This transaction will be | |
684 | * completed when we get the value from | |
685 | * the user-mode component. | |
686 | * Set a timeout to deal with | |
687 | * user-mode not responding. | |
688 | */ | |
e2bb6537 | 689 | schedule_work(&kvp_sendkey_work); |
c0b200cf S |
690 | schedule_delayed_work(&kvp_timeout_work, |
691 | HV_UTIL_TIMEOUT * HZ); | |
245ba56a KS |
692 | |
693 | return; | |
694 | ||
695 | } | |
696 | ||
245ba56a KS |
697 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
698 | | ICMSGHDRFLAG_RESPONSE; | |
699 | ||
700 | vmbus_sendpacket(channel, recv_buffer, | |
701 | recvlen, requestid, | |
415f2287 | 702 | VM_PKT_DATA_INBAND, 0); |
4dbfc2e6 VK |
703 | |
704 | host_negotiatied = NEGO_FINISHED; | |
245ba56a KS |
705 | } |
706 | ||
707 | } | |
708 | ||
11bc3a5f VK |
709 | static void kvp_on_reset(void) |
710 | { | |
711 | if (cancel_delayed_work_sync(&kvp_timeout_work)) | |
712 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
713 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
714 | } | |
715 | ||
245ba56a | 716 | int |
a29b643c | 717 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a | 718 | { |
a29b643c | 719 | recv_buffer = srv->recv_buffer; |
b9830d12 | 720 | kvp_transaction.recv_channel = srv->channel; |
245ba56a | 721 | |
fa3d5b85 S |
722 | /* |
723 | * When this driver loads, the user level daemon that | |
724 | * processes the host requests may not yet be running. | |
725 | * Defer processing channel callbacks until the daemon | |
726 | * has registered. | |
727 | */ | |
97bf16cd | 728 | kvp_transaction.state = HVUTIL_DEVICE_INIT; |
fa3d5b85 | 729 | |
11bc3a5f VK |
730 | hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, |
731 | kvp_on_msg, kvp_on_reset); | |
732 | if (!hvt) | |
733 | return -EFAULT; | |
734 | ||
245ba56a KS |
735 | return 0; |
736 | } | |
737 | ||
738 | void hv_kvp_deinit(void) | |
739 | { | |
97bf16cd | 740 | kvp_transaction.state = HVUTIL_DEVICE_DYING; |
4dbfc2e6 | 741 | cancel_delayed_work_sync(&kvp_host_handshake_work); |
68c8b39a | 742 | cancel_delayed_work_sync(&kvp_timeout_work); |
e2bb6537 | 743 | cancel_work_sync(&kvp_sendkey_work); |
11bc3a5f | 744 | hvutil_transport_destroy(hvt); |
245ba56a | 745 | } |