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[CIFS] cifs: reconnect unresponsive servers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blobf5d7b59a355316dc22de8affebff3c07d08f75ae
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 "fscache.h"
51
52 #define CIFS_PORT 445
53 #define RFC1001_PORT 139
54
55 /* SMB echo "timeout" -- FIXME: tunable? */
56 #define SMB_ECHO_INTERVAL (60 * HZ)
57
58 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
59 unsigned char *p24);
60
61 extern mempool_t *cifs_req_poolp;
62
63 struct smb_vol {
64 char *username;
65 char *password;
66 char *domainname;
67 char *UNC;
68 char *UNCip;
69 char *iocharset; /* local code page for mapping to and from Unicode */
70 char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
71 char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
72 uid_t cred_uid;
73 uid_t linux_uid;
74 gid_t linux_gid;
75 mode_t file_mode;
76 mode_t dir_mode;
77 unsigned secFlg;
78 bool retry:1;
79 bool intr:1;
80 bool setuids:1;
81 bool override_uid:1;
82 bool override_gid:1;
83 bool dynperm:1;
84 bool noperm:1;
85 bool no_psx_acl:1; /* set if posix acl support should be disabled */
86 bool cifs_acl:1;
87 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
88 bool server_ino:1; /* use inode numbers from server ie UniqueId */
89 bool direct_io:1;
90 bool remap:1; /* set to remap seven reserved chars in filenames */
91 bool posix_paths:1; /* unset to not ask for posix pathnames. */
92 bool no_linux_ext:1;
93 bool sfu_emul:1;
94 bool nullauth:1; /* attempt to authenticate with null user */
95 bool nocase:1; /* request case insensitive filenames */
96 bool nobrl:1; /* disable sending byte range locks to srv */
97 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
98 bool seal:1; /* request transport encryption on share */
99 bool nodfs:1; /* Do not request DFS, even if available */
100 bool local_lease:1; /* check leases only on local system, not remote */
101 bool noblocksnd:1;
102 bool noautotune:1;
103 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
104 bool fsc:1; /* enable fscache */
105 bool mfsymlinks:1; /* use Minshall+French Symlinks */
106 bool multiuser:1;
107 unsigned int rsize;
108 unsigned int wsize;
109 bool sockopt_tcp_nodelay:1;
110 unsigned short int port;
111 unsigned long actimeo; /* attribute cache timeout (jiffies) */
112 char *prepath;
113 struct sockaddr_storage srcaddr; /* allow binding to a local IP */
114 struct nls_table *local_nls;
115 };
116
117 /* FIXME: should these be tunable? */
118 #define TLINK_ERROR_EXPIRE (1 * HZ)
119 #define TLINK_IDLE_EXPIRE (600 * HZ)
120
121 static int ip_connect(struct TCP_Server_Info *server);
122 static int generic_ip_connect(struct TCP_Server_Info *server);
123 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
124 static void cifs_prune_tlinks(struct work_struct *work);
125
126 /*
127 * cifs tcp session reconnection
128 *
129 * mark tcp session as reconnecting so temporarily locked
130 * mark all smb sessions as reconnecting for tcp session
131 * reconnect tcp session
132 * wake up waiters on reconnection? - (not needed currently)
133 */
134 static int
135 cifs_reconnect(struct TCP_Server_Info *server)
136 {
137 int rc = 0;
138 struct list_head *tmp, *tmp2;
139 struct cifsSesInfo *ses;
140 struct cifsTconInfo *tcon;
141 struct mid_q_entry *mid_entry;
142
143 spin_lock(&GlobalMid_Lock);
144 if (server->tcpStatus == CifsExiting) {
145 /* the demux thread will exit normally
146 next time through the loop */
147 spin_unlock(&GlobalMid_Lock);
148 return rc;
149 } else
150 server->tcpStatus = CifsNeedReconnect;
151 spin_unlock(&GlobalMid_Lock);
152 server->maxBuf = 0;
153
154 cFYI(1, "Reconnecting tcp session");
155
156 /* before reconnecting the tcp session, mark the smb session (uid)
157 and the tid bad so they are not used until reconnected */
158 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
159 spin_lock(&cifs_tcp_ses_lock);
160 list_for_each(tmp, &server->smb_ses_list) {
161 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
162 ses->need_reconnect = true;
163 ses->ipc_tid = 0;
164 list_for_each(tmp2, &ses->tcon_list) {
165 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
166 tcon->need_reconnect = true;
167 }
168 }
169 spin_unlock(&cifs_tcp_ses_lock);
170
171 /* do not want to be sending data on a socket we are freeing */
172 cFYI(1, "%s: tearing down socket", __func__);
173 mutex_lock(&server->srv_mutex);
174 if (server->ssocket) {
175 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
176 server->ssocket->flags);
177 kernel_sock_shutdown(server->ssocket, SHUT_WR);
178 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
179 server->ssocket->state,
180 server->ssocket->flags);
181 sock_release(server->ssocket);
182 server->ssocket = NULL;
183 }
184 server->sequence_number = 0;
185 server->session_estab = false;
186 kfree(server->session_key.response);
187 server->session_key.response = NULL;
188 server->session_key.len = 0;
189 server->lstrp = jiffies;
190 mutex_unlock(&server->srv_mutex);
191
192 /* mark submitted MIDs for retry and issue callback */
193 cFYI(1, "%s: issuing mid callbacks", __func__);
194 spin_lock(&GlobalMid_Lock);
195 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
196 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
197 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
198 mid_entry->midState = MID_RETRY_NEEDED;
199 list_del_init(&mid_entry->qhead);
200 mid_entry->callback(mid_entry);
201 }
202 spin_unlock(&GlobalMid_Lock);
203
204 while ((server->tcpStatus != CifsExiting) &&
205 (server->tcpStatus != CifsGood)) {
206 try_to_freeze();
207
208 /* we should try only the port we connected to before */
209 rc = generic_ip_connect(server);
210 if (rc) {
211 cFYI(1, "reconnect error %d", rc);
212 msleep(3000);
213 } else {
214 atomic_inc(&tcpSesReconnectCount);
215 spin_lock(&GlobalMid_Lock);
216 if (server->tcpStatus != CifsExiting)
217 server->tcpStatus = CifsGood;
218 spin_unlock(&GlobalMid_Lock);
219 }
220 }
221
222 return rc;
223 }
224
225 /*
226 return codes:
227 0 not a transact2, or all data present
228 >0 transact2 with that much data missing
229 -EINVAL = invalid transact2
230
231 */
232 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
233 {
234 struct smb_t2_rsp *pSMBt;
235 int total_data_size;
236 int data_in_this_rsp;
237 int remaining;
238
239 if (pSMB->Command != SMB_COM_TRANSACTION2)
240 return 0;
241
242 /* check for plausible wct, bcc and t2 data and parm sizes */
243 /* check for parm and data offset going beyond end of smb */
244 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
245 cFYI(1, "invalid transact2 word count");
246 return -EINVAL;
247 }
248
249 pSMBt = (struct smb_t2_rsp *)pSMB;
250
251 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
252 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
253
254 remaining = total_data_size - data_in_this_rsp;
255
256 if (remaining == 0)
257 return 0;
258 else if (remaining < 0) {
259 cFYI(1, "total data %d smaller than data in frame %d",
260 total_data_size, data_in_this_rsp);
261 return -EINVAL;
262 } else {
263 cFYI(1, "missing %d bytes from transact2, check next response",
264 remaining);
265 if (total_data_size > maxBufSize) {
266 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
267 total_data_size, maxBufSize);
268 return -EINVAL;
269 }
270 return remaining;
271 }
272 }
273
274 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
275 {
276 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
277 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
278 int total_data_size;
279 int total_in_buf;
280 int remaining;
281 int total_in_buf2;
282 char *data_area_of_target;
283 char *data_area_of_buf2;
284 __u16 byte_count;
285
286 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
287
288 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
289 cFYI(1, "total data size of primary and secondary t2 differ");
290 }
291
292 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
293
294 remaining = total_data_size - total_in_buf;
295
296 if (remaining < 0)
297 return -EINVAL;
298
299 if (remaining == 0) /* nothing to do, ignore */
300 return 0;
301
302 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
303 if (remaining < total_in_buf2) {
304 cFYI(1, "transact2 2nd response contains too much data");
305 }
306
307 /* find end of first SMB data area */
308 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
309 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
310 /* validate target area */
311
312 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
313 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
314
315 data_area_of_target += total_in_buf;
316
317 /* copy second buffer into end of first buffer */
318 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
319 total_in_buf += total_in_buf2;
320 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
321 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
322 byte_count += total_in_buf2;
323 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
324
325 byte_count = pTargetSMB->smb_buf_length;
326 byte_count += total_in_buf2;
327
328 /* BB also add check that we are not beyond maximum buffer size */
329
330 pTargetSMB->smb_buf_length = byte_count;
331
332 if (remaining == total_in_buf2) {
333 cFYI(1, "found the last secondary response");
334 return 0; /* we are done */
335 } else /* more responses to go */
336 return 1;
337
338 }
339
340 static void
341 cifs_echo_request(struct work_struct *work)
342 {
343 int rc;
344 struct TCP_Server_Info *server = container_of(work,
345 struct TCP_Server_Info, echo.work);
346
347 /* no need to ping if we got a response recently */
348 if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
349 goto requeue_echo;
350
351 rc = CIFSSMBEcho(server);
352 if (rc)
353 cFYI(1, "Unable to send echo request to server: %s",
354 server->hostname);
355
356 requeue_echo:
357 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
358 }
359
360 static int
361 cifs_demultiplex_thread(struct TCP_Server_Info *server)
362 {
363 int length;
364 unsigned int pdu_length, total_read;
365 struct smb_hdr *smb_buffer = NULL;
366 struct smb_hdr *bigbuf = NULL;
367 struct smb_hdr *smallbuf = NULL;
368 struct msghdr smb_msg;
369 struct kvec iov;
370 struct socket *csocket = server->ssocket;
371 struct list_head *tmp, *tmp2;
372 struct task_struct *task_to_wake = NULL;
373 struct mid_q_entry *mid_entry;
374 char temp;
375 bool isLargeBuf = false;
376 bool isMultiRsp;
377 int reconnect;
378
379 current->flags |= PF_MEMALLOC;
380 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
381
382 length = atomic_inc_return(&tcpSesAllocCount);
383 if (length > 1)
384 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
385 GFP_KERNEL);
386
387 set_freezable();
388 while (server->tcpStatus != CifsExiting) {
389 if (try_to_freeze())
390 continue;
391 if (bigbuf == NULL) {
392 bigbuf = cifs_buf_get();
393 if (!bigbuf) {
394 cERROR(1, "No memory for large SMB response");
395 msleep(3000);
396 /* retry will check if exiting */
397 continue;
398 }
399 } else if (isLargeBuf) {
400 /* we are reusing a dirty large buf, clear its start */
401 memset(bigbuf, 0, sizeof(struct smb_hdr));
402 }
403
404 if (smallbuf == NULL) {
405 smallbuf = cifs_small_buf_get();
406 if (!smallbuf) {
407 cERROR(1, "No memory for SMB response");
408 msleep(1000);
409 /* retry will check if exiting */
410 continue;
411 }
412 /* beginning of smb buffer is cleared in our buf_get */
413 } else /* if existing small buf clear beginning */
414 memset(smallbuf, 0, sizeof(struct smb_hdr));
415
416 isLargeBuf = false;
417 isMultiRsp = false;
418 smb_buffer = smallbuf;
419 iov.iov_base = smb_buffer;
420 iov.iov_len = 4;
421 smb_msg.msg_control = NULL;
422 smb_msg.msg_controllen = 0;
423 pdu_length = 4; /* enough to get RFC1001 header */
424
425 incomplete_rcv:
426 if (echo_retries > 0 &&
427 time_after(jiffies, server->lstrp +
428 (echo_retries * SMB_ECHO_INTERVAL))) {
429 cERROR(1, "Server %s has not responded in %d seconds. "
430 "Reconnecting...", server->hostname,
431 (echo_retries * SMB_ECHO_INTERVAL / HZ));
432 cifs_reconnect(server);
433 csocket = server->ssocket;
434 wake_up(&server->response_q);
435 continue;
436 }
437
438 length =
439 kernel_recvmsg(csocket, &smb_msg,
440 &iov, 1, pdu_length, 0 /* BB other flags? */);
441
442 if (server->tcpStatus == CifsExiting) {
443 break;
444 } else if (server->tcpStatus == CifsNeedReconnect) {
445 cFYI(1, "Reconnect after server stopped responding");
446 cifs_reconnect(server);
447 cFYI(1, "call to reconnect done");
448 csocket = server->ssocket;
449 continue;
450 } else if (length == -ERESTARTSYS ||
451 length == -EAGAIN ||
452 length == -EINTR) {
453 msleep(1); /* minimum sleep to prevent looping
454 allowing socket to clear and app threads to set
455 tcpStatus CifsNeedReconnect if server hung */
456 if (pdu_length < 4) {
457 iov.iov_base = (4 - pdu_length) +
458 (char *)smb_buffer;
459 iov.iov_len = pdu_length;
460 smb_msg.msg_control = NULL;
461 smb_msg.msg_controllen = 0;
462 goto incomplete_rcv;
463 } else
464 continue;
465 } else if (length <= 0) {
466 cFYI(1, "Reconnect after unexpected peek error %d",
467 length);
468 cifs_reconnect(server);
469 csocket = server->ssocket;
470 wake_up(&server->response_q);
471 continue;
472 } else if (length < pdu_length) {
473 cFYI(1, "requested %d bytes but only got %d bytes",
474 pdu_length, length);
475 pdu_length -= length;
476 msleep(1);
477 goto incomplete_rcv;
478 }
479
480 /* The right amount was read from socket - 4 bytes */
481 /* so we can now interpret the length field */
482
483 /* the first byte big endian of the length field,
484 is actually not part of the length but the type
485 with the most common, zero, as regular data */
486 temp = *((char *) smb_buffer);
487
488 /* Note that FC 1001 length is big endian on the wire,
489 but we convert it here so it is always manipulated
490 as host byte order */
491 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
492 smb_buffer->smb_buf_length = pdu_length;
493
494 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
495
496 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
497 continue;
498 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
499 cFYI(1, "Good RFC 1002 session rsp");
500 continue;
501 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
502 /* we get this from Windows 98 instead of
503 an error on SMB negprot response */
504 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
505 pdu_length);
506 /* give server a second to clean up */
507 msleep(1000);
508 /* always try 445 first on reconnect since we get NACK
509 * on some if we ever connected to port 139 (the NACK
510 * is since we do not begin with RFC1001 session
511 * initialize frame)
512 */
513 cifs_set_port((struct sockaddr *)
514 &server->dstaddr, CIFS_PORT);
515 cifs_reconnect(server);
516 csocket = server->ssocket;
517 wake_up(&server->response_q);
518 continue;
519 } else if (temp != (char) 0) {
520 cERROR(1, "Unknown RFC 1002 frame");
521 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
522 length);
523 cifs_reconnect(server);
524 csocket = server->ssocket;
525 continue;
526 }
527
528 /* else we have an SMB response */
529 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
530 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
531 cERROR(1, "Invalid size SMB length %d pdu_length %d",
532 length, pdu_length+4);
533 cifs_reconnect(server);
534 csocket = server->ssocket;
535 wake_up(&server->response_q);
536 continue;
537 }
538
539 /* else length ok */
540 reconnect = 0;
541
542 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
543 isLargeBuf = true;
544 memcpy(bigbuf, smallbuf, 4);
545 smb_buffer = bigbuf;
546 }
547 length = 0;
548 iov.iov_base = 4 + (char *)smb_buffer;
549 iov.iov_len = pdu_length;
550 for (total_read = 0; total_read < pdu_length;
551 total_read += length) {
552 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
553 pdu_length - total_read, 0);
554 if (server->tcpStatus == CifsExiting) {
555 /* then will exit */
556 reconnect = 2;
557 break;
558 } else if (server->tcpStatus == CifsNeedReconnect) {
559 cifs_reconnect(server);
560 csocket = server->ssocket;
561 /* Reconnect wakes up rspns q */
562 /* Now we will reread sock */
563 reconnect = 1;
564 break;
565 } else if (length == -ERESTARTSYS ||
566 length == -EAGAIN ||
567 length == -EINTR) {
568 msleep(1); /* minimum sleep to prevent looping,
569 allowing socket to clear and app
570 threads to set tcpStatus
571 CifsNeedReconnect if server hung*/
572 length = 0;
573 continue;
574 } else if (length <= 0) {
575 cERROR(1, "Received no data, expecting %d",
576 pdu_length - total_read);
577 cifs_reconnect(server);
578 csocket = server->ssocket;
579 reconnect = 1;
580 break;
581 }
582 }
583 if (reconnect == 2)
584 break;
585 else if (reconnect == 1)
586 continue;
587
588 length += 4; /* account for rfc1002 hdr */
589
590
591 dump_smb(smb_buffer, length);
592 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
593 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
594 continue;
595 }
596
597 mid_entry = NULL;
598 server->lstrp = jiffies;
599
600 spin_lock(&GlobalMid_Lock);
601 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
602 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
603
604 if ((mid_entry->mid == smb_buffer->Mid) &&
605 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
606 (mid_entry->command == smb_buffer->Command)) {
607 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
608 /* We have a multipart transact2 resp */
609 isMultiRsp = true;
610 if (mid_entry->resp_buf) {
611 /* merge response - fix up 1st*/
612 if (coalesce_t2(smb_buffer,
613 mid_entry->resp_buf)) {
614 mid_entry->multiRsp =
615 true;
616 break;
617 } else {
618 /* all parts received */
619 mid_entry->multiEnd =
620 true;
621 goto multi_t2_fnd;
622 }
623 } else {
624 if (!isLargeBuf) {
625 cERROR(1, "1st trans2 resp needs bigbuf");
626 /* BB maybe we can fix this up, switch
627 to already allocated large buffer? */
628 } else {
629 /* Have first buffer */
630 mid_entry->resp_buf =
631 smb_buffer;
632 mid_entry->largeBuf =
633 true;
634 bigbuf = NULL;
635 }
636 }
637 break;
638 }
639 mid_entry->resp_buf = smb_buffer;
640 mid_entry->largeBuf = isLargeBuf;
641 multi_t2_fnd:
642 mid_entry->midState = MID_RESPONSE_RECEIVED;
643 list_del_init(&mid_entry->qhead);
644 mid_entry->callback(mid_entry);
645 #ifdef CONFIG_CIFS_STATS2
646 mid_entry->when_received = jiffies;
647 #endif
648 break;
649 }
650 mid_entry = NULL;
651 }
652 spin_unlock(&GlobalMid_Lock);
653
654 if (mid_entry != NULL) {
655 /* Was previous buf put in mpx struct for multi-rsp? */
656 if (!isMultiRsp) {
657 /* smb buffer will be freed by user thread */
658 if (isLargeBuf)
659 bigbuf = NULL;
660 else
661 smallbuf = NULL;
662 }
663 } else if (!is_valid_oplock_break(smb_buffer, server) &&
664 !isMultiRsp) {
665 cERROR(1, "No task to wake, unknown frame received! "
666 "NumMids %d", atomic_read(&midCount));
667 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
668 sizeof(struct smb_hdr));
669 #ifdef CONFIG_CIFS_DEBUG2
670 cifs_dump_detail(smb_buffer);
671 cifs_dump_mids(server);
672 #endif /* CIFS_DEBUG2 */
673
674 }
675 } /* end while !EXITING */
676
677 /* take it off the list, if it's not already */
678 spin_lock(&cifs_tcp_ses_lock);
679 list_del_init(&server->tcp_ses_list);
680 spin_unlock(&cifs_tcp_ses_lock);
681
682 spin_lock(&GlobalMid_Lock);
683 server->tcpStatus = CifsExiting;
684 spin_unlock(&GlobalMid_Lock);
685 wake_up_all(&server->response_q);
686
687 /* check if we have blocked requests that need to free */
688 /* Note that cifs_max_pending is normally 50, but
689 can be set at module install time to as little as two */
690 spin_lock(&GlobalMid_Lock);
691 if (atomic_read(&server->inFlight) >= cifs_max_pending)
692 atomic_set(&server->inFlight, cifs_max_pending - 1);
693 /* We do not want to set the max_pending too low or we
694 could end up with the counter going negative */
695 spin_unlock(&GlobalMid_Lock);
696 /* Although there should not be any requests blocked on
697 this queue it can not hurt to be paranoid and try to wake up requests
698 that may haven been blocked when more than 50 at time were on the wire
699 to the same server - they now will see the session is in exit state
700 and get out of SendReceive. */
701 wake_up_all(&server->request_q);
702 /* give those requests time to exit */
703 msleep(125);
704
705 if (server->ssocket) {
706 sock_release(csocket);
707 server->ssocket = NULL;
708 }
709 /* buffer usuallly freed in free_mid - need to free it here on exit */
710 cifs_buf_release(bigbuf);
711 if (smallbuf) /* no sense logging a debug message if NULL */
712 cifs_small_buf_release(smallbuf);
713
714 if (!list_empty(&server->pending_mid_q)) {
715 spin_lock(&GlobalMid_Lock);
716 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
717 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
718 cFYI(1, "Clearing Mid 0x%x - issuing callback",
719 mid_entry->mid);
720 list_del_init(&mid_entry->qhead);
721 mid_entry->callback(mid_entry);
722 }
723 spin_unlock(&GlobalMid_Lock);
724 /* 1/8th of sec is more than enough time for them to exit */
725 msleep(125);
726 }
727
728 if (!list_empty(&server->pending_mid_q)) {
729 /* mpx threads have not exited yet give them
730 at least the smb send timeout time for long ops */
731 /* due to delays on oplock break requests, we need
732 to wait at least 45 seconds before giving up
733 on a request getting a response and going ahead
734 and killing cifsd */
735 cFYI(1, "Wait for exit from demultiplex thread");
736 msleep(46000);
737 /* if threads still have not exited they are probably never
738 coming home not much else we can do but free the memory */
739 }
740
741 kfree(server->hostname);
742 task_to_wake = xchg(&server->tsk, NULL);
743 kfree(server);
744
745 length = atomic_dec_return(&tcpSesAllocCount);
746 if (length > 0)
747 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
748 GFP_KERNEL);
749
750 /* if server->tsk was NULL then wait for a signal before exiting */
751 if (!task_to_wake) {
752 set_current_state(TASK_INTERRUPTIBLE);
753 while (!signal_pending(current)) {
754 schedule();
755 set_current_state(TASK_INTERRUPTIBLE);
756 }
757 set_current_state(TASK_RUNNING);
758 }
759
760 module_put_and_exit(0);
761 }
762
763 /* extract the host portion of the UNC string */
764 static char *
765 extract_hostname(const char *unc)
766 {
767 const char *src;
768 char *dst, *delim;
769 unsigned int len;
770
771 /* skip double chars at beginning of string */
772 /* BB: check validity of these bytes? */
773 src = unc + 2;
774
775 /* delimiter between hostname and sharename is always '\\' now */
776 delim = strchr(src, '\\');
777 if (!delim)
778 return ERR_PTR(-EINVAL);
779
780 len = delim - src;
781 dst = kmalloc((len + 1), GFP_KERNEL);
782 if (dst == NULL)
783 return ERR_PTR(-ENOMEM);
784
785 memcpy(dst, src, len);
786 dst[len] = '\0';
787
788 return dst;
789 }
790
791 static int
792 cifs_parse_mount_options(char *options, const char *devname,
793 struct smb_vol *vol)
794 {
795 char *value;
796 char *data;
797 unsigned int temp_len, i, j;
798 char separator[2];
799 short int override_uid = -1;
800 short int override_gid = -1;
801 bool uid_specified = false;
802 bool gid_specified = false;
803 char *nodename = utsname()->nodename;
804
805 separator[0] = ',';
806 separator[1] = 0;
807
808 /*
809 * does not have to be perfect mapping since field is
810 * informational, only used for servers that do not support
811 * port 445 and it can be overridden at mount time
812 */
813 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
814 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
815 vol->source_rfc1001_name[i] = toupper(nodename[i]);
816
817 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
818 /* null target name indicates to use *SMBSERVR default called name
819 if we end up sending RFC1001 session initialize */
820 vol->target_rfc1001_name[0] = 0;
821 vol->cred_uid = current_uid();
822 vol->linux_uid = current_uid();
823 vol->linux_gid = current_gid();
824
825 /* default to only allowing write access to owner of the mount */
826 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
827
828 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
829 /* default is always to request posix paths. */
830 vol->posix_paths = 1;
831 /* default to using server inode numbers where available */
832 vol->server_ino = 1;
833
834 vol->actimeo = CIFS_DEF_ACTIMEO;
835
836 if (!options)
837 return 1;
838
839 if (strncmp(options, "sep=", 4) == 0) {
840 if (options[4] != 0) {
841 separator[0] = options[4];
842 options += 5;
843 } else {
844 cFYI(1, "Null separator not allowed");
845 }
846 }
847
848 while ((data = strsep(&options, separator)) != NULL) {
849 if (!*data)
850 continue;
851 if ((value = strchr(data, '=')) != NULL)
852 *value++ = '\0';
853
854 /* Have to parse this before we parse for "user" */
855 if (strnicmp(data, "user_xattr", 10) == 0) {
856 vol->no_xattr = 0;
857 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
858 vol->no_xattr = 1;
859 } else if (strnicmp(data, "user", 4) == 0) {
860 if (!value) {
861 printk(KERN_WARNING
862 "CIFS: invalid or missing username\n");
863 return 1; /* needs_arg; */
864 } else if (!*value) {
865 /* null user, ie anonymous, authentication */
866 vol->nullauth = 1;
867 }
868 if (strnlen(value, 200) < 200) {
869 vol->username = value;
870 } else {
871 printk(KERN_WARNING "CIFS: username too long\n");
872 return 1;
873 }
874 } else if (strnicmp(data, "pass", 4) == 0) {
875 if (!value) {
876 vol->password = NULL;
877 continue;
878 } else if (value[0] == 0) {
879 /* check if string begins with double comma
880 since that would mean the password really
881 does start with a comma, and would not
882 indicate an empty string */
883 if (value[1] != separator[0]) {
884 vol->password = NULL;
885 continue;
886 }
887 }
888 temp_len = strlen(value);
889 /* removed password length check, NTLM passwords
890 can be arbitrarily long */
891
892 /* if comma in password, the string will be
893 prematurely null terminated. Commas in password are
894 specified across the cifs mount interface by a double
895 comma ie ,, and a comma used as in other cases ie ','
896 as a parameter delimiter/separator is single and due
897 to the strsep above is temporarily zeroed. */
898
899 /* NB: password legally can have multiple commas and
900 the only illegal character in a password is null */
901
902 if ((value[temp_len] == 0) &&
903 (value[temp_len+1] == separator[0])) {
904 /* reinsert comma */
905 value[temp_len] = separator[0];
906 temp_len += 2; /* move after second comma */
907 while (value[temp_len] != 0) {
908 if (value[temp_len] == separator[0]) {
909 if (value[temp_len+1] ==
910 separator[0]) {
911 /* skip second comma */
912 temp_len++;
913 } else {
914 /* single comma indicating start
915 of next parm */
916 break;
917 }
918 }
919 temp_len++;
920 }
921 if (value[temp_len] == 0) {
922 options = NULL;
923 } else {
924 value[temp_len] = 0;
925 /* point option to start of next parm */
926 options = value + temp_len + 1;
927 }
928 /* go from value to value + temp_len condensing
929 double commas to singles. Note that this ends up
930 allocating a few bytes too many, which is ok */
931 vol->password = kzalloc(temp_len, GFP_KERNEL);
932 if (vol->password == NULL) {
933 printk(KERN_WARNING "CIFS: no memory "
934 "for password\n");
935 return 1;
936 }
937 for (i = 0, j = 0; i < temp_len; i++, j++) {
938 vol->password[j] = value[i];
939 if (value[i] == separator[0]
940 && value[i+1] == separator[0]) {
941 /* skip second comma */
942 i++;
943 }
944 }
945 vol->password[j] = 0;
946 } else {
947 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
948 if (vol->password == NULL) {
949 printk(KERN_WARNING "CIFS: no memory "
950 "for password\n");
951 return 1;
952 }
953 strcpy(vol->password, value);
954 }
955 } else if (!strnicmp(data, "ip", 2) ||
956 !strnicmp(data, "addr", 4)) {
957 if (!value || !*value) {
958 vol->UNCip = NULL;
959 } else if (strnlen(value, INET6_ADDRSTRLEN) <
960 INET6_ADDRSTRLEN) {
961 vol->UNCip = value;
962 } else {
963 printk(KERN_WARNING "CIFS: ip address "
964 "too long\n");
965 return 1;
966 }
967 } else if (strnicmp(data, "sec", 3) == 0) {
968 if (!value || !*value) {
969 cERROR(1, "no security value specified");
970 continue;
971 } else if (strnicmp(value, "krb5i", 5) == 0) {
972 vol->secFlg |= CIFSSEC_MAY_KRB5 |
973 CIFSSEC_MUST_SIGN;
974 } else if (strnicmp(value, "krb5p", 5) == 0) {
975 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
976 CIFSSEC_MAY_KRB5; */
977 cERROR(1, "Krb5 cifs privacy not supported");
978 return 1;
979 } else if (strnicmp(value, "krb5", 4) == 0) {
980 vol->secFlg |= CIFSSEC_MAY_KRB5;
981 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
982 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
983 CIFSSEC_MUST_SIGN;
984 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
985 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
986 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
987 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
988 CIFSSEC_MUST_SIGN;
989 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
990 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
991 } else if (strnicmp(value, "ntlmi", 5) == 0) {
992 vol->secFlg |= CIFSSEC_MAY_NTLM |
993 CIFSSEC_MUST_SIGN;
994 } else if (strnicmp(value, "ntlm", 4) == 0) {
995 /* ntlm is default so can be turned off too */
996 vol->secFlg |= CIFSSEC_MAY_NTLM;
997 } else if (strnicmp(value, "nontlm", 6) == 0) {
998 /* BB is there a better way to do this? */
999 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1000 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1001 } else if (strnicmp(value, "lanman", 6) == 0) {
1002 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1003 #endif
1004 } else if (strnicmp(value, "none", 4) == 0) {
1005 vol->nullauth = 1;
1006 } else {
1007 cERROR(1, "bad security option: %s", value);
1008 return 1;
1009 }
1010 } else if ((strnicmp(data, "unc", 3) == 0)
1011 || (strnicmp(data, "target", 6) == 0)
1012 || (strnicmp(data, "path", 4) == 0)) {
1013 if (!value || !*value) {
1014 printk(KERN_WARNING "CIFS: invalid path to "
1015 "network resource\n");
1016 return 1; /* needs_arg; */
1017 }
1018 if ((temp_len = strnlen(value, 300)) < 300) {
1019 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1020 if (vol->UNC == NULL)
1021 return 1;
1022 strcpy(vol->UNC, value);
1023 if (strncmp(vol->UNC, "//", 2) == 0) {
1024 vol->UNC[0] = '\\';
1025 vol->UNC[1] = '\\';
1026 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1027 printk(KERN_WARNING
1028 "CIFS: UNC Path does not begin "
1029 "with // or \\\\ \n");
1030 return 1;
1031 }
1032 } else {
1033 printk(KERN_WARNING "CIFS: UNC name too long\n");
1034 return 1;
1035 }
1036 } else if ((strnicmp(data, "domain", 3) == 0)
1037 || (strnicmp(data, "workgroup", 5) == 0)) {
1038 if (!value || !*value) {
1039 printk(KERN_WARNING "CIFS: invalid domain name\n");
1040 return 1; /* needs_arg; */
1041 }
1042 /* BB are there cases in which a comma can be valid in
1043 a domain name and need special handling? */
1044 if (strnlen(value, 256) < 256) {
1045 vol->domainname = value;
1046 cFYI(1, "Domain name set");
1047 } else {
1048 printk(KERN_WARNING "CIFS: domain name too "
1049 "long\n");
1050 return 1;
1051 }
1052 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1053 vol->srcaddr.ss_family = AF_UNSPEC;
1054
1055 if (!value || !*value) {
1056 printk(KERN_WARNING "CIFS: srcaddr value"
1057 " not specified.\n");
1058 return 1; /* needs_arg; */
1059 }
1060 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1061 value, strlen(value));
1062 if (i == 0) {
1063 printk(KERN_WARNING "CIFS: Could not parse"
1064 " srcaddr: %s\n",
1065 value);
1066 return 1;
1067 }
1068 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1069 if (!value || !*value) {
1070 printk(KERN_WARNING
1071 "CIFS: invalid path prefix\n");
1072 return 1; /* needs_argument */
1073 }
1074 if ((temp_len = strnlen(value, 1024)) < 1024) {
1075 if (value[0] != '/')
1076 temp_len++; /* missing leading slash */
1077 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1078 if (vol->prepath == NULL)
1079 return 1;
1080 if (value[0] != '/') {
1081 vol->prepath[0] = '/';
1082 strcpy(vol->prepath+1, value);
1083 } else
1084 strcpy(vol->prepath, value);
1085 cFYI(1, "prefix path %s", vol->prepath);
1086 } else {
1087 printk(KERN_WARNING "CIFS: prefix too long\n");
1088 return 1;
1089 }
1090 } else if (strnicmp(data, "iocharset", 9) == 0) {
1091 if (!value || !*value) {
1092 printk(KERN_WARNING "CIFS: invalid iocharset "
1093 "specified\n");
1094 return 1; /* needs_arg; */
1095 }
1096 if (strnlen(value, 65) < 65) {
1097 if (strnicmp(value, "default", 7))
1098 vol->iocharset = value;
1099 /* if iocharset not set then load_nls_default
1100 is used by caller */
1101 cFYI(1, "iocharset set to %s", value);
1102 } else {
1103 printk(KERN_WARNING "CIFS: iocharset name "
1104 "too long.\n");
1105 return 1;
1106 }
1107 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1108 vol->linux_uid = simple_strtoul(value, &value, 0);
1109 uid_specified = true;
1110 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1111 vol->cred_uid = simple_strtoul(value, &value, 0);
1112 } else if (!strnicmp(data, "forceuid", 8)) {
1113 override_uid = 1;
1114 } else if (!strnicmp(data, "noforceuid", 10)) {
1115 override_uid = 0;
1116 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1117 vol->linux_gid = simple_strtoul(value, &value, 0);
1118 gid_specified = true;
1119 } else if (!strnicmp(data, "forcegid", 8)) {
1120 override_gid = 1;
1121 } else if (!strnicmp(data, "noforcegid", 10)) {
1122 override_gid = 0;
1123 } else if (strnicmp(data, "file_mode", 4) == 0) {
1124 if (value && *value) {
1125 vol->file_mode =
1126 simple_strtoul(value, &value, 0);
1127 }
1128 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1129 if (value && *value) {
1130 vol->dir_mode =
1131 simple_strtoul(value, &value, 0);
1132 }
1133 } else if (strnicmp(data, "dirmode", 4) == 0) {
1134 if (value && *value) {
1135 vol->dir_mode =
1136 simple_strtoul(value, &value, 0);
1137 }
1138 } else if (strnicmp(data, "port", 4) == 0) {
1139 if (value && *value) {
1140 vol->port =
1141 simple_strtoul(value, &value, 0);
1142 }
1143 } else if (strnicmp(data, "rsize", 5) == 0) {
1144 if (value && *value) {
1145 vol->rsize =
1146 simple_strtoul(value, &value, 0);
1147 }
1148 } else if (strnicmp(data, "wsize", 5) == 0) {
1149 if (value && *value) {
1150 vol->wsize =
1151 simple_strtoul(value, &value, 0);
1152 }
1153 } else if (strnicmp(data, "sockopt", 5) == 0) {
1154 if (!value || !*value) {
1155 cERROR(1, "no socket option specified");
1156 continue;
1157 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1158 vol->sockopt_tcp_nodelay = 1;
1159 }
1160 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1161 if (!value || !*value || (*value == ' ')) {
1162 cFYI(1, "invalid (empty) netbiosname");
1163 } else {
1164 memset(vol->source_rfc1001_name, 0x20,
1165 RFC1001_NAME_LEN);
1166 /*
1167 * FIXME: are there cases in which a comma can
1168 * be valid in workstation netbios name (and
1169 * need special handling)?
1170 */
1171 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1172 /* don't ucase netbiosname for user */
1173 if (value[i] == 0)
1174 break;
1175 vol->source_rfc1001_name[i] = value[i];
1176 }
1177 /* The string has 16th byte zero still from
1178 set at top of the function */
1179 if (i == RFC1001_NAME_LEN && value[i] != 0)
1180 printk(KERN_WARNING "CIFS: netbiosname"
1181 " longer than 15 truncated.\n");
1182 }
1183 } else if (strnicmp(data, "servern", 7) == 0) {
1184 /* servernetbiosname specified override *SMBSERVER */
1185 if (!value || !*value || (*value == ' ')) {
1186 cFYI(1, "empty server netbiosname specified");
1187 } else {
1188 /* last byte, type, is 0x20 for servr type */
1189 memset(vol->target_rfc1001_name, 0x20,
1190 RFC1001_NAME_LEN_WITH_NULL);
1191
1192 for (i = 0; i < 15; i++) {
1193 /* BB are there cases in which a comma can be
1194 valid in this workstation netbios name
1195 (and need special handling)? */
1196
1197 /* user or mount helper must uppercase
1198 the netbiosname */
1199 if (value[i] == 0)
1200 break;
1201 else
1202 vol->target_rfc1001_name[i] =
1203 value[i];
1204 }
1205 /* The string has 16th byte zero still from
1206 set at top of the function */
1207 if (i == RFC1001_NAME_LEN && value[i] != 0)
1208 printk(KERN_WARNING "CIFS: server net"
1209 "biosname longer than 15 truncated.\n");
1210 }
1211 } else if (strnicmp(data, "actimeo", 7) == 0) {
1212 if (value && *value) {
1213 vol->actimeo = HZ * simple_strtoul(value,
1214 &value, 0);
1215 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1216 cERROR(1, "CIFS: attribute cache"
1217 "timeout too large");
1218 return 1;
1219 }
1220 }
1221 } else if (strnicmp(data, "credentials", 4) == 0) {
1222 /* ignore */
1223 } else if (strnicmp(data, "version", 3) == 0) {
1224 /* ignore */
1225 } else if (strnicmp(data, "guest", 5) == 0) {
1226 /* ignore */
1227 } else if (strnicmp(data, "rw", 2) == 0) {
1228 /* ignore */
1229 } else if (strnicmp(data, "ro", 2) == 0) {
1230 /* ignore */
1231 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1232 vol->noblocksnd = 1;
1233 } else if (strnicmp(data, "noautotune", 10) == 0) {
1234 vol->noautotune = 1;
1235 } else if ((strnicmp(data, "suid", 4) == 0) ||
1236 (strnicmp(data, "nosuid", 6) == 0) ||
1237 (strnicmp(data, "exec", 4) == 0) ||
1238 (strnicmp(data, "noexec", 6) == 0) ||
1239 (strnicmp(data, "nodev", 5) == 0) ||
1240 (strnicmp(data, "noauto", 6) == 0) ||
1241 (strnicmp(data, "dev", 3) == 0)) {
1242 /* The mount tool or mount.cifs helper (if present)
1243 uses these opts to set flags, and the flags are read
1244 by the kernel vfs layer before we get here (ie
1245 before read super) so there is no point trying to
1246 parse these options again and set anything and it
1247 is ok to just ignore them */
1248 continue;
1249 } else if (strnicmp(data, "hard", 4) == 0) {
1250 vol->retry = 1;
1251 } else if (strnicmp(data, "soft", 4) == 0) {
1252 vol->retry = 0;
1253 } else if (strnicmp(data, "perm", 4) == 0) {
1254 vol->noperm = 0;
1255 } else if (strnicmp(data, "noperm", 6) == 0) {
1256 vol->noperm = 1;
1257 } else if (strnicmp(data, "mapchars", 8) == 0) {
1258 vol->remap = 1;
1259 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1260 vol->remap = 0;
1261 } else if (strnicmp(data, "sfu", 3) == 0) {
1262 vol->sfu_emul = 1;
1263 } else if (strnicmp(data, "nosfu", 5) == 0) {
1264 vol->sfu_emul = 0;
1265 } else if (strnicmp(data, "nodfs", 5) == 0) {
1266 vol->nodfs = 1;
1267 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1268 vol->posix_paths = 1;
1269 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1270 vol->posix_paths = 0;
1271 } else if (strnicmp(data, "nounix", 6) == 0) {
1272 vol->no_linux_ext = 1;
1273 } else if (strnicmp(data, "nolinux", 7) == 0) {
1274 vol->no_linux_ext = 1;
1275 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1276 (strnicmp(data, "ignorecase", 10) == 0)) {
1277 vol->nocase = 1;
1278 } else if (strnicmp(data, "mand", 4) == 0) {
1279 /* ignore */
1280 } else if (strnicmp(data, "nomand", 6) == 0) {
1281 /* ignore */
1282 } else if (strnicmp(data, "_netdev", 7) == 0) {
1283 /* ignore */
1284 } else if (strnicmp(data, "brl", 3) == 0) {
1285 vol->nobrl = 0;
1286 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1287 (strnicmp(data, "nolock", 6) == 0)) {
1288 vol->nobrl = 1;
1289 /* turn off mandatory locking in mode
1290 if remote locking is turned off since the
1291 local vfs will do advisory */
1292 if (vol->file_mode ==
1293 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1294 vol->file_mode = S_IALLUGO;
1295 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1296 /* will take the shorter form "forcemand" as well */
1297 /* This mount option will force use of mandatory
1298 (DOS/Windows style) byte range locks, instead of
1299 using posix advisory byte range locks, even if the
1300 Unix extensions are available and posix locks would
1301 be supported otherwise. If Unix extensions are not
1302 negotiated this has no effect since mandatory locks
1303 would be used (mandatory locks is all that those
1304 those servers support) */
1305 vol->mand_lock = 1;
1306 } else if (strnicmp(data, "setuids", 7) == 0) {
1307 vol->setuids = 1;
1308 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1309 vol->setuids = 0;
1310 } else if (strnicmp(data, "dynperm", 7) == 0) {
1311 vol->dynperm = true;
1312 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1313 vol->dynperm = false;
1314 } else if (strnicmp(data, "nohard", 6) == 0) {
1315 vol->retry = 0;
1316 } else if (strnicmp(data, "nosoft", 6) == 0) {
1317 vol->retry = 1;
1318 } else if (strnicmp(data, "nointr", 6) == 0) {
1319 vol->intr = 0;
1320 } else if (strnicmp(data, "intr", 4) == 0) {
1321 vol->intr = 1;
1322 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1323 vol->nostrictsync = 1;
1324 } else if (strnicmp(data, "strictsync", 10) == 0) {
1325 vol->nostrictsync = 0;
1326 } else if (strnicmp(data, "serverino", 7) == 0) {
1327 vol->server_ino = 1;
1328 } else if (strnicmp(data, "noserverino", 9) == 0) {
1329 vol->server_ino = 0;
1330 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1331 vol->cifs_acl = 1;
1332 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1333 vol->cifs_acl = 0;
1334 } else if (strnicmp(data, "acl", 3) == 0) {
1335 vol->no_psx_acl = 0;
1336 } else if (strnicmp(data, "noacl", 5) == 0) {
1337 vol->no_psx_acl = 1;
1338 } else if (strnicmp(data, "locallease", 6) == 0) {
1339 vol->local_lease = 1;
1340 } else if (strnicmp(data, "sign", 4) == 0) {
1341 vol->secFlg |= CIFSSEC_MUST_SIGN;
1342 } else if (strnicmp(data, "seal", 4) == 0) {
1343 /* we do not do the following in secFlags because seal
1344 is a per tree connection (mount) not a per socket
1345 or per-smb connection option in the protocol */
1346 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1347 vol->seal = 1;
1348 } else if (strnicmp(data, "direct", 6) == 0) {
1349 vol->direct_io = 1;
1350 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1351 vol->direct_io = 1;
1352 } else if (strnicmp(data, "noac", 4) == 0) {
1353 printk(KERN_WARNING "CIFS: Mount option noac not "
1354 "supported. Instead set "
1355 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1356 } else if (strnicmp(data, "fsc", 3) == 0) {
1357 #ifndef CONFIG_CIFS_FSCACHE
1358 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
1359 "kernel config option set");
1360 return 1;
1361 #endif
1362 vol->fsc = true;
1363 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1364 vol->mfsymlinks = true;
1365 } else if (strnicmp(data, "multiuser", 8) == 0) {
1366 vol->multiuser = true;
1367 } else
1368 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1369 data);
1370 }
1371 if (vol->UNC == NULL) {
1372 if (devname == NULL) {
1373 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1374 "target\n");
1375 return 1;
1376 }
1377 if ((temp_len = strnlen(devname, 300)) < 300) {
1378 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1379 if (vol->UNC == NULL)
1380 return 1;
1381 strcpy(vol->UNC, devname);
1382 if (strncmp(vol->UNC, "//", 2) == 0) {
1383 vol->UNC[0] = '\\';
1384 vol->UNC[1] = '\\';
1385 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1386 printk(KERN_WARNING "CIFS: UNC Path does not "
1387 "begin with // or \\\\ \n");
1388 return 1;
1389 }
1390 value = strpbrk(vol->UNC+2, "/\\");
1391 if (value)
1392 *value = '\\';
1393 } else {
1394 printk(KERN_WARNING "CIFS: UNC name too long\n");
1395 return 1;
1396 }
1397 }
1398
1399 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1400 cERROR(1, "Multiuser mounts currently require krb5 "
1401 "authentication!");
1402 return 1;
1403 }
1404
1405 if (vol->UNCip == NULL)
1406 vol->UNCip = &vol->UNC[2];
1407
1408 if (uid_specified)
1409 vol->override_uid = override_uid;
1410 else if (override_uid == 1)
1411 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1412 "specified with no uid= option.\n");
1413
1414 if (gid_specified)
1415 vol->override_gid = override_gid;
1416 else if (override_gid == 1)
1417 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1418 "specified with no gid= option.\n");
1419
1420 return 0;
1421 }
1422
1423 /** Returns true if srcaddr isn't specified and rhs isn't
1424 * specified, or if srcaddr is specified and
1425 * matches the IP address of the rhs argument.
1426 */
1427 static bool
1428 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1429 {
1430 switch (srcaddr->sa_family) {
1431 case AF_UNSPEC:
1432 return (rhs->sa_family == AF_UNSPEC);
1433 case AF_INET: {
1434 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1435 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1436 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1437 }
1438 case AF_INET6: {
1439 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1440 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1441 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1442 }
1443 default:
1444 WARN_ON(1);
1445 return false; /* don't expect to be here */
1446 }
1447 }
1448
1449 /*
1450 * If no port is specified in addr structure, we try to match with 445 port
1451 * and if it fails - with 139 ports. It should be called only if address
1452 * families of server and addr are equal.
1453 */
1454 static bool
1455 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1456 {
1457 unsigned short int port, *sport;
1458
1459 switch (addr->sa_family) {
1460 case AF_INET:
1461 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1462 port = ((struct sockaddr_in *) addr)->sin_port;
1463 break;
1464 case AF_INET6:
1465 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1466 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1467 break;
1468 default:
1469 WARN_ON(1);
1470 return false;
1471 }
1472
1473 if (!port) {
1474 port = htons(CIFS_PORT);
1475 if (port == *sport)
1476 return true;
1477
1478 port = htons(RFC1001_PORT);
1479 }
1480
1481 return port == *sport;
1482 }
1483
1484 static bool
1485 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1486 struct sockaddr *srcaddr)
1487 {
1488 switch (addr->sa_family) {
1489 case AF_INET: {
1490 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1491 struct sockaddr_in *srv_addr4 =
1492 (struct sockaddr_in *)&server->dstaddr;
1493
1494 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1495 return false;
1496 break;
1497 }
1498 case AF_INET6: {
1499 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1500 struct sockaddr_in6 *srv_addr6 =
1501 (struct sockaddr_in6 *)&server->dstaddr;
1502
1503 if (!ipv6_addr_equal(&addr6->sin6_addr,
1504 &srv_addr6->sin6_addr))
1505 return false;
1506 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1507 return false;
1508 break;
1509 }
1510 default:
1511 WARN_ON(1);
1512 return false; /* don't expect to be here */
1513 }
1514
1515 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1516 return false;
1517
1518 return true;
1519 }
1520
1521 static bool
1522 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1523 {
1524 unsigned int secFlags;
1525
1526 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1527 secFlags = vol->secFlg;
1528 else
1529 secFlags = global_secflags | vol->secFlg;
1530
1531 switch (server->secType) {
1532 case LANMAN:
1533 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1534 return false;
1535 break;
1536 case NTLMv2:
1537 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1538 return false;
1539 break;
1540 case NTLM:
1541 if (!(secFlags & CIFSSEC_MAY_NTLM))
1542 return false;
1543 break;
1544 case Kerberos:
1545 if (!(secFlags & CIFSSEC_MAY_KRB5))
1546 return false;
1547 break;
1548 case RawNTLMSSP:
1549 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1550 return false;
1551 break;
1552 default:
1553 /* shouldn't happen */
1554 return false;
1555 }
1556
1557 /* now check if signing mode is acceptible */
1558 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1559 (server->secMode & SECMODE_SIGN_REQUIRED))
1560 return false;
1561 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1562 (server->secMode &
1563 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1564 return false;
1565
1566 return true;
1567 }
1568
1569 static struct TCP_Server_Info *
1570 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1571 {
1572 struct TCP_Server_Info *server;
1573
1574 spin_lock(&cifs_tcp_ses_lock);
1575 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1576 if (!match_address(server, addr,
1577 (struct sockaddr *)&vol->srcaddr))
1578 continue;
1579
1580 if (!match_port(server, addr))
1581 continue;
1582
1583 if (!match_security(server, vol))
1584 continue;
1585
1586 ++server->srv_count;
1587 spin_unlock(&cifs_tcp_ses_lock);
1588 cFYI(1, "Existing tcp session with server found");
1589 return server;
1590 }
1591 spin_unlock(&cifs_tcp_ses_lock);
1592 return NULL;
1593 }
1594
1595 static void
1596 cifs_put_tcp_session(struct TCP_Server_Info *server)
1597 {
1598 struct task_struct *task;
1599
1600 spin_lock(&cifs_tcp_ses_lock);
1601 if (--server->srv_count > 0) {
1602 spin_unlock(&cifs_tcp_ses_lock);
1603 return;
1604 }
1605
1606 list_del_init(&server->tcp_ses_list);
1607 spin_unlock(&cifs_tcp_ses_lock);
1608
1609 cancel_delayed_work_sync(&server->echo);
1610
1611 spin_lock(&GlobalMid_Lock);
1612 server->tcpStatus = CifsExiting;
1613 spin_unlock(&GlobalMid_Lock);
1614
1615 cifs_crypto_shash_release(server);
1616 cifs_fscache_release_client_cookie(server);
1617
1618 kfree(server->session_key.response);
1619 server->session_key.response = NULL;
1620 server->session_key.len = 0;
1621
1622 task = xchg(&server->tsk, NULL);
1623 if (task)
1624 force_sig(SIGKILL, task);
1625 }
1626
1627 static struct TCP_Server_Info *
1628 cifs_get_tcp_session(struct smb_vol *volume_info)
1629 {
1630 struct TCP_Server_Info *tcp_ses = NULL;
1631 struct sockaddr_storage addr;
1632 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1633 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1634 int rc;
1635
1636 memset(&addr, 0, sizeof(struct sockaddr_storage));
1637
1638 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1639
1640 if (volume_info->UNCip && volume_info->UNC) {
1641 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1642 volume_info->UNCip,
1643 strlen(volume_info->UNCip),
1644 volume_info->port);
1645 if (!rc) {
1646 /* we failed translating address */
1647 rc = -EINVAL;
1648 goto out_err;
1649 }
1650 } else if (volume_info->UNCip) {
1651 /* BB using ip addr as tcp_ses name to connect to the
1652 DFS root below */
1653 cERROR(1, "Connecting to DFS root not implemented yet");
1654 rc = -EINVAL;
1655 goto out_err;
1656 } else /* which tcp_sess DFS root would we conect to */ {
1657 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1658 "unc=//192.168.1.100/public) specified");
1659 rc = -EINVAL;
1660 goto out_err;
1661 }
1662
1663 /* see if we already have a matching tcp_ses */
1664 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1665 if (tcp_ses)
1666 return tcp_ses;
1667
1668 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1669 if (!tcp_ses) {
1670 rc = -ENOMEM;
1671 goto out_err;
1672 }
1673
1674 rc = cifs_crypto_shash_allocate(tcp_ses);
1675 if (rc) {
1676 cERROR(1, "could not setup hash structures rc %d", rc);
1677 goto out_err;
1678 }
1679
1680 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1681 if (IS_ERR(tcp_ses->hostname)) {
1682 rc = PTR_ERR(tcp_ses->hostname);
1683 goto out_err_crypto_release;
1684 }
1685
1686 tcp_ses->noblocksnd = volume_info->noblocksnd;
1687 tcp_ses->noautotune = volume_info->noautotune;
1688 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1689 atomic_set(&tcp_ses->inFlight, 0);
1690 init_waitqueue_head(&tcp_ses->response_q);
1691 init_waitqueue_head(&tcp_ses->request_q);
1692 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1693 mutex_init(&tcp_ses->srv_mutex);
1694 memcpy(tcp_ses->workstation_RFC1001_name,
1695 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1696 memcpy(tcp_ses->server_RFC1001_name,
1697 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1698 tcp_ses->session_estab = false;
1699 tcp_ses->sequence_number = 0;
1700 tcp_ses->lstrp = jiffies;
1701 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1702 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1703 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1704
1705 /*
1706 * at this point we are the only ones with the pointer
1707 * to the struct since the kernel thread not created yet
1708 * no need to spinlock this init of tcpStatus or srv_count
1709 */
1710 tcp_ses->tcpStatus = CifsNew;
1711 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1712 sizeof(tcp_ses->srcaddr));
1713 ++tcp_ses->srv_count;
1714
1715 if (addr.ss_family == AF_INET6) {
1716 cFYI(1, "attempting ipv6 connect");
1717 /* BB should we allow ipv6 on port 139? */
1718 /* other OS never observed in Wild doing 139 with v6 */
1719 memcpy(&tcp_ses->dstaddr, sin_server6,
1720 sizeof(struct sockaddr_in6));
1721 } else
1722 memcpy(&tcp_ses->dstaddr, sin_server,
1723 sizeof(struct sockaddr_in));
1724
1725 rc = ip_connect(tcp_ses);
1726 if (rc < 0) {
1727 cERROR(1, "Error connecting to socket. Aborting operation");
1728 goto out_err_crypto_release;
1729 }
1730
1731 /*
1732 * since we're in a cifs function already, we know that
1733 * this will succeed. No need for try_module_get().
1734 */
1735 __module_get(THIS_MODULE);
1736 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1737 tcp_ses, "cifsd");
1738 if (IS_ERR(tcp_ses->tsk)) {
1739 rc = PTR_ERR(tcp_ses->tsk);
1740 cERROR(1, "error %d create cifsd thread", rc);
1741 module_put(THIS_MODULE);
1742 goto out_err_crypto_release;
1743 }
1744
1745 /* thread spawned, put it on the list */
1746 spin_lock(&cifs_tcp_ses_lock);
1747 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1748 spin_unlock(&cifs_tcp_ses_lock);
1749
1750 cifs_fscache_get_client_cookie(tcp_ses);
1751
1752 /* queue echo request delayed work */
1753 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1754
1755 return tcp_ses;
1756
1757 out_err_crypto_release:
1758 cifs_crypto_shash_release(tcp_ses);
1759
1760 out_err:
1761 if (tcp_ses) {
1762 if (!IS_ERR(tcp_ses->hostname))
1763 kfree(tcp_ses->hostname);
1764 if (tcp_ses->ssocket)
1765 sock_release(tcp_ses->ssocket);
1766 kfree(tcp_ses);
1767 }
1768 return ERR_PTR(rc);
1769 }
1770
1771 static struct cifsSesInfo *
1772 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1773 {
1774 struct cifsSesInfo *ses;
1775
1776 spin_lock(&cifs_tcp_ses_lock);
1777 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1778 switch (server->secType) {
1779 case Kerberos:
1780 if (vol->cred_uid != ses->cred_uid)
1781 continue;
1782 break;
1783 default:
1784 /* anything else takes username/password */
1785 if (strncmp(ses->userName, vol->username,
1786 MAX_USERNAME_SIZE))
1787 continue;
1788 if (strlen(vol->username) != 0 &&
1789 ses->password != NULL &&
1790 strncmp(ses->password,
1791 vol->password ? vol->password : "",
1792 MAX_PASSWORD_SIZE))
1793 continue;
1794 }
1795 ++ses->ses_count;
1796 spin_unlock(&cifs_tcp_ses_lock);
1797 return ses;
1798 }
1799 spin_unlock(&cifs_tcp_ses_lock);
1800 return NULL;
1801 }
1802
1803 static void
1804 cifs_put_smb_ses(struct cifsSesInfo *ses)
1805 {
1806 int xid;
1807 struct TCP_Server_Info *server = ses->server;
1808
1809 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1810 spin_lock(&cifs_tcp_ses_lock);
1811 if (--ses->ses_count > 0) {
1812 spin_unlock(&cifs_tcp_ses_lock);
1813 return;
1814 }
1815
1816 list_del_init(&ses->smb_ses_list);
1817 spin_unlock(&cifs_tcp_ses_lock);
1818
1819 if (ses->status == CifsGood) {
1820 xid = GetXid();
1821 CIFSSMBLogoff(xid, ses);
1822 _FreeXid(xid);
1823 }
1824 sesInfoFree(ses);
1825 cifs_put_tcp_session(server);
1826 }
1827
1828 static struct cifsSesInfo *
1829 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1830 {
1831 int rc = -ENOMEM, xid;
1832 struct cifsSesInfo *ses;
1833 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1834 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1835
1836 xid = GetXid();
1837
1838 ses = cifs_find_smb_ses(server, volume_info);
1839 if (ses) {
1840 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1841
1842 mutex_lock(&ses->session_mutex);
1843 rc = cifs_negotiate_protocol(xid, ses);
1844 if (rc) {
1845 mutex_unlock(&ses->session_mutex);
1846 /* problem -- put our ses reference */
1847 cifs_put_smb_ses(ses);
1848 FreeXid(xid);
1849 return ERR_PTR(rc);
1850 }
1851 if (ses->need_reconnect) {
1852 cFYI(1, "Session needs reconnect");
1853 rc = cifs_setup_session(xid, ses,
1854 volume_info->local_nls);
1855 if (rc) {
1856 mutex_unlock(&ses->session_mutex);
1857 /* problem -- put our reference */
1858 cifs_put_smb_ses(ses);
1859 FreeXid(xid);
1860 return ERR_PTR(rc);
1861 }
1862 }
1863 mutex_unlock(&ses->session_mutex);
1864
1865 /* existing SMB ses has a server reference already */
1866 cifs_put_tcp_session(server);
1867 FreeXid(xid);
1868 return ses;
1869 }
1870
1871 cFYI(1, "Existing smb sess not found");
1872 ses = sesInfoAlloc();
1873 if (ses == NULL)
1874 goto get_ses_fail;
1875
1876 /* new SMB session uses our server ref */
1877 ses->server = server;
1878 if (server->dstaddr.ss_family == AF_INET6)
1879 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1880 else
1881 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1882
1883 if (volume_info->username)
1884 strncpy(ses->userName, volume_info->username,
1885 MAX_USERNAME_SIZE);
1886
1887 /* volume_info->password freed at unmount */
1888 if (volume_info->password) {
1889 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1890 if (!ses->password)
1891 goto get_ses_fail;
1892 }
1893 if (volume_info->domainname) {
1894 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1895 if (!ses->domainName)
1896 goto get_ses_fail;
1897 }
1898 ses->cred_uid = volume_info->cred_uid;
1899 ses->linux_uid = volume_info->linux_uid;
1900 ses->overrideSecFlg = volume_info->secFlg;
1901
1902 mutex_lock(&ses->session_mutex);
1903 rc = cifs_negotiate_protocol(xid, ses);
1904 if (!rc)
1905 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1906 mutex_unlock(&ses->session_mutex);
1907 if (rc)
1908 goto get_ses_fail;
1909
1910 /* success, put it on the list */
1911 spin_lock(&cifs_tcp_ses_lock);
1912 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1913 spin_unlock(&cifs_tcp_ses_lock);
1914
1915 FreeXid(xid);
1916 return ses;
1917
1918 get_ses_fail:
1919 sesInfoFree(ses);
1920 FreeXid(xid);
1921 return ERR_PTR(rc);
1922 }
1923
1924 static struct cifsTconInfo *
1925 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1926 {
1927 struct list_head *tmp;
1928 struct cifsTconInfo *tcon;
1929
1930 spin_lock(&cifs_tcp_ses_lock);
1931 list_for_each(tmp, &ses->tcon_list) {
1932 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1933 if (tcon->tidStatus == CifsExiting)
1934 continue;
1935 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1936 continue;
1937
1938 ++tcon->tc_count;
1939 spin_unlock(&cifs_tcp_ses_lock);
1940 return tcon;
1941 }
1942 spin_unlock(&cifs_tcp_ses_lock);
1943 return NULL;
1944 }
1945
1946 static void
1947 cifs_put_tcon(struct cifsTconInfo *tcon)
1948 {
1949 int xid;
1950 struct cifsSesInfo *ses = tcon->ses;
1951
1952 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1953 spin_lock(&cifs_tcp_ses_lock);
1954 if (--tcon->tc_count > 0) {
1955 spin_unlock(&cifs_tcp_ses_lock);
1956 return;
1957 }
1958
1959 list_del_init(&tcon->tcon_list);
1960 spin_unlock(&cifs_tcp_ses_lock);
1961
1962 xid = GetXid();
1963 CIFSSMBTDis(xid, tcon);
1964 _FreeXid(xid);
1965
1966 cifs_fscache_release_super_cookie(tcon);
1967 tconInfoFree(tcon);
1968 cifs_put_smb_ses(ses);
1969 }
1970
1971 static struct cifsTconInfo *
1972 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1973 {
1974 int rc, xid;
1975 struct cifsTconInfo *tcon;
1976
1977 tcon = cifs_find_tcon(ses, volume_info->UNC);
1978 if (tcon) {
1979 cFYI(1, "Found match on UNC path");
1980 /* existing tcon already has a reference */
1981 cifs_put_smb_ses(ses);
1982 if (tcon->seal != volume_info->seal)
1983 cERROR(1, "transport encryption setting "
1984 "conflicts with existing tid");
1985 return tcon;
1986 }
1987
1988 tcon = tconInfoAlloc();
1989 if (tcon == NULL) {
1990 rc = -ENOMEM;
1991 goto out_fail;
1992 }
1993
1994 tcon->ses = ses;
1995 if (volume_info->password) {
1996 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1997 if (!tcon->password) {
1998 rc = -ENOMEM;
1999 goto out_fail;
2000 }
2001 }
2002
2003 if (strchr(volume_info->UNC + 3, '\\') == NULL
2004 && strchr(volume_info->UNC + 3, '/') == NULL) {
2005 cERROR(1, "Missing share name");
2006 rc = -ENODEV;
2007 goto out_fail;
2008 }
2009
2010 /* BB Do we need to wrap session_mutex around
2011 * this TCon call and Unix SetFS as
2012 * we do on SessSetup and reconnect? */
2013 xid = GetXid();
2014 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2015 FreeXid(xid);
2016 cFYI(1, "CIFS Tcon rc = %d", rc);
2017 if (rc)
2018 goto out_fail;
2019
2020 if (volume_info->nodfs) {
2021 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2022 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2023 }
2024 tcon->seal = volume_info->seal;
2025 /* we can have only one retry value for a connection
2026 to a share so for resources mounted more than once
2027 to the same server share the last value passed in
2028 for the retry flag is used */
2029 tcon->retry = volume_info->retry;
2030 tcon->nocase = volume_info->nocase;
2031 tcon->local_lease = volume_info->local_lease;
2032
2033 spin_lock(&cifs_tcp_ses_lock);
2034 list_add(&tcon->tcon_list, &ses->tcon_list);
2035 spin_unlock(&cifs_tcp_ses_lock);
2036
2037 cifs_fscache_get_super_cookie(tcon);
2038
2039 return tcon;
2040
2041 out_fail:
2042 tconInfoFree(tcon);
2043 return ERR_PTR(rc);
2044 }
2045
2046 void
2047 cifs_put_tlink(struct tcon_link *tlink)
2048 {
2049 if (!tlink || IS_ERR(tlink))
2050 return;
2051
2052 if (!atomic_dec_and_test(&tlink->tl_count) ||
2053 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2054 tlink->tl_time = jiffies;
2055 return;
2056 }
2057
2058 if (!IS_ERR(tlink_tcon(tlink)))
2059 cifs_put_tcon(tlink_tcon(tlink));
2060 kfree(tlink);
2061 return;
2062 }
2063
2064 int
2065 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2066 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2067 struct dfs_info3_param **preferrals, int remap)
2068 {
2069 char *temp_unc;
2070 int rc = 0;
2071
2072 *pnum_referrals = 0;
2073 *preferrals = NULL;
2074
2075 if (pSesInfo->ipc_tid == 0) {
2076 temp_unc = kmalloc(2 /* for slashes */ +
2077 strnlen(pSesInfo->serverName,
2078 SERVER_NAME_LEN_WITH_NULL * 2)
2079 + 1 + 4 /* slash IPC$ */ + 2,
2080 GFP_KERNEL);
2081 if (temp_unc == NULL)
2082 return -ENOMEM;
2083 temp_unc[0] = '\\';
2084 temp_unc[1] = '\\';
2085 strcpy(temp_unc + 2, pSesInfo->serverName);
2086 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2087 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2088 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2089 kfree(temp_unc);
2090 }
2091 if (rc == 0)
2092 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2093 pnum_referrals, nls_codepage, remap);
2094 /* BB map targetUNCs to dfs_info3 structures, here or
2095 in CIFSGetDFSRefer BB */
2096
2097 return rc;
2098 }
2099
2100 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2101 static struct lock_class_key cifs_key[2];
2102 static struct lock_class_key cifs_slock_key[2];
2103
2104 static inline void
2105 cifs_reclassify_socket4(struct socket *sock)
2106 {
2107 struct sock *sk = sock->sk;
2108 BUG_ON(sock_owned_by_user(sk));
2109 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2110 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2111 }
2112
2113 static inline void
2114 cifs_reclassify_socket6(struct socket *sock)
2115 {
2116 struct sock *sk = sock->sk;
2117 BUG_ON(sock_owned_by_user(sk));
2118 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2119 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2120 }
2121 #else
2122 static inline void
2123 cifs_reclassify_socket4(struct socket *sock)
2124 {
2125 }
2126
2127 static inline void
2128 cifs_reclassify_socket6(struct socket *sock)
2129 {
2130 }
2131 #endif
2132
2133 /* See RFC1001 section 14 on representation of Netbios names */
2134 static void rfc1002mangle(char *target, char *source, unsigned int length)
2135 {
2136 unsigned int i, j;
2137
2138 for (i = 0, j = 0; i < (length); i++) {
2139 /* mask a nibble at a time and encode */
2140 target[j] = 'A' + (0x0F & (source[i] >> 4));
2141 target[j+1] = 'A' + (0x0F & source[i]);
2142 j += 2;
2143 }
2144
2145 }
2146
2147 static int
2148 bind_socket(struct TCP_Server_Info *server)
2149 {
2150 int rc = 0;
2151 if (server->srcaddr.ss_family != AF_UNSPEC) {
2152 /* Bind to the specified local IP address */
2153 struct socket *socket = server->ssocket;
2154 rc = socket->ops->bind(socket,
2155 (struct sockaddr *) &server->srcaddr,
2156 sizeof(server->srcaddr));
2157 if (rc < 0) {
2158 struct sockaddr_in *saddr4;
2159 struct sockaddr_in6 *saddr6;
2160 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2161 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2162 if (saddr6->sin6_family == AF_INET6)
2163 cERROR(1, "cifs: "
2164 "Failed to bind to: %pI6c, error: %d\n",
2165 &saddr6->sin6_addr, rc);
2166 else
2167 cERROR(1, "cifs: "
2168 "Failed to bind to: %pI4, error: %d\n",
2169 &saddr4->sin_addr.s_addr, rc);
2170 }
2171 }
2172 return rc;
2173 }
2174
2175 static int
2176 ip_rfc1001_connect(struct TCP_Server_Info *server)
2177 {
2178 int rc = 0;
2179 /*
2180 * some servers require RFC1001 sessinit before sending
2181 * negprot - BB check reconnection in case where second
2182 * sessinit is sent but no second negprot
2183 */
2184 struct rfc1002_session_packet *ses_init_buf;
2185 struct smb_hdr *smb_buf;
2186 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2187 GFP_KERNEL);
2188 if (ses_init_buf) {
2189 ses_init_buf->trailer.session_req.called_len = 32;
2190
2191 if (server->server_RFC1001_name &&
2192 server->server_RFC1001_name[0] != 0)
2193 rfc1002mangle(ses_init_buf->trailer.
2194 session_req.called_name,
2195 server->server_RFC1001_name,
2196 RFC1001_NAME_LEN_WITH_NULL);
2197 else
2198 rfc1002mangle(ses_init_buf->trailer.
2199 session_req.called_name,
2200 DEFAULT_CIFS_CALLED_NAME,
2201 RFC1001_NAME_LEN_WITH_NULL);
2202
2203 ses_init_buf->trailer.session_req.calling_len = 32;
2204
2205 /*
2206 * calling name ends in null (byte 16) from old smb
2207 * convention.
2208 */
2209 if (server->workstation_RFC1001_name &&
2210 server->workstation_RFC1001_name[0] != 0)
2211 rfc1002mangle(ses_init_buf->trailer.
2212 session_req.calling_name,
2213 server->workstation_RFC1001_name,
2214 RFC1001_NAME_LEN_WITH_NULL);
2215 else
2216 rfc1002mangle(ses_init_buf->trailer.
2217 session_req.calling_name,
2218 "LINUX_CIFS_CLNT",
2219 RFC1001_NAME_LEN_WITH_NULL);
2220
2221 ses_init_buf->trailer.session_req.scope1 = 0;
2222 ses_init_buf->trailer.session_req.scope2 = 0;
2223 smb_buf = (struct smb_hdr *)ses_init_buf;
2224
2225 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2226 smb_buf->smb_buf_length = 0x81000044;
2227 rc = smb_send(server, smb_buf, 0x44);
2228 kfree(ses_init_buf);
2229 /*
2230 * RFC1001 layer in at least one server
2231 * requires very short break before negprot
2232 * presumably because not expecting negprot
2233 * to follow so fast. This is a simple
2234 * solution that works without
2235 * complicating the code and causes no
2236 * significant slowing down on mount
2237 * for everyone else
2238 */
2239 usleep_range(1000, 2000);
2240 }
2241 /*
2242 * else the negprot may still work without this
2243 * even though malloc failed
2244 */
2245
2246 return rc;
2247 }
2248
2249 static int
2250 generic_ip_connect(struct TCP_Server_Info *server)
2251 {
2252 int rc = 0;
2253 unsigned short int sport;
2254 int slen, sfamily;
2255 struct socket *socket = server->ssocket;
2256 struct sockaddr *saddr;
2257
2258 saddr = (struct sockaddr *) &server->dstaddr;
2259
2260 if (server->dstaddr.ss_family == AF_INET6) {
2261 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2262 slen = sizeof(struct sockaddr_in6);
2263 sfamily = AF_INET6;
2264 } else {
2265 sport = ((struct sockaddr_in *) saddr)->sin_port;
2266 slen = sizeof(struct sockaddr_in);
2267 sfamily = AF_INET;
2268 }
2269
2270 if (socket == NULL) {
2271 rc = sock_create_kern(sfamily, SOCK_STREAM,
2272 IPPROTO_TCP, &socket);
2273 if (rc < 0) {
2274 cERROR(1, "Error %d creating socket", rc);
2275 server->ssocket = NULL;
2276 return rc;
2277 }
2278
2279 /* BB other socket options to set KEEPALIVE, NODELAY? */
2280 cFYI(1, "Socket created");
2281 server->ssocket = socket;
2282 socket->sk->sk_allocation = GFP_NOFS;
2283 if (sfamily == AF_INET6)
2284 cifs_reclassify_socket6(socket);
2285 else
2286 cifs_reclassify_socket4(socket);
2287 }
2288
2289 rc = bind_socket(server);
2290 if (rc < 0)
2291 return rc;
2292
2293 rc = socket->ops->connect(socket, saddr, slen, 0);
2294 if (rc < 0) {
2295 cFYI(1, "Error %d connecting to server", rc);
2296 sock_release(socket);
2297 server->ssocket = NULL;
2298 return rc;
2299 }
2300
2301 /*
2302 * Eventually check for other socket options to change from
2303 * the default. sock_setsockopt not used because it expects
2304 * user space buffer
2305 */
2306 socket->sk->sk_rcvtimeo = 7 * HZ;
2307 socket->sk->sk_sndtimeo = 5 * HZ;
2308
2309 /* make the bufsizes depend on wsize/rsize and max requests */
2310 if (server->noautotune) {
2311 if (socket->sk->sk_sndbuf < (200 * 1024))
2312 socket->sk->sk_sndbuf = 200 * 1024;
2313 if (socket->sk->sk_rcvbuf < (140 * 1024))
2314 socket->sk->sk_rcvbuf = 140 * 1024;
2315 }
2316
2317 if (server->tcp_nodelay) {
2318 int val = 1;
2319 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2320 (char *)&val, sizeof(val));
2321 if (rc)
2322 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2323 }
2324
2325 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2326 socket->sk->sk_sndbuf,
2327 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2328
2329 if (sport == htons(RFC1001_PORT))
2330 rc = ip_rfc1001_connect(server);
2331
2332 return rc;
2333 }
2334
2335 static int
2336 ip_connect(struct TCP_Server_Info *server)
2337 {
2338 unsigned short int *sport;
2339 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2340 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2341
2342 if (server->dstaddr.ss_family == AF_INET6)
2343 sport = &addr6->sin6_port;
2344 else
2345 sport = &addr->sin_port;
2346
2347 if (*sport == 0) {
2348 int rc;
2349
2350 /* try with 445 port at first */
2351 *sport = htons(CIFS_PORT);
2352
2353 rc = generic_ip_connect(server);
2354 if (rc >= 0)
2355 return rc;
2356
2357 /* if it failed, try with 139 port */
2358 *sport = htons(RFC1001_PORT);
2359 }
2360
2361 return generic_ip_connect(server);
2362 }
2363
2364 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2365 struct super_block *sb, struct smb_vol *vol_info)
2366 {
2367 /* if we are reconnecting then should we check to see if
2368 * any requested capabilities changed locally e.g. via
2369 * remount but we can not do much about it here
2370 * if they have (even if we could detect it by the following)
2371 * Perhaps we could add a backpointer to array of sb from tcon
2372 * or if we change to make all sb to same share the same
2373 * sb as NFS - then we only have one backpointer to sb.
2374 * What if we wanted to mount the server share twice once with
2375 * and once without posixacls or posix paths? */
2376 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2377
2378 if (vol_info && vol_info->no_linux_ext) {
2379 tcon->fsUnixInfo.Capability = 0;
2380 tcon->unix_ext = 0; /* Unix Extensions disabled */
2381 cFYI(1, "Linux protocol extensions disabled");
2382 return;
2383 } else if (vol_info)
2384 tcon->unix_ext = 1; /* Unix Extensions supported */
2385
2386 if (tcon->unix_ext == 0) {
2387 cFYI(1, "Unix extensions disabled so not set on reconnect");
2388 return;
2389 }
2390
2391 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2392 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2393
2394 /* check for reconnect case in which we do not
2395 want to change the mount behavior if we can avoid it */
2396 if (vol_info == NULL) {
2397 /* turn off POSIX ACL and PATHNAMES if not set
2398 originally at mount time */
2399 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2400 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2401 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2402 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2403 cERROR(1, "POSIXPATH support change");
2404 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2405 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2406 cERROR(1, "possible reconnect error");
2407 cERROR(1, "server disabled POSIX path support");
2408 }
2409 }
2410
2411 cap &= CIFS_UNIX_CAP_MASK;
2412 if (vol_info && vol_info->no_psx_acl)
2413 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2414 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2415 cFYI(1, "negotiated posix acl support");
2416 if (sb)
2417 sb->s_flags |= MS_POSIXACL;
2418 }
2419
2420 if (vol_info && vol_info->posix_paths == 0)
2421 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2422 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2423 cFYI(1, "negotiate posix pathnames");
2424 if (sb)
2425 CIFS_SB(sb)->mnt_cifs_flags |=
2426 CIFS_MOUNT_POSIX_PATHS;
2427 }
2428
2429 /* We might be setting the path sep back to a different
2430 form if we are reconnecting and the server switched its
2431 posix path capability for this share */
2432 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2433 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2434
2435 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2436 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2437 CIFS_SB(sb)->rsize = 127 * 1024;
2438 cFYI(DBG2, "larger reads not supported by srv");
2439 }
2440 }
2441
2442
2443 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2444 #ifdef CONFIG_CIFS_DEBUG2
2445 if (cap & CIFS_UNIX_FCNTL_CAP)
2446 cFYI(1, "FCNTL cap");
2447 if (cap & CIFS_UNIX_EXTATTR_CAP)
2448 cFYI(1, "EXTATTR cap");
2449 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2450 cFYI(1, "POSIX path cap");
2451 if (cap & CIFS_UNIX_XATTR_CAP)
2452 cFYI(1, "XATTR cap");
2453 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2454 cFYI(1, "POSIX ACL cap");
2455 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2456 cFYI(1, "very large read cap");
2457 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2458 cFYI(1, "very large write cap");
2459 #endif /* CIFS_DEBUG2 */
2460 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2461 if (vol_info == NULL) {
2462 cFYI(1, "resetting capabilities failed");
2463 } else
2464 cERROR(1, "Negotiating Unix capabilities "
2465 "with the server failed. Consider "
2466 "mounting with the Unix Extensions\n"
2467 "disabled, if problems are found, "
2468 "by specifying the nounix mount "
2469 "option.");
2470
2471 }
2472 }
2473 }
2474
2475 static void
2476 convert_delimiter(char *path, char delim)
2477 {
2478 int i;
2479 char old_delim;
2480
2481 if (path == NULL)
2482 return;
2483
2484 if (delim == '/')
2485 old_delim = '\\';
2486 else
2487 old_delim = '/';
2488
2489 for (i = 0; path[i] != '\0'; i++) {
2490 if (path[i] == old_delim)
2491 path[i] = delim;
2492 }
2493 }
2494
2495 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2496 struct cifs_sb_info *cifs_sb)
2497 {
2498 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2499
2500 if (pvolume_info->rsize > CIFSMaxBufSize) {
2501 cERROR(1, "rsize %d too large, using MaxBufSize",
2502 pvolume_info->rsize);
2503 cifs_sb->rsize = CIFSMaxBufSize;
2504 } else if ((pvolume_info->rsize) &&
2505 (pvolume_info->rsize <= CIFSMaxBufSize))
2506 cifs_sb->rsize = pvolume_info->rsize;
2507 else /* default */
2508 cifs_sb->rsize = CIFSMaxBufSize;
2509
2510 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2511 cERROR(1, "wsize %d too large, using 4096 instead",
2512 pvolume_info->wsize);
2513 cifs_sb->wsize = 4096;
2514 } else if (pvolume_info->wsize)
2515 cifs_sb->wsize = pvolume_info->wsize;
2516 else
2517 cifs_sb->wsize = min_t(const int,
2518 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2519 127*1024);
2520 /* old default of CIFSMaxBufSize was too small now
2521 that SMB Write2 can send multiple pages in kvec.
2522 RFC1001 does not describe what happens when frame
2523 bigger than 128K is sent so use that as max in
2524 conjunction with 52K kvec constraint on arch with 4K
2525 page size */
2526
2527 if (cifs_sb->rsize < 2048) {
2528 cifs_sb->rsize = 2048;
2529 /* Windows ME may prefer this */
2530 cFYI(1, "readsize set to minimum: 2048");
2531 }
2532 /* calculate prepath */
2533 cifs_sb->prepath = pvolume_info->prepath;
2534 if (cifs_sb->prepath) {
2535 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2536 /* we can not convert the / to \ in the path
2537 separators in the prefixpath yet because we do not
2538 know (until reset_cifs_unix_caps is called later)
2539 whether POSIX PATH CAP is available. We normalize
2540 the / to \ after reset_cifs_unix_caps is called */
2541 pvolume_info->prepath = NULL;
2542 } else
2543 cifs_sb->prepathlen = 0;
2544 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2545 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2546 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2547 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2548 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2549 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2550
2551 cifs_sb->actimeo = pvolume_info->actimeo;
2552
2553 if (pvolume_info->noperm)
2554 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2555 if (pvolume_info->setuids)
2556 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2557 if (pvolume_info->server_ino)
2558 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2559 if (pvolume_info->remap)
2560 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2561 if (pvolume_info->no_xattr)
2562 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2563 if (pvolume_info->sfu_emul)
2564 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2565 if (pvolume_info->nobrl)
2566 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2567 if (pvolume_info->nostrictsync)
2568 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2569 if (pvolume_info->mand_lock)
2570 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2571 if (pvolume_info->cifs_acl)
2572 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2573 if (pvolume_info->override_uid)
2574 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2575 if (pvolume_info->override_gid)
2576 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2577 if (pvolume_info->dynperm)
2578 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2579 if (pvolume_info->fsc)
2580 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2581 if (pvolume_info->multiuser)
2582 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2583 CIFS_MOUNT_NO_PERM);
2584 if (pvolume_info->direct_io) {
2585 cFYI(1, "mounting share using direct i/o");
2586 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2587 }
2588 if (pvolume_info->mfsymlinks) {
2589 if (pvolume_info->sfu_emul) {
2590 cERROR(1, "mount option mfsymlinks ignored if sfu "
2591 "mount option is used");
2592 } else {
2593 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2594 }
2595 }
2596
2597 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2598 cERROR(1, "mount option dynperm ignored if cifsacl "
2599 "mount option supported");
2600 }
2601
2602 static int
2603 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2604 struct cifs_sb_info *cifs_sb, const char *full_path)
2605 {
2606 int rc;
2607 FILE_ALL_INFO *pfile_info;
2608
2609 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2610 if (pfile_info == NULL)
2611 return -ENOMEM;
2612
2613 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2614 0 /* not legacy */, cifs_sb->local_nls,
2615 cifs_sb->mnt_cifs_flags &
2616 CIFS_MOUNT_MAP_SPECIAL_CHR);
2617 kfree(pfile_info);
2618 return rc;
2619 }
2620
2621 static void
2622 cleanup_volume_info(struct smb_vol **pvolume_info)
2623 {
2624 struct smb_vol *volume_info;
2625
2626 if (!pvolume_info || !*pvolume_info)
2627 return;
2628
2629 volume_info = *pvolume_info;
2630 kzfree(volume_info->password);
2631 kfree(volume_info->UNC);
2632 kfree(volume_info->prepath);
2633 kfree(volume_info);
2634 *pvolume_info = NULL;
2635 return;
2636 }
2637
2638 #ifdef CONFIG_CIFS_DFS_UPCALL
2639 /* build_path_to_root returns full path to root when
2640 * we do not have an exiting connection (tcon) */
2641 static char *
2642 build_unc_path_to_root(const struct smb_vol *volume_info,
2643 const struct cifs_sb_info *cifs_sb)
2644 {
2645 char *full_path;
2646
2647 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2648 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2649 if (full_path == NULL)
2650 return ERR_PTR(-ENOMEM);
2651
2652 strncpy(full_path, volume_info->UNC, unc_len);
2653 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2654 int i;
2655 for (i = 0; i < unc_len; i++) {
2656 if (full_path[i] == '\\')
2657 full_path[i] = '/';
2658 }
2659 }
2660
2661 if (cifs_sb->prepathlen)
2662 strncpy(full_path + unc_len, cifs_sb->prepath,
2663 cifs_sb->prepathlen);
2664
2665 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2666 return full_path;
2667 }
2668 #endif
2669
2670 int
2671 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2672 char *mount_data_global, const char *devname)
2673 {
2674 int rc;
2675 int xid;
2676 struct smb_vol *volume_info;
2677 struct cifsSesInfo *pSesInfo;
2678 struct cifsTconInfo *tcon;
2679 struct TCP_Server_Info *srvTcp;
2680 char *full_path;
2681 char *mount_data = mount_data_global;
2682 struct tcon_link *tlink;
2683 #ifdef CONFIG_CIFS_DFS_UPCALL
2684 struct dfs_info3_param *referrals = NULL;
2685 unsigned int num_referrals = 0;
2686 int referral_walks_count = 0;
2687 try_mount_again:
2688 #endif
2689 rc = 0;
2690 tcon = NULL;
2691 pSesInfo = NULL;
2692 srvTcp = NULL;
2693 full_path = NULL;
2694 tlink = NULL;
2695
2696 xid = GetXid();
2697
2698 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2699 if (!volume_info) {
2700 rc = -ENOMEM;
2701 goto out;
2702 }
2703
2704 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2705 rc = -EINVAL;
2706 goto out;
2707 }
2708
2709 if (volume_info->nullauth) {
2710 cFYI(1, "null user");
2711 volume_info->username = "";
2712 } else if (volume_info->username) {
2713 /* BB fixme parse for domain name here */
2714 cFYI(1, "Username: %s", volume_info->username);
2715 } else {
2716 cifserror("No username specified");
2717 /* In userspace mount helper we can get user name from alternate
2718 locations such as env variables and files on disk */
2719 rc = -EINVAL;
2720 goto out;
2721 }
2722
2723 /* this is needed for ASCII cp to Unicode converts */
2724 if (volume_info->iocharset == NULL) {
2725 /* load_nls_default cannot return null */
2726 volume_info->local_nls = load_nls_default();
2727 } else {
2728 volume_info->local_nls = load_nls(volume_info->iocharset);
2729 if (volume_info->local_nls == NULL) {
2730 cERROR(1, "CIFS mount error: iocharset %s not found",
2731 volume_info->iocharset);
2732 rc = -ELIBACC;
2733 goto out;
2734 }
2735 }
2736 cifs_sb->local_nls = volume_info->local_nls;
2737
2738 /* get a reference to a tcp session */
2739 srvTcp = cifs_get_tcp_session(volume_info);
2740 if (IS_ERR(srvTcp)) {
2741 rc = PTR_ERR(srvTcp);
2742 goto out;
2743 }
2744
2745 /* get a reference to a SMB session */
2746 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2747 if (IS_ERR(pSesInfo)) {
2748 rc = PTR_ERR(pSesInfo);
2749 pSesInfo = NULL;
2750 goto mount_fail_check;
2751 }
2752
2753 setup_cifs_sb(volume_info, cifs_sb);
2754 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2755 sb->s_maxbytes = MAX_LFS_FILESIZE;
2756 else
2757 sb->s_maxbytes = MAX_NON_LFS;
2758
2759 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2760 sb->s_time_gran = 100;
2761
2762 /* search for existing tcon to this server share */
2763 tcon = cifs_get_tcon(pSesInfo, volume_info);
2764 if (IS_ERR(tcon)) {
2765 rc = PTR_ERR(tcon);
2766 tcon = NULL;
2767 goto remote_path_check;
2768 }
2769
2770 /* do not care if following two calls succeed - informational */
2771 if (!tcon->ipc) {
2772 CIFSSMBQFSDeviceInfo(xid, tcon);
2773 CIFSSMBQFSAttributeInfo(xid, tcon);
2774 }
2775
2776 /* tell server which Unix caps we support */
2777 if (tcon->ses->capabilities & CAP_UNIX)
2778 /* reset of caps checks mount to see if unix extensions
2779 disabled for just this mount */
2780 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2781 else
2782 tcon->unix_ext = 0; /* server does not support them */
2783
2784 /* convert forward to back slashes in prepath here if needed */
2785 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2786 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2787
2788 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2789 cifs_sb->rsize = 1024 * 127;
2790 cFYI(DBG2, "no very large read support, rsize now 127K");
2791 }
2792 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2793 cifs_sb->wsize = min(cifs_sb->wsize,
2794 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2795 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2796 cifs_sb->rsize = min(cifs_sb->rsize,
2797 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2798
2799 remote_path_check:
2800 /* check if a whole path (including prepath) is not remote */
2801 if (!rc && cifs_sb->prepathlen && tcon) {
2802 /* build_path_to_root works only when we have a valid tcon */
2803 full_path = cifs_build_path_to_root(cifs_sb, tcon);
2804 if (full_path == NULL) {
2805 rc = -ENOMEM;
2806 goto mount_fail_check;
2807 }
2808 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2809 if (rc != 0 && rc != -EREMOTE) {
2810 kfree(full_path);
2811 goto mount_fail_check;
2812 }
2813 kfree(full_path);
2814 }
2815
2816 /* get referral if needed */
2817 if (rc == -EREMOTE) {
2818 #ifdef CONFIG_CIFS_DFS_UPCALL
2819 if (referral_walks_count > MAX_NESTED_LINKS) {
2820 /*
2821 * BB: when we implement proper loop detection,
2822 * we will remove this check. But now we need it
2823 * to prevent an indefinite loop if 'DFS tree' is
2824 * misconfigured (i.e. has loops).
2825 */
2826 rc = -ELOOP;
2827 goto mount_fail_check;
2828 }
2829 /* convert forward to back slashes in prepath here if needed */
2830 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2831 convert_delimiter(cifs_sb->prepath,
2832 CIFS_DIR_SEP(cifs_sb));
2833 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2834 if (IS_ERR(full_path)) {
2835 rc = PTR_ERR(full_path);
2836 goto mount_fail_check;
2837 }
2838
2839 cFYI(1, "Getting referral for: %s", full_path);
2840 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2841 cifs_sb->local_nls, &num_referrals, &referrals,
2842 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2843 if (!rc && num_referrals > 0) {
2844 char *fake_devname = NULL;
2845
2846 if (mount_data != mount_data_global)
2847 kfree(mount_data);
2848
2849 mount_data = cifs_compose_mount_options(
2850 cifs_sb->mountdata, full_path + 1,
2851 referrals, &fake_devname);
2852
2853 free_dfs_info_array(referrals, num_referrals);
2854 kfree(fake_devname);
2855 kfree(full_path);
2856
2857 if (IS_ERR(mount_data)) {
2858 rc = PTR_ERR(mount_data);
2859 mount_data = NULL;
2860 goto mount_fail_check;
2861 }
2862
2863 if (tcon)
2864 cifs_put_tcon(tcon);
2865 else if (pSesInfo)
2866 cifs_put_smb_ses(pSesInfo);
2867
2868 cleanup_volume_info(&volume_info);
2869 referral_walks_count++;
2870 FreeXid(xid);
2871 goto try_mount_again;
2872 }
2873 #else /* No DFS support, return error on mount */
2874 rc = -EOPNOTSUPP;
2875 #endif
2876 }
2877
2878 if (rc)
2879 goto mount_fail_check;
2880
2881 /* now, hang the tcon off of the superblock */
2882 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2883 if (tlink == NULL) {
2884 rc = -ENOMEM;
2885 goto mount_fail_check;
2886 }
2887
2888 tlink->tl_uid = pSesInfo->linux_uid;
2889 tlink->tl_tcon = tcon;
2890 tlink->tl_time = jiffies;
2891 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2892 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2893
2894 cifs_sb->master_tlink = tlink;
2895 spin_lock(&cifs_sb->tlink_tree_lock);
2896 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
2897 spin_unlock(&cifs_sb->tlink_tree_lock);
2898
2899 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
2900 TLINK_IDLE_EXPIRE);
2901
2902 mount_fail_check:
2903 /* on error free sesinfo and tcon struct if needed */
2904 if (rc) {
2905 if (mount_data != mount_data_global)
2906 kfree(mount_data);
2907 /* If find_unc succeeded then rc == 0 so we can not end */
2908 /* up accidently freeing someone elses tcon struct */
2909 if (tcon)
2910 cifs_put_tcon(tcon);
2911 else if (pSesInfo)
2912 cifs_put_smb_ses(pSesInfo);
2913 else
2914 cifs_put_tcp_session(srvTcp);
2915 goto out;
2916 }
2917
2918 /* volume_info->password is freed above when existing session found
2919 (in which case it is not needed anymore) but when new sesion is created
2920 the password ptr is put in the new session structure (in which case the
2921 password will be freed at unmount time) */
2922 out:
2923 /* zero out password before freeing */
2924 cleanup_volume_info(&volume_info);
2925 FreeXid(xid);
2926 return rc;
2927 }
2928
2929 int
2930 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2931 const char *tree, struct cifsTconInfo *tcon,
2932 const struct nls_table *nls_codepage)
2933 {
2934 struct smb_hdr *smb_buffer;
2935 struct smb_hdr *smb_buffer_response;
2936 TCONX_REQ *pSMB;
2937 TCONX_RSP *pSMBr;
2938 unsigned char *bcc_ptr;
2939 int rc = 0;
2940 int length, bytes_left;
2941 __u16 count;
2942
2943 if (ses == NULL)
2944 return -EIO;
2945
2946 smb_buffer = cifs_buf_get();
2947 if (smb_buffer == NULL)
2948 return -ENOMEM;
2949
2950 smb_buffer_response = smb_buffer;
2951
2952 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2953 NULL /*no tid */ , 4 /*wct */ );
2954
2955 smb_buffer->Mid = GetNextMid(ses->server);
2956 smb_buffer->Uid = ses->Suid;
2957 pSMB = (TCONX_REQ *) smb_buffer;
2958 pSMBr = (TCONX_RSP *) smb_buffer_response;
2959
2960 pSMB->AndXCommand = 0xFF;
2961 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2962 bcc_ptr = &pSMB->Password[0];
2963 if ((ses->server->secMode) & SECMODE_USER) {
2964 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2965 *bcc_ptr = 0; /* password is null byte */
2966 bcc_ptr++; /* skip password */
2967 /* already aligned so no need to do it below */
2968 } else {
2969 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
2970 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2971 specified as required (when that support is added to
2972 the vfs in the future) as only NTLM or the much
2973 weaker LANMAN (which we do not send by default) is accepted
2974 by Samba (not sure whether other servers allow
2975 NTLMv2 password here) */
2976 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2977 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2978 (ses->server->secType == LANMAN))
2979 calc_lanman_hash(tcon->password, ses->server->cryptkey,
2980 ses->server->secMode &
2981 SECMODE_PW_ENCRYPT ? true : false,
2982 bcc_ptr);
2983 else
2984 #endif /* CIFS_WEAK_PW_HASH */
2985 SMBNTencrypt(tcon->password, ses->server->cryptkey, bcc_ptr);
2986
2987 bcc_ptr += CIFS_AUTH_RESP_SIZE;
2988 if (ses->capabilities & CAP_UNICODE) {
2989 /* must align unicode strings */
2990 *bcc_ptr = 0; /* null byte password */
2991 bcc_ptr++;
2992 }
2993 }
2994
2995 if (ses->server->secMode &
2996 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2997 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2998
2999 if (ses->capabilities & CAP_STATUS32) {
3000 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3001 }
3002 if (ses->capabilities & CAP_DFS) {
3003 smb_buffer->Flags2 |= SMBFLG2_DFS;
3004 }
3005 if (ses->capabilities & CAP_UNICODE) {
3006 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3007 length =
3008 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3009 6 /* max utf8 char length in bytes */ *
3010 (/* server len*/ + 256 /* share len */), nls_codepage);
3011 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3012 bcc_ptr += 2; /* skip trailing null */
3013 } else { /* ASCII */
3014 strcpy(bcc_ptr, tree);
3015 bcc_ptr += strlen(tree) + 1;
3016 }
3017 strcpy(bcc_ptr, "?????");
3018 bcc_ptr += strlen("?????");
3019 bcc_ptr += 1;
3020 count = bcc_ptr - &pSMB->Password[0];
3021 pSMB->hdr.smb_buf_length += count;
3022 pSMB->ByteCount = cpu_to_le16(count);
3023
3024 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3025 CIFS_STD_OP);
3026
3027 /* above now done in SendReceive */
3028 if ((rc == 0) && (tcon != NULL)) {
3029 bool is_unicode;
3030
3031 tcon->tidStatus = CifsGood;
3032 tcon->need_reconnect = false;
3033 tcon->tid = smb_buffer_response->Tid;
3034 bcc_ptr = pByteArea(smb_buffer_response);
3035 bytes_left = BCC(smb_buffer_response);
3036 length = strnlen(bcc_ptr, bytes_left - 2);
3037 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3038 is_unicode = true;
3039 else
3040 is_unicode = false;
3041
3042
3043 /* skip service field (NB: this field is always ASCII) */
3044 if (length == 3) {
3045 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3046 (bcc_ptr[2] == 'C')) {
3047 cFYI(1, "IPC connection");
3048 tcon->ipc = 1;
3049 }
3050 } else if (length == 2) {
3051 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3052 /* the most common case */
3053 cFYI(1, "disk share connection");
3054 }
3055 }
3056 bcc_ptr += length + 1;
3057 bytes_left -= (length + 1);
3058 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3059
3060 /* mostly informational -- no need to fail on error here */
3061 kfree(tcon->nativeFileSystem);
3062 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3063 bytes_left, is_unicode,
3064 nls_codepage);
3065
3066 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3067
3068 if ((smb_buffer_response->WordCount == 3) ||
3069 (smb_buffer_response->WordCount == 7))
3070 /* field is in same location */
3071 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3072 else
3073 tcon->Flags = 0;
3074 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3075 } else if ((rc == 0) && tcon == NULL) {
3076 /* all we need to save for IPC$ connection */
3077 ses->ipc_tid = smb_buffer_response->Tid;
3078 }
3079
3080 cifs_buf_release(smb_buffer);
3081 return rc;
3082 }
3083
3084 int
3085 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3086 {
3087 struct rb_root *root = &cifs_sb->tlink_tree;
3088 struct rb_node *node;
3089 struct tcon_link *tlink;
3090 char *tmp;
3091
3092 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3093
3094 spin_lock(&cifs_sb->tlink_tree_lock);
3095 while ((node = rb_first(root))) {
3096 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3097 cifs_get_tlink(tlink);
3098 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3099 rb_erase(node, root);
3100
3101 spin_unlock(&cifs_sb->tlink_tree_lock);
3102 cifs_put_tlink(tlink);
3103 spin_lock(&cifs_sb->tlink_tree_lock);
3104 }
3105 spin_unlock(&cifs_sb->tlink_tree_lock);
3106
3107 tmp = cifs_sb->prepath;
3108 cifs_sb->prepathlen = 0;
3109 cifs_sb->prepath = NULL;
3110 kfree(tmp);
3111
3112 return 0;
3113 }
3114
3115 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3116 {
3117 int rc = 0;
3118 struct TCP_Server_Info *server = ses->server;
3119
3120 /* only send once per connect */
3121 if (server->maxBuf != 0)
3122 return 0;
3123
3124 rc = CIFSSMBNegotiate(xid, ses);
3125 if (rc == -EAGAIN) {
3126 /* retry only once on 1st time connection */
3127 rc = CIFSSMBNegotiate(xid, ses);
3128 if (rc == -EAGAIN)
3129 rc = -EHOSTDOWN;
3130 }
3131 if (rc == 0) {
3132 spin_lock(&GlobalMid_Lock);
3133 if (server->tcpStatus != CifsExiting)
3134 server->tcpStatus = CifsGood;
3135 else
3136 rc = -EHOSTDOWN;
3137 spin_unlock(&GlobalMid_Lock);
3138
3139 }
3140
3141 return rc;
3142 }
3143
3144
3145 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3146 struct nls_table *nls_info)
3147 {
3148 int rc = 0;
3149 struct TCP_Server_Info *server = ses->server;
3150
3151 ses->flags = 0;
3152 ses->capabilities = server->capabilities;
3153 if (linuxExtEnabled == 0)
3154 ses->capabilities &= (~CAP_UNIX);
3155
3156 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3157 server->secMode, server->capabilities, server->timeAdj);
3158
3159 rc = CIFS_SessSetup(xid, ses, nls_info);
3160 if (rc) {
3161 cERROR(1, "Send error in SessSetup = %d", rc);
3162 } else {
3163 mutex_lock(&ses->server->srv_mutex);
3164 if (!server->session_estab) {
3165 server->session_key.response = ses->auth_key.response;
3166 server->session_key.len = ses->auth_key.len;
3167 server->sequence_number = 0x2;
3168 server->session_estab = true;
3169 ses->auth_key.response = NULL;
3170 }
3171 mutex_unlock(&server->srv_mutex);
3172
3173 cFYI(1, "CIFS Session Established successfully");
3174 spin_lock(&GlobalMid_Lock);
3175 ses->status = CifsGood;
3176 ses->need_reconnect = false;
3177 spin_unlock(&GlobalMid_Lock);
3178 }
3179
3180 kfree(ses->auth_key.response);
3181 ses->auth_key.response = NULL;
3182 ses->auth_key.len = 0;
3183 kfree(ses->ntlmssp);
3184 ses->ntlmssp = NULL;
3185
3186 return rc;
3187 }
3188
3189 static struct cifsTconInfo *
3190 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3191 {
3192 struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3193 struct cifsSesInfo *ses;
3194 struct cifsTconInfo *tcon = NULL;
3195 struct smb_vol *vol_info;
3196 char username[MAX_USERNAME_SIZE + 1];
3197
3198 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3199 if (vol_info == NULL) {
3200 tcon = ERR_PTR(-ENOMEM);
3201 goto out;
3202 }
3203
3204 snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3205 vol_info->username = username;
3206 vol_info->local_nls = cifs_sb->local_nls;
3207 vol_info->linux_uid = fsuid;
3208 vol_info->cred_uid = fsuid;
3209 vol_info->UNC = master_tcon->treeName;
3210 vol_info->retry = master_tcon->retry;
3211 vol_info->nocase = master_tcon->nocase;
3212 vol_info->local_lease = master_tcon->local_lease;
3213 vol_info->no_linux_ext = !master_tcon->unix_ext;
3214
3215 /* FIXME: allow for other secFlg settings */
3216 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3217
3218 /* get a reference for the same TCP session */
3219 spin_lock(&cifs_tcp_ses_lock);
3220 ++master_tcon->ses->server->srv_count;
3221 spin_unlock(&cifs_tcp_ses_lock);
3222
3223 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3224 if (IS_ERR(ses)) {
3225 tcon = (struct cifsTconInfo *)ses;
3226 cifs_put_tcp_session(master_tcon->ses->server);
3227 goto out;
3228 }
3229
3230 tcon = cifs_get_tcon(ses, vol_info);
3231 if (IS_ERR(tcon)) {
3232 cifs_put_smb_ses(ses);
3233 goto out;
3234 }
3235
3236 if (ses->capabilities & CAP_UNIX)
3237 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3238 out:
3239 kfree(vol_info);
3240
3241 return tcon;
3242 }
3243
3244 static inline struct tcon_link *
3245 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3246 {
3247 return cifs_sb->master_tlink;
3248 }
3249
3250 struct cifsTconInfo *
3251 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3252 {
3253 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3254 }
3255
3256 static int
3257 cifs_sb_tcon_pending_wait(void *unused)
3258 {
3259 schedule();
3260 return signal_pending(current) ? -ERESTARTSYS : 0;
3261 }
3262
3263 /* find and return a tlink with given uid */
3264 static struct tcon_link *
3265 tlink_rb_search(struct rb_root *root, uid_t uid)
3266 {
3267 struct rb_node *node = root->rb_node;
3268 struct tcon_link *tlink;
3269
3270 while (node) {
3271 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3272
3273 if (tlink->tl_uid > uid)
3274 node = node->rb_left;
3275 else if (tlink->tl_uid < uid)
3276 node = node->rb_right;
3277 else
3278 return tlink;
3279 }
3280 return NULL;
3281 }
3282
3283 /* insert a tcon_link into the tree */
3284 static void
3285 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3286 {
3287 struct rb_node **new = &(root->rb_node), *parent = NULL;
3288 struct tcon_link *tlink;
3289
3290 while (*new) {
3291 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3292 parent = *new;
3293
3294 if (tlink->tl_uid > new_tlink->tl_uid)
3295 new = &((*new)->rb_left);
3296 else
3297 new = &((*new)->rb_right);
3298 }
3299
3300 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3301 rb_insert_color(&new_tlink->tl_rbnode, root);
3302 }
3303
3304 /*
3305 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3306 * current task.
3307 *
3308 * If the superblock doesn't refer to a multiuser mount, then just return
3309 * the master tcon for the mount.
3310 *
3311 * First, search the rbtree for an existing tcon for this fsuid. If one
3312 * exists, then check to see if it's pending construction. If it is then wait
3313 * for construction to complete. Once it's no longer pending, check to see if
3314 * it failed and either return an error or retry construction, depending on
3315 * the timeout.
3316 *
3317 * If one doesn't exist then insert a new tcon_link struct into the tree and
3318 * try to construct a new one.
3319 */
3320 struct tcon_link *
3321 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3322 {
3323 int ret;
3324 uid_t fsuid = current_fsuid();
3325 struct tcon_link *tlink, *newtlink;
3326
3327 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3328 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3329
3330 spin_lock(&cifs_sb->tlink_tree_lock);
3331 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3332 if (tlink)
3333 cifs_get_tlink(tlink);
3334 spin_unlock(&cifs_sb->tlink_tree_lock);
3335
3336 if (tlink == NULL) {
3337 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3338 if (newtlink == NULL)
3339 return ERR_PTR(-ENOMEM);
3340 newtlink->tl_uid = fsuid;
3341 newtlink->tl_tcon = ERR_PTR(-EACCES);
3342 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3343 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3344 cifs_get_tlink(newtlink);
3345
3346 spin_lock(&cifs_sb->tlink_tree_lock);
3347 /* was one inserted after previous search? */
3348 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3349 if (tlink) {
3350 cifs_get_tlink(tlink);
3351 spin_unlock(&cifs_sb->tlink_tree_lock);
3352 kfree(newtlink);
3353 goto wait_for_construction;
3354 }
3355 tlink = newtlink;
3356 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3357 spin_unlock(&cifs_sb->tlink_tree_lock);
3358 } else {
3359 wait_for_construction:
3360 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3361 cifs_sb_tcon_pending_wait,
3362 TASK_INTERRUPTIBLE);
3363 if (ret) {
3364 cifs_put_tlink(tlink);
3365 return ERR_PTR(ret);
3366 }
3367
3368 /* if it's good, return it */
3369 if (!IS_ERR(tlink->tl_tcon))
3370 return tlink;
3371
3372 /* return error if we tried this already recently */
3373 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3374 cifs_put_tlink(tlink);
3375 return ERR_PTR(-EACCES);
3376 }
3377
3378 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3379 goto wait_for_construction;
3380 }
3381
3382 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3383 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3384 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3385
3386 if (IS_ERR(tlink->tl_tcon)) {
3387 cifs_put_tlink(tlink);
3388 return ERR_PTR(-EACCES);
3389 }
3390
3391 return tlink;
3392 }
3393
3394 /*
3395 * periodic workqueue job that scans tcon_tree for a superblock and closes
3396 * out tcons.
3397 */
3398 static void
3399 cifs_prune_tlinks(struct work_struct *work)
3400 {
3401 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3402 prune_tlinks.work);
3403 struct rb_root *root = &cifs_sb->tlink_tree;
3404 struct rb_node *node = rb_first(root);
3405 struct rb_node *tmp;
3406 struct tcon_link *tlink;
3407
3408 /*
3409 * Because we drop the spinlock in the loop in order to put the tlink
3410 * it's not guarded against removal of links from the tree. The only
3411 * places that remove entries from the tree are this function and
3412 * umounts. Because this function is non-reentrant and is canceled
3413 * before umount can proceed, this is safe.
3414 */
3415 spin_lock(&cifs_sb->tlink_tree_lock);
3416 node = rb_first(root);
3417 while (node != NULL) {
3418 tmp = node;
3419 node = rb_next(tmp);
3420 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3421
3422 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3423 atomic_read(&tlink->tl_count) != 0 ||
3424 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3425 continue;
3426
3427 cifs_get_tlink(tlink);
3428 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3429 rb_erase(tmp, root);
3430
3431 spin_unlock(&cifs_sb->tlink_tree_lock);
3432 cifs_put_tlink(tlink);
3433 spin_lock(&cifs_sb->tlink_tree_lock);
3434 }
3435 spin_unlock(&cifs_sb->tlink_tree_lock);
3436
3437 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3438 TLINK_IDLE_EXPIRE);
3439 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree