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ece9071ec78bc93b54e2ec481f6cb2b63e17bd91
[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 int
2739 cifs_match_super(struct super_block *sb, void *data)
2740 {
2741 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2742 struct smb_vol *volume_info;
2743 struct cifs_sb_info *cifs_sb;
2744 struct TCP_Server_Info *tcp_srv;
2745 struct cifs_ses *ses;
2746 struct cifs_tcon *tcon;
2747 struct tcon_link *tlink;
2748 int rc = 0;
2749
2750 spin_lock(&cifs_tcp_ses_lock);
2751 cifs_sb = CIFS_SB(sb);
2752 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2753 if (IS_ERR(tlink)) {
2754 spin_unlock(&cifs_tcp_ses_lock);
2755 return rc;
2756 }
2757 tcon = tlink_tcon(tlink);
2758 ses = tcon->ses;
2759 tcp_srv = ses->server;
2760
2761 volume_info = mnt_data->vol;
2762
2763 if (!match_server(tcp_srv, volume_info) ||
2764 !match_session(ses, volume_info) ||
2765 !match_tcon(tcon, volume_info->UNC)) {
2766 rc = 0;
2767 goto out;
2768 }
2769
2770 rc = compare_mount_options(sb, mnt_data);
2771 out:
2772 spin_unlock(&cifs_tcp_ses_lock);
2773 cifs_put_tlink(tlink);
2774 return rc;
2775 }
2776
2777 int
2778 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2779 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2780 struct dfs_info3_param **referrals, int remap)
2781 {
2782 char *temp_unc;
2783 int rc = 0;
2784
2785 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2786 return -ENOSYS;
2787
2788 *num_referrals = 0;
2789 *referrals = NULL;
2790
2791 if (ses->ipc_tid == 0) {
2792 temp_unc = kmalloc(2 /* for slashes */ +
2793 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2794 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2795 if (temp_unc == NULL)
2796 return -ENOMEM;
2797 temp_unc[0] = '\\';
2798 temp_unc[1] = '\\';
2799 strcpy(temp_unc + 2, ses->serverName);
2800 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2801 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2802 nls_codepage);
2803 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2804 kfree(temp_unc);
2805 }
2806 if (rc == 0)
2807 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2808 referrals, num_referrals,
2809 nls_codepage, remap);
2810 /*
2811 * BB - map targetUNCs to dfs_info3 structures, here or in
2812 * ses->server->ops->get_dfs_refer.
2813 */
2814
2815 return rc;
2816 }
2817
2818 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2819 static struct lock_class_key cifs_key[2];
2820 static struct lock_class_key cifs_slock_key[2];
2821
2822 static inline void
2823 cifs_reclassify_socket4(struct socket *sock)
2824 {
2825 struct sock *sk = sock->sk;
2826 BUG_ON(sock_owned_by_user(sk));
2827 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2828 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2829 }
2830
2831 static inline void
2832 cifs_reclassify_socket6(struct socket *sock)
2833 {
2834 struct sock *sk = sock->sk;
2835 BUG_ON(sock_owned_by_user(sk));
2836 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2837 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2838 }
2839 #else
2840 static inline void
2841 cifs_reclassify_socket4(struct socket *sock)
2842 {
2843 }
2844
2845 static inline void
2846 cifs_reclassify_socket6(struct socket *sock)
2847 {
2848 }
2849 #endif
2850
2851 /* See RFC1001 section 14 on representation of Netbios names */
2852 static void rfc1002mangle(char *target, char *source, unsigned int length)
2853 {
2854 unsigned int i, j;
2855
2856 for (i = 0, j = 0; i < (length); i++) {
2857 /* mask a nibble at a time and encode */
2858 target[j] = 'A' + (0x0F & (source[i] >> 4));
2859 target[j+1] = 'A' + (0x0F & source[i]);
2860 j += 2;
2861 }
2862
2863 }
2864
2865 static int
2866 bind_socket(struct TCP_Server_Info *server)
2867 {
2868 int rc = 0;
2869 if (server->srcaddr.ss_family != AF_UNSPEC) {
2870 /* Bind to the specified local IP address */
2871 struct socket *socket = server->ssocket;
2872 rc = socket->ops->bind(socket,
2873 (struct sockaddr *) &server->srcaddr,
2874 sizeof(server->srcaddr));
2875 if (rc < 0) {
2876 struct sockaddr_in *saddr4;
2877 struct sockaddr_in6 *saddr6;
2878 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2879 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2880 if (saddr6->sin6_family == AF_INET6)
2881 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2882 &saddr6->sin6_addr, rc);
2883 else
2884 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2885 &saddr4->sin_addr.s_addr, rc);
2886 }
2887 }
2888 return rc;
2889 }
2890
2891 static int
2892 ip_rfc1001_connect(struct TCP_Server_Info *server)
2893 {
2894 int rc = 0;
2895 /*
2896 * some servers require RFC1001 sessinit before sending
2897 * negprot - BB check reconnection in case where second
2898 * sessinit is sent but no second negprot
2899 */
2900 struct rfc1002_session_packet *ses_init_buf;
2901 struct smb_hdr *smb_buf;
2902 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2903 GFP_KERNEL);
2904 if (ses_init_buf) {
2905 ses_init_buf->trailer.session_req.called_len = 32;
2906
2907 if (server->server_RFC1001_name &&
2908 server->server_RFC1001_name[0] != 0)
2909 rfc1002mangle(ses_init_buf->trailer.
2910 session_req.called_name,
2911 server->server_RFC1001_name,
2912 RFC1001_NAME_LEN_WITH_NULL);
2913 else
2914 rfc1002mangle(ses_init_buf->trailer.
2915 session_req.called_name,
2916 DEFAULT_CIFS_CALLED_NAME,
2917 RFC1001_NAME_LEN_WITH_NULL);
2918
2919 ses_init_buf->trailer.session_req.calling_len = 32;
2920
2921 /*
2922 * calling name ends in null (byte 16) from old smb
2923 * convention.
2924 */
2925 if (server->workstation_RFC1001_name &&
2926 server->workstation_RFC1001_name[0] != 0)
2927 rfc1002mangle(ses_init_buf->trailer.
2928 session_req.calling_name,
2929 server->workstation_RFC1001_name,
2930 RFC1001_NAME_LEN_WITH_NULL);
2931 else
2932 rfc1002mangle(ses_init_buf->trailer.
2933 session_req.calling_name,
2934 "LINUX_CIFS_CLNT",
2935 RFC1001_NAME_LEN_WITH_NULL);
2936
2937 ses_init_buf->trailer.session_req.scope1 = 0;
2938 ses_init_buf->trailer.session_req.scope2 = 0;
2939 smb_buf = (struct smb_hdr *)ses_init_buf;
2940
2941 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2942 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2943 rc = smb_send(server, smb_buf, 0x44);
2944 kfree(ses_init_buf);
2945 /*
2946 * RFC1001 layer in at least one server
2947 * requires very short break before negprot
2948 * presumably because not expecting negprot
2949 * to follow so fast. This is a simple
2950 * solution that works without
2951 * complicating the code and causes no
2952 * significant slowing down on mount
2953 * for everyone else
2954 */
2955 usleep_range(1000, 2000);
2956 }
2957 /*
2958 * else the negprot may still work without this
2959 * even though malloc failed
2960 */
2961
2962 return rc;
2963 }
2964
2965 static int
2966 generic_ip_connect(struct TCP_Server_Info *server)
2967 {
2968 int rc = 0;
2969 __be16 sport;
2970 int slen, sfamily;
2971 struct socket *socket = server->ssocket;
2972 struct sockaddr *saddr;
2973
2974 saddr = (struct sockaddr *) &server->dstaddr;
2975
2976 if (server->dstaddr.ss_family == AF_INET6) {
2977 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2978 slen = sizeof(struct sockaddr_in6);
2979 sfamily = AF_INET6;
2980 } else {
2981 sport = ((struct sockaddr_in *) saddr)->sin_port;
2982 slen = sizeof(struct sockaddr_in);
2983 sfamily = AF_INET;
2984 }
2985
2986 if (socket == NULL) {
2987 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2988 IPPROTO_TCP, &socket, 1);
2989 if (rc < 0) {
2990 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2991 server->ssocket = NULL;
2992 return rc;
2993 }
2994
2995 /* BB other socket options to set KEEPALIVE, NODELAY? */
2996 cifs_dbg(FYI, "Socket created\n");
2997 server->ssocket = socket;
2998 socket->sk->sk_allocation = GFP_NOFS;
2999 if (sfamily == AF_INET6)
3000 cifs_reclassify_socket6(socket);
3001 else
3002 cifs_reclassify_socket4(socket);
3003 }
3004
3005 rc = bind_socket(server);
3006 if (rc < 0)
3007 return rc;
3008
3009 /*
3010 * Eventually check for other socket options to change from
3011 * the default. sock_setsockopt not used because it expects
3012 * user space buffer
3013 */
3014 socket->sk->sk_rcvtimeo = 7 * HZ;
3015 socket->sk->sk_sndtimeo = 5 * HZ;
3016
3017 /* make the bufsizes depend on wsize/rsize and max requests */
3018 if (server->noautotune) {
3019 if (socket->sk->sk_sndbuf < (200 * 1024))
3020 socket->sk->sk_sndbuf = 200 * 1024;
3021 if (socket->sk->sk_rcvbuf < (140 * 1024))
3022 socket->sk->sk_rcvbuf = 140 * 1024;
3023 }
3024
3025 if (server->tcp_nodelay) {
3026 int val = 1;
3027 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3028 (char *)&val, sizeof(val));
3029 if (rc)
3030 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3031 rc);
3032 }
3033
3034 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3035 socket->sk->sk_sndbuf,
3036 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3037
3038 rc = socket->ops->connect(socket, saddr, slen, 0);
3039 if (rc < 0) {
3040 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3041 sock_release(socket);
3042 server->ssocket = NULL;
3043 return rc;
3044 }
3045
3046 if (sport == htons(RFC1001_PORT))
3047 rc = ip_rfc1001_connect(server);
3048
3049 return rc;
3050 }
3051
3052 static int
3053 ip_connect(struct TCP_Server_Info *server)
3054 {
3055 __be16 *sport;
3056 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3057 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3058
3059 if (server->dstaddr.ss_family == AF_INET6)
3060 sport = &addr6->sin6_port;
3061 else
3062 sport = &addr->sin_port;
3063
3064 if (*sport == 0) {
3065 int rc;
3066
3067 /* try with 445 port at first */
3068 *sport = htons(CIFS_PORT);
3069
3070 rc = generic_ip_connect(server);
3071 if (rc >= 0)
3072 return rc;
3073
3074 /* if it failed, try with 139 port */
3075 *sport = htons(RFC1001_PORT);
3076 }
3077
3078 return generic_ip_connect(server);
3079 }
3080
3081 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3082 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3083 {
3084 /* if we are reconnecting then should we check to see if
3085 * any requested capabilities changed locally e.g. via
3086 * remount but we can not do much about it here
3087 * if they have (even if we could detect it by the following)
3088 * Perhaps we could add a backpointer to array of sb from tcon
3089 * or if we change to make all sb to same share the same
3090 * sb as NFS - then we only have one backpointer to sb.
3091 * What if we wanted to mount the server share twice once with
3092 * and once without posixacls or posix paths? */
3093 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3094
3095 if (vol_info && vol_info->no_linux_ext) {
3096 tcon->fsUnixInfo.Capability = 0;
3097 tcon->unix_ext = 0; /* Unix Extensions disabled */
3098 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3099 return;
3100 } else if (vol_info)
3101 tcon->unix_ext = 1; /* Unix Extensions supported */
3102
3103 if (tcon->unix_ext == 0) {
3104 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3105 return;
3106 }
3107
3108 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3109 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3110 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3111 /* check for reconnect case in which we do not
3112 want to change the mount behavior if we can avoid it */
3113 if (vol_info == NULL) {
3114 /* turn off POSIX ACL and PATHNAMES if not set
3115 originally at mount time */
3116 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3117 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3118 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3119 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3120 cifs_dbg(VFS, "POSIXPATH support change\n");
3121 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3122 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3123 cifs_dbg(VFS, "possible reconnect error\n");
3124 cifs_dbg(VFS, "server disabled POSIX path support\n");
3125 }
3126 }
3127
3128 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3129 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3130
3131 cap &= CIFS_UNIX_CAP_MASK;
3132 if (vol_info && vol_info->no_psx_acl)
3133 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3134 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3135 cifs_dbg(FYI, "negotiated posix acl support\n");
3136 if (cifs_sb)
3137 cifs_sb->mnt_cifs_flags |=
3138 CIFS_MOUNT_POSIXACL;
3139 }
3140
3141 if (vol_info && vol_info->posix_paths == 0)
3142 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3143 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3144 cifs_dbg(FYI, "negotiate posix pathnames\n");
3145 if (cifs_sb)
3146 cifs_sb->mnt_cifs_flags |=
3147 CIFS_MOUNT_POSIX_PATHS;
3148 }
3149
3150 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3151 #ifdef CONFIG_CIFS_DEBUG2
3152 if (cap & CIFS_UNIX_FCNTL_CAP)
3153 cifs_dbg(FYI, "FCNTL cap\n");
3154 if (cap & CIFS_UNIX_EXTATTR_CAP)
3155 cifs_dbg(FYI, "EXTATTR cap\n");
3156 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3157 cifs_dbg(FYI, "POSIX path cap\n");
3158 if (cap & CIFS_UNIX_XATTR_CAP)
3159 cifs_dbg(FYI, "XATTR cap\n");
3160 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3161 cifs_dbg(FYI, "POSIX ACL cap\n");
3162 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3163 cifs_dbg(FYI, "very large read cap\n");
3164 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3165 cifs_dbg(FYI, "very large write cap\n");
3166 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3167 cifs_dbg(FYI, "transport encryption cap\n");
3168 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3169 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3170 #endif /* CIFS_DEBUG2 */
3171 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3172 if (vol_info == NULL) {
3173 cifs_dbg(FYI, "resetting capabilities failed\n");
3174 } else
3175 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");
3176
3177 }
3178 }
3179 }
3180
3181 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3182 struct cifs_sb_info *cifs_sb)
3183 {
3184 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3185
3186 spin_lock_init(&cifs_sb->tlink_tree_lock);
3187 cifs_sb->tlink_tree = RB_ROOT;
3188
3189 /*
3190 * Temporarily set r/wsize for matching superblock. If we end up using
3191 * new sb then client will later negotiate it downward if needed.
3192 */
3193 cifs_sb->rsize = pvolume_info->rsize;
3194 cifs_sb->wsize = pvolume_info->wsize;
3195
3196 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3197 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3198 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3199 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3200 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3201 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3202
3203 cifs_sb->actimeo = pvolume_info->actimeo;
3204 cifs_sb->local_nls = pvolume_info->local_nls;
3205
3206 if (pvolume_info->noperm)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3208 if (pvolume_info->setuids)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3210 if (pvolume_info->server_ino)
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3212 if (pvolume_info->remap)
3213 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3214 if (pvolume_info->no_xattr)
3215 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3216 if (pvolume_info->sfu_emul)
3217 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3218 if (pvolume_info->nobrl)
3219 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3220 if (pvolume_info->nostrictsync)
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3222 if (pvolume_info->mand_lock)
3223 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3224 if (pvolume_info->rwpidforward)
3225 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3226 if (pvolume_info->cifs_acl)
3227 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3228 if (pvolume_info->backupuid_specified) {
3229 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3230 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3231 }
3232 if (pvolume_info->backupgid_specified) {
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3234 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3235 }
3236 if (pvolume_info->override_uid)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3238 if (pvolume_info->override_gid)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3240 if (pvolume_info->dynperm)
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3242 if (pvolume_info->fsc)
3243 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3244 if (pvolume_info->multiuser)
3245 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3246 CIFS_MOUNT_NO_PERM);
3247 if (pvolume_info->strict_io)
3248 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3249 if (pvolume_info->direct_io) {
3250 cifs_dbg(FYI, "mounting share using direct i/o\n");
3251 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3252 }
3253 if (pvolume_info->mfsymlinks) {
3254 if (pvolume_info->sfu_emul) {
3255 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3256 } else {
3257 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3258 }
3259 }
3260
3261 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3262 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3263 }
3264
3265 static void
3266 cleanup_volume_info_contents(struct smb_vol *volume_info)
3267 {
3268 kfree(volume_info->username);
3269 kzfree(volume_info->password);
3270 kfree(volume_info->UNC);
3271 kfree(volume_info->domainname);
3272 kfree(volume_info->iocharset);
3273 kfree(volume_info->prepath);
3274 }
3275
3276 void
3277 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3278 {
3279 if (!volume_info)
3280 return;
3281 cleanup_volume_info_contents(volume_info);
3282 kfree(volume_info);
3283 }
3284
3285
3286 #ifdef CONFIG_CIFS_DFS_UPCALL
3287 /*
3288 * cifs_build_path_to_root returns full path to root when we do not have an
3289 * exiting connection (tcon)
3290 */
3291 static char *
3292 build_unc_path_to_root(const struct smb_vol *vol,
3293 const struct cifs_sb_info *cifs_sb)
3294 {
3295 char *full_path, *pos;
3296 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3297 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3298
3299 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3300 if (full_path == NULL)
3301 return ERR_PTR(-ENOMEM);
3302
3303 strncpy(full_path, vol->UNC, unc_len);
3304 pos = full_path + unc_len;
3305
3306 if (pplen) {
3307 *pos = CIFS_DIR_SEP(cifs_sb);
3308 strncpy(pos + 1, vol->prepath, pplen);
3309 pos += pplen;
3310 }
3311
3312 *pos = '\0'; /* add trailing null */
3313 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3314 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3315 return full_path;
3316 }
3317
3318 /*
3319 * Perform a dfs referral query for a share and (optionally) prefix
3320 *
3321 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3322 * to a string containing updated options for the submount. Otherwise it
3323 * will be left untouched.
3324 *
3325 * Returns the rc from get_dfs_path to the caller, which can be used to
3326 * determine whether there were referrals.
3327 */
3328 static int
3329 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3330 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3331 int check_prefix)
3332 {
3333 int rc;
3334 unsigned int num_referrals = 0;
3335 struct dfs_info3_param *referrals = NULL;
3336 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3337
3338 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3339 if (IS_ERR(full_path))
3340 return PTR_ERR(full_path);
3341
3342 /* For DFS paths, skip the first '\' of the UNC */
3343 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3344
3345 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3346 &num_referrals, &referrals,
3347 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3348
3349 if (!rc && num_referrals > 0) {
3350 char *fake_devname = NULL;
3351
3352 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3353 full_path + 1, referrals,
3354 &fake_devname);
3355
3356 free_dfs_info_array(referrals, num_referrals);
3357
3358 if (IS_ERR(mdata)) {
3359 rc = PTR_ERR(mdata);
3360 mdata = NULL;
3361 } else {
3362 cleanup_volume_info_contents(volume_info);
3363 rc = cifs_setup_volume_info(volume_info, mdata,
3364 fake_devname);
3365 }
3366 kfree(fake_devname);
3367 kfree(cifs_sb->mountdata);
3368 cifs_sb->mountdata = mdata;
3369 }
3370 kfree(full_path);
3371 return rc;
3372 }
3373 #endif
3374
3375 static int
3376 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3377 const char *devname)
3378 {
3379 int rc = 0;
3380
3381 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3382 return -EINVAL;
3383
3384 if (volume_info->nullauth) {
3385 cifs_dbg(FYI, "Anonymous login\n");
3386 kfree(volume_info->username);
3387 volume_info->username = NULL;
3388 } else if (volume_info->username) {
3389 /* BB fixme parse for domain name here */
3390 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3391 } else {
3392 cifs_dbg(VFS, "No username specified\n");
3393 /* In userspace mount helper we can get user name from alternate
3394 locations such as env variables and files on disk */
3395 return -EINVAL;
3396 }
3397
3398 /* this is needed for ASCII cp to Unicode converts */
3399 if (volume_info->iocharset == NULL) {
3400 /* load_nls_default cannot return null */
3401 volume_info->local_nls = load_nls_default();
3402 } else {
3403 volume_info->local_nls = load_nls(volume_info->iocharset);
3404 if (volume_info->local_nls == NULL) {
3405 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3406 volume_info->iocharset);
3407 return -ELIBACC;
3408 }
3409 }
3410
3411 return rc;
3412 }
3413
3414 struct smb_vol *
3415 cifs_get_volume_info(char *mount_data, const char *devname)
3416 {
3417 int rc;
3418 struct smb_vol *volume_info;
3419
3420 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3421 if (!volume_info)
3422 return ERR_PTR(-ENOMEM);
3423
3424 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3425 if (rc) {
3426 cifs_cleanup_volume_info(volume_info);
3427 volume_info = ERR_PTR(rc);
3428 }
3429
3430 return volume_info;
3431 }
3432
3433 static int
3434 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3435 unsigned int xid,
3436 struct cifs_tcon *tcon,
3437 struct cifs_sb_info *cifs_sb,
3438 char *full_path)
3439 {
3440 int rc;
3441 char *s;
3442 char sep, tmp;
3443
3444 sep = CIFS_DIR_SEP(cifs_sb);
3445 s = full_path;
3446
3447 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3448 while (rc == 0) {
3449 /* skip separators */
3450 while (*s == sep)
3451 s++;
3452 if (!*s)
3453 break;
3454 /* next separator */
3455 while (*s && *s != sep)
3456 s++;
3457
3458 /*
3459 * temporarily null-terminate the path at the end of
3460 * the current component
3461 */
3462 tmp = *s;
3463 *s = 0;
3464 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3465 full_path);
3466 *s = tmp;
3467 }
3468 return rc;
3469 }
3470
3471 int
3472 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3473 {
3474 int rc;
3475 unsigned int xid;
3476 struct cifs_ses *ses;
3477 struct cifs_tcon *tcon;
3478 struct TCP_Server_Info *server;
3479 char *full_path;
3480 struct tcon_link *tlink;
3481 #ifdef CONFIG_CIFS_DFS_UPCALL
3482 int referral_walks_count = 0;
3483 #endif
3484
3485 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3486 if (rc)
3487 return rc;
3488
3489 #ifdef CONFIG_CIFS_DFS_UPCALL
3490 try_mount_again:
3491 /* cleanup activities if we're chasing a referral */
3492 if (referral_walks_count) {
3493 if (tcon)
3494 cifs_put_tcon(tcon);
3495 else if (ses)
3496 cifs_put_smb_ses(ses);
3497
3498 free_xid(xid);
3499 }
3500 #endif
3501 rc = 0;
3502 tcon = NULL;
3503 ses = NULL;
3504 server = NULL;
3505 full_path = NULL;
3506 tlink = NULL;
3507
3508 xid = get_xid();
3509
3510 /* get a reference to a tcp session */
3511 server = cifs_get_tcp_session(volume_info);
3512 if (IS_ERR(server)) {
3513 rc = PTR_ERR(server);
3514 bdi_destroy(&cifs_sb->bdi);
3515 goto out;
3516 }
3517
3518 /* get a reference to a SMB session */
3519 ses = cifs_get_smb_ses(server, volume_info);
3520 if (IS_ERR(ses)) {
3521 rc = PTR_ERR(ses);
3522 ses = NULL;
3523 goto mount_fail_check;
3524 }
3525
3526 /* search for existing tcon to this server share */
3527 tcon = cifs_get_tcon(ses, volume_info);
3528 if (IS_ERR(tcon)) {
3529 rc = PTR_ERR(tcon);
3530 tcon = NULL;
3531 goto remote_path_check;
3532 }
3533
3534 /* tell server which Unix caps we support */
3535 if (cap_unix(tcon->ses)) {
3536 /* reset of caps checks mount to see if unix extensions
3537 disabled for just this mount */
3538 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3539 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3540 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3541 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3542 rc = -EACCES;
3543 goto mount_fail_check;
3544 }
3545 } else
3546 tcon->unix_ext = 0; /* server does not support them */
3547
3548 /* do not care if a following call succeed - informational */
3549 if (!tcon->ipc && server->ops->qfs_tcon)
3550 server->ops->qfs_tcon(xid, tcon);
3551
3552 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3553 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3554
3555 /* tune readahead according to rsize */
3556 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3557
3558 remote_path_check:
3559 #ifdef CONFIG_CIFS_DFS_UPCALL
3560 /*
3561 * Perform an unconditional check for whether there are DFS
3562 * referrals for this path without prefix, to provide support
3563 * for DFS referrals from w2k8 servers which don't seem to respond
3564 * with PATH_NOT_COVERED to requests that include the prefix.
3565 * Chase the referral if found, otherwise continue normally.
3566 */
3567 if (referral_walks_count == 0) {
3568 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3569 false);
3570 if (!refrc) {
3571 referral_walks_count++;
3572 goto try_mount_again;
3573 }
3574 }
3575 #endif
3576
3577 /* check if a whole path is not remote */
3578 if (!rc && tcon) {
3579 if (!server->ops->is_path_accessible) {
3580 rc = -ENOSYS;
3581 goto mount_fail_check;
3582 }
3583 /*
3584 * cifs_build_path_to_root works only when we have a valid tcon
3585 */
3586 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3587 if (full_path == NULL) {
3588 rc = -ENOMEM;
3589 goto mount_fail_check;
3590 }
3591 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3592 full_path);
3593 if (rc != 0 && rc != -EREMOTE) {
3594 kfree(full_path);
3595 goto mount_fail_check;
3596 }
3597
3598 rc = cifs_are_all_path_components_accessible(server,
3599 xid, tcon, cifs_sb,
3600 full_path);
3601 if (rc != 0) {
3602 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3603 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3604 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3605 rc = 0;
3606 }
3607 kfree(full_path);
3608 }
3609
3610 /* get referral if needed */
3611 if (rc == -EREMOTE) {
3612 #ifdef CONFIG_CIFS_DFS_UPCALL
3613 if (referral_walks_count > MAX_NESTED_LINKS) {
3614 /*
3615 * BB: when we implement proper loop detection,
3616 * we will remove this check. But now we need it
3617 * to prevent an indefinite loop if 'DFS tree' is
3618 * misconfigured (i.e. has loops).
3619 */
3620 rc = -ELOOP;
3621 goto mount_fail_check;
3622 }
3623
3624 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3625
3626 if (!rc) {
3627 referral_walks_count++;
3628 goto try_mount_again;
3629 }
3630 goto mount_fail_check;
3631 #else /* No DFS support, return error on mount */
3632 rc = -EOPNOTSUPP;
3633 #endif
3634 }
3635
3636 if (rc)
3637 goto mount_fail_check;
3638
3639 /* now, hang the tcon off of the superblock */
3640 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3641 if (tlink == NULL) {
3642 rc = -ENOMEM;
3643 goto mount_fail_check;
3644 }
3645
3646 tlink->tl_uid = ses->linux_uid;
3647 tlink->tl_tcon = tcon;
3648 tlink->tl_time = jiffies;
3649 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3650 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3651
3652 cifs_sb->master_tlink = tlink;
3653 spin_lock(&cifs_sb->tlink_tree_lock);
3654 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3655 spin_unlock(&cifs_sb->tlink_tree_lock);
3656
3657 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3658 TLINK_IDLE_EXPIRE);
3659
3660 mount_fail_check:
3661 /* on error free sesinfo and tcon struct if needed */
3662 if (rc) {
3663 /* If find_unc succeeded then rc == 0 so we can not end */
3664 /* up accidentally freeing someone elses tcon struct */
3665 if (tcon)
3666 cifs_put_tcon(tcon);
3667 else if (ses)
3668 cifs_put_smb_ses(ses);
3669 else
3670 cifs_put_tcp_session(server, 0);
3671 bdi_destroy(&cifs_sb->bdi);
3672 }
3673
3674 out:
3675 free_xid(xid);
3676 return rc;
3677 }
3678
3679 /*
3680 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3681 * pointer may be NULL.
3682 */
3683 int
3684 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3685 const char *tree, struct cifs_tcon *tcon,
3686 const struct nls_table *nls_codepage)
3687 {
3688 struct smb_hdr *smb_buffer;
3689 struct smb_hdr *smb_buffer_response;
3690 TCONX_REQ *pSMB;
3691 TCONX_RSP *pSMBr;
3692 unsigned char *bcc_ptr;
3693 int rc = 0;
3694 int length;
3695 __u16 bytes_left, count;
3696
3697 if (ses == NULL)
3698 return -EIO;
3699
3700 smb_buffer = cifs_buf_get();
3701 if (smb_buffer == NULL)
3702 return -ENOMEM;
3703
3704 smb_buffer_response = smb_buffer;
3705
3706 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3707 NULL /*no tid */ , 4 /*wct */ );
3708
3709 smb_buffer->Mid = get_next_mid(ses->server);
3710 smb_buffer->Uid = ses->Suid;
3711 pSMB = (TCONX_REQ *) smb_buffer;
3712 pSMBr = (TCONX_RSP *) smb_buffer_response;
3713
3714 pSMB->AndXCommand = 0xFF;
3715 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3716 bcc_ptr = &pSMB->Password[0];
3717 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3718 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3719 *bcc_ptr = 0; /* password is null byte */
3720 bcc_ptr++; /* skip password */
3721 /* already aligned so no need to do it below */
3722 } else {
3723 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3724 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3725 specified as required (when that support is added to
3726 the vfs in the future) as only NTLM or the much
3727 weaker LANMAN (which we do not send by default) is accepted
3728 by Samba (not sure whether other servers allow
3729 NTLMv2 password here) */
3730 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3731 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3732 (ses->server->secType == LANMAN))
3733 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3734 ses->server->sec_mode &
3735 SECMODE_PW_ENCRYPT ? true : false,
3736 bcc_ptr);
3737 else
3738 #endif /* CIFS_WEAK_PW_HASH */
3739 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3740 bcc_ptr, nls_codepage);
3741
3742 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3743 if (ses->capabilities & CAP_UNICODE) {
3744 /* must align unicode strings */
3745 *bcc_ptr = 0; /* null byte password */
3746 bcc_ptr++;
3747 }
3748 }
3749
3750 if (ses->server->sec_mode &
3751 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3752 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3753
3754 if (ses->capabilities & CAP_STATUS32) {
3755 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3756 }
3757 if (ses->capabilities & CAP_DFS) {
3758 smb_buffer->Flags2 |= SMBFLG2_DFS;
3759 }
3760 if (ses->capabilities & CAP_UNICODE) {
3761 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3762 length =
3763 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3764 6 /* max utf8 char length in bytes */ *
3765 (/* server len*/ + 256 /* share len */), nls_codepage);
3766 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3767 bcc_ptr += 2; /* skip trailing null */
3768 } else { /* ASCII */
3769 strcpy(bcc_ptr, tree);
3770 bcc_ptr += strlen(tree) + 1;
3771 }
3772 strcpy(bcc_ptr, "?????");
3773 bcc_ptr += strlen("?????");
3774 bcc_ptr += 1;
3775 count = bcc_ptr - &pSMB->Password[0];
3776 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3777 pSMB->hdr.smb_buf_length) + count);
3778 pSMB->ByteCount = cpu_to_le16(count);
3779
3780 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3781 0);
3782
3783 /* above now done in SendReceive */
3784 if ((rc == 0) && (tcon != NULL)) {
3785 bool is_unicode;
3786
3787 tcon->tidStatus = CifsGood;
3788 tcon->need_reconnect = false;
3789 tcon->tid = smb_buffer_response->Tid;
3790 bcc_ptr = pByteArea(smb_buffer_response);
3791 bytes_left = get_bcc(smb_buffer_response);
3792 length = strnlen(bcc_ptr, bytes_left - 2);
3793 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3794 is_unicode = true;
3795 else
3796 is_unicode = false;
3797
3798
3799 /* skip service field (NB: this field is always ASCII) */
3800 if (length == 3) {
3801 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3802 (bcc_ptr[2] == 'C')) {
3803 cifs_dbg(FYI, "IPC connection\n");
3804 tcon->ipc = 1;
3805 }
3806 } else if (length == 2) {
3807 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3808 /* the most common case */
3809 cifs_dbg(FYI, "disk share connection\n");
3810 }
3811 }
3812 bcc_ptr += length + 1;
3813 bytes_left -= (length + 1);
3814 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3815
3816 /* mostly informational -- no need to fail on error here */
3817 kfree(tcon->nativeFileSystem);
3818 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3819 bytes_left, is_unicode,
3820 nls_codepage);
3821
3822 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3823
3824 if ((smb_buffer_response->WordCount == 3) ||
3825 (smb_buffer_response->WordCount == 7))
3826 /* field is in same location */
3827 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3828 else
3829 tcon->Flags = 0;
3830 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3831 } else if ((rc == 0) && tcon == NULL) {
3832 /* all we need to save for IPC$ connection */
3833 ses->ipc_tid = smb_buffer_response->Tid;
3834 }
3835
3836 cifs_buf_release(smb_buffer);
3837 return rc;
3838 }
3839
3840 void
3841 cifs_umount(struct cifs_sb_info *cifs_sb)
3842 {
3843 struct rb_root *root = &cifs_sb->tlink_tree;
3844 struct rb_node *node;
3845 struct tcon_link *tlink;
3846
3847 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3848
3849 spin_lock(&cifs_sb->tlink_tree_lock);
3850 while ((node = rb_first(root))) {
3851 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3852 cifs_get_tlink(tlink);
3853 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3854 rb_erase(node, root);
3855
3856 spin_unlock(&cifs_sb->tlink_tree_lock);
3857 cifs_put_tlink(tlink);
3858 spin_lock(&cifs_sb->tlink_tree_lock);
3859 }
3860 spin_unlock(&cifs_sb->tlink_tree_lock);
3861
3862 bdi_destroy(&cifs_sb->bdi);
3863 kfree(cifs_sb->mountdata);
3864 kfree(cifs_sb->prepath);
3865 unload_nls(cifs_sb->local_nls);
3866 kfree(cifs_sb);
3867 }
3868
3869 int
3870 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3871 {
3872 int rc = 0;
3873 struct TCP_Server_Info *server = ses->server;
3874
3875 if (!server->ops->need_neg || !server->ops->negotiate)
3876 return -ENOSYS;
3877
3878 /* only send once per connect */
3879 if (!server->ops->need_neg(server))
3880 return 0;
3881
3882 set_credits(server, 1);
3883
3884 rc = server->ops->negotiate(xid, ses);
3885 if (rc == 0) {
3886 spin_lock(&GlobalMid_Lock);
3887 if (server->tcpStatus == CifsNeedNegotiate)
3888 server->tcpStatus = CifsGood;
3889 else
3890 rc = -EHOSTDOWN;
3891 spin_unlock(&GlobalMid_Lock);
3892 }
3893
3894 return rc;
3895 }
3896
3897 int
3898 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3899 struct nls_table *nls_info)
3900 {
3901 int rc = -ENOSYS;
3902 struct TCP_Server_Info *server = ses->server;
3903
3904 ses->flags = 0;
3905 ses->capabilities = server->capabilities;
3906 if (linuxExtEnabled == 0)
3907 ses->capabilities &= (~server->vals->cap_unix);
3908
3909 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3910 server->sec_mode, server->capabilities, server->timeAdj);
3911
3912 if (server->ops->sess_setup)
3913 rc = server->ops->sess_setup(xid, ses, nls_info);
3914
3915 if (rc) {
3916 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3917 } else {
3918 mutex_lock(&server->srv_mutex);
3919 if (!server->session_estab) {
3920 server->session_key.response = ses->auth_key.response;
3921 server->session_key.len = ses->auth_key.len;
3922 server->sequence_number = 0x2;
3923 server->session_estab = true;
3924 ses->auth_key.response = NULL;
3925 }
3926 mutex_unlock(&server->srv_mutex);
3927
3928 cifs_dbg(FYI, "CIFS Session Established successfully\n");
3929 spin_lock(&GlobalMid_Lock);
3930 ses->status = CifsGood;
3931 ses->need_reconnect = false;
3932 spin_unlock(&GlobalMid_Lock);
3933 }
3934
3935 kfree(ses->auth_key.response);
3936 ses->auth_key.response = NULL;
3937 ses->auth_key.len = 0;
3938 kfree(ses->ntlmssp);
3939 ses->ntlmssp = NULL;
3940
3941 return rc;
3942 }
3943
3944 static int
3945 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3946 {
3947 switch (ses->server->secType) {
3948 case Kerberos:
3949 vol->secFlg = CIFSSEC_MUST_KRB5;
3950 return 0;
3951 case NTLMv2:
3952 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3953 break;
3954 case NTLM:
3955 vol->secFlg = CIFSSEC_MUST_NTLM;
3956 break;
3957 case RawNTLMSSP:
3958 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3959 break;
3960 case LANMAN:
3961 vol->secFlg = CIFSSEC_MUST_LANMAN;
3962 break;
3963 }
3964
3965 return cifs_set_cifscreds(vol, ses);
3966 }
3967
3968 static struct cifs_tcon *
3969 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3970 {
3971 int rc;
3972 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3973 struct cifs_ses *ses;
3974 struct cifs_tcon *tcon = NULL;
3975 struct smb_vol *vol_info;
3976
3977 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3978 if (vol_info == NULL)
3979 return ERR_PTR(-ENOMEM);
3980
3981 vol_info->local_nls = cifs_sb->local_nls;
3982 vol_info->linux_uid = fsuid;
3983 vol_info->cred_uid = fsuid;
3984 vol_info->UNC = master_tcon->treeName;
3985 vol_info->retry = master_tcon->retry;
3986 vol_info->nocase = master_tcon->nocase;
3987 vol_info->local_lease = master_tcon->local_lease;
3988 vol_info->no_linux_ext = !master_tcon->unix_ext;
3989
3990 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3991 if (rc) {
3992 tcon = ERR_PTR(rc);
3993 goto out;
3994 }
3995
3996 /* get a reference for the same TCP session */
3997 spin_lock(&cifs_tcp_ses_lock);
3998 ++master_tcon->ses->server->srv_count;
3999 spin_unlock(&cifs_tcp_ses_lock);
4000
4001 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4002 if (IS_ERR(ses)) {
4003 tcon = (struct cifs_tcon *)ses;
4004 cifs_put_tcp_session(master_tcon->ses->server, 0);
4005 goto out;
4006 }
4007
4008 tcon = cifs_get_tcon(ses, vol_info);
4009 if (IS_ERR(tcon)) {
4010 cifs_put_smb_ses(ses);
4011 goto out;
4012 }
4013
4014 if (cap_unix(ses))
4015 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4016 out:
4017 kfree(vol_info->username);
4018 kfree(vol_info->password);
4019 kfree(vol_info);
4020
4021 return tcon;
4022 }
4023
4024 struct cifs_tcon *
4025 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4026 {
4027 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4028 }
4029
4030 static int
4031 cifs_sb_tcon_pending_wait(void *unused)
4032 {
4033 schedule();
4034 return signal_pending(current) ? -ERESTARTSYS : 0;
4035 }
4036
4037 /* find and return a tlink with given uid */
4038 static struct tcon_link *
4039 tlink_rb_search(struct rb_root *root, kuid_t uid)
4040 {
4041 struct rb_node *node = root->rb_node;
4042 struct tcon_link *tlink;
4043
4044 while (node) {
4045 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4046
4047 if (uid_gt(tlink->tl_uid, uid))
4048 node = node->rb_left;
4049 else if (uid_lt(tlink->tl_uid, uid))
4050 node = node->rb_right;
4051 else
4052 return tlink;
4053 }
4054 return NULL;
4055 }
4056
4057 /* insert a tcon_link into the tree */
4058 static void
4059 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4060 {
4061 struct rb_node **new = &(root->rb_node), *parent = NULL;
4062 struct tcon_link *tlink;
4063
4064 while (*new) {
4065 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4066 parent = *new;
4067
4068 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4069 new = &((*new)->rb_left);
4070 else
4071 new = &((*new)->rb_right);
4072 }
4073
4074 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4075 rb_insert_color(&new_tlink->tl_rbnode, root);
4076 }
4077
4078 /*
4079 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4080 * current task.
4081 *
4082 * If the superblock doesn't refer to a multiuser mount, then just return
4083 * the master tcon for the mount.
4084 *
4085 * First, search the rbtree for an existing tcon for this fsuid. If one
4086 * exists, then check to see if it's pending construction. If it is then wait
4087 * for construction to complete. Once it's no longer pending, check to see if
4088 * it failed and either return an error or retry construction, depending on
4089 * the timeout.
4090 *
4091 * If one doesn't exist then insert a new tcon_link struct into the tree and
4092 * try to construct a new one.
4093 */
4094 struct tcon_link *
4095 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4096 {
4097 int ret;
4098 kuid_t fsuid = current_fsuid();
4099 struct tcon_link *tlink, *newtlink;
4100
4101 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4102 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4103
4104 spin_lock(&cifs_sb->tlink_tree_lock);
4105 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4106 if (tlink)
4107 cifs_get_tlink(tlink);
4108 spin_unlock(&cifs_sb->tlink_tree_lock);
4109
4110 if (tlink == NULL) {
4111 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4112 if (newtlink == NULL)
4113 return ERR_PTR(-ENOMEM);
4114 newtlink->tl_uid = fsuid;
4115 newtlink->tl_tcon = ERR_PTR(-EACCES);
4116 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4117 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4118 cifs_get_tlink(newtlink);
4119
4120 spin_lock(&cifs_sb->tlink_tree_lock);
4121 /* was one inserted after previous search? */
4122 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4123 if (tlink) {
4124 cifs_get_tlink(tlink);
4125 spin_unlock(&cifs_sb->tlink_tree_lock);
4126 kfree(newtlink);
4127 goto wait_for_construction;
4128 }
4129 tlink = newtlink;
4130 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4131 spin_unlock(&cifs_sb->tlink_tree_lock);
4132 } else {
4133 wait_for_construction:
4134 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4135 cifs_sb_tcon_pending_wait,
4136 TASK_INTERRUPTIBLE);
4137 if (ret) {
4138 cifs_put_tlink(tlink);
4139 return ERR_PTR(ret);
4140 }
4141
4142 /* if it's good, return it */
4143 if (!IS_ERR(tlink->tl_tcon))
4144 return tlink;
4145
4146 /* return error if we tried this already recently */
4147 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4148 cifs_put_tlink(tlink);
4149 return ERR_PTR(-EACCES);
4150 }
4151
4152 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4153 goto wait_for_construction;
4154 }
4155
4156 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4157 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4158 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4159
4160 if (IS_ERR(tlink->tl_tcon)) {
4161 cifs_put_tlink(tlink);
4162 return ERR_PTR(-EACCES);
4163 }
4164
4165 return tlink;
4166 }
4167
4168 /*
4169 * periodic workqueue job that scans tcon_tree for a superblock and closes
4170 * out tcons.
4171 */
4172 static void
4173 cifs_prune_tlinks(struct work_struct *work)
4174 {
4175 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4176 prune_tlinks.work);
4177 struct rb_root *root = &cifs_sb->tlink_tree;
4178 struct rb_node *node = rb_first(root);
4179 struct rb_node *tmp;
4180 struct tcon_link *tlink;
4181
4182 /*
4183 * Because we drop the spinlock in the loop in order to put the tlink
4184 * it's not guarded against removal of links from the tree. The only
4185 * places that remove entries from the tree are this function and
4186 * umounts. Because this function is non-reentrant and is canceled
4187 * before umount can proceed, this is safe.
4188 */
4189 spin_lock(&cifs_sb->tlink_tree_lock);
4190 node = rb_first(root);
4191 while (node != NULL) {
4192 tmp = node;
4193 node = rb_next(tmp);
4194 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4195
4196 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4197 atomic_read(&tlink->tl_count) != 0 ||
4198 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4199 continue;
4200
4201 cifs_get_tlink(tlink);
4202 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4203 rb_erase(tmp, root);
4204
4205 spin_unlock(&cifs_sb->tlink_tree_lock);
4206 cifs_put_tlink(tlink);
4207 spin_lock(&cifs_sb->tlink_tree_lock);
4208 }
4209 spin_unlock(&cifs_sb->tlink_tree_lock);
4210
4211 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4212 TLINK_IDLE_EXPIRE);
4213 }
kernel source for telekom puls (alcatel/mediatek)