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cifs: move tcon find/create into separate function
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blobc104f54cadfed5dfa7eb986f7ea5e44fd48a7c65
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 "cn_cifs.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 linux_uid;
70 gid_t linux_gid;
71 mode_t file_mode;
72 mode_t dir_mode;
73 unsigned secFlg;
74 bool retry:1;
75 bool intr:1;
76 bool setuids:1;
77 bool override_uid:1;
78 bool override_gid:1;
79 bool dynperm:1;
80 bool noperm:1;
81 bool no_psx_acl:1; /* set if posix acl support should be disabled */
82 bool cifs_acl:1;
83 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
84 bool server_ino:1; /* use inode numbers from server ie UniqueId */
85 bool direct_io:1;
86 bool remap:1; /* set to remap seven reserved chars in filenames */
87 bool posix_paths:1; /* unset to not ask for posix pathnames. */
88 bool no_linux_ext:1;
89 bool sfu_emul:1;
90 bool nullauth:1; /* attempt to authenticate with null user */
91 bool nocase:1; /* request case insensitive filenames */
92 bool nobrl:1; /* disable sending byte range locks to srv */
93 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
94 bool seal:1; /* request transport encryption on share */
95 bool nodfs:1; /* Do not request DFS, even if available */
96 bool local_lease:1; /* check leases only on local system, not remote */
97 bool noblocksnd:1;
98 bool noautotune:1;
99 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
100 unsigned int rsize;
101 unsigned int wsize;
102 bool sockopt_tcp_nodelay:1;
103 unsigned short int port;
104 char *prepath;
105 struct nls_table *local_nls;
106 };
107
108 static int ipv4_connect(struct TCP_Server_Info *server);
109 static int ipv6_connect(struct TCP_Server_Info *server);
110
111 /*
112 * cifs tcp session reconnection
113 *
114 * mark tcp session as reconnecting so temporarily locked
115 * mark all smb sessions as reconnecting for tcp session
116 * reconnect tcp session
117 * wake up waiters on reconnection? - (not needed currently)
118 */
119 static int
120 cifs_reconnect(struct TCP_Server_Info *server)
121 {
122 int rc = 0;
123 struct list_head *tmp, *tmp2;
124 struct cifsSesInfo *ses;
125 struct cifsTconInfo *tcon;
126 struct mid_q_entry *mid_entry;
127
128 spin_lock(&GlobalMid_Lock);
129 if (server->tcpStatus == CifsExiting) {
130 /* the demux thread will exit normally
131 next time through the loop */
132 spin_unlock(&GlobalMid_Lock);
133 return rc;
134 } else
135 server->tcpStatus = CifsNeedReconnect;
136 spin_unlock(&GlobalMid_Lock);
137 server->maxBuf = 0;
138
139 cFYI(1, "Reconnecting tcp session");
140
141 /* before reconnecting the tcp session, mark the smb session (uid)
142 and the tid bad so they are not used until reconnected */
143 read_lock(&cifs_tcp_ses_lock);
144 list_for_each(tmp, &server->smb_ses_list) {
145 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
146 ses->need_reconnect = true;
147 ses->ipc_tid = 0;
148 list_for_each(tmp2, &ses->tcon_list) {
149 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
150 tcon->need_reconnect = true;
151 }
152 }
153 read_unlock(&cifs_tcp_ses_lock);
154 /* do not want to be sending data on a socket we are freeing */
155 mutex_lock(&server->srv_mutex);
156 if (server->ssocket) {
157 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
158 server->ssocket->flags);
159 kernel_sock_shutdown(server->ssocket, SHUT_WR);
160 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
161 server->ssocket->state,
162 server->ssocket->flags);
163 sock_release(server->ssocket);
164 server->ssocket = NULL;
165 }
166
167 spin_lock(&GlobalMid_Lock);
168 list_for_each(tmp, &server->pending_mid_q) {
169 mid_entry = list_entry(tmp, struct
170 mid_q_entry,
171 qhead);
172 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
173 /* Mark other intransit requests as needing
174 retry so we do not immediately mark the
175 session bad again (ie after we reconnect
176 below) as they timeout too */
177 mid_entry->midState = MID_RETRY_NEEDED;
178 }
179 }
180 spin_unlock(&GlobalMid_Lock);
181 mutex_unlock(&server->srv_mutex);
182
183 while ((server->tcpStatus != CifsExiting) &&
184 (server->tcpStatus != CifsGood)) {
185 try_to_freeze();
186 if (server->addr.sockAddr6.sin6_family == AF_INET6)
187 rc = ipv6_connect(server);
188 else
189 rc = ipv4_connect(server);
190 if (rc) {
191 cFYI(1, "reconnect error %d", rc);
192 msleep(3000);
193 } else {
194 atomic_inc(&tcpSesReconnectCount);
195 spin_lock(&GlobalMid_Lock);
196 if (server->tcpStatus != CifsExiting)
197 server->tcpStatus = CifsGood;
198 server->sequence_number = 0;
199 spin_unlock(&GlobalMid_Lock);
200 /* atomic_set(&server->inFlight,0);*/
201 wake_up(&server->response_q);
202 }
203 }
204 return rc;
205 }
206
207 /*
208 return codes:
209 0 not a transact2, or all data present
210 >0 transact2 with that much data missing
211 -EINVAL = invalid transact2
212
213 */
214 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
215 {
216 struct smb_t2_rsp *pSMBt;
217 int total_data_size;
218 int data_in_this_rsp;
219 int remaining;
220
221 if (pSMB->Command != SMB_COM_TRANSACTION2)
222 return 0;
223
224 /* check for plausible wct, bcc and t2 data and parm sizes */
225 /* check for parm and data offset going beyond end of smb */
226 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
227 cFYI(1, "invalid transact2 word count");
228 return -EINVAL;
229 }
230
231 pSMBt = (struct smb_t2_rsp *)pSMB;
232
233 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
234 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
235
236 remaining = total_data_size - data_in_this_rsp;
237
238 if (remaining == 0)
239 return 0;
240 else if (remaining < 0) {
241 cFYI(1, "total data %d smaller than data in frame %d",
242 total_data_size, data_in_this_rsp);
243 return -EINVAL;
244 } else {
245 cFYI(1, "missing %d bytes from transact2, check next response",
246 remaining);
247 if (total_data_size > maxBufSize) {
248 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
249 total_data_size, maxBufSize);
250 return -EINVAL;
251 }
252 return remaining;
253 }
254 }
255
256 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
257 {
258 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
259 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
260 int total_data_size;
261 int total_in_buf;
262 int remaining;
263 int total_in_buf2;
264 char *data_area_of_target;
265 char *data_area_of_buf2;
266 __u16 byte_count;
267
268 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
269
270 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
271 cFYI(1, "total data size of primary and secondary t2 differ");
272 }
273
274 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
275
276 remaining = total_data_size - total_in_buf;
277
278 if (remaining < 0)
279 return -EINVAL;
280
281 if (remaining == 0) /* nothing to do, ignore */
282 return 0;
283
284 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
285 if (remaining < total_in_buf2) {
286 cFYI(1, "transact2 2nd response contains too much data");
287 }
288
289 /* find end of first SMB data area */
290 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
291 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
292 /* validate target area */
293
294 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
295 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
296
297 data_area_of_target += total_in_buf;
298
299 /* copy second buffer into end of first buffer */
300 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
301 total_in_buf += total_in_buf2;
302 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
303 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
304 byte_count += total_in_buf2;
305 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
306
307 byte_count = pTargetSMB->smb_buf_length;
308 byte_count += total_in_buf2;
309
310 /* BB also add check that we are not beyond maximum buffer size */
311
312 pTargetSMB->smb_buf_length = byte_count;
313
314 if (remaining == total_in_buf2) {
315 cFYI(1, "found the last secondary response");
316 return 0; /* we are done */
317 } else /* more responses to go */
318 return 1;
319
320 }
321
322 static int
323 cifs_demultiplex_thread(struct TCP_Server_Info *server)
324 {
325 int length;
326 unsigned int pdu_length, total_read;
327 struct smb_hdr *smb_buffer = NULL;
328 struct smb_hdr *bigbuf = NULL;
329 struct smb_hdr *smallbuf = NULL;
330 struct msghdr smb_msg;
331 struct kvec iov;
332 struct socket *csocket = server->ssocket;
333 struct list_head *tmp;
334 struct cifsSesInfo *ses;
335 struct task_struct *task_to_wake = NULL;
336 struct mid_q_entry *mid_entry;
337 char temp;
338 bool isLargeBuf = false;
339 bool isMultiRsp;
340 int reconnect;
341
342 current->flags |= PF_MEMALLOC;
343 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
344
345 length = atomic_inc_return(&tcpSesAllocCount);
346 if (length > 1)
347 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
348 GFP_KERNEL);
349
350 set_freezable();
351 while (server->tcpStatus != CifsExiting) {
352 if (try_to_freeze())
353 continue;
354 if (bigbuf == NULL) {
355 bigbuf = cifs_buf_get();
356 if (!bigbuf) {
357 cERROR(1, "No memory for large SMB response");
358 msleep(3000);
359 /* retry will check if exiting */
360 continue;
361 }
362 } else if (isLargeBuf) {
363 /* we are reusing a dirty large buf, clear its start */
364 memset(bigbuf, 0, sizeof(struct smb_hdr));
365 }
366
367 if (smallbuf == NULL) {
368 smallbuf = cifs_small_buf_get();
369 if (!smallbuf) {
370 cERROR(1, "No memory for SMB response");
371 msleep(1000);
372 /* retry will check if exiting */
373 continue;
374 }
375 /* beginning of smb buffer is cleared in our buf_get */
376 } else /* if existing small buf clear beginning */
377 memset(smallbuf, 0, sizeof(struct smb_hdr));
378
379 isLargeBuf = false;
380 isMultiRsp = false;
381 smb_buffer = smallbuf;
382 iov.iov_base = smb_buffer;
383 iov.iov_len = 4;
384 smb_msg.msg_control = NULL;
385 smb_msg.msg_controllen = 0;
386 pdu_length = 4; /* enough to get RFC1001 header */
387 incomplete_rcv:
388 length =
389 kernel_recvmsg(csocket, &smb_msg,
390 &iov, 1, pdu_length, 0 /* BB other flags? */);
391
392 if (server->tcpStatus == CifsExiting) {
393 break;
394 } else if (server->tcpStatus == CifsNeedReconnect) {
395 cFYI(1, "Reconnect after server stopped responding");
396 cifs_reconnect(server);
397 cFYI(1, "call to reconnect done");
398 csocket = server->ssocket;
399 continue;
400 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
401 msleep(1); /* minimum sleep to prevent looping
402 allowing socket to clear and app threads to set
403 tcpStatus CifsNeedReconnect if server hung */
404 if (pdu_length < 4) {
405 iov.iov_base = (4 - pdu_length) +
406 (char *)smb_buffer;
407 iov.iov_len = pdu_length;
408 smb_msg.msg_control = NULL;
409 smb_msg.msg_controllen = 0;
410 goto incomplete_rcv;
411 } else
412 continue;
413 } else if (length <= 0) {
414 if (server->tcpStatus == CifsNew) {
415 cFYI(1, "tcp session abend after SMBnegprot");
416 /* some servers kill the TCP session rather than
417 returning an SMB negprot error, in which
418 case reconnecting here is not going to help,
419 and so simply return error to mount */
420 break;
421 }
422 if (!try_to_freeze() && (length == -EINTR)) {
423 cFYI(1, "cifsd thread killed");
424 break;
425 }
426 cFYI(1, "Reconnect after unexpected peek error %d",
427 length);
428 cifs_reconnect(server);
429 csocket = server->ssocket;
430 wake_up(&server->response_q);
431 continue;
432 } else if (length < pdu_length) {
433 cFYI(1, "requested %d bytes but only got %d bytes",
434 pdu_length, length);
435 pdu_length -= length;
436 msleep(1);
437 goto incomplete_rcv;
438 }
439
440 /* The right amount was read from socket - 4 bytes */
441 /* so we can now interpret the length field */
442
443 /* the first byte big endian of the length field,
444 is actually not part of the length but the type
445 with the most common, zero, as regular data */
446 temp = *((char *) smb_buffer);
447
448 /* Note that FC 1001 length is big endian on the wire,
449 but we convert it here so it is always manipulated
450 as host byte order */
451 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
452 smb_buffer->smb_buf_length = pdu_length;
453
454 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
455
456 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
457 continue;
458 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
459 cFYI(1, "Good RFC 1002 session rsp");
460 continue;
461 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
462 /* we get this from Windows 98 instead of
463 an error on SMB negprot response */
464 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
465 pdu_length);
466 if (server->tcpStatus == CifsNew) {
467 /* if nack on negprot (rather than
468 ret of smb negprot error) reconnecting
469 not going to help, ret error to mount */
470 break;
471 } else {
472 /* give server a second to
473 clean up before reconnect attempt */
474 msleep(1000);
475 /* always try 445 first on reconnect
476 since we get NACK on some if we ever
477 connected to port 139 (the NACK is
478 since we do not begin with RFC1001
479 session initialize frame) */
480 server->addr.sockAddr.sin_port =
481 htons(CIFS_PORT);
482 cifs_reconnect(server);
483 csocket = server->ssocket;
484 wake_up(&server->response_q);
485 continue;
486 }
487 } else if (temp != (char) 0) {
488 cERROR(1, "Unknown RFC 1002 frame");
489 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
490 length);
491 cifs_reconnect(server);
492 csocket = server->ssocket;
493 continue;
494 }
495
496 /* else we have an SMB response */
497 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
498 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
499 cERROR(1, "Invalid size SMB length %d pdu_length %d",
500 length, pdu_length+4);
501 cifs_reconnect(server);
502 csocket = server->ssocket;
503 wake_up(&server->response_q);
504 continue;
505 }
506
507 /* else length ok */
508 reconnect = 0;
509
510 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
511 isLargeBuf = true;
512 memcpy(bigbuf, smallbuf, 4);
513 smb_buffer = bigbuf;
514 }
515 length = 0;
516 iov.iov_base = 4 + (char *)smb_buffer;
517 iov.iov_len = pdu_length;
518 for (total_read = 0; total_read < pdu_length;
519 total_read += length) {
520 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
521 pdu_length - total_read, 0);
522 if ((server->tcpStatus == CifsExiting) ||
523 (length == -EINTR)) {
524 /* then will exit */
525 reconnect = 2;
526 break;
527 } else if (server->tcpStatus == CifsNeedReconnect) {
528 cifs_reconnect(server);
529 csocket = server->ssocket;
530 /* Reconnect wakes up rspns q */
531 /* Now we will reread sock */
532 reconnect = 1;
533 break;
534 } else if ((length == -ERESTARTSYS) ||
535 (length == -EAGAIN)) {
536 msleep(1); /* minimum sleep to prevent looping,
537 allowing socket to clear and app
538 threads to set tcpStatus
539 CifsNeedReconnect if server hung*/
540 length = 0;
541 continue;
542 } else if (length <= 0) {
543 cERROR(1, "Received no data, expecting %d",
544 pdu_length - total_read);
545 cifs_reconnect(server);
546 csocket = server->ssocket;
547 reconnect = 1;
548 break;
549 }
550 }
551 if (reconnect == 2)
552 break;
553 else if (reconnect == 1)
554 continue;
555
556 length += 4; /* account for rfc1002 hdr */
557
558
559 dump_smb(smb_buffer, length);
560 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
561 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
562 continue;
563 }
564
565
566 task_to_wake = NULL;
567 spin_lock(&GlobalMid_Lock);
568 list_for_each(tmp, &server->pending_mid_q) {
569 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
570
571 if ((mid_entry->mid == smb_buffer->Mid) &&
572 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
573 (mid_entry->command == smb_buffer->Command)) {
574 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
575 /* We have a multipart transact2 resp */
576 isMultiRsp = true;
577 if (mid_entry->resp_buf) {
578 /* merge response - fix up 1st*/
579 if (coalesce_t2(smb_buffer,
580 mid_entry->resp_buf)) {
581 mid_entry->multiRsp =
582 true;
583 break;
584 } else {
585 /* all parts received */
586 mid_entry->multiEnd =
587 true;
588 goto multi_t2_fnd;
589 }
590 } else {
591 if (!isLargeBuf) {
592 cERROR(1, "1st trans2 resp needs bigbuf");
593 /* BB maybe we can fix this up, switch
594 to already allocated large buffer? */
595 } else {
596 /* Have first buffer */
597 mid_entry->resp_buf =
598 smb_buffer;
599 mid_entry->largeBuf =
600 true;
601 bigbuf = NULL;
602 }
603 }
604 break;
605 }
606 mid_entry->resp_buf = smb_buffer;
607 mid_entry->largeBuf = isLargeBuf;
608 multi_t2_fnd:
609 task_to_wake = mid_entry->tsk;
610 mid_entry->midState = MID_RESPONSE_RECEIVED;
611 #ifdef CONFIG_CIFS_STATS2
612 mid_entry->when_received = jiffies;
613 #endif
614 /* so we do not time out requests to server
615 which is still responding (since server could
616 be busy but not dead) */
617 server->lstrp = jiffies;
618 break;
619 }
620 }
621 spin_unlock(&GlobalMid_Lock);
622 if (task_to_wake) {
623 /* Was previous buf put in mpx struct for multi-rsp? */
624 if (!isMultiRsp) {
625 /* smb buffer will be freed by user thread */
626 if (isLargeBuf)
627 bigbuf = NULL;
628 else
629 smallbuf = NULL;
630 }
631 wake_up_process(task_to_wake);
632 } else if (!is_valid_oplock_break(smb_buffer, server) &&
633 !isMultiRsp) {
634 cERROR(1, "No task to wake, unknown frame received! "
635 "NumMids %d", midCount.counter);
636 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
637 sizeof(struct smb_hdr));
638 #ifdef CONFIG_CIFS_DEBUG2
639 cifs_dump_detail(smb_buffer);
640 cifs_dump_mids(server);
641 #endif /* CIFS_DEBUG2 */
642
643 }
644 } /* end while !EXITING */
645
646 /* take it off the list, if it's not already */
647 write_lock(&cifs_tcp_ses_lock);
648 list_del_init(&server->tcp_ses_list);
649 write_unlock(&cifs_tcp_ses_lock);
650
651 spin_lock(&GlobalMid_Lock);
652 server->tcpStatus = CifsExiting;
653 spin_unlock(&GlobalMid_Lock);
654 wake_up_all(&server->response_q);
655
656 /* check if we have blocked requests that need to free */
657 /* Note that cifs_max_pending is normally 50, but
658 can be set at module install time to as little as two */
659 spin_lock(&GlobalMid_Lock);
660 if (atomic_read(&server->inFlight) >= cifs_max_pending)
661 atomic_set(&server->inFlight, cifs_max_pending - 1);
662 /* We do not want to set the max_pending too low or we
663 could end up with the counter going negative */
664 spin_unlock(&GlobalMid_Lock);
665 /* Although there should not be any requests blocked on
666 this queue it can not hurt to be paranoid and try to wake up requests
667 that may haven been blocked when more than 50 at time were on the wire
668 to the same server - they now will see the session is in exit state
669 and get out of SendReceive. */
670 wake_up_all(&server->request_q);
671 /* give those requests time to exit */
672 msleep(125);
673
674 if (server->ssocket) {
675 sock_release(csocket);
676 server->ssocket = NULL;
677 }
678 /* buffer usuallly freed in free_mid - need to free it here on exit */
679 cifs_buf_release(bigbuf);
680 if (smallbuf) /* no sense logging a debug message if NULL */
681 cifs_small_buf_release(smallbuf);
682
683 /*
684 * BB: we shouldn't have to do any of this. It shouldn't be
685 * possible to exit from the thread with active SMB sessions
686 */
687 read_lock(&cifs_tcp_ses_lock);
688 if (list_empty(&server->pending_mid_q)) {
689 /* loop through server session structures attached to this and
690 mark them dead */
691 list_for_each(tmp, &server->smb_ses_list) {
692 ses = list_entry(tmp, struct cifsSesInfo,
693 smb_ses_list);
694 ses->status = CifsExiting;
695 ses->server = NULL;
696 }
697 read_unlock(&cifs_tcp_ses_lock);
698 } else {
699 /* although we can not zero the server struct pointer yet,
700 since there are active requests which may depnd on them,
701 mark the corresponding SMB sessions as exiting too */
702 list_for_each(tmp, &server->smb_ses_list) {
703 ses = list_entry(tmp, struct cifsSesInfo,
704 smb_ses_list);
705 ses->status = CifsExiting;
706 }
707
708 spin_lock(&GlobalMid_Lock);
709 list_for_each(tmp, &server->pending_mid_q) {
710 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
711 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
712 cFYI(1, "Clearing Mid 0x%x - waking up ",
713 mid_entry->mid);
714 task_to_wake = mid_entry->tsk;
715 if (task_to_wake)
716 wake_up_process(task_to_wake);
717 }
718 }
719 spin_unlock(&GlobalMid_Lock);
720 read_unlock(&cifs_tcp_ses_lock);
721 /* 1/8th of sec is more than enough time for them to exit */
722 msleep(125);
723 }
724
725 if (!list_empty(&server->pending_mid_q)) {
726 /* mpx threads have not exited yet give them
727 at least the smb send timeout time for long ops */
728 /* due to delays on oplock break requests, we need
729 to wait at least 45 seconds before giving up
730 on a request getting a response and going ahead
731 and killing cifsd */
732 cFYI(1, "Wait for exit from demultiplex thread");
733 msleep(46000);
734 /* if threads still have not exited they are probably never
735 coming home not much else we can do but free the memory */
736 }
737
738 /* last chance to mark ses pointers invalid
739 if there are any pointing to this (e.g
740 if a crazy root user tried to kill cifsd
741 kernel thread explicitly this might happen) */
742 /* BB: This shouldn't be necessary, see above */
743 read_lock(&cifs_tcp_ses_lock);
744 list_for_each(tmp, &server->smb_ses_list) {
745 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
746 ses->server = NULL;
747 }
748 read_unlock(&cifs_tcp_ses_lock);
749
750 kfree(server->hostname);
751 task_to_wake = xchg(&server->tsk, NULL);
752 kfree(server);
753
754 length = atomic_dec_return(&tcpSesAllocCount);
755 if (length > 0)
756 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
757 GFP_KERNEL);
758
759 /* if server->tsk was NULL then wait for a signal before exiting */
760 if (!task_to_wake) {
761 set_current_state(TASK_INTERRUPTIBLE);
762 while (!signal_pending(current)) {
763 schedule();
764 set_current_state(TASK_INTERRUPTIBLE);
765 }
766 set_current_state(TASK_RUNNING);
767 }
768
769 module_put_and_exit(0);
770 }
771
772 /* extract the host portion of the UNC string */
773 static char *
774 extract_hostname(const char *unc)
775 {
776 const char *src;
777 char *dst, *delim;
778 unsigned int len;
779
780 /* skip double chars at beginning of string */
781 /* BB: check validity of these bytes? */
782 src = unc + 2;
783
784 /* delimiter between hostname and sharename is always '\\' now */
785 delim = strchr(src, '\\');
786 if (!delim)
787 return ERR_PTR(-EINVAL);
788
789 len = delim - src;
790 dst = kmalloc((len + 1), GFP_KERNEL);
791 if (dst == NULL)
792 return ERR_PTR(-ENOMEM);
793
794 memcpy(dst, src, len);
795 dst[len] = '\0';
796
797 return dst;
798 }
799
800 static int
801 cifs_parse_mount_options(char *options, const char *devname,
802 struct smb_vol *vol)
803 {
804 char *value;
805 char *data;
806 unsigned int temp_len, i, j;
807 char separator[2];
808 short int override_uid = -1;
809 short int override_gid = -1;
810 bool uid_specified = false;
811 bool gid_specified = false;
812
813 separator[0] = ',';
814 separator[1] = 0;
815
816 if (Local_System_Name[0] != 0)
817 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
818 else {
819 char *nodename = utsname()->nodename;
820 int n = strnlen(nodename, 15);
821 memset(vol->source_rfc1001_name, 0x20, 15);
822 for (i = 0; i < n; i++) {
823 /* does not have to be perfect mapping since field is
824 informational, only used for servers that do not support
825 port 445 and it can be overridden at mount time */
826 vol->source_rfc1001_name[i] = toupper(nodename[i]);
827 }
828 }
829 vol->source_rfc1001_name[15] = 0;
830 /* null target name indicates to use *SMBSERVR default called name
831 if we end up sending RFC1001 session initialize */
832 vol->target_rfc1001_name[0] = 0;
833 vol->linux_uid = current_uid(); /* use current_euid() instead? */
834 vol->linux_gid = current_gid();
835
836 /* default to only allowing write access to owner of the mount */
837 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
838
839 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
840 /* default is always to request posix paths. */
841 vol->posix_paths = 1;
842 /* default to using server inode numbers where available */
843 vol->server_ino = 1;
844
845 if (!options)
846 return 1;
847
848 if (strncmp(options, "sep=", 4) == 0) {
849 if (options[4] != 0) {
850 separator[0] = options[4];
851 options += 5;
852 } else {
853 cFYI(1, "Null separator not allowed");
854 }
855 }
856
857 while ((data = strsep(&options, separator)) != NULL) {
858 if (!*data)
859 continue;
860 if ((value = strchr(data, '=')) != NULL)
861 *value++ = '\0';
862
863 /* Have to parse this before we parse for "user" */
864 if (strnicmp(data, "user_xattr", 10) == 0) {
865 vol->no_xattr = 0;
866 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
867 vol->no_xattr = 1;
868 } else if (strnicmp(data, "user", 4) == 0) {
869 if (!value) {
870 printk(KERN_WARNING
871 "CIFS: invalid or missing username\n");
872 return 1; /* needs_arg; */
873 } else if (!*value) {
874 /* null user, ie anonymous, authentication */
875 vol->nullauth = 1;
876 }
877 if (strnlen(value, 200) < 200) {
878 vol->username = value;
879 } else {
880 printk(KERN_WARNING "CIFS: username too long\n");
881 return 1;
882 }
883 } else if (strnicmp(data, "pass", 4) == 0) {
884 if (!value) {
885 vol->password = NULL;
886 continue;
887 } else if (value[0] == 0) {
888 /* check if string begins with double comma
889 since that would mean the password really
890 does start with a comma, and would not
891 indicate an empty string */
892 if (value[1] != separator[0]) {
893 vol->password = NULL;
894 continue;
895 }
896 }
897 temp_len = strlen(value);
898 /* removed password length check, NTLM passwords
899 can be arbitrarily long */
900
901 /* if comma in password, the string will be
902 prematurely null terminated. Commas in password are
903 specified across the cifs mount interface by a double
904 comma ie ,, and a comma used as in other cases ie ','
905 as a parameter delimiter/separator is single and due
906 to the strsep above is temporarily zeroed. */
907
908 /* NB: password legally can have multiple commas and
909 the only illegal character in a password is null */
910
911 if ((value[temp_len] == 0) &&
912 (value[temp_len+1] == separator[0])) {
913 /* reinsert comma */
914 value[temp_len] = separator[0];
915 temp_len += 2; /* move after second comma */
916 while (value[temp_len] != 0) {
917 if (value[temp_len] == separator[0]) {
918 if (value[temp_len+1] ==
919 separator[0]) {
920 /* skip second comma */
921 temp_len++;
922 } else {
923 /* single comma indicating start
924 of next parm */
925 break;
926 }
927 }
928 temp_len++;
929 }
930 if (value[temp_len] == 0) {
931 options = NULL;
932 } else {
933 value[temp_len] = 0;
934 /* point option to start of next parm */
935 options = value + temp_len + 1;
936 }
937 /* go from value to value + temp_len condensing
938 double commas to singles. Note that this ends up
939 allocating a few bytes too many, which is ok */
940 vol->password = kzalloc(temp_len, GFP_KERNEL);
941 if (vol->password == NULL) {
942 printk(KERN_WARNING "CIFS: no memory "
943 "for password\n");
944 return 1;
945 }
946 for (i = 0, j = 0; i < temp_len; i++, j++) {
947 vol->password[j] = value[i];
948 if (value[i] == separator[0]
949 && value[i+1] == separator[0]) {
950 /* skip second comma */
951 i++;
952 }
953 }
954 vol->password[j] = 0;
955 } else {
956 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
957 if (vol->password == NULL) {
958 printk(KERN_WARNING "CIFS: no memory "
959 "for password\n");
960 return 1;
961 }
962 strcpy(vol->password, value);
963 }
964 } else if (!strnicmp(data, "ip", 2) ||
965 !strnicmp(data, "addr", 4)) {
966 if (!value || !*value) {
967 vol->UNCip = NULL;
968 } else if (strnlen(value, INET6_ADDRSTRLEN) <
969 INET6_ADDRSTRLEN) {
970 vol->UNCip = value;
971 } else {
972 printk(KERN_WARNING "CIFS: ip address "
973 "too long\n");
974 return 1;
975 }
976 } else if (strnicmp(data, "sec", 3) == 0) {
977 if (!value || !*value) {
978 cERROR(1, "no security value specified");
979 continue;
980 } else if (strnicmp(value, "krb5i", 5) == 0) {
981 vol->secFlg |= CIFSSEC_MAY_KRB5 |
982 CIFSSEC_MUST_SIGN;
983 } else if (strnicmp(value, "krb5p", 5) == 0) {
984 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
985 CIFSSEC_MAY_KRB5; */
986 cERROR(1, "Krb5 cifs privacy not supported");
987 return 1;
988 } else if (strnicmp(value, "krb5", 4) == 0) {
989 vol->secFlg |= CIFSSEC_MAY_KRB5;
990 #ifdef CONFIG_CIFS_EXPERIMENTAL
991 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
992 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
993 CIFSSEC_MUST_SIGN;
994 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
995 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
996 #endif
997 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
998 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
999 CIFSSEC_MUST_SIGN;
1000 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1001 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1002 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1003 vol->secFlg |= CIFSSEC_MAY_NTLM |
1004 CIFSSEC_MUST_SIGN;
1005 } else if (strnicmp(value, "ntlm", 4) == 0) {
1006 /* ntlm is default so can be turned off too */
1007 vol->secFlg |= CIFSSEC_MAY_NTLM;
1008 } else if (strnicmp(value, "nontlm", 6) == 0) {
1009 /* BB is there a better way to do this? */
1010 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1011 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1012 } else if (strnicmp(value, "lanman", 6) == 0) {
1013 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1014 #endif
1015 } else if (strnicmp(value, "none", 4) == 0) {
1016 vol->nullauth = 1;
1017 } else {
1018 cERROR(1, "bad security option: %s", value);
1019 return 1;
1020 }
1021 } else if ((strnicmp(data, "unc", 3) == 0)
1022 || (strnicmp(data, "target", 6) == 0)
1023 || (strnicmp(data, "path", 4) == 0)) {
1024 if (!value || !*value) {
1025 printk(KERN_WARNING "CIFS: invalid path to "
1026 "network resource\n");
1027 return 1; /* needs_arg; */
1028 }
1029 if ((temp_len = strnlen(value, 300)) < 300) {
1030 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1031 if (vol->UNC == NULL)
1032 return 1;
1033 strcpy(vol->UNC, value);
1034 if (strncmp(vol->UNC, "//", 2) == 0) {
1035 vol->UNC[0] = '\\';
1036 vol->UNC[1] = '\\';
1037 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1038 printk(KERN_WARNING
1039 "CIFS: UNC Path does not begin "
1040 "with // or \\\\ \n");
1041 return 1;
1042 }
1043 } else {
1044 printk(KERN_WARNING "CIFS: UNC name too long\n");
1045 return 1;
1046 }
1047 } else if ((strnicmp(data, "domain", 3) == 0)
1048 || (strnicmp(data, "workgroup", 5) == 0)) {
1049 if (!value || !*value) {
1050 printk(KERN_WARNING "CIFS: invalid domain name\n");
1051 return 1; /* needs_arg; */
1052 }
1053 /* BB are there cases in which a comma can be valid in
1054 a domain name and need special handling? */
1055 if (strnlen(value, 256) < 256) {
1056 vol->domainname = value;
1057 cFYI(1, "Domain name set");
1058 } else {
1059 printk(KERN_WARNING "CIFS: domain name too "
1060 "long\n");
1061 return 1;
1062 }
1063 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1064 if (!value || !*value) {
1065 printk(KERN_WARNING
1066 "CIFS: invalid path prefix\n");
1067 return 1; /* needs_argument */
1068 }
1069 if ((temp_len = strnlen(value, 1024)) < 1024) {
1070 if (value[0] != '/')
1071 temp_len++; /* missing leading slash */
1072 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1073 if (vol->prepath == NULL)
1074 return 1;
1075 if (value[0] != '/') {
1076 vol->prepath[0] = '/';
1077 strcpy(vol->prepath+1, value);
1078 } else
1079 strcpy(vol->prepath, value);
1080 cFYI(1, "prefix path %s", vol->prepath);
1081 } else {
1082 printk(KERN_WARNING "CIFS: prefix too long\n");
1083 return 1;
1084 }
1085 } else if (strnicmp(data, "iocharset", 9) == 0) {
1086 if (!value || !*value) {
1087 printk(KERN_WARNING "CIFS: invalid iocharset "
1088 "specified\n");
1089 return 1; /* needs_arg; */
1090 }
1091 if (strnlen(value, 65) < 65) {
1092 if (strnicmp(value, "default", 7))
1093 vol->iocharset = value;
1094 /* if iocharset not set then load_nls_default
1095 is used by caller */
1096 cFYI(1, "iocharset set to %s", value);
1097 } else {
1098 printk(KERN_WARNING "CIFS: iocharset name "
1099 "too long.\n");
1100 return 1;
1101 }
1102 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1103 vol->linux_uid = simple_strtoul(value, &value, 0);
1104 uid_specified = true;
1105 } else if (!strnicmp(data, "forceuid", 8)) {
1106 override_uid = 1;
1107 } else if (!strnicmp(data, "noforceuid", 10)) {
1108 override_uid = 0;
1109 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1110 vol->linux_gid = simple_strtoul(value, &value, 0);
1111 gid_specified = true;
1112 } else if (!strnicmp(data, "forcegid", 8)) {
1113 override_gid = 1;
1114 } else if (!strnicmp(data, "noforcegid", 10)) {
1115 override_gid = 0;
1116 } else if (strnicmp(data, "file_mode", 4) == 0) {
1117 if (value && *value) {
1118 vol->file_mode =
1119 simple_strtoul(value, &value, 0);
1120 }
1121 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1122 if (value && *value) {
1123 vol->dir_mode =
1124 simple_strtoul(value, &value, 0);
1125 }
1126 } else if (strnicmp(data, "dirmode", 4) == 0) {
1127 if (value && *value) {
1128 vol->dir_mode =
1129 simple_strtoul(value, &value, 0);
1130 }
1131 } else if (strnicmp(data, "port", 4) == 0) {
1132 if (value && *value) {
1133 vol->port =
1134 simple_strtoul(value, &value, 0);
1135 }
1136 } else if (strnicmp(data, "rsize", 5) == 0) {
1137 if (value && *value) {
1138 vol->rsize =
1139 simple_strtoul(value, &value, 0);
1140 }
1141 } else if (strnicmp(data, "wsize", 5) == 0) {
1142 if (value && *value) {
1143 vol->wsize =
1144 simple_strtoul(value, &value, 0);
1145 }
1146 } else if (strnicmp(data, "sockopt", 5) == 0) {
1147 if (!value || !*value) {
1148 cERROR(1, "no socket option specified");
1149 continue;
1150 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1151 vol->sockopt_tcp_nodelay = 1;
1152 }
1153 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1154 if (!value || !*value || (*value == ' ')) {
1155 cFYI(1, "invalid (empty) netbiosname");
1156 } else {
1157 memset(vol->source_rfc1001_name, 0x20, 15);
1158 for (i = 0; i < 15; i++) {
1159 /* BB are there cases in which a comma can be
1160 valid in this workstation netbios name (and need
1161 special handling)? */
1162
1163 /* We do not uppercase netbiosname for user */
1164 if (value[i] == 0)
1165 break;
1166 else
1167 vol->source_rfc1001_name[i] =
1168 value[i];
1169 }
1170 /* The string has 16th byte zero still from
1171 set at top of the function */
1172 if ((i == 15) && (value[i] != 0))
1173 printk(KERN_WARNING "CIFS: netbiosname"
1174 " longer than 15 truncated.\n");
1175 }
1176 } else if (strnicmp(data, "servern", 7) == 0) {
1177 /* servernetbiosname specified override *SMBSERVER */
1178 if (!value || !*value || (*value == ' ')) {
1179 cFYI(1, "empty server netbiosname specified");
1180 } else {
1181 /* last byte, type, is 0x20 for servr type */
1182 memset(vol->target_rfc1001_name, 0x20, 16);
1183
1184 for (i = 0; i < 15; i++) {
1185 /* BB are there cases in which a comma can be
1186 valid in this workstation netbios name
1187 (and need special handling)? */
1188
1189 /* user or mount helper must uppercase
1190 the netbiosname */
1191 if (value[i] == 0)
1192 break;
1193 else
1194 vol->target_rfc1001_name[i] =
1195 value[i];
1196 }
1197 /* The string has 16th byte zero still from
1198 set at top of the function */
1199 if ((i == 15) && (value[i] != 0))
1200 printk(KERN_WARNING "CIFS: server net"
1201 "biosname longer than 15 truncated.\n");
1202 }
1203 } else if (strnicmp(data, "credentials", 4) == 0) {
1204 /* ignore */
1205 } else if (strnicmp(data, "version", 3) == 0) {
1206 /* ignore */
1207 } else if (strnicmp(data, "guest", 5) == 0) {
1208 /* ignore */
1209 } else if (strnicmp(data, "rw", 2) == 0) {
1210 /* ignore */
1211 } else if (strnicmp(data, "ro", 2) == 0) {
1212 /* ignore */
1213 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1214 vol->noblocksnd = 1;
1215 } else if (strnicmp(data, "noautotune", 10) == 0) {
1216 vol->noautotune = 1;
1217 } else if ((strnicmp(data, "suid", 4) == 0) ||
1218 (strnicmp(data, "nosuid", 6) == 0) ||
1219 (strnicmp(data, "exec", 4) == 0) ||
1220 (strnicmp(data, "noexec", 6) == 0) ||
1221 (strnicmp(data, "nodev", 5) == 0) ||
1222 (strnicmp(data, "noauto", 6) == 0) ||
1223 (strnicmp(data, "dev", 3) == 0)) {
1224 /* The mount tool or mount.cifs helper (if present)
1225 uses these opts to set flags, and the flags are read
1226 by the kernel vfs layer before we get here (ie
1227 before read super) so there is no point trying to
1228 parse these options again and set anything and it
1229 is ok to just ignore them */
1230 continue;
1231 } else if (strnicmp(data, "hard", 4) == 0) {
1232 vol->retry = 1;
1233 } else if (strnicmp(data, "soft", 4) == 0) {
1234 vol->retry = 0;
1235 } else if (strnicmp(data, "perm", 4) == 0) {
1236 vol->noperm = 0;
1237 } else if (strnicmp(data, "noperm", 6) == 0) {
1238 vol->noperm = 1;
1239 } else if (strnicmp(data, "mapchars", 8) == 0) {
1240 vol->remap = 1;
1241 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1242 vol->remap = 0;
1243 } else if (strnicmp(data, "sfu", 3) == 0) {
1244 vol->sfu_emul = 1;
1245 } else if (strnicmp(data, "nosfu", 5) == 0) {
1246 vol->sfu_emul = 0;
1247 } else if (strnicmp(data, "nodfs", 5) == 0) {
1248 vol->nodfs = 1;
1249 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1250 vol->posix_paths = 1;
1251 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1252 vol->posix_paths = 0;
1253 } else if (strnicmp(data, "nounix", 6) == 0) {
1254 vol->no_linux_ext = 1;
1255 } else if (strnicmp(data, "nolinux", 7) == 0) {
1256 vol->no_linux_ext = 1;
1257 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1258 (strnicmp(data, "ignorecase", 10) == 0)) {
1259 vol->nocase = 1;
1260 } else if (strnicmp(data, "brl", 3) == 0) {
1261 vol->nobrl = 0;
1262 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1263 (strnicmp(data, "nolock", 6) == 0)) {
1264 vol->nobrl = 1;
1265 /* turn off mandatory locking in mode
1266 if remote locking is turned off since the
1267 local vfs will do advisory */
1268 if (vol->file_mode ==
1269 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1270 vol->file_mode = S_IALLUGO;
1271 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1272 /* will take the shorter form "forcemand" as well */
1273 /* This mount option will force use of mandatory
1274 (DOS/Windows style) byte range locks, instead of
1275 using posix advisory byte range locks, even if the
1276 Unix extensions are available and posix locks would
1277 be supported otherwise. If Unix extensions are not
1278 negotiated this has no effect since mandatory locks
1279 would be used (mandatory locks is all that those
1280 those servers support) */
1281 vol->mand_lock = 1;
1282 } else if (strnicmp(data, "setuids", 7) == 0) {
1283 vol->setuids = 1;
1284 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1285 vol->setuids = 0;
1286 } else if (strnicmp(data, "dynperm", 7) == 0) {
1287 vol->dynperm = true;
1288 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1289 vol->dynperm = false;
1290 } else if (strnicmp(data, "nohard", 6) == 0) {
1291 vol->retry = 0;
1292 } else if (strnicmp(data, "nosoft", 6) == 0) {
1293 vol->retry = 1;
1294 } else if (strnicmp(data, "nointr", 6) == 0) {
1295 vol->intr = 0;
1296 } else if (strnicmp(data, "intr", 4) == 0) {
1297 vol->intr = 1;
1298 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1299 vol->nostrictsync = 1;
1300 } else if (strnicmp(data, "strictsync", 10) == 0) {
1301 vol->nostrictsync = 0;
1302 } else if (strnicmp(data, "serverino", 7) == 0) {
1303 vol->server_ino = 1;
1304 } else if (strnicmp(data, "noserverino", 9) == 0) {
1305 vol->server_ino = 0;
1306 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1307 vol->cifs_acl = 1;
1308 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1309 vol->cifs_acl = 0;
1310 } else if (strnicmp(data, "acl", 3) == 0) {
1311 vol->no_psx_acl = 0;
1312 } else if (strnicmp(data, "noacl", 5) == 0) {
1313 vol->no_psx_acl = 1;
1314 #ifdef CONFIG_CIFS_EXPERIMENTAL
1315 } else if (strnicmp(data, "locallease", 6) == 0) {
1316 vol->local_lease = 1;
1317 #endif
1318 } else if (strnicmp(data, "sign", 4) == 0) {
1319 vol->secFlg |= CIFSSEC_MUST_SIGN;
1320 } else if (strnicmp(data, "seal", 4) == 0) {
1321 /* we do not do the following in secFlags because seal
1322 is a per tree connection (mount) not a per socket
1323 or per-smb connection option in the protocol */
1324 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1325 vol->seal = 1;
1326 } else if (strnicmp(data, "direct", 6) == 0) {
1327 vol->direct_io = 1;
1328 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1329 vol->direct_io = 1;
1330 } else if (strnicmp(data, "noac", 4) == 0) {
1331 printk(KERN_WARNING "CIFS: Mount option noac not "
1332 "supported. Instead set "
1333 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1334 } else
1335 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1336 data);
1337 }
1338 if (vol->UNC == NULL) {
1339 if (devname == NULL) {
1340 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1341 "target\n");
1342 return 1;
1343 }
1344 if ((temp_len = strnlen(devname, 300)) < 300) {
1345 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1346 if (vol->UNC == NULL)
1347 return 1;
1348 strcpy(vol->UNC, devname);
1349 if (strncmp(vol->UNC, "//", 2) == 0) {
1350 vol->UNC[0] = '\\';
1351 vol->UNC[1] = '\\';
1352 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1353 printk(KERN_WARNING "CIFS: UNC Path does not "
1354 "begin with // or \\\\ \n");
1355 return 1;
1356 }
1357 value = strpbrk(vol->UNC+2, "/\\");
1358 if (value)
1359 *value = '\\';
1360 } else {
1361 printk(KERN_WARNING "CIFS: UNC name too long\n");
1362 return 1;
1363 }
1364 }
1365 if (vol->UNCip == NULL)
1366 vol->UNCip = &vol->UNC[2];
1367
1368 if (uid_specified)
1369 vol->override_uid = override_uid;
1370 else if (override_uid == 1)
1371 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1372 "specified with no uid= option.\n");
1373
1374 if (gid_specified)
1375 vol->override_gid = override_gid;
1376 else if (override_gid == 1)
1377 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1378 "specified with no gid= option.\n");
1379
1380 return 0;
1381 }
1382
1383 static struct TCP_Server_Info *
1384 cifs_find_tcp_session(struct sockaddr_storage *addr, unsigned short int port)
1385 {
1386 struct list_head *tmp;
1387 struct TCP_Server_Info *server;
1388 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1389 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1390
1391 write_lock(&cifs_tcp_ses_lock);
1392 list_for_each(tmp, &cifs_tcp_ses_list) {
1393 server = list_entry(tmp, struct TCP_Server_Info,
1394 tcp_ses_list);
1395 /*
1396 * the demux thread can exit on its own while still in CifsNew
1397 * so don't accept any sockets in that state. Since the
1398 * tcpStatus never changes back to CifsNew it's safe to check
1399 * for this without a lock.
1400 */
1401 if (server->tcpStatus == CifsNew)
1402 continue;
1403
1404 switch (addr->ss_family) {
1405 case AF_INET:
1406 if (addr4->sin_addr.s_addr ==
1407 server->addr.sockAddr.sin_addr.s_addr) {
1408 addr4->sin_port = htons(port);
1409 /* user overrode default port? */
1410 if (addr4->sin_port) {
1411 if (addr4->sin_port !=
1412 server->addr.sockAddr.sin_port)
1413 continue;
1414 }
1415 break;
1416 } else
1417 continue;
1418
1419 case AF_INET6:
1420 if (ipv6_addr_equal(&addr6->sin6_addr,
1421 &server->addr.sockAddr6.sin6_addr) &&
1422 (addr6->sin6_scope_id ==
1423 server->addr.sockAddr6.sin6_scope_id)) {
1424 addr6->sin6_port = htons(port);
1425 /* user overrode default port? */
1426 if (addr6->sin6_port) {
1427 if (addr6->sin6_port !=
1428 server->addr.sockAddr6.sin6_port)
1429 continue;
1430 }
1431 break;
1432 } else
1433 continue;
1434 }
1435
1436 ++server->srv_count;
1437 write_unlock(&cifs_tcp_ses_lock);
1438 cFYI(1, "Existing tcp session with server found");
1439 return server;
1440 }
1441 write_unlock(&cifs_tcp_ses_lock);
1442 return NULL;
1443 }
1444
1445 static void
1446 cifs_put_tcp_session(struct TCP_Server_Info *server)
1447 {
1448 struct task_struct *task;
1449
1450 write_lock(&cifs_tcp_ses_lock);
1451 if (--server->srv_count > 0) {
1452 write_unlock(&cifs_tcp_ses_lock);
1453 return;
1454 }
1455
1456 list_del_init(&server->tcp_ses_list);
1457 write_unlock(&cifs_tcp_ses_lock);
1458
1459 spin_lock(&GlobalMid_Lock);
1460 server->tcpStatus = CifsExiting;
1461 spin_unlock(&GlobalMid_Lock);
1462
1463 task = xchg(&server->tsk, NULL);
1464 if (task)
1465 force_sig(SIGKILL, task);
1466 }
1467
1468 static struct TCP_Server_Info *
1469 cifs_get_tcp_session(struct smb_vol *volume_info)
1470 {
1471 struct TCP_Server_Info *tcp_ses = NULL;
1472 struct sockaddr_storage addr;
1473 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1474 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1475 int rc;
1476
1477 memset(&addr, 0, sizeof(struct sockaddr_storage));
1478
1479 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1480
1481 if (volume_info->UNCip && volume_info->UNC) {
1482 rc = cifs_convert_address(volume_info->UNCip, &addr);
1483 if (!rc) {
1484 /* we failed translating address */
1485 rc = -EINVAL;
1486 goto out_err;
1487 }
1488 } else if (volume_info->UNCip) {
1489 /* BB using ip addr as tcp_ses name to connect to the
1490 DFS root below */
1491 cERROR(1, "Connecting to DFS root not implemented yet");
1492 rc = -EINVAL;
1493 goto out_err;
1494 } else /* which tcp_sess DFS root would we conect to */ {
1495 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1496 "unc=//192.168.1.100/public) specified");
1497 rc = -EINVAL;
1498 goto out_err;
1499 }
1500
1501 /* see if we already have a matching tcp_ses */
1502 tcp_ses = cifs_find_tcp_session(&addr, volume_info->port);
1503 if (tcp_ses)
1504 return tcp_ses;
1505
1506 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1507 if (!tcp_ses) {
1508 rc = -ENOMEM;
1509 goto out_err;
1510 }
1511
1512 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1513 if (IS_ERR(tcp_ses->hostname)) {
1514 rc = PTR_ERR(tcp_ses->hostname);
1515 goto out_err;
1516 }
1517
1518 tcp_ses->noblocksnd = volume_info->noblocksnd;
1519 tcp_ses->noautotune = volume_info->noautotune;
1520 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1521 atomic_set(&tcp_ses->inFlight, 0);
1522 init_waitqueue_head(&tcp_ses->response_q);
1523 init_waitqueue_head(&tcp_ses->request_q);
1524 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1525 mutex_init(&tcp_ses->srv_mutex);
1526 memcpy(tcp_ses->workstation_RFC1001_name,
1527 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1528 memcpy(tcp_ses->server_RFC1001_name,
1529 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1530 tcp_ses->sequence_number = 0;
1531 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1532 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1533
1534 /*
1535 * at this point we are the only ones with the pointer
1536 * to the struct since the kernel thread not created yet
1537 * no need to spinlock this init of tcpStatus or srv_count
1538 */
1539 tcp_ses->tcpStatus = CifsNew;
1540 ++tcp_ses->srv_count;
1541
1542 if (addr.ss_family == AF_INET6) {
1543 cFYI(1, "attempting ipv6 connect");
1544 /* BB should we allow ipv6 on port 139? */
1545 /* other OS never observed in Wild doing 139 with v6 */
1546 sin_server6->sin6_port = htons(volume_info->port);
1547 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1548 sizeof(struct sockaddr_in6));
1549 rc = ipv6_connect(tcp_ses);
1550 } else {
1551 sin_server->sin_port = htons(volume_info->port);
1552 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1553 sizeof(struct sockaddr_in));
1554 rc = ipv4_connect(tcp_ses);
1555 }
1556 if (rc < 0) {
1557 cERROR(1, "Error connecting to socket. Aborting operation");
1558 goto out_err;
1559 }
1560
1561 /*
1562 * since we're in a cifs function already, we know that
1563 * this will succeed. No need for try_module_get().
1564 */
1565 __module_get(THIS_MODULE);
1566 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1567 tcp_ses, "cifsd");
1568 if (IS_ERR(tcp_ses->tsk)) {
1569 rc = PTR_ERR(tcp_ses->tsk);
1570 cERROR(1, "error %d create cifsd thread", rc);
1571 module_put(THIS_MODULE);
1572 goto out_err;
1573 }
1574
1575 /* thread spawned, put it on the list */
1576 write_lock(&cifs_tcp_ses_lock);
1577 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1578 write_unlock(&cifs_tcp_ses_lock);
1579
1580 return tcp_ses;
1581
1582 out_err:
1583 if (tcp_ses) {
1584 if (!IS_ERR(tcp_ses->hostname))
1585 kfree(tcp_ses->hostname);
1586 if (tcp_ses->ssocket)
1587 sock_release(tcp_ses->ssocket);
1588 kfree(tcp_ses);
1589 }
1590 return ERR_PTR(rc);
1591 }
1592
1593 static struct cifsSesInfo *
1594 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1595 {
1596 struct list_head *tmp;
1597 struct cifsSesInfo *ses;
1598
1599 write_lock(&cifs_tcp_ses_lock);
1600 list_for_each(tmp, &server->smb_ses_list) {
1601 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1602 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1603 continue;
1604
1605 ++ses->ses_count;
1606 write_unlock(&cifs_tcp_ses_lock);
1607 return ses;
1608 }
1609 write_unlock(&cifs_tcp_ses_lock);
1610 return NULL;
1611 }
1612
1613 static void
1614 cifs_put_smb_ses(struct cifsSesInfo *ses)
1615 {
1616 int xid;
1617 struct TCP_Server_Info *server = ses->server;
1618
1619 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1620 write_lock(&cifs_tcp_ses_lock);
1621 if (--ses->ses_count > 0) {
1622 write_unlock(&cifs_tcp_ses_lock);
1623 return;
1624 }
1625
1626 list_del_init(&ses->smb_ses_list);
1627 write_unlock(&cifs_tcp_ses_lock);
1628
1629 if (ses->status == CifsGood) {
1630 xid = GetXid();
1631 CIFSSMBLogoff(xid, ses);
1632 _FreeXid(xid);
1633 }
1634 sesInfoFree(ses);
1635 cifs_put_tcp_session(server);
1636 }
1637
1638 static struct cifsSesInfo *
1639 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1640 {
1641 int rc = -ENOMEM, xid;
1642 struct cifsSesInfo *ses;
1643
1644 xid = GetXid();
1645
1646 ses = cifs_find_smb_ses(server, volume_info->username);
1647 if (ses) {
1648 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1649
1650 /* existing SMB ses has a server reference already */
1651 cifs_put_tcp_session(server);
1652
1653 mutex_lock(&ses->session_mutex);
1654 if (ses->need_reconnect) {
1655 cFYI(1, "Session needs reconnect");
1656 rc = cifs_setup_session(xid, ses,
1657 volume_info->local_nls);
1658 if (rc) {
1659 mutex_unlock(&ses->session_mutex);
1660 /* problem -- put our reference */
1661 cifs_put_smb_ses(ses);
1662 FreeXid(xid);
1663 return ERR_PTR(rc);
1664 }
1665 }
1666 mutex_unlock(&ses->session_mutex);
1667 FreeXid(xid);
1668 return ses;
1669 }
1670
1671 cFYI(1, "Existing smb sess not found");
1672 ses = sesInfoAlloc();
1673 if (ses == NULL)
1674 goto get_ses_fail;
1675
1676 /* new SMB session uses our server ref */
1677 ses->server = server;
1678 if (server->addr.sockAddr6.sin6_family == AF_INET6)
1679 sprintf(ses->serverName, "%pI6",
1680 &server->addr.sockAddr6.sin6_addr);
1681 else
1682 sprintf(ses->serverName, "%pI4",
1683 &server->addr.sockAddr.sin_addr.s_addr);
1684
1685 if (volume_info->username)
1686 strncpy(ses->userName, volume_info->username,
1687 MAX_USERNAME_SIZE);
1688
1689 /* volume_info->password freed at unmount */
1690 if (volume_info->password) {
1691 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1692 if (!ses->password)
1693 goto get_ses_fail;
1694 }
1695 if (volume_info->domainname) {
1696 int len = strlen(volume_info->domainname);
1697 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1698 if (ses->domainName)
1699 strcpy(ses->domainName, volume_info->domainname);
1700 }
1701 ses->linux_uid = volume_info->linux_uid;
1702 ses->overrideSecFlg = volume_info->secFlg;
1703
1704 mutex_lock(&ses->session_mutex);
1705 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1706 mutex_unlock(&ses->session_mutex);
1707 if (rc)
1708 goto get_ses_fail;
1709
1710 /* success, put it on the list */
1711 write_lock(&cifs_tcp_ses_lock);
1712 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1713 write_unlock(&cifs_tcp_ses_lock);
1714
1715 FreeXid(xid);
1716 return ses;
1717
1718 get_ses_fail:
1719 sesInfoFree(ses);
1720 FreeXid(xid);
1721 return ERR_PTR(rc);
1722 }
1723
1724 static struct cifsTconInfo *
1725 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1726 {
1727 struct list_head *tmp;
1728 struct cifsTconInfo *tcon;
1729
1730 write_lock(&cifs_tcp_ses_lock);
1731 list_for_each(tmp, &ses->tcon_list) {
1732 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1733 if (tcon->tidStatus == CifsExiting)
1734 continue;
1735 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1736 continue;
1737
1738 ++tcon->tc_count;
1739 write_unlock(&cifs_tcp_ses_lock);
1740 return tcon;
1741 }
1742 write_unlock(&cifs_tcp_ses_lock);
1743 return NULL;
1744 }
1745
1746 static void
1747 cifs_put_tcon(struct cifsTconInfo *tcon)
1748 {
1749 int xid;
1750 struct cifsSesInfo *ses = tcon->ses;
1751
1752 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1753 write_lock(&cifs_tcp_ses_lock);
1754 if (--tcon->tc_count > 0) {
1755 write_unlock(&cifs_tcp_ses_lock);
1756 return;
1757 }
1758
1759 list_del_init(&tcon->tcon_list);
1760 write_unlock(&cifs_tcp_ses_lock);
1761
1762 xid = GetXid();
1763 CIFSSMBTDis(xid, tcon);
1764 _FreeXid(xid);
1765
1766 tconInfoFree(tcon);
1767 cifs_put_smb_ses(ses);
1768 }
1769
1770 static struct cifsTconInfo *
1771 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1772 {
1773 int rc, xid;
1774 struct cifsTconInfo *tcon;
1775
1776 tcon = cifs_find_tcon(ses, volume_info->UNC);
1777 if (tcon) {
1778 cFYI(1, "Found match on UNC path");
1779 /* existing tcon already has a reference */
1780 cifs_put_smb_ses(ses);
1781 if (tcon->seal != volume_info->seal)
1782 cERROR(1, "transport encryption setting "
1783 "conflicts with existing tid");
1784 return tcon;
1785 }
1786
1787 tcon = tconInfoAlloc();
1788 if (tcon == NULL) {
1789 rc = -ENOMEM;
1790 goto out_fail;
1791 }
1792
1793 tcon->ses = ses;
1794 if (volume_info->password) {
1795 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1796 if (!tcon->password) {
1797 rc = -ENOMEM;
1798 goto out_fail;
1799 }
1800 }
1801
1802 if (strchr(volume_info->UNC + 3, '\\') == NULL
1803 && strchr(volume_info->UNC + 3, '/') == NULL) {
1804 cERROR(1, "Missing share name");
1805 rc = -ENODEV;
1806 goto out_fail;
1807 }
1808
1809 /* BB Do we need to wrap session_mutex around
1810 * this TCon call and Unix SetFS as
1811 * we do on SessSetup and reconnect? */
1812 xid = GetXid();
1813 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1814 FreeXid(xid);
1815 cFYI(1, "CIFS Tcon rc = %d", rc);
1816 if (rc)
1817 goto out_fail;
1818
1819 if (volume_info->nodfs) {
1820 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1821 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1822 }
1823 tcon->seal = volume_info->seal;
1824 /* we can have only one retry value for a connection
1825 to a share so for resources mounted more than once
1826 to the same server share the last value passed in
1827 for the retry flag is used */
1828 tcon->retry = volume_info->retry;
1829 tcon->nocase = volume_info->nocase;
1830 tcon->local_lease = volume_info->local_lease;
1831
1832 write_lock(&cifs_tcp_ses_lock);
1833 list_add(&tcon->tcon_list, &ses->tcon_list);
1834 write_unlock(&cifs_tcp_ses_lock);
1835
1836 return tcon;
1837
1838 out_fail:
1839 tconInfoFree(tcon);
1840 return ERR_PTR(rc);
1841 }
1842
1843
1844 int
1845 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1846 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1847 struct dfs_info3_param **preferrals, int remap)
1848 {
1849 char *temp_unc;
1850 int rc = 0;
1851
1852 *pnum_referrals = 0;
1853 *preferrals = NULL;
1854
1855 if (pSesInfo->ipc_tid == 0) {
1856 temp_unc = kmalloc(2 /* for slashes */ +
1857 strnlen(pSesInfo->serverName,
1858 SERVER_NAME_LEN_WITH_NULL * 2)
1859 + 1 + 4 /* slash IPC$ */ + 2,
1860 GFP_KERNEL);
1861 if (temp_unc == NULL)
1862 return -ENOMEM;
1863 temp_unc[0] = '\\';
1864 temp_unc[1] = '\\';
1865 strcpy(temp_unc + 2, pSesInfo->serverName);
1866 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1867 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1868 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1869 kfree(temp_unc);
1870 }
1871 if (rc == 0)
1872 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1873 pnum_referrals, nls_codepage, remap);
1874 /* BB map targetUNCs to dfs_info3 structures, here or
1875 in CIFSGetDFSRefer BB */
1876
1877 return rc;
1878 }
1879
1880 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1881 static struct lock_class_key cifs_key[2];
1882 static struct lock_class_key cifs_slock_key[2];
1883
1884 static inline void
1885 cifs_reclassify_socket4(struct socket *sock)
1886 {
1887 struct sock *sk = sock->sk;
1888 BUG_ON(sock_owned_by_user(sk));
1889 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1890 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1891 }
1892
1893 static inline void
1894 cifs_reclassify_socket6(struct socket *sock)
1895 {
1896 struct sock *sk = sock->sk;
1897 BUG_ON(sock_owned_by_user(sk));
1898 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1899 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1900 }
1901 #else
1902 static inline void
1903 cifs_reclassify_socket4(struct socket *sock)
1904 {
1905 }
1906
1907 static inline void
1908 cifs_reclassify_socket6(struct socket *sock)
1909 {
1910 }
1911 #endif
1912
1913 /* See RFC1001 section 14 on representation of Netbios names */
1914 static void rfc1002mangle(char *target, char *source, unsigned int length)
1915 {
1916 unsigned int i, j;
1917
1918 for (i = 0, j = 0; i < (length); i++) {
1919 /* mask a nibble at a time and encode */
1920 target[j] = 'A' + (0x0F & (source[i] >> 4));
1921 target[j+1] = 'A' + (0x0F & source[i]);
1922 j += 2;
1923 }
1924
1925 }
1926
1927
1928 static int
1929 ipv4_connect(struct TCP_Server_Info *server)
1930 {
1931 int rc = 0;
1932 int val;
1933 bool connected = false;
1934 __be16 orig_port = 0;
1935 struct socket *socket = server->ssocket;
1936
1937 if (socket == NULL) {
1938 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1939 IPPROTO_TCP, &socket);
1940 if (rc < 0) {
1941 cERROR(1, "Error %d creating socket", rc);
1942 return rc;
1943 }
1944
1945 /* BB other socket options to set KEEPALIVE, NODELAY? */
1946 cFYI(1, "Socket created");
1947 server->ssocket = socket;
1948 socket->sk->sk_allocation = GFP_NOFS;
1949 cifs_reclassify_socket4(socket);
1950 }
1951
1952 /* user overrode default port */
1953 if (server->addr.sockAddr.sin_port) {
1954 rc = socket->ops->connect(socket, (struct sockaddr *)
1955 &server->addr.sockAddr,
1956 sizeof(struct sockaddr_in), 0);
1957 if (rc >= 0)
1958 connected = true;
1959 }
1960
1961 if (!connected) {
1962 /* save original port so we can retry user specified port
1963 later if fall back ports fail this time */
1964 orig_port = server->addr.sockAddr.sin_port;
1965
1966 /* do not retry on the same port we just failed on */
1967 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1968 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1969 rc = socket->ops->connect(socket,
1970 (struct sockaddr *)
1971 &server->addr.sockAddr,
1972 sizeof(struct sockaddr_in), 0);
1973 if (rc >= 0)
1974 connected = true;
1975 }
1976 }
1977 if (!connected) {
1978 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1979 rc = socket->ops->connect(socket, (struct sockaddr *)
1980 &server->addr.sockAddr,
1981 sizeof(struct sockaddr_in), 0);
1982 if (rc >= 0)
1983 connected = true;
1984 }
1985
1986 /* give up here - unless we want to retry on different
1987 protocol families some day */
1988 if (!connected) {
1989 if (orig_port)
1990 server->addr.sockAddr.sin_port = orig_port;
1991 cFYI(1, "Error %d connecting to server via ipv4", rc);
1992 sock_release(socket);
1993 server->ssocket = NULL;
1994 return rc;
1995 }
1996
1997
1998 /*
1999 * Eventually check for other socket options to change from
2000 * the default. sock_setsockopt not used because it expects
2001 * user space buffer
2002 */
2003 socket->sk->sk_rcvtimeo = 7 * HZ;
2004 socket->sk->sk_sndtimeo = 5 * HZ;
2005
2006 /* make the bufsizes depend on wsize/rsize and max requests */
2007 if (server->noautotune) {
2008 if (socket->sk->sk_sndbuf < (200 * 1024))
2009 socket->sk->sk_sndbuf = 200 * 1024;
2010 if (socket->sk->sk_rcvbuf < (140 * 1024))
2011 socket->sk->sk_rcvbuf = 140 * 1024;
2012 }
2013
2014 if (server->tcp_nodelay) {
2015 val = 1;
2016 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2017 (char *)&val, sizeof(val));
2018 if (rc)
2019 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2020 }
2021
2022 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2023 socket->sk->sk_sndbuf,
2024 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2025
2026 /* send RFC1001 sessinit */
2027 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2028 /* some servers require RFC1001 sessinit before sending
2029 negprot - BB check reconnection in case where second
2030 sessinit is sent but no second negprot */
2031 struct rfc1002_session_packet *ses_init_buf;
2032 struct smb_hdr *smb_buf;
2033 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2034 GFP_KERNEL);
2035 if (ses_init_buf) {
2036 ses_init_buf->trailer.session_req.called_len = 32;
2037 if (server->server_RFC1001_name &&
2038 server->server_RFC1001_name[0] != 0)
2039 rfc1002mangle(ses_init_buf->trailer.
2040 session_req.called_name,
2041 server->server_RFC1001_name,
2042 RFC1001_NAME_LEN_WITH_NULL);
2043 else
2044 rfc1002mangle(ses_init_buf->trailer.
2045 session_req.called_name,
2046 DEFAULT_CIFS_CALLED_NAME,
2047 RFC1001_NAME_LEN_WITH_NULL);
2048
2049 ses_init_buf->trailer.session_req.calling_len = 32;
2050
2051 /* calling name ends in null (byte 16) from old smb
2052 convention. */
2053 if (server->workstation_RFC1001_name &&
2054 server->workstation_RFC1001_name[0] != 0)
2055 rfc1002mangle(ses_init_buf->trailer.
2056 session_req.calling_name,
2057 server->workstation_RFC1001_name,
2058 RFC1001_NAME_LEN_WITH_NULL);
2059 else
2060 rfc1002mangle(ses_init_buf->trailer.
2061 session_req.calling_name,
2062 "LINUX_CIFS_CLNT",
2063 RFC1001_NAME_LEN_WITH_NULL);
2064
2065 ses_init_buf->trailer.session_req.scope1 = 0;
2066 ses_init_buf->trailer.session_req.scope2 = 0;
2067 smb_buf = (struct smb_hdr *)ses_init_buf;
2068 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2069 smb_buf->smb_buf_length = 0x81000044;
2070 rc = smb_send(server, smb_buf, 0x44);
2071 kfree(ses_init_buf);
2072 msleep(1); /* RFC1001 layer in at least one server
2073 requires very short break before negprot
2074 presumably because not expecting negprot
2075 to follow so fast. This is a simple
2076 solution that works without
2077 complicating the code and causes no
2078 significant slowing down on mount
2079 for everyone else */
2080 }
2081 /* else the negprot may still work without this
2082 even though malloc failed */
2083
2084 }
2085
2086 return rc;
2087 }
2088
2089 static int
2090 ipv6_connect(struct TCP_Server_Info *server)
2091 {
2092 int rc = 0;
2093 int val;
2094 bool connected = false;
2095 __be16 orig_port = 0;
2096 struct socket *socket = server->ssocket;
2097
2098 if (socket == NULL) {
2099 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2100 IPPROTO_TCP, &socket);
2101 if (rc < 0) {
2102 cERROR(1, "Error %d creating ipv6 socket", rc);
2103 socket = NULL;
2104 return rc;
2105 }
2106
2107 /* BB other socket options to set KEEPALIVE, NODELAY? */
2108 cFYI(1, "ipv6 Socket created");
2109 server->ssocket = socket;
2110 socket->sk->sk_allocation = GFP_NOFS;
2111 cifs_reclassify_socket6(socket);
2112 }
2113
2114 /* user overrode default port */
2115 if (server->addr.sockAddr6.sin6_port) {
2116 rc = socket->ops->connect(socket,
2117 (struct sockaddr *) &server->addr.sockAddr6,
2118 sizeof(struct sockaddr_in6), 0);
2119 if (rc >= 0)
2120 connected = true;
2121 }
2122
2123 if (!connected) {
2124 /* save original port so we can retry user specified port
2125 later if fall back ports fail this time */
2126
2127 orig_port = server->addr.sockAddr6.sin6_port;
2128 /* do not retry on the same port we just failed on */
2129 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2130 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2131 rc = socket->ops->connect(socket, (struct sockaddr *)
2132 &server->addr.sockAddr6,
2133 sizeof(struct sockaddr_in6), 0);
2134 if (rc >= 0)
2135 connected = true;
2136 }
2137 }
2138 if (!connected) {
2139 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2140 rc = socket->ops->connect(socket, (struct sockaddr *)
2141 &server->addr.sockAddr6,
2142 sizeof(struct sockaddr_in6), 0);
2143 if (rc >= 0)
2144 connected = true;
2145 }
2146
2147 /* give up here - unless we want to retry on different
2148 protocol families some day */
2149 if (!connected) {
2150 if (orig_port)
2151 server->addr.sockAddr6.sin6_port = orig_port;
2152 cFYI(1, "Error %d connecting to server via ipv6", rc);
2153 sock_release(socket);
2154 server->ssocket = NULL;
2155 return rc;
2156 }
2157
2158 /*
2159 * Eventually check for other socket options to change from
2160 * the default. sock_setsockopt not used because it expects
2161 * user space buffer
2162 */
2163 socket->sk->sk_rcvtimeo = 7 * HZ;
2164 socket->sk->sk_sndtimeo = 5 * HZ;
2165
2166 if (server->tcp_nodelay) {
2167 val = 1;
2168 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2169 (char *)&val, sizeof(val));
2170 if (rc)
2171 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2172 }
2173
2174 server->ssocket = socket;
2175
2176 return rc;
2177 }
2178
2179 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2180 struct super_block *sb, struct smb_vol *vol_info)
2181 {
2182 /* if we are reconnecting then should we check to see if
2183 * any requested capabilities changed locally e.g. via
2184 * remount but we can not do much about it here
2185 * if they have (even if we could detect it by the following)
2186 * Perhaps we could add a backpointer to array of sb from tcon
2187 * or if we change to make all sb to same share the same
2188 * sb as NFS - then we only have one backpointer to sb.
2189 * What if we wanted to mount the server share twice once with
2190 * and once without posixacls or posix paths? */
2191 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2192
2193 if (vol_info && vol_info->no_linux_ext) {
2194 tcon->fsUnixInfo.Capability = 0;
2195 tcon->unix_ext = 0; /* Unix Extensions disabled */
2196 cFYI(1, "Linux protocol extensions disabled");
2197 return;
2198 } else if (vol_info)
2199 tcon->unix_ext = 1; /* Unix Extensions supported */
2200
2201 if (tcon->unix_ext == 0) {
2202 cFYI(1, "Unix extensions disabled so not set on reconnect");
2203 return;
2204 }
2205
2206 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2207 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2208
2209 /* check for reconnect case in which we do not
2210 want to change the mount behavior if we can avoid it */
2211 if (vol_info == NULL) {
2212 /* turn off POSIX ACL and PATHNAMES if not set
2213 originally at mount time */
2214 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2215 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2216 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2217 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2218 cERROR(1, "POSIXPATH support change");
2219 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2220 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2221 cERROR(1, "possible reconnect error");
2222 cERROR(1, "server disabled POSIX path support");
2223 }
2224 }
2225
2226 cap &= CIFS_UNIX_CAP_MASK;
2227 if (vol_info && vol_info->no_psx_acl)
2228 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2229 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2230 cFYI(1, "negotiated posix acl support");
2231 if (sb)
2232 sb->s_flags |= MS_POSIXACL;
2233 }
2234
2235 if (vol_info && vol_info->posix_paths == 0)
2236 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2237 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2238 cFYI(1, "negotiate posix pathnames");
2239 if (sb)
2240 CIFS_SB(sb)->mnt_cifs_flags |=
2241 CIFS_MOUNT_POSIX_PATHS;
2242 }
2243
2244 /* We might be setting the path sep back to a different
2245 form if we are reconnecting and the server switched its
2246 posix path capability for this share */
2247 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2248 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2249
2250 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2251 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2252 CIFS_SB(sb)->rsize = 127 * 1024;
2253 cFYI(DBG2, "larger reads not supported by srv");
2254 }
2255 }
2256
2257
2258 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2259 #ifdef CONFIG_CIFS_DEBUG2
2260 if (cap & CIFS_UNIX_FCNTL_CAP)
2261 cFYI(1, "FCNTL cap");
2262 if (cap & CIFS_UNIX_EXTATTR_CAP)
2263 cFYI(1, "EXTATTR cap");
2264 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2265 cFYI(1, "POSIX path cap");
2266 if (cap & CIFS_UNIX_XATTR_CAP)
2267 cFYI(1, "XATTR cap");
2268 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2269 cFYI(1, "POSIX ACL cap");
2270 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2271 cFYI(1, "very large read cap");
2272 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2273 cFYI(1, "very large write cap");
2274 #endif /* CIFS_DEBUG2 */
2275 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2276 if (vol_info == NULL) {
2277 cFYI(1, "resetting capabilities failed");
2278 } else
2279 cERROR(1, "Negotiating Unix capabilities "
2280 "with the server failed. Consider "
2281 "mounting with the Unix Extensions\n"
2282 "disabled, if problems are found, "
2283 "by specifying the nounix mount "
2284 "option.");
2285
2286 }
2287 }
2288 }
2289
2290 static void
2291 convert_delimiter(char *path, char delim)
2292 {
2293 int i;
2294 char old_delim;
2295
2296 if (path == NULL)
2297 return;
2298
2299 if (delim == '/')
2300 old_delim = '\\';
2301 else
2302 old_delim = '/';
2303
2304 for (i = 0; path[i] != '\0'; i++) {
2305 if (path[i] == old_delim)
2306 path[i] = delim;
2307 }
2308 }
2309
2310 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2311 struct cifs_sb_info *cifs_sb)
2312 {
2313 if (pvolume_info->rsize > CIFSMaxBufSize) {
2314 cERROR(1, "rsize %d too large, using MaxBufSize",
2315 pvolume_info->rsize);
2316 cifs_sb->rsize = CIFSMaxBufSize;
2317 } else if ((pvolume_info->rsize) &&
2318 (pvolume_info->rsize <= CIFSMaxBufSize))
2319 cifs_sb->rsize = pvolume_info->rsize;
2320 else /* default */
2321 cifs_sb->rsize = CIFSMaxBufSize;
2322
2323 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2324 cERROR(1, "wsize %d too large, using 4096 instead",
2325 pvolume_info->wsize);
2326 cifs_sb->wsize = 4096;
2327 } else if (pvolume_info->wsize)
2328 cifs_sb->wsize = pvolume_info->wsize;
2329 else
2330 cifs_sb->wsize = min_t(const int,
2331 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2332 127*1024);
2333 /* old default of CIFSMaxBufSize was too small now
2334 that SMB Write2 can send multiple pages in kvec.
2335 RFC1001 does not describe what happens when frame
2336 bigger than 128K is sent so use that as max in
2337 conjunction with 52K kvec constraint on arch with 4K
2338 page size */
2339
2340 if (cifs_sb->rsize < 2048) {
2341 cifs_sb->rsize = 2048;
2342 /* Windows ME may prefer this */
2343 cFYI(1, "readsize set to minimum: 2048");
2344 }
2345 /* calculate prepath */
2346 cifs_sb->prepath = pvolume_info->prepath;
2347 if (cifs_sb->prepath) {
2348 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2349 /* we can not convert the / to \ in the path
2350 separators in the prefixpath yet because we do not
2351 know (until reset_cifs_unix_caps is called later)
2352 whether POSIX PATH CAP is available. We normalize
2353 the / to \ after reset_cifs_unix_caps is called */
2354 pvolume_info->prepath = NULL;
2355 } else
2356 cifs_sb->prepathlen = 0;
2357 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2358 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2359 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2360 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2361 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2362 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2363
2364 if (pvolume_info->noperm)
2365 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2366 if (pvolume_info->setuids)
2367 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2368 if (pvolume_info->server_ino)
2369 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2370 if (pvolume_info->remap)
2371 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2372 if (pvolume_info->no_xattr)
2373 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2374 if (pvolume_info->sfu_emul)
2375 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2376 if (pvolume_info->nobrl)
2377 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2378 if (pvolume_info->nostrictsync)
2379 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2380 if (pvolume_info->mand_lock)
2381 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2382 if (pvolume_info->cifs_acl)
2383 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2384 if (pvolume_info->override_uid)
2385 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2386 if (pvolume_info->override_gid)
2387 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2388 if (pvolume_info->dynperm)
2389 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2390 if (pvolume_info->direct_io) {
2391 cFYI(1, "mounting share using direct i/o");
2392 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2393 }
2394
2395 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2396 cERROR(1, "mount option dynperm ignored if cifsacl "
2397 "mount option supported");
2398 }
2399
2400 static int
2401 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2402 struct cifs_sb_info *cifs_sb, const char *full_path)
2403 {
2404 int rc;
2405 FILE_ALL_INFO *pfile_info;
2406
2407 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2408 if (pfile_info == NULL)
2409 return -ENOMEM;
2410
2411 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2412 0 /* not legacy */, cifs_sb->local_nls,
2413 cifs_sb->mnt_cifs_flags &
2414 CIFS_MOUNT_MAP_SPECIAL_CHR);
2415 kfree(pfile_info);
2416 return rc;
2417 }
2418
2419 static void
2420 cleanup_volume_info(struct smb_vol **pvolume_info)
2421 {
2422 struct smb_vol *volume_info;
2423
2424 if (!pvolume_info && !*pvolume_info)
2425 return;
2426
2427 volume_info = *pvolume_info;
2428 kzfree(volume_info->password);
2429 kfree(volume_info->UNC);
2430 kfree(volume_info->prepath);
2431 kfree(volume_info);
2432 *pvolume_info = NULL;
2433 return;
2434 }
2435
2436 #ifdef CONFIG_CIFS_DFS_UPCALL
2437 /* build_path_to_root returns full path to root when
2438 * we do not have an exiting connection (tcon) */
2439 static char *
2440 build_unc_path_to_root(const struct smb_vol *volume_info,
2441 const struct cifs_sb_info *cifs_sb)
2442 {
2443 char *full_path;
2444
2445 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2446 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2447 if (full_path == NULL)
2448 return ERR_PTR(-ENOMEM);
2449
2450 strncpy(full_path, volume_info->UNC, unc_len);
2451 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2452 int i;
2453 for (i = 0; i < unc_len; i++) {
2454 if (full_path[i] == '\\')
2455 full_path[i] = '/';
2456 }
2457 }
2458
2459 if (cifs_sb->prepathlen)
2460 strncpy(full_path + unc_len, cifs_sb->prepath,
2461 cifs_sb->prepathlen);
2462
2463 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2464 return full_path;
2465 }
2466 #endif
2467
2468 int
2469 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2470 char *mount_data_global, const char *devname)
2471 {
2472 int rc;
2473 int xid;
2474 struct smb_vol *volume_info;
2475 struct cifsSesInfo *pSesInfo;
2476 struct cifsTconInfo *tcon;
2477 struct TCP_Server_Info *srvTcp;
2478 char *full_path;
2479 char *mount_data = mount_data_global;
2480 #ifdef CONFIG_CIFS_DFS_UPCALL
2481 struct dfs_info3_param *referrals = NULL;
2482 unsigned int num_referrals = 0;
2483 int referral_walks_count = 0;
2484 try_mount_again:
2485 #endif
2486 rc = 0;
2487 tcon = NULL;
2488 pSesInfo = NULL;
2489 srvTcp = NULL;
2490 full_path = NULL;
2491
2492 xid = GetXid();
2493
2494 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2495 if (!volume_info) {
2496 rc = -ENOMEM;
2497 goto out;
2498 }
2499
2500 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2501 rc = -EINVAL;
2502 goto out;
2503 }
2504
2505 if (volume_info->nullauth) {
2506 cFYI(1, "null user");
2507 volume_info->username = "";
2508 } else if (volume_info->username) {
2509 /* BB fixme parse for domain name here */
2510 cFYI(1, "Username: %s", volume_info->username);
2511 } else {
2512 cifserror("No username specified");
2513 /* In userspace mount helper we can get user name from alternate
2514 locations such as env variables and files on disk */
2515 rc = -EINVAL;
2516 goto out;
2517 }
2518
2519 /* this is needed for ASCII cp to Unicode converts */
2520 if (volume_info->iocharset == NULL) {
2521 /* load_nls_default cannot return null */
2522 volume_info->local_nls = load_nls_default();
2523 } else {
2524 volume_info->local_nls = load_nls(volume_info->iocharset);
2525 if (volume_info->local_nls == NULL) {
2526 cERROR(1, "CIFS mount error: iocharset %s not found",
2527 volume_info->iocharset);
2528 rc = -ELIBACC;
2529 goto out;
2530 }
2531 }
2532 cifs_sb->local_nls = volume_info->local_nls;
2533
2534 /* get a reference to a tcp session */
2535 srvTcp = cifs_get_tcp_session(volume_info);
2536 if (IS_ERR(srvTcp)) {
2537 rc = PTR_ERR(srvTcp);
2538 goto out;
2539 }
2540
2541 /* get a reference to a SMB session */
2542 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2543 if (IS_ERR(pSesInfo)) {
2544 rc = PTR_ERR(pSesInfo);
2545 pSesInfo = NULL;
2546 goto mount_fail_check;
2547 }
2548
2549 setup_cifs_sb(volume_info, cifs_sb);
2550 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2551 sb->s_maxbytes = MAX_LFS_FILESIZE;
2552 else
2553 sb->s_maxbytes = MAX_NON_LFS;
2554
2555 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2556 sb->s_time_gran = 100;
2557
2558 /* search for existing tcon to this server share */
2559 tcon = cifs_get_tcon(pSesInfo, volume_info);
2560 if (IS_ERR(tcon)) {
2561 rc = PTR_ERR(tcon);
2562 tcon = NULL;
2563 goto remote_path_check;
2564 }
2565
2566 cifs_sb->tcon = tcon;
2567
2568 /* do not care if following two calls succeed - informational */
2569 if (!tcon->ipc) {
2570 CIFSSMBQFSDeviceInfo(xid, tcon);
2571 CIFSSMBQFSAttributeInfo(xid, tcon);
2572 }
2573
2574 /* tell server which Unix caps we support */
2575 if (tcon->ses->capabilities & CAP_UNIX)
2576 /* reset of caps checks mount to see if unix extensions
2577 disabled for just this mount */
2578 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2579 else
2580 tcon->unix_ext = 0; /* server does not support them */
2581
2582 /* convert forward to back slashes in prepath here if needed */
2583 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2584 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2585
2586 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2587 cifs_sb->rsize = 1024 * 127;
2588 cFYI(DBG2, "no very large read support, rsize now 127K");
2589 }
2590 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2591 cifs_sb->wsize = min(cifs_sb->wsize,
2592 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2593 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2594 cifs_sb->rsize = min(cifs_sb->rsize,
2595 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2596
2597 remote_path_check:
2598 /* check if a whole path (including prepath) is not remote */
2599 if (!rc && cifs_sb->prepathlen && tcon) {
2600 /* build_path_to_root works only when we have a valid tcon */
2601 full_path = cifs_build_path_to_root(cifs_sb);
2602 if (full_path == NULL) {
2603 rc = -ENOMEM;
2604 goto mount_fail_check;
2605 }
2606 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2607 if (rc != -EREMOTE) {
2608 kfree(full_path);
2609 goto mount_fail_check;
2610 }
2611 kfree(full_path);
2612 }
2613
2614 /* get referral if needed */
2615 if (rc == -EREMOTE) {
2616 #ifdef CONFIG_CIFS_DFS_UPCALL
2617 if (referral_walks_count > MAX_NESTED_LINKS) {
2618 /*
2619 * BB: when we implement proper loop detection,
2620 * we will remove this check. But now we need it
2621 * to prevent an indefinite loop if 'DFS tree' is
2622 * misconfigured (i.e. has loops).
2623 */
2624 rc = -ELOOP;
2625 goto mount_fail_check;
2626 }
2627 /* convert forward to back slashes in prepath here if needed */
2628 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2629 convert_delimiter(cifs_sb->prepath,
2630 CIFS_DIR_SEP(cifs_sb));
2631 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2632 if (IS_ERR(full_path)) {
2633 rc = PTR_ERR(full_path);
2634 goto mount_fail_check;
2635 }
2636
2637 cFYI(1, "Getting referral for: %s", full_path);
2638 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2639 cifs_sb->local_nls, &num_referrals, &referrals,
2640 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2641 if (!rc && num_referrals > 0) {
2642 char *fake_devname = NULL;
2643
2644 if (mount_data != mount_data_global)
2645 kfree(mount_data);
2646
2647 mount_data = cifs_compose_mount_options(
2648 cifs_sb->mountdata, full_path + 1,
2649 referrals, &fake_devname);
2650
2651 free_dfs_info_array(referrals, num_referrals);
2652 kfree(fake_devname);
2653 kfree(full_path);
2654
2655 if (IS_ERR(mount_data)) {
2656 rc = PTR_ERR(mount_data);
2657 mount_data = NULL;
2658 goto mount_fail_check;
2659 }
2660
2661 if (tcon)
2662 cifs_put_tcon(tcon);
2663 else if (pSesInfo)
2664 cifs_put_smb_ses(pSesInfo);
2665
2666 cleanup_volume_info(&volume_info);
2667 referral_walks_count++;
2668 FreeXid(xid);
2669 goto try_mount_again;
2670 }
2671 #else /* No DFS support, return error on mount */
2672 rc = -EOPNOTSUPP;
2673 #endif
2674 }
2675
2676 mount_fail_check:
2677 /* on error free sesinfo and tcon struct if needed */
2678 if (rc) {
2679 if (mount_data != mount_data_global)
2680 kfree(mount_data);
2681 /* If find_unc succeeded then rc == 0 so we can not end */
2682 /* up accidently freeing someone elses tcon struct */
2683 if (tcon)
2684 cifs_put_tcon(tcon);
2685 else if (pSesInfo)
2686 cifs_put_smb_ses(pSesInfo);
2687 else
2688 cifs_put_tcp_session(srvTcp);
2689 goto out;
2690 }
2691
2692 /* volume_info->password is freed above when existing session found
2693 (in which case it is not needed anymore) but when new sesion is created
2694 the password ptr is put in the new session structure (in which case the
2695 password will be freed at unmount time) */
2696 out:
2697 /* zero out password before freeing */
2698 cleanup_volume_info(&volume_info);
2699 FreeXid(xid);
2700 return rc;
2701 }
2702
2703 int
2704 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2705 const char *tree, struct cifsTconInfo *tcon,
2706 const struct nls_table *nls_codepage)
2707 {
2708 struct smb_hdr *smb_buffer;
2709 struct smb_hdr *smb_buffer_response;
2710 TCONX_REQ *pSMB;
2711 TCONX_RSP *pSMBr;
2712 unsigned char *bcc_ptr;
2713 int rc = 0;
2714 int length, bytes_left;
2715 __u16 count;
2716
2717 if (ses == NULL)
2718 return -EIO;
2719
2720 smb_buffer = cifs_buf_get();
2721 if (smb_buffer == NULL)
2722 return -ENOMEM;
2723
2724 smb_buffer_response = smb_buffer;
2725
2726 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2727 NULL /*no tid */ , 4 /*wct */ );
2728
2729 smb_buffer->Mid = GetNextMid(ses->server);
2730 smb_buffer->Uid = ses->Suid;
2731 pSMB = (TCONX_REQ *) smb_buffer;
2732 pSMBr = (TCONX_RSP *) smb_buffer_response;
2733
2734 pSMB->AndXCommand = 0xFF;
2735 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2736 bcc_ptr = &pSMB->Password[0];
2737 if ((ses->server->secMode) & SECMODE_USER) {
2738 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2739 *bcc_ptr = 0; /* password is null byte */
2740 bcc_ptr++; /* skip password */
2741 /* already aligned so no need to do it below */
2742 } else {
2743 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2744 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2745 specified as required (when that support is added to
2746 the vfs in the future) as only NTLM or the much
2747 weaker LANMAN (which we do not send by default) is accepted
2748 by Samba (not sure whether other servers allow
2749 NTLMv2 password here) */
2750 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2751 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2752 (ses->server->secType == LANMAN))
2753 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2754 ses->server->secMode &
2755 SECMODE_PW_ENCRYPT ? true : false,
2756 bcc_ptr);
2757 else
2758 #endif /* CIFS_WEAK_PW_HASH */
2759 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2760 bcc_ptr);
2761
2762 bcc_ptr += CIFS_SESS_KEY_SIZE;
2763 if (ses->capabilities & CAP_UNICODE) {
2764 /* must align unicode strings */
2765 *bcc_ptr = 0; /* null byte password */
2766 bcc_ptr++;
2767 }
2768 }
2769
2770 if (ses->server->secMode &
2771 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2772 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2773
2774 if (ses->capabilities & CAP_STATUS32) {
2775 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2776 }
2777 if (ses->capabilities & CAP_DFS) {
2778 smb_buffer->Flags2 |= SMBFLG2_DFS;
2779 }
2780 if (ses->capabilities & CAP_UNICODE) {
2781 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2782 length =
2783 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2784 6 /* max utf8 char length in bytes */ *
2785 (/* server len*/ + 256 /* share len */), nls_codepage);
2786 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2787 bcc_ptr += 2; /* skip trailing null */
2788 } else { /* ASCII */
2789 strcpy(bcc_ptr, tree);
2790 bcc_ptr += strlen(tree) + 1;
2791 }
2792 strcpy(bcc_ptr, "?????");
2793 bcc_ptr += strlen("?????");
2794 bcc_ptr += 1;
2795 count = bcc_ptr - &pSMB->Password[0];
2796 pSMB->hdr.smb_buf_length += count;
2797 pSMB->ByteCount = cpu_to_le16(count);
2798
2799 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2800 CIFS_STD_OP);
2801
2802 /* above now done in SendReceive */
2803 if ((rc == 0) && (tcon != NULL)) {
2804 bool is_unicode;
2805
2806 tcon->tidStatus = CifsGood;
2807 tcon->need_reconnect = false;
2808 tcon->tid = smb_buffer_response->Tid;
2809 bcc_ptr = pByteArea(smb_buffer_response);
2810 bytes_left = BCC(smb_buffer_response);
2811 length = strnlen(bcc_ptr, bytes_left - 2);
2812 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2813 is_unicode = true;
2814 else
2815 is_unicode = false;
2816
2817
2818 /* skip service field (NB: this field is always ASCII) */
2819 if (length == 3) {
2820 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2821 (bcc_ptr[2] == 'C')) {
2822 cFYI(1, "IPC connection");
2823 tcon->ipc = 1;
2824 }
2825 } else if (length == 2) {
2826 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2827 /* the most common case */
2828 cFYI(1, "disk share connection");
2829 }
2830 }
2831 bcc_ptr += length + 1;
2832 bytes_left -= (length + 1);
2833 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2834
2835 /* mostly informational -- no need to fail on error here */
2836 kfree(tcon->nativeFileSystem);
2837 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2838 bytes_left, is_unicode,
2839 nls_codepage);
2840
2841 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2842
2843 if ((smb_buffer_response->WordCount == 3) ||
2844 (smb_buffer_response->WordCount == 7))
2845 /* field is in same location */
2846 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2847 else
2848 tcon->Flags = 0;
2849 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2850 } else if ((rc == 0) && tcon == NULL) {
2851 /* all we need to save for IPC$ connection */
2852 ses->ipc_tid = smb_buffer_response->Tid;
2853 }
2854
2855 cifs_buf_release(smb_buffer);
2856 return rc;
2857 }
2858
2859 int
2860 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2861 {
2862 int rc = 0;
2863 char *tmp;
2864
2865 if (cifs_sb->tcon)
2866 cifs_put_tcon(cifs_sb->tcon);
2867
2868 cifs_sb->tcon = NULL;
2869 tmp = cifs_sb->prepath;
2870 cifs_sb->prepathlen = 0;
2871 cifs_sb->prepath = NULL;
2872 kfree(tmp);
2873
2874 return rc;
2875 }
2876
2877 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2878 struct nls_table *nls_info)
2879 {
2880 int rc = 0;
2881 int first_time = 0;
2882 struct TCP_Server_Info *server = pSesInfo->server;
2883
2884 /* what if server changes its buffer size after dropping the session? */
2885 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2886 rc = CIFSSMBNegotiate(xid, pSesInfo);
2887 if (rc == -EAGAIN) {
2888 /* retry only once on 1st time connection */
2889 rc = CIFSSMBNegotiate(xid, pSesInfo);
2890 if (rc == -EAGAIN)
2891 rc = -EHOSTDOWN;
2892 }
2893 if (rc == 0) {
2894 spin_lock(&GlobalMid_Lock);
2895 if (server->tcpStatus != CifsExiting)
2896 server->tcpStatus = CifsGood;
2897 else
2898 rc = -EHOSTDOWN;
2899 spin_unlock(&GlobalMid_Lock);
2900
2901 }
2902 first_time = 1;
2903 }
2904
2905 if (rc)
2906 goto ss_err_exit;
2907
2908 pSesInfo->flags = 0;
2909 pSesInfo->capabilities = server->capabilities;
2910 if (linuxExtEnabled == 0)
2911 pSesInfo->capabilities &= (~CAP_UNIX);
2912
2913 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2914 server->secMode, server->capabilities, server->timeAdj);
2915
2916 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2917 if (rc) {
2918 cERROR(1, "Send error in SessSetup = %d", rc);
2919 } else {
2920 cFYI(1, "CIFS Session Established successfully");
2921 spin_lock(&GlobalMid_Lock);
2922 pSesInfo->status = CifsGood;
2923 pSesInfo->need_reconnect = false;
2924 spin_unlock(&GlobalMid_Lock);
2925 }
2926
2927 ss_err_exit:
2928 return rc;
2929 }
2930
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree