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CIFS: Fix fast lease break after open problem
[deliverable/linux.git] / fs / cifs / connect.c
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
59 extern 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
65 enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_noblocksend, Opt_noautotune,
71 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
72 Opt_mapchars, Opt_nomapchars, Opt_sfu,
73 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
74 Opt_noposixpaths, Opt_nounix,
75 Opt_nocase,
76 Opt_brl, Opt_nobrl,
77 Opt_forcemandatorylock, Opt_setuids,
78 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
79 Opt_nohard, Opt_nosoft,
80 Opt_nointr, Opt_intr,
81 Opt_nostrictsync, Opt_strictsync,
82 Opt_serverino, Opt_noserverino,
83 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
84 Opt_acl, Opt_noacl, Opt_locallease,
85 Opt_sign, Opt_seal, Opt_direct,
86 Opt_strictcache, Opt_noac,
87 Opt_fsc, Opt_mfsymlinks,
88 Opt_multiuser, Opt_sloppy,
89
90 /* Mount options which take numeric value */
91 Opt_backupuid, Opt_backupgid, Opt_uid,
92 Opt_cruid, Opt_gid, Opt_file_mode,
93 Opt_dirmode, Opt_port,
94 Opt_rsize, Opt_wsize, Opt_actimeo,
95
96 /* Mount options which take string value */
97 Opt_user, Opt_pass, Opt_ip,
98 Opt_unc, Opt_domain,
99 Opt_srcaddr, Opt_prefixpath,
100 Opt_iocharset, Opt_sockopt,
101 Opt_netbiosname, Opt_servern,
102 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
103
104 /* Mount options to be ignored */
105 Opt_ignore,
106
107 /* Options which could be blank */
108 Opt_blank_pass,
109 Opt_blank_user,
110 Opt_blank_ip,
111
112 Opt_err
113 };
114
115 static const match_table_t cifs_mount_option_tokens = {
116
117 { Opt_user_xattr, "user_xattr" },
118 { Opt_nouser_xattr, "nouser_xattr" },
119 { Opt_forceuid, "forceuid" },
120 { Opt_noforceuid, "noforceuid" },
121 { Opt_noblocksend, "noblocksend" },
122 { Opt_noautotune, "noautotune" },
123 { Opt_hard, "hard" },
124 { Opt_soft, "soft" },
125 { Opt_perm, "perm" },
126 { Opt_noperm, "noperm" },
127 { Opt_mapchars, "mapchars" },
128 { Opt_nomapchars, "nomapchars" },
129 { Opt_sfu, "sfu" },
130 { Opt_nosfu, "nosfu" },
131 { Opt_nodfs, "nodfs" },
132 { Opt_posixpaths, "posixpaths" },
133 { Opt_noposixpaths, "noposixpaths" },
134 { Opt_nounix, "nounix" },
135 { Opt_nounix, "nolinux" },
136 { Opt_nocase, "nocase" },
137 { Opt_nocase, "ignorecase" },
138 { Opt_brl, "brl" },
139 { Opt_nobrl, "nobrl" },
140 { Opt_nobrl, "nolock" },
141 { Opt_forcemandatorylock, "forcemandatorylock" },
142 { Opt_forcemandatorylock, "forcemand" },
143 { Opt_setuids, "setuids" },
144 { Opt_nosetuids, "nosetuids" },
145 { Opt_dynperm, "dynperm" },
146 { Opt_nodynperm, "nodynperm" },
147 { Opt_nohard, "nohard" },
148 { Opt_nosoft, "nosoft" },
149 { Opt_nointr, "nointr" },
150 { Opt_intr, "intr" },
151 { Opt_nostrictsync, "nostrictsync" },
152 { Opt_strictsync, "strictsync" },
153 { Opt_serverino, "serverino" },
154 { Opt_noserverino, "noserverino" },
155 { Opt_rwpidforward, "rwpidforward" },
156 { Opt_cifsacl, "cifsacl" },
157 { Opt_nocifsacl, "nocifsacl" },
158 { Opt_acl, "acl" },
159 { Opt_noacl, "noacl" },
160 { Opt_locallease, "locallease" },
161 { Opt_sign, "sign" },
162 { Opt_seal, "seal" },
163 { Opt_direct, "direct" },
164 { Opt_direct, "directio" },
165 { Opt_direct, "forcedirectio" },
166 { Opt_strictcache, "strictcache" },
167 { Opt_noac, "noac" },
168 { Opt_fsc, "fsc" },
169 { Opt_mfsymlinks, "mfsymlinks" },
170 { Opt_multiuser, "multiuser" },
171 { Opt_sloppy, "sloppy" },
172
173 { Opt_backupuid, "backupuid=%s" },
174 { Opt_backupgid, "backupgid=%s" },
175 { Opt_uid, "uid=%s" },
176 { Opt_cruid, "cruid=%s" },
177 { Opt_gid, "gid=%s" },
178 { Opt_file_mode, "file_mode=%s" },
179 { Opt_dirmode, "dirmode=%s" },
180 { Opt_dirmode, "dir_mode=%s" },
181 { Opt_port, "port=%s" },
182 { Opt_rsize, "rsize=%s" },
183 { Opt_wsize, "wsize=%s" },
184 { Opt_actimeo, "actimeo=%s" },
185
186 { Opt_blank_user, "user=" },
187 { Opt_blank_user, "username=" },
188 { Opt_user, "user=%s" },
189 { Opt_user, "username=%s" },
190 { Opt_blank_pass, "pass=" },
191 { Opt_pass, "pass=%s" },
192 { Opt_pass, "password=%s" },
193 { Opt_blank_ip, "ip=" },
194 { Opt_blank_ip, "addr=" },
195 { Opt_ip, "ip=%s" },
196 { Opt_ip, "addr=%s" },
197 { Opt_unc, "unc=%s" },
198 { Opt_unc, "target=%s" },
199 { Opt_unc, "path=%s" },
200 { Opt_domain, "dom=%s" },
201 { Opt_domain, "domain=%s" },
202 { Opt_domain, "workgroup=%s" },
203 { Opt_srcaddr, "srcaddr=%s" },
204 { Opt_prefixpath, "prefixpath=%s" },
205 { Opt_iocharset, "iocharset=%s" },
206 { Opt_sockopt, "sockopt=%s" },
207 { Opt_netbiosname, "netbiosname=%s" },
208 { Opt_servern, "servern=%s" },
209 { Opt_ver, "ver=%s" },
210 { Opt_vers, "vers=%s" },
211 { Opt_sec, "sec=%s" },
212 { Opt_cache, "cache=%s" },
213
214 { Opt_ignore, "cred" },
215 { Opt_ignore, "credentials" },
216 { Opt_ignore, "cred=%s" },
217 { Opt_ignore, "credentials=%s" },
218 { Opt_ignore, "guest" },
219 { Opt_ignore, "rw" },
220 { Opt_ignore, "ro" },
221 { Opt_ignore, "suid" },
222 { Opt_ignore, "nosuid" },
223 { Opt_ignore, "exec" },
224 { Opt_ignore, "noexec" },
225 { Opt_ignore, "nodev" },
226 { Opt_ignore, "noauto" },
227 { Opt_ignore, "dev" },
228 { Opt_ignore, "mand" },
229 { Opt_ignore, "nomand" },
230 { Opt_ignore, "_netdev" },
231
232 { Opt_err, NULL }
233 };
234
235 enum {
236 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
237 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
238 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
239 Opt_sec_ntlmv2i, Opt_sec_lanman,
240 Opt_sec_none,
241
242 Opt_sec_err
243 };
244
245 static const match_table_t cifs_secflavor_tokens = {
246 { Opt_sec_krb5, "krb5" },
247 { Opt_sec_krb5i, "krb5i" },
248 { Opt_sec_krb5p, "krb5p" },
249 { Opt_sec_ntlmsspi, "ntlmsspi" },
250 { Opt_sec_ntlmssp, "ntlmssp" },
251 { Opt_ntlm, "ntlm" },
252 { Opt_sec_ntlmi, "ntlmi" },
253 { Opt_sec_ntlmv2, "nontlm" },
254 { Opt_sec_ntlmv2, "ntlmv2" },
255 { Opt_sec_ntlmv2i, "ntlmv2i" },
256 { Opt_sec_lanman, "lanman" },
257 { Opt_sec_none, "none" },
258
259 { Opt_sec_err, NULL }
260 };
261
262 /* cache flavors */
263 enum {
264 Opt_cache_loose,
265 Opt_cache_strict,
266 Opt_cache_none,
267 Opt_cache_err
268 };
269
270 static const match_table_t cifs_cacheflavor_tokens = {
271 { Opt_cache_loose, "loose" },
272 { Opt_cache_strict, "strict" },
273 { Opt_cache_none, "none" },
274 { Opt_cache_err, NULL }
275 };
276
277 static const match_table_t cifs_smb_version_tokens = {
278 { Smb_1, SMB1_VERSION_STRING },
279 { Smb_21, SMB21_VERSION_STRING },
280 };
281
282 static int ip_connect(struct TCP_Server_Info *server);
283 static int generic_ip_connect(struct TCP_Server_Info *server);
284 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
285 static void cifs_prune_tlinks(struct work_struct *work);
286 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
287 const char *devname);
288
289 /*
290 * cifs tcp session reconnection
291 *
292 * mark tcp session as reconnecting so temporarily locked
293 * mark all smb sessions as reconnecting for tcp session
294 * reconnect tcp session
295 * wake up waiters on reconnection? - (not needed currently)
296 */
297 int
298 cifs_reconnect(struct TCP_Server_Info *server)
299 {
300 int rc = 0;
301 struct list_head *tmp, *tmp2;
302 struct cifs_ses *ses;
303 struct cifs_tcon *tcon;
304 struct mid_q_entry *mid_entry;
305 struct list_head retry_list;
306
307 spin_lock(&GlobalMid_Lock);
308 if (server->tcpStatus == CifsExiting) {
309 /* the demux thread will exit normally
310 next time through the loop */
311 spin_unlock(&GlobalMid_Lock);
312 return rc;
313 } else
314 server->tcpStatus = CifsNeedReconnect;
315 spin_unlock(&GlobalMid_Lock);
316 server->maxBuf = 0;
317 #ifdef CONFIG_CIFS_SMB2
318 server->max_read = 0;
319 #endif
320
321 cFYI(1, "Reconnecting tcp session");
322
323 /* before reconnecting the tcp session, mark the smb session (uid)
324 and the tid bad so they are not used until reconnected */
325 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
326 spin_lock(&cifs_tcp_ses_lock);
327 list_for_each(tmp, &server->smb_ses_list) {
328 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
329 ses->need_reconnect = true;
330 ses->ipc_tid = 0;
331 list_for_each(tmp2, &ses->tcon_list) {
332 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
333 tcon->need_reconnect = true;
334 }
335 }
336 spin_unlock(&cifs_tcp_ses_lock);
337
338 /* do not want to be sending data on a socket we are freeing */
339 cFYI(1, "%s: tearing down socket", __func__);
340 mutex_lock(&server->srv_mutex);
341 if (server->ssocket) {
342 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
343 server->ssocket->flags);
344 kernel_sock_shutdown(server->ssocket, SHUT_WR);
345 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
346 server->ssocket->state,
347 server->ssocket->flags);
348 sock_release(server->ssocket);
349 server->ssocket = NULL;
350 }
351 server->sequence_number = 0;
352 server->session_estab = false;
353 kfree(server->session_key.response);
354 server->session_key.response = NULL;
355 server->session_key.len = 0;
356 server->lstrp = jiffies;
357 mutex_unlock(&server->srv_mutex);
358
359 /* mark submitted MIDs for retry and issue callback */
360 INIT_LIST_HEAD(&retry_list);
361 cFYI(1, "%s: moving mids to private list", __func__);
362 spin_lock(&GlobalMid_Lock);
363 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
364 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
365 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
366 mid_entry->mid_state = MID_RETRY_NEEDED;
367 list_move(&mid_entry->qhead, &retry_list);
368 }
369 spin_unlock(&GlobalMid_Lock);
370
371 cFYI(1, "%s: issuing mid callbacks", __func__);
372 list_for_each_safe(tmp, tmp2, &retry_list) {
373 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
374 list_del_init(&mid_entry->qhead);
375 mid_entry->callback(mid_entry);
376 }
377
378 do {
379 try_to_freeze();
380
381 /* we should try only the port we connected to before */
382 rc = generic_ip_connect(server);
383 if (rc) {
384 cFYI(1, "reconnect error %d", rc);
385 msleep(3000);
386 } else {
387 atomic_inc(&tcpSesReconnectCount);
388 spin_lock(&GlobalMid_Lock);
389 if (server->tcpStatus != CifsExiting)
390 server->tcpStatus = CifsNeedNegotiate;
391 spin_unlock(&GlobalMid_Lock);
392 }
393 } while (server->tcpStatus == CifsNeedReconnect);
394
395 return rc;
396 }
397
398 static void
399 cifs_echo_request(struct work_struct *work)
400 {
401 int rc;
402 struct TCP_Server_Info *server = container_of(work,
403 struct TCP_Server_Info, echo.work);
404
405 /*
406 * We cannot send an echo if it is disabled or until the
407 * NEGOTIATE_PROTOCOL request is done, which is indicated by
408 * server->ops->need_neg() == true. Also, no need to ping if
409 * we got a response recently.
410 */
411 if (!server->ops->need_neg || server->ops->need_neg(server) ||
412 (server->ops->can_echo && !server->ops->can_echo(server)) ||
413 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
414 goto requeue_echo;
415
416 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
417 if (rc)
418 cFYI(1, "Unable to send echo request to server: %s",
419 server->hostname);
420
421 requeue_echo:
422 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
423 }
424
425 static bool
426 allocate_buffers(struct TCP_Server_Info *server)
427 {
428 if (!server->bigbuf) {
429 server->bigbuf = (char *)cifs_buf_get();
430 if (!server->bigbuf) {
431 cERROR(1, "No memory for large SMB response");
432 msleep(3000);
433 /* retry will check if exiting */
434 return false;
435 }
436 } else if (server->large_buf) {
437 /* we are reusing a dirty large buf, clear its start */
438 memset(server->bigbuf, 0, HEADER_SIZE(server));
439 }
440
441 if (!server->smallbuf) {
442 server->smallbuf = (char *)cifs_small_buf_get();
443 if (!server->smallbuf) {
444 cERROR(1, "No memory for SMB response");
445 msleep(1000);
446 /* retry will check if exiting */
447 return false;
448 }
449 /* beginning of smb buffer is cleared in our buf_get */
450 } else {
451 /* if existing small buf clear beginning */
452 memset(server->smallbuf, 0, HEADER_SIZE(server));
453 }
454
455 return true;
456 }
457
458 static bool
459 server_unresponsive(struct TCP_Server_Info *server)
460 {
461 /*
462 * We need to wait 2 echo intervals to make sure we handle such
463 * situations right:
464 * 1s client sends a normal SMB request
465 * 2s client gets a response
466 * 30s echo workqueue job pops, and decides we got a response recently
467 * and don't need to send another
468 * ...
469 * 65s kernel_recvmsg times out, and we see that we haven't gotten
470 * a response in >60s.
471 */
472 if (server->tcpStatus == CifsGood &&
473 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
474 cERROR(1, "Server %s has not responded in %d seconds. "
475 "Reconnecting...", server->hostname,
476 (2 * SMB_ECHO_INTERVAL) / HZ);
477 cifs_reconnect(server);
478 wake_up(&server->response_q);
479 return true;
480 }
481
482 return false;
483 }
484
485 /*
486 * kvec_array_init - clone a kvec array, and advance into it
487 * @new: pointer to memory for cloned array
488 * @iov: pointer to original array
489 * @nr_segs: number of members in original array
490 * @bytes: number of bytes to advance into the cloned array
491 *
492 * This function will copy the array provided in iov to a section of memory
493 * and advance the specified number of bytes into the new array. It returns
494 * the number of segments in the new array. "new" must be at least as big as
495 * the original iov array.
496 */
497 static unsigned int
498 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
499 size_t bytes)
500 {
501 size_t base = 0;
502
503 while (bytes || !iov->iov_len) {
504 int copy = min(bytes, iov->iov_len);
505
506 bytes -= copy;
507 base += copy;
508 if (iov->iov_len == base) {
509 iov++;
510 nr_segs--;
511 base = 0;
512 }
513 }
514 memcpy(new, iov, sizeof(*iov) * nr_segs);
515 new->iov_base += base;
516 new->iov_len -= base;
517 return nr_segs;
518 }
519
520 static struct kvec *
521 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
522 {
523 struct kvec *new_iov;
524
525 if (server->iov && nr_segs <= server->nr_iov)
526 return server->iov;
527
528 /* not big enough -- allocate a new one and release the old */
529 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
530 if (new_iov) {
531 kfree(server->iov);
532 server->iov = new_iov;
533 server->nr_iov = nr_segs;
534 }
535 return new_iov;
536 }
537
538 int
539 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
540 unsigned int nr_segs, unsigned int to_read)
541 {
542 int length = 0;
543 int total_read;
544 unsigned int segs;
545 struct msghdr smb_msg;
546 struct kvec *iov;
547
548 iov = get_server_iovec(server, nr_segs);
549 if (!iov)
550 return -ENOMEM;
551
552 smb_msg.msg_control = NULL;
553 smb_msg.msg_controllen = 0;
554
555 for (total_read = 0; to_read; total_read += length, to_read -= length) {
556 try_to_freeze();
557
558 if (server_unresponsive(server)) {
559 total_read = -EAGAIN;
560 break;
561 }
562
563 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
564
565 length = kernel_recvmsg(server->ssocket, &smb_msg,
566 iov, segs, to_read, 0);
567
568 if (server->tcpStatus == CifsExiting) {
569 total_read = -ESHUTDOWN;
570 break;
571 } else if (server->tcpStatus == CifsNeedReconnect) {
572 cifs_reconnect(server);
573 total_read = -EAGAIN;
574 break;
575 } else if (length == -ERESTARTSYS ||
576 length == -EAGAIN ||
577 length == -EINTR) {
578 /*
579 * Minimum sleep to prevent looping, allowing socket
580 * to clear and app threads to set tcpStatus
581 * CifsNeedReconnect if server hung.
582 */
583 usleep_range(1000, 2000);
584 length = 0;
585 continue;
586 } else if (length <= 0) {
587 cFYI(1, "Received no data or error: expecting %d "
588 "got %d", to_read, length);
589 cifs_reconnect(server);
590 total_read = -EAGAIN;
591 break;
592 }
593 }
594 return total_read;
595 }
596
597 int
598 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
599 unsigned int to_read)
600 {
601 struct kvec iov;
602
603 iov.iov_base = buf;
604 iov.iov_len = to_read;
605
606 return cifs_readv_from_socket(server, &iov, 1, to_read);
607 }
608
609 static bool
610 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
611 {
612 /*
613 * The first byte big endian of the length field,
614 * is actually not part of the length but the type
615 * with the most common, zero, as regular data.
616 */
617 switch (type) {
618 case RFC1002_SESSION_MESSAGE:
619 /* Regular SMB response */
620 return true;
621 case RFC1002_SESSION_KEEP_ALIVE:
622 cFYI(1, "RFC 1002 session keep alive");
623 break;
624 case RFC1002_POSITIVE_SESSION_RESPONSE:
625 cFYI(1, "RFC 1002 positive session response");
626 break;
627 case RFC1002_NEGATIVE_SESSION_RESPONSE:
628 /*
629 * We get this from Windows 98 instead of an error on
630 * SMB negprot response.
631 */
632 cFYI(1, "RFC 1002 negative session response");
633 /* give server a second to clean up */
634 msleep(1000);
635 /*
636 * Always try 445 first on reconnect since we get NACK
637 * on some if we ever connected to port 139 (the NACK
638 * is since we do not begin with RFC1001 session
639 * initialize frame).
640 */
641 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
642 cifs_reconnect(server);
643 wake_up(&server->response_q);
644 break;
645 default:
646 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
647 cifs_reconnect(server);
648 }
649
650 return false;
651 }
652
653 void
654 dequeue_mid(struct mid_q_entry *mid, bool malformed)
655 {
656 #ifdef CONFIG_CIFS_STATS2
657 mid->when_received = jiffies;
658 #endif
659 spin_lock(&GlobalMid_Lock);
660 if (!malformed)
661 mid->mid_state = MID_RESPONSE_RECEIVED;
662 else
663 mid->mid_state = MID_RESPONSE_MALFORMED;
664 list_del_init(&mid->qhead);
665 spin_unlock(&GlobalMid_Lock);
666 }
667
668 static void
669 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
670 char *buf, int malformed)
671 {
672 if (server->ops->check_trans2 &&
673 server->ops->check_trans2(mid, server, buf, malformed))
674 return;
675 mid->resp_buf = buf;
676 mid->large_buf = server->large_buf;
677 /* Was previous buf put in mpx struct for multi-rsp? */
678 if (!mid->multiRsp) {
679 /* smb buffer will be freed by user thread */
680 if (server->large_buf)
681 server->bigbuf = NULL;
682 else
683 server->smallbuf = NULL;
684 }
685 dequeue_mid(mid, malformed);
686 }
687
688 static void clean_demultiplex_info(struct TCP_Server_Info *server)
689 {
690 int length;
691
692 /* take it off the list, if it's not already */
693 spin_lock(&cifs_tcp_ses_lock);
694 list_del_init(&server->tcp_ses_list);
695 spin_unlock(&cifs_tcp_ses_lock);
696
697 spin_lock(&GlobalMid_Lock);
698 server->tcpStatus = CifsExiting;
699 spin_unlock(&GlobalMid_Lock);
700 wake_up_all(&server->response_q);
701
702 /* check if we have blocked requests that need to free */
703 spin_lock(&server->req_lock);
704 if (server->credits <= 0)
705 server->credits = 1;
706 spin_unlock(&server->req_lock);
707 /*
708 * Although there should not be any requests blocked on this queue it
709 * can not hurt to be paranoid and try to wake up requests that may
710 * haven been blocked when more than 50 at time were on the wire to the
711 * same server - they now will see the session is in exit state and get
712 * out of SendReceive.
713 */
714 wake_up_all(&server->request_q);
715 /* give those requests time to exit */
716 msleep(125);
717
718 if (server->ssocket) {
719 sock_release(server->ssocket);
720 server->ssocket = NULL;
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 struct list_head dispose_list;
725 struct mid_q_entry *mid_entry;
726 struct list_head *tmp, *tmp2;
727
728 INIT_LIST_HEAD(&dispose_list);
729 spin_lock(&GlobalMid_Lock);
730 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
731 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
732 cFYI(1, "Clearing mid 0x%llx", mid_entry->mid);
733 mid_entry->mid_state = MID_SHUTDOWN;
734 list_move(&mid_entry->qhead, &dispose_list);
735 }
736 spin_unlock(&GlobalMid_Lock);
737
738 /* now walk dispose list and issue callbacks */
739 list_for_each_safe(tmp, tmp2, &dispose_list) {
740 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
741 cFYI(1, "Callback mid 0x%llx", mid_entry->mid);
742 list_del_init(&mid_entry->qhead);
743 mid_entry->callback(mid_entry);
744 }
745 /* 1/8th of sec is more than enough time for them to exit */
746 msleep(125);
747 }
748
749 if (!list_empty(&server->pending_mid_q)) {
750 /*
751 * mpx threads have not exited yet give them at least the smb
752 * send timeout time for long ops.
753 *
754 * Due to delays on oplock break requests, we need to wait at
755 * least 45 seconds before giving up on a request getting a
756 * response and going ahead and killing cifsd.
757 */
758 cFYI(1, "Wait for exit from demultiplex thread");
759 msleep(46000);
760 /*
761 * If threads still have not exited they are probably never
762 * coming home not much else we can do but free the memory.
763 */
764 }
765
766 kfree(server->hostname);
767 kfree(server->iov);
768 kfree(server);
769
770 length = atomic_dec_return(&tcpSesAllocCount);
771 if (length > 0)
772 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
773 GFP_KERNEL);
774 }
775
776 static int
777 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
778 {
779 int length;
780 char *buf = server->smallbuf;
781 unsigned int pdu_length = get_rfc1002_length(buf);
782
783 /* make sure this will fit in a large buffer */
784 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
785 cERROR(1, "SMB response too long (%u bytes)",
786 pdu_length);
787 cifs_reconnect(server);
788 wake_up(&server->response_q);
789 return -EAGAIN;
790 }
791
792 /* switch to large buffer if too big for a small one */
793 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
794 server->large_buf = true;
795 memcpy(server->bigbuf, buf, server->total_read);
796 buf = server->bigbuf;
797 }
798
799 /* now read the rest */
800 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
801 pdu_length - HEADER_SIZE(server) + 1 + 4);
802 if (length < 0)
803 return length;
804 server->total_read += length;
805
806 dump_smb(buf, server->total_read);
807
808 /*
809 * We know that we received enough to get to the MID as we
810 * checked the pdu_length earlier. Now check to see
811 * if the rest of the header is OK. We borrow the length
812 * var for the rest of the loop to avoid a new stack var.
813 *
814 * 48 bytes is enough to display the header and a little bit
815 * into the payload for debugging purposes.
816 */
817 length = server->ops->check_message(buf, server->total_read);
818 if (length != 0)
819 cifs_dump_mem("Bad SMB: ", buf,
820 min_t(unsigned int, server->total_read, 48));
821
822 if (server->ops->is_status_pending &&
823 server->ops->is_status_pending(buf, server, length))
824 return -1;
825
826 if (!mid)
827 return length;
828
829 handle_mid(mid, server, buf, length);
830 return 0;
831 }
832
833 static int
834 cifs_demultiplex_thread(void *p)
835 {
836 int length;
837 struct TCP_Server_Info *server = p;
838 unsigned int pdu_length;
839 char *buf = NULL;
840 struct task_struct *task_to_wake = NULL;
841 struct mid_q_entry *mid_entry;
842
843 current->flags |= PF_MEMALLOC;
844 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
845
846 length = atomic_inc_return(&tcpSesAllocCount);
847 if (length > 1)
848 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
849 GFP_KERNEL);
850
851 set_freezable();
852 while (server->tcpStatus != CifsExiting) {
853 if (try_to_freeze())
854 continue;
855
856 if (!allocate_buffers(server))
857 continue;
858
859 server->large_buf = false;
860 buf = server->smallbuf;
861 pdu_length = 4; /* enough to get RFC1001 header */
862
863 length = cifs_read_from_socket(server, buf, pdu_length);
864 if (length < 0)
865 continue;
866 server->total_read = length;
867
868 /*
869 * The right amount was read from socket - 4 bytes,
870 * so we can now interpret the length field.
871 */
872 pdu_length = get_rfc1002_length(buf);
873
874 cFYI(1, "RFC1002 header 0x%x", pdu_length);
875 if (!is_smb_response(server, buf[0]))
876 continue;
877
878 /* make sure we have enough to get to the MID */
879 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
880 cERROR(1, "SMB response too short (%u bytes)",
881 pdu_length);
882 cifs_reconnect(server);
883 wake_up(&server->response_q);
884 continue;
885 }
886
887 /* read down to the MID */
888 length = cifs_read_from_socket(server, buf + 4,
889 HEADER_SIZE(server) - 1 - 4);
890 if (length < 0)
891 continue;
892 server->total_read += length;
893
894 mid_entry = server->ops->find_mid(server, buf);
895
896 if (!mid_entry || !mid_entry->receive)
897 length = standard_receive3(server, mid_entry);
898 else
899 length = mid_entry->receive(server, mid_entry);
900
901 if (length < 0)
902 continue;
903
904 if (server->large_buf)
905 buf = server->bigbuf;
906
907 server->lstrp = jiffies;
908 if (mid_entry != NULL) {
909 if (!mid_entry->multiRsp || mid_entry->multiEnd)
910 mid_entry->callback(mid_entry);
911 } else if (!server->ops->is_oplock_break ||
912 !server->ops->is_oplock_break(buf, server)) {
913 cERROR(1, "No task to wake, unknown frame received! "
914 "NumMids %d", atomic_read(&midCount));
915 cifs_dump_mem("Received Data is: ", buf,
916 HEADER_SIZE(server));
917 #ifdef CONFIG_CIFS_DEBUG2
918 if (server->ops->dump_detail)
919 server->ops->dump_detail(buf);
920 cifs_dump_mids(server);
921 #endif /* CIFS_DEBUG2 */
922
923 }
924 } /* end while !EXITING */
925
926 /* buffer usually freed in free_mid - need to free it here on exit */
927 cifs_buf_release(server->bigbuf);
928 if (server->smallbuf) /* no sense logging a debug message if NULL */
929 cifs_small_buf_release(server->smallbuf);
930
931 task_to_wake = xchg(&server->tsk, NULL);
932 clean_demultiplex_info(server);
933
934 /* if server->tsk was NULL then wait for a signal before exiting */
935 if (!task_to_wake) {
936 set_current_state(TASK_INTERRUPTIBLE);
937 while (!signal_pending(current)) {
938 schedule();
939 set_current_state(TASK_INTERRUPTIBLE);
940 }
941 set_current_state(TASK_RUNNING);
942 }
943
944 module_put_and_exit(0);
945 }
946
947 /* extract the host portion of the UNC string */
948 static char *
949 extract_hostname(const char *unc)
950 {
951 const char *src;
952 char *dst, *delim;
953 unsigned int len;
954
955 /* skip double chars at beginning of string */
956 /* BB: check validity of these bytes? */
957 src = unc + 2;
958
959 /* delimiter between hostname and sharename is always '\\' now */
960 delim = strchr(src, '\\');
961 if (!delim)
962 return ERR_PTR(-EINVAL);
963
964 len = delim - src;
965 dst = kmalloc((len + 1), GFP_KERNEL);
966 if (dst == NULL)
967 return ERR_PTR(-ENOMEM);
968
969 memcpy(dst, src, len);
970 dst[len] = '\0';
971
972 return dst;
973 }
974
975 static int get_option_ul(substring_t args[], unsigned long *option)
976 {
977 int rc;
978 char *string;
979
980 string = match_strdup(args);
981 if (string == NULL)
982 return -ENOMEM;
983 rc = kstrtoul(string, 0, option);
984 kfree(string);
985
986 return rc;
987 }
988
989
990 static int cifs_parse_security_flavors(char *value,
991 struct smb_vol *vol)
992 {
993
994 substring_t args[MAX_OPT_ARGS];
995
996 switch (match_token(value, cifs_secflavor_tokens, args)) {
997 case Opt_sec_krb5:
998 vol->secFlg |= CIFSSEC_MAY_KRB5;
999 break;
1000 case Opt_sec_krb5i:
1001 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1002 break;
1003 case Opt_sec_krb5p:
1004 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1005 cERROR(1, "Krb5 cifs privacy not supported");
1006 break;
1007 case Opt_sec_ntlmssp:
1008 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1009 break;
1010 case Opt_sec_ntlmsspi:
1011 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1012 break;
1013 case Opt_ntlm:
1014 /* ntlm is default so can be turned off too */
1015 vol->secFlg |= CIFSSEC_MAY_NTLM;
1016 break;
1017 case Opt_sec_ntlmi:
1018 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1019 break;
1020 case Opt_sec_ntlmv2:
1021 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1022 break;
1023 case Opt_sec_ntlmv2i:
1024 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1025 break;
1026 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1027 case Opt_sec_lanman:
1028 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1029 break;
1030 #endif
1031 case Opt_sec_none:
1032 vol->nullauth = 1;
1033 break;
1034 default:
1035 cERROR(1, "bad security option: %s", value);
1036 return 1;
1037 }
1038
1039 return 0;
1040 }
1041
1042 static int
1043 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1044 {
1045 substring_t args[MAX_OPT_ARGS];
1046
1047 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1048 case Opt_cache_loose:
1049 vol->direct_io = false;
1050 vol->strict_io = false;
1051 break;
1052 case Opt_cache_strict:
1053 vol->direct_io = false;
1054 vol->strict_io = true;
1055 break;
1056 case Opt_cache_none:
1057 vol->direct_io = true;
1058 vol->strict_io = false;
1059 break;
1060 default:
1061 cERROR(1, "bad cache= option: %s", value);
1062 return 1;
1063 }
1064 return 0;
1065 }
1066
1067 static int
1068 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1069 {
1070 substring_t args[MAX_OPT_ARGS];
1071
1072 switch (match_token(value, cifs_smb_version_tokens, args)) {
1073 case Smb_1:
1074 vol->ops = &smb1_operations;
1075 vol->vals = &smb1_values;
1076 break;
1077 #ifdef CONFIG_CIFS_SMB2
1078 case Smb_21:
1079 vol->ops = &smb21_operations;
1080 vol->vals = &smb21_values;
1081 break;
1082 #endif
1083 default:
1084 cERROR(1, "Unknown vers= option specified: %s", value);
1085 return 1;
1086 }
1087 return 0;
1088 }
1089
1090 static int
1091 cifs_parse_mount_options(const char *mountdata, const char *devname,
1092 struct smb_vol *vol)
1093 {
1094 char *data, *end;
1095 char *mountdata_copy = NULL, *options;
1096 unsigned int temp_len, i, j;
1097 char separator[2];
1098 short int override_uid = -1;
1099 short int override_gid = -1;
1100 bool uid_specified = false;
1101 bool gid_specified = false;
1102 bool sloppy = false;
1103 char *invalid = NULL;
1104 char *nodename = utsname()->nodename;
1105 char *string = NULL;
1106 char *tmp_end, *value;
1107 char delim;
1108 bool cache_specified = false;
1109 static bool cache_warned = false;
1110
1111 separator[0] = ',';
1112 separator[1] = 0;
1113 delim = separator[0];
1114
1115 /*
1116 * does not have to be perfect mapping since field is
1117 * informational, only used for servers that do not support
1118 * port 445 and it can be overridden at mount time
1119 */
1120 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1121 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1122 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1123
1124 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1125 /* null target name indicates to use *SMBSERVR default called name
1126 if we end up sending RFC1001 session initialize */
1127 vol->target_rfc1001_name[0] = 0;
1128 vol->cred_uid = current_uid();
1129 vol->linux_uid = current_uid();
1130 vol->linux_gid = current_gid();
1131
1132 /* default to only allowing write access to owner of the mount */
1133 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1134
1135 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1136 /* default is always to request posix paths. */
1137 vol->posix_paths = 1;
1138 /* default to using server inode numbers where available */
1139 vol->server_ino = 1;
1140
1141 vol->actimeo = CIFS_DEF_ACTIMEO;
1142
1143 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1144 vol->ops = &smb1_operations;
1145 vol->vals = &smb1_values;
1146
1147 if (!mountdata)
1148 goto cifs_parse_mount_err;
1149
1150 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1151 if (!mountdata_copy)
1152 goto cifs_parse_mount_err;
1153
1154 options = mountdata_copy;
1155 end = options + strlen(options);
1156
1157 if (strncmp(options, "sep=", 4) == 0) {
1158 if (options[4] != 0) {
1159 separator[0] = options[4];
1160 options += 5;
1161 } else {
1162 cFYI(1, "Null separator not allowed");
1163 }
1164 }
1165 vol->backupuid_specified = false; /* no backup intent for a user */
1166 vol->backupgid_specified = false; /* no backup intent for a group */
1167
1168 while ((data = strsep(&options, separator)) != NULL) {
1169 substring_t args[MAX_OPT_ARGS];
1170 unsigned long option;
1171 int token;
1172
1173 if (!*data)
1174 continue;
1175
1176 token = match_token(data, cifs_mount_option_tokens, args);
1177
1178 switch (token) {
1179
1180 /* Ingnore the following */
1181 case Opt_ignore:
1182 break;
1183
1184 /* Boolean values */
1185 case Opt_user_xattr:
1186 vol->no_xattr = 0;
1187 break;
1188 case Opt_nouser_xattr:
1189 vol->no_xattr = 1;
1190 break;
1191 case Opt_forceuid:
1192 override_uid = 1;
1193 break;
1194 case Opt_noforceuid:
1195 override_uid = 0;
1196 break;
1197 case Opt_noblocksend:
1198 vol->noblocksnd = 1;
1199 break;
1200 case Opt_noautotune:
1201 vol->noautotune = 1;
1202 break;
1203 case Opt_hard:
1204 vol->retry = 1;
1205 break;
1206 case Opt_soft:
1207 vol->retry = 0;
1208 break;
1209 case Opt_perm:
1210 vol->noperm = 0;
1211 break;
1212 case Opt_noperm:
1213 vol->noperm = 1;
1214 break;
1215 case Opt_mapchars:
1216 vol->remap = 1;
1217 break;
1218 case Opt_nomapchars:
1219 vol->remap = 0;
1220 break;
1221 case Opt_sfu:
1222 vol->sfu_emul = 1;
1223 break;
1224 case Opt_nosfu:
1225 vol->sfu_emul = 0;
1226 break;
1227 case Opt_nodfs:
1228 vol->nodfs = 1;
1229 break;
1230 case Opt_posixpaths:
1231 vol->posix_paths = 1;
1232 break;
1233 case Opt_noposixpaths:
1234 vol->posix_paths = 0;
1235 break;
1236 case Opt_nounix:
1237 vol->no_linux_ext = 1;
1238 break;
1239 case Opt_nocase:
1240 vol->nocase = 1;
1241 break;
1242 case Opt_brl:
1243 vol->nobrl = 0;
1244 break;
1245 case Opt_nobrl:
1246 vol->nobrl = 1;
1247 /*
1248 * turn off mandatory locking in mode
1249 * if remote locking is turned off since the
1250 * local vfs will do advisory
1251 */
1252 if (vol->file_mode ==
1253 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1254 vol->file_mode = S_IALLUGO;
1255 break;
1256 case Opt_forcemandatorylock:
1257 vol->mand_lock = 1;
1258 break;
1259 case Opt_setuids:
1260 vol->setuids = 1;
1261 break;
1262 case Opt_nosetuids:
1263 vol->setuids = 0;
1264 break;
1265 case Opt_dynperm:
1266 vol->dynperm = true;
1267 break;
1268 case Opt_nodynperm:
1269 vol->dynperm = false;
1270 break;
1271 case Opt_nohard:
1272 vol->retry = 0;
1273 break;
1274 case Opt_nosoft:
1275 vol->retry = 1;
1276 break;
1277 case Opt_nointr:
1278 vol->intr = 0;
1279 break;
1280 case Opt_intr:
1281 vol->intr = 1;
1282 break;
1283 case Opt_nostrictsync:
1284 vol->nostrictsync = 1;
1285 break;
1286 case Opt_strictsync:
1287 vol->nostrictsync = 0;
1288 break;
1289 case Opt_serverino:
1290 vol->server_ino = 1;
1291 break;
1292 case Opt_noserverino:
1293 vol->server_ino = 0;
1294 break;
1295 case Opt_rwpidforward:
1296 vol->rwpidforward = 1;
1297 break;
1298 case Opt_cifsacl:
1299 vol->cifs_acl = 1;
1300 break;
1301 case Opt_nocifsacl:
1302 vol->cifs_acl = 0;
1303 break;
1304 case Opt_acl:
1305 vol->no_psx_acl = 0;
1306 break;
1307 case Opt_noacl:
1308 vol->no_psx_acl = 1;
1309 break;
1310 case Opt_locallease:
1311 vol->local_lease = 1;
1312 break;
1313 case Opt_sign:
1314 vol->secFlg |= CIFSSEC_MUST_SIGN;
1315 break;
1316 case Opt_seal:
1317 /* we do not do the following in secFlags because seal
1318 * is a per tree connection (mount) not a per socket
1319 * or per-smb connection option in the protocol
1320 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1321 */
1322 vol->seal = 1;
1323 break;
1324 case Opt_direct:
1325 cache_specified = true;
1326 vol->direct_io = true;
1327 vol->strict_io = false;
1328 cERROR(1, "The \"directio\" option will be removed in "
1329 "3.7. Please switch to the \"cache=none\" "
1330 "option.");
1331 break;
1332 case Opt_strictcache:
1333 cache_specified = true;
1334 vol->direct_io = false;
1335 vol->strict_io = true;
1336 cERROR(1, "The \"strictcache\" option will be removed "
1337 "in 3.7. Please switch to the \"cache=strict\" "
1338 "option.");
1339 break;
1340 case Opt_noac:
1341 printk(KERN_WARNING "CIFS: Mount option noac not "
1342 "supported. Instead set "
1343 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1344 break;
1345 case Opt_fsc:
1346 #ifndef CONFIG_CIFS_FSCACHE
1347 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1348 "kernel config option set");
1349 goto cifs_parse_mount_err;
1350 #endif
1351 vol->fsc = true;
1352 break;
1353 case Opt_mfsymlinks:
1354 vol->mfsymlinks = true;
1355 break;
1356 case Opt_multiuser:
1357 vol->multiuser = true;
1358 break;
1359 case Opt_sloppy:
1360 sloppy = true;
1361 break;
1362
1363 /* Numeric Values */
1364 case Opt_backupuid:
1365 if (get_option_ul(args, &option)) {
1366 cERROR(1, "%s: Invalid backupuid value",
1367 __func__);
1368 goto cifs_parse_mount_err;
1369 }
1370 vol->backupuid = option;
1371 vol->backupuid_specified = true;
1372 break;
1373 case Opt_backupgid:
1374 if (get_option_ul(args, &option)) {
1375 cERROR(1, "%s: Invalid backupgid value",
1376 __func__);
1377 goto cifs_parse_mount_err;
1378 }
1379 vol->backupgid = option;
1380 vol->backupgid_specified = true;
1381 break;
1382 case Opt_uid:
1383 if (get_option_ul(args, &option)) {
1384 cERROR(1, "%s: Invalid uid value",
1385 __func__);
1386 goto cifs_parse_mount_err;
1387 }
1388 vol->linux_uid = option;
1389 uid_specified = true;
1390 break;
1391 case Opt_cruid:
1392 if (get_option_ul(args, &option)) {
1393 cERROR(1, "%s: Invalid cruid value",
1394 __func__);
1395 goto cifs_parse_mount_err;
1396 }
1397 vol->cred_uid = option;
1398 break;
1399 case Opt_gid:
1400 if (get_option_ul(args, &option)) {
1401 cERROR(1, "%s: Invalid gid value",
1402 __func__);
1403 goto cifs_parse_mount_err;
1404 }
1405 vol->linux_gid = option;
1406 gid_specified = true;
1407 break;
1408 case Opt_file_mode:
1409 if (get_option_ul(args, &option)) {
1410 cERROR(1, "%s: Invalid file_mode value",
1411 __func__);
1412 goto cifs_parse_mount_err;
1413 }
1414 vol->file_mode = option;
1415 break;
1416 case Opt_dirmode:
1417 if (get_option_ul(args, &option)) {
1418 cERROR(1, "%s: Invalid dir_mode value",
1419 __func__);
1420 goto cifs_parse_mount_err;
1421 }
1422 vol->dir_mode = option;
1423 break;
1424 case Opt_port:
1425 if (get_option_ul(args, &option)) {
1426 cERROR(1, "%s: Invalid port value",
1427 __func__);
1428 goto cifs_parse_mount_err;
1429 }
1430 vol->port = option;
1431 break;
1432 case Opt_rsize:
1433 if (get_option_ul(args, &option)) {
1434 cERROR(1, "%s: Invalid rsize value",
1435 __func__);
1436 goto cifs_parse_mount_err;
1437 }
1438 vol->rsize = option;
1439 break;
1440 case Opt_wsize:
1441 if (get_option_ul(args, &option)) {
1442 cERROR(1, "%s: Invalid wsize value",
1443 __func__);
1444 goto cifs_parse_mount_err;
1445 }
1446 vol->wsize = option;
1447 break;
1448 case Opt_actimeo:
1449 if (get_option_ul(args, &option)) {
1450 cERROR(1, "%s: Invalid actimeo value",
1451 __func__);
1452 goto cifs_parse_mount_err;
1453 }
1454 vol->actimeo = HZ * option;
1455 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1456 cERROR(1, "CIFS: attribute cache"
1457 "timeout too large");
1458 goto cifs_parse_mount_err;
1459 }
1460 break;
1461
1462 /* String Arguments */
1463
1464 case Opt_blank_user:
1465 /* null user, ie. anonymous authentication */
1466 vol->nullauth = 1;
1467 vol->username = NULL;
1468 break;
1469 case Opt_user:
1470 string = match_strdup(args);
1471 if (string == NULL)
1472 goto out_nomem;
1473
1474 if (strnlen(string, MAX_USERNAME_SIZE) >
1475 MAX_USERNAME_SIZE) {
1476 printk(KERN_WARNING "CIFS: username too long\n");
1477 goto cifs_parse_mount_err;
1478 }
1479 vol->username = kstrdup(string, GFP_KERNEL);
1480 if (!vol->username) {
1481 printk(KERN_WARNING "CIFS: no memory "
1482 "for username\n");
1483 goto cifs_parse_mount_err;
1484 }
1485 break;
1486 case Opt_blank_pass:
1487 vol->password = NULL;
1488 break;
1489 case Opt_pass:
1490 /* passwords have to be handled differently
1491 * to allow the character used for deliminator
1492 * to be passed within them
1493 */
1494
1495 /* Obtain the value string */
1496 value = strchr(data, '=');
1497 value++;
1498
1499 /* Set tmp_end to end of the string */
1500 tmp_end = (char *) value + strlen(value);
1501
1502 /* Check if following character is the deliminator
1503 * If yes, we have encountered a double deliminator
1504 * reset the NULL character to the deliminator
1505 */
1506 if (tmp_end < end && tmp_end[1] == delim) {
1507 tmp_end[0] = delim;
1508
1509 /* Keep iterating until we get to a single
1510 * deliminator OR the end
1511 */
1512 while ((tmp_end = strchr(tmp_end, delim))
1513 != NULL && (tmp_end[1] == delim)) {
1514 tmp_end = (char *) &tmp_end[2];
1515 }
1516
1517 /* Reset var options to point to next element */
1518 if (tmp_end) {
1519 tmp_end[0] = '\0';
1520 options = (char *) &tmp_end[1];
1521 } else
1522 /* Reached the end of the mount option
1523 * string */
1524 options = end;
1525 }
1526
1527 /* Now build new password string */
1528 temp_len = strlen(value);
1529 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1530 if (vol->password == NULL) {
1531 printk(KERN_WARNING "CIFS: no memory "
1532 "for password\n");
1533 goto cifs_parse_mount_err;
1534 }
1535
1536 for (i = 0, j = 0; i < temp_len; i++, j++) {
1537 vol->password[j] = value[i];
1538 if ((value[i] == delim) &&
1539 value[i+1] == delim)
1540 /* skip the second deliminator */
1541 i++;
1542 }
1543 vol->password[j] = '\0';
1544 break;
1545 case Opt_blank_ip:
1546 vol->UNCip = NULL;
1547 break;
1548 case Opt_ip:
1549 string = match_strdup(args);
1550 if (string == NULL)
1551 goto out_nomem;
1552
1553 if (strnlen(string, INET6_ADDRSTRLEN) >
1554 INET6_ADDRSTRLEN) {
1555 printk(KERN_WARNING "CIFS: ip address "
1556 "too long\n");
1557 goto cifs_parse_mount_err;
1558 }
1559 vol->UNCip = kstrdup(string, GFP_KERNEL);
1560 if (!vol->UNCip) {
1561 printk(KERN_WARNING "CIFS: no memory "
1562 "for UNC IP\n");
1563 goto cifs_parse_mount_err;
1564 }
1565 break;
1566 case Opt_unc:
1567 string = match_strdup(args);
1568 if (string == NULL)
1569 goto out_nomem;
1570
1571 temp_len = strnlen(string, 300);
1572 if (temp_len == 300) {
1573 printk(KERN_WARNING "CIFS: UNC name too long\n");
1574 goto cifs_parse_mount_err;
1575 }
1576
1577 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1578 if (vol->UNC == NULL) {
1579 printk(KERN_WARNING "CIFS: no memory for UNC\n");
1580 goto cifs_parse_mount_err;
1581 }
1582 strcpy(vol->UNC, string);
1583
1584 if (strncmp(string, "//", 2) == 0) {
1585 vol->UNC[0] = '\\';
1586 vol->UNC[1] = '\\';
1587 } else if (strncmp(string, "\\\\", 2) != 0) {
1588 printk(KERN_WARNING "CIFS: UNC Path does not "
1589 "begin with // or \\\\\n");
1590 goto cifs_parse_mount_err;
1591 }
1592
1593 break;
1594 case Opt_domain:
1595 string = match_strdup(args);
1596 if (string == NULL)
1597 goto out_nomem;
1598
1599 if (strnlen(string, 256) == 256) {
1600 printk(KERN_WARNING "CIFS: domain name too"
1601 " long\n");
1602 goto cifs_parse_mount_err;
1603 }
1604
1605 vol->domainname = kstrdup(string, GFP_KERNEL);
1606 if (!vol->domainname) {
1607 printk(KERN_WARNING "CIFS: no memory "
1608 "for domainname\n");
1609 goto cifs_parse_mount_err;
1610 }
1611 cFYI(1, "Domain name set");
1612 break;
1613 case Opt_srcaddr:
1614 string = match_strdup(args);
1615 if (string == NULL)
1616 goto out_nomem;
1617
1618 if (!cifs_convert_address(
1619 (struct sockaddr *)&vol->srcaddr,
1620 string, strlen(string))) {
1621 printk(KERN_WARNING "CIFS: Could not parse"
1622 " srcaddr: %s\n", string);
1623 goto cifs_parse_mount_err;
1624 }
1625 break;
1626 case Opt_prefixpath:
1627 string = match_strdup(args);
1628 if (string == NULL)
1629 goto out_nomem;
1630
1631 temp_len = strnlen(string, 1024);
1632 if (string[0] != '/')
1633 temp_len++; /* missing leading slash */
1634 if (temp_len > 1024) {
1635 printk(KERN_WARNING "CIFS: prefix too long\n");
1636 goto cifs_parse_mount_err;
1637 }
1638
1639 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1640 if (vol->prepath == NULL) {
1641 printk(KERN_WARNING "CIFS: no memory "
1642 "for path prefix\n");
1643 goto cifs_parse_mount_err;
1644 }
1645
1646 if (string[0] != '/') {
1647 vol->prepath[0] = '/';
1648 strcpy(vol->prepath+1, string);
1649 } else
1650 strcpy(vol->prepath, string);
1651
1652 break;
1653 case Opt_iocharset:
1654 string = match_strdup(args);
1655 if (string == NULL)
1656 goto out_nomem;
1657
1658 if (strnlen(string, 1024) >= 65) {
1659 printk(KERN_WARNING "CIFS: iocharset name "
1660 "too long.\n");
1661 goto cifs_parse_mount_err;
1662 }
1663
1664 if (strnicmp(string, "default", 7) != 0) {
1665 vol->iocharset = kstrdup(string,
1666 GFP_KERNEL);
1667 if (!vol->iocharset) {
1668 printk(KERN_WARNING "CIFS: no memory"
1669 "for charset\n");
1670 goto cifs_parse_mount_err;
1671 }
1672 }
1673 /* if iocharset not set then load_nls_default
1674 * is used by caller
1675 */
1676 cFYI(1, "iocharset set to %s", string);
1677 break;
1678 case Opt_sockopt:
1679 string = match_strdup(args);
1680 if (string == NULL)
1681 goto out_nomem;
1682
1683 if (strnicmp(string, "TCP_NODELAY", 11) == 0) {
1684 printk(KERN_WARNING "CIFS: the "
1685 "sockopt=TCP_NODELAY option has been "
1686 "deprecated and will be removed "
1687 "in 3.9\n");
1688 vol->sockopt_tcp_nodelay = 1;
1689 }
1690 break;
1691 case Opt_netbiosname:
1692 string = match_strdup(args);
1693 if (string == NULL)
1694 goto out_nomem;
1695
1696 memset(vol->source_rfc1001_name, 0x20,
1697 RFC1001_NAME_LEN);
1698 /*
1699 * FIXME: are there cases in which a comma can
1700 * be valid in workstation netbios name (and
1701 * need special handling)?
1702 */
1703 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1704 /* don't ucase netbiosname for user */
1705 if (string[i] == 0)
1706 break;
1707 vol->source_rfc1001_name[i] = string[i];
1708 }
1709 /* The string has 16th byte zero still from
1710 * set at top of the function
1711 */
1712 if (i == RFC1001_NAME_LEN && string[i] != 0)
1713 printk(KERN_WARNING "CIFS: netbiosname"
1714 " longer than 15 truncated.\n");
1715
1716 break;
1717 case Opt_servern:
1718 /* servernetbiosname specified override *SMBSERVER */
1719 string = match_strdup(args);
1720 if (string == NULL)
1721 goto out_nomem;
1722
1723 /* last byte, type, is 0x20 for servr type */
1724 memset(vol->target_rfc1001_name, 0x20,
1725 RFC1001_NAME_LEN_WITH_NULL);
1726
1727 /* BB are there cases in which a comma can be
1728 valid in this workstation netbios name
1729 (and need special handling)? */
1730
1731 /* user or mount helper must uppercase the
1732 netbios name */
1733 for (i = 0; i < 15; i++) {
1734 if (string[i] == 0)
1735 break;
1736 vol->target_rfc1001_name[i] = string[i];
1737 }
1738 /* The string has 16th byte zero still from
1739 set at top of the function */
1740 if (i == RFC1001_NAME_LEN && string[i] != 0)
1741 printk(KERN_WARNING "CIFS: server net"
1742 "biosname longer than 15 truncated.\n");
1743 break;
1744 case Opt_ver:
1745 string = match_strdup(args);
1746 if (string == NULL)
1747 goto out_nomem;
1748
1749 if (strnicmp(string, "1", 1) == 0) {
1750 /* This is the default */
1751 break;
1752 }
1753 /* For all other value, error */
1754 printk(KERN_WARNING "CIFS: Invalid version"
1755 " specified\n");
1756 goto cifs_parse_mount_err;
1757 case Opt_vers:
1758 string = match_strdup(args);
1759 if (string == NULL)
1760 goto out_nomem;
1761
1762 if (cifs_parse_smb_version(string, vol) != 0)
1763 goto cifs_parse_mount_err;
1764 break;
1765 case Opt_sec:
1766 string = match_strdup(args);
1767 if (string == NULL)
1768 goto out_nomem;
1769
1770 if (cifs_parse_security_flavors(string, vol) != 0)
1771 goto cifs_parse_mount_err;
1772 break;
1773 case Opt_cache:
1774 cache_specified = true;
1775 string = match_strdup(args);
1776 if (string == NULL)
1777 goto out_nomem;
1778
1779 if (cifs_parse_cache_flavor(string, vol) != 0)
1780 goto cifs_parse_mount_err;
1781 break;
1782 default:
1783 /*
1784 * An option we don't recognize. Save it off for later
1785 * if we haven't already found one
1786 */
1787 if (!invalid)
1788 invalid = data;
1789 break;
1790 }
1791 /* Free up any allocated string */
1792 kfree(string);
1793 string = NULL;
1794 }
1795
1796 if (!sloppy && invalid) {
1797 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1798 goto cifs_parse_mount_err;
1799 }
1800
1801 #ifndef CONFIG_KEYS
1802 /* Muliuser mounts require CONFIG_KEYS support */
1803 if (vol->multiuser) {
1804 cERROR(1, "Multiuser mounts require kernels with "
1805 "CONFIG_KEYS enabled.");
1806 goto cifs_parse_mount_err;
1807 }
1808 #endif
1809
1810 if (vol->UNCip == NULL)
1811 vol->UNCip = &vol->UNC[2];
1812
1813 if (uid_specified)
1814 vol->override_uid = override_uid;
1815 else if (override_uid == 1)
1816 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1817 "specified with no uid= option.\n");
1818
1819 if (gid_specified)
1820 vol->override_gid = override_gid;
1821 else if (override_gid == 1)
1822 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1823 "specified with no gid= option.\n");
1824
1825 /* FIXME: remove this block in 3.7 */
1826 if (!cache_specified && !cache_warned) {
1827 cache_warned = true;
1828 printk(KERN_NOTICE "CIFS: no cache= option specified, using "
1829 "\"cache=loose\". This default will change "
1830 "to \"cache=strict\" in 3.7.\n");
1831 }
1832
1833 kfree(mountdata_copy);
1834 return 0;
1835
1836 out_nomem:
1837 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1838 cifs_parse_mount_err:
1839 kfree(string);
1840 kfree(mountdata_copy);
1841 return 1;
1842 }
1843
1844 /** Returns true if srcaddr isn't specified and rhs isn't
1845 * specified, or if srcaddr is specified and
1846 * matches the IP address of the rhs argument.
1847 */
1848 static bool
1849 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1850 {
1851 switch (srcaddr->sa_family) {
1852 case AF_UNSPEC:
1853 return (rhs->sa_family == AF_UNSPEC);
1854 case AF_INET: {
1855 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1856 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1857 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1858 }
1859 case AF_INET6: {
1860 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1861 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1862 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1863 }
1864 default:
1865 WARN_ON(1);
1866 return false; /* don't expect to be here */
1867 }
1868 }
1869
1870 /*
1871 * If no port is specified in addr structure, we try to match with 445 port
1872 * and if it fails - with 139 ports. It should be called only if address
1873 * families of server and addr are equal.
1874 */
1875 static bool
1876 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1877 {
1878 __be16 port, *sport;
1879
1880 switch (addr->sa_family) {
1881 case AF_INET:
1882 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1883 port = ((struct sockaddr_in *) addr)->sin_port;
1884 break;
1885 case AF_INET6:
1886 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1887 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1888 break;
1889 default:
1890 WARN_ON(1);
1891 return false;
1892 }
1893
1894 if (!port) {
1895 port = htons(CIFS_PORT);
1896 if (port == *sport)
1897 return true;
1898
1899 port = htons(RFC1001_PORT);
1900 }
1901
1902 return port == *sport;
1903 }
1904
1905 static bool
1906 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1907 struct sockaddr *srcaddr)
1908 {
1909 switch (addr->sa_family) {
1910 case AF_INET: {
1911 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1912 struct sockaddr_in *srv_addr4 =
1913 (struct sockaddr_in *)&server->dstaddr;
1914
1915 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1916 return false;
1917 break;
1918 }
1919 case AF_INET6: {
1920 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1921 struct sockaddr_in6 *srv_addr6 =
1922 (struct sockaddr_in6 *)&server->dstaddr;
1923
1924 if (!ipv6_addr_equal(&addr6->sin6_addr,
1925 &srv_addr6->sin6_addr))
1926 return false;
1927 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1928 return false;
1929 break;
1930 }
1931 default:
1932 WARN_ON(1);
1933 return false; /* don't expect to be here */
1934 }
1935
1936 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1937 return false;
1938
1939 return true;
1940 }
1941
1942 static bool
1943 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1944 {
1945 unsigned int secFlags;
1946
1947 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1948 secFlags = vol->secFlg;
1949 else
1950 secFlags = global_secflags | vol->secFlg;
1951
1952 switch (server->secType) {
1953 case LANMAN:
1954 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1955 return false;
1956 break;
1957 case NTLMv2:
1958 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1959 return false;
1960 break;
1961 case NTLM:
1962 if (!(secFlags & CIFSSEC_MAY_NTLM))
1963 return false;
1964 break;
1965 case Kerberos:
1966 if (!(secFlags & CIFSSEC_MAY_KRB5))
1967 return false;
1968 break;
1969 case RawNTLMSSP:
1970 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1971 return false;
1972 break;
1973 default:
1974 /* shouldn't happen */
1975 return false;
1976 }
1977
1978 /* now check if signing mode is acceptable */
1979 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1980 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1981 return false;
1982 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1983 (server->sec_mode &
1984 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1985 return false;
1986
1987 return true;
1988 }
1989
1990 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1991 struct smb_vol *vol)
1992 {
1993 if ((server->vals != vol->vals) || (server->ops != vol->ops))
1994 return 0;
1995
1996 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1997 return 0;
1998
1999 if (!match_address(server, addr,
2000 (struct sockaddr *)&vol->srcaddr))
2001 return 0;
2002
2003 if (!match_port(server, addr))
2004 return 0;
2005
2006 if (!match_security(server, vol))
2007 return 0;
2008
2009 return 1;
2010 }
2011
2012 static struct TCP_Server_Info *
2013 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
2014 {
2015 struct TCP_Server_Info *server;
2016
2017 spin_lock(&cifs_tcp_ses_lock);
2018 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2019 if (!match_server(server, addr, vol))
2020 continue;
2021
2022 ++server->srv_count;
2023 spin_unlock(&cifs_tcp_ses_lock);
2024 cFYI(1, "Existing tcp session with server found");
2025 return server;
2026 }
2027 spin_unlock(&cifs_tcp_ses_lock);
2028 return NULL;
2029 }
2030
2031 static void
2032 cifs_put_tcp_session(struct TCP_Server_Info *server)
2033 {
2034 struct task_struct *task;
2035
2036 spin_lock(&cifs_tcp_ses_lock);
2037 if (--server->srv_count > 0) {
2038 spin_unlock(&cifs_tcp_ses_lock);
2039 return;
2040 }
2041
2042 put_net(cifs_net_ns(server));
2043
2044 list_del_init(&server->tcp_ses_list);
2045 spin_unlock(&cifs_tcp_ses_lock);
2046
2047 cancel_delayed_work_sync(&server->echo);
2048
2049 spin_lock(&GlobalMid_Lock);
2050 server->tcpStatus = CifsExiting;
2051 spin_unlock(&GlobalMid_Lock);
2052
2053 cifs_crypto_shash_release(server);
2054 cifs_fscache_release_client_cookie(server);
2055
2056 kfree(server->session_key.response);
2057 server->session_key.response = NULL;
2058 server->session_key.len = 0;
2059
2060 task = xchg(&server->tsk, NULL);
2061 if (task)
2062 force_sig(SIGKILL, task);
2063 }
2064
2065 static struct TCP_Server_Info *
2066 cifs_get_tcp_session(struct smb_vol *volume_info)
2067 {
2068 struct TCP_Server_Info *tcp_ses = NULL;
2069 struct sockaddr_storage addr;
2070 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
2071 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
2072 int rc;
2073
2074 memset(&addr, 0, sizeof(struct sockaddr_storage));
2075
2076 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
2077
2078 if (volume_info->UNCip && volume_info->UNC) {
2079 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2080 volume_info->UNCip,
2081 strlen(volume_info->UNCip),
2082 volume_info->port);
2083 if (!rc) {
2084 /* we failed translating address */
2085 rc = -EINVAL;
2086 goto out_err;
2087 }
2088 } else if (volume_info->UNCip) {
2089 /* BB using ip addr as tcp_ses name to connect to the
2090 DFS root below */
2091 cERROR(1, "Connecting to DFS root not implemented yet");
2092 rc = -EINVAL;
2093 goto out_err;
2094 } else /* which tcp_sess DFS root would we conect to */ {
2095 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
2096 "unc=//192.168.1.100/public) specified");
2097 rc = -EINVAL;
2098 goto out_err;
2099 }
2100
2101 /* see if we already have a matching tcp_ses */
2102 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
2103 if (tcp_ses)
2104 return tcp_ses;
2105
2106 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2107 if (!tcp_ses) {
2108 rc = -ENOMEM;
2109 goto out_err;
2110 }
2111
2112 rc = cifs_crypto_shash_allocate(tcp_ses);
2113 if (rc) {
2114 cERROR(1, "could not setup hash structures rc %d", rc);
2115 goto out_err;
2116 }
2117
2118 tcp_ses->ops = volume_info->ops;
2119 tcp_ses->vals = volume_info->vals;
2120 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2121 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2122 if (IS_ERR(tcp_ses->hostname)) {
2123 rc = PTR_ERR(tcp_ses->hostname);
2124 goto out_err_crypto_release;
2125 }
2126
2127 tcp_ses->noblocksnd = volume_info->noblocksnd;
2128 tcp_ses->noautotune = volume_info->noautotune;
2129 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2130 tcp_ses->in_flight = 0;
2131 tcp_ses->credits = 1;
2132 init_waitqueue_head(&tcp_ses->response_q);
2133 init_waitqueue_head(&tcp_ses->request_q);
2134 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2135 mutex_init(&tcp_ses->srv_mutex);
2136 memcpy(tcp_ses->workstation_RFC1001_name,
2137 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2138 memcpy(tcp_ses->server_RFC1001_name,
2139 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2140 tcp_ses->session_estab = false;
2141 tcp_ses->sequence_number = 0;
2142 tcp_ses->lstrp = jiffies;
2143 spin_lock_init(&tcp_ses->req_lock);
2144 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2145 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2146 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2147
2148 /*
2149 * at this point we are the only ones with the pointer
2150 * to the struct since the kernel thread not created yet
2151 * no need to spinlock this init of tcpStatus or srv_count
2152 */
2153 tcp_ses->tcpStatus = CifsNew;
2154 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2155 sizeof(tcp_ses->srcaddr));
2156 ++tcp_ses->srv_count;
2157
2158 if (addr.ss_family == AF_INET6) {
2159 cFYI(1, "attempting ipv6 connect");
2160 /* BB should we allow ipv6 on port 139? */
2161 /* other OS never observed in Wild doing 139 with v6 */
2162 memcpy(&tcp_ses->dstaddr, sin_server6,
2163 sizeof(struct sockaddr_in6));
2164 } else
2165 memcpy(&tcp_ses->dstaddr, sin_server,
2166 sizeof(struct sockaddr_in));
2167
2168 rc = ip_connect(tcp_ses);
2169 if (rc < 0) {
2170 cERROR(1, "Error connecting to socket. Aborting operation");
2171 goto out_err_crypto_release;
2172 }
2173
2174 /*
2175 * since we're in a cifs function already, we know that
2176 * this will succeed. No need for try_module_get().
2177 */
2178 __module_get(THIS_MODULE);
2179 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2180 tcp_ses, "cifsd");
2181 if (IS_ERR(tcp_ses->tsk)) {
2182 rc = PTR_ERR(tcp_ses->tsk);
2183 cERROR(1, "error %d create cifsd thread", rc);
2184 module_put(THIS_MODULE);
2185 goto out_err_crypto_release;
2186 }
2187 tcp_ses->tcpStatus = CifsNeedNegotiate;
2188
2189 /* thread spawned, put it on the list */
2190 spin_lock(&cifs_tcp_ses_lock);
2191 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2192 spin_unlock(&cifs_tcp_ses_lock);
2193
2194 cifs_fscache_get_client_cookie(tcp_ses);
2195
2196 /* queue echo request delayed work */
2197 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2198
2199 return tcp_ses;
2200
2201 out_err_crypto_release:
2202 cifs_crypto_shash_release(tcp_ses);
2203
2204 put_net(cifs_net_ns(tcp_ses));
2205
2206 out_err:
2207 if (tcp_ses) {
2208 if (!IS_ERR(tcp_ses->hostname))
2209 kfree(tcp_ses->hostname);
2210 if (tcp_ses->ssocket)
2211 sock_release(tcp_ses->ssocket);
2212 kfree(tcp_ses);
2213 }
2214 return ERR_PTR(rc);
2215 }
2216
2217 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2218 {
2219 switch (ses->server->secType) {
2220 case Kerberos:
2221 if (vol->cred_uid != ses->cred_uid)
2222 return 0;
2223 break;
2224 default:
2225 /* NULL username means anonymous session */
2226 if (ses->user_name == NULL) {
2227 if (!vol->nullauth)
2228 return 0;
2229 break;
2230 }
2231
2232 /* anything else takes username/password */
2233 if (strncmp(ses->user_name,
2234 vol->username ? vol->username : "",
2235 MAX_USERNAME_SIZE))
2236 return 0;
2237 if (strlen(vol->username) != 0 &&
2238 ses->password != NULL &&
2239 strncmp(ses->password,
2240 vol->password ? vol->password : "",
2241 MAX_PASSWORD_SIZE))
2242 return 0;
2243 }
2244 return 1;
2245 }
2246
2247 static struct cifs_ses *
2248 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2249 {
2250 struct cifs_ses *ses;
2251
2252 spin_lock(&cifs_tcp_ses_lock);
2253 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2254 if (!match_session(ses, vol))
2255 continue;
2256 ++ses->ses_count;
2257 spin_unlock(&cifs_tcp_ses_lock);
2258 return ses;
2259 }
2260 spin_unlock(&cifs_tcp_ses_lock);
2261 return NULL;
2262 }
2263
2264 static void
2265 cifs_put_smb_ses(struct cifs_ses *ses)
2266 {
2267 unsigned int xid;
2268 struct TCP_Server_Info *server = ses->server;
2269
2270 cFYI(1, "%s: ses_count=%d", __func__, ses->ses_count);
2271 spin_lock(&cifs_tcp_ses_lock);
2272 if (--ses->ses_count > 0) {
2273 spin_unlock(&cifs_tcp_ses_lock);
2274 return;
2275 }
2276
2277 list_del_init(&ses->smb_ses_list);
2278 spin_unlock(&cifs_tcp_ses_lock);
2279
2280 if (ses->status == CifsGood && server->ops->logoff) {
2281 xid = get_xid();
2282 server->ops->logoff(xid, ses);
2283 _free_xid(xid);
2284 }
2285 sesInfoFree(ses);
2286 cifs_put_tcp_session(server);
2287 }
2288
2289 #ifdef CONFIG_KEYS
2290
2291 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2292 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2293
2294 /* Populate username and pw fields from keyring if possible */
2295 static int
2296 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2297 {
2298 int rc = 0;
2299 char *desc, *delim, *payload;
2300 ssize_t len;
2301 struct key *key;
2302 struct TCP_Server_Info *server = ses->server;
2303 struct sockaddr_in *sa;
2304 struct sockaddr_in6 *sa6;
2305 struct user_key_payload *upayload;
2306
2307 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2308 if (!desc)
2309 return -ENOMEM;
2310
2311 /* try to find an address key first */
2312 switch (server->dstaddr.ss_family) {
2313 case AF_INET:
2314 sa = (struct sockaddr_in *)&server->dstaddr;
2315 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2316 break;
2317 case AF_INET6:
2318 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2319 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2320 break;
2321 default:
2322 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2323 rc = -EINVAL;
2324 goto out_err;
2325 }
2326
2327 cFYI(1, "%s: desc=%s", __func__, desc);
2328 key = request_key(&key_type_logon, desc, "");
2329 if (IS_ERR(key)) {
2330 if (!ses->domainName) {
2331 cFYI(1, "domainName is NULL");
2332 rc = PTR_ERR(key);
2333 goto out_err;
2334 }
2335
2336 /* didn't work, try to find a domain key */
2337 sprintf(desc, "cifs:d:%s", ses->domainName);
2338 cFYI(1, "%s: desc=%s", __func__, desc);
2339 key = request_key(&key_type_logon, desc, "");
2340 if (IS_ERR(key)) {
2341 rc = PTR_ERR(key);
2342 goto out_err;
2343 }
2344 }
2345
2346 down_read(&key->sem);
2347 upayload = key->payload.data;
2348 if (IS_ERR_OR_NULL(upayload)) {
2349 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2350 goto out_key_put;
2351 }
2352
2353 /* find first : in payload */
2354 payload = (char *)upayload->data;
2355 delim = strnchr(payload, upayload->datalen, ':');
2356 cFYI(1, "payload=%s", payload);
2357 if (!delim) {
2358 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2359 upayload->datalen);
2360 rc = -EINVAL;
2361 goto out_key_put;
2362 }
2363
2364 len = delim - payload;
2365 if (len > MAX_USERNAME_SIZE || len <= 0) {
2366 cFYI(1, "Bad value from username search (len=%zd)", len);
2367 rc = -EINVAL;
2368 goto out_key_put;
2369 }
2370
2371 vol->username = kstrndup(payload, len, GFP_KERNEL);
2372 if (!vol->username) {
2373 cFYI(1, "Unable to allocate %zd bytes for username", len);
2374 rc = -ENOMEM;
2375 goto out_key_put;
2376 }
2377 cFYI(1, "%s: username=%s", __func__, vol->username);
2378
2379 len = key->datalen - (len + 1);
2380 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2381 cFYI(1, "Bad len for password search (len=%zd)", len);
2382 rc = -EINVAL;
2383 kfree(vol->username);
2384 vol->username = NULL;
2385 goto out_key_put;
2386 }
2387
2388 ++delim;
2389 vol->password = kstrndup(delim, len, GFP_KERNEL);
2390 if (!vol->password) {
2391 cFYI(1, "Unable to allocate %zd bytes for password", len);
2392 rc = -ENOMEM;
2393 kfree(vol->username);
2394 vol->username = NULL;
2395 goto out_key_put;
2396 }
2397
2398 out_key_put:
2399 up_read(&key->sem);
2400 key_put(key);
2401 out_err:
2402 kfree(desc);
2403 cFYI(1, "%s: returning %d", __func__, rc);
2404 return rc;
2405 }
2406 #else /* ! CONFIG_KEYS */
2407 static inline int
2408 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2409 struct cifs_ses *ses __attribute__((unused)))
2410 {
2411 return -ENOSYS;
2412 }
2413 #endif /* CONFIG_KEYS */
2414
2415 static bool warned_on_ntlm; /* globals init to false automatically */
2416
2417 static struct cifs_ses *
2418 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2419 {
2420 int rc = -ENOMEM;
2421 unsigned int xid;
2422 struct cifs_ses *ses;
2423 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2424 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2425
2426 xid = get_xid();
2427
2428 ses = cifs_find_smb_ses(server, volume_info);
2429 if (ses) {
2430 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2431
2432 mutex_lock(&ses->session_mutex);
2433 rc = cifs_negotiate_protocol(xid, ses);
2434 if (rc) {
2435 mutex_unlock(&ses->session_mutex);
2436 /* problem -- put our ses reference */
2437 cifs_put_smb_ses(ses);
2438 free_xid(xid);
2439 return ERR_PTR(rc);
2440 }
2441 if (ses->need_reconnect) {
2442 cFYI(1, "Session needs reconnect");
2443 rc = cifs_setup_session(xid, ses,
2444 volume_info->local_nls);
2445 if (rc) {
2446 mutex_unlock(&ses->session_mutex);
2447 /* problem -- put our reference */
2448 cifs_put_smb_ses(ses);
2449 free_xid(xid);
2450 return ERR_PTR(rc);
2451 }
2452 }
2453 mutex_unlock(&ses->session_mutex);
2454
2455 /* existing SMB ses has a server reference already */
2456 cifs_put_tcp_session(server);
2457 free_xid(xid);
2458 return ses;
2459 }
2460
2461 cFYI(1, "Existing smb sess not found");
2462 ses = sesInfoAlloc();
2463 if (ses == NULL)
2464 goto get_ses_fail;
2465
2466 /* new SMB session uses our server ref */
2467 ses->server = server;
2468 if (server->dstaddr.ss_family == AF_INET6)
2469 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2470 else
2471 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2472
2473 if (volume_info->username) {
2474 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2475 if (!ses->user_name)
2476 goto get_ses_fail;
2477 }
2478
2479 /* volume_info->password freed at unmount */
2480 if (volume_info->password) {
2481 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2482 if (!ses->password)
2483 goto get_ses_fail;
2484 }
2485 if (volume_info->domainname) {
2486 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2487 if (!ses->domainName)
2488 goto get_ses_fail;
2489 }
2490 ses->cred_uid = volume_info->cred_uid;
2491 ses->linux_uid = volume_info->linux_uid;
2492
2493 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2494 supported for many years, time to update default security mechanism */
2495 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2496 warned_on_ntlm = true;
2497 cERROR(1, "default security mechanism requested. The default "
2498 "security mechanism will be upgraded from ntlm to "
2499 "ntlmv2 in kernel release 3.3");
2500 }
2501 ses->overrideSecFlg = volume_info->secFlg;
2502
2503 mutex_lock(&ses->session_mutex);
2504 rc = cifs_negotiate_protocol(xid, ses);
2505 if (!rc)
2506 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2507 mutex_unlock(&ses->session_mutex);
2508 if (rc)
2509 goto get_ses_fail;
2510
2511 /* success, put it on the list */
2512 spin_lock(&cifs_tcp_ses_lock);
2513 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2514 spin_unlock(&cifs_tcp_ses_lock);
2515
2516 free_xid(xid);
2517 return ses;
2518
2519 get_ses_fail:
2520 sesInfoFree(ses);
2521 free_xid(xid);
2522 return ERR_PTR(rc);
2523 }
2524
2525 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2526 {
2527 if (tcon->tidStatus == CifsExiting)
2528 return 0;
2529 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2530 return 0;
2531 return 1;
2532 }
2533
2534 static struct cifs_tcon *
2535 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2536 {
2537 struct list_head *tmp;
2538 struct cifs_tcon *tcon;
2539
2540 spin_lock(&cifs_tcp_ses_lock);
2541 list_for_each(tmp, &ses->tcon_list) {
2542 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2543 if (!match_tcon(tcon, unc))
2544 continue;
2545 ++tcon->tc_count;
2546 spin_unlock(&cifs_tcp_ses_lock);
2547 return tcon;
2548 }
2549 spin_unlock(&cifs_tcp_ses_lock);
2550 return NULL;
2551 }
2552
2553 static void
2554 cifs_put_tcon(struct cifs_tcon *tcon)
2555 {
2556 unsigned int xid;
2557 struct cifs_ses *ses = tcon->ses;
2558
2559 cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
2560 spin_lock(&cifs_tcp_ses_lock);
2561 if (--tcon->tc_count > 0) {
2562 spin_unlock(&cifs_tcp_ses_lock);
2563 return;
2564 }
2565
2566 list_del_init(&tcon->tcon_list);
2567 spin_unlock(&cifs_tcp_ses_lock);
2568
2569 xid = get_xid();
2570 if (ses->server->ops->tree_disconnect)
2571 ses->server->ops->tree_disconnect(xid, tcon);
2572 _free_xid(xid);
2573
2574 cifs_fscache_release_super_cookie(tcon);
2575 tconInfoFree(tcon);
2576 cifs_put_smb_ses(ses);
2577 }
2578
2579 static struct cifs_tcon *
2580 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2581 {
2582 int rc, xid;
2583 struct cifs_tcon *tcon;
2584
2585 tcon = cifs_find_tcon(ses, volume_info->UNC);
2586 if (tcon) {
2587 cFYI(1, "Found match on UNC path");
2588 /* existing tcon already has a reference */
2589 cifs_put_smb_ses(ses);
2590 if (tcon->seal != volume_info->seal)
2591 cERROR(1, "transport encryption setting "
2592 "conflicts with existing tid");
2593 return tcon;
2594 }
2595
2596 if (!ses->server->ops->tree_connect) {
2597 rc = -ENOSYS;
2598 goto out_fail;
2599 }
2600
2601 tcon = tconInfoAlloc();
2602 if (tcon == NULL) {
2603 rc = -ENOMEM;
2604 goto out_fail;
2605 }
2606
2607 tcon->ses = ses;
2608 if (volume_info->password) {
2609 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2610 if (!tcon->password) {
2611 rc = -ENOMEM;
2612 goto out_fail;
2613 }
2614 }
2615
2616 if (strchr(volume_info->UNC + 3, '\\') == NULL
2617 && strchr(volume_info->UNC + 3, '/') == NULL) {
2618 cERROR(1, "Missing share name");
2619 rc = -ENODEV;
2620 goto out_fail;
2621 }
2622
2623 /*
2624 * BB Do we need to wrap session_mutex around this TCon call and Unix
2625 * SetFS as we do on SessSetup and reconnect?
2626 */
2627 xid = get_xid();
2628 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2629 volume_info->local_nls);
2630 free_xid(xid);
2631 cFYI(1, "Tcon rc = %d", rc);
2632 if (rc)
2633 goto out_fail;
2634
2635 if (volume_info->nodfs) {
2636 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2637 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2638 }
2639 tcon->seal = volume_info->seal;
2640 /*
2641 * We can have only one retry value for a connection to a share so for
2642 * resources mounted more than once to the same server share the last
2643 * value passed in for the retry flag is used.
2644 */
2645 tcon->retry = volume_info->retry;
2646 tcon->nocase = volume_info->nocase;
2647 tcon->local_lease = volume_info->local_lease;
2648 INIT_LIST_HEAD(&tcon->pending_opens);
2649
2650 spin_lock(&cifs_tcp_ses_lock);
2651 list_add(&tcon->tcon_list, &ses->tcon_list);
2652 spin_unlock(&cifs_tcp_ses_lock);
2653
2654 cifs_fscache_get_super_cookie(tcon);
2655
2656 return tcon;
2657
2658 out_fail:
2659 tconInfoFree(tcon);
2660 return ERR_PTR(rc);
2661 }
2662
2663 void
2664 cifs_put_tlink(struct tcon_link *tlink)
2665 {
2666 if (!tlink || IS_ERR(tlink))
2667 return;
2668
2669 if (!atomic_dec_and_test(&tlink->tl_count) ||
2670 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2671 tlink->tl_time = jiffies;
2672 return;
2673 }
2674
2675 if (!IS_ERR(tlink_tcon(tlink)))
2676 cifs_put_tcon(tlink_tcon(tlink));
2677 kfree(tlink);
2678 return;
2679 }
2680
2681 static inline struct tcon_link *
2682 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2683 {
2684 return cifs_sb->master_tlink;
2685 }
2686
2687 static int
2688 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2689 {
2690 struct cifs_sb_info *old = CIFS_SB(sb);
2691 struct cifs_sb_info *new = mnt_data->cifs_sb;
2692
2693 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2694 return 0;
2695
2696 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2697 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2698 return 0;
2699
2700 /*
2701 * We want to share sb only if we don't specify an r/wsize or
2702 * specified r/wsize is greater than or equal to existing one.
2703 */
2704 if (new->wsize && new->wsize < old->wsize)
2705 return 0;
2706
2707 if (new->rsize && new->rsize < old->rsize)
2708 return 0;
2709
2710 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2711 return 0;
2712
2713 if (old->mnt_file_mode != new->mnt_file_mode ||
2714 old->mnt_dir_mode != new->mnt_dir_mode)
2715 return 0;
2716
2717 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2718 return 0;
2719
2720 if (old->actimeo != new->actimeo)
2721 return 0;
2722
2723 return 1;
2724 }
2725
2726 int
2727 cifs_match_super(struct super_block *sb, void *data)
2728 {
2729 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2730 struct smb_vol *volume_info;
2731 struct cifs_sb_info *cifs_sb;
2732 struct TCP_Server_Info *tcp_srv;
2733 struct cifs_ses *ses;
2734 struct cifs_tcon *tcon;
2735 struct tcon_link *tlink;
2736 struct sockaddr_storage addr;
2737 int rc = 0;
2738
2739 memset(&addr, 0, sizeof(struct sockaddr_storage));
2740
2741 spin_lock(&cifs_tcp_ses_lock);
2742 cifs_sb = CIFS_SB(sb);
2743 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2744 if (IS_ERR(tlink)) {
2745 spin_unlock(&cifs_tcp_ses_lock);
2746 return rc;
2747 }
2748 tcon = tlink_tcon(tlink);
2749 ses = tcon->ses;
2750 tcp_srv = ses->server;
2751
2752 volume_info = mnt_data->vol;
2753
2754 if (!volume_info->UNCip || !volume_info->UNC)
2755 goto out;
2756
2757 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2758 volume_info->UNCip,
2759 strlen(volume_info->UNCip),
2760 volume_info->port);
2761 if (!rc)
2762 goto out;
2763
2764 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2765 !match_session(ses, volume_info) ||
2766 !match_tcon(tcon, volume_info->UNC)) {
2767 rc = 0;
2768 goto out;
2769 }
2770
2771 rc = compare_mount_options(sb, mnt_data);
2772 out:
2773 spin_unlock(&cifs_tcp_ses_lock);
2774 cifs_put_tlink(tlink);
2775 return rc;
2776 }
2777
2778 int
2779 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2780 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2781 struct dfs_info3_param **referrals, int remap)
2782 {
2783 char *temp_unc;
2784 int rc = 0;
2785
2786 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2787 return -ENOSYS;
2788
2789 *num_referrals = 0;
2790 *referrals = NULL;
2791
2792 if (ses->ipc_tid == 0) {
2793 temp_unc = kmalloc(2 /* for slashes */ +
2794 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2795 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2796 if (temp_unc == NULL)
2797 return -ENOMEM;
2798 temp_unc[0] = '\\';
2799 temp_unc[1] = '\\';
2800 strcpy(temp_unc + 2, ses->serverName);
2801 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2802 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2803 nls_codepage);
2804 cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
2805 kfree(temp_unc);
2806 }
2807 if (rc == 0)
2808 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2809 referrals, num_referrals,
2810 nls_codepage, remap);
2811 /*
2812 * BB - map targetUNCs to dfs_info3 structures, here or in
2813 * ses->server->ops->get_dfs_refer.
2814 */
2815
2816 return rc;
2817 }
2818
2819 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2820 static struct lock_class_key cifs_key[2];
2821 static struct lock_class_key cifs_slock_key[2];
2822
2823 static inline void
2824 cifs_reclassify_socket4(struct socket *sock)
2825 {
2826 struct sock *sk = sock->sk;
2827 BUG_ON(sock_owned_by_user(sk));
2828 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2829 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2830 }
2831
2832 static inline void
2833 cifs_reclassify_socket6(struct socket *sock)
2834 {
2835 struct sock *sk = sock->sk;
2836 BUG_ON(sock_owned_by_user(sk));
2837 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2838 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2839 }
2840 #else
2841 static inline void
2842 cifs_reclassify_socket4(struct socket *sock)
2843 {
2844 }
2845
2846 static inline void
2847 cifs_reclassify_socket6(struct socket *sock)
2848 {
2849 }
2850 #endif
2851
2852 /* See RFC1001 section 14 on representation of Netbios names */
2853 static void rfc1002mangle(char *target, char *source, unsigned int length)
2854 {
2855 unsigned int i, j;
2856
2857 for (i = 0, j = 0; i < (length); i++) {
2858 /* mask a nibble at a time and encode */
2859 target[j] = 'A' + (0x0F & (source[i] >> 4));
2860 target[j+1] = 'A' + (0x0F & source[i]);
2861 j += 2;
2862 }
2863
2864 }
2865
2866 static int
2867 bind_socket(struct TCP_Server_Info *server)
2868 {
2869 int rc = 0;
2870 if (server->srcaddr.ss_family != AF_UNSPEC) {
2871 /* Bind to the specified local IP address */
2872 struct socket *socket = server->ssocket;
2873 rc = socket->ops->bind(socket,
2874 (struct sockaddr *) &server->srcaddr,
2875 sizeof(server->srcaddr));
2876 if (rc < 0) {
2877 struct sockaddr_in *saddr4;
2878 struct sockaddr_in6 *saddr6;
2879 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2880 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2881 if (saddr6->sin6_family == AF_INET6)
2882 cERROR(1, "cifs: "
2883 "Failed to bind to: %pI6c, error: %d",
2884 &saddr6->sin6_addr, rc);
2885 else
2886 cERROR(1, "cifs: "
2887 "Failed to bind to: %pI4, error: %d",
2888 &saddr4->sin_addr.s_addr, rc);
2889 }
2890 }
2891 return rc;
2892 }
2893
2894 static int
2895 ip_rfc1001_connect(struct TCP_Server_Info *server)
2896 {
2897 int rc = 0;
2898 /*
2899 * some servers require RFC1001 sessinit before sending
2900 * negprot - BB check reconnection in case where second
2901 * sessinit is sent but no second negprot
2902 */
2903 struct rfc1002_session_packet *ses_init_buf;
2904 struct smb_hdr *smb_buf;
2905 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2906 GFP_KERNEL);
2907 if (ses_init_buf) {
2908 ses_init_buf->trailer.session_req.called_len = 32;
2909
2910 if (server->server_RFC1001_name &&
2911 server->server_RFC1001_name[0] != 0)
2912 rfc1002mangle(ses_init_buf->trailer.
2913 session_req.called_name,
2914 server->server_RFC1001_name,
2915 RFC1001_NAME_LEN_WITH_NULL);
2916 else
2917 rfc1002mangle(ses_init_buf->trailer.
2918 session_req.called_name,
2919 DEFAULT_CIFS_CALLED_NAME,
2920 RFC1001_NAME_LEN_WITH_NULL);
2921
2922 ses_init_buf->trailer.session_req.calling_len = 32;
2923
2924 /*
2925 * calling name ends in null (byte 16) from old smb
2926 * convention.
2927 */
2928 if (server->workstation_RFC1001_name &&
2929 server->workstation_RFC1001_name[0] != 0)
2930 rfc1002mangle(ses_init_buf->trailer.
2931 session_req.calling_name,
2932 server->workstation_RFC1001_name,
2933 RFC1001_NAME_LEN_WITH_NULL);
2934 else
2935 rfc1002mangle(ses_init_buf->trailer.
2936 session_req.calling_name,
2937 "LINUX_CIFS_CLNT",
2938 RFC1001_NAME_LEN_WITH_NULL);
2939
2940 ses_init_buf->trailer.session_req.scope1 = 0;
2941 ses_init_buf->trailer.session_req.scope2 = 0;
2942 smb_buf = (struct smb_hdr *)ses_init_buf;
2943
2944 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2945 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2946 rc = smb_send(server, smb_buf, 0x44);
2947 kfree(ses_init_buf);
2948 /*
2949 * RFC1001 layer in at least one server
2950 * requires very short break before negprot
2951 * presumably because not expecting negprot
2952 * to follow so fast. This is a simple
2953 * solution that works without
2954 * complicating the code and causes no
2955 * significant slowing down on mount
2956 * for everyone else
2957 */
2958 usleep_range(1000, 2000);
2959 }
2960 /*
2961 * else the negprot may still work without this
2962 * even though malloc failed
2963 */
2964
2965 return rc;
2966 }
2967
2968 static int
2969 generic_ip_connect(struct TCP_Server_Info *server)
2970 {
2971 int rc = 0;
2972 __be16 sport;
2973 int slen, sfamily;
2974 struct socket *socket = server->ssocket;
2975 struct sockaddr *saddr;
2976
2977 saddr = (struct sockaddr *) &server->dstaddr;
2978
2979 if (server->dstaddr.ss_family == AF_INET6) {
2980 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2981 slen = sizeof(struct sockaddr_in6);
2982 sfamily = AF_INET6;
2983 } else {
2984 sport = ((struct sockaddr_in *) saddr)->sin_port;
2985 slen = sizeof(struct sockaddr_in);
2986 sfamily = AF_INET;
2987 }
2988
2989 if (socket == NULL) {
2990 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2991 IPPROTO_TCP, &socket, 1);
2992 if (rc < 0) {
2993 cERROR(1, "Error %d creating socket", rc);
2994 server->ssocket = NULL;
2995 return rc;
2996 }
2997
2998 /* BB other socket options to set KEEPALIVE, NODELAY? */
2999 cFYI(1, "Socket created");
3000 server->ssocket = socket;
3001 socket->sk->sk_allocation = GFP_NOFS;
3002 if (sfamily == AF_INET6)
3003 cifs_reclassify_socket6(socket);
3004 else
3005 cifs_reclassify_socket4(socket);
3006 }
3007
3008 rc = bind_socket(server);
3009 if (rc < 0)
3010 return rc;
3011
3012 /*
3013 * Eventually check for other socket options to change from
3014 * the default. sock_setsockopt not used because it expects
3015 * user space buffer
3016 */
3017 socket->sk->sk_rcvtimeo = 7 * HZ;
3018 socket->sk->sk_sndtimeo = 5 * HZ;
3019
3020 /* make the bufsizes depend on wsize/rsize and max requests */
3021 if (server->noautotune) {
3022 if (socket->sk->sk_sndbuf < (200 * 1024))
3023 socket->sk->sk_sndbuf = 200 * 1024;
3024 if (socket->sk->sk_rcvbuf < (140 * 1024))
3025 socket->sk->sk_rcvbuf = 140 * 1024;
3026 }
3027
3028 if (server->tcp_nodelay) {
3029 int val = 1;
3030 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3031 (char *)&val, sizeof(val));
3032 if (rc)
3033 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3034 }
3035
3036 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3037 socket->sk->sk_sndbuf,
3038 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3039
3040 rc = socket->ops->connect(socket, saddr, slen, 0);
3041 if (rc < 0) {
3042 cFYI(1, "Error %d connecting to server", rc);
3043 sock_release(socket);
3044 server->ssocket = NULL;
3045 return rc;
3046 }
3047
3048 if (sport == htons(RFC1001_PORT))
3049 rc = ip_rfc1001_connect(server);
3050
3051 return rc;
3052 }
3053
3054 static int
3055 ip_connect(struct TCP_Server_Info *server)
3056 {
3057 __be16 *sport;
3058 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3059 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3060
3061 if (server->dstaddr.ss_family == AF_INET6)
3062 sport = &addr6->sin6_port;
3063 else
3064 sport = &addr->sin_port;
3065
3066 if (*sport == 0) {
3067 int rc;
3068
3069 /* try with 445 port at first */
3070 *sport = htons(CIFS_PORT);
3071
3072 rc = generic_ip_connect(server);
3073 if (rc >= 0)
3074 return rc;
3075
3076 /* if it failed, try with 139 port */
3077 *sport = htons(RFC1001_PORT);
3078 }
3079
3080 return generic_ip_connect(server);
3081 }
3082
3083 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3084 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3085 {
3086 /* if we are reconnecting then should we check to see if
3087 * any requested capabilities changed locally e.g. via
3088 * remount but we can not do much about it here
3089 * if they have (even if we could detect it by the following)
3090 * Perhaps we could add a backpointer to array of sb from tcon
3091 * or if we change to make all sb to same share the same
3092 * sb as NFS - then we only have one backpointer to sb.
3093 * What if we wanted to mount the server share twice once with
3094 * and once without posixacls or posix paths? */
3095 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3096
3097 if (vol_info && vol_info->no_linux_ext) {
3098 tcon->fsUnixInfo.Capability = 0;
3099 tcon->unix_ext = 0; /* Unix Extensions disabled */
3100 cFYI(1, "Linux protocol extensions disabled");
3101 return;
3102 } else if (vol_info)
3103 tcon->unix_ext = 1; /* Unix Extensions supported */
3104
3105 if (tcon->unix_ext == 0) {
3106 cFYI(1, "Unix extensions disabled so not set on reconnect");
3107 return;
3108 }
3109
3110 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3111 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3112 cFYI(1, "unix caps which server supports %lld", cap);
3113 /* check for reconnect case in which we do not
3114 want to change the mount behavior if we can avoid it */
3115 if (vol_info == NULL) {
3116 /* turn off POSIX ACL and PATHNAMES if not set
3117 originally at mount time */
3118 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3119 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3120 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3121 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3122 cERROR(1, "POSIXPATH support change");
3123 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3124 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3125 cERROR(1, "possible reconnect error");
3126 cERROR(1, "server disabled POSIX path support");
3127 }
3128 }
3129
3130 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3131 cERROR(1, "per-share encryption not supported yet");
3132
3133 cap &= CIFS_UNIX_CAP_MASK;
3134 if (vol_info && vol_info->no_psx_acl)
3135 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3136 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3137 cFYI(1, "negotiated posix acl support");
3138 if (cifs_sb)
3139 cifs_sb->mnt_cifs_flags |=
3140 CIFS_MOUNT_POSIXACL;
3141 }
3142
3143 if (vol_info && vol_info->posix_paths == 0)
3144 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3145 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3146 cFYI(1, "negotiate posix pathnames");
3147 if (cifs_sb)
3148 cifs_sb->mnt_cifs_flags |=
3149 CIFS_MOUNT_POSIX_PATHS;
3150 }
3151
3152 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3153 #ifdef CONFIG_CIFS_DEBUG2
3154 if (cap & CIFS_UNIX_FCNTL_CAP)
3155 cFYI(1, "FCNTL cap");
3156 if (cap & CIFS_UNIX_EXTATTR_CAP)
3157 cFYI(1, "EXTATTR cap");
3158 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3159 cFYI(1, "POSIX path cap");
3160 if (cap & CIFS_UNIX_XATTR_CAP)
3161 cFYI(1, "XATTR cap");
3162 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3163 cFYI(1, "POSIX ACL cap");
3164 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3165 cFYI(1, "very large read cap");
3166 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3167 cFYI(1, "very large write cap");
3168 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3169 cFYI(1, "transport encryption cap");
3170 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3171 cFYI(1, "mandatory transport encryption cap");
3172 #endif /* CIFS_DEBUG2 */
3173 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3174 if (vol_info == NULL) {
3175 cFYI(1, "resetting capabilities failed");
3176 } else
3177 cERROR(1, "Negotiating Unix capabilities "
3178 "with the server failed. Consider "
3179 "mounting with the Unix Extensions "
3180 "disabled if problems are found "
3181 "by specifying the nounix mount "
3182 "option.");
3183
3184 }
3185 }
3186 }
3187
3188 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3189 struct cifs_sb_info *cifs_sb)
3190 {
3191 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3192
3193 spin_lock_init(&cifs_sb->tlink_tree_lock);
3194 cifs_sb->tlink_tree = RB_ROOT;
3195
3196 /*
3197 * Temporarily set r/wsize for matching superblock. If we end up using
3198 * new sb then client will later negotiate it downward if needed.
3199 */
3200 cifs_sb->rsize = pvolume_info->rsize;
3201 cifs_sb->wsize = pvolume_info->wsize;
3202
3203 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3204 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3205 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3206 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3207 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3208 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3209
3210 cifs_sb->actimeo = pvolume_info->actimeo;
3211 cifs_sb->local_nls = pvolume_info->local_nls;
3212
3213 if (pvolume_info->noperm)
3214 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3215 if (pvolume_info->setuids)
3216 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3217 if (pvolume_info->server_ino)
3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3219 if (pvolume_info->remap)
3220 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3221 if (pvolume_info->no_xattr)
3222 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3223 if (pvolume_info->sfu_emul)
3224 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3225 if (pvolume_info->nobrl)
3226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3227 if (pvolume_info->nostrictsync)
3228 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3229 if (pvolume_info->mand_lock)
3230 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3231 if (pvolume_info->rwpidforward)
3232 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3233 if (pvolume_info->cifs_acl)
3234 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3235 if (pvolume_info->backupuid_specified) {
3236 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3237 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3238 }
3239 if (pvolume_info->backupgid_specified) {
3240 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3241 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3242 }
3243 if (pvolume_info->override_uid)
3244 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3245 if (pvolume_info->override_gid)
3246 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3247 if (pvolume_info->dynperm)
3248 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3249 if (pvolume_info->fsc)
3250 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3251 if (pvolume_info->multiuser)
3252 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3253 CIFS_MOUNT_NO_PERM);
3254 if (pvolume_info->strict_io)
3255 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3256 if (pvolume_info->direct_io) {
3257 cFYI(1, "mounting share using direct i/o");
3258 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3259 }
3260 if (pvolume_info->mfsymlinks) {
3261 if (pvolume_info->sfu_emul) {
3262 cERROR(1, "mount option mfsymlinks ignored if sfu "
3263 "mount option is used");
3264 } else {
3265 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3266 }
3267 }
3268
3269 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3270 cERROR(1, "mount option dynperm ignored if cifsacl "
3271 "mount option supported");
3272 }
3273
3274 static void
3275 cleanup_volume_info_contents(struct smb_vol *volume_info)
3276 {
3277 kfree(volume_info->username);
3278 kzfree(volume_info->password);
3279 if (volume_info->UNCip != volume_info->UNC + 2)
3280 kfree(volume_info->UNCip);
3281 kfree(volume_info->UNC);
3282 kfree(volume_info->domainname);
3283 kfree(volume_info->iocharset);
3284 kfree(volume_info->prepath);
3285 }
3286
3287 void
3288 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3289 {
3290 if (!volume_info)
3291 return;
3292 cleanup_volume_info_contents(volume_info);
3293 kfree(volume_info);
3294 }
3295
3296
3297 #ifdef CONFIG_CIFS_DFS_UPCALL
3298 /* build_path_to_root returns full path to root when
3299 * we do not have an exiting connection (tcon) */
3300 static char *
3301 build_unc_path_to_root(const struct smb_vol *vol,
3302 const struct cifs_sb_info *cifs_sb)
3303 {
3304 char *full_path, *pos;
3305 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
3306 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3307
3308 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3309 if (full_path == NULL)
3310 return ERR_PTR(-ENOMEM);
3311
3312 strncpy(full_path, vol->UNC, unc_len);
3313 pos = full_path + unc_len;
3314
3315 if (pplen) {
3316 strncpy(pos, vol->prepath, pplen);
3317 pos += pplen;
3318 }
3319
3320 *pos = '\0'; /* add trailing null */
3321 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3322 cFYI(1, "%s: full_path=%s", __func__, full_path);
3323 return full_path;
3324 }
3325
3326 /*
3327 * Perform a dfs referral query for a share and (optionally) prefix
3328 *
3329 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3330 * to a string containing updated options for the submount. Otherwise it
3331 * will be left untouched.
3332 *
3333 * Returns the rc from get_dfs_path to the caller, which can be used to
3334 * determine whether there were referrals.
3335 */
3336 static int
3337 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3338 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3339 int check_prefix)
3340 {
3341 int rc;
3342 unsigned int num_referrals = 0;
3343 struct dfs_info3_param *referrals = NULL;
3344 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3345
3346 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3347 if (IS_ERR(full_path))
3348 return PTR_ERR(full_path);
3349
3350 /* For DFS paths, skip the first '\' of the UNC */
3351 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3352
3353 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3354 &num_referrals, &referrals,
3355 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3356
3357 if (!rc && num_referrals > 0) {
3358 char *fake_devname = NULL;
3359
3360 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3361 full_path + 1, referrals,
3362 &fake_devname);
3363
3364 free_dfs_info_array(referrals, num_referrals);
3365
3366 if (IS_ERR(mdata)) {
3367 rc = PTR_ERR(mdata);
3368 mdata = NULL;
3369 } else {
3370 cleanup_volume_info_contents(volume_info);
3371 memset(volume_info, '\0', sizeof(*volume_info));
3372 rc = cifs_setup_volume_info(volume_info, mdata,
3373 fake_devname);
3374 }
3375 kfree(fake_devname);
3376 kfree(cifs_sb->mountdata);
3377 cifs_sb->mountdata = mdata;
3378 }
3379 kfree(full_path);
3380 return rc;
3381 }
3382 #endif
3383
3384 static int
3385 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3386 const char *devname)
3387 {
3388 int rc = 0;
3389
3390 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3391 return -EINVAL;
3392
3393
3394 if (volume_info->nullauth) {
3395 cFYI(1, "Anonymous login");
3396 kfree(volume_info->username);
3397 volume_info->username = NULL;
3398 } else if (volume_info->username) {
3399 /* BB fixme parse for domain name here */
3400 cFYI(1, "Username: %s", volume_info->username);
3401 } else {
3402 cifserror("No username specified");
3403 /* In userspace mount helper we can get user name from alternate
3404 locations such as env variables and files on disk */
3405 return -EINVAL;
3406 }
3407
3408 /* this is needed for ASCII cp to Unicode converts */
3409 if (volume_info->iocharset == NULL) {
3410 /* load_nls_default cannot return null */
3411 volume_info->local_nls = load_nls_default();
3412 } else {
3413 volume_info->local_nls = load_nls(volume_info->iocharset);
3414 if (volume_info->local_nls == NULL) {
3415 cERROR(1, "CIFS mount error: iocharset %s not found",
3416 volume_info->iocharset);
3417 return -ELIBACC;
3418 }
3419 }
3420
3421 return rc;
3422 }
3423
3424 struct smb_vol *
3425 cifs_get_volume_info(char *mount_data, const char *devname)
3426 {
3427 int rc;
3428 struct smb_vol *volume_info;
3429
3430 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3431 if (!volume_info)
3432 return ERR_PTR(-ENOMEM);
3433
3434 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3435 if (rc) {
3436 cifs_cleanup_volume_info(volume_info);
3437 volume_info = ERR_PTR(rc);
3438 }
3439
3440 return volume_info;
3441 }
3442
3443 int
3444 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3445 {
3446 int rc;
3447 unsigned int xid;
3448 struct cifs_ses *ses;
3449 struct cifs_tcon *tcon;
3450 struct TCP_Server_Info *server;
3451 char *full_path;
3452 struct tcon_link *tlink;
3453 #ifdef CONFIG_CIFS_DFS_UPCALL
3454 int referral_walks_count = 0;
3455 #endif
3456
3457 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3458 if (rc)
3459 return rc;
3460
3461 #ifdef CONFIG_CIFS_DFS_UPCALL
3462 try_mount_again:
3463 /* cleanup activities if we're chasing a referral */
3464 if (referral_walks_count) {
3465 if (tcon)
3466 cifs_put_tcon(tcon);
3467 else if (ses)
3468 cifs_put_smb_ses(ses);
3469
3470 free_xid(xid);
3471 }
3472 #endif
3473 rc = 0;
3474 tcon = NULL;
3475 ses = NULL;
3476 server = NULL;
3477 full_path = NULL;
3478 tlink = NULL;
3479
3480 xid = get_xid();
3481
3482 /* get a reference to a tcp session */
3483 server = cifs_get_tcp_session(volume_info);
3484 if (IS_ERR(server)) {
3485 rc = PTR_ERR(server);
3486 bdi_destroy(&cifs_sb->bdi);
3487 goto out;
3488 }
3489
3490 /* get a reference to a SMB session */
3491 ses = cifs_get_smb_ses(server, volume_info);
3492 if (IS_ERR(ses)) {
3493 rc = PTR_ERR(ses);
3494 ses = NULL;
3495 goto mount_fail_check;
3496 }
3497
3498 /* search for existing tcon to this server share */
3499 tcon = cifs_get_tcon(ses, volume_info);
3500 if (IS_ERR(tcon)) {
3501 rc = PTR_ERR(tcon);
3502 tcon = NULL;
3503 goto remote_path_check;
3504 }
3505
3506 /* tell server which Unix caps we support */
3507 if (cap_unix(tcon->ses)) {
3508 /* reset of caps checks mount to see if unix extensions
3509 disabled for just this mount */
3510 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3511 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3512 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3513 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3514 rc = -EACCES;
3515 goto mount_fail_check;
3516 }
3517 } else
3518 tcon->unix_ext = 0; /* server does not support them */
3519
3520 /* do not care if a following call succeed - informational */
3521 if (!tcon->ipc && server->ops->qfs_tcon)
3522 server->ops->qfs_tcon(xid, tcon);
3523
3524 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3525 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3526
3527 /* tune readahead according to rsize */
3528 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3529
3530 remote_path_check:
3531 #ifdef CONFIG_CIFS_DFS_UPCALL
3532 /*
3533 * Perform an unconditional check for whether there are DFS
3534 * referrals for this path without prefix, to provide support
3535 * for DFS referrals from w2k8 servers which don't seem to respond
3536 * with PATH_NOT_COVERED to requests that include the prefix.
3537 * Chase the referral if found, otherwise continue normally.
3538 */
3539 if (referral_walks_count == 0) {
3540 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3541 false);
3542 if (!refrc) {
3543 referral_walks_count++;
3544 goto try_mount_again;
3545 }
3546 }
3547 #endif
3548
3549 /* check if a whole path is not remote */
3550 if (!rc && tcon) {
3551 if (!server->ops->is_path_accessible) {
3552 rc = -ENOSYS;
3553 goto mount_fail_check;
3554 }
3555 /* build_path_to_root works only when we have a valid tcon */
3556 full_path = build_path_to_root(volume_info, cifs_sb, tcon);
3557 if (full_path == NULL) {
3558 rc = -ENOMEM;
3559 goto mount_fail_check;
3560 }
3561 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3562 full_path);
3563 if (rc != 0 && rc != -EREMOTE) {
3564 kfree(full_path);
3565 goto mount_fail_check;
3566 }
3567 kfree(full_path);
3568 }
3569
3570 /* get referral if needed */
3571 if (rc == -EREMOTE) {
3572 #ifdef CONFIG_CIFS_DFS_UPCALL
3573 if (referral_walks_count > MAX_NESTED_LINKS) {
3574 /*
3575 * BB: when we implement proper loop detection,
3576 * we will remove this check. But now we need it
3577 * to prevent an indefinite loop if 'DFS tree' is
3578 * misconfigured (i.e. has loops).
3579 */
3580 rc = -ELOOP;
3581 goto mount_fail_check;
3582 }
3583
3584 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3585
3586 if (!rc) {
3587 referral_walks_count++;
3588 goto try_mount_again;
3589 }
3590 goto mount_fail_check;
3591 #else /* No DFS support, return error on mount */
3592 rc = -EOPNOTSUPP;
3593 #endif
3594 }
3595
3596 if (rc)
3597 goto mount_fail_check;
3598
3599 /* now, hang the tcon off of the superblock */
3600 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3601 if (tlink == NULL) {
3602 rc = -ENOMEM;
3603 goto mount_fail_check;
3604 }
3605
3606 tlink->tl_uid = ses->linux_uid;
3607 tlink->tl_tcon = tcon;
3608 tlink->tl_time = jiffies;
3609 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3610 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3611
3612 cifs_sb->master_tlink = tlink;
3613 spin_lock(&cifs_sb->tlink_tree_lock);
3614 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3615 spin_unlock(&cifs_sb->tlink_tree_lock);
3616
3617 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3618 TLINK_IDLE_EXPIRE);
3619
3620 mount_fail_check:
3621 /* on error free sesinfo and tcon struct if needed */
3622 if (rc) {
3623 /* If find_unc succeeded then rc == 0 so we can not end */
3624 /* up accidentally freeing someone elses tcon struct */
3625 if (tcon)
3626 cifs_put_tcon(tcon);
3627 else if (ses)
3628 cifs_put_smb_ses(ses);
3629 else
3630 cifs_put_tcp_session(server);
3631 bdi_destroy(&cifs_sb->bdi);
3632 }
3633
3634 out:
3635 free_xid(xid);
3636 return rc;
3637 }
3638
3639 /*
3640 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3641 * pointer may be NULL.
3642 */
3643 int
3644 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3645 const char *tree, struct cifs_tcon *tcon,
3646 const struct nls_table *nls_codepage)
3647 {
3648 struct smb_hdr *smb_buffer;
3649 struct smb_hdr *smb_buffer_response;
3650 TCONX_REQ *pSMB;
3651 TCONX_RSP *pSMBr;
3652 unsigned char *bcc_ptr;
3653 int rc = 0;
3654 int length;
3655 __u16 bytes_left, count;
3656
3657 if (ses == NULL)
3658 return -EIO;
3659
3660 smb_buffer = cifs_buf_get();
3661 if (smb_buffer == NULL)
3662 return -ENOMEM;
3663
3664 smb_buffer_response = smb_buffer;
3665
3666 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3667 NULL /*no tid */ , 4 /*wct */ );
3668
3669 smb_buffer->Mid = get_next_mid(ses->server);
3670 smb_buffer->Uid = ses->Suid;
3671 pSMB = (TCONX_REQ *) smb_buffer;
3672 pSMBr = (TCONX_RSP *) smb_buffer_response;
3673
3674 pSMB->AndXCommand = 0xFF;
3675 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3676 bcc_ptr = &pSMB->Password[0];
3677 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3678 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3679 *bcc_ptr = 0; /* password is null byte */
3680 bcc_ptr++; /* skip password */
3681 /* already aligned so no need to do it below */
3682 } else {
3683 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3684 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3685 specified as required (when that support is added to
3686 the vfs in the future) as only NTLM or the much
3687 weaker LANMAN (which we do not send by default) is accepted
3688 by Samba (not sure whether other servers allow
3689 NTLMv2 password here) */
3690 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3691 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3692 (ses->server->secType == LANMAN))
3693 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3694 ses->server->sec_mode &
3695 SECMODE_PW_ENCRYPT ? true : false,
3696 bcc_ptr);
3697 else
3698 #endif /* CIFS_WEAK_PW_HASH */
3699 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3700 bcc_ptr, nls_codepage);
3701
3702 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3703 if (ses->capabilities & CAP_UNICODE) {
3704 /* must align unicode strings */
3705 *bcc_ptr = 0; /* null byte password */
3706 bcc_ptr++;
3707 }
3708 }
3709
3710 if (ses->server->sec_mode &
3711 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3712 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3713
3714 if (ses->capabilities & CAP_STATUS32) {
3715 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3716 }
3717 if (ses->capabilities & CAP_DFS) {
3718 smb_buffer->Flags2 |= SMBFLG2_DFS;
3719 }
3720 if (ses->capabilities & CAP_UNICODE) {
3721 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3722 length =
3723 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3724 6 /* max utf8 char length in bytes */ *
3725 (/* server len*/ + 256 /* share len */), nls_codepage);
3726 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3727 bcc_ptr += 2; /* skip trailing null */
3728 } else { /* ASCII */
3729 strcpy(bcc_ptr, tree);
3730 bcc_ptr += strlen(tree) + 1;
3731 }
3732 strcpy(bcc_ptr, "?????");
3733 bcc_ptr += strlen("?????");
3734 bcc_ptr += 1;
3735 count = bcc_ptr - &pSMB->Password[0];
3736 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3737 pSMB->hdr.smb_buf_length) + count);
3738 pSMB->ByteCount = cpu_to_le16(count);
3739
3740 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3741 0);
3742
3743 /* above now done in SendReceive */
3744 if ((rc == 0) && (tcon != NULL)) {
3745 bool is_unicode;
3746
3747 tcon->tidStatus = CifsGood;
3748 tcon->need_reconnect = false;
3749 tcon->tid = smb_buffer_response->Tid;
3750 bcc_ptr = pByteArea(smb_buffer_response);
3751 bytes_left = get_bcc(smb_buffer_response);
3752 length = strnlen(bcc_ptr, bytes_left - 2);
3753 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3754 is_unicode = true;
3755 else
3756 is_unicode = false;
3757
3758
3759 /* skip service field (NB: this field is always ASCII) */
3760 if (length == 3) {
3761 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3762 (bcc_ptr[2] == 'C')) {
3763 cFYI(1, "IPC connection");
3764 tcon->ipc = 1;
3765 }
3766 } else if (length == 2) {
3767 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3768 /* the most common case */
3769 cFYI(1, "disk share connection");
3770 }
3771 }
3772 bcc_ptr += length + 1;
3773 bytes_left -= (length + 1);
3774 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3775
3776 /* mostly informational -- no need to fail on error here */
3777 kfree(tcon->nativeFileSystem);
3778 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3779 bytes_left, is_unicode,
3780 nls_codepage);
3781
3782 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3783
3784 if ((smb_buffer_response->WordCount == 3) ||
3785 (smb_buffer_response->WordCount == 7))
3786 /* field is in same location */
3787 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3788 else
3789 tcon->Flags = 0;
3790 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3791 } else if ((rc == 0) && tcon == NULL) {
3792 /* all we need to save for IPC$ connection */
3793 ses->ipc_tid = smb_buffer_response->Tid;
3794 }
3795
3796 cifs_buf_release(smb_buffer);
3797 return rc;
3798 }
3799
3800 void
3801 cifs_umount(struct cifs_sb_info *cifs_sb)
3802 {
3803 struct rb_root *root = &cifs_sb->tlink_tree;
3804 struct rb_node *node;
3805 struct tcon_link *tlink;
3806
3807 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3808
3809 spin_lock(&cifs_sb->tlink_tree_lock);
3810 while ((node = rb_first(root))) {
3811 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3812 cifs_get_tlink(tlink);
3813 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3814 rb_erase(node, root);
3815
3816 spin_unlock(&cifs_sb->tlink_tree_lock);
3817 cifs_put_tlink(tlink);
3818 spin_lock(&cifs_sb->tlink_tree_lock);
3819 }
3820 spin_unlock(&cifs_sb->tlink_tree_lock);
3821
3822 bdi_destroy(&cifs_sb->bdi);
3823 kfree(cifs_sb->mountdata);
3824 unload_nls(cifs_sb->local_nls);
3825 kfree(cifs_sb);
3826 }
3827
3828 int
3829 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3830 {
3831 int rc = 0;
3832 struct TCP_Server_Info *server = ses->server;
3833
3834 if (!server->ops->need_neg || !server->ops->negotiate)
3835 return -ENOSYS;
3836
3837 /* only send once per connect */
3838 if (!server->ops->need_neg(server))
3839 return 0;
3840
3841 set_credits(server, 1);
3842
3843 rc = server->ops->negotiate(xid, ses);
3844 if (rc == 0) {
3845 spin_lock(&GlobalMid_Lock);
3846 if (server->tcpStatus == CifsNeedNegotiate)
3847 server->tcpStatus = CifsGood;
3848 else
3849 rc = -EHOSTDOWN;
3850 spin_unlock(&GlobalMid_Lock);
3851 }
3852
3853 return rc;
3854 }
3855
3856 int
3857 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3858 struct nls_table *nls_info)
3859 {
3860 int rc = -ENOSYS;
3861 struct TCP_Server_Info *server = ses->server;
3862
3863 ses->flags = 0;
3864 ses->capabilities = server->capabilities;
3865 if (linuxExtEnabled == 0)
3866 ses->capabilities &= (~server->vals->cap_unix);
3867
3868 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3869 server->sec_mode, server->capabilities, server->timeAdj);
3870
3871 if (server->ops->sess_setup)
3872 rc = server->ops->sess_setup(xid, ses, nls_info);
3873
3874 if (rc) {
3875 cERROR(1, "Send error in SessSetup = %d", rc);
3876 } else {
3877 mutex_lock(&ses->server->srv_mutex);
3878 if (!server->session_estab) {
3879 server->session_key.response = ses->auth_key.response;
3880 server->session_key.len = ses->auth_key.len;
3881 server->sequence_number = 0x2;
3882 server->session_estab = true;
3883 ses->auth_key.response = NULL;
3884 }
3885 mutex_unlock(&server->srv_mutex);
3886
3887 cFYI(1, "CIFS Session Established successfully");
3888 spin_lock(&GlobalMid_Lock);
3889 ses->status = CifsGood;
3890 ses->need_reconnect = false;
3891 spin_unlock(&GlobalMid_Lock);
3892 }
3893
3894 kfree(ses->auth_key.response);
3895 ses->auth_key.response = NULL;
3896 ses->auth_key.len = 0;
3897 kfree(ses->ntlmssp);
3898 ses->ntlmssp = NULL;
3899
3900 return rc;
3901 }
3902
3903 static int
3904 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3905 {
3906 switch (ses->server->secType) {
3907 case Kerberos:
3908 vol->secFlg = CIFSSEC_MUST_KRB5;
3909 return 0;
3910 case NTLMv2:
3911 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3912 break;
3913 case NTLM:
3914 vol->secFlg = CIFSSEC_MUST_NTLM;
3915 break;
3916 case RawNTLMSSP:
3917 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3918 break;
3919 case LANMAN:
3920 vol->secFlg = CIFSSEC_MUST_LANMAN;
3921 break;
3922 }
3923
3924 return cifs_set_cifscreds(vol, ses);
3925 }
3926
3927 static struct cifs_tcon *
3928 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3929 {
3930 int rc;
3931 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3932 struct cifs_ses *ses;
3933 struct cifs_tcon *tcon = NULL;
3934 struct smb_vol *vol_info;
3935
3936 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3937 if (vol_info == NULL)
3938 return ERR_PTR(-ENOMEM);
3939
3940 vol_info->local_nls = cifs_sb->local_nls;
3941 vol_info->linux_uid = fsuid;
3942 vol_info->cred_uid = fsuid;
3943 vol_info->UNC = master_tcon->treeName;
3944 vol_info->retry = master_tcon->retry;
3945 vol_info->nocase = master_tcon->nocase;
3946 vol_info->local_lease = master_tcon->local_lease;
3947 vol_info->no_linux_ext = !master_tcon->unix_ext;
3948
3949 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3950 if (rc) {
3951 tcon = ERR_PTR(rc);
3952 goto out;
3953 }
3954
3955 /* get a reference for the same TCP session */
3956 spin_lock(&cifs_tcp_ses_lock);
3957 ++master_tcon->ses->server->srv_count;
3958 spin_unlock(&cifs_tcp_ses_lock);
3959
3960 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3961 if (IS_ERR(ses)) {
3962 tcon = (struct cifs_tcon *)ses;
3963 cifs_put_tcp_session(master_tcon->ses->server);
3964 goto out;
3965 }
3966
3967 tcon = cifs_get_tcon(ses, vol_info);
3968 if (IS_ERR(tcon)) {
3969 cifs_put_smb_ses(ses);
3970 goto out;
3971 }
3972
3973 if (cap_unix(ses))
3974 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3975 out:
3976 kfree(vol_info->username);
3977 kfree(vol_info->password);
3978 kfree(vol_info);
3979
3980 return tcon;
3981 }
3982
3983 struct cifs_tcon *
3984 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3985 {
3986 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3987 }
3988
3989 static int
3990 cifs_sb_tcon_pending_wait(void *unused)
3991 {
3992 schedule();
3993 return signal_pending(current) ? -ERESTARTSYS : 0;
3994 }
3995
3996 /* find and return a tlink with given uid */
3997 static struct tcon_link *
3998 tlink_rb_search(struct rb_root *root, uid_t uid)
3999 {
4000 struct rb_node *node = root->rb_node;
4001 struct tcon_link *tlink;
4002
4003 while (node) {
4004 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4005
4006 if (tlink->tl_uid > uid)
4007 node = node->rb_left;
4008 else if (tlink->tl_uid < uid)
4009 node = node->rb_right;
4010 else
4011 return tlink;
4012 }
4013 return NULL;
4014 }
4015
4016 /* insert a tcon_link into the tree */
4017 static void
4018 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4019 {
4020 struct rb_node **new = &(root->rb_node), *parent = NULL;
4021 struct tcon_link *tlink;
4022
4023 while (*new) {
4024 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4025 parent = *new;
4026
4027 if (tlink->tl_uid > new_tlink->tl_uid)
4028 new = &((*new)->rb_left);
4029 else
4030 new = &((*new)->rb_right);
4031 }
4032
4033 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4034 rb_insert_color(&new_tlink->tl_rbnode, root);
4035 }
4036
4037 /*
4038 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4039 * current task.
4040 *
4041 * If the superblock doesn't refer to a multiuser mount, then just return
4042 * the master tcon for the mount.
4043 *
4044 * First, search the rbtree for an existing tcon for this fsuid. If one
4045 * exists, then check to see if it's pending construction. If it is then wait
4046 * for construction to complete. Once it's no longer pending, check to see if
4047 * it failed and either return an error or retry construction, depending on
4048 * the timeout.
4049 *
4050 * If one doesn't exist then insert a new tcon_link struct into the tree and
4051 * try to construct a new one.
4052 */
4053 struct tcon_link *
4054 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4055 {
4056 int ret;
4057 uid_t fsuid = current_fsuid();
4058 struct tcon_link *tlink, *newtlink;
4059
4060 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4061 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4062
4063 spin_lock(&cifs_sb->tlink_tree_lock);
4064 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4065 if (tlink)
4066 cifs_get_tlink(tlink);
4067 spin_unlock(&cifs_sb->tlink_tree_lock);
4068
4069 if (tlink == NULL) {
4070 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4071 if (newtlink == NULL)
4072 return ERR_PTR(-ENOMEM);
4073 newtlink->tl_uid = fsuid;
4074 newtlink->tl_tcon = ERR_PTR(-EACCES);
4075 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4076 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4077 cifs_get_tlink(newtlink);
4078
4079 spin_lock(&cifs_sb->tlink_tree_lock);
4080 /* was one inserted after previous search? */
4081 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4082 if (tlink) {
4083 cifs_get_tlink(tlink);
4084 spin_unlock(&cifs_sb->tlink_tree_lock);
4085 kfree(newtlink);
4086 goto wait_for_construction;
4087 }
4088 tlink = newtlink;
4089 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4090 spin_unlock(&cifs_sb->tlink_tree_lock);
4091 } else {
4092 wait_for_construction:
4093 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4094 cifs_sb_tcon_pending_wait,
4095 TASK_INTERRUPTIBLE);
4096 if (ret) {
4097 cifs_put_tlink(tlink);
4098 return ERR_PTR(ret);
4099 }
4100
4101 /* if it's good, return it */
4102 if (!IS_ERR(tlink->tl_tcon))
4103 return tlink;
4104
4105 /* return error if we tried this already recently */
4106 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4107 cifs_put_tlink(tlink);
4108 return ERR_PTR(-EACCES);
4109 }
4110
4111 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4112 goto wait_for_construction;
4113 }
4114
4115 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4116 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4117 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4118
4119 if (IS_ERR(tlink->tl_tcon)) {
4120 cifs_put_tlink(tlink);
4121 return ERR_PTR(-EACCES);
4122 }
4123
4124 return tlink;
4125 }
4126
4127 /*
4128 * periodic workqueue job that scans tcon_tree for a superblock and closes
4129 * out tcons.
4130 */
4131 static void
4132 cifs_prune_tlinks(struct work_struct *work)
4133 {
4134 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4135 prune_tlinks.work);
4136 struct rb_root *root = &cifs_sb->tlink_tree;
4137 struct rb_node *node = rb_first(root);
4138 struct rb_node *tmp;
4139 struct tcon_link *tlink;
4140
4141 /*
4142 * Because we drop the spinlock in the loop in order to put the tlink
4143 * it's not guarded against removal of links from the tree. The only
4144 * places that remove entries from the tree are this function and
4145 * umounts. Because this function is non-reentrant and is canceled
4146 * before umount can proceed, this is safe.
4147 */
4148 spin_lock(&cifs_sb->tlink_tree_lock);
4149 node = rb_first(root);
4150 while (node != NULL) {
4151 tmp = node;
4152 node = rb_next(tmp);
4153 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4154
4155 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4156 atomic_read(&tlink->tl_count) != 0 ||
4157 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4158 continue;
4159
4160 cifs_get_tlink(tlink);
4161 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4162 rb_erase(tmp, root);
4163
4164 spin_unlock(&cifs_sb->tlink_tree_lock);
4165 cifs_put_tlink(tlink);
4166 spin_lock(&cifs_sb->tlink_tree_lock);
4167 }
4168 spin_unlock(&cifs_sb->tlink_tree_lock);
4169
4170 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4171 TLINK_IDLE_EXPIRE);
4172 }
Linux kernel - Deliverables
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