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> | |
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 * | |
24b9b06b | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
24b9b06b | 44 | if (server == NULL) { |
1da177e4 LT |
45 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
46 | return NULL; | |
47 | } | |
50c2f753 | 48 | |
232087cb | 49 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
50 | if (temp == NULL) |
51 | return temp; | |
52 | else { | |
26f57364 | 53 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
54 | temp->mid = smb_buffer->Mid; /* always LE */ |
55 | temp->pid = current->pid; | |
56 | temp->command = smb_buffer->Command; | |
57 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
59 | /* when mid allocated can be before when sent */ | |
60 | temp->when_alloc = jiffies; | |
1da177e4 LT |
61 | temp->tsk = current; |
62 | } | |
63 | ||
64 | spin_lock(&GlobalMid_Lock); | |
24b9b06b | 65 | list_add_tail(&temp->qhead, &server->pending_mid_q); |
1da177e4 LT |
66 | atomic_inc(&midCount); |
67 | temp->midState = MID_REQUEST_ALLOCATED; | |
68 | spin_unlock(&GlobalMid_Lock); | |
69 | return temp; | |
70 | } | |
71 | ||
72 | static void | |
73 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
74 | { | |
1047abc1 SF |
75 | #ifdef CONFIG_CIFS_STATS2 |
76 | unsigned long now; | |
77 | #endif | |
1da177e4 LT |
78 | spin_lock(&GlobalMid_Lock); |
79 | midEntry->midState = MID_FREE; | |
80 | list_del(&midEntry->qhead); | |
81 | atomic_dec(&midCount); | |
82 | spin_unlock(&GlobalMid_Lock); | |
79a58d1f | 83 | if (midEntry->largeBuf) |
b8643e1b SF |
84 | cifs_buf_release(midEntry->resp_buf); |
85 | else | |
86 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
87 | #ifdef CONFIG_CIFS_STATS2 |
88 | now = jiffies; | |
89 | /* commands taking longer than one second are indications that | |
90 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
91 | if ((now - midEntry->when_alloc) > HZ) { |
92 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
93 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
94 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
95 | midEntry->command, midEntry->mid); | |
96 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
97 | now - midEntry->when_alloc, | |
98 | now - midEntry->when_sent, | |
99 | now - midEntry->when_received); | |
100 | } | |
101 | } | |
102 | #endif | |
1da177e4 LT |
103 | mempool_free(midEntry, cifs_mid_poolp); |
104 | } | |
105 | ||
d6e04ae6 | 106 | static int |
0496e02d | 107 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
108 | { |
109 | int rc = 0; | |
110 | int i = 0; | |
111 | struct msghdr smb_msg; | |
3e84469d SF |
112 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
113 | unsigned int len = iov[0].iov_len; | |
114 | unsigned int total_len; | |
115 | int first_vec = 0; | |
7ee1af76 | 116 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 117 | struct socket *ssocket = server->ssocket; |
50c2f753 | 118 | |
79a58d1f | 119 | if (ssocket == NULL) |
1da177e4 | 120 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 121 | |
0496e02d | 122 | smb_msg.msg_name = (struct sockaddr *) &server->addr.sockAddr; |
26f57364 | 123 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
124 | smb_msg.msg_control = NULL; |
125 | smb_msg.msg_controllen = 0; | |
0496e02d | 126 | if (server->noblocksnd) |
edf1ae40 SF |
127 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
128 | else | |
129 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
130 | |
131 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
132 | area, and byte area if necessary, is converted to littleendian in |
133 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
134 | Flags2 is converted in SendReceive */ |
135 | ||
3e84469d SF |
136 | |
137 | total_len = 0; | |
138 | for (i = 0; i < n_vec; i++) | |
139 | total_len += iov[i].iov_len; | |
140 | ||
1da177e4 | 141 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 142 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
143 | dump_smb(smb_buffer, len); |
144 | ||
17680356 | 145 | i = 0; |
3e84469d SF |
146 | while (total_len) { |
147 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
148 | n_vec - first_vec, total_len); | |
1da177e4 LT |
149 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
150 | i++; | |
da505c38 SF |
151 | /* if blocking send we try 3 times, since each can block |
152 | for 5 seconds. For nonblocking we have to try more | |
153 | but wait increasing amounts of time allowing time for | |
154 | socket to clear. The overall time we wait in either | |
155 | case to send on the socket is about 15 seconds. | |
156 | Similarly we wait for 15 seconds for | |
157 | a response from the server in SendReceive[2] | |
158 | for the server to send a response back for | |
159 | most types of requests (except SMB Write | |
160 | past end of file which can be slow, and | |
161 | blocking lock operations). NFS waits slightly longer | |
162 | than CIFS, but this can make it take longer for | |
163 | nonresponsive servers to be detected and 15 seconds | |
164 | is more than enough time for modern networks to | |
165 | send a packet. In most cases if we fail to send | |
166 | after the retries we will kill the socket and | |
167 | reconnect which may clear the network problem. | |
168 | */ | |
169 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
1da177e4 | 170 | cERROR(1, |
68058e75 | 171 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
172 | ssocket)); |
173 | rc = -EAGAIN; | |
174 | break; | |
175 | } | |
68058e75 | 176 | msleep(1 << i); |
1da177e4 LT |
177 | continue; |
178 | } | |
79a58d1f | 179 | if (rc < 0) |
1da177e4 | 180 | break; |
3e84469d | 181 | |
61de800d SF |
182 | if (rc == total_len) { |
183 | total_len = 0; | |
184 | break; | |
185 | } else if (rc > total_len) { | |
186 | cERROR(1, ("sent %d requested %d", rc, total_len)); | |
3e84469d SF |
187 | break; |
188 | } | |
79a58d1f | 189 | if (rc == 0) { |
3e84469d SF |
190 | /* should never happen, letting socket clear before |
191 | retrying is our only obvious option here */ | |
79a58d1f | 192 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
193 | msleep(500); |
194 | continue; | |
d6e04ae6 | 195 | } |
3e84469d | 196 | total_len -= rc; |
68058e75 | 197 | /* the line below resets i */ |
3e84469d SF |
198 | for (i = first_vec; i < n_vec; i++) { |
199 | if (iov[i].iov_len) { | |
200 | if (rc > iov[i].iov_len) { | |
201 | rc -= iov[i].iov_len; | |
202 | iov[i].iov_len = 0; | |
203 | } else { | |
204 | iov[i].iov_base += rc; | |
205 | iov[i].iov_len -= rc; | |
206 | first_vec = i; | |
207 | break; | |
208 | } | |
209 | } | |
d6e04ae6 | 210 | } |
5e1253b5 | 211 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
212 | } |
213 | ||
edf1ae40 SF |
214 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
215 | cFYI(1, ("partial send (%d remaining), terminating session", | |
216 | total_len)); | |
217 | /* If we have only sent part of an SMB then the next SMB | |
218 | could be taken as the remainder of this one. We need | |
219 | to kill the socket so the server throws away the partial | |
220 | SMB */ | |
221 | server->tcpStatus = CifsNeedReconnect; | |
222 | } | |
223 | ||
1da177e4 | 224 | if (rc < 0) { |
79a58d1f | 225 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 226 | } else |
1da177e4 | 227 | rc = 0; |
1da177e4 | 228 | |
7ee1af76 JA |
229 | /* Don't want to modify the buffer as a |
230 | side effect of this call. */ | |
231 | smb_buffer->smb_buf_length = smb_buf_length; | |
232 | ||
1da177e4 LT |
233 | return rc; |
234 | } | |
235 | ||
0496e02d JL |
236 | int |
237 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
238 | unsigned int smb_buf_length) | |
239 | { | |
240 | struct kvec iov; | |
241 | ||
242 | iov.iov_base = smb_buffer; | |
243 | iov.iov_len = smb_buf_length + 4; | |
244 | ||
245 | return smb_sendv(server, &iov, 1); | |
246 | } | |
247 | ||
7ee1af76 | 248 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 249 | { |
133672ef | 250 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
251 | /* oplock breaks must not be held up */ |
252 | atomic_inc(&ses->server->inFlight); | |
27a97a61 VL |
253 | return 0; |
254 | } | |
255 | ||
256 | spin_lock(&GlobalMid_Lock); | |
257 | while (1) { | |
258 | if (atomic_read(&ses->server->inFlight) >= | |
259 | cifs_max_pending){ | |
260 | spin_unlock(&GlobalMid_Lock); | |
131afd0b | 261 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 262 | atomic_inc(&ses->server->num_waiters); |
131afd0b | 263 | #endif |
27a97a61 VL |
264 | wait_event(ses->server->request_q, |
265 | atomic_read(&ses->server->inFlight) | |
266 | < cifs_max_pending); | |
131afd0b | 267 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 268 | atomic_dec(&ses->server->num_waiters); |
131afd0b | 269 | #endif |
27a97a61 VL |
270 | spin_lock(&GlobalMid_Lock); |
271 | } else { | |
272 | if (ses->server->tcpStatus == CifsExiting) { | |
1da177e4 | 273 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 274 | return -ENOENT; |
1da177e4 | 275 | } |
27a97a61 VL |
276 | |
277 | /* can not count locking commands against total | |
278 | as they are allowed to block on server */ | |
279 | ||
280 | /* update # of requests on the wire to server */ | |
281 | if (long_op != CIFS_BLOCKING_OP) | |
282 | atomic_inc(&ses->server->inFlight); | |
283 | spin_unlock(&GlobalMid_Lock); | |
284 | break; | |
1da177e4 LT |
285 | } |
286 | } | |
7ee1af76 JA |
287 | return 0; |
288 | } | |
1da177e4 | 289 | |
7ee1af76 JA |
290 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
291 | struct mid_q_entry **ppmidQ) | |
292 | { | |
1da177e4 | 293 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 294 | return -ENOENT; |
8fbbd365 VL |
295 | } |
296 | ||
297 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
79a58d1f | 298 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 299 | return -EAGAIN; |
8fbbd365 VL |
300 | } |
301 | ||
302 | if (ses->status != CifsGood) { | |
1da177e4 | 303 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 304 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 305 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 306 | return -EAGAIN; |
ad7a2926 | 307 | /* else ok - we are setting up session */ |
1da177e4 | 308 | } |
24b9b06b | 309 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 310 | if (*ppmidQ == NULL) |
7ee1af76 | 311 | return -ENOMEM; |
7ee1af76 JA |
312 | return 0; |
313 | } | |
314 | ||
79a58d1f | 315 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
316 | struct mid_q_entry *midQ, |
317 | unsigned long timeout, | |
318 | unsigned long time_to_wait) | |
319 | { | |
320 | unsigned long curr_timeout; | |
321 | ||
322 | for (;;) { | |
323 | curr_timeout = timeout + jiffies; | |
85705524 JL |
324 | wait_event_timeout(ses->server->response_q, |
325 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
326 | |
327 | if (time_after(jiffies, curr_timeout) && | |
328 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
329 | ((ses->server->tcpStatus == CifsGood) || | |
330 | (ses->server->tcpStatus == CifsNew))) { | |
331 | ||
332 | unsigned long lrt; | |
333 | ||
334 | /* We timed out. Is the server still | |
335 | sending replies ? */ | |
336 | spin_lock(&GlobalMid_Lock); | |
337 | lrt = ses->server->lstrp; | |
338 | spin_unlock(&GlobalMid_Lock); | |
339 | ||
340 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 341 | Although we prefer not to time out if the |
7ee1af76 | 342 | server is still responding - we will time |
79a58d1f | 343 | out if the server takes more than 15 (or 45 |
7ee1af76 | 344 | or 180) seconds to respond to this request |
79a58d1f | 345 | and has not responded to any request from |
7ee1af76 JA |
346 | other threads on the client within 10 seconds */ |
347 | lrt += time_to_wait; | |
348 | if (time_after(jiffies, lrt)) { | |
349 | /* No replies for time_to_wait. */ | |
79a58d1f | 350 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
351 | return -1; |
352 | } | |
353 | } else { | |
354 | return 0; | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
133672ef SF |
359 | |
360 | /* | |
361 | * | |
362 | * Send an SMB Request. No response info (other than return code) | |
363 | * needs to be parsed. | |
364 | * | |
365 | * flags indicate the type of request buffer and how long to wait | |
366 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
367 | * | |
368 | */ | |
369 | int | |
370 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
371 | struct smb_hdr *in_buf, int flags) | |
372 | { | |
373 | int rc; | |
374 | struct kvec iov[1]; | |
375 | int resp_buf_type; | |
376 | ||
377 | iov[0].iov_base = (char *)in_buf; | |
378 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
379 | flags |= CIFS_NO_RESP; | |
380 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
381 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
382 | ||
133672ef SF |
383 | return rc; |
384 | } | |
385 | ||
7ee1af76 | 386 | int |
79a58d1f SF |
387 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
388 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 389 | const int flags) |
7ee1af76 JA |
390 | { |
391 | int rc = 0; | |
133672ef | 392 | int long_op; |
7ee1af76 JA |
393 | unsigned int receive_len; |
394 | unsigned long timeout; | |
395 | struct mid_q_entry *midQ; | |
396 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 397 | |
133672ef SF |
398 | long_op = flags & CIFS_TIMEOUT_MASK; |
399 | ||
7ee1af76 JA |
400 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
401 | ||
402 | if ((ses == NULL) || (ses->server == NULL)) { | |
403 | cifs_small_buf_release(in_buf); | |
79a58d1f | 404 | cERROR(1, ("Null session")); |
7ee1af76 JA |
405 | return -EIO; |
406 | } | |
407 | ||
79a58d1f | 408 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
409 | cifs_small_buf_release(in_buf); |
410 | return -ENOENT; | |
411 | } | |
412 | ||
79a58d1f | 413 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
414 | to the same server. We may make this configurable later or |
415 | use ses->maxReq */ | |
416 | ||
417 | rc = wait_for_free_request(ses, long_op); | |
418 | if (rc) { | |
419 | cifs_small_buf_release(in_buf); | |
420 | return rc; | |
421 | } | |
422 | ||
79a58d1f | 423 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
424 | and avoid races inside tcp sendmsg code that could cause corruption |
425 | of smb data */ | |
426 | ||
72ca545b | 427 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
428 | |
429 | rc = allocate_mid(ses, in_buf, &midQ); | |
430 | if (rc) { | |
72ca545b | 431 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 432 | cifs_small_buf_release(in_buf); |
7ee1af76 | 433 | /* Update # of requests on wire to server */ |
79a58d1f | 434 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
435 | wake_up(&ses->server->request_q); |
436 | return rc; | |
1da177e4 | 437 | } |
79a58d1f | 438 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
439 | if (rc) { |
440 | mutex_unlock(&ses->server->srv_mutex); | |
441 | cifs_small_buf_release(in_buf); | |
442 | goto out; | |
443 | } | |
1da177e4 LT |
444 | |
445 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
446 | #ifdef CONFIG_CIFS_STATS2 |
447 | atomic_inc(&ses->server->inSend); | |
448 | #endif | |
0496e02d | 449 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
450 | #ifdef CONFIG_CIFS_STATS2 |
451 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 452 | midQ->when_sent = jiffies; |
131afd0b | 453 | #endif |
7ee1af76 | 454 | |
72ca545b | 455 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
456 | cifs_small_buf_release(in_buf); |
457 | ||
79a58d1f | 458 | if (rc < 0) |
7ee1af76 | 459 | goto out; |
4b8f930f | 460 | |
133672ef SF |
461 | if (long_op == CIFS_STD_OP) |
462 | timeout = 15 * HZ; | |
463 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 464 | timeout = 180 * HZ; |
133672ef | 465 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 466 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 467 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
468 | else if (long_op == CIFS_ASYNC_OP) |
469 | goto out; | |
470 | else if (long_op == CIFS_BLOCKING_OP) | |
471 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
472 | else { | |
473 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
474 | rc = -EIO; | |
475 | goto out; | |
476 | } | |
7ee1af76 | 477 | |
79a58d1f | 478 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
479 | due to last connection to this server being unmounted */ |
480 | if (signal_pending(current)) { | |
481 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 482 | but we still give response a chance to complete */ |
d6e04ae6 | 483 | timeout = 2 * HZ; |
79a58d1f | 484 | } |
d6e04ae6 SF |
485 | |
486 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 487 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
488 | |
489 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a VL |
490 | |
491 | if (midQ->resp_buf == NULL) { | |
79a58d1f | 492 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 493 | midQ->command, midQ->mid)); |
79a58d1f SF |
494 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
495 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
496 | rc = -EHOSTDOWN; |
497 | else { | |
498 | ses->server->tcpStatus = CifsNeedReconnect; | |
499 | midQ->midState = MID_RETRY_NEEDED; | |
500 | } | |
501 | } | |
502 | ||
503 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 504 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 505 | rc = -EAGAIN; |
79a58d1f | 506 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
507 | } else { |
508 | rc = -EIO; | |
509 | } | |
510 | } | |
511 | spin_unlock(&GlobalMid_Lock); | |
512 | DeleteMidQEntry(midQ); | |
7ee1af76 | 513 | /* Update # of requests on wire to server */ |
79a58d1f | 514 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 515 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
516 | return rc; |
517 | } | |
50c2f753 | 518 | |
8e4f2e8a VL |
519 | spin_unlock(&GlobalMid_Lock); |
520 | receive_len = midQ->resp_buf->smb_buf_length; | |
521 | ||
d6e04ae6 SF |
522 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
523 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
524 | receive_len, xid)); | |
525 | rc = -EIO; | |
2b2bdfba SF |
526 | goto out; |
527 | } | |
528 | ||
529 | /* rcvd frame is ok */ | |
530 | ||
531 | if (midQ->resp_buf && | |
532 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
533 | ||
534 | iov[0].iov_base = (char *)midQ->resp_buf; | |
535 | if (midQ->largeBuf) | |
536 | *pRespBufType = CIFS_LARGE_BUFFER; | |
537 | else | |
538 | *pRespBufType = CIFS_SMALL_BUFFER; | |
539 | iov[0].iov_len = receive_len + 4; | |
540 | ||
541 | dump_smb(midQ->resp_buf, 80); | |
542 | /* convert the length into a more usable form */ | |
543 | if ((receive_len > 24) && | |
544 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
545 | SECMODE_SIGN_ENABLED))) { | |
546 | rc = cifs_verify_signature(midQ->resp_buf, | |
b609f06a | 547 | &ses->server->mac_signing_key, |
d6e04ae6 | 548 | midQ->sequence_number+1); |
2b2bdfba SF |
549 | if (rc) { |
550 | cERROR(1, ("Unexpected SMB signature")); | |
551 | /* BB FIXME add code to kill session */ | |
d6e04ae6 | 552 | } |
d6e04ae6 | 553 | } |
2b2bdfba SF |
554 | |
555 | /* BB special case reconnect tid and uid here? */ | |
556 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
557 | flags & CIFS_LOG_ERROR); | |
558 | ||
559 | /* convert ByteCount if necessary */ | |
560 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
561 | /* do not count RFC1001 header */ + | |
562 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
563 | BCC(midQ->resp_buf) = | |
564 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
565 | if ((flags & CIFS_NO_RESP) == 0) | |
566 | midQ->resp_buf = NULL; /* mark it so buf will | |
567 | not be freed by | |
568 | DeleteMidQEntry */ | |
569 | } else { | |
570 | rc = -EIO; | |
571 | cFYI(1, ("Bad MID state?")); | |
d6e04ae6 | 572 | } |
1da177e4 | 573 | |
7ee1af76 | 574 | out: |
7ee1af76 | 575 | DeleteMidQEntry(midQ); |
79a58d1f | 576 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 577 | wake_up(&ses->server->request_q); |
1da177e4 | 578 | |
d6e04ae6 SF |
579 | return rc; |
580 | } | |
1da177e4 LT |
581 | |
582 | int | |
583 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
584 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
585 | int *pbytes_returned, const int long_op) | |
586 | { | |
587 | int rc = 0; | |
588 | unsigned int receive_len; | |
589 | unsigned long timeout; | |
590 | struct mid_q_entry *midQ; | |
591 | ||
592 | if (ses == NULL) { | |
79a58d1f | 593 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
594 | return -EIO; |
595 | } | |
79a58d1f SF |
596 | if (ses->server == NULL) { |
597 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
598 | return -EIO; |
599 | } | |
600 | ||
79a58d1f | 601 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
602 | return -ENOENT; |
603 | ||
79a58d1f | 604 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
605 | to the same server. We may make this configurable later or |
606 | use ses->maxReq */ | |
1da177e4 | 607 | |
6d9c6d54 VL |
608 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
609 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
610 | in_buf->smb_buf_length)); | |
611 | return -EIO; | |
612 | } | |
613 | ||
7ee1af76 JA |
614 | rc = wait_for_free_request(ses, long_op); |
615 | if (rc) | |
616 | return rc; | |
617 | ||
79a58d1f | 618 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
619 | and avoid races inside tcp sendmsg code that could cause corruption |
620 | of smb data */ | |
621 | ||
72ca545b | 622 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 623 | |
7ee1af76 JA |
624 | rc = allocate_mid(ses, in_buf, &midQ); |
625 | if (rc) { | |
72ca545b | 626 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 627 | /* Update # of requests on wire to server */ |
79a58d1f | 628 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
629 | wake_up(&ses->server->request_q); |
630 | return rc; | |
1da177e4 LT |
631 | } |
632 | ||
ad009ac9 | 633 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
634 | if (rc) { |
635 | mutex_unlock(&ses->server->srv_mutex); | |
636 | goto out; | |
637 | } | |
1da177e4 LT |
638 | |
639 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
640 | #ifdef CONFIG_CIFS_STATS2 |
641 | atomic_inc(&ses->server->inSend); | |
642 | #endif | |
0496e02d | 643 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
644 | #ifdef CONFIG_CIFS_STATS2 |
645 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 646 | midQ->when_sent = jiffies; |
131afd0b | 647 | #endif |
72ca545b | 648 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 649 | |
79a58d1f | 650 | if (rc < 0) |
7ee1af76 JA |
651 | goto out; |
652 | ||
133672ef SF |
653 | if (long_op == CIFS_STD_OP) |
654 | timeout = 15 * HZ; | |
655 | /* wait for 15 seconds or until woken up due to response arriving or | |
656 | due to last connection to this server being unmounted */ | |
657 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 658 | goto out; |
133672ef | 659 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 660 | timeout = 180 * HZ; |
133672ef | 661 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 662 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 663 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
664 | else if (long_op == CIFS_BLOCKING_OP) |
665 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
666 | else { | |
667 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
668 | rc = -EIO; | |
669 | goto out; | |
670 | } | |
671 | ||
1da177e4 LT |
672 | if (signal_pending(current)) { |
673 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 674 | but we still give response a chance to complete */ |
1da177e4 | 675 | timeout = 2 * HZ; |
79a58d1f | 676 | } |
1da177e4 LT |
677 | |
678 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 679 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
680 | |
681 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a | 682 | if (midQ->resp_buf == NULL) { |
79a58d1f | 683 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 684 | midQ->command, midQ->mid)); |
79a58d1f SF |
685 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
686 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
687 | rc = -EHOSTDOWN; |
688 | else { | |
689 | ses->server->tcpStatus = CifsNeedReconnect; | |
690 | midQ->midState = MID_RETRY_NEEDED; | |
691 | } | |
692 | } | |
693 | ||
694 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 695 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 696 | rc = -EAGAIN; |
79a58d1f | 697 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
698 | } else { |
699 | rc = -EIO; | |
700 | } | |
701 | } | |
702 | spin_unlock(&GlobalMid_Lock); | |
703 | DeleteMidQEntry(midQ); | |
7ee1af76 | 704 | /* Update # of requests on wire to server */ |
79a58d1f | 705 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 706 | wake_up(&ses->server->request_q); |
1da177e4 LT |
707 | return rc; |
708 | } | |
50c2f753 | 709 | |
8e4f2e8a VL |
710 | spin_unlock(&GlobalMid_Lock); |
711 | receive_len = midQ->resp_buf->smb_buf_length; | |
712 | ||
1da177e4 | 713 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 714 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
715 | receive_len, xid)); |
716 | rc = -EIO; | |
2b2bdfba SF |
717 | goto out; |
718 | } | |
719 | ||
720 | /* rcvd frame is ok */ | |
721 | ||
722 | if (midQ->resp_buf && out_buf | |
723 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
724 | out_buf->smb_buf_length = receive_len; | |
725 | memcpy((char *)out_buf + 4, | |
726 | (char *)midQ->resp_buf + 4, | |
727 | receive_len); | |
728 | ||
729 | dump_smb(out_buf, 92); | |
730 | /* convert the length into a more usable form */ | |
731 | if ((receive_len > 24) && | |
732 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
733 | SECMODE_SIGN_ENABLED))) { | |
734 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 735 | &ses->server->mac_signing_key, |
ad009ac9 | 736 | midQ->sequence_number+1); |
2b2bdfba SF |
737 | if (rc) { |
738 | cERROR(1, ("Unexpected SMB signature")); | |
739 | /* BB FIXME add code to kill session */ | |
1da177e4 | 740 | } |
2b2bdfba | 741 | } |
1da177e4 | 742 | |
2b2bdfba | 743 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 744 | |
2b2bdfba SF |
745 | /* BB special case reconnect tid and uid here? */ |
746 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 747 | |
2b2bdfba SF |
748 | /* convert ByteCount if necessary */ |
749 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
750 | /* do not count RFC1001 header */ + | |
751 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
752 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
753 | } else { | |
754 | rc = -EIO; | |
755 | cERROR(1, ("Bad MID state?")); | |
1da177e4 | 756 | } |
7ee1af76 JA |
757 | |
758 | out: | |
1da177e4 | 759 | DeleteMidQEntry(midQ); |
79a58d1f | 760 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 761 | wake_up(&ses->server->request_q); |
1da177e4 | 762 | |
7ee1af76 JA |
763 | return rc; |
764 | } | |
1da177e4 | 765 | |
7ee1af76 JA |
766 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
767 | ||
768 | static int | |
769 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
770 | struct mid_q_entry *midQ) | |
771 | { | |
772 | int rc = 0; | |
773 | struct cifsSesInfo *ses = tcon->ses; | |
774 | __u16 mid = in_buf->Mid; | |
775 | ||
776 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
777 | in_buf->Mid = mid; | |
72ca545b | 778 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
779 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
780 | if (rc) { | |
72ca545b | 781 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
782 | return rc; |
783 | } | |
0496e02d | 784 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 785 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 786 | return rc; |
7ee1af76 JA |
787 | } |
788 | ||
789 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
790 | blocking lock to return. */ | |
791 | ||
792 | static int | |
793 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
794 | struct smb_hdr *in_buf, | |
795 | struct smb_hdr *out_buf) | |
796 | { | |
797 | int bytes_returned; | |
798 | struct cifsSesInfo *ses = tcon->ses; | |
799 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
800 | ||
801 | /* We just modify the current in_buf to change | |
802 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
803 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
804 | LOCKING_ANDX_CANCEL_LOCK. */ | |
805 | ||
806 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
807 | pSMB->Timeout = 0; | |
808 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
809 | ||
810 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 811 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
812 | } |
813 | ||
814 | int | |
815 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
816 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
817 | int *pbytes_returned) | |
818 | { | |
819 | int rc = 0; | |
820 | int rstart = 0; | |
821 | unsigned int receive_len; | |
822 | struct mid_q_entry *midQ; | |
823 | struct cifsSesInfo *ses; | |
824 | ||
825 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 826 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
827 | return -EIO; |
828 | } | |
829 | ses = tcon->ses; | |
830 | ||
79a58d1f SF |
831 | if (ses->server == NULL) { |
832 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
833 | return -EIO; |
834 | } | |
835 | ||
79a58d1f | 836 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
837 | return -ENOENT; |
838 | ||
79a58d1f | 839 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
840 | to the same server. We may make this configurable later or |
841 | use ses->maxReq */ | |
842 | ||
6d9c6d54 VL |
843 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
844 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
845 | in_buf->smb_buf_length)); | |
846 | return -EIO; | |
847 | } | |
848 | ||
133672ef | 849 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
850 | if (rc) |
851 | return rc; | |
852 | ||
79a58d1f | 853 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
854 | and avoid races inside tcp sendmsg code that could cause corruption |
855 | of smb data */ | |
856 | ||
72ca545b | 857 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
858 | |
859 | rc = allocate_mid(ses, in_buf, &midQ); | |
860 | if (rc) { | |
72ca545b | 861 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
862 | return rc; |
863 | } | |
864 | ||
7ee1af76 | 865 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
866 | if (rc) { |
867 | DeleteMidQEntry(midQ); | |
868 | mutex_unlock(&ses->server->srv_mutex); | |
869 | return rc; | |
870 | } | |
1da177e4 | 871 | |
7ee1af76 JA |
872 | midQ->midState = MID_REQUEST_SUBMITTED; |
873 | #ifdef CONFIG_CIFS_STATS2 | |
874 | atomic_inc(&ses->server->inSend); | |
875 | #endif | |
0496e02d | 876 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
877 | #ifdef CONFIG_CIFS_STATS2 |
878 | atomic_dec(&ses->server->inSend); | |
879 | midQ->when_sent = jiffies; | |
880 | #endif | |
72ca545b | 881 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 882 | |
79a58d1f | 883 | if (rc < 0) { |
7ee1af76 JA |
884 | DeleteMidQEntry(midQ); |
885 | return rc; | |
886 | } | |
887 | ||
888 | /* Wait for a reply - allow signals to interrupt. */ | |
889 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 890 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
891 | ((ses->server->tcpStatus != CifsGood) && |
892 | (ses->server->tcpStatus != CifsNew))); | |
893 | ||
894 | /* Were we interrupted by a signal ? */ | |
895 | if ((rc == -ERESTARTSYS) && | |
896 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
897 | ((ses->server->tcpStatus == CifsGood) || | |
898 | (ses->server->tcpStatus == CifsNew))) { | |
899 | ||
900 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
901 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
902 | blocking lock to return. */ | |
903 | ||
904 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
905 | if (rc) { | |
906 | DeleteMidQEntry(midQ); | |
907 | return rc; | |
908 | } | |
909 | } else { | |
910 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
911 | to cause the blocking lock to return. */ | |
912 | ||
913 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
914 | ||
915 | /* If we get -ENOLCK back the lock may have | |
916 | already been removed. Don't exit in this case. */ | |
917 | if (rc && rc != -ENOLCK) { | |
918 | DeleteMidQEntry(midQ); | |
919 | return rc; | |
920 | } | |
921 | } | |
922 | ||
923 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 924 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
925 | /* We got the response - restart system call. */ |
926 | rstart = 1; | |
927 | } | |
928 | } | |
929 | ||
930 | spin_lock(&GlobalMid_Lock); | |
931 | if (midQ->resp_buf) { | |
932 | spin_unlock(&GlobalMid_Lock); | |
933 | receive_len = midQ->resp_buf->smb_buf_length; | |
934 | } else { | |
79a58d1f | 935 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 936 | midQ->command, midQ->mid)); |
79a58d1f SF |
937 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
938 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
939 | rc = -EHOSTDOWN; |
940 | else { | |
941 | ses->server->tcpStatus = CifsNeedReconnect; | |
942 | midQ->midState = MID_RETRY_NEEDED; | |
943 | } | |
944 | } | |
945 | ||
946 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 947 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 948 | rc = -EAGAIN; |
79a58d1f | 949 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
950 | } else { |
951 | rc = -EIO; | |
952 | } | |
953 | } | |
954 | spin_unlock(&GlobalMid_Lock); | |
955 | DeleteMidQEntry(midQ); | |
956 | return rc; | |
1da177e4 | 957 | } |
50c2f753 | 958 | |
7ee1af76 JA |
959 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
960 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
961 | receive_len, xid)); | |
962 | rc = -EIO; | |
17c8bfed VL |
963 | goto out; |
964 | } | |
7ee1af76 | 965 | |
17c8bfed | 966 | /* rcvd frame is ok */ |
7ee1af76 | 967 | |
ac6a3ef4 | 968 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 VL |
969 | rc = -EIO; |
970 | cERROR(1, ("Bad MID state?")); | |
971 | goto out; | |
972 | } | |
1da177e4 | 973 | |
698e96a8 VL |
974 | out_buf->smb_buf_length = receive_len; |
975 | memcpy((char *)out_buf + 4, | |
976 | (char *)midQ->resp_buf + 4, | |
977 | receive_len); | |
978 | ||
979 | dump_smb(out_buf, 92); | |
980 | /* convert the length into a more usable form */ | |
981 | if ((receive_len > 24) && | |
982 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
983 | SECMODE_SIGN_ENABLED))) { | |
984 | rc = cifs_verify_signature(out_buf, | |
985 | &ses->server->mac_signing_key, | |
986 | midQ->sequence_number+1); | |
987 | if (rc) { | |
988 | cERROR(1, ("Unexpected SMB signature")); | |
989 | /* BB FIXME add code to kill session */ | |
7ee1af76 | 990 | } |
698e96a8 | 991 | } |
17c8bfed | 992 | |
698e96a8 | 993 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 994 | |
698e96a8 VL |
995 | /* BB special case reconnect tid and uid here? */ |
996 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 997 | |
698e96a8 VL |
998 | /* convert ByteCount if necessary */ |
999 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
1000 | /* do not count RFC1001 header */ + | |
1001 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
1002 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
1003 | |
1004 | out: | |
7ee1af76 JA |
1005 | DeleteMidQEntry(midQ); |
1006 | if (rstart && rc == -EACCES) | |
1007 | return -ERESTARTSYS; | |
1da177e4 LT |
1008 | return rc; |
1009 | } |