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ARM: OMAP3: Fix iva2_pwrdm settings for 3703
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
42 #include <net/ipv6.h>
43 #include <linux/parser.h>
44
45 #include "cifspdu.h"
46 #include "cifsglob.h"
47 #include "cifsproto.h"
48 #include "cifs_unicode.h"
49 #include "cifs_debug.h"
50 #include "cifs_fs_sb.h"
51 #include "ntlmssp.h"
52 #include "nterr.h"
53 #include "rfc1002pdu.h"
54 #include "fscache.h"
55
56 #define CIFS_PORT 445
57 #define RFC1001_PORT 139
58
59 extern mempool_t *cifs_req_poolp;
60
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
64
65 enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapchars, Opt_nomapchars, Opt_sfu,
74 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
75 Opt_noposixpaths, Opt_nounix,
76 Opt_nocase,
77 Opt_brl, Opt_nobrl,
78 Opt_forcemandatorylock, Opt_setuids,
79 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
80 Opt_nohard, Opt_nosoft,
81 Opt_nointr, Opt_intr,
82 Opt_nostrictsync, Opt_strictsync,
83 Opt_serverino, Opt_noserverino,
84 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
85 Opt_acl, Opt_noacl, Opt_locallease,
86 Opt_sign, Opt_seal, Opt_noac,
87 Opt_fsc, Opt_mfsymlinks,
88 Opt_multiuser, Opt_sloppy,
89
90 /* Mount options which take numeric value */
91 Opt_backupuid, Opt_backupgid, Opt_uid,
92 Opt_cruid, Opt_gid, Opt_file_mode,
93 Opt_dirmode, Opt_port,
94 Opt_rsize, Opt_wsize, Opt_actimeo,
95
96 /* Mount options which take string value */
97 Opt_user, Opt_pass, Opt_ip,
98 Opt_domain, Opt_srcaddr, Opt_iocharset,
99 Opt_netbiosname, Opt_servern,
100 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
101
102 /* Mount options to be ignored */
103 Opt_ignore,
104
105 /* Options which could be blank */
106 Opt_blank_pass,
107 Opt_blank_user,
108 Opt_blank_ip,
109
110 Opt_err
111 };
112
113 static const match_table_t cifs_mount_option_tokens = {
114
115 { Opt_user_xattr, "user_xattr" },
116 { Opt_nouser_xattr, "nouser_xattr" },
117 { Opt_forceuid, "forceuid" },
118 { Opt_noforceuid, "noforceuid" },
119 { Opt_forcegid, "forcegid" },
120 { Opt_noforcegid, "noforcegid" },
121 { Opt_noblocksend, "noblocksend" },
122 { Opt_noautotune, "noautotune" },
123 { Opt_hard, "hard" },
124 { Opt_soft, "soft" },
125 { Opt_perm, "perm" },
126 { Opt_noperm, "noperm" },
127 { Opt_mapchars, "mapchars" },
128 { Opt_nomapchars, "nomapchars" },
129 { Opt_sfu, "sfu" },
130 { Opt_nosfu, "nosfu" },
131 { Opt_nodfs, "nodfs" },
132 { Opt_posixpaths, "posixpaths" },
133 { Opt_noposixpaths, "noposixpaths" },
134 { Opt_nounix, "nounix" },
135 { Opt_nounix, "nolinux" },
136 { Opt_nocase, "nocase" },
137 { Opt_nocase, "ignorecase" },
138 { Opt_brl, "brl" },
139 { Opt_nobrl, "nobrl" },
140 { Opt_nobrl, "nolock" },
141 { Opt_forcemandatorylock, "forcemandatorylock" },
142 { Opt_forcemandatorylock, "forcemand" },
143 { Opt_setuids, "setuids" },
144 { Opt_nosetuids, "nosetuids" },
145 { Opt_dynperm, "dynperm" },
146 { Opt_nodynperm, "nodynperm" },
147 { Opt_nohard, "nohard" },
148 { Opt_nosoft, "nosoft" },
149 { Opt_nointr, "nointr" },
150 { Opt_intr, "intr" },
151 { Opt_nostrictsync, "nostrictsync" },
152 { Opt_strictsync, "strictsync" },
153 { Opt_serverino, "serverino" },
154 { Opt_noserverino, "noserverino" },
155 { Opt_rwpidforward, "rwpidforward" },
156 { Opt_cifsacl, "cifsacl" },
157 { Opt_nocifsacl, "nocifsacl" },
158 { Opt_acl, "acl" },
159 { Opt_noacl, "noacl" },
160 { Opt_locallease, "locallease" },
161 { Opt_sign, "sign" },
162 { Opt_seal, "seal" },
163 { Opt_noac, "noac" },
164 { Opt_fsc, "fsc" },
165 { Opt_mfsymlinks, "mfsymlinks" },
166 { Opt_multiuser, "multiuser" },
167 { Opt_sloppy, "sloppy" },
168
169 { Opt_backupuid, "backupuid=%s" },
170 { Opt_backupgid, "backupgid=%s" },
171 { Opt_uid, "uid=%s" },
172 { Opt_cruid, "cruid=%s" },
173 { Opt_gid, "gid=%s" },
174 { Opt_file_mode, "file_mode=%s" },
175 { Opt_dirmode, "dirmode=%s" },
176 { Opt_dirmode, "dir_mode=%s" },
177 { Opt_port, "port=%s" },
178 { Opt_rsize, "rsize=%s" },
179 { Opt_wsize, "wsize=%s" },
180 { Opt_actimeo, "actimeo=%s" },
181
182 { Opt_blank_user, "user=" },
183 { Opt_blank_user, "username=" },
184 { Opt_user, "user=%s" },
185 { Opt_user, "username=%s" },
186 { Opt_blank_pass, "pass=" },
187 { Opt_blank_pass, "password=" },
188 { Opt_pass, "pass=%s" },
189 { Opt_pass, "password=%s" },
190 { Opt_blank_ip, "ip=" },
191 { Opt_blank_ip, "addr=" },
192 { Opt_ip, "ip=%s" },
193 { Opt_ip, "addr=%s" },
194 { Opt_ignore, "unc=%s" },
195 { Opt_ignore, "target=%s" },
196 { Opt_ignore, "path=%s" },
197 { Opt_domain, "dom=%s" },
198 { Opt_domain, "domain=%s" },
199 { Opt_domain, "workgroup=%s" },
200 { Opt_srcaddr, "srcaddr=%s" },
201 { Opt_ignore, "prefixpath=%s" },
202 { Opt_iocharset, "iocharset=%s" },
203 { Opt_netbiosname, "netbiosname=%s" },
204 { Opt_servern, "servern=%s" },
205 { Opt_ver, "ver=%s" },
206 { Opt_vers, "vers=%s" },
207 { Opt_sec, "sec=%s" },
208 { Opt_cache, "cache=%s" },
209
210 { Opt_ignore, "cred" },
211 { Opt_ignore, "credentials" },
212 { Opt_ignore, "cred=%s" },
213 { Opt_ignore, "credentials=%s" },
214 { Opt_ignore, "guest" },
215 { Opt_ignore, "rw" },
216 { Opt_ignore, "ro" },
217 { Opt_ignore, "suid" },
218 { Opt_ignore, "nosuid" },
219 { Opt_ignore, "exec" },
220 { Opt_ignore, "noexec" },
221 { Opt_ignore, "nodev" },
222 { Opt_ignore, "noauto" },
223 { Opt_ignore, "dev" },
224 { Opt_ignore, "mand" },
225 { Opt_ignore, "nomand" },
226 { Opt_ignore, "_netdev" },
227
228 { Opt_err, NULL }
229 };
230
231 enum {
232 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
233 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
234 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
235 Opt_sec_ntlmv2i, Opt_sec_lanman,
236 Opt_sec_none,
237
238 Opt_sec_err
239 };
240
241 static const match_table_t cifs_secflavor_tokens = {
242 { Opt_sec_krb5, "krb5" },
243 { Opt_sec_krb5i, "krb5i" },
244 { Opt_sec_krb5p, "krb5p" },
245 { Opt_sec_ntlmsspi, "ntlmsspi" },
246 { Opt_sec_ntlmssp, "ntlmssp" },
247 { Opt_ntlm, "ntlm" },
248 { Opt_sec_ntlmi, "ntlmi" },
249 { Opt_sec_ntlmv2, "nontlm" },
250 { Opt_sec_ntlmv2, "ntlmv2" },
251 { Opt_sec_ntlmv2i, "ntlmv2i" },
252 { Opt_sec_lanman, "lanman" },
253 { Opt_sec_none, "none" },
254
255 { Opt_sec_err, NULL }
256 };
257
258 /* cache flavors */
259 enum {
260 Opt_cache_loose,
261 Opt_cache_strict,
262 Opt_cache_none,
263 Opt_cache_err
264 };
265
266 static const match_table_t cifs_cacheflavor_tokens = {
267 { Opt_cache_loose, "loose" },
268 { Opt_cache_strict, "strict" },
269 { Opt_cache_none, "none" },
270 { Opt_cache_err, NULL }
271 };
272
273 static const match_table_t cifs_smb_version_tokens = {
274 { Smb_1, SMB1_VERSION_STRING },
275 { Smb_20, SMB20_VERSION_STRING},
276 { Smb_21, SMB21_VERSION_STRING },
277 { Smb_30, SMB30_VERSION_STRING },
278 };
279
280 static int ip_connect(struct TCP_Server_Info *server);
281 static int generic_ip_connect(struct TCP_Server_Info *server);
282 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
283 static void cifs_prune_tlinks(struct work_struct *work);
284 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
285 const char *devname);
286
287 /*
288 * cifs tcp session reconnection
289 *
290 * mark tcp session as reconnecting so temporarily locked
291 * mark all smb sessions as reconnecting for tcp session
292 * reconnect tcp session
293 * wake up waiters on reconnection? - (not needed currently)
294 */
295 int
296 cifs_reconnect(struct TCP_Server_Info *server)
297 {
298 int rc = 0;
299 struct list_head *tmp, *tmp2;
300 struct cifs_ses *ses;
301 struct cifs_tcon *tcon;
302 struct mid_q_entry *mid_entry;
303 struct list_head retry_list;
304
305 spin_lock(&GlobalMid_Lock);
306 if (server->tcpStatus == CifsExiting) {
307 /* the demux thread will exit normally
308 next time through the loop */
309 spin_unlock(&GlobalMid_Lock);
310 return rc;
311 } else
312 server->tcpStatus = CifsNeedReconnect;
313 spin_unlock(&GlobalMid_Lock);
314 server->maxBuf = 0;
315 #ifdef CONFIG_CIFS_SMB2
316 server->max_read = 0;
317 #endif
318
319 cifs_dbg(FYI, "Reconnecting tcp session\n");
320
321 /* before reconnecting the tcp session, mark the smb session (uid)
322 and the tid bad so they are not used until reconnected */
323 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
324 __func__);
325 spin_lock(&cifs_tcp_ses_lock);
326 list_for_each(tmp, &server->smb_ses_list) {
327 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
328 ses->need_reconnect = true;
329 ses->ipc_tid = 0;
330 list_for_each(tmp2, &ses->tcon_list) {
331 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
332 tcon->need_reconnect = true;
333 }
334 }
335 spin_unlock(&cifs_tcp_ses_lock);
336
337 /* do not want to be sending data on a socket we are freeing */
338 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
339 mutex_lock(&server->srv_mutex);
340 if (server->ssocket) {
341 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
342 server->ssocket->state, server->ssocket->flags);
343 kernel_sock_shutdown(server->ssocket, SHUT_WR);
344 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
345 server->ssocket->state, server->ssocket->flags);
346 sock_release(server->ssocket);
347 server->ssocket = NULL;
348 }
349 server->sequence_number = 0;
350 server->session_estab = false;
351 kfree(server->session_key.response);
352 server->session_key.response = NULL;
353 server->session_key.len = 0;
354 server->lstrp = jiffies;
355 mutex_unlock(&server->srv_mutex);
356
357 /* mark submitted MIDs for retry and issue callback */
358 INIT_LIST_HEAD(&retry_list);
359 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
360 spin_lock(&GlobalMid_Lock);
361 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
362 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
363 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
364 mid_entry->mid_state = MID_RETRY_NEEDED;
365 list_move(&mid_entry->qhead, &retry_list);
366 }
367 spin_unlock(&GlobalMid_Lock);
368
369 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
370 list_for_each_safe(tmp, tmp2, &retry_list) {
371 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
372 list_del_init(&mid_entry->qhead);
373 mid_entry->callback(mid_entry);
374 }
375
376 do {
377 try_to_freeze();
378
379 /* we should try only the port we connected to before */
380 rc = generic_ip_connect(server);
381 if (rc) {
382 cifs_dbg(FYI, "reconnect error %d\n", rc);
383 msleep(3000);
384 } else {
385 atomic_inc(&tcpSesReconnectCount);
386 spin_lock(&GlobalMid_Lock);
387 if (server->tcpStatus != CifsExiting)
388 server->tcpStatus = CifsNeedNegotiate;
389 spin_unlock(&GlobalMid_Lock);
390 }
391 } while (server->tcpStatus == CifsNeedReconnect);
392
393 return rc;
394 }
395
396 static void
397 cifs_echo_request(struct work_struct *work)
398 {
399 int rc;
400 struct TCP_Server_Info *server = container_of(work,
401 struct TCP_Server_Info, echo.work);
402
403 /*
404 * We cannot send an echo if it is disabled or until the
405 * NEGOTIATE_PROTOCOL request is done, which is indicated by
406 * server->ops->need_neg() == true. Also, no need to ping if
407 * we got a response recently.
408 */
409 if (!server->ops->need_neg || server->ops->need_neg(server) ||
410 (server->ops->can_echo && !server->ops->can_echo(server)) ||
411 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
412 goto requeue_echo;
413
414 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
415 if (rc)
416 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
417 server->hostname);
418
419 requeue_echo:
420 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
421 }
422
423 static bool
424 allocate_buffers(struct TCP_Server_Info *server)
425 {
426 if (!server->bigbuf) {
427 server->bigbuf = (char *)cifs_buf_get();
428 if (!server->bigbuf) {
429 cifs_dbg(VFS, "No memory for large SMB response\n");
430 msleep(3000);
431 /* retry will check if exiting */
432 return false;
433 }
434 } else if (server->large_buf) {
435 /* we are reusing a dirty large buf, clear its start */
436 memset(server->bigbuf, 0, HEADER_SIZE(server));
437 }
438
439 if (!server->smallbuf) {
440 server->smallbuf = (char *)cifs_small_buf_get();
441 if (!server->smallbuf) {
442 cifs_dbg(VFS, "No memory for SMB response\n");
443 msleep(1000);
444 /* retry will check if exiting */
445 return false;
446 }
447 /* beginning of smb buffer is cleared in our buf_get */
448 } else {
449 /* if existing small buf clear beginning */
450 memset(server->smallbuf, 0, HEADER_SIZE(server));
451 }
452
453 return true;
454 }
455
456 static bool
457 server_unresponsive(struct TCP_Server_Info *server)
458 {
459 /*
460 * We need to wait 2 echo intervals to make sure we handle such
461 * situations right:
462 * 1s client sends a normal SMB request
463 * 2s client gets a response
464 * 30s echo workqueue job pops, and decides we got a response recently
465 * and don't need to send another
466 * ...
467 * 65s kernel_recvmsg times out, and we see that we haven't gotten
468 * a response in >60s.
469 */
470 if (server->tcpStatus == CifsGood &&
471 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
472 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
473 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
474 cifs_reconnect(server);
475 wake_up(&server->response_q);
476 return true;
477 }
478
479 return false;
480 }
481
482 /*
483 * kvec_array_init - clone a kvec array, and advance into it
484 * @new: pointer to memory for cloned array
485 * @iov: pointer to original array
486 * @nr_segs: number of members in original array
487 * @bytes: number of bytes to advance into the cloned array
488 *
489 * This function will copy the array provided in iov to a section of memory
490 * and advance the specified number of bytes into the new array. It returns
491 * the number of segments in the new array. "new" must be at least as big as
492 * the original iov array.
493 */
494 static unsigned int
495 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
496 size_t bytes)
497 {
498 size_t base = 0;
499
500 while (bytes || !iov->iov_len) {
501 int copy = min(bytes, iov->iov_len);
502
503 bytes -= copy;
504 base += copy;
505 if (iov->iov_len == base) {
506 iov++;
507 nr_segs--;
508 base = 0;
509 }
510 }
511 memcpy(new, iov, sizeof(*iov) * nr_segs);
512 new->iov_base += base;
513 new->iov_len -= base;
514 return nr_segs;
515 }
516
517 static struct kvec *
518 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
519 {
520 struct kvec *new_iov;
521
522 if (server->iov && nr_segs <= server->nr_iov)
523 return server->iov;
524
525 /* not big enough -- allocate a new one and release the old */
526 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
527 if (new_iov) {
528 kfree(server->iov);
529 server->iov = new_iov;
530 server->nr_iov = nr_segs;
531 }
532 return new_iov;
533 }
534
535 int
536 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
537 unsigned int nr_segs, unsigned int to_read)
538 {
539 int length = 0;
540 int total_read;
541 unsigned int segs;
542 struct msghdr smb_msg;
543 struct kvec *iov;
544
545 iov = get_server_iovec(server, nr_segs);
546 if (!iov)
547 return -ENOMEM;
548
549 smb_msg.msg_control = NULL;
550 smb_msg.msg_controllen = 0;
551
552 for (total_read = 0; to_read; total_read += length, to_read -= length) {
553 try_to_freeze();
554
555 if (server_unresponsive(server)) {
556 total_read = -EAGAIN;
557 break;
558 }
559
560 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
561
562 length = kernel_recvmsg(server->ssocket, &smb_msg,
563 iov, segs, to_read, 0);
564
565 if (server->tcpStatus == CifsExiting) {
566 total_read = -ESHUTDOWN;
567 break;
568 } else if (server->tcpStatus == CifsNeedReconnect) {
569 cifs_reconnect(server);
570 total_read = -EAGAIN;
571 break;
572 } else if (length == -ERESTARTSYS ||
573 length == -EAGAIN ||
574 length == -EINTR) {
575 /*
576 * Minimum sleep to prevent looping, allowing socket
577 * to clear and app threads to set tcpStatus
578 * CifsNeedReconnect if server hung.
579 */
580 usleep_range(1000, 2000);
581 length = 0;
582 continue;
583 } else if (length <= 0) {
584 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
585 "got %d", to_read, length);
586 cifs_reconnect(server);
587 total_read = -EAGAIN;
588 break;
589 }
590 }
591 return total_read;
592 }
593
594 int
595 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
596 unsigned int to_read)
597 {
598 struct kvec iov;
599
600 iov.iov_base = buf;
601 iov.iov_len = to_read;
602
603 return cifs_readv_from_socket(server, &iov, 1, to_read);
604 }
605
606 static bool
607 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
608 {
609 /*
610 * The first byte big endian of the length field,
611 * is actually not part of the length but the type
612 * with the most common, zero, as regular data.
613 */
614 switch (type) {
615 case RFC1002_SESSION_MESSAGE:
616 /* Regular SMB response */
617 return true;
618 case RFC1002_SESSION_KEEP_ALIVE:
619 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
620 break;
621 case RFC1002_POSITIVE_SESSION_RESPONSE:
622 cifs_dbg(FYI, "RFC 1002 positive session response\n");
623 break;
624 case RFC1002_NEGATIVE_SESSION_RESPONSE:
625 /*
626 * We get this from Windows 98 instead of an error on
627 * SMB negprot response.
628 */
629 cifs_dbg(FYI, "RFC 1002 negative session response\n");
630 /* give server a second to clean up */
631 msleep(1000);
632 /*
633 * Always try 445 first on reconnect since we get NACK
634 * on some if we ever connected to port 139 (the NACK
635 * is since we do not begin with RFC1001 session
636 * initialize frame).
637 */
638 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
639 cifs_reconnect(server);
640 wake_up(&server->response_q);
641 break;
642 default:
643 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
644 cifs_reconnect(server);
645 }
646
647 return false;
648 }
649
650 void
651 dequeue_mid(struct mid_q_entry *mid, bool malformed)
652 {
653 #ifdef CONFIG_CIFS_STATS2
654 mid->when_received = jiffies;
655 #endif
656 spin_lock(&GlobalMid_Lock);
657 if (!malformed)
658 mid->mid_state = MID_RESPONSE_RECEIVED;
659 else
660 mid->mid_state = MID_RESPONSE_MALFORMED;
661 list_del_init(&mid->qhead);
662 spin_unlock(&GlobalMid_Lock);
663 }
664
665 static void
666 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
667 char *buf, int malformed)
668 {
669 if (server->ops->check_trans2 &&
670 server->ops->check_trans2(mid, server, buf, malformed))
671 return;
672 mid->resp_buf = buf;
673 mid->large_buf = server->large_buf;
674 /* Was previous buf put in mpx struct for multi-rsp? */
675 if (!mid->multiRsp) {
676 /* smb buffer will be freed by user thread */
677 if (server->large_buf)
678 server->bigbuf = NULL;
679 else
680 server->smallbuf = NULL;
681 }
682 dequeue_mid(mid, malformed);
683 }
684
685 static void clean_demultiplex_info(struct TCP_Server_Info *server)
686 {
687 int length;
688
689 /* take it off the list, if it's not already */
690 spin_lock(&cifs_tcp_ses_lock);
691 list_del_init(&server->tcp_ses_list);
692 spin_unlock(&cifs_tcp_ses_lock);
693
694 spin_lock(&GlobalMid_Lock);
695 server->tcpStatus = CifsExiting;
696 spin_unlock(&GlobalMid_Lock);
697 wake_up_all(&server->response_q);
698
699 /* check if we have blocked requests that need to free */
700 spin_lock(&server->req_lock);
701 if (server->credits <= 0)
702 server->credits = 1;
703 spin_unlock(&server->req_lock);
704 /*
705 * Although there should not be any requests blocked on this queue it
706 * can not hurt to be paranoid and try to wake up requests that may
707 * haven been blocked when more than 50 at time were on the wire to the
708 * same server - they now will see the session is in exit state and get
709 * out of SendReceive.
710 */
711 wake_up_all(&server->request_q);
712 /* give those requests time to exit */
713 msleep(125);
714
715 if (server->ssocket) {
716 sock_release(server->ssocket);
717 server->ssocket = NULL;
718 }
719
720 if (!list_empty(&server->pending_mid_q)) {
721 struct list_head dispose_list;
722 struct mid_q_entry *mid_entry;
723 struct list_head *tmp, *tmp2;
724
725 INIT_LIST_HEAD(&dispose_list);
726 spin_lock(&GlobalMid_Lock);
727 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
728 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
729 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
730 mid_entry->mid_state = MID_SHUTDOWN;
731 list_move(&mid_entry->qhead, &dispose_list);
732 }
733 spin_unlock(&GlobalMid_Lock);
734
735 /* now walk dispose list and issue callbacks */
736 list_for_each_safe(tmp, tmp2, &dispose_list) {
737 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
738 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
739 list_del_init(&mid_entry->qhead);
740 mid_entry->callback(mid_entry);
741 }
742 /* 1/8th of sec is more than enough time for them to exit */
743 msleep(125);
744 }
745
746 if (!list_empty(&server->pending_mid_q)) {
747 /*
748 * mpx threads have not exited yet give them at least the smb
749 * send timeout time for long ops.
750 *
751 * Due to delays on oplock break requests, we need to wait at
752 * least 45 seconds before giving up on a request getting a
753 * response and going ahead and killing cifsd.
754 */
755 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
756 msleep(46000);
757 /*
758 * If threads still have not exited they are probably never
759 * coming home not much else we can do but free the memory.
760 */
761 }
762
763 kfree(server->hostname);
764 kfree(server->iov);
765 kfree(server);
766
767 length = atomic_dec_return(&tcpSesAllocCount);
768 if (length > 0)
769 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
770 GFP_KERNEL);
771 }
772
773 static int
774 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
775 {
776 int length;
777 char *buf = server->smallbuf;
778 unsigned int pdu_length = get_rfc1002_length(buf);
779
780 /* make sure this will fit in a large buffer */
781 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
782 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", 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 cifs_dbg(FYI, "Demultiplex PID: %d\n", 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 cifs_dbg(FYI, "RFC1002 header 0x%x\n", 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 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
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 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
910 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 static int get_option_uid(substring_t args[], kuid_t *result)
986 {
987 unsigned long value;
988 kuid_t uid;
989 int rc;
990
991 rc = get_option_ul(args, &value);
992 if (rc)
993 return rc;
994
995 uid = make_kuid(current_user_ns(), value);
996 if (!uid_valid(uid))
997 return -EINVAL;
998
999 *result = uid;
1000 return 0;
1001 }
1002
1003 static int get_option_gid(substring_t args[], kgid_t *result)
1004 {
1005 unsigned long value;
1006 kgid_t gid;
1007 int rc;
1008
1009 rc = get_option_ul(args, &value);
1010 if (rc)
1011 return rc;
1012
1013 gid = make_kgid(current_user_ns(), value);
1014 if (!gid_valid(gid))
1015 return -EINVAL;
1016
1017 *result = gid;
1018 return 0;
1019 }
1020
1021 static int cifs_parse_security_flavors(char *value,
1022 struct smb_vol *vol)
1023 {
1024
1025 substring_t args[MAX_OPT_ARGS];
1026
1027 switch (match_token(value, cifs_secflavor_tokens, args)) {
1028 case Opt_sec_krb5:
1029 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN;
1030 break;
1031 case Opt_sec_krb5i:
1032 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1033 break;
1034 case Opt_sec_krb5p:
1035 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1036 cifs_dbg(VFS, "Krb5 cifs privacy not supported\n");
1037 break;
1038 case Opt_sec_ntlmssp:
1039 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1040 break;
1041 case Opt_sec_ntlmsspi:
1042 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1043 break;
1044 case Opt_ntlm:
1045 /* ntlm is default so can be turned off too */
1046 vol->secFlg |= CIFSSEC_MAY_NTLM;
1047 break;
1048 case Opt_sec_ntlmi:
1049 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1050 break;
1051 case Opt_sec_ntlmv2:
1052 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1053 break;
1054 case Opt_sec_ntlmv2i:
1055 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1056 break;
1057 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1058 case Opt_sec_lanman:
1059 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1060 break;
1061 #endif
1062 case Opt_sec_none:
1063 vol->nullauth = 1;
1064 break;
1065 default:
1066 cifs_dbg(VFS, "bad security option: %s\n", value);
1067 return 1;
1068 }
1069
1070 return 0;
1071 }
1072
1073 static int
1074 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1075 {
1076 substring_t args[MAX_OPT_ARGS];
1077
1078 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1079 case Opt_cache_loose:
1080 vol->direct_io = false;
1081 vol->strict_io = false;
1082 break;
1083 case Opt_cache_strict:
1084 vol->direct_io = false;
1085 vol->strict_io = true;
1086 break;
1087 case Opt_cache_none:
1088 vol->direct_io = true;
1089 vol->strict_io = false;
1090 break;
1091 default:
1092 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1093 return 1;
1094 }
1095 return 0;
1096 }
1097
1098 static int
1099 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1100 {
1101 substring_t args[MAX_OPT_ARGS];
1102
1103 switch (match_token(value, cifs_smb_version_tokens, args)) {
1104 case Smb_1:
1105 vol->ops = &smb1_operations;
1106 vol->vals = &smb1_values;
1107 break;
1108 #ifdef CONFIG_CIFS_SMB2
1109 case Smb_20:
1110 vol->ops = &smb21_operations; /* currently identical with 2.1 */
1111 vol->vals = &smb20_values;
1112 break;
1113 case Smb_21:
1114 vol->ops = &smb21_operations;
1115 vol->vals = &smb21_values;
1116 break;
1117 case Smb_30:
1118 vol->ops = &smb30_operations;
1119 vol->vals = &smb30_values;
1120 break;
1121 #endif
1122 default:
1123 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1124 return 1;
1125 }
1126 return 0;
1127 }
1128
1129 /*
1130 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1131 * fields with the result. Returns 0 on success and an error otherwise.
1132 */
1133 static int
1134 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1135 {
1136 char *pos;
1137 const char *delims = "/\\";
1138 size_t len;
1139
1140 /* make sure we have a valid UNC double delimiter prefix */
1141 len = strspn(devname, delims);
1142 if (len != 2)
1143 return -EINVAL;
1144
1145 /* find delimiter between host and sharename */
1146 pos = strpbrk(devname + 2, delims);
1147 if (!pos)
1148 return -EINVAL;
1149
1150 /* skip past delimiter */
1151 ++pos;
1152
1153 /* now go until next delimiter or end of string */
1154 len = strcspn(pos, delims);
1155
1156 /* move "pos" up to delimiter or NULL */
1157 pos += len;
1158 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1159 if (!vol->UNC)
1160 return -ENOMEM;
1161
1162 convert_delimiter(vol->UNC, '\\');
1163
1164 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1165 if (!*pos++ || !*pos)
1166 return 0;
1167
1168 vol->prepath = kstrdup(pos, GFP_KERNEL);
1169 if (!vol->prepath)
1170 return -ENOMEM;
1171
1172 return 0;
1173 }
1174
1175 static int
1176 cifs_parse_mount_options(const char *mountdata, const char *devname,
1177 struct smb_vol *vol)
1178 {
1179 char *data, *end;
1180 char *mountdata_copy = NULL, *options;
1181 unsigned int temp_len, i, j;
1182 char separator[2];
1183 short int override_uid = -1;
1184 short int override_gid = -1;
1185 bool uid_specified = false;
1186 bool gid_specified = false;
1187 bool sloppy = false;
1188 char *invalid = NULL;
1189 char *nodename = utsname()->nodename;
1190 char *string = NULL;
1191 char *tmp_end, *value;
1192 char delim;
1193 bool got_ip = false;
1194 unsigned short port = 0;
1195 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1196
1197 separator[0] = ',';
1198 separator[1] = 0;
1199 delim = separator[0];
1200
1201 /* ensure we always start with zeroed-out smb_vol */
1202 memset(vol, 0, sizeof(*vol));
1203
1204 /*
1205 * does not have to be perfect mapping since field is
1206 * informational, only used for servers that do not support
1207 * port 445 and it can be overridden at mount time
1208 */
1209 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1210 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1211 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1212
1213 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1214 /* null target name indicates to use *SMBSERVR default called name
1215 if we end up sending RFC1001 session initialize */
1216 vol->target_rfc1001_name[0] = 0;
1217 vol->cred_uid = current_uid();
1218 vol->linux_uid = current_uid();
1219 vol->linux_gid = current_gid();
1220
1221 /* default to only allowing write access to owner of the mount */
1222 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1223
1224 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1225 /* default is always to request posix paths. */
1226 vol->posix_paths = 1;
1227 /* default to using server inode numbers where available */
1228 vol->server_ino = 1;
1229
1230 /* default is to use strict cifs caching semantics */
1231 vol->strict_io = true;
1232
1233 vol->actimeo = CIFS_DEF_ACTIMEO;
1234
1235 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1236 vol->ops = &smb1_operations;
1237 vol->vals = &smb1_values;
1238
1239 if (!mountdata)
1240 goto cifs_parse_mount_err;
1241
1242 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1243 if (!mountdata_copy)
1244 goto cifs_parse_mount_err;
1245
1246 options = mountdata_copy;
1247 end = options + strlen(options);
1248
1249 if (strncmp(options, "sep=", 4) == 0) {
1250 if (options[4] != 0) {
1251 separator[0] = options[4];
1252 options += 5;
1253 } else {
1254 cifs_dbg(FYI, "Null separator not allowed\n");
1255 }
1256 }
1257 vol->backupuid_specified = false; /* no backup intent for a user */
1258 vol->backupgid_specified = false; /* no backup intent for a group */
1259
1260 /*
1261 * For now, we ignore -EINVAL errors under the assumption that the
1262 * unc= and prefixpath= options will be usable.
1263 */
1264 if (cifs_parse_devname(devname, vol) == -ENOMEM) {
1265 printk(KERN_ERR "CIFS: Unable to allocate memory to parse "
1266 "device string.\n");
1267 goto out_nomem;
1268 }
1269
1270 while ((data = strsep(&options, separator)) != NULL) {
1271 substring_t args[MAX_OPT_ARGS];
1272 unsigned long option;
1273 int token;
1274
1275 if (!*data)
1276 continue;
1277
1278 token = match_token(data, cifs_mount_option_tokens, args);
1279
1280 switch (token) {
1281
1282 /* Ingnore the following */
1283 case Opt_ignore:
1284 break;
1285
1286 /* Boolean values */
1287 case Opt_user_xattr:
1288 vol->no_xattr = 0;
1289 break;
1290 case Opt_nouser_xattr:
1291 vol->no_xattr = 1;
1292 break;
1293 case Opt_forceuid:
1294 override_uid = 1;
1295 break;
1296 case Opt_noforceuid:
1297 override_uid = 0;
1298 break;
1299 case Opt_forcegid:
1300 override_gid = 1;
1301 break;
1302 case Opt_noforcegid:
1303 override_gid = 0;
1304 break;
1305 case Opt_noblocksend:
1306 vol->noblocksnd = 1;
1307 break;
1308 case Opt_noautotune:
1309 vol->noautotune = 1;
1310 break;
1311 case Opt_hard:
1312 vol->retry = 1;
1313 break;
1314 case Opt_soft:
1315 vol->retry = 0;
1316 break;
1317 case Opt_perm:
1318 vol->noperm = 0;
1319 break;
1320 case Opt_noperm:
1321 vol->noperm = 1;
1322 break;
1323 case Opt_mapchars:
1324 vol->remap = 1;
1325 break;
1326 case Opt_nomapchars:
1327 vol->remap = 0;
1328 break;
1329 case Opt_sfu:
1330 vol->sfu_emul = 1;
1331 break;
1332 case Opt_nosfu:
1333 vol->sfu_emul = 0;
1334 break;
1335 case Opt_nodfs:
1336 vol->nodfs = 1;
1337 break;
1338 case Opt_posixpaths:
1339 vol->posix_paths = 1;
1340 break;
1341 case Opt_noposixpaths:
1342 vol->posix_paths = 0;
1343 break;
1344 case Opt_nounix:
1345 vol->no_linux_ext = 1;
1346 break;
1347 case Opt_nocase:
1348 vol->nocase = 1;
1349 break;
1350 case Opt_brl:
1351 vol->nobrl = 0;
1352 break;
1353 case Opt_nobrl:
1354 vol->nobrl = 1;
1355 /*
1356 * turn off mandatory locking in mode
1357 * if remote locking is turned off since the
1358 * local vfs will do advisory
1359 */
1360 if (vol->file_mode ==
1361 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1362 vol->file_mode = S_IALLUGO;
1363 break;
1364 case Opt_forcemandatorylock:
1365 vol->mand_lock = 1;
1366 break;
1367 case Opt_setuids:
1368 vol->setuids = 1;
1369 break;
1370 case Opt_nosetuids:
1371 vol->setuids = 0;
1372 break;
1373 case Opt_dynperm:
1374 vol->dynperm = true;
1375 break;
1376 case Opt_nodynperm:
1377 vol->dynperm = false;
1378 break;
1379 case Opt_nohard:
1380 vol->retry = 0;
1381 break;
1382 case Opt_nosoft:
1383 vol->retry = 1;
1384 break;
1385 case Opt_nointr:
1386 vol->intr = 0;
1387 break;
1388 case Opt_intr:
1389 vol->intr = 1;
1390 break;
1391 case Opt_nostrictsync:
1392 vol->nostrictsync = 1;
1393 break;
1394 case Opt_strictsync:
1395 vol->nostrictsync = 0;
1396 break;
1397 case Opt_serverino:
1398 vol->server_ino = 1;
1399 break;
1400 case Opt_noserverino:
1401 vol->server_ino = 0;
1402 break;
1403 case Opt_rwpidforward:
1404 vol->rwpidforward = 1;
1405 break;
1406 case Opt_cifsacl:
1407 vol->cifs_acl = 1;
1408 break;
1409 case Opt_nocifsacl:
1410 vol->cifs_acl = 0;
1411 break;
1412 case Opt_acl:
1413 vol->no_psx_acl = 0;
1414 break;
1415 case Opt_noacl:
1416 vol->no_psx_acl = 1;
1417 break;
1418 case Opt_locallease:
1419 vol->local_lease = 1;
1420 break;
1421 case Opt_sign:
1422 vol->secFlg |= CIFSSEC_MUST_SIGN;
1423 break;
1424 case Opt_seal:
1425 /* we do not do the following in secFlags because seal
1426 * is a per tree connection (mount) not a per socket
1427 * or per-smb connection option in the protocol
1428 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1429 */
1430 vol->seal = 1;
1431 break;
1432 case Opt_noac:
1433 printk(KERN_WARNING "CIFS: Mount option noac not "
1434 "supported. Instead set "
1435 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1436 break;
1437 case Opt_fsc:
1438 #ifndef CONFIG_CIFS_FSCACHE
1439 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1440 goto cifs_parse_mount_err;
1441 #endif
1442 vol->fsc = true;
1443 break;
1444 case Opt_mfsymlinks:
1445 vol->mfsymlinks = true;
1446 break;
1447 case Opt_multiuser:
1448 vol->multiuser = true;
1449 break;
1450 case Opt_sloppy:
1451 sloppy = true;
1452 break;
1453
1454 /* Numeric Values */
1455 case Opt_backupuid:
1456 if (get_option_uid(args, &vol->backupuid)) {
1457 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1458 __func__);
1459 goto cifs_parse_mount_err;
1460 }
1461 vol->backupuid_specified = true;
1462 break;
1463 case Opt_backupgid:
1464 if (get_option_gid(args, &vol->backupgid)) {
1465 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1466 __func__);
1467 goto cifs_parse_mount_err;
1468 }
1469 vol->backupgid_specified = true;
1470 break;
1471 case Opt_uid:
1472 if (get_option_uid(args, &vol->linux_uid)) {
1473 cifs_dbg(VFS, "%s: Invalid uid value\n",
1474 __func__);
1475 goto cifs_parse_mount_err;
1476 }
1477 uid_specified = true;
1478 break;
1479 case Opt_cruid:
1480 if (get_option_uid(args, &vol->cred_uid)) {
1481 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1482 __func__);
1483 goto cifs_parse_mount_err;
1484 }
1485 break;
1486 case Opt_gid:
1487 if (get_option_gid(args, &vol->linux_gid)) {
1488 cifs_dbg(VFS, "%s: Invalid gid value\n",
1489 __func__);
1490 goto cifs_parse_mount_err;
1491 }
1492 gid_specified = true;
1493 break;
1494 case Opt_file_mode:
1495 if (get_option_ul(args, &option)) {
1496 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1497 __func__);
1498 goto cifs_parse_mount_err;
1499 }
1500 vol->file_mode = option;
1501 break;
1502 case Opt_dirmode:
1503 if (get_option_ul(args, &option)) {
1504 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1505 __func__);
1506 goto cifs_parse_mount_err;
1507 }
1508 vol->dir_mode = option;
1509 break;
1510 case Opt_port:
1511 if (get_option_ul(args, &option) ||
1512 option > USHRT_MAX) {
1513 cifs_dbg(VFS, "%s: Invalid port value\n",
1514 __func__);
1515 goto cifs_parse_mount_err;
1516 }
1517 port = (unsigned short)option;
1518 break;
1519 case Opt_rsize:
1520 if (get_option_ul(args, &option)) {
1521 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1522 __func__);
1523 goto cifs_parse_mount_err;
1524 }
1525 vol->rsize = option;
1526 break;
1527 case Opt_wsize:
1528 if (get_option_ul(args, &option)) {
1529 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1530 __func__);
1531 goto cifs_parse_mount_err;
1532 }
1533 vol->wsize = option;
1534 break;
1535 case Opt_actimeo:
1536 if (get_option_ul(args, &option)) {
1537 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1538 __func__);
1539 goto cifs_parse_mount_err;
1540 }
1541 vol->actimeo = HZ * option;
1542 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1543 cifs_dbg(VFS, "attribute cache timeout too large\n");
1544 goto cifs_parse_mount_err;
1545 }
1546 break;
1547
1548 /* String Arguments */
1549
1550 case Opt_blank_user:
1551 /* null user, ie. anonymous authentication */
1552 vol->nullauth = 1;
1553 vol->username = NULL;
1554 break;
1555 case Opt_user:
1556 string = match_strdup(args);
1557 if (string == NULL)
1558 goto out_nomem;
1559
1560 if (strnlen(string, MAX_USERNAME_SIZE) >
1561 MAX_USERNAME_SIZE) {
1562 printk(KERN_WARNING "CIFS: username too long\n");
1563 goto cifs_parse_mount_err;
1564 }
1565 vol->username = kstrdup(string, GFP_KERNEL);
1566 if (!vol->username)
1567 goto cifs_parse_mount_err;
1568 break;
1569 case Opt_blank_pass:
1570 /* passwords have to be handled differently
1571 * to allow the character used for deliminator
1572 * to be passed within them
1573 */
1574
1575 /*
1576 * Check if this is a case where the password
1577 * starts with a delimiter
1578 */
1579 tmp_end = strchr(data, '=');
1580 tmp_end++;
1581 if (!(tmp_end < end && tmp_end[1] == delim)) {
1582 /* No it is not. Set the password to NULL */
1583 vol->password = NULL;
1584 break;
1585 }
1586 /* Yes it is. Drop down to Opt_pass below.*/
1587 case Opt_pass:
1588 /* Obtain the value string */
1589 value = strchr(data, '=');
1590 value++;
1591
1592 /* Set tmp_end to end of the string */
1593 tmp_end = (char *) value + strlen(value);
1594
1595 /* Check if following character is the deliminator
1596 * If yes, we have encountered a double deliminator
1597 * reset the NULL character to the deliminator
1598 */
1599 if (tmp_end < end && tmp_end[1] == delim) {
1600 tmp_end[0] = delim;
1601
1602 /* Keep iterating until we get to a single
1603 * deliminator OR the end
1604 */
1605 while ((tmp_end = strchr(tmp_end, delim))
1606 != NULL && (tmp_end[1] == delim)) {
1607 tmp_end = (char *) &tmp_end[2];
1608 }
1609
1610 /* Reset var options to point to next element */
1611 if (tmp_end) {
1612 tmp_end[0] = '\0';
1613 options = (char *) &tmp_end[1];
1614 } else
1615 /* Reached the end of the mount option
1616 * string */
1617 options = end;
1618 }
1619
1620 /* Now build new password string */
1621 temp_len = strlen(value);
1622 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1623 if (vol->password == NULL) {
1624 printk(KERN_WARNING "CIFS: no memory "
1625 "for password\n");
1626 goto cifs_parse_mount_err;
1627 }
1628
1629 for (i = 0, j = 0; i < temp_len; i++, j++) {
1630 vol->password[j] = value[i];
1631 if ((value[i] == delim) &&
1632 value[i+1] == delim)
1633 /* skip the second deliminator */
1634 i++;
1635 }
1636 vol->password[j] = '\0';
1637 break;
1638 case Opt_blank_ip:
1639 /* FIXME: should this be an error instead? */
1640 got_ip = false;
1641 break;
1642 case Opt_ip:
1643 string = match_strdup(args);
1644 if (string == NULL)
1645 goto out_nomem;
1646
1647 if (!cifs_convert_address(dstaddr, string,
1648 strlen(string))) {
1649 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1650 string);
1651 goto cifs_parse_mount_err;
1652 }
1653 got_ip = true;
1654 break;
1655 case Opt_domain:
1656 string = match_strdup(args);
1657 if (string == NULL)
1658 goto out_nomem;
1659
1660 if (strnlen(string, 256) == 256) {
1661 printk(KERN_WARNING "CIFS: domain name too"
1662 " long\n");
1663 goto cifs_parse_mount_err;
1664 }
1665
1666 vol->domainname = kstrdup(string, GFP_KERNEL);
1667 if (!vol->domainname) {
1668 printk(KERN_WARNING "CIFS: no memory "
1669 "for domainname\n");
1670 goto cifs_parse_mount_err;
1671 }
1672 cifs_dbg(FYI, "Domain name set\n");
1673 break;
1674 case Opt_srcaddr:
1675 string = match_strdup(args);
1676 if (string == NULL)
1677 goto out_nomem;
1678
1679 if (!cifs_convert_address(
1680 (struct sockaddr *)&vol->srcaddr,
1681 string, strlen(string))) {
1682 printk(KERN_WARNING "CIFS: Could not parse"
1683 " srcaddr: %s\n", string);
1684 goto cifs_parse_mount_err;
1685 }
1686 break;
1687 case Opt_iocharset:
1688 string = match_strdup(args);
1689 if (string == NULL)
1690 goto out_nomem;
1691
1692 if (strnlen(string, 1024) >= 65) {
1693 printk(KERN_WARNING "CIFS: iocharset name "
1694 "too long.\n");
1695 goto cifs_parse_mount_err;
1696 }
1697
1698 if (strnicmp(string, "default", 7) != 0) {
1699 vol->iocharset = kstrdup(string,
1700 GFP_KERNEL);
1701 if (!vol->iocharset) {
1702 printk(KERN_WARNING "CIFS: no memory"
1703 "for charset\n");
1704 goto cifs_parse_mount_err;
1705 }
1706 }
1707 /* if iocharset not set then load_nls_default
1708 * is used by caller
1709 */
1710 cifs_dbg(FYI, "iocharset set to %s\n", string);
1711 break;
1712 case Opt_netbiosname:
1713 string = match_strdup(args);
1714 if (string == NULL)
1715 goto out_nomem;
1716
1717 memset(vol->source_rfc1001_name, 0x20,
1718 RFC1001_NAME_LEN);
1719 /*
1720 * FIXME: are there cases in which a comma can
1721 * be valid in workstation netbios name (and
1722 * need special handling)?
1723 */
1724 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1725 /* don't ucase netbiosname for user */
1726 if (string[i] == 0)
1727 break;
1728 vol->source_rfc1001_name[i] = string[i];
1729 }
1730 /* The string has 16th byte zero still from
1731 * set at top of the function
1732 */
1733 if (i == RFC1001_NAME_LEN && string[i] != 0)
1734 printk(KERN_WARNING "CIFS: netbiosname"
1735 " longer than 15 truncated.\n");
1736
1737 break;
1738 case Opt_servern:
1739 /* servernetbiosname specified override *SMBSERVER */
1740 string = match_strdup(args);
1741 if (string == NULL)
1742 goto out_nomem;
1743
1744 /* last byte, type, is 0x20 for servr type */
1745 memset(vol->target_rfc1001_name, 0x20,
1746 RFC1001_NAME_LEN_WITH_NULL);
1747
1748 /* BB are there cases in which a comma can be
1749 valid in this workstation netbios name
1750 (and need special handling)? */
1751
1752 /* user or mount helper must uppercase the
1753 netbios name */
1754 for (i = 0; i < 15; i++) {
1755 if (string[i] == 0)
1756 break;
1757 vol->target_rfc1001_name[i] = string[i];
1758 }
1759 /* The string has 16th byte zero still from
1760 set at top of the function */
1761 if (i == RFC1001_NAME_LEN && string[i] != 0)
1762 printk(KERN_WARNING "CIFS: server net"
1763 "biosname longer than 15 truncated.\n");
1764 break;
1765 case Opt_ver:
1766 string = match_strdup(args);
1767 if (string == NULL)
1768 goto out_nomem;
1769
1770 if (strnicmp(string, "1", 1) == 0) {
1771 /* This is the default */
1772 break;
1773 }
1774 /* For all other value, error */
1775 printk(KERN_WARNING "CIFS: Invalid version"
1776 " specified\n");
1777 goto cifs_parse_mount_err;
1778 case Opt_vers:
1779 string = match_strdup(args);
1780 if (string == NULL)
1781 goto out_nomem;
1782
1783 if (cifs_parse_smb_version(string, vol) != 0)
1784 goto cifs_parse_mount_err;
1785 break;
1786 case Opt_sec:
1787 string = match_strdup(args);
1788 if (string == NULL)
1789 goto out_nomem;
1790
1791 if (cifs_parse_security_flavors(string, vol) != 0)
1792 goto cifs_parse_mount_err;
1793 break;
1794 case Opt_cache:
1795 string = match_strdup(args);
1796 if (string == NULL)
1797 goto out_nomem;
1798
1799 if (cifs_parse_cache_flavor(string, vol) != 0)
1800 goto cifs_parse_mount_err;
1801 break;
1802 default:
1803 /*
1804 * An option we don't recognize. Save it off for later
1805 * if we haven't already found one
1806 */
1807 if (!invalid)
1808 invalid = data;
1809 break;
1810 }
1811 /* Free up any allocated string */
1812 kfree(string);
1813 string = NULL;
1814 }
1815
1816 if (!sloppy && invalid) {
1817 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1818 goto cifs_parse_mount_err;
1819 }
1820
1821 #ifndef CONFIG_KEYS
1822 /* Muliuser mounts require CONFIG_KEYS support */
1823 if (vol->multiuser) {
1824 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1825 goto cifs_parse_mount_err;
1826 }
1827 #endif
1828 if (!vol->UNC) {
1829 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string or in unc= option!\n");
1830 goto cifs_parse_mount_err;
1831 }
1832
1833 /* make sure UNC has a share name */
1834 if (!strchr(vol->UNC + 3, '\\')) {
1835 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1836 goto cifs_parse_mount_err;
1837 }
1838
1839 if (!got_ip) {
1840 /* No ip= option specified? Try to get it from UNC */
1841 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1842 strlen(&vol->UNC[2]))) {
1843 printk(KERN_ERR "Unable to determine destination "
1844 "address.\n");
1845 goto cifs_parse_mount_err;
1846 }
1847 }
1848
1849 /* set the port that we got earlier */
1850 cifs_set_port(dstaddr, port);
1851
1852 if (uid_specified)
1853 vol->override_uid = override_uid;
1854 else if (override_uid == 1)
1855 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1856 "specified with no uid= option.\n");
1857
1858 if (gid_specified)
1859 vol->override_gid = override_gid;
1860 else if (override_gid == 1)
1861 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1862 "specified with no gid= option.\n");
1863
1864 kfree(mountdata_copy);
1865 return 0;
1866
1867 out_nomem:
1868 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1869 cifs_parse_mount_err:
1870 kfree(string);
1871 kfree(mountdata_copy);
1872 return 1;
1873 }
1874
1875 /** Returns true if srcaddr isn't specified and rhs isn't
1876 * specified, or if srcaddr is specified and
1877 * matches the IP address of the rhs argument.
1878 */
1879 static bool
1880 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1881 {
1882 switch (srcaddr->sa_family) {
1883 case AF_UNSPEC:
1884 return (rhs->sa_family == AF_UNSPEC);
1885 case AF_INET: {
1886 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1887 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1888 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1889 }
1890 case AF_INET6: {
1891 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1892 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1893 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1894 }
1895 default:
1896 WARN_ON(1);
1897 return false; /* don't expect to be here */
1898 }
1899 }
1900
1901 /*
1902 * If no port is specified in addr structure, we try to match with 445 port
1903 * and if it fails - with 139 ports. It should be called only if address
1904 * families of server and addr are equal.
1905 */
1906 static bool
1907 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1908 {
1909 __be16 port, *sport;
1910
1911 switch (addr->sa_family) {
1912 case AF_INET:
1913 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1914 port = ((struct sockaddr_in *) addr)->sin_port;
1915 break;
1916 case AF_INET6:
1917 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1918 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1919 break;
1920 default:
1921 WARN_ON(1);
1922 return false;
1923 }
1924
1925 if (!port) {
1926 port = htons(CIFS_PORT);
1927 if (port == *sport)
1928 return true;
1929
1930 port = htons(RFC1001_PORT);
1931 }
1932
1933 return port == *sport;
1934 }
1935
1936 static bool
1937 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1938 struct sockaddr *srcaddr)
1939 {
1940 switch (addr->sa_family) {
1941 case AF_INET: {
1942 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1943 struct sockaddr_in *srv_addr4 =
1944 (struct sockaddr_in *)&server->dstaddr;
1945
1946 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1947 return false;
1948 break;
1949 }
1950 case AF_INET6: {
1951 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1952 struct sockaddr_in6 *srv_addr6 =
1953 (struct sockaddr_in6 *)&server->dstaddr;
1954
1955 if (!ipv6_addr_equal(&addr6->sin6_addr,
1956 &srv_addr6->sin6_addr))
1957 return false;
1958 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1959 return false;
1960 break;
1961 }
1962 default:
1963 WARN_ON(1);
1964 return false; /* don't expect to be here */
1965 }
1966
1967 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1968 return false;
1969
1970 return true;
1971 }
1972
1973 static bool
1974 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1975 {
1976 unsigned int secFlags;
1977
1978 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1979 secFlags = vol->secFlg;
1980 else
1981 secFlags = global_secflags | vol->secFlg;
1982
1983 switch (server->secType) {
1984 case LANMAN:
1985 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1986 return false;
1987 break;
1988 case NTLMv2:
1989 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1990 return false;
1991 break;
1992 case NTLM:
1993 if (!(secFlags & CIFSSEC_MAY_NTLM))
1994 return false;
1995 break;
1996 case Kerberos:
1997 if (!(secFlags & CIFSSEC_MAY_KRB5))
1998 return false;
1999 break;
2000 case RawNTLMSSP:
2001 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2002 return false;
2003 break;
2004 default:
2005 /* shouldn't happen */
2006 return false;
2007 }
2008
2009 /* now check if signing mode is acceptable */
2010 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2011 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2012 return false;
2013 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2014 (server->sec_mode &
2015 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2016 return false;
2017
2018 return true;
2019 }
2020
2021 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2022 {
2023 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2024
2025 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2026 return 0;
2027
2028 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2029 return 0;
2030
2031 if (!match_address(server, addr,
2032 (struct sockaddr *)&vol->srcaddr))
2033 return 0;
2034
2035 if (!match_port(server, addr))
2036 return 0;
2037
2038 if (!match_security(server, vol))
2039 return 0;
2040
2041 return 1;
2042 }
2043
2044 static struct TCP_Server_Info *
2045 cifs_find_tcp_session(struct smb_vol *vol)
2046 {
2047 struct TCP_Server_Info *server;
2048
2049 spin_lock(&cifs_tcp_ses_lock);
2050 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2051 if (!match_server(server, vol))
2052 continue;
2053
2054 ++server->srv_count;
2055 spin_unlock(&cifs_tcp_ses_lock);
2056 cifs_dbg(FYI, "Existing tcp session with server found\n");
2057 return server;
2058 }
2059 spin_unlock(&cifs_tcp_ses_lock);
2060 return NULL;
2061 }
2062
2063 static void
2064 cifs_put_tcp_session(struct TCP_Server_Info *server)
2065 {
2066 struct task_struct *task;
2067
2068 spin_lock(&cifs_tcp_ses_lock);
2069 if (--server->srv_count > 0) {
2070 spin_unlock(&cifs_tcp_ses_lock);
2071 return;
2072 }
2073
2074 put_net(cifs_net_ns(server));
2075
2076 list_del_init(&server->tcp_ses_list);
2077 spin_unlock(&cifs_tcp_ses_lock);
2078
2079 cancel_delayed_work_sync(&server->echo);
2080
2081 spin_lock(&GlobalMid_Lock);
2082 server->tcpStatus = CifsExiting;
2083 spin_unlock(&GlobalMid_Lock);
2084
2085 cifs_crypto_shash_release(server);
2086 cifs_fscache_release_client_cookie(server);
2087
2088 kfree(server->session_key.response);
2089 server->session_key.response = NULL;
2090 server->session_key.len = 0;
2091
2092 task = xchg(&server->tsk, NULL);
2093 if (task)
2094 force_sig(SIGKILL, task);
2095 }
2096
2097 static struct TCP_Server_Info *
2098 cifs_get_tcp_session(struct smb_vol *volume_info)
2099 {
2100 struct TCP_Server_Info *tcp_ses = NULL;
2101 int rc;
2102
2103 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2104
2105 /* see if we already have a matching tcp_ses */
2106 tcp_ses = cifs_find_tcp_session(volume_info);
2107 if (tcp_ses)
2108 return tcp_ses;
2109
2110 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2111 if (!tcp_ses) {
2112 rc = -ENOMEM;
2113 goto out_err;
2114 }
2115
2116 rc = cifs_crypto_shash_allocate(tcp_ses);
2117 if (rc) {
2118 cifs_dbg(VFS, "could not setup hash structures rc %d\n", rc);
2119 goto out_err;
2120 }
2121
2122 tcp_ses->ops = volume_info->ops;
2123 tcp_ses->vals = volume_info->vals;
2124 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2125 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2126 if (IS_ERR(tcp_ses->hostname)) {
2127 rc = PTR_ERR(tcp_ses->hostname);
2128 goto out_err_crypto_release;
2129 }
2130
2131 tcp_ses->noblocksnd = volume_info->noblocksnd;
2132 tcp_ses->noautotune = volume_info->noautotune;
2133 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2134 tcp_ses->in_flight = 0;
2135 tcp_ses->credits = 1;
2136 init_waitqueue_head(&tcp_ses->response_q);
2137 init_waitqueue_head(&tcp_ses->request_q);
2138 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2139 mutex_init(&tcp_ses->srv_mutex);
2140 memcpy(tcp_ses->workstation_RFC1001_name,
2141 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2142 memcpy(tcp_ses->server_RFC1001_name,
2143 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2144 tcp_ses->session_estab = false;
2145 tcp_ses->sequence_number = 0;
2146 tcp_ses->lstrp = jiffies;
2147 spin_lock_init(&tcp_ses->req_lock);
2148 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2149 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2150 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2151 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2152 sizeof(tcp_ses->srcaddr));
2153 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2154 sizeof(tcp_ses->dstaddr));
2155 /*
2156 * at this point we are the only ones with the pointer
2157 * to the struct since the kernel thread not created yet
2158 * no need to spinlock this init of tcpStatus or srv_count
2159 */
2160 tcp_ses->tcpStatus = CifsNew;
2161 ++tcp_ses->srv_count;
2162
2163 rc = ip_connect(tcp_ses);
2164 if (rc < 0) {
2165 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2166 goto out_err_crypto_release;
2167 }
2168
2169 /*
2170 * since we're in a cifs function already, we know that
2171 * this will succeed. No need for try_module_get().
2172 */
2173 __module_get(THIS_MODULE);
2174 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2175 tcp_ses, "cifsd");
2176 if (IS_ERR(tcp_ses->tsk)) {
2177 rc = PTR_ERR(tcp_ses->tsk);
2178 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2179 module_put(THIS_MODULE);
2180 goto out_err_crypto_release;
2181 }
2182 tcp_ses->tcpStatus = CifsNeedNegotiate;
2183
2184 /* thread spawned, put it on the list */
2185 spin_lock(&cifs_tcp_ses_lock);
2186 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2187 spin_unlock(&cifs_tcp_ses_lock);
2188
2189 cifs_fscache_get_client_cookie(tcp_ses);
2190
2191 /* queue echo request delayed work */
2192 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2193
2194 return tcp_ses;
2195
2196 out_err_crypto_release:
2197 cifs_crypto_shash_release(tcp_ses);
2198
2199 put_net(cifs_net_ns(tcp_ses));
2200
2201 out_err:
2202 if (tcp_ses) {
2203 if (!IS_ERR(tcp_ses->hostname))
2204 kfree(tcp_ses->hostname);
2205 if (tcp_ses->ssocket)
2206 sock_release(tcp_ses->ssocket);
2207 kfree(tcp_ses);
2208 }
2209 return ERR_PTR(rc);
2210 }
2211
2212 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2213 {
2214 switch (ses->server->secType) {
2215 case Kerberos:
2216 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2217 return 0;
2218 break;
2219 default:
2220 /* NULL username means anonymous session */
2221 if (ses->user_name == NULL) {
2222 if (!vol->nullauth)
2223 return 0;
2224 break;
2225 }
2226
2227 /* anything else takes username/password */
2228 if (strncmp(ses->user_name,
2229 vol->username ? vol->username : "",
2230 MAX_USERNAME_SIZE))
2231 return 0;
2232 if (strlen(vol->username) != 0 &&
2233 ses->password != NULL &&
2234 strncmp(ses->password,
2235 vol->password ? vol->password : "",
2236 MAX_PASSWORD_SIZE))
2237 return 0;
2238 }
2239 return 1;
2240 }
2241
2242 static struct cifs_ses *
2243 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2244 {
2245 struct cifs_ses *ses;
2246
2247 spin_lock(&cifs_tcp_ses_lock);
2248 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2249 if (!match_session(ses, vol))
2250 continue;
2251 ++ses->ses_count;
2252 spin_unlock(&cifs_tcp_ses_lock);
2253 return ses;
2254 }
2255 spin_unlock(&cifs_tcp_ses_lock);
2256 return NULL;
2257 }
2258
2259 static void
2260 cifs_put_smb_ses(struct cifs_ses *ses)
2261 {
2262 unsigned int xid;
2263 struct TCP_Server_Info *server = ses->server;
2264
2265 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2266 spin_lock(&cifs_tcp_ses_lock);
2267 if (--ses->ses_count > 0) {
2268 spin_unlock(&cifs_tcp_ses_lock);
2269 return;
2270 }
2271
2272 list_del_init(&ses->smb_ses_list);
2273 spin_unlock(&cifs_tcp_ses_lock);
2274
2275 if (ses->status == CifsGood && server->ops->logoff) {
2276 xid = get_xid();
2277 server->ops->logoff(xid, ses);
2278 _free_xid(xid);
2279 }
2280 sesInfoFree(ses);
2281 cifs_put_tcp_session(server);
2282 }
2283
2284 #ifdef CONFIG_KEYS
2285
2286 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2287 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2288
2289 /* Populate username and pw fields from keyring if possible */
2290 static int
2291 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2292 {
2293 int rc = 0;
2294 char *desc, *delim, *payload;
2295 ssize_t len;
2296 struct key *key;
2297 struct TCP_Server_Info *server = ses->server;
2298 struct sockaddr_in *sa;
2299 struct sockaddr_in6 *sa6;
2300 struct user_key_payload *upayload;
2301
2302 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2303 if (!desc)
2304 return -ENOMEM;
2305
2306 /* try to find an address key first */
2307 switch (server->dstaddr.ss_family) {
2308 case AF_INET:
2309 sa = (struct sockaddr_in *)&server->dstaddr;
2310 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2311 break;
2312 case AF_INET6:
2313 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2314 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2315 break;
2316 default:
2317 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2318 server->dstaddr.ss_family);
2319 rc = -EINVAL;
2320 goto out_err;
2321 }
2322
2323 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2324 key = request_key(&key_type_logon, desc, "");
2325 if (IS_ERR(key)) {
2326 if (!ses->domainName) {
2327 cifs_dbg(FYI, "domainName is NULL\n");
2328 rc = PTR_ERR(key);
2329 goto out_err;
2330 }
2331
2332 /* didn't work, try to find a domain key */
2333 sprintf(desc, "cifs:d:%s", ses->domainName);
2334 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2335 key = request_key(&key_type_logon, desc, "");
2336 if (IS_ERR(key)) {
2337 rc = PTR_ERR(key);
2338 goto out_err;
2339 }
2340 }
2341
2342 down_read(&key->sem);
2343 upayload = key->payload.data;
2344 if (IS_ERR_OR_NULL(upayload)) {
2345 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2346 goto out_key_put;
2347 }
2348
2349 /* find first : in payload */
2350 payload = (char *)upayload->data;
2351 delim = strnchr(payload, upayload->datalen, ':');
2352 cifs_dbg(FYI, "payload=%s\n", payload);
2353 if (!delim) {
2354 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2355 upayload->datalen);
2356 rc = -EINVAL;
2357 goto out_key_put;
2358 }
2359
2360 len = delim - payload;
2361 if (len > MAX_USERNAME_SIZE || len <= 0) {
2362 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2363 len);
2364 rc = -EINVAL;
2365 goto out_key_put;
2366 }
2367
2368 vol->username = kstrndup(payload, len, GFP_KERNEL);
2369 if (!vol->username) {
2370 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2371 len);
2372 rc = -ENOMEM;
2373 goto out_key_put;
2374 }
2375 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2376
2377 len = key->datalen - (len + 1);
2378 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2379 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2380 rc = -EINVAL;
2381 kfree(vol->username);
2382 vol->username = NULL;
2383 goto out_key_put;
2384 }
2385
2386 ++delim;
2387 vol->password = kstrndup(delim, len, GFP_KERNEL);
2388 if (!vol->password) {
2389 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2390 len);
2391 rc = -ENOMEM;
2392 kfree(vol->username);
2393 vol->username = NULL;
2394 goto out_key_put;
2395 }
2396
2397 out_key_put:
2398 up_read(&key->sem);
2399 key_put(key);
2400 out_err:
2401 kfree(desc);
2402 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2403 return rc;
2404 }
2405 #else /* ! CONFIG_KEYS */
2406 static inline int
2407 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2408 struct cifs_ses *ses __attribute__((unused)))
2409 {
2410 return -ENOSYS;
2411 }
2412 #endif /* CONFIG_KEYS */
2413
2414 static struct cifs_ses *
2415 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2416 {
2417 int rc = -ENOMEM;
2418 unsigned int xid;
2419 struct cifs_ses *ses;
2420 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2421 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2422
2423 xid = get_xid();
2424
2425 ses = cifs_find_smb_ses(server, volume_info);
2426 if (ses) {
2427 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2428 ses->status);
2429
2430 mutex_lock(&ses->session_mutex);
2431 rc = cifs_negotiate_protocol(xid, ses);
2432 if (rc) {
2433 mutex_unlock(&ses->session_mutex);
2434 /* problem -- put our ses reference */
2435 cifs_put_smb_ses(ses);
2436 free_xid(xid);
2437 return ERR_PTR(rc);
2438 }
2439 if (ses->need_reconnect) {
2440 cifs_dbg(FYI, "Session needs reconnect\n");
2441 rc = cifs_setup_session(xid, ses,
2442 volume_info->local_nls);
2443 if (rc) {
2444 mutex_unlock(&ses->session_mutex);
2445 /* problem -- put our reference */
2446 cifs_put_smb_ses(ses);
2447 free_xid(xid);
2448 return ERR_PTR(rc);
2449 }
2450 }
2451 mutex_unlock(&ses->session_mutex);
2452
2453 /* existing SMB ses has a server reference already */
2454 cifs_put_tcp_session(server);
2455 free_xid(xid);
2456 return ses;
2457 }
2458
2459 cifs_dbg(FYI, "Existing smb sess not found\n");
2460 ses = sesInfoAlloc();
2461 if (ses == NULL)
2462 goto get_ses_fail;
2463
2464 /* new SMB session uses our server ref */
2465 ses->server = server;
2466 if (server->dstaddr.ss_family == AF_INET6)
2467 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2468 else
2469 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2470
2471 if (volume_info->username) {
2472 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2473 if (!ses->user_name)
2474 goto get_ses_fail;
2475 }
2476
2477 /* volume_info->password freed at unmount */
2478 if (volume_info->password) {
2479 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2480 if (!ses->password)
2481 goto get_ses_fail;
2482 }
2483 if (volume_info->domainname) {
2484 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2485 if (!ses->domainName)
2486 goto get_ses_fail;
2487 }
2488 ses->cred_uid = volume_info->cred_uid;
2489 ses->linux_uid = volume_info->linux_uid;
2490
2491 ses->overrideSecFlg = volume_info->secFlg;
2492
2493 mutex_lock(&ses->session_mutex);
2494 rc = cifs_negotiate_protocol(xid, ses);
2495 if (!rc)
2496 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2497 mutex_unlock(&ses->session_mutex);
2498 if (rc)
2499 goto get_ses_fail;
2500
2501 /* success, put it on the list */
2502 spin_lock(&cifs_tcp_ses_lock);
2503 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2504 spin_unlock(&cifs_tcp_ses_lock);
2505
2506 free_xid(xid);
2507 return ses;
2508
2509 get_ses_fail:
2510 sesInfoFree(ses);
2511 free_xid(xid);
2512 return ERR_PTR(rc);
2513 }
2514
2515 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2516 {
2517 if (tcon->tidStatus == CifsExiting)
2518 return 0;
2519 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2520 return 0;
2521 return 1;
2522 }
2523
2524 static struct cifs_tcon *
2525 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2526 {
2527 struct list_head *tmp;
2528 struct cifs_tcon *tcon;
2529
2530 spin_lock(&cifs_tcp_ses_lock);
2531 list_for_each(tmp, &ses->tcon_list) {
2532 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2533 if (!match_tcon(tcon, unc))
2534 continue;
2535 ++tcon->tc_count;
2536 spin_unlock(&cifs_tcp_ses_lock);
2537 return tcon;
2538 }
2539 spin_unlock(&cifs_tcp_ses_lock);
2540 return NULL;
2541 }
2542
2543 static void
2544 cifs_put_tcon(struct cifs_tcon *tcon)
2545 {
2546 unsigned int xid;
2547 struct cifs_ses *ses = tcon->ses;
2548
2549 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2550 spin_lock(&cifs_tcp_ses_lock);
2551 if (--tcon->tc_count > 0) {
2552 spin_unlock(&cifs_tcp_ses_lock);
2553 return;
2554 }
2555
2556 list_del_init(&tcon->tcon_list);
2557 spin_unlock(&cifs_tcp_ses_lock);
2558
2559 xid = get_xid();
2560 if (ses->server->ops->tree_disconnect)
2561 ses->server->ops->tree_disconnect(xid, tcon);
2562 _free_xid(xid);
2563
2564 cifs_fscache_release_super_cookie(tcon);
2565 tconInfoFree(tcon);
2566 cifs_put_smb_ses(ses);
2567 }
2568
2569 static struct cifs_tcon *
2570 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2571 {
2572 int rc, xid;
2573 struct cifs_tcon *tcon;
2574
2575 tcon = cifs_find_tcon(ses, volume_info->UNC);
2576 if (tcon) {
2577 cifs_dbg(FYI, "Found match on UNC path\n");
2578 /* existing tcon already has a reference */
2579 cifs_put_smb_ses(ses);
2580 if (tcon->seal != volume_info->seal)
2581 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2582 return tcon;
2583 }
2584
2585 if (!ses->server->ops->tree_connect) {
2586 rc = -ENOSYS;
2587 goto out_fail;
2588 }
2589
2590 tcon = tconInfoAlloc();
2591 if (tcon == NULL) {
2592 rc = -ENOMEM;
2593 goto out_fail;
2594 }
2595
2596 tcon->ses = ses;
2597 if (volume_info->password) {
2598 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2599 if (!tcon->password) {
2600 rc = -ENOMEM;
2601 goto out_fail;
2602 }
2603 }
2604
2605 /*
2606 * BB Do we need to wrap session_mutex around this TCon call and Unix
2607 * SetFS as we do on SessSetup and reconnect?
2608 */
2609 xid = get_xid();
2610 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2611 volume_info->local_nls);
2612 free_xid(xid);
2613 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2614 if (rc)
2615 goto out_fail;
2616
2617 if (volume_info->nodfs) {
2618 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2619 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2620 }
2621 tcon->seal = volume_info->seal;
2622 /*
2623 * We can have only one retry value for a connection to a share so for
2624 * resources mounted more than once to the same server share the last
2625 * value passed in for the retry flag is used.
2626 */
2627 tcon->retry = volume_info->retry;
2628 tcon->nocase = volume_info->nocase;
2629 tcon->local_lease = volume_info->local_lease;
2630 INIT_LIST_HEAD(&tcon->pending_opens);
2631
2632 spin_lock(&cifs_tcp_ses_lock);
2633 list_add(&tcon->tcon_list, &ses->tcon_list);
2634 spin_unlock(&cifs_tcp_ses_lock);
2635
2636 cifs_fscache_get_super_cookie(tcon);
2637
2638 return tcon;
2639
2640 out_fail:
2641 tconInfoFree(tcon);
2642 return ERR_PTR(rc);
2643 }
2644
2645 void
2646 cifs_put_tlink(struct tcon_link *tlink)
2647 {
2648 if (!tlink || IS_ERR(tlink))
2649 return;
2650
2651 if (!atomic_dec_and_test(&tlink->tl_count) ||
2652 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2653 tlink->tl_time = jiffies;
2654 return;
2655 }
2656
2657 if (!IS_ERR(tlink_tcon(tlink)))
2658 cifs_put_tcon(tlink_tcon(tlink));
2659 kfree(tlink);
2660 return;
2661 }
2662
2663 static inline struct tcon_link *
2664 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2665 {
2666 return cifs_sb->master_tlink;
2667 }
2668
2669 static int
2670 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2671 {
2672 struct cifs_sb_info *old = CIFS_SB(sb);
2673 struct cifs_sb_info *new = mnt_data->cifs_sb;
2674
2675 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2676 return 0;
2677
2678 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2679 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2680 return 0;
2681
2682 /*
2683 * We want to share sb only if we don't specify an r/wsize or
2684 * specified r/wsize is greater than or equal to existing one.
2685 */
2686 if (new->wsize && new->wsize < old->wsize)
2687 return 0;
2688
2689 if (new->rsize && new->rsize < old->rsize)
2690 return 0;
2691
2692 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2693 return 0;
2694
2695 if (old->mnt_file_mode != new->mnt_file_mode ||
2696 old->mnt_dir_mode != new->mnt_dir_mode)
2697 return 0;
2698
2699 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2700 return 0;
2701
2702 if (old->actimeo != new->actimeo)
2703 return 0;
2704
2705 return 1;
2706 }
2707
2708 int
2709 cifs_match_super(struct super_block *sb, void *data)
2710 {
2711 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2712 struct smb_vol *volume_info;
2713 struct cifs_sb_info *cifs_sb;
2714 struct TCP_Server_Info *tcp_srv;
2715 struct cifs_ses *ses;
2716 struct cifs_tcon *tcon;
2717 struct tcon_link *tlink;
2718 int rc = 0;
2719
2720 spin_lock(&cifs_tcp_ses_lock);
2721 cifs_sb = CIFS_SB(sb);
2722 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2723 if (IS_ERR(tlink)) {
2724 spin_unlock(&cifs_tcp_ses_lock);
2725 return rc;
2726 }
2727 tcon = tlink_tcon(tlink);
2728 ses = tcon->ses;
2729 tcp_srv = ses->server;
2730
2731 volume_info = mnt_data->vol;
2732
2733 if (!match_server(tcp_srv, volume_info) ||
2734 !match_session(ses, volume_info) ||
2735 !match_tcon(tcon, volume_info->UNC)) {
2736 rc = 0;
2737 goto out;
2738 }
2739
2740 rc = compare_mount_options(sb, mnt_data);
2741 out:
2742 spin_unlock(&cifs_tcp_ses_lock);
2743 cifs_put_tlink(tlink);
2744 return rc;
2745 }
2746
2747 int
2748 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2749 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2750 struct dfs_info3_param **referrals, int remap)
2751 {
2752 char *temp_unc;
2753 int rc = 0;
2754
2755 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2756 return -ENOSYS;
2757
2758 *num_referrals = 0;
2759 *referrals = NULL;
2760
2761 if (ses->ipc_tid == 0) {
2762 temp_unc = kmalloc(2 /* for slashes */ +
2763 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2764 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2765 if (temp_unc == NULL)
2766 return -ENOMEM;
2767 temp_unc[0] = '\\';
2768 temp_unc[1] = '\\';
2769 strcpy(temp_unc + 2, ses->serverName);
2770 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2771 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2772 nls_codepage);
2773 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2774 kfree(temp_unc);
2775 }
2776 if (rc == 0)
2777 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2778 referrals, num_referrals,
2779 nls_codepage, remap);
2780 /*
2781 * BB - map targetUNCs to dfs_info3 structures, here or in
2782 * ses->server->ops->get_dfs_refer.
2783 */
2784
2785 return rc;
2786 }
2787
2788 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2789 static struct lock_class_key cifs_key[2];
2790 static struct lock_class_key cifs_slock_key[2];
2791
2792 static inline void
2793 cifs_reclassify_socket4(struct socket *sock)
2794 {
2795 struct sock *sk = sock->sk;
2796 BUG_ON(sock_owned_by_user(sk));
2797 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2798 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2799 }
2800
2801 static inline void
2802 cifs_reclassify_socket6(struct socket *sock)
2803 {
2804 struct sock *sk = sock->sk;
2805 BUG_ON(sock_owned_by_user(sk));
2806 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2807 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2808 }
2809 #else
2810 static inline void
2811 cifs_reclassify_socket4(struct socket *sock)
2812 {
2813 }
2814
2815 static inline void
2816 cifs_reclassify_socket6(struct socket *sock)
2817 {
2818 }
2819 #endif
2820
2821 /* See RFC1001 section 14 on representation of Netbios names */
2822 static void rfc1002mangle(char *target, char *source, unsigned int length)
2823 {
2824 unsigned int i, j;
2825
2826 for (i = 0, j = 0; i < (length); i++) {
2827 /* mask a nibble at a time and encode */
2828 target[j] = 'A' + (0x0F & (source[i] >> 4));
2829 target[j+1] = 'A' + (0x0F & source[i]);
2830 j += 2;
2831 }
2832
2833 }
2834
2835 static int
2836 bind_socket(struct TCP_Server_Info *server)
2837 {
2838 int rc = 0;
2839 if (server->srcaddr.ss_family != AF_UNSPEC) {
2840 /* Bind to the specified local IP address */
2841 struct socket *socket = server->ssocket;
2842 rc = socket->ops->bind(socket,
2843 (struct sockaddr *) &server->srcaddr,
2844 sizeof(server->srcaddr));
2845 if (rc < 0) {
2846 struct sockaddr_in *saddr4;
2847 struct sockaddr_in6 *saddr6;
2848 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2849 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2850 if (saddr6->sin6_family == AF_INET6)
2851 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2852 &saddr6->sin6_addr, rc);
2853 else
2854 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2855 &saddr4->sin_addr.s_addr, rc);
2856 }
2857 }
2858 return rc;
2859 }
2860
2861 static int
2862 ip_rfc1001_connect(struct TCP_Server_Info *server)
2863 {
2864 int rc = 0;
2865 /*
2866 * some servers require RFC1001 sessinit before sending
2867 * negprot - BB check reconnection in case where second
2868 * sessinit is sent but no second negprot
2869 */
2870 struct rfc1002_session_packet *ses_init_buf;
2871 struct smb_hdr *smb_buf;
2872 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2873 GFP_KERNEL);
2874 if (ses_init_buf) {
2875 ses_init_buf->trailer.session_req.called_len = 32;
2876
2877 if (server->server_RFC1001_name &&
2878 server->server_RFC1001_name[0] != 0)
2879 rfc1002mangle(ses_init_buf->trailer.
2880 session_req.called_name,
2881 server->server_RFC1001_name,
2882 RFC1001_NAME_LEN_WITH_NULL);
2883 else
2884 rfc1002mangle(ses_init_buf->trailer.
2885 session_req.called_name,
2886 DEFAULT_CIFS_CALLED_NAME,
2887 RFC1001_NAME_LEN_WITH_NULL);
2888
2889 ses_init_buf->trailer.session_req.calling_len = 32;
2890
2891 /*
2892 * calling name ends in null (byte 16) from old smb
2893 * convention.
2894 */
2895 if (server->workstation_RFC1001_name &&
2896 server->workstation_RFC1001_name[0] != 0)
2897 rfc1002mangle(ses_init_buf->trailer.
2898 session_req.calling_name,
2899 server->workstation_RFC1001_name,
2900 RFC1001_NAME_LEN_WITH_NULL);
2901 else
2902 rfc1002mangle(ses_init_buf->trailer.
2903 session_req.calling_name,
2904 "LINUX_CIFS_CLNT",
2905 RFC1001_NAME_LEN_WITH_NULL);
2906
2907 ses_init_buf->trailer.session_req.scope1 = 0;
2908 ses_init_buf->trailer.session_req.scope2 = 0;
2909 smb_buf = (struct smb_hdr *)ses_init_buf;
2910
2911 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2912 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2913 rc = smb_send(server, smb_buf, 0x44);
2914 kfree(ses_init_buf);
2915 /*
2916 * RFC1001 layer in at least one server
2917 * requires very short break before negprot
2918 * presumably because not expecting negprot
2919 * to follow so fast. This is a simple
2920 * solution that works without
2921 * complicating the code and causes no
2922 * significant slowing down on mount
2923 * for everyone else
2924 */
2925 usleep_range(1000, 2000);
2926 }
2927 /*
2928 * else the negprot may still work without this
2929 * even though malloc failed
2930 */
2931
2932 return rc;
2933 }
2934
2935 static int
2936 generic_ip_connect(struct TCP_Server_Info *server)
2937 {
2938 int rc = 0;
2939 __be16 sport;
2940 int slen, sfamily;
2941 struct socket *socket = server->ssocket;
2942 struct sockaddr *saddr;
2943
2944 saddr = (struct sockaddr *) &server->dstaddr;
2945
2946 if (server->dstaddr.ss_family == AF_INET6) {
2947 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2948 slen = sizeof(struct sockaddr_in6);
2949 sfamily = AF_INET6;
2950 } else {
2951 sport = ((struct sockaddr_in *) saddr)->sin_port;
2952 slen = sizeof(struct sockaddr_in);
2953 sfamily = AF_INET;
2954 }
2955
2956 if (socket == NULL) {
2957 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2958 IPPROTO_TCP, &socket, 1);
2959 if (rc < 0) {
2960 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2961 server->ssocket = NULL;
2962 return rc;
2963 }
2964
2965 /* BB other socket options to set KEEPALIVE, NODELAY? */
2966 cifs_dbg(FYI, "Socket created\n");
2967 server->ssocket = socket;
2968 socket->sk->sk_allocation = GFP_NOFS;
2969 if (sfamily == AF_INET6)
2970 cifs_reclassify_socket6(socket);
2971 else
2972 cifs_reclassify_socket4(socket);
2973 }
2974
2975 rc = bind_socket(server);
2976 if (rc < 0)
2977 return rc;
2978
2979 /*
2980 * Eventually check for other socket options to change from
2981 * the default. sock_setsockopt not used because it expects
2982 * user space buffer
2983 */
2984 socket->sk->sk_rcvtimeo = 7 * HZ;
2985 socket->sk->sk_sndtimeo = 5 * HZ;
2986
2987 /* make the bufsizes depend on wsize/rsize and max requests */
2988 if (server->noautotune) {
2989 if (socket->sk->sk_sndbuf < (200 * 1024))
2990 socket->sk->sk_sndbuf = 200 * 1024;
2991 if (socket->sk->sk_rcvbuf < (140 * 1024))
2992 socket->sk->sk_rcvbuf = 140 * 1024;
2993 }
2994
2995 if (server->tcp_nodelay) {
2996 int val = 1;
2997 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2998 (char *)&val, sizeof(val));
2999 if (rc)
3000 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3001 rc);
3002 }
3003
3004 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3005 socket->sk->sk_sndbuf,
3006 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3007
3008 rc = socket->ops->connect(socket, saddr, slen, 0);
3009 if (rc < 0) {
3010 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3011 sock_release(socket);
3012 server->ssocket = NULL;
3013 return rc;
3014 }
3015
3016 if (sport == htons(RFC1001_PORT))
3017 rc = ip_rfc1001_connect(server);
3018
3019 return rc;
3020 }
3021
3022 static int
3023 ip_connect(struct TCP_Server_Info *server)
3024 {
3025 __be16 *sport;
3026 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3027 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3028
3029 if (server->dstaddr.ss_family == AF_INET6)
3030 sport = &addr6->sin6_port;
3031 else
3032 sport = &addr->sin_port;
3033
3034 if (*sport == 0) {
3035 int rc;
3036
3037 /* try with 445 port at first */
3038 *sport = htons(CIFS_PORT);
3039
3040 rc = generic_ip_connect(server);
3041 if (rc >= 0)
3042 return rc;
3043
3044 /* if it failed, try with 139 port */
3045 *sport = htons(RFC1001_PORT);
3046 }
3047
3048 return generic_ip_connect(server);
3049 }
3050
3051 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3052 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3053 {
3054 /* if we are reconnecting then should we check to see if
3055 * any requested capabilities changed locally e.g. via
3056 * remount but we can not do much about it here
3057 * if they have (even if we could detect it by the following)
3058 * Perhaps we could add a backpointer to array of sb from tcon
3059 * or if we change to make all sb to same share the same
3060 * sb as NFS - then we only have one backpointer to sb.
3061 * What if we wanted to mount the server share twice once with
3062 * and once without posixacls or posix paths? */
3063 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3064
3065 if (vol_info && vol_info->no_linux_ext) {
3066 tcon->fsUnixInfo.Capability = 0;
3067 tcon->unix_ext = 0; /* Unix Extensions disabled */
3068 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3069 return;
3070 } else if (vol_info)
3071 tcon->unix_ext = 1; /* Unix Extensions supported */
3072
3073 if (tcon->unix_ext == 0) {
3074 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3075 return;
3076 }
3077
3078 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3079 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3080 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3081 /* check for reconnect case in which we do not
3082 want to change the mount behavior if we can avoid it */
3083 if (vol_info == NULL) {
3084 /* turn off POSIX ACL and PATHNAMES if not set
3085 originally at mount time */
3086 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3087 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3088 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3089 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3090 cifs_dbg(VFS, "POSIXPATH support change\n");
3091 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3092 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3093 cifs_dbg(VFS, "possible reconnect error\n");
3094 cifs_dbg(VFS, "server disabled POSIX path support\n");
3095 }
3096 }
3097
3098 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3099 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3100
3101 cap &= CIFS_UNIX_CAP_MASK;
3102 if (vol_info && vol_info->no_psx_acl)
3103 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3104 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3105 cifs_dbg(FYI, "negotiated posix acl support\n");
3106 if (cifs_sb)
3107 cifs_sb->mnt_cifs_flags |=
3108 CIFS_MOUNT_POSIXACL;
3109 }
3110
3111 if (vol_info && vol_info->posix_paths == 0)
3112 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3113 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3114 cifs_dbg(FYI, "negotiate posix pathnames\n");
3115 if (cifs_sb)
3116 cifs_sb->mnt_cifs_flags |=
3117 CIFS_MOUNT_POSIX_PATHS;
3118 }
3119
3120 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3121 #ifdef CONFIG_CIFS_DEBUG2
3122 if (cap & CIFS_UNIX_FCNTL_CAP)
3123 cifs_dbg(FYI, "FCNTL cap\n");
3124 if (cap & CIFS_UNIX_EXTATTR_CAP)
3125 cifs_dbg(FYI, "EXTATTR cap\n");
3126 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3127 cifs_dbg(FYI, "POSIX path cap\n");
3128 if (cap & CIFS_UNIX_XATTR_CAP)
3129 cifs_dbg(FYI, "XATTR cap\n");
3130 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3131 cifs_dbg(FYI, "POSIX ACL cap\n");
3132 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3133 cifs_dbg(FYI, "very large read cap\n");
3134 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3135 cifs_dbg(FYI, "very large write cap\n");
3136 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3137 cifs_dbg(FYI, "transport encryption cap\n");
3138 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3139 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3140 #endif /* CIFS_DEBUG2 */
3141 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3142 if (vol_info == NULL) {
3143 cifs_dbg(FYI, "resetting capabilities failed\n");
3144 } else
3145 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3146
3147 }
3148 }
3149 }
3150
3151 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3152 struct cifs_sb_info *cifs_sb)
3153 {
3154 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3155
3156 spin_lock_init(&cifs_sb->tlink_tree_lock);
3157 cifs_sb->tlink_tree = RB_ROOT;
3158
3159 /*
3160 * Temporarily set r/wsize for matching superblock. If we end up using
3161 * new sb then client will later negotiate it downward if needed.
3162 */
3163 cifs_sb->rsize = pvolume_info->rsize;
3164 cifs_sb->wsize = pvolume_info->wsize;
3165
3166 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3167 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3168 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3169 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3170 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3171 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3172
3173 cifs_sb->actimeo = pvolume_info->actimeo;
3174 cifs_sb->local_nls = pvolume_info->local_nls;
3175
3176 if (pvolume_info->noperm)
3177 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3178 if (pvolume_info->setuids)
3179 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3180 if (pvolume_info->server_ino)
3181 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3182 if (pvolume_info->remap)
3183 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3184 if (pvolume_info->no_xattr)
3185 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3186 if (pvolume_info->sfu_emul)
3187 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3188 if (pvolume_info->nobrl)
3189 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3190 if (pvolume_info->nostrictsync)
3191 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3192 if (pvolume_info->mand_lock)
3193 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3194 if (pvolume_info->rwpidforward)
3195 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3196 if (pvolume_info->cifs_acl)
3197 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3198 if (pvolume_info->backupuid_specified) {
3199 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3200 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3201 }
3202 if (pvolume_info->backupgid_specified) {
3203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3204 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3205 }
3206 if (pvolume_info->override_uid)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3208 if (pvolume_info->override_gid)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3210 if (pvolume_info->dynperm)
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3212 if (pvolume_info->fsc)
3213 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3214 if (pvolume_info->multiuser)
3215 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3216 CIFS_MOUNT_NO_PERM);
3217 if (pvolume_info->strict_io)
3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3219 if (pvolume_info->direct_io) {
3220 cifs_dbg(FYI, "mounting share using direct i/o\n");
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3222 }
3223 if (pvolume_info->mfsymlinks) {
3224 if (pvolume_info->sfu_emul) {
3225 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3226 } else {
3227 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3228 }
3229 }
3230
3231 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3232 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3233 }
3234
3235 static void
3236 cleanup_volume_info_contents(struct smb_vol *volume_info)
3237 {
3238 kfree(volume_info->username);
3239 kzfree(volume_info->password);
3240 kfree(volume_info->UNC);
3241 kfree(volume_info->domainname);
3242 kfree(volume_info->iocharset);
3243 kfree(volume_info->prepath);
3244 }
3245
3246 void
3247 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3248 {
3249 if (!volume_info)
3250 return;
3251 cleanup_volume_info_contents(volume_info);
3252 kfree(volume_info);
3253 }
3254
3255
3256 #ifdef CONFIG_CIFS_DFS_UPCALL
3257 /*
3258 * cifs_build_path_to_root returns full path to root when we do not have an
3259 * exiting connection (tcon)
3260 */
3261 static char *
3262 build_unc_path_to_root(const struct smb_vol *vol,
3263 const struct cifs_sb_info *cifs_sb)
3264 {
3265 char *full_path, *pos;
3266 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3267 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3268
3269 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3270 if (full_path == NULL)
3271 return ERR_PTR(-ENOMEM);
3272
3273 strncpy(full_path, vol->UNC, unc_len);
3274 pos = full_path + unc_len;
3275
3276 if (pplen) {
3277 *pos++ = CIFS_DIR_SEP(cifs_sb);
3278 strncpy(pos, vol->prepath, pplen);
3279 pos += pplen;
3280 }
3281
3282 *pos = '\0'; /* add trailing null */
3283 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3284 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3285 return full_path;
3286 }
3287
3288 /*
3289 * Perform a dfs referral query for a share and (optionally) prefix
3290 *
3291 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3292 * to a string containing updated options for the submount. Otherwise it
3293 * will be left untouched.
3294 *
3295 * Returns the rc from get_dfs_path to the caller, which can be used to
3296 * determine whether there were referrals.
3297 */
3298 static int
3299 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3300 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3301 int check_prefix)
3302 {
3303 int rc;
3304 unsigned int num_referrals = 0;
3305 struct dfs_info3_param *referrals = NULL;
3306 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3307
3308 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3309 if (IS_ERR(full_path))
3310 return PTR_ERR(full_path);
3311
3312 /* For DFS paths, skip the first '\' of the UNC */
3313 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3314
3315 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3316 &num_referrals, &referrals,
3317 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3318
3319 if (!rc && num_referrals > 0) {
3320 char *fake_devname = NULL;
3321
3322 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3323 full_path + 1, referrals,
3324 &fake_devname);
3325
3326 free_dfs_info_array(referrals, num_referrals);
3327
3328 if (IS_ERR(mdata)) {
3329 rc = PTR_ERR(mdata);
3330 mdata = NULL;
3331 } else {
3332 cleanup_volume_info_contents(volume_info);
3333 rc = cifs_setup_volume_info(volume_info, mdata,
3334 fake_devname);
3335 }
3336 kfree(fake_devname);
3337 kfree(cifs_sb->mountdata);
3338 cifs_sb->mountdata = mdata;
3339 }
3340 kfree(full_path);
3341 return rc;
3342 }
3343 #endif
3344
3345 static int
3346 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3347 const char *devname)
3348 {
3349 int rc = 0;
3350
3351 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3352 return -EINVAL;
3353
3354 if (volume_info->nullauth) {
3355 cifs_dbg(FYI, "Anonymous login\n");
3356 kfree(volume_info->username);
3357 volume_info->username = NULL;
3358 } else if (volume_info->username) {
3359 /* BB fixme parse for domain name here */
3360 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3361 } else {
3362 cifs_dbg(VFS, "No username specified\n");
3363 /* In userspace mount helper we can get user name from alternate
3364 locations such as env variables and files on disk */
3365 return -EINVAL;
3366 }
3367
3368 /* this is needed for ASCII cp to Unicode converts */
3369 if (volume_info->iocharset == NULL) {
3370 /* load_nls_default cannot return null */
3371 volume_info->local_nls = load_nls_default();
3372 } else {
3373 volume_info->local_nls = load_nls(volume_info->iocharset);
3374 if (volume_info->local_nls == NULL) {
3375 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3376 volume_info->iocharset);
3377 return -ELIBACC;
3378 }
3379 }
3380
3381 return rc;
3382 }
3383
3384 struct smb_vol *
3385 cifs_get_volume_info(char *mount_data, const char *devname)
3386 {
3387 int rc;
3388 struct smb_vol *volume_info;
3389
3390 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3391 if (!volume_info)
3392 return ERR_PTR(-ENOMEM);
3393
3394 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3395 if (rc) {
3396 cifs_cleanup_volume_info(volume_info);
3397 volume_info = ERR_PTR(rc);
3398 }
3399
3400 return volume_info;
3401 }
3402
3403 int
3404 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3405 {
3406 int rc;
3407 unsigned int xid;
3408 struct cifs_ses *ses;
3409 struct cifs_tcon *tcon;
3410 struct TCP_Server_Info *server;
3411 char *full_path;
3412 struct tcon_link *tlink;
3413 #ifdef CONFIG_CIFS_DFS_UPCALL
3414 int referral_walks_count = 0;
3415 #endif
3416
3417 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3418 if (rc)
3419 return rc;
3420
3421 #ifdef CONFIG_CIFS_DFS_UPCALL
3422 try_mount_again:
3423 /* cleanup activities if we're chasing a referral */
3424 if (referral_walks_count) {
3425 if (tcon)
3426 cifs_put_tcon(tcon);
3427 else if (ses)
3428 cifs_put_smb_ses(ses);
3429
3430 free_xid(xid);
3431 }
3432 #endif
3433 rc = 0;
3434 tcon = NULL;
3435 ses = NULL;
3436 server = NULL;
3437 full_path = NULL;
3438 tlink = NULL;
3439
3440 xid = get_xid();
3441
3442 /* get a reference to a tcp session */
3443 server = cifs_get_tcp_session(volume_info);
3444 if (IS_ERR(server)) {
3445 rc = PTR_ERR(server);
3446 bdi_destroy(&cifs_sb->bdi);
3447 goto out;
3448 }
3449
3450 /* get a reference to a SMB session */
3451 ses = cifs_get_smb_ses(server, volume_info);
3452 if (IS_ERR(ses)) {
3453 rc = PTR_ERR(ses);
3454 ses = NULL;
3455 goto mount_fail_check;
3456 }
3457
3458 /* search for existing tcon to this server share */
3459 tcon = cifs_get_tcon(ses, volume_info);
3460 if (IS_ERR(tcon)) {
3461 rc = PTR_ERR(tcon);
3462 tcon = NULL;
3463 goto remote_path_check;
3464 }
3465
3466 /* tell server which Unix caps we support */
3467 if (cap_unix(tcon->ses)) {
3468 /* reset of caps checks mount to see if unix extensions
3469 disabled for just this mount */
3470 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3471 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3472 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3473 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3474 rc = -EACCES;
3475 goto mount_fail_check;
3476 }
3477 } else
3478 tcon->unix_ext = 0; /* server does not support them */
3479
3480 /* do not care if a following call succeed - informational */
3481 if (!tcon->ipc && server->ops->qfs_tcon)
3482 server->ops->qfs_tcon(xid, tcon);
3483
3484 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3485 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3486
3487 /* tune readahead according to rsize */
3488 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3489
3490 remote_path_check:
3491 #ifdef CONFIG_CIFS_DFS_UPCALL
3492 /*
3493 * Perform an unconditional check for whether there are DFS
3494 * referrals for this path without prefix, to provide support
3495 * for DFS referrals from w2k8 servers which don't seem to respond
3496 * with PATH_NOT_COVERED to requests that include the prefix.
3497 * Chase the referral if found, otherwise continue normally.
3498 */
3499 if (referral_walks_count == 0) {
3500 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3501 false);
3502 if (!refrc) {
3503 referral_walks_count++;
3504 goto try_mount_again;
3505 }
3506 }
3507 #endif
3508
3509 /* check if a whole path is not remote */
3510 if (!rc && tcon) {
3511 if (!server->ops->is_path_accessible) {
3512 rc = -ENOSYS;
3513 goto mount_fail_check;
3514 }
3515 /*
3516 * cifs_build_path_to_root works only when we have a valid tcon
3517 */
3518 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3519 if (full_path == NULL) {
3520 rc = -ENOMEM;
3521 goto mount_fail_check;
3522 }
3523 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3524 full_path);
3525 if (rc != 0 && rc != -EREMOTE) {
3526 kfree(full_path);
3527 goto mount_fail_check;
3528 }
3529 kfree(full_path);
3530 }
3531
3532 /* get referral if needed */
3533 if (rc == -EREMOTE) {
3534 #ifdef CONFIG_CIFS_DFS_UPCALL
3535 if (referral_walks_count > MAX_NESTED_LINKS) {
3536 /*
3537 * BB: when we implement proper loop detection,
3538 * we will remove this check. But now we need it
3539 * to prevent an indefinite loop if 'DFS tree' is
3540 * misconfigured (i.e. has loops).
3541 */
3542 rc = -ELOOP;
3543 goto mount_fail_check;
3544 }
3545
3546 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3547
3548 if (!rc) {
3549 referral_walks_count++;
3550 goto try_mount_again;
3551 }
3552 goto mount_fail_check;
3553 #else /* No DFS support, return error on mount */
3554 rc = -EOPNOTSUPP;
3555 #endif
3556 }
3557
3558 if (rc)
3559 goto mount_fail_check;
3560
3561 /* now, hang the tcon off of the superblock */
3562 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3563 if (tlink == NULL) {
3564 rc = -ENOMEM;
3565 goto mount_fail_check;
3566 }
3567
3568 tlink->tl_uid = ses->linux_uid;
3569 tlink->tl_tcon = tcon;
3570 tlink->tl_time = jiffies;
3571 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3572 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3573
3574 cifs_sb->master_tlink = tlink;
3575 spin_lock(&cifs_sb->tlink_tree_lock);
3576 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3577 spin_unlock(&cifs_sb->tlink_tree_lock);
3578
3579 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3580 TLINK_IDLE_EXPIRE);
3581
3582 mount_fail_check:
3583 /* on error free sesinfo and tcon struct if needed */
3584 if (rc) {
3585 /* If find_unc succeeded then rc == 0 so we can not end */
3586 /* up accidentally freeing someone elses tcon struct */
3587 if (tcon)
3588 cifs_put_tcon(tcon);
3589 else if (ses)
3590 cifs_put_smb_ses(ses);
3591 else
3592 cifs_put_tcp_session(server);
3593 bdi_destroy(&cifs_sb->bdi);
3594 }
3595
3596 out:
3597 free_xid(xid);
3598 return rc;
3599 }
3600
3601 /*
3602 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3603 * pointer may be NULL.
3604 */
3605 int
3606 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3607 const char *tree, struct cifs_tcon *tcon,
3608 const struct nls_table *nls_codepage)
3609 {
3610 struct smb_hdr *smb_buffer;
3611 struct smb_hdr *smb_buffer_response;
3612 TCONX_REQ *pSMB;
3613 TCONX_RSP *pSMBr;
3614 unsigned char *bcc_ptr;
3615 int rc = 0;
3616 int length;
3617 __u16 bytes_left, count;
3618
3619 if (ses == NULL)
3620 return -EIO;
3621
3622 smb_buffer = cifs_buf_get();
3623 if (smb_buffer == NULL)
3624 return -ENOMEM;
3625
3626 smb_buffer_response = smb_buffer;
3627
3628 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3629 NULL /*no tid */ , 4 /*wct */ );
3630
3631 smb_buffer->Mid = get_next_mid(ses->server);
3632 smb_buffer->Uid = ses->Suid;
3633 pSMB = (TCONX_REQ *) smb_buffer;
3634 pSMBr = (TCONX_RSP *) smb_buffer_response;
3635
3636 pSMB->AndXCommand = 0xFF;
3637 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3638 bcc_ptr = &pSMB->Password[0];
3639 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3640 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3641 *bcc_ptr = 0; /* password is null byte */
3642 bcc_ptr++; /* skip password */
3643 /* already aligned so no need to do it below */
3644 } else {
3645 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3646 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3647 specified as required (when that support is added to
3648 the vfs in the future) as only NTLM or the much
3649 weaker LANMAN (which we do not send by default) is accepted
3650 by Samba (not sure whether other servers allow
3651 NTLMv2 password here) */
3652 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3653 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3654 (ses->server->secType == LANMAN))
3655 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3656 ses->server->sec_mode &
3657 SECMODE_PW_ENCRYPT ? true : false,
3658 bcc_ptr);
3659 else
3660 #endif /* CIFS_WEAK_PW_HASH */
3661 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3662 bcc_ptr, nls_codepage);
3663
3664 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3665 if (ses->capabilities & CAP_UNICODE) {
3666 /* must align unicode strings */
3667 *bcc_ptr = 0; /* null byte password */
3668 bcc_ptr++;
3669 }
3670 }
3671
3672 if (ses->server->sec_mode &
3673 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3674 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3675
3676 if (ses->capabilities & CAP_STATUS32) {
3677 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3678 }
3679 if (ses->capabilities & CAP_DFS) {
3680 smb_buffer->Flags2 |= SMBFLG2_DFS;
3681 }
3682 if (ses->capabilities & CAP_UNICODE) {
3683 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3684 length =
3685 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3686 6 /* max utf8 char length in bytes */ *
3687 (/* server len*/ + 256 /* share len */), nls_codepage);
3688 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3689 bcc_ptr += 2; /* skip trailing null */
3690 } else { /* ASCII */
3691 strcpy(bcc_ptr, tree);
3692 bcc_ptr += strlen(tree) + 1;
3693 }
3694 strcpy(bcc_ptr, "?????");
3695 bcc_ptr += strlen("?????");
3696 bcc_ptr += 1;
3697 count = bcc_ptr - &pSMB->Password[0];
3698 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3699 pSMB->hdr.smb_buf_length) + count);
3700 pSMB->ByteCount = cpu_to_le16(count);
3701
3702 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3703 0);
3704
3705 /* above now done in SendReceive */
3706 if ((rc == 0) && (tcon != NULL)) {
3707 bool is_unicode;
3708
3709 tcon->tidStatus = CifsGood;
3710 tcon->need_reconnect = false;
3711 tcon->tid = smb_buffer_response->Tid;
3712 bcc_ptr = pByteArea(smb_buffer_response);
3713 bytes_left = get_bcc(smb_buffer_response);
3714 length = strnlen(bcc_ptr, bytes_left - 2);
3715 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3716 is_unicode = true;
3717 else
3718 is_unicode = false;
3719
3720
3721 /* skip service field (NB: this field is always ASCII) */
3722 if (length == 3) {
3723 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3724 (bcc_ptr[2] == 'C')) {
3725 cifs_dbg(FYI, "IPC connection\n");
3726 tcon->ipc = 1;
3727 }
3728 } else if (length == 2) {
3729 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3730 /* the most common case */
3731 cifs_dbg(FYI, "disk share connection\n");
3732 }
3733 }
3734 bcc_ptr += length + 1;
3735 bytes_left -= (length + 1);
3736 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3737
3738 /* mostly informational -- no need to fail on error here */
3739 kfree(tcon->nativeFileSystem);
3740 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3741 bytes_left, is_unicode,
3742 nls_codepage);
3743
3744 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3745
3746 if ((smb_buffer_response->WordCount == 3) ||
3747 (smb_buffer_response->WordCount == 7))
3748 /* field is in same location */
3749 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3750 else
3751 tcon->Flags = 0;
3752 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3753 } else if ((rc == 0) && tcon == NULL) {
3754 /* all we need to save for IPC$ connection */
3755 ses->ipc_tid = smb_buffer_response->Tid;
3756 }
3757
3758 cifs_buf_release(smb_buffer);
3759 return rc;
3760 }
3761
3762 void
3763 cifs_umount(struct cifs_sb_info *cifs_sb)
3764 {
3765 struct rb_root *root = &cifs_sb->tlink_tree;
3766 struct rb_node *node;
3767 struct tcon_link *tlink;
3768
3769 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3770
3771 spin_lock(&cifs_sb->tlink_tree_lock);
3772 while ((node = rb_first(root))) {
3773 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3774 cifs_get_tlink(tlink);
3775 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3776 rb_erase(node, root);
3777
3778 spin_unlock(&cifs_sb->tlink_tree_lock);
3779 cifs_put_tlink(tlink);
3780 spin_lock(&cifs_sb->tlink_tree_lock);
3781 }
3782 spin_unlock(&cifs_sb->tlink_tree_lock);
3783
3784 bdi_destroy(&cifs_sb->bdi);
3785 kfree(cifs_sb->mountdata);
3786 unload_nls(cifs_sb->local_nls);
3787 kfree(cifs_sb);
3788 }
3789
3790 int
3791 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3792 {
3793 int rc = 0;
3794 struct TCP_Server_Info *server = ses->server;
3795
3796 if (!server->ops->need_neg || !server->ops->negotiate)
3797 return -ENOSYS;
3798
3799 /* only send once per connect */
3800 if (!server->ops->need_neg(server))
3801 return 0;
3802
3803 set_credits(server, 1);
3804
3805 rc = server->ops->negotiate(xid, ses);
3806 if (rc == 0) {
3807 spin_lock(&GlobalMid_Lock);
3808 if (server->tcpStatus == CifsNeedNegotiate)
3809 server->tcpStatus = CifsGood;
3810 else
3811 rc = -EHOSTDOWN;
3812 spin_unlock(&GlobalMid_Lock);
3813 }
3814
3815 return rc;
3816 }
3817
3818 int
3819 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3820 struct nls_table *nls_info)
3821 {
3822 int rc = -ENOSYS;
3823 struct TCP_Server_Info *server = ses->server;
3824
3825 ses->flags = 0;
3826 ses->capabilities = server->capabilities;
3827 if (linuxExtEnabled == 0)
3828 ses->capabilities &= (~server->vals->cap_unix);
3829
3830 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3831 server->sec_mode, server->capabilities, server->timeAdj);
3832
3833 if (server->ops->sess_setup)
3834 rc = server->ops->sess_setup(xid, ses, nls_info);
3835
3836 if (rc) {
3837 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3838 } else {
3839 mutex_lock(&server->srv_mutex);
3840 if (!server->session_estab) {
3841 server->session_key.response = ses->auth_key.response;
3842 server->session_key.len = ses->auth_key.len;
3843 server->sequence_number = 0x2;
3844 server->session_estab = true;
3845 ses->auth_key.response = NULL;
3846 }
3847 mutex_unlock(&server->srv_mutex);
3848
3849 cifs_dbg(FYI, "CIFS Session Established successfully\n");
3850 spin_lock(&GlobalMid_Lock);
3851 ses->status = CifsGood;
3852 ses->need_reconnect = false;
3853 spin_unlock(&GlobalMid_Lock);
3854 }
3855
3856 kfree(ses->auth_key.response);
3857 ses->auth_key.response = NULL;
3858 ses->auth_key.len = 0;
3859 kfree(ses->ntlmssp);
3860 ses->ntlmssp = NULL;
3861
3862 return rc;
3863 }
3864
3865 static int
3866 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3867 {
3868 switch (ses->server->secType) {
3869 case Kerberos:
3870 vol->secFlg = CIFSSEC_MUST_KRB5;
3871 return 0;
3872 case NTLMv2:
3873 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3874 break;
3875 case NTLM:
3876 vol->secFlg = CIFSSEC_MUST_NTLM;
3877 break;
3878 case RawNTLMSSP:
3879 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3880 break;
3881 case LANMAN:
3882 vol->secFlg = CIFSSEC_MUST_LANMAN;
3883 break;
3884 }
3885
3886 return cifs_set_cifscreds(vol, ses);
3887 }
3888
3889 static struct cifs_tcon *
3890 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3891 {
3892 int rc;
3893 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3894 struct cifs_ses *ses;
3895 struct cifs_tcon *tcon = NULL;
3896 struct smb_vol *vol_info;
3897
3898 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3899 if (vol_info == NULL)
3900 return ERR_PTR(-ENOMEM);
3901
3902 vol_info->local_nls = cifs_sb->local_nls;
3903 vol_info->linux_uid = fsuid;
3904 vol_info->cred_uid = fsuid;
3905 vol_info->UNC = master_tcon->treeName;
3906 vol_info->retry = master_tcon->retry;
3907 vol_info->nocase = master_tcon->nocase;
3908 vol_info->local_lease = master_tcon->local_lease;
3909 vol_info->no_linux_ext = !master_tcon->unix_ext;
3910
3911 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3912 if (rc) {
3913 tcon = ERR_PTR(rc);
3914 goto out;
3915 }
3916
3917 /* get a reference for the same TCP session */
3918 spin_lock(&cifs_tcp_ses_lock);
3919 ++master_tcon->ses->server->srv_count;
3920 spin_unlock(&cifs_tcp_ses_lock);
3921
3922 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3923 if (IS_ERR(ses)) {
3924 tcon = (struct cifs_tcon *)ses;
3925 cifs_put_tcp_session(master_tcon->ses->server);
3926 goto out;
3927 }
3928
3929 tcon = cifs_get_tcon(ses, vol_info);
3930 if (IS_ERR(tcon)) {
3931 cifs_put_smb_ses(ses);
3932 goto out;
3933 }
3934
3935 if (cap_unix(ses))
3936 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3937 out:
3938 kfree(vol_info->username);
3939 kfree(vol_info->password);
3940 kfree(vol_info);
3941
3942 return tcon;
3943 }
3944
3945 struct cifs_tcon *
3946 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3947 {
3948 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3949 }
3950
3951 static int
3952 cifs_sb_tcon_pending_wait(void *unused)
3953 {
3954 schedule();
3955 return signal_pending(current) ? -ERESTARTSYS : 0;
3956 }
3957
3958 /* find and return a tlink with given uid */
3959 static struct tcon_link *
3960 tlink_rb_search(struct rb_root *root, kuid_t uid)
3961 {
3962 struct rb_node *node = root->rb_node;
3963 struct tcon_link *tlink;
3964
3965 while (node) {
3966 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3967
3968 if (uid_gt(tlink->tl_uid, uid))
3969 node = node->rb_left;
3970 else if (uid_lt(tlink->tl_uid, uid))
3971 node = node->rb_right;
3972 else
3973 return tlink;
3974 }
3975 return NULL;
3976 }
3977
3978 /* insert a tcon_link into the tree */
3979 static void
3980 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3981 {
3982 struct rb_node **new = &(root->rb_node), *parent = NULL;
3983 struct tcon_link *tlink;
3984
3985 while (*new) {
3986 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3987 parent = *new;
3988
3989 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3990 new = &((*new)->rb_left);
3991 else
3992 new = &((*new)->rb_right);
3993 }
3994
3995 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3996 rb_insert_color(&new_tlink->tl_rbnode, root);
3997 }
3998
3999 /*
4000 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4001 * current task.
4002 *
4003 * If the superblock doesn't refer to a multiuser mount, then just return
4004 * the master tcon for the mount.
4005 *
4006 * First, search the rbtree for an existing tcon for this fsuid. If one
4007 * exists, then check to see if it's pending construction. If it is then wait
4008 * for construction to complete. Once it's no longer pending, check to see if
4009 * it failed and either return an error or retry construction, depending on
4010 * the timeout.
4011 *
4012 * If one doesn't exist then insert a new tcon_link struct into the tree and
4013 * try to construct a new one.
4014 */
4015 struct tcon_link *
4016 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4017 {
4018 int ret;
4019 kuid_t fsuid = current_fsuid();
4020 struct tcon_link *tlink, *newtlink;
4021
4022 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4023 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4024
4025 spin_lock(&cifs_sb->tlink_tree_lock);
4026 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4027 if (tlink)
4028 cifs_get_tlink(tlink);
4029 spin_unlock(&cifs_sb->tlink_tree_lock);
4030
4031 if (tlink == NULL) {
4032 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4033 if (newtlink == NULL)
4034 return ERR_PTR(-ENOMEM);
4035 newtlink->tl_uid = fsuid;
4036 newtlink->tl_tcon = ERR_PTR(-EACCES);
4037 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4038 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4039 cifs_get_tlink(newtlink);
4040
4041 spin_lock(&cifs_sb->tlink_tree_lock);
4042 /* was one inserted after previous search? */
4043 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4044 if (tlink) {
4045 cifs_get_tlink(tlink);
4046 spin_unlock(&cifs_sb->tlink_tree_lock);
4047 kfree(newtlink);
4048 goto wait_for_construction;
4049 }
4050 tlink = newtlink;
4051 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4052 spin_unlock(&cifs_sb->tlink_tree_lock);
4053 } else {
4054 wait_for_construction:
4055 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4056 cifs_sb_tcon_pending_wait,
4057 TASK_INTERRUPTIBLE);
4058 if (ret) {
4059 cifs_put_tlink(tlink);
4060 return ERR_PTR(ret);
4061 }
4062
4063 /* if it's good, return it */
4064 if (!IS_ERR(tlink->tl_tcon))
4065 return tlink;
4066
4067 /* return error if we tried this already recently */
4068 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4069 cifs_put_tlink(tlink);
4070 return ERR_PTR(-EACCES);
4071 }
4072
4073 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4074 goto wait_for_construction;
4075 }
4076
4077 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4078 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4079 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4080
4081 if (IS_ERR(tlink->tl_tcon)) {
4082 cifs_put_tlink(tlink);
4083 return ERR_PTR(-EACCES);
4084 }
4085
4086 return tlink;
4087 }
4088
4089 /*
4090 * periodic workqueue job that scans tcon_tree for a superblock and closes
4091 * out tcons.
4092 */
4093 static void
4094 cifs_prune_tlinks(struct work_struct *work)
4095 {
4096 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4097 prune_tlinks.work);
4098 struct rb_root *root = &cifs_sb->tlink_tree;
4099 struct rb_node *node = rb_first(root);
4100 struct rb_node *tmp;
4101 struct tcon_link *tlink;
4102
4103 /*
4104 * Because we drop the spinlock in the loop in order to put the tlink
4105 * it's not guarded against removal of links from the tree. The only
4106 * places that remove entries from the tree are this function and
4107 * umounts. Because this function is non-reentrant and is canceled
4108 * before umount can proceed, this is safe.
4109 */
4110 spin_lock(&cifs_sb->tlink_tree_lock);
4111 node = rb_first(root);
4112 while (node != NULL) {
4113 tmp = node;
4114 node = rb_next(tmp);
4115 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4116
4117 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4118 atomic_read(&tlink->tl_count) != 0 ||
4119 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4120 continue;
4121
4122 cifs_get_tlink(tlink);
4123 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4124 rb_erase(tmp, root);
4125
4126 spin_unlock(&cifs_sb->tlink_tree_lock);
4127 cifs_put_tlink(tlink);
4128 spin_lock(&cifs_sb->tlink_tree_lock);
4129 }
4130 spin_unlock(&cifs_sb->tlink_tree_lock);
4131
4132 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4133 TLINK_IDLE_EXPIRE);
4134 }
kernel source for telekom puls (alcatel/mediatek)