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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.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_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapchars, Opt_nomapchars, Opt_sfu,
74 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
75 Opt_noposixpaths, Opt_nounix,
76 Opt_nocase,
77 Opt_brl, Opt_nobrl,
78 Opt_forcemandatorylock, Opt_setuids,
79 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
80 Opt_nohard, Opt_nosoft,
81 Opt_nointr, Opt_intr,
82 Opt_nostrictsync, Opt_strictsync,
83 Opt_serverino, Opt_noserverino,
84 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
85 Opt_acl, Opt_noacl, Opt_locallease,
86 Opt_sign, Opt_seal, 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,
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_forcegid, "forcegid" },
122 { Opt_noforcegid, "noforcegid" },
123 { Opt_noblocksend, "noblocksend" },
124 { Opt_noautotune, "noautotune" },
125 { Opt_hard, "hard" },
126 { Opt_soft, "soft" },
127 { Opt_perm, "perm" },
128 { Opt_noperm, "noperm" },
129 { Opt_mapchars, "mapchars" },
130 { Opt_nomapchars, "nomapchars" },
131 { Opt_sfu, "sfu" },
132 { Opt_nosfu, "nosfu" },
133 { Opt_nodfs, "nodfs" },
134 { Opt_posixpaths, "posixpaths" },
135 { Opt_noposixpaths, "noposixpaths" },
136 { Opt_nounix, "nounix" },
137 { Opt_nounix, "nolinux" },
138 { Opt_nocase, "nocase" },
139 { Opt_nocase, "ignorecase" },
140 { Opt_brl, "brl" },
141 { Opt_nobrl, "nobrl" },
142 { Opt_nobrl, "nolock" },
143 { Opt_forcemandatorylock, "forcemandatorylock" },
144 { Opt_forcemandatorylock, "forcemand" },
145 { Opt_setuids, "setuids" },
146 { Opt_nosetuids, "nosetuids" },
147 { Opt_dynperm, "dynperm" },
148 { Opt_nodynperm, "nodynperm" },
149 { Opt_nohard, "nohard" },
150 { Opt_nosoft, "nosoft" },
151 { Opt_nointr, "nointr" },
152 { Opt_intr, "intr" },
153 { Opt_nostrictsync, "nostrictsync" },
154 { Opt_strictsync, "strictsync" },
155 { Opt_serverino, "serverino" },
156 { Opt_noserverino, "noserverino" },
157 { Opt_rwpidforward, "rwpidforward" },
158 { Opt_cifsacl, "cifsacl" },
159 { Opt_nocifsacl, "nocifsacl" },
160 { Opt_acl, "acl" },
161 { Opt_noacl, "noacl" },
162 { Opt_locallease, "locallease" },
163 { Opt_sign, "sign" },
164 { Opt_seal, "seal" },
165 { Opt_noac, "noac" },
166 { Opt_fsc, "fsc" },
167 { Opt_mfsymlinks, "mfsymlinks" },
168 { Opt_multiuser, "multiuser" },
169 { Opt_sloppy, "sloppy" },
170
171 { Opt_backupuid, "backupuid=%s" },
172 { Opt_backupgid, "backupgid=%s" },
173 { Opt_uid, "uid=%s" },
174 { Opt_cruid, "cruid=%s" },
175 { Opt_gid, "gid=%s" },
176 { Opt_file_mode, "file_mode=%s" },
177 { Opt_dirmode, "dirmode=%s" },
178 { Opt_dirmode, "dir_mode=%s" },
179 { Opt_port, "port=%s" },
180 { Opt_rsize, "rsize=%s" },
181 { Opt_wsize, "wsize=%s" },
182 { Opt_actimeo, "actimeo=%s" },
183
184 { Opt_blank_user, "user=" },
185 { Opt_blank_user, "username=" },
186 { Opt_user, "user=%s" },
187 { Opt_user, "username=%s" },
188 { Opt_blank_pass, "pass=" },
189 { Opt_blank_pass, "password=" },
190 { Opt_pass, "pass=%s" },
191 { Opt_pass, "password=%s" },
192 { Opt_blank_ip, "ip=" },
193 { Opt_blank_ip, "addr=" },
194 { Opt_ip, "ip=%s" },
195 { Opt_ip, "addr=%s" },
196 { Opt_unc, "unc=%s" },
197 { Opt_unc, "target=%s" },
198 { Opt_unc, "path=%s" },
199 { Opt_domain, "dom=%s" },
200 { Opt_domain, "domain=%s" },
201 { Opt_domain, "workgroup=%s" },
202 { Opt_srcaddr, "srcaddr=%s" },
203 { Opt_prefixpath, "prefixpath=%s" },
204 { Opt_iocharset, "iocharset=%s" },
205 { Opt_netbiosname, "netbiosname=%s" },
206 { Opt_servern, "servern=%s" },
207 { Opt_ver, "ver=%s" },
208 { Opt_vers, "vers=%s" },
209 { Opt_sec, "sec=%s" },
210 { Opt_cache, "cache=%s" },
211
212 { Opt_ignore, "cred" },
213 { Opt_ignore, "credentials" },
214 { Opt_ignore, "cred=%s" },
215 { Opt_ignore, "credentials=%s" },
216 { Opt_ignore, "guest" },
217 { Opt_ignore, "rw" },
218 { Opt_ignore, "ro" },
219 { Opt_ignore, "suid" },
220 { Opt_ignore, "nosuid" },
221 { Opt_ignore, "exec" },
222 { Opt_ignore, "noexec" },
223 { Opt_ignore, "nodev" },
224 { Opt_ignore, "noauto" },
225 { Opt_ignore, "dev" },
226 { Opt_ignore, "mand" },
227 { Opt_ignore, "nomand" },
228 { Opt_ignore, "_netdev" },
229
230 { Opt_err, NULL }
231 };
232
233 enum {
234 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
235 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
236 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
237 Opt_sec_ntlmv2i, Opt_sec_lanman,
238 Opt_sec_none,
239
240 Opt_sec_err
241 };
242
243 static const match_table_t cifs_secflavor_tokens = {
244 { Opt_sec_krb5, "krb5" },
245 { Opt_sec_krb5i, "krb5i" },
246 { Opt_sec_krb5p, "krb5p" },
247 { Opt_sec_ntlmsspi, "ntlmsspi" },
248 { Opt_sec_ntlmssp, "ntlmssp" },
249 { Opt_ntlm, "ntlm" },
250 { Opt_sec_ntlmi, "ntlmi" },
251 { Opt_sec_ntlmv2, "nontlm" },
252 { Opt_sec_ntlmv2, "ntlmv2" },
253 { Opt_sec_ntlmv2i, "ntlmv2i" },
254 { Opt_sec_lanman, "lanman" },
255 { Opt_sec_none, "none" },
256
257 { Opt_sec_err, NULL }
258 };
259
260 /* cache flavors */
261 enum {
262 Opt_cache_loose,
263 Opt_cache_strict,
264 Opt_cache_none,
265 Opt_cache_err
266 };
267
268 static const match_table_t cifs_cacheflavor_tokens = {
269 { Opt_cache_loose, "loose" },
270 { Opt_cache_strict, "strict" },
271 { Opt_cache_none, "none" },
272 { Opt_cache_err, NULL }
273 };
274
275 static const match_table_t cifs_smb_version_tokens = {
276 { Smb_1, SMB1_VERSION_STRING },
277 { Smb_20, SMB20_VERSION_STRING},
278 { Smb_21, SMB21_VERSION_STRING },
279 { Smb_30, SMB30_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 static int get_option_uid(substring_t args[], kuid_t *result)
990 {
991 unsigned long value;
992 kuid_t uid;
993 int rc;
994
995 rc = get_option_ul(args, &value);
996 if (rc)
997 return rc;
998
999 uid = make_kuid(current_user_ns(), value);
1000 if (!uid_valid(uid))
1001 return -EINVAL;
1002
1003 *result = uid;
1004 return 0;
1005 }
1006
1007 static int get_option_gid(substring_t args[], kgid_t *result)
1008 {
1009 unsigned long value;
1010 kgid_t gid;
1011 int rc;
1012
1013 rc = get_option_ul(args, &value);
1014 if (rc)
1015 return rc;
1016
1017 gid = make_kgid(current_user_ns(), value);
1018 if (!gid_valid(gid))
1019 return -EINVAL;
1020
1021 *result = gid;
1022 return 0;
1023 }
1024
1025 static int cifs_parse_security_flavors(char *value,
1026 struct smb_vol *vol)
1027 {
1028
1029 substring_t args[MAX_OPT_ARGS];
1030
1031 switch (match_token(value, cifs_secflavor_tokens, args)) {
1032 case Opt_sec_krb5:
1033 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN;
1034 break;
1035 case Opt_sec_krb5i:
1036 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1037 break;
1038 case Opt_sec_krb5p:
1039 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1040 cERROR(1, "Krb5 cifs privacy not supported");
1041 break;
1042 case Opt_sec_ntlmssp:
1043 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1044 break;
1045 case Opt_sec_ntlmsspi:
1046 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1047 break;
1048 case Opt_ntlm:
1049 /* ntlm is default so can be turned off too */
1050 vol->secFlg |= CIFSSEC_MAY_NTLM;
1051 break;
1052 case Opt_sec_ntlmi:
1053 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1054 break;
1055 case Opt_sec_ntlmv2:
1056 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1057 break;
1058 case Opt_sec_ntlmv2i:
1059 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1060 break;
1061 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1062 case Opt_sec_lanman:
1063 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1064 break;
1065 #endif
1066 case Opt_sec_none:
1067 vol->nullauth = 1;
1068 break;
1069 default:
1070 cERROR(1, "bad security option: %s", value);
1071 return 1;
1072 }
1073
1074 return 0;
1075 }
1076
1077 static int
1078 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1079 {
1080 substring_t args[MAX_OPT_ARGS];
1081
1082 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1083 case Opt_cache_loose:
1084 vol->direct_io = false;
1085 vol->strict_io = false;
1086 break;
1087 case Opt_cache_strict:
1088 vol->direct_io = false;
1089 vol->strict_io = true;
1090 break;
1091 case Opt_cache_none:
1092 vol->direct_io = true;
1093 vol->strict_io = false;
1094 break;
1095 default:
1096 cERROR(1, "bad cache= option: %s", value);
1097 return 1;
1098 }
1099 return 0;
1100 }
1101
1102 static int
1103 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1104 {
1105 substring_t args[MAX_OPT_ARGS];
1106
1107 switch (match_token(value, cifs_smb_version_tokens, args)) {
1108 case Smb_1:
1109 vol->ops = &smb1_operations;
1110 vol->vals = &smb1_values;
1111 break;
1112 #ifdef CONFIG_CIFS_SMB2
1113 case Smb_20:
1114 vol->ops = &smb21_operations; /* currently identical with 2.1 */
1115 vol->vals = &smb20_values;
1116 break;
1117 case Smb_21:
1118 vol->ops = &smb21_operations;
1119 vol->vals = &smb21_values;
1120 break;
1121 case Smb_30:
1122 vol->ops = &smb30_operations;
1123 vol->vals = &smb30_values;
1124 break;
1125 #endif
1126 default:
1127 cERROR(1, "Unknown vers= option specified: %s", value);
1128 return 1;
1129 }
1130 return 0;
1131 }
1132
1133 /*
1134 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1135 * fields with the result. Returns 0 on success and an error otherwise.
1136 */
1137 static int
1138 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1139 {
1140 char *pos;
1141 const char *delims = "/\\";
1142 size_t len;
1143
1144 /* make sure we have a valid UNC double delimiter prefix */
1145 len = strspn(devname, delims);
1146 if (len != 2)
1147 return -EINVAL;
1148
1149 /* find delimiter between host and sharename */
1150 pos = strpbrk(devname + 2, delims);
1151 if (!pos)
1152 return -EINVAL;
1153
1154 /* skip past delimiter */
1155 ++pos;
1156
1157 /* now go until next delimiter or end of string */
1158 len = strcspn(pos, delims);
1159
1160 /* move "pos" up to delimiter or NULL */
1161 pos += len;
1162 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1163 if (!vol->UNC)
1164 return -ENOMEM;
1165
1166 convert_delimiter(vol->UNC, '\\');
1167
1168 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1169 if (!*pos++ || !*pos)
1170 return 0;
1171
1172 vol->prepath = kstrdup(pos, GFP_KERNEL);
1173 if (!vol->prepath)
1174 return -ENOMEM;
1175
1176 return 0;
1177 }
1178
1179 static int
1180 cifs_parse_mount_options(const char *mountdata, const char *devname,
1181 struct smb_vol *vol)
1182 {
1183 char *data, *end;
1184 char *mountdata_copy = NULL, *options;
1185 unsigned int temp_len, i, j;
1186 char separator[2];
1187 short int override_uid = -1;
1188 short int override_gid = -1;
1189 bool uid_specified = false;
1190 bool gid_specified = false;
1191 bool sloppy = false;
1192 char *invalid = NULL;
1193 char *nodename = utsname()->nodename;
1194 char *string = NULL;
1195 char *tmp_end, *value;
1196 char delim;
1197 bool got_ip = false;
1198 unsigned short port = 0;
1199 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1200
1201 separator[0] = ',';
1202 separator[1] = 0;
1203 delim = separator[0];
1204
1205 /* ensure we always start with zeroed-out smb_vol */
1206 memset(vol, 0, sizeof(*vol));
1207
1208 /*
1209 * does not have to be perfect mapping since field is
1210 * informational, only used for servers that do not support
1211 * port 445 and it can be overridden at mount time
1212 */
1213 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1214 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1215 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1216
1217 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1218 /* null target name indicates to use *SMBSERVR default called name
1219 if we end up sending RFC1001 session initialize */
1220 vol->target_rfc1001_name[0] = 0;
1221 vol->cred_uid = current_uid();
1222 vol->linux_uid = current_uid();
1223 vol->linux_gid = current_gid();
1224
1225 /* default to only allowing write access to owner of the mount */
1226 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1227
1228 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1229 /* default is always to request posix paths. */
1230 vol->posix_paths = 1;
1231 /* default to using server inode numbers where available */
1232 vol->server_ino = 1;
1233
1234 /* default is to use strict cifs caching semantics */
1235 vol->strict_io = true;
1236
1237 vol->actimeo = CIFS_DEF_ACTIMEO;
1238
1239 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1240 vol->ops = &smb1_operations;
1241 vol->vals = &smb1_values;
1242
1243 if (!mountdata)
1244 goto cifs_parse_mount_err;
1245
1246 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1247 if (!mountdata_copy)
1248 goto cifs_parse_mount_err;
1249
1250 options = mountdata_copy;
1251 end = options + strlen(options);
1252
1253 if (strncmp(options, "sep=", 4) == 0) {
1254 if (options[4] != 0) {
1255 separator[0] = options[4];
1256 options += 5;
1257 } else {
1258 cFYI(1, "Null separator not allowed");
1259 }
1260 }
1261 vol->backupuid_specified = false; /* no backup intent for a user */
1262 vol->backupgid_specified = false; /* no backup intent for a group */
1263
1264 /*
1265 * For now, we ignore -EINVAL errors under the assumption that the
1266 * unc= and prefixpath= options will be usable.
1267 */
1268 if (cifs_parse_devname(devname, vol) == -ENOMEM) {
1269 printk(KERN_ERR "CIFS: Unable to allocate memory to parse "
1270 "device string.\n");
1271 goto out_nomem;
1272 }
1273
1274 while ((data = strsep(&options, separator)) != NULL) {
1275 substring_t args[MAX_OPT_ARGS];
1276 unsigned long option;
1277 int token;
1278
1279 if (!*data)
1280 continue;
1281
1282 token = match_token(data, cifs_mount_option_tokens, args);
1283
1284 switch (token) {
1285
1286 /* Ingnore the following */
1287 case Opt_ignore:
1288 break;
1289
1290 /* Boolean values */
1291 case Opt_user_xattr:
1292 vol->no_xattr = 0;
1293 break;
1294 case Opt_nouser_xattr:
1295 vol->no_xattr = 1;
1296 break;
1297 case Opt_forceuid:
1298 override_uid = 1;
1299 break;
1300 case Opt_noforceuid:
1301 override_uid = 0;
1302 break;
1303 case Opt_forcegid:
1304 override_gid = 1;
1305 break;
1306 case Opt_noforcegid:
1307 override_gid = 0;
1308 break;
1309 case Opt_noblocksend:
1310 vol->noblocksnd = 1;
1311 break;
1312 case Opt_noautotune:
1313 vol->noautotune = 1;
1314 break;
1315 case Opt_hard:
1316 vol->retry = 1;
1317 break;
1318 case Opt_soft:
1319 vol->retry = 0;
1320 break;
1321 case Opt_perm:
1322 vol->noperm = 0;
1323 break;
1324 case Opt_noperm:
1325 vol->noperm = 1;
1326 break;
1327 case Opt_mapchars:
1328 vol->remap = 1;
1329 break;
1330 case Opt_nomapchars:
1331 vol->remap = 0;
1332 break;
1333 case Opt_sfu:
1334 vol->sfu_emul = 1;
1335 break;
1336 case Opt_nosfu:
1337 vol->sfu_emul = 0;
1338 break;
1339 case Opt_nodfs:
1340 vol->nodfs = 1;
1341 break;
1342 case Opt_posixpaths:
1343 vol->posix_paths = 1;
1344 break;
1345 case Opt_noposixpaths:
1346 vol->posix_paths = 0;
1347 break;
1348 case Opt_nounix:
1349 vol->no_linux_ext = 1;
1350 break;
1351 case Opt_nocase:
1352 vol->nocase = 1;
1353 break;
1354 case Opt_brl:
1355 vol->nobrl = 0;
1356 break;
1357 case Opt_nobrl:
1358 vol->nobrl = 1;
1359 /*
1360 * turn off mandatory locking in mode
1361 * if remote locking is turned off since the
1362 * local vfs will do advisory
1363 */
1364 if (vol->file_mode ==
1365 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1366 vol->file_mode = S_IALLUGO;
1367 break;
1368 case Opt_forcemandatorylock:
1369 vol->mand_lock = 1;
1370 break;
1371 case Opt_setuids:
1372 vol->setuids = 1;
1373 break;
1374 case Opt_nosetuids:
1375 vol->setuids = 0;
1376 break;
1377 case Opt_dynperm:
1378 vol->dynperm = true;
1379 break;
1380 case Opt_nodynperm:
1381 vol->dynperm = false;
1382 break;
1383 case Opt_nohard:
1384 vol->retry = 0;
1385 break;
1386 case Opt_nosoft:
1387 vol->retry = 1;
1388 break;
1389 case Opt_nointr:
1390 vol->intr = 0;
1391 break;
1392 case Opt_intr:
1393 vol->intr = 1;
1394 break;
1395 case Opt_nostrictsync:
1396 vol->nostrictsync = 1;
1397 break;
1398 case Opt_strictsync:
1399 vol->nostrictsync = 0;
1400 break;
1401 case Opt_serverino:
1402 vol->server_ino = 1;
1403 break;
1404 case Opt_noserverino:
1405 vol->server_ino = 0;
1406 break;
1407 case Opt_rwpidforward:
1408 vol->rwpidforward = 1;
1409 break;
1410 case Opt_cifsacl:
1411 vol->cifs_acl = 1;
1412 break;
1413 case Opt_nocifsacl:
1414 vol->cifs_acl = 0;
1415 break;
1416 case Opt_acl:
1417 vol->no_psx_acl = 0;
1418 break;
1419 case Opt_noacl:
1420 vol->no_psx_acl = 1;
1421 break;
1422 case Opt_locallease:
1423 vol->local_lease = 1;
1424 break;
1425 case Opt_sign:
1426 vol->secFlg |= CIFSSEC_MUST_SIGN;
1427 break;
1428 case Opt_seal:
1429 /* we do not do the following in secFlags because seal
1430 * is a per tree connection (mount) not a per socket
1431 * or per-smb connection option in the protocol
1432 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1433 */
1434 vol->seal = 1;
1435 break;
1436 case Opt_noac:
1437 printk(KERN_WARNING "CIFS: Mount option noac not "
1438 "supported. Instead set "
1439 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1440 break;
1441 case Opt_fsc:
1442 #ifndef CONFIG_CIFS_FSCACHE
1443 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1444 "kernel config option set");
1445 goto cifs_parse_mount_err;
1446 #endif
1447 vol->fsc = true;
1448 break;
1449 case Opt_mfsymlinks:
1450 vol->mfsymlinks = true;
1451 break;
1452 case Opt_multiuser:
1453 vol->multiuser = true;
1454 break;
1455 case Opt_sloppy:
1456 sloppy = true;
1457 break;
1458
1459 /* Numeric Values */
1460 case Opt_backupuid:
1461 if (get_option_uid(args, &vol->backupuid)) {
1462 cERROR(1, "%s: Invalid backupuid value",
1463 __func__);
1464 goto cifs_parse_mount_err;
1465 }
1466 vol->backupuid_specified = true;
1467 break;
1468 case Opt_backupgid:
1469 if (get_option_gid(args, &vol->backupgid)) {
1470 cERROR(1, "%s: Invalid backupgid value",
1471 __func__);
1472 goto cifs_parse_mount_err;
1473 }
1474 vol->backupgid_specified = true;
1475 break;
1476 case Opt_uid:
1477 if (get_option_uid(args, &vol->linux_uid)) {
1478 cERROR(1, "%s: Invalid uid value",
1479 __func__);
1480 goto cifs_parse_mount_err;
1481 }
1482 uid_specified = true;
1483 break;
1484 case Opt_cruid:
1485 if (get_option_uid(args, &vol->cred_uid)) {
1486 cERROR(1, "%s: Invalid cruid value",
1487 __func__);
1488 goto cifs_parse_mount_err;
1489 }
1490 break;
1491 case Opt_gid:
1492 if (get_option_gid(args, &vol->linux_gid)) {
1493 cERROR(1, "%s: Invalid gid value",
1494 __func__);
1495 goto cifs_parse_mount_err;
1496 }
1497 gid_specified = true;
1498 break;
1499 case Opt_file_mode:
1500 if (get_option_ul(args, &option)) {
1501 cERROR(1, "%s: Invalid file_mode value",
1502 __func__);
1503 goto cifs_parse_mount_err;
1504 }
1505 vol->file_mode = option;
1506 break;
1507 case Opt_dirmode:
1508 if (get_option_ul(args, &option)) {
1509 cERROR(1, "%s: Invalid dir_mode value",
1510 __func__);
1511 goto cifs_parse_mount_err;
1512 }
1513 vol->dir_mode = option;
1514 break;
1515 case Opt_port:
1516 if (get_option_ul(args, &option) ||
1517 option > USHRT_MAX) {
1518 cERROR(1, "%s: Invalid port value", __func__);
1519 goto cifs_parse_mount_err;
1520 }
1521 port = (unsigned short)option;
1522 break;
1523 case Opt_rsize:
1524 if (get_option_ul(args, &option)) {
1525 cERROR(1, "%s: Invalid rsize value",
1526 __func__);
1527 goto cifs_parse_mount_err;
1528 }
1529 vol->rsize = option;
1530 break;
1531 case Opt_wsize:
1532 if (get_option_ul(args, &option)) {
1533 cERROR(1, "%s: Invalid wsize value",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 vol->wsize = option;
1538 break;
1539 case Opt_actimeo:
1540 if (get_option_ul(args, &option)) {
1541 cERROR(1, "%s: Invalid actimeo value",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 vol->actimeo = HZ * option;
1546 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1547 cERROR(1, "CIFS: attribute cache"
1548 "timeout too large");
1549 goto cifs_parse_mount_err;
1550 }
1551 break;
1552
1553 /* String Arguments */
1554
1555 case Opt_blank_user:
1556 /* null user, ie. anonymous authentication */
1557 vol->nullauth = 1;
1558 vol->username = NULL;
1559 break;
1560 case Opt_user:
1561 string = match_strdup(args);
1562 if (string == NULL)
1563 goto out_nomem;
1564
1565 if (strnlen(string, MAX_USERNAME_SIZE) >
1566 MAX_USERNAME_SIZE) {
1567 printk(KERN_WARNING "CIFS: username too long\n");
1568 goto cifs_parse_mount_err;
1569 }
1570 vol->username = kstrdup(string, GFP_KERNEL);
1571 if (!vol->username) {
1572 printk(KERN_WARNING "CIFS: no memory "
1573 "for username\n");
1574 goto cifs_parse_mount_err;
1575 }
1576 break;
1577 case Opt_blank_pass:
1578 /* passwords have to be handled differently
1579 * to allow the character used for deliminator
1580 * to be passed within them
1581 */
1582
1583 /*
1584 * Check if this is a case where the password
1585 * starts with a delimiter
1586 */
1587 tmp_end = strchr(data, '=');
1588 tmp_end++;
1589 if (!(tmp_end < end && tmp_end[1] == delim)) {
1590 /* No it is not. Set the password to NULL */
1591 vol->password = NULL;
1592 break;
1593 }
1594 /* Yes it is. Drop down to Opt_pass below.*/
1595 case Opt_pass:
1596 /* Obtain the value string */
1597 value = strchr(data, '=');
1598 value++;
1599
1600 /* Set tmp_end to end of the string */
1601 tmp_end = (char *) value + strlen(value);
1602
1603 /* Check if following character is the deliminator
1604 * If yes, we have encountered a double deliminator
1605 * reset the NULL character to the deliminator
1606 */
1607 if (tmp_end < end && tmp_end[1] == delim) {
1608 tmp_end[0] = delim;
1609
1610 /* Keep iterating until we get to a single
1611 * deliminator OR the end
1612 */
1613 while ((tmp_end = strchr(tmp_end, delim))
1614 != NULL && (tmp_end[1] == delim)) {
1615 tmp_end = (char *) &tmp_end[2];
1616 }
1617
1618 /* Reset var options to point to next element */
1619 if (tmp_end) {
1620 tmp_end[0] = '\0';
1621 options = (char *) &tmp_end[1];
1622 } else
1623 /* Reached the end of the mount option
1624 * string */
1625 options = end;
1626 }
1627
1628 /* Now build new password string */
1629 temp_len = strlen(value);
1630 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1631 if (vol->password == NULL) {
1632 printk(KERN_WARNING "CIFS: no memory "
1633 "for password\n");
1634 goto cifs_parse_mount_err;
1635 }
1636
1637 for (i = 0, j = 0; i < temp_len; i++, j++) {
1638 vol->password[j] = value[i];
1639 if ((value[i] == delim) &&
1640 value[i+1] == delim)
1641 /* skip the second deliminator */
1642 i++;
1643 }
1644 vol->password[j] = '\0';
1645 break;
1646 case Opt_blank_ip:
1647 /* FIXME: should this be an error instead? */
1648 got_ip = false;
1649 break;
1650 case Opt_ip:
1651 string = match_strdup(args);
1652 if (string == NULL)
1653 goto out_nomem;
1654
1655 if (!cifs_convert_address(dstaddr, string,
1656 strlen(string))) {
1657 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1658 string);
1659 goto cifs_parse_mount_err;
1660 }
1661 got_ip = true;
1662 break;
1663 case Opt_unc:
1664 string = vol->UNC;
1665 vol->UNC = match_strdup(args);
1666 if (vol->UNC == NULL)
1667 goto out_nomem;
1668
1669 convert_delimiter(vol->UNC, '\\');
1670 if (vol->UNC[0] != '\\' || vol->UNC[1] != '\\') {
1671 printk(KERN_ERR "CIFS: UNC Path does not "
1672 "begin with // or \\\\\n");
1673 goto cifs_parse_mount_err;
1674 }
1675
1676 /* Compare old unc= option to new one */
1677 if (!string || strcmp(string, vol->UNC))
1678 printk(KERN_WARNING "CIFS: the value of the "
1679 "unc= mount option does not match the "
1680 "device string. Using the unc= option "
1681 "for now. In 3.10, that option will "
1682 "be ignored and the contents of the "
1683 "device string will be used "
1684 "instead. (%s != %s)\n", string,
1685 vol->UNC);
1686 break;
1687 case Opt_domain:
1688 string = match_strdup(args);
1689 if (string == NULL)
1690 goto out_nomem;
1691
1692 if (strnlen(string, 256) == 256) {
1693 printk(KERN_WARNING "CIFS: domain name too"
1694 " long\n");
1695 goto cifs_parse_mount_err;
1696 }
1697
1698 vol->domainname = kstrdup(string, GFP_KERNEL);
1699 if (!vol->domainname) {
1700 printk(KERN_WARNING "CIFS: no memory "
1701 "for domainname\n");
1702 goto cifs_parse_mount_err;
1703 }
1704 cFYI(1, "Domain name set");
1705 break;
1706 case Opt_srcaddr:
1707 string = match_strdup(args);
1708 if (string == NULL)
1709 goto out_nomem;
1710
1711 if (!cifs_convert_address(
1712 (struct sockaddr *)&vol->srcaddr,
1713 string, strlen(string))) {
1714 printk(KERN_WARNING "CIFS: Could not parse"
1715 " srcaddr: %s\n", string);
1716 goto cifs_parse_mount_err;
1717 }
1718 break;
1719 case Opt_prefixpath:
1720 /* skip over any leading delimiter */
1721 if (*args[0].from == '/' || *args[0].from == '\\')
1722 args[0].from++;
1723
1724 string = vol->prepath;
1725 vol->prepath = match_strdup(args);
1726 if (vol->prepath == NULL)
1727 goto out_nomem;
1728 /* Compare old prefixpath= option to new one */
1729 if (!string || strcmp(string, vol->prepath))
1730 printk(KERN_WARNING "CIFS: the value of the "
1731 "prefixpath= mount option does not "
1732 "match the device string. Using the "
1733 "prefixpath= option for now. In 3.10, "
1734 "that option will be ignored and the "
1735 "contents of the device string will be "
1736 "used instead.(%s != %s)\n", string,
1737 vol->prepath);
1738 break;
1739 case Opt_iocharset:
1740 string = match_strdup(args);
1741 if (string == NULL)
1742 goto out_nomem;
1743
1744 if (strnlen(string, 1024) >= 65) {
1745 printk(KERN_WARNING "CIFS: iocharset name "
1746 "too long.\n");
1747 goto cifs_parse_mount_err;
1748 }
1749
1750 if (strnicmp(string, "default", 7) != 0) {
1751 vol->iocharset = kstrdup(string,
1752 GFP_KERNEL);
1753 if (!vol->iocharset) {
1754 printk(KERN_WARNING "CIFS: no memory"
1755 "for charset\n");
1756 goto cifs_parse_mount_err;
1757 }
1758 }
1759 /* if iocharset not set then load_nls_default
1760 * is used by caller
1761 */
1762 cFYI(1, "iocharset set to %s", string);
1763 break;
1764 case Opt_netbiosname:
1765 string = match_strdup(args);
1766 if (string == NULL)
1767 goto out_nomem;
1768
1769 memset(vol->source_rfc1001_name, 0x20,
1770 RFC1001_NAME_LEN);
1771 /*
1772 * FIXME: are there cases in which a comma can
1773 * be valid in workstation netbios name (and
1774 * need special handling)?
1775 */
1776 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1777 /* don't ucase netbiosname for user */
1778 if (string[i] == 0)
1779 break;
1780 vol->source_rfc1001_name[i] = string[i];
1781 }
1782 /* The string has 16th byte zero still from
1783 * set at top of the function
1784 */
1785 if (i == RFC1001_NAME_LEN && string[i] != 0)
1786 printk(KERN_WARNING "CIFS: netbiosname"
1787 " longer than 15 truncated.\n");
1788
1789 break;
1790 case Opt_servern:
1791 /* servernetbiosname specified override *SMBSERVER */
1792 string = match_strdup(args);
1793 if (string == NULL)
1794 goto out_nomem;
1795
1796 /* last byte, type, is 0x20 for servr type */
1797 memset(vol->target_rfc1001_name, 0x20,
1798 RFC1001_NAME_LEN_WITH_NULL);
1799
1800 /* BB are there cases in which a comma can be
1801 valid in this workstation netbios name
1802 (and need special handling)? */
1803
1804 /* user or mount helper must uppercase the
1805 netbios name */
1806 for (i = 0; i < 15; i++) {
1807 if (string[i] == 0)
1808 break;
1809 vol->target_rfc1001_name[i] = string[i];
1810 }
1811 /* The string has 16th byte zero still from
1812 set at top of the function */
1813 if (i == RFC1001_NAME_LEN && string[i] != 0)
1814 printk(KERN_WARNING "CIFS: server net"
1815 "biosname longer than 15 truncated.\n");
1816 break;
1817 case Opt_ver:
1818 string = match_strdup(args);
1819 if (string == NULL)
1820 goto out_nomem;
1821
1822 if (strnicmp(string, "1", 1) == 0) {
1823 /* This is the default */
1824 break;
1825 }
1826 /* For all other value, error */
1827 printk(KERN_WARNING "CIFS: Invalid version"
1828 " specified\n");
1829 goto cifs_parse_mount_err;
1830 case Opt_vers:
1831 string = match_strdup(args);
1832 if (string == NULL)
1833 goto out_nomem;
1834
1835 if (cifs_parse_smb_version(string, vol) != 0)
1836 goto cifs_parse_mount_err;
1837 break;
1838 case Opt_sec:
1839 string = match_strdup(args);
1840 if (string == NULL)
1841 goto out_nomem;
1842
1843 if (cifs_parse_security_flavors(string, vol) != 0)
1844 goto cifs_parse_mount_err;
1845 break;
1846 case Opt_cache:
1847 string = match_strdup(args);
1848 if (string == NULL)
1849 goto out_nomem;
1850
1851 if (cifs_parse_cache_flavor(string, vol) != 0)
1852 goto cifs_parse_mount_err;
1853 break;
1854 default:
1855 /*
1856 * An option we don't recognize. Save it off for later
1857 * if we haven't already found one
1858 */
1859 if (!invalid)
1860 invalid = data;
1861 break;
1862 }
1863 /* Free up any allocated string */
1864 kfree(string);
1865 string = NULL;
1866 }
1867
1868 if (!sloppy && invalid) {
1869 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1870 goto cifs_parse_mount_err;
1871 }
1872
1873 #ifndef CONFIG_KEYS
1874 /* Muliuser mounts require CONFIG_KEYS support */
1875 if (vol->multiuser) {
1876 cERROR(1, "Multiuser mounts require kernels with "
1877 "CONFIG_KEYS enabled.");
1878 goto cifs_parse_mount_err;
1879 }
1880 #endif
1881 if (!vol->UNC) {
1882 cERROR(1, "CIFS mount error: No usable UNC path provided in "
1883 "device string or in unc= option!");
1884 goto cifs_parse_mount_err;
1885 }
1886
1887 /* make sure UNC has a share name */
1888 if (!strchr(vol->UNC + 3, '\\')) {
1889 cERROR(1, "Malformed UNC. Unable to find share name.");
1890 goto cifs_parse_mount_err;
1891 }
1892
1893 if (!got_ip) {
1894 /* No ip= option specified? Try to get it from UNC */
1895 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1896 strlen(&vol->UNC[2]))) {
1897 printk(KERN_ERR "Unable to determine destination "
1898 "address.\n");
1899 goto cifs_parse_mount_err;
1900 }
1901 }
1902
1903 /* set the port that we got earlier */
1904 cifs_set_port(dstaddr, port);
1905
1906 if (uid_specified)
1907 vol->override_uid = override_uid;
1908 else if (override_uid == 1)
1909 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1910 "specified with no uid= option.\n");
1911
1912 if (gid_specified)
1913 vol->override_gid = override_gid;
1914 else if (override_gid == 1)
1915 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1916 "specified with no gid= option.\n");
1917
1918 kfree(mountdata_copy);
1919 return 0;
1920
1921 out_nomem:
1922 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1923 cifs_parse_mount_err:
1924 kfree(string);
1925 kfree(mountdata_copy);
1926 return 1;
1927 }
1928
1929 /** Returns true if srcaddr isn't specified and rhs isn't
1930 * specified, or if srcaddr is specified and
1931 * matches the IP address of the rhs argument.
1932 */
1933 static bool
1934 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1935 {
1936 switch (srcaddr->sa_family) {
1937 case AF_UNSPEC:
1938 return (rhs->sa_family == AF_UNSPEC);
1939 case AF_INET: {
1940 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1941 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1942 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1943 }
1944 case AF_INET6: {
1945 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1946 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1947 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1948 }
1949 default:
1950 WARN_ON(1);
1951 return false; /* don't expect to be here */
1952 }
1953 }
1954
1955 /*
1956 * If no port is specified in addr structure, we try to match with 445 port
1957 * and if it fails - with 139 ports. It should be called only if address
1958 * families of server and addr are equal.
1959 */
1960 static bool
1961 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1962 {
1963 __be16 port, *sport;
1964
1965 switch (addr->sa_family) {
1966 case AF_INET:
1967 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1968 port = ((struct sockaddr_in *) addr)->sin_port;
1969 break;
1970 case AF_INET6:
1971 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1972 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1973 break;
1974 default:
1975 WARN_ON(1);
1976 return false;
1977 }
1978
1979 if (!port) {
1980 port = htons(CIFS_PORT);
1981 if (port == *sport)
1982 return true;
1983
1984 port = htons(RFC1001_PORT);
1985 }
1986
1987 return port == *sport;
1988 }
1989
1990 static bool
1991 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1992 struct sockaddr *srcaddr)
1993 {
1994 switch (addr->sa_family) {
1995 case AF_INET: {
1996 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1997 struct sockaddr_in *srv_addr4 =
1998 (struct sockaddr_in *)&server->dstaddr;
1999
2000 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2001 return false;
2002 break;
2003 }
2004 case AF_INET6: {
2005 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2006 struct sockaddr_in6 *srv_addr6 =
2007 (struct sockaddr_in6 *)&server->dstaddr;
2008
2009 if (!ipv6_addr_equal(&addr6->sin6_addr,
2010 &srv_addr6->sin6_addr))
2011 return false;
2012 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2013 return false;
2014 break;
2015 }
2016 default:
2017 WARN_ON(1);
2018 return false; /* don't expect to be here */
2019 }
2020
2021 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2022 return false;
2023
2024 return true;
2025 }
2026
2027 static bool
2028 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2029 {
2030 unsigned int secFlags;
2031
2032 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
2033 secFlags = vol->secFlg;
2034 else
2035 secFlags = global_secflags | vol->secFlg;
2036
2037 switch (server->secType) {
2038 case LANMAN:
2039 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
2040 return false;
2041 break;
2042 case NTLMv2:
2043 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
2044 return false;
2045 break;
2046 case NTLM:
2047 if (!(secFlags & CIFSSEC_MAY_NTLM))
2048 return false;
2049 break;
2050 case Kerberos:
2051 if (!(secFlags & CIFSSEC_MAY_KRB5))
2052 return false;
2053 break;
2054 case RawNTLMSSP:
2055 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2056 return false;
2057 break;
2058 default:
2059 /* shouldn't happen */
2060 return false;
2061 }
2062
2063 /* now check if signing mode is acceptable */
2064 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2065 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2066 return false;
2067 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2068 (server->sec_mode &
2069 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2070 return false;
2071
2072 return true;
2073 }
2074
2075 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2076 {
2077 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2078
2079 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2080 return 0;
2081
2082 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2083 return 0;
2084
2085 if (!match_address(server, addr,
2086 (struct sockaddr *)&vol->srcaddr))
2087 return 0;
2088
2089 if (!match_port(server, addr))
2090 return 0;
2091
2092 if (!match_security(server, vol))
2093 return 0;
2094
2095 return 1;
2096 }
2097
2098 static struct TCP_Server_Info *
2099 cifs_find_tcp_session(struct smb_vol *vol)
2100 {
2101 struct TCP_Server_Info *server;
2102
2103 spin_lock(&cifs_tcp_ses_lock);
2104 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2105 if (!match_server(server, vol))
2106 continue;
2107
2108 ++server->srv_count;
2109 spin_unlock(&cifs_tcp_ses_lock);
2110 cFYI(1, "Existing tcp session with server found");
2111 return server;
2112 }
2113 spin_unlock(&cifs_tcp_ses_lock);
2114 return NULL;
2115 }
2116
2117 static void
2118 cifs_put_tcp_session(struct TCP_Server_Info *server)
2119 {
2120 struct task_struct *task;
2121
2122 spin_lock(&cifs_tcp_ses_lock);
2123 if (--server->srv_count > 0) {
2124 spin_unlock(&cifs_tcp_ses_lock);
2125 return;
2126 }
2127
2128 put_net(cifs_net_ns(server));
2129
2130 list_del_init(&server->tcp_ses_list);
2131 spin_unlock(&cifs_tcp_ses_lock);
2132
2133 cancel_delayed_work_sync(&server->echo);
2134
2135 spin_lock(&GlobalMid_Lock);
2136 server->tcpStatus = CifsExiting;
2137 spin_unlock(&GlobalMid_Lock);
2138
2139 cifs_crypto_shash_release(server);
2140 cifs_fscache_release_client_cookie(server);
2141
2142 kfree(server->session_key.response);
2143 server->session_key.response = NULL;
2144 server->session_key.len = 0;
2145
2146 task = xchg(&server->tsk, NULL);
2147 if (task)
2148 force_sig(SIGKILL, task);
2149 }
2150
2151 static struct TCP_Server_Info *
2152 cifs_get_tcp_session(struct smb_vol *volume_info)
2153 {
2154 struct TCP_Server_Info *tcp_ses = NULL;
2155 int rc;
2156
2157 cFYI(1, "UNC: %s", volume_info->UNC);
2158
2159 /* see if we already have a matching tcp_ses */
2160 tcp_ses = cifs_find_tcp_session(volume_info);
2161 if (tcp_ses)
2162 return tcp_ses;
2163
2164 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2165 if (!tcp_ses) {
2166 rc = -ENOMEM;
2167 goto out_err;
2168 }
2169
2170 rc = cifs_crypto_shash_allocate(tcp_ses);
2171 if (rc) {
2172 cERROR(1, "could not setup hash structures rc %d", rc);
2173 goto out_err;
2174 }
2175
2176 tcp_ses->ops = volume_info->ops;
2177 tcp_ses->vals = volume_info->vals;
2178 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2179 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2180 if (IS_ERR(tcp_ses->hostname)) {
2181 rc = PTR_ERR(tcp_ses->hostname);
2182 goto out_err_crypto_release;
2183 }
2184
2185 tcp_ses->noblocksnd = volume_info->noblocksnd;
2186 tcp_ses->noautotune = volume_info->noautotune;
2187 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2188 tcp_ses->in_flight = 0;
2189 tcp_ses->credits = 1;
2190 init_waitqueue_head(&tcp_ses->response_q);
2191 init_waitqueue_head(&tcp_ses->request_q);
2192 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2193 mutex_init(&tcp_ses->srv_mutex);
2194 memcpy(tcp_ses->workstation_RFC1001_name,
2195 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2196 memcpy(tcp_ses->server_RFC1001_name,
2197 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2198 tcp_ses->session_estab = false;
2199 tcp_ses->sequence_number = 0;
2200 tcp_ses->lstrp = jiffies;
2201 spin_lock_init(&tcp_ses->req_lock);
2202 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2203 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2204 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2205 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2206 sizeof(tcp_ses->srcaddr));
2207 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2208 sizeof(tcp_ses->dstaddr));
2209 /*
2210 * at this point we are the only ones with the pointer
2211 * to the struct since the kernel thread not created yet
2212 * no need to spinlock this init of tcpStatus or srv_count
2213 */
2214 tcp_ses->tcpStatus = CifsNew;
2215 ++tcp_ses->srv_count;
2216
2217 rc = ip_connect(tcp_ses);
2218 if (rc < 0) {
2219 cERROR(1, "Error connecting to socket. Aborting operation");
2220 goto out_err_crypto_release;
2221 }
2222
2223 /*
2224 * since we're in a cifs function already, we know that
2225 * this will succeed. No need for try_module_get().
2226 */
2227 __module_get(THIS_MODULE);
2228 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2229 tcp_ses, "cifsd");
2230 if (IS_ERR(tcp_ses->tsk)) {
2231 rc = PTR_ERR(tcp_ses->tsk);
2232 cERROR(1, "error %d create cifsd thread", rc);
2233 module_put(THIS_MODULE);
2234 goto out_err_crypto_release;
2235 }
2236 tcp_ses->tcpStatus = CifsNeedNegotiate;
2237
2238 /* thread spawned, put it on the list */
2239 spin_lock(&cifs_tcp_ses_lock);
2240 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2241 spin_unlock(&cifs_tcp_ses_lock);
2242
2243 cifs_fscache_get_client_cookie(tcp_ses);
2244
2245 /* queue echo request delayed work */
2246 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2247
2248 return tcp_ses;
2249
2250 out_err_crypto_release:
2251 cifs_crypto_shash_release(tcp_ses);
2252
2253 put_net(cifs_net_ns(tcp_ses));
2254
2255 out_err:
2256 if (tcp_ses) {
2257 if (!IS_ERR(tcp_ses->hostname))
2258 kfree(tcp_ses->hostname);
2259 if (tcp_ses->ssocket)
2260 sock_release(tcp_ses->ssocket);
2261 kfree(tcp_ses);
2262 }
2263 return ERR_PTR(rc);
2264 }
2265
2266 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2267 {
2268 switch (ses->server->secType) {
2269 case Kerberos:
2270 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2271 return 0;
2272 break;
2273 default:
2274 /* NULL username means anonymous session */
2275 if (ses->user_name == NULL) {
2276 if (!vol->nullauth)
2277 return 0;
2278 break;
2279 }
2280
2281 /* anything else takes username/password */
2282 if (strncmp(ses->user_name,
2283 vol->username ? vol->username : "",
2284 MAX_USERNAME_SIZE))
2285 return 0;
2286 if (strlen(vol->username) != 0 &&
2287 ses->password != NULL &&
2288 strncmp(ses->password,
2289 vol->password ? vol->password : "",
2290 MAX_PASSWORD_SIZE))
2291 return 0;
2292 }
2293 return 1;
2294 }
2295
2296 static struct cifs_ses *
2297 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2298 {
2299 struct cifs_ses *ses;
2300
2301 spin_lock(&cifs_tcp_ses_lock);
2302 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2303 if (!match_session(ses, vol))
2304 continue;
2305 ++ses->ses_count;
2306 spin_unlock(&cifs_tcp_ses_lock);
2307 return ses;
2308 }
2309 spin_unlock(&cifs_tcp_ses_lock);
2310 return NULL;
2311 }
2312
2313 static void
2314 cifs_put_smb_ses(struct cifs_ses *ses)
2315 {
2316 unsigned int xid;
2317 struct TCP_Server_Info *server = ses->server;
2318
2319 cFYI(1, "%s: ses_count=%d", __func__, ses->ses_count);
2320 spin_lock(&cifs_tcp_ses_lock);
2321 if (--ses->ses_count > 0) {
2322 spin_unlock(&cifs_tcp_ses_lock);
2323 return;
2324 }
2325
2326 list_del_init(&ses->smb_ses_list);
2327 spin_unlock(&cifs_tcp_ses_lock);
2328
2329 if (ses->status == CifsGood && server->ops->logoff) {
2330 xid = get_xid();
2331 server->ops->logoff(xid, ses);
2332 _free_xid(xid);
2333 }
2334 sesInfoFree(ses);
2335 cifs_put_tcp_session(server);
2336 }
2337
2338 #ifdef CONFIG_KEYS
2339
2340 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2341 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2342
2343 /* Populate username and pw fields from keyring if possible */
2344 static int
2345 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2346 {
2347 int rc = 0;
2348 char *desc, *delim, *payload;
2349 ssize_t len;
2350 struct key *key;
2351 struct TCP_Server_Info *server = ses->server;
2352 struct sockaddr_in *sa;
2353 struct sockaddr_in6 *sa6;
2354 struct user_key_payload *upayload;
2355
2356 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2357 if (!desc)
2358 return -ENOMEM;
2359
2360 /* try to find an address key first */
2361 switch (server->dstaddr.ss_family) {
2362 case AF_INET:
2363 sa = (struct sockaddr_in *)&server->dstaddr;
2364 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2365 break;
2366 case AF_INET6:
2367 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2368 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2369 break;
2370 default:
2371 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2372 rc = -EINVAL;
2373 goto out_err;
2374 }
2375
2376 cFYI(1, "%s: desc=%s", __func__, desc);
2377 key = request_key(&key_type_logon, desc, "");
2378 if (IS_ERR(key)) {
2379 if (!ses->domainName) {
2380 cFYI(1, "domainName is NULL");
2381 rc = PTR_ERR(key);
2382 goto out_err;
2383 }
2384
2385 /* didn't work, try to find a domain key */
2386 sprintf(desc, "cifs:d:%s", ses->domainName);
2387 cFYI(1, "%s: desc=%s", __func__, desc);
2388 key = request_key(&key_type_logon, desc, "");
2389 if (IS_ERR(key)) {
2390 rc = PTR_ERR(key);
2391 goto out_err;
2392 }
2393 }
2394
2395 down_read(&key->sem);
2396 upayload = key->payload.data;
2397 if (IS_ERR_OR_NULL(upayload)) {
2398 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2399 goto out_key_put;
2400 }
2401
2402 /* find first : in payload */
2403 payload = (char *)upayload->data;
2404 delim = strnchr(payload, upayload->datalen, ':');
2405 cFYI(1, "payload=%s", payload);
2406 if (!delim) {
2407 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2408 upayload->datalen);
2409 rc = -EINVAL;
2410 goto out_key_put;
2411 }
2412
2413 len = delim - payload;
2414 if (len > MAX_USERNAME_SIZE || len <= 0) {
2415 cFYI(1, "Bad value from username search (len=%zd)", len);
2416 rc = -EINVAL;
2417 goto out_key_put;
2418 }
2419
2420 vol->username = kstrndup(payload, len, GFP_KERNEL);
2421 if (!vol->username) {
2422 cFYI(1, "Unable to allocate %zd bytes for username", len);
2423 rc = -ENOMEM;
2424 goto out_key_put;
2425 }
2426 cFYI(1, "%s: username=%s", __func__, vol->username);
2427
2428 len = key->datalen - (len + 1);
2429 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2430 cFYI(1, "Bad len for password search (len=%zd)", len);
2431 rc = -EINVAL;
2432 kfree(vol->username);
2433 vol->username = NULL;
2434 goto out_key_put;
2435 }
2436
2437 ++delim;
2438 vol->password = kstrndup(delim, len, GFP_KERNEL);
2439 if (!vol->password) {
2440 cFYI(1, "Unable to allocate %zd bytes for password", len);
2441 rc = -ENOMEM;
2442 kfree(vol->username);
2443 vol->username = NULL;
2444 goto out_key_put;
2445 }
2446
2447 out_key_put:
2448 up_read(&key->sem);
2449 key_put(key);
2450 out_err:
2451 kfree(desc);
2452 cFYI(1, "%s: returning %d", __func__, rc);
2453 return rc;
2454 }
2455 #else /* ! CONFIG_KEYS */
2456 static inline int
2457 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2458 struct cifs_ses *ses __attribute__((unused)))
2459 {
2460 return -ENOSYS;
2461 }
2462 #endif /* CONFIG_KEYS */
2463
2464 static struct cifs_ses *
2465 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2466 {
2467 int rc = -ENOMEM;
2468 unsigned int xid;
2469 struct cifs_ses *ses;
2470 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2471 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2472
2473 xid = get_xid();
2474
2475 ses = cifs_find_smb_ses(server, volume_info);
2476 if (ses) {
2477 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2478
2479 mutex_lock(&ses->session_mutex);
2480 rc = cifs_negotiate_protocol(xid, ses);
2481 if (rc) {
2482 mutex_unlock(&ses->session_mutex);
2483 /* problem -- put our ses reference */
2484 cifs_put_smb_ses(ses);
2485 free_xid(xid);
2486 return ERR_PTR(rc);
2487 }
2488 if (ses->need_reconnect) {
2489 cFYI(1, "Session needs reconnect");
2490 rc = cifs_setup_session(xid, ses,
2491 volume_info->local_nls);
2492 if (rc) {
2493 mutex_unlock(&ses->session_mutex);
2494 /* problem -- put our reference */
2495 cifs_put_smb_ses(ses);
2496 free_xid(xid);
2497 return ERR_PTR(rc);
2498 }
2499 }
2500 mutex_unlock(&ses->session_mutex);
2501
2502 /* existing SMB ses has a server reference already */
2503 cifs_put_tcp_session(server);
2504 free_xid(xid);
2505 return ses;
2506 }
2507
2508 cFYI(1, "Existing smb sess not found");
2509 ses = sesInfoAlloc();
2510 if (ses == NULL)
2511 goto get_ses_fail;
2512
2513 /* new SMB session uses our server ref */
2514 ses->server = server;
2515 if (server->dstaddr.ss_family == AF_INET6)
2516 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2517 else
2518 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2519
2520 if (volume_info->username) {
2521 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2522 if (!ses->user_name)
2523 goto get_ses_fail;
2524 }
2525
2526 /* volume_info->password freed at unmount */
2527 if (volume_info->password) {
2528 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2529 if (!ses->password)
2530 goto get_ses_fail;
2531 }
2532 if (volume_info->domainname) {
2533 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2534 if (!ses->domainName)
2535 goto get_ses_fail;
2536 }
2537 ses->cred_uid = volume_info->cred_uid;
2538 ses->linux_uid = volume_info->linux_uid;
2539
2540 ses->overrideSecFlg = volume_info->secFlg;
2541
2542 mutex_lock(&ses->session_mutex);
2543 rc = cifs_negotiate_protocol(xid, ses);
2544 if (!rc)
2545 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2546 mutex_unlock(&ses->session_mutex);
2547 if (rc)
2548 goto get_ses_fail;
2549
2550 /* success, put it on the list */
2551 spin_lock(&cifs_tcp_ses_lock);
2552 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2553 spin_unlock(&cifs_tcp_ses_lock);
2554
2555 free_xid(xid);
2556 return ses;
2557
2558 get_ses_fail:
2559 sesInfoFree(ses);
2560 free_xid(xid);
2561 return ERR_PTR(rc);
2562 }
2563
2564 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2565 {
2566 if (tcon->tidStatus == CifsExiting)
2567 return 0;
2568 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2569 return 0;
2570 return 1;
2571 }
2572
2573 static struct cifs_tcon *
2574 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2575 {
2576 struct list_head *tmp;
2577 struct cifs_tcon *tcon;
2578
2579 spin_lock(&cifs_tcp_ses_lock);
2580 list_for_each(tmp, &ses->tcon_list) {
2581 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2582 if (!match_tcon(tcon, unc))
2583 continue;
2584 ++tcon->tc_count;
2585 spin_unlock(&cifs_tcp_ses_lock);
2586 return tcon;
2587 }
2588 spin_unlock(&cifs_tcp_ses_lock);
2589 return NULL;
2590 }
2591
2592 static void
2593 cifs_put_tcon(struct cifs_tcon *tcon)
2594 {
2595 unsigned int xid;
2596 struct cifs_ses *ses = tcon->ses;
2597
2598 cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
2599 spin_lock(&cifs_tcp_ses_lock);
2600 if (--tcon->tc_count > 0) {
2601 spin_unlock(&cifs_tcp_ses_lock);
2602 return;
2603 }
2604
2605 list_del_init(&tcon->tcon_list);
2606 spin_unlock(&cifs_tcp_ses_lock);
2607
2608 xid = get_xid();
2609 if (ses->server->ops->tree_disconnect)
2610 ses->server->ops->tree_disconnect(xid, tcon);
2611 _free_xid(xid);
2612
2613 cifs_fscache_release_super_cookie(tcon);
2614 tconInfoFree(tcon);
2615 cifs_put_smb_ses(ses);
2616 }
2617
2618 static struct cifs_tcon *
2619 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2620 {
2621 int rc, xid;
2622 struct cifs_tcon *tcon;
2623
2624 tcon = cifs_find_tcon(ses, volume_info->UNC);
2625 if (tcon) {
2626 cFYI(1, "Found match on UNC path");
2627 /* existing tcon already has a reference */
2628 cifs_put_smb_ses(ses);
2629 if (tcon->seal != volume_info->seal)
2630 cERROR(1, "transport encryption setting "
2631 "conflicts with existing tid");
2632 return tcon;
2633 }
2634
2635 if (!ses->server->ops->tree_connect) {
2636 rc = -ENOSYS;
2637 goto out_fail;
2638 }
2639
2640 tcon = tconInfoAlloc();
2641 if (tcon == NULL) {
2642 rc = -ENOMEM;
2643 goto out_fail;
2644 }
2645
2646 tcon->ses = ses;
2647 if (volume_info->password) {
2648 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2649 if (!tcon->password) {
2650 rc = -ENOMEM;
2651 goto out_fail;
2652 }
2653 }
2654
2655 /*
2656 * BB Do we need to wrap session_mutex around this TCon call and Unix
2657 * SetFS as we do on SessSetup and reconnect?
2658 */
2659 xid = get_xid();
2660 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2661 volume_info->local_nls);
2662 free_xid(xid);
2663 cFYI(1, "Tcon rc = %d", rc);
2664 if (rc)
2665 goto out_fail;
2666
2667 if (volume_info->nodfs) {
2668 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2669 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2670 }
2671 tcon->seal = volume_info->seal;
2672 /*
2673 * We can have only one retry value for a connection to a share so for
2674 * resources mounted more than once to the same server share the last
2675 * value passed in for the retry flag is used.
2676 */
2677 tcon->retry = volume_info->retry;
2678 tcon->nocase = volume_info->nocase;
2679 tcon->local_lease = volume_info->local_lease;
2680 INIT_LIST_HEAD(&tcon->pending_opens);
2681
2682 spin_lock(&cifs_tcp_ses_lock);
2683 list_add(&tcon->tcon_list, &ses->tcon_list);
2684 spin_unlock(&cifs_tcp_ses_lock);
2685
2686 cifs_fscache_get_super_cookie(tcon);
2687
2688 return tcon;
2689
2690 out_fail:
2691 tconInfoFree(tcon);
2692 return ERR_PTR(rc);
2693 }
2694
2695 void
2696 cifs_put_tlink(struct tcon_link *tlink)
2697 {
2698 if (!tlink || IS_ERR(tlink))
2699 return;
2700
2701 if (!atomic_dec_and_test(&tlink->tl_count) ||
2702 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2703 tlink->tl_time = jiffies;
2704 return;
2705 }
2706
2707 if (!IS_ERR(tlink_tcon(tlink)))
2708 cifs_put_tcon(tlink_tcon(tlink));
2709 kfree(tlink);
2710 return;
2711 }
2712
2713 static inline struct tcon_link *
2714 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2715 {
2716 return cifs_sb->master_tlink;
2717 }
2718
2719 static int
2720 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2721 {
2722 struct cifs_sb_info *old = CIFS_SB(sb);
2723 struct cifs_sb_info *new = mnt_data->cifs_sb;
2724
2725 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2726 return 0;
2727
2728 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2729 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2730 return 0;
2731
2732 /*
2733 * We want to share sb only if we don't specify an r/wsize or
2734 * specified r/wsize is greater than or equal to existing one.
2735 */
2736 if (new->wsize && new->wsize < old->wsize)
2737 return 0;
2738
2739 if (new->rsize && new->rsize < old->rsize)
2740 return 0;
2741
2742 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2743 return 0;
2744
2745 if (old->mnt_file_mode != new->mnt_file_mode ||
2746 old->mnt_dir_mode != new->mnt_dir_mode)
2747 return 0;
2748
2749 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2750 return 0;
2751
2752 if (old->actimeo != new->actimeo)
2753 return 0;
2754
2755 return 1;
2756 }
2757
2758 int
2759 cifs_match_super(struct super_block *sb, void *data)
2760 {
2761 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2762 struct smb_vol *volume_info;
2763 struct cifs_sb_info *cifs_sb;
2764 struct TCP_Server_Info *tcp_srv;
2765 struct cifs_ses *ses;
2766 struct cifs_tcon *tcon;
2767 struct tcon_link *tlink;
2768 int rc = 0;
2769
2770 spin_lock(&cifs_tcp_ses_lock);
2771 cifs_sb = CIFS_SB(sb);
2772 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2773 if (IS_ERR(tlink)) {
2774 spin_unlock(&cifs_tcp_ses_lock);
2775 return rc;
2776 }
2777 tcon = tlink_tcon(tlink);
2778 ses = tcon->ses;
2779 tcp_srv = ses->server;
2780
2781 volume_info = mnt_data->vol;
2782
2783 if (!match_server(tcp_srv, volume_info) ||
2784 !match_session(ses, volume_info) ||
2785 !match_tcon(tcon, volume_info->UNC)) {
2786 rc = 0;
2787 goto out;
2788 }
2789
2790 rc = compare_mount_options(sb, mnt_data);
2791 out:
2792 spin_unlock(&cifs_tcp_ses_lock);
2793 cifs_put_tlink(tlink);
2794 return rc;
2795 }
2796
2797 int
2798 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2799 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2800 struct dfs_info3_param **referrals, int remap)
2801 {
2802 char *temp_unc;
2803 int rc = 0;
2804
2805 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2806 return -ENOSYS;
2807
2808 *num_referrals = 0;
2809 *referrals = NULL;
2810
2811 if (ses->ipc_tid == 0) {
2812 temp_unc = kmalloc(2 /* for slashes */ +
2813 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2814 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2815 if (temp_unc == NULL)
2816 return -ENOMEM;
2817 temp_unc[0] = '\\';
2818 temp_unc[1] = '\\';
2819 strcpy(temp_unc + 2, ses->serverName);
2820 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2821 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2822 nls_codepage);
2823 cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
2824 kfree(temp_unc);
2825 }
2826 if (rc == 0)
2827 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2828 referrals, num_referrals,
2829 nls_codepage, remap);
2830 /*
2831 * BB - map targetUNCs to dfs_info3 structures, here or in
2832 * ses->server->ops->get_dfs_refer.
2833 */
2834
2835 return rc;
2836 }
2837
2838 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2839 static struct lock_class_key cifs_key[2];
2840 static struct lock_class_key cifs_slock_key[2];
2841
2842 static inline void
2843 cifs_reclassify_socket4(struct socket *sock)
2844 {
2845 struct sock *sk = sock->sk;
2846 BUG_ON(sock_owned_by_user(sk));
2847 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2848 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2849 }
2850
2851 static inline void
2852 cifs_reclassify_socket6(struct socket *sock)
2853 {
2854 struct sock *sk = sock->sk;
2855 BUG_ON(sock_owned_by_user(sk));
2856 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2857 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2858 }
2859 #else
2860 static inline void
2861 cifs_reclassify_socket4(struct socket *sock)
2862 {
2863 }
2864
2865 static inline void
2866 cifs_reclassify_socket6(struct socket *sock)
2867 {
2868 }
2869 #endif
2870
2871 /* See RFC1001 section 14 on representation of Netbios names */
2872 static void rfc1002mangle(char *target, char *source, unsigned int length)
2873 {
2874 unsigned int i, j;
2875
2876 for (i = 0, j = 0; i < (length); i++) {
2877 /* mask a nibble at a time and encode */
2878 target[j] = 'A' + (0x0F & (source[i] >> 4));
2879 target[j+1] = 'A' + (0x0F & source[i]);
2880 j += 2;
2881 }
2882
2883 }
2884
2885 static int
2886 bind_socket(struct TCP_Server_Info *server)
2887 {
2888 int rc = 0;
2889 if (server->srcaddr.ss_family != AF_UNSPEC) {
2890 /* Bind to the specified local IP address */
2891 struct socket *socket = server->ssocket;
2892 rc = socket->ops->bind(socket,
2893 (struct sockaddr *) &server->srcaddr,
2894 sizeof(server->srcaddr));
2895 if (rc < 0) {
2896 struct sockaddr_in *saddr4;
2897 struct sockaddr_in6 *saddr6;
2898 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2899 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2900 if (saddr6->sin6_family == AF_INET6)
2901 cERROR(1, "cifs: "
2902 "Failed to bind to: %pI6c, error: %d",
2903 &saddr6->sin6_addr, rc);
2904 else
2905 cERROR(1, "cifs: "
2906 "Failed to bind to: %pI4, error: %d",
2907 &saddr4->sin_addr.s_addr, rc);
2908 }
2909 }
2910 return rc;
2911 }
2912
2913 static int
2914 ip_rfc1001_connect(struct TCP_Server_Info *server)
2915 {
2916 int rc = 0;
2917 /*
2918 * some servers require RFC1001 sessinit before sending
2919 * negprot - BB check reconnection in case where second
2920 * sessinit is sent but no second negprot
2921 */
2922 struct rfc1002_session_packet *ses_init_buf;
2923 struct smb_hdr *smb_buf;
2924 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2925 GFP_KERNEL);
2926 if (ses_init_buf) {
2927 ses_init_buf->trailer.session_req.called_len = 32;
2928
2929 if (server->server_RFC1001_name &&
2930 server->server_RFC1001_name[0] != 0)
2931 rfc1002mangle(ses_init_buf->trailer.
2932 session_req.called_name,
2933 server->server_RFC1001_name,
2934 RFC1001_NAME_LEN_WITH_NULL);
2935 else
2936 rfc1002mangle(ses_init_buf->trailer.
2937 session_req.called_name,
2938 DEFAULT_CIFS_CALLED_NAME,
2939 RFC1001_NAME_LEN_WITH_NULL);
2940
2941 ses_init_buf->trailer.session_req.calling_len = 32;
2942
2943 /*
2944 * calling name ends in null (byte 16) from old smb
2945 * convention.
2946 */
2947 if (server->workstation_RFC1001_name &&
2948 server->workstation_RFC1001_name[0] != 0)
2949 rfc1002mangle(ses_init_buf->trailer.
2950 session_req.calling_name,
2951 server->workstation_RFC1001_name,
2952 RFC1001_NAME_LEN_WITH_NULL);
2953 else
2954 rfc1002mangle(ses_init_buf->trailer.
2955 session_req.calling_name,
2956 "LINUX_CIFS_CLNT",
2957 RFC1001_NAME_LEN_WITH_NULL);
2958
2959 ses_init_buf->trailer.session_req.scope1 = 0;
2960 ses_init_buf->trailer.session_req.scope2 = 0;
2961 smb_buf = (struct smb_hdr *)ses_init_buf;
2962
2963 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2964 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2965 rc = smb_send(server, smb_buf, 0x44);
2966 kfree(ses_init_buf);
2967 /*
2968 * RFC1001 layer in at least one server
2969 * requires very short break before negprot
2970 * presumably because not expecting negprot
2971 * to follow so fast. This is a simple
2972 * solution that works without
2973 * complicating the code and causes no
2974 * significant slowing down on mount
2975 * for everyone else
2976 */
2977 usleep_range(1000, 2000);
2978 }
2979 /*
2980 * else the negprot may still work without this
2981 * even though malloc failed
2982 */
2983
2984 return rc;
2985 }
2986
2987 static int
2988 generic_ip_connect(struct TCP_Server_Info *server)
2989 {
2990 int rc = 0;
2991 __be16 sport;
2992 int slen, sfamily;
2993 struct socket *socket = server->ssocket;
2994 struct sockaddr *saddr;
2995
2996 saddr = (struct sockaddr *) &server->dstaddr;
2997
2998 if (server->dstaddr.ss_family == AF_INET6) {
2999 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3000 slen = sizeof(struct sockaddr_in6);
3001 sfamily = AF_INET6;
3002 } else {
3003 sport = ((struct sockaddr_in *) saddr)->sin_port;
3004 slen = sizeof(struct sockaddr_in);
3005 sfamily = AF_INET;
3006 }
3007
3008 if (socket == NULL) {
3009 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3010 IPPROTO_TCP, &socket, 1);
3011 if (rc < 0) {
3012 cERROR(1, "Error %d creating socket", rc);
3013 server->ssocket = NULL;
3014 return rc;
3015 }
3016
3017 /* BB other socket options to set KEEPALIVE, NODELAY? */
3018 cFYI(1, "Socket created");
3019 server->ssocket = socket;
3020 socket->sk->sk_allocation = GFP_NOFS;
3021 if (sfamily == AF_INET6)
3022 cifs_reclassify_socket6(socket);
3023 else
3024 cifs_reclassify_socket4(socket);
3025 }
3026
3027 rc = bind_socket(server);
3028 if (rc < 0)
3029 return rc;
3030
3031 /*
3032 * Eventually check for other socket options to change from
3033 * the default. sock_setsockopt not used because it expects
3034 * user space buffer
3035 */
3036 socket->sk->sk_rcvtimeo = 7 * HZ;
3037 socket->sk->sk_sndtimeo = 5 * HZ;
3038
3039 /* make the bufsizes depend on wsize/rsize and max requests */
3040 if (server->noautotune) {
3041 if (socket->sk->sk_sndbuf < (200 * 1024))
3042 socket->sk->sk_sndbuf = 200 * 1024;
3043 if (socket->sk->sk_rcvbuf < (140 * 1024))
3044 socket->sk->sk_rcvbuf = 140 * 1024;
3045 }
3046
3047 if (server->tcp_nodelay) {
3048 int val = 1;
3049 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3050 (char *)&val, sizeof(val));
3051 if (rc)
3052 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3053 }
3054
3055 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3056 socket->sk->sk_sndbuf,
3057 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3058
3059 rc = socket->ops->connect(socket, saddr, slen, 0);
3060 if (rc < 0) {
3061 cFYI(1, "Error %d connecting to server", rc);
3062 sock_release(socket);
3063 server->ssocket = NULL;
3064 return rc;
3065 }
3066
3067 if (sport == htons(RFC1001_PORT))
3068 rc = ip_rfc1001_connect(server);
3069
3070 return rc;
3071 }
3072
3073 static int
3074 ip_connect(struct TCP_Server_Info *server)
3075 {
3076 __be16 *sport;
3077 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3078 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3079
3080 if (server->dstaddr.ss_family == AF_INET6)
3081 sport = &addr6->sin6_port;
3082 else
3083 sport = &addr->sin_port;
3084
3085 if (*sport == 0) {
3086 int rc;
3087
3088 /* try with 445 port at first */
3089 *sport = htons(CIFS_PORT);
3090
3091 rc = generic_ip_connect(server);
3092 if (rc >= 0)
3093 return rc;
3094
3095 /* if it failed, try with 139 port */
3096 *sport = htons(RFC1001_PORT);
3097 }
3098
3099 return generic_ip_connect(server);
3100 }
3101
3102 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3103 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3104 {
3105 /* if we are reconnecting then should we check to see if
3106 * any requested capabilities changed locally e.g. via
3107 * remount but we can not do much about it here
3108 * if they have (even if we could detect it by the following)
3109 * Perhaps we could add a backpointer to array of sb from tcon
3110 * or if we change to make all sb to same share the same
3111 * sb as NFS - then we only have one backpointer to sb.
3112 * What if we wanted to mount the server share twice once with
3113 * and once without posixacls or posix paths? */
3114 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3115
3116 if (vol_info && vol_info->no_linux_ext) {
3117 tcon->fsUnixInfo.Capability = 0;
3118 tcon->unix_ext = 0; /* Unix Extensions disabled */
3119 cFYI(1, "Linux protocol extensions disabled");
3120 return;
3121 } else if (vol_info)
3122 tcon->unix_ext = 1; /* Unix Extensions supported */
3123
3124 if (tcon->unix_ext == 0) {
3125 cFYI(1, "Unix extensions disabled so not set on reconnect");
3126 return;
3127 }
3128
3129 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3130 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3131 cFYI(1, "unix caps which server supports %lld", cap);
3132 /* check for reconnect case in which we do not
3133 want to change the mount behavior if we can avoid it */
3134 if (vol_info == NULL) {
3135 /* turn off POSIX ACL and PATHNAMES if not set
3136 originally at mount time */
3137 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3138 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3139 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3140 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3141 cERROR(1, "POSIXPATH support change");
3142 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3143 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3144 cERROR(1, "possible reconnect error");
3145 cERROR(1, "server disabled POSIX path support");
3146 }
3147 }
3148
3149 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3150 cERROR(1, "per-share encryption not supported yet");
3151
3152 cap &= CIFS_UNIX_CAP_MASK;
3153 if (vol_info && vol_info->no_psx_acl)
3154 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3155 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3156 cFYI(1, "negotiated posix acl support");
3157 if (cifs_sb)
3158 cifs_sb->mnt_cifs_flags |=
3159 CIFS_MOUNT_POSIXACL;
3160 }
3161
3162 if (vol_info && vol_info->posix_paths == 0)
3163 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3164 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3165 cFYI(1, "negotiate posix pathnames");
3166 if (cifs_sb)
3167 cifs_sb->mnt_cifs_flags |=
3168 CIFS_MOUNT_POSIX_PATHS;
3169 }
3170
3171 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3172 #ifdef CONFIG_CIFS_DEBUG2
3173 if (cap & CIFS_UNIX_FCNTL_CAP)
3174 cFYI(1, "FCNTL cap");
3175 if (cap & CIFS_UNIX_EXTATTR_CAP)
3176 cFYI(1, "EXTATTR cap");
3177 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3178 cFYI(1, "POSIX path cap");
3179 if (cap & CIFS_UNIX_XATTR_CAP)
3180 cFYI(1, "XATTR cap");
3181 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3182 cFYI(1, "POSIX ACL cap");
3183 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3184 cFYI(1, "very large read cap");
3185 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3186 cFYI(1, "very large write cap");
3187 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3188 cFYI(1, "transport encryption cap");
3189 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3190 cFYI(1, "mandatory transport encryption cap");
3191 #endif /* CIFS_DEBUG2 */
3192 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3193 if (vol_info == NULL) {
3194 cFYI(1, "resetting capabilities failed");
3195 } else
3196 cERROR(1, "Negotiating Unix capabilities "
3197 "with the server failed. Consider "
3198 "mounting with the Unix Extensions "
3199 "disabled if problems are found "
3200 "by specifying the nounix mount "
3201 "option.");
3202
3203 }
3204 }
3205 }
3206
3207 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3208 struct cifs_sb_info *cifs_sb)
3209 {
3210 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3211
3212 spin_lock_init(&cifs_sb->tlink_tree_lock);
3213 cifs_sb->tlink_tree = RB_ROOT;
3214
3215 /*
3216 * Temporarily set r/wsize for matching superblock. If we end up using
3217 * new sb then client will later negotiate it downward if needed.
3218 */
3219 cifs_sb->rsize = pvolume_info->rsize;
3220 cifs_sb->wsize = pvolume_info->wsize;
3221
3222 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3223 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3224 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3225 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3226 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3227 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3228
3229 cifs_sb->actimeo = pvolume_info->actimeo;
3230 cifs_sb->local_nls = pvolume_info->local_nls;
3231
3232 if (pvolume_info->noperm)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3234 if (pvolume_info->setuids)
3235 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3236 if (pvolume_info->server_ino)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3238 if (pvolume_info->remap)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3240 if (pvolume_info->no_xattr)
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3242 if (pvolume_info->sfu_emul)
3243 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3244 if (pvolume_info->nobrl)
3245 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3246 if (pvolume_info->nostrictsync)
3247 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3248 if (pvolume_info->mand_lock)
3249 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3250 if (pvolume_info->rwpidforward)
3251 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3252 if (pvolume_info->cifs_acl)
3253 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3254 if (pvolume_info->backupuid_specified) {
3255 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3256 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3257 }
3258 if (pvolume_info->backupgid_specified) {
3259 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3260 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3261 }
3262 if (pvolume_info->override_uid)
3263 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3264 if (pvolume_info->override_gid)
3265 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3266 if (pvolume_info->dynperm)
3267 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3268 if (pvolume_info->fsc)
3269 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3270 if (pvolume_info->multiuser)
3271 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3272 CIFS_MOUNT_NO_PERM);
3273 if (pvolume_info->strict_io)
3274 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3275 if (pvolume_info->direct_io) {
3276 cFYI(1, "mounting share using direct i/o");
3277 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3278 }
3279 if (pvolume_info->mfsymlinks) {
3280 if (pvolume_info->sfu_emul) {
3281 cERROR(1, "mount option mfsymlinks ignored if sfu "
3282 "mount option is used");
3283 } else {
3284 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3285 }
3286 }
3287
3288 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3289 cERROR(1, "mount option dynperm ignored if cifsacl "
3290 "mount option supported");
3291 }
3292
3293 static void
3294 cleanup_volume_info_contents(struct smb_vol *volume_info)
3295 {
3296 kfree(volume_info->username);
3297 kzfree(volume_info->password);
3298 kfree(volume_info->UNC);
3299 kfree(volume_info->domainname);
3300 kfree(volume_info->iocharset);
3301 kfree(volume_info->prepath);
3302 }
3303
3304 void
3305 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3306 {
3307 if (!volume_info)
3308 return;
3309 cleanup_volume_info_contents(volume_info);
3310 kfree(volume_info);
3311 }
3312
3313
3314 #ifdef CONFIG_CIFS_DFS_UPCALL
3315 /*
3316 * cifs_build_path_to_root returns full path to root when we do not have an
3317 * exiting connection (tcon)
3318 */
3319 static char *
3320 build_unc_path_to_root(const struct smb_vol *vol,
3321 const struct cifs_sb_info *cifs_sb)
3322 {
3323 char *full_path, *pos;
3324 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3325 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3326
3327 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3328 if (full_path == NULL)
3329 return ERR_PTR(-ENOMEM);
3330
3331 strncpy(full_path, vol->UNC, unc_len);
3332 pos = full_path + unc_len;
3333
3334 if (pplen) {
3335 *pos++ = CIFS_DIR_SEP(cifs_sb);
3336 strncpy(pos, vol->prepath, pplen);
3337 pos += pplen;
3338 }
3339
3340 *pos = '\0'; /* add trailing null */
3341 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3342 cFYI(1, "%s: full_path=%s", __func__, full_path);
3343 return full_path;
3344 }
3345
3346 /*
3347 * Perform a dfs referral query for a share and (optionally) prefix
3348 *
3349 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3350 * to a string containing updated options for the submount. Otherwise it
3351 * will be left untouched.
3352 *
3353 * Returns the rc from get_dfs_path to the caller, which can be used to
3354 * determine whether there were referrals.
3355 */
3356 static int
3357 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3358 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3359 int check_prefix)
3360 {
3361 int rc;
3362 unsigned int num_referrals = 0;
3363 struct dfs_info3_param *referrals = NULL;
3364 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3365
3366 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3367 if (IS_ERR(full_path))
3368 return PTR_ERR(full_path);
3369
3370 /* For DFS paths, skip the first '\' of the UNC */
3371 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3372
3373 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3374 &num_referrals, &referrals,
3375 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3376
3377 if (!rc && num_referrals > 0) {
3378 char *fake_devname = NULL;
3379
3380 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3381 full_path + 1, referrals,
3382 &fake_devname);
3383
3384 free_dfs_info_array(referrals, num_referrals);
3385
3386 if (IS_ERR(mdata)) {
3387 rc = PTR_ERR(mdata);
3388 mdata = NULL;
3389 } else {
3390 cleanup_volume_info_contents(volume_info);
3391 rc = cifs_setup_volume_info(volume_info, mdata,
3392 fake_devname);
3393 }
3394 kfree(fake_devname);
3395 kfree(cifs_sb->mountdata);
3396 cifs_sb->mountdata = mdata;
3397 }
3398 kfree(full_path);
3399 return rc;
3400 }
3401 #endif
3402
3403 static int
3404 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3405 const char *devname)
3406 {
3407 int rc = 0;
3408
3409 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3410 return -EINVAL;
3411
3412 if (volume_info->nullauth) {
3413 cFYI(1, "Anonymous login");
3414 kfree(volume_info->username);
3415 volume_info->username = NULL;
3416 } else if (volume_info->username) {
3417 /* BB fixme parse for domain name here */
3418 cFYI(1, "Username: %s", volume_info->username);
3419 } else {
3420 cifserror("No username specified");
3421 /* In userspace mount helper we can get user name from alternate
3422 locations such as env variables and files on disk */
3423 return -EINVAL;
3424 }
3425
3426 /* this is needed for ASCII cp to Unicode converts */
3427 if (volume_info->iocharset == NULL) {
3428 /* load_nls_default cannot return null */
3429 volume_info->local_nls = load_nls_default();
3430 } else {
3431 volume_info->local_nls = load_nls(volume_info->iocharset);
3432 if (volume_info->local_nls == NULL) {
3433 cERROR(1, "CIFS mount error: iocharset %s not found",
3434 volume_info->iocharset);
3435 return -ELIBACC;
3436 }
3437 }
3438
3439 return rc;
3440 }
3441
3442 struct smb_vol *
3443 cifs_get_volume_info(char *mount_data, const char *devname)
3444 {
3445 int rc;
3446 struct smb_vol *volume_info;
3447
3448 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3449 if (!volume_info)
3450 return ERR_PTR(-ENOMEM);
3451
3452 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3453 if (rc) {
3454 cifs_cleanup_volume_info(volume_info);
3455 volume_info = ERR_PTR(rc);
3456 }
3457
3458 return volume_info;
3459 }
3460
3461 int
3462 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3463 {
3464 int rc;
3465 unsigned int xid;
3466 struct cifs_ses *ses;
3467 struct cifs_tcon *tcon;
3468 struct TCP_Server_Info *server;
3469 char *full_path;
3470 struct tcon_link *tlink;
3471 #ifdef CONFIG_CIFS_DFS_UPCALL
3472 int referral_walks_count = 0;
3473 #endif
3474
3475 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3476 if (rc)
3477 return rc;
3478
3479 #ifdef CONFIG_CIFS_DFS_UPCALL
3480 try_mount_again:
3481 /* cleanup activities if we're chasing a referral */
3482 if (referral_walks_count) {
3483 if (tcon)
3484 cifs_put_tcon(tcon);
3485 else if (ses)
3486 cifs_put_smb_ses(ses);
3487
3488 free_xid(xid);
3489 }
3490 #endif
3491 rc = 0;
3492 tcon = NULL;
3493 ses = NULL;
3494 server = NULL;
3495 full_path = NULL;
3496 tlink = NULL;
3497
3498 xid = get_xid();
3499
3500 /* get a reference to a tcp session */
3501 server = cifs_get_tcp_session(volume_info);
3502 if (IS_ERR(server)) {
3503 rc = PTR_ERR(server);
3504 bdi_destroy(&cifs_sb->bdi);
3505 goto out;
3506 }
3507
3508 /* get a reference to a SMB session */
3509 ses = cifs_get_smb_ses(server, volume_info);
3510 if (IS_ERR(ses)) {
3511 rc = PTR_ERR(ses);
3512 ses = NULL;
3513 goto mount_fail_check;
3514 }
3515
3516 /* search for existing tcon to this server share */
3517 tcon = cifs_get_tcon(ses, volume_info);
3518 if (IS_ERR(tcon)) {
3519 rc = PTR_ERR(tcon);
3520 tcon = NULL;
3521 goto remote_path_check;
3522 }
3523
3524 /* tell server which Unix caps we support */
3525 if (cap_unix(tcon->ses)) {
3526 /* reset of caps checks mount to see if unix extensions
3527 disabled for just this mount */
3528 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3529 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3530 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3531 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3532 rc = -EACCES;
3533 goto mount_fail_check;
3534 }
3535 } else
3536 tcon->unix_ext = 0; /* server does not support them */
3537
3538 /* do not care if a following call succeed - informational */
3539 if (!tcon->ipc && server->ops->qfs_tcon)
3540 server->ops->qfs_tcon(xid, tcon);
3541
3542 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3543 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3544
3545 /* tune readahead according to rsize */
3546 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3547
3548 remote_path_check:
3549 #ifdef CONFIG_CIFS_DFS_UPCALL
3550 /*
3551 * Perform an unconditional check for whether there are DFS
3552 * referrals for this path without prefix, to provide support
3553 * for DFS referrals from w2k8 servers which don't seem to respond
3554 * with PATH_NOT_COVERED to requests that include the prefix.
3555 * Chase the referral if found, otherwise continue normally.
3556 */
3557 if (referral_walks_count == 0) {
3558 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3559 false);
3560 if (!refrc) {
3561 referral_walks_count++;
3562 goto try_mount_again;
3563 }
3564 }
3565 #endif
3566
3567 /* check if a whole path is not remote */
3568 if (!rc && tcon) {
3569 if (!server->ops->is_path_accessible) {
3570 rc = -ENOSYS;
3571 goto mount_fail_check;
3572 }
3573 /*
3574 * cifs_build_path_to_root works only when we have a valid tcon
3575 */
3576 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3577 if (full_path == NULL) {
3578 rc = -ENOMEM;
3579 goto mount_fail_check;
3580 }
3581 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3582 full_path);
3583 if (rc != 0 && rc != -EREMOTE) {
3584 kfree(full_path);
3585 goto mount_fail_check;
3586 }
3587 kfree(full_path);
3588 }
3589
3590 /* get referral if needed */
3591 if (rc == -EREMOTE) {
3592 #ifdef CONFIG_CIFS_DFS_UPCALL
3593 if (referral_walks_count > MAX_NESTED_LINKS) {
3594 /*
3595 * BB: when we implement proper loop detection,
3596 * we will remove this check. But now we need it
3597 * to prevent an indefinite loop if 'DFS tree' is
3598 * misconfigured (i.e. has loops).
3599 */
3600 rc = -ELOOP;
3601 goto mount_fail_check;
3602 }
3603
3604 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3605
3606 if (!rc) {
3607 referral_walks_count++;
3608 goto try_mount_again;
3609 }
3610 goto mount_fail_check;
3611 #else /* No DFS support, return error on mount */
3612 rc = -EOPNOTSUPP;
3613 #endif
3614 }
3615
3616 if (rc)
3617 goto mount_fail_check;
3618
3619 /* now, hang the tcon off of the superblock */
3620 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3621 if (tlink == NULL) {
3622 rc = -ENOMEM;
3623 goto mount_fail_check;
3624 }
3625
3626 tlink->tl_uid = ses->linux_uid;
3627 tlink->tl_tcon = tcon;
3628 tlink->tl_time = jiffies;
3629 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3630 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3631
3632 cifs_sb->master_tlink = tlink;
3633 spin_lock(&cifs_sb->tlink_tree_lock);
3634 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3635 spin_unlock(&cifs_sb->tlink_tree_lock);
3636
3637 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3638 TLINK_IDLE_EXPIRE);
3639
3640 mount_fail_check:
3641 /* on error free sesinfo and tcon struct if needed */
3642 if (rc) {
3643 /* If find_unc succeeded then rc == 0 so we can not end */
3644 /* up accidentally freeing someone elses tcon struct */
3645 if (tcon)
3646 cifs_put_tcon(tcon);
3647 else if (ses)
3648 cifs_put_smb_ses(ses);
3649 else
3650 cifs_put_tcp_session(server);
3651 bdi_destroy(&cifs_sb->bdi);
3652 }
3653
3654 out:
3655 free_xid(xid);
3656 return rc;
3657 }
3658
3659 /*
3660 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3661 * pointer may be NULL.
3662 */
3663 int
3664 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3665 const char *tree, struct cifs_tcon *tcon,
3666 const struct nls_table *nls_codepage)
3667 {
3668 struct smb_hdr *smb_buffer;
3669 struct smb_hdr *smb_buffer_response;
3670 TCONX_REQ *pSMB;
3671 TCONX_RSP *pSMBr;
3672 unsigned char *bcc_ptr;
3673 int rc = 0;
3674 int length;
3675 __u16 bytes_left, count;
3676
3677 if (ses == NULL)
3678 return -EIO;
3679
3680 smb_buffer = cifs_buf_get();
3681 if (smb_buffer == NULL)
3682 return -ENOMEM;
3683
3684 smb_buffer_response = smb_buffer;
3685
3686 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3687 NULL /*no tid */ , 4 /*wct */ );
3688
3689 smb_buffer->Mid = get_next_mid(ses->server);
3690 smb_buffer->Uid = ses->Suid;
3691 pSMB = (TCONX_REQ *) smb_buffer;
3692 pSMBr = (TCONX_RSP *) smb_buffer_response;
3693
3694 pSMB->AndXCommand = 0xFF;
3695 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3696 bcc_ptr = &pSMB->Password[0];
3697 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3698 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3699 *bcc_ptr = 0; /* password is null byte */
3700 bcc_ptr++; /* skip password */
3701 /* already aligned so no need to do it below */
3702 } else {
3703 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3704 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3705 specified as required (when that support is added to
3706 the vfs in the future) as only NTLM or the much
3707 weaker LANMAN (which we do not send by default) is accepted
3708 by Samba (not sure whether other servers allow
3709 NTLMv2 password here) */
3710 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3711 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3712 (ses->server->secType == LANMAN))
3713 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3714 ses->server->sec_mode &
3715 SECMODE_PW_ENCRYPT ? true : false,
3716 bcc_ptr);
3717 else
3718 #endif /* CIFS_WEAK_PW_HASH */
3719 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3720 bcc_ptr, nls_codepage);
3721
3722 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3723 if (ses->capabilities & CAP_UNICODE) {
3724 /* must align unicode strings */
3725 *bcc_ptr = 0; /* null byte password */
3726 bcc_ptr++;
3727 }
3728 }
3729
3730 if (ses->server->sec_mode &
3731 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3732 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3733
3734 if (ses->capabilities & CAP_STATUS32) {
3735 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3736 }
3737 if (ses->capabilities & CAP_DFS) {
3738 smb_buffer->Flags2 |= SMBFLG2_DFS;
3739 }
3740 if (ses->capabilities & CAP_UNICODE) {
3741 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3742 length =
3743 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3744 6 /* max utf8 char length in bytes */ *
3745 (/* server len*/ + 256 /* share len */), nls_codepage);
3746 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3747 bcc_ptr += 2; /* skip trailing null */
3748 } else { /* ASCII */
3749 strcpy(bcc_ptr, tree);
3750 bcc_ptr += strlen(tree) + 1;
3751 }
3752 strcpy(bcc_ptr, "?????");
3753 bcc_ptr += strlen("?????");
3754 bcc_ptr += 1;
3755 count = bcc_ptr - &pSMB->Password[0];
3756 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3757 pSMB->hdr.smb_buf_length) + count);
3758 pSMB->ByteCount = cpu_to_le16(count);
3759
3760 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3761 0);
3762
3763 /* above now done in SendReceive */
3764 if ((rc == 0) && (tcon != NULL)) {
3765 bool is_unicode;
3766
3767 tcon->tidStatus = CifsGood;
3768 tcon->need_reconnect = false;
3769 tcon->tid = smb_buffer_response->Tid;
3770 bcc_ptr = pByteArea(smb_buffer_response);
3771 bytes_left = get_bcc(smb_buffer_response);
3772 length = strnlen(bcc_ptr, bytes_left - 2);
3773 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3774 is_unicode = true;
3775 else
3776 is_unicode = false;
3777
3778
3779 /* skip service field (NB: this field is always ASCII) */
3780 if (length == 3) {
3781 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3782 (bcc_ptr[2] == 'C')) {
3783 cFYI(1, "IPC connection");
3784 tcon->ipc = 1;
3785 }
3786 } else if (length == 2) {
3787 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3788 /* the most common case */
3789 cFYI(1, "disk share connection");
3790 }
3791 }
3792 bcc_ptr += length + 1;
3793 bytes_left -= (length + 1);
3794 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3795
3796 /* mostly informational -- no need to fail on error here */
3797 kfree(tcon->nativeFileSystem);
3798 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3799 bytes_left, is_unicode,
3800 nls_codepage);
3801
3802 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3803
3804 if ((smb_buffer_response->WordCount == 3) ||
3805 (smb_buffer_response->WordCount == 7))
3806 /* field is in same location */
3807 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3808 else
3809 tcon->Flags = 0;
3810 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3811 } else if ((rc == 0) && tcon == NULL) {
3812 /* all we need to save for IPC$ connection */
3813 ses->ipc_tid = smb_buffer_response->Tid;
3814 }
3815
3816 cifs_buf_release(smb_buffer);
3817 return rc;
3818 }
3819
3820 void
3821 cifs_umount(struct cifs_sb_info *cifs_sb)
3822 {
3823 struct rb_root *root = &cifs_sb->tlink_tree;
3824 struct rb_node *node;
3825 struct tcon_link *tlink;
3826
3827 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3828
3829 spin_lock(&cifs_sb->tlink_tree_lock);
3830 while ((node = rb_first(root))) {
3831 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3832 cifs_get_tlink(tlink);
3833 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3834 rb_erase(node, root);
3835
3836 spin_unlock(&cifs_sb->tlink_tree_lock);
3837 cifs_put_tlink(tlink);
3838 spin_lock(&cifs_sb->tlink_tree_lock);
3839 }
3840 spin_unlock(&cifs_sb->tlink_tree_lock);
3841
3842 bdi_destroy(&cifs_sb->bdi);
3843 kfree(cifs_sb->mountdata);
3844 unload_nls(cifs_sb->local_nls);
3845 kfree(cifs_sb);
3846 }
3847
3848 int
3849 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3850 {
3851 int rc = 0;
3852 struct TCP_Server_Info *server = ses->server;
3853
3854 if (!server->ops->need_neg || !server->ops->negotiate)
3855 return -ENOSYS;
3856
3857 /* only send once per connect */
3858 if (!server->ops->need_neg(server))
3859 return 0;
3860
3861 set_credits(server, 1);
3862
3863 rc = server->ops->negotiate(xid, ses);
3864 if (rc == 0) {
3865 spin_lock(&GlobalMid_Lock);
3866 if (server->tcpStatus == CifsNeedNegotiate)
3867 server->tcpStatus = CifsGood;
3868 else
3869 rc = -EHOSTDOWN;
3870 spin_unlock(&GlobalMid_Lock);
3871 }
3872
3873 return rc;
3874 }
3875
3876 int
3877 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3878 struct nls_table *nls_info)
3879 {
3880 int rc = -ENOSYS;
3881 struct TCP_Server_Info *server = ses->server;
3882
3883 ses->flags = 0;
3884 ses->capabilities = server->capabilities;
3885 if (linuxExtEnabled == 0)
3886 ses->capabilities &= (~server->vals->cap_unix);
3887
3888 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3889 server->sec_mode, server->capabilities, server->timeAdj);
3890
3891 if (server->ops->sess_setup)
3892 rc = server->ops->sess_setup(xid, ses, nls_info);
3893
3894 if (rc) {
3895 cERROR(1, "Send error in SessSetup = %d", rc);
3896 } else {
3897 mutex_lock(&ses->server->srv_mutex);
3898 if (!server->session_estab) {
3899 server->session_key.response = ses->auth_key.response;
3900 server->session_key.len = ses->auth_key.len;
3901 server->sequence_number = 0x2;
3902 server->session_estab = true;
3903 ses->auth_key.response = NULL;
3904 }
3905 mutex_unlock(&server->srv_mutex);
3906
3907 cFYI(1, "CIFS Session Established successfully");
3908 spin_lock(&GlobalMid_Lock);
3909 ses->status = CifsGood;
3910 ses->need_reconnect = false;
3911 spin_unlock(&GlobalMid_Lock);
3912 }
3913
3914 kfree(ses->auth_key.response);
3915 ses->auth_key.response = NULL;
3916 ses->auth_key.len = 0;
3917 kfree(ses->ntlmssp);
3918 ses->ntlmssp = NULL;
3919
3920 return rc;
3921 }
3922
3923 static int
3924 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3925 {
3926 switch (ses->server->secType) {
3927 case Kerberos:
3928 vol->secFlg = CIFSSEC_MUST_KRB5;
3929 return 0;
3930 case NTLMv2:
3931 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3932 break;
3933 case NTLM:
3934 vol->secFlg = CIFSSEC_MUST_NTLM;
3935 break;
3936 case RawNTLMSSP:
3937 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3938 break;
3939 case LANMAN:
3940 vol->secFlg = CIFSSEC_MUST_LANMAN;
3941 break;
3942 }
3943
3944 return cifs_set_cifscreds(vol, ses);
3945 }
3946
3947 static struct cifs_tcon *
3948 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3949 {
3950 int rc;
3951 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3952 struct cifs_ses *ses;
3953 struct cifs_tcon *tcon = NULL;
3954 struct smb_vol *vol_info;
3955
3956 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3957 if (vol_info == NULL)
3958 return ERR_PTR(-ENOMEM);
3959
3960 vol_info->local_nls = cifs_sb->local_nls;
3961 vol_info->linux_uid = fsuid;
3962 vol_info->cred_uid = fsuid;
3963 vol_info->UNC = master_tcon->treeName;
3964 vol_info->retry = master_tcon->retry;
3965 vol_info->nocase = master_tcon->nocase;
3966 vol_info->local_lease = master_tcon->local_lease;
3967 vol_info->no_linux_ext = !master_tcon->unix_ext;
3968
3969 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3970 if (rc) {
3971 tcon = ERR_PTR(rc);
3972 goto out;
3973 }
3974
3975 /* get a reference for the same TCP session */
3976 spin_lock(&cifs_tcp_ses_lock);
3977 ++master_tcon->ses->server->srv_count;
3978 spin_unlock(&cifs_tcp_ses_lock);
3979
3980 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3981 if (IS_ERR(ses)) {
3982 tcon = (struct cifs_tcon *)ses;
3983 cifs_put_tcp_session(master_tcon->ses->server);
3984 goto out;
3985 }
3986
3987 tcon = cifs_get_tcon(ses, vol_info);
3988 if (IS_ERR(tcon)) {
3989 cifs_put_smb_ses(ses);
3990 goto out;
3991 }
3992
3993 if (cap_unix(ses))
3994 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3995 out:
3996 kfree(vol_info->username);
3997 kfree(vol_info->password);
3998 kfree(vol_info);
3999
4000 return tcon;
4001 }
4002
4003 struct cifs_tcon *
4004 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4005 {
4006 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4007 }
4008
4009 static int
4010 cifs_sb_tcon_pending_wait(void *unused)
4011 {
4012 schedule();
4013 return signal_pending(current) ? -ERESTARTSYS : 0;
4014 }
4015
4016 /* find and return a tlink with given uid */
4017 static struct tcon_link *
4018 tlink_rb_search(struct rb_root *root, kuid_t uid)
4019 {
4020 struct rb_node *node = root->rb_node;
4021 struct tcon_link *tlink;
4022
4023 while (node) {
4024 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4025
4026 if (uid_gt(tlink->tl_uid, uid))
4027 node = node->rb_left;
4028 else if (uid_lt(tlink->tl_uid, uid))
4029 node = node->rb_right;
4030 else
4031 return tlink;
4032 }
4033 return NULL;
4034 }
4035
4036 /* insert a tcon_link into the tree */
4037 static void
4038 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4039 {
4040 struct rb_node **new = &(root->rb_node), *parent = NULL;
4041 struct tcon_link *tlink;
4042
4043 while (*new) {
4044 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4045 parent = *new;
4046
4047 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4048 new = &((*new)->rb_left);
4049 else
4050 new = &((*new)->rb_right);
4051 }
4052
4053 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4054 rb_insert_color(&new_tlink->tl_rbnode, root);
4055 }
4056
4057 /*
4058 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4059 * current task.
4060 *
4061 * If the superblock doesn't refer to a multiuser mount, then just return
4062 * the master tcon for the mount.
4063 *
4064 * First, search the rbtree for an existing tcon for this fsuid. If one
4065 * exists, then check to see if it's pending construction. If it is then wait
4066 * for construction to complete. Once it's no longer pending, check to see if
4067 * it failed and either return an error or retry construction, depending on
4068 * the timeout.
4069 *
4070 * If one doesn't exist then insert a new tcon_link struct into the tree and
4071 * try to construct a new one.
4072 */
4073 struct tcon_link *
4074 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4075 {
4076 int ret;
4077 kuid_t fsuid = current_fsuid();
4078 struct tcon_link *tlink, *newtlink;
4079
4080 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4081 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4082
4083 spin_lock(&cifs_sb->tlink_tree_lock);
4084 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4085 if (tlink)
4086 cifs_get_tlink(tlink);
4087 spin_unlock(&cifs_sb->tlink_tree_lock);
4088
4089 if (tlink == NULL) {
4090 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4091 if (newtlink == NULL)
4092 return ERR_PTR(-ENOMEM);
4093 newtlink->tl_uid = fsuid;
4094 newtlink->tl_tcon = ERR_PTR(-EACCES);
4095 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4096 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4097 cifs_get_tlink(newtlink);
4098
4099 spin_lock(&cifs_sb->tlink_tree_lock);
4100 /* was one inserted after previous search? */
4101 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4102 if (tlink) {
4103 cifs_get_tlink(tlink);
4104 spin_unlock(&cifs_sb->tlink_tree_lock);
4105 kfree(newtlink);
4106 goto wait_for_construction;
4107 }
4108 tlink = newtlink;
4109 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4110 spin_unlock(&cifs_sb->tlink_tree_lock);
4111 } else {
4112 wait_for_construction:
4113 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4114 cifs_sb_tcon_pending_wait,
4115 TASK_INTERRUPTIBLE);
4116 if (ret) {
4117 cifs_put_tlink(tlink);
4118 return ERR_PTR(ret);
4119 }
4120
4121 /* if it's good, return it */
4122 if (!IS_ERR(tlink->tl_tcon))
4123 return tlink;
4124
4125 /* return error if we tried this already recently */
4126 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4127 cifs_put_tlink(tlink);
4128 return ERR_PTR(-EACCES);
4129 }
4130
4131 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4132 goto wait_for_construction;
4133 }
4134
4135 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4136 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4137 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4138
4139 if (IS_ERR(tlink->tl_tcon)) {
4140 cifs_put_tlink(tlink);
4141 return ERR_PTR(-EACCES);
4142 }
4143
4144 return tlink;
4145 }
4146
4147 /*
4148 * periodic workqueue job that scans tcon_tree for a superblock and closes
4149 * out tcons.
4150 */
4151 static void
4152 cifs_prune_tlinks(struct work_struct *work)
4153 {
4154 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4155 prune_tlinks.work);
4156 struct rb_root *root = &cifs_sb->tlink_tree;
4157 struct rb_node *node = rb_first(root);
4158 struct rb_node *tmp;
4159 struct tcon_link *tlink;
4160
4161 /*
4162 * Because we drop the spinlock in the loop in order to put the tlink
4163 * it's not guarded against removal of links from the tree. The only
4164 * places that remove entries from the tree are this function and
4165 * umounts. Because this function is non-reentrant and is canceled
4166 * before umount can proceed, this is safe.
4167 */
4168 spin_lock(&cifs_sb->tlink_tree_lock);
4169 node = rb_first(root);
4170 while (node != NULL) {
4171 tmp = node;
4172 node = rb_next(tmp);
4173 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4174
4175 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4176 atomic_read(&tlink->tl_count) != 0 ||
4177 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4178 continue;
4179
4180 cifs_get_tlink(tlink);
4181 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4182 rb_erase(tmp, root);
4183
4184 spin_unlock(&cifs_sb->tlink_tree_lock);
4185 cifs_put_tlink(tlink);
4186 spin_lock(&cifs_sb->tlink_tree_lock);
4187 }
4188 spin_unlock(&cifs_sb->tlink_tree_lock);
4189
4190 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4191 TLINK_IDLE_EXPIRE);
4192 }
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