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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "cifspdu.h" | |
34 | #include "cifsglob.h" | |
35 | #include "cifsproto.h" | |
36 | #include "cifs_debug.h" | |
50c2f753 | 37 | |
1da177e4 | 38 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 39 | |
2b84a36c JL |
40 | static void |
41 | wake_up_task(struct mid_q_entry *mid) | |
42 | { | |
43 | wake_up_process(mid->callback_data); | |
44 | } | |
45 | ||
a6827c18 | 46 | struct mid_q_entry * |
24b9b06b | 47 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
48 | { |
49 | struct mid_q_entry *temp; | |
50 | ||
24b9b06b | 51 | if (server == NULL) { |
b6b38f70 | 52 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
53 | return NULL; |
54 | } | |
50c2f753 | 55 | |
232087cb | 56 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
57 | if (temp == NULL) |
58 | return temp; | |
59 | else { | |
26f57364 | 60 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
61 | temp->mid = smb_buffer->Mid; /* always LE */ |
62 | temp->pid = current->pid; | |
63 | temp->command = smb_buffer->Command; | |
b6b38f70 | 64 | cFYI(1, "For smb_command %d", temp->command); |
1047abc1 SF |
65 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
66 | /* when mid allocated can be before when sent */ | |
67 | temp->when_alloc = jiffies; | |
2b84a36c JL |
68 | |
69 | /* | |
70 | * The default is for the mid to be synchronous, so the | |
71 | * default callback just wakes up the current task. | |
72 | */ | |
73 | temp->callback = wake_up_task; | |
74 | temp->callback_data = current; | |
1da177e4 LT |
75 | } |
76 | ||
1da177e4 LT |
77 | atomic_inc(&midCount); |
78 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
79 | return temp; |
80 | } | |
81 | ||
766fdbb5 | 82 | void |
1da177e4 LT |
83 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
84 | { | |
1047abc1 SF |
85 | #ifdef CONFIG_CIFS_STATS2 |
86 | unsigned long now; | |
87 | #endif | |
1da177e4 | 88 | midEntry->midState = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
79a58d1f | 90 | if (midEntry->largeBuf) |
b8643e1b SF |
91 | cifs_buf_release(midEntry->resp_buf); |
92 | else | |
93 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
94 | #ifdef CONFIG_CIFS_STATS2 |
95 | now = jiffies; | |
96 | /* commands taking longer than one second are indications that | |
97 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
98 | if ((now - midEntry->when_alloc) > HZ) { |
99 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
100 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
101 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
102 | midEntry->command, midEntry->mid); | |
103 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
104 | now - midEntry->when_alloc, | |
105 | now - midEntry->when_sent, | |
106 | now - midEntry->when_received); | |
107 | } | |
108 | } | |
109 | #endif | |
1da177e4 LT |
110 | mempool_free(midEntry, cifs_mid_poolp); |
111 | } | |
112 | ||
ddc8cf8f JL |
113 | static void |
114 | delete_mid(struct mid_q_entry *mid) | |
115 | { | |
116 | spin_lock(&GlobalMid_Lock); | |
117 | list_del(&mid->qhead); | |
118 | spin_unlock(&GlobalMid_Lock); | |
119 | ||
120 | DeleteMidQEntry(mid); | |
121 | } | |
122 | ||
d6e04ae6 | 123 | static int |
0496e02d | 124 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
125 | { |
126 | int rc = 0; | |
127 | int i = 0; | |
128 | struct msghdr smb_msg; | |
3e84469d SF |
129 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
130 | unsigned int len = iov[0].iov_len; | |
131 | unsigned int total_len; | |
132 | int first_vec = 0; | |
be8e3b00 | 133 | unsigned int smb_buf_length = be32_to_cpu(smb_buffer->smb_buf_length); |
edf1ae40 | 134 | struct socket *ssocket = server->ssocket; |
50c2f753 | 135 | |
79a58d1f | 136 | if (ssocket == NULL) |
1da177e4 | 137 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 138 | |
a9f1b85e | 139 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 140 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
141 | smb_msg.msg_control = NULL; |
142 | smb_msg.msg_controllen = 0; | |
0496e02d | 143 | if (server->noblocksnd) |
edf1ae40 SF |
144 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
145 | else | |
146 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 147 | |
3e84469d SF |
148 | total_len = 0; |
149 | for (i = 0; i < n_vec; i++) | |
150 | total_len += iov[i].iov_len; | |
151 | ||
b6b38f70 | 152 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
153 | dump_smb(smb_buffer, len); |
154 | ||
17680356 | 155 | i = 0; |
3e84469d SF |
156 | while (total_len) { |
157 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
158 | n_vec - first_vec, total_len); | |
1da177e4 LT |
159 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
160 | i++; | |
da505c38 SF |
161 | /* if blocking send we try 3 times, since each can block |
162 | for 5 seconds. For nonblocking we have to try more | |
163 | but wait increasing amounts of time allowing time for | |
164 | socket to clear. The overall time we wait in either | |
165 | case to send on the socket is about 15 seconds. | |
166 | Similarly we wait for 15 seconds for | |
167 | a response from the server in SendReceive[2] | |
168 | for the server to send a response back for | |
169 | most types of requests (except SMB Write | |
170 | past end of file which can be slow, and | |
171 | blocking lock operations). NFS waits slightly longer | |
172 | than CIFS, but this can make it take longer for | |
173 | nonresponsive servers to be detected and 15 seconds | |
174 | is more than enough time for modern networks to | |
175 | send a packet. In most cases if we fail to send | |
176 | after the retries we will kill the socket and | |
177 | reconnect which may clear the network problem. | |
178 | */ | |
179 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
180 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
181 | ssocket); | |
1da177e4 LT |
182 | rc = -EAGAIN; |
183 | break; | |
184 | } | |
68058e75 | 185 | msleep(1 << i); |
1da177e4 LT |
186 | continue; |
187 | } | |
79a58d1f | 188 | if (rc < 0) |
1da177e4 | 189 | break; |
3e84469d | 190 | |
61de800d SF |
191 | if (rc == total_len) { |
192 | total_len = 0; | |
193 | break; | |
194 | } else if (rc > total_len) { | |
b6b38f70 | 195 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
196 | break; |
197 | } | |
79a58d1f | 198 | if (rc == 0) { |
3e84469d SF |
199 | /* should never happen, letting socket clear before |
200 | retrying is our only obvious option here */ | |
b6b38f70 | 201 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
202 | msleep(500); |
203 | continue; | |
d6e04ae6 | 204 | } |
3e84469d | 205 | total_len -= rc; |
68058e75 | 206 | /* the line below resets i */ |
3e84469d SF |
207 | for (i = first_vec; i < n_vec; i++) { |
208 | if (iov[i].iov_len) { | |
209 | if (rc > iov[i].iov_len) { | |
210 | rc -= iov[i].iov_len; | |
211 | iov[i].iov_len = 0; | |
212 | } else { | |
213 | iov[i].iov_base += rc; | |
214 | iov[i].iov_len -= rc; | |
215 | first_vec = i; | |
216 | break; | |
217 | } | |
218 | } | |
d6e04ae6 | 219 | } |
5e1253b5 | 220 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
221 | } |
222 | ||
edf1ae40 | 223 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
224 | cFYI(1, "partial send (%d remaining), terminating session", |
225 | total_len); | |
edf1ae40 SF |
226 | /* If we have only sent part of an SMB then the next SMB |
227 | could be taken as the remainder of this one. We need | |
228 | to kill the socket so the server throws away the partial | |
229 | SMB */ | |
230 | server->tcpStatus = CifsNeedReconnect; | |
231 | } | |
232 | ||
d804d41d | 233 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 234 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 235 | else |
1da177e4 | 236 | rc = 0; |
1da177e4 | 237 | |
7ee1af76 JA |
238 | /* Don't want to modify the buffer as a |
239 | side effect of this call. */ | |
be8e3b00 | 240 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buf_length); |
7ee1af76 | 241 | |
1da177e4 LT |
242 | return rc; |
243 | } | |
244 | ||
0496e02d JL |
245 | int |
246 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
247 | unsigned int smb_buf_length) | |
248 | { | |
249 | struct kvec iov; | |
250 | ||
251 | iov.iov_base = smb_buffer; | |
252 | iov.iov_len = smb_buf_length + 4; | |
253 | ||
254 | return smb_sendv(server, &iov, 1); | |
255 | } | |
256 | ||
fc40f9cf PS |
257 | static int |
258 | wait_for_free_request(struct TCP_Server_Info *server, const int long_op) | |
1da177e4 | 259 | { |
5bc59498 PS |
260 | int rc; |
261 | ||
fc40f9cf PS |
262 | spin_lock(&server->req_lock); |
263 | ||
133672ef | 264 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 265 | /* oplock breaks must not be held up */ |
fc40f9cf | 266 | server->in_flight++; |
2d86dbc9 | 267 | server->credits--; |
fc40f9cf | 268 | spin_unlock(&server->req_lock); |
27a97a61 VL |
269 | return 0; |
270 | } | |
271 | ||
27a97a61 | 272 | while (1) { |
2d86dbc9 | 273 | if (server->credits <= 0) { |
fc40f9cf | 274 | spin_unlock(&server->req_lock); |
789e6661 | 275 | cifs_num_waiters_inc(server); |
5bc59498 PS |
276 | rc = wait_event_killable(server->request_q, |
277 | has_credits(server)); | |
789e6661 | 278 | cifs_num_waiters_dec(server); |
5bc59498 PS |
279 | if (rc) |
280 | return rc; | |
fc40f9cf | 281 | spin_lock(&server->req_lock); |
27a97a61 | 282 | } else { |
c5797a94 | 283 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 284 | spin_unlock(&server->req_lock); |
27a97a61 | 285 | return -ENOENT; |
1da177e4 | 286 | } |
27a97a61 | 287 | |
2d86dbc9 PS |
288 | /* |
289 | * Can not count locking commands against total | |
290 | * as they are allowed to block on server. | |
291 | */ | |
27a97a61 VL |
292 | |
293 | /* update # of requests on the wire to server */ | |
2d86dbc9 PS |
294 | if (long_op != CIFS_BLOCKING_OP) { |
295 | server->credits--; | |
fc40f9cf | 296 | server->in_flight++; |
2d86dbc9 | 297 | } |
fc40f9cf | 298 | spin_unlock(&server->req_lock); |
27a97a61 | 299 | break; |
1da177e4 LT |
300 | } |
301 | } | |
7ee1af76 JA |
302 | return 0; |
303 | } | |
1da177e4 | 304 | |
96daf2b0 | 305 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
306 | struct mid_q_entry **ppmidQ) |
307 | { | |
1da177e4 | 308 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 309 | return -ENOENT; |
8fbbd365 VL |
310 | } |
311 | ||
312 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 313 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 314 | return -EAGAIN; |
8fbbd365 VL |
315 | } |
316 | ||
317 | if (ses->status != CifsGood) { | |
1da177e4 | 318 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 319 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 320 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 321 | return -EAGAIN; |
ad7a2926 | 322 | /* else ok - we are setting up session */ |
1da177e4 | 323 | } |
24b9b06b | 324 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 325 | if (*ppmidQ == NULL) |
7ee1af76 | 326 | return -ENOMEM; |
ddc8cf8f JL |
327 | spin_lock(&GlobalMid_Lock); |
328 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
329 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
330 | return 0; |
331 | } | |
332 | ||
0ade640e JL |
333 | static int |
334 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 335 | { |
0ade640e | 336 | int error; |
7ee1af76 | 337 | |
f06ac72e | 338 | error = wait_event_freezekillable(server->response_q, |
0ade640e JL |
339 | midQ->midState != MID_REQUEST_SUBMITTED); |
340 | if (error < 0) | |
341 | return -ERESTARTSYS; | |
7ee1af76 | 342 | |
0ade640e | 343 | return 0; |
7ee1af76 JA |
344 | } |
345 | ||
133672ef | 346 | |
a6827c18 JL |
347 | /* |
348 | * Send a SMB request and set the callback function in the mid to handle | |
349 | * the result. Caller is responsible for dealing with timeouts. | |
350 | */ | |
351 | int | |
fcc31cb6 | 352 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 JL |
353 | unsigned int nvec, mid_receive_t *receive, |
354 | mid_callback_t *callback, void *cbdata, bool ignore_pend) | |
a6827c18 JL |
355 | { |
356 | int rc; | |
357 | struct mid_q_entry *mid; | |
fcc31cb6 | 358 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
a6827c18 | 359 | |
59ffd841 | 360 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
361 | if (rc) |
362 | return rc; | |
363 | ||
e3f0dadb | 364 | /* enable signing if server requires it */ |
96daf2b0 | 365 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
fcc31cb6 | 366 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
e3f0dadb | 367 | |
a6827c18 | 368 | mutex_lock(&server->srv_mutex); |
fcc31cb6 | 369 | mid = AllocMidQEntry(hdr, server); |
a6827c18 JL |
370 | if (mid == NULL) { |
371 | mutex_unlock(&server->srv_mutex); | |
2d86dbc9 | 372 | cifs_add_credits(server, 1); |
0193e072 | 373 | wake_up(&server->request_q); |
a6827c18 JL |
374 | return -ENOMEM; |
375 | } | |
376 | ||
377 | /* put it on the pending_mid_q */ | |
378 | spin_lock(&GlobalMid_Lock); | |
379 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
380 | spin_unlock(&GlobalMid_Lock); | |
381 | ||
fcc31cb6 | 382 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); |
a6827c18 JL |
383 | if (rc) { |
384 | mutex_unlock(&server->srv_mutex); | |
385 | goto out_err; | |
386 | } | |
387 | ||
44d22d84 | 388 | mid->receive = receive; |
a6827c18 JL |
389 | mid->callback = callback; |
390 | mid->callback_data = cbdata; | |
391 | mid->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
392 | |
393 | cifs_in_send_inc(server); | |
fcc31cb6 | 394 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
395 | cifs_in_send_dec(server); |
396 | cifs_save_when_sent(mid); | |
a6827c18 | 397 | mutex_unlock(&server->srv_mutex); |
789e6661 | 398 | |
a6827c18 JL |
399 | if (rc) |
400 | goto out_err; | |
401 | ||
402 | return rc; | |
403 | out_err: | |
404 | delete_mid(mid); | |
2d86dbc9 | 405 | cifs_add_credits(server, 1); |
a6827c18 JL |
406 | wake_up(&server->request_q); |
407 | return rc; | |
408 | } | |
409 | ||
133672ef SF |
410 | /* |
411 | * | |
412 | * Send an SMB Request. No response info (other than return code) | |
413 | * needs to be parsed. | |
414 | * | |
415 | * flags indicate the type of request buffer and how long to wait | |
416 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
417 | * | |
418 | */ | |
419 | int | |
96daf2b0 | 420 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
133672ef SF |
421 | struct smb_hdr *in_buf, int flags) |
422 | { | |
423 | int rc; | |
424 | struct kvec iov[1]; | |
425 | int resp_buf_type; | |
426 | ||
427 | iov[0].iov_base = (char *)in_buf; | |
be8e3b00 | 428 | iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4; |
133672ef SF |
429 | flags |= CIFS_NO_RESP; |
430 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 431 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 432 | |
133672ef SF |
433 | return rc; |
434 | } | |
435 | ||
053d5034 | 436 | static int |
3c1105df | 437 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
438 | { |
439 | int rc = 0; | |
440 | ||
74dd92a8 JL |
441 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
442 | mid->mid, mid->midState); | |
053d5034 | 443 | |
74dd92a8 JL |
444 | spin_lock(&GlobalMid_Lock); |
445 | switch (mid->midState) { | |
446 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
447 | spin_unlock(&GlobalMid_Lock); |
448 | return rc; | |
74dd92a8 JL |
449 | case MID_RETRY_NEEDED: |
450 | rc = -EAGAIN; | |
451 | break; | |
71823baf JL |
452 | case MID_RESPONSE_MALFORMED: |
453 | rc = -EIO; | |
454 | break; | |
3c1105df JL |
455 | case MID_SHUTDOWN: |
456 | rc = -EHOSTDOWN; | |
457 | break; | |
74dd92a8 | 458 | default: |
3c1105df | 459 | list_del_init(&mid->qhead); |
74dd92a8 JL |
460 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, |
461 | mid->mid, mid->midState); | |
462 | rc = -EIO; | |
053d5034 JL |
463 | } |
464 | spin_unlock(&GlobalMid_Lock); | |
465 | ||
2b84a36c | 466 | DeleteMidQEntry(mid); |
053d5034 JL |
467 | return rc; |
468 | } | |
469 | ||
76dcc26f JL |
470 | /* |
471 | * An NT cancel request header looks just like the original request except: | |
472 | * | |
473 | * The Command is SMB_COM_NT_CANCEL | |
474 | * The WordCount is zeroed out | |
475 | * The ByteCount is zeroed out | |
476 | * | |
477 | * This function mangles an existing request buffer into a | |
478 | * SMB_COM_NT_CANCEL request and then sends it. | |
479 | */ | |
480 | static int | |
481 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
482 | struct mid_q_entry *mid) | |
483 | { | |
484 | int rc = 0; | |
485 | ||
486 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 487 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
488 | in_buf->Command = SMB_COM_NT_CANCEL; |
489 | in_buf->WordCount = 0; | |
820a803f | 490 | put_bcc(0, in_buf); |
76dcc26f JL |
491 | |
492 | mutex_lock(&server->srv_mutex); | |
493 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
494 | if (rc) { | |
495 | mutex_unlock(&server->srv_mutex); | |
496 | return rc; | |
497 | } | |
be8e3b00 | 498 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
499 | mutex_unlock(&server->srv_mutex); |
500 | ||
501 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
502 | in_buf->Mid, rc); | |
503 | ||
504 | return rc; | |
505 | } | |
506 | ||
2c8f981d JL |
507 | int |
508 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
509 | bool log_error) | |
510 | { | |
826a95e4 JL |
511 | unsigned int len = be32_to_cpu(mid->resp_buf->smb_buf_length) + 4; |
512 | ||
513 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
514 | |
515 | /* convert the length into a more usable form */ | |
96daf2b0 | 516 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
517 | struct kvec iov; |
518 | ||
519 | iov.iov_base = mid->resp_buf; | |
520 | iov.iov_len = len; | |
2c8f981d | 521 | /* FIXME: add code to kill session */ |
826a95e4 | 522 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
523 | mid->sequence_number + 1) != 0) |
524 | cERROR(1, "Unexpected SMB signature"); | |
525 | } | |
526 | ||
527 | /* BB special case reconnect tid and uid here? */ | |
528 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
529 | } | |
530 | ||
7ee1af76 | 531 | int |
96daf2b0 | 532 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 533 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 534 | const int flags) |
7ee1af76 JA |
535 | { |
536 | int rc = 0; | |
133672ef | 537 | int long_op; |
7ee1af76 JA |
538 | struct mid_q_entry *midQ; |
539 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 540 | |
133672ef SF |
541 | long_op = flags & CIFS_TIMEOUT_MASK; |
542 | ||
7ee1af76 JA |
543 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
544 | ||
545 | if ((ses == NULL) || (ses->server == NULL)) { | |
546 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 547 | cERROR(1, "Null session"); |
7ee1af76 JA |
548 | return -EIO; |
549 | } | |
550 | ||
79a58d1f | 551 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
552 | cifs_small_buf_release(in_buf); |
553 | return -ENOENT; | |
554 | } | |
555 | ||
79a58d1f | 556 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
557 | to the same server. We may make this configurable later or |
558 | use ses->maxReq */ | |
559 | ||
c5797a94 | 560 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
561 | if (rc) { |
562 | cifs_small_buf_release(in_buf); | |
563 | return rc; | |
564 | } | |
565 | ||
79a58d1f | 566 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
567 | and avoid races inside tcp sendmsg code that could cause corruption |
568 | of smb data */ | |
569 | ||
72ca545b | 570 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
571 | |
572 | rc = allocate_mid(ses, in_buf, &midQ); | |
573 | if (rc) { | |
72ca545b | 574 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 575 | cifs_small_buf_release(in_buf); |
7ee1af76 | 576 | /* Update # of requests on wire to server */ |
2d86dbc9 | 577 | cifs_add_credits(ses->server, 1); |
7ee1af76 | 578 | return rc; |
1da177e4 | 579 | } |
79a58d1f | 580 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
581 | if (rc) { |
582 | mutex_unlock(&ses->server->srv_mutex); | |
583 | cifs_small_buf_release(in_buf); | |
584 | goto out; | |
585 | } | |
1da177e4 LT |
586 | |
587 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 | 588 | cifs_in_send_inc(ses->server); |
0496e02d | 589 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
590 | cifs_in_send_dec(ses->server); |
591 | cifs_save_when_sent(midQ); | |
7ee1af76 | 592 | |
72ca545b | 593 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 594 | |
2db7c581 JL |
595 | if (rc < 0) { |
596 | cifs_small_buf_release(in_buf); | |
7ee1af76 | 597 | goto out; |
2db7c581 | 598 | } |
4b8f930f | 599 | |
2db7c581 JL |
600 | if (long_op == CIFS_ASYNC_OP) { |
601 | cifs_small_buf_release(in_buf); | |
133672ef | 602 | goto out; |
2db7c581 | 603 | } |
d6e04ae6 | 604 | |
0ade640e | 605 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 606 | if (rc != 0) { |
2db7c581 | 607 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
608 | spin_lock(&GlobalMid_Lock); |
609 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
610 | midQ->callback = DeleteMidQEntry; | |
611 | spin_unlock(&GlobalMid_Lock); | |
2db7c581 | 612 | cifs_small_buf_release(in_buf); |
2d86dbc9 | 613 | cifs_add_credits(ses->server, 1); |
1be912dd JL |
614 | return rc; |
615 | } | |
616 | spin_unlock(&GlobalMid_Lock); | |
617 | } | |
d6e04ae6 | 618 | |
2db7c581 JL |
619 | cifs_small_buf_release(in_buf); |
620 | ||
3c1105df | 621 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 622 | if (rc != 0) { |
2d86dbc9 | 623 | cifs_add_credits(ses->server, 1); |
d6e04ae6 SF |
624 | return rc; |
625 | } | |
50c2f753 | 626 | |
2c8f981d | 627 | if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 628 | rc = -EIO; |
2c8f981d | 629 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
630 | goto out; |
631 | } | |
632 | ||
2c8f981d JL |
633 | iov[0].iov_base = (char *)midQ->resp_buf; |
634 | iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; | |
635 | if (midQ->largeBuf) | |
636 | *pRespBufType = CIFS_LARGE_BUFFER; | |
637 | else | |
638 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 639 | |
2c8f981d | 640 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 641 | |
2c8f981d JL |
642 | /* mark it so buf will not be freed by delete_mid */ |
643 | if ((flags & CIFS_NO_RESP) == 0) | |
644 | midQ->resp_buf = NULL; | |
7ee1af76 | 645 | out: |
ddc8cf8f | 646 | delete_mid(midQ); |
2d86dbc9 | 647 | cifs_add_credits(ses->server, 1); |
1da177e4 | 648 | |
d6e04ae6 SF |
649 | return rc; |
650 | } | |
1da177e4 LT |
651 | |
652 | int | |
96daf2b0 | 653 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
654 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
655 | int *pbytes_returned, const int long_op) | |
656 | { | |
657 | int rc = 0; | |
1da177e4 LT |
658 | struct mid_q_entry *midQ; |
659 | ||
660 | if (ses == NULL) { | |
b6b38f70 | 661 | cERROR(1, "Null smb session"); |
1da177e4 LT |
662 | return -EIO; |
663 | } | |
79a58d1f | 664 | if (ses->server == NULL) { |
b6b38f70 | 665 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
666 | return -EIO; |
667 | } | |
668 | ||
79a58d1f | 669 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
670 | return -ENOENT; |
671 | ||
79a58d1f | 672 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
673 | to the same server. We may make this configurable later or |
674 | use ses->maxReq */ | |
1da177e4 | 675 | |
be8e3b00 SF |
676 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
677 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 678 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 679 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
680 | return -EIO; |
681 | } | |
682 | ||
c5797a94 | 683 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
684 | if (rc) |
685 | return rc; | |
686 | ||
79a58d1f | 687 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
688 | and avoid races inside tcp sendmsg code that could cause corruption |
689 | of smb data */ | |
690 | ||
72ca545b | 691 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 692 | |
7ee1af76 JA |
693 | rc = allocate_mid(ses, in_buf, &midQ); |
694 | if (rc) { | |
72ca545b | 695 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 696 | /* Update # of requests on wire to server */ |
2d86dbc9 | 697 | cifs_add_credits(ses->server, 1); |
7ee1af76 | 698 | return rc; |
1da177e4 LT |
699 | } |
700 | ||
ad009ac9 | 701 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
702 | if (rc) { |
703 | mutex_unlock(&ses->server->srv_mutex); | |
704 | goto out; | |
705 | } | |
1da177e4 LT |
706 | |
707 | midQ->midState = MID_REQUEST_SUBMITTED; | |
789e6661 SF |
708 | |
709 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 710 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
711 | cifs_in_send_dec(ses->server); |
712 | cifs_save_when_sent(midQ); | |
72ca545b | 713 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 714 | |
79a58d1f | 715 | if (rc < 0) |
7ee1af76 JA |
716 | goto out; |
717 | ||
0ade640e | 718 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 719 | goto out; |
1da177e4 | 720 | |
0ade640e | 721 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 722 | if (rc != 0) { |
2db7c581 | 723 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
724 | spin_lock(&GlobalMid_Lock); |
725 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
726 | /* no longer considered to be "in-flight" */ | |
727 | midQ->callback = DeleteMidQEntry; | |
728 | spin_unlock(&GlobalMid_Lock); | |
2d86dbc9 | 729 | cifs_add_credits(ses->server, 1); |
1be912dd JL |
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) { |
2d86dbc9 | 737 | cifs_add_credits(ses->server, 1); |
1da177e4 LT |
738 | return rc; |
739 | } | |
50c2f753 | 740 | |
2c8f981d JL |
741 | if (!midQ->resp_buf || !out_buf || |
742 | midQ->midState != MID_RESPONSE_RECEIVED) { | |
2b2bdfba | 743 | rc = -EIO; |
b6b38f70 | 744 | cERROR(1, "Bad MID state?"); |
2c8f981d | 745 | goto out; |
1da177e4 | 746 | } |
7ee1af76 | 747 | |
2c8f981d JL |
748 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
749 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
750 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 751 | out: |
ddc8cf8f | 752 | delete_mid(midQ); |
2d86dbc9 | 753 | cifs_add_credits(ses->server, 1); |
1da177e4 | 754 | |
7ee1af76 JA |
755 | return rc; |
756 | } | |
1da177e4 | 757 | |
7ee1af76 JA |
758 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
759 | blocking lock to return. */ | |
760 | ||
761 | static int | |
96daf2b0 | 762 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
763 | struct smb_hdr *in_buf, |
764 | struct smb_hdr *out_buf) | |
765 | { | |
766 | int bytes_returned; | |
96daf2b0 | 767 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
768 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
769 | ||
770 | /* We just modify the current in_buf to change | |
771 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
772 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
773 | LOCKING_ANDX_CANCEL_LOCK. */ | |
774 | ||
775 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
776 | pSMB->Timeout = 0; | |
777 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
778 | ||
779 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 780 | &bytes_returned, 0); |
7ee1af76 JA |
781 | } |
782 | ||
783 | int | |
96daf2b0 | 784 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
785 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
786 | int *pbytes_returned) | |
787 | { | |
788 | int rc = 0; | |
789 | int rstart = 0; | |
7ee1af76 | 790 | struct mid_q_entry *midQ; |
96daf2b0 | 791 | struct cifs_ses *ses; |
7ee1af76 JA |
792 | |
793 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 794 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
795 | return -EIO; |
796 | } | |
797 | ses = tcon->ses; | |
798 | ||
79a58d1f | 799 | if (ses->server == NULL) { |
b6b38f70 | 800 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
801 | return -EIO; |
802 | } | |
803 | ||
79a58d1f | 804 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
805 | return -ENOENT; |
806 | ||
79a58d1f | 807 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
808 | to the same server. We may make this configurable later or |
809 | use ses->maxReq */ | |
810 | ||
be8e3b00 SF |
811 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
812 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 813 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 814 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
815 | return -EIO; |
816 | } | |
817 | ||
c5797a94 | 818 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
819 | if (rc) |
820 | return rc; | |
821 | ||
79a58d1f | 822 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
823 | and avoid races inside tcp sendmsg code that could cause corruption |
824 | of smb data */ | |
825 | ||
72ca545b | 826 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
827 | |
828 | rc = allocate_mid(ses, in_buf, &midQ); | |
829 | if (rc) { | |
72ca545b | 830 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
831 | return rc; |
832 | } | |
833 | ||
7ee1af76 | 834 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 835 | if (rc) { |
ddc8cf8f | 836 | delete_mid(midQ); |
829049cb VL |
837 | mutex_unlock(&ses->server->srv_mutex); |
838 | return rc; | |
839 | } | |
1da177e4 | 840 | |
7ee1af76 | 841 | midQ->midState = MID_REQUEST_SUBMITTED; |
789e6661 | 842 | cifs_in_send_inc(ses->server); |
be8e3b00 | 843 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
844 | cifs_in_send_dec(ses->server); |
845 | cifs_save_when_sent(midQ); | |
72ca545b | 846 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 847 | |
79a58d1f | 848 | if (rc < 0) { |
ddc8cf8f | 849 | delete_mid(midQ); |
7ee1af76 JA |
850 | return rc; |
851 | } | |
852 | ||
853 | /* Wait for a reply - allow signals to interrupt. */ | |
854 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 855 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
856 | ((ses->server->tcpStatus != CifsGood) && |
857 | (ses->server->tcpStatus != CifsNew))); | |
858 | ||
859 | /* Were we interrupted by a signal ? */ | |
860 | if ((rc == -ERESTARTSYS) && | |
861 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
862 | ((ses->server->tcpStatus == CifsGood) || | |
863 | (ses->server->tcpStatus == CifsNew))) { | |
864 | ||
865 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
866 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
867 | blocking lock to return. */ | |
76dcc26f | 868 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 869 | if (rc) { |
ddc8cf8f | 870 | delete_mid(midQ); |
7ee1af76 JA |
871 | return rc; |
872 | } | |
873 | } else { | |
874 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
875 | to cause the blocking lock to return. */ | |
876 | ||
877 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
878 | ||
879 | /* If we get -ENOLCK back the lock may have | |
880 | already been removed. Don't exit in this case. */ | |
881 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 882 | delete_mid(midQ); |
7ee1af76 JA |
883 | return rc; |
884 | } | |
885 | } | |
886 | ||
1be912dd JL |
887 | rc = wait_for_response(ses->server, midQ); |
888 | if (rc) { | |
2db7c581 | 889 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd JL |
890 | spin_lock(&GlobalMid_Lock); |
891 | if (midQ->midState == MID_REQUEST_SUBMITTED) { | |
892 | /* no longer considered to be "in-flight" */ | |
893 | midQ->callback = DeleteMidQEntry; | |
894 | spin_unlock(&GlobalMid_Lock); | |
895 | return rc; | |
896 | } | |
897 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 898 | } |
1be912dd JL |
899 | |
900 | /* We got the response - restart system call. */ | |
901 | rstart = 1; | |
7ee1af76 JA |
902 | } |
903 | ||
3c1105df | 904 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 905 | if (rc != 0) |
7ee1af76 | 906 | return rc; |
50c2f753 | 907 | |
17c8bfed | 908 | /* rcvd frame is ok */ |
2c8f981d | 909 | if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) { |
698e96a8 | 910 | rc = -EIO; |
b6b38f70 | 911 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
912 | goto out; |
913 | } | |
1da177e4 | 914 | |
2c8f981d JL |
915 | *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); |
916 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); | |
917 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 918 | out: |
ddc8cf8f | 919 | delete_mid(midQ); |
7ee1af76 JA |
920 | if (rstart && rc == -EACCES) |
921 | return -ERESTARTSYS; | |
1da177e4 LT |
922 | return rc; |
923 | } |