]>
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> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/processor.h> | |
31 | #include <linux/mempool.h> | |
32 | #include "cifspdu.h" | |
33 | #include "cifsglob.h" | |
34 | #include "cifsproto.h" | |
35 | #include "cifs_debug.h" | |
50c2f753 | 36 | |
1da177e4 | 37 | extern mempool_t *cifs_mid_poolp; |
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) { |
b6b38f70 | 45 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
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; | |
b6b38f70 | 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); |
b6b38f70 | 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))) { | |
b6b38f70 JP |
170 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
171 | ssocket); | |
1da177e4 LT |
172 | rc = -EAGAIN; |
173 | break; | |
174 | } | |
68058e75 | 175 | msleep(1 << i); |
1da177e4 LT |
176 | continue; |
177 | } | |
79a58d1f | 178 | if (rc < 0) |
1da177e4 | 179 | break; |
3e84469d | 180 | |
61de800d SF |
181 | if (rc == total_len) { |
182 | total_len = 0; | |
183 | break; | |
184 | } else if (rc > total_len) { | |
b6b38f70 | 185 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
186 | break; |
187 | } | |
79a58d1f | 188 | if (rc == 0) { |
3e84469d SF |
189 | /* should never happen, letting socket clear before |
190 | retrying is our only obvious option here */ | |
b6b38f70 | 191 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
192 | msleep(500); |
193 | continue; | |
d6e04ae6 | 194 | } |
3e84469d | 195 | total_len -= rc; |
68058e75 | 196 | /* the line below resets i */ |
3e84469d SF |
197 | for (i = first_vec; i < n_vec; i++) { |
198 | if (iov[i].iov_len) { | |
199 | if (rc > iov[i].iov_len) { | |
200 | rc -= iov[i].iov_len; | |
201 | iov[i].iov_len = 0; | |
202 | } else { | |
203 | iov[i].iov_base += rc; | |
204 | iov[i].iov_len -= rc; | |
205 | first_vec = i; | |
206 | break; | |
207 | } | |
208 | } | |
d6e04ae6 | 209 | } |
5e1253b5 | 210 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
211 | } |
212 | ||
edf1ae40 | 213 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
214 | cFYI(1, "partial send (%d remaining), terminating session", |
215 | total_len); | |
edf1ae40 SF |
216 | /* If we have only sent part of an SMB then the next SMB |
217 | could be taken as the remainder of this one. We need | |
218 | to kill the socket so the server throws away the partial | |
219 | SMB */ | |
220 | server->tcpStatus = CifsNeedReconnect; | |
221 | } | |
222 | ||
1da177e4 | 223 | if (rc < 0) { |
b6b38f70 | 224 | cERROR(1, "Error %d sending data on socket to server", rc); |
3e84469d | 225 | } else |
1da177e4 | 226 | rc = 0; |
1da177e4 | 227 | |
7ee1af76 JA |
228 | /* Don't want to modify the buffer as a |
229 | side effect of this call. */ | |
230 | smb_buffer->smb_buf_length = smb_buf_length; | |
231 | ||
1da177e4 LT |
232 | return rc; |
233 | } | |
234 | ||
0496e02d JL |
235 | int |
236 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
237 | unsigned int smb_buf_length) | |
238 | { | |
239 | struct kvec iov; | |
240 | ||
241 | iov.iov_base = smb_buffer; | |
242 | iov.iov_len = smb_buf_length + 4; | |
243 | ||
244 | return smb_sendv(server, &iov, 1); | |
245 | } | |
246 | ||
7ee1af76 | 247 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 248 | { |
133672ef | 249 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
250 | /* oplock breaks must not be held up */ |
251 | atomic_inc(&ses->server->inFlight); | |
27a97a61 VL |
252 | return 0; |
253 | } | |
254 | ||
255 | spin_lock(&GlobalMid_Lock); | |
256 | while (1) { | |
257 | if (atomic_read(&ses->server->inFlight) >= | |
258 | cifs_max_pending){ | |
259 | spin_unlock(&GlobalMid_Lock); | |
131afd0b | 260 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 261 | atomic_inc(&ses->server->num_waiters); |
131afd0b | 262 | #endif |
27a97a61 VL |
263 | wait_event(ses->server->request_q, |
264 | atomic_read(&ses->server->inFlight) | |
265 | < cifs_max_pending); | |
131afd0b | 266 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 267 | atomic_dec(&ses->server->num_waiters); |
131afd0b | 268 | #endif |
27a97a61 VL |
269 | spin_lock(&GlobalMid_Lock); |
270 | } else { | |
271 | if (ses->server->tcpStatus == CifsExiting) { | |
1da177e4 | 272 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 273 | return -ENOENT; |
1da177e4 | 274 | } |
27a97a61 VL |
275 | |
276 | /* can not count locking commands against total | |
277 | as they are allowed to block on server */ | |
278 | ||
279 | /* update # of requests on the wire to server */ | |
280 | if (long_op != CIFS_BLOCKING_OP) | |
281 | atomic_inc(&ses->server->inFlight); | |
282 | spin_unlock(&GlobalMid_Lock); | |
283 | break; | |
1da177e4 LT |
284 | } |
285 | } | |
7ee1af76 JA |
286 | return 0; |
287 | } | |
1da177e4 | 288 | |
7ee1af76 JA |
289 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
290 | struct mid_q_entry **ppmidQ) | |
291 | { | |
1da177e4 | 292 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 293 | return -ENOENT; |
8fbbd365 VL |
294 | } |
295 | ||
296 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 297 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 298 | return -EAGAIN; |
8fbbd365 VL |
299 | } |
300 | ||
301 | if (ses->status != CifsGood) { | |
1da177e4 | 302 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 303 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 304 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 305 | return -EAGAIN; |
ad7a2926 | 306 | /* else ok - we are setting up session */ |
1da177e4 | 307 | } |
24b9b06b | 308 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 309 | if (*ppmidQ == NULL) |
7ee1af76 | 310 | return -ENOMEM; |
7ee1af76 JA |
311 | return 0; |
312 | } | |
313 | ||
79a58d1f | 314 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
315 | struct mid_q_entry *midQ, |
316 | unsigned long timeout, | |
317 | unsigned long time_to_wait) | |
318 | { | |
319 | unsigned long curr_timeout; | |
320 | ||
321 | for (;;) { | |
322 | curr_timeout = timeout + jiffies; | |
85705524 JL |
323 | wait_event_timeout(ses->server->response_q, |
324 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
325 | |
326 | if (time_after(jiffies, curr_timeout) && | |
327 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
328 | ((ses->server->tcpStatus == CifsGood) || | |
329 | (ses->server->tcpStatus == CifsNew))) { | |
330 | ||
331 | unsigned long lrt; | |
332 | ||
333 | /* We timed out. Is the server still | |
334 | sending replies ? */ | |
335 | spin_lock(&GlobalMid_Lock); | |
336 | lrt = ses->server->lstrp; | |
337 | spin_unlock(&GlobalMid_Lock); | |
338 | ||
339 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 340 | Although we prefer not to time out if the |
7ee1af76 | 341 | server is still responding - we will time |
79a58d1f | 342 | out if the server takes more than 15 (or 45 |
7ee1af76 | 343 | or 180) seconds to respond to this request |
79a58d1f | 344 | and has not responded to any request from |
7ee1af76 JA |
345 | other threads on the client within 10 seconds */ |
346 | lrt += time_to_wait; | |
347 | if (time_after(jiffies, lrt)) { | |
348 | /* No replies for time_to_wait. */ | |
b6b38f70 | 349 | cERROR(1, "server not responding"); |
7ee1af76 JA |
350 | return -1; |
351 | } | |
352 | } else { | |
353 | return 0; | |
354 | } | |
355 | } | |
356 | } | |
357 | ||
133672ef SF |
358 | |
359 | /* | |
360 | * | |
361 | * Send an SMB Request. No response info (other than return code) | |
362 | * needs to be parsed. | |
363 | * | |
364 | * flags indicate the type of request buffer and how long to wait | |
365 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
366 | * | |
367 | */ | |
368 | int | |
369 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
370 | struct smb_hdr *in_buf, int flags) | |
371 | { | |
372 | int rc; | |
373 | struct kvec iov[1]; | |
374 | int resp_buf_type; | |
375 | ||
376 | iov[0].iov_base = (char *)in_buf; | |
377 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
378 | flags |= CIFS_NO_RESP; | |
379 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 380 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 381 | |
133672ef SF |
382 | return rc; |
383 | } | |
384 | ||
7ee1af76 | 385 | int |
79a58d1f SF |
386 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
387 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 388 | const int flags) |
7ee1af76 JA |
389 | { |
390 | int rc = 0; | |
133672ef | 391 | int long_op; |
7ee1af76 JA |
392 | unsigned int receive_len; |
393 | unsigned long timeout; | |
394 | struct mid_q_entry *midQ; | |
395 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 396 | |
133672ef SF |
397 | long_op = flags & CIFS_TIMEOUT_MASK; |
398 | ||
7ee1af76 JA |
399 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
400 | ||
401 | if ((ses == NULL) || (ses->server == NULL)) { | |
402 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 403 | cERROR(1, "Null session"); |
7ee1af76 JA |
404 | return -EIO; |
405 | } | |
406 | ||
79a58d1f | 407 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
408 | cifs_small_buf_release(in_buf); |
409 | return -ENOENT; | |
410 | } | |
411 | ||
79a58d1f | 412 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
413 | to the same server. We may make this configurable later or |
414 | use ses->maxReq */ | |
415 | ||
416 | rc = wait_for_free_request(ses, long_op); | |
417 | if (rc) { | |
418 | cifs_small_buf_release(in_buf); | |
419 | return rc; | |
420 | } | |
421 | ||
79a58d1f | 422 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
423 | and avoid races inside tcp sendmsg code that could cause corruption |
424 | of smb data */ | |
425 | ||
72ca545b | 426 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
427 | |
428 | rc = allocate_mid(ses, in_buf, &midQ); | |
429 | if (rc) { | |
72ca545b | 430 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 431 | cifs_small_buf_release(in_buf); |
7ee1af76 | 432 | /* Update # of requests on wire to server */ |
79a58d1f | 433 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
434 | wake_up(&ses->server->request_q); |
435 | return rc; | |
1da177e4 | 436 | } |
79a58d1f | 437 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
438 | if (rc) { |
439 | mutex_unlock(&ses->server->srv_mutex); | |
440 | cifs_small_buf_release(in_buf); | |
441 | goto out; | |
442 | } | |
1da177e4 LT |
443 | |
444 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
445 | #ifdef CONFIG_CIFS_STATS2 |
446 | atomic_inc(&ses->server->inSend); | |
447 | #endif | |
0496e02d | 448 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
449 | #ifdef CONFIG_CIFS_STATS2 |
450 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 451 | midQ->when_sent = jiffies; |
131afd0b | 452 | #endif |
7ee1af76 | 453 | |
72ca545b | 454 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
455 | cifs_small_buf_release(in_buf); |
456 | ||
79a58d1f | 457 | if (rc < 0) |
7ee1af76 | 458 | goto out; |
4b8f930f | 459 | |
133672ef SF |
460 | if (long_op == CIFS_STD_OP) |
461 | timeout = 15 * HZ; | |
462 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 463 | timeout = 180 * HZ; |
133672ef | 464 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 465 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 466 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
467 | else if (long_op == CIFS_ASYNC_OP) |
468 | goto out; | |
469 | else if (long_op == CIFS_BLOCKING_OP) | |
470 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
471 | else { | |
b6b38f70 | 472 | cERROR(1, "unknown timeout flag %d", long_op); |
133672ef SF |
473 | rc = -EIO; |
474 | goto out; | |
475 | } | |
7ee1af76 | 476 | |
79a58d1f | 477 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
478 | due to last connection to this server being unmounted */ |
479 | if (signal_pending(current)) { | |
480 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 481 | but we still give response a chance to complete */ |
d6e04ae6 | 482 | timeout = 2 * HZ; |
79a58d1f | 483 | } |
d6e04ae6 SF |
484 | |
485 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 486 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
487 | |
488 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a VL |
489 | |
490 | if (midQ->resp_buf == NULL) { | |
b6b38f70 JP |
491 | cERROR(1, "No response to cmd %d mid %d", |
492 | midQ->command, midQ->mid); | |
79a58d1f SF |
493 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
494 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
495 | rc = -EHOSTDOWN; |
496 | else { | |
497 | ses->server->tcpStatus = CifsNeedReconnect; | |
498 | midQ->midState = MID_RETRY_NEEDED; | |
499 | } | |
500 | } | |
501 | ||
502 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 503 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 504 | rc = -EAGAIN; |
b6b38f70 | 505 | cFYI(1, "marking request for retry"); |
d6e04ae6 SF |
506 | } else { |
507 | rc = -EIO; | |
508 | } | |
509 | } | |
510 | spin_unlock(&GlobalMid_Lock); | |
511 | DeleteMidQEntry(midQ); | |
7ee1af76 | 512 | /* Update # of requests on wire to server */ |
79a58d1f | 513 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 514 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
515 | return rc; |
516 | } | |
50c2f753 | 517 | |
8e4f2e8a VL |
518 | spin_unlock(&GlobalMid_Lock); |
519 | receive_len = midQ->resp_buf->smb_buf_length; | |
520 | ||
d6e04ae6 | 521 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
522 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
523 | receive_len, xid); | |
d6e04ae6 | 524 | rc = -EIO; |
2b2bdfba SF |
525 | goto out; |
526 | } | |
527 | ||
528 | /* rcvd frame is ok */ | |
529 | ||
530 | if (midQ->resp_buf && | |
531 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
532 | ||
533 | iov[0].iov_base = (char *)midQ->resp_buf; | |
534 | if (midQ->largeBuf) | |
535 | *pRespBufType = CIFS_LARGE_BUFFER; | |
536 | else | |
537 | *pRespBufType = CIFS_SMALL_BUFFER; | |
538 | iov[0].iov_len = receive_len + 4; | |
539 | ||
540 | dump_smb(midQ->resp_buf, 80); | |
541 | /* convert the length into a more usable form */ | |
542 | if ((receive_len > 24) && | |
543 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
544 | SECMODE_SIGN_ENABLED))) { | |
545 | rc = cifs_verify_signature(midQ->resp_buf, | |
5f98ca9a | 546 | &ses->server->session_key, |
d6e04ae6 | 547 | midQ->sequence_number+1); |
2b2bdfba | 548 | if (rc) { |
b6b38f70 | 549 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 550 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 551 | } |
d6e04ae6 | 552 | } |
2b2bdfba SF |
553 | |
554 | /* BB special case reconnect tid and uid here? */ | |
555 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
556 | flags & CIFS_LOG_ERROR); | |
557 | ||
558 | /* convert ByteCount if necessary */ | |
559 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
560 | /* do not count RFC1001 header */ + | |
561 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
562 | BCC(midQ->resp_buf) = | |
563 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
564 | if ((flags & CIFS_NO_RESP) == 0) | |
565 | midQ->resp_buf = NULL; /* mark it so buf will | |
566 | not be freed by | |
567 | DeleteMidQEntry */ | |
568 | } else { | |
569 | rc = -EIO; | |
b6b38f70 | 570 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 571 | } |
1da177e4 | 572 | |
7ee1af76 | 573 | out: |
7ee1af76 | 574 | DeleteMidQEntry(midQ); |
79a58d1f | 575 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 576 | wake_up(&ses->server->request_q); |
1da177e4 | 577 | |
d6e04ae6 SF |
578 | return rc; |
579 | } | |
1da177e4 LT |
580 | |
581 | int | |
582 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
583 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
584 | int *pbytes_returned, const int long_op) | |
585 | { | |
586 | int rc = 0; | |
587 | unsigned int receive_len; | |
588 | unsigned long timeout; | |
589 | struct mid_q_entry *midQ; | |
590 | ||
591 | if (ses == NULL) { | |
b6b38f70 | 592 | cERROR(1, "Null smb session"); |
1da177e4 LT |
593 | return -EIO; |
594 | } | |
79a58d1f | 595 | if (ses->server == NULL) { |
b6b38f70 | 596 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
597 | return -EIO; |
598 | } | |
599 | ||
79a58d1f | 600 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
601 | return -ENOENT; |
602 | ||
79a58d1f | 603 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
604 | to the same server. We may make this configurable later or |
605 | use ses->maxReq */ | |
1da177e4 | 606 | |
6d9c6d54 | 607 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
608 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
609 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
610 | return -EIO; |
611 | } | |
612 | ||
7ee1af76 JA |
613 | rc = wait_for_free_request(ses, long_op); |
614 | if (rc) | |
615 | return rc; | |
616 | ||
79a58d1f | 617 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
618 | and avoid races inside tcp sendmsg code that could cause corruption |
619 | of smb data */ | |
620 | ||
72ca545b | 621 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 622 | |
7ee1af76 JA |
623 | rc = allocate_mid(ses, in_buf, &midQ); |
624 | if (rc) { | |
72ca545b | 625 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 626 | /* Update # of requests on wire to server */ |
79a58d1f | 627 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
628 | wake_up(&ses->server->request_q); |
629 | return rc; | |
1da177e4 LT |
630 | } |
631 | ||
ad009ac9 | 632 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
633 | if (rc) { |
634 | mutex_unlock(&ses->server->srv_mutex); | |
635 | goto out; | |
636 | } | |
1da177e4 LT |
637 | |
638 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
639 | #ifdef CONFIG_CIFS_STATS2 |
640 | atomic_inc(&ses->server->inSend); | |
641 | #endif | |
0496e02d | 642 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
643 | #ifdef CONFIG_CIFS_STATS2 |
644 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 645 | midQ->when_sent = jiffies; |
131afd0b | 646 | #endif |
72ca545b | 647 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 648 | |
79a58d1f | 649 | if (rc < 0) |
7ee1af76 JA |
650 | goto out; |
651 | ||
133672ef SF |
652 | if (long_op == CIFS_STD_OP) |
653 | timeout = 15 * HZ; | |
654 | /* wait for 15 seconds or until woken up due to response arriving or | |
655 | due to last connection to this server being unmounted */ | |
656 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 657 | goto out; |
133672ef | 658 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 659 | timeout = 180 * HZ; |
133672ef | 660 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 661 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 662 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
663 | else if (long_op == CIFS_BLOCKING_OP) |
664 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
665 | else { | |
b6b38f70 | 666 | cERROR(1, "unknown timeout flag %d", long_op); |
133672ef SF |
667 | rc = -EIO; |
668 | goto out; | |
669 | } | |
670 | ||
1da177e4 LT |
671 | if (signal_pending(current)) { |
672 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 673 | but we still give response a chance to complete */ |
1da177e4 | 674 | timeout = 2 * HZ; |
79a58d1f | 675 | } |
1da177e4 LT |
676 | |
677 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 678 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
679 | |
680 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a | 681 | if (midQ->resp_buf == NULL) { |
b6b38f70 JP |
682 | cERROR(1, "No response for cmd %d mid %d", |
683 | midQ->command, midQ->mid); | |
79a58d1f SF |
684 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
685 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
686 | rc = -EHOSTDOWN; |
687 | else { | |
688 | ses->server->tcpStatus = CifsNeedReconnect; | |
689 | midQ->midState = MID_RETRY_NEEDED; | |
690 | } | |
691 | } | |
692 | ||
693 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 694 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 695 | rc = -EAGAIN; |
b6b38f70 | 696 | cFYI(1, "marking request for retry"); |
1da177e4 LT |
697 | } else { |
698 | rc = -EIO; | |
699 | } | |
700 | } | |
701 | spin_unlock(&GlobalMid_Lock); | |
702 | DeleteMidQEntry(midQ); | |
7ee1af76 | 703 | /* Update # of requests on wire to server */ |
79a58d1f | 704 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 705 | wake_up(&ses->server->request_q); |
1da177e4 LT |
706 | return rc; |
707 | } | |
50c2f753 | 708 | |
8e4f2e8a VL |
709 | spin_unlock(&GlobalMid_Lock); |
710 | receive_len = midQ->resp_buf->smb_buf_length; | |
711 | ||
1da177e4 | 712 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
713 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
714 | receive_len, xid); | |
1da177e4 | 715 | rc = -EIO; |
2b2bdfba SF |
716 | goto out; |
717 | } | |
718 | ||
719 | /* rcvd frame is ok */ | |
720 | ||
721 | if (midQ->resp_buf && out_buf | |
722 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
723 | out_buf->smb_buf_length = receive_len; | |
724 | memcpy((char *)out_buf + 4, | |
725 | (char *)midQ->resp_buf + 4, | |
726 | receive_len); | |
727 | ||
728 | dump_smb(out_buf, 92); | |
729 | /* convert the length into a more usable form */ | |
730 | if ((receive_len > 24) && | |
731 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
732 | SECMODE_SIGN_ENABLED))) { | |
733 | rc = cifs_verify_signature(out_buf, | |
5f98ca9a | 734 | &ses->server->session_key, |
ad009ac9 | 735 | midQ->sequence_number+1); |
2b2bdfba | 736 | if (rc) { |
b6b38f70 | 737 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 738 | /* BB FIXME add code to kill session */ |
1da177e4 | 739 | } |
2b2bdfba | 740 | } |
1da177e4 | 741 | |
2b2bdfba | 742 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 743 | |
2b2bdfba SF |
744 | /* BB special case reconnect tid and uid here? */ |
745 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 746 | |
2b2bdfba SF |
747 | /* convert ByteCount if necessary */ |
748 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
749 | /* do not count RFC1001 header */ + | |
750 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
751 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
752 | } else { | |
753 | rc = -EIO; | |
b6b38f70 | 754 | cERROR(1, "Bad MID state?"); |
1da177e4 | 755 | } |
7ee1af76 JA |
756 | |
757 | out: | |
1da177e4 | 758 | DeleteMidQEntry(midQ); |
79a58d1f | 759 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 760 | wake_up(&ses->server->request_q); |
1da177e4 | 761 | |
7ee1af76 JA |
762 | return rc; |
763 | } | |
1da177e4 | 764 | |
7ee1af76 JA |
765 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
766 | ||
767 | static int | |
768 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
769 | struct mid_q_entry *midQ) | |
770 | { | |
771 | int rc = 0; | |
772 | struct cifsSesInfo *ses = tcon->ses; | |
773 | __u16 mid = in_buf->Mid; | |
774 | ||
775 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
776 | in_buf->Mid = mid; | |
72ca545b | 777 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
778 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
779 | if (rc) { | |
72ca545b | 780 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
781 | return rc; |
782 | } | |
0496e02d | 783 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 784 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 785 | return rc; |
7ee1af76 JA |
786 | } |
787 | ||
788 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
789 | blocking lock to return. */ | |
790 | ||
791 | static int | |
792 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
793 | struct smb_hdr *in_buf, | |
794 | struct smb_hdr *out_buf) | |
795 | { | |
796 | int bytes_returned; | |
797 | struct cifsSesInfo *ses = tcon->ses; | |
798 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
799 | ||
800 | /* We just modify the current in_buf to change | |
801 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
802 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
803 | LOCKING_ANDX_CANCEL_LOCK. */ | |
804 | ||
805 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
806 | pSMB->Timeout = 0; | |
807 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
808 | ||
809 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 810 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
811 | } |
812 | ||
813 | int | |
814 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
815 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
816 | int *pbytes_returned) | |
817 | { | |
818 | int rc = 0; | |
819 | int rstart = 0; | |
820 | unsigned int receive_len; | |
821 | struct mid_q_entry *midQ; | |
822 | struct cifsSesInfo *ses; | |
823 | ||
824 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 825 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
826 | return -EIO; |
827 | } | |
828 | ses = tcon->ses; | |
829 | ||
79a58d1f | 830 | if (ses->server == NULL) { |
b6b38f70 | 831 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
832 | return -EIO; |
833 | } | |
834 | ||
79a58d1f | 835 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
836 | return -ENOENT; |
837 | ||
79a58d1f | 838 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
839 | to the same server. We may make this configurable later or |
840 | use ses->maxReq */ | |
841 | ||
6d9c6d54 | 842 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
843 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
844 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
845 | return -EIO; |
846 | } | |
847 | ||
133672ef | 848 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
849 | if (rc) |
850 | return rc; | |
851 | ||
79a58d1f | 852 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
853 | and avoid races inside tcp sendmsg code that could cause corruption |
854 | of smb data */ | |
855 | ||
72ca545b | 856 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
857 | |
858 | rc = allocate_mid(ses, in_buf, &midQ); | |
859 | if (rc) { | |
72ca545b | 860 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
861 | return rc; |
862 | } | |
863 | ||
7ee1af76 | 864 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
865 | if (rc) { |
866 | DeleteMidQEntry(midQ); | |
867 | mutex_unlock(&ses->server->srv_mutex); | |
868 | return rc; | |
869 | } | |
1da177e4 | 870 | |
7ee1af76 JA |
871 | midQ->midState = MID_REQUEST_SUBMITTED; |
872 | #ifdef CONFIG_CIFS_STATS2 | |
873 | atomic_inc(&ses->server->inSend); | |
874 | #endif | |
0496e02d | 875 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
876 | #ifdef CONFIG_CIFS_STATS2 |
877 | atomic_dec(&ses->server->inSend); | |
878 | midQ->when_sent = jiffies; | |
879 | #endif | |
72ca545b | 880 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 881 | |
79a58d1f | 882 | if (rc < 0) { |
7ee1af76 JA |
883 | DeleteMidQEntry(midQ); |
884 | return rc; | |
885 | } | |
886 | ||
887 | /* Wait for a reply - allow signals to interrupt. */ | |
888 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 889 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
890 | ((ses->server->tcpStatus != CifsGood) && |
891 | (ses->server->tcpStatus != CifsNew))); | |
892 | ||
893 | /* Were we interrupted by a signal ? */ | |
894 | if ((rc == -ERESTARTSYS) && | |
895 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
896 | ((ses->server->tcpStatus == CifsGood) || | |
897 | (ses->server->tcpStatus == CifsNew))) { | |
898 | ||
899 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
900 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
901 | blocking lock to return. */ | |
902 | ||
903 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
904 | if (rc) { | |
905 | DeleteMidQEntry(midQ); | |
906 | return rc; | |
907 | } | |
908 | } else { | |
909 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
910 | to cause the blocking lock to return. */ | |
911 | ||
912 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
913 | ||
914 | /* If we get -ENOLCK back the lock may have | |
915 | already been removed. Don't exit in this case. */ | |
916 | if (rc && rc != -ENOLCK) { | |
917 | DeleteMidQEntry(midQ); | |
918 | return rc; | |
919 | } | |
920 | } | |
921 | ||
922 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 923 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
924 | /* We got the response - restart system call. */ |
925 | rstart = 1; | |
926 | } | |
927 | } | |
928 | ||
929 | spin_lock(&GlobalMid_Lock); | |
930 | if (midQ->resp_buf) { | |
931 | spin_unlock(&GlobalMid_Lock); | |
932 | receive_len = midQ->resp_buf->smb_buf_length; | |
933 | } else { | |
b6b38f70 JP |
934 | cERROR(1, "No response for cmd %d mid %d", |
935 | midQ->command, midQ->mid); | |
79a58d1f SF |
936 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
937 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
938 | rc = -EHOSTDOWN; |
939 | else { | |
940 | ses->server->tcpStatus = CifsNeedReconnect; | |
941 | midQ->midState = MID_RETRY_NEEDED; | |
942 | } | |
943 | } | |
944 | ||
945 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 946 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 947 | rc = -EAGAIN; |
b6b38f70 | 948 | cFYI(1, "marking request for retry"); |
7ee1af76 JA |
949 | } else { |
950 | rc = -EIO; | |
951 | } | |
952 | } | |
953 | spin_unlock(&GlobalMid_Lock); | |
954 | DeleteMidQEntry(midQ); | |
955 | return rc; | |
1da177e4 | 956 | } |
50c2f753 | 957 | |
7ee1af76 | 958 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
959 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
960 | receive_len, xid); | |
7ee1af76 | 961 | rc = -EIO; |
17c8bfed VL |
962 | goto out; |
963 | } | |
7ee1af76 | 964 | |
17c8bfed | 965 | /* rcvd frame is ok */ |
7ee1af76 | 966 | |
ac6a3ef4 | 967 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 968 | rc = -EIO; |
b6b38f70 | 969 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
970 | goto out; |
971 | } | |
1da177e4 | 972 | |
698e96a8 VL |
973 | out_buf->smb_buf_length = receive_len; |
974 | memcpy((char *)out_buf + 4, | |
975 | (char *)midQ->resp_buf + 4, | |
976 | receive_len); | |
977 | ||
978 | dump_smb(out_buf, 92); | |
979 | /* convert the length into a more usable form */ | |
980 | if ((receive_len > 24) && | |
981 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
982 | SECMODE_SIGN_ENABLED))) { | |
983 | rc = cifs_verify_signature(out_buf, | |
5f98ca9a | 984 | &ses->server->session_key, |
698e96a8 VL |
985 | midQ->sequence_number+1); |
986 | if (rc) { | |
b6b38f70 | 987 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 988 | /* BB FIXME add code to kill session */ |
7ee1af76 | 989 | } |
698e96a8 | 990 | } |
17c8bfed | 991 | |
698e96a8 | 992 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 993 | |
698e96a8 VL |
994 | /* BB special case reconnect tid and uid here? */ |
995 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 996 | |
698e96a8 VL |
997 | /* convert ByteCount if necessary */ |
998 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
999 | /* do not count RFC1001 header */ + | |
1000 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
1001 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
1002 | |
1003 | out: | |
7ee1af76 JA |
1004 | DeleteMidQEntry(midQ); |
1005 | if (rstart && rc == -EACCES) | |
1006 | return -ERESTARTSYS; | |
1da177e4 LT |
1007 | return rc; |
1008 | } |