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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
58extern 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
64static int ip_connect(struct TCP_Server_Info *server);
65static int generic_ip_connect(struct TCP_Server_Info *server);
66static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
67static void cifs_prune_tlinks(struct work_struct *work);
68static 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 */
79static int
80cifs_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 */
184static 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
225static 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
297static void
298cifs_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
318requeue_echo:
319 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
320}
321
322static bool
323allocate_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
361static int
362read_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
419static bool
420check_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
476static struct mid_q_entry *
477find_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;
517multi_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
534static 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
629static int
630cifs_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
672incomplete_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 */
797static char *
798extract_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
824static int
825cifs_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
1501cifs_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 */
1510static bool
1511srcip_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 */
1537static bool
1538match_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
1567static bool
1568match_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
1604static bool
1605match_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
1652static 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
1671static struct TCP_Server_Info *
1672cifs_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
1690static void
1691cifs_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
1724static struct TCP_Server_Info *
1725cifs_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
1856out_err_crypto_release:
1857 cifs_crypto_shash_release(tcp_ses);
1858
1859 put_net(cifs_net_ns(tcp_ses));
1860
1861out_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
1872static 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
1896static struct cifs_ses *
1897cifs_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
1913static void
1914cifs_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
1938static bool warned_on_ntlm; /* globals init to false automatically */
1939
1940static struct cifs_ses *
1941cifs_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
2041get_ses_fail:
2042 sesInfoFree(ses);
2043 FreeXid(xid);
2044 return ERR_PTR(rc);
2045}
2046
2047static 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
2056static struct cifs_tcon *
2057cifs_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
2075static void
2076cifs_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
2100static struct cifs_tcon *
2101cifs_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
2170out_fail:
2171 tconInfoFree(tcon);
2172 return ERR_PTR(rc);
2173}
2174
2175void
2176cifs_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
2193static inline struct tcon_link *
2194cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2195{
2196 return cifs_sb->master_tlink;
2197}
2198
2199static int
2200compare_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
2238int
2239cifs_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);
2284out:
2285 spin_unlock(&cifs_tcp_ses_lock);
2286 cifs_put_tlink(tlink);
2287 return rc;
2288}
2289
2290int
2291get_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
2327static struct lock_class_key cifs_key[2];
2328static struct lock_class_key cifs_slock_key[2];
2329
2330static inline void
2331cifs_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
2339static inline void
2340cifs_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
2348static inline void
2349cifs_reclassify_socket4(struct socket *sock)
2350{
2351}
2352
2353static inline void
2354cifs_reclassify_socket6(struct socket *sock)
2355{
2356}
2357#endif
2358
2359/* See RFC1001 section 14 on representation of Netbios names */
2360static 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
2373static int
2374bind_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
2401static int
2402ip_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
2475static int
2476generic_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
2561static int
2562ip_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
2590void 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
2703void 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
2822static unsigned int
2823cifs_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
2851static int
2852is_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
2875static void
2876cleanup_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
2888void
2889cifs_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) */
2901static char *
2902build_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 */
2937static int
2938expand_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
2985static int
2986cifs_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
3025struct smb_vol *
3026cifs_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
3044int
3045cifs_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
3065try_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
3138remote_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
3224mount_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
3238out:
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 */
3247int
3248CIFSTCon(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
3404void
3405cifs_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
3432int 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
3462int 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
3506static struct cifs_tcon *
3507cifs_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);
3557out:
3558 kfree(vol_info);
3559
3560 return tcon;
3561}
3562
3563struct cifs_tcon *
3564cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3565{
3566 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3567}
3568
3569static int
3570cifs_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 */
3577static struct tcon_link *
3578tlink_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 */
3597static void
3598tlink_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 */
3633struct tcon_link *
3634cifs_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 {
3672wait_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 */
3711static void
3712cifs_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}
1/*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
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 <linux/module.h>
41#include <keys/user-type.h>
42#include <net/ipv6.h>
43#include <linux/parser.h>
44
45#include "cifspdu.h"
46#include "cifsglob.h"
47#include "cifsproto.h"
48#include "cifs_unicode.h"
49#include "cifs_debug.h"
50#include "cifs_fs_sb.h"
51#include "ntlmssp.h"
52#include "nterr.h"
53#include "rfc1002pdu.h"
54#include "fscache.h"
55
56#define CIFS_PORT 445
57#define RFC1001_PORT 139
58
59extern mempool_t *cifs_req_poolp;
60
61/* FIXME: should these be tunable? */
62#define TLINK_ERROR_EXPIRE (1 * HZ)
63#define TLINK_IDLE_EXPIRE (600 * HZ)
64
65enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapposix, Opt_nomapposix,
74 Opt_mapchars, Opt_nomapchars, Opt_sfu,
75 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
76 Opt_noposixpaths, Opt_nounix,
77 Opt_nocase,
78 Opt_brl, Opt_nobrl,
79 Opt_forcemandatorylock, Opt_setuids,
80 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
81 Opt_nohard, Opt_nosoft,
82 Opt_nointr, Opt_intr,
83 Opt_nostrictsync, Opt_strictsync,
84 Opt_serverino, Opt_noserverino,
85 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
86 Opt_acl, Opt_noacl, Opt_locallease,
87 Opt_sign, Opt_seal, Opt_noac,
88 Opt_fsc, Opt_mfsymlinks,
89 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
90 Opt_persistent, Opt_nopersistent,
91 Opt_resilient, Opt_noresilient,
92
93 /* Mount options which take numeric value */
94 Opt_backupuid, Opt_backupgid, Opt_uid,
95 Opt_cruid, Opt_gid, Opt_file_mode,
96 Opt_dirmode, Opt_port,
97 Opt_rsize, Opt_wsize, Opt_actimeo,
98 Opt_echo_interval,
99
100 /* Mount options which take string value */
101 Opt_user, Opt_pass, Opt_ip,
102 Opt_domain, Opt_srcaddr, Opt_iocharset,
103 Opt_netbiosname, Opt_servern,
104 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
105
106 /* Mount options to be ignored */
107 Opt_ignore,
108
109 /* Options which could be blank */
110 Opt_blank_pass,
111 Opt_blank_user,
112 Opt_blank_ip,
113
114 Opt_err
115};
116
117static const match_table_t cifs_mount_option_tokens = {
118
119 { Opt_user_xattr, "user_xattr" },
120 { Opt_nouser_xattr, "nouser_xattr" },
121 { Opt_forceuid, "forceuid" },
122 { Opt_noforceuid, "noforceuid" },
123 { Opt_forcegid, "forcegid" },
124 { Opt_noforcegid, "noforcegid" },
125 { Opt_noblocksend, "noblocksend" },
126 { Opt_noautotune, "noautotune" },
127 { Opt_hard, "hard" },
128 { Opt_soft, "soft" },
129 { Opt_perm, "perm" },
130 { Opt_noperm, "noperm" },
131 { Opt_mapchars, "mapchars" }, /* SFU style */
132 { Opt_nomapchars, "nomapchars" },
133 { Opt_mapposix, "mapposix" }, /* SFM style */
134 { Opt_nomapposix, "nomapposix" },
135 { Opt_sfu, "sfu" },
136 { Opt_nosfu, "nosfu" },
137 { Opt_nodfs, "nodfs" },
138 { Opt_posixpaths, "posixpaths" },
139 { Opt_noposixpaths, "noposixpaths" },
140 { Opt_nounix, "nounix" },
141 { Opt_nounix, "nolinux" },
142 { Opt_nocase, "nocase" },
143 { Opt_nocase, "ignorecase" },
144 { Opt_brl, "brl" },
145 { Opt_nobrl, "nobrl" },
146 { Opt_nobrl, "nolock" },
147 { Opt_forcemandatorylock, "forcemandatorylock" },
148 { Opt_forcemandatorylock, "forcemand" },
149 { Opt_setuids, "setuids" },
150 { Opt_nosetuids, "nosetuids" },
151 { Opt_dynperm, "dynperm" },
152 { Opt_nodynperm, "nodynperm" },
153 { Opt_nohard, "nohard" },
154 { Opt_nosoft, "nosoft" },
155 { Opt_nointr, "nointr" },
156 { Opt_intr, "intr" },
157 { Opt_nostrictsync, "nostrictsync" },
158 { Opt_strictsync, "strictsync" },
159 { Opt_serverino, "serverino" },
160 { Opt_noserverino, "noserverino" },
161 { Opt_rwpidforward, "rwpidforward" },
162 { Opt_cifsacl, "cifsacl" },
163 { Opt_nocifsacl, "nocifsacl" },
164 { Opt_acl, "acl" },
165 { Opt_noacl, "noacl" },
166 { Opt_locallease, "locallease" },
167 { Opt_sign, "sign" },
168 { Opt_seal, "seal" },
169 { Opt_noac, "noac" },
170 { Opt_fsc, "fsc" },
171 { Opt_mfsymlinks, "mfsymlinks" },
172 { Opt_multiuser, "multiuser" },
173 { Opt_sloppy, "sloppy" },
174 { Opt_nosharesock, "nosharesock" },
175 { Opt_persistent, "persistenthandles"},
176 { Opt_nopersistent, "nopersistenthandles"},
177 { Opt_resilient, "resilienthandles"},
178 { Opt_noresilient, "noresilienthandles"},
179
180 { Opt_backupuid, "backupuid=%s" },
181 { Opt_backupgid, "backupgid=%s" },
182 { Opt_uid, "uid=%s" },
183 { Opt_cruid, "cruid=%s" },
184 { Opt_gid, "gid=%s" },
185 { Opt_file_mode, "file_mode=%s" },
186 { Opt_dirmode, "dirmode=%s" },
187 { Opt_dirmode, "dir_mode=%s" },
188 { Opt_port, "port=%s" },
189 { Opt_rsize, "rsize=%s" },
190 { Opt_wsize, "wsize=%s" },
191 { Opt_actimeo, "actimeo=%s" },
192 { Opt_echo_interval, "echo_interval=%s" },
193
194 { Opt_blank_user, "user=" },
195 { Opt_blank_user, "username=" },
196 { Opt_user, "user=%s" },
197 { Opt_user, "username=%s" },
198 { Opt_blank_pass, "pass=" },
199 { Opt_blank_pass, "password=" },
200 { Opt_pass, "pass=%s" },
201 { Opt_pass, "password=%s" },
202 { Opt_blank_ip, "ip=" },
203 { Opt_blank_ip, "addr=" },
204 { Opt_ip, "ip=%s" },
205 { Opt_ip, "addr=%s" },
206 { Opt_ignore, "unc=%s" },
207 { Opt_ignore, "target=%s" },
208 { Opt_ignore, "path=%s" },
209 { Opt_domain, "dom=%s" },
210 { Opt_domain, "domain=%s" },
211 { Opt_domain, "workgroup=%s" },
212 { Opt_srcaddr, "srcaddr=%s" },
213 { Opt_ignore, "prefixpath=%s" },
214 { Opt_iocharset, "iocharset=%s" },
215 { Opt_netbiosname, "netbiosname=%s" },
216 { Opt_servern, "servern=%s" },
217 { Opt_ver, "ver=%s" },
218 { Opt_vers, "vers=%s" },
219 { Opt_sec, "sec=%s" },
220 { Opt_cache, "cache=%s" },
221
222 { Opt_ignore, "cred" },
223 { Opt_ignore, "credentials" },
224 { Opt_ignore, "cred=%s" },
225 { Opt_ignore, "credentials=%s" },
226 { Opt_ignore, "guest" },
227 { Opt_ignore, "rw" },
228 { Opt_ignore, "ro" },
229 { Opt_ignore, "suid" },
230 { Opt_ignore, "nosuid" },
231 { Opt_ignore, "exec" },
232 { Opt_ignore, "noexec" },
233 { Opt_ignore, "nodev" },
234 { Opt_ignore, "noauto" },
235 { Opt_ignore, "dev" },
236 { Opt_ignore, "mand" },
237 { Opt_ignore, "nomand" },
238 { Opt_ignore, "_netdev" },
239
240 { Opt_err, NULL }
241};
242
243enum {
244 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
245 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
246 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
247 Opt_sec_ntlmv2i, Opt_sec_lanman,
248 Opt_sec_none,
249
250 Opt_sec_err
251};
252
253static const match_table_t cifs_secflavor_tokens = {
254 { Opt_sec_krb5, "krb5" },
255 { Opt_sec_krb5i, "krb5i" },
256 { Opt_sec_krb5p, "krb5p" },
257 { Opt_sec_ntlmsspi, "ntlmsspi" },
258 { Opt_sec_ntlmssp, "ntlmssp" },
259 { Opt_ntlm, "ntlm" },
260 { Opt_sec_ntlmi, "ntlmi" },
261 { Opt_sec_ntlmv2, "nontlm" },
262 { Opt_sec_ntlmv2, "ntlmv2" },
263 { Opt_sec_ntlmv2i, "ntlmv2i" },
264 { Opt_sec_lanman, "lanman" },
265 { Opt_sec_none, "none" },
266
267 { Opt_sec_err, NULL }
268};
269
270/* cache flavors */
271enum {
272 Opt_cache_loose,
273 Opt_cache_strict,
274 Opt_cache_none,
275 Opt_cache_err
276};
277
278static const match_table_t cifs_cacheflavor_tokens = {
279 { Opt_cache_loose, "loose" },
280 { Opt_cache_strict, "strict" },
281 { Opt_cache_none, "none" },
282 { Opt_cache_err, NULL }
283};
284
285static const match_table_t cifs_smb_version_tokens = {
286 { Smb_1, SMB1_VERSION_STRING },
287 { Smb_20, SMB20_VERSION_STRING},
288 { Smb_21, SMB21_VERSION_STRING },
289 { Smb_30, SMB30_VERSION_STRING },
290 { Smb_302, SMB302_VERSION_STRING },
291#ifdef CONFIG_CIFS_SMB311
292 { Smb_311, SMB311_VERSION_STRING },
293 { Smb_311, ALT_SMB311_VERSION_STRING },
294#endif /* SMB311 */
295 { Smb_version_err, NULL }
296};
297
298static int ip_connect(struct TCP_Server_Info *server);
299static int generic_ip_connect(struct TCP_Server_Info *server);
300static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
301static void cifs_prune_tlinks(struct work_struct *work);
302static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
303 const char *devname);
304
305/*
306 * cifs tcp session reconnection
307 *
308 * mark tcp session as reconnecting so temporarily locked
309 * mark all smb sessions as reconnecting for tcp session
310 * reconnect tcp session
311 * wake up waiters on reconnection? - (not needed currently)
312 */
313int
314cifs_reconnect(struct TCP_Server_Info *server)
315{
316 int rc = 0;
317 struct list_head *tmp, *tmp2;
318 struct cifs_ses *ses;
319 struct cifs_tcon *tcon;
320 struct mid_q_entry *mid_entry;
321 struct list_head retry_list;
322
323 spin_lock(&GlobalMid_Lock);
324 if (server->tcpStatus == CifsExiting) {
325 /* the demux thread will exit normally
326 next time through the loop */
327 spin_unlock(&GlobalMid_Lock);
328 return rc;
329 } else
330 server->tcpStatus = CifsNeedReconnect;
331 spin_unlock(&GlobalMid_Lock);
332 server->maxBuf = 0;
333#ifdef CONFIG_CIFS_SMB2
334 server->max_read = 0;
335#endif
336
337 cifs_dbg(FYI, "Reconnecting tcp session\n");
338
339 /* before reconnecting the tcp session, mark the smb session (uid)
340 and the tid bad so they are not used until reconnected */
341 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
342 __func__);
343 spin_lock(&cifs_tcp_ses_lock);
344 list_for_each(tmp, &server->smb_ses_list) {
345 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
346 ses->need_reconnect = true;
347 ses->ipc_tid = 0;
348 list_for_each(tmp2, &ses->tcon_list) {
349 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
350 tcon->need_reconnect = true;
351 }
352 }
353 spin_unlock(&cifs_tcp_ses_lock);
354
355 /* do not want to be sending data on a socket we are freeing */
356 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
357 mutex_lock(&server->srv_mutex);
358 if (server->ssocket) {
359 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
360 server->ssocket->state, server->ssocket->flags);
361 kernel_sock_shutdown(server->ssocket, SHUT_WR);
362 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
363 server->ssocket->state, server->ssocket->flags);
364 sock_release(server->ssocket);
365 server->ssocket = NULL;
366 }
367 server->sequence_number = 0;
368 server->session_estab = false;
369 kfree(server->session_key.response);
370 server->session_key.response = NULL;
371 server->session_key.len = 0;
372 server->lstrp = jiffies;
373
374 /* mark submitted MIDs for retry and issue callback */
375 INIT_LIST_HEAD(&retry_list);
376 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
377 spin_lock(&GlobalMid_Lock);
378 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
379 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
380 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
381 mid_entry->mid_state = MID_RETRY_NEEDED;
382 list_move(&mid_entry->qhead, &retry_list);
383 }
384 spin_unlock(&GlobalMid_Lock);
385 mutex_unlock(&server->srv_mutex);
386
387 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
388 list_for_each_safe(tmp, tmp2, &retry_list) {
389 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
390 list_del_init(&mid_entry->qhead);
391 mid_entry->callback(mid_entry);
392 }
393
394 do {
395 try_to_freeze();
396
397 /* we should try only the port we connected to before */
398 mutex_lock(&server->srv_mutex);
399 rc = generic_ip_connect(server);
400 if (rc) {
401 cifs_dbg(FYI, "reconnect error %d\n", rc);
402 mutex_unlock(&server->srv_mutex);
403 msleep(3000);
404 } else {
405 atomic_inc(&tcpSesReconnectCount);
406 spin_lock(&GlobalMid_Lock);
407 if (server->tcpStatus != CifsExiting)
408 server->tcpStatus = CifsNeedNegotiate;
409 spin_unlock(&GlobalMid_Lock);
410 mutex_unlock(&server->srv_mutex);
411 }
412 } while (server->tcpStatus == CifsNeedReconnect);
413
414 return rc;
415}
416
417static void
418cifs_echo_request(struct work_struct *work)
419{
420 int rc;
421 struct TCP_Server_Info *server = container_of(work,
422 struct TCP_Server_Info, echo.work);
423 unsigned long echo_interval = server->echo_interval;
424
425 /*
426 * We cannot send an echo if it is disabled or until the
427 * NEGOTIATE_PROTOCOL request is done, which is indicated by
428 * server->ops->need_neg() == true. Also, no need to ping if
429 * we got a response recently.
430 */
431 if (!server->ops->need_neg || server->ops->need_neg(server) ||
432 (server->ops->can_echo && !server->ops->can_echo(server)) ||
433 time_before(jiffies, server->lstrp + echo_interval - HZ))
434 goto requeue_echo;
435
436 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
437 if (rc)
438 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
439 server->hostname);
440
441requeue_echo:
442 queue_delayed_work(cifsiod_wq, &server->echo, echo_interval);
443}
444
445static bool
446allocate_buffers(struct TCP_Server_Info *server)
447{
448 if (!server->bigbuf) {
449 server->bigbuf = (char *)cifs_buf_get();
450 if (!server->bigbuf) {
451 cifs_dbg(VFS, "No memory for large SMB response\n");
452 msleep(3000);
453 /* retry will check if exiting */
454 return false;
455 }
456 } else if (server->large_buf) {
457 /* we are reusing a dirty large buf, clear its start */
458 memset(server->bigbuf, 0, HEADER_SIZE(server));
459 }
460
461 if (!server->smallbuf) {
462 server->smallbuf = (char *)cifs_small_buf_get();
463 if (!server->smallbuf) {
464 cifs_dbg(VFS, "No memory for SMB response\n");
465 msleep(1000);
466 /* retry will check if exiting */
467 return false;
468 }
469 /* beginning of smb buffer is cleared in our buf_get */
470 } else {
471 /* if existing small buf clear beginning */
472 memset(server->smallbuf, 0, HEADER_SIZE(server));
473 }
474
475 return true;
476}
477
478static bool
479server_unresponsive(struct TCP_Server_Info *server)
480{
481 /*
482 * We need to wait 2 echo intervals to make sure we handle such
483 * situations right:
484 * 1s client sends a normal SMB request
485 * 2s client gets a response
486 * 30s echo workqueue job pops, and decides we got a response recently
487 * and don't need to send another
488 * ...
489 * 65s kernel_recvmsg times out, and we see that we haven't gotten
490 * a response in >60s.
491 */
492 if (server->tcpStatus == CifsGood &&
493 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
494 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
495 server->hostname, (2 * server->echo_interval) / HZ);
496 cifs_reconnect(server);
497 wake_up(&server->response_q);
498 return true;
499 }
500
501 return false;
502}
503
504/*
505 * kvec_array_init - clone a kvec array, and advance into it
506 * @new: pointer to memory for cloned array
507 * @iov: pointer to original array
508 * @nr_segs: number of members in original array
509 * @bytes: number of bytes to advance into the cloned array
510 *
511 * This function will copy the array provided in iov to a section of memory
512 * and advance the specified number of bytes into the new array. It returns
513 * the number of segments in the new array. "new" must be at least as big as
514 * the original iov array.
515 */
516static unsigned int
517kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
518 size_t bytes)
519{
520 size_t base = 0;
521
522 while (bytes || !iov->iov_len) {
523 int copy = min(bytes, iov->iov_len);
524
525 bytes -= copy;
526 base += copy;
527 if (iov->iov_len == base) {
528 iov++;
529 nr_segs--;
530 base = 0;
531 }
532 }
533 memcpy(new, iov, sizeof(*iov) * nr_segs);
534 new->iov_base += base;
535 new->iov_len -= base;
536 return nr_segs;
537}
538
539static struct kvec *
540get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
541{
542 struct kvec *new_iov;
543
544 if (server->iov && nr_segs <= server->nr_iov)
545 return server->iov;
546
547 /* not big enough -- allocate a new one and release the old */
548 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
549 if (new_iov) {
550 kfree(server->iov);
551 server->iov = new_iov;
552 server->nr_iov = nr_segs;
553 }
554 return new_iov;
555}
556
557int
558cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
559 unsigned int nr_segs, unsigned int to_read)
560{
561 int length = 0;
562 int total_read;
563 unsigned int segs;
564 struct msghdr smb_msg;
565 struct kvec *iov;
566
567 iov = get_server_iovec(server, nr_segs);
568 if (!iov)
569 return -ENOMEM;
570
571 smb_msg.msg_control = NULL;
572 smb_msg.msg_controllen = 0;
573
574 for (total_read = 0; to_read; total_read += length, to_read -= length) {
575 try_to_freeze();
576
577 if (server_unresponsive(server)) {
578 total_read = -ECONNABORTED;
579 break;
580 }
581
582 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
583
584 length = kernel_recvmsg(server->ssocket, &smb_msg,
585 iov, segs, to_read, 0);
586
587 if (server->tcpStatus == CifsExiting) {
588 total_read = -ESHUTDOWN;
589 break;
590 } else if (server->tcpStatus == CifsNeedReconnect) {
591 cifs_reconnect(server);
592 total_read = -ECONNABORTED;
593 break;
594 } else if (length == -ERESTARTSYS ||
595 length == -EAGAIN ||
596 length == -EINTR) {
597 /*
598 * Minimum sleep to prevent looping, allowing socket
599 * to clear and app threads to set tcpStatus
600 * CifsNeedReconnect if server hung.
601 */
602 usleep_range(1000, 2000);
603 length = 0;
604 continue;
605 } else if (length <= 0) {
606 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
607 "got %d", to_read, length);
608 cifs_reconnect(server);
609 total_read = -ECONNABORTED;
610 break;
611 }
612 }
613 return total_read;
614}
615
616int
617cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
618 unsigned int to_read)
619{
620 struct kvec iov;
621
622 iov.iov_base = buf;
623 iov.iov_len = to_read;
624
625 return cifs_readv_from_socket(server, &iov, 1, to_read);
626}
627
628static bool
629is_smb_response(struct TCP_Server_Info *server, unsigned char type)
630{
631 /*
632 * The first byte big endian of the length field,
633 * is actually not part of the length but the type
634 * with the most common, zero, as regular data.
635 */
636 switch (type) {
637 case RFC1002_SESSION_MESSAGE:
638 /* Regular SMB response */
639 return true;
640 case RFC1002_SESSION_KEEP_ALIVE:
641 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
642 break;
643 case RFC1002_POSITIVE_SESSION_RESPONSE:
644 cifs_dbg(FYI, "RFC 1002 positive session response\n");
645 break;
646 case RFC1002_NEGATIVE_SESSION_RESPONSE:
647 /*
648 * We get this from Windows 98 instead of an error on
649 * SMB negprot response.
650 */
651 cifs_dbg(FYI, "RFC 1002 negative session response\n");
652 /* give server a second to clean up */
653 msleep(1000);
654 /*
655 * Always try 445 first on reconnect since we get NACK
656 * on some if we ever connected to port 139 (the NACK
657 * is since we do not begin with RFC1001 session
658 * initialize frame).
659 */
660 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
661 cifs_reconnect(server);
662 wake_up(&server->response_q);
663 break;
664 default:
665 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
666 cifs_reconnect(server);
667 }
668
669 return false;
670}
671
672void
673dequeue_mid(struct mid_q_entry *mid, bool malformed)
674{
675#ifdef CONFIG_CIFS_STATS2
676 mid->when_received = jiffies;
677#endif
678 spin_lock(&GlobalMid_Lock);
679 if (!malformed)
680 mid->mid_state = MID_RESPONSE_RECEIVED;
681 else
682 mid->mid_state = MID_RESPONSE_MALFORMED;
683 list_del_init(&mid->qhead);
684 spin_unlock(&GlobalMid_Lock);
685}
686
687static void
688handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
689 char *buf, int malformed)
690{
691 if (server->ops->check_trans2 &&
692 server->ops->check_trans2(mid, server, buf, malformed))
693 return;
694 mid->resp_buf = buf;
695 mid->large_buf = server->large_buf;
696 /* Was previous buf put in mpx struct for multi-rsp? */
697 if (!mid->multiRsp) {
698 /* smb buffer will be freed by user thread */
699 if (server->large_buf)
700 server->bigbuf = NULL;
701 else
702 server->smallbuf = NULL;
703 }
704 dequeue_mid(mid, malformed);
705}
706
707static void clean_demultiplex_info(struct TCP_Server_Info *server)
708{
709 int length;
710
711 /* take it off the list, if it's not already */
712 spin_lock(&cifs_tcp_ses_lock);
713 list_del_init(&server->tcp_ses_list);
714 spin_unlock(&cifs_tcp_ses_lock);
715
716 spin_lock(&GlobalMid_Lock);
717 server->tcpStatus = CifsExiting;
718 spin_unlock(&GlobalMid_Lock);
719 wake_up_all(&server->response_q);
720
721 /* check if we have blocked requests that need to free */
722 spin_lock(&server->req_lock);
723 if (server->credits <= 0)
724 server->credits = 1;
725 spin_unlock(&server->req_lock);
726 /*
727 * Although there should not be any requests blocked on this queue it
728 * can not hurt to be paranoid and try to wake up requests that may
729 * haven been blocked when more than 50 at time were on the wire to the
730 * same server - they now will see the session is in exit state and get
731 * out of SendReceive.
732 */
733 wake_up_all(&server->request_q);
734 /* give those requests time to exit */
735 msleep(125);
736
737 if (server->ssocket) {
738 sock_release(server->ssocket);
739 server->ssocket = NULL;
740 }
741
742 if (!list_empty(&server->pending_mid_q)) {
743 struct list_head dispose_list;
744 struct mid_q_entry *mid_entry;
745 struct list_head *tmp, *tmp2;
746
747 INIT_LIST_HEAD(&dispose_list);
748 spin_lock(&GlobalMid_Lock);
749 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
750 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
751 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
752 mid_entry->mid_state = MID_SHUTDOWN;
753 list_move(&mid_entry->qhead, &dispose_list);
754 }
755 spin_unlock(&GlobalMid_Lock);
756
757 /* now walk dispose list and issue callbacks */
758 list_for_each_safe(tmp, tmp2, &dispose_list) {
759 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
760 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
761 list_del_init(&mid_entry->qhead);
762 mid_entry->callback(mid_entry);
763 }
764 /* 1/8th of sec is more than enough time for them to exit */
765 msleep(125);
766 }
767
768 if (!list_empty(&server->pending_mid_q)) {
769 /*
770 * mpx threads have not exited yet give them at least the smb
771 * send timeout time for long ops.
772 *
773 * Due to delays on oplock break requests, we need to wait at
774 * least 45 seconds before giving up on a request getting a
775 * response and going ahead and killing cifsd.
776 */
777 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
778 msleep(46000);
779 /*
780 * If threads still have not exited they are probably never
781 * coming home not much else we can do but free the memory.
782 */
783 }
784
785 kfree(server->hostname);
786 kfree(server->iov);
787 kfree(server);
788
789 length = atomic_dec_return(&tcpSesAllocCount);
790 if (length > 0)
791 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
792}
793
794static int
795standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
796{
797 int length;
798 char *buf = server->smallbuf;
799 unsigned int pdu_length = get_rfc1002_length(buf);
800
801 /* make sure this will fit in a large buffer */
802 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
803 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
804 cifs_reconnect(server);
805 wake_up(&server->response_q);
806 return -ECONNABORTED;
807 }
808
809 /* switch to large buffer if too big for a small one */
810 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
811 server->large_buf = true;
812 memcpy(server->bigbuf, buf, server->total_read);
813 buf = server->bigbuf;
814 }
815
816 /* now read the rest */
817 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
818 pdu_length - HEADER_SIZE(server) + 1 + 4);
819 if (length < 0)
820 return length;
821 server->total_read += length;
822
823 dump_smb(buf, server->total_read);
824
825 /*
826 * We know that we received enough to get to the MID as we
827 * checked the pdu_length earlier. Now check to see
828 * if the rest of the header is OK. We borrow the length
829 * var for the rest of the loop to avoid a new stack var.
830 *
831 * 48 bytes is enough to display the header and a little bit
832 * into the payload for debugging purposes.
833 */
834 length = server->ops->check_message(buf, server->total_read, server);
835 if (length != 0)
836 cifs_dump_mem("Bad SMB: ", buf,
837 min_t(unsigned int, server->total_read, 48));
838
839 if (server->ops->is_status_pending &&
840 server->ops->is_status_pending(buf, server, length))
841 return -1;
842
843 if (!mid)
844 return length;
845
846 handle_mid(mid, server, buf, length);
847 return 0;
848}
849
850static int
851cifs_demultiplex_thread(void *p)
852{
853 int length;
854 struct TCP_Server_Info *server = p;
855 unsigned int pdu_length;
856 char *buf = NULL;
857 struct task_struct *task_to_wake = NULL;
858 struct mid_q_entry *mid_entry;
859
860 current->flags |= PF_MEMALLOC;
861 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
862
863 length = atomic_inc_return(&tcpSesAllocCount);
864 if (length > 1)
865 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
866
867 set_freezable();
868 while (server->tcpStatus != CifsExiting) {
869 if (try_to_freeze())
870 continue;
871
872 if (!allocate_buffers(server))
873 continue;
874
875 server->large_buf = false;
876 buf = server->smallbuf;
877 pdu_length = 4; /* enough to get RFC1001 header */
878
879 length = cifs_read_from_socket(server, buf, pdu_length);
880 if (length < 0)
881 continue;
882 server->total_read = length;
883
884 /*
885 * The right amount was read from socket - 4 bytes,
886 * so we can now interpret the length field.
887 */
888 pdu_length = get_rfc1002_length(buf);
889
890 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
891 if (!is_smb_response(server, buf[0]))
892 continue;
893
894 /* make sure we have enough to get to the MID */
895 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
896 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
897 pdu_length);
898 cifs_reconnect(server);
899 wake_up(&server->response_q);
900 continue;
901 }
902
903 /* read down to the MID */
904 length = cifs_read_from_socket(server, buf + 4,
905 HEADER_SIZE(server) - 1 - 4);
906 if (length < 0)
907 continue;
908 server->total_read += length;
909
910 mid_entry = server->ops->find_mid(server, buf);
911
912 if (!mid_entry || !mid_entry->receive)
913 length = standard_receive3(server, mid_entry);
914 else
915 length = mid_entry->receive(server, mid_entry);
916
917 if (length < 0)
918 continue;
919
920 if (server->large_buf)
921 buf = server->bigbuf;
922
923 server->lstrp = jiffies;
924 if (mid_entry != NULL) {
925 if (!mid_entry->multiRsp || mid_entry->multiEnd)
926 mid_entry->callback(mid_entry);
927 } else if (!server->ops->is_oplock_break ||
928 !server->ops->is_oplock_break(buf, server)) {
929 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
930 atomic_read(&midCount));
931 cifs_dump_mem("Received Data is: ", buf,
932 HEADER_SIZE(server));
933#ifdef CONFIG_CIFS_DEBUG2
934 if (server->ops->dump_detail)
935 server->ops->dump_detail(buf);
936 cifs_dump_mids(server);
937#endif /* CIFS_DEBUG2 */
938
939 }
940 } /* end while !EXITING */
941
942 /* buffer usually freed in free_mid - need to free it here on exit */
943 cifs_buf_release(server->bigbuf);
944 if (server->smallbuf) /* no sense logging a debug message if NULL */
945 cifs_small_buf_release(server->smallbuf);
946
947 task_to_wake = xchg(&server->tsk, NULL);
948 clean_demultiplex_info(server);
949
950 /* if server->tsk was NULL then wait for a signal before exiting */
951 if (!task_to_wake) {
952 set_current_state(TASK_INTERRUPTIBLE);
953 while (!signal_pending(current)) {
954 schedule();
955 set_current_state(TASK_INTERRUPTIBLE);
956 }
957 set_current_state(TASK_RUNNING);
958 }
959
960 module_put_and_exit(0);
961}
962
963/* extract the host portion of the UNC string */
964static char *
965extract_hostname(const char *unc)
966{
967 const char *src;
968 char *dst, *delim;
969 unsigned int len;
970
971 /* skip double chars at beginning of string */
972 /* BB: check validity of these bytes? */
973 src = unc + 2;
974
975 /* delimiter between hostname and sharename is always '\\' now */
976 delim = strchr(src, '\\');
977 if (!delim)
978 return ERR_PTR(-EINVAL);
979
980 len = delim - src;
981 dst = kmalloc((len + 1), GFP_KERNEL);
982 if (dst == NULL)
983 return ERR_PTR(-ENOMEM);
984
985 memcpy(dst, src, len);
986 dst[len] = '\0';
987
988 return dst;
989}
990
991static int get_option_ul(substring_t args[], unsigned long *option)
992{
993 int rc;
994 char *string;
995
996 string = match_strdup(args);
997 if (string == NULL)
998 return -ENOMEM;
999 rc = kstrtoul(string, 0, option);
1000 kfree(string);
1001
1002 return rc;
1003}
1004
1005static int get_option_uid(substring_t args[], kuid_t *result)
1006{
1007 unsigned long value;
1008 kuid_t uid;
1009 int rc;
1010
1011 rc = get_option_ul(args, &value);
1012 if (rc)
1013 return rc;
1014
1015 uid = make_kuid(current_user_ns(), value);
1016 if (!uid_valid(uid))
1017 return -EINVAL;
1018
1019 *result = uid;
1020 return 0;
1021}
1022
1023static int get_option_gid(substring_t args[], kgid_t *result)
1024{
1025 unsigned long value;
1026 kgid_t gid;
1027 int rc;
1028
1029 rc = get_option_ul(args, &value);
1030 if (rc)
1031 return rc;
1032
1033 gid = make_kgid(current_user_ns(), value);
1034 if (!gid_valid(gid))
1035 return -EINVAL;
1036
1037 *result = gid;
1038 return 0;
1039}
1040
1041static int cifs_parse_security_flavors(char *value,
1042 struct smb_vol *vol)
1043{
1044
1045 substring_t args[MAX_OPT_ARGS];
1046
1047 /*
1048 * With mount options, the last one should win. Reset any existing
1049 * settings back to default.
1050 */
1051 vol->sectype = Unspecified;
1052 vol->sign = false;
1053
1054 switch (match_token(value, cifs_secflavor_tokens, args)) {
1055 case Opt_sec_krb5p:
1056 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1057 return 1;
1058 case Opt_sec_krb5i:
1059 vol->sign = true;
1060 /* Fallthrough */
1061 case Opt_sec_krb5:
1062 vol->sectype = Kerberos;
1063 break;
1064 case Opt_sec_ntlmsspi:
1065 vol->sign = true;
1066 /* Fallthrough */
1067 case Opt_sec_ntlmssp:
1068 vol->sectype = RawNTLMSSP;
1069 break;
1070 case Opt_sec_ntlmi:
1071 vol->sign = true;
1072 /* Fallthrough */
1073 case Opt_ntlm:
1074 vol->sectype = NTLM;
1075 break;
1076 case Opt_sec_ntlmv2i:
1077 vol->sign = true;
1078 /* Fallthrough */
1079 case Opt_sec_ntlmv2:
1080 vol->sectype = NTLMv2;
1081 break;
1082#ifdef CONFIG_CIFS_WEAK_PW_HASH
1083 case Opt_sec_lanman:
1084 vol->sectype = LANMAN;
1085 break;
1086#endif
1087 case Opt_sec_none:
1088 vol->nullauth = 1;
1089 break;
1090 default:
1091 cifs_dbg(VFS, "bad security option: %s\n", value);
1092 return 1;
1093 }
1094
1095 return 0;
1096}
1097
1098static int
1099cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1100{
1101 substring_t args[MAX_OPT_ARGS];
1102
1103 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1104 case Opt_cache_loose:
1105 vol->direct_io = false;
1106 vol->strict_io = false;
1107 break;
1108 case Opt_cache_strict:
1109 vol->direct_io = false;
1110 vol->strict_io = true;
1111 break;
1112 case Opt_cache_none:
1113 vol->direct_io = true;
1114 vol->strict_io = false;
1115 break;
1116 default:
1117 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1118 return 1;
1119 }
1120 return 0;
1121}
1122
1123static int
1124cifs_parse_smb_version(char *value, struct smb_vol *vol)
1125{
1126 substring_t args[MAX_OPT_ARGS];
1127
1128 switch (match_token(value, cifs_smb_version_tokens, args)) {
1129 case Smb_1:
1130 vol->ops = &smb1_operations;
1131 vol->vals = &smb1_values;
1132 break;
1133#ifdef CONFIG_CIFS_SMB2
1134 case Smb_20:
1135 vol->ops = &smb20_operations;
1136 vol->vals = &smb20_values;
1137 break;
1138 case Smb_21:
1139 vol->ops = &smb21_operations;
1140 vol->vals = &smb21_values;
1141 break;
1142 case Smb_30:
1143 vol->ops = &smb30_operations;
1144 vol->vals = &smb30_values;
1145 break;
1146 case Smb_302:
1147 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1148 vol->vals = &smb302_values;
1149 break;
1150#ifdef CONFIG_CIFS_SMB311
1151 case Smb_311:
1152 vol->ops = &smb311_operations;
1153 vol->vals = &smb311_values;
1154 break;
1155#endif /* SMB311 */
1156#endif
1157 default:
1158 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1159 return 1;
1160 }
1161 return 0;
1162}
1163
1164/*
1165 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1166 * fields with the result. Returns 0 on success and an error otherwise.
1167 */
1168static int
1169cifs_parse_devname(const char *devname, struct smb_vol *vol)
1170{
1171 char *pos;
1172 const char *delims = "/\\";
1173 size_t len;
1174
1175 /* make sure we have a valid UNC double delimiter prefix */
1176 len = strspn(devname, delims);
1177 if (len != 2)
1178 return -EINVAL;
1179
1180 /* find delimiter between host and sharename */
1181 pos = strpbrk(devname + 2, delims);
1182 if (!pos)
1183 return -EINVAL;
1184
1185 /* skip past delimiter */
1186 ++pos;
1187
1188 /* now go until next delimiter or end of string */
1189 len = strcspn(pos, delims);
1190
1191 /* move "pos" up to delimiter or NULL */
1192 pos += len;
1193 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1194 if (!vol->UNC)
1195 return -ENOMEM;
1196
1197 convert_delimiter(vol->UNC, '\\');
1198
1199 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1200 if (!*pos++ || !*pos)
1201 return 0;
1202
1203 vol->prepath = kstrdup(pos, GFP_KERNEL);
1204 if (!vol->prepath)
1205 return -ENOMEM;
1206
1207 return 0;
1208}
1209
1210static int
1211cifs_parse_mount_options(const char *mountdata, const char *devname,
1212 struct smb_vol *vol)
1213{
1214 char *data, *end;
1215 char *mountdata_copy = NULL, *options;
1216 unsigned int temp_len, i, j;
1217 char separator[2];
1218 short int override_uid = -1;
1219 short int override_gid = -1;
1220 bool uid_specified = false;
1221 bool gid_specified = false;
1222 bool sloppy = false;
1223 char *invalid = NULL;
1224 char *nodename = utsname()->nodename;
1225 char *string = NULL;
1226 char *tmp_end, *value;
1227 char delim;
1228 bool got_ip = false;
1229 unsigned short port = 0;
1230 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1231
1232 separator[0] = ',';
1233 separator[1] = 0;
1234 delim = separator[0];
1235
1236 /* ensure we always start with zeroed-out smb_vol */
1237 memset(vol, 0, sizeof(*vol));
1238
1239 /*
1240 * does not have to be perfect mapping since field is
1241 * informational, only used for servers that do not support
1242 * port 445 and it can be overridden at mount time
1243 */
1244 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1245 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1246 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1247
1248 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1249 /* null target name indicates to use *SMBSERVR default called name
1250 if we end up sending RFC1001 session initialize */
1251 vol->target_rfc1001_name[0] = 0;
1252 vol->cred_uid = current_uid();
1253 vol->linux_uid = current_uid();
1254 vol->linux_gid = current_gid();
1255
1256 /*
1257 * default to SFM style remapping of seven reserved characters
1258 * unless user overrides it or we negotiate CIFS POSIX where
1259 * it is unnecessary. Can not simultaneously use more than one mapping
1260 * since then readdir could list files that open could not open
1261 */
1262 vol->remap = true;
1263
1264 /* default to only allowing write access to owner of the mount */
1265 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1266
1267 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1268 /* default is always to request posix paths. */
1269 vol->posix_paths = 1;
1270 /* default to using server inode numbers where available */
1271 vol->server_ino = 1;
1272
1273 /* default is to use strict cifs caching semantics */
1274 vol->strict_io = true;
1275
1276 vol->actimeo = CIFS_DEF_ACTIMEO;
1277
1278 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1279 vol->ops = &smb1_operations;
1280 vol->vals = &smb1_values;
1281
1282 if (!mountdata)
1283 goto cifs_parse_mount_err;
1284
1285 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1286 if (!mountdata_copy)
1287 goto cifs_parse_mount_err;
1288
1289 options = mountdata_copy;
1290 end = options + strlen(options);
1291
1292 if (strncmp(options, "sep=", 4) == 0) {
1293 if (options[4] != 0) {
1294 separator[0] = options[4];
1295 options += 5;
1296 } else {
1297 cifs_dbg(FYI, "Null separator not allowed\n");
1298 }
1299 }
1300 vol->backupuid_specified = false; /* no backup intent for a user */
1301 vol->backupgid_specified = false; /* no backup intent for a group */
1302
1303 switch (cifs_parse_devname(devname, vol)) {
1304 case 0:
1305 break;
1306 case -ENOMEM:
1307 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1308 goto cifs_parse_mount_err;
1309 case -EINVAL:
1310 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1311 goto cifs_parse_mount_err;
1312 default:
1313 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1314 goto cifs_parse_mount_err;
1315 }
1316
1317 while ((data = strsep(&options, separator)) != NULL) {
1318 substring_t args[MAX_OPT_ARGS];
1319 unsigned long option;
1320 int token;
1321
1322 if (!*data)
1323 continue;
1324
1325 token = match_token(data, cifs_mount_option_tokens, args);
1326
1327 switch (token) {
1328
1329 /* Ingnore the following */
1330 case Opt_ignore:
1331 break;
1332
1333 /* Boolean values */
1334 case Opt_user_xattr:
1335 vol->no_xattr = 0;
1336 break;
1337 case Opt_nouser_xattr:
1338 vol->no_xattr = 1;
1339 break;
1340 case Opt_forceuid:
1341 override_uid = 1;
1342 break;
1343 case Opt_noforceuid:
1344 override_uid = 0;
1345 break;
1346 case Opt_forcegid:
1347 override_gid = 1;
1348 break;
1349 case Opt_noforcegid:
1350 override_gid = 0;
1351 break;
1352 case Opt_noblocksend:
1353 vol->noblocksnd = 1;
1354 break;
1355 case Opt_noautotune:
1356 vol->noautotune = 1;
1357 break;
1358 case Opt_hard:
1359 vol->retry = 1;
1360 break;
1361 case Opt_soft:
1362 vol->retry = 0;
1363 break;
1364 case Opt_perm:
1365 vol->noperm = 0;
1366 break;
1367 case Opt_noperm:
1368 vol->noperm = 1;
1369 break;
1370 case Opt_mapchars:
1371 vol->sfu_remap = true;
1372 vol->remap = false; /* disable SFM mapping */
1373 break;
1374 case Opt_nomapchars:
1375 vol->sfu_remap = false;
1376 break;
1377 case Opt_mapposix:
1378 vol->remap = true;
1379 vol->sfu_remap = false; /* disable SFU mapping */
1380 break;
1381 case Opt_nomapposix:
1382 vol->remap = false;
1383 break;
1384 case Opt_sfu:
1385 vol->sfu_emul = 1;
1386 break;
1387 case Opt_nosfu:
1388 vol->sfu_emul = 0;
1389 break;
1390 case Opt_nodfs:
1391 vol->nodfs = 1;
1392 break;
1393 case Opt_posixpaths:
1394 vol->posix_paths = 1;
1395 break;
1396 case Opt_noposixpaths:
1397 vol->posix_paths = 0;
1398 break;
1399 case Opt_nounix:
1400 vol->no_linux_ext = 1;
1401 break;
1402 case Opt_nocase:
1403 vol->nocase = 1;
1404 break;
1405 case Opt_brl:
1406 vol->nobrl = 0;
1407 break;
1408 case Opt_nobrl:
1409 vol->nobrl = 1;
1410 /*
1411 * turn off mandatory locking in mode
1412 * if remote locking is turned off since the
1413 * local vfs will do advisory
1414 */
1415 if (vol->file_mode ==
1416 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1417 vol->file_mode = S_IALLUGO;
1418 break;
1419 case Opt_forcemandatorylock:
1420 vol->mand_lock = 1;
1421 break;
1422 case Opt_setuids:
1423 vol->setuids = 1;
1424 break;
1425 case Opt_nosetuids:
1426 vol->setuids = 0;
1427 break;
1428 case Opt_dynperm:
1429 vol->dynperm = true;
1430 break;
1431 case Opt_nodynperm:
1432 vol->dynperm = false;
1433 break;
1434 case Opt_nohard:
1435 vol->retry = 0;
1436 break;
1437 case Opt_nosoft:
1438 vol->retry = 1;
1439 break;
1440 case Opt_nointr:
1441 vol->intr = 0;
1442 break;
1443 case Opt_intr:
1444 vol->intr = 1;
1445 break;
1446 case Opt_nostrictsync:
1447 vol->nostrictsync = 1;
1448 break;
1449 case Opt_strictsync:
1450 vol->nostrictsync = 0;
1451 break;
1452 case Opt_serverino:
1453 vol->server_ino = 1;
1454 break;
1455 case Opt_noserverino:
1456 vol->server_ino = 0;
1457 break;
1458 case Opt_rwpidforward:
1459 vol->rwpidforward = 1;
1460 break;
1461 case Opt_cifsacl:
1462 vol->cifs_acl = 1;
1463 break;
1464 case Opt_nocifsacl:
1465 vol->cifs_acl = 0;
1466 break;
1467 case Opt_acl:
1468 vol->no_psx_acl = 0;
1469 break;
1470 case Opt_noacl:
1471 vol->no_psx_acl = 1;
1472 break;
1473 case Opt_locallease:
1474 vol->local_lease = 1;
1475 break;
1476 case Opt_sign:
1477 vol->sign = true;
1478 break;
1479 case Opt_seal:
1480 /* we do not do the following in secFlags because seal
1481 * is a per tree connection (mount) not a per socket
1482 * or per-smb connection option in the protocol
1483 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1484 */
1485 vol->seal = 1;
1486 break;
1487 case Opt_noac:
1488 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1489 break;
1490 case Opt_fsc:
1491#ifndef CONFIG_CIFS_FSCACHE
1492 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1493 goto cifs_parse_mount_err;
1494#endif
1495 vol->fsc = true;
1496 break;
1497 case Opt_mfsymlinks:
1498 vol->mfsymlinks = true;
1499 break;
1500 case Opt_multiuser:
1501 vol->multiuser = true;
1502 break;
1503 case Opt_sloppy:
1504 sloppy = true;
1505 break;
1506 case Opt_nosharesock:
1507 vol->nosharesock = true;
1508 break;
1509 case Opt_nopersistent:
1510 vol->nopersistent = true;
1511 if (vol->persistent) {
1512 cifs_dbg(VFS,
1513 "persistenthandles mount options conflict\n");
1514 goto cifs_parse_mount_err;
1515 }
1516 break;
1517 case Opt_persistent:
1518 vol->persistent = true;
1519 if ((vol->nopersistent) || (vol->resilient)) {
1520 cifs_dbg(VFS,
1521 "persistenthandles mount options conflict\n");
1522 goto cifs_parse_mount_err;
1523 }
1524 break;
1525 case Opt_resilient:
1526 vol->resilient = true;
1527 if (vol->persistent) {
1528 cifs_dbg(VFS,
1529 "persistenthandles mount options conflict\n");
1530 goto cifs_parse_mount_err;
1531 }
1532 break;
1533 case Opt_noresilient:
1534 vol->resilient = false; /* already the default */
1535 break;
1536
1537 /* Numeric Values */
1538 case Opt_backupuid:
1539 if (get_option_uid(args, &vol->backupuid)) {
1540 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1541 __func__);
1542 goto cifs_parse_mount_err;
1543 }
1544 vol->backupuid_specified = true;
1545 break;
1546 case Opt_backupgid:
1547 if (get_option_gid(args, &vol->backupgid)) {
1548 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1549 __func__);
1550 goto cifs_parse_mount_err;
1551 }
1552 vol->backupgid_specified = true;
1553 break;
1554 case Opt_uid:
1555 if (get_option_uid(args, &vol->linux_uid)) {
1556 cifs_dbg(VFS, "%s: Invalid uid value\n",
1557 __func__);
1558 goto cifs_parse_mount_err;
1559 }
1560 uid_specified = true;
1561 break;
1562 case Opt_cruid:
1563 if (get_option_uid(args, &vol->cred_uid)) {
1564 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1565 __func__);
1566 goto cifs_parse_mount_err;
1567 }
1568 break;
1569 case Opt_gid:
1570 if (get_option_gid(args, &vol->linux_gid)) {
1571 cifs_dbg(VFS, "%s: Invalid gid value\n",
1572 __func__);
1573 goto cifs_parse_mount_err;
1574 }
1575 gid_specified = true;
1576 break;
1577 case Opt_file_mode:
1578 if (get_option_ul(args, &option)) {
1579 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1580 __func__);
1581 goto cifs_parse_mount_err;
1582 }
1583 vol->file_mode = option;
1584 break;
1585 case Opt_dirmode:
1586 if (get_option_ul(args, &option)) {
1587 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1588 __func__);
1589 goto cifs_parse_mount_err;
1590 }
1591 vol->dir_mode = option;
1592 break;
1593 case Opt_port:
1594 if (get_option_ul(args, &option) ||
1595 option > USHRT_MAX) {
1596 cifs_dbg(VFS, "%s: Invalid port value\n",
1597 __func__);
1598 goto cifs_parse_mount_err;
1599 }
1600 port = (unsigned short)option;
1601 break;
1602 case Opt_rsize:
1603 if (get_option_ul(args, &option)) {
1604 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1605 __func__);
1606 goto cifs_parse_mount_err;
1607 }
1608 vol->rsize = option;
1609 break;
1610 case Opt_wsize:
1611 if (get_option_ul(args, &option)) {
1612 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1613 __func__);
1614 goto cifs_parse_mount_err;
1615 }
1616 vol->wsize = option;
1617 break;
1618 case Opt_actimeo:
1619 if (get_option_ul(args, &option)) {
1620 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1621 __func__);
1622 goto cifs_parse_mount_err;
1623 }
1624 vol->actimeo = HZ * option;
1625 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1626 cifs_dbg(VFS, "attribute cache timeout too large\n");
1627 goto cifs_parse_mount_err;
1628 }
1629 break;
1630 case Opt_echo_interval:
1631 if (get_option_ul(args, &option)) {
1632 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1633 __func__);
1634 goto cifs_parse_mount_err;
1635 }
1636 vol->echo_interval = option;
1637 break;
1638
1639 /* String Arguments */
1640
1641 case Opt_blank_user:
1642 /* null user, ie. anonymous authentication */
1643 vol->nullauth = 1;
1644 vol->username = NULL;
1645 break;
1646 case Opt_user:
1647 string = match_strdup(args);
1648 if (string == NULL)
1649 goto out_nomem;
1650
1651 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1652 CIFS_MAX_USERNAME_LEN) {
1653 pr_warn("CIFS: username too long\n");
1654 goto cifs_parse_mount_err;
1655 }
1656
1657 kfree(vol->username);
1658 vol->username = kstrdup(string, GFP_KERNEL);
1659 if (!vol->username)
1660 goto cifs_parse_mount_err;
1661 break;
1662 case Opt_blank_pass:
1663 /* passwords have to be handled differently
1664 * to allow the character used for deliminator
1665 * to be passed within them
1666 */
1667
1668 /*
1669 * Check if this is a case where the password
1670 * starts with a delimiter
1671 */
1672 tmp_end = strchr(data, '=');
1673 tmp_end++;
1674 if (!(tmp_end < end && tmp_end[1] == delim)) {
1675 /* No it is not. Set the password to NULL */
1676 kfree(vol->password);
1677 vol->password = NULL;
1678 break;
1679 }
1680 /* Yes it is. Drop down to Opt_pass below.*/
1681 case Opt_pass:
1682 /* Obtain the value string */
1683 value = strchr(data, '=');
1684 value++;
1685
1686 /* Set tmp_end to end of the string */
1687 tmp_end = (char *) value + strlen(value);
1688
1689 /* Check if following character is the deliminator
1690 * If yes, we have encountered a double deliminator
1691 * reset the NULL character to the deliminator
1692 */
1693 if (tmp_end < end && tmp_end[1] == delim) {
1694 tmp_end[0] = delim;
1695
1696 /* Keep iterating until we get to a single
1697 * deliminator OR the end
1698 */
1699 while ((tmp_end = strchr(tmp_end, delim))
1700 != NULL && (tmp_end[1] == delim)) {
1701 tmp_end = (char *) &tmp_end[2];
1702 }
1703
1704 /* Reset var options to point to next element */
1705 if (tmp_end) {
1706 tmp_end[0] = '\0';
1707 options = (char *) &tmp_end[1];
1708 } else
1709 /* Reached the end of the mount option
1710 * string */
1711 options = end;
1712 }
1713
1714 kfree(vol->password);
1715 /* Now build new password string */
1716 temp_len = strlen(value);
1717 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1718 if (vol->password == NULL) {
1719 pr_warn("CIFS: no memory for password\n");
1720 goto cifs_parse_mount_err;
1721 }
1722
1723 for (i = 0, j = 0; i < temp_len; i++, j++) {
1724 vol->password[j] = value[i];
1725 if ((value[i] == delim) &&
1726 value[i+1] == delim)
1727 /* skip the second deliminator */
1728 i++;
1729 }
1730 vol->password[j] = '\0';
1731 break;
1732 case Opt_blank_ip:
1733 /* FIXME: should this be an error instead? */
1734 got_ip = false;
1735 break;
1736 case Opt_ip:
1737 string = match_strdup(args);
1738 if (string == NULL)
1739 goto out_nomem;
1740
1741 if (!cifs_convert_address(dstaddr, string,
1742 strlen(string))) {
1743 pr_err("CIFS: bad ip= option (%s).\n", string);
1744 goto cifs_parse_mount_err;
1745 }
1746 got_ip = true;
1747 break;
1748 case Opt_domain:
1749 string = match_strdup(args);
1750 if (string == NULL)
1751 goto out_nomem;
1752
1753 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1754 == CIFS_MAX_DOMAINNAME_LEN) {
1755 pr_warn("CIFS: domain name too long\n");
1756 goto cifs_parse_mount_err;
1757 }
1758
1759 kfree(vol->domainname);
1760 vol->domainname = kstrdup(string, GFP_KERNEL);
1761 if (!vol->domainname) {
1762 pr_warn("CIFS: no memory for domainname\n");
1763 goto cifs_parse_mount_err;
1764 }
1765 cifs_dbg(FYI, "Domain name set\n");
1766 break;
1767 case Opt_srcaddr:
1768 string = match_strdup(args);
1769 if (string == NULL)
1770 goto out_nomem;
1771
1772 if (!cifs_convert_address(
1773 (struct sockaddr *)&vol->srcaddr,
1774 string, strlen(string))) {
1775 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1776 string);
1777 goto cifs_parse_mount_err;
1778 }
1779 break;
1780 case Opt_iocharset:
1781 string = match_strdup(args);
1782 if (string == NULL)
1783 goto out_nomem;
1784
1785 if (strnlen(string, 1024) >= 65) {
1786 pr_warn("CIFS: iocharset name too long.\n");
1787 goto cifs_parse_mount_err;
1788 }
1789
1790 if (strncasecmp(string, "default", 7) != 0) {
1791 kfree(vol->iocharset);
1792 vol->iocharset = kstrdup(string,
1793 GFP_KERNEL);
1794 if (!vol->iocharset) {
1795 pr_warn("CIFS: no memory for charset\n");
1796 goto cifs_parse_mount_err;
1797 }
1798 }
1799 /* if iocharset not set then load_nls_default
1800 * is used by caller
1801 */
1802 cifs_dbg(FYI, "iocharset set to %s\n", string);
1803 break;
1804 case Opt_netbiosname:
1805 string = match_strdup(args);
1806 if (string == NULL)
1807 goto out_nomem;
1808
1809 memset(vol->source_rfc1001_name, 0x20,
1810 RFC1001_NAME_LEN);
1811 /*
1812 * FIXME: are there cases in which a comma can
1813 * be valid in workstation netbios name (and
1814 * need special handling)?
1815 */
1816 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1817 /* don't ucase netbiosname for user */
1818 if (string[i] == 0)
1819 break;
1820 vol->source_rfc1001_name[i] = string[i];
1821 }
1822 /* The string has 16th byte zero still from
1823 * set at top of the function
1824 */
1825 if (i == RFC1001_NAME_LEN && string[i] != 0)
1826 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1827 break;
1828 case Opt_servern:
1829 /* servernetbiosname specified override *SMBSERVER */
1830 string = match_strdup(args);
1831 if (string == NULL)
1832 goto out_nomem;
1833
1834 /* last byte, type, is 0x20 for servr type */
1835 memset(vol->target_rfc1001_name, 0x20,
1836 RFC1001_NAME_LEN_WITH_NULL);
1837
1838 /* BB are there cases in which a comma can be
1839 valid in this workstation netbios name
1840 (and need special handling)? */
1841
1842 /* user or mount helper must uppercase the
1843 netbios name */
1844 for (i = 0; i < 15; i++) {
1845 if (string[i] == 0)
1846 break;
1847 vol->target_rfc1001_name[i] = string[i];
1848 }
1849 /* The string has 16th byte zero still from
1850 set at top of the function */
1851 if (i == RFC1001_NAME_LEN && string[i] != 0)
1852 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1853 break;
1854 case Opt_ver:
1855 string = match_strdup(args);
1856 if (string == NULL)
1857 goto out_nomem;
1858
1859 if (strncasecmp(string, "1", 1) == 0) {
1860 /* This is the default */
1861 break;
1862 }
1863 /* For all other value, error */
1864 pr_warn("CIFS: Invalid version specified\n");
1865 goto cifs_parse_mount_err;
1866 case Opt_vers:
1867 string = match_strdup(args);
1868 if (string == NULL)
1869 goto out_nomem;
1870
1871 if (cifs_parse_smb_version(string, vol) != 0)
1872 goto cifs_parse_mount_err;
1873 break;
1874 case Opt_sec:
1875 string = match_strdup(args);
1876 if (string == NULL)
1877 goto out_nomem;
1878
1879 if (cifs_parse_security_flavors(string, vol) != 0)
1880 goto cifs_parse_mount_err;
1881 break;
1882 case Opt_cache:
1883 string = match_strdup(args);
1884 if (string == NULL)
1885 goto out_nomem;
1886
1887 if (cifs_parse_cache_flavor(string, vol) != 0)
1888 goto cifs_parse_mount_err;
1889 break;
1890 default:
1891 /*
1892 * An option we don't recognize. Save it off for later
1893 * if we haven't already found one
1894 */
1895 if (!invalid)
1896 invalid = data;
1897 break;
1898 }
1899 /* Free up any allocated string */
1900 kfree(string);
1901 string = NULL;
1902 }
1903
1904 if (!sloppy && invalid) {
1905 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1906 goto cifs_parse_mount_err;
1907 }
1908
1909#ifndef CONFIG_KEYS
1910 /* Muliuser mounts require CONFIG_KEYS support */
1911 if (vol->multiuser) {
1912 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1913 goto cifs_parse_mount_err;
1914 }
1915#endif
1916 if (!vol->UNC) {
1917 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1918 goto cifs_parse_mount_err;
1919 }
1920
1921 /* make sure UNC has a share name */
1922 if (!strchr(vol->UNC + 3, '\\')) {
1923 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1924 goto cifs_parse_mount_err;
1925 }
1926
1927 if (!got_ip) {
1928 /* No ip= option specified? Try to get it from UNC */
1929 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1930 strlen(&vol->UNC[2]))) {
1931 pr_err("Unable to determine destination address.\n");
1932 goto cifs_parse_mount_err;
1933 }
1934 }
1935
1936 /* set the port that we got earlier */
1937 cifs_set_port(dstaddr, port);
1938
1939 if (uid_specified)
1940 vol->override_uid = override_uid;
1941 else if (override_uid == 1)
1942 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1943
1944 if (gid_specified)
1945 vol->override_gid = override_gid;
1946 else if (override_gid == 1)
1947 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1948
1949 kfree(mountdata_copy);
1950 return 0;
1951
1952out_nomem:
1953 pr_warn("Could not allocate temporary buffer\n");
1954cifs_parse_mount_err:
1955 kfree(string);
1956 kfree(mountdata_copy);
1957 return 1;
1958}
1959
1960/** Returns true if srcaddr isn't specified and rhs isn't
1961 * specified, or if srcaddr is specified and
1962 * matches the IP address of the rhs argument.
1963 */
1964static bool
1965srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1966{
1967 switch (srcaddr->sa_family) {
1968 case AF_UNSPEC:
1969 return (rhs->sa_family == AF_UNSPEC);
1970 case AF_INET: {
1971 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1972 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1973 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1974 }
1975 case AF_INET6: {
1976 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1977 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1978 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1979 }
1980 default:
1981 WARN_ON(1);
1982 return false; /* don't expect to be here */
1983 }
1984}
1985
1986/*
1987 * If no port is specified in addr structure, we try to match with 445 port
1988 * and if it fails - with 139 ports. It should be called only if address
1989 * families of server and addr are equal.
1990 */
1991static bool
1992match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1993{
1994 __be16 port, *sport;
1995
1996 switch (addr->sa_family) {
1997 case AF_INET:
1998 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1999 port = ((struct sockaddr_in *) addr)->sin_port;
2000 break;
2001 case AF_INET6:
2002 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2003 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2004 break;
2005 default:
2006 WARN_ON(1);
2007 return false;
2008 }
2009
2010 if (!port) {
2011 port = htons(CIFS_PORT);
2012 if (port == *sport)
2013 return true;
2014
2015 port = htons(RFC1001_PORT);
2016 }
2017
2018 return port == *sport;
2019}
2020
2021static bool
2022match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2023 struct sockaddr *srcaddr)
2024{
2025 switch (addr->sa_family) {
2026 case AF_INET: {
2027 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2028 struct sockaddr_in *srv_addr4 =
2029 (struct sockaddr_in *)&server->dstaddr;
2030
2031 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2032 return false;
2033 break;
2034 }
2035 case AF_INET6: {
2036 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2037 struct sockaddr_in6 *srv_addr6 =
2038 (struct sockaddr_in6 *)&server->dstaddr;
2039
2040 if (!ipv6_addr_equal(&addr6->sin6_addr,
2041 &srv_addr6->sin6_addr))
2042 return false;
2043 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2044 return false;
2045 break;
2046 }
2047 default:
2048 WARN_ON(1);
2049 return false; /* don't expect to be here */
2050 }
2051
2052 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2053 return false;
2054
2055 return true;
2056}
2057
2058static bool
2059match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2060{
2061 /*
2062 * The select_sectype function should either return the vol->sectype
2063 * that was specified, or "Unspecified" if that sectype was not
2064 * compatible with the given NEGOTIATE request.
2065 */
2066 if (select_sectype(server, vol->sectype) == Unspecified)
2067 return false;
2068
2069 /*
2070 * Now check if signing mode is acceptable. No need to check
2071 * global_secflags at this point since if MUST_SIGN is set then
2072 * the server->sign had better be too.
2073 */
2074 if (vol->sign && !server->sign)
2075 return false;
2076
2077 return true;
2078}
2079
2080static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2081{
2082 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2083
2084 if (vol->nosharesock)
2085 return 0;
2086
2087 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2088 return 0;
2089
2090 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2091 return 0;
2092
2093 if (!match_address(server, addr,
2094 (struct sockaddr *)&vol->srcaddr))
2095 return 0;
2096
2097 if (!match_port(server, addr))
2098 return 0;
2099
2100 if (!match_security(server, vol))
2101 return 0;
2102
2103 if (server->echo_interval != vol->echo_interval)
2104 return 0;
2105
2106 return 1;
2107}
2108
2109static struct TCP_Server_Info *
2110cifs_find_tcp_session(struct smb_vol *vol)
2111{
2112 struct TCP_Server_Info *server;
2113
2114 spin_lock(&cifs_tcp_ses_lock);
2115 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2116 if (!match_server(server, vol))
2117 continue;
2118
2119 ++server->srv_count;
2120 spin_unlock(&cifs_tcp_ses_lock);
2121 cifs_dbg(FYI, "Existing tcp session with server found\n");
2122 return server;
2123 }
2124 spin_unlock(&cifs_tcp_ses_lock);
2125 return NULL;
2126}
2127
2128static void
2129cifs_put_tcp_session(struct TCP_Server_Info *server)
2130{
2131 struct task_struct *task;
2132
2133 spin_lock(&cifs_tcp_ses_lock);
2134 if (--server->srv_count > 0) {
2135 spin_unlock(&cifs_tcp_ses_lock);
2136 return;
2137 }
2138
2139 put_net(cifs_net_ns(server));
2140
2141 list_del_init(&server->tcp_ses_list);
2142 spin_unlock(&cifs_tcp_ses_lock);
2143
2144 cancel_delayed_work_sync(&server->echo);
2145
2146 spin_lock(&GlobalMid_Lock);
2147 server->tcpStatus = CifsExiting;
2148 spin_unlock(&GlobalMid_Lock);
2149
2150 cifs_crypto_shash_release(server);
2151 cifs_fscache_release_client_cookie(server);
2152
2153 kfree(server->session_key.response);
2154 server->session_key.response = NULL;
2155 server->session_key.len = 0;
2156
2157 task = xchg(&server->tsk, NULL);
2158 if (task)
2159 force_sig(SIGKILL, task);
2160}
2161
2162static struct TCP_Server_Info *
2163cifs_get_tcp_session(struct smb_vol *volume_info)
2164{
2165 struct TCP_Server_Info *tcp_ses = NULL;
2166 int rc;
2167
2168 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2169
2170 /* see if we already have a matching tcp_ses */
2171 tcp_ses = cifs_find_tcp_session(volume_info);
2172 if (tcp_ses)
2173 return tcp_ses;
2174
2175 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2176 if (!tcp_ses) {
2177 rc = -ENOMEM;
2178 goto out_err;
2179 }
2180
2181 tcp_ses->ops = volume_info->ops;
2182 tcp_ses->vals = volume_info->vals;
2183 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2184 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2185 if (IS_ERR(tcp_ses->hostname)) {
2186 rc = PTR_ERR(tcp_ses->hostname);
2187 goto out_err_crypto_release;
2188 }
2189
2190 tcp_ses->noblocksnd = volume_info->noblocksnd;
2191 tcp_ses->noautotune = volume_info->noautotune;
2192 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2193 tcp_ses->in_flight = 0;
2194 tcp_ses->credits = 1;
2195 init_waitqueue_head(&tcp_ses->response_q);
2196 init_waitqueue_head(&tcp_ses->request_q);
2197 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2198 mutex_init(&tcp_ses->srv_mutex);
2199 memcpy(tcp_ses->workstation_RFC1001_name,
2200 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2201 memcpy(tcp_ses->server_RFC1001_name,
2202 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2203 tcp_ses->session_estab = false;
2204 tcp_ses->sequence_number = 0;
2205 tcp_ses->lstrp = jiffies;
2206 spin_lock_init(&tcp_ses->req_lock);
2207 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2208 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2209 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2210 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2211 sizeof(tcp_ses->srcaddr));
2212 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2213 sizeof(tcp_ses->dstaddr));
2214#ifdef CONFIG_CIFS_SMB2
2215 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2216#endif
2217 /*
2218 * at this point we are the only ones with the pointer
2219 * to the struct since the kernel thread not created yet
2220 * no need to spinlock this init of tcpStatus or srv_count
2221 */
2222 tcp_ses->tcpStatus = CifsNew;
2223 ++tcp_ses->srv_count;
2224
2225 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2226 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2227 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2228 else
2229 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2230
2231 rc = ip_connect(tcp_ses);
2232 if (rc < 0) {
2233 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2234 goto out_err_crypto_release;
2235 }
2236
2237 /*
2238 * since we're in a cifs function already, we know that
2239 * this will succeed. No need for try_module_get().
2240 */
2241 __module_get(THIS_MODULE);
2242 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2243 tcp_ses, "cifsd");
2244 if (IS_ERR(tcp_ses->tsk)) {
2245 rc = PTR_ERR(tcp_ses->tsk);
2246 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2247 module_put(THIS_MODULE);
2248 goto out_err_crypto_release;
2249 }
2250 tcp_ses->tcpStatus = CifsNeedNegotiate;
2251
2252 /* thread spawned, put it on the list */
2253 spin_lock(&cifs_tcp_ses_lock);
2254 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2255 spin_unlock(&cifs_tcp_ses_lock);
2256
2257 cifs_fscache_get_client_cookie(tcp_ses);
2258
2259 /* queue echo request delayed work */
2260 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2261
2262 return tcp_ses;
2263
2264out_err_crypto_release:
2265 cifs_crypto_shash_release(tcp_ses);
2266
2267 put_net(cifs_net_ns(tcp_ses));
2268
2269out_err:
2270 if (tcp_ses) {
2271 if (!IS_ERR(tcp_ses->hostname))
2272 kfree(tcp_ses->hostname);
2273 if (tcp_ses->ssocket)
2274 sock_release(tcp_ses->ssocket);
2275 kfree(tcp_ses);
2276 }
2277 return ERR_PTR(rc);
2278}
2279
2280static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2281{
2282 if (vol->sectype != Unspecified &&
2283 vol->sectype != ses->sectype)
2284 return 0;
2285
2286 switch (ses->sectype) {
2287 case Kerberos:
2288 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2289 return 0;
2290 break;
2291 default:
2292 /* NULL username means anonymous session */
2293 if (ses->user_name == NULL) {
2294 if (!vol->nullauth)
2295 return 0;
2296 break;
2297 }
2298
2299 /* anything else takes username/password */
2300 if (strncmp(ses->user_name,
2301 vol->username ? vol->username : "",
2302 CIFS_MAX_USERNAME_LEN))
2303 return 0;
2304 if ((vol->username && strlen(vol->username) != 0) &&
2305 ses->password != NULL &&
2306 strncmp(ses->password,
2307 vol->password ? vol->password : "",
2308 CIFS_MAX_PASSWORD_LEN))
2309 return 0;
2310 }
2311 return 1;
2312}
2313
2314static struct cifs_ses *
2315cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2316{
2317 struct cifs_ses *ses;
2318
2319 spin_lock(&cifs_tcp_ses_lock);
2320 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2321 if (ses->status == CifsExiting)
2322 continue;
2323 if (!match_session(ses, vol))
2324 continue;
2325 ++ses->ses_count;
2326 spin_unlock(&cifs_tcp_ses_lock);
2327 return ses;
2328 }
2329 spin_unlock(&cifs_tcp_ses_lock);
2330 return NULL;
2331}
2332
2333static void
2334cifs_put_smb_ses(struct cifs_ses *ses)
2335{
2336 unsigned int rc, xid;
2337 struct TCP_Server_Info *server = ses->server;
2338
2339 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2340
2341 spin_lock(&cifs_tcp_ses_lock);
2342 if (ses->status == CifsExiting) {
2343 spin_unlock(&cifs_tcp_ses_lock);
2344 return;
2345 }
2346 if (--ses->ses_count > 0) {
2347 spin_unlock(&cifs_tcp_ses_lock);
2348 return;
2349 }
2350 if (ses->status == CifsGood)
2351 ses->status = CifsExiting;
2352 spin_unlock(&cifs_tcp_ses_lock);
2353
2354 if (ses->status == CifsExiting && server->ops->logoff) {
2355 xid = get_xid();
2356 rc = server->ops->logoff(xid, ses);
2357 if (rc)
2358 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2359 __func__, rc);
2360 _free_xid(xid);
2361 }
2362
2363 spin_lock(&cifs_tcp_ses_lock);
2364 list_del_init(&ses->smb_ses_list);
2365 spin_unlock(&cifs_tcp_ses_lock);
2366
2367 sesInfoFree(ses);
2368 cifs_put_tcp_session(server);
2369}
2370
2371#ifdef CONFIG_KEYS
2372
2373/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2374#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2375
2376/* Populate username and pw fields from keyring if possible */
2377static int
2378cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2379{
2380 int rc = 0;
2381 const char *delim, *payload;
2382 char *desc;
2383 ssize_t len;
2384 struct key *key;
2385 struct TCP_Server_Info *server = ses->server;
2386 struct sockaddr_in *sa;
2387 struct sockaddr_in6 *sa6;
2388 const struct user_key_payload *upayload;
2389
2390 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2391 if (!desc)
2392 return -ENOMEM;
2393
2394 /* try to find an address key first */
2395 switch (server->dstaddr.ss_family) {
2396 case AF_INET:
2397 sa = (struct sockaddr_in *)&server->dstaddr;
2398 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2399 break;
2400 case AF_INET6:
2401 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2402 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2403 break;
2404 default:
2405 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2406 server->dstaddr.ss_family);
2407 rc = -EINVAL;
2408 goto out_err;
2409 }
2410
2411 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2412 key = request_key(&key_type_logon, desc, "");
2413 if (IS_ERR(key)) {
2414 if (!ses->domainName) {
2415 cifs_dbg(FYI, "domainName is NULL\n");
2416 rc = PTR_ERR(key);
2417 goto out_err;
2418 }
2419
2420 /* didn't work, try to find a domain key */
2421 sprintf(desc, "cifs:d:%s", ses->domainName);
2422 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2423 key = request_key(&key_type_logon, desc, "");
2424 if (IS_ERR(key)) {
2425 rc = PTR_ERR(key);
2426 goto out_err;
2427 }
2428 }
2429
2430 down_read(&key->sem);
2431 upayload = user_key_payload(key);
2432 if (IS_ERR_OR_NULL(upayload)) {
2433 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2434 goto out_key_put;
2435 }
2436
2437 /* find first : in payload */
2438 payload = upayload->data;
2439 delim = strnchr(payload, upayload->datalen, ':');
2440 cifs_dbg(FYI, "payload=%s\n", payload);
2441 if (!delim) {
2442 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2443 upayload->datalen);
2444 rc = -EINVAL;
2445 goto out_key_put;
2446 }
2447
2448 len = delim - payload;
2449 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2450 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2451 len);
2452 rc = -EINVAL;
2453 goto out_key_put;
2454 }
2455
2456 vol->username = kstrndup(payload, len, GFP_KERNEL);
2457 if (!vol->username) {
2458 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2459 len);
2460 rc = -ENOMEM;
2461 goto out_key_put;
2462 }
2463 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2464
2465 len = key->datalen - (len + 1);
2466 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2467 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2468 rc = -EINVAL;
2469 kfree(vol->username);
2470 vol->username = NULL;
2471 goto out_key_put;
2472 }
2473
2474 ++delim;
2475 vol->password = kstrndup(delim, len, GFP_KERNEL);
2476 if (!vol->password) {
2477 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2478 len);
2479 rc = -ENOMEM;
2480 kfree(vol->username);
2481 vol->username = NULL;
2482 goto out_key_put;
2483 }
2484
2485out_key_put:
2486 up_read(&key->sem);
2487 key_put(key);
2488out_err:
2489 kfree(desc);
2490 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2491 return rc;
2492}
2493#else /* ! CONFIG_KEYS */
2494static inline int
2495cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2496 struct cifs_ses *ses __attribute__((unused)))
2497{
2498 return -ENOSYS;
2499}
2500#endif /* CONFIG_KEYS */
2501
2502static struct cifs_ses *
2503cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2504{
2505 int rc = -ENOMEM;
2506 unsigned int xid;
2507 struct cifs_ses *ses;
2508 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2509 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2510
2511 xid = get_xid();
2512
2513 ses = cifs_find_smb_ses(server, volume_info);
2514 if (ses) {
2515 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2516 ses->status);
2517
2518 mutex_lock(&ses->session_mutex);
2519 rc = cifs_negotiate_protocol(xid, ses);
2520 if (rc) {
2521 mutex_unlock(&ses->session_mutex);
2522 /* problem -- put our ses reference */
2523 cifs_put_smb_ses(ses);
2524 free_xid(xid);
2525 return ERR_PTR(rc);
2526 }
2527 if (ses->need_reconnect) {
2528 cifs_dbg(FYI, "Session needs reconnect\n");
2529 rc = cifs_setup_session(xid, ses,
2530 volume_info->local_nls);
2531 if (rc) {
2532 mutex_unlock(&ses->session_mutex);
2533 /* problem -- put our reference */
2534 cifs_put_smb_ses(ses);
2535 free_xid(xid);
2536 return ERR_PTR(rc);
2537 }
2538 }
2539 mutex_unlock(&ses->session_mutex);
2540
2541 /* existing SMB ses has a server reference already */
2542 cifs_put_tcp_session(server);
2543 free_xid(xid);
2544 return ses;
2545 }
2546
2547 cifs_dbg(FYI, "Existing smb sess not found\n");
2548 ses = sesInfoAlloc();
2549 if (ses == NULL)
2550 goto get_ses_fail;
2551
2552 /* new SMB session uses our server ref */
2553 ses->server = server;
2554 if (server->dstaddr.ss_family == AF_INET6)
2555 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2556 else
2557 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2558
2559 if (volume_info->username) {
2560 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2561 if (!ses->user_name)
2562 goto get_ses_fail;
2563 }
2564
2565 /* volume_info->password freed at unmount */
2566 if (volume_info->password) {
2567 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2568 if (!ses->password)
2569 goto get_ses_fail;
2570 }
2571 if (volume_info->domainname) {
2572 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2573 if (!ses->domainName)
2574 goto get_ses_fail;
2575 }
2576 ses->cred_uid = volume_info->cred_uid;
2577 ses->linux_uid = volume_info->linux_uid;
2578
2579 ses->sectype = volume_info->sectype;
2580 ses->sign = volume_info->sign;
2581
2582 mutex_lock(&ses->session_mutex);
2583 rc = cifs_negotiate_protocol(xid, ses);
2584 if (!rc)
2585 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2586 mutex_unlock(&ses->session_mutex);
2587 if (rc)
2588 goto get_ses_fail;
2589
2590 /* success, put it on the list */
2591 spin_lock(&cifs_tcp_ses_lock);
2592 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2593 spin_unlock(&cifs_tcp_ses_lock);
2594
2595 free_xid(xid);
2596 return ses;
2597
2598get_ses_fail:
2599 sesInfoFree(ses);
2600 free_xid(xid);
2601 return ERR_PTR(rc);
2602}
2603
2604static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2605{
2606 if (tcon->tidStatus == CifsExiting)
2607 return 0;
2608 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2609 return 0;
2610 return 1;
2611}
2612
2613static struct cifs_tcon *
2614cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2615{
2616 struct list_head *tmp;
2617 struct cifs_tcon *tcon;
2618
2619 spin_lock(&cifs_tcp_ses_lock);
2620 list_for_each(tmp, &ses->tcon_list) {
2621 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2622 if (!match_tcon(tcon, unc))
2623 continue;
2624 ++tcon->tc_count;
2625 spin_unlock(&cifs_tcp_ses_lock);
2626 return tcon;
2627 }
2628 spin_unlock(&cifs_tcp_ses_lock);
2629 return NULL;
2630}
2631
2632static void
2633cifs_put_tcon(struct cifs_tcon *tcon)
2634{
2635 unsigned int xid;
2636 struct cifs_ses *ses = tcon->ses;
2637
2638 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2639 spin_lock(&cifs_tcp_ses_lock);
2640 if (--tcon->tc_count > 0) {
2641 spin_unlock(&cifs_tcp_ses_lock);
2642 return;
2643 }
2644
2645 list_del_init(&tcon->tcon_list);
2646 spin_unlock(&cifs_tcp_ses_lock);
2647
2648 xid = get_xid();
2649 if (ses->server->ops->tree_disconnect)
2650 ses->server->ops->tree_disconnect(xid, tcon);
2651 _free_xid(xid);
2652
2653 cifs_fscache_release_super_cookie(tcon);
2654 tconInfoFree(tcon);
2655 cifs_put_smb_ses(ses);
2656}
2657
2658static struct cifs_tcon *
2659cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2660{
2661 int rc, xid;
2662 struct cifs_tcon *tcon;
2663
2664 tcon = cifs_find_tcon(ses, volume_info->UNC);
2665 if (tcon) {
2666 cifs_dbg(FYI, "Found match on UNC path\n");
2667 /* existing tcon already has a reference */
2668 cifs_put_smb_ses(ses);
2669 if (tcon->seal != volume_info->seal)
2670 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2671 return tcon;
2672 }
2673
2674 if (!ses->server->ops->tree_connect) {
2675 rc = -ENOSYS;
2676 goto out_fail;
2677 }
2678
2679 tcon = tconInfoAlloc();
2680 if (tcon == NULL) {
2681 rc = -ENOMEM;
2682 goto out_fail;
2683 }
2684
2685 tcon->ses = ses;
2686 if (volume_info->password) {
2687 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2688 if (!tcon->password) {
2689 rc = -ENOMEM;
2690 goto out_fail;
2691 }
2692 }
2693
2694 /*
2695 * BB Do we need to wrap session_mutex around this TCon call and Unix
2696 * SetFS as we do on SessSetup and reconnect?
2697 */
2698 xid = get_xid();
2699 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2700 volume_info->local_nls);
2701 free_xid(xid);
2702 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2703 if (rc)
2704 goto out_fail;
2705
2706 if (volume_info->nodfs) {
2707 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2708 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2709 }
2710 tcon->seal = volume_info->seal;
2711 tcon->use_persistent = false;
2712 /* check if SMB2 or later, CIFS does not support persistent handles */
2713 if (volume_info->persistent) {
2714 if (ses->server->vals->protocol_id == 0) {
2715 cifs_dbg(VFS,
2716 "SMB3 or later required for persistent handles\n");
2717 rc = -EOPNOTSUPP;
2718 goto out_fail;
2719#ifdef CONFIG_CIFS_SMB2
2720 } else if (ses->server->capabilities &
2721 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2722 tcon->use_persistent = true;
2723 else /* persistent handles requested but not supported */ {
2724 cifs_dbg(VFS,
2725 "Persistent handles not supported on share\n");
2726 rc = -EOPNOTSUPP;
2727 goto out_fail;
2728#endif /* CONFIG_CIFS_SMB2 */
2729 }
2730#ifdef CONFIG_CIFS_SMB2
2731 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2732 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2733 && (volume_info->nopersistent == false)) {
2734 cifs_dbg(FYI, "enabling persistent handles\n");
2735 tcon->use_persistent = true;
2736#endif /* CONFIG_CIFS_SMB2 */
2737 } else if (volume_info->resilient) {
2738 if (ses->server->vals->protocol_id == 0) {
2739 cifs_dbg(VFS,
2740 "SMB2.1 or later required for resilient handles\n");
2741 rc = -EOPNOTSUPP;
2742 goto out_fail;
2743 }
2744 tcon->use_resilient = true;
2745 }
2746
2747 /*
2748 * We can have only one retry value for a connection to a share so for
2749 * resources mounted more than once to the same server share the last
2750 * value passed in for the retry flag is used.
2751 */
2752 tcon->retry = volume_info->retry;
2753 tcon->nocase = volume_info->nocase;
2754 tcon->local_lease = volume_info->local_lease;
2755 INIT_LIST_HEAD(&tcon->pending_opens);
2756
2757 spin_lock(&cifs_tcp_ses_lock);
2758 list_add(&tcon->tcon_list, &ses->tcon_list);
2759 spin_unlock(&cifs_tcp_ses_lock);
2760
2761 cifs_fscache_get_super_cookie(tcon);
2762
2763 return tcon;
2764
2765out_fail:
2766 tconInfoFree(tcon);
2767 return ERR_PTR(rc);
2768}
2769
2770void
2771cifs_put_tlink(struct tcon_link *tlink)
2772{
2773 if (!tlink || IS_ERR(tlink))
2774 return;
2775
2776 if (!atomic_dec_and_test(&tlink->tl_count) ||
2777 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2778 tlink->tl_time = jiffies;
2779 return;
2780 }
2781
2782 if (!IS_ERR(tlink_tcon(tlink)))
2783 cifs_put_tcon(tlink_tcon(tlink));
2784 kfree(tlink);
2785 return;
2786}
2787
2788static inline struct tcon_link *
2789cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2790{
2791 return cifs_sb->master_tlink;
2792}
2793
2794static int
2795compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2796{
2797 struct cifs_sb_info *old = CIFS_SB(sb);
2798 struct cifs_sb_info *new = mnt_data->cifs_sb;
2799
2800 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2801 return 0;
2802
2803 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2804 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2805 return 0;
2806
2807 /*
2808 * We want to share sb only if we don't specify an r/wsize or
2809 * specified r/wsize is greater than or equal to existing one.
2810 */
2811 if (new->wsize && new->wsize < old->wsize)
2812 return 0;
2813
2814 if (new->rsize && new->rsize < old->rsize)
2815 return 0;
2816
2817 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2818 return 0;
2819
2820 if (old->mnt_file_mode != new->mnt_file_mode ||
2821 old->mnt_dir_mode != new->mnt_dir_mode)
2822 return 0;
2823
2824 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2825 return 0;
2826
2827 if (old->actimeo != new->actimeo)
2828 return 0;
2829
2830 return 1;
2831}
2832
2833int
2834cifs_match_super(struct super_block *sb, void *data)
2835{
2836 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2837 struct smb_vol *volume_info;
2838 struct cifs_sb_info *cifs_sb;
2839 struct TCP_Server_Info *tcp_srv;
2840 struct cifs_ses *ses;
2841 struct cifs_tcon *tcon;
2842 struct tcon_link *tlink;
2843 int rc = 0;
2844
2845 spin_lock(&cifs_tcp_ses_lock);
2846 cifs_sb = CIFS_SB(sb);
2847 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2848 if (IS_ERR(tlink)) {
2849 spin_unlock(&cifs_tcp_ses_lock);
2850 return rc;
2851 }
2852 tcon = tlink_tcon(tlink);
2853 ses = tcon->ses;
2854 tcp_srv = ses->server;
2855
2856 volume_info = mnt_data->vol;
2857
2858 if (!match_server(tcp_srv, volume_info) ||
2859 !match_session(ses, volume_info) ||
2860 !match_tcon(tcon, volume_info->UNC)) {
2861 rc = 0;
2862 goto out;
2863 }
2864
2865 rc = compare_mount_options(sb, mnt_data);
2866out:
2867 spin_unlock(&cifs_tcp_ses_lock);
2868 cifs_put_tlink(tlink);
2869 return rc;
2870}
2871
2872int
2873get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2874 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2875 struct dfs_info3_param **referrals, int remap)
2876{
2877 char *temp_unc;
2878 int rc = 0;
2879
2880 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2881 return -ENOSYS;
2882
2883 *num_referrals = 0;
2884 *referrals = NULL;
2885
2886 if (ses->ipc_tid == 0) {
2887 temp_unc = kmalloc(2 /* for slashes */ +
2888 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2889 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2890 if (temp_unc == NULL)
2891 return -ENOMEM;
2892 temp_unc[0] = '\\';
2893 temp_unc[1] = '\\';
2894 strcpy(temp_unc + 2, ses->serverName);
2895 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2896 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2897 nls_codepage);
2898 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2899 kfree(temp_unc);
2900 }
2901 if (rc == 0)
2902 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2903 referrals, num_referrals,
2904 nls_codepage, remap);
2905 /*
2906 * BB - map targetUNCs to dfs_info3 structures, here or in
2907 * ses->server->ops->get_dfs_refer.
2908 */
2909
2910 return rc;
2911}
2912
2913#ifdef CONFIG_DEBUG_LOCK_ALLOC
2914static struct lock_class_key cifs_key[2];
2915static struct lock_class_key cifs_slock_key[2];
2916
2917static inline void
2918cifs_reclassify_socket4(struct socket *sock)
2919{
2920 struct sock *sk = sock->sk;
2921 BUG_ON(sock_owned_by_user(sk));
2922 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2923 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2924}
2925
2926static inline void
2927cifs_reclassify_socket6(struct socket *sock)
2928{
2929 struct sock *sk = sock->sk;
2930 BUG_ON(sock_owned_by_user(sk));
2931 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2932 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2933}
2934#else
2935static inline void
2936cifs_reclassify_socket4(struct socket *sock)
2937{
2938}
2939
2940static inline void
2941cifs_reclassify_socket6(struct socket *sock)
2942{
2943}
2944#endif
2945
2946/* See RFC1001 section 14 on representation of Netbios names */
2947static void rfc1002mangle(char *target, char *source, unsigned int length)
2948{
2949 unsigned int i, j;
2950
2951 for (i = 0, j = 0; i < (length); i++) {
2952 /* mask a nibble at a time and encode */
2953 target[j] = 'A' + (0x0F & (source[i] >> 4));
2954 target[j+1] = 'A' + (0x0F & source[i]);
2955 j += 2;
2956 }
2957
2958}
2959
2960static int
2961bind_socket(struct TCP_Server_Info *server)
2962{
2963 int rc = 0;
2964 if (server->srcaddr.ss_family != AF_UNSPEC) {
2965 /* Bind to the specified local IP address */
2966 struct socket *socket = server->ssocket;
2967 rc = socket->ops->bind(socket,
2968 (struct sockaddr *) &server->srcaddr,
2969 sizeof(server->srcaddr));
2970 if (rc < 0) {
2971 struct sockaddr_in *saddr4;
2972 struct sockaddr_in6 *saddr6;
2973 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2974 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2975 if (saddr6->sin6_family == AF_INET6)
2976 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2977 &saddr6->sin6_addr, rc);
2978 else
2979 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2980 &saddr4->sin_addr.s_addr, rc);
2981 }
2982 }
2983 return rc;
2984}
2985
2986static int
2987ip_rfc1001_connect(struct TCP_Server_Info *server)
2988{
2989 int rc = 0;
2990 /*
2991 * some servers require RFC1001 sessinit before sending
2992 * negprot - BB check reconnection in case where second
2993 * sessinit is sent but no second negprot
2994 */
2995 struct rfc1002_session_packet *ses_init_buf;
2996 struct smb_hdr *smb_buf;
2997 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2998 GFP_KERNEL);
2999 if (ses_init_buf) {
3000 ses_init_buf->trailer.session_req.called_len = 32;
3001
3002 if (server->server_RFC1001_name[0] != 0)
3003 rfc1002mangle(ses_init_buf->trailer.
3004 session_req.called_name,
3005 server->server_RFC1001_name,
3006 RFC1001_NAME_LEN_WITH_NULL);
3007 else
3008 rfc1002mangle(ses_init_buf->trailer.
3009 session_req.called_name,
3010 DEFAULT_CIFS_CALLED_NAME,
3011 RFC1001_NAME_LEN_WITH_NULL);
3012
3013 ses_init_buf->trailer.session_req.calling_len = 32;
3014
3015 /*
3016 * calling name ends in null (byte 16) from old smb
3017 * convention.
3018 */
3019 if (server->workstation_RFC1001_name[0] != 0)
3020 rfc1002mangle(ses_init_buf->trailer.
3021 session_req.calling_name,
3022 server->workstation_RFC1001_name,
3023 RFC1001_NAME_LEN_WITH_NULL);
3024 else
3025 rfc1002mangle(ses_init_buf->trailer.
3026 session_req.calling_name,
3027 "LINUX_CIFS_CLNT",
3028 RFC1001_NAME_LEN_WITH_NULL);
3029
3030 ses_init_buf->trailer.session_req.scope1 = 0;
3031 ses_init_buf->trailer.session_req.scope2 = 0;
3032 smb_buf = (struct smb_hdr *)ses_init_buf;
3033
3034 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3035 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3036 rc = smb_send(server, smb_buf, 0x44);
3037 kfree(ses_init_buf);
3038 /*
3039 * RFC1001 layer in at least one server
3040 * requires very short break before negprot
3041 * presumably because not expecting negprot
3042 * to follow so fast. This is a simple
3043 * solution that works without
3044 * complicating the code and causes no
3045 * significant slowing down on mount
3046 * for everyone else
3047 */
3048 usleep_range(1000, 2000);
3049 }
3050 /*
3051 * else the negprot may still work without this
3052 * even though malloc failed
3053 */
3054
3055 return rc;
3056}
3057
3058static int
3059generic_ip_connect(struct TCP_Server_Info *server)
3060{
3061 int rc = 0;
3062 __be16 sport;
3063 int slen, sfamily;
3064 struct socket *socket = server->ssocket;
3065 struct sockaddr *saddr;
3066
3067 saddr = (struct sockaddr *) &server->dstaddr;
3068
3069 if (server->dstaddr.ss_family == AF_INET6) {
3070 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3071 slen = sizeof(struct sockaddr_in6);
3072 sfamily = AF_INET6;
3073 } else {
3074 sport = ((struct sockaddr_in *) saddr)->sin_port;
3075 slen = sizeof(struct sockaddr_in);
3076 sfamily = AF_INET;
3077 }
3078
3079 if (socket == NULL) {
3080 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3081 IPPROTO_TCP, &socket, 1);
3082 if (rc < 0) {
3083 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3084 server->ssocket = NULL;
3085 return rc;
3086 }
3087
3088 /* BB other socket options to set KEEPALIVE, NODELAY? */
3089 cifs_dbg(FYI, "Socket created\n");
3090 server->ssocket = socket;
3091 socket->sk->sk_allocation = GFP_NOFS;
3092 if (sfamily == AF_INET6)
3093 cifs_reclassify_socket6(socket);
3094 else
3095 cifs_reclassify_socket4(socket);
3096 }
3097
3098 rc = bind_socket(server);
3099 if (rc < 0)
3100 return rc;
3101
3102 /*
3103 * Eventually check for other socket options to change from
3104 * the default. sock_setsockopt not used because it expects
3105 * user space buffer
3106 */
3107 socket->sk->sk_rcvtimeo = 7 * HZ;
3108 socket->sk->sk_sndtimeo = 5 * HZ;
3109
3110 /* make the bufsizes depend on wsize/rsize and max requests */
3111 if (server->noautotune) {
3112 if (socket->sk->sk_sndbuf < (200 * 1024))
3113 socket->sk->sk_sndbuf = 200 * 1024;
3114 if (socket->sk->sk_rcvbuf < (140 * 1024))
3115 socket->sk->sk_rcvbuf = 140 * 1024;
3116 }
3117
3118 if (server->tcp_nodelay) {
3119 int val = 1;
3120 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3121 (char *)&val, sizeof(val));
3122 if (rc)
3123 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3124 rc);
3125 }
3126
3127 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3128 socket->sk->sk_sndbuf,
3129 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3130
3131 rc = socket->ops->connect(socket, saddr, slen, 0);
3132 if (rc < 0) {
3133 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3134 sock_release(socket);
3135 server->ssocket = NULL;
3136 return rc;
3137 }
3138
3139 if (sport == htons(RFC1001_PORT))
3140 rc = ip_rfc1001_connect(server);
3141
3142 return rc;
3143}
3144
3145static int
3146ip_connect(struct TCP_Server_Info *server)
3147{
3148 __be16 *sport;
3149 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3150 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3151
3152 if (server->dstaddr.ss_family == AF_INET6)
3153 sport = &addr6->sin6_port;
3154 else
3155 sport = &addr->sin_port;
3156
3157 if (*sport == 0) {
3158 int rc;
3159
3160 /* try with 445 port at first */
3161 *sport = htons(CIFS_PORT);
3162
3163 rc = generic_ip_connect(server);
3164 if (rc >= 0)
3165 return rc;
3166
3167 /* if it failed, try with 139 port */
3168 *sport = htons(RFC1001_PORT);
3169 }
3170
3171 return generic_ip_connect(server);
3172}
3173
3174void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3175 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3176{
3177 /* if we are reconnecting then should we check to see if
3178 * any requested capabilities changed locally e.g. via
3179 * remount but we can not do much about it here
3180 * if they have (even if we could detect it by the following)
3181 * Perhaps we could add a backpointer to array of sb from tcon
3182 * or if we change to make all sb to same share the same
3183 * sb as NFS - then we only have one backpointer to sb.
3184 * What if we wanted to mount the server share twice once with
3185 * and once without posixacls or posix paths? */
3186 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3187
3188 if (vol_info && vol_info->no_linux_ext) {
3189 tcon->fsUnixInfo.Capability = 0;
3190 tcon->unix_ext = 0; /* Unix Extensions disabled */
3191 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3192 return;
3193 } else if (vol_info)
3194 tcon->unix_ext = 1; /* Unix Extensions supported */
3195
3196 if (tcon->unix_ext == 0) {
3197 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3198 return;
3199 }
3200
3201 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3202 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3203 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3204 /* check for reconnect case in which we do not
3205 want to change the mount behavior if we can avoid it */
3206 if (vol_info == NULL) {
3207 /* turn off POSIX ACL and PATHNAMES if not set
3208 originally at mount time */
3209 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3210 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3211 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3212 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3213 cifs_dbg(VFS, "POSIXPATH support change\n");
3214 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3215 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3216 cifs_dbg(VFS, "possible reconnect error\n");
3217 cifs_dbg(VFS, "server disabled POSIX path support\n");
3218 }
3219 }
3220
3221 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3222 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3223
3224 cap &= CIFS_UNIX_CAP_MASK;
3225 if (vol_info && vol_info->no_psx_acl)
3226 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3227 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3228 cifs_dbg(FYI, "negotiated posix acl support\n");
3229 if (cifs_sb)
3230 cifs_sb->mnt_cifs_flags |=
3231 CIFS_MOUNT_POSIXACL;
3232 }
3233
3234 if (vol_info && vol_info->posix_paths == 0)
3235 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3236 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3237 cifs_dbg(FYI, "negotiate posix pathnames\n");
3238 if (cifs_sb)
3239 cifs_sb->mnt_cifs_flags |=
3240 CIFS_MOUNT_POSIX_PATHS;
3241 }
3242
3243 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3244#ifdef CONFIG_CIFS_DEBUG2
3245 if (cap & CIFS_UNIX_FCNTL_CAP)
3246 cifs_dbg(FYI, "FCNTL cap\n");
3247 if (cap & CIFS_UNIX_EXTATTR_CAP)
3248 cifs_dbg(FYI, "EXTATTR cap\n");
3249 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3250 cifs_dbg(FYI, "POSIX path cap\n");
3251 if (cap & CIFS_UNIX_XATTR_CAP)
3252 cifs_dbg(FYI, "XATTR cap\n");
3253 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3254 cifs_dbg(FYI, "POSIX ACL cap\n");
3255 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3256 cifs_dbg(FYI, "very large read cap\n");
3257 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3258 cifs_dbg(FYI, "very large write cap\n");
3259 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3260 cifs_dbg(FYI, "transport encryption cap\n");
3261 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3262 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3263#endif /* CIFS_DEBUG2 */
3264 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3265 if (vol_info == NULL) {
3266 cifs_dbg(FYI, "resetting capabilities failed\n");
3267 } else
3268 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3269
3270 }
3271 }
3272}
3273
3274void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3275 struct cifs_sb_info *cifs_sb)
3276{
3277 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3278
3279 spin_lock_init(&cifs_sb->tlink_tree_lock);
3280 cifs_sb->tlink_tree = RB_ROOT;
3281
3282 /*
3283 * Temporarily set r/wsize for matching superblock. If we end up using
3284 * new sb then client will later negotiate it downward if needed.
3285 */
3286 cifs_sb->rsize = pvolume_info->rsize;
3287 cifs_sb->wsize = pvolume_info->wsize;
3288
3289 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3290 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3291 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3292 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3293 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3294 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3295
3296 cifs_sb->actimeo = pvolume_info->actimeo;
3297 cifs_sb->local_nls = pvolume_info->local_nls;
3298
3299 if (pvolume_info->noperm)
3300 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3301 if (pvolume_info->setuids)
3302 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3303 if (pvolume_info->server_ino)
3304 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3305 if (pvolume_info->remap)
3306 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3307 if (pvolume_info->sfu_remap)
3308 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3309 if (pvolume_info->no_xattr)
3310 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3311 if (pvolume_info->sfu_emul)
3312 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3313 if (pvolume_info->nobrl)
3314 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3315 if (pvolume_info->nostrictsync)
3316 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3317 if (pvolume_info->mand_lock)
3318 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3319 if (pvolume_info->rwpidforward)
3320 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3321 if (pvolume_info->cifs_acl)
3322 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3323 if (pvolume_info->backupuid_specified) {
3324 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3325 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3326 }
3327 if (pvolume_info->backupgid_specified) {
3328 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3329 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3330 }
3331 if (pvolume_info->override_uid)
3332 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3333 if (pvolume_info->override_gid)
3334 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3335 if (pvolume_info->dynperm)
3336 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3337 if (pvolume_info->fsc)
3338 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3339 if (pvolume_info->multiuser)
3340 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3341 CIFS_MOUNT_NO_PERM);
3342 if (pvolume_info->strict_io)
3343 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3344 if (pvolume_info->direct_io) {
3345 cifs_dbg(FYI, "mounting share using direct i/o\n");
3346 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3347 }
3348 if (pvolume_info->mfsymlinks) {
3349 if (pvolume_info->sfu_emul) {
3350 /*
3351 * Our SFU ("Services for Unix" emulation does not allow
3352 * creating symlinks but does allow reading existing SFU
3353 * symlinks (it does allow both creating and reading SFU
3354 * style mknod and FIFOs though). When "mfsymlinks" and
3355 * "sfu" are both enabled at the same time, it allows
3356 * reading both types of symlinks, but will only create
3357 * them with mfsymlinks format. This allows better
3358 * Apple compatibility (probably better for Samba too)
3359 * while still recognizing old Windows style symlinks.
3360 */
3361 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3362 }
3363 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3364 }
3365
3366 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3367 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3368}
3369
3370static void
3371cleanup_volume_info_contents(struct smb_vol *volume_info)
3372{
3373 kfree(volume_info->username);
3374 kzfree(volume_info->password);
3375 kfree(volume_info->UNC);
3376 kfree(volume_info->domainname);
3377 kfree(volume_info->iocharset);
3378 kfree(volume_info->prepath);
3379}
3380
3381void
3382cifs_cleanup_volume_info(struct smb_vol *volume_info)
3383{
3384 if (!volume_info)
3385 return;
3386 cleanup_volume_info_contents(volume_info);
3387 kfree(volume_info);
3388}
3389
3390
3391#ifdef CONFIG_CIFS_DFS_UPCALL
3392/*
3393 * cifs_build_path_to_root returns full path to root when we do not have an
3394 * exiting connection (tcon)
3395 */
3396static char *
3397build_unc_path_to_root(const struct smb_vol *vol,
3398 const struct cifs_sb_info *cifs_sb)
3399{
3400 char *full_path, *pos;
3401 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3402 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3403
3404 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3405 if (full_path == NULL)
3406 return ERR_PTR(-ENOMEM);
3407
3408 strncpy(full_path, vol->UNC, unc_len);
3409 pos = full_path + unc_len;
3410
3411 if (pplen) {
3412 *pos = CIFS_DIR_SEP(cifs_sb);
3413 strncpy(pos + 1, vol->prepath, pplen);
3414 pos += pplen;
3415 }
3416
3417 *pos = '\0'; /* add trailing null */
3418 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3419 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3420 return full_path;
3421}
3422
3423/*
3424 * Perform a dfs referral query for a share and (optionally) prefix
3425 *
3426 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3427 * to a string containing updated options for the submount. Otherwise it
3428 * will be left untouched.
3429 *
3430 * Returns the rc from get_dfs_path to the caller, which can be used to
3431 * determine whether there were referrals.
3432 */
3433static int
3434expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3435 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3436 int check_prefix)
3437{
3438 int rc;
3439 unsigned int num_referrals = 0;
3440 struct dfs_info3_param *referrals = NULL;
3441 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3442
3443 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3444 if (IS_ERR(full_path))
3445 return PTR_ERR(full_path);
3446
3447 /* For DFS paths, skip the first '\' of the UNC */
3448 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3449
3450 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3451 &num_referrals, &referrals, cifs_remap(cifs_sb));
3452
3453 if (!rc && num_referrals > 0) {
3454 char *fake_devname = NULL;
3455
3456 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3457 full_path + 1, referrals,
3458 &fake_devname);
3459
3460 free_dfs_info_array(referrals, num_referrals);
3461
3462 if (IS_ERR(mdata)) {
3463 rc = PTR_ERR(mdata);
3464 mdata = NULL;
3465 } else {
3466 cleanup_volume_info_contents(volume_info);
3467 rc = cifs_setup_volume_info(volume_info, mdata,
3468 fake_devname);
3469 }
3470 kfree(fake_devname);
3471 kfree(cifs_sb->mountdata);
3472 cifs_sb->mountdata = mdata;
3473 }
3474 kfree(full_path);
3475 return rc;
3476}
3477#endif
3478
3479static int
3480cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3481 const char *devname)
3482{
3483 int rc = 0;
3484
3485 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3486 return -EINVAL;
3487
3488 if (volume_info->nullauth) {
3489 cifs_dbg(FYI, "Anonymous login\n");
3490 kfree(volume_info->username);
3491 volume_info->username = NULL;
3492 } else if (volume_info->username) {
3493 /* BB fixme parse for domain name here */
3494 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3495 } else {
3496 cifs_dbg(VFS, "No username specified\n");
3497 /* In userspace mount helper we can get user name from alternate
3498 locations such as env variables and files on disk */
3499 return -EINVAL;
3500 }
3501
3502 /* this is needed for ASCII cp to Unicode converts */
3503 if (volume_info->iocharset == NULL) {
3504 /* load_nls_default cannot return null */
3505 volume_info->local_nls = load_nls_default();
3506 } else {
3507 volume_info->local_nls = load_nls(volume_info->iocharset);
3508 if (volume_info->local_nls == NULL) {
3509 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3510 volume_info->iocharset);
3511 return -ELIBACC;
3512 }
3513 }
3514
3515 return rc;
3516}
3517
3518struct smb_vol *
3519cifs_get_volume_info(char *mount_data, const char *devname)
3520{
3521 int rc;
3522 struct smb_vol *volume_info;
3523
3524 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3525 if (!volume_info)
3526 return ERR_PTR(-ENOMEM);
3527
3528 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3529 if (rc) {
3530 cifs_cleanup_volume_info(volume_info);
3531 volume_info = ERR_PTR(rc);
3532 }
3533
3534 return volume_info;
3535}
3536
3537int
3538cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3539{
3540 int rc;
3541 unsigned int xid;
3542 struct cifs_ses *ses;
3543 struct cifs_tcon *tcon;
3544 struct TCP_Server_Info *server;
3545 char *full_path;
3546 struct tcon_link *tlink;
3547#ifdef CONFIG_CIFS_DFS_UPCALL
3548 int referral_walks_count = 0;
3549#endif
3550
3551 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3552 if (rc)
3553 return rc;
3554
3555#ifdef CONFIG_CIFS_DFS_UPCALL
3556try_mount_again:
3557 /* cleanup activities if we're chasing a referral */
3558 if (referral_walks_count) {
3559 if (tcon)
3560 cifs_put_tcon(tcon);
3561 else if (ses)
3562 cifs_put_smb_ses(ses);
3563
3564 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3565
3566 free_xid(xid);
3567 }
3568#endif
3569 rc = 0;
3570 tcon = NULL;
3571 ses = NULL;
3572 server = NULL;
3573 full_path = NULL;
3574 tlink = NULL;
3575
3576 xid = get_xid();
3577
3578 /* get a reference to a tcp session */
3579 server = cifs_get_tcp_session(volume_info);
3580 if (IS_ERR(server)) {
3581 rc = PTR_ERR(server);
3582 bdi_destroy(&cifs_sb->bdi);
3583 goto out;
3584 }
3585
3586 /* get a reference to a SMB session */
3587 ses = cifs_get_smb_ses(server, volume_info);
3588 if (IS_ERR(ses)) {
3589 rc = PTR_ERR(ses);
3590 ses = NULL;
3591 goto mount_fail_check;
3592 }
3593
3594#ifdef CONFIG_CIFS_SMB2
3595 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3596 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3597 cifs_dbg(VFS, "persistent handles not supported by server\n");
3598 rc = -EOPNOTSUPP;
3599 goto mount_fail_check;
3600 }
3601#endif /* CONFIG_CIFS_SMB2*/
3602
3603 /* search for existing tcon to this server share */
3604 tcon = cifs_get_tcon(ses, volume_info);
3605 if (IS_ERR(tcon)) {
3606 rc = PTR_ERR(tcon);
3607 tcon = NULL;
3608 goto remote_path_check;
3609 }
3610
3611 /* tell server which Unix caps we support */
3612 if (cap_unix(tcon->ses)) {
3613 /* reset of caps checks mount to see if unix extensions
3614 disabled for just this mount */
3615 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3616 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3617 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3618 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3619 rc = -EACCES;
3620 goto mount_fail_check;
3621 }
3622 } else
3623 tcon->unix_ext = 0; /* server does not support them */
3624
3625 /* do not care if a following call succeed - informational */
3626 if (!tcon->ipc && server->ops->qfs_tcon)
3627 server->ops->qfs_tcon(xid, tcon);
3628
3629 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3630 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3631
3632 /* tune readahead according to rsize */
3633 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
3634
3635remote_path_check:
3636#ifdef CONFIG_CIFS_DFS_UPCALL
3637 /*
3638 * Perform an unconditional check for whether there are DFS
3639 * referrals for this path without prefix, to provide support
3640 * for DFS referrals from w2k8 servers which don't seem to respond
3641 * with PATH_NOT_COVERED to requests that include the prefix.
3642 * Chase the referral if found, otherwise continue normally.
3643 */
3644 if (referral_walks_count == 0) {
3645 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3646 false);
3647 if (!refrc) {
3648 referral_walks_count++;
3649 goto try_mount_again;
3650 }
3651 }
3652#endif
3653
3654 /* check if a whole path is not remote */
3655 if (!rc && tcon) {
3656 if (!server->ops->is_path_accessible) {
3657 rc = -ENOSYS;
3658 goto mount_fail_check;
3659 }
3660 /*
3661 * cifs_build_path_to_root works only when we have a valid tcon
3662 */
3663 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3664 if (full_path == NULL) {
3665 rc = -ENOMEM;
3666 goto mount_fail_check;
3667 }
3668 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3669 full_path);
3670 if (rc != 0 && rc != -EREMOTE) {
3671 kfree(full_path);
3672 goto mount_fail_check;
3673 }
3674 kfree(full_path);
3675 }
3676
3677 /* get referral if needed */
3678 if (rc == -EREMOTE) {
3679#ifdef CONFIG_CIFS_DFS_UPCALL
3680 if (referral_walks_count > MAX_NESTED_LINKS) {
3681 /*
3682 * BB: when we implement proper loop detection,
3683 * we will remove this check. But now we need it
3684 * to prevent an indefinite loop if 'DFS tree' is
3685 * misconfigured (i.e. has loops).
3686 */
3687 rc = -ELOOP;
3688 goto mount_fail_check;
3689 }
3690
3691 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3692
3693 if (!rc) {
3694 referral_walks_count++;
3695 goto try_mount_again;
3696 }
3697 goto mount_fail_check;
3698#else /* No DFS support, return error on mount */
3699 rc = -EOPNOTSUPP;
3700#endif
3701 }
3702
3703 if (rc)
3704 goto mount_fail_check;
3705
3706 /* now, hang the tcon off of the superblock */
3707 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3708 if (tlink == NULL) {
3709 rc = -ENOMEM;
3710 goto mount_fail_check;
3711 }
3712
3713 tlink->tl_uid = ses->linux_uid;
3714 tlink->tl_tcon = tcon;
3715 tlink->tl_time = jiffies;
3716 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3717 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3718
3719 cifs_sb->master_tlink = tlink;
3720 spin_lock(&cifs_sb->tlink_tree_lock);
3721 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3722 spin_unlock(&cifs_sb->tlink_tree_lock);
3723
3724 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3725 TLINK_IDLE_EXPIRE);
3726
3727mount_fail_check:
3728 /* on error free sesinfo and tcon struct if needed */
3729 if (rc) {
3730 /* If find_unc succeeded then rc == 0 so we can not end */
3731 /* up accidentally freeing someone elses tcon struct */
3732 if (tcon)
3733 cifs_put_tcon(tcon);
3734 else if (ses)
3735 cifs_put_smb_ses(ses);
3736 else
3737 cifs_put_tcp_session(server);
3738 bdi_destroy(&cifs_sb->bdi);
3739 }
3740
3741out:
3742 free_xid(xid);
3743 return rc;
3744}
3745
3746/*
3747 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3748 * pointer may be NULL.
3749 */
3750int
3751CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3752 const char *tree, struct cifs_tcon *tcon,
3753 const struct nls_table *nls_codepage)
3754{
3755 struct smb_hdr *smb_buffer;
3756 struct smb_hdr *smb_buffer_response;
3757 TCONX_REQ *pSMB;
3758 TCONX_RSP *pSMBr;
3759 unsigned char *bcc_ptr;
3760 int rc = 0;
3761 int length;
3762 __u16 bytes_left, count;
3763
3764 if (ses == NULL)
3765 return -EIO;
3766
3767 smb_buffer = cifs_buf_get();
3768 if (smb_buffer == NULL)
3769 return -ENOMEM;
3770
3771 smb_buffer_response = smb_buffer;
3772
3773 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3774 NULL /*no tid */ , 4 /*wct */ );
3775
3776 smb_buffer->Mid = get_next_mid(ses->server);
3777 smb_buffer->Uid = ses->Suid;
3778 pSMB = (TCONX_REQ *) smb_buffer;
3779 pSMBr = (TCONX_RSP *) smb_buffer_response;
3780
3781 pSMB->AndXCommand = 0xFF;
3782 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3783 bcc_ptr = &pSMB->Password[0];
3784 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3785 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3786 *bcc_ptr = 0; /* password is null byte */
3787 bcc_ptr++; /* skip password */
3788 /* already aligned so no need to do it below */
3789 } else {
3790 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3791 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3792 specified as required (when that support is added to
3793 the vfs in the future) as only NTLM or the much
3794 weaker LANMAN (which we do not send by default) is accepted
3795 by Samba (not sure whether other servers allow
3796 NTLMv2 password here) */
3797#ifdef CONFIG_CIFS_WEAK_PW_HASH
3798 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3799 (ses->sectype == LANMAN))
3800 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3801 ses->server->sec_mode &
3802 SECMODE_PW_ENCRYPT ? true : false,
3803 bcc_ptr);
3804 else
3805#endif /* CIFS_WEAK_PW_HASH */
3806 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3807 bcc_ptr, nls_codepage);
3808 if (rc) {
3809 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3810 __func__, rc);
3811 cifs_buf_release(smb_buffer);
3812 return rc;
3813 }
3814
3815 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3816 if (ses->capabilities & CAP_UNICODE) {
3817 /* must align unicode strings */
3818 *bcc_ptr = 0; /* null byte password */
3819 bcc_ptr++;
3820 }
3821 }
3822
3823 if (ses->server->sign)
3824 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3825
3826 if (ses->capabilities & CAP_STATUS32) {
3827 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3828 }
3829 if (ses->capabilities & CAP_DFS) {
3830 smb_buffer->Flags2 |= SMBFLG2_DFS;
3831 }
3832 if (ses->capabilities & CAP_UNICODE) {
3833 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3834 length =
3835 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3836 6 /* max utf8 char length in bytes */ *
3837 (/* server len*/ + 256 /* share len */), nls_codepage);
3838 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3839 bcc_ptr += 2; /* skip trailing null */
3840 } else { /* ASCII */
3841 strcpy(bcc_ptr, tree);
3842 bcc_ptr += strlen(tree) + 1;
3843 }
3844 strcpy(bcc_ptr, "?????");
3845 bcc_ptr += strlen("?????");
3846 bcc_ptr += 1;
3847 count = bcc_ptr - &pSMB->Password[0];
3848 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3849 pSMB->hdr.smb_buf_length) + count);
3850 pSMB->ByteCount = cpu_to_le16(count);
3851
3852 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3853 0);
3854
3855 /* above now done in SendReceive */
3856 if ((rc == 0) && (tcon != NULL)) {
3857 bool is_unicode;
3858
3859 tcon->tidStatus = CifsGood;
3860 tcon->need_reconnect = false;
3861 tcon->tid = smb_buffer_response->Tid;
3862 bcc_ptr = pByteArea(smb_buffer_response);
3863 bytes_left = get_bcc(smb_buffer_response);
3864 length = strnlen(bcc_ptr, bytes_left - 2);
3865 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3866 is_unicode = true;
3867 else
3868 is_unicode = false;
3869
3870
3871 /* skip service field (NB: this field is always ASCII) */
3872 if (length == 3) {
3873 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3874 (bcc_ptr[2] == 'C')) {
3875 cifs_dbg(FYI, "IPC connection\n");
3876 tcon->ipc = 1;
3877 }
3878 } else if (length == 2) {
3879 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3880 /* the most common case */
3881 cifs_dbg(FYI, "disk share connection\n");
3882 }
3883 }
3884 bcc_ptr += length + 1;
3885 bytes_left -= (length + 1);
3886 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3887
3888 /* mostly informational -- no need to fail on error here */
3889 kfree(tcon->nativeFileSystem);
3890 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3891 bytes_left, is_unicode,
3892 nls_codepage);
3893
3894 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3895
3896 if ((smb_buffer_response->WordCount == 3) ||
3897 (smb_buffer_response->WordCount == 7))
3898 /* field is in same location */
3899 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3900 else
3901 tcon->Flags = 0;
3902 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3903 } else if ((rc == 0) && tcon == NULL) {
3904 /* all we need to save for IPC$ connection */
3905 ses->ipc_tid = smb_buffer_response->Tid;
3906 }
3907
3908 cifs_buf_release(smb_buffer);
3909 return rc;
3910}
3911
3912static void delayed_free(struct rcu_head *p)
3913{
3914 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3915 unload_nls(sbi->local_nls);
3916 kfree(sbi);
3917}
3918
3919void
3920cifs_umount(struct cifs_sb_info *cifs_sb)
3921{
3922 struct rb_root *root = &cifs_sb->tlink_tree;
3923 struct rb_node *node;
3924 struct tcon_link *tlink;
3925
3926 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3927
3928 spin_lock(&cifs_sb->tlink_tree_lock);
3929 while ((node = rb_first(root))) {
3930 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3931 cifs_get_tlink(tlink);
3932 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3933 rb_erase(node, root);
3934
3935 spin_unlock(&cifs_sb->tlink_tree_lock);
3936 cifs_put_tlink(tlink);
3937 spin_lock(&cifs_sb->tlink_tree_lock);
3938 }
3939 spin_unlock(&cifs_sb->tlink_tree_lock);
3940
3941 bdi_destroy(&cifs_sb->bdi);
3942 kfree(cifs_sb->mountdata);
3943 call_rcu(&cifs_sb->rcu, delayed_free);
3944}
3945
3946int
3947cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3948{
3949 int rc = 0;
3950 struct TCP_Server_Info *server = ses->server;
3951
3952 if (!server->ops->need_neg || !server->ops->negotiate)
3953 return -ENOSYS;
3954
3955 /* only send once per connect */
3956 if (!server->ops->need_neg(server))
3957 return 0;
3958
3959 set_credits(server, 1);
3960
3961 rc = server->ops->negotiate(xid, ses);
3962 if (rc == 0) {
3963 spin_lock(&GlobalMid_Lock);
3964 if (server->tcpStatus == CifsNeedNegotiate)
3965 server->tcpStatus = CifsGood;
3966 else
3967 rc = -EHOSTDOWN;
3968 spin_unlock(&GlobalMid_Lock);
3969 }
3970
3971 return rc;
3972}
3973
3974int
3975cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3976 struct nls_table *nls_info)
3977{
3978 int rc = -ENOSYS;
3979 struct TCP_Server_Info *server = ses->server;
3980
3981 ses->capabilities = server->capabilities;
3982 if (linuxExtEnabled == 0)
3983 ses->capabilities &= (~server->vals->cap_unix);
3984
3985 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3986 server->sec_mode, server->capabilities, server->timeAdj);
3987
3988 if (server->ops->sess_setup)
3989 rc = server->ops->sess_setup(xid, ses, nls_info);
3990
3991 if (rc)
3992 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3993
3994 return rc;
3995}
3996
3997static int
3998cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3999{
4000 vol->sectype = ses->sectype;
4001
4002 /* krb5 is special, since we don't need username or pw */
4003 if (vol->sectype == Kerberos)
4004 return 0;
4005
4006 return cifs_set_cifscreds(vol, ses);
4007}
4008
4009static struct cifs_tcon *
4010cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4011{
4012 int rc;
4013 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4014 struct cifs_ses *ses;
4015 struct cifs_tcon *tcon = NULL;
4016 struct smb_vol *vol_info;
4017
4018 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4019 if (vol_info == NULL)
4020 return ERR_PTR(-ENOMEM);
4021
4022 vol_info->local_nls = cifs_sb->local_nls;
4023 vol_info->linux_uid = fsuid;
4024 vol_info->cred_uid = fsuid;
4025 vol_info->UNC = master_tcon->treeName;
4026 vol_info->retry = master_tcon->retry;
4027 vol_info->nocase = master_tcon->nocase;
4028 vol_info->local_lease = master_tcon->local_lease;
4029 vol_info->no_linux_ext = !master_tcon->unix_ext;
4030 vol_info->sectype = master_tcon->ses->sectype;
4031 vol_info->sign = master_tcon->ses->sign;
4032
4033 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4034 if (rc) {
4035 tcon = ERR_PTR(rc);
4036 goto out;
4037 }
4038
4039 /* get a reference for the same TCP session */
4040 spin_lock(&cifs_tcp_ses_lock);
4041 ++master_tcon->ses->server->srv_count;
4042 spin_unlock(&cifs_tcp_ses_lock);
4043
4044 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4045 if (IS_ERR(ses)) {
4046 tcon = (struct cifs_tcon *)ses;
4047 cifs_put_tcp_session(master_tcon->ses->server);
4048 goto out;
4049 }
4050
4051 tcon = cifs_get_tcon(ses, vol_info);
4052 if (IS_ERR(tcon)) {
4053 cifs_put_smb_ses(ses);
4054 goto out;
4055 }
4056
4057 if (cap_unix(ses))
4058 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4059out:
4060 kfree(vol_info->username);
4061 kfree(vol_info->password);
4062 kfree(vol_info);
4063
4064 return tcon;
4065}
4066
4067struct cifs_tcon *
4068cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4069{
4070 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4071}
4072
4073/* find and return a tlink with given uid */
4074static struct tcon_link *
4075tlink_rb_search(struct rb_root *root, kuid_t uid)
4076{
4077 struct rb_node *node = root->rb_node;
4078 struct tcon_link *tlink;
4079
4080 while (node) {
4081 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4082
4083 if (uid_gt(tlink->tl_uid, uid))
4084 node = node->rb_left;
4085 else if (uid_lt(tlink->tl_uid, uid))
4086 node = node->rb_right;
4087 else
4088 return tlink;
4089 }
4090 return NULL;
4091}
4092
4093/* insert a tcon_link into the tree */
4094static void
4095tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4096{
4097 struct rb_node **new = &(root->rb_node), *parent = NULL;
4098 struct tcon_link *tlink;
4099
4100 while (*new) {
4101 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4102 parent = *new;
4103
4104 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4105 new = &((*new)->rb_left);
4106 else
4107 new = &((*new)->rb_right);
4108 }
4109
4110 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4111 rb_insert_color(&new_tlink->tl_rbnode, root);
4112}
4113
4114/*
4115 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4116 * current task.
4117 *
4118 * If the superblock doesn't refer to a multiuser mount, then just return
4119 * the master tcon for the mount.
4120 *
4121 * First, search the rbtree for an existing tcon for this fsuid. If one
4122 * exists, then check to see if it's pending construction. If it is then wait
4123 * for construction to complete. Once it's no longer pending, check to see if
4124 * it failed and either return an error or retry construction, depending on
4125 * the timeout.
4126 *
4127 * If one doesn't exist then insert a new tcon_link struct into the tree and
4128 * try to construct a new one.
4129 */
4130struct tcon_link *
4131cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4132{
4133 int ret;
4134 kuid_t fsuid = current_fsuid();
4135 struct tcon_link *tlink, *newtlink;
4136
4137 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4138 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4139
4140 spin_lock(&cifs_sb->tlink_tree_lock);
4141 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4142 if (tlink)
4143 cifs_get_tlink(tlink);
4144 spin_unlock(&cifs_sb->tlink_tree_lock);
4145
4146 if (tlink == NULL) {
4147 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4148 if (newtlink == NULL)
4149 return ERR_PTR(-ENOMEM);
4150 newtlink->tl_uid = fsuid;
4151 newtlink->tl_tcon = ERR_PTR(-EACCES);
4152 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4153 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4154 cifs_get_tlink(newtlink);
4155
4156 spin_lock(&cifs_sb->tlink_tree_lock);
4157 /* was one inserted after previous search? */
4158 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4159 if (tlink) {
4160 cifs_get_tlink(tlink);
4161 spin_unlock(&cifs_sb->tlink_tree_lock);
4162 kfree(newtlink);
4163 goto wait_for_construction;
4164 }
4165 tlink = newtlink;
4166 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4167 spin_unlock(&cifs_sb->tlink_tree_lock);
4168 } else {
4169wait_for_construction:
4170 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4171 TASK_INTERRUPTIBLE);
4172 if (ret) {
4173 cifs_put_tlink(tlink);
4174 return ERR_PTR(-ERESTARTSYS);
4175 }
4176
4177 /* if it's good, return it */
4178 if (!IS_ERR(tlink->tl_tcon))
4179 return tlink;
4180
4181 /* return error if we tried this already recently */
4182 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4183 cifs_put_tlink(tlink);
4184 return ERR_PTR(-EACCES);
4185 }
4186
4187 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4188 goto wait_for_construction;
4189 }
4190
4191 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4192 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4193 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4194
4195 if (IS_ERR(tlink->tl_tcon)) {
4196 cifs_put_tlink(tlink);
4197 return ERR_PTR(-EACCES);
4198 }
4199
4200 return tlink;
4201}
4202
4203/*
4204 * periodic workqueue job that scans tcon_tree for a superblock and closes
4205 * out tcons.
4206 */
4207static void
4208cifs_prune_tlinks(struct work_struct *work)
4209{
4210 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4211 prune_tlinks.work);
4212 struct rb_root *root = &cifs_sb->tlink_tree;
4213 struct rb_node *node = rb_first(root);
4214 struct rb_node *tmp;
4215 struct tcon_link *tlink;
4216
4217 /*
4218 * Because we drop the spinlock in the loop in order to put the tlink
4219 * it's not guarded against removal of links from the tree. The only
4220 * places that remove entries from the tree are this function and
4221 * umounts. Because this function is non-reentrant and is canceled
4222 * before umount can proceed, this is safe.
4223 */
4224 spin_lock(&cifs_sb->tlink_tree_lock);
4225 node = rb_first(root);
4226 while (node != NULL) {
4227 tmp = node;
4228 node = rb_next(tmp);
4229 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4230
4231 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4232 atomic_read(&tlink->tl_count) != 0 ||
4233 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4234 continue;
4235
4236 cifs_get_tlink(tlink);
4237 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4238 rb_erase(tmp, root);
4239
4240 spin_unlock(&cifs_sb->tlink_tree_lock);
4241 cifs_put_tlink(tlink);
4242 spin_lock(&cifs_sb->tlink_tree_lock);
4243 }
4244 spin_unlock(&cifs_sb->tlink_tree_lock);
4245
4246 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4247 TLINK_IDLE_EXPIRE);
4248}