Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "cifspdu.h" | |
34 | #include "cifsglob.h" | |
35 | #include "cifsproto.h" | |
36 | #include "cifs_debug.h" | |
50c2f753 | 37 | |
1da177e4 | 38 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 39 | |
2b84a36c JL |
40 | static void |
41 | wake_up_task(struct mid_q_entry *mid) | |
42 | { | |
43 | wake_up_process(mid->callback_data); | |
44 | } | |
45 | ||
a6827c18 | 46 | struct mid_q_entry * |
24b9b06b | 47 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
48 | { |
49 | struct mid_q_entry *temp; | |
50 | ||
24b9b06b | 51 | if (server == NULL) { |
b6b38f70 | 52 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
53 | return NULL; |
54 | } | |
50c2f753 | 55 | |
232087cb | 56 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
57 | if (temp == NULL) |
58 | return temp; | |
59 | else { | |
26f57364 | 60 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
61 | temp->mid = smb_buffer->Mid; /* always LE */ |
62 | temp->pid = current->pid; | |
63 | temp->command = smb_buffer->Command; | |
b6b38f70 | 64 | cFYI(1, "For smb_command %d", temp->command); |
1047abc1 SF |
65 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
66 | /* when mid allocated can be before when sent */ | |
67 | temp->when_alloc = jiffies; | |
2b84a36c JL |
68 | |
69 | /* | |
70 | * The default is for the mid to be synchronous, so the | |
71 | * default callback just wakes up the current task. | |
72 | */ | |
73 | temp->callback = wake_up_task; | |
74 | temp->callback_data = current; | |
1da177e4 LT |
75 | } |
76 | ||
1da177e4 LT |
77 | atomic_inc(&midCount); |
78 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
79 | return temp; |
80 | } | |
81 | ||
766fdbb5 | 82 | void |
1da177e4 LT |
83 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
84 | { | |
1047abc1 SF |
85 | #ifdef CONFIG_CIFS_STATS2 |
86 | unsigned long now; | |
87 | #endif | |
1da177e4 | 88 | midEntry->midState = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
79a58d1f | 90 | if (midEntry->largeBuf) |
b8643e1b SF |
91 | cifs_buf_release(midEntry->resp_buf); |
92 | else | |
93 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
94 | #ifdef CONFIG_CIFS_STATS2 |
95 | now = jiffies; | |
96 | /* commands taking longer than one second are indications that | |
97 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
98 | if ((now - midEntry->when_alloc) > HZ) { |
99 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
100 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
101 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
102 | midEntry->command, midEntry->mid); | |
103 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
104 | now - midEntry->when_alloc, | |
105 | now - midEntry->when_sent, | |
106 | now - midEntry->when_received); | |
107 | } | |
108 | } | |
109 | #endif | |
1da177e4 LT |
110 | mempool_free(midEntry, cifs_mid_poolp); |
111 | } | |
112 | ||
ddc8cf8f JL |
113 | static void |
114 | delete_mid(struct mid_q_entry *mid) | |
115 | { | |
116 | spin_lock(&GlobalMid_Lock); | |
117 | list_del(&mid->qhead); | |
118 | spin_unlock(&GlobalMid_Lock); | |
119 | ||
120 | DeleteMidQEntry(mid); | |
121 | } | |
122 | ||
d6e04ae6 | 123 | static int |
0496e02d | 124 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
125 | { |
126 | int rc = 0; | |
127 | int i = 0; | |
128 | struct msghdr smb_msg; | |
3e84469d SF |
129 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
130 | unsigned int len = iov[0].iov_len; | |
131 | unsigned int total_len; | |
132 | int first_vec = 0; | |
be8e3b00 | 133 | unsigned int smb_buf_length = be32_to_cpu(smb_buffer->smb_buf_length); |
edf1ae40 | 134 | struct socket *ssocket = server->ssocket; |
50c2f753 | 135 | |
79a58d1f | 136 | if (ssocket == NULL) |
1da177e4 | 137 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 138 | |
a9f1b85e | 139 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 140 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
141 | smb_msg.msg_control = NULL; |
142 | smb_msg.msg_controllen = 0; | |
0496e02d | 143 | if (server->noblocksnd) |
edf1ae40 SF |
144 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
145 | else | |
146 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 147 | |
3e84469d SF |
148 | total_len = 0; |
149 | for (i = 0; i < n_vec; i++) | |
150 | total_len += iov[i].iov_len; | |
151 | ||
b6b38f70 | 152 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
153 | dump_smb(smb_buffer, len); |
154 | ||
17680356 | 155 | i = 0; |
3e84469d SF |
156 | while (total_len) { |
157 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
158 | n_vec - first_vec, total_len); | |
1da177e4 LT |
159 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
160 | i++; | |
da505c38 SF |
161 | /* if blocking send we try 3 times, since each can block |
162 | for 5 seconds. For nonblocking we have to try more | |
163 | but wait increasing amounts of time allowing time for | |
164 | socket to clear. The overall time we wait in either | |
165 | case to send on the socket is about 15 seconds. | |
166 | Similarly we wait for 15 seconds for | |
167 | a response from the server in SendReceive[2] | |
168 | for the server to send a response back for | |
169 | most types of requests (except SMB Write | |
170 | past end of file which can be slow, and | |
171 | blocking lock operations). NFS waits slightly longer | |
172 | than CIFS, but this can make it take longer for | |
173 | nonresponsive servers to be detected and 15 seconds | |
174 | is more than enough time for modern networks to | |
175 | send a packet. In most cases if we fail to send | |
176 | after the retries we will kill the socket and | |
177 | reconnect which may clear the network problem. | |
178 | */ | |
179 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
180 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
181 | ssocket); | |
1da177e4 LT |
182 | rc = -EAGAIN; |
183 | break; | |
184 | } | |
68058e75 | 185 | msleep(1 << i); |
1da177e4 LT |
186 | continue; |
187 | } | |
79a58d1f | 188 | if (rc < 0) |
1da177e4 | 189 | break; |
3e84469d | 190 | |
61de800d SF |
191 | if (rc == total_len) { |
192 | total_len = 0; | |
193 | break; | |
194 | } else if (rc > total_len) { | |
b6b38f70 | 195 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
196 | break; |
197 | } | |
79a58d1f | 198 | if (rc == 0) { |
3e84469d SF |
199 | /* should never happen, letting socket clear before |
200 | retrying is our only obvious option here */ | |
b6b38f70 | 201 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
202 | msleep(500); |
203 | continue; | |
d6e04ae6 | 204 | } |
3e84469d | 205 | total_len -= rc; |
68058e75 | 206 | /* the line below resets i */ |
3e84469d SF |
207 | for (i = first_vec; i < n_vec; i++) { |
208 | if (iov[i].iov_len) { | |
209 | if (rc > iov[i].iov_len) { | |
210 | rc -= iov[i].iov_len; | |
211 | iov[i].iov_len = 0; | |
212 | } else { | |
213 | iov[i].iov_base += rc; | |
214 | iov[i].iov_len -= rc; | |
215 | first_vec = i; | |
216 | break; | |
217 | } | |
218 | } | |
d6e04ae6 | 219 | } |
5e1253b5 | 220 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
221 | } |
222 | ||
edf1ae40 | 223 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
224 | cFYI(1, "partial send (%d remaining), terminating session", |
225 | total_len); | |
edf1ae40 SF |
226 | /* If we have only sent part of an SMB then the next SMB |
227 | could be taken as the remainder of this one. We need | |
228 | to kill the socket so the server throws away the partial | |
229 | SMB */ | |
230 | server->tcpStatus = CifsNeedReconnect; | |
231 | } | |
232 | ||
d804d41d | 233 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 234 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 235 | else |
1da177e4 | 236 | rc = 0; |
1da177e4 | 237 | |
7ee1af76 JA |
238 | /* Don't want to modify the buffer as a |
239 | side effect of this call. */ | |
be8e3b00 | 240 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buf_length); |
7ee1af76 | 241 | |
1da177e4 LT |
242 | return rc; |
243 | } | |
244 | ||
0496e02d JL |
245 | int |
246 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
247 | unsigned int smb_buf_length) | |
248 | { | |
249 | struct kvec iov; | |
250 | ||
251 | iov.iov_base = smb_buffer; | |
252 | iov.iov_len = smb_buf_length + 4; | |
253 | ||
254 | return smb_sendv(server, &iov, 1); | |
255 | } | |
256 | ||
c5797a94 JL |
257 | static int wait_for_free_request(struct TCP_Server_Info *server, |
258 | const int long_op) | |
1da177e4 | 259 | { |
133672ef | 260 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 261 | /* oplock breaks must not be held up */ |
c5797a94 | 262 | atomic_inc(&server->inFlight); |
27a97a61 VL |
263 | return 0; |
264 | } | |
265 | ||
266 | spin_lock(&GlobalMid_Lock); | |
267 | while (1) { | |
10b9b98e | 268 | if (atomic_read(&server->inFlight) >= server->maxReq) { |
27a97a61 | 269 | spin_unlock(&GlobalMid_Lock); |
789e6661 | 270 | cifs_num_waiters_inc(server); |
c5797a94 JL |
271 | wait_event(server->request_q, |
272 | atomic_read(&server->inFlight) | |
10b9b98e | 273 | < server->maxReq); |
789e6661 | 274 | cifs_num_waiters_dec(server); |
27a97a61 VL |
275 | spin_lock(&GlobalMid_Lock); |
276 | } else { | |
c5797a94 | 277 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 278 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 279 | return -ENOENT; |
1da177e4 | 280 | } |
27a97a61 VL |
281 | |
282 | /* can not count locking commands against total | |
283 | as they are allowed to block on server */ | |
284 | ||
285 | /* update # of requests on the wire to server */ | |
286 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 287 | atomic_inc(&server->inFlight); |
27a97a61 VL |
288 | spin_unlock(&GlobalMid_Lock); |
289 | break; | |
1da177e4 LT |
290 | } |
291 | } | |
7ee1af76 JA |
292 | return 0; |
293 | } | |
1da177e4 | 294 | |
96daf2b0 | 295 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
296 | struct mid_q_entry **ppmidQ) |
297 | { | |
1da177e4 | 298 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 299 | return -ENOENT; |
8fbbd365 VL |
300 | } |
301 | ||
302 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 303 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 304 | return -EAGAIN; |
8fbbd365 VL |
305 | } |
306 | ||
307 | if (ses->status != CifsGood) { | |
1da177e4 | 308 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 309 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 310 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 311 | return -EAGAIN; |
ad7a2926 | 312 | /* else ok - we are setting up session */ |
1da177e4 | 313 | } |
24b9b06b | 314 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 315 | if (*ppmidQ == NULL) |
7ee1af76 | 316 | return -ENOMEM; |
ddc8cf8f JL |
317 | spin_lock(&GlobalMid_Lock); |
318 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
319 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
320 | return 0; |
321 | } | |
322 | ||
0ade640e JL |
323 | static int |
324 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 325 | { |
0ade640e | 326 | int error; |
7ee1af76 | 327 | |
f06ac72e | 328 | error = wait_event_freezekillable(server->response_q, |
0ade640e JL |
329 | midQ->midState != MID_REQUEST_SUBMITTED); |
330 | if (error < 0) | |
331 | return -ERESTARTSYS; | |
7ee1af76 | 332 | |
0ade640e | 333 | return 0; |
7ee1af76 JA |
334 | } |
335 | ||
133672ef | 336 | |
a6827c18 JL |
337 | /* |
338 | * Send a SMB request and set the callback function in the mid to handle | |
339 | * the result. Caller is responsible for dealing with timeouts. | |
340 | */ | |
341 | int | |
fcc31cb6 | 342 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 JL |
343 | unsigned int nvec, mid_receive_t *receive, |
344 | mid_callback_t *callback, void *cbdata, bool ignore_pend) | |
a6827c18 JL |
345 | { |
346 | int rc; | |
347 | struct mid_q_entry *mid; | |
fcc31cb6 | 348 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
a6827c18 | 349 | |
59ffd841 | 350 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
351 | if (rc) |
352 | return rc; | |
353 | ||
e3f0dadb | 354 | /* enable signing if server requires it */ |
96daf2b0 | 355 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
fcc31cb6 | 356 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
e3f0dadb | 357 | |
a6827c18 | 358 | mutex_lock(&server->srv_mutex); |
fcc31cb6 | 359 | mid = AllocMidQEntry(hdr, server); |
a6827c18 JL |
360 | if (mid == NULL) { |
361 | mutex_unlock(&server->srv_mutex); | |
0193e072 PS |
362 | atomic_dec(&server->inFlight); |
363 | wake_up(&server->request_q); | |
a6827c18 JL |
364 | return -ENOMEM; |
365 | } | |
366 | ||
367 | /* put it on the pending_mid_q */ | |
368 | spin_lock(&GlobalMid_Lock); | |
369 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
370 | spin_unlock(&GlobalMid_Lock); | |
371 | ||
fcc31cb6 | 372 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); |
a6827c18 JL |
373 | if (rc) { |
374 | mutex_unlock(&server->srv_mutex); | |
375 | goto out_err; | |
376 | } | |
377 | ||
44d22d84 | 378 | mid->receive = receive; |
a6827c18 JL |
379 | mid->callback = callback; |
380 | mid->callback_data = cbdata; | |
381 | mid->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
382 | |
383 | cifs_in_send_inc(server); | |
fcc31cb6 | 384 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
385 | cifs_in_send_dec(server); |
386 | cifs_save_when_sent(mid); | |
a6827c18 | 387 | mutex_unlock(&server->srv_mutex); |
789e6661 | 388 | |
a6827c18 JL |
389 | if (rc) |
390 | goto out_err; | |
391 | ||
392 | return rc; | |
393 | out_err: | |
394 | delete_mid(mid); | |
395 | atomic_dec(&server->inFlight); | |
396 | wake_up(&server->request_q); | |
397 | return rc; | |
398 | } | |
399 | ||
133672ef SF |
400 | /* |
401 | * | |
402 | * Send an SMB Request. No response info (other than return code) | |
403 | * needs to be parsed. | |
404 | * | |
405 | * flags indicate the type of request buffer and how long to wait | |
406 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
407 | * | |
408 | */ | |
409 | int | |
96daf2b0 | 410 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
133672ef SF |
411 | struct smb_hdr *in_buf, int flags) |
412 | { | |
413 | int rc; | |
414 | struct kvec iov[1]; | |
415 | int resp_buf_type; | |
416 | ||
417 | iov[0].iov_base = (char *)in_buf; | |
be8e3b00 | 418 | iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4; |
133672ef SF |
419 | flags |= CIFS_NO_RESP; |
420 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 421 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 422 | |
133672ef SF |
423 | return rc; |
424 | } | |
425 | ||
053d5034 | 426 | static int |
3c1105df | 427 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
428 | { |
429 | int rc = 0; | |
430 | ||
74dd92a8 JL |
431 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
432 | mid->mid, mid->midState); | |
053d5034 | 433 | |
74dd92a8 JL |
434 | spin_lock(&GlobalMid_Lock); |
435 | switch (mid->midState) { | |
436 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
437 | spin_unlock(&GlobalMid_Lock); |
438 | return rc; | |
74dd92a8 JL |
439 | case MID_RETRY_NEEDED: |
440 | rc = -EAGAIN; | |
441 | break; | |
71823baf JL |
442 | case MID_RESPONSE_MALFORMED: |
443 | rc = -EIO; | |
444 | break; | |
3c1105df JL |
445 | case MID_SHUTDOWN: |
446 | rc = -EHOSTDOWN; | |
447 | break; | |
74dd92a8 | 448 | default: |
3c1105df | 449 | list_del_init(&mid->qhead); |
74dd92a8 JL |
450 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, |
451 | mid->mid, mid->midState); | |
452 | rc = -EIO; | |
053d5034 JL |
453 | } |
454 | spin_unlock(&GlobalMid_Lock); | |
455 | ||
2b84a36c | 456 | DeleteMidQEntry(mid); |
053d5034 JL |
457 | return rc; |
458 | } | |
459 | ||
76dcc26f JL |
460 | /* |
461 | * An NT cancel request header looks just like the original request except: | |
462 | * | |
463 | * The Command is SMB_COM_NT_CANCEL | |
464 | * The WordCount is zeroed out | |
465 | * The ByteCount is zeroed out | |
466 | * | |
467 | * This function mangles an existing request buffer into a | |
468 | * SMB_COM_NT_CANCEL request and then sends it. | |
469 | */ | |
470 | static int | |
471 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
472 | struct mid_q_entry *mid) | |
473 | { | |
474 | int rc = 0; | |
475 | ||
476 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 477 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
478 | in_buf->Command = SMB_COM_NT_CANCEL; |
479 | in_buf->WordCount = 0; | |
820a803f | 480 | put_bcc(0, in_buf); |
76dcc26f JL |
481 | |
482 | mutex_lock(&server->srv_mutex); | |
483 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
484 | if (rc) { | |
485 | mutex_unlock(&server->srv_mutex); | |
486 | return rc; | |
487 | } | |
be8e3b00 | 488 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
489 | mutex_unlock(&server->srv_mutex); |
490 | ||
491 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
492 | in_buf->Mid, rc); | |
493 | ||
494 | return rc; | |
495 | } | |
496 | ||
2c8f981d JL |
497 | int |
498 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
499 | bool log_error) | |
500 | { | |
826a95e4 JL |
501 | unsigned int len = be32_to_cpu(mid->resp_buf->smb_buf_length) + 4; |
502 | ||
503 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
504 | |
505 | /* convert the length into a more usable form */ | |
96daf2b0 | 506 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
507 | struct kvec iov; |
508 | ||
509 | iov.iov_base = mid->resp_buf; | |
510 | iov.iov_len = len; | |
2c8f981d | 511 | /* FIXME: add code to kill session */ |
826a95e4 | 512 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
513 | mid->sequence_number + 1) != 0) |
514 | cERROR(1, "Unexpected SMB signature"); | |
515 | } | |
516 | ||
517 | /* BB special case reconnect tid and uid here? */ | |
518 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
519 | } | |
520 | ||
7ee1af76 | 521 | int |
96daf2b0 | 522 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 523 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 524 | const int flags) |
7ee1af76 JA |
525 | { |
526 | int rc = 0; | |
133672ef | 527 | int long_op; |
7ee1af76 JA |
528 | struct mid_q_entry *midQ; |
529 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 530 | |
133672ef SF |
531 | long_op = flags & CIFS_TIMEOUT_MASK; |
532 | ||
7ee1af76 JA |
533 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
534 | ||
535 | if ((ses == NULL) || (ses->server == NULL)) { | |
536 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 537 | cERROR(1, "Null session"); |
7ee1af76 JA |
538 | return -EIO; |
539 | } | |
540 | ||
79a58d1f | 541 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
542 | cifs_small_buf_release(in_buf); |
543 | return -ENOENT; | |
544 | } | |
545 | ||
79a58d1f | 546 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
547 | to the same server. We may make this configurable later or |
548 | use ses->maxReq */ | |
549 | ||
c5797a94 | 550 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
551 | if (rc) { |
552 | cifs_small_buf_release(in_buf); | |
553 | return rc; | |
554 | } | |
555 | ||
79a58d1f | 556 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
557 | and avoid races inside tcp sendmsg code that could cause corruption |
558 | of smb data */ | |
559 | ||
72ca545b | 560 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
561 | |
562 | rc = allocate_mid(ses, in_buf, &midQ); | |
563 | if (rc) { | |
72ca545b | 564 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 565 | cifs_small_buf_release(in_buf); |
7ee1af76 | 566 | /* Update # of requests on wire to server */ |
79a58d1f | 567 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
568 | wake_up(&ses->server->request_q); |
569 | return rc; | |
1da177e4 | 570 | } |
79a58d1f | 571 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
572 | if (rc) { |
573 | mutex_unlock(&ses->server->srv_mutex); | |
574 | cifs_small_buf_release(in_buf); | |
575 | goto out; | |
576 | } | |
1da177e4 LT |
577 | |
578 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 | 579 | cifs_in_send_inc(ses->server); |
0496e02d | 580 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
581 | cifs_in_send_dec(ses->server); |
582 | cifs_save_when_sent(midQ); | |
7ee1af76 | 583 | |
72ca545b | 584 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 585 | |
2db7c581 JL |
586 | if (rc < 0) { |
587 | cifs_small_buf_release(in_buf); | |
7ee1af76 | 588 | goto out; |
2db7c581 | 589 | } |
4b8f930f | 590 | |
2db7c581 JL |
591 | if (long_op == CIFS_ASYNC_OP) { |
592 | cifs_small_buf_release(in_buf); | |
133672ef | 593 | goto out; |
2db7c581 | 594 | } |
d6e04ae6 | 595 | |
0ade640e | 596 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 597 | if (rc != 0) { |
2db7c581 | 598 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
599 | spin_lock(&GlobalMid_Lock); |
600 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
601 | midQ->callback = DeleteMidQEntry; | |
602 | spin_unlock(&GlobalMid_Lock); | |
2db7c581 | 603 | cifs_small_buf_release(in_buf); |
1be912dd JL |
604 | atomic_dec(&ses->server->inFlight); |
605 | wake_up(&ses->server->request_q); | |
606 | return rc; | |
607 | } | |
608 | spin_unlock(&GlobalMid_Lock); | |
609 | } | |
d6e04ae6 | 610 | |
2db7c581 JL |
611 | cifs_small_buf_release(in_buf); |
612 | ||
3c1105df | 613 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 614 | if (rc != 0) { |
79a58d1f | 615 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 616 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
617 | return rc; |
618 | } | |
50c2f753 | 619 | |
2c8f981d | 620 | if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 621 | rc = -EIO; |
2c8f981d | 622 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
623 | goto out; |
624 | } | |
625 | ||
2c8f981d JL |
626 | iov[0].iov_base = (char *)midQ->resp_buf; |
627 | iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; | |
628 | if (midQ->largeBuf) | |
629 | *pRespBufType = CIFS_LARGE_BUFFER; | |
630 | else | |
631 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 632 | |
2c8f981d | 633 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 634 | |
2c8f981d JL |
635 | /* mark it so buf will not be freed by delete_mid */ |
636 | if ((flags & CIFS_NO_RESP) == 0) | |
637 | midQ->resp_buf = NULL; | |
7ee1af76 | 638 | out: |
ddc8cf8f | 639 | delete_mid(midQ); |
79a58d1f | 640 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 641 | wake_up(&ses->server->request_q); |
1da177e4 | 642 | |
d6e04ae6 SF |
643 | return rc; |
644 | } | |
1da177e4 LT |
645 | |
646 | int | |
96daf2b0 | 647 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
648 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
649 | int *pbytes_returned, const int long_op) | |
650 | { | |
651 | int rc = 0; | |
1da177e4 LT |
652 | struct mid_q_entry *midQ; |
653 | ||
654 | if (ses == NULL) { | |
b6b38f70 | 655 | cERROR(1, "Null smb session"); |
1da177e4 LT |
656 | return -EIO; |
657 | } | |
79a58d1f | 658 | if (ses->server == NULL) { |
b6b38f70 | 659 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
660 | return -EIO; |
661 | } | |
662 | ||
79a58d1f | 663 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
664 | return -ENOENT; |
665 | ||
79a58d1f | 666 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
667 | to the same server. We may make this configurable later or |
668 | use ses->maxReq */ | |
1da177e4 | 669 | |
be8e3b00 SF |
670 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
671 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 672 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 673 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
674 | return -EIO; |
675 | } | |
676 | ||
c5797a94 | 677 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
678 | if (rc) |
679 | return rc; | |
680 | ||
79a58d1f | 681 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
682 | and avoid races inside tcp sendmsg code that could cause corruption |
683 | of smb data */ | |
684 | ||
72ca545b | 685 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 686 | |
7ee1af76 JA |
687 | rc = allocate_mid(ses, in_buf, &midQ); |
688 | if (rc) { | |
72ca545b | 689 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 690 | /* Update # of requests on wire to server */ |
79a58d1f | 691 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
692 | wake_up(&ses->server->request_q); |
693 | return rc; | |
1da177e4 LT |
694 | } |
695 | ||
ad009ac9 | 696 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
697 | if (rc) { |
698 | mutex_unlock(&ses->server->srv_mutex); | |
699 | goto out; | |
700 | } | |
1da177e4 LT |
701 | |
702 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
703 | |
704 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 705 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
706 | cifs_in_send_dec(ses->server); |
707 | cifs_save_when_sent(midQ); | |
72ca545b | 708 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 709 | |
79a58d1f | 710 | if (rc < 0) |
7ee1af76 JA |
711 | goto out; |
712 | ||
0ade640e | 713 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 714 | goto out; |
1da177e4 | 715 | |
0ade640e | 716 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 717 | if (rc != 0) { |
2db7c581 | 718 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
719 | spin_lock(&GlobalMid_Lock); |
720 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
721 | /* no longer considered to be "in-flight" */ | |
722 | midQ->callback = DeleteMidQEntry; | |
723 | spin_unlock(&GlobalMid_Lock); | |
724 | atomic_dec(&ses->server->inFlight); | |
725 | wake_up(&ses->server->request_q); | |
726 | return rc; | |
727 | } | |
728 | spin_unlock(&GlobalMid_Lock); | |
729 | } | |
1da177e4 | 730 | |
3c1105df | 731 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 732 | if (rc != 0) { |
79a58d1f | 733 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 734 | wake_up(&ses->server->request_q); |
1da177e4 LT |
735 | return rc; |
736 | } | |
50c2f753 | 737 | |
2c8f981d JL |
738 | if (!midQ->resp_buf || !out_buf || |
739 | midQ->midState != MID_RESPONSE_RECEIVED) { | |
2b2bdfba | 740 | rc = -EIO; |
b6b38f70 | 741 | cERROR(1, "Bad MID state?"); |
2c8f981d | 742 | goto out; |
1da177e4 | 743 | } |
7ee1af76 | 744 | |
2c8f981d JL |
745 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
746 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
747 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 748 | out: |
ddc8cf8f | 749 | delete_mid(midQ); |
79a58d1f | 750 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 751 | wake_up(&ses->server->request_q); |
1da177e4 | 752 | |
7ee1af76 JA |
753 | return rc; |
754 | } | |
1da177e4 | 755 | |
7ee1af76 JA |
756 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
757 | blocking lock to return. */ | |
758 | ||
759 | static int | |
96daf2b0 | 760 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
761 | struct smb_hdr *in_buf, |
762 | struct smb_hdr *out_buf) | |
763 | { | |
764 | int bytes_returned; | |
96daf2b0 | 765 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
766 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
767 | ||
768 | /* We just modify the current in_buf to change | |
769 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
770 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
771 | LOCKING_ANDX_CANCEL_LOCK. */ | |
772 | ||
773 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
774 | pSMB->Timeout = 0; | |
775 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
776 | ||
777 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 778 | &bytes_returned, 0); |
7ee1af76 JA |
779 | } |
780 | ||
781 | int | |
96daf2b0 | 782 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
783 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
784 | int *pbytes_returned) | |
785 | { | |
786 | int rc = 0; | |
787 | int rstart = 0; | |
7ee1af76 | 788 | struct mid_q_entry *midQ; |
96daf2b0 | 789 | struct cifs_ses *ses; |
7ee1af76 JA |
790 | |
791 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 792 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
793 | return -EIO; |
794 | } | |
795 | ses = tcon->ses; | |
796 | ||
79a58d1f | 797 | if (ses->server == NULL) { |
b6b38f70 | 798 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
799 | return -EIO; |
800 | } | |
801 | ||
79a58d1f | 802 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
803 | return -ENOENT; |
804 | ||
79a58d1f | 805 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
806 | to the same server. We may make this configurable later or |
807 | use ses->maxReq */ | |
808 | ||
be8e3b00 SF |
809 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
810 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 811 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 812 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
813 | return -EIO; |
814 | } | |
815 | ||
c5797a94 | 816 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
817 | if (rc) |
818 | return rc; | |
819 | ||
79a58d1f | 820 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
821 | and avoid races inside tcp sendmsg code that could cause corruption |
822 | of smb data */ | |
823 | ||
72ca545b | 824 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
825 | |
826 | rc = allocate_mid(ses, in_buf, &midQ); | |
827 | if (rc) { | |
72ca545b | 828 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
829 | return rc; |
830 | } | |
831 | ||
7ee1af76 | 832 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 833 | if (rc) { |
ddc8cf8f | 834 | delete_mid(midQ); |
829049cb VL |
835 | mutex_unlock(&ses->server->srv_mutex); |
836 | return rc; | |
837 | } | |
1da177e4 | 838 | |
7ee1af76 | 839 | midQ->midState = MID_REQUEST_SUBMITTED; |
789e6661 | 840 | cifs_in_send_inc(ses->server); |
be8e3b00 | 841 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
842 | cifs_in_send_dec(ses->server); |
843 | cifs_save_when_sent(midQ); | |
72ca545b | 844 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 845 | |
79a58d1f | 846 | if (rc < 0) { |
ddc8cf8f | 847 | delete_mid(midQ); |
7ee1af76 JA |
848 | return rc; |
849 | } | |
850 | ||
851 | /* Wait for a reply - allow signals to interrupt. */ | |
852 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 853 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
854 | ((ses->server->tcpStatus != CifsGood) && |
855 | (ses->server->tcpStatus != CifsNew))); | |
856 | ||
857 | /* Were we interrupted by a signal ? */ | |
858 | if ((rc == -ERESTARTSYS) && | |
859 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
860 | ((ses->server->tcpStatus == CifsGood) || | |
861 | (ses->server->tcpStatus == CifsNew))) { | |
862 | ||
863 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
864 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
865 | blocking lock to return. */ | |
76dcc26f | 866 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 867 | if (rc) { |
ddc8cf8f | 868 | delete_mid(midQ); |
7ee1af76 JA |
869 | return rc; |
870 | } | |
871 | } else { | |
872 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
873 | to cause the blocking lock to return. */ | |
874 | ||
875 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
876 | ||
877 | /* If we get -ENOLCK back the lock may have | |
878 | already been removed. Don't exit in this case. */ | |
879 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 880 | delete_mid(midQ); |
7ee1af76 JA |
881 | return rc; |
882 | } | |
883 | } | |
884 | ||
1be912dd JL |
885 | rc = wait_for_response(ses->server, midQ); |
886 | if (rc) { | |
2db7c581 | 887 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
888 | spin_lock(&GlobalMid_Lock); |
889 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
890 | /* no longer considered to be "in-flight" */ | |
891 | midQ->callback = DeleteMidQEntry; | |
892 | spin_unlock(&GlobalMid_Lock); | |
893 | return rc; | |
894 | } | |
895 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 896 | } |
1be912dd JL |
897 | |
898 | /* We got the response - restart system call. */ | |
899 | rstart = 1; | |
7ee1af76 JA |
900 | } |
901 | ||
3c1105df | 902 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 903 | if (rc != 0) |
7ee1af76 | 904 | return rc; |
50c2f753 | 905 | |
17c8bfed | 906 | /* rcvd frame is ok */ |
2c8f981d | 907 | if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) { |
698e96a8 | 908 | rc = -EIO; |
b6b38f70 | 909 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
910 | goto out; |
911 | } | |
1da177e4 | 912 | |
2c8f981d JL |
913 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
914 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
915 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 916 | out: |
ddc8cf8f | 917 | delete_mid(midQ); |
7ee1af76 JA |
918 | if (rstart && rc == -EACCES) |
919 | return -ERESTARTSYS; | |
1da177e4 LT |
920 | return rc; |
921 | } |