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cifs: have cifs parse scope_id out of IPv6 addresses and use it
[deliverable/linux.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/pagemap.h>
27 #include <linux/ctype.h>
28 #include <linux/utsname.h>
29 #include <linux/mempool.h>
30 #include <linux/delay.h>
31 #include <linux/completion.h>
32 #include <linux/kthread.h>
33 #include <linux/pagevec.h>
34 #include <linux/freezer.h>
35 #include <linux/namei.h>
36 #include <asm/uaccess.h>
37 #include <asm/processor.h>
38 #include <linux/inet.h>
39 #include <net/ipv6.h>
40 #include "cifspdu.h"
41 #include "cifsglob.h"
42 #include "cifsproto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include "ntlmssp.h"
47 #include "nterr.h"
48 #include "rfc1002pdu.h"
49 #include "cn_cifs.h"
50
51 #define CIFS_PORT 445
52 #define RFC1001_PORT 139
53
54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
55 unsigned char *p24);
56
57 extern mempool_t *cifs_req_poolp;
58
59 struct smb_vol {
60 char *username;
61 char *password;
62 char *domainname;
63 char *UNC;
64 char *UNCip;
65 char *iocharset; /* local code page for mapping to and from Unicode */
66 char source_rfc1001_name[16]; /* netbios name of client */
67 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
68 uid_t linux_uid;
69 gid_t linux_gid;
70 mode_t file_mode;
71 mode_t dir_mode;
72 unsigned secFlg;
73 bool rw:1;
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 unsigned int sockopt;
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
808 separator[0] = ',';
809 separator[1] = 0;
810
811 if (Local_System_Name[0] != 0)
812 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
813 else {
814 char *nodename = utsname()->nodename;
815 int n = strnlen(nodename, 15);
816 memset(vol->source_rfc1001_name, 0x20, 15);
817 for (i = 0; i < n; i++) {
818 /* does not have to be perfect mapping since field is
819 informational, only used for servers that do not support
820 port 445 and it can be overridden at mount time */
821 vol->source_rfc1001_name[i] = toupper(nodename[i]);
822 }
823 }
824 vol->source_rfc1001_name[15] = 0;
825 /* null target name indicates to use *SMBSERVR default called name
826 if we end up sending RFC1001 session initialize */
827 vol->target_rfc1001_name[0] = 0;
828 vol->linux_uid = current_uid(); /* use current_euid() instead? */
829 vol->linux_gid = current_gid();
830
831 /* default to only allowing write access to owner of the mount */
832 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
833
834 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
835 vol->rw = true;
836 /* default is always to request posix paths. */
837 vol->posix_paths = 1;
838 /* default to using server inode numbers where available */
839 vol->server_ino = 1;
840
841 if (!options)
842 return 1;
843
844 if (strncmp(options, "sep=", 4) == 0) {
845 if (options[4] != 0) {
846 separator[0] = options[4];
847 options += 5;
848 } else {
849 cFYI(1, ("Null separator not allowed"));
850 }
851 }
852
853 while ((data = strsep(&options, separator)) != NULL) {
854 if (!*data)
855 continue;
856 if ((value = strchr(data, '=')) != NULL)
857 *value++ = '\0';
858
859 /* Have to parse this before we parse for "user" */
860 if (strnicmp(data, "user_xattr", 10) == 0) {
861 vol->no_xattr = 0;
862 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
863 vol->no_xattr = 1;
864 } else if (strnicmp(data, "user", 4) == 0) {
865 if (!value) {
866 printk(KERN_WARNING
867 "CIFS: invalid or missing username\n");
868 return 1; /* needs_arg; */
869 } else if (!*value) {
870 /* null user, ie anonymous, authentication */
871 vol->nullauth = 1;
872 }
873 if (strnlen(value, 200) < 200) {
874 vol->username = value;
875 } else {
876 printk(KERN_WARNING "CIFS: username too long\n");
877 return 1;
878 }
879 } else if (strnicmp(data, "pass", 4) == 0) {
880 if (!value) {
881 vol->password = NULL;
882 continue;
883 } else if (value[0] == 0) {
884 /* check if string begins with double comma
885 since that would mean the password really
886 does start with a comma, and would not
887 indicate an empty string */
888 if (value[1] != separator[0]) {
889 vol->password = NULL;
890 continue;
891 }
892 }
893 temp_len = strlen(value);
894 /* removed password length check, NTLM passwords
895 can be arbitrarily long */
896
897 /* if comma in password, the string will be
898 prematurely null terminated. Commas in password are
899 specified across the cifs mount interface by a double
900 comma ie ,, and a comma used as in other cases ie ','
901 as a parameter delimiter/separator is single and due
902 to the strsep above is temporarily zeroed. */
903
904 /* NB: password legally can have multiple commas and
905 the only illegal character in a password is null */
906
907 if ((value[temp_len] == 0) &&
908 (value[temp_len+1] == separator[0])) {
909 /* reinsert comma */
910 value[temp_len] = separator[0];
911 temp_len += 2; /* move after second comma */
912 while (value[temp_len] != 0) {
913 if (value[temp_len] == separator[0]) {
914 if (value[temp_len+1] ==
915 separator[0]) {
916 /* skip second comma */
917 temp_len++;
918 } else {
919 /* single comma indicating start
920 of next parm */
921 break;
922 }
923 }
924 temp_len++;
925 }
926 if (value[temp_len] == 0) {
927 options = NULL;
928 } else {
929 value[temp_len] = 0;
930 /* point option to start of next parm */
931 options = value + temp_len + 1;
932 }
933 /* go from value to value + temp_len condensing
934 double commas to singles. Note that this ends up
935 allocating a few bytes too many, which is ok */
936 vol->password = kzalloc(temp_len, GFP_KERNEL);
937 if (vol->password == NULL) {
938 printk(KERN_WARNING "CIFS: no memory "
939 "for password\n");
940 return 1;
941 }
942 for (i = 0, j = 0; i < temp_len; i++, j++) {
943 vol->password[j] = value[i];
944 if (value[i] == separator[0]
945 && value[i+1] == separator[0]) {
946 /* skip second comma */
947 i++;
948 }
949 }
950 vol->password[j] = 0;
951 } else {
952 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
953 if (vol->password == NULL) {
954 printk(KERN_WARNING "CIFS: no memory "
955 "for password\n");
956 return 1;
957 }
958 strcpy(vol->password, value);
959 }
960 } else if (!strnicmp(data, "ip", 2) ||
961 !strnicmp(data, "addr", 4)) {
962 if (!value || !*value) {
963 vol->UNCip = NULL;
964 } else if (strnlen(value, INET6_ADDRSTRLEN) <
965 INET6_ADDRSTRLEN) {
966 vol->UNCip = value;
967 } else {
968 printk(KERN_WARNING "CIFS: ip address "
969 "too long\n");
970 return 1;
971 }
972 } else if (strnicmp(data, "sec", 3) == 0) {
973 if (!value || !*value) {
974 cERROR(1, ("no security value specified"));
975 continue;
976 } else if (strnicmp(value, "krb5i", 5) == 0) {
977 vol->secFlg |= CIFSSEC_MAY_KRB5 |
978 CIFSSEC_MUST_SIGN;
979 } else if (strnicmp(value, "krb5p", 5) == 0) {
980 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
981 CIFSSEC_MAY_KRB5; */
982 cERROR(1, ("Krb5 cifs privacy not supported"));
983 return 1;
984 } else if (strnicmp(value, "krb5", 4) == 0) {
985 vol->secFlg |= CIFSSEC_MAY_KRB5;
986 #ifdef CONFIG_CIFS_EXPERIMENTAL
987 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
988 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
989 CIFSSEC_MUST_SIGN;
990 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
991 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
992 #endif
993 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
994 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
995 CIFSSEC_MUST_SIGN;
996 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
997 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
998 } else if (strnicmp(value, "ntlmi", 5) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLM |
1000 CIFSSEC_MUST_SIGN;
1001 } else if (strnicmp(value, "ntlm", 4) == 0) {
1002 /* ntlm is default so can be turned off too */
1003 vol->secFlg |= CIFSSEC_MAY_NTLM;
1004 } else if (strnicmp(value, "nontlm", 6) == 0) {
1005 /* BB is there a better way to do this? */
1006 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1007 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1008 } else if (strnicmp(value, "lanman", 6) == 0) {
1009 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1010 #endif
1011 } else if (strnicmp(value, "none", 4) == 0) {
1012 vol->nullauth = 1;
1013 } else {
1014 cERROR(1, ("bad security option: %s", value));
1015 return 1;
1016 }
1017 } else if ((strnicmp(data, "unc", 3) == 0)
1018 || (strnicmp(data, "target", 6) == 0)
1019 || (strnicmp(data, "path", 4) == 0)) {
1020 if (!value || !*value) {
1021 printk(KERN_WARNING "CIFS: invalid path to "
1022 "network resource\n");
1023 return 1; /* needs_arg; */
1024 }
1025 if ((temp_len = strnlen(value, 300)) < 300) {
1026 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1027 if (vol->UNC == NULL)
1028 return 1;
1029 strcpy(vol->UNC, value);
1030 if (strncmp(vol->UNC, "//", 2) == 0) {
1031 vol->UNC[0] = '\\';
1032 vol->UNC[1] = '\\';
1033 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1034 printk(KERN_WARNING
1035 "CIFS: UNC Path does not begin "
1036 "with // or \\\\ \n");
1037 return 1;
1038 }
1039 } else {
1040 printk(KERN_WARNING "CIFS: UNC name too long\n");
1041 return 1;
1042 }
1043 } else if ((strnicmp(data, "domain", 3) == 0)
1044 || (strnicmp(data, "workgroup", 5) == 0)) {
1045 if (!value || !*value) {
1046 printk(KERN_WARNING "CIFS: invalid domain name\n");
1047 return 1; /* needs_arg; */
1048 }
1049 /* BB are there cases in which a comma can be valid in
1050 a domain name and need special handling? */
1051 if (strnlen(value, 256) < 256) {
1052 vol->domainname = value;
1053 cFYI(1, ("Domain name set"));
1054 } else {
1055 printk(KERN_WARNING "CIFS: domain name too "
1056 "long\n");
1057 return 1;
1058 }
1059 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1060 if (!value || !*value) {
1061 printk(KERN_WARNING
1062 "CIFS: invalid path prefix\n");
1063 return 1; /* needs_argument */
1064 }
1065 if ((temp_len = strnlen(value, 1024)) < 1024) {
1066 if (value[0] != '/')
1067 temp_len++; /* missing leading slash */
1068 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1069 if (vol->prepath == NULL)
1070 return 1;
1071 if (value[0] != '/') {
1072 vol->prepath[0] = '/';
1073 strcpy(vol->prepath+1, value);
1074 } else
1075 strcpy(vol->prepath, value);
1076 cFYI(1, ("prefix path %s", vol->prepath));
1077 } else {
1078 printk(KERN_WARNING "CIFS: prefix too long\n");
1079 return 1;
1080 }
1081 } else if (strnicmp(data, "iocharset", 9) == 0) {
1082 if (!value || !*value) {
1083 printk(KERN_WARNING "CIFS: invalid iocharset "
1084 "specified\n");
1085 return 1; /* needs_arg; */
1086 }
1087 if (strnlen(value, 65) < 65) {
1088 if (strnicmp(value, "default", 7))
1089 vol->iocharset = value;
1090 /* if iocharset not set then load_nls_default
1091 is used by caller */
1092 cFYI(1, ("iocharset set to %s", value));
1093 } else {
1094 printk(KERN_WARNING "CIFS: iocharset name "
1095 "too long.\n");
1096 return 1;
1097 }
1098 } else if (strnicmp(data, "uid", 3) == 0) {
1099 if (value && *value)
1100 vol->linux_uid =
1101 simple_strtoul(value, &value, 0);
1102 } else if (strnicmp(data, "forceuid", 8) == 0) {
1103 vol->override_uid = 1;
1104 } else if (strnicmp(data, "gid", 3) == 0) {
1105 if (value && *value)
1106 vol->linux_gid =
1107 simple_strtoul(value, &value, 0);
1108 } else if (strnicmp(data, "forcegid", 8) == 0) {
1109 vol->override_gid = 1;
1110 } else if (strnicmp(data, "file_mode", 4) == 0) {
1111 if (value && *value) {
1112 vol->file_mode =
1113 simple_strtoul(value, &value, 0);
1114 }
1115 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1116 if (value && *value) {
1117 vol->dir_mode =
1118 simple_strtoul(value, &value, 0);
1119 }
1120 } else if (strnicmp(data, "dirmode", 4) == 0) {
1121 if (value && *value) {
1122 vol->dir_mode =
1123 simple_strtoul(value, &value, 0);
1124 }
1125 } else if (strnicmp(data, "port", 4) == 0) {
1126 if (value && *value) {
1127 vol->port =
1128 simple_strtoul(value, &value, 0);
1129 }
1130 } else if (strnicmp(data, "rsize", 5) == 0) {
1131 if (value && *value) {
1132 vol->rsize =
1133 simple_strtoul(value, &value, 0);
1134 }
1135 } else if (strnicmp(data, "wsize", 5) == 0) {
1136 if (value && *value) {
1137 vol->wsize =
1138 simple_strtoul(value, &value, 0);
1139 }
1140 } else if (strnicmp(data, "sockopt", 5) == 0) {
1141 if (value && *value) {
1142 vol->sockopt =
1143 simple_strtoul(value, &value, 0);
1144 }
1145 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1146 if (!value || !*value || (*value == ' ')) {
1147 cFYI(1, ("invalid (empty) netbiosname"));
1148 } else {
1149 memset(vol->source_rfc1001_name, 0x20, 15);
1150 for (i = 0; i < 15; i++) {
1151 /* BB are there cases in which a comma can be
1152 valid in this workstation netbios name (and need
1153 special handling)? */
1154
1155 /* We do not uppercase netbiosname for user */
1156 if (value[i] == 0)
1157 break;
1158 else
1159 vol->source_rfc1001_name[i] =
1160 value[i];
1161 }
1162 /* The string has 16th byte zero still from
1163 set at top of the function */
1164 if ((i == 15) && (value[i] != 0))
1165 printk(KERN_WARNING "CIFS: netbiosname"
1166 " longer than 15 truncated.\n");
1167 }
1168 } else if (strnicmp(data, "servern", 7) == 0) {
1169 /* servernetbiosname specified override *SMBSERVER */
1170 if (!value || !*value || (*value == ' ')) {
1171 cFYI(1, ("empty server netbiosname specified"));
1172 } else {
1173 /* last byte, type, is 0x20 for servr type */
1174 memset(vol->target_rfc1001_name, 0x20, 16);
1175
1176 for (i = 0; i < 15; i++) {
1177 /* BB are there cases in which a comma can be
1178 valid in this workstation netbios name
1179 (and need special handling)? */
1180
1181 /* user or mount helper must uppercase
1182 the netbiosname */
1183 if (value[i] == 0)
1184 break;
1185 else
1186 vol->target_rfc1001_name[i] =
1187 value[i];
1188 }
1189 /* The string has 16th byte zero still from
1190 set at top of the function */
1191 if ((i == 15) && (value[i] != 0))
1192 printk(KERN_WARNING "CIFS: server net"
1193 "biosname longer than 15 truncated.\n");
1194 }
1195 } else if (strnicmp(data, "credentials", 4) == 0) {
1196 /* ignore */
1197 } else if (strnicmp(data, "version", 3) == 0) {
1198 /* ignore */
1199 } else if (strnicmp(data, "guest", 5) == 0) {
1200 /* ignore */
1201 } else if (strnicmp(data, "rw", 2) == 0) {
1202 vol->rw = true;
1203 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1204 vol->noblocksnd = 1;
1205 } else if (strnicmp(data, "noautotune", 10) == 0) {
1206 vol->noautotune = 1;
1207 } else if ((strnicmp(data, "suid", 4) == 0) ||
1208 (strnicmp(data, "nosuid", 6) == 0) ||
1209 (strnicmp(data, "exec", 4) == 0) ||
1210 (strnicmp(data, "noexec", 6) == 0) ||
1211 (strnicmp(data, "nodev", 5) == 0) ||
1212 (strnicmp(data, "noauto", 6) == 0) ||
1213 (strnicmp(data, "dev", 3) == 0)) {
1214 /* The mount tool or mount.cifs helper (if present)
1215 uses these opts to set flags, and the flags are read
1216 by the kernel vfs layer before we get here (ie
1217 before read super) so there is no point trying to
1218 parse these options again and set anything and it
1219 is ok to just ignore them */
1220 continue;
1221 } else if (strnicmp(data, "ro", 2) == 0) {
1222 vol->rw = false;
1223 } else if (strnicmp(data, "hard", 4) == 0) {
1224 vol->retry = 1;
1225 } else if (strnicmp(data, "soft", 4) == 0) {
1226 vol->retry = 0;
1227 } else if (strnicmp(data, "perm", 4) == 0) {
1228 vol->noperm = 0;
1229 } else if (strnicmp(data, "noperm", 6) == 0) {
1230 vol->noperm = 1;
1231 } else if (strnicmp(data, "mapchars", 8) == 0) {
1232 vol->remap = 1;
1233 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1234 vol->remap = 0;
1235 } else if (strnicmp(data, "sfu", 3) == 0) {
1236 vol->sfu_emul = 1;
1237 } else if (strnicmp(data, "nosfu", 5) == 0) {
1238 vol->sfu_emul = 0;
1239 } else if (strnicmp(data, "nodfs", 5) == 0) {
1240 vol->nodfs = 1;
1241 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1242 vol->posix_paths = 1;
1243 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1244 vol->posix_paths = 0;
1245 } else if (strnicmp(data, "nounix", 6) == 0) {
1246 vol->no_linux_ext = 1;
1247 } else if (strnicmp(data, "nolinux", 7) == 0) {
1248 vol->no_linux_ext = 1;
1249 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1250 (strnicmp(data, "ignorecase", 10) == 0)) {
1251 vol->nocase = 1;
1252 } else if (strnicmp(data, "brl", 3) == 0) {
1253 vol->nobrl = 0;
1254 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1255 (strnicmp(data, "nolock", 6) == 0)) {
1256 vol->nobrl = 1;
1257 /* turn off mandatory locking in mode
1258 if remote locking is turned off since the
1259 local vfs will do advisory */
1260 if (vol->file_mode ==
1261 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1262 vol->file_mode = S_IALLUGO;
1263 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1264 /* will take the shorter form "forcemand" as well */
1265 /* This mount option will force use of mandatory
1266 (DOS/Windows style) byte range locks, instead of
1267 using posix advisory byte range locks, even if the
1268 Unix extensions are available and posix locks would
1269 be supported otherwise. If Unix extensions are not
1270 negotiated this has no effect since mandatory locks
1271 would be used (mandatory locks is all that those
1272 those servers support) */
1273 vol->mand_lock = 1;
1274 } else if (strnicmp(data, "setuids", 7) == 0) {
1275 vol->setuids = 1;
1276 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1277 vol->setuids = 0;
1278 } else if (strnicmp(data, "dynperm", 7) == 0) {
1279 vol->dynperm = true;
1280 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1281 vol->dynperm = false;
1282 } else if (strnicmp(data, "nohard", 6) == 0) {
1283 vol->retry = 0;
1284 } else if (strnicmp(data, "nosoft", 6) == 0) {
1285 vol->retry = 1;
1286 } else if (strnicmp(data, "nointr", 6) == 0) {
1287 vol->intr = 0;
1288 } else if (strnicmp(data, "intr", 4) == 0) {
1289 vol->intr = 1;
1290 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1291 vol->nostrictsync = 1;
1292 } else if (strnicmp(data, "strictsync", 10) == 0) {
1293 vol->nostrictsync = 0;
1294 } else if (strnicmp(data, "serverino", 7) == 0) {
1295 vol->server_ino = 1;
1296 } else if (strnicmp(data, "noserverino", 9) == 0) {
1297 vol->server_ino = 0;
1298 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1299 vol->cifs_acl = 1;
1300 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1301 vol->cifs_acl = 0;
1302 } else if (strnicmp(data, "acl", 3) == 0) {
1303 vol->no_psx_acl = 0;
1304 } else if (strnicmp(data, "noacl", 5) == 0) {
1305 vol->no_psx_acl = 1;
1306 #ifdef CONFIG_CIFS_EXPERIMENTAL
1307 } else if (strnicmp(data, "locallease", 6) == 0) {
1308 vol->local_lease = 1;
1309 #endif
1310 } else if (strnicmp(data, "sign", 4) == 0) {
1311 vol->secFlg |= CIFSSEC_MUST_SIGN;
1312 } else if (strnicmp(data, "seal", 4) == 0) {
1313 /* we do not do the following in secFlags because seal
1314 is a per tree connection (mount) not a per socket
1315 or per-smb connection option in the protocol */
1316 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1317 vol->seal = 1;
1318 } else if (strnicmp(data, "direct", 6) == 0) {
1319 vol->direct_io = 1;
1320 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1321 vol->direct_io = 1;
1322 } else if (strnicmp(data, "noac", 4) == 0) {
1323 printk(KERN_WARNING "CIFS: Mount option noac not "
1324 "supported. Instead set "
1325 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1326 } else
1327 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1328 data);
1329 }
1330 if (vol->UNC == NULL) {
1331 if (devname == NULL) {
1332 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1333 "target\n");
1334 return 1;
1335 }
1336 if ((temp_len = strnlen(devname, 300)) < 300) {
1337 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1338 if (vol->UNC == NULL)
1339 return 1;
1340 strcpy(vol->UNC, devname);
1341 if (strncmp(vol->UNC, "//", 2) == 0) {
1342 vol->UNC[0] = '\\';
1343 vol->UNC[1] = '\\';
1344 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1345 printk(KERN_WARNING "CIFS: UNC Path does not "
1346 "begin with // or \\\\ \n");
1347 return 1;
1348 }
1349 value = strpbrk(vol->UNC+2, "/\\");
1350 if (value)
1351 *value = '\\';
1352 } else {
1353 printk(KERN_WARNING "CIFS: UNC name too long\n");
1354 return 1;
1355 }
1356 }
1357 if (vol->UNCip == NULL)
1358 vol->UNCip = &vol->UNC[2];
1359
1360 return 0;
1361 }
1362
1363 static struct TCP_Server_Info *
1364 cifs_find_tcp_session(struct sockaddr_storage *addr)
1365 {
1366 struct list_head *tmp;
1367 struct TCP_Server_Info *server;
1368 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1369 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1370
1371 write_lock(&cifs_tcp_ses_lock);
1372 list_for_each(tmp, &cifs_tcp_ses_list) {
1373 server = list_entry(tmp, struct TCP_Server_Info,
1374 tcp_ses_list);
1375 /*
1376 * the demux thread can exit on its own while still in CifsNew
1377 * so don't accept any sockets in that state. Since the
1378 * tcpStatus never changes back to CifsNew it's safe to check
1379 * for this without a lock.
1380 */
1381 if (server->tcpStatus == CifsNew)
1382 continue;
1383
1384 if (addr->ss_family == AF_INET &&
1385 (addr4->sin_addr.s_addr !=
1386 server->addr.sockAddr.sin_addr.s_addr))
1387 continue;
1388 else if (addr->ss_family == AF_INET6 &&
1389 (!ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1390 &addr6->sin6_addr) ||
1391 server->addr.sockAddr6.sin6_scope_id !=
1392 addr6->sin6_scope_id))
1393 continue;
1394
1395 ++server->srv_count;
1396 write_unlock(&cifs_tcp_ses_lock);
1397 cFYI(1, ("Existing tcp session with server found"));
1398 return server;
1399 }
1400 write_unlock(&cifs_tcp_ses_lock);
1401 return NULL;
1402 }
1403
1404 static void
1405 cifs_put_tcp_session(struct TCP_Server_Info *server)
1406 {
1407 struct task_struct *task;
1408
1409 write_lock(&cifs_tcp_ses_lock);
1410 if (--server->srv_count > 0) {
1411 write_unlock(&cifs_tcp_ses_lock);
1412 return;
1413 }
1414
1415 list_del_init(&server->tcp_ses_list);
1416 write_unlock(&cifs_tcp_ses_lock);
1417
1418 spin_lock(&GlobalMid_Lock);
1419 server->tcpStatus = CifsExiting;
1420 spin_unlock(&GlobalMid_Lock);
1421
1422 task = xchg(&server->tsk, NULL);
1423 if (task)
1424 force_sig(SIGKILL, task);
1425 }
1426
1427 static struct TCP_Server_Info *
1428 cifs_get_tcp_session(struct smb_vol *volume_info)
1429 {
1430 struct TCP_Server_Info *tcp_ses = NULL;
1431 struct sockaddr_storage addr;
1432 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1433 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1434 int rc;
1435
1436 memset(&addr, 0, sizeof(struct sockaddr_storage));
1437
1438 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1439
1440 if (volume_info->UNCip && volume_info->UNC) {
1441 rc = cifs_convert_address(volume_info->UNCip, &addr);
1442 if (!rc) {
1443 /* we failed translating address */
1444 rc = -EINVAL;
1445 goto out_err;
1446 }
1447 } else if (volume_info->UNCip) {
1448 /* BB using ip addr as tcp_ses name to connect to the
1449 DFS root below */
1450 cERROR(1, ("Connecting to DFS root not implemented yet"));
1451 rc = -EINVAL;
1452 goto out_err;
1453 } else /* which tcp_sess DFS root would we conect to */ {
1454 cERROR(1,
1455 ("CIFS mount error: No UNC path (e.g. -o "
1456 "unc=//192.168.1.100/public) specified"));
1457 rc = -EINVAL;
1458 goto out_err;
1459 }
1460
1461 /* see if we already have a matching tcp_ses */
1462 tcp_ses = cifs_find_tcp_session(&addr);
1463 if (tcp_ses)
1464 return tcp_ses;
1465
1466 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1467 if (!tcp_ses) {
1468 rc = -ENOMEM;
1469 goto out_err;
1470 }
1471
1472 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1473 if (IS_ERR(tcp_ses->hostname)) {
1474 rc = PTR_ERR(tcp_ses->hostname);
1475 goto out_err;
1476 }
1477
1478 tcp_ses->noblocksnd = volume_info->noblocksnd;
1479 tcp_ses->noautotune = volume_info->noautotune;
1480 atomic_set(&tcp_ses->inFlight, 0);
1481 init_waitqueue_head(&tcp_ses->response_q);
1482 init_waitqueue_head(&tcp_ses->request_q);
1483 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1484 mutex_init(&tcp_ses->srv_mutex);
1485 memcpy(tcp_ses->workstation_RFC1001_name,
1486 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1487 memcpy(tcp_ses->server_RFC1001_name,
1488 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1489 tcp_ses->sequence_number = 0;
1490 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1491 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1492
1493 /*
1494 * at this point we are the only ones with the pointer
1495 * to the struct since the kernel thread not created yet
1496 * no need to spinlock this init of tcpStatus or srv_count
1497 */
1498 tcp_ses->tcpStatus = CifsNew;
1499 ++tcp_ses->srv_count;
1500
1501 if (addr.ss_family == AF_INET6) {
1502 cFYI(1, ("attempting ipv6 connect"));
1503 /* BB should we allow ipv6 on port 139? */
1504 /* other OS never observed in Wild doing 139 with v6 */
1505 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1506 sizeof(struct sockaddr_in6));
1507 sin_server6->sin6_port = htons(volume_info->port);
1508 rc = ipv6_connect(tcp_ses);
1509 } else {
1510 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1511 sizeof(struct sockaddr_in));
1512 sin_server->sin_port = htons(volume_info->port);
1513 rc = ipv4_connect(tcp_ses);
1514 }
1515 if (rc < 0) {
1516 cERROR(1, ("Error connecting to socket. Aborting operation"));
1517 goto out_err;
1518 }
1519
1520 /*
1521 * since we're in a cifs function already, we know that
1522 * this will succeed. No need for try_module_get().
1523 */
1524 __module_get(THIS_MODULE);
1525 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1526 tcp_ses, "cifsd");
1527 if (IS_ERR(tcp_ses->tsk)) {
1528 rc = PTR_ERR(tcp_ses->tsk);
1529 cERROR(1, ("error %d create cifsd thread", rc));
1530 module_put(THIS_MODULE);
1531 goto out_err;
1532 }
1533
1534 /* thread spawned, put it on the list */
1535 write_lock(&cifs_tcp_ses_lock);
1536 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1537 write_unlock(&cifs_tcp_ses_lock);
1538
1539 return tcp_ses;
1540
1541 out_err:
1542 if (tcp_ses) {
1543 kfree(tcp_ses->hostname);
1544 if (tcp_ses->ssocket)
1545 sock_release(tcp_ses->ssocket);
1546 kfree(tcp_ses);
1547 }
1548 return ERR_PTR(rc);
1549 }
1550
1551 static struct cifsSesInfo *
1552 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1553 {
1554 struct list_head *tmp;
1555 struct cifsSesInfo *ses;
1556
1557 write_lock(&cifs_tcp_ses_lock);
1558 list_for_each(tmp, &server->smb_ses_list) {
1559 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1560 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1561 continue;
1562
1563 ++ses->ses_count;
1564 write_unlock(&cifs_tcp_ses_lock);
1565 return ses;
1566 }
1567 write_unlock(&cifs_tcp_ses_lock);
1568 return NULL;
1569 }
1570
1571 static void
1572 cifs_put_smb_ses(struct cifsSesInfo *ses)
1573 {
1574 int xid;
1575 struct TCP_Server_Info *server = ses->server;
1576
1577 write_lock(&cifs_tcp_ses_lock);
1578 if (--ses->ses_count > 0) {
1579 write_unlock(&cifs_tcp_ses_lock);
1580 return;
1581 }
1582
1583 list_del_init(&ses->smb_ses_list);
1584 write_unlock(&cifs_tcp_ses_lock);
1585
1586 if (ses->status == CifsGood) {
1587 xid = GetXid();
1588 CIFSSMBLogoff(xid, ses);
1589 _FreeXid(xid);
1590 }
1591 sesInfoFree(ses);
1592 cifs_put_tcp_session(server);
1593 }
1594
1595 static struct cifsTconInfo *
1596 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1597 {
1598 struct list_head *tmp;
1599 struct cifsTconInfo *tcon;
1600
1601 write_lock(&cifs_tcp_ses_lock);
1602 list_for_each(tmp, &ses->tcon_list) {
1603 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1604 if (tcon->tidStatus == CifsExiting)
1605 continue;
1606 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1607 continue;
1608
1609 ++tcon->tc_count;
1610 write_unlock(&cifs_tcp_ses_lock);
1611 return tcon;
1612 }
1613 write_unlock(&cifs_tcp_ses_lock);
1614 return NULL;
1615 }
1616
1617 static void
1618 cifs_put_tcon(struct cifsTconInfo *tcon)
1619 {
1620 int xid;
1621 struct cifsSesInfo *ses = tcon->ses;
1622
1623 write_lock(&cifs_tcp_ses_lock);
1624 if (--tcon->tc_count > 0) {
1625 write_unlock(&cifs_tcp_ses_lock);
1626 return;
1627 }
1628
1629 list_del_init(&tcon->tcon_list);
1630 write_unlock(&cifs_tcp_ses_lock);
1631
1632 xid = GetXid();
1633 CIFSSMBTDis(xid, tcon);
1634 _FreeXid(xid);
1635
1636 DeleteTconOplockQEntries(tcon);
1637 tconInfoFree(tcon);
1638 cifs_put_smb_ses(ses);
1639 }
1640
1641 int
1642 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1643 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1644 struct dfs_info3_param **preferrals, int remap)
1645 {
1646 char *temp_unc;
1647 int rc = 0;
1648
1649 *pnum_referrals = 0;
1650 *preferrals = NULL;
1651
1652 if (pSesInfo->ipc_tid == 0) {
1653 temp_unc = kmalloc(2 /* for slashes */ +
1654 strnlen(pSesInfo->serverName,
1655 SERVER_NAME_LEN_WITH_NULL * 2)
1656 + 1 + 4 /* slash IPC$ */ + 2,
1657 GFP_KERNEL);
1658 if (temp_unc == NULL)
1659 return -ENOMEM;
1660 temp_unc[0] = '\\';
1661 temp_unc[1] = '\\';
1662 strcpy(temp_unc + 2, pSesInfo->serverName);
1663 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1664 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1665 cFYI(1,
1666 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1667 kfree(temp_unc);
1668 }
1669 if (rc == 0)
1670 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1671 pnum_referrals, nls_codepage, remap);
1672 /* BB map targetUNCs to dfs_info3 structures, here or
1673 in CIFSGetDFSRefer BB */
1674
1675 return rc;
1676 }
1677
1678 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1679 static struct lock_class_key cifs_key[2];
1680 static struct lock_class_key cifs_slock_key[2];
1681
1682 static inline void
1683 cifs_reclassify_socket4(struct socket *sock)
1684 {
1685 struct sock *sk = sock->sk;
1686 BUG_ON(sock_owned_by_user(sk));
1687 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1688 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1689 }
1690
1691 static inline void
1692 cifs_reclassify_socket6(struct socket *sock)
1693 {
1694 struct sock *sk = sock->sk;
1695 BUG_ON(sock_owned_by_user(sk));
1696 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1697 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1698 }
1699 #else
1700 static inline void
1701 cifs_reclassify_socket4(struct socket *sock)
1702 {
1703 }
1704
1705 static inline void
1706 cifs_reclassify_socket6(struct socket *sock)
1707 {
1708 }
1709 #endif
1710
1711 /* See RFC1001 section 14 on representation of Netbios names */
1712 static void rfc1002mangle(char *target, char *source, unsigned int length)
1713 {
1714 unsigned int i, j;
1715
1716 for (i = 0, j = 0; i < (length); i++) {
1717 /* mask a nibble at a time and encode */
1718 target[j] = 'A' + (0x0F & (source[i] >> 4));
1719 target[j+1] = 'A' + (0x0F & source[i]);
1720 j += 2;
1721 }
1722
1723 }
1724
1725
1726 static int
1727 ipv4_connect(struct TCP_Server_Info *server)
1728 {
1729 int rc = 0;
1730 bool connected = false;
1731 __be16 orig_port = 0;
1732 struct socket *socket = server->ssocket;
1733
1734 if (socket == NULL) {
1735 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1736 IPPROTO_TCP, &socket);
1737 if (rc < 0) {
1738 cERROR(1, ("Error %d creating socket", rc));
1739 return rc;
1740 }
1741
1742 /* BB other socket options to set KEEPALIVE, NODELAY? */
1743 cFYI(1, ("Socket created"));
1744 server->ssocket = socket;
1745 socket->sk->sk_allocation = GFP_NOFS;
1746 cifs_reclassify_socket4(socket);
1747 }
1748
1749 /* user overrode default port */
1750 if (server->addr.sockAddr.sin_port) {
1751 rc = socket->ops->connect(socket, (struct sockaddr *)
1752 &server->addr.sockAddr,
1753 sizeof(struct sockaddr_in), 0);
1754 if (rc >= 0)
1755 connected = true;
1756 }
1757
1758 if (!connected) {
1759 /* save original port so we can retry user specified port
1760 later if fall back ports fail this time */
1761 orig_port = server->addr.sockAddr.sin_port;
1762
1763 /* do not retry on the same port we just failed on */
1764 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1765 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1766 rc = socket->ops->connect(socket,
1767 (struct sockaddr *)
1768 &server->addr.sockAddr,
1769 sizeof(struct sockaddr_in), 0);
1770 if (rc >= 0)
1771 connected = true;
1772 }
1773 }
1774 if (!connected) {
1775 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1776 rc = socket->ops->connect(socket, (struct sockaddr *)
1777 &server->addr.sockAddr,
1778 sizeof(struct sockaddr_in), 0);
1779 if (rc >= 0)
1780 connected = true;
1781 }
1782
1783 /* give up here - unless we want to retry on different
1784 protocol families some day */
1785 if (!connected) {
1786 if (orig_port)
1787 server->addr.sockAddr.sin_port = orig_port;
1788 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1789 sock_release(socket);
1790 server->ssocket = NULL;
1791 return rc;
1792 }
1793
1794
1795 /*
1796 * Eventually check for other socket options to change from
1797 * the default. sock_setsockopt not used because it expects
1798 * user space buffer
1799 */
1800 socket->sk->sk_rcvtimeo = 7 * HZ;
1801 socket->sk->sk_sndtimeo = 5 * HZ;
1802
1803 /* make the bufsizes depend on wsize/rsize and max requests */
1804 if (server->noautotune) {
1805 if (socket->sk->sk_sndbuf < (200 * 1024))
1806 socket->sk->sk_sndbuf = 200 * 1024;
1807 if (socket->sk->sk_rcvbuf < (140 * 1024))
1808 socket->sk->sk_rcvbuf = 140 * 1024;
1809 }
1810
1811 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1812 socket->sk->sk_sndbuf,
1813 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1814
1815 /* send RFC1001 sessinit */
1816 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1817 /* some servers require RFC1001 sessinit before sending
1818 negprot - BB check reconnection in case where second
1819 sessinit is sent but no second negprot */
1820 struct rfc1002_session_packet *ses_init_buf;
1821 struct smb_hdr *smb_buf;
1822 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1823 GFP_KERNEL);
1824 if (ses_init_buf) {
1825 ses_init_buf->trailer.session_req.called_len = 32;
1826 if (server->server_RFC1001_name &&
1827 server->server_RFC1001_name[0] != 0)
1828 rfc1002mangle(ses_init_buf->trailer.
1829 session_req.called_name,
1830 server->server_RFC1001_name,
1831 RFC1001_NAME_LEN_WITH_NULL);
1832 else
1833 rfc1002mangle(ses_init_buf->trailer.
1834 session_req.called_name,
1835 DEFAULT_CIFS_CALLED_NAME,
1836 RFC1001_NAME_LEN_WITH_NULL);
1837
1838 ses_init_buf->trailer.session_req.calling_len = 32;
1839
1840 /* calling name ends in null (byte 16) from old smb
1841 convention. */
1842 if (server->workstation_RFC1001_name &&
1843 server->workstation_RFC1001_name[0] != 0)
1844 rfc1002mangle(ses_init_buf->trailer.
1845 session_req.calling_name,
1846 server->workstation_RFC1001_name,
1847 RFC1001_NAME_LEN_WITH_NULL);
1848 else
1849 rfc1002mangle(ses_init_buf->trailer.
1850 session_req.calling_name,
1851 "LINUX_CIFS_CLNT",
1852 RFC1001_NAME_LEN_WITH_NULL);
1853
1854 ses_init_buf->trailer.session_req.scope1 = 0;
1855 ses_init_buf->trailer.session_req.scope2 = 0;
1856 smb_buf = (struct smb_hdr *)ses_init_buf;
1857 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1858 smb_buf->smb_buf_length = 0x81000044;
1859 rc = smb_send(server, smb_buf, 0x44);
1860 kfree(ses_init_buf);
1861 msleep(1); /* RFC1001 layer in at least one server
1862 requires very short break before negprot
1863 presumably because not expecting negprot
1864 to follow so fast. This is a simple
1865 solution that works without
1866 complicating the code and causes no
1867 significant slowing down on mount
1868 for everyone else */
1869 }
1870 /* else the negprot may still work without this
1871 even though malloc failed */
1872
1873 }
1874
1875 return rc;
1876 }
1877
1878 static int
1879 ipv6_connect(struct TCP_Server_Info *server)
1880 {
1881 int rc = 0;
1882 bool connected = false;
1883 __be16 orig_port = 0;
1884 struct socket *socket = server->ssocket;
1885
1886 if (socket == NULL) {
1887 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1888 IPPROTO_TCP, &socket);
1889 if (rc < 0) {
1890 cERROR(1, ("Error %d creating ipv6 socket", rc));
1891 socket = NULL;
1892 return rc;
1893 }
1894
1895 /* BB other socket options to set KEEPALIVE, NODELAY? */
1896 cFYI(1, ("ipv6 Socket created"));
1897 server->ssocket = socket;
1898 socket->sk->sk_allocation = GFP_NOFS;
1899 cifs_reclassify_socket6(socket);
1900 }
1901
1902 /* user overrode default port */
1903 if (server->addr.sockAddr6.sin6_port) {
1904 rc = socket->ops->connect(socket,
1905 (struct sockaddr *) &server->addr.sockAddr6,
1906 sizeof(struct sockaddr_in6), 0);
1907 if (rc >= 0)
1908 connected = true;
1909 }
1910
1911 if (!connected) {
1912 /* save original port so we can retry user specified port
1913 later if fall back ports fail this time */
1914
1915 orig_port = server->addr.sockAddr6.sin6_port;
1916 /* do not retry on the same port we just failed on */
1917 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1918 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1919 rc = socket->ops->connect(socket, (struct sockaddr *)
1920 &server->addr.sockAddr6,
1921 sizeof(struct sockaddr_in6), 0);
1922 if (rc >= 0)
1923 connected = true;
1924 }
1925 }
1926 if (!connected) {
1927 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1928 rc = socket->ops->connect(socket, (struct sockaddr *)
1929 &server->addr.sockAddr6,
1930 sizeof(struct sockaddr_in6), 0);
1931 if (rc >= 0)
1932 connected = true;
1933 }
1934
1935 /* give up here - unless we want to retry on different
1936 protocol families some day */
1937 if (!connected) {
1938 if (orig_port)
1939 server->addr.sockAddr6.sin6_port = orig_port;
1940 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1941 sock_release(socket);
1942 server->ssocket = NULL;
1943 return rc;
1944 }
1945
1946 /*
1947 * Eventually check for other socket options to change from
1948 * the default. sock_setsockopt not used because it expects
1949 * user space buffer
1950 */
1951 socket->sk->sk_rcvtimeo = 7 * HZ;
1952 socket->sk->sk_sndtimeo = 5 * HZ;
1953 server->ssocket = socket;
1954
1955 return rc;
1956 }
1957
1958 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1959 struct super_block *sb, struct smb_vol *vol_info)
1960 {
1961 /* if we are reconnecting then should we check to see if
1962 * any requested capabilities changed locally e.g. via
1963 * remount but we can not do much about it here
1964 * if they have (even if we could detect it by the following)
1965 * Perhaps we could add a backpointer to array of sb from tcon
1966 * or if we change to make all sb to same share the same
1967 * sb as NFS - then we only have one backpointer to sb.
1968 * What if we wanted to mount the server share twice once with
1969 * and once without posixacls or posix paths? */
1970 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1971
1972 if (vol_info && vol_info->no_linux_ext) {
1973 tcon->fsUnixInfo.Capability = 0;
1974 tcon->unix_ext = 0; /* Unix Extensions disabled */
1975 cFYI(1, ("Linux protocol extensions disabled"));
1976 return;
1977 } else if (vol_info)
1978 tcon->unix_ext = 1; /* Unix Extensions supported */
1979
1980 if (tcon->unix_ext == 0) {
1981 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1982 return;
1983 }
1984
1985 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1986 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1987
1988 /* check for reconnect case in which we do not
1989 want to change the mount behavior if we can avoid it */
1990 if (vol_info == NULL) {
1991 /* turn off POSIX ACL and PATHNAMES if not set
1992 originally at mount time */
1993 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1994 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1995 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1996 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1997 cERROR(1, ("POSIXPATH support change"));
1998 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1999 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2000 cERROR(1, ("possible reconnect error"));
2001 cERROR(1,
2002 ("server disabled POSIX path support"));
2003 }
2004 }
2005
2006 cap &= CIFS_UNIX_CAP_MASK;
2007 if (vol_info && vol_info->no_psx_acl)
2008 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2009 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2010 cFYI(1, ("negotiated posix acl support"));
2011 if (sb)
2012 sb->s_flags |= MS_POSIXACL;
2013 }
2014
2015 if (vol_info && vol_info->posix_paths == 0)
2016 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2017 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2018 cFYI(1, ("negotiate posix pathnames"));
2019 if (sb)
2020 CIFS_SB(sb)->mnt_cifs_flags |=
2021 CIFS_MOUNT_POSIX_PATHS;
2022 }
2023
2024 /* We might be setting the path sep back to a different
2025 form if we are reconnecting and the server switched its
2026 posix path capability for this share */
2027 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2028 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2029
2030 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2031 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2032 CIFS_SB(sb)->rsize = 127 * 1024;
2033 cFYI(DBG2,
2034 ("larger reads not supported by srv"));
2035 }
2036 }
2037
2038
2039 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2040 #ifdef CONFIG_CIFS_DEBUG2
2041 if (cap & CIFS_UNIX_FCNTL_CAP)
2042 cFYI(1, ("FCNTL cap"));
2043 if (cap & CIFS_UNIX_EXTATTR_CAP)
2044 cFYI(1, ("EXTATTR cap"));
2045 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2046 cFYI(1, ("POSIX path cap"));
2047 if (cap & CIFS_UNIX_XATTR_CAP)
2048 cFYI(1, ("XATTR cap"));
2049 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2050 cFYI(1, ("POSIX ACL cap"));
2051 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2052 cFYI(1, ("very large read cap"));
2053 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2054 cFYI(1, ("very large write cap"));
2055 #endif /* CIFS_DEBUG2 */
2056 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2057 if (vol_info == NULL) {
2058 cFYI(1, ("resetting capabilities failed"));
2059 } else
2060 cERROR(1, ("Negotiating Unix capabilities "
2061 "with the server failed. Consider "
2062 "mounting with the Unix Extensions\n"
2063 "disabled, if problems are found, "
2064 "by specifying the nounix mount "
2065 "option."));
2066
2067 }
2068 }
2069 }
2070
2071 static void
2072 convert_delimiter(char *path, char delim)
2073 {
2074 int i;
2075 char old_delim;
2076
2077 if (path == NULL)
2078 return;
2079
2080 if (delim == '/')
2081 old_delim = '\\';
2082 else
2083 old_delim = '/';
2084
2085 for (i = 0; path[i] != '\0'; i++) {
2086 if (path[i] == old_delim)
2087 path[i] = delim;
2088 }
2089 }
2090
2091 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2092 struct cifs_sb_info *cifs_sb)
2093 {
2094 if (pvolume_info->rsize > CIFSMaxBufSize) {
2095 cERROR(1, ("rsize %d too large, using MaxBufSize",
2096 pvolume_info->rsize));
2097 cifs_sb->rsize = CIFSMaxBufSize;
2098 } else if ((pvolume_info->rsize) &&
2099 (pvolume_info->rsize <= CIFSMaxBufSize))
2100 cifs_sb->rsize = pvolume_info->rsize;
2101 else /* default */
2102 cifs_sb->rsize = CIFSMaxBufSize;
2103
2104 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2105 cERROR(1, ("wsize %d too large, using 4096 instead",
2106 pvolume_info->wsize));
2107 cifs_sb->wsize = 4096;
2108 } else if (pvolume_info->wsize)
2109 cifs_sb->wsize = pvolume_info->wsize;
2110 else
2111 cifs_sb->wsize = min_t(const int,
2112 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2113 127*1024);
2114 /* old default of CIFSMaxBufSize was too small now
2115 that SMB Write2 can send multiple pages in kvec.
2116 RFC1001 does not describe what happens when frame
2117 bigger than 128K is sent so use that as max in
2118 conjunction with 52K kvec constraint on arch with 4K
2119 page size */
2120
2121 if (cifs_sb->rsize < 2048) {
2122 cifs_sb->rsize = 2048;
2123 /* Windows ME may prefer this */
2124 cFYI(1, ("readsize set to minimum: 2048"));
2125 }
2126 /* calculate prepath */
2127 cifs_sb->prepath = pvolume_info->prepath;
2128 if (cifs_sb->prepath) {
2129 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2130 /* we can not convert the / to \ in the path
2131 separators in the prefixpath yet because we do not
2132 know (until reset_cifs_unix_caps is called later)
2133 whether POSIX PATH CAP is available. We normalize
2134 the / to \ after reset_cifs_unix_caps is called */
2135 pvolume_info->prepath = NULL;
2136 } else
2137 cifs_sb->prepathlen = 0;
2138 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2139 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2140 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2141 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2142 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2143 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2144
2145 if (pvolume_info->noperm)
2146 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2147 if (pvolume_info->setuids)
2148 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2149 if (pvolume_info->server_ino)
2150 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2151 if (pvolume_info->remap)
2152 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2153 if (pvolume_info->no_xattr)
2154 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2155 if (pvolume_info->sfu_emul)
2156 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2157 if (pvolume_info->nobrl)
2158 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2159 if (pvolume_info->nostrictsync)
2160 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2161 if (pvolume_info->mand_lock)
2162 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2163 if (pvolume_info->cifs_acl)
2164 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2165 if (pvolume_info->override_uid)
2166 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2167 if (pvolume_info->override_gid)
2168 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2169 if (pvolume_info->dynperm)
2170 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2171 if (pvolume_info->direct_io) {
2172 cFYI(1, ("mounting share using direct i/o"));
2173 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2174 }
2175
2176 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2177 cERROR(1, ("mount option dynperm ignored if cifsacl "
2178 "mount option supported"));
2179 }
2180
2181 static int
2182 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2183 struct cifs_sb_info *cifs_sb, const char *full_path)
2184 {
2185 int rc;
2186 __u64 inode_num;
2187 FILE_ALL_INFO *pfile_info;
2188
2189 rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2190 cifs_sb->local_nls,
2191 cifs_sb->mnt_cifs_flags &
2192 CIFS_MOUNT_MAP_SPECIAL_CHR);
2193 if (rc != -EOPNOTSUPP)
2194 return rc;
2195
2196 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2197 if (pfile_info == NULL)
2198 return -ENOMEM;
2199
2200 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2201 0 /* not legacy */, cifs_sb->local_nls,
2202 cifs_sb->mnt_cifs_flags &
2203 CIFS_MOUNT_MAP_SPECIAL_CHR);
2204 kfree(pfile_info);
2205 return rc;
2206 }
2207
2208 static void
2209 cleanup_volume_info(struct smb_vol **pvolume_info)
2210 {
2211 struct smb_vol *volume_info;
2212
2213 if (!pvolume_info && !*pvolume_info)
2214 return;
2215
2216 volume_info = *pvolume_info;
2217 kzfree(volume_info->password);
2218 kfree(volume_info->UNC);
2219 kfree(volume_info->prepath);
2220 kfree(volume_info);
2221 *pvolume_info = NULL;
2222 return;
2223 }
2224
2225 #ifdef CONFIG_CIFS_DFS_UPCALL
2226 /* build_path_to_root returns full path to root when
2227 * we do not have an exiting connection (tcon) */
2228 static char *
2229 build_unc_path_to_root(const struct smb_vol *volume_info,
2230 const struct cifs_sb_info *cifs_sb)
2231 {
2232 char *full_path;
2233
2234 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2235 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2236 if (full_path == NULL)
2237 return ERR_PTR(-ENOMEM);
2238
2239 strncpy(full_path, volume_info->UNC, unc_len);
2240 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2241 int i;
2242 for (i = 0; i < unc_len; i++) {
2243 if (full_path[i] == '\\')
2244 full_path[i] = '/';
2245 }
2246 }
2247
2248 if (cifs_sb->prepathlen)
2249 strncpy(full_path + unc_len, cifs_sb->prepath,
2250 cifs_sb->prepathlen);
2251
2252 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2253 return full_path;
2254 }
2255 #endif
2256
2257 int
2258 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2259 char *mount_data_global, const char *devname)
2260 {
2261 int rc = 0;
2262 int xid;
2263 struct smb_vol *volume_info;
2264 struct cifsSesInfo *pSesInfo = NULL;
2265 struct cifsTconInfo *tcon = NULL;
2266 struct TCP_Server_Info *srvTcp = NULL;
2267 char *full_path;
2268 char *mount_data = mount_data_global;
2269 #ifdef CONFIG_CIFS_DFS_UPCALL
2270 struct dfs_info3_param *referrals = NULL;
2271 unsigned int num_referrals = 0;
2272 int referral_walks_count = 0;
2273 try_mount_again:
2274 #endif
2275 full_path = NULL;
2276
2277 xid = GetXid();
2278
2279 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2280 if (!volume_info) {
2281 rc = -ENOMEM;
2282 goto out;
2283 }
2284
2285 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2286 rc = -EINVAL;
2287 goto out;
2288 }
2289
2290 if (volume_info->nullauth) {
2291 cFYI(1, ("null user"));
2292 volume_info->username = "";
2293 } else if (volume_info->username) {
2294 /* BB fixme parse for domain name here */
2295 cFYI(1, ("Username: %s", volume_info->username));
2296 } else {
2297 cifserror("No username specified");
2298 /* In userspace mount helper we can get user name from alternate
2299 locations such as env variables and files on disk */
2300 rc = -EINVAL;
2301 goto out;
2302 }
2303
2304
2305 /* this is needed for ASCII cp to Unicode converts */
2306 if (volume_info->iocharset == NULL) {
2307 cifs_sb->local_nls = load_nls_default();
2308 /* load_nls_default can not return null */
2309 } else {
2310 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2311 if (cifs_sb->local_nls == NULL) {
2312 cERROR(1, ("CIFS mount error: iocharset %s not found",
2313 volume_info->iocharset));
2314 rc = -ELIBACC;
2315 goto out;
2316 }
2317 }
2318
2319 /* get a reference to a tcp session */
2320 srvTcp = cifs_get_tcp_session(volume_info);
2321 if (IS_ERR(srvTcp)) {
2322 rc = PTR_ERR(srvTcp);
2323 goto out;
2324 }
2325
2326 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2327 if (pSesInfo) {
2328 cFYI(1, ("Existing smb sess found (status=%d)",
2329 pSesInfo->status));
2330 /*
2331 * The existing SMB session already has a reference to srvTcp,
2332 * so we can put back the extra one we got before
2333 */
2334 cifs_put_tcp_session(srvTcp);
2335
2336 down(&pSesInfo->sesSem);
2337 if (pSesInfo->need_reconnect) {
2338 cFYI(1, ("Session needs reconnect"));
2339 rc = cifs_setup_session(xid, pSesInfo,
2340 cifs_sb->local_nls);
2341 }
2342 up(&pSesInfo->sesSem);
2343 } else if (!rc) {
2344 cFYI(1, ("Existing smb sess not found"));
2345 pSesInfo = sesInfoAlloc();
2346 if (pSesInfo == NULL) {
2347 rc = -ENOMEM;
2348 goto mount_fail_check;
2349 }
2350
2351 /* new SMB session uses our srvTcp ref */
2352 pSesInfo->server = srvTcp;
2353 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2354 sprintf(pSesInfo->serverName, "%pI6",
2355 &srvTcp->addr.sockAddr6.sin6_addr);
2356 else
2357 sprintf(pSesInfo->serverName, "%pI4",
2358 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2359
2360 write_lock(&cifs_tcp_ses_lock);
2361 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2362 write_unlock(&cifs_tcp_ses_lock);
2363
2364 /* volume_info->password freed at unmount */
2365 if (volume_info->password) {
2366 pSesInfo->password = kstrdup(volume_info->password,
2367 GFP_KERNEL);
2368 if (!pSesInfo->password) {
2369 rc = -ENOMEM;
2370 goto mount_fail_check;
2371 }
2372 }
2373 if (volume_info->username)
2374 strncpy(pSesInfo->userName, volume_info->username,
2375 MAX_USERNAME_SIZE);
2376 if (volume_info->domainname) {
2377 int len = strlen(volume_info->domainname);
2378 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2379 if (pSesInfo->domainName)
2380 strcpy(pSesInfo->domainName,
2381 volume_info->domainname);
2382 }
2383 pSesInfo->linux_uid = volume_info->linux_uid;
2384 pSesInfo->overrideSecFlg = volume_info->secFlg;
2385 down(&pSesInfo->sesSem);
2386
2387 /* BB FIXME need to pass vol->secFlgs BB */
2388 rc = cifs_setup_session(xid, pSesInfo,
2389 cifs_sb->local_nls);
2390 up(&pSesInfo->sesSem);
2391 }
2392
2393 /* search for existing tcon to this server share */
2394 if (!rc) {
2395 setup_cifs_sb(volume_info, cifs_sb);
2396
2397 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2398 if (tcon) {
2399 cFYI(1, ("Found match on UNC path"));
2400 /* existing tcon already has a reference */
2401 cifs_put_smb_ses(pSesInfo);
2402 if (tcon->seal != volume_info->seal)
2403 cERROR(1, ("transport encryption setting "
2404 "conflicts with existing tid"));
2405 } else {
2406 tcon = tconInfoAlloc();
2407 if (tcon == NULL) {
2408 rc = -ENOMEM;
2409 goto mount_fail_check;
2410 }
2411
2412 tcon->ses = pSesInfo;
2413 if (volume_info->password) {
2414 tcon->password = kstrdup(volume_info->password,
2415 GFP_KERNEL);
2416 if (!tcon->password) {
2417 rc = -ENOMEM;
2418 goto mount_fail_check;
2419 }
2420 }
2421
2422 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2423 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2424 cERROR(1, ("Missing share name"));
2425 rc = -ENODEV;
2426 goto mount_fail_check;
2427 } else {
2428 /* BB Do we need to wrap sesSem around
2429 * this TCon call and Unix SetFS as
2430 * we do on SessSetup and reconnect? */
2431 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2432 tcon, cifs_sb->local_nls);
2433 cFYI(1, ("CIFS Tcon rc = %d", rc));
2434 if (volume_info->nodfs) {
2435 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2436 cFYI(1, ("DFS disabled (%d)",
2437 tcon->Flags));
2438 }
2439 }
2440 if (rc)
2441 goto remote_path_check;
2442 tcon->seal = volume_info->seal;
2443 write_lock(&cifs_tcp_ses_lock);
2444 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2445 write_unlock(&cifs_tcp_ses_lock);
2446 }
2447
2448 /* we can have only one retry value for a connection
2449 to a share so for resources mounted more than once
2450 to the same server share the last value passed in
2451 for the retry flag is used */
2452 tcon->retry = volume_info->retry;
2453 tcon->nocase = volume_info->nocase;
2454 tcon->local_lease = volume_info->local_lease;
2455 }
2456 if (pSesInfo) {
2457 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2458 sb->s_maxbytes = (u64) 1 << 63;
2459 } else
2460 sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2461 }
2462
2463 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2464 sb->s_time_gran = 100;
2465
2466 if (rc)
2467 goto remote_path_check;
2468
2469 cifs_sb->tcon = tcon;
2470
2471 /* do not care if following two calls succeed - informational */
2472 if (!tcon->ipc) {
2473 CIFSSMBQFSDeviceInfo(xid, tcon);
2474 CIFSSMBQFSAttributeInfo(xid, tcon);
2475 }
2476
2477 /* tell server which Unix caps we support */
2478 if (tcon->ses->capabilities & CAP_UNIX)
2479 /* reset of caps checks mount to see if unix extensions
2480 disabled for just this mount */
2481 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2482 else
2483 tcon->unix_ext = 0; /* server does not support them */
2484
2485 /* convert forward to back slashes in prepath here if needed */
2486 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2487 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2488
2489 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2490 cifs_sb->rsize = 1024 * 127;
2491 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2492 }
2493 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2494 cifs_sb->wsize = min(cifs_sb->wsize,
2495 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2496 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2497 cifs_sb->rsize = min(cifs_sb->rsize,
2498 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2499
2500 remote_path_check:
2501 /* check if a whole path (including prepath) is not remote */
2502 if (!rc && cifs_sb->prepathlen && tcon) {
2503 /* build_path_to_root works only when we have a valid tcon */
2504 full_path = cifs_build_path_to_root(cifs_sb);
2505 if (full_path == NULL) {
2506 rc = -ENOMEM;
2507 goto mount_fail_check;
2508 }
2509 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2510 if (rc != -EREMOTE) {
2511 kfree(full_path);
2512 goto mount_fail_check;
2513 }
2514 kfree(full_path);
2515 }
2516
2517 /* get referral if needed */
2518 if (rc == -EREMOTE) {
2519 #ifdef CONFIG_CIFS_DFS_UPCALL
2520 if (referral_walks_count > MAX_NESTED_LINKS) {
2521 /*
2522 * BB: when we implement proper loop detection,
2523 * we will remove this check. But now we need it
2524 * to prevent an indefinite loop if 'DFS tree' is
2525 * misconfigured (i.e. has loops).
2526 */
2527 rc = -ELOOP;
2528 goto mount_fail_check;
2529 }
2530 /* convert forward to back slashes in prepath here if needed */
2531 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2532 convert_delimiter(cifs_sb->prepath,
2533 CIFS_DIR_SEP(cifs_sb));
2534 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2535 if (IS_ERR(full_path)) {
2536 rc = PTR_ERR(full_path);
2537 goto mount_fail_check;
2538 }
2539
2540 cFYI(1, ("Getting referral for: %s", full_path));
2541 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2542 cifs_sb->local_nls, &num_referrals, &referrals,
2543 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2544 if (!rc && num_referrals > 0) {
2545 char *fake_devname = NULL;
2546
2547 if (mount_data != mount_data_global)
2548 kfree(mount_data);
2549 mount_data = cifs_compose_mount_options(
2550 cifs_sb->mountdata, full_path + 1,
2551 referrals, &fake_devname);
2552 kfree(fake_devname);
2553 free_dfs_info_array(referrals, num_referrals);
2554
2555 if (tcon)
2556 cifs_put_tcon(tcon);
2557 else if (pSesInfo)
2558 cifs_put_smb_ses(pSesInfo);
2559
2560 cleanup_volume_info(&volume_info);
2561 FreeXid(xid);
2562 kfree(full_path);
2563 referral_walks_count++;
2564 goto try_mount_again;
2565 }
2566 #else /* No DFS support, return error on mount */
2567 rc = -EOPNOTSUPP;
2568 #endif
2569 }
2570
2571 mount_fail_check:
2572 /* on error free sesinfo and tcon struct if needed */
2573 if (rc) {
2574 if (mount_data != mount_data_global)
2575 kfree(mount_data);
2576 /* If find_unc succeeded then rc == 0 so we can not end */
2577 /* up accidently freeing someone elses tcon struct */
2578 if (tcon)
2579 cifs_put_tcon(tcon);
2580 else if (pSesInfo)
2581 cifs_put_smb_ses(pSesInfo);
2582 else
2583 cifs_put_tcp_session(srvTcp);
2584 goto out;
2585 }
2586
2587 /* volume_info->password is freed above when existing session found
2588 (in which case it is not needed anymore) but when new sesion is created
2589 the password ptr is put in the new session structure (in which case the
2590 password will be freed at unmount time) */
2591 out:
2592 /* zero out password before freeing */
2593 cleanup_volume_info(&volume_info);
2594 FreeXid(xid);
2595 return rc;
2596 }
2597
2598 int
2599 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2600 const char *tree, struct cifsTconInfo *tcon,
2601 const struct nls_table *nls_codepage)
2602 {
2603 struct smb_hdr *smb_buffer;
2604 struct smb_hdr *smb_buffer_response;
2605 TCONX_REQ *pSMB;
2606 TCONX_RSP *pSMBr;
2607 unsigned char *bcc_ptr;
2608 int rc = 0;
2609 int length, bytes_left;
2610 __u16 count;
2611
2612 if (ses == NULL)
2613 return -EIO;
2614
2615 smb_buffer = cifs_buf_get();
2616 if (smb_buffer == NULL) {
2617 return -ENOMEM;
2618 }
2619 smb_buffer_response = smb_buffer;
2620
2621 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2622 NULL /*no tid */ , 4 /*wct */ );
2623
2624 smb_buffer->Mid = GetNextMid(ses->server);
2625 smb_buffer->Uid = ses->Suid;
2626 pSMB = (TCONX_REQ *) smb_buffer;
2627 pSMBr = (TCONX_RSP *) smb_buffer_response;
2628
2629 pSMB->AndXCommand = 0xFF;
2630 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2631 bcc_ptr = &pSMB->Password[0];
2632 if ((ses->server->secMode) & SECMODE_USER) {
2633 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2634 *bcc_ptr = 0; /* password is null byte */
2635 bcc_ptr++; /* skip password */
2636 /* already aligned so no need to do it below */
2637 } else {
2638 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2639 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2640 specified as required (when that support is added to
2641 the vfs in the future) as only NTLM or the much
2642 weaker LANMAN (which we do not send by default) is accepted
2643 by Samba (not sure whether other servers allow
2644 NTLMv2 password here) */
2645 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2646 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2647 (ses->server->secType == LANMAN))
2648 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2649 ses->server->secMode &
2650 SECMODE_PW_ENCRYPT ? true : false,
2651 bcc_ptr);
2652 else
2653 #endif /* CIFS_WEAK_PW_HASH */
2654 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2655 bcc_ptr);
2656
2657 bcc_ptr += CIFS_SESS_KEY_SIZE;
2658 if (ses->capabilities & CAP_UNICODE) {
2659 /* must align unicode strings */
2660 *bcc_ptr = 0; /* null byte password */
2661 bcc_ptr++;
2662 }
2663 }
2664
2665 if (ses->server->secMode &
2666 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2667 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2668
2669 if (ses->capabilities & CAP_STATUS32) {
2670 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2671 }
2672 if (ses->capabilities & CAP_DFS) {
2673 smb_buffer->Flags2 |= SMBFLG2_DFS;
2674 }
2675 if (ses->capabilities & CAP_UNICODE) {
2676 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2677 length =
2678 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2679 6 /* max utf8 char length in bytes */ *
2680 (/* server len*/ + 256 /* share len */), nls_codepage);
2681 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2682 bcc_ptr += 2; /* skip trailing null */
2683 } else { /* ASCII */
2684 strcpy(bcc_ptr, tree);
2685 bcc_ptr += strlen(tree) + 1;
2686 }
2687 strcpy(bcc_ptr, "?????");
2688 bcc_ptr += strlen("?????");
2689 bcc_ptr += 1;
2690 count = bcc_ptr - &pSMB->Password[0];
2691 pSMB->hdr.smb_buf_length += count;
2692 pSMB->ByteCount = cpu_to_le16(count);
2693
2694 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2695 CIFS_STD_OP);
2696
2697 /* above now done in SendReceive */
2698 if ((rc == 0) && (tcon != NULL)) {
2699 bool is_unicode;
2700
2701 tcon->tidStatus = CifsGood;
2702 tcon->need_reconnect = false;
2703 tcon->tid = smb_buffer_response->Tid;
2704 bcc_ptr = pByteArea(smb_buffer_response);
2705 bytes_left = BCC(smb_buffer_response);
2706 length = strnlen(bcc_ptr, bytes_left - 2);
2707 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2708 is_unicode = true;
2709 else
2710 is_unicode = false;
2711
2712
2713 /* skip service field (NB: this field is always ASCII) */
2714 if (length == 3) {
2715 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2716 (bcc_ptr[2] == 'C')) {
2717 cFYI(1, ("IPC connection"));
2718 tcon->ipc = 1;
2719 }
2720 } else if (length == 2) {
2721 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2722 /* the most common case */
2723 cFYI(1, ("disk share connection"));
2724 }
2725 }
2726 bcc_ptr += length + 1;
2727 bytes_left -= (length + 1);
2728 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2729
2730 /* mostly informational -- no need to fail on error here */
2731 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2732 bytes_left, is_unicode,
2733 nls_codepage);
2734
2735 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2736
2737 if ((smb_buffer_response->WordCount == 3) ||
2738 (smb_buffer_response->WordCount == 7))
2739 /* field is in same location */
2740 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2741 else
2742 tcon->Flags = 0;
2743 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2744 } else if ((rc == 0) && tcon == NULL) {
2745 /* all we need to save for IPC$ connection */
2746 ses->ipc_tid = smb_buffer_response->Tid;
2747 }
2748
2749 cifs_buf_release(smb_buffer);
2750 return rc;
2751 }
2752
2753 int
2754 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2755 {
2756 int rc = 0;
2757 char *tmp;
2758
2759 if (cifs_sb->tcon)
2760 cifs_put_tcon(cifs_sb->tcon);
2761
2762 cifs_sb->tcon = NULL;
2763 tmp = cifs_sb->prepath;
2764 cifs_sb->prepathlen = 0;
2765 cifs_sb->prepath = NULL;
2766 kfree(tmp);
2767
2768 return rc;
2769 }
2770
2771 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2772 struct nls_table *nls_info)
2773 {
2774 int rc = 0;
2775 int first_time = 0;
2776 struct TCP_Server_Info *server = pSesInfo->server;
2777
2778 /* what if server changes its buffer size after dropping the session? */
2779 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2780 rc = CIFSSMBNegotiate(xid, pSesInfo);
2781 if (rc == -EAGAIN) {
2782 /* retry only once on 1st time connection */
2783 rc = CIFSSMBNegotiate(xid, pSesInfo);
2784 if (rc == -EAGAIN)
2785 rc = -EHOSTDOWN;
2786 }
2787 if (rc == 0) {
2788 spin_lock(&GlobalMid_Lock);
2789 if (server->tcpStatus != CifsExiting)
2790 server->tcpStatus = CifsGood;
2791 else
2792 rc = -EHOSTDOWN;
2793 spin_unlock(&GlobalMid_Lock);
2794
2795 }
2796 first_time = 1;
2797 }
2798
2799 if (rc)
2800 goto ss_err_exit;
2801
2802 pSesInfo->flags = 0;
2803 pSesInfo->capabilities = server->capabilities;
2804 if (linuxExtEnabled == 0)
2805 pSesInfo->capabilities &= (~CAP_UNIX);
2806
2807 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2808 server->secMode, server->capabilities, server->timeAdj));
2809
2810 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2811 if (rc) {
2812 cERROR(1, ("Send error in SessSetup = %d", rc));
2813 } else {
2814 cFYI(1, ("CIFS Session Established successfully"));
2815 spin_lock(&GlobalMid_Lock);
2816 pSesInfo->status = CifsGood;
2817 pSesInfo->need_reconnect = false;
2818 spin_unlock(&GlobalMid_Lock);
2819 }
2820
2821 ss_err_exit:
2822 return rc;
2823 }
2824
Linux kernel - Deliverables
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