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mm: fix race between mremap and removing migration entry
[linux-btrfs-devel.git] / fs / cifs / connect.c
blob71beb02019709933015a14449a4dcb37e959e12d
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 /* FIXME: should these be tunable? */
61 #define TLINK_ERROR_EXPIRE (1 * HZ)
62 #define TLINK_IDLE_EXPIRE (600 * HZ)
63
64 static int ip_connect(struct TCP_Server_Info *server);
65 static int generic_ip_connect(struct TCP_Server_Info *server);
66 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
67 static void cifs_prune_tlinks(struct work_struct *work);
68 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
69 const char *devname);
70
71 /*
72 * cifs tcp session reconnection
73 *
74 * mark tcp session as reconnecting so temporarily locked
75 * mark all smb sessions as reconnecting for tcp session
76 * reconnect tcp session
77 * wake up waiters on reconnection? - (not needed currently)
78 */
79 static int
80 cifs_reconnect(struct TCP_Server_Info *server)
81 {
82 int rc = 0;
83 struct list_head *tmp, *tmp2;
84 struct cifs_ses *ses;
85 struct cifs_tcon *tcon;
86 struct mid_q_entry *mid_entry;
87 struct list_head retry_list;
88
89 spin_lock(&GlobalMid_Lock);
90 if (server->tcpStatus == CifsExiting) {
91 /* the demux thread will exit normally
92 next time through the loop */
93 spin_unlock(&GlobalMid_Lock);
94 return rc;
95 } else
96 server->tcpStatus = CifsNeedReconnect;
97 spin_unlock(&GlobalMid_Lock);
98 server->maxBuf = 0;
99
100 cFYI(1, "Reconnecting tcp session");
101
102 /* before reconnecting the tcp session, mark the smb session (uid)
103 and the tid bad so they are not used until reconnected */
104 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
105 spin_lock(&cifs_tcp_ses_lock);
106 list_for_each(tmp, &server->smb_ses_list) {
107 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
108 ses->need_reconnect = true;
109 ses->ipc_tid = 0;
110 list_for_each(tmp2, &ses->tcon_list) {
111 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
112 tcon->need_reconnect = true;
113 }
114 }
115 spin_unlock(&cifs_tcp_ses_lock);
116
117 /* do not want to be sending data on a socket we are freeing */
118 cFYI(1, "%s: tearing down socket", __func__);
119 mutex_lock(&server->srv_mutex);
120 if (server->ssocket) {
121 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
122 server->ssocket->flags);
123 kernel_sock_shutdown(server->ssocket, SHUT_WR);
124 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
125 server->ssocket->state,
126 server->ssocket->flags);
127 sock_release(server->ssocket);
128 server->ssocket = NULL;
129 }
130 server->sequence_number = 0;
131 server->session_estab = false;
132 kfree(server->session_key.response);
133 server->session_key.response = NULL;
134 server->session_key.len = 0;
135 server->lstrp = jiffies;
136 mutex_unlock(&server->srv_mutex);
137
138 /* mark submitted MIDs for retry and issue callback */
139 INIT_LIST_HEAD(&retry_list);
140 cFYI(1, "%s: moving mids to private list", __func__);
141 spin_lock(&GlobalMid_Lock);
142 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
143 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
144 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
145 mid_entry->midState = MID_RETRY_NEEDED;
146 list_move(&mid_entry->qhead, &retry_list);
147 }
148 spin_unlock(&GlobalMid_Lock);
149
150 cFYI(1, "%s: issuing mid callbacks", __func__);
151 list_for_each_safe(tmp, tmp2, &retry_list) {
152 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
153 list_del_init(&mid_entry->qhead);
154 mid_entry->callback(mid_entry);
155 }
156
157 do {
158 try_to_freeze();
159
160 /* we should try only the port we connected to before */
161 rc = generic_ip_connect(server);
162 if (rc) {
163 cFYI(1, "reconnect error %d", rc);
164 msleep(3000);
165 } else {
166 atomic_inc(&tcpSesReconnectCount);
167 spin_lock(&GlobalMid_Lock);
168 if (server->tcpStatus != CifsExiting)
169 server->tcpStatus = CifsNeedNegotiate;
170 spin_unlock(&GlobalMid_Lock);
171 }
172 } while (server->tcpStatus == CifsNeedReconnect);
173
174 return rc;
175 }
176
177 /*
178 return codes:
179 0 not a transact2, or all data present
180 >0 transact2 with that much data missing
181 -EINVAL = invalid transact2
182
183 */
184 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
185 {
186 struct smb_t2_rsp *pSMBt;
187 int remaining;
188 __u16 total_data_size, data_in_this_rsp;
189
190 if (pSMB->Command != SMB_COM_TRANSACTION2)
191 return 0;
192
193 /* check for plausible wct, bcc and t2 data and parm sizes */
194 /* check for parm and data offset going beyond end of smb */
195 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
196 cFYI(1, "invalid transact2 word count");
197 return -EINVAL;
198 }
199
200 pSMBt = (struct smb_t2_rsp *)pSMB;
201
202 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
203 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
204
205 if (total_data_size == data_in_this_rsp)
206 return 0;
207 else if (total_data_size < data_in_this_rsp) {
208 cFYI(1, "total data %d smaller than data in frame %d",
209 total_data_size, data_in_this_rsp);
210 return -EINVAL;
211 }
212
213 remaining = total_data_size - data_in_this_rsp;
214
215 cFYI(1, "missing %d bytes from transact2, check next response",
216 remaining);
217 if (total_data_size > maxBufSize) {
218 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
219 total_data_size, maxBufSize);
220 return -EINVAL;
221 }
222 return remaining;
223 }
224
225 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
226 {
227 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
228 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
229 char *data_area_of_target;
230 char *data_area_of_buf2;
231 int remaining;
232 unsigned int byte_count, total_in_buf;
233 __u16 total_data_size, total_in_buf2;
234
235 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
236
237 if (total_data_size !=
238 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
239 cFYI(1, "total data size of primary and secondary t2 differ");
240
241 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
242
243 remaining = total_data_size - total_in_buf;
244
245 if (remaining < 0)
246 return -EPROTO;
247
248 if (remaining == 0) /* nothing to do, ignore */
249 return 0;
250
251 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
252 if (remaining < total_in_buf2) {
253 cFYI(1, "transact2 2nd response contains too much data");
254 }
255
256 /* find end of first SMB data area */
257 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
258 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
259 /* validate target area */
260
261 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
262 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
263
264 data_area_of_target += total_in_buf;
265
266 /* copy second buffer into end of first buffer */
267 total_in_buf += total_in_buf2;
268 /* is the result too big for the field? */
269 if (total_in_buf > USHRT_MAX)
270 return -EPROTO;
271 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
272
273 /* fix up the BCC */
274 byte_count = get_bcc(pTargetSMB);
275 byte_count += total_in_buf2;
276 /* is the result too big for the field? */
277 if (byte_count > USHRT_MAX)
278 return -EPROTO;
279 put_bcc(byte_count, pTargetSMB);
280
281 byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
282 byte_count += total_in_buf2;
283 /* don't allow buffer to overflow */
284 if (byte_count > CIFSMaxBufSize)
285 return -ENOBUFS;
286 pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
287
288 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
289
290 if (remaining == total_in_buf2) {
291 cFYI(1, "found the last secondary response");
292 return 0; /* we are done */
293 } else /* more responses to go */
294 return 1;
295 }
296
297 static void
298 cifs_echo_request(struct work_struct *work)
299 {
300 int rc;
301 struct TCP_Server_Info *server = container_of(work,
302 struct TCP_Server_Info, echo.work);
303
304 /*
305 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
306 * done, which is indicated by maxBuf != 0. Also, no need to ping if
307 * we got a response recently
308 */
309 if (server->maxBuf == 0 ||
310 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
311 goto requeue_echo;
312
313 rc = CIFSSMBEcho(server);
314 if (rc)
315 cFYI(1, "Unable to send echo request to server: %s",
316 server->hostname);
317
318 requeue_echo:
319 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
320 }
321
322 static bool
323 allocate_buffers(char **bigbuf, char **smallbuf, unsigned int size,
324 bool is_large_buf)
325 {
326 char *bbuf = *bigbuf, *sbuf = *smallbuf;
327
328 if (bbuf == NULL) {
329 bbuf = (char *)cifs_buf_get();
330 if (!bbuf) {
331 cERROR(1, "No memory for large SMB response");
332 msleep(3000);
333 /* retry will check if exiting */
334 return false;
335 }
336 } else if (is_large_buf) {
337 /* we are reusing a dirty large buf, clear its start */
338 memset(bbuf, 0, size);
339 }
340
341 if (sbuf == NULL) {
342 sbuf = (char *)cifs_small_buf_get();
343 if (!sbuf) {
344 cERROR(1, "No memory for SMB response");
345 msleep(1000);
346 /* retry will check if exiting */
347 return false;
348 }
349 /* beginning of smb buffer is cleared in our buf_get */
350 } else {
351 /* if existing small buf clear beginning */
352 memset(sbuf, 0, size);
353 }
354
355 *bigbuf = bbuf;
356 *smallbuf = sbuf;
357
358 return true;
359 }
360
361 static int
362 read_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg,
363 struct kvec *iov, unsigned int to_read,
364 unsigned int *ptotal_read, bool is_header_read)
365 {
366 int length, rc = 0;
367 unsigned int total_read;
368 char *buf = iov->iov_base;
369
370 for (total_read = 0; total_read < to_read; total_read += length) {
371 length = kernel_recvmsg(server->ssocket, smb_msg, iov, 1,
372 to_read - total_read, 0);
373 if (server->tcpStatus == CifsExiting) {
374 /* then will exit */
375 rc = 2;
376 break;
377 } else if (server->tcpStatus == CifsNeedReconnect) {
378 cifs_reconnect(server);
379 /* Reconnect wakes up rspns q */
380 /* Now we will reread sock */
381 rc = 1;
382 break;
383 } else if (length == -ERESTARTSYS ||
384 length == -EAGAIN ||
385 length == -EINTR) {
386 /*
387 * Minimum sleep to prevent looping, allowing socket
388 * to clear and app threads to set tcpStatus
389 * CifsNeedReconnect if server hung.
390 */
391 usleep_range(1000, 2000);
392 length = 0;
393 if (!is_header_read)
394 continue;
395 /* Special handling for header read */
396 if (total_read) {
397 iov->iov_base = (to_read - total_read) +
398 buf;
399 iov->iov_len = to_read - total_read;
400 smb_msg->msg_control = NULL;
401 smb_msg->msg_controllen = 0;
402 rc = 3;
403 } else
404 rc = 1;
405 break;
406 } else if (length <= 0) {
407 cERROR(1, "Received no data, expecting %d",
408 to_read - total_read);
409 cifs_reconnect(server);
410 rc = 1;
411 break;
412 }
413 }
414
415 *ptotal_read = total_read;
416 return rc;
417 }
418
419 static bool
420 check_rfc1002_header(struct TCP_Server_Info *server, char *buf)
421 {
422 char temp = *buf;
423 unsigned int pdu_length = be32_to_cpu(
424 ((struct smb_hdr *)buf)->smb_buf_length);
425
426 /*
427 * The first byte big endian of the length field,
428 * is actually not part of the length but the type
429 * with the most common, zero, as regular data.
430 */
431 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
432 return false;
433 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
434 cFYI(1, "Good RFC 1002 session rsp");
435 return false;
436 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
437 /*
438 * We get this from Windows 98 instead of an error on
439 * SMB negprot response.
440 */
441 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
442 pdu_length);
443 /* give server a second to clean up */
444 msleep(1000);
445 /*
446 * Always try 445 first on reconnect since we get NACK
447 * on some if we ever connected to port 139 (the NACK
448 * is since we do not begin with RFC1001 session
449 * initialize frame).
450 */
451 cifs_set_port((struct sockaddr *)
452 &server->dstaddr, CIFS_PORT);
453 cifs_reconnect(server);
454 wake_up(&server->response_q);
455 return false;
456 } else if (temp != (char) 0) {
457 cERROR(1, "Unknown RFC 1002 frame");
458 cifs_dump_mem(" Received Data: ", buf, 4);
459 cifs_reconnect(server);
460 return false;
461 }
462
463 /* else we have an SMB response */
464 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
465 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
466 cERROR(1, "Invalid size SMB length %d pdu_length %d",
467 4, pdu_length+4);
468 cifs_reconnect(server);
469 wake_up(&server->response_q);
470 return false;
471 }
472
473 return true;
474 }
475
476 static struct mid_q_entry *
477 find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
478 int *length, bool is_large_buf, bool *is_multi_rsp, char **bigbuf)
479 {
480 struct mid_q_entry *mid = NULL, *tmp_mid, *ret = NULL;
481
482 spin_lock(&GlobalMid_Lock);
483 list_for_each_entry_safe(mid, tmp_mid, &server->pending_mid_q, qhead) {
484 if (mid->mid != buf->Mid ||
485 mid->midState != MID_REQUEST_SUBMITTED ||
486 mid->command != buf->Command)
487 continue;
488
489 if (*length == 0 && check2ndT2(buf, server->maxBuf) > 0) {
490 /* We have a multipart transact2 resp */
491 *is_multi_rsp = true;
492 if (mid->resp_buf) {
493 /* merge response - fix up 1st*/
494 *length = coalesce_t2(buf, mid->resp_buf);
495 if (*length > 0) {
496 *length = 0;
497 mid->multiRsp = true;
498 break;
499 }
500 /* All parts received or packet is malformed. */
501 mid->multiEnd = true;
502 goto multi_t2_fnd;
503 }
504 if (!is_large_buf) {
505 /*FIXME: switch to already allocated largebuf?*/
506 cERROR(1, "1st trans2 resp needs bigbuf");
507 } else {
508 /* Have first buffer */
509 mid->resp_buf = buf;
510 mid->largeBuf = true;
511 *bigbuf = NULL;
512 }
513 break;
514 }
515 mid->resp_buf = buf;
516 mid->largeBuf = is_large_buf;
517 multi_t2_fnd:
518 if (*length == 0)
519 mid->midState = MID_RESPONSE_RECEIVED;
520 else
521 mid->midState = MID_RESPONSE_MALFORMED;
522 #ifdef CONFIG_CIFS_STATS2
523 mid->when_received = jiffies;
524 #endif
525 list_del_init(&mid->qhead);
526 ret = mid;
527 break;
528 }
529 spin_unlock(&GlobalMid_Lock);
530
531 return ret;
532 }
533
534 static void clean_demultiplex_info(struct TCP_Server_Info *server)
535 {
536 int length;
537
538 /* take it off the list, if it's not already */
539 spin_lock(&cifs_tcp_ses_lock);
540 list_del_init(&server->tcp_ses_list);
541 spin_unlock(&cifs_tcp_ses_lock);
542
543 spin_lock(&GlobalMid_Lock);
544 server->tcpStatus = CifsExiting;
545 spin_unlock(&GlobalMid_Lock);
546 wake_up_all(&server->response_q);
547
548 /*
549 * Check if we have blocked requests that need to free. Note that
550 * cifs_max_pending is normally 50, but can be set at module install
551 * time to as little as two.
552 */
553 spin_lock(&GlobalMid_Lock);
554 if (atomic_read(&server->inFlight) >= cifs_max_pending)
555 atomic_set(&server->inFlight, cifs_max_pending - 1);
556 /*
557 * We do not want to set the max_pending too low or we could end up
558 * with the counter going negative.
559 */
560 spin_unlock(&GlobalMid_Lock);
561 /*
562 * Although there should not be any requests blocked on this queue it
563 * can not hurt to be paranoid and try to wake up requests that may
564 * haven been blocked when more than 50 at time were on the wire to the
565 * same server - they now will see the session is in exit state and get
566 * out of SendReceive.
567 */
568 wake_up_all(&server->request_q);
569 /* give those requests time to exit */
570 msleep(125);
571
572 if (server->ssocket) {
573 sock_release(server->ssocket);
574 server->ssocket = NULL;
575 }
576
577 if (!list_empty(&server->pending_mid_q)) {
578 struct list_head dispose_list;
579 struct mid_q_entry *mid_entry;
580 struct list_head *tmp, *tmp2;
581
582 INIT_LIST_HEAD(&dispose_list);
583 spin_lock(&GlobalMid_Lock);
584 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
585 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
586 cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
587 mid_entry->midState = MID_SHUTDOWN;
588 list_move(&mid_entry->qhead, &dispose_list);
589 }
590 spin_unlock(&GlobalMid_Lock);
591
592 /* now walk dispose list and issue callbacks */
593 list_for_each_safe(tmp, tmp2, &dispose_list) {
594 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
595 cFYI(1, "Callback mid 0x%x", mid_entry->mid);
596 list_del_init(&mid_entry->qhead);
597 mid_entry->callback(mid_entry);
598 }
599 /* 1/8th of sec is more than enough time for them to exit */
600 msleep(125);
601 }
602
603 if (!list_empty(&server->pending_mid_q)) {
604 /*
605 * mpx threads have not exited yet give them at least the smb
606 * send timeout time for long ops.
607 *
608 * Due to delays on oplock break requests, we need to wait at
609 * least 45 seconds before giving up on a request getting a
610 * response and going ahead and killing cifsd.
611 */
612 cFYI(1, "Wait for exit from demultiplex thread");
613 msleep(46000);
614 /*
615 * If threads still have not exited they are probably never
616 * coming home not much else we can do but free the memory.
617 */
618 }
619
620 kfree(server->hostname);
621 kfree(server);
622
623 length = atomic_dec_return(&tcpSesAllocCount);
624 if (length > 0)
625 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
626 GFP_KERNEL);
627 }
628
629 static int
630 cifs_demultiplex_thread(void *p)
631 {
632 int length;
633 struct TCP_Server_Info *server = p;
634 unsigned int pdu_length, total_read;
635 char *buf = NULL, *bigbuf = NULL, *smallbuf = NULL;
636 struct smb_hdr *smb_buffer = NULL;
637 struct msghdr smb_msg;
638 struct kvec iov;
639 struct task_struct *task_to_wake = NULL;
640 struct mid_q_entry *mid_entry;
641 bool isLargeBuf = false;
642 bool isMultiRsp = false;
643 int rc;
644
645 current->flags |= PF_MEMALLOC;
646 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
647
648 length = atomic_inc_return(&tcpSesAllocCount);
649 if (length > 1)
650 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
651 GFP_KERNEL);
652
653 set_freezable();
654 while (server->tcpStatus != CifsExiting) {
655 if (try_to_freeze())
656 continue;
657
658 if (!allocate_buffers(&bigbuf, &smallbuf,
659 sizeof(struct smb_hdr), isLargeBuf))
660 continue;
661
662 isLargeBuf = false;
663 isMultiRsp = false;
664 smb_buffer = (struct smb_hdr *)smallbuf;
665 buf = smallbuf;
666 iov.iov_base = buf;
667 iov.iov_len = 4;
668 smb_msg.msg_control = NULL;
669 smb_msg.msg_controllen = 0;
670 pdu_length = 4; /* enough to get RFC1001 header */
671
672 incomplete_rcv:
673 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
674 time_after(jiffies, server->lstrp +
675 (echo_retries * SMB_ECHO_INTERVAL))) {
676 cERROR(1, "Server %s has not responded in %d seconds. "
677 "Reconnecting...", server->hostname,
678 (echo_retries * SMB_ECHO_INTERVAL / HZ));
679 cifs_reconnect(server);
680 wake_up(&server->response_q);
681 continue;
682 }
683
684 rc = read_from_socket(server, &smb_msg, &iov, pdu_length,
685 &total_read, true /* header read */);
686 if (rc == 3)
687 goto incomplete_rcv;
688 else if (rc == 2)
689 break;
690 else if (rc == 1)
691 continue;
692
693 /*
694 * The right amount was read from socket - 4 bytes,
695 * so we can now interpret the length field.
696 */
697
698 /*
699 * Note that RFC 1001 length is big endian on the wire,
700 * but we convert it here so it is always manipulated
701 * as host byte order.
702 */
703 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
704
705 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
706 if (!check_rfc1002_header(server, buf))
707 continue;
708
709 /* else length ok */
710 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
711 isLargeBuf = true;
712 memcpy(bigbuf, smallbuf, 4);
713 smb_buffer = (struct smb_hdr *)bigbuf;
714 buf = bigbuf;
715 }
716
717 iov.iov_base = 4 + buf;
718 iov.iov_len = pdu_length;
719 rc = read_from_socket(server, &smb_msg, &iov, pdu_length,
720 &total_read, false);
721 if (rc == 2)
722 break;
723 else if (rc == 1)
724 continue;
725
726 total_read += 4; /* account for rfc1002 hdr */
727
728 dump_smb(smb_buffer, total_read);
729
730 /*
731 * We know that we received enough to get to the MID as we
732 * checked the pdu_length earlier. Now check to see
733 * if the rest of the header is OK. We borrow the length
734 * var for the rest of the loop to avoid a new stack var.
735 *
736 * 48 bytes is enough to display the header and a little bit
737 * into the payload for debugging purposes.
738 */
739 length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
740 if (length != 0)
741 cifs_dump_mem("Bad SMB: ", buf,
742 min_t(unsigned int, total_read, 48));
743
744 server->lstrp = jiffies;
745
746 mid_entry = find_cifs_mid(server, smb_buffer, &length,
747 isLargeBuf, &isMultiRsp, &bigbuf);
748 if (mid_entry != NULL) {
749 mid_entry->callback(mid_entry);
750 /* Was previous buf put in mpx struct for multi-rsp? */
751 if (!isMultiRsp) {
752 /* smb buffer will be freed by user thread */
753 if (isLargeBuf)
754 bigbuf = NULL;
755 else
756 smallbuf = NULL;
757 }
758 } else if (length != 0) {
759 /* response sanity checks failed */
760 continue;
761 } else if (!is_valid_oplock_break(smb_buffer, server) &&
762 !isMultiRsp) {
763 cERROR(1, "No task to wake, unknown frame received! "
764 "NumMids %d", atomic_read(&midCount));
765 cifs_dump_mem("Received Data is: ", buf,
766 sizeof(struct smb_hdr));
767 #ifdef CONFIG_CIFS_DEBUG2
768 cifs_dump_detail(smb_buffer);
769 cifs_dump_mids(server);
770 #endif /* CIFS_DEBUG2 */
771
772 }
773 } /* end while !EXITING */
774
775 /* buffer usually freed in free_mid - need to free it here on exit */
776 cifs_buf_release(bigbuf);
777 if (smallbuf) /* no sense logging a debug message if NULL */
778 cifs_small_buf_release(smallbuf);
779
780 task_to_wake = xchg(&server->tsk, NULL);
781 clean_demultiplex_info(server);
782
783 /* if server->tsk was NULL then wait for a signal before exiting */
784 if (!task_to_wake) {
785 set_current_state(TASK_INTERRUPTIBLE);
786 while (!signal_pending(current)) {
787 schedule();
788 set_current_state(TASK_INTERRUPTIBLE);
789 }
790 set_current_state(TASK_RUNNING);
791 }
792
793 module_put_and_exit(0);
794 }
795
796 /* extract the host portion of the UNC string */
797 static char *
798 extract_hostname(const char *unc)
799 {
800 const char *src;
801 char *dst, *delim;
802 unsigned int len;
803
804 /* skip double chars at beginning of string */
805 /* BB: check validity of these bytes? */
806 src = unc + 2;
807
808 /* delimiter between hostname and sharename is always '\\' now */
809 delim = strchr(src, '\\');
810 if (!delim)
811 return ERR_PTR(-EINVAL);
812
813 len = delim - src;
814 dst = kmalloc((len + 1), GFP_KERNEL);
815 if (dst == NULL)
816 return ERR_PTR(-ENOMEM);
817
818 memcpy(dst, src, len);
819 dst[len] = '\0';
820
821 return dst;
822 }
823
824 static int
825 cifs_parse_mount_options(const char *mountdata, const char *devname,
826 struct smb_vol *vol)
827 {
828 char *value, *data, *end;
829 char *mountdata_copy = NULL, *options;
830 unsigned int temp_len, i, j;
831 char separator[2];
832 short int override_uid = -1;
833 short int override_gid = -1;
834 bool uid_specified = false;
835 bool gid_specified = false;
836 char *nodename = utsname()->nodename;
837
838 separator[0] = ',';
839 separator[1] = 0;
840
841 /*
842 * does not have to be perfect mapping since field is
843 * informational, only used for servers that do not support
844 * port 445 and it can be overridden at mount time
845 */
846 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
847 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
848 vol->source_rfc1001_name[i] = toupper(nodename[i]);
849
850 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
851 /* null target name indicates to use *SMBSERVR default called name
852 if we end up sending RFC1001 session initialize */
853 vol->target_rfc1001_name[0] = 0;
854 vol->cred_uid = current_uid();
855 vol->linux_uid = current_uid();
856 vol->linux_gid = current_gid();
857
858 /* default to only allowing write access to owner of the mount */
859 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
860
861 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
862 /* default is always to request posix paths. */
863 vol->posix_paths = 1;
864 /* default to using server inode numbers where available */
865 vol->server_ino = 1;
866
867 vol->actimeo = CIFS_DEF_ACTIMEO;
868
869 if (!mountdata)
870 goto cifs_parse_mount_err;
871
872 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
873 if (!mountdata_copy)
874 goto cifs_parse_mount_err;
875
876 options = mountdata_copy;
877 end = options + strlen(options);
878 if (strncmp(options, "sep=", 4) == 0) {
879 if (options[4] != 0) {
880 separator[0] = options[4];
881 options += 5;
882 } else {
883 cFYI(1, "Null separator not allowed");
884 }
885 }
886
887 while ((data = strsep(&options, separator)) != NULL) {
888 if (!*data)
889 continue;
890 if ((value = strchr(data, '=')) != NULL)
891 *value++ = '\0';
892
893 /* Have to parse this before we parse for "user" */
894 if (strnicmp(data, "user_xattr", 10) == 0) {
895 vol->no_xattr = 0;
896 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
897 vol->no_xattr = 1;
898 } else if (strnicmp(data, "user", 4) == 0) {
899 if (!value) {
900 printk(KERN_WARNING
901 "CIFS: invalid or missing username\n");
902 goto cifs_parse_mount_err;
903 } else if (!*value) {
904 /* null user, ie anonymous, authentication */
905 vol->nullauth = 1;
906 }
907 if (strnlen(value, MAX_USERNAME_SIZE) <
908 MAX_USERNAME_SIZE) {
909 vol->username = kstrdup(value, GFP_KERNEL);
910 if (!vol->username) {
911 printk(KERN_WARNING "CIFS: no memory "
912 "for username\n");
913 goto cifs_parse_mount_err;
914 }
915 } else {
916 printk(KERN_WARNING "CIFS: username too long\n");
917 goto cifs_parse_mount_err;
918 }
919 } else if (strnicmp(data, "pass", 4) == 0) {
920 if (!value) {
921 vol->password = NULL;
922 continue;
923 } else if (value[0] == 0) {
924 /* check if string begins with double comma
925 since that would mean the password really
926 does start with a comma, and would not
927 indicate an empty string */
928 if (value[1] != separator[0]) {
929 vol->password = NULL;
930 continue;
931 }
932 }
933 temp_len = strlen(value);
934 /* removed password length check, NTLM passwords
935 can be arbitrarily long */
936
937 /* if comma in password, the string will be
938 prematurely null terminated. Commas in password are
939 specified across the cifs mount interface by a double
940 comma ie ,, and a comma used as in other cases ie ','
941 as a parameter delimiter/separator is single and due
942 to the strsep above is temporarily zeroed. */
943
944 /* NB: password legally can have multiple commas and
945 the only illegal character in a password is null */
946
947 if ((value[temp_len] == 0) &&
948 (value + temp_len < end) &&
949 (value[temp_len+1] == separator[0])) {
950 /* reinsert comma */
951 value[temp_len] = separator[0];
952 temp_len += 2; /* move after second comma */
953 while (value[temp_len] != 0) {
954 if (value[temp_len] == separator[0]) {
955 if (value[temp_len+1] ==
956 separator[0]) {
957 /* skip second comma */
958 temp_len++;
959 } else {
960 /* single comma indicating start
961 of next parm */
962 break;
963 }
964 }
965 temp_len++;
966 }
967 if (value[temp_len] == 0) {
968 options = NULL;
969 } else {
970 value[temp_len] = 0;
971 /* point option to start of next parm */
972 options = value + temp_len + 1;
973 }
974 /* go from value to value + temp_len condensing
975 double commas to singles. Note that this ends up
976 allocating a few bytes too many, which is ok */
977 vol->password = kzalloc(temp_len, GFP_KERNEL);
978 if (vol->password == NULL) {
979 printk(KERN_WARNING "CIFS: no memory "
980 "for password\n");
981 goto cifs_parse_mount_err;
982 }
983 for (i = 0, j = 0; i < temp_len; i++, j++) {
984 vol->password[j] = value[i];
985 if (value[i] == separator[0]
986 && value[i+1] == separator[0]) {
987 /* skip second comma */
988 i++;
989 }
990 }
991 vol->password[j] = 0;
992 } else {
993 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
994 if (vol->password == NULL) {
995 printk(KERN_WARNING "CIFS: no memory "
996 "for password\n");
997 goto cifs_parse_mount_err;
998 }
999 strcpy(vol->password, value);
1000 }
1001 } else if (!strnicmp(data, "ip", 2) ||
1002 !strnicmp(data, "addr", 4)) {
1003 if (!value || !*value) {
1004 vol->UNCip = NULL;
1005 } else if (strnlen(value, INET6_ADDRSTRLEN) <
1006 INET6_ADDRSTRLEN) {
1007 vol->UNCip = kstrdup(value, GFP_KERNEL);
1008 if (!vol->UNCip) {
1009 printk(KERN_WARNING "CIFS: no memory "
1010 "for UNC IP\n");
1011 goto cifs_parse_mount_err;
1012 }
1013 } else {
1014 printk(KERN_WARNING "CIFS: ip address "
1015 "too long\n");
1016 goto cifs_parse_mount_err;
1017 }
1018 } else if (strnicmp(data, "sec", 3) == 0) {
1019 if (!value || !*value) {
1020 cERROR(1, "no security value specified");
1021 continue;
1022 } else if (strnicmp(value, "krb5i", 5) == 0) {
1023 vol->secFlg |= CIFSSEC_MAY_KRB5 |
1024 CIFSSEC_MUST_SIGN;
1025 } else if (strnicmp(value, "krb5p", 5) == 0) {
1026 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
1027 CIFSSEC_MAY_KRB5; */
1028 cERROR(1, "Krb5 cifs privacy not supported");
1029 goto cifs_parse_mount_err;
1030 } else if (strnicmp(value, "krb5", 4) == 0) {
1031 vol->secFlg |= CIFSSEC_MAY_KRB5;
1032 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
1033 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
1034 CIFSSEC_MUST_SIGN;
1035 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
1036 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1037 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
1038 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1039 CIFSSEC_MUST_SIGN;
1040 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1041 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1042 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1043 vol->secFlg |= CIFSSEC_MAY_NTLM |
1044 CIFSSEC_MUST_SIGN;
1045 } else if (strnicmp(value, "ntlm", 4) == 0) {
1046 /* ntlm is default so can be turned off too */
1047 vol->secFlg |= CIFSSEC_MAY_NTLM;
1048 } else if (strnicmp(value, "nontlm", 6) == 0) {
1049 /* BB is there a better way to do this? */
1050 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1051 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1052 } else if (strnicmp(value, "lanman", 6) == 0) {
1053 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1054 #endif
1055 } else if (strnicmp(value, "none", 4) == 0) {
1056 vol->nullauth = 1;
1057 } else {
1058 cERROR(1, "bad security option: %s", value);
1059 goto cifs_parse_mount_err;
1060 }
1061 } else if (strnicmp(data, "vers", 3) == 0) {
1062 if (!value || !*value) {
1063 cERROR(1, "no protocol version specified"
1064 " after vers= mount option");
1065 } else if ((strnicmp(value, "cifs", 4) == 0) ||
1066 (strnicmp(value, "1", 1) == 0)) {
1067 /* this is the default */
1068 continue;
1069 }
1070 } else if ((strnicmp(data, "unc", 3) == 0)
1071 || (strnicmp(data, "target", 6) == 0)
1072 || (strnicmp(data, "path", 4) == 0)) {
1073 if (!value || !*value) {
1074 printk(KERN_WARNING "CIFS: invalid path to "
1075 "network resource\n");
1076 goto cifs_parse_mount_err;
1077 }
1078 if ((temp_len = strnlen(value, 300)) < 300) {
1079 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1080 if (vol->UNC == NULL)
1081 goto cifs_parse_mount_err;
1082 strcpy(vol->UNC, value);
1083 if (strncmp(vol->UNC, "//", 2) == 0) {
1084 vol->UNC[0] = '\\';
1085 vol->UNC[1] = '\\';
1086 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1087 printk(KERN_WARNING
1088 "CIFS: UNC Path does not begin "
1089 "with // or \\\\ \n");
1090 goto cifs_parse_mount_err;
1091 }
1092 } else {
1093 printk(KERN_WARNING "CIFS: UNC name too long\n");
1094 goto cifs_parse_mount_err;
1095 }
1096 } else if ((strnicmp(data, "domain", 3) == 0)
1097 || (strnicmp(data, "workgroup", 5) == 0)) {
1098 if (!value || !*value) {
1099 printk(KERN_WARNING "CIFS: invalid domain name\n");
1100 goto cifs_parse_mount_err;
1101 }
1102 /* BB are there cases in which a comma can be valid in
1103 a domain name and need special handling? */
1104 if (strnlen(value, 256) < 256) {
1105 vol->domainname = kstrdup(value, GFP_KERNEL);
1106 if (!vol->domainname) {
1107 printk(KERN_WARNING "CIFS: no memory "
1108 "for domainname\n");
1109 goto cifs_parse_mount_err;
1110 }
1111 cFYI(1, "Domain name set");
1112 } else {
1113 printk(KERN_WARNING "CIFS: domain name too "
1114 "long\n");
1115 goto cifs_parse_mount_err;
1116 }
1117 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1118 vol->srcaddr.ss_family = AF_UNSPEC;
1119
1120 if (!value || !*value) {
1121 printk(KERN_WARNING "CIFS: srcaddr value"
1122 " not specified.\n");
1123 goto cifs_parse_mount_err;
1124 }
1125 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1126 value, strlen(value));
1127 if (i == 0) {
1128 printk(KERN_WARNING "CIFS: Could not parse"
1129 " srcaddr: %s\n",
1130 value);
1131 goto cifs_parse_mount_err;
1132 }
1133 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1134 if (!value || !*value) {
1135 printk(KERN_WARNING
1136 "CIFS: invalid path prefix\n");
1137 goto cifs_parse_mount_err;
1138 }
1139 if ((temp_len = strnlen(value, 1024)) < 1024) {
1140 if (value[0] != '/')
1141 temp_len++; /* missing leading slash */
1142 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1143 if (vol->prepath == NULL)
1144 goto cifs_parse_mount_err;
1145 if (value[0] != '/') {
1146 vol->prepath[0] = '/';
1147 strcpy(vol->prepath+1, value);
1148 } else
1149 strcpy(vol->prepath, value);
1150 cFYI(1, "prefix path %s", vol->prepath);
1151 } else {
1152 printk(KERN_WARNING "CIFS: prefix too long\n");
1153 goto cifs_parse_mount_err;
1154 }
1155 } else if (strnicmp(data, "iocharset", 9) == 0) {
1156 if (!value || !*value) {
1157 printk(KERN_WARNING "CIFS: invalid iocharset "
1158 "specified\n");
1159 goto cifs_parse_mount_err;
1160 }
1161 if (strnlen(value, 65) < 65) {
1162 if (strnicmp(value, "default", 7)) {
1163 vol->iocharset = kstrdup(value,
1164 GFP_KERNEL);
1165
1166 if (!vol->iocharset) {
1167 printk(KERN_WARNING "CIFS: no "
1168 "memory for"
1169 "charset\n");
1170 goto cifs_parse_mount_err;
1171 }
1172 }
1173 /* if iocharset not set then load_nls_default
1174 is used by caller */
1175 cFYI(1, "iocharset set to %s", value);
1176 } else {
1177 printk(KERN_WARNING "CIFS: iocharset name "
1178 "too long.\n");
1179 goto cifs_parse_mount_err;
1180 }
1181 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1182 vol->linux_uid = simple_strtoul(value, &value, 0);
1183 uid_specified = true;
1184 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1185 vol->cred_uid = simple_strtoul(value, &value, 0);
1186 } else if (!strnicmp(data, "forceuid", 8)) {
1187 override_uid = 1;
1188 } else if (!strnicmp(data, "noforceuid", 10)) {
1189 override_uid = 0;
1190 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1191 vol->linux_gid = simple_strtoul(value, &value, 0);
1192 gid_specified = true;
1193 } else if (!strnicmp(data, "forcegid", 8)) {
1194 override_gid = 1;
1195 } else if (!strnicmp(data, "noforcegid", 10)) {
1196 override_gid = 0;
1197 } else if (strnicmp(data, "file_mode", 4) == 0) {
1198 if (value && *value) {
1199 vol->file_mode =
1200 simple_strtoul(value, &value, 0);
1201 }
1202 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1203 if (value && *value) {
1204 vol->dir_mode =
1205 simple_strtoul(value, &value, 0);
1206 }
1207 } else if (strnicmp(data, "dirmode", 4) == 0) {
1208 if (value && *value) {
1209 vol->dir_mode =
1210 simple_strtoul(value, &value, 0);
1211 }
1212 } else if (strnicmp(data, "port", 4) == 0) {
1213 if (value && *value) {
1214 vol->port =
1215 simple_strtoul(value, &value, 0);
1216 }
1217 } else if (strnicmp(data, "rsize", 5) == 0) {
1218 if (value && *value) {
1219 vol->rsize =
1220 simple_strtoul(value, &value, 0);
1221 }
1222 } else if (strnicmp(data, "wsize", 5) == 0) {
1223 if (value && *value) {
1224 vol->wsize =
1225 simple_strtoul(value, &value, 0);
1226 }
1227 } else if (strnicmp(data, "sockopt", 5) == 0) {
1228 if (!value || !*value) {
1229 cERROR(1, "no socket option specified");
1230 continue;
1231 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1232 vol->sockopt_tcp_nodelay = 1;
1233 }
1234 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1235 if (!value || !*value || (*value == ' ')) {
1236 cFYI(1, "invalid (empty) netbiosname");
1237 } else {
1238 memset(vol->source_rfc1001_name, 0x20,
1239 RFC1001_NAME_LEN);
1240 /*
1241 * FIXME: are there cases in which a comma can
1242 * be valid in workstation netbios name (and
1243 * need special handling)?
1244 */
1245 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1246 /* don't ucase netbiosname for user */
1247 if (value[i] == 0)
1248 break;
1249 vol->source_rfc1001_name[i] = value[i];
1250 }
1251 /* The string has 16th byte zero still from
1252 set at top of the function */
1253 if (i == RFC1001_NAME_LEN && value[i] != 0)
1254 printk(KERN_WARNING "CIFS: netbiosname"
1255 " longer than 15 truncated.\n");
1256 }
1257 } else if (strnicmp(data, "servern", 7) == 0) {
1258 /* servernetbiosname specified override *SMBSERVER */
1259 if (!value || !*value || (*value == ' ')) {
1260 cFYI(1, "empty server netbiosname specified");
1261 } else {
1262 /* last byte, type, is 0x20 for servr type */
1263 memset(vol->target_rfc1001_name, 0x20,
1264 RFC1001_NAME_LEN_WITH_NULL);
1265
1266 for (i = 0; i < 15; i++) {
1267 /* BB are there cases in which a comma can be
1268 valid in this workstation netbios name
1269 (and need special handling)? */
1270
1271 /* user or mount helper must uppercase
1272 the netbiosname */
1273 if (value[i] == 0)
1274 break;
1275 else
1276 vol->target_rfc1001_name[i] =
1277 value[i];
1278 }
1279 /* The string has 16th byte zero still from
1280 set at top of the function */
1281 if (i == RFC1001_NAME_LEN && value[i] != 0)
1282 printk(KERN_WARNING "CIFS: server net"
1283 "biosname longer than 15 truncated.\n");
1284 }
1285 } else if (strnicmp(data, "actimeo", 7) == 0) {
1286 if (value && *value) {
1287 vol->actimeo = HZ * simple_strtoul(value,
1288 &value, 0);
1289 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1290 cERROR(1, "CIFS: attribute cache"
1291 "timeout too large");
1292 goto cifs_parse_mount_err;
1293 }
1294 }
1295 } else if (strnicmp(data, "credentials", 4) == 0) {
1296 /* ignore */
1297 } else if (strnicmp(data, "version", 3) == 0) {
1298 /* ignore */
1299 } else if (strnicmp(data, "guest", 5) == 0) {
1300 /* ignore */
1301 } else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) {
1302 /* ignore */
1303 } else if (strnicmp(data, "ro", 2) == 0) {
1304 /* ignore */
1305 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1306 vol->noblocksnd = 1;
1307 } else if (strnicmp(data, "noautotune", 10) == 0) {
1308 vol->noautotune = 1;
1309 } else if ((strnicmp(data, "suid", 4) == 0) ||
1310 (strnicmp(data, "nosuid", 6) == 0) ||
1311 (strnicmp(data, "exec", 4) == 0) ||
1312 (strnicmp(data, "noexec", 6) == 0) ||
1313 (strnicmp(data, "nodev", 5) == 0) ||
1314 (strnicmp(data, "noauto", 6) == 0) ||
1315 (strnicmp(data, "dev", 3) == 0)) {
1316 /* The mount tool or mount.cifs helper (if present)
1317 uses these opts to set flags, and the flags are read
1318 by the kernel vfs layer before we get here (ie
1319 before read super) so there is no point trying to
1320 parse these options again and set anything and it
1321 is ok to just ignore them */
1322 continue;
1323 } else if (strnicmp(data, "hard", 4) == 0) {
1324 vol->retry = 1;
1325 } else if (strnicmp(data, "soft", 4) == 0) {
1326 vol->retry = 0;
1327 } else if (strnicmp(data, "perm", 4) == 0) {
1328 vol->noperm = 0;
1329 } else if (strnicmp(data, "noperm", 6) == 0) {
1330 vol->noperm = 1;
1331 } else if (strnicmp(data, "mapchars", 8) == 0) {
1332 vol->remap = 1;
1333 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1334 vol->remap = 0;
1335 } else if (strnicmp(data, "sfu", 3) == 0) {
1336 vol->sfu_emul = 1;
1337 } else if (strnicmp(data, "nosfu", 5) == 0) {
1338 vol->sfu_emul = 0;
1339 } else if (strnicmp(data, "nodfs", 5) == 0) {
1340 vol->nodfs = 1;
1341 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1342 vol->posix_paths = 1;
1343 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1344 vol->posix_paths = 0;
1345 } else if (strnicmp(data, "nounix", 6) == 0) {
1346 vol->no_linux_ext = 1;
1347 } else if (strnicmp(data, "nolinux", 7) == 0) {
1348 vol->no_linux_ext = 1;
1349 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1350 (strnicmp(data, "ignorecase", 10) == 0)) {
1351 vol->nocase = 1;
1352 } else if (strnicmp(data, "mand", 4) == 0) {
1353 /* ignore */
1354 } else if (strnicmp(data, "nomand", 6) == 0) {
1355 /* ignore */
1356 } else if (strnicmp(data, "_netdev", 7) == 0) {
1357 /* ignore */
1358 } else if (strnicmp(data, "brl", 3) == 0) {
1359 vol->nobrl = 0;
1360 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1361 (strnicmp(data, "nolock", 6) == 0)) {
1362 vol->nobrl = 1;
1363 /* turn off mandatory locking in mode
1364 if remote locking is turned off since the
1365 local vfs will do advisory */
1366 if (vol->file_mode ==
1367 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1368 vol->file_mode = S_IALLUGO;
1369 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1370 /* will take the shorter form "forcemand" as well */
1371 /* This mount option will force use of mandatory
1372 (DOS/Windows style) byte range locks, instead of
1373 using posix advisory byte range locks, even if the
1374 Unix extensions are available and posix locks would
1375 be supported otherwise. If Unix extensions are not
1376 negotiated this has no effect since mandatory locks
1377 would be used (mandatory locks is all that those
1378 those servers support) */
1379 vol->mand_lock = 1;
1380 } else if (strnicmp(data, "setuids", 7) == 0) {
1381 vol->setuids = 1;
1382 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1383 vol->setuids = 0;
1384 } else if (strnicmp(data, "dynperm", 7) == 0) {
1385 vol->dynperm = true;
1386 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1387 vol->dynperm = false;
1388 } else if (strnicmp(data, "nohard", 6) == 0) {
1389 vol->retry = 0;
1390 } else if (strnicmp(data, "nosoft", 6) == 0) {
1391 vol->retry = 1;
1392 } else if (strnicmp(data, "nointr", 6) == 0) {
1393 vol->intr = 0;
1394 } else if (strnicmp(data, "intr", 4) == 0) {
1395 vol->intr = 1;
1396 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1397 vol->nostrictsync = 1;
1398 } else if (strnicmp(data, "strictsync", 10) == 0) {
1399 vol->nostrictsync = 0;
1400 } else if (strnicmp(data, "serverino", 7) == 0) {
1401 vol->server_ino = 1;
1402 } else if (strnicmp(data, "noserverino", 9) == 0) {
1403 vol->server_ino = 0;
1404 } else if (strnicmp(data, "rwpidforward", 12) == 0) {
1405 vol->rwpidforward = 1;
1406 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1407 vol->cifs_acl = 1;
1408 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1409 vol->cifs_acl = 0;
1410 } else if (strnicmp(data, "acl", 3) == 0) {
1411 vol->no_psx_acl = 0;
1412 } else if (strnicmp(data, "noacl", 5) == 0) {
1413 vol->no_psx_acl = 1;
1414 } else if (strnicmp(data, "locallease", 6) == 0) {
1415 vol->local_lease = 1;
1416 } else if (strnicmp(data, "sign", 4) == 0) {
1417 vol->secFlg |= CIFSSEC_MUST_SIGN;
1418 } else if (strnicmp(data, "seal", 4) == 0) {
1419 /* we do not do the following in secFlags because seal
1420 is a per tree connection (mount) not a per socket
1421 or per-smb connection option in the protocol */
1422 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1423 vol->seal = 1;
1424 } else if (strnicmp(data, "direct", 6) == 0) {
1425 vol->direct_io = 1;
1426 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1427 vol->direct_io = 1;
1428 } else if (strnicmp(data, "strictcache", 11) == 0) {
1429 vol->strict_io = 1;
1430 } else if (strnicmp(data, "noac", 4) == 0) {
1431 printk(KERN_WARNING "CIFS: Mount option noac not "
1432 "supported. Instead set "
1433 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1434 } else if (strnicmp(data, "fsc", 3) == 0) {
1435 #ifndef CONFIG_CIFS_FSCACHE
1436 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1437 "kernel config option set");
1438 goto cifs_parse_mount_err;
1439 #endif
1440 vol->fsc = true;
1441 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1442 vol->mfsymlinks = true;
1443 } else if (strnicmp(data, "multiuser", 8) == 0) {
1444 vol->multiuser = true;
1445 } else
1446 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1447 data);
1448 }
1449 if (vol->UNC == NULL) {
1450 if (devname == NULL) {
1451 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1452 "target\n");
1453 goto cifs_parse_mount_err;
1454 }
1455 if ((temp_len = strnlen(devname, 300)) < 300) {
1456 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1457 if (vol->UNC == NULL)
1458 goto cifs_parse_mount_err;
1459 strcpy(vol->UNC, devname);
1460 if (strncmp(vol->UNC, "//", 2) == 0) {
1461 vol->UNC[0] = '\\';
1462 vol->UNC[1] = '\\';
1463 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1464 printk(KERN_WARNING "CIFS: UNC Path does not "
1465 "begin with // or \\\\ \n");
1466 goto cifs_parse_mount_err;
1467 }
1468 value = strpbrk(vol->UNC+2, "/\\");
1469 if (value)
1470 *value = '\\';
1471 } else {
1472 printk(KERN_WARNING "CIFS: UNC name too long\n");
1473 goto cifs_parse_mount_err;
1474 }
1475 }
1476
1477 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1478 cERROR(1, "Multiuser mounts currently require krb5 "
1479 "authentication!");
1480 goto cifs_parse_mount_err;
1481 }
1482
1483 if (vol->UNCip == NULL)
1484 vol->UNCip = &vol->UNC[2];
1485
1486 if (uid_specified)
1487 vol->override_uid = override_uid;
1488 else if (override_uid == 1)
1489 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1490 "specified with no uid= option.\n");
1491
1492 if (gid_specified)
1493 vol->override_gid = override_gid;
1494 else if (override_gid == 1)
1495 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1496 "specified with no gid= option.\n");
1497
1498 kfree(mountdata_copy);
1499 return 0;
1500
1501 cifs_parse_mount_err:
1502 kfree(mountdata_copy);
1503 return 1;
1504 }
1505
1506 /** Returns true if srcaddr isn't specified and rhs isn't
1507 * specified, or if srcaddr is specified and
1508 * matches the IP address of the rhs argument.
1509 */
1510 static bool
1511 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1512 {
1513 switch (srcaddr->sa_family) {
1514 case AF_UNSPEC:
1515 return (rhs->sa_family == AF_UNSPEC);
1516 case AF_INET: {
1517 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1518 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1519 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1520 }
1521 case AF_INET6: {
1522 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1523 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1524 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1525 }
1526 default:
1527 WARN_ON(1);
1528 return false; /* don't expect to be here */
1529 }
1530 }
1531
1532 /*
1533 * If no port is specified in addr structure, we try to match with 445 port
1534 * and if it fails - with 139 ports. It should be called only if address
1535 * families of server and addr are equal.
1536 */
1537 static bool
1538 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1539 {
1540 __be16 port, *sport;
1541
1542 switch (addr->sa_family) {
1543 case AF_INET:
1544 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1545 port = ((struct sockaddr_in *) addr)->sin_port;
1546 break;
1547 case AF_INET6:
1548 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1549 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1550 break;
1551 default:
1552 WARN_ON(1);
1553 return false;
1554 }
1555
1556 if (!port) {
1557 port = htons(CIFS_PORT);
1558 if (port == *sport)
1559 return true;
1560
1561 port = htons(RFC1001_PORT);
1562 }
1563
1564 return port == *sport;
1565 }
1566
1567 static bool
1568 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1569 struct sockaddr *srcaddr)
1570 {
1571 switch (addr->sa_family) {
1572 case AF_INET: {
1573 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1574 struct sockaddr_in *srv_addr4 =
1575 (struct sockaddr_in *)&server->dstaddr;
1576
1577 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1578 return false;
1579 break;
1580 }
1581 case AF_INET6: {
1582 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1583 struct sockaddr_in6 *srv_addr6 =
1584 (struct sockaddr_in6 *)&server->dstaddr;
1585
1586 if (!ipv6_addr_equal(&addr6->sin6_addr,
1587 &srv_addr6->sin6_addr))
1588 return false;
1589 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1590 return false;
1591 break;
1592 }
1593 default:
1594 WARN_ON(1);
1595 return false; /* don't expect to be here */
1596 }
1597
1598 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1599 return false;
1600
1601 return true;
1602 }
1603
1604 static bool
1605 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1606 {
1607 unsigned int secFlags;
1608
1609 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1610 secFlags = vol->secFlg;
1611 else
1612 secFlags = global_secflags | vol->secFlg;
1613
1614 switch (server->secType) {
1615 case LANMAN:
1616 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1617 return false;
1618 break;
1619 case NTLMv2:
1620 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1621 return false;
1622 break;
1623 case NTLM:
1624 if (!(secFlags & CIFSSEC_MAY_NTLM))
1625 return false;
1626 break;
1627 case Kerberos:
1628 if (!(secFlags & CIFSSEC_MAY_KRB5))
1629 return false;
1630 break;
1631 case RawNTLMSSP:
1632 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1633 return false;
1634 break;
1635 default:
1636 /* shouldn't happen */
1637 return false;
1638 }
1639
1640 /* now check if signing mode is acceptable */
1641 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1642 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1643 return false;
1644 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1645 (server->sec_mode &
1646 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1647 return false;
1648
1649 return true;
1650 }
1651
1652 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1653 struct smb_vol *vol)
1654 {
1655 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1656 return 0;
1657
1658 if (!match_address(server, addr,
1659 (struct sockaddr *)&vol->srcaddr))
1660 return 0;
1661
1662 if (!match_port(server, addr))
1663 return 0;
1664
1665 if (!match_security(server, vol))
1666 return 0;
1667
1668 return 1;
1669 }
1670
1671 static struct TCP_Server_Info *
1672 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1673 {
1674 struct TCP_Server_Info *server;
1675
1676 spin_lock(&cifs_tcp_ses_lock);
1677 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1678 if (!match_server(server, addr, vol))
1679 continue;
1680
1681 ++server->srv_count;
1682 spin_unlock(&cifs_tcp_ses_lock);
1683 cFYI(1, "Existing tcp session with server found");
1684 return server;
1685 }
1686 spin_unlock(&cifs_tcp_ses_lock);
1687 return NULL;
1688 }
1689
1690 static void
1691 cifs_put_tcp_session(struct TCP_Server_Info *server)
1692 {
1693 struct task_struct *task;
1694
1695 spin_lock(&cifs_tcp_ses_lock);
1696 if (--server->srv_count > 0) {
1697 spin_unlock(&cifs_tcp_ses_lock);
1698 return;
1699 }
1700
1701 put_net(cifs_net_ns(server));
1702
1703 list_del_init(&server->tcp_ses_list);
1704 spin_unlock(&cifs_tcp_ses_lock);
1705
1706 cancel_delayed_work_sync(&server->echo);
1707
1708 spin_lock(&GlobalMid_Lock);
1709 server->tcpStatus = CifsExiting;
1710 spin_unlock(&GlobalMid_Lock);
1711
1712 cifs_crypto_shash_release(server);
1713 cifs_fscache_release_client_cookie(server);
1714
1715 kfree(server->session_key.response);
1716 server->session_key.response = NULL;
1717 server->session_key.len = 0;
1718
1719 task = xchg(&server->tsk, NULL);
1720 if (task)
1721 force_sig(SIGKILL, task);
1722 }
1723
1724 static struct TCP_Server_Info *
1725 cifs_get_tcp_session(struct smb_vol *volume_info)
1726 {
1727 struct TCP_Server_Info *tcp_ses = NULL;
1728 struct sockaddr_storage addr;
1729 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1730 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1731 int rc;
1732
1733 memset(&addr, 0, sizeof(struct sockaddr_storage));
1734
1735 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1736
1737 if (volume_info->UNCip && volume_info->UNC) {
1738 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1739 volume_info->UNCip,
1740 strlen(volume_info->UNCip),
1741 volume_info->port);
1742 if (!rc) {
1743 /* we failed translating address */
1744 rc = -EINVAL;
1745 goto out_err;
1746 }
1747 } else if (volume_info->UNCip) {
1748 /* BB using ip addr as tcp_ses name to connect to the
1749 DFS root below */
1750 cERROR(1, "Connecting to DFS root not implemented yet");
1751 rc = -EINVAL;
1752 goto out_err;
1753 } else /* which tcp_sess DFS root would we conect to */ {
1754 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1755 "unc=//192.168.1.100/public) specified");
1756 rc = -EINVAL;
1757 goto out_err;
1758 }
1759
1760 /* see if we already have a matching tcp_ses */
1761 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1762 if (tcp_ses)
1763 return tcp_ses;
1764
1765 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1766 if (!tcp_ses) {
1767 rc = -ENOMEM;
1768 goto out_err;
1769 }
1770
1771 rc = cifs_crypto_shash_allocate(tcp_ses);
1772 if (rc) {
1773 cERROR(1, "could not setup hash structures rc %d", rc);
1774 goto out_err;
1775 }
1776
1777 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1778 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1779 if (IS_ERR(tcp_ses->hostname)) {
1780 rc = PTR_ERR(tcp_ses->hostname);
1781 goto out_err_crypto_release;
1782 }
1783
1784 tcp_ses->noblocksnd = volume_info->noblocksnd;
1785 tcp_ses->noautotune = volume_info->noautotune;
1786 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1787 atomic_set(&tcp_ses->inFlight, 0);
1788 init_waitqueue_head(&tcp_ses->response_q);
1789 init_waitqueue_head(&tcp_ses->request_q);
1790 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1791 mutex_init(&tcp_ses->srv_mutex);
1792 memcpy(tcp_ses->workstation_RFC1001_name,
1793 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1794 memcpy(tcp_ses->server_RFC1001_name,
1795 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1796 tcp_ses->session_estab = false;
1797 tcp_ses->sequence_number = 0;
1798 tcp_ses->lstrp = jiffies;
1799 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1800 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1801 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1802
1803 /*
1804 * at this point we are the only ones with the pointer
1805 * to the struct since the kernel thread not created yet
1806 * no need to spinlock this init of tcpStatus or srv_count
1807 */
1808 tcp_ses->tcpStatus = CifsNew;
1809 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1810 sizeof(tcp_ses->srcaddr));
1811 ++tcp_ses->srv_count;
1812
1813 if (addr.ss_family == AF_INET6) {
1814 cFYI(1, "attempting ipv6 connect");
1815 /* BB should we allow ipv6 on port 139? */
1816 /* other OS never observed in Wild doing 139 with v6 */
1817 memcpy(&tcp_ses->dstaddr, sin_server6,
1818 sizeof(struct sockaddr_in6));
1819 } else
1820 memcpy(&tcp_ses->dstaddr, sin_server,
1821 sizeof(struct sockaddr_in));
1822
1823 rc = ip_connect(tcp_ses);
1824 if (rc < 0) {
1825 cERROR(1, "Error connecting to socket. Aborting operation");
1826 goto out_err_crypto_release;
1827 }
1828
1829 /*
1830 * since we're in a cifs function already, we know that
1831 * this will succeed. No need for try_module_get().
1832 */
1833 __module_get(THIS_MODULE);
1834 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1835 tcp_ses, "cifsd");
1836 if (IS_ERR(tcp_ses->tsk)) {
1837 rc = PTR_ERR(tcp_ses->tsk);
1838 cERROR(1, "error %d create cifsd thread", rc);
1839 module_put(THIS_MODULE);
1840 goto out_err_crypto_release;
1841 }
1842 tcp_ses->tcpStatus = CifsNeedNegotiate;
1843
1844 /* thread spawned, put it on the list */
1845 spin_lock(&cifs_tcp_ses_lock);
1846 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1847 spin_unlock(&cifs_tcp_ses_lock);
1848
1849 cifs_fscache_get_client_cookie(tcp_ses);
1850
1851 /* queue echo request delayed work */
1852 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1853
1854 return tcp_ses;
1855
1856 out_err_crypto_release:
1857 cifs_crypto_shash_release(tcp_ses);
1858
1859 put_net(cifs_net_ns(tcp_ses));
1860
1861 out_err:
1862 if (tcp_ses) {
1863 if (!IS_ERR(tcp_ses->hostname))
1864 kfree(tcp_ses->hostname);
1865 if (tcp_ses->ssocket)
1866 sock_release(tcp_ses->ssocket);
1867 kfree(tcp_ses);
1868 }
1869 return ERR_PTR(rc);
1870 }
1871
1872 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
1873 {
1874 switch (ses->server->secType) {
1875 case Kerberos:
1876 if (vol->cred_uid != ses->cred_uid)
1877 return 0;
1878 break;
1879 default:
1880 /* anything else takes username/password */
1881 if (ses->user_name == NULL)
1882 return 0;
1883 if (strncmp(ses->user_name, vol->username,
1884 MAX_USERNAME_SIZE))
1885 return 0;
1886 if (strlen(vol->username) != 0 &&
1887 ses->password != NULL &&
1888 strncmp(ses->password,
1889 vol->password ? vol->password : "",
1890 MAX_PASSWORD_SIZE))
1891 return 0;
1892 }
1893 return 1;
1894 }
1895
1896 static struct cifs_ses *
1897 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1898 {
1899 struct cifs_ses *ses;
1900
1901 spin_lock(&cifs_tcp_ses_lock);
1902 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1903 if (!match_session(ses, vol))
1904 continue;
1905 ++ses->ses_count;
1906 spin_unlock(&cifs_tcp_ses_lock);
1907 return ses;
1908 }
1909 spin_unlock(&cifs_tcp_ses_lock);
1910 return NULL;
1911 }
1912
1913 static void
1914 cifs_put_smb_ses(struct cifs_ses *ses)
1915 {
1916 int xid;
1917 struct TCP_Server_Info *server = ses->server;
1918
1919 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1920 spin_lock(&cifs_tcp_ses_lock);
1921 if (--ses->ses_count > 0) {
1922 spin_unlock(&cifs_tcp_ses_lock);
1923 return;
1924 }
1925
1926 list_del_init(&ses->smb_ses_list);
1927 spin_unlock(&cifs_tcp_ses_lock);
1928
1929 if (ses->status == CifsGood) {
1930 xid = GetXid();
1931 CIFSSMBLogoff(xid, ses);
1932 _FreeXid(xid);
1933 }
1934 sesInfoFree(ses);
1935 cifs_put_tcp_session(server);
1936 }
1937
1938 static bool warned_on_ntlm; /* globals init to false automatically */
1939
1940 static struct cifs_ses *
1941 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1942 {
1943 int rc = -ENOMEM, xid;
1944 struct cifs_ses *ses;
1945 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1946 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1947
1948 xid = GetXid();
1949
1950 ses = cifs_find_smb_ses(server, volume_info);
1951 if (ses) {
1952 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1953
1954 mutex_lock(&ses->session_mutex);
1955 rc = cifs_negotiate_protocol(xid, ses);
1956 if (rc) {
1957 mutex_unlock(&ses->session_mutex);
1958 /* problem -- put our ses reference */
1959 cifs_put_smb_ses(ses);
1960 FreeXid(xid);
1961 return ERR_PTR(rc);
1962 }
1963 if (ses->need_reconnect) {
1964 cFYI(1, "Session needs reconnect");
1965 rc = cifs_setup_session(xid, ses,
1966 volume_info->local_nls);
1967 if (rc) {
1968 mutex_unlock(&ses->session_mutex);
1969 /* problem -- put our reference */
1970 cifs_put_smb_ses(ses);
1971 FreeXid(xid);
1972 return ERR_PTR(rc);
1973 }
1974 }
1975 mutex_unlock(&ses->session_mutex);
1976
1977 /* existing SMB ses has a server reference already */
1978 cifs_put_tcp_session(server);
1979 FreeXid(xid);
1980 return ses;
1981 }
1982
1983 cFYI(1, "Existing smb sess not found");
1984 ses = sesInfoAlloc();
1985 if (ses == NULL)
1986 goto get_ses_fail;
1987
1988 /* new SMB session uses our server ref */
1989 ses->server = server;
1990 if (server->dstaddr.ss_family == AF_INET6)
1991 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1992 else
1993 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1994
1995 if (volume_info->username) {
1996 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
1997 if (!ses->user_name)
1998 goto get_ses_fail;
1999 }
2000
2001 /* volume_info->password freed at unmount */
2002 if (volume_info->password) {
2003 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2004 if (!ses->password)
2005 goto get_ses_fail;
2006 }
2007 if (volume_info->domainname) {
2008 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2009 if (!ses->domainName)
2010 goto get_ses_fail;
2011 }
2012 ses->cred_uid = volume_info->cred_uid;
2013 ses->linux_uid = volume_info->linux_uid;
2014
2015 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2016 supported for many years, time to update default security mechanism */
2017 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2018 warned_on_ntlm = true;
2019 cERROR(1, "default security mechanism requested. The default "
2020 "security mechanism will be upgraded from ntlm to "
2021 "ntlmv2 in kernel release 3.2");
2022 }
2023 ses->overrideSecFlg = volume_info->secFlg;
2024
2025 mutex_lock(&ses->session_mutex);
2026 rc = cifs_negotiate_protocol(xid, ses);
2027 if (!rc)
2028 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2029 mutex_unlock(&ses->session_mutex);
2030 if (rc)
2031 goto get_ses_fail;
2032
2033 /* success, put it on the list */
2034 spin_lock(&cifs_tcp_ses_lock);
2035 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2036 spin_unlock(&cifs_tcp_ses_lock);
2037
2038 FreeXid(xid);
2039 return ses;
2040
2041 get_ses_fail:
2042 sesInfoFree(ses);
2043 FreeXid(xid);
2044 return ERR_PTR(rc);
2045 }
2046
2047 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2048 {
2049 if (tcon->tidStatus == CifsExiting)
2050 return 0;
2051 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2052 return 0;
2053 return 1;
2054 }
2055
2056 static struct cifs_tcon *
2057 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2058 {
2059 struct list_head *tmp;
2060 struct cifs_tcon *tcon;
2061
2062 spin_lock(&cifs_tcp_ses_lock);
2063 list_for_each(tmp, &ses->tcon_list) {
2064 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2065 if (!match_tcon(tcon, unc))
2066 continue;
2067 ++tcon->tc_count;
2068 spin_unlock(&cifs_tcp_ses_lock);
2069 return tcon;
2070 }
2071 spin_unlock(&cifs_tcp_ses_lock);
2072 return NULL;
2073 }
2074
2075 static void
2076 cifs_put_tcon(struct cifs_tcon *tcon)
2077 {
2078 int xid;
2079 struct cifs_ses *ses = tcon->ses;
2080
2081 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2082 spin_lock(&cifs_tcp_ses_lock);
2083 if (--tcon->tc_count > 0) {
2084 spin_unlock(&cifs_tcp_ses_lock);
2085 return;
2086 }
2087
2088 list_del_init(&tcon->tcon_list);
2089 spin_unlock(&cifs_tcp_ses_lock);
2090
2091 xid = GetXid();
2092 CIFSSMBTDis(xid, tcon);
2093 _FreeXid(xid);
2094
2095 cifs_fscache_release_super_cookie(tcon);
2096 tconInfoFree(tcon);
2097 cifs_put_smb_ses(ses);
2098 }
2099
2100 static struct cifs_tcon *
2101 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2102 {
2103 int rc, xid;
2104 struct cifs_tcon *tcon;
2105
2106 tcon = cifs_find_tcon(ses, volume_info->UNC);
2107 if (tcon) {
2108 cFYI(1, "Found match on UNC path");
2109 /* existing tcon already has a reference */
2110 cifs_put_smb_ses(ses);
2111 if (tcon->seal != volume_info->seal)
2112 cERROR(1, "transport encryption setting "
2113 "conflicts with existing tid");
2114 return tcon;
2115 }
2116
2117 tcon = tconInfoAlloc();
2118 if (tcon == NULL) {
2119 rc = -ENOMEM;
2120 goto out_fail;
2121 }
2122
2123 tcon->ses = ses;
2124 if (volume_info->password) {
2125 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2126 if (!tcon->password) {
2127 rc = -ENOMEM;
2128 goto out_fail;
2129 }
2130 }
2131
2132 if (strchr(volume_info->UNC + 3, '\\') == NULL
2133 && strchr(volume_info->UNC + 3, '/') == NULL) {
2134 cERROR(1, "Missing share name");
2135 rc = -ENODEV;
2136 goto out_fail;
2137 }
2138
2139 /* BB Do we need to wrap session_mutex around
2140 * this TCon call and Unix SetFS as
2141 * we do on SessSetup and reconnect? */
2142 xid = GetXid();
2143 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2144 FreeXid(xid);
2145 cFYI(1, "CIFS Tcon rc = %d", rc);
2146 if (rc)
2147 goto out_fail;
2148
2149 if (volume_info->nodfs) {
2150 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2151 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2152 }
2153 tcon->seal = volume_info->seal;
2154 /* we can have only one retry value for a connection
2155 to a share so for resources mounted more than once
2156 to the same server share the last value passed in
2157 for the retry flag is used */
2158 tcon->retry = volume_info->retry;
2159 tcon->nocase = volume_info->nocase;
2160 tcon->local_lease = volume_info->local_lease;
2161
2162 spin_lock(&cifs_tcp_ses_lock);
2163 list_add(&tcon->tcon_list, &ses->tcon_list);
2164 spin_unlock(&cifs_tcp_ses_lock);
2165
2166 cifs_fscache_get_super_cookie(tcon);
2167
2168 return tcon;
2169
2170 out_fail:
2171 tconInfoFree(tcon);
2172 return ERR_PTR(rc);
2173 }
2174
2175 void
2176 cifs_put_tlink(struct tcon_link *tlink)
2177 {
2178 if (!tlink || IS_ERR(tlink))
2179 return;
2180
2181 if (!atomic_dec_and_test(&tlink->tl_count) ||
2182 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2183 tlink->tl_time = jiffies;
2184 return;
2185 }
2186
2187 if (!IS_ERR(tlink_tcon(tlink)))
2188 cifs_put_tcon(tlink_tcon(tlink));
2189 kfree(tlink);
2190 return;
2191 }
2192
2193 static inline struct tcon_link *
2194 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2195 {
2196 return cifs_sb->master_tlink;
2197 }
2198
2199 static int
2200 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2201 {
2202 struct cifs_sb_info *old = CIFS_SB(sb);
2203 struct cifs_sb_info *new = mnt_data->cifs_sb;
2204
2205 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2206 return 0;
2207
2208 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2209 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2210 return 0;
2211
2212 if (old->rsize != new->rsize)
2213 return 0;
2214
2215 /*
2216 * We want to share sb only if we don't specify wsize or specified wsize
2217 * is greater or equal than existing one.
2218 */
2219 if (new->wsize && new->wsize < old->wsize)
2220 return 0;
2221
2222 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2223 return 0;
2224
2225 if (old->mnt_file_mode != new->mnt_file_mode ||
2226 old->mnt_dir_mode != new->mnt_dir_mode)
2227 return 0;
2228
2229 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2230 return 0;
2231
2232 if (old->actimeo != new->actimeo)
2233 return 0;
2234
2235 return 1;
2236 }
2237
2238 int
2239 cifs_match_super(struct super_block *sb, void *data)
2240 {
2241 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2242 struct smb_vol *volume_info;
2243 struct cifs_sb_info *cifs_sb;
2244 struct TCP_Server_Info *tcp_srv;
2245 struct cifs_ses *ses;
2246 struct cifs_tcon *tcon;
2247 struct tcon_link *tlink;
2248 struct sockaddr_storage addr;
2249 int rc = 0;
2250
2251 memset(&addr, 0, sizeof(struct sockaddr_storage));
2252
2253 spin_lock(&cifs_tcp_ses_lock);
2254 cifs_sb = CIFS_SB(sb);
2255 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2256 if (IS_ERR(tlink)) {
2257 spin_unlock(&cifs_tcp_ses_lock);
2258 return rc;
2259 }
2260 tcon = tlink_tcon(tlink);
2261 ses = tcon->ses;
2262 tcp_srv = ses->server;
2263
2264 volume_info = mnt_data->vol;
2265
2266 if (!volume_info->UNCip || !volume_info->UNC)
2267 goto out;
2268
2269 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2270 volume_info->UNCip,
2271 strlen(volume_info->UNCip),
2272 volume_info->port);
2273 if (!rc)
2274 goto out;
2275
2276 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2277 !match_session(ses, volume_info) ||
2278 !match_tcon(tcon, volume_info->UNC)) {
2279 rc = 0;
2280 goto out;
2281 }
2282
2283 rc = compare_mount_options(sb, mnt_data);
2284 out:
2285 spin_unlock(&cifs_tcp_ses_lock);
2286 cifs_put_tlink(tlink);
2287 return rc;
2288 }
2289
2290 int
2291 get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
2292 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2293 struct dfs_info3_param **preferrals, int remap)
2294 {
2295 char *temp_unc;
2296 int rc = 0;
2297
2298 *pnum_referrals = 0;
2299 *preferrals = NULL;
2300
2301 if (pSesInfo->ipc_tid == 0) {
2302 temp_unc = kmalloc(2 /* for slashes */ +
2303 strnlen(pSesInfo->serverName,
2304 SERVER_NAME_LEN_WITH_NULL * 2)
2305 + 1 + 4 /* slash IPC$ */ + 2,
2306 GFP_KERNEL);
2307 if (temp_unc == NULL)
2308 return -ENOMEM;
2309 temp_unc[0] = '\\';
2310 temp_unc[1] = '\\';
2311 strcpy(temp_unc + 2, pSesInfo->serverName);
2312 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2313 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2314 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2315 kfree(temp_unc);
2316 }
2317 if (rc == 0)
2318 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2319 pnum_referrals, nls_codepage, remap);
2320 /* BB map targetUNCs to dfs_info3 structures, here or
2321 in CIFSGetDFSRefer BB */
2322
2323 return rc;
2324 }
2325
2326 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2327 static struct lock_class_key cifs_key[2];
2328 static struct lock_class_key cifs_slock_key[2];
2329
2330 static inline void
2331 cifs_reclassify_socket4(struct socket *sock)
2332 {
2333 struct sock *sk = sock->sk;
2334 BUG_ON(sock_owned_by_user(sk));
2335 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2336 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2337 }
2338
2339 static inline void
2340 cifs_reclassify_socket6(struct socket *sock)
2341 {
2342 struct sock *sk = sock->sk;
2343 BUG_ON(sock_owned_by_user(sk));
2344 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2345 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2346 }
2347 #else
2348 static inline void
2349 cifs_reclassify_socket4(struct socket *sock)
2350 {
2351 }
2352
2353 static inline void
2354 cifs_reclassify_socket6(struct socket *sock)
2355 {
2356 }
2357 #endif
2358
2359 /* See RFC1001 section 14 on representation of Netbios names */
2360 static void rfc1002mangle(char *target, char *source, unsigned int length)
2361 {
2362 unsigned int i, j;
2363
2364 for (i = 0, j = 0; i < (length); i++) {
2365 /* mask a nibble at a time and encode */
2366 target[j] = 'A' + (0x0F & (source[i] >> 4));
2367 target[j+1] = 'A' + (0x0F & source[i]);
2368 j += 2;
2369 }
2370
2371 }
2372
2373 static int
2374 bind_socket(struct TCP_Server_Info *server)
2375 {
2376 int rc = 0;
2377 if (server->srcaddr.ss_family != AF_UNSPEC) {
2378 /* Bind to the specified local IP address */
2379 struct socket *socket = server->ssocket;
2380 rc = socket->ops->bind(socket,
2381 (struct sockaddr *) &server->srcaddr,
2382 sizeof(server->srcaddr));
2383 if (rc < 0) {
2384 struct sockaddr_in *saddr4;
2385 struct sockaddr_in6 *saddr6;
2386 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2387 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2388 if (saddr6->sin6_family == AF_INET6)
2389 cERROR(1, "cifs: "
2390 "Failed to bind to: %pI6c, error: %d\n",
2391 &saddr6->sin6_addr, rc);
2392 else
2393 cERROR(1, "cifs: "
2394 "Failed to bind to: %pI4, error: %d\n",
2395 &saddr4->sin_addr.s_addr, rc);
2396 }
2397 }
2398 return rc;
2399 }
2400
2401 static int
2402 ip_rfc1001_connect(struct TCP_Server_Info *server)
2403 {
2404 int rc = 0;
2405 /*
2406 * some servers require RFC1001 sessinit before sending
2407 * negprot - BB check reconnection in case where second
2408 * sessinit is sent but no second negprot
2409 */
2410 struct rfc1002_session_packet *ses_init_buf;
2411 struct smb_hdr *smb_buf;
2412 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2413 GFP_KERNEL);
2414 if (ses_init_buf) {
2415 ses_init_buf->trailer.session_req.called_len = 32;
2416
2417 if (server->server_RFC1001_name &&
2418 server->server_RFC1001_name[0] != 0)
2419 rfc1002mangle(ses_init_buf->trailer.
2420 session_req.called_name,
2421 server->server_RFC1001_name,
2422 RFC1001_NAME_LEN_WITH_NULL);
2423 else
2424 rfc1002mangle(ses_init_buf->trailer.
2425 session_req.called_name,
2426 DEFAULT_CIFS_CALLED_NAME,
2427 RFC1001_NAME_LEN_WITH_NULL);
2428
2429 ses_init_buf->trailer.session_req.calling_len = 32;
2430
2431 /*
2432 * calling name ends in null (byte 16) from old smb
2433 * convention.
2434 */
2435 if (server->workstation_RFC1001_name &&
2436 server->workstation_RFC1001_name[0] != 0)
2437 rfc1002mangle(ses_init_buf->trailer.
2438 session_req.calling_name,
2439 server->workstation_RFC1001_name,
2440 RFC1001_NAME_LEN_WITH_NULL);
2441 else
2442 rfc1002mangle(ses_init_buf->trailer.
2443 session_req.calling_name,
2444 "LINUX_CIFS_CLNT",
2445 RFC1001_NAME_LEN_WITH_NULL);
2446
2447 ses_init_buf->trailer.session_req.scope1 = 0;
2448 ses_init_buf->trailer.session_req.scope2 = 0;
2449 smb_buf = (struct smb_hdr *)ses_init_buf;
2450
2451 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2452 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2453 rc = smb_send(server, smb_buf, 0x44);
2454 kfree(ses_init_buf);
2455 /*
2456 * RFC1001 layer in at least one server
2457 * requires very short break before negprot
2458 * presumably because not expecting negprot
2459 * to follow so fast. This is a simple
2460 * solution that works without
2461 * complicating the code and causes no
2462 * significant slowing down on mount
2463 * for everyone else
2464 */
2465 usleep_range(1000, 2000);
2466 }
2467 /*
2468 * else the negprot may still work without this
2469 * even though malloc failed
2470 */
2471
2472 return rc;
2473 }
2474
2475 static int
2476 generic_ip_connect(struct TCP_Server_Info *server)
2477 {
2478 int rc = 0;
2479 __be16 sport;
2480 int slen, sfamily;
2481 struct socket *socket = server->ssocket;
2482 struct sockaddr *saddr;
2483
2484 saddr = (struct sockaddr *) &server->dstaddr;
2485
2486 if (server->dstaddr.ss_family == AF_INET6) {
2487 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2488 slen = sizeof(struct sockaddr_in6);
2489 sfamily = AF_INET6;
2490 } else {
2491 sport = ((struct sockaddr_in *) saddr)->sin_port;
2492 slen = sizeof(struct sockaddr_in);
2493 sfamily = AF_INET;
2494 }
2495
2496 if (socket == NULL) {
2497 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2498 IPPROTO_TCP, &socket, 1);
2499 if (rc < 0) {
2500 cERROR(1, "Error %d creating socket", rc);
2501 server->ssocket = NULL;
2502 return rc;
2503 }
2504
2505 /* BB other socket options to set KEEPALIVE, NODELAY? */
2506 cFYI(1, "Socket created");
2507 server->ssocket = socket;
2508 socket->sk->sk_allocation = GFP_NOFS;
2509 if (sfamily == AF_INET6)
2510 cifs_reclassify_socket6(socket);
2511 else
2512 cifs_reclassify_socket4(socket);
2513 }
2514
2515 rc = bind_socket(server);
2516 if (rc < 0)
2517 return rc;
2518
2519 /*
2520 * Eventually check for other socket options to change from
2521 * the default. sock_setsockopt not used because it expects
2522 * user space buffer
2523 */
2524 socket->sk->sk_rcvtimeo = 7 * HZ;
2525 socket->sk->sk_sndtimeo = 5 * HZ;
2526
2527 /* make the bufsizes depend on wsize/rsize and max requests */
2528 if (server->noautotune) {
2529 if (socket->sk->sk_sndbuf < (200 * 1024))
2530 socket->sk->sk_sndbuf = 200 * 1024;
2531 if (socket->sk->sk_rcvbuf < (140 * 1024))
2532 socket->sk->sk_rcvbuf = 140 * 1024;
2533 }
2534
2535 if (server->tcp_nodelay) {
2536 int val = 1;
2537 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2538 (char *)&val, sizeof(val));
2539 if (rc)
2540 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2541 }
2542
2543 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2544 socket->sk->sk_sndbuf,
2545 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2546
2547 rc = socket->ops->connect(socket, saddr, slen, 0);
2548 if (rc < 0) {
2549 cFYI(1, "Error %d connecting to server", rc);
2550 sock_release(socket);
2551 server->ssocket = NULL;
2552 return rc;
2553 }
2554
2555 if (sport == htons(RFC1001_PORT))
2556 rc = ip_rfc1001_connect(server);
2557
2558 return rc;
2559 }
2560
2561 static int
2562 ip_connect(struct TCP_Server_Info *server)
2563 {
2564 __be16 *sport;
2565 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2566 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2567
2568 if (server->dstaddr.ss_family == AF_INET6)
2569 sport = &addr6->sin6_port;
2570 else
2571 sport = &addr->sin_port;
2572
2573 if (*sport == 0) {
2574 int rc;
2575
2576 /* try with 445 port at first */
2577 *sport = htons(CIFS_PORT);
2578
2579 rc = generic_ip_connect(server);
2580 if (rc >= 0)
2581 return rc;
2582
2583 /* if it failed, try with 139 port */
2584 *sport = htons(RFC1001_PORT);
2585 }
2586
2587 return generic_ip_connect(server);
2588 }
2589
2590 void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
2591 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
2592 {
2593 /* if we are reconnecting then should we check to see if
2594 * any requested capabilities changed locally e.g. via
2595 * remount but we can not do much about it here
2596 * if they have (even if we could detect it by the following)
2597 * Perhaps we could add a backpointer to array of sb from tcon
2598 * or if we change to make all sb to same share the same
2599 * sb as NFS - then we only have one backpointer to sb.
2600 * What if we wanted to mount the server share twice once with
2601 * and once without posixacls or posix paths? */
2602 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2603
2604 if (vol_info && vol_info->no_linux_ext) {
2605 tcon->fsUnixInfo.Capability = 0;
2606 tcon->unix_ext = 0; /* Unix Extensions disabled */
2607 cFYI(1, "Linux protocol extensions disabled");
2608 return;
2609 } else if (vol_info)
2610 tcon->unix_ext = 1; /* Unix Extensions supported */
2611
2612 if (tcon->unix_ext == 0) {
2613 cFYI(1, "Unix extensions disabled so not set on reconnect");
2614 return;
2615 }
2616
2617 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2618 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2619 cFYI(1, "unix caps which server supports %lld", cap);
2620 /* check for reconnect case in which we do not
2621 want to change the mount behavior if we can avoid it */
2622 if (vol_info == NULL) {
2623 /* turn off POSIX ACL and PATHNAMES if not set
2624 originally at mount time */
2625 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2626 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2627 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2628 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2629 cERROR(1, "POSIXPATH support change");
2630 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2631 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2632 cERROR(1, "possible reconnect error");
2633 cERROR(1, "server disabled POSIX path support");
2634 }
2635 }
2636
2637 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2638 cERROR(1, "per-share encryption not supported yet");
2639
2640 cap &= CIFS_UNIX_CAP_MASK;
2641 if (vol_info && vol_info->no_psx_acl)
2642 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2643 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2644 cFYI(1, "negotiated posix acl support");
2645 if (cifs_sb)
2646 cifs_sb->mnt_cifs_flags |=
2647 CIFS_MOUNT_POSIXACL;
2648 }
2649
2650 if (vol_info && vol_info->posix_paths == 0)
2651 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2652 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2653 cFYI(1, "negotiate posix pathnames");
2654 if (cifs_sb)
2655 cifs_sb->mnt_cifs_flags |=
2656 CIFS_MOUNT_POSIX_PATHS;
2657 }
2658
2659 if (cifs_sb && (cifs_sb->rsize > 127 * 1024)) {
2660 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2661 cifs_sb->rsize = 127 * 1024;
2662 cFYI(DBG2, "larger reads not supported by srv");
2663 }
2664 }
2665
2666
2667 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2668 #ifdef CONFIG_CIFS_DEBUG2
2669 if (cap & CIFS_UNIX_FCNTL_CAP)
2670 cFYI(1, "FCNTL cap");
2671 if (cap & CIFS_UNIX_EXTATTR_CAP)
2672 cFYI(1, "EXTATTR cap");
2673 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2674 cFYI(1, "POSIX path cap");
2675 if (cap & CIFS_UNIX_XATTR_CAP)
2676 cFYI(1, "XATTR cap");
2677 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2678 cFYI(1, "POSIX ACL cap");
2679 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2680 cFYI(1, "very large read cap");
2681 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2682 cFYI(1, "very large write cap");
2683 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2684 cFYI(1, "transport encryption cap");
2685 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2686 cFYI(1, "mandatory transport encryption cap");
2687 #endif /* CIFS_DEBUG2 */
2688 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2689 if (vol_info == NULL) {
2690 cFYI(1, "resetting capabilities failed");
2691 } else
2692 cERROR(1, "Negotiating Unix capabilities "
2693 "with the server failed. Consider "
2694 "mounting with the Unix Extensions\n"
2695 "disabled, if problems are found, "
2696 "by specifying the nounix mount "
2697 "option.");
2698
2699 }
2700 }
2701 }
2702
2703 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2704 struct cifs_sb_info *cifs_sb)
2705 {
2706 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2707
2708 spin_lock_init(&cifs_sb->tlink_tree_lock);
2709 cifs_sb->tlink_tree = RB_ROOT;
2710
2711 if (pvolume_info->rsize > CIFSMaxBufSize) {
2712 cERROR(1, "rsize %d too large, using MaxBufSize",
2713 pvolume_info->rsize);
2714 cifs_sb->rsize = CIFSMaxBufSize;
2715 } else if ((pvolume_info->rsize) &&
2716 (pvolume_info->rsize <= CIFSMaxBufSize))
2717 cifs_sb->rsize = pvolume_info->rsize;
2718 else /* default */
2719 cifs_sb->rsize = CIFSMaxBufSize;
2720
2721 if (cifs_sb->rsize < 2048) {
2722 cifs_sb->rsize = 2048;
2723 /* Windows ME may prefer this */
2724 cFYI(1, "readsize set to minimum: 2048");
2725 }
2726
2727 /*
2728 * Temporarily set wsize for matching superblock. If we end up using
2729 * new sb then cifs_negotiate_wsize will later negotiate it downward
2730 * if needed.
2731 */
2732 cifs_sb->wsize = pvolume_info->wsize;
2733
2734 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2735 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2736 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2737 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2738 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2739 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2740
2741 cifs_sb->actimeo = pvolume_info->actimeo;
2742 cifs_sb->local_nls = pvolume_info->local_nls;
2743
2744 if (pvolume_info->noperm)
2745 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2746 if (pvolume_info->setuids)
2747 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2748 if (pvolume_info->server_ino)
2749 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2750 if (pvolume_info->remap)
2751 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2752 if (pvolume_info->no_xattr)
2753 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2754 if (pvolume_info->sfu_emul)
2755 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2756 if (pvolume_info->nobrl)
2757 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2758 if (pvolume_info->nostrictsync)
2759 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2760 if (pvolume_info->mand_lock)
2761 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2762 if (pvolume_info->rwpidforward)
2763 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
2764 if (pvolume_info->cifs_acl)
2765 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2766 if (pvolume_info->override_uid)
2767 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2768 if (pvolume_info->override_gid)
2769 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2770 if (pvolume_info->dynperm)
2771 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2772 if (pvolume_info->fsc)
2773 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2774 if (pvolume_info->multiuser)
2775 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2776 CIFS_MOUNT_NO_PERM);
2777 if (pvolume_info->strict_io)
2778 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2779 if (pvolume_info->direct_io) {
2780 cFYI(1, "mounting share using direct i/o");
2781 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2782 }
2783 if (pvolume_info->mfsymlinks) {
2784 if (pvolume_info->sfu_emul) {
2785 cERROR(1, "mount option mfsymlinks ignored if sfu "
2786 "mount option is used");
2787 } else {
2788 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2789 }
2790 }
2791
2792 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2793 cERROR(1, "mount option dynperm ignored if cifsacl "
2794 "mount option supported");
2795 }
2796
2797 /*
2798 * When the server supports very large writes via POSIX extensions, we can
2799 * allow up to 2^24-1, minus the size of a WRITE_AND_X header, not including
2800 * the RFC1001 length.
2801 *
2802 * Note that this might make for "interesting" allocation problems during
2803 * writeback however as we have to allocate an array of pointers for the
2804 * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2805 */
2806 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
2807
2808 /*
2809 * When the server doesn't allow large posix writes, only allow a wsize of
2810 * 128k minus the size of the WRITE_AND_X header. That allows for a write up
2811 * to the maximum size described by RFC1002.
2812 */
2813 #define CIFS_MAX_RFC1002_WSIZE (128 * 1024 - sizeof(WRITE_REQ) + 4)
2814
2815 /*
2816 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2817 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2818 * a single wsize request with a single call.
2819 */
2820 #define CIFS_DEFAULT_WSIZE (1024 * 1024)
2821
2822 static unsigned int
2823 cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2824 {
2825 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2826 struct TCP_Server_Info *server = tcon->ses->server;
2827 unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
2828 CIFS_DEFAULT_WSIZE;
2829
2830 /* can server support 24-bit write sizes? (via UNIX extensions) */
2831 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2832 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
2833
2834 /*
2835 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
2836 * Limit it to max buffer offered by the server, minus the size of the
2837 * WRITEX header, not including the 4 byte RFC1001 length.
2838 */
2839 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
2840 (!(server->capabilities & CAP_UNIX) &&
2841 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
2842 wsize = min_t(unsigned int, wsize,
2843 server->maxBuf - sizeof(WRITE_REQ) + 4);
2844
2845 /* hard limit of CIFS_MAX_WSIZE */
2846 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2847
2848 return wsize;
2849 }
2850
2851 static int
2852 is_path_accessible(int xid, struct cifs_tcon *tcon,
2853 struct cifs_sb_info *cifs_sb, const char *full_path)
2854 {
2855 int rc;
2856 FILE_ALL_INFO *pfile_info;
2857
2858 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2859 if (pfile_info == NULL)
2860 return -ENOMEM;
2861
2862 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2863 0 /* not legacy */, cifs_sb->local_nls,
2864 cifs_sb->mnt_cifs_flags &
2865 CIFS_MOUNT_MAP_SPECIAL_CHR);
2866
2867 if (rc == -EOPNOTSUPP || rc == -EINVAL)
2868 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
2869 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
2870 CIFS_MOUNT_MAP_SPECIAL_CHR);
2871 kfree(pfile_info);
2872 return rc;
2873 }
2874
2875 static void
2876 cleanup_volume_info_contents(struct smb_vol *volume_info)
2877 {
2878 kfree(volume_info->username);
2879 kzfree(volume_info->password);
2880 kfree(volume_info->UNC);
2881 if (volume_info->UNCip != volume_info->UNC + 2)
2882 kfree(volume_info->UNCip);
2883 kfree(volume_info->domainname);
2884 kfree(volume_info->iocharset);
2885 kfree(volume_info->prepath);
2886 }
2887
2888 void
2889 cifs_cleanup_volume_info(struct smb_vol *volume_info)
2890 {
2891 if (!volume_info)
2892 return;
2893 cleanup_volume_info_contents(volume_info);
2894 kfree(volume_info);
2895 }
2896
2897
2898 #ifdef CONFIG_CIFS_DFS_UPCALL
2899 /* build_path_to_root returns full path to root when
2900 * we do not have an exiting connection (tcon) */
2901 static char *
2902 build_unc_path_to_root(const struct smb_vol *vol,
2903 const struct cifs_sb_info *cifs_sb)
2904 {
2905 char *full_path, *pos;
2906 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
2907 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
2908
2909 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
2910 if (full_path == NULL)
2911 return ERR_PTR(-ENOMEM);
2912
2913 strncpy(full_path, vol->UNC, unc_len);
2914 pos = full_path + unc_len;
2915
2916 if (pplen) {
2917 strncpy(pos, vol->prepath, pplen);
2918 pos += pplen;
2919 }
2920
2921 *pos = '\0'; /* add trailing null */
2922 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
2923 cFYI(1, "%s: full_path=%s", __func__, full_path);
2924 return full_path;
2925 }
2926
2927 /*
2928 * Perform a dfs referral query for a share and (optionally) prefix
2929 *
2930 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
2931 * to a string containing updated options for the submount. Otherwise it
2932 * will be left untouched.
2933 *
2934 * Returns the rc from get_dfs_path to the caller, which can be used to
2935 * determine whether there were referrals.
2936 */
2937 static int
2938 expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
2939 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
2940 int check_prefix)
2941 {
2942 int rc;
2943 unsigned int num_referrals = 0;
2944 struct dfs_info3_param *referrals = NULL;
2945 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
2946
2947 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2948 if (IS_ERR(full_path))
2949 return PTR_ERR(full_path);
2950
2951 /* For DFS paths, skip the first '\' of the UNC */
2952 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
2953
2954 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
2955 &num_referrals, &referrals,
2956 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2957
2958 if (!rc && num_referrals > 0) {
2959 char *fake_devname = NULL;
2960
2961 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
2962 full_path + 1, referrals,
2963 &fake_devname);
2964
2965 free_dfs_info_array(referrals, num_referrals);
2966
2967 if (IS_ERR(mdata)) {
2968 rc = PTR_ERR(mdata);
2969 mdata = NULL;
2970 } else {
2971 cleanup_volume_info_contents(volume_info);
2972 memset(volume_info, '\0', sizeof(*volume_info));
2973 rc = cifs_setup_volume_info(volume_info, mdata,
2974 fake_devname);
2975 }
2976 kfree(fake_devname);
2977 kfree(cifs_sb->mountdata);
2978 cifs_sb->mountdata = mdata;
2979 }
2980 kfree(full_path);
2981 return rc;
2982 }
2983 #endif
2984
2985 static int
2986 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
2987 const char *devname)
2988 {
2989 int rc = 0;
2990
2991 if (cifs_parse_mount_options(mount_data, devname, volume_info))
2992 return -EINVAL;
2993
2994 if (volume_info->nullauth) {
2995 cFYI(1, "null user");
2996 volume_info->username = kzalloc(1, GFP_KERNEL);
2997 if (volume_info->username == NULL)
2998 return -ENOMEM;
2999 } else if (volume_info->username) {
3000 /* BB fixme parse for domain name here */
3001 cFYI(1, "Username: %s", volume_info->username);
3002 } else {
3003 cifserror("No username specified");
3004 /* In userspace mount helper we can get user name from alternate
3005 locations such as env variables and files on disk */
3006 return -EINVAL;
3007 }
3008
3009 /* this is needed for ASCII cp to Unicode converts */
3010 if (volume_info->iocharset == NULL) {
3011 /* load_nls_default cannot return null */
3012 volume_info->local_nls = load_nls_default();
3013 } else {
3014 volume_info->local_nls = load_nls(volume_info->iocharset);
3015 if (volume_info->local_nls == NULL) {
3016 cERROR(1, "CIFS mount error: iocharset %s not found",
3017 volume_info->iocharset);
3018 return -ELIBACC;
3019 }
3020 }
3021
3022 return rc;
3023 }
3024
3025 struct smb_vol *
3026 cifs_get_volume_info(char *mount_data, const char *devname)
3027 {
3028 int rc;
3029 struct smb_vol *volume_info;
3030
3031 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3032 if (!volume_info)
3033 return ERR_PTR(-ENOMEM);
3034
3035 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3036 if (rc) {
3037 cifs_cleanup_volume_info(volume_info);
3038 volume_info = ERR_PTR(rc);
3039 }
3040
3041 return volume_info;
3042 }
3043
3044 int
3045 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3046 {
3047 int rc = 0;
3048 int xid;
3049 struct cifs_ses *pSesInfo;
3050 struct cifs_tcon *tcon;
3051 struct TCP_Server_Info *srvTcp;
3052 char *full_path;
3053 struct tcon_link *tlink;
3054 #ifdef CONFIG_CIFS_DFS_UPCALL
3055 int referral_walks_count = 0;
3056 #endif
3057
3058 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3059 if (rc)
3060 return rc;
3061
3062 cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
3063
3064 #ifdef CONFIG_CIFS_DFS_UPCALL
3065 try_mount_again:
3066 /* cleanup activities if we're chasing a referral */
3067 if (referral_walks_count) {
3068 if (tcon)
3069 cifs_put_tcon(tcon);
3070 else if (pSesInfo)
3071 cifs_put_smb_ses(pSesInfo);
3072
3073 FreeXid(xid);
3074 }
3075 #endif
3076 tcon = NULL;
3077 pSesInfo = NULL;
3078 srvTcp = NULL;
3079 full_path = NULL;
3080 tlink = NULL;
3081
3082 xid = GetXid();
3083
3084 /* get a reference to a tcp session */
3085 srvTcp = cifs_get_tcp_session(volume_info);
3086 if (IS_ERR(srvTcp)) {
3087 rc = PTR_ERR(srvTcp);
3088 bdi_destroy(&cifs_sb->bdi);
3089 goto out;
3090 }
3091
3092 /* get a reference to a SMB session */
3093 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3094 if (IS_ERR(pSesInfo)) {
3095 rc = PTR_ERR(pSesInfo);
3096 pSesInfo = NULL;
3097 goto mount_fail_check;
3098 }
3099
3100 /* search for existing tcon to this server share */
3101 tcon = cifs_get_tcon(pSesInfo, volume_info);
3102 if (IS_ERR(tcon)) {
3103 rc = PTR_ERR(tcon);
3104 tcon = NULL;
3105 goto remote_path_check;
3106 }
3107
3108 /* tell server which Unix caps we support */
3109 if (tcon->ses->capabilities & CAP_UNIX) {
3110 /* reset of caps checks mount to see if unix extensions
3111 disabled for just this mount */
3112 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3113 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3114 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3115 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3116 rc = -EACCES;
3117 goto mount_fail_check;
3118 }
3119 } else
3120 tcon->unix_ext = 0; /* server does not support them */
3121
3122 /* do not care if following two calls succeed - informational */
3123 if (!tcon->ipc) {
3124 CIFSSMBQFSDeviceInfo(xid, tcon);
3125 CIFSSMBQFSAttributeInfo(xid, tcon);
3126 }
3127
3128 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
3129 cifs_sb->rsize = 1024 * 127;
3130 cFYI(DBG2, "no very large read support, rsize now 127K");
3131 }
3132 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
3133 cifs_sb->rsize = min(cifs_sb->rsize,
3134 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
3135
3136 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3137
3138 remote_path_check:
3139 #ifdef CONFIG_CIFS_DFS_UPCALL
3140 /*
3141 * Perform an unconditional check for whether there are DFS
3142 * referrals for this path without prefix, to provide support
3143 * for DFS referrals from w2k8 servers which don't seem to respond
3144 * with PATH_NOT_COVERED to requests that include the prefix.
3145 * Chase the referral if found, otherwise continue normally.
3146 */
3147 if (referral_walks_count == 0) {
3148 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3149 cifs_sb, false);
3150 if (!refrc) {
3151 referral_walks_count++;
3152 goto try_mount_again;
3153 }
3154 }
3155 #endif
3156
3157 /* check if a whole path is not remote */
3158 if (!rc && tcon) {
3159 /* build_path_to_root works only when we have a valid tcon */
3160 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3161 if (full_path == NULL) {
3162 rc = -ENOMEM;
3163 goto mount_fail_check;
3164 }
3165 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3166 if (rc != 0 && rc != -EREMOTE) {
3167 kfree(full_path);
3168 goto mount_fail_check;
3169 }
3170 kfree(full_path);
3171 }
3172
3173 /* get referral if needed */
3174 if (rc == -EREMOTE) {
3175 #ifdef CONFIG_CIFS_DFS_UPCALL
3176 if (referral_walks_count > MAX_NESTED_LINKS) {
3177 /*
3178 * BB: when we implement proper loop detection,
3179 * we will remove this check. But now we need it
3180 * to prevent an indefinite loop if 'DFS tree' is
3181 * misconfigured (i.e. has loops).
3182 */
3183 rc = -ELOOP;
3184 goto mount_fail_check;
3185 }
3186
3187 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3188 true);
3189
3190 if (!rc) {
3191 referral_walks_count++;
3192 goto try_mount_again;
3193 }
3194 goto mount_fail_check;
3195 #else /* No DFS support, return error on mount */
3196 rc = -EOPNOTSUPP;
3197 #endif
3198 }
3199
3200 if (rc)
3201 goto mount_fail_check;
3202
3203 /* now, hang the tcon off of the superblock */
3204 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3205 if (tlink == NULL) {
3206 rc = -ENOMEM;
3207 goto mount_fail_check;
3208 }
3209
3210 tlink->tl_uid = pSesInfo->linux_uid;
3211 tlink->tl_tcon = tcon;
3212 tlink->tl_time = jiffies;
3213 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3214 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3215
3216 cifs_sb->master_tlink = tlink;
3217 spin_lock(&cifs_sb->tlink_tree_lock);
3218 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3219 spin_unlock(&cifs_sb->tlink_tree_lock);
3220
3221 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3222 TLINK_IDLE_EXPIRE);
3223
3224 mount_fail_check:
3225 /* on error free sesinfo and tcon struct if needed */
3226 if (rc) {
3227 /* If find_unc succeeded then rc == 0 so we can not end */
3228 /* up accidentally freeing someone elses tcon struct */
3229 if (tcon)
3230 cifs_put_tcon(tcon);
3231 else if (pSesInfo)
3232 cifs_put_smb_ses(pSesInfo);
3233 else
3234 cifs_put_tcp_session(srvTcp);
3235 bdi_destroy(&cifs_sb->bdi);
3236 }
3237
3238 out:
3239 FreeXid(xid);
3240 return rc;
3241 }
3242
3243 /*
3244 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3245 * pointer may be NULL.
3246 */
3247 int
3248 CIFSTCon(unsigned int xid, struct cifs_ses *ses,
3249 const char *tree, struct cifs_tcon *tcon,
3250 const struct nls_table *nls_codepage)
3251 {
3252 struct smb_hdr *smb_buffer;
3253 struct smb_hdr *smb_buffer_response;
3254 TCONX_REQ *pSMB;
3255 TCONX_RSP *pSMBr;
3256 unsigned char *bcc_ptr;
3257 int rc = 0;
3258 int length;
3259 __u16 bytes_left, count;
3260
3261 if (ses == NULL)
3262 return -EIO;
3263
3264 smb_buffer = cifs_buf_get();
3265 if (smb_buffer == NULL)
3266 return -ENOMEM;
3267
3268 smb_buffer_response = smb_buffer;
3269
3270 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3271 NULL /*no tid */ , 4 /*wct */ );
3272
3273 smb_buffer->Mid = GetNextMid(ses->server);
3274 smb_buffer->Uid = ses->Suid;
3275 pSMB = (TCONX_REQ *) smb_buffer;
3276 pSMBr = (TCONX_RSP *) smb_buffer_response;
3277
3278 pSMB->AndXCommand = 0xFF;
3279 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3280 bcc_ptr = &pSMB->Password[0];
3281 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3282 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3283 *bcc_ptr = 0; /* password is null byte */
3284 bcc_ptr++; /* skip password */
3285 /* already aligned so no need to do it below */
3286 } else {
3287 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3288 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3289 specified as required (when that support is added to
3290 the vfs in the future) as only NTLM or the much
3291 weaker LANMAN (which we do not send by default) is accepted
3292 by Samba (not sure whether other servers allow
3293 NTLMv2 password here) */
3294 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3295 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3296 (ses->server->secType == LANMAN))
3297 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3298 ses->server->sec_mode &
3299 SECMODE_PW_ENCRYPT ? true : false,
3300 bcc_ptr);
3301 else
3302 #endif /* CIFS_WEAK_PW_HASH */
3303 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3304 bcc_ptr);
3305
3306 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3307 if (ses->capabilities & CAP_UNICODE) {
3308 /* must align unicode strings */
3309 *bcc_ptr = 0; /* null byte password */
3310 bcc_ptr++;
3311 }
3312 }
3313
3314 if (ses->server->sec_mode &
3315 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3316 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3317
3318 if (ses->capabilities & CAP_STATUS32) {
3319 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3320 }
3321 if (ses->capabilities & CAP_DFS) {
3322 smb_buffer->Flags2 |= SMBFLG2_DFS;
3323 }
3324 if (ses->capabilities & CAP_UNICODE) {
3325 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3326 length =
3327 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3328 6 /* max utf8 char length in bytes */ *
3329 (/* server len*/ + 256 /* share len */), nls_codepage);
3330 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3331 bcc_ptr += 2; /* skip trailing null */
3332 } else { /* ASCII */
3333 strcpy(bcc_ptr, tree);
3334 bcc_ptr += strlen(tree) + 1;
3335 }
3336 strcpy(bcc_ptr, "?????");
3337 bcc_ptr += strlen("?????");
3338 bcc_ptr += 1;
3339 count = bcc_ptr - &pSMB->Password[0];
3340 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3341 pSMB->hdr.smb_buf_length) + count);
3342 pSMB->ByteCount = cpu_to_le16(count);
3343
3344 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3345 0);
3346
3347 /* above now done in SendReceive */
3348 if ((rc == 0) && (tcon != NULL)) {
3349 bool is_unicode;
3350
3351 tcon->tidStatus = CifsGood;
3352 tcon->need_reconnect = false;
3353 tcon->tid = smb_buffer_response->Tid;
3354 bcc_ptr = pByteArea(smb_buffer_response);
3355 bytes_left = get_bcc(smb_buffer_response);
3356 length = strnlen(bcc_ptr, bytes_left - 2);
3357 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3358 is_unicode = true;
3359 else
3360 is_unicode = false;
3361
3362
3363 /* skip service field (NB: this field is always ASCII) */
3364 if (length == 3) {
3365 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3366 (bcc_ptr[2] == 'C')) {
3367 cFYI(1, "IPC connection");
3368 tcon->ipc = 1;
3369 }
3370 } else if (length == 2) {
3371 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3372 /* the most common case */
3373 cFYI(1, "disk share connection");
3374 }
3375 }
3376 bcc_ptr += length + 1;
3377 bytes_left -= (length + 1);
3378 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3379
3380 /* mostly informational -- no need to fail on error here */
3381 kfree(tcon->nativeFileSystem);
3382 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3383 bytes_left, is_unicode,
3384 nls_codepage);
3385
3386 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3387
3388 if ((smb_buffer_response->WordCount == 3) ||
3389 (smb_buffer_response->WordCount == 7))
3390 /* field is in same location */
3391 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3392 else
3393 tcon->Flags = 0;
3394 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3395 } else if ((rc == 0) && tcon == NULL) {
3396 /* all we need to save for IPC$ connection */
3397 ses->ipc_tid = smb_buffer_response->Tid;
3398 }
3399
3400 cifs_buf_release(smb_buffer);
3401 return rc;
3402 }
3403
3404 void
3405 cifs_umount(struct cifs_sb_info *cifs_sb)
3406 {
3407 struct rb_root *root = &cifs_sb->tlink_tree;
3408 struct rb_node *node;
3409 struct tcon_link *tlink;
3410
3411 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3412
3413 spin_lock(&cifs_sb->tlink_tree_lock);
3414 while ((node = rb_first(root))) {
3415 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3416 cifs_get_tlink(tlink);
3417 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3418 rb_erase(node, root);
3419
3420 spin_unlock(&cifs_sb->tlink_tree_lock);
3421 cifs_put_tlink(tlink);
3422 spin_lock(&cifs_sb->tlink_tree_lock);
3423 }
3424 spin_unlock(&cifs_sb->tlink_tree_lock);
3425
3426 bdi_destroy(&cifs_sb->bdi);
3427 kfree(cifs_sb->mountdata);
3428 unload_nls(cifs_sb->local_nls);
3429 kfree(cifs_sb);
3430 }
3431
3432 int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
3433 {
3434 int rc = 0;
3435 struct TCP_Server_Info *server = ses->server;
3436
3437 /* only send once per connect */
3438 if (server->maxBuf != 0)
3439 return 0;
3440
3441 rc = CIFSSMBNegotiate(xid, ses);
3442 if (rc == -EAGAIN) {
3443 /* retry only once on 1st time connection */
3444 rc = CIFSSMBNegotiate(xid, ses);
3445 if (rc == -EAGAIN)
3446 rc = -EHOSTDOWN;
3447 }
3448 if (rc == 0) {
3449 spin_lock(&GlobalMid_Lock);
3450 if (server->tcpStatus == CifsNeedNegotiate)
3451 server->tcpStatus = CifsGood;
3452 else
3453 rc = -EHOSTDOWN;
3454 spin_unlock(&GlobalMid_Lock);
3455
3456 }
3457
3458 return rc;
3459 }
3460
3461
3462 int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
3463 struct nls_table *nls_info)
3464 {
3465 int rc = 0;
3466 struct TCP_Server_Info *server = ses->server;
3467
3468 ses->flags = 0;
3469 ses->capabilities = server->capabilities;
3470 if (linuxExtEnabled == 0)
3471 ses->capabilities &= (~CAP_UNIX);
3472
3473 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3474 server->sec_mode, server->capabilities, server->timeAdj);
3475
3476 rc = CIFS_SessSetup(xid, ses, nls_info);
3477 if (rc) {
3478 cERROR(1, "Send error in SessSetup = %d", rc);
3479 } else {
3480 mutex_lock(&ses->server->srv_mutex);
3481 if (!server->session_estab) {
3482 server->session_key.response = ses->auth_key.response;
3483 server->session_key.len = ses->auth_key.len;
3484 server->sequence_number = 0x2;
3485 server->session_estab = true;
3486 ses->auth_key.response = NULL;
3487 }
3488 mutex_unlock(&server->srv_mutex);
3489
3490 cFYI(1, "CIFS Session Established successfully");
3491 spin_lock(&GlobalMid_Lock);
3492 ses->status = CifsGood;
3493 ses->need_reconnect = false;
3494 spin_unlock(&GlobalMid_Lock);
3495 }
3496
3497 kfree(ses->auth_key.response);
3498 ses->auth_key.response = NULL;
3499 ses->auth_key.len = 0;
3500 kfree(ses->ntlmssp);
3501 ses->ntlmssp = NULL;
3502
3503 return rc;
3504 }
3505
3506 static struct cifs_tcon *
3507 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3508 {
3509 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3510 struct cifs_ses *ses;
3511 struct cifs_tcon *tcon = NULL;
3512 struct smb_vol *vol_info;
3513 char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3514 /* We used to have this as MAX_USERNAME which is */
3515 /* way too big now (256 instead of 32) */
3516
3517 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3518 if (vol_info == NULL) {
3519 tcon = ERR_PTR(-ENOMEM);
3520 goto out;
3521 }
3522
3523 snprintf(username, sizeof(username), "krb50x%x", fsuid);
3524 vol_info->username = username;
3525 vol_info->local_nls = cifs_sb->local_nls;
3526 vol_info->linux_uid = fsuid;
3527 vol_info->cred_uid = fsuid;
3528 vol_info->UNC = master_tcon->treeName;
3529 vol_info->retry = master_tcon->retry;
3530 vol_info->nocase = master_tcon->nocase;
3531 vol_info->local_lease = master_tcon->local_lease;
3532 vol_info->no_linux_ext = !master_tcon->unix_ext;
3533
3534 /* FIXME: allow for other secFlg settings */
3535 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3536
3537 /* get a reference for the same TCP session */
3538 spin_lock(&cifs_tcp_ses_lock);
3539 ++master_tcon->ses->server->srv_count;
3540 spin_unlock(&cifs_tcp_ses_lock);
3541
3542 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3543 if (IS_ERR(ses)) {
3544 tcon = (struct cifs_tcon *)ses;
3545 cifs_put_tcp_session(master_tcon->ses->server);
3546 goto out;
3547 }
3548
3549 tcon = cifs_get_tcon(ses, vol_info);
3550 if (IS_ERR(tcon)) {
3551 cifs_put_smb_ses(ses);
3552 goto out;
3553 }
3554
3555 if (ses->capabilities & CAP_UNIX)
3556 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3557 out:
3558 kfree(vol_info);
3559
3560 return tcon;
3561 }
3562
3563 struct cifs_tcon *
3564 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3565 {
3566 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3567 }
3568
3569 static int
3570 cifs_sb_tcon_pending_wait(void *unused)
3571 {
3572 schedule();
3573 return signal_pending(current) ? -ERESTARTSYS : 0;
3574 }
3575
3576 /* find and return a tlink with given uid */
3577 static struct tcon_link *
3578 tlink_rb_search(struct rb_root *root, uid_t uid)
3579 {
3580 struct rb_node *node = root->rb_node;
3581 struct tcon_link *tlink;
3582
3583 while (node) {
3584 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3585
3586 if (tlink->tl_uid > uid)
3587 node = node->rb_left;
3588 else if (tlink->tl_uid < uid)
3589 node = node->rb_right;
3590 else
3591 return tlink;
3592 }
3593 return NULL;
3594 }
3595
3596 /* insert a tcon_link into the tree */
3597 static void
3598 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3599 {
3600 struct rb_node **new = &(root->rb_node), *parent = NULL;
3601 struct tcon_link *tlink;
3602
3603 while (*new) {
3604 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3605 parent = *new;
3606
3607 if (tlink->tl_uid > new_tlink->tl_uid)
3608 new = &((*new)->rb_left);
3609 else
3610 new = &((*new)->rb_right);
3611 }
3612
3613 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3614 rb_insert_color(&new_tlink->tl_rbnode, root);
3615 }
3616
3617 /*
3618 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3619 * current task.
3620 *
3621 * If the superblock doesn't refer to a multiuser mount, then just return
3622 * the master tcon for the mount.
3623 *
3624 * First, search the rbtree for an existing tcon for this fsuid. If one
3625 * exists, then check to see if it's pending construction. If it is then wait
3626 * for construction to complete. Once it's no longer pending, check to see if
3627 * it failed and either return an error or retry construction, depending on
3628 * the timeout.
3629 *
3630 * If one doesn't exist then insert a new tcon_link struct into the tree and
3631 * try to construct a new one.
3632 */
3633 struct tcon_link *
3634 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3635 {
3636 int ret;
3637 uid_t fsuid = current_fsuid();
3638 struct tcon_link *tlink, *newtlink;
3639
3640 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3641 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3642
3643 spin_lock(&cifs_sb->tlink_tree_lock);
3644 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3645 if (tlink)
3646 cifs_get_tlink(tlink);
3647 spin_unlock(&cifs_sb->tlink_tree_lock);
3648
3649 if (tlink == NULL) {
3650 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3651 if (newtlink == NULL)
3652 return ERR_PTR(-ENOMEM);
3653 newtlink->tl_uid = fsuid;
3654 newtlink->tl_tcon = ERR_PTR(-EACCES);
3655 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3656 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3657 cifs_get_tlink(newtlink);
3658
3659 spin_lock(&cifs_sb->tlink_tree_lock);
3660 /* was one inserted after previous search? */
3661 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3662 if (tlink) {
3663 cifs_get_tlink(tlink);
3664 spin_unlock(&cifs_sb->tlink_tree_lock);
3665 kfree(newtlink);
3666 goto wait_for_construction;
3667 }
3668 tlink = newtlink;
3669 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3670 spin_unlock(&cifs_sb->tlink_tree_lock);
3671 } else {
3672 wait_for_construction:
3673 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3674 cifs_sb_tcon_pending_wait,
3675 TASK_INTERRUPTIBLE);
3676 if (ret) {
3677 cifs_put_tlink(tlink);
3678 return ERR_PTR(ret);
3679 }
3680
3681 /* if it's good, return it */
3682 if (!IS_ERR(tlink->tl_tcon))
3683 return tlink;
3684
3685 /* return error if we tried this already recently */
3686 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3687 cifs_put_tlink(tlink);
3688 return ERR_PTR(-EACCES);
3689 }
3690
3691 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3692 goto wait_for_construction;
3693 }
3694
3695 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3696 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3697 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3698
3699 if (IS_ERR(tlink->tl_tcon)) {
3700 cifs_put_tlink(tlink);
3701 return ERR_PTR(-EACCES);
3702 }
3703
3704 return tlink;
3705 }
3706
3707 /*
3708 * periodic workqueue job that scans tcon_tree for a superblock and closes
3709 * out tcons.
3710 */
3711 static void
3712 cifs_prune_tlinks(struct work_struct *work)
3713 {
3714 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3715 prune_tlinks.work);
3716 struct rb_root *root = &cifs_sb->tlink_tree;
3717 struct rb_node *node = rb_first(root);
3718 struct rb_node *tmp;
3719 struct tcon_link *tlink;
3720
3721 /*
3722 * Because we drop the spinlock in the loop in order to put the tlink
3723 * it's not guarded against removal of links from the tree. The only
3724 * places that remove entries from the tree are this function and
3725 * umounts. Because this function is non-reentrant and is canceled
3726 * before umount can proceed, this is safe.
3727 */
3728 spin_lock(&cifs_sb->tlink_tree_lock);
3729 node = rb_first(root);
3730 while (node != NULL) {
3731 tmp = node;
3732 node = rb_next(tmp);
3733 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3734
3735 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3736 atomic_read(&tlink->tl_count) != 0 ||
3737 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3738 continue;
3739
3740 cifs_get_tlink(tlink);
3741 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3742 rb_erase(tmp, root);
3743
3744 spin_unlock(&cifs_sb->tlink_tree_lock);
3745 cifs_put_tlink(tlink);
3746 spin_lock(&cifs_sb->tlink_tree_lock);
3747 }
3748 spin_unlock(&cifs_sb->tlink_tree_lock);
3749
3750 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3751 TLINK_IDLE_EXPIRE);
3752 }
Linux Btrfs Development