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 | |
96daf2b0 | 298 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
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 | 357 | /* enable signing if server requires it */ |
96daf2b0 | 358 | if (server->sec_mode & (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 | |
96daf2b0 | 412 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
133672ef SF |
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 | 428 | static int |
3c1105df | 429 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
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 JL |
436 | spin_lock(&GlobalMid_Lock); |
437 | switch (mid->midState) { | |
438 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
439 | spin_unlock(&GlobalMid_Lock); |
440 | return rc; | |
74dd92a8 JL |
441 | case MID_RETRY_NEEDED: |
442 | rc = -EAGAIN; | |
443 | break; | |
71823baf JL |
444 | case MID_RESPONSE_MALFORMED: |
445 | rc = -EIO; | |
446 | break; | |
3c1105df JL |
447 | case MID_SHUTDOWN: |
448 | rc = -EHOSTDOWN; | |
449 | break; | |
74dd92a8 | 450 | default: |
3c1105df | 451 | list_del_init(&mid->qhead); |
74dd92a8 JL |
452 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, |
453 | mid->mid, mid->midState); | |
454 | rc = -EIO; | |
053d5034 JL |
455 | } |
456 | spin_unlock(&GlobalMid_Lock); | |
457 | ||
2b84a36c | 458 | DeleteMidQEntry(mid); |
053d5034 JL |
459 | return rc; |
460 | } | |
461 | ||
76dcc26f JL |
462 | /* |
463 | * An NT cancel request header looks just like the original request except: | |
464 | * | |
465 | * The Command is SMB_COM_NT_CANCEL | |
466 | * The WordCount is zeroed out | |
467 | * The ByteCount is zeroed out | |
468 | * | |
469 | * This function mangles an existing request buffer into a | |
470 | * SMB_COM_NT_CANCEL request and then sends it. | |
471 | */ | |
472 | static int | |
473 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
474 | struct mid_q_entry *mid) | |
475 | { | |
476 | int rc = 0; | |
477 | ||
478 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 479 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
480 | in_buf->Command = SMB_COM_NT_CANCEL; |
481 | in_buf->WordCount = 0; | |
820a803f | 482 | put_bcc(0, in_buf); |
76dcc26f JL |
483 | |
484 | mutex_lock(&server->srv_mutex); | |
485 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
486 | if (rc) { | |
487 | mutex_unlock(&server->srv_mutex); | |
488 | return rc; | |
489 | } | |
be8e3b00 | 490 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
491 | mutex_unlock(&server->srv_mutex); |
492 | ||
493 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
494 | in_buf->Mid, rc); | |
495 | ||
496 | return rc; | |
497 | } | |
498 | ||
2c8f981d JL |
499 | int |
500 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
501 | bool log_error) | |
502 | { | |
503 | dump_smb(mid->resp_buf, | |
504 | min_t(u32, 92, be32_to_cpu(mid->resp_buf->smb_buf_length))); | |
505 | ||
506 | /* convert the length into a more usable form */ | |
96daf2b0 | 507 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
2c8f981d JL |
508 | /* FIXME: add code to kill session */ |
509 | if (cifs_verify_signature(mid->resp_buf, server, | |
510 | mid->sequence_number + 1) != 0) | |
511 | cERROR(1, "Unexpected SMB signature"); | |
512 | } | |
513 | ||
514 | /* BB special case reconnect tid and uid here? */ | |
515 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
516 | } | |
517 | ||
7ee1af76 | 518 | int |
96daf2b0 | 519 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 520 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 521 | const int flags) |
7ee1af76 JA |
522 | { |
523 | int rc = 0; | |
133672ef | 524 | int long_op; |
7ee1af76 JA |
525 | struct mid_q_entry *midQ; |
526 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 527 | |
133672ef SF |
528 | long_op = flags & CIFS_TIMEOUT_MASK; |
529 | ||
7ee1af76 JA |
530 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
531 | ||
532 | if ((ses == NULL) || (ses->server == NULL)) { | |
533 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 534 | cERROR(1, "Null session"); |
7ee1af76 JA |
535 | return -EIO; |
536 | } | |
537 | ||
79a58d1f | 538 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
539 | cifs_small_buf_release(in_buf); |
540 | return -ENOENT; | |
541 | } | |
542 | ||
79a58d1f | 543 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
544 | to the same server. We may make this configurable later or |
545 | use ses->maxReq */ | |
546 | ||
c5797a94 | 547 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
548 | if (rc) { |
549 | cifs_small_buf_release(in_buf); | |
550 | return rc; | |
551 | } | |
552 | ||
79a58d1f | 553 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
554 | and avoid races inside tcp sendmsg code that could cause corruption |
555 | of smb data */ | |
556 | ||
72ca545b | 557 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
558 | |
559 | rc = allocate_mid(ses, in_buf, &midQ); | |
560 | if (rc) { | |
72ca545b | 561 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 562 | cifs_small_buf_release(in_buf); |
7ee1af76 | 563 | /* Update # of requests on wire to server */ |
79a58d1f | 564 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
565 | wake_up(&ses->server->request_q); |
566 | return rc; | |
1da177e4 | 567 | } |
79a58d1f | 568 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
569 | if (rc) { |
570 | mutex_unlock(&ses->server->srv_mutex); | |
571 | cifs_small_buf_release(in_buf); | |
572 | goto out; | |
573 | } | |
1da177e4 LT |
574 | |
575 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
576 | #ifdef CONFIG_CIFS_STATS2 |
577 | atomic_inc(&ses->server->inSend); | |
578 | #endif | |
0496e02d | 579 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
580 | #ifdef CONFIG_CIFS_STATS2 |
581 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 582 | midQ->when_sent = jiffies; |
131afd0b | 583 | #endif |
7ee1af76 | 584 | |
72ca545b | 585 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 586 | |
2db7c581 JL |
587 | if (rc < 0) { |
588 | cifs_small_buf_release(in_buf); | |
7ee1af76 | 589 | goto out; |
2db7c581 | 590 | } |
4b8f930f | 591 | |
2db7c581 JL |
592 | if (long_op == CIFS_ASYNC_OP) { |
593 | cifs_small_buf_release(in_buf); | |
133672ef | 594 | goto out; |
2db7c581 | 595 | } |
d6e04ae6 | 596 | |
0ade640e | 597 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 598 | if (rc != 0) { |
2db7c581 | 599 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
600 | spin_lock(&GlobalMid_Lock); |
601 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
602 | midQ->callback = DeleteMidQEntry; | |
603 | spin_unlock(&GlobalMid_Lock); | |
2db7c581 | 604 | cifs_small_buf_release(in_buf); |
1be912dd JL |
605 | atomic_dec(&ses->server->inFlight); |
606 | wake_up(&ses->server->request_q); | |
607 | return rc; | |
608 | } | |
609 | spin_unlock(&GlobalMid_Lock); | |
610 | } | |
d6e04ae6 | 611 | |
2db7c581 JL |
612 | cifs_small_buf_release(in_buf); |
613 | ||
3c1105df | 614 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 615 | if (rc != 0) { |
79a58d1f | 616 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 617 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
618 | return rc; |
619 | } | |
50c2f753 | 620 | |
2c8f981d | 621 | if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 622 | rc = -EIO; |
2c8f981d | 623 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
624 | goto out; |
625 | } | |
626 | ||
2c8f981d JL |
627 | iov[0].iov_base = (char *)midQ->resp_buf; |
628 | iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; | |
629 | if (midQ->largeBuf) | |
630 | *pRespBufType = CIFS_LARGE_BUFFER; | |
631 | else | |
632 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 633 | |
2c8f981d | 634 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 635 | |
2c8f981d JL |
636 | /* mark it so buf will not be freed by delete_mid */ |
637 | if ((flags & CIFS_NO_RESP) == 0) | |
638 | midQ->resp_buf = NULL; | |
7ee1af76 | 639 | out: |
ddc8cf8f | 640 | delete_mid(midQ); |
79a58d1f | 641 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 642 | wake_up(&ses->server->request_q); |
1da177e4 | 643 | |
d6e04ae6 SF |
644 | return rc; |
645 | } | |
1da177e4 LT |
646 | |
647 | int | |
96daf2b0 | 648 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
649 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
650 | int *pbytes_returned, const int long_op) | |
651 | { | |
652 | int rc = 0; | |
1da177e4 LT |
653 | struct mid_q_entry *midQ; |
654 | ||
655 | if (ses == NULL) { | |
b6b38f70 | 656 | cERROR(1, "Null smb session"); |
1da177e4 LT |
657 | return -EIO; |
658 | } | |
79a58d1f | 659 | if (ses->server == NULL) { |
b6b38f70 | 660 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
661 | return -EIO; |
662 | } | |
663 | ||
79a58d1f | 664 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
665 | return -ENOENT; |
666 | ||
79a58d1f | 667 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
668 | to the same server. We may make this configurable later or |
669 | use ses->maxReq */ | |
1da177e4 | 670 | |
be8e3b00 SF |
671 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
672 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 673 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 674 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
675 | return -EIO; |
676 | } | |
677 | ||
c5797a94 | 678 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
679 | if (rc) |
680 | return rc; | |
681 | ||
79a58d1f | 682 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
683 | and avoid races inside tcp sendmsg code that could cause corruption |
684 | of smb data */ | |
685 | ||
72ca545b | 686 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 687 | |
7ee1af76 JA |
688 | rc = allocate_mid(ses, in_buf, &midQ); |
689 | if (rc) { | |
72ca545b | 690 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 691 | /* Update # of requests on wire to server */ |
79a58d1f | 692 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
693 | wake_up(&ses->server->request_q); |
694 | return rc; | |
1da177e4 LT |
695 | } |
696 | ||
ad009ac9 | 697 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
698 | if (rc) { |
699 | mutex_unlock(&ses->server->srv_mutex); | |
700 | goto out; | |
701 | } | |
1da177e4 LT |
702 | |
703 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
704 | #ifdef CONFIG_CIFS_STATS2 |
705 | atomic_inc(&ses->server->inSend); | |
706 | #endif | |
be8e3b00 | 707 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
131afd0b SF |
708 | #ifdef CONFIG_CIFS_STATS2 |
709 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 710 | midQ->when_sent = jiffies; |
131afd0b | 711 | #endif |
72ca545b | 712 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 713 | |
79a58d1f | 714 | if (rc < 0) |
7ee1af76 JA |
715 | goto out; |
716 | ||
0ade640e | 717 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 718 | goto out; |
1da177e4 | 719 | |
0ade640e | 720 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 721 | if (rc != 0) { |
2db7c581 | 722 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
723 | spin_lock(&GlobalMid_Lock); |
724 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
725 | /* no longer considered to be "in-flight" */ | |
726 | midQ->callback = DeleteMidQEntry; | |
727 | spin_unlock(&GlobalMid_Lock); | |
728 | atomic_dec(&ses->server->inFlight); | |
729 | wake_up(&ses->server->request_q); | |
730 | return rc; | |
731 | } | |
732 | spin_unlock(&GlobalMid_Lock); | |
733 | } | |
1da177e4 | 734 | |
3c1105df | 735 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 736 | if (rc != 0) { |
79a58d1f | 737 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 738 | wake_up(&ses->server->request_q); |
1da177e4 LT |
739 | return rc; |
740 | } | |
50c2f753 | 741 | |
2c8f981d JL |
742 | if (!midQ->resp_buf || !out_buf || |
743 | midQ->midState != MID_RESPONSE_RECEIVED) { | |
2b2bdfba | 744 | rc = -EIO; |
b6b38f70 | 745 | cERROR(1, "Bad MID state?"); |
2c8f981d | 746 | goto out; |
1da177e4 | 747 | } |
7ee1af76 | 748 | |
2c8f981d JL |
749 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
750 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
751 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 752 | out: |
ddc8cf8f | 753 | delete_mid(midQ); |
79a58d1f | 754 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 755 | wake_up(&ses->server->request_q); |
1da177e4 | 756 | |
7ee1af76 JA |
757 | return rc; |
758 | } | |
1da177e4 | 759 | |
7ee1af76 JA |
760 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
761 | blocking lock to return. */ | |
762 | ||
763 | static int | |
96daf2b0 | 764 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
765 | struct smb_hdr *in_buf, |
766 | struct smb_hdr *out_buf) | |
767 | { | |
768 | int bytes_returned; | |
96daf2b0 | 769 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
770 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
771 | ||
772 | /* We just modify the current in_buf to change | |
773 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
774 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
775 | LOCKING_ANDX_CANCEL_LOCK. */ | |
776 | ||
777 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
778 | pSMB->Timeout = 0; | |
779 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
780 | ||
781 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 782 | &bytes_returned, 0); |
7ee1af76 JA |
783 | } |
784 | ||
785 | int | |
96daf2b0 | 786 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
787 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
788 | int *pbytes_returned) | |
789 | { | |
790 | int rc = 0; | |
791 | int rstart = 0; | |
7ee1af76 | 792 | struct mid_q_entry *midQ; |
96daf2b0 | 793 | struct cifs_ses *ses; |
7ee1af76 JA |
794 | |
795 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 796 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
797 | return -EIO; |
798 | } | |
799 | ses = tcon->ses; | |
800 | ||
79a58d1f | 801 | if (ses->server == NULL) { |
b6b38f70 | 802 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
803 | return -EIO; |
804 | } | |
805 | ||
79a58d1f | 806 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
807 | return -ENOENT; |
808 | ||
79a58d1f | 809 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
810 | to the same server. We may make this configurable later or |
811 | use ses->maxReq */ | |
812 | ||
be8e3b00 SF |
813 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
814 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 815 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 816 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
817 | return -EIO; |
818 | } | |
819 | ||
c5797a94 | 820 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
821 | if (rc) |
822 | return rc; | |
823 | ||
79a58d1f | 824 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
825 | and avoid races inside tcp sendmsg code that could cause corruption |
826 | of smb data */ | |
827 | ||
72ca545b | 828 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
829 | |
830 | rc = allocate_mid(ses, in_buf, &midQ); | |
831 | if (rc) { | |
72ca545b | 832 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
833 | return rc; |
834 | } | |
835 | ||
7ee1af76 | 836 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 837 | if (rc) { |
ddc8cf8f | 838 | delete_mid(midQ); |
829049cb VL |
839 | mutex_unlock(&ses->server->srv_mutex); |
840 | return rc; | |
841 | } | |
1da177e4 | 842 | |
7ee1af76 JA |
843 | midQ->midState = MID_REQUEST_SUBMITTED; |
844 | #ifdef CONFIG_CIFS_STATS2 | |
845 | atomic_inc(&ses->server->inSend); | |
846 | #endif | |
be8e3b00 | 847 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
7ee1af76 JA |
848 | #ifdef CONFIG_CIFS_STATS2 |
849 | atomic_dec(&ses->server->inSend); | |
850 | midQ->when_sent = jiffies; | |
851 | #endif | |
72ca545b | 852 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 853 | |
79a58d1f | 854 | if (rc < 0) { |
ddc8cf8f | 855 | delete_mid(midQ); |
7ee1af76 JA |
856 | return rc; |
857 | } | |
858 | ||
859 | /* Wait for a reply - allow signals to interrupt. */ | |
860 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 861 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
862 | ((ses->server->tcpStatus != CifsGood) && |
863 | (ses->server->tcpStatus != CifsNew))); | |
864 | ||
865 | /* Were we interrupted by a signal ? */ | |
866 | if ((rc == -ERESTARTSYS) && | |
867 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
868 | ((ses->server->tcpStatus == CifsGood) || | |
869 | (ses->server->tcpStatus == CifsNew))) { | |
870 | ||
871 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
872 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
873 | blocking lock to return. */ | |
76dcc26f | 874 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 875 | if (rc) { |
ddc8cf8f | 876 | delete_mid(midQ); |
7ee1af76 JA |
877 | return rc; |
878 | } | |
879 | } else { | |
880 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
881 | to cause the blocking lock to return. */ | |
882 | ||
883 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
884 | ||
885 | /* If we get -ENOLCK back the lock may have | |
886 | already been removed. Don't exit in this case. */ | |
887 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 888 | delete_mid(midQ); |
7ee1af76 JA |
889 | return rc; |
890 | } | |
891 | } | |
892 | ||
1be912dd JL |
893 | rc = wait_for_response(ses->server, midQ); |
894 | if (rc) { | |
2db7c581 | 895 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
896 | spin_lock(&GlobalMid_Lock); |
897 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
898 | /* no longer considered to be "in-flight" */ | |
899 | midQ->callback = DeleteMidQEntry; | |
900 | spin_unlock(&GlobalMid_Lock); | |
901 | return rc; | |
902 | } | |
903 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 904 | } |
1be912dd JL |
905 | |
906 | /* We got the response - restart system call. */ | |
907 | rstart = 1; | |
7ee1af76 JA |
908 | } |
909 | ||
3c1105df | 910 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 911 | if (rc != 0) |
7ee1af76 | 912 | return rc; |
50c2f753 | 913 | |
17c8bfed | 914 | /* rcvd frame is ok */ |
2c8f981d | 915 | if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) { |
698e96a8 | 916 | rc = -EIO; |
b6b38f70 | 917 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
918 | goto out; |
919 | } | |
1da177e4 | 920 | |
2c8f981d JL |
921 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
922 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
923 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 924 | out: |
ddc8cf8f | 925 | delete_mid(midQ); |
7ee1af76 JA |
926 | if (rstart && rc == -EACCES) |
927 | return -ERESTARTSYS; | |
1da177e4 LT |
928 | return rc; |
929 | } |