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; | |
792af7b0 | 129 | __be32 *buf_len = (__be32 *)(iov[0].iov_base); |
3e84469d SF |
130 | unsigned int len = iov[0].iov_len; |
131 | unsigned int total_len; | |
132 | int first_vec = 0; | |
792af7b0 | 133 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
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); |
792af7b0 | 153 | dump_smb(iov[0].iov_base, len); |
1da177e4 | 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++; | |
792af7b0 PS |
161 | /* |
162 | * If blocking send we try 3 times, since each can block | |
163 | * for 5 seconds. For nonblocking we have to try more | |
164 | * but wait increasing amounts of time allowing time for | |
165 | * socket to clear. The overall time we wait in either | |
166 | * case to send on the socket is about 15 seconds. | |
167 | * Similarly we wait for 15 seconds for a response from | |
168 | * the server in SendReceive[2] for the server to send | |
169 | * a response back for most types of requests (except | |
170 | * SMB Write 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 | */ | |
da505c38 | 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 | |
792af7b0 PS |
238 | /* Don't want to modify the buffer as a side effect of this call. */ |
239 | *buf_len = 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 | ||
fc40f9cf | 256 | static int |
bc205ed1 PS |
257 | wait_for_free_credits(struct TCP_Server_Info *server, const int optype, |
258 | int *credits) | |
1da177e4 | 259 | { |
5bc59498 PS |
260 | int rc; |
261 | ||
fc40f9cf | 262 | spin_lock(&server->req_lock); |
bc205ed1 | 263 | if (optype == CIFS_ASYNC_OP) { |
1da177e4 | 264 | /* oplock breaks must not be held up */ |
fc40f9cf | 265 | server->in_flight++; |
bc205ed1 | 266 | *credits -= 1; |
fc40f9cf | 267 | spin_unlock(&server->req_lock); |
27a97a61 VL |
268 | return 0; |
269 | } | |
270 | ||
27a97a61 | 271 | while (1) { |
bc205ed1 | 272 | if (*credits <= 0) { |
fc40f9cf | 273 | spin_unlock(&server->req_lock); |
789e6661 | 274 | cifs_num_waiters_inc(server); |
5bc59498 | 275 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 276 | has_credits(server, credits)); |
789e6661 | 277 | cifs_num_waiters_dec(server); |
5bc59498 PS |
278 | if (rc) |
279 | return rc; | |
fc40f9cf | 280 | spin_lock(&server->req_lock); |
27a97a61 | 281 | } else { |
c5797a94 | 282 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 283 | spin_unlock(&server->req_lock); |
27a97a61 | 284 | return -ENOENT; |
1da177e4 | 285 | } |
27a97a61 | 286 | |
2d86dbc9 PS |
287 | /* |
288 | * Can not count locking commands against total | |
289 | * as they are allowed to block on server. | |
290 | */ | |
27a97a61 VL |
291 | |
292 | /* update # of requests on the wire to server */ | |
bc205ed1 PS |
293 | if (optype != CIFS_BLOCKING_OP) { |
294 | *credits -= 1; | |
fc40f9cf | 295 | server->in_flight++; |
2d86dbc9 | 296 | } |
fc40f9cf | 297 | spin_unlock(&server->req_lock); |
27a97a61 | 298 | break; |
1da177e4 LT |
299 | } |
300 | } | |
7ee1af76 JA |
301 | return 0; |
302 | } | |
1da177e4 | 303 | |
bc205ed1 PS |
304 | static int |
305 | wait_for_free_request(struct TCP_Server_Info *server, const int optype) | |
306 | { | |
45275789 PS |
307 | return wait_for_free_credits(server, optype, |
308 | server->ops->get_credits_field(server)); | |
bc205ed1 PS |
309 | } |
310 | ||
96daf2b0 | 311 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
312 | struct mid_q_entry **ppmidQ) |
313 | { | |
1da177e4 | 314 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 315 | return -ENOENT; |
8fbbd365 VL |
316 | } |
317 | ||
318 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 319 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 320 | return -EAGAIN; |
8fbbd365 VL |
321 | } |
322 | ||
323 | if (ses->status != CifsGood) { | |
1da177e4 | 324 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 325 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 326 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 327 | return -EAGAIN; |
ad7a2926 | 328 | /* else ok - we are setting up session */ |
1da177e4 | 329 | } |
24b9b06b | 330 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 331 | if (*ppmidQ == NULL) |
7ee1af76 | 332 | return -ENOMEM; |
ddc8cf8f JL |
333 | spin_lock(&GlobalMid_Lock); |
334 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
335 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
336 | return 0; |
337 | } | |
338 | ||
0ade640e JL |
339 | static int |
340 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 341 | { |
0ade640e | 342 | int error; |
7ee1af76 | 343 | |
f06ac72e | 344 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 345 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
346 | if (error < 0) |
347 | return -ERESTARTSYS; | |
7ee1af76 | 348 | |
0ade640e | 349 | return 0; |
7ee1af76 JA |
350 | } |
351 | ||
792af7b0 PS |
352 | static int |
353 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, | |
354 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
355 | { | |
356 | int rc; | |
357 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
358 | struct mid_q_entry *mid; | |
359 | ||
360 | /* enable signing if server requires it */ | |
361 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
362 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
363 | ||
364 | mid = AllocMidQEntry(hdr, server); | |
365 | if (mid == NULL) | |
366 | return -ENOMEM; | |
367 | ||
368 | /* put it on the pending_mid_q */ | |
369 | spin_lock(&GlobalMid_Lock); | |
370 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
371 | spin_unlock(&GlobalMid_Lock); | |
372 | ||
373 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); | |
374 | if (rc) | |
375 | delete_mid(mid); | |
376 | *ret_mid = mid; | |
377 | return rc; | |
378 | } | |
133672ef | 379 | |
a6827c18 JL |
380 | /* |
381 | * Send a SMB request and set the callback function in the mid to handle | |
382 | * the result. Caller is responsible for dealing with timeouts. | |
383 | */ | |
384 | int | |
fcc31cb6 | 385 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 JL |
386 | unsigned int nvec, mid_receive_t *receive, |
387 | mid_callback_t *callback, void *cbdata, bool ignore_pend) | |
a6827c18 JL |
388 | { |
389 | int rc; | |
390 | struct mid_q_entry *mid; | |
391 | ||
59ffd841 | 392 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
393 | if (rc) |
394 | return rc; | |
395 | ||
396 | mutex_lock(&server->srv_mutex); | |
792af7b0 PS |
397 | rc = cifs_setup_async_request(server, iov, nvec, &mid); |
398 | if (rc) { | |
a6827c18 | 399 | mutex_unlock(&server->srv_mutex); |
45275789 | 400 | add_credits(server, 1); |
0193e072 | 401 | wake_up(&server->request_q); |
792af7b0 | 402 | return rc; |
a6827c18 JL |
403 | } |
404 | ||
44d22d84 | 405 | mid->receive = receive; |
a6827c18 JL |
406 | mid->callback = callback; |
407 | mid->callback_data = cbdata; | |
7c9421e1 | 408 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
409 | |
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 | |
a6827c18 JL |
416 | if (rc) |
417 | goto out_err; | |
418 | ||
419 | return rc; | |
420 | out_err: | |
421 | delete_mid(mid); | |
45275789 | 422 | add_credits(server, 1); |
a6827c18 JL |
423 | wake_up(&server->request_q); |
424 | return rc; | |
425 | } | |
426 | ||
133672ef SF |
427 | /* |
428 | * | |
429 | * Send an SMB Request. No response info (other than return code) | |
430 | * needs to be parsed. | |
431 | * | |
432 | * flags indicate the type of request buffer and how long to wait | |
433 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
434 | * | |
435 | */ | |
436 | int | |
96daf2b0 | 437 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 438 | char *in_buf, int flags) |
133672ef SF |
439 | { |
440 | int rc; | |
441 | struct kvec iov[1]; | |
442 | int resp_buf_type; | |
443 | ||
792af7b0 PS |
444 | iov[0].iov_base = in_buf; |
445 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
446 | flags |= CIFS_NO_RESP; |
447 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 448 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 449 | |
133672ef SF |
450 | return rc; |
451 | } | |
452 | ||
053d5034 | 453 | static int |
3c1105df | 454 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
455 | { |
456 | int rc = 0; | |
457 | ||
7c9421e1 PS |
458 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
459 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 460 | |
74dd92a8 | 461 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 462 | switch (mid->mid_state) { |
74dd92a8 | 463 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
464 | spin_unlock(&GlobalMid_Lock); |
465 | return rc; | |
74dd92a8 JL |
466 | case MID_RETRY_NEEDED: |
467 | rc = -EAGAIN; | |
468 | break; | |
71823baf JL |
469 | case MID_RESPONSE_MALFORMED: |
470 | rc = -EIO; | |
471 | break; | |
3c1105df JL |
472 | case MID_SHUTDOWN: |
473 | rc = -EHOSTDOWN; | |
474 | break; | |
74dd92a8 | 475 | default: |
3c1105df | 476 | list_del_init(&mid->qhead); |
7c9421e1 PS |
477 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
478 | mid->mid, mid->mid_state); | |
74dd92a8 | 479 | rc = -EIO; |
053d5034 JL |
480 | } |
481 | spin_unlock(&GlobalMid_Lock); | |
482 | ||
2b84a36c | 483 | DeleteMidQEntry(mid); |
053d5034 JL |
484 | return rc; |
485 | } | |
486 | ||
121b046a JL |
487 | static inline int |
488 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 489 | { |
121b046a JL |
490 | return server->ops->send_cancel ? |
491 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
492 | } |
493 | ||
2c8f981d JL |
494 | int |
495 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
496 | bool log_error) | |
497 | { | |
792af7b0 | 498 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
499 | |
500 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
501 | |
502 | /* convert the length into a more usable form */ | |
96daf2b0 | 503 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
504 | struct kvec iov; |
505 | ||
506 | iov.iov_base = mid->resp_buf; | |
507 | iov.iov_len = len; | |
2c8f981d | 508 | /* FIXME: add code to kill session */ |
826a95e4 | 509 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
510 | mid->sequence_number + 1) != 0) |
511 | cERROR(1, "Unexpected SMB signature"); | |
512 | } | |
513 | ||
514 | /* BB special case reconnect tid and uid here? */ | |
515 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
516 | } | |
517 | ||
082d0642 | 518 | int |
792af7b0 PS |
519 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
520 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
521 | { | |
522 | int rc; | |
523 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
524 | struct mid_q_entry *mid; | |
525 | ||
526 | rc = allocate_mid(ses, hdr, &mid); | |
527 | if (rc) | |
528 | return rc; | |
529 | rc = cifs_sign_smb2(iov, nvec, ses->server, &mid->sequence_number); | |
530 | if (rc) | |
531 | delete_mid(mid); | |
532 | *ret_mid = mid; | |
533 | return rc; | |
534 | } | |
535 | ||
7ee1af76 | 536 | int |
96daf2b0 | 537 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 538 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 539 | const int flags) |
7ee1af76 JA |
540 | { |
541 | int rc = 0; | |
133672ef | 542 | int long_op; |
7ee1af76 | 543 | struct mid_q_entry *midQ; |
792af7b0 | 544 | char *buf = iov[0].iov_base; |
50c2f753 | 545 | |
133672ef SF |
546 | long_op = flags & CIFS_TIMEOUT_MASK; |
547 | ||
7ee1af76 JA |
548 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
549 | ||
550 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 551 | cifs_small_buf_release(buf); |
b6b38f70 | 552 | cERROR(1, "Null session"); |
7ee1af76 JA |
553 | return -EIO; |
554 | } | |
555 | ||
79a58d1f | 556 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 557 | cifs_small_buf_release(buf); |
7ee1af76 JA |
558 | return -ENOENT; |
559 | } | |
560 | ||
792af7b0 PS |
561 | /* |
562 | * Ensure that we do not send more than 50 overlapping requests | |
563 | * to the same server. We may make this configurable later or | |
564 | * use ses->maxReq. | |
565 | */ | |
7ee1af76 | 566 | |
c5797a94 | 567 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 | 568 | if (rc) { |
792af7b0 | 569 | cifs_small_buf_release(buf); |
7ee1af76 JA |
570 | return rc; |
571 | } | |
572 | ||
792af7b0 PS |
573 | /* |
574 | * Make sure that we sign in the same order that we send on this socket | |
575 | * and avoid races inside tcp sendmsg code that could cause corruption | |
576 | * of smb data. | |
577 | */ | |
7ee1af76 | 578 | |
72ca545b | 579 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 580 | |
082d0642 | 581 | rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ); |
7ee1af76 | 582 | if (rc) { |
72ca545b | 583 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 584 | cifs_small_buf_release(buf); |
7ee1af76 | 585 | /* Update # of requests on wire to server */ |
45275789 | 586 | add_credits(ses->server, 1); |
7ee1af76 | 587 | return rc; |
1da177e4 | 588 | } |
1da177e4 | 589 | |
7c9421e1 | 590 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 591 | cifs_in_send_inc(ses->server); |
0496e02d | 592 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
593 | cifs_in_send_dec(ses->server); |
594 | cifs_save_when_sent(midQ); | |
7ee1af76 | 595 | |
72ca545b | 596 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 597 | |
2db7c581 | 598 | if (rc < 0) { |
792af7b0 | 599 | cifs_small_buf_release(buf); |
7ee1af76 | 600 | goto out; |
2db7c581 | 601 | } |
4b8f930f | 602 | |
2db7c581 | 603 | if (long_op == CIFS_ASYNC_OP) { |
792af7b0 | 604 | cifs_small_buf_release(buf); |
133672ef | 605 | goto out; |
2db7c581 | 606 | } |
d6e04ae6 | 607 | |
0ade640e | 608 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 609 | if (rc != 0) { |
121b046a | 610 | send_cancel(ses->server, buf, midQ); |
1be912dd | 611 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 612 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
613 | midQ->callback = DeleteMidQEntry; |
614 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 615 | cifs_small_buf_release(buf); |
45275789 | 616 | add_credits(ses->server, 1); |
1be912dd JL |
617 | return rc; |
618 | } | |
619 | spin_unlock(&GlobalMid_Lock); | |
620 | } | |
d6e04ae6 | 621 | |
792af7b0 | 622 | cifs_small_buf_release(buf); |
2db7c581 | 623 | |
3c1105df | 624 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 625 | if (rc != 0) { |
45275789 | 626 | add_credits(ses->server, 1); |
d6e04ae6 SF |
627 | return rc; |
628 | } | |
50c2f753 | 629 | |
7c9421e1 | 630 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 631 | rc = -EIO; |
2c8f981d | 632 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
633 | goto out; |
634 | } | |
635 | ||
792af7b0 PS |
636 | buf = (char *)midQ->resp_buf; |
637 | iov[0].iov_base = buf; | |
638 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 639 | if (midQ->large_buf) |
2c8f981d JL |
640 | *pRespBufType = CIFS_LARGE_BUFFER; |
641 | else | |
642 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 643 | |
082d0642 PS |
644 | rc = ses->server->ops->check_receive(midQ, ses->server, |
645 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 646 | |
2c8f981d JL |
647 | /* mark it so buf will not be freed by delete_mid */ |
648 | if ((flags & CIFS_NO_RESP) == 0) | |
649 | midQ->resp_buf = NULL; | |
7ee1af76 | 650 | out: |
ddc8cf8f | 651 | delete_mid(midQ); |
45275789 | 652 | add_credits(ses->server, 1); |
1da177e4 | 653 | |
d6e04ae6 SF |
654 | return rc; |
655 | } | |
1da177e4 LT |
656 | |
657 | int | |
96daf2b0 | 658 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
659 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
660 | int *pbytes_returned, const int long_op) | |
661 | { | |
662 | int rc = 0; | |
1da177e4 LT |
663 | struct mid_q_entry *midQ; |
664 | ||
665 | if (ses == NULL) { | |
b6b38f70 | 666 | cERROR(1, "Null smb session"); |
1da177e4 LT |
667 | return -EIO; |
668 | } | |
79a58d1f | 669 | if (ses->server == NULL) { |
b6b38f70 | 670 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
671 | return -EIO; |
672 | } | |
673 | ||
79a58d1f | 674 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
675 | return -ENOENT; |
676 | ||
79a58d1f | 677 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
678 | to the same server. We may make this configurable later or |
679 | use ses->maxReq */ | |
1da177e4 | 680 | |
be8e3b00 SF |
681 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
682 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 683 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 684 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
685 | return -EIO; |
686 | } | |
687 | ||
c5797a94 | 688 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
689 | if (rc) |
690 | return rc; | |
691 | ||
79a58d1f | 692 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
693 | and avoid races inside tcp sendmsg code that could cause corruption |
694 | of smb data */ | |
695 | ||
72ca545b | 696 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 697 | |
7ee1af76 JA |
698 | rc = allocate_mid(ses, in_buf, &midQ); |
699 | if (rc) { | |
72ca545b | 700 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 701 | /* Update # of requests on wire to server */ |
45275789 | 702 | add_credits(ses->server, 1); |
7ee1af76 | 703 | return rc; |
1da177e4 LT |
704 | } |
705 | ||
ad009ac9 | 706 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
707 | if (rc) { |
708 | mutex_unlock(&ses->server->srv_mutex); | |
709 | goto out; | |
710 | } | |
1da177e4 | 711 | |
7c9421e1 | 712 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
713 | |
714 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 715 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
716 | cifs_in_send_dec(ses->server); |
717 | cifs_save_when_sent(midQ); | |
72ca545b | 718 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 719 | |
79a58d1f | 720 | if (rc < 0) |
7ee1af76 JA |
721 | goto out; |
722 | ||
0ade640e | 723 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 724 | goto out; |
1da177e4 | 725 | |
0ade640e | 726 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 727 | if (rc != 0) { |
121b046a | 728 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 729 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 730 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
731 | /* no longer considered to be "in-flight" */ |
732 | midQ->callback = DeleteMidQEntry; | |
733 | spin_unlock(&GlobalMid_Lock); | |
45275789 | 734 | add_credits(ses->server, 1); |
1be912dd JL |
735 | return rc; |
736 | } | |
737 | spin_unlock(&GlobalMid_Lock); | |
738 | } | |
1da177e4 | 739 | |
3c1105df | 740 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 741 | if (rc != 0) { |
45275789 | 742 | add_credits(ses->server, 1); |
1da177e4 LT |
743 | return rc; |
744 | } | |
50c2f753 | 745 | |
2c8f981d | 746 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 747 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 748 | rc = -EIO; |
b6b38f70 | 749 | cERROR(1, "Bad MID state?"); |
2c8f981d | 750 | goto out; |
1da177e4 | 751 | } |
7ee1af76 | 752 | |
d4e4854f | 753 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
754 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
755 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 756 | out: |
ddc8cf8f | 757 | delete_mid(midQ); |
45275789 | 758 | add_credits(ses->server, 1); |
1da177e4 | 759 | |
7ee1af76 JA |
760 | return rc; |
761 | } | |
1da177e4 | 762 | |
7ee1af76 JA |
763 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
764 | blocking lock to return. */ | |
765 | ||
766 | static int | |
96daf2b0 | 767 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
768 | struct smb_hdr *in_buf, |
769 | struct smb_hdr *out_buf) | |
770 | { | |
771 | int bytes_returned; | |
96daf2b0 | 772 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
773 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
774 | ||
775 | /* We just modify the current in_buf to change | |
776 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
777 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
778 | LOCKING_ANDX_CANCEL_LOCK. */ | |
779 | ||
780 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
781 | pSMB->Timeout = 0; | |
782 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
783 | ||
784 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 785 | &bytes_returned, 0); |
7ee1af76 JA |
786 | } |
787 | ||
788 | int | |
96daf2b0 | 789 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
790 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
791 | int *pbytes_returned) | |
792 | { | |
793 | int rc = 0; | |
794 | int rstart = 0; | |
7ee1af76 | 795 | struct mid_q_entry *midQ; |
96daf2b0 | 796 | struct cifs_ses *ses; |
7ee1af76 JA |
797 | |
798 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 799 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
800 | return -EIO; |
801 | } | |
802 | ses = tcon->ses; | |
803 | ||
79a58d1f | 804 | if (ses->server == NULL) { |
b6b38f70 | 805 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
806 | return -EIO; |
807 | } | |
808 | ||
79a58d1f | 809 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
810 | return -ENOENT; |
811 | ||
79a58d1f | 812 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
813 | to the same server. We may make this configurable later or |
814 | use ses->maxReq */ | |
815 | ||
be8e3b00 SF |
816 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
817 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 818 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 819 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
820 | return -EIO; |
821 | } | |
822 | ||
c5797a94 | 823 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
824 | if (rc) |
825 | return rc; | |
826 | ||
79a58d1f | 827 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
828 | and avoid races inside tcp sendmsg code that could cause corruption |
829 | of smb data */ | |
830 | ||
72ca545b | 831 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
832 | |
833 | rc = allocate_mid(ses, in_buf, &midQ); | |
834 | if (rc) { | |
72ca545b | 835 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
836 | return rc; |
837 | } | |
838 | ||
7ee1af76 | 839 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 840 | if (rc) { |
ddc8cf8f | 841 | delete_mid(midQ); |
829049cb VL |
842 | mutex_unlock(&ses->server->srv_mutex); |
843 | return rc; | |
844 | } | |
1da177e4 | 845 | |
7c9421e1 | 846 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 847 | cifs_in_send_inc(ses->server); |
be8e3b00 | 848 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
849 | cifs_in_send_dec(ses->server); |
850 | cifs_save_when_sent(midQ); | |
72ca545b | 851 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 852 | |
79a58d1f | 853 | if (rc < 0) { |
ddc8cf8f | 854 | delete_mid(midQ); |
7ee1af76 JA |
855 | return rc; |
856 | } | |
857 | ||
858 | /* Wait for a reply - allow signals to interrupt. */ | |
859 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 860 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
861 | ((ses->server->tcpStatus != CifsGood) && |
862 | (ses->server->tcpStatus != CifsNew))); | |
863 | ||
864 | /* Were we interrupted by a signal ? */ | |
865 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 866 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
867 | ((ses->server->tcpStatus == CifsGood) || |
868 | (ses->server->tcpStatus == CifsNew))) { | |
869 | ||
870 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
871 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
872 | blocking lock to return. */ | |
121b046a | 873 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 874 | if (rc) { |
ddc8cf8f | 875 | delete_mid(midQ); |
7ee1af76 JA |
876 | return rc; |
877 | } | |
878 | } else { | |
879 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
880 | to cause the blocking lock to return. */ | |
881 | ||
882 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
883 | ||
884 | /* If we get -ENOLCK back the lock may have | |
885 | already been removed. Don't exit in this case. */ | |
886 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 887 | delete_mid(midQ); |
7ee1af76 JA |
888 | return rc; |
889 | } | |
890 | } | |
891 | ||
1be912dd JL |
892 | rc = wait_for_response(ses->server, midQ); |
893 | if (rc) { | |
121b046a | 894 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 895 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 896 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
897 | /* no longer considered to be "in-flight" */ |
898 | midQ->callback = DeleteMidQEntry; | |
899 | spin_unlock(&GlobalMid_Lock); | |
900 | return rc; | |
901 | } | |
902 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 903 | } |
1be912dd JL |
904 | |
905 | /* We got the response - restart system call. */ | |
906 | rstart = 1; | |
7ee1af76 JA |
907 | } |
908 | ||
3c1105df | 909 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 910 | if (rc != 0) |
7ee1af76 | 911 | return rc; |
50c2f753 | 912 | |
17c8bfed | 913 | /* rcvd frame is ok */ |
7c9421e1 | 914 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 915 | rc = -EIO; |
b6b38f70 | 916 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
917 | goto out; |
918 | } | |
1da177e4 | 919 | |
d4e4854f | 920 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
921 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
922 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 923 | out: |
ddc8cf8f | 924 | delete_mid(midQ); |
7ee1af76 JA |
925 | if (rstart && rc == -EACCES) |
926 | return -ERESTARTSYS; | |
1da177e4 LT |
927 | return rc; |
928 | } |