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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 | 38 | |
2b84a36c JL |
39 | static void |
40 | wake_up_task(struct mid_q_entry *mid) | |
41 | { | |
42 | wake_up_process(mid->callback_data); | |
43 | } | |
44 | ||
1da177e4 | 45 | static struct mid_q_entry * |
24b9b06b | 46 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
47 | { |
48 | struct mid_q_entry *temp; | |
49 | ||
24b9b06b | 50 | if (server == NULL) { |
b6b38f70 | 51 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
52 | return NULL; |
53 | } | |
50c2f753 | 54 | |
232087cb | 55 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
56 | if (temp == NULL) |
57 | return temp; | |
58 | else { | |
26f57364 | 59 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
60 | temp->mid = smb_buffer->Mid; /* always LE */ |
61 | temp->pid = current->pid; | |
62 | temp->command = smb_buffer->Command; | |
b6b38f70 | 63 | cFYI(1, "For smb_command %d", temp->command); |
1047abc1 SF |
64 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
65 | /* when mid allocated can be before when sent */ | |
66 | temp->when_alloc = jiffies; | |
2b84a36c JL |
67 | |
68 | /* | |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
72 | temp->callback = wake_up_task; | |
73 | temp->callback_data = current; | |
1da177e4 LT |
74 | } |
75 | ||
1da177e4 LT |
76 | atomic_inc(&midCount); |
77 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
78 | return temp; |
79 | } | |
80 | ||
81 | static void | |
82 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
83 | { | |
1047abc1 SF |
84 | #ifdef CONFIG_CIFS_STATS2 |
85 | unsigned long now; | |
86 | #endif | |
1da177e4 | 87 | midEntry->midState = MID_FREE; |
8097531a | 88 | atomic_dec(&midCount); |
79a58d1f | 89 | if (midEntry->largeBuf) |
b8643e1b SF |
90 | cifs_buf_release(midEntry->resp_buf); |
91 | else | |
92 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
93 | #ifdef CONFIG_CIFS_STATS2 |
94 | now = jiffies; | |
95 | /* commands taking longer than one second are indications that | |
96 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
97 | if ((now - midEntry->when_alloc) > HZ) { |
98 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
99 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
101 | midEntry->command, midEntry->mid); | |
102 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
103 | now - midEntry->when_alloc, | |
104 | now - midEntry->when_sent, | |
105 | now - midEntry->when_received); | |
106 | } | |
107 | } | |
108 | #endif | |
1da177e4 LT |
109 | mempool_free(midEntry, cifs_mid_poolp); |
110 | } | |
111 | ||
ddc8cf8f JL |
112 | static void |
113 | delete_mid(struct mid_q_entry *mid) | |
114 | { | |
115 | spin_lock(&GlobalMid_Lock); | |
116 | list_del(&mid->qhead); | |
117 | spin_unlock(&GlobalMid_Lock); | |
118 | ||
119 | DeleteMidQEntry(mid); | |
120 | } | |
121 | ||
d6e04ae6 | 122 | static int |
0496e02d | 123 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
124 | { |
125 | int rc = 0; | |
126 | int i = 0; | |
127 | struct msghdr smb_msg; | |
3e84469d SF |
128 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
129 | unsigned int len = iov[0].iov_len; | |
130 | unsigned int total_len; | |
131 | int first_vec = 0; | |
7ee1af76 | 132 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 133 | struct socket *ssocket = server->ssocket; |
50c2f753 | 134 | |
79a58d1f | 135 | if (ssocket == NULL) |
1da177e4 | 136 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 137 | |
a9f1b85e | 138 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 139 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
140 | smb_msg.msg_control = NULL; |
141 | smb_msg.msg_controllen = 0; | |
0496e02d | 142 | if (server->noblocksnd) |
edf1ae40 SF |
143 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
144 | else | |
145 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
146 | |
147 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
148 | area, and byte area if necessary, is converted to littleendian in |
149 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
150 | Flags2 is converted in SendReceive */ |
151 | ||
3e84469d SF |
152 | |
153 | total_len = 0; | |
154 | for (i = 0; i < n_vec; i++) | |
155 | total_len += iov[i].iov_len; | |
156 | ||
1da177e4 | 157 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
b6b38f70 | 158 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
159 | dump_smb(smb_buffer, len); |
160 | ||
17680356 | 161 | i = 0; |
3e84469d SF |
162 | while (total_len) { |
163 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
164 | n_vec - first_vec, total_len); | |
1da177e4 LT |
165 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
166 | i++; | |
da505c38 SF |
167 | /* if blocking send we try 3 times, since each can block |
168 | for 5 seconds. For nonblocking we have to try more | |
169 | but wait increasing amounts of time allowing time for | |
170 | socket to clear. The overall time we wait in either | |
171 | case to send on the socket is about 15 seconds. | |
172 | Similarly we wait for 15 seconds for | |
173 | a response from the server in SendReceive[2] | |
174 | for the server to send a response back for | |
175 | most types of requests (except SMB Write | |
176 | past end of file which can be slow, and | |
177 | blocking lock operations). NFS waits slightly longer | |
178 | than CIFS, but this can make it take longer for | |
179 | nonresponsive servers to be detected and 15 seconds | |
180 | is more than enough time for modern networks to | |
181 | send a packet. In most cases if we fail to send | |
182 | after the retries we will kill the socket and | |
183 | reconnect which may clear the network problem. | |
184 | */ | |
185 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
186 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
187 | ssocket); | |
1da177e4 LT |
188 | rc = -EAGAIN; |
189 | break; | |
190 | } | |
68058e75 | 191 | msleep(1 << i); |
1da177e4 LT |
192 | continue; |
193 | } | |
79a58d1f | 194 | if (rc < 0) |
1da177e4 | 195 | break; |
3e84469d | 196 | |
61de800d SF |
197 | if (rc == total_len) { |
198 | total_len = 0; | |
199 | break; | |
200 | } else if (rc > total_len) { | |
b6b38f70 | 201 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
202 | break; |
203 | } | |
79a58d1f | 204 | if (rc == 0) { |
3e84469d SF |
205 | /* should never happen, letting socket clear before |
206 | retrying is our only obvious option here */ | |
b6b38f70 | 207 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
208 | msleep(500); |
209 | continue; | |
d6e04ae6 | 210 | } |
3e84469d | 211 | total_len -= rc; |
68058e75 | 212 | /* the line below resets i */ |
3e84469d SF |
213 | for (i = first_vec; i < n_vec; i++) { |
214 | if (iov[i].iov_len) { | |
215 | if (rc > iov[i].iov_len) { | |
216 | rc -= iov[i].iov_len; | |
217 | iov[i].iov_len = 0; | |
218 | } else { | |
219 | iov[i].iov_base += rc; | |
220 | iov[i].iov_len -= rc; | |
221 | first_vec = i; | |
222 | break; | |
223 | } | |
224 | } | |
d6e04ae6 | 225 | } |
5e1253b5 | 226 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
227 | } |
228 | ||
edf1ae40 | 229 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
230 | cFYI(1, "partial send (%d remaining), terminating session", |
231 | total_len); | |
edf1ae40 SF |
232 | /* If we have only sent part of an SMB then the next SMB |
233 | could be taken as the remainder of this one. We need | |
234 | to kill the socket so the server throws away the partial | |
235 | SMB */ | |
236 | server->tcpStatus = CifsNeedReconnect; | |
237 | } | |
238 | ||
1da177e4 | 239 | if (rc < 0) { |
b6b38f70 | 240 | cERROR(1, "Error %d sending data on socket to server", rc); |
3e84469d | 241 | } else |
1da177e4 | 242 | rc = 0; |
1da177e4 | 243 | |
7ee1af76 JA |
244 | /* Don't want to modify the buffer as a |
245 | side effect of this call. */ | |
246 | smb_buffer->smb_buf_length = smb_buf_length; | |
247 | ||
1da177e4 LT |
248 | return rc; |
249 | } | |
250 | ||
0496e02d JL |
251 | int |
252 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
253 | unsigned int smb_buf_length) | |
254 | { | |
255 | struct kvec iov; | |
256 | ||
257 | iov.iov_base = smb_buffer; | |
258 | iov.iov_len = smb_buf_length + 4; | |
259 | ||
260 | return smb_sendv(server, &iov, 1); | |
261 | } | |
262 | ||
c5797a94 JL |
263 | static int wait_for_free_request(struct TCP_Server_Info *server, |
264 | const int long_op) | |
1da177e4 | 265 | { |
133672ef | 266 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 267 | /* oplock breaks must not be held up */ |
c5797a94 | 268 | atomic_inc(&server->inFlight); |
27a97a61 VL |
269 | return 0; |
270 | } | |
271 | ||
272 | spin_lock(&GlobalMid_Lock); | |
273 | while (1) { | |
c5797a94 | 274 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
27a97a61 | 275 | spin_unlock(&GlobalMid_Lock); |
131afd0b | 276 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 277 | atomic_inc(&server->num_waiters); |
131afd0b | 278 | #endif |
c5797a94 JL |
279 | wait_event(server->request_q, |
280 | atomic_read(&server->inFlight) | |
27a97a61 | 281 | < cifs_max_pending); |
131afd0b | 282 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 283 | atomic_dec(&server->num_waiters); |
131afd0b | 284 | #endif |
27a97a61 VL |
285 | spin_lock(&GlobalMid_Lock); |
286 | } else { | |
c5797a94 | 287 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 288 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 289 | return -ENOENT; |
1da177e4 | 290 | } |
27a97a61 VL |
291 | |
292 | /* can not count locking commands against total | |
293 | as they are allowed to block on server */ | |
294 | ||
295 | /* update # of requests on the wire to server */ | |
296 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 297 | atomic_inc(&server->inFlight); |
27a97a61 VL |
298 | spin_unlock(&GlobalMid_Lock); |
299 | break; | |
1da177e4 LT |
300 | } |
301 | } | |
7ee1af76 JA |
302 | return 0; |
303 | } | |
1da177e4 | 304 | |
7ee1af76 JA |
305 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
306 | struct mid_q_entry **ppmidQ) | |
307 | { | |
1da177e4 | 308 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 309 | return -ENOENT; |
8fbbd365 VL |
310 | } |
311 | ||
312 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 313 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 314 | return -EAGAIN; |
8fbbd365 VL |
315 | } |
316 | ||
317 | if (ses->status != CifsGood) { | |
1da177e4 | 318 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 319 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 320 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 321 | return -EAGAIN; |
ad7a2926 | 322 | /* else ok - we are setting up session */ |
1da177e4 | 323 | } |
24b9b06b | 324 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 325 | if (*ppmidQ == NULL) |
7ee1af76 | 326 | return -ENOMEM; |
ddc8cf8f JL |
327 | spin_lock(&GlobalMid_Lock); |
328 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
329 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
330 | return 0; |
331 | } | |
332 | ||
0ade640e JL |
333 | static int |
334 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 335 | { |
0ade640e | 336 | int error; |
7ee1af76 | 337 | |
0ade640e JL |
338 | error = wait_event_killable(server->response_q, |
339 | midQ->midState != MID_REQUEST_SUBMITTED); | |
340 | if (error < 0) | |
341 | return -ERESTARTSYS; | |
7ee1af76 | 342 | |
0ade640e | 343 | return 0; |
7ee1af76 JA |
344 | } |
345 | ||
133672ef SF |
346 | |
347 | /* | |
348 | * | |
349 | * Send an SMB Request. No response info (other than return code) | |
350 | * needs to be parsed. | |
351 | * | |
352 | * flags indicate the type of request buffer and how long to wait | |
353 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
354 | * | |
355 | */ | |
356 | int | |
357 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
358 | struct smb_hdr *in_buf, int flags) | |
359 | { | |
360 | int rc; | |
361 | struct kvec iov[1]; | |
362 | int resp_buf_type; | |
363 | ||
364 | iov[0].iov_base = (char *)in_buf; | |
365 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
366 | flags |= CIFS_NO_RESP; | |
367 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 368 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 369 | |
133672ef SF |
370 | return rc; |
371 | } | |
372 | ||
053d5034 JL |
373 | static int |
374 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) | |
375 | { | |
376 | int rc = 0; | |
377 | ||
74dd92a8 JL |
378 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
379 | mid->mid, mid->midState); | |
053d5034 | 380 | |
74dd92a8 | 381 | spin_lock(&GlobalMid_Lock); |
2b84a36c JL |
382 | /* ensure that it's no longer on the pending_mid_q */ |
383 | list_del_init(&mid->qhead); | |
384 | ||
74dd92a8 JL |
385 | switch (mid->midState) { |
386 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
387 | spin_unlock(&GlobalMid_Lock); |
388 | return rc; | |
74dd92a8 JL |
389 | case MID_REQUEST_SUBMITTED: |
390 | /* socket is going down, reject all calls */ | |
391 | if (server->tcpStatus == CifsExiting) { | |
392 | cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d", | |
393 | __func__, mid->mid, mid->command, mid->midState); | |
053d5034 | 394 | rc = -EHOSTDOWN; |
74dd92a8 | 395 | break; |
053d5034 | 396 | } |
74dd92a8 JL |
397 | case MID_RETRY_NEEDED: |
398 | rc = -EAGAIN; | |
399 | break; | |
400 | default: | |
401 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, | |
402 | mid->mid, mid->midState); | |
403 | rc = -EIO; | |
053d5034 JL |
404 | } |
405 | spin_unlock(&GlobalMid_Lock); | |
406 | ||
2b84a36c | 407 | DeleteMidQEntry(mid); |
053d5034 JL |
408 | return rc; |
409 | } | |
410 | ||
7ee1af76 | 411 | int |
79a58d1f SF |
412 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
413 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 414 | const int flags) |
7ee1af76 JA |
415 | { |
416 | int rc = 0; | |
133672ef | 417 | int long_op; |
7ee1af76 | 418 | unsigned int receive_len; |
7ee1af76 JA |
419 | struct mid_q_entry *midQ; |
420 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 421 | |
133672ef SF |
422 | long_op = flags & CIFS_TIMEOUT_MASK; |
423 | ||
7ee1af76 JA |
424 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
425 | ||
426 | if ((ses == NULL) || (ses->server == NULL)) { | |
427 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 428 | cERROR(1, "Null session"); |
7ee1af76 JA |
429 | return -EIO; |
430 | } | |
431 | ||
79a58d1f | 432 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
433 | cifs_small_buf_release(in_buf); |
434 | return -ENOENT; | |
435 | } | |
436 | ||
79a58d1f | 437 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
438 | to the same server. We may make this configurable later or |
439 | use ses->maxReq */ | |
440 | ||
c5797a94 | 441 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
442 | if (rc) { |
443 | cifs_small_buf_release(in_buf); | |
444 | return rc; | |
445 | } | |
446 | ||
79a58d1f | 447 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
448 | and avoid races inside tcp sendmsg code that could cause corruption |
449 | of smb data */ | |
450 | ||
72ca545b | 451 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
452 | |
453 | rc = allocate_mid(ses, in_buf, &midQ); | |
454 | if (rc) { | |
72ca545b | 455 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 456 | cifs_small_buf_release(in_buf); |
7ee1af76 | 457 | /* Update # of requests on wire to server */ |
79a58d1f | 458 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
459 | wake_up(&ses->server->request_q); |
460 | return rc; | |
1da177e4 | 461 | } |
79a58d1f | 462 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
463 | if (rc) { |
464 | mutex_unlock(&ses->server->srv_mutex); | |
465 | cifs_small_buf_release(in_buf); | |
466 | goto out; | |
467 | } | |
1da177e4 LT |
468 | |
469 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
470 | #ifdef CONFIG_CIFS_STATS2 |
471 | atomic_inc(&ses->server->inSend); | |
472 | #endif | |
0496e02d | 473 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
474 | #ifdef CONFIG_CIFS_STATS2 |
475 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 476 | midQ->when_sent = jiffies; |
131afd0b | 477 | #endif |
7ee1af76 | 478 | |
72ca545b | 479 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
480 | cifs_small_buf_release(in_buf); |
481 | ||
79a58d1f | 482 | if (rc < 0) |
7ee1af76 | 483 | goto out; |
4b8f930f | 484 | |
0ade640e | 485 | if (long_op == CIFS_ASYNC_OP) |
133672ef | 486 | goto out; |
d6e04ae6 | 487 | |
0ade640e JL |
488 | rc = wait_for_response(ses->server, midQ); |
489 | if (rc != 0) | |
490 | goto out; | |
d6e04ae6 | 491 | |
053d5034 JL |
492 | rc = sync_mid_result(midQ, ses->server); |
493 | if (rc != 0) { | |
79a58d1f | 494 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 495 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
496 | return rc; |
497 | } | |
50c2f753 | 498 | |
8e4f2e8a VL |
499 | receive_len = midQ->resp_buf->smb_buf_length; |
500 | ||
d6e04ae6 | 501 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
502 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
503 | receive_len, xid); | |
d6e04ae6 | 504 | rc = -EIO; |
2b2bdfba SF |
505 | goto out; |
506 | } | |
507 | ||
508 | /* rcvd frame is ok */ | |
509 | ||
510 | if (midQ->resp_buf && | |
511 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
512 | ||
513 | iov[0].iov_base = (char *)midQ->resp_buf; | |
514 | if (midQ->largeBuf) | |
515 | *pRespBufType = CIFS_LARGE_BUFFER; | |
516 | else | |
517 | *pRespBufType = CIFS_SMALL_BUFFER; | |
518 | iov[0].iov_len = receive_len + 4; | |
519 | ||
520 | dump_smb(midQ->resp_buf, 80); | |
521 | /* convert the length into a more usable form */ | |
522 | if ((receive_len > 24) && | |
523 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
524 | SECMODE_SIGN_ENABLED))) { | |
525 | rc = cifs_verify_signature(midQ->resp_buf, | |
21e73393 | 526 | ses->server, |
d6e04ae6 | 527 | midQ->sequence_number+1); |
2b2bdfba | 528 | if (rc) { |
b6b38f70 | 529 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 530 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 531 | } |
d6e04ae6 | 532 | } |
2b2bdfba SF |
533 | |
534 | /* BB special case reconnect tid and uid here? */ | |
535 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
536 | flags & CIFS_LOG_ERROR); | |
537 | ||
538 | /* convert ByteCount if necessary */ | |
539 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
540 | /* do not count RFC1001 header */ + | |
541 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
542 | BCC(midQ->resp_buf) = | |
543 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
544 | if ((flags & CIFS_NO_RESP) == 0) | |
545 | midQ->resp_buf = NULL; /* mark it so buf will | |
546 | not be freed by | |
ddc8cf8f | 547 | delete_mid */ |
2b2bdfba SF |
548 | } else { |
549 | rc = -EIO; | |
b6b38f70 | 550 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 551 | } |
1da177e4 | 552 | |
7ee1af76 | 553 | out: |
ddc8cf8f | 554 | delete_mid(midQ); |
79a58d1f | 555 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 556 | wake_up(&ses->server->request_q); |
1da177e4 | 557 | |
d6e04ae6 SF |
558 | return rc; |
559 | } | |
1da177e4 LT |
560 | |
561 | int | |
562 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
563 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
564 | int *pbytes_returned, const int long_op) | |
565 | { | |
566 | int rc = 0; | |
567 | unsigned int receive_len; | |
1da177e4 LT |
568 | struct mid_q_entry *midQ; |
569 | ||
570 | if (ses == NULL) { | |
b6b38f70 | 571 | cERROR(1, "Null smb session"); |
1da177e4 LT |
572 | return -EIO; |
573 | } | |
79a58d1f | 574 | if (ses->server == NULL) { |
b6b38f70 | 575 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
576 | return -EIO; |
577 | } | |
578 | ||
79a58d1f | 579 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
580 | return -ENOENT; |
581 | ||
79a58d1f | 582 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
583 | to the same server. We may make this configurable later or |
584 | use ses->maxReq */ | |
1da177e4 | 585 | |
6d9c6d54 | 586 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
587 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
588 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
589 | return -EIO; |
590 | } | |
591 | ||
c5797a94 | 592 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
593 | if (rc) |
594 | return rc; | |
595 | ||
79a58d1f | 596 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
597 | and avoid races inside tcp sendmsg code that could cause corruption |
598 | of smb data */ | |
599 | ||
72ca545b | 600 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 601 | |
7ee1af76 JA |
602 | rc = allocate_mid(ses, in_buf, &midQ); |
603 | if (rc) { | |
72ca545b | 604 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 605 | /* Update # of requests on wire to server */ |
79a58d1f | 606 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
607 | wake_up(&ses->server->request_q); |
608 | return rc; | |
1da177e4 LT |
609 | } |
610 | ||
ad009ac9 | 611 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
612 | if (rc) { |
613 | mutex_unlock(&ses->server->srv_mutex); | |
614 | goto out; | |
615 | } | |
1da177e4 LT |
616 | |
617 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
618 | #ifdef CONFIG_CIFS_STATS2 |
619 | atomic_inc(&ses->server->inSend); | |
620 | #endif | |
0496e02d | 621 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
622 | #ifdef CONFIG_CIFS_STATS2 |
623 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 624 | midQ->when_sent = jiffies; |
131afd0b | 625 | #endif |
72ca545b | 626 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 627 | |
79a58d1f | 628 | if (rc < 0) |
7ee1af76 JA |
629 | goto out; |
630 | ||
0ade640e | 631 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 632 | goto out; |
1da177e4 | 633 | |
0ade640e JL |
634 | rc = wait_for_response(ses->server, midQ); |
635 | if (rc != 0) | |
636 | goto out; | |
1da177e4 | 637 | |
053d5034 JL |
638 | rc = sync_mid_result(midQ, ses->server); |
639 | if (rc != 0) { | |
79a58d1f | 640 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 641 | wake_up(&ses->server->request_q); |
1da177e4 LT |
642 | return rc; |
643 | } | |
50c2f753 | 644 | |
8e4f2e8a VL |
645 | receive_len = midQ->resp_buf->smb_buf_length; |
646 | ||
1da177e4 | 647 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
648 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
649 | receive_len, xid); | |
1da177e4 | 650 | rc = -EIO; |
2b2bdfba SF |
651 | goto out; |
652 | } | |
653 | ||
654 | /* rcvd frame is ok */ | |
655 | ||
656 | if (midQ->resp_buf && out_buf | |
657 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
658 | out_buf->smb_buf_length = receive_len; | |
659 | memcpy((char *)out_buf + 4, | |
660 | (char *)midQ->resp_buf + 4, | |
661 | receive_len); | |
662 | ||
663 | dump_smb(out_buf, 92); | |
664 | /* convert the length into a more usable form */ | |
665 | if ((receive_len > 24) && | |
666 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
667 | SECMODE_SIGN_ENABLED))) { | |
668 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 669 | ses->server, |
ad009ac9 | 670 | midQ->sequence_number+1); |
2b2bdfba | 671 | if (rc) { |
b6b38f70 | 672 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 673 | /* BB FIXME add code to kill session */ |
1da177e4 | 674 | } |
2b2bdfba | 675 | } |
1da177e4 | 676 | |
2b2bdfba | 677 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 678 | |
2b2bdfba SF |
679 | /* BB special case reconnect tid and uid here? */ |
680 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 681 | |
2b2bdfba SF |
682 | /* convert ByteCount if necessary */ |
683 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
684 | /* do not count RFC1001 header */ + | |
685 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
686 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
687 | } else { | |
688 | rc = -EIO; | |
b6b38f70 | 689 | cERROR(1, "Bad MID state?"); |
1da177e4 | 690 | } |
7ee1af76 JA |
691 | |
692 | out: | |
ddc8cf8f | 693 | delete_mid(midQ); |
79a58d1f | 694 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 695 | wake_up(&ses->server->request_q); |
1da177e4 | 696 | |
7ee1af76 JA |
697 | return rc; |
698 | } | |
1da177e4 | 699 | |
7ee1af76 JA |
700 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
701 | ||
702 | static int | |
703 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
704 | struct mid_q_entry *midQ) | |
705 | { | |
706 | int rc = 0; | |
707 | struct cifsSesInfo *ses = tcon->ses; | |
708 | __u16 mid = in_buf->Mid; | |
709 | ||
710 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
711 | in_buf->Mid = mid; | |
72ca545b | 712 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
713 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
714 | if (rc) { | |
72ca545b | 715 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
716 | return rc; |
717 | } | |
0496e02d | 718 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 719 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 720 | return rc; |
7ee1af76 JA |
721 | } |
722 | ||
723 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
724 | blocking lock to return. */ | |
725 | ||
726 | static int | |
727 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
728 | struct smb_hdr *in_buf, | |
729 | struct smb_hdr *out_buf) | |
730 | { | |
731 | int bytes_returned; | |
732 | struct cifsSesInfo *ses = tcon->ses; | |
733 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
734 | ||
735 | /* We just modify the current in_buf to change | |
736 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
737 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
738 | LOCKING_ANDX_CANCEL_LOCK. */ | |
739 | ||
740 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
741 | pSMB->Timeout = 0; | |
742 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
743 | ||
744 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 745 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
746 | } |
747 | ||
748 | int | |
749 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
750 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
751 | int *pbytes_returned) | |
752 | { | |
753 | int rc = 0; | |
754 | int rstart = 0; | |
755 | unsigned int receive_len; | |
756 | struct mid_q_entry *midQ; | |
757 | struct cifsSesInfo *ses; | |
758 | ||
759 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 760 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
761 | return -EIO; |
762 | } | |
763 | ses = tcon->ses; | |
764 | ||
79a58d1f | 765 | if (ses->server == NULL) { |
b6b38f70 | 766 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
767 | return -EIO; |
768 | } | |
769 | ||
79a58d1f | 770 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
771 | return -ENOENT; |
772 | ||
79a58d1f | 773 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
774 | to the same server. We may make this configurable later or |
775 | use ses->maxReq */ | |
776 | ||
6d9c6d54 | 777 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
778 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
779 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
780 | return -EIO; |
781 | } | |
782 | ||
c5797a94 | 783 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
784 | if (rc) |
785 | return rc; | |
786 | ||
79a58d1f | 787 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
788 | and avoid races inside tcp sendmsg code that could cause corruption |
789 | of smb data */ | |
790 | ||
72ca545b | 791 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
792 | |
793 | rc = allocate_mid(ses, in_buf, &midQ); | |
794 | if (rc) { | |
72ca545b | 795 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
796 | return rc; |
797 | } | |
798 | ||
7ee1af76 | 799 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 800 | if (rc) { |
ddc8cf8f | 801 | delete_mid(midQ); |
829049cb VL |
802 | mutex_unlock(&ses->server->srv_mutex); |
803 | return rc; | |
804 | } | |
1da177e4 | 805 | |
7ee1af76 JA |
806 | midQ->midState = MID_REQUEST_SUBMITTED; |
807 | #ifdef CONFIG_CIFS_STATS2 | |
808 | atomic_inc(&ses->server->inSend); | |
809 | #endif | |
0496e02d | 810 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
811 | #ifdef CONFIG_CIFS_STATS2 |
812 | atomic_dec(&ses->server->inSend); | |
813 | midQ->when_sent = jiffies; | |
814 | #endif | |
72ca545b | 815 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 816 | |
79a58d1f | 817 | if (rc < 0) { |
ddc8cf8f | 818 | delete_mid(midQ); |
7ee1af76 JA |
819 | return rc; |
820 | } | |
821 | ||
822 | /* Wait for a reply - allow signals to interrupt. */ | |
823 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 824 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
825 | ((ses->server->tcpStatus != CifsGood) && |
826 | (ses->server->tcpStatus != CifsNew))); | |
827 | ||
828 | /* Were we interrupted by a signal ? */ | |
829 | if ((rc == -ERESTARTSYS) && | |
830 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
831 | ((ses->server->tcpStatus == CifsGood) || | |
832 | (ses->server->tcpStatus == CifsNew))) { | |
833 | ||
834 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
835 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
836 | blocking lock to return. */ | |
837 | ||
838 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
839 | if (rc) { | |
ddc8cf8f | 840 | delete_mid(midQ); |
7ee1af76 JA |
841 | return rc; |
842 | } | |
843 | } else { | |
844 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
845 | to cause the blocking lock to return. */ | |
846 | ||
847 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
848 | ||
849 | /* If we get -ENOLCK back the lock may have | |
850 | already been removed. Don't exit in this case. */ | |
851 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 852 | delete_mid(midQ); |
7ee1af76 JA |
853 | return rc; |
854 | } | |
855 | } | |
856 | ||
0ade640e | 857 | if (wait_for_response(ses->server, midQ) == 0) { |
7ee1af76 JA |
858 | /* We got the response - restart system call. */ |
859 | rstart = 1; | |
860 | } | |
861 | } | |
862 | ||
053d5034 JL |
863 | rc = sync_mid_result(midQ, ses->server); |
864 | if (rc != 0) | |
7ee1af76 | 865 | return rc; |
50c2f753 | 866 | |
053d5034 | 867 | receive_len = midQ->resp_buf->smb_buf_length; |
7ee1af76 | 868 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
869 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
870 | receive_len, xid); | |
7ee1af76 | 871 | rc = -EIO; |
17c8bfed VL |
872 | goto out; |
873 | } | |
7ee1af76 | 874 | |
17c8bfed | 875 | /* rcvd frame is ok */ |
7ee1af76 | 876 | |
ac6a3ef4 | 877 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 878 | rc = -EIO; |
b6b38f70 | 879 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
880 | goto out; |
881 | } | |
1da177e4 | 882 | |
698e96a8 VL |
883 | out_buf->smb_buf_length = receive_len; |
884 | memcpy((char *)out_buf + 4, | |
885 | (char *)midQ->resp_buf + 4, | |
886 | receive_len); | |
887 | ||
888 | dump_smb(out_buf, 92); | |
889 | /* convert the length into a more usable form */ | |
890 | if ((receive_len > 24) && | |
891 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
892 | SECMODE_SIGN_ENABLED))) { | |
893 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 894 | ses->server, |
698e96a8 VL |
895 | midQ->sequence_number+1); |
896 | if (rc) { | |
b6b38f70 | 897 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 898 | /* BB FIXME add code to kill session */ |
7ee1af76 | 899 | } |
698e96a8 | 900 | } |
17c8bfed | 901 | |
698e96a8 | 902 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 903 | |
698e96a8 VL |
904 | /* BB special case reconnect tid and uid here? */ |
905 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 906 | |
698e96a8 VL |
907 | /* convert ByteCount if necessary */ |
908 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
909 | /* do not count RFC1001 header */ + | |
910 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
911 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
912 | |
913 | out: | |
ddc8cf8f | 914 | delete_mid(midQ); |
7ee1af76 JA |
915 | if (rstart && rc == -EACCES) |
916 | return -ERESTARTSYS; | |
1da177e4 LT |
917 | return rc; |
918 | } |