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> | |
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; | |
7c9421e1 PS |
63 | temp->command = cpu_to_le16(smb_buffer->Command); |
64 | cFYI(1, "For smb_command %d", smb_buffer->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 | 77 | atomic_inc(&midCount); |
7c9421e1 | 78 | temp->mid_state = 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 | |
7c9421e1 | 88 | midEntry->mid_state = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
7c9421e1 | 90 | if (midEntry->large_buf) |
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) && | |
7c9421e1 PS |
100 | (midEntry->command != cpu_to_le16(SMB_COM_LOCKING_ANDX))) { |
101 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", | |
1047abc1 SF |
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 | unsigned int len = iov[0].iov_len; |
130 | unsigned int total_len; | |
131 | int first_vec = 0; | |
792af7b0 | 132 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
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); |
792af7b0 | 152 | dump_smb(iov[0].iov_base, len); |
1da177e4 | 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++; | |
792af7b0 PS |
160 | /* |
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 a response from | |
167 | * the server in SendReceive[2] for the server to send | |
168 | * a response back for most types of requests (except | |
169 | * SMB Write 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 | */ | |
da505c38 | 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 LT |
236 | |
237 | return rc; | |
238 | } | |
239 | ||
0496e02d JL |
240 | int |
241 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
242 | unsigned int smb_buf_length) | |
243 | { | |
244 | struct kvec iov; | |
245 | ||
246 | iov.iov_base = smb_buffer; | |
247 | iov.iov_len = smb_buf_length + 4; | |
248 | ||
249 | return smb_sendv(server, &iov, 1); | |
250 | } | |
251 | ||
fc40f9cf | 252 | static int |
bc205ed1 PS |
253 | wait_for_free_credits(struct TCP_Server_Info *server, const int optype, |
254 | int *credits) | |
1da177e4 | 255 | { |
5bc59498 PS |
256 | int rc; |
257 | ||
fc40f9cf | 258 | spin_lock(&server->req_lock); |
bc205ed1 | 259 | if (optype == CIFS_ASYNC_OP) { |
1da177e4 | 260 | /* oplock breaks must not be held up */ |
fc40f9cf | 261 | server->in_flight++; |
bc205ed1 | 262 | *credits -= 1; |
fc40f9cf | 263 | spin_unlock(&server->req_lock); |
27a97a61 VL |
264 | return 0; |
265 | } | |
266 | ||
27a97a61 | 267 | while (1) { |
bc205ed1 | 268 | if (*credits <= 0) { |
fc40f9cf | 269 | spin_unlock(&server->req_lock); |
789e6661 | 270 | cifs_num_waiters_inc(server); |
5bc59498 | 271 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 272 | has_credits(server, credits)); |
789e6661 | 273 | cifs_num_waiters_dec(server); |
5bc59498 PS |
274 | if (rc) |
275 | return rc; | |
fc40f9cf | 276 | spin_lock(&server->req_lock); |
27a97a61 | 277 | } else { |
c5797a94 | 278 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 279 | spin_unlock(&server->req_lock); |
27a97a61 | 280 | return -ENOENT; |
1da177e4 | 281 | } |
27a97a61 | 282 | |
2d86dbc9 PS |
283 | /* |
284 | * Can not count locking commands against total | |
285 | * as they are allowed to block on server. | |
286 | */ | |
27a97a61 VL |
287 | |
288 | /* update # of requests on the wire to server */ | |
bc205ed1 PS |
289 | if (optype != CIFS_BLOCKING_OP) { |
290 | *credits -= 1; | |
fc40f9cf | 291 | server->in_flight++; |
2d86dbc9 | 292 | } |
fc40f9cf | 293 | spin_unlock(&server->req_lock); |
27a97a61 | 294 | break; |
1da177e4 LT |
295 | } |
296 | } | |
7ee1af76 JA |
297 | return 0; |
298 | } | |
1da177e4 | 299 | |
bc205ed1 PS |
300 | static int |
301 | wait_for_free_request(struct TCP_Server_Info *server, const int optype) | |
302 | { | |
45275789 PS |
303 | return wait_for_free_credits(server, optype, |
304 | server->ops->get_credits_field(server)); | |
bc205ed1 PS |
305 | } |
306 | ||
96daf2b0 | 307 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
308 | struct mid_q_entry **ppmidQ) |
309 | { | |
1da177e4 | 310 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 311 | return -ENOENT; |
8fbbd365 VL |
312 | } |
313 | ||
314 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 315 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 316 | return -EAGAIN; |
8fbbd365 VL |
317 | } |
318 | ||
319 | if (ses->status != CifsGood) { | |
1da177e4 | 320 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 321 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 322 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 323 | return -EAGAIN; |
ad7a2926 | 324 | /* else ok - we are setting up session */ |
1da177e4 | 325 | } |
24b9b06b | 326 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 327 | if (*ppmidQ == NULL) |
7ee1af76 | 328 | return -ENOMEM; |
ddc8cf8f JL |
329 | spin_lock(&GlobalMid_Lock); |
330 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
331 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
332 | return 0; |
333 | } | |
334 | ||
0ade640e JL |
335 | static int |
336 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 337 | { |
0ade640e | 338 | int error; |
7ee1af76 | 339 | |
f06ac72e | 340 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 341 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
342 | if (error < 0) |
343 | return -ERESTARTSYS; | |
7ee1af76 | 344 | |
0ade640e | 345 | return 0; |
7ee1af76 JA |
346 | } |
347 | ||
792af7b0 PS |
348 | static int |
349 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, | |
350 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
351 | { | |
352 | int rc; | |
353 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
354 | struct mid_q_entry *mid; | |
355 | ||
356 | /* enable signing if server requires it */ | |
357 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
358 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
359 | ||
360 | mid = AllocMidQEntry(hdr, server); | |
361 | if (mid == NULL) | |
362 | return -ENOMEM; | |
363 | ||
762a4206 | 364 | rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number); |
ffc61ccb SP |
365 | if (rc) { |
366 | DeleteMidQEntry(mid); | |
367 | return rc; | |
368 | } | |
369 | ||
792af7b0 | 370 | *ret_mid = mid; |
ffc61ccb | 371 | return 0; |
792af7b0 | 372 | } |
133672ef | 373 | |
a6827c18 JL |
374 | /* |
375 | * Send a SMB request and set the callback function in the mid to handle | |
376 | * the result. Caller is responsible for dealing with timeouts. | |
377 | */ | |
378 | int | |
fcc31cb6 | 379 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 JL |
380 | unsigned int nvec, mid_receive_t *receive, |
381 | mid_callback_t *callback, void *cbdata, bool ignore_pend) | |
a6827c18 JL |
382 | { |
383 | int rc; | |
384 | struct mid_q_entry *mid; | |
385 | ||
59ffd841 | 386 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
387 | if (rc) |
388 | return rc; | |
389 | ||
390 | mutex_lock(&server->srv_mutex); | |
792af7b0 PS |
391 | rc = cifs_setup_async_request(server, iov, nvec, &mid); |
392 | if (rc) { | |
a6827c18 | 393 | mutex_unlock(&server->srv_mutex); |
45275789 | 394 | add_credits(server, 1); |
0193e072 | 395 | wake_up(&server->request_q); |
792af7b0 | 396 | return rc; |
a6827c18 JL |
397 | } |
398 | ||
44d22d84 | 399 | mid->receive = receive; |
a6827c18 JL |
400 | mid->callback = callback; |
401 | mid->callback_data = cbdata; | |
7c9421e1 | 402 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 403 | |
ffc61ccb SP |
404 | /* put it on the pending_mid_q */ |
405 | spin_lock(&GlobalMid_Lock); | |
406 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
407 | spin_unlock(&GlobalMid_Lock); | |
408 | ||
409 | ||
789e6661 | 410 | cifs_in_send_inc(server); |
fcc31cb6 | 411 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
412 | cifs_in_send_dec(server); |
413 | cifs_save_when_sent(mid); | |
a6827c18 | 414 | mutex_unlock(&server->srv_mutex); |
789e6661 | 415 | |
ffc61ccb SP |
416 | if (rc == 0) |
417 | return 0; | |
a6827c18 | 418 | |
a6827c18 | 419 | delete_mid(mid); |
45275789 | 420 | add_credits(server, 1); |
a6827c18 JL |
421 | wake_up(&server->request_q); |
422 | return rc; | |
423 | } | |
424 | ||
133672ef SF |
425 | /* |
426 | * | |
427 | * Send an SMB Request. No response info (other than return code) | |
428 | * needs to be parsed. | |
429 | * | |
430 | * flags indicate the type of request buffer and how long to wait | |
431 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
432 | * | |
433 | */ | |
434 | int | |
96daf2b0 | 435 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 436 | char *in_buf, int flags) |
133672ef SF |
437 | { |
438 | int rc; | |
439 | struct kvec iov[1]; | |
440 | int resp_buf_type; | |
441 | ||
792af7b0 PS |
442 | iov[0].iov_base = in_buf; |
443 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
444 | flags |= CIFS_NO_RESP; |
445 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 446 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 447 | |
133672ef SF |
448 | return rc; |
449 | } | |
450 | ||
053d5034 | 451 | static int |
3c1105df | 452 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
453 | { |
454 | int rc = 0; | |
455 | ||
7c9421e1 PS |
456 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
457 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 458 | |
74dd92a8 | 459 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 460 | switch (mid->mid_state) { |
74dd92a8 | 461 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
462 | spin_unlock(&GlobalMid_Lock); |
463 | return rc; | |
74dd92a8 JL |
464 | case MID_RETRY_NEEDED: |
465 | rc = -EAGAIN; | |
466 | break; | |
71823baf JL |
467 | case MID_RESPONSE_MALFORMED: |
468 | rc = -EIO; | |
469 | break; | |
3c1105df JL |
470 | case MID_SHUTDOWN: |
471 | rc = -EHOSTDOWN; | |
472 | break; | |
74dd92a8 | 473 | default: |
3c1105df | 474 | list_del_init(&mid->qhead); |
7c9421e1 PS |
475 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
476 | mid->mid, mid->mid_state); | |
74dd92a8 | 477 | rc = -EIO; |
053d5034 JL |
478 | } |
479 | spin_unlock(&GlobalMid_Lock); | |
480 | ||
2b84a36c | 481 | DeleteMidQEntry(mid); |
053d5034 JL |
482 | return rc; |
483 | } | |
484 | ||
121b046a JL |
485 | static inline int |
486 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 487 | { |
121b046a JL |
488 | return server->ops->send_cancel ? |
489 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
490 | } |
491 | ||
2c8f981d JL |
492 | int |
493 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
494 | bool log_error) | |
495 | { | |
792af7b0 | 496 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
497 | |
498 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
499 | |
500 | /* convert the length into a more usable form */ | |
96daf2b0 | 501 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
502 | struct kvec iov; |
503 | ||
504 | iov.iov_base = mid->resp_buf; | |
505 | iov.iov_len = len; | |
2c8f981d | 506 | /* FIXME: add code to kill session */ |
826a95e4 | 507 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
508 | mid->sequence_number + 1) != 0) |
509 | cERROR(1, "Unexpected SMB signature"); | |
510 | } | |
511 | ||
512 | /* BB special case reconnect tid and uid here? */ | |
513 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
514 | } | |
515 | ||
082d0642 | 516 | int |
792af7b0 PS |
517 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
518 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
519 | { | |
520 | int rc; | |
521 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
522 | struct mid_q_entry *mid; | |
523 | ||
524 | rc = allocate_mid(ses, hdr, &mid); | |
525 | if (rc) | |
526 | return rc; | |
762a4206 | 527 | rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number); |
792af7b0 PS |
528 | if (rc) |
529 | delete_mid(mid); | |
530 | *ret_mid = mid; | |
531 | return rc; | |
532 | } | |
533 | ||
7ee1af76 | 534 | int |
96daf2b0 | 535 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 536 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 537 | const int flags) |
7ee1af76 JA |
538 | { |
539 | int rc = 0; | |
133672ef | 540 | int long_op; |
7ee1af76 | 541 | struct mid_q_entry *midQ; |
792af7b0 | 542 | char *buf = iov[0].iov_base; |
50c2f753 | 543 | |
133672ef SF |
544 | long_op = flags & CIFS_TIMEOUT_MASK; |
545 | ||
7ee1af76 JA |
546 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
547 | ||
548 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 549 | cifs_small_buf_release(buf); |
b6b38f70 | 550 | cERROR(1, "Null session"); |
7ee1af76 JA |
551 | return -EIO; |
552 | } | |
553 | ||
79a58d1f | 554 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 555 | cifs_small_buf_release(buf); |
7ee1af76 JA |
556 | return -ENOENT; |
557 | } | |
558 | ||
792af7b0 PS |
559 | /* |
560 | * Ensure that we do not send more than 50 overlapping requests | |
561 | * to the same server. We may make this configurable later or | |
562 | * use ses->maxReq. | |
563 | */ | |
7ee1af76 | 564 | |
c5797a94 | 565 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 | 566 | if (rc) { |
792af7b0 | 567 | cifs_small_buf_release(buf); |
7ee1af76 JA |
568 | return rc; |
569 | } | |
570 | ||
792af7b0 PS |
571 | /* |
572 | * Make sure that we sign in the same order that we send on this socket | |
573 | * and avoid races inside tcp sendmsg code that could cause corruption | |
574 | * of smb data. | |
575 | */ | |
7ee1af76 | 576 | |
72ca545b | 577 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 578 | |
082d0642 | 579 | rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ); |
7ee1af76 | 580 | if (rc) { |
72ca545b | 581 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 582 | cifs_small_buf_release(buf); |
7ee1af76 | 583 | /* Update # of requests on wire to server */ |
45275789 | 584 | add_credits(ses->server, 1); |
7ee1af76 | 585 | return rc; |
1da177e4 | 586 | } |
1da177e4 | 587 | |
7c9421e1 | 588 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 589 | cifs_in_send_inc(ses->server); |
0496e02d | 590 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
591 | cifs_in_send_dec(ses->server); |
592 | cifs_save_when_sent(midQ); | |
7ee1af76 | 593 | |
72ca545b | 594 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 595 | |
2db7c581 | 596 | if (rc < 0) { |
792af7b0 | 597 | cifs_small_buf_release(buf); |
7ee1af76 | 598 | goto out; |
2db7c581 | 599 | } |
4b8f930f | 600 | |
2db7c581 | 601 | if (long_op == CIFS_ASYNC_OP) { |
792af7b0 | 602 | cifs_small_buf_release(buf); |
133672ef | 603 | goto out; |
2db7c581 | 604 | } |
d6e04ae6 | 605 | |
0ade640e | 606 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 607 | if (rc != 0) { |
121b046a | 608 | send_cancel(ses->server, buf, midQ); |
1be912dd | 609 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 610 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
611 | midQ->callback = DeleteMidQEntry; |
612 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 613 | cifs_small_buf_release(buf); |
45275789 | 614 | add_credits(ses->server, 1); |
1be912dd JL |
615 | return rc; |
616 | } | |
617 | spin_unlock(&GlobalMid_Lock); | |
618 | } | |
d6e04ae6 | 619 | |
792af7b0 | 620 | cifs_small_buf_release(buf); |
2db7c581 | 621 | |
3c1105df | 622 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 623 | if (rc != 0) { |
45275789 | 624 | add_credits(ses->server, 1); |
d6e04ae6 SF |
625 | return rc; |
626 | } | |
50c2f753 | 627 | |
7c9421e1 | 628 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 629 | rc = -EIO; |
2c8f981d | 630 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
631 | goto out; |
632 | } | |
633 | ||
792af7b0 PS |
634 | buf = (char *)midQ->resp_buf; |
635 | iov[0].iov_base = buf; | |
636 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 637 | if (midQ->large_buf) |
2c8f981d JL |
638 | *pRespBufType = CIFS_LARGE_BUFFER; |
639 | else | |
640 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 641 | |
082d0642 PS |
642 | rc = ses->server->ops->check_receive(midQ, ses->server, |
643 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 644 | |
2c8f981d JL |
645 | /* mark it so buf will not be freed by delete_mid */ |
646 | if ((flags & CIFS_NO_RESP) == 0) | |
647 | midQ->resp_buf = NULL; | |
7ee1af76 | 648 | out: |
ddc8cf8f | 649 | delete_mid(midQ); |
45275789 | 650 | add_credits(ses->server, 1); |
1da177e4 | 651 | |
d6e04ae6 SF |
652 | return rc; |
653 | } | |
1da177e4 LT |
654 | |
655 | int | |
96daf2b0 | 656 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
657 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
658 | int *pbytes_returned, const int long_op) | |
659 | { | |
660 | int rc = 0; | |
1da177e4 LT |
661 | struct mid_q_entry *midQ; |
662 | ||
663 | if (ses == NULL) { | |
b6b38f70 | 664 | cERROR(1, "Null smb session"); |
1da177e4 LT |
665 | return -EIO; |
666 | } | |
79a58d1f | 667 | if (ses->server == NULL) { |
b6b38f70 | 668 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
669 | return -EIO; |
670 | } | |
671 | ||
79a58d1f | 672 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
673 | return -ENOENT; |
674 | ||
79a58d1f | 675 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
676 | to the same server. We may make this configurable later or |
677 | use ses->maxReq */ | |
1da177e4 | 678 | |
be8e3b00 SF |
679 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
680 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 681 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 682 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
683 | return -EIO; |
684 | } | |
685 | ||
c5797a94 | 686 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
687 | if (rc) |
688 | return rc; | |
689 | ||
79a58d1f | 690 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
691 | and avoid races inside tcp sendmsg code that could cause corruption |
692 | of smb data */ | |
693 | ||
72ca545b | 694 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 695 | |
7ee1af76 JA |
696 | rc = allocate_mid(ses, in_buf, &midQ); |
697 | if (rc) { | |
72ca545b | 698 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 699 | /* Update # of requests on wire to server */ |
45275789 | 700 | add_credits(ses->server, 1); |
7ee1af76 | 701 | return rc; |
1da177e4 LT |
702 | } |
703 | ||
ad009ac9 | 704 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
705 | if (rc) { |
706 | mutex_unlock(&ses->server->srv_mutex); | |
707 | goto out; | |
708 | } | |
1da177e4 | 709 | |
7c9421e1 | 710 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
711 | |
712 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 713 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
714 | cifs_in_send_dec(ses->server); |
715 | cifs_save_when_sent(midQ); | |
72ca545b | 716 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 717 | |
79a58d1f | 718 | if (rc < 0) |
7ee1af76 JA |
719 | goto out; |
720 | ||
0ade640e | 721 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 722 | goto out; |
1da177e4 | 723 | |
0ade640e | 724 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 725 | if (rc != 0) { |
121b046a | 726 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 727 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 728 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
729 | /* no longer considered to be "in-flight" */ |
730 | midQ->callback = DeleteMidQEntry; | |
731 | spin_unlock(&GlobalMid_Lock); | |
45275789 | 732 | add_credits(ses->server, 1); |
1be912dd JL |
733 | return rc; |
734 | } | |
735 | spin_unlock(&GlobalMid_Lock); | |
736 | } | |
1da177e4 | 737 | |
3c1105df | 738 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 739 | if (rc != 0) { |
45275789 | 740 | add_credits(ses->server, 1); |
1da177e4 LT |
741 | return rc; |
742 | } | |
50c2f753 | 743 | |
2c8f981d | 744 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 745 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 746 | rc = -EIO; |
b6b38f70 | 747 | cERROR(1, "Bad MID state?"); |
2c8f981d | 748 | goto out; |
1da177e4 | 749 | } |
7ee1af76 | 750 | |
d4e4854f | 751 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
752 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
753 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 754 | out: |
ddc8cf8f | 755 | delete_mid(midQ); |
45275789 | 756 | add_credits(ses->server, 1); |
1da177e4 | 757 | |
7ee1af76 JA |
758 | return rc; |
759 | } | |
1da177e4 | 760 | |
7ee1af76 JA |
761 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
762 | blocking lock to return. */ | |
763 | ||
764 | static int | |
96daf2b0 | 765 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
766 | struct smb_hdr *in_buf, |
767 | struct smb_hdr *out_buf) | |
768 | { | |
769 | int bytes_returned; | |
96daf2b0 | 770 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
771 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
772 | ||
773 | /* We just modify the current in_buf to change | |
774 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
775 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
776 | LOCKING_ANDX_CANCEL_LOCK. */ | |
777 | ||
778 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
779 | pSMB->Timeout = 0; | |
88257360 | 780 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
781 | |
782 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 783 | &bytes_returned, 0); |
7ee1af76 JA |
784 | } |
785 | ||
786 | int | |
96daf2b0 | 787 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
788 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
789 | int *pbytes_returned) | |
790 | { | |
791 | int rc = 0; | |
792 | int rstart = 0; | |
7ee1af76 | 793 | struct mid_q_entry *midQ; |
96daf2b0 | 794 | struct cifs_ses *ses; |
7ee1af76 JA |
795 | |
796 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 797 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
798 | return -EIO; |
799 | } | |
800 | ses = tcon->ses; | |
801 | ||
79a58d1f | 802 | if (ses->server == NULL) { |
b6b38f70 | 803 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
804 | return -EIO; |
805 | } | |
806 | ||
79a58d1f | 807 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
808 | return -ENOENT; |
809 | ||
79a58d1f | 810 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
811 | to the same server. We may make this configurable later or |
812 | use ses->maxReq */ | |
813 | ||
be8e3b00 SF |
814 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
815 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 816 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 817 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
818 | return -EIO; |
819 | } | |
820 | ||
c5797a94 | 821 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
822 | if (rc) |
823 | return rc; | |
824 | ||
79a58d1f | 825 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
826 | and avoid races inside tcp sendmsg code that could cause corruption |
827 | of smb data */ | |
828 | ||
72ca545b | 829 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
830 | |
831 | rc = allocate_mid(ses, in_buf, &midQ); | |
832 | if (rc) { | |
72ca545b | 833 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
834 | return rc; |
835 | } | |
836 | ||
7ee1af76 | 837 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 838 | if (rc) { |
ddc8cf8f | 839 | delete_mid(midQ); |
829049cb VL |
840 | mutex_unlock(&ses->server->srv_mutex); |
841 | return rc; | |
842 | } | |
1da177e4 | 843 | |
7c9421e1 | 844 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 845 | cifs_in_send_inc(ses->server); |
be8e3b00 | 846 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
847 | cifs_in_send_dec(ses->server); |
848 | cifs_save_when_sent(midQ); | |
72ca545b | 849 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 850 | |
79a58d1f | 851 | if (rc < 0) { |
ddc8cf8f | 852 | delete_mid(midQ); |
7ee1af76 JA |
853 | return rc; |
854 | } | |
855 | ||
856 | /* Wait for a reply - allow signals to interrupt. */ | |
857 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 858 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
859 | ((ses->server->tcpStatus != CifsGood) && |
860 | (ses->server->tcpStatus != CifsNew))); | |
861 | ||
862 | /* Were we interrupted by a signal ? */ | |
863 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 864 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
865 | ((ses->server->tcpStatus == CifsGood) || |
866 | (ses->server->tcpStatus == CifsNew))) { | |
867 | ||
868 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
869 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
870 | blocking lock to return. */ | |
121b046a | 871 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 872 | if (rc) { |
ddc8cf8f | 873 | delete_mid(midQ); |
7ee1af76 JA |
874 | return rc; |
875 | } | |
876 | } else { | |
877 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
878 | to cause the blocking lock to return. */ | |
879 | ||
880 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
881 | ||
882 | /* If we get -ENOLCK back the lock may have | |
883 | already been removed. Don't exit in this case. */ | |
884 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 885 | delete_mid(midQ); |
7ee1af76 JA |
886 | return rc; |
887 | } | |
888 | } | |
889 | ||
1be912dd JL |
890 | rc = wait_for_response(ses->server, midQ); |
891 | if (rc) { | |
121b046a | 892 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 893 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 894 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
895 | /* no longer considered to be "in-flight" */ |
896 | midQ->callback = DeleteMidQEntry; | |
897 | spin_unlock(&GlobalMid_Lock); | |
898 | return rc; | |
899 | } | |
900 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 901 | } |
1be912dd JL |
902 | |
903 | /* We got the response - restart system call. */ | |
904 | rstart = 1; | |
7ee1af76 JA |
905 | } |
906 | ||
3c1105df | 907 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 908 | if (rc != 0) |
7ee1af76 | 909 | return rc; |
50c2f753 | 910 | |
17c8bfed | 911 | /* rcvd frame is ok */ |
7c9421e1 | 912 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 913 | rc = -EIO; |
b6b38f70 | 914 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
915 | goto out; |
916 | } | |
1da177e4 | 917 | |
d4e4854f | 918 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
919 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
920 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 921 | out: |
ddc8cf8f | 922 | delete_mid(midQ); |
7ee1af76 JA |
923 | if (rstart && rc == -EACCES) |
924 | return -ERESTARTSYS; | |
1da177e4 LT |
925 | return rc; |
926 | } |