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sky2: Set SKY2_HW_RAM_BUFFER in sky2_init
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob1f3345d7fa79a5e5dffc6f7be54f9734873ed3da
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/pagemap.h>
27 #include <linux/ctype.h>
28 #include <linux/utsname.h>
29 #include <linux/mempool.h>
30 #include <linux/delay.h>
31 #include <linux/completion.h>
32 #include <linux/kthread.h>
33 #include <linux/pagevec.h>
34 #include <linux/freezer.h>
35 #include <linux/namei.h>
36 #include <asm/uaccess.h>
37 #include <asm/processor.h>
38 #include <linux/inet.h>
39 #include <net/ipv6.h>
40 #include "cifspdu.h"
41 #include "cifsglob.h"
42 #include "cifsproto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include "ntlmssp.h"
47 #include "nterr.h"
48 #include "rfc1002pdu.h"
49 #include "cn_cifs.h"
50
51 #define CIFS_PORT 445
52 #define RFC1001_PORT 139
53
54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
55 unsigned char *p24);
56
57 extern mempool_t *cifs_req_poolp;
58
59 struct smb_vol {
60 char *username;
61 char *password;
62 char *domainname;
63 char *UNC;
64 char *UNCip;
65 char *iocharset; /* local code page for mapping to and from Unicode */
66 char source_rfc1001_name[16]; /* netbios name of client */
67 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
68 uid_t linux_uid;
69 gid_t linux_gid;
70 mode_t file_mode;
71 mode_t dir_mode;
72 unsigned secFlg;
73 bool retry:1;
74 bool intr:1;
75 bool setuids:1;
76 bool override_uid:1;
77 bool override_gid:1;
78 bool dynperm:1;
79 bool noperm:1;
80 bool no_psx_acl:1; /* set if posix acl support should be disabled */
81 bool cifs_acl:1;
82 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
83 bool server_ino:1; /* use inode numbers from server ie UniqueId */
84 bool direct_io:1;
85 bool remap:1; /* set to remap seven reserved chars in filenames */
86 bool posix_paths:1; /* unset to not ask for posix pathnames. */
87 bool no_linux_ext:1;
88 bool sfu_emul:1;
89 bool nullauth:1; /* attempt to authenticate with null user */
90 bool nocase:1; /* request case insensitive filenames */
91 bool nobrl:1; /* disable sending byte range locks to srv */
92 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
93 bool seal:1; /* request transport encryption on share */
94 bool nodfs:1; /* Do not request DFS, even if available */
95 bool local_lease:1; /* check leases only on local system, not remote */
96 bool noblocksnd:1;
97 bool noautotune:1;
98 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
99 unsigned int rsize;
100 unsigned int wsize;
101 unsigned int sockopt;
102 unsigned short int port;
103 char *prepath;
104 };
105
106 static int ipv4_connect(struct TCP_Server_Info *server);
107 static int ipv6_connect(struct TCP_Server_Info *server);
108
109 /*
110 * cifs tcp session reconnection
111 *
112 * mark tcp session as reconnecting so temporarily locked
113 * mark all smb sessions as reconnecting for tcp session
114 * reconnect tcp session
115 * wake up waiters on reconnection? - (not needed currently)
116 */
117 static int
118 cifs_reconnect(struct TCP_Server_Info *server)
119 {
120 int rc = 0;
121 struct list_head *tmp, *tmp2;
122 struct cifsSesInfo *ses;
123 struct cifsTconInfo *tcon;
124 struct mid_q_entry *mid_entry;
125
126 spin_lock(&GlobalMid_Lock);
127 if (server->tcpStatus == CifsExiting) {
128 /* the demux thread will exit normally
129 next time through the loop */
130 spin_unlock(&GlobalMid_Lock);
131 return rc;
132 } else
133 server->tcpStatus = CifsNeedReconnect;
134 spin_unlock(&GlobalMid_Lock);
135 server->maxBuf = 0;
136
137 cFYI(1, ("Reconnecting tcp session"));
138
139 /* before reconnecting the tcp session, mark the smb session (uid)
140 and the tid bad so they are not used until reconnected */
141 read_lock(&cifs_tcp_ses_lock);
142 list_for_each(tmp, &server->smb_ses_list) {
143 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
144 ses->need_reconnect = true;
145 ses->ipc_tid = 0;
146 list_for_each(tmp2, &ses->tcon_list) {
147 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
148 tcon->need_reconnect = true;
149 }
150 }
151 read_unlock(&cifs_tcp_ses_lock);
152 /* do not want to be sending data on a socket we are freeing */
153 mutex_lock(&server->srv_mutex);
154 if (server->ssocket) {
155 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
156 server->ssocket->flags));
157 kernel_sock_shutdown(server->ssocket, SHUT_WR);
158 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
159 server->ssocket->state,
160 server->ssocket->flags));
161 sock_release(server->ssocket);
162 server->ssocket = NULL;
163 }
164
165 spin_lock(&GlobalMid_Lock);
166 list_for_each(tmp, &server->pending_mid_q) {
167 mid_entry = list_entry(tmp, struct
168 mid_q_entry,
169 qhead);
170 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
171 /* Mark other intransit requests as needing
172 retry so we do not immediately mark the
173 session bad again (ie after we reconnect
174 below) as they timeout too */
175 mid_entry->midState = MID_RETRY_NEEDED;
176 }
177 }
178 spin_unlock(&GlobalMid_Lock);
179 mutex_unlock(&server->srv_mutex);
180
181 while ((server->tcpStatus != CifsExiting) &&
182 (server->tcpStatus != CifsGood)) {
183 try_to_freeze();
184 if (server->addr.sockAddr6.sin6_family == AF_INET6)
185 rc = ipv6_connect(server);
186 else
187 rc = ipv4_connect(server);
188 if (rc) {
189 cFYI(1, ("reconnect error %d", rc));
190 msleep(3000);
191 } else {
192 atomic_inc(&tcpSesReconnectCount);
193 spin_lock(&GlobalMid_Lock);
194 if (server->tcpStatus != CifsExiting)
195 server->tcpStatus = CifsGood;
196 server->sequence_number = 0;
197 spin_unlock(&GlobalMid_Lock);
198 /* atomic_set(&server->inFlight,0);*/
199 wake_up(&server->response_q);
200 }
201 }
202 return rc;
203 }
204
205 /*
206 return codes:
207 0 not a transact2, or all data present
208 >0 transact2 with that much data missing
209 -EINVAL = invalid transact2
210
211 */
212 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
213 {
214 struct smb_t2_rsp *pSMBt;
215 int total_data_size;
216 int data_in_this_rsp;
217 int remaining;
218
219 if (pSMB->Command != SMB_COM_TRANSACTION2)
220 return 0;
221
222 /* check for plausible wct, bcc and t2 data and parm sizes */
223 /* check for parm and data offset going beyond end of smb */
224 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
225 cFYI(1, ("invalid transact2 word count"));
226 return -EINVAL;
227 }
228
229 pSMBt = (struct smb_t2_rsp *)pSMB;
230
231 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
232 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
233
234 remaining = total_data_size - data_in_this_rsp;
235
236 if (remaining == 0)
237 return 0;
238 else if (remaining < 0) {
239 cFYI(1, ("total data %d smaller than data in frame %d",
240 total_data_size, data_in_this_rsp));
241 return -EINVAL;
242 } else {
243 cFYI(1, ("missing %d bytes from transact2, check next response",
244 remaining));
245 if (total_data_size > maxBufSize) {
246 cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
247 total_data_size, maxBufSize));
248 return -EINVAL;
249 }
250 return remaining;
251 }
252 }
253
254 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
255 {
256 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
257 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
258 int total_data_size;
259 int total_in_buf;
260 int remaining;
261 int total_in_buf2;
262 char *data_area_of_target;
263 char *data_area_of_buf2;
264 __u16 byte_count;
265
266 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
267
268 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
269 cFYI(1, ("total data size of primary and secondary t2 differ"));
270 }
271
272 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
273
274 remaining = total_data_size - total_in_buf;
275
276 if (remaining < 0)
277 return -EINVAL;
278
279 if (remaining == 0) /* nothing to do, ignore */
280 return 0;
281
282 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
283 if (remaining < total_in_buf2) {
284 cFYI(1, ("transact2 2nd response contains too much data"));
285 }
286
287 /* find end of first SMB data area */
288 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
289 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
290 /* validate target area */
291
292 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
293 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
294
295 data_area_of_target += total_in_buf;
296
297 /* copy second buffer into end of first buffer */
298 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
299 total_in_buf += total_in_buf2;
300 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
301 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
302 byte_count += total_in_buf2;
303 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
304
305 byte_count = pTargetSMB->smb_buf_length;
306 byte_count += total_in_buf2;
307
308 /* BB also add check that we are not beyond maximum buffer size */
309
310 pTargetSMB->smb_buf_length = byte_count;
311
312 if (remaining == total_in_buf2) {
313 cFYI(1, ("found the last secondary response"));
314 return 0; /* we are done */
315 } else /* more responses to go */
316 return 1;
317
318 }
319
320 static int
321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
322 {
323 int length;
324 unsigned int pdu_length, total_read;
325 struct smb_hdr *smb_buffer = NULL;
326 struct smb_hdr *bigbuf = NULL;
327 struct smb_hdr *smallbuf = NULL;
328 struct msghdr smb_msg;
329 struct kvec iov;
330 struct socket *csocket = server->ssocket;
331 struct list_head *tmp;
332 struct cifsSesInfo *ses;
333 struct task_struct *task_to_wake = NULL;
334 struct mid_q_entry *mid_entry;
335 char temp;
336 bool isLargeBuf = false;
337 bool isMultiRsp;
338 int reconnect;
339
340 current->flags |= PF_MEMALLOC;
341 cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
342
343 length = atomic_inc_return(&tcpSesAllocCount);
344 if (length > 1)
345 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
346 GFP_KERNEL);
347
348 set_freezable();
349 while (server->tcpStatus != CifsExiting) {
350 if (try_to_freeze())
351 continue;
352 if (bigbuf == NULL) {
353 bigbuf = cifs_buf_get();
354 if (!bigbuf) {
355 cERROR(1, ("No memory for large SMB response"));
356 msleep(3000);
357 /* retry will check if exiting */
358 continue;
359 }
360 } else if (isLargeBuf) {
361 /* we are reusing a dirty large buf, clear its start */
362 memset(bigbuf, 0, sizeof(struct smb_hdr));
363 }
364
365 if (smallbuf == NULL) {
366 smallbuf = cifs_small_buf_get();
367 if (!smallbuf) {
368 cERROR(1, ("No memory for SMB response"));
369 msleep(1000);
370 /* retry will check if exiting */
371 continue;
372 }
373 /* beginning of smb buffer is cleared in our buf_get */
374 } else /* if existing small buf clear beginning */
375 memset(smallbuf, 0, sizeof(struct smb_hdr));
376
377 isLargeBuf = false;
378 isMultiRsp = false;
379 smb_buffer = smallbuf;
380 iov.iov_base = smb_buffer;
381 iov.iov_len = 4;
382 smb_msg.msg_control = NULL;
383 smb_msg.msg_controllen = 0;
384 pdu_length = 4; /* enough to get RFC1001 header */
385 incomplete_rcv:
386 length =
387 kernel_recvmsg(csocket, &smb_msg,
388 &iov, 1, pdu_length, 0 /* BB other flags? */);
389
390 if (server->tcpStatus == CifsExiting) {
391 break;
392 } else if (server->tcpStatus == CifsNeedReconnect) {
393 cFYI(1, ("Reconnect after server stopped responding"));
394 cifs_reconnect(server);
395 cFYI(1, ("call to reconnect done"));
396 csocket = server->ssocket;
397 continue;
398 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
399 msleep(1); /* minimum sleep to prevent looping
400 allowing socket to clear and app threads to set
401 tcpStatus CifsNeedReconnect if server hung */
402 if (pdu_length < 4) {
403 iov.iov_base = (4 - pdu_length) +
404 (char *)smb_buffer;
405 iov.iov_len = pdu_length;
406 smb_msg.msg_control = NULL;
407 smb_msg.msg_controllen = 0;
408 goto incomplete_rcv;
409 } else
410 continue;
411 } else if (length <= 0) {
412 if (server->tcpStatus == CifsNew) {
413 cFYI(1, ("tcp session abend after SMBnegprot"));
414 /* some servers kill the TCP session rather than
415 returning an SMB negprot error, in which
416 case reconnecting here is not going to help,
417 and so simply return error to mount */
418 break;
419 }
420 if (!try_to_freeze() && (length == -EINTR)) {
421 cFYI(1, ("cifsd thread killed"));
422 break;
423 }
424 cFYI(1, ("Reconnect after unexpected peek error %d",
425 length));
426 cifs_reconnect(server);
427 csocket = server->ssocket;
428 wake_up(&server->response_q);
429 continue;
430 } else if (length < pdu_length) {
431 cFYI(1, ("requested %d bytes but only got %d bytes",
432 pdu_length, length));
433 pdu_length -= length;
434 msleep(1);
435 goto incomplete_rcv;
436 }
437
438 /* The right amount was read from socket - 4 bytes */
439 /* so we can now interpret the length field */
440
441 /* the first byte big endian of the length field,
442 is actually not part of the length but the type
443 with the most common, zero, as regular data */
444 temp = *((char *) smb_buffer);
445
446 /* Note that FC 1001 length is big endian on the wire,
447 but we convert it here so it is always manipulated
448 as host byte order */
449 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
450 smb_buffer->smb_buf_length = pdu_length;
451
452 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
453
454 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
455 continue;
456 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
457 cFYI(1, ("Good RFC 1002 session rsp"));
458 continue;
459 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
460 /* we get this from Windows 98 instead of
461 an error on SMB negprot response */
462 cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
463 pdu_length));
464 if (server->tcpStatus == CifsNew) {
465 /* if nack on negprot (rather than
466 ret of smb negprot error) reconnecting
467 not going to help, ret error to mount */
468 break;
469 } else {
470 /* give server a second to
471 clean up before reconnect attempt */
472 msleep(1000);
473 /* always try 445 first on reconnect
474 since we get NACK on some if we ever
475 connected to port 139 (the NACK is
476 since we do not begin with RFC1001
477 session initialize frame) */
478 server->addr.sockAddr.sin_port =
479 htons(CIFS_PORT);
480 cifs_reconnect(server);
481 csocket = server->ssocket;
482 wake_up(&server->response_q);
483 continue;
484 }
485 } else if (temp != (char) 0) {
486 cERROR(1, ("Unknown RFC 1002 frame"));
487 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
488 length);
489 cifs_reconnect(server);
490 csocket = server->ssocket;
491 continue;
492 }
493
494 /* else we have an SMB response */
495 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
496 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
497 cERROR(1, ("Invalid size SMB length %d pdu_length %d",
498 length, pdu_length+4));
499 cifs_reconnect(server);
500 csocket = server->ssocket;
501 wake_up(&server->response_q);
502 continue;
503 }
504
505 /* else length ok */
506 reconnect = 0;
507
508 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
509 isLargeBuf = true;
510 memcpy(bigbuf, smallbuf, 4);
511 smb_buffer = bigbuf;
512 }
513 length = 0;
514 iov.iov_base = 4 + (char *)smb_buffer;
515 iov.iov_len = pdu_length;
516 for (total_read = 0; total_read < pdu_length;
517 total_read += length) {
518 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
519 pdu_length - total_read, 0);
520 if ((server->tcpStatus == CifsExiting) ||
521 (length == -EINTR)) {
522 /* then will exit */
523 reconnect = 2;
524 break;
525 } else if (server->tcpStatus == CifsNeedReconnect) {
526 cifs_reconnect(server);
527 csocket = server->ssocket;
528 /* Reconnect wakes up rspns q */
529 /* Now we will reread sock */
530 reconnect = 1;
531 break;
532 } else if ((length == -ERESTARTSYS) ||
533 (length == -EAGAIN)) {
534 msleep(1); /* minimum sleep to prevent looping,
535 allowing socket to clear and app
536 threads to set tcpStatus
537 CifsNeedReconnect if server hung*/
538 length = 0;
539 continue;
540 } else if (length <= 0) {
541 cERROR(1, ("Received no data, expecting %d",
542 pdu_length - total_read));
543 cifs_reconnect(server);
544 csocket = server->ssocket;
545 reconnect = 1;
546 break;
547 }
548 }
549 if (reconnect == 2)
550 break;
551 else if (reconnect == 1)
552 continue;
553
554 length += 4; /* account for rfc1002 hdr */
555
556
557 dump_smb(smb_buffer, length);
558 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
559 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
560 continue;
561 }
562
563
564 task_to_wake = NULL;
565 spin_lock(&GlobalMid_Lock);
566 list_for_each(tmp, &server->pending_mid_q) {
567 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
568
569 if ((mid_entry->mid == smb_buffer->Mid) &&
570 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
571 (mid_entry->command == smb_buffer->Command)) {
572 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
573 /* We have a multipart transact2 resp */
574 isMultiRsp = true;
575 if (mid_entry->resp_buf) {
576 /* merge response - fix up 1st*/
577 if (coalesce_t2(smb_buffer,
578 mid_entry->resp_buf)) {
579 mid_entry->multiRsp =
580 true;
581 break;
582 } else {
583 /* all parts received */
584 mid_entry->multiEnd =
585 true;
586 goto multi_t2_fnd;
587 }
588 } else {
589 if (!isLargeBuf) {
590 cERROR(1,("1st trans2 resp needs bigbuf"));
591 /* BB maybe we can fix this up, switch
592 to already allocated large buffer? */
593 } else {
594 /* Have first buffer */
595 mid_entry->resp_buf =
596 smb_buffer;
597 mid_entry->largeBuf =
598 true;
599 bigbuf = NULL;
600 }
601 }
602 break;
603 }
604 mid_entry->resp_buf = smb_buffer;
605 mid_entry->largeBuf = isLargeBuf;
606 multi_t2_fnd:
607 task_to_wake = mid_entry->tsk;
608 mid_entry->midState = MID_RESPONSE_RECEIVED;
609 #ifdef CONFIG_CIFS_STATS2
610 mid_entry->when_received = jiffies;
611 #endif
612 /* so we do not time out requests to server
613 which is still responding (since server could
614 be busy but not dead) */
615 server->lstrp = jiffies;
616 break;
617 }
618 }
619 spin_unlock(&GlobalMid_Lock);
620 if (task_to_wake) {
621 /* Was previous buf put in mpx struct for multi-rsp? */
622 if (!isMultiRsp) {
623 /* smb buffer will be freed by user thread */
624 if (isLargeBuf)
625 bigbuf = NULL;
626 else
627 smallbuf = NULL;
628 }
629 wake_up_process(task_to_wake);
630 } else if (!is_valid_oplock_break(smb_buffer, server) &&
631 !isMultiRsp) {
632 cERROR(1, ("No task to wake, unknown frame received! "
633 "NumMids %d", midCount.counter));
634 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
635 sizeof(struct smb_hdr));
636 #ifdef CONFIG_CIFS_DEBUG2
637 cifs_dump_detail(smb_buffer);
638 cifs_dump_mids(server);
639 #endif /* CIFS_DEBUG2 */
640
641 }
642 } /* end while !EXITING */
643
644 /* take it off the list, if it's not already */
645 write_lock(&cifs_tcp_ses_lock);
646 list_del_init(&server->tcp_ses_list);
647 write_unlock(&cifs_tcp_ses_lock);
648
649 spin_lock(&GlobalMid_Lock);
650 server->tcpStatus = CifsExiting;
651 spin_unlock(&GlobalMid_Lock);
652 wake_up_all(&server->response_q);
653
654 /* check if we have blocked requests that need to free */
655 /* Note that cifs_max_pending is normally 50, but
656 can be set at module install time to as little as two */
657 spin_lock(&GlobalMid_Lock);
658 if (atomic_read(&server->inFlight) >= cifs_max_pending)
659 atomic_set(&server->inFlight, cifs_max_pending - 1);
660 /* We do not want to set the max_pending too low or we
661 could end up with the counter going negative */
662 spin_unlock(&GlobalMid_Lock);
663 /* Although there should not be any requests blocked on
664 this queue it can not hurt to be paranoid and try to wake up requests
665 that may haven been blocked when more than 50 at time were on the wire
666 to the same server - they now will see the session is in exit state
667 and get out of SendReceive. */
668 wake_up_all(&server->request_q);
669 /* give those requests time to exit */
670 msleep(125);
671
672 if (server->ssocket) {
673 sock_release(csocket);
674 server->ssocket = NULL;
675 }
676 /* buffer usuallly freed in free_mid - need to free it here on exit */
677 cifs_buf_release(bigbuf);
678 if (smallbuf) /* no sense logging a debug message if NULL */
679 cifs_small_buf_release(smallbuf);
680
681 /*
682 * BB: we shouldn't have to do any of this. It shouldn't be
683 * possible to exit from the thread with active SMB sessions
684 */
685 read_lock(&cifs_tcp_ses_lock);
686 if (list_empty(&server->pending_mid_q)) {
687 /* loop through server session structures attached to this and
688 mark them dead */
689 list_for_each(tmp, &server->smb_ses_list) {
690 ses = list_entry(tmp, struct cifsSesInfo,
691 smb_ses_list);
692 ses->status = CifsExiting;
693 ses->server = NULL;
694 }
695 read_unlock(&cifs_tcp_ses_lock);
696 } else {
697 /* although we can not zero the server struct pointer yet,
698 since there are active requests which may depnd on them,
699 mark the corresponding SMB sessions as exiting too */
700 list_for_each(tmp, &server->smb_ses_list) {
701 ses = list_entry(tmp, struct cifsSesInfo,
702 smb_ses_list);
703 ses->status = CifsExiting;
704 }
705
706 spin_lock(&GlobalMid_Lock);
707 list_for_each(tmp, &server->pending_mid_q) {
708 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
709 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
710 cFYI(1, ("Clearing Mid 0x%x - waking up ",
711 mid_entry->mid));
712 task_to_wake = mid_entry->tsk;
713 if (task_to_wake)
714 wake_up_process(task_to_wake);
715 }
716 }
717 spin_unlock(&GlobalMid_Lock);
718 read_unlock(&cifs_tcp_ses_lock);
719 /* 1/8th of sec is more than enough time for them to exit */
720 msleep(125);
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 /* mpx threads have not exited yet give them
725 at least the smb send timeout time for long ops */
726 /* due to delays on oplock break requests, we need
727 to wait at least 45 seconds before giving up
728 on a request getting a response and going ahead
729 and killing cifsd */
730 cFYI(1, ("Wait for exit from demultiplex thread"));
731 msleep(46000);
732 /* if threads still have not exited they are probably never
733 coming home not much else we can do but free the memory */
734 }
735
736 /* last chance to mark ses pointers invalid
737 if there are any pointing to this (e.g
738 if a crazy root user tried to kill cifsd
739 kernel thread explicitly this might happen) */
740 /* BB: This shouldn't be necessary, see above */
741 read_lock(&cifs_tcp_ses_lock);
742 list_for_each(tmp, &server->smb_ses_list) {
743 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
744 ses->server = NULL;
745 }
746 read_unlock(&cifs_tcp_ses_lock);
747
748 kfree(server->hostname);
749 task_to_wake = xchg(&server->tsk, NULL);
750 kfree(server);
751
752 length = atomic_dec_return(&tcpSesAllocCount);
753 if (length > 0)
754 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
755 GFP_KERNEL);
756
757 /* if server->tsk was NULL then wait for a signal before exiting */
758 if (!task_to_wake) {
759 set_current_state(TASK_INTERRUPTIBLE);
760 while (!signal_pending(current)) {
761 schedule();
762 set_current_state(TASK_INTERRUPTIBLE);
763 }
764 set_current_state(TASK_RUNNING);
765 }
766
767 module_put_and_exit(0);
768 }
769
770 /* extract the host portion of the UNC string */
771 static char *
772 extract_hostname(const char *unc)
773 {
774 const char *src;
775 char *dst, *delim;
776 unsigned int len;
777
778 /* skip double chars at beginning of string */
779 /* BB: check validity of these bytes? */
780 src = unc + 2;
781
782 /* delimiter between hostname and sharename is always '\\' now */
783 delim = strchr(src, '\\');
784 if (!delim)
785 return ERR_PTR(-EINVAL);
786
787 len = delim - src;
788 dst = kmalloc((len + 1), GFP_KERNEL);
789 if (dst == NULL)
790 return ERR_PTR(-ENOMEM);
791
792 memcpy(dst, src, len);
793 dst[len] = '\0';
794
795 return dst;
796 }
797
798 static int
799 cifs_parse_mount_options(char *options, const char *devname,
800 struct smb_vol *vol)
801 {
802 char *value;
803 char *data;
804 unsigned int temp_len, i, j;
805 char separator[2];
806 short int override_uid = -1;
807 short int override_gid = -1;
808 bool uid_specified = false;
809 bool gid_specified = false;
810
811 separator[0] = ',';
812 separator[1] = 0;
813
814 if (Local_System_Name[0] != 0)
815 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
816 else {
817 char *nodename = utsname()->nodename;
818 int n = strnlen(nodename, 15);
819 memset(vol->source_rfc1001_name, 0x20, 15);
820 for (i = 0; i < n; i++) {
821 /* does not have to be perfect mapping since field is
822 informational, only used for servers that do not support
823 port 445 and it can be overridden at mount time */
824 vol->source_rfc1001_name[i] = toupper(nodename[i]);
825 }
826 }
827 vol->source_rfc1001_name[15] = 0;
828 /* null target name indicates to use *SMBSERVR default called name
829 if we end up sending RFC1001 session initialize */
830 vol->target_rfc1001_name[0] = 0;
831 vol->linux_uid = current_uid(); /* use current_euid() instead? */
832 vol->linux_gid = current_gid();
833
834 /* default to only allowing write access to owner of the mount */
835 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
836
837 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
838 /* default is always to request posix paths. */
839 vol->posix_paths = 1;
840 /* default to using server inode numbers where available */
841 vol->server_ino = 1;
842
843 if (!options)
844 return 1;
845
846 if (strncmp(options, "sep=", 4) == 0) {
847 if (options[4] != 0) {
848 separator[0] = options[4];
849 options += 5;
850 } else {
851 cFYI(1, ("Null separator not allowed"));
852 }
853 }
854
855 while ((data = strsep(&options, separator)) != NULL) {
856 if (!*data)
857 continue;
858 if ((value = strchr(data, '=')) != NULL)
859 *value++ = '\0';
860
861 /* Have to parse this before we parse for "user" */
862 if (strnicmp(data, "user_xattr", 10) == 0) {
863 vol->no_xattr = 0;
864 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
865 vol->no_xattr = 1;
866 } else if (strnicmp(data, "user", 4) == 0) {
867 if (!value) {
868 printk(KERN_WARNING
869 "CIFS: invalid or missing username\n");
870 return 1; /* needs_arg; */
871 } else if (!*value) {
872 /* null user, ie anonymous, authentication */
873 vol->nullauth = 1;
874 }
875 if (strnlen(value, 200) < 200) {
876 vol->username = value;
877 } else {
878 printk(KERN_WARNING "CIFS: username too long\n");
879 return 1;
880 }
881 } else if (strnicmp(data, "pass", 4) == 0) {
882 if (!value) {
883 vol->password = NULL;
884 continue;
885 } else if (value[0] == 0) {
886 /* check if string begins with double comma
887 since that would mean the password really
888 does start with a comma, and would not
889 indicate an empty string */
890 if (value[1] != separator[0]) {
891 vol->password = NULL;
892 continue;
893 }
894 }
895 temp_len = strlen(value);
896 /* removed password length check, NTLM passwords
897 can be arbitrarily long */
898
899 /* if comma in password, the string will be
900 prematurely null terminated. Commas in password are
901 specified across the cifs mount interface by a double
902 comma ie ,, and a comma used as in other cases ie ','
903 as a parameter delimiter/separator is single and due
904 to the strsep above is temporarily zeroed. */
905
906 /* NB: password legally can have multiple commas and
907 the only illegal character in a password is null */
908
909 if ((value[temp_len] == 0) &&
910 (value[temp_len+1] == separator[0])) {
911 /* reinsert comma */
912 value[temp_len] = separator[0];
913 temp_len += 2; /* move after second comma */
914 while (value[temp_len] != 0) {
915 if (value[temp_len] == separator[0]) {
916 if (value[temp_len+1] ==
917 separator[0]) {
918 /* skip second comma */
919 temp_len++;
920 } else {
921 /* single comma indicating start
922 of next parm */
923 break;
924 }
925 }
926 temp_len++;
927 }
928 if (value[temp_len] == 0) {
929 options = NULL;
930 } else {
931 value[temp_len] = 0;
932 /* point option to start of next parm */
933 options = value + temp_len + 1;
934 }
935 /* go from value to value + temp_len condensing
936 double commas to singles. Note that this ends up
937 allocating a few bytes too many, which is ok */
938 vol->password = kzalloc(temp_len, GFP_KERNEL);
939 if (vol->password == NULL) {
940 printk(KERN_WARNING "CIFS: no memory "
941 "for password\n");
942 return 1;
943 }
944 for (i = 0, j = 0; i < temp_len; i++, j++) {
945 vol->password[j] = value[i];
946 if (value[i] == separator[0]
947 && value[i+1] == separator[0]) {
948 /* skip second comma */
949 i++;
950 }
951 }
952 vol->password[j] = 0;
953 } else {
954 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
955 if (vol->password == NULL) {
956 printk(KERN_WARNING "CIFS: no memory "
957 "for password\n");
958 return 1;
959 }
960 strcpy(vol->password, value);
961 }
962 } else if (!strnicmp(data, "ip", 2) ||
963 !strnicmp(data, "addr", 4)) {
964 if (!value || !*value) {
965 vol->UNCip = NULL;
966 } else if (strnlen(value, INET6_ADDRSTRLEN) <
967 INET6_ADDRSTRLEN) {
968 vol->UNCip = value;
969 } else {
970 printk(KERN_WARNING "CIFS: ip address "
971 "too long\n");
972 return 1;
973 }
974 } else if (strnicmp(data, "sec", 3) == 0) {
975 if (!value || !*value) {
976 cERROR(1, ("no security value specified"));
977 continue;
978 } else if (strnicmp(value, "krb5i", 5) == 0) {
979 vol->secFlg |= CIFSSEC_MAY_KRB5 |
980 CIFSSEC_MUST_SIGN;
981 } else if (strnicmp(value, "krb5p", 5) == 0) {
982 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
983 CIFSSEC_MAY_KRB5; */
984 cERROR(1, ("Krb5 cifs privacy not supported"));
985 return 1;
986 } else if (strnicmp(value, "krb5", 4) == 0) {
987 vol->secFlg |= CIFSSEC_MAY_KRB5;
988 #ifdef CONFIG_CIFS_EXPERIMENTAL
989 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
990 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
991 CIFSSEC_MUST_SIGN;
992 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
993 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
994 #endif
995 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
996 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
997 CIFSSEC_MUST_SIGN;
998 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1000 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1001 vol->secFlg |= CIFSSEC_MAY_NTLM |
1002 CIFSSEC_MUST_SIGN;
1003 } else if (strnicmp(value, "ntlm", 4) == 0) {
1004 /* ntlm is default so can be turned off too */
1005 vol->secFlg |= CIFSSEC_MAY_NTLM;
1006 } else if (strnicmp(value, "nontlm", 6) == 0) {
1007 /* BB is there a better way to do this? */
1008 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1009 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1010 } else if (strnicmp(value, "lanman", 6) == 0) {
1011 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1012 #endif
1013 } else if (strnicmp(value, "none", 4) == 0) {
1014 vol->nullauth = 1;
1015 } else {
1016 cERROR(1, ("bad security option: %s", value));
1017 return 1;
1018 }
1019 } else if ((strnicmp(data, "unc", 3) == 0)
1020 || (strnicmp(data, "target", 6) == 0)
1021 || (strnicmp(data, "path", 4) == 0)) {
1022 if (!value || !*value) {
1023 printk(KERN_WARNING "CIFS: invalid path to "
1024 "network resource\n");
1025 return 1; /* needs_arg; */
1026 }
1027 if ((temp_len = strnlen(value, 300)) < 300) {
1028 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1029 if (vol->UNC == NULL)
1030 return 1;
1031 strcpy(vol->UNC, value);
1032 if (strncmp(vol->UNC, "//", 2) == 0) {
1033 vol->UNC[0] = '\\';
1034 vol->UNC[1] = '\\';
1035 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1036 printk(KERN_WARNING
1037 "CIFS: UNC Path does not begin "
1038 "with // or \\\\ \n");
1039 return 1;
1040 }
1041 } else {
1042 printk(KERN_WARNING "CIFS: UNC name too long\n");
1043 return 1;
1044 }
1045 } else if ((strnicmp(data, "domain", 3) == 0)
1046 || (strnicmp(data, "workgroup", 5) == 0)) {
1047 if (!value || !*value) {
1048 printk(KERN_WARNING "CIFS: invalid domain name\n");
1049 return 1; /* needs_arg; */
1050 }
1051 /* BB are there cases in which a comma can be valid in
1052 a domain name and need special handling? */
1053 if (strnlen(value, 256) < 256) {
1054 vol->domainname = value;
1055 cFYI(1, ("Domain name set"));
1056 } else {
1057 printk(KERN_WARNING "CIFS: domain name too "
1058 "long\n");
1059 return 1;
1060 }
1061 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1062 if (!value || !*value) {
1063 printk(KERN_WARNING
1064 "CIFS: invalid path prefix\n");
1065 return 1; /* needs_argument */
1066 }
1067 if ((temp_len = strnlen(value, 1024)) < 1024) {
1068 if (value[0] != '/')
1069 temp_len++; /* missing leading slash */
1070 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1071 if (vol->prepath == NULL)
1072 return 1;
1073 if (value[0] != '/') {
1074 vol->prepath[0] = '/';
1075 strcpy(vol->prepath+1, value);
1076 } else
1077 strcpy(vol->prepath, value);
1078 cFYI(1, ("prefix path %s", vol->prepath));
1079 } else {
1080 printk(KERN_WARNING "CIFS: prefix too long\n");
1081 return 1;
1082 }
1083 } else if (strnicmp(data, "iocharset", 9) == 0) {
1084 if (!value || !*value) {
1085 printk(KERN_WARNING "CIFS: invalid iocharset "
1086 "specified\n");
1087 return 1; /* needs_arg; */
1088 }
1089 if (strnlen(value, 65) < 65) {
1090 if (strnicmp(value, "default", 7))
1091 vol->iocharset = value;
1092 /* if iocharset not set then load_nls_default
1093 is used by caller */
1094 cFYI(1, ("iocharset set to %s", value));
1095 } else {
1096 printk(KERN_WARNING "CIFS: iocharset name "
1097 "too long.\n");
1098 return 1;
1099 }
1100 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1101 vol->linux_uid = simple_strtoul(value, &value, 0);
1102 uid_specified = true;
1103 } else if (!strnicmp(data, "forceuid", 8)) {
1104 override_uid = 1;
1105 } else if (!strnicmp(data, "noforceuid", 10)) {
1106 override_uid = 0;
1107 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1108 vol->linux_gid = simple_strtoul(value, &value, 0);
1109 gid_specified = true;
1110 } else if (!strnicmp(data, "forcegid", 8)) {
1111 override_gid = 1;
1112 } else if (!strnicmp(data, "noforcegid", 10)) {
1113 override_gid = 0;
1114 } else if (strnicmp(data, "file_mode", 4) == 0) {
1115 if (value && *value) {
1116 vol->file_mode =
1117 simple_strtoul(value, &value, 0);
1118 }
1119 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1120 if (value && *value) {
1121 vol->dir_mode =
1122 simple_strtoul(value, &value, 0);
1123 }
1124 } else if (strnicmp(data, "dirmode", 4) == 0) {
1125 if (value && *value) {
1126 vol->dir_mode =
1127 simple_strtoul(value, &value, 0);
1128 }
1129 } else if (strnicmp(data, "port", 4) == 0) {
1130 if (value && *value) {
1131 vol->port =
1132 simple_strtoul(value, &value, 0);
1133 }
1134 } else if (strnicmp(data, "rsize", 5) == 0) {
1135 if (value && *value) {
1136 vol->rsize =
1137 simple_strtoul(value, &value, 0);
1138 }
1139 } else if (strnicmp(data, "wsize", 5) == 0) {
1140 if (value && *value) {
1141 vol->wsize =
1142 simple_strtoul(value, &value, 0);
1143 }
1144 } else if (strnicmp(data, "sockopt", 5) == 0) {
1145 if (value && *value) {
1146 vol->sockopt =
1147 simple_strtoul(value, &value, 0);
1148 }
1149 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1150 if (!value || !*value || (*value == ' ')) {
1151 cFYI(1, ("invalid (empty) netbiosname"));
1152 } else {
1153 memset(vol->source_rfc1001_name, 0x20, 15);
1154 for (i = 0; i < 15; i++) {
1155 /* BB are there cases in which a comma can be
1156 valid in this workstation netbios name (and need
1157 special handling)? */
1158
1159 /* We do not uppercase netbiosname for user */
1160 if (value[i] == 0)
1161 break;
1162 else
1163 vol->source_rfc1001_name[i] =
1164 value[i];
1165 }
1166 /* The string has 16th byte zero still from
1167 set at top of the function */
1168 if ((i == 15) && (value[i] != 0))
1169 printk(KERN_WARNING "CIFS: netbiosname"
1170 " longer than 15 truncated.\n");
1171 }
1172 } else if (strnicmp(data, "servern", 7) == 0) {
1173 /* servernetbiosname specified override *SMBSERVER */
1174 if (!value || !*value || (*value == ' ')) {
1175 cFYI(1, ("empty server netbiosname specified"));
1176 } else {
1177 /* last byte, type, is 0x20 for servr type */
1178 memset(vol->target_rfc1001_name, 0x20, 16);
1179
1180 for (i = 0; i < 15; i++) {
1181 /* BB are there cases in which a comma can be
1182 valid in this workstation netbios name
1183 (and need special handling)? */
1184
1185 /* user or mount helper must uppercase
1186 the netbiosname */
1187 if (value[i] == 0)
1188 break;
1189 else
1190 vol->target_rfc1001_name[i] =
1191 value[i];
1192 }
1193 /* The string has 16th byte zero still from
1194 set at top of the function */
1195 if ((i == 15) && (value[i] != 0))
1196 printk(KERN_WARNING "CIFS: server net"
1197 "biosname longer than 15 truncated.\n");
1198 }
1199 } else if (strnicmp(data, "credentials", 4) == 0) {
1200 /* ignore */
1201 } else if (strnicmp(data, "version", 3) == 0) {
1202 /* ignore */
1203 } else if (strnicmp(data, "guest", 5) == 0) {
1204 /* ignore */
1205 } else if (strnicmp(data, "rw", 2) == 0) {
1206 /* ignore */
1207 } else if (strnicmp(data, "ro", 2) == 0) {
1208 /* ignore */
1209 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1210 vol->noblocksnd = 1;
1211 } else if (strnicmp(data, "noautotune", 10) == 0) {
1212 vol->noautotune = 1;
1213 } else if ((strnicmp(data, "suid", 4) == 0) ||
1214 (strnicmp(data, "nosuid", 6) == 0) ||
1215 (strnicmp(data, "exec", 4) == 0) ||
1216 (strnicmp(data, "noexec", 6) == 0) ||
1217 (strnicmp(data, "nodev", 5) == 0) ||
1218 (strnicmp(data, "noauto", 6) == 0) ||
1219 (strnicmp(data, "dev", 3) == 0)) {
1220 /* The mount tool or mount.cifs helper (if present)
1221 uses these opts to set flags, and the flags are read
1222 by the kernel vfs layer before we get here (ie
1223 before read super) so there is no point trying to
1224 parse these options again and set anything and it
1225 is ok to just ignore them */
1226 continue;
1227 } else if (strnicmp(data, "hard", 4) == 0) {
1228 vol->retry = 1;
1229 } else if (strnicmp(data, "soft", 4) == 0) {
1230 vol->retry = 0;
1231 } else if (strnicmp(data, "perm", 4) == 0) {
1232 vol->noperm = 0;
1233 } else if (strnicmp(data, "noperm", 6) == 0) {
1234 vol->noperm = 1;
1235 } else if (strnicmp(data, "mapchars", 8) == 0) {
1236 vol->remap = 1;
1237 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1238 vol->remap = 0;
1239 } else if (strnicmp(data, "sfu", 3) == 0) {
1240 vol->sfu_emul = 1;
1241 } else if (strnicmp(data, "nosfu", 5) == 0) {
1242 vol->sfu_emul = 0;
1243 } else if (strnicmp(data, "nodfs", 5) == 0) {
1244 vol->nodfs = 1;
1245 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1246 vol->posix_paths = 1;
1247 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1248 vol->posix_paths = 0;
1249 } else if (strnicmp(data, "nounix", 6) == 0) {
1250 vol->no_linux_ext = 1;
1251 } else if (strnicmp(data, "nolinux", 7) == 0) {
1252 vol->no_linux_ext = 1;
1253 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1254 (strnicmp(data, "ignorecase", 10) == 0)) {
1255 vol->nocase = 1;
1256 } else if (strnicmp(data, "brl", 3) == 0) {
1257 vol->nobrl = 0;
1258 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1259 (strnicmp(data, "nolock", 6) == 0)) {
1260 vol->nobrl = 1;
1261 /* turn off mandatory locking in mode
1262 if remote locking is turned off since the
1263 local vfs will do advisory */
1264 if (vol->file_mode ==
1265 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1266 vol->file_mode = S_IALLUGO;
1267 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1268 /* will take the shorter form "forcemand" as well */
1269 /* This mount option will force use of mandatory
1270 (DOS/Windows style) byte range locks, instead of
1271 using posix advisory byte range locks, even if the
1272 Unix extensions are available and posix locks would
1273 be supported otherwise. If Unix extensions are not
1274 negotiated this has no effect since mandatory locks
1275 would be used (mandatory locks is all that those
1276 those servers support) */
1277 vol->mand_lock = 1;
1278 } else if (strnicmp(data, "setuids", 7) == 0) {
1279 vol->setuids = 1;
1280 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1281 vol->setuids = 0;
1282 } else if (strnicmp(data, "dynperm", 7) == 0) {
1283 vol->dynperm = true;
1284 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1285 vol->dynperm = false;
1286 } else if (strnicmp(data, "nohard", 6) == 0) {
1287 vol->retry = 0;
1288 } else if (strnicmp(data, "nosoft", 6) == 0) {
1289 vol->retry = 1;
1290 } else if (strnicmp(data, "nointr", 6) == 0) {
1291 vol->intr = 0;
1292 } else if (strnicmp(data, "intr", 4) == 0) {
1293 vol->intr = 1;
1294 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1295 vol->nostrictsync = 1;
1296 } else if (strnicmp(data, "strictsync", 10) == 0) {
1297 vol->nostrictsync = 0;
1298 } else if (strnicmp(data, "serverino", 7) == 0) {
1299 vol->server_ino = 1;
1300 } else if (strnicmp(data, "noserverino", 9) == 0) {
1301 vol->server_ino = 0;
1302 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1303 vol->cifs_acl = 1;
1304 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1305 vol->cifs_acl = 0;
1306 } else if (strnicmp(data, "acl", 3) == 0) {
1307 vol->no_psx_acl = 0;
1308 } else if (strnicmp(data, "noacl", 5) == 0) {
1309 vol->no_psx_acl = 1;
1310 #ifdef CONFIG_CIFS_EXPERIMENTAL
1311 } else if (strnicmp(data, "locallease", 6) == 0) {
1312 vol->local_lease = 1;
1313 #endif
1314 } else if (strnicmp(data, "sign", 4) == 0) {
1315 vol->secFlg |= CIFSSEC_MUST_SIGN;
1316 } else if (strnicmp(data, "seal", 4) == 0) {
1317 /* we do not do the following in secFlags because seal
1318 is a per tree connection (mount) not a per socket
1319 or per-smb connection option in the protocol */
1320 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1321 vol->seal = 1;
1322 } else if (strnicmp(data, "direct", 6) == 0) {
1323 vol->direct_io = 1;
1324 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1325 vol->direct_io = 1;
1326 } else if (strnicmp(data, "noac", 4) == 0) {
1327 printk(KERN_WARNING "CIFS: Mount option noac not "
1328 "supported. Instead set "
1329 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1330 } else
1331 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1332 data);
1333 }
1334 if (vol->UNC == NULL) {
1335 if (devname == NULL) {
1336 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1337 "target\n");
1338 return 1;
1339 }
1340 if ((temp_len = strnlen(devname, 300)) < 300) {
1341 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1342 if (vol->UNC == NULL)
1343 return 1;
1344 strcpy(vol->UNC, devname);
1345 if (strncmp(vol->UNC, "//", 2) == 0) {
1346 vol->UNC[0] = '\\';
1347 vol->UNC[1] = '\\';
1348 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1349 printk(KERN_WARNING "CIFS: UNC Path does not "
1350 "begin with // or \\\\ \n");
1351 return 1;
1352 }
1353 value = strpbrk(vol->UNC+2, "/\\");
1354 if (value)
1355 *value = '\\';
1356 } else {
1357 printk(KERN_WARNING "CIFS: UNC name too long\n");
1358 return 1;
1359 }
1360 }
1361 if (vol->UNCip == NULL)
1362 vol->UNCip = &vol->UNC[2];
1363
1364 if (uid_specified)
1365 vol->override_uid = override_uid;
1366 else if (override_uid == 1)
1367 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1368 "specified with no uid= option.\n");
1369
1370 if (gid_specified)
1371 vol->override_gid = override_gid;
1372 else if (override_gid == 1)
1373 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1374 "specified with no gid= option.\n");
1375
1376 return 0;
1377 }
1378
1379 static struct TCP_Server_Info *
1380 cifs_find_tcp_session(struct sockaddr_storage *addr)
1381 {
1382 struct list_head *tmp;
1383 struct TCP_Server_Info *server;
1384 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1385 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1386
1387 write_lock(&cifs_tcp_ses_lock);
1388 list_for_each(tmp, &cifs_tcp_ses_list) {
1389 server = list_entry(tmp, struct TCP_Server_Info,
1390 tcp_ses_list);
1391 /*
1392 * the demux thread can exit on its own while still in CifsNew
1393 * so don't accept any sockets in that state. Since the
1394 * tcpStatus never changes back to CifsNew it's safe to check
1395 * for this without a lock.
1396 */
1397 if (server->tcpStatus == CifsNew)
1398 continue;
1399
1400 if (addr->ss_family == AF_INET &&
1401 (addr4->sin_addr.s_addr !=
1402 server->addr.sockAddr.sin_addr.s_addr))
1403 continue;
1404 else if (addr->ss_family == AF_INET6 &&
1405 (!ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1406 &addr6->sin6_addr) ||
1407 server->addr.sockAddr6.sin6_scope_id !=
1408 addr6->sin6_scope_id))
1409 continue;
1410
1411 ++server->srv_count;
1412 write_unlock(&cifs_tcp_ses_lock);
1413 cFYI(1, ("Existing tcp session with server found"));
1414 return server;
1415 }
1416 write_unlock(&cifs_tcp_ses_lock);
1417 return NULL;
1418 }
1419
1420 static void
1421 cifs_put_tcp_session(struct TCP_Server_Info *server)
1422 {
1423 struct task_struct *task;
1424
1425 write_lock(&cifs_tcp_ses_lock);
1426 if (--server->srv_count > 0) {
1427 write_unlock(&cifs_tcp_ses_lock);
1428 return;
1429 }
1430
1431 list_del_init(&server->tcp_ses_list);
1432 write_unlock(&cifs_tcp_ses_lock);
1433
1434 spin_lock(&GlobalMid_Lock);
1435 server->tcpStatus = CifsExiting;
1436 spin_unlock(&GlobalMid_Lock);
1437
1438 task = xchg(&server->tsk, NULL);
1439 if (task)
1440 force_sig(SIGKILL, task);
1441 }
1442
1443 static struct TCP_Server_Info *
1444 cifs_get_tcp_session(struct smb_vol *volume_info)
1445 {
1446 struct TCP_Server_Info *tcp_ses = NULL;
1447 struct sockaddr_storage addr;
1448 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1449 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1450 int rc;
1451
1452 memset(&addr, 0, sizeof(struct sockaddr_storage));
1453
1454 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1455
1456 if (volume_info->UNCip && volume_info->UNC) {
1457 rc = cifs_convert_address(volume_info->UNCip, &addr);
1458 if (!rc) {
1459 /* we failed translating address */
1460 rc = -EINVAL;
1461 goto out_err;
1462 }
1463 } else if (volume_info->UNCip) {
1464 /* BB using ip addr as tcp_ses name to connect to the
1465 DFS root below */
1466 cERROR(1, ("Connecting to DFS root not implemented yet"));
1467 rc = -EINVAL;
1468 goto out_err;
1469 } else /* which tcp_sess DFS root would we conect to */ {
1470 cERROR(1,
1471 ("CIFS mount error: No UNC path (e.g. -o "
1472 "unc=//192.168.1.100/public) specified"));
1473 rc = -EINVAL;
1474 goto out_err;
1475 }
1476
1477 /* see if we already have a matching tcp_ses */
1478 tcp_ses = cifs_find_tcp_session(&addr);
1479 if (tcp_ses)
1480 return tcp_ses;
1481
1482 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1483 if (!tcp_ses) {
1484 rc = -ENOMEM;
1485 goto out_err;
1486 }
1487
1488 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1489 if (IS_ERR(tcp_ses->hostname)) {
1490 rc = PTR_ERR(tcp_ses->hostname);
1491 goto out_err;
1492 }
1493
1494 tcp_ses->noblocksnd = volume_info->noblocksnd;
1495 tcp_ses->noautotune = volume_info->noautotune;
1496 atomic_set(&tcp_ses->inFlight, 0);
1497 init_waitqueue_head(&tcp_ses->response_q);
1498 init_waitqueue_head(&tcp_ses->request_q);
1499 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1500 mutex_init(&tcp_ses->srv_mutex);
1501 memcpy(tcp_ses->workstation_RFC1001_name,
1502 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1503 memcpy(tcp_ses->server_RFC1001_name,
1504 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1505 tcp_ses->sequence_number = 0;
1506 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1507 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1508
1509 /*
1510 * at this point we are the only ones with the pointer
1511 * to the struct since the kernel thread not created yet
1512 * no need to spinlock this init of tcpStatus or srv_count
1513 */
1514 tcp_ses->tcpStatus = CifsNew;
1515 ++tcp_ses->srv_count;
1516
1517 if (addr.ss_family == AF_INET6) {
1518 cFYI(1, ("attempting ipv6 connect"));
1519 /* BB should we allow ipv6 on port 139? */
1520 /* other OS never observed in Wild doing 139 with v6 */
1521 sin_server6->sin6_port = htons(volume_info->port);
1522 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1523 sizeof(struct sockaddr_in6));
1524 rc = ipv6_connect(tcp_ses);
1525 } else {
1526 sin_server->sin_port = htons(volume_info->port);
1527 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1528 sizeof(struct sockaddr_in));
1529 rc = ipv4_connect(tcp_ses);
1530 }
1531 if (rc < 0) {
1532 cERROR(1, ("Error connecting to socket. Aborting operation"));
1533 goto out_err;
1534 }
1535
1536 /*
1537 * since we're in a cifs function already, we know that
1538 * this will succeed. No need for try_module_get().
1539 */
1540 __module_get(THIS_MODULE);
1541 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1542 tcp_ses, "cifsd");
1543 if (IS_ERR(tcp_ses->tsk)) {
1544 rc = PTR_ERR(tcp_ses->tsk);
1545 cERROR(1, ("error %d create cifsd thread", rc));
1546 module_put(THIS_MODULE);
1547 goto out_err;
1548 }
1549
1550 /* thread spawned, put it on the list */
1551 write_lock(&cifs_tcp_ses_lock);
1552 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1553 write_unlock(&cifs_tcp_ses_lock);
1554
1555 return tcp_ses;
1556
1557 out_err:
1558 if (tcp_ses) {
1559 kfree(tcp_ses->hostname);
1560 if (tcp_ses->ssocket)
1561 sock_release(tcp_ses->ssocket);
1562 kfree(tcp_ses);
1563 }
1564 return ERR_PTR(rc);
1565 }
1566
1567 static struct cifsSesInfo *
1568 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1569 {
1570 struct list_head *tmp;
1571 struct cifsSesInfo *ses;
1572
1573 write_lock(&cifs_tcp_ses_lock);
1574 list_for_each(tmp, &server->smb_ses_list) {
1575 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1576 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1577 continue;
1578
1579 ++ses->ses_count;
1580 write_unlock(&cifs_tcp_ses_lock);
1581 return ses;
1582 }
1583 write_unlock(&cifs_tcp_ses_lock);
1584 return NULL;
1585 }
1586
1587 static void
1588 cifs_put_smb_ses(struct cifsSesInfo *ses)
1589 {
1590 int xid;
1591 struct TCP_Server_Info *server = ses->server;
1592
1593 write_lock(&cifs_tcp_ses_lock);
1594 if (--ses->ses_count > 0) {
1595 write_unlock(&cifs_tcp_ses_lock);
1596 return;
1597 }
1598
1599 list_del_init(&ses->smb_ses_list);
1600 write_unlock(&cifs_tcp_ses_lock);
1601
1602 if (ses->status == CifsGood) {
1603 xid = GetXid();
1604 CIFSSMBLogoff(xid, ses);
1605 _FreeXid(xid);
1606 }
1607 sesInfoFree(ses);
1608 cifs_put_tcp_session(server);
1609 }
1610
1611 static struct cifsTconInfo *
1612 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1613 {
1614 struct list_head *tmp;
1615 struct cifsTconInfo *tcon;
1616
1617 write_lock(&cifs_tcp_ses_lock);
1618 list_for_each(tmp, &ses->tcon_list) {
1619 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1620 if (tcon->tidStatus == CifsExiting)
1621 continue;
1622 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1623 continue;
1624
1625 ++tcon->tc_count;
1626 write_unlock(&cifs_tcp_ses_lock);
1627 return tcon;
1628 }
1629 write_unlock(&cifs_tcp_ses_lock);
1630 return NULL;
1631 }
1632
1633 static void
1634 cifs_put_tcon(struct cifsTconInfo *tcon)
1635 {
1636 int xid;
1637 struct cifsSesInfo *ses = tcon->ses;
1638
1639 write_lock(&cifs_tcp_ses_lock);
1640 if (--tcon->tc_count > 0) {
1641 write_unlock(&cifs_tcp_ses_lock);
1642 return;
1643 }
1644
1645 list_del_init(&tcon->tcon_list);
1646 write_unlock(&cifs_tcp_ses_lock);
1647
1648 xid = GetXid();
1649 CIFSSMBTDis(xid, tcon);
1650 _FreeXid(xid);
1651
1652 DeleteTconOplockQEntries(tcon);
1653 tconInfoFree(tcon);
1654 cifs_put_smb_ses(ses);
1655 }
1656
1657 int
1658 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1659 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1660 struct dfs_info3_param **preferrals, int remap)
1661 {
1662 char *temp_unc;
1663 int rc = 0;
1664
1665 *pnum_referrals = 0;
1666 *preferrals = NULL;
1667
1668 if (pSesInfo->ipc_tid == 0) {
1669 temp_unc = kmalloc(2 /* for slashes */ +
1670 strnlen(pSesInfo->serverName,
1671 SERVER_NAME_LEN_WITH_NULL * 2)
1672 + 1 + 4 /* slash IPC$ */ + 2,
1673 GFP_KERNEL);
1674 if (temp_unc == NULL)
1675 return -ENOMEM;
1676 temp_unc[0] = '\\';
1677 temp_unc[1] = '\\';
1678 strcpy(temp_unc + 2, pSesInfo->serverName);
1679 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1680 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1681 cFYI(1,
1682 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1683 kfree(temp_unc);
1684 }
1685 if (rc == 0)
1686 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1687 pnum_referrals, nls_codepage, remap);
1688 /* BB map targetUNCs to dfs_info3 structures, here or
1689 in CIFSGetDFSRefer BB */
1690
1691 return rc;
1692 }
1693
1694 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1695 static struct lock_class_key cifs_key[2];
1696 static struct lock_class_key cifs_slock_key[2];
1697
1698 static inline void
1699 cifs_reclassify_socket4(struct socket *sock)
1700 {
1701 struct sock *sk = sock->sk;
1702 BUG_ON(sock_owned_by_user(sk));
1703 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1704 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1705 }
1706
1707 static inline void
1708 cifs_reclassify_socket6(struct socket *sock)
1709 {
1710 struct sock *sk = sock->sk;
1711 BUG_ON(sock_owned_by_user(sk));
1712 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1713 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1714 }
1715 #else
1716 static inline void
1717 cifs_reclassify_socket4(struct socket *sock)
1718 {
1719 }
1720
1721 static inline void
1722 cifs_reclassify_socket6(struct socket *sock)
1723 {
1724 }
1725 #endif
1726
1727 /* See RFC1001 section 14 on representation of Netbios names */
1728 static void rfc1002mangle(char *target, char *source, unsigned int length)
1729 {
1730 unsigned int i, j;
1731
1732 for (i = 0, j = 0; i < (length); i++) {
1733 /* mask a nibble at a time and encode */
1734 target[j] = 'A' + (0x0F & (source[i] >> 4));
1735 target[j+1] = 'A' + (0x0F & source[i]);
1736 j += 2;
1737 }
1738
1739 }
1740
1741
1742 static int
1743 ipv4_connect(struct TCP_Server_Info *server)
1744 {
1745 int rc = 0;
1746 bool connected = false;
1747 __be16 orig_port = 0;
1748 struct socket *socket = server->ssocket;
1749
1750 if (socket == NULL) {
1751 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1752 IPPROTO_TCP, &socket);
1753 if (rc < 0) {
1754 cERROR(1, ("Error %d creating socket", rc));
1755 return rc;
1756 }
1757
1758 /* BB other socket options to set KEEPALIVE, NODELAY? */
1759 cFYI(1, ("Socket created"));
1760 server->ssocket = socket;
1761 socket->sk->sk_allocation = GFP_NOFS;
1762 cifs_reclassify_socket4(socket);
1763 }
1764
1765 /* user overrode default port */
1766 if (server->addr.sockAddr.sin_port) {
1767 rc = socket->ops->connect(socket, (struct sockaddr *)
1768 &server->addr.sockAddr,
1769 sizeof(struct sockaddr_in), 0);
1770 if (rc >= 0)
1771 connected = true;
1772 }
1773
1774 if (!connected) {
1775 /* save original port so we can retry user specified port
1776 later if fall back ports fail this time */
1777 orig_port = server->addr.sockAddr.sin_port;
1778
1779 /* do not retry on the same port we just failed on */
1780 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1781 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1782 rc = socket->ops->connect(socket,
1783 (struct sockaddr *)
1784 &server->addr.sockAddr,
1785 sizeof(struct sockaddr_in), 0);
1786 if (rc >= 0)
1787 connected = true;
1788 }
1789 }
1790 if (!connected) {
1791 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1792 rc = socket->ops->connect(socket, (struct sockaddr *)
1793 &server->addr.sockAddr,
1794 sizeof(struct sockaddr_in), 0);
1795 if (rc >= 0)
1796 connected = true;
1797 }
1798
1799 /* give up here - unless we want to retry on different
1800 protocol families some day */
1801 if (!connected) {
1802 if (orig_port)
1803 server->addr.sockAddr.sin_port = orig_port;
1804 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1805 sock_release(socket);
1806 server->ssocket = NULL;
1807 return rc;
1808 }
1809
1810
1811 /*
1812 * Eventually check for other socket options to change from
1813 * the default. sock_setsockopt not used because it expects
1814 * user space buffer
1815 */
1816 socket->sk->sk_rcvtimeo = 7 * HZ;
1817 socket->sk->sk_sndtimeo = 5 * HZ;
1818
1819 /* make the bufsizes depend on wsize/rsize and max requests */
1820 if (server->noautotune) {
1821 if (socket->sk->sk_sndbuf < (200 * 1024))
1822 socket->sk->sk_sndbuf = 200 * 1024;
1823 if (socket->sk->sk_rcvbuf < (140 * 1024))
1824 socket->sk->sk_rcvbuf = 140 * 1024;
1825 }
1826
1827 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1828 socket->sk->sk_sndbuf,
1829 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1830
1831 /* send RFC1001 sessinit */
1832 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1833 /* some servers require RFC1001 sessinit before sending
1834 negprot - BB check reconnection in case where second
1835 sessinit is sent but no second negprot */
1836 struct rfc1002_session_packet *ses_init_buf;
1837 struct smb_hdr *smb_buf;
1838 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1839 GFP_KERNEL);
1840 if (ses_init_buf) {
1841 ses_init_buf->trailer.session_req.called_len = 32;
1842 if (server->server_RFC1001_name &&
1843 server->server_RFC1001_name[0] != 0)
1844 rfc1002mangle(ses_init_buf->trailer.
1845 session_req.called_name,
1846 server->server_RFC1001_name,
1847 RFC1001_NAME_LEN_WITH_NULL);
1848 else
1849 rfc1002mangle(ses_init_buf->trailer.
1850 session_req.called_name,
1851 DEFAULT_CIFS_CALLED_NAME,
1852 RFC1001_NAME_LEN_WITH_NULL);
1853
1854 ses_init_buf->trailer.session_req.calling_len = 32;
1855
1856 /* calling name ends in null (byte 16) from old smb
1857 convention. */
1858 if (server->workstation_RFC1001_name &&
1859 server->workstation_RFC1001_name[0] != 0)
1860 rfc1002mangle(ses_init_buf->trailer.
1861 session_req.calling_name,
1862 server->workstation_RFC1001_name,
1863 RFC1001_NAME_LEN_WITH_NULL);
1864 else
1865 rfc1002mangle(ses_init_buf->trailer.
1866 session_req.calling_name,
1867 "LINUX_CIFS_CLNT",
1868 RFC1001_NAME_LEN_WITH_NULL);
1869
1870 ses_init_buf->trailer.session_req.scope1 = 0;
1871 ses_init_buf->trailer.session_req.scope2 = 0;
1872 smb_buf = (struct smb_hdr *)ses_init_buf;
1873 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1874 smb_buf->smb_buf_length = 0x81000044;
1875 rc = smb_send(server, smb_buf, 0x44);
1876 kfree(ses_init_buf);
1877 msleep(1); /* RFC1001 layer in at least one server
1878 requires very short break before negprot
1879 presumably because not expecting negprot
1880 to follow so fast. This is a simple
1881 solution that works without
1882 complicating the code and causes no
1883 significant slowing down on mount
1884 for everyone else */
1885 }
1886 /* else the negprot may still work without this
1887 even though malloc failed */
1888
1889 }
1890
1891 return rc;
1892 }
1893
1894 static int
1895 ipv6_connect(struct TCP_Server_Info *server)
1896 {
1897 int rc = 0;
1898 bool connected = false;
1899 __be16 orig_port = 0;
1900 struct socket *socket = server->ssocket;
1901
1902 if (socket == NULL) {
1903 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1904 IPPROTO_TCP, &socket);
1905 if (rc < 0) {
1906 cERROR(1, ("Error %d creating ipv6 socket", rc));
1907 socket = NULL;
1908 return rc;
1909 }
1910
1911 /* BB other socket options to set KEEPALIVE, NODELAY? */
1912 cFYI(1, ("ipv6 Socket created"));
1913 server->ssocket = socket;
1914 socket->sk->sk_allocation = GFP_NOFS;
1915 cifs_reclassify_socket6(socket);
1916 }
1917
1918 /* user overrode default port */
1919 if (server->addr.sockAddr6.sin6_port) {
1920 rc = socket->ops->connect(socket,
1921 (struct sockaddr *) &server->addr.sockAddr6,
1922 sizeof(struct sockaddr_in6), 0);
1923 if (rc >= 0)
1924 connected = true;
1925 }
1926
1927 if (!connected) {
1928 /* save original port so we can retry user specified port
1929 later if fall back ports fail this time */
1930
1931 orig_port = server->addr.sockAddr6.sin6_port;
1932 /* do not retry on the same port we just failed on */
1933 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1934 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1935 rc = socket->ops->connect(socket, (struct sockaddr *)
1936 &server->addr.sockAddr6,
1937 sizeof(struct sockaddr_in6), 0);
1938 if (rc >= 0)
1939 connected = true;
1940 }
1941 }
1942 if (!connected) {
1943 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1944 rc = socket->ops->connect(socket, (struct sockaddr *)
1945 &server->addr.sockAddr6,
1946 sizeof(struct sockaddr_in6), 0);
1947 if (rc >= 0)
1948 connected = true;
1949 }
1950
1951 /* give up here - unless we want to retry on different
1952 protocol families some day */
1953 if (!connected) {
1954 if (orig_port)
1955 server->addr.sockAddr6.sin6_port = orig_port;
1956 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1957 sock_release(socket);
1958 server->ssocket = NULL;
1959 return rc;
1960 }
1961
1962 /*
1963 * Eventually check for other socket options to change from
1964 * the default. sock_setsockopt not used because it expects
1965 * user space buffer
1966 */
1967 socket->sk->sk_rcvtimeo = 7 * HZ;
1968 socket->sk->sk_sndtimeo = 5 * HZ;
1969 server->ssocket = socket;
1970
1971 return rc;
1972 }
1973
1974 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1975 struct super_block *sb, struct smb_vol *vol_info)
1976 {
1977 /* if we are reconnecting then should we check to see if
1978 * any requested capabilities changed locally e.g. via
1979 * remount but we can not do much about it here
1980 * if they have (even if we could detect it by the following)
1981 * Perhaps we could add a backpointer to array of sb from tcon
1982 * or if we change to make all sb to same share the same
1983 * sb as NFS - then we only have one backpointer to sb.
1984 * What if we wanted to mount the server share twice once with
1985 * and once without posixacls or posix paths? */
1986 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1987
1988 if (vol_info && vol_info->no_linux_ext) {
1989 tcon->fsUnixInfo.Capability = 0;
1990 tcon->unix_ext = 0; /* Unix Extensions disabled */
1991 cFYI(1, ("Linux protocol extensions disabled"));
1992 return;
1993 } else if (vol_info)
1994 tcon->unix_ext = 1; /* Unix Extensions supported */
1995
1996 if (tcon->unix_ext == 0) {
1997 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1998 return;
1999 }
2000
2001 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2002 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2003
2004 /* check for reconnect case in which we do not
2005 want to change the mount behavior if we can avoid it */
2006 if (vol_info == NULL) {
2007 /* turn off POSIX ACL and PATHNAMES if not set
2008 originally at mount time */
2009 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2010 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2011 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2012 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2013 cERROR(1, ("POSIXPATH support change"));
2014 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2015 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2016 cERROR(1, ("possible reconnect error"));
2017 cERROR(1,
2018 ("server disabled POSIX path support"));
2019 }
2020 }
2021
2022 cap &= CIFS_UNIX_CAP_MASK;
2023 if (vol_info && vol_info->no_psx_acl)
2024 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2025 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2026 cFYI(1, ("negotiated posix acl support"));
2027 if (sb)
2028 sb->s_flags |= MS_POSIXACL;
2029 }
2030
2031 if (vol_info && vol_info->posix_paths == 0)
2032 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2033 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2034 cFYI(1, ("negotiate posix pathnames"));
2035 if (sb)
2036 CIFS_SB(sb)->mnt_cifs_flags |=
2037 CIFS_MOUNT_POSIX_PATHS;
2038 }
2039
2040 /* We might be setting the path sep back to a different
2041 form if we are reconnecting and the server switched its
2042 posix path capability for this share */
2043 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2044 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2045
2046 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2047 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2048 CIFS_SB(sb)->rsize = 127 * 1024;
2049 cFYI(DBG2,
2050 ("larger reads not supported by srv"));
2051 }
2052 }
2053
2054
2055 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2056 #ifdef CONFIG_CIFS_DEBUG2
2057 if (cap & CIFS_UNIX_FCNTL_CAP)
2058 cFYI(1, ("FCNTL cap"));
2059 if (cap & CIFS_UNIX_EXTATTR_CAP)
2060 cFYI(1, ("EXTATTR cap"));
2061 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2062 cFYI(1, ("POSIX path cap"));
2063 if (cap & CIFS_UNIX_XATTR_CAP)
2064 cFYI(1, ("XATTR cap"));
2065 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2066 cFYI(1, ("POSIX ACL cap"));
2067 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2068 cFYI(1, ("very large read cap"));
2069 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2070 cFYI(1, ("very large write cap"));
2071 #endif /* CIFS_DEBUG2 */
2072 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2073 if (vol_info == NULL) {
2074 cFYI(1, ("resetting capabilities failed"));
2075 } else
2076 cERROR(1, ("Negotiating Unix capabilities "
2077 "with the server failed. Consider "
2078 "mounting with the Unix Extensions\n"
2079 "disabled, if problems are found, "
2080 "by specifying the nounix mount "
2081 "option."));
2082
2083 }
2084 }
2085 }
2086
2087 static void
2088 convert_delimiter(char *path, char delim)
2089 {
2090 int i;
2091 char old_delim;
2092
2093 if (path == NULL)
2094 return;
2095
2096 if (delim == '/')
2097 old_delim = '\\';
2098 else
2099 old_delim = '/';
2100
2101 for (i = 0; path[i] != '\0'; i++) {
2102 if (path[i] == old_delim)
2103 path[i] = delim;
2104 }
2105 }
2106
2107 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2108 struct cifs_sb_info *cifs_sb)
2109 {
2110 if (pvolume_info->rsize > CIFSMaxBufSize) {
2111 cERROR(1, ("rsize %d too large, using MaxBufSize",
2112 pvolume_info->rsize));
2113 cifs_sb->rsize = CIFSMaxBufSize;
2114 } else if ((pvolume_info->rsize) &&
2115 (pvolume_info->rsize <= CIFSMaxBufSize))
2116 cifs_sb->rsize = pvolume_info->rsize;
2117 else /* default */
2118 cifs_sb->rsize = CIFSMaxBufSize;
2119
2120 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2121 cERROR(1, ("wsize %d too large, using 4096 instead",
2122 pvolume_info->wsize));
2123 cifs_sb->wsize = 4096;
2124 } else if (pvolume_info->wsize)
2125 cifs_sb->wsize = pvolume_info->wsize;
2126 else
2127 cifs_sb->wsize = min_t(const int,
2128 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2129 127*1024);
2130 /* old default of CIFSMaxBufSize was too small now
2131 that SMB Write2 can send multiple pages in kvec.
2132 RFC1001 does not describe what happens when frame
2133 bigger than 128K is sent so use that as max in
2134 conjunction with 52K kvec constraint on arch with 4K
2135 page size */
2136
2137 if (cifs_sb->rsize < 2048) {
2138 cifs_sb->rsize = 2048;
2139 /* Windows ME may prefer this */
2140 cFYI(1, ("readsize set to minimum: 2048"));
2141 }
2142 /* calculate prepath */
2143 cifs_sb->prepath = pvolume_info->prepath;
2144 if (cifs_sb->prepath) {
2145 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2146 /* we can not convert the / to \ in the path
2147 separators in the prefixpath yet because we do not
2148 know (until reset_cifs_unix_caps is called later)
2149 whether POSIX PATH CAP is available. We normalize
2150 the / to \ after reset_cifs_unix_caps is called */
2151 pvolume_info->prepath = NULL;
2152 } else
2153 cifs_sb->prepathlen = 0;
2154 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2155 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2156 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2157 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2158 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2159 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2160
2161 if (pvolume_info->noperm)
2162 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2163 if (pvolume_info->setuids)
2164 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2165 if (pvolume_info->server_ino)
2166 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2167 if (pvolume_info->remap)
2168 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2169 if (pvolume_info->no_xattr)
2170 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2171 if (pvolume_info->sfu_emul)
2172 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2173 if (pvolume_info->nobrl)
2174 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2175 if (pvolume_info->nostrictsync)
2176 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2177 if (pvolume_info->mand_lock)
2178 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2179 if (pvolume_info->cifs_acl)
2180 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2181 if (pvolume_info->override_uid)
2182 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2183 if (pvolume_info->override_gid)
2184 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2185 if (pvolume_info->dynperm)
2186 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2187 if (pvolume_info->direct_io) {
2188 cFYI(1, ("mounting share using direct i/o"));
2189 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2190 }
2191
2192 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2193 cERROR(1, ("mount option dynperm ignored if cifsacl "
2194 "mount option supported"));
2195 }
2196
2197 static int
2198 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2199 struct cifs_sb_info *cifs_sb, const char *full_path)
2200 {
2201 int rc;
2202 __u64 inode_num;
2203 FILE_ALL_INFO *pfile_info;
2204
2205 rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2206 cifs_sb->local_nls,
2207 cifs_sb->mnt_cifs_flags &
2208 CIFS_MOUNT_MAP_SPECIAL_CHR);
2209 if (rc != -EOPNOTSUPP)
2210 return rc;
2211
2212 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2213 if (pfile_info == NULL)
2214 return -ENOMEM;
2215
2216 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2217 0 /* not legacy */, cifs_sb->local_nls,
2218 cifs_sb->mnt_cifs_flags &
2219 CIFS_MOUNT_MAP_SPECIAL_CHR);
2220 kfree(pfile_info);
2221 return rc;
2222 }
2223
2224 static void
2225 cleanup_volume_info(struct smb_vol **pvolume_info)
2226 {
2227 struct smb_vol *volume_info;
2228
2229 if (!pvolume_info && !*pvolume_info)
2230 return;
2231
2232 volume_info = *pvolume_info;
2233 kzfree(volume_info->password);
2234 kfree(volume_info->UNC);
2235 kfree(volume_info->prepath);
2236 kfree(volume_info);
2237 *pvolume_info = NULL;
2238 return;
2239 }
2240
2241 #ifdef CONFIG_CIFS_DFS_UPCALL
2242 /* build_path_to_root returns full path to root when
2243 * we do not have an exiting connection (tcon) */
2244 static char *
2245 build_unc_path_to_root(const struct smb_vol *volume_info,
2246 const struct cifs_sb_info *cifs_sb)
2247 {
2248 char *full_path;
2249
2250 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2251 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2252 if (full_path == NULL)
2253 return ERR_PTR(-ENOMEM);
2254
2255 strncpy(full_path, volume_info->UNC, unc_len);
2256 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2257 int i;
2258 for (i = 0; i < unc_len; i++) {
2259 if (full_path[i] == '\\')
2260 full_path[i] = '/';
2261 }
2262 }
2263
2264 if (cifs_sb->prepathlen)
2265 strncpy(full_path + unc_len, cifs_sb->prepath,
2266 cifs_sb->prepathlen);
2267
2268 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2269 return full_path;
2270 }
2271 #endif
2272
2273 int
2274 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2275 char *mount_data_global, const char *devname)
2276 {
2277 int rc = 0;
2278 int xid;
2279 struct smb_vol *volume_info;
2280 struct cifsSesInfo *pSesInfo = NULL;
2281 struct cifsTconInfo *tcon = NULL;
2282 struct TCP_Server_Info *srvTcp = NULL;
2283 char *full_path;
2284 char *mount_data = mount_data_global;
2285 #ifdef CONFIG_CIFS_DFS_UPCALL
2286 struct dfs_info3_param *referrals = NULL;
2287 unsigned int num_referrals = 0;
2288 int referral_walks_count = 0;
2289 try_mount_again:
2290 #endif
2291 full_path = NULL;
2292
2293 xid = GetXid();
2294
2295 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2296 if (!volume_info) {
2297 rc = -ENOMEM;
2298 goto out;
2299 }
2300
2301 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2302 rc = -EINVAL;
2303 goto out;
2304 }
2305
2306 if (volume_info->nullauth) {
2307 cFYI(1, ("null user"));
2308 volume_info->username = "";
2309 } else if (volume_info->username) {
2310 /* BB fixme parse for domain name here */
2311 cFYI(1, ("Username: %s", volume_info->username));
2312 } else {
2313 cifserror("No username specified");
2314 /* In userspace mount helper we can get user name from alternate
2315 locations such as env variables and files on disk */
2316 rc = -EINVAL;
2317 goto out;
2318 }
2319
2320
2321 /* this is needed for ASCII cp to Unicode converts */
2322 if (volume_info->iocharset == NULL) {
2323 cifs_sb->local_nls = load_nls_default();
2324 /* load_nls_default can not return null */
2325 } else {
2326 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2327 if (cifs_sb->local_nls == NULL) {
2328 cERROR(1, ("CIFS mount error: iocharset %s not found",
2329 volume_info->iocharset));
2330 rc = -ELIBACC;
2331 goto out;
2332 }
2333 }
2334
2335 /* get a reference to a tcp session */
2336 srvTcp = cifs_get_tcp_session(volume_info);
2337 if (IS_ERR(srvTcp)) {
2338 rc = PTR_ERR(srvTcp);
2339 goto out;
2340 }
2341
2342 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2343 if (pSesInfo) {
2344 cFYI(1, ("Existing smb sess found (status=%d)",
2345 pSesInfo->status));
2346 /*
2347 * The existing SMB session already has a reference to srvTcp,
2348 * so we can put back the extra one we got before
2349 */
2350 cifs_put_tcp_session(srvTcp);
2351
2352 down(&pSesInfo->sesSem);
2353 if (pSesInfo->need_reconnect) {
2354 cFYI(1, ("Session needs reconnect"));
2355 rc = cifs_setup_session(xid, pSesInfo,
2356 cifs_sb->local_nls);
2357 }
2358 up(&pSesInfo->sesSem);
2359 } else if (!rc) {
2360 cFYI(1, ("Existing smb sess not found"));
2361 pSesInfo = sesInfoAlloc();
2362 if (pSesInfo == NULL) {
2363 rc = -ENOMEM;
2364 goto mount_fail_check;
2365 }
2366
2367 /* new SMB session uses our srvTcp ref */
2368 pSesInfo->server = srvTcp;
2369 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2370 sprintf(pSesInfo->serverName, "%pI6",
2371 &srvTcp->addr.sockAddr6.sin6_addr);
2372 else
2373 sprintf(pSesInfo->serverName, "%pI4",
2374 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2375
2376 write_lock(&cifs_tcp_ses_lock);
2377 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2378 write_unlock(&cifs_tcp_ses_lock);
2379
2380 /* volume_info->password freed at unmount */
2381 if (volume_info->password) {
2382 pSesInfo->password = kstrdup(volume_info->password,
2383 GFP_KERNEL);
2384 if (!pSesInfo->password) {
2385 rc = -ENOMEM;
2386 goto mount_fail_check;
2387 }
2388 }
2389 if (volume_info->username)
2390 strncpy(pSesInfo->userName, volume_info->username,
2391 MAX_USERNAME_SIZE);
2392 if (volume_info->domainname) {
2393 int len = strlen(volume_info->domainname);
2394 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2395 if (pSesInfo->domainName)
2396 strcpy(pSesInfo->domainName,
2397 volume_info->domainname);
2398 }
2399 pSesInfo->linux_uid = volume_info->linux_uid;
2400 pSesInfo->overrideSecFlg = volume_info->secFlg;
2401 down(&pSesInfo->sesSem);
2402
2403 /* BB FIXME need to pass vol->secFlgs BB */
2404 rc = cifs_setup_session(xid, pSesInfo,
2405 cifs_sb->local_nls);
2406 up(&pSesInfo->sesSem);
2407 }
2408
2409 /* search for existing tcon to this server share */
2410 if (!rc) {
2411 setup_cifs_sb(volume_info, cifs_sb);
2412
2413 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2414 if (tcon) {
2415 cFYI(1, ("Found match on UNC path"));
2416 /* existing tcon already has a reference */
2417 cifs_put_smb_ses(pSesInfo);
2418 if (tcon->seal != volume_info->seal)
2419 cERROR(1, ("transport encryption setting "
2420 "conflicts with existing tid"));
2421 } else {
2422 tcon = tconInfoAlloc();
2423 if (tcon == NULL) {
2424 rc = -ENOMEM;
2425 goto mount_fail_check;
2426 }
2427
2428 tcon->ses = pSesInfo;
2429 if (volume_info->password) {
2430 tcon->password = kstrdup(volume_info->password,
2431 GFP_KERNEL);
2432 if (!tcon->password) {
2433 rc = -ENOMEM;
2434 goto mount_fail_check;
2435 }
2436 }
2437
2438 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2439 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2440 cERROR(1, ("Missing share name"));
2441 rc = -ENODEV;
2442 goto mount_fail_check;
2443 } else {
2444 /* BB Do we need to wrap sesSem around
2445 * this TCon call and Unix SetFS as
2446 * we do on SessSetup and reconnect? */
2447 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2448 tcon, cifs_sb->local_nls);
2449 cFYI(1, ("CIFS Tcon rc = %d", rc));
2450 if (volume_info->nodfs) {
2451 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2452 cFYI(1, ("DFS disabled (%d)",
2453 tcon->Flags));
2454 }
2455 }
2456 if (rc)
2457 goto remote_path_check;
2458 tcon->seal = volume_info->seal;
2459 write_lock(&cifs_tcp_ses_lock);
2460 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2461 write_unlock(&cifs_tcp_ses_lock);
2462 }
2463
2464 /* we can have only one retry value for a connection
2465 to a share so for resources mounted more than once
2466 to the same server share the last value passed in
2467 for the retry flag is used */
2468 tcon->retry = volume_info->retry;
2469 tcon->nocase = volume_info->nocase;
2470 tcon->local_lease = volume_info->local_lease;
2471 }
2472 if (pSesInfo) {
2473 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2474 sb->s_maxbytes = MAX_LFS_FILESIZE;
2475 else
2476 sb->s_maxbytes = MAX_NON_LFS;
2477 }
2478
2479 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2480 sb->s_time_gran = 100;
2481
2482 if (rc)
2483 goto remote_path_check;
2484
2485 cifs_sb->tcon = tcon;
2486
2487 /* do not care if following two calls succeed - informational */
2488 if (!tcon->ipc) {
2489 CIFSSMBQFSDeviceInfo(xid, tcon);
2490 CIFSSMBQFSAttributeInfo(xid, tcon);
2491 }
2492
2493 /* tell server which Unix caps we support */
2494 if (tcon->ses->capabilities & CAP_UNIX)
2495 /* reset of caps checks mount to see if unix extensions
2496 disabled for just this mount */
2497 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2498 else
2499 tcon->unix_ext = 0; /* server does not support them */
2500
2501 /* convert forward to back slashes in prepath here if needed */
2502 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2503 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2504
2505 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2506 cifs_sb->rsize = 1024 * 127;
2507 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2508 }
2509 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2510 cifs_sb->wsize = min(cifs_sb->wsize,
2511 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2512 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2513 cifs_sb->rsize = min(cifs_sb->rsize,
2514 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2515
2516 remote_path_check:
2517 /* check if a whole path (including prepath) is not remote */
2518 if (!rc && cifs_sb->prepathlen && tcon) {
2519 /* build_path_to_root works only when we have a valid tcon */
2520 full_path = cifs_build_path_to_root(cifs_sb);
2521 if (full_path == NULL) {
2522 rc = -ENOMEM;
2523 goto mount_fail_check;
2524 }
2525 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2526 if (rc != -EREMOTE) {
2527 kfree(full_path);
2528 goto mount_fail_check;
2529 }
2530 kfree(full_path);
2531 }
2532
2533 /* get referral if needed */
2534 if (rc == -EREMOTE) {
2535 #ifdef CONFIG_CIFS_DFS_UPCALL
2536 if (referral_walks_count > MAX_NESTED_LINKS) {
2537 /*
2538 * BB: when we implement proper loop detection,
2539 * we will remove this check. But now we need it
2540 * to prevent an indefinite loop if 'DFS tree' is
2541 * misconfigured (i.e. has loops).
2542 */
2543 rc = -ELOOP;
2544 goto mount_fail_check;
2545 }
2546 /* convert forward to back slashes in prepath here if needed */
2547 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2548 convert_delimiter(cifs_sb->prepath,
2549 CIFS_DIR_SEP(cifs_sb));
2550 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2551 if (IS_ERR(full_path)) {
2552 rc = PTR_ERR(full_path);
2553 goto mount_fail_check;
2554 }
2555
2556 cFYI(1, ("Getting referral for: %s", full_path));
2557 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2558 cifs_sb->local_nls, &num_referrals, &referrals,
2559 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2560 if (!rc && num_referrals > 0) {
2561 char *fake_devname = NULL;
2562
2563 if (mount_data != mount_data_global)
2564 kfree(mount_data);
2565
2566 mount_data = cifs_compose_mount_options(
2567 cifs_sb->mountdata, full_path + 1,
2568 referrals, &fake_devname);
2569
2570 free_dfs_info_array(referrals, num_referrals);
2571 kfree(fake_devname);
2572 kfree(full_path);
2573
2574 if (IS_ERR(mount_data)) {
2575 rc = PTR_ERR(mount_data);
2576 mount_data = NULL;
2577 goto mount_fail_check;
2578 }
2579
2580 if (tcon)
2581 cifs_put_tcon(tcon);
2582 else if (pSesInfo)
2583 cifs_put_smb_ses(pSesInfo);
2584
2585 cleanup_volume_info(&volume_info);
2586 referral_walks_count++;
2587 goto try_mount_again;
2588 }
2589 #else /* No DFS support, return error on mount */
2590 rc = -EOPNOTSUPP;
2591 #endif
2592 }
2593
2594 mount_fail_check:
2595 /* on error free sesinfo and tcon struct if needed */
2596 if (rc) {
2597 if (mount_data != mount_data_global)
2598 kfree(mount_data);
2599 /* If find_unc succeeded then rc == 0 so we can not end */
2600 /* up accidently freeing someone elses tcon struct */
2601 if (tcon)
2602 cifs_put_tcon(tcon);
2603 else if (pSesInfo)
2604 cifs_put_smb_ses(pSesInfo);
2605 else
2606 cifs_put_tcp_session(srvTcp);
2607 goto out;
2608 }
2609
2610 /* volume_info->password is freed above when existing session found
2611 (in which case it is not needed anymore) but when new sesion is created
2612 the password ptr is put in the new session structure (in which case the
2613 password will be freed at unmount time) */
2614 out:
2615 /* zero out password before freeing */
2616 cleanup_volume_info(&volume_info);
2617 FreeXid(xid);
2618 return rc;
2619 }
2620
2621 int
2622 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2623 const char *tree, struct cifsTconInfo *tcon,
2624 const struct nls_table *nls_codepage)
2625 {
2626 struct smb_hdr *smb_buffer;
2627 struct smb_hdr *smb_buffer_response;
2628 TCONX_REQ *pSMB;
2629 TCONX_RSP *pSMBr;
2630 unsigned char *bcc_ptr;
2631 int rc = 0;
2632 int length, bytes_left;
2633 __u16 count;
2634
2635 if (ses == NULL)
2636 return -EIO;
2637
2638 smb_buffer = cifs_buf_get();
2639 if (smb_buffer == NULL) {
2640 return -ENOMEM;
2641 }
2642 smb_buffer_response = smb_buffer;
2643
2644 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2645 NULL /*no tid */ , 4 /*wct */ );
2646
2647 smb_buffer->Mid = GetNextMid(ses->server);
2648 smb_buffer->Uid = ses->Suid;
2649 pSMB = (TCONX_REQ *) smb_buffer;
2650 pSMBr = (TCONX_RSP *) smb_buffer_response;
2651
2652 pSMB->AndXCommand = 0xFF;
2653 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2654 bcc_ptr = &pSMB->Password[0];
2655 if ((ses->server->secMode) & SECMODE_USER) {
2656 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2657 *bcc_ptr = 0; /* password is null byte */
2658 bcc_ptr++; /* skip password */
2659 /* already aligned so no need to do it below */
2660 } else {
2661 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2662 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2663 specified as required (when that support is added to
2664 the vfs in the future) as only NTLM or the much
2665 weaker LANMAN (which we do not send by default) is accepted
2666 by Samba (not sure whether other servers allow
2667 NTLMv2 password here) */
2668 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2669 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2670 (ses->server->secType == LANMAN))
2671 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2672 ses->server->secMode &
2673 SECMODE_PW_ENCRYPT ? true : false,
2674 bcc_ptr);
2675 else
2676 #endif /* CIFS_WEAK_PW_HASH */
2677 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2678 bcc_ptr);
2679
2680 bcc_ptr += CIFS_SESS_KEY_SIZE;
2681 if (ses->capabilities & CAP_UNICODE) {
2682 /* must align unicode strings */
2683 *bcc_ptr = 0; /* null byte password */
2684 bcc_ptr++;
2685 }
2686 }
2687
2688 if (ses->server->secMode &
2689 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2690 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2691
2692 if (ses->capabilities & CAP_STATUS32) {
2693 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2694 }
2695 if (ses->capabilities & CAP_DFS) {
2696 smb_buffer->Flags2 |= SMBFLG2_DFS;
2697 }
2698 if (ses->capabilities & CAP_UNICODE) {
2699 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2700 length =
2701 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2702 6 /* max utf8 char length in bytes */ *
2703 (/* server len*/ + 256 /* share len */), nls_codepage);
2704 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2705 bcc_ptr += 2; /* skip trailing null */
2706 } else { /* ASCII */
2707 strcpy(bcc_ptr, tree);
2708 bcc_ptr += strlen(tree) + 1;
2709 }
2710 strcpy(bcc_ptr, "?????");
2711 bcc_ptr += strlen("?????");
2712 bcc_ptr += 1;
2713 count = bcc_ptr - &pSMB->Password[0];
2714 pSMB->hdr.smb_buf_length += count;
2715 pSMB->ByteCount = cpu_to_le16(count);
2716
2717 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2718 CIFS_STD_OP);
2719
2720 /* above now done in SendReceive */
2721 if ((rc == 0) && (tcon != NULL)) {
2722 bool is_unicode;
2723
2724 tcon->tidStatus = CifsGood;
2725 tcon->need_reconnect = false;
2726 tcon->tid = smb_buffer_response->Tid;
2727 bcc_ptr = pByteArea(smb_buffer_response);
2728 bytes_left = BCC(smb_buffer_response);
2729 length = strnlen(bcc_ptr, bytes_left - 2);
2730 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2731 is_unicode = true;
2732 else
2733 is_unicode = false;
2734
2735
2736 /* skip service field (NB: this field is always ASCII) */
2737 if (length == 3) {
2738 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2739 (bcc_ptr[2] == 'C')) {
2740 cFYI(1, ("IPC connection"));
2741 tcon->ipc = 1;
2742 }
2743 } else if (length == 2) {
2744 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2745 /* the most common case */
2746 cFYI(1, ("disk share connection"));
2747 }
2748 }
2749 bcc_ptr += length + 1;
2750 bytes_left -= (length + 1);
2751 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2752
2753 /* mostly informational -- no need to fail on error here */
2754 kfree(tcon->nativeFileSystem);
2755 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2756 bytes_left, is_unicode,
2757 nls_codepage);
2758
2759 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2760
2761 if ((smb_buffer_response->WordCount == 3) ||
2762 (smb_buffer_response->WordCount == 7))
2763 /* field is in same location */
2764 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2765 else
2766 tcon->Flags = 0;
2767 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2768 } else if ((rc == 0) && tcon == NULL) {
2769 /* all we need to save for IPC$ connection */
2770 ses->ipc_tid = smb_buffer_response->Tid;
2771 }
2772
2773 cifs_buf_release(smb_buffer);
2774 return rc;
2775 }
2776
2777 int
2778 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2779 {
2780 int rc = 0;
2781 char *tmp;
2782
2783 if (cifs_sb->tcon)
2784 cifs_put_tcon(cifs_sb->tcon);
2785
2786 cifs_sb->tcon = NULL;
2787 tmp = cifs_sb->prepath;
2788 cifs_sb->prepathlen = 0;
2789 cifs_sb->prepath = NULL;
2790 kfree(tmp);
2791
2792 return rc;
2793 }
2794
2795 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2796 struct nls_table *nls_info)
2797 {
2798 int rc = 0;
2799 int first_time = 0;
2800 struct TCP_Server_Info *server = pSesInfo->server;
2801
2802 /* what if server changes its buffer size after dropping the session? */
2803 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2804 rc = CIFSSMBNegotiate(xid, pSesInfo);
2805 if (rc == -EAGAIN) {
2806 /* retry only once on 1st time connection */
2807 rc = CIFSSMBNegotiate(xid, pSesInfo);
2808 if (rc == -EAGAIN)
2809 rc = -EHOSTDOWN;
2810 }
2811 if (rc == 0) {
2812 spin_lock(&GlobalMid_Lock);
2813 if (server->tcpStatus != CifsExiting)
2814 server->tcpStatus = CifsGood;
2815 else
2816 rc = -EHOSTDOWN;
2817 spin_unlock(&GlobalMid_Lock);
2818
2819 }
2820 first_time = 1;
2821 }
2822
2823 if (rc)
2824 goto ss_err_exit;
2825
2826 pSesInfo->flags = 0;
2827 pSesInfo->capabilities = server->capabilities;
2828 if (linuxExtEnabled == 0)
2829 pSesInfo->capabilities &= (~CAP_UNIX);
2830
2831 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2832 server->secMode, server->capabilities, server->timeAdj));
2833
2834 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2835 if (rc) {
2836 cERROR(1, ("Send error in SessSetup = %d", rc));
2837 } else {
2838 cFYI(1, ("CIFS Session Established successfully"));
2839 spin_lock(&GlobalMid_Lock);
2840 pSesInfo->status = CifsGood;
2841 pSesInfo->need_reconnect = false;
2842 spin_unlock(&GlobalMid_Lock);
2843 }
2844
2845 ss_err_exit:
2846 return rc;
2847 }
2848
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