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Merge branch 'drm-nouveau-fixes' of git://anongit.freedesktop.org/git/nouveau/linux...
[deliverable/linux.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
42 #include <net/ipv6.h>
43 #include <linux/parser.h>
44
45 #include "cifspdu.h"
46 #include "cifsglob.h"
47 #include "cifsproto.h"
48 #include "cifs_unicode.h"
49 #include "cifs_debug.h"
50 #include "cifs_fs_sb.h"
51 #include "ntlmssp.h"
52 #include "nterr.h"
53 #include "rfc1002pdu.h"
54 #include "fscache.h"
55
56 #define CIFS_PORT 445
57 #define RFC1001_PORT 139
58
59 extern mempool_t *cifs_req_poolp;
60
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
64
65 enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_noblocksend, Opt_noautotune,
71 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
72 Opt_mapchars, Opt_nomapchars, Opt_sfu,
73 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
74 Opt_noposixpaths, Opt_nounix,
75 Opt_nocase,
76 Opt_brl, Opt_nobrl,
77 Opt_forcemandatorylock, Opt_setuids,
78 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
79 Opt_nohard, Opt_nosoft,
80 Opt_nointr, Opt_intr,
81 Opt_nostrictsync, Opt_strictsync,
82 Opt_serverino, Opt_noserverino,
83 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
84 Opt_acl, Opt_noacl, Opt_locallease,
85 Opt_sign, Opt_seal, Opt_noac,
86 Opt_fsc, Opt_mfsymlinks,
87 Opt_multiuser, Opt_sloppy,
88
89 /* Mount options which take numeric value */
90 Opt_backupuid, Opt_backupgid, Opt_uid,
91 Opt_cruid, Opt_gid, Opt_file_mode,
92 Opt_dirmode, Opt_port,
93 Opt_rsize, Opt_wsize, Opt_actimeo,
94
95 /* Mount options which take string value */
96 Opt_user, Opt_pass, Opt_ip,
97 Opt_unc, Opt_domain,
98 Opt_srcaddr, Opt_prefixpath,
99 Opt_iocharset, Opt_sockopt,
100 Opt_netbiosname, Opt_servern,
101 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
102
103 /* Mount options to be ignored */
104 Opt_ignore,
105
106 /* Options which could be blank */
107 Opt_blank_pass,
108 Opt_blank_user,
109 Opt_blank_ip,
110
111 Opt_err
112 };
113
114 static const match_table_t cifs_mount_option_tokens = {
115
116 { Opt_user_xattr, "user_xattr" },
117 { Opt_nouser_xattr, "nouser_xattr" },
118 { Opt_forceuid, "forceuid" },
119 { Opt_noforceuid, "noforceuid" },
120 { Opt_noblocksend, "noblocksend" },
121 { Opt_noautotune, "noautotune" },
122 { Opt_hard, "hard" },
123 { Opt_soft, "soft" },
124 { Opt_perm, "perm" },
125 { Opt_noperm, "noperm" },
126 { Opt_mapchars, "mapchars" },
127 { Opt_nomapchars, "nomapchars" },
128 { Opt_sfu, "sfu" },
129 { Opt_nosfu, "nosfu" },
130 { Opt_nodfs, "nodfs" },
131 { Opt_posixpaths, "posixpaths" },
132 { Opt_noposixpaths, "noposixpaths" },
133 { Opt_nounix, "nounix" },
134 { Opt_nounix, "nolinux" },
135 { Opt_nocase, "nocase" },
136 { Opt_nocase, "ignorecase" },
137 { Opt_brl, "brl" },
138 { Opt_nobrl, "nobrl" },
139 { Opt_nobrl, "nolock" },
140 { Opt_forcemandatorylock, "forcemandatorylock" },
141 { Opt_forcemandatorylock, "forcemand" },
142 { Opt_setuids, "setuids" },
143 { Opt_nosetuids, "nosetuids" },
144 { Opt_dynperm, "dynperm" },
145 { Opt_nodynperm, "nodynperm" },
146 { Opt_nohard, "nohard" },
147 { Opt_nosoft, "nosoft" },
148 { Opt_nointr, "nointr" },
149 { Opt_intr, "intr" },
150 { Opt_nostrictsync, "nostrictsync" },
151 { Opt_strictsync, "strictsync" },
152 { Opt_serverino, "serverino" },
153 { Opt_noserverino, "noserverino" },
154 { Opt_rwpidforward, "rwpidforward" },
155 { Opt_cifsacl, "cifsacl" },
156 { Opt_nocifsacl, "nocifsacl" },
157 { Opt_acl, "acl" },
158 { Opt_noacl, "noacl" },
159 { Opt_locallease, "locallease" },
160 { Opt_sign, "sign" },
161 { Opt_seal, "seal" },
162 { Opt_noac, "noac" },
163 { Opt_fsc, "fsc" },
164 { Opt_mfsymlinks, "mfsymlinks" },
165 { Opt_multiuser, "multiuser" },
166 { Opt_sloppy, "sloppy" },
167
168 { Opt_backupuid, "backupuid=%s" },
169 { Opt_backupgid, "backupgid=%s" },
170 { Opt_uid, "uid=%s" },
171 { Opt_cruid, "cruid=%s" },
172 { Opt_gid, "gid=%s" },
173 { Opt_file_mode, "file_mode=%s" },
174 { Opt_dirmode, "dirmode=%s" },
175 { Opt_dirmode, "dir_mode=%s" },
176 { Opt_port, "port=%s" },
177 { Opt_rsize, "rsize=%s" },
178 { Opt_wsize, "wsize=%s" },
179 { Opt_actimeo, "actimeo=%s" },
180
181 { Opt_blank_user, "user=" },
182 { Opt_blank_user, "username=" },
183 { Opt_user, "user=%s" },
184 { Opt_user, "username=%s" },
185 { Opt_blank_pass, "pass=" },
186 { Opt_pass, "pass=%s" },
187 { Opt_pass, "password=%s" },
188 { Opt_blank_ip, "ip=" },
189 { Opt_blank_ip, "addr=" },
190 { Opt_ip, "ip=%s" },
191 { Opt_ip, "addr=%s" },
192 { Opt_unc, "unc=%s" },
193 { Opt_unc, "target=%s" },
194 { Opt_unc, "path=%s" },
195 { Opt_domain, "dom=%s" },
196 { Opt_domain, "domain=%s" },
197 { Opt_domain, "workgroup=%s" },
198 { Opt_srcaddr, "srcaddr=%s" },
199 { Opt_prefixpath, "prefixpath=%s" },
200 { Opt_iocharset, "iocharset=%s" },
201 { Opt_sockopt, "sockopt=%s" },
202 { Opt_netbiosname, "netbiosname=%s" },
203 { Opt_servern, "servern=%s" },
204 { Opt_ver, "ver=%s" },
205 { Opt_vers, "vers=%s" },
206 { Opt_sec, "sec=%s" },
207 { Opt_cache, "cache=%s" },
208
209 { Opt_ignore, "cred" },
210 { Opt_ignore, "credentials" },
211 { Opt_ignore, "cred=%s" },
212 { Opt_ignore, "credentials=%s" },
213 { Opt_ignore, "guest" },
214 { Opt_ignore, "rw" },
215 { Opt_ignore, "ro" },
216 { Opt_ignore, "suid" },
217 { Opt_ignore, "nosuid" },
218 { Opt_ignore, "exec" },
219 { Opt_ignore, "noexec" },
220 { Opt_ignore, "nodev" },
221 { Opt_ignore, "noauto" },
222 { Opt_ignore, "dev" },
223 { Opt_ignore, "mand" },
224 { Opt_ignore, "nomand" },
225 { Opt_ignore, "_netdev" },
226
227 { Opt_err, NULL }
228 };
229
230 enum {
231 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
232 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
233 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
234 Opt_sec_ntlmv2i, Opt_sec_lanman,
235 Opt_sec_none,
236
237 Opt_sec_err
238 };
239
240 static const match_table_t cifs_secflavor_tokens = {
241 { Opt_sec_krb5, "krb5" },
242 { Opt_sec_krb5i, "krb5i" },
243 { Opt_sec_krb5p, "krb5p" },
244 { Opt_sec_ntlmsspi, "ntlmsspi" },
245 { Opt_sec_ntlmssp, "ntlmssp" },
246 { Opt_ntlm, "ntlm" },
247 { Opt_sec_ntlmi, "ntlmi" },
248 { Opt_sec_ntlmv2, "nontlm" },
249 { Opt_sec_ntlmv2, "ntlmv2" },
250 { Opt_sec_ntlmv2i, "ntlmv2i" },
251 { Opt_sec_lanman, "lanman" },
252 { Opt_sec_none, "none" },
253
254 { Opt_sec_err, NULL }
255 };
256
257 /* cache flavors */
258 enum {
259 Opt_cache_loose,
260 Opt_cache_strict,
261 Opt_cache_none,
262 Opt_cache_err
263 };
264
265 static const match_table_t cifs_cacheflavor_tokens = {
266 { Opt_cache_loose, "loose" },
267 { Opt_cache_strict, "strict" },
268 { Opt_cache_none, "none" },
269 { Opt_cache_err, NULL }
270 };
271
272 static const match_table_t cifs_smb_version_tokens = {
273 { Smb_1, SMB1_VERSION_STRING },
274 { Smb_21, SMB21_VERSION_STRING },
275 { Smb_30, SMB30_VERSION_STRING },
276 };
277
278 static int ip_connect(struct TCP_Server_Info *server);
279 static int generic_ip_connect(struct TCP_Server_Info *server);
280 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
281 static void cifs_prune_tlinks(struct work_struct *work);
282 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
283 const char *devname);
284
285 /*
286 * cifs tcp session reconnection
287 *
288 * mark tcp session as reconnecting so temporarily locked
289 * mark all smb sessions as reconnecting for tcp session
290 * reconnect tcp session
291 * wake up waiters on reconnection? - (not needed currently)
292 */
293 int
294 cifs_reconnect(struct TCP_Server_Info *server)
295 {
296 int rc = 0;
297 struct list_head *tmp, *tmp2;
298 struct cifs_ses *ses;
299 struct cifs_tcon *tcon;
300 struct mid_q_entry *mid_entry;
301 struct list_head retry_list;
302
303 spin_lock(&GlobalMid_Lock);
304 if (server->tcpStatus == CifsExiting) {
305 /* the demux thread will exit normally
306 next time through the loop */
307 spin_unlock(&GlobalMid_Lock);
308 return rc;
309 } else
310 server->tcpStatus = CifsNeedReconnect;
311 spin_unlock(&GlobalMid_Lock);
312 server->maxBuf = 0;
313 #ifdef CONFIG_CIFS_SMB2
314 server->max_read = 0;
315 #endif
316
317 cFYI(1, "Reconnecting tcp session");
318
319 /* before reconnecting the tcp session, mark the smb session (uid)
320 and the tid bad so they are not used until reconnected */
321 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
322 spin_lock(&cifs_tcp_ses_lock);
323 list_for_each(tmp, &server->smb_ses_list) {
324 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
325 ses->need_reconnect = true;
326 ses->ipc_tid = 0;
327 list_for_each(tmp2, &ses->tcon_list) {
328 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
329 tcon->need_reconnect = true;
330 }
331 }
332 spin_unlock(&cifs_tcp_ses_lock);
333
334 /* do not want to be sending data on a socket we are freeing */
335 cFYI(1, "%s: tearing down socket", __func__);
336 mutex_lock(&server->srv_mutex);
337 if (server->ssocket) {
338 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
339 server->ssocket->flags);
340 kernel_sock_shutdown(server->ssocket, SHUT_WR);
341 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
342 server->ssocket->state,
343 server->ssocket->flags);
344 sock_release(server->ssocket);
345 server->ssocket = NULL;
346 }
347 server->sequence_number = 0;
348 server->session_estab = false;
349 kfree(server->session_key.response);
350 server->session_key.response = NULL;
351 server->session_key.len = 0;
352 server->lstrp = jiffies;
353 mutex_unlock(&server->srv_mutex);
354
355 /* mark submitted MIDs for retry and issue callback */
356 INIT_LIST_HEAD(&retry_list);
357 cFYI(1, "%s: moving mids to private list", __func__);
358 spin_lock(&GlobalMid_Lock);
359 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
360 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
361 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
362 mid_entry->mid_state = MID_RETRY_NEEDED;
363 list_move(&mid_entry->qhead, &retry_list);
364 }
365 spin_unlock(&GlobalMid_Lock);
366
367 cFYI(1, "%s: issuing mid callbacks", __func__);
368 list_for_each_safe(tmp, tmp2, &retry_list) {
369 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
370 list_del_init(&mid_entry->qhead);
371 mid_entry->callback(mid_entry);
372 }
373
374 do {
375 try_to_freeze();
376
377 /* we should try only the port we connected to before */
378 rc = generic_ip_connect(server);
379 if (rc) {
380 cFYI(1, "reconnect error %d", rc);
381 msleep(3000);
382 } else {
383 atomic_inc(&tcpSesReconnectCount);
384 spin_lock(&GlobalMid_Lock);
385 if (server->tcpStatus != CifsExiting)
386 server->tcpStatus = CifsNeedNegotiate;
387 spin_unlock(&GlobalMid_Lock);
388 }
389 } while (server->tcpStatus == CifsNeedReconnect);
390
391 return rc;
392 }
393
394 static void
395 cifs_echo_request(struct work_struct *work)
396 {
397 int rc;
398 struct TCP_Server_Info *server = container_of(work,
399 struct TCP_Server_Info, echo.work);
400
401 /*
402 * We cannot send an echo if it is disabled or until the
403 * NEGOTIATE_PROTOCOL request is done, which is indicated by
404 * server->ops->need_neg() == true. Also, no need to ping if
405 * we got a response recently.
406 */
407 if (!server->ops->need_neg || server->ops->need_neg(server) ||
408 (server->ops->can_echo && !server->ops->can_echo(server)) ||
409 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
410 goto requeue_echo;
411
412 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
413 if (rc)
414 cFYI(1, "Unable to send echo request to server: %s",
415 server->hostname);
416
417 requeue_echo:
418 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
419 }
420
421 static bool
422 allocate_buffers(struct TCP_Server_Info *server)
423 {
424 if (!server->bigbuf) {
425 server->bigbuf = (char *)cifs_buf_get();
426 if (!server->bigbuf) {
427 cERROR(1, "No memory for large SMB response");
428 msleep(3000);
429 /* retry will check if exiting */
430 return false;
431 }
432 } else if (server->large_buf) {
433 /* we are reusing a dirty large buf, clear its start */
434 memset(server->bigbuf, 0, HEADER_SIZE(server));
435 }
436
437 if (!server->smallbuf) {
438 server->smallbuf = (char *)cifs_small_buf_get();
439 if (!server->smallbuf) {
440 cERROR(1, "No memory for SMB response");
441 msleep(1000);
442 /* retry will check if exiting */
443 return false;
444 }
445 /* beginning of smb buffer is cleared in our buf_get */
446 } else {
447 /* if existing small buf clear beginning */
448 memset(server->smallbuf, 0, HEADER_SIZE(server));
449 }
450
451 return true;
452 }
453
454 static bool
455 server_unresponsive(struct TCP_Server_Info *server)
456 {
457 /*
458 * We need to wait 2 echo intervals to make sure we handle such
459 * situations right:
460 * 1s client sends a normal SMB request
461 * 2s client gets a response
462 * 30s echo workqueue job pops, and decides we got a response recently
463 * and don't need to send another
464 * ...
465 * 65s kernel_recvmsg times out, and we see that we haven't gotten
466 * a response in >60s.
467 */
468 if (server->tcpStatus == CifsGood &&
469 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
470 cERROR(1, "Server %s has not responded in %d seconds. "
471 "Reconnecting...", server->hostname,
472 (2 * SMB_ECHO_INTERVAL) / HZ);
473 cifs_reconnect(server);
474 wake_up(&server->response_q);
475 return true;
476 }
477
478 return false;
479 }
480
481 /*
482 * kvec_array_init - clone a kvec array, and advance into it
483 * @new: pointer to memory for cloned array
484 * @iov: pointer to original array
485 * @nr_segs: number of members in original array
486 * @bytes: number of bytes to advance into the cloned array
487 *
488 * This function will copy the array provided in iov to a section of memory
489 * and advance the specified number of bytes into the new array. It returns
490 * the number of segments in the new array. "new" must be at least as big as
491 * the original iov array.
492 */
493 static unsigned int
494 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
495 size_t bytes)
496 {
497 size_t base = 0;
498
499 while (bytes || !iov->iov_len) {
500 int copy = min(bytes, iov->iov_len);
501
502 bytes -= copy;
503 base += copy;
504 if (iov->iov_len == base) {
505 iov++;
506 nr_segs--;
507 base = 0;
508 }
509 }
510 memcpy(new, iov, sizeof(*iov) * nr_segs);
511 new->iov_base += base;
512 new->iov_len -= base;
513 return nr_segs;
514 }
515
516 static struct kvec *
517 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
518 {
519 struct kvec *new_iov;
520
521 if (server->iov && nr_segs <= server->nr_iov)
522 return server->iov;
523
524 /* not big enough -- allocate a new one and release the old */
525 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
526 if (new_iov) {
527 kfree(server->iov);
528 server->iov = new_iov;
529 server->nr_iov = nr_segs;
530 }
531 return new_iov;
532 }
533
534 int
535 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
536 unsigned int nr_segs, unsigned int to_read)
537 {
538 int length = 0;
539 int total_read;
540 unsigned int segs;
541 struct msghdr smb_msg;
542 struct kvec *iov;
543
544 iov = get_server_iovec(server, nr_segs);
545 if (!iov)
546 return -ENOMEM;
547
548 smb_msg.msg_control = NULL;
549 smb_msg.msg_controllen = 0;
550
551 for (total_read = 0; to_read; total_read += length, to_read -= length) {
552 try_to_freeze();
553
554 if (server_unresponsive(server)) {
555 total_read = -EAGAIN;
556 break;
557 }
558
559 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
560
561 length = kernel_recvmsg(server->ssocket, &smb_msg,
562 iov, segs, to_read, 0);
563
564 if (server->tcpStatus == CifsExiting) {
565 total_read = -ESHUTDOWN;
566 break;
567 } else if (server->tcpStatus == CifsNeedReconnect) {
568 cifs_reconnect(server);
569 total_read = -EAGAIN;
570 break;
571 } else if (length == -ERESTARTSYS ||
572 length == -EAGAIN ||
573 length == -EINTR) {
574 /*
575 * Minimum sleep to prevent looping, allowing socket
576 * to clear and app threads to set tcpStatus
577 * CifsNeedReconnect if server hung.
578 */
579 usleep_range(1000, 2000);
580 length = 0;
581 continue;
582 } else if (length <= 0) {
583 cFYI(1, "Received no data or error: expecting %d "
584 "got %d", to_read, length);
585 cifs_reconnect(server);
586 total_read = -EAGAIN;
587 break;
588 }
589 }
590 return total_read;
591 }
592
593 int
594 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
595 unsigned int to_read)
596 {
597 struct kvec iov;
598
599 iov.iov_base = buf;
600 iov.iov_len = to_read;
601
602 return cifs_readv_from_socket(server, &iov, 1, to_read);
603 }
604
605 static bool
606 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
607 {
608 /*
609 * The first byte big endian of the length field,
610 * is actually not part of the length but the type
611 * with the most common, zero, as regular data.
612 */
613 switch (type) {
614 case RFC1002_SESSION_MESSAGE:
615 /* Regular SMB response */
616 return true;
617 case RFC1002_SESSION_KEEP_ALIVE:
618 cFYI(1, "RFC 1002 session keep alive");
619 break;
620 case RFC1002_POSITIVE_SESSION_RESPONSE:
621 cFYI(1, "RFC 1002 positive session response");
622 break;
623 case RFC1002_NEGATIVE_SESSION_RESPONSE:
624 /*
625 * We get this from Windows 98 instead of an error on
626 * SMB negprot response.
627 */
628 cFYI(1, "RFC 1002 negative session response");
629 /* give server a second to clean up */
630 msleep(1000);
631 /*
632 * Always try 445 first on reconnect since we get NACK
633 * on some if we ever connected to port 139 (the NACK
634 * is since we do not begin with RFC1001 session
635 * initialize frame).
636 */
637 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
638 cifs_reconnect(server);
639 wake_up(&server->response_q);
640 break;
641 default:
642 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
643 cifs_reconnect(server);
644 }
645
646 return false;
647 }
648
649 void
650 dequeue_mid(struct mid_q_entry *mid, bool malformed)
651 {
652 #ifdef CONFIG_CIFS_STATS2
653 mid->when_received = jiffies;
654 #endif
655 spin_lock(&GlobalMid_Lock);
656 if (!malformed)
657 mid->mid_state = MID_RESPONSE_RECEIVED;
658 else
659 mid->mid_state = MID_RESPONSE_MALFORMED;
660 list_del_init(&mid->qhead);
661 spin_unlock(&GlobalMid_Lock);
662 }
663
664 static void
665 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
666 char *buf, int malformed)
667 {
668 if (server->ops->check_trans2 &&
669 server->ops->check_trans2(mid, server, buf, malformed))
670 return;
671 mid->resp_buf = buf;
672 mid->large_buf = server->large_buf;
673 /* Was previous buf put in mpx struct for multi-rsp? */
674 if (!mid->multiRsp) {
675 /* smb buffer will be freed by user thread */
676 if (server->large_buf)
677 server->bigbuf = NULL;
678 else
679 server->smallbuf = NULL;
680 }
681 dequeue_mid(mid, malformed);
682 }
683
684 static void clean_demultiplex_info(struct TCP_Server_Info *server)
685 {
686 int length;
687
688 /* take it off the list, if it's not already */
689 spin_lock(&cifs_tcp_ses_lock);
690 list_del_init(&server->tcp_ses_list);
691 spin_unlock(&cifs_tcp_ses_lock);
692
693 spin_lock(&GlobalMid_Lock);
694 server->tcpStatus = CifsExiting;
695 spin_unlock(&GlobalMid_Lock);
696 wake_up_all(&server->response_q);
697
698 /* check if we have blocked requests that need to free */
699 spin_lock(&server->req_lock);
700 if (server->credits <= 0)
701 server->credits = 1;
702 spin_unlock(&server->req_lock);
703 /*
704 * Although there should not be any requests blocked on this queue it
705 * can not hurt to be paranoid and try to wake up requests that may
706 * haven been blocked when more than 50 at time were on the wire to the
707 * same server - they now will see the session is in exit state and get
708 * out of SendReceive.
709 */
710 wake_up_all(&server->request_q);
711 /* give those requests time to exit */
712 msleep(125);
713
714 if (server->ssocket) {
715 sock_release(server->ssocket);
716 server->ssocket = NULL;
717 }
718
719 if (!list_empty(&server->pending_mid_q)) {
720 struct list_head dispose_list;
721 struct mid_q_entry *mid_entry;
722 struct list_head *tmp, *tmp2;
723
724 INIT_LIST_HEAD(&dispose_list);
725 spin_lock(&GlobalMid_Lock);
726 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
727 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
728 cFYI(1, "Clearing mid 0x%llx", mid_entry->mid);
729 mid_entry->mid_state = MID_SHUTDOWN;
730 list_move(&mid_entry->qhead, &dispose_list);
731 }
732 spin_unlock(&GlobalMid_Lock);
733
734 /* now walk dispose list and issue callbacks */
735 list_for_each_safe(tmp, tmp2, &dispose_list) {
736 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
737 cFYI(1, "Callback mid 0x%llx", mid_entry->mid);
738 list_del_init(&mid_entry->qhead);
739 mid_entry->callback(mid_entry);
740 }
741 /* 1/8th of sec is more than enough time for them to exit */
742 msleep(125);
743 }
744
745 if (!list_empty(&server->pending_mid_q)) {
746 /*
747 * mpx threads have not exited yet give them at least the smb
748 * send timeout time for long ops.
749 *
750 * Due to delays on oplock break requests, we need to wait at
751 * least 45 seconds before giving up on a request getting a
752 * response and going ahead and killing cifsd.
753 */
754 cFYI(1, "Wait for exit from demultiplex thread");
755 msleep(46000);
756 /*
757 * If threads still have not exited they are probably never
758 * coming home not much else we can do but free the memory.
759 */
760 }
761
762 kfree(server->hostname);
763 kfree(server->iov);
764 kfree(server);
765
766 length = atomic_dec_return(&tcpSesAllocCount);
767 if (length > 0)
768 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
769 GFP_KERNEL);
770 }
771
772 static int
773 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
774 {
775 int length;
776 char *buf = server->smallbuf;
777 unsigned int pdu_length = get_rfc1002_length(buf);
778
779 /* make sure this will fit in a large buffer */
780 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
781 cERROR(1, "SMB response too long (%u bytes)",
782 pdu_length);
783 cifs_reconnect(server);
784 wake_up(&server->response_q);
785 return -EAGAIN;
786 }
787
788 /* switch to large buffer if too big for a small one */
789 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
790 server->large_buf = true;
791 memcpy(server->bigbuf, buf, server->total_read);
792 buf = server->bigbuf;
793 }
794
795 /* now read the rest */
796 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
797 pdu_length - HEADER_SIZE(server) + 1 + 4);
798 if (length < 0)
799 return length;
800 server->total_read += length;
801
802 dump_smb(buf, server->total_read);
803
804 /*
805 * We know that we received enough to get to the MID as we
806 * checked the pdu_length earlier. Now check to see
807 * if the rest of the header is OK. We borrow the length
808 * var for the rest of the loop to avoid a new stack var.
809 *
810 * 48 bytes is enough to display the header and a little bit
811 * into the payload for debugging purposes.
812 */
813 length = server->ops->check_message(buf, server->total_read);
814 if (length != 0)
815 cifs_dump_mem("Bad SMB: ", buf,
816 min_t(unsigned int, server->total_read, 48));
817
818 if (server->ops->is_status_pending &&
819 server->ops->is_status_pending(buf, server, length))
820 return -1;
821
822 if (!mid)
823 return length;
824
825 handle_mid(mid, server, buf, length);
826 return 0;
827 }
828
829 static int
830 cifs_demultiplex_thread(void *p)
831 {
832 int length;
833 struct TCP_Server_Info *server = p;
834 unsigned int pdu_length;
835 char *buf = NULL;
836 struct task_struct *task_to_wake = NULL;
837 struct mid_q_entry *mid_entry;
838
839 current->flags |= PF_MEMALLOC;
840 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
841
842 length = atomic_inc_return(&tcpSesAllocCount);
843 if (length > 1)
844 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
845 GFP_KERNEL);
846
847 set_freezable();
848 while (server->tcpStatus != CifsExiting) {
849 if (try_to_freeze())
850 continue;
851
852 if (!allocate_buffers(server))
853 continue;
854
855 server->large_buf = false;
856 buf = server->smallbuf;
857 pdu_length = 4; /* enough to get RFC1001 header */
858
859 length = cifs_read_from_socket(server, buf, pdu_length);
860 if (length < 0)
861 continue;
862 server->total_read = length;
863
864 /*
865 * The right amount was read from socket - 4 bytes,
866 * so we can now interpret the length field.
867 */
868 pdu_length = get_rfc1002_length(buf);
869
870 cFYI(1, "RFC1002 header 0x%x", pdu_length);
871 if (!is_smb_response(server, buf[0]))
872 continue;
873
874 /* make sure we have enough to get to the MID */
875 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
876 cERROR(1, "SMB response too short (%u bytes)",
877 pdu_length);
878 cifs_reconnect(server);
879 wake_up(&server->response_q);
880 continue;
881 }
882
883 /* read down to the MID */
884 length = cifs_read_from_socket(server, buf + 4,
885 HEADER_SIZE(server) - 1 - 4);
886 if (length < 0)
887 continue;
888 server->total_read += length;
889
890 mid_entry = server->ops->find_mid(server, buf);
891
892 if (!mid_entry || !mid_entry->receive)
893 length = standard_receive3(server, mid_entry);
894 else
895 length = mid_entry->receive(server, mid_entry);
896
897 if (length < 0)
898 continue;
899
900 if (server->large_buf)
901 buf = server->bigbuf;
902
903 server->lstrp = jiffies;
904 if (mid_entry != NULL) {
905 if (!mid_entry->multiRsp || mid_entry->multiEnd)
906 mid_entry->callback(mid_entry);
907 } else if (!server->ops->is_oplock_break ||
908 !server->ops->is_oplock_break(buf, server)) {
909 cERROR(1, "No task to wake, unknown frame received! "
910 "NumMids %d", atomic_read(&midCount));
911 cifs_dump_mem("Received Data is: ", buf,
912 HEADER_SIZE(server));
913 #ifdef CONFIG_CIFS_DEBUG2
914 if (server->ops->dump_detail)
915 server->ops->dump_detail(buf);
916 cifs_dump_mids(server);
917 #endif /* CIFS_DEBUG2 */
918
919 }
920 } /* end while !EXITING */
921
922 /* buffer usually freed in free_mid - need to free it here on exit */
923 cifs_buf_release(server->bigbuf);
924 if (server->smallbuf) /* no sense logging a debug message if NULL */
925 cifs_small_buf_release(server->smallbuf);
926
927 task_to_wake = xchg(&server->tsk, NULL);
928 clean_demultiplex_info(server);
929
930 /* if server->tsk was NULL then wait for a signal before exiting */
931 if (!task_to_wake) {
932 set_current_state(TASK_INTERRUPTIBLE);
933 while (!signal_pending(current)) {
934 schedule();
935 set_current_state(TASK_INTERRUPTIBLE);
936 }
937 set_current_state(TASK_RUNNING);
938 }
939
940 module_put_and_exit(0);
941 }
942
943 /* extract the host portion of the UNC string */
944 static char *
945 extract_hostname(const char *unc)
946 {
947 const char *src;
948 char *dst, *delim;
949 unsigned int len;
950
951 /* skip double chars at beginning of string */
952 /* BB: check validity of these bytes? */
953 src = unc + 2;
954
955 /* delimiter between hostname and sharename is always '\\' now */
956 delim = strchr(src, '\\');
957 if (!delim)
958 return ERR_PTR(-EINVAL);
959
960 len = delim - src;
961 dst = kmalloc((len + 1), GFP_KERNEL);
962 if (dst == NULL)
963 return ERR_PTR(-ENOMEM);
964
965 memcpy(dst, src, len);
966 dst[len] = '\0';
967
968 return dst;
969 }
970
971 static int get_option_ul(substring_t args[], unsigned long *option)
972 {
973 int rc;
974 char *string;
975
976 string = match_strdup(args);
977 if (string == NULL)
978 return -ENOMEM;
979 rc = kstrtoul(string, 0, option);
980 kfree(string);
981
982 return rc;
983 }
984
985
986 static int cifs_parse_security_flavors(char *value,
987 struct smb_vol *vol)
988 {
989
990 substring_t args[MAX_OPT_ARGS];
991
992 switch (match_token(value, cifs_secflavor_tokens, args)) {
993 case Opt_sec_krb5:
994 vol->secFlg |= CIFSSEC_MAY_KRB5;
995 break;
996 case Opt_sec_krb5i:
997 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
998 break;
999 case Opt_sec_krb5p:
1000 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1001 cERROR(1, "Krb5 cifs privacy not supported");
1002 break;
1003 case Opt_sec_ntlmssp:
1004 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1005 break;
1006 case Opt_sec_ntlmsspi:
1007 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1008 break;
1009 case Opt_ntlm:
1010 /* ntlm is default so can be turned off too */
1011 vol->secFlg |= CIFSSEC_MAY_NTLM;
1012 break;
1013 case Opt_sec_ntlmi:
1014 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1015 break;
1016 case Opt_sec_ntlmv2:
1017 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1018 break;
1019 case Opt_sec_ntlmv2i:
1020 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1021 break;
1022 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1023 case Opt_sec_lanman:
1024 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1025 break;
1026 #endif
1027 case Opt_sec_none:
1028 vol->nullauth = 1;
1029 break;
1030 default:
1031 cERROR(1, "bad security option: %s", value);
1032 return 1;
1033 }
1034
1035 return 0;
1036 }
1037
1038 static int
1039 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1040 {
1041 substring_t args[MAX_OPT_ARGS];
1042
1043 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1044 case Opt_cache_loose:
1045 vol->direct_io = false;
1046 vol->strict_io = false;
1047 break;
1048 case Opt_cache_strict:
1049 vol->direct_io = false;
1050 vol->strict_io = true;
1051 break;
1052 case Opt_cache_none:
1053 vol->direct_io = true;
1054 vol->strict_io = false;
1055 break;
1056 default:
1057 cERROR(1, "bad cache= option: %s", value);
1058 return 1;
1059 }
1060 return 0;
1061 }
1062
1063 static int
1064 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1065 {
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 switch (match_token(value, cifs_smb_version_tokens, args)) {
1069 case Smb_1:
1070 vol->ops = &smb1_operations;
1071 vol->vals = &smb1_values;
1072 break;
1073 #ifdef CONFIG_CIFS_SMB2
1074 case Smb_21:
1075 vol->ops = &smb21_operations;
1076 vol->vals = &smb21_values;
1077 break;
1078 case Smb_30:
1079 vol->ops = &smb21_operations; /* currently identical with 2.1 */
1080 vol->vals = &smb30_values;
1081 break;
1082 #endif
1083 default:
1084 cERROR(1, "Unknown vers= option specified: %s", value);
1085 return 1;
1086 }
1087 return 0;
1088 }
1089
1090 static int
1091 cifs_parse_mount_options(const char *mountdata, const char *devname,
1092 struct smb_vol *vol)
1093 {
1094 char *data, *end;
1095 char *mountdata_copy = NULL, *options;
1096 unsigned int temp_len, i, j;
1097 char separator[2];
1098 short int override_uid = -1;
1099 short int override_gid = -1;
1100 bool uid_specified = false;
1101 bool gid_specified = false;
1102 bool sloppy = false;
1103 char *invalid = NULL;
1104 char *nodename = utsname()->nodename;
1105 char *string = NULL;
1106 char *tmp_end, *value;
1107 char delim;
1108
1109 separator[0] = ',';
1110 separator[1] = 0;
1111 delim = separator[0];
1112
1113 /*
1114 * does not have to be perfect mapping since field is
1115 * informational, only used for servers that do not support
1116 * port 445 and it can be overridden at mount time
1117 */
1118 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1119 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1120 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1121
1122 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1123 /* null target name indicates to use *SMBSERVR default called name
1124 if we end up sending RFC1001 session initialize */
1125 vol->target_rfc1001_name[0] = 0;
1126 vol->cred_uid = current_uid();
1127 vol->linux_uid = current_uid();
1128 vol->linux_gid = current_gid();
1129
1130 /* default to only allowing write access to owner of the mount */
1131 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1132
1133 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1134 /* default is always to request posix paths. */
1135 vol->posix_paths = 1;
1136 /* default to using server inode numbers where available */
1137 vol->server_ino = 1;
1138
1139 /* default is to use strict cifs caching semantics */
1140 vol->strict_io = true;
1141
1142 vol->actimeo = CIFS_DEF_ACTIMEO;
1143
1144 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1145 vol->ops = &smb1_operations;
1146 vol->vals = &smb1_values;
1147
1148 if (!mountdata)
1149 goto cifs_parse_mount_err;
1150
1151 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1152 if (!mountdata_copy)
1153 goto cifs_parse_mount_err;
1154
1155 options = mountdata_copy;
1156 end = options + strlen(options);
1157
1158 if (strncmp(options, "sep=", 4) == 0) {
1159 if (options[4] != 0) {
1160 separator[0] = options[4];
1161 options += 5;
1162 } else {
1163 cFYI(1, "Null separator not allowed");
1164 }
1165 }
1166 vol->backupuid_specified = false; /* no backup intent for a user */
1167 vol->backupgid_specified = false; /* no backup intent for a group */
1168
1169 while ((data = strsep(&options, separator)) != NULL) {
1170 substring_t args[MAX_OPT_ARGS];
1171 unsigned long option;
1172 int token;
1173
1174 if (!*data)
1175 continue;
1176
1177 token = match_token(data, cifs_mount_option_tokens, args);
1178
1179 switch (token) {
1180
1181 /* Ingnore the following */
1182 case Opt_ignore:
1183 break;
1184
1185 /* Boolean values */
1186 case Opt_user_xattr:
1187 vol->no_xattr = 0;
1188 break;
1189 case Opt_nouser_xattr:
1190 vol->no_xattr = 1;
1191 break;
1192 case Opt_forceuid:
1193 override_uid = 1;
1194 break;
1195 case Opt_noforceuid:
1196 override_uid = 0;
1197 break;
1198 case Opt_noblocksend:
1199 vol->noblocksnd = 1;
1200 break;
1201 case Opt_noautotune:
1202 vol->noautotune = 1;
1203 break;
1204 case Opt_hard:
1205 vol->retry = 1;
1206 break;
1207 case Opt_soft:
1208 vol->retry = 0;
1209 break;
1210 case Opt_perm:
1211 vol->noperm = 0;
1212 break;
1213 case Opt_noperm:
1214 vol->noperm = 1;
1215 break;
1216 case Opt_mapchars:
1217 vol->remap = 1;
1218 break;
1219 case Opt_nomapchars:
1220 vol->remap = 0;
1221 break;
1222 case Opt_sfu:
1223 vol->sfu_emul = 1;
1224 break;
1225 case Opt_nosfu:
1226 vol->sfu_emul = 0;
1227 break;
1228 case Opt_nodfs:
1229 vol->nodfs = 1;
1230 break;
1231 case Opt_posixpaths:
1232 vol->posix_paths = 1;
1233 break;
1234 case Opt_noposixpaths:
1235 vol->posix_paths = 0;
1236 break;
1237 case Opt_nounix:
1238 vol->no_linux_ext = 1;
1239 break;
1240 case Opt_nocase:
1241 vol->nocase = 1;
1242 break;
1243 case Opt_brl:
1244 vol->nobrl = 0;
1245 break;
1246 case Opt_nobrl:
1247 vol->nobrl = 1;
1248 /*
1249 * turn off mandatory locking in mode
1250 * if remote locking is turned off since the
1251 * local vfs will do advisory
1252 */
1253 if (vol->file_mode ==
1254 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1255 vol->file_mode = S_IALLUGO;
1256 break;
1257 case Opt_forcemandatorylock:
1258 vol->mand_lock = 1;
1259 break;
1260 case Opt_setuids:
1261 vol->setuids = 1;
1262 break;
1263 case Opt_nosetuids:
1264 vol->setuids = 0;
1265 break;
1266 case Opt_dynperm:
1267 vol->dynperm = true;
1268 break;
1269 case Opt_nodynperm:
1270 vol->dynperm = false;
1271 break;
1272 case Opt_nohard:
1273 vol->retry = 0;
1274 break;
1275 case Opt_nosoft:
1276 vol->retry = 1;
1277 break;
1278 case Opt_nointr:
1279 vol->intr = 0;
1280 break;
1281 case Opt_intr:
1282 vol->intr = 1;
1283 break;
1284 case Opt_nostrictsync:
1285 vol->nostrictsync = 1;
1286 break;
1287 case Opt_strictsync:
1288 vol->nostrictsync = 0;
1289 break;
1290 case Opt_serverino:
1291 vol->server_ino = 1;
1292 break;
1293 case Opt_noserverino:
1294 vol->server_ino = 0;
1295 break;
1296 case Opt_rwpidforward:
1297 vol->rwpidforward = 1;
1298 break;
1299 case Opt_cifsacl:
1300 vol->cifs_acl = 1;
1301 break;
1302 case Opt_nocifsacl:
1303 vol->cifs_acl = 0;
1304 break;
1305 case Opt_acl:
1306 vol->no_psx_acl = 0;
1307 break;
1308 case Opt_noacl:
1309 vol->no_psx_acl = 1;
1310 break;
1311 case Opt_locallease:
1312 vol->local_lease = 1;
1313 break;
1314 case Opt_sign:
1315 vol->secFlg |= CIFSSEC_MUST_SIGN;
1316 break;
1317 case Opt_seal:
1318 /* we do not do the following in secFlags because seal
1319 * is a per tree connection (mount) not a per socket
1320 * or per-smb connection option in the protocol
1321 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1322 */
1323 vol->seal = 1;
1324 break;
1325 case Opt_noac:
1326 printk(KERN_WARNING "CIFS: Mount option noac not "
1327 "supported. Instead set "
1328 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1329 break;
1330 case Opt_fsc:
1331 #ifndef CONFIG_CIFS_FSCACHE
1332 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1333 "kernel config option set");
1334 goto cifs_parse_mount_err;
1335 #endif
1336 vol->fsc = true;
1337 break;
1338 case Opt_mfsymlinks:
1339 vol->mfsymlinks = true;
1340 break;
1341 case Opt_multiuser:
1342 vol->multiuser = true;
1343 break;
1344 case Opt_sloppy:
1345 sloppy = true;
1346 break;
1347
1348 /* Numeric Values */
1349 case Opt_backupuid:
1350 if (get_option_ul(args, &option)) {
1351 cERROR(1, "%s: Invalid backupuid value",
1352 __func__);
1353 goto cifs_parse_mount_err;
1354 }
1355 vol->backupuid = option;
1356 vol->backupuid_specified = true;
1357 break;
1358 case Opt_backupgid:
1359 if (get_option_ul(args, &option)) {
1360 cERROR(1, "%s: Invalid backupgid value",
1361 __func__);
1362 goto cifs_parse_mount_err;
1363 }
1364 vol->backupgid = option;
1365 vol->backupgid_specified = true;
1366 break;
1367 case Opt_uid:
1368 if (get_option_ul(args, &option)) {
1369 cERROR(1, "%s: Invalid uid value",
1370 __func__);
1371 goto cifs_parse_mount_err;
1372 }
1373 vol->linux_uid = option;
1374 uid_specified = true;
1375 break;
1376 case Opt_cruid:
1377 if (get_option_ul(args, &option)) {
1378 cERROR(1, "%s: Invalid cruid value",
1379 __func__);
1380 goto cifs_parse_mount_err;
1381 }
1382 vol->cred_uid = option;
1383 break;
1384 case Opt_gid:
1385 if (get_option_ul(args, &option)) {
1386 cERROR(1, "%s: Invalid gid value",
1387 __func__);
1388 goto cifs_parse_mount_err;
1389 }
1390 vol->linux_gid = option;
1391 gid_specified = true;
1392 break;
1393 case Opt_file_mode:
1394 if (get_option_ul(args, &option)) {
1395 cERROR(1, "%s: Invalid file_mode value",
1396 __func__);
1397 goto cifs_parse_mount_err;
1398 }
1399 vol->file_mode = option;
1400 break;
1401 case Opt_dirmode:
1402 if (get_option_ul(args, &option)) {
1403 cERROR(1, "%s: Invalid dir_mode value",
1404 __func__);
1405 goto cifs_parse_mount_err;
1406 }
1407 vol->dir_mode = option;
1408 break;
1409 case Opt_port:
1410 if (get_option_ul(args, &option)) {
1411 cERROR(1, "%s: Invalid port value",
1412 __func__);
1413 goto cifs_parse_mount_err;
1414 }
1415 vol->port = option;
1416 break;
1417 case Opt_rsize:
1418 if (get_option_ul(args, &option)) {
1419 cERROR(1, "%s: Invalid rsize value",
1420 __func__);
1421 goto cifs_parse_mount_err;
1422 }
1423 vol->rsize = option;
1424 break;
1425 case Opt_wsize:
1426 if (get_option_ul(args, &option)) {
1427 cERROR(1, "%s: Invalid wsize value",
1428 __func__);
1429 goto cifs_parse_mount_err;
1430 }
1431 vol->wsize = option;
1432 break;
1433 case Opt_actimeo:
1434 if (get_option_ul(args, &option)) {
1435 cERROR(1, "%s: Invalid actimeo value",
1436 __func__);
1437 goto cifs_parse_mount_err;
1438 }
1439 vol->actimeo = HZ * option;
1440 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1441 cERROR(1, "CIFS: attribute cache"
1442 "timeout too large");
1443 goto cifs_parse_mount_err;
1444 }
1445 break;
1446
1447 /* String Arguments */
1448
1449 case Opt_blank_user:
1450 /* null user, ie. anonymous authentication */
1451 vol->nullauth = 1;
1452 vol->username = NULL;
1453 break;
1454 case Opt_user:
1455 string = match_strdup(args);
1456 if (string == NULL)
1457 goto out_nomem;
1458
1459 if (strnlen(string, MAX_USERNAME_SIZE) >
1460 MAX_USERNAME_SIZE) {
1461 printk(KERN_WARNING "CIFS: username too long\n");
1462 goto cifs_parse_mount_err;
1463 }
1464 vol->username = kstrdup(string, GFP_KERNEL);
1465 if (!vol->username) {
1466 printk(KERN_WARNING "CIFS: no memory "
1467 "for username\n");
1468 goto cifs_parse_mount_err;
1469 }
1470 break;
1471 case Opt_blank_pass:
1472 vol->password = NULL;
1473 break;
1474 case Opt_pass:
1475 /* passwords have to be handled differently
1476 * to allow the character used for deliminator
1477 * to be passed within them
1478 */
1479
1480 /* Obtain the value string */
1481 value = strchr(data, '=');
1482 value++;
1483
1484 /* Set tmp_end to end of the string */
1485 tmp_end = (char *) value + strlen(value);
1486
1487 /* Check if following character is the deliminator
1488 * If yes, we have encountered a double deliminator
1489 * reset the NULL character to the deliminator
1490 */
1491 if (tmp_end < end && tmp_end[1] == delim) {
1492 tmp_end[0] = delim;
1493
1494 /* Keep iterating until we get to a single
1495 * deliminator OR the end
1496 */
1497 while ((tmp_end = strchr(tmp_end, delim))
1498 != NULL && (tmp_end[1] == delim)) {
1499 tmp_end = (char *) &tmp_end[2];
1500 }
1501
1502 /* Reset var options to point to next element */
1503 if (tmp_end) {
1504 tmp_end[0] = '\0';
1505 options = (char *) &tmp_end[1];
1506 } else
1507 /* Reached the end of the mount option
1508 * string */
1509 options = end;
1510 }
1511
1512 /* Now build new password string */
1513 temp_len = strlen(value);
1514 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1515 if (vol->password == NULL) {
1516 printk(KERN_WARNING "CIFS: no memory "
1517 "for password\n");
1518 goto cifs_parse_mount_err;
1519 }
1520
1521 for (i = 0, j = 0; i < temp_len; i++, j++) {
1522 vol->password[j] = value[i];
1523 if ((value[i] == delim) &&
1524 value[i+1] == delim)
1525 /* skip the second deliminator */
1526 i++;
1527 }
1528 vol->password[j] = '\0';
1529 break;
1530 case Opt_blank_ip:
1531 vol->UNCip = NULL;
1532 break;
1533 case Opt_ip:
1534 string = match_strdup(args);
1535 if (string == NULL)
1536 goto out_nomem;
1537
1538 if (strnlen(string, INET6_ADDRSTRLEN) >
1539 INET6_ADDRSTRLEN) {
1540 printk(KERN_WARNING "CIFS: ip address "
1541 "too long\n");
1542 goto cifs_parse_mount_err;
1543 }
1544 vol->UNCip = kstrdup(string, GFP_KERNEL);
1545 if (!vol->UNCip) {
1546 printk(KERN_WARNING "CIFS: no memory "
1547 "for UNC IP\n");
1548 goto cifs_parse_mount_err;
1549 }
1550 break;
1551 case Opt_unc:
1552 string = match_strdup(args);
1553 if (string == NULL)
1554 goto out_nomem;
1555
1556 temp_len = strnlen(string, 300);
1557 if (temp_len == 300) {
1558 printk(KERN_WARNING "CIFS: UNC name too long\n");
1559 goto cifs_parse_mount_err;
1560 }
1561
1562 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1563 if (vol->UNC == NULL) {
1564 printk(KERN_WARNING "CIFS: no memory for UNC\n");
1565 goto cifs_parse_mount_err;
1566 }
1567 strcpy(vol->UNC, string);
1568
1569 if (strncmp(string, "//", 2) == 0) {
1570 vol->UNC[0] = '\\';
1571 vol->UNC[1] = '\\';
1572 } else if (strncmp(string, "\\\\", 2) != 0) {
1573 printk(KERN_WARNING "CIFS: UNC Path does not "
1574 "begin with // or \\\\\n");
1575 goto cifs_parse_mount_err;
1576 }
1577
1578 break;
1579 case Opt_domain:
1580 string = match_strdup(args);
1581 if (string == NULL)
1582 goto out_nomem;
1583
1584 if (strnlen(string, 256) == 256) {
1585 printk(KERN_WARNING "CIFS: domain name too"
1586 " long\n");
1587 goto cifs_parse_mount_err;
1588 }
1589
1590 vol->domainname = kstrdup(string, GFP_KERNEL);
1591 if (!vol->domainname) {
1592 printk(KERN_WARNING "CIFS: no memory "
1593 "for domainname\n");
1594 goto cifs_parse_mount_err;
1595 }
1596 cFYI(1, "Domain name set");
1597 break;
1598 case Opt_srcaddr:
1599 string = match_strdup(args);
1600 if (string == NULL)
1601 goto out_nomem;
1602
1603 if (!cifs_convert_address(
1604 (struct sockaddr *)&vol->srcaddr,
1605 string, strlen(string))) {
1606 printk(KERN_WARNING "CIFS: Could not parse"
1607 " srcaddr: %s\n", string);
1608 goto cifs_parse_mount_err;
1609 }
1610 break;
1611 case Opt_prefixpath:
1612 string = match_strdup(args);
1613 if (string == NULL)
1614 goto out_nomem;
1615
1616 temp_len = strnlen(string, 1024);
1617 if (string[0] != '/')
1618 temp_len++; /* missing leading slash */
1619 if (temp_len > 1024) {
1620 printk(KERN_WARNING "CIFS: prefix too long\n");
1621 goto cifs_parse_mount_err;
1622 }
1623
1624 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1625 if (vol->prepath == NULL) {
1626 printk(KERN_WARNING "CIFS: no memory "
1627 "for path prefix\n");
1628 goto cifs_parse_mount_err;
1629 }
1630
1631 if (string[0] != '/') {
1632 vol->prepath[0] = '/';
1633 strcpy(vol->prepath+1, string);
1634 } else
1635 strcpy(vol->prepath, string);
1636
1637 break;
1638 case Opt_iocharset:
1639 string = match_strdup(args);
1640 if (string == NULL)
1641 goto out_nomem;
1642
1643 if (strnlen(string, 1024) >= 65) {
1644 printk(KERN_WARNING "CIFS: iocharset name "
1645 "too long.\n");
1646 goto cifs_parse_mount_err;
1647 }
1648
1649 if (strnicmp(string, "default", 7) != 0) {
1650 vol->iocharset = kstrdup(string,
1651 GFP_KERNEL);
1652 if (!vol->iocharset) {
1653 printk(KERN_WARNING "CIFS: no memory"
1654 "for charset\n");
1655 goto cifs_parse_mount_err;
1656 }
1657 }
1658 /* if iocharset not set then load_nls_default
1659 * is used by caller
1660 */
1661 cFYI(1, "iocharset set to %s", string);
1662 break;
1663 case Opt_sockopt:
1664 string = match_strdup(args);
1665 if (string == NULL)
1666 goto out_nomem;
1667
1668 if (strnicmp(string, "TCP_NODELAY", 11) == 0) {
1669 printk(KERN_WARNING "CIFS: the "
1670 "sockopt=TCP_NODELAY option has been "
1671 "deprecated and will be removed "
1672 "in 3.9\n");
1673 vol->sockopt_tcp_nodelay = 1;
1674 }
1675 break;
1676 case Opt_netbiosname:
1677 string = match_strdup(args);
1678 if (string == NULL)
1679 goto out_nomem;
1680
1681 memset(vol->source_rfc1001_name, 0x20,
1682 RFC1001_NAME_LEN);
1683 /*
1684 * FIXME: are there cases in which a comma can
1685 * be valid in workstation netbios name (and
1686 * need special handling)?
1687 */
1688 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1689 /* don't ucase netbiosname for user */
1690 if (string[i] == 0)
1691 break;
1692 vol->source_rfc1001_name[i] = string[i];
1693 }
1694 /* The string has 16th byte zero still from
1695 * set at top of the function
1696 */
1697 if (i == RFC1001_NAME_LEN && string[i] != 0)
1698 printk(KERN_WARNING "CIFS: netbiosname"
1699 " longer than 15 truncated.\n");
1700
1701 break;
1702 case Opt_servern:
1703 /* servernetbiosname specified override *SMBSERVER */
1704 string = match_strdup(args);
1705 if (string == NULL)
1706 goto out_nomem;
1707
1708 /* last byte, type, is 0x20 for servr type */
1709 memset(vol->target_rfc1001_name, 0x20,
1710 RFC1001_NAME_LEN_WITH_NULL);
1711
1712 /* BB are there cases in which a comma can be
1713 valid in this workstation netbios name
1714 (and need special handling)? */
1715
1716 /* user or mount helper must uppercase the
1717 netbios name */
1718 for (i = 0; i < 15; i++) {
1719 if (string[i] == 0)
1720 break;
1721 vol->target_rfc1001_name[i] = string[i];
1722 }
1723 /* The string has 16th byte zero still from
1724 set at top of the function */
1725 if (i == RFC1001_NAME_LEN && string[i] != 0)
1726 printk(KERN_WARNING "CIFS: server net"
1727 "biosname longer than 15 truncated.\n");
1728 break;
1729 case Opt_ver:
1730 string = match_strdup(args);
1731 if (string == NULL)
1732 goto out_nomem;
1733
1734 if (strnicmp(string, "1", 1) == 0) {
1735 /* This is the default */
1736 break;
1737 }
1738 /* For all other value, error */
1739 printk(KERN_WARNING "CIFS: Invalid version"
1740 " specified\n");
1741 goto cifs_parse_mount_err;
1742 case Opt_vers:
1743 string = match_strdup(args);
1744 if (string == NULL)
1745 goto out_nomem;
1746
1747 if (cifs_parse_smb_version(string, vol) != 0)
1748 goto cifs_parse_mount_err;
1749 break;
1750 case Opt_sec:
1751 string = match_strdup(args);
1752 if (string == NULL)
1753 goto out_nomem;
1754
1755 if (cifs_parse_security_flavors(string, vol) != 0)
1756 goto cifs_parse_mount_err;
1757 break;
1758 case Opt_cache:
1759 string = match_strdup(args);
1760 if (string == NULL)
1761 goto out_nomem;
1762
1763 if (cifs_parse_cache_flavor(string, vol) != 0)
1764 goto cifs_parse_mount_err;
1765 break;
1766 default:
1767 /*
1768 * An option we don't recognize. Save it off for later
1769 * if we haven't already found one
1770 */
1771 if (!invalid)
1772 invalid = data;
1773 break;
1774 }
1775 /* Free up any allocated string */
1776 kfree(string);
1777 string = NULL;
1778 }
1779
1780 if (!sloppy && invalid) {
1781 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1782 goto cifs_parse_mount_err;
1783 }
1784
1785 #ifndef CONFIG_KEYS
1786 /* Muliuser mounts require CONFIG_KEYS support */
1787 if (vol->multiuser) {
1788 cERROR(1, "Multiuser mounts require kernels with "
1789 "CONFIG_KEYS enabled.");
1790 goto cifs_parse_mount_err;
1791 }
1792 #endif
1793
1794 if (vol->UNCip == NULL)
1795 vol->UNCip = &vol->UNC[2];
1796
1797 if (uid_specified)
1798 vol->override_uid = override_uid;
1799 else if (override_uid == 1)
1800 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1801 "specified with no uid= option.\n");
1802
1803 if (gid_specified)
1804 vol->override_gid = override_gid;
1805 else if (override_gid == 1)
1806 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1807 "specified with no gid= option.\n");
1808
1809 kfree(mountdata_copy);
1810 return 0;
1811
1812 out_nomem:
1813 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1814 cifs_parse_mount_err:
1815 kfree(string);
1816 kfree(mountdata_copy);
1817 return 1;
1818 }
1819
1820 /** Returns true if srcaddr isn't specified and rhs isn't
1821 * specified, or if srcaddr is specified and
1822 * matches the IP address of the rhs argument.
1823 */
1824 static bool
1825 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1826 {
1827 switch (srcaddr->sa_family) {
1828 case AF_UNSPEC:
1829 return (rhs->sa_family == AF_UNSPEC);
1830 case AF_INET: {
1831 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1832 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1833 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1834 }
1835 case AF_INET6: {
1836 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1837 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1838 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1839 }
1840 default:
1841 WARN_ON(1);
1842 return false; /* don't expect to be here */
1843 }
1844 }
1845
1846 /*
1847 * If no port is specified in addr structure, we try to match with 445 port
1848 * and if it fails - with 139 ports. It should be called only if address
1849 * families of server and addr are equal.
1850 */
1851 static bool
1852 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1853 {
1854 __be16 port, *sport;
1855
1856 switch (addr->sa_family) {
1857 case AF_INET:
1858 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1859 port = ((struct sockaddr_in *) addr)->sin_port;
1860 break;
1861 case AF_INET6:
1862 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1863 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1864 break;
1865 default:
1866 WARN_ON(1);
1867 return false;
1868 }
1869
1870 if (!port) {
1871 port = htons(CIFS_PORT);
1872 if (port == *sport)
1873 return true;
1874
1875 port = htons(RFC1001_PORT);
1876 }
1877
1878 return port == *sport;
1879 }
1880
1881 static bool
1882 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1883 struct sockaddr *srcaddr)
1884 {
1885 switch (addr->sa_family) {
1886 case AF_INET: {
1887 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1888 struct sockaddr_in *srv_addr4 =
1889 (struct sockaddr_in *)&server->dstaddr;
1890
1891 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1892 return false;
1893 break;
1894 }
1895 case AF_INET6: {
1896 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1897 struct sockaddr_in6 *srv_addr6 =
1898 (struct sockaddr_in6 *)&server->dstaddr;
1899
1900 if (!ipv6_addr_equal(&addr6->sin6_addr,
1901 &srv_addr6->sin6_addr))
1902 return false;
1903 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1904 return false;
1905 break;
1906 }
1907 default:
1908 WARN_ON(1);
1909 return false; /* don't expect to be here */
1910 }
1911
1912 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1913 return false;
1914
1915 return true;
1916 }
1917
1918 static bool
1919 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1920 {
1921 unsigned int secFlags;
1922
1923 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1924 secFlags = vol->secFlg;
1925 else
1926 secFlags = global_secflags | vol->secFlg;
1927
1928 switch (server->secType) {
1929 case LANMAN:
1930 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1931 return false;
1932 break;
1933 case NTLMv2:
1934 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1935 return false;
1936 break;
1937 case NTLM:
1938 if (!(secFlags & CIFSSEC_MAY_NTLM))
1939 return false;
1940 break;
1941 case Kerberos:
1942 if (!(secFlags & CIFSSEC_MAY_KRB5))
1943 return false;
1944 break;
1945 case RawNTLMSSP:
1946 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1947 return false;
1948 break;
1949 default:
1950 /* shouldn't happen */
1951 return false;
1952 }
1953
1954 /* now check if signing mode is acceptable */
1955 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1956 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1957 return false;
1958 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1959 (server->sec_mode &
1960 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1961 return false;
1962
1963 return true;
1964 }
1965
1966 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1967 struct smb_vol *vol)
1968 {
1969 if ((server->vals != vol->vals) || (server->ops != vol->ops))
1970 return 0;
1971
1972 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1973 return 0;
1974
1975 if (!match_address(server, addr,
1976 (struct sockaddr *)&vol->srcaddr))
1977 return 0;
1978
1979 if (!match_port(server, addr))
1980 return 0;
1981
1982 if (!match_security(server, vol))
1983 return 0;
1984
1985 return 1;
1986 }
1987
1988 static struct TCP_Server_Info *
1989 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1990 {
1991 struct TCP_Server_Info *server;
1992
1993 spin_lock(&cifs_tcp_ses_lock);
1994 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1995 if (!match_server(server, addr, vol))
1996 continue;
1997
1998 ++server->srv_count;
1999 spin_unlock(&cifs_tcp_ses_lock);
2000 cFYI(1, "Existing tcp session with server found");
2001 return server;
2002 }
2003 spin_unlock(&cifs_tcp_ses_lock);
2004 return NULL;
2005 }
2006
2007 static void
2008 cifs_put_tcp_session(struct TCP_Server_Info *server)
2009 {
2010 struct task_struct *task;
2011
2012 spin_lock(&cifs_tcp_ses_lock);
2013 if (--server->srv_count > 0) {
2014 spin_unlock(&cifs_tcp_ses_lock);
2015 return;
2016 }
2017
2018 put_net(cifs_net_ns(server));
2019
2020 list_del_init(&server->tcp_ses_list);
2021 spin_unlock(&cifs_tcp_ses_lock);
2022
2023 cancel_delayed_work_sync(&server->echo);
2024
2025 spin_lock(&GlobalMid_Lock);
2026 server->tcpStatus = CifsExiting;
2027 spin_unlock(&GlobalMid_Lock);
2028
2029 cifs_crypto_shash_release(server);
2030 cifs_fscache_release_client_cookie(server);
2031
2032 kfree(server->session_key.response);
2033 server->session_key.response = NULL;
2034 server->session_key.len = 0;
2035
2036 task = xchg(&server->tsk, NULL);
2037 if (task)
2038 force_sig(SIGKILL, task);
2039 }
2040
2041 static struct TCP_Server_Info *
2042 cifs_get_tcp_session(struct smb_vol *volume_info)
2043 {
2044 struct TCP_Server_Info *tcp_ses = NULL;
2045 struct sockaddr_storage addr;
2046 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
2047 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
2048 int rc;
2049
2050 memset(&addr, 0, sizeof(struct sockaddr_storage));
2051
2052 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
2053
2054 if (volume_info->UNCip && volume_info->UNC) {
2055 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2056 volume_info->UNCip,
2057 strlen(volume_info->UNCip),
2058 volume_info->port);
2059 if (!rc) {
2060 /* we failed translating address */
2061 rc = -EINVAL;
2062 goto out_err;
2063 }
2064 } else if (volume_info->UNCip) {
2065 /* BB using ip addr as tcp_ses name to connect to the
2066 DFS root below */
2067 cERROR(1, "Connecting to DFS root not implemented yet");
2068 rc = -EINVAL;
2069 goto out_err;
2070 } else /* which tcp_sess DFS root would we conect to */ {
2071 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
2072 "unc=//192.168.1.100/public) specified");
2073 rc = -EINVAL;
2074 goto out_err;
2075 }
2076
2077 /* see if we already have a matching tcp_ses */
2078 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
2079 if (tcp_ses)
2080 return tcp_ses;
2081
2082 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2083 if (!tcp_ses) {
2084 rc = -ENOMEM;
2085 goto out_err;
2086 }
2087
2088 rc = cifs_crypto_shash_allocate(tcp_ses);
2089 if (rc) {
2090 cERROR(1, "could not setup hash structures rc %d", rc);
2091 goto out_err;
2092 }
2093
2094 tcp_ses->ops = volume_info->ops;
2095 tcp_ses->vals = volume_info->vals;
2096 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2097 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2098 if (IS_ERR(tcp_ses->hostname)) {
2099 rc = PTR_ERR(tcp_ses->hostname);
2100 goto out_err_crypto_release;
2101 }
2102
2103 tcp_ses->noblocksnd = volume_info->noblocksnd;
2104 tcp_ses->noautotune = volume_info->noautotune;
2105 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2106 tcp_ses->in_flight = 0;
2107 tcp_ses->credits = 1;
2108 init_waitqueue_head(&tcp_ses->response_q);
2109 init_waitqueue_head(&tcp_ses->request_q);
2110 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2111 mutex_init(&tcp_ses->srv_mutex);
2112 memcpy(tcp_ses->workstation_RFC1001_name,
2113 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2114 memcpy(tcp_ses->server_RFC1001_name,
2115 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2116 tcp_ses->session_estab = false;
2117 tcp_ses->sequence_number = 0;
2118 tcp_ses->lstrp = jiffies;
2119 spin_lock_init(&tcp_ses->req_lock);
2120 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2121 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2122 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2123
2124 /*
2125 * at this point we are the only ones with the pointer
2126 * to the struct since the kernel thread not created yet
2127 * no need to spinlock this init of tcpStatus or srv_count
2128 */
2129 tcp_ses->tcpStatus = CifsNew;
2130 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2131 sizeof(tcp_ses->srcaddr));
2132 ++tcp_ses->srv_count;
2133
2134 if (addr.ss_family == AF_INET6) {
2135 cFYI(1, "attempting ipv6 connect");
2136 /* BB should we allow ipv6 on port 139? */
2137 /* other OS never observed in Wild doing 139 with v6 */
2138 memcpy(&tcp_ses->dstaddr, sin_server6,
2139 sizeof(struct sockaddr_in6));
2140 } else
2141 memcpy(&tcp_ses->dstaddr, sin_server,
2142 sizeof(struct sockaddr_in));
2143
2144 rc = ip_connect(tcp_ses);
2145 if (rc < 0) {
2146 cERROR(1, "Error connecting to socket. Aborting operation");
2147 goto out_err_crypto_release;
2148 }
2149
2150 /*
2151 * since we're in a cifs function already, we know that
2152 * this will succeed. No need for try_module_get().
2153 */
2154 __module_get(THIS_MODULE);
2155 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2156 tcp_ses, "cifsd");
2157 if (IS_ERR(tcp_ses->tsk)) {
2158 rc = PTR_ERR(tcp_ses->tsk);
2159 cERROR(1, "error %d create cifsd thread", rc);
2160 module_put(THIS_MODULE);
2161 goto out_err_crypto_release;
2162 }
2163 tcp_ses->tcpStatus = CifsNeedNegotiate;
2164
2165 /* thread spawned, put it on the list */
2166 spin_lock(&cifs_tcp_ses_lock);
2167 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2168 spin_unlock(&cifs_tcp_ses_lock);
2169
2170 cifs_fscache_get_client_cookie(tcp_ses);
2171
2172 /* queue echo request delayed work */
2173 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2174
2175 return tcp_ses;
2176
2177 out_err_crypto_release:
2178 cifs_crypto_shash_release(tcp_ses);
2179
2180 put_net(cifs_net_ns(tcp_ses));
2181
2182 out_err:
2183 if (tcp_ses) {
2184 if (!IS_ERR(tcp_ses->hostname))
2185 kfree(tcp_ses->hostname);
2186 if (tcp_ses->ssocket)
2187 sock_release(tcp_ses->ssocket);
2188 kfree(tcp_ses);
2189 }
2190 return ERR_PTR(rc);
2191 }
2192
2193 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2194 {
2195 switch (ses->server->secType) {
2196 case Kerberos:
2197 if (vol->cred_uid != ses->cred_uid)
2198 return 0;
2199 break;
2200 default:
2201 /* NULL username means anonymous session */
2202 if (ses->user_name == NULL) {
2203 if (!vol->nullauth)
2204 return 0;
2205 break;
2206 }
2207
2208 /* anything else takes username/password */
2209 if (strncmp(ses->user_name,
2210 vol->username ? vol->username : "",
2211 MAX_USERNAME_SIZE))
2212 return 0;
2213 if (strlen(vol->username) != 0 &&
2214 ses->password != NULL &&
2215 strncmp(ses->password,
2216 vol->password ? vol->password : "",
2217 MAX_PASSWORD_SIZE))
2218 return 0;
2219 }
2220 return 1;
2221 }
2222
2223 static struct cifs_ses *
2224 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2225 {
2226 struct cifs_ses *ses;
2227
2228 spin_lock(&cifs_tcp_ses_lock);
2229 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2230 if (!match_session(ses, vol))
2231 continue;
2232 ++ses->ses_count;
2233 spin_unlock(&cifs_tcp_ses_lock);
2234 return ses;
2235 }
2236 spin_unlock(&cifs_tcp_ses_lock);
2237 return NULL;
2238 }
2239
2240 static void
2241 cifs_put_smb_ses(struct cifs_ses *ses)
2242 {
2243 unsigned int xid;
2244 struct TCP_Server_Info *server = ses->server;
2245
2246 cFYI(1, "%s: ses_count=%d", __func__, ses->ses_count);
2247 spin_lock(&cifs_tcp_ses_lock);
2248 if (--ses->ses_count > 0) {
2249 spin_unlock(&cifs_tcp_ses_lock);
2250 return;
2251 }
2252
2253 list_del_init(&ses->smb_ses_list);
2254 spin_unlock(&cifs_tcp_ses_lock);
2255
2256 if (ses->status == CifsGood && server->ops->logoff) {
2257 xid = get_xid();
2258 server->ops->logoff(xid, ses);
2259 _free_xid(xid);
2260 }
2261 sesInfoFree(ses);
2262 cifs_put_tcp_session(server);
2263 }
2264
2265 #ifdef CONFIG_KEYS
2266
2267 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2268 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2269
2270 /* Populate username and pw fields from keyring if possible */
2271 static int
2272 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2273 {
2274 int rc = 0;
2275 char *desc, *delim, *payload;
2276 ssize_t len;
2277 struct key *key;
2278 struct TCP_Server_Info *server = ses->server;
2279 struct sockaddr_in *sa;
2280 struct sockaddr_in6 *sa6;
2281 struct user_key_payload *upayload;
2282
2283 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2284 if (!desc)
2285 return -ENOMEM;
2286
2287 /* try to find an address key first */
2288 switch (server->dstaddr.ss_family) {
2289 case AF_INET:
2290 sa = (struct sockaddr_in *)&server->dstaddr;
2291 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2292 break;
2293 case AF_INET6:
2294 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2295 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2296 break;
2297 default:
2298 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2299 rc = -EINVAL;
2300 goto out_err;
2301 }
2302
2303 cFYI(1, "%s: desc=%s", __func__, desc);
2304 key = request_key(&key_type_logon, desc, "");
2305 if (IS_ERR(key)) {
2306 if (!ses->domainName) {
2307 cFYI(1, "domainName is NULL");
2308 rc = PTR_ERR(key);
2309 goto out_err;
2310 }
2311
2312 /* didn't work, try to find a domain key */
2313 sprintf(desc, "cifs:d:%s", ses->domainName);
2314 cFYI(1, "%s: desc=%s", __func__, desc);
2315 key = request_key(&key_type_logon, desc, "");
2316 if (IS_ERR(key)) {
2317 rc = PTR_ERR(key);
2318 goto out_err;
2319 }
2320 }
2321
2322 down_read(&key->sem);
2323 upayload = key->payload.data;
2324 if (IS_ERR_OR_NULL(upayload)) {
2325 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2326 goto out_key_put;
2327 }
2328
2329 /* find first : in payload */
2330 payload = (char *)upayload->data;
2331 delim = strnchr(payload, upayload->datalen, ':');
2332 cFYI(1, "payload=%s", payload);
2333 if (!delim) {
2334 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2335 upayload->datalen);
2336 rc = -EINVAL;
2337 goto out_key_put;
2338 }
2339
2340 len = delim - payload;
2341 if (len > MAX_USERNAME_SIZE || len <= 0) {
2342 cFYI(1, "Bad value from username search (len=%zd)", len);
2343 rc = -EINVAL;
2344 goto out_key_put;
2345 }
2346
2347 vol->username = kstrndup(payload, len, GFP_KERNEL);
2348 if (!vol->username) {
2349 cFYI(1, "Unable to allocate %zd bytes for username", len);
2350 rc = -ENOMEM;
2351 goto out_key_put;
2352 }
2353 cFYI(1, "%s: username=%s", __func__, vol->username);
2354
2355 len = key->datalen - (len + 1);
2356 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2357 cFYI(1, "Bad len for password search (len=%zd)", len);
2358 rc = -EINVAL;
2359 kfree(vol->username);
2360 vol->username = NULL;
2361 goto out_key_put;
2362 }
2363
2364 ++delim;
2365 vol->password = kstrndup(delim, len, GFP_KERNEL);
2366 if (!vol->password) {
2367 cFYI(1, "Unable to allocate %zd bytes for password", len);
2368 rc = -ENOMEM;
2369 kfree(vol->username);
2370 vol->username = NULL;
2371 goto out_key_put;
2372 }
2373
2374 out_key_put:
2375 up_read(&key->sem);
2376 key_put(key);
2377 out_err:
2378 kfree(desc);
2379 cFYI(1, "%s: returning %d", __func__, rc);
2380 return rc;
2381 }
2382 #else /* ! CONFIG_KEYS */
2383 static inline int
2384 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2385 struct cifs_ses *ses __attribute__((unused)))
2386 {
2387 return -ENOSYS;
2388 }
2389 #endif /* CONFIG_KEYS */
2390
2391 static bool warned_on_ntlm; /* globals init to false automatically */
2392
2393 static struct cifs_ses *
2394 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2395 {
2396 int rc = -ENOMEM;
2397 unsigned int xid;
2398 struct cifs_ses *ses;
2399 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2400 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2401
2402 xid = get_xid();
2403
2404 ses = cifs_find_smb_ses(server, volume_info);
2405 if (ses) {
2406 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2407
2408 mutex_lock(&ses->session_mutex);
2409 rc = cifs_negotiate_protocol(xid, ses);
2410 if (rc) {
2411 mutex_unlock(&ses->session_mutex);
2412 /* problem -- put our ses reference */
2413 cifs_put_smb_ses(ses);
2414 free_xid(xid);
2415 return ERR_PTR(rc);
2416 }
2417 if (ses->need_reconnect) {
2418 cFYI(1, "Session needs reconnect");
2419 rc = cifs_setup_session(xid, ses,
2420 volume_info->local_nls);
2421 if (rc) {
2422 mutex_unlock(&ses->session_mutex);
2423 /* problem -- put our reference */
2424 cifs_put_smb_ses(ses);
2425 free_xid(xid);
2426 return ERR_PTR(rc);
2427 }
2428 }
2429 mutex_unlock(&ses->session_mutex);
2430
2431 /* existing SMB ses has a server reference already */
2432 cifs_put_tcp_session(server);
2433 free_xid(xid);
2434 return ses;
2435 }
2436
2437 cFYI(1, "Existing smb sess not found");
2438 ses = sesInfoAlloc();
2439 if (ses == NULL)
2440 goto get_ses_fail;
2441
2442 /* new SMB session uses our server ref */
2443 ses->server = server;
2444 if (server->dstaddr.ss_family == AF_INET6)
2445 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2446 else
2447 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2448
2449 if (volume_info->username) {
2450 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2451 if (!ses->user_name)
2452 goto get_ses_fail;
2453 }
2454
2455 /* volume_info->password freed at unmount */
2456 if (volume_info->password) {
2457 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2458 if (!ses->password)
2459 goto get_ses_fail;
2460 }
2461 if (volume_info->domainname) {
2462 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2463 if (!ses->domainName)
2464 goto get_ses_fail;
2465 }
2466 ses->cred_uid = volume_info->cred_uid;
2467 ses->linux_uid = volume_info->linux_uid;
2468
2469 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2470 supported for many years, time to update default security mechanism */
2471 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2472 warned_on_ntlm = true;
2473 cERROR(1, "default security mechanism requested. The default "
2474 "security mechanism will be upgraded from ntlm to "
2475 "ntlmv2 in kernel release 3.3");
2476 }
2477 ses->overrideSecFlg = volume_info->secFlg;
2478
2479 mutex_lock(&ses->session_mutex);
2480 rc = cifs_negotiate_protocol(xid, ses);
2481 if (!rc)
2482 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2483 mutex_unlock(&ses->session_mutex);
2484 if (rc)
2485 goto get_ses_fail;
2486
2487 /* success, put it on the list */
2488 spin_lock(&cifs_tcp_ses_lock);
2489 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2490 spin_unlock(&cifs_tcp_ses_lock);
2491
2492 free_xid(xid);
2493 return ses;
2494
2495 get_ses_fail:
2496 sesInfoFree(ses);
2497 free_xid(xid);
2498 return ERR_PTR(rc);
2499 }
2500
2501 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2502 {
2503 if (tcon->tidStatus == CifsExiting)
2504 return 0;
2505 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2506 return 0;
2507 return 1;
2508 }
2509
2510 static struct cifs_tcon *
2511 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2512 {
2513 struct list_head *tmp;
2514 struct cifs_tcon *tcon;
2515
2516 spin_lock(&cifs_tcp_ses_lock);
2517 list_for_each(tmp, &ses->tcon_list) {
2518 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2519 if (!match_tcon(tcon, unc))
2520 continue;
2521 ++tcon->tc_count;
2522 spin_unlock(&cifs_tcp_ses_lock);
2523 return tcon;
2524 }
2525 spin_unlock(&cifs_tcp_ses_lock);
2526 return NULL;
2527 }
2528
2529 static void
2530 cifs_put_tcon(struct cifs_tcon *tcon)
2531 {
2532 unsigned int xid;
2533 struct cifs_ses *ses = tcon->ses;
2534
2535 cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
2536 spin_lock(&cifs_tcp_ses_lock);
2537 if (--tcon->tc_count > 0) {
2538 spin_unlock(&cifs_tcp_ses_lock);
2539 return;
2540 }
2541
2542 list_del_init(&tcon->tcon_list);
2543 spin_unlock(&cifs_tcp_ses_lock);
2544
2545 xid = get_xid();
2546 if (ses->server->ops->tree_disconnect)
2547 ses->server->ops->tree_disconnect(xid, tcon);
2548 _free_xid(xid);
2549
2550 cifs_fscache_release_super_cookie(tcon);
2551 tconInfoFree(tcon);
2552 cifs_put_smb_ses(ses);
2553 }
2554
2555 static struct cifs_tcon *
2556 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2557 {
2558 int rc, xid;
2559 struct cifs_tcon *tcon;
2560
2561 tcon = cifs_find_tcon(ses, volume_info->UNC);
2562 if (tcon) {
2563 cFYI(1, "Found match on UNC path");
2564 /* existing tcon already has a reference */
2565 cifs_put_smb_ses(ses);
2566 if (tcon->seal != volume_info->seal)
2567 cERROR(1, "transport encryption setting "
2568 "conflicts with existing tid");
2569 return tcon;
2570 }
2571
2572 if (!ses->server->ops->tree_connect) {
2573 rc = -ENOSYS;
2574 goto out_fail;
2575 }
2576
2577 tcon = tconInfoAlloc();
2578 if (tcon == NULL) {
2579 rc = -ENOMEM;
2580 goto out_fail;
2581 }
2582
2583 tcon->ses = ses;
2584 if (volume_info->password) {
2585 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2586 if (!tcon->password) {
2587 rc = -ENOMEM;
2588 goto out_fail;
2589 }
2590 }
2591
2592 if (strchr(volume_info->UNC + 3, '\\') == NULL
2593 && strchr(volume_info->UNC + 3, '/') == NULL) {
2594 cERROR(1, "Missing share name");
2595 rc = -ENODEV;
2596 goto out_fail;
2597 }
2598
2599 /*
2600 * BB Do we need to wrap session_mutex around this TCon call and Unix
2601 * SetFS as we do on SessSetup and reconnect?
2602 */
2603 xid = get_xid();
2604 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2605 volume_info->local_nls);
2606 free_xid(xid);
2607 cFYI(1, "Tcon rc = %d", rc);
2608 if (rc)
2609 goto out_fail;
2610
2611 if (volume_info->nodfs) {
2612 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2613 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2614 }
2615 tcon->seal = volume_info->seal;
2616 /*
2617 * We can have only one retry value for a connection to a share so for
2618 * resources mounted more than once to the same server share the last
2619 * value passed in for the retry flag is used.
2620 */
2621 tcon->retry = volume_info->retry;
2622 tcon->nocase = volume_info->nocase;
2623 tcon->local_lease = volume_info->local_lease;
2624 INIT_LIST_HEAD(&tcon->pending_opens);
2625
2626 spin_lock(&cifs_tcp_ses_lock);
2627 list_add(&tcon->tcon_list, &ses->tcon_list);
2628 spin_unlock(&cifs_tcp_ses_lock);
2629
2630 cifs_fscache_get_super_cookie(tcon);
2631
2632 return tcon;
2633
2634 out_fail:
2635 tconInfoFree(tcon);
2636 return ERR_PTR(rc);
2637 }
2638
2639 void
2640 cifs_put_tlink(struct tcon_link *tlink)
2641 {
2642 if (!tlink || IS_ERR(tlink))
2643 return;
2644
2645 if (!atomic_dec_and_test(&tlink->tl_count) ||
2646 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2647 tlink->tl_time = jiffies;
2648 return;
2649 }
2650
2651 if (!IS_ERR(tlink_tcon(tlink)))
2652 cifs_put_tcon(tlink_tcon(tlink));
2653 kfree(tlink);
2654 return;
2655 }
2656
2657 static inline struct tcon_link *
2658 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2659 {
2660 return cifs_sb->master_tlink;
2661 }
2662
2663 static int
2664 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2665 {
2666 struct cifs_sb_info *old = CIFS_SB(sb);
2667 struct cifs_sb_info *new = mnt_data->cifs_sb;
2668
2669 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2670 return 0;
2671
2672 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2673 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2674 return 0;
2675
2676 /*
2677 * We want to share sb only if we don't specify an r/wsize or
2678 * specified r/wsize is greater than or equal to existing one.
2679 */
2680 if (new->wsize && new->wsize < old->wsize)
2681 return 0;
2682
2683 if (new->rsize && new->rsize < old->rsize)
2684 return 0;
2685
2686 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2687 return 0;
2688
2689 if (old->mnt_file_mode != new->mnt_file_mode ||
2690 old->mnt_dir_mode != new->mnt_dir_mode)
2691 return 0;
2692
2693 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2694 return 0;
2695
2696 if (old->actimeo != new->actimeo)
2697 return 0;
2698
2699 return 1;
2700 }
2701
2702 int
2703 cifs_match_super(struct super_block *sb, void *data)
2704 {
2705 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2706 struct smb_vol *volume_info;
2707 struct cifs_sb_info *cifs_sb;
2708 struct TCP_Server_Info *tcp_srv;
2709 struct cifs_ses *ses;
2710 struct cifs_tcon *tcon;
2711 struct tcon_link *tlink;
2712 struct sockaddr_storage addr;
2713 int rc = 0;
2714
2715 memset(&addr, 0, sizeof(struct sockaddr_storage));
2716
2717 spin_lock(&cifs_tcp_ses_lock);
2718 cifs_sb = CIFS_SB(sb);
2719 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2720 if (IS_ERR(tlink)) {
2721 spin_unlock(&cifs_tcp_ses_lock);
2722 return rc;
2723 }
2724 tcon = tlink_tcon(tlink);
2725 ses = tcon->ses;
2726 tcp_srv = ses->server;
2727
2728 volume_info = mnt_data->vol;
2729
2730 if (!volume_info->UNCip || !volume_info->UNC)
2731 goto out;
2732
2733 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2734 volume_info->UNCip,
2735 strlen(volume_info->UNCip),
2736 volume_info->port);
2737 if (!rc)
2738 goto out;
2739
2740 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2741 !match_session(ses, volume_info) ||
2742 !match_tcon(tcon, volume_info->UNC)) {
2743 rc = 0;
2744 goto out;
2745 }
2746
2747 rc = compare_mount_options(sb, mnt_data);
2748 out:
2749 spin_unlock(&cifs_tcp_ses_lock);
2750 cifs_put_tlink(tlink);
2751 return rc;
2752 }
2753
2754 int
2755 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2756 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2757 struct dfs_info3_param **referrals, int remap)
2758 {
2759 char *temp_unc;
2760 int rc = 0;
2761
2762 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2763 return -ENOSYS;
2764
2765 *num_referrals = 0;
2766 *referrals = NULL;
2767
2768 if (ses->ipc_tid == 0) {
2769 temp_unc = kmalloc(2 /* for slashes */ +
2770 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2771 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2772 if (temp_unc == NULL)
2773 return -ENOMEM;
2774 temp_unc[0] = '\\';
2775 temp_unc[1] = '\\';
2776 strcpy(temp_unc + 2, ses->serverName);
2777 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2778 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2779 nls_codepage);
2780 cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
2781 kfree(temp_unc);
2782 }
2783 if (rc == 0)
2784 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2785 referrals, num_referrals,
2786 nls_codepage, remap);
2787 /*
2788 * BB - map targetUNCs to dfs_info3 structures, here or in
2789 * ses->server->ops->get_dfs_refer.
2790 */
2791
2792 return rc;
2793 }
2794
2795 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2796 static struct lock_class_key cifs_key[2];
2797 static struct lock_class_key cifs_slock_key[2];
2798
2799 static inline void
2800 cifs_reclassify_socket4(struct socket *sock)
2801 {
2802 struct sock *sk = sock->sk;
2803 BUG_ON(sock_owned_by_user(sk));
2804 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2805 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2806 }
2807
2808 static inline void
2809 cifs_reclassify_socket6(struct socket *sock)
2810 {
2811 struct sock *sk = sock->sk;
2812 BUG_ON(sock_owned_by_user(sk));
2813 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2814 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2815 }
2816 #else
2817 static inline void
2818 cifs_reclassify_socket4(struct socket *sock)
2819 {
2820 }
2821
2822 static inline void
2823 cifs_reclassify_socket6(struct socket *sock)
2824 {
2825 }
2826 #endif
2827
2828 /* See RFC1001 section 14 on representation of Netbios names */
2829 static void rfc1002mangle(char *target, char *source, unsigned int length)
2830 {
2831 unsigned int i, j;
2832
2833 for (i = 0, j = 0; i < (length); i++) {
2834 /* mask a nibble at a time and encode */
2835 target[j] = 'A' + (0x0F & (source[i] >> 4));
2836 target[j+1] = 'A' + (0x0F & source[i]);
2837 j += 2;
2838 }
2839
2840 }
2841
2842 static int
2843 bind_socket(struct TCP_Server_Info *server)
2844 {
2845 int rc = 0;
2846 if (server->srcaddr.ss_family != AF_UNSPEC) {
2847 /* Bind to the specified local IP address */
2848 struct socket *socket = server->ssocket;
2849 rc = socket->ops->bind(socket,
2850 (struct sockaddr *) &server->srcaddr,
2851 sizeof(server->srcaddr));
2852 if (rc < 0) {
2853 struct sockaddr_in *saddr4;
2854 struct sockaddr_in6 *saddr6;
2855 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2856 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2857 if (saddr6->sin6_family == AF_INET6)
2858 cERROR(1, "cifs: "
2859 "Failed to bind to: %pI6c, error: %d",
2860 &saddr6->sin6_addr, rc);
2861 else
2862 cERROR(1, "cifs: "
2863 "Failed to bind to: %pI4, error: %d",
2864 &saddr4->sin_addr.s_addr, rc);
2865 }
2866 }
2867 return rc;
2868 }
2869
2870 static int
2871 ip_rfc1001_connect(struct TCP_Server_Info *server)
2872 {
2873 int rc = 0;
2874 /*
2875 * some servers require RFC1001 sessinit before sending
2876 * negprot - BB check reconnection in case where second
2877 * sessinit is sent but no second negprot
2878 */
2879 struct rfc1002_session_packet *ses_init_buf;
2880 struct smb_hdr *smb_buf;
2881 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2882 GFP_KERNEL);
2883 if (ses_init_buf) {
2884 ses_init_buf->trailer.session_req.called_len = 32;
2885
2886 if (server->server_RFC1001_name &&
2887 server->server_RFC1001_name[0] != 0)
2888 rfc1002mangle(ses_init_buf->trailer.
2889 session_req.called_name,
2890 server->server_RFC1001_name,
2891 RFC1001_NAME_LEN_WITH_NULL);
2892 else
2893 rfc1002mangle(ses_init_buf->trailer.
2894 session_req.called_name,
2895 DEFAULT_CIFS_CALLED_NAME,
2896 RFC1001_NAME_LEN_WITH_NULL);
2897
2898 ses_init_buf->trailer.session_req.calling_len = 32;
2899
2900 /*
2901 * calling name ends in null (byte 16) from old smb
2902 * convention.
2903 */
2904 if (server->workstation_RFC1001_name &&
2905 server->workstation_RFC1001_name[0] != 0)
2906 rfc1002mangle(ses_init_buf->trailer.
2907 session_req.calling_name,
2908 server->workstation_RFC1001_name,
2909 RFC1001_NAME_LEN_WITH_NULL);
2910 else
2911 rfc1002mangle(ses_init_buf->trailer.
2912 session_req.calling_name,
2913 "LINUX_CIFS_CLNT",
2914 RFC1001_NAME_LEN_WITH_NULL);
2915
2916 ses_init_buf->trailer.session_req.scope1 = 0;
2917 ses_init_buf->trailer.session_req.scope2 = 0;
2918 smb_buf = (struct smb_hdr *)ses_init_buf;
2919
2920 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2921 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2922 rc = smb_send(server, smb_buf, 0x44);
2923 kfree(ses_init_buf);
2924 /*
2925 * RFC1001 layer in at least one server
2926 * requires very short break before negprot
2927 * presumably because not expecting negprot
2928 * to follow so fast. This is a simple
2929 * solution that works without
2930 * complicating the code and causes no
2931 * significant slowing down on mount
2932 * for everyone else
2933 */
2934 usleep_range(1000, 2000);
2935 }
2936 /*
2937 * else the negprot may still work without this
2938 * even though malloc failed
2939 */
2940
2941 return rc;
2942 }
2943
2944 static int
2945 generic_ip_connect(struct TCP_Server_Info *server)
2946 {
2947 int rc = 0;
2948 __be16 sport;
2949 int slen, sfamily;
2950 struct socket *socket = server->ssocket;
2951 struct sockaddr *saddr;
2952
2953 saddr = (struct sockaddr *) &server->dstaddr;
2954
2955 if (server->dstaddr.ss_family == AF_INET6) {
2956 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2957 slen = sizeof(struct sockaddr_in6);
2958 sfamily = AF_INET6;
2959 } else {
2960 sport = ((struct sockaddr_in *) saddr)->sin_port;
2961 slen = sizeof(struct sockaddr_in);
2962 sfamily = AF_INET;
2963 }
2964
2965 if (socket == NULL) {
2966 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2967 IPPROTO_TCP, &socket, 1);
2968 if (rc < 0) {
2969 cERROR(1, "Error %d creating socket", rc);
2970 server->ssocket = NULL;
2971 return rc;
2972 }
2973
2974 /* BB other socket options to set KEEPALIVE, NODELAY? */
2975 cFYI(1, "Socket created");
2976 server->ssocket = socket;
2977 socket->sk->sk_allocation = GFP_NOFS;
2978 if (sfamily == AF_INET6)
2979 cifs_reclassify_socket6(socket);
2980 else
2981 cifs_reclassify_socket4(socket);
2982 }
2983
2984 rc = bind_socket(server);
2985 if (rc < 0)
2986 return rc;
2987
2988 /*
2989 * Eventually check for other socket options to change from
2990 * the default. sock_setsockopt not used because it expects
2991 * user space buffer
2992 */
2993 socket->sk->sk_rcvtimeo = 7 * HZ;
2994 socket->sk->sk_sndtimeo = 5 * HZ;
2995
2996 /* make the bufsizes depend on wsize/rsize and max requests */
2997 if (server->noautotune) {
2998 if (socket->sk->sk_sndbuf < (200 * 1024))
2999 socket->sk->sk_sndbuf = 200 * 1024;
3000 if (socket->sk->sk_rcvbuf < (140 * 1024))
3001 socket->sk->sk_rcvbuf = 140 * 1024;
3002 }
3003
3004 if (server->tcp_nodelay) {
3005 int val = 1;
3006 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3007 (char *)&val, sizeof(val));
3008 if (rc)
3009 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3010 }
3011
3012 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3013 socket->sk->sk_sndbuf,
3014 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3015
3016 rc = socket->ops->connect(socket, saddr, slen, 0);
3017 if (rc < 0) {
3018 cFYI(1, "Error %d connecting to server", rc);
3019 sock_release(socket);
3020 server->ssocket = NULL;
3021 return rc;
3022 }
3023
3024 if (sport == htons(RFC1001_PORT))
3025 rc = ip_rfc1001_connect(server);
3026
3027 return rc;
3028 }
3029
3030 static int
3031 ip_connect(struct TCP_Server_Info *server)
3032 {
3033 __be16 *sport;
3034 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3035 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3036
3037 if (server->dstaddr.ss_family == AF_INET6)
3038 sport = &addr6->sin6_port;
3039 else
3040 sport = &addr->sin_port;
3041
3042 if (*sport == 0) {
3043 int rc;
3044
3045 /* try with 445 port at first */
3046 *sport = htons(CIFS_PORT);
3047
3048 rc = generic_ip_connect(server);
3049 if (rc >= 0)
3050 return rc;
3051
3052 /* if it failed, try with 139 port */
3053 *sport = htons(RFC1001_PORT);
3054 }
3055
3056 return generic_ip_connect(server);
3057 }
3058
3059 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3060 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3061 {
3062 /* if we are reconnecting then should we check to see if
3063 * any requested capabilities changed locally e.g. via
3064 * remount but we can not do much about it here
3065 * if they have (even if we could detect it by the following)
3066 * Perhaps we could add a backpointer to array of sb from tcon
3067 * or if we change to make all sb to same share the same
3068 * sb as NFS - then we only have one backpointer to sb.
3069 * What if we wanted to mount the server share twice once with
3070 * and once without posixacls or posix paths? */
3071 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3072
3073 if (vol_info && vol_info->no_linux_ext) {
3074 tcon->fsUnixInfo.Capability = 0;
3075 tcon->unix_ext = 0; /* Unix Extensions disabled */
3076 cFYI(1, "Linux protocol extensions disabled");
3077 return;
3078 } else if (vol_info)
3079 tcon->unix_ext = 1; /* Unix Extensions supported */
3080
3081 if (tcon->unix_ext == 0) {
3082 cFYI(1, "Unix extensions disabled so not set on reconnect");
3083 return;
3084 }
3085
3086 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3087 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3088 cFYI(1, "unix caps which server supports %lld", cap);
3089 /* check for reconnect case in which we do not
3090 want to change the mount behavior if we can avoid it */
3091 if (vol_info == NULL) {
3092 /* turn off POSIX ACL and PATHNAMES if not set
3093 originally at mount time */
3094 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3095 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3096 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3097 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3098 cERROR(1, "POSIXPATH support change");
3099 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3100 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3101 cERROR(1, "possible reconnect error");
3102 cERROR(1, "server disabled POSIX path support");
3103 }
3104 }
3105
3106 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3107 cERROR(1, "per-share encryption not supported yet");
3108
3109 cap &= CIFS_UNIX_CAP_MASK;
3110 if (vol_info && vol_info->no_psx_acl)
3111 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3112 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3113 cFYI(1, "negotiated posix acl support");
3114 if (cifs_sb)
3115 cifs_sb->mnt_cifs_flags |=
3116 CIFS_MOUNT_POSIXACL;
3117 }
3118
3119 if (vol_info && vol_info->posix_paths == 0)
3120 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3121 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3122 cFYI(1, "negotiate posix pathnames");
3123 if (cifs_sb)
3124 cifs_sb->mnt_cifs_flags |=
3125 CIFS_MOUNT_POSIX_PATHS;
3126 }
3127
3128 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3129 #ifdef CONFIG_CIFS_DEBUG2
3130 if (cap & CIFS_UNIX_FCNTL_CAP)
3131 cFYI(1, "FCNTL cap");
3132 if (cap & CIFS_UNIX_EXTATTR_CAP)
3133 cFYI(1, "EXTATTR cap");
3134 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3135 cFYI(1, "POSIX path cap");
3136 if (cap & CIFS_UNIX_XATTR_CAP)
3137 cFYI(1, "XATTR cap");
3138 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3139 cFYI(1, "POSIX ACL cap");
3140 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3141 cFYI(1, "very large read cap");
3142 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3143 cFYI(1, "very large write cap");
3144 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3145 cFYI(1, "transport encryption cap");
3146 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3147 cFYI(1, "mandatory transport encryption cap");
3148 #endif /* CIFS_DEBUG2 */
3149 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3150 if (vol_info == NULL) {
3151 cFYI(1, "resetting capabilities failed");
3152 } else
3153 cERROR(1, "Negotiating Unix capabilities "
3154 "with the server failed. Consider "
3155 "mounting with the Unix Extensions "
3156 "disabled if problems are found "
3157 "by specifying the nounix mount "
3158 "option.");
3159
3160 }
3161 }
3162 }
3163
3164 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3165 struct cifs_sb_info *cifs_sb)
3166 {
3167 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3168
3169 spin_lock_init(&cifs_sb->tlink_tree_lock);
3170 cifs_sb->tlink_tree = RB_ROOT;
3171
3172 /*
3173 * Temporarily set r/wsize for matching superblock. If we end up using
3174 * new sb then client will later negotiate it downward if needed.
3175 */
3176 cifs_sb->rsize = pvolume_info->rsize;
3177 cifs_sb->wsize = pvolume_info->wsize;
3178
3179 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3180 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3181 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3182 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3183 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3184 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3185
3186 cifs_sb->actimeo = pvolume_info->actimeo;
3187 cifs_sb->local_nls = pvolume_info->local_nls;
3188
3189 if (pvolume_info->noperm)
3190 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3191 if (pvolume_info->setuids)
3192 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3193 if (pvolume_info->server_ino)
3194 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3195 if (pvolume_info->remap)
3196 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3197 if (pvolume_info->no_xattr)
3198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3199 if (pvolume_info->sfu_emul)
3200 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3201 if (pvolume_info->nobrl)
3202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3203 if (pvolume_info->nostrictsync)
3204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3205 if (pvolume_info->mand_lock)
3206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3207 if (pvolume_info->rwpidforward)
3208 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3209 if (pvolume_info->cifs_acl)
3210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3211 if (pvolume_info->backupuid_specified) {
3212 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3213 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3214 }
3215 if (pvolume_info->backupgid_specified) {
3216 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3217 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3218 }
3219 if (pvolume_info->override_uid)
3220 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3221 if (pvolume_info->override_gid)
3222 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3223 if (pvolume_info->dynperm)
3224 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3225 if (pvolume_info->fsc)
3226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3227 if (pvolume_info->multiuser)
3228 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3229 CIFS_MOUNT_NO_PERM);
3230 if (pvolume_info->strict_io)
3231 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3232 if (pvolume_info->direct_io) {
3233 cFYI(1, "mounting share using direct i/o");
3234 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3235 }
3236 if (pvolume_info->mfsymlinks) {
3237 if (pvolume_info->sfu_emul) {
3238 cERROR(1, "mount option mfsymlinks ignored if sfu "
3239 "mount option is used");
3240 } else {
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3242 }
3243 }
3244
3245 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3246 cERROR(1, "mount option dynperm ignored if cifsacl "
3247 "mount option supported");
3248 }
3249
3250 static void
3251 cleanup_volume_info_contents(struct smb_vol *volume_info)
3252 {
3253 kfree(volume_info->username);
3254 kzfree(volume_info->password);
3255 if (volume_info->UNCip != volume_info->UNC + 2)
3256 kfree(volume_info->UNCip);
3257 kfree(volume_info->UNC);
3258 kfree(volume_info->domainname);
3259 kfree(volume_info->iocharset);
3260 kfree(volume_info->prepath);
3261 }
3262
3263 void
3264 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3265 {
3266 if (!volume_info)
3267 return;
3268 cleanup_volume_info_contents(volume_info);
3269 kfree(volume_info);
3270 }
3271
3272
3273 #ifdef CONFIG_CIFS_DFS_UPCALL
3274 /* build_path_to_root returns full path to root when
3275 * we do not have an exiting connection (tcon) */
3276 static char *
3277 build_unc_path_to_root(const struct smb_vol *vol,
3278 const struct cifs_sb_info *cifs_sb)
3279 {
3280 char *full_path, *pos;
3281 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
3282 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3283
3284 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3285 if (full_path == NULL)
3286 return ERR_PTR(-ENOMEM);
3287
3288 strncpy(full_path, vol->UNC, unc_len);
3289 pos = full_path + unc_len;
3290
3291 if (pplen) {
3292 strncpy(pos, vol->prepath, pplen);
3293 pos += pplen;
3294 }
3295
3296 *pos = '\0'; /* add trailing null */
3297 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3298 cFYI(1, "%s: full_path=%s", __func__, full_path);
3299 return full_path;
3300 }
3301
3302 /*
3303 * Perform a dfs referral query for a share and (optionally) prefix
3304 *
3305 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3306 * to a string containing updated options for the submount. Otherwise it
3307 * will be left untouched.
3308 *
3309 * Returns the rc from get_dfs_path to the caller, which can be used to
3310 * determine whether there were referrals.
3311 */
3312 static int
3313 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3314 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3315 int check_prefix)
3316 {
3317 int rc;
3318 unsigned int num_referrals = 0;
3319 struct dfs_info3_param *referrals = NULL;
3320 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3321
3322 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3323 if (IS_ERR(full_path))
3324 return PTR_ERR(full_path);
3325
3326 /* For DFS paths, skip the first '\' of the UNC */
3327 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3328
3329 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3330 &num_referrals, &referrals,
3331 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3332
3333 if (!rc && num_referrals > 0) {
3334 char *fake_devname = NULL;
3335
3336 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3337 full_path + 1, referrals,
3338 &fake_devname);
3339
3340 free_dfs_info_array(referrals, num_referrals);
3341
3342 if (IS_ERR(mdata)) {
3343 rc = PTR_ERR(mdata);
3344 mdata = NULL;
3345 } else {
3346 cleanup_volume_info_contents(volume_info);
3347 memset(volume_info, '\0', sizeof(*volume_info));
3348 rc = cifs_setup_volume_info(volume_info, mdata,
3349 fake_devname);
3350 }
3351 kfree(fake_devname);
3352 kfree(cifs_sb->mountdata);
3353 cifs_sb->mountdata = mdata;
3354 }
3355 kfree(full_path);
3356 return rc;
3357 }
3358 #endif
3359
3360 static int
3361 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3362 const char *devname)
3363 {
3364 int rc = 0;
3365
3366 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3367 return -EINVAL;
3368
3369
3370 if (volume_info->nullauth) {
3371 cFYI(1, "Anonymous login");
3372 kfree(volume_info->username);
3373 volume_info->username = NULL;
3374 } else if (volume_info->username) {
3375 /* BB fixme parse for domain name here */
3376 cFYI(1, "Username: %s", volume_info->username);
3377 } else {
3378 cifserror("No username specified");
3379 /* In userspace mount helper we can get user name from alternate
3380 locations such as env variables and files on disk */
3381 return -EINVAL;
3382 }
3383
3384 /* this is needed for ASCII cp to Unicode converts */
3385 if (volume_info->iocharset == NULL) {
3386 /* load_nls_default cannot return null */
3387 volume_info->local_nls = load_nls_default();
3388 } else {
3389 volume_info->local_nls = load_nls(volume_info->iocharset);
3390 if (volume_info->local_nls == NULL) {
3391 cERROR(1, "CIFS mount error: iocharset %s not found",
3392 volume_info->iocharset);
3393 return -ELIBACC;
3394 }
3395 }
3396
3397 return rc;
3398 }
3399
3400 struct smb_vol *
3401 cifs_get_volume_info(char *mount_data, const char *devname)
3402 {
3403 int rc;
3404 struct smb_vol *volume_info;
3405
3406 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3407 if (!volume_info)
3408 return ERR_PTR(-ENOMEM);
3409
3410 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3411 if (rc) {
3412 cifs_cleanup_volume_info(volume_info);
3413 volume_info = ERR_PTR(rc);
3414 }
3415
3416 return volume_info;
3417 }
3418
3419 int
3420 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3421 {
3422 int rc;
3423 unsigned int xid;
3424 struct cifs_ses *ses;
3425 struct cifs_tcon *tcon;
3426 struct TCP_Server_Info *server;
3427 char *full_path;
3428 struct tcon_link *tlink;
3429 #ifdef CONFIG_CIFS_DFS_UPCALL
3430 int referral_walks_count = 0;
3431 #endif
3432
3433 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3434 if (rc)
3435 return rc;
3436
3437 #ifdef CONFIG_CIFS_DFS_UPCALL
3438 try_mount_again:
3439 /* cleanup activities if we're chasing a referral */
3440 if (referral_walks_count) {
3441 if (tcon)
3442 cifs_put_tcon(tcon);
3443 else if (ses)
3444 cifs_put_smb_ses(ses);
3445
3446 free_xid(xid);
3447 }
3448 #endif
3449 rc = 0;
3450 tcon = NULL;
3451 ses = NULL;
3452 server = NULL;
3453 full_path = NULL;
3454 tlink = NULL;
3455
3456 xid = get_xid();
3457
3458 /* get a reference to a tcp session */
3459 server = cifs_get_tcp_session(volume_info);
3460 if (IS_ERR(server)) {
3461 rc = PTR_ERR(server);
3462 bdi_destroy(&cifs_sb->bdi);
3463 goto out;
3464 }
3465
3466 /* get a reference to a SMB session */
3467 ses = cifs_get_smb_ses(server, volume_info);
3468 if (IS_ERR(ses)) {
3469 rc = PTR_ERR(ses);
3470 ses = NULL;
3471 goto mount_fail_check;
3472 }
3473
3474 /* search for existing tcon to this server share */
3475 tcon = cifs_get_tcon(ses, volume_info);
3476 if (IS_ERR(tcon)) {
3477 rc = PTR_ERR(tcon);
3478 tcon = NULL;
3479 goto remote_path_check;
3480 }
3481
3482 /* tell server which Unix caps we support */
3483 if (cap_unix(tcon->ses)) {
3484 /* reset of caps checks mount to see if unix extensions
3485 disabled for just this mount */
3486 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3487 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3488 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3489 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3490 rc = -EACCES;
3491 goto mount_fail_check;
3492 }
3493 } else
3494 tcon->unix_ext = 0; /* server does not support them */
3495
3496 /* do not care if a following call succeed - informational */
3497 if (!tcon->ipc && server->ops->qfs_tcon)
3498 server->ops->qfs_tcon(xid, tcon);
3499
3500 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3501 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3502
3503 /* tune readahead according to rsize */
3504 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3505
3506 remote_path_check:
3507 #ifdef CONFIG_CIFS_DFS_UPCALL
3508 /*
3509 * Perform an unconditional check for whether there are DFS
3510 * referrals for this path without prefix, to provide support
3511 * for DFS referrals from w2k8 servers which don't seem to respond
3512 * with PATH_NOT_COVERED to requests that include the prefix.
3513 * Chase the referral if found, otherwise continue normally.
3514 */
3515 if (referral_walks_count == 0) {
3516 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3517 false);
3518 if (!refrc) {
3519 referral_walks_count++;
3520 goto try_mount_again;
3521 }
3522 }
3523 #endif
3524
3525 /* check if a whole path is not remote */
3526 if (!rc && tcon) {
3527 if (!server->ops->is_path_accessible) {
3528 rc = -ENOSYS;
3529 goto mount_fail_check;
3530 }
3531 /* build_path_to_root works only when we have a valid tcon */
3532 full_path = build_path_to_root(volume_info, cifs_sb, tcon);
3533 if (full_path == NULL) {
3534 rc = -ENOMEM;
3535 goto mount_fail_check;
3536 }
3537 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3538 full_path);
3539 if (rc != 0 && rc != -EREMOTE) {
3540 kfree(full_path);
3541 goto mount_fail_check;
3542 }
3543 kfree(full_path);
3544 }
3545
3546 /* get referral if needed */
3547 if (rc == -EREMOTE) {
3548 #ifdef CONFIG_CIFS_DFS_UPCALL
3549 if (referral_walks_count > MAX_NESTED_LINKS) {
3550 /*
3551 * BB: when we implement proper loop detection,
3552 * we will remove this check. But now we need it
3553 * to prevent an indefinite loop if 'DFS tree' is
3554 * misconfigured (i.e. has loops).
3555 */
3556 rc = -ELOOP;
3557 goto mount_fail_check;
3558 }
3559
3560 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3561
3562 if (!rc) {
3563 referral_walks_count++;
3564 goto try_mount_again;
3565 }
3566 goto mount_fail_check;
3567 #else /* No DFS support, return error on mount */
3568 rc = -EOPNOTSUPP;
3569 #endif
3570 }
3571
3572 if (rc)
3573 goto mount_fail_check;
3574
3575 /* now, hang the tcon off of the superblock */
3576 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3577 if (tlink == NULL) {
3578 rc = -ENOMEM;
3579 goto mount_fail_check;
3580 }
3581
3582 tlink->tl_uid = ses->linux_uid;
3583 tlink->tl_tcon = tcon;
3584 tlink->tl_time = jiffies;
3585 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3586 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3587
3588 cifs_sb->master_tlink = tlink;
3589 spin_lock(&cifs_sb->tlink_tree_lock);
3590 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3591 spin_unlock(&cifs_sb->tlink_tree_lock);
3592
3593 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3594 TLINK_IDLE_EXPIRE);
3595
3596 mount_fail_check:
3597 /* on error free sesinfo and tcon struct if needed */
3598 if (rc) {
3599 /* If find_unc succeeded then rc == 0 so we can not end */
3600 /* up accidentally freeing someone elses tcon struct */
3601 if (tcon)
3602 cifs_put_tcon(tcon);
3603 else if (ses)
3604 cifs_put_smb_ses(ses);
3605 else
3606 cifs_put_tcp_session(server);
3607 bdi_destroy(&cifs_sb->bdi);
3608 }
3609
3610 out:
3611 free_xid(xid);
3612 return rc;
3613 }
3614
3615 /*
3616 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3617 * pointer may be NULL.
3618 */
3619 int
3620 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3621 const char *tree, struct cifs_tcon *tcon,
3622 const struct nls_table *nls_codepage)
3623 {
3624 struct smb_hdr *smb_buffer;
3625 struct smb_hdr *smb_buffer_response;
3626 TCONX_REQ *pSMB;
3627 TCONX_RSP *pSMBr;
3628 unsigned char *bcc_ptr;
3629 int rc = 0;
3630 int length;
3631 __u16 bytes_left, count;
3632
3633 if (ses == NULL)
3634 return -EIO;
3635
3636 smb_buffer = cifs_buf_get();
3637 if (smb_buffer == NULL)
3638 return -ENOMEM;
3639
3640 smb_buffer_response = smb_buffer;
3641
3642 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3643 NULL /*no tid */ , 4 /*wct */ );
3644
3645 smb_buffer->Mid = get_next_mid(ses->server);
3646 smb_buffer->Uid = ses->Suid;
3647 pSMB = (TCONX_REQ *) smb_buffer;
3648 pSMBr = (TCONX_RSP *) smb_buffer_response;
3649
3650 pSMB->AndXCommand = 0xFF;
3651 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3652 bcc_ptr = &pSMB->Password[0];
3653 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3654 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3655 *bcc_ptr = 0; /* password is null byte */
3656 bcc_ptr++; /* skip password */
3657 /* already aligned so no need to do it below */
3658 } else {
3659 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3660 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3661 specified as required (when that support is added to
3662 the vfs in the future) as only NTLM or the much
3663 weaker LANMAN (which we do not send by default) is accepted
3664 by Samba (not sure whether other servers allow
3665 NTLMv2 password here) */
3666 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3667 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3668 (ses->server->secType == LANMAN))
3669 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3670 ses->server->sec_mode &
3671 SECMODE_PW_ENCRYPT ? true : false,
3672 bcc_ptr);
3673 else
3674 #endif /* CIFS_WEAK_PW_HASH */
3675 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3676 bcc_ptr, nls_codepage);
3677
3678 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3679 if (ses->capabilities & CAP_UNICODE) {
3680 /* must align unicode strings */
3681 *bcc_ptr = 0; /* null byte password */
3682 bcc_ptr++;
3683 }
3684 }
3685
3686 if (ses->server->sec_mode &
3687 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3688 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3689
3690 if (ses->capabilities & CAP_STATUS32) {
3691 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3692 }
3693 if (ses->capabilities & CAP_DFS) {
3694 smb_buffer->Flags2 |= SMBFLG2_DFS;
3695 }
3696 if (ses->capabilities & CAP_UNICODE) {
3697 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3698 length =
3699 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3700 6 /* max utf8 char length in bytes */ *
3701 (/* server len*/ + 256 /* share len */), nls_codepage);
3702 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3703 bcc_ptr += 2; /* skip trailing null */
3704 } else { /* ASCII */
3705 strcpy(bcc_ptr, tree);
3706 bcc_ptr += strlen(tree) + 1;
3707 }
3708 strcpy(bcc_ptr, "?????");
3709 bcc_ptr += strlen("?????");
3710 bcc_ptr += 1;
3711 count = bcc_ptr - &pSMB->Password[0];
3712 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3713 pSMB->hdr.smb_buf_length) + count);
3714 pSMB->ByteCount = cpu_to_le16(count);
3715
3716 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3717 0);
3718
3719 /* above now done in SendReceive */
3720 if ((rc == 0) && (tcon != NULL)) {
3721 bool is_unicode;
3722
3723 tcon->tidStatus = CifsGood;
3724 tcon->need_reconnect = false;
3725 tcon->tid = smb_buffer_response->Tid;
3726 bcc_ptr = pByteArea(smb_buffer_response);
3727 bytes_left = get_bcc(smb_buffer_response);
3728 length = strnlen(bcc_ptr, bytes_left - 2);
3729 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3730 is_unicode = true;
3731 else
3732 is_unicode = false;
3733
3734
3735 /* skip service field (NB: this field is always ASCII) */
3736 if (length == 3) {
3737 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3738 (bcc_ptr[2] == 'C')) {
3739 cFYI(1, "IPC connection");
3740 tcon->ipc = 1;
3741 }
3742 } else if (length == 2) {
3743 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3744 /* the most common case */
3745 cFYI(1, "disk share connection");
3746 }
3747 }
3748 bcc_ptr += length + 1;
3749 bytes_left -= (length + 1);
3750 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3751
3752 /* mostly informational -- no need to fail on error here */
3753 kfree(tcon->nativeFileSystem);
3754 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3755 bytes_left, is_unicode,
3756 nls_codepage);
3757
3758 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3759
3760 if ((smb_buffer_response->WordCount == 3) ||
3761 (smb_buffer_response->WordCount == 7))
3762 /* field is in same location */
3763 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3764 else
3765 tcon->Flags = 0;
3766 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3767 } else if ((rc == 0) && tcon == NULL) {
3768 /* all we need to save for IPC$ connection */
3769 ses->ipc_tid = smb_buffer_response->Tid;
3770 }
3771
3772 cifs_buf_release(smb_buffer);
3773 return rc;
3774 }
3775
3776 void
3777 cifs_umount(struct cifs_sb_info *cifs_sb)
3778 {
3779 struct rb_root *root = &cifs_sb->tlink_tree;
3780 struct rb_node *node;
3781 struct tcon_link *tlink;
3782
3783 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3784
3785 spin_lock(&cifs_sb->tlink_tree_lock);
3786 while ((node = rb_first(root))) {
3787 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3788 cifs_get_tlink(tlink);
3789 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3790 rb_erase(node, root);
3791
3792 spin_unlock(&cifs_sb->tlink_tree_lock);
3793 cifs_put_tlink(tlink);
3794 spin_lock(&cifs_sb->tlink_tree_lock);
3795 }
3796 spin_unlock(&cifs_sb->tlink_tree_lock);
3797
3798 bdi_destroy(&cifs_sb->bdi);
3799 kfree(cifs_sb->mountdata);
3800 unload_nls(cifs_sb->local_nls);
3801 kfree(cifs_sb);
3802 }
3803
3804 int
3805 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3806 {
3807 int rc = 0;
3808 struct TCP_Server_Info *server = ses->server;
3809
3810 if (!server->ops->need_neg || !server->ops->negotiate)
3811 return -ENOSYS;
3812
3813 /* only send once per connect */
3814 if (!server->ops->need_neg(server))
3815 return 0;
3816
3817 set_credits(server, 1);
3818
3819 rc = server->ops->negotiate(xid, ses);
3820 if (rc == 0) {
3821 spin_lock(&GlobalMid_Lock);
3822 if (server->tcpStatus == CifsNeedNegotiate)
3823 server->tcpStatus = CifsGood;
3824 else
3825 rc = -EHOSTDOWN;
3826 spin_unlock(&GlobalMid_Lock);
3827 }
3828
3829 return rc;
3830 }
3831
3832 int
3833 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3834 struct nls_table *nls_info)
3835 {
3836 int rc = -ENOSYS;
3837 struct TCP_Server_Info *server = ses->server;
3838
3839 ses->flags = 0;
3840 ses->capabilities = server->capabilities;
3841 if (linuxExtEnabled == 0)
3842 ses->capabilities &= (~server->vals->cap_unix);
3843
3844 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3845 server->sec_mode, server->capabilities, server->timeAdj);
3846
3847 if (server->ops->sess_setup)
3848 rc = server->ops->sess_setup(xid, ses, nls_info);
3849
3850 if (rc) {
3851 cERROR(1, "Send error in SessSetup = %d", rc);
3852 } else {
3853 mutex_lock(&ses->server->srv_mutex);
3854 if (!server->session_estab) {
3855 server->session_key.response = ses->auth_key.response;
3856 server->session_key.len = ses->auth_key.len;
3857 server->sequence_number = 0x2;
3858 server->session_estab = true;
3859 ses->auth_key.response = NULL;
3860 }
3861 mutex_unlock(&server->srv_mutex);
3862
3863 cFYI(1, "CIFS Session Established successfully");
3864 spin_lock(&GlobalMid_Lock);
3865 ses->status = CifsGood;
3866 ses->need_reconnect = false;
3867 spin_unlock(&GlobalMid_Lock);
3868 }
3869
3870 kfree(ses->auth_key.response);
3871 ses->auth_key.response = NULL;
3872 ses->auth_key.len = 0;
3873 kfree(ses->ntlmssp);
3874 ses->ntlmssp = NULL;
3875
3876 return rc;
3877 }
3878
3879 static int
3880 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3881 {
3882 switch (ses->server->secType) {
3883 case Kerberos:
3884 vol->secFlg = CIFSSEC_MUST_KRB5;
3885 return 0;
3886 case NTLMv2:
3887 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3888 break;
3889 case NTLM:
3890 vol->secFlg = CIFSSEC_MUST_NTLM;
3891 break;
3892 case RawNTLMSSP:
3893 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3894 break;
3895 case LANMAN:
3896 vol->secFlg = CIFSSEC_MUST_LANMAN;
3897 break;
3898 }
3899
3900 return cifs_set_cifscreds(vol, ses);
3901 }
3902
3903 static struct cifs_tcon *
3904 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3905 {
3906 int rc;
3907 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3908 struct cifs_ses *ses;
3909 struct cifs_tcon *tcon = NULL;
3910 struct smb_vol *vol_info;
3911
3912 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3913 if (vol_info == NULL)
3914 return ERR_PTR(-ENOMEM);
3915
3916 vol_info->local_nls = cifs_sb->local_nls;
3917 vol_info->linux_uid = fsuid;
3918 vol_info->cred_uid = fsuid;
3919 vol_info->UNC = master_tcon->treeName;
3920 vol_info->retry = master_tcon->retry;
3921 vol_info->nocase = master_tcon->nocase;
3922 vol_info->local_lease = master_tcon->local_lease;
3923 vol_info->no_linux_ext = !master_tcon->unix_ext;
3924
3925 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3926 if (rc) {
3927 tcon = ERR_PTR(rc);
3928 goto out;
3929 }
3930
3931 /* get a reference for the same TCP session */
3932 spin_lock(&cifs_tcp_ses_lock);
3933 ++master_tcon->ses->server->srv_count;
3934 spin_unlock(&cifs_tcp_ses_lock);
3935
3936 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3937 if (IS_ERR(ses)) {
3938 tcon = (struct cifs_tcon *)ses;
3939 cifs_put_tcp_session(master_tcon->ses->server);
3940 goto out;
3941 }
3942
3943 tcon = cifs_get_tcon(ses, vol_info);
3944 if (IS_ERR(tcon)) {
3945 cifs_put_smb_ses(ses);
3946 goto out;
3947 }
3948
3949 if (cap_unix(ses))
3950 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3951 out:
3952 kfree(vol_info->username);
3953 kfree(vol_info->password);
3954 kfree(vol_info);
3955
3956 return tcon;
3957 }
3958
3959 struct cifs_tcon *
3960 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3961 {
3962 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3963 }
3964
3965 static int
3966 cifs_sb_tcon_pending_wait(void *unused)
3967 {
3968 schedule();
3969 return signal_pending(current) ? -ERESTARTSYS : 0;
3970 }
3971
3972 /* find and return a tlink with given uid */
3973 static struct tcon_link *
3974 tlink_rb_search(struct rb_root *root, uid_t uid)
3975 {
3976 struct rb_node *node = root->rb_node;
3977 struct tcon_link *tlink;
3978
3979 while (node) {
3980 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3981
3982 if (tlink->tl_uid > uid)
3983 node = node->rb_left;
3984 else if (tlink->tl_uid < uid)
3985 node = node->rb_right;
3986 else
3987 return tlink;
3988 }
3989 return NULL;
3990 }
3991
3992 /* insert a tcon_link into the tree */
3993 static void
3994 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3995 {
3996 struct rb_node **new = &(root->rb_node), *parent = NULL;
3997 struct tcon_link *tlink;
3998
3999 while (*new) {
4000 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4001 parent = *new;
4002
4003 if (tlink->tl_uid > new_tlink->tl_uid)
4004 new = &((*new)->rb_left);
4005 else
4006 new = &((*new)->rb_right);
4007 }
4008
4009 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4010 rb_insert_color(&new_tlink->tl_rbnode, root);
4011 }
4012
4013 /*
4014 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4015 * current task.
4016 *
4017 * If the superblock doesn't refer to a multiuser mount, then just return
4018 * the master tcon for the mount.
4019 *
4020 * First, search the rbtree for an existing tcon for this fsuid. If one
4021 * exists, then check to see if it's pending construction. If it is then wait
4022 * for construction to complete. Once it's no longer pending, check to see if
4023 * it failed and either return an error or retry construction, depending on
4024 * the timeout.
4025 *
4026 * If one doesn't exist then insert a new tcon_link struct into the tree and
4027 * try to construct a new one.
4028 */
4029 struct tcon_link *
4030 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4031 {
4032 int ret;
4033 uid_t fsuid = current_fsuid();
4034 struct tcon_link *tlink, *newtlink;
4035
4036 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4037 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4038
4039 spin_lock(&cifs_sb->tlink_tree_lock);
4040 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4041 if (tlink)
4042 cifs_get_tlink(tlink);
4043 spin_unlock(&cifs_sb->tlink_tree_lock);
4044
4045 if (tlink == NULL) {
4046 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4047 if (newtlink == NULL)
4048 return ERR_PTR(-ENOMEM);
4049 newtlink->tl_uid = fsuid;
4050 newtlink->tl_tcon = ERR_PTR(-EACCES);
4051 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4052 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4053 cifs_get_tlink(newtlink);
4054
4055 spin_lock(&cifs_sb->tlink_tree_lock);
4056 /* was one inserted after previous search? */
4057 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4058 if (tlink) {
4059 cifs_get_tlink(tlink);
4060 spin_unlock(&cifs_sb->tlink_tree_lock);
4061 kfree(newtlink);
4062 goto wait_for_construction;
4063 }
4064 tlink = newtlink;
4065 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4066 spin_unlock(&cifs_sb->tlink_tree_lock);
4067 } else {
4068 wait_for_construction:
4069 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4070 cifs_sb_tcon_pending_wait,
4071 TASK_INTERRUPTIBLE);
4072 if (ret) {
4073 cifs_put_tlink(tlink);
4074 return ERR_PTR(ret);
4075 }
4076
4077 /* if it's good, return it */
4078 if (!IS_ERR(tlink->tl_tcon))
4079 return tlink;
4080
4081 /* return error if we tried this already recently */
4082 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4083 cifs_put_tlink(tlink);
4084 return ERR_PTR(-EACCES);
4085 }
4086
4087 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4088 goto wait_for_construction;
4089 }
4090
4091 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4092 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4093 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4094
4095 if (IS_ERR(tlink->tl_tcon)) {
4096 cifs_put_tlink(tlink);
4097 return ERR_PTR(-EACCES);
4098 }
4099
4100 return tlink;
4101 }
4102
4103 /*
4104 * periodic workqueue job that scans tcon_tree for a superblock and closes
4105 * out tcons.
4106 */
4107 static void
4108 cifs_prune_tlinks(struct work_struct *work)
4109 {
4110 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4111 prune_tlinks.work);
4112 struct rb_root *root = &cifs_sb->tlink_tree;
4113 struct rb_node *node = rb_first(root);
4114 struct rb_node *tmp;
4115 struct tcon_link *tlink;
4116
4117 /*
4118 * Because we drop the spinlock in the loop in order to put the tlink
4119 * it's not guarded against removal of links from the tree. The only
4120 * places that remove entries from the tree are this function and
4121 * umounts. Because this function is non-reentrant and is canceled
4122 * before umount can proceed, this is safe.
4123 */
4124 spin_lock(&cifs_sb->tlink_tree_lock);
4125 node = rb_first(root);
4126 while (node != NULL) {
4127 tmp = node;
4128 node = rb_next(tmp);
4129 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4130
4131 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4132 atomic_read(&tlink->tl_count) != 0 ||
4133 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4134 continue;
4135
4136 cifs_get_tlink(tlink);
4137 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4138 rb_erase(tmp, root);
4139
4140 spin_unlock(&cifs_sb->tlink_tree_lock);
4141 cifs_put_tlink(tlink);
4142 spin_lock(&cifs_sb->tlink_tree_lock);
4143 }
4144 spin_unlock(&cifs_sb->tlink_tree_lock);
4145
4146 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4147 TLINK_IDLE_EXPIRE);
4148 }
Linux kernel - Deliverables
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