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> | |
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 | ||
1da177e4 LT |
64 | atomic_inc(&midCount); |
65 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
66 | return temp; |
67 | } | |
68 | ||
69 | static void | |
70 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
71 | { | |
1047abc1 SF |
72 | #ifdef CONFIG_CIFS_STATS2 |
73 | unsigned long now; | |
74 | #endif | |
1da177e4 | 75 | midEntry->midState = MID_FREE; |
8097531a | 76 | atomic_dec(&midCount); |
79a58d1f | 77 | if (midEntry->largeBuf) |
b8643e1b SF |
78 | cifs_buf_release(midEntry->resp_buf); |
79 | else | |
80 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
81 | #ifdef CONFIG_CIFS_STATS2 |
82 | now = jiffies; | |
83 | /* commands taking longer than one second are indications that | |
84 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
85 | if ((now - midEntry->when_alloc) > HZ) { |
86 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
87 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
88 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
89 | midEntry->command, midEntry->mid); | |
90 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
91 | now - midEntry->when_alloc, | |
92 | now - midEntry->when_sent, | |
93 | now - midEntry->when_received); | |
94 | } | |
95 | } | |
96 | #endif | |
1da177e4 LT |
97 | mempool_free(midEntry, cifs_mid_poolp); |
98 | } | |
99 | ||
ddc8cf8f JL |
100 | static void |
101 | delete_mid(struct mid_q_entry *mid) | |
102 | { | |
103 | spin_lock(&GlobalMid_Lock); | |
104 | list_del(&mid->qhead); | |
105 | spin_unlock(&GlobalMid_Lock); | |
106 | ||
107 | DeleteMidQEntry(mid); | |
108 | } | |
109 | ||
d6e04ae6 | 110 | static int |
0496e02d | 111 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
112 | { |
113 | int rc = 0; | |
114 | int i = 0; | |
115 | struct msghdr smb_msg; | |
3e84469d SF |
116 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
117 | unsigned int len = iov[0].iov_len; | |
118 | unsigned int total_len; | |
119 | int first_vec = 0; | |
7ee1af76 | 120 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 121 | struct socket *ssocket = server->ssocket; |
50c2f753 | 122 | |
79a58d1f | 123 | if (ssocket == NULL) |
1da177e4 | 124 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 125 | |
a9f1b85e | 126 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 127 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
128 | smb_msg.msg_control = NULL; |
129 | smb_msg.msg_controllen = 0; | |
0496e02d | 130 | if (server->noblocksnd) |
edf1ae40 SF |
131 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
132 | else | |
133 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
134 | |
135 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
136 | area, and byte area if necessary, is converted to littleendian in |
137 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
138 | Flags2 is converted in SendReceive */ |
139 | ||
3e84469d SF |
140 | |
141 | total_len = 0; | |
142 | for (i = 0; i < n_vec; i++) | |
143 | total_len += iov[i].iov_len; | |
144 | ||
1da177e4 | 145 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
b6b38f70 | 146 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
147 | dump_smb(smb_buffer, len); |
148 | ||
17680356 | 149 | i = 0; |
3e84469d SF |
150 | while (total_len) { |
151 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
152 | n_vec - first_vec, total_len); | |
1da177e4 LT |
153 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
154 | i++; | |
da505c38 SF |
155 | /* if blocking send we try 3 times, since each can block |
156 | for 5 seconds. For nonblocking we have to try more | |
157 | but wait increasing amounts of time allowing time for | |
158 | socket to clear. The overall time we wait in either | |
159 | case to send on the socket is about 15 seconds. | |
160 | Similarly we wait for 15 seconds for | |
161 | a response from the server in SendReceive[2] | |
162 | for the server to send a response back for | |
163 | most types of requests (except SMB Write | |
164 | past end of file which can be slow, and | |
165 | blocking lock operations). NFS waits slightly longer | |
166 | than CIFS, but this can make it take longer for | |
167 | nonresponsive servers to be detected and 15 seconds | |
168 | is more than enough time for modern networks to | |
169 | send a packet. In most cases if we fail to send | |
170 | after the retries we will kill the socket and | |
171 | reconnect which may clear the network problem. | |
172 | */ | |
173 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
174 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
175 | ssocket); | |
1da177e4 LT |
176 | rc = -EAGAIN; |
177 | break; | |
178 | } | |
68058e75 | 179 | msleep(1 << i); |
1da177e4 LT |
180 | continue; |
181 | } | |
79a58d1f | 182 | if (rc < 0) |
1da177e4 | 183 | break; |
3e84469d | 184 | |
61de800d SF |
185 | if (rc == total_len) { |
186 | total_len = 0; | |
187 | break; | |
188 | } else if (rc > total_len) { | |
b6b38f70 | 189 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
190 | break; |
191 | } | |
79a58d1f | 192 | if (rc == 0) { |
3e84469d SF |
193 | /* should never happen, letting socket clear before |
194 | retrying is our only obvious option here */ | |
b6b38f70 | 195 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
196 | msleep(500); |
197 | continue; | |
d6e04ae6 | 198 | } |
3e84469d | 199 | total_len -= rc; |
68058e75 | 200 | /* the line below resets i */ |
3e84469d SF |
201 | for (i = first_vec; i < n_vec; i++) { |
202 | if (iov[i].iov_len) { | |
203 | if (rc > iov[i].iov_len) { | |
204 | rc -= iov[i].iov_len; | |
205 | iov[i].iov_len = 0; | |
206 | } else { | |
207 | iov[i].iov_base += rc; | |
208 | iov[i].iov_len -= rc; | |
209 | first_vec = i; | |
210 | break; | |
211 | } | |
212 | } | |
d6e04ae6 | 213 | } |
5e1253b5 | 214 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
215 | } |
216 | ||
edf1ae40 | 217 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
218 | cFYI(1, "partial send (%d remaining), terminating session", |
219 | total_len); | |
edf1ae40 SF |
220 | /* If we have only sent part of an SMB then the next SMB |
221 | could be taken as the remainder of this one. We need | |
222 | to kill the socket so the server throws away the partial | |
223 | SMB */ | |
224 | server->tcpStatus = CifsNeedReconnect; | |
225 | } | |
226 | ||
1da177e4 | 227 | if (rc < 0) { |
b6b38f70 | 228 | cERROR(1, "Error %d sending data on socket to server", rc); |
3e84469d | 229 | } else |
1da177e4 | 230 | rc = 0; |
1da177e4 | 231 | |
7ee1af76 JA |
232 | /* Don't want to modify the buffer as a |
233 | side effect of this call. */ | |
234 | smb_buffer->smb_buf_length = smb_buf_length; | |
235 | ||
1da177e4 LT |
236 | return rc; |
237 | } | |
238 | ||
0496e02d JL |
239 | int |
240 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
241 | unsigned int smb_buf_length) | |
242 | { | |
243 | struct kvec iov; | |
244 | ||
245 | iov.iov_base = smb_buffer; | |
246 | iov.iov_len = smb_buf_length + 4; | |
247 | ||
248 | return smb_sendv(server, &iov, 1); | |
249 | } | |
250 | ||
c5797a94 JL |
251 | static int wait_for_free_request(struct TCP_Server_Info *server, |
252 | const int long_op) | |
1da177e4 | 253 | { |
133672ef | 254 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 255 | /* oplock breaks must not be held up */ |
c5797a94 | 256 | atomic_inc(&server->inFlight); |
27a97a61 VL |
257 | return 0; |
258 | } | |
259 | ||
260 | spin_lock(&GlobalMid_Lock); | |
261 | while (1) { | |
c5797a94 | 262 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
27a97a61 | 263 | spin_unlock(&GlobalMid_Lock); |
131afd0b | 264 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 265 | atomic_inc(&server->num_waiters); |
131afd0b | 266 | #endif |
c5797a94 JL |
267 | wait_event(server->request_q, |
268 | atomic_read(&server->inFlight) | |
27a97a61 | 269 | < cifs_max_pending); |
131afd0b | 270 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 271 | atomic_dec(&server->num_waiters); |
131afd0b | 272 | #endif |
27a97a61 VL |
273 | spin_lock(&GlobalMid_Lock); |
274 | } else { | |
c5797a94 | 275 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 276 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 277 | return -ENOENT; |
1da177e4 | 278 | } |
27a97a61 VL |
279 | |
280 | /* can not count locking commands against total | |
281 | as they are allowed to block on server */ | |
282 | ||
283 | /* update # of requests on the wire to server */ | |
284 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 285 | atomic_inc(&server->inFlight); |
27a97a61 VL |
286 | spin_unlock(&GlobalMid_Lock); |
287 | break; | |
1da177e4 LT |
288 | } |
289 | } | |
7ee1af76 JA |
290 | return 0; |
291 | } | |
1da177e4 | 292 | |
7ee1af76 JA |
293 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
294 | struct mid_q_entry **ppmidQ) | |
295 | { | |
1da177e4 | 296 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 297 | return -ENOENT; |
8fbbd365 VL |
298 | } |
299 | ||
300 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 301 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 302 | return -EAGAIN; |
8fbbd365 VL |
303 | } |
304 | ||
305 | if (ses->status != CifsGood) { | |
1da177e4 | 306 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 307 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 308 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 309 | return -EAGAIN; |
ad7a2926 | 310 | /* else ok - we are setting up session */ |
1da177e4 | 311 | } |
24b9b06b | 312 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 313 | if (*ppmidQ == NULL) |
7ee1af76 | 314 | return -ENOMEM; |
ddc8cf8f JL |
315 | spin_lock(&GlobalMid_Lock); |
316 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
317 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
318 | return 0; |
319 | } | |
320 | ||
79a58d1f | 321 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
322 | struct mid_q_entry *midQ, |
323 | unsigned long timeout, | |
324 | unsigned long time_to_wait) | |
325 | { | |
326 | unsigned long curr_timeout; | |
327 | ||
328 | for (;;) { | |
329 | curr_timeout = timeout + jiffies; | |
85705524 JL |
330 | wait_event_timeout(ses->server->response_q, |
331 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
332 | |
333 | if (time_after(jiffies, curr_timeout) && | |
334 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
335 | ((ses->server->tcpStatus == CifsGood) || | |
336 | (ses->server->tcpStatus == CifsNew))) { | |
337 | ||
338 | unsigned long lrt; | |
339 | ||
340 | /* We timed out. Is the server still | |
341 | sending replies ? */ | |
342 | spin_lock(&GlobalMid_Lock); | |
343 | lrt = ses->server->lstrp; | |
344 | spin_unlock(&GlobalMid_Lock); | |
345 | ||
346 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 347 | Although we prefer not to time out if the |
7ee1af76 | 348 | server is still responding - we will time |
79a58d1f | 349 | out if the server takes more than 15 (or 45 |
7ee1af76 | 350 | or 180) seconds to respond to this request |
79a58d1f | 351 | and has not responded to any request from |
7ee1af76 JA |
352 | other threads on the client within 10 seconds */ |
353 | lrt += time_to_wait; | |
354 | if (time_after(jiffies, lrt)) { | |
355 | /* No replies for time_to_wait. */ | |
b6b38f70 | 356 | cERROR(1, "server not responding"); |
7ee1af76 JA |
357 | return -1; |
358 | } | |
359 | } else { | |
360 | return 0; | |
361 | } | |
362 | } | |
363 | } | |
364 | ||
133672ef SF |
365 | |
366 | /* | |
367 | * | |
368 | * Send an SMB Request. No response info (other than return code) | |
369 | * needs to be parsed. | |
370 | * | |
371 | * flags indicate the type of request buffer and how long to wait | |
372 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
373 | * | |
374 | */ | |
375 | int | |
376 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
377 | struct smb_hdr *in_buf, int flags) | |
378 | { | |
379 | int rc; | |
380 | struct kvec iov[1]; | |
381 | int resp_buf_type; | |
382 | ||
383 | iov[0].iov_base = (char *)in_buf; | |
384 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
385 | flags |= CIFS_NO_RESP; | |
386 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 387 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 388 | |
133672ef SF |
389 | return rc; |
390 | } | |
391 | ||
7ee1af76 | 392 | int |
79a58d1f SF |
393 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
394 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 395 | const int flags) |
7ee1af76 JA |
396 | { |
397 | int rc = 0; | |
133672ef | 398 | int long_op; |
7ee1af76 JA |
399 | unsigned int receive_len; |
400 | unsigned long timeout; | |
401 | struct mid_q_entry *midQ; | |
402 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 403 | |
133672ef SF |
404 | long_op = flags & CIFS_TIMEOUT_MASK; |
405 | ||
7ee1af76 JA |
406 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
407 | ||
408 | if ((ses == NULL) || (ses->server == NULL)) { | |
409 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 410 | cERROR(1, "Null session"); |
7ee1af76 JA |
411 | return -EIO; |
412 | } | |
413 | ||
79a58d1f | 414 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
415 | cifs_small_buf_release(in_buf); |
416 | return -ENOENT; | |
417 | } | |
418 | ||
79a58d1f | 419 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
420 | to the same server. We may make this configurable later or |
421 | use ses->maxReq */ | |
422 | ||
c5797a94 | 423 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
424 | if (rc) { |
425 | cifs_small_buf_release(in_buf); | |
426 | return rc; | |
427 | } | |
428 | ||
79a58d1f | 429 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
430 | and avoid races inside tcp sendmsg code that could cause corruption |
431 | of smb data */ | |
432 | ||
72ca545b | 433 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
434 | |
435 | rc = allocate_mid(ses, in_buf, &midQ); | |
436 | if (rc) { | |
72ca545b | 437 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 438 | cifs_small_buf_release(in_buf); |
7ee1af76 | 439 | /* Update # of requests on wire to server */ |
79a58d1f | 440 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
441 | wake_up(&ses->server->request_q); |
442 | return rc; | |
1da177e4 | 443 | } |
79a58d1f | 444 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
445 | if (rc) { |
446 | mutex_unlock(&ses->server->srv_mutex); | |
447 | cifs_small_buf_release(in_buf); | |
448 | goto out; | |
449 | } | |
1da177e4 LT |
450 | |
451 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
452 | #ifdef CONFIG_CIFS_STATS2 |
453 | atomic_inc(&ses->server->inSend); | |
454 | #endif | |
0496e02d | 455 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
456 | #ifdef CONFIG_CIFS_STATS2 |
457 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 458 | midQ->when_sent = jiffies; |
131afd0b | 459 | #endif |
7ee1af76 | 460 | |
72ca545b | 461 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
462 | cifs_small_buf_release(in_buf); |
463 | ||
79a58d1f | 464 | if (rc < 0) |
7ee1af76 | 465 | goto out; |
4b8f930f | 466 | |
133672ef SF |
467 | if (long_op == CIFS_STD_OP) |
468 | timeout = 15 * HZ; | |
469 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 470 | timeout = 180 * HZ; |
133672ef | 471 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 472 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 473 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
474 | else if (long_op == CIFS_ASYNC_OP) |
475 | goto out; | |
476 | else if (long_op == CIFS_BLOCKING_OP) | |
477 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
478 | else { | |
b6b38f70 | 479 | cERROR(1, "unknown timeout flag %d", long_op); |
133672ef SF |
480 | rc = -EIO; |
481 | goto out; | |
482 | } | |
7ee1af76 | 483 | |
79a58d1f | 484 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
485 | due to last connection to this server being unmounted */ |
486 | if (signal_pending(current)) { | |
487 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 488 | but we still give response a chance to complete */ |
d6e04ae6 | 489 | timeout = 2 * HZ; |
79a58d1f | 490 | } |
d6e04ae6 SF |
491 | |
492 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 493 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
494 | |
495 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a VL |
496 | |
497 | if (midQ->resp_buf == NULL) { | |
b6b38f70 JP |
498 | cERROR(1, "No response to cmd %d mid %d", |
499 | midQ->command, midQ->mid); | |
79a58d1f SF |
500 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
501 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
502 | rc = -EHOSTDOWN; |
503 | else { | |
504 | ses->server->tcpStatus = CifsNeedReconnect; | |
505 | midQ->midState = MID_RETRY_NEEDED; | |
506 | } | |
507 | } | |
508 | ||
509 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 510 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 511 | rc = -EAGAIN; |
b6b38f70 | 512 | cFYI(1, "marking request for retry"); |
d6e04ae6 SF |
513 | } else { |
514 | rc = -EIO; | |
515 | } | |
516 | } | |
517 | spin_unlock(&GlobalMid_Lock); | |
ddc8cf8f | 518 | delete_mid(midQ); |
7ee1af76 | 519 | /* Update # of requests on wire to server */ |
79a58d1f | 520 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 521 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
522 | return rc; |
523 | } | |
50c2f753 | 524 | |
8e4f2e8a VL |
525 | spin_unlock(&GlobalMid_Lock); |
526 | receive_len = midQ->resp_buf->smb_buf_length; | |
527 | ||
d6e04ae6 | 528 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
529 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
530 | receive_len, xid); | |
d6e04ae6 | 531 | rc = -EIO; |
2b2bdfba SF |
532 | goto out; |
533 | } | |
534 | ||
535 | /* rcvd frame is ok */ | |
536 | ||
537 | if (midQ->resp_buf && | |
538 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
539 | ||
540 | iov[0].iov_base = (char *)midQ->resp_buf; | |
541 | if (midQ->largeBuf) | |
542 | *pRespBufType = CIFS_LARGE_BUFFER; | |
543 | else | |
544 | *pRespBufType = CIFS_SMALL_BUFFER; | |
545 | iov[0].iov_len = receive_len + 4; | |
546 | ||
547 | dump_smb(midQ->resp_buf, 80); | |
548 | /* convert the length into a more usable form */ | |
549 | if ((receive_len > 24) && | |
550 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
551 | SECMODE_SIGN_ENABLED))) { | |
552 | rc = cifs_verify_signature(midQ->resp_buf, | |
21e73393 | 553 | ses->server, |
d6e04ae6 | 554 | midQ->sequence_number+1); |
2b2bdfba | 555 | if (rc) { |
b6b38f70 | 556 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 557 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 558 | } |
d6e04ae6 | 559 | } |
2b2bdfba SF |
560 | |
561 | /* BB special case reconnect tid and uid here? */ | |
562 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
563 | flags & CIFS_LOG_ERROR); | |
564 | ||
565 | /* convert ByteCount if necessary */ | |
566 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
567 | /* do not count RFC1001 header */ + | |
568 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
569 | BCC(midQ->resp_buf) = | |
570 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
571 | if ((flags & CIFS_NO_RESP) == 0) | |
572 | midQ->resp_buf = NULL; /* mark it so buf will | |
573 | not be freed by | |
ddc8cf8f | 574 | delete_mid */ |
2b2bdfba SF |
575 | } else { |
576 | rc = -EIO; | |
b6b38f70 | 577 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 578 | } |
1da177e4 | 579 | |
7ee1af76 | 580 | out: |
ddc8cf8f | 581 | delete_mid(midQ); |
79a58d1f | 582 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 583 | wake_up(&ses->server->request_q); |
1da177e4 | 584 | |
d6e04ae6 SF |
585 | return rc; |
586 | } | |
1da177e4 LT |
587 | |
588 | int | |
589 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
590 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
591 | int *pbytes_returned, const int long_op) | |
592 | { | |
593 | int rc = 0; | |
594 | unsigned int receive_len; | |
595 | unsigned long timeout; | |
596 | struct mid_q_entry *midQ; | |
597 | ||
598 | if (ses == NULL) { | |
b6b38f70 | 599 | cERROR(1, "Null smb session"); |
1da177e4 LT |
600 | return -EIO; |
601 | } | |
79a58d1f | 602 | if (ses->server == NULL) { |
b6b38f70 | 603 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
604 | return -EIO; |
605 | } | |
606 | ||
79a58d1f | 607 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
608 | return -ENOENT; |
609 | ||
79a58d1f | 610 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
611 | to the same server. We may make this configurable later or |
612 | use ses->maxReq */ | |
1da177e4 | 613 | |
6d9c6d54 | 614 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
615 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
616 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
617 | return -EIO; |
618 | } | |
619 | ||
c5797a94 | 620 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
621 | if (rc) |
622 | return rc; | |
623 | ||
79a58d1f | 624 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
625 | and avoid races inside tcp sendmsg code that could cause corruption |
626 | of smb data */ | |
627 | ||
72ca545b | 628 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 629 | |
7ee1af76 JA |
630 | rc = allocate_mid(ses, in_buf, &midQ); |
631 | if (rc) { | |
72ca545b | 632 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 633 | /* Update # of requests on wire to server */ |
79a58d1f | 634 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
635 | wake_up(&ses->server->request_q); |
636 | return rc; | |
1da177e4 LT |
637 | } |
638 | ||
ad009ac9 | 639 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
640 | if (rc) { |
641 | mutex_unlock(&ses->server->srv_mutex); | |
642 | goto out; | |
643 | } | |
1da177e4 LT |
644 | |
645 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
646 | #ifdef CONFIG_CIFS_STATS2 |
647 | atomic_inc(&ses->server->inSend); | |
648 | #endif | |
0496e02d | 649 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
650 | #ifdef CONFIG_CIFS_STATS2 |
651 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 652 | midQ->when_sent = jiffies; |
131afd0b | 653 | #endif |
72ca545b | 654 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 655 | |
79a58d1f | 656 | if (rc < 0) |
7ee1af76 JA |
657 | goto out; |
658 | ||
133672ef SF |
659 | if (long_op == CIFS_STD_OP) |
660 | timeout = 15 * HZ; | |
661 | /* wait for 15 seconds or until woken up due to response arriving or | |
662 | due to last connection to this server being unmounted */ | |
663 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 664 | goto out; |
133672ef | 665 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 666 | timeout = 180 * HZ; |
133672ef | 667 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 668 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 669 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
670 | else if (long_op == CIFS_BLOCKING_OP) |
671 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
672 | else { | |
b6b38f70 | 673 | cERROR(1, "unknown timeout flag %d", long_op); |
133672ef SF |
674 | rc = -EIO; |
675 | goto out; | |
676 | } | |
677 | ||
1da177e4 LT |
678 | if (signal_pending(current)) { |
679 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 680 | but we still give response a chance to complete */ |
1da177e4 | 681 | timeout = 2 * HZ; |
79a58d1f | 682 | } |
1da177e4 LT |
683 | |
684 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 685 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
686 | |
687 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a | 688 | if (midQ->resp_buf == NULL) { |
b6b38f70 JP |
689 | cERROR(1, "No response for cmd %d mid %d", |
690 | midQ->command, midQ->mid); | |
79a58d1f SF |
691 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
692 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
693 | rc = -EHOSTDOWN; |
694 | else { | |
695 | ses->server->tcpStatus = CifsNeedReconnect; | |
696 | midQ->midState = MID_RETRY_NEEDED; | |
697 | } | |
698 | } | |
699 | ||
700 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 701 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 702 | rc = -EAGAIN; |
b6b38f70 | 703 | cFYI(1, "marking request for retry"); |
1da177e4 LT |
704 | } else { |
705 | rc = -EIO; | |
706 | } | |
707 | } | |
708 | spin_unlock(&GlobalMid_Lock); | |
ddc8cf8f | 709 | delete_mid(midQ); |
7ee1af76 | 710 | /* Update # of requests on wire to server */ |
79a58d1f | 711 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 712 | wake_up(&ses->server->request_q); |
1da177e4 LT |
713 | return rc; |
714 | } | |
50c2f753 | 715 | |
8e4f2e8a VL |
716 | spin_unlock(&GlobalMid_Lock); |
717 | receive_len = midQ->resp_buf->smb_buf_length; | |
718 | ||
1da177e4 | 719 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
720 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
721 | receive_len, xid); | |
1da177e4 | 722 | rc = -EIO; |
2b2bdfba SF |
723 | goto out; |
724 | } | |
725 | ||
726 | /* rcvd frame is ok */ | |
727 | ||
728 | if (midQ->resp_buf && out_buf | |
729 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
730 | out_buf->smb_buf_length = receive_len; | |
731 | memcpy((char *)out_buf + 4, | |
732 | (char *)midQ->resp_buf + 4, | |
733 | receive_len); | |
734 | ||
735 | dump_smb(out_buf, 92); | |
736 | /* convert the length into a more usable form */ | |
737 | if ((receive_len > 24) && | |
738 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
739 | SECMODE_SIGN_ENABLED))) { | |
740 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 741 | ses->server, |
ad009ac9 | 742 | midQ->sequence_number+1); |
2b2bdfba | 743 | if (rc) { |
b6b38f70 | 744 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 745 | /* BB FIXME add code to kill session */ |
1da177e4 | 746 | } |
2b2bdfba | 747 | } |
1da177e4 | 748 | |
2b2bdfba | 749 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 750 | |
2b2bdfba SF |
751 | /* BB special case reconnect tid and uid here? */ |
752 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 753 | |
2b2bdfba SF |
754 | /* convert ByteCount if necessary */ |
755 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
756 | /* do not count RFC1001 header */ + | |
757 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
758 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
759 | } else { | |
760 | rc = -EIO; | |
b6b38f70 | 761 | cERROR(1, "Bad MID state?"); |
1da177e4 | 762 | } |
7ee1af76 JA |
763 | |
764 | out: | |
ddc8cf8f | 765 | delete_mid(midQ); |
79a58d1f | 766 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 767 | wake_up(&ses->server->request_q); |
1da177e4 | 768 | |
7ee1af76 JA |
769 | return rc; |
770 | } | |
1da177e4 | 771 | |
7ee1af76 JA |
772 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
773 | ||
774 | static int | |
775 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
776 | struct mid_q_entry *midQ) | |
777 | { | |
778 | int rc = 0; | |
779 | struct cifsSesInfo *ses = tcon->ses; | |
780 | __u16 mid = in_buf->Mid; | |
781 | ||
782 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
783 | in_buf->Mid = mid; | |
72ca545b | 784 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
785 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
786 | if (rc) { | |
72ca545b | 787 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
788 | return rc; |
789 | } | |
0496e02d | 790 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 791 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 792 | return rc; |
7ee1af76 JA |
793 | } |
794 | ||
795 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
796 | blocking lock to return. */ | |
797 | ||
798 | static int | |
799 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
800 | struct smb_hdr *in_buf, | |
801 | struct smb_hdr *out_buf) | |
802 | { | |
803 | int bytes_returned; | |
804 | struct cifsSesInfo *ses = tcon->ses; | |
805 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
806 | ||
807 | /* We just modify the current in_buf to change | |
808 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
809 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
810 | LOCKING_ANDX_CANCEL_LOCK. */ | |
811 | ||
812 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
813 | pSMB->Timeout = 0; | |
814 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
815 | ||
816 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 817 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
818 | } |
819 | ||
820 | int | |
821 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
822 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
823 | int *pbytes_returned) | |
824 | { | |
825 | int rc = 0; | |
826 | int rstart = 0; | |
827 | unsigned int receive_len; | |
828 | struct mid_q_entry *midQ; | |
829 | struct cifsSesInfo *ses; | |
830 | ||
831 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 832 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
833 | return -EIO; |
834 | } | |
835 | ses = tcon->ses; | |
836 | ||
79a58d1f | 837 | if (ses->server == NULL) { |
b6b38f70 | 838 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
839 | return -EIO; |
840 | } | |
841 | ||
79a58d1f | 842 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
843 | return -ENOENT; |
844 | ||
79a58d1f | 845 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
846 | to the same server. We may make this configurable later or |
847 | use ses->maxReq */ | |
848 | ||
6d9c6d54 | 849 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
850 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
851 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
852 | return -EIO; |
853 | } | |
854 | ||
c5797a94 | 855 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
856 | if (rc) |
857 | return rc; | |
858 | ||
79a58d1f | 859 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
860 | and avoid races inside tcp sendmsg code that could cause corruption |
861 | of smb data */ | |
862 | ||
72ca545b | 863 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
864 | |
865 | rc = allocate_mid(ses, in_buf, &midQ); | |
866 | if (rc) { | |
72ca545b | 867 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
868 | return rc; |
869 | } | |
870 | ||
7ee1af76 | 871 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 872 | if (rc) { |
ddc8cf8f | 873 | delete_mid(midQ); |
829049cb VL |
874 | mutex_unlock(&ses->server->srv_mutex); |
875 | return rc; | |
876 | } | |
1da177e4 | 877 | |
7ee1af76 JA |
878 | midQ->midState = MID_REQUEST_SUBMITTED; |
879 | #ifdef CONFIG_CIFS_STATS2 | |
880 | atomic_inc(&ses->server->inSend); | |
881 | #endif | |
0496e02d | 882 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
883 | #ifdef CONFIG_CIFS_STATS2 |
884 | atomic_dec(&ses->server->inSend); | |
885 | midQ->when_sent = jiffies; | |
886 | #endif | |
72ca545b | 887 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 888 | |
79a58d1f | 889 | if (rc < 0) { |
ddc8cf8f | 890 | delete_mid(midQ); |
7ee1af76 JA |
891 | return rc; |
892 | } | |
893 | ||
894 | /* Wait for a reply - allow signals to interrupt. */ | |
895 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 896 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
897 | ((ses->server->tcpStatus != CifsGood) && |
898 | (ses->server->tcpStatus != CifsNew))); | |
899 | ||
900 | /* Were we interrupted by a signal ? */ | |
901 | if ((rc == -ERESTARTSYS) && | |
902 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
903 | ((ses->server->tcpStatus == CifsGood) || | |
904 | (ses->server->tcpStatus == CifsNew))) { | |
905 | ||
906 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
907 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
908 | blocking lock to return. */ | |
909 | ||
910 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
911 | if (rc) { | |
ddc8cf8f | 912 | delete_mid(midQ); |
7ee1af76 JA |
913 | return rc; |
914 | } | |
915 | } else { | |
916 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
917 | to cause the blocking lock to return. */ | |
918 | ||
919 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
920 | ||
921 | /* If we get -ENOLCK back the lock may have | |
922 | already been removed. Don't exit in this case. */ | |
923 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 924 | delete_mid(midQ); |
7ee1af76 JA |
925 | return rc; |
926 | } | |
927 | } | |
928 | ||
929 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 930 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
931 | /* We got the response - restart system call. */ |
932 | rstart = 1; | |
933 | } | |
934 | } | |
935 | ||
936 | spin_lock(&GlobalMid_Lock); | |
937 | if (midQ->resp_buf) { | |
938 | spin_unlock(&GlobalMid_Lock); | |
939 | receive_len = midQ->resp_buf->smb_buf_length; | |
940 | } else { | |
b6b38f70 JP |
941 | cERROR(1, "No response for cmd %d mid %d", |
942 | midQ->command, midQ->mid); | |
79a58d1f SF |
943 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
944 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
945 | rc = -EHOSTDOWN; |
946 | else { | |
947 | ses->server->tcpStatus = CifsNeedReconnect; | |
948 | midQ->midState = MID_RETRY_NEEDED; | |
949 | } | |
950 | } | |
951 | ||
952 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 953 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 954 | rc = -EAGAIN; |
b6b38f70 | 955 | cFYI(1, "marking request for retry"); |
7ee1af76 JA |
956 | } else { |
957 | rc = -EIO; | |
958 | } | |
959 | } | |
960 | spin_unlock(&GlobalMid_Lock); | |
ddc8cf8f | 961 | delete_mid(midQ); |
7ee1af76 | 962 | return rc; |
1da177e4 | 963 | } |
50c2f753 | 964 | |
7ee1af76 | 965 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
966 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
967 | receive_len, xid); | |
7ee1af76 | 968 | rc = -EIO; |
17c8bfed VL |
969 | goto out; |
970 | } | |
7ee1af76 | 971 | |
17c8bfed | 972 | /* rcvd frame is ok */ |
7ee1af76 | 973 | |
ac6a3ef4 | 974 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 975 | rc = -EIO; |
b6b38f70 | 976 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
977 | goto out; |
978 | } | |
1da177e4 | 979 | |
698e96a8 VL |
980 | out_buf->smb_buf_length = receive_len; |
981 | memcpy((char *)out_buf + 4, | |
982 | (char *)midQ->resp_buf + 4, | |
983 | receive_len); | |
984 | ||
985 | dump_smb(out_buf, 92); | |
986 | /* convert the length into a more usable form */ | |
987 | if ((receive_len > 24) && | |
988 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
989 | SECMODE_SIGN_ENABLED))) { | |
990 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 991 | ses->server, |
698e96a8 VL |
992 | midQ->sequence_number+1); |
993 | if (rc) { | |
b6b38f70 | 994 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 995 | /* BB FIXME add code to kill session */ |
7ee1af76 | 996 | } |
698e96a8 | 997 | } |
17c8bfed | 998 | |
698e96a8 | 999 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 1000 | |
698e96a8 VL |
1001 | /* BB special case reconnect tid and uid here? */ |
1002 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 1003 | |
698e96a8 VL |
1004 | /* convert ByteCount if necessary */ |
1005 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
1006 | /* do not count RFC1001 header */ + | |
1007 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
1008 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
1009 | |
1010 | out: | |
ddc8cf8f | 1011 | delete_mid(midQ); |
7ee1af76 JA |
1012 | if (rstart && rc == -EACCES) |
1013 | return -ERESTARTSYS; | |
1da177e4 LT |
1014 | return rc; |
1015 | } |