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); |
789e6661 | 269 | cifs_num_waiters_inc(server); |
c5797a94 JL |
270 | wait_event(server->request_q, |
271 | atomic_read(&server->inFlight) | |
27a97a61 | 272 | < cifs_max_pending); |
789e6661 | 273 | cifs_num_waiters_dec(server); |
27a97a61 VL |
274 | spin_lock(&GlobalMid_Lock); |
275 | } else { | |
c5797a94 | 276 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 277 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 278 | return -ENOENT; |
1da177e4 | 279 | } |
27a97a61 VL |
280 | |
281 | /* can not count locking commands against total | |
282 | as they are allowed to block on server */ | |
283 | ||
284 | /* update # of requests on the wire to server */ | |
285 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 286 | atomic_inc(&server->inFlight); |
27a97a61 VL |
287 | spin_unlock(&GlobalMid_Lock); |
288 | break; | |
1da177e4 LT |
289 | } |
290 | } | |
7ee1af76 JA |
291 | return 0; |
292 | } | |
1da177e4 | 293 | |
96daf2b0 | 294 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
295 | struct mid_q_entry **ppmidQ) |
296 | { | |
1da177e4 | 297 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 298 | return -ENOENT; |
8fbbd365 VL |
299 | } |
300 | ||
301 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 302 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 303 | return -EAGAIN; |
8fbbd365 VL |
304 | } |
305 | ||
306 | if (ses->status != CifsGood) { | |
1da177e4 | 307 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 308 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 309 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 310 | return -EAGAIN; |
ad7a2926 | 311 | /* else ok - we are setting up session */ |
1da177e4 | 312 | } |
24b9b06b | 313 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 314 | if (*ppmidQ == NULL) |
7ee1af76 | 315 | return -ENOMEM; |
ddc8cf8f JL |
316 | spin_lock(&GlobalMid_Lock); |
317 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
318 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
319 | return 0; |
320 | } | |
321 | ||
0ade640e JL |
322 | static int |
323 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 324 | { |
0ade640e | 325 | int error; |
7ee1af76 | 326 | |
0ade640e JL |
327 | error = wait_event_killable(server->response_q, |
328 | midQ->midState != MID_REQUEST_SUBMITTED); | |
329 | if (error < 0) | |
330 | return -ERESTARTSYS; | |
7ee1af76 | 331 | |
0ade640e | 332 | return 0; |
7ee1af76 JA |
333 | } |
334 | ||
133672ef | 335 | |
a6827c18 JL |
336 | /* |
337 | * Send a SMB request and set the callback function in the mid to handle | |
338 | * the result. Caller is responsible for dealing with timeouts. | |
339 | */ | |
340 | int | |
fcc31cb6 | 341 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
59ffd841 JL |
342 | unsigned int nvec, mid_callback_t *callback, void *cbdata, |
343 | bool ignore_pend) | |
a6827c18 JL |
344 | { |
345 | int rc; | |
346 | struct mid_q_entry *mid; | |
fcc31cb6 | 347 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
a6827c18 | 348 | |
59ffd841 | 349 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
350 | if (rc) |
351 | return rc; | |
352 | ||
e3f0dadb | 353 | /* enable signing if server requires it */ |
96daf2b0 | 354 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
fcc31cb6 | 355 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
e3f0dadb | 356 | |
a6827c18 | 357 | mutex_lock(&server->srv_mutex); |
fcc31cb6 | 358 | mid = AllocMidQEntry(hdr, server); |
a6827c18 JL |
359 | if (mid == NULL) { |
360 | mutex_unlock(&server->srv_mutex); | |
0193e072 PS |
361 | atomic_dec(&server->inFlight); |
362 | wake_up(&server->request_q); | |
a6827c18 JL |
363 | return -ENOMEM; |
364 | } | |
365 | ||
366 | /* put it on the pending_mid_q */ | |
367 | spin_lock(&GlobalMid_Lock); | |
368 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
369 | spin_unlock(&GlobalMid_Lock); | |
370 | ||
fcc31cb6 | 371 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); |
a6827c18 JL |
372 | if (rc) { |
373 | mutex_unlock(&server->srv_mutex); | |
374 | goto out_err; | |
375 | } | |
376 | ||
377 | mid->callback = callback; | |
378 | mid->callback_data = cbdata; | |
379 | mid->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
380 | |
381 | cifs_in_send_inc(server); | |
fcc31cb6 | 382 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
383 | cifs_in_send_dec(server); |
384 | cifs_save_when_sent(mid); | |
a6827c18 | 385 | mutex_unlock(&server->srv_mutex); |
789e6661 | 386 | |
a6827c18 JL |
387 | if (rc) |
388 | goto out_err; | |
389 | ||
390 | return rc; | |
391 | out_err: | |
392 | delete_mid(mid); | |
393 | atomic_dec(&server->inFlight); | |
394 | wake_up(&server->request_q); | |
395 | return rc; | |
396 | } | |
397 | ||
133672ef SF |
398 | /* |
399 | * | |
400 | * Send an SMB Request. No response info (other than return code) | |
401 | * needs to be parsed. | |
402 | * | |
403 | * flags indicate the type of request buffer and how long to wait | |
404 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
405 | * | |
406 | */ | |
407 | int | |
96daf2b0 | 408 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
133672ef SF |
409 | struct smb_hdr *in_buf, int flags) |
410 | { | |
411 | int rc; | |
412 | struct kvec iov[1]; | |
413 | int resp_buf_type; | |
414 | ||
415 | iov[0].iov_base = (char *)in_buf; | |
be8e3b00 | 416 | iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4; |
133672ef SF |
417 | flags |= CIFS_NO_RESP; |
418 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 419 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 420 | |
133672ef SF |
421 | return rc; |
422 | } | |
423 | ||
053d5034 | 424 | static int |
3c1105df | 425 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
426 | { |
427 | int rc = 0; | |
428 | ||
74dd92a8 JL |
429 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
430 | mid->mid, mid->midState); | |
053d5034 | 431 | |
74dd92a8 JL |
432 | spin_lock(&GlobalMid_Lock); |
433 | switch (mid->midState) { | |
434 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
435 | spin_unlock(&GlobalMid_Lock); |
436 | return rc; | |
74dd92a8 JL |
437 | case MID_RETRY_NEEDED: |
438 | rc = -EAGAIN; | |
439 | break; | |
71823baf JL |
440 | case MID_RESPONSE_MALFORMED: |
441 | rc = -EIO; | |
442 | break; | |
3c1105df JL |
443 | case MID_SHUTDOWN: |
444 | rc = -EHOSTDOWN; | |
445 | break; | |
74dd92a8 | 446 | default: |
3c1105df | 447 | list_del_init(&mid->qhead); |
74dd92a8 JL |
448 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, |
449 | mid->mid, mid->midState); | |
450 | rc = -EIO; | |
053d5034 JL |
451 | } |
452 | spin_unlock(&GlobalMid_Lock); | |
453 | ||
2b84a36c | 454 | DeleteMidQEntry(mid); |
053d5034 JL |
455 | return rc; |
456 | } | |
457 | ||
76dcc26f JL |
458 | /* |
459 | * An NT cancel request header looks just like the original request except: | |
460 | * | |
461 | * The Command is SMB_COM_NT_CANCEL | |
462 | * The WordCount is zeroed out | |
463 | * The ByteCount is zeroed out | |
464 | * | |
465 | * This function mangles an existing request buffer into a | |
466 | * SMB_COM_NT_CANCEL request and then sends it. | |
467 | */ | |
468 | static int | |
469 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
470 | struct mid_q_entry *mid) | |
471 | { | |
472 | int rc = 0; | |
473 | ||
474 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 475 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
476 | in_buf->Command = SMB_COM_NT_CANCEL; |
477 | in_buf->WordCount = 0; | |
820a803f | 478 | put_bcc(0, in_buf); |
76dcc26f JL |
479 | |
480 | mutex_lock(&server->srv_mutex); | |
481 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
482 | if (rc) { | |
483 | mutex_unlock(&server->srv_mutex); | |
484 | return rc; | |
485 | } | |
be8e3b00 | 486 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
487 | mutex_unlock(&server->srv_mutex); |
488 | ||
489 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
490 | in_buf->Mid, rc); | |
491 | ||
492 | return rc; | |
493 | } | |
494 | ||
2c8f981d JL |
495 | int |
496 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
497 | bool log_error) | |
498 | { | |
826a95e4 JL |
499 | unsigned int len = be32_to_cpu(mid->resp_buf->smb_buf_length) + 4; |
500 | ||
501 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
502 | |
503 | /* convert the length into a more usable form */ | |
96daf2b0 | 504 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
505 | struct kvec iov; |
506 | ||
507 | iov.iov_base = mid->resp_buf; | |
508 | iov.iov_len = len; | |
2c8f981d | 509 | /* FIXME: add code to kill session */ |
826a95e4 | 510 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
511 | mid->sequence_number + 1) != 0) |
512 | cERROR(1, "Unexpected SMB signature"); | |
513 | } | |
514 | ||
515 | /* BB special case reconnect tid and uid here? */ | |
516 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
517 | } | |
518 | ||
7ee1af76 | 519 | int |
96daf2b0 | 520 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 521 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 522 | const int flags) |
7ee1af76 JA |
523 | { |
524 | int rc = 0; | |
133672ef | 525 | int long_op; |
7ee1af76 JA |
526 | struct mid_q_entry *midQ; |
527 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 528 | |
133672ef SF |
529 | long_op = flags & CIFS_TIMEOUT_MASK; |
530 | ||
7ee1af76 JA |
531 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
532 | ||
533 | if ((ses == NULL) || (ses->server == NULL)) { | |
534 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 535 | cERROR(1, "Null session"); |
7ee1af76 JA |
536 | return -EIO; |
537 | } | |
538 | ||
79a58d1f | 539 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
540 | cifs_small_buf_release(in_buf); |
541 | return -ENOENT; | |
542 | } | |
543 | ||
79a58d1f | 544 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
545 | to the same server. We may make this configurable later or |
546 | use ses->maxReq */ | |
547 | ||
c5797a94 | 548 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
549 | if (rc) { |
550 | cifs_small_buf_release(in_buf); | |
551 | return rc; | |
552 | } | |
553 | ||
79a58d1f | 554 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
555 | and avoid races inside tcp sendmsg code that could cause corruption |
556 | of smb data */ | |
557 | ||
72ca545b | 558 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
559 | |
560 | rc = allocate_mid(ses, in_buf, &midQ); | |
561 | if (rc) { | |
72ca545b | 562 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 563 | cifs_small_buf_release(in_buf); |
7ee1af76 | 564 | /* Update # of requests on wire to server */ |
79a58d1f | 565 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
566 | wake_up(&ses->server->request_q); |
567 | return rc; | |
1da177e4 | 568 | } |
79a58d1f | 569 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
570 | if (rc) { |
571 | mutex_unlock(&ses->server->srv_mutex); | |
572 | cifs_small_buf_release(in_buf); | |
573 | goto out; | |
574 | } | |
1da177e4 LT |
575 | |
576 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 | 577 | cifs_in_send_inc(ses->server); |
0496e02d | 578 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
579 | cifs_in_send_dec(ses->server); |
580 | cifs_save_when_sent(midQ); | |
7ee1af76 | 581 | |
72ca545b | 582 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 583 | |
2db7c581 JL |
584 | if (rc < 0) { |
585 | cifs_small_buf_release(in_buf); | |
7ee1af76 | 586 | goto out; |
2db7c581 | 587 | } |
4b8f930f | 588 | |
2db7c581 JL |
589 | if (long_op == CIFS_ASYNC_OP) { |
590 | cifs_small_buf_release(in_buf); | |
133672ef | 591 | goto out; |
2db7c581 | 592 | } |
d6e04ae6 | 593 | |
0ade640e | 594 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 595 | if (rc != 0) { |
2db7c581 | 596 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
597 | spin_lock(&GlobalMid_Lock); |
598 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
599 | midQ->callback = DeleteMidQEntry; | |
600 | spin_unlock(&GlobalMid_Lock); | |
2db7c581 | 601 | cifs_small_buf_release(in_buf); |
1be912dd JL |
602 | atomic_dec(&ses->server->inFlight); |
603 | wake_up(&ses->server->request_q); | |
604 | return rc; | |
605 | } | |
606 | spin_unlock(&GlobalMid_Lock); | |
607 | } | |
d6e04ae6 | 608 | |
2db7c581 JL |
609 | cifs_small_buf_release(in_buf); |
610 | ||
3c1105df | 611 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 612 | if (rc != 0) { |
79a58d1f | 613 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 614 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
615 | return rc; |
616 | } | |
50c2f753 | 617 | |
2c8f981d | 618 | if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 619 | rc = -EIO; |
2c8f981d | 620 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
621 | goto out; |
622 | } | |
623 | ||
2c8f981d JL |
624 | iov[0].iov_base = (char *)midQ->resp_buf; |
625 | iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; | |
626 | if (midQ->largeBuf) | |
627 | *pRespBufType = CIFS_LARGE_BUFFER; | |
628 | else | |
629 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 630 | |
2c8f981d | 631 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 632 | |
2c8f981d JL |
633 | /* mark it so buf will not be freed by delete_mid */ |
634 | if ((flags & CIFS_NO_RESP) == 0) | |
635 | midQ->resp_buf = NULL; | |
7ee1af76 | 636 | out: |
ddc8cf8f | 637 | delete_mid(midQ); |
79a58d1f | 638 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 639 | wake_up(&ses->server->request_q); |
1da177e4 | 640 | |
d6e04ae6 SF |
641 | return rc; |
642 | } | |
1da177e4 LT |
643 | |
644 | int | |
96daf2b0 | 645 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
646 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
647 | int *pbytes_returned, const int long_op) | |
648 | { | |
649 | int rc = 0; | |
1da177e4 LT |
650 | struct mid_q_entry *midQ; |
651 | ||
652 | if (ses == NULL) { | |
b6b38f70 | 653 | cERROR(1, "Null smb session"); |
1da177e4 LT |
654 | return -EIO; |
655 | } | |
79a58d1f | 656 | if (ses->server == NULL) { |
b6b38f70 | 657 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
658 | return -EIO; |
659 | } | |
660 | ||
79a58d1f | 661 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
662 | return -ENOENT; |
663 | ||
79a58d1f | 664 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
665 | to the same server. We may make this configurable later or |
666 | use ses->maxReq */ | |
1da177e4 | 667 | |
be8e3b00 SF |
668 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
669 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 670 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 671 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
672 | return -EIO; |
673 | } | |
674 | ||
c5797a94 | 675 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
676 | if (rc) |
677 | return rc; | |
678 | ||
79a58d1f | 679 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
680 | and avoid races inside tcp sendmsg code that could cause corruption |
681 | of smb data */ | |
682 | ||
72ca545b | 683 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 684 | |
7ee1af76 JA |
685 | rc = allocate_mid(ses, in_buf, &midQ); |
686 | if (rc) { | |
72ca545b | 687 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 688 | /* Update # of requests on wire to server */ |
79a58d1f | 689 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
690 | wake_up(&ses->server->request_q); |
691 | return rc; | |
1da177e4 LT |
692 | } |
693 | ||
ad009ac9 | 694 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
695 | if (rc) { |
696 | mutex_unlock(&ses->server->srv_mutex); | |
697 | goto out; | |
698 | } | |
1da177e4 LT |
699 | |
700 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
701 | |
702 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 703 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
704 | cifs_in_send_dec(ses->server); |
705 | cifs_save_when_sent(midQ); | |
72ca545b | 706 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 707 | |
79a58d1f | 708 | if (rc < 0) |
7ee1af76 JA |
709 | goto out; |
710 | ||
0ade640e | 711 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 712 | goto out; |
1da177e4 | 713 | |
0ade640e | 714 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 715 | if (rc != 0) { |
2db7c581 | 716 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
717 | spin_lock(&GlobalMid_Lock); |
718 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
719 | /* no longer considered to be "in-flight" */ | |
720 | midQ->callback = DeleteMidQEntry; | |
721 | spin_unlock(&GlobalMid_Lock); | |
722 | atomic_dec(&ses->server->inFlight); | |
723 | wake_up(&ses->server->request_q); | |
724 | return rc; | |
725 | } | |
726 | spin_unlock(&GlobalMid_Lock); | |
727 | } | |
1da177e4 | 728 | |
3c1105df | 729 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 730 | if (rc != 0) { |
79a58d1f | 731 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 732 | wake_up(&ses->server->request_q); |
1da177e4 LT |
733 | return rc; |
734 | } | |
50c2f753 | 735 | |
2c8f981d JL |
736 | if (!midQ->resp_buf || !out_buf || |
737 | midQ->midState != MID_RESPONSE_RECEIVED) { | |
2b2bdfba | 738 | rc = -EIO; |
b6b38f70 | 739 | cERROR(1, "Bad MID state?"); |
2c8f981d | 740 | goto out; |
1da177e4 | 741 | } |
7ee1af76 | 742 | |
2c8f981d JL |
743 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
744 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
745 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 746 | out: |
ddc8cf8f | 747 | delete_mid(midQ); |
79a58d1f | 748 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 749 | wake_up(&ses->server->request_q); |
1da177e4 | 750 | |
7ee1af76 JA |
751 | return rc; |
752 | } | |
1da177e4 | 753 | |
7ee1af76 JA |
754 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
755 | blocking lock to return. */ | |
756 | ||
757 | static int | |
96daf2b0 | 758 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
759 | struct smb_hdr *in_buf, |
760 | struct smb_hdr *out_buf) | |
761 | { | |
762 | int bytes_returned; | |
96daf2b0 | 763 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
764 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
765 | ||
766 | /* We just modify the current in_buf to change | |
767 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
768 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
769 | LOCKING_ANDX_CANCEL_LOCK. */ | |
770 | ||
771 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
772 | pSMB->Timeout = 0; | |
773 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
774 | ||
775 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 776 | &bytes_returned, 0); |
7ee1af76 JA |
777 | } |
778 | ||
779 | int | |
96daf2b0 | 780 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
781 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
782 | int *pbytes_returned) | |
783 | { | |
784 | int rc = 0; | |
785 | int rstart = 0; | |
7ee1af76 | 786 | struct mid_q_entry *midQ; |
96daf2b0 | 787 | struct cifs_ses *ses; |
7ee1af76 JA |
788 | |
789 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 790 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
791 | return -EIO; |
792 | } | |
793 | ses = tcon->ses; | |
794 | ||
79a58d1f | 795 | if (ses->server == NULL) { |
b6b38f70 | 796 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
797 | return -EIO; |
798 | } | |
799 | ||
79a58d1f | 800 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
801 | return -ENOENT; |
802 | ||
79a58d1f | 803 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
804 | to the same server. We may make this configurable later or |
805 | use ses->maxReq */ | |
806 | ||
be8e3b00 SF |
807 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
808 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 809 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 810 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
811 | return -EIO; |
812 | } | |
813 | ||
c5797a94 | 814 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
815 | if (rc) |
816 | return rc; | |
817 | ||
79a58d1f | 818 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
819 | and avoid races inside tcp sendmsg code that could cause corruption |
820 | of smb data */ | |
821 | ||
72ca545b | 822 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
823 | |
824 | rc = allocate_mid(ses, in_buf, &midQ); | |
825 | if (rc) { | |
72ca545b | 826 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
827 | return rc; |
828 | } | |
829 | ||
7ee1af76 | 830 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 831 | if (rc) { |
ddc8cf8f | 832 | delete_mid(midQ); |
829049cb VL |
833 | mutex_unlock(&ses->server->srv_mutex); |
834 | return rc; | |
835 | } | |
1da177e4 | 836 | |
7ee1af76 | 837 | midQ->midState = MID_REQUEST_SUBMITTED; |
789e6661 | 838 | cifs_in_send_inc(ses->server); |
be8e3b00 | 839 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
840 | cifs_in_send_dec(ses->server); |
841 | cifs_save_when_sent(midQ); | |
72ca545b | 842 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 843 | |
79a58d1f | 844 | if (rc < 0) { |
ddc8cf8f | 845 | delete_mid(midQ); |
7ee1af76 JA |
846 | return rc; |
847 | } | |
848 | ||
849 | /* Wait for a reply - allow signals to interrupt. */ | |
850 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 851 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
852 | ((ses->server->tcpStatus != CifsGood) && |
853 | (ses->server->tcpStatus != CifsNew))); | |
854 | ||
855 | /* Were we interrupted by a signal ? */ | |
856 | if ((rc == -ERESTARTSYS) && | |
857 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
858 | ((ses->server->tcpStatus == CifsGood) || | |
859 | (ses->server->tcpStatus == CifsNew))) { | |
860 | ||
861 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
862 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
863 | blocking lock to return. */ | |
76dcc26f | 864 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 865 | if (rc) { |
ddc8cf8f | 866 | delete_mid(midQ); |
7ee1af76 JA |
867 | return rc; |
868 | } | |
869 | } else { | |
870 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
871 | to cause the blocking lock to return. */ | |
872 | ||
873 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
874 | ||
875 | /* If we get -ENOLCK back the lock may have | |
876 | already been removed. Don't exit in this case. */ | |
877 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 878 | delete_mid(midQ); |
7ee1af76 JA |
879 | return rc; |
880 | } | |
881 | } | |
882 | ||
1be912dd JL |
883 | rc = wait_for_response(ses->server, midQ); |
884 | if (rc) { | |
2db7c581 | 885 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
886 | spin_lock(&GlobalMid_Lock); |
887 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
888 | /* no longer considered to be "in-flight" */ | |
889 | midQ->callback = DeleteMidQEntry; | |
890 | spin_unlock(&GlobalMid_Lock); | |
891 | return rc; | |
892 | } | |
893 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 894 | } |
1be912dd JL |
895 | |
896 | /* We got the response - restart system call. */ | |
897 | rstart = 1; | |
7ee1af76 JA |
898 | } |
899 | ||
3c1105df | 900 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 901 | if (rc != 0) |
7ee1af76 | 902 | return rc; |
50c2f753 | 903 | |
17c8bfed | 904 | /* rcvd frame is ok */ |
2c8f981d | 905 | if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) { |
698e96a8 | 906 | rc = -EIO; |
b6b38f70 | 907 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
908 | goto out; |
909 | } | |
1da177e4 | 910 | |
2c8f981d JL |
911 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
912 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
913 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 914 | out: |
ddc8cf8f | 915 | delete_mid(midQ); |
7ee1af76 JA |
916 | if (rstart && rc == -EACCES) |
917 | return -ERESTARTSYS; | |
1da177e4 LT |
918 | return rc; |
919 | } |