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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 | ||
e0fa3e5e VK |
105 | static void kvp_register_done(void) |
106 | { | |
107 | /* | |
108 | * If we're still negotiating with the host cancel the timeout | |
109 | * work to not poll the channel twice. | |
110 | */ | |
111 | pr_debug("KVP: userspace daemon registered\n"); | |
112 | cancel_delayed_work_sync(&kvp_host_handshake_work); | |
113 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); | |
114 | } | |
115 | ||
245ba56a | 116 | static void |
b47a81dc | 117 | kvp_register(int reg_value) |
245ba56a KS |
118 | { |
119 | ||
26403354 S |
120 | struct hv_kvp_msg *kvp_msg; |
121 | char *version; | |
245ba56a | 122 | |
11bc3a5f | 123 | kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); |
245ba56a | 124 | |
11bc3a5f | 125 | if (kvp_msg) { |
e485ceac | 126 | version = kvp_msg->body.kvp_register.version; |
b47a81dc | 127 | kvp_msg->kvp_hdr.operation = reg_value; |
26403354 | 128 | strcpy(version, HV_DRV_VERSION); |
11bc3a5f | 129 | |
e0fa3e5e VK |
130 | hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg), |
131 | kvp_register_done); | |
11bc3a5f | 132 | kfree(kvp_msg); |
245ba56a KS |
133 | } |
134 | } | |
68c8b39a VK |
135 | |
136 | static void kvp_timeout_func(struct work_struct *dummy) | |
245ba56a KS |
137 | { |
138 | /* | |
139 | * If the timer fires, the user-mode component has not responded; | |
140 | * process the pending transaction. | |
141 | */ | |
03db7724 | 142 | kvp_respond_to_host(NULL, HV_E_FAIL); |
97bf16cd | 143 | |
3cace4a6 | 144 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
b47a81dc S |
145 | } |
146 | ||
4dbfc2e6 VK |
147 | static void kvp_host_handshake_func(struct work_struct *dummy) |
148 | { | |
149 | hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback); | |
150 | } | |
151 | ||
b47a81dc S |
152 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) |
153 | { | |
b47a81dc S |
154 | switch (msg->kvp_hdr.operation) { |
155 | case KVP_OP_REGISTER: | |
156 | dm_reg_value = KVP_OP_REGISTER; | |
157 | pr_info("KVP: IP injection functionality not available\n"); | |
158 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
159 | break; | |
160 | case KVP_OP_REGISTER1: | |
161 | dm_reg_value = KVP_OP_REGISTER1; | |
162 | break; | |
163 | default: | |
164 | pr_info("KVP: incompatible daemon\n"); | |
165 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
166 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
11bc3a5f | 167 | return -EINVAL; |
b47a81dc S |
168 | } |
169 | ||
11bc3a5f VK |
170 | /* |
171 | * We have a compatible daemon; complete the handshake. | |
172 | */ | |
e0fa3e5e VK |
173 | pr_debug("KVP: userspace daemon ver. %d connected\n", |
174 | msg->kvp_hdr.operation); | |
11bc3a5f | 175 | kvp_register(dm_reg_value); |
4dbfc2e6 | 176 | |
11bc3a5f | 177 | return 0; |
245ba56a KS |
178 | } |
179 | ||
b47a81dc | 180 | |
245ba56a KS |
181 | /* |
182 | * Callback when data is received from user mode. | |
183 | */ | |
184 | ||
11bc3a5f | 185 | static int kvp_on_msg(void *msg, int len) |
245ba56a | 186 | { |
11bc3a5f | 187 | struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; |
26403354 | 188 | struct hv_kvp_msg_enumerate *data; |
b47a81dc | 189 | int error = 0; |
245ba56a | 190 | |
11bc3a5f VK |
191 | if (len < sizeof(*message)) |
192 | return -EINVAL; | |
b47a81dc S |
193 | |
194 | /* | |
195 | * If we are negotiating the version information | |
196 | * with the daemon; handle that first. | |
197 | */ | |
198 | ||
97bf16cd | 199 | if (kvp_transaction.state < HVUTIL_READY) { |
11bc3a5f | 200 | return kvp_handle_handshake(message); |
b47a81dc S |
201 | } |
202 | ||
97bf16cd VK |
203 | /* We didn't send anything to userspace so the reply is spurious */ |
204 | if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) | |
11bc3a5f VK |
205 | return -EINVAL; |
206 | ||
97bf16cd VK |
207 | kvp_transaction.state = HVUTIL_USERSPACE_RECV; |
208 | ||
b47a81dc S |
209 | /* |
210 | * Based on the version of the daemon, we propagate errors from the | |
211 | * daemon differently. | |
212 | */ | |
213 | ||
214 | data = &message->body.kvp_enum_data; | |
215 | ||
216 | switch (dm_reg_value) { | |
fa3d5b85 | 217 | case KVP_OP_REGISTER: |
b47a81dc S |
218 | /* |
219 | * Null string is used to pass back error condition. | |
220 | */ | |
221 | if (data->data.key[0] == 0) | |
222 | error = HV_S_CONT; | |
fa3d5b85 | 223 | break; |
245ba56a | 224 | |
b47a81dc | 225 | case KVP_OP_REGISTER1: |
245ba56a | 226 | /* |
b47a81dc S |
227 | * We use the message header information from |
228 | * the user level daemon to transmit errors. | |
245ba56a | 229 | */ |
b47a81dc S |
230 | error = message->error; |
231 | break; | |
245ba56a | 232 | } |
b47a81dc S |
233 | |
234 | /* | |
235 | * Complete the transaction by forwarding the key value | |
236 | * to the host. But first, cancel the timeout. | |
237 | */ | |
97bf16cd | 238 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
03db7724 | 239 | kvp_respond_to_host(message, error); |
3cace4a6 | 240 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
97bf16cd | 241 | } |
11bc3a5f VK |
242 | |
243 | return 0; | |
245ba56a KS |
244 | } |
245 | ||
03db7724 S |
246 | |
247 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
248 | { | |
249 | struct hv_kvp_msg *in = in_msg; | |
250 | struct hv_kvp_ip_msg *out = out_msg; | |
251 | int len; | |
252 | ||
253 | switch (op) { | |
254 | case KVP_OP_GET_IP_INFO: | |
255 | /* | |
256 | * Transform all parameters into utf16 encoding. | |
257 | */ | |
258 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
259 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
260 | UTF16_HOST_ENDIAN, | |
261 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
262 | MAX_IP_ADDR_SIZE); | |
263 | if (len < 0) | |
264 | return len; | |
265 | ||
266 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
267 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
268 | UTF16_HOST_ENDIAN, | |
269 | (wchar_t *)out->kvp_ip_val.sub_net, | |
270 | MAX_IP_ADDR_SIZE); | |
271 | if (len < 0) | |
272 | return len; | |
273 | ||
274 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
275 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
276 | UTF16_HOST_ENDIAN, | |
277 | (wchar_t *)out->kvp_ip_val.gate_way, | |
278 | MAX_GATEWAY_SIZE); | |
279 | if (len < 0) | |
280 | return len; | |
281 | ||
282 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
283 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
284 | UTF16_HOST_ENDIAN, | |
285 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
286 | MAX_IP_ADDR_SIZE); | |
287 | if (len < 0) | |
288 | return len; | |
289 | ||
290 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
291 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
292 | UTF16_HOST_ENDIAN, | |
293 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
294 | MAX_IP_ADDR_SIZE); | |
295 | if (len < 0) | |
296 | return len; | |
297 | ||
298 | out->kvp_ip_val.dhcp_enabled = | |
299 | in->body.kvp_ip_val.dhcp_enabled; | |
a500e0e7 S |
300 | out->kvp_ip_val.addr_family = |
301 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
302 | } |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
308 | { | |
309 | struct hv_kvp_ip_msg *in = in_msg; | |
310 | struct hv_kvp_msg *out = out_msg; | |
311 | ||
312 | switch (op) { | |
313 | case KVP_OP_SET_IP_INFO: | |
314 | /* | |
315 | * Transform all parameters into utf8 encoding. | |
316 | */ | |
317 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
318 | MAX_IP_ADDR_SIZE, | |
319 | UTF16_LITTLE_ENDIAN, | |
320 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
321 | MAX_IP_ADDR_SIZE); | |
322 | ||
323 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
324 | MAX_IP_ADDR_SIZE, | |
325 | UTF16_LITTLE_ENDIAN, | |
326 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
327 | MAX_IP_ADDR_SIZE); | |
328 | ||
329 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
330 | MAX_GATEWAY_SIZE, | |
331 | UTF16_LITTLE_ENDIAN, | |
332 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
333 | MAX_GATEWAY_SIZE); | |
334 | ||
335 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
336 | MAX_IP_ADDR_SIZE, | |
337 | UTF16_LITTLE_ENDIAN, | |
338 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
339 | MAX_IP_ADDR_SIZE); | |
340 | ||
341 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
342 | ||
343 | default: | |
344 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
345 | MAX_ADAPTER_ID_SIZE, | |
346 | UTF16_LITTLE_ENDIAN, | |
347 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
348 | MAX_ADAPTER_ID_SIZE); | |
349 | ||
350 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
351 | } | |
352 | } | |
353 | ||
354 | ||
355 | ||
356 | ||
e2bb6537 S |
357 | static void |
358 | kvp_send_key(struct work_struct *dummy) | |
245ba56a | 359 | { |
26403354 | 360 | struct hv_kvp_msg *message; |
fa3d5b85 S |
361 | struct hv_kvp_msg *in_msg; |
362 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
363 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
364 | __u32 val32; | |
365 | __u64 val64; | |
8d9560eb | 366 | int rc; |
245ba56a | 367 | |
97bf16cd VK |
368 | /* The transaction state is wrong. */ |
369 | if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) | |
370 | return; | |
371 | ||
11bc3a5f | 372 | message = kzalloc(sizeof(*message), GFP_KERNEL); |
b36fda33 VK |
373 | if (!message) |
374 | return; | |
375 | ||
fa3d5b85 S |
376 | message->kvp_hdr.operation = operation; |
377 | message->kvp_hdr.pool = pool; | |
378 | in_msg = kvp_transaction.kvp_msg; | |
379 | ||
380 | /* | |
381 | * The key/value strings sent from the host are encoded in | |
382 | * in utf16; convert it to utf8 strings. | |
383 | * The host assures us that the utf16 strings will not exceed | |
384 | * the max lengths specified. We will however, reserve room | |
385 | * for the string terminating character - in the utf16s_utf8s() | |
386 | * function we limit the size of the buffer where the converted | |
387 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
388 | * that the strings can be properly terminated! | |
389 | */ | |
390 | ||
391 | switch (message->kvp_hdr.operation) { | |
03db7724 S |
392 | case KVP_OP_SET_IP_INFO: |
393 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
394 | break; | |
395 | case KVP_OP_GET_IP_INFO: | |
396 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
397 | break; | |
fa3d5b85 S |
398 | case KVP_OP_SET: |
399 | switch (in_msg->body.kvp_set.data.value_type) { | |
400 | case REG_SZ: | |
401 | /* | |
402 | * The value is a string - utf16 encoding. | |
403 | */ | |
404 | message->body.kvp_set.data.value_size = | |
405 | utf16s_to_utf8s( | |
406 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
407 | in_msg->body.kvp_set.data.value_size, | |
408 | UTF16_LITTLE_ENDIAN, | |
409 | message->body.kvp_set.data.value, | |
410 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
411 | break; | |
412 | ||
413 | case REG_U32: | |
414 | /* | |
415 | * The value is a 32 bit scalar. | |
416 | * We save this as a utf8 string. | |
417 | */ | |
418 | val32 = in_msg->body.kvp_set.data.value_u32; | |
419 | message->body.kvp_set.data.value_size = | |
420 | sprintf(message->body.kvp_set.data.value, | |
421 | "%d", val32) + 1; | |
422 | break; | |
423 | ||
424 | case REG_U64: | |
425 | /* | |
426 | * The value is a 64 bit scalar. | |
427 | * We save this as a utf8 string. | |
428 | */ | |
429 | val64 = in_msg->body.kvp_set.data.value_u64; | |
430 | message->body.kvp_set.data.value_size = | |
431 | sprintf(message->body.kvp_set.data.value, | |
432 | "%llu", val64) + 1; | |
433 | break; | |
434 | ||
435 | } | |
436 | case KVP_OP_GET: | |
437 | message->body.kvp_set.data.key_size = | |
438 | utf16s_to_utf8s( | |
439 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
440 | in_msg->body.kvp_set.data.key_size, | |
441 | UTF16_LITTLE_ENDIAN, | |
442 | message->body.kvp_set.data.key, | |
443 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
444 | break; | |
445 | ||
446 | case KVP_OP_DELETE: | |
447 | message->body.kvp_delete.key_size = | |
448 | utf16s_to_utf8s( | |
449 | (wchar_t *)in_msg->body.kvp_delete.key, | |
450 | in_msg->body.kvp_delete.key_size, | |
451 | UTF16_LITTLE_ENDIAN, | |
452 | message->body.kvp_delete.key, | |
453 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
454 | break; | |
455 | ||
456 | case KVP_OP_ENUMERATE: | |
457 | message->body.kvp_enum_data.index = | |
458 | in_msg->body.kvp_enum_data.index; | |
459 | break; | |
245ba56a | 460 | } |
fa3d5b85 | 461 | |
97bf16cd | 462 | kvp_transaction.state = HVUTIL_USERSPACE_REQ; |
e0fa3e5e | 463 | rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL); |
8d9560eb VK |
464 | if (rc) { |
465 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
97bf16cd | 466 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
8d9560eb | 467 | kvp_respond_to_host(message, HV_E_FAIL); |
97bf16cd VK |
468 | kvp_transaction.state = HVUTIL_READY; |
469 | } | |
8d9560eb VK |
470 | } |
471 | ||
11bc3a5f | 472 | kfree(message); |
fa3d5b85 | 473 | |
e2bb6537 | 474 | return; |
245ba56a KS |
475 | } |
476 | ||
477 | /* | |
478 | * Send a response back to the host. | |
479 | */ | |
480 | ||
481 | static void | |
03db7724 | 482 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
483 | { |
484 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 485 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 486 | char *key_name; |
03db7724 | 487 | char *value; |
245ba56a | 488 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
489 | int keylen = 0; |
490 | int valuelen = 0; | |
245ba56a KS |
491 | u32 buf_len; |
492 | struct vmbus_channel *channel; | |
493 | u64 req_id; | |
03db7724 | 494 | int ret; |
245ba56a | 495 | |
245ba56a KS |
496 | /* |
497 | * Copy the global state for completing the transaction. Note that | |
498 | * only one transaction can be active at a time. | |
499 | */ | |
500 | ||
501 | buf_len = kvp_transaction.recv_len; | |
502 | channel = kvp_transaction.recv_channel; | |
503 | req_id = kvp_transaction.recv_req_id; | |
504 | ||
fa3d5b85 S |
505 | icmsghdrp = (struct icmsg_hdr *) |
506 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
507 | ||
4e65f6e8 S |
508 | if (channel->onchannel_callback == NULL) |
509 | /* | |
510 | * We have raced with util driver being unloaded; | |
511 | * silently return. | |
512 | */ | |
513 | return; | |
514 | ||
b47a81dc | 515 | icmsghdrp->status = error; |
245ba56a KS |
516 | |
517 | /* | |
adc80ae6 S |
518 | * If the error parameter is set, terminate the host's enumeration |
519 | * on this pool. | |
245ba56a KS |
520 | */ |
521 | if (error) { | |
522 | /* | |
b47a81dc S |
523 | * Something failed or we have timedout; |
524 | * terminate the current host-side iteration. | |
245ba56a | 525 | */ |
245ba56a KS |
526 | goto response_done; |
527 | } | |
528 | ||
fa3d5b85 S |
529 | kvp_msg = (struct hv_kvp_msg *) |
530 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
531 | sizeof(struct icmsg_hdr)]; | |
532 | ||
533 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
03db7724 S |
534 | case KVP_OP_GET_IP_INFO: |
535 | ret = process_ob_ipinfo(msg_to_host, | |
536 | (struct hv_kvp_ip_msg *)kvp_msg, | |
537 | KVP_OP_GET_IP_INFO); | |
538 | if (ret < 0) | |
539 | icmsghdrp->status = HV_E_FAIL; | |
540 | ||
541 | goto response_done; | |
542 | case KVP_OP_SET_IP_INFO: | |
543 | goto response_done; | |
fa3d5b85 S |
544 | case KVP_OP_GET: |
545 | kvp_data = &kvp_msg->body.kvp_get.data; | |
546 | goto copy_value; | |
547 | ||
548 | case KVP_OP_SET: | |
549 | case KVP_OP_DELETE: | |
550 | goto response_done; | |
551 | ||
552 | default: | |
553 | break; | |
554 | } | |
555 | ||
556 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
03db7724 | 557 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 558 | |
245ba56a KS |
559 | /* |
560 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
561 | * in utf16. Ensure that the key/value size reported to the host |
562 | * will be less than or equal to the MAX size (including the | |
563 | * terminating character). | |
245ba56a | 564 | */ |
0720a06a | 565 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
566 | (wchar_t *) kvp_data->key, |
567 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
568 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
569 | ||
570 | copy_value: | |
03db7724 | 571 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 572 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
573 | (wchar_t *) kvp_data->value, |
574 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
575 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
245ba56a | 576 | |
fa3d5b85 S |
577 | /* |
578 | * If the utf8s to utf16s conversion failed; notify host | |
579 | * of the error. | |
580 | */ | |
581 | if ((keylen < 0) || (valuelen < 0)) | |
582 | icmsghdrp->status = HV_E_FAIL; | |
583 | ||
584 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
245ba56a KS |
585 | |
586 | response_done: | |
587 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
588 | ||
589 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 590 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
591 | } |
592 | ||
593 | /* | |
594 | * This callback is invoked when we get a KVP message from the host. | |
595 | * The host ensures that only one KVP transaction can be active at a time. | |
596 | * KVP implementation in Linux needs to forward the key to a user-mde | |
597 | * component to retrive the corresponding value. Consequently, we cannot | |
598 | * respond to the host in the conext of this callback. Since the host | |
599 | * guarantees that at most only one transaction can be active at a time, | |
600 | * we stash away the transaction state in a set of global variables. | |
601 | */ | |
602 | ||
603 | void hv_kvp_onchannelcallback(void *context) | |
604 | { | |
605 | struct vmbus_channel *channel = context; | |
606 | u32 recvlen; | |
607 | u64 requestid; | |
608 | ||
609 | struct hv_kvp_msg *kvp_msg; | |
245ba56a KS |
610 | |
611 | struct icmsg_hdr *icmsghdrp; | |
612 | struct icmsg_negotiate *negop = NULL; | |
3a491605 S |
613 | int util_fw_version; |
614 | int kvp_srv_version; | |
4dbfc2e6 VK |
615 | static enum {NEGO_NOT_STARTED, |
616 | NEGO_IN_PROGRESS, | |
617 | NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; | |
245ba56a | 618 | |
4dbfc2e6 VK |
619 | if (host_negotiatied == NEGO_NOT_STARTED && |
620 | kvp_transaction.state < HVUTIL_READY) { | |
621 | /* | |
622 | * If userspace daemon is not connected and host is asking | |
623 | * us to negotiate we need to delay to not lose messages. | |
624 | * This is important for Failover IP setting. | |
625 | */ | |
626 | host_negotiatied = NEGO_IN_PROGRESS; | |
627 | schedule_delayed_work(&kvp_host_handshake_work, | |
628 | HV_UTIL_NEGO_TIMEOUT * HZ); | |
629 | return; | |
630 | } | |
3cace4a6 | 631 | if (kvp_transaction.state > HVUTIL_READY) |
fa3d5b85 | 632 | return; |
245ba56a | 633 | |
9bd2d0df | 634 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, |
03db7724 | 635 | &requestid); |
245ba56a KS |
636 | |
637 | if (recvlen > 0) { | |
245ba56a KS |
638 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
639 | sizeof(struct vmbuspipe_hdr)]; | |
640 | ||
641 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
6741335b | 642 | /* |
3a491605 S |
643 | * Based on the host, select appropriate |
644 | * framework and service versions we will | |
645 | * negotiate. | |
6741335b | 646 | */ |
3a491605 S |
647 | switch (vmbus_proto_version) { |
648 | case (VERSION_WS2008): | |
649 | util_fw_version = UTIL_WS2K8_FW_VERSION; | |
650 | kvp_srv_version = WS2008_SRV_VERSION; | |
651 | break; | |
652 | case (VERSION_WIN7): | |
653 | util_fw_version = UTIL_FW_VERSION; | |
654 | kvp_srv_version = WIN7_SRV_VERSION; | |
655 | break; | |
656 | default: | |
657 | util_fw_version = UTIL_FW_VERSION; | |
658 | kvp_srv_version = WIN8_SRV_VERSION; | |
659 | } | |
c836d0ab | 660 | vmbus_prep_negotiate_resp(icmsghdrp, negop, |
3a491605 S |
661 | recv_buffer, util_fw_version, |
662 | kvp_srv_version); | |
6741335b | 663 | |
245ba56a KS |
664 | } else { |
665 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
666 | sizeof(struct vmbuspipe_hdr) + | |
667 | sizeof(struct icmsg_hdr)]; | |
668 | ||
245ba56a KS |
669 | /* |
670 | * Stash away this global state for completing the | |
671 | * transaction; note transactions are serialized. | |
672 | */ | |
fa3d5b85 | 673 | |
245ba56a | 674 | kvp_transaction.recv_len = recvlen; |
245ba56a | 675 | kvp_transaction.recv_req_id = requestid; |
fa3d5b85 | 676 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a | 677 | |
97bf16cd VK |
678 | if (kvp_transaction.state < HVUTIL_READY) { |
679 | /* Userspace is not registered yet */ | |
680 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
681 | return; | |
682 | } | |
683 | kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
684 | ||
245ba56a KS |
685 | /* |
686 | * Get the information from the | |
687 | * user-mode component. | |
688 | * component. This transaction will be | |
689 | * completed when we get the value from | |
690 | * the user-mode component. | |
691 | * Set a timeout to deal with | |
692 | * user-mode not responding. | |
693 | */ | |
e2bb6537 | 694 | schedule_work(&kvp_sendkey_work); |
c0b200cf S |
695 | schedule_delayed_work(&kvp_timeout_work, |
696 | HV_UTIL_TIMEOUT * HZ); | |
245ba56a KS |
697 | |
698 | return; | |
699 | ||
700 | } | |
701 | ||
245ba56a KS |
702 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
703 | | ICMSGHDRFLAG_RESPONSE; | |
704 | ||
705 | vmbus_sendpacket(channel, recv_buffer, | |
706 | recvlen, requestid, | |
415f2287 | 707 | VM_PKT_DATA_INBAND, 0); |
4dbfc2e6 VK |
708 | |
709 | host_negotiatied = NEGO_FINISHED; | |
245ba56a KS |
710 | } |
711 | ||
712 | } | |
713 | ||
11bc3a5f VK |
714 | static void kvp_on_reset(void) |
715 | { | |
716 | if (cancel_delayed_work_sync(&kvp_timeout_work)) | |
717 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
718 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
719 | } | |
720 | ||
245ba56a | 721 | int |
a29b643c | 722 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a | 723 | { |
a29b643c | 724 | recv_buffer = srv->recv_buffer; |
b9830d12 | 725 | kvp_transaction.recv_channel = srv->channel; |
245ba56a | 726 | |
fa3d5b85 S |
727 | /* |
728 | * When this driver loads, the user level daemon that | |
729 | * processes the host requests may not yet be running. | |
730 | * Defer processing channel callbacks until the daemon | |
731 | * has registered. | |
732 | */ | |
97bf16cd | 733 | kvp_transaction.state = HVUTIL_DEVICE_INIT; |
fa3d5b85 | 734 | |
11bc3a5f VK |
735 | hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, |
736 | kvp_on_msg, kvp_on_reset); | |
737 | if (!hvt) | |
738 | return -EFAULT; | |
739 | ||
245ba56a KS |
740 | return 0; |
741 | } | |
742 | ||
743 | void hv_kvp_deinit(void) | |
744 | { | |
97bf16cd | 745 | kvp_transaction.state = HVUTIL_DEVICE_DYING; |
4dbfc2e6 | 746 | cancel_delayed_work_sync(&kvp_host_handshake_work); |
68c8b39a | 747 | cancel_delayed_work_sync(&kvp_timeout_work); |
e2bb6537 | 748 | cancel_work_sync(&kvp_sendkey_work); |
11bc3a5f | 749 | hvutil_transport_destroy(hvt); |
245ba56a | 750 | } |