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CIFS: Add rwpidforward mount option
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob21bc83586beb1cafd8b31c0d39536d4663242cca
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <net/ipv6.h>
41 #include "cifspdu.h"
42 #include "cifsglob.h"
43 #include "cifsproto.h"
44 #include "cifs_unicode.h"
45 #include "cifs_debug.h"
46 #include "cifs_fs_sb.h"
47 #include "ntlmssp.h"
48 #include "nterr.h"
49 #include "rfc1002pdu.h"
50 #include "fscache.h"
51
52 #define CIFS_PORT 445
53 #define RFC1001_PORT 139
54
55 /* SMB echo "timeout" -- FIXME: tunable? */
56 #define SMB_ECHO_INTERVAL (60 * HZ)
57
58 extern mempool_t *cifs_req_poolp;
59
60 /* FIXME: should these be tunable? */
61 #define TLINK_ERROR_EXPIRE (1 * HZ)
62 #define TLINK_IDLE_EXPIRE (600 * HZ)
63
64 static int ip_connect(struct TCP_Server_Info *server);
65 static int generic_ip_connect(struct TCP_Server_Info *server);
66 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
67 static void cifs_prune_tlinks(struct work_struct *work);
68
69 /*
70 * cifs tcp session reconnection
71 *
72 * mark tcp session as reconnecting so temporarily locked
73 * mark all smb sessions as reconnecting for tcp session
74 * reconnect tcp session
75 * wake up waiters on reconnection? - (not needed currently)
76 */
77 static int
78 cifs_reconnect(struct TCP_Server_Info *server)
79 {
80 int rc = 0;
81 struct list_head *tmp, *tmp2;
82 struct cifsSesInfo *ses;
83 struct cifsTconInfo *tcon;
84 struct mid_q_entry *mid_entry;
85 struct list_head retry_list;
86
87 spin_lock(&GlobalMid_Lock);
88 if (server->tcpStatus == CifsExiting) {
89 /* the demux thread will exit normally
90 next time through the loop */
91 spin_unlock(&GlobalMid_Lock);
92 return rc;
93 } else
94 server->tcpStatus = CifsNeedReconnect;
95 spin_unlock(&GlobalMid_Lock);
96 server->maxBuf = 0;
97
98 cFYI(1, "Reconnecting tcp session");
99
100 /* before reconnecting the tcp session, mark the smb session (uid)
101 and the tid bad so they are not used until reconnected */
102 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
103 spin_lock(&cifs_tcp_ses_lock);
104 list_for_each(tmp, &server->smb_ses_list) {
105 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
106 ses->need_reconnect = true;
107 ses->ipc_tid = 0;
108 list_for_each(tmp2, &ses->tcon_list) {
109 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
110 tcon->need_reconnect = true;
111 }
112 }
113 spin_unlock(&cifs_tcp_ses_lock);
114
115 /* do not want to be sending data on a socket we are freeing */
116 cFYI(1, "%s: tearing down socket", __func__);
117 mutex_lock(&server->srv_mutex);
118 if (server->ssocket) {
119 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
120 server->ssocket->flags);
121 kernel_sock_shutdown(server->ssocket, SHUT_WR);
122 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
123 server->ssocket->state,
124 server->ssocket->flags);
125 sock_release(server->ssocket);
126 server->ssocket = NULL;
127 }
128 server->sequence_number = 0;
129 server->session_estab = false;
130 kfree(server->session_key.response);
131 server->session_key.response = NULL;
132 server->session_key.len = 0;
133 server->lstrp = jiffies;
134 mutex_unlock(&server->srv_mutex);
135
136 /* mark submitted MIDs for retry and issue callback */
137 INIT_LIST_HEAD(&retry_list);
138 cFYI(1, "%s: moving mids to private list", __func__);
139 spin_lock(&GlobalMid_Lock);
140 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
141 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
142 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
143 mid_entry->midState = MID_RETRY_NEEDED;
144 list_move(&mid_entry->qhead, &retry_list);
145 }
146 spin_unlock(&GlobalMid_Lock);
147
148 cFYI(1, "%s: issuing mid callbacks", __func__);
149 list_for_each_safe(tmp, tmp2, &retry_list) {
150 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
151 list_del_init(&mid_entry->qhead);
152 mid_entry->callback(mid_entry);
153 }
154
155 while (server->tcpStatus == CifsNeedReconnect) {
156 try_to_freeze();
157
158 /* we should try only the port we connected to before */
159 rc = generic_ip_connect(server);
160 if (rc) {
161 cFYI(1, "reconnect error %d", rc);
162 msleep(3000);
163 } else {
164 atomic_inc(&tcpSesReconnectCount);
165 spin_lock(&GlobalMid_Lock);
166 if (server->tcpStatus != CifsExiting)
167 server->tcpStatus = CifsNeedNegotiate;
168 spin_unlock(&GlobalMid_Lock);
169 }
170 }
171
172 return rc;
173 }
174
175 /*
176 return codes:
177 0 not a transact2, or all data present
178 >0 transact2 with that much data missing
179 -EINVAL = invalid transact2
180
181 */
182 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
183 {
184 struct smb_t2_rsp *pSMBt;
185 int remaining;
186 __u16 total_data_size, data_in_this_rsp;
187
188 if (pSMB->Command != SMB_COM_TRANSACTION2)
189 return 0;
190
191 /* check for plausible wct, bcc and t2 data and parm sizes */
192 /* check for parm and data offset going beyond end of smb */
193 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
194 cFYI(1, "invalid transact2 word count");
195 return -EINVAL;
196 }
197
198 pSMBt = (struct smb_t2_rsp *)pSMB;
199
200 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
201 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
202
203 if (total_data_size == data_in_this_rsp)
204 return 0;
205 else if (total_data_size < data_in_this_rsp) {
206 cFYI(1, "total data %d smaller than data in frame %d",
207 total_data_size, data_in_this_rsp);
208 return -EINVAL;
209 }
210
211 remaining = total_data_size - data_in_this_rsp;
212
213 cFYI(1, "missing %d bytes from transact2, check next response",
214 remaining);
215 if (total_data_size > maxBufSize) {
216 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
217 total_data_size, maxBufSize);
218 return -EINVAL;
219 }
220 return remaining;
221 }
222
223 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
224 {
225 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
226 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
227 char *data_area_of_target;
228 char *data_area_of_buf2;
229 int remaining;
230 unsigned int byte_count, total_in_buf;
231 __u16 total_data_size, total_in_buf2;
232
233 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
234
235 if (total_data_size !=
236 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
237 cFYI(1, "total data size of primary and secondary t2 differ");
238
239 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
240
241 remaining = total_data_size - total_in_buf;
242
243 if (remaining < 0)
244 return -EPROTO;
245
246 if (remaining == 0) /* nothing to do, ignore */
247 return 0;
248
249 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
250 if (remaining < total_in_buf2) {
251 cFYI(1, "transact2 2nd response contains too much data");
252 }
253
254 /* find end of first SMB data area */
255 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
256 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
257 /* validate target area */
258
259 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
260 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
261
262 data_area_of_target += total_in_buf;
263
264 /* copy second buffer into end of first buffer */
265 total_in_buf += total_in_buf2;
266 /* is the result too big for the field? */
267 if (total_in_buf > USHRT_MAX)
268 return -EPROTO;
269 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
270
271 /* fix up the BCC */
272 byte_count = get_bcc(pTargetSMB);
273 byte_count += total_in_buf2;
274 /* is the result too big for the field? */
275 if (byte_count > USHRT_MAX)
276 return -EPROTO;
277 put_bcc(byte_count, pTargetSMB);
278
279 byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
280 byte_count += total_in_buf2;
281 /* don't allow buffer to overflow */
282 if (byte_count > CIFSMaxBufSize)
283 return -ENOBUFS;
284 pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
285
286 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
287
288 if (remaining == total_in_buf2) {
289 cFYI(1, "found the last secondary response");
290 return 0; /* we are done */
291 } else /* more responses to go */
292 return 1;
293 }
294
295 static void
296 cifs_echo_request(struct work_struct *work)
297 {
298 int rc;
299 struct TCP_Server_Info *server = container_of(work,
300 struct TCP_Server_Info, echo.work);
301
302 /*
303 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
304 * done, which is indicated by maxBuf != 0. Also, no need to ping if
305 * we got a response recently
306 */
307 if (server->maxBuf == 0 ||
308 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
309 goto requeue_echo;
310
311 rc = CIFSSMBEcho(server);
312 if (rc)
313 cFYI(1, "Unable to send echo request to server: %s",
314 server->hostname);
315
316 requeue_echo:
317 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
318 }
319
320 static int
321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
322 {
323 int length;
324 unsigned int pdu_length, total_read;
325 struct smb_hdr *smb_buffer = NULL;
326 struct smb_hdr *bigbuf = NULL;
327 struct smb_hdr *smallbuf = NULL;
328 struct msghdr smb_msg;
329 struct kvec iov;
330 struct socket *csocket = server->ssocket;
331 struct list_head *tmp, *tmp2;
332 struct task_struct *task_to_wake = NULL;
333 struct mid_q_entry *mid_entry;
334 char temp;
335 bool isLargeBuf = false;
336 bool isMultiRsp;
337 int reconnect;
338
339 current->flags |= PF_MEMALLOC;
340 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
341
342 length = atomic_inc_return(&tcpSesAllocCount);
343 if (length > 1)
344 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
345 GFP_KERNEL);
346
347 set_freezable();
348 while (server->tcpStatus != CifsExiting) {
349 if (try_to_freeze())
350 continue;
351 if (bigbuf == NULL) {
352 bigbuf = cifs_buf_get();
353 if (!bigbuf) {
354 cERROR(1, "No memory for large SMB response");
355 msleep(3000);
356 /* retry will check if exiting */
357 continue;
358 }
359 } else if (isLargeBuf) {
360 /* we are reusing a dirty large buf, clear its start */
361 memset(bigbuf, 0, sizeof(struct smb_hdr));
362 }
363
364 if (smallbuf == NULL) {
365 smallbuf = cifs_small_buf_get();
366 if (!smallbuf) {
367 cERROR(1, "No memory for SMB response");
368 msleep(1000);
369 /* retry will check if exiting */
370 continue;
371 }
372 /* beginning of smb buffer is cleared in our buf_get */
373 } else /* if existing small buf clear beginning */
374 memset(smallbuf, 0, sizeof(struct smb_hdr));
375
376 isLargeBuf = false;
377 isMultiRsp = false;
378 smb_buffer = smallbuf;
379 iov.iov_base = smb_buffer;
380 iov.iov_len = 4;
381 smb_msg.msg_control = NULL;
382 smb_msg.msg_controllen = 0;
383 pdu_length = 4; /* enough to get RFC1001 header */
384
385 incomplete_rcv:
386 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
387 time_after(jiffies, server->lstrp +
388 (echo_retries * SMB_ECHO_INTERVAL))) {
389 cERROR(1, "Server %s has not responded in %d seconds. "
390 "Reconnecting...", server->hostname,
391 (echo_retries * SMB_ECHO_INTERVAL / HZ));
392 cifs_reconnect(server);
393 csocket = server->ssocket;
394 wake_up(&server->response_q);
395 continue;
396 }
397
398 length =
399 kernel_recvmsg(csocket, &smb_msg,
400 &iov, 1, pdu_length, 0 /* BB other flags? */);
401
402 if (server->tcpStatus == CifsExiting) {
403 break;
404 } else if (server->tcpStatus == CifsNeedReconnect) {
405 cFYI(1, "Reconnect after server stopped responding");
406 cifs_reconnect(server);
407 cFYI(1, "call to reconnect done");
408 csocket = server->ssocket;
409 continue;
410 } else if (length == -ERESTARTSYS ||
411 length == -EAGAIN ||
412 length == -EINTR) {
413 msleep(1); /* minimum sleep to prevent looping
414 allowing socket to clear and app threads to set
415 tcpStatus CifsNeedReconnect if server hung */
416 if (pdu_length < 4) {
417 iov.iov_base = (4 - pdu_length) +
418 (char *)smb_buffer;
419 iov.iov_len = pdu_length;
420 smb_msg.msg_control = NULL;
421 smb_msg.msg_controllen = 0;
422 goto incomplete_rcv;
423 } else
424 continue;
425 } else if (length <= 0) {
426 cFYI(1, "Reconnect after unexpected peek error %d",
427 length);
428 cifs_reconnect(server);
429 csocket = server->ssocket;
430 wake_up(&server->response_q);
431 continue;
432 } else if (length < pdu_length) {
433 cFYI(1, "requested %d bytes but only got %d bytes",
434 pdu_length, length);
435 pdu_length -= length;
436 msleep(1);
437 goto incomplete_rcv;
438 }
439
440 /* The right amount was read from socket - 4 bytes */
441 /* so we can now interpret the length field */
442
443 /* the first byte big endian of the length field,
444 is actually not part of the length but the type
445 with the most common, zero, as regular data */
446 temp = *((char *) smb_buffer);
447
448 /* Note that FC 1001 length is big endian on the wire,
449 but we convert it here so it is always manipulated
450 as host byte order */
451 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
452
453 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
454
455 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
456 continue;
457 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
458 cFYI(1, "Good RFC 1002 session rsp");
459 continue;
460 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
461 /* we get this from Windows 98 instead of
462 an error on SMB negprot response */
463 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
464 pdu_length);
465 /* give server a second to clean up */
466 msleep(1000);
467 /* always try 445 first on reconnect since we get NACK
468 * on some if we ever connected to port 139 (the NACK
469 * is since we do not begin with RFC1001 session
470 * initialize frame)
471 */
472 cifs_set_port((struct sockaddr *)
473 &server->dstaddr, CIFS_PORT);
474 cifs_reconnect(server);
475 csocket = server->ssocket;
476 wake_up(&server->response_q);
477 continue;
478 } else if (temp != (char) 0) {
479 cERROR(1, "Unknown RFC 1002 frame");
480 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
481 length);
482 cifs_reconnect(server);
483 csocket = server->ssocket;
484 continue;
485 }
486
487 /* else we have an SMB response */
488 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
489 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
490 cERROR(1, "Invalid size SMB length %d pdu_length %d",
491 length, pdu_length+4);
492 cifs_reconnect(server);
493 csocket = server->ssocket;
494 wake_up(&server->response_q);
495 continue;
496 }
497
498 /* else length ok */
499 reconnect = 0;
500
501 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
502 isLargeBuf = true;
503 memcpy(bigbuf, smallbuf, 4);
504 smb_buffer = bigbuf;
505 }
506 length = 0;
507 iov.iov_base = 4 + (char *)smb_buffer;
508 iov.iov_len = pdu_length;
509 for (total_read = 0; total_read < pdu_length;
510 total_read += length) {
511 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
512 pdu_length - total_read, 0);
513 if (server->tcpStatus == CifsExiting) {
514 /* then will exit */
515 reconnect = 2;
516 break;
517 } else if (server->tcpStatus == CifsNeedReconnect) {
518 cifs_reconnect(server);
519 csocket = server->ssocket;
520 /* Reconnect wakes up rspns q */
521 /* Now we will reread sock */
522 reconnect = 1;
523 break;
524 } else if (length == -ERESTARTSYS ||
525 length == -EAGAIN ||
526 length == -EINTR) {
527 msleep(1); /* minimum sleep to prevent looping,
528 allowing socket to clear and app
529 threads to set tcpStatus
530 CifsNeedReconnect if server hung*/
531 length = 0;
532 continue;
533 } else if (length <= 0) {
534 cERROR(1, "Received no data, expecting %d",
535 pdu_length - total_read);
536 cifs_reconnect(server);
537 csocket = server->ssocket;
538 reconnect = 1;
539 break;
540 }
541 }
542 if (reconnect == 2)
543 break;
544 else if (reconnect == 1)
545 continue;
546
547 total_read += 4; /* account for rfc1002 hdr */
548
549 dump_smb(smb_buffer, total_read);
550
551 /*
552 * We know that we received enough to get to the MID as we
553 * checked the pdu_length earlier. Now check to see
554 * if the rest of the header is OK. We borrow the length
555 * var for the rest of the loop to avoid a new stack var.
556 *
557 * 48 bytes is enough to display the header and a little bit
558 * into the payload for debugging purposes.
559 */
560 length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
561 if (length != 0)
562 cifs_dump_mem("Bad SMB: ", smb_buffer,
563 min_t(unsigned int, total_read, 48));
564
565 mid_entry = NULL;
566 server->lstrp = jiffies;
567
568 spin_lock(&GlobalMid_Lock);
569 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
570 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
571
572 if (mid_entry->mid != smb_buffer->Mid ||
573 mid_entry->midState != MID_REQUEST_SUBMITTED ||
574 mid_entry->command != smb_buffer->Command) {
575 mid_entry = NULL;
576 continue;
577 }
578
579 if (length == 0 &&
580 check2ndT2(smb_buffer, server->maxBuf) > 0) {
581 /* We have a multipart transact2 resp */
582 isMultiRsp = true;
583 if (mid_entry->resp_buf) {
584 /* merge response - fix up 1st*/
585 length = coalesce_t2(smb_buffer,
586 mid_entry->resp_buf);
587 if (length > 0) {
588 length = 0;
589 mid_entry->multiRsp = true;
590 break;
591 } else {
592 /* all parts received or
593 * packet is malformed
594 */
595 mid_entry->multiEnd = true;
596 goto multi_t2_fnd;
597 }
598 } else {
599 if (!isLargeBuf) {
600 /*
601 * FIXME: switch to already
602 * allocated largebuf?
603 */
604 cERROR(1, "1st trans2 resp "
605 "needs bigbuf");
606 } else {
607 /* Have first buffer */
608 mid_entry->resp_buf =
609 smb_buffer;
610 mid_entry->largeBuf = true;
611 bigbuf = NULL;
612 }
613 }
614 break;
615 }
616 mid_entry->resp_buf = smb_buffer;
617 mid_entry->largeBuf = isLargeBuf;
618 multi_t2_fnd:
619 if (length == 0)
620 mid_entry->midState = MID_RESPONSE_RECEIVED;
621 else
622 mid_entry->midState = MID_RESPONSE_MALFORMED;
623 #ifdef CONFIG_CIFS_STATS2
624 mid_entry->when_received = jiffies;
625 #endif
626 list_del_init(&mid_entry->qhead);
627 break;
628 }
629 spin_unlock(&GlobalMid_Lock);
630
631 if (mid_entry != NULL) {
632 mid_entry->callback(mid_entry);
633 /* Was previous buf put in mpx struct for multi-rsp? */
634 if (!isMultiRsp) {
635 /* smb buffer will be freed by user thread */
636 if (isLargeBuf)
637 bigbuf = NULL;
638 else
639 smallbuf = NULL;
640 }
641 } else if (length != 0) {
642 /* response sanity checks failed */
643 continue;
644 } else if (!is_valid_oplock_break(smb_buffer, server) &&
645 !isMultiRsp) {
646 cERROR(1, "No task to wake, unknown frame received! "
647 "NumMids %d", atomic_read(&midCount));
648 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
649 sizeof(struct smb_hdr));
650 #ifdef CONFIG_CIFS_DEBUG2
651 cifs_dump_detail(smb_buffer);
652 cifs_dump_mids(server);
653 #endif /* CIFS_DEBUG2 */
654
655 }
656 } /* end while !EXITING */
657
658 /* take it off the list, if it's not already */
659 spin_lock(&cifs_tcp_ses_lock);
660 list_del_init(&server->tcp_ses_list);
661 spin_unlock(&cifs_tcp_ses_lock);
662
663 spin_lock(&GlobalMid_Lock);
664 server->tcpStatus = CifsExiting;
665 spin_unlock(&GlobalMid_Lock);
666 wake_up_all(&server->response_q);
667
668 /* check if we have blocked requests that need to free */
669 /* Note that cifs_max_pending is normally 50, but
670 can be set at module install time to as little as two */
671 spin_lock(&GlobalMid_Lock);
672 if (atomic_read(&server->inFlight) >= cifs_max_pending)
673 atomic_set(&server->inFlight, cifs_max_pending - 1);
674 /* We do not want to set the max_pending too low or we
675 could end up with the counter going negative */
676 spin_unlock(&GlobalMid_Lock);
677 /* Although there should not be any requests blocked on
678 this queue it can not hurt to be paranoid and try to wake up requests
679 that may haven been blocked when more than 50 at time were on the wire
680 to the same server - they now will see the session is in exit state
681 and get out of SendReceive. */
682 wake_up_all(&server->request_q);
683 /* give those requests time to exit */
684 msleep(125);
685
686 if (server->ssocket) {
687 sock_release(csocket);
688 server->ssocket = NULL;
689 }
690 /* buffer usually freed in free_mid - need to free it here on exit */
691 cifs_buf_release(bigbuf);
692 if (smallbuf) /* no sense logging a debug message if NULL */
693 cifs_small_buf_release(smallbuf);
694
695 if (!list_empty(&server->pending_mid_q)) {
696 struct list_head dispose_list;
697
698 INIT_LIST_HEAD(&dispose_list);
699 spin_lock(&GlobalMid_Lock);
700 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
701 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
702 cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
703 mid_entry->midState = MID_SHUTDOWN;
704 list_move(&mid_entry->qhead, &dispose_list);
705 }
706 spin_unlock(&GlobalMid_Lock);
707
708 /* now walk dispose list and issue callbacks */
709 list_for_each_safe(tmp, tmp2, &dispose_list) {
710 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
711 cFYI(1, "Callback mid 0x%x", mid_entry->mid);
712 list_del_init(&mid_entry->qhead);
713 mid_entry->callback(mid_entry);
714 }
715 /* 1/8th of sec is more than enough time for them to exit */
716 msleep(125);
717 }
718
719 if (!list_empty(&server->pending_mid_q)) {
720 /* mpx threads have not exited yet give them
721 at least the smb send timeout time for long ops */
722 /* due to delays on oplock break requests, we need
723 to wait at least 45 seconds before giving up
724 on a request getting a response and going ahead
725 and killing cifsd */
726 cFYI(1, "Wait for exit from demultiplex thread");
727 msleep(46000);
728 /* if threads still have not exited they are probably never
729 coming home not much else we can do but free the memory */
730 }
731
732 kfree(server->hostname);
733 task_to_wake = xchg(&server->tsk, NULL);
734 kfree(server);
735
736 length = atomic_dec_return(&tcpSesAllocCount);
737 if (length > 0)
738 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
739 GFP_KERNEL);
740
741 /* if server->tsk was NULL then wait for a signal before exiting */
742 if (!task_to_wake) {
743 set_current_state(TASK_INTERRUPTIBLE);
744 while (!signal_pending(current)) {
745 schedule();
746 set_current_state(TASK_INTERRUPTIBLE);
747 }
748 set_current_state(TASK_RUNNING);
749 }
750
751 module_put_and_exit(0);
752 }
753
754 /* extract the host portion of the UNC string */
755 static char *
756 extract_hostname(const char *unc)
757 {
758 const char *src;
759 char *dst, *delim;
760 unsigned int len;
761
762 /* skip double chars at beginning of string */
763 /* BB: check validity of these bytes? */
764 src = unc + 2;
765
766 /* delimiter between hostname and sharename is always '\\' now */
767 delim = strchr(src, '\\');
768 if (!delim)
769 return ERR_PTR(-EINVAL);
770
771 len = delim - src;
772 dst = kmalloc((len + 1), GFP_KERNEL);
773 if (dst == NULL)
774 return ERR_PTR(-ENOMEM);
775
776 memcpy(dst, src, len);
777 dst[len] = '\0';
778
779 return dst;
780 }
781
782 static int
783 cifs_parse_mount_options(const char *mountdata, const char *devname,
784 struct smb_vol *vol)
785 {
786 char *value, *data, *end;
787 char *mountdata_copy, *options;
788 unsigned int temp_len, i, j;
789 char separator[2];
790 short int override_uid = -1;
791 short int override_gid = -1;
792 bool uid_specified = false;
793 bool gid_specified = false;
794 char *nodename = utsname()->nodename;
795
796 separator[0] = ',';
797 separator[1] = 0;
798
799 /*
800 * does not have to be perfect mapping since field is
801 * informational, only used for servers that do not support
802 * port 445 and it can be overridden at mount time
803 */
804 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
805 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
806 vol->source_rfc1001_name[i] = toupper(nodename[i]);
807
808 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
809 /* null target name indicates to use *SMBSERVR default called name
810 if we end up sending RFC1001 session initialize */
811 vol->target_rfc1001_name[0] = 0;
812 vol->cred_uid = current_uid();
813 vol->linux_uid = current_uid();
814 vol->linux_gid = current_gid();
815
816 /* default to only allowing write access to owner of the mount */
817 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
818
819 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
820 /* default is always to request posix paths. */
821 vol->posix_paths = 1;
822 /* default to using server inode numbers where available */
823 vol->server_ino = 1;
824
825 vol->actimeo = CIFS_DEF_ACTIMEO;
826
827 if (!mountdata)
828 goto cifs_parse_mount_err;
829
830 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
831 if (!mountdata_copy)
832 goto cifs_parse_mount_err;
833
834 options = mountdata_copy;
835 end = options + strlen(options);
836 if (strncmp(options, "sep=", 4) == 0) {
837 if (options[4] != 0) {
838 separator[0] = options[4];
839 options += 5;
840 } else {
841 cFYI(1, "Null separator not allowed");
842 }
843 }
844
845 while ((data = strsep(&options, separator)) != NULL) {
846 if (!*data)
847 continue;
848 if ((value = strchr(data, '=')) != NULL)
849 *value++ = '\0';
850
851 /* Have to parse this before we parse for "user" */
852 if (strnicmp(data, "user_xattr", 10) == 0) {
853 vol->no_xattr = 0;
854 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
855 vol->no_xattr = 1;
856 } else if (strnicmp(data, "user", 4) == 0) {
857 if (!value) {
858 printk(KERN_WARNING
859 "CIFS: invalid or missing username\n");
860 goto cifs_parse_mount_err;
861 } else if (!*value) {
862 /* null user, ie anonymous, authentication */
863 vol->nullauth = 1;
864 }
865 if (strnlen(value, MAX_USERNAME_SIZE) <
866 MAX_USERNAME_SIZE) {
867 vol->username = kstrdup(value, GFP_KERNEL);
868 if (!vol->username) {
869 printk(KERN_WARNING "CIFS: no memory "
870 "for username\n");
871 goto cifs_parse_mount_err;
872 }
873 } else {
874 printk(KERN_WARNING "CIFS: username too long\n");
875 goto cifs_parse_mount_err;
876 }
877 } else if (strnicmp(data, "pass", 4) == 0) {
878 if (!value) {
879 vol->password = NULL;
880 continue;
881 } else if (value[0] == 0) {
882 /* check if string begins with double comma
883 since that would mean the password really
884 does start with a comma, and would not
885 indicate an empty string */
886 if (value[1] != separator[0]) {
887 vol->password = NULL;
888 continue;
889 }
890 }
891 temp_len = strlen(value);
892 /* removed password length check, NTLM passwords
893 can be arbitrarily long */
894
895 /* if comma in password, the string will be
896 prematurely null terminated. Commas in password are
897 specified across the cifs mount interface by a double
898 comma ie ,, and a comma used as in other cases ie ','
899 as a parameter delimiter/separator is single and due
900 to the strsep above is temporarily zeroed. */
901
902 /* NB: password legally can have multiple commas and
903 the only illegal character in a password is null */
904
905 if ((value[temp_len] == 0) &&
906 (value + temp_len < end) &&
907 (value[temp_len+1] == separator[0])) {
908 /* reinsert comma */
909 value[temp_len] = separator[0];
910 temp_len += 2; /* move after second comma */
911 while (value[temp_len] != 0) {
912 if (value[temp_len] == separator[0]) {
913 if (value[temp_len+1] ==
914 separator[0]) {
915 /* skip second comma */
916 temp_len++;
917 } else {
918 /* single comma indicating start
919 of next parm */
920 break;
921 }
922 }
923 temp_len++;
924 }
925 if (value[temp_len] == 0) {
926 options = NULL;
927 } else {
928 value[temp_len] = 0;
929 /* point option to start of next parm */
930 options = value + temp_len + 1;
931 }
932 /* go from value to value + temp_len condensing
933 double commas to singles. Note that this ends up
934 allocating a few bytes too many, which is ok */
935 vol->password = kzalloc(temp_len, GFP_KERNEL);
936 if (vol->password == NULL) {
937 printk(KERN_WARNING "CIFS: no memory "
938 "for password\n");
939 goto cifs_parse_mount_err;
940 }
941 for (i = 0, j = 0; i < temp_len; i++, j++) {
942 vol->password[j] = value[i];
943 if (value[i] == separator[0]
944 && value[i+1] == separator[0]) {
945 /* skip second comma */
946 i++;
947 }
948 }
949 vol->password[j] = 0;
950 } else {
951 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
952 if (vol->password == NULL) {
953 printk(KERN_WARNING "CIFS: no memory "
954 "for password\n");
955 goto cifs_parse_mount_err;
956 }
957 strcpy(vol->password, value);
958 }
959 } else if (!strnicmp(data, "ip", 2) ||
960 !strnicmp(data, "addr", 4)) {
961 if (!value || !*value) {
962 vol->UNCip = NULL;
963 } else if (strnlen(value, INET6_ADDRSTRLEN) <
964 INET6_ADDRSTRLEN) {
965 vol->UNCip = kstrdup(value, GFP_KERNEL);
966 if (!vol->UNCip) {
967 printk(KERN_WARNING "CIFS: no memory "
968 "for UNC IP\n");
969 goto cifs_parse_mount_err;
970 }
971 } else {
972 printk(KERN_WARNING "CIFS: ip address "
973 "too long\n");
974 goto cifs_parse_mount_err;
975 }
976 } else if (strnicmp(data, "sec", 3) == 0) {
977 if (!value || !*value) {
978 cERROR(1, "no security value specified");
979 continue;
980 } else if (strnicmp(value, "krb5i", 5) == 0) {
981 vol->secFlg |= CIFSSEC_MAY_KRB5 |
982 CIFSSEC_MUST_SIGN;
983 } else if (strnicmp(value, "krb5p", 5) == 0) {
984 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
985 CIFSSEC_MAY_KRB5; */
986 cERROR(1, "Krb5 cifs privacy not supported");
987 goto cifs_parse_mount_err;
988 } else if (strnicmp(value, "krb5", 4) == 0) {
989 vol->secFlg |= CIFSSEC_MAY_KRB5;
990 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
991 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
992 CIFSSEC_MUST_SIGN;
993 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
994 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
995 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
996 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
997 CIFSSEC_MUST_SIGN;
998 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1000 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1001 vol->secFlg |= CIFSSEC_MAY_NTLM |
1002 CIFSSEC_MUST_SIGN;
1003 } else if (strnicmp(value, "ntlm", 4) == 0) {
1004 /* ntlm is default so can be turned off too */
1005 vol->secFlg |= CIFSSEC_MAY_NTLM;
1006 } else if (strnicmp(value, "nontlm", 6) == 0) {
1007 /* BB is there a better way to do this? */
1008 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1009 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1010 } else if (strnicmp(value, "lanman", 6) == 0) {
1011 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1012 #endif
1013 } else if (strnicmp(value, "none", 4) == 0) {
1014 vol->nullauth = 1;
1015 } else {
1016 cERROR(1, "bad security option: %s", value);
1017 goto cifs_parse_mount_err;
1018 }
1019 } else if (strnicmp(data, "vers", 3) == 0) {
1020 if (!value || !*value) {
1021 cERROR(1, "no protocol version specified"
1022 " after vers= mount option");
1023 } else if ((strnicmp(value, "cifs", 4) == 0) ||
1024 (strnicmp(value, "1", 1) == 0)) {
1025 /* this is the default */
1026 continue;
1027 }
1028 } else if ((strnicmp(data, "unc", 3) == 0)
1029 || (strnicmp(data, "target", 6) == 0)
1030 || (strnicmp(data, "path", 4) == 0)) {
1031 if (!value || !*value) {
1032 printk(KERN_WARNING "CIFS: invalid path to "
1033 "network resource\n");
1034 goto cifs_parse_mount_err;
1035 }
1036 if ((temp_len = strnlen(value, 300)) < 300) {
1037 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1038 if (vol->UNC == NULL)
1039 goto cifs_parse_mount_err;
1040 strcpy(vol->UNC, value);
1041 if (strncmp(vol->UNC, "//", 2) == 0) {
1042 vol->UNC[0] = '\\';
1043 vol->UNC[1] = '\\';
1044 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1045 printk(KERN_WARNING
1046 "CIFS: UNC Path does not begin "
1047 "with // or \\\\ \n");
1048 goto cifs_parse_mount_err;
1049 }
1050 } else {
1051 printk(KERN_WARNING "CIFS: UNC name too long\n");
1052 goto cifs_parse_mount_err;
1053 }
1054 } else if ((strnicmp(data, "domain", 3) == 0)
1055 || (strnicmp(data, "workgroup", 5) == 0)) {
1056 if (!value || !*value) {
1057 printk(KERN_WARNING "CIFS: invalid domain name\n");
1058 goto cifs_parse_mount_err;
1059 }
1060 /* BB are there cases in which a comma can be valid in
1061 a domain name and need special handling? */
1062 if (strnlen(value, 256) < 256) {
1063 vol->domainname = kstrdup(value, GFP_KERNEL);
1064 if (!vol->domainname) {
1065 printk(KERN_WARNING "CIFS: no memory "
1066 "for domainname\n");
1067 goto cifs_parse_mount_err;
1068 }
1069 cFYI(1, "Domain name set");
1070 } else {
1071 printk(KERN_WARNING "CIFS: domain name too "
1072 "long\n");
1073 goto cifs_parse_mount_err;
1074 }
1075 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1076 vol->srcaddr.ss_family = AF_UNSPEC;
1077
1078 if (!value || !*value) {
1079 printk(KERN_WARNING "CIFS: srcaddr value"
1080 " not specified.\n");
1081 goto cifs_parse_mount_err;
1082 }
1083 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1084 value, strlen(value));
1085 if (i == 0) {
1086 printk(KERN_WARNING "CIFS: Could not parse"
1087 " srcaddr: %s\n",
1088 value);
1089 goto cifs_parse_mount_err;
1090 }
1091 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1092 if (!value || !*value) {
1093 printk(KERN_WARNING
1094 "CIFS: invalid path prefix\n");
1095 goto cifs_parse_mount_err;
1096 }
1097 if ((temp_len = strnlen(value, 1024)) < 1024) {
1098 if (value[0] != '/')
1099 temp_len++; /* missing leading slash */
1100 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1101 if (vol->prepath == NULL)
1102 goto cifs_parse_mount_err;
1103 if (value[0] != '/') {
1104 vol->prepath[0] = '/';
1105 strcpy(vol->prepath+1, value);
1106 } else
1107 strcpy(vol->prepath, value);
1108 cFYI(1, "prefix path %s", vol->prepath);
1109 } else {
1110 printk(KERN_WARNING "CIFS: prefix too long\n");
1111 goto cifs_parse_mount_err;
1112 }
1113 } else if (strnicmp(data, "iocharset", 9) == 0) {
1114 if (!value || !*value) {
1115 printk(KERN_WARNING "CIFS: invalid iocharset "
1116 "specified\n");
1117 goto cifs_parse_mount_err;
1118 }
1119 if (strnlen(value, 65) < 65) {
1120 if (strnicmp(value, "default", 7)) {
1121 vol->iocharset = kstrdup(value,
1122 GFP_KERNEL);
1123
1124 if (!vol->iocharset) {
1125 printk(KERN_WARNING "CIFS: no "
1126 "memory for"
1127 "charset\n");
1128 goto cifs_parse_mount_err;
1129 }
1130 }
1131 /* if iocharset not set then load_nls_default
1132 is used by caller */
1133 cFYI(1, "iocharset set to %s", value);
1134 } else {
1135 printk(KERN_WARNING "CIFS: iocharset name "
1136 "too long.\n");
1137 goto cifs_parse_mount_err;
1138 }
1139 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1140 vol->linux_uid = simple_strtoul(value, &value, 0);
1141 uid_specified = true;
1142 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1143 vol->cred_uid = simple_strtoul(value, &value, 0);
1144 } else if (!strnicmp(data, "forceuid", 8)) {
1145 override_uid = 1;
1146 } else if (!strnicmp(data, "noforceuid", 10)) {
1147 override_uid = 0;
1148 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1149 vol->linux_gid = simple_strtoul(value, &value, 0);
1150 gid_specified = true;
1151 } else if (!strnicmp(data, "forcegid", 8)) {
1152 override_gid = 1;
1153 } else if (!strnicmp(data, "noforcegid", 10)) {
1154 override_gid = 0;
1155 } else if (strnicmp(data, "file_mode", 4) == 0) {
1156 if (value && *value) {
1157 vol->file_mode =
1158 simple_strtoul(value, &value, 0);
1159 }
1160 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1161 if (value && *value) {
1162 vol->dir_mode =
1163 simple_strtoul(value, &value, 0);
1164 }
1165 } else if (strnicmp(data, "dirmode", 4) == 0) {
1166 if (value && *value) {
1167 vol->dir_mode =
1168 simple_strtoul(value, &value, 0);
1169 }
1170 } else if (strnicmp(data, "port", 4) == 0) {
1171 if (value && *value) {
1172 vol->port =
1173 simple_strtoul(value, &value, 0);
1174 }
1175 } else if (strnicmp(data, "rsize", 5) == 0) {
1176 if (value && *value) {
1177 vol->rsize =
1178 simple_strtoul(value, &value, 0);
1179 }
1180 } else if (strnicmp(data, "wsize", 5) == 0) {
1181 if (value && *value) {
1182 vol->wsize =
1183 simple_strtoul(value, &value, 0);
1184 }
1185 } else if (strnicmp(data, "sockopt", 5) == 0) {
1186 if (!value || !*value) {
1187 cERROR(1, "no socket option specified");
1188 continue;
1189 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1190 vol->sockopt_tcp_nodelay = 1;
1191 }
1192 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1193 if (!value || !*value || (*value == ' ')) {
1194 cFYI(1, "invalid (empty) netbiosname");
1195 } else {
1196 memset(vol->source_rfc1001_name, 0x20,
1197 RFC1001_NAME_LEN);
1198 /*
1199 * FIXME: are there cases in which a comma can
1200 * be valid in workstation netbios name (and
1201 * need special handling)?
1202 */
1203 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1204 /* don't ucase netbiosname for user */
1205 if (value[i] == 0)
1206 break;
1207 vol->source_rfc1001_name[i] = value[i];
1208 }
1209 /* The string has 16th byte zero still from
1210 set at top of the function */
1211 if (i == RFC1001_NAME_LEN && value[i] != 0)
1212 printk(KERN_WARNING "CIFS: netbiosname"
1213 " longer than 15 truncated.\n");
1214 }
1215 } else if (strnicmp(data, "servern", 7) == 0) {
1216 /* servernetbiosname specified override *SMBSERVER */
1217 if (!value || !*value || (*value == ' ')) {
1218 cFYI(1, "empty server netbiosname specified");
1219 } else {
1220 /* last byte, type, is 0x20 for servr type */
1221 memset(vol->target_rfc1001_name, 0x20,
1222 RFC1001_NAME_LEN_WITH_NULL);
1223
1224 for (i = 0; i < 15; i++) {
1225 /* BB are there cases in which a comma can be
1226 valid in this workstation netbios name
1227 (and need special handling)? */
1228
1229 /* user or mount helper must uppercase
1230 the netbiosname */
1231 if (value[i] == 0)
1232 break;
1233 else
1234 vol->target_rfc1001_name[i] =
1235 value[i];
1236 }
1237 /* The string has 16th byte zero still from
1238 set at top of the function */
1239 if (i == RFC1001_NAME_LEN && value[i] != 0)
1240 printk(KERN_WARNING "CIFS: server net"
1241 "biosname longer than 15 truncated.\n");
1242 }
1243 } else if (strnicmp(data, "actimeo", 7) == 0) {
1244 if (value && *value) {
1245 vol->actimeo = HZ * simple_strtoul(value,
1246 &value, 0);
1247 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1248 cERROR(1, "CIFS: attribute cache"
1249 "timeout too large");
1250 goto cifs_parse_mount_err;
1251 }
1252 }
1253 } else if (strnicmp(data, "credentials", 4) == 0) {
1254 /* ignore */
1255 } else if (strnicmp(data, "version", 3) == 0) {
1256 /* ignore */
1257 } else if (strnicmp(data, "guest", 5) == 0) {
1258 /* ignore */
1259 } else if (strnicmp(data, "rw", 2) == 0) {
1260 /* ignore */
1261 } else if (strnicmp(data, "ro", 2) == 0) {
1262 /* ignore */
1263 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1264 vol->noblocksnd = 1;
1265 } else if (strnicmp(data, "noautotune", 10) == 0) {
1266 vol->noautotune = 1;
1267 } else if ((strnicmp(data, "suid", 4) == 0) ||
1268 (strnicmp(data, "nosuid", 6) == 0) ||
1269 (strnicmp(data, "exec", 4) == 0) ||
1270 (strnicmp(data, "noexec", 6) == 0) ||
1271 (strnicmp(data, "nodev", 5) == 0) ||
1272 (strnicmp(data, "noauto", 6) == 0) ||
1273 (strnicmp(data, "dev", 3) == 0)) {
1274 /* The mount tool or mount.cifs helper (if present)
1275 uses these opts to set flags, and the flags are read
1276 by the kernel vfs layer before we get here (ie
1277 before read super) so there is no point trying to
1278 parse these options again and set anything and it
1279 is ok to just ignore them */
1280 continue;
1281 } else if (strnicmp(data, "hard", 4) == 0) {
1282 vol->retry = 1;
1283 } else if (strnicmp(data, "soft", 4) == 0) {
1284 vol->retry = 0;
1285 } else if (strnicmp(data, "perm", 4) == 0) {
1286 vol->noperm = 0;
1287 } else if (strnicmp(data, "noperm", 6) == 0) {
1288 vol->noperm = 1;
1289 } else if (strnicmp(data, "mapchars", 8) == 0) {
1290 vol->remap = 1;
1291 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1292 vol->remap = 0;
1293 } else if (strnicmp(data, "sfu", 3) == 0) {
1294 vol->sfu_emul = 1;
1295 } else if (strnicmp(data, "nosfu", 5) == 0) {
1296 vol->sfu_emul = 0;
1297 } else if (strnicmp(data, "nodfs", 5) == 0) {
1298 vol->nodfs = 1;
1299 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1300 vol->posix_paths = 1;
1301 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1302 vol->posix_paths = 0;
1303 } else if (strnicmp(data, "nounix", 6) == 0) {
1304 vol->no_linux_ext = 1;
1305 } else if (strnicmp(data, "nolinux", 7) == 0) {
1306 vol->no_linux_ext = 1;
1307 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1308 (strnicmp(data, "ignorecase", 10) == 0)) {
1309 vol->nocase = 1;
1310 } else if (strnicmp(data, "mand", 4) == 0) {
1311 /* ignore */
1312 } else if (strnicmp(data, "nomand", 6) == 0) {
1313 /* ignore */
1314 } else if (strnicmp(data, "_netdev", 7) == 0) {
1315 /* ignore */
1316 } else if (strnicmp(data, "brl", 3) == 0) {
1317 vol->nobrl = 0;
1318 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1319 (strnicmp(data, "nolock", 6) == 0)) {
1320 vol->nobrl = 1;
1321 /* turn off mandatory locking in mode
1322 if remote locking is turned off since the
1323 local vfs will do advisory */
1324 if (vol->file_mode ==
1325 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1326 vol->file_mode = S_IALLUGO;
1327 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1328 /* will take the shorter form "forcemand" as well */
1329 /* This mount option will force use of mandatory
1330 (DOS/Windows style) byte range locks, instead of
1331 using posix advisory byte range locks, even if the
1332 Unix extensions are available and posix locks would
1333 be supported otherwise. If Unix extensions are not
1334 negotiated this has no effect since mandatory locks
1335 would be used (mandatory locks is all that those
1336 those servers support) */
1337 vol->mand_lock = 1;
1338 } else if (strnicmp(data, "setuids", 7) == 0) {
1339 vol->setuids = 1;
1340 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1341 vol->setuids = 0;
1342 } else if (strnicmp(data, "dynperm", 7) == 0) {
1343 vol->dynperm = true;
1344 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1345 vol->dynperm = false;
1346 } else if (strnicmp(data, "nohard", 6) == 0) {
1347 vol->retry = 0;
1348 } else if (strnicmp(data, "nosoft", 6) == 0) {
1349 vol->retry = 1;
1350 } else if (strnicmp(data, "nointr", 6) == 0) {
1351 vol->intr = 0;
1352 } else if (strnicmp(data, "intr", 4) == 0) {
1353 vol->intr = 1;
1354 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1355 vol->nostrictsync = 1;
1356 } else if (strnicmp(data, "strictsync", 10) == 0) {
1357 vol->nostrictsync = 0;
1358 } else if (strnicmp(data, "serverino", 7) == 0) {
1359 vol->server_ino = 1;
1360 } else if (strnicmp(data, "noserverino", 9) == 0) {
1361 vol->server_ino = 0;
1362 } else if (strnicmp(data, "rwpidforward", 4) == 0) {
1363 vol->rwpidforward = 1;
1364 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1365 vol->cifs_acl = 1;
1366 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1367 vol->cifs_acl = 0;
1368 } else if (strnicmp(data, "acl", 3) == 0) {
1369 vol->no_psx_acl = 0;
1370 } else if (strnicmp(data, "noacl", 5) == 0) {
1371 vol->no_psx_acl = 1;
1372 } else if (strnicmp(data, "locallease", 6) == 0) {
1373 vol->local_lease = 1;
1374 } else if (strnicmp(data, "sign", 4) == 0) {
1375 vol->secFlg |= CIFSSEC_MUST_SIGN;
1376 } else if (strnicmp(data, "seal", 4) == 0) {
1377 /* we do not do the following in secFlags because seal
1378 is a per tree connection (mount) not a per socket
1379 or per-smb connection option in the protocol */
1380 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1381 vol->seal = 1;
1382 } else if (strnicmp(data, "direct", 6) == 0) {
1383 vol->direct_io = 1;
1384 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1385 vol->direct_io = 1;
1386 } else if (strnicmp(data, "strictcache", 11) == 0) {
1387 vol->strict_io = 1;
1388 } else if (strnicmp(data, "noac", 4) == 0) {
1389 printk(KERN_WARNING "CIFS: Mount option noac not "
1390 "supported. Instead set "
1391 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1392 } else if (strnicmp(data, "fsc", 3) == 0) {
1393 #ifndef CONFIG_CIFS_FSCACHE
1394 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
1395 "kernel config option set");
1396 goto cifs_parse_mount_err;
1397 #endif
1398 vol->fsc = true;
1399 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1400 vol->mfsymlinks = true;
1401 } else if (strnicmp(data, "multiuser", 8) == 0) {
1402 vol->multiuser = true;
1403 } else
1404 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1405 data);
1406 }
1407 if (vol->UNC == NULL) {
1408 if (devname == NULL) {
1409 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1410 "target\n");
1411 goto cifs_parse_mount_err;
1412 }
1413 if ((temp_len = strnlen(devname, 300)) < 300) {
1414 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1415 if (vol->UNC == NULL)
1416 goto cifs_parse_mount_err;
1417 strcpy(vol->UNC, devname);
1418 if (strncmp(vol->UNC, "//", 2) == 0) {
1419 vol->UNC[0] = '\\';
1420 vol->UNC[1] = '\\';
1421 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1422 printk(KERN_WARNING "CIFS: UNC Path does not "
1423 "begin with // or \\\\ \n");
1424 goto cifs_parse_mount_err;
1425 }
1426 value = strpbrk(vol->UNC+2, "/\\");
1427 if (value)
1428 *value = '\\';
1429 } else {
1430 printk(KERN_WARNING "CIFS: UNC name too long\n");
1431 goto cifs_parse_mount_err;
1432 }
1433 }
1434
1435 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1436 cERROR(1, "Multiuser mounts currently require krb5 "
1437 "authentication!");
1438 goto cifs_parse_mount_err;
1439 }
1440
1441 if (vol->UNCip == NULL)
1442 vol->UNCip = &vol->UNC[2];
1443
1444 if (uid_specified)
1445 vol->override_uid = override_uid;
1446 else if (override_uid == 1)
1447 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1448 "specified with no uid= option.\n");
1449
1450 if (gid_specified)
1451 vol->override_gid = override_gid;
1452 else if (override_gid == 1)
1453 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1454 "specified with no gid= option.\n");
1455
1456 kfree(mountdata_copy);
1457 return 0;
1458
1459 cifs_parse_mount_err:
1460 kfree(mountdata_copy);
1461 return 1;
1462 }
1463
1464 /** Returns true if srcaddr isn't specified and rhs isn't
1465 * specified, or if srcaddr is specified and
1466 * matches the IP address of the rhs argument.
1467 */
1468 static bool
1469 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1470 {
1471 switch (srcaddr->sa_family) {
1472 case AF_UNSPEC:
1473 return (rhs->sa_family == AF_UNSPEC);
1474 case AF_INET: {
1475 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1476 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1477 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1478 }
1479 case AF_INET6: {
1480 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1481 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1482 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1483 }
1484 default:
1485 WARN_ON(1);
1486 return false; /* don't expect to be here */
1487 }
1488 }
1489
1490 /*
1491 * If no port is specified in addr structure, we try to match with 445 port
1492 * and if it fails - with 139 ports. It should be called only if address
1493 * families of server and addr are equal.
1494 */
1495 static bool
1496 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1497 {
1498 __be16 port, *sport;
1499
1500 switch (addr->sa_family) {
1501 case AF_INET:
1502 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1503 port = ((struct sockaddr_in *) addr)->sin_port;
1504 break;
1505 case AF_INET6:
1506 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1507 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1508 break;
1509 default:
1510 WARN_ON(1);
1511 return false;
1512 }
1513
1514 if (!port) {
1515 port = htons(CIFS_PORT);
1516 if (port == *sport)
1517 return true;
1518
1519 port = htons(RFC1001_PORT);
1520 }
1521
1522 return port == *sport;
1523 }
1524
1525 static bool
1526 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1527 struct sockaddr *srcaddr)
1528 {
1529 switch (addr->sa_family) {
1530 case AF_INET: {
1531 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1532 struct sockaddr_in *srv_addr4 =
1533 (struct sockaddr_in *)&server->dstaddr;
1534
1535 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1536 return false;
1537 break;
1538 }
1539 case AF_INET6: {
1540 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1541 struct sockaddr_in6 *srv_addr6 =
1542 (struct sockaddr_in6 *)&server->dstaddr;
1543
1544 if (!ipv6_addr_equal(&addr6->sin6_addr,
1545 &srv_addr6->sin6_addr))
1546 return false;
1547 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1548 return false;
1549 break;
1550 }
1551 default:
1552 WARN_ON(1);
1553 return false; /* don't expect to be here */
1554 }
1555
1556 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1557 return false;
1558
1559 return true;
1560 }
1561
1562 static bool
1563 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1564 {
1565 unsigned int secFlags;
1566
1567 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1568 secFlags = vol->secFlg;
1569 else
1570 secFlags = global_secflags | vol->secFlg;
1571
1572 switch (server->secType) {
1573 case LANMAN:
1574 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1575 return false;
1576 break;
1577 case NTLMv2:
1578 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1579 return false;
1580 break;
1581 case NTLM:
1582 if (!(secFlags & CIFSSEC_MAY_NTLM))
1583 return false;
1584 break;
1585 case Kerberos:
1586 if (!(secFlags & CIFSSEC_MAY_KRB5))
1587 return false;
1588 break;
1589 case RawNTLMSSP:
1590 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1591 return false;
1592 break;
1593 default:
1594 /* shouldn't happen */
1595 return false;
1596 }
1597
1598 /* now check if signing mode is acceptable */
1599 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1600 (server->secMode & SECMODE_SIGN_REQUIRED))
1601 return false;
1602 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1603 (server->secMode &
1604 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1605 return false;
1606
1607 return true;
1608 }
1609
1610 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1611 struct smb_vol *vol)
1612 {
1613 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1614 return 0;
1615
1616 if (!match_address(server, addr,
1617 (struct sockaddr *)&vol->srcaddr))
1618 return 0;
1619
1620 if (!match_port(server, addr))
1621 return 0;
1622
1623 if (!match_security(server, vol))
1624 return 0;
1625
1626 return 1;
1627 }
1628
1629 static struct TCP_Server_Info *
1630 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1631 {
1632 struct TCP_Server_Info *server;
1633
1634 spin_lock(&cifs_tcp_ses_lock);
1635 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1636 if (!match_server(server, addr, vol))
1637 continue;
1638
1639 ++server->srv_count;
1640 spin_unlock(&cifs_tcp_ses_lock);
1641 cFYI(1, "Existing tcp session with server found");
1642 return server;
1643 }
1644 spin_unlock(&cifs_tcp_ses_lock);
1645 return NULL;
1646 }
1647
1648 static void
1649 cifs_put_tcp_session(struct TCP_Server_Info *server)
1650 {
1651 struct task_struct *task;
1652
1653 spin_lock(&cifs_tcp_ses_lock);
1654 if (--server->srv_count > 0) {
1655 spin_unlock(&cifs_tcp_ses_lock);
1656 return;
1657 }
1658
1659 put_net(cifs_net_ns(server));
1660
1661 list_del_init(&server->tcp_ses_list);
1662 spin_unlock(&cifs_tcp_ses_lock);
1663
1664 cancel_delayed_work_sync(&server->echo);
1665
1666 spin_lock(&GlobalMid_Lock);
1667 server->tcpStatus = CifsExiting;
1668 spin_unlock(&GlobalMid_Lock);
1669
1670 cifs_crypto_shash_release(server);
1671 cifs_fscache_release_client_cookie(server);
1672
1673 kfree(server->session_key.response);
1674 server->session_key.response = NULL;
1675 server->session_key.len = 0;
1676
1677 task = xchg(&server->tsk, NULL);
1678 if (task)
1679 force_sig(SIGKILL, task);
1680 }
1681
1682 static struct TCP_Server_Info *
1683 cifs_get_tcp_session(struct smb_vol *volume_info)
1684 {
1685 struct TCP_Server_Info *tcp_ses = NULL;
1686 struct sockaddr_storage addr;
1687 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1688 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1689 int rc;
1690
1691 memset(&addr, 0, sizeof(struct sockaddr_storage));
1692
1693 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1694
1695 if (volume_info->UNCip && volume_info->UNC) {
1696 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1697 volume_info->UNCip,
1698 strlen(volume_info->UNCip),
1699 volume_info->port);
1700 if (!rc) {
1701 /* we failed translating address */
1702 rc = -EINVAL;
1703 goto out_err;
1704 }
1705 } else if (volume_info->UNCip) {
1706 /* BB using ip addr as tcp_ses name to connect to the
1707 DFS root below */
1708 cERROR(1, "Connecting to DFS root not implemented yet");
1709 rc = -EINVAL;
1710 goto out_err;
1711 } else /* which tcp_sess DFS root would we conect to */ {
1712 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1713 "unc=//192.168.1.100/public) specified");
1714 rc = -EINVAL;
1715 goto out_err;
1716 }
1717
1718 /* see if we already have a matching tcp_ses */
1719 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1720 if (tcp_ses)
1721 return tcp_ses;
1722
1723 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1724 if (!tcp_ses) {
1725 rc = -ENOMEM;
1726 goto out_err;
1727 }
1728
1729 rc = cifs_crypto_shash_allocate(tcp_ses);
1730 if (rc) {
1731 cERROR(1, "could not setup hash structures rc %d", rc);
1732 goto out_err;
1733 }
1734
1735 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1736 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1737 if (IS_ERR(tcp_ses->hostname)) {
1738 rc = PTR_ERR(tcp_ses->hostname);
1739 goto out_err_crypto_release;
1740 }
1741
1742 tcp_ses->noblocksnd = volume_info->noblocksnd;
1743 tcp_ses->noautotune = volume_info->noautotune;
1744 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1745 atomic_set(&tcp_ses->inFlight, 0);
1746 init_waitqueue_head(&tcp_ses->response_q);
1747 init_waitqueue_head(&tcp_ses->request_q);
1748 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1749 mutex_init(&tcp_ses->srv_mutex);
1750 memcpy(tcp_ses->workstation_RFC1001_name,
1751 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1752 memcpy(tcp_ses->server_RFC1001_name,
1753 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1754 tcp_ses->session_estab = false;
1755 tcp_ses->sequence_number = 0;
1756 tcp_ses->lstrp = jiffies;
1757 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1758 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1759 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1760
1761 /*
1762 * at this point we are the only ones with the pointer
1763 * to the struct since the kernel thread not created yet
1764 * no need to spinlock this init of tcpStatus or srv_count
1765 */
1766 tcp_ses->tcpStatus = CifsNew;
1767 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1768 sizeof(tcp_ses->srcaddr));
1769 ++tcp_ses->srv_count;
1770
1771 if (addr.ss_family == AF_INET6) {
1772 cFYI(1, "attempting ipv6 connect");
1773 /* BB should we allow ipv6 on port 139? */
1774 /* other OS never observed in Wild doing 139 with v6 */
1775 memcpy(&tcp_ses->dstaddr, sin_server6,
1776 sizeof(struct sockaddr_in6));
1777 } else
1778 memcpy(&tcp_ses->dstaddr, sin_server,
1779 sizeof(struct sockaddr_in));
1780
1781 rc = ip_connect(tcp_ses);
1782 if (rc < 0) {
1783 cERROR(1, "Error connecting to socket. Aborting operation");
1784 goto out_err_crypto_release;
1785 }
1786
1787 /*
1788 * since we're in a cifs function already, we know that
1789 * this will succeed. No need for try_module_get().
1790 */
1791 __module_get(THIS_MODULE);
1792 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1793 tcp_ses, "cifsd");
1794 if (IS_ERR(tcp_ses->tsk)) {
1795 rc = PTR_ERR(tcp_ses->tsk);
1796 cERROR(1, "error %d create cifsd thread", rc);
1797 module_put(THIS_MODULE);
1798 goto out_err_crypto_release;
1799 }
1800 tcp_ses->tcpStatus = CifsNeedNegotiate;
1801
1802 /* thread spawned, put it on the list */
1803 spin_lock(&cifs_tcp_ses_lock);
1804 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1805 spin_unlock(&cifs_tcp_ses_lock);
1806
1807 cifs_fscache_get_client_cookie(tcp_ses);
1808
1809 /* queue echo request delayed work */
1810 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1811
1812 return tcp_ses;
1813
1814 out_err_crypto_release:
1815 cifs_crypto_shash_release(tcp_ses);
1816
1817 put_net(cifs_net_ns(tcp_ses));
1818
1819 out_err:
1820 if (tcp_ses) {
1821 if (!IS_ERR(tcp_ses->hostname))
1822 kfree(tcp_ses->hostname);
1823 if (tcp_ses->ssocket)
1824 sock_release(tcp_ses->ssocket);
1825 kfree(tcp_ses);
1826 }
1827 return ERR_PTR(rc);
1828 }
1829
1830 static int match_session(struct cifsSesInfo *ses, struct smb_vol *vol)
1831 {
1832 switch (ses->server->secType) {
1833 case Kerberos:
1834 if (vol->cred_uid != ses->cred_uid)
1835 return 0;
1836 break;
1837 default:
1838 /* anything else takes username/password */
1839 if (ses->user_name == NULL)
1840 return 0;
1841 if (strncmp(ses->user_name, vol->username,
1842 MAX_USERNAME_SIZE))
1843 return 0;
1844 if (strlen(vol->username) != 0 &&
1845 ses->password != NULL &&
1846 strncmp(ses->password,
1847 vol->password ? vol->password : "",
1848 MAX_PASSWORD_SIZE))
1849 return 0;
1850 }
1851 return 1;
1852 }
1853
1854 static struct cifsSesInfo *
1855 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1856 {
1857 struct cifsSesInfo *ses;
1858
1859 spin_lock(&cifs_tcp_ses_lock);
1860 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1861 if (!match_session(ses, vol))
1862 continue;
1863 ++ses->ses_count;
1864 spin_unlock(&cifs_tcp_ses_lock);
1865 return ses;
1866 }
1867 spin_unlock(&cifs_tcp_ses_lock);
1868 return NULL;
1869 }
1870
1871 static void
1872 cifs_put_smb_ses(struct cifsSesInfo *ses)
1873 {
1874 int xid;
1875 struct TCP_Server_Info *server = ses->server;
1876
1877 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1878 spin_lock(&cifs_tcp_ses_lock);
1879 if (--ses->ses_count > 0) {
1880 spin_unlock(&cifs_tcp_ses_lock);
1881 return;
1882 }
1883
1884 list_del_init(&ses->smb_ses_list);
1885 spin_unlock(&cifs_tcp_ses_lock);
1886
1887 if (ses->status == CifsGood) {
1888 xid = GetXid();
1889 CIFSSMBLogoff(xid, ses);
1890 _FreeXid(xid);
1891 }
1892 sesInfoFree(ses);
1893 cifs_put_tcp_session(server);
1894 }
1895
1896 static bool warned_on_ntlm; /* globals init to false automatically */
1897
1898 static struct cifsSesInfo *
1899 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1900 {
1901 int rc = -ENOMEM, xid;
1902 struct cifsSesInfo *ses;
1903 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1904 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1905
1906 xid = GetXid();
1907
1908 ses = cifs_find_smb_ses(server, volume_info);
1909 if (ses) {
1910 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1911
1912 mutex_lock(&ses->session_mutex);
1913 rc = cifs_negotiate_protocol(xid, ses);
1914 if (rc) {
1915 mutex_unlock(&ses->session_mutex);
1916 /* problem -- put our ses reference */
1917 cifs_put_smb_ses(ses);
1918 FreeXid(xid);
1919 return ERR_PTR(rc);
1920 }
1921 if (ses->need_reconnect) {
1922 cFYI(1, "Session needs reconnect");
1923 rc = cifs_setup_session(xid, ses,
1924 volume_info->local_nls);
1925 if (rc) {
1926 mutex_unlock(&ses->session_mutex);
1927 /* problem -- put our reference */
1928 cifs_put_smb_ses(ses);
1929 FreeXid(xid);
1930 return ERR_PTR(rc);
1931 }
1932 }
1933 mutex_unlock(&ses->session_mutex);
1934
1935 /* existing SMB ses has a server reference already */
1936 cifs_put_tcp_session(server);
1937 FreeXid(xid);
1938 return ses;
1939 }
1940
1941 cFYI(1, "Existing smb sess not found");
1942 ses = sesInfoAlloc();
1943 if (ses == NULL)
1944 goto get_ses_fail;
1945
1946 /* new SMB session uses our server ref */
1947 ses->server = server;
1948 if (server->dstaddr.ss_family == AF_INET6)
1949 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1950 else
1951 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1952
1953 if (volume_info->username) {
1954 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
1955 if (!ses->user_name)
1956 goto get_ses_fail;
1957 }
1958
1959 /* volume_info->password freed at unmount */
1960 if (volume_info->password) {
1961 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1962 if (!ses->password)
1963 goto get_ses_fail;
1964 }
1965 if (volume_info->domainname) {
1966 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1967 if (!ses->domainName)
1968 goto get_ses_fail;
1969 }
1970 ses->cred_uid = volume_info->cred_uid;
1971 ses->linux_uid = volume_info->linux_uid;
1972
1973 /* ntlmv2 is much stronger than ntlm security, and has been broadly
1974 supported for many years, time to update default security mechanism */
1975 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
1976 warned_on_ntlm = true;
1977 cERROR(1, "default security mechanism requested. The default "
1978 "security mechanism will be upgraded from ntlm to "
1979 "ntlmv2 in kernel release 2.6.41");
1980 }
1981 ses->overrideSecFlg = volume_info->secFlg;
1982
1983 mutex_lock(&ses->session_mutex);
1984 rc = cifs_negotiate_protocol(xid, ses);
1985 if (!rc)
1986 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1987 mutex_unlock(&ses->session_mutex);
1988 if (rc)
1989 goto get_ses_fail;
1990
1991 /* success, put it on the list */
1992 spin_lock(&cifs_tcp_ses_lock);
1993 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1994 spin_unlock(&cifs_tcp_ses_lock);
1995
1996 FreeXid(xid);
1997 return ses;
1998
1999 get_ses_fail:
2000 sesInfoFree(ses);
2001 FreeXid(xid);
2002 return ERR_PTR(rc);
2003 }
2004
2005 static int match_tcon(struct cifsTconInfo *tcon, const char *unc)
2006 {
2007 if (tcon->tidStatus == CifsExiting)
2008 return 0;
2009 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2010 return 0;
2011 return 1;
2012 }
2013
2014 static struct cifsTconInfo *
2015 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
2016 {
2017 struct list_head *tmp;
2018 struct cifsTconInfo *tcon;
2019
2020 spin_lock(&cifs_tcp_ses_lock);
2021 list_for_each(tmp, &ses->tcon_list) {
2022 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
2023 if (!match_tcon(tcon, unc))
2024 continue;
2025 ++tcon->tc_count;
2026 spin_unlock(&cifs_tcp_ses_lock);
2027 return tcon;
2028 }
2029 spin_unlock(&cifs_tcp_ses_lock);
2030 return NULL;
2031 }
2032
2033 static void
2034 cifs_put_tcon(struct cifsTconInfo *tcon)
2035 {
2036 int xid;
2037 struct cifsSesInfo *ses = tcon->ses;
2038
2039 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2040 spin_lock(&cifs_tcp_ses_lock);
2041 if (--tcon->tc_count > 0) {
2042 spin_unlock(&cifs_tcp_ses_lock);
2043 return;
2044 }
2045
2046 list_del_init(&tcon->tcon_list);
2047 spin_unlock(&cifs_tcp_ses_lock);
2048
2049 xid = GetXid();
2050 CIFSSMBTDis(xid, tcon);
2051 _FreeXid(xid);
2052
2053 cifs_fscache_release_super_cookie(tcon);
2054 tconInfoFree(tcon);
2055 cifs_put_smb_ses(ses);
2056 }
2057
2058 static struct cifsTconInfo *
2059 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
2060 {
2061 int rc, xid;
2062 struct cifsTconInfo *tcon;
2063
2064 tcon = cifs_find_tcon(ses, volume_info->UNC);
2065 if (tcon) {
2066 cFYI(1, "Found match on UNC path");
2067 /* existing tcon already has a reference */
2068 cifs_put_smb_ses(ses);
2069 if (tcon->seal != volume_info->seal)
2070 cERROR(1, "transport encryption setting "
2071 "conflicts with existing tid");
2072 return tcon;
2073 }
2074
2075 tcon = tconInfoAlloc();
2076 if (tcon == NULL) {
2077 rc = -ENOMEM;
2078 goto out_fail;
2079 }
2080
2081 tcon->ses = ses;
2082 if (volume_info->password) {
2083 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2084 if (!tcon->password) {
2085 rc = -ENOMEM;
2086 goto out_fail;
2087 }
2088 }
2089
2090 if (strchr(volume_info->UNC + 3, '\\') == NULL
2091 && strchr(volume_info->UNC + 3, '/') == NULL) {
2092 cERROR(1, "Missing share name");
2093 rc = -ENODEV;
2094 goto out_fail;
2095 }
2096
2097 /* BB Do we need to wrap session_mutex around
2098 * this TCon call and Unix SetFS as
2099 * we do on SessSetup and reconnect? */
2100 xid = GetXid();
2101 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2102 FreeXid(xid);
2103 cFYI(1, "CIFS Tcon rc = %d", rc);
2104 if (rc)
2105 goto out_fail;
2106
2107 if (volume_info->nodfs) {
2108 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2109 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2110 }
2111 tcon->seal = volume_info->seal;
2112 /* we can have only one retry value for a connection
2113 to a share so for resources mounted more than once
2114 to the same server share the last value passed in
2115 for the retry flag is used */
2116 tcon->retry = volume_info->retry;
2117 tcon->nocase = volume_info->nocase;
2118 tcon->local_lease = volume_info->local_lease;
2119
2120 spin_lock(&cifs_tcp_ses_lock);
2121 list_add(&tcon->tcon_list, &ses->tcon_list);
2122 spin_unlock(&cifs_tcp_ses_lock);
2123
2124 cifs_fscache_get_super_cookie(tcon);
2125
2126 return tcon;
2127
2128 out_fail:
2129 tconInfoFree(tcon);
2130 return ERR_PTR(rc);
2131 }
2132
2133 void
2134 cifs_put_tlink(struct tcon_link *tlink)
2135 {
2136 if (!tlink || IS_ERR(tlink))
2137 return;
2138
2139 if (!atomic_dec_and_test(&tlink->tl_count) ||
2140 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2141 tlink->tl_time = jiffies;
2142 return;
2143 }
2144
2145 if (!IS_ERR(tlink_tcon(tlink)))
2146 cifs_put_tcon(tlink_tcon(tlink));
2147 kfree(tlink);
2148 return;
2149 }
2150
2151 static inline struct tcon_link *
2152 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb);
2153
2154 static int
2155 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2156 {
2157 struct cifs_sb_info *old = CIFS_SB(sb);
2158 struct cifs_sb_info *new = mnt_data->cifs_sb;
2159
2160 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2161 return 0;
2162
2163 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2164 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2165 return 0;
2166
2167 if (old->rsize != new->rsize)
2168 return 0;
2169
2170 /*
2171 * We want to share sb only if we don't specify wsize or specified wsize
2172 * is greater or equal than existing one.
2173 */
2174 if (new->wsize && new->wsize < old->wsize)
2175 return 0;
2176
2177 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2178 return 0;
2179
2180 if (old->mnt_file_mode != new->mnt_file_mode ||
2181 old->mnt_dir_mode != new->mnt_dir_mode)
2182 return 0;
2183
2184 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2185 return 0;
2186
2187 if (old->actimeo != new->actimeo)
2188 return 0;
2189
2190 return 1;
2191 }
2192
2193 int
2194 cifs_match_super(struct super_block *sb, void *data)
2195 {
2196 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2197 struct smb_vol *volume_info;
2198 struct cifs_sb_info *cifs_sb;
2199 struct TCP_Server_Info *tcp_srv;
2200 struct cifsSesInfo *ses;
2201 struct cifsTconInfo *tcon;
2202 struct tcon_link *tlink;
2203 struct sockaddr_storage addr;
2204 int rc = 0;
2205
2206 memset(&addr, 0, sizeof(struct sockaddr_storage));
2207
2208 spin_lock(&cifs_tcp_ses_lock);
2209 cifs_sb = CIFS_SB(sb);
2210 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2211 if (IS_ERR(tlink)) {
2212 spin_unlock(&cifs_tcp_ses_lock);
2213 return rc;
2214 }
2215 tcon = tlink_tcon(tlink);
2216 ses = tcon->ses;
2217 tcp_srv = ses->server;
2218
2219 volume_info = mnt_data->vol;
2220
2221 if (!volume_info->UNCip || !volume_info->UNC)
2222 goto out;
2223
2224 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2225 volume_info->UNCip,
2226 strlen(volume_info->UNCip),
2227 volume_info->port);
2228 if (!rc)
2229 goto out;
2230
2231 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2232 !match_session(ses, volume_info) ||
2233 !match_tcon(tcon, volume_info->UNC)) {
2234 rc = 0;
2235 goto out;
2236 }
2237
2238 rc = compare_mount_options(sb, mnt_data);
2239 out:
2240 cifs_put_tlink(tlink);
2241 spin_unlock(&cifs_tcp_ses_lock);
2242 return rc;
2243 }
2244
2245 int
2246 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2247 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2248 struct dfs_info3_param **preferrals, int remap)
2249 {
2250 char *temp_unc;
2251 int rc = 0;
2252
2253 *pnum_referrals = 0;
2254 *preferrals = NULL;
2255
2256 if (pSesInfo->ipc_tid == 0) {
2257 temp_unc = kmalloc(2 /* for slashes */ +
2258 strnlen(pSesInfo->serverName,
2259 SERVER_NAME_LEN_WITH_NULL * 2)
2260 + 1 + 4 /* slash IPC$ */ + 2,
2261 GFP_KERNEL);
2262 if (temp_unc == NULL)
2263 return -ENOMEM;
2264 temp_unc[0] = '\\';
2265 temp_unc[1] = '\\';
2266 strcpy(temp_unc + 2, pSesInfo->serverName);
2267 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2268 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2269 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2270 kfree(temp_unc);
2271 }
2272 if (rc == 0)
2273 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2274 pnum_referrals, nls_codepage, remap);
2275 /* BB map targetUNCs to dfs_info3 structures, here or
2276 in CIFSGetDFSRefer BB */
2277
2278 return rc;
2279 }
2280
2281 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2282 static struct lock_class_key cifs_key[2];
2283 static struct lock_class_key cifs_slock_key[2];
2284
2285 static inline void
2286 cifs_reclassify_socket4(struct socket *sock)
2287 {
2288 struct sock *sk = sock->sk;
2289 BUG_ON(sock_owned_by_user(sk));
2290 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2291 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2292 }
2293
2294 static inline void
2295 cifs_reclassify_socket6(struct socket *sock)
2296 {
2297 struct sock *sk = sock->sk;
2298 BUG_ON(sock_owned_by_user(sk));
2299 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2300 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2301 }
2302 #else
2303 static inline void
2304 cifs_reclassify_socket4(struct socket *sock)
2305 {
2306 }
2307
2308 static inline void
2309 cifs_reclassify_socket6(struct socket *sock)
2310 {
2311 }
2312 #endif
2313
2314 /* See RFC1001 section 14 on representation of Netbios names */
2315 static void rfc1002mangle(char *target, char *source, unsigned int length)
2316 {
2317 unsigned int i, j;
2318
2319 for (i = 0, j = 0; i < (length); i++) {
2320 /* mask a nibble at a time and encode */
2321 target[j] = 'A' + (0x0F & (source[i] >> 4));
2322 target[j+1] = 'A' + (0x0F & source[i]);
2323 j += 2;
2324 }
2325
2326 }
2327
2328 static int
2329 bind_socket(struct TCP_Server_Info *server)
2330 {
2331 int rc = 0;
2332 if (server->srcaddr.ss_family != AF_UNSPEC) {
2333 /* Bind to the specified local IP address */
2334 struct socket *socket = server->ssocket;
2335 rc = socket->ops->bind(socket,
2336 (struct sockaddr *) &server->srcaddr,
2337 sizeof(server->srcaddr));
2338 if (rc < 0) {
2339 struct sockaddr_in *saddr4;
2340 struct sockaddr_in6 *saddr6;
2341 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2342 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2343 if (saddr6->sin6_family == AF_INET6)
2344 cERROR(1, "cifs: "
2345 "Failed to bind to: %pI6c, error: %d\n",
2346 &saddr6->sin6_addr, rc);
2347 else
2348 cERROR(1, "cifs: "
2349 "Failed to bind to: %pI4, error: %d\n",
2350 &saddr4->sin_addr.s_addr, rc);
2351 }
2352 }
2353 return rc;
2354 }
2355
2356 static int
2357 ip_rfc1001_connect(struct TCP_Server_Info *server)
2358 {
2359 int rc = 0;
2360 /*
2361 * some servers require RFC1001 sessinit before sending
2362 * negprot - BB check reconnection in case where second
2363 * sessinit is sent but no second negprot
2364 */
2365 struct rfc1002_session_packet *ses_init_buf;
2366 struct smb_hdr *smb_buf;
2367 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2368 GFP_KERNEL);
2369 if (ses_init_buf) {
2370 ses_init_buf->trailer.session_req.called_len = 32;
2371
2372 if (server->server_RFC1001_name &&
2373 server->server_RFC1001_name[0] != 0)
2374 rfc1002mangle(ses_init_buf->trailer.
2375 session_req.called_name,
2376 server->server_RFC1001_name,
2377 RFC1001_NAME_LEN_WITH_NULL);
2378 else
2379 rfc1002mangle(ses_init_buf->trailer.
2380 session_req.called_name,
2381 DEFAULT_CIFS_CALLED_NAME,
2382 RFC1001_NAME_LEN_WITH_NULL);
2383
2384 ses_init_buf->trailer.session_req.calling_len = 32;
2385
2386 /*
2387 * calling name ends in null (byte 16) from old smb
2388 * convention.
2389 */
2390 if (server->workstation_RFC1001_name &&
2391 server->workstation_RFC1001_name[0] != 0)
2392 rfc1002mangle(ses_init_buf->trailer.
2393 session_req.calling_name,
2394 server->workstation_RFC1001_name,
2395 RFC1001_NAME_LEN_WITH_NULL);
2396 else
2397 rfc1002mangle(ses_init_buf->trailer.
2398 session_req.calling_name,
2399 "LINUX_CIFS_CLNT",
2400 RFC1001_NAME_LEN_WITH_NULL);
2401
2402 ses_init_buf->trailer.session_req.scope1 = 0;
2403 ses_init_buf->trailer.session_req.scope2 = 0;
2404 smb_buf = (struct smb_hdr *)ses_init_buf;
2405
2406 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2407 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2408 rc = smb_send(server, smb_buf, 0x44);
2409 kfree(ses_init_buf);
2410 /*
2411 * RFC1001 layer in at least one server
2412 * requires very short break before negprot
2413 * presumably because not expecting negprot
2414 * to follow so fast. This is a simple
2415 * solution that works without
2416 * complicating the code and causes no
2417 * significant slowing down on mount
2418 * for everyone else
2419 */
2420 usleep_range(1000, 2000);
2421 }
2422 /*
2423 * else the negprot may still work without this
2424 * even though malloc failed
2425 */
2426
2427 return rc;
2428 }
2429
2430 static int
2431 generic_ip_connect(struct TCP_Server_Info *server)
2432 {
2433 int rc = 0;
2434 __be16 sport;
2435 int slen, sfamily;
2436 struct socket *socket = server->ssocket;
2437 struct sockaddr *saddr;
2438
2439 saddr = (struct sockaddr *) &server->dstaddr;
2440
2441 if (server->dstaddr.ss_family == AF_INET6) {
2442 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2443 slen = sizeof(struct sockaddr_in6);
2444 sfamily = AF_INET6;
2445 } else {
2446 sport = ((struct sockaddr_in *) saddr)->sin_port;
2447 slen = sizeof(struct sockaddr_in);
2448 sfamily = AF_INET;
2449 }
2450
2451 if (socket == NULL) {
2452 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2453 IPPROTO_TCP, &socket, 1);
2454 if (rc < 0) {
2455 cERROR(1, "Error %d creating socket", rc);
2456 server->ssocket = NULL;
2457 return rc;
2458 }
2459
2460 /* BB other socket options to set KEEPALIVE, NODELAY? */
2461 cFYI(1, "Socket created");
2462 server->ssocket = socket;
2463 socket->sk->sk_allocation = GFP_NOFS;
2464 if (sfamily == AF_INET6)
2465 cifs_reclassify_socket6(socket);
2466 else
2467 cifs_reclassify_socket4(socket);
2468 }
2469
2470 rc = bind_socket(server);
2471 if (rc < 0)
2472 return rc;
2473
2474 rc = socket->ops->connect(socket, saddr, slen, 0);
2475 if (rc < 0) {
2476 cFYI(1, "Error %d connecting to server", rc);
2477 sock_release(socket);
2478 server->ssocket = NULL;
2479 return rc;
2480 }
2481
2482 /*
2483 * Eventually check for other socket options to change from
2484 * the default. sock_setsockopt not used because it expects
2485 * user space buffer
2486 */
2487 socket->sk->sk_rcvtimeo = 7 * HZ;
2488 socket->sk->sk_sndtimeo = 5 * HZ;
2489
2490 /* make the bufsizes depend on wsize/rsize and max requests */
2491 if (server->noautotune) {
2492 if (socket->sk->sk_sndbuf < (200 * 1024))
2493 socket->sk->sk_sndbuf = 200 * 1024;
2494 if (socket->sk->sk_rcvbuf < (140 * 1024))
2495 socket->sk->sk_rcvbuf = 140 * 1024;
2496 }
2497
2498 if (server->tcp_nodelay) {
2499 int val = 1;
2500 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2501 (char *)&val, sizeof(val));
2502 if (rc)
2503 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2504 }
2505
2506 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2507 socket->sk->sk_sndbuf,
2508 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2509
2510 if (sport == htons(RFC1001_PORT))
2511 rc = ip_rfc1001_connect(server);
2512
2513 return rc;
2514 }
2515
2516 static int
2517 ip_connect(struct TCP_Server_Info *server)
2518 {
2519 __be16 *sport;
2520 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2521 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2522
2523 if (server->dstaddr.ss_family == AF_INET6)
2524 sport = &addr6->sin6_port;
2525 else
2526 sport = &addr->sin_port;
2527
2528 if (*sport == 0) {
2529 int rc;
2530
2531 /* try with 445 port at first */
2532 *sport = htons(CIFS_PORT);
2533
2534 rc = generic_ip_connect(server);
2535 if (rc >= 0)
2536 return rc;
2537
2538 /* if it failed, try with 139 port */
2539 *sport = htons(RFC1001_PORT);
2540 }
2541
2542 return generic_ip_connect(server);
2543 }
2544
2545 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2546 struct super_block *sb, struct smb_vol *vol_info)
2547 {
2548 /* if we are reconnecting then should we check to see if
2549 * any requested capabilities changed locally e.g. via
2550 * remount but we can not do much about it here
2551 * if they have (even if we could detect it by the following)
2552 * Perhaps we could add a backpointer to array of sb from tcon
2553 * or if we change to make all sb to same share the same
2554 * sb as NFS - then we only have one backpointer to sb.
2555 * What if we wanted to mount the server share twice once with
2556 * and once without posixacls or posix paths? */
2557 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2558
2559 if (vol_info && vol_info->no_linux_ext) {
2560 tcon->fsUnixInfo.Capability = 0;
2561 tcon->unix_ext = 0; /* Unix Extensions disabled */
2562 cFYI(1, "Linux protocol extensions disabled");
2563 return;
2564 } else if (vol_info)
2565 tcon->unix_ext = 1; /* Unix Extensions supported */
2566
2567 if (tcon->unix_ext == 0) {
2568 cFYI(1, "Unix extensions disabled so not set on reconnect");
2569 return;
2570 }
2571
2572 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2573 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2574 cFYI(1, "unix caps which server supports %lld", cap);
2575 /* check for reconnect case in which we do not
2576 want to change the mount behavior if we can avoid it */
2577 if (vol_info == NULL) {
2578 /* turn off POSIX ACL and PATHNAMES if not set
2579 originally at mount time */
2580 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2581 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2582 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2583 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2584 cERROR(1, "POSIXPATH support change");
2585 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2586 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2587 cERROR(1, "possible reconnect error");
2588 cERROR(1, "server disabled POSIX path support");
2589 }
2590 }
2591
2592 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2593 cERROR(1, "per-share encryption not supported yet");
2594
2595 cap &= CIFS_UNIX_CAP_MASK;
2596 if (vol_info && vol_info->no_psx_acl)
2597 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2598 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2599 cFYI(1, "negotiated posix acl support");
2600 if (sb)
2601 sb->s_flags |= MS_POSIXACL;
2602 }
2603
2604 if (vol_info && vol_info->posix_paths == 0)
2605 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2606 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2607 cFYI(1, "negotiate posix pathnames");
2608 if (sb)
2609 CIFS_SB(sb)->mnt_cifs_flags |=
2610 CIFS_MOUNT_POSIX_PATHS;
2611 }
2612
2613 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2614 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2615 CIFS_SB(sb)->rsize = 127 * 1024;
2616 cFYI(DBG2, "larger reads not supported by srv");
2617 }
2618 }
2619
2620
2621 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2622 #ifdef CONFIG_CIFS_DEBUG2
2623 if (cap & CIFS_UNIX_FCNTL_CAP)
2624 cFYI(1, "FCNTL cap");
2625 if (cap & CIFS_UNIX_EXTATTR_CAP)
2626 cFYI(1, "EXTATTR cap");
2627 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2628 cFYI(1, "POSIX path cap");
2629 if (cap & CIFS_UNIX_XATTR_CAP)
2630 cFYI(1, "XATTR cap");
2631 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2632 cFYI(1, "POSIX ACL cap");
2633 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2634 cFYI(1, "very large read cap");
2635 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2636 cFYI(1, "very large write cap");
2637 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2638 cFYI(1, "transport encryption cap");
2639 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2640 cFYI(1, "mandatory transport encryption cap");
2641 #endif /* CIFS_DEBUG2 */
2642 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2643 if (vol_info == NULL) {
2644 cFYI(1, "resetting capabilities failed");
2645 } else
2646 cERROR(1, "Negotiating Unix capabilities "
2647 "with the server failed. Consider "
2648 "mounting with the Unix Extensions\n"
2649 "disabled, if problems are found, "
2650 "by specifying the nounix mount "
2651 "option.");
2652
2653 }
2654 }
2655 }
2656
2657 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2658 struct cifs_sb_info *cifs_sb)
2659 {
2660 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2661
2662 if (pvolume_info->rsize > CIFSMaxBufSize) {
2663 cERROR(1, "rsize %d too large, using MaxBufSize",
2664 pvolume_info->rsize);
2665 cifs_sb->rsize = CIFSMaxBufSize;
2666 } else if ((pvolume_info->rsize) &&
2667 (pvolume_info->rsize <= CIFSMaxBufSize))
2668 cifs_sb->rsize = pvolume_info->rsize;
2669 else /* default */
2670 cifs_sb->rsize = CIFSMaxBufSize;
2671
2672 if (cifs_sb->rsize < 2048) {
2673 cifs_sb->rsize = 2048;
2674 /* Windows ME may prefer this */
2675 cFYI(1, "readsize set to minimum: 2048");
2676 }
2677
2678 /*
2679 * Temporarily set wsize for matching superblock. If we end up using
2680 * new sb then cifs_negotiate_wsize will later negotiate it downward
2681 * if needed.
2682 */
2683 cifs_sb->wsize = pvolume_info->wsize;
2684
2685 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2686 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2687 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2688 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2689 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2690 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2691
2692 cifs_sb->actimeo = pvolume_info->actimeo;
2693 cifs_sb->local_nls = pvolume_info->local_nls;
2694
2695 if (pvolume_info->noperm)
2696 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2697 if (pvolume_info->setuids)
2698 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2699 if (pvolume_info->server_ino)
2700 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2701 if (pvolume_info->remap)
2702 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2703 if (pvolume_info->no_xattr)
2704 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2705 if (pvolume_info->sfu_emul)
2706 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2707 if (pvolume_info->nobrl)
2708 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2709 if (pvolume_info->nostrictsync)
2710 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2711 if (pvolume_info->mand_lock)
2712 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2713 if (pvolume_info->rwpidforward)
2714 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
2715 if (pvolume_info->cifs_acl)
2716 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2717 if (pvolume_info->override_uid)
2718 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2719 if (pvolume_info->override_gid)
2720 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2721 if (pvolume_info->dynperm)
2722 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2723 if (pvolume_info->fsc)
2724 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2725 if (pvolume_info->multiuser)
2726 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2727 CIFS_MOUNT_NO_PERM);
2728 if (pvolume_info->strict_io)
2729 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2730 if (pvolume_info->direct_io) {
2731 cFYI(1, "mounting share using direct i/o");
2732 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2733 }
2734 if (pvolume_info->mfsymlinks) {
2735 if (pvolume_info->sfu_emul) {
2736 cERROR(1, "mount option mfsymlinks ignored if sfu "
2737 "mount option is used");
2738 } else {
2739 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2740 }
2741 }
2742
2743 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2744 cERROR(1, "mount option dynperm ignored if cifsacl "
2745 "mount option supported");
2746 }
2747
2748 /*
2749 * When the server supports very large writes via POSIX extensions, we can
2750 * allow up to 2^24 - PAGE_CACHE_SIZE.
2751 *
2752 * Note that this might make for "interesting" allocation problems during
2753 * writeback however (as we have to allocate an array of pointers for the
2754 * pages). A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2755 */
2756 #define CIFS_MAX_WSIZE ((1<<24) - PAGE_CACHE_SIZE)
2757
2758 /*
2759 * When the server doesn't allow large posix writes, default to a wsize of
2760 * 128k - PAGE_CACHE_SIZE -- one page less than the largest frame size
2761 * described in RFC1001. This allows space for the header without going over
2762 * that by default.
2763 */
2764 #define CIFS_MAX_RFC1001_WSIZE (128 * 1024 - PAGE_CACHE_SIZE)
2765
2766 /*
2767 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2768 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2769 * a single wsize request with a single call.
2770 */
2771 #define CIFS_DEFAULT_WSIZE (1024 * 1024)
2772
2773 static unsigned int
2774 cifs_negotiate_wsize(struct cifsTconInfo *tcon, struct smb_vol *pvolume_info)
2775 {
2776 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2777 struct TCP_Server_Info *server = tcon->ses->server;
2778 unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
2779 CIFS_DEFAULT_WSIZE;
2780
2781 /* can server support 24-bit write sizes? (via UNIX extensions) */
2782 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2783 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1001_WSIZE);
2784
2785 /* no CAP_LARGE_WRITE_X? Limit it to 16 bits */
2786 if (!(server->capabilities & CAP_LARGE_WRITE_X))
2787 wsize = min_t(unsigned int, wsize, USHRT_MAX);
2788
2789 /* hard limit of CIFS_MAX_WSIZE */
2790 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2791
2792 return wsize;
2793 }
2794
2795 static int
2796 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2797 struct cifs_sb_info *cifs_sb, const char *full_path)
2798 {
2799 int rc;
2800 FILE_ALL_INFO *pfile_info;
2801
2802 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2803 if (pfile_info == NULL)
2804 return -ENOMEM;
2805
2806 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2807 0 /* not legacy */, cifs_sb->local_nls,
2808 cifs_sb->mnt_cifs_flags &
2809 CIFS_MOUNT_MAP_SPECIAL_CHR);
2810
2811 if (rc == -EOPNOTSUPP || rc == -EINVAL)
2812 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
2813 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
2814 CIFS_MOUNT_MAP_SPECIAL_CHR);
2815 kfree(pfile_info);
2816 return rc;
2817 }
2818
2819 void
2820 cifs_cleanup_volume_info(struct smb_vol **pvolume_info)
2821 {
2822 struct smb_vol *volume_info;
2823
2824 if (!pvolume_info || !*pvolume_info)
2825 return;
2826
2827 volume_info = *pvolume_info;
2828 kfree(volume_info->username);
2829 kzfree(volume_info->password);
2830 kfree(volume_info->UNC);
2831 kfree(volume_info->UNCip);
2832 kfree(volume_info->domainname);
2833 kfree(volume_info->iocharset);
2834 kfree(volume_info->prepath);
2835 kfree(volume_info);
2836 *pvolume_info = NULL;
2837 return;
2838 }
2839
2840 #ifdef CONFIG_CIFS_DFS_UPCALL
2841 /* build_path_to_root returns full path to root when
2842 * we do not have an exiting connection (tcon) */
2843 static char *
2844 build_unc_path_to_root(const struct smb_vol *volume_info,
2845 const struct cifs_sb_info *cifs_sb)
2846 {
2847 char *full_path;
2848
2849 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2850 full_path = kmalloc(unc_len + 1, GFP_KERNEL);
2851 if (full_path == NULL)
2852 return ERR_PTR(-ENOMEM);
2853
2854 strncpy(full_path, volume_info->UNC, unc_len);
2855 full_path[unc_len] = 0; /* add trailing null */
2856 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
2857 return full_path;
2858 }
2859
2860 /*
2861 * Perform a dfs referral query for a share and (optionally) prefix
2862 *
2863 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
2864 * to a string containing updated options for the submount. Otherwise it
2865 * will be left untouched.
2866 *
2867 * Returns the rc from get_dfs_path to the caller, which can be used to
2868 * determine whether there were referrals.
2869 */
2870 static int
2871 expand_dfs_referral(int xid, struct cifsSesInfo *pSesInfo,
2872 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
2873 int check_prefix)
2874 {
2875 int rc;
2876 unsigned int num_referrals = 0;
2877 struct dfs_info3_param *referrals = NULL;
2878 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
2879
2880 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2881 if (IS_ERR(full_path))
2882 return PTR_ERR(full_path);
2883
2884 /* For DFS paths, skip the first '\' of the UNC */
2885 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
2886
2887 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
2888 &num_referrals, &referrals,
2889 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2890
2891 if (!rc && num_referrals > 0) {
2892 char *fake_devname = NULL;
2893
2894 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
2895 full_path + 1, referrals,
2896 &fake_devname);
2897
2898 free_dfs_info_array(referrals, num_referrals);
2899 kfree(fake_devname);
2900
2901 if (cifs_sb->mountdata != NULL)
2902 kfree(cifs_sb->mountdata);
2903
2904 if (IS_ERR(mdata)) {
2905 rc = PTR_ERR(mdata);
2906 mdata = NULL;
2907 }
2908 cifs_sb->mountdata = mdata;
2909 }
2910 kfree(full_path);
2911 return rc;
2912 }
2913 #endif
2914
2915 int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,
2916 const char *devname)
2917 {
2918 struct smb_vol *volume_info;
2919 int rc = 0;
2920
2921 *pvolume_info = NULL;
2922
2923 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2924 if (!volume_info) {
2925 rc = -ENOMEM;
2926 goto out;
2927 }
2928
2929 if (cifs_parse_mount_options(mount_data, devname,
2930 volume_info)) {
2931 rc = -EINVAL;
2932 goto out;
2933 }
2934
2935 if (volume_info->nullauth) {
2936 cFYI(1, "null user");
2937 volume_info->username = "";
2938 } else if (volume_info->username) {
2939 /* BB fixme parse for domain name here */
2940 cFYI(1, "Username: %s", volume_info->username);
2941 } else {
2942 cifserror("No username specified");
2943 /* In userspace mount helper we can get user name from alternate
2944 locations such as env variables and files on disk */
2945 rc = -EINVAL;
2946 goto out;
2947 }
2948
2949 /* this is needed for ASCII cp to Unicode converts */
2950 if (volume_info->iocharset == NULL) {
2951 /* load_nls_default cannot return null */
2952 volume_info->local_nls = load_nls_default();
2953 } else {
2954 volume_info->local_nls = load_nls(volume_info->iocharset);
2955 if (volume_info->local_nls == NULL) {
2956 cERROR(1, "CIFS mount error: iocharset %s not found",
2957 volume_info->iocharset);
2958 rc = -ELIBACC;
2959 goto out;
2960 }
2961 }
2962
2963 *pvolume_info = volume_info;
2964 return rc;
2965 out:
2966 cifs_cleanup_volume_info(&volume_info);
2967 return rc;
2968 }
2969
2970 int
2971 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2972 struct smb_vol *volume_info, const char *devname)
2973 {
2974 int rc = 0;
2975 int xid;
2976 struct cifsSesInfo *pSesInfo;
2977 struct cifsTconInfo *tcon;
2978 struct TCP_Server_Info *srvTcp;
2979 char *full_path;
2980 struct tcon_link *tlink;
2981 #ifdef CONFIG_CIFS_DFS_UPCALL
2982 int referral_walks_count = 0;
2983 try_mount_again:
2984 /* cleanup activities if we're chasing a referral */
2985 if (referral_walks_count) {
2986 if (tcon)
2987 cifs_put_tcon(tcon);
2988 else if (pSesInfo)
2989 cifs_put_smb_ses(pSesInfo);
2990
2991 cifs_cleanup_volume_info(&volume_info);
2992 FreeXid(xid);
2993 }
2994 #endif
2995 tcon = NULL;
2996 pSesInfo = NULL;
2997 srvTcp = NULL;
2998 full_path = NULL;
2999 tlink = NULL;
3000
3001 xid = GetXid();
3002
3003 /* get a reference to a tcp session */
3004 srvTcp = cifs_get_tcp_session(volume_info);
3005 if (IS_ERR(srvTcp)) {
3006 rc = PTR_ERR(srvTcp);
3007 goto out;
3008 }
3009
3010 /* get a reference to a SMB session */
3011 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3012 if (IS_ERR(pSesInfo)) {
3013 rc = PTR_ERR(pSesInfo);
3014 pSesInfo = NULL;
3015 goto mount_fail_check;
3016 }
3017
3018 if (pSesInfo->capabilities & CAP_LARGE_FILES)
3019 sb->s_maxbytes = MAX_LFS_FILESIZE;
3020 else
3021 sb->s_maxbytes = MAX_NON_LFS;
3022
3023 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
3024 sb->s_time_gran = 100;
3025
3026 /* search for existing tcon to this server share */
3027 tcon = cifs_get_tcon(pSesInfo, volume_info);
3028 if (IS_ERR(tcon)) {
3029 rc = PTR_ERR(tcon);
3030 tcon = NULL;
3031 goto remote_path_check;
3032 }
3033
3034 /* tell server which Unix caps we support */
3035 if (tcon->ses->capabilities & CAP_UNIX) {
3036 /* reset of caps checks mount to see if unix extensions
3037 disabled for just this mount */
3038 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
3039 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3040 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3041 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3042 rc = -EACCES;
3043 goto mount_fail_check;
3044 }
3045 } else
3046 tcon->unix_ext = 0; /* server does not support them */
3047
3048 /* do not care if following two calls succeed - informational */
3049 if (!tcon->ipc) {
3050 CIFSSMBQFSDeviceInfo(xid, tcon);
3051 CIFSSMBQFSAttributeInfo(xid, tcon);
3052 }
3053
3054 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
3055 cifs_sb->rsize = 1024 * 127;
3056 cFYI(DBG2, "no very large read support, rsize now 127K");
3057 }
3058 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
3059 cifs_sb->rsize = min(cifs_sb->rsize,
3060 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
3061
3062 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3063
3064 remote_path_check:
3065 #ifdef CONFIG_CIFS_DFS_UPCALL
3066 /*
3067 * Perform an unconditional check for whether there are DFS
3068 * referrals for this path without prefix, to provide support
3069 * for DFS referrals from w2k8 servers which don't seem to respond
3070 * with PATH_NOT_COVERED to requests that include the prefix.
3071 * Chase the referral if found, otherwise continue normally.
3072 */
3073 if (referral_walks_count == 0) {
3074 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3075 cifs_sb, false);
3076 if (!refrc) {
3077 referral_walks_count++;
3078 goto try_mount_again;
3079 }
3080 }
3081 #endif
3082
3083 /* check if a whole path is not remote */
3084 if (!rc && tcon) {
3085 /* build_path_to_root works only when we have a valid tcon */
3086 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3087 if (full_path == NULL) {
3088 rc = -ENOMEM;
3089 goto mount_fail_check;
3090 }
3091 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3092 if (rc != 0 && rc != -EREMOTE) {
3093 kfree(full_path);
3094 goto mount_fail_check;
3095 }
3096 kfree(full_path);
3097 }
3098
3099 /* get referral if needed */
3100 if (rc == -EREMOTE) {
3101 #ifdef CONFIG_CIFS_DFS_UPCALL
3102 if (referral_walks_count > MAX_NESTED_LINKS) {
3103 /*
3104 * BB: when we implement proper loop detection,
3105 * we will remove this check. But now we need it
3106 * to prevent an indefinite loop if 'DFS tree' is
3107 * misconfigured (i.e. has loops).
3108 */
3109 rc = -ELOOP;
3110 goto mount_fail_check;
3111 }
3112
3113 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3114 true);
3115
3116 if (!rc) {
3117 referral_walks_count++;
3118 goto try_mount_again;
3119 }
3120 goto mount_fail_check;
3121 #else /* No DFS support, return error on mount */
3122 rc = -EOPNOTSUPP;
3123 #endif
3124 }
3125
3126 if (rc)
3127 goto mount_fail_check;
3128
3129 /* now, hang the tcon off of the superblock */
3130 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3131 if (tlink == NULL) {
3132 rc = -ENOMEM;
3133 goto mount_fail_check;
3134 }
3135
3136 tlink->tl_uid = pSesInfo->linux_uid;
3137 tlink->tl_tcon = tcon;
3138 tlink->tl_time = jiffies;
3139 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3140 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3141
3142 cifs_sb->master_tlink = tlink;
3143 spin_lock(&cifs_sb->tlink_tree_lock);
3144 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3145 spin_unlock(&cifs_sb->tlink_tree_lock);
3146
3147 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3148 TLINK_IDLE_EXPIRE);
3149
3150 mount_fail_check:
3151 /* on error free sesinfo and tcon struct if needed */
3152 if (rc) {
3153 /* If find_unc succeeded then rc == 0 so we can not end */
3154 /* up accidentally freeing someone elses tcon struct */
3155 if (tcon)
3156 cifs_put_tcon(tcon);
3157 else if (pSesInfo)
3158 cifs_put_smb_ses(pSesInfo);
3159 else
3160 cifs_put_tcp_session(srvTcp);
3161 goto out;
3162 }
3163
3164 /* volume_info->password is freed above when existing session found
3165 (in which case it is not needed anymore) but when new sesion is created
3166 the password ptr is put in the new session structure (in which case the
3167 password will be freed at unmount time) */
3168 out:
3169 /* zero out password before freeing */
3170 FreeXid(xid);
3171 return rc;
3172 }
3173
3174 int
3175 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
3176 const char *tree, struct cifsTconInfo *tcon,
3177 const struct nls_table *nls_codepage)
3178 {
3179 struct smb_hdr *smb_buffer;
3180 struct smb_hdr *smb_buffer_response;
3181 TCONX_REQ *pSMB;
3182 TCONX_RSP *pSMBr;
3183 unsigned char *bcc_ptr;
3184 int rc = 0;
3185 int length;
3186 __u16 bytes_left, count;
3187
3188 if (ses == NULL)
3189 return -EIO;
3190
3191 smb_buffer = cifs_buf_get();
3192 if (smb_buffer == NULL)
3193 return -ENOMEM;
3194
3195 smb_buffer_response = smb_buffer;
3196
3197 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3198 NULL /*no tid */ , 4 /*wct */ );
3199
3200 smb_buffer->Mid = GetNextMid(ses->server);
3201 smb_buffer->Uid = ses->Suid;
3202 pSMB = (TCONX_REQ *) smb_buffer;
3203 pSMBr = (TCONX_RSP *) smb_buffer_response;
3204
3205 pSMB->AndXCommand = 0xFF;
3206 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3207 bcc_ptr = &pSMB->Password[0];
3208 if ((ses->server->secMode) & SECMODE_USER) {
3209 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3210 *bcc_ptr = 0; /* password is null byte */
3211 bcc_ptr++; /* skip password */
3212 /* already aligned so no need to do it below */
3213 } else {
3214 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3215 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3216 specified as required (when that support is added to
3217 the vfs in the future) as only NTLM or the much
3218 weaker LANMAN (which we do not send by default) is accepted
3219 by Samba (not sure whether other servers allow
3220 NTLMv2 password here) */
3221 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3222 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3223 (ses->server->secType == LANMAN))
3224 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3225 ses->server->secMode &
3226 SECMODE_PW_ENCRYPT ? true : false,
3227 bcc_ptr);
3228 else
3229 #endif /* CIFS_WEAK_PW_HASH */
3230 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3231 bcc_ptr);
3232
3233 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3234 if (ses->capabilities & CAP_UNICODE) {
3235 /* must align unicode strings */
3236 *bcc_ptr = 0; /* null byte password */
3237 bcc_ptr++;
3238 }
3239 }
3240
3241 if (ses->server->secMode &
3242 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3243 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3244
3245 if (ses->capabilities & CAP_STATUS32) {
3246 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3247 }
3248 if (ses->capabilities & CAP_DFS) {
3249 smb_buffer->Flags2 |= SMBFLG2_DFS;
3250 }
3251 if (ses->capabilities & CAP_UNICODE) {
3252 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3253 length =
3254 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3255 6 /* max utf8 char length in bytes */ *
3256 (/* server len*/ + 256 /* share len */), nls_codepage);
3257 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3258 bcc_ptr += 2; /* skip trailing null */
3259 } else { /* ASCII */
3260 strcpy(bcc_ptr, tree);
3261 bcc_ptr += strlen(tree) + 1;
3262 }
3263 strcpy(bcc_ptr, "?????");
3264 bcc_ptr += strlen("?????");
3265 bcc_ptr += 1;
3266 count = bcc_ptr - &pSMB->Password[0];
3267 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3268 pSMB->hdr.smb_buf_length) + count);
3269 pSMB->ByteCount = cpu_to_le16(count);
3270
3271 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3272 0);
3273
3274 /* above now done in SendReceive */
3275 if ((rc == 0) && (tcon != NULL)) {
3276 bool is_unicode;
3277
3278 tcon->tidStatus = CifsGood;
3279 tcon->need_reconnect = false;
3280 tcon->tid = smb_buffer_response->Tid;
3281 bcc_ptr = pByteArea(smb_buffer_response);
3282 bytes_left = get_bcc(smb_buffer_response);
3283 length = strnlen(bcc_ptr, bytes_left - 2);
3284 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3285 is_unicode = true;
3286 else
3287 is_unicode = false;
3288
3289
3290 /* skip service field (NB: this field is always ASCII) */
3291 if (length == 3) {
3292 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3293 (bcc_ptr[2] == 'C')) {
3294 cFYI(1, "IPC connection");
3295 tcon->ipc = 1;
3296 }
3297 } else if (length == 2) {
3298 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3299 /* the most common case */
3300 cFYI(1, "disk share connection");
3301 }
3302 }
3303 bcc_ptr += length + 1;
3304 bytes_left -= (length + 1);
3305 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3306
3307 /* mostly informational -- no need to fail on error here */
3308 kfree(tcon->nativeFileSystem);
3309 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3310 bytes_left, is_unicode,
3311 nls_codepage);
3312
3313 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3314
3315 if ((smb_buffer_response->WordCount == 3) ||
3316 (smb_buffer_response->WordCount == 7))
3317 /* field is in same location */
3318 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3319 else
3320 tcon->Flags = 0;
3321 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3322 } else if ((rc == 0) && tcon == NULL) {
3323 /* all we need to save for IPC$ connection */
3324 ses->ipc_tid = smb_buffer_response->Tid;
3325 }
3326
3327 cifs_buf_release(smb_buffer);
3328 return rc;
3329 }
3330
3331 int
3332 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3333 {
3334 struct rb_root *root = &cifs_sb->tlink_tree;
3335 struct rb_node *node;
3336 struct tcon_link *tlink;
3337
3338 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3339
3340 spin_lock(&cifs_sb->tlink_tree_lock);
3341 while ((node = rb_first(root))) {
3342 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3343 cifs_get_tlink(tlink);
3344 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3345 rb_erase(node, root);
3346
3347 spin_unlock(&cifs_sb->tlink_tree_lock);
3348 cifs_put_tlink(tlink);
3349 spin_lock(&cifs_sb->tlink_tree_lock);
3350 }
3351 spin_unlock(&cifs_sb->tlink_tree_lock);
3352
3353 return 0;
3354 }
3355
3356 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3357 {
3358 int rc = 0;
3359 struct TCP_Server_Info *server = ses->server;
3360
3361 /* only send once per connect */
3362 if (server->maxBuf != 0)
3363 return 0;
3364
3365 rc = CIFSSMBNegotiate(xid, ses);
3366 if (rc == -EAGAIN) {
3367 /* retry only once on 1st time connection */
3368 rc = CIFSSMBNegotiate(xid, ses);
3369 if (rc == -EAGAIN)
3370 rc = -EHOSTDOWN;
3371 }
3372 if (rc == 0) {
3373 spin_lock(&GlobalMid_Lock);
3374 if (server->tcpStatus != CifsExiting)
3375 server->tcpStatus = CifsGood;
3376 else
3377 rc = -EHOSTDOWN;
3378 spin_unlock(&GlobalMid_Lock);
3379
3380 }
3381
3382 return rc;
3383 }
3384
3385
3386 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3387 struct nls_table *nls_info)
3388 {
3389 int rc = 0;
3390 struct TCP_Server_Info *server = ses->server;
3391
3392 ses->flags = 0;
3393 ses->capabilities = server->capabilities;
3394 if (linuxExtEnabled == 0)
3395 ses->capabilities &= (~CAP_UNIX);
3396
3397 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3398 server->secMode, server->capabilities, server->timeAdj);
3399
3400 rc = CIFS_SessSetup(xid, ses, nls_info);
3401 if (rc) {
3402 cERROR(1, "Send error in SessSetup = %d", rc);
3403 } else {
3404 mutex_lock(&ses->server->srv_mutex);
3405 if (!server->session_estab) {
3406 server->session_key.response = ses->auth_key.response;
3407 server->session_key.len = ses->auth_key.len;
3408 server->sequence_number = 0x2;
3409 server->session_estab = true;
3410 ses->auth_key.response = NULL;
3411 }
3412 mutex_unlock(&server->srv_mutex);
3413
3414 cFYI(1, "CIFS Session Established successfully");
3415 spin_lock(&GlobalMid_Lock);
3416 ses->status = CifsGood;
3417 ses->need_reconnect = false;
3418 spin_unlock(&GlobalMid_Lock);
3419 }
3420
3421 kfree(ses->auth_key.response);
3422 ses->auth_key.response = NULL;
3423 ses->auth_key.len = 0;
3424 kfree(ses->ntlmssp);
3425 ses->ntlmssp = NULL;
3426
3427 return rc;
3428 }
3429
3430 static struct cifsTconInfo *
3431 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3432 {
3433 struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3434 struct cifsSesInfo *ses;
3435 struct cifsTconInfo *tcon = NULL;
3436 struct smb_vol *vol_info;
3437 char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3438 /* We used to have this as MAX_USERNAME which is */
3439 /* way too big now (256 instead of 32) */
3440
3441 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3442 if (vol_info == NULL) {
3443 tcon = ERR_PTR(-ENOMEM);
3444 goto out;
3445 }
3446
3447 snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3448 vol_info->username = username;
3449 vol_info->local_nls = cifs_sb->local_nls;
3450 vol_info->linux_uid = fsuid;
3451 vol_info->cred_uid = fsuid;
3452 vol_info->UNC = master_tcon->treeName;
3453 vol_info->retry = master_tcon->retry;
3454 vol_info->nocase = master_tcon->nocase;
3455 vol_info->local_lease = master_tcon->local_lease;
3456 vol_info->no_linux_ext = !master_tcon->unix_ext;
3457
3458 /* FIXME: allow for other secFlg settings */
3459 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3460
3461 /* get a reference for the same TCP session */
3462 spin_lock(&cifs_tcp_ses_lock);
3463 ++master_tcon->ses->server->srv_count;
3464 spin_unlock(&cifs_tcp_ses_lock);
3465
3466 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3467 if (IS_ERR(ses)) {
3468 tcon = (struct cifsTconInfo *)ses;
3469 cifs_put_tcp_session(master_tcon->ses->server);
3470 goto out;
3471 }
3472
3473 tcon = cifs_get_tcon(ses, vol_info);
3474 if (IS_ERR(tcon)) {
3475 cifs_put_smb_ses(ses);
3476 goto out;
3477 }
3478
3479 if (ses->capabilities & CAP_UNIX)
3480 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3481 out:
3482 kfree(vol_info);
3483
3484 return tcon;
3485 }
3486
3487 static inline struct tcon_link *
3488 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3489 {
3490 return cifs_sb->master_tlink;
3491 }
3492
3493 struct cifsTconInfo *
3494 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3495 {
3496 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3497 }
3498
3499 static int
3500 cifs_sb_tcon_pending_wait(void *unused)
3501 {
3502 schedule();
3503 return signal_pending(current) ? -ERESTARTSYS : 0;
3504 }
3505
3506 /* find and return a tlink with given uid */
3507 static struct tcon_link *
3508 tlink_rb_search(struct rb_root *root, uid_t uid)
3509 {
3510 struct rb_node *node = root->rb_node;
3511 struct tcon_link *tlink;
3512
3513 while (node) {
3514 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3515
3516 if (tlink->tl_uid > uid)
3517 node = node->rb_left;
3518 else if (tlink->tl_uid < uid)
3519 node = node->rb_right;
3520 else
3521 return tlink;
3522 }
3523 return NULL;
3524 }
3525
3526 /* insert a tcon_link into the tree */
3527 static void
3528 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3529 {
3530 struct rb_node **new = &(root->rb_node), *parent = NULL;
3531 struct tcon_link *tlink;
3532
3533 while (*new) {
3534 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3535 parent = *new;
3536
3537 if (tlink->tl_uid > new_tlink->tl_uid)
3538 new = &((*new)->rb_left);
3539 else
3540 new = &((*new)->rb_right);
3541 }
3542
3543 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3544 rb_insert_color(&new_tlink->tl_rbnode, root);
3545 }
3546
3547 /*
3548 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3549 * current task.
3550 *
3551 * If the superblock doesn't refer to a multiuser mount, then just return
3552 * the master tcon for the mount.
3553 *
3554 * First, search the rbtree for an existing tcon for this fsuid. If one
3555 * exists, then check to see if it's pending construction. If it is then wait
3556 * for construction to complete. Once it's no longer pending, check to see if
3557 * it failed and either return an error or retry construction, depending on
3558 * the timeout.
3559 *
3560 * If one doesn't exist then insert a new tcon_link struct into the tree and
3561 * try to construct a new one.
3562 */
3563 struct tcon_link *
3564 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3565 {
3566 int ret;
3567 uid_t fsuid = current_fsuid();
3568 struct tcon_link *tlink, *newtlink;
3569
3570 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3571 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3572
3573 spin_lock(&cifs_sb->tlink_tree_lock);
3574 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3575 if (tlink)
3576 cifs_get_tlink(tlink);
3577 spin_unlock(&cifs_sb->tlink_tree_lock);
3578
3579 if (tlink == NULL) {
3580 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3581 if (newtlink == NULL)
3582 return ERR_PTR(-ENOMEM);
3583 newtlink->tl_uid = fsuid;
3584 newtlink->tl_tcon = ERR_PTR(-EACCES);
3585 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3586 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3587 cifs_get_tlink(newtlink);
3588
3589 spin_lock(&cifs_sb->tlink_tree_lock);
3590 /* was one inserted after previous search? */
3591 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3592 if (tlink) {
3593 cifs_get_tlink(tlink);
3594 spin_unlock(&cifs_sb->tlink_tree_lock);
3595 kfree(newtlink);
3596 goto wait_for_construction;
3597 }
3598 tlink = newtlink;
3599 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3600 spin_unlock(&cifs_sb->tlink_tree_lock);
3601 } else {
3602 wait_for_construction:
3603 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3604 cifs_sb_tcon_pending_wait,
3605 TASK_INTERRUPTIBLE);
3606 if (ret) {
3607 cifs_put_tlink(tlink);
3608 return ERR_PTR(ret);
3609 }
3610
3611 /* if it's good, return it */
3612 if (!IS_ERR(tlink->tl_tcon))
3613 return tlink;
3614
3615 /* return error if we tried this already recently */
3616 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3617 cifs_put_tlink(tlink);
3618 return ERR_PTR(-EACCES);
3619 }
3620
3621 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3622 goto wait_for_construction;
3623 }
3624
3625 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3626 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3627 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3628
3629 if (IS_ERR(tlink->tl_tcon)) {
3630 cifs_put_tlink(tlink);
3631 return ERR_PTR(-EACCES);
3632 }
3633
3634 return tlink;
3635 }
3636
3637 /*
3638 * periodic workqueue job that scans tcon_tree for a superblock and closes
3639 * out tcons.
3640 */
3641 static void
3642 cifs_prune_tlinks(struct work_struct *work)
3643 {
3644 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3645 prune_tlinks.work);
3646 struct rb_root *root = &cifs_sb->tlink_tree;
3647 struct rb_node *node = rb_first(root);
3648 struct rb_node *tmp;
3649 struct tcon_link *tlink;
3650
3651 /*
3652 * Because we drop the spinlock in the loop in order to put the tlink
3653 * it's not guarded against removal of links from the tree. The only
3654 * places that remove entries from the tree are this function and
3655 * umounts. Because this function is non-reentrant and is canceled
3656 * before umount can proceed, this is safe.
3657 */
3658 spin_lock(&cifs_sb->tlink_tree_lock);
3659 node = rb_first(root);
3660 while (node != NULL) {
3661 tmp = node;
3662 node = rb_next(tmp);
3663 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3664
3665 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3666 atomic_read(&tlink->tl_count) != 0 ||
3667 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3668 continue;
3669
3670 cifs_get_tlink(tlink);
3671 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3672 rb_erase(tmp, root);
3673
3674 spin_unlock(&cifs_sb->tlink_tree_lock);
3675 cifs_put_tlink(tlink);
3676 spin_lock(&cifs_sb->tlink_tree_lock);
3677 }
3678 spin_unlock(&cifs_sb->tlink_tree_lock);
3679
3680 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3681 TLINK_IDLE_EXPIRE);
3682 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree