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Merge branch 'for-linus' of git://git.infradead.org/ubi-2.6
[deliverable/linux.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <net/ipv6.h>
41 #include "cifspdu.h"
42 #include "cifsglob.h"
43 #include "cifsproto.h"
44 #include "cifs_unicode.h"
45 #include "cifs_debug.h"
46 #include "cifs_fs_sb.h"
47 #include "ntlmssp.h"
48 #include "nterr.h"
49 #include "rfc1002pdu.h"
50 #include "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 mempool_t *cifs_req_poolp;
59
60 struct smb_vol {
61 char *username;
62 char *password;
63 char *domainname;
64 char *UNC;
65 char *UNCip;
66 char *iocharset; /* local code page for mapping to and from Unicode */
67 char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
68 char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
69 uid_t cred_uid;
70 uid_t linux_uid;
71 gid_t linux_gid;
72 mode_t file_mode;
73 mode_t dir_mode;
74 unsigned secFlg;
75 bool retry:1;
76 bool intr:1;
77 bool setuids:1;
78 bool override_uid:1;
79 bool override_gid:1;
80 bool dynperm:1;
81 bool noperm:1;
82 bool no_psx_acl:1; /* set if posix acl support should be disabled */
83 bool cifs_acl:1;
84 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
85 bool server_ino:1; /* use inode numbers from server ie UniqueId */
86 bool direct_io:1;
87 bool strict_io:1; /* strict cache behavior */
88 bool remap:1; /* set to remap seven reserved chars in filenames */
89 bool posix_paths:1; /* unset to not ask for posix pathnames. */
90 bool no_linux_ext:1;
91 bool sfu_emul:1;
92 bool nullauth:1; /* attempt to authenticate with null user */
93 bool nocase:1; /* request case insensitive filenames */
94 bool nobrl:1; /* disable sending byte range locks to srv */
95 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
96 bool seal:1; /* request transport encryption on share */
97 bool nodfs:1; /* Do not request DFS, even if available */
98 bool local_lease:1; /* check leases only on local system, not remote */
99 bool noblocksnd:1;
100 bool noautotune:1;
101 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
102 bool fsc:1; /* enable fscache */
103 bool mfsymlinks:1; /* use Minshall+French Symlinks */
104 bool multiuser:1;
105 unsigned int rsize;
106 unsigned int wsize;
107 bool sockopt_tcp_nodelay:1;
108 unsigned short int port;
109 unsigned long actimeo; /* attribute cache timeout (jiffies) */
110 char *prepath;
111 struct sockaddr_storage srcaddr; /* allow binding to a local IP */
112 struct nls_table *local_nls;
113 };
114
115 /* FIXME: should these be tunable? */
116 #define TLINK_ERROR_EXPIRE (1 * HZ)
117 #define TLINK_IDLE_EXPIRE (600 * HZ)
118
119 static int ip_connect(struct TCP_Server_Info *server);
120 static int generic_ip_connect(struct TCP_Server_Info *server);
121 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
122 static void cifs_prune_tlinks(struct work_struct *work);
123
124 /*
125 * cifs tcp session reconnection
126 *
127 * mark tcp session as reconnecting so temporarily locked
128 * mark all smb sessions as reconnecting for tcp session
129 * reconnect tcp session
130 * wake up waiters on reconnection? - (not needed currently)
131 */
132 static int
133 cifs_reconnect(struct TCP_Server_Info *server)
134 {
135 int rc = 0;
136 struct list_head *tmp, *tmp2;
137 struct cifsSesInfo *ses;
138 struct cifsTconInfo *tcon;
139 struct mid_q_entry *mid_entry;
140
141 spin_lock(&GlobalMid_Lock);
142 if (server->tcpStatus == CifsExiting) {
143 /* the demux thread will exit normally
144 next time through the loop */
145 spin_unlock(&GlobalMid_Lock);
146 return rc;
147 } else
148 server->tcpStatus = CifsNeedReconnect;
149 spin_unlock(&GlobalMid_Lock);
150 server->maxBuf = 0;
151
152 cFYI(1, "Reconnecting tcp session");
153
154 /* before reconnecting the tcp session, mark the smb session (uid)
155 and the tid bad so they are not used until reconnected */
156 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
157 spin_lock(&cifs_tcp_ses_lock);
158 list_for_each(tmp, &server->smb_ses_list) {
159 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
160 ses->need_reconnect = true;
161 ses->ipc_tid = 0;
162 list_for_each(tmp2, &ses->tcon_list) {
163 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
164 tcon->need_reconnect = true;
165 }
166 }
167 spin_unlock(&cifs_tcp_ses_lock);
168
169 /* do not want to be sending data on a socket we are freeing */
170 cFYI(1, "%s: tearing down socket", __func__);
171 mutex_lock(&server->srv_mutex);
172 if (server->ssocket) {
173 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
174 server->ssocket->flags);
175 kernel_sock_shutdown(server->ssocket, SHUT_WR);
176 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
177 server->ssocket->state,
178 server->ssocket->flags);
179 sock_release(server->ssocket);
180 server->ssocket = NULL;
181 }
182 server->sequence_number = 0;
183 server->session_estab = false;
184 kfree(server->session_key.response);
185 server->session_key.response = NULL;
186 server->session_key.len = 0;
187 server->lstrp = jiffies;
188 mutex_unlock(&server->srv_mutex);
189
190 /* mark submitted MIDs for retry and issue callback */
191 cFYI(1, "%s: issuing mid callbacks", __func__);
192 spin_lock(&GlobalMid_Lock);
193 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
194 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
195 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
196 mid_entry->midState = MID_RETRY_NEEDED;
197 list_del_init(&mid_entry->qhead);
198 mid_entry->callback(mid_entry);
199 }
200 spin_unlock(&GlobalMid_Lock);
201
202 while ((server->tcpStatus != CifsExiting) &&
203 (server->tcpStatus != CifsGood)) {
204 try_to_freeze();
205
206 /* we should try only the port we connected to before */
207 rc = generic_ip_connect(server);
208 if (rc) {
209 cFYI(1, "reconnect error %d", rc);
210 msleep(3000);
211 } else {
212 atomic_inc(&tcpSesReconnectCount);
213 spin_lock(&GlobalMid_Lock);
214 if (server->tcpStatus != CifsExiting)
215 server->tcpStatus = CifsGood;
216 spin_unlock(&GlobalMid_Lock);
217 }
218 }
219
220 return rc;
221 }
222
223 /*
224 return codes:
225 0 not a transact2, or all data present
226 >0 transact2 with that much data missing
227 -EINVAL = invalid transact2
228
229 */
230 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
231 {
232 struct smb_t2_rsp *pSMBt;
233 int remaining;
234 __u16 total_data_size, data_in_this_rsp;
235
236 if (pSMB->Command != SMB_COM_TRANSACTION2)
237 return 0;
238
239 /* check for plausible wct, bcc and t2 data and parm sizes */
240 /* check for parm and data offset going beyond end of smb */
241 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
242 cFYI(1, "invalid transact2 word count");
243 return -EINVAL;
244 }
245
246 pSMBt = (struct smb_t2_rsp *)pSMB;
247
248 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
249 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
250
251 remaining = total_data_size - data_in_this_rsp;
252
253 if (remaining == 0)
254 return 0;
255 else if (remaining < 0) {
256 cFYI(1, "total data %d smaller than data in frame %d",
257 total_data_size, data_in_this_rsp);
258 return -EINVAL;
259 } else {
260 cFYI(1, "missing %d bytes from transact2, check next response",
261 remaining);
262 if (total_data_size > maxBufSize) {
263 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
264 total_data_size, maxBufSize);
265 return -EINVAL;
266 }
267 return remaining;
268 }
269 }
270
271 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
272 {
273 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
274 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
275 char *data_area_of_target;
276 char *data_area_of_buf2;
277 int remaining;
278 __u16 byte_count, total_data_size, total_in_buf, total_in_buf2;
279
280 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
281
282 if (total_data_size !=
283 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
284 cFYI(1, "total data size of primary and secondary t2 differ");
285
286 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
287
288 remaining = total_data_size - total_in_buf;
289
290 if (remaining < 0)
291 return -EINVAL;
292
293 if (remaining == 0) /* nothing to do, ignore */
294 return 0;
295
296 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
297 if (remaining < total_in_buf2) {
298 cFYI(1, "transact2 2nd response contains too much data");
299 }
300
301 /* find end of first SMB data area */
302 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
303 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
304 /* validate target area */
305
306 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
307 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
308
309 data_area_of_target += total_in_buf;
310
311 /* copy second buffer into end of first buffer */
312 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
313 total_in_buf += total_in_buf2;
314 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
315 byte_count = get_bcc_le(pTargetSMB);
316 byte_count += total_in_buf2;
317 put_bcc_le(byte_count, pTargetSMB);
318
319 byte_count = pTargetSMB->smb_buf_length;
320 byte_count += total_in_buf2;
321
322 /* BB also add check that we are not beyond maximum buffer size */
323
324 pTargetSMB->smb_buf_length = byte_count;
325
326 if (remaining == total_in_buf2) {
327 cFYI(1, "found the last secondary response");
328 return 0; /* we are done */
329 } else /* more responses to go */
330 return 1;
331 }
332
333 static void
334 cifs_echo_request(struct work_struct *work)
335 {
336 int rc;
337 struct TCP_Server_Info *server = container_of(work,
338 struct TCP_Server_Info, echo.work);
339
340 /* no need to ping if we got a response recently */
341 if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
342 goto requeue_echo;
343
344 rc = CIFSSMBEcho(server);
345 if (rc)
346 cFYI(1, "Unable to send echo request to server: %s",
347 server->hostname);
348
349 requeue_echo:
350 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
351 }
352
353 static int
354 cifs_demultiplex_thread(struct TCP_Server_Info *server)
355 {
356 int length;
357 unsigned int pdu_length, total_read;
358 struct smb_hdr *smb_buffer = NULL;
359 struct smb_hdr *bigbuf = NULL;
360 struct smb_hdr *smallbuf = NULL;
361 struct msghdr smb_msg;
362 struct kvec iov;
363 struct socket *csocket = server->ssocket;
364 struct list_head *tmp, *tmp2;
365 struct task_struct *task_to_wake = NULL;
366 struct mid_q_entry *mid_entry;
367 char temp;
368 bool isLargeBuf = false;
369 bool isMultiRsp;
370 int reconnect;
371
372 current->flags |= PF_MEMALLOC;
373 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
374
375 length = atomic_inc_return(&tcpSesAllocCount);
376 if (length > 1)
377 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
378 GFP_KERNEL);
379
380 set_freezable();
381 while (server->tcpStatus != CifsExiting) {
382 if (try_to_freeze())
383 continue;
384 if (bigbuf == NULL) {
385 bigbuf = cifs_buf_get();
386 if (!bigbuf) {
387 cERROR(1, "No memory for large SMB response");
388 msleep(3000);
389 /* retry will check if exiting */
390 continue;
391 }
392 } else if (isLargeBuf) {
393 /* we are reusing a dirty large buf, clear its start */
394 memset(bigbuf, 0, sizeof(struct smb_hdr));
395 }
396
397 if (smallbuf == NULL) {
398 smallbuf = cifs_small_buf_get();
399 if (!smallbuf) {
400 cERROR(1, "No memory for SMB response");
401 msleep(1000);
402 /* retry will check if exiting */
403 continue;
404 }
405 /* beginning of smb buffer is cleared in our buf_get */
406 } else /* if existing small buf clear beginning */
407 memset(smallbuf, 0, sizeof(struct smb_hdr));
408
409 isLargeBuf = false;
410 isMultiRsp = false;
411 smb_buffer = smallbuf;
412 iov.iov_base = smb_buffer;
413 iov.iov_len = 4;
414 smb_msg.msg_control = NULL;
415 smb_msg.msg_controllen = 0;
416 pdu_length = 4; /* enough to get RFC1001 header */
417
418 incomplete_rcv:
419 if (echo_retries > 0 &&
420 time_after(jiffies, server->lstrp +
421 (echo_retries * SMB_ECHO_INTERVAL))) {
422 cERROR(1, "Server %s has not responded in %d seconds. "
423 "Reconnecting...", server->hostname,
424 (echo_retries * SMB_ECHO_INTERVAL / HZ));
425 cifs_reconnect(server);
426 csocket = server->ssocket;
427 wake_up(&server->response_q);
428 continue;
429 }
430
431 length =
432 kernel_recvmsg(csocket, &smb_msg,
433 &iov, 1, pdu_length, 0 /* BB other flags? */);
434
435 if (server->tcpStatus == CifsExiting) {
436 break;
437 } else if (server->tcpStatus == CifsNeedReconnect) {
438 cFYI(1, "Reconnect after server stopped responding");
439 cifs_reconnect(server);
440 cFYI(1, "call to reconnect done");
441 csocket = server->ssocket;
442 continue;
443 } else if (length == -ERESTARTSYS ||
444 length == -EAGAIN ||
445 length == -EINTR) {
446 msleep(1); /* minimum sleep to prevent looping
447 allowing socket to clear and app threads to set
448 tcpStatus CifsNeedReconnect if server hung */
449 if (pdu_length < 4) {
450 iov.iov_base = (4 - pdu_length) +
451 (char *)smb_buffer;
452 iov.iov_len = pdu_length;
453 smb_msg.msg_control = NULL;
454 smb_msg.msg_controllen = 0;
455 goto incomplete_rcv;
456 } else
457 continue;
458 } else if (length <= 0) {
459 cFYI(1, "Reconnect after unexpected peek error %d",
460 length);
461 cifs_reconnect(server);
462 csocket = server->ssocket;
463 wake_up(&server->response_q);
464 continue;
465 } else if (length < pdu_length) {
466 cFYI(1, "requested %d bytes but only got %d bytes",
467 pdu_length, length);
468 pdu_length -= length;
469 msleep(1);
470 goto incomplete_rcv;
471 }
472
473 /* The right amount was read from socket - 4 bytes */
474 /* so we can now interpret the length field */
475
476 /* the first byte big endian of the length field,
477 is actually not part of the length but the type
478 with the most common, zero, as regular data */
479 temp = *((char *) smb_buffer);
480
481 /* Note that FC 1001 length is big endian on the wire,
482 but we convert it here so it is always manipulated
483 as host byte order */
484 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
485 smb_buffer->smb_buf_length = pdu_length;
486
487 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
488
489 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
490 continue;
491 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
492 cFYI(1, "Good RFC 1002 session rsp");
493 continue;
494 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
495 /* we get this from Windows 98 instead of
496 an error on SMB negprot response */
497 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
498 pdu_length);
499 /* give server a second to clean up */
500 msleep(1000);
501 /* always try 445 first on reconnect since we get NACK
502 * on some if we ever connected to port 139 (the NACK
503 * is since we do not begin with RFC1001 session
504 * initialize frame)
505 */
506 cifs_set_port((struct sockaddr *)
507 &server->dstaddr, CIFS_PORT);
508 cifs_reconnect(server);
509 csocket = server->ssocket;
510 wake_up(&server->response_q);
511 continue;
512 } else if (temp != (char) 0) {
513 cERROR(1, "Unknown RFC 1002 frame");
514 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
515 length);
516 cifs_reconnect(server);
517 csocket = server->ssocket;
518 continue;
519 }
520
521 /* else we have an SMB response */
522 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
523 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
524 cERROR(1, "Invalid size SMB length %d pdu_length %d",
525 length, pdu_length+4);
526 cifs_reconnect(server);
527 csocket = server->ssocket;
528 wake_up(&server->response_q);
529 continue;
530 }
531
532 /* else length ok */
533 reconnect = 0;
534
535 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
536 isLargeBuf = true;
537 memcpy(bigbuf, smallbuf, 4);
538 smb_buffer = bigbuf;
539 }
540 length = 0;
541 iov.iov_base = 4 + (char *)smb_buffer;
542 iov.iov_len = pdu_length;
543 for (total_read = 0; total_read < pdu_length;
544 total_read += length) {
545 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
546 pdu_length - total_read, 0);
547 if (server->tcpStatus == CifsExiting) {
548 /* then will exit */
549 reconnect = 2;
550 break;
551 } else if (server->tcpStatus == CifsNeedReconnect) {
552 cifs_reconnect(server);
553 csocket = server->ssocket;
554 /* Reconnect wakes up rspns q */
555 /* Now we will reread sock */
556 reconnect = 1;
557 break;
558 } else if (length == -ERESTARTSYS ||
559 length == -EAGAIN ||
560 length == -EINTR) {
561 msleep(1); /* minimum sleep to prevent looping,
562 allowing socket to clear and app
563 threads to set tcpStatus
564 CifsNeedReconnect if server hung*/
565 length = 0;
566 continue;
567 } else if (length <= 0) {
568 cERROR(1, "Received no data, expecting %d",
569 pdu_length - total_read);
570 cifs_reconnect(server);
571 csocket = server->ssocket;
572 reconnect = 1;
573 break;
574 }
575 }
576 if (reconnect == 2)
577 break;
578 else if (reconnect == 1)
579 continue;
580
581 length += 4; /* account for rfc1002 hdr */
582
583
584 dump_smb(smb_buffer, length);
585 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
586 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
587 continue;
588 }
589
590 mid_entry = NULL;
591 server->lstrp = jiffies;
592
593 spin_lock(&GlobalMid_Lock);
594 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
595 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
596
597 if ((mid_entry->mid == smb_buffer->Mid) &&
598 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
599 (mid_entry->command == smb_buffer->Command)) {
600 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
601 /* We have a multipart transact2 resp */
602 isMultiRsp = true;
603 if (mid_entry->resp_buf) {
604 /* merge response - fix up 1st*/
605 if (coalesce_t2(smb_buffer,
606 mid_entry->resp_buf)) {
607 mid_entry->multiRsp =
608 true;
609 break;
610 } else {
611 /* all parts received */
612 mid_entry->multiEnd =
613 true;
614 goto multi_t2_fnd;
615 }
616 } else {
617 if (!isLargeBuf) {
618 cERROR(1, "1st trans2 resp needs bigbuf");
619 /* BB maybe we can fix this up, switch
620 to already allocated large buffer? */
621 } else {
622 /* Have first buffer */
623 mid_entry->resp_buf =
624 smb_buffer;
625 mid_entry->largeBuf =
626 true;
627 bigbuf = NULL;
628 }
629 }
630 break;
631 }
632 mid_entry->resp_buf = smb_buffer;
633 mid_entry->largeBuf = isLargeBuf;
634 multi_t2_fnd:
635 mid_entry->midState = MID_RESPONSE_RECEIVED;
636 list_del_init(&mid_entry->qhead);
637 mid_entry->callback(mid_entry);
638 #ifdef CONFIG_CIFS_STATS2
639 mid_entry->when_received = jiffies;
640 #endif
641 break;
642 }
643 mid_entry = NULL;
644 }
645 spin_unlock(&GlobalMid_Lock);
646
647 if (mid_entry != NULL) {
648 /* Was previous buf put in mpx struct for multi-rsp? */
649 if (!isMultiRsp) {
650 /* smb buffer will be freed by user thread */
651 if (isLargeBuf)
652 bigbuf = NULL;
653 else
654 smallbuf = NULL;
655 }
656 } else if (!is_valid_oplock_break(smb_buffer, server) &&
657 !isMultiRsp) {
658 cERROR(1, "No task to wake, unknown frame received! "
659 "NumMids %d", atomic_read(&midCount));
660 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
661 sizeof(struct smb_hdr));
662 #ifdef CONFIG_CIFS_DEBUG2
663 cifs_dump_detail(smb_buffer);
664 cifs_dump_mids(server);
665 #endif /* CIFS_DEBUG2 */
666
667 }
668 } /* end while !EXITING */
669
670 /* take it off the list, if it's not already */
671 spin_lock(&cifs_tcp_ses_lock);
672 list_del_init(&server->tcp_ses_list);
673 spin_unlock(&cifs_tcp_ses_lock);
674
675 spin_lock(&GlobalMid_Lock);
676 server->tcpStatus = CifsExiting;
677 spin_unlock(&GlobalMid_Lock);
678 wake_up_all(&server->response_q);
679
680 /* check if we have blocked requests that need to free */
681 /* Note that cifs_max_pending is normally 50, but
682 can be set at module install time to as little as two */
683 spin_lock(&GlobalMid_Lock);
684 if (atomic_read(&server->inFlight) >= cifs_max_pending)
685 atomic_set(&server->inFlight, cifs_max_pending - 1);
686 /* We do not want to set the max_pending too low or we
687 could end up with the counter going negative */
688 spin_unlock(&GlobalMid_Lock);
689 /* Although there should not be any requests blocked on
690 this queue it can not hurt to be paranoid and try to wake up requests
691 that may haven been blocked when more than 50 at time were on the wire
692 to the same server - they now will see the session is in exit state
693 and get out of SendReceive. */
694 wake_up_all(&server->request_q);
695 /* give those requests time to exit */
696 msleep(125);
697
698 if (server->ssocket) {
699 sock_release(csocket);
700 server->ssocket = NULL;
701 }
702 /* buffer usuallly freed in free_mid - need to free it here on exit */
703 cifs_buf_release(bigbuf);
704 if (smallbuf) /* no sense logging a debug message if NULL */
705 cifs_small_buf_release(smallbuf);
706
707 if (!list_empty(&server->pending_mid_q)) {
708 spin_lock(&GlobalMid_Lock);
709 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
710 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
711 cFYI(1, "Clearing Mid 0x%x - issuing callback",
712 mid_entry->mid);
713 list_del_init(&mid_entry->qhead);
714 mid_entry->callback(mid_entry);
715 }
716 spin_unlock(&GlobalMid_Lock);
717 /* 1/8th of sec is more than enough time for them to exit */
718 msleep(125);
719 }
720
721 if (!list_empty(&server->pending_mid_q)) {
722 /* mpx threads have not exited yet give them
723 at least the smb send timeout time for long ops */
724 /* due to delays on oplock break requests, we need
725 to wait at least 45 seconds before giving up
726 on a request getting a response and going ahead
727 and killing cifsd */
728 cFYI(1, "Wait for exit from demultiplex thread");
729 msleep(46000);
730 /* if threads still have not exited they are probably never
731 coming home not much else we can do but free the memory */
732 }
733
734 kfree(server->hostname);
735 task_to_wake = xchg(&server->tsk, NULL);
736 kfree(server);
737
738 length = atomic_dec_return(&tcpSesAllocCount);
739 if (length > 0)
740 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
741 GFP_KERNEL);
742
743 /* if server->tsk was NULL then wait for a signal before exiting */
744 if (!task_to_wake) {
745 set_current_state(TASK_INTERRUPTIBLE);
746 while (!signal_pending(current)) {
747 schedule();
748 set_current_state(TASK_INTERRUPTIBLE);
749 }
750 set_current_state(TASK_RUNNING);
751 }
752
753 module_put_and_exit(0);
754 }
755
756 /* extract the host portion of the UNC string */
757 static char *
758 extract_hostname(const char *unc)
759 {
760 const char *src;
761 char *dst, *delim;
762 unsigned int len;
763
764 /* skip double chars at beginning of string */
765 /* BB: check validity of these bytes? */
766 src = unc + 2;
767
768 /* delimiter between hostname and sharename is always '\\' now */
769 delim = strchr(src, '\\');
770 if (!delim)
771 return ERR_PTR(-EINVAL);
772
773 len = delim - src;
774 dst = kmalloc((len + 1), GFP_KERNEL);
775 if (dst == NULL)
776 return ERR_PTR(-ENOMEM);
777
778 memcpy(dst, src, len);
779 dst[len] = '\0';
780
781 return dst;
782 }
783
784 static int
785 cifs_parse_mount_options(char *options, const char *devname,
786 struct smb_vol *vol)
787 {
788 char *value;
789 char *data;
790 unsigned int temp_len, i, j;
791 char separator[2];
792 short int override_uid = -1;
793 short int override_gid = -1;
794 bool uid_specified = false;
795 bool gid_specified = false;
796 char *nodename = utsname()->nodename;
797
798 separator[0] = ',';
799 separator[1] = 0;
800
801 /*
802 * does not have to be perfect mapping since field is
803 * informational, only used for servers that do not support
804 * port 445 and it can be overridden at mount time
805 */
806 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
807 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
808 vol->source_rfc1001_name[i] = toupper(nodename[i]);
809
810 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
811 /* null target name indicates to use *SMBSERVR default called name
812 if we end up sending RFC1001 session initialize */
813 vol->target_rfc1001_name[0] = 0;
814 vol->cred_uid = current_uid();
815 vol->linux_uid = current_uid();
816 vol->linux_gid = current_gid();
817
818 /* default to only allowing write access to owner of the mount */
819 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
820
821 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
822 /* default is always to request posix paths. */
823 vol->posix_paths = 1;
824 /* default to using server inode numbers where available */
825 vol->server_ino = 1;
826
827 vol->actimeo = CIFS_DEF_ACTIMEO;
828
829 if (!options)
830 return 1;
831
832 if (strncmp(options, "sep=", 4) == 0) {
833 if (options[4] != 0) {
834 separator[0] = options[4];
835 options += 5;
836 } else {
837 cFYI(1, "Null separator not allowed");
838 }
839 }
840
841 while ((data = strsep(&options, separator)) != NULL) {
842 if (!*data)
843 continue;
844 if ((value = strchr(data, '=')) != NULL)
845 *value++ = '\0';
846
847 /* Have to parse this before we parse for "user" */
848 if (strnicmp(data, "user_xattr", 10) == 0) {
849 vol->no_xattr = 0;
850 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
851 vol->no_xattr = 1;
852 } else if (strnicmp(data, "user", 4) == 0) {
853 if (!value) {
854 printk(KERN_WARNING
855 "CIFS: invalid or missing username\n");
856 return 1; /* needs_arg; */
857 } else if (!*value) {
858 /* null user, ie anonymous, authentication */
859 vol->nullauth = 1;
860 }
861 if (strnlen(value, 200) < 200) {
862 vol->username = value;
863 } else {
864 printk(KERN_WARNING "CIFS: username too long\n");
865 return 1;
866 }
867 } else if (strnicmp(data, "pass", 4) == 0) {
868 if (!value) {
869 vol->password = NULL;
870 continue;
871 } else if (value[0] == 0) {
872 /* check if string begins with double comma
873 since that would mean the password really
874 does start with a comma, and would not
875 indicate an empty string */
876 if (value[1] != separator[0]) {
877 vol->password = NULL;
878 continue;
879 }
880 }
881 temp_len = strlen(value);
882 /* removed password length check, NTLM passwords
883 can be arbitrarily long */
884
885 /* if comma in password, the string will be
886 prematurely null terminated. Commas in password are
887 specified across the cifs mount interface by a double
888 comma ie ,, and a comma used as in other cases ie ','
889 as a parameter delimiter/separator is single and due
890 to the strsep above is temporarily zeroed. */
891
892 /* NB: password legally can have multiple commas and
893 the only illegal character in a password is null */
894
895 if ((value[temp_len] == 0) &&
896 (value[temp_len+1] == separator[0])) {
897 /* reinsert comma */
898 value[temp_len] = separator[0];
899 temp_len += 2; /* move after second comma */
900 while (value[temp_len] != 0) {
901 if (value[temp_len] == separator[0]) {
902 if (value[temp_len+1] ==
903 separator[0]) {
904 /* skip second comma */
905 temp_len++;
906 } else {
907 /* single comma indicating start
908 of next parm */
909 break;
910 }
911 }
912 temp_len++;
913 }
914 if (value[temp_len] == 0) {
915 options = NULL;
916 } else {
917 value[temp_len] = 0;
918 /* point option to start of next parm */
919 options = value + temp_len + 1;
920 }
921 /* go from value to value + temp_len condensing
922 double commas to singles. Note that this ends up
923 allocating a few bytes too many, which is ok */
924 vol->password = kzalloc(temp_len, GFP_KERNEL);
925 if (vol->password == NULL) {
926 printk(KERN_WARNING "CIFS: no memory "
927 "for password\n");
928 return 1;
929 }
930 for (i = 0, j = 0; i < temp_len; i++, j++) {
931 vol->password[j] = value[i];
932 if (value[i] == separator[0]
933 && value[i+1] == separator[0]) {
934 /* skip second comma */
935 i++;
936 }
937 }
938 vol->password[j] = 0;
939 } else {
940 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
941 if (vol->password == NULL) {
942 printk(KERN_WARNING "CIFS: no memory "
943 "for password\n");
944 return 1;
945 }
946 strcpy(vol->password, value);
947 }
948 } else if (!strnicmp(data, "ip", 2) ||
949 !strnicmp(data, "addr", 4)) {
950 if (!value || !*value) {
951 vol->UNCip = NULL;
952 } else if (strnlen(value, INET6_ADDRSTRLEN) <
953 INET6_ADDRSTRLEN) {
954 vol->UNCip = value;
955 } else {
956 printk(KERN_WARNING "CIFS: ip address "
957 "too long\n");
958 return 1;
959 }
960 } else if (strnicmp(data, "sec", 3) == 0) {
961 if (!value || !*value) {
962 cERROR(1, "no security value specified");
963 continue;
964 } else if (strnicmp(value, "krb5i", 5) == 0) {
965 vol->secFlg |= CIFSSEC_MAY_KRB5 |
966 CIFSSEC_MUST_SIGN;
967 } else if (strnicmp(value, "krb5p", 5) == 0) {
968 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
969 CIFSSEC_MAY_KRB5; */
970 cERROR(1, "Krb5 cifs privacy not supported");
971 return 1;
972 } else if (strnicmp(value, "krb5", 4) == 0) {
973 vol->secFlg |= CIFSSEC_MAY_KRB5;
974 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
975 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
976 CIFSSEC_MUST_SIGN;
977 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
978 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
979 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
980 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
981 CIFSSEC_MUST_SIGN;
982 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
983 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
984 } else if (strnicmp(value, "ntlmi", 5) == 0) {
985 vol->secFlg |= CIFSSEC_MAY_NTLM |
986 CIFSSEC_MUST_SIGN;
987 } else if (strnicmp(value, "ntlm", 4) == 0) {
988 /* ntlm is default so can be turned off too */
989 vol->secFlg |= CIFSSEC_MAY_NTLM;
990 } else if (strnicmp(value, "nontlm", 6) == 0) {
991 /* BB is there a better way to do this? */
992 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
993 #ifdef CONFIG_CIFS_WEAK_PW_HASH
994 } else if (strnicmp(value, "lanman", 6) == 0) {
995 vol->secFlg |= CIFSSEC_MAY_LANMAN;
996 #endif
997 } else if (strnicmp(value, "none", 4) == 0) {
998 vol->nullauth = 1;
999 } else {
1000 cERROR(1, "bad security option: %s", value);
1001 return 1;
1002 }
1003 } else if ((strnicmp(data, "unc", 3) == 0)
1004 || (strnicmp(data, "target", 6) == 0)
1005 || (strnicmp(data, "path", 4) == 0)) {
1006 if (!value || !*value) {
1007 printk(KERN_WARNING "CIFS: invalid path to "
1008 "network resource\n");
1009 return 1; /* needs_arg; */
1010 }
1011 if ((temp_len = strnlen(value, 300)) < 300) {
1012 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1013 if (vol->UNC == NULL)
1014 return 1;
1015 strcpy(vol->UNC, value);
1016 if (strncmp(vol->UNC, "//", 2) == 0) {
1017 vol->UNC[0] = '\\';
1018 vol->UNC[1] = '\\';
1019 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1020 printk(KERN_WARNING
1021 "CIFS: UNC Path does not begin "
1022 "with // or \\\\ \n");
1023 return 1;
1024 }
1025 } else {
1026 printk(KERN_WARNING "CIFS: UNC name too long\n");
1027 return 1;
1028 }
1029 } else if ((strnicmp(data, "domain", 3) == 0)
1030 || (strnicmp(data, "workgroup", 5) == 0)) {
1031 if (!value || !*value) {
1032 printk(KERN_WARNING "CIFS: invalid domain name\n");
1033 return 1; /* needs_arg; */
1034 }
1035 /* BB are there cases in which a comma can be valid in
1036 a domain name and need special handling? */
1037 if (strnlen(value, 256) < 256) {
1038 vol->domainname = value;
1039 cFYI(1, "Domain name set");
1040 } else {
1041 printk(KERN_WARNING "CIFS: domain name too "
1042 "long\n");
1043 return 1;
1044 }
1045 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1046 vol->srcaddr.ss_family = AF_UNSPEC;
1047
1048 if (!value || !*value) {
1049 printk(KERN_WARNING "CIFS: srcaddr value"
1050 " not specified.\n");
1051 return 1; /* needs_arg; */
1052 }
1053 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1054 value, strlen(value));
1055 if (i == 0) {
1056 printk(KERN_WARNING "CIFS: Could not parse"
1057 " srcaddr: %s\n",
1058 value);
1059 return 1;
1060 }
1061 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1062 if (!value || !*value) {
1063 printk(KERN_WARNING
1064 "CIFS: invalid path prefix\n");
1065 return 1; /* needs_argument */
1066 }
1067 if ((temp_len = strnlen(value, 1024)) < 1024) {
1068 if (value[0] != '/')
1069 temp_len++; /* missing leading slash */
1070 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1071 if (vol->prepath == NULL)
1072 return 1;
1073 if (value[0] != '/') {
1074 vol->prepath[0] = '/';
1075 strcpy(vol->prepath+1, value);
1076 } else
1077 strcpy(vol->prepath, value);
1078 cFYI(1, "prefix path %s", vol->prepath);
1079 } else {
1080 printk(KERN_WARNING "CIFS: prefix too long\n");
1081 return 1;
1082 }
1083 } else if (strnicmp(data, "iocharset", 9) == 0) {
1084 if (!value || !*value) {
1085 printk(KERN_WARNING "CIFS: invalid iocharset "
1086 "specified\n");
1087 return 1; /* needs_arg; */
1088 }
1089 if (strnlen(value, 65) < 65) {
1090 if (strnicmp(value, "default", 7))
1091 vol->iocharset = value;
1092 /* if iocharset not set then load_nls_default
1093 is used by caller */
1094 cFYI(1, "iocharset set to %s", value);
1095 } else {
1096 printk(KERN_WARNING "CIFS: iocharset name "
1097 "too long.\n");
1098 return 1;
1099 }
1100 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1101 vol->linux_uid = simple_strtoul(value, &value, 0);
1102 uid_specified = true;
1103 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1104 vol->cred_uid = simple_strtoul(value, &value, 0);
1105 } else if (!strnicmp(data, "forceuid", 8)) {
1106 override_uid = 1;
1107 } else if (!strnicmp(data, "noforceuid", 10)) {
1108 override_uid = 0;
1109 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1110 vol->linux_gid = simple_strtoul(value, &value, 0);
1111 gid_specified = true;
1112 } else if (!strnicmp(data, "forcegid", 8)) {
1113 override_gid = 1;
1114 } else if (!strnicmp(data, "noforcegid", 10)) {
1115 override_gid = 0;
1116 } else if (strnicmp(data, "file_mode", 4) == 0) {
1117 if (value && *value) {
1118 vol->file_mode =
1119 simple_strtoul(value, &value, 0);
1120 }
1121 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1122 if (value && *value) {
1123 vol->dir_mode =
1124 simple_strtoul(value, &value, 0);
1125 }
1126 } else if (strnicmp(data, "dirmode", 4) == 0) {
1127 if (value && *value) {
1128 vol->dir_mode =
1129 simple_strtoul(value, &value, 0);
1130 }
1131 } else if (strnicmp(data, "port", 4) == 0) {
1132 if (value && *value) {
1133 vol->port =
1134 simple_strtoul(value, &value, 0);
1135 }
1136 } else if (strnicmp(data, "rsize", 5) == 0) {
1137 if (value && *value) {
1138 vol->rsize =
1139 simple_strtoul(value, &value, 0);
1140 }
1141 } else if (strnicmp(data, "wsize", 5) == 0) {
1142 if (value && *value) {
1143 vol->wsize =
1144 simple_strtoul(value, &value, 0);
1145 }
1146 } else if (strnicmp(data, "sockopt", 5) == 0) {
1147 if (!value || !*value) {
1148 cERROR(1, "no socket option specified");
1149 continue;
1150 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1151 vol->sockopt_tcp_nodelay = 1;
1152 }
1153 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1154 if (!value || !*value || (*value == ' ')) {
1155 cFYI(1, "invalid (empty) netbiosname");
1156 } else {
1157 memset(vol->source_rfc1001_name, 0x20,
1158 RFC1001_NAME_LEN);
1159 /*
1160 * FIXME: are there cases in which a comma can
1161 * be valid in workstation netbios name (and
1162 * need special handling)?
1163 */
1164 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1165 /* don't ucase netbiosname for user */
1166 if (value[i] == 0)
1167 break;
1168 vol->source_rfc1001_name[i] = value[i];
1169 }
1170 /* The string has 16th byte zero still from
1171 set at top of the function */
1172 if (i == RFC1001_NAME_LEN && value[i] != 0)
1173 printk(KERN_WARNING "CIFS: netbiosname"
1174 " longer than 15 truncated.\n");
1175 }
1176 } else if (strnicmp(data, "servern", 7) == 0) {
1177 /* servernetbiosname specified override *SMBSERVER */
1178 if (!value || !*value || (*value == ' ')) {
1179 cFYI(1, "empty server netbiosname specified");
1180 } else {
1181 /* last byte, type, is 0x20 for servr type */
1182 memset(vol->target_rfc1001_name, 0x20,
1183 RFC1001_NAME_LEN_WITH_NULL);
1184
1185 for (i = 0; i < 15; i++) {
1186 /* BB are there cases in which a comma can be
1187 valid in this workstation netbios name
1188 (and need special handling)? */
1189
1190 /* user or mount helper must uppercase
1191 the netbiosname */
1192 if (value[i] == 0)
1193 break;
1194 else
1195 vol->target_rfc1001_name[i] =
1196 value[i];
1197 }
1198 /* The string has 16th byte zero still from
1199 set at top of the function */
1200 if (i == RFC1001_NAME_LEN && value[i] != 0)
1201 printk(KERN_WARNING "CIFS: server net"
1202 "biosname longer than 15 truncated.\n");
1203 }
1204 } else if (strnicmp(data, "actimeo", 7) == 0) {
1205 if (value && *value) {
1206 vol->actimeo = HZ * simple_strtoul(value,
1207 &value, 0);
1208 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1209 cERROR(1, "CIFS: attribute cache"
1210 "timeout too large");
1211 return 1;
1212 }
1213 }
1214 } else if (strnicmp(data, "credentials", 4) == 0) {
1215 /* ignore */
1216 } else if (strnicmp(data, "version", 3) == 0) {
1217 /* ignore */
1218 } else if (strnicmp(data, "guest", 5) == 0) {
1219 /* ignore */
1220 } else if (strnicmp(data, "rw", 2) == 0) {
1221 /* ignore */
1222 } else if (strnicmp(data, "ro", 2) == 0) {
1223 /* ignore */
1224 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1225 vol->noblocksnd = 1;
1226 } else if (strnicmp(data, "noautotune", 10) == 0) {
1227 vol->noautotune = 1;
1228 } else if ((strnicmp(data, "suid", 4) == 0) ||
1229 (strnicmp(data, "nosuid", 6) == 0) ||
1230 (strnicmp(data, "exec", 4) == 0) ||
1231 (strnicmp(data, "noexec", 6) == 0) ||
1232 (strnicmp(data, "nodev", 5) == 0) ||
1233 (strnicmp(data, "noauto", 6) == 0) ||
1234 (strnicmp(data, "dev", 3) == 0)) {
1235 /* The mount tool or mount.cifs helper (if present)
1236 uses these opts to set flags, and the flags are read
1237 by the kernel vfs layer before we get here (ie
1238 before read super) so there is no point trying to
1239 parse these options again and set anything and it
1240 is ok to just ignore them */
1241 continue;
1242 } else if (strnicmp(data, "hard", 4) == 0) {
1243 vol->retry = 1;
1244 } else if (strnicmp(data, "soft", 4) == 0) {
1245 vol->retry = 0;
1246 } else if (strnicmp(data, "perm", 4) == 0) {
1247 vol->noperm = 0;
1248 } else if (strnicmp(data, "noperm", 6) == 0) {
1249 vol->noperm = 1;
1250 } else if (strnicmp(data, "mapchars", 8) == 0) {
1251 vol->remap = 1;
1252 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1253 vol->remap = 0;
1254 } else if (strnicmp(data, "sfu", 3) == 0) {
1255 vol->sfu_emul = 1;
1256 } else if (strnicmp(data, "nosfu", 5) == 0) {
1257 vol->sfu_emul = 0;
1258 } else if (strnicmp(data, "nodfs", 5) == 0) {
1259 vol->nodfs = 1;
1260 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1261 vol->posix_paths = 1;
1262 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1263 vol->posix_paths = 0;
1264 } else if (strnicmp(data, "nounix", 6) == 0) {
1265 vol->no_linux_ext = 1;
1266 } else if (strnicmp(data, "nolinux", 7) == 0) {
1267 vol->no_linux_ext = 1;
1268 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1269 (strnicmp(data, "ignorecase", 10) == 0)) {
1270 vol->nocase = 1;
1271 } else if (strnicmp(data, "mand", 4) == 0) {
1272 /* ignore */
1273 } else if (strnicmp(data, "nomand", 6) == 0) {
1274 /* ignore */
1275 } else if (strnicmp(data, "_netdev", 7) == 0) {
1276 /* ignore */
1277 } else if (strnicmp(data, "brl", 3) == 0) {
1278 vol->nobrl = 0;
1279 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1280 (strnicmp(data, "nolock", 6) == 0)) {
1281 vol->nobrl = 1;
1282 /* turn off mandatory locking in mode
1283 if remote locking is turned off since the
1284 local vfs will do advisory */
1285 if (vol->file_mode ==
1286 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1287 vol->file_mode = S_IALLUGO;
1288 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1289 /* will take the shorter form "forcemand" as well */
1290 /* This mount option will force use of mandatory
1291 (DOS/Windows style) byte range locks, instead of
1292 using posix advisory byte range locks, even if the
1293 Unix extensions are available and posix locks would
1294 be supported otherwise. If Unix extensions are not
1295 negotiated this has no effect since mandatory locks
1296 would be used (mandatory locks is all that those
1297 those servers support) */
1298 vol->mand_lock = 1;
1299 } else if (strnicmp(data, "setuids", 7) == 0) {
1300 vol->setuids = 1;
1301 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1302 vol->setuids = 0;
1303 } else if (strnicmp(data, "dynperm", 7) == 0) {
1304 vol->dynperm = true;
1305 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1306 vol->dynperm = false;
1307 } else if (strnicmp(data, "nohard", 6) == 0) {
1308 vol->retry = 0;
1309 } else if (strnicmp(data, "nosoft", 6) == 0) {
1310 vol->retry = 1;
1311 } else if (strnicmp(data, "nointr", 6) == 0) {
1312 vol->intr = 0;
1313 } else if (strnicmp(data, "intr", 4) == 0) {
1314 vol->intr = 1;
1315 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1316 vol->nostrictsync = 1;
1317 } else if (strnicmp(data, "strictsync", 10) == 0) {
1318 vol->nostrictsync = 0;
1319 } else if (strnicmp(data, "serverino", 7) == 0) {
1320 vol->server_ino = 1;
1321 } else if (strnicmp(data, "noserverino", 9) == 0) {
1322 vol->server_ino = 0;
1323 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1324 vol->cifs_acl = 1;
1325 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1326 vol->cifs_acl = 0;
1327 } else if (strnicmp(data, "acl", 3) == 0) {
1328 vol->no_psx_acl = 0;
1329 } else if (strnicmp(data, "noacl", 5) == 0) {
1330 vol->no_psx_acl = 1;
1331 } else if (strnicmp(data, "locallease", 6) == 0) {
1332 vol->local_lease = 1;
1333 } else if (strnicmp(data, "sign", 4) == 0) {
1334 vol->secFlg |= CIFSSEC_MUST_SIGN;
1335 } else if (strnicmp(data, "seal", 4) == 0) {
1336 /* we do not do the following in secFlags because seal
1337 is a per tree connection (mount) not a per socket
1338 or per-smb connection option in the protocol */
1339 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1340 vol->seal = 1;
1341 } else if (strnicmp(data, "direct", 6) == 0) {
1342 vol->direct_io = 1;
1343 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1344 vol->direct_io = 1;
1345 } else if (strnicmp(data, "strictcache", 11) == 0) {
1346 vol->strict_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 (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1572 continue;
1573
1574 if (!match_address(server, addr,
1575 (struct sockaddr *)&vol->srcaddr))
1576 continue;
1577
1578 if (!match_port(server, addr))
1579 continue;
1580
1581 if (!match_security(server, vol))
1582 continue;
1583
1584 ++server->srv_count;
1585 spin_unlock(&cifs_tcp_ses_lock);
1586 cFYI(1, "Existing tcp session with server found");
1587 return server;
1588 }
1589 spin_unlock(&cifs_tcp_ses_lock);
1590 return NULL;
1591 }
1592
1593 static void
1594 cifs_put_tcp_session(struct TCP_Server_Info *server)
1595 {
1596 struct task_struct *task;
1597
1598 spin_lock(&cifs_tcp_ses_lock);
1599 if (--server->srv_count > 0) {
1600 spin_unlock(&cifs_tcp_ses_lock);
1601 return;
1602 }
1603
1604 put_net(cifs_net_ns(server));
1605
1606 list_del_init(&server->tcp_ses_list);
1607 spin_unlock(&cifs_tcp_ses_lock);
1608
1609 cancel_delayed_work_sync(&server->echo);
1610
1611 spin_lock(&GlobalMid_Lock);
1612 server->tcpStatus = CifsExiting;
1613 spin_unlock(&GlobalMid_Lock);
1614
1615 cifs_crypto_shash_release(server);
1616 cifs_fscache_release_client_cookie(server);
1617
1618 kfree(server->session_key.response);
1619 server->session_key.response = NULL;
1620 server->session_key.len = 0;
1621
1622 task = xchg(&server->tsk, NULL);
1623 if (task)
1624 force_sig(SIGKILL, task);
1625 }
1626
1627 static struct TCP_Server_Info *
1628 cifs_get_tcp_session(struct smb_vol *volume_info)
1629 {
1630 struct TCP_Server_Info *tcp_ses = NULL;
1631 struct sockaddr_storage addr;
1632 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1633 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1634 int rc;
1635
1636 memset(&addr, 0, sizeof(struct sockaddr_storage));
1637
1638 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1639
1640 if (volume_info->UNCip && volume_info->UNC) {
1641 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1642 volume_info->UNCip,
1643 strlen(volume_info->UNCip),
1644 volume_info->port);
1645 if (!rc) {
1646 /* we failed translating address */
1647 rc = -EINVAL;
1648 goto out_err;
1649 }
1650 } else if (volume_info->UNCip) {
1651 /* BB using ip addr as tcp_ses name to connect to the
1652 DFS root below */
1653 cERROR(1, "Connecting to DFS root not implemented yet");
1654 rc = -EINVAL;
1655 goto out_err;
1656 } else /* which tcp_sess DFS root would we conect to */ {
1657 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1658 "unc=//192.168.1.100/public) specified");
1659 rc = -EINVAL;
1660 goto out_err;
1661 }
1662
1663 /* see if we already have a matching tcp_ses */
1664 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1665 if (tcp_ses)
1666 return tcp_ses;
1667
1668 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1669 if (!tcp_ses) {
1670 rc = -ENOMEM;
1671 goto out_err;
1672 }
1673
1674 rc = cifs_crypto_shash_allocate(tcp_ses);
1675 if (rc) {
1676 cERROR(1, "could not setup hash structures rc %d", rc);
1677 goto out_err;
1678 }
1679
1680 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1681 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1682 if (IS_ERR(tcp_ses->hostname)) {
1683 rc = PTR_ERR(tcp_ses->hostname);
1684 goto out_err_crypto_release;
1685 }
1686
1687 tcp_ses->noblocksnd = volume_info->noblocksnd;
1688 tcp_ses->noautotune = volume_info->noautotune;
1689 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1690 atomic_set(&tcp_ses->inFlight, 0);
1691 init_waitqueue_head(&tcp_ses->response_q);
1692 init_waitqueue_head(&tcp_ses->request_q);
1693 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1694 mutex_init(&tcp_ses->srv_mutex);
1695 memcpy(tcp_ses->workstation_RFC1001_name,
1696 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1697 memcpy(tcp_ses->server_RFC1001_name,
1698 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1699 tcp_ses->session_estab = false;
1700 tcp_ses->sequence_number = 0;
1701 tcp_ses->lstrp = jiffies;
1702 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1703 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1704 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1705
1706 /*
1707 * at this point we are the only ones with the pointer
1708 * to the struct since the kernel thread not created yet
1709 * no need to spinlock this init of tcpStatus or srv_count
1710 */
1711 tcp_ses->tcpStatus = CifsNew;
1712 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1713 sizeof(tcp_ses->srcaddr));
1714 ++tcp_ses->srv_count;
1715
1716 if (addr.ss_family == AF_INET6) {
1717 cFYI(1, "attempting ipv6 connect");
1718 /* BB should we allow ipv6 on port 139? */
1719 /* other OS never observed in Wild doing 139 with v6 */
1720 memcpy(&tcp_ses->dstaddr, sin_server6,
1721 sizeof(struct sockaddr_in6));
1722 } else
1723 memcpy(&tcp_ses->dstaddr, sin_server,
1724 sizeof(struct sockaddr_in));
1725
1726 rc = ip_connect(tcp_ses);
1727 if (rc < 0) {
1728 cERROR(1, "Error connecting to socket. Aborting operation");
1729 goto out_err_crypto_release;
1730 }
1731
1732 /*
1733 * since we're in a cifs function already, we know that
1734 * this will succeed. No need for try_module_get().
1735 */
1736 __module_get(THIS_MODULE);
1737 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1738 tcp_ses, "cifsd");
1739 if (IS_ERR(tcp_ses->tsk)) {
1740 rc = PTR_ERR(tcp_ses->tsk);
1741 cERROR(1, "error %d create cifsd thread", rc);
1742 module_put(THIS_MODULE);
1743 goto out_err_crypto_release;
1744 }
1745
1746 /* thread spawned, put it on the list */
1747 spin_lock(&cifs_tcp_ses_lock);
1748 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1749 spin_unlock(&cifs_tcp_ses_lock);
1750
1751 cifs_fscache_get_client_cookie(tcp_ses);
1752
1753 /* queue echo request delayed work */
1754 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1755
1756 return tcp_ses;
1757
1758 out_err_crypto_release:
1759 cifs_crypto_shash_release(tcp_ses);
1760
1761 put_net(cifs_net_ns(tcp_ses));
1762
1763 out_err:
1764 if (tcp_ses) {
1765 if (!IS_ERR(tcp_ses->hostname))
1766 kfree(tcp_ses->hostname);
1767 if (tcp_ses->ssocket)
1768 sock_release(tcp_ses->ssocket);
1769 kfree(tcp_ses);
1770 }
1771 return ERR_PTR(rc);
1772 }
1773
1774 static struct cifsSesInfo *
1775 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1776 {
1777 struct cifsSesInfo *ses;
1778
1779 spin_lock(&cifs_tcp_ses_lock);
1780 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1781 switch (server->secType) {
1782 case Kerberos:
1783 if (vol->cred_uid != ses->cred_uid)
1784 continue;
1785 break;
1786 default:
1787 /* anything else takes username/password */
1788 if (strncmp(ses->userName, vol->username,
1789 MAX_USERNAME_SIZE))
1790 continue;
1791 if (strlen(vol->username) != 0 &&
1792 ses->password != NULL &&
1793 strncmp(ses->password,
1794 vol->password ? vol->password : "",
1795 MAX_PASSWORD_SIZE))
1796 continue;
1797 }
1798 ++ses->ses_count;
1799 spin_unlock(&cifs_tcp_ses_lock);
1800 return ses;
1801 }
1802 spin_unlock(&cifs_tcp_ses_lock);
1803 return NULL;
1804 }
1805
1806 static void
1807 cifs_put_smb_ses(struct cifsSesInfo *ses)
1808 {
1809 int xid;
1810 struct TCP_Server_Info *server = ses->server;
1811
1812 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1813 spin_lock(&cifs_tcp_ses_lock);
1814 if (--ses->ses_count > 0) {
1815 spin_unlock(&cifs_tcp_ses_lock);
1816 return;
1817 }
1818
1819 list_del_init(&ses->smb_ses_list);
1820 spin_unlock(&cifs_tcp_ses_lock);
1821
1822 if (ses->status == CifsGood) {
1823 xid = GetXid();
1824 CIFSSMBLogoff(xid, ses);
1825 _FreeXid(xid);
1826 }
1827 sesInfoFree(ses);
1828 cifs_put_tcp_session(server);
1829 }
1830
1831 static struct cifsSesInfo *
1832 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1833 {
1834 int rc = -ENOMEM, xid;
1835 struct cifsSesInfo *ses;
1836 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1837 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1838
1839 xid = GetXid();
1840
1841 ses = cifs_find_smb_ses(server, volume_info);
1842 if (ses) {
1843 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1844
1845 mutex_lock(&ses->session_mutex);
1846 rc = cifs_negotiate_protocol(xid, ses);
1847 if (rc) {
1848 mutex_unlock(&ses->session_mutex);
1849 /* problem -- put our ses reference */
1850 cifs_put_smb_ses(ses);
1851 FreeXid(xid);
1852 return ERR_PTR(rc);
1853 }
1854 if (ses->need_reconnect) {
1855 cFYI(1, "Session needs reconnect");
1856 rc = cifs_setup_session(xid, ses,
1857 volume_info->local_nls);
1858 if (rc) {
1859 mutex_unlock(&ses->session_mutex);
1860 /* problem -- put our reference */
1861 cifs_put_smb_ses(ses);
1862 FreeXid(xid);
1863 return ERR_PTR(rc);
1864 }
1865 }
1866 mutex_unlock(&ses->session_mutex);
1867
1868 /* existing SMB ses has a server reference already */
1869 cifs_put_tcp_session(server);
1870 FreeXid(xid);
1871 return ses;
1872 }
1873
1874 cFYI(1, "Existing smb sess not found");
1875 ses = sesInfoAlloc();
1876 if (ses == NULL)
1877 goto get_ses_fail;
1878
1879 /* new SMB session uses our server ref */
1880 ses->server = server;
1881 if (server->dstaddr.ss_family == AF_INET6)
1882 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1883 else
1884 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1885
1886 if (volume_info->username)
1887 strncpy(ses->userName, volume_info->username,
1888 MAX_USERNAME_SIZE);
1889
1890 /* volume_info->password freed at unmount */
1891 if (volume_info->password) {
1892 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1893 if (!ses->password)
1894 goto get_ses_fail;
1895 }
1896 if (volume_info->domainname) {
1897 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1898 if (!ses->domainName)
1899 goto get_ses_fail;
1900 }
1901 ses->cred_uid = volume_info->cred_uid;
1902 ses->linux_uid = volume_info->linux_uid;
1903 ses->overrideSecFlg = volume_info->secFlg;
1904
1905 mutex_lock(&ses->session_mutex);
1906 rc = cifs_negotiate_protocol(xid, ses);
1907 if (!rc)
1908 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1909 mutex_unlock(&ses->session_mutex);
1910 if (rc)
1911 goto get_ses_fail;
1912
1913 /* success, put it on the list */
1914 spin_lock(&cifs_tcp_ses_lock);
1915 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1916 spin_unlock(&cifs_tcp_ses_lock);
1917
1918 FreeXid(xid);
1919 return ses;
1920
1921 get_ses_fail:
1922 sesInfoFree(ses);
1923 FreeXid(xid);
1924 return ERR_PTR(rc);
1925 }
1926
1927 static struct cifsTconInfo *
1928 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1929 {
1930 struct list_head *tmp;
1931 struct cifsTconInfo *tcon;
1932
1933 spin_lock(&cifs_tcp_ses_lock);
1934 list_for_each(tmp, &ses->tcon_list) {
1935 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1936 if (tcon->tidStatus == CifsExiting)
1937 continue;
1938 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1939 continue;
1940
1941 ++tcon->tc_count;
1942 spin_unlock(&cifs_tcp_ses_lock);
1943 return tcon;
1944 }
1945 spin_unlock(&cifs_tcp_ses_lock);
1946 return NULL;
1947 }
1948
1949 static void
1950 cifs_put_tcon(struct cifsTconInfo *tcon)
1951 {
1952 int xid;
1953 struct cifsSesInfo *ses = tcon->ses;
1954
1955 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1956 spin_lock(&cifs_tcp_ses_lock);
1957 if (--tcon->tc_count > 0) {
1958 spin_unlock(&cifs_tcp_ses_lock);
1959 return;
1960 }
1961
1962 list_del_init(&tcon->tcon_list);
1963 spin_unlock(&cifs_tcp_ses_lock);
1964
1965 xid = GetXid();
1966 CIFSSMBTDis(xid, tcon);
1967 _FreeXid(xid);
1968
1969 cifs_fscache_release_super_cookie(tcon);
1970 tconInfoFree(tcon);
1971 cifs_put_smb_ses(ses);
1972 }
1973
1974 static struct cifsTconInfo *
1975 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1976 {
1977 int rc, xid;
1978 struct cifsTconInfo *tcon;
1979
1980 tcon = cifs_find_tcon(ses, volume_info->UNC);
1981 if (tcon) {
1982 cFYI(1, "Found match on UNC path");
1983 /* existing tcon already has a reference */
1984 cifs_put_smb_ses(ses);
1985 if (tcon->seal != volume_info->seal)
1986 cERROR(1, "transport encryption setting "
1987 "conflicts with existing tid");
1988 return tcon;
1989 }
1990
1991 tcon = tconInfoAlloc();
1992 if (tcon == NULL) {
1993 rc = -ENOMEM;
1994 goto out_fail;
1995 }
1996
1997 tcon->ses = ses;
1998 if (volume_info->password) {
1999 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2000 if (!tcon->password) {
2001 rc = -ENOMEM;
2002 goto out_fail;
2003 }
2004 }
2005
2006 if (strchr(volume_info->UNC + 3, '\\') == NULL
2007 && strchr(volume_info->UNC + 3, '/') == NULL) {
2008 cERROR(1, "Missing share name");
2009 rc = -ENODEV;
2010 goto out_fail;
2011 }
2012
2013 /* BB Do we need to wrap session_mutex around
2014 * this TCon call and Unix SetFS as
2015 * we do on SessSetup and reconnect? */
2016 xid = GetXid();
2017 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2018 FreeXid(xid);
2019 cFYI(1, "CIFS Tcon rc = %d", rc);
2020 if (rc)
2021 goto out_fail;
2022
2023 if (volume_info->nodfs) {
2024 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2025 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2026 }
2027 tcon->seal = volume_info->seal;
2028 /* we can have only one retry value for a connection
2029 to a share so for resources mounted more than once
2030 to the same server share the last value passed in
2031 for the retry flag is used */
2032 tcon->retry = volume_info->retry;
2033 tcon->nocase = volume_info->nocase;
2034 tcon->local_lease = volume_info->local_lease;
2035
2036 spin_lock(&cifs_tcp_ses_lock);
2037 list_add(&tcon->tcon_list, &ses->tcon_list);
2038 spin_unlock(&cifs_tcp_ses_lock);
2039
2040 cifs_fscache_get_super_cookie(tcon);
2041
2042 return tcon;
2043
2044 out_fail:
2045 tconInfoFree(tcon);
2046 return ERR_PTR(rc);
2047 }
2048
2049 void
2050 cifs_put_tlink(struct tcon_link *tlink)
2051 {
2052 if (!tlink || IS_ERR(tlink))
2053 return;
2054
2055 if (!atomic_dec_and_test(&tlink->tl_count) ||
2056 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2057 tlink->tl_time = jiffies;
2058 return;
2059 }
2060
2061 if (!IS_ERR(tlink_tcon(tlink)))
2062 cifs_put_tcon(tlink_tcon(tlink));
2063 kfree(tlink);
2064 return;
2065 }
2066
2067 int
2068 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2069 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2070 struct dfs_info3_param **preferrals, int remap)
2071 {
2072 char *temp_unc;
2073 int rc = 0;
2074
2075 *pnum_referrals = 0;
2076 *preferrals = NULL;
2077
2078 if (pSesInfo->ipc_tid == 0) {
2079 temp_unc = kmalloc(2 /* for slashes */ +
2080 strnlen(pSesInfo->serverName,
2081 SERVER_NAME_LEN_WITH_NULL * 2)
2082 + 1 + 4 /* slash IPC$ */ + 2,
2083 GFP_KERNEL);
2084 if (temp_unc == NULL)
2085 return -ENOMEM;
2086 temp_unc[0] = '\\';
2087 temp_unc[1] = '\\';
2088 strcpy(temp_unc + 2, pSesInfo->serverName);
2089 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2090 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2091 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2092 kfree(temp_unc);
2093 }
2094 if (rc == 0)
2095 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2096 pnum_referrals, nls_codepage, remap);
2097 /* BB map targetUNCs to dfs_info3 structures, here or
2098 in CIFSGetDFSRefer BB */
2099
2100 return rc;
2101 }
2102
2103 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2104 static struct lock_class_key cifs_key[2];
2105 static struct lock_class_key cifs_slock_key[2];
2106
2107 static inline void
2108 cifs_reclassify_socket4(struct socket *sock)
2109 {
2110 struct sock *sk = sock->sk;
2111 BUG_ON(sock_owned_by_user(sk));
2112 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2113 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2114 }
2115
2116 static inline void
2117 cifs_reclassify_socket6(struct socket *sock)
2118 {
2119 struct sock *sk = sock->sk;
2120 BUG_ON(sock_owned_by_user(sk));
2121 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2122 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2123 }
2124 #else
2125 static inline void
2126 cifs_reclassify_socket4(struct socket *sock)
2127 {
2128 }
2129
2130 static inline void
2131 cifs_reclassify_socket6(struct socket *sock)
2132 {
2133 }
2134 #endif
2135
2136 /* See RFC1001 section 14 on representation of Netbios names */
2137 static void rfc1002mangle(char *target, char *source, unsigned int length)
2138 {
2139 unsigned int i, j;
2140
2141 for (i = 0, j = 0; i < (length); i++) {
2142 /* mask a nibble at a time and encode */
2143 target[j] = 'A' + (0x0F & (source[i] >> 4));
2144 target[j+1] = 'A' + (0x0F & source[i]);
2145 j += 2;
2146 }
2147
2148 }
2149
2150 static int
2151 bind_socket(struct TCP_Server_Info *server)
2152 {
2153 int rc = 0;
2154 if (server->srcaddr.ss_family != AF_UNSPEC) {
2155 /* Bind to the specified local IP address */
2156 struct socket *socket = server->ssocket;
2157 rc = socket->ops->bind(socket,
2158 (struct sockaddr *) &server->srcaddr,
2159 sizeof(server->srcaddr));
2160 if (rc < 0) {
2161 struct sockaddr_in *saddr4;
2162 struct sockaddr_in6 *saddr6;
2163 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2164 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2165 if (saddr6->sin6_family == AF_INET6)
2166 cERROR(1, "cifs: "
2167 "Failed to bind to: %pI6c, error: %d\n",
2168 &saddr6->sin6_addr, rc);
2169 else
2170 cERROR(1, "cifs: "
2171 "Failed to bind to: %pI4, error: %d\n",
2172 &saddr4->sin_addr.s_addr, rc);
2173 }
2174 }
2175 return rc;
2176 }
2177
2178 static int
2179 ip_rfc1001_connect(struct TCP_Server_Info *server)
2180 {
2181 int rc = 0;
2182 /*
2183 * some servers require RFC1001 sessinit before sending
2184 * negprot - BB check reconnection in case where second
2185 * sessinit is sent but no second negprot
2186 */
2187 struct rfc1002_session_packet *ses_init_buf;
2188 struct smb_hdr *smb_buf;
2189 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2190 GFP_KERNEL);
2191 if (ses_init_buf) {
2192 ses_init_buf->trailer.session_req.called_len = 32;
2193
2194 if (server->server_RFC1001_name &&
2195 server->server_RFC1001_name[0] != 0)
2196 rfc1002mangle(ses_init_buf->trailer.
2197 session_req.called_name,
2198 server->server_RFC1001_name,
2199 RFC1001_NAME_LEN_WITH_NULL);
2200 else
2201 rfc1002mangle(ses_init_buf->trailer.
2202 session_req.called_name,
2203 DEFAULT_CIFS_CALLED_NAME,
2204 RFC1001_NAME_LEN_WITH_NULL);
2205
2206 ses_init_buf->trailer.session_req.calling_len = 32;
2207
2208 /*
2209 * calling name ends in null (byte 16) from old smb
2210 * convention.
2211 */
2212 if (server->workstation_RFC1001_name &&
2213 server->workstation_RFC1001_name[0] != 0)
2214 rfc1002mangle(ses_init_buf->trailer.
2215 session_req.calling_name,
2216 server->workstation_RFC1001_name,
2217 RFC1001_NAME_LEN_WITH_NULL);
2218 else
2219 rfc1002mangle(ses_init_buf->trailer.
2220 session_req.calling_name,
2221 "LINUX_CIFS_CLNT",
2222 RFC1001_NAME_LEN_WITH_NULL);
2223
2224 ses_init_buf->trailer.session_req.scope1 = 0;
2225 ses_init_buf->trailer.session_req.scope2 = 0;
2226 smb_buf = (struct smb_hdr *)ses_init_buf;
2227
2228 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2229 smb_buf->smb_buf_length = 0x81000044;
2230 rc = smb_send(server, smb_buf, 0x44);
2231 kfree(ses_init_buf);
2232 /*
2233 * RFC1001 layer in at least one server
2234 * requires very short break before negprot
2235 * presumably because not expecting negprot
2236 * to follow so fast. This is a simple
2237 * solution that works without
2238 * complicating the code and causes no
2239 * significant slowing down on mount
2240 * for everyone else
2241 */
2242 usleep_range(1000, 2000);
2243 }
2244 /*
2245 * else the negprot may still work without this
2246 * even though malloc failed
2247 */
2248
2249 return rc;
2250 }
2251
2252 static int
2253 generic_ip_connect(struct TCP_Server_Info *server)
2254 {
2255 int rc = 0;
2256 unsigned short int sport;
2257 int slen, sfamily;
2258 struct socket *socket = server->ssocket;
2259 struct sockaddr *saddr;
2260
2261 saddr = (struct sockaddr *) &server->dstaddr;
2262
2263 if (server->dstaddr.ss_family == AF_INET6) {
2264 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2265 slen = sizeof(struct sockaddr_in6);
2266 sfamily = AF_INET6;
2267 } else {
2268 sport = ((struct sockaddr_in *) saddr)->sin_port;
2269 slen = sizeof(struct sockaddr_in);
2270 sfamily = AF_INET;
2271 }
2272
2273 if (socket == NULL) {
2274 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2275 IPPROTO_TCP, &socket, 1);
2276 if (rc < 0) {
2277 cERROR(1, "Error %d creating socket", rc);
2278 server->ssocket = NULL;
2279 return rc;
2280 }
2281
2282 /* BB other socket options to set KEEPALIVE, NODELAY? */
2283 cFYI(1, "Socket created");
2284 server->ssocket = socket;
2285 socket->sk->sk_allocation = GFP_NOFS;
2286 if (sfamily == AF_INET6)
2287 cifs_reclassify_socket6(socket);
2288 else
2289 cifs_reclassify_socket4(socket);
2290 }
2291
2292 rc = bind_socket(server);
2293 if (rc < 0)
2294 return rc;
2295
2296 rc = socket->ops->connect(socket, saddr, slen, 0);
2297 if (rc < 0) {
2298 cFYI(1, "Error %d connecting to server", rc);
2299 sock_release(socket);
2300 server->ssocket = NULL;
2301 return rc;
2302 }
2303
2304 /*
2305 * Eventually check for other socket options to change from
2306 * the default. sock_setsockopt not used because it expects
2307 * user space buffer
2308 */
2309 socket->sk->sk_rcvtimeo = 7 * HZ;
2310 socket->sk->sk_sndtimeo = 5 * HZ;
2311
2312 /* make the bufsizes depend on wsize/rsize and max requests */
2313 if (server->noautotune) {
2314 if (socket->sk->sk_sndbuf < (200 * 1024))
2315 socket->sk->sk_sndbuf = 200 * 1024;
2316 if (socket->sk->sk_rcvbuf < (140 * 1024))
2317 socket->sk->sk_rcvbuf = 140 * 1024;
2318 }
2319
2320 if (server->tcp_nodelay) {
2321 int val = 1;
2322 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2323 (char *)&val, sizeof(val));
2324 if (rc)
2325 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2326 }
2327
2328 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2329 socket->sk->sk_sndbuf,
2330 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2331
2332 if (sport == htons(RFC1001_PORT))
2333 rc = ip_rfc1001_connect(server);
2334
2335 return rc;
2336 }
2337
2338 static int
2339 ip_connect(struct TCP_Server_Info *server)
2340 {
2341 unsigned short int *sport;
2342 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2343 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2344
2345 if (server->dstaddr.ss_family == AF_INET6)
2346 sport = &addr6->sin6_port;
2347 else
2348 sport = &addr->sin_port;
2349
2350 if (*sport == 0) {
2351 int rc;
2352
2353 /* try with 445 port at first */
2354 *sport = htons(CIFS_PORT);
2355
2356 rc = generic_ip_connect(server);
2357 if (rc >= 0)
2358 return rc;
2359
2360 /* if it failed, try with 139 port */
2361 *sport = htons(RFC1001_PORT);
2362 }
2363
2364 return generic_ip_connect(server);
2365 }
2366
2367 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2368 struct super_block *sb, struct smb_vol *vol_info)
2369 {
2370 /* if we are reconnecting then should we check to see if
2371 * any requested capabilities changed locally e.g. via
2372 * remount but we can not do much about it here
2373 * if they have (even if we could detect it by the following)
2374 * Perhaps we could add a backpointer to array of sb from tcon
2375 * or if we change to make all sb to same share the same
2376 * sb as NFS - then we only have one backpointer to sb.
2377 * What if we wanted to mount the server share twice once with
2378 * and once without posixacls or posix paths? */
2379 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2380
2381 if (vol_info && vol_info->no_linux_ext) {
2382 tcon->fsUnixInfo.Capability = 0;
2383 tcon->unix_ext = 0; /* Unix Extensions disabled */
2384 cFYI(1, "Linux protocol extensions disabled");
2385 return;
2386 } else if (vol_info)
2387 tcon->unix_ext = 1; /* Unix Extensions supported */
2388
2389 if (tcon->unix_ext == 0) {
2390 cFYI(1, "Unix extensions disabled so not set on reconnect");
2391 return;
2392 }
2393
2394 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2395 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2396
2397 /* check for reconnect case in which we do not
2398 want to change the mount behavior if we can avoid it */
2399 if (vol_info == NULL) {
2400 /* turn off POSIX ACL and PATHNAMES if not set
2401 originally at mount time */
2402 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2403 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2404 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2405 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2406 cERROR(1, "POSIXPATH support change");
2407 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2408 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2409 cERROR(1, "possible reconnect error");
2410 cERROR(1, "server disabled POSIX path support");
2411 }
2412 }
2413
2414 cap &= CIFS_UNIX_CAP_MASK;
2415 if (vol_info && vol_info->no_psx_acl)
2416 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2417 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2418 cFYI(1, "negotiated posix acl support");
2419 if (sb)
2420 sb->s_flags |= MS_POSIXACL;
2421 }
2422
2423 if (vol_info && vol_info->posix_paths == 0)
2424 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2425 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2426 cFYI(1, "negotiate posix pathnames");
2427 if (sb)
2428 CIFS_SB(sb)->mnt_cifs_flags |=
2429 CIFS_MOUNT_POSIX_PATHS;
2430 }
2431
2432 /* We might be setting the path sep back to a different
2433 form if we are reconnecting and the server switched its
2434 posix path capability for this share */
2435 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2436 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2437
2438 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2439 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2440 CIFS_SB(sb)->rsize = 127 * 1024;
2441 cFYI(DBG2, "larger reads not supported by srv");
2442 }
2443 }
2444
2445
2446 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2447 #ifdef CONFIG_CIFS_DEBUG2
2448 if (cap & CIFS_UNIX_FCNTL_CAP)
2449 cFYI(1, "FCNTL cap");
2450 if (cap & CIFS_UNIX_EXTATTR_CAP)
2451 cFYI(1, "EXTATTR cap");
2452 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2453 cFYI(1, "POSIX path cap");
2454 if (cap & CIFS_UNIX_XATTR_CAP)
2455 cFYI(1, "XATTR cap");
2456 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2457 cFYI(1, "POSIX ACL cap");
2458 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2459 cFYI(1, "very large read cap");
2460 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2461 cFYI(1, "very large write cap");
2462 #endif /* CIFS_DEBUG2 */
2463 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2464 if (vol_info == NULL) {
2465 cFYI(1, "resetting capabilities failed");
2466 } else
2467 cERROR(1, "Negotiating Unix capabilities "
2468 "with the server failed. Consider "
2469 "mounting with the Unix Extensions\n"
2470 "disabled, if problems are found, "
2471 "by specifying the nounix mount "
2472 "option.");
2473
2474 }
2475 }
2476 }
2477
2478 static void
2479 convert_delimiter(char *path, char delim)
2480 {
2481 int i;
2482 char old_delim;
2483
2484 if (path == NULL)
2485 return;
2486
2487 if (delim == '/')
2488 old_delim = '\\';
2489 else
2490 old_delim = '/';
2491
2492 for (i = 0; path[i] != '\0'; i++) {
2493 if (path[i] == old_delim)
2494 path[i] = delim;
2495 }
2496 }
2497
2498 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2499 struct cifs_sb_info *cifs_sb)
2500 {
2501 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2502
2503 if (pvolume_info->rsize > CIFSMaxBufSize) {
2504 cERROR(1, "rsize %d too large, using MaxBufSize",
2505 pvolume_info->rsize);
2506 cifs_sb->rsize = CIFSMaxBufSize;
2507 } else if ((pvolume_info->rsize) &&
2508 (pvolume_info->rsize <= CIFSMaxBufSize))
2509 cifs_sb->rsize = pvolume_info->rsize;
2510 else /* default */
2511 cifs_sb->rsize = CIFSMaxBufSize;
2512
2513 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2514 cERROR(1, "wsize %d too large, using 4096 instead",
2515 pvolume_info->wsize);
2516 cifs_sb->wsize = 4096;
2517 } else if (pvolume_info->wsize)
2518 cifs_sb->wsize = pvolume_info->wsize;
2519 else
2520 cifs_sb->wsize = min_t(const int,
2521 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2522 127*1024);
2523 /* old default of CIFSMaxBufSize was too small now
2524 that SMB Write2 can send multiple pages in kvec.
2525 RFC1001 does not describe what happens when frame
2526 bigger than 128K is sent so use that as max in
2527 conjunction with 52K kvec constraint on arch with 4K
2528 page size */
2529
2530 if (cifs_sb->rsize < 2048) {
2531 cifs_sb->rsize = 2048;
2532 /* Windows ME may prefer this */
2533 cFYI(1, "readsize set to minimum: 2048");
2534 }
2535 /* calculate prepath */
2536 cifs_sb->prepath = pvolume_info->prepath;
2537 if (cifs_sb->prepath) {
2538 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2539 /* we can not convert the / to \ in the path
2540 separators in the prefixpath yet because we do not
2541 know (until reset_cifs_unix_caps is called later)
2542 whether POSIX PATH CAP is available. We normalize
2543 the / to \ after reset_cifs_unix_caps is called */
2544 pvolume_info->prepath = NULL;
2545 } else
2546 cifs_sb->prepathlen = 0;
2547 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2548 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2549 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2550 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2551 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2552 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2553
2554 cifs_sb->actimeo = pvolume_info->actimeo;
2555
2556 if (pvolume_info->noperm)
2557 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2558 if (pvolume_info->setuids)
2559 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2560 if (pvolume_info->server_ino)
2561 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2562 if (pvolume_info->remap)
2563 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2564 if (pvolume_info->no_xattr)
2565 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2566 if (pvolume_info->sfu_emul)
2567 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2568 if (pvolume_info->nobrl)
2569 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2570 if (pvolume_info->nostrictsync)
2571 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2572 if (pvolume_info->mand_lock)
2573 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2574 if (pvolume_info->cifs_acl)
2575 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2576 if (pvolume_info->override_uid)
2577 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2578 if (pvolume_info->override_gid)
2579 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2580 if (pvolume_info->dynperm)
2581 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2582 if (pvolume_info->fsc)
2583 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2584 if (pvolume_info->multiuser)
2585 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2586 CIFS_MOUNT_NO_PERM);
2587 if (pvolume_info->strict_io)
2588 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2589 if (pvolume_info->direct_io) {
2590 cFYI(1, "mounting share using direct i/o");
2591 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2592 }
2593 if (pvolume_info->mfsymlinks) {
2594 if (pvolume_info->sfu_emul) {
2595 cERROR(1, "mount option mfsymlinks ignored if sfu "
2596 "mount option is used");
2597 } else {
2598 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2599 }
2600 }
2601
2602 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2603 cERROR(1, "mount option dynperm ignored if cifsacl "
2604 "mount option supported");
2605 }
2606
2607 static int
2608 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2609 struct cifs_sb_info *cifs_sb, const char *full_path)
2610 {
2611 int rc;
2612 FILE_ALL_INFO *pfile_info;
2613
2614 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2615 if (pfile_info == NULL)
2616 return -ENOMEM;
2617
2618 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2619 0 /* not legacy */, cifs_sb->local_nls,
2620 cifs_sb->mnt_cifs_flags &
2621 CIFS_MOUNT_MAP_SPECIAL_CHR);
2622 kfree(pfile_info);
2623 return rc;
2624 }
2625
2626 static void
2627 cleanup_volume_info(struct smb_vol **pvolume_info)
2628 {
2629 struct smb_vol *volume_info;
2630
2631 if (!pvolume_info || !*pvolume_info)
2632 return;
2633
2634 volume_info = *pvolume_info;
2635 kzfree(volume_info->password);
2636 kfree(volume_info->UNC);
2637 kfree(volume_info->prepath);
2638 kfree(volume_info);
2639 *pvolume_info = NULL;
2640 return;
2641 }
2642
2643 #ifdef CONFIG_CIFS_DFS_UPCALL
2644 /* build_path_to_root returns full path to root when
2645 * we do not have an exiting connection (tcon) */
2646 static char *
2647 build_unc_path_to_root(const struct smb_vol *volume_info,
2648 const struct cifs_sb_info *cifs_sb)
2649 {
2650 char *full_path;
2651
2652 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2653 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2654 if (full_path == NULL)
2655 return ERR_PTR(-ENOMEM);
2656
2657 strncpy(full_path, volume_info->UNC, unc_len);
2658 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2659 int i;
2660 for (i = 0; i < unc_len; i++) {
2661 if (full_path[i] == '\\')
2662 full_path[i] = '/';
2663 }
2664 }
2665
2666 if (cifs_sb->prepathlen)
2667 strncpy(full_path + unc_len, cifs_sb->prepath,
2668 cifs_sb->prepathlen);
2669
2670 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2671 return full_path;
2672 }
2673 #endif
2674
2675 int
2676 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2677 char *mount_data_global, const char *devname)
2678 {
2679 int rc;
2680 int xid;
2681 struct smb_vol *volume_info;
2682 struct cifsSesInfo *pSesInfo;
2683 struct cifsTconInfo *tcon;
2684 struct TCP_Server_Info *srvTcp;
2685 char *full_path;
2686 char *mount_data = mount_data_global;
2687 struct tcon_link *tlink;
2688 #ifdef CONFIG_CIFS_DFS_UPCALL
2689 struct dfs_info3_param *referrals = NULL;
2690 unsigned int num_referrals = 0;
2691 int referral_walks_count = 0;
2692 try_mount_again:
2693 #endif
2694 rc = 0;
2695 tcon = NULL;
2696 pSesInfo = NULL;
2697 srvTcp = NULL;
2698 full_path = NULL;
2699 tlink = NULL;
2700
2701 xid = GetXid();
2702
2703 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2704 if (!volume_info) {
2705 rc = -ENOMEM;
2706 goto out;
2707 }
2708
2709 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2710 rc = -EINVAL;
2711 goto out;
2712 }
2713
2714 if (volume_info->nullauth) {
2715 cFYI(1, "null user");
2716 volume_info->username = "";
2717 } else if (volume_info->username) {
2718 /* BB fixme parse for domain name here */
2719 cFYI(1, "Username: %s", volume_info->username);
2720 } else {
2721 cifserror("No username specified");
2722 /* In userspace mount helper we can get user name from alternate
2723 locations such as env variables and files on disk */
2724 rc = -EINVAL;
2725 goto out;
2726 }
2727
2728 /* this is needed for ASCII cp to Unicode converts */
2729 if (volume_info->iocharset == NULL) {
2730 /* load_nls_default cannot return null */
2731 volume_info->local_nls = load_nls_default();
2732 } else {
2733 volume_info->local_nls = load_nls(volume_info->iocharset);
2734 if (volume_info->local_nls == NULL) {
2735 cERROR(1, "CIFS mount error: iocharset %s not found",
2736 volume_info->iocharset);
2737 rc = -ELIBACC;
2738 goto out;
2739 }
2740 }
2741 cifs_sb->local_nls = volume_info->local_nls;
2742
2743 /* get a reference to a tcp session */
2744 srvTcp = cifs_get_tcp_session(volume_info);
2745 if (IS_ERR(srvTcp)) {
2746 rc = PTR_ERR(srvTcp);
2747 goto out;
2748 }
2749
2750 /* get a reference to a SMB session */
2751 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2752 if (IS_ERR(pSesInfo)) {
2753 rc = PTR_ERR(pSesInfo);
2754 pSesInfo = NULL;
2755 goto mount_fail_check;
2756 }
2757
2758 setup_cifs_sb(volume_info, cifs_sb);
2759 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2760 sb->s_maxbytes = MAX_LFS_FILESIZE;
2761 else
2762 sb->s_maxbytes = MAX_NON_LFS;
2763
2764 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2765 sb->s_time_gran = 100;
2766
2767 /* search for existing tcon to this server share */
2768 tcon = cifs_get_tcon(pSesInfo, volume_info);
2769 if (IS_ERR(tcon)) {
2770 rc = PTR_ERR(tcon);
2771 tcon = NULL;
2772 goto remote_path_check;
2773 }
2774
2775 /* do not care if following two calls succeed - informational */
2776 if (!tcon->ipc) {
2777 CIFSSMBQFSDeviceInfo(xid, tcon);
2778 CIFSSMBQFSAttributeInfo(xid, tcon);
2779 }
2780
2781 /* tell server which Unix caps we support */
2782 if (tcon->ses->capabilities & CAP_UNIX)
2783 /* reset of caps checks mount to see if unix extensions
2784 disabled for just this mount */
2785 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2786 else
2787 tcon->unix_ext = 0; /* server does not support them */
2788
2789 /* convert forward to back slashes in prepath here if needed */
2790 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2791 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2792
2793 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2794 cifs_sb->rsize = 1024 * 127;
2795 cFYI(DBG2, "no very large read support, rsize now 127K");
2796 }
2797 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2798 cifs_sb->wsize = min(cifs_sb->wsize,
2799 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2800 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2801 cifs_sb->rsize = min(cifs_sb->rsize,
2802 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2803
2804 remote_path_check:
2805 /* check if a whole path (including prepath) is not remote */
2806 if (!rc && cifs_sb->prepathlen && tcon) {
2807 /* build_path_to_root works only when we have a valid tcon */
2808 full_path = cifs_build_path_to_root(cifs_sb, tcon);
2809 if (full_path == NULL) {
2810 rc = -ENOMEM;
2811 goto mount_fail_check;
2812 }
2813 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2814 if (rc != 0 && rc != -EREMOTE) {
2815 kfree(full_path);
2816 goto mount_fail_check;
2817 }
2818 kfree(full_path);
2819 }
2820
2821 /* get referral if needed */
2822 if (rc == -EREMOTE) {
2823 #ifdef CONFIG_CIFS_DFS_UPCALL
2824 if (referral_walks_count > MAX_NESTED_LINKS) {
2825 /*
2826 * BB: when we implement proper loop detection,
2827 * we will remove this check. But now we need it
2828 * to prevent an indefinite loop if 'DFS tree' is
2829 * misconfigured (i.e. has loops).
2830 */
2831 rc = -ELOOP;
2832 goto mount_fail_check;
2833 }
2834 /* convert forward to back slashes in prepath here if needed */
2835 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2836 convert_delimiter(cifs_sb->prepath,
2837 CIFS_DIR_SEP(cifs_sb));
2838 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2839 if (IS_ERR(full_path)) {
2840 rc = PTR_ERR(full_path);
2841 goto mount_fail_check;
2842 }
2843
2844 cFYI(1, "Getting referral for: %s", full_path);
2845 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2846 cifs_sb->local_nls, &num_referrals, &referrals,
2847 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2848 if (!rc && num_referrals > 0) {
2849 char *fake_devname = NULL;
2850
2851 if (mount_data != mount_data_global)
2852 kfree(mount_data);
2853
2854 mount_data = cifs_compose_mount_options(
2855 cifs_sb->mountdata, full_path + 1,
2856 referrals, &fake_devname);
2857
2858 free_dfs_info_array(referrals, num_referrals);
2859 kfree(fake_devname);
2860 kfree(full_path);
2861
2862 if (IS_ERR(mount_data)) {
2863 rc = PTR_ERR(mount_data);
2864 mount_data = NULL;
2865 goto mount_fail_check;
2866 }
2867
2868 if (tcon)
2869 cifs_put_tcon(tcon);
2870 else if (pSesInfo)
2871 cifs_put_smb_ses(pSesInfo);
2872
2873 cleanup_volume_info(&volume_info);
2874 referral_walks_count++;
2875 FreeXid(xid);
2876 goto try_mount_again;
2877 }
2878 #else /* No DFS support, return error on mount */
2879 rc = -EOPNOTSUPP;
2880 #endif
2881 }
2882
2883 if (rc)
2884 goto mount_fail_check;
2885
2886 /* now, hang the tcon off of the superblock */
2887 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2888 if (tlink == NULL) {
2889 rc = -ENOMEM;
2890 goto mount_fail_check;
2891 }
2892
2893 tlink->tl_uid = pSesInfo->linux_uid;
2894 tlink->tl_tcon = tcon;
2895 tlink->tl_time = jiffies;
2896 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2897 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2898
2899 cifs_sb->master_tlink = tlink;
2900 spin_lock(&cifs_sb->tlink_tree_lock);
2901 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
2902 spin_unlock(&cifs_sb->tlink_tree_lock);
2903
2904 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
2905 TLINK_IDLE_EXPIRE);
2906
2907 mount_fail_check:
2908 /* on error free sesinfo and tcon struct if needed */
2909 if (rc) {
2910 if (mount_data != mount_data_global)
2911 kfree(mount_data);
2912 /* If find_unc succeeded then rc == 0 so we can not end */
2913 /* up accidently freeing someone elses tcon struct */
2914 if (tcon)
2915 cifs_put_tcon(tcon);
2916 else if (pSesInfo)
2917 cifs_put_smb_ses(pSesInfo);
2918 else
2919 cifs_put_tcp_session(srvTcp);
2920 goto out;
2921 }
2922
2923 /* volume_info->password is freed above when existing session found
2924 (in which case it is not needed anymore) but when new sesion is created
2925 the password ptr is put in the new session structure (in which case the
2926 password will be freed at unmount time) */
2927 out:
2928 /* zero out password before freeing */
2929 cleanup_volume_info(&volume_info);
2930 FreeXid(xid);
2931 return rc;
2932 }
2933
2934 int
2935 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2936 const char *tree, struct cifsTconInfo *tcon,
2937 const struct nls_table *nls_codepage)
2938 {
2939 struct smb_hdr *smb_buffer;
2940 struct smb_hdr *smb_buffer_response;
2941 TCONX_REQ *pSMB;
2942 TCONX_RSP *pSMBr;
2943 unsigned char *bcc_ptr;
2944 int rc = 0;
2945 int length;
2946 __u16 bytes_left, count;
2947
2948 if (ses == NULL)
2949 return -EIO;
2950
2951 smb_buffer = cifs_buf_get();
2952 if (smb_buffer == NULL)
2953 return -ENOMEM;
2954
2955 smb_buffer_response = smb_buffer;
2956
2957 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2958 NULL /*no tid */ , 4 /*wct */ );
2959
2960 smb_buffer->Mid = GetNextMid(ses->server);
2961 smb_buffer->Uid = ses->Suid;
2962 pSMB = (TCONX_REQ *) smb_buffer;
2963 pSMBr = (TCONX_RSP *) smb_buffer_response;
2964
2965 pSMB->AndXCommand = 0xFF;
2966 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2967 bcc_ptr = &pSMB->Password[0];
2968 if ((ses->server->secMode) & SECMODE_USER) {
2969 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2970 *bcc_ptr = 0; /* password is null byte */
2971 bcc_ptr++; /* skip password */
2972 /* already aligned so no need to do it below */
2973 } else {
2974 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
2975 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2976 specified as required (when that support is added to
2977 the vfs in the future) as only NTLM or the much
2978 weaker LANMAN (which we do not send by default) is accepted
2979 by Samba (not sure whether other servers allow
2980 NTLMv2 password here) */
2981 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2982 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2983 (ses->server->secType == LANMAN))
2984 calc_lanman_hash(tcon->password, ses->server->cryptkey,
2985 ses->server->secMode &
2986 SECMODE_PW_ENCRYPT ? true : false,
2987 bcc_ptr);
2988 else
2989 #endif /* CIFS_WEAK_PW_HASH */
2990 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
2991 bcc_ptr);
2992
2993 bcc_ptr += CIFS_AUTH_RESP_SIZE;
2994 if (ses->capabilities & CAP_UNICODE) {
2995 /* must align unicode strings */
2996 *bcc_ptr = 0; /* null byte password */
2997 bcc_ptr++;
2998 }
2999 }
3000
3001 if (ses->server->secMode &
3002 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3003 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3004
3005 if (ses->capabilities & CAP_STATUS32) {
3006 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3007 }
3008 if (ses->capabilities & CAP_DFS) {
3009 smb_buffer->Flags2 |= SMBFLG2_DFS;
3010 }
3011 if (ses->capabilities & CAP_UNICODE) {
3012 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3013 length =
3014 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3015 6 /* max utf8 char length in bytes */ *
3016 (/* server len*/ + 256 /* share len */), nls_codepage);
3017 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3018 bcc_ptr += 2; /* skip trailing null */
3019 } else { /* ASCII */
3020 strcpy(bcc_ptr, tree);
3021 bcc_ptr += strlen(tree) + 1;
3022 }
3023 strcpy(bcc_ptr, "?????");
3024 bcc_ptr += strlen("?????");
3025 bcc_ptr += 1;
3026 count = bcc_ptr - &pSMB->Password[0];
3027 pSMB->hdr.smb_buf_length += count;
3028 pSMB->ByteCount = cpu_to_le16(count);
3029
3030 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3031 0);
3032
3033 /* above now done in SendReceive */
3034 if ((rc == 0) && (tcon != NULL)) {
3035 bool is_unicode;
3036
3037 tcon->tidStatus = CifsGood;
3038 tcon->need_reconnect = false;
3039 tcon->tid = smb_buffer_response->Tid;
3040 bcc_ptr = pByteArea(smb_buffer_response);
3041 bytes_left = get_bcc(smb_buffer_response);
3042 length = strnlen(bcc_ptr, bytes_left - 2);
3043 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3044 is_unicode = true;
3045 else
3046 is_unicode = false;
3047
3048
3049 /* skip service field (NB: this field is always ASCII) */
3050 if (length == 3) {
3051 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3052 (bcc_ptr[2] == 'C')) {
3053 cFYI(1, "IPC connection");
3054 tcon->ipc = 1;
3055 }
3056 } else if (length == 2) {
3057 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3058 /* the most common case */
3059 cFYI(1, "disk share connection");
3060 }
3061 }
3062 bcc_ptr += length + 1;
3063 bytes_left -= (length + 1);
3064 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3065
3066 /* mostly informational -- no need to fail on error here */
3067 kfree(tcon->nativeFileSystem);
3068 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3069 bytes_left, is_unicode,
3070 nls_codepage);
3071
3072 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3073
3074 if ((smb_buffer_response->WordCount == 3) ||
3075 (smb_buffer_response->WordCount == 7))
3076 /* field is in same location */
3077 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3078 else
3079 tcon->Flags = 0;
3080 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3081 } else if ((rc == 0) && tcon == NULL) {
3082 /* all we need to save for IPC$ connection */
3083 ses->ipc_tid = smb_buffer_response->Tid;
3084 }
3085
3086 cifs_buf_release(smb_buffer);
3087 return rc;
3088 }
3089
3090 int
3091 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3092 {
3093 struct rb_root *root = &cifs_sb->tlink_tree;
3094 struct rb_node *node;
3095 struct tcon_link *tlink;
3096 char *tmp;
3097
3098 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3099
3100 spin_lock(&cifs_sb->tlink_tree_lock);
3101 while ((node = rb_first(root))) {
3102 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3103 cifs_get_tlink(tlink);
3104 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3105 rb_erase(node, root);
3106
3107 spin_unlock(&cifs_sb->tlink_tree_lock);
3108 cifs_put_tlink(tlink);
3109 spin_lock(&cifs_sb->tlink_tree_lock);
3110 }
3111 spin_unlock(&cifs_sb->tlink_tree_lock);
3112
3113 tmp = cifs_sb->prepath;
3114 cifs_sb->prepathlen = 0;
3115 cifs_sb->prepath = NULL;
3116 kfree(tmp);
3117
3118 return 0;
3119 }
3120
3121 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3122 {
3123 int rc = 0;
3124 struct TCP_Server_Info *server = ses->server;
3125
3126 /* only send once per connect */
3127 if (server->maxBuf != 0)
3128 return 0;
3129
3130 rc = CIFSSMBNegotiate(xid, ses);
3131 if (rc == -EAGAIN) {
3132 /* retry only once on 1st time connection */
3133 rc = CIFSSMBNegotiate(xid, ses);
3134 if (rc == -EAGAIN)
3135 rc = -EHOSTDOWN;
3136 }
3137 if (rc == 0) {
3138 spin_lock(&GlobalMid_Lock);
3139 if (server->tcpStatus != CifsExiting)
3140 server->tcpStatus = CifsGood;
3141 else
3142 rc = -EHOSTDOWN;
3143 spin_unlock(&GlobalMid_Lock);
3144
3145 }
3146
3147 return rc;
3148 }
3149
3150
3151 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3152 struct nls_table *nls_info)
3153 {
3154 int rc = 0;
3155 struct TCP_Server_Info *server = ses->server;
3156
3157 ses->flags = 0;
3158 ses->capabilities = server->capabilities;
3159 if (linuxExtEnabled == 0)
3160 ses->capabilities &= (~CAP_UNIX);
3161
3162 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3163 server->secMode, server->capabilities, server->timeAdj);
3164
3165 rc = CIFS_SessSetup(xid, ses, nls_info);
3166 if (rc) {
3167 cERROR(1, "Send error in SessSetup = %d", rc);
3168 } else {
3169 mutex_lock(&ses->server->srv_mutex);
3170 if (!server->session_estab) {
3171 server->session_key.response = ses->auth_key.response;
3172 server->session_key.len = ses->auth_key.len;
3173 server->sequence_number = 0x2;
3174 server->session_estab = true;
3175 ses->auth_key.response = NULL;
3176 }
3177 mutex_unlock(&server->srv_mutex);
3178
3179 cFYI(1, "CIFS Session Established successfully");
3180 spin_lock(&GlobalMid_Lock);
3181 ses->status = CifsGood;
3182 ses->need_reconnect = false;
3183 spin_unlock(&GlobalMid_Lock);
3184 }
3185
3186 kfree(ses->auth_key.response);
3187 ses->auth_key.response = NULL;
3188 ses->auth_key.len = 0;
3189 kfree(ses->ntlmssp);
3190 ses->ntlmssp = NULL;
3191
3192 return rc;
3193 }
3194
3195 static struct cifsTconInfo *
3196 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3197 {
3198 struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3199 struct cifsSesInfo *ses;
3200 struct cifsTconInfo *tcon = NULL;
3201 struct smb_vol *vol_info;
3202 char username[MAX_USERNAME_SIZE + 1];
3203
3204 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3205 if (vol_info == NULL) {
3206 tcon = ERR_PTR(-ENOMEM);
3207 goto out;
3208 }
3209
3210 snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3211 vol_info->username = username;
3212 vol_info->local_nls = cifs_sb->local_nls;
3213 vol_info->linux_uid = fsuid;
3214 vol_info->cred_uid = fsuid;
3215 vol_info->UNC = master_tcon->treeName;
3216 vol_info->retry = master_tcon->retry;
3217 vol_info->nocase = master_tcon->nocase;
3218 vol_info->local_lease = master_tcon->local_lease;
3219 vol_info->no_linux_ext = !master_tcon->unix_ext;
3220
3221 /* FIXME: allow for other secFlg settings */
3222 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3223
3224 /* get a reference for the same TCP session */
3225 spin_lock(&cifs_tcp_ses_lock);
3226 ++master_tcon->ses->server->srv_count;
3227 spin_unlock(&cifs_tcp_ses_lock);
3228
3229 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3230 if (IS_ERR(ses)) {
3231 tcon = (struct cifsTconInfo *)ses;
3232 cifs_put_tcp_session(master_tcon->ses->server);
3233 goto out;
3234 }
3235
3236 tcon = cifs_get_tcon(ses, vol_info);
3237 if (IS_ERR(tcon)) {
3238 cifs_put_smb_ses(ses);
3239 goto out;
3240 }
3241
3242 if (ses->capabilities & CAP_UNIX)
3243 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3244 out:
3245 kfree(vol_info);
3246
3247 return tcon;
3248 }
3249
3250 static inline struct tcon_link *
3251 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3252 {
3253 return cifs_sb->master_tlink;
3254 }
3255
3256 struct cifsTconInfo *
3257 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3258 {
3259 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3260 }
3261
3262 static int
3263 cifs_sb_tcon_pending_wait(void *unused)
3264 {
3265 schedule();
3266 return signal_pending(current) ? -ERESTARTSYS : 0;
3267 }
3268
3269 /* find and return a tlink with given uid */
3270 static struct tcon_link *
3271 tlink_rb_search(struct rb_root *root, uid_t uid)
3272 {
3273 struct rb_node *node = root->rb_node;
3274 struct tcon_link *tlink;
3275
3276 while (node) {
3277 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3278
3279 if (tlink->tl_uid > uid)
3280 node = node->rb_left;
3281 else if (tlink->tl_uid < uid)
3282 node = node->rb_right;
3283 else
3284 return tlink;
3285 }
3286 return NULL;
3287 }
3288
3289 /* insert a tcon_link into the tree */
3290 static void
3291 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3292 {
3293 struct rb_node **new = &(root->rb_node), *parent = NULL;
3294 struct tcon_link *tlink;
3295
3296 while (*new) {
3297 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3298 parent = *new;
3299
3300 if (tlink->tl_uid > new_tlink->tl_uid)
3301 new = &((*new)->rb_left);
3302 else
3303 new = &((*new)->rb_right);
3304 }
3305
3306 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3307 rb_insert_color(&new_tlink->tl_rbnode, root);
3308 }
3309
3310 /*
3311 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3312 * current task.
3313 *
3314 * If the superblock doesn't refer to a multiuser mount, then just return
3315 * the master tcon for the mount.
3316 *
3317 * First, search the rbtree for an existing tcon for this fsuid. If one
3318 * exists, then check to see if it's pending construction. If it is then wait
3319 * for construction to complete. Once it's no longer pending, check to see if
3320 * it failed and either return an error or retry construction, depending on
3321 * the timeout.
3322 *
3323 * If one doesn't exist then insert a new tcon_link struct into the tree and
3324 * try to construct a new one.
3325 */
3326 struct tcon_link *
3327 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3328 {
3329 int ret;
3330 uid_t fsuid = current_fsuid();
3331 struct tcon_link *tlink, *newtlink;
3332
3333 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3334 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3335
3336 spin_lock(&cifs_sb->tlink_tree_lock);
3337 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3338 if (tlink)
3339 cifs_get_tlink(tlink);
3340 spin_unlock(&cifs_sb->tlink_tree_lock);
3341
3342 if (tlink == NULL) {
3343 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3344 if (newtlink == NULL)
3345 return ERR_PTR(-ENOMEM);
3346 newtlink->tl_uid = fsuid;
3347 newtlink->tl_tcon = ERR_PTR(-EACCES);
3348 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3349 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3350 cifs_get_tlink(newtlink);
3351
3352 spin_lock(&cifs_sb->tlink_tree_lock);
3353 /* was one inserted after previous search? */
3354 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3355 if (tlink) {
3356 cifs_get_tlink(tlink);
3357 spin_unlock(&cifs_sb->tlink_tree_lock);
3358 kfree(newtlink);
3359 goto wait_for_construction;
3360 }
3361 tlink = newtlink;
3362 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3363 spin_unlock(&cifs_sb->tlink_tree_lock);
3364 } else {
3365 wait_for_construction:
3366 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3367 cifs_sb_tcon_pending_wait,
3368 TASK_INTERRUPTIBLE);
3369 if (ret) {
3370 cifs_put_tlink(tlink);
3371 return ERR_PTR(ret);
3372 }
3373
3374 /* if it's good, return it */
3375 if (!IS_ERR(tlink->tl_tcon))
3376 return tlink;
3377
3378 /* return error if we tried this already recently */
3379 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3380 cifs_put_tlink(tlink);
3381 return ERR_PTR(-EACCES);
3382 }
3383
3384 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3385 goto wait_for_construction;
3386 }
3387
3388 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3389 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3390 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3391
3392 if (IS_ERR(tlink->tl_tcon)) {
3393 cifs_put_tlink(tlink);
3394 return ERR_PTR(-EACCES);
3395 }
3396
3397 return tlink;
3398 }
3399
3400 /*
3401 * periodic workqueue job that scans tcon_tree for a superblock and closes
3402 * out tcons.
3403 */
3404 static void
3405 cifs_prune_tlinks(struct work_struct *work)
3406 {
3407 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3408 prune_tlinks.work);
3409 struct rb_root *root = &cifs_sb->tlink_tree;
3410 struct rb_node *node = rb_first(root);
3411 struct rb_node *tmp;
3412 struct tcon_link *tlink;
3413
3414 /*
3415 * Because we drop the spinlock in the loop in order to put the tlink
3416 * it's not guarded against removal of links from the tree. The only
3417 * places that remove entries from the tree are this function and
3418 * umounts. Because this function is non-reentrant and is canceled
3419 * before umount can proceed, this is safe.
3420 */
3421 spin_lock(&cifs_sb->tlink_tree_lock);
3422 node = rb_first(root);
3423 while (node != NULL) {
3424 tmp = node;
3425 node = rb_next(tmp);
3426 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3427
3428 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3429 atomic_read(&tlink->tl_count) != 0 ||
3430 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3431 continue;
3432
3433 cifs_get_tlink(tlink);
3434 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3435 rb_erase(tmp, root);
3436
3437 spin_unlock(&cifs_sb->tlink_tree_lock);
3438 cifs_put_tlink(tlink);
3439 spin_lock(&cifs_sb->tlink_tree_lock);
3440 }
3441 spin_unlock(&cifs_sb->tlink_tree_lock);
3442
3443 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3444 TLINK_IDLE_EXPIRE);
3445 }
Linux kernel - Deliverables
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