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new buffering logic part 1
[cor_2_6_31.git] / fs / cifs / connect.c
blobfc44d316d0bb4702eaa8d083cf9ed0eb746304ca
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/pagemap.h>
27 #include <linux/ctype.h>
28 #include <linux/utsname.h>
29 #include <linux/mempool.h>
30 #include <linux/delay.h>
31 #include <linux/completion.h>
32 #include <linux/kthread.h>
33 #include <linux/pagevec.h>
34 #include <linux/freezer.h>
35 #include <linux/namei.h>
36 #include <asm/uaccess.h>
37 #include <asm/processor.h>
38 #include <linux/inet.h>
39 #include <net/ipv6.h>
40 #include "cifspdu.h"
41 #include "cifsglob.h"
42 #include "cifsproto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include "ntlmssp.h"
47 #include "nterr.h"
48 #include "rfc1002pdu.h"
49 #include "cn_cifs.h"
50
51 #define CIFS_PORT 445
52 #define RFC1001_PORT 139
53
54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
55 unsigned char *p24);
56
57 extern mempool_t *cifs_req_poolp;
58
59 struct smb_vol {
60 char *username;
61 char *password;
62 char *domainname;
63 char *UNC;
64 char *UNCip;
65 char *iocharset; /* local code page for mapping to and from Unicode */
66 char source_rfc1001_name[16]; /* netbios name of client */
67 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
68 uid_t linux_uid;
69 gid_t linux_gid;
70 mode_t file_mode;
71 mode_t dir_mode;
72 unsigned secFlg;
73 bool retry:1;
74 bool intr:1;
75 bool setuids:1;
76 bool override_uid:1;
77 bool override_gid:1;
78 bool dynperm:1;
79 bool noperm:1;
80 bool no_psx_acl:1; /* set if posix acl support should be disabled */
81 bool cifs_acl:1;
82 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
83 bool server_ino:1; /* use inode numbers from server ie UniqueId */
84 bool direct_io:1;
85 bool remap:1; /* set to remap seven reserved chars in filenames */
86 bool posix_paths:1; /* unset to not ask for posix pathnames. */
87 bool no_linux_ext:1;
88 bool sfu_emul:1;
89 bool nullauth:1; /* attempt to authenticate with null user */
90 bool nocase:1; /* request case insensitive filenames */
91 bool nobrl:1; /* disable sending byte range locks to srv */
92 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
93 bool seal:1; /* request transport encryption on share */
94 bool nodfs:1; /* Do not request DFS, even if available */
95 bool local_lease:1; /* check leases only on local system, not remote */
96 bool noblocksnd:1;
97 bool noautotune:1;
98 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
99 unsigned int rsize;
100 unsigned int wsize;
101 unsigned int sockopt;
102 unsigned short int port;
103 char *prepath;
104 };
105
106 static int ipv4_connect(struct TCP_Server_Info *server);
107 static int ipv6_connect(struct TCP_Server_Info *server);
108
109 /*
110 * cifs tcp session reconnection
111 *
112 * mark tcp session as reconnecting so temporarily locked
113 * mark all smb sessions as reconnecting for tcp session
114 * reconnect tcp session
115 * wake up waiters on reconnection? - (not needed currently)
116 */
117 static int
118 cifs_reconnect(struct TCP_Server_Info *server)
119 {
120 int rc = 0;
121 struct list_head *tmp, *tmp2;
122 struct cifsSesInfo *ses;
123 struct cifsTconInfo *tcon;
124 struct mid_q_entry *mid_entry;
125
126 spin_lock(&GlobalMid_Lock);
127 if (server->tcpStatus == CifsExiting) {
128 /* the demux thread will exit normally
129 next time through the loop */
130 spin_unlock(&GlobalMid_Lock);
131 return rc;
132 } else
133 server->tcpStatus = CifsNeedReconnect;
134 spin_unlock(&GlobalMid_Lock);
135 server->maxBuf = 0;
136
137 cFYI(1, ("Reconnecting tcp session"));
138
139 /* before reconnecting the tcp session, mark the smb session (uid)
140 and the tid bad so they are not used until reconnected */
141 read_lock(&cifs_tcp_ses_lock);
142 list_for_each(tmp, &server->smb_ses_list) {
143 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
144 ses->need_reconnect = true;
145 ses->ipc_tid = 0;
146 list_for_each(tmp2, &ses->tcon_list) {
147 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
148 tcon->need_reconnect = true;
149 }
150 }
151 read_unlock(&cifs_tcp_ses_lock);
152 /* do not want to be sending data on a socket we are freeing */
153 mutex_lock(&server->srv_mutex);
154 if (server->ssocket) {
155 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
156 server->ssocket->flags));
157 kernel_sock_shutdown(server->ssocket, SHUT_WR);
158 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
159 server->ssocket->state,
160 server->ssocket->flags));
161 sock_release(server->ssocket);
162 server->ssocket = NULL;
163 }
164
165 spin_lock(&GlobalMid_Lock);
166 list_for_each(tmp, &server->pending_mid_q) {
167 mid_entry = list_entry(tmp, struct
168 mid_q_entry,
169 qhead);
170 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
171 /* Mark other intransit requests as needing
172 retry so we do not immediately mark the
173 session bad again (ie after we reconnect
174 below) as they timeout too */
175 mid_entry->midState = MID_RETRY_NEEDED;
176 }
177 }
178 spin_unlock(&GlobalMid_Lock);
179 mutex_unlock(&server->srv_mutex);
180
181 while ((server->tcpStatus != CifsExiting) &&
182 (server->tcpStatus != CifsGood)) {
183 try_to_freeze();
184 if (server->addr.sockAddr6.sin6_family == AF_INET6)
185 rc = ipv6_connect(server);
186 else
187 rc = ipv4_connect(server);
188 if (rc) {
189 cFYI(1, ("reconnect error %d", rc));
190 msleep(3000);
191 } else {
192 atomic_inc(&tcpSesReconnectCount);
193 spin_lock(&GlobalMid_Lock);
194 if (server->tcpStatus != CifsExiting)
195 server->tcpStatus = CifsGood;
196 server->sequence_number = 0;
197 spin_unlock(&GlobalMid_Lock);
198 /* atomic_set(&server->inFlight,0);*/
199 wake_up(&server->response_q);
200 }
201 }
202 return rc;
203 }
204
205 /*
206 return codes:
207 0 not a transact2, or all data present
208 >0 transact2 with that much data missing
209 -EINVAL = invalid transact2
210
211 */
212 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
213 {
214 struct smb_t2_rsp *pSMBt;
215 int total_data_size;
216 int data_in_this_rsp;
217 int remaining;
218
219 if (pSMB->Command != SMB_COM_TRANSACTION2)
220 return 0;
221
222 /* check for plausible wct, bcc and t2 data and parm sizes */
223 /* check for parm and data offset going beyond end of smb */
224 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
225 cFYI(1, ("invalid transact2 word count"));
226 return -EINVAL;
227 }
228
229 pSMBt = (struct smb_t2_rsp *)pSMB;
230
231 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
232 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
233
234 remaining = total_data_size - data_in_this_rsp;
235
236 if (remaining == 0)
237 return 0;
238 else if (remaining < 0) {
239 cFYI(1, ("total data %d smaller than data in frame %d",
240 total_data_size, data_in_this_rsp));
241 return -EINVAL;
242 } else {
243 cFYI(1, ("missing %d bytes from transact2, check next response",
244 remaining));
245 if (total_data_size > maxBufSize) {
246 cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
247 total_data_size, maxBufSize));
248 return -EINVAL;
249 }
250 return remaining;
251 }
252 }
253
254 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
255 {
256 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
257 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
258 int total_data_size;
259 int total_in_buf;
260 int remaining;
261 int total_in_buf2;
262 char *data_area_of_target;
263 char *data_area_of_buf2;
264 __u16 byte_count;
265
266 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
267
268 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
269 cFYI(1, ("total data size of primary and secondary t2 differ"));
270 }
271
272 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
273
274 remaining = total_data_size - total_in_buf;
275
276 if (remaining < 0)
277 return -EINVAL;
278
279 if (remaining == 0) /* nothing to do, ignore */
280 return 0;
281
282 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
283 if (remaining < total_in_buf2) {
284 cFYI(1, ("transact2 2nd response contains too much data"));
285 }
286
287 /* find end of first SMB data area */
288 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
289 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
290 /* validate target area */
291
292 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
293 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
294
295 data_area_of_target += total_in_buf;
296
297 /* copy second buffer into end of first buffer */
298 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
299 total_in_buf += total_in_buf2;
300 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
301 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
302 byte_count += total_in_buf2;
303 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
304
305 byte_count = pTargetSMB->smb_buf_length;
306 byte_count += total_in_buf2;
307
308 /* BB also add check that we are not beyond maximum buffer size */
309
310 pTargetSMB->smb_buf_length = byte_count;
311
312 if (remaining == total_in_buf2) {
313 cFYI(1, ("found the last secondary response"));
314 return 0; /* we are done */
315 } else /* more responses to go */
316 return 1;
317
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;
332 struct cifsSesInfo *ses;
333 struct task_struct *task_to_wake = NULL;
334 struct mid_q_entry *mid_entry;
335 char temp;
336 bool isLargeBuf = false;
337 bool isMultiRsp;
338 int reconnect;
339
340 current->flags |= PF_MEMALLOC;
341 cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
342
343 length = atomic_inc_return(&tcpSesAllocCount);
344 if (length > 1)
345 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
346 GFP_KERNEL);
347
348 set_freezable();
349 while (server->tcpStatus != CifsExiting) {
350 if (try_to_freeze())
351 continue;
352 if (bigbuf == NULL) {
353 bigbuf = cifs_buf_get();
354 if (!bigbuf) {
355 cERROR(1, ("No memory for large SMB response"));
356 msleep(3000);
357 /* retry will check if exiting */
358 continue;
359 }
360 } else if (isLargeBuf) {
361 /* we are reusing a dirty large buf, clear its start */
362 memset(bigbuf, 0, sizeof(struct smb_hdr));
363 }
364
365 if (smallbuf == NULL) {
366 smallbuf = cifs_small_buf_get();
367 if (!smallbuf) {
368 cERROR(1, ("No memory for SMB response"));
369 msleep(1000);
370 /* retry will check if exiting */
371 continue;
372 }
373 /* beginning of smb buffer is cleared in our buf_get */
374 } else /* if existing small buf clear beginning */
375 memset(smallbuf, 0, sizeof(struct smb_hdr));
376
377 isLargeBuf = false;
378 isMultiRsp = false;
379 smb_buffer = smallbuf;
380 iov.iov_base = smb_buffer;
381 iov.iov_len = 4;
382 smb_msg.msg_control = NULL;
383 smb_msg.msg_controllen = 0;
384 pdu_length = 4; /* enough to get RFC1001 header */
385 incomplete_rcv:
386 length =
387 kernel_recvmsg(csocket, &smb_msg,
388 &iov, 1, pdu_length, 0 /* BB other flags? */);
389
390 if (server->tcpStatus == CifsExiting) {
391 break;
392 } else if (server->tcpStatus == CifsNeedReconnect) {
393 cFYI(1, ("Reconnect after server stopped responding"));
394 cifs_reconnect(server);
395 cFYI(1, ("call to reconnect done"));
396 csocket = server->ssocket;
397 continue;
398 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
399 msleep(1); /* minimum sleep to prevent looping
400 allowing socket to clear and app threads to set
401 tcpStatus CifsNeedReconnect if server hung */
402 if (pdu_length < 4) {
403 iov.iov_base = (4 - pdu_length) +
404 (char *)smb_buffer;
405 iov.iov_len = pdu_length;
406 smb_msg.msg_control = NULL;
407 smb_msg.msg_controllen = 0;
408 goto incomplete_rcv;
409 } else
410 continue;
411 } else if (length <= 0) {
412 if (server->tcpStatus == CifsNew) {
413 cFYI(1, ("tcp session abend after SMBnegprot"));
414 /* some servers kill the TCP session rather than
415 returning an SMB negprot error, in which
416 case reconnecting here is not going to help,
417 and so simply return error to mount */
418 break;
419 }
420 if (!try_to_freeze() && (length == -EINTR)) {
421 cFYI(1, ("cifsd thread killed"));
422 break;
423 }
424 cFYI(1, ("Reconnect after unexpected peek error %d",
425 length));
426 cifs_reconnect(server);
427 csocket = server->ssocket;
428 wake_up(&server->response_q);
429 continue;
430 } else if (length < pdu_length) {
431 cFYI(1, ("requested %d bytes but only got %d bytes",
432 pdu_length, length));
433 pdu_length -= length;
434 msleep(1);
435 goto incomplete_rcv;
436 }
437
438 /* The right amount was read from socket - 4 bytes */
439 /* so we can now interpret the length field */
440
441 /* the first byte big endian of the length field,
442 is actually not part of the length but the type
443 with the most common, zero, as regular data */
444 temp = *((char *) smb_buffer);
445
446 /* Note that FC 1001 length is big endian on the wire,
447 but we convert it here so it is always manipulated
448 as host byte order */
449 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
450 smb_buffer->smb_buf_length = pdu_length;
451
452 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
453
454 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
455 continue;
456 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
457 cFYI(1, ("Good RFC 1002 session rsp"));
458 continue;
459 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
460 /* we get this from Windows 98 instead of
461 an error on SMB negprot response */
462 cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
463 pdu_length));
464 if (server->tcpStatus == CifsNew) {
465 /* if nack on negprot (rather than
466 ret of smb negprot error) reconnecting
467 not going to help, ret error to mount */
468 break;
469 } else {
470 /* give server a second to
471 clean up before reconnect attempt */
472 msleep(1000);
473 /* always try 445 first on reconnect
474 since we get NACK on some if we ever
475 connected to port 139 (the NACK is
476 since we do not begin with RFC1001
477 session initialize frame) */
478 server->addr.sockAddr.sin_port =
479 htons(CIFS_PORT);
480 cifs_reconnect(server);
481 csocket = server->ssocket;
482 wake_up(&server->response_q);
483 continue;
484 }
485 } else if (temp != (char) 0) {
486 cERROR(1, ("Unknown RFC 1002 frame"));
487 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
488 length);
489 cifs_reconnect(server);
490 csocket = server->ssocket;
491 continue;
492 }
493
494 /* else we have an SMB response */
495 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
496 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
497 cERROR(1, ("Invalid size SMB length %d pdu_length %d",
498 length, pdu_length+4));
499 cifs_reconnect(server);
500 csocket = server->ssocket;
501 wake_up(&server->response_q);
502 continue;
503 }
504
505 /* else length ok */
506 reconnect = 0;
507
508 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
509 isLargeBuf = true;
510 memcpy(bigbuf, smallbuf, 4);
511 smb_buffer = bigbuf;
512 }
513 length = 0;
514 iov.iov_base = 4 + (char *)smb_buffer;
515 iov.iov_len = pdu_length;
516 for (total_read = 0; total_read < pdu_length;
517 total_read += length) {
518 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
519 pdu_length - total_read, 0);
520 if ((server->tcpStatus == CifsExiting) ||
521 (length == -EINTR)) {
522 /* then will exit */
523 reconnect = 2;
524 break;
525 } else if (server->tcpStatus == CifsNeedReconnect) {
526 cifs_reconnect(server);
527 csocket = server->ssocket;
528 /* Reconnect wakes up rspns q */
529 /* Now we will reread sock */
530 reconnect = 1;
531 break;
532 } else if ((length == -ERESTARTSYS) ||
533 (length == -EAGAIN)) {
534 msleep(1); /* minimum sleep to prevent looping,
535 allowing socket to clear and app
536 threads to set tcpStatus
537 CifsNeedReconnect if server hung*/
538 length = 0;
539 continue;
540 } else if (length <= 0) {
541 cERROR(1, ("Received no data, expecting %d",
542 pdu_length - total_read));
543 cifs_reconnect(server);
544 csocket = server->ssocket;
545 reconnect = 1;
546 break;
547 }
548 }
549 if (reconnect == 2)
550 break;
551 else if (reconnect == 1)
552 continue;
553
554 length += 4; /* account for rfc1002 hdr */
555
556
557 dump_smb(smb_buffer, length);
558 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
559 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
560 continue;
561 }
562
563
564 task_to_wake = NULL;
565 spin_lock(&GlobalMid_Lock);
566 list_for_each(tmp, &server->pending_mid_q) {
567 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
568
569 if ((mid_entry->mid == smb_buffer->Mid) &&
570 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
571 (mid_entry->command == smb_buffer->Command)) {
572 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
573 /* We have a multipart transact2 resp */
574 isMultiRsp = true;
575 if (mid_entry->resp_buf) {
576 /* merge response - fix up 1st*/
577 if (coalesce_t2(smb_buffer,
578 mid_entry->resp_buf)) {
579 mid_entry->multiRsp =
580 true;
581 break;
582 } else {
583 /* all parts received */
584 mid_entry->multiEnd =
585 true;
586 goto multi_t2_fnd;
587 }
588 } else {
589 if (!isLargeBuf) {
590 cERROR(1,("1st trans2 resp needs bigbuf"));
591 /* BB maybe we can fix this up, switch
592 to already allocated large buffer? */
593 } else {
594 /* Have first buffer */
595 mid_entry->resp_buf =
596 smb_buffer;
597 mid_entry->largeBuf =
598 true;
599 bigbuf = NULL;
600 }
601 }
602 break;
603 }
604 mid_entry->resp_buf = smb_buffer;
605 mid_entry->largeBuf = isLargeBuf;
606 multi_t2_fnd:
607 task_to_wake = mid_entry->tsk;
608 mid_entry->midState = MID_RESPONSE_RECEIVED;
609 #ifdef CONFIG_CIFS_STATS2
610 mid_entry->when_received = jiffies;
611 #endif
612 /* so we do not time out requests to server
613 which is still responding (since server could
614 be busy but not dead) */
615 server->lstrp = jiffies;
616 break;
617 }
618 }
619 spin_unlock(&GlobalMid_Lock);
620 if (task_to_wake) {
621 /* Was previous buf put in mpx struct for multi-rsp? */
622 if (!isMultiRsp) {
623 /* smb buffer will be freed by user thread */
624 if (isLargeBuf)
625 bigbuf = NULL;
626 else
627 smallbuf = NULL;
628 }
629 wake_up_process(task_to_wake);
630 } else if (!is_valid_oplock_break(smb_buffer, server) &&
631 !isMultiRsp) {
632 cERROR(1, ("No task to wake, unknown frame received! "
633 "NumMids %d", midCount.counter));
634 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
635 sizeof(struct smb_hdr));
636 #ifdef CONFIG_CIFS_DEBUG2
637 cifs_dump_detail(smb_buffer);
638 cifs_dump_mids(server);
639 #endif /* CIFS_DEBUG2 */
640
641 }
642 } /* end while !EXITING */
643
644 /* take it off the list, if it's not already */
645 write_lock(&cifs_tcp_ses_lock);
646 list_del_init(&server->tcp_ses_list);
647 write_unlock(&cifs_tcp_ses_lock);
648
649 spin_lock(&GlobalMid_Lock);
650 server->tcpStatus = CifsExiting;
651 spin_unlock(&GlobalMid_Lock);
652 wake_up_all(&server->response_q);
653
654 /* check if we have blocked requests that need to free */
655 /* Note that cifs_max_pending is normally 50, but
656 can be set at module install time to as little as two */
657 spin_lock(&GlobalMid_Lock);
658 if (atomic_read(&server->inFlight) >= cifs_max_pending)
659 atomic_set(&server->inFlight, cifs_max_pending - 1);
660 /* We do not want to set the max_pending too low or we
661 could end up with the counter going negative */
662 spin_unlock(&GlobalMid_Lock);
663 /* Although there should not be any requests blocked on
664 this queue it can not hurt to be paranoid and try to wake up requests
665 that may haven been blocked when more than 50 at time were on the wire
666 to the same server - they now will see the session is in exit state
667 and get out of SendReceive. */
668 wake_up_all(&server->request_q);
669 /* give those requests time to exit */
670 msleep(125);
671
672 if (server->ssocket) {
673 sock_release(csocket);
674 server->ssocket = NULL;
675 }
676 /* buffer usuallly freed in free_mid - need to free it here on exit */
677 cifs_buf_release(bigbuf);
678 if (smallbuf) /* no sense logging a debug message if NULL */
679 cifs_small_buf_release(smallbuf);
680
681 /*
682 * BB: we shouldn't have to do any of this. It shouldn't be
683 * possible to exit from the thread with active SMB sessions
684 */
685 read_lock(&cifs_tcp_ses_lock);
686 if (list_empty(&server->pending_mid_q)) {
687 /* loop through server session structures attached to this and
688 mark them dead */
689 list_for_each(tmp, &server->smb_ses_list) {
690 ses = list_entry(tmp, struct cifsSesInfo,
691 smb_ses_list);
692 ses->status = CifsExiting;
693 ses->server = NULL;
694 }
695 read_unlock(&cifs_tcp_ses_lock);
696 } else {
697 /* although we can not zero the server struct pointer yet,
698 since there are active requests which may depnd on them,
699 mark the corresponding SMB sessions as exiting too */
700 list_for_each(tmp, &server->smb_ses_list) {
701 ses = list_entry(tmp, struct cifsSesInfo,
702 smb_ses_list);
703 ses->status = CifsExiting;
704 }
705
706 spin_lock(&GlobalMid_Lock);
707 list_for_each(tmp, &server->pending_mid_q) {
708 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
709 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
710 cFYI(1, ("Clearing Mid 0x%x - waking up ",
711 mid_entry->mid));
712 task_to_wake = mid_entry->tsk;
713 if (task_to_wake)
714 wake_up_process(task_to_wake);
715 }
716 }
717 spin_unlock(&GlobalMid_Lock);
718 read_unlock(&cifs_tcp_ses_lock);
719 /* 1/8th of sec is more than enough time for them to exit */
720 msleep(125);
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 /* mpx threads have not exited yet give them
725 at least the smb send timeout time for long ops */
726 /* due to delays on oplock break requests, we need
727 to wait at least 45 seconds before giving up
728 on a request getting a response and going ahead
729 and killing cifsd */
730 cFYI(1, ("Wait for exit from demultiplex thread"));
731 msleep(46000);
732 /* if threads still have not exited they are probably never
733 coming home not much else we can do but free the memory */
734 }
735
736 /* last chance to mark ses pointers invalid
737 if there are any pointing to this (e.g
738 if a crazy root user tried to kill cifsd
739 kernel thread explicitly this might happen) */
740 /* BB: This shouldn't be necessary, see above */
741 read_lock(&cifs_tcp_ses_lock);
742 list_for_each(tmp, &server->smb_ses_list) {
743 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
744 ses->server = NULL;
745 }
746 read_unlock(&cifs_tcp_ses_lock);
747
748 kfree(server->hostname);
749 task_to_wake = xchg(&server->tsk, NULL);
750 kfree(server);
751
752 length = atomic_dec_return(&tcpSesAllocCount);
753 if (length > 0)
754 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
755 GFP_KERNEL);
756
757 /* if server->tsk was NULL then wait for a signal before exiting */
758 if (!task_to_wake) {
759 set_current_state(TASK_INTERRUPTIBLE);
760 while (!signal_pending(current)) {
761 schedule();
762 set_current_state(TASK_INTERRUPTIBLE);
763 }
764 set_current_state(TASK_RUNNING);
765 }
766
767 module_put_and_exit(0);
768 }
769
770 /* extract the host portion of the UNC string */
771 static char *
772 extract_hostname(const char *unc)
773 {
774 const char *src;
775 char *dst, *delim;
776 unsigned int len;
777
778 /* skip double chars at beginning of string */
779 /* BB: check validity of these bytes? */
780 src = unc + 2;
781
782 /* delimiter between hostname and sharename is always '\\' now */
783 delim = strchr(src, '\\');
784 if (!delim)
785 return ERR_PTR(-EINVAL);
786
787 len = delim - src;
788 dst = kmalloc((len + 1), GFP_KERNEL);
789 if (dst == NULL)
790 return ERR_PTR(-ENOMEM);
791
792 memcpy(dst, src, len);
793 dst[len] = '\0';
794
795 return dst;
796 }
797
798 static int
799 cifs_parse_mount_options(char *options, const char *devname,
800 struct smb_vol *vol)
801 {
802 char *value;
803 char *data;
804 unsigned int temp_len, i, j;
805 char separator[2];
806
807 separator[0] = ',';
808 separator[1] = 0;
809
810 if (Local_System_Name[0] != 0)
811 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
812 else {
813 char *nodename = utsname()->nodename;
814 int n = strnlen(nodename, 15);
815 memset(vol->source_rfc1001_name, 0x20, 15);
816 for (i = 0; i < n; i++) {
817 /* does not have to be perfect mapping since field is
818 informational, only used for servers that do not support
819 port 445 and it can be overridden at mount time */
820 vol->source_rfc1001_name[i] = toupper(nodename[i]);
821 }
822 }
823 vol->source_rfc1001_name[15] = 0;
824 /* null target name indicates to use *SMBSERVR default called name
825 if we end up sending RFC1001 session initialize */
826 vol->target_rfc1001_name[0] = 0;
827 vol->linux_uid = current_uid(); /* use current_euid() instead? */
828 vol->linux_gid = current_gid();
829
830 /* default to only allowing write access to owner of the mount */
831 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
832
833 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
834 /* default is always to request posix paths. */
835 vol->posix_paths = 1;
836 /* default to using server inode numbers where available */
837 vol->server_ino = 1;
838
839 if (!options)
840 return 1;
841
842 if (strncmp(options, "sep=", 4) == 0) {
843 if (options[4] != 0) {
844 separator[0] = options[4];
845 options += 5;
846 } else {
847 cFYI(1, ("Null separator not allowed"));
848 }
849 }
850
851 while ((data = strsep(&options, separator)) != NULL) {
852 if (!*data)
853 continue;
854 if ((value = strchr(data, '=')) != NULL)
855 *value++ = '\0';
856
857 /* Have to parse this before we parse for "user" */
858 if (strnicmp(data, "user_xattr", 10) == 0) {
859 vol->no_xattr = 0;
860 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
861 vol->no_xattr = 1;
862 } else if (strnicmp(data, "user", 4) == 0) {
863 if (!value) {
864 printk(KERN_WARNING
865 "CIFS: invalid or missing username\n");
866 return 1; /* needs_arg; */
867 } else if (!*value) {
868 /* null user, ie anonymous, authentication */
869 vol->nullauth = 1;
870 }
871 if (strnlen(value, 200) < 200) {
872 vol->username = value;
873 } else {
874 printk(KERN_WARNING "CIFS: username too long\n");
875 return 1;
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+1] == separator[0])) {
907 /* reinsert comma */
908 value[temp_len] = separator[0];
909 temp_len += 2; /* move after second comma */
910 while (value[temp_len] != 0) {
911 if (value[temp_len] == separator[0]) {
912 if (value[temp_len+1] ==
913 separator[0]) {
914 /* skip second comma */
915 temp_len++;
916 } else {
917 /* single comma indicating start
918 of next parm */
919 break;
920 }
921 }
922 temp_len++;
923 }
924 if (value[temp_len] == 0) {
925 options = NULL;
926 } else {
927 value[temp_len] = 0;
928 /* point option to start of next parm */
929 options = value + temp_len + 1;
930 }
931 /* go from value to value + temp_len condensing
932 double commas to singles. Note that this ends up
933 allocating a few bytes too many, which is ok */
934 vol->password = kzalloc(temp_len, GFP_KERNEL);
935 if (vol->password == NULL) {
936 printk(KERN_WARNING "CIFS: no memory "
937 "for password\n");
938 return 1;
939 }
940 for (i = 0, j = 0; i < temp_len; i++, j++) {
941 vol->password[j] = value[i];
942 if (value[i] == separator[0]
943 && value[i+1] == separator[0]) {
944 /* skip second comma */
945 i++;
946 }
947 }
948 vol->password[j] = 0;
949 } else {
950 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
951 if (vol->password == NULL) {
952 printk(KERN_WARNING "CIFS: no memory "
953 "for password\n");
954 return 1;
955 }
956 strcpy(vol->password, value);
957 }
958 } else if (!strnicmp(data, "ip", 2) ||
959 !strnicmp(data, "addr", 4)) {
960 if (!value || !*value) {
961 vol->UNCip = NULL;
962 } else if (strnlen(value, INET6_ADDRSTRLEN) <
963 INET6_ADDRSTRLEN) {
964 vol->UNCip = value;
965 } else {
966 printk(KERN_WARNING "CIFS: ip address "
967 "too long\n");
968 return 1;
969 }
970 } else if (strnicmp(data, "sec", 3) == 0) {
971 if (!value || !*value) {
972 cERROR(1, ("no security value specified"));
973 continue;
974 } else if (strnicmp(value, "krb5i", 5) == 0) {
975 vol->secFlg |= CIFSSEC_MAY_KRB5 |
976 CIFSSEC_MUST_SIGN;
977 } else if (strnicmp(value, "krb5p", 5) == 0) {
978 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
979 CIFSSEC_MAY_KRB5; */
980 cERROR(1, ("Krb5 cifs privacy not supported"));
981 return 1;
982 } else if (strnicmp(value, "krb5", 4) == 0) {
983 vol->secFlg |= CIFSSEC_MAY_KRB5;
984 #ifdef CONFIG_CIFS_EXPERIMENTAL
985 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
986 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
987 CIFSSEC_MUST_SIGN;
988 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
989 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
990 #endif
991 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
992 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
993 CIFSSEC_MUST_SIGN;
994 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
995 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
996 } else if (strnicmp(value, "ntlmi", 5) == 0) {
997 vol->secFlg |= CIFSSEC_MAY_NTLM |
998 CIFSSEC_MUST_SIGN;
999 } else if (strnicmp(value, "ntlm", 4) == 0) {
1000 /* ntlm is default so can be turned off too */
1001 vol->secFlg |= CIFSSEC_MAY_NTLM;
1002 } else if (strnicmp(value, "nontlm", 6) == 0) {
1003 /* BB is there a better way to do this? */
1004 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1005 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1006 } else if (strnicmp(value, "lanman", 6) == 0) {
1007 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1008 #endif
1009 } else if (strnicmp(value, "none", 4) == 0) {
1010 vol->nullauth = 1;
1011 } else {
1012 cERROR(1, ("bad security option: %s", value));
1013 return 1;
1014 }
1015 } else if ((strnicmp(data, "unc", 3) == 0)
1016 || (strnicmp(data, "target", 6) == 0)
1017 || (strnicmp(data, "path", 4) == 0)) {
1018 if (!value || !*value) {
1019 printk(KERN_WARNING "CIFS: invalid path to "
1020 "network resource\n");
1021 return 1; /* needs_arg; */
1022 }
1023 if ((temp_len = strnlen(value, 300)) < 300) {
1024 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1025 if (vol->UNC == NULL)
1026 return 1;
1027 strcpy(vol->UNC, value);
1028 if (strncmp(vol->UNC, "//", 2) == 0) {
1029 vol->UNC[0] = '\\';
1030 vol->UNC[1] = '\\';
1031 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1032 printk(KERN_WARNING
1033 "CIFS: UNC Path does not begin "
1034 "with // or \\\\ \n");
1035 return 1;
1036 }
1037 } else {
1038 printk(KERN_WARNING "CIFS: UNC name too long\n");
1039 return 1;
1040 }
1041 } else if ((strnicmp(data, "domain", 3) == 0)
1042 || (strnicmp(data, "workgroup", 5) == 0)) {
1043 if (!value || !*value) {
1044 printk(KERN_WARNING "CIFS: invalid domain name\n");
1045 return 1; /* needs_arg; */
1046 }
1047 /* BB are there cases in which a comma can be valid in
1048 a domain name and need special handling? */
1049 if (strnlen(value, 256) < 256) {
1050 vol->domainname = value;
1051 cFYI(1, ("Domain name set"));
1052 } else {
1053 printk(KERN_WARNING "CIFS: domain name too "
1054 "long\n");
1055 return 1;
1056 }
1057 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1058 if (!value || !*value) {
1059 printk(KERN_WARNING
1060 "CIFS: invalid path prefix\n");
1061 return 1; /* needs_argument */
1062 }
1063 if ((temp_len = strnlen(value, 1024)) < 1024) {
1064 if (value[0] != '/')
1065 temp_len++; /* missing leading slash */
1066 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1067 if (vol->prepath == NULL)
1068 return 1;
1069 if (value[0] != '/') {
1070 vol->prepath[0] = '/';
1071 strcpy(vol->prepath+1, value);
1072 } else
1073 strcpy(vol->prepath, value);
1074 cFYI(1, ("prefix path %s", vol->prepath));
1075 } else {
1076 printk(KERN_WARNING "CIFS: prefix too long\n");
1077 return 1;
1078 }
1079 } else if (strnicmp(data, "iocharset", 9) == 0) {
1080 if (!value || !*value) {
1081 printk(KERN_WARNING "CIFS: invalid iocharset "
1082 "specified\n");
1083 return 1; /* needs_arg; */
1084 }
1085 if (strnlen(value, 65) < 65) {
1086 if (strnicmp(value, "default", 7))
1087 vol->iocharset = value;
1088 /* if iocharset not set then load_nls_default
1089 is used by caller */
1090 cFYI(1, ("iocharset set to %s", value));
1091 } else {
1092 printk(KERN_WARNING "CIFS: iocharset name "
1093 "too long.\n");
1094 return 1;
1095 }
1096 } else if (strnicmp(data, "uid", 3) == 0) {
1097 if (value && *value)
1098 vol->linux_uid =
1099 simple_strtoul(value, &value, 0);
1100 } else if (strnicmp(data, "forceuid", 8) == 0) {
1101 vol->override_uid = 1;
1102 } else if (strnicmp(data, "gid", 3) == 0) {
1103 if (value && *value)
1104 vol->linux_gid =
1105 simple_strtoul(value, &value, 0);
1106 } else if (strnicmp(data, "forcegid", 8) == 0) {
1107 vol->override_gid = 1;
1108 } else if (strnicmp(data, "file_mode", 4) == 0) {
1109 if (value && *value) {
1110 vol->file_mode =
1111 simple_strtoul(value, &value, 0);
1112 }
1113 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1114 if (value && *value) {
1115 vol->dir_mode =
1116 simple_strtoul(value, &value, 0);
1117 }
1118 } else if (strnicmp(data, "dirmode", 4) == 0) {
1119 if (value && *value) {
1120 vol->dir_mode =
1121 simple_strtoul(value, &value, 0);
1122 }
1123 } else if (strnicmp(data, "port", 4) == 0) {
1124 if (value && *value) {
1125 vol->port =
1126 simple_strtoul(value, &value, 0);
1127 }
1128 } else if (strnicmp(data, "rsize", 5) == 0) {
1129 if (value && *value) {
1130 vol->rsize =
1131 simple_strtoul(value, &value, 0);
1132 }
1133 } else if (strnicmp(data, "wsize", 5) == 0) {
1134 if (value && *value) {
1135 vol->wsize =
1136 simple_strtoul(value, &value, 0);
1137 }
1138 } else if (strnicmp(data, "sockopt", 5) == 0) {
1139 if (value && *value) {
1140 vol->sockopt =
1141 simple_strtoul(value, &value, 0);
1142 }
1143 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1144 if (!value || !*value || (*value == ' ')) {
1145 cFYI(1, ("invalid (empty) netbiosname"));
1146 } else {
1147 memset(vol->source_rfc1001_name, 0x20, 15);
1148 for (i = 0; i < 15; i++) {
1149 /* BB are there cases in which a comma can be
1150 valid in this workstation netbios name (and need
1151 special handling)? */
1152
1153 /* We do not uppercase netbiosname for user */
1154 if (value[i] == 0)
1155 break;
1156 else
1157 vol->source_rfc1001_name[i] =
1158 value[i];
1159 }
1160 /* The string has 16th byte zero still from
1161 set at top of the function */
1162 if ((i == 15) && (value[i] != 0))
1163 printk(KERN_WARNING "CIFS: netbiosname"
1164 " longer than 15 truncated.\n");
1165 }
1166 } else if (strnicmp(data, "servern", 7) == 0) {
1167 /* servernetbiosname specified override *SMBSERVER */
1168 if (!value || !*value || (*value == ' ')) {
1169 cFYI(1, ("empty server netbiosname specified"));
1170 } else {
1171 /* last byte, type, is 0x20 for servr type */
1172 memset(vol->target_rfc1001_name, 0x20, 16);
1173
1174 for (i = 0; i < 15; i++) {
1175 /* BB are there cases in which a comma can be
1176 valid in this workstation netbios name
1177 (and need special handling)? */
1178
1179 /* user or mount helper must uppercase
1180 the netbiosname */
1181 if (value[i] == 0)
1182 break;
1183 else
1184 vol->target_rfc1001_name[i] =
1185 value[i];
1186 }
1187 /* The string has 16th byte zero still from
1188 set at top of the function */
1189 if ((i == 15) && (value[i] != 0))
1190 printk(KERN_WARNING "CIFS: server net"
1191 "biosname longer than 15 truncated.\n");
1192 }
1193 } else if (strnicmp(data, "credentials", 4) == 0) {
1194 /* ignore */
1195 } else if (strnicmp(data, "version", 3) == 0) {
1196 /* ignore */
1197 } else if (strnicmp(data, "guest", 5) == 0) {
1198 /* ignore */
1199 } else if (strnicmp(data, "rw", 2) == 0) {
1200 /* ignore */
1201 } else if (strnicmp(data, "ro", 2) == 0) {
1202 /* ignore */
1203 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1204 vol->noblocksnd = 1;
1205 } else if (strnicmp(data, "noautotune", 10) == 0) {
1206 vol->noautotune = 1;
1207 } else if ((strnicmp(data, "suid", 4) == 0) ||
1208 (strnicmp(data, "nosuid", 6) == 0) ||
1209 (strnicmp(data, "exec", 4) == 0) ||
1210 (strnicmp(data, "noexec", 6) == 0) ||
1211 (strnicmp(data, "nodev", 5) == 0) ||
1212 (strnicmp(data, "noauto", 6) == 0) ||
1213 (strnicmp(data, "dev", 3) == 0)) {
1214 /* The mount tool or mount.cifs helper (if present)
1215 uses these opts to set flags, and the flags are read
1216 by the kernel vfs layer before we get here (ie
1217 before read super) so there is no point trying to
1218 parse these options again and set anything and it
1219 is ok to just ignore them */
1220 continue;
1221 } else if (strnicmp(data, "hard", 4) == 0) {
1222 vol->retry = 1;
1223 } else if (strnicmp(data, "soft", 4) == 0) {
1224 vol->retry = 0;
1225 } else if (strnicmp(data, "perm", 4) == 0) {
1226 vol->noperm = 0;
1227 } else if (strnicmp(data, "noperm", 6) == 0) {
1228 vol->noperm = 1;
1229 } else if (strnicmp(data, "mapchars", 8) == 0) {
1230 vol->remap = 1;
1231 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1232 vol->remap = 0;
1233 } else if (strnicmp(data, "sfu", 3) == 0) {
1234 vol->sfu_emul = 1;
1235 } else if (strnicmp(data, "nosfu", 5) == 0) {
1236 vol->sfu_emul = 0;
1237 } else if (strnicmp(data, "nodfs", 5) == 0) {
1238 vol->nodfs = 1;
1239 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1240 vol->posix_paths = 1;
1241 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1242 vol->posix_paths = 0;
1243 } else if (strnicmp(data, "nounix", 6) == 0) {
1244 vol->no_linux_ext = 1;
1245 } else if (strnicmp(data, "nolinux", 7) == 0) {
1246 vol->no_linux_ext = 1;
1247 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1248 (strnicmp(data, "ignorecase", 10) == 0)) {
1249 vol->nocase = 1;
1250 } else if (strnicmp(data, "brl", 3) == 0) {
1251 vol->nobrl = 0;
1252 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1253 (strnicmp(data, "nolock", 6) == 0)) {
1254 vol->nobrl = 1;
1255 /* turn off mandatory locking in mode
1256 if remote locking is turned off since the
1257 local vfs will do advisory */
1258 if (vol->file_mode ==
1259 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1260 vol->file_mode = S_IALLUGO;
1261 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1262 /* will take the shorter form "forcemand" as well */
1263 /* This mount option will force use of mandatory
1264 (DOS/Windows style) byte range locks, instead of
1265 using posix advisory byte range locks, even if the
1266 Unix extensions are available and posix locks would
1267 be supported otherwise. If Unix extensions are not
1268 negotiated this has no effect since mandatory locks
1269 would be used (mandatory locks is all that those
1270 those servers support) */
1271 vol->mand_lock = 1;
1272 } else if (strnicmp(data, "setuids", 7) == 0) {
1273 vol->setuids = 1;
1274 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1275 vol->setuids = 0;
1276 } else if (strnicmp(data, "dynperm", 7) == 0) {
1277 vol->dynperm = true;
1278 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1279 vol->dynperm = false;
1280 } else if (strnicmp(data, "nohard", 6) == 0) {
1281 vol->retry = 0;
1282 } else if (strnicmp(data, "nosoft", 6) == 0) {
1283 vol->retry = 1;
1284 } else if (strnicmp(data, "nointr", 6) == 0) {
1285 vol->intr = 0;
1286 } else if (strnicmp(data, "intr", 4) == 0) {
1287 vol->intr = 1;
1288 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1289 vol->nostrictsync = 1;
1290 } else if (strnicmp(data, "strictsync", 10) == 0) {
1291 vol->nostrictsync = 0;
1292 } else if (strnicmp(data, "serverino", 7) == 0) {
1293 vol->server_ino = 1;
1294 } else if (strnicmp(data, "noserverino", 9) == 0) {
1295 vol->server_ino = 0;
1296 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1297 vol->cifs_acl = 1;
1298 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1299 vol->cifs_acl = 0;
1300 } else if (strnicmp(data, "acl", 3) == 0) {
1301 vol->no_psx_acl = 0;
1302 } else if (strnicmp(data, "noacl", 5) == 0) {
1303 vol->no_psx_acl = 1;
1304 #ifdef CONFIG_CIFS_EXPERIMENTAL
1305 } else if (strnicmp(data, "locallease", 6) == 0) {
1306 vol->local_lease = 1;
1307 #endif
1308 } else if (strnicmp(data, "sign", 4) == 0) {
1309 vol->secFlg |= CIFSSEC_MUST_SIGN;
1310 } else if (strnicmp(data, "seal", 4) == 0) {
1311 /* we do not do the following in secFlags because seal
1312 is a per tree connection (mount) not a per socket
1313 or per-smb connection option in the protocol */
1314 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1315 vol->seal = 1;
1316 } else if (strnicmp(data, "direct", 6) == 0) {
1317 vol->direct_io = 1;
1318 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1319 vol->direct_io = 1;
1320 } else if (strnicmp(data, "noac", 4) == 0) {
1321 printk(KERN_WARNING "CIFS: Mount option noac not "
1322 "supported. Instead set "
1323 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1324 } else
1325 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1326 data);
1327 }
1328 if (vol->UNC == NULL) {
1329 if (devname == NULL) {
1330 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1331 "target\n");
1332 return 1;
1333 }
1334 if ((temp_len = strnlen(devname, 300)) < 300) {
1335 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1336 if (vol->UNC == NULL)
1337 return 1;
1338 strcpy(vol->UNC, devname);
1339 if (strncmp(vol->UNC, "//", 2) == 0) {
1340 vol->UNC[0] = '\\';
1341 vol->UNC[1] = '\\';
1342 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1343 printk(KERN_WARNING "CIFS: UNC Path does not "
1344 "begin with // or \\\\ \n");
1345 return 1;
1346 }
1347 value = strpbrk(vol->UNC+2, "/\\");
1348 if (value)
1349 *value = '\\';
1350 } else {
1351 printk(KERN_WARNING "CIFS: UNC name too long\n");
1352 return 1;
1353 }
1354 }
1355 if (vol->UNCip == NULL)
1356 vol->UNCip = &vol->UNC[2];
1357
1358 return 0;
1359 }
1360
1361 static struct TCP_Server_Info *
1362 cifs_find_tcp_session(struct sockaddr_storage *addr)
1363 {
1364 struct list_head *tmp;
1365 struct TCP_Server_Info *server;
1366 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1367 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1368
1369 write_lock(&cifs_tcp_ses_lock);
1370 list_for_each(tmp, &cifs_tcp_ses_list) {
1371 server = list_entry(tmp, struct TCP_Server_Info,
1372 tcp_ses_list);
1373 /*
1374 * the demux thread can exit on its own while still in CifsNew
1375 * so don't accept any sockets in that state. Since the
1376 * tcpStatus never changes back to CifsNew it's safe to check
1377 * for this without a lock.
1378 */
1379 if (server->tcpStatus == CifsNew)
1380 continue;
1381
1382 if (addr->ss_family == AF_INET &&
1383 (addr4->sin_addr.s_addr !=
1384 server->addr.sockAddr.sin_addr.s_addr))
1385 continue;
1386 else if (addr->ss_family == AF_INET6 &&
1387 (!ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1388 &addr6->sin6_addr) ||
1389 server->addr.sockAddr6.sin6_scope_id !=
1390 addr6->sin6_scope_id))
1391 continue;
1392
1393 ++server->srv_count;
1394 write_unlock(&cifs_tcp_ses_lock);
1395 cFYI(1, ("Existing tcp session with server found"));
1396 return server;
1397 }
1398 write_unlock(&cifs_tcp_ses_lock);
1399 return NULL;
1400 }
1401
1402 static void
1403 cifs_put_tcp_session(struct TCP_Server_Info *server)
1404 {
1405 struct task_struct *task;
1406
1407 write_lock(&cifs_tcp_ses_lock);
1408 if (--server->srv_count > 0) {
1409 write_unlock(&cifs_tcp_ses_lock);
1410 return;
1411 }
1412
1413 list_del_init(&server->tcp_ses_list);
1414 write_unlock(&cifs_tcp_ses_lock);
1415
1416 spin_lock(&GlobalMid_Lock);
1417 server->tcpStatus = CifsExiting;
1418 spin_unlock(&GlobalMid_Lock);
1419
1420 task = xchg(&server->tsk, NULL);
1421 if (task)
1422 force_sig(SIGKILL, task);
1423 }
1424
1425 static struct TCP_Server_Info *
1426 cifs_get_tcp_session(struct smb_vol *volume_info)
1427 {
1428 struct TCP_Server_Info *tcp_ses = NULL;
1429 struct sockaddr_storage addr;
1430 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1431 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1432 int rc;
1433
1434 memset(&addr, 0, sizeof(struct sockaddr_storage));
1435
1436 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1437
1438 if (volume_info->UNCip && volume_info->UNC) {
1439 rc = cifs_convert_address(volume_info->UNCip, &addr);
1440 if (!rc) {
1441 /* we failed translating address */
1442 rc = -EINVAL;
1443 goto out_err;
1444 }
1445 } else if (volume_info->UNCip) {
1446 /* BB using ip addr as tcp_ses name to connect to the
1447 DFS root below */
1448 cERROR(1, ("Connecting to DFS root not implemented yet"));
1449 rc = -EINVAL;
1450 goto out_err;
1451 } else /* which tcp_sess DFS root would we conect to */ {
1452 cERROR(1,
1453 ("CIFS mount error: No UNC path (e.g. -o "
1454 "unc=//192.168.1.100/public) specified"));
1455 rc = -EINVAL;
1456 goto out_err;
1457 }
1458
1459 /* see if we already have a matching tcp_ses */
1460 tcp_ses = cifs_find_tcp_session(&addr);
1461 if (tcp_ses)
1462 return tcp_ses;
1463
1464 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1465 if (!tcp_ses) {
1466 rc = -ENOMEM;
1467 goto out_err;
1468 }
1469
1470 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1471 if (IS_ERR(tcp_ses->hostname)) {
1472 rc = PTR_ERR(tcp_ses->hostname);
1473 goto out_err;
1474 }
1475
1476 tcp_ses->noblocksnd = volume_info->noblocksnd;
1477 tcp_ses->noautotune = volume_info->noautotune;
1478 atomic_set(&tcp_ses->inFlight, 0);
1479 init_waitqueue_head(&tcp_ses->response_q);
1480 init_waitqueue_head(&tcp_ses->request_q);
1481 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1482 mutex_init(&tcp_ses->srv_mutex);
1483 memcpy(tcp_ses->workstation_RFC1001_name,
1484 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1485 memcpy(tcp_ses->server_RFC1001_name,
1486 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1487 tcp_ses->sequence_number = 0;
1488 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1489 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1490
1491 /*
1492 * at this point we are the only ones with the pointer
1493 * to the struct since the kernel thread not created yet
1494 * no need to spinlock this init of tcpStatus or srv_count
1495 */
1496 tcp_ses->tcpStatus = CifsNew;
1497 ++tcp_ses->srv_count;
1498
1499 if (addr.ss_family == AF_INET6) {
1500 cFYI(1, ("attempting ipv6 connect"));
1501 /* BB should we allow ipv6 on port 139? */
1502 /* other OS never observed in Wild doing 139 with v6 */
1503 sin_server6->sin6_port = htons(volume_info->port);
1504 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1505 sizeof(struct sockaddr_in6));
1506 rc = ipv6_connect(tcp_ses);
1507 } else {
1508 sin_server->sin_port = htons(volume_info->port);
1509 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1510 sizeof(struct sockaddr_in));
1511 rc = ipv4_connect(tcp_ses);
1512 }
1513 if (rc < 0) {
1514 cERROR(1, ("Error connecting to socket. Aborting operation"));
1515 goto out_err;
1516 }
1517
1518 /*
1519 * since we're in a cifs function already, we know that
1520 * this will succeed. No need for try_module_get().
1521 */
1522 __module_get(THIS_MODULE);
1523 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1524 tcp_ses, "cifsd");
1525 if (IS_ERR(tcp_ses->tsk)) {
1526 rc = PTR_ERR(tcp_ses->tsk);
1527 cERROR(1, ("error %d create cifsd thread", rc));
1528 module_put(THIS_MODULE);
1529 goto out_err;
1530 }
1531
1532 /* thread spawned, put it on the list */
1533 write_lock(&cifs_tcp_ses_lock);
1534 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1535 write_unlock(&cifs_tcp_ses_lock);
1536
1537 return tcp_ses;
1538
1539 out_err:
1540 if (tcp_ses) {
1541 kfree(tcp_ses->hostname);
1542 if (tcp_ses->ssocket)
1543 sock_release(tcp_ses->ssocket);
1544 kfree(tcp_ses);
1545 }
1546 return ERR_PTR(rc);
1547 }
1548
1549 static struct cifsSesInfo *
1550 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1551 {
1552 struct list_head *tmp;
1553 struct cifsSesInfo *ses;
1554
1555 write_lock(&cifs_tcp_ses_lock);
1556 list_for_each(tmp, &server->smb_ses_list) {
1557 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1558 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1559 continue;
1560
1561 ++ses->ses_count;
1562 write_unlock(&cifs_tcp_ses_lock);
1563 return ses;
1564 }
1565 write_unlock(&cifs_tcp_ses_lock);
1566 return NULL;
1567 }
1568
1569 static void
1570 cifs_put_smb_ses(struct cifsSesInfo *ses)
1571 {
1572 int xid;
1573 struct TCP_Server_Info *server = ses->server;
1574
1575 write_lock(&cifs_tcp_ses_lock);
1576 if (--ses->ses_count > 0) {
1577 write_unlock(&cifs_tcp_ses_lock);
1578 return;
1579 }
1580
1581 list_del_init(&ses->smb_ses_list);
1582 write_unlock(&cifs_tcp_ses_lock);
1583
1584 if (ses->status == CifsGood) {
1585 xid = GetXid();
1586 CIFSSMBLogoff(xid, ses);
1587 _FreeXid(xid);
1588 }
1589 sesInfoFree(ses);
1590 cifs_put_tcp_session(server);
1591 }
1592
1593 static struct cifsTconInfo *
1594 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1595 {
1596 struct list_head *tmp;
1597 struct cifsTconInfo *tcon;
1598
1599 write_lock(&cifs_tcp_ses_lock);
1600 list_for_each(tmp, &ses->tcon_list) {
1601 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1602 if (tcon->tidStatus == CifsExiting)
1603 continue;
1604 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1605 continue;
1606
1607 ++tcon->tc_count;
1608 write_unlock(&cifs_tcp_ses_lock);
1609 return tcon;
1610 }
1611 write_unlock(&cifs_tcp_ses_lock);
1612 return NULL;
1613 }
1614
1615 static void
1616 cifs_put_tcon(struct cifsTconInfo *tcon)
1617 {
1618 int xid;
1619 struct cifsSesInfo *ses = tcon->ses;
1620
1621 write_lock(&cifs_tcp_ses_lock);
1622 if (--tcon->tc_count > 0) {
1623 write_unlock(&cifs_tcp_ses_lock);
1624 return;
1625 }
1626
1627 list_del_init(&tcon->tcon_list);
1628 write_unlock(&cifs_tcp_ses_lock);
1629
1630 xid = GetXid();
1631 CIFSSMBTDis(xid, tcon);
1632 _FreeXid(xid);
1633
1634 DeleteTconOplockQEntries(tcon);
1635 tconInfoFree(tcon);
1636 cifs_put_smb_ses(ses);
1637 }
1638
1639 int
1640 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1641 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1642 struct dfs_info3_param **preferrals, int remap)
1643 {
1644 char *temp_unc;
1645 int rc = 0;
1646
1647 *pnum_referrals = 0;
1648 *preferrals = NULL;
1649
1650 if (pSesInfo->ipc_tid == 0) {
1651 temp_unc = kmalloc(2 /* for slashes */ +
1652 strnlen(pSesInfo->serverName,
1653 SERVER_NAME_LEN_WITH_NULL * 2)
1654 + 1 + 4 /* slash IPC$ */ + 2,
1655 GFP_KERNEL);
1656 if (temp_unc == NULL)
1657 return -ENOMEM;
1658 temp_unc[0] = '\\';
1659 temp_unc[1] = '\\';
1660 strcpy(temp_unc + 2, pSesInfo->serverName);
1661 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1662 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1663 cFYI(1,
1664 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1665 kfree(temp_unc);
1666 }
1667 if (rc == 0)
1668 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1669 pnum_referrals, nls_codepage, remap);
1670 /* BB map targetUNCs to dfs_info3 structures, here or
1671 in CIFSGetDFSRefer BB */
1672
1673 return rc;
1674 }
1675
1676 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1677 static struct lock_class_key cifs_key[2];
1678 static struct lock_class_key cifs_slock_key[2];
1679
1680 static inline void
1681 cifs_reclassify_socket4(struct socket *sock)
1682 {
1683 struct sock *sk = sock->sk;
1684 BUG_ON(sock_owned_by_user(sk));
1685 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1686 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1687 }
1688
1689 static inline void
1690 cifs_reclassify_socket6(struct socket *sock)
1691 {
1692 struct sock *sk = sock->sk;
1693 BUG_ON(sock_owned_by_user(sk));
1694 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1695 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1696 }
1697 #else
1698 static inline void
1699 cifs_reclassify_socket4(struct socket *sock)
1700 {
1701 }
1702
1703 static inline void
1704 cifs_reclassify_socket6(struct socket *sock)
1705 {
1706 }
1707 #endif
1708
1709 /* See RFC1001 section 14 on representation of Netbios names */
1710 static void rfc1002mangle(char *target, char *source, unsigned int length)
1711 {
1712 unsigned int i, j;
1713
1714 for (i = 0, j = 0; i < (length); i++) {
1715 /* mask a nibble at a time and encode */
1716 target[j] = 'A' + (0x0F & (source[i] >> 4));
1717 target[j+1] = 'A' + (0x0F & source[i]);
1718 j += 2;
1719 }
1720
1721 }
1722
1723
1724 static int
1725 ipv4_connect(struct TCP_Server_Info *server)
1726 {
1727 int rc = 0;
1728 bool connected = false;
1729 __be16 orig_port = 0;
1730 struct socket *socket = server->ssocket;
1731
1732 if (socket == NULL) {
1733 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1734 IPPROTO_TCP, &socket);
1735 if (rc < 0) {
1736 cERROR(1, ("Error %d creating socket", rc));
1737 return rc;
1738 }
1739
1740 /* BB other socket options to set KEEPALIVE, NODELAY? */
1741 cFYI(1, ("Socket created"));
1742 server->ssocket = socket;
1743 socket->sk->sk_allocation = GFP_NOFS;
1744 cifs_reclassify_socket4(socket);
1745 }
1746
1747 /* user overrode default port */
1748 if (server->addr.sockAddr.sin_port) {
1749 rc = socket->ops->connect(socket, (struct sockaddr *)
1750 &server->addr.sockAddr,
1751 sizeof(struct sockaddr_in), 0);
1752 if (rc >= 0)
1753 connected = true;
1754 }
1755
1756 if (!connected) {
1757 /* save original port so we can retry user specified port
1758 later if fall back ports fail this time */
1759 orig_port = server->addr.sockAddr.sin_port;
1760
1761 /* do not retry on the same port we just failed on */
1762 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1763 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1764 rc = socket->ops->connect(socket,
1765 (struct sockaddr *)
1766 &server->addr.sockAddr,
1767 sizeof(struct sockaddr_in), 0);
1768 if (rc >= 0)
1769 connected = true;
1770 }
1771 }
1772 if (!connected) {
1773 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1774 rc = socket->ops->connect(socket, (struct sockaddr *)
1775 &server->addr.sockAddr,
1776 sizeof(struct sockaddr_in), 0);
1777 if (rc >= 0)
1778 connected = true;
1779 }
1780
1781 /* give up here - unless we want to retry on different
1782 protocol families some day */
1783 if (!connected) {
1784 if (orig_port)
1785 server->addr.sockAddr.sin_port = orig_port;
1786 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1787 sock_release(socket);
1788 server->ssocket = NULL;
1789 return rc;
1790 }
1791
1792
1793 /*
1794 * Eventually check for other socket options to change from
1795 * the default. sock_setsockopt not used because it expects
1796 * user space buffer
1797 */
1798 socket->sk->sk_rcvtimeo = 7 * HZ;
1799 socket->sk->sk_sndtimeo = 5 * HZ;
1800
1801 /* make the bufsizes depend on wsize/rsize and max requests */
1802 if (server->noautotune) {
1803 if (socket->sk->sk_sndbuf < (200 * 1024))
1804 socket->sk->sk_sndbuf = 200 * 1024;
1805 if (socket->sk->sk_rcvbuf < (140 * 1024))
1806 socket->sk->sk_rcvbuf = 140 * 1024;
1807 }
1808
1809 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1810 socket->sk->sk_sndbuf,
1811 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1812
1813 /* send RFC1001 sessinit */
1814 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1815 /* some servers require RFC1001 sessinit before sending
1816 negprot - BB check reconnection in case where second
1817 sessinit is sent but no second negprot */
1818 struct rfc1002_session_packet *ses_init_buf;
1819 struct smb_hdr *smb_buf;
1820 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1821 GFP_KERNEL);
1822 if (ses_init_buf) {
1823 ses_init_buf->trailer.session_req.called_len = 32;
1824 if (server->server_RFC1001_name &&
1825 server->server_RFC1001_name[0] != 0)
1826 rfc1002mangle(ses_init_buf->trailer.
1827 session_req.called_name,
1828 server->server_RFC1001_name,
1829 RFC1001_NAME_LEN_WITH_NULL);
1830 else
1831 rfc1002mangle(ses_init_buf->trailer.
1832 session_req.called_name,
1833 DEFAULT_CIFS_CALLED_NAME,
1834 RFC1001_NAME_LEN_WITH_NULL);
1835
1836 ses_init_buf->trailer.session_req.calling_len = 32;
1837
1838 /* calling name ends in null (byte 16) from old smb
1839 convention. */
1840 if (server->workstation_RFC1001_name &&
1841 server->workstation_RFC1001_name[0] != 0)
1842 rfc1002mangle(ses_init_buf->trailer.
1843 session_req.calling_name,
1844 server->workstation_RFC1001_name,
1845 RFC1001_NAME_LEN_WITH_NULL);
1846 else
1847 rfc1002mangle(ses_init_buf->trailer.
1848 session_req.calling_name,
1849 "LINUX_CIFS_CLNT",
1850 RFC1001_NAME_LEN_WITH_NULL);
1851
1852 ses_init_buf->trailer.session_req.scope1 = 0;
1853 ses_init_buf->trailer.session_req.scope2 = 0;
1854 smb_buf = (struct smb_hdr *)ses_init_buf;
1855 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1856 smb_buf->smb_buf_length = 0x81000044;
1857 rc = smb_send(server, smb_buf, 0x44);
1858 kfree(ses_init_buf);
1859 msleep(1); /* RFC1001 layer in at least one server
1860 requires very short break before negprot
1861 presumably because not expecting negprot
1862 to follow so fast. This is a simple
1863 solution that works without
1864 complicating the code and causes no
1865 significant slowing down on mount
1866 for everyone else */
1867 }
1868 /* else the negprot may still work without this
1869 even though malloc failed */
1870
1871 }
1872
1873 return rc;
1874 }
1875
1876 static int
1877 ipv6_connect(struct TCP_Server_Info *server)
1878 {
1879 int rc = 0;
1880 bool connected = false;
1881 __be16 orig_port = 0;
1882 struct socket *socket = server->ssocket;
1883
1884 if (socket == NULL) {
1885 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1886 IPPROTO_TCP, &socket);
1887 if (rc < 0) {
1888 cERROR(1, ("Error %d creating ipv6 socket", rc));
1889 socket = NULL;
1890 return rc;
1891 }
1892
1893 /* BB other socket options to set KEEPALIVE, NODELAY? */
1894 cFYI(1, ("ipv6 Socket created"));
1895 server->ssocket = socket;
1896 socket->sk->sk_allocation = GFP_NOFS;
1897 cifs_reclassify_socket6(socket);
1898 }
1899
1900 /* user overrode default port */
1901 if (server->addr.sockAddr6.sin6_port) {
1902 rc = socket->ops->connect(socket,
1903 (struct sockaddr *) &server->addr.sockAddr6,
1904 sizeof(struct sockaddr_in6), 0);
1905 if (rc >= 0)
1906 connected = true;
1907 }
1908
1909 if (!connected) {
1910 /* save original port so we can retry user specified port
1911 later if fall back ports fail this time */
1912
1913 orig_port = server->addr.sockAddr6.sin6_port;
1914 /* do not retry on the same port we just failed on */
1915 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1916 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1917 rc = socket->ops->connect(socket, (struct sockaddr *)
1918 &server->addr.sockAddr6,
1919 sizeof(struct sockaddr_in6), 0);
1920 if (rc >= 0)
1921 connected = true;
1922 }
1923 }
1924 if (!connected) {
1925 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1926 rc = socket->ops->connect(socket, (struct sockaddr *)
1927 &server->addr.sockAddr6,
1928 sizeof(struct sockaddr_in6), 0);
1929 if (rc >= 0)
1930 connected = true;
1931 }
1932
1933 /* give up here - unless we want to retry on different
1934 protocol families some day */
1935 if (!connected) {
1936 if (orig_port)
1937 server->addr.sockAddr6.sin6_port = orig_port;
1938 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1939 sock_release(socket);
1940 server->ssocket = NULL;
1941 return rc;
1942 }
1943
1944 /*
1945 * Eventually check for other socket options to change from
1946 * the default. sock_setsockopt not used because it expects
1947 * user space buffer
1948 */
1949 socket->sk->sk_rcvtimeo = 7 * HZ;
1950 socket->sk->sk_sndtimeo = 5 * HZ;
1951 server->ssocket = socket;
1952
1953 return rc;
1954 }
1955
1956 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1957 struct super_block *sb, struct smb_vol *vol_info)
1958 {
1959 /* if we are reconnecting then should we check to see if
1960 * any requested capabilities changed locally e.g. via
1961 * remount but we can not do much about it here
1962 * if they have (even if we could detect it by the following)
1963 * Perhaps we could add a backpointer to array of sb from tcon
1964 * or if we change to make all sb to same share the same
1965 * sb as NFS - then we only have one backpointer to sb.
1966 * What if we wanted to mount the server share twice once with
1967 * and once without posixacls or posix paths? */
1968 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1969
1970 if (vol_info && vol_info->no_linux_ext) {
1971 tcon->fsUnixInfo.Capability = 0;
1972 tcon->unix_ext = 0; /* Unix Extensions disabled */
1973 cFYI(1, ("Linux protocol extensions disabled"));
1974 return;
1975 } else if (vol_info)
1976 tcon->unix_ext = 1; /* Unix Extensions supported */
1977
1978 if (tcon->unix_ext == 0) {
1979 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1980 return;
1981 }
1982
1983 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1984 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1985
1986 /* check for reconnect case in which we do not
1987 want to change the mount behavior if we can avoid it */
1988 if (vol_info == NULL) {
1989 /* turn off POSIX ACL and PATHNAMES if not set
1990 originally at mount time */
1991 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1992 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1993 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1994 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1995 cERROR(1, ("POSIXPATH support change"));
1996 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1997 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1998 cERROR(1, ("possible reconnect error"));
1999 cERROR(1,
2000 ("server disabled POSIX path support"));
2001 }
2002 }
2003
2004 cap &= CIFS_UNIX_CAP_MASK;
2005 if (vol_info && vol_info->no_psx_acl)
2006 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2007 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2008 cFYI(1, ("negotiated posix acl support"));
2009 if (sb)
2010 sb->s_flags |= MS_POSIXACL;
2011 }
2012
2013 if (vol_info && vol_info->posix_paths == 0)
2014 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2015 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2016 cFYI(1, ("negotiate posix pathnames"));
2017 if (sb)
2018 CIFS_SB(sb)->mnt_cifs_flags |=
2019 CIFS_MOUNT_POSIX_PATHS;
2020 }
2021
2022 /* We might be setting the path sep back to a different
2023 form if we are reconnecting and the server switched its
2024 posix path capability for this share */
2025 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2026 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2027
2028 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2029 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2030 CIFS_SB(sb)->rsize = 127 * 1024;
2031 cFYI(DBG2,
2032 ("larger reads not supported by srv"));
2033 }
2034 }
2035
2036
2037 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2038 #ifdef CONFIG_CIFS_DEBUG2
2039 if (cap & CIFS_UNIX_FCNTL_CAP)
2040 cFYI(1, ("FCNTL cap"));
2041 if (cap & CIFS_UNIX_EXTATTR_CAP)
2042 cFYI(1, ("EXTATTR cap"));
2043 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2044 cFYI(1, ("POSIX path cap"));
2045 if (cap & CIFS_UNIX_XATTR_CAP)
2046 cFYI(1, ("XATTR cap"));
2047 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2048 cFYI(1, ("POSIX ACL cap"));
2049 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2050 cFYI(1, ("very large read cap"));
2051 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2052 cFYI(1, ("very large write cap"));
2053 #endif /* CIFS_DEBUG2 */
2054 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2055 if (vol_info == NULL) {
2056 cFYI(1, ("resetting capabilities failed"));
2057 } else
2058 cERROR(1, ("Negotiating Unix capabilities "
2059 "with the server failed. Consider "
2060 "mounting with the Unix Extensions\n"
2061 "disabled, if problems are found, "
2062 "by specifying the nounix mount "
2063 "option."));
2064
2065 }
2066 }
2067 }
2068
2069 static void
2070 convert_delimiter(char *path, char delim)
2071 {
2072 int i;
2073 char old_delim;
2074
2075 if (path == NULL)
2076 return;
2077
2078 if (delim == '/')
2079 old_delim = '\\';
2080 else
2081 old_delim = '/';
2082
2083 for (i = 0; path[i] != '\0'; i++) {
2084 if (path[i] == old_delim)
2085 path[i] = delim;
2086 }
2087 }
2088
2089 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2090 struct cifs_sb_info *cifs_sb)
2091 {
2092 if (pvolume_info->rsize > CIFSMaxBufSize) {
2093 cERROR(1, ("rsize %d too large, using MaxBufSize",
2094 pvolume_info->rsize));
2095 cifs_sb->rsize = CIFSMaxBufSize;
2096 } else if ((pvolume_info->rsize) &&
2097 (pvolume_info->rsize <= CIFSMaxBufSize))
2098 cifs_sb->rsize = pvolume_info->rsize;
2099 else /* default */
2100 cifs_sb->rsize = CIFSMaxBufSize;
2101
2102 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2103 cERROR(1, ("wsize %d too large, using 4096 instead",
2104 pvolume_info->wsize));
2105 cifs_sb->wsize = 4096;
2106 } else if (pvolume_info->wsize)
2107 cifs_sb->wsize = pvolume_info->wsize;
2108 else
2109 cifs_sb->wsize = min_t(const int,
2110 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2111 127*1024);
2112 /* old default of CIFSMaxBufSize was too small now
2113 that SMB Write2 can send multiple pages in kvec.
2114 RFC1001 does not describe what happens when frame
2115 bigger than 128K is sent so use that as max in
2116 conjunction with 52K kvec constraint on arch with 4K
2117 page size */
2118
2119 if (cifs_sb->rsize < 2048) {
2120 cifs_sb->rsize = 2048;
2121 /* Windows ME may prefer this */
2122 cFYI(1, ("readsize set to minimum: 2048"));
2123 }
2124 /* calculate prepath */
2125 cifs_sb->prepath = pvolume_info->prepath;
2126 if (cifs_sb->prepath) {
2127 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2128 /* we can not convert the / to \ in the path
2129 separators in the prefixpath yet because we do not
2130 know (until reset_cifs_unix_caps is called later)
2131 whether POSIX PATH CAP is available. We normalize
2132 the / to \ after reset_cifs_unix_caps is called */
2133 pvolume_info->prepath = NULL;
2134 } else
2135 cifs_sb->prepathlen = 0;
2136 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2137 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2138 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2139 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2140 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2141 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2142
2143 if (pvolume_info->noperm)
2144 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2145 if (pvolume_info->setuids)
2146 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2147 if (pvolume_info->server_ino)
2148 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2149 if (pvolume_info->remap)
2150 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2151 if (pvolume_info->no_xattr)
2152 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2153 if (pvolume_info->sfu_emul)
2154 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2155 if (pvolume_info->nobrl)
2156 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2157 if (pvolume_info->nostrictsync)
2158 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2159 if (pvolume_info->mand_lock)
2160 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2161 if (pvolume_info->cifs_acl)
2162 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2163 if (pvolume_info->override_uid)
2164 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2165 if (pvolume_info->override_gid)
2166 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2167 if (pvolume_info->dynperm)
2168 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2169 if (pvolume_info->direct_io) {
2170 cFYI(1, ("mounting share using direct i/o"));
2171 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2172 }
2173
2174 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2175 cERROR(1, ("mount option dynperm ignored if cifsacl "
2176 "mount option supported"));
2177 }
2178
2179 static int
2180 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2181 struct cifs_sb_info *cifs_sb, const char *full_path)
2182 {
2183 int rc;
2184 __u64 inode_num;
2185 FILE_ALL_INFO *pfile_info;
2186
2187 rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2188 cifs_sb->local_nls,
2189 cifs_sb->mnt_cifs_flags &
2190 CIFS_MOUNT_MAP_SPECIAL_CHR);
2191 if (rc != -EOPNOTSUPP)
2192 return rc;
2193
2194 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2195 if (pfile_info == NULL)
2196 return -ENOMEM;
2197
2198 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2199 0 /* not legacy */, cifs_sb->local_nls,
2200 cifs_sb->mnt_cifs_flags &
2201 CIFS_MOUNT_MAP_SPECIAL_CHR);
2202 kfree(pfile_info);
2203 return rc;
2204 }
2205
2206 static void
2207 cleanup_volume_info(struct smb_vol **pvolume_info)
2208 {
2209 struct smb_vol *volume_info;
2210
2211 if (!pvolume_info && !*pvolume_info)
2212 return;
2213
2214 volume_info = *pvolume_info;
2215 kzfree(volume_info->password);
2216 kfree(volume_info->UNC);
2217 kfree(volume_info->prepath);
2218 kfree(volume_info);
2219 *pvolume_info = NULL;
2220 return;
2221 }
2222
2223 #ifdef CONFIG_CIFS_DFS_UPCALL
2224 /* build_path_to_root returns full path to root when
2225 * we do not have an exiting connection (tcon) */
2226 static char *
2227 build_unc_path_to_root(const struct smb_vol *volume_info,
2228 const struct cifs_sb_info *cifs_sb)
2229 {
2230 char *full_path;
2231
2232 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2233 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2234 if (full_path == NULL)
2235 return ERR_PTR(-ENOMEM);
2236
2237 strncpy(full_path, volume_info->UNC, unc_len);
2238 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2239 int i;
2240 for (i = 0; i < unc_len; i++) {
2241 if (full_path[i] == '\\')
2242 full_path[i] = '/';
2243 }
2244 }
2245
2246 if (cifs_sb->prepathlen)
2247 strncpy(full_path + unc_len, cifs_sb->prepath,
2248 cifs_sb->prepathlen);
2249
2250 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2251 return full_path;
2252 }
2253 #endif
2254
2255 int
2256 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2257 char *mount_data_global, const char *devname)
2258 {
2259 int rc = 0;
2260 int xid;
2261 struct smb_vol *volume_info;
2262 struct cifsSesInfo *pSesInfo = NULL;
2263 struct cifsTconInfo *tcon = NULL;
2264 struct TCP_Server_Info *srvTcp = NULL;
2265 char *full_path;
2266 char *mount_data = mount_data_global;
2267 #ifdef CONFIG_CIFS_DFS_UPCALL
2268 struct dfs_info3_param *referrals = NULL;
2269 unsigned int num_referrals = 0;
2270 int referral_walks_count = 0;
2271 try_mount_again:
2272 #endif
2273 full_path = NULL;
2274
2275 xid = GetXid();
2276
2277 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2278 if (!volume_info) {
2279 rc = -ENOMEM;
2280 goto out;
2281 }
2282
2283 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2284 rc = -EINVAL;
2285 goto out;
2286 }
2287
2288 if (volume_info->nullauth) {
2289 cFYI(1, ("null user"));
2290 volume_info->username = "";
2291 } else if (volume_info->username) {
2292 /* BB fixme parse for domain name here */
2293 cFYI(1, ("Username: %s", volume_info->username));
2294 } else {
2295 cifserror("No username specified");
2296 /* In userspace mount helper we can get user name from alternate
2297 locations such as env variables and files on disk */
2298 rc = -EINVAL;
2299 goto out;
2300 }
2301
2302
2303 /* this is needed for ASCII cp to Unicode converts */
2304 if (volume_info->iocharset == NULL) {
2305 cifs_sb->local_nls = load_nls_default();
2306 /* load_nls_default can not return null */
2307 } else {
2308 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2309 if (cifs_sb->local_nls == NULL) {
2310 cERROR(1, ("CIFS mount error: iocharset %s not found",
2311 volume_info->iocharset));
2312 rc = -ELIBACC;
2313 goto out;
2314 }
2315 }
2316
2317 /* get a reference to a tcp session */
2318 srvTcp = cifs_get_tcp_session(volume_info);
2319 if (IS_ERR(srvTcp)) {
2320 rc = PTR_ERR(srvTcp);
2321 goto out;
2322 }
2323
2324 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2325 if (pSesInfo) {
2326 cFYI(1, ("Existing smb sess found (status=%d)",
2327 pSesInfo->status));
2328 /*
2329 * The existing SMB session already has a reference to srvTcp,
2330 * so we can put back the extra one we got before
2331 */
2332 cifs_put_tcp_session(srvTcp);
2333
2334 down(&pSesInfo->sesSem);
2335 if (pSesInfo->need_reconnect) {
2336 cFYI(1, ("Session needs reconnect"));
2337 rc = cifs_setup_session(xid, pSesInfo,
2338 cifs_sb->local_nls);
2339 }
2340 up(&pSesInfo->sesSem);
2341 } else if (!rc) {
2342 cFYI(1, ("Existing smb sess not found"));
2343 pSesInfo = sesInfoAlloc();
2344 if (pSesInfo == NULL) {
2345 rc = -ENOMEM;
2346 goto mount_fail_check;
2347 }
2348
2349 /* new SMB session uses our srvTcp ref */
2350 pSesInfo->server = srvTcp;
2351 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2352 sprintf(pSesInfo->serverName, "%pI6",
2353 &srvTcp->addr.sockAddr6.sin6_addr);
2354 else
2355 sprintf(pSesInfo->serverName, "%pI4",
2356 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2357
2358 write_lock(&cifs_tcp_ses_lock);
2359 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2360 write_unlock(&cifs_tcp_ses_lock);
2361
2362 /* volume_info->password freed at unmount */
2363 if (volume_info->password) {
2364 pSesInfo->password = kstrdup(volume_info->password,
2365 GFP_KERNEL);
2366 if (!pSesInfo->password) {
2367 rc = -ENOMEM;
2368 goto mount_fail_check;
2369 }
2370 }
2371 if (volume_info->username)
2372 strncpy(pSesInfo->userName, volume_info->username,
2373 MAX_USERNAME_SIZE);
2374 if (volume_info->domainname) {
2375 int len = strlen(volume_info->domainname);
2376 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2377 if (pSesInfo->domainName)
2378 strcpy(pSesInfo->domainName,
2379 volume_info->domainname);
2380 }
2381 pSesInfo->linux_uid = volume_info->linux_uid;
2382 pSesInfo->overrideSecFlg = volume_info->secFlg;
2383 down(&pSesInfo->sesSem);
2384
2385 /* BB FIXME need to pass vol->secFlgs BB */
2386 rc = cifs_setup_session(xid, pSesInfo,
2387 cifs_sb->local_nls);
2388 up(&pSesInfo->sesSem);
2389 }
2390
2391 /* search for existing tcon to this server share */
2392 if (!rc) {
2393 setup_cifs_sb(volume_info, cifs_sb);
2394
2395 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2396 if (tcon) {
2397 cFYI(1, ("Found match on UNC path"));
2398 /* existing tcon already has a reference */
2399 cifs_put_smb_ses(pSesInfo);
2400 if (tcon->seal != volume_info->seal)
2401 cERROR(1, ("transport encryption setting "
2402 "conflicts with existing tid"));
2403 } else {
2404 tcon = tconInfoAlloc();
2405 if (tcon == NULL) {
2406 rc = -ENOMEM;
2407 goto mount_fail_check;
2408 }
2409
2410 tcon->ses = pSesInfo;
2411 if (volume_info->password) {
2412 tcon->password = kstrdup(volume_info->password,
2413 GFP_KERNEL);
2414 if (!tcon->password) {
2415 rc = -ENOMEM;
2416 goto mount_fail_check;
2417 }
2418 }
2419
2420 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2421 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2422 cERROR(1, ("Missing share name"));
2423 rc = -ENODEV;
2424 goto mount_fail_check;
2425 } else {
2426 /* BB Do we need to wrap sesSem around
2427 * this TCon call and Unix SetFS as
2428 * we do on SessSetup and reconnect? */
2429 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2430 tcon, cifs_sb->local_nls);
2431 cFYI(1, ("CIFS Tcon rc = %d", rc));
2432 if (volume_info->nodfs) {
2433 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2434 cFYI(1, ("DFS disabled (%d)",
2435 tcon->Flags));
2436 }
2437 }
2438 if (rc)
2439 goto remote_path_check;
2440 tcon->seal = volume_info->seal;
2441 write_lock(&cifs_tcp_ses_lock);
2442 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2443 write_unlock(&cifs_tcp_ses_lock);
2444 }
2445
2446 /* we can have only one retry value for a connection
2447 to a share so for resources mounted more than once
2448 to the same server share the last value passed in
2449 for the retry flag is used */
2450 tcon->retry = volume_info->retry;
2451 tcon->nocase = volume_info->nocase;
2452 tcon->local_lease = volume_info->local_lease;
2453 }
2454 if (pSesInfo) {
2455 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2456 sb->s_maxbytes = MAX_LFS_FILESIZE;
2457 else
2458 sb->s_maxbytes = MAX_NON_LFS;
2459 }
2460
2461 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2462 sb->s_time_gran = 100;
2463
2464 if (rc)
2465 goto remote_path_check;
2466
2467 cifs_sb->tcon = tcon;
2468
2469 /* do not care if following two calls succeed - informational */
2470 if (!tcon->ipc) {
2471 CIFSSMBQFSDeviceInfo(xid, tcon);
2472 CIFSSMBQFSAttributeInfo(xid, tcon);
2473 }
2474
2475 /* tell server which Unix caps we support */
2476 if (tcon->ses->capabilities & CAP_UNIX)
2477 /* reset of caps checks mount to see if unix extensions
2478 disabled for just this mount */
2479 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2480 else
2481 tcon->unix_ext = 0; /* server does not support them */
2482
2483 /* convert forward to back slashes in prepath here if needed */
2484 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2485 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2486
2487 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2488 cifs_sb->rsize = 1024 * 127;
2489 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2490 }
2491 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2492 cifs_sb->wsize = min(cifs_sb->wsize,
2493 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2494 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2495 cifs_sb->rsize = min(cifs_sb->rsize,
2496 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2497
2498 remote_path_check:
2499 /* check if a whole path (including prepath) is not remote */
2500 if (!rc && cifs_sb->prepathlen && tcon) {
2501 /* build_path_to_root works only when we have a valid tcon */
2502 full_path = cifs_build_path_to_root(cifs_sb);
2503 if (full_path == NULL) {
2504 rc = -ENOMEM;
2505 goto mount_fail_check;
2506 }
2507 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2508 if (rc != -EREMOTE) {
2509 kfree(full_path);
2510 goto mount_fail_check;
2511 }
2512 kfree(full_path);
2513 }
2514
2515 /* get referral if needed */
2516 if (rc == -EREMOTE) {
2517 #ifdef CONFIG_CIFS_DFS_UPCALL
2518 if (referral_walks_count > MAX_NESTED_LINKS) {
2519 /*
2520 * BB: when we implement proper loop detection,
2521 * we will remove this check. But now we need it
2522 * to prevent an indefinite loop if 'DFS tree' is
2523 * misconfigured (i.e. has loops).
2524 */
2525 rc = -ELOOP;
2526 goto mount_fail_check;
2527 }
2528 /* convert forward to back slashes in prepath here if needed */
2529 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2530 convert_delimiter(cifs_sb->prepath,
2531 CIFS_DIR_SEP(cifs_sb));
2532 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2533 if (IS_ERR(full_path)) {
2534 rc = PTR_ERR(full_path);
2535 goto mount_fail_check;
2536 }
2537
2538 cFYI(1, ("Getting referral for: %s", full_path));
2539 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2540 cifs_sb->local_nls, &num_referrals, &referrals,
2541 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2542 if (!rc && num_referrals > 0) {
2543 char *fake_devname = NULL;
2544
2545 if (mount_data != mount_data_global)
2546 kfree(mount_data);
2547 mount_data = cifs_compose_mount_options(
2548 cifs_sb->mountdata, full_path + 1,
2549 referrals, &fake_devname);
2550 kfree(fake_devname);
2551 free_dfs_info_array(referrals, num_referrals);
2552
2553 if (tcon)
2554 cifs_put_tcon(tcon);
2555 else if (pSesInfo)
2556 cifs_put_smb_ses(pSesInfo);
2557
2558 cleanup_volume_info(&volume_info);
2559 FreeXid(xid);
2560 kfree(full_path);
2561 referral_walks_count++;
2562 goto try_mount_again;
2563 }
2564 #else /* No DFS support, return error on mount */
2565 rc = -EOPNOTSUPP;
2566 #endif
2567 }
2568
2569 mount_fail_check:
2570 /* on error free sesinfo and tcon struct if needed */
2571 if (rc) {
2572 if (mount_data != mount_data_global)
2573 kfree(mount_data);
2574 /* If find_unc succeeded then rc == 0 so we can not end */
2575 /* up accidently freeing someone elses tcon struct */
2576 if (tcon)
2577 cifs_put_tcon(tcon);
2578 else if (pSesInfo)
2579 cifs_put_smb_ses(pSesInfo);
2580 else
2581 cifs_put_tcp_session(srvTcp);
2582 goto out;
2583 }
2584
2585 /* volume_info->password is freed above when existing session found
2586 (in which case it is not needed anymore) but when new sesion is created
2587 the password ptr is put in the new session structure (in which case the
2588 password will be freed at unmount time) */
2589 out:
2590 /* zero out password before freeing */
2591 cleanup_volume_info(&volume_info);
2592 FreeXid(xid);
2593 return rc;
2594 }
2595
2596 int
2597 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2598 const char *tree, struct cifsTconInfo *tcon,
2599 const struct nls_table *nls_codepage)
2600 {
2601 struct smb_hdr *smb_buffer;
2602 struct smb_hdr *smb_buffer_response;
2603 TCONX_REQ *pSMB;
2604 TCONX_RSP *pSMBr;
2605 unsigned char *bcc_ptr;
2606 int rc = 0;
2607 int length, bytes_left;
2608 __u16 count;
2609
2610 if (ses == NULL)
2611 return -EIO;
2612
2613 smb_buffer = cifs_buf_get();
2614 if (smb_buffer == NULL) {
2615 return -ENOMEM;
2616 }
2617 smb_buffer_response = smb_buffer;
2618
2619 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2620 NULL /*no tid */ , 4 /*wct */ );
2621
2622 smb_buffer->Mid = GetNextMid(ses->server);
2623 smb_buffer->Uid = ses->Suid;
2624 pSMB = (TCONX_REQ *) smb_buffer;
2625 pSMBr = (TCONX_RSP *) smb_buffer_response;
2626
2627 pSMB->AndXCommand = 0xFF;
2628 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2629 bcc_ptr = &pSMB->Password[0];
2630 if ((ses->server->secMode) & SECMODE_USER) {
2631 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2632 *bcc_ptr = 0; /* password is null byte */
2633 bcc_ptr++; /* skip password */
2634 /* already aligned so no need to do it below */
2635 } else {
2636 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2637 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2638 specified as required (when that support is added to
2639 the vfs in the future) as only NTLM or the much
2640 weaker LANMAN (which we do not send by default) is accepted
2641 by Samba (not sure whether other servers allow
2642 NTLMv2 password here) */
2643 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2644 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2645 (ses->server->secType == LANMAN))
2646 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2647 ses->server->secMode &
2648 SECMODE_PW_ENCRYPT ? true : false,
2649 bcc_ptr);
2650 else
2651 #endif /* CIFS_WEAK_PW_HASH */
2652 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2653 bcc_ptr);
2654
2655 bcc_ptr += CIFS_SESS_KEY_SIZE;
2656 if (ses->capabilities & CAP_UNICODE) {
2657 /* must align unicode strings */
2658 *bcc_ptr = 0; /* null byte password */
2659 bcc_ptr++;
2660 }
2661 }
2662
2663 if (ses->server->secMode &
2664 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2665 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2666
2667 if (ses->capabilities & CAP_STATUS32) {
2668 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2669 }
2670 if (ses->capabilities & CAP_DFS) {
2671 smb_buffer->Flags2 |= SMBFLG2_DFS;
2672 }
2673 if (ses->capabilities & CAP_UNICODE) {
2674 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2675 length =
2676 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2677 6 /* max utf8 char length in bytes */ *
2678 (/* server len*/ + 256 /* share len */), nls_codepage);
2679 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2680 bcc_ptr += 2; /* skip trailing null */
2681 } else { /* ASCII */
2682 strcpy(bcc_ptr, tree);
2683 bcc_ptr += strlen(tree) + 1;
2684 }
2685 strcpy(bcc_ptr, "?????");
2686 bcc_ptr += strlen("?????");
2687 bcc_ptr += 1;
2688 count = bcc_ptr - &pSMB->Password[0];
2689 pSMB->hdr.smb_buf_length += count;
2690 pSMB->ByteCount = cpu_to_le16(count);
2691
2692 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2693 CIFS_STD_OP);
2694
2695 /* above now done in SendReceive */
2696 if ((rc == 0) && (tcon != NULL)) {
2697 bool is_unicode;
2698
2699 tcon->tidStatus = CifsGood;
2700 tcon->need_reconnect = false;
2701 tcon->tid = smb_buffer_response->Tid;
2702 bcc_ptr = pByteArea(smb_buffer_response);
2703 bytes_left = BCC(smb_buffer_response);
2704 length = strnlen(bcc_ptr, bytes_left - 2);
2705 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2706 is_unicode = true;
2707 else
2708 is_unicode = false;
2709
2710
2711 /* skip service field (NB: this field is always ASCII) */
2712 if (length == 3) {
2713 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2714 (bcc_ptr[2] == 'C')) {
2715 cFYI(1, ("IPC connection"));
2716 tcon->ipc = 1;
2717 }
2718 } else if (length == 2) {
2719 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2720 /* the most common case */
2721 cFYI(1, ("disk share connection"));
2722 }
2723 }
2724 bcc_ptr += length + 1;
2725 bytes_left -= (length + 1);
2726 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2727
2728 /* mostly informational -- no need to fail on error here */
2729 kfree(tcon->nativeFileSystem);
2730 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2731 bytes_left, is_unicode,
2732 nls_codepage);
2733
2734 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2735
2736 if ((smb_buffer_response->WordCount == 3) ||
2737 (smb_buffer_response->WordCount == 7))
2738 /* field is in same location */
2739 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2740 else
2741 tcon->Flags = 0;
2742 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2743 } else if ((rc == 0) && tcon == NULL) {
2744 /* all we need to save for IPC$ connection */
2745 ses->ipc_tid = smb_buffer_response->Tid;
2746 }
2747
2748 cifs_buf_release(smb_buffer);
2749 return rc;
2750 }
2751
2752 int
2753 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2754 {
2755 int rc = 0;
2756 char *tmp;
2757
2758 if (cifs_sb->tcon)
2759 cifs_put_tcon(cifs_sb->tcon);
2760
2761 cifs_sb->tcon = NULL;
2762 tmp = cifs_sb->prepath;
2763 cifs_sb->prepathlen = 0;
2764 cifs_sb->prepath = NULL;
2765 kfree(tmp);
2766
2767 return rc;
2768 }
2769
2770 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2771 struct nls_table *nls_info)
2772 {
2773 int rc = 0;
2774 int first_time = 0;
2775 struct TCP_Server_Info *server = pSesInfo->server;
2776
2777 /* what if server changes its buffer size after dropping the session? */
2778 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2779 rc = CIFSSMBNegotiate(xid, pSesInfo);
2780 if (rc == -EAGAIN) {
2781 /* retry only once on 1st time connection */
2782 rc = CIFSSMBNegotiate(xid, pSesInfo);
2783 if (rc == -EAGAIN)
2784 rc = -EHOSTDOWN;
2785 }
2786 if (rc == 0) {
2787 spin_lock(&GlobalMid_Lock);
2788 if (server->tcpStatus != CifsExiting)
2789 server->tcpStatus = CifsGood;
2790 else
2791 rc = -EHOSTDOWN;
2792 spin_unlock(&GlobalMid_Lock);
2793
2794 }
2795 first_time = 1;
2796 }
2797
2798 if (rc)
2799 goto ss_err_exit;
2800
2801 pSesInfo->flags = 0;
2802 pSesInfo->capabilities = server->capabilities;
2803 if (linuxExtEnabled == 0)
2804 pSesInfo->capabilities &= (~CAP_UNIX);
2805
2806 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2807 server->secMode, server->capabilities, server->timeAdj));
2808
2809 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2810 if (rc) {
2811 cERROR(1, ("Send error in SessSetup = %d", rc));
2812 } else {
2813 cFYI(1, ("CIFS Session Established successfully"));
2814 spin_lock(&GlobalMid_Lock);
2815 pSesInfo->status = CifsGood;
2816 pSesInfo->need_reconnect = false;
2817 spin_unlock(&GlobalMid_Lock);
2818 }
2819
2820 ss_err_exit:
2821 return rc;
2822 }
2823
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