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 | ||
0ade640e JL |
321 | static int |
322 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 323 | { |
0ade640e | 324 | int error; |
7ee1af76 | 325 | |
0ade640e JL |
326 | error = wait_event_killable(server->response_q, |
327 | midQ->midState != MID_REQUEST_SUBMITTED); | |
328 | if (error < 0) | |
329 | return -ERESTARTSYS; | |
7ee1af76 | 330 | |
0ade640e | 331 | return 0; |
7ee1af76 JA |
332 | } |
333 | ||
133672ef SF |
334 | |
335 | /* | |
336 | * | |
337 | * Send an SMB Request. No response info (other than return code) | |
338 | * needs to be parsed. | |
339 | * | |
340 | * flags indicate the type of request buffer and how long to wait | |
341 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
342 | * | |
343 | */ | |
344 | int | |
345 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
346 | struct smb_hdr *in_buf, int flags) | |
347 | { | |
348 | int rc; | |
349 | struct kvec iov[1]; | |
350 | int resp_buf_type; | |
351 | ||
352 | iov[0].iov_base = (char *)in_buf; | |
353 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
354 | flags |= CIFS_NO_RESP; | |
355 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 356 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 357 | |
133672ef SF |
358 | return rc; |
359 | } | |
360 | ||
053d5034 JL |
361 | static int |
362 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) | |
363 | { | |
364 | int rc = 0; | |
365 | ||
366 | spin_lock(&GlobalMid_Lock); | |
367 | ||
368 | if (mid->resp_buf) { | |
369 | spin_unlock(&GlobalMid_Lock); | |
370 | return rc; | |
371 | } | |
372 | ||
373 | cERROR(1, "No response to cmd %d mid %d", mid->command, mid->mid); | |
374 | if (mid->midState == MID_REQUEST_SUBMITTED) { | |
375 | if (server->tcpStatus == CifsExiting) | |
376 | rc = -EHOSTDOWN; | |
dad255b1 | 377 | else |
053d5034 | 378 | mid->midState = MID_RETRY_NEEDED; |
053d5034 JL |
379 | } |
380 | ||
381 | if (rc != -EHOSTDOWN) { | |
382 | if (mid->midState == MID_RETRY_NEEDED) { | |
383 | rc = -EAGAIN; | |
384 | cFYI(1, "marking request for retry"); | |
385 | } else { | |
386 | rc = -EIO; | |
387 | } | |
388 | } | |
389 | spin_unlock(&GlobalMid_Lock); | |
390 | ||
391 | delete_mid(mid); | |
392 | return rc; | |
393 | } | |
394 | ||
7ee1af76 | 395 | int |
79a58d1f SF |
396 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
397 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 398 | const int flags) |
7ee1af76 JA |
399 | { |
400 | int rc = 0; | |
133672ef | 401 | int long_op; |
7ee1af76 | 402 | unsigned int receive_len; |
7ee1af76 JA |
403 | struct mid_q_entry *midQ; |
404 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 405 | |
133672ef SF |
406 | long_op = flags & CIFS_TIMEOUT_MASK; |
407 | ||
7ee1af76 JA |
408 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
409 | ||
410 | if ((ses == NULL) || (ses->server == NULL)) { | |
411 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 412 | cERROR(1, "Null session"); |
7ee1af76 JA |
413 | return -EIO; |
414 | } | |
415 | ||
79a58d1f | 416 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
417 | cifs_small_buf_release(in_buf); |
418 | return -ENOENT; | |
419 | } | |
420 | ||
79a58d1f | 421 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
422 | to the same server. We may make this configurable later or |
423 | use ses->maxReq */ | |
424 | ||
c5797a94 | 425 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
426 | if (rc) { |
427 | cifs_small_buf_release(in_buf); | |
428 | return rc; | |
429 | } | |
430 | ||
79a58d1f | 431 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
432 | and avoid races inside tcp sendmsg code that could cause corruption |
433 | of smb data */ | |
434 | ||
72ca545b | 435 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
436 | |
437 | rc = allocate_mid(ses, in_buf, &midQ); | |
438 | if (rc) { | |
72ca545b | 439 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 440 | cifs_small_buf_release(in_buf); |
7ee1af76 | 441 | /* Update # of requests on wire to server */ |
79a58d1f | 442 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
443 | wake_up(&ses->server->request_q); |
444 | return rc; | |
1da177e4 | 445 | } |
79a58d1f | 446 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
447 | if (rc) { |
448 | mutex_unlock(&ses->server->srv_mutex); | |
449 | cifs_small_buf_release(in_buf); | |
450 | goto out; | |
451 | } | |
1da177e4 LT |
452 | |
453 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
454 | #ifdef CONFIG_CIFS_STATS2 |
455 | atomic_inc(&ses->server->inSend); | |
456 | #endif | |
0496e02d | 457 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
458 | #ifdef CONFIG_CIFS_STATS2 |
459 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 460 | midQ->when_sent = jiffies; |
131afd0b | 461 | #endif |
7ee1af76 | 462 | |
72ca545b | 463 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
464 | cifs_small_buf_release(in_buf); |
465 | ||
79a58d1f | 466 | if (rc < 0) |
7ee1af76 | 467 | goto out; |
4b8f930f | 468 | |
0ade640e | 469 | if (long_op == CIFS_ASYNC_OP) |
133672ef | 470 | goto out; |
d6e04ae6 | 471 | |
0ade640e JL |
472 | rc = wait_for_response(ses->server, midQ); |
473 | if (rc != 0) | |
474 | goto out; | |
d6e04ae6 | 475 | |
053d5034 JL |
476 | rc = sync_mid_result(midQ, ses->server); |
477 | if (rc != 0) { | |
79a58d1f | 478 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 479 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
480 | return rc; |
481 | } | |
50c2f753 | 482 | |
8e4f2e8a VL |
483 | receive_len = midQ->resp_buf->smb_buf_length; |
484 | ||
d6e04ae6 | 485 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
486 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
487 | receive_len, xid); | |
d6e04ae6 | 488 | rc = -EIO; |
2b2bdfba SF |
489 | goto out; |
490 | } | |
491 | ||
492 | /* rcvd frame is ok */ | |
493 | ||
494 | if (midQ->resp_buf && | |
495 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
496 | ||
497 | iov[0].iov_base = (char *)midQ->resp_buf; | |
498 | if (midQ->largeBuf) | |
499 | *pRespBufType = CIFS_LARGE_BUFFER; | |
500 | else | |
501 | *pRespBufType = CIFS_SMALL_BUFFER; | |
502 | iov[0].iov_len = receive_len + 4; | |
503 | ||
504 | dump_smb(midQ->resp_buf, 80); | |
505 | /* convert the length into a more usable form */ | |
506 | if ((receive_len > 24) && | |
507 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
508 | SECMODE_SIGN_ENABLED))) { | |
509 | rc = cifs_verify_signature(midQ->resp_buf, | |
21e73393 | 510 | ses->server, |
d6e04ae6 | 511 | midQ->sequence_number+1); |
2b2bdfba | 512 | if (rc) { |
b6b38f70 | 513 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 514 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 515 | } |
d6e04ae6 | 516 | } |
2b2bdfba SF |
517 | |
518 | /* BB special case reconnect tid and uid here? */ | |
519 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
520 | flags & CIFS_LOG_ERROR); | |
521 | ||
522 | /* convert ByteCount if necessary */ | |
523 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
524 | /* do not count RFC1001 header */ + | |
525 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
526 | BCC(midQ->resp_buf) = | |
527 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
528 | if ((flags & CIFS_NO_RESP) == 0) | |
529 | midQ->resp_buf = NULL; /* mark it so buf will | |
530 | not be freed by | |
ddc8cf8f | 531 | delete_mid */ |
2b2bdfba SF |
532 | } else { |
533 | rc = -EIO; | |
b6b38f70 | 534 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 535 | } |
1da177e4 | 536 | |
7ee1af76 | 537 | out: |
ddc8cf8f | 538 | delete_mid(midQ); |
79a58d1f | 539 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 540 | wake_up(&ses->server->request_q); |
1da177e4 | 541 | |
d6e04ae6 SF |
542 | return rc; |
543 | } | |
1da177e4 LT |
544 | |
545 | int | |
546 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
547 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
548 | int *pbytes_returned, const int long_op) | |
549 | { | |
550 | int rc = 0; | |
551 | unsigned int receive_len; | |
1da177e4 LT |
552 | struct mid_q_entry *midQ; |
553 | ||
554 | if (ses == NULL) { | |
b6b38f70 | 555 | cERROR(1, "Null smb session"); |
1da177e4 LT |
556 | return -EIO; |
557 | } | |
79a58d1f | 558 | if (ses->server == NULL) { |
b6b38f70 | 559 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
560 | return -EIO; |
561 | } | |
562 | ||
79a58d1f | 563 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
564 | return -ENOENT; |
565 | ||
79a58d1f | 566 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
567 | to the same server. We may make this configurable later or |
568 | use ses->maxReq */ | |
1da177e4 | 569 | |
6d9c6d54 | 570 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
571 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
572 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
573 | return -EIO; |
574 | } | |
575 | ||
c5797a94 | 576 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
577 | if (rc) |
578 | return rc; | |
579 | ||
79a58d1f | 580 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
581 | and avoid races inside tcp sendmsg code that could cause corruption |
582 | of smb data */ | |
583 | ||
72ca545b | 584 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 585 | |
7ee1af76 JA |
586 | rc = allocate_mid(ses, in_buf, &midQ); |
587 | if (rc) { | |
72ca545b | 588 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 589 | /* Update # of requests on wire to server */ |
79a58d1f | 590 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
591 | wake_up(&ses->server->request_q); |
592 | return rc; | |
1da177e4 LT |
593 | } |
594 | ||
ad009ac9 | 595 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
596 | if (rc) { |
597 | mutex_unlock(&ses->server->srv_mutex); | |
598 | goto out; | |
599 | } | |
1da177e4 LT |
600 | |
601 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
602 | #ifdef CONFIG_CIFS_STATS2 |
603 | atomic_inc(&ses->server->inSend); | |
604 | #endif | |
0496e02d | 605 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
606 | #ifdef CONFIG_CIFS_STATS2 |
607 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 608 | midQ->when_sent = jiffies; |
131afd0b | 609 | #endif |
72ca545b | 610 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 611 | |
79a58d1f | 612 | if (rc < 0) |
7ee1af76 JA |
613 | goto out; |
614 | ||
0ade640e | 615 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 616 | goto out; |
1da177e4 | 617 | |
0ade640e JL |
618 | rc = wait_for_response(ses->server, midQ); |
619 | if (rc != 0) | |
620 | goto out; | |
1da177e4 | 621 | |
053d5034 JL |
622 | rc = sync_mid_result(midQ, ses->server); |
623 | if (rc != 0) { | |
79a58d1f | 624 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 625 | wake_up(&ses->server->request_q); |
1da177e4 LT |
626 | return rc; |
627 | } | |
50c2f753 | 628 | |
8e4f2e8a VL |
629 | receive_len = midQ->resp_buf->smb_buf_length; |
630 | ||
1da177e4 | 631 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
632 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
633 | receive_len, xid); | |
1da177e4 | 634 | rc = -EIO; |
2b2bdfba SF |
635 | goto out; |
636 | } | |
637 | ||
638 | /* rcvd frame is ok */ | |
639 | ||
640 | if (midQ->resp_buf && out_buf | |
641 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
642 | out_buf->smb_buf_length = receive_len; | |
643 | memcpy((char *)out_buf + 4, | |
644 | (char *)midQ->resp_buf + 4, | |
645 | receive_len); | |
646 | ||
647 | dump_smb(out_buf, 92); | |
648 | /* convert the length into a more usable form */ | |
649 | if ((receive_len > 24) && | |
650 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
651 | SECMODE_SIGN_ENABLED))) { | |
652 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 653 | ses->server, |
ad009ac9 | 654 | midQ->sequence_number+1); |
2b2bdfba | 655 | if (rc) { |
b6b38f70 | 656 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 657 | /* BB FIXME add code to kill session */ |
1da177e4 | 658 | } |
2b2bdfba | 659 | } |
1da177e4 | 660 | |
2b2bdfba | 661 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 662 | |
2b2bdfba SF |
663 | /* BB special case reconnect tid and uid here? */ |
664 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 665 | |
2b2bdfba SF |
666 | /* convert ByteCount if necessary */ |
667 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
668 | /* do not count RFC1001 header */ + | |
669 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
670 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
671 | } else { | |
672 | rc = -EIO; | |
b6b38f70 | 673 | cERROR(1, "Bad MID state?"); |
1da177e4 | 674 | } |
7ee1af76 JA |
675 | |
676 | out: | |
ddc8cf8f | 677 | delete_mid(midQ); |
79a58d1f | 678 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 679 | wake_up(&ses->server->request_q); |
1da177e4 | 680 | |
7ee1af76 JA |
681 | return rc; |
682 | } | |
1da177e4 | 683 | |
7ee1af76 JA |
684 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
685 | ||
686 | static int | |
687 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
688 | struct mid_q_entry *midQ) | |
689 | { | |
690 | int rc = 0; | |
691 | struct cifsSesInfo *ses = tcon->ses; | |
692 | __u16 mid = in_buf->Mid; | |
693 | ||
694 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
695 | in_buf->Mid = mid; | |
72ca545b | 696 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
697 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
698 | if (rc) { | |
72ca545b | 699 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
700 | return rc; |
701 | } | |
0496e02d | 702 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 703 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 704 | return rc; |
7ee1af76 JA |
705 | } |
706 | ||
707 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
708 | blocking lock to return. */ | |
709 | ||
710 | static int | |
711 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
712 | struct smb_hdr *in_buf, | |
713 | struct smb_hdr *out_buf) | |
714 | { | |
715 | int bytes_returned; | |
716 | struct cifsSesInfo *ses = tcon->ses; | |
717 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
718 | ||
719 | /* We just modify the current in_buf to change | |
720 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
721 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
722 | LOCKING_ANDX_CANCEL_LOCK. */ | |
723 | ||
724 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
725 | pSMB->Timeout = 0; | |
726 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
727 | ||
728 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 729 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
730 | } |
731 | ||
732 | int | |
733 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
734 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
735 | int *pbytes_returned) | |
736 | { | |
737 | int rc = 0; | |
738 | int rstart = 0; | |
739 | unsigned int receive_len; | |
740 | struct mid_q_entry *midQ; | |
741 | struct cifsSesInfo *ses; | |
742 | ||
743 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 744 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
745 | return -EIO; |
746 | } | |
747 | ses = tcon->ses; | |
748 | ||
79a58d1f | 749 | if (ses->server == NULL) { |
b6b38f70 | 750 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
751 | return -EIO; |
752 | } | |
753 | ||
79a58d1f | 754 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
755 | return -ENOENT; |
756 | ||
79a58d1f | 757 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
758 | to the same server. We may make this configurable later or |
759 | use ses->maxReq */ | |
760 | ||
6d9c6d54 | 761 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
762 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
763 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
764 | return -EIO; |
765 | } | |
766 | ||
c5797a94 | 767 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
768 | if (rc) |
769 | return rc; | |
770 | ||
79a58d1f | 771 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
772 | and avoid races inside tcp sendmsg code that could cause corruption |
773 | of smb data */ | |
774 | ||
72ca545b | 775 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
776 | |
777 | rc = allocate_mid(ses, in_buf, &midQ); | |
778 | if (rc) { | |
72ca545b | 779 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
780 | return rc; |
781 | } | |
782 | ||
7ee1af76 | 783 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 784 | if (rc) { |
ddc8cf8f | 785 | delete_mid(midQ); |
829049cb VL |
786 | mutex_unlock(&ses->server->srv_mutex); |
787 | return rc; | |
788 | } | |
1da177e4 | 789 | |
7ee1af76 JA |
790 | midQ->midState = MID_REQUEST_SUBMITTED; |
791 | #ifdef CONFIG_CIFS_STATS2 | |
792 | atomic_inc(&ses->server->inSend); | |
793 | #endif | |
0496e02d | 794 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
795 | #ifdef CONFIG_CIFS_STATS2 |
796 | atomic_dec(&ses->server->inSend); | |
797 | midQ->when_sent = jiffies; | |
798 | #endif | |
72ca545b | 799 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 800 | |
79a58d1f | 801 | if (rc < 0) { |
ddc8cf8f | 802 | delete_mid(midQ); |
7ee1af76 JA |
803 | return rc; |
804 | } | |
805 | ||
806 | /* Wait for a reply - allow signals to interrupt. */ | |
807 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 808 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
809 | ((ses->server->tcpStatus != CifsGood) && |
810 | (ses->server->tcpStatus != CifsNew))); | |
811 | ||
812 | /* Were we interrupted by a signal ? */ | |
813 | if ((rc == -ERESTARTSYS) && | |
814 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
815 | ((ses->server->tcpStatus == CifsGood) || | |
816 | (ses->server->tcpStatus == CifsNew))) { | |
817 | ||
818 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
819 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
820 | blocking lock to return. */ | |
821 | ||
822 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
823 | if (rc) { | |
ddc8cf8f | 824 | delete_mid(midQ); |
7ee1af76 JA |
825 | return rc; |
826 | } | |
827 | } else { | |
828 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
829 | to cause the blocking lock to return. */ | |
830 | ||
831 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
832 | ||
833 | /* If we get -ENOLCK back the lock may have | |
834 | already been removed. Don't exit in this case. */ | |
835 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 836 | delete_mid(midQ); |
7ee1af76 JA |
837 | return rc; |
838 | } | |
839 | } | |
840 | ||
0ade640e | 841 | if (wait_for_response(ses->server, midQ) == 0) { |
7ee1af76 JA |
842 | /* We got the response - restart system call. */ |
843 | rstart = 1; | |
844 | } | |
845 | } | |
846 | ||
053d5034 JL |
847 | rc = sync_mid_result(midQ, ses->server); |
848 | if (rc != 0) | |
7ee1af76 | 849 | return rc; |
50c2f753 | 850 | |
053d5034 | 851 | receive_len = midQ->resp_buf->smb_buf_length; |
7ee1af76 | 852 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
853 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
854 | receive_len, xid); | |
7ee1af76 | 855 | rc = -EIO; |
17c8bfed VL |
856 | goto out; |
857 | } | |
7ee1af76 | 858 | |
17c8bfed | 859 | /* rcvd frame is ok */ |
7ee1af76 | 860 | |
ac6a3ef4 | 861 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 862 | rc = -EIO; |
b6b38f70 | 863 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
864 | goto out; |
865 | } | |
1da177e4 | 866 | |
698e96a8 VL |
867 | out_buf->smb_buf_length = receive_len; |
868 | memcpy((char *)out_buf + 4, | |
869 | (char *)midQ->resp_buf + 4, | |
870 | receive_len); | |
871 | ||
872 | dump_smb(out_buf, 92); | |
873 | /* convert the length into a more usable form */ | |
874 | if ((receive_len > 24) && | |
875 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
876 | SECMODE_SIGN_ENABLED))) { | |
877 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 878 | ses->server, |
698e96a8 VL |
879 | midQ->sequence_number+1); |
880 | if (rc) { | |
b6b38f70 | 881 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 882 | /* BB FIXME add code to kill session */ |
7ee1af76 | 883 | } |
698e96a8 | 884 | } |
17c8bfed | 885 | |
698e96a8 | 886 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 887 | |
698e96a8 VL |
888 | /* BB special case reconnect tid and uid here? */ |
889 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 890 | |
698e96a8 VL |
891 | /* convert ByteCount if necessary */ |
892 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
893 | /* do not count RFC1001 header */ + | |
894 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
895 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
896 | |
897 | out: | |
ddc8cf8f | 898 | delete_mid(midQ); |
7ee1af76 JA |
899 | if (rstart && rc == -EACCES) |
900 | return -ERESTARTSYS; | |
1da177e4 LT |
901 | return rc; |
902 | } |