Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/processor.h> | |
31 | #include <linux/mempool.h> | |
32 | #include "cifspdu.h" | |
33 | #include "cifsglob.h" | |
34 | #include "cifsproto.h" | |
35 | #include "cifs_debug.h" | |
50c2f753 | 36 | |
1da177e4 | 37 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 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 | ||
a6827c18 | 45 | 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 | ||
766fdbb5 | 81 | void |
1da177e4 LT |
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; | |
be8e3b00 | 132 | unsigned int smb_buf_length = be32_to_cpu(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 | 146 | |
3e84469d SF |
147 | total_len = 0; |
148 | for (i = 0; i < n_vec; i++) | |
149 | total_len += iov[i].iov_len; | |
150 | ||
b6b38f70 | 151 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
152 | dump_smb(smb_buffer, len); |
153 | ||
17680356 | 154 | i = 0; |
3e84469d SF |
155 | while (total_len) { |
156 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
157 | n_vec - first_vec, total_len); | |
1da177e4 LT |
158 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
159 | i++; | |
da505c38 SF |
160 | /* if blocking send we try 3 times, since each can block |
161 | for 5 seconds. For nonblocking we have to try more | |
162 | but wait increasing amounts of time allowing time for | |
163 | socket to clear. The overall time we wait in either | |
164 | case to send on the socket is about 15 seconds. | |
165 | Similarly we wait for 15 seconds for | |
166 | a response from the server in SendReceive[2] | |
167 | for the server to send a response back for | |
168 | most types of requests (except SMB Write | |
169 | past end of file which can be slow, and | |
170 | blocking lock operations). NFS waits slightly longer | |
171 | than CIFS, but this can make it take longer for | |
172 | nonresponsive servers to be detected and 15 seconds | |
173 | is more than enough time for modern networks to | |
174 | send a packet. In most cases if we fail to send | |
175 | after the retries we will kill the socket and | |
176 | reconnect which may clear the network problem. | |
177 | */ | |
178 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
179 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
180 | ssocket); | |
1da177e4 LT |
181 | rc = -EAGAIN; |
182 | break; | |
183 | } | |
68058e75 | 184 | msleep(1 << i); |
1da177e4 LT |
185 | continue; |
186 | } | |
79a58d1f | 187 | if (rc < 0) |
1da177e4 | 188 | break; |
3e84469d | 189 | |
61de800d SF |
190 | if (rc == total_len) { |
191 | total_len = 0; | |
192 | break; | |
193 | } else if (rc > total_len) { | |
b6b38f70 | 194 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
195 | break; |
196 | } | |
79a58d1f | 197 | if (rc == 0) { |
3e84469d SF |
198 | /* should never happen, letting socket clear before |
199 | retrying is our only obvious option here */ | |
b6b38f70 | 200 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
201 | msleep(500); |
202 | continue; | |
d6e04ae6 | 203 | } |
3e84469d | 204 | total_len -= rc; |
68058e75 | 205 | /* the line below resets i */ |
3e84469d SF |
206 | for (i = first_vec; i < n_vec; i++) { |
207 | if (iov[i].iov_len) { | |
208 | if (rc > iov[i].iov_len) { | |
209 | rc -= iov[i].iov_len; | |
210 | iov[i].iov_len = 0; | |
211 | } else { | |
212 | iov[i].iov_base += rc; | |
213 | iov[i].iov_len -= rc; | |
214 | first_vec = i; | |
215 | break; | |
216 | } | |
217 | } | |
d6e04ae6 | 218 | } |
5e1253b5 | 219 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
220 | } |
221 | ||
edf1ae40 | 222 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
223 | cFYI(1, "partial send (%d remaining), terminating session", |
224 | total_len); | |
edf1ae40 SF |
225 | /* If we have only sent part of an SMB then the next SMB |
226 | could be taken as the remainder of this one. We need | |
227 | to kill the socket so the server throws away the partial | |
228 | SMB */ | |
229 | server->tcpStatus = CifsNeedReconnect; | |
230 | } | |
231 | ||
d804d41d | 232 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 233 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 234 | else |
1da177e4 | 235 | rc = 0; |
1da177e4 | 236 | |
7ee1af76 JA |
237 | /* Don't want to modify the buffer as a |
238 | side effect of this call. */ | |
be8e3b00 | 239 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buf_length); |
7ee1af76 | 240 | |
1da177e4 LT |
241 | return rc; |
242 | } | |
243 | ||
0496e02d JL |
244 | int |
245 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
246 | unsigned int smb_buf_length) | |
247 | { | |
248 | struct kvec iov; | |
249 | ||
250 | iov.iov_base = smb_buffer; | |
251 | iov.iov_len = smb_buf_length + 4; | |
252 | ||
253 | return smb_sendv(server, &iov, 1); | |
254 | } | |
255 | ||
c5797a94 JL |
256 | static int wait_for_free_request(struct TCP_Server_Info *server, |
257 | const int long_op) | |
1da177e4 | 258 | { |
133672ef | 259 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 260 | /* oplock breaks must not be held up */ |
c5797a94 | 261 | atomic_inc(&server->inFlight); |
27a97a61 VL |
262 | return 0; |
263 | } | |
264 | ||
265 | spin_lock(&GlobalMid_Lock); | |
266 | while (1) { | |
c5797a94 | 267 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
27a97a61 | 268 | spin_unlock(&GlobalMid_Lock); |
131afd0b | 269 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 270 | atomic_inc(&server->num_waiters); |
131afd0b | 271 | #endif |
c5797a94 JL |
272 | wait_event(server->request_q, |
273 | atomic_read(&server->inFlight) | |
27a97a61 | 274 | < cifs_max_pending); |
131afd0b | 275 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 276 | atomic_dec(&server->num_waiters); |
131afd0b | 277 | #endif |
27a97a61 VL |
278 | spin_lock(&GlobalMid_Lock); |
279 | } else { | |
c5797a94 | 280 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 281 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 282 | return -ENOENT; |
1da177e4 | 283 | } |
27a97a61 VL |
284 | |
285 | /* can not count locking commands against total | |
286 | as they are allowed to block on server */ | |
287 | ||
288 | /* update # of requests on the wire to server */ | |
289 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 290 | atomic_inc(&server->inFlight); |
27a97a61 VL |
291 | spin_unlock(&GlobalMid_Lock); |
292 | break; | |
1da177e4 LT |
293 | } |
294 | } | |
7ee1af76 JA |
295 | return 0; |
296 | } | |
1da177e4 | 297 | |
7ee1af76 JA |
298 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
299 | struct mid_q_entry **ppmidQ) | |
300 | { | |
1da177e4 | 301 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 302 | return -ENOENT; |
8fbbd365 VL |
303 | } |
304 | ||
305 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 306 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 307 | return -EAGAIN; |
8fbbd365 VL |
308 | } |
309 | ||
310 | if (ses->status != CifsGood) { | |
1da177e4 | 311 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 312 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 313 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 314 | return -EAGAIN; |
ad7a2926 | 315 | /* else ok - we are setting up session */ |
1da177e4 | 316 | } |
24b9b06b | 317 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 318 | if (*ppmidQ == NULL) |
7ee1af76 | 319 | return -ENOMEM; |
ddc8cf8f JL |
320 | spin_lock(&GlobalMid_Lock); |
321 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
322 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
323 | return 0; |
324 | } | |
325 | ||
0ade640e JL |
326 | static int |
327 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 328 | { |
0ade640e | 329 | int error; |
7ee1af76 | 330 | |
0ade640e JL |
331 | error = wait_event_killable(server->response_q, |
332 | midQ->midState != MID_REQUEST_SUBMITTED); | |
333 | if (error < 0) | |
334 | return -ERESTARTSYS; | |
7ee1af76 | 335 | |
0ade640e | 336 | return 0; |
7ee1af76 JA |
337 | } |
338 | ||
133672ef | 339 | |
a6827c18 JL |
340 | /* |
341 | * Send a SMB request and set the callback function in the mid to handle | |
342 | * the result. Caller is responsible for dealing with timeouts. | |
343 | */ | |
344 | int | |
fcc31cb6 | 345 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
59ffd841 JL |
346 | unsigned int nvec, mid_callback_t *callback, void *cbdata, |
347 | bool ignore_pend) | |
a6827c18 JL |
348 | { |
349 | int rc; | |
350 | struct mid_q_entry *mid; | |
fcc31cb6 | 351 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
a6827c18 | 352 | |
59ffd841 | 353 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
354 | if (rc) |
355 | return rc; | |
356 | ||
e3f0dadb JL |
357 | /* enable signing if server requires it */ |
358 | if (server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
fcc31cb6 | 359 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
e3f0dadb | 360 | |
a6827c18 | 361 | mutex_lock(&server->srv_mutex); |
fcc31cb6 | 362 | mid = AllocMidQEntry(hdr, server); |
a6827c18 JL |
363 | if (mid == NULL) { |
364 | mutex_unlock(&server->srv_mutex); | |
365 | return -ENOMEM; | |
366 | } | |
367 | ||
368 | /* put it on the pending_mid_q */ | |
369 | spin_lock(&GlobalMid_Lock); | |
370 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
371 | spin_unlock(&GlobalMid_Lock); | |
372 | ||
fcc31cb6 | 373 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); |
a6827c18 JL |
374 | if (rc) { |
375 | mutex_unlock(&server->srv_mutex); | |
376 | goto out_err; | |
377 | } | |
378 | ||
379 | mid->callback = callback; | |
380 | mid->callback_data = cbdata; | |
381 | mid->midState = MID_REQUEST_SUBMITTED; | |
382 | #ifdef CONFIG_CIFS_STATS2 | |
383 | atomic_inc(&server->inSend); | |
384 | #endif | |
fcc31cb6 | 385 | rc = smb_sendv(server, iov, nvec); |
a6827c18 JL |
386 | #ifdef CONFIG_CIFS_STATS2 |
387 | atomic_dec(&server->inSend); | |
388 | mid->when_sent = jiffies; | |
389 | #endif | |
390 | mutex_unlock(&server->srv_mutex); | |
391 | if (rc) | |
392 | goto out_err; | |
393 | ||
394 | return rc; | |
395 | out_err: | |
396 | delete_mid(mid); | |
397 | atomic_dec(&server->inFlight); | |
398 | wake_up(&server->request_q); | |
399 | return rc; | |
400 | } | |
401 | ||
133672ef SF |
402 | /* |
403 | * | |
404 | * Send an SMB Request. No response info (other than return code) | |
405 | * needs to be parsed. | |
406 | * | |
407 | * flags indicate the type of request buffer and how long to wait | |
408 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
409 | * | |
410 | */ | |
411 | int | |
412 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
413 | struct smb_hdr *in_buf, int flags) | |
414 | { | |
415 | int rc; | |
416 | struct kvec iov[1]; | |
417 | int resp_buf_type; | |
418 | ||
419 | iov[0].iov_base = (char *)in_buf; | |
be8e3b00 | 420 | iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4; |
133672ef SF |
421 | flags |= CIFS_NO_RESP; |
422 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 423 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 424 | |
133672ef SF |
425 | return rc; |
426 | } | |
427 | ||
053d5034 JL |
428 | static int |
429 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) | |
430 | { | |
431 | int rc = 0; | |
432 | ||
74dd92a8 JL |
433 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
434 | mid->mid, mid->midState); | |
053d5034 | 435 | |
74dd92a8 | 436 | spin_lock(&GlobalMid_Lock); |
2b84a36c JL |
437 | /* ensure that it's no longer on the pending_mid_q */ |
438 | list_del_init(&mid->qhead); | |
439 | ||
74dd92a8 JL |
440 | switch (mid->midState) { |
441 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
442 | spin_unlock(&GlobalMid_Lock); |
443 | return rc; | |
74dd92a8 JL |
444 | case MID_REQUEST_SUBMITTED: |
445 | /* socket is going down, reject all calls */ | |
446 | if (server->tcpStatus == CifsExiting) { | |
447 | cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d", | |
448 | __func__, mid->mid, mid->command, mid->midState); | |
053d5034 | 449 | rc = -EHOSTDOWN; |
74dd92a8 | 450 | break; |
053d5034 | 451 | } |
74dd92a8 JL |
452 | case MID_RETRY_NEEDED: |
453 | rc = -EAGAIN; | |
454 | break; | |
71823baf JL |
455 | case MID_RESPONSE_MALFORMED: |
456 | rc = -EIO; | |
457 | break; | |
74dd92a8 JL |
458 | default: |
459 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, | |
460 | mid->mid, mid->midState); | |
461 | rc = -EIO; | |
053d5034 JL |
462 | } |
463 | spin_unlock(&GlobalMid_Lock); | |
464 | ||
2b84a36c | 465 | DeleteMidQEntry(mid); |
053d5034 JL |
466 | return rc; |
467 | } | |
468 | ||
76dcc26f JL |
469 | /* |
470 | * An NT cancel request header looks just like the original request except: | |
471 | * | |
472 | * The Command is SMB_COM_NT_CANCEL | |
473 | * The WordCount is zeroed out | |
474 | * The ByteCount is zeroed out | |
475 | * | |
476 | * This function mangles an existing request buffer into a | |
477 | * SMB_COM_NT_CANCEL request and then sends it. | |
478 | */ | |
479 | static int | |
480 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
481 | struct mid_q_entry *mid) | |
482 | { | |
483 | int rc = 0; | |
484 | ||
485 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 486 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
487 | in_buf->Command = SMB_COM_NT_CANCEL; |
488 | in_buf->WordCount = 0; | |
820a803f | 489 | put_bcc(0, in_buf); |
76dcc26f JL |
490 | |
491 | mutex_lock(&server->srv_mutex); | |
492 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
493 | if (rc) { | |
494 | mutex_unlock(&server->srv_mutex); | |
495 | return rc; | |
496 | } | |
be8e3b00 | 497 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
498 | mutex_unlock(&server->srv_mutex); |
499 | ||
500 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
501 | in_buf->Mid, rc); | |
502 | ||
503 | return rc; | |
504 | } | |
505 | ||
2c8f981d JL |
506 | int |
507 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
508 | bool log_error) | |
509 | { | |
510 | dump_smb(mid->resp_buf, | |
511 | min_t(u32, 92, be32_to_cpu(mid->resp_buf->smb_buf_length))); | |
512 | ||
513 | /* convert the length into a more usable form */ | |
514 | if (server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
515 | /* FIXME: add code to kill session */ | |
516 | if (cifs_verify_signature(mid->resp_buf, server, | |
517 | mid->sequence_number + 1) != 0) | |
518 | cERROR(1, "Unexpected SMB signature"); | |
519 | } | |
520 | ||
521 | /* BB special case reconnect tid and uid here? */ | |
522 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
523 | } | |
524 | ||
7ee1af76 | 525 | int |
79a58d1f SF |
526 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
527 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 528 | const int flags) |
7ee1af76 JA |
529 | { |
530 | int rc = 0; | |
133672ef | 531 | int long_op; |
7ee1af76 JA |
532 | struct mid_q_entry *midQ; |
533 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 534 | |
133672ef SF |
535 | long_op = flags & CIFS_TIMEOUT_MASK; |
536 | ||
7ee1af76 JA |
537 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
538 | ||
539 | if ((ses == NULL) || (ses->server == NULL)) { | |
540 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 541 | cERROR(1, "Null session"); |
7ee1af76 JA |
542 | return -EIO; |
543 | } | |
544 | ||
79a58d1f | 545 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
546 | cifs_small_buf_release(in_buf); |
547 | return -ENOENT; | |
548 | } | |
549 | ||
79a58d1f | 550 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
551 | to the same server. We may make this configurable later or |
552 | use ses->maxReq */ | |
553 | ||
c5797a94 | 554 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
555 | if (rc) { |
556 | cifs_small_buf_release(in_buf); | |
557 | return rc; | |
558 | } | |
559 | ||
79a58d1f | 560 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
561 | and avoid races inside tcp sendmsg code that could cause corruption |
562 | of smb data */ | |
563 | ||
72ca545b | 564 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
565 | |
566 | rc = allocate_mid(ses, in_buf, &midQ); | |
567 | if (rc) { | |
72ca545b | 568 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 569 | cifs_small_buf_release(in_buf); |
7ee1af76 | 570 | /* Update # of requests on wire to server */ |
79a58d1f | 571 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
572 | wake_up(&ses->server->request_q); |
573 | return rc; | |
1da177e4 | 574 | } |
79a58d1f | 575 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
576 | if (rc) { |
577 | mutex_unlock(&ses->server->srv_mutex); | |
578 | cifs_small_buf_release(in_buf); | |
579 | goto out; | |
580 | } | |
1da177e4 LT |
581 | |
582 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
583 | #ifdef CONFIG_CIFS_STATS2 |
584 | atomic_inc(&ses->server->inSend); | |
585 | #endif | |
0496e02d | 586 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
587 | #ifdef CONFIG_CIFS_STATS2 |
588 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 589 | midQ->when_sent = jiffies; |
131afd0b | 590 | #endif |
7ee1af76 | 591 | |
72ca545b | 592 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 593 | |
2db7c581 JL |
594 | if (rc < 0) { |
595 | cifs_small_buf_release(in_buf); | |
7ee1af76 | 596 | goto out; |
2db7c581 | 597 | } |
4b8f930f | 598 | |
2db7c581 JL |
599 | if (long_op == CIFS_ASYNC_OP) { |
600 | cifs_small_buf_release(in_buf); | |
133672ef | 601 | goto out; |
2db7c581 | 602 | } |
d6e04ae6 | 603 | |
0ade640e | 604 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 605 | if (rc != 0) { |
2db7c581 | 606 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
607 | spin_lock(&GlobalMid_Lock); |
608 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
609 | midQ->callback = DeleteMidQEntry; | |
610 | spin_unlock(&GlobalMid_Lock); | |
2db7c581 | 611 | cifs_small_buf_release(in_buf); |
1be912dd JL |
612 | atomic_dec(&ses->server->inFlight); |
613 | wake_up(&ses->server->request_q); | |
614 | return rc; | |
615 | } | |
616 | spin_unlock(&GlobalMid_Lock); | |
617 | } | |
d6e04ae6 | 618 | |
2db7c581 JL |
619 | cifs_small_buf_release(in_buf); |
620 | ||
053d5034 JL |
621 | rc = sync_mid_result(midQ, ses->server); |
622 | if (rc != 0) { | |
79a58d1f | 623 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 624 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
625 | return rc; |
626 | } | |
50c2f753 | 627 | |
2c8f981d | 628 | if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 629 | rc = -EIO; |
2c8f981d | 630 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
631 | goto out; |
632 | } | |
633 | ||
2c8f981d JL |
634 | iov[0].iov_base = (char *)midQ->resp_buf; |
635 | iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; | |
636 | if (midQ->largeBuf) | |
637 | *pRespBufType = CIFS_LARGE_BUFFER; | |
638 | else | |
639 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 640 | |
2c8f981d | 641 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 642 | |
2c8f981d JL |
643 | /* mark it so buf will not be freed by delete_mid */ |
644 | if ((flags & CIFS_NO_RESP) == 0) | |
645 | midQ->resp_buf = NULL; | |
7ee1af76 | 646 | out: |
ddc8cf8f | 647 | delete_mid(midQ); |
79a58d1f | 648 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 649 | wake_up(&ses->server->request_q); |
1da177e4 | 650 | |
d6e04ae6 SF |
651 | return rc; |
652 | } | |
1da177e4 LT |
653 | |
654 | int | |
655 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
656 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
657 | int *pbytes_returned, const int long_op) | |
658 | { | |
659 | int rc = 0; | |
1da177e4 LT |
660 | struct mid_q_entry *midQ; |
661 | ||
662 | if (ses == NULL) { | |
b6b38f70 | 663 | cERROR(1, "Null smb session"); |
1da177e4 LT |
664 | return -EIO; |
665 | } | |
79a58d1f | 666 | if (ses->server == NULL) { |
b6b38f70 | 667 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
668 | return -EIO; |
669 | } | |
670 | ||
79a58d1f | 671 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
672 | return -ENOENT; |
673 | ||
79a58d1f | 674 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
675 | to the same server. We may make this configurable later or |
676 | use ses->maxReq */ | |
1da177e4 | 677 | |
be8e3b00 SF |
678 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
679 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 680 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 681 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
682 | return -EIO; |
683 | } | |
684 | ||
c5797a94 | 685 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
686 | if (rc) |
687 | return rc; | |
688 | ||
79a58d1f | 689 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
690 | and avoid races inside tcp sendmsg code that could cause corruption |
691 | of smb data */ | |
692 | ||
72ca545b | 693 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 694 | |
7ee1af76 JA |
695 | rc = allocate_mid(ses, in_buf, &midQ); |
696 | if (rc) { | |
72ca545b | 697 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 698 | /* Update # of requests on wire to server */ |
79a58d1f | 699 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
700 | wake_up(&ses->server->request_q); |
701 | return rc; | |
1da177e4 LT |
702 | } |
703 | ||
ad009ac9 | 704 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
705 | if (rc) { |
706 | mutex_unlock(&ses->server->srv_mutex); | |
707 | goto out; | |
708 | } | |
1da177e4 LT |
709 | |
710 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
711 | #ifdef CONFIG_CIFS_STATS2 |
712 | atomic_inc(&ses->server->inSend); | |
713 | #endif | |
be8e3b00 | 714 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
131afd0b SF |
715 | #ifdef CONFIG_CIFS_STATS2 |
716 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 717 | midQ->when_sent = jiffies; |
131afd0b | 718 | #endif |
72ca545b | 719 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 720 | |
79a58d1f | 721 | if (rc < 0) |
7ee1af76 JA |
722 | goto out; |
723 | ||
0ade640e | 724 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 725 | goto out; |
1da177e4 | 726 | |
0ade640e | 727 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 728 | if (rc != 0) { |
2db7c581 | 729 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
730 | spin_lock(&GlobalMid_Lock); |
731 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
732 | /* no longer considered to be "in-flight" */ | |
733 | midQ->callback = DeleteMidQEntry; | |
734 | spin_unlock(&GlobalMid_Lock); | |
735 | atomic_dec(&ses->server->inFlight); | |
736 | wake_up(&ses->server->request_q); | |
737 | return rc; | |
738 | } | |
739 | spin_unlock(&GlobalMid_Lock); | |
740 | } | |
1da177e4 | 741 | |
053d5034 JL |
742 | rc = sync_mid_result(midQ, ses->server); |
743 | if (rc != 0) { | |
79a58d1f | 744 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 745 | wake_up(&ses->server->request_q); |
1da177e4 LT |
746 | return rc; |
747 | } | |
50c2f753 | 748 | |
2c8f981d JL |
749 | if (!midQ->resp_buf || !out_buf || |
750 | midQ->midState != MID_RESPONSE_RECEIVED) { | |
2b2bdfba | 751 | rc = -EIO; |
b6b38f70 | 752 | cERROR(1, "Bad MID state?"); |
2c8f981d | 753 | goto out; |
1da177e4 | 754 | } |
7ee1af76 | 755 | |
2c8f981d JL |
756 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
757 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
758 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 759 | out: |
ddc8cf8f | 760 | delete_mid(midQ); |
79a58d1f | 761 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 762 | wake_up(&ses->server->request_q); |
1da177e4 | 763 | |
7ee1af76 JA |
764 | return rc; |
765 | } | |
1da177e4 | 766 | |
7ee1af76 JA |
767 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
768 | blocking lock to return. */ | |
769 | ||
770 | static int | |
771 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
772 | struct smb_hdr *in_buf, | |
773 | struct smb_hdr *out_buf) | |
774 | { | |
775 | int bytes_returned; | |
776 | struct cifsSesInfo *ses = tcon->ses; | |
777 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
778 | ||
779 | /* We just modify the current in_buf to change | |
780 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
781 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
782 | LOCKING_ANDX_CANCEL_LOCK. */ | |
783 | ||
784 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
785 | pSMB->Timeout = 0; | |
786 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
787 | ||
788 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 789 | &bytes_returned, 0); |
7ee1af76 JA |
790 | } |
791 | ||
792 | int | |
793 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
794 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
795 | int *pbytes_returned) | |
796 | { | |
797 | int rc = 0; | |
798 | int rstart = 0; | |
7ee1af76 JA |
799 | struct mid_q_entry *midQ; |
800 | struct cifsSesInfo *ses; | |
801 | ||
802 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 803 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
804 | return -EIO; |
805 | } | |
806 | ses = tcon->ses; | |
807 | ||
79a58d1f | 808 | if (ses->server == NULL) { |
b6b38f70 | 809 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
810 | return -EIO; |
811 | } | |
812 | ||
79a58d1f | 813 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
814 | return -ENOENT; |
815 | ||
79a58d1f | 816 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
817 | to the same server. We may make this configurable later or |
818 | use ses->maxReq */ | |
819 | ||
be8e3b00 SF |
820 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
821 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 822 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 823 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
824 | return -EIO; |
825 | } | |
826 | ||
c5797a94 | 827 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
828 | if (rc) |
829 | return rc; | |
830 | ||
79a58d1f | 831 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
832 | and avoid races inside tcp sendmsg code that could cause corruption |
833 | of smb data */ | |
834 | ||
72ca545b | 835 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
836 | |
837 | rc = allocate_mid(ses, in_buf, &midQ); | |
838 | if (rc) { | |
72ca545b | 839 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
840 | return rc; |
841 | } | |
842 | ||
7ee1af76 | 843 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 844 | if (rc) { |
ddc8cf8f | 845 | delete_mid(midQ); |
829049cb VL |
846 | mutex_unlock(&ses->server->srv_mutex); |
847 | return rc; | |
848 | } | |
1da177e4 | 849 | |
7ee1af76 JA |
850 | midQ->midState = MID_REQUEST_SUBMITTED; |
851 | #ifdef CONFIG_CIFS_STATS2 | |
852 | atomic_inc(&ses->server->inSend); | |
853 | #endif | |
be8e3b00 | 854 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
7ee1af76 JA |
855 | #ifdef CONFIG_CIFS_STATS2 |
856 | atomic_dec(&ses->server->inSend); | |
857 | midQ->when_sent = jiffies; | |
858 | #endif | |
72ca545b | 859 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 860 | |
79a58d1f | 861 | if (rc < 0) { |
ddc8cf8f | 862 | delete_mid(midQ); |
7ee1af76 JA |
863 | return rc; |
864 | } | |
865 | ||
866 | /* Wait for a reply - allow signals to interrupt. */ | |
867 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 868 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
869 | ((ses->server->tcpStatus != CifsGood) && |
870 | (ses->server->tcpStatus != CifsNew))); | |
871 | ||
872 | /* Were we interrupted by a signal ? */ | |
873 | if ((rc == -ERESTARTSYS) && | |
874 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
875 | ((ses->server->tcpStatus == CifsGood) || | |
876 | (ses->server->tcpStatus == CifsNew))) { | |
877 | ||
878 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
879 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
880 | blocking lock to return. */ | |
76dcc26f | 881 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 882 | if (rc) { |
ddc8cf8f | 883 | delete_mid(midQ); |
7ee1af76 JA |
884 | return rc; |
885 | } | |
886 | } else { | |
887 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
888 | to cause the blocking lock to return. */ | |
889 | ||
890 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
891 | ||
892 | /* If we get -ENOLCK back the lock may have | |
893 | already been removed. Don't exit in this case. */ | |
894 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 895 | delete_mid(midQ); |
7ee1af76 JA |
896 | return rc; |
897 | } | |
898 | } | |
899 | ||
1be912dd JL |
900 | rc = wait_for_response(ses->server, midQ); |
901 | if (rc) { | |
2db7c581 | 902 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
903 | spin_lock(&GlobalMid_Lock); |
904 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
905 | /* no longer considered to be "in-flight" */ | |
906 | midQ->callback = DeleteMidQEntry; | |
907 | spin_unlock(&GlobalMid_Lock); | |
908 | return rc; | |
909 | } | |
910 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 911 | } |
1be912dd JL |
912 | |
913 | /* We got the response - restart system call. */ | |
914 | rstart = 1; | |
7ee1af76 JA |
915 | } |
916 | ||
053d5034 JL |
917 | rc = sync_mid_result(midQ, ses->server); |
918 | if (rc != 0) | |
7ee1af76 | 919 | return rc; |
50c2f753 | 920 | |
17c8bfed | 921 | /* rcvd frame is ok */ |
2c8f981d | 922 | if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) { |
698e96a8 | 923 | rc = -EIO; |
b6b38f70 | 924 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
925 | goto out; |
926 | } | |
1da177e4 | 927 | |
2c8f981d JL |
928 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
929 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
930 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 931 | out: |
ddc8cf8f | 932 | delete_mid(midQ); |
7ee1af76 JA |
933 | if (rstart && rc == -EACCES) |
934 | return -ERESTARTSYS; | |
1da177e4 LT |
935 | return rc; |
936 | } |