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Linux 2.6.35-rc2
[linux/fpc-iii.git] / fs / cifs / connect.c
blob2208f06e4c45ec17d1908b5435ee556be54d6dbe
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 rc = cifs_negotiate_protocol(xid, ses);
1655 if (rc) {
1656 mutex_unlock(&ses->session_mutex);
1657 /* problem -- put our ses reference */
1658 cifs_put_smb_ses(ses);
1659 FreeXid(xid);
1660 return ERR_PTR(rc);
1661 }
1662 if (ses->need_reconnect) {
1663 cFYI(1, "Session needs reconnect");
1664 rc = cifs_setup_session(xid, ses,
1665 volume_info->local_nls);
1666 if (rc) {
1667 mutex_unlock(&ses->session_mutex);
1668 /* problem -- put our reference */
1669 cifs_put_smb_ses(ses);
1670 FreeXid(xid);
1671 return ERR_PTR(rc);
1672 }
1673 }
1674 mutex_unlock(&ses->session_mutex);
1675 FreeXid(xid);
1676 return ses;
1677 }
1678
1679 cFYI(1, "Existing smb sess not found");
1680 ses = sesInfoAlloc();
1681 if (ses == NULL)
1682 goto get_ses_fail;
1683
1684 /* new SMB session uses our server ref */
1685 ses->server = server;
1686 if (server->addr.sockAddr6.sin6_family == AF_INET6)
1687 sprintf(ses->serverName, "%pI6",
1688 &server->addr.sockAddr6.sin6_addr);
1689 else
1690 sprintf(ses->serverName, "%pI4",
1691 &server->addr.sockAddr.sin_addr.s_addr);
1692
1693 if (volume_info->username)
1694 strncpy(ses->userName, volume_info->username,
1695 MAX_USERNAME_SIZE);
1696
1697 /* volume_info->password freed at unmount */
1698 if (volume_info->password) {
1699 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1700 if (!ses->password)
1701 goto get_ses_fail;
1702 }
1703 if (volume_info->domainname) {
1704 int len = strlen(volume_info->domainname);
1705 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1706 if (ses->domainName)
1707 strcpy(ses->domainName, volume_info->domainname);
1708 }
1709 ses->linux_uid = volume_info->linux_uid;
1710 ses->overrideSecFlg = volume_info->secFlg;
1711
1712 mutex_lock(&ses->session_mutex);
1713 rc = cifs_negotiate_protocol(xid, ses);
1714 if (!rc)
1715 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1716 mutex_unlock(&ses->session_mutex);
1717 if (rc)
1718 goto get_ses_fail;
1719
1720 /* success, put it on the list */
1721 write_lock(&cifs_tcp_ses_lock);
1722 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1723 write_unlock(&cifs_tcp_ses_lock);
1724
1725 FreeXid(xid);
1726 return ses;
1727
1728 get_ses_fail:
1729 sesInfoFree(ses);
1730 FreeXid(xid);
1731 return ERR_PTR(rc);
1732 }
1733
1734 static struct cifsTconInfo *
1735 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1736 {
1737 struct list_head *tmp;
1738 struct cifsTconInfo *tcon;
1739
1740 write_lock(&cifs_tcp_ses_lock);
1741 list_for_each(tmp, &ses->tcon_list) {
1742 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1743 if (tcon->tidStatus == CifsExiting)
1744 continue;
1745 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1746 continue;
1747
1748 ++tcon->tc_count;
1749 write_unlock(&cifs_tcp_ses_lock);
1750 return tcon;
1751 }
1752 write_unlock(&cifs_tcp_ses_lock);
1753 return NULL;
1754 }
1755
1756 static void
1757 cifs_put_tcon(struct cifsTconInfo *tcon)
1758 {
1759 int xid;
1760 struct cifsSesInfo *ses = tcon->ses;
1761
1762 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1763 write_lock(&cifs_tcp_ses_lock);
1764 if (--tcon->tc_count > 0) {
1765 write_unlock(&cifs_tcp_ses_lock);
1766 return;
1767 }
1768
1769 list_del_init(&tcon->tcon_list);
1770 write_unlock(&cifs_tcp_ses_lock);
1771
1772 xid = GetXid();
1773 CIFSSMBTDis(xid, tcon);
1774 _FreeXid(xid);
1775
1776 tconInfoFree(tcon);
1777 cifs_put_smb_ses(ses);
1778 }
1779
1780 static struct cifsTconInfo *
1781 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1782 {
1783 int rc, xid;
1784 struct cifsTconInfo *tcon;
1785
1786 tcon = cifs_find_tcon(ses, volume_info->UNC);
1787 if (tcon) {
1788 cFYI(1, "Found match on UNC path");
1789 /* existing tcon already has a reference */
1790 cifs_put_smb_ses(ses);
1791 if (tcon->seal != volume_info->seal)
1792 cERROR(1, "transport encryption setting "
1793 "conflicts with existing tid");
1794 return tcon;
1795 }
1796
1797 tcon = tconInfoAlloc();
1798 if (tcon == NULL) {
1799 rc = -ENOMEM;
1800 goto out_fail;
1801 }
1802
1803 tcon->ses = ses;
1804 if (volume_info->password) {
1805 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1806 if (!tcon->password) {
1807 rc = -ENOMEM;
1808 goto out_fail;
1809 }
1810 }
1811
1812 if (strchr(volume_info->UNC + 3, '\\') == NULL
1813 && strchr(volume_info->UNC + 3, '/') == NULL) {
1814 cERROR(1, "Missing share name");
1815 rc = -ENODEV;
1816 goto out_fail;
1817 }
1818
1819 /* BB Do we need to wrap session_mutex around
1820 * this TCon call and Unix SetFS as
1821 * we do on SessSetup and reconnect? */
1822 xid = GetXid();
1823 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1824 FreeXid(xid);
1825 cFYI(1, "CIFS Tcon rc = %d", rc);
1826 if (rc)
1827 goto out_fail;
1828
1829 if (volume_info->nodfs) {
1830 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1831 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1832 }
1833 tcon->seal = volume_info->seal;
1834 /* we can have only one retry value for a connection
1835 to a share so for resources mounted more than once
1836 to the same server share the last value passed in
1837 for the retry flag is used */
1838 tcon->retry = volume_info->retry;
1839 tcon->nocase = volume_info->nocase;
1840 tcon->local_lease = volume_info->local_lease;
1841
1842 write_lock(&cifs_tcp_ses_lock);
1843 list_add(&tcon->tcon_list, &ses->tcon_list);
1844 write_unlock(&cifs_tcp_ses_lock);
1845
1846 return tcon;
1847
1848 out_fail:
1849 tconInfoFree(tcon);
1850 return ERR_PTR(rc);
1851 }
1852
1853
1854 int
1855 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1856 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1857 struct dfs_info3_param **preferrals, int remap)
1858 {
1859 char *temp_unc;
1860 int rc = 0;
1861
1862 *pnum_referrals = 0;
1863 *preferrals = NULL;
1864
1865 if (pSesInfo->ipc_tid == 0) {
1866 temp_unc = kmalloc(2 /* for slashes */ +
1867 strnlen(pSesInfo->serverName,
1868 SERVER_NAME_LEN_WITH_NULL * 2)
1869 + 1 + 4 /* slash IPC$ */ + 2,
1870 GFP_KERNEL);
1871 if (temp_unc == NULL)
1872 return -ENOMEM;
1873 temp_unc[0] = '\\';
1874 temp_unc[1] = '\\';
1875 strcpy(temp_unc + 2, pSesInfo->serverName);
1876 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1877 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1878 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1879 kfree(temp_unc);
1880 }
1881 if (rc == 0)
1882 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1883 pnum_referrals, nls_codepage, remap);
1884 /* BB map targetUNCs to dfs_info3 structures, here or
1885 in CIFSGetDFSRefer BB */
1886
1887 return rc;
1888 }
1889
1890 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1891 static struct lock_class_key cifs_key[2];
1892 static struct lock_class_key cifs_slock_key[2];
1893
1894 static inline void
1895 cifs_reclassify_socket4(struct socket *sock)
1896 {
1897 struct sock *sk = sock->sk;
1898 BUG_ON(sock_owned_by_user(sk));
1899 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1900 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1901 }
1902
1903 static inline void
1904 cifs_reclassify_socket6(struct socket *sock)
1905 {
1906 struct sock *sk = sock->sk;
1907 BUG_ON(sock_owned_by_user(sk));
1908 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1909 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1910 }
1911 #else
1912 static inline void
1913 cifs_reclassify_socket4(struct socket *sock)
1914 {
1915 }
1916
1917 static inline void
1918 cifs_reclassify_socket6(struct socket *sock)
1919 {
1920 }
1921 #endif
1922
1923 /* See RFC1001 section 14 on representation of Netbios names */
1924 static void rfc1002mangle(char *target, char *source, unsigned int length)
1925 {
1926 unsigned int i, j;
1927
1928 for (i = 0, j = 0; i < (length); i++) {
1929 /* mask a nibble at a time and encode */
1930 target[j] = 'A' + (0x0F & (source[i] >> 4));
1931 target[j+1] = 'A' + (0x0F & source[i]);
1932 j += 2;
1933 }
1934
1935 }
1936
1937
1938 static int
1939 ipv4_connect(struct TCP_Server_Info *server)
1940 {
1941 int rc = 0;
1942 int val;
1943 bool connected = false;
1944 __be16 orig_port = 0;
1945 struct socket *socket = server->ssocket;
1946
1947 if (socket == NULL) {
1948 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1949 IPPROTO_TCP, &socket);
1950 if (rc < 0) {
1951 cERROR(1, "Error %d creating socket", rc);
1952 return rc;
1953 }
1954
1955 /* BB other socket options to set KEEPALIVE, NODELAY? */
1956 cFYI(1, "Socket created");
1957 server->ssocket = socket;
1958 socket->sk->sk_allocation = GFP_NOFS;
1959 cifs_reclassify_socket4(socket);
1960 }
1961
1962 /* user overrode default port */
1963 if (server->addr.sockAddr.sin_port) {
1964 rc = socket->ops->connect(socket, (struct sockaddr *)
1965 &server->addr.sockAddr,
1966 sizeof(struct sockaddr_in), 0);
1967 if (rc >= 0)
1968 connected = true;
1969 }
1970
1971 if (!connected) {
1972 /* save original port so we can retry user specified port
1973 later if fall back ports fail this time */
1974 orig_port = server->addr.sockAddr.sin_port;
1975
1976 /* do not retry on the same port we just failed on */
1977 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1978 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1979 rc = socket->ops->connect(socket,
1980 (struct sockaddr *)
1981 &server->addr.sockAddr,
1982 sizeof(struct sockaddr_in), 0);
1983 if (rc >= 0)
1984 connected = true;
1985 }
1986 }
1987 if (!connected) {
1988 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1989 rc = socket->ops->connect(socket, (struct sockaddr *)
1990 &server->addr.sockAddr,
1991 sizeof(struct sockaddr_in), 0);
1992 if (rc >= 0)
1993 connected = true;
1994 }
1995
1996 /* give up here - unless we want to retry on different
1997 protocol families some day */
1998 if (!connected) {
1999 if (orig_port)
2000 server->addr.sockAddr.sin_port = orig_port;
2001 cFYI(1, "Error %d connecting to server via ipv4", rc);
2002 sock_release(socket);
2003 server->ssocket = NULL;
2004 return rc;
2005 }
2006
2007
2008 /*
2009 * Eventually check for other socket options to change from
2010 * the default. sock_setsockopt not used because it expects
2011 * user space buffer
2012 */
2013 socket->sk->sk_rcvtimeo = 7 * HZ;
2014 socket->sk->sk_sndtimeo = 5 * HZ;
2015
2016 /* make the bufsizes depend on wsize/rsize and max requests */
2017 if (server->noautotune) {
2018 if (socket->sk->sk_sndbuf < (200 * 1024))
2019 socket->sk->sk_sndbuf = 200 * 1024;
2020 if (socket->sk->sk_rcvbuf < (140 * 1024))
2021 socket->sk->sk_rcvbuf = 140 * 1024;
2022 }
2023
2024 if (server->tcp_nodelay) {
2025 val = 1;
2026 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2027 (char *)&val, sizeof(val));
2028 if (rc)
2029 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2030 }
2031
2032 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2033 socket->sk->sk_sndbuf,
2034 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2035
2036 /* send RFC1001 sessinit */
2037 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2038 /* some servers require RFC1001 sessinit before sending
2039 negprot - BB check reconnection in case where second
2040 sessinit is sent but no second negprot */
2041 struct rfc1002_session_packet *ses_init_buf;
2042 struct smb_hdr *smb_buf;
2043 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2044 GFP_KERNEL);
2045 if (ses_init_buf) {
2046 ses_init_buf->trailer.session_req.called_len = 32;
2047 if (server->server_RFC1001_name &&
2048 server->server_RFC1001_name[0] != 0)
2049 rfc1002mangle(ses_init_buf->trailer.
2050 session_req.called_name,
2051 server->server_RFC1001_name,
2052 RFC1001_NAME_LEN_WITH_NULL);
2053 else
2054 rfc1002mangle(ses_init_buf->trailer.
2055 session_req.called_name,
2056 DEFAULT_CIFS_CALLED_NAME,
2057 RFC1001_NAME_LEN_WITH_NULL);
2058
2059 ses_init_buf->trailer.session_req.calling_len = 32;
2060
2061 /* calling name ends in null (byte 16) from old smb
2062 convention. */
2063 if (server->workstation_RFC1001_name &&
2064 server->workstation_RFC1001_name[0] != 0)
2065 rfc1002mangle(ses_init_buf->trailer.
2066 session_req.calling_name,
2067 server->workstation_RFC1001_name,
2068 RFC1001_NAME_LEN_WITH_NULL);
2069 else
2070 rfc1002mangle(ses_init_buf->trailer.
2071 session_req.calling_name,
2072 "LINUX_CIFS_CLNT",
2073 RFC1001_NAME_LEN_WITH_NULL);
2074
2075 ses_init_buf->trailer.session_req.scope1 = 0;
2076 ses_init_buf->trailer.session_req.scope2 = 0;
2077 smb_buf = (struct smb_hdr *)ses_init_buf;
2078 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2079 smb_buf->smb_buf_length = 0x81000044;
2080 rc = smb_send(server, smb_buf, 0x44);
2081 kfree(ses_init_buf);
2082 msleep(1); /* RFC1001 layer in at least one server
2083 requires very short break before negprot
2084 presumably because not expecting negprot
2085 to follow so fast. This is a simple
2086 solution that works without
2087 complicating the code and causes no
2088 significant slowing down on mount
2089 for everyone else */
2090 }
2091 /* else the negprot may still work without this
2092 even though malloc failed */
2093
2094 }
2095
2096 return rc;
2097 }
2098
2099 static int
2100 ipv6_connect(struct TCP_Server_Info *server)
2101 {
2102 int rc = 0;
2103 int val;
2104 bool connected = false;
2105 __be16 orig_port = 0;
2106 struct socket *socket = server->ssocket;
2107
2108 if (socket == NULL) {
2109 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2110 IPPROTO_TCP, &socket);
2111 if (rc < 0) {
2112 cERROR(1, "Error %d creating ipv6 socket", rc);
2113 socket = NULL;
2114 return rc;
2115 }
2116
2117 /* BB other socket options to set KEEPALIVE, NODELAY? */
2118 cFYI(1, "ipv6 Socket created");
2119 server->ssocket = socket;
2120 socket->sk->sk_allocation = GFP_NOFS;
2121 cifs_reclassify_socket6(socket);
2122 }
2123
2124 /* user overrode default port */
2125 if (server->addr.sockAddr6.sin6_port) {
2126 rc = socket->ops->connect(socket,
2127 (struct sockaddr *) &server->addr.sockAddr6,
2128 sizeof(struct sockaddr_in6), 0);
2129 if (rc >= 0)
2130 connected = true;
2131 }
2132
2133 if (!connected) {
2134 /* save original port so we can retry user specified port
2135 later if fall back ports fail this time */
2136
2137 orig_port = server->addr.sockAddr6.sin6_port;
2138 /* do not retry on the same port we just failed on */
2139 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2140 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2141 rc = socket->ops->connect(socket, (struct sockaddr *)
2142 &server->addr.sockAddr6,
2143 sizeof(struct sockaddr_in6), 0);
2144 if (rc >= 0)
2145 connected = true;
2146 }
2147 }
2148 if (!connected) {
2149 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2150 rc = socket->ops->connect(socket, (struct sockaddr *)
2151 &server->addr.sockAddr6,
2152 sizeof(struct sockaddr_in6), 0);
2153 if (rc >= 0)
2154 connected = true;
2155 }
2156
2157 /* give up here - unless we want to retry on different
2158 protocol families some day */
2159 if (!connected) {
2160 if (orig_port)
2161 server->addr.sockAddr6.sin6_port = orig_port;
2162 cFYI(1, "Error %d connecting to server via ipv6", rc);
2163 sock_release(socket);
2164 server->ssocket = NULL;
2165 return rc;
2166 }
2167
2168 /*
2169 * Eventually check for other socket options to change from
2170 * the default. sock_setsockopt not used because it expects
2171 * user space buffer
2172 */
2173 socket->sk->sk_rcvtimeo = 7 * HZ;
2174 socket->sk->sk_sndtimeo = 5 * HZ;
2175
2176 if (server->tcp_nodelay) {
2177 val = 1;
2178 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2179 (char *)&val, sizeof(val));
2180 if (rc)
2181 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2182 }
2183
2184 server->ssocket = socket;
2185
2186 return rc;
2187 }
2188
2189 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2190 struct super_block *sb, struct smb_vol *vol_info)
2191 {
2192 /* if we are reconnecting then should we check to see if
2193 * any requested capabilities changed locally e.g. via
2194 * remount but we can not do much about it here
2195 * if they have (even if we could detect it by the following)
2196 * Perhaps we could add a backpointer to array of sb from tcon
2197 * or if we change to make all sb to same share the same
2198 * sb as NFS - then we only have one backpointer to sb.
2199 * What if we wanted to mount the server share twice once with
2200 * and once without posixacls or posix paths? */
2201 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2202
2203 if (vol_info && vol_info->no_linux_ext) {
2204 tcon->fsUnixInfo.Capability = 0;
2205 tcon->unix_ext = 0; /* Unix Extensions disabled */
2206 cFYI(1, "Linux protocol extensions disabled");
2207 return;
2208 } else if (vol_info)
2209 tcon->unix_ext = 1; /* Unix Extensions supported */
2210
2211 if (tcon->unix_ext == 0) {
2212 cFYI(1, "Unix extensions disabled so not set on reconnect");
2213 return;
2214 }
2215
2216 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2217 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2218
2219 /* check for reconnect case in which we do not
2220 want to change the mount behavior if we can avoid it */
2221 if (vol_info == NULL) {
2222 /* turn off POSIX ACL and PATHNAMES if not set
2223 originally at mount time */
2224 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2225 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2226 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2227 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2228 cERROR(1, "POSIXPATH support change");
2229 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2230 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2231 cERROR(1, "possible reconnect error");
2232 cERROR(1, "server disabled POSIX path support");
2233 }
2234 }
2235
2236 cap &= CIFS_UNIX_CAP_MASK;
2237 if (vol_info && vol_info->no_psx_acl)
2238 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2239 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2240 cFYI(1, "negotiated posix acl support");
2241 if (sb)
2242 sb->s_flags |= MS_POSIXACL;
2243 }
2244
2245 if (vol_info && vol_info->posix_paths == 0)
2246 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2247 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2248 cFYI(1, "negotiate posix pathnames");
2249 if (sb)
2250 CIFS_SB(sb)->mnt_cifs_flags |=
2251 CIFS_MOUNT_POSIX_PATHS;
2252 }
2253
2254 /* We might be setting the path sep back to a different
2255 form if we are reconnecting and the server switched its
2256 posix path capability for this share */
2257 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2258 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2259
2260 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2261 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2262 CIFS_SB(sb)->rsize = 127 * 1024;
2263 cFYI(DBG2, "larger reads not supported by srv");
2264 }
2265 }
2266
2267
2268 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2269 #ifdef CONFIG_CIFS_DEBUG2
2270 if (cap & CIFS_UNIX_FCNTL_CAP)
2271 cFYI(1, "FCNTL cap");
2272 if (cap & CIFS_UNIX_EXTATTR_CAP)
2273 cFYI(1, "EXTATTR cap");
2274 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2275 cFYI(1, "POSIX path cap");
2276 if (cap & CIFS_UNIX_XATTR_CAP)
2277 cFYI(1, "XATTR cap");
2278 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2279 cFYI(1, "POSIX ACL cap");
2280 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2281 cFYI(1, "very large read cap");
2282 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2283 cFYI(1, "very large write cap");
2284 #endif /* CIFS_DEBUG2 */
2285 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2286 if (vol_info == NULL) {
2287 cFYI(1, "resetting capabilities failed");
2288 } else
2289 cERROR(1, "Negotiating Unix capabilities "
2290 "with the server failed. Consider "
2291 "mounting with the Unix Extensions\n"
2292 "disabled, if problems are found, "
2293 "by specifying the nounix mount "
2294 "option.");
2295
2296 }
2297 }
2298 }
2299
2300 static void
2301 convert_delimiter(char *path, char delim)
2302 {
2303 int i;
2304 char old_delim;
2305
2306 if (path == NULL)
2307 return;
2308
2309 if (delim == '/')
2310 old_delim = '\\';
2311 else
2312 old_delim = '/';
2313
2314 for (i = 0; path[i] != '\0'; i++) {
2315 if (path[i] == old_delim)
2316 path[i] = delim;
2317 }
2318 }
2319
2320 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2321 struct cifs_sb_info *cifs_sb)
2322 {
2323 if (pvolume_info->rsize > CIFSMaxBufSize) {
2324 cERROR(1, "rsize %d too large, using MaxBufSize",
2325 pvolume_info->rsize);
2326 cifs_sb->rsize = CIFSMaxBufSize;
2327 } else if ((pvolume_info->rsize) &&
2328 (pvolume_info->rsize <= CIFSMaxBufSize))
2329 cifs_sb->rsize = pvolume_info->rsize;
2330 else /* default */
2331 cifs_sb->rsize = CIFSMaxBufSize;
2332
2333 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2334 cERROR(1, "wsize %d too large, using 4096 instead",
2335 pvolume_info->wsize);
2336 cifs_sb->wsize = 4096;
2337 } else if (pvolume_info->wsize)
2338 cifs_sb->wsize = pvolume_info->wsize;
2339 else
2340 cifs_sb->wsize = min_t(const int,
2341 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2342 127*1024);
2343 /* old default of CIFSMaxBufSize was too small now
2344 that SMB Write2 can send multiple pages in kvec.
2345 RFC1001 does not describe what happens when frame
2346 bigger than 128K is sent so use that as max in
2347 conjunction with 52K kvec constraint on arch with 4K
2348 page size */
2349
2350 if (cifs_sb->rsize < 2048) {
2351 cifs_sb->rsize = 2048;
2352 /* Windows ME may prefer this */
2353 cFYI(1, "readsize set to minimum: 2048");
2354 }
2355 /* calculate prepath */
2356 cifs_sb->prepath = pvolume_info->prepath;
2357 if (cifs_sb->prepath) {
2358 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2359 /* we can not convert the / to \ in the path
2360 separators in the prefixpath yet because we do not
2361 know (until reset_cifs_unix_caps is called later)
2362 whether POSIX PATH CAP is available. We normalize
2363 the / to \ after reset_cifs_unix_caps is called */
2364 pvolume_info->prepath = NULL;
2365 } else
2366 cifs_sb->prepathlen = 0;
2367 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2368 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2369 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2370 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2371 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2372 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2373
2374 if (pvolume_info->noperm)
2375 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2376 if (pvolume_info->setuids)
2377 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2378 if (pvolume_info->server_ino)
2379 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2380 if (pvolume_info->remap)
2381 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2382 if (pvolume_info->no_xattr)
2383 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2384 if (pvolume_info->sfu_emul)
2385 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2386 if (pvolume_info->nobrl)
2387 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2388 if (pvolume_info->nostrictsync)
2389 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2390 if (pvolume_info->mand_lock)
2391 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2392 if (pvolume_info->cifs_acl)
2393 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2394 if (pvolume_info->override_uid)
2395 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2396 if (pvolume_info->override_gid)
2397 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2398 if (pvolume_info->dynperm)
2399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2400 if (pvolume_info->direct_io) {
2401 cFYI(1, "mounting share using direct i/o");
2402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2403 }
2404
2405 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2406 cERROR(1, "mount option dynperm ignored if cifsacl "
2407 "mount option supported");
2408 }
2409
2410 static int
2411 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2412 struct cifs_sb_info *cifs_sb, const char *full_path)
2413 {
2414 int rc;
2415 FILE_ALL_INFO *pfile_info;
2416
2417 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2418 if (pfile_info == NULL)
2419 return -ENOMEM;
2420
2421 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2422 0 /* not legacy */, cifs_sb->local_nls,
2423 cifs_sb->mnt_cifs_flags &
2424 CIFS_MOUNT_MAP_SPECIAL_CHR);
2425 kfree(pfile_info);
2426 return rc;
2427 }
2428
2429 static void
2430 cleanup_volume_info(struct smb_vol **pvolume_info)
2431 {
2432 struct smb_vol *volume_info;
2433
2434 if (!pvolume_info || !*pvolume_info)
2435 return;
2436
2437 volume_info = *pvolume_info;
2438 kzfree(volume_info->password);
2439 kfree(volume_info->UNC);
2440 kfree(volume_info->prepath);
2441 kfree(volume_info);
2442 *pvolume_info = NULL;
2443 return;
2444 }
2445
2446 #ifdef CONFIG_CIFS_DFS_UPCALL
2447 /* build_path_to_root returns full path to root when
2448 * we do not have an exiting connection (tcon) */
2449 static char *
2450 build_unc_path_to_root(const struct smb_vol *volume_info,
2451 const struct cifs_sb_info *cifs_sb)
2452 {
2453 char *full_path;
2454
2455 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2456 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2457 if (full_path == NULL)
2458 return ERR_PTR(-ENOMEM);
2459
2460 strncpy(full_path, volume_info->UNC, unc_len);
2461 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2462 int i;
2463 for (i = 0; i < unc_len; i++) {
2464 if (full_path[i] == '\\')
2465 full_path[i] = '/';
2466 }
2467 }
2468
2469 if (cifs_sb->prepathlen)
2470 strncpy(full_path + unc_len, cifs_sb->prepath,
2471 cifs_sb->prepathlen);
2472
2473 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2474 return full_path;
2475 }
2476 #endif
2477
2478 int
2479 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2480 char *mount_data_global, const char *devname)
2481 {
2482 int rc;
2483 int xid;
2484 struct smb_vol *volume_info;
2485 struct cifsSesInfo *pSesInfo;
2486 struct cifsTconInfo *tcon;
2487 struct TCP_Server_Info *srvTcp;
2488 char *full_path;
2489 char *mount_data = mount_data_global;
2490 #ifdef CONFIG_CIFS_DFS_UPCALL
2491 struct dfs_info3_param *referrals = NULL;
2492 unsigned int num_referrals = 0;
2493 int referral_walks_count = 0;
2494 try_mount_again:
2495 #endif
2496 rc = 0;
2497 tcon = NULL;
2498 pSesInfo = NULL;
2499 srvTcp = NULL;
2500 full_path = NULL;
2501
2502 xid = GetXid();
2503
2504 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2505 if (!volume_info) {
2506 rc = -ENOMEM;
2507 goto out;
2508 }
2509
2510 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2511 rc = -EINVAL;
2512 goto out;
2513 }
2514
2515 if (volume_info->nullauth) {
2516 cFYI(1, "null user");
2517 volume_info->username = "";
2518 } else if (volume_info->username) {
2519 /* BB fixme parse for domain name here */
2520 cFYI(1, "Username: %s", volume_info->username);
2521 } else {
2522 cifserror("No username specified");
2523 /* In userspace mount helper we can get user name from alternate
2524 locations such as env variables and files on disk */
2525 rc = -EINVAL;
2526 goto out;
2527 }
2528
2529 /* this is needed for ASCII cp to Unicode converts */
2530 if (volume_info->iocharset == NULL) {
2531 /* load_nls_default cannot return null */
2532 volume_info->local_nls = load_nls_default();
2533 } else {
2534 volume_info->local_nls = load_nls(volume_info->iocharset);
2535 if (volume_info->local_nls == NULL) {
2536 cERROR(1, "CIFS mount error: iocharset %s not found",
2537 volume_info->iocharset);
2538 rc = -ELIBACC;
2539 goto out;
2540 }
2541 }
2542 cifs_sb->local_nls = volume_info->local_nls;
2543
2544 /* get a reference to a tcp session */
2545 srvTcp = cifs_get_tcp_session(volume_info);
2546 if (IS_ERR(srvTcp)) {
2547 rc = PTR_ERR(srvTcp);
2548 goto out;
2549 }
2550
2551 /* get a reference to a SMB session */
2552 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2553 if (IS_ERR(pSesInfo)) {
2554 rc = PTR_ERR(pSesInfo);
2555 pSesInfo = NULL;
2556 goto mount_fail_check;
2557 }
2558
2559 setup_cifs_sb(volume_info, cifs_sb);
2560 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2561 sb->s_maxbytes = MAX_LFS_FILESIZE;
2562 else
2563 sb->s_maxbytes = MAX_NON_LFS;
2564
2565 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2566 sb->s_time_gran = 100;
2567
2568 /* search for existing tcon to this server share */
2569 tcon = cifs_get_tcon(pSesInfo, volume_info);
2570 if (IS_ERR(tcon)) {
2571 rc = PTR_ERR(tcon);
2572 tcon = NULL;
2573 goto remote_path_check;
2574 }
2575
2576 cifs_sb->tcon = tcon;
2577
2578 /* do not care if following two calls succeed - informational */
2579 if (!tcon->ipc) {
2580 CIFSSMBQFSDeviceInfo(xid, tcon);
2581 CIFSSMBQFSAttributeInfo(xid, tcon);
2582 }
2583
2584 /* tell server which Unix caps we support */
2585 if (tcon->ses->capabilities & CAP_UNIX)
2586 /* reset of caps checks mount to see if unix extensions
2587 disabled for just this mount */
2588 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2589 else
2590 tcon->unix_ext = 0; /* server does not support them */
2591
2592 /* convert forward to back slashes in prepath here if needed */
2593 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2594 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2595
2596 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2597 cifs_sb->rsize = 1024 * 127;
2598 cFYI(DBG2, "no very large read support, rsize now 127K");
2599 }
2600 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2601 cifs_sb->wsize = min(cifs_sb->wsize,
2602 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2603 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2604 cifs_sb->rsize = min(cifs_sb->rsize,
2605 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2606
2607 remote_path_check:
2608 /* check if a whole path (including prepath) is not remote */
2609 if (!rc && cifs_sb->prepathlen && tcon) {
2610 /* build_path_to_root works only when we have a valid tcon */
2611 full_path = cifs_build_path_to_root(cifs_sb);
2612 if (full_path == NULL) {
2613 rc = -ENOMEM;
2614 goto mount_fail_check;
2615 }
2616 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2617 if (rc != -EREMOTE) {
2618 kfree(full_path);
2619 goto mount_fail_check;
2620 }
2621 kfree(full_path);
2622 }
2623
2624 /* get referral if needed */
2625 if (rc == -EREMOTE) {
2626 #ifdef CONFIG_CIFS_DFS_UPCALL
2627 if (referral_walks_count > MAX_NESTED_LINKS) {
2628 /*
2629 * BB: when we implement proper loop detection,
2630 * we will remove this check. But now we need it
2631 * to prevent an indefinite loop if 'DFS tree' is
2632 * misconfigured (i.e. has loops).
2633 */
2634 rc = -ELOOP;
2635 goto mount_fail_check;
2636 }
2637 /* convert forward to back slashes in prepath here if needed */
2638 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2639 convert_delimiter(cifs_sb->prepath,
2640 CIFS_DIR_SEP(cifs_sb));
2641 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2642 if (IS_ERR(full_path)) {
2643 rc = PTR_ERR(full_path);
2644 goto mount_fail_check;
2645 }
2646
2647 cFYI(1, "Getting referral for: %s", full_path);
2648 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2649 cifs_sb->local_nls, &num_referrals, &referrals,
2650 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2651 if (!rc && num_referrals > 0) {
2652 char *fake_devname = NULL;
2653
2654 if (mount_data != mount_data_global)
2655 kfree(mount_data);
2656
2657 mount_data = cifs_compose_mount_options(
2658 cifs_sb->mountdata, full_path + 1,
2659 referrals, &fake_devname);
2660
2661 free_dfs_info_array(referrals, num_referrals);
2662 kfree(fake_devname);
2663 kfree(full_path);
2664
2665 if (IS_ERR(mount_data)) {
2666 rc = PTR_ERR(mount_data);
2667 mount_data = NULL;
2668 goto mount_fail_check;
2669 }
2670
2671 if (tcon)
2672 cifs_put_tcon(tcon);
2673 else if (pSesInfo)
2674 cifs_put_smb_ses(pSesInfo);
2675
2676 cleanup_volume_info(&volume_info);
2677 referral_walks_count++;
2678 FreeXid(xid);
2679 goto try_mount_again;
2680 }
2681 #else /* No DFS support, return error on mount */
2682 rc = -EOPNOTSUPP;
2683 #endif
2684 }
2685
2686 mount_fail_check:
2687 /* on error free sesinfo and tcon struct if needed */
2688 if (rc) {
2689 if (mount_data != mount_data_global)
2690 kfree(mount_data);
2691 /* If find_unc succeeded then rc == 0 so we can not end */
2692 /* up accidently freeing someone elses tcon struct */
2693 if (tcon)
2694 cifs_put_tcon(tcon);
2695 else if (pSesInfo)
2696 cifs_put_smb_ses(pSesInfo);
2697 else
2698 cifs_put_tcp_session(srvTcp);
2699 goto out;
2700 }
2701
2702 /* volume_info->password is freed above when existing session found
2703 (in which case it is not needed anymore) but when new sesion is created
2704 the password ptr is put in the new session structure (in which case the
2705 password will be freed at unmount time) */
2706 out:
2707 /* zero out password before freeing */
2708 cleanup_volume_info(&volume_info);
2709 FreeXid(xid);
2710 return rc;
2711 }
2712
2713 int
2714 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2715 const char *tree, struct cifsTconInfo *tcon,
2716 const struct nls_table *nls_codepage)
2717 {
2718 struct smb_hdr *smb_buffer;
2719 struct smb_hdr *smb_buffer_response;
2720 TCONX_REQ *pSMB;
2721 TCONX_RSP *pSMBr;
2722 unsigned char *bcc_ptr;
2723 int rc = 0;
2724 int length, bytes_left;
2725 __u16 count;
2726
2727 if (ses == NULL)
2728 return -EIO;
2729
2730 smb_buffer = cifs_buf_get();
2731 if (smb_buffer == NULL)
2732 return -ENOMEM;
2733
2734 smb_buffer_response = smb_buffer;
2735
2736 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2737 NULL /*no tid */ , 4 /*wct */ );
2738
2739 smb_buffer->Mid = GetNextMid(ses->server);
2740 smb_buffer->Uid = ses->Suid;
2741 pSMB = (TCONX_REQ *) smb_buffer;
2742 pSMBr = (TCONX_RSP *) smb_buffer_response;
2743
2744 pSMB->AndXCommand = 0xFF;
2745 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2746 bcc_ptr = &pSMB->Password[0];
2747 if ((ses->server->secMode) & SECMODE_USER) {
2748 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2749 *bcc_ptr = 0; /* password is null byte */
2750 bcc_ptr++; /* skip password */
2751 /* already aligned so no need to do it below */
2752 } else {
2753 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2754 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2755 specified as required (when that support is added to
2756 the vfs in the future) as only NTLM or the much
2757 weaker LANMAN (which we do not send by default) is accepted
2758 by Samba (not sure whether other servers allow
2759 NTLMv2 password here) */
2760 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2761 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2762 (ses->server->secType == LANMAN))
2763 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2764 ses->server->secMode &
2765 SECMODE_PW_ENCRYPT ? true : false,
2766 bcc_ptr);
2767 else
2768 #endif /* CIFS_WEAK_PW_HASH */
2769 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2770 bcc_ptr);
2771
2772 bcc_ptr += CIFS_SESS_KEY_SIZE;
2773 if (ses->capabilities & CAP_UNICODE) {
2774 /* must align unicode strings */
2775 *bcc_ptr = 0; /* null byte password */
2776 bcc_ptr++;
2777 }
2778 }
2779
2780 if (ses->server->secMode &
2781 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2782 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2783
2784 if (ses->capabilities & CAP_STATUS32) {
2785 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2786 }
2787 if (ses->capabilities & CAP_DFS) {
2788 smb_buffer->Flags2 |= SMBFLG2_DFS;
2789 }
2790 if (ses->capabilities & CAP_UNICODE) {
2791 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2792 length =
2793 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2794 6 /* max utf8 char length in bytes */ *
2795 (/* server len*/ + 256 /* share len */), nls_codepage);
2796 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2797 bcc_ptr += 2; /* skip trailing null */
2798 } else { /* ASCII */
2799 strcpy(bcc_ptr, tree);
2800 bcc_ptr += strlen(tree) + 1;
2801 }
2802 strcpy(bcc_ptr, "?????");
2803 bcc_ptr += strlen("?????");
2804 bcc_ptr += 1;
2805 count = bcc_ptr - &pSMB->Password[0];
2806 pSMB->hdr.smb_buf_length += count;
2807 pSMB->ByteCount = cpu_to_le16(count);
2808
2809 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2810 CIFS_STD_OP);
2811
2812 /* above now done in SendReceive */
2813 if ((rc == 0) && (tcon != NULL)) {
2814 bool is_unicode;
2815
2816 tcon->tidStatus = CifsGood;
2817 tcon->need_reconnect = false;
2818 tcon->tid = smb_buffer_response->Tid;
2819 bcc_ptr = pByteArea(smb_buffer_response);
2820 bytes_left = BCC(smb_buffer_response);
2821 length = strnlen(bcc_ptr, bytes_left - 2);
2822 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2823 is_unicode = true;
2824 else
2825 is_unicode = false;
2826
2827
2828 /* skip service field (NB: this field is always ASCII) */
2829 if (length == 3) {
2830 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2831 (bcc_ptr[2] == 'C')) {
2832 cFYI(1, "IPC connection");
2833 tcon->ipc = 1;
2834 }
2835 } else if (length == 2) {
2836 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2837 /* the most common case */
2838 cFYI(1, "disk share connection");
2839 }
2840 }
2841 bcc_ptr += length + 1;
2842 bytes_left -= (length + 1);
2843 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2844
2845 /* mostly informational -- no need to fail on error here */
2846 kfree(tcon->nativeFileSystem);
2847 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2848 bytes_left, is_unicode,
2849 nls_codepage);
2850
2851 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2852
2853 if ((smb_buffer_response->WordCount == 3) ||
2854 (smb_buffer_response->WordCount == 7))
2855 /* field is in same location */
2856 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2857 else
2858 tcon->Flags = 0;
2859 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2860 } else if ((rc == 0) && tcon == NULL) {
2861 /* all we need to save for IPC$ connection */
2862 ses->ipc_tid = smb_buffer_response->Tid;
2863 }
2864
2865 cifs_buf_release(smb_buffer);
2866 return rc;
2867 }
2868
2869 int
2870 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2871 {
2872 int rc = 0;
2873 char *tmp;
2874
2875 if (cifs_sb->tcon)
2876 cifs_put_tcon(cifs_sb->tcon);
2877
2878 cifs_sb->tcon = NULL;
2879 tmp = cifs_sb->prepath;
2880 cifs_sb->prepathlen = 0;
2881 cifs_sb->prepath = NULL;
2882 kfree(tmp);
2883
2884 return rc;
2885 }
2886
2887 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
2888 {
2889 int rc = 0;
2890 struct TCP_Server_Info *server = ses->server;
2891
2892 /* only send once per connect */
2893 if (server->maxBuf != 0)
2894 return 0;
2895
2896 rc = CIFSSMBNegotiate(xid, ses);
2897 if (rc == -EAGAIN) {
2898 /* retry only once on 1st time connection */
2899 rc = CIFSSMBNegotiate(xid, ses);
2900 if (rc == -EAGAIN)
2901 rc = -EHOSTDOWN;
2902 }
2903 if (rc == 0) {
2904 spin_lock(&GlobalMid_Lock);
2905 if (server->tcpStatus != CifsExiting)
2906 server->tcpStatus = CifsGood;
2907 else
2908 rc = -EHOSTDOWN;
2909 spin_unlock(&GlobalMid_Lock);
2910
2911 }
2912
2913 return rc;
2914 }
2915
2916
2917 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
2918 struct nls_table *nls_info)
2919 {
2920 int rc = 0;
2921 struct TCP_Server_Info *server = ses->server;
2922
2923 ses->flags = 0;
2924 ses->capabilities = server->capabilities;
2925 if (linuxExtEnabled == 0)
2926 ses->capabilities &= (~CAP_UNIX);
2927
2928 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2929 server->secMode, server->capabilities, server->timeAdj);
2930
2931 rc = CIFS_SessSetup(xid, ses, nls_info);
2932 if (rc) {
2933 cERROR(1, "Send error in SessSetup = %d", rc);
2934 } else {
2935 cFYI(1, "CIFS Session Established successfully");
2936 spin_lock(&GlobalMid_Lock);
2937 ses->status = CifsGood;
2938 ses->need_reconnect = false;
2939 spin_unlock(&GlobalMid_Lock);
2940 }
2941
2942 return rc;
2943 }
2944
Linux with added FPC-III support