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[CIFS] Neaten cERROR and cFYI macros, reduce text space
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob58a2109e7b33a968d256c470c6055e12c0b8ea0f
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 };
106
107 static int ipv4_connect(struct TCP_Server_Info *server);
108 static int ipv6_connect(struct TCP_Server_Info *server);
109
110 /*
111 * cifs tcp session reconnection
112 *
113 * mark tcp session as reconnecting so temporarily locked
114 * mark all smb sessions as reconnecting for tcp session
115 * reconnect tcp session
116 * wake up waiters on reconnection? - (not needed currently)
117 */
118 static int
119 cifs_reconnect(struct TCP_Server_Info *server)
120 {
121 int rc = 0;
122 struct list_head *tmp, *tmp2;
123 struct cifsSesInfo *ses;
124 struct cifsTconInfo *tcon;
125 struct mid_q_entry *mid_entry;
126
127 spin_lock(&GlobalMid_Lock);
128 if (server->tcpStatus == CifsExiting) {
129 /* the demux thread will exit normally
130 next time through the loop */
131 spin_unlock(&GlobalMid_Lock);
132 return rc;
133 } else
134 server->tcpStatus = CifsNeedReconnect;
135 spin_unlock(&GlobalMid_Lock);
136 server->maxBuf = 0;
137
138 cFYI(1, "Reconnecting tcp session");
139
140 /* before reconnecting the tcp session, mark the smb session (uid)
141 and the tid bad so they are not used until reconnected */
142 read_lock(&cifs_tcp_ses_lock);
143 list_for_each(tmp, &server->smb_ses_list) {
144 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
145 ses->need_reconnect = true;
146 ses->ipc_tid = 0;
147 list_for_each(tmp2, &ses->tcon_list) {
148 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
149 tcon->need_reconnect = true;
150 }
151 }
152 read_unlock(&cifs_tcp_ses_lock);
153 /* do not want to be sending data on a socket we are freeing */
154 mutex_lock(&server->srv_mutex);
155 if (server->ssocket) {
156 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
157 server->ssocket->flags);
158 kernel_sock_shutdown(server->ssocket, SHUT_WR);
159 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
160 server->ssocket->state,
161 server->ssocket->flags);
162 sock_release(server->ssocket);
163 server->ssocket = NULL;
164 }
165
166 spin_lock(&GlobalMid_Lock);
167 list_for_each(tmp, &server->pending_mid_q) {
168 mid_entry = list_entry(tmp, struct
169 mid_q_entry,
170 qhead);
171 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
172 /* Mark other intransit requests as needing
173 retry so we do not immediately mark the
174 session bad again (ie after we reconnect
175 below) as they timeout too */
176 mid_entry->midState = MID_RETRY_NEEDED;
177 }
178 }
179 spin_unlock(&GlobalMid_Lock);
180 mutex_unlock(&server->srv_mutex);
181
182 while ((server->tcpStatus != CifsExiting) &&
183 (server->tcpStatus != CifsGood)) {
184 try_to_freeze();
185 if (server->addr.sockAddr6.sin6_family == AF_INET6)
186 rc = ipv6_connect(server);
187 else
188 rc = ipv4_connect(server);
189 if (rc) {
190 cFYI(1, "reconnect error %d", rc);
191 msleep(3000);
192 } else {
193 atomic_inc(&tcpSesReconnectCount);
194 spin_lock(&GlobalMid_Lock);
195 if (server->tcpStatus != CifsExiting)
196 server->tcpStatus = CifsGood;
197 server->sequence_number = 0;
198 spin_unlock(&GlobalMid_Lock);
199 /* atomic_set(&server->inFlight,0);*/
200 wake_up(&server->response_q);
201 }
202 }
203 return rc;
204 }
205
206 /*
207 return codes:
208 0 not a transact2, or all data present
209 >0 transact2 with that much data missing
210 -EINVAL = invalid transact2
211
212 */
213 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
214 {
215 struct smb_t2_rsp *pSMBt;
216 int total_data_size;
217 int data_in_this_rsp;
218 int remaining;
219
220 if (pSMB->Command != SMB_COM_TRANSACTION2)
221 return 0;
222
223 /* check for plausible wct, bcc and t2 data and parm sizes */
224 /* check for parm and data offset going beyond end of smb */
225 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
226 cFYI(1, "invalid transact2 word count");
227 return -EINVAL;
228 }
229
230 pSMBt = (struct smb_t2_rsp *)pSMB;
231
232 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
233 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
234
235 remaining = total_data_size - data_in_this_rsp;
236
237 if (remaining == 0)
238 return 0;
239 else if (remaining < 0) {
240 cFYI(1, "total data %d smaller than data in frame %d",
241 total_data_size, data_in_this_rsp);
242 return -EINVAL;
243 } else {
244 cFYI(1, "missing %d bytes from transact2, check next response",
245 remaining);
246 if (total_data_size > maxBufSize) {
247 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
248 total_data_size, maxBufSize);
249 return -EINVAL;
250 }
251 return remaining;
252 }
253 }
254
255 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
256 {
257 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
258 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
259 int total_data_size;
260 int total_in_buf;
261 int remaining;
262 int total_in_buf2;
263 char *data_area_of_target;
264 char *data_area_of_buf2;
265 __u16 byte_count;
266
267 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
268
269 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
270 cFYI(1, "total data size of primary and secondary t2 differ");
271 }
272
273 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
274
275 remaining = total_data_size - total_in_buf;
276
277 if (remaining < 0)
278 return -EINVAL;
279
280 if (remaining == 0) /* nothing to do, ignore */
281 return 0;
282
283 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
284 if (remaining < total_in_buf2) {
285 cFYI(1, "transact2 2nd response contains too much data");
286 }
287
288 /* find end of first SMB data area */
289 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
290 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
291 /* validate target area */
292
293 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
294 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
295
296 data_area_of_target += total_in_buf;
297
298 /* copy second buffer into end of first buffer */
299 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
300 total_in_buf += total_in_buf2;
301 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
302 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
303 byte_count += total_in_buf2;
304 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
305
306 byte_count = pTargetSMB->smb_buf_length;
307 byte_count += total_in_buf2;
308
309 /* BB also add check that we are not beyond maximum buffer size */
310
311 pTargetSMB->smb_buf_length = byte_count;
312
313 if (remaining == total_in_buf2) {
314 cFYI(1, "found the last secondary response");
315 return 0; /* we are done */
316 } else /* more responses to go */
317 return 1;
318
319 }
320
321 static int
322 cifs_demultiplex_thread(struct TCP_Server_Info *server)
323 {
324 int length;
325 unsigned int pdu_length, total_read;
326 struct smb_hdr *smb_buffer = NULL;
327 struct smb_hdr *bigbuf = NULL;
328 struct smb_hdr *smallbuf = NULL;
329 struct msghdr smb_msg;
330 struct kvec iov;
331 struct socket *csocket = server->ssocket;
332 struct list_head *tmp;
333 struct cifsSesInfo *ses;
334 struct task_struct *task_to_wake = NULL;
335 struct mid_q_entry *mid_entry;
336 char temp;
337 bool isLargeBuf = false;
338 bool isMultiRsp;
339 int reconnect;
340
341 current->flags |= PF_MEMALLOC;
342 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
343
344 length = atomic_inc_return(&tcpSesAllocCount);
345 if (length > 1)
346 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
347 GFP_KERNEL);
348
349 set_freezable();
350 while (server->tcpStatus != CifsExiting) {
351 if (try_to_freeze())
352 continue;
353 if (bigbuf == NULL) {
354 bigbuf = cifs_buf_get();
355 if (!bigbuf) {
356 cERROR(1, "No memory for large SMB response");
357 msleep(3000);
358 /* retry will check if exiting */
359 continue;
360 }
361 } else if (isLargeBuf) {
362 /* we are reusing a dirty large buf, clear its start */
363 memset(bigbuf, 0, sizeof(struct smb_hdr));
364 }
365
366 if (smallbuf == NULL) {
367 smallbuf = cifs_small_buf_get();
368 if (!smallbuf) {
369 cERROR(1, "No memory for SMB response");
370 msleep(1000);
371 /* retry will check if exiting */
372 continue;
373 }
374 /* beginning of smb buffer is cleared in our buf_get */
375 } else /* if existing small buf clear beginning */
376 memset(smallbuf, 0, sizeof(struct smb_hdr));
377
378 isLargeBuf = false;
379 isMultiRsp = false;
380 smb_buffer = smallbuf;
381 iov.iov_base = smb_buffer;
382 iov.iov_len = 4;
383 smb_msg.msg_control = NULL;
384 smb_msg.msg_controllen = 0;
385 pdu_length = 4; /* enough to get RFC1001 header */
386 incomplete_rcv:
387 length =
388 kernel_recvmsg(csocket, &smb_msg,
389 &iov, 1, pdu_length, 0 /* BB other flags? */);
390
391 if (server->tcpStatus == CifsExiting) {
392 break;
393 } else if (server->tcpStatus == CifsNeedReconnect) {
394 cFYI(1, "Reconnect after server stopped responding");
395 cifs_reconnect(server);
396 cFYI(1, "call to reconnect done");
397 csocket = server->ssocket;
398 continue;
399 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
400 msleep(1); /* minimum sleep to prevent looping
401 allowing socket to clear and app threads to set
402 tcpStatus CifsNeedReconnect if server hung */
403 if (pdu_length < 4) {
404 iov.iov_base = (4 - pdu_length) +
405 (char *)smb_buffer;
406 iov.iov_len = pdu_length;
407 smb_msg.msg_control = NULL;
408 smb_msg.msg_controllen = 0;
409 goto incomplete_rcv;
410 } else
411 continue;
412 } else if (length <= 0) {
413 if (server->tcpStatus == CifsNew) {
414 cFYI(1, "tcp session abend after SMBnegprot");
415 /* some servers kill the TCP session rather than
416 returning an SMB negprot error, in which
417 case reconnecting here is not going to help,
418 and so simply return error to mount */
419 break;
420 }
421 if (!try_to_freeze() && (length == -EINTR)) {
422 cFYI(1, "cifsd thread killed");
423 break;
424 }
425 cFYI(1, "Reconnect after unexpected peek error %d",
426 length);
427 cifs_reconnect(server);
428 csocket = server->ssocket;
429 wake_up(&server->response_q);
430 continue;
431 } else if (length < pdu_length) {
432 cFYI(1, "requested %d bytes but only got %d bytes",
433 pdu_length, length);
434 pdu_length -= length;
435 msleep(1);
436 goto incomplete_rcv;
437 }
438
439 /* The right amount was read from socket - 4 bytes */
440 /* so we can now interpret the length field */
441
442 /* the first byte big endian of the length field,
443 is actually not part of the length but the type
444 with the most common, zero, as regular data */
445 temp = *((char *) smb_buffer);
446
447 /* Note that FC 1001 length is big endian on the wire,
448 but we convert it here so it is always manipulated
449 as host byte order */
450 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
451 smb_buffer->smb_buf_length = pdu_length;
452
453 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
454
455 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
456 continue;
457 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
458 cFYI(1, "Good RFC 1002 session rsp");
459 continue;
460 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
461 /* we get this from Windows 98 instead of
462 an error on SMB negprot response */
463 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
464 pdu_length);
465 if (server->tcpStatus == CifsNew) {
466 /* if nack on negprot (rather than
467 ret of smb negprot error) reconnecting
468 not going to help, ret error to mount */
469 break;
470 } else {
471 /* give server a second to
472 clean up before reconnect attempt */
473 msleep(1000);
474 /* always try 445 first on reconnect
475 since we get NACK on some if we ever
476 connected to port 139 (the NACK is
477 since we do not begin with RFC1001
478 session initialize frame) */
479 server->addr.sockAddr.sin_port =
480 htons(CIFS_PORT);
481 cifs_reconnect(server);
482 csocket = server->ssocket;
483 wake_up(&server->response_q);
484 continue;
485 }
486 } else if (temp != (char) 0) {
487 cERROR(1, "Unknown RFC 1002 frame");
488 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
489 length);
490 cifs_reconnect(server);
491 csocket = server->ssocket;
492 continue;
493 }
494
495 /* else we have an SMB response */
496 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
497 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
498 cERROR(1, "Invalid size SMB length %d pdu_length %d",
499 length, pdu_length+4);
500 cifs_reconnect(server);
501 csocket = server->ssocket;
502 wake_up(&server->response_q);
503 continue;
504 }
505
506 /* else length ok */
507 reconnect = 0;
508
509 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
510 isLargeBuf = true;
511 memcpy(bigbuf, smallbuf, 4);
512 smb_buffer = bigbuf;
513 }
514 length = 0;
515 iov.iov_base = 4 + (char *)smb_buffer;
516 iov.iov_len = pdu_length;
517 for (total_read = 0; total_read < pdu_length;
518 total_read += length) {
519 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
520 pdu_length - total_read, 0);
521 if ((server->tcpStatus == CifsExiting) ||
522 (length == -EINTR)) {
523 /* then will exit */
524 reconnect = 2;
525 break;
526 } else if (server->tcpStatus == CifsNeedReconnect) {
527 cifs_reconnect(server);
528 csocket = server->ssocket;
529 /* Reconnect wakes up rspns q */
530 /* Now we will reread sock */
531 reconnect = 1;
532 break;
533 } else if ((length == -ERESTARTSYS) ||
534 (length == -EAGAIN)) {
535 msleep(1); /* minimum sleep to prevent looping,
536 allowing socket to clear and app
537 threads to set tcpStatus
538 CifsNeedReconnect if server hung*/
539 length = 0;
540 continue;
541 } else if (length <= 0) {
542 cERROR(1, "Received no data, expecting %d",
543 pdu_length - total_read);
544 cifs_reconnect(server);
545 csocket = server->ssocket;
546 reconnect = 1;
547 break;
548 }
549 }
550 if (reconnect == 2)
551 break;
552 else if (reconnect == 1)
553 continue;
554
555 length += 4; /* account for rfc1002 hdr */
556
557
558 dump_smb(smb_buffer, length);
559 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
560 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
561 continue;
562 }
563
564
565 task_to_wake = NULL;
566 spin_lock(&GlobalMid_Lock);
567 list_for_each(tmp, &server->pending_mid_q) {
568 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
569
570 if ((mid_entry->mid == smb_buffer->Mid) &&
571 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
572 (mid_entry->command == smb_buffer->Command)) {
573 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
574 /* We have a multipart transact2 resp */
575 isMultiRsp = true;
576 if (mid_entry->resp_buf) {
577 /* merge response - fix up 1st*/
578 if (coalesce_t2(smb_buffer,
579 mid_entry->resp_buf)) {
580 mid_entry->multiRsp =
581 true;
582 break;
583 } else {
584 /* all parts received */
585 mid_entry->multiEnd =
586 true;
587 goto multi_t2_fnd;
588 }
589 } else {
590 if (!isLargeBuf) {
591 cERROR(1, "1st trans2 resp needs bigbuf");
592 /* BB maybe we can fix this up, switch
593 to already allocated large buffer? */
594 } else {
595 /* Have first buffer */
596 mid_entry->resp_buf =
597 smb_buffer;
598 mid_entry->largeBuf =
599 true;
600 bigbuf = NULL;
601 }
602 }
603 break;
604 }
605 mid_entry->resp_buf = smb_buffer;
606 mid_entry->largeBuf = isLargeBuf;
607 multi_t2_fnd:
608 task_to_wake = mid_entry->tsk;
609 mid_entry->midState = MID_RESPONSE_RECEIVED;
610 #ifdef CONFIG_CIFS_STATS2
611 mid_entry->when_received = jiffies;
612 #endif
613 /* so we do not time out requests to server
614 which is still responding (since server could
615 be busy but not dead) */
616 server->lstrp = jiffies;
617 break;
618 }
619 }
620 spin_unlock(&GlobalMid_Lock);
621 if (task_to_wake) {
622 /* Was previous buf put in mpx struct for multi-rsp? */
623 if (!isMultiRsp) {
624 /* smb buffer will be freed by user thread */
625 if (isLargeBuf)
626 bigbuf = NULL;
627 else
628 smallbuf = NULL;
629 }
630 wake_up_process(task_to_wake);
631 } else if (!is_valid_oplock_break(smb_buffer, server) &&
632 !isMultiRsp) {
633 cERROR(1, "No task to wake, unknown frame received! "
634 "NumMids %d", midCount.counter);
635 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
636 sizeof(struct smb_hdr));
637 #ifdef CONFIG_CIFS_DEBUG2
638 cifs_dump_detail(smb_buffer);
639 cifs_dump_mids(server);
640 #endif /* CIFS_DEBUG2 */
641
642 }
643 } /* end while !EXITING */
644
645 /* take it off the list, if it's not already */
646 write_lock(&cifs_tcp_ses_lock);
647 list_del_init(&server->tcp_ses_list);
648 write_unlock(&cifs_tcp_ses_lock);
649
650 spin_lock(&GlobalMid_Lock);
651 server->tcpStatus = CifsExiting;
652 spin_unlock(&GlobalMid_Lock);
653 wake_up_all(&server->response_q);
654
655 /* check if we have blocked requests that need to free */
656 /* Note that cifs_max_pending is normally 50, but
657 can be set at module install time to as little as two */
658 spin_lock(&GlobalMid_Lock);
659 if (atomic_read(&server->inFlight) >= cifs_max_pending)
660 atomic_set(&server->inFlight, cifs_max_pending - 1);
661 /* We do not want to set the max_pending too low or we
662 could end up with the counter going negative */
663 spin_unlock(&GlobalMid_Lock);
664 /* Although there should not be any requests blocked on
665 this queue it can not hurt to be paranoid and try to wake up requests
666 that may haven been blocked when more than 50 at time were on the wire
667 to the same server - they now will see the session is in exit state
668 and get out of SendReceive. */
669 wake_up_all(&server->request_q);
670 /* give those requests time to exit */
671 msleep(125);
672
673 if (server->ssocket) {
674 sock_release(csocket);
675 server->ssocket = NULL;
676 }
677 /* buffer usuallly freed in free_mid - need to free it here on exit */
678 cifs_buf_release(bigbuf);
679 if (smallbuf) /* no sense logging a debug message if NULL */
680 cifs_small_buf_release(smallbuf);
681
682 /*
683 * BB: we shouldn't have to do any of this. It shouldn't be
684 * possible to exit from the thread with active SMB sessions
685 */
686 read_lock(&cifs_tcp_ses_lock);
687 if (list_empty(&server->pending_mid_q)) {
688 /* loop through server session structures attached to this and
689 mark them dead */
690 list_for_each(tmp, &server->smb_ses_list) {
691 ses = list_entry(tmp, struct cifsSesInfo,
692 smb_ses_list);
693 ses->status = CifsExiting;
694 ses->server = NULL;
695 }
696 read_unlock(&cifs_tcp_ses_lock);
697 } else {
698 /* although we can not zero the server struct pointer yet,
699 since there are active requests which may depnd on them,
700 mark the corresponding SMB sessions as exiting too */
701 list_for_each(tmp, &server->smb_ses_list) {
702 ses = list_entry(tmp, struct cifsSesInfo,
703 smb_ses_list);
704 ses->status = CifsExiting;
705 }
706
707 spin_lock(&GlobalMid_Lock);
708 list_for_each(tmp, &server->pending_mid_q) {
709 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
710 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
711 cFYI(1, "Clearing Mid 0x%x - waking up ",
712 mid_entry->mid);
713 task_to_wake = mid_entry->tsk;
714 if (task_to_wake)
715 wake_up_process(task_to_wake);
716 }
717 }
718 spin_unlock(&GlobalMid_Lock);
719 read_unlock(&cifs_tcp_ses_lock);
720 /* 1/8th of sec is more than enough time for them to exit */
721 msleep(125);
722 }
723
724 if (!list_empty(&server->pending_mid_q)) {
725 /* mpx threads have not exited yet give them
726 at least the smb send timeout time for long ops */
727 /* due to delays on oplock break requests, we need
728 to wait at least 45 seconds before giving up
729 on a request getting a response and going ahead
730 and killing cifsd */
731 cFYI(1, "Wait for exit from demultiplex thread");
732 msleep(46000);
733 /* if threads still have not exited they are probably never
734 coming home not much else we can do but free the memory */
735 }
736
737 /* last chance to mark ses pointers invalid
738 if there are any pointing to this (e.g
739 if a crazy root user tried to kill cifsd
740 kernel thread explicitly this might happen) */
741 /* BB: This shouldn't be necessary, see above */
742 read_lock(&cifs_tcp_ses_lock);
743 list_for_each(tmp, &server->smb_ses_list) {
744 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
745 ses->server = NULL;
746 }
747 read_unlock(&cifs_tcp_ses_lock);
748
749 kfree(server->hostname);
750 task_to_wake = xchg(&server->tsk, NULL);
751 kfree(server);
752
753 length = atomic_dec_return(&tcpSesAllocCount);
754 if (length > 0)
755 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
756 GFP_KERNEL);
757
758 /* if server->tsk was NULL then wait for a signal before exiting */
759 if (!task_to_wake) {
760 set_current_state(TASK_INTERRUPTIBLE);
761 while (!signal_pending(current)) {
762 schedule();
763 set_current_state(TASK_INTERRUPTIBLE);
764 }
765 set_current_state(TASK_RUNNING);
766 }
767
768 module_put_and_exit(0);
769 }
770
771 /* extract the host portion of the UNC string */
772 static char *
773 extract_hostname(const char *unc)
774 {
775 const char *src;
776 char *dst, *delim;
777 unsigned int len;
778
779 /* skip double chars at beginning of string */
780 /* BB: check validity of these bytes? */
781 src = unc + 2;
782
783 /* delimiter between hostname and sharename is always '\\' now */
784 delim = strchr(src, '\\');
785 if (!delim)
786 return ERR_PTR(-EINVAL);
787
788 len = delim - src;
789 dst = kmalloc((len + 1), GFP_KERNEL);
790 if (dst == NULL)
791 return ERR_PTR(-ENOMEM);
792
793 memcpy(dst, src, len);
794 dst[len] = '\0';
795
796 return dst;
797 }
798
799 static int
800 cifs_parse_mount_options(char *options, const char *devname,
801 struct smb_vol *vol)
802 {
803 char *value;
804 char *data;
805 unsigned int temp_len, i, j;
806 char separator[2];
807 short int override_uid = -1;
808 short int override_gid = -1;
809 bool uid_specified = false;
810 bool gid_specified = false;
811
812 separator[0] = ',';
813 separator[1] = 0;
814
815 if (Local_System_Name[0] != 0)
816 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
817 else {
818 char *nodename = utsname()->nodename;
819 int n = strnlen(nodename, 15);
820 memset(vol->source_rfc1001_name, 0x20, 15);
821 for (i = 0; i < n; i++) {
822 /* does not have to be perfect mapping since field is
823 informational, only used for servers that do not support
824 port 445 and it can be overridden at mount time */
825 vol->source_rfc1001_name[i] = toupper(nodename[i]);
826 }
827 }
828 vol->source_rfc1001_name[15] = 0;
829 /* null target name indicates to use *SMBSERVR default called name
830 if we end up sending RFC1001 session initialize */
831 vol->target_rfc1001_name[0] = 0;
832 vol->linux_uid = current_uid(); /* use current_euid() instead? */
833 vol->linux_gid = current_gid();
834
835 /* default to only allowing write access to owner of the mount */
836 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
837
838 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
839 /* default is always to request posix paths. */
840 vol->posix_paths = 1;
841 /* default to using server inode numbers where available */
842 vol->server_ino = 1;
843
844 if (!options)
845 return 1;
846
847 if (strncmp(options, "sep=", 4) == 0) {
848 if (options[4] != 0) {
849 separator[0] = options[4];
850 options += 5;
851 } else {
852 cFYI(1, "Null separator not allowed");
853 }
854 }
855
856 while ((data = strsep(&options, separator)) != NULL) {
857 if (!*data)
858 continue;
859 if ((value = strchr(data, '=')) != NULL)
860 *value++ = '\0';
861
862 /* Have to parse this before we parse for "user" */
863 if (strnicmp(data, "user_xattr", 10) == 0) {
864 vol->no_xattr = 0;
865 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
866 vol->no_xattr = 1;
867 } else if (strnicmp(data, "user", 4) == 0) {
868 if (!value) {
869 printk(KERN_WARNING
870 "CIFS: invalid or missing username\n");
871 return 1; /* needs_arg; */
872 } else if (!*value) {
873 /* null user, ie anonymous, authentication */
874 vol->nullauth = 1;
875 }
876 if (strnlen(value, 200) < 200) {
877 vol->username = value;
878 } else {
879 printk(KERN_WARNING "CIFS: username too long\n");
880 return 1;
881 }
882 } else if (strnicmp(data, "pass", 4) == 0) {
883 if (!value) {
884 vol->password = NULL;
885 continue;
886 } else if (value[0] == 0) {
887 /* check if string begins with double comma
888 since that would mean the password really
889 does start with a comma, and would not
890 indicate an empty string */
891 if (value[1] != separator[0]) {
892 vol->password = NULL;
893 continue;
894 }
895 }
896 temp_len = strlen(value);
897 /* removed password length check, NTLM passwords
898 can be arbitrarily long */
899
900 /* if comma in password, the string will be
901 prematurely null terminated. Commas in password are
902 specified across the cifs mount interface by a double
903 comma ie ,, and a comma used as in other cases ie ','
904 as a parameter delimiter/separator is single and due
905 to the strsep above is temporarily zeroed. */
906
907 /* NB: password legally can have multiple commas and
908 the only illegal character in a password is null */
909
910 if ((value[temp_len] == 0) &&
911 (value[temp_len+1] == separator[0])) {
912 /* reinsert comma */
913 value[temp_len] = separator[0];
914 temp_len += 2; /* move after second comma */
915 while (value[temp_len] != 0) {
916 if (value[temp_len] == separator[0]) {
917 if (value[temp_len+1] ==
918 separator[0]) {
919 /* skip second comma */
920 temp_len++;
921 } else {
922 /* single comma indicating start
923 of next parm */
924 break;
925 }
926 }
927 temp_len++;
928 }
929 if (value[temp_len] == 0) {
930 options = NULL;
931 } else {
932 value[temp_len] = 0;
933 /* point option to start of next parm */
934 options = value + temp_len + 1;
935 }
936 /* go from value to value + temp_len condensing
937 double commas to singles. Note that this ends up
938 allocating a few bytes too many, which is ok */
939 vol->password = kzalloc(temp_len, GFP_KERNEL);
940 if (vol->password == NULL) {
941 printk(KERN_WARNING "CIFS: no memory "
942 "for password\n");
943 return 1;
944 }
945 for (i = 0, j = 0; i < temp_len; i++, j++) {
946 vol->password[j] = value[i];
947 if (value[i] == separator[0]
948 && value[i+1] == separator[0]) {
949 /* skip second comma */
950 i++;
951 }
952 }
953 vol->password[j] = 0;
954 } else {
955 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
956 if (vol->password == NULL) {
957 printk(KERN_WARNING "CIFS: no memory "
958 "for password\n");
959 return 1;
960 }
961 strcpy(vol->password, value);
962 }
963 } else if (!strnicmp(data, "ip", 2) ||
964 !strnicmp(data, "addr", 4)) {
965 if (!value || !*value) {
966 vol->UNCip = NULL;
967 } else if (strnlen(value, INET6_ADDRSTRLEN) <
968 INET6_ADDRSTRLEN) {
969 vol->UNCip = value;
970 } else {
971 printk(KERN_WARNING "CIFS: ip address "
972 "too long\n");
973 return 1;
974 }
975 } else if (strnicmp(data, "sec", 3) == 0) {
976 if (!value || !*value) {
977 cERROR(1, "no security value specified");
978 continue;
979 } else if (strnicmp(value, "krb5i", 5) == 0) {
980 vol->secFlg |= CIFSSEC_MAY_KRB5 |
981 CIFSSEC_MUST_SIGN;
982 } else if (strnicmp(value, "krb5p", 5) == 0) {
983 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
984 CIFSSEC_MAY_KRB5; */
985 cERROR(1, "Krb5 cifs privacy not supported");
986 return 1;
987 } else if (strnicmp(value, "krb5", 4) == 0) {
988 vol->secFlg |= CIFSSEC_MAY_KRB5;
989 #ifdef CONFIG_CIFS_EXPERIMENTAL
990 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
991 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
992 CIFSSEC_MUST_SIGN;
993 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
994 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
995 #endif
996 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
997 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
998 CIFSSEC_MUST_SIGN;
999 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1000 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1001 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1002 vol->secFlg |= CIFSSEC_MAY_NTLM |
1003 CIFSSEC_MUST_SIGN;
1004 } else if (strnicmp(value, "ntlm", 4) == 0) {
1005 /* ntlm is default so can be turned off too */
1006 vol->secFlg |= CIFSSEC_MAY_NTLM;
1007 } else if (strnicmp(value, "nontlm", 6) == 0) {
1008 /* BB is there a better way to do this? */
1009 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1010 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1011 } else if (strnicmp(value, "lanman", 6) == 0) {
1012 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1013 #endif
1014 } else if (strnicmp(value, "none", 4) == 0) {
1015 vol->nullauth = 1;
1016 } else {
1017 cERROR(1, "bad security option: %s", value);
1018 return 1;
1019 }
1020 } else if ((strnicmp(data, "unc", 3) == 0)
1021 || (strnicmp(data, "target", 6) == 0)
1022 || (strnicmp(data, "path", 4) == 0)) {
1023 if (!value || !*value) {
1024 printk(KERN_WARNING "CIFS: invalid path to "
1025 "network resource\n");
1026 return 1; /* needs_arg; */
1027 }
1028 if ((temp_len = strnlen(value, 300)) < 300) {
1029 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1030 if (vol->UNC == NULL)
1031 return 1;
1032 strcpy(vol->UNC, value);
1033 if (strncmp(vol->UNC, "//", 2) == 0) {
1034 vol->UNC[0] = '\\';
1035 vol->UNC[1] = '\\';
1036 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1037 printk(KERN_WARNING
1038 "CIFS: UNC Path does not begin "
1039 "with // or \\\\ \n");
1040 return 1;
1041 }
1042 } else {
1043 printk(KERN_WARNING "CIFS: UNC name too long\n");
1044 return 1;
1045 }
1046 } else if ((strnicmp(data, "domain", 3) == 0)
1047 || (strnicmp(data, "workgroup", 5) == 0)) {
1048 if (!value || !*value) {
1049 printk(KERN_WARNING "CIFS: invalid domain name\n");
1050 return 1; /* needs_arg; */
1051 }
1052 /* BB are there cases in which a comma can be valid in
1053 a domain name and need special handling? */
1054 if (strnlen(value, 256) < 256) {
1055 vol->domainname = value;
1056 cFYI(1, "Domain name set");
1057 } else {
1058 printk(KERN_WARNING "CIFS: domain name too "
1059 "long\n");
1060 return 1;
1061 }
1062 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1063 if (!value || !*value) {
1064 printk(KERN_WARNING
1065 "CIFS: invalid path prefix\n");
1066 return 1; /* needs_argument */
1067 }
1068 if ((temp_len = strnlen(value, 1024)) < 1024) {
1069 if (value[0] != '/')
1070 temp_len++; /* missing leading slash */
1071 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1072 if (vol->prepath == NULL)
1073 return 1;
1074 if (value[0] != '/') {
1075 vol->prepath[0] = '/';
1076 strcpy(vol->prepath+1, value);
1077 } else
1078 strcpy(vol->prepath, value);
1079 cFYI(1, "prefix path %s", vol->prepath);
1080 } else {
1081 printk(KERN_WARNING "CIFS: prefix too long\n");
1082 return 1;
1083 }
1084 } else if (strnicmp(data, "iocharset", 9) == 0) {
1085 if (!value || !*value) {
1086 printk(KERN_WARNING "CIFS: invalid iocharset "
1087 "specified\n");
1088 return 1; /* needs_arg; */
1089 }
1090 if (strnlen(value, 65) < 65) {
1091 if (strnicmp(value, "default", 7))
1092 vol->iocharset = value;
1093 /* if iocharset not set then load_nls_default
1094 is used by caller */
1095 cFYI(1, "iocharset set to %s", value);
1096 } else {
1097 printk(KERN_WARNING "CIFS: iocharset name "
1098 "too long.\n");
1099 return 1;
1100 }
1101 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1102 vol->linux_uid = simple_strtoul(value, &value, 0);
1103 uid_specified = true;
1104 } else if (!strnicmp(data, "forceuid", 8)) {
1105 override_uid = 1;
1106 } else if (!strnicmp(data, "noforceuid", 10)) {
1107 override_uid = 0;
1108 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1109 vol->linux_gid = simple_strtoul(value, &value, 0);
1110 gid_specified = true;
1111 } else if (!strnicmp(data, "forcegid", 8)) {
1112 override_gid = 1;
1113 } else if (!strnicmp(data, "noforcegid", 10)) {
1114 override_gid = 0;
1115 } else if (strnicmp(data, "file_mode", 4) == 0) {
1116 if (value && *value) {
1117 vol->file_mode =
1118 simple_strtoul(value, &value, 0);
1119 }
1120 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1121 if (value && *value) {
1122 vol->dir_mode =
1123 simple_strtoul(value, &value, 0);
1124 }
1125 } else if (strnicmp(data, "dirmode", 4) == 0) {
1126 if (value && *value) {
1127 vol->dir_mode =
1128 simple_strtoul(value, &value, 0);
1129 }
1130 } else if (strnicmp(data, "port", 4) == 0) {
1131 if (value && *value) {
1132 vol->port =
1133 simple_strtoul(value, &value, 0);
1134 }
1135 } else if (strnicmp(data, "rsize", 5) == 0) {
1136 if (value && *value) {
1137 vol->rsize =
1138 simple_strtoul(value, &value, 0);
1139 }
1140 } else if (strnicmp(data, "wsize", 5) == 0) {
1141 if (value && *value) {
1142 vol->wsize =
1143 simple_strtoul(value, &value, 0);
1144 }
1145 } else if (strnicmp(data, "sockopt", 5) == 0) {
1146 if (!value || !*value) {
1147 cERROR(1, "no socket option specified");
1148 continue;
1149 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1150 vol->sockopt_tcp_nodelay = 1;
1151 }
1152 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1153 if (!value || !*value || (*value == ' ')) {
1154 cFYI(1, "invalid (empty) netbiosname");
1155 } else {
1156 memset(vol->source_rfc1001_name, 0x20, 15);
1157 for (i = 0; i < 15; i++) {
1158 /* BB are there cases in which a comma can be
1159 valid in this workstation netbios name (and need
1160 special handling)? */
1161
1162 /* We do not uppercase netbiosname for user */
1163 if (value[i] == 0)
1164 break;
1165 else
1166 vol->source_rfc1001_name[i] =
1167 value[i];
1168 }
1169 /* The string has 16th byte zero still from
1170 set at top of the function */
1171 if ((i == 15) && (value[i] != 0))
1172 printk(KERN_WARNING "CIFS: netbiosname"
1173 " longer than 15 truncated.\n");
1174 }
1175 } else if (strnicmp(data, "servern", 7) == 0) {
1176 /* servernetbiosname specified override *SMBSERVER */
1177 if (!value || !*value || (*value == ' ')) {
1178 cFYI(1, "empty server netbiosname specified");
1179 } else {
1180 /* last byte, type, is 0x20 for servr type */
1181 memset(vol->target_rfc1001_name, 0x20, 16);
1182
1183 for (i = 0; i < 15; i++) {
1184 /* BB are there cases in which a comma can be
1185 valid in this workstation netbios name
1186 (and need special handling)? */
1187
1188 /* user or mount helper must uppercase
1189 the netbiosname */
1190 if (value[i] == 0)
1191 break;
1192 else
1193 vol->target_rfc1001_name[i] =
1194 value[i];
1195 }
1196 /* The string has 16th byte zero still from
1197 set at top of the function */
1198 if ((i == 15) && (value[i] != 0))
1199 printk(KERN_WARNING "CIFS: server net"
1200 "biosname longer than 15 truncated.\n");
1201 }
1202 } else if (strnicmp(data, "credentials", 4) == 0) {
1203 /* ignore */
1204 } else if (strnicmp(data, "version", 3) == 0) {
1205 /* ignore */
1206 } else if (strnicmp(data, "guest", 5) == 0) {
1207 /* ignore */
1208 } else if (strnicmp(data, "rw", 2) == 0) {
1209 /* ignore */
1210 } else if (strnicmp(data, "ro", 2) == 0) {
1211 /* ignore */
1212 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1213 vol->noblocksnd = 1;
1214 } else if (strnicmp(data, "noautotune", 10) == 0) {
1215 vol->noautotune = 1;
1216 } else if ((strnicmp(data, "suid", 4) == 0) ||
1217 (strnicmp(data, "nosuid", 6) == 0) ||
1218 (strnicmp(data, "exec", 4) == 0) ||
1219 (strnicmp(data, "noexec", 6) == 0) ||
1220 (strnicmp(data, "nodev", 5) == 0) ||
1221 (strnicmp(data, "noauto", 6) == 0) ||
1222 (strnicmp(data, "dev", 3) == 0)) {
1223 /* The mount tool or mount.cifs helper (if present)
1224 uses these opts to set flags, and the flags are read
1225 by the kernel vfs layer before we get here (ie
1226 before read super) so there is no point trying to
1227 parse these options again and set anything and it
1228 is ok to just ignore them */
1229 continue;
1230 } else if (strnicmp(data, "hard", 4) == 0) {
1231 vol->retry = 1;
1232 } else if (strnicmp(data, "soft", 4) == 0) {
1233 vol->retry = 0;
1234 } else if (strnicmp(data, "perm", 4) == 0) {
1235 vol->noperm = 0;
1236 } else if (strnicmp(data, "noperm", 6) == 0) {
1237 vol->noperm = 1;
1238 } else if (strnicmp(data, "mapchars", 8) == 0) {
1239 vol->remap = 1;
1240 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1241 vol->remap = 0;
1242 } else if (strnicmp(data, "sfu", 3) == 0) {
1243 vol->sfu_emul = 1;
1244 } else if (strnicmp(data, "nosfu", 5) == 0) {
1245 vol->sfu_emul = 0;
1246 } else if (strnicmp(data, "nodfs", 5) == 0) {
1247 vol->nodfs = 1;
1248 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1249 vol->posix_paths = 1;
1250 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1251 vol->posix_paths = 0;
1252 } else if (strnicmp(data, "nounix", 6) == 0) {
1253 vol->no_linux_ext = 1;
1254 } else if (strnicmp(data, "nolinux", 7) == 0) {
1255 vol->no_linux_ext = 1;
1256 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1257 (strnicmp(data, "ignorecase", 10) == 0)) {
1258 vol->nocase = 1;
1259 } else if (strnicmp(data, "brl", 3) == 0) {
1260 vol->nobrl = 0;
1261 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1262 (strnicmp(data, "nolock", 6) == 0)) {
1263 vol->nobrl = 1;
1264 /* turn off mandatory locking in mode
1265 if remote locking is turned off since the
1266 local vfs will do advisory */
1267 if (vol->file_mode ==
1268 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1269 vol->file_mode = S_IALLUGO;
1270 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1271 /* will take the shorter form "forcemand" as well */
1272 /* This mount option will force use of mandatory
1273 (DOS/Windows style) byte range locks, instead of
1274 using posix advisory byte range locks, even if the
1275 Unix extensions are available and posix locks would
1276 be supported otherwise. If Unix extensions are not
1277 negotiated this has no effect since mandatory locks
1278 would be used (mandatory locks is all that those
1279 those servers support) */
1280 vol->mand_lock = 1;
1281 } else if (strnicmp(data, "setuids", 7) == 0) {
1282 vol->setuids = 1;
1283 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1284 vol->setuids = 0;
1285 } else if (strnicmp(data, "dynperm", 7) == 0) {
1286 vol->dynperm = true;
1287 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1288 vol->dynperm = false;
1289 } else if (strnicmp(data, "nohard", 6) == 0) {
1290 vol->retry = 0;
1291 } else if (strnicmp(data, "nosoft", 6) == 0) {
1292 vol->retry = 1;
1293 } else if (strnicmp(data, "nointr", 6) == 0) {
1294 vol->intr = 0;
1295 } else if (strnicmp(data, "intr", 4) == 0) {
1296 vol->intr = 1;
1297 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1298 vol->nostrictsync = 1;
1299 } else if (strnicmp(data, "strictsync", 10) == 0) {
1300 vol->nostrictsync = 0;
1301 } else if (strnicmp(data, "serverino", 7) == 0) {
1302 vol->server_ino = 1;
1303 } else if (strnicmp(data, "noserverino", 9) == 0) {
1304 vol->server_ino = 0;
1305 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1306 vol->cifs_acl = 1;
1307 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1308 vol->cifs_acl = 0;
1309 } else if (strnicmp(data, "acl", 3) == 0) {
1310 vol->no_psx_acl = 0;
1311 } else if (strnicmp(data, "noacl", 5) == 0) {
1312 vol->no_psx_acl = 1;
1313 #ifdef CONFIG_CIFS_EXPERIMENTAL
1314 } else if (strnicmp(data, "locallease", 6) == 0) {
1315 vol->local_lease = 1;
1316 #endif
1317 } else if (strnicmp(data, "sign", 4) == 0) {
1318 vol->secFlg |= CIFSSEC_MUST_SIGN;
1319 } else if (strnicmp(data, "seal", 4) == 0) {
1320 /* we do not do the following in secFlags because seal
1321 is a per tree connection (mount) not a per socket
1322 or per-smb connection option in the protocol */
1323 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1324 vol->seal = 1;
1325 } else if (strnicmp(data, "direct", 6) == 0) {
1326 vol->direct_io = 1;
1327 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1328 vol->direct_io = 1;
1329 } else if (strnicmp(data, "noac", 4) == 0) {
1330 printk(KERN_WARNING "CIFS: Mount option noac not "
1331 "supported. Instead set "
1332 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1333 } else
1334 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1335 data);
1336 }
1337 if (vol->UNC == NULL) {
1338 if (devname == NULL) {
1339 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1340 "target\n");
1341 return 1;
1342 }
1343 if ((temp_len = strnlen(devname, 300)) < 300) {
1344 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1345 if (vol->UNC == NULL)
1346 return 1;
1347 strcpy(vol->UNC, devname);
1348 if (strncmp(vol->UNC, "//", 2) == 0) {
1349 vol->UNC[0] = '\\';
1350 vol->UNC[1] = '\\';
1351 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1352 printk(KERN_WARNING "CIFS: UNC Path does not "
1353 "begin with // or \\\\ \n");
1354 return 1;
1355 }
1356 value = strpbrk(vol->UNC+2, "/\\");
1357 if (value)
1358 *value = '\\';
1359 } else {
1360 printk(KERN_WARNING "CIFS: UNC name too long\n");
1361 return 1;
1362 }
1363 }
1364 if (vol->UNCip == NULL)
1365 vol->UNCip = &vol->UNC[2];
1366
1367 if (uid_specified)
1368 vol->override_uid = override_uid;
1369 else if (override_uid == 1)
1370 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1371 "specified with no uid= option.\n");
1372
1373 if (gid_specified)
1374 vol->override_gid = override_gid;
1375 else if (override_gid == 1)
1376 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1377 "specified with no gid= option.\n");
1378
1379 return 0;
1380 }
1381
1382 static struct TCP_Server_Info *
1383 cifs_find_tcp_session(struct sockaddr_storage *addr, unsigned short int port)
1384 {
1385 struct list_head *tmp;
1386 struct TCP_Server_Info *server;
1387 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1388 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1389
1390 write_lock(&cifs_tcp_ses_lock);
1391 list_for_each(tmp, &cifs_tcp_ses_list) {
1392 server = list_entry(tmp, struct TCP_Server_Info,
1393 tcp_ses_list);
1394 /*
1395 * the demux thread can exit on its own while still in CifsNew
1396 * so don't accept any sockets in that state. Since the
1397 * tcpStatus never changes back to CifsNew it's safe to check
1398 * for this without a lock.
1399 */
1400 if (server->tcpStatus == CifsNew)
1401 continue;
1402
1403 switch (addr->ss_family) {
1404 case AF_INET:
1405 if (addr4->sin_addr.s_addr ==
1406 server->addr.sockAddr.sin_addr.s_addr) {
1407 addr4->sin_port = htons(port);
1408 /* user overrode default port? */
1409 if (addr4->sin_port) {
1410 if (addr4->sin_port !=
1411 server->addr.sockAddr.sin_port)
1412 continue;
1413 }
1414 break;
1415 } else
1416 continue;
1417
1418 case AF_INET6:
1419 if (ipv6_addr_equal(&addr6->sin6_addr,
1420 &server->addr.sockAddr6.sin6_addr) &&
1421 (addr6->sin6_scope_id ==
1422 server->addr.sockAddr6.sin6_scope_id)) {
1423 addr6->sin6_port = htons(port);
1424 /* user overrode default port? */
1425 if (addr6->sin6_port) {
1426 if (addr6->sin6_port !=
1427 server->addr.sockAddr6.sin6_port)
1428 continue;
1429 }
1430 break;
1431 } else
1432 continue;
1433 }
1434
1435 ++server->srv_count;
1436 write_unlock(&cifs_tcp_ses_lock);
1437 cFYI(1, "Existing tcp session with server found");
1438 return server;
1439 }
1440 write_unlock(&cifs_tcp_ses_lock);
1441 return NULL;
1442 }
1443
1444 static void
1445 cifs_put_tcp_session(struct TCP_Server_Info *server)
1446 {
1447 struct task_struct *task;
1448
1449 write_lock(&cifs_tcp_ses_lock);
1450 if (--server->srv_count > 0) {
1451 write_unlock(&cifs_tcp_ses_lock);
1452 return;
1453 }
1454
1455 list_del_init(&server->tcp_ses_list);
1456 write_unlock(&cifs_tcp_ses_lock);
1457
1458 spin_lock(&GlobalMid_Lock);
1459 server->tcpStatus = CifsExiting;
1460 spin_unlock(&GlobalMid_Lock);
1461
1462 task = xchg(&server->tsk, NULL);
1463 if (task)
1464 force_sig(SIGKILL, task);
1465 }
1466
1467 static struct TCP_Server_Info *
1468 cifs_get_tcp_session(struct smb_vol *volume_info)
1469 {
1470 struct TCP_Server_Info *tcp_ses = NULL;
1471 struct sockaddr_storage addr;
1472 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1473 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1474 int rc;
1475
1476 memset(&addr, 0, sizeof(struct sockaddr_storage));
1477
1478 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1479
1480 if (volume_info->UNCip && volume_info->UNC) {
1481 rc = cifs_convert_address(volume_info->UNCip, &addr);
1482 if (!rc) {
1483 /* we failed translating address */
1484 rc = -EINVAL;
1485 goto out_err;
1486 }
1487 } else if (volume_info->UNCip) {
1488 /* BB using ip addr as tcp_ses name to connect to the
1489 DFS root below */
1490 cERROR(1, "Connecting to DFS root not implemented yet");
1491 rc = -EINVAL;
1492 goto out_err;
1493 } else /* which tcp_sess DFS root would we conect to */ {
1494 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1495 "unc=//192.168.1.100/public) specified");
1496 rc = -EINVAL;
1497 goto out_err;
1498 }
1499
1500 /* see if we already have a matching tcp_ses */
1501 tcp_ses = cifs_find_tcp_session(&addr, volume_info->port);
1502 if (tcp_ses)
1503 return tcp_ses;
1504
1505 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1506 if (!tcp_ses) {
1507 rc = -ENOMEM;
1508 goto out_err;
1509 }
1510
1511 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1512 if (IS_ERR(tcp_ses->hostname)) {
1513 rc = PTR_ERR(tcp_ses->hostname);
1514 goto out_err;
1515 }
1516
1517 tcp_ses->noblocksnd = volume_info->noblocksnd;
1518 tcp_ses->noautotune = volume_info->noautotune;
1519 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1520 atomic_set(&tcp_ses->inFlight, 0);
1521 init_waitqueue_head(&tcp_ses->response_q);
1522 init_waitqueue_head(&tcp_ses->request_q);
1523 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1524 mutex_init(&tcp_ses->srv_mutex);
1525 memcpy(tcp_ses->workstation_RFC1001_name,
1526 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1527 memcpy(tcp_ses->server_RFC1001_name,
1528 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1529 tcp_ses->sequence_number = 0;
1530 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1531 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1532
1533 /*
1534 * at this point we are the only ones with the pointer
1535 * to the struct since the kernel thread not created yet
1536 * no need to spinlock this init of tcpStatus or srv_count
1537 */
1538 tcp_ses->tcpStatus = CifsNew;
1539 ++tcp_ses->srv_count;
1540
1541 if (addr.ss_family == AF_INET6) {
1542 cFYI(1, "attempting ipv6 connect");
1543 /* BB should we allow ipv6 on port 139? */
1544 /* other OS never observed in Wild doing 139 with v6 */
1545 sin_server6->sin6_port = htons(volume_info->port);
1546 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1547 sizeof(struct sockaddr_in6));
1548 rc = ipv6_connect(tcp_ses);
1549 } else {
1550 sin_server->sin_port = htons(volume_info->port);
1551 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1552 sizeof(struct sockaddr_in));
1553 rc = ipv4_connect(tcp_ses);
1554 }
1555 if (rc < 0) {
1556 cERROR(1, "Error connecting to socket. Aborting operation");
1557 goto out_err;
1558 }
1559
1560 /*
1561 * since we're in a cifs function already, we know that
1562 * this will succeed. No need for try_module_get().
1563 */
1564 __module_get(THIS_MODULE);
1565 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1566 tcp_ses, "cifsd");
1567 if (IS_ERR(tcp_ses->tsk)) {
1568 rc = PTR_ERR(tcp_ses->tsk);
1569 cERROR(1, "error %d create cifsd thread", rc);
1570 module_put(THIS_MODULE);
1571 goto out_err;
1572 }
1573
1574 /* thread spawned, put it on the list */
1575 write_lock(&cifs_tcp_ses_lock);
1576 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1577 write_unlock(&cifs_tcp_ses_lock);
1578
1579 return tcp_ses;
1580
1581 out_err:
1582 if (tcp_ses) {
1583 if (!IS_ERR(tcp_ses->hostname))
1584 kfree(tcp_ses->hostname);
1585 if (tcp_ses->ssocket)
1586 sock_release(tcp_ses->ssocket);
1587 kfree(tcp_ses);
1588 }
1589 return ERR_PTR(rc);
1590 }
1591
1592 static struct cifsSesInfo *
1593 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1594 {
1595 struct list_head *tmp;
1596 struct cifsSesInfo *ses;
1597
1598 write_lock(&cifs_tcp_ses_lock);
1599 list_for_each(tmp, &server->smb_ses_list) {
1600 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1601 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1602 continue;
1603
1604 ++ses->ses_count;
1605 write_unlock(&cifs_tcp_ses_lock);
1606 return ses;
1607 }
1608 write_unlock(&cifs_tcp_ses_lock);
1609 return NULL;
1610 }
1611
1612 static void
1613 cifs_put_smb_ses(struct cifsSesInfo *ses)
1614 {
1615 int xid;
1616 struct TCP_Server_Info *server = ses->server;
1617
1618 write_lock(&cifs_tcp_ses_lock);
1619 if (--ses->ses_count > 0) {
1620 write_unlock(&cifs_tcp_ses_lock);
1621 return;
1622 }
1623
1624 list_del_init(&ses->smb_ses_list);
1625 write_unlock(&cifs_tcp_ses_lock);
1626
1627 if (ses->status == CifsGood) {
1628 xid = GetXid();
1629 CIFSSMBLogoff(xid, ses);
1630 _FreeXid(xid);
1631 }
1632 sesInfoFree(ses);
1633 cifs_put_tcp_session(server);
1634 }
1635
1636 static struct cifsTconInfo *
1637 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1638 {
1639 struct list_head *tmp;
1640 struct cifsTconInfo *tcon;
1641
1642 write_lock(&cifs_tcp_ses_lock);
1643 list_for_each(tmp, &ses->tcon_list) {
1644 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1645 if (tcon->tidStatus == CifsExiting)
1646 continue;
1647 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1648 continue;
1649
1650 ++tcon->tc_count;
1651 write_unlock(&cifs_tcp_ses_lock);
1652 return tcon;
1653 }
1654 write_unlock(&cifs_tcp_ses_lock);
1655 return NULL;
1656 }
1657
1658 static void
1659 cifs_put_tcon(struct cifsTconInfo *tcon)
1660 {
1661 int xid;
1662 struct cifsSesInfo *ses = tcon->ses;
1663
1664 write_lock(&cifs_tcp_ses_lock);
1665 if (--tcon->tc_count > 0) {
1666 write_unlock(&cifs_tcp_ses_lock);
1667 return;
1668 }
1669
1670 list_del_init(&tcon->tcon_list);
1671 write_unlock(&cifs_tcp_ses_lock);
1672
1673 xid = GetXid();
1674 CIFSSMBTDis(xid, tcon);
1675 _FreeXid(xid);
1676
1677 tconInfoFree(tcon);
1678 cifs_put_smb_ses(ses);
1679 }
1680
1681 int
1682 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1683 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1684 struct dfs_info3_param **preferrals, int remap)
1685 {
1686 char *temp_unc;
1687 int rc = 0;
1688
1689 *pnum_referrals = 0;
1690 *preferrals = NULL;
1691
1692 if (pSesInfo->ipc_tid == 0) {
1693 temp_unc = kmalloc(2 /* for slashes */ +
1694 strnlen(pSesInfo->serverName,
1695 SERVER_NAME_LEN_WITH_NULL * 2)
1696 + 1 + 4 /* slash IPC$ */ + 2,
1697 GFP_KERNEL);
1698 if (temp_unc == NULL)
1699 return -ENOMEM;
1700 temp_unc[0] = '\\';
1701 temp_unc[1] = '\\';
1702 strcpy(temp_unc + 2, pSesInfo->serverName);
1703 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1704 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1705 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1706 kfree(temp_unc);
1707 }
1708 if (rc == 0)
1709 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1710 pnum_referrals, nls_codepage, remap);
1711 /* BB map targetUNCs to dfs_info3 structures, here or
1712 in CIFSGetDFSRefer BB */
1713
1714 return rc;
1715 }
1716
1717 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1718 static struct lock_class_key cifs_key[2];
1719 static struct lock_class_key cifs_slock_key[2];
1720
1721 static inline void
1722 cifs_reclassify_socket4(struct socket *sock)
1723 {
1724 struct sock *sk = sock->sk;
1725 BUG_ON(sock_owned_by_user(sk));
1726 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1727 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1728 }
1729
1730 static inline void
1731 cifs_reclassify_socket6(struct socket *sock)
1732 {
1733 struct sock *sk = sock->sk;
1734 BUG_ON(sock_owned_by_user(sk));
1735 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1736 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1737 }
1738 #else
1739 static inline void
1740 cifs_reclassify_socket4(struct socket *sock)
1741 {
1742 }
1743
1744 static inline void
1745 cifs_reclassify_socket6(struct socket *sock)
1746 {
1747 }
1748 #endif
1749
1750 /* See RFC1001 section 14 on representation of Netbios names */
1751 static void rfc1002mangle(char *target, char *source, unsigned int length)
1752 {
1753 unsigned int i, j;
1754
1755 for (i = 0, j = 0; i < (length); i++) {
1756 /* mask a nibble at a time and encode */
1757 target[j] = 'A' + (0x0F & (source[i] >> 4));
1758 target[j+1] = 'A' + (0x0F & source[i]);
1759 j += 2;
1760 }
1761
1762 }
1763
1764
1765 static int
1766 ipv4_connect(struct TCP_Server_Info *server)
1767 {
1768 int rc = 0;
1769 int val;
1770 bool connected = false;
1771 __be16 orig_port = 0;
1772 struct socket *socket = server->ssocket;
1773
1774 if (socket == NULL) {
1775 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1776 IPPROTO_TCP, &socket);
1777 if (rc < 0) {
1778 cERROR(1, "Error %d creating socket", rc);
1779 return rc;
1780 }
1781
1782 /* BB other socket options to set KEEPALIVE, NODELAY? */
1783 cFYI(1, "Socket created");
1784 server->ssocket = socket;
1785 socket->sk->sk_allocation = GFP_NOFS;
1786 cifs_reclassify_socket4(socket);
1787 }
1788
1789 /* user overrode default port */
1790 if (server->addr.sockAddr.sin_port) {
1791 rc = socket->ops->connect(socket, (struct sockaddr *)
1792 &server->addr.sockAddr,
1793 sizeof(struct sockaddr_in), 0);
1794 if (rc >= 0)
1795 connected = true;
1796 }
1797
1798 if (!connected) {
1799 /* save original port so we can retry user specified port
1800 later if fall back ports fail this time */
1801 orig_port = server->addr.sockAddr.sin_port;
1802
1803 /* do not retry on the same port we just failed on */
1804 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1805 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1806 rc = socket->ops->connect(socket,
1807 (struct sockaddr *)
1808 &server->addr.sockAddr,
1809 sizeof(struct sockaddr_in), 0);
1810 if (rc >= 0)
1811 connected = true;
1812 }
1813 }
1814 if (!connected) {
1815 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1816 rc = socket->ops->connect(socket, (struct sockaddr *)
1817 &server->addr.sockAddr,
1818 sizeof(struct sockaddr_in), 0);
1819 if (rc >= 0)
1820 connected = true;
1821 }
1822
1823 /* give up here - unless we want to retry on different
1824 protocol families some day */
1825 if (!connected) {
1826 if (orig_port)
1827 server->addr.sockAddr.sin_port = orig_port;
1828 cFYI(1, "Error %d connecting to server via ipv4", rc);
1829 sock_release(socket);
1830 server->ssocket = NULL;
1831 return rc;
1832 }
1833
1834
1835 /*
1836 * Eventually check for other socket options to change from
1837 * the default. sock_setsockopt not used because it expects
1838 * user space buffer
1839 */
1840 socket->sk->sk_rcvtimeo = 7 * HZ;
1841 socket->sk->sk_sndtimeo = 5 * HZ;
1842
1843 /* make the bufsizes depend on wsize/rsize and max requests */
1844 if (server->noautotune) {
1845 if (socket->sk->sk_sndbuf < (200 * 1024))
1846 socket->sk->sk_sndbuf = 200 * 1024;
1847 if (socket->sk->sk_rcvbuf < (140 * 1024))
1848 socket->sk->sk_rcvbuf = 140 * 1024;
1849 }
1850
1851 if (server->tcp_nodelay) {
1852 val = 1;
1853 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
1854 (char *)&val, sizeof(val));
1855 if (rc)
1856 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
1857 }
1858
1859 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1860 socket->sk->sk_sndbuf,
1861 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
1862
1863 /* send RFC1001 sessinit */
1864 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1865 /* some servers require RFC1001 sessinit before sending
1866 negprot - BB check reconnection in case where second
1867 sessinit is sent but no second negprot */
1868 struct rfc1002_session_packet *ses_init_buf;
1869 struct smb_hdr *smb_buf;
1870 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1871 GFP_KERNEL);
1872 if (ses_init_buf) {
1873 ses_init_buf->trailer.session_req.called_len = 32;
1874 if (server->server_RFC1001_name &&
1875 server->server_RFC1001_name[0] != 0)
1876 rfc1002mangle(ses_init_buf->trailer.
1877 session_req.called_name,
1878 server->server_RFC1001_name,
1879 RFC1001_NAME_LEN_WITH_NULL);
1880 else
1881 rfc1002mangle(ses_init_buf->trailer.
1882 session_req.called_name,
1883 DEFAULT_CIFS_CALLED_NAME,
1884 RFC1001_NAME_LEN_WITH_NULL);
1885
1886 ses_init_buf->trailer.session_req.calling_len = 32;
1887
1888 /* calling name ends in null (byte 16) from old smb
1889 convention. */
1890 if (server->workstation_RFC1001_name &&
1891 server->workstation_RFC1001_name[0] != 0)
1892 rfc1002mangle(ses_init_buf->trailer.
1893 session_req.calling_name,
1894 server->workstation_RFC1001_name,
1895 RFC1001_NAME_LEN_WITH_NULL);
1896 else
1897 rfc1002mangle(ses_init_buf->trailer.
1898 session_req.calling_name,
1899 "LINUX_CIFS_CLNT",
1900 RFC1001_NAME_LEN_WITH_NULL);
1901
1902 ses_init_buf->trailer.session_req.scope1 = 0;
1903 ses_init_buf->trailer.session_req.scope2 = 0;
1904 smb_buf = (struct smb_hdr *)ses_init_buf;
1905 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1906 smb_buf->smb_buf_length = 0x81000044;
1907 rc = smb_send(server, smb_buf, 0x44);
1908 kfree(ses_init_buf);
1909 msleep(1); /* RFC1001 layer in at least one server
1910 requires very short break before negprot
1911 presumably because not expecting negprot
1912 to follow so fast. This is a simple
1913 solution that works without
1914 complicating the code and causes no
1915 significant slowing down on mount
1916 for everyone else */
1917 }
1918 /* else the negprot may still work without this
1919 even though malloc failed */
1920
1921 }
1922
1923 return rc;
1924 }
1925
1926 static int
1927 ipv6_connect(struct TCP_Server_Info *server)
1928 {
1929 int rc = 0;
1930 int val;
1931 bool connected = false;
1932 __be16 orig_port = 0;
1933 struct socket *socket = server->ssocket;
1934
1935 if (socket == NULL) {
1936 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1937 IPPROTO_TCP, &socket);
1938 if (rc < 0) {
1939 cERROR(1, "Error %d creating ipv6 socket", rc);
1940 socket = NULL;
1941 return rc;
1942 }
1943
1944 /* BB other socket options to set KEEPALIVE, NODELAY? */
1945 cFYI(1, "ipv6 Socket created");
1946 server->ssocket = socket;
1947 socket->sk->sk_allocation = GFP_NOFS;
1948 cifs_reclassify_socket6(socket);
1949 }
1950
1951 /* user overrode default port */
1952 if (server->addr.sockAddr6.sin6_port) {
1953 rc = socket->ops->connect(socket,
1954 (struct sockaddr *) &server->addr.sockAddr6,
1955 sizeof(struct sockaddr_in6), 0);
1956 if (rc >= 0)
1957 connected = true;
1958 }
1959
1960 if (!connected) {
1961 /* save original port so we can retry user specified port
1962 later if fall back ports fail this time */
1963
1964 orig_port = server->addr.sockAddr6.sin6_port;
1965 /* do not retry on the same port we just failed on */
1966 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1967 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1968 rc = socket->ops->connect(socket, (struct sockaddr *)
1969 &server->addr.sockAddr6,
1970 sizeof(struct sockaddr_in6), 0);
1971 if (rc >= 0)
1972 connected = true;
1973 }
1974 }
1975 if (!connected) {
1976 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1977 rc = socket->ops->connect(socket, (struct sockaddr *)
1978 &server->addr.sockAddr6,
1979 sizeof(struct sockaddr_in6), 0);
1980 if (rc >= 0)
1981 connected = true;
1982 }
1983
1984 /* give up here - unless we want to retry on different
1985 protocol families some day */
1986 if (!connected) {
1987 if (orig_port)
1988 server->addr.sockAddr6.sin6_port = orig_port;
1989 cFYI(1, "Error %d connecting to server via ipv6", rc);
1990 sock_release(socket);
1991 server->ssocket = NULL;
1992 return rc;
1993 }
1994
1995 /*
1996 * Eventually check for other socket options to change from
1997 * the default. sock_setsockopt not used because it expects
1998 * user space buffer
1999 */
2000 socket->sk->sk_rcvtimeo = 7 * HZ;
2001 socket->sk->sk_sndtimeo = 5 * HZ;
2002
2003 if (server->tcp_nodelay) {
2004 val = 1;
2005 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2006 (char *)&val, sizeof(val));
2007 if (rc)
2008 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2009 }
2010
2011 server->ssocket = socket;
2012
2013 return rc;
2014 }
2015
2016 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2017 struct super_block *sb, struct smb_vol *vol_info)
2018 {
2019 /* if we are reconnecting then should we check to see if
2020 * any requested capabilities changed locally e.g. via
2021 * remount but we can not do much about it here
2022 * if they have (even if we could detect it by the following)
2023 * Perhaps we could add a backpointer to array of sb from tcon
2024 * or if we change to make all sb to same share the same
2025 * sb as NFS - then we only have one backpointer to sb.
2026 * What if we wanted to mount the server share twice once with
2027 * and once without posixacls or posix paths? */
2028 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2029
2030 if (vol_info && vol_info->no_linux_ext) {
2031 tcon->fsUnixInfo.Capability = 0;
2032 tcon->unix_ext = 0; /* Unix Extensions disabled */
2033 cFYI(1, "Linux protocol extensions disabled");
2034 return;
2035 } else if (vol_info)
2036 tcon->unix_ext = 1; /* Unix Extensions supported */
2037
2038 if (tcon->unix_ext == 0) {
2039 cFYI(1, "Unix extensions disabled so not set on reconnect");
2040 return;
2041 }
2042
2043 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2044 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2045
2046 /* check for reconnect case in which we do not
2047 want to change the mount behavior if we can avoid it */
2048 if (vol_info == NULL) {
2049 /* turn off POSIX ACL and PATHNAMES if not set
2050 originally at mount time */
2051 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2052 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2053 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2054 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2055 cERROR(1, "POSIXPATH support change");
2056 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2057 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2058 cERROR(1, "possible reconnect error");
2059 cERROR(1, "server disabled POSIX path support");
2060 }
2061 }
2062
2063 cap &= CIFS_UNIX_CAP_MASK;
2064 if (vol_info && vol_info->no_psx_acl)
2065 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2066 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2067 cFYI(1, "negotiated posix acl support");
2068 if (sb)
2069 sb->s_flags |= MS_POSIXACL;
2070 }
2071
2072 if (vol_info && vol_info->posix_paths == 0)
2073 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2074 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2075 cFYI(1, "negotiate posix pathnames");
2076 if (sb)
2077 CIFS_SB(sb)->mnt_cifs_flags |=
2078 CIFS_MOUNT_POSIX_PATHS;
2079 }
2080
2081 /* We might be setting the path sep back to a different
2082 form if we are reconnecting and the server switched its
2083 posix path capability for this share */
2084 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2085 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2086
2087 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2088 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2089 CIFS_SB(sb)->rsize = 127 * 1024;
2090 cFYI(DBG2, "larger reads not supported by srv");
2091 }
2092 }
2093
2094
2095 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2096 #ifdef CONFIG_CIFS_DEBUG2
2097 if (cap & CIFS_UNIX_FCNTL_CAP)
2098 cFYI(1, "FCNTL cap");
2099 if (cap & CIFS_UNIX_EXTATTR_CAP)
2100 cFYI(1, "EXTATTR cap");
2101 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2102 cFYI(1, "POSIX path cap");
2103 if (cap & CIFS_UNIX_XATTR_CAP)
2104 cFYI(1, "XATTR cap");
2105 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2106 cFYI(1, "POSIX ACL cap");
2107 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2108 cFYI(1, "very large read cap");
2109 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2110 cFYI(1, "very large write cap");
2111 #endif /* CIFS_DEBUG2 */
2112 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2113 if (vol_info == NULL) {
2114 cFYI(1, "resetting capabilities failed");
2115 } else
2116 cERROR(1, "Negotiating Unix capabilities "
2117 "with the server failed. Consider "
2118 "mounting with the Unix Extensions\n"
2119 "disabled, if problems are found, "
2120 "by specifying the nounix mount "
2121 "option.");
2122
2123 }
2124 }
2125 }
2126
2127 static void
2128 convert_delimiter(char *path, char delim)
2129 {
2130 int i;
2131 char old_delim;
2132
2133 if (path == NULL)
2134 return;
2135
2136 if (delim == '/')
2137 old_delim = '\\';
2138 else
2139 old_delim = '/';
2140
2141 for (i = 0; path[i] != '\0'; i++) {
2142 if (path[i] == old_delim)
2143 path[i] = delim;
2144 }
2145 }
2146
2147 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2148 struct cifs_sb_info *cifs_sb)
2149 {
2150 if (pvolume_info->rsize > CIFSMaxBufSize) {
2151 cERROR(1, "rsize %d too large, using MaxBufSize",
2152 pvolume_info->rsize);
2153 cifs_sb->rsize = CIFSMaxBufSize;
2154 } else if ((pvolume_info->rsize) &&
2155 (pvolume_info->rsize <= CIFSMaxBufSize))
2156 cifs_sb->rsize = pvolume_info->rsize;
2157 else /* default */
2158 cifs_sb->rsize = CIFSMaxBufSize;
2159
2160 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2161 cERROR(1, "wsize %d too large, using 4096 instead",
2162 pvolume_info->wsize);
2163 cifs_sb->wsize = 4096;
2164 } else if (pvolume_info->wsize)
2165 cifs_sb->wsize = pvolume_info->wsize;
2166 else
2167 cifs_sb->wsize = min_t(const int,
2168 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2169 127*1024);
2170 /* old default of CIFSMaxBufSize was too small now
2171 that SMB Write2 can send multiple pages in kvec.
2172 RFC1001 does not describe what happens when frame
2173 bigger than 128K is sent so use that as max in
2174 conjunction with 52K kvec constraint on arch with 4K
2175 page size */
2176
2177 if (cifs_sb->rsize < 2048) {
2178 cifs_sb->rsize = 2048;
2179 /* Windows ME may prefer this */
2180 cFYI(1, "readsize set to minimum: 2048");
2181 }
2182 /* calculate prepath */
2183 cifs_sb->prepath = pvolume_info->prepath;
2184 if (cifs_sb->prepath) {
2185 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2186 /* we can not convert the / to \ in the path
2187 separators in the prefixpath yet because we do not
2188 know (until reset_cifs_unix_caps is called later)
2189 whether POSIX PATH CAP is available. We normalize
2190 the / to \ after reset_cifs_unix_caps is called */
2191 pvolume_info->prepath = NULL;
2192 } else
2193 cifs_sb->prepathlen = 0;
2194 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2195 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2196 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2197 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2198 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2199 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2200
2201 if (pvolume_info->noperm)
2202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2203 if (pvolume_info->setuids)
2204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2205 if (pvolume_info->server_ino)
2206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2207 if (pvolume_info->remap)
2208 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2209 if (pvolume_info->no_xattr)
2210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2211 if (pvolume_info->sfu_emul)
2212 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2213 if (pvolume_info->nobrl)
2214 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2215 if (pvolume_info->nostrictsync)
2216 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2217 if (pvolume_info->mand_lock)
2218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2219 if (pvolume_info->cifs_acl)
2220 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2221 if (pvolume_info->override_uid)
2222 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2223 if (pvolume_info->override_gid)
2224 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2225 if (pvolume_info->dynperm)
2226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2227 if (pvolume_info->direct_io) {
2228 cFYI(1, "mounting share using direct i/o");
2229 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2230 }
2231
2232 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2233 cERROR(1, "mount option dynperm ignored if cifsacl "
2234 "mount option supported");
2235 }
2236
2237 static int
2238 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2239 struct cifs_sb_info *cifs_sb, const char *full_path)
2240 {
2241 int rc;
2242 FILE_ALL_INFO *pfile_info;
2243
2244 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2245 if (pfile_info == NULL)
2246 return -ENOMEM;
2247
2248 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2249 0 /* not legacy */, cifs_sb->local_nls,
2250 cifs_sb->mnt_cifs_flags &
2251 CIFS_MOUNT_MAP_SPECIAL_CHR);
2252 kfree(pfile_info);
2253 return rc;
2254 }
2255
2256 static void
2257 cleanup_volume_info(struct smb_vol **pvolume_info)
2258 {
2259 struct smb_vol *volume_info;
2260
2261 if (!pvolume_info && !*pvolume_info)
2262 return;
2263
2264 volume_info = *pvolume_info;
2265 kzfree(volume_info->password);
2266 kfree(volume_info->UNC);
2267 kfree(volume_info->prepath);
2268 kfree(volume_info);
2269 *pvolume_info = NULL;
2270 return;
2271 }
2272
2273 #ifdef CONFIG_CIFS_DFS_UPCALL
2274 /* build_path_to_root returns full path to root when
2275 * we do not have an exiting connection (tcon) */
2276 static char *
2277 build_unc_path_to_root(const struct smb_vol *volume_info,
2278 const struct cifs_sb_info *cifs_sb)
2279 {
2280 char *full_path;
2281
2282 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2283 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2284 if (full_path == NULL)
2285 return ERR_PTR(-ENOMEM);
2286
2287 strncpy(full_path, volume_info->UNC, unc_len);
2288 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2289 int i;
2290 for (i = 0; i < unc_len; i++) {
2291 if (full_path[i] == '\\')
2292 full_path[i] = '/';
2293 }
2294 }
2295
2296 if (cifs_sb->prepathlen)
2297 strncpy(full_path + unc_len, cifs_sb->prepath,
2298 cifs_sb->prepathlen);
2299
2300 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2301 return full_path;
2302 }
2303 #endif
2304
2305 int
2306 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2307 char *mount_data_global, const char *devname)
2308 {
2309 int rc;
2310 int xid;
2311 struct smb_vol *volume_info;
2312 struct cifsSesInfo *pSesInfo;
2313 struct cifsTconInfo *tcon;
2314 struct TCP_Server_Info *srvTcp;
2315 char *full_path;
2316 char *mount_data = mount_data_global;
2317 #ifdef CONFIG_CIFS_DFS_UPCALL
2318 struct dfs_info3_param *referrals = NULL;
2319 unsigned int num_referrals = 0;
2320 int referral_walks_count = 0;
2321 try_mount_again:
2322 #endif
2323 rc = 0;
2324 tcon = NULL;
2325 pSesInfo = NULL;
2326 srvTcp = NULL;
2327 full_path = NULL;
2328
2329 xid = GetXid();
2330
2331 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2332 if (!volume_info) {
2333 rc = -ENOMEM;
2334 goto out;
2335 }
2336
2337 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2338 rc = -EINVAL;
2339 goto out;
2340 }
2341
2342 if (volume_info->nullauth) {
2343 cFYI(1, "null user");
2344 volume_info->username = "";
2345 } else if (volume_info->username) {
2346 /* BB fixme parse for domain name here */
2347 cFYI(1, "Username: %s", volume_info->username);
2348 } else {
2349 cifserror("No username specified");
2350 /* In userspace mount helper we can get user name from alternate
2351 locations such as env variables and files on disk */
2352 rc = -EINVAL;
2353 goto out;
2354 }
2355
2356
2357 /* this is needed for ASCII cp to Unicode converts */
2358 if (volume_info->iocharset == NULL) {
2359 cifs_sb->local_nls = load_nls_default();
2360 /* load_nls_default can not return null */
2361 } else {
2362 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2363 if (cifs_sb->local_nls == NULL) {
2364 cERROR(1, "CIFS mount error: iocharset %s not found",
2365 volume_info->iocharset);
2366 rc = -ELIBACC;
2367 goto out;
2368 }
2369 }
2370
2371 /* get a reference to a tcp session */
2372 srvTcp = cifs_get_tcp_session(volume_info);
2373 if (IS_ERR(srvTcp)) {
2374 rc = PTR_ERR(srvTcp);
2375 goto out;
2376 }
2377
2378 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2379 if (pSesInfo) {
2380 cFYI(1, "Existing smb sess found (status=%d)",
2381 pSesInfo->status);
2382 /*
2383 * The existing SMB session already has a reference to srvTcp,
2384 * so we can put back the extra one we got before
2385 */
2386 cifs_put_tcp_session(srvTcp);
2387
2388 mutex_lock(&pSesInfo->session_mutex);
2389 if (pSesInfo->need_reconnect) {
2390 cFYI(1, "Session needs reconnect");
2391 rc = cifs_setup_session(xid, pSesInfo,
2392 cifs_sb->local_nls);
2393 }
2394 mutex_unlock(&pSesInfo->session_mutex);
2395 } else if (!rc) {
2396 cFYI(1, "Existing smb sess not found");
2397 pSesInfo = sesInfoAlloc();
2398 if (pSesInfo == NULL) {
2399 rc = -ENOMEM;
2400 goto mount_fail_check;
2401 }
2402
2403 /* new SMB session uses our srvTcp ref */
2404 pSesInfo->server = srvTcp;
2405 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2406 sprintf(pSesInfo->serverName, "%pI6",
2407 &srvTcp->addr.sockAddr6.sin6_addr);
2408 else
2409 sprintf(pSesInfo->serverName, "%pI4",
2410 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2411
2412 write_lock(&cifs_tcp_ses_lock);
2413 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2414 write_unlock(&cifs_tcp_ses_lock);
2415
2416 /* volume_info->password freed at unmount */
2417 if (volume_info->password) {
2418 pSesInfo->password = kstrdup(volume_info->password,
2419 GFP_KERNEL);
2420 if (!pSesInfo->password) {
2421 rc = -ENOMEM;
2422 goto mount_fail_check;
2423 }
2424 }
2425 if (volume_info->username)
2426 strncpy(pSesInfo->userName, volume_info->username,
2427 MAX_USERNAME_SIZE);
2428 if (volume_info->domainname) {
2429 int len = strlen(volume_info->domainname);
2430 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2431 if (pSesInfo->domainName)
2432 strcpy(pSesInfo->domainName,
2433 volume_info->domainname);
2434 }
2435 pSesInfo->linux_uid = volume_info->linux_uid;
2436 pSesInfo->overrideSecFlg = volume_info->secFlg;
2437 mutex_lock(&pSesInfo->session_mutex);
2438
2439 /* BB FIXME need to pass vol->secFlgs BB */
2440 rc = cifs_setup_session(xid, pSesInfo,
2441 cifs_sb->local_nls);
2442 mutex_unlock(&pSesInfo->session_mutex);
2443 }
2444
2445 /* search for existing tcon to this server share */
2446 if (!rc) {
2447 setup_cifs_sb(volume_info, cifs_sb);
2448
2449 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2450 if (tcon) {
2451 cFYI(1, "Found match on UNC path");
2452 /* existing tcon already has a reference */
2453 cifs_put_smb_ses(pSesInfo);
2454 if (tcon->seal != volume_info->seal)
2455 cERROR(1, "transport encryption setting "
2456 "conflicts with existing tid");
2457 } else {
2458 tcon = tconInfoAlloc();
2459 if (tcon == NULL) {
2460 rc = -ENOMEM;
2461 goto mount_fail_check;
2462 }
2463
2464 tcon->ses = pSesInfo;
2465 if (volume_info->password) {
2466 tcon->password = kstrdup(volume_info->password,
2467 GFP_KERNEL);
2468 if (!tcon->password) {
2469 rc = -ENOMEM;
2470 goto mount_fail_check;
2471 }
2472 }
2473
2474 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2475 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2476 cERROR(1, "Missing share name");
2477 rc = -ENODEV;
2478 goto mount_fail_check;
2479 } else {
2480 /* BB Do we need to wrap sesSem around
2481 * this TCon call and Unix SetFS as
2482 * we do on SessSetup and reconnect? */
2483 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2484 tcon, cifs_sb->local_nls);
2485 cFYI(1, "CIFS Tcon rc = %d", rc);
2486 if (volume_info->nodfs) {
2487 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2488 cFYI(1, "DFS disabled (%d)",
2489 tcon->Flags);
2490 }
2491 }
2492 if (rc)
2493 goto remote_path_check;
2494 tcon->seal = volume_info->seal;
2495 write_lock(&cifs_tcp_ses_lock);
2496 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2497 write_unlock(&cifs_tcp_ses_lock);
2498 }
2499
2500 /* we can have only one retry value for a connection
2501 to a share so for resources mounted more than once
2502 to the same server share the last value passed in
2503 for the retry flag is used */
2504 tcon->retry = volume_info->retry;
2505 tcon->nocase = volume_info->nocase;
2506 tcon->local_lease = volume_info->local_lease;
2507 }
2508 if (pSesInfo) {
2509 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2510 sb->s_maxbytes = MAX_LFS_FILESIZE;
2511 else
2512 sb->s_maxbytes = MAX_NON_LFS;
2513 }
2514
2515 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2516 sb->s_time_gran = 100;
2517
2518 if (rc)
2519 goto remote_path_check;
2520
2521 cifs_sb->tcon = tcon;
2522
2523 /* do not care if following two calls succeed - informational */
2524 if (!tcon->ipc) {
2525 CIFSSMBQFSDeviceInfo(xid, tcon);
2526 CIFSSMBQFSAttributeInfo(xid, tcon);
2527 }
2528
2529 /* tell server which Unix caps we support */
2530 if (tcon->ses->capabilities & CAP_UNIX)
2531 /* reset of caps checks mount to see if unix extensions
2532 disabled for just this mount */
2533 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2534 else
2535 tcon->unix_ext = 0; /* server does not support them */
2536
2537 /* convert forward to back slashes in prepath here if needed */
2538 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2539 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2540
2541 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2542 cifs_sb->rsize = 1024 * 127;
2543 cFYI(DBG2, "no very large read support, rsize now 127K");
2544 }
2545 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2546 cifs_sb->wsize = min(cifs_sb->wsize,
2547 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2548 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2549 cifs_sb->rsize = min(cifs_sb->rsize,
2550 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2551
2552 remote_path_check:
2553 /* check if a whole path (including prepath) is not remote */
2554 if (!rc && cifs_sb->prepathlen && tcon) {
2555 /* build_path_to_root works only when we have a valid tcon */
2556 full_path = cifs_build_path_to_root(cifs_sb);
2557 if (full_path == NULL) {
2558 rc = -ENOMEM;
2559 goto mount_fail_check;
2560 }
2561 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2562 if (rc != -EREMOTE) {
2563 kfree(full_path);
2564 goto mount_fail_check;
2565 }
2566 kfree(full_path);
2567 }
2568
2569 /* get referral if needed */
2570 if (rc == -EREMOTE) {
2571 #ifdef CONFIG_CIFS_DFS_UPCALL
2572 if (referral_walks_count > MAX_NESTED_LINKS) {
2573 /*
2574 * BB: when we implement proper loop detection,
2575 * we will remove this check. But now we need it
2576 * to prevent an indefinite loop if 'DFS tree' is
2577 * misconfigured (i.e. has loops).
2578 */
2579 rc = -ELOOP;
2580 goto mount_fail_check;
2581 }
2582 /* convert forward to back slashes in prepath here if needed */
2583 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2584 convert_delimiter(cifs_sb->prepath,
2585 CIFS_DIR_SEP(cifs_sb));
2586 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2587 if (IS_ERR(full_path)) {
2588 rc = PTR_ERR(full_path);
2589 goto mount_fail_check;
2590 }
2591
2592 cFYI(1, "Getting referral for: %s", full_path);
2593 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2594 cifs_sb->local_nls, &num_referrals, &referrals,
2595 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2596 if (!rc && num_referrals > 0) {
2597 char *fake_devname = NULL;
2598
2599 if (mount_data != mount_data_global)
2600 kfree(mount_data);
2601
2602 mount_data = cifs_compose_mount_options(
2603 cifs_sb->mountdata, full_path + 1,
2604 referrals, &fake_devname);
2605
2606 free_dfs_info_array(referrals, num_referrals);
2607 kfree(fake_devname);
2608 kfree(full_path);
2609
2610 if (IS_ERR(mount_data)) {
2611 rc = PTR_ERR(mount_data);
2612 mount_data = NULL;
2613 goto mount_fail_check;
2614 }
2615
2616 if (tcon)
2617 cifs_put_tcon(tcon);
2618 else if (pSesInfo)
2619 cifs_put_smb_ses(pSesInfo);
2620
2621 cleanup_volume_info(&volume_info);
2622 referral_walks_count++;
2623 FreeXid(xid);
2624 goto try_mount_again;
2625 }
2626 #else /* No DFS support, return error on mount */
2627 rc = -EOPNOTSUPP;
2628 #endif
2629 }
2630
2631 mount_fail_check:
2632 /* on error free sesinfo and tcon struct if needed */
2633 if (rc) {
2634 if (mount_data != mount_data_global)
2635 kfree(mount_data);
2636 /* If find_unc succeeded then rc == 0 so we can not end */
2637 /* up accidently freeing someone elses tcon struct */
2638 if (tcon)
2639 cifs_put_tcon(tcon);
2640 else if (pSesInfo)
2641 cifs_put_smb_ses(pSesInfo);
2642 else
2643 cifs_put_tcp_session(srvTcp);
2644 goto out;
2645 }
2646
2647 /* volume_info->password is freed above when existing session found
2648 (in which case it is not needed anymore) but when new sesion is created
2649 the password ptr is put in the new session structure (in which case the
2650 password will be freed at unmount time) */
2651 out:
2652 /* zero out password before freeing */
2653 cleanup_volume_info(&volume_info);
2654 FreeXid(xid);
2655 return rc;
2656 }
2657
2658 int
2659 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2660 const char *tree, struct cifsTconInfo *tcon,
2661 const struct nls_table *nls_codepage)
2662 {
2663 struct smb_hdr *smb_buffer;
2664 struct smb_hdr *smb_buffer_response;
2665 TCONX_REQ *pSMB;
2666 TCONX_RSP *pSMBr;
2667 unsigned char *bcc_ptr;
2668 int rc = 0;
2669 int length, bytes_left;
2670 __u16 count;
2671
2672 if (ses == NULL)
2673 return -EIO;
2674
2675 smb_buffer = cifs_buf_get();
2676 if (smb_buffer == NULL)
2677 return -ENOMEM;
2678
2679 smb_buffer_response = smb_buffer;
2680
2681 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2682 NULL /*no tid */ , 4 /*wct */ );
2683
2684 smb_buffer->Mid = GetNextMid(ses->server);
2685 smb_buffer->Uid = ses->Suid;
2686 pSMB = (TCONX_REQ *) smb_buffer;
2687 pSMBr = (TCONX_RSP *) smb_buffer_response;
2688
2689 pSMB->AndXCommand = 0xFF;
2690 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2691 bcc_ptr = &pSMB->Password[0];
2692 if ((ses->server->secMode) & SECMODE_USER) {
2693 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2694 *bcc_ptr = 0; /* password is null byte */
2695 bcc_ptr++; /* skip password */
2696 /* already aligned so no need to do it below */
2697 } else {
2698 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2699 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2700 specified as required (when that support is added to
2701 the vfs in the future) as only NTLM or the much
2702 weaker LANMAN (which we do not send by default) is accepted
2703 by Samba (not sure whether other servers allow
2704 NTLMv2 password here) */
2705 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2706 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2707 (ses->server->secType == LANMAN))
2708 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2709 ses->server->secMode &
2710 SECMODE_PW_ENCRYPT ? true : false,
2711 bcc_ptr);
2712 else
2713 #endif /* CIFS_WEAK_PW_HASH */
2714 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2715 bcc_ptr);
2716
2717 bcc_ptr += CIFS_SESS_KEY_SIZE;
2718 if (ses->capabilities & CAP_UNICODE) {
2719 /* must align unicode strings */
2720 *bcc_ptr = 0; /* null byte password */
2721 bcc_ptr++;
2722 }
2723 }
2724
2725 if (ses->server->secMode &
2726 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2727 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2728
2729 if (ses->capabilities & CAP_STATUS32) {
2730 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2731 }
2732 if (ses->capabilities & CAP_DFS) {
2733 smb_buffer->Flags2 |= SMBFLG2_DFS;
2734 }
2735 if (ses->capabilities & CAP_UNICODE) {
2736 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2737 length =
2738 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2739 6 /* max utf8 char length in bytes */ *
2740 (/* server len*/ + 256 /* share len */), nls_codepage);
2741 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2742 bcc_ptr += 2; /* skip trailing null */
2743 } else { /* ASCII */
2744 strcpy(bcc_ptr, tree);
2745 bcc_ptr += strlen(tree) + 1;
2746 }
2747 strcpy(bcc_ptr, "?????");
2748 bcc_ptr += strlen("?????");
2749 bcc_ptr += 1;
2750 count = bcc_ptr - &pSMB->Password[0];
2751 pSMB->hdr.smb_buf_length += count;
2752 pSMB->ByteCount = cpu_to_le16(count);
2753
2754 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2755 CIFS_STD_OP);
2756
2757 /* above now done in SendReceive */
2758 if ((rc == 0) && (tcon != NULL)) {
2759 bool is_unicode;
2760
2761 tcon->tidStatus = CifsGood;
2762 tcon->need_reconnect = false;
2763 tcon->tid = smb_buffer_response->Tid;
2764 bcc_ptr = pByteArea(smb_buffer_response);
2765 bytes_left = BCC(smb_buffer_response);
2766 length = strnlen(bcc_ptr, bytes_left - 2);
2767 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2768 is_unicode = true;
2769 else
2770 is_unicode = false;
2771
2772
2773 /* skip service field (NB: this field is always ASCII) */
2774 if (length == 3) {
2775 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2776 (bcc_ptr[2] == 'C')) {
2777 cFYI(1, "IPC connection");
2778 tcon->ipc = 1;
2779 }
2780 } else if (length == 2) {
2781 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2782 /* the most common case */
2783 cFYI(1, "disk share connection");
2784 }
2785 }
2786 bcc_ptr += length + 1;
2787 bytes_left -= (length + 1);
2788 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2789
2790 /* mostly informational -- no need to fail on error here */
2791 kfree(tcon->nativeFileSystem);
2792 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2793 bytes_left, is_unicode,
2794 nls_codepage);
2795
2796 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2797
2798 if ((smb_buffer_response->WordCount == 3) ||
2799 (smb_buffer_response->WordCount == 7))
2800 /* field is in same location */
2801 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2802 else
2803 tcon->Flags = 0;
2804 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2805 } else if ((rc == 0) && tcon == NULL) {
2806 /* all we need to save for IPC$ connection */
2807 ses->ipc_tid = smb_buffer_response->Tid;
2808 }
2809
2810 cifs_buf_release(smb_buffer);
2811 return rc;
2812 }
2813
2814 int
2815 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2816 {
2817 int rc = 0;
2818 char *tmp;
2819
2820 if (cifs_sb->tcon)
2821 cifs_put_tcon(cifs_sb->tcon);
2822
2823 cifs_sb->tcon = NULL;
2824 tmp = cifs_sb->prepath;
2825 cifs_sb->prepathlen = 0;
2826 cifs_sb->prepath = NULL;
2827 kfree(tmp);
2828
2829 return rc;
2830 }
2831
2832 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2833 struct nls_table *nls_info)
2834 {
2835 int rc = 0;
2836 int first_time = 0;
2837 struct TCP_Server_Info *server = pSesInfo->server;
2838
2839 /* what if server changes its buffer size after dropping the session? */
2840 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2841 rc = CIFSSMBNegotiate(xid, pSesInfo);
2842 if (rc == -EAGAIN) {
2843 /* retry only once on 1st time connection */
2844 rc = CIFSSMBNegotiate(xid, pSesInfo);
2845 if (rc == -EAGAIN)
2846 rc = -EHOSTDOWN;
2847 }
2848 if (rc == 0) {
2849 spin_lock(&GlobalMid_Lock);
2850 if (server->tcpStatus != CifsExiting)
2851 server->tcpStatus = CifsGood;
2852 else
2853 rc = -EHOSTDOWN;
2854 spin_unlock(&GlobalMid_Lock);
2855
2856 }
2857 first_time = 1;
2858 }
2859
2860 if (rc)
2861 goto ss_err_exit;
2862
2863 pSesInfo->flags = 0;
2864 pSesInfo->capabilities = server->capabilities;
2865 if (linuxExtEnabled == 0)
2866 pSesInfo->capabilities &= (~CAP_UNIX);
2867
2868 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2869 server->secMode, server->capabilities, server->timeAdj);
2870
2871 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2872 if (rc) {
2873 cERROR(1, "Send error in SessSetup = %d", rc);
2874 } else {
2875 cFYI(1, "CIFS Session Established successfully");
2876 spin_lock(&GlobalMid_Lock);
2877 pSesInfo->status = CifsGood;
2878 pSesInfo->need_reconnect = false;
2879 spin_unlock(&GlobalMid_Lock);
2880 }
2881
2882 ss_err_exit:
2883 return rc;
2884 }
2885
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree