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[SCSI] libfcoe: Move common code from fcoe to libfcoe module
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob18d3c7724d6e0dce8f63336e2f64424fdf913961
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 remaining;
236 __u16 total_data_size, data_in_this_rsp;
237
238 if (pSMB->Command != SMB_COM_TRANSACTION2)
239 return 0;
240
241 /* check for plausible wct, bcc and t2 data and parm sizes */
242 /* check for parm and data offset going beyond end of smb */
243 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
244 cFYI(1, "invalid transact2 word count");
245 return -EINVAL;
246 }
247
248 pSMBt = (struct smb_t2_rsp *)pSMB;
249
250 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
251 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
252
253 remaining = total_data_size - data_in_this_rsp;
254
255 if (remaining == 0)
256 return 0;
257 else if (remaining < 0) {
258 cFYI(1, "total data %d smaller than data in frame %d",
259 total_data_size, data_in_this_rsp);
260 return -EINVAL;
261 } else {
262 cFYI(1, "missing %d bytes from transact2, check next response",
263 remaining);
264 if (total_data_size > maxBufSize) {
265 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
266 total_data_size, maxBufSize);
267 return -EINVAL;
268 }
269 return remaining;
270 }
271 }
272
273 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
274 {
275 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
276 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
277 char *data_area_of_target;
278 char *data_area_of_buf2;
279 int remaining;
280 __u16 byte_count, total_data_size, total_in_buf, total_in_buf2;
281
282 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
283
284 if (total_data_size !=
285 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
286 cFYI(1, "total data size of primary and secondary t2 differ");
287
288 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
289
290 remaining = total_data_size - total_in_buf;
291
292 if (remaining < 0)
293 return -EINVAL;
294
295 if (remaining == 0) /* nothing to do, ignore */
296 return 0;
297
298 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
299 if (remaining < total_in_buf2) {
300 cFYI(1, "transact2 2nd response contains too much data");
301 }
302
303 /* find end of first SMB data area */
304 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
305 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
306 /* validate target area */
307
308 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
309 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
310
311 data_area_of_target += total_in_buf;
312
313 /* copy second buffer into end of first buffer */
314 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
315 total_in_buf += total_in_buf2;
316 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
317 byte_count = get_bcc_le(pTargetSMB);
318 byte_count += total_in_buf2;
319 put_bcc_le(byte_count, pTargetSMB);
320
321 byte_count = pTargetSMB->smb_buf_length;
322 byte_count += total_in_buf2;
323
324 /* BB also add check that we are not beyond maximum buffer size */
325
326 pTargetSMB->smb_buf_length = byte_count;
327
328 if (remaining == total_in_buf2) {
329 cFYI(1, "found the last secondary response");
330 return 0; /* we are done */
331 } else /* more responses to go */
332 return 1;
333 }
334
335 static void
336 cifs_echo_request(struct work_struct *work)
337 {
338 int rc;
339 struct TCP_Server_Info *server = container_of(work,
340 struct TCP_Server_Info, echo.work);
341
342 /* no need to ping if we got a response recently */
343 if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
344 goto requeue_echo;
345
346 rc = CIFSSMBEcho(server);
347 if (rc)
348 cFYI(1, "Unable to send echo request to server: %s",
349 server->hostname);
350
351 requeue_echo:
352 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
353 }
354
355 static int
356 cifs_demultiplex_thread(struct TCP_Server_Info *server)
357 {
358 int length;
359 unsigned int pdu_length, total_read;
360 struct smb_hdr *smb_buffer = NULL;
361 struct smb_hdr *bigbuf = NULL;
362 struct smb_hdr *smallbuf = NULL;
363 struct msghdr smb_msg;
364 struct kvec iov;
365 struct socket *csocket = server->ssocket;
366 struct list_head *tmp, *tmp2;
367 struct task_struct *task_to_wake = NULL;
368 struct mid_q_entry *mid_entry;
369 char temp;
370 bool isLargeBuf = false;
371 bool isMultiRsp;
372 int reconnect;
373
374 current->flags |= PF_MEMALLOC;
375 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
376
377 length = atomic_inc_return(&tcpSesAllocCount);
378 if (length > 1)
379 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
380 GFP_KERNEL);
381
382 set_freezable();
383 while (server->tcpStatus != CifsExiting) {
384 if (try_to_freeze())
385 continue;
386 if (bigbuf == NULL) {
387 bigbuf = cifs_buf_get();
388 if (!bigbuf) {
389 cERROR(1, "No memory for large SMB response");
390 msleep(3000);
391 /* retry will check if exiting */
392 continue;
393 }
394 } else if (isLargeBuf) {
395 /* we are reusing a dirty large buf, clear its start */
396 memset(bigbuf, 0, sizeof(struct smb_hdr));
397 }
398
399 if (smallbuf == NULL) {
400 smallbuf = cifs_small_buf_get();
401 if (!smallbuf) {
402 cERROR(1, "No memory for SMB response");
403 msleep(1000);
404 /* retry will check if exiting */
405 continue;
406 }
407 /* beginning of smb buffer is cleared in our buf_get */
408 } else /* if existing small buf clear beginning */
409 memset(smallbuf, 0, sizeof(struct smb_hdr));
410
411 isLargeBuf = false;
412 isMultiRsp = false;
413 smb_buffer = smallbuf;
414 iov.iov_base = smb_buffer;
415 iov.iov_len = 4;
416 smb_msg.msg_control = NULL;
417 smb_msg.msg_controllen = 0;
418 pdu_length = 4; /* enough to get RFC1001 header */
419
420 incomplete_rcv:
421 if (echo_retries > 0 &&
422 time_after(jiffies, server->lstrp +
423 (echo_retries * SMB_ECHO_INTERVAL))) {
424 cERROR(1, "Server %s has not responded in %d seconds. "
425 "Reconnecting...", server->hostname,
426 (echo_retries * SMB_ECHO_INTERVAL / HZ));
427 cifs_reconnect(server);
428 csocket = server->ssocket;
429 wake_up(&server->response_q);
430 continue;
431 }
432
433 length =
434 kernel_recvmsg(csocket, &smb_msg,
435 &iov, 1, pdu_length, 0 /* BB other flags? */);
436
437 if (server->tcpStatus == CifsExiting) {
438 break;
439 } else if (server->tcpStatus == CifsNeedReconnect) {
440 cFYI(1, "Reconnect after server stopped responding");
441 cifs_reconnect(server);
442 cFYI(1, "call to reconnect done");
443 csocket = server->ssocket;
444 continue;
445 } else if (length == -ERESTARTSYS ||
446 length == -EAGAIN ||
447 length == -EINTR) {
448 msleep(1); /* minimum sleep to prevent looping
449 allowing socket to clear and app threads to set
450 tcpStatus CifsNeedReconnect if server hung */
451 if (pdu_length < 4) {
452 iov.iov_base = (4 - pdu_length) +
453 (char *)smb_buffer;
454 iov.iov_len = pdu_length;
455 smb_msg.msg_control = NULL;
456 smb_msg.msg_controllen = 0;
457 goto incomplete_rcv;
458 } else
459 continue;
460 } else if (length <= 0) {
461 cFYI(1, "Reconnect after unexpected peek error %d",
462 length);
463 cifs_reconnect(server);
464 csocket = server->ssocket;
465 wake_up(&server->response_q);
466 continue;
467 } else if (length < pdu_length) {
468 cFYI(1, "requested %d bytes but only got %d bytes",
469 pdu_length, length);
470 pdu_length -= length;
471 msleep(1);
472 goto incomplete_rcv;
473 }
474
475 /* The right amount was read from socket - 4 bytes */
476 /* so we can now interpret the length field */
477
478 /* the first byte big endian of the length field,
479 is actually not part of the length but the type
480 with the most common, zero, as regular data */
481 temp = *((char *) smb_buffer);
482
483 /* Note that FC 1001 length is big endian on the wire,
484 but we convert it here so it is always manipulated
485 as host byte order */
486 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
487 smb_buffer->smb_buf_length = pdu_length;
488
489 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
490
491 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
492 continue;
493 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
494 cFYI(1, "Good RFC 1002 session rsp");
495 continue;
496 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
497 /* we get this from Windows 98 instead of
498 an error on SMB negprot response */
499 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
500 pdu_length);
501 /* give server a second to clean up */
502 msleep(1000);
503 /* always try 445 first on reconnect since we get NACK
504 * on some if we ever connected to port 139 (the NACK
505 * is since we do not begin with RFC1001 session
506 * initialize frame)
507 */
508 cifs_set_port((struct sockaddr *)
509 &server->dstaddr, CIFS_PORT);
510 cifs_reconnect(server);
511 csocket = server->ssocket;
512 wake_up(&server->response_q);
513 continue;
514 } else if (temp != (char) 0) {
515 cERROR(1, "Unknown RFC 1002 frame");
516 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
517 length);
518 cifs_reconnect(server);
519 csocket = server->ssocket;
520 continue;
521 }
522
523 /* else we have an SMB response */
524 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
525 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
526 cERROR(1, "Invalid size SMB length %d pdu_length %d",
527 length, pdu_length+4);
528 cifs_reconnect(server);
529 csocket = server->ssocket;
530 wake_up(&server->response_q);
531 continue;
532 }
533
534 /* else length ok */
535 reconnect = 0;
536
537 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
538 isLargeBuf = true;
539 memcpy(bigbuf, smallbuf, 4);
540 smb_buffer = bigbuf;
541 }
542 length = 0;
543 iov.iov_base = 4 + (char *)smb_buffer;
544 iov.iov_len = pdu_length;
545 for (total_read = 0; total_read < pdu_length;
546 total_read += length) {
547 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
548 pdu_length - total_read, 0);
549 if (server->tcpStatus == CifsExiting) {
550 /* then will exit */
551 reconnect = 2;
552 break;
553 } else if (server->tcpStatus == CifsNeedReconnect) {
554 cifs_reconnect(server);
555 csocket = server->ssocket;
556 /* Reconnect wakes up rspns q */
557 /* Now we will reread sock */
558 reconnect = 1;
559 break;
560 } else if (length == -ERESTARTSYS ||
561 length == -EAGAIN ||
562 length == -EINTR) {
563 msleep(1); /* minimum sleep to prevent looping,
564 allowing socket to clear and app
565 threads to set tcpStatus
566 CifsNeedReconnect if server hung*/
567 length = 0;
568 continue;
569 } else if (length <= 0) {
570 cERROR(1, "Received no data, expecting %d",
571 pdu_length - total_read);
572 cifs_reconnect(server);
573 csocket = server->ssocket;
574 reconnect = 1;
575 break;
576 }
577 }
578 if (reconnect == 2)
579 break;
580 else if (reconnect == 1)
581 continue;
582
583 length += 4; /* account for rfc1002 hdr */
584
585
586 dump_smb(smb_buffer, length);
587 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
588 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
589 continue;
590 }
591
592 mid_entry = NULL;
593 server->lstrp = jiffies;
594
595 spin_lock(&GlobalMid_Lock);
596 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
597 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
598
599 if ((mid_entry->mid == smb_buffer->Mid) &&
600 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
601 (mid_entry->command == smb_buffer->Command)) {
602 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
603 /* We have a multipart transact2 resp */
604 isMultiRsp = true;
605 if (mid_entry->resp_buf) {
606 /* merge response - fix up 1st*/
607 if (coalesce_t2(smb_buffer,
608 mid_entry->resp_buf)) {
609 mid_entry->multiRsp =
610 true;
611 break;
612 } else {
613 /* all parts received */
614 mid_entry->multiEnd =
615 true;
616 goto multi_t2_fnd;
617 }
618 } else {
619 if (!isLargeBuf) {
620 cERROR(1, "1st trans2 resp needs bigbuf");
621 /* BB maybe we can fix this up, switch
622 to already allocated large buffer? */
623 } else {
624 /* Have first buffer */
625 mid_entry->resp_buf =
626 smb_buffer;
627 mid_entry->largeBuf =
628 true;
629 bigbuf = NULL;
630 }
631 }
632 break;
633 }
634 mid_entry->resp_buf = smb_buffer;
635 mid_entry->largeBuf = isLargeBuf;
636 multi_t2_fnd:
637 mid_entry->midState = MID_RESPONSE_RECEIVED;
638 list_del_init(&mid_entry->qhead);
639 mid_entry->callback(mid_entry);
640 #ifdef CONFIG_CIFS_STATS2
641 mid_entry->when_received = jiffies;
642 #endif
643 break;
644 }
645 mid_entry = NULL;
646 }
647 spin_unlock(&GlobalMid_Lock);
648
649 if (mid_entry != NULL) {
650 /* Was previous buf put in mpx struct for multi-rsp? */
651 if (!isMultiRsp) {
652 /* smb buffer will be freed by user thread */
653 if (isLargeBuf)
654 bigbuf = NULL;
655 else
656 smallbuf = NULL;
657 }
658 } else if (!is_valid_oplock_break(smb_buffer, server) &&
659 !isMultiRsp) {
660 cERROR(1, "No task to wake, unknown frame received! "
661 "NumMids %d", atomic_read(&midCount));
662 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
663 sizeof(struct smb_hdr));
664 #ifdef CONFIG_CIFS_DEBUG2
665 cifs_dump_detail(smb_buffer);
666 cifs_dump_mids(server);
667 #endif /* CIFS_DEBUG2 */
668
669 }
670 } /* end while !EXITING */
671
672 /* take it off the list, if it's not already */
673 spin_lock(&cifs_tcp_ses_lock);
674 list_del_init(&server->tcp_ses_list);
675 spin_unlock(&cifs_tcp_ses_lock);
676
677 spin_lock(&GlobalMid_Lock);
678 server->tcpStatus = CifsExiting;
679 spin_unlock(&GlobalMid_Lock);
680 wake_up_all(&server->response_q);
681
682 /* check if we have blocked requests that need to free */
683 /* Note that cifs_max_pending is normally 50, but
684 can be set at module install time to as little as two */
685 spin_lock(&GlobalMid_Lock);
686 if (atomic_read(&server->inFlight) >= cifs_max_pending)
687 atomic_set(&server->inFlight, cifs_max_pending - 1);
688 /* We do not want to set the max_pending too low or we
689 could end up with the counter going negative */
690 spin_unlock(&GlobalMid_Lock);
691 /* Although there should not be any requests blocked on
692 this queue it can not hurt to be paranoid and try to wake up requests
693 that may haven been blocked when more than 50 at time were on the wire
694 to the same server - they now will see the session is in exit state
695 and get out of SendReceive. */
696 wake_up_all(&server->request_q);
697 /* give those requests time to exit */
698 msleep(125);
699
700 if (server->ssocket) {
701 sock_release(csocket);
702 server->ssocket = NULL;
703 }
704 /* buffer usuallly freed in free_mid - need to free it here on exit */
705 cifs_buf_release(bigbuf);
706 if (smallbuf) /* no sense logging a debug message if NULL */
707 cifs_small_buf_release(smallbuf);
708
709 if (!list_empty(&server->pending_mid_q)) {
710 spin_lock(&GlobalMid_Lock);
711 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
712 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
713 cFYI(1, "Clearing Mid 0x%x - issuing callback",
714 mid_entry->mid);
715 list_del_init(&mid_entry->qhead);
716 mid_entry->callback(mid_entry);
717 }
718 spin_unlock(&GlobalMid_Lock);
719 /* 1/8th of sec is more than enough time for them to exit */
720 msleep(125);
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 /* mpx threads have not exited yet give them
725 at least the smb send timeout time for long ops */
726 /* due to delays on oplock break requests, we need
727 to wait at least 45 seconds before giving up
728 on a request getting a response and going ahead
729 and killing cifsd */
730 cFYI(1, "Wait for exit from demultiplex thread");
731 msleep(46000);
732 /* if threads still have not exited they are probably never
733 coming home not much else we can do but free the memory */
734 }
735
736 kfree(server->hostname);
737 task_to_wake = xchg(&server->tsk, NULL);
738 kfree(server);
739
740 length = atomic_dec_return(&tcpSesAllocCount);
741 if (length > 0)
742 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
743 GFP_KERNEL);
744
745 /* if server->tsk was NULL then wait for a signal before exiting */
746 if (!task_to_wake) {
747 set_current_state(TASK_INTERRUPTIBLE);
748 while (!signal_pending(current)) {
749 schedule();
750 set_current_state(TASK_INTERRUPTIBLE);
751 }
752 set_current_state(TASK_RUNNING);
753 }
754
755 module_put_and_exit(0);
756 }
757
758 /* extract the host portion of the UNC string */
759 static char *
760 extract_hostname(const char *unc)
761 {
762 const char *src;
763 char *dst, *delim;
764 unsigned int len;
765
766 /* skip double chars at beginning of string */
767 /* BB: check validity of these bytes? */
768 src = unc + 2;
769
770 /* delimiter between hostname and sharename is always '\\' now */
771 delim = strchr(src, '\\');
772 if (!delim)
773 return ERR_PTR(-EINVAL);
774
775 len = delim - src;
776 dst = kmalloc((len + 1), GFP_KERNEL);
777 if (dst == NULL)
778 return ERR_PTR(-ENOMEM);
779
780 memcpy(dst, src, len);
781 dst[len] = '\0';
782
783 return dst;
784 }
785
786 static int
787 cifs_parse_mount_options(char *options, const char *devname,
788 struct smb_vol *vol)
789 {
790 char *value;
791 char *data;
792 unsigned int temp_len, i, j;
793 char separator[2];
794 short int override_uid = -1;
795 short int override_gid = -1;
796 bool uid_specified = false;
797 bool gid_specified = false;
798 char *nodename = utsname()->nodename;
799
800 separator[0] = ',';
801 separator[1] = 0;
802
803 /*
804 * does not have to be perfect mapping since field is
805 * informational, only used for servers that do not support
806 * port 445 and it can be overridden at mount time
807 */
808 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
809 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
810 vol->source_rfc1001_name[i] = toupper(nodename[i]);
811
812 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
813 /* null target name indicates to use *SMBSERVR default called name
814 if we end up sending RFC1001 session initialize */
815 vol->target_rfc1001_name[0] = 0;
816 vol->cred_uid = current_uid();
817 vol->linux_uid = current_uid();
818 vol->linux_gid = current_gid();
819
820 /* default to only allowing write access to owner of the mount */
821 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
822
823 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
824 /* default is always to request posix paths. */
825 vol->posix_paths = 1;
826 /* default to using server inode numbers where available */
827 vol->server_ino = 1;
828
829 vol->actimeo = CIFS_DEF_ACTIMEO;
830
831 if (!options)
832 return 1;
833
834 if (strncmp(options, "sep=", 4) == 0) {
835 if (options[4] != 0) {
836 separator[0] = options[4];
837 options += 5;
838 } else {
839 cFYI(1, "Null separator not allowed");
840 }
841 }
842
843 while ((data = strsep(&options, separator)) != NULL) {
844 if (!*data)
845 continue;
846 if ((value = strchr(data, '=')) != NULL)
847 *value++ = '\0';
848
849 /* Have to parse this before we parse for "user" */
850 if (strnicmp(data, "user_xattr", 10) == 0) {
851 vol->no_xattr = 0;
852 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
853 vol->no_xattr = 1;
854 } else if (strnicmp(data, "user", 4) == 0) {
855 if (!value) {
856 printk(KERN_WARNING
857 "CIFS: invalid or missing username\n");
858 return 1; /* needs_arg; */
859 } else if (!*value) {
860 /* null user, ie anonymous, authentication */
861 vol->nullauth = 1;
862 }
863 if (strnlen(value, 200) < 200) {
864 vol->username = value;
865 } else {
866 printk(KERN_WARNING "CIFS: username too long\n");
867 return 1;
868 }
869 } else if (strnicmp(data, "pass", 4) == 0) {
870 if (!value) {
871 vol->password = NULL;
872 continue;
873 } else if (value[0] == 0) {
874 /* check if string begins with double comma
875 since that would mean the password really
876 does start with a comma, and would not
877 indicate an empty string */
878 if (value[1] != separator[0]) {
879 vol->password = NULL;
880 continue;
881 }
882 }
883 temp_len = strlen(value);
884 /* removed password length check, NTLM passwords
885 can be arbitrarily long */
886
887 /* if comma in password, the string will be
888 prematurely null terminated. Commas in password are
889 specified across the cifs mount interface by a double
890 comma ie ,, and a comma used as in other cases ie ','
891 as a parameter delimiter/separator is single and due
892 to the strsep above is temporarily zeroed. */
893
894 /* NB: password legally can have multiple commas and
895 the only illegal character in a password is null */
896
897 if ((value[temp_len] == 0) &&
898 (value[temp_len+1] == separator[0])) {
899 /* reinsert comma */
900 value[temp_len] = separator[0];
901 temp_len += 2; /* move after second comma */
902 while (value[temp_len] != 0) {
903 if (value[temp_len] == separator[0]) {
904 if (value[temp_len+1] ==
905 separator[0]) {
906 /* skip second comma */
907 temp_len++;
908 } else {
909 /* single comma indicating start
910 of next parm */
911 break;
912 }
913 }
914 temp_len++;
915 }
916 if (value[temp_len] == 0) {
917 options = NULL;
918 } else {
919 value[temp_len] = 0;
920 /* point option to start of next parm */
921 options = value + temp_len + 1;
922 }
923 /* go from value to value + temp_len condensing
924 double commas to singles. Note that this ends up
925 allocating a few bytes too many, which is ok */
926 vol->password = kzalloc(temp_len, GFP_KERNEL);
927 if (vol->password == NULL) {
928 printk(KERN_WARNING "CIFS: no memory "
929 "for password\n");
930 return 1;
931 }
932 for (i = 0, j = 0; i < temp_len; i++, j++) {
933 vol->password[j] = value[i];
934 if (value[i] == separator[0]
935 && value[i+1] == separator[0]) {
936 /* skip second comma */
937 i++;
938 }
939 }
940 vol->password[j] = 0;
941 } else {
942 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
943 if (vol->password == NULL) {
944 printk(KERN_WARNING "CIFS: no memory "
945 "for password\n");
946 return 1;
947 }
948 strcpy(vol->password, value);
949 }
950 } else if (!strnicmp(data, "ip", 2) ||
951 !strnicmp(data, "addr", 4)) {
952 if (!value || !*value) {
953 vol->UNCip = NULL;
954 } else if (strnlen(value, INET6_ADDRSTRLEN) <
955 INET6_ADDRSTRLEN) {
956 vol->UNCip = value;
957 } else {
958 printk(KERN_WARNING "CIFS: ip address "
959 "too long\n");
960 return 1;
961 }
962 } else if (strnicmp(data, "sec", 3) == 0) {
963 if (!value || !*value) {
964 cERROR(1, "no security value specified");
965 continue;
966 } else if (strnicmp(value, "krb5i", 5) == 0) {
967 vol->secFlg |= CIFSSEC_MAY_KRB5 |
968 CIFSSEC_MUST_SIGN;
969 } else if (strnicmp(value, "krb5p", 5) == 0) {
970 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
971 CIFSSEC_MAY_KRB5; */
972 cERROR(1, "Krb5 cifs privacy not supported");
973 return 1;
974 } else if (strnicmp(value, "krb5", 4) == 0) {
975 vol->secFlg |= CIFSSEC_MAY_KRB5;
976 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
977 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
978 CIFSSEC_MUST_SIGN;
979 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
980 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
981 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
982 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
983 CIFSSEC_MUST_SIGN;
984 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
985 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
986 } else if (strnicmp(value, "ntlmi", 5) == 0) {
987 vol->secFlg |= CIFSSEC_MAY_NTLM |
988 CIFSSEC_MUST_SIGN;
989 } else if (strnicmp(value, "ntlm", 4) == 0) {
990 /* ntlm is default so can be turned off too */
991 vol->secFlg |= CIFSSEC_MAY_NTLM;
992 } else if (strnicmp(value, "nontlm", 6) == 0) {
993 /* BB is there a better way to do this? */
994 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
995 #ifdef CONFIG_CIFS_WEAK_PW_HASH
996 } else if (strnicmp(value, "lanman", 6) == 0) {
997 vol->secFlg |= CIFSSEC_MAY_LANMAN;
998 #endif
999 } else if (strnicmp(value, "none", 4) == 0) {
1000 vol->nullauth = 1;
1001 } else {
1002 cERROR(1, "bad security option: %s", value);
1003 return 1;
1004 }
1005 } else if ((strnicmp(data, "unc", 3) == 0)
1006 || (strnicmp(data, "target", 6) == 0)
1007 || (strnicmp(data, "path", 4) == 0)) {
1008 if (!value || !*value) {
1009 printk(KERN_WARNING "CIFS: invalid path to "
1010 "network resource\n");
1011 return 1; /* needs_arg; */
1012 }
1013 if ((temp_len = strnlen(value, 300)) < 300) {
1014 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1015 if (vol->UNC == NULL)
1016 return 1;
1017 strcpy(vol->UNC, value);
1018 if (strncmp(vol->UNC, "//", 2) == 0) {
1019 vol->UNC[0] = '\\';
1020 vol->UNC[1] = '\\';
1021 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1022 printk(KERN_WARNING
1023 "CIFS: UNC Path does not begin "
1024 "with // or \\\\ \n");
1025 return 1;
1026 }
1027 } else {
1028 printk(KERN_WARNING "CIFS: UNC name too long\n");
1029 return 1;
1030 }
1031 } else if ((strnicmp(data, "domain", 3) == 0)
1032 || (strnicmp(data, "workgroup", 5) == 0)) {
1033 if (!value || !*value) {
1034 printk(KERN_WARNING "CIFS: invalid domain name\n");
1035 return 1; /* needs_arg; */
1036 }
1037 /* BB are there cases in which a comma can be valid in
1038 a domain name and need special handling? */
1039 if (strnlen(value, 256) < 256) {
1040 vol->domainname = value;
1041 cFYI(1, "Domain name set");
1042 } else {
1043 printk(KERN_WARNING "CIFS: domain name too "
1044 "long\n");
1045 return 1;
1046 }
1047 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1048 vol->srcaddr.ss_family = AF_UNSPEC;
1049
1050 if (!value || !*value) {
1051 printk(KERN_WARNING "CIFS: srcaddr value"
1052 " not specified.\n");
1053 return 1; /* needs_arg; */
1054 }
1055 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1056 value, strlen(value));
1057 if (i == 0) {
1058 printk(KERN_WARNING "CIFS: Could not parse"
1059 " srcaddr: %s\n",
1060 value);
1061 return 1;
1062 }
1063 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1064 if (!value || !*value) {
1065 printk(KERN_WARNING
1066 "CIFS: invalid path prefix\n");
1067 return 1; /* needs_argument */
1068 }
1069 if ((temp_len = strnlen(value, 1024)) < 1024) {
1070 if (value[0] != '/')
1071 temp_len++; /* missing leading slash */
1072 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1073 if (vol->prepath == NULL)
1074 return 1;
1075 if (value[0] != '/') {
1076 vol->prepath[0] = '/';
1077 strcpy(vol->prepath+1, value);
1078 } else
1079 strcpy(vol->prepath, value);
1080 cFYI(1, "prefix path %s", vol->prepath);
1081 } else {
1082 printk(KERN_WARNING "CIFS: prefix too long\n");
1083 return 1;
1084 }
1085 } else if (strnicmp(data, "iocharset", 9) == 0) {
1086 if (!value || !*value) {
1087 printk(KERN_WARNING "CIFS: invalid iocharset "
1088 "specified\n");
1089 return 1; /* needs_arg; */
1090 }
1091 if (strnlen(value, 65) < 65) {
1092 if (strnicmp(value, "default", 7))
1093 vol->iocharset = value;
1094 /* if iocharset not set then load_nls_default
1095 is used by caller */
1096 cFYI(1, "iocharset set to %s", value);
1097 } else {
1098 printk(KERN_WARNING "CIFS: iocharset name "
1099 "too long.\n");
1100 return 1;
1101 }
1102 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1103 vol->linux_uid = simple_strtoul(value, &value, 0);
1104 uid_specified = true;
1105 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1106 vol->cred_uid = simple_strtoul(value, &value, 0);
1107 } else if (!strnicmp(data, "forceuid", 8)) {
1108 override_uid = 1;
1109 } else if (!strnicmp(data, "noforceuid", 10)) {
1110 override_uid = 0;
1111 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1112 vol->linux_gid = simple_strtoul(value, &value, 0);
1113 gid_specified = true;
1114 } else if (!strnicmp(data, "forcegid", 8)) {
1115 override_gid = 1;
1116 } else if (!strnicmp(data, "noforcegid", 10)) {
1117 override_gid = 0;
1118 } else if (strnicmp(data, "file_mode", 4) == 0) {
1119 if (value && *value) {
1120 vol->file_mode =
1121 simple_strtoul(value, &value, 0);
1122 }
1123 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1124 if (value && *value) {
1125 vol->dir_mode =
1126 simple_strtoul(value, &value, 0);
1127 }
1128 } else if (strnicmp(data, "dirmode", 4) == 0) {
1129 if (value && *value) {
1130 vol->dir_mode =
1131 simple_strtoul(value, &value, 0);
1132 }
1133 } else if (strnicmp(data, "port", 4) == 0) {
1134 if (value && *value) {
1135 vol->port =
1136 simple_strtoul(value, &value, 0);
1137 }
1138 } else if (strnicmp(data, "rsize", 5) == 0) {
1139 if (value && *value) {
1140 vol->rsize =
1141 simple_strtoul(value, &value, 0);
1142 }
1143 } else if (strnicmp(data, "wsize", 5) == 0) {
1144 if (value && *value) {
1145 vol->wsize =
1146 simple_strtoul(value, &value, 0);
1147 }
1148 } else if (strnicmp(data, "sockopt", 5) == 0) {
1149 if (!value || !*value) {
1150 cERROR(1, "no socket option specified");
1151 continue;
1152 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1153 vol->sockopt_tcp_nodelay = 1;
1154 }
1155 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1156 if (!value || !*value || (*value == ' ')) {
1157 cFYI(1, "invalid (empty) netbiosname");
1158 } else {
1159 memset(vol->source_rfc1001_name, 0x20,
1160 RFC1001_NAME_LEN);
1161 /*
1162 * FIXME: are there cases in which a comma can
1163 * be valid in workstation netbios name (and
1164 * need special handling)?
1165 */
1166 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1167 /* don't ucase netbiosname for user */
1168 if (value[i] == 0)
1169 break;
1170 vol->source_rfc1001_name[i] = value[i];
1171 }
1172 /* The string has 16th byte zero still from
1173 set at top of the function */
1174 if (i == RFC1001_NAME_LEN && value[i] != 0)
1175 printk(KERN_WARNING "CIFS: netbiosname"
1176 " longer than 15 truncated.\n");
1177 }
1178 } else if (strnicmp(data, "servern", 7) == 0) {
1179 /* servernetbiosname specified override *SMBSERVER */
1180 if (!value || !*value || (*value == ' ')) {
1181 cFYI(1, "empty server netbiosname specified");
1182 } else {
1183 /* last byte, type, is 0x20 for servr type */
1184 memset(vol->target_rfc1001_name, 0x20,
1185 RFC1001_NAME_LEN_WITH_NULL);
1186
1187 for (i = 0; i < 15; i++) {
1188 /* BB are there cases in which a comma can be
1189 valid in this workstation netbios name
1190 (and need special handling)? */
1191
1192 /* user or mount helper must uppercase
1193 the netbiosname */
1194 if (value[i] == 0)
1195 break;
1196 else
1197 vol->target_rfc1001_name[i] =
1198 value[i];
1199 }
1200 /* The string has 16th byte zero still from
1201 set at top of the function */
1202 if (i == RFC1001_NAME_LEN && value[i] != 0)
1203 printk(KERN_WARNING "CIFS: server net"
1204 "biosname longer than 15 truncated.\n");
1205 }
1206 } else if (strnicmp(data, "actimeo", 7) == 0) {
1207 if (value && *value) {
1208 vol->actimeo = HZ * simple_strtoul(value,
1209 &value, 0);
1210 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1211 cERROR(1, "CIFS: attribute cache"
1212 "timeout too large");
1213 return 1;
1214 }
1215 }
1216 } else if (strnicmp(data, "credentials", 4) == 0) {
1217 /* ignore */
1218 } else if (strnicmp(data, "version", 3) == 0) {
1219 /* ignore */
1220 } else if (strnicmp(data, "guest", 5) == 0) {
1221 /* ignore */
1222 } else if (strnicmp(data, "rw", 2) == 0) {
1223 /* ignore */
1224 } else if (strnicmp(data, "ro", 2) == 0) {
1225 /* ignore */
1226 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1227 vol->noblocksnd = 1;
1228 } else if (strnicmp(data, "noautotune", 10) == 0) {
1229 vol->noautotune = 1;
1230 } else if ((strnicmp(data, "suid", 4) == 0) ||
1231 (strnicmp(data, "nosuid", 6) == 0) ||
1232 (strnicmp(data, "exec", 4) == 0) ||
1233 (strnicmp(data, "noexec", 6) == 0) ||
1234 (strnicmp(data, "nodev", 5) == 0) ||
1235 (strnicmp(data, "noauto", 6) == 0) ||
1236 (strnicmp(data, "dev", 3) == 0)) {
1237 /* The mount tool or mount.cifs helper (if present)
1238 uses these opts to set flags, and the flags are read
1239 by the kernel vfs layer before we get here (ie
1240 before read super) so there is no point trying to
1241 parse these options again and set anything and it
1242 is ok to just ignore them */
1243 continue;
1244 } else if (strnicmp(data, "hard", 4) == 0) {
1245 vol->retry = 1;
1246 } else if (strnicmp(data, "soft", 4) == 0) {
1247 vol->retry = 0;
1248 } else if (strnicmp(data, "perm", 4) == 0) {
1249 vol->noperm = 0;
1250 } else if (strnicmp(data, "noperm", 6) == 0) {
1251 vol->noperm = 1;
1252 } else if (strnicmp(data, "mapchars", 8) == 0) {
1253 vol->remap = 1;
1254 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1255 vol->remap = 0;
1256 } else if (strnicmp(data, "sfu", 3) == 0) {
1257 vol->sfu_emul = 1;
1258 } else if (strnicmp(data, "nosfu", 5) == 0) {
1259 vol->sfu_emul = 0;
1260 } else if (strnicmp(data, "nodfs", 5) == 0) {
1261 vol->nodfs = 1;
1262 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1263 vol->posix_paths = 1;
1264 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1265 vol->posix_paths = 0;
1266 } else if (strnicmp(data, "nounix", 6) == 0) {
1267 vol->no_linux_ext = 1;
1268 } else if (strnicmp(data, "nolinux", 7) == 0) {
1269 vol->no_linux_ext = 1;
1270 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1271 (strnicmp(data, "ignorecase", 10) == 0)) {
1272 vol->nocase = 1;
1273 } else if (strnicmp(data, "mand", 4) == 0) {
1274 /* ignore */
1275 } else if (strnicmp(data, "nomand", 6) == 0) {
1276 /* ignore */
1277 } else if (strnicmp(data, "_netdev", 7) == 0) {
1278 /* ignore */
1279 } else if (strnicmp(data, "brl", 3) == 0) {
1280 vol->nobrl = 0;
1281 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1282 (strnicmp(data, "nolock", 6) == 0)) {
1283 vol->nobrl = 1;
1284 /* turn off mandatory locking in mode
1285 if remote locking is turned off since the
1286 local vfs will do advisory */
1287 if (vol->file_mode ==
1288 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1289 vol->file_mode = S_IALLUGO;
1290 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1291 /* will take the shorter form "forcemand" as well */
1292 /* This mount option will force use of mandatory
1293 (DOS/Windows style) byte range locks, instead of
1294 using posix advisory byte range locks, even if the
1295 Unix extensions are available and posix locks would
1296 be supported otherwise. If Unix extensions are not
1297 negotiated this has no effect since mandatory locks
1298 would be used (mandatory locks is all that those
1299 those servers support) */
1300 vol->mand_lock = 1;
1301 } else if (strnicmp(data, "setuids", 7) == 0) {
1302 vol->setuids = 1;
1303 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1304 vol->setuids = 0;
1305 } else if (strnicmp(data, "dynperm", 7) == 0) {
1306 vol->dynperm = true;
1307 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1308 vol->dynperm = false;
1309 } else if (strnicmp(data, "nohard", 6) == 0) {
1310 vol->retry = 0;
1311 } else if (strnicmp(data, "nosoft", 6) == 0) {
1312 vol->retry = 1;
1313 } else if (strnicmp(data, "nointr", 6) == 0) {
1314 vol->intr = 0;
1315 } else if (strnicmp(data, "intr", 4) == 0) {
1316 vol->intr = 1;
1317 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1318 vol->nostrictsync = 1;
1319 } else if (strnicmp(data, "strictsync", 10) == 0) {
1320 vol->nostrictsync = 0;
1321 } else if (strnicmp(data, "serverino", 7) == 0) {
1322 vol->server_ino = 1;
1323 } else if (strnicmp(data, "noserverino", 9) == 0) {
1324 vol->server_ino = 0;
1325 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1326 vol->cifs_acl = 1;
1327 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1328 vol->cifs_acl = 0;
1329 } else if (strnicmp(data, "acl", 3) == 0) {
1330 vol->no_psx_acl = 0;
1331 } else if (strnicmp(data, "noacl", 5) == 0) {
1332 vol->no_psx_acl = 1;
1333 } else if (strnicmp(data, "locallease", 6) == 0) {
1334 vol->local_lease = 1;
1335 } else if (strnicmp(data, "sign", 4) == 0) {
1336 vol->secFlg |= CIFSSEC_MUST_SIGN;
1337 } else if (strnicmp(data, "seal", 4) == 0) {
1338 /* we do not do the following in secFlags because seal
1339 is a per tree connection (mount) not a per socket
1340 or per-smb connection option in the protocol */
1341 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1342 vol->seal = 1;
1343 } else if (strnicmp(data, "direct", 6) == 0) {
1344 vol->direct_io = 1;
1345 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1346 vol->direct_io = 1;
1347 } else if (strnicmp(data, "noac", 4) == 0) {
1348 printk(KERN_WARNING "CIFS: Mount option noac not "
1349 "supported. Instead set "
1350 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1351 } else if (strnicmp(data, "fsc", 3) == 0) {
1352 #ifndef CONFIG_CIFS_FSCACHE
1353 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
1354 "kernel config option set");
1355 return 1;
1356 #endif
1357 vol->fsc = true;
1358 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1359 vol->mfsymlinks = true;
1360 } else if (strnicmp(data, "multiuser", 8) == 0) {
1361 vol->multiuser = true;
1362 } else
1363 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1364 data);
1365 }
1366 if (vol->UNC == NULL) {
1367 if (devname == NULL) {
1368 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1369 "target\n");
1370 return 1;
1371 }
1372 if ((temp_len = strnlen(devname, 300)) < 300) {
1373 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1374 if (vol->UNC == NULL)
1375 return 1;
1376 strcpy(vol->UNC, devname);
1377 if (strncmp(vol->UNC, "//", 2) == 0) {
1378 vol->UNC[0] = '\\';
1379 vol->UNC[1] = '\\';
1380 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1381 printk(KERN_WARNING "CIFS: UNC Path does not "
1382 "begin with // or \\\\ \n");
1383 return 1;
1384 }
1385 value = strpbrk(vol->UNC+2, "/\\");
1386 if (value)
1387 *value = '\\';
1388 } else {
1389 printk(KERN_WARNING "CIFS: UNC name too long\n");
1390 return 1;
1391 }
1392 }
1393
1394 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1395 cERROR(1, "Multiuser mounts currently require krb5 "
1396 "authentication!");
1397 return 1;
1398 }
1399
1400 if (vol->UNCip == NULL)
1401 vol->UNCip = &vol->UNC[2];
1402
1403 if (uid_specified)
1404 vol->override_uid = override_uid;
1405 else if (override_uid == 1)
1406 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1407 "specified with no uid= option.\n");
1408
1409 if (gid_specified)
1410 vol->override_gid = override_gid;
1411 else if (override_gid == 1)
1412 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1413 "specified with no gid= option.\n");
1414
1415 return 0;
1416 }
1417
1418 /** Returns true if srcaddr isn't specified and rhs isn't
1419 * specified, or if srcaddr is specified and
1420 * matches the IP address of the rhs argument.
1421 */
1422 static bool
1423 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1424 {
1425 switch (srcaddr->sa_family) {
1426 case AF_UNSPEC:
1427 return (rhs->sa_family == AF_UNSPEC);
1428 case AF_INET: {
1429 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1430 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1431 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1432 }
1433 case AF_INET6: {
1434 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1435 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1436 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1437 }
1438 default:
1439 WARN_ON(1);
1440 return false; /* don't expect to be here */
1441 }
1442 }
1443
1444 /*
1445 * If no port is specified in addr structure, we try to match with 445 port
1446 * and if it fails - with 139 ports. It should be called only if address
1447 * families of server and addr are equal.
1448 */
1449 static bool
1450 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1451 {
1452 unsigned short int port, *sport;
1453
1454 switch (addr->sa_family) {
1455 case AF_INET:
1456 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1457 port = ((struct sockaddr_in *) addr)->sin_port;
1458 break;
1459 case AF_INET6:
1460 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1461 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1462 break;
1463 default:
1464 WARN_ON(1);
1465 return false;
1466 }
1467
1468 if (!port) {
1469 port = htons(CIFS_PORT);
1470 if (port == *sport)
1471 return true;
1472
1473 port = htons(RFC1001_PORT);
1474 }
1475
1476 return port == *sport;
1477 }
1478
1479 static bool
1480 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1481 struct sockaddr *srcaddr)
1482 {
1483 switch (addr->sa_family) {
1484 case AF_INET: {
1485 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1486 struct sockaddr_in *srv_addr4 =
1487 (struct sockaddr_in *)&server->dstaddr;
1488
1489 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1490 return false;
1491 break;
1492 }
1493 case AF_INET6: {
1494 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1495 struct sockaddr_in6 *srv_addr6 =
1496 (struct sockaddr_in6 *)&server->dstaddr;
1497
1498 if (!ipv6_addr_equal(&addr6->sin6_addr,
1499 &srv_addr6->sin6_addr))
1500 return false;
1501 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1502 return false;
1503 break;
1504 }
1505 default:
1506 WARN_ON(1);
1507 return false; /* don't expect to be here */
1508 }
1509
1510 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1511 return false;
1512
1513 return true;
1514 }
1515
1516 static bool
1517 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1518 {
1519 unsigned int secFlags;
1520
1521 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1522 secFlags = vol->secFlg;
1523 else
1524 secFlags = global_secflags | vol->secFlg;
1525
1526 switch (server->secType) {
1527 case LANMAN:
1528 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1529 return false;
1530 break;
1531 case NTLMv2:
1532 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1533 return false;
1534 break;
1535 case NTLM:
1536 if (!(secFlags & CIFSSEC_MAY_NTLM))
1537 return false;
1538 break;
1539 case Kerberos:
1540 if (!(secFlags & CIFSSEC_MAY_KRB5))
1541 return false;
1542 break;
1543 case RawNTLMSSP:
1544 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1545 return false;
1546 break;
1547 default:
1548 /* shouldn't happen */
1549 return false;
1550 }
1551
1552 /* now check if signing mode is acceptible */
1553 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1554 (server->secMode & SECMODE_SIGN_REQUIRED))
1555 return false;
1556 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1557 (server->secMode &
1558 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1559 return false;
1560
1561 return true;
1562 }
1563
1564 static struct TCP_Server_Info *
1565 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1566 {
1567 struct TCP_Server_Info *server;
1568
1569 spin_lock(&cifs_tcp_ses_lock);
1570 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1571 if (!match_address(server, addr,
1572 (struct sockaddr *)&vol->srcaddr))
1573 continue;
1574
1575 if (!match_port(server, addr))
1576 continue;
1577
1578 if (!match_security(server, vol))
1579 continue;
1580
1581 ++server->srv_count;
1582 spin_unlock(&cifs_tcp_ses_lock);
1583 cFYI(1, "Existing tcp session with server found");
1584 return server;
1585 }
1586 spin_unlock(&cifs_tcp_ses_lock);
1587 return NULL;
1588 }
1589
1590 static void
1591 cifs_put_tcp_session(struct TCP_Server_Info *server)
1592 {
1593 struct task_struct *task;
1594
1595 spin_lock(&cifs_tcp_ses_lock);
1596 if (--server->srv_count > 0) {
1597 spin_unlock(&cifs_tcp_ses_lock);
1598 return;
1599 }
1600
1601 list_del_init(&server->tcp_ses_list);
1602 spin_unlock(&cifs_tcp_ses_lock);
1603
1604 cancel_delayed_work_sync(&server->echo);
1605
1606 spin_lock(&GlobalMid_Lock);
1607 server->tcpStatus = CifsExiting;
1608 spin_unlock(&GlobalMid_Lock);
1609
1610 cifs_crypto_shash_release(server);
1611 cifs_fscache_release_client_cookie(server);
1612
1613 kfree(server->session_key.response);
1614 server->session_key.response = NULL;
1615 server->session_key.len = 0;
1616
1617 task = xchg(&server->tsk, NULL);
1618 if (task)
1619 force_sig(SIGKILL, task);
1620 }
1621
1622 static struct TCP_Server_Info *
1623 cifs_get_tcp_session(struct smb_vol *volume_info)
1624 {
1625 struct TCP_Server_Info *tcp_ses = NULL;
1626 struct sockaddr_storage addr;
1627 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1628 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1629 int rc;
1630
1631 memset(&addr, 0, sizeof(struct sockaddr_storage));
1632
1633 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1634
1635 if (volume_info->UNCip && volume_info->UNC) {
1636 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1637 volume_info->UNCip,
1638 strlen(volume_info->UNCip),
1639 volume_info->port);
1640 if (!rc) {
1641 /* we failed translating address */
1642 rc = -EINVAL;
1643 goto out_err;
1644 }
1645 } else if (volume_info->UNCip) {
1646 /* BB using ip addr as tcp_ses name to connect to the
1647 DFS root below */
1648 cERROR(1, "Connecting to DFS root not implemented yet");
1649 rc = -EINVAL;
1650 goto out_err;
1651 } else /* which tcp_sess DFS root would we conect to */ {
1652 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1653 "unc=//192.168.1.100/public) specified");
1654 rc = -EINVAL;
1655 goto out_err;
1656 }
1657
1658 /* see if we already have a matching tcp_ses */
1659 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1660 if (tcp_ses)
1661 return tcp_ses;
1662
1663 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1664 if (!tcp_ses) {
1665 rc = -ENOMEM;
1666 goto out_err;
1667 }
1668
1669 rc = cifs_crypto_shash_allocate(tcp_ses);
1670 if (rc) {
1671 cERROR(1, "could not setup hash structures rc %d", rc);
1672 goto out_err;
1673 }
1674
1675 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1676 if (IS_ERR(tcp_ses->hostname)) {
1677 rc = PTR_ERR(tcp_ses->hostname);
1678 goto out_err_crypto_release;
1679 }
1680
1681 tcp_ses->noblocksnd = volume_info->noblocksnd;
1682 tcp_ses->noautotune = volume_info->noautotune;
1683 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1684 atomic_set(&tcp_ses->inFlight, 0);
1685 init_waitqueue_head(&tcp_ses->response_q);
1686 init_waitqueue_head(&tcp_ses->request_q);
1687 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1688 mutex_init(&tcp_ses->srv_mutex);
1689 memcpy(tcp_ses->workstation_RFC1001_name,
1690 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1691 memcpy(tcp_ses->server_RFC1001_name,
1692 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1693 tcp_ses->session_estab = false;
1694 tcp_ses->sequence_number = 0;
1695 tcp_ses->lstrp = jiffies;
1696 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1697 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1698 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1699
1700 /*
1701 * at this point we are the only ones with the pointer
1702 * to the struct since the kernel thread not created yet
1703 * no need to spinlock this init of tcpStatus or srv_count
1704 */
1705 tcp_ses->tcpStatus = CifsNew;
1706 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1707 sizeof(tcp_ses->srcaddr));
1708 ++tcp_ses->srv_count;
1709
1710 if (addr.ss_family == AF_INET6) {
1711 cFYI(1, "attempting ipv6 connect");
1712 /* BB should we allow ipv6 on port 139? */
1713 /* other OS never observed in Wild doing 139 with v6 */
1714 memcpy(&tcp_ses->dstaddr, sin_server6,
1715 sizeof(struct sockaddr_in6));
1716 } else
1717 memcpy(&tcp_ses->dstaddr, sin_server,
1718 sizeof(struct sockaddr_in));
1719
1720 rc = ip_connect(tcp_ses);
1721 if (rc < 0) {
1722 cERROR(1, "Error connecting to socket. Aborting operation");
1723 goto out_err_crypto_release;
1724 }
1725
1726 /*
1727 * since we're in a cifs function already, we know that
1728 * this will succeed. No need for try_module_get().
1729 */
1730 __module_get(THIS_MODULE);
1731 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1732 tcp_ses, "cifsd");
1733 if (IS_ERR(tcp_ses->tsk)) {
1734 rc = PTR_ERR(tcp_ses->tsk);
1735 cERROR(1, "error %d create cifsd thread", rc);
1736 module_put(THIS_MODULE);
1737 goto out_err_crypto_release;
1738 }
1739
1740 /* thread spawned, put it on the list */
1741 spin_lock(&cifs_tcp_ses_lock);
1742 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1743 spin_unlock(&cifs_tcp_ses_lock);
1744
1745 cifs_fscache_get_client_cookie(tcp_ses);
1746
1747 /* queue echo request delayed work */
1748 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1749
1750 return tcp_ses;
1751
1752 out_err_crypto_release:
1753 cifs_crypto_shash_release(tcp_ses);
1754
1755 out_err:
1756 if (tcp_ses) {
1757 if (!IS_ERR(tcp_ses->hostname))
1758 kfree(tcp_ses->hostname);
1759 if (tcp_ses->ssocket)
1760 sock_release(tcp_ses->ssocket);
1761 kfree(tcp_ses);
1762 }
1763 return ERR_PTR(rc);
1764 }
1765
1766 static struct cifsSesInfo *
1767 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1768 {
1769 struct cifsSesInfo *ses;
1770
1771 spin_lock(&cifs_tcp_ses_lock);
1772 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1773 switch (server->secType) {
1774 case Kerberos:
1775 if (vol->cred_uid != ses->cred_uid)
1776 continue;
1777 break;
1778 default:
1779 /* anything else takes username/password */
1780 if (strncmp(ses->userName, vol->username,
1781 MAX_USERNAME_SIZE))
1782 continue;
1783 if (strlen(vol->username) != 0 &&
1784 ses->password != NULL &&
1785 strncmp(ses->password,
1786 vol->password ? vol->password : "",
1787 MAX_PASSWORD_SIZE))
1788 continue;
1789 }
1790 ++ses->ses_count;
1791 spin_unlock(&cifs_tcp_ses_lock);
1792 return ses;
1793 }
1794 spin_unlock(&cifs_tcp_ses_lock);
1795 return NULL;
1796 }
1797
1798 static void
1799 cifs_put_smb_ses(struct cifsSesInfo *ses)
1800 {
1801 int xid;
1802 struct TCP_Server_Info *server = ses->server;
1803
1804 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1805 spin_lock(&cifs_tcp_ses_lock);
1806 if (--ses->ses_count > 0) {
1807 spin_unlock(&cifs_tcp_ses_lock);
1808 return;
1809 }
1810
1811 list_del_init(&ses->smb_ses_list);
1812 spin_unlock(&cifs_tcp_ses_lock);
1813
1814 if (ses->status == CifsGood) {
1815 xid = GetXid();
1816 CIFSSMBLogoff(xid, ses);
1817 _FreeXid(xid);
1818 }
1819 sesInfoFree(ses);
1820 cifs_put_tcp_session(server);
1821 }
1822
1823 static struct cifsSesInfo *
1824 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1825 {
1826 int rc = -ENOMEM, xid;
1827 struct cifsSesInfo *ses;
1828 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1829 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1830
1831 xid = GetXid();
1832
1833 ses = cifs_find_smb_ses(server, volume_info);
1834 if (ses) {
1835 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1836
1837 mutex_lock(&ses->session_mutex);
1838 rc = cifs_negotiate_protocol(xid, ses);
1839 if (rc) {
1840 mutex_unlock(&ses->session_mutex);
1841 /* problem -- put our ses reference */
1842 cifs_put_smb_ses(ses);
1843 FreeXid(xid);
1844 return ERR_PTR(rc);
1845 }
1846 if (ses->need_reconnect) {
1847 cFYI(1, "Session needs reconnect");
1848 rc = cifs_setup_session(xid, ses,
1849 volume_info->local_nls);
1850 if (rc) {
1851 mutex_unlock(&ses->session_mutex);
1852 /* problem -- put our reference */
1853 cifs_put_smb_ses(ses);
1854 FreeXid(xid);
1855 return ERR_PTR(rc);
1856 }
1857 }
1858 mutex_unlock(&ses->session_mutex);
1859
1860 /* existing SMB ses has a server reference already */
1861 cifs_put_tcp_session(server);
1862 FreeXid(xid);
1863 return ses;
1864 }
1865
1866 cFYI(1, "Existing smb sess not found");
1867 ses = sesInfoAlloc();
1868 if (ses == NULL)
1869 goto get_ses_fail;
1870
1871 /* new SMB session uses our server ref */
1872 ses->server = server;
1873 if (server->dstaddr.ss_family == AF_INET6)
1874 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1875 else
1876 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1877
1878 if (volume_info->username)
1879 strncpy(ses->userName, volume_info->username,
1880 MAX_USERNAME_SIZE);
1881
1882 /* volume_info->password freed at unmount */
1883 if (volume_info->password) {
1884 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1885 if (!ses->password)
1886 goto get_ses_fail;
1887 }
1888 if (volume_info->domainname) {
1889 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1890 if (!ses->domainName)
1891 goto get_ses_fail;
1892 }
1893 ses->cred_uid = volume_info->cred_uid;
1894 ses->linux_uid = volume_info->linux_uid;
1895 ses->overrideSecFlg = volume_info->secFlg;
1896
1897 mutex_lock(&ses->session_mutex);
1898 rc = cifs_negotiate_protocol(xid, ses);
1899 if (!rc)
1900 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1901 mutex_unlock(&ses->session_mutex);
1902 if (rc)
1903 goto get_ses_fail;
1904
1905 /* success, put it on the list */
1906 spin_lock(&cifs_tcp_ses_lock);
1907 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1908 spin_unlock(&cifs_tcp_ses_lock);
1909
1910 FreeXid(xid);
1911 return ses;
1912
1913 get_ses_fail:
1914 sesInfoFree(ses);
1915 FreeXid(xid);
1916 return ERR_PTR(rc);
1917 }
1918
1919 static struct cifsTconInfo *
1920 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1921 {
1922 struct list_head *tmp;
1923 struct cifsTconInfo *tcon;
1924
1925 spin_lock(&cifs_tcp_ses_lock);
1926 list_for_each(tmp, &ses->tcon_list) {
1927 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1928 if (tcon->tidStatus == CifsExiting)
1929 continue;
1930 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1931 continue;
1932
1933 ++tcon->tc_count;
1934 spin_unlock(&cifs_tcp_ses_lock);
1935 return tcon;
1936 }
1937 spin_unlock(&cifs_tcp_ses_lock);
1938 return NULL;
1939 }
1940
1941 static void
1942 cifs_put_tcon(struct cifsTconInfo *tcon)
1943 {
1944 int xid;
1945 struct cifsSesInfo *ses = tcon->ses;
1946
1947 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1948 spin_lock(&cifs_tcp_ses_lock);
1949 if (--tcon->tc_count > 0) {
1950 spin_unlock(&cifs_tcp_ses_lock);
1951 return;
1952 }
1953
1954 list_del_init(&tcon->tcon_list);
1955 spin_unlock(&cifs_tcp_ses_lock);
1956
1957 xid = GetXid();
1958 CIFSSMBTDis(xid, tcon);
1959 _FreeXid(xid);
1960
1961 cifs_fscache_release_super_cookie(tcon);
1962 tconInfoFree(tcon);
1963 cifs_put_smb_ses(ses);
1964 }
1965
1966 static struct cifsTconInfo *
1967 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1968 {
1969 int rc, xid;
1970 struct cifsTconInfo *tcon;
1971
1972 tcon = cifs_find_tcon(ses, volume_info->UNC);
1973 if (tcon) {
1974 cFYI(1, "Found match on UNC path");
1975 /* existing tcon already has a reference */
1976 cifs_put_smb_ses(ses);
1977 if (tcon->seal != volume_info->seal)
1978 cERROR(1, "transport encryption setting "
1979 "conflicts with existing tid");
1980 return tcon;
1981 }
1982
1983 tcon = tconInfoAlloc();
1984 if (tcon == NULL) {
1985 rc = -ENOMEM;
1986 goto out_fail;
1987 }
1988
1989 tcon->ses = ses;
1990 if (volume_info->password) {
1991 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1992 if (!tcon->password) {
1993 rc = -ENOMEM;
1994 goto out_fail;
1995 }
1996 }
1997
1998 if (strchr(volume_info->UNC + 3, '\\') == NULL
1999 && strchr(volume_info->UNC + 3, '/') == NULL) {
2000 cERROR(1, "Missing share name");
2001 rc = -ENODEV;
2002 goto out_fail;
2003 }
2004
2005 /* BB Do we need to wrap session_mutex around
2006 * this TCon call and Unix SetFS as
2007 * we do on SessSetup and reconnect? */
2008 xid = GetXid();
2009 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2010 FreeXid(xid);
2011 cFYI(1, "CIFS Tcon rc = %d", rc);
2012 if (rc)
2013 goto out_fail;
2014
2015 if (volume_info->nodfs) {
2016 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2017 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2018 }
2019 tcon->seal = volume_info->seal;
2020 /* we can have only one retry value for a connection
2021 to a share so for resources mounted more than once
2022 to the same server share the last value passed in
2023 for the retry flag is used */
2024 tcon->retry = volume_info->retry;
2025 tcon->nocase = volume_info->nocase;
2026 tcon->local_lease = volume_info->local_lease;
2027
2028 spin_lock(&cifs_tcp_ses_lock);
2029 list_add(&tcon->tcon_list, &ses->tcon_list);
2030 spin_unlock(&cifs_tcp_ses_lock);
2031
2032 cifs_fscache_get_super_cookie(tcon);
2033
2034 return tcon;
2035
2036 out_fail:
2037 tconInfoFree(tcon);
2038 return ERR_PTR(rc);
2039 }
2040
2041 void
2042 cifs_put_tlink(struct tcon_link *tlink)
2043 {
2044 if (!tlink || IS_ERR(tlink))
2045 return;
2046
2047 if (!atomic_dec_and_test(&tlink->tl_count) ||
2048 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2049 tlink->tl_time = jiffies;
2050 return;
2051 }
2052
2053 if (!IS_ERR(tlink_tcon(tlink)))
2054 cifs_put_tcon(tlink_tcon(tlink));
2055 kfree(tlink);
2056 return;
2057 }
2058
2059 int
2060 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2061 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2062 struct dfs_info3_param **preferrals, int remap)
2063 {
2064 char *temp_unc;
2065 int rc = 0;
2066
2067 *pnum_referrals = 0;
2068 *preferrals = NULL;
2069
2070 if (pSesInfo->ipc_tid == 0) {
2071 temp_unc = kmalloc(2 /* for slashes */ +
2072 strnlen(pSesInfo->serverName,
2073 SERVER_NAME_LEN_WITH_NULL * 2)
2074 + 1 + 4 /* slash IPC$ */ + 2,
2075 GFP_KERNEL);
2076 if (temp_unc == NULL)
2077 return -ENOMEM;
2078 temp_unc[0] = '\\';
2079 temp_unc[1] = '\\';
2080 strcpy(temp_unc + 2, pSesInfo->serverName);
2081 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2082 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2083 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2084 kfree(temp_unc);
2085 }
2086 if (rc == 0)
2087 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2088 pnum_referrals, nls_codepage, remap);
2089 /* BB map targetUNCs to dfs_info3 structures, here or
2090 in CIFSGetDFSRefer BB */
2091
2092 return rc;
2093 }
2094
2095 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2096 static struct lock_class_key cifs_key[2];
2097 static struct lock_class_key cifs_slock_key[2];
2098
2099 static inline void
2100 cifs_reclassify_socket4(struct socket *sock)
2101 {
2102 struct sock *sk = sock->sk;
2103 BUG_ON(sock_owned_by_user(sk));
2104 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2105 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2106 }
2107
2108 static inline void
2109 cifs_reclassify_socket6(struct socket *sock)
2110 {
2111 struct sock *sk = sock->sk;
2112 BUG_ON(sock_owned_by_user(sk));
2113 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2114 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2115 }
2116 #else
2117 static inline void
2118 cifs_reclassify_socket4(struct socket *sock)
2119 {
2120 }
2121
2122 static inline void
2123 cifs_reclassify_socket6(struct socket *sock)
2124 {
2125 }
2126 #endif
2127
2128 /* See RFC1001 section 14 on representation of Netbios names */
2129 static void rfc1002mangle(char *target, char *source, unsigned int length)
2130 {
2131 unsigned int i, j;
2132
2133 for (i = 0, j = 0; i < (length); i++) {
2134 /* mask a nibble at a time and encode */
2135 target[j] = 'A' + (0x0F & (source[i] >> 4));
2136 target[j+1] = 'A' + (0x0F & source[i]);
2137 j += 2;
2138 }
2139
2140 }
2141
2142 static int
2143 bind_socket(struct TCP_Server_Info *server)
2144 {
2145 int rc = 0;
2146 if (server->srcaddr.ss_family != AF_UNSPEC) {
2147 /* Bind to the specified local IP address */
2148 struct socket *socket = server->ssocket;
2149 rc = socket->ops->bind(socket,
2150 (struct sockaddr *) &server->srcaddr,
2151 sizeof(server->srcaddr));
2152 if (rc < 0) {
2153 struct sockaddr_in *saddr4;
2154 struct sockaddr_in6 *saddr6;
2155 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2156 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2157 if (saddr6->sin6_family == AF_INET6)
2158 cERROR(1, "cifs: "
2159 "Failed to bind to: %pI6c, error: %d\n",
2160 &saddr6->sin6_addr, rc);
2161 else
2162 cERROR(1, "cifs: "
2163 "Failed to bind to: %pI4, error: %d\n",
2164 &saddr4->sin_addr.s_addr, rc);
2165 }
2166 }
2167 return rc;
2168 }
2169
2170 static int
2171 ip_rfc1001_connect(struct TCP_Server_Info *server)
2172 {
2173 int rc = 0;
2174 /*
2175 * some servers require RFC1001 sessinit before sending
2176 * negprot - BB check reconnection in case where second
2177 * sessinit is sent but no second negprot
2178 */
2179 struct rfc1002_session_packet *ses_init_buf;
2180 struct smb_hdr *smb_buf;
2181 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2182 GFP_KERNEL);
2183 if (ses_init_buf) {
2184 ses_init_buf->trailer.session_req.called_len = 32;
2185
2186 if (server->server_RFC1001_name &&
2187 server->server_RFC1001_name[0] != 0)
2188 rfc1002mangle(ses_init_buf->trailer.
2189 session_req.called_name,
2190 server->server_RFC1001_name,
2191 RFC1001_NAME_LEN_WITH_NULL);
2192 else
2193 rfc1002mangle(ses_init_buf->trailer.
2194 session_req.called_name,
2195 DEFAULT_CIFS_CALLED_NAME,
2196 RFC1001_NAME_LEN_WITH_NULL);
2197
2198 ses_init_buf->trailer.session_req.calling_len = 32;
2199
2200 /*
2201 * calling name ends in null (byte 16) from old smb
2202 * convention.
2203 */
2204 if (server->workstation_RFC1001_name &&
2205 server->workstation_RFC1001_name[0] != 0)
2206 rfc1002mangle(ses_init_buf->trailer.
2207 session_req.calling_name,
2208 server->workstation_RFC1001_name,
2209 RFC1001_NAME_LEN_WITH_NULL);
2210 else
2211 rfc1002mangle(ses_init_buf->trailer.
2212 session_req.calling_name,
2213 "LINUX_CIFS_CLNT",
2214 RFC1001_NAME_LEN_WITH_NULL);
2215
2216 ses_init_buf->trailer.session_req.scope1 = 0;
2217 ses_init_buf->trailer.session_req.scope2 = 0;
2218 smb_buf = (struct smb_hdr *)ses_init_buf;
2219
2220 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2221 smb_buf->smb_buf_length = 0x81000044;
2222 rc = smb_send(server, smb_buf, 0x44);
2223 kfree(ses_init_buf);
2224 /*
2225 * RFC1001 layer in at least one server
2226 * requires very short break before negprot
2227 * presumably because not expecting negprot
2228 * to follow so fast. This is a simple
2229 * solution that works without
2230 * complicating the code and causes no
2231 * significant slowing down on mount
2232 * for everyone else
2233 */
2234 usleep_range(1000, 2000);
2235 }
2236 /*
2237 * else the negprot may still work without this
2238 * even though malloc failed
2239 */
2240
2241 return rc;
2242 }
2243
2244 static int
2245 generic_ip_connect(struct TCP_Server_Info *server)
2246 {
2247 int rc = 0;
2248 unsigned short int sport;
2249 int slen, sfamily;
2250 struct socket *socket = server->ssocket;
2251 struct sockaddr *saddr;
2252
2253 saddr = (struct sockaddr *) &server->dstaddr;
2254
2255 if (server->dstaddr.ss_family == AF_INET6) {
2256 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2257 slen = sizeof(struct sockaddr_in6);
2258 sfamily = AF_INET6;
2259 } else {
2260 sport = ((struct sockaddr_in *) saddr)->sin_port;
2261 slen = sizeof(struct sockaddr_in);
2262 sfamily = AF_INET;
2263 }
2264
2265 if (socket == NULL) {
2266 rc = sock_create_kern(sfamily, SOCK_STREAM,
2267 IPPROTO_TCP, &socket);
2268 if (rc < 0) {
2269 cERROR(1, "Error %d creating socket", rc);
2270 server->ssocket = NULL;
2271 return rc;
2272 }
2273
2274 /* BB other socket options to set KEEPALIVE, NODELAY? */
2275 cFYI(1, "Socket created");
2276 server->ssocket = socket;
2277 socket->sk->sk_allocation = GFP_NOFS;
2278 if (sfamily == AF_INET6)
2279 cifs_reclassify_socket6(socket);
2280 else
2281 cifs_reclassify_socket4(socket);
2282 }
2283
2284 rc = bind_socket(server);
2285 if (rc < 0)
2286 return rc;
2287
2288 rc = socket->ops->connect(socket, saddr, slen, 0);
2289 if (rc < 0) {
2290 cFYI(1, "Error %d connecting to server", rc);
2291 sock_release(socket);
2292 server->ssocket = NULL;
2293 return rc;
2294 }
2295
2296 /*
2297 * Eventually check for other socket options to change from
2298 * the default. sock_setsockopt not used because it expects
2299 * user space buffer
2300 */
2301 socket->sk->sk_rcvtimeo = 7 * HZ;
2302 socket->sk->sk_sndtimeo = 5 * HZ;
2303
2304 /* make the bufsizes depend on wsize/rsize and max requests */
2305 if (server->noautotune) {
2306 if (socket->sk->sk_sndbuf < (200 * 1024))
2307 socket->sk->sk_sndbuf = 200 * 1024;
2308 if (socket->sk->sk_rcvbuf < (140 * 1024))
2309 socket->sk->sk_rcvbuf = 140 * 1024;
2310 }
2311
2312 if (server->tcp_nodelay) {
2313 int val = 1;
2314 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2315 (char *)&val, sizeof(val));
2316 if (rc)
2317 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2318 }
2319
2320 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2321 socket->sk->sk_sndbuf,
2322 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2323
2324 if (sport == htons(RFC1001_PORT))
2325 rc = ip_rfc1001_connect(server);
2326
2327 return rc;
2328 }
2329
2330 static int
2331 ip_connect(struct TCP_Server_Info *server)
2332 {
2333 unsigned short int *sport;
2334 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2335 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2336
2337 if (server->dstaddr.ss_family == AF_INET6)
2338 sport = &addr6->sin6_port;
2339 else
2340 sport = &addr->sin_port;
2341
2342 if (*sport == 0) {
2343 int rc;
2344
2345 /* try with 445 port at first */
2346 *sport = htons(CIFS_PORT);
2347
2348 rc = generic_ip_connect(server);
2349 if (rc >= 0)
2350 return rc;
2351
2352 /* if it failed, try with 139 port */
2353 *sport = htons(RFC1001_PORT);
2354 }
2355
2356 return generic_ip_connect(server);
2357 }
2358
2359 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2360 struct super_block *sb, struct smb_vol *vol_info)
2361 {
2362 /* if we are reconnecting then should we check to see if
2363 * any requested capabilities changed locally e.g. via
2364 * remount but we can not do much about it here
2365 * if they have (even if we could detect it by the following)
2366 * Perhaps we could add a backpointer to array of sb from tcon
2367 * or if we change to make all sb to same share the same
2368 * sb as NFS - then we only have one backpointer to sb.
2369 * What if we wanted to mount the server share twice once with
2370 * and once without posixacls or posix paths? */
2371 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2372
2373 if (vol_info && vol_info->no_linux_ext) {
2374 tcon->fsUnixInfo.Capability = 0;
2375 tcon->unix_ext = 0; /* Unix Extensions disabled */
2376 cFYI(1, "Linux protocol extensions disabled");
2377 return;
2378 } else if (vol_info)
2379 tcon->unix_ext = 1; /* Unix Extensions supported */
2380
2381 if (tcon->unix_ext == 0) {
2382 cFYI(1, "Unix extensions disabled so not set on reconnect");
2383 return;
2384 }
2385
2386 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2387 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2388
2389 /* check for reconnect case in which we do not
2390 want to change the mount behavior if we can avoid it */
2391 if (vol_info == NULL) {
2392 /* turn off POSIX ACL and PATHNAMES if not set
2393 originally at mount time */
2394 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2395 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2396 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2397 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2398 cERROR(1, "POSIXPATH support change");
2399 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2400 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2401 cERROR(1, "possible reconnect error");
2402 cERROR(1, "server disabled POSIX path support");
2403 }
2404 }
2405
2406 cap &= CIFS_UNIX_CAP_MASK;
2407 if (vol_info && vol_info->no_psx_acl)
2408 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2409 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2410 cFYI(1, "negotiated posix acl support");
2411 if (sb)
2412 sb->s_flags |= MS_POSIXACL;
2413 }
2414
2415 if (vol_info && vol_info->posix_paths == 0)
2416 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2417 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2418 cFYI(1, "negotiate posix pathnames");
2419 if (sb)
2420 CIFS_SB(sb)->mnt_cifs_flags |=
2421 CIFS_MOUNT_POSIX_PATHS;
2422 }
2423
2424 /* We might be setting the path sep back to a different
2425 form if we are reconnecting and the server switched its
2426 posix path capability for this share */
2427 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2428 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2429
2430 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2431 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2432 CIFS_SB(sb)->rsize = 127 * 1024;
2433 cFYI(DBG2, "larger reads not supported by srv");
2434 }
2435 }
2436
2437
2438 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2439 #ifdef CONFIG_CIFS_DEBUG2
2440 if (cap & CIFS_UNIX_FCNTL_CAP)
2441 cFYI(1, "FCNTL cap");
2442 if (cap & CIFS_UNIX_EXTATTR_CAP)
2443 cFYI(1, "EXTATTR cap");
2444 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2445 cFYI(1, "POSIX path cap");
2446 if (cap & CIFS_UNIX_XATTR_CAP)
2447 cFYI(1, "XATTR cap");
2448 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2449 cFYI(1, "POSIX ACL cap");
2450 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2451 cFYI(1, "very large read cap");
2452 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2453 cFYI(1, "very large write cap");
2454 #endif /* CIFS_DEBUG2 */
2455 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2456 if (vol_info == NULL) {
2457 cFYI(1, "resetting capabilities failed");
2458 } else
2459 cERROR(1, "Negotiating Unix capabilities "
2460 "with the server failed. Consider "
2461 "mounting with the Unix Extensions\n"
2462 "disabled, if problems are found, "
2463 "by specifying the nounix mount "
2464 "option.");
2465
2466 }
2467 }
2468 }
2469
2470 static void
2471 convert_delimiter(char *path, char delim)
2472 {
2473 int i;
2474 char old_delim;
2475
2476 if (path == NULL)
2477 return;
2478
2479 if (delim == '/')
2480 old_delim = '\\';
2481 else
2482 old_delim = '/';
2483
2484 for (i = 0; path[i] != '\0'; i++) {
2485 if (path[i] == old_delim)
2486 path[i] = delim;
2487 }
2488 }
2489
2490 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2491 struct cifs_sb_info *cifs_sb)
2492 {
2493 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2494
2495 if (pvolume_info->rsize > CIFSMaxBufSize) {
2496 cERROR(1, "rsize %d too large, using MaxBufSize",
2497 pvolume_info->rsize);
2498 cifs_sb->rsize = CIFSMaxBufSize;
2499 } else if ((pvolume_info->rsize) &&
2500 (pvolume_info->rsize <= CIFSMaxBufSize))
2501 cifs_sb->rsize = pvolume_info->rsize;
2502 else /* default */
2503 cifs_sb->rsize = CIFSMaxBufSize;
2504
2505 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2506 cERROR(1, "wsize %d too large, using 4096 instead",
2507 pvolume_info->wsize);
2508 cifs_sb->wsize = 4096;
2509 } else if (pvolume_info->wsize)
2510 cifs_sb->wsize = pvolume_info->wsize;
2511 else
2512 cifs_sb->wsize = min_t(const int,
2513 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2514 127*1024);
2515 /* old default of CIFSMaxBufSize was too small now
2516 that SMB Write2 can send multiple pages in kvec.
2517 RFC1001 does not describe what happens when frame
2518 bigger than 128K is sent so use that as max in
2519 conjunction with 52K kvec constraint on arch with 4K
2520 page size */
2521
2522 if (cifs_sb->rsize < 2048) {
2523 cifs_sb->rsize = 2048;
2524 /* Windows ME may prefer this */
2525 cFYI(1, "readsize set to minimum: 2048");
2526 }
2527 /* calculate prepath */
2528 cifs_sb->prepath = pvolume_info->prepath;
2529 if (cifs_sb->prepath) {
2530 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2531 /* we can not convert the / to \ in the path
2532 separators in the prefixpath yet because we do not
2533 know (until reset_cifs_unix_caps is called later)
2534 whether POSIX PATH CAP is available. We normalize
2535 the / to \ after reset_cifs_unix_caps is called */
2536 pvolume_info->prepath = NULL;
2537 } else
2538 cifs_sb->prepathlen = 0;
2539 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2540 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2541 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2542 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2543 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2544 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2545
2546 cifs_sb->actimeo = pvolume_info->actimeo;
2547
2548 if (pvolume_info->noperm)
2549 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2550 if (pvolume_info->setuids)
2551 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2552 if (pvolume_info->server_ino)
2553 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2554 if (pvolume_info->remap)
2555 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2556 if (pvolume_info->no_xattr)
2557 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2558 if (pvolume_info->sfu_emul)
2559 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2560 if (pvolume_info->nobrl)
2561 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2562 if (pvolume_info->nostrictsync)
2563 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2564 if (pvolume_info->mand_lock)
2565 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2566 if (pvolume_info->cifs_acl)
2567 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2568 if (pvolume_info->override_uid)
2569 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2570 if (pvolume_info->override_gid)
2571 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2572 if (pvolume_info->dynperm)
2573 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2574 if (pvolume_info->fsc)
2575 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2576 if (pvolume_info->multiuser)
2577 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2578 CIFS_MOUNT_NO_PERM);
2579 if (pvolume_info->direct_io) {
2580 cFYI(1, "mounting share using direct i/o");
2581 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2582 }
2583 if (pvolume_info->mfsymlinks) {
2584 if (pvolume_info->sfu_emul) {
2585 cERROR(1, "mount option mfsymlinks ignored if sfu "
2586 "mount option is used");
2587 } else {
2588 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2589 }
2590 }
2591
2592 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2593 cERROR(1, "mount option dynperm ignored if cifsacl "
2594 "mount option supported");
2595 }
2596
2597 static int
2598 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2599 struct cifs_sb_info *cifs_sb, const char *full_path)
2600 {
2601 int rc;
2602 FILE_ALL_INFO *pfile_info;
2603
2604 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2605 if (pfile_info == NULL)
2606 return -ENOMEM;
2607
2608 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2609 0 /* not legacy */, cifs_sb->local_nls,
2610 cifs_sb->mnt_cifs_flags &
2611 CIFS_MOUNT_MAP_SPECIAL_CHR);
2612 kfree(pfile_info);
2613 return rc;
2614 }
2615
2616 static void
2617 cleanup_volume_info(struct smb_vol **pvolume_info)
2618 {
2619 struct smb_vol *volume_info;
2620
2621 if (!pvolume_info || !*pvolume_info)
2622 return;
2623
2624 volume_info = *pvolume_info;
2625 kzfree(volume_info->password);
2626 kfree(volume_info->UNC);
2627 kfree(volume_info->prepath);
2628 kfree(volume_info);
2629 *pvolume_info = NULL;
2630 return;
2631 }
2632
2633 #ifdef CONFIG_CIFS_DFS_UPCALL
2634 /* build_path_to_root returns full path to root when
2635 * we do not have an exiting connection (tcon) */
2636 static char *
2637 build_unc_path_to_root(const struct smb_vol *volume_info,
2638 const struct cifs_sb_info *cifs_sb)
2639 {
2640 char *full_path;
2641
2642 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2643 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2644 if (full_path == NULL)
2645 return ERR_PTR(-ENOMEM);
2646
2647 strncpy(full_path, volume_info->UNC, unc_len);
2648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2649 int i;
2650 for (i = 0; i < unc_len; i++) {
2651 if (full_path[i] == '\\')
2652 full_path[i] = '/';
2653 }
2654 }
2655
2656 if (cifs_sb->prepathlen)
2657 strncpy(full_path + unc_len, cifs_sb->prepath,
2658 cifs_sb->prepathlen);
2659
2660 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2661 return full_path;
2662 }
2663 #endif
2664
2665 int
2666 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2667 char *mount_data_global, const char *devname)
2668 {
2669 int rc;
2670 int xid;
2671 struct smb_vol *volume_info;
2672 struct cifsSesInfo *pSesInfo;
2673 struct cifsTconInfo *tcon;
2674 struct TCP_Server_Info *srvTcp;
2675 char *full_path;
2676 char *mount_data = mount_data_global;
2677 struct tcon_link *tlink;
2678 #ifdef CONFIG_CIFS_DFS_UPCALL
2679 struct dfs_info3_param *referrals = NULL;
2680 unsigned int num_referrals = 0;
2681 int referral_walks_count = 0;
2682 try_mount_again:
2683 #endif
2684 rc = 0;
2685 tcon = NULL;
2686 pSesInfo = NULL;
2687 srvTcp = NULL;
2688 full_path = NULL;
2689 tlink = NULL;
2690
2691 xid = GetXid();
2692
2693 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2694 if (!volume_info) {
2695 rc = -ENOMEM;
2696 goto out;
2697 }
2698
2699 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2700 rc = -EINVAL;
2701 goto out;
2702 }
2703
2704 if (volume_info->nullauth) {
2705 cFYI(1, "null user");
2706 volume_info->username = "";
2707 } else if (volume_info->username) {
2708 /* BB fixme parse for domain name here */
2709 cFYI(1, "Username: %s", volume_info->username);
2710 } else {
2711 cifserror("No username specified");
2712 /* In userspace mount helper we can get user name from alternate
2713 locations such as env variables and files on disk */
2714 rc = -EINVAL;
2715 goto out;
2716 }
2717
2718 /* this is needed for ASCII cp to Unicode converts */
2719 if (volume_info->iocharset == NULL) {
2720 /* load_nls_default cannot return null */
2721 volume_info->local_nls = load_nls_default();
2722 } else {
2723 volume_info->local_nls = load_nls(volume_info->iocharset);
2724 if (volume_info->local_nls == NULL) {
2725 cERROR(1, "CIFS mount error: iocharset %s not found",
2726 volume_info->iocharset);
2727 rc = -ELIBACC;
2728 goto out;
2729 }
2730 }
2731 cifs_sb->local_nls = volume_info->local_nls;
2732
2733 /* get a reference to a tcp session */
2734 srvTcp = cifs_get_tcp_session(volume_info);
2735 if (IS_ERR(srvTcp)) {
2736 rc = PTR_ERR(srvTcp);
2737 goto out;
2738 }
2739
2740 /* get a reference to a SMB session */
2741 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2742 if (IS_ERR(pSesInfo)) {
2743 rc = PTR_ERR(pSesInfo);
2744 pSesInfo = NULL;
2745 goto mount_fail_check;
2746 }
2747
2748 setup_cifs_sb(volume_info, cifs_sb);
2749 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2750 sb->s_maxbytes = MAX_LFS_FILESIZE;
2751 else
2752 sb->s_maxbytes = MAX_NON_LFS;
2753
2754 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2755 sb->s_time_gran = 100;
2756
2757 /* search for existing tcon to this server share */
2758 tcon = cifs_get_tcon(pSesInfo, volume_info);
2759 if (IS_ERR(tcon)) {
2760 rc = PTR_ERR(tcon);
2761 tcon = NULL;
2762 goto remote_path_check;
2763 }
2764
2765 /* do not care if following two calls succeed - informational */
2766 if (!tcon->ipc) {
2767 CIFSSMBQFSDeviceInfo(xid, tcon);
2768 CIFSSMBQFSAttributeInfo(xid, tcon);
2769 }
2770
2771 /* tell server which Unix caps we support */
2772 if (tcon->ses->capabilities & CAP_UNIX)
2773 /* reset of caps checks mount to see if unix extensions
2774 disabled for just this mount */
2775 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2776 else
2777 tcon->unix_ext = 0; /* server does not support them */
2778
2779 /* convert forward to back slashes in prepath here if needed */
2780 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2781 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2782
2783 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2784 cifs_sb->rsize = 1024 * 127;
2785 cFYI(DBG2, "no very large read support, rsize now 127K");
2786 }
2787 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2788 cifs_sb->wsize = min(cifs_sb->wsize,
2789 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2790 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2791 cifs_sb->rsize = min(cifs_sb->rsize,
2792 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2793
2794 remote_path_check:
2795 /* check if a whole path (including prepath) is not remote */
2796 if (!rc && cifs_sb->prepathlen && tcon) {
2797 /* build_path_to_root works only when we have a valid tcon */
2798 full_path = cifs_build_path_to_root(cifs_sb, tcon);
2799 if (full_path == NULL) {
2800 rc = -ENOMEM;
2801 goto mount_fail_check;
2802 }
2803 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2804 if (rc != 0 && rc != -EREMOTE) {
2805 kfree(full_path);
2806 goto mount_fail_check;
2807 }
2808 kfree(full_path);
2809 }
2810
2811 /* get referral if needed */
2812 if (rc == -EREMOTE) {
2813 #ifdef CONFIG_CIFS_DFS_UPCALL
2814 if (referral_walks_count > MAX_NESTED_LINKS) {
2815 /*
2816 * BB: when we implement proper loop detection,
2817 * we will remove this check. But now we need it
2818 * to prevent an indefinite loop if 'DFS tree' is
2819 * misconfigured (i.e. has loops).
2820 */
2821 rc = -ELOOP;
2822 goto mount_fail_check;
2823 }
2824 /* convert forward to back slashes in prepath here if needed */
2825 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2826 convert_delimiter(cifs_sb->prepath,
2827 CIFS_DIR_SEP(cifs_sb));
2828 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2829 if (IS_ERR(full_path)) {
2830 rc = PTR_ERR(full_path);
2831 goto mount_fail_check;
2832 }
2833
2834 cFYI(1, "Getting referral for: %s", full_path);
2835 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2836 cifs_sb->local_nls, &num_referrals, &referrals,
2837 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2838 if (!rc && num_referrals > 0) {
2839 char *fake_devname = NULL;
2840
2841 if (mount_data != mount_data_global)
2842 kfree(mount_data);
2843
2844 mount_data = cifs_compose_mount_options(
2845 cifs_sb->mountdata, full_path + 1,
2846 referrals, &fake_devname);
2847
2848 free_dfs_info_array(referrals, num_referrals);
2849 kfree(fake_devname);
2850 kfree(full_path);
2851
2852 if (IS_ERR(mount_data)) {
2853 rc = PTR_ERR(mount_data);
2854 mount_data = NULL;
2855 goto mount_fail_check;
2856 }
2857
2858 if (tcon)
2859 cifs_put_tcon(tcon);
2860 else if (pSesInfo)
2861 cifs_put_smb_ses(pSesInfo);
2862
2863 cleanup_volume_info(&volume_info);
2864 referral_walks_count++;
2865 FreeXid(xid);
2866 goto try_mount_again;
2867 }
2868 #else /* No DFS support, return error on mount */
2869 rc = -EOPNOTSUPP;
2870 #endif
2871 }
2872
2873 if (rc)
2874 goto mount_fail_check;
2875
2876 /* now, hang the tcon off of the superblock */
2877 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2878 if (tlink == NULL) {
2879 rc = -ENOMEM;
2880 goto mount_fail_check;
2881 }
2882
2883 tlink->tl_uid = pSesInfo->linux_uid;
2884 tlink->tl_tcon = tcon;
2885 tlink->tl_time = jiffies;
2886 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2887 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2888
2889 cifs_sb->master_tlink = tlink;
2890 spin_lock(&cifs_sb->tlink_tree_lock);
2891 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
2892 spin_unlock(&cifs_sb->tlink_tree_lock);
2893
2894 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
2895 TLINK_IDLE_EXPIRE);
2896
2897 mount_fail_check:
2898 /* on error free sesinfo and tcon struct if needed */
2899 if (rc) {
2900 if (mount_data != mount_data_global)
2901 kfree(mount_data);
2902 /* If find_unc succeeded then rc == 0 so we can not end */
2903 /* up accidently freeing someone elses tcon struct */
2904 if (tcon)
2905 cifs_put_tcon(tcon);
2906 else if (pSesInfo)
2907 cifs_put_smb_ses(pSesInfo);
2908 else
2909 cifs_put_tcp_session(srvTcp);
2910 goto out;
2911 }
2912
2913 /* volume_info->password is freed above when existing session found
2914 (in which case it is not needed anymore) but when new sesion is created
2915 the password ptr is put in the new session structure (in which case the
2916 password will be freed at unmount time) */
2917 out:
2918 /* zero out password before freeing */
2919 cleanup_volume_info(&volume_info);
2920 FreeXid(xid);
2921 return rc;
2922 }
2923
2924 int
2925 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2926 const char *tree, struct cifsTconInfo *tcon,
2927 const struct nls_table *nls_codepage)
2928 {
2929 struct smb_hdr *smb_buffer;
2930 struct smb_hdr *smb_buffer_response;
2931 TCONX_REQ *pSMB;
2932 TCONX_RSP *pSMBr;
2933 unsigned char *bcc_ptr;
2934 int rc = 0;
2935 int length;
2936 __u16 bytes_left, count;
2937
2938 if (ses == NULL)
2939 return -EIO;
2940
2941 smb_buffer = cifs_buf_get();
2942 if (smb_buffer == NULL)
2943 return -ENOMEM;
2944
2945 smb_buffer_response = smb_buffer;
2946
2947 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2948 NULL /*no tid */ , 4 /*wct */ );
2949
2950 smb_buffer->Mid = GetNextMid(ses->server);
2951 smb_buffer->Uid = ses->Suid;
2952 pSMB = (TCONX_REQ *) smb_buffer;
2953 pSMBr = (TCONX_RSP *) smb_buffer_response;
2954
2955 pSMB->AndXCommand = 0xFF;
2956 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2957 bcc_ptr = &pSMB->Password[0];
2958 if ((ses->server->secMode) & SECMODE_USER) {
2959 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2960 *bcc_ptr = 0; /* password is null byte */
2961 bcc_ptr++; /* skip password */
2962 /* already aligned so no need to do it below */
2963 } else {
2964 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
2965 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2966 specified as required (when that support is added to
2967 the vfs in the future) as only NTLM or the much
2968 weaker LANMAN (which we do not send by default) is accepted
2969 by Samba (not sure whether other servers allow
2970 NTLMv2 password here) */
2971 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2972 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2973 (ses->server->secType == LANMAN))
2974 calc_lanman_hash(tcon->password, ses->server->cryptkey,
2975 ses->server->secMode &
2976 SECMODE_PW_ENCRYPT ? true : false,
2977 bcc_ptr);
2978 else
2979 #endif /* CIFS_WEAK_PW_HASH */
2980 SMBNTencrypt(tcon->password, ses->server->cryptkey, bcc_ptr);
2981
2982 bcc_ptr += CIFS_AUTH_RESP_SIZE;
2983 if (ses->capabilities & CAP_UNICODE) {
2984 /* must align unicode strings */
2985 *bcc_ptr = 0; /* null byte password */
2986 bcc_ptr++;
2987 }
2988 }
2989
2990 if (ses->server->secMode &
2991 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2992 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2993
2994 if (ses->capabilities & CAP_STATUS32) {
2995 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2996 }
2997 if (ses->capabilities & CAP_DFS) {
2998 smb_buffer->Flags2 |= SMBFLG2_DFS;
2999 }
3000 if (ses->capabilities & CAP_UNICODE) {
3001 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3002 length =
3003 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3004 6 /* max utf8 char length in bytes */ *
3005 (/* server len*/ + 256 /* share len */), nls_codepage);
3006 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3007 bcc_ptr += 2; /* skip trailing null */
3008 } else { /* ASCII */
3009 strcpy(bcc_ptr, tree);
3010 bcc_ptr += strlen(tree) + 1;
3011 }
3012 strcpy(bcc_ptr, "?????");
3013 bcc_ptr += strlen("?????");
3014 bcc_ptr += 1;
3015 count = bcc_ptr - &pSMB->Password[0];
3016 pSMB->hdr.smb_buf_length += count;
3017 pSMB->ByteCount = cpu_to_le16(count);
3018
3019 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3020 0);
3021
3022 /* above now done in SendReceive */
3023 if ((rc == 0) && (tcon != NULL)) {
3024 bool is_unicode;
3025
3026 tcon->tidStatus = CifsGood;
3027 tcon->need_reconnect = false;
3028 tcon->tid = smb_buffer_response->Tid;
3029 bcc_ptr = pByteArea(smb_buffer_response);
3030 bytes_left = get_bcc(smb_buffer_response);
3031 length = strnlen(bcc_ptr, bytes_left - 2);
3032 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3033 is_unicode = true;
3034 else
3035 is_unicode = false;
3036
3037
3038 /* skip service field (NB: this field is always ASCII) */
3039 if (length == 3) {
3040 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3041 (bcc_ptr[2] == 'C')) {
3042 cFYI(1, "IPC connection");
3043 tcon->ipc = 1;
3044 }
3045 } else if (length == 2) {
3046 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3047 /* the most common case */
3048 cFYI(1, "disk share connection");
3049 }
3050 }
3051 bcc_ptr += length + 1;
3052 bytes_left -= (length + 1);
3053 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3054
3055 /* mostly informational -- no need to fail on error here */
3056 kfree(tcon->nativeFileSystem);
3057 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3058 bytes_left, is_unicode,
3059 nls_codepage);
3060
3061 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3062
3063 if ((smb_buffer_response->WordCount == 3) ||
3064 (smb_buffer_response->WordCount == 7))
3065 /* field is in same location */
3066 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3067 else
3068 tcon->Flags = 0;
3069 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3070 } else if ((rc == 0) && tcon == NULL) {
3071 /* all we need to save for IPC$ connection */
3072 ses->ipc_tid = smb_buffer_response->Tid;
3073 }
3074
3075 cifs_buf_release(smb_buffer);
3076 return rc;
3077 }
3078
3079 int
3080 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3081 {
3082 struct rb_root *root = &cifs_sb->tlink_tree;
3083 struct rb_node *node;
3084 struct tcon_link *tlink;
3085 char *tmp;
3086
3087 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3088
3089 spin_lock(&cifs_sb->tlink_tree_lock);
3090 while ((node = rb_first(root))) {
3091 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3092 cifs_get_tlink(tlink);
3093 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3094 rb_erase(node, root);
3095
3096 spin_unlock(&cifs_sb->tlink_tree_lock);
3097 cifs_put_tlink(tlink);
3098 spin_lock(&cifs_sb->tlink_tree_lock);
3099 }
3100 spin_unlock(&cifs_sb->tlink_tree_lock);
3101
3102 tmp = cifs_sb->prepath;
3103 cifs_sb->prepathlen = 0;
3104 cifs_sb->prepath = NULL;
3105 kfree(tmp);
3106
3107 return 0;
3108 }
3109
3110 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3111 {
3112 int rc = 0;
3113 struct TCP_Server_Info *server = ses->server;
3114
3115 /* only send once per connect */
3116 if (server->maxBuf != 0)
3117 return 0;
3118
3119 rc = CIFSSMBNegotiate(xid, ses);
3120 if (rc == -EAGAIN) {
3121 /* retry only once on 1st time connection */
3122 rc = CIFSSMBNegotiate(xid, ses);
3123 if (rc == -EAGAIN)
3124 rc = -EHOSTDOWN;
3125 }
3126 if (rc == 0) {
3127 spin_lock(&GlobalMid_Lock);
3128 if (server->tcpStatus != CifsExiting)
3129 server->tcpStatus = CifsGood;
3130 else
3131 rc = -EHOSTDOWN;
3132 spin_unlock(&GlobalMid_Lock);
3133
3134 }
3135
3136 return rc;
3137 }
3138
3139
3140 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3141 struct nls_table *nls_info)
3142 {
3143 int rc = 0;
3144 struct TCP_Server_Info *server = ses->server;
3145
3146 ses->flags = 0;
3147 ses->capabilities = server->capabilities;
3148 if (linuxExtEnabled == 0)
3149 ses->capabilities &= (~CAP_UNIX);
3150
3151 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3152 server->secMode, server->capabilities, server->timeAdj);
3153
3154 rc = CIFS_SessSetup(xid, ses, nls_info);
3155 if (rc) {
3156 cERROR(1, "Send error in SessSetup = %d", rc);
3157 } else {
3158 mutex_lock(&ses->server->srv_mutex);
3159 if (!server->session_estab) {
3160 server->session_key.response = ses->auth_key.response;
3161 server->session_key.len = ses->auth_key.len;
3162 server->sequence_number = 0x2;
3163 server->session_estab = true;
3164 ses->auth_key.response = NULL;
3165 }
3166 mutex_unlock(&server->srv_mutex);
3167
3168 cFYI(1, "CIFS Session Established successfully");
3169 spin_lock(&GlobalMid_Lock);
3170 ses->status = CifsGood;
3171 ses->need_reconnect = false;
3172 spin_unlock(&GlobalMid_Lock);
3173 }
3174
3175 kfree(ses->auth_key.response);
3176 ses->auth_key.response = NULL;
3177 ses->auth_key.len = 0;
3178 kfree(ses->ntlmssp);
3179 ses->ntlmssp = NULL;
3180
3181 return rc;
3182 }
3183
3184 static struct cifsTconInfo *
3185 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3186 {
3187 struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3188 struct cifsSesInfo *ses;
3189 struct cifsTconInfo *tcon = NULL;
3190 struct smb_vol *vol_info;
3191 char username[MAX_USERNAME_SIZE + 1];
3192
3193 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3194 if (vol_info == NULL) {
3195 tcon = ERR_PTR(-ENOMEM);
3196 goto out;
3197 }
3198
3199 snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3200 vol_info->username = username;
3201 vol_info->local_nls = cifs_sb->local_nls;
3202 vol_info->linux_uid = fsuid;
3203 vol_info->cred_uid = fsuid;
3204 vol_info->UNC = master_tcon->treeName;
3205 vol_info->retry = master_tcon->retry;
3206 vol_info->nocase = master_tcon->nocase;
3207 vol_info->local_lease = master_tcon->local_lease;
3208 vol_info->no_linux_ext = !master_tcon->unix_ext;
3209
3210 /* FIXME: allow for other secFlg settings */
3211 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3212
3213 /* get a reference for the same TCP session */
3214 spin_lock(&cifs_tcp_ses_lock);
3215 ++master_tcon->ses->server->srv_count;
3216 spin_unlock(&cifs_tcp_ses_lock);
3217
3218 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3219 if (IS_ERR(ses)) {
3220 tcon = (struct cifsTconInfo *)ses;
3221 cifs_put_tcp_session(master_tcon->ses->server);
3222 goto out;
3223 }
3224
3225 tcon = cifs_get_tcon(ses, vol_info);
3226 if (IS_ERR(tcon)) {
3227 cifs_put_smb_ses(ses);
3228 goto out;
3229 }
3230
3231 if (ses->capabilities & CAP_UNIX)
3232 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3233 out:
3234 kfree(vol_info);
3235
3236 return tcon;
3237 }
3238
3239 static inline struct tcon_link *
3240 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3241 {
3242 return cifs_sb->master_tlink;
3243 }
3244
3245 struct cifsTconInfo *
3246 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3247 {
3248 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3249 }
3250
3251 static int
3252 cifs_sb_tcon_pending_wait(void *unused)
3253 {
3254 schedule();
3255 return signal_pending(current) ? -ERESTARTSYS : 0;
3256 }
3257
3258 /* find and return a tlink with given uid */
3259 static struct tcon_link *
3260 tlink_rb_search(struct rb_root *root, uid_t uid)
3261 {
3262 struct rb_node *node = root->rb_node;
3263 struct tcon_link *tlink;
3264
3265 while (node) {
3266 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3267
3268 if (tlink->tl_uid > uid)
3269 node = node->rb_left;
3270 else if (tlink->tl_uid < uid)
3271 node = node->rb_right;
3272 else
3273 return tlink;
3274 }
3275 return NULL;
3276 }
3277
3278 /* insert a tcon_link into the tree */
3279 static void
3280 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3281 {
3282 struct rb_node **new = &(root->rb_node), *parent = NULL;
3283 struct tcon_link *tlink;
3284
3285 while (*new) {
3286 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3287 parent = *new;
3288
3289 if (tlink->tl_uid > new_tlink->tl_uid)
3290 new = &((*new)->rb_left);
3291 else
3292 new = &((*new)->rb_right);
3293 }
3294
3295 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3296 rb_insert_color(&new_tlink->tl_rbnode, root);
3297 }
3298
3299 /*
3300 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3301 * current task.
3302 *
3303 * If the superblock doesn't refer to a multiuser mount, then just return
3304 * the master tcon for the mount.
3305 *
3306 * First, search the rbtree for an existing tcon for this fsuid. If one
3307 * exists, then check to see if it's pending construction. If it is then wait
3308 * for construction to complete. Once it's no longer pending, check to see if
3309 * it failed and either return an error or retry construction, depending on
3310 * the timeout.
3311 *
3312 * If one doesn't exist then insert a new tcon_link struct into the tree and
3313 * try to construct a new one.
3314 */
3315 struct tcon_link *
3316 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3317 {
3318 int ret;
3319 uid_t fsuid = current_fsuid();
3320 struct tcon_link *tlink, *newtlink;
3321
3322 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3323 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3324
3325 spin_lock(&cifs_sb->tlink_tree_lock);
3326 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3327 if (tlink)
3328 cifs_get_tlink(tlink);
3329 spin_unlock(&cifs_sb->tlink_tree_lock);
3330
3331 if (tlink == NULL) {
3332 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3333 if (newtlink == NULL)
3334 return ERR_PTR(-ENOMEM);
3335 newtlink->tl_uid = fsuid;
3336 newtlink->tl_tcon = ERR_PTR(-EACCES);
3337 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3338 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3339 cifs_get_tlink(newtlink);
3340
3341 spin_lock(&cifs_sb->tlink_tree_lock);
3342 /* was one inserted after previous search? */
3343 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3344 if (tlink) {
3345 cifs_get_tlink(tlink);
3346 spin_unlock(&cifs_sb->tlink_tree_lock);
3347 kfree(newtlink);
3348 goto wait_for_construction;
3349 }
3350 tlink = newtlink;
3351 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3352 spin_unlock(&cifs_sb->tlink_tree_lock);
3353 } else {
3354 wait_for_construction:
3355 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3356 cifs_sb_tcon_pending_wait,
3357 TASK_INTERRUPTIBLE);
3358 if (ret) {
3359 cifs_put_tlink(tlink);
3360 return ERR_PTR(ret);
3361 }
3362
3363 /* if it's good, return it */
3364 if (!IS_ERR(tlink->tl_tcon))
3365 return tlink;
3366
3367 /* return error if we tried this already recently */
3368 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3369 cifs_put_tlink(tlink);
3370 return ERR_PTR(-EACCES);
3371 }
3372
3373 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3374 goto wait_for_construction;
3375 }
3376
3377 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3378 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3379 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3380
3381 if (IS_ERR(tlink->tl_tcon)) {
3382 cifs_put_tlink(tlink);
3383 return ERR_PTR(-EACCES);
3384 }
3385
3386 return tlink;
3387 }
3388
3389 /*
3390 * periodic workqueue job that scans tcon_tree for a superblock and closes
3391 * out tcons.
3392 */
3393 static void
3394 cifs_prune_tlinks(struct work_struct *work)
3395 {
3396 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3397 prune_tlinks.work);
3398 struct rb_root *root = &cifs_sb->tlink_tree;
3399 struct rb_node *node = rb_first(root);
3400 struct rb_node *tmp;
3401 struct tcon_link *tlink;
3402
3403 /*
3404 * Because we drop the spinlock in the loop in order to put the tlink
3405 * it's not guarded against removal of links from the tree. The only
3406 * places that remove entries from the tree are this function and
3407 * umounts. Because this function is non-reentrant and is canceled
3408 * before umount can proceed, this is safe.
3409 */
3410 spin_lock(&cifs_sb->tlink_tree_lock);
3411 node = rb_first(root);
3412 while (node != NULL) {
3413 tmp = node;
3414 node = rb_next(tmp);
3415 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3416
3417 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3418 atomic_read(&tlink->tl_count) != 0 ||
3419 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3420 continue;
3421
3422 cifs_get_tlink(tlink);
3423 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3424 rb_erase(tmp, root);
3425
3426 spin_unlock(&cifs_sb->tlink_tree_lock);
3427 cifs_put_tlink(tlink);
3428 spin_lock(&cifs_sb->tlink_tree_lock);
3429 }
3430 spin_unlock(&cifs_sb->tlink_tree_lock);
3431
3432 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3433 TLINK_IDLE_EXPIRE);
3434 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree