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cifs: add "multiuser" mount option
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blobe65f72d1f23bc4532f387762388cacd254e999b9
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 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
56 unsigned char *p24);
57
58 extern mempool_t *cifs_req_poolp;
59
60 struct smb_vol {
61 char *username;
62 char *password;
63 char *domainname;
64 char *UNC;
65 char *UNCip;
66 char *iocharset; /* local code page for mapping to and from Unicode */
67 char source_rfc1001_name[16]; /* netbios name of client */
68 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
69 uid_t cred_uid;
70 uid_t linux_uid;
71 gid_t linux_gid;
72 mode_t file_mode;
73 mode_t dir_mode;
74 unsigned secFlg;
75 bool retry:1;
76 bool intr:1;
77 bool setuids:1;
78 bool override_uid:1;
79 bool override_gid:1;
80 bool dynperm:1;
81 bool noperm:1;
82 bool no_psx_acl:1; /* set if posix acl support should be disabled */
83 bool cifs_acl:1;
84 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
85 bool server_ino:1; /* use inode numbers from server ie UniqueId */
86 bool direct_io:1;
87 bool remap:1; /* set to remap seven reserved chars in filenames */
88 bool posix_paths:1; /* unset to not ask for posix pathnames. */
89 bool no_linux_ext:1;
90 bool sfu_emul:1;
91 bool nullauth:1; /* attempt to authenticate with null user */
92 bool nocase:1; /* request case insensitive filenames */
93 bool nobrl:1; /* disable sending byte range locks to srv */
94 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
95 bool seal:1; /* request transport encryption on share */
96 bool nodfs:1; /* Do not request DFS, even if available */
97 bool local_lease:1; /* check leases only on local system, not remote */
98 bool noblocksnd:1;
99 bool noautotune:1;
100 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
101 bool fsc:1; /* enable fscache */
102 bool mfsymlinks:1; /* use Minshall+French Symlinks */
103 bool multiuser:1;
104 unsigned int rsize;
105 unsigned int wsize;
106 bool sockopt_tcp_nodelay:1;
107 unsigned short int port;
108 char *prepath;
109 struct sockaddr_storage srcaddr; /* allow binding to a local IP */
110 struct nls_table *local_nls;
111 };
112
113 #define TLINK_ERROR_EXPIRE (1 * HZ)
114
115
116 static int ipv4_connect(struct TCP_Server_Info *server);
117 static int ipv6_connect(struct TCP_Server_Info *server);
118
119 /*
120 * cifs tcp session reconnection
121 *
122 * mark tcp session as reconnecting so temporarily locked
123 * mark all smb sessions as reconnecting for tcp session
124 * reconnect tcp session
125 * wake up waiters on reconnection? - (not needed currently)
126 */
127 static int
128 cifs_reconnect(struct TCP_Server_Info *server)
129 {
130 int rc = 0;
131 struct list_head *tmp, *tmp2;
132 struct cifsSesInfo *ses;
133 struct cifsTconInfo *tcon;
134 struct mid_q_entry *mid_entry;
135
136 spin_lock(&GlobalMid_Lock);
137 if (server->tcpStatus == CifsExiting) {
138 /* the demux thread will exit normally
139 next time through the loop */
140 spin_unlock(&GlobalMid_Lock);
141 return rc;
142 } else
143 server->tcpStatus = CifsNeedReconnect;
144 spin_unlock(&GlobalMid_Lock);
145 server->maxBuf = 0;
146
147 cFYI(1, "Reconnecting tcp session");
148
149 /* before reconnecting the tcp session, mark the smb session (uid)
150 and the tid bad so they are not used until reconnected */
151 read_lock(&cifs_tcp_ses_lock);
152 list_for_each(tmp, &server->smb_ses_list) {
153 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
154 ses->need_reconnect = true;
155 ses->ipc_tid = 0;
156 list_for_each(tmp2, &ses->tcon_list) {
157 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
158 tcon->need_reconnect = true;
159 }
160 }
161 read_unlock(&cifs_tcp_ses_lock);
162 /* do not want to be sending data on a socket we are freeing */
163 mutex_lock(&server->srv_mutex);
164 if (server->ssocket) {
165 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
166 server->ssocket->flags);
167 kernel_sock_shutdown(server->ssocket, SHUT_WR);
168 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
169 server->ssocket->state,
170 server->ssocket->flags);
171 sock_release(server->ssocket);
172 server->ssocket = NULL;
173 }
174
175 spin_lock(&GlobalMid_Lock);
176 list_for_each(tmp, &server->pending_mid_q) {
177 mid_entry = list_entry(tmp, struct
178 mid_q_entry,
179 qhead);
180 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
181 /* Mark other intransit requests as needing
182 retry so we do not immediately mark the
183 session bad again (ie after we reconnect
184 below) as they timeout too */
185 mid_entry->midState = MID_RETRY_NEEDED;
186 }
187 }
188 spin_unlock(&GlobalMid_Lock);
189 mutex_unlock(&server->srv_mutex);
190
191 while ((server->tcpStatus != CifsExiting) &&
192 (server->tcpStatus != CifsGood)) {
193 try_to_freeze();
194 if (server->addr.sockAddr6.sin6_family == AF_INET6)
195 rc = ipv6_connect(server);
196 else
197 rc = ipv4_connect(server);
198 if (rc) {
199 cFYI(1, "reconnect error %d", rc);
200 msleep(3000);
201 } else {
202 atomic_inc(&tcpSesReconnectCount);
203 spin_lock(&GlobalMid_Lock);
204 if (server->tcpStatus != CifsExiting)
205 server->tcpStatus = CifsGood;
206 server->sequence_number = 0;
207 spin_unlock(&GlobalMid_Lock);
208 /* atomic_set(&server->inFlight,0);*/
209 wake_up(&server->response_q);
210 }
211 }
212 return rc;
213 }
214
215 /*
216 return codes:
217 0 not a transact2, or all data present
218 >0 transact2 with that much data missing
219 -EINVAL = invalid transact2
220
221 */
222 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
223 {
224 struct smb_t2_rsp *pSMBt;
225 int total_data_size;
226 int data_in_this_rsp;
227 int remaining;
228
229 if (pSMB->Command != SMB_COM_TRANSACTION2)
230 return 0;
231
232 /* check for plausible wct, bcc and t2 data and parm sizes */
233 /* check for parm and data offset going beyond end of smb */
234 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
235 cFYI(1, "invalid transact2 word count");
236 return -EINVAL;
237 }
238
239 pSMBt = (struct smb_t2_rsp *)pSMB;
240
241 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
242 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
243
244 remaining = total_data_size - data_in_this_rsp;
245
246 if (remaining == 0)
247 return 0;
248 else if (remaining < 0) {
249 cFYI(1, "total data %d smaller than data in frame %d",
250 total_data_size, data_in_this_rsp);
251 return -EINVAL;
252 } else {
253 cFYI(1, "missing %d bytes from transact2, check next response",
254 remaining);
255 if (total_data_size > maxBufSize) {
256 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
257 total_data_size, maxBufSize);
258 return -EINVAL;
259 }
260 return remaining;
261 }
262 }
263
264 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
265 {
266 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
267 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
268 int total_data_size;
269 int total_in_buf;
270 int remaining;
271 int total_in_buf2;
272 char *data_area_of_target;
273 char *data_area_of_buf2;
274 __u16 byte_count;
275
276 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
277
278 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
279 cFYI(1, "total data size of primary and secondary t2 differ");
280 }
281
282 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
283
284 remaining = total_data_size - total_in_buf;
285
286 if (remaining < 0)
287 return -EINVAL;
288
289 if (remaining == 0) /* nothing to do, ignore */
290 return 0;
291
292 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
293 if (remaining < total_in_buf2) {
294 cFYI(1, "transact2 2nd response contains too much data");
295 }
296
297 /* find end of first SMB data area */
298 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
299 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
300 /* validate target area */
301
302 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
303 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
304
305 data_area_of_target += total_in_buf;
306
307 /* copy second buffer into end of first buffer */
308 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
309 total_in_buf += total_in_buf2;
310 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
311 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
312 byte_count += total_in_buf2;
313 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
314
315 byte_count = pTargetSMB->smb_buf_length;
316 byte_count += total_in_buf2;
317
318 /* BB also add check that we are not beyond maximum buffer size */
319
320 pTargetSMB->smb_buf_length = byte_count;
321
322 if (remaining == total_in_buf2) {
323 cFYI(1, "found the last secondary response");
324 return 0; /* we are done */
325 } else /* more responses to go */
326 return 1;
327
328 }
329
330 static int
331 cifs_demultiplex_thread(struct TCP_Server_Info *server)
332 {
333 int length;
334 unsigned int pdu_length, total_read;
335 struct smb_hdr *smb_buffer = NULL;
336 struct smb_hdr *bigbuf = NULL;
337 struct smb_hdr *smallbuf = NULL;
338 struct msghdr smb_msg;
339 struct kvec iov;
340 struct socket *csocket = server->ssocket;
341 struct list_head *tmp;
342 struct cifsSesInfo *ses;
343 struct task_struct *task_to_wake = NULL;
344 struct mid_q_entry *mid_entry;
345 char temp;
346 bool isLargeBuf = false;
347 bool isMultiRsp;
348 int reconnect;
349
350 current->flags |= PF_MEMALLOC;
351 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
352
353 length = atomic_inc_return(&tcpSesAllocCount);
354 if (length > 1)
355 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
356 GFP_KERNEL);
357
358 set_freezable();
359 while (server->tcpStatus != CifsExiting) {
360 if (try_to_freeze())
361 continue;
362 if (bigbuf == NULL) {
363 bigbuf = cifs_buf_get();
364 if (!bigbuf) {
365 cERROR(1, "No memory for large SMB response");
366 msleep(3000);
367 /* retry will check if exiting */
368 continue;
369 }
370 } else if (isLargeBuf) {
371 /* we are reusing a dirty large buf, clear its start */
372 memset(bigbuf, 0, sizeof(struct smb_hdr));
373 }
374
375 if (smallbuf == NULL) {
376 smallbuf = cifs_small_buf_get();
377 if (!smallbuf) {
378 cERROR(1, "No memory for SMB response");
379 msleep(1000);
380 /* retry will check if exiting */
381 continue;
382 }
383 /* beginning of smb buffer is cleared in our buf_get */
384 } else /* if existing small buf clear beginning */
385 memset(smallbuf, 0, sizeof(struct smb_hdr));
386
387 isLargeBuf = false;
388 isMultiRsp = false;
389 smb_buffer = smallbuf;
390 iov.iov_base = smb_buffer;
391 iov.iov_len = 4;
392 smb_msg.msg_control = NULL;
393 smb_msg.msg_controllen = 0;
394 pdu_length = 4; /* enough to get RFC1001 header */
395 incomplete_rcv:
396 length =
397 kernel_recvmsg(csocket, &smb_msg,
398 &iov, 1, pdu_length, 0 /* BB other flags? */);
399
400 if (server->tcpStatus == CifsExiting) {
401 break;
402 } else if (server->tcpStatus == CifsNeedReconnect) {
403 cFYI(1, "Reconnect after server stopped responding");
404 cifs_reconnect(server);
405 cFYI(1, "call to reconnect done");
406 csocket = server->ssocket;
407 continue;
408 } else if (length == -ERESTARTSYS ||
409 length == -EAGAIN ||
410 length == -EINTR) {
411 msleep(1); /* minimum sleep to prevent looping
412 allowing socket to clear and app threads to set
413 tcpStatus CifsNeedReconnect if server hung */
414 if (pdu_length < 4) {
415 iov.iov_base = (4 - pdu_length) +
416 (char *)smb_buffer;
417 iov.iov_len = pdu_length;
418 smb_msg.msg_control = NULL;
419 smb_msg.msg_controllen = 0;
420 goto incomplete_rcv;
421 } else
422 continue;
423 } else if (length <= 0) {
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 /* give server a second to clean up */
465 msleep(1000);
466 /* always try 445 first on reconnect since we get NACK
467 * on some if we ever connected to port 139 (the NACK
468 * is since we do not begin with RFC1001 session
469 * initialize frame)
470 */
471 cifs_set_port((struct sockaddr *)
472 &server->addr.sockAddr, CIFS_PORT);
473 cifs_reconnect(server);
474 csocket = server->ssocket;
475 wake_up(&server->response_q);
476 continue;
477 } else if (temp != (char) 0) {
478 cERROR(1, "Unknown RFC 1002 frame");
479 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
480 length);
481 cifs_reconnect(server);
482 csocket = server->ssocket;
483 continue;
484 }
485
486 /* else we have an SMB response */
487 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
488 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
489 cERROR(1, "Invalid size SMB length %d pdu_length %d",
490 length, pdu_length+4);
491 cifs_reconnect(server);
492 csocket = server->ssocket;
493 wake_up(&server->response_q);
494 continue;
495 }
496
497 /* else length ok */
498 reconnect = 0;
499
500 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
501 isLargeBuf = true;
502 memcpy(bigbuf, smallbuf, 4);
503 smb_buffer = bigbuf;
504 }
505 length = 0;
506 iov.iov_base = 4 + (char *)smb_buffer;
507 iov.iov_len = pdu_length;
508 for (total_read = 0; total_read < pdu_length;
509 total_read += length) {
510 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
511 pdu_length - total_read, 0);
512 if (server->tcpStatus == CifsExiting) {
513 /* then will exit */
514 reconnect = 2;
515 break;
516 } else if (server->tcpStatus == CifsNeedReconnect) {
517 cifs_reconnect(server);
518 csocket = server->ssocket;
519 /* Reconnect wakes up rspns q */
520 /* Now we will reread sock */
521 reconnect = 1;
522 break;
523 } else if (length == -ERESTARTSYS ||
524 length == -EAGAIN ||
525 length == -EINTR) {
526 msleep(1); /* minimum sleep to prevent looping,
527 allowing socket to clear and app
528 threads to set tcpStatus
529 CifsNeedReconnect if server hung*/
530 length = 0;
531 continue;
532 } else if (length <= 0) {
533 cERROR(1, "Received no data, expecting %d",
534 pdu_length - total_read);
535 cifs_reconnect(server);
536 csocket = server->ssocket;
537 reconnect = 1;
538 break;
539 }
540 }
541 if (reconnect == 2)
542 break;
543 else if (reconnect == 1)
544 continue;
545
546 length += 4; /* account for rfc1002 hdr */
547
548
549 dump_smb(smb_buffer, length);
550 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
551 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
552 continue;
553 }
554
555
556 task_to_wake = NULL;
557 spin_lock(&GlobalMid_Lock);
558 list_for_each(tmp, &server->pending_mid_q) {
559 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
560
561 if ((mid_entry->mid == smb_buffer->Mid) &&
562 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
563 (mid_entry->command == smb_buffer->Command)) {
564 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
565 /* We have a multipart transact2 resp */
566 isMultiRsp = true;
567 if (mid_entry->resp_buf) {
568 /* merge response - fix up 1st*/
569 if (coalesce_t2(smb_buffer,
570 mid_entry->resp_buf)) {
571 mid_entry->multiRsp =
572 true;
573 break;
574 } else {
575 /* all parts received */
576 mid_entry->multiEnd =
577 true;
578 goto multi_t2_fnd;
579 }
580 } else {
581 if (!isLargeBuf) {
582 cERROR(1, "1st trans2 resp needs bigbuf");
583 /* BB maybe we can fix this up, switch
584 to already allocated large buffer? */
585 } else {
586 /* Have first buffer */
587 mid_entry->resp_buf =
588 smb_buffer;
589 mid_entry->largeBuf =
590 true;
591 bigbuf = NULL;
592 }
593 }
594 break;
595 }
596 mid_entry->resp_buf = smb_buffer;
597 mid_entry->largeBuf = isLargeBuf;
598 multi_t2_fnd:
599 task_to_wake = mid_entry->tsk;
600 mid_entry->midState = MID_RESPONSE_RECEIVED;
601 #ifdef CONFIG_CIFS_STATS2
602 mid_entry->when_received = jiffies;
603 #endif
604 /* so we do not time out requests to server
605 which is still responding (since server could
606 be busy but not dead) */
607 server->lstrp = jiffies;
608 break;
609 }
610 }
611 spin_unlock(&GlobalMid_Lock);
612 if (task_to_wake) {
613 /* Was previous buf put in mpx struct for multi-rsp? */
614 if (!isMultiRsp) {
615 /* smb buffer will be freed by user thread */
616 if (isLargeBuf)
617 bigbuf = NULL;
618 else
619 smallbuf = NULL;
620 }
621 wake_up_process(task_to_wake);
622 } else if (!is_valid_oplock_break(smb_buffer, server) &&
623 !isMultiRsp) {
624 cERROR(1, "No task to wake, unknown frame received! "
625 "NumMids %d", midCount.counter);
626 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
627 sizeof(struct smb_hdr));
628 #ifdef CONFIG_CIFS_DEBUG2
629 cifs_dump_detail(smb_buffer);
630 cifs_dump_mids(server);
631 #endif /* CIFS_DEBUG2 */
632
633 }
634 } /* end while !EXITING */
635
636 /* take it off the list, if it's not already */
637 write_lock(&cifs_tcp_ses_lock);
638 list_del_init(&server->tcp_ses_list);
639 write_unlock(&cifs_tcp_ses_lock);
640
641 spin_lock(&GlobalMid_Lock);
642 server->tcpStatus = CifsExiting;
643 spin_unlock(&GlobalMid_Lock);
644 wake_up_all(&server->response_q);
645
646 /* check if we have blocked requests that need to free */
647 /* Note that cifs_max_pending is normally 50, but
648 can be set at module install time to as little as two */
649 spin_lock(&GlobalMid_Lock);
650 if (atomic_read(&server->inFlight) >= cifs_max_pending)
651 atomic_set(&server->inFlight, cifs_max_pending - 1);
652 /* We do not want to set the max_pending too low or we
653 could end up with the counter going negative */
654 spin_unlock(&GlobalMid_Lock);
655 /* Although there should not be any requests blocked on
656 this queue it can not hurt to be paranoid and try to wake up requests
657 that may haven been blocked when more than 50 at time were on the wire
658 to the same server - they now will see the session is in exit state
659 and get out of SendReceive. */
660 wake_up_all(&server->request_q);
661 /* give those requests time to exit */
662 msleep(125);
663
664 if (server->ssocket) {
665 sock_release(csocket);
666 server->ssocket = NULL;
667 }
668 /* buffer usuallly freed in free_mid - need to free it here on exit */
669 cifs_buf_release(bigbuf);
670 if (smallbuf) /* no sense logging a debug message if NULL */
671 cifs_small_buf_release(smallbuf);
672
673 /*
674 * BB: we shouldn't have to do any of this. It shouldn't be
675 * possible to exit from the thread with active SMB sessions
676 */
677 read_lock(&cifs_tcp_ses_lock);
678 if (list_empty(&server->pending_mid_q)) {
679 /* loop through server session structures attached to this and
680 mark them dead */
681 list_for_each(tmp, &server->smb_ses_list) {
682 ses = list_entry(tmp, struct cifsSesInfo,
683 smb_ses_list);
684 ses->status = CifsExiting;
685 ses->server = NULL;
686 }
687 read_unlock(&cifs_tcp_ses_lock);
688 } else {
689 /* although we can not zero the server struct pointer yet,
690 since there are active requests which may depnd on them,
691 mark the corresponding SMB sessions as exiting too */
692 list_for_each(tmp, &server->smb_ses_list) {
693 ses = list_entry(tmp, struct cifsSesInfo,
694 smb_ses_list);
695 ses->status = CifsExiting;
696 }
697
698 spin_lock(&GlobalMid_Lock);
699 list_for_each(tmp, &server->pending_mid_q) {
700 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
701 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
702 cFYI(1, "Clearing Mid 0x%x - waking up ",
703 mid_entry->mid);
704 task_to_wake = mid_entry->tsk;
705 if (task_to_wake)
706 wake_up_process(task_to_wake);
707 }
708 }
709 spin_unlock(&GlobalMid_Lock);
710 read_unlock(&cifs_tcp_ses_lock);
711 /* 1/8th of sec is more than enough time for them to exit */
712 msleep(125);
713 }
714
715 if (!list_empty(&server->pending_mid_q)) {
716 /* mpx threads have not exited yet give them
717 at least the smb send timeout time for long ops */
718 /* due to delays on oplock break requests, we need
719 to wait at least 45 seconds before giving up
720 on a request getting a response and going ahead
721 and killing cifsd */
722 cFYI(1, "Wait for exit from demultiplex thread");
723 msleep(46000);
724 /* if threads still have not exited they are probably never
725 coming home not much else we can do but free the memory */
726 }
727
728 /* last chance to mark ses pointers invalid
729 if there are any pointing to this (e.g
730 if a crazy root user tried to kill cifsd
731 kernel thread explicitly this might happen) */
732 /* BB: This shouldn't be necessary, see above */
733 read_lock(&cifs_tcp_ses_lock);
734 list_for_each(tmp, &server->smb_ses_list) {
735 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
736 ses->server = NULL;
737 }
738 read_unlock(&cifs_tcp_ses_lock);
739
740 kfree(server->hostname);
741 task_to_wake = xchg(&server->tsk, NULL);
742 kfree(server);
743
744 length = atomic_dec_return(&tcpSesAllocCount);
745 if (length > 0)
746 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
747 GFP_KERNEL);
748
749 /* if server->tsk was NULL then wait for a signal before exiting */
750 if (!task_to_wake) {
751 set_current_state(TASK_INTERRUPTIBLE);
752 while (!signal_pending(current)) {
753 schedule();
754 set_current_state(TASK_INTERRUPTIBLE);
755 }
756 set_current_state(TASK_RUNNING);
757 }
758
759 module_put_and_exit(0);
760 }
761
762 /* extract the host portion of the UNC string */
763 static char *
764 extract_hostname(const char *unc)
765 {
766 const char *src;
767 char *dst, *delim;
768 unsigned int len;
769
770 /* skip double chars at beginning of string */
771 /* BB: check validity of these bytes? */
772 src = unc + 2;
773
774 /* delimiter between hostname and sharename is always '\\' now */
775 delim = strchr(src, '\\');
776 if (!delim)
777 return ERR_PTR(-EINVAL);
778
779 len = delim - src;
780 dst = kmalloc((len + 1), GFP_KERNEL);
781 if (dst == NULL)
782 return ERR_PTR(-ENOMEM);
783
784 memcpy(dst, src, len);
785 dst[len] = '\0';
786
787 return dst;
788 }
789
790 static int
791 cifs_parse_mount_options(char *options, const char *devname,
792 struct smb_vol *vol)
793 {
794 char *value;
795 char *data;
796 unsigned int temp_len, i, j;
797 char separator[2];
798 short int override_uid = -1;
799 short int override_gid = -1;
800 bool uid_specified = false;
801 bool gid_specified = false;
802
803 separator[0] = ',';
804 separator[1] = 0;
805
806 if (Local_System_Name[0] != 0)
807 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
808 else {
809 char *nodename = utsname()->nodename;
810 int n = strnlen(nodename, 15);
811 memset(vol->source_rfc1001_name, 0x20, 15);
812 for (i = 0; i < n; i++) {
813 /* does not have to be perfect mapping since field is
814 informational, only used for servers that do not support
815 port 445 and it can be overridden at mount time */
816 vol->source_rfc1001_name[i] = toupper(nodename[i]);
817 }
818 }
819 vol->source_rfc1001_name[15] = 0;
820 /* null target name indicates to use *SMBSERVR default called name
821 if we end up sending RFC1001 session initialize */
822 vol->target_rfc1001_name[0] = 0;
823 vol->cred_uid = current_uid();
824 vol->linux_uid = current_uid();
825 vol->linux_gid = current_gid();
826
827 /* default to only allowing write access to owner of the mount */
828 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
829
830 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
831 /* default is always to request posix paths. */
832 vol->posix_paths = 1;
833 /* default to using server inode numbers where available */
834 vol->server_ino = 1;
835
836 if (!options)
837 return 1;
838
839 if (strncmp(options, "sep=", 4) == 0) {
840 if (options[4] != 0) {
841 separator[0] = options[4];
842 options += 5;
843 } else {
844 cFYI(1, "Null separator not allowed");
845 }
846 }
847
848 while ((data = strsep(&options, separator)) != NULL) {
849 if (!*data)
850 continue;
851 if ((value = strchr(data, '=')) != NULL)
852 *value++ = '\0';
853
854 /* Have to parse this before we parse for "user" */
855 if (strnicmp(data, "user_xattr", 10) == 0) {
856 vol->no_xattr = 0;
857 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
858 vol->no_xattr = 1;
859 } else if (strnicmp(data, "user", 4) == 0) {
860 if (!value) {
861 printk(KERN_WARNING
862 "CIFS: invalid or missing username\n");
863 return 1; /* needs_arg; */
864 } else if (!*value) {
865 /* null user, ie anonymous, authentication */
866 vol->nullauth = 1;
867 }
868 if (strnlen(value, 200) < 200) {
869 vol->username = value;
870 } else {
871 printk(KERN_WARNING "CIFS: username too long\n");
872 return 1;
873 }
874 } else if (strnicmp(data, "pass", 4) == 0) {
875 if (!value) {
876 vol->password = NULL;
877 continue;
878 } else if (value[0] == 0) {
879 /* check if string begins with double comma
880 since that would mean the password really
881 does start with a comma, and would not
882 indicate an empty string */
883 if (value[1] != separator[0]) {
884 vol->password = NULL;
885 continue;
886 }
887 }
888 temp_len = strlen(value);
889 /* removed password length check, NTLM passwords
890 can be arbitrarily long */
891
892 /* if comma in password, the string will be
893 prematurely null terminated. Commas in password are
894 specified across the cifs mount interface by a double
895 comma ie ,, and a comma used as in other cases ie ','
896 as a parameter delimiter/separator is single and due
897 to the strsep above is temporarily zeroed. */
898
899 /* NB: password legally can have multiple commas and
900 the only illegal character in a password is null */
901
902 if ((value[temp_len] == 0) &&
903 (value[temp_len+1] == separator[0])) {
904 /* reinsert comma */
905 value[temp_len] = separator[0];
906 temp_len += 2; /* move after second comma */
907 while (value[temp_len] != 0) {
908 if (value[temp_len] == separator[0]) {
909 if (value[temp_len+1] ==
910 separator[0]) {
911 /* skip second comma */
912 temp_len++;
913 } else {
914 /* single comma indicating start
915 of next parm */
916 break;
917 }
918 }
919 temp_len++;
920 }
921 if (value[temp_len] == 0) {
922 options = NULL;
923 } else {
924 value[temp_len] = 0;
925 /* point option to start of next parm */
926 options = value + temp_len + 1;
927 }
928 /* go from value to value + temp_len condensing
929 double commas to singles. Note that this ends up
930 allocating a few bytes too many, which is ok */
931 vol->password = kzalloc(temp_len, GFP_KERNEL);
932 if (vol->password == NULL) {
933 printk(KERN_WARNING "CIFS: no memory "
934 "for password\n");
935 return 1;
936 }
937 for (i = 0, j = 0; i < temp_len; i++, j++) {
938 vol->password[j] = value[i];
939 if (value[i] == separator[0]
940 && value[i+1] == separator[0]) {
941 /* skip second comma */
942 i++;
943 }
944 }
945 vol->password[j] = 0;
946 } else {
947 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
948 if (vol->password == NULL) {
949 printk(KERN_WARNING "CIFS: no memory "
950 "for password\n");
951 return 1;
952 }
953 strcpy(vol->password, value);
954 }
955 } else if (!strnicmp(data, "ip", 2) ||
956 !strnicmp(data, "addr", 4)) {
957 if (!value || !*value) {
958 vol->UNCip = NULL;
959 } else if (strnlen(value, INET6_ADDRSTRLEN) <
960 INET6_ADDRSTRLEN) {
961 vol->UNCip = value;
962 } else {
963 printk(KERN_WARNING "CIFS: ip address "
964 "too long\n");
965 return 1;
966 }
967 } else if (strnicmp(data, "sec", 3) == 0) {
968 if (!value || !*value) {
969 cERROR(1, "no security value specified");
970 continue;
971 } else if (strnicmp(value, "krb5i", 5) == 0) {
972 vol->secFlg |= CIFSSEC_MAY_KRB5 |
973 CIFSSEC_MUST_SIGN;
974 } else if (strnicmp(value, "krb5p", 5) == 0) {
975 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
976 CIFSSEC_MAY_KRB5; */
977 cERROR(1, "Krb5 cifs privacy not supported");
978 return 1;
979 } else if (strnicmp(value, "krb5", 4) == 0) {
980 vol->secFlg |= CIFSSEC_MAY_KRB5;
981 #ifdef CONFIG_CIFS_EXPERIMENTAL
982 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
983 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
984 CIFSSEC_MUST_SIGN;
985 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
986 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
987 #endif
988 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
989 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
990 CIFSSEC_MUST_SIGN;
991 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
992 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
993 } else if (strnicmp(value, "ntlmi", 5) == 0) {
994 vol->secFlg |= CIFSSEC_MAY_NTLM |
995 CIFSSEC_MUST_SIGN;
996 } else if (strnicmp(value, "ntlm", 4) == 0) {
997 /* ntlm is default so can be turned off too */
998 vol->secFlg |= CIFSSEC_MAY_NTLM;
999 } else if (strnicmp(value, "nontlm", 6) == 0) {
1000 /* BB is there a better way to do this? */
1001 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1002 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1003 } else if (strnicmp(value, "lanman", 6) == 0) {
1004 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1005 #endif
1006 } else if (strnicmp(value, "none", 4) == 0) {
1007 vol->nullauth = 1;
1008 } else {
1009 cERROR(1, "bad security option: %s", value);
1010 return 1;
1011 }
1012 } else if ((strnicmp(data, "unc", 3) == 0)
1013 || (strnicmp(data, "target", 6) == 0)
1014 || (strnicmp(data, "path", 4) == 0)) {
1015 if (!value || !*value) {
1016 printk(KERN_WARNING "CIFS: invalid path to "
1017 "network resource\n");
1018 return 1; /* needs_arg; */
1019 }
1020 if ((temp_len = strnlen(value, 300)) < 300) {
1021 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1022 if (vol->UNC == NULL)
1023 return 1;
1024 strcpy(vol->UNC, value);
1025 if (strncmp(vol->UNC, "//", 2) == 0) {
1026 vol->UNC[0] = '\\';
1027 vol->UNC[1] = '\\';
1028 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1029 printk(KERN_WARNING
1030 "CIFS: UNC Path does not begin "
1031 "with // or \\\\ \n");
1032 return 1;
1033 }
1034 } else {
1035 printk(KERN_WARNING "CIFS: UNC name too long\n");
1036 return 1;
1037 }
1038 } else if ((strnicmp(data, "domain", 3) == 0)
1039 || (strnicmp(data, "workgroup", 5) == 0)) {
1040 if (!value || !*value) {
1041 printk(KERN_WARNING "CIFS: invalid domain name\n");
1042 return 1; /* needs_arg; */
1043 }
1044 /* BB are there cases in which a comma can be valid in
1045 a domain name and need special handling? */
1046 if (strnlen(value, 256) < 256) {
1047 vol->domainname = value;
1048 cFYI(1, "Domain name set");
1049 } else {
1050 printk(KERN_WARNING "CIFS: domain name too "
1051 "long\n");
1052 return 1;
1053 }
1054 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1055 vol->srcaddr.ss_family = AF_UNSPEC;
1056
1057 if (!value || !*value) {
1058 printk(KERN_WARNING "CIFS: srcaddr value"
1059 " not specified.\n");
1060 return 1; /* needs_arg; */
1061 }
1062 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1063 value, strlen(value));
1064 if (i < 0) {
1065 printk(KERN_WARNING "CIFS: Could not parse"
1066 " srcaddr: %s\n",
1067 value);
1068 return 1;
1069 }
1070 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1071 if (!value || !*value) {
1072 printk(KERN_WARNING
1073 "CIFS: invalid path prefix\n");
1074 return 1; /* needs_argument */
1075 }
1076 if ((temp_len = strnlen(value, 1024)) < 1024) {
1077 if (value[0] != '/')
1078 temp_len++; /* missing leading slash */
1079 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1080 if (vol->prepath == NULL)
1081 return 1;
1082 if (value[0] != '/') {
1083 vol->prepath[0] = '/';
1084 strcpy(vol->prepath+1, value);
1085 } else
1086 strcpy(vol->prepath, value);
1087 cFYI(1, "prefix path %s", vol->prepath);
1088 } else {
1089 printk(KERN_WARNING "CIFS: prefix too long\n");
1090 return 1;
1091 }
1092 } else if (strnicmp(data, "iocharset", 9) == 0) {
1093 if (!value || !*value) {
1094 printk(KERN_WARNING "CIFS: invalid iocharset "
1095 "specified\n");
1096 return 1; /* needs_arg; */
1097 }
1098 if (strnlen(value, 65) < 65) {
1099 if (strnicmp(value, "default", 7))
1100 vol->iocharset = value;
1101 /* if iocharset not set then load_nls_default
1102 is used by caller */
1103 cFYI(1, "iocharset set to %s", value);
1104 } else {
1105 printk(KERN_WARNING "CIFS: iocharset name "
1106 "too long.\n");
1107 return 1;
1108 }
1109 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1110 vol->linux_uid = simple_strtoul(value, &value, 0);
1111 uid_specified = true;
1112 } else if (!strnicmp(data, "forceuid", 8)) {
1113 override_uid = 1;
1114 } else if (!strnicmp(data, "noforceuid", 10)) {
1115 override_uid = 0;
1116 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1117 vol->linux_gid = simple_strtoul(value, &value, 0);
1118 gid_specified = true;
1119 } else if (!strnicmp(data, "forcegid", 8)) {
1120 override_gid = 1;
1121 } else if (!strnicmp(data, "noforcegid", 10)) {
1122 override_gid = 0;
1123 } else if (strnicmp(data, "file_mode", 4) == 0) {
1124 if (value && *value) {
1125 vol->file_mode =
1126 simple_strtoul(value, &value, 0);
1127 }
1128 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1129 if (value && *value) {
1130 vol->dir_mode =
1131 simple_strtoul(value, &value, 0);
1132 }
1133 } else if (strnicmp(data, "dirmode", 4) == 0) {
1134 if (value && *value) {
1135 vol->dir_mode =
1136 simple_strtoul(value, &value, 0);
1137 }
1138 } else if (strnicmp(data, "port", 4) == 0) {
1139 if (value && *value) {
1140 vol->port =
1141 simple_strtoul(value, &value, 0);
1142 }
1143 } else if (strnicmp(data, "rsize", 5) == 0) {
1144 if (value && *value) {
1145 vol->rsize =
1146 simple_strtoul(value, &value, 0);
1147 }
1148 } else if (strnicmp(data, "wsize", 5) == 0) {
1149 if (value && *value) {
1150 vol->wsize =
1151 simple_strtoul(value, &value, 0);
1152 }
1153 } else if (strnicmp(data, "sockopt", 5) == 0) {
1154 if (!value || !*value) {
1155 cERROR(1, "no socket option specified");
1156 continue;
1157 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1158 vol->sockopt_tcp_nodelay = 1;
1159 }
1160 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1161 if (!value || !*value || (*value == ' ')) {
1162 cFYI(1, "invalid (empty) netbiosname");
1163 } else {
1164 memset(vol->source_rfc1001_name, 0x20, 15);
1165 for (i = 0; i < 15; i++) {
1166 /* BB are there cases in which a comma can be
1167 valid in this workstation netbios name (and need
1168 special handling)? */
1169
1170 /* We do not uppercase netbiosname for user */
1171 if (value[i] == 0)
1172 break;
1173 else
1174 vol->source_rfc1001_name[i] =
1175 value[i];
1176 }
1177 /* The string has 16th byte zero still from
1178 set at top of the function */
1179 if ((i == 15) && (value[i] != 0))
1180 printk(KERN_WARNING "CIFS: netbiosname"
1181 " longer than 15 truncated.\n");
1182 }
1183 } else if (strnicmp(data, "servern", 7) == 0) {
1184 /* servernetbiosname specified override *SMBSERVER */
1185 if (!value || !*value || (*value == ' ')) {
1186 cFYI(1, "empty server netbiosname specified");
1187 } else {
1188 /* last byte, type, is 0x20 for servr type */
1189 memset(vol->target_rfc1001_name, 0x20, 16);
1190
1191 for (i = 0; i < 15; i++) {
1192 /* BB are there cases in which a comma can be
1193 valid in this workstation netbios name
1194 (and need special handling)? */
1195
1196 /* user or mount helper must uppercase
1197 the netbiosname */
1198 if (value[i] == 0)
1199 break;
1200 else
1201 vol->target_rfc1001_name[i] =
1202 value[i];
1203 }
1204 /* The string has 16th byte zero still from
1205 set at top of the function */
1206 if ((i == 15) && (value[i] != 0))
1207 printk(KERN_WARNING "CIFS: server net"
1208 "biosname longer than 15 truncated.\n");
1209 }
1210 } else if (strnicmp(data, "credentials", 4) == 0) {
1211 /* ignore */
1212 } else if (strnicmp(data, "version", 3) == 0) {
1213 /* ignore */
1214 } else if (strnicmp(data, "guest", 5) == 0) {
1215 /* ignore */
1216 } else if (strnicmp(data, "rw", 2) == 0) {
1217 /* ignore */
1218 } else if (strnicmp(data, "ro", 2) == 0) {
1219 /* ignore */
1220 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1221 vol->noblocksnd = 1;
1222 } else if (strnicmp(data, "noautotune", 10) == 0) {
1223 vol->noautotune = 1;
1224 } else if ((strnicmp(data, "suid", 4) == 0) ||
1225 (strnicmp(data, "nosuid", 6) == 0) ||
1226 (strnicmp(data, "exec", 4) == 0) ||
1227 (strnicmp(data, "noexec", 6) == 0) ||
1228 (strnicmp(data, "nodev", 5) == 0) ||
1229 (strnicmp(data, "noauto", 6) == 0) ||
1230 (strnicmp(data, "dev", 3) == 0)) {
1231 /* The mount tool or mount.cifs helper (if present)
1232 uses these opts to set flags, and the flags are read
1233 by the kernel vfs layer before we get here (ie
1234 before read super) so there is no point trying to
1235 parse these options again and set anything and it
1236 is ok to just ignore them */
1237 continue;
1238 } else if (strnicmp(data, "hard", 4) == 0) {
1239 vol->retry = 1;
1240 } else if (strnicmp(data, "soft", 4) == 0) {
1241 vol->retry = 0;
1242 } else if (strnicmp(data, "perm", 4) == 0) {
1243 vol->noperm = 0;
1244 } else if (strnicmp(data, "noperm", 6) == 0) {
1245 vol->noperm = 1;
1246 } else if (strnicmp(data, "mapchars", 8) == 0) {
1247 vol->remap = 1;
1248 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1249 vol->remap = 0;
1250 } else if (strnicmp(data, "sfu", 3) == 0) {
1251 vol->sfu_emul = 1;
1252 } else if (strnicmp(data, "nosfu", 5) == 0) {
1253 vol->sfu_emul = 0;
1254 } else if (strnicmp(data, "nodfs", 5) == 0) {
1255 vol->nodfs = 1;
1256 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1257 vol->posix_paths = 1;
1258 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1259 vol->posix_paths = 0;
1260 } else if (strnicmp(data, "nounix", 6) == 0) {
1261 vol->no_linux_ext = 1;
1262 } else if (strnicmp(data, "nolinux", 7) == 0) {
1263 vol->no_linux_ext = 1;
1264 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1265 (strnicmp(data, "ignorecase", 10) == 0)) {
1266 vol->nocase = 1;
1267 } else if (strnicmp(data, "mand", 4) == 0) {
1268 /* ignore */
1269 } else if (strnicmp(data, "nomand", 6) == 0) {
1270 /* ignore */
1271 } else if (strnicmp(data, "_netdev", 7) == 0) {
1272 /* ignore */
1273 } else if (strnicmp(data, "brl", 3) == 0) {
1274 vol->nobrl = 0;
1275 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1276 (strnicmp(data, "nolock", 6) == 0)) {
1277 vol->nobrl = 1;
1278 /* turn off mandatory locking in mode
1279 if remote locking is turned off since the
1280 local vfs will do advisory */
1281 if (vol->file_mode ==
1282 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1283 vol->file_mode = S_IALLUGO;
1284 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1285 /* will take the shorter form "forcemand" as well */
1286 /* This mount option will force use of mandatory
1287 (DOS/Windows style) byte range locks, instead of
1288 using posix advisory byte range locks, even if the
1289 Unix extensions are available and posix locks would
1290 be supported otherwise. If Unix extensions are not
1291 negotiated this has no effect since mandatory locks
1292 would be used (mandatory locks is all that those
1293 those servers support) */
1294 vol->mand_lock = 1;
1295 } else if (strnicmp(data, "setuids", 7) == 0) {
1296 vol->setuids = 1;
1297 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1298 vol->setuids = 0;
1299 } else if (strnicmp(data, "dynperm", 7) == 0) {
1300 vol->dynperm = true;
1301 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1302 vol->dynperm = false;
1303 } else if (strnicmp(data, "nohard", 6) == 0) {
1304 vol->retry = 0;
1305 } else if (strnicmp(data, "nosoft", 6) == 0) {
1306 vol->retry = 1;
1307 } else if (strnicmp(data, "nointr", 6) == 0) {
1308 vol->intr = 0;
1309 } else if (strnicmp(data, "intr", 4) == 0) {
1310 vol->intr = 1;
1311 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1312 vol->nostrictsync = 1;
1313 } else if (strnicmp(data, "strictsync", 10) == 0) {
1314 vol->nostrictsync = 0;
1315 } else if (strnicmp(data, "serverino", 7) == 0) {
1316 vol->server_ino = 1;
1317 } else if (strnicmp(data, "noserverino", 9) == 0) {
1318 vol->server_ino = 0;
1319 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1320 vol->cifs_acl = 1;
1321 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1322 vol->cifs_acl = 0;
1323 } else if (strnicmp(data, "acl", 3) == 0) {
1324 vol->no_psx_acl = 0;
1325 } else if (strnicmp(data, "noacl", 5) == 0) {
1326 vol->no_psx_acl = 1;
1327 #ifdef CONFIG_CIFS_EXPERIMENTAL
1328 } else if (strnicmp(data, "locallease", 6) == 0) {
1329 vol->local_lease = 1;
1330 #endif
1331 } else if (strnicmp(data, "sign", 4) == 0) {
1332 vol->secFlg |= CIFSSEC_MUST_SIGN;
1333 } else if (strnicmp(data, "seal", 4) == 0) {
1334 /* we do not do the following in secFlags because seal
1335 is a per tree connection (mount) not a per socket
1336 or per-smb connection option in the protocol */
1337 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1338 vol->seal = 1;
1339 } else if (strnicmp(data, "direct", 6) == 0) {
1340 vol->direct_io = 1;
1341 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1342 vol->direct_io = 1;
1343 } else if (strnicmp(data, "noac", 4) == 0) {
1344 printk(KERN_WARNING "CIFS: Mount option noac not "
1345 "supported. Instead set "
1346 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1347 } else if (strnicmp(data, "fsc", 3) == 0) {
1348 vol->fsc = true;
1349 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1350 vol->mfsymlinks = true;
1351 } else if (strnicmp(data, "multiuser", 8) == 0) {
1352 vol->multiuser = true;
1353 } else
1354 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1355 data);
1356 }
1357 if (vol->UNC == NULL) {
1358 if (devname == NULL) {
1359 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1360 "target\n");
1361 return 1;
1362 }
1363 if ((temp_len = strnlen(devname, 300)) < 300) {
1364 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1365 if (vol->UNC == NULL)
1366 return 1;
1367 strcpy(vol->UNC, devname);
1368 if (strncmp(vol->UNC, "//", 2) == 0) {
1369 vol->UNC[0] = '\\';
1370 vol->UNC[1] = '\\';
1371 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1372 printk(KERN_WARNING "CIFS: UNC Path does not "
1373 "begin with // or \\\\ \n");
1374 return 1;
1375 }
1376 value = strpbrk(vol->UNC+2, "/\\");
1377 if (value)
1378 *value = '\\';
1379 } else {
1380 printk(KERN_WARNING "CIFS: UNC name too long\n");
1381 return 1;
1382 }
1383 }
1384
1385 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1386 cERROR(1, "Multiuser mounts currently require krb5 "
1387 "authentication!");
1388 return 1;
1389 }
1390
1391 if (vol->UNCip == NULL)
1392 vol->UNCip = &vol->UNC[2];
1393
1394 if (uid_specified)
1395 vol->override_uid = override_uid;
1396 else if (override_uid == 1)
1397 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1398 "specified with no uid= option.\n");
1399
1400 if (gid_specified)
1401 vol->override_gid = override_gid;
1402 else if (override_gid == 1)
1403 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1404 "specified with no gid= option.\n");
1405
1406 return 0;
1407 }
1408
1409 /** Returns true if srcaddr isn't specified and rhs isn't
1410 * specified, or if srcaddr is specified and
1411 * matches the IP address of the rhs argument.
1412 */
1413 static bool
1414 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1415 {
1416 switch (srcaddr->sa_family) {
1417 case AF_UNSPEC:
1418 return (rhs->sa_family == AF_UNSPEC);
1419 case AF_INET: {
1420 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1421 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1422 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1423 }
1424 case AF_INET6: {
1425 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1426 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1427 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1428 }
1429 default:
1430 WARN_ON(1);
1431 return false; /* don't expect to be here */
1432 }
1433 }
1434
1435
1436 static bool
1437 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1438 struct sockaddr *srcaddr)
1439 {
1440 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1441 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1442
1443 switch (addr->sa_family) {
1444 case AF_INET:
1445 if (addr4->sin_addr.s_addr !=
1446 server->addr.sockAddr.sin_addr.s_addr)
1447 return false;
1448 if (addr4->sin_port &&
1449 addr4->sin_port != server->addr.sockAddr.sin_port)
1450 return false;
1451 break;
1452 case AF_INET6:
1453 if (!ipv6_addr_equal(&addr6->sin6_addr,
1454 &server->addr.sockAddr6.sin6_addr))
1455 return false;
1456 if (addr6->sin6_scope_id !=
1457 server->addr.sockAddr6.sin6_scope_id)
1458 return false;
1459 if (addr6->sin6_port &&
1460 addr6->sin6_port != server->addr.sockAddr6.sin6_port)
1461 return false;
1462 break;
1463 }
1464
1465 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1466 return false;
1467
1468 return true;
1469 }
1470
1471 static bool
1472 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1473 {
1474 unsigned int secFlags;
1475
1476 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1477 secFlags = vol->secFlg;
1478 else
1479 secFlags = global_secflags | vol->secFlg;
1480
1481 switch (server->secType) {
1482 case LANMAN:
1483 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1484 return false;
1485 break;
1486 case NTLMv2:
1487 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1488 return false;
1489 break;
1490 case NTLM:
1491 if (!(secFlags & CIFSSEC_MAY_NTLM))
1492 return false;
1493 break;
1494 case Kerberos:
1495 if (!(secFlags & CIFSSEC_MAY_KRB5))
1496 return false;
1497 break;
1498 case RawNTLMSSP:
1499 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1500 return false;
1501 break;
1502 default:
1503 /* shouldn't happen */
1504 return false;
1505 }
1506
1507 /* now check if signing mode is acceptible */
1508 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1509 (server->secMode & SECMODE_SIGN_REQUIRED))
1510 return false;
1511 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1512 (server->secMode &
1513 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1514 return false;
1515
1516 return true;
1517 }
1518
1519 static struct TCP_Server_Info *
1520 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1521 {
1522 struct TCP_Server_Info *server;
1523
1524 write_lock(&cifs_tcp_ses_lock);
1525 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1526 if (!match_address(server, addr,
1527 (struct sockaddr *)&vol->srcaddr))
1528 continue;
1529
1530 if (!match_security(server, vol))
1531 continue;
1532
1533 ++server->srv_count;
1534 write_unlock(&cifs_tcp_ses_lock);
1535 cFYI(1, "Existing tcp session with server found");
1536 return server;
1537 }
1538 write_unlock(&cifs_tcp_ses_lock);
1539 return NULL;
1540 }
1541
1542 static void
1543 cifs_put_tcp_session(struct TCP_Server_Info *server)
1544 {
1545 struct task_struct *task;
1546
1547 write_lock(&cifs_tcp_ses_lock);
1548 if (--server->srv_count > 0) {
1549 write_unlock(&cifs_tcp_ses_lock);
1550 return;
1551 }
1552
1553 list_del_init(&server->tcp_ses_list);
1554 write_unlock(&cifs_tcp_ses_lock);
1555
1556 spin_lock(&GlobalMid_Lock);
1557 server->tcpStatus = CifsExiting;
1558 spin_unlock(&GlobalMid_Lock);
1559
1560 cifs_fscache_release_client_cookie(server);
1561
1562 task = xchg(&server->tsk, NULL);
1563 if (task)
1564 force_sig(SIGKILL, task);
1565 }
1566
1567 static struct TCP_Server_Info *
1568 cifs_get_tcp_session(struct smb_vol *volume_info)
1569 {
1570 struct TCP_Server_Info *tcp_ses = NULL;
1571 struct sockaddr_storage addr;
1572 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1573 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1574 int rc;
1575
1576 memset(&addr, 0, sizeof(struct sockaddr_storage));
1577
1578 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1579
1580 if (volume_info->UNCip && volume_info->UNC) {
1581 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1582 volume_info->UNCip,
1583 strlen(volume_info->UNCip),
1584 volume_info->port);
1585 if (!rc) {
1586 /* we failed translating address */
1587 rc = -EINVAL;
1588 goto out_err;
1589 }
1590 } else if (volume_info->UNCip) {
1591 /* BB using ip addr as tcp_ses name to connect to the
1592 DFS root below */
1593 cERROR(1, "Connecting to DFS root not implemented yet");
1594 rc = -EINVAL;
1595 goto out_err;
1596 } else /* which tcp_sess DFS root would we conect to */ {
1597 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1598 "unc=//192.168.1.100/public) specified");
1599 rc = -EINVAL;
1600 goto out_err;
1601 }
1602
1603 /* see if we already have a matching tcp_ses */
1604 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1605 if (tcp_ses)
1606 return tcp_ses;
1607
1608 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1609 if (!tcp_ses) {
1610 rc = -ENOMEM;
1611 goto out_err;
1612 }
1613
1614 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1615 if (IS_ERR(tcp_ses->hostname)) {
1616 rc = PTR_ERR(tcp_ses->hostname);
1617 goto out_err;
1618 }
1619
1620 tcp_ses->noblocksnd = volume_info->noblocksnd;
1621 tcp_ses->noautotune = volume_info->noautotune;
1622 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1623 atomic_set(&tcp_ses->inFlight, 0);
1624 init_waitqueue_head(&tcp_ses->response_q);
1625 init_waitqueue_head(&tcp_ses->request_q);
1626 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1627 mutex_init(&tcp_ses->srv_mutex);
1628 memcpy(tcp_ses->workstation_RFC1001_name,
1629 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1630 memcpy(tcp_ses->server_RFC1001_name,
1631 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1632 tcp_ses->sequence_number = 0;
1633 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1634 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1635
1636 /*
1637 * at this point we are the only ones with the pointer
1638 * to the struct since the kernel thread not created yet
1639 * no need to spinlock this init of tcpStatus or srv_count
1640 */
1641 tcp_ses->tcpStatus = CifsNew;
1642 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1643 sizeof(tcp_ses->srcaddr));
1644 ++tcp_ses->srv_count;
1645
1646 if (addr.ss_family == AF_INET6) {
1647 cFYI(1, "attempting ipv6 connect");
1648 /* BB should we allow ipv6 on port 139? */
1649 /* other OS never observed in Wild doing 139 with v6 */
1650 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1651 sizeof(struct sockaddr_in6));
1652 rc = ipv6_connect(tcp_ses);
1653 } else {
1654 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1655 sizeof(struct sockaddr_in));
1656 rc = ipv4_connect(tcp_ses);
1657 }
1658 if (rc < 0) {
1659 cERROR(1, "Error connecting to socket. Aborting operation");
1660 goto out_err;
1661 }
1662
1663 /*
1664 * since we're in a cifs function already, we know that
1665 * this will succeed. No need for try_module_get().
1666 */
1667 __module_get(THIS_MODULE);
1668 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1669 tcp_ses, "cifsd");
1670 if (IS_ERR(tcp_ses->tsk)) {
1671 rc = PTR_ERR(tcp_ses->tsk);
1672 cERROR(1, "error %d create cifsd thread", rc);
1673 module_put(THIS_MODULE);
1674 goto out_err;
1675 }
1676
1677 /* thread spawned, put it on the list */
1678 write_lock(&cifs_tcp_ses_lock);
1679 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1680 write_unlock(&cifs_tcp_ses_lock);
1681
1682 cifs_fscache_get_client_cookie(tcp_ses);
1683
1684 return tcp_ses;
1685
1686 out_err:
1687 if (tcp_ses) {
1688 if (!IS_ERR(tcp_ses->hostname))
1689 kfree(tcp_ses->hostname);
1690 if (tcp_ses->ssocket)
1691 sock_release(tcp_ses->ssocket);
1692 kfree(tcp_ses);
1693 }
1694 return ERR_PTR(rc);
1695 }
1696
1697 static struct cifsSesInfo *
1698 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1699 {
1700 struct cifsSesInfo *ses;
1701
1702 write_lock(&cifs_tcp_ses_lock);
1703 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1704 switch (server->secType) {
1705 case Kerberos:
1706 if (vol->cred_uid != ses->cred_uid)
1707 continue;
1708 break;
1709 default:
1710 /* anything else takes username/password */
1711 if (strncmp(ses->userName, vol->username,
1712 MAX_USERNAME_SIZE))
1713 continue;
1714 if (strlen(vol->username) != 0 &&
1715 ses->password != NULL &&
1716 strncmp(ses->password,
1717 vol->password ? vol->password : "",
1718 MAX_PASSWORD_SIZE))
1719 continue;
1720 }
1721 ++ses->ses_count;
1722 write_unlock(&cifs_tcp_ses_lock);
1723 return ses;
1724 }
1725 write_unlock(&cifs_tcp_ses_lock);
1726 return NULL;
1727 }
1728
1729 static void
1730 cifs_put_smb_ses(struct cifsSesInfo *ses)
1731 {
1732 int xid;
1733 struct TCP_Server_Info *server = ses->server;
1734
1735 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1736 write_lock(&cifs_tcp_ses_lock);
1737 if (--ses->ses_count > 0) {
1738 write_unlock(&cifs_tcp_ses_lock);
1739 return;
1740 }
1741
1742 list_del_init(&ses->smb_ses_list);
1743 write_unlock(&cifs_tcp_ses_lock);
1744
1745 if (ses->status == CifsGood) {
1746 xid = GetXid();
1747 CIFSSMBLogoff(xid, ses);
1748 _FreeXid(xid);
1749 }
1750 sesInfoFree(ses);
1751 cifs_put_tcp_session(server);
1752 }
1753
1754 static struct cifsSesInfo *
1755 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1756 {
1757 int rc = -ENOMEM, xid;
1758 struct cifsSesInfo *ses;
1759
1760 xid = GetXid();
1761
1762 ses = cifs_find_smb_ses(server, volume_info);
1763 if (ses) {
1764 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1765
1766 mutex_lock(&ses->session_mutex);
1767 rc = cifs_negotiate_protocol(xid, ses);
1768 if (rc) {
1769 mutex_unlock(&ses->session_mutex);
1770 /* problem -- put our ses reference */
1771 cifs_put_smb_ses(ses);
1772 FreeXid(xid);
1773 return ERR_PTR(rc);
1774 }
1775 if (ses->need_reconnect) {
1776 cFYI(1, "Session needs reconnect");
1777 rc = cifs_setup_session(xid, ses,
1778 volume_info->local_nls);
1779 if (rc) {
1780 mutex_unlock(&ses->session_mutex);
1781 /* problem -- put our reference */
1782 cifs_put_smb_ses(ses);
1783 FreeXid(xid);
1784 return ERR_PTR(rc);
1785 }
1786 }
1787 mutex_unlock(&ses->session_mutex);
1788
1789 /* existing SMB ses has a server reference already */
1790 cifs_put_tcp_session(server);
1791 FreeXid(xid);
1792 return ses;
1793 }
1794
1795 cFYI(1, "Existing smb sess not found");
1796 ses = sesInfoAlloc();
1797 if (ses == NULL)
1798 goto get_ses_fail;
1799
1800 ses->tilen = 0;
1801 ses->tiblob = NULL;
1802 /* new SMB session uses our server ref */
1803 ses->server = server;
1804 if (server->addr.sockAddr6.sin6_family == AF_INET6)
1805 sprintf(ses->serverName, "%pI6",
1806 &server->addr.sockAddr6.sin6_addr);
1807 else
1808 sprintf(ses->serverName, "%pI4",
1809 &server->addr.sockAddr.sin_addr.s_addr);
1810
1811 if (volume_info->username)
1812 strncpy(ses->userName, volume_info->username,
1813 MAX_USERNAME_SIZE);
1814
1815 /* volume_info->password freed at unmount */
1816 if (volume_info->password) {
1817 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1818 if (!ses->password)
1819 goto get_ses_fail;
1820 }
1821 if (volume_info->domainname) {
1822 int len = strlen(volume_info->domainname);
1823 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1824 if (ses->domainName)
1825 strcpy(ses->domainName, volume_info->domainname);
1826 }
1827 ses->cred_uid = volume_info->cred_uid;
1828 ses->linux_uid = volume_info->linux_uid;
1829 ses->overrideSecFlg = volume_info->secFlg;
1830
1831 mutex_lock(&ses->session_mutex);
1832 rc = cifs_negotiate_protocol(xid, ses);
1833 if (!rc)
1834 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1835 mutex_unlock(&ses->session_mutex);
1836 if (rc)
1837 goto get_ses_fail;
1838
1839 /* success, put it on the list */
1840 write_lock(&cifs_tcp_ses_lock);
1841 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1842 write_unlock(&cifs_tcp_ses_lock);
1843
1844 FreeXid(xid);
1845 return ses;
1846
1847 get_ses_fail:
1848 sesInfoFree(ses);
1849 FreeXid(xid);
1850 return ERR_PTR(rc);
1851 }
1852
1853 static struct cifsTconInfo *
1854 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1855 {
1856 struct list_head *tmp;
1857 struct cifsTconInfo *tcon;
1858
1859 write_lock(&cifs_tcp_ses_lock);
1860 list_for_each(tmp, &ses->tcon_list) {
1861 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1862 if (tcon->tidStatus == CifsExiting)
1863 continue;
1864 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1865 continue;
1866
1867 ++tcon->tc_count;
1868 write_unlock(&cifs_tcp_ses_lock);
1869 return tcon;
1870 }
1871 write_unlock(&cifs_tcp_ses_lock);
1872 return NULL;
1873 }
1874
1875 static void
1876 cifs_put_tcon(struct cifsTconInfo *tcon)
1877 {
1878 int xid;
1879 struct cifsSesInfo *ses = tcon->ses;
1880
1881 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1882 write_lock(&cifs_tcp_ses_lock);
1883 if (--tcon->tc_count > 0) {
1884 write_unlock(&cifs_tcp_ses_lock);
1885 return;
1886 }
1887
1888 list_del_init(&tcon->tcon_list);
1889 write_unlock(&cifs_tcp_ses_lock);
1890
1891 xid = GetXid();
1892 CIFSSMBTDis(xid, tcon);
1893 _FreeXid(xid);
1894
1895 cifs_fscache_release_super_cookie(tcon);
1896 tconInfoFree(tcon);
1897 cifs_put_smb_ses(ses);
1898 }
1899
1900 static struct cifsTconInfo *
1901 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1902 {
1903 int rc, xid;
1904 struct cifsTconInfo *tcon;
1905
1906 tcon = cifs_find_tcon(ses, volume_info->UNC);
1907 if (tcon) {
1908 cFYI(1, "Found match on UNC path");
1909 /* existing tcon already has a reference */
1910 cifs_put_smb_ses(ses);
1911 if (tcon->seal != volume_info->seal)
1912 cERROR(1, "transport encryption setting "
1913 "conflicts with existing tid");
1914 return tcon;
1915 }
1916
1917 tcon = tconInfoAlloc();
1918 if (tcon == NULL) {
1919 rc = -ENOMEM;
1920 goto out_fail;
1921 }
1922
1923 tcon->ses = ses;
1924 if (volume_info->password) {
1925 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1926 if (!tcon->password) {
1927 rc = -ENOMEM;
1928 goto out_fail;
1929 }
1930 }
1931
1932 if (strchr(volume_info->UNC + 3, '\\') == NULL
1933 && strchr(volume_info->UNC + 3, '/') == NULL) {
1934 cERROR(1, "Missing share name");
1935 rc = -ENODEV;
1936 goto out_fail;
1937 }
1938
1939 /* BB Do we need to wrap session_mutex around
1940 * this TCon call and Unix SetFS as
1941 * we do on SessSetup and reconnect? */
1942 xid = GetXid();
1943 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1944 FreeXid(xid);
1945 cFYI(1, "CIFS Tcon rc = %d", rc);
1946 if (rc)
1947 goto out_fail;
1948
1949 if (volume_info->nodfs) {
1950 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1951 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1952 }
1953 tcon->seal = volume_info->seal;
1954 /* we can have only one retry value for a connection
1955 to a share so for resources mounted more than once
1956 to the same server share the last value passed in
1957 for the retry flag is used */
1958 tcon->retry = volume_info->retry;
1959 tcon->nocase = volume_info->nocase;
1960 tcon->local_lease = volume_info->local_lease;
1961
1962 write_lock(&cifs_tcp_ses_lock);
1963 list_add(&tcon->tcon_list, &ses->tcon_list);
1964 write_unlock(&cifs_tcp_ses_lock);
1965
1966 cifs_fscache_get_super_cookie(tcon);
1967
1968 return tcon;
1969
1970 out_fail:
1971 tconInfoFree(tcon);
1972 return ERR_PTR(rc);
1973 }
1974
1975 void
1976 cifs_put_tlink(struct tcon_link *tlink)
1977 {
1978 if (!tlink || IS_ERR(tlink))
1979 return;
1980
1981 if (!atomic_dec_and_test(&tlink->tl_count) ||
1982 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
1983 tlink->tl_time = jiffies;
1984 return;
1985 }
1986
1987 if (!IS_ERR(tlink_tcon(tlink)))
1988 cifs_put_tcon(tlink_tcon(tlink));
1989 kfree(tlink);
1990 return;
1991 }
1992
1993 int
1994 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1995 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1996 struct dfs_info3_param **preferrals, int remap)
1997 {
1998 char *temp_unc;
1999 int rc = 0;
2000
2001 *pnum_referrals = 0;
2002 *preferrals = NULL;
2003
2004 if (pSesInfo->ipc_tid == 0) {
2005 temp_unc = kmalloc(2 /* for slashes */ +
2006 strnlen(pSesInfo->serverName,
2007 SERVER_NAME_LEN_WITH_NULL * 2)
2008 + 1 + 4 /* slash IPC$ */ + 2,
2009 GFP_KERNEL);
2010 if (temp_unc == NULL)
2011 return -ENOMEM;
2012 temp_unc[0] = '\\';
2013 temp_unc[1] = '\\';
2014 strcpy(temp_unc + 2, pSesInfo->serverName);
2015 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2016 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2017 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2018 kfree(temp_unc);
2019 }
2020 if (rc == 0)
2021 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2022 pnum_referrals, nls_codepage, remap);
2023 /* BB map targetUNCs to dfs_info3 structures, here or
2024 in CIFSGetDFSRefer BB */
2025
2026 return rc;
2027 }
2028
2029 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2030 static struct lock_class_key cifs_key[2];
2031 static struct lock_class_key cifs_slock_key[2];
2032
2033 static inline void
2034 cifs_reclassify_socket4(struct socket *sock)
2035 {
2036 struct sock *sk = sock->sk;
2037 BUG_ON(sock_owned_by_user(sk));
2038 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2039 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2040 }
2041
2042 static inline void
2043 cifs_reclassify_socket6(struct socket *sock)
2044 {
2045 struct sock *sk = sock->sk;
2046 BUG_ON(sock_owned_by_user(sk));
2047 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2048 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2049 }
2050 #else
2051 static inline void
2052 cifs_reclassify_socket4(struct socket *sock)
2053 {
2054 }
2055
2056 static inline void
2057 cifs_reclassify_socket6(struct socket *sock)
2058 {
2059 }
2060 #endif
2061
2062 /* See RFC1001 section 14 on representation of Netbios names */
2063 static void rfc1002mangle(char *target, char *source, unsigned int length)
2064 {
2065 unsigned int i, j;
2066
2067 for (i = 0, j = 0; i < (length); i++) {
2068 /* mask a nibble at a time and encode */
2069 target[j] = 'A' + (0x0F & (source[i] >> 4));
2070 target[j+1] = 'A' + (0x0F & source[i]);
2071 j += 2;
2072 }
2073
2074 }
2075
2076 static int
2077 bind_socket(struct TCP_Server_Info *server)
2078 {
2079 int rc = 0;
2080 if (server->srcaddr.ss_family != AF_UNSPEC) {
2081 /* Bind to the specified local IP address */
2082 struct socket *socket = server->ssocket;
2083 rc = socket->ops->bind(socket,
2084 (struct sockaddr *) &server->srcaddr,
2085 sizeof(server->srcaddr));
2086 if (rc < 0) {
2087 struct sockaddr_in *saddr4;
2088 struct sockaddr_in6 *saddr6;
2089 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2090 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2091 if (saddr6->sin6_family == AF_INET6)
2092 cERROR(1, "cifs: "
2093 "Failed to bind to: %pI6c, error: %d\n",
2094 &saddr6->sin6_addr, rc);
2095 else
2096 cERROR(1, "cifs: "
2097 "Failed to bind to: %pI4, error: %d\n",
2098 &saddr4->sin_addr.s_addr, rc);
2099 }
2100 }
2101 return rc;
2102 }
2103
2104 static int
2105 ipv4_connect(struct TCP_Server_Info *server)
2106 {
2107 int rc = 0;
2108 int val;
2109 bool connected = false;
2110 __be16 orig_port = 0;
2111 struct socket *socket = server->ssocket;
2112
2113 if (socket == NULL) {
2114 rc = sock_create_kern(PF_INET, SOCK_STREAM,
2115 IPPROTO_TCP, &socket);
2116 if (rc < 0) {
2117 cERROR(1, "Error %d creating socket", rc);
2118 return rc;
2119 }
2120
2121 /* BB other socket options to set KEEPALIVE, NODELAY? */
2122 cFYI(1, "Socket created");
2123 server->ssocket = socket;
2124 socket->sk->sk_allocation = GFP_NOFS;
2125 cifs_reclassify_socket4(socket);
2126 }
2127
2128 rc = bind_socket(server);
2129 if (rc < 0)
2130 return rc;
2131
2132 /* user overrode default port */
2133 if (server->addr.sockAddr.sin_port) {
2134 rc = socket->ops->connect(socket, (struct sockaddr *)
2135 &server->addr.sockAddr,
2136 sizeof(struct sockaddr_in), 0);
2137 if (rc >= 0)
2138 connected = true;
2139 }
2140
2141 if (!connected) {
2142 /* save original port so we can retry user specified port
2143 later if fall back ports fail this time */
2144 orig_port = server->addr.sockAddr.sin_port;
2145
2146 /* do not retry on the same port we just failed on */
2147 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
2148 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
2149 rc = socket->ops->connect(socket,
2150 (struct sockaddr *)
2151 &server->addr.sockAddr,
2152 sizeof(struct sockaddr_in), 0);
2153 if (rc >= 0)
2154 connected = true;
2155 }
2156 }
2157 if (!connected) {
2158 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
2159 rc = socket->ops->connect(socket, (struct sockaddr *)
2160 &server->addr.sockAddr,
2161 sizeof(struct sockaddr_in), 0);
2162 if (rc >= 0)
2163 connected = true;
2164 }
2165
2166 /* give up here - unless we want to retry on different
2167 protocol families some day */
2168 if (!connected) {
2169 if (orig_port)
2170 server->addr.sockAddr.sin_port = orig_port;
2171 cFYI(1, "Error %d connecting to server via ipv4", rc);
2172 sock_release(socket);
2173 server->ssocket = NULL;
2174 return rc;
2175 }
2176
2177
2178 /*
2179 * Eventually check for other socket options to change from
2180 * the default. sock_setsockopt not used because it expects
2181 * user space buffer
2182 */
2183 socket->sk->sk_rcvtimeo = 7 * HZ;
2184 socket->sk->sk_sndtimeo = 5 * HZ;
2185
2186 /* make the bufsizes depend on wsize/rsize and max requests */
2187 if (server->noautotune) {
2188 if (socket->sk->sk_sndbuf < (200 * 1024))
2189 socket->sk->sk_sndbuf = 200 * 1024;
2190 if (socket->sk->sk_rcvbuf < (140 * 1024))
2191 socket->sk->sk_rcvbuf = 140 * 1024;
2192 }
2193
2194 if (server->tcp_nodelay) {
2195 val = 1;
2196 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2197 (char *)&val, sizeof(val));
2198 if (rc)
2199 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2200 }
2201
2202 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2203 socket->sk->sk_sndbuf,
2204 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2205
2206 /* send RFC1001 sessinit */
2207 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2208 /* some servers require RFC1001 sessinit before sending
2209 negprot - BB check reconnection in case where second
2210 sessinit is sent but no second negprot */
2211 struct rfc1002_session_packet *ses_init_buf;
2212 struct smb_hdr *smb_buf;
2213 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2214 GFP_KERNEL);
2215 if (ses_init_buf) {
2216 ses_init_buf->trailer.session_req.called_len = 32;
2217 if (server->server_RFC1001_name &&
2218 server->server_RFC1001_name[0] != 0)
2219 rfc1002mangle(ses_init_buf->trailer.
2220 session_req.called_name,
2221 server->server_RFC1001_name,
2222 RFC1001_NAME_LEN_WITH_NULL);
2223 else
2224 rfc1002mangle(ses_init_buf->trailer.
2225 session_req.called_name,
2226 DEFAULT_CIFS_CALLED_NAME,
2227 RFC1001_NAME_LEN_WITH_NULL);
2228
2229 ses_init_buf->trailer.session_req.calling_len = 32;
2230
2231 /* calling name ends in null (byte 16) from old smb
2232 convention. */
2233 if (server->workstation_RFC1001_name &&
2234 server->workstation_RFC1001_name[0] != 0)
2235 rfc1002mangle(ses_init_buf->trailer.
2236 session_req.calling_name,
2237 server->workstation_RFC1001_name,
2238 RFC1001_NAME_LEN_WITH_NULL);
2239 else
2240 rfc1002mangle(ses_init_buf->trailer.
2241 session_req.calling_name,
2242 "LINUX_CIFS_CLNT",
2243 RFC1001_NAME_LEN_WITH_NULL);
2244
2245 ses_init_buf->trailer.session_req.scope1 = 0;
2246 ses_init_buf->trailer.session_req.scope2 = 0;
2247 smb_buf = (struct smb_hdr *)ses_init_buf;
2248 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2249 smb_buf->smb_buf_length = 0x81000044;
2250 rc = smb_send(server, smb_buf, 0x44);
2251 kfree(ses_init_buf);
2252 msleep(1); /* RFC1001 layer in at least one server
2253 requires very short break before negprot
2254 presumably because not expecting negprot
2255 to follow so fast. This is a simple
2256 solution that works without
2257 complicating the code and causes no
2258 significant slowing down on mount
2259 for everyone else */
2260 }
2261 /* else the negprot may still work without this
2262 even though malloc failed */
2263
2264 }
2265
2266 return rc;
2267 }
2268
2269 static int
2270 ipv6_connect(struct TCP_Server_Info *server)
2271 {
2272 int rc = 0;
2273 int val;
2274 bool connected = false;
2275 __be16 orig_port = 0;
2276 struct socket *socket = server->ssocket;
2277
2278 if (socket == NULL) {
2279 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2280 IPPROTO_TCP, &socket);
2281 if (rc < 0) {
2282 cERROR(1, "Error %d creating ipv6 socket", rc);
2283 socket = NULL;
2284 return rc;
2285 }
2286
2287 /* BB other socket options to set KEEPALIVE, NODELAY? */
2288 cFYI(1, "ipv6 Socket created");
2289 server->ssocket = socket;
2290 socket->sk->sk_allocation = GFP_NOFS;
2291 cifs_reclassify_socket6(socket);
2292 }
2293
2294 rc = bind_socket(server);
2295 if (rc < 0)
2296 return rc;
2297
2298 /* user overrode default port */
2299 if (server->addr.sockAddr6.sin6_port) {
2300 rc = socket->ops->connect(socket,
2301 (struct sockaddr *) &server->addr.sockAddr6,
2302 sizeof(struct sockaddr_in6), 0);
2303 if (rc >= 0)
2304 connected = true;
2305 }
2306
2307 if (!connected) {
2308 /* save original port so we can retry user specified port
2309 later if fall back ports fail this time */
2310
2311 orig_port = server->addr.sockAddr6.sin6_port;
2312 /* do not retry on the same port we just failed on */
2313 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2314 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2315 rc = socket->ops->connect(socket, (struct sockaddr *)
2316 &server->addr.sockAddr6,
2317 sizeof(struct sockaddr_in6), 0);
2318 if (rc >= 0)
2319 connected = true;
2320 }
2321 }
2322 if (!connected) {
2323 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2324 rc = socket->ops->connect(socket, (struct sockaddr *)
2325 &server->addr.sockAddr6,
2326 sizeof(struct sockaddr_in6), 0);
2327 if (rc >= 0)
2328 connected = true;
2329 }
2330
2331 /* give up here - unless we want to retry on different
2332 protocol families some day */
2333 if (!connected) {
2334 if (orig_port)
2335 server->addr.sockAddr6.sin6_port = orig_port;
2336 cFYI(1, "Error %d connecting to server via ipv6", rc);
2337 sock_release(socket);
2338 server->ssocket = NULL;
2339 return rc;
2340 }
2341
2342 /*
2343 * Eventually check for other socket options to change from
2344 * the default. sock_setsockopt not used because it expects
2345 * user space buffer
2346 */
2347 socket->sk->sk_rcvtimeo = 7 * HZ;
2348 socket->sk->sk_sndtimeo = 5 * HZ;
2349
2350 if (server->tcp_nodelay) {
2351 val = 1;
2352 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2353 (char *)&val, sizeof(val));
2354 if (rc)
2355 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2356 }
2357
2358 server->ssocket = socket;
2359
2360 return rc;
2361 }
2362
2363 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2364 struct super_block *sb, struct smb_vol *vol_info)
2365 {
2366 /* if we are reconnecting then should we check to see if
2367 * any requested capabilities changed locally e.g. via
2368 * remount but we can not do much about it here
2369 * if they have (even if we could detect it by the following)
2370 * Perhaps we could add a backpointer to array of sb from tcon
2371 * or if we change to make all sb to same share the same
2372 * sb as NFS - then we only have one backpointer to sb.
2373 * What if we wanted to mount the server share twice once with
2374 * and once without posixacls or posix paths? */
2375 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2376
2377 if (vol_info && vol_info->no_linux_ext) {
2378 tcon->fsUnixInfo.Capability = 0;
2379 tcon->unix_ext = 0; /* Unix Extensions disabled */
2380 cFYI(1, "Linux protocol extensions disabled");
2381 return;
2382 } else if (vol_info)
2383 tcon->unix_ext = 1; /* Unix Extensions supported */
2384
2385 if (tcon->unix_ext == 0) {
2386 cFYI(1, "Unix extensions disabled so not set on reconnect");
2387 return;
2388 }
2389
2390 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2391 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2392
2393 /* check for reconnect case in which we do not
2394 want to change the mount behavior if we can avoid it */
2395 if (vol_info == NULL) {
2396 /* turn off POSIX ACL and PATHNAMES if not set
2397 originally at mount time */
2398 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2399 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2400 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2401 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2402 cERROR(1, "POSIXPATH support change");
2403 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2404 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2405 cERROR(1, "possible reconnect error");
2406 cERROR(1, "server disabled POSIX path support");
2407 }
2408 }
2409
2410 cap &= CIFS_UNIX_CAP_MASK;
2411 if (vol_info && vol_info->no_psx_acl)
2412 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2413 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2414 cFYI(1, "negotiated posix acl support");
2415 if (sb)
2416 sb->s_flags |= MS_POSIXACL;
2417 }
2418
2419 if (vol_info && vol_info->posix_paths == 0)
2420 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2421 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2422 cFYI(1, "negotiate posix pathnames");
2423 if (sb)
2424 CIFS_SB(sb)->mnt_cifs_flags |=
2425 CIFS_MOUNT_POSIX_PATHS;
2426 }
2427
2428 /* We might be setting the path sep back to a different
2429 form if we are reconnecting and the server switched its
2430 posix path capability for this share */
2431 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2432 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2433
2434 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2435 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2436 CIFS_SB(sb)->rsize = 127 * 1024;
2437 cFYI(DBG2, "larger reads not supported by srv");
2438 }
2439 }
2440
2441
2442 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2443 #ifdef CONFIG_CIFS_DEBUG2
2444 if (cap & CIFS_UNIX_FCNTL_CAP)
2445 cFYI(1, "FCNTL cap");
2446 if (cap & CIFS_UNIX_EXTATTR_CAP)
2447 cFYI(1, "EXTATTR cap");
2448 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2449 cFYI(1, "POSIX path cap");
2450 if (cap & CIFS_UNIX_XATTR_CAP)
2451 cFYI(1, "XATTR cap");
2452 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2453 cFYI(1, "POSIX ACL cap");
2454 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2455 cFYI(1, "very large read cap");
2456 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2457 cFYI(1, "very large write cap");
2458 #endif /* CIFS_DEBUG2 */
2459 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2460 if (vol_info == NULL) {
2461 cFYI(1, "resetting capabilities failed");
2462 } else
2463 cERROR(1, "Negotiating Unix capabilities "
2464 "with the server failed. Consider "
2465 "mounting with the Unix Extensions\n"
2466 "disabled, if problems are found, "
2467 "by specifying the nounix mount "
2468 "option.");
2469
2470 }
2471 }
2472 }
2473
2474 static void
2475 convert_delimiter(char *path, char delim)
2476 {
2477 int i;
2478 char old_delim;
2479
2480 if (path == NULL)
2481 return;
2482
2483 if (delim == '/')
2484 old_delim = '\\';
2485 else
2486 old_delim = '/';
2487
2488 for (i = 0; path[i] != '\0'; i++) {
2489 if (path[i] == old_delim)
2490 path[i] = delim;
2491 }
2492 }
2493
2494 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2495 struct cifs_sb_info *cifs_sb)
2496 {
2497 if (pvolume_info->rsize > CIFSMaxBufSize) {
2498 cERROR(1, "rsize %d too large, using MaxBufSize",
2499 pvolume_info->rsize);
2500 cifs_sb->rsize = CIFSMaxBufSize;
2501 } else if ((pvolume_info->rsize) &&
2502 (pvolume_info->rsize <= CIFSMaxBufSize))
2503 cifs_sb->rsize = pvolume_info->rsize;
2504 else /* default */
2505 cifs_sb->rsize = CIFSMaxBufSize;
2506
2507 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2508 cERROR(1, "wsize %d too large, using 4096 instead",
2509 pvolume_info->wsize);
2510 cifs_sb->wsize = 4096;
2511 } else if (pvolume_info->wsize)
2512 cifs_sb->wsize = pvolume_info->wsize;
2513 else
2514 cifs_sb->wsize = min_t(const int,
2515 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2516 127*1024);
2517 /* old default of CIFSMaxBufSize was too small now
2518 that SMB Write2 can send multiple pages in kvec.
2519 RFC1001 does not describe what happens when frame
2520 bigger than 128K is sent so use that as max in
2521 conjunction with 52K kvec constraint on arch with 4K
2522 page size */
2523
2524 if (cifs_sb->rsize < 2048) {
2525 cifs_sb->rsize = 2048;
2526 /* Windows ME may prefer this */
2527 cFYI(1, "readsize set to minimum: 2048");
2528 }
2529 /* calculate prepath */
2530 cifs_sb->prepath = pvolume_info->prepath;
2531 if (cifs_sb->prepath) {
2532 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2533 /* we can not convert the / to \ in the path
2534 separators in the prefixpath yet because we do not
2535 know (until reset_cifs_unix_caps is called later)
2536 whether POSIX PATH CAP is available. We normalize
2537 the / to \ after reset_cifs_unix_caps is called */
2538 pvolume_info->prepath = NULL;
2539 } else
2540 cifs_sb->prepathlen = 0;
2541 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2542 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2543 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2544 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2545 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2546 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2547
2548 if (pvolume_info->noperm)
2549 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2550 if (pvolume_info->setuids)
2551 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2552 if (pvolume_info->server_ino)
2553 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2554 if (pvolume_info->remap)
2555 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2556 if (pvolume_info->no_xattr)
2557 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2558 if (pvolume_info->sfu_emul)
2559 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2560 if (pvolume_info->nobrl)
2561 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2562 if (pvolume_info->nostrictsync)
2563 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2564 if (pvolume_info->mand_lock)
2565 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2566 if (pvolume_info->cifs_acl)
2567 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2568 if (pvolume_info->override_uid)
2569 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2570 if (pvolume_info->override_gid)
2571 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2572 if (pvolume_info->dynperm)
2573 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2574 if (pvolume_info->fsc)
2575 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2576 if (pvolume_info->multiuser)
2577 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2578 CIFS_MOUNT_NO_PERM);
2579 if (pvolume_info->direct_io) {
2580 cFYI(1, "mounting share using direct i/o");
2581 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2582 }
2583 if (pvolume_info->mfsymlinks) {
2584 if (pvolume_info->sfu_emul) {
2585 cERROR(1, "mount option mfsymlinks ignored if sfu "
2586 "mount option is used");
2587 } else {
2588 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2589 }
2590 }
2591
2592 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2593 cERROR(1, "mount option dynperm ignored if cifsacl "
2594 "mount option supported");
2595 }
2596
2597 static int
2598 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2599 struct cifs_sb_info *cifs_sb, const char *full_path)
2600 {
2601 int rc;
2602 FILE_ALL_INFO *pfile_info;
2603
2604 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2605 if (pfile_info == NULL)
2606 return -ENOMEM;
2607
2608 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2609 0 /* not legacy */, cifs_sb->local_nls,
2610 cifs_sb->mnt_cifs_flags &
2611 CIFS_MOUNT_MAP_SPECIAL_CHR);
2612 kfree(pfile_info);
2613 return rc;
2614 }
2615
2616 static void
2617 cleanup_volume_info(struct smb_vol **pvolume_info)
2618 {
2619 struct smb_vol *volume_info;
2620
2621 if (!pvolume_info || !*pvolume_info)
2622 return;
2623
2624 volume_info = *pvolume_info;
2625 kzfree(volume_info->password);
2626 kfree(volume_info->UNC);
2627 kfree(volume_info->prepath);
2628 kfree(volume_info);
2629 *pvolume_info = NULL;
2630 return;
2631 }
2632
2633 #ifdef CONFIG_CIFS_DFS_UPCALL
2634 /* build_path_to_root returns full path to root when
2635 * we do not have an exiting connection (tcon) */
2636 static char *
2637 build_unc_path_to_root(const struct smb_vol *volume_info,
2638 const struct cifs_sb_info *cifs_sb)
2639 {
2640 char *full_path;
2641
2642 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2643 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2644 if (full_path == NULL)
2645 return ERR_PTR(-ENOMEM);
2646
2647 strncpy(full_path, volume_info->UNC, unc_len);
2648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2649 int i;
2650 for (i = 0; i < unc_len; i++) {
2651 if (full_path[i] == '\\')
2652 full_path[i] = '/';
2653 }
2654 }
2655
2656 if (cifs_sb->prepathlen)
2657 strncpy(full_path + unc_len, cifs_sb->prepath,
2658 cifs_sb->prepathlen);
2659
2660 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2661 return full_path;
2662 }
2663 #endif
2664
2665 int
2666 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2667 char *mount_data_global, const char *devname)
2668 {
2669 int rc;
2670 int xid;
2671 struct smb_vol *volume_info;
2672 struct cifsSesInfo *pSesInfo;
2673 struct cifsTconInfo *tcon;
2674 struct TCP_Server_Info *srvTcp;
2675 char *full_path;
2676 char *mount_data = mount_data_global;
2677 struct tcon_link *tlink;
2678 #ifdef CONFIG_CIFS_DFS_UPCALL
2679 struct dfs_info3_param *referrals = NULL;
2680 unsigned int num_referrals = 0;
2681 int referral_walks_count = 0;
2682 try_mount_again:
2683 #endif
2684 rc = 0;
2685 tcon = NULL;
2686 pSesInfo = NULL;
2687 srvTcp = NULL;
2688 full_path = NULL;
2689 tlink = NULL;
2690
2691 xid = GetXid();
2692
2693 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2694 if (!volume_info) {
2695 rc = -ENOMEM;
2696 goto out;
2697 }
2698
2699 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2700 rc = -EINVAL;
2701 goto out;
2702 }
2703
2704 if (volume_info->nullauth) {
2705 cFYI(1, "null user");
2706 volume_info->username = "";
2707 } else if (volume_info->username) {
2708 /* BB fixme parse for domain name here */
2709 cFYI(1, "Username: %s", volume_info->username);
2710 } else {
2711 cifserror("No username specified");
2712 /* In userspace mount helper we can get user name from alternate
2713 locations such as env variables and files on disk */
2714 rc = -EINVAL;
2715 goto out;
2716 }
2717
2718 /* this is needed for ASCII cp to Unicode converts */
2719 if (volume_info->iocharset == NULL) {
2720 /* load_nls_default cannot return null */
2721 volume_info->local_nls = load_nls_default();
2722 } else {
2723 volume_info->local_nls = load_nls(volume_info->iocharset);
2724 if (volume_info->local_nls == NULL) {
2725 cERROR(1, "CIFS mount error: iocharset %s not found",
2726 volume_info->iocharset);
2727 rc = -ELIBACC;
2728 goto out;
2729 }
2730 }
2731 cifs_sb->local_nls = volume_info->local_nls;
2732
2733 /* get a reference to a tcp session */
2734 srvTcp = cifs_get_tcp_session(volume_info);
2735 if (IS_ERR(srvTcp)) {
2736 rc = PTR_ERR(srvTcp);
2737 goto out;
2738 }
2739
2740 /* get a reference to a SMB session */
2741 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2742 if (IS_ERR(pSesInfo)) {
2743 rc = PTR_ERR(pSesInfo);
2744 pSesInfo = NULL;
2745 goto mount_fail_check;
2746 }
2747
2748 setup_cifs_sb(volume_info, cifs_sb);
2749 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2750 sb->s_maxbytes = MAX_LFS_FILESIZE;
2751 else
2752 sb->s_maxbytes = MAX_NON_LFS;
2753
2754 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2755 sb->s_time_gran = 100;
2756
2757 /* search for existing tcon to this server share */
2758 tcon = cifs_get_tcon(pSesInfo, volume_info);
2759 if (IS_ERR(tcon)) {
2760 rc = PTR_ERR(tcon);
2761 tcon = NULL;
2762 goto remote_path_check;
2763 }
2764
2765 /* do not care if following two calls succeed - informational */
2766 if (!tcon->ipc) {
2767 CIFSSMBQFSDeviceInfo(xid, tcon);
2768 CIFSSMBQFSAttributeInfo(xid, tcon);
2769 }
2770
2771 /* tell server which Unix caps we support */
2772 if (tcon->ses->capabilities & CAP_UNIX)
2773 /* reset of caps checks mount to see if unix extensions
2774 disabled for just this mount */
2775 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2776 else
2777 tcon->unix_ext = 0; /* server does not support them */
2778
2779 /* convert forward to back slashes in prepath here if needed */
2780 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2781 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2782
2783 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2784 cifs_sb->rsize = 1024 * 127;
2785 cFYI(DBG2, "no very large read support, rsize now 127K");
2786 }
2787 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2788 cifs_sb->wsize = min(cifs_sb->wsize,
2789 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2790 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2791 cifs_sb->rsize = min(cifs_sb->rsize,
2792 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2793
2794 remote_path_check:
2795 /* check if a whole path (including prepath) is not remote */
2796 if (!rc && cifs_sb->prepathlen && tcon) {
2797 /* build_path_to_root works only when we have a valid tcon */
2798 full_path = cifs_build_path_to_root(cifs_sb);
2799 if (full_path == NULL) {
2800 rc = -ENOMEM;
2801 goto mount_fail_check;
2802 }
2803 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2804 if (rc != -EREMOTE) {
2805 kfree(full_path);
2806 goto mount_fail_check;
2807 }
2808 kfree(full_path);
2809 }
2810
2811 /* get referral if needed */
2812 if (rc == -EREMOTE) {
2813 #ifdef CONFIG_CIFS_DFS_UPCALL
2814 if (referral_walks_count > MAX_NESTED_LINKS) {
2815 /*
2816 * BB: when we implement proper loop detection,
2817 * we will remove this check. But now we need it
2818 * to prevent an indefinite loop if 'DFS tree' is
2819 * misconfigured (i.e. has loops).
2820 */
2821 rc = -ELOOP;
2822 goto mount_fail_check;
2823 }
2824 /* convert forward to back slashes in prepath here if needed */
2825 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2826 convert_delimiter(cifs_sb->prepath,
2827 CIFS_DIR_SEP(cifs_sb));
2828 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2829 if (IS_ERR(full_path)) {
2830 rc = PTR_ERR(full_path);
2831 goto mount_fail_check;
2832 }
2833
2834 cFYI(1, "Getting referral for: %s", full_path);
2835 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2836 cifs_sb->local_nls, &num_referrals, &referrals,
2837 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2838 if (!rc && num_referrals > 0) {
2839 char *fake_devname = NULL;
2840
2841 if (mount_data != mount_data_global)
2842 kfree(mount_data);
2843
2844 mount_data = cifs_compose_mount_options(
2845 cifs_sb->mountdata, full_path + 1,
2846 referrals, &fake_devname);
2847
2848 free_dfs_info_array(referrals, num_referrals);
2849 kfree(fake_devname);
2850 kfree(full_path);
2851
2852 if (IS_ERR(mount_data)) {
2853 rc = PTR_ERR(mount_data);
2854 mount_data = NULL;
2855 goto mount_fail_check;
2856 }
2857
2858 if (tcon)
2859 cifs_put_tcon(tcon);
2860 else if (pSesInfo)
2861 cifs_put_smb_ses(pSesInfo);
2862
2863 cleanup_volume_info(&volume_info);
2864 referral_walks_count++;
2865 FreeXid(xid);
2866 goto try_mount_again;
2867 }
2868 #else /* No DFS support, return error on mount */
2869 rc = -EOPNOTSUPP;
2870 #endif
2871 }
2872
2873 if (rc)
2874 goto mount_fail_check;
2875
2876 /* now, hang the tcon off of the superblock */
2877 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2878 if (tlink == NULL) {
2879 rc = -ENOMEM;
2880 goto mount_fail_check;
2881 }
2882
2883 tlink->tl_index = pSesInfo->linux_uid;
2884 tlink->tl_tcon = tcon;
2885 tlink->tl_time = jiffies;
2886 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2887 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2888
2889 rc = radix_tree_preload(GFP_KERNEL);
2890 if (rc == -ENOMEM) {
2891 kfree(tlink);
2892 goto mount_fail_check;
2893 }
2894
2895 spin_lock(&cifs_sb->tlink_tree_lock);
2896 radix_tree_insert(&cifs_sb->tlink_tree, pSesInfo->linux_uid, tlink);
2897 radix_tree_tag_set(&cifs_sb->tlink_tree, pSesInfo->linux_uid,
2898 CIFS_TLINK_MASTER_TAG);
2899 spin_unlock(&cifs_sb->tlink_tree_lock);
2900 radix_tree_preload_end();
2901
2902 mount_fail_check:
2903 /* on error free sesinfo and tcon struct if needed */
2904 if (rc) {
2905 if (mount_data != mount_data_global)
2906 kfree(mount_data);
2907 /* If find_unc succeeded then rc == 0 so we can not end */
2908 /* up accidently freeing someone elses tcon struct */
2909 if (tcon)
2910 cifs_put_tcon(tcon);
2911 else if (pSesInfo)
2912 cifs_put_smb_ses(pSesInfo);
2913 else
2914 cifs_put_tcp_session(srvTcp);
2915 goto out;
2916 }
2917
2918 /* volume_info->password is freed above when existing session found
2919 (in which case it is not needed anymore) but when new sesion is created
2920 the password ptr is put in the new session structure (in which case the
2921 password will be freed at unmount time) */
2922 out:
2923 /* zero out password before freeing */
2924 cleanup_volume_info(&volume_info);
2925 FreeXid(xid);
2926 return rc;
2927 }
2928
2929 int
2930 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2931 const char *tree, struct cifsTconInfo *tcon,
2932 const struct nls_table *nls_codepage)
2933 {
2934 struct smb_hdr *smb_buffer;
2935 struct smb_hdr *smb_buffer_response;
2936 TCONX_REQ *pSMB;
2937 TCONX_RSP *pSMBr;
2938 unsigned char *bcc_ptr;
2939 int rc = 0;
2940 int length, bytes_left;
2941 __u16 count;
2942
2943 if (ses == NULL)
2944 return -EIO;
2945
2946 smb_buffer = cifs_buf_get();
2947 if (smb_buffer == NULL)
2948 return -ENOMEM;
2949
2950 smb_buffer_response = smb_buffer;
2951
2952 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2953 NULL /*no tid */ , 4 /*wct */ );
2954
2955 smb_buffer->Mid = GetNextMid(ses->server);
2956 smb_buffer->Uid = ses->Suid;
2957 pSMB = (TCONX_REQ *) smb_buffer;
2958 pSMBr = (TCONX_RSP *) smb_buffer_response;
2959
2960 pSMB->AndXCommand = 0xFF;
2961 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2962 bcc_ptr = &pSMB->Password[0];
2963 if ((ses->server->secMode) & SECMODE_USER) {
2964 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2965 *bcc_ptr = 0; /* password is null byte */
2966 bcc_ptr++; /* skip password */
2967 /* already aligned so no need to do it below */
2968 } else {
2969 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2970 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2971 specified as required (when that support is added to
2972 the vfs in the future) as only NTLM or the much
2973 weaker LANMAN (which we do not send by default) is accepted
2974 by Samba (not sure whether other servers allow
2975 NTLMv2 password here) */
2976 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2977 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2978 (ses->server->secType == LANMAN))
2979 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2980 ses->server->secMode &
2981 SECMODE_PW_ENCRYPT ? true : false,
2982 bcc_ptr);
2983 else
2984 #endif /* CIFS_WEAK_PW_HASH */
2985 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2986 bcc_ptr);
2987
2988 bcc_ptr += CIFS_SESS_KEY_SIZE;
2989 if (ses->capabilities & CAP_UNICODE) {
2990 /* must align unicode strings */
2991 *bcc_ptr = 0; /* null byte password */
2992 bcc_ptr++;
2993 }
2994 }
2995
2996 if (ses->server->secMode &
2997 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2998 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2999
3000 if (ses->capabilities & CAP_STATUS32) {
3001 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3002 }
3003 if (ses->capabilities & CAP_DFS) {
3004 smb_buffer->Flags2 |= SMBFLG2_DFS;
3005 }
3006 if (ses->capabilities & CAP_UNICODE) {
3007 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3008 length =
3009 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3010 6 /* max utf8 char length in bytes */ *
3011 (/* server len*/ + 256 /* share len */), nls_codepage);
3012 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3013 bcc_ptr += 2; /* skip trailing null */
3014 } else { /* ASCII */
3015 strcpy(bcc_ptr, tree);
3016 bcc_ptr += strlen(tree) + 1;
3017 }
3018 strcpy(bcc_ptr, "?????");
3019 bcc_ptr += strlen("?????");
3020 bcc_ptr += 1;
3021 count = bcc_ptr - &pSMB->Password[0];
3022 pSMB->hdr.smb_buf_length += count;
3023 pSMB->ByteCount = cpu_to_le16(count);
3024
3025 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3026 CIFS_STD_OP);
3027
3028 /* above now done in SendReceive */
3029 if ((rc == 0) && (tcon != NULL)) {
3030 bool is_unicode;
3031
3032 tcon->tidStatus = CifsGood;
3033 tcon->need_reconnect = false;
3034 tcon->tid = smb_buffer_response->Tid;
3035 bcc_ptr = pByteArea(smb_buffer_response);
3036 bytes_left = BCC(smb_buffer_response);
3037 length = strnlen(bcc_ptr, bytes_left - 2);
3038 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3039 is_unicode = true;
3040 else
3041 is_unicode = false;
3042
3043
3044 /* skip service field (NB: this field is always ASCII) */
3045 if (length == 3) {
3046 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3047 (bcc_ptr[2] == 'C')) {
3048 cFYI(1, "IPC connection");
3049 tcon->ipc = 1;
3050 }
3051 } else if (length == 2) {
3052 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3053 /* the most common case */
3054 cFYI(1, "disk share connection");
3055 }
3056 }
3057 bcc_ptr += length + 1;
3058 bytes_left -= (length + 1);
3059 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3060
3061 /* mostly informational -- no need to fail on error here */
3062 kfree(tcon->nativeFileSystem);
3063 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3064 bytes_left, is_unicode,
3065 nls_codepage);
3066
3067 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3068
3069 if ((smb_buffer_response->WordCount == 3) ||
3070 (smb_buffer_response->WordCount == 7))
3071 /* field is in same location */
3072 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3073 else
3074 tcon->Flags = 0;
3075 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3076 } else if ((rc == 0) && tcon == NULL) {
3077 /* all we need to save for IPC$ connection */
3078 ses->ipc_tid = smb_buffer_response->Tid;
3079 }
3080
3081 cifs_buf_release(smb_buffer);
3082 return rc;
3083 }
3084
3085 int
3086 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3087 {
3088 int i, ret;
3089 char *tmp;
3090 struct tcon_link *tlink[8];
3091 unsigned long index = 0;
3092
3093 do {
3094 spin_lock(&cifs_sb->tlink_tree_lock);
3095 ret = radix_tree_gang_lookup(&cifs_sb->tlink_tree,
3096 (void **)tlink, index,
3097 ARRAY_SIZE(tlink));
3098 /* increment index for next pass */
3099 if (ret > 0)
3100 index = tlink[ret - 1]->tl_index + 1;
3101 for (i = 0; i < ret; i++) {
3102 cifs_get_tlink(tlink[i]);
3103 clear_bit(TCON_LINK_IN_TREE, &tlink[i]->tl_flags);
3104 radix_tree_delete(&cifs_sb->tlink_tree,
3105 tlink[i]->tl_index);
3106 }
3107 spin_unlock(&cifs_sb->tlink_tree_lock);
3108
3109 for (i = 0; i < ret; i++)
3110 cifs_put_tlink(tlink[i]);
3111 } while (ret != 0);
3112
3113 tmp = cifs_sb->prepath;
3114 cifs_sb->prepathlen = 0;
3115 cifs_sb->prepath = NULL;
3116 kfree(tmp);
3117
3118 return 0;
3119 }
3120
3121 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3122 {
3123 int rc = 0;
3124 struct TCP_Server_Info *server = ses->server;
3125
3126 /* only send once per connect */
3127 if (server->maxBuf != 0)
3128 return 0;
3129
3130 rc = CIFSSMBNegotiate(xid, ses);
3131 if (rc == -EAGAIN) {
3132 /* retry only once on 1st time connection */
3133 rc = CIFSSMBNegotiate(xid, ses);
3134 if (rc == -EAGAIN)
3135 rc = -EHOSTDOWN;
3136 }
3137 if (rc == 0) {
3138 spin_lock(&GlobalMid_Lock);
3139 if (server->tcpStatus != CifsExiting)
3140 server->tcpStatus = CifsGood;
3141 else
3142 rc = -EHOSTDOWN;
3143 spin_unlock(&GlobalMid_Lock);
3144
3145 }
3146
3147 return rc;
3148 }
3149
3150
3151 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3152 struct nls_table *nls_info)
3153 {
3154 int rc = 0;
3155 struct TCP_Server_Info *server = ses->server;
3156
3157 ses->flags = 0;
3158 ses->capabilities = server->capabilities;
3159 if (linuxExtEnabled == 0)
3160 ses->capabilities &= (~CAP_UNIX);
3161
3162 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3163 server->secMode, server->capabilities, server->timeAdj);
3164
3165 rc = CIFS_SessSetup(xid, ses, nls_info);
3166 if (rc) {
3167 cERROR(1, "Send error in SessSetup = %d", rc);
3168 } else {
3169 cFYI(1, "CIFS Session Established successfully");
3170 spin_lock(&GlobalMid_Lock);
3171 ses->status = CifsGood;
3172 ses->need_reconnect = false;
3173 spin_unlock(&GlobalMid_Lock);
3174 }
3175
3176 return rc;
3177 }
3178
3179 struct cifsTconInfo *
3180 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3181 {
3182 struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3183 struct cifsSesInfo *ses;
3184 struct cifsTconInfo *tcon = NULL;
3185 struct smb_vol *vol_info;
3186 char username[MAX_USERNAME_SIZE + 1];
3187
3188 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3189 if (vol_info == NULL) {
3190 tcon = ERR_PTR(-ENOMEM);
3191 goto out;
3192 }
3193
3194 snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3195 vol_info->username = username;
3196 vol_info->local_nls = cifs_sb->local_nls;
3197 vol_info->linux_uid = fsuid;
3198 vol_info->cred_uid = fsuid;
3199 vol_info->UNC = master_tcon->treeName;
3200 vol_info->retry = master_tcon->retry;
3201 vol_info->nocase = master_tcon->nocase;
3202 vol_info->local_lease = master_tcon->local_lease;
3203 vol_info->no_linux_ext = !master_tcon->unix_ext;
3204
3205 /* FIXME: allow for other secFlg settings */
3206 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3207
3208 /* get a reference for the same TCP session */
3209 write_lock(&cifs_tcp_ses_lock);
3210 ++master_tcon->ses->server->srv_count;
3211 write_unlock(&cifs_tcp_ses_lock);
3212
3213 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3214 if (IS_ERR(ses)) {
3215 tcon = (struct cifsTconInfo *)ses;
3216 cifs_put_tcp_session(master_tcon->ses->server);
3217 goto out;
3218 }
3219
3220 tcon = cifs_get_tcon(ses, vol_info);
3221 if (IS_ERR(tcon)) {
3222 cifs_put_smb_ses(ses);
3223 goto out;
3224 }
3225
3226 if (ses->capabilities & CAP_UNIX)
3227 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3228 out:
3229 kfree(vol_info);
3230
3231 return tcon;
3232 }
3233
3234 static struct tcon_link *
3235 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3236 {
3237 struct tcon_link *tlink;
3238 unsigned int ret;
3239
3240 spin_lock(&cifs_sb->tlink_tree_lock);
3241 ret = radix_tree_gang_lookup_tag(&cifs_sb->tlink_tree, (void **)&tlink,
3242 0, 1, CIFS_TLINK_MASTER_TAG);
3243 spin_unlock(&cifs_sb->tlink_tree_lock);
3244
3245 /* the master tcon should always be present */
3246 if (ret == 0)
3247 BUG();
3248
3249 return tlink;
3250 }
3251
3252 struct cifsTconInfo *
3253 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3254 {
3255 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3256 }
3257
3258 static int
3259 cifs_sb_tcon_pending_wait(void *unused)
3260 {
3261 schedule();
3262 return signal_pending(current) ? -ERESTARTSYS : 0;
3263 }
3264
3265 /*
3266 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3267 * current task.
3268 *
3269 * If the superblock doesn't refer to a multiuser mount, then just return
3270 * the master tcon for the mount.
3271 *
3272 * First, search the radix tree for an existing tcon for this fsuid. If one
3273 * exists, then check to see if it's pending construction. If it is then wait
3274 * for construction to complete. Once it's no longer pending, check to see if
3275 * it failed and either return an error or retry construction, depending on
3276 * the timeout.
3277 *
3278 * If one doesn't exist then insert a new tcon_link struct into the tree and
3279 * try to construct a new one.
3280 */
3281 struct tcon_link *
3282 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3283 {
3284 int ret;
3285 unsigned long fsuid = (unsigned long) current_fsuid();
3286 struct tcon_link *tlink, *newtlink;
3287
3288 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3289 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3290
3291 spin_lock(&cifs_sb->tlink_tree_lock);
3292 tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
3293 if (tlink)
3294 cifs_get_tlink(tlink);
3295 spin_unlock(&cifs_sb->tlink_tree_lock);
3296
3297 if (tlink == NULL) {
3298 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3299 if (newtlink == NULL)
3300 return ERR_PTR(-ENOMEM);
3301 newtlink->tl_index = fsuid;
3302 newtlink->tl_tcon = ERR_PTR(-EACCES);
3303 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3304 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3305 cifs_get_tlink(newtlink);
3306
3307 ret = radix_tree_preload(GFP_KERNEL);
3308 if (ret != 0) {
3309 kfree(newtlink);
3310 return ERR_PTR(ret);
3311 }
3312
3313 spin_lock(&cifs_sb->tlink_tree_lock);
3314 /* was one inserted after previous search? */
3315 tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
3316 if (tlink) {
3317 cifs_get_tlink(tlink);
3318 spin_unlock(&cifs_sb->tlink_tree_lock);
3319 radix_tree_preload_end();
3320 kfree(newtlink);
3321 goto wait_for_construction;
3322 }
3323 ret = radix_tree_insert(&cifs_sb->tlink_tree, fsuid, newtlink);
3324 spin_unlock(&cifs_sb->tlink_tree_lock);
3325 radix_tree_preload_end();
3326 if (ret) {
3327 kfree(newtlink);
3328 return ERR_PTR(ret);
3329 }
3330 tlink = newtlink;
3331 } else {
3332 wait_for_construction:
3333 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3334 cifs_sb_tcon_pending_wait,
3335 TASK_INTERRUPTIBLE);
3336 if (ret) {
3337 cifs_put_tlink(tlink);
3338 return ERR_PTR(ret);
3339 }
3340
3341 /* if it's good, return it */
3342 if (!IS_ERR(tlink->tl_tcon))
3343 return tlink;
3344
3345 /* return error if we tried this already recently */
3346 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3347 cifs_put_tlink(tlink);
3348 return ERR_PTR(-EACCES);
3349 }
3350
3351 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3352 goto wait_for_construction;
3353 }
3354
3355 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3356 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3357 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3358
3359 if (IS_ERR(tlink->tl_tcon)) {
3360 cifs_put_tlink(tlink);
3361 return ERR_PTR(-EACCES);
3362 }
3363
3364 return tlink;
3365 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree