Commit | Line | Data |
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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> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/delay.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/processor.h> | |
30 | #include <linux/mempool.h> | |
31 | #include "cifspdu.h" | |
32 | #include "cifsglob.h" | |
33 | #include "cifsproto.h" | |
34 | #include "cifs_debug.h" | |
50c2f753 | 35 | |
1da177e4 | 36 | extern mempool_t *cifs_mid_poolp; |
e18b890b | 37 | extern struct kmem_cache *cifs_oplock_cachep; |
1da177e4 LT |
38 | |
39 | static struct mid_q_entry * | |
7ee1af76 | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
44 | if (ses == NULL) { | |
275cde1a | 45 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
1da177e4 LT |
46 | return NULL; |
47 | } | |
48 | if (ses->server == NULL) { | |
49 | cERROR(1, ("Null TCP session in AllocMidQEntry")); | |
50 | return NULL; | |
51 | } | |
50c2f753 | 52 | |
232087cb | 53 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
54 | if (temp == NULL) |
55 | return temp; | |
56 | else { | |
26f57364 | 57 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
58 | temp->mid = smb_buffer->Mid; /* always LE */ |
59 | temp->pid = current->pid; | |
60 | temp->command = smb_buffer->Command; | |
61 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
62 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
63 | /* when mid allocated can be before when sent */ | |
64 | temp->when_alloc = jiffies; | |
1da177e4 LT |
65 | temp->ses = ses; |
66 | temp->tsk = current; | |
67 | } | |
68 | ||
69 | spin_lock(&GlobalMid_Lock); | |
70 | list_add_tail(&temp->qhead, &ses->server->pending_mid_q); | |
71 | atomic_inc(&midCount); | |
72 | temp->midState = MID_REQUEST_ALLOCATED; | |
73 | spin_unlock(&GlobalMid_Lock); | |
74 | return temp; | |
75 | } | |
76 | ||
77 | static void | |
78 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
79 | { | |
1047abc1 SF |
80 | #ifdef CONFIG_CIFS_STATS2 |
81 | unsigned long now; | |
82 | #endif | |
1da177e4 LT |
83 | spin_lock(&GlobalMid_Lock); |
84 | midEntry->midState = MID_FREE; | |
85 | list_del(&midEntry->qhead); | |
86 | atomic_dec(&midCount); | |
87 | spin_unlock(&GlobalMid_Lock); | |
79a58d1f | 88 | if (midEntry->largeBuf) |
b8643e1b SF |
89 | cifs_buf_release(midEntry->resp_buf); |
90 | else | |
91 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
92 | #ifdef CONFIG_CIFS_STATS2 |
93 | now = jiffies; | |
94 | /* commands taking longer than one second are indications that | |
95 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
96 | if ((now - midEntry->when_alloc) > HZ) { |
97 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
98 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
99 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
100 | midEntry->command, midEntry->mid); | |
101 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
102 | now - midEntry->when_alloc, | |
103 | now - midEntry->when_sent, | |
104 | now - midEntry->when_received); | |
105 | } | |
106 | } | |
107 | #endif | |
1da177e4 LT |
108 | mempool_free(midEntry, cifs_mid_poolp); |
109 | } | |
110 | ||
111 | struct oplock_q_entry * | |
79a58d1f | 112 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
1da177e4 LT |
113 | { |
114 | struct oplock_q_entry *temp; | |
79a58d1f | 115 | if ((pinode == NULL) || (tcon == NULL)) { |
1da177e4 LT |
116 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
117 | return NULL; | |
118 | } | |
119 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
e94b1766 | 120 | GFP_KERNEL); |
1da177e4 LT |
121 | if (temp == NULL) |
122 | return temp; | |
123 | else { | |
124 | temp->pinode = pinode; | |
125 | temp->tcon = tcon; | |
126 | temp->netfid = fid; | |
127 | spin_lock(&GlobalMid_Lock); | |
128 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
129 | spin_unlock(&GlobalMid_Lock); | |
130 | } | |
131 | return temp; | |
132 | ||
133 | } | |
134 | ||
79a58d1f | 135 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
1da177e4 | 136 | { |
79a58d1f | 137 | spin_lock(&GlobalMid_Lock); |
1da177e4 LT |
138 | /* should we check if list empty first? */ |
139 | list_del(&oplockEntry->qhead); | |
140 | spin_unlock(&GlobalMid_Lock); | |
141 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); | |
142 | } | |
143 | ||
5d941ca6 SF |
144 | |
145 | void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) | |
146 | { | |
147 | struct oplock_q_entry *temp; | |
148 | ||
149 | if (tcon == NULL) | |
150 | return; | |
151 | ||
152 | spin_lock(&GlobalMid_Lock); | |
153 | list_for_each_entry(temp, &GlobalOplock_Q, qhead) { | |
154 | if ((temp->tcon) && (temp->tcon == tcon)) { | |
155 | list_del(&temp->qhead); | |
156 | kmem_cache_free(cifs_oplock_cachep, temp); | |
157 | } | |
158 | } | |
159 | spin_unlock(&GlobalMid_Lock); | |
160 | } | |
161 | ||
1da177e4 LT |
162 | int |
163 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
edf1ae40 | 164 | unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd) |
1da177e4 LT |
165 | { |
166 | int rc = 0; | |
167 | int i = 0; | |
168 | struct msghdr smb_msg; | |
169 | struct kvec iov; | |
170 | unsigned len = smb_buf_length + 4; | |
171 | ||
79a58d1f | 172 | if (ssocket == NULL) |
1da177e4 LT |
173 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
174 | iov.iov_base = smb_buffer; | |
175 | iov.iov_len = len; | |
176 | ||
177 | smb_msg.msg_name = sin; | |
26f57364 | 178 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
179 | smb_msg.msg_control = NULL; |
180 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
181 | if (noblocksnd) |
182 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
183 | else | |
184 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
185 | |
186 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
187 | area, and byte area if necessary, is converted to littleendian in |
188 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
189 | Flags2 is converted in SendReceive */ |
190 | ||
191 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 192 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
193 | dump_smb(smb_buffer, len); |
194 | ||
195 | while (len > 0) { | |
196 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
197 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
198 | i++; | |
3e84469d | 199 | /* smaller timeout here than send2 since smaller size */ |
79a58d1f SF |
200 | /* Although it may not be required, this also is smaller |
201 | oplock break time */ | |
202 | if (i > 12) { | |
1da177e4 | 203 | cERROR(1, |
68058e75 | 204 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
205 | ssocket)); |
206 | rc = -EAGAIN; | |
207 | break; | |
208 | } | |
68058e75 | 209 | msleep(1 << i); |
1da177e4 LT |
210 | continue; |
211 | } | |
79a58d1f | 212 | if (rc < 0) |
1da177e4 | 213 | break; |
5e1253b5 SF |
214 | else |
215 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
216 | iov.iov_base += rc; |
217 | iov.iov_len -= rc; | |
218 | len -= rc; | |
219 | } | |
220 | ||
221 | if (rc < 0) { | |
79a58d1f | 222 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
223 | } else { |
224 | rc = 0; | |
225 | } | |
226 | ||
7ee1af76 JA |
227 | /* Don't want to modify the buffer as a |
228 | side effect of this call. */ | |
229 | smb_buffer->smb_buf_length = smb_buf_length; | |
230 | ||
1da177e4 LT |
231 | return rc; |
232 | } | |
233 | ||
d6e04ae6 | 234 | static int |
edf1ae40 SF |
235 | smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec, |
236 | struct sockaddr *sin, bool noblocksnd) | |
1da177e4 LT |
237 | { |
238 | int rc = 0; | |
239 | int i = 0; | |
240 | struct msghdr smb_msg; | |
3e84469d SF |
241 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
242 | unsigned int len = iov[0].iov_len; | |
243 | unsigned int total_len; | |
244 | int first_vec = 0; | |
7ee1af76 | 245 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 246 | struct socket *ssocket = server->ssocket; |
50c2f753 | 247 | |
79a58d1f | 248 | if (ssocket == NULL) |
1da177e4 | 249 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 250 | |
1da177e4 | 251 | smb_msg.msg_name = sin; |
26f57364 | 252 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
253 | smb_msg.msg_control = NULL; |
254 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
255 | if (noblocksnd) |
256 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
257 | else | |
258 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
259 | |
260 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
261 | area, and byte area if necessary, is converted to littleendian in |
262 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
263 | Flags2 is converted in SendReceive */ |
264 | ||
3e84469d SF |
265 | |
266 | total_len = 0; | |
267 | for (i = 0; i < n_vec; i++) | |
268 | total_len += iov[i].iov_len; | |
269 | ||
1da177e4 | 270 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 271 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
272 | dump_smb(smb_buffer, len); |
273 | ||
17680356 | 274 | i = 0; |
3e84469d SF |
275 | while (total_len) { |
276 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
277 | n_vec - first_vec, total_len); | |
1da177e4 LT |
278 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
279 | i++; | |
79a58d1f | 280 | if (i >= 14) { |
1da177e4 | 281 | cERROR(1, |
68058e75 | 282 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
283 | ssocket)); |
284 | rc = -EAGAIN; | |
285 | break; | |
286 | } | |
68058e75 | 287 | msleep(1 << i); |
1da177e4 LT |
288 | continue; |
289 | } | |
79a58d1f | 290 | if (rc < 0) |
1da177e4 | 291 | break; |
3e84469d SF |
292 | |
293 | if (rc >= total_len) { | |
294 | WARN_ON(rc > total_len); | |
295 | break; | |
296 | } | |
79a58d1f | 297 | if (rc == 0) { |
3e84469d SF |
298 | /* should never happen, letting socket clear before |
299 | retrying is our only obvious option here */ | |
79a58d1f | 300 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
301 | msleep(500); |
302 | continue; | |
d6e04ae6 | 303 | } |
3e84469d | 304 | total_len -= rc; |
68058e75 | 305 | /* the line below resets i */ |
3e84469d SF |
306 | for (i = first_vec; i < n_vec; i++) { |
307 | if (iov[i].iov_len) { | |
308 | if (rc > iov[i].iov_len) { | |
309 | rc -= iov[i].iov_len; | |
310 | iov[i].iov_len = 0; | |
311 | } else { | |
312 | iov[i].iov_base += rc; | |
313 | iov[i].iov_len -= rc; | |
314 | first_vec = i; | |
315 | break; | |
316 | } | |
317 | } | |
d6e04ae6 | 318 | } |
5e1253b5 | 319 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
320 | } |
321 | ||
edf1ae40 SF |
322 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
323 | cFYI(1, ("partial send (%d remaining), terminating session", | |
324 | total_len)); | |
325 | /* If we have only sent part of an SMB then the next SMB | |
326 | could be taken as the remainder of this one. We need | |
327 | to kill the socket so the server throws away the partial | |
328 | SMB */ | |
329 | server->tcpStatus = CifsNeedReconnect; | |
330 | } | |
331 | ||
1da177e4 | 332 | if (rc < 0) { |
79a58d1f | 333 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 334 | } else |
1da177e4 | 335 | rc = 0; |
1da177e4 | 336 | |
7ee1af76 JA |
337 | /* Don't want to modify the buffer as a |
338 | side effect of this call. */ | |
339 | smb_buffer->smb_buf_length = smb_buf_length; | |
340 | ||
1da177e4 LT |
341 | return rc; |
342 | } | |
343 | ||
7ee1af76 | 344 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 345 | { |
133672ef | 346 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
347 | /* oplock breaks must not be held up */ |
348 | atomic_inc(&ses->server->inFlight); | |
349 | } else { | |
79a58d1f SF |
350 | spin_lock(&GlobalMid_Lock); |
351 | while (1) { | |
352 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 353 | cifs_max_pending){ |
1da177e4 | 354 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
355 | #ifdef CONFIG_CIFS_STATS2 |
356 | atomic_inc(&ses->server->num_waiters); | |
357 | #endif | |
1da177e4 LT |
358 | wait_event(ses->server->request_q, |
359 | atomic_read(&ses->server->inFlight) | |
360 | < cifs_max_pending); | |
131afd0b SF |
361 | #ifdef CONFIG_CIFS_STATS2 |
362 | atomic_dec(&ses->server->num_waiters); | |
363 | #endif | |
1da177e4 LT |
364 | spin_lock(&GlobalMid_Lock); |
365 | } else { | |
79a58d1f | 366 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
367 | spin_unlock(&GlobalMid_Lock); |
368 | return -ENOENT; | |
369 | } | |
370 | ||
79a58d1f SF |
371 | /* can not count locking commands against total |
372 | as they are allowed to block on server */ | |
50c2f753 | 373 | |
1da177e4 | 374 | /* update # of requests on the wire to server */ |
133672ef | 375 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 376 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
377 | spin_unlock(&GlobalMid_Lock); |
378 | break; | |
379 | } | |
380 | } | |
381 | } | |
7ee1af76 JA |
382 | return 0; |
383 | } | |
1da177e4 | 384 | |
7ee1af76 JA |
385 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
386 | struct mid_q_entry **ppmidQ) | |
387 | { | |
1da177e4 | 388 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 389 | return -ENOENT; |
1da177e4 | 390 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
79a58d1f | 391 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 392 | return -EAGAIN; |
1da177e4 LT |
393 | } else if (ses->status != CifsGood) { |
394 | /* check if SMB session is bad because we are setting it up */ | |
79a58d1f | 395 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 396 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 397 | return -EAGAIN; |
ad7a2926 | 398 | /* else ok - we are setting up session */ |
1da177e4 | 399 | } |
7ee1af76 | 400 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
26f57364 | 401 | if (*ppmidQ == NULL) |
7ee1af76 | 402 | return -ENOMEM; |
7ee1af76 JA |
403 | return 0; |
404 | } | |
405 | ||
79a58d1f | 406 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
407 | struct mid_q_entry *midQ, |
408 | unsigned long timeout, | |
409 | unsigned long time_to_wait) | |
410 | { | |
411 | unsigned long curr_timeout; | |
412 | ||
413 | for (;;) { | |
414 | curr_timeout = timeout + jiffies; | |
415 | wait_event(ses->server->response_q, | |
79a58d1f SF |
416 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
417 | time_after(jiffies, curr_timeout) || | |
7ee1af76 JA |
418 | ((ses->server->tcpStatus != CifsGood) && |
419 | (ses->server->tcpStatus != CifsNew))); | |
420 | ||
421 | if (time_after(jiffies, curr_timeout) && | |
422 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
423 | ((ses->server->tcpStatus == CifsGood) || | |
424 | (ses->server->tcpStatus == CifsNew))) { | |
425 | ||
426 | unsigned long lrt; | |
427 | ||
428 | /* We timed out. Is the server still | |
429 | sending replies ? */ | |
430 | spin_lock(&GlobalMid_Lock); | |
431 | lrt = ses->server->lstrp; | |
432 | spin_unlock(&GlobalMid_Lock); | |
433 | ||
434 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 435 | Although we prefer not to time out if the |
7ee1af76 | 436 | server is still responding - we will time |
79a58d1f | 437 | out if the server takes more than 15 (or 45 |
7ee1af76 | 438 | or 180) seconds to respond to this request |
79a58d1f | 439 | and has not responded to any request from |
7ee1af76 JA |
440 | other threads on the client within 10 seconds */ |
441 | lrt += time_to_wait; | |
442 | if (time_after(jiffies, lrt)) { | |
443 | /* No replies for time_to_wait. */ | |
79a58d1f | 444 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
445 | return -1; |
446 | } | |
447 | } else { | |
448 | return 0; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
133672ef SF |
453 | |
454 | /* | |
455 | * | |
456 | * Send an SMB Request. No response info (other than return code) | |
457 | * needs to be parsed. | |
458 | * | |
459 | * flags indicate the type of request buffer and how long to wait | |
460 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
461 | * | |
462 | */ | |
463 | int | |
464 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
465 | struct smb_hdr *in_buf, int flags) | |
466 | { | |
467 | int rc; | |
468 | struct kvec iov[1]; | |
469 | int resp_buf_type; | |
470 | ||
471 | iov[0].iov_base = (char *)in_buf; | |
472 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
473 | flags |= CIFS_NO_RESP; | |
474 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
475 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
476 | ||
133672ef SF |
477 | return rc; |
478 | } | |
479 | ||
7ee1af76 | 480 | int |
79a58d1f SF |
481 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
482 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 483 | const int flags) |
7ee1af76 JA |
484 | { |
485 | int rc = 0; | |
133672ef | 486 | int long_op; |
7ee1af76 JA |
487 | unsigned int receive_len; |
488 | unsigned long timeout; | |
489 | struct mid_q_entry *midQ; | |
490 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 491 | |
133672ef SF |
492 | long_op = flags & CIFS_TIMEOUT_MASK; |
493 | ||
7ee1af76 JA |
494 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
495 | ||
496 | if ((ses == NULL) || (ses->server == NULL)) { | |
497 | cifs_small_buf_release(in_buf); | |
79a58d1f | 498 | cERROR(1, ("Null session")); |
7ee1af76 JA |
499 | return -EIO; |
500 | } | |
501 | ||
79a58d1f | 502 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
503 | cifs_small_buf_release(in_buf); |
504 | return -ENOENT; | |
505 | } | |
506 | ||
79a58d1f | 507 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
508 | to the same server. We may make this configurable later or |
509 | use ses->maxReq */ | |
510 | ||
511 | rc = wait_for_free_request(ses, long_op); | |
512 | if (rc) { | |
513 | cifs_small_buf_release(in_buf); | |
514 | return rc; | |
515 | } | |
516 | ||
79a58d1f | 517 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
518 | and avoid races inside tcp sendmsg code that could cause corruption |
519 | of smb data */ | |
520 | ||
79a58d1f | 521 | down(&ses->server->tcpSem); |
7ee1af76 JA |
522 | |
523 | rc = allocate_mid(ses, in_buf, &midQ); | |
524 | if (rc) { | |
1da177e4 | 525 | up(&ses->server->tcpSem); |
4b8f930f | 526 | cifs_small_buf_release(in_buf); |
7ee1af76 | 527 | /* Update # of requests on wire to server */ |
79a58d1f | 528 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
529 | wake_up(&ses->server->request_q); |
530 | return rc; | |
1da177e4 | 531 | } |
79a58d1f | 532 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
533 | |
534 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
535 | #ifdef CONFIG_CIFS_STATS2 |
536 | atomic_inc(&ses->server->inSend); | |
537 | #endif | |
edf1ae40 SF |
538 | rc = smb_send2(ses->server, iov, n_vec, |
539 | (struct sockaddr *) &(ses->server->addr.sockAddr), | |
540 | ses->server->noblocksnd); | |
131afd0b SF |
541 | #ifdef CONFIG_CIFS_STATS2 |
542 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 543 | midQ->when_sent = jiffies; |
131afd0b | 544 | #endif |
7ee1af76 JA |
545 | |
546 | up(&ses->server->tcpSem); | |
547 | cifs_small_buf_release(in_buf); | |
548 | ||
79a58d1f | 549 | if (rc < 0) |
7ee1af76 | 550 | goto out; |
4b8f930f | 551 | |
133672ef SF |
552 | if (long_op == CIFS_STD_OP) |
553 | timeout = 15 * HZ; | |
554 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 555 | timeout = 180 * HZ; |
133672ef | 556 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 557 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 558 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
559 | else if (long_op == CIFS_ASYNC_OP) |
560 | goto out; | |
561 | else if (long_op == CIFS_BLOCKING_OP) | |
562 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
563 | else { | |
564 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
565 | rc = -EIO; | |
566 | goto out; | |
567 | } | |
7ee1af76 | 568 | |
79a58d1f | 569 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
570 | due to last connection to this server being unmounted */ |
571 | if (signal_pending(current)) { | |
572 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 573 | but we still give response a chance to complete */ |
d6e04ae6 | 574 | timeout = 2 * HZ; |
79a58d1f | 575 | } |
d6e04ae6 SF |
576 | |
577 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 578 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
579 | |
580 | spin_lock(&GlobalMid_Lock); | |
581 | if (midQ->resp_buf) { | |
582 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 583 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 584 | } else { |
79a58d1f | 585 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 586 | midQ->command, midQ->mid)); |
79a58d1f SF |
587 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
588 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
589 | rc = -EHOSTDOWN; |
590 | else { | |
591 | ses->server->tcpStatus = CifsNeedReconnect; | |
592 | midQ->midState = MID_RETRY_NEEDED; | |
593 | } | |
594 | } | |
595 | ||
596 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 597 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 598 | rc = -EAGAIN; |
79a58d1f | 599 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
600 | } else { |
601 | rc = -EIO; | |
602 | } | |
603 | } | |
604 | spin_unlock(&GlobalMid_Lock); | |
605 | DeleteMidQEntry(midQ); | |
7ee1af76 | 606 | /* Update # of requests on wire to server */ |
79a58d1f | 607 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 608 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
609 | return rc; |
610 | } | |
50c2f753 | 611 | |
d6e04ae6 SF |
612 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
613 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
614 | receive_len, xid)); | |
615 | rc = -EIO; | |
616 | } else { /* rcvd frame is ok */ | |
79a58d1f | 617 | if (midQ->resp_buf && |
d6e04ae6 | 618 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 619 | |
ec637e3f | 620 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 621 | if (midQ->largeBuf) |
ec637e3f SF |
622 | *pRespBufType = CIFS_LARGE_BUFFER; |
623 | else | |
624 | *pRespBufType = CIFS_SMALL_BUFFER; | |
625 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 626 | |
ec637e3f | 627 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 628 | /* convert the length into a more usable form */ |
79a58d1f | 629 | if ((receive_len > 24) && |
d6e04ae6 SF |
630 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
631 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 632 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 633 | &ses->server->mac_signing_key, |
d6e04ae6 | 634 | midQ->sequence_number+1); |
79a58d1f SF |
635 | if (rc) { |
636 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
637 | /* BB FIXME add code to kill session */ |
638 | } | |
639 | } | |
640 | ||
d6e04ae6 | 641 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
642 | rc = map_smb_to_linux_error(midQ->resp_buf, |
643 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
644 | |
645 | /* convert ByteCount if necessary */ | |
26f57364 SF |
646 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
647 | /* do not count RFC1001 header */ + | |
ec637e3f | 648 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 649 | BCC(midQ->resp_buf) = |
ec637e3f | 650 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
651 | if ((flags & CIFS_NO_RESP) == 0) |
652 | midQ->resp_buf = NULL; /* mark it so buf will | |
653 | not be freed by | |
654 | DeleteMidQEntry */ | |
d6e04ae6 SF |
655 | } else { |
656 | rc = -EIO; | |
79a58d1f | 657 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
658 | } |
659 | } | |
1da177e4 | 660 | |
7ee1af76 | 661 | out: |
7ee1af76 | 662 | DeleteMidQEntry(midQ); |
79a58d1f | 663 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 664 | wake_up(&ses->server->request_q); |
1da177e4 | 665 | |
d6e04ae6 SF |
666 | return rc; |
667 | } | |
1da177e4 LT |
668 | |
669 | int | |
670 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
671 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
672 | int *pbytes_returned, const int long_op) | |
673 | { | |
674 | int rc = 0; | |
675 | unsigned int receive_len; | |
676 | unsigned long timeout; | |
677 | struct mid_q_entry *midQ; | |
678 | ||
679 | if (ses == NULL) { | |
79a58d1f | 680 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
681 | return -EIO; |
682 | } | |
79a58d1f SF |
683 | if (ses->server == NULL) { |
684 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
685 | return -EIO; |
686 | } | |
687 | ||
79a58d1f | 688 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
689 | return -ENOENT; |
690 | ||
79a58d1f | 691 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
692 | to the same server. We may make this configurable later or |
693 | use ses->maxReq */ | |
1da177e4 | 694 | |
7ee1af76 JA |
695 | rc = wait_for_free_request(ses, long_op); |
696 | if (rc) | |
697 | return rc; | |
698 | ||
79a58d1f | 699 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
700 | and avoid races inside tcp sendmsg code that could cause corruption |
701 | of smb data */ | |
702 | ||
79a58d1f | 703 | down(&ses->server->tcpSem); |
1da177e4 | 704 | |
7ee1af76 JA |
705 | rc = allocate_mid(ses, in_buf, &midQ); |
706 | if (rc) { | |
1da177e4 | 707 | up(&ses->server->tcpSem); |
7ee1af76 | 708 | /* Update # of requests on wire to server */ |
79a58d1f | 709 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
710 | wake_up(&ses->server->request_q); |
711 | return rc; | |
1da177e4 LT |
712 | } |
713 | ||
714 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 715 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
716 | in_buf->smb_buf_length)); |
717 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
718 | up(&ses->server->tcpSem); |
719 | /* Update # of requests on wire to server */ | |
79a58d1f | 720 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 721 | wake_up(&ses->server->request_q); |
1da177e4 LT |
722 | return -EIO; |
723 | } | |
724 | ||
ad009ac9 | 725 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
726 | |
727 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
728 | #ifdef CONFIG_CIFS_STATS2 |
729 | atomic_inc(&ses->server->inSend); | |
730 | #endif | |
1da177e4 | 731 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
edf1ae40 SF |
732 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
733 | ses->server->noblocksnd); | |
131afd0b SF |
734 | #ifdef CONFIG_CIFS_STATS2 |
735 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 736 | midQ->when_sent = jiffies; |
131afd0b | 737 | #endif |
7ee1af76 JA |
738 | up(&ses->server->tcpSem); |
739 | ||
79a58d1f | 740 | if (rc < 0) |
7ee1af76 JA |
741 | goto out; |
742 | ||
133672ef SF |
743 | if (long_op == CIFS_STD_OP) |
744 | timeout = 15 * HZ; | |
745 | /* wait for 15 seconds or until woken up due to response arriving or | |
746 | due to last connection to this server being unmounted */ | |
747 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 748 | goto out; |
133672ef | 749 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 750 | timeout = 180 * HZ; |
133672ef | 751 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 752 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 753 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
754 | else if (long_op == CIFS_BLOCKING_OP) |
755 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
756 | else { | |
757 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
758 | rc = -EIO; | |
759 | goto out; | |
760 | } | |
761 | ||
1da177e4 LT |
762 | if (signal_pending(current)) { |
763 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 764 | but we still give response a chance to complete */ |
1da177e4 | 765 | timeout = 2 * HZ; |
79a58d1f | 766 | } |
1da177e4 LT |
767 | |
768 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 769 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
770 | |
771 | spin_lock(&GlobalMid_Lock); | |
772 | if (midQ->resp_buf) { | |
773 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 774 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 775 | } else { |
79a58d1f | 776 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 777 | midQ->command, midQ->mid)); |
79a58d1f SF |
778 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
779 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
780 | rc = -EHOSTDOWN; |
781 | else { | |
782 | ses->server->tcpStatus = CifsNeedReconnect; | |
783 | midQ->midState = MID_RETRY_NEEDED; | |
784 | } | |
785 | } | |
786 | ||
787 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 788 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 789 | rc = -EAGAIN; |
79a58d1f | 790 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
791 | } else { |
792 | rc = -EIO; | |
793 | } | |
794 | } | |
795 | spin_unlock(&GlobalMid_Lock); | |
796 | DeleteMidQEntry(midQ); | |
7ee1af76 | 797 | /* Update # of requests on wire to server */ |
79a58d1f | 798 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 799 | wake_up(&ses->server->request_q); |
1da177e4 LT |
800 | return rc; |
801 | } | |
50c2f753 | 802 | |
1da177e4 | 803 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 804 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
805 | receive_len, xid)); |
806 | rc = -EIO; | |
807 | } else { /* rcvd frame is ok */ | |
808 | ||
809 | if (midQ->resp_buf && out_buf | |
810 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
811 | out_buf->smb_buf_length = receive_len; | |
812 | memcpy((char *)out_buf + 4, | |
813 | (char *)midQ->resp_buf + 4, | |
814 | receive_len); | |
815 | ||
816 | dump_smb(out_buf, 92); | |
817 | /* convert the length into a more usable form */ | |
79a58d1f | 818 | if ((receive_len > 24) && |
ad009ac9 SF |
819 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
820 | SECMODE_SIGN_ENABLED))) { | |
821 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 822 | &ses->server->mac_signing_key, |
ad009ac9 | 823 | midQ->sequence_number+1); |
79a58d1f SF |
824 | if (rc) { |
825 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 826 | /* BB FIXME add code to kill session */ |
ad009ac9 | 827 | } |
1da177e4 LT |
828 | } |
829 | ||
830 | *pbytes_returned = out_buf->smb_buf_length; | |
831 | ||
ad009ac9 | 832 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 833 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
834 | |
835 | /* convert ByteCount if necessary */ | |
26f57364 SF |
836 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
837 | /* do not count RFC1001 header */ + | |
1da177e4 | 838 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 839 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
840 | } else { |
841 | rc = -EIO; | |
79a58d1f | 842 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
843 | } |
844 | } | |
7ee1af76 JA |
845 | |
846 | out: | |
1da177e4 | 847 | DeleteMidQEntry(midQ); |
79a58d1f | 848 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 849 | wake_up(&ses->server->request_q); |
1da177e4 | 850 | |
7ee1af76 JA |
851 | return rc; |
852 | } | |
1da177e4 | 853 | |
7ee1af76 JA |
854 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
855 | ||
856 | static int | |
857 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
858 | struct mid_q_entry *midQ) | |
859 | { | |
860 | int rc = 0; | |
861 | struct cifsSesInfo *ses = tcon->ses; | |
862 | __u16 mid = in_buf->Mid; | |
863 | ||
864 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
865 | in_buf->Mid = mid; | |
79a58d1f | 866 | down(&ses->server->tcpSem); |
7ee1af76 JA |
867 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
868 | if (rc) { | |
869 | up(&ses->server->tcpSem); | |
870 | return rc; | |
871 | } | |
872 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
873 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
874 | ses->server->noblocksnd); | |
7ee1af76 | 875 | up(&ses->server->tcpSem); |
1da177e4 | 876 | return rc; |
7ee1af76 JA |
877 | } |
878 | ||
879 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
880 | blocking lock to return. */ | |
881 | ||
882 | static int | |
883 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
884 | struct smb_hdr *in_buf, | |
885 | struct smb_hdr *out_buf) | |
886 | { | |
887 | int bytes_returned; | |
888 | struct cifsSesInfo *ses = tcon->ses; | |
889 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
890 | ||
891 | /* We just modify the current in_buf to change | |
892 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
893 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
894 | LOCKING_ANDX_CANCEL_LOCK. */ | |
895 | ||
896 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
897 | pSMB->Timeout = 0; | |
898 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
899 | ||
900 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 901 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
902 | } |
903 | ||
904 | int | |
905 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
906 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
907 | int *pbytes_returned) | |
908 | { | |
909 | int rc = 0; | |
910 | int rstart = 0; | |
911 | unsigned int receive_len; | |
912 | struct mid_q_entry *midQ; | |
913 | struct cifsSesInfo *ses; | |
914 | ||
915 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 916 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
917 | return -EIO; |
918 | } | |
919 | ses = tcon->ses; | |
920 | ||
79a58d1f SF |
921 | if (ses->server == NULL) { |
922 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
923 | return -EIO; |
924 | } | |
925 | ||
79a58d1f | 926 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
927 | return -ENOENT; |
928 | ||
79a58d1f | 929 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
930 | to the same server. We may make this configurable later or |
931 | use ses->maxReq */ | |
932 | ||
133672ef | 933 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
934 | if (rc) |
935 | return rc; | |
936 | ||
79a58d1f | 937 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
938 | and avoid races inside tcp sendmsg code that could cause corruption |
939 | of smb data */ | |
940 | ||
79a58d1f | 941 | down(&ses->server->tcpSem); |
7ee1af76 JA |
942 | |
943 | rc = allocate_mid(ses, in_buf, &midQ); | |
944 | if (rc) { | |
945 | up(&ses->server->tcpSem); | |
946 | return rc; | |
947 | } | |
948 | ||
949 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
950 | up(&ses->server->tcpSem); | |
951 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
952 | in_buf->smb_buf_length)); | |
953 | DeleteMidQEntry(midQ); | |
954 | return -EIO; | |
955 | } | |
956 | ||
957 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 958 | |
7ee1af76 JA |
959 | midQ->midState = MID_REQUEST_SUBMITTED; |
960 | #ifdef CONFIG_CIFS_STATS2 | |
961 | atomic_inc(&ses->server->inSend); | |
962 | #endif | |
963 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
964 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
965 | ses->server->noblocksnd); | |
7ee1af76 JA |
966 | #ifdef CONFIG_CIFS_STATS2 |
967 | atomic_dec(&ses->server->inSend); | |
968 | midQ->when_sent = jiffies; | |
969 | #endif | |
1da177e4 | 970 | up(&ses->server->tcpSem); |
7ee1af76 | 971 | |
79a58d1f | 972 | if (rc < 0) { |
7ee1af76 JA |
973 | DeleteMidQEntry(midQ); |
974 | return rc; | |
975 | } | |
976 | ||
977 | /* Wait for a reply - allow signals to interrupt. */ | |
978 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 979 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
980 | ((ses->server->tcpStatus != CifsGood) && |
981 | (ses->server->tcpStatus != CifsNew))); | |
982 | ||
983 | /* Were we interrupted by a signal ? */ | |
984 | if ((rc == -ERESTARTSYS) && | |
985 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
986 | ((ses->server->tcpStatus == CifsGood) || | |
987 | (ses->server->tcpStatus == CifsNew))) { | |
988 | ||
989 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
990 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
991 | blocking lock to return. */ | |
992 | ||
993 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
994 | if (rc) { | |
995 | DeleteMidQEntry(midQ); | |
996 | return rc; | |
997 | } | |
998 | } else { | |
999 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1000 | to cause the blocking lock to return. */ | |
1001 | ||
1002 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1003 | ||
1004 | /* If we get -ENOLCK back the lock may have | |
1005 | already been removed. Don't exit in this case. */ | |
1006 | if (rc && rc != -ENOLCK) { | |
1007 | DeleteMidQEntry(midQ); | |
1008 | return rc; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 1013 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
1014 | /* We got the response - restart system call. */ |
1015 | rstart = 1; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | spin_lock(&GlobalMid_Lock); | |
1020 | if (midQ->resp_buf) { | |
1021 | spin_unlock(&GlobalMid_Lock); | |
1022 | receive_len = midQ->resp_buf->smb_buf_length; | |
1023 | } else { | |
79a58d1f | 1024 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 1025 | midQ->command, midQ->mid)); |
79a58d1f SF |
1026 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
1027 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
1028 | rc = -EHOSTDOWN; |
1029 | else { | |
1030 | ses->server->tcpStatus = CifsNeedReconnect; | |
1031 | midQ->midState = MID_RETRY_NEEDED; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 1036 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 1037 | rc = -EAGAIN; |
79a58d1f | 1038 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1039 | } else { |
1040 | rc = -EIO; | |
1041 | } | |
1042 | } | |
1043 | spin_unlock(&GlobalMid_Lock); | |
1044 | DeleteMidQEntry(midQ); | |
1045 | return rc; | |
1da177e4 | 1046 | } |
50c2f753 | 1047 | |
7ee1af76 JA |
1048 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1049 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1050 | receive_len, xid)); | |
1051 | rc = -EIO; | |
1052 | } else { /* rcvd frame is ok */ | |
1053 | ||
1054 | if (midQ->resp_buf && out_buf | |
1055 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1056 | out_buf->smb_buf_length = receive_len; | |
1057 | memcpy((char *)out_buf + 4, | |
1058 | (char *)midQ->resp_buf + 4, | |
1059 | receive_len); | |
1060 | ||
1061 | dump_smb(out_buf, 92); | |
1062 | /* convert the length into a more usable form */ | |
79a58d1f | 1063 | if ((receive_len > 24) && |
7ee1af76 JA |
1064 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1065 | SECMODE_SIGN_ENABLED))) { | |
1066 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1067 | &ses->server->mac_signing_key, |
7ee1af76 | 1068 | midQ->sequence_number+1); |
79a58d1f SF |
1069 | if (rc) { |
1070 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1071 | /* BB FIXME add code to kill session */ |
1072 | } | |
1073 | } | |
1074 | ||
1075 | *pbytes_returned = out_buf->smb_buf_length; | |
1076 | ||
1077 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1078 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1079 | |
7ee1af76 | 1080 | /* convert ByteCount if necessary */ |
26f57364 SF |
1081 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1082 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1083 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1084 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1085 | } else { | |
1086 | rc = -EIO; | |
79a58d1f | 1087 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1088 | } |
1089 | } | |
1090 | DeleteMidQEntry(midQ); | |
1091 | if (rstart && rc == -EACCES) | |
1092 | return -ERESTARTSYS; | |
1da177e4 LT |
1093 | return rc; |
1094 | } |