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[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 #ifdef CONFIG_CIFS_SMB2
56 #include "smb2proto.h"
57 #endif
58
59 #define CIFS_PORT 445
60 #define RFC1001_PORT 139
61
62 extern mempool_t *cifs_req_poolp;
63
64 /* FIXME: should these be tunable? */
65 #define TLINK_ERROR_EXPIRE (1 * HZ)
66 #define TLINK_IDLE_EXPIRE (600 * HZ)
67
68 enum {
69
70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
73 Opt_forcegid, Opt_noforcegid,
74 Opt_noblocksend, Opt_noautotune,
75 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
76 Opt_mapchars, Opt_nomapchars, Opt_sfu,
77 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
78 Opt_noposixpaths, Opt_nounix,
79 Opt_nocase,
80 Opt_brl, Opt_nobrl,
81 Opt_forcemandatorylock, Opt_setuids,
82 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
83 Opt_nohard, Opt_nosoft,
84 Opt_nointr, Opt_intr,
85 Opt_nostrictsync, Opt_strictsync,
86 Opt_serverino, Opt_noserverino,
87 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
88 Opt_acl, Opt_noacl, Opt_locallease,
89 Opt_sign, Opt_seal, Opt_noac,
90 Opt_fsc, Opt_mfsymlinks,
91 Opt_multiuser, Opt_sloppy,
92
93 /* Mount options which take numeric value */
94 Opt_backupuid, Opt_backupgid, Opt_uid,
95 Opt_cruid, Opt_gid, Opt_file_mode,
96 Opt_dirmode, Opt_port,
97 Opt_rsize, Opt_wsize, Opt_actimeo,
98
99 /* Mount options which take string value */
100 Opt_user, Opt_pass, Opt_ip,
101 Opt_domain, Opt_srcaddr, Opt_iocharset,
102 Opt_netbiosname, Opt_servern,
103 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
104
105 /* Mount options to be ignored */
106 Opt_ignore,
107
108 /* Options which could be blank */
109 Opt_blank_pass,
110 Opt_blank_user,
111 Opt_blank_ip,
112
113 Opt_err
114 };
115
116 static const match_table_t cifs_mount_option_tokens = {
117
118 { Opt_user_xattr, "user_xattr" },
119 { Opt_nouser_xattr, "nouser_xattr" },
120 { Opt_forceuid, "forceuid" },
121 { Opt_noforceuid, "noforceuid" },
122 { Opt_forcegid, "forcegid" },
123 { Opt_noforcegid, "noforcegid" },
124 { Opt_noblocksend, "noblocksend" },
125 { Opt_noautotune, "noautotune" },
126 { Opt_hard, "hard" },
127 { Opt_soft, "soft" },
128 { Opt_perm, "perm" },
129 { Opt_noperm, "noperm" },
130 { Opt_mapchars, "mapchars" },
131 { Opt_nomapchars, "nomapchars" },
132 { Opt_sfu, "sfu" },
133 { Opt_nosfu, "nosfu" },
134 { Opt_nodfs, "nodfs" },
135 { Opt_posixpaths, "posixpaths" },
136 { Opt_noposixpaths, "noposixpaths" },
137 { Opt_nounix, "nounix" },
138 { Opt_nounix, "nolinux" },
139 { Opt_nocase, "nocase" },
140 { Opt_nocase, "ignorecase" },
141 { Opt_brl, "brl" },
142 { Opt_nobrl, "nobrl" },
143 { Opt_nobrl, "nolock" },
144 { Opt_forcemandatorylock, "forcemandatorylock" },
145 { Opt_forcemandatorylock, "forcemand" },
146 { Opt_setuids, "setuids" },
147 { Opt_nosetuids, "nosetuids" },
148 { Opt_dynperm, "dynperm" },
149 { Opt_nodynperm, "nodynperm" },
150 { Opt_nohard, "nohard" },
151 { Opt_nosoft, "nosoft" },
152 { Opt_nointr, "nointr" },
153 { Opt_intr, "intr" },
154 { Opt_nostrictsync, "nostrictsync" },
155 { Opt_strictsync, "strictsync" },
156 { Opt_serverino, "serverino" },
157 { Opt_noserverino, "noserverino" },
158 { Opt_rwpidforward, "rwpidforward" },
159 { Opt_cifsacl, "cifsacl" },
160 { Opt_nocifsacl, "nocifsacl" },
161 { Opt_acl, "acl" },
162 { Opt_noacl, "noacl" },
163 { Opt_locallease, "locallease" },
164 { Opt_sign, "sign" },
165 { Opt_seal, "seal" },
166 { Opt_noac, "noac" },
167 { Opt_fsc, "fsc" },
168 { Opt_mfsymlinks, "mfsymlinks" },
169 { Opt_multiuser, "multiuser" },
170 { Opt_sloppy, "sloppy" },
171
172 { Opt_backupuid, "backupuid=%s" },
173 { Opt_backupgid, "backupgid=%s" },
174 { Opt_uid, "uid=%s" },
175 { Opt_cruid, "cruid=%s" },
176 { Opt_gid, "gid=%s" },
177 { Opt_file_mode, "file_mode=%s" },
178 { Opt_dirmode, "dirmode=%s" },
179 { Opt_dirmode, "dir_mode=%s" },
180 { Opt_port, "port=%s" },
181 { Opt_rsize, "rsize=%s" },
182 { Opt_wsize, "wsize=%s" },
183 { Opt_actimeo, "actimeo=%s" },
184
185 { Opt_blank_user, "user=" },
186 { Opt_blank_user, "username=" },
187 { Opt_user, "user=%s" },
188 { Opt_user, "username=%s" },
189 { Opt_blank_pass, "pass=" },
190 { Opt_blank_pass, "password=" },
191 { Opt_pass, "pass=%s" },
192 { Opt_pass, "password=%s" },
193 { Opt_blank_ip, "ip=" },
194 { Opt_blank_ip, "addr=" },
195 { Opt_ip, "ip=%s" },
196 { Opt_ip, "addr=%s" },
197 { Opt_ignore, "unc=%s" },
198 { Opt_ignore, "target=%s" },
199 { Opt_ignore, "path=%s" },
200 { Opt_domain, "dom=%s" },
201 { Opt_domain, "domain=%s" },
202 { Opt_domain, "workgroup=%s" },
203 { Opt_srcaddr, "srcaddr=%s" },
204 { Opt_ignore, "prefixpath=%s" },
205 { Opt_iocharset, "iocharset=%s" },
206 { Opt_netbiosname, "netbiosname=%s" },
207 { Opt_servern, "servern=%s" },
208 { Opt_ver, "ver=%s" },
209 { Opt_vers, "vers=%s" },
210 { Opt_sec, "sec=%s" },
211 { Opt_cache, "cache=%s" },
212
213 { Opt_ignore, "cred" },
214 { Opt_ignore, "credentials" },
215 { Opt_ignore, "cred=%s" },
216 { Opt_ignore, "credentials=%s" },
217 { Opt_ignore, "guest" },
218 { Opt_ignore, "rw" },
219 { Opt_ignore, "ro" },
220 { Opt_ignore, "suid" },
221 { Opt_ignore, "nosuid" },
222 { Opt_ignore, "exec" },
223 { Opt_ignore, "noexec" },
224 { Opt_ignore, "nodev" },
225 { Opt_ignore, "noauto" },
226 { Opt_ignore, "dev" },
227 { Opt_ignore, "mand" },
228 { Opt_ignore, "nomand" },
229 { Opt_ignore, "_netdev" },
230
231 { Opt_err, NULL }
232 };
233
234 enum {
235 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
236 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
237 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
238 Opt_sec_ntlmv2i, Opt_sec_lanman,
239 Opt_sec_none,
240
241 Opt_sec_err
242 };
243
244 static const match_table_t cifs_secflavor_tokens = {
245 { Opt_sec_krb5, "krb5" },
246 { Opt_sec_krb5i, "krb5i" },
247 { Opt_sec_krb5p, "krb5p" },
248 { Opt_sec_ntlmsspi, "ntlmsspi" },
249 { Opt_sec_ntlmssp, "ntlmssp" },
250 { Opt_ntlm, "ntlm" },
251 { Opt_sec_ntlmi, "ntlmi" },
252 { Opt_sec_ntlmv2, "nontlm" },
253 { Opt_sec_ntlmv2, "ntlmv2" },
254 { Opt_sec_ntlmv2i, "ntlmv2i" },
255 { Opt_sec_lanman, "lanman" },
256 { Opt_sec_none, "none" },
257
258 { Opt_sec_err, NULL }
259 };
260
261 /* cache flavors */
262 enum {
263 Opt_cache_loose,
264 Opt_cache_strict,
265 Opt_cache_none,
266 Opt_cache_err
267 };
268
269 static const match_table_t cifs_cacheflavor_tokens = {
270 { Opt_cache_loose, "loose" },
271 { Opt_cache_strict, "strict" },
272 { Opt_cache_none, "none" },
273 { Opt_cache_err, NULL }
274 };
275
276 static const match_table_t cifs_smb_version_tokens = {
277 { Smb_1, SMB1_VERSION_STRING },
278 { Smb_20, SMB20_VERSION_STRING},
279 { Smb_21, SMB21_VERSION_STRING },
280 { Smb_30, SMB30_VERSION_STRING },
281 };
282
283 static int ip_connect(struct TCP_Server_Info *server);
284 static int generic_ip_connect(struct TCP_Server_Info *server);
285 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
286 static void cifs_prune_tlinks(struct work_struct *work);
287 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
288 const char *devname);
289
290 /*
291 * cifs tcp session reconnection
292 *
293 * mark tcp session as reconnecting so temporarily locked
294 * mark all smb sessions as reconnecting for tcp session
295 * reconnect tcp session
296 * wake up waiters on reconnection? - (not needed currently)
297 */
298 int
299 cifs_reconnect(struct TCP_Server_Info *server)
300 {
301 int rc = 0;
302 struct list_head *tmp, *tmp2;
303 struct cifs_ses *ses;
304 struct cifs_tcon *tcon;
305 struct mid_q_entry *mid_entry;
306 struct list_head retry_list;
307
308 spin_lock(&GlobalMid_Lock);
309 if (server->tcpStatus == CifsExiting) {
310 /* the demux thread will exit normally
311 next time through the loop */
312 spin_unlock(&GlobalMid_Lock);
313 return rc;
314 } else
315 server->tcpStatus = CifsNeedReconnect;
316 spin_unlock(&GlobalMid_Lock);
317 server->maxBuf = 0;
318 #ifdef CONFIG_CIFS_SMB2
319 server->max_read = 0;
320 #endif
321
322 cifs_dbg(FYI, "Reconnecting tcp session\n");
323
324 /* before reconnecting the tcp session, mark the smb session (uid)
325 and the tid bad so they are not used until reconnected */
326 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
327 __func__);
328 spin_lock(&cifs_tcp_ses_lock);
329 list_for_each(tmp, &server->smb_ses_list) {
330 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
331 ses->need_reconnect = true;
332 ses->ipc_tid = 0;
333 list_for_each(tmp2, &ses->tcon_list) {
334 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
335 tcon->need_reconnect = true;
336 }
337 }
338 spin_unlock(&cifs_tcp_ses_lock);
339
340 /* do not want to be sending data on a socket we are freeing */
341 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
342 mutex_lock(&server->srv_mutex);
343 if (server->ssocket) {
344 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
345 server->ssocket->state, server->ssocket->flags);
346 kernel_sock_shutdown(server->ssocket, SHUT_WR);
347 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
348 server->ssocket->state, server->ssocket->flags);
349 sock_release(server->ssocket);
350 server->ssocket = NULL;
351 }
352 server->sequence_number = 0;
353 server->session_estab = false;
354 kfree(server->session_key.response);
355 server->session_key.response = NULL;
356 server->session_key.len = 0;
357 server->lstrp = jiffies;
358 mutex_unlock(&server->srv_mutex);
359
360 /* mark submitted MIDs for retry and issue callback */
361 INIT_LIST_HEAD(&retry_list);
362 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
363 spin_lock(&GlobalMid_Lock);
364 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
365 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
366 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
367 mid_entry->mid_state = MID_RETRY_NEEDED;
368 list_move(&mid_entry->qhead, &retry_list);
369 }
370 spin_unlock(&GlobalMid_Lock);
371
372 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
373 list_for_each_safe(tmp, tmp2, &retry_list) {
374 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
375 list_del_init(&mid_entry->qhead);
376 mid_entry->callback(mid_entry);
377 }
378
379 do {
380 try_to_freeze();
381
382 /* we should try only the port we connected to before */
383 mutex_lock(&server->srv_mutex);
384 rc = generic_ip_connect(server);
385 if (rc) {
386 cifs_dbg(FYI, "reconnect error %d\n", rc);
387 msleep(3000);
388 } else {
389 atomic_inc(&tcpSesReconnectCount);
390 spin_lock(&GlobalMid_Lock);
391 if (server->tcpStatus != CifsExiting)
392 server->tcpStatus = CifsNeedNegotiate;
393 spin_unlock(&GlobalMid_Lock);
394 }
395 mutex_unlock(&server->srv_mutex);
396 } while (server->tcpStatus == CifsNeedReconnect);
397
398 return rc;
399 }
400
401 static void
402 cifs_echo_request(struct work_struct *work)
403 {
404 int rc;
405 struct TCP_Server_Info *server = container_of(work,
406 struct TCP_Server_Info, echo.work);
407
408 /*
409 * We cannot send an echo if it is disabled or until the
410 * NEGOTIATE_PROTOCOL request is done, which is indicated by
411 * server->ops->need_neg() == true. Also, no need to ping if
412 * we got a response recently.
413 */
414
415 if (server->tcpStatus == CifsNeedReconnect ||
416 server->tcpStatus == CifsExiting || server->tcpStatus == CifsNew ||
417 (server->ops->can_echo && !server->ops->can_echo(server)) ||
418 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
419 goto requeue_echo;
420
421 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
422 if (rc)
423 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
424 server->hostname);
425
426 requeue_echo:
427 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
428 }
429
430 static bool
431 allocate_buffers(struct TCP_Server_Info *server)
432 {
433 if (!server->bigbuf) {
434 server->bigbuf = (char *)cifs_buf_get();
435 if (!server->bigbuf) {
436 cifs_dbg(VFS, "No memory for large SMB response\n");
437 msleep(3000);
438 /* retry will check if exiting */
439 return false;
440 }
441 } else if (server->large_buf) {
442 /* we are reusing a dirty large buf, clear its start */
443 memset(server->bigbuf, 0, HEADER_SIZE(server));
444 }
445
446 if (!server->smallbuf) {
447 server->smallbuf = (char *)cifs_small_buf_get();
448 if (!server->smallbuf) {
449 cifs_dbg(VFS, "No memory for SMB response\n");
450 msleep(1000);
451 /* retry will check if exiting */
452 return false;
453 }
454 /* beginning of smb buffer is cleared in our buf_get */
455 } else {
456 /* if existing small buf clear beginning */
457 memset(server->smallbuf, 0, HEADER_SIZE(server));
458 }
459
460 return true;
461 }
462
463 static bool
464 server_unresponsive(struct TCP_Server_Info *server)
465 {
466 /*
467 * We need to wait 2 echo intervals to make sure we handle such
468 * situations right:
469 * 1s client sends a normal SMB request
470 * 2s client gets a response
471 * 30s echo workqueue job pops, and decides we got a response recently
472 * and don't need to send another
473 * ...
474 * 65s kernel_recvmsg times out, and we see that we haven't gotten
475 * a response in >60s.
476 */
477 if (server->tcpStatus == CifsGood &&
478 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
479 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
480 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
481 cifs_reconnect(server);
482 wake_up(&server->response_q);
483 return true;
484 }
485
486 return false;
487 }
488
489 /*
490 * kvec_array_init - clone a kvec array, and advance into it
491 * @new: pointer to memory for cloned array
492 * @iov: pointer to original array
493 * @nr_segs: number of members in original array
494 * @bytes: number of bytes to advance into the cloned array
495 *
496 * This function will copy the array provided in iov to a section of memory
497 * and advance the specified number of bytes into the new array. It returns
498 * the number of segments in the new array. "new" must be at least as big as
499 * the original iov array.
500 */
501 static unsigned int
502 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
503 size_t bytes)
504 {
505 size_t base = 0;
506
507 while (bytes || !iov->iov_len) {
508 int copy = min(bytes, iov->iov_len);
509
510 bytes -= copy;
511 base += copy;
512 if (iov->iov_len == base) {
513 iov++;
514 nr_segs--;
515 base = 0;
516 }
517 }
518 memcpy(new, iov, sizeof(*iov) * nr_segs);
519 new->iov_base += base;
520 new->iov_len -= base;
521 return nr_segs;
522 }
523
524 static struct kvec *
525 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
526 {
527 struct kvec *new_iov;
528
529 if (server->iov && nr_segs <= server->nr_iov)
530 return server->iov;
531
532 /* not big enough -- allocate a new one and release the old */
533 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
534 if (new_iov) {
535 kfree(server->iov);
536 server->iov = new_iov;
537 server->nr_iov = nr_segs;
538 }
539 return new_iov;
540 }
541
542 int
543 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
544 unsigned int nr_segs, unsigned int to_read)
545 {
546 int length = 0;
547 int total_read;
548 unsigned int segs;
549 struct msghdr smb_msg;
550 struct kvec *iov;
551
552 iov = get_server_iovec(server, nr_segs);
553 if (!iov)
554 return -ENOMEM;
555
556 smb_msg.msg_control = NULL;
557 smb_msg.msg_controllen = 0;
558
559 for (total_read = 0; to_read; total_read += length, to_read -= length) {
560 try_to_freeze();
561
562 if (server_unresponsive(server)) {
563 total_read = -EAGAIN;
564 break;
565 }
566
567 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
568
569 length = kernel_recvmsg(server->ssocket, &smb_msg,
570 iov, segs, to_read, 0);
571
572 if (server->tcpStatus == CifsExiting) {
573 total_read = -ESHUTDOWN;
574 break;
575 } else if (server->tcpStatus == CifsNeedReconnect) {
576 cifs_reconnect(server);
577 total_read = -EAGAIN;
578 break;
579 } else if (length == -ERESTARTSYS ||
580 length == -EAGAIN ||
581 length == -EINTR) {
582 /*
583 * Minimum sleep to prevent looping, allowing socket
584 * to clear and app threads to set tcpStatus
585 * CifsNeedReconnect if server hung.
586 */
587 usleep_range(1000, 2000);
588 length = 0;
589 continue;
590 } else if (length <= 0) {
591 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
592 "got %d", to_read, length);
593 cifs_reconnect(server);
594 total_read = -EAGAIN;
595 break;
596 }
597 }
598 return total_read;
599 }
600
601 int
602 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
603 unsigned int to_read)
604 {
605 struct kvec iov;
606
607 iov.iov_base = buf;
608 iov.iov_len = to_read;
609
610 return cifs_readv_from_socket(server, &iov, 1, to_read);
611 }
612
613 static bool
614 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
615 {
616 /*
617 * The first byte big endian of the length field,
618 * is actually not part of the length but the type
619 * with the most common, zero, as regular data.
620 */
621 switch (type) {
622 case RFC1002_SESSION_MESSAGE:
623 /* Regular SMB response */
624 return true;
625 case RFC1002_SESSION_KEEP_ALIVE:
626 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
627 break;
628 case RFC1002_POSITIVE_SESSION_RESPONSE:
629 cifs_dbg(FYI, "RFC 1002 positive session response\n");
630 break;
631 case RFC1002_NEGATIVE_SESSION_RESPONSE:
632 /*
633 * We get this from Windows 98 instead of an error on
634 * SMB negprot response.
635 */
636 cifs_dbg(FYI, "RFC 1002 negative session response\n");
637 /* give server a second to clean up */
638 msleep(1000);
639 /*
640 * Always try 445 first on reconnect since we get NACK
641 * on some if we ever connected to port 139 (the NACK
642 * is since we do not begin with RFC1001 session
643 * initialize frame).
644 */
645 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
646 cifs_reconnect(server);
647 wake_up(&server->response_q);
648 break;
649 default:
650 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
651 cifs_reconnect(server);
652 }
653
654 return false;
655 }
656
657 void
658 dequeue_mid(struct mid_q_entry *mid, bool malformed)
659 {
660 #ifdef CONFIG_CIFS_STATS2
661 mid->when_received = jiffies;
662 #endif
663 spin_lock(&GlobalMid_Lock);
664 if (!malformed)
665 mid->mid_state = MID_RESPONSE_RECEIVED;
666 else
667 mid->mid_state = MID_RESPONSE_MALFORMED;
668 list_del_init(&mid->qhead);
669 spin_unlock(&GlobalMid_Lock);
670 }
671
672 static void
673 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
674 char *buf, int malformed)
675 {
676 if (server->ops->check_trans2 &&
677 server->ops->check_trans2(mid, server, buf, malformed))
678 return;
679 mid->resp_buf = buf;
680 mid->large_buf = server->large_buf;
681 /* Was previous buf put in mpx struct for multi-rsp? */
682 if (!mid->multiRsp) {
683 /* smb buffer will be freed by user thread */
684 if (server->large_buf)
685 server->bigbuf = NULL;
686 else
687 server->smallbuf = NULL;
688 }
689 dequeue_mid(mid, malformed);
690 }
691
692 static void clean_demultiplex_info(struct TCP_Server_Info *server)
693 {
694 int length;
695
696 /* take it off the list, if it's not already */
697 spin_lock(&cifs_tcp_ses_lock);
698 list_del_init(&server->tcp_ses_list);
699 spin_unlock(&cifs_tcp_ses_lock);
700
701 spin_lock(&GlobalMid_Lock);
702 server->tcpStatus = CifsExiting;
703 spin_unlock(&GlobalMid_Lock);
704 wake_up_all(&server->response_q);
705
706 /* check if we have blocked requests that need to free */
707 spin_lock(&server->req_lock);
708 if (server->credits <= 0)
709 server->credits = 1;
710 spin_unlock(&server->req_lock);
711 /*
712 * Although there should not be any requests blocked on this queue it
713 * can not hurt to be paranoid and try to wake up requests that may
714 * haven been blocked when more than 50 at time were on the wire to the
715 * same server - they now will see the session is in exit state and get
716 * out of SendReceive.
717 */
718 wake_up_all(&server->request_q);
719 /* give those requests time to exit */
720 msleep(125);
721
722 if (server->ssocket) {
723 sock_release(server->ssocket);
724 server->ssocket = NULL;
725 }
726
727 if (!list_empty(&server->pending_mid_q)) {
728 struct list_head dispose_list;
729 struct mid_q_entry *mid_entry;
730 struct list_head *tmp, *tmp2;
731
732 INIT_LIST_HEAD(&dispose_list);
733 spin_lock(&GlobalMid_Lock);
734 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
735 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
736 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
737 mid_entry->mid_state = MID_SHUTDOWN;
738 list_move(&mid_entry->qhead, &dispose_list);
739 }
740 spin_unlock(&GlobalMid_Lock);
741
742 /* now walk dispose list and issue callbacks */
743 list_for_each_safe(tmp, tmp2, &dispose_list) {
744 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
745 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
746 list_del_init(&mid_entry->qhead);
747 mid_entry->callback(mid_entry);
748 }
749 /* 1/8th of sec is more than enough time for them to exit */
750 msleep(125);
751 }
752
753 if (!list_empty(&server->pending_mid_q)) {
754 /*
755 * mpx threads have not exited yet give them at least the smb
756 * send timeout time for long ops.
757 *
758 * Due to delays on oplock break requests, we need to wait at
759 * least 45 seconds before giving up on a request getting a
760 * response and going ahead and killing cifsd.
761 */
762 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
763 msleep(46000);
764 /*
765 * If threads still have not exited they are probably never
766 * coming home not much else we can do but free the memory.
767 */
768 }
769
770 kfree(server->hostname);
771 kfree(server->iov);
772 kfree(server);
773
774 length = atomic_dec_return(&tcpSesAllocCount);
775 if (length > 0)
776 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
777 GFP_KERNEL);
778 }
779
780 static int
781 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
782 {
783 int length;
784 char *buf = server->smallbuf;
785 unsigned int pdu_length = get_rfc1002_length(buf);
786
787 /* make sure this will fit in a large buffer */
788 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
789 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
790 cifs_reconnect(server);
791 wake_up(&server->response_q);
792 return -EAGAIN;
793 }
794
795 /* switch to large buffer if too big for a small one */
796 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
797 server->large_buf = true;
798 memcpy(server->bigbuf, buf, server->total_read);
799 buf = server->bigbuf;
800 }
801
802 /* now read the rest */
803 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
804 pdu_length - HEADER_SIZE(server) + 1 + 4);
805 if (length < 0)
806 return length;
807 server->total_read += length;
808
809 dump_smb(buf, server->total_read);
810
811 /*
812 * We know that we received enough to get to the MID as we
813 * checked the pdu_length earlier. Now check to see
814 * if the rest of the header is OK. We borrow the length
815 * var for the rest of the loop to avoid a new stack var.
816 *
817 * 48 bytes is enough to display the header and a little bit
818 * into the payload for debugging purposes.
819 */
820 length = server->ops->check_message(buf, server->total_read);
821 if (length != 0)
822 cifs_dump_mem("Bad SMB: ", buf,
823 min_t(unsigned int, server->total_read, 48));
824
825 if (server->ops->is_status_pending &&
826 server->ops->is_status_pending(buf, server, length))
827 return -1;
828
829 if (!mid)
830 return length;
831
832 handle_mid(mid, server, buf, length);
833 return 0;
834 }
835
836 static int
837 cifs_demultiplex_thread(void *p)
838 {
839 int length;
840 struct TCP_Server_Info *server = p;
841 unsigned int pdu_length;
842 char *buf = NULL;
843 struct task_struct *task_to_wake = NULL;
844 struct mid_q_entry *mid_entry;
845
846 current->flags |= PF_MEMALLOC;
847 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
848
849 length = atomic_inc_return(&tcpSesAllocCount);
850 if (length > 1)
851 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
852 GFP_KERNEL);
853
854 set_freezable();
855 while (server->tcpStatus != CifsExiting) {
856 if (try_to_freeze())
857 continue;
858
859 if (!allocate_buffers(server))
860 continue;
861
862 server->large_buf = false;
863 buf = server->smallbuf;
864 pdu_length = 4; /* enough to get RFC1001 header */
865
866 length = cifs_read_from_socket(server, buf, pdu_length);
867 if (length < 0)
868 continue;
869 server->total_read = length;
870
871 /*
872 * The right amount was read from socket - 4 bytes,
873 * so we can now interpret the length field.
874 */
875 pdu_length = get_rfc1002_length(buf);
876
877 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
878 if (!is_smb_response(server, buf[0]))
879 continue;
880
881 /* make sure we have enough to get to the MID */
882 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
883 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
884 pdu_length);
885 cifs_reconnect(server);
886 wake_up(&server->response_q);
887 continue;
888 }
889
890 /* read down to the MID */
891 length = cifs_read_from_socket(server, buf + 4,
892 HEADER_SIZE(server) - 1 - 4);
893 if (length < 0)
894 continue;
895 server->total_read += length;
896
897 mid_entry = server->ops->find_mid(server, buf);
898
899 if (!mid_entry || !mid_entry->receive)
900 length = standard_receive3(server, mid_entry);
901 else
902 length = mid_entry->receive(server, mid_entry);
903
904 if (length < 0)
905 continue;
906
907 if (server->large_buf)
908 buf = server->bigbuf;
909
910 server->lstrp = jiffies;
911 if (mid_entry != NULL) {
912 if (!mid_entry->multiRsp || mid_entry->multiEnd)
913 mid_entry->callback(mid_entry);
914 } else if (!server->ops->is_oplock_break ||
915 !server->ops->is_oplock_break(buf, server)) {
916 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
917 atomic_read(&midCount));
918 cifs_dump_mem("Received Data is: ", buf,
919 HEADER_SIZE(server));
920 #ifdef CONFIG_CIFS_DEBUG2
921 if (server->ops->dump_detail)
922 server->ops->dump_detail(buf);
923 cifs_dump_mids(server);
924 #endif /* CIFS_DEBUG2 */
925
926 }
927 } /* end while !EXITING */
928
929 /* buffer usually freed in free_mid - need to free it here on exit */
930 cifs_buf_release(server->bigbuf);
931 if (server->smallbuf) /* no sense logging a debug message if NULL */
932 cifs_small_buf_release(server->smallbuf);
933
934 task_to_wake = xchg(&server->tsk, NULL);
935 clean_demultiplex_info(server);
936
937 /* if server->tsk was NULL then wait for a signal before exiting */
938 if (!task_to_wake) {
939 set_current_state(TASK_INTERRUPTIBLE);
940 while (!signal_pending(current)) {
941 schedule();
942 set_current_state(TASK_INTERRUPTIBLE);
943 }
944 set_current_state(TASK_RUNNING);
945 }
946
947 module_put_and_exit(0);
948 }
949
950 /* extract the host portion of the UNC string */
951 static char *
952 extract_hostname(const char *unc)
953 {
954 const char *src;
955 char *dst, *delim;
956 unsigned int len;
957
958 /* skip double chars at beginning of string */
959 /* BB: check validity of these bytes? */
960 src = unc + 2;
961
962 /* delimiter between hostname and sharename is always '\\' now */
963 delim = strchr(src, '\\');
964 if (!delim)
965 return ERR_PTR(-EINVAL);
966
967 len = delim - src;
968 dst = kmalloc((len + 1), GFP_KERNEL);
969 if (dst == NULL)
970 return ERR_PTR(-ENOMEM);
971
972 memcpy(dst, src, len);
973 dst[len] = '\0';
974
975 return dst;
976 }
977
978 static int get_option_ul(substring_t args[], unsigned long *option)
979 {
980 int rc;
981 char *string;
982
983 string = match_strdup(args);
984 if (string == NULL)
985 return -ENOMEM;
986 rc = kstrtoul(string, 0, option);
987 kfree(string);
988
989 return rc;
990 }
991
992 static int get_option_uid(substring_t args[], kuid_t *result)
993 {
994 unsigned long value;
995 kuid_t uid;
996 int rc;
997
998 rc = get_option_ul(args, &value);
999 if (rc)
1000 return rc;
1001
1002 uid = make_kuid(current_user_ns(), value);
1003 if (!uid_valid(uid))
1004 return -EINVAL;
1005
1006 *result = uid;
1007 return 0;
1008 }
1009
1010 static int get_option_gid(substring_t args[], kgid_t *result)
1011 {
1012 unsigned long value;
1013 kgid_t gid;
1014 int rc;
1015
1016 rc = get_option_ul(args, &value);
1017 if (rc)
1018 return rc;
1019
1020 gid = make_kgid(current_user_ns(), value);
1021 if (!gid_valid(gid))
1022 return -EINVAL;
1023
1024 *result = gid;
1025 return 0;
1026 }
1027
1028 static int cifs_parse_security_flavors(char *value,
1029 struct smb_vol *vol)
1030 {
1031
1032 substring_t args[MAX_OPT_ARGS];
1033
1034 switch (match_token(value, cifs_secflavor_tokens, args)) {
1035 case Opt_sec_krb5:
1036 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN;
1037 break;
1038 case Opt_sec_krb5i:
1039 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1040 break;
1041 case Opt_sec_krb5p:
1042 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1043 cifs_dbg(VFS, "Krb5 cifs privacy not supported\n");
1044 break;
1045 case Opt_sec_ntlmssp:
1046 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1047 break;
1048 case Opt_sec_ntlmsspi:
1049 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1050 break;
1051 case Opt_ntlm:
1052 /* ntlm is default so can be turned off too */
1053 vol->secFlg |= CIFSSEC_MAY_NTLM;
1054 break;
1055 case Opt_sec_ntlmi:
1056 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1057 break;
1058 case Opt_sec_ntlmv2:
1059 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1060 break;
1061 case Opt_sec_ntlmv2i:
1062 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1063 break;
1064 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1065 case Opt_sec_lanman:
1066 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1067 break;
1068 #endif
1069 case Opt_sec_none:
1070 vol->nullauth = 1;
1071 vol->secFlg |= CIFSSEC_MAY_NTLM;
1072 break;
1073 default:
1074 cifs_dbg(VFS, "bad security option: %s\n", value);
1075 return 1;
1076 }
1077
1078 return 0;
1079 }
1080
1081 static int
1082 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1083 {
1084 substring_t args[MAX_OPT_ARGS];
1085
1086 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1087 case Opt_cache_loose:
1088 vol->direct_io = false;
1089 vol->strict_io = false;
1090 break;
1091 case Opt_cache_strict:
1092 vol->direct_io = false;
1093 vol->strict_io = true;
1094 break;
1095 case Opt_cache_none:
1096 vol->direct_io = true;
1097 vol->strict_io = false;
1098 break;
1099 default:
1100 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1101 return 1;
1102 }
1103 return 0;
1104 }
1105
1106 static int
1107 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1108 {
1109 substring_t args[MAX_OPT_ARGS];
1110
1111 switch (match_token(value, cifs_smb_version_tokens, args)) {
1112 case Smb_1:
1113 vol->ops = &smb1_operations;
1114 vol->vals = &smb1_values;
1115 break;
1116 #ifdef CONFIG_CIFS_SMB2
1117 case Smb_20:
1118 vol->ops = &smb21_operations; /* currently identical with 2.1 */
1119 vol->vals = &smb20_values;
1120 break;
1121 case Smb_21:
1122 vol->ops = &smb21_operations;
1123 vol->vals = &smb21_values;
1124 break;
1125 case Smb_30:
1126 vol->ops = &smb30_operations;
1127 vol->vals = &smb30_values;
1128 break;
1129 #endif
1130 default:
1131 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1132 return 1;
1133 }
1134 return 0;
1135 }
1136
1137 /*
1138 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1139 * fields with the result. Returns 0 on success and an error otherwise.
1140 */
1141 static int
1142 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1143 {
1144 char *pos;
1145 const char *delims = "/\\";
1146 size_t len;
1147
1148 /* make sure we have a valid UNC double delimiter prefix */
1149 len = strspn(devname, delims);
1150 if (len != 2)
1151 return -EINVAL;
1152
1153 /* find delimiter between host and sharename */
1154 pos = strpbrk(devname + 2, delims);
1155 if (!pos)
1156 return -EINVAL;
1157
1158 /* skip past delimiter */
1159 ++pos;
1160
1161 /* now go until next delimiter or end of string */
1162 len = strcspn(pos, delims);
1163
1164 /* move "pos" up to delimiter or NULL */
1165 pos += len;
1166 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1167 if (!vol->UNC)
1168 return -ENOMEM;
1169
1170 convert_delimiter(vol->UNC, '\\');
1171
1172 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1173 if (!*pos++ || !*pos)
1174 return 0;
1175
1176 vol->prepath = kstrdup(pos, GFP_KERNEL);
1177 if (!vol->prepath)
1178 return -ENOMEM;
1179
1180 return 0;
1181 }
1182
1183 static int
1184 cifs_parse_mount_options(const char *mountdata, const char *devname,
1185 struct smb_vol *vol)
1186 {
1187 char *data, *end;
1188 char *mountdata_copy = NULL, *options;
1189 unsigned int temp_len, i, j;
1190 char separator[2];
1191 short int override_uid = -1;
1192 short int override_gid = -1;
1193 bool uid_specified = false;
1194 bool gid_specified = false;
1195 bool sloppy = false;
1196 char *invalid = NULL;
1197 char *nodename = utsname()->nodename;
1198 char *string = NULL;
1199 char *tmp_end, *value;
1200 char delim;
1201 bool got_ip = false;
1202 unsigned short port = 0;
1203 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1204
1205 separator[0] = ',';
1206 separator[1] = 0;
1207 delim = separator[0];
1208
1209 /* ensure we always start with zeroed-out smb_vol */
1210 memset(vol, 0, sizeof(*vol));
1211
1212 /*
1213 * does not have to be perfect mapping since field is
1214 * informational, only used for servers that do not support
1215 * port 445 and it can be overridden at mount time
1216 */
1217 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1218 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1219 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1220
1221 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1222 /* null target name indicates to use *SMBSERVR default called name
1223 if we end up sending RFC1001 session initialize */
1224 vol->target_rfc1001_name[0] = 0;
1225 vol->cred_uid = current_uid();
1226 vol->linux_uid = current_uid();
1227 vol->linux_gid = current_gid();
1228
1229 /* default to only allowing write access to owner of the mount */
1230 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1231
1232 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1233 /* default is always to request posix paths. */
1234 vol->posix_paths = 1;
1235 /* default to using server inode numbers where available */
1236 vol->server_ino = 1;
1237
1238 /* default is to use strict cifs caching semantics */
1239 vol->strict_io = true;
1240
1241 vol->actimeo = CIFS_DEF_ACTIMEO;
1242
1243 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1244 vol->ops = &smb1_operations;
1245 vol->vals = &smb1_values;
1246
1247 if (!mountdata)
1248 goto cifs_parse_mount_err;
1249
1250 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1251 if (!mountdata_copy)
1252 goto cifs_parse_mount_err;
1253
1254 options = mountdata_copy;
1255 end = options + strlen(options);
1256
1257 if (strncmp(options, "sep=", 4) == 0) {
1258 if (options[4] != 0) {
1259 separator[0] = options[4];
1260 options += 5;
1261 } else {
1262 cifs_dbg(FYI, "Null separator not allowed\n");
1263 }
1264 }
1265 vol->backupuid_specified = false; /* no backup intent for a user */
1266 vol->backupgid_specified = false; /* no backup intent for a group */
1267
1268 switch (cifs_parse_devname(devname, vol)) {
1269 case 0:
1270 break;
1271 case -ENOMEM:
1272 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1273 goto cifs_parse_mount_err;
1274 case -EINVAL:
1275 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1276 goto cifs_parse_mount_err;
1277 default:
1278 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1279 goto cifs_parse_mount_err;
1280 }
1281
1282 while ((data = strsep(&options, separator)) != NULL) {
1283 substring_t args[MAX_OPT_ARGS];
1284 unsigned long option;
1285 int token;
1286
1287 if (!*data)
1288 continue;
1289
1290 token = match_token(data, cifs_mount_option_tokens, args);
1291
1292 switch (token) {
1293
1294 /* Ingnore the following */
1295 case Opt_ignore:
1296 break;
1297
1298 /* Boolean values */
1299 case Opt_user_xattr:
1300 vol->no_xattr = 0;
1301 break;
1302 case Opt_nouser_xattr:
1303 vol->no_xattr = 1;
1304 break;
1305 case Opt_forceuid:
1306 override_uid = 1;
1307 break;
1308 case Opt_noforceuid:
1309 override_uid = 0;
1310 break;
1311 case Opt_forcegid:
1312 override_gid = 1;
1313 break;
1314 case Opt_noforcegid:
1315 override_gid = 0;
1316 break;
1317 case Opt_noblocksend:
1318 vol->noblocksnd = 1;
1319 break;
1320 case Opt_noautotune:
1321 vol->noautotune = 1;
1322 break;
1323 case Opt_hard:
1324 vol->retry = 1;
1325 break;
1326 case Opt_soft:
1327 vol->retry = 0;
1328 break;
1329 case Opt_perm:
1330 vol->noperm = 0;
1331 break;
1332 case Opt_noperm:
1333 vol->noperm = 1;
1334 break;
1335 case Opt_mapchars:
1336 vol->remap = 1;
1337 break;
1338 case Opt_nomapchars:
1339 vol->remap = 0;
1340 break;
1341 case Opt_sfu:
1342 vol->sfu_emul = 1;
1343 break;
1344 case Opt_nosfu:
1345 vol->sfu_emul = 0;
1346 break;
1347 case Opt_nodfs:
1348 vol->nodfs = 1;
1349 break;
1350 case Opt_posixpaths:
1351 vol->posix_paths = 1;
1352 break;
1353 case Opt_noposixpaths:
1354 vol->posix_paths = 0;
1355 break;
1356 case Opt_nounix:
1357 vol->no_linux_ext = 1;
1358 break;
1359 case Opt_nocase:
1360 vol->nocase = 1;
1361 break;
1362 case Opt_brl:
1363 vol->nobrl = 0;
1364 break;
1365 case Opt_nobrl:
1366 vol->nobrl = 1;
1367 /*
1368 * turn off mandatory locking in mode
1369 * if remote locking is turned off since the
1370 * local vfs will do advisory
1371 */
1372 if (vol->file_mode ==
1373 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1374 vol->file_mode = S_IALLUGO;
1375 break;
1376 case Opt_forcemandatorylock:
1377 vol->mand_lock = 1;
1378 break;
1379 case Opt_setuids:
1380 vol->setuids = 1;
1381 break;
1382 case Opt_nosetuids:
1383 vol->setuids = 0;
1384 break;
1385 case Opt_dynperm:
1386 vol->dynperm = true;
1387 break;
1388 case Opt_nodynperm:
1389 vol->dynperm = false;
1390 break;
1391 case Opt_nohard:
1392 vol->retry = 0;
1393 break;
1394 case Opt_nosoft:
1395 vol->retry = 1;
1396 break;
1397 case Opt_nointr:
1398 vol->intr = 0;
1399 break;
1400 case Opt_intr:
1401 vol->intr = 1;
1402 break;
1403 case Opt_nostrictsync:
1404 vol->nostrictsync = 1;
1405 break;
1406 case Opt_strictsync:
1407 vol->nostrictsync = 0;
1408 break;
1409 case Opt_serverino:
1410 vol->server_ino = 1;
1411 break;
1412 case Opt_noserverino:
1413 vol->server_ino = 0;
1414 break;
1415 case Opt_rwpidforward:
1416 vol->rwpidforward = 1;
1417 break;
1418 case Opt_cifsacl:
1419 vol->cifs_acl = 1;
1420 break;
1421 case Opt_nocifsacl:
1422 vol->cifs_acl = 0;
1423 break;
1424 case Opt_acl:
1425 vol->no_psx_acl = 0;
1426 break;
1427 case Opt_noacl:
1428 vol->no_psx_acl = 1;
1429 break;
1430 case Opt_locallease:
1431 vol->local_lease = 1;
1432 break;
1433 case Opt_sign:
1434 vol->secFlg |= CIFSSEC_MUST_SIGN;
1435 break;
1436 case Opt_seal:
1437 /* we do not do the following in secFlags because seal
1438 * is a per tree connection (mount) not a per socket
1439 * or per-smb connection option in the protocol
1440 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1441 */
1442 vol->seal = 1;
1443 break;
1444 case Opt_noac:
1445 printk(KERN_WARNING "CIFS: Mount option noac not "
1446 "supported. Instead set "
1447 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1448 break;
1449 case Opt_fsc:
1450 #ifndef CONFIG_CIFS_FSCACHE
1451 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1452 goto cifs_parse_mount_err;
1453 #endif
1454 vol->fsc = true;
1455 break;
1456 case Opt_mfsymlinks:
1457 vol->mfsymlinks = true;
1458 break;
1459 case Opt_multiuser:
1460 vol->multiuser = true;
1461 break;
1462 case Opt_sloppy:
1463 sloppy = true;
1464 break;
1465
1466 /* Numeric Values */
1467 case Opt_backupuid:
1468 if (get_option_uid(args, &vol->backupuid)) {
1469 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1470 __func__);
1471 goto cifs_parse_mount_err;
1472 }
1473 vol->backupuid_specified = true;
1474 break;
1475 case Opt_backupgid:
1476 if (get_option_gid(args, &vol->backupgid)) {
1477 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1478 __func__);
1479 goto cifs_parse_mount_err;
1480 }
1481 vol->backupgid_specified = true;
1482 break;
1483 case Opt_uid:
1484 if (get_option_uid(args, &vol->linux_uid)) {
1485 cifs_dbg(VFS, "%s: Invalid uid value\n",
1486 __func__);
1487 goto cifs_parse_mount_err;
1488 }
1489 uid_specified = true;
1490 break;
1491 case Opt_cruid:
1492 if (get_option_uid(args, &vol->cred_uid)) {
1493 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1494 __func__);
1495 goto cifs_parse_mount_err;
1496 }
1497 break;
1498 case Opt_gid:
1499 if (get_option_gid(args, &vol->linux_gid)) {
1500 cifs_dbg(VFS, "%s: Invalid gid value\n",
1501 __func__);
1502 goto cifs_parse_mount_err;
1503 }
1504 gid_specified = true;
1505 break;
1506 case Opt_file_mode:
1507 if (get_option_ul(args, &option)) {
1508 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1509 __func__);
1510 goto cifs_parse_mount_err;
1511 }
1512 vol->file_mode = option;
1513 break;
1514 case Opt_dirmode:
1515 if (get_option_ul(args, &option)) {
1516 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1517 __func__);
1518 goto cifs_parse_mount_err;
1519 }
1520 vol->dir_mode = option;
1521 break;
1522 case Opt_port:
1523 if (get_option_ul(args, &option) ||
1524 option > USHRT_MAX) {
1525 cifs_dbg(VFS, "%s: Invalid port value\n",
1526 __func__);
1527 goto cifs_parse_mount_err;
1528 }
1529 port = (unsigned short)option;
1530 break;
1531 case Opt_rsize:
1532 if (get_option_ul(args, &option)) {
1533 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 vol->rsize = option;
1538 break;
1539 case Opt_wsize:
1540 if (get_option_ul(args, &option)) {
1541 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 vol->wsize = option;
1546 break;
1547 case Opt_actimeo:
1548 if (get_option_ul(args, &option)) {
1549 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1550 __func__);
1551 goto cifs_parse_mount_err;
1552 }
1553 vol->actimeo = HZ * option;
1554 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1555 cifs_dbg(VFS, "attribute cache timeout too large\n");
1556 goto cifs_parse_mount_err;
1557 }
1558 break;
1559
1560 /* String Arguments */
1561
1562 case Opt_blank_user:
1563 /* null user, ie. anonymous authentication */
1564 vol->nullauth = 1;
1565 vol->username = NULL;
1566 break;
1567 case Opt_user:
1568 string = match_strdup(args);
1569 if (string == NULL)
1570 goto out_nomem;
1571
1572 if (strnlen(string, MAX_USERNAME_SIZE) >
1573 MAX_USERNAME_SIZE) {
1574 printk(KERN_WARNING "CIFS: username too long\n");
1575 goto cifs_parse_mount_err;
1576 }
1577 vol->username = kstrdup(string, GFP_KERNEL);
1578 if (!vol->username)
1579 goto cifs_parse_mount_err;
1580 break;
1581 case Opt_blank_pass:
1582 /* passwords have to be handled differently
1583 * to allow the character used for deliminator
1584 * to be passed within them
1585 */
1586
1587 /*
1588 * Check if this is a case where the password
1589 * starts with a delimiter
1590 */
1591 tmp_end = strchr(data, '=');
1592 tmp_end++;
1593 if (!(tmp_end < end && tmp_end[1] == delim)) {
1594 /* No it is not. Set the password to NULL */
1595 vol->password = NULL;
1596 break;
1597 }
1598 /* Yes it is. Drop down to Opt_pass below.*/
1599 case Opt_pass:
1600 /* Obtain the value string */
1601 value = strchr(data, '=');
1602 value++;
1603
1604 /* Set tmp_end to end of the string */
1605 tmp_end = (char *) value + strlen(value);
1606
1607 /* Check if following character is the deliminator
1608 * If yes, we have encountered a double deliminator
1609 * reset the NULL character to the deliminator
1610 */
1611 if (tmp_end < end && tmp_end[1] == delim) {
1612 tmp_end[0] = delim;
1613
1614 /* Keep iterating until we get to a single
1615 * deliminator OR the end
1616 */
1617 while ((tmp_end = strchr(tmp_end, delim))
1618 != NULL && (tmp_end[1] == delim)) {
1619 tmp_end = (char *) &tmp_end[2];
1620 }
1621
1622 /* Reset var options to point to next element */
1623 if (tmp_end) {
1624 tmp_end[0] = '\0';
1625 options = (char *) &tmp_end[1];
1626 } else
1627 /* Reached the end of the mount option
1628 * string */
1629 options = end;
1630 }
1631
1632 /* Now build new password string */
1633 temp_len = strlen(value);
1634 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1635 if (vol->password == NULL) {
1636 printk(KERN_WARNING "CIFS: no memory "
1637 "for password\n");
1638 goto cifs_parse_mount_err;
1639 }
1640
1641 for (i = 0, j = 0; i < temp_len; i++, j++) {
1642 vol->password[j] = value[i];
1643 if ((value[i] == delim) &&
1644 value[i+1] == delim)
1645 /* skip the second deliminator */
1646 i++;
1647 }
1648 vol->password[j] = '\0';
1649 break;
1650 case Opt_blank_ip:
1651 /* FIXME: should this be an error instead? */
1652 got_ip = false;
1653 break;
1654 case Opt_ip:
1655 string = match_strdup(args);
1656 if (string == NULL)
1657 goto out_nomem;
1658
1659 if (!cifs_convert_address(dstaddr, string,
1660 strlen(string))) {
1661 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1662 string);
1663 goto cifs_parse_mount_err;
1664 }
1665 got_ip = true;
1666 break;
1667 case Opt_domain:
1668 string = match_strdup(args);
1669 if (string == NULL)
1670 goto out_nomem;
1671
1672 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1673 == CIFS_MAX_DOMAINNAME_LEN) {
1674 printk(KERN_WARNING "CIFS: domain name too"
1675 " long\n");
1676 goto cifs_parse_mount_err;
1677 }
1678
1679 vol->domainname = kstrdup(string, GFP_KERNEL);
1680 if (!vol->domainname) {
1681 printk(KERN_WARNING "CIFS: no memory "
1682 "for domainname\n");
1683 goto cifs_parse_mount_err;
1684 }
1685 cifs_dbg(FYI, "Domain name set\n");
1686 break;
1687 case Opt_srcaddr:
1688 string = match_strdup(args);
1689 if (string == NULL)
1690 goto out_nomem;
1691
1692 if (!cifs_convert_address(
1693 (struct sockaddr *)&vol->srcaddr,
1694 string, strlen(string))) {
1695 printk(KERN_WARNING "CIFS: Could not parse"
1696 " srcaddr: %s\n", string);
1697 goto cifs_parse_mount_err;
1698 }
1699 break;
1700 case Opt_iocharset:
1701 string = match_strdup(args);
1702 if (string == NULL)
1703 goto out_nomem;
1704
1705 if (strnlen(string, 1024) >= 65) {
1706 printk(KERN_WARNING "CIFS: iocharset name "
1707 "too long.\n");
1708 goto cifs_parse_mount_err;
1709 }
1710
1711 if (strnicmp(string, "default", 7) != 0) {
1712 vol->iocharset = kstrdup(string,
1713 GFP_KERNEL);
1714 if (!vol->iocharset) {
1715 printk(KERN_WARNING "CIFS: no memory"
1716 "for charset\n");
1717 goto cifs_parse_mount_err;
1718 }
1719 }
1720 /* if iocharset not set then load_nls_default
1721 * is used by caller
1722 */
1723 cifs_dbg(FYI, "iocharset set to %s\n", string);
1724 break;
1725 case Opt_netbiosname:
1726 string = match_strdup(args);
1727 if (string == NULL)
1728 goto out_nomem;
1729
1730 memset(vol->source_rfc1001_name, 0x20,
1731 RFC1001_NAME_LEN);
1732 /*
1733 * FIXME: are there cases in which a comma can
1734 * be valid in workstation netbios name (and
1735 * need special handling)?
1736 */
1737 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1738 /* don't ucase netbiosname for user */
1739 if (string[i] == 0)
1740 break;
1741 vol->source_rfc1001_name[i] = string[i];
1742 }
1743 /* The string has 16th byte zero still from
1744 * set at top of the function
1745 */
1746 if (i == RFC1001_NAME_LEN && string[i] != 0)
1747 printk(KERN_WARNING "CIFS: netbiosname"
1748 " longer than 15 truncated.\n");
1749
1750 break;
1751 case Opt_servern:
1752 /* servernetbiosname specified override *SMBSERVER */
1753 string = match_strdup(args);
1754 if (string == NULL)
1755 goto out_nomem;
1756
1757 /* last byte, type, is 0x20 for servr type */
1758 memset(vol->target_rfc1001_name, 0x20,
1759 RFC1001_NAME_LEN_WITH_NULL);
1760
1761 /* BB are there cases in which a comma can be
1762 valid in this workstation netbios name
1763 (and need special handling)? */
1764
1765 /* user or mount helper must uppercase the
1766 netbios name */
1767 for (i = 0; i < 15; i++) {
1768 if (string[i] == 0)
1769 break;
1770 vol->target_rfc1001_name[i] = string[i];
1771 }
1772 /* The string has 16th byte zero still from
1773 set at top of the function */
1774 if (i == RFC1001_NAME_LEN && string[i] != 0)
1775 printk(KERN_WARNING "CIFS: server net"
1776 "biosname longer than 15 truncated.\n");
1777 break;
1778 case Opt_ver:
1779 string = match_strdup(args);
1780 if (string == NULL)
1781 goto out_nomem;
1782
1783 if (strnicmp(string, "1", 1) == 0) {
1784 /* This is the default */
1785 break;
1786 }
1787 /* For all other value, error */
1788 printk(KERN_WARNING "CIFS: Invalid version"
1789 " specified\n");
1790 goto cifs_parse_mount_err;
1791 case Opt_vers:
1792 string = match_strdup(args);
1793 if (string == NULL)
1794 goto out_nomem;
1795
1796 if (cifs_parse_smb_version(string, vol) != 0)
1797 goto cifs_parse_mount_err;
1798 break;
1799 case Opt_sec:
1800 string = match_strdup(args);
1801 if (string == NULL)
1802 goto out_nomem;
1803
1804 if (cifs_parse_security_flavors(string, vol) != 0)
1805 goto cifs_parse_mount_err;
1806 break;
1807 case Opt_cache:
1808 string = match_strdup(args);
1809 if (string == NULL)
1810 goto out_nomem;
1811
1812 if (cifs_parse_cache_flavor(string, vol) != 0)
1813 goto cifs_parse_mount_err;
1814 break;
1815 default:
1816 /*
1817 * An option we don't recognize. Save it off for later
1818 * if we haven't already found one
1819 */
1820 if (!invalid)
1821 invalid = data;
1822 break;
1823 }
1824 /* Free up any allocated string */
1825 kfree(string);
1826 string = NULL;
1827 }
1828
1829 if (!sloppy && invalid) {
1830 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1831 goto cifs_parse_mount_err;
1832 }
1833
1834 #ifndef CONFIG_KEYS
1835 /* Muliuser mounts require CONFIG_KEYS support */
1836 if (vol->multiuser) {
1837 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1838 goto cifs_parse_mount_err;
1839 }
1840 #endif
1841 if (!vol->UNC) {
1842 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1843 goto cifs_parse_mount_err;
1844 }
1845
1846 /* make sure UNC has a share name */
1847 if (!strchr(vol->UNC + 3, '\\')) {
1848 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1849 goto cifs_parse_mount_err;
1850 }
1851
1852 if (!got_ip) {
1853 /* No ip= option specified? Try to get it from UNC */
1854 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1855 strlen(&vol->UNC[2]))) {
1856 printk(KERN_ERR "Unable to determine destination "
1857 "address.\n");
1858 goto cifs_parse_mount_err;
1859 }
1860 }
1861
1862 /* set the port that we got earlier */
1863 cifs_set_port(dstaddr, port);
1864
1865 if (uid_specified)
1866 vol->override_uid = override_uid;
1867 else if (override_uid == 1)
1868 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1869 "specified with no uid= option.\n");
1870
1871 if (gid_specified)
1872 vol->override_gid = override_gid;
1873 else if (override_gid == 1)
1874 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1875 "specified with no gid= option.\n");
1876
1877 kfree(mountdata_copy);
1878 return 0;
1879
1880 out_nomem:
1881 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1882 cifs_parse_mount_err:
1883 kfree(string);
1884 kfree(mountdata_copy);
1885 return 1;
1886 }
1887
1888 /** Returns true if srcaddr isn't specified and rhs isn't
1889 * specified, or if srcaddr is specified and
1890 * matches the IP address of the rhs argument.
1891 */
1892 static bool
1893 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1894 {
1895 switch (srcaddr->sa_family) {
1896 case AF_UNSPEC:
1897 return (rhs->sa_family == AF_UNSPEC);
1898 case AF_INET: {
1899 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1900 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1901 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1902 }
1903 case AF_INET6: {
1904 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1905 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1906 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1907 }
1908 default:
1909 WARN_ON(1);
1910 return false; /* don't expect to be here */
1911 }
1912 }
1913
1914 /*
1915 * If no port is specified in addr structure, we try to match with 445 port
1916 * and if it fails - with 139 ports. It should be called only if address
1917 * families of server and addr are equal.
1918 */
1919 static bool
1920 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1921 {
1922 __be16 port, *sport;
1923
1924 switch (addr->sa_family) {
1925 case AF_INET:
1926 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1927 port = ((struct sockaddr_in *) addr)->sin_port;
1928 break;
1929 case AF_INET6:
1930 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1931 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1932 break;
1933 default:
1934 WARN_ON(1);
1935 return false;
1936 }
1937
1938 if (!port) {
1939 port = htons(CIFS_PORT);
1940 if (port == *sport)
1941 return true;
1942
1943 port = htons(RFC1001_PORT);
1944 }
1945
1946 return port == *sport;
1947 }
1948
1949 static bool
1950 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1951 struct sockaddr *srcaddr)
1952 {
1953 switch (addr->sa_family) {
1954 case AF_INET: {
1955 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1956 struct sockaddr_in *srv_addr4 =
1957 (struct sockaddr_in *)&server->dstaddr;
1958
1959 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1960 return false;
1961 break;
1962 }
1963 case AF_INET6: {
1964 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1965 struct sockaddr_in6 *srv_addr6 =
1966 (struct sockaddr_in6 *)&server->dstaddr;
1967
1968 if (!ipv6_addr_equal(&addr6->sin6_addr,
1969 &srv_addr6->sin6_addr))
1970 return false;
1971 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1972 return false;
1973 break;
1974 }
1975 default:
1976 WARN_ON(1);
1977 return false; /* don't expect to be here */
1978 }
1979
1980 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1981 return false;
1982
1983 return true;
1984 }
1985
1986 static bool
1987 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1988 {
1989 unsigned int secFlags;
1990
1991 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1992 secFlags = vol->secFlg;
1993 else
1994 secFlags = global_secflags | vol->secFlg;
1995
1996 switch (server->secType) {
1997 case LANMAN:
1998 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1999 return false;
2000 break;
2001 case NTLMv2:
2002 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
2003 return false;
2004 break;
2005 case NTLM:
2006 if (!(secFlags & CIFSSEC_MAY_NTLM))
2007 return false;
2008 break;
2009 case Kerberos:
2010 if (!(secFlags & CIFSSEC_MAY_KRB5))
2011 return false;
2012 break;
2013 case RawNTLMSSP:
2014 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2015 return false;
2016 break;
2017 default:
2018 /* shouldn't happen */
2019 return false;
2020 }
2021
2022 /* now check if signing mode is acceptable */
2023 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2024 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2025 return false;
2026 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2027 (server->sec_mode &
2028 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2029 return false;
2030
2031 return true;
2032 }
2033
2034 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2035 {
2036 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2037
2038 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2039 return 0;
2040
2041 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2042 return 0;
2043
2044 if (!match_address(server, addr,
2045 (struct sockaddr *)&vol->srcaddr))
2046 return 0;
2047
2048 if (!match_port(server, addr))
2049 return 0;
2050
2051 if (!match_security(server, vol))
2052 return 0;
2053
2054 return 1;
2055 }
2056
2057 static struct TCP_Server_Info *
2058 cifs_find_tcp_session(struct smb_vol *vol)
2059 {
2060 struct TCP_Server_Info *server;
2061
2062 spin_lock(&cifs_tcp_ses_lock);
2063 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2064 if (!match_server(server, vol))
2065 continue;
2066
2067 ++server->srv_count;
2068 spin_unlock(&cifs_tcp_ses_lock);
2069 cifs_dbg(FYI, "Existing tcp session with server found\n");
2070 return server;
2071 }
2072 spin_unlock(&cifs_tcp_ses_lock);
2073 return NULL;
2074 }
2075
2076 void
2077 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2078 {
2079 struct task_struct *task;
2080
2081 spin_lock(&cifs_tcp_ses_lock);
2082 if (--server->srv_count > 0) {
2083 spin_unlock(&cifs_tcp_ses_lock);
2084 return;
2085 }
2086
2087 put_net(cifs_net_ns(server));
2088
2089 list_del_init(&server->tcp_ses_list);
2090 spin_unlock(&cifs_tcp_ses_lock);
2091
2092 cancel_delayed_work_sync(&server->echo);
2093
2094 #ifdef CONFIG_CIFS_SMB2
2095 if (from_reconnect)
2096 /*
2097 * Avoid deadlock here: reconnect work calls
2098 * cifs_put_tcp_session() at its end. Need to be sure
2099 * that reconnect work does nothing with server pointer after
2100 * that step.
2101 */
2102 cancel_delayed_work(&server->reconnect);
2103 else
2104 cancel_delayed_work_sync(&server->reconnect);
2105 #endif
2106
2107 spin_lock(&GlobalMid_Lock);
2108 server->tcpStatus = CifsExiting;
2109 spin_unlock(&GlobalMid_Lock);
2110
2111 cifs_crypto_shash_release(server);
2112 cifs_fscache_release_client_cookie(server);
2113
2114 kfree(server->session_key.response);
2115 server->session_key.response = NULL;
2116 server->session_key.len = 0;
2117
2118 task = xchg(&server->tsk, NULL);
2119 if (task)
2120 force_sig(SIGKILL, task);
2121 }
2122
2123 static struct TCP_Server_Info *
2124 cifs_get_tcp_session(struct smb_vol *volume_info)
2125 {
2126 struct TCP_Server_Info *tcp_ses = NULL;
2127 int rc;
2128
2129 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2130
2131 /* see if we already have a matching tcp_ses */
2132 tcp_ses = cifs_find_tcp_session(volume_info);
2133 if (tcp_ses)
2134 return tcp_ses;
2135
2136 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2137 if (!tcp_ses) {
2138 rc = -ENOMEM;
2139 goto out_err;
2140 }
2141
2142 rc = cifs_crypto_shash_allocate(tcp_ses);
2143 if (rc) {
2144 cifs_dbg(VFS, "could not setup hash structures rc %d\n", rc);
2145 goto out_err;
2146 }
2147
2148 tcp_ses->ops = volume_info->ops;
2149 tcp_ses->vals = volume_info->vals;
2150 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2151 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2152 if (IS_ERR(tcp_ses->hostname)) {
2153 rc = PTR_ERR(tcp_ses->hostname);
2154 goto out_err_crypto_release;
2155 }
2156
2157 tcp_ses->noblocksnd = volume_info->noblocksnd;
2158 tcp_ses->noautotune = volume_info->noautotune;
2159 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2160 tcp_ses->in_flight = 0;
2161 tcp_ses->credits = 1;
2162 init_waitqueue_head(&tcp_ses->response_q);
2163 init_waitqueue_head(&tcp_ses->request_q);
2164 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2165 mutex_init(&tcp_ses->srv_mutex);
2166 memcpy(tcp_ses->workstation_RFC1001_name,
2167 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2168 memcpy(tcp_ses->server_RFC1001_name,
2169 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2170 tcp_ses->session_estab = false;
2171 tcp_ses->sequence_number = 0;
2172 tcp_ses->lstrp = jiffies;
2173 spin_lock_init(&tcp_ses->req_lock);
2174 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2175 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2176 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2177 #ifdef CONFIG_CIFS_SMB2
2178 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2179 mutex_init(&tcp_ses->reconnect_mutex);
2180 #endif
2181 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2182 sizeof(tcp_ses->srcaddr));
2183 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2184 sizeof(tcp_ses->dstaddr));
2185 /*
2186 * at this point we are the only ones with the pointer
2187 * to the struct since the kernel thread not created yet
2188 * no need to spinlock this init of tcpStatus or srv_count
2189 */
2190 tcp_ses->tcpStatus = CifsNew;
2191 ++tcp_ses->srv_count;
2192
2193 rc = ip_connect(tcp_ses);
2194 if (rc < 0) {
2195 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2196 goto out_err_crypto_release;
2197 }
2198
2199 /*
2200 * since we're in a cifs function already, we know that
2201 * this will succeed. No need for try_module_get().
2202 */
2203 __module_get(THIS_MODULE);
2204 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2205 tcp_ses, "cifsd");
2206 if (IS_ERR(tcp_ses->tsk)) {
2207 rc = PTR_ERR(tcp_ses->tsk);
2208 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2209 module_put(THIS_MODULE);
2210 goto out_err_crypto_release;
2211 }
2212 tcp_ses->tcpStatus = CifsNeedNegotiate;
2213
2214 /* thread spawned, put it on the list */
2215 spin_lock(&cifs_tcp_ses_lock);
2216 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2217 spin_unlock(&cifs_tcp_ses_lock);
2218
2219 cifs_fscache_get_client_cookie(tcp_ses);
2220
2221 /* queue echo request delayed work */
2222 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2223
2224 return tcp_ses;
2225
2226 out_err_crypto_release:
2227 cifs_crypto_shash_release(tcp_ses);
2228
2229 put_net(cifs_net_ns(tcp_ses));
2230
2231 out_err:
2232 if (tcp_ses) {
2233 if (!IS_ERR(tcp_ses->hostname))
2234 kfree(tcp_ses->hostname);
2235 if (tcp_ses->ssocket)
2236 sock_release(tcp_ses->ssocket);
2237 kfree(tcp_ses);
2238 }
2239 return ERR_PTR(rc);
2240 }
2241
2242 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2243 {
2244 switch (ses->server->secType) {
2245 case Kerberos:
2246 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2247 return 0;
2248 break;
2249 default:
2250 /* NULL username means anonymous session */
2251 if (ses->user_name == NULL) {
2252 if (!vol->nullauth)
2253 return 0;
2254 break;
2255 }
2256
2257 /* anything else takes username/password */
2258 if (strncmp(ses->user_name,
2259 vol->username ? vol->username : "",
2260 MAX_USERNAME_SIZE))
2261 return 0;
2262 if (strlen(vol->username) != 0 &&
2263 ses->password != NULL &&
2264 strncmp(ses->password,
2265 vol->password ? vol->password : "",
2266 MAX_PASSWORD_SIZE))
2267 return 0;
2268 }
2269 return 1;
2270 }
2271
2272 static struct cifs_ses *
2273 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2274 {
2275 struct cifs_ses *ses;
2276
2277 spin_lock(&cifs_tcp_ses_lock);
2278 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2279 if (!match_session(ses, vol))
2280 continue;
2281 ++ses->ses_count;
2282 spin_unlock(&cifs_tcp_ses_lock);
2283 return ses;
2284 }
2285 spin_unlock(&cifs_tcp_ses_lock);
2286 return NULL;
2287 }
2288
2289 static void
2290 cifs_put_smb_ses(struct cifs_ses *ses)
2291 {
2292 unsigned int xid;
2293 struct TCP_Server_Info *server = ses->server;
2294
2295 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2296 spin_lock(&cifs_tcp_ses_lock);
2297 if (--ses->ses_count > 0) {
2298 spin_unlock(&cifs_tcp_ses_lock);
2299 return;
2300 }
2301
2302 list_del_init(&ses->smb_ses_list);
2303 spin_unlock(&cifs_tcp_ses_lock);
2304
2305 if (ses->status == CifsGood && server->ops->logoff) {
2306 xid = get_xid();
2307 server->ops->logoff(xid, ses);
2308 _free_xid(xid);
2309 }
2310 sesInfoFree(ses);
2311 cifs_put_tcp_session(server, 0);
2312 }
2313
2314 #ifdef CONFIG_KEYS
2315
2316 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2317 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2318
2319 /* Populate username and pw fields from keyring if possible */
2320 static int
2321 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2322 {
2323 int rc = 0;
2324 char *desc, *delim, *payload;
2325 ssize_t len;
2326 struct key *key;
2327 struct TCP_Server_Info *server = ses->server;
2328 struct sockaddr_in *sa;
2329 struct sockaddr_in6 *sa6;
2330 struct user_key_payload *upayload;
2331
2332 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2333 if (!desc)
2334 return -ENOMEM;
2335
2336 /* try to find an address key first */
2337 switch (server->dstaddr.ss_family) {
2338 case AF_INET:
2339 sa = (struct sockaddr_in *)&server->dstaddr;
2340 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2341 break;
2342 case AF_INET6:
2343 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2344 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2345 break;
2346 default:
2347 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2348 server->dstaddr.ss_family);
2349 rc = -EINVAL;
2350 goto out_err;
2351 }
2352
2353 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2354 key = request_key(&key_type_logon, desc, "");
2355 if (IS_ERR(key)) {
2356 if (!ses->domainName) {
2357 cifs_dbg(FYI, "domainName is NULL\n");
2358 rc = PTR_ERR(key);
2359 goto out_err;
2360 }
2361
2362 /* didn't work, try to find a domain key */
2363 sprintf(desc, "cifs:d:%s", ses->domainName);
2364 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2365 key = request_key(&key_type_logon, desc, "");
2366 if (IS_ERR(key)) {
2367 rc = PTR_ERR(key);
2368 goto out_err;
2369 }
2370 }
2371
2372 down_read(&key->sem);
2373 upayload = key->payload.data;
2374 if (IS_ERR_OR_NULL(upayload)) {
2375 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2376 goto out_key_put;
2377 }
2378
2379 /* find first : in payload */
2380 payload = (char *)upayload->data;
2381 delim = strnchr(payload, upayload->datalen, ':');
2382 cifs_dbg(FYI, "payload=%s\n", payload);
2383 if (!delim) {
2384 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2385 upayload->datalen);
2386 rc = -EINVAL;
2387 goto out_key_put;
2388 }
2389
2390 len = delim - payload;
2391 if (len > MAX_USERNAME_SIZE || len <= 0) {
2392 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2393 len);
2394 rc = -EINVAL;
2395 goto out_key_put;
2396 }
2397
2398 vol->username = kstrndup(payload, len, GFP_KERNEL);
2399 if (!vol->username) {
2400 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2401 len);
2402 rc = -ENOMEM;
2403 goto out_key_put;
2404 }
2405 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2406
2407 len = key->datalen - (len + 1);
2408 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2409 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2410 rc = -EINVAL;
2411 kfree(vol->username);
2412 vol->username = NULL;
2413 goto out_key_put;
2414 }
2415
2416 ++delim;
2417 vol->password = kstrndup(delim, len, GFP_KERNEL);
2418 if (!vol->password) {
2419 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2420 len);
2421 rc = -ENOMEM;
2422 kfree(vol->username);
2423 vol->username = NULL;
2424 goto out_key_put;
2425 }
2426
2427 out_key_put:
2428 up_read(&key->sem);
2429 key_put(key);
2430 out_err:
2431 kfree(desc);
2432 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2433 return rc;
2434 }
2435 #else /* ! CONFIG_KEYS */
2436 static inline int
2437 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2438 struct cifs_ses *ses __attribute__((unused)))
2439 {
2440 return -ENOSYS;
2441 }
2442 #endif /* CONFIG_KEYS */
2443
2444 static struct cifs_ses *
2445 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2446 {
2447 int rc = -ENOMEM;
2448 unsigned int xid;
2449 struct cifs_ses *ses;
2450 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2451 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2452
2453 xid = get_xid();
2454
2455 ses = cifs_find_smb_ses(server, volume_info);
2456 if (ses) {
2457 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2458 ses->status);
2459
2460 mutex_lock(&ses->session_mutex);
2461 rc = cifs_negotiate_protocol(xid, ses);
2462 if (rc) {
2463 mutex_unlock(&ses->session_mutex);
2464 /* problem -- put our ses reference */
2465 cifs_put_smb_ses(ses);
2466 free_xid(xid);
2467 return ERR_PTR(rc);
2468 }
2469 if (ses->need_reconnect) {
2470 cifs_dbg(FYI, "Session needs reconnect\n");
2471 rc = cifs_setup_session(xid, ses,
2472 volume_info->local_nls);
2473 if (rc) {
2474 mutex_unlock(&ses->session_mutex);
2475 /* problem -- put our reference */
2476 cifs_put_smb_ses(ses);
2477 free_xid(xid);
2478 return ERR_PTR(rc);
2479 }
2480 }
2481 mutex_unlock(&ses->session_mutex);
2482
2483 /* existing SMB ses has a server reference already */
2484 cifs_put_tcp_session(server, 0);
2485 free_xid(xid);
2486 return ses;
2487 }
2488
2489 cifs_dbg(FYI, "Existing smb sess not found\n");
2490 ses = sesInfoAlloc();
2491 if (ses == NULL)
2492 goto get_ses_fail;
2493
2494 /* new SMB session uses our server ref */
2495 ses->server = server;
2496 if (server->dstaddr.ss_family == AF_INET6)
2497 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2498 else
2499 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2500
2501 if (volume_info->username) {
2502 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2503 if (!ses->user_name)
2504 goto get_ses_fail;
2505 }
2506
2507 /* volume_info->password freed at unmount */
2508 if (volume_info->password) {
2509 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2510 if (!ses->password)
2511 goto get_ses_fail;
2512 }
2513 if (volume_info->domainname) {
2514 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2515 if (!ses->domainName)
2516 goto get_ses_fail;
2517 }
2518 ses->cred_uid = volume_info->cred_uid;
2519 ses->linux_uid = volume_info->linux_uid;
2520
2521 ses->overrideSecFlg = volume_info->secFlg;
2522
2523 mutex_lock(&ses->session_mutex);
2524 rc = cifs_negotiate_protocol(xid, ses);
2525 if (!rc)
2526 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2527 mutex_unlock(&ses->session_mutex);
2528 if (rc)
2529 goto get_ses_fail;
2530
2531 /* success, put it on the list */
2532 spin_lock(&cifs_tcp_ses_lock);
2533 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2534 spin_unlock(&cifs_tcp_ses_lock);
2535
2536 free_xid(xid);
2537 return ses;
2538
2539 get_ses_fail:
2540 sesInfoFree(ses);
2541 free_xid(xid);
2542 return ERR_PTR(rc);
2543 }
2544
2545 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2546 {
2547 if (tcon->tidStatus == CifsExiting)
2548 return 0;
2549 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2550 return 0;
2551 return 1;
2552 }
2553
2554 static struct cifs_tcon *
2555 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2556 {
2557 struct list_head *tmp;
2558 struct cifs_tcon *tcon;
2559
2560 spin_lock(&cifs_tcp_ses_lock);
2561 list_for_each(tmp, &ses->tcon_list) {
2562 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2563 if (!match_tcon(tcon, unc))
2564 continue;
2565 ++tcon->tc_count;
2566 spin_unlock(&cifs_tcp_ses_lock);
2567 return tcon;
2568 }
2569 spin_unlock(&cifs_tcp_ses_lock);
2570 return NULL;
2571 }
2572
2573 void
2574 cifs_put_tcon(struct cifs_tcon *tcon)
2575 {
2576 unsigned int xid;
2577 struct cifs_ses *ses = tcon->ses;
2578
2579 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2580 spin_lock(&cifs_tcp_ses_lock);
2581 if (--tcon->tc_count > 0) {
2582 spin_unlock(&cifs_tcp_ses_lock);
2583 return;
2584 }
2585
2586 list_del_init(&tcon->tcon_list);
2587 spin_unlock(&cifs_tcp_ses_lock);
2588
2589 xid = get_xid();
2590 if (ses->server->ops->tree_disconnect)
2591 ses->server->ops->tree_disconnect(xid, tcon);
2592 _free_xid(xid);
2593
2594 cifs_fscache_release_super_cookie(tcon);
2595 tconInfoFree(tcon);
2596 cifs_put_smb_ses(ses);
2597 }
2598
2599 static struct cifs_tcon *
2600 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2601 {
2602 int rc, xid;
2603 struct cifs_tcon *tcon;
2604
2605 tcon = cifs_find_tcon(ses, volume_info->UNC);
2606 if (tcon) {
2607 cifs_dbg(FYI, "Found match on UNC path\n");
2608 /* existing tcon already has a reference */
2609 cifs_put_smb_ses(ses);
2610 if (tcon->seal != volume_info->seal)
2611 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2612 return tcon;
2613 }
2614
2615 if (!ses->server->ops->tree_connect) {
2616 rc = -ENOSYS;
2617 goto out_fail;
2618 }
2619
2620 tcon = tconInfoAlloc();
2621 if (tcon == NULL) {
2622 rc = -ENOMEM;
2623 goto out_fail;
2624 }
2625
2626 tcon->ses = ses;
2627 if (volume_info->password) {
2628 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2629 if (!tcon->password) {
2630 rc = -ENOMEM;
2631 goto out_fail;
2632 }
2633 }
2634
2635 /*
2636 * BB Do we need to wrap session_mutex around this TCon call and Unix
2637 * SetFS as we do on SessSetup and reconnect?
2638 */
2639 xid = get_xid();
2640 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2641 volume_info->local_nls);
2642 free_xid(xid);
2643 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2644 if (rc)
2645 goto out_fail;
2646
2647 if (volume_info->nodfs) {
2648 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2649 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2650 }
2651 tcon->seal = volume_info->seal;
2652 /*
2653 * We can have only one retry value for a connection to a share so for
2654 * resources mounted more than once to the same server share the last
2655 * value passed in for the retry flag is used.
2656 */
2657 tcon->retry = volume_info->retry;
2658 tcon->nocase = volume_info->nocase;
2659 tcon->local_lease = volume_info->local_lease;
2660 INIT_LIST_HEAD(&tcon->pending_opens);
2661
2662 spin_lock(&cifs_tcp_ses_lock);
2663 list_add(&tcon->tcon_list, &ses->tcon_list);
2664 spin_unlock(&cifs_tcp_ses_lock);
2665
2666 cifs_fscache_get_super_cookie(tcon);
2667
2668 return tcon;
2669
2670 out_fail:
2671 tconInfoFree(tcon);
2672 return ERR_PTR(rc);
2673 }
2674
2675 void
2676 cifs_put_tlink(struct tcon_link *tlink)
2677 {
2678 if (!tlink || IS_ERR(tlink))
2679 return;
2680
2681 if (!atomic_dec_and_test(&tlink->tl_count) ||
2682 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2683 tlink->tl_time = jiffies;
2684 return;
2685 }
2686
2687 if (!IS_ERR(tlink_tcon(tlink)))
2688 cifs_put_tcon(tlink_tcon(tlink));
2689 kfree(tlink);
2690 return;
2691 }
2692
2693 static inline struct tcon_link *
2694 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2695 {
2696 return cifs_sb->master_tlink;
2697 }
2698
2699 static int
2700 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2701 {
2702 struct cifs_sb_info *old = CIFS_SB(sb);
2703 struct cifs_sb_info *new = mnt_data->cifs_sb;
2704
2705 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2706 return 0;
2707
2708 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2709 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2710 return 0;
2711
2712 /*
2713 * We want to share sb only if we don't specify an r/wsize or
2714 * specified r/wsize is greater than or equal to existing one.
2715 */
2716 if (new->wsize && new->wsize < old->wsize)
2717 return 0;
2718
2719 if (new->rsize && new->rsize < old->rsize)
2720 return 0;
2721
2722 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2723 return 0;
2724
2725 if (old->mnt_file_mode != new->mnt_file_mode ||
2726 old->mnt_dir_mode != new->mnt_dir_mode)
2727 return 0;
2728
2729 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2730 return 0;
2731
2732 if (old->actimeo != new->actimeo)
2733 return 0;
2734
2735 return 1;
2736 }
2737
2738 static int
2739 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2740 {
2741 struct cifs_sb_info *old = CIFS_SB(sb);
2742 struct cifs_sb_info *new = mnt_data->cifs_sb;
2743
2744 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2745 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2746 return 0;
2747 /* The prepath should be null terminated strings */
2748 if (strcmp(new->prepath, old->prepath))
2749 return 0;
2750
2751 return 1;
2752 }
2753 return 0;
2754 }
2755
2756 int
2757 cifs_match_super(struct super_block *sb, void *data)
2758 {
2759 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2760 struct smb_vol *volume_info;
2761 struct cifs_sb_info *cifs_sb;
2762 struct TCP_Server_Info *tcp_srv;
2763 struct cifs_ses *ses;
2764 struct cifs_tcon *tcon;
2765 struct tcon_link *tlink;
2766 int rc = 0;
2767
2768 spin_lock(&cifs_tcp_ses_lock);
2769 cifs_sb = CIFS_SB(sb);
2770 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2771 if (IS_ERR(tlink)) {
2772 spin_unlock(&cifs_tcp_ses_lock);
2773 return rc;
2774 }
2775 tcon = tlink_tcon(tlink);
2776 ses = tcon->ses;
2777 tcp_srv = ses->server;
2778
2779 volume_info = mnt_data->vol;
2780
2781 if (!match_server(tcp_srv, volume_info) ||
2782 !match_session(ses, volume_info) ||
2783 !match_tcon(tcon, volume_info->UNC) ||
2784 !match_prepath(sb, mnt_data)) {
2785 rc = 0;
2786 goto out;
2787 }
2788
2789 rc = compare_mount_options(sb, mnt_data);
2790 out:
2791 spin_unlock(&cifs_tcp_ses_lock);
2792 cifs_put_tlink(tlink);
2793 return rc;
2794 }
2795
2796 int
2797 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2798 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2799 struct dfs_info3_param **referrals, int remap)
2800 {
2801 char *temp_unc;
2802 int rc = 0;
2803
2804 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2805 return -ENOSYS;
2806
2807 *num_referrals = 0;
2808 *referrals = NULL;
2809
2810 if (ses->ipc_tid == 0) {
2811 temp_unc = kmalloc(2 /* for slashes */ +
2812 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2813 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2814 if (temp_unc == NULL)
2815 return -ENOMEM;
2816 temp_unc[0] = '\\';
2817 temp_unc[1] = '\\';
2818 strcpy(temp_unc + 2, ses->serverName);
2819 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2820 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2821 nls_codepage);
2822 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2823 kfree(temp_unc);
2824 }
2825 if (rc == 0)
2826 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2827 referrals, num_referrals,
2828 nls_codepage, remap);
2829 /*
2830 * BB - map targetUNCs to dfs_info3 structures, here or in
2831 * ses->server->ops->get_dfs_refer.
2832 */
2833
2834 return rc;
2835 }
2836
2837 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2838 static struct lock_class_key cifs_key[2];
2839 static struct lock_class_key cifs_slock_key[2];
2840
2841 static inline void
2842 cifs_reclassify_socket4(struct socket *sock)
2843 {
2844 struct sock *sk = sock->sk;
2845 BUG_ON(sock_owned_by_user(sk));
2846 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2847 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2848 }
2849
2850 static inline void
2851 cifs_reclassify_socket6(struct socket *sock)
2852 {
2853 struct sock *sk = sock->sk;
2854 BUG_ON(sock_owned_by_user(sk));
2855 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2856 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2857 }
2858 #else
2859 static inline void
2860 cifs_reclassify_socket4(struct socket *sock)
2861 {
2862 }
2863
2864 static inline void
2865 cifs_reclassify_socket6(struct socket *sock)
2866 {
2867 }
2868 #endif
2869
2870 /* See RFC1001 section 14 on representation of Netbios names */
2871 static void rfc1002mangle(char *target, char *source, unsigned int length)
2872 {
2873 unsigned int i, j;
2874
2875 for (i = 0, j = 0; i < (length); i++) {
2876 /* mask a nibble at a time and encode */
2877 target[j] = 'A' + (0x0F & (source[i] >> 4));
2878 target[j+1] = 'A' + (0x0F & source[i]);
2879 j += 2;
2880 }
2881
2882 }
2883
2884 static int
2885 bind_socket(struct TCP_Server_Info *server)
2886 {
2887 int rc = 0;
2888 if (server->srcaddr.ss_family != AF_UNSPEC) {
2889 /* Bind to the specified local IP address */
2890 struct socket *socket = server->ssocket;
2891 rc = socket->ops->bind(socket,
2892 (struct sockaddr *) &server->srcaddr,
2893 sizeof(server->srcaddr));
2894 if (rc < 0) {
2895 struct sockaddr_in *saddr4;
2896 struct sockaddr_in6 *saddr6;
2897 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2898 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2899 if (saddr6->sin6_family == AF_INET6)
2900 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2901 &saddr6->sin6_addr, rc);
2902 else
2903 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2904 &saddr4->sin_addr.s_addr, rc);
2905 }
2906 }
2907 return rc;
2908 }
2909
2910 static int
2911 ip_rfc1001_connect(struct TCP_Server_Info *server)
2912 {
2913 int rc = 0;
2914 /*
2915 * some servers require RFC1001 sessinit before sending
2916 * negprot - BB check reconnection in case where second
2917 * sessinit is sent but no second negprot
2918 */
2919 struct rfc1002_session_packet *ses_init_buf;
2920 struct smb_hdr *smb_buf;
2921 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2922 GFP_KERNEL);
2923 if (ses_init_buf) {
2924 ses_init_buf->trailer.session_req.called_len = 32;
2925
2926 if (server->server_RFC1001_name &&
2927 server->server_RFC1001_name[0] != 0)
2928 rfc1002mangle(ses_init_buf->trailer.
2929 session_req.called_name,
2930 server->server_RFC1001_name,
2931 RFC1001_NAME_LEN_WITH_NULL);
2932 else
2933 rfc1002mangle(ses_init_buf->trailer.
2934 session_req.called_name,
2935 DEFAULT_CIFS_CALLED_NAME,
2936 RFC1001_NAME_LEN_WITH_NULL);
2937
2938 ses_init_buf->trailer.session_req.calling_len = 32;
2939
2940 /*
2941 * calling name ends in null (byte 16) from old smb
2942 * convention.
2943 */
2944 if (server->workstation_RFC1001_name &&
2945 server->workstation_RFC1001_name[0] != 0)
2946 rfc1002mangle(ses_init_buf->trailer.
2947 session_req.calling_name,
2948 server->workstation_RFC1001_name,
2949 RFC1001_NAME_LEN_WITH_NULL);
2950 else
2951 rfc1002mangle(ses_init_buf->trailer.
2952 session_req.calling_name,
2953 "LINUX_CIFS_CLNT",
2954 RFC1001_NAME_LEN_WITH_NULL);
2955
2956 ses_init_buf->trailer.session_req.scope1 = 0;
2957 ses_init_buf->trailer.session_req.scope2 = 0;
2958 smb_buf = (struct smb_hdr *)ses_init_buf;
2959
2960 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2961 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2962 rc = smb_send(server, smb_buf, 0x44);
2963 kfree(ses_init_buf);
2964 /*
2965 * RFC1001 layer in at least one server
2966 * requires very short break before negprot
2967 * presumably because not expecting negprot
2968 * to follow so fast. This is a simple
2969 * solution that works without
2970 * complicating the code and causes no
2971 * significant slowing down on mount
2972 * for everyone else
2973 */
2974 usleep_range(1000, 2000);
2975 }
2976 /*
2977 * else the negprot may still work without this
2978 * even though malloc failed
2979 */
2980
2981 return rc;
2982 }
2983
2984 static int
2985 generic_ip_connect(struct TCP_Server_Info *server)
2986 {
2987 int rc = 0;
2988 __be16 sport;
2989 int slen, sfamily;
2990 struct socket *socket = server->ssocket;
2991 struct sockaddr *saddr;
2992
2993 saddr = (struct sockaddr *) &server->dstaddr;
2994
2995 if (server->dstaddr.ss_family == AF_INET6) {
2996 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2997 slen = sizeof(struct sockaddr_in6);
2998 sfamily = AF_INET6;
2999 } else {
3000 sport = ((struct sockaddr_in *) saddr)->sin_port;
3001 slen = sizeof(struct sockaddr_in);
3002 sfamily = AF_INET;
3003 }
3004
3005 if (socket == NULL) {
3006 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3007 IPPROTO_TCP, &socket, 1);
3008 if (rc < 0) {
3009 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3010 server->ssocket = NULL;
3011 return rc;
3012 }
3013
3014 /* BB other socket options to set KEEPALIVE, NODELAY? */
3015 cifs_dbg(FYI, "Socket created\n");
3016 server->ssocket = socket;
3017 socket->sk->sk_allocation = GFP_NOFS;
3018 if (sfamily == AF_INET6)
3019 cifs_reclassify_socket6(socket);
3020 else
3021 cifs_reclassify_socket4(socket);
3022 }
3023
3024 rc = bind_socket(server);
3025 if (rc < 0)
3026 return rc;
3027
3028 /*
3029 * Eventually check for other socket options to change from
3030 * the default. sock_setsockopt not used because it expects
3031 * user space buffer
3032 */
3033 socket->sk->sk_rcvtimeo = 7 * HZ;
3034 socket->sk->sk_sndtimeo = 5 * HZ;
3035
3036 /* make the bufsizes depend on wsize/rsize and max requests */
3037 if (server->noautotune) {
3038 if (socket->sk->sk_sndbuf < (200 * 1024))
3039 socket->sk->sk_sndbuf = 200 * 1024;
3040 if (socket->sk->sk_rcvbuf < (140 * 1024))
3041 socket->sk->sk_rcvbuf = 140 * 1024;
3042 }
3043
3044 if (server->tcp_nodelay) {
3045 int val = 1;
3046 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3047 (char *)&val, sizeof(val));
3048 if (rc)
3049 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3050 rc);
3051 }
3052
3053 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3054 socket->sk->sk_sndbuf,
3055 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3056
3057 rc = socket->ops->connect(socket, saddr, slen, 0);
3058 if (rc < 0) {
3059 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3060 sock_release(socket);
3061 server->ssocket = NULL;
3062 return rc;
3063 }
3064
3065 if (sport == htons(RFC1001_PORT))
3066 rc = ip_rfc1001_connect(server);
3067
3068 return rc;
3069 }
3070
3071 static int
3072 ip_connect(struct TCP_Server_Info *server)
3073 {
3074 __be16 *sport;
3075 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3076 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3077
3078 if (server->dstaddr.ss_family == AF_INET6)
3079 sport = &addr6->sin6_port;
3080 else
3081 sport = &addr->sin_port;
3082
3083 if (*sport == 0) {
3084 int rc;
3085
3086 /* try with 445 port at first */
3087 *sport = htons(CIFS_PORT);
3088
3089 rc = generic_ip_connect(server);
3090 if (rc >= 0)
3091 return rc;
3092
3093 /* if it failed, try with 139 port */
3094 *sport = htons(RFC1001_PORT);
3095 }
3096
3097 return generic_ip_connect(server);
3098 }
3099
3100 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3101 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3102 {
3103 /* if we are reconnecting then should we check to see if
3104 * any requested capabilities changed locally e.g. via
3105 * remount but we can not do much about it here
3106 * if they have (even if we could detect it by the following)
3107 * Perhaps we could add a backpointer to array of sb from tcon
3108 * or if we change to make all sb to same share the same
3109 * sb as NFS - then we only have one backpointer to sb.
3110 * What if we wanted to mount the server share twice once with
3111 * and once without posixacls or posix paths? */
3112 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3113
3114 if (vol_info && vol_info->no_linux_ext) {
3115 tcon->fsUnixInfo.Capability = 0;
3116 tcon->unix_ext = 0; /* Unix Extensions disabled */
3117 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3118 return;
3119 } else if (vol_info)
3120 tcon->unix_ext = 1; /* Unix Extensions supported */
3121
3122 if (tcon->unix_ext == 0) {
3123 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3124 return;
3125 }
3126
3127 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3128 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3129 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3130 /* check for reconnect case in which we do not
3131 want to change the mount behavior if we can avoid it */
3132 if (vol_info == NULL) {
3133 /* turn off POSIX ACL and PATHNAMES if not set
3134 originally at mount time */
3135 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3136 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3137 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3138 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3139 cifs_dbg(VFS, "POSIXPATH support change\n");
3140 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3141 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3142 cifs_dbg(VFS, "possible reconnect error\n");
3143 cifs_dbg(VFS, "server disabled POSIX path support\n");
3144 }
3145 }
3146
3147 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3148 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3149
3150 cap &= CIFS_UNIX_CAP_MASK;
3151 if (vol_info && vol_info->no_psx_acl)
3152 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3153 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3154 cifs_dbg(FYI, "negotiated posix acl support\n");
3155 if (cifs_sb)
3156 cifs_sb->mnt_cifs_flags |=
3157 CIFS_MOUNT_POSIXACL;
3158 }
3159
3160 if (vol_info && vol_info->posix_paths == 0)
3161 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3162 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3163 cifs_dbg(FYI, "negotiate posix pathnames\n");
3164 if (cifs_sb)
3165 cifs_sb->mnt_cifs_flags |=
3166 CIFS_MOUNT_POSIX_PATHS;
3167 }
3168
3169 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3170 #ifdef CONFIG_CIFS_DEBUG2
3171 if (cap & CIFS_UNIX_FCNTL_CAP)
3172 cifs_dbg(FYI, "FCNTL cap\n");
3173 if (cap & CIFS_UNIX_EXTATTR_CAP)
3174 cifs_dbg(FYI, "EXTATTR cap\n");
3175 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3176 cifs_dbg(FYI, "POSIX path cap\n");
3177 if (cap & CIFS_UNIX_XATTR_CAP)
3178 cifs_dbg(FYI, "XATTR cap\n");
3179 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3180 cifs_dbg(FYI, "POSIX ACL cap\n");
3181 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3182 cifs_dbg(FYI, "very large read cap\n");
3183 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3184 cifs_dbg(FYI, "very large write cap\n");
3185 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3186 cifs_dbg(FYI, "transport encryption cap\n");
3187 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3188 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3189 #endif /* CIFS_DEBUG2 */
3190 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3191 if (vol_info == NULL) {
3192 cifs_dbg(FYI, "resetting capabilities failed\n");
3193 } else
3194 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");
3195
3196 }
3197 }
3198 }
3199
3200 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3201 struct cifs_sb_info *cifs_sb)
3202 {
3203 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3204
3205 spin_lock_init(&cifs_sb->tlink_tree_lock);
3206 cifs_sb->tlink_tree = RB_ROOT;
3207
3208 /*
3209 * Temporarily set r/wsize for matching superblock. If we end up using
3210 * new sb then client will later negotiate it downward if needed.
3211 */
3212 cifs_sb->rsize = pvolume_info->rsize;
3213 cifs_sb->wsize = pvolume_info->wsize;
3214
3215 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3216 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3217 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3218 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3219 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3220 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3221
3222 cifs_sb->actimeo = pvolume_info->actimeo;
3223 cifs_sb->local_nls = pvolume_info->local_nls;
3224
3225 if (pvolume_info->noperm)
3226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3227 if (pvolume_info->setuids)
3228 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3229 if (pvolume_info->server_ino)
3230 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3231 if (pvolume_info->remap)
3232 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3233 if (pvolume_info->no_xattr)
3234 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3235 if (pvolume_info->sfu_emul)
3236 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3237 if (pvolume_info->nobrl)
3238 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3239 if (pvolume_info->nostrictsync)
3240 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3241 if (pvolume_info->mand_lock)
3242 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3243 if (pvolume_info->rwpidforward)
3244 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3245 if (pvolume_info->cifs_acl)
3246 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3247 if (pvolume_info->backupuid_specified) {
3248 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3249 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3250 }
3251 if (pvolume_info->backupgid_specified) {
3252 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3253 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3254 }
3255 if (pvolume_info->override_uid)
3256 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3257 if (pvolume_info->override_gid)
3258 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3259 if (pvolume_info->dynperm)
3260 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3261 if (pvolume_info->fsc)
3262 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3263 if (pvolume_info->multiuser)
3264 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3265 CIFS_MOUNT_NO_PERM);
3266 if (pvolume_info->strict_io)
3267 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3268 if (pvolume_info->direct_io) {
3269 cifs_dbg(FYI, "mounting share using direct i/o\n");
3270 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3271 }
3272 if (pvolume_info->mfsymlinks) {
3273 if (pvolume_info->sfu_emul) {
3274 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3275 } else {
3276 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3277 }
3278 }
3279
3280 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3281 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3282
3283
3284 if (pvolume_info->prepath) {
3285 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3286 if (cifs_sb->prepath == NULL)
3287 return -ENOMEM;
3288 }
3289
3290 return 0;
3291 }
3292
3293 static void
3294 cleanup_volume_info_contents(struct smb_vol *volume_info)
3295 {
3296 kfree(volume_info->username);
3297 kzfree(volume_info->password);
3298 kfree(volume_info->UNC);
3299 kfree(volume_info->domainname);
3300 kfree(volume_info->iocharset);
3301 kfree(volume_info->prepath);
3302 }
3303
3304 void
3305 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3306 {
3307 if (!volume_info)
3308 return;
3309 cleanup_volume_info_contents(volume_info);
3310 kfree(volume_info);
3311 }
3312
3313
3314 #ifdef CONFIG_CIFS_DFS_UPCALL
3315 /*
3316 * cifs_build_path_to_root returns full path to root when we do not have an
3317 * exiting connection (tcon)
3318 */
3319 static char *
3320 build_unc_path_to_root(const struct smb_vol *vol,
3321 const struct cifs_sb_info *cifs_sb)
3322 {
3323 char *full_path, *pos;
3324 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3325 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3326
3327 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3328 if (full_path == NULL)
3329 return ERR_PTR(-ENOMEM);
3330
3331 strncpy(full_path, vol->UNC, unc_len);
3332 pos = full_path + unc_len;
3333
3334 if (pplen) {
3335 *pos = CIFS_DIR_SEP(cifs_sb);
3336 strncpy(pos + 1, vol->prepath, pplen);
3337 pos += pplen;
3338 }
3339
3340 *pos = '\0'; /* add trailing null */
3341 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3342 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3343 return full_path;
3344 }
3345
3346 /*
3347 * Perform a dfs referral query for a share and (optionally) prefix
3348 *
3349 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3350 * to a string containing updated options for the submount. Otherwise it
3351 * will be left untouched.
3352 *
3353 * Returns the rc from get_dfs_path to the caller, which can be used to
3354 * determine whether there were referrals.
3355 */
3356 static int
3357 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3358 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3359 int check_prefix)
3360 {
3361 int rc;
3362 unsigned int num_referrals = 0;
3363 struct dfs_info3_param *referrals = NULL;
3364 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3365
3366 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3367 if (IS_ERR(full_path))
3368 return PTR_ERR(full_path);
3369
3370 /* For DFS paths, skip the first '\' of the UNC */
3371 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3372
3373 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3374 &num_referrals, &referrals,
3375 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3376
3377 if (!rc && num_referrals > 0) {
3378 char *fake_devname = NULL;
3379
3380 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3381 full_path + 1, referrals,
3382 &fake_devname);
3383
3384 free_dfs_info_array(referrals, num_referrals);
3385
3386 if (IS_ERR(mdata)) {
3387 rc = PTR_ERR(mdata);
3388 mdata = NULL;
3389 } else {
3390 cleanup_volume_info_contents(volume_info);
3391 rc = cifs_setup_volume_info(volume_info, mdata,
3392 fake_devname);
3393 }
3394 kfree(fake_devname);
3395 kfree(cifs_sb->mountdata);
3396 cifs_sb->mountdata = mdata;
3397 }
3398 kfree(full_path);
3399 return rc;
3400 }
3401 #endif
3402
3403 static int
3404 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3405 const char *devname)
3406 {
3407 int rc = 0;
3408
3409 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3410 return -EINVAL;
3411
3412 if (volume_info->nullauth) {
3413 cifs_dbg(FYI, "Anonymous login\n");
3414 kfree(volume_info->username);
3415 volume_info->username = NULL;
3416 } else if (volume_info->username) {
3417 /* BB fixme parse for domain name here */
3418 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3419 } else {
3420 cifs_dbg(VFS, "No username specified\n");
3421 /* In userspace mount helper we can get user name from alternate
3422 locations such as env variables and files on disk */
3423 return -EINVAL;
3424 }
3425
3426 /* this is needed for ASCII cp to Unicode converts */
3427 if (volume_info->iocharset == NULL) {
3428 /* load_nls_default cannot return null */
3429 volume_info->local_nls = load_nls_default();
3430 } else {
3431 volume_info->local_nls = load_nls(volume_info->iocharset);
3432 if (volume_info->local_nls == NULL) {
3433 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3434 volume_info->iocharset);
3435 return -ELIBACC;
3436 }
3437 }
3438
3439 return rc;
3440 }
3441
3442 struct smb_vol *
3443 cifs_get_volume_info(char *mount_data, const char *devname)
3444 {
3445 int rc;
3446 struct smb_vol *volume_info;
3447
3448 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3449 if (!volume_info)
3450 return ERR_PTR(-ENOMEM);
3451
3452 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3453 if (rc) {
3454 cifs_cleanup_volume_info(volume_info);
3455 volume_info = ERR_PTR(rc);
3456 }
3457
3458 return volume_info;
3459 }
3460
3461 static int
3462 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3463 unsigned int xid,
3464 struct cifs_tcon *tcon,
3465 struct cifs_sb_info *cifs_sb,
3466 char *full_path)
3467 {
3468 int rc;
3469 char *s;
3470 char sep, tmp;
3471
3472 sep = CIFS_DIR_SEP(cifs_sb);
3473 s = full_path;
3474
3475 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3476 while (rc == 0) {
3477 /* skip separators */
3478 while (*s == sep)
3479 s++;
3480 if (!*s)
3481 break;
3482 /* next separator */
3483 while (*s && *s != sep)
3484 s++;
3485
3486 /*
3487 * temporarily null-terminate the path at the end of
3488 * the current component
3489 */
3490 tmp = *s;
3491 *s = 0;
3492 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3493 full_path);
3494 *s = tmp;
3495 }
3496 return rc;
3497 }
3498
3499 int
3500 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3501 {
3502 int rc;
3503 unsigned int xid;
3504 struct cifs_ses *ses;
3505 struct cifs_tcon *tcon;
3506 struct TCP_Server_Info *server;
3507 char *full_path;
3508 struct tcon_link *tlink;
3509 #ifdef CONFIG_CIFS_DFS_UPCALL
3510 int referral_walks_count = 0;
3511 #endif
3512
3513 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3514 if (rc)
3515 return rc;
3516
3517 #ifdef CONFIG_CIFS_DFS_UPCALL
3518 try_mount_again:
3519 /* cleanup activities if we're chasing a referral */
3520 if (referral_walks_count) {
3521 if (tcon)
3522 cifs_put_tcon(tcon);
3523 else if (ses)
3524 cifs_put_smb_ses(ses);
3525
3526 free_xid(xid);
3527 }
3528 #endif
3529 rc = 0;
3530 tcon = NULL;
3531 ses = NULL;
3532 server = NULL;
3533 full_path = NULL;
3534 tlink = NULL;
3535
3536 xid = get_xid();
3537
3538 /* get a reference to a tcp session */
3539 server = cifs_get_tcp_session(volume_info);
3540 if (IS_ERR(server)) {
3541 rc = PTR_ERR(server);
3542 bdi_destroy(&cifs_sb->bdi);
3543 goto out;
3544 }
3545
3546 /* get a reference to a SMB session */
3547 ses = cifs_get_smb_ses(server, volume_info);
3548 if (IS_ERR(ses)) {
3549 rc = PTR_ERR(ses);
3550 ses = NULL;
3551 goto mount_fail_check;
3552 }
3553
3554 /* search for existing tcon to this server share */
3555 tcon = cifs_get_tcon(ses, volume_info);
3556 if (IS_ERR(tcon)) {
3557 rc = PTR_ERR(tcon);
3558 tcon = NULL;
3559 goto remote_path_check;
3560 }
3561
3562 /* tell server which Unix caps we support */
3563 if (cap_unix(tcon->ses)) {
3564 /* reset of caps checks mount to see if unix extensions
3565 disabled for just this mount */
3566 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3567 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3568 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3569 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3570 rc = -EACCES;
3571 goto mount_fail_check;
3572 }
3573 } else
3574 tcon->unix_ext = 0; /* server does not support them */
3575
3576 /* do not care if a following call succeed - informational */
3577 if (!tcon->ipc && server->ops->qfs_tcon)
3578 server->ops->qfs_tcon(xid, tcon);
3579
3580 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3581 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3582
3583 /* tune readahead according to rsize */
3584 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3585
3586 remote_path_check:
3587 #ifdef CONFIG_CIFS_DFS_UPCALL
3588 /*
3589 * Perform an unconditional check for whether there are DFS
3590 * referrals for this path without prefix, to provide support
3591 * for DFS referrals from w2k8 servers which don't seem to respond
3592 * with PATH_NOT_COVERED to requests that include the prefix.
3593 * Chase the referral if found, otherwise continue normally.
3594 */
3595 if (referral_walks_count == 0) {
3596 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3597 false);
3598 if (!refrc) {
3599 referral_walks_count++;
3600 goto try_mount_again;
3601 }
3602 }
3603 #endif
3604
3605 /* check if a whole path is not remote */
3606 if (!rc && tcon) {
3607 if (!server->ops->is_path_accessible) {
3608 rc = -ENOSYS;
3609 goto mount_fail_check;
3610 }
3611 /*
3612 * cifs_build_path_to_root works only when we have a valid tcon
3613 */
3614 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3615 if (full_path == NULL) {
3616 rc = -ENOMEM;
3617 goto mount_fail_check;
3618 }
3619 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3620 full_path);
3621 if (rc != 0 && rc != -EREMOTE) {
3622 kfree(full_path);
3623 goto mount_fail_check;
3624 }
3625
3626 rc = cifs_are_all_path_components_accessible(server,
3627 xid, tcon, cifs_sb,
3628 full_path);
3629 if (rc != 0) {
3630 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3631 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3632 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3633 rc = 0;
3634 }
3635 kfree(full_path);
3636 }
3637
3638 /* get referral if needed */
3639 if (rc == -EREMOTE) {
3640 #ifdef CONFIG_CIFS_DFS_UPCALL
3641 if (referral_walks_count > MAX_NESTED_LINKS) {
3642 /*
3643 * BB: when we implement proper loop detection,
3644 * we will remove this check. But now we need it
3645 * to prevent an indefinite loop if 'DFS tree' is
3646 * misconfigured (i.e. has loops).
3647 */
3648 rc = -ELOOP;
3649 goto mount_fail_check;
3650 }
3651
3652 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3653
3654 if (!rc) {
3655 referral_walks_count++;
3656 goto try_mount_again;
3657 }
3658 goto mount_fail_check;
3659 #else /* No DFS support, return error on mount */
3660 rc = -EOPNOTSUPP;
3661 #endif
3662 }
3663
3664 if (rc)
3665 goto mount_fail_check;
3666
3667 /* now, hang the tcon off of the superblock */
3668 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3669 if (tlink == NULL) {
3670 rc = -ENOMEM;
3671 goto mount_fail_check;
3672 }
3673
3674 tlink->tl_uid = ses->linux_uid;
3675 tlink->tl_tcon = tcon;
3676 tlink->tl_time = jiffies;
3677 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3678 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3679
3680 cifs_sb->master_tlink = tlink;
3681 spin_lock(&cifs_sb->tlink_tree_lock);
3682 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3683 spin_unlock(&cifs_sb->tlink_tree_lock);
3684
3685 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3686 TLINK_IDLE_EXPIRE);
3687
3688 mount_fail_check:
3689 /* on error free sesinfo and tcon struct if needed */
3690 if (rc) {
3691 /* If find_unc succeeded then rc == 0 so we can not end */
3692 /* up accidentally freeing someone elses tcon struct */
3693 if (tcon)
3694 cifs_put_tcon(tcon);
3695 else if (ses)
3696 cifs_put_smb_ses(ses);
3697 else
3698 cifs_put_tcp_session(server, 0);
3699 bdi_destroy(&cifs_sb->bdi);
3700 }
3701
3702 out:
3703 free_xid(xid);
3704 return rc;
3705 }
3706
3707 /*
3708 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3709 * pointer may be NULL.
3710 */
3711 int
3712 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3713 const char *tree, struct cifs_tcon *tcon,
3714 const struct nls_table *nls_codepage)
3715 {
3716 struct smb_hdr *smb_buffer;
3717 struct smb_hdr *smb_buffer_response;
3718 TCONX_REQ *pSMB;
3719 TCONX_RSP *pSMBr;
3720 unsigned char *bcc_ptr;
3721 int rc = 0;
3722 int length;
3723 __u16 bytes_left, count;
3724
3725 if (ses == NULL)
3726 return -EIO;
3727
3728 smb_buffer = cifs_buf_get();
3729 if (smb_buffer == NULL)
3730 return -ENOMEM;
3731
3732 smb_buffer_response = smb_buffer;
3733
3734 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3735 NULL /*no tid */ , 4 /*wct */ );
3736
3737 smb_buffer->Mid = get_next_mid(ses->server);
3738 smb_buffer->Uid = ses->Suid;
3739 pSMB = (TCONX_REQ *) smb_buffer;
3740 pSMBr = (TCONX_RSP *) smb_buffer_response;
3741
3742 pSMB->AndXCommand = 0xFF;
3743 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3744 bcc_ptr = &pSMB->Password[0];
3745 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3746 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3747 *bcc_ptr = 0; /* password is null byte */
3748 bcc_ptr++; /* skip password */
3749 /* already aligned so no need to do it below */
3750 } else {
3751 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3752 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3753 specified as required (when that support is added to
3754 the vfs in the future) as only NTLM or the much
3755 weaker LANMAN (which we do not send by default) is accepted
3756 by Samba (not sure whether other servers allow
3757 NTLMv2 password here) */
3758 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3759 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3760 (ses->server->secType == LANMAN))
3761 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3762 ses->server->sec_mode &
3763 SECMODE_PW_ENCRYPT ? true : false,
3764 bcc_ptr);
3765 else
3766 #endif /* CIFS_WEAK_PW_HASH */
3767 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3768 bcc_ptr, nls_codepage);
3769
3770 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3771 if (ses->capabilities & CAP_UNICODE) {
3772 /* must align unicode strings */
3773 *bcc_ptr = 0; /* null byte password */
3774 bcc_ptr++;
3775 }
3776 }
3777
3778 if (ses->server->sec_mode &
3779 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3780 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3781
3782 if (ses->capabilities & CAP_STATUS32) {
3783 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3784 }
3785 if (ses->capabilities & CAP_DFS) {
3786 smb_buffer->Flags2 |= SMBFLG2_DFS;
3787 }
3788 if (ses->capabilities & CAP_UNICODE) {
3789 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3790 length =
3791 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3792 6 /* max utf8 char length in bytes */ *
3793 (/* server len*/ + 256 /* share len */), nls_codepage);
3794 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3795 bcc_ptr += 2; /* skip trailing null */
3796 } else { /* ASCII */
3797 strcpy(bcc_ptr, tree);
3798 bcc_ptr += strlen(tree) + 1;
3799 }
3800 strcpy(bcc_ptr, "?????");
3801 bcc_ptr += strlen("?????");
3802 bcc_ptr += 1;
3803 count = bcc_ptr - &pSMB->Password[0];
3804 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3805 pSMB->hdr.smb_buf_length) + count);
3806 pSMB->ByteCount = cpu_to_le16(count);
3807
3808 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3809 0);
3810
3811 /* above now done in SendReceive */
3812 if ((rc == 0) && (tcon != NULL)) {
3813 bool is_unicode;
3814
3815 tcon->tidStatus = CifsGood;
3816 tcon->need_reconnect = false;
3817 tcon->tid = smb_buffer_response->Tid;
3818 bcc_ptr = pByteArea(smb_buffer_response);
3819 bytes_left = get_bcc(smb_buffer_response);
3820 length = strnlen(bcc_ptr, bytes_left - 2);
3821 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3822 is_unicode = true;
3823 else
3824 is_unicode = false;
3825
3826
3827 /* skip service field (NB: this field is always ASCII) */
3828 if (length == 3) {
3829 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3830 (bcc_ptr[2] == 'C')) {
3831 cifs_dbg(FYI, "IPC connection\n");
3832 tcon->ipc = 1;
3833 }
3834 } else if (length == 2) {
3835 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3836 /* the most common case */
3837 cifs_dbg(FYI, "disk share connection\n");
3838 }
3839 }
3840 bcc_ptr += length + 1;
3841 bytes_left -= (length + 1);
3842 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3843
3844 /* mostly informational -- no need to fail on error here */
3845 kfree(tcon->nativeFileSystem);
3846 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3847 bytes_left, is_unicode,
3848 nls_codepage);
3849
3850 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3851
3852 if ((smb_buffer_response->WordCount == 3) ||
3853 (smb_buffer_response->WordCount == 7))
3854 /* field is in same location */
3855 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3856 else
3857 tcon->Flags = 0;
3858 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3859 } else if ((rc == 0) && tcon == NULL) {
3860 /* all we need to save for IPC$ connection */
3861 ses->ipc_tid = smb_buffer_response->Tid;
3862 }
3863
3864 cifs_buf_release(smb_buffer);
3865 return rc;
3866 }
3867
3868 void
3869 cifs_umount(struct cifs_sb_info *cifs_sb)
3870 {
3871 struct rb_root *root = &cifs_sb->tlink_tree;
3872 struct rb_node *node;
3873 struct tcon_link *tlink;
3874
3875 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3876
3877 spin_lock(&cifs_sb->tlink_tree_lock);
3878 while ((node = rb_first(root))) {
3879 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3880 cifs_get_tlink(tlink);
3881 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3882 rb_erase(node, root);
3883
3884 spin_unlock(&cifs_sb->tlink_tree_lock);
3885 cifs_put_tlink(tlink);
3886 spin_lock(&cifs_sb->tlink_tree_lock);
3887 }
3888 spin_unlock(&cifs_sb->tlink_tree_lock);
3889
3890 bdi_destroy(&cifs_sb->bdi);
3891 kfree(cifs_sb->mountdata);
3892 kfree(cifs_sb->prepath);
3893 unload_nls(cifs_sb->local_nls);
3894 kfree(cifs_sb);
3895 }
3896
3897 int
3898 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3899 {
3900 int rc = 0;
3901 struct TCP_Server_Info *server = ses->server;
3902
3903 if (!server->ops->need_neg || !server->ops->negotiate)
3904 return -ENOSYS;
3905
3906 /* only send once per connect */
3907 if (!server->ops->need_neg(server))
3908 return 0;
3909
3910 set_credits(server, 1);
3911
3912 rc = server->ops->negotiate(xid, ses);
3913 if (rc == 0) {
3914 spin_lock(&GlobalMid_Lock);
3915 if (server->tcpStatus == CifsNeedNegotiate)
3916 server->tcpStatus = CifsGood;
3917 else
3918 rc = -EHOSTDOWN;
3919 spin_unlock(&GlobalMid_Lock);
3920 }
3921
3922 return rc;
3923 }
3924
3925 int
3926 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3927 struct nls_table *nls_info)
3928 {
3929 int rc = -ENOSYS;
3930 struct TCP_Server_Info *server = ses->server;
3931
3932 ses->flags = 0;
3933 ses->capabilities = server->capabilities;
3934 if (linuxExtEnabled == 0)
3935 ses->capabilities &= (~server->vals->cap_unix);
3936
3937 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3938 server->sec_mode, server->capabilities, server->timeAdj);
3939
3940 if (server->ops->sess_setup)
3941 rc = server->ops->sess_setup(xid, ses, nls_info);
3942
3943 if (rc) {
3944 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3945 } else {
3946 mutex_lock(&server->srv_mutex);
3947 if (!server->session_estab) {
3948 server->session_key.response = ses->auth_key.response;
3949 server->session_key.len = ses->auth_key.len;
3950 server->sequence_number = 0x2;
3951 server->session_estab = true;
3952 ses->auth_key.response = NULL;
3953 }
3954 mutex_unlock(&server->srv_mutex);
3955
3956 cifs_dbg(FYI, "CIFS Session Established successfully\n");
3957 spin_lock(&GlobalMid_Lock);
3958 ses->status = CifsGood;
3959 ses->need_reconnect = false;
3960 spin_unlock(&GlobalMid_Lock);
3961 }
3962
3963 kfree(ses->auth_key.response);
3964 ses->auth_key.response = NULL;
3965 ses->auth_key.len = 0;
3966 kfree(ses->ntlmssp);
3967 ses->ntlmssp = NULL;
3968
3969 return rc;
3970 }
3971
3972 static int
3973 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3974 {
3975 switch (ses->server->secType) {
3976 case Kerberos:
3977 vol->secFlg = CIFSSEC_MUST_KRB5;
3978 return 0;
3979 case NTLMv2:
3980 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3981 break;
3982 case NTLM:
3983 vol->secFlg = CIFSSEC_MUST_NTLM;
3984 break;
3985 case RawNTLMSSP:
3986 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3987 break;
3988 case LANMAN:
3989 vol->secFlg = CIFSSEC_MUST_LANMAN;
3990 break;
3991 }
3992
3993 return cifs_set_cifscreds(vol, ses);
3994 }
3995
3996 static struct cifs_tcon *
3997 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3998 {
3999 int rc;
4000 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4001 struct cifs_ses *ses;
4002 struct cifs_tcon *tcon = NULL;
4003 struct smb_vol *vol_info;
4004
4005 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4006 if (vol_info == NULL)
4007 return ERR_PTR(-ENOMEM);
4008
4009 vol_info->local_nls = cifs_sb->local_nls;
4010 vol_info->linux_uid = fsuid;
4011 vol_info->cred_uid = fsuid;
4012 vol_info->UNC = master_tcon->treeName;
4013 vol_info->retry = master_tcon->retry;
4014 vol_info->nocase = master_tcon->nocase;
4015 vol_info->local_lease = master_tcon->local_lease;
4016 vol_info->no_linux_ext = !master_tcon->unix_ext;
4017
4018 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4019 if (rc) {
4020 tcon = ERR_PTR(rc);
4021 goto out;
4022 }
4023
4024 /* get a reference for the same TCP session */
4025 spin_lock(&cifs_tcp_ses_lock);
4026 ++master_tcon->ses->server->srv_count;
4027 spin_unlock(&cifs_tcp_ses_lock);
4028
4029 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4030 if (IS_ERR(ses)) {
4031 tcon = (struct cifs_tcon *)ses;
4032 cifs_put_tcp_session(master_tcon->ses->server, 0);
4033 goto out;
4034 }
4035
4036 tcon = cifs_get_tcon(ses, vol_info);
4037 if (IS_ERR(tcon)) {
4038 cifs_put_smb_ses(ses);
4039 goto out;
4040 }
4041
4042 if (cap_unix(ses))
4043 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4044 out:
4045 kfree(vol_info->username);
4046 kfree(vol_info->password);
4047 kfree(vol_info);
4048
4049 return tcon;
4050 }
4051
4052 struct cifs_tcon *
4053 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4054 {
4055 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4056 }
4057
4058 static int
4059 cifs_sb_tcon_pending_wait(void *unused)
4060 {
4061 schedule();
4062 return signal_pending(current) ? -ERESTARTSYS : 0;
4063 }
4064
4065 /* find and return a tlink with given uid */
4066 static struct tcon_link *
4067 tlink_rb_search(struct rb_root *root, kuid_t uid)
4068 {
4069 struct rb_node *node = root->rb_node;
4070 struct tcon_link *tlink;
4071
4072 while (node) {
4073 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4074
4075 if (uid_gt(tlink->tl_uid, uid))
4076 node = node->rb_left;
4077 else if (uid_lt(tlink->tl_uid, uid))
4078 node = node->rb_right;
4079 else
4080 return tlink;
4081 }
4082 return NULL;
4083 }
4084
4085 /* insert a tcon_link into the tree */
4086 static void
4087 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4088 {
4089 struct rb_node **new = &(root->rb_node), *parent = NULL;
4090 struct tcon_link *tlink;
4091
4092 while (*new) {
4093 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4094 parent = *new;
4095
4096 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4097 new = &((*new)->rb_left);
4098 else
4099 new = &((*new)->rb_right);
4100 }
4101
4102 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4103 rb_insert_color(&new_tlink->tl_rbnode, root);
4104 }
4105
4106 /*
4107 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4108 * current task.
4109 *
4110 * If the superblock doesn't refer to a multiuser mount, then just return
4111 * the master tcon for the mount.
4112 *
4113 * First, search the rbtree for an existing tcon for this fsuid. If one
4114 * exists, then check to see if it's pending construction. If it is then wait
4115 * for construction to complete. Once it's no longer pending, check to see if
4116 * it failed and either return an error or retry construction, depending on
4117 * the timeout.
4118 *
4119 * If one doesn't exist then insert a new tcon_link struct into the tree and
4120 * try to construct a new one.
4121 */
4122 struct tcon_link *
4123 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4124 {
4125 int ret;
4126 kuid_t fsuid = current_fsuid();
4127 struct tcon_link *tlink, *newtlink;
4128
4129 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4130 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4131
4132 spin_lock(&cifs_sb->tlink_tree_lock);
4133 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4134 if (tlink)
4135 cifs_get_tlink(tlink);
4136 spin_unlock(&cifs_sb->tlink_tree_lock);
4137
4138 if (tlink == NULL) {
4139 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4140 if (newtlink == NULL)
4141 return ERR_PTR(-ENOMEM);
4142 newtlink->tl_uid = fsuid;
4143 newtlink->tl_tcon = ERR_PTR(-EACCES);
4144 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4145 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4146 cifs_get_tlink(newtlink);
4147
4148 spin_lock(&cifs_sb->tlink_tree_lock);
4149 /* was one inserted after previous search? */
4150 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4151 if (tlink) {
4152 cifs_get_tlink(tlink);
4153 spin_unlock(&cifs_sb->tlink_tree_lock);
4154 kfree(newtlink);
4155 goto wait_for_construction;
4156 }
4157 tlink = newtlink;
4158 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4159 spin_unlock(&cifs_sb->tlink_tree_lock);
4160 } else {
4161 wait_for_construction:
4162 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4163 cifs_sb_tcon_pending_wait,
4164 TASK_INTERRUPTIBLE);
4165 if (ret) {
4166 cifs_put_tlink(tlink);
4167 return ERR_PTR(ret);
4168 }
4169
4170 /* if it's good, return it */
4171 if (!IS_ERR(tlink->tl_tcon))
4172 return tlink;
4173
4174 /* return error if we tried this already recently */
4175 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4176 cifs_put_tlink(tlink);
4177 return ERR_PTR(-EACCES);
4178 }
4179
4180 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4181 goto wait_for_construction;
4182 }
4183
4184 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4185 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4186 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4187
4188 if (IS_ERR(tlink->tl_tcon)) {
4189 cifs_put_tlink(tlink);
4190 return ERR_PTR(-EACCES);
4191 }
4192
4193 return tlink;
4194 }
4195
4196 /*
4197 * periodic workqueue job that scans tcon_tree for a superblock and closes
4198 * out tcons.
4199 */
4200 static void
4201 cifs_prune_tlinks(struct work_struct *work)
4202 {
4203 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4204 prune_tlinks.work);
4205 struct rb_root *root = &cifs_sb->tlink_tree;
4206 struct rb_node *node = rb_first(root);
4207 struct rb_node *tmp;
4208 struct tcon_link *tlink;
4209
4210 /*
4211 * Because we drop the spinlock in the loop in order to put the tlink
4212 * it's not guarded against removal of links from the tree. The only
4213 * places that remove entries from the tree are this function and
4214 * umounts. Because this function is non-reentrant and is canceled
4215 * before umount can proceed, this is safe.
4216 */
4217 spin_lock(&cifs_sb->tlink_tree_lock);
4218 node = rb_first(root);
4219 while (node != NULL) {
4220 tmp = node;
4221 node = rb_next(tmp);
4222 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4223
4224 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4225 atomic_read(&tlink->tl_count) != 0 ||
4226 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4227 continue;
4228
4229 cifs_get_tlink(tlink);
4230 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4231 rb_erase(tmp, root);
4232
4233 spin_unlock(&cifs_sb->tlink_tree_lock);
4234 cifs_put_tlink(tlink);
4235 spin_lock(&cifs_sb->tlink_tree_lock);
4236 }
4237 spin_unlock(&cifs_sb->tlink_tree_lock);
4238
4239 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4240 TLINK_IDLE_EXPIRE);
4241 }
kernel source for telekom puls (alcatel/mediatek)