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cifs: move address comparison into separate function
[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/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 #include "fscache.h"
52
53 #define CIFS_PORT 445
54 #define RFC1001_PORT 139
55
56 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
57 unsigned char *p24);
58
59 extern mempool_t *cifs_req_poolp;
60
61 struct smb_vol {
62 char *username;
63 char *password;
64 char *domainname;
65 char *UNC;
66 char *UNCip;
67 char *iocharset; /* local code page for mapping to and from Unicode */
68 char source_rfc1001_name[16]; /* netbios name of client */
69 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
70 uid_t linux_uid;
71 gid_t linux_gid;
72 mode_t file_mode;
73 mode_t dir_mode;
74 unsigned secFlg;
75 bool retry:1;
76 bool intr:1;
77 bool setuids:1;
78 bool override_uid:1;
79 bool override_gid:1;
80 bool dynperm:1;
81 bool noperm:1;
82 bool no_psx_acl:1; /* set if posix acl support should be disabled */
83 bool cifs_acl:1;
84 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
85 bool server_ino:1; /* use inode numbers from server ie UniqueId */
86 bool direct_io:1;
87 bool remap:1; /* set to remap seven reserved chars in filenames */
88 bool posix_paths:1; /* unset to not ask for posix pathnames. */
89 bool no_linux_ext:1;
90 bool sfu_emul:1;
91 bool nullauth:1; /* attempt to authenticate with null user */
92 bool nocase:1; /* request case insensitive filenames */
93 bool nobrl:1; /* disable sending byte range locks to srv */
94 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
95 bool seal:1; /* request transport encryption on share */
96 bool nodfs:1; /* Do not request DFS, even if available */
97 bool local_lease:1; /* check leases only on local system, not remote */
98 bool noblocksnd:1;
99 bool noautotune:1;
100 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
101 unsigned int rsize;
102 unsigned int wsize;
103 bool sockopt_tcp_nodelay:1;
104 unsigned short int port;
105 char *prepath;
106 struct nls_table *local_nls;
107 };
108
109 static int ipv4_connect(struct TCP_Server_Info *server);
110 static int ipv6_connect(struct TCP_Server_Info *server);
111
112 /*
113 * cifs tcp session reconnection
114 *
115 * mark tcp session as reconnecting so temporarily locked
116 * mark all smb sessions as reconnecting for tcp session
117 * reconnect tcp session
118 * wake up waiters on reconnection? - (not needed currently)
119 */
120 static int
121 cifs_reconnect(struct TCP_Server_Info *server)
122 {
123 int rc = 0;
124 struct list_head *tmp, *tmp2;
125 struct cifsSesInfo *ses;
126 struct cifsTconInfo *tcon;
127 struct mid_q_entry *mid_entry;
128
129 spin_lock(&GlobalMid_Lock);
130 if (server->tcpStatus == CifsExiting) {
131 /* the demux thread will exit normally
132 next time through the loop */
133 spin_unlock(&GlobalMid_Lock);
134 return rc;
135 } else
136 server->tcpStatus = CifsNeedReconnect;
137 spin_unlock(&GlobalMid_Lock);
138 server->maxBuf = 0;
139
140 cFYI(1, "Reconnecting tcp session");
141
142 /* before reconnecting the tcp session, mark the smb session (uid)
143 and the tid bad so they are not used until reconnected */
144 read_lock(&cifs_tcp_ses_lock);
145 list_for_each(tmp, &server->smb_ses_list) {
146 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
147 ses->need_reconnect = true;
148 ses->ipc_tid = 0;
149 list_for_each(tmp2, &ses->tcon_list) {
150 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
151 tcon->need_reconnect = true;
152 }
153 }
154 read_unlock(&cifs_tcp_ses_lock);
155 /* do not want to be sending data on a socket we are freeing */
156 mutex_lock(&server->srv_mutex);
157 if (server->ssocket) {
158 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
159 server->ssocket->flags);
160 kernel_sock_shutdown(server->ssocket, SHUT_WR);
161 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
162 server->ssocket->state,
163 server->ssocket->flags);
164 sock_release(server->ssocket);
165 server->ssocket = NULL;
166 }
167
168 spin_lock(&GlobalMid_Lock);
169 list_for_each(tmp, &server->pending_mid_q) {
170 mid_entry = list_entry(tmp, struct
171 mid_q_entry,
172 qhead);
173 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
174 /* Mark other intransit requests as needing
175 retry so we do not immediately mark the
176 session bad again (ie after we reconnect
177 below) as they timeout too */
178 mid_entry->midState = MID_RETRY_NEEDED;
179 }
180 }
181 spin_unlock(&GlobalMid_Lock);
182 mutex_unlock(&server->srv_mutex);
183
184 while ((server->tcpStatus != CifsExiting) &&
185 (server->tcpStatus != CifsGood)) {
186 try_to_freeze();
187 if (server->addr.sockAddr6.sin6_family == AF_INET6)
188 rc = ipv6_connect(server);
189 else
190 rc = ipv4_connect(server);
191 if (rc) {
192 cFYI(1, "reconnect error %d", rc);
193 msleep(3000);
194 } else {
195 atomic_inc(&tcpSesReconnectCount);
196 spin_lock(&GlobalMid_Lock);
197 if (server->tcpStatus != CifsExiting)
198 server->tcpStatus = CifsGood;
199 server->sequence_number = 0;
200 spin_unlock(&GlobalMid_Lock);
201 /* atomic_set(&server->inFlight,0);*/
202 wake_up(&server->response_q);
203 }
204 }
205 return rc;
206 }
207
208 /*
209 return codes:
210 0 not a transact2, or all data present
211 >0 transact2 with that much data missing
212 -EINVAL = invalid transact2
213
214 */
215 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
216 {
217 struct smb_t2_rsp *pSMBt;
218 int total_data_size;
219 int data_in_this_rsp;
220 int remaining;
221
222 if (pSMB->Command != SMB_COM_TRANSACTION2)
223 return 0;
224
225 /* check for plausible wct, bcc and t2 data and parm sizes */
226 /* check for parm and data offset going beyond end of smb */
227 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
228 cFYI(1, "invalid transact2 word count");
229 return -EINVAL;
230 }
231
232 pSMBt = (struct smb_t2_rsp *)pSMB;
233
234 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
235 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
236
237 remaining = total_data_size - data_in_this_rsp;
238
239 if (remaining == 0)
240 return 0;
241 else if (remaining < 0) {
242 cFYI(1, "total data %d smaller than data in frame %d",
243 total_data_size, data_in_this_rsp);
244 return -EINVAL;
245 } else {
246 cFYI(1, "missing %d bytes from transact2, check next response",
247 remaining);
248 if (total_data_size > maxBufSize) {
249 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
250 total_data_size, maxBufSize);
251 return -EINVAL;
252 }
253 return remaining;
254 }
255 }
256
257 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
258 {
259 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
260 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
261 int total_data_size;
262 int total_in_buf;
263 int remaining;
264 int total_in_buf2;
265 char *data_area_of_target;
266 char *data_area_of_buf2;
267 __u16 byte_count;
268
269 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
270
271 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
272 cFYI(1, "total data size of primary and secondary t2 differ");
273 }
274
275 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
276
277 remaining = total_data_size - total_in_buf;
278
279 if (remaining < 0)
280 return -EINVAL;
281
282 if (remaining == 0) /* nothing to do, ignore */
283 return 0;
284
285 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
286 if (remaining < total_in_buf2) {
287 cFYI(1, "transact2 2nd response contains too much data");
288 }
289
290 /* find end of first SMB data area */
291 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
292 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
293 /* validate target area */
294
295 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
296 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
297
298 data_area_of_target += total_in_buf;
299
300 /* copy second buffer into end of first buffer */
301 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
302 total_in_buf += total_in_buf2;
303 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
304 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
305 byte_count += total_in_buf2;
306 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
307
308 byte_count = pTargetSMB->smb_buf_length;
309 byte_count += total_in_buf2;
310
311 /* BB also add check that we are not beyond maximum buffer size */
312
313 pTargetSMB->smb_buf_length = byte_count;
314
315 if (remaining == total_in_buf2) {
316 cFYI(1, "found the last secondary response");
317 return 0; /* we are done */
318 } else /* more responses to go */
319 return 1;
320
321 }
322
323 static int
324 cifs_demultiplex_thread(struct TCP_Server_Info *server)
325 {
326 int length;
327 unsigned int pdu_length, total_read;
328 struct smb_hdr *smb_buffer = NULL;
329 struct smb_hdr *bigbuf = NULL;
330 struct smb_hdr *smallbuf = NULL;
331 struct msghdr smb_msg;
332 struct kvec iov;
333 struct socket *csocket = server->ssocket;
334 struct list_head *tmp;
335 struct cifsSesInfo *ses;
336 struct task_struct *task_to_wake = NULL;
337 struct mid_q_entry *mid_entry;
338 char temp;
339 bool isLargeBuf = false;
340 bool isMultiRsp;
341 int reconnect;
342
343 current->flags |= PF_MEMALLOC;
344 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
345
346 length = atomic_inc_return(&tcpSesAllocCount);
347 if (length > 1)
348 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
349 GFP_KERNEL);
350
351 set_freezable();
352 while (server->tcpStatus != CifsExiting) {
353 if (try_to_freeze())
354 continue;
355 if (bigbuf == NULL) {
356 bigbuf = cifs_buf_get();
357 if (!bigbuf) {
358 cERROR(1, "No memory for large SMB response");
359 msleep(3000);
360 /* retry will check if exiting */
361 continue;
362 }
363 } else if (isLargeBuf) {
364 /* we are reusing a dirty large buf, clear its start */
365 memset(bigbuf, 0, sizeof(struct smb_hdr));
366 }
367
368 if (smallbuf == NULL) {
369 smallbuf = cifs_small_buf_get();
370 if (!smallbuf) {
371 cERROR(1, "No memory for SMB response");
372 msleep(1000);
373 /* retry will check if exiting */
374 continue;
375 }
376 /* beginning of smb buffer is cleared in our buf_get */
377 } else /* if existing small buf clear beginning */
378 memset(smallbuf, 0, sizeof(struct smb_hdr));
379
380 isLargeBuf = false;
381 isMultiRsp = false;
382 smb_buffer = smallbuf;
383 iov.iov_base = smb_buffer;
384 iov.iov_len = 4;
385 smb_msg.msg_control = NULL;
386 smb_msg.msg_controllen = 0;
387 pdu_length = 4; /* enough to get RFC1001 header */
388 incomplete_rcv:
389 length =
390 kernel_recvmsg(csocket, &smb_msg,
391 &iov, 1, pdu_length, 0 /* BB other flags? */);
392
393 if (server->tcpStatus == CifsExiting) {
394 break;
395 } else if (server->tcpStatus == CifsNeedReconnect) {
396 cFYI(1, "Reconnect after server stopped responding");
397 cifs_reconnect(server);
398 cFYI(1, "call to reconnect done");
399 csocket = server->ssocket;
400 continue;
401 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
402 msleep(1); /* minimum sleep to prevent looping
403 allowing socket to clear and app threads to set
404 tcpStatus CifsNeedReconnect if server hung */
405 if (pdu_length < 4) {
406 iov.iov_base = (4 - pdu_length) +
407 (char *)smb_buffer;
408 iov.iov_len = pdu_length;
409 smb_msg.msg_control = NULL;
410 smb_msg.msg_controllen = 0;
411 goto incomplete_rcv;
412 } else
413 continue;
414 } else if (length <= 0) {
415 if (server->tcpStatus == CifsNew) {
416 cFYI(1, "tcp session abend after SMBnegprot");
417 /* some servers kill the TCP session rather than
418 returning an SMB negprot error, in which
419 case reconnecting here is not going to help,
420 and so simply return error to mount */
421 break;
422 }
423 if (!try_to_freeze() && (length == -EINTR)) {
424 cFYI(1, "cifsd thread killed");
425 break;
426 }
427 cFYI(1, "Reconnect after unexpected peek error %d",
428 length);
429 cifs_reconnect(server);
430 csocket = server->ssocket;
431 wake_up(&server->response_q);
432 continue;
433 } else if (length < pdu_length) {
434 cFYI(1, "requested %d bytes but only got %d bytes",
435 pdu_length, length);
436 pdu_length -= length;
437 msleep(1);
438 goto incomplete_rcv;
439 }
440
441 /* The right amount was read from socket - 4 bytes */
442 /* so we can now interpret the length field */
443
444 /* the first byte big endian of the length field,
445 is actually not part of the length but the type
446 with the most common, zero, as regular data */
447 temp = *((char *) smb_buffer);
448
449 /* Note that FC 1001 length is big endian on the wire,
450 but we convert it here so it is always manipulated
451 as host byte order */
452 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
453 smb_buffer->smb_buf_length = pdu_length;
454
455 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
456
457 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
458 continue;
459 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
460 cFYI(1, "Good RFC 1002 session rsp");
461 continue;
462 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
463 /* we get this from Windows 98 instead of
464 an error on SMB negprot response */
465 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
466 pdu_length);
467 if (server->tcpStatus == CifsNew) {
468 /* if nack on negprot (rather than
469 ret of smb negprot error) reconnecting
470 not going to help, ret error to mount */
471 break;
472 } else {
473 /* give server a second to
474 clean up before reconnect attempt */
475 msleep(1000);
476 /* always try 445 first on reconnect
477 since we get NACK on some if we ever
478 connected to port 139 (the NACK is
479 since we do not begin with RFC1001
480 session initialize frame) */
481 server->addr.sockAddr.sin_port =
482 htons(CIFS_PORT);
483 cifs_reconnect(server);
484 csocket = server->ssocket;
485 wake_up(&server->response_q);
486 continue;
487 }
488 } else if (temp != (char) 0) {
489 cERROR(1, "Unknown RFC 1002 frame");
490 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
491 length);
492 cifs_reconnect(server);
493 csocket = server->ssocket;
494 continue;
495 }
496
497 /* else we have an SMB response */
498 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
499 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
500 cERROR(1, "Invalid size SMB length %d pdu_length %d",
501 length, pdu_length+4);
502 cifs_reconnect(server);
503 csocket = server->ssocket;
504 wake_up(&server->response_q);
505 continue;
506 }
507
508 /* else length ok */
509 reconnect = 0;
510
511 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
512 isLargeBuf = true;
513 memcpy(bigbuf, smallbuf, 4);
514 smb_buffer = bigbuf;
515 }
516 length = 0;
517 iov.iov_base = 4 + (char *)smb_buffer;
518 iov.iov_len = pdu_length;
519 for (total_read = 0; total_read < pdu_length;
520 total_read += length) {
521 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
522 pdu_length - total_read, 0);
523 if ((server->tcpStatus == CifsExiting) ||
524 (length == -EINTR)) {
525 /* then will exit */
526 reconnect = 2;
527 break;
528 } else if (server->tcpStatus == CifsNeedReconnect) {
529 cifs_reconnect(server);
530 csocket = server->ssocket;
531 /* Reconnect wakes up rspns q */
532 /* Now we will reread sock */
533 reconnect = 1;
534 break;
535 } else if ((length == -ERESTARTSYS) ||
536 (length == -EAGAIN)) {
537 msleep(1); /* minimum sleep to prevent looping,
538 allowing socket to clear and app
539 threads to set tcpStatus
540 CifsNeedReconnect if server hung*/
541 length = 0;
542 continue;
543 } else if (length <= 0) {
544 cERROR(1, "Received no data, expecting %d",
545 pdu_length - total_read);
546 cifs_reconnect(server);
547 csocket = server->ssocket;
548 reconnect = 1;
549 break;
550 }
551 }
552 if (reconnect == 2)
553 break;
554 else if (reconnect == 1)
555 continue;
556
557 length += 4; /* account for rfc1002 hdr */
558
559
560 dump_smb(smb_buffer, length);
561 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
562 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
563 continue;
564 }
565
566
567 task_to_wake = NULL;
568 spin_lock(&GlobalMid_Lock);
569 list_for_each(tmp, &server->pending_mid_q) {
570 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
571
572 if ((mid_entry->mid == smb_buffer->Mid) &&
573 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
574 (mid_entry->command == smb_buffer->Command)) {
575 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
576 /* We have a multipart transact2 resp */
577 isMultiRsp = true;
578 if (mid_entry->resp_buf) {
579 /* merge response - fix up 1st*/
580 if (coalesce_t2(smb_buffer,
581 mid_entry->resp_buf)) {
582 mid_entry->multiRsp =
583 true;
584 break;
585 } else {
586 /* all parts received */
587 mid_entry->multiEnd =
588 true;
589 goto multi_t2_fnd;
590 }
591 } else {
592 if (!isLargeBuf) {
593 cERROR(1, "1st trans2 resp needs bigbuf");
594 /* BB maybe we can fix this up, switch
595 to already allocated large buffer? */
596 } else {
597 /* Have first buffer */
598 mid_entry->resp_buf =
599 smb_buffer;
600 mid_entry->largeBuf =
601 true;
602 bigbuf = NULL;
603 }
604 }
605 break;
606 }
607 mid_entry->resp_buf = smb_buffer;
608 mid_entry->largeBuf = isLargeBuf;
609 multi_t2_fnd:
610 task_to_wake = mid_entry->tsk;
611 mid_entry->midState = MID_RESPONSE_RECEIVED;
612 #ifdef CONFIG_CIFS_STATS2
613 mid_entry->when_received = jiffies;
614 #endif
615 /* so we do not time out requests to server
616 which is still responding (since server could
617 be busy but not dead) */
618 server->lstrp = jiffies;
619 break;
620 }
621 }
622 spin_unlock(&GlobalMid_Lock);
623 if (task_to_wake) {
624 /* Was previous buf put in mpx struct for multi-rsp? */
625 if (!isMultiRsp) {
626 /* smb buffer will be freed by user thread */
627 if (isLargeBuf)
628 bigbuf = NULL;
629 else
630 smallbuf = NULL;
631 }
632 wake_up_process(task_to_wake);
633 } else if (!is_valid_oplock_break(smb_buffer, server) &&
634 !isMultiRsp) {
635 cERROR(1, "No task to wake, unknown frame received! "
636 "NumMids %d", midCount.counter);
637 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
638 sizeof(struct smb_hdr));
639 #ifdef CONFIG_CIFS_DEBUG2
640 cifs_dump_detail(smb_buffer);
641 cifs_dump_mids(server);
642 #endif /* CIFS_DEBUG2 */
643
644 }
645 } /* end while !EXITING */
646
647 /* take it off the list, if it's not already */
648 write_lock(&cifs_tcp_ses_lock);
649 list_del_init(&server->tcp_ses_list);
650 write_unlock(&cifs_tcp_ses_lock);
651
652 spin_lock(&GlobalMid_Lock);
653 server->tcpStatus = CifsExiting;
654 spin_unlock(&GlobalMid_Lock);
655 wake_up_all(&server->response_q);
656
657 /* check if we have blocked requests that need to free */
658 /* Note that cifs_max_pending is normally 50, but
659 can be set at module install time to as little as two */
660 spin_lock(&GlobalMid_Lock);
661 if (atomic_read(&server->inFlight) >= cifs_max_pending)
662 atomic_set(&server->inFlight, cifs_max_pending - 1);
663 /* We do not want to set the max_pending too low or we
664 could end up with the counter going negative */
665 spin_unlock(&GlobalMid_Lock);
666 /* Although there should not be any requests blocked on
667 this queue it can not hurt to be paranoid and try to wake up requests
668 that may haven been blocked when more than 50 at time were on the wire
669 to the same server - they now will see the session is in exit state
670 and get out of SendReceive. */
671 wake_up_all(&server->request_q);
672 /* give those requests time to exit */
673 msleep(125);
674
675 if (server->ssocket) {
676 sock_release(csocket);
677 server->ssocket = NULL;
678 }
679 /* buffer usuallly freed in free_mid - need to free it here on exit */
680 cifs_buf_release(bigbuf);
681 if (smallbuf) /* no sense logging a debug message if NULL */
682 cifs_small_buf_release(smallbuf);
683
684 /*
685 * BB: we shouldn't have to do any of this. It shouldn't be
686 * possible to exit from the thread with active SMB sessions
687 */
688 read_lock(&cifs_tcp_ses_lock);
689 if (list_empty(&server->pending_mid_q)) {
690 /* loop through server session structures attached to this and
691 mark them dead */
692 list_for_each(tmp, &server->smb_ses_list) {
693 ses = list_entry(tmp, struct cifsSesInfo,
694 smb_ses_list);
695 ses->status = CifsExiting;
696 ses->server = NULL;
697 }
698 read_unlock(&cifs_tcp_ses_lock);
699 } else {
700 /* although we can not zero the server struct pointer yet,
701 since there are active requests which may depnd on them,
702 mark the corresponding SMB sessions as exiting too */
703 list_for_each(tmp, &server->smb_ses_list) {
704 ses = list_entry(tmp, struct cifsSesInfo,
705 smb_ses_list);
706 ses->status = CifsExiting;
707 }
708
709 spin_lock(&GlobalMid_Lock);
710 list_for_each(tmp, &server->pending_mid_q) {
711 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
712 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
713 cFYI(1, "Clearing Mid 0x%x - waking up ",
714 mid_entry->mid);
715 task_to_wake = mid_entry->tsk;
716 if (task_to_wake)
717 wake_up_process(task_to_wake);
718 }
719 }
720 spin_unlock(&GlobalMid_Lock);
721 read_unlock(&cifs_tcp_ses_lock);
722 /* 1/8th of sec is more than enough time for them to exit */
723 msleep(125);
724 }
725
726 if (!list_empty(&server->pending_mid_q)) {
727 /* mpx threads have not exited yet give them
728 at least the smb send timeout time for long ops */
729 /* due to delays on oplock break requests, we need
730 to wait at least 45 seconds before giving up
731 on a request getting a response and going ahead
732 and killing cifsd */
733 cFYI(1, "Wait for exit from demultiplex thread");
734 msleep(46000);
735 /* if threads still have not exited they are probably never
736 coming home not much else we can do but free the memory */
737 }
738
739 /* last chance to mark ses pointers invalid
740 if there are any pointing to this (e.g
741 if a crazy root user tried to kill cifsd
742 kernel thread explicitly this might happen) */
743 /* BB: This shouldn't be necessary, see above */
744 read_lock(&cifs_tcp_ses_lock);
745 list_for_each(tmp, &server->smb_ses_list) {
746 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
747 ses->server = NULL;
748 }
749 read_unlock(&cifs_tcp_ses_lock);
750
751 kfree(server->hostname);
752 task_to_wake = xchg(&server->tsk, NULL);
753 kfree(server);
754
755 length = atomic_dec_return(&tcpSesAllocCount);
756 if (length > 0)
757 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
758 GFP_KERNEL);
759
760 /* if server->tsk was NULL then wait for a signal before exiting */
761 if (!task_to_wake) {
762 set_current_state(TASK_INTERRUPTIBLE);
763 while (!signal_pending(current)) {
764 schedule();
765 set_current_state(TASK_INTERRUPTIBLE);
766 }
767 set_current_state(TASK_RUNNING);
768 }
769
770 module_put_and_exit(0);
771 }
772
773 /* extract the host portion of the UNC string */
774 static char *
775 extract_hostname(const char *unc)
776 {
777 const char *src;
778 char *dst, *delim;
779 unsigned int len;
780
781 /* skip double chars at beginning of string */
782 /* BB: check validity of these bytes? */
783 src = unc + 2;
784
785 /* delimiter between hostname and sharename is always '\\' now */
786 delim = strchr(src, '\\');
787 if (!delim)
788 return ERR_PTR(-EINVAL);
789
790 len = delim - src;
791 dst = kmalloc((len + 1), GFP_KERNEL);
792 if (dst == NULL)
793 return ERR_PTR(-ENOMEM);
794
795 memcpy(dst, src, len);
796 dst[len] = '\0';
797
798 return dst;
799 }
800
801 static int
802 cifs_parse_mount_options(char *options, const char *devname,
803 struct smb_vol *vol)
804 {
805 char *value;
806 char *data;
807 unsigned int temp_len, i, j;
808 char separator[2];
809 short int override_uid = -1;
810 short int override_gid = -1;
811 bool uid_specified = false;
812 bool gid_specified = false;
813
814 separator[0] = ',';
815 separator[1] = 0;
816
817 if (Local_System_Name[0] != 0)
818 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
819 else {
820 char *nodename = utsname()->nodename;
821 int n = strnlen(nodename, 15);
822 memset(vol->source_rfc1001_name, 0x20, 15);
823 for (i = 0; i < n; i++) {
824 /* does not have to be perfect mapping since field is
825 informational, only used for servers that do not support
826 port 445 and it can be overridden at mount time */
827 vol->source_rfc1001_name[i] = toupper(nodename[i]);
828 }
829 }
830 vol->source_rfc1001_name[15] = 0;
831 /* null target name indicates to use *SMBSERVR default called name
832 if we end up sending RFC1001 session initialize */
833 vol->target_rfc1001_name[0] = 0;
834 vol->linux_uid = current_uid(); /* use current_euid() instead? */
835 vol->linux_gid = current_gid();
836
837 /* default to only allowing write access to owner of the mount */
838 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
839
840 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
841 /* default is always to request posix paths. */
842 vol->posix_paths = 1;
843 /* default to using server inode numbers where available */
844 vol->server_ino = 1;
845
846 if (!options)
847 return 1;
848
849 if (strncmp(options, "sep=", 4) == 0) {
850 if (options[4] != 0) {
851 separator[0] = options[4];
852 options += 5;
853 } else {
854 cFYI(1, "Null separator not allowed");
855 }
856 }
857
858 while ((data = strsep(&options, separator)) != NULL) {
859 if (!*data)
860 continue;
861 if ((value = strchr(data, '=')) != NULL)
862 *value++ = '\0';
863
864 /* Have to parse this before we parse for "user" */
865 if (strnicmp(data, "user_xattr", 10) == 0) {
866 vol->no_xattr = 0;
867 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
868 vol->no_xattr = 1;
869 } else if (strnicmp(data, "user", 4) == 0) {
870 if (!value) {
871 printk(KERN_WARNING
872 "CIFS: invalid or missing username\n");
873 return 1; /* needs_arg; */
874 } else if (!*value) {
875 /* null user, ie anonymous, authentication */
876 vol->nullauth = 1;
877 }
878 if (strnlen(value, 200) < 200) {
879 vol->username = value;
880 } else {
881 printk(KERN_WARNING "CIFS: username too long\n");
882 return 1;
883 }
884 } else if (strnicmp(data, "pass", 4) == 0) {
885 if (!value) {
886 vol->password = NULL;
887 continue;
888 } else if (value[0] == 0) {
889 /* check if string begins with double comma
890 since that would mean the password really
891 does start with a comma, and would not
892 indicate an empty string */
893 if (value[1] != separator[0]) {
894 vol->password = NULL;
895 continue;
896 }
897 }
898 temp_len = strlen(value);
899 /* removed password length check, NTLM passwords
900 can be arbitrarily long */
901
902 /* if comma in password, the string will be
903 prematurely null terminated. Commas in password are
904 specified across the cifs mount interface by a double
905 comma ie ,, and a comma used as in other cases ie ','
906 as a parameter delimiter/separator is single and due
907 to the strsep above is temporarily zeroed. */
908
909 /* NB: password legally can have multiple commas and
910 the only illegal character in a password is null */
911
912 if ((value[temp_len] == 0) &&
913 (value[temp_len+1] == separator[0])) {
914 /* reinsert comma */
915 value[temp_len] = separator[0];
916 temp_len += 2; /* move after second comma */
917 while (value[temp_len] != 0) {
918 if (value[temp_len] == separator[0]) {
919 if (value[temp_len+1] ==
920 separator[0]) {
921 /* skip second comma */
922 temp_len++;
923 } else {
924 /* single comma indicating start
925 of next parm */
926 break;
927 }
928 }
929 temp_len++;
930 }
931 if (value[temp_len] == 0) {
932 options = NULL;
933 } else {
934 value[temp_len] = 0;
935 /* point option to start of next parm */
936 options = value + temp_len + 1;
937 }
938 /* go from value to value + temp_len condensing
939 double commas to singles. Note that this ends up
940 allocating a few bytes too many, which is ok */
941 vol->password = kzalloc(temp_len, GFP_KERNEL);
942 if (vol->password == NULL) {
943 printk(KERN_WARNING "CIFS: no memory "
944 "for password\n");
945 return 1;
946 }
947 for (i = 0, j = 0; i < temp_len; i++, j++) {
948 vol->password[j] = value[i];
949 if (value[i] == separator[0]
950 && value[i+1] == separator[0]) {
951 /* skip second comma */
952 i++;
953 }
954 }
955 vol->password[j] = 0;
956 } else {
957 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
958 if (vol->password == NULL) {
959 printk(KERN_WARNING "CIFS: no memory "
960 "for password\n");
961 return 1;
962 }
963 strcpy(vol->password, value);
964 }
965 } else if (!strnicmp(data, "ip", 2) ||
966 !strnicmp(data, "addr", 4)) {
967 if (!value || !*value) {
968 vol->UNCip = NULL;
969 } else if (strnlen(value, INET6_ADDRSTRLEN) <
970 INET6_ADDRSTRLEN) {
971 vol->UNCip = value;
972 } else {
973 printk(KERN_WARNING "CIFS: ip address "
974 "too long\n");
975 return 1;
976 }
977 } else if (strnicmp(data, "sec", 3) == 0) {
978 if (!value || !*value) {
979 cERROR(1, "no security value specified");
980 continue;
981 } else if (strnicmp(value, "krb5i", 5) == 0) {
982 vol->secFlg |= CIFSSEC_MAY_KRB5 |
983 CIFSSEC_MUST_SIGN;
984 } else if (strnicmp(value, "krb5p", 5) == 0) {
985 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
986 CIFSSEC_MAY_KRB5; */
987 cERROR(1, "Krb5 cifs privacy not supported");
988 return 1;
989 } else if (strnicmp(value, "krb5", 4) == 0) {
990 vol->secFlg |= CIFSSEC_MAY_KRB5;
991 #ifdef CONFIG_CIFS_EXPERIMENTAL
992 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
993 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
994 CIFSSEC_MUST_SIGN;
995 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
996 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
997 #endif
998 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1000 CIFSSEC_MUST_SIGN;
1001 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1002 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1003 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1004 vol->secFlg |= CIFSSEC_MAY_NTLM |
1005 CIFSSEC_MUST_SIGN;
1006 } else if (strnicmp(value, "ntlm", 4) == 0) {
1007 /* ntlm is default so can be turned off too */
1008 vol->secFlg |= CIFSSEC_MAY_NTLM;
1009 } else if (strnicmp(value, "nontlm", 6) == 0) {
1010 /* BB is there a better way to do this? */
1011 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1012 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1013 } else if (strnicmp(value, "lanman", 6) == 0) {
1014 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1015 #endif
1016 } else if (strnicmp(value, "none", 4) == 0) {
1017 vol->nullauth = 1;
1018 } else {
1019 cERROR(1, "bad security option: %s", value);
1020 return 1;
1021 }
1022 } else if ((strnicmp(data, "unc", 3) == 0)
1023 || (strnicmp(data, "target", 6) == 0)
1024 || (strnicmp(data, "path", 4) == 0)) {
1025 if (!value || !*value) {
1026 printk(KERN_WARNING "CIFS: invalid path to "
1027 "network resource\n");
1028 return 1; /* needs_arg; */
1029 }
1030 if ((temp_len = strnlen(value, 300)) < 300) {
1031 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1032 if (vol->UNC == NULL)
1033 return 1;
1034 strcpy(vol->UNC, value);
1035 if (strncmp(vol->UNC, "//", 2) == 0) {
1036 vol->UNC[0] = '\\';
1037 vol->UNC[1] = '\\';
1038 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1039 printk(KERN_WARNING
1040 "CIFS: UNC Path does not begin "
1041 "with // or \\\\ \n");
1042 return 1;
1043 }
1044 } else {
1045 printk(KERN_WARNING "CIFS: UNC name too long\n");
1046 return 1;
1047 }
1048 } else if ((strnicmp(data, "domain", 3) == 0)
1049 || (strnicmp(data, "workgroup", 5) == 0)) {
1050 if (!value || !*value) {
1051 printk(KERN_WARNING "CIFS: invalid domain name\n");
1052 return 1; /* needs_arg; */
1053 }
1054 /* BB are there cases in which a comma can be valid in
1055 a domain name and need special handling? */
1056 if (strnlen(value, 256) < 256) {
1057 vol->domainname = value;
1058 cFYI(1, "Domain name set");
1059 } else {
1060 printk(KERN_WARNING "CIFS: domain name too "
1061 "long\n");
1062 return 1;
1063 }
1064 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1065 if (!value || !*value) {
1066 printk(KERN_WARNING
1067 "CIFS: invalid path prefix\n");
1068 return 1; /* needs_argument */
1069 }
1070 if ((temp_len = strnlen(value, 1024)) < 1024) {
1071 if (value[0] != '/')
1072 temp_len++; /* missing leading slash */
1073 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1074 if (vol->prepath == NULL)
1075 return 1;
1076 if (value[0] != '/') {
1077 vol->prepath[0] = '/';
1078 strcpy(vol->prepath+1, value);
1079 } else
1080 strcpy(vol->prepath, value);
1081 cFYI(1, "prefix path %s", vol->prepath);
1082 } else {
1083 printk(KERN_WARNING "CIFS: prefix too long\n");
1084 return 1;
1085 }
1086 } else if (strnicmp(data, "iocharset", 9) == 0) {
1087 if (!value || !*value) {
1088 printk(KERN_WARNING "CIFS: invalid iocharset "
1089 "specified\n");
1090 return 1; /* needs_arg; */
1091 }
1092 if (strnlen(value, 65) < 65) {
1093 if (strnicmp(value, "default", 7))
1094 vol->iocharset = value;
1095 /* if iocharset not set then load_nls_default
1096 is used by caller */
1097 cFYI(1, "iocharset set to %s", value);
1098 } else {
1099 printk(KERN_WARNING "CIFS: iocharset name "
1100 "too long.\n");
1101 return 1;
1102 }
1103 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1104 vol->linux_uid = simple_strtoul(value, &value, 0);
1105 uid_specified = true;
1106 } else if (!strnicmp(data, "forceuid", 8)) {
1107 override_uid = 1;
1108 } else if (!strnicmp(data, "noforceuid", 10)) {
1109 override_uid = 0;
1110 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1111 vol->linux_gid = simple_strtoul(value, &value, 0);
1112 gid_specified = true;
1113 } else if (!strnicmp(data, "forcegid", 8)) {
1114 override_gid = 1;
1115 } else if (!strnicmp(data, "noforcegid", 10)) {
1116 override_gid = 0;
1117 } else if (strnicmp(data, "file_mode", 4) == 0) {
1118 if (value && *value) {
1119 vol->file_mode =
1120 simple_strtoul(value, &value, 0);
1121 }
1122 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1123 if (value && *value) {
1124 vol->dir_mode =
1125 simple_strtoul(value, &value, 0);
1126 }
1127 } else if (strnicmp(data, "dirmode", 4) == 0) {
1128 if (value && *value) {
1129 vol->dir_mode =
1130 simple_strtoul(value, &value, 0);
1131 }
1132 } else if (strnicmp(data, "port", 4) == 0) {
1133 if (value && *value) {
1134 vol->port =
1135 simple_strtoul(value, &value, 0);
1136 }
1137 } else if (strnicmp(data, "rsize", 5) == 0) {
1138 if (value && *value) {
1139 vol->rsize =
1140 simple_strtoul(value, &value, 0);
1141 }
1142 } else if (strnicmp(data, "wsize", 5) == 0) {
1143 if (value && *value) {
1144 vol->wsize =
1145 simple_strtoul(value, &value, 0);
1146 }
1147 } else if (strnicmp(data, "sockopt", 5) == 0) {
1148 if (!value || !*value) {
1149 cERROR(1, "no socket option specified");
1150 continue;
1151 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1152 vol->sockopt_tcp_nodelay = 1;
1153 }
1154 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1155 if (!value || !*value || (*value == ' ')) {
1156 cFYI(1, "invalid (empty) netbiosname");
1157 } else {
1158 memset(vol->source_rfc1001_name, 0x20, 15);
1159 for (i = 0; i < 15; i++) {
1160 /* BB are there cases in which a comma can be
1161 valid in this workstation netbios name (and need
1162 special handling)? */
1163
1164 /* We do not uppercase netbiosname for user */
1165 if (value[i] == 0)
1166 break;
1167 else
1168 vol->source_rfc1001_name[i] =
1169 value[i];
1170 }
1171 /* The string has 16th byte zero still from
1172 set at top of the function */
1173 if ((i == 15) && (value[i] != 0))
1174 printk(KERN_WARNING "CIFS: netbiosname"
1175 " longer than 15 truncated.\n");
1176 }
1177 } else if (strnicmp(data, "servern", 7) == 0) {
1178 /* servernetbiosname specified override *SMBSERVER */
1179 if (!value || !*value || (*value == ' ')) {
1180 cFYI(1, "empty server netbiosname specified");
1181 } else {
1182 /* last byte, type, is 0x20 for servr type */
1183 memset(vol->target_rfc1001_name, 0x20, 16);
1184
1185 for (i = 0; i < 15; i++) {
1186 /* BB are there cases in which a comma can be
1187 valid in this workstation netbios name
1188 (and need special handling)? */
1189
1190 /* user or mount helper must uppercase
1191 the netbiosname */
1192 if (value[i] == 0)
1193 break;
1194 else
1195 vol->target_rfc1001_name[i] =
1196 value[i];
1197 }
1198 /* The string has 16th byte zero still from
1199 set at top of the function */
1200 if ((i == 15) && (value[i] != 0))
1201 printk(KERN_WARNING "CIFS: server net"
1202 "biosname longer than 15 truncated.\n");
1203 }
1204 } else if (strnicmp(data, "credentials", 4) == 0) {
1205 /* ignore */
1206 } else if (strnicmp(data, "version", 3) == 0) {
1207 /* ignore */
1208 } else if (strnicmp(data, "guest", 5) == 0) {
1209 /* ignore */
1210 } else if (strnicmp(data, "rw", 2) == 0) {
1211 /* ignore */
1212 } else if (strnicmp(data, "ro", 2) == 0) {
1213 /* ignore */
1214 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1215 vol->noblocksnd = 1;
1216 } else if (strnicmp(data, "noautotune", 10) == 0) {
1217 vol->noautotune = 1;
1218 } else if ((strnicmp(data, "suid", 4) == 0) ||
1219 (strnicmp(data, "nosuid", 6) == 0) ||
1220 (strnicmp(data, "exec", 4) == 0) ||
1221 (strnicmp(data, "noexec", 6) == 0) ||
1222 (strnicmp(data, "nodev", 5) == 0) ||
1223 (strnicmp(data, "noauto", 6) == 0) ||
1224 (strnicmp(data, "dev", 3) == 0)) {
1225 /* The mount tool or mount.cifs helper (if present)
1226 uses these opts to set flags, and the flags are read
1227 by the kernel vfs layer before we get here (ie
1228 before read super) so there is no point trying to
1229 parse these options again and set anything and it
1230 is ok to just ignore them */
1231 continue;
1232 } else if (strnicmp(data, "hard", 4) == 0) {
1233 vol->retry = 1;
1234 } else if (strnicmp(data, "soft", 4) == 0) {
1235 vol->retry = 0;
1236 } else if (strnicmp(data, "perm", 4) == 0) {
1237 vol->noperm = 0;
1238 } else if (strnicmp(data, "noperm", 6) == 0) {
1239 vol->noperm = 1;
1240 } else if (strnicmp(data, "mapchars", 8) == 0) {
1241 vol->remap = 1;
1242 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1243 vol->remap = 0;
1244 } else if (strnicmp(data, "sfu", 3) == 0) {
1245 vol->sfu_emul = 1;
1246 } else if (strnicmp(data, "nosfu", 5) == 0) {
1247 vol->sfu_emul = 0;
1248 } else if (strnicmp(data, "nodfs", 5) == 0) {
1249 vol->nodfs = 1;
1250 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1251 vol->posix_paths = 1;
1252 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1253 vol->posix_paths = 0;
1254 } else if (strnicmp(data, "nounix", 6) == 0) {
1255 vol->no_linux_ext = 1;
1256 } else if (strnicmp(data, "nolinux", 7) == 0) {
1257 vol->no_linux_ext = 1;
1258 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1259 (strnicmp(data, "ignorecase", 10) == 0)) {
1260 vol->nocase = 1;
1261 } else if (strnicmp(data, "brl", 3) == 0) {
1262 vol->nobrl = 0;
1263 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1264 (strnicmp(data, "nolock", 6) == 0)) {
1265 vol->nobrl = 1;
1266 /* turn off mandatory locking in mode
1267 if remote locking is turned off since the
1268 local vfs will do advisory */
1269 if (vol->file_mode ==
1270 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1271 vol->file_mode = S_IALLUGO;
1272 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1273 /* will take the shorter form "forcemand" as well */
1274 /* This mount option will force use of mandatory
1275 (DOS/Windows style) byte range locks, instead of
1276 using posix advisory byte range locks, even if the
1277 Unix extensions are available and posix locks would
1278 be supported otherwise. If Unix extensions are not
1279 negotiated this has no effect since mandatory locks
1280 would be used (mandatory locks is all that those
1281 those servers support) */
1282 vol->mand_lock = 1;
1283 } else if (strnicmp(data, "setuids", 7) == 0) {
1284 vol->setuids = 1;
1285 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1286 vol->setuids = 0;
1287 } else if (strnicmp(data, "dynperm", 7) == 0) {
1288 vol->dynperm = true;
1289 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1290 vol->dynperm = false;
1291 } else if (strnicmp(data, "nohard", 6) == 0) {
1292 vol->retry = 0;
1293 } else if (strnicmp(data, "nosoft", 6) == 0) {
1294 vol->retry = 1;
1295 } else if (strnicmp(data, "nointr", 6) == 0) {
1296 vol->intr = 0;
1297 } else if (strnicmp(data, "intr", 4) == 0) {
1298 vol->intr = 1;
1299 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1300 vol->nostrictsync = 1;
1301 } else if (strnicmp(data, "strictsync", 10) == 0) {
1302 vol->nostrictsync = 0;
1303 } else if (strnicmp(data, "serverino", 7) == 0) {
1304 vol->server_ino = 1;
1305 } else if (strnicmp(data, "noserverino", 9) == 0) {
1306 vol->server_ino = 0;
1307 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1308 vol->cifs_acl = 1;
1309 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1310 vol->cifs_acl = 0;
1311 } else if (strnicmp(data, "acl", 3) == 0) {
1312 vol->no_psx_acl = 0;
1313 } else if (strnicmp(data, "noacl", 5) == 0) {
1314 vol->no_psx_acl = 1;
1315 #ifdef CONFIG_CIFS_EXPERIMENTAL
1316 } else if (strnicmp(data, "locallease", 6) == 0) {
1317 vol->local_lease = 1;
1318 #endif
1319 } else if (strnicmp(data, "sign", 4) == 0) {
1320 vol->secFlg |= CIFSSEC_MUST_SIGN;
1321 } else if (strnicmp(data, "seal", 4) == 0) {
1322 /* we do not do the following in secFlags because seal
1323 is a per tree connection (mount) not a per socket
1324 or per-smb connection option in the protocol */
1325 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1326 vol->seal = 1;
1327 } else if (strnicmp(data, "direct", 6) == 0) {
1328 vol->direct_io = 1;
1329 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1330 vol->direct_io = 1;
1331 } else if (strnicmp(data, "noac", 4) == 0) {
1332 printk(KERN_WARNING "CIFS: Mount option noac not "
1333 "supported. Instead set "
1334 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1335 } else
1336 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1337 data);
1338 }
1339 if (vol->UNC == NULL) {
1340 if (devname == NULL) {
1341 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1342 "target\n");
1343 return 1;
1344 }
1345 if ((temp_len = strnlen(devname, 300)) < 300) {
1346 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1347 if (vol->UNC == NULL)
1348 return 1;
1349 strcpy(vol->UNC, devname);
1350 if (strncmp(vol->UNC, "//", 2) == 0) {
1351 vol->UNC[0] = '\\';
1352 vol->UNC[1] = '\\';
1353 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1354 printk(KERN_WARNING "CIFS: UNC Path does not "
1355 "begin with // or \\\\ \n");
1356 return 1;
1357 }
1358 value = strpbrk(vol->UNC+2, "/\\");
1359 if (value)
1360 *value = '\\';
1361 } else {
1362 printk(KERN_WARNING "CIFS: UNC name too long\n");
1363 return 1;
1364 }
1365 }
1366 if (vol->UNCip == NULL)
1367 vol->UNCip = &vol->UNC[2];
1368
1369 if (uid_specified)
1370 vol->override_uid = override_uid;
1371 else if (override_uid == 1)
1372 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1373 "specified with no uid= option.\n");
1374
1375 if (gid_specified)
1376 vol->override_gid = override_gid;
1377 else if (override_gid == 1)
1378 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1379 "specified with no gid= option.\n");
1380
1381 return 0;
1382 }
1383
1384 static bool
1385 match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1386 {
1387 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1388 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1389
1390 switch (addr->sa_family) {
1391 case AF_INET:
1392 if (addr4->sin_addr.s_addr !=
1393 server->addr.sockAddr.sin_addr.s_addr)
1394 return false;
1395 if (addr4->sin_port &&
1396 addr4->sin_port != server->addr.sockAddr.sin_port)
1397 return false;
1398 break;
1399 case AF_INET6:
1400 if (!ipv6_addr_equal(&addr6->sin6_addr,
1401 &server->addr.sockAddr6.sin6_addr))
1402 return false;
1403 if (addr6->sin6_scope_id !=
1404 server->addr.sockAddr6.sin6_scope_id)
1405 return false;
1406 if (addr6->sin6_port &&
1407 addr6->sin6_port != server->addr.sockAddr6.sin6_port)
1408 return false;
1409 break;
1410 }
1411
1412 return true;
1413 }
1414
1415 static struct TCP_Server_Info *
1416 cifs_find_tcp_session(struct sockaddr *addr)
1417 {
1418 struct TCP_Server_Info *server;
1419
1420 write_lock(&cifs_tcp_ses_lock);
1421 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1422 /*
1423 * the demux thread can exit on its own while still in CifsNew
1424 * so don't accept any sockets in that state. Since the
1425 * tcpStatus never changes back to CifsNew it's safe to check
1426 * for this without a lock.
1427 */
1428 if (server->tcpStatus == CifsNew)
1429 continue;
1430
1431 if (!match_address(server, addr))
1432 continue;
1433
1434 ++server->srv_count;
1435 write_unlock(&cifs_tcp_ses_lock);
1436 cFYI(1, "Existing tcp session with server found");
1437 return server;
1438 }
1439 write_unlock(&cifs_tcp_ses_lock);
1440 return NULL;
1441 }
1442
1443 static void
1444 cifs_put_tcp_session(struct TCP_Server_Info *server)
1445 {
1446 struct task_struct *task;
1447
1448 write_lock(&cifs_tcp_ses_lock);
1449 if (--server->srv_count > 0) {
1450 write_unlock(&cifs_tcp_ses_lock);
1451 return;
1452 }
1453
1454 list_del_init(&server->tcp_ses_list);
1455 write_unlock(&cifs_tcp_ses_lock);
1456
1457 spin_lock(&GlobalMid_Lock);
1458 server->tcpStatus = CifsExiting;
1459 spin_unlock(&GlobalMid_Lock);
1460
1461 cifs_fscache_release_client_cookie(server);
1462
1463 task = xchg(&server->tsk, NULL);
1464 if (task)
1465 force_sig(SIGKILL, task);
1466 }
1467
1468 static struct TCP_Server_Info *
1469 cifs_get_tcp_session(struct smb_vol *volume_info)
1470 {
1471 struct TCP_Server_Info *tcp_ses = NULL;
1472 struct sockaddr_storage addr;
1473 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1474 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1475 int rc;
1476
1477 memset(&addr, 0, sizeof(struct sockaddr_storage));
1478
1479 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1480
1481 if (volume_info->UNCip && volume_info->UNC) {
1482 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1483 volume_info->UNCip,
1484 volume_info->port);
1485 if (!rc) {
1486 /* we failed translating address */
1487 rc = -EINVAL;
1488 goto out_err;
1489 }
1490 } else if (volume_info->UNCip) {
1491 /* BB using ip addr as tcp_ses name to connect to the
1492 DFS root below */
1493 cERROR(1, "Connecting to DFS root not implemented yet");
1494 rc = -EINVAL;
1495 goto out_err;
1496 } else /* which tcp_sess DFS root would we conect to */ {
1497 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1498 "unc=//192.168.1.100/public) specified");
1499 rc = -EINVAL;
1500 goto out_err;
1501 }
1502
1503 /* see if we already have a matching tcp_ses */
1504 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr);
1505 if (tcp_ses)
1506 return tcp_ses;
1507
1508 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1509 if (!tcp_ses) {
1510 rc = -ENOMEM;
1511 goto out_err;
1512 }
1513
1514 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1515 if (IS_ERR(tcp_ses->hostname)) {
1516 rc = PTR_ERR(tcp_ses->hostname);
1517 goto out_err;
1518 }
1519
1520 tcp_ses->noblocksnd = volume_info->noblocksnd;
1521 tcp_ses->noautotune = volume_info->noautotune;
1522 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1523 atomic_set(&tcp_ses->inFlight, 0);
1524 init_waitqueue_head(&tcp_ses->response_q);
1525 init_waitqueue_head(&tcp_ses->request_q);
1526 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1527 mutex_init(&tcp_ses->srv_mutex);
1528 memcpy(tcp_ses->workstation_RFC1001_name,
1529 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1530 memcpy(tcp_ses->server_RFC1001_name,
1531 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1532 tcp_ses->sequence_number = 0;
1533 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1534 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1535
1536 /*
1537 * at this point we are the only ones with the pointer
1538 * to the struct since the kernel thread not created yet
1539 * no need to spinlock this init of tcpStatus or srv_count
1540 */
1541 tcp_ses->tcpStatus = CifsNew;
1542 ++tcp_ses->srv_count;
1543
1544 if (addr.ss_family == AF_INET6) {
1545 cFYI(1, "attempting ipv6 connect");
1546 /* BB should we allow ipv6 on port 139? */
1547 /* other OS never observed in Wild doing 139 with v6 */
1548 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1549 sizeof(struct sockaddr_in6));
1550 rc = ipv6_connect(tcp_ses);
1551 } else {
1552 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1553 sizeof(struct sockaddr_in));
1554 rc = ipv4_connect(tcp_ses);
1555 }
1556 if (rc < 0) {
1557 cERROR(1, "Error connecting to socket. Aborting operation");
1558 goto out_err;
1559 }
1560
1561 /*
1562 * since we're in a cifs function already, we know that
1563 * this will succeed. No need for try_module_get().
1564 */
1565 __module_get(THIS_MODULE);
1566 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1567 tcp_ses, "cifsd");
1568 if (IS_ERR(tcp_ses->tsk)) {
1569 rc = PTR_ERR(tcp_ses->tsk);
1570 cERROR(1, "error %d create cifsd thread", rc);
1571 module_put(THIS_MODULE);
1572 goto out_err;
1573 }
1574
1575 /* thread spawned, put it on the list */
1576 write_lock(&cifs_tcp_ses_lock);
1577 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1578 write_unlock(&cifs_tcp_ses_lock);
1579
1580 cifs_fscache_get_client_cookie(tcp_ses);
1581
1582 return tcp_ses;
1583
1584 out_err:
1585 if (tcp_ses) {
1586 if (!IS_ERR(tcp_ses->hostname))
1587 kfree(tcp_ses->hostname);
1588 if (tcp_ses->ssocket)
1589 sock_release(tcp_ses->ssocket);
1590 kfree(tcp_ses);
1591 }
1592 return ERR_PTR(rc);
1593 }
1594
1595 static struct cifsSesInfo *
1596 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1597 {
1598 struct list_head *tmp;
1599 struct cifsSesInfo *ses;
1600
1601 write_lock(&cifs_tcp_ses_lock);
1602 list_for_each(tmp, &server->smb_ses_list) {
1603 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1604 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1605 continue;
1606
1607 ++ses->ses_count;
1608 write_unlock(&cifs_tcp_ses_lock);
1609 return ses;
1610 }
1611 write_unlock(&cifs_tcp_ses_lock);
1612 return NULL;
1613 }
1614
1615 static void
1616 cifs_put_smb_ses(struct cifsSesInfo *ses)
1617 {
1618 int xid;
1619 struct TCP_Server_Info *server = ses->server;
1620
1621 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1622 write_lock(&cifs_tcp_ses_lock);
1623 if (--ses->ses_count > 0) {
1624 write_unlock(&cifs_tcp_ses_lock);
1625 return;
1626 }
1627
1628 list_del_init(&ses->smb_ses_list);
1629 write_unlock(&cifs_tcp_ses_lock);
1630
1631 if (ses->status == CifsGood) {
1632 xid = GetXid();
1633 CIFSSMBLogoff(xid, ses);
1634 _FreeXid(xid);
1635 }
1636 sesInfoFree(ses);
1637 cifs_put_tcp_session(server);
1638 }
1639
1640 static struct cifsSesInfo *
1641 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1642 {
1643 int rc = -ENOMEM, xid;
1644 struct cifsSesInfo *ses;
1645
1646 xid = GetXid();
1647
1648 ses = cifs_find_smb_ses(server, volume_info->username);
1649 if (ses) {
1650 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1651
1652 /* existing SMB ses has a server reference already */
1653 cifs_put_tcp_session(server);
1654
1655 mutex_lock(&ses->session_mutex);
1656 rc = cifs_negotiate_protocol(xid, ses);
1657 if (rc) {
1658 mutex_unlock(&ses->session_mutex);
1659 /* problem -- put our ses reference */
1660 cifs_put_smb_ses(ses);
1661 FreeXid(xid);
1662 return ERR_PTR(rc);
1663 }
1664 if (ses->need_reconnect) {
1665 cFYI(1, "Session needs reconnect");
1666 rc = cifs_setup_session(xid, ses,
1667 volume_info->local_nls);
1668 if (rc) {
1669 mutex_unlock(&ses->session_mutex);
1670 /* problem -- put our reference */
1671 cifs_put_smb_ses(ses);
1672 FreeXid(xid);
1673 return ERR_PTR(rc);
1674 }
1675 }
1676 mutex_unlock(&ses->session_mutex);
1677 FreeXid(xid);
1678 return ses;
1679 }
1680
1681 cFYI(1, "Existing smb sess not found");
1682 ses = sesInfoAlloc();
1683 if (ses == NULL)
1684 goto get_ses_fail;
1685
1686 /* new SMB session uses our server ref */
1687 ses->server = server;
1688 if (server->addr.sockAddr6.sin6_family == AF_INET6)
1689 sprintf(ses->serverName, "%pI6",
1690 &server->addr.sockAddr6.sin6_addr);
1691 else
1692 sprintf(ses->serverName, "%pI4",
1693 &server->addr.sockAddr.sin_addr.s_addr);
1694
1695 if (volume_info->username)
1696 strncpy(ses->userName, volume_info->username,
1697 MAX_USERNAME_SIZE);
1698
1699 /* volume_info->password freed at unmount */
1700 if (volume_info->password) {
1701 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1702 if (!ses->password)
1703 goto get_ses_fail;
1704 }
1705 if (volume_info->domainname) {
1706 int len = strlen(volume_info->domainname);
1707 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1708 if (ses->domainName)
1709 strcpy(ses->domainName, volume_info->domainname);
1710 }
1711 ses->linux_uid = volume_info->linux_uid;
1712 ses->overrideSecFlg = volume_info->secFlg;
1713
1714 mutex_lock(&ses->session_mutex);
1715 rc = cifs_negotiate_protocol(xid, ses);
1716 if (!rc)
1717 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1718 mutex_unlock(&ses->session_mutex);
1719 if (rc)
1720 goto get_ses_fail;
1721
1722 /* success, put it on the list */
1723 write_lock(&cifs_tcp_ses_lock);
1724 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1725 write_unlock(&cifs_tcp_ses_lock);
1726
1727 FreeXid(xid);
1728 return ses;
1729
1730 get_ses_fail:
1731 sesInfoFree(ses);
1732 FreeXid(xid);
1733 return ERR_PTR(rc);
1734 }
1735
1736 static struct cifsTconInfo *
1737 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1738 {
1739 struct list_head *tmp;
1740 struct cifsTconInfo *tcon;
1741
1742 write_lock(&cifs_tcp_ses_lock);
1743 list_for_each(tmp, &ses->tcon_list) {
1744 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1745 if (tcon->tidStatus == CifsExiting)
1746 continue;
1747 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1748 continue;
1749
1750 ++tcon->tc_count;
1751 write_unlock(&cifs_tcp_ses_lock);
1752 return tcon;
1753 }
1754 write_unlock(&cifs_tcp_ses_lock);
1755 return NULL;
1756 }
1757
1758 static void
1759 cifs_put_tcon(struct cifsTconInfo *tcon)
1760 {
1761 int xid;
1762 struct cifsSesInfo *ses = tcon->ses;
1763
1764 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1765 write_lock(&cifs_tcp_ses_lock);
1766 if (--tcon->tc_count > 0) {
1767 write_unlock(&cifs_tcp_ses_lock);
1768 return;
1769 }
1770
1771 list_del_init(&tcon->tcon_list);
1772 write_unlock(&cifs_tcp_ses_lock);
1773
1774 xid = GetXid();
1775 CIFSSMBTDis(xid, tcon);
1776 _FreeXid(xid);
1777
1778 tconInfoFree(tcon);
1779 cifs_put_smb_ses(ses);
1780 }
1781
1782 static struct cifsTconInfo *
1783 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1784 {
1785 int rc, xid;
1786 struct cifsTconInfo *tcon;
1787
1788 tcon = cifs_find_tcon(ses, volume_info->UNC);
1789 if (tcon) {
1790 cFYI(1, "Found match on UNC path");
1791 /* existing tcon already has a reference */
1792 cifs_put_smb_ses(ses);
1793 if (tcon->seal != volume_info->seal)
1794 cERROR(1, "transport encryption setting "
1795 "conflicts with existing tid");
1796 return tcon;
1797 }
1798
1799 tcon = tconInfoAlloc();
1800 if (tcon == NULL) {
1801 rc = -ENOMEM;
1802 goto out_fail;
1803 }
1804
1805 tcon->ses = ses;
1806 if (volume_info->password) {
1807 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1808 if (!tcon->password) {
1809 rc = -ENOMEM;
1810 goto out_fail;
1811 }
1812 }
1813
1814 if (strchr(volume_info->UNC + 3, '\\') == NULL
1815 && strchr(volume_info->UNC + 3, '/') == NULL) {
1816 cERROR(1, "Missing share name");
1817 rc = -ENODEV;
1818 goto out_fail;
1819 }
1820
1821 /* BB Do we need to wrap session_mutex around
1822 * this TCon call and Unix SetFS as
1823 * we do on SessSetup and reconnect? */
1824 xid = GetXid();
1825 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1826 FreeXid(xid);
1827 cFYI(1, "CIFS Tcon rc = %d", rc);
1828 if (rc)
1829 goto out_fail;
1830
1831 if (volume_info->nodfs) {
1832 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1833 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1834 }
1835 tcon->seal = volume_info->seal;
1836 /* we can have only one retry value for a connection
1837 to a share so for resources mounted more than once
1838 to the same server share the last value passed in
1839 for the retry flag is used */
1840 tcon->retry = volume_info->retry;
1841 tcon->nocase = volume_info->nocase;
1842 tcon->local_lease = volume_info->local_lease;
1843
1844 write_lock(&cifs_tcp_ses_lock);
1845 list_add(&tcon->tcon_list, &ses->tcon_list);
1846 write_unlock(&cifs_tcp_ses_lock);
1847
1848 return tcon;
1849
1850 out_fail:
1851 tconInfoFree(tcon);
1852 return ERR_PTR(rc);
1853 }
1854
1855
1856 int
1857 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1858 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1859 struct dfs_info3_param **preferrals, int remap)
1860 {
1861 char *temp_unc;
1862 int rc = 0;
1863
1864 *pnum_referrals = 0;
1865 *preferrals = NULL;
1866
1867 if (pSesInfo->ipc_tid == 0) {
1868 temp_unc = kmalloc(2 /* for slashes */ +
1869 strnlen(pSesInfo->serverName,
1870 SERVER_NAME_LEN_WITH_NULL * 2)
1871 + 1 + 4 /* slash IPC$ */ + 2,
1872 GFP_KERNEL);
1873 if (temp_unc == NULL)
1874 return -ENOMEM;
1875 temp_unc[0] = '\\';
1876 temp_unc[1] = '\\';
1877 strcpy(temp_unc + 2, pSesInfo->serverName);
1878 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1879 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1880 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1881 kfree(temp_unc);
1882 }
1883 if (rc == 0)
1884 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1885 pnum_referrals, nls_codepage, remap);
1886 /* BB map targetUNCs to dfs_info3 structures, here or
1887 in CIFSGetDFSRefer BB */
1888
1889 return rc;
1890 }
1891
1892 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1893 static struct lock_class_key cifs_key[2];
1894 static struct lock_class_key cifs_slock_key[2];
1895
1896 static inline void
1897 cifs_reclassify_socket4(struct socket *sock)
1898 {
1899 struct sock *sk = sock->sk;
1900 BUG_ON(sock_owned_by_user(sk));
1901 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1902 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1903 }
1904
1905 static inline void
1906 cifs_reclassify_socket6(struct socket *sock)
1907 {
1908 struct sock *sk = sock->sk;
1909 BUG_ON(sock_owned_by_user(sk));
1910 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1911 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1912 }
1913 #else
1914 static inline void
1915 cifs_reclassify_socket4(struct socket *sock)
1916 {
1917 }
1918
1919 static inline void
1920 cifs_reclassify_socket6(struct socket *sock)
1921 {
1922 }
1923 #endif
1924
1925 /* See RFC1001 section 14 on representation of Netbios names */
1926 static void rfc1002mangle(char *target, char *source, unsigned int length)
1927 {
1928 unsigned int i, j;
1929
1930 for (i = 0, j = 0; i < (length); i++) {
1931 /* mask a nibble at a time and encode */
1932 target[j] = 'A' + (0x0F & (source[i] >> 4));
1933 target[j+1] = 'A' + (0x0F & source[i]);
1934 j += 2;
1935 }
1936
1937 }
1938
1939
1940 static int
1941 ipv4_connect(struct TCP_Server_Info *server)
1942 {
1943 int rc = 0;
1944 int val;
1945 bool connected = false;
1946 __be16 orig_port = 0;
1947 struct socket *socket = server->ssocket;
1948
1949 if (socket == NULL) {
1950 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1951 IPPROTO_TCP, &socket);
1952 if (rc < 0) {
1953 cERROR(1, "Error %d creating socket", rc);
1954 return rc;
1955 }
1956
1957 /* BB other socket options to set KEEPALIVE, NODELAY? */
1958 cFYI(1, "Socket created");
1959 server->ssocket = socket;
1960 socket->sk->sk_allocation = GFP_NOFS;
1961 cifs_reclassify_socket4(socket);
1962 }
1963
1964 /* user overrode default port */
1965 if (server->addr.sockAddr.sin_port) {
1966 rc = socket->ops->connect(socket, (struct sockaddr *)
1967 &server->addr.sockAddr,
1968 sizeof(struct sockaddr_in), 0);
1969 if (rc >= 0)
1970 connected = true;
1971 }
1972
1973 if (!connected) {
1974 /* save original port so we can retry user specified port
1975 later if fall back ports fail this time */
1976 orig_port = server->addr.sockAddr.sin_port;
1977
1978 /* do not retry on the same port we just failed on */
1979 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1980 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1981 rc = socket->ops->connect(socket,
1982 (struct sockaddr *)
1983 &server->addr.sockAddr,
1984 sizeof(struct sockaddr_in), 0);
1985 if (rc >= 0)
1986 connected = true;
1987 }
1988 }
1989 if (!connected) {
1990 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1991 rc = socket->ops->connect(socket, (struct sockaddr *)
1992 &server->addr.sockAddr,
1993 sizeof(struct sockaddr_in), 0);
1994 if (rc >= 0)
1995 connected = true;
1996 }
1997
1998 /* give up here - unless we want to retry on different
1999 protocol families some day */
2000 if (!connected) {
2001 if (orig_port)
2002 server->addr.sockAddr.sin_port = orig_port;
2003 cFYI(1, "Error %d connecting to server via ipv4", rc);
2004 sock_release(socket);
2005 server->ssocket = NULL;
2006 return rc;
2007 }
2008
2009
2010 /*
2011 * Eventually check for other socket options to change from
2012 * the default. sock_setsockopt not used because it expects
2013 * user space buffer
2014 */
2015 socket->sk->sk_rcvtimeo = 7 * HZ;
2016 socket->sk->sk_sndtimeo = 5 * HZ;
2017
2018 /* make the bufsizes depend on wsize/rsize and max requests */
2019 if (server->noautotune) {
2020 if (socket->sk->sk_sndbuf < (200 * 1024))
2021 socket->sk->sk_sndbuf = 200 * 1024;
2022 if (socket->sk->sk_rcvbuf < (140 * 1024))
2023 socket->sk->sk_rcvbuf = 140 * 1024;
2024 }
2025
2026 if (server->tcp_nodelay) {
2027 val = 1;
2028 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2029 (char *)&val, sizeof(val));
2030 if (rc)
2031 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2032 }
2033
2034 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2035 socket->sk->sk_sndbuf,
2036 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2037
2038 /* send RFC1001 sessinit */
2039 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2040 /* some servers require RFC1001 sessinit before sending
2041 negprot - BB check reconnection in case where second
2042 sessinit is sent but no second negprot */
2043 struct rfc1002_session_packet *ses_init_buf;
2044 struct smb_hdr *smb_buf;
2045 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2046 GFP_KERNEL);
2047 if (ses_init_buf) {
2048 ses_init_buf->trailer.session_req.called_len = 32;
2049 if (server->server_RFC1001_name &&
2050 server->server_RFC1001_name[0] != 0)
2051 rfc1002mangle(ses_init_buf->trailer.
2052 session_req.called_name,
2053 server->server_RFC1001_name,
2054 RFC1001_NAME_LEN_WITH_NULL);
2055 else
2056 rfc1002mangle(ses_init_buf->trailer.
2057 session_req.called_name,
2058 DEFAULT_CIFS_CALLED_NAME,
2059 RFC1001_NAME_LEN_WITH_NULL);
2060
2061 ses_init_buf->trailer.session_req.calling_len = 32;
2062
2063 /* calling name ends in null (byte 16) from old smb
2064 convention. */
2065 if (server->workstation_RFC1001_name &&
2066 server->workstation_RFC1001_name[0] != 0)
2067 rfc1002mangle(ses_init_buf->trailer.
2068 session_req.calling_name,
2069 server->workstation_RFC1001_name,
2070 RFC1001_NAME_LEN_WITH_NULL);
2071 else
2072 rfc1002mangle(ses_init_buf->trailer.
2073 session_req.calling_name,
2074 "LINUX_CIFS_CLNT",
2075 RFC1001_NAME_LEN_WITH_NULL);
2076
2077 ses_init_buf->trailer.session_req.scope1 = 0;
2078 ses_init_buf->trailer.session_req.scope2 = 0;
2079 smb_buf = (struct smb_hdr *)ses_init_buf;
2080 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2081 smb_buf->smb_buf_length = 0x81000044;
2082 rc = smb_send(server, smb_buf, 0x44);
2083 kfree(ses_init_buf);
2084 msleep(1); /* RFC1001 layer in at least one server
2085 requires very short break before negprot
2086 presumably because not expecting negprot
2087 to follow so fast. This is a simple
2088 solution that works without
2089 complicating the code and causes no
2090 significant slowing down on mount
2091 for everyone else */
2092 }
2093 /* else the negprot may still work without this
2094 even though malloc failed */
2095
2096 }
2097
2098 return rc;
2099 }
2100
2101 static int
2102 ipv6_connect(struct TCP_Server_Info *server)
2103 {
2104 int rc = 0;
2105 int val;
2106 bool connected = false;
2107 __be16 orig_port = 0;
2108 struct socket *socket = server->ssocket;
2109
2110 if (socket == NULL) {
2111 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2112 IPPROTO_TCP, &socket);
2113 if (rc < 0) {
2114 cERROR(1, "Error %d creating ipv6 socket", rc);
2115 socket = NULL;
2116 return rc;
2117 }
2118
2119 /* BB other socket options to set KEEPALIVE, NODELAY? */
2120 cFYI(1, "ipv6 Socket created");
2121 server->ssocket = socket;
2122 socket->sk->sk_allocation = GFP_NOFS;
2123 cifs_reclassify_socket6(socket);
2124 }
2125
2126 /* user overrode default port */
2127 if (server->addr.sockAddr6.sin6_port) {
2128 rc = socket->ops->connect(socket,
2129 (struct sockaddr *) &server->addr.sockAddr6,
2130 sizeof(struct sockaddr_in6), 0);
2131 if (rc >= 0)
2132 connected = true;
2133 }
2134
2135 if (!connected) {
2136 /* save original port so we can retry user specified port
2137 later if fall back ports fail this time */
2138
2139 orig_port = server->addr.sockAddr6.sin6_port;
2140 /* do not retry on the same port we just failed on */
2141 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2142 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2143 rc = socket->ops->connect(socket, (struct sockaddr *)
2144 &server->addr.sockAddr6,
2145 sizeof(struct sockaddr_in6), 0);
2146 if (rc >= 0)
2147 connected = true;
2148 }
2149 }
2150 if (!connected) {
2151 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2152 rc = socket->ops->connect(socket, (struct sockaddr *)
2153 &server->addr.sockAddr6,
2154 sizeof(struct sockaddr_in6), 0);
2155 if (rc >= 0)
2156 connected = true;
2157 }
2158
2159 /* give up here - unless we want to retry on different
2160 protocol families some day */
2161 if (!connected) {
2162 if (orig_port)
2163 server->addr.sockAddr6.sin6_port = orig_port;
2164 cFYI(1, "Error %d connecting to server via ipv6", rc);
2165 sock_release(socket);
2166 server->ssocket = NULL;
2167 return rc;
2168 }
2169
2170 /*
2171 * Eventually check for other socket options to change from
2172 * the default. sock_setsockopt not used because it expects
2173 * user space buffer
2174 */
2175 socket->sk->sk_rcvtimeo = 7 * HZ;
2176 socket->sk->sk_sndtimeo = 5 * HZ;
2177
2178 if (server->tcp_nodelay) {
2179 val = 1;
2180 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2181 (char *)&val, sizeof(val));
2182 if (rc)
2183 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2184 }
2185
2186 server->ssocket = socket;
2187
2188 return rc;
2189 }
2190
2191 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2192 struct super_block *sb, struct smb_vol *vol_info)
2193 {
2194 /* if we are reconnecting then should we check to see if
2195 * any requested capabilities changed locally e.g. via
2196 * remount but we can not do much about it here
2197 * if they have (even if we could detect it by the following)
2198 * Perhaps we could add a backpointer to array of sb from tcon
2199 * or if we change to make all sb to same share the same
2200 * sb as NFS - then we only have one backpointer to sb.
2201 * What if we wanted to mount the server share twice once with
2202 * and once without posixacls or posix paths? */
2203 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2204
2205 if (vol_info && vol_info->no_linux_ext) {
2206 tcon->fsUnixInfo.Capability = 0;
2207 tcon->unix_ext = 0; /* Unix Extensions disabled */
2208 cFYI(1, "Linux protocol extensions disabled");
2209 return;
2210 } else if (vol_info)
2211 tcon->unix_ext = 1; /* Unix Extensions supported */
2212
2213 if (tcon->unix_ext == 0) {
2214 cFYI(1, "Unix extensions disabled so not set on reconnect");
2215 return;
2216 }
2217
2218 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2219 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2220
2221 /* check for reconnect case in which we do not
2222 want to change the mount behavior if we can avoid it */
2223 if (vol_info == NULL) {
2224 /* turn off POSIX ACL and PATHNAMES if not set
2225 originally at mount time */
2226 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2227 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2228 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2229 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2230 cERROR(1, "POSIXPATH support change");
2231 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2232 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2233 cERROR(1, "possible reconnect error");
2234 cERROR(1, "server disabled POSIX path support");
2235 }
2236 }
2237
2238 cap &= CIFS_UNIX_CAP_MASK;
2239 if (vol_info && vol_info->no_psx_acl)
2240 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2241 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2242 cFYI(1, "negotiated posix acl support");
2243 if (sb)
2244 sb->s_flags |= MS_POSIXACL;
2245 }
2246
2247 if (vol_info && vol_info->posix_paths == 0)
2248 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2249 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2250 cFYI(1, "negotiate posix pathnames");
2251 if (sb)
2252 CIFS_SB(sb)->mnt_cifs_flags |=
2253 CIFS_MOUNT_POSIX_PATHS;
2254 }
2255
2256 /* We might be setting the path sep back to a different
2257 form if we are reconnecting and the server switched its
2258 posix path capability for this share */
2259 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2260 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2261
2262 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2263 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2264 CIFS_SB(sb)->rsize = 127 * 1024;
2265 cFYI(DBG2, "larger reads not supported by srv");
2266 }
2267 }
2268
2269
2270 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2271 #ifdef CONFIG_CIFS_DEBUG2
2272 if (cap & CIFS_UNIX_FCNTL_CAP)
2273 cFYI(1, "FCNTL cap");
2274 if (cap & CIFS_UNIX_EXTATTR_CAP)
2275 cFYI(1, "EXTATTR cap");
2276 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2277 cFYI(1, "POSIX path cap");
2278 if (cap & CIFS_UNIX_XATTR_CAP)
2279 cFYI(1, "XATTR cap");
2280 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2281 cFYI(1, "POSIX ACL cap");
2282 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2283 cFYI(1, "very large read cap");
2284 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2285 cFYI(1, "very large write cap");
2286 #endif /* CIFS_DEBUG2 */
2287 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2288 if (vol_info == NULL) {
2289 cFYI(1, "resetting capabilities failed");
2290 } else
2291 cERROR(1, "Negotiating Unix capabilities "
2292 "with the server failed. Consider "
2293 "mounting with the Unix Extensions\n"
2294 "disabled, if problems are found, "
2295 "by specifying the nounix mount "
2296 "option.");
2297
2298 }
2299 }
2300 }
2301
2302 static void
2303 convert_delimiter(char *path, char delim)
2304 {
2305 int i;
2306 char old_delim;
2307
2308 if (path == NULL)
2309 return;
2310
2311 if (delim == '/')
2312 old_delim = '\\';
2313 else
2314 old_delim = '/';
2315
2316 for (i = 0; path[i] != '\0'; i++) {
2317 if (path[i] == old_delim)
2318 path[i] = delim;
2319 }
2320 }
2321
2322 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2323 struct cifs_sb_info *cifs_sb)
2324 {
2325 if (pvolume_info->rsize > CIFSMaxBufSize) {
2326 cERROR(1, "rsize %d too large, using MaxBufSize",
2327 pvolume_info->rsize);
2328 cifs_sb->rsize = CIFSMaxBufSize;
2329 } else if ((pvolume_info->rsize) &&
2330 (pvolume_info->rsize <= CIFSMaxBufSize))
2331 cifs_sb->rsize = pvolume_info->rsize;
2332 else /* default */
2333 cifs_sb->rsize = CIFSMaxBufSize;
2334
2335 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2336 cERROR(1, "wsize %d too large, using 4096 instead",
2337 pvolume_info->wsize);
2338 cifs_sb->wsize = 4096;
2339 } else if (pvolume_info->wsize)
2340 cifs_sb->wsize = pvolume_info->wsize;
2341 else
2342 cifs_sb->wsize = min_t(const int,
2343 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2344 127*1024);
2345 /* old default of CIFSMaxBufSize was too small now
2346 that SMB Write2 can send multiple pages in kvec.
2347 RFC1001 does not describe what happens when frame
2348 bigger than 128K is sent so use that as max in
2349 conjunction with 52K kvec constraint on arch with 4K
2350 page size */
2351
2352 if (cifs_sb->rsize < 2048) {
2353 cifs_sb->rsize = 2048;
2354 /* Windows ME may prefer this */
2355 cFYI(1, "readsize set to minimum: 2048");
2356 }
2357 /* calculate prepath */
2358 cifs_sb->prepath = pvolume_info->prepath;
2359 if (cifs_sb->prepath) {
2360 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2361 /* we can not convert the / to \ in the path
2362 separators in the prefixpath yet because we do not
2363 know (until reset_cifs_unix_caps is called later)
2364 whether POSIX PATH CAP is available. We normalize
2365 the / to \ after reset_cifs_unix_caps is called */
2366 pvolume_info->prepath = NULL;
2367 } else
2368 cifs_sb->prepathlen = 0;
2369 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2370 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2371 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2372 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2373 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2374 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2375
2376 if (pvolume_info->noperm)
2377 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2378 if (pvolume_info->setuids)
2379 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2380 if (pvolume_info->server_ino)
2381 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2382 if (pvolume_info->remap)
2383 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2384 if (pvolume_info->no_xattr)
2385 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2386 if (pvolume_info->sfu_emul)
2387 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2388 if (pvolume_info->nobrl)
2389 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2390 if (pvolume_info->nostrictsync)
2391 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2392 if (pvolume_info->mand_lock)
2393 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2394 if (pvolume_info->cifs_acl)
2395 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2396 if (pvolume_info->override_uid)
2397 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2398 if (pvolume_info->override_gid)
2399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2400 if (pvolume_info->dynperm)
2401 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2402 if (pvolume_info->direct_io) {
2403 cFYI(1, "mounting share using direct i/o");
2404 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2405 }
2406
2407 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2408 cERROR(1, "mount option dynperm ignored if cifsacl "
2409 "mount option supported");
2410 }
2411
2412 static int
2413 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2414 struct cifs_sb_info *cifs_sb, const char *full_path)
2415 {
2416 int rc;
2417 FILE_ALL_INFO *pfile_info;
2418
2419 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2420 if (pfile_info == NULL)
2421 return -ENOMEM;
2422
2423 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2424 0 /* not legacy */, cifs_sb->local_nls,
2425 cifs_sb->mnt_cifs_flags &
2426 CIFS_MOUNT_MAP_SPECIAL_CHR);
2427 kfree(pfile_info);
2428 return rc;
2429 }
2430
2431 static void
2432 cleanup_volume_info(struct smb_vol **pvolume_info)
2433 {
2434 struct smb_vol *volume_info;
2435
2436 if (!pvolume_info || !*pvolume_info)
2437 return;
2438
2439 volume_info = *pvolume_info;
2440 kzfree(volume_info->password);
2441 kfree(volume_info->UNC);
2442 kfree(volume_info->prepath);
2443 kfree(volume_info);
2444 *pvolume_info = NULL;
2445 return;
2446 }
2447
2448 #ifdef CONFIG_CIFS_DFS_UPCALL
2449 /* build_path_to_root returns full path to root when
2450 * we do not have an exiting connection (tcon) */
2451 static char *
2452 build_unc_path_to_root(const struct smb_vol *volume_info,
2453 const struct cifs_sb_info *cifs_sb)
2454 {
2455 char *full_path;
2456
2457 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2458 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2459 if (full_path == NULL)
2460 return ERR_PTR(-ENOMEM);
2461
2462 strncpy(full_path, volume_info->UNC, unc_len);
2463 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2464 int i;
2465 for (i = 0; i < unc_len; i++) {
2466 if (full_path[i] == '\\')
2467 full_path[i] = '/';
2468 }
2469 }
2470
2471 if (cifs_sb->prepathlen)
2472 strncpy(full_path + unc_len, cifs_sb->prepath,
2473 cifs_sb->prepathlen);
2474
2475 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2476 return full_path;
2477 }
2478 #endif
2479
2480 int
2481 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2482 char *mount_data_global, const char *devname)
2483 {
2484 int rc;
2485 int xid;
2486 struct smb_vol *volume_info;
2487 struct cifsSesInfo *pSesInfo;
2488 struct cifsTconInfo *tcon;
2489 struct TCP_Server_Info *srvTcp;
2490 char *full_path;
2491 char *mount_data = mount_data_global;
2492 #ifdef CONFIG_CIFS_DFS_UPCALL
2493 struct dfs_info3_param *referrals = NULL;
2494 unsigned int num_referrals = 0;
2495 int referral_walks_count = 0;
2496 try_mount_again:
2497 #endif
2498 rc = 0;
2499 tcon = NULL;
2500 pSesInfo = NULL;
2501 srvTcp = NULL;
2502 full_path = NULL;
2503
2504 xid = GetXid();
2505
2506 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2507 if (!volume_info) {
2508 rc = -ENOMEM;
2509 goto out;
2510 }
2511
2512 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2513 rc = -EINVAL;
2514 goto out;
2515 }
2516
2517 if (volume_info->nullauth) {
2518 cFYI(1, "null user");
2519 volume_info->username = "";
2520 } else if (volume_info->username) {
2521 /* BB fixme parse for domain name here */
2522 cFYI(1, "Username: %s", volume_info->username);
2523 } else {
2524 cifserror("No username specified");
2525 /* In userspace mount helper we can get user name from alternate
2526 locations such as env variables and files on disk */
2527 rc = -EINVAL;
2528 goto out;
2529 }
2530
2531 /* this is needed for ASCII cp to Unicode converts */
2532 if (volume_info->iocharset == NULL) {
2533 /* load_nls_default cannot return null */
2534 volume_info->local_nls = load_nls_default();
2535 } else {
2536 volume_info->local_nls = load_nls(volume_info->iocharset);
2537 if (volume_info->local_nls == NULL) {
2538 cERROR(1, "CIFS mount error: iocharset %s not found",
2539 volume_info->iocharset);
2540 rc = -ELIBACC;
2541 goto out;
2542 }
2543 }
2544 cifs_sb->local_nls = volume_info->local_nls;
2545
2546 /* get a reference to a tcp session */
2547 srvTcp = cifs_get_tcp_session(volume_info);
2548 if (IS_ERR(srvTcp)) {
2549 rc = PTR_ERR(srvTcp);
2550 goto out;
2551 }
2552
2553 /* get a reference to a SMB session */
2554 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2555 if (IS_ERR(pSesInfo)) {
2556 rc = PTR_ERR(pSesInfo);
2557 pSesInfo = NULL;
2558 goto mount_fail_check;
2559 }
2560
2561 setup_cifs_sb(volume_info, cifs_sb);
2562 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2563 sb->s_maxbytes = MAX_LFS_FILESIZE;
2564 else
2565 sb->s_maxbytes = MAX_NON_LFS;
2566
2567 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2568 sb->s_time_gran = 100;
2569
2570 /* search for existing tcon to this server share */
2571 tcon = cifs_get_tcon(pSesInfo, volume_info);
2572 if (IS_ERR(tcon)) {
2573 rc = PTR_ERR(tcon);
2574 tcon = NULL;
2575 goto remote_path_check;
2576 }
2577
2578 cifs_sb->tcon = tcon;
2579
2580 /* do not care if following two calls succeed - informational */
2581 if (!tcon->ipc) {
2582 CIFSSMBQFSDeviceInfo(xid, tcon);
2583 CIFSSMBQFSAttributeInfo(xid, tcon);
2584 }
2585
2586 /* tell server which Unix caps we support */
2587 if (tcon->ses->capabilities & CAP_UNIX)
2588 /* reset of caps checks mount to see if unix extensions
2589 disabled for just this mount */
2590 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2591 else
2592 tcon->unix_ext = 0; /* server does not support them */
2593
2594 /* convert forward to back slashes in prepath here if needed */
2595 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2596 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2597
2598 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2599 cifs_sb->rsize = 1024 * 127;
2600 cFYI(DBG2, "no very large read support, rsize now 127K");
2601 }
2602 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2603 cifs_sb->wsize = min(cifs_sb->wsize,
2604 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2605 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2606 cifs_sb->rsize = min(cifs_sb->rsize,
2607 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2608
2609 remote_path_check:
2610 /* check if a whole path (including prepath) is not remote */
2611 if (!rc && cifs_sb->prepathlen && tcon) {
2612 /* build_path_to_root works only when we have a valid tcon */
2613 full_path = cifs_build_path_to_root(cifs_sb);
2614 if (full_path == NULL) {
2615 rc = -ENOMEM;
2616 goto mount_fail_check;
2617 }
2618 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2619 if (rc != -EREMOTE) {
2620 kfree(full_path);
2621 goto mount_fail_check;
2622 }
2623 kfree(full_path);
2624 }
2625
2626 /* get referral if needed */
2627 if (rc == -EREMOTE) {
2628 #ifdef CONFIG_CIFS_DFS_UPCALL
2629 if (referral_walks_count > MAX_NESTED_LINKS) {
2630 /*
2631 * BB: when we implement proper loop detection,
2632 * we will remove this check. But now we need it
2633 * to prevent an indefinite loop if 'DFS tree' is
2634 * misconfigured (i.e. has loops).
2635 */
2636 rc = -ELOOP;
2637 goto mount_fail_check;
2638 }
2639 /* convert forward to back slashes in prepath here if needed */
2640 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2641 convert_delimiter(cifs_sb->prepath,
2642 CIFS_DIR_SEP(cifs_sb));
2643 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2644 if (IS_ERR(full_path)) {
2645 rc = PTR_ERR(full_path);
2646 goto mount_fail_check;
2647 }
2648
2649 cFYI(1, "Getting referral for: %s", full_path);
2650 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2651 cifs_sb->local_nls, &num_referrals, &referrals,
2652 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2653 if (!rc && num_referrals > 0) {
2654 char *fake_devname = NULL;
2655
2656 if (mount_data != mount_data_global)
2657 kfree(mount_data);
2658
2659 mount_data = cifs_compose_mount_options(
2660 cifs_sb->mountdata, full_path + 1,
2661 referrals, &fake_devname);
2662
2663 free_dfs_info_array(referrals, num_referrals);
2664 kfree(fake_devname);
2665 kfree(full_path);
2666
2667 if (IS_ERR(mount_data)) {
2668 rc = PTR_ERR(mount_data);
2669 mount_data = NULL;
2670 goto mount_fail_check;
2671 }
2672
2673 if (tcon)
2674 cifs_put_tcon(tcon);
2675 else if (pSesInfo)
2676 cifs_put_smb_ses(pSesInfo);
2677
2678 cleanup_volume_info(&volume_info);
2679 referral_walks_count++;
2680 FreeXid(xid);
2681 goto try_mount_again;
2682 }
2683 #else /* No DFS support, return error on mount */
2684 rc = -EOPNOTSUPP;
2685 #endif
2686 }
2687
2688 mount_fail_check:
2689 /* on error free sesinfo and tcon struct if needed */
2690 if (rc) {
2691 if (mount_data != mount_data_global)
2692 kfree(mount_data);
2693 /* If find_unc succeeded then rc == 0 so we can not end */
2694 /* up accidently freeing someone elses tcon struct */
2695 if (tcon)
2696 cifs_put_tcon(tcon);
2697 else if (pSesInfo)
2698 cifs_put_smb_ses(pSesInfo);
2699 else
2700 cifs_put_tcp_session(srvTcp);
2701 goto out;
2702 }
2703
2704 /* volume_info->password is freed above when existing session found
2705 (in which case it is not needed anymore) but when new sesion is created
2706 the password ptr is put in the new session structure (in which case the
2707 password will be freed at unmount time) */
2708 out:
2709 /* zero out password before freeing */
2710 cleanup_volume_info(&volume_info);
2711 FreeXid(xid);
2712 return rc;
2713 }
2714
2715 int
2716 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2717 const char *tree, struct cifsTconInfo *tcon,
2718 const struct nls_table *nls_codepage)
2719 {
2720 struct smb_hdr *smb_buffer;
2721 struct smb_hdr *smb_buffer_response;
2722 TCONX_REQ *pSMB;
2723 TCONX_RSP *pSMBr;
2724 unsigned char *bcc_ptr;
2725 int rc = 0;
2726 int length, bytes_left;
2727 __u16 count;
2728
2729 if (ses == NULL)
2730 return -EIO;
2731
2732 smb_buffer = cifs_buf_get();
2733 if (smb_buffer == NULL)
2734 return -ENOMEM;
2735
2736 smb_buffer_response = smb_buffer;
2737
2738 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2739 NULL /*no tid */ , 4 /*wct */ );
2740
2741 smb_buffer->Mid = GetNextMid(ses->server);
2742 smb_buffer->Uid = ses->Suid;
2743 pSMB = (TCONX_REQ *) smb_buffer;
2744 pSMBr = (TCONX_RSP *) smb_buffer_response;
2745
2746 pSMB->AndXCommand = 0xFF;
2747 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2748 bcc_ptr = &pSMB->Password[0];
2749 if ((ses->server->secMode) & SECMODE_USER) {
2750 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2751 *bcc_ptr = 0; /* password is null byte */
2752 bcc_ptr++; /* skip password */
2753 /* already aligned so no need to do it below */
2754 } else {
2755 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2756 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2757 specified as required (when that support is added to
2758 the vfs in the future) as only NTLM or the much
2759 weaker LANMAN (which we do not send by default) is accepted
2760 by Samba (not sure whether other servers allow
2761 NTLMv2 password here) */
2762 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2763 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2764 (ses->server->secType == LANMAN))
2765 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2766 ses->server->secMode &
2767 SECMODE_PW_ENCRYPT ? true : false,
2768 bcc_ptr);
2769 else
2770 #endif /* CIFS_WEAK_PW_HASH */
2771 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2772 bcc_ptr);
2773
2774 bcc_ptr += CIFS_SESS_KEY_SIZE;
2775 if (ses->capabilities & CAP_UNICODE) {
2776 /* must align unicode strings */
2777 *bcc_ptr = 0; /* null byte password */
2778 bcc_ptr++;
2779 }
2780 }
2781
2782 if (ses->server->secMode &
2783 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2784 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2785
2786 if (ses->capabilities & CAP_STATUS32) {
2787 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2788 }
2789 if (ses->capabilities & CAP_DFS) {
2790 smb_buffer->Flags2 |= SMBFLG2_DFS;
2791 }
2792 if (ses->capabilities & CAP_UNICODE) {
2793 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2794 length =
2795 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2796 6 /* max utf8 char length in bytes */ *
2797 (/* server len*/ + 256 /* share len */), nls_codepage);
2798 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2799 bcc_ptr += 2; /* skip trailing null */
2800 } else { /* ASCII */
2801 strcpy(bcc_ptr, tree);
2802 bcc_ptr += strlen(tree) + 1;
2803 }
2804 strcpy(bcc_ptr, "?????");
2805 bcc_ptr += strlen("?????");
2806 bcc_ptr += 1;
2807 count = bcc_ptr - &pSMB->Password[0];
2808 pSMB->hdr.smb_buf_length += count;
2809 pSMB->ByteCount = cpu_to_le16(count);
2810
2811 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2812 CIFS_STD_OP);
2813
2814 /* above now done in SendReceive */
2815 if ((rc == 0) && (tcon != NULL)) {
2816 bool is_unicode;
2817
2818 tcon->tidStatus = CifsGood;
2819 tcon->need_reconnect = false;
2820 tcon->tid = smb_buffer_response->Tid;
2821 bcc_ptr = pByteArea(smb_buffer_response);
2822 bytes_left = BCC(smb_buffer_response);
2823 length = strnlen(bcc_ptr, bytes_left - 2);
2824 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2825 is_unicode = true;
2826 else
2827 is_unicode = false;
2828
2829
2830 /* skip service field (NB: this field is always ASCII) */
2831 if (length == 3) {
2832 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2833 (bcc_ptr[2] == 'C')) {
2834 cFYI(1, "IPC connection");
2835 tcon->ipc = 1;
2836 }
2837 } else if (length == 2) {
2838 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2839 /* the most common case */
2840 cFYI(1, "disk share connection");
2841 }
2842 }
2843 bcc_ptr += length + 1;
2844 bytes_left -= (length + 1);
2845 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2846
2847 /* mostly informational -- no need to fail on error here */
2848 kfree(tcon->nativeFileSystem);
2849 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2850 bytes_left, is_unicode,
2851 nls_codepage);
2852
2853 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2854
2855 if ((smb_buffer_response->WordCount == 3) ||
2856 (smb_buffer_response->WordCount == 7))
2857 /* field is in same location */
2858 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2859 else
2860 tcon->Flags = 0;
2861 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2862 } else if ((rc == 0) && tcon == NULL) {
2863 /* all we need to save for IPC$ connection */
2864 ses->ipc_tid = smb_buffer_response->Tid;
2865 }
2866
2867 cifs_buf_release(smb_buffer);
2868 return rc;
2869 }
2870
2871 int
2872 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2873 {
2874 int rc = 0;
2875 char *tmp;
2876
2877 if (cifs_sb->tcon)
2878 cifs_put_tcon(cifs_sb->tcon);
2879
2880 cifs_sb->tcon = NULL;
2881 tmp = cifs_sb->prepath;
2882 cifs_sb->prepathlen = 0;
2883 cifs_sb->prepath = NULL;
2884 kfree(tmp);
2885
2886 return rc;
2887 }
2888
2889 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
2890 {
2891 int rc = 0;
2892 struct TCP_Server_Info *server = ses->server;
2893
2894 /* only send once per connect */
2895 if (server->maxBuf != 0)
2896 return 0;
2897
2898 rc = CIFSSMBNegotiate(xid, ses);
2899 if (rc == -EAGAIN) {
2900 /* retry only once on 1st time connection */
2901 rc = CIFSSMBNegotiate(xid, ses);
2902 if (rc == -EAGAIN)
2903 rc = -EHOSTDOWN;
2904 }
2905 if (rc == 0) {
2906 spin_lock(&GlobalMid_Lock);
2907 if (server->tcpStatus != CifsExiting)
2908 server->tcpStatus = CifsGood;
2909 else
2910 rc = -EHOSTDOWN;
2911 spin_unlock(&GlobalMid_Lock);
2912
2913 }
2914
2915 return rc;
2916 }
2917
2918
2919 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
2920 struct nls_table *nls_info)
2921 {
2922 int rc = 0;
2923 struct TCP_Server_Info *server = ses->server;
2924
2925 ses->flags = 0;
2926 ses->capabilities = server->capabilities;
2927 if (linuxExtEnabled == 0)
2928 ses->capabilities &= (~CAP_UNIX);
2929
2930 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2931 server->secMode, server->capabilities, server->timeAdj);
2932
2933 rc = CIFS_SessSetup(xid, ses, nls_info);
2934 if (rc) {
2935 cERROR(1, "Send error in SessSetup = %d", rc);
2936 } else {
2937 cFYI(1, "CIFS Session Established successfully");
2938 spin_lock(&GlobalMid_Lock);
2939 ses->status = CifsGood;
2940 ses->need_reconnect = false;
2941 spin_unlock(&GlobalMid_Lock);
2942 }
2943
2944 return rc;
2945 }
2946
Linux kernel - Deliverables
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