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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 | 48 | |
a1656454 AN |
49 | #define KVP_VER_COUNT 3 |
50 | static const int kvp_versions[] = { | |
51 | WIN8_SRV_VERSION, | |
52 | WIN7_SRV_VERSION, | |
53 | WS2008_SRV_VERSION | |
54 | }; | |
55 | ||
56 | #define FW_VER_COUNT 2 | |
57 | static const int fw_versions[] = { | |
58 | UTIL_FW_VERSION, | |
59 | UTIL_WS2K8_FW_VERSION | |
60 | }; | |
61 | ||
245ba56a | 62 | /* |
97bf16cd VK |
63 | * Global state maintained for transaction that is being processed. For a class |
64 | * of integration services, including the "KVP service", the specified protocol | |
65 | * is a "request/response" protocol which means that there can only be single | |
66 | * outstanding transaction from the host at any given point in time. We use | |
67 | * this to simplify memory management in this driver - we cache and process | |
68 | * only one message at a time. | |
245ba56a | 69 | * |
97bf16cd VK |
70 | * While the request/response protocol is guaranteed by the host, we further |
71 | * ensure this by serializing packet processing in this driver - we do not | |
72 | * read additional packets from the VMBUs until the current packet is fully | |
73 | * handled. | |
245ba56a KS |
74 | */ |
75 | ||
76 | static struct { | |
97bf16cd | 77 | int state; /* hvutil_device_state */ |
245ba56a | 78 | int recv_len; /* number of bytes received. */ |
fa3d5b85 | 79 | struct hv_kvp_msg *kvp_msg; /* current message */ |
245ba56a KS |
80 | struct vmbus_channel *recv_channel; /* chn we got the request */ |
81 | u64 recv_req_id; /* request ID. */ | |
82 | } kvp_transaction; | |
83 | ||
b47a81dc S |
84 | /* |
85 | * This state maintains the version number registered by the daemon. | |
86 | */ | |
87 | static int dm_reg_value; | |
88 | ||
e2bb6537 | 89 | static void kvp_send_key(struct work_struct *dummy); |
245ba56a | 90 | |
76e5f813 | 91 | |
03db7724 | 92 | static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); |
68c8b39a | 93 | static void kvp_timeout_func(struct work_struct *dummy); |
4dbfc2e6 | 94 | static void kvp_host_handshake_func(struct work_struct *dummy); |
b47a81dc | 95 | static void kvp_register(int); |
245ba56a | 96 | |
68c8b39a | 97 | static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); |
4dbfc2e6 | 98 | static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func); |
e2bb6537 | 99 | static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); |
245ba56a | 100 | |
11bc3a5f | 101 | static const char kvp_devname[] = "vmbus/hv_kvp"; |
245ba56a | 102 | static u8 *recv_buffer; |
11bc3a5f | 103 | static struct hvutil_transport *hvt; |
245ba56a KS |
104 | /* |
105 | * Register the kernel component with the user-level daemon. | |
106 | * As part of this registration, pass the LIC version number. | |
cfc25993 | 107 | * This number has no meaning, it satisfies the registration protocol. |
245ba56a | 108 | */ |
cfc25993 | 109 | #define HV_DRV_VERSION "3.1" |
245ba56a | 110 | |
3cace4a6 OH |
111 | static void kvp_poll_wrapper(void *channel) |
112 | { | |
113 | /* Transaction is finished, reset the state here to avoid races. */ | |
114 | kvp_transaction.state = HVUTIL_READY; | |
115 | hv_kvp_onchannelcallback(channel); | |
116 | } | |
117 | ||
e0fa3e5e VK |
118 | static void kvp_register_done(void) |
119 | { | |
120 | /* | |
121 | * If we're still negotiating with the host cancel the timeout | |
122 | * work to not poll the channel twice. | |
123 | */ | |
124 | pr_debug("KVP: userspace daemon registered\n"); | |
125 | cancel_delayed_work_sync(&kvp_host_handshake_work); | |
126 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); | |
127 | } | |
128 | ||
245ba56a | 129 | static void |
b47a81dc | 130 | kvp_register(int reg_value) |
245ba56a KS |
131 | { |
132 | ||
26403354 S |
133 | struct hv_kvp_msg *kvp_msg; |
134 | char *version; | |
245ba56a | 135 | |
11bc3a5f | 136 | kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); |
245ba56a | 137 | |
11bc3a5f | 138 | if (kvp_msg) { |
e485ceac | 139 | version = kvp_msg->body.kvp_register.version; |
b47a81dc | 140 | kvp_msg->kvp_hdr.operation = reg_value; |
26403354 | 141 | strcpy(version, HV_DRV_VERSION); |
11bc3a5f | 142 | |
e0fa3e5e VK |
143 | hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg), |
144 | kvp_register_done); | |
11bc3a5f | 145 | kfree(kvp_msg); |
245ba56a KS |
146 | } |
147 | } | |
68c8b39a VK |
148 | |
149 | static void kvp_timeout_func(struct work_struct *dummy) | |
245ba56a KS |
150 | { |
151 | /* | |
152 | * If the timer fires, the user-mode component has not responded; | |
153 | * process the pending transaction. | |
154 | */ | |
03db7724 | 155 | kvp_respond_to_host(NULL, HV_E_FAIL); |
97bf16cd | 156 | |
3cace4a6 | 157 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
b47a81dc S |
158 | } |
159 | ||
4dbfc2e6 VK |
160 | static void kvp_host_handshake_func(struct work_struct *dummy) |
161 | { | |
162 | hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback); | |
163 | } | |
164 | ||
b47a81dc S |
165 | static int kvp_handle_handshake(struct hv_kvp_msg *msg) |
166 | { | |
b47a81dc S |
167 | switch (msg->kvp_hdr.operation) { |
168 | case KVP_OP_REGISTER: | |
169 | dm_reg_value = KVP_OP_REGISTER; | |
170 | pr_info("KVP: IP injection functionality not available\n"); | |
171 | pr_info("KVP: Upgrade the KVP daemon\n"); | |
172 | break; | |
173 | case KVP_OP_REGISTER1: | |
174 | dm_reg_value = KVP_OP_REGISTER1; | |
175 | break; | |
176 | default: | |
177 | pr_info("KVP: incompatible daemon\n"); | |
178 | pr_info("KVP: KVP version: %d, Daemon version: %d\n", | |
179 | KVP_OP_REGISTER1, msg->kvp_hdr.operation); | |
11bc3a5f | 180 | return -EINVAL; |
b47a81dc S |
181 | } |
182 | ||
11bc3a5f VK |
183 | /* |
184 | * We have a compatible daemon; complete the handshake. | |
185 | */ | |
e0fa3e5e VK |
186 | pr_debug("KVP: userspace daemon ver. %d connected\n", |
187 | msg->kvp_hdr.operation); | |
11bc3a5f | 188 | kvp_register(dm_reg_value); |
4dbfc2e6 | 189 | |
11bc3a5f | 190 | return 0; |
245ba56a KS |
191 | } |
192 | ||
b47a81dc | 193 | |
245ba56a KS |
194 | /* |
195 | * Callback when data is received from user mode. | |
196 | */ | |
197 | ||
11bc3a5f | 198 | static int kvp_on_msg(void *msg, int len) |
245ba56a | 199 | { |
11bc3a5f | 200 | struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; |
26403354 | 201 | struct hv_kvp_msg_enumerate *data; |
b47a81dc | 202 | int error = 0; |
245ba56a | 203 | |
11bc3a5f VK |
204 | if (len < sizeof(*message)) |
205 | return -EINVAL; | |
b47a81dc S |
206 | |
207 | /* | |
208 | * If we are negotiating the version information | |
209 | * with the daemon; handle that first. | |
210 | */ | |
211 | ||
97bf16cd | 212 | if (kvp_transaction.state < HVUTIL_READY) { |
11bc3a5f | 213 | return kvp_handle_handshake(message); |
b47a81dc S |
214 | } |
215 | ||
97bf16cd VK |
216 | /* We didn't send anything to userspace so the reply is spurious */ |
217 | if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) | |
11bc3a5f VK |
218 | return -EINVAL; |
219 | ||
97bf16cd VK |
220 | kvp_transaction.state = HVUTIL_USERSPACE_RECV; |
221 | ||
b47a81dc S |
222 | /* |
223 | * Based on the version of the daemon, we propagate errors from the | |
224 | * daemon differently. | |
225 | */ | |
226 | ||
227 | data = &message->body.kvp_enum_data; | |
228 | ||
229 | switch (dm_reg_value) { | |
fa3d5b85 | 230 | case KVP_OP_REGISTER: |
b47a81dc S |
231 | /* |
232 | * Null string is used to pass back error condition. | |
233 | */ | |
234 | if (data->data.key[0] == 0) | |
235 | error = HV_S_CONT; | |
fa3d5b85 | 236 | break; |
245ba56a | 237 | |
b47a81dc | 238 | case KVP_OP_REGISTER1: |
245ba56a | 239 | /* |
b47a81dc S |
240 | * We use the message header information from |
241 | * the user level daemon to transmit errors. | |
245ba56a | 242 | */ |
b47a81dc S |
243 | error = message->error; |
244 | break; | |
245ba56a | 245 | } |
b47a81dc S |
246 | |
247 | /* | |
248 | * Complete the transaction by forwarding the key value | |
249 | * to the host. But first, cancel the timeout. | |
250 | */ | |
97bf16cd | 251 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
03db7724 | 252 | kvp_respond_to_host(message, error); |
3cace4a6 | 253 | hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
97bf16cd | 254 | } |
11bc3a5f VK |
255 | |
256 | return 0; | |
245ba56a KS |
257 | } |
258 | ||
03db7724 S |
259 | |
260 | static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) | |
261 | { | |
262 | struct hv_kvp_msg *in = in_msg; | |
263 | struct hv_kvp_ip_msg *out = out_msg; | |
264 | int len; | |
265 | ||
266 | switch (op) { | |
267 | case KVP_OP_GET_IP_INFO: | |
268 | /* | |
269 | * Transform all parameters into utf16 encoding. | |
270 | */ | |
271 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, | |
272 | strlen((char *)in->body.kvp_ip_val.ip_addr), | |
273 | UTF16_HOST_ENDIAN, | |
274 | (wchar_t *)out->kvp_ip_val.ip_addr, | |
275 | MAX_IP_ADDR_SIZE); | |
276 | if (len < 0) | |
277 | return len; | |
278 | ||
279 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, | |
280 | strlen((char *)in->body.kvp_ip_val.sub_net), | |
281 | UTF16_HOST_ENDIAN, | |
282 | (wchar_t *)out->kvp_ip_val.sub_net, | |
283 | MAX_IP_ADDR_SIZE); | |
284 | if (len < 0) | |
285 | return len; | |
286 | ||
287 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, | |
288 | strlen((char *)in->body.kvp_ip_val.gate_way), | |
289 | UTF16_HOST_ENDIAN, | |
290 | (wchar_t *)out->kvp_ip_val.gate_way, | |
291 | MAX_GATEWAY_SIZE); | |
292 | if (len < 0) | |
293 | return len; | |
294 | ||
295 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, | |
296 | strlen((char *)in->body.kvp_ip_val.dns_addr), | |
297 | UTF16_HOST_ENDIAN, | |
298 | (wchar_t *)out->kvp_ip_val.dns_addr, | |
299 | MAX_IP_ADDR_SIZE); | |
300 | if (len < 0) | |
301 | return len; | |
302 | ||
303 | len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, | |
304 | strlen((char *)in->body.kvp_ip_val.adapter_id), | |
305 | UTF16_HOST_ENDIAN, | |
306 | (wchar_t *)out->kvp_ip_val.adapter_id, | |
307 | MAX_IP_ADDR_SIZE); | |
308 | if (len < 0) | |
309 | return len; | |
310 | ||
311 | out->kvp_ip_val.dhcp_enabled = | |
312 | in->body.kvp_ip_val.dhcp_enabled; | |
a500e0e7 S |
313 | out->kvp_ip_val.addr_family = |
314 | in->body.kvp_ip_val.addr_family; | |
03db7724 S |
315 | } |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) | |
321 | { | |
322 | struct hv_kvp_ip_msg *in = in_msg; | |
323 | struct hv_kvp_msg *out = out_msg; | |
324 | ||
325 | switch (op) { | |
326 | case KVP_OP_SET_IP_INFO: | |
327 | /* | |
328 | * Transform all parameters into utf8 encoding. | |
329 | */ | |
330 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, | |
331 | MAX_IP_ADDR_SIZE, | |
332 | UTF16_LITTLE_ENDIAN, | |
333 | (__u8 *)out->body.kvp_ip_val.ip_addr, | |
334 | MAX_IP_ADDR_SIZE); | |
335 | ||
336 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, | |
337 | MAX_IP_ADDR_SIZE, | |
338 | UTF16_LITTLE_ENDIAN, | |
339 | (__u8 *)out->body.kvp_ip_val.sub_net, | |
340 | MAX_IP_ADDR_SIZE); | |
341 | ||
342 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, | |
343 | MAX_GATEWAY_SIZE, | |
344 | UTF16_LITTLE_ENDIAN, | |
345 | (__u8 *)out->body.kvp_ip_val.gate_way, | |
346 | MAX_GATEWAY_SIZE); | |
347 | ||
348 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, | |
349 | MAX_IP_ADDR_SIZE, | |
350 | UTF16_LITTLE_ENDIAN, | |
351 | (__u8 *)out->body.kvp_ip_val.dns_addr, | |
352 | MAX_IP_ADDR_SIZE); | |
353 | ||
354 | out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; | |
355 | ||
356 | default: | |
357 | utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, | |
358 | MAX_ADAPTER_ID_SIZE, | |
359 | UTF16_LITTLE_ENDIAN, | |
360 | (__u8 *)out->body.kvp_ip_val.adapter_id, | |
361 | MAX_ADAPTER_ID_SIZE); | |
362 | ||
363 | out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; | |
364 | } | |
365 | } | |
366 | ||
367 | ||
368 | ||
369 | ||
e2bb6537 S |
370 | static void |
371 | kvp_send_key(struct work_struct *dummy) | |
245ba56a | 372 | { |
26403354 | 373 | struct hv_kvp_msg *message; |
fa3d5b85 S |
374 | struct hv_kvp_msg *in_msg; |
375 | __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; | |
376 | __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; | |
377 | __u32 val32; | |
378 | __u64 val64; | |
8d9560eb | 379 | int rc; |
245ba56a | 380 | |
97bf16cd VK |
381 | /* The transaction state is wrong. */ |
382 | if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) | |
383 | return; | |
384 | ||
11bc3a5f | 385 | message = kzalloc(sizeof(*message), GFP_KERNEL); |
b36fda33 VK |
386 | if (!message) |
387 | return; | |
388 | ||
fa3d5b85 S |
389 | message->kvp_hdr.operation = operation; |
390 | message->kvp_hdr.pool = pool; | |
391 | in_msg = kvp_transaction.kvp_msg; | |
392 | ||
393 | /* | |
394 | * The key/value strings sent from the host are encoded in | |
395 | * in utf16; convert it to utf8 strings. | |
396 | * The host assures us that the utf16 strings will not exceed | |
397 | * the max lengths specified. We will however, reserve room | |
398 | * for the string terminating character - in the utf16s_utf8s() | |
399 | * function we limit the size of the buffer where the converted | |
400 | * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee | |
401 | * that the strings can be properly terminated! | |
402 | */ | |
403 | ||
404 | switch (message->kvp_hdr.operation) { | |
03db7724 S |
405 | case KVP_OP_SET_IP_INFO: |
406 | process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); | |
407 | break; | |
408 | case KVP_OP_GET_IP_INFO: | |
409 | process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); | |
410 | break; | |
fa3d5b85 S |
411 | case KVP_OP_SET: |
412 | switch (in_msg->body.kvp_set.data.value_type) { | |
413 | case REG_SZ: | |
414 | /* | |
415 | * The value is a string - utf16 encoding. | |
416 | */ | |
417 | message->body.kvp_set.data.value_size = | |
418 | utf16s_to_utf8s( | |
419 | (wchar_t *)in_msg->body.kvp_set.data.value, | |
420 | in_msg->body.kvp_set.data.value_size, | |
421 | UTF16_LITTLE_ENDIAN, | |
422 | message->body.kvp_set.data.value, | |
423 | HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; | |
424 | break; | |
425 | ||
426 | case REG_U32: | |
427 | /* | |
428 | * The value is a 32 bit scalar. | |
429 | * We save this as a utf8 string. | |
430 | */ | |
431 | val32 = in_msg->body.kvp_set.data.value_u32; | |
432 | message->body.kvp_set.data.value_size = | |
433 | sprintf(message->body.kvp_set.data.value, | |
434 | "%d", val32) + 1; | |
435 | break; | |
436 | ||
437 | case REG_U64: | |
438 | /* | |
439 | * The value is a 64 bit scalar. | |
440 | * We save this as a utf8 string. | |
441 | */ | |
442 | val64 = in_msg->body.kvp_set.data.value_u64; | |
443 | message->body.kvp_set.data.value_size = | |
444 | sprintf(message->body.kvp_set.data.value, | |
445 | "%llu", val64) + 1; | |
446 | break; | |
447 | ||
448 | } | |
449 | case KVP_OP_GET: | |
450 | message->body.kvp_set.data.key_size = | |
451 | utf16s_to_utf8s( | |
452 | (wchar_t *)in_msg->body.kvp_set.data.key, | |
453 | in_msg->body.kvp_set.data.key_size, | |
454 | UTF16_LITTLE_ENDIAN, | |
455 | message->body.kvp_set.data.key, | |
456 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
457 | break; | |
458 | ||
459 | case KVP_OP_DELETE: | |
460 | message->body.kvp_delete.key_size = | |
461 | utf16s_to_utf8s( | |
462 | (wchar_t *)in_msg->body.kvp_delete.key, | |
463 | in_msg->body.kvp_delete.key_size, | |
464 | UTF16_LITTLE_ENDIAN, | |
465 | message->body.kvp_delete.key, | |
466 | HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; | |
467 | break; | |
468 | ||
469 | case KVP_OP_ENUMERATE: | |
470 | message->body.kvp_enum_data.index = | |
471 | in_msg->body.kvp_enum_data.index; | |
472 | break; | |
245ba56a | 473 | } |
fa3d5b85 | 474 | |
97bf16cd | 475 | kvp_transaction.state = HVUTIL_USERSPACE_REQ; |
e0fa3e5e | 476 | rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL); |
8d9560eb VK |
477 | if (rc) { |
478 | pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); | |
97bf16cd | 479 | if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
8d9560eb | 480 | kvp_respond_to_host(message, HV_E_FAIL); |
97bf16cd VK |
481 | kvp_transaction.state = HVUTIL_READY; |
482 | } | |
8d9560eb VK |
483 | } |
484 | ||
11bc3a5f | 485 | kfree(message); |
fa3d5b85 | 486 | |
e2bb6537 | 487 | return; |
245ba56a KS |
488 | } |
489 | ||
490 | /* | |
491 | * Send a response back to the host. | |
492 | */ | |
493 | ||
494 | static void | |
03db7724 | 495 | kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
245ba56a KS |
496 | { |
497 | struct hv_kvp_msg *kvp_msg; | |
fa3d5b85 | 498 | struct hv_kvp_exchg_msg_value *kvp_data; |
245ba56a | 499 | char *key_name; |
03db7724 | 500 | char *value; |
245ba56a | 501 | struct icmsg_hdr *icmsghdrp; |
fa3d5b85 S |
502 | int keylen = 0; |
503 | int valuelen = 0; | |
245ba56a KS |
504 | u32 buf_len; |
505 | struct vmbus_channel *channel; | |
506 | u64 req_id; | |
03db7724 | 507 | int ret; |
245ba56a | 508 | |
245ba56a KS |
509 | /* |
510 | * Copy the global state for completing the transaction. Note that | |
511 | * only one transaction can be active at a time. | |
512 | */ | |
513 | ||
514 | buf_len = kvp_transaction.recv_len; | |
515 | channel = kvp_transaction.recv_channel; | |
516 | req_id = kvp_transaction.recv_req_id; | |
517 | ||
fa3d5b85 S |
518 | icmsghdrp = (struct icmsg_hdr *) |
519 | &recv_buffer[sizeof(struct vmbuspipe_hdr)]; | |
520 | ||
4e65f6e8 S |
521 | if (channel->onchannel_callback == NULL) |
522 | /* | |
523 | * We have raced with util driver being unloaded; | |
524 | * silently return. | |
525 | */ | |
526 | return; | |
527 | ||
b47a81dc | 528 | icmsghdrp->status = error; |
245ba56a KS |
529 | |
530 | /* | |
adc80ae6 S |
531 | * If the error parameter is set, terminate the host's enumeration |
532 | * on this pool. | |
245ba56a KS |
533 | */ |
534 | if (error) { | |
535 | /* | |
b47a81dc S |
536 | * Something failed or we have timedout; |
537 | * terminate the current host-side iteration. | |
245ba56a | 538 | */ |
245ba56a KS |
539 | goto response_done; |
540 | } | |
541 | ||
fa3d5b85 S |
542 | kvp_msg = (struct hv_kvp_msg *) |
543 | &recv_buffer[sizeof(struct vmbuspipe_hdr) + | |
544 | sizeof(struct icmsg_hdr)]; | |
545 | ||
546 | switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { | |
03db7724 S |
547 | case KVP_OP_GET_IP_INFO: |
548 | ret = process_ob_ipinfo(msg_to_host, | |
549 | (struct hv_kvp_ip_msg *)kvp_msg, | |
550 | KVP_OP_GET_IP_INFO); | |
551 | if (ret < 0) | |
552 | icmsghdrp->status = HV_E_FAIL; | |
553 | ||
554 | goto response_done; | |
555 | case KVP_OP_SET_IP_INFO: | |
556 | goto response_done; | |
fa3d5b85 S |
557 | case KVP_OP_GET: |
558 | kvp_data = &kvp_msg->body.kvp_get.data; | |
559 | goto copy_value; | |
560 | ||
561 | case KVP_OP_SET: | |
562 | case KVP_OP_DELETE: | |
563 | goto response_done; | |
564 | ||
565 | default: | |
566 | break; | |
567 | } | |
568 | ||
569 | kvp_data = &kvp_msg->body.kvp_enum_data.data; | |
03db7724 | 570 | key_name = msg_to_host->body.kvp_enum_data.data.key; |
fa3d5b85 | 571 | |
245ba56a KS |
572 | /* |
573 | * The windows host expects the key/value pair to be encoded | |
fa3d5b85 S |
574 | * in utf16. Ensure that the key/value size reported to the host |
575 | * will be less than or equal to the MAX size (including the | |
576 | * terminating character). | |
245ba56a | 577 | */ |
0720a06a | 578 | keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
579 | (wchar_t *) kvp_data->key, |
580 | (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); | |
581 | kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ | |
582 | ||
583 | copy_value: | |
03db7724 | 584 | value = msg_to_host->body.kvp_enum_data.data.value; |
0720a06a | 585 | valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
fa3d5b85 S |
586 | (wchar_t *) kvp_data->value, |
587 | (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); | |
588 | kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ | |
245ba56a | 589 | |
fa3d5b85 S |
590 | /* |
591 | * If the utf8s to utf16s conversion failed; notify host | |
592 | * of the error. | |
593 | */ | |
594 | if ((keylen < 0) || (valuelen < 0)) | |
595 | icmsghdrp->status = HV_E_FAIL; | |
596 | ||
597 | kvp_data->value_type = REG_SZ; /* all our values are strings */ | |
245ba56a KS |
598 | |
599 | response_done: | |
600 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; | |
601 | ||
602 | vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, | |
415f2287 | 603 | VM_PKT_DATA_INBAND, 0); |
245ba56a KS |
604 | } |
605 | ||
606 | /* | |
607 | * This callback is invoked when we get a KVP message from the host. | |
608 | * The host ensures that only one KVP transaction can be active at a time. | |
609 | * KVP implementation in Linux needs to forward the key to a user-mde | |
610 | * component to retrive the corresponding value. Consequently, we cannot | |
611 | * respond to the host in the conext of this callback. Since the host | |
612 | * guarantees that at most only one transaction can be active at a time, | |
613 | * we stash away the transaction state in a set of global variables. | |
614 | */ | |
615 | ||
616 | void hv_kvp_onchannelcallback(void *context) | |
617 | { | |
618 | struct vmbus_channel *channel = context; | |
619 | u32 recvlen; | |
620 | u64 requestid; | |
621 | ||
622 | struct hv_kvp_msg *kvp_msg; | |
245ba56a KS |
623 | |
624 | struct icmsg_hdr *icmsghdrp; | |
3a491605 | 625 | int kvp_srv_version; |
4dbfc2e6 VK |
626 | static enum {NEGO_NOT_STARTED, |
627 | NEGO_IN_PROGRESS, | |
628 | NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; | |
245ba56a | 629 | |
4dbfc2e6 VK |
630 | if (host_negotiatied == NEGO_NOT_STARTED && |
631 | kvp_transaction.state < HVUTIL_READY) { | |
632 | /* | |
633 | * If userspace daemon is not connected and host is asking | |
634 | * us to negotiate we need to delay to not lose messages. | |
635 | * This is important for Failover IP setting. | |
636 | */ | |
637 | host_negotiatied = NEGO_IN_PROGRESS; | |
638 | schedule_delayed_work(&kvp_host_handshake_work, | |
639 | HV_UTIL_NEGO_TIMEOUT * HZ); | |
640 | return; | |
641 | } | |
3cace4a6 | 642 | if (kvp_transaction.state > HVUTIL_READY) |
fa3d5b85 | 643 | return; |
245ba56a | 644 | |
9bd2d0df | 645 | vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, |
03db7724 | 646 | &requestid); |
245ba56a KS |
647 | |
648 | if (recvlen > 0) { | |
245ba56a KS |
649 | icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ |
650 | sizeof(struct vmbuspipe_hdr)]; | |
651 | ||
652 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
1274a690 | 653 | if (vmbus_prep_negotiate_resp(icmsghdrp, |
a1656454 AN |
654 | recv_buffer, fw_versions, FW_VER_COUNT, |
655 | kvp_versions, KVP_VER_COUNT, | |
1274a690 AN |
656 | NULL, &kvp_srv_version)) { |
657 | pr_info("KVP IC version %d.%d\n", | |
658 | kvp_srv_version >> 16, | |
659 | kvp_srv_version & 0xFFFF); | |
660 | } | |
245ba56a KS |
661 | } else { |
662 | kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ | |
663 | sizeof(struct vmbuspipe_hdr) + | |
664 | sizeof(struct icmsg_hdr)]; | |
665 | ||
245ba56a KS |
666 | /* |
667 | * Stash away this global state for completing the | |
668 | * transaction; note transactions are serialized. | |
669 | */ | |
fa3d5b85 | 670 | |
245ba56a | 671 | kvp_transaction.recv_len = recvlen; |
245ba56a | 672 | kvp_transaction.recv_req_id = requestid; |
fa3d5b85 | 673 | kvp_transaction.kvp_msg = kvp_msg; |
245ba56a | 674 | |
97bf16cd VK |
675 | if (kvp_transaction.state < HVUTIL_READY) { |
676 | /* Userspace is not registered yet */ | |
677 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
678 | return; | |
679 | } | |
680 | kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; | |
681 | ||
245ba56a KS |
682 | /* |
683 | * Get the information from the | |
684 | * user-mode component. | |
685 | * component. This transaction will be | |
686 | * completed when we get the value from | |
687 | * the user-mode component. | |
688 | * Set a timeout to deal with | |
689 | * user-mode not responding. | |
690 | */ | |
e2bb6537 | 691 | schedule_work(&kvp_sendkey_work); |
c0b200cf S |
692 | schedule_delayed_work(&kvp_timeout_work, |
693 | HV_UTIL_TIMEOUT * HZ); | |
245ba56a KS |
694 | |
695 | return; | |
696 | ||
697 | } | |
698 | ||
245ba56a KS |
699 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
700 | | ICMSGHDRFLAG_RESPONSE; | |
701 | ||
702 | vmbus_sendpacket(channel, recv_buffer, | |
703 | recvlen, requestid, | |
415f2287 | 704 | VM_PKT_DATA_INBAND, 0); |
4dbfc2e6 VK |
705 | |
706 | host_negotiatied = NEGO_FINISHED; | |
245ba56a KS |
707 | } |
708 | ||
709 | } | |
710 | ||
11bc3a5f VK |
711 | static void kvp_on_reset(void) |
712 | { | |
713 | if (cancel_delayed_work_sync(&kvp_timeout_work)) | |
714 | kvp_respond_to_host(NULL, HV_E_FAIL); | |
715 | kvp_transaction.state = HVUTIL_DEVICE_INIT; | |
716 | } | |
717 | ||
245ba56a | 718 | int |
a29b643c | 719 | hv_kvp_init(struct hv_util_service *srv) |
245ba56a | 720 | { |
a29b643c | 721 | recv_buffer = srv->recv_buffer; |
b9830d12 | 722 | kvp_transaction.recv_channel = srv->channel; |
245ba56a | 723 | |
fa3d5b85 S |
724 | /* |
725 | * When this driver loads, the user level daemon that | |
726 | * processes the host requests may not yet be running. | |
727 | * Defer processing channel callbacks until the daemon | |
728 | * has registered. | |
729 | */ | |
97bf16cd | 730 | kvp_transaction.state = HVUTIL_DEVICE_INIT; |
fa3d5b85 | 731 | |
11bc3a5f VK |
732 | hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, |
733 | kvp_on_msg, kvp_on_reset); | |
734 | if (!hvt) | |
735 | return -EFAULT; | |
736 | ||
245ba56a KS |
737 | return 0; |
738 | } | |
739 | ||
740 | void hv_kvp_deinit(void) | |
741 | { | |
97bf16cd | 742 | kvp_transaction.state = HVUTIL_DEVICE_DYING; |
4dbfc2e6 | 743 | cancel_delayed_work_sync(&kvp_host_handshake_work); |
68c8b39a | 744 | cancel_delayed_work_sync(&kvp_timeout_work); |
e2bb6537 | 745 | cancel_work_sync(&kvp_sendkey_work); |
11bc3a5f | 746 | hvutil_transport_destroy(hvt); |
245ba56a | 747 | } |