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ARM: mcpm: provide an interface to set the SMP ops at run time
[linux-2.6.git] / fs / cifs / connect.c
blob991c63c6bdd053189082c6208407a5df55b29053
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 vol->password = NULL;
1579 break;
1580 case Opt_pass:
1581 /* passwords have to be handled differently
1582 * to allow the character used for deliminator
1583 * to be passed within them
1584 */
1585
1586 /* Obtain the value string */
1587 value = strchr(data, '=');
1588 value++;
1589
1590 /* Set tmp_end to end of the string */
1591 tmp_end = (char *) value + strlen(value);
1592
1593 /* Check if following character is the deliminator
1594 * If yes, we have encountered a double deliminator
1595 * reset the NULL character to the deliminator
1596 */
1597 if (tmp_end < end && tmp_end[1] == delim) {
1598 tmp_end[0] = delim;
1599
1600 /* Keep iterating until we get to a single
1601 * deliminator OR the end
1602 */
1603 while ((tmp_end = strchr(tmp_end, delim))
1604 != NULL && (tmp_end[1] == delim)) {
1605 tmp_end = (char *) &tmp_end[2];
1606 }
1607
1608 /* Reset var options to point to next element */
1609 if (tmp_end) {
1610 tmp_end[0] = '\0';
1611 options = (char *) &tmp_end[1];
1612 } else
1613 /* Reached the end of the mount option
1614 * string */
1615 options = end;
1616 }
1617
1618 /* Now build new password string */
1619 temp_len = strlen(value);
1620 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1621 if (vol->password == NULL) {
1622 printk(KERN_WARNING "CIFS: no memory "
1623 "for password\n");
1624 goto cifs_parse_mount_err;
1625 }
1626
1627 for (i = 0, j = 0; i < temp_len; i++, j++) {
1628 vol->password[j] = value[i];
1629 if ((value[i] == delim) &&
1630 value[i+1] == delim)
1631 /* skip the second deliminator */
1632 i++;
1633 }
1634 vol->password[j] = '\0';
1635 break;
1636 case Opt_blank_ip:
1637 /* FIXME: should this be an error instead? */
1638 got_ip = false;
1639 break;
1640 case Opt_ip:
1641 string = match_strdup(args);
1642 if (string == NULL)
1643 goto out_nomem;
1644
1645 if (!cifs_convert_address(dstaddr, string,
1646 strlen(string))) {
1647 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1648 string);
1649 goto cifs_parse_mount_err;
1650 }
1651 got_ip = true;
1652 break;
1653 case Opt_unc:
1654 string = vol->UNC;
1655 vol->UNC = match_strdup(args);
1656 if (vol->UNC == NULL)
1657 goto out_nomem;
1658
1659 convert_delimiter(vol->UNC, '\\');
1660 if (vol->UNC[0] != '\\' || vol->UNC[1] != '\\') {
1661 printk(KERN_ERR "CIFS: UNC Path does not "
1662 "begin with // or \\\\\n");
1663 goto cifs_parse_mount_err;
1664 }
1665
1666 /* Compare old unc= option to new one */
1667 if (!string || strcmp(string, vol->UNC))
1668 printk(KERN_WARNING "CIFS: the value of the "
1669 "unc= mount option does not match the "
1670 "device string. Using the unc= option "
1671 "for now. In 3.10, that option will "
1672 "be ignored and the contents of the "
1673 "device string will be used "
1674 "instead. (%s != %s)\n", string,
1675 vol->UNC);
1676 break;
1677 case Opt_domain:
1678 string = match_strdup(args);
1679 if (string == NULL)
1680 goto out_nomem;
1681
1682 if (strnlen(string, 256) == 256) {
1683 printk(KERN_WARNING "CIFS: domain name too"
1684 " long\n");
1685 goto cifs_parse_mount_err;
1686 }
1687
1688 vol->domainname = kstrdup(string, GFP_KERNEL);
1689 if (!vol->domainname) {
1690 printk(KERN_WARNING "CIFS: no memory "
1691 "for domainname\n");
1692 goto cifs_parse_mount_err;
1693 }
1694 cFYI(1, "Domain name set");
1695 break;
1696 case Opt_srcaddr:
1697 string = match_strdup(args);
1698 if (string == NULL)
1699 goto out_nomem;
1700
1701 if (!cifs_convert_address(
1702 (struct sockaddr *)&vol->srcaddr,
1703 string, strlen(string))) {
1704 printk(KERN_WARNING "CIFS: Could not parse"
1705 " srcaddr: %s\n", string);
1706 goto cifs_parse_mount_err;
1707 }
1708 break;
1709 case Opt_prefixpath:
1710 /* skip over any leading delimiter */
1711 if (*args[0].from == '/' || *args[0].from == '\\')
1712 args[0].from++;
1713
1714 string = vol->prepath;
1715 vol->prepath = match_strdup(args);
1716 if (vol->prepath == NULL)
1717 goto out_nomem;
1718 /* Compare old prefixpath= option to new one */
1719 if (!string || strcmp(string, vol->prepath))
1720 printk(KERN_WARNING "CIFS: the value of the "
1721 "prefixpath= mount option does not "
1722 "match the device string. Using the "
1723 "prefixpath= option for now. In 3.10, "
1724 "that option will be ignored and the "
1725 "contents of the device string will be "
1726 "used instead.(%s != %s)\n", string,
1727 vol->prepath);
1728 break;
1729 case Opt_iocharset:
1730 string = match_strdup(args);
1731 if (string == NULL)
1732 goto out_nomem;
1733
1734 if (strnlen(string, 1024) >= 65) {
1735 printk(KERN_WARNING "CIFS: iocharset name "
1736 "too long.\n");
1737 goto cifs_parse_mount_err;
1738 }
1739
1740 if (strnicmp(string, "default", 7) != 0) {
1741 vol->iocharset = kstrdup(string,
1742 GFP_KERNEL);
1743 if (!vol->iocharset) {
1744 printk(KERN_WARNING "CIFS: no memory"
1745 "for charset\n");
1746 goto cifs_parse_mount_err;
1747 }
1748 }
1749 /* if iocharset not set then load_nls_default
1750 * is used by caller
1751 */
1752 cFYI(1, "iocharset set to %s", string);
1753 break;
1754 case Opt_netbiosname:
1755 string = match_strdup(args);
1756 if (string == NULL)
1757 goto out_nomem;
1758
1759 memset(vol->source_rfc1001_name, 0x20,
1760 RFC1001_NAME_LEN);
1761 /*
1762 * FIXME: are there cases in which a comma can
1763 * be valid in workstation netbios name (and
1764 * need special handling)?
1765 */
1766 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1767 /* don't ucase netbiosname for user */
1768 if (string[i] == 0)
1769 break;
1770 vol->source_rfc1001_name[i] = string[i];
1771 }
1772 /* The string has 16th byte zero still from
1773 * set at top of the function
1774 */
1775 if (i == RFC1001_NAME_LEN && string[i] != 0)
1776 printk(KERN_WARNING "CIFS: netbiosname"
1777 " longer than 15 truncated.\n");
1778
1779 break;
1780 case Opt_servern:
1781 /* servernetbiosname specified override *SMBSERVER */
1782 string = match_strdup(args);
1783 if (string == NULL)
1784 goto out_nomem;
1785
1786 /* last byte, type, is 0x20 for servr type */
1787 memset(vol->target_rfc1001_name, 0x20,
1788 RFC1001_NAME_LEN_WITH_NULL);
1789
1790 /* BB are there cases in which a comma can be
1791 valid in this workstation netbios name
1792 (and need special handling)? */
1793
1794 /* user or mount helper must uppercase the
1795 netbios name */
1796 for (i = 0; i < 15; i++) {
1797 if (string[i] == 0)
1798 break;
1799 vol->target_rfc1001_name[i] = string[i];
1800 }
1801 /* The string has 16th byte zero still from
1802 set at top of the function */
1803 if (i == RFC1001_NAME_LEN && string[i] != 0)
1804 printk(KERN_WARNING "CIFS: server net"
1805 "biosname longer than 15 truncated.\n");
1806 break;
1807 case Opt_ver:
1808 string = match_strdup(args);
1809 if (string == NULL)
1810 goto out_nomem;
1811
1812 if (strnicmp(string, "1", 1) == 0) {
1813 /* This is the default */
1814 break;
1815 }
1816 /* For all other value, error */
1817 printk(KERN_WARNING "CIFS: Invalid version"
1818 " specified\n");
1819 goto cifs_parse_mount_err;
1820 case Opt_vers:
1821 string = match_strdup(args);
1822 if (string == NULL)
1823 goto out_nomem;
1824
1825 if (cifs_parse_smb_version(string, vol) != 0)
1826 goto cifs_parse_mount_err;
1827 break;
1828 case Opt_sec:
1829 string = match_strdup(args);
1830 if (string == NULL)
1831 goto out_nomem;
1832
1833 if (cifs_parse_security_flavors(string, vol) != 0)
1834 goto cifs_parse_mount_err;
1835 break;
1836 case Opt_cache:
1837 string = match_strdup(args);
1838 if (string == NULL)
1839 goto out_nomem;
1840
1841 if (cifs_parse_cache_flavor(string, vol) != 0)
1842 goto cifs_parse_mount_err;
1843 break;
1844 default:
1845 /*
1846 * An option we don't recognize. Save it off for later
1847 * if we haven't already found one
1848 */
1849 if (!invalid)
1850 invalid = data;
1851 break;
1852 }
1853 /* Free up any allocated string */
1854 kfree(string);
1855 string = NULL;
1856 }
1857
1858 if (!sloppy && invalid) {
1859 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1860 goto cifs_parse_mount_err;
1861 }
1862
1863 #ifndef CONFIG_KEYS
1864 /* Muliuser mounts require CONFIG_KEYS support */
1865 if (vol->multiuser) {
1866 cERROR(1, "Multiuser mounts require kernels with "
1867 "CONFIG_KEYS enabled.");
1868 goto cifs_parse_mount_err;
1869 }
1870 #endif
1871 if (!vol->UNC) {
1872 cERROR(1, "CIFS mount error: No usable UNC path provided in "
1873 "device string or in unc= option!");
1874 goto cifs_parse_mount_err;
1875 }
1876
1877 /* make sure UNC has a share name */
1878 if (!strchr(vol->UNC + 3, '\\')) {
1879 cERROR(1, "Malformed UNC. Unable to find share name.");
1880 goto cifs_parse_mount_err;
1881 }
1882
1883 if (!got_ip) {
1884 /* No ip= option specified? Try to get it from UNC */
1885 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1886 strlen(&vol->UNC[2]))) {
1887 printk(KERN_ERR "Unable to determine destination "
1888 "address.\n");
1889 goto cifs_parse_mount_err;
1890 }
1891 }
1892
1893 /* set the port that we got earlier */
1894 cifs_set_port(dstaddr, port);
1895
1896 if (uid_specified)
1897 vol->override_uid = override_uid;
1898 else if (override_uid == 1)
1899 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1900 "specified with no uid= option.\n");
1901
1902 if (gid_specified)
1903 vol->override_gid = override_gid;
1904 else if (override_gid == 1)
1905 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1906 "specified with no gid= option.\n");
1907
1908 kfree(mountdata_copy);
1909 return 0;
1910
1911 out_nomem:
1912 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1913 cifs_parse_mount_err:
1914 kfree(string);
1915 kfree(mountdata_copy);
1916 return 1;
1917 }
1918
1919 /** Returns true if srcaddr isn't specified and rhs isn't
1920 * specified, or if srcaddr is specified and
1921 * matches the IP address of the rhs argument.
1922 */
1923 static bool
1924 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1925 {
1926 switch (srcaddr->sa_family) {
1927 case AF_UNSPEC:
1928 return (rhs->sa_family == AF_UNSPEC);
1929 case AF_INET: {
1930 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1931 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1932 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1933 }
1934 case AF_INET6: {
1935 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1936 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1937 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1938 }
1939 default:
1940 WARN_ON(1);
1941 return false; /* don't expect to be here */
1942 }
1943 }
1944
1945 /*
1946 * If no port is specified in addr structure, we try to match with 445 port
1947 * and if it fails - with 139 ports. It should be called only if address
1948 * families of server and addr are equal.
1949 */
1950 static bool
1951 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1952 {
1953 __be16 port, *sport;
1954
1955 switch (addr->sa_family) {
1956 case AF_INET:
1957 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1958 port = ((struct sockaddr_in *) addr)->sin_port;
1959 break;
1960 case AF_INET6:
1961 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1962 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1963 break;
1964 default:
1965 WARN_ON(1);
1966 return false;
1967 }
1968
1969 if (!port) {
1970 port = htons(CIFS_PORT);
1971 if (port == *sport)
1972 return true;
1973
1974 port = htons(RFC1001_PORT);
1975 }
1976
1977 return port == *sport;
1978 }
1979
1980 static bool
1981 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1982 struct sockaddr *srcaddr)
1983 {
1984 switch (addr->sa_family) {
1985 case AF_INET: {
1986 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1987 struct sockaddr_in *srv_addr4 =
1988 (struct sockaddr_in *)&server->dstaddr;
1989
1990 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1991 return false;
1992 break;
1993 }
1994 case AF_INET6: {
1995 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1996 struct sockaddr_in6 *srv_addr6 =
1997 (struct sockaddr_in6 *)&server->dstaddr;
1998
1999 if (!ipv6_addr_equal(&addr6->sin6_addr,
2000 &srv_addr6->sin6_addr))
2001 return false;
2002 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2003 return false;
2004 break;
2005 }
2006 default:
2007 WARN_ON(1);
2008 return false; /* don't expect to be here */
2009 }
2010
2011 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2012 return false;
2013
2014 return true;
2015 }
2016
2017 static bool
2018 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2019 {
2020 unsigned int secFlags;
2021
2022 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
2023 secFlags = vol->secFlg;
2024 else
2025 secFlags = global_secflags | vol->secFlg;
2026
2027 switch (server->secType) {
2028 case LANMAN:
2029 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
2030 return false;
2031 break;
2032 case NTLMv2:
2033 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
2034 return false;
2035 break;
2036 case NTLM:
2037 if (!(secFlags & CIFSSEC_MAY_NTLM))
2038 return false;
2039 break;
2040 case Kerberos:
2041 if (!(secFlags & CIFSSEC_MAY_KRB5))
2042 return false;
2043 break;
2044 case RawNTLMSSP:
2045 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2046 return false;
2047 break;
2048 default:
2049 /* shouldn't happen */
2050 return false;
2051 }
2052
2053 /* now check if signing mode is acceptable */
2054 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2055 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2056 return false;
2057 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2058 (server->sec_mode &
2059 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2060 return false;
2061
2062 return true;
2063 }
2064
2065 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2066 {
2067 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2068
2069 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2070 return 0;
2071
2072 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2073 return 0;
2074
2075 if (!match_address(server, addr,
2076 (struct sockaddr *)&vol->srcaddr))
2077 return 0;
2078
2079 if (!match_port(server, addr))
2080 return 0;
2081
2082 if (!match_security(server, vol))
2083 return 0;
2084
2085 return 1;
2086 }
2087
2088 static struct TCP_Server_Info *
2089 cifs_find_tcp_session(struct smb_vol *vol)
2090 {
2091 struct TCP_Server_Info *server;
2092
2093 spin_lock(&cifs_tcp_ses_lock);
2094 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2095 if (!match_server(server, vol))
2096 continue;
2097
2098 ++server->srv_count;
2099 spin_unlock(&cifs_tcp_ses_lock);
2100 cFYI(1, "Existing tcp session with server found");
2101 return server;
2102 }
2103 spin_unlock(&cifs_tcp_ses_lock);
2104 return NULL;
2105 }
2106
2107 static void
2108 cifs_put_tcp_session(struct TCP_Server_Info *server)
2109 {
2110 struct task_struct *task;
2111
2112 spin_lock(&cifs_tcp_ses_lock);
2113 if (--server->srv_count > 0) {
2114 spin_unlock(&cifs_tcp_ses_lock);
2115 return;
2116 }
2117
2118 put_net(cifs_net_ns(server));
2119
2120 list_del_init(&server->tcp_ses_list);
2121 spin_unlock(&cifs_tcp_ses_lock);
2122
2123 cancel_delayed_work_sync(&server->echo);
2124
2125 spin_lock(&GlobalMid_Lock);
2126 server->tcpStatus = CifsExiting;
2127 spin_unlock(&GlobalMid_Lock);
2128
2129 cifs_crypto_shash_release(server);
2130 cifs_fscache_release_client_cookie(server);
2131
2132 kfree(server->session_key.response);
2133 server->session_key.response = NULL;
2134 server->session_key.len = 0;
2135
2136 task = xchg(&server->tsk, NULL);
2137 if (task)
2138 force_sig(SIGKILL, task);
2139 }
2140
2141 static struct TCP_Server_Info *
2142 cifs_get_tcp_session(struct smb_vol *volume_info)
2143 {
2144 struct TCP_Server_Info *tcp_ses = NULL;
2145 int rc;
2146
2147 cFYI(1, "UNC: %s", volume_info->UNC);
2148
2149 /* see if we already have a matching tcp_ses */
2150 tcp_ses = cifs_find_tcp_session(volume_info);
2151 if (tcp_ses)
2152 return tcp_ses;
2153
2154 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2155 if (!tcp_ses) {
2156 rc = -ENOMEM;
2157 goto out_err;
2158 }
2159
2160 rc = cifs_crypto_shash_allocate(tcp_ses);
2161 if (rc) {
2162 cERROR(1, "could not setup hash structures rc %d", rc);
2163 goto out_err;
2164 }
2165
2166 tcp_ses->ops = volume_info->ops;
2167 tcp_ses->vals = volume_info->vals;
2168 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2169 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2170 if (IS_ERR(tcp_ses->hostname)) {
2171 rc = PTR_ERR(tcp_ses->hostname);
2172 goto out_err_crypto_release;
2173 }
2174
2175 tcp_ses->noblocksnd = volume_info->noblocksnd;
2176 tcp_ses->noautotune = volume_info->noautotune;
2177 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2178 tcp_ses->in_flight = 0;
2179 tcp_ses->credits = 1;
2180 init_waitqueue_head(&tcp_ses->response_q);
2181 init_waitqueue_head(&tcp_ses->request_q);
2182 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2183 mutex_init(&tcp_ses->srv_mutex);
2184 memcpy(tcp_ses->workstation_RFC1001_name,
2185 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2186 memcpy(tcp_ses->server_RFC1001_name,
2187 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2188 tcp_ses->session_estab = false;
2189 tcp_ses->sequence_number = 0;
2190 tcp_ses->lstrp = jiffies;
2191 spin_lock_init(&tcp_ses->req_lock);
2192 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2193 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2194 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2195 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2196 sizeof(tcp_ses->srcaddr));
2197 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2198 sizeof(tcp_ses->dstaddr));
2199 /*
2200 * at this point we are the only ones with the pointer
2201 * to the struct since the kernel thread not created yet
2202 * no need to spinlock this init of tcpStatus or srv_count
2203 */
2204 tcp_ses->tcpStatus = CifsNew;
2205 ++tcp_ses->srv_count;
2206
2207 rc = ip_connect(tcp_ses);
2208 if (rc < 0) {
2209 cERROR(1, "Error connecting to socket. Aborting operation");
2210 goto out_err_crypto_release;
2211 }
2212
2213 /*
2214 * since we're in a cifs function already, we know that
2215 * this will succeed. No need for try_module_get().
2216 */
2217 __module_get(THIS_MODULE);
2218 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2219 tcp_ses, "cifsd");
2220 if (IS_ERR(tcp_ses->tsk)) {
2221 rc = PTR_ERR(tcp_ses->tsk);
2222 cERROR(1, "error %d create cifsd thread", rc);
2223 module_put(THIS_MODULE);
2224 goto out_err_crypto_release;
2225 }
2226 tcp_ses->tcpStatus = CifsNeedNegotiate;
2227
2228 /* thread spawned, put it on the list */
2229 spin_lock(&cifs_tcp_ses_lock);
2230 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2231 spin_unlock(&cifs_tcp_ses_lock);
2232
2233 cifs_fscache_get_client_cookie(tcp_ses);
2234
2235 /* queue echo request delayed work */
2236 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2237
2238 return tcp_ses;
2239
2240 out_err_crypto_release:
2241 cifs_crypto_shash_release(tcp_ses);
2242
2243 put_net(cifs_net_ns(tcp_ses));
2244
2245 out_err:
2246 if (tcp_ses) {
2247 if (!IS_ERR(tcp_ses->hostname))
2248 kfree(tcp_ses->hostname);
2249 if (tcp_ses->ssocket)
2250 sock_release(tcp_ses->ssocket);
2251 kfree(tcp_ses);
2252 }
2253 return ERR_PTR(rc);
2254 }
2255
2256 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2257 {
2258 switch (ses->server->secType) {
2259 case Kerberos:
2260 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2261 return 0;
2262 break;
2263 default:
2264 /* NULL username means anonymous session */
2265 if (ses->user_name == NULL) {
2266 if (!vol->nullauth)
2267 return 0;
2268 break;
2269 }
2270
2271 /* anything else takes username/password */
2272 if (strncmp(ses->user_name,
2273 vol->username ? vol->username : "",
2274 MAX_USERNAME_SIZE))
2275 return 0;
2276 if (strlen(vol->username) != 0 &&
2277 ses->password != NULL &&
2278 strncmp(ses->password,
2279 vol->password ? vol->password : "",
2280 MAX_PASSWORD_SIZE))
2281 return 0;
2282 }
2283 return 1;
2284 }
2285
2286 static struct cifs_ses *
2287 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2288 {
2289 struct cifs_ses *ses;
2290
2291 spin_lock(&cifs_tcp_ses_lock);
2292 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2293 if (!match_session(ses, vol))
2294 continue;
2295 ++ses->ses_count;
2296 spin_unlock(&cifs_tcp_ses_lock);
2297 return ses;
2298 }
2299 spin_unlock(&cifs_tcp_ses_lock);
2300 return NULL;
2301 }
2302
2303 static void
2304 cifs_put_smb_ses(struct cifs_ses *ses)
2305 {
2306 unsigned int xid;
2307 struct TCP_Server_Info *server = ses->server;
2308
2309 cFYI(1, "%s: ses_count=%d", __func__, ses->ses_count);
2310 spin_lock(&cifs_tcp_ses_lock);
2311 if (--ses->ses_count > 0) {
2312 spin_unlock(&cifs_tcp_ses_lock);
2313 return;
2314 }
2315
2316 list_del_init(&ses->smb_ses_list);
2317 spin_unlock(&cifs_tcp_ses_lock);
2318
2319 if (ses->status == CifsGood && server->ops->logoff) {
2320 xid = get_xid();
2321 server->ops->logoff(xid, ses);
2322 _free_xid(xid);
2323 }
2324 sesInfoFree(ses);
2325 cifs_put_tcp_session(server);
2326 }
2327
2328 #ifdef CONFIG_KEYS
2329
2330 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2331 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2332
2333 /* Populate username and pw fields from keyring if possible */
2334 static int
2335 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2336 {
2337 int rc = 0;
2338 char *desc, *delim, *payload;
2339 ssize_t len;
2340 struct key *key;
2341 struct TCP_Server_Info *server = ses->server;
2342 struct sockaddr_in *sa;
2343 struct sockaddr_in6 *sa6;
2344 struct user_key_payload *upayload;
2345
2346 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2347 if (!desc)
2348 return -ENOMEM;
2349
2350 /* try to find an address key first */
2351 switch (server->dstaddr.ss_family) {
2352 case AF_INET:
2353 sa = (struct sockaddr_in *)&server->dstaddr;
2354 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2355 break;
2356 case AF_INET6:
2357 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2358 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2359 break;
2360 default:
2361 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2362 rc = -EINVAL;
2363 goto out_err;
2364 }
2365
2366 cFYI(1, "%s: desc=%s", __func__, desc);
2367 key = request_key(&key_type_logon, desc, "");
2368 if (IS_ERR(key)) {
2369 if (!ses->domainName) {
2370 cFYI(1, "domainName is NULL");
2371 rc = PTR_ERR(key);
2372 goto out_err;
2373 }
2374
2375 /* didn't work, try to find a domain key */
2376 sprintf(desc, "cifs:d:%s", ses->domainName);
2377 cFYI(1, "%s: desc=%s", __func__, desc);
2378 key = request_key(&key_type_logon, desc, "");
2379 if (IS_ERR(key)) {
2380 rc = PTR_ERR(key);
2381 goto out_err;
2382 }
2383 }
2384
2385 down_read(&key->sem);
2386 upayload = key->payload.data;
2387 if (IS_ERR_OR_NULL(upayload)) {
2388 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2389 goto out_key_put;
2390 }
2391
2392 /* find first : in payload */
2393 payload = (char *)upayload->data;
2394 delim = strnchr(payload, upayload->datalen, ':');
2395 cFYI(1, "payload=%s", payload);
2396 if (!delim) {
2397 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2398 upayload->datalen);
2399 rc = -EINVAL;
2400 goto out_key_put;
2401 }
2402
2403 len = delim - payload;
2404 if (len > MAX_USERNAME_SIZE || len <= 0) {
2405 cFYI(1, "Bad value from username search (len=%zd)", len);
2406 rc = -EINVAL;
2407 goto out_key_put;
2408 }
2409
2410 vol->username = kstrndup(payload, len, GFP_KERNEL);
2411 if (!vol->username) {
2412 cFYI(1, "Unable to allocate %zd bytes for username", len);
2413 rc = -ENOMEM;
2414 goto out_key_put;
2415 }
2416 cFYI(1, "%s: username=%s", __func__, vol->username);
2417
2418 len = key->datalen - (len + 1);
2419 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2420 cFYI(1, "Bad len for password search (len=%zd)", len);
2421 rc = -EINVAL;
2422 kfree(vol->username);
2423 vol->username = NULL;
2424 goto out_key_put;
2425 }
2426
2427 ++delim;
2428 vol->password = kstrndup(delim, len, GFP_KERNEL);
2429 if (!vol->password) {
2430 cFYI(1, "Unable to allocate %zd bytes for password", len);
2431 rc = -ENOMEM;
2432 kfree(vol->username);
2433 vol->username = NULL;
2434 goto out_key_put;
2435 }
2436
2437 out_key_put:
2438 up_read(&key->sem);
2439 key_put(key);
2440 out_err:
2441 kfree(desc);
2442 cFYI(1, "%s: returning %d", __func__, rc);
2443 return rc;
2444 }
2445 #else /* ! CONFIG_KEYS */
2446 static inline int
2447 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2448 struct cifs_ses *ses __attribute__((unused)))
2449 {
2450 return -ENOSYS;
2451 }
2452 #endif /* CONFIG_KEYS */
2453
2454 static struct cifs_ses *
2455 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2456 {
2457 int rc = -ENOMEM;
2458 unsigned int xid;
2459 struct cifs_ses *ses;
2460 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2461 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2462
2463 xid = get_xid();
2464
2465 ses = cifs_find_smb_ses(server, volume_info);
2466 if (ses) {
2467 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2468
2469 mutex_lock(&ses->session_mutex);
2470 rc = cifs_negotiate_protocol(xid, ses);
2471 if (rc) {
2472 mutex_unlock(&ses->session_mutex);
2473 /* problem -- put our ses reference */
2474 cifs_put_smb_ses(ses);
2475 free_xid(xid);
2476 return ERR_PTR(rc);
2477 }
2478 if (ses->need_reconnect) {
2479 cFYI(1, "Session needs reconnect");
2480 rc = cifs_setup_session(xid, ses,
2481 volume_info->local_nls);
2482 if (rc) {
2483 mutex_unlock(&ses->session_mutex);
2484 /* problem -- put our reference */
2485 cifs_put_smb_ses(ses);
2486 free_xid(xid);
2487 return ERR_PTR(rc);
2488 }
2489 }
2490 mutex_unlock(&ses->session_mutex);
2491
2492 /* existing SMB ses has a server reference already */
2493 cifs_put_tcp_session(server);
2494 free_xid(xid);
2495 return ses;
2496 }
2497
2498 cFYI(1, "Existing smb sess not found");
2499 ses = sesInfoAlloc();
2500 if (ses == NULL)
2501 goto get_ses_fail;
2502
2503 /* new SMB session uses our server ref */
2504 ses->server = server;
2505 if (server->dstaddr.ss_family == AF_INET6)
2506 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2507 else
2508 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2509
2510 if (volume_info->username) {
2511 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2512 if (!ses->user_name)
2513 goto get_ses_fail;
2514 }
2515
2516 /* volume_info->password freed at unmount */
2517 if (volume_info->password) {
2518 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2519 if (!ses->password)
2520 goto get_ses_fail;
2521 }
2522 if (volume_info->domainname) {
2523 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2524 if (!ses->domainName)
2525 goto get_ses_fail;
2526 }
2527 ses->cred_uid = volume_info->cred_uid;
2528 ses->linux_uid = volume_info->linux_uid;
2529
2530 ses->overrideSecFlg = volume_info->secFlg;
2531
2532 mutex_lock(&ses->session_mutex);
2533 rc = cifs_negotiate_protocol(xid, ses);
2534 if (!rc)
2535 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2536 mutex_unlock(&ses->session_mutex);
2537 if (rc)
2538 goto get_ses_fail;
2539
2540 /* success, put it on the list */
2541 spin_lock(&cifs_tcp_ses_lock);
2542 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2543 spin_unlock(&cifs_tcp_ses_lock);
2544
2545 free_xid(xid);
2546 return ses;
2547
2548 get_ses_fail:
2549 sesInfoFree(ses);
2550 free_xid(xid);
2551 return ERR_PTR(rc);
2552 }
2553
2554 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2555 {
2556 if (tcon->tidStatus == CifsExiting)
2557 return 0;
2558 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2559 return 0;
2560 return 1;
2561 }
2562
2563 static struct cifs_tcon *
2564 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2565 {
2566 struct list_head *tmp;
2567 struct cifs_tcon *tcon;
2568
2569 spin_lock(&cifs_tcp_ses_lock);
2570 list_for_each(tmp, &ses->tcon_list) {
2571 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2572 if (!match_tcon(tcon, unc))
2573 continue;
2574 ++tcon->tc_count;
2575 spin_unlock(&cifs_tcp_ses_lock);
2576 return tcon;
2577 }
2578 spin_unlock(&cifs_tcp_ses_lock);
2579 return NULL;
2580 }
2581
2582 static void
2583 cifs_put_tcon(struct cifs_tcon *tcon)
2584 {
2585 unsigned int xid;
2586 struct cifs_ses *ses = tcon->ses;
2587
2588 cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
2589 spin_lock(&cifs_tcp_ses_lock);
2590 if (--tcon->tc_count > 0) {
2591 spin_unlock(&cifs_tcp_ses_lock);
2592 return;
2593 }
2594
2595 list_del_init(&tcon->tcon_list);
2596 spin_unlock(&cifs_tcp_ses_lock);
2597
2598 xid = get_xid();
2599 if (ses->server->ops->tree_disconnect)
2600 ses->server->ops->tree_disconnect(xid, tcon);
2601 _free_xid(xid);
2602
2603 cifs_fscache_release_super_cookie(tcon);
2604 tconInfoFree(tcon);
2605 cifs_put_smb_ses(ses);
2606 }
2607
2608 static struct cifs_tcon *
2609 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2610 {
2611 int rc, xid;
2612 struct cifs_tcon *tcon;
2613
2614 tcon = cifs_find_tcon(ses, volume_info->UNC);
2615 if (tcon) {
2616 cFYI(1, "Found match on UNC path");
2617 /* existing tcon already has a reference */
2618 cifs_put_smb_ses(ses);
2619 if (tcon->seal != volume_info->seal)
2620 cERROR(1, "transport encryption setting "
2621 "conflicts with existing tid");
2622 return tcon;
2623 }
2624
2625 if (!ses->server->ops->tree_connect) {
2626 rc = -ENOSYS;
2627 goto out_fail;
2628 }
2629
2630 tcon = tconInfoAlloc();
2631 if (tcon == NULL) {
2632 rc = -ENOMEM;
2633 goto out_fail;
2634 }
2635
2636 tcon->ses = ses;
2637 if (volume_info->password) {
2638 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2639 if (!tcon->password) {
2640 rc = -ENOMEM;
2641 goto out_fail;
2642 }
2643 }
2644
2645 /*
2646 * BB Do we need to wrap session_mutex around this TCon call and Unix
2647 * SetFS as we do on SessSetup and reconnect?
2648 */
2649 xid = get_xid();
2650 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2651 volume_info->local_nls);
2652 free_xid(xid);
2653 cFYI(1, "Tcon rc = %d", rc);
2654 if (rc)
2655 goto out_fail;
2656
2657 if (volume_info->nodfs) {
2658 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2659 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2660 }
2661 tcon->seal = volume_info->seal;
2662 /*
2663 * We can have only one retry value for a connection to a share so for
2664 * resources mounted more than once to the same server share the last
2665 * value passed in for the retry flag is used.
2666 */
2667 tcon->retry = volume_info->retry;
2668 tcon->nocase = volume_info->nocase;
2669 tcon->local_lease = volume_info->local_lease;
2670 INIT_LIST_HEAD(&tcon->pending_opens);
2671
2672 spin_lock(&cifs_tcp_ses_lock);
2673 list_add(&tcon->tcon_list, &ses->tcon_list);
2674 spin_unlock(&cifs_tcp_ses_lock);
2675
2676 cifs_fscache_get_super_cookie(tcon);
2677
2678 return tcon;
2679
2680 out_fail:
2681 tconInfoFree(tcon);
2682 return ERR_PTR(rc);
2683 }
2684
2685 void
2686 cifs_put_tlink(struct tcon_link *tlink)
2687 {
2688 if (!tlink || IS_ERR(tlink))
2689 return;
2690
2691 if (!atomic_dec_and_test(&tlink->tl_count) ||
2692 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2693 tlink->tl_time = jiffies;
2694 return;
2695 }
2696
2697 if (!IS_ERR(tlink_tcon(tlink)))
2698 cifs_put_tcon(tlink_tcon(tlink));
2699 kfree(tlink);
2700 return;
2701 }
2702
2703 static inline struct tcon_link *
2704 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2705 {
2706 return cifs_sb->master_tlink;
2707 }
2708
2709 static int
2710 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2711 {
2712 struct cifs_sb_info *old = CIFS_SB(sb);
2713 struct cifs_sb_info *new = mnt_data->cifs_sb;
2714
2715 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2716 return 0;
2717
2718 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2719 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2720 return 0;
2721
2722 /*
2723 * We want to share sb only if we don't specify an r/wsize or
2724 * specified r/wsize is greater than or equal to existing one.
2725 */
2726 if (new->wsize && new->wsize < old->wsize)
2727 return 0;
2728
2729 if (new->rsize && new->rsize < old->rsize)
2730 return 0;
2731
2732 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2733 return 0;
2734
2735 if (old->mnt_file_mode != new->mnt_file_mode ||
2736 old->mnt_dir_mode != new->mnt_dir_mode)
2737 return 0;
2738
2739 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2740 return 0;
2741
2742 if (old->actimeo != new->actimeo)
2743 return 0;
2744
2745 return 1;
2746 }
2747
2748 int
2749 cifs_match_super(struct super_block *sb, void *data)
2750 {
2751 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2752 struct smb_vol *volume_info;
2753 struct cifs_sb_info *cifs_sb;
2754 struct TCP_Server_Info *tcp_srv;
2755 struct cifs_ses *ses;
2756 struct cifs_tcon *tcon;
2757 struct tcon_link *tlink;
2758 int rc = 0;
2759
2760 spin_lock(&cifs_tcp_ses_lock);
2761 cifs_sb = CIFS_SB(sb);
2762 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2763 if (IS_ERR(tlink)) {
2764 spin_unlock(&cifs_tcp_ses_lock);
2765 return rc;
2766 }
2767 tcon = tlink_tcon(tlink);
2768 ses = tcon->ses;
2769 tcp_srv = ses->server;
2770
2771 volume_info = mnt_data->vol;
2772
2773 if (!match_server(tcp_srv, volume_info) ||
2774 !match_session(ses, volume_info) ||
2775 !match_tcon(tcon, volume_info->UNC)) {
2776 rc = 0;
2777 goto out;
2778 }
2779
2780 rc = compare_mount_options(sb, mnt_data);
2781 out:
2782 spin_unlock(&cifs_tcp_ses_lock);
2783 cifs_put_tlink(tlink);
2784 return rc;
2785 }
2786
2787 int
2788 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2789 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2790 struct dfs_info3_param **referrals, int remap)
2791 {
2792 char *temp_unc;
2793 int rc = 0;
2794
2795 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2796 return -ENOSYS;
2797
2798 *num_referrals = 0;
2799 *referrals = NULL;
2800
2801 if (ses->ipc_tid == 0) {
2802 temp_unc = kmalloc(2 /* for slashes */ +
2803 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2804 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2805 if (temp_unc == NULL)
2806 return -ENOMEM;
2807 temp_unc[0] = '\\';
2808 temp_unc[1] = '\\';
2809 strcpy(temp_unc + 2, ses->serverName);
2810 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2811 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2812 nls_codepage);
2813 cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
2814 kfree(temp_unc);
2815 }
2816 if (rc == 0)
2817 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2818 referrals, num_referrals,
2819 nls_codepage, remap);
2820 /*
2821 * BB - map targetUNCs to dfs_info3 structures, here or in
2822 * ses->server->ops->get_dfs_refer.
2823 */
2824
2825 return rc;
2826 }
2827
2828 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2829 static struct lock_class_key cifs_key[2];
2830 static struct lock_class_key cifs_slock_key[2];
2831
2832 static inline void
2833 cifs_reclassify_socket4(struct socket *sock)
2834 {
2835 struct sock *sk = sock->sk;
2836 BUG_ON(sock_owned_by_user(sk));
2837 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2838 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2839 }
2840
2841 static inline void
2842 cifs_reclassify_socket6(struct socket *sock)
2843 {
2844 struct sock *sk = sock->sk;
2845 BUG_ON(sock_owned_by_user(sk));
2846 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2847 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2848 }
2849 #else
2850 static inline void
2851 cifs_reclassify_socket4(struct socket *sock)
2852 {
2853 }
2854
2855 static inline void
2856 cifs_reclassify_socket6(struct socket *sock)
2857 {
2858 }
2859 #endif
2860
2861 /* See RFC1001 section 14 on representation of Netbios names */
2862 static void rfc1002mangle(char *target, char *source, unsigned int length)
2863 {
2864 unsigned int i, j;
2865
2866 for (i = 0, j = 0; i < (length); i++) {
2867 /* mask a nibble at a time and encode */
2868 target[j] = 'A' + (0x0F & (source[i] >> 4));
2869 target[j+1] = 'A' + (0x0F & source[i]);
2870 j += 2;
2871 }
2872
2873 }
2874
2875 static int
2876 bind_socket(struct TCP_Server_Info *server)
2877 {
2878 int rc = 0;
2879 if (server->srcaddr.ss_family != AF_UNSPEC) {
2880 /* Bind to the specified local IP address */
2881 struct socket *socket = server->ssocket;
2882 rc = socket->ops->bind(socket,
2883 (struct sockaddr *) &server->srcaddr,
2884 sizeof(server->srcaddr));
2885 if (rc < 0) {
2886 struct sockaddr_in *saddr4;
2887 struct sockaddr_in6 *saddr6;
2888 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2889 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2890 if (saddr6->sin6_family == AF_INET6)
2891 cERROR(1, "cifs: "
2892 "Failed to bind to: %pI6c, error: %d",
2893 &saddr6->sin6_addr, rc);
2894 else
2895 cERROR(1, "cifs: "
2896 "Failed to bind to: %pI4, error: %d",
2897 &saddr4->sin_addr.s_addr, rc);
2898 }
2899 }
2900 return rc;
2901 }
2902
2903 static int
2904 ip_rfc1001_connect(struct TCP_Server_Info *server)
2905 {
2906 int rc = 0;
2907 /*
2908 * some servers require RFC1001 sessinit before sending
2909 * negprot - BB check reconnection in case where second
2910 * sessinit is sent but no second negprot
2911 */
2912 struct rfc1002_session_packet *ses_init_buf;
2913 struct smb_hdr *smb_buf;
2914 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2915 GFP_KERNEL);
2916 if (ses_init_buf) {
2917 ses_init_buf->trailer.session_req.called_len = 32;
2918
2919 if (server->server_RFC1001_name &&
2920 server->server_RFC1001_name[0] != 0)
2921 rfc1002mangle(ses_init_buf->trailer.
2922 session_req.called_name,
2923 server->server_RFC1001_name,
2924 RFC1001_NAME_LEN_WITH_NULL);
2925 else
2926 rfc1002mangle(ses_init_buf->trailer.
2927 session_req.called_name,
2928 DEFAULT_CIFS_CALLED_NAME,
2929 RFC1001_NAME_LEN_WITH_NULL);
2930
2931 ses_init_buf->trailer.session_req.calling_len = 32;
2932
2933 /*
2934 * calling name ends in null (byte 16) from old smb
2935 * convention.
2936 */
2937 if (server->workstation_RFC1001_name &&
2938 server->workstation_RFC1001_name[0] != 0)
2939 rfc1002mangle(ses_init_buf->trailer.
2940 session_req.calling_name,
2941 server->workstation_RFC1001_name,
2942 RFC1001_NAME_LEN_WITH_NULL);
2943 else
2944 rfc1002mangle(ses_init_buf->trailer.
2945 session_req.calling_name,
2946 "LINUX_CIFS_CLNT",
2947 RFC1001_NAME_LEN_WITH_NULL);
2948
2949 ses_init_buf->trailer.session_req.scope1 = 0;
2950 ses_init_buf->trailer.session_req.scope2 = 0;
2951 smb_buf = (struct smb_hdr *)ses_init_buf;
2952
2953 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2954 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2955 rc = smb_send(server, smb_buf, 0x44);
2956 kfree(ses_init_buf);
2957 /*
2958 * RFC1001 layer in at least one server
2959 * requires very short break before negprot
2960 * presumably because not expecting negprot
2961 * to follow so fast. This is a simple
2962 * solution that works without
2963 * complicating the code and causes no
2964 * significant slowing down on mount
2965 * for everyone else
2966 */
2967 usleep_range(1000, 2000);
2968 }
2969 /*
2970 * else the negprot may still work without this
2971 * even though malloc failed
2972 */
2973
2974 return rc;
2975 }
2976
2977 static int
2978 generic_ip_connect(struct TCP_Server_Info *server)
2979 {
2980 int rc = 0;
2981 __be16 sport;
2982 int slen, sfamily;
2983 struct socket *socket = server->ssocket;
2984 struct sockaddr *saddr;
2985
2986 saddr = (struct sockaddr *) &server->dstaddr;
2987
2988 if (server->dstaddr.ss_family == AF_INET6) {
2989 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2990 slen = sizeof(struct sockaddr_in6);
2991 sfamily = AF_INET6;
2992 } else {
2993 sport = ((struct sockaddr_in *) saddr)->sin_port;
2994 slen = sizeof(struct sockaddr_in);
2995 sfamily = AF_INET;
2996 }
2997
2998 if (socket == NULL) {
2999 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3000 IPPROTO_TCP, &socket, 1);
3001 if (rc < 0) {
3002 cERROR(1, "Error %d creating socket", rc);
3003 server->ssocket = NULL;
3004 return rc;
3005 }
3006
3007 /* BB other socket options to set KEEPALIVE, NODELAY? */
3008 cFYI(1, "Socket created");
3009 server->ssocket = socket;
3010 socket->sk->sk_allocation = GFP_NOFS;
3011 if (sfamily == AF_INET6)
3012 cifs_reclassify_socket6(socket);
3013 else
3014 cifs_reclassify_socket4(socket);
3015 }
3016
3017 rc = bind_socket(server);
3018 if (rc < 0)
3019 return rc;
3020
3021 /*
3022 * Eventually check for other socket options to change from
3023 * the default. sock_setsockopt not used because it expects
3024 * user space buffer
3025 */
3026 socket->sk->sk_rcvtimeo = 7 * HZ;
3027 socket->sk->sk_sndtimeo = 5 * HZ;
3028
3029 /* make the bufsizes depend on wsize/rsize and max requests */
3030 if (server->noautotune) {
3031 if (socket->sk->sk_sndbuf < (200 * 1024))
3032 socket->sk->sk_sndbuf = 200 * 1024;
3033 if (socket->sk->sk_rcvbuf < (140 * 1024))
3034 socket->sk->sk_rcvbuf = 140 * 1024;
3035 }
3036
3037 if (server->tcp_nodelay) {
3038 int val = 1;
3039 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3040 (char *)&val, sizeof(val));
3041 if (rc)
3042 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3043 }
3044
3045 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3046 socket->sk->sk_sndbuf,
3047 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3048
3049 rc = socket->ops->connect(socket, saddr, slen, 0);
3050 if (rc < 0) {
3051 cFYI(1, "Error %d connecting to server", rc);
3052 sock_release(socket);
3053 server->ssocket = NULL;
3054 return rc;
3055 }
3056
3057 if (sport == htons(RFC1001_PORT))
3058 rc = ip_rfc1001_connect(server);
3059
3060 return rc;
3061 }
3062
3063 static int
3064 ip_connect(struct TCP_Server_Info *server)
3065 {
3066 __be16 *sport;
3067 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3068 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3069
3070 if (server->dstaddr.ss_family == AF_INET6)
3071 sport = &addr6->sin6_port;
3072 else
3073 sport = &addr->sin_port;
3074
3075 if (*sport == 0) {
3076 int rc;
3077
3078 /* try with 445 port at first */
3079 *sport = htons(CIFS_PORT);
3080
3081 rc = generic_ip_connect(server);
3082 if (rc >= 0)
3083 return rc;
3084
3085 /* if it failed, try with 139 port */
3086 *sport = htons(RFC1001_PORT);
3087 }
3088
3089 return generic_ip_connect(server);
3090 }
3091
3092 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3093 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3094 {
3095 /* if we are reconnecting then should we check to see if
3096 * any requested capabilities changed locally e.g. via
3097 * remount but we can not do much about it here
3098 * if they have (even if we could detect it by the following)
3099 * Perhaps we could add a backpointer to array of sb from tcon
3100 * or if we change to make all sb to same share the same
3101 * sb as NFS - then we only have one backpointer to sb.
3102 * What if we wanted to mount the server share twice once with
3103 * and once without posixacls or posix paths? */
3104 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3105
3106 if (vol_info && vol_info->no_linux_ext) {
3107 tcon->fsUnixInfo.Capability = 0;
3108 tcon->unix_ext = 0; /* Unix Extensions disabled */
3109 cFYI(1, "Linux protocol extensions disabled");
3110 return;
3111 } else if (vol_info)
3112 tcon->unix_ext = 1; /* Unix Extensions supported */
3113
3114 if (tcon->unix_ext == 0) {
3115 cFYI(1, "Unix extensions disabled so not set on reconnect");
3116 return;
3117 }
3118
3119 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3120 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3121 cFYI(1, "unix caps which server supports %lld", cap);
3122 /* check for reconnect case in which we do not
3123 want to change the mount behavior if we can avoid it */
3124 if (vol_info == NULL) {
3125 /* turn off POSIX ACL and PATHNAMES if not set
3126 originally at mount time */
3127 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3128 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3129 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3130 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3131 cERROR(1, "POSIXPATH support change");
3132 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3133 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3134 cERROR(1, "possible reconnect error");
3135 cERROR(1, "server disabled POSIX path support");
3136 }
3137 }
3138
3139 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3140 cERROR(1, "per-share encryption not supported yet");
3141
3142 cap &= CIFS_UNIX_CAP_MASK;
3143 if (vol_info && vol_info->no_psx_acl)
3144 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3145 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3146 cFYI(1, "negotiated posix acl support");
3147 if (cifs_sb)
3148 cifs_sb->mnt_cifs_flags |=
3149 CIFS_MOUNT_POSIXACL;
3150 }
3151
3152 if (vol_info && vol_info->posix_paths == 0)
3153 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3154 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3155 cFYI(1, "negotiate posix pathnames");
3156 if (cifs_sb)
3157 cifs_sb->mnt_cifs_flags |=
3158 CIFS_MOUNT_POSIX_PATHS;
3159 }
3160
3161 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3162 #ifdef CONFIG_CIFS_DEBUG2
3163 if (cap & CIFS_UNIX_FCNTL_CAP)
3164 cFYI(1, "FCNTL cap");
3165 if (cap & CIFS_UNIX_EXTATTR_CAP)
3166 cFYI(1, "EXTATTR cap");
3167 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3168 cFYI(1, "POSIX path cap");
3169 if (cap & CIFS_UNIX_XATTR_CAP)
3170 cFYI(1, "XATTR cap");
3171 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3172 cFYI(1, "POSIX ACL cap");
3173 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3174 cFYI(1, "very large read cap");
3175 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3176 cFYI(1, "very large write cap");
3177 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3178 cFYI(1, "transport encryption cap");
3179 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3180 cFYI(1, "mandatory transport encryption cap");
3181 #endif /* CIFS_DEBUG2 */
3182 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3183 if (vol_info == NULL) {
3184 cFYI(1, "resetting capabilities failed");
3185 } else
3186 cERROR(1, "Negotiating Unix capabilities "
3187 "with the server failed. Consider "
3188 "mounting with the Unix Extensions "
3189 "disabled if problems are found "
3190 "by specifying the nounix mount "
3191 "option.");
3192
3193 }
3194 }
3195 }
3196
3197 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3198 struct cifs_sb_info *cifs_sb)
3199 {
3200 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3201
3202 spin_lock_init(&cifs_sb->tlink_tree_lock);
3203 cifs_sb->tlink_tree = RB_ROOT;
3204
3205 /*
3206 * Temporarily set r/wsize for matching superblock. If we end up using
3207 * new sb then client will later negotiate it downward if needed.
3208 */
3209 cifs_sb->rsize = pvolume_info->rsize;
3210 cifs_sb->wsize = pvolume_info->wsize;
3211
3212 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3213 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3214 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3215 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3216 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3217 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3218
3219 cifs_sb->actimeo = pvolume_info->actimeo;
3220 cifs_sb->local_nls = pvolume_info->local_nls;
3221
3222 if (pvolume_info->noperm)
3223 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3224 if (pvolume_info->setuids)
3225 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3226 if (pvolume_info->server_ino)
3227 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3228 if (pvolume_info->remap)
3229 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3230 if (pvolume_info->no_xattr)
3231 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3232 if (pvolume_info->sfu_emul)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3234 if (pvolume_info->nobrl)
3235 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3236 if (pvolume_info->nostrictsync)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3238 if (pvolume_info->mand_lock)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3240 if (pvolume_info->rwpidforward)
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3242 if (pvolume_info->cifs_acl)
3243 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3244 if (pvolume_info->backupuid_specified) {
3245 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3246 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3247 }
3248 if (pvolume_info->backupgid_specified) {
3249 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3250 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3251 }
3252 if (pvolume_info->override_uid)
3253 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3254 if (pvolume_info->override_gid)
3255 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3256 if (pvolume_info->dynperm)
3257 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3258 if (pvolume_info->fsc)
3259 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3260 if (pvolume_info->multiuser)
3261 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3262 CIFS_MOUNT_NO_PERM);
3263 if (pvolume_info->strict_io)
3264 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3265 if (pvolume_info->direct_io) {
3266 cFYI(1, "mounting share using direct i/o");
3267 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3268 }
3269 if (pvolume_info->mfsymlinks) {
3270 if (pvolume_info->sfu_emul) {
3271 cERROR(1, "mount option mfsymlinks ignored if sfu "
3272 "mount option is used");
3273 } else {
3274 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3275 }
3276 }
3277
3278 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3279 cERROR(1, "mount option dynperm ignored if cifsacl "
3280 "mount option supported");
3281 }
3282
3283 static void
3284 cleanup_volume_info_contents(struct smb_vol *volume_info)
3285 {
3286 kfree(volume_info->username);
3287 kzfree(volume_info->password);
3288 kfree(volume_info->UNC);
3289 kfree(volume_info->domainname);
3290 kfree(volume_info->iocharset);
3291 kfree(volume_info->prepath);
3292 }
3293
3294 void
3295 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3296 {
3297 if (!volume_info)
3298 return;
3299 cleanup_volume_info_contents(volume_info);
3300 kfree(volume_info);
3301 }
3302
3303
3304 #ifdef CONFIG_CIFS_DFS_UPCALL
3305 /*
3306 * cifs_build_path_to_root returns full path to root when we do not have an
3307 * exiting connection (tcon)
3308 */
3309 static char *
3310 build_unc_path_to_root(const struct smb_vol *vol,
3311 const struct cifs_sb_info *cifs_sb)
3312 {
3313 char *full_path, *pos;
3314 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3315 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3316
3317 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3318 if (full_path == NULL)
3319 return ERR_PTR(-ENOMEM);
3320
3321 strncpy(full_path, vol->UNC, unc_len);
3322 pos = full_path + unc_len;
3323
3324 if (pplen) {
3325 *pos++ = CIFS_DIR_SEP(cifs_sb);
3326 strncpy(pos, vol->prepath, pplen);
3327 pos += pplen;
3328 }
3329
3330 *pos = '\0'; /* add trailing null */
3331 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3332 cFYI(1, "%s: full_path=%s", __func__, full_path);
3333 return full_path;
3334 }
3335
3336 /*
3337 * Perform a dfs referral query for a share and (optionally) prefix
3338 *
3339 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3340 * to a string containing updated options for the submount. Otherwise it
3341 * will be left untouched.
3342 *
3343 * Returns the rc from get_dfs_path to the caller, which can be used to
3344 * determine whether there were referrals.
3345 */
3346 static int
3347 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3348 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3349 int check_prefix)
3350 {
3351 int rc;
3352 unsigned int num_referrals = 0;
3353 struct dfs_info3_param *referrals = NULL;
3354 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3355
3356 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3357 if (IS_ERR(full_path))
3358 return PTR_ERR(full_path);
3359
3360 /* For DFS paths, skip the first '\' of the UNC */
3361 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3362
3363 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3364 &num_referrals, &referrals,
3365 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3366
3367 if (!rc && num_referrals > 0) {
3368 char *fake_devname = NULL;
3369
3370 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3371 full_path + 1, referrals,
3372 &fake_devname);
3373
3374 free_dfs_info_array(referrals, num_referrals);
3375
3376 if (IS_ERR(mdata)) {
3377 rc = PTR_ERR(mdata);
3378 mdata = NULL;
3379 } else {
3380 cleanup_volume_info_contents(volume_info);
3381 rc = cifs_setup_volume_info(volume_info, mdata,
3382 fake_devname);
3383 }
3384 kfree(fake_devname);
3385 kfree(cifs_sb->mountdata);
3386 cifs_sb->mountdata = mdata;
3387 }
3388 kfree(full_path);
3389 return rc;
3390 }
3391 #endif
3392
3393 static int
3394 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3395 const char *devname)
3396 {
3397 int rc = 0;
3398
3399 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3400 return -EINVAL;
3401
3402 if (volume_info->nullauth) {
3403 cFYI(1, "Anonymous login");
3404 kfree(volume_info->username);
3405 volume_info->username = NULL;
3406 } else if (volume_info->username) {
3407 /* BB fixme parse for domain name here */
3408 cFYI(1, "Username: %s", volume_info->username);
3409 } else {
3410 cifserror("No username specified");
3411 /* In userspace mount helper we can get user name from alternate
3412 locations such as env variables and files on disk */
3413 return -EINVAL;
3414 }
3415
3416 /* this is needed for ASCII cp to Unicode converts */
3417 if (volume_info->iocharset == NULL) {
3418 /* load_nls_default cannot return null */
3419 volume_info->local_nls = load_nls_default();
3420 } else {
3421 volume_info->local_nls = load_nls(volume_info->iocharset);
3422 if (volume_info->local_nls == NULL) {
3423 cERROR(1, "CIFS mount error: iocharset %s not found",
3424 volume_info->iocharset);
3425 return -ELIBACC;
3426 }
3427 }
3428
3429 return rc;
3430 }
3431
3432 struct smb_vol *
3433 cifs_get_volume_info(char *mount_data, const char *devname)
3434 {
3435 int rc;
3436 struct smb_vol *volume_info;
3437
3438 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3439 if (!volume_info)
3440 return ERR_PTR(-ENOMEM);
3441
3442 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3443 if (rc) {
3444 cifs_cleanup_volume_info(volume_info);
3445 volume_info = ERR_PTR(rc);
3446 }
3447
3448 return volume_info;
3449 }
3450
3451 int
3452 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3453 {
3454 int rc;
3455 unsigned int xid;
3456 struct cifs_ses *ses;
3457 struct cifs_tcon *tcon;
3458 struct TCP_Server_Info *server;
3459 char *full_path;
3460 struct tcon_link *tlink;
3461 #ifdef CONFIG_CIFS_DFS_UPCALL
3462 int referral_walks_count = 0;
3463 #endif
3464
3465 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3466 if (rc)
3467 return rc;
3468
3469 #ifdef CONFIG_CIFS_DFS_UPCALL
3470 try_mount_again:
3471 /* cleanup activities if we're chasing a referral */
3472 if (referral_walks_count) {
3473 if (tcon)
3474 cifs_put_tcon(tcon);
3475 else if (ses)
3476 cifs_put_smb_ses(ses);
3477
3478 free_xid(xid);
3479 }
3480 #endif
3481 rc = 0;
3482 tcon = NULL;
3483 ses = NULL;
3484 server = NULL;
3485 full_path = NULL;
3486 tlink = NULL;
3487
3488 xid = get_xid();
3489
3490 /* get a reference to a tcp session */
3491 server = cifs_get_tcp_session(volume_info);
3492 if (IS_ERR(server)) {
3493 rc = PTR_ERR(server);
3494 bdi_destroy(&cifs_sb->bdi);
3495 goto out;
3496 }
3497
3498 /* get a reference to a SMB session */
3499 ses = cifs_get_smb_ses(server, volume_info);
3500 if (IS_ERR(ses)) {
3501 rc = PTR_ERR(ses);
3502 ses = NULL;
3503 goto mount_fail_check;
3504 }
3505
3506 /* search for existing tcon to this server share */
3507 tcon = cifs_get_tcon(ses, volume_info);
3508 if (IS_ERR(tcon)) {
3509 rc = PTR_ERR(tcon);
3510 tcon = NULL;
3511 goto remote_path_check;
3512 }
3513
3514 /* tell server which Unix caps we support */
3515 if (cap_unix(tcon->ses)) {
3516 /* reset of caps checks mount to see if unix extensions
3517 disabled for just this mount */
3518 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3519 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3520 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3521 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3522 rc = -EACCES;
3523 goto mount_fail_check;
3524 }
3525 } else
3526 tcon->unix_ext = 0; /* server does not support them */
3527
3528 /* do not care if a following call succeed - informational */
3529 if (!tcon->ipc && server->ops->qfs_tcon)
3530 server->ops->qfs_tcon(xid, tcon);
3531
3532 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3533 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3534
3535 /* tune readahead according to rsize */
3536 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3537
3538 remote_path_check:
3539 #ifdef CONFIG_CIFS_DFS_UPCALL
3540 /*
3541 * Perform an unconditional check for whether there are DFS
3542 * referrals for this path without prefix, to provide support
3543 * for DFS referrals from w2k8 servers which don't seem to respond
3544 * with PATH_NOT_COVERED to requests that include the prefix.
3545 * Chase the referral if found, otherwise continue normally.
3546 */
3547 if (referral_walks_count == 0) {
3548 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3549 false);
3550 if (!refrc) {
3551 referral_walks_count++;
3552 goto try_mount_again;
3553 }
3554 }
3555 #endif
3556
3557 /* check if a whole path is not remote */
3558 if (!rc && tcon) {
3559 if (!server->ops->is_path_accessible) {
3560 rc = -ENOSYS;
3561 goto mount_fail_check;
3562 }
3563 /*
3564 * cifs_build_path_to_root works only when we have a valid tcon
3565 */
3566 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3567 if (full_path == NULL) {
3568 rc = -ENOMEM;
3569 goto mount_fail_check;
3570 }
3571 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3572 full_path);
3573 if (rc != 0 && rc != -EREMOTE) {
3574 kfree(full_path);
3575 goto mount_fail_check;
3576 }
3577 kfree(full_path);
3578 }
3579
3580 /* get referral if needed */
3581 if (rc == -EREMOTE) {
3582 #ifdef CONFIG_CIFS_DFS_UPCALL
3583 if (referral_walks_count > MAX_NESTED_LINKS) {
3584 /*
3585 * BB: when we implement proper loop detection,
3586 * we will remove this check. But now we need it
3587 * to prevent an indefinite loop if 'DFS tree' is
3588 * misconfigured (i.e. has loops).
3589 */
3590 rc = -ELOOP;
3591 goto mount_fail_check;
3592 }
3593
3594 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3595
3596 if (!rc) {
3597 referral_walks_count++;
3598 goto try_mount_again;
3599 }
3600 goto mount_fail_check;
3601 #else /* No DFS support, return error on mount */
3602 rc = -EOPNOTSUPP;
3603 #endif
3604 }
3605
3606 if (rc)
3607 goto mount_fail_check;
3608
3609 /* now, hang the tcon off of the superblock */
3610 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3611 if (tlink == NULL) {
3612 rc = -ENOMEM;
3613 goto mount_fail_check;
3614 }
3615
3616 tlink->tl_uid = ses->linux_uid;
3617 tlink->tl_tcon = tcon;
3618 tlink->tl_time = jiffies;
3619 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3620 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3621
3622 cifs_sb->master_tlink = tlink;
3623 spin_lock(&cifs_sb->tlink_tree_lock);
3624 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3625 spin_unlock(&cifs_sb->tlink_tree_lock);
3626
3627 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3628 TLINK_IDLE_EXPIRE);
3629
3630 mount_fail_check:
3631 /* on error free sesinfo and tcon struct if needed */
3632 if (rc) {
3633 /* If find_unc succeeded then rc == 0 so we can not end */
3634 /* up accidentally freeing someone elses tcon struct */
3635 if (tcon)
3636 cifs_put_tcon(tcon);
3637 else if (ses)
3638 cifs_put_smb_ses(ses);
3639 else
3640 cifs_put_tcp_session(server);
3641 bdi_destroy(&cifs_sb->bdi);
3642 }
3643
3644 out:
3645 free_xid(xid);
3646 return rc;
3647 }
3648
3649 /*
3650 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3651 * pointer may be NULL.
3652 */
3653 int
3654 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3655 const char *tree, struct cifs_tcon *tcon,
3656 const struct nls_table *nls_codepage)
3657 {
3658 struct smb_hdr *smb_buffer;
3659 struct smb_hdr *smb_buffer_response;
3660 TCONX_REQ *pSMB;
3661 TCONX_RSP *pSMBr;
3662 unsigned char *bcc_ptr;
3663 int rc = 0;
3664 int length;
3665 __u16 bytes_left, count;
3666
3667 if (ses == NULL)
3668 return -EIO;
3669
3670 smb_buffer = cifs_buf_get();
3671 if (smb_buffer == NULL)
3672 return -ENOMEM;
3673
3674 smb_buffer_response = smb_buffer;
3675
3676 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3677 NULL /*no tid */ , 4 /*wct */ );
3678
3679 smb_buffer->Mid = get_next_mid(ses->server);
3680 smb_buffer->Uid = ses->Suid;
3681 pSMB = (TCONX_REQ *) smb_buffer;
3682 pSMBr = (TCONX_RSP *) smb_buffer_response;
3683
3684 pSMB->AndXCommand = 0xFF;
3685 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3686 bcc_ptr = &pSMB->Password[0];
3687 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3688 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3689 *bcc_ptr = 0; /* password is null byte */
3690 bcc_ptr++; /* skip password */
3691 /* already aligned so no need to do it below */
3692 } else {
3693 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3694 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3695 specified as required (when that support is added to
3696 the vfs in the future) as only NTLM or the much
3697 weaker LANMAN (which we do not send by default) is accepted
3698 by Samba (not sure whether other servers allow
3699 NTLMv2 password here) */
3700 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3701 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3702 (ses->server->secType == LANMAN))
3703 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3704 ses->server->sec_mode &
3705 SECMODE_PW_ENCRYPT ? true : false,
3706 bcc_ptr);
3707 else
3708 #endif /* CIFS_WEAK_PW_HASH */
3709 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3710 bcc_ptr, nls_codepage);
3711
3712 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3713 if (ses->capabilities & CAP_UNICODE) {
3714 /* must align unicode strings */
3715 *bcc_ptr = 0; /* null byte password */
3716 bcc_ptr++;
3717 }
3718 }
3719
3720 if (ses->server->sec_mode &
3721 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3722 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3723
3724 if (ses->capabilities & CAP_STATUS32) {
3725 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3726 }
3727 if (ses->capabilities & CAP_DFS) {
3728 smb_buffer->Flags2 |= SMBFLG2_DFS;
3729 }
3730 if (ses->capabilities & CAP_UNICODE) {
3731 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3732 length =
3733 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3734 6 /* max utf8 char length in bytes */ *
3735 (/* server len*/ + 256 /* share len */), nls_codepage);
3736 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3737 bcc_ptr += 2; /* skip trailing null */
3738 } else { /* ASCII */
3739 strcpy(bcc_ptr, tree);
3740 bcc_ptr += strlen(tree) + 1;
3741 }
3742 strcpy(bcc_ptr, "?????");
3743 bcc_ptr += strlen("?????");
3744 bcc_ptr += 1;
3745 count = bcc_ptr - &pSMB->Password[0];
3746 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3747 pSMB->hdr.smb_buf_length) + count);
3748 pSMB->ByteCount = cpu_to_le16(count);
3749
3750 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3751 0);
3752
3753 /* above now done in SendReceive */
3754 if ((rc == 0) && (tcon != NULL)) {
3755 bool is_unicode;
3756
3757 tcon->tidStatus = CifsGood;
3758 tcon->need_reconnect = false;
3759 tcon->tid = smb_buffer_response->Tid;
3760 bcc_ptr = pByteArea(smb_buffer_response);
3761 bytes_left = get_bcc(smb_buffer_response);
3762 length = strnlen(bcc_ptr, bytes_left - 2);
3763 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3764 is_unicode = true;
3765 else
3766 is_unicode = false;
3767
3768
3769 /* skip service field (NB: this field is always ASCII) */
3770 if (length == 3) {
3771 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3772 (bcc_ptr[2] == 'C')) {
3773 cFYI(1, "IPC connection");
3774 tcon->ipc = 1;
3775 }
3776 } else if (length == 2) {
3777 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3778 /* the most common case */
3779 cFYI(1, "disk share connection");
3780 }
3781 }
3782 bcc_ptr += length + 1;
3783 bytes_left -= (length + 1);
3784 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3785
3786 /* mostly informational -- no need to fail on error here */
3787 kfree(tcon->nativeFileSystem);
3788 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3789 bytes_left, is_unicode,
3790 nls_codepage);
3791
3792 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3793
3794 if ((smb_buffer_response->WordCount == 3) ||
3795 (smb_buffer_response->WordCount == 7))
3796 /* field is in same location */
3797 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3798 else
3799 tcon->Flags = 0;
3800 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3801 } else if ((rc == 0) && tcon == NULL) {
3802 /* all we need to save for IPC$ connection */
3803 ses->ipc_tid = smb_buffer_response->Tid;
3804 }
3805
3806 cifs_buf_release(smb_buffer);
3807 return rc;
3808 }
3809
3810 void
3811 cifs_umount(struct cifs_sb_info *cifs_sb)
3812 {
3813 struct rb_root *root = &cifs_sb->tlink_tree;
3814 struct rb_node *node;
3815 struct tcon_link *tlink;
3816
3817 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3818
3819 spin_lock(&cifs_sb->tlink_tree_lock);
3820 while ((node = rb_first(root))) {
3821 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3822 cifs_get_tlink(tlink);
3823 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3824 rb_erase(node, root);
3825
3826 spin_unlock(&cifs_sb->tlink_tree_lock);
3827 cifs_put_tlink(tlink);
3828 spin_lock(&cifs_sb->tlink_tree_lock);
3829 }
3830 spin_unlock(&cifs_sb->tlink_tree_lock);
3831
3832 bdi_destroy(&cifs_sb->bdi);
3833 kfree(cifs_sb->mountdata);
3834 unload_nls(cifs_sb->local_nls);
3835 kfree(cifs_sb);
3836 }
3837
3838 int
3839 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3840 {
3841 int rc = 0;
3842 struct TCP_Server_Info *server = ses->server;
3843
3844 if (!server->ops->need_neg || !server->ops->negotiate)
3845 return -ENOSYS;
3846
3847 /* only send once per connect */
3848 if (!server->ops->need_neg(server))
3849 return 0;
3850
3851 set_credits(server, 1);
3852
3853 rc = server->ops->negotiate(xid, ses);
3854 if (rc == 0) {
3855 spin_lock(&GlobalMid_Lock);
3856 if (server->tcpStatus == CifsNeedNegotiate)
3857 server->tcpStatus = CifsGood;
3858 else
3859 rc = -EHOSTDOWN;
3860 spin_unlock(&GlobalMid_Lock);
3861 }
3862
3863 return rc;
3864 }
3865
3866 int
3867 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3868 struct nls_table *nls_info)
3869 {
3870 int rc = -ENOSYS;
3871 struct TCP_Server_Info *server = ses->server;
3872
3873 ses->flags = 0;
3874 ses->capabilities = server->capabilities;
3875 if (linuxExtEnabled == 0)
3876 ses->capabilities &= (~server->vals->cap_unix);
3877
3878 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3879 server->sec_mode, server->capabilities, server->timeAdj);
3880
3881 if (server->ops->sess_setup)
3882 rc = server->ops->sess_setup(xid, ses, nls_info);
3883
3884 if (rc) {
3885 cERROR(1, "Send error in SessSetup = %d", rc);
3886 } else {
3887 mutex_lock(&ses->server->srv_mutex);
3888 if (!server->session_estab) {
3889 server->session_key.response = ses->auth_key.response;
3890 server->session_key.len = ses->auth_key.len;
3891 server->sequence_number = 0x2;
3892 server->session_estab = true;
3893 ses->auth_key.response = NULL;
3894 }
3895 mutex_unlock(&server->srv_mutex);
3896
3897 cFYI(1, "CIFS Session Established successfully");
3898 spin_lock(&GlobalMid_Lock);
3899 ses->status = CifsGood;
3900 ses->need_reconnect = false;
3901 spin_unlock(&GlobalMid_Lock);
3902 }
3903
3904 kfree(ses->auth_key.response);
3905 ses->auth_key.response = NULL;
3906 ses->auth_key.len = 0;
3907 kfree(ses->ntlmssp);
3908 ses->ntlmssp = NULL;
3909
3910 return rc;
3911 }
3912
3913 static int
3914 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3915 {
3916 switch (ses->server->secType) {
3917 case Kerberos:
3918 vol->secFlg = CIFSSEC_MUST_KRB5;
3919 return 0;
3920 case NTLMv2:
3921 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3922 break;
3923 case NTLM:
3924 vol->secFlg = CIFSSEC_MUST_NTLM;
3925 break;
3926 case RawNTLMSSP:
3927 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3928 break;
3929 case LANMAN:
3930 vol->secFlg = CIFSSEC_MUST_LANMAN;
3931 break;
3932 }
3933
3934 return cifs_set_cifscreds(vol, ses);
3935 }
3936
3937 static struct cifs_tcon *
3938 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3939 {
3940 int rc;
3941 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3942 struct cifs_ses *ses;
3943 struct cifs_tcon *tcon = NULL;
3944 struct smb_vol *vol_info;
3945
3946 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3947 if (vol_info == NULL)
3948 return ERR_PTR(-ENOMEM);
3949
3950 vol_info->local_nls = cifs_sb->local_nls;
3951 vol_info->linux_uid = fsuid;
3952 vol_info->cred_uid = fsuid;
3953 vol_info->UNC = master_tcon->treeName;
3954 vol_info->retry = master_tcon->retry;
3955 vol_info->nocase = master_tcon->nocase;
3956 vol_info->local_lease = master_tcon->local_lease;
3957 vol_info->no_linux_ext = !master_tcon->unix_ext;
3958
3959 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3960 if (rc) {
3961 tcon = ERR_PTR(rc);
3962 goto out;
3963 }
3964
3965 /* get a reference for the same TCP session */
3966 spin_lock(&cifs_tcp_ses_lock);
3967 ++master_tcon->ses->server->srv_count;
3968 spin_unlock(&cifs_tcp_ses_lock);
3969
3970 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3971 if (IS_ERR(ses)) {
3972 tcon = (struct cifs_tcon *)ses;
3973 cifs_put_tcp_session(master_tcon->ses->server);
3974 goto out;
3975 }
3976
3977 tcon = cifs_get_tcon(ses, vol_info);
3978 if (IS_ERR(tcon)) {
3979 cifs_put_smb_ses(ses);
3980 goto out;
3981 }
3982
3983 if (cap_unix(ses))
3984 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3985 out:
3986 kfree(vol_info->username);
3987 kfree(vol_info->password);
3988 kfree(vol_info);
3989
3990 return tcon;
3991 }
3992
3993 struct cifs_tcon *
3994 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3995 {
3996 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3997 }
3998
3999 static int
4000 cifs_sb_tcon_pending_wait(void *unused)
4001 {
4002 schedule();
4003 return signal_pending(current) ? -ERESTARTSYS : 0;
4004 }
4005
4006 /* find and return a tlink with given uid */
4007 static struct tcon_link *
4008 tlink_rb_search(struct rb_root *root, kuid_t uid)
4009 {
4010 struct rb_node *node = root->rb_node;
4011 struct tcon_link *tlink;
4012
4013 while (node) {
4014 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4015
4016 if (uid_gt(tlink->tl_uid, uid))
4017 node = node->rb_left;
4018 else if (uid_lt(tlink->tl_uid, uid))
4019 node = node->rb_right;
4020 else
4021 return tlink;
4022 }
4023 return NULL;
4024 }
4025
4026 /* insert a tcon_link into the tree */
4027 static void
4028 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4029 {
4030 struct rb_node **new = &(root->rb_node), *parent = NULL;
4031 struct tcon_link *tlink;
4032
4033 while (*new) {
4034 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4035 parent = *new;
4036
4037 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4038 new = &((*new)->rb_left);
4039 else
4040 new = &((*new)->rb_right);
4041 }
4042
4043 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4044 rb_insert_color(&new_tlink->tl_rbnode, root);
4045 }
4046
4047 /*
4048 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4049 * current task.
4050 *
4051 * If the superblock doesn't refer to a multiuser mount, then just return
4052 * the master tcon for the mount.
4053 *
4054 * First, search the rbtree for an existing tcon for this fsuid. If one
4055 * exists, then check to see if it's pending construction. If it is then wait
4056 * for construction to complete. Once it's no longer pending, check to see if
4057 * it failed and either return an error or retry construction, depending on
4058 * the timeout.
4059 *
4060 * If one doesn't exist then insert a new tcon_link struct into the tree and
4061 * try to construct a new one.
4062 */
4063 struct tcon_link *
4064 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4065 {
4066 int ret;
4067 kuid_t fsuid = current_fsuid();
4068 struct tcon_link *tlink, *newtlink;
4069
4070 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4071 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4072
4073 spin_lock(&cifs_sb->tlink_tree_lock);
4074 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4075 if (tlink)
4076 cifs_get_tlink(tlink);
4077 spin_unlock(&cifs_sb->tlink_tree_lock);
4078
4079 if (tlink == NULL) {
4080 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4081 if (newtlink == NULL)
4082 return ERR_PTR(-ENOMEM);
4083 newtlink->tl_uid = fsuid;
4084 newtlink->tl_tcon = ERR_PTR(-EACCES);
4085 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4086 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4087 cifs_get_tlink(newtlink);
4088
4089 spin_lock(&cifs_sb->tlink_tree_lock);
4090 /* was one inserted after previous search? */
4091 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4092 if (tlink) {
4093 cifs_get_tlink(tlink);
4094 spin_unlock(&cifs_sb->tlink_tree_lock);
4095 kfree(newtlink);
4096 goto wait_for_construction;
4097 }
4098 tlink = newtlink;
4099 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4100 spin_unlock(&cifs_sb->tlink_tree_lock);
4101 } else {
4102 wait_for_construction:
4103 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4104 cifs_sb_tcon_pending_wait,
4105 TASK_INTERRUPTIBLE);
4106 if (ret) {
4107 cifs_put_tlink(tlink);
4108 return ERR_PTR(ret);
4109 }
4110
4111 /* if it's good, return it */
4112 if (!IS_ERR(tlink->tl_tcon))
4113 return tlink;
4114
4115 /* return error if we tried this already recently */
4116 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4117 cifs_put_tlink(tlink);
4118 return ERR_PTR(-EACCES);
4119 }
4120
4121 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4122 goto wait_for_construction;
4123 }
4124
4125 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4126 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4127 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4128
4129 if (IS_ERR(tlink->tl_tcon)) {
4130 cifs_put_tlink(tlink);
4131 return ERR_PTR(-EACCES);
4132 }
4133
4134 return tlink;
4135 }
4136
4137 /*
4138 * periodic workqueue job that scans tcon_tree for a superblock and closes
4139 * out tcons.
4140 */
4141 static void
4142 cifs_prune_tlinks(struct work_struct *work)
4143 {
4144 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4145 prune_tlinks.work);
4146 struct rb_root *root = &cifs_sb->tlink_tree;
4147 struct rb_node *node = rb_first(root);
4148 struct rb_node *tmp;
4149 struct tcon_link *tlink;
4150
4151 /*
4152 * Because we drop the spinlock in the loop in order to put the tlink
4153 * it's not guarded against removal of links from the tree. The only
4154 * places that remove entries from the tree are this function and
4155 * umounts. Because this function is non-reentrant and is canceled
4156 * before umount can proceed, this is safe.
4157 */
4158 spin_lock(&cifs_sb->tlink_tree_lock);
4159 node = rb_first(root);
4160 while (node != NULL) {
4161 tmp = node;
4162 node = rb_next(tmp);
4163 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4164
4165 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4166 atomic_read(&tlink->tl_count) != 0 ||
4167 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4168 continue;
4169
4170 cifs_get_tlink(tlink);
4171 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4172 rb_erase(tmp, root);
4173
4174 spin_unlock(&cifs_sb->tlink_tree_lock);
4175 cifs_put_tlink(tlink);
4176 spin_lock(&cifs_sb->tlink_tree_lock);
4177 }
4178 spin_unlock(&cifs_sb->tlink_tree_lock);
4179
4180 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4181 TLINK_IDLE_EXPIRE);
4182 }
Linus' kernel tree