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cifs: fix a possible null pointer deref in decode_ascii_ssetup
[deliverable/linux.git] / fs / cifs / connect.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/cifs/connect.c
3 *
1080ef75 4 * Copyright (C) International Business Machines Corp., 2002,2011
1da177e4
LT		 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
fb8c4b14 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1da177e4
LT		 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>
5a0e3ad6 26#include <linux/slab.h>
1da177e4
LT		 27#include <linux/pagemap.h>
28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/mempool.h>
b8643e1b 31#include <linux/delay.h>
f191401f 32#include <linux/completion.h>
aaf737ad 33#include <linux/kthread.h>
0ae0efad 34#include <linux/pagevec.h>
7dfb7103 35#include <linux/freezer.h>
5c2503a8 36#include <linux/namei.h>
1da177e4
LT		 37#include <asm/uaccess.h>
38#include <asm/processor.h>
50b64e3b 39#include <linux/inet.h>
143cb494 40#include <linux/module.h>
8a8798a5 41#include <keys/user-type.h>
0e2bedaa 42#include <net/ipv6.h>
8830d7e0
SP		 43#include <linux/parser.h>
44
1da177e4
LT		 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"
488f1d2d 54#include "fscache.h"
1da177e4
LT		 55
56#define CIFS_PORT 445
57#define RFC1001_PORT 139
58
1da177e4
LT		 59extern mempool_t *cifs_req_poolp;
60
2de970ff 61/* FIXME: should these be tunable? */
9d002df4 62#define TLINK_ERROR_EXPIRE (1 * HZ)
2de970ff 63#define TLINK_IDLE_EXPIRE (600 * HZ)
9d002df4 64
8830d7e0
SP		 65enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
72bd481f 70 Opt_forcegid, Opt_noforcegid,
8830d7e0
SP		 71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapchars, Opt_nomapchars, Opt_sfu,
74 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
75 Opt_noposixpaths, Opt_nounix,
76 Opt_nocase,
77 Opt_brl, Opt_nobrl,
78 Opt_forcemandatorylock, Opt_setuids,
79 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
80 Opt_nohard, Opt_nosoft,
81 Opt_nointr, Opt_intr,
82 Opt_nostrictsync, Opt_strictsync,
83 Opt_serverino, Opt_noserverino,
84 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
85 Opt_acl, Opt_noacl, Opt_locallease,
1b359204 86 Opt_sign, Opt_seal, Opt_noac,
8830d7e0 87 Opt_fsc, Opt_mfsymlinks,
a0b3df5c 88 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
8830d7e0
SP		 89
90 /* Mount options which take numeric value */
91 Opt_backupuid, Opt_backupgid, Opt_uid,
92 Opt_cruid, Opt_gid, Opt_file_mode,
93 Opt_dirmode, Opt_port,
94 Opt_rsize, Opt_wsize, Opt_actimeo,
95
96 /* Mount options which take string value */
97 Opt_user, Opt_pass, Opt_ip,
73a999fa 98 Opt_domain, Opt_srcaddr, Opt_iocharset,
8830d7e0 99 Opt_netbiosname, Opt_servern,
23db65f5 100 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
8830d7e0
SP		 101
102 /* Mount options to be ignored */
103 Opt_ignore,
104
105 /* Options which could be blank */
106 Opt_blank_pass,
4fe9e963
SP		 107 Opt_blank_user,
108 Opt_blank_ip,
8830d7e0
SP		 109
110 Opt_err
111};
112
113static const match_table_t cifs_mount_option_tokens = {
114
115 { Opt_user_xattr, "user_xattr" },
116 { Opt_nouser_xattr, "nouser_xattr" },
117 { Opt_forceuid, "forceuid" },
118 { Opt_noforceuid, "noforceuid" },
72bd481f
JL		 119 { Opt_forcegid, "forcegid" },
120 { Opt_noforcegid, "noforcegid" },
8830d7e0
SP		 121 { Opt_noblocksend, "noblocksend" },
122 { Opt_noautotune, "noautotune" },
123 { Opt_hard, "hard" },
124 { Opt_soft, "soft" },
125 { Opt_perm, "perm" },
126 { Opt_noperm, "noperm" },
127 { Opt_mapchars, "mapchars" },
128 { Opt_nomapchars, "nomapchars" },
129 { Opt_sfu, "sfu" },
130 { Opt_nosfu, "nosfu" },
131 { Opt_nodfs, "nodfs" },
132 { Opt_posixpaths, "posixpaths" },
133 { Opt_noposixpaths, "noposixpaths" },
134 { Opt_nounix, "nounix" },
135 { Opt_nounix, "nolinux" },
136 { Opt_nocase, "nocase" },
137 { Opt_nocase, "ignorecase" },
138 { Opt_brl, "brl" },
139 { Opt_nobrl, "nobrl" },
140 { Opt_nobrl, "nolock" },
141 { Opt_forcemandatorylock, "forcemandatorylock" },
5cfdddcf 142 { Opt_forcemandatorylock, "forcemand" },
8830d7e0
SP		 143 { Opt_setuids, "setuids" },
144 { Opt_nosetuids, "nosetuids" },
145 { Opt_dynperm, "dynperm" },
146 { Opt_nodynperm, "nodynperm" },
147 { Opt_nohard, "nohard" },
148 { Opt_nosoft, "nosoft" },
149 { Opt_nointr, "nointr" },
150 { Opt_intr, "intr" },
151 { Opt_nostrictsync, "nostrictsync" },
152 { Opt_strictsync, "strictsync" },
153 { Opt_serverino, "serverino" },
154 { Opt_noserverino, "noserverino" },
155 { Opt_rwpidforward, "rwpidforward" },
156 { Opt_cifsacl, "cifsacl" },
157 { Opt_nocifsacl, "nocifsacl" },
158 { Opt_acl, "acl" },
159 { Opt_noacl, "noacl" },
160 { Opt_locallease, "locallease" },
161 { Opt_sign, "sign" },
162 { Opt_seal, "seal" },
8830d7e0
SP		 163 { Opt_noac, "noac" },
164 { Opt_fsc, "fsc" },
165 { Opt_mfsymlinks, "mfsymlinks" },
166 { Opt_multiuser, "multiuser" },
d8162558 167 { Opt_sloppy, "sloppy" },
a0b3df5c 168 { Opt_nosharesock, "nosharesock" },
8830d7e0
SP		 169
170 { Opt_backupuid, "backupuid=%s" },
171 { Opt_backupgid, "backupgid=%s" },
172 { Opt_uid, "uid=%s" },
173 { Opt_cruid, "cruid=%s" },
174 { Opt_gid, "gid=%s" },
175 { Opt_file_mode, "file_mode=%s" },
176 { Opt_dirmode, "dirmode=%s" },
177 { Opt_dirmode, "dir_mode=%s" },
178 { Opt_port, "port=%s" },
179 { Opt_rsize, "rsize=%s" },
180 { Opt_wsize, "wsize=%s" },
181 { Opt_actimeo, "actimeo=%s" },
182
4fe9e963
SP		 183 { Opt_blank_user, "user=" },
184 { Opt_blank_user, "username=" },
8830d7e0
SP		 185 { Opt_user, "user=%s" },
186 { Opt_user, "username=%s" },
187 { Opt_blank_pass, "pass=" },
3c15b4cf 188 { Opt_blank_pass, "password=" },
8830d7e0
SP		 189 { Opt_pass, "pass=%s" },
190 { Opt_pass, "password=%s" },
4fe9e963
SP		 191 { Opt_blank_ip, "ip=" },
192 { Opt_blank_ip, "addr=" },
8830d7e0
SP		 193 { Opt_ip, "ip=%s" },
194 { Opt_ip, "addr=%s" },
73a999fa
JL		 195 { Opt_ignore, "unc=%s" },
196 { Opt_ignore, "target=%s" },
197 { Opt_ignore, "path=%s" },
8830d7e0
SP		 198 { Opt_domain, "dom=%s" },
199 { Opt_domain, "domain=%s" },
200 { Opt_domain, "workgroup=%s" },
201 { Opt_srcaddr, "srcaddr=%s" },
73a999fa 202 { Opt_ignore, "prefixpath=%s" },
8830d7e0 203 { Opt_iocharset, "iocharset=%s" },
8830d7e0
SP		 204 { Opt_netbiosname, "netbiosname=%s" },
205 { Opt_servern, "servern=%s" },
206 { Opt_ver, "ver=%s" },
23db65f5 207 { Opt_vers, "vers=%s" },
8830d7e0 208 { Opt_sec, "sec=%s" },
15b6a473 209 { Opt_cache, "cache=%s" },
8830d7e0
SP		 210
211 { Opt_ignore, "cred" },
212 { Opt_ignore, "credentials" },
a557b976
JL		 213 { Opt_ignore, "cred=%s" },
214 { Opt_ignore, "credentials=%s" },
8830d7e0
SP		 215 { Opt_ignore, "guest" },
216 { Opt_ignore, "rw" },
217 { Opt_ignore, "ro" },
218 { Opt_ignore, "suid" },
219 { Opt_ignore, "nosuid" },
220 { Opt_ignore, "exec" },
221 { Opt_ignore, "noexec" },
222 { Opt_ignore, "nodev" },
223 { Opt_ignore, "noauto" },
224 { Opt_ignore, "dev" },
225 { Opt_ignore, "mand" },
226 { Opt_ignore, "nomand" },
227 { Opt_ignore, "_netdev" },
228
229 { Opt_err, NULL }
230};
231
232enum {
233 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
234 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
7659624f
JL		 235 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
236 Opt_sec_ntlmv2i, Opt_sec_lanman,
8830d7e0
SP		 237 Opt_sec_none,
238
239 Opt_sec_err
240};
241
242static const match_table_t cifs_secflavor_tokens = {
243 { Opt_sec_krb5, "krb5" },
244 { Opt_sec_krb5i, "krb5i" },
245 { Opt_sec_krb5p, "krb5p" },
246 { Opt_sec_ntlmsspi, "ntlmsspi" },
247 { Opt_sec_ntlmssp, "ntlmssp" },
248 { Opt_ntlm, "ntlm" },
249 { Opt_sec_ntlmi, "ntlmi" },
7659624f
JL		 250 { Opt_sec_ntlmv2, "nontlm" },
251 { Opt_sec_ntlmv2, "ntlmv2" },
8830d7e0 252 { Opt_sec_ntlmv2i, "ntlmv2i" },
8830d7e0
SP		 253 { Opt_sec_lanman, "lanman" },
254 { Opt_sec_none, "none" },
255
256 { Opt_sec_err, NULL }
257};
258
15b6a473
JL		 259/* cache flavors */
260enum {
261 Opt_cache_loose,
262 Opt_cache_strict,
263 Opt_cache_none,
264 Opt_cache_err
265};
266
267static const match_table_t cifs_cacheflavor_tokens = {
268 { Opt_cache_loose, "loose" },
269 { Opt_cache_strict, "strict" },
270 { Opt_cache_none, "none" },
271 { Opt_cache_err, NULL }
272};
273
23db65f5
JL		 274static const match_table_t cifs_smb_version_tokens = {
275 { Smb_1, SMB1_VERSION_STRING },
dd446b16 276 { Smb_20, SMB20_VERSION_STRING},
1080ef75 277 { Smb_21, SMB21_VERSION_STRING },
e4aa25e7 278 { Smb_30, SMB30_VERSION_STRING },
20b6d8b4 279 { Smb_302, SMB302_VERSION_STRING },
23db65f5
JL		 280};
281
a9f1b85e
PS		 282static int ip_connect(struct TCP_Server_Info *server);
283static int generic_ip_connect(struct TCP_Server_Info *server);
b647c35f 284static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
2de970ff 285static void cifs_prune_tlinks(struct work_struct *work);
b9bce2e9
JL		 286static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
287 const char *devname);
1da177e4 288
d5c5605c
JL		 289/*
290 * cifs tcp session reconnection
291 *
292 * mark tcp session as reconnecting so temporarily locked
293 * mark all smb sessions as reconnecting for tcp session
294 * reconnect tcp session
295 * wake up waiters on reconnection? - (not needed currently)
296 */
28ea5290 297int
1da177e4
LT		 298cifs_reconnect(struct TCP_Server_Info *server)
299{
300 int rc = 0;
f1987b44 301 struct list_head *tmp, *tmp2;
96daf2b0
SF		 302 struct cifs_ses *ses;
303 struct cifs_tcon *tcon;
fb8c4b14 304 struct mid_q_entry *mid_entry;
3c1105df 305 struct list_head retry_list;
50c2f753 306
1da177e4 307 spin_lock(&GlobalMid_Lock);
469ee614 308 if (server->tcpStatus == CifsExiting) {
fb8c4b14 309 /* the demux thread will exit normally
1da177e4
LT		 310 next time through the loop */
311 spin_unlock(&GlobalMid_Lock);
312 return rc;
313 } else
314 server->tcpStatus = CifsNeedReconnect;
315 spin_unlock(&GlobalMid_Lock);
316 server->maxBuf = 0;
aa24d1e9
PS		 317#ifdef CONFIG_CIFS_SMB2
318 server->max_read = 0;
319#endif
1da177e4 320
f96637be 321 cifs_dbg(FYI, "Reconnecting tcp session\n");
1da177e4
LT		 322
323 /* before reconnecting the tcp session, mark the smb session (uid)
324 and the tid bad so they are not used until reconnected */
f96637be
JP		 325 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
326 __func__);
3f9bcca7 327 spin_lock(&cifs_tcp_ses_lock);
14fbf50d 328 list_for_each(tmp, &server->smb_ses_list) {
96daf2b0 329 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
14fbf50d
JL		 330 ses->need_reconnect = true;
331 ses->ipc_tid = 0;
f1987b44 332 list_for_each(tmp2, &ses->tcon_list) {
96daf2b0 333 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
3b795210 334 tcon->need_reconnect = true;
1da177e4 335 }
1da177e4 336 }
3f9bcca7 337 spin_unlock(&cifs_tcp_ses_lock);
2b84a36c 338
1da177e4 339 /* do not want to be sending data on a socket we are freeing */
f96637be 340 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
72ca545b 341 mutex_lock(&server->srv_mutex);
fb8c4b14 342 if (server->ssocket) {
f96637be
JP		 343 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
344 server->ssocket->state, server->ssocket->flags);
91cf45f0 345 kernel_sock_shutdown(server->ssocket, SHUT_WR);
f96637be
JP		 346 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
347 server->ssocket->state, server->ssocket->flags);
1da177e4
LT		 348 sock_release(server->ssocket);
349 server->ssocket = NULL;
350 }
5d0d2882
SP		 351 server->sequence_number = 0;
352 server->session_estab = false;
21e73393
SP		 353 kfree(server->session_key.response);
354 server->session_key.response = NULL;
355 server->session_key.len = 0;
fda35943 356 server->lstrp = jiffies;
2b84a36c 357 mutex_unlock(&server->srv_mutex);
1da177e4 358
2b84a36c 359 /* mark submitted MIDs for retry and issue callback */
3c1105df 360 INIT_LIST_HEAD(&retry_list);
f96637be 361 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
1da177e4 362 spin_lock(&GlobalMid_Lock);
2b84a36c
JL		 363 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
364 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
7c9421e1
PS		 365 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
366 mid_entry->mid_state = MID_RETRY_NEEDED;
3c1105df
JL		 367 list_move(&mid_entry->qhead, &retry_list);
368 }
369 spin_unlock(&GlobalMid_Lock);
370
f96637be 371 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
3c1105df
JL		 372 list_for_each_safe(tmp, tmp2, &retry_list) {
373 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
2b84a36c
JL		 374 list_del_init(&mid_entry->qhead);
375 mid_entry->callback(mid_entry);
1da177e4 376 }
1da177e4 377
7fdbaa1b 378 do {
6c3d8909 379 try_to_freeze();
a9f1b85e
PS		 380
381 /* we should try only the port we connected to before */
73e216a8 382 mutex_lock(&server->srv_mutex);
a9f1b85e 383 rc = generic_ip_connect(server);
fb8c4b14 384 if (rc) {
f96637be 385 cifs_dbg(FYI, "reconnect error %d\n", rc);
0cb766ae 386 msleep(3000);
1da177e4
LT		 387 } else {
388 atomic_inc(&tcpSesReconnectCount);
389 spin_lock(&GlobalMid_Lock);
469ee614 390 if (server->tcpStatus != CifsExiting)
fd88ce93 391 server->tcpStatus = CifsNeedNegotiate;
fb8c4b14 392 spin_unlock(&GlobalMid_Lock);
1da177e4 393 }
73e216a8 394 mutex_unlock(&server->srv_mutex);
7fdbaa1b 395 } while (server->tcpStatus == CifsNeedReconnect);
2b84a36c 396
1da177e4
LT		 397 return rc;
398}
399
c74093b6
JL		 400static void
401cifs_echo_request(struct work_struct *work)
402{
403 int rc;
404 struct TCP_Server_Info *server = container_of(work,
405 struct TCP_Server_Info, echo.work);
406
247ec9b4 407 /*
f6d76178
PS		 408 * We cannot send an echo if it is disabled or until the
409 * NEGOTIATE_PROTOCOL request is done, which is indicated by
410 * server->ops->need_neg() == true. Also, no need to ping if
411 * we got a response recently.
247ec9b4 412 */
286170aa 413 if (!server->ops->need_neg || server->ops->need_neg(server) ||
f6d76178 414 (server->ops->can_echo && !server->ops->can_echo(server)) ||
247ec9b4 415 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
c74093b6
JL		 416 goto requeue_echo;
417
f6d76178 418 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
c74093b6 419 if (rc)
f96637be
JP		 420 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
421 server->hostname);
c74093b6
JL		 422
423requeue_echo:
da472fc8 424 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
c74093b6
JL		 425}
426
3d9c2472 427static bool
2a37ef94 428allocate_buffers(struct TCP_Server_Info *server)
3d9c2472 429{
2a37ef94
JL		 430 if (!server->bigbuf) {
431 server->bigbuf = (char *)cifs_buf_get();
432 if (!server->bigbuf) {
f96637be 433 cifs_dbg(VFS, "No memory for large SMB response\n");
3d9c2472
PS		 434 msleep(3000);
435 /* retry will check if exiting */
436 return false;
437 }
2a37ef94 438 } else if (server->large_buf) {
3d9c2472 439 /* we are reusing a dirty large buf, clear its start */
1887f601 440 memset(server->bigbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 441 }
442
2a37ef94
JL		 443 if (!server->smallbuf) {
444 server->smallbuf = (char *)cifs_small_buf_get();
445 if (!server->smallbuf) {
f96637be 446 cifs_dbg(VFS, "No memory for SMB response\n");
3d9c2472
PS		 447 msleep(1000);
448 /* retry will check if exiting */
449 return false;
450 }
451 /* beginning of smb buffer is cleared in our buf_get */
452 } else {
453 /* if existing small buf clear beginning */
1887f601 454 memset(server->smallbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 455 }
456
3d9c2472
PS		 457 return true;
458}
459
ba749e6d
JL		 460static bool
461server_unresponsive(struct TCP_Server_Info *server)
462{
6dae51a5
PS		 463 /*
464 * We need to wait 2 echo intervals to make sure we handle such
465 * situations right:
466 * 1s client sends a normal SMB request
467 * 2s client gets a response
468 * 30s echo workqueue job pops, and decides we got a response recently
469 * and don't need to send another
470 * ...
471 * 65s kernel_recvmsg times out, and we see that we haven't gotten
472 * a response in >60s.
473 */
474 if (server->tcpStatus == CifsGood &&
475 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
f96637be
JP		 476 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
477 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
ba749e6d
JL		 478 cifs_reconnect(server);
479 wake_up(&server->response_q);
480 return true;
481 }
482
483 return false;
484}
485
42c4dfc2
JL		 486/*
487 * kvec_array_init - clone a kvec array, and advance into it
488 * @new: pointer to memory for cloned array
489 * @iov: pointer to original array
490 * @nr_segs: number of members in original array
491 * @bytes: number of bytes to advance into the cloned array
492 *
493 * This function will copy the array provided in iov to a section of memory
494 * and advance the specified number of bytes into the new array. It returns
495 * the number of segments in the new array. "new" must be at least as big as
496 * the original iov array.
497 */
498static unsigned int
499kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
500 size_t bytes)
501{
502 size_t base = 0;
503
504 while (bytes || !iov->iov_len) {
505 int copy = min(bytes, iov->iov_len);
506
507 bytes -= copy;
508 base += copy;
509 if (iov->iov_len == base) {
510 iov++;
511 nr_segs--;
512 base = 0;
513 }
514 }
515 memcpy(new, iov, sizeof(*iov) * nr_segs);
516 new->iov_base += base;
517 new->iov_len -= base;
518 return nr_segs;
519}
520
1041e3f9
JL		 521static struct kvec *
522get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
e7015fb1 523{
1041e3f9
JL		 524 struct kvec *new_iov;
525
526 if (server->iov && nr_segs <= server->nr_iov)
527 return server->iov;
528
529 /* not big enough -- allocate a new one and release the old */
530 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
531 if (new_iov) {
532 kfree(server->iov);
533 server->iov = new_iov;
534 server->nr_iov = nr_segs;
535 }
536 return new_iov;
537}
538
e28bc5b1
JL		 539int
540cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
541 unsigned int nr_segs, unsigned int to_read)
e7015fb1 542{
a52c1eb7
JL		 543 int length = 0;
544 int total_read;
42c4dfc2 545 unsigned int segs;
e831e6cf 546 struct msghdr smb_msg;
42c4dfc2
JL		 547 struct kvec *iov;
548
1041e3f9 549 iov = get_server_iovec(server, nr_segs);
42c4dfc2
JL		 550 if (!iov)
551 return -ENOMEM;
e7015fb1 552
e831e6cf
JL		 553 smb_msg.msg_control = NULL;
554 smb_msg.msg_controllen = 0;
555
a52c1eb7 556 for (total_read = 0; to_read; total_read += length, to_read -= length) {
95edcff4
JL		 557 try_to_freeze();
558
ba749e6d 559 if (server_unresponsive(server)) {
3fabaa27 560 total_read = -ECONNABORTED;
ba749e6d
JL		 561 break;
562 }
563
42c4dfc2
JL		 564 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
565
566 length = kernel_recvmsg(server->ssocket, &smb_msg,
567 iov, segs, to_read, 0);
e7015fb1 568
e7015fb1 569 if (server->tcpStatus == CifsExiting) {
a52c1eb7 570 total_read = -ESHUTDOWN;
e7015fb1
PS		 571 break;
572 } else if (server->tcpStatus == CifsNeedReconnect) {
573 cifs_reconnect(server);
3fabaa27 574 total_read = -ECONNABORTED;
e7015fb1
PS		 575 break;
576 } else if (length == -ERESTARTSYS ||
577 length == -EAGAIN ||
578 length == -EINTR) {
579 /*
580 * Minimum sleep to prevent looping, allowing socket
581 * to clear and app threads to set tcpStatus
582 * CifsNeedReconnect if server hung.
583 */
584 usleep_range(1000, 2000);
585 length = 0;
a52c1eb7 586 continue;
e7015fb1 587 } else if (length <= 0) {
f96637be
JP		 588 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
589 "got %d", to_read, length);
e7015fb1 590 cifs_reconnect(server);
3fabaa27 591 total_read = -ECONNABORTED;
e7015fb1
PS		 592 break;
593 }
594 }
a52c1eb7 595 return total_read;
e7015fb1 596}
e7015fb1 597
e28bc5b1
JL		 598int
599cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
600 unsigned int to_read)
42c4dfc2
JL		 601{
602 struct kvec iov;
603
604 iov.iov_base = buf;
605 iov.iov_len = to_read;
606
e28bc5b1 607 return cifs_readv_from_socket(server, &iov, 1, to_read);
e7015fb1
PS		 608}
609
98bac62c 610static bool
fe11e4cc 611is_smb_response(struct TCP_Server_Info *server, unsigned char type)
98bac62c 612{
98bac62c
PS		 613 /*
614 * The first byte big endian of the length field,
615 * is actually not part of the length but the type
616 * with the most common, zero, as regular data.
617 */
fe11e4cc
JL		 618 switch (type) {
619 case RFC1002_SESSION_MESSAGE:
620 /* Regular SMB response */
621 return true;
622 case RFC1002_SESSION_KEEP_ALIVE:
f96637be 623 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
fe11e4cc
JL		 624 break;
625 case RFC1002_POSITIVE_SESSION_RESPONSE:
f96637be 626 cifs_dbg(FYI, "RFC 1002 positive session response\n");
fe11e4cc
JL		 627 break;
628 case RFC1002_NEGATIVE_SESSION_RESPONSE:
98bac62c
PS		 629 /*
630 * We get this from Windows 98 instead of an error on
631 * SMB negprot response.
632 */
f96637be 633 cifs_dbg(FYI, "RFC 1002 negative session response\n");
98bac62c
PS		 634 /* give server a second to clean up */
635 msleep(1000);
636 /*
637 * Always try 445 first on reconnect since we get NACK
638 * on some if we ever connected to port 139 (the NACK
639 * is since we do not begin with RFC1001 session
640 * initialize frame).
641 */
fe11e4cc 642 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
98bac62c
PS		 643 cifs_reconnect(server);
644 wake_up(&server->response_q);
fe11e4cc
JL		 645 break;
646 default:
f96637be 647 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
98bac62c 648 cifs_reconnect(server);
98bac62c
PS		 649 }
650
fe11e4cc 651 return false;
98bac62c
PS		 652}
653
e28bc5b1
JL		 654void
655dequeue_mid(struct mid_q_entry *mid, bool malformed)
ea1f4502 656{
ad69bae1 657#ifdef CONFIG_CIFS_STATS2
ea1f4502 658 mid->when_received = jiffies;
ad69bae1 659#endif
ea1f4502
JL		 660 spin_lock(&GlobalMid_Lock);
661 if (!malformed)
7c9421e1 662 mid->mid_state = MID_RESPONSE_RECEIVED;
ea1f4502 663 else
7c9421e1 664 mid->mid_state = MID_RESPONSE_MALFORMED;
ea1f4502 665 list_del_init(&mid->qhead);
ad69bae1 666 spin_unlock(&GlobalMid_Lock);
ea1f4502 667}
ad69bae1 668
c8054ebd
JL		 669static void
670handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
d4e4854f 671 char *buf, int malformed)
ea1f4502 672{
316cf94a
PS		 673 if (server->ops->check_trans2 &&
674 server->ops->check_trans2(mid, server, buf, malformed))
c8054ebd 675 return;
ea1f4502 676 mid->resp_buf = buf;
7c9421e1 677 mid->large_buf = server->large_buf;
2a37ef94
JL		 678 /* Was previous buf put in mpx struct for multi-rsp? */
679 if (!mid->multiRsp) {
680 /* smb buffer will be freed by user thread */
681 if (server->large_buf)
682 server->bigbuf = NULL;
683 else
684 server->smallbuf = NULL;
685 }
ffc00e27 686 dequeue_mid(mid, malformed);
ad69bae1
PS		 687}
688
762dfd10
PS		 689static void clean_demultiplex_info(struct TCP_Server_Info *server)
690{
691 int length;
692
693 /* take it off the list, if it's not already */
694 spin_lock(&cifs_tcp_ses_lock);
695 list_del_init(&server->tcp_ses_list);
696 spin_unlock(&cifs_tcp_ses_lock);
697
698 spin_lock(&GlobalMid_Lock);
699 server->tcpStatus = CifsExiting;
700 spin_unlock(&GlobalMid_Lock);
701 wake_up_all(&server->response_q);
702
2d86dbc9 703 /* check if we have blocked requests that need to free */
fc40f9cf 704 spin_lock(&server->req_lock);
2d86dbc9
PS		 705 if (server->credits <= 0)
706 server->credits = 1;
fc40f9cf 707 spin_unlock(&server->req_lock);
762dfd10
PS		 708 /*
709 * Although there should not be any requests blocked on this queue it
710 * can not hurt to be paranoid and try to wake up requests that may
711 * haven been blocked when more than 50 at time were on the wire to the
712 * same server - they now will see the session is in exit state and get
713 * out of SendReceive.
714 */
715 wake_up_all(&server->request_q);
716 /* give those requests time to exit */
717 msleep(125);
718
719 if (server->ssocket) {
720 sock_release(server->ssocket);
721 server->ssocket = NULL;
722 }
723
724 if (!list_empty(&server->pending_mid_q)) {
725 struct list_head dispose_list;
726 struct mid_q_entry *mid_entry;
727 struct list_head *tmp, *tmp2;
728
729 INIT_LIST_HEAD(&dispose_list);
730 spin_lock(&GlobalMid_Lock);
731 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
732 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 733 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
7c9421e1 734 mid_entry->mid_state = MID_SHUTDOWN;
762dfd10
PS		 735 list_move(&mid_entry->qhead, &dispose_list);
736 }
737 spin_unlock(&GlobalMid_Lock);
738
739 /* now walk dispose list and issue callbacks */
740 list_for_each_safe(tmp, tmp2, &dispose_list) {
741 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 742 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
762dfd10
PS		 743 list_del_init(&mid_entry->qhead);
744 mid_entry->callback(mid_entry);
745 }
746 /* 1/8th of sec is more than enough time for them to exit */
747 msleep(125);
748 }
749
750 if (!list_empty(&server->pending_mid_q)) {
751 /*
752 * mpx threads have not exited yet give them at least the smb
753 * send timeout time for long ops.
754 *
755 * Due to delays on oplock break requests, we need to wait at
756 * least 45 seconds before giving up on a request getting a
757 * response and going ahead and killing cifsd.
758 */
f96637be 759 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
762dfd10
PS		 760 msleep(46000);
761 /*
762 * If threads still have not exited they are probably never
763 * coming home not much else we can do but free the memory.
764 */
765 }
766
767 kfree(server->hostname);
1041e3f9 768 kfree(server->iov);
762dfd10
PS		 769 kfree(server);
770
771 length = atomic_dec_return(&tcpSesAllocCount);
772 if (length > 0)
773 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
774 GFP_KERNEL);
775}
776
e9097ab4
JL		 777static int
778standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
779{
780 int length;
781 char *buf = server->smallbuf;
d4e4854f 782 unsigned int pdu_length = get_rfc1002_length(buf);
e9097ab4
JL		 783
784 /* make sure this will fit in a large buffer */
1887f601 785 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
f96637be 786 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
e9097ab4
JL		 787 cifs_reconnect(server);
788 wake_up(&server->response_q);
3fabaa27 789 return -ECONNABORTED;
e9097ab4
JL		 790 }
791
792 /* switch to large buffer if too big for a small one */
793 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
794 server->large_buf = true;
d4e4854f 795 memcpy(server->bigbuf, buf, server->total_read);
e9097ab4 796 buf = server->bigbuf;
e9097ab4
JL		 797 }
798
799 /* now read the rest */
1887f601
PS		 800 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
801 pdu_length - HEADER_SIZE(server) + 1 + 4);
e9097ab4
JL		 802 if (length < 0)
803 return length;
804 server->total_read += length;
805
d4e4854f 806 dump_smb(buf, server->total_read);
e9097ab4
JL		 807
808 /*
809 * We know that we received enough to get to the MID as we
810 * checked the pdu_length earlier. Now check to see
811 * if the rest of the header is OK. We borrow the length
812 * var for the rest of the loop to avoid a new stack var.
813 *
814 * 48 bytes is enough to display the header and a little bit
815 * into the payload for debugging purposes.
816 */
8aa26f3e 817 length = server->ops->check_message(buf, server->total_read);
e9097ab4
JL		 818 if (length != 0)
819 cifs_dump_mem("Bad SMB: ", buf,
820 min_t(unsigned int, server->total_read, 48));
821
2e44b288
PS		 822 if (server->ops->is_status_pending &&
823 server->ops->is_status_pending(buf, server, length))
824 return -1;
825
ff4fa4a2
JL		 826 if (!mid)
827 return length;
e9097ab4 828
d4e4854f 829 handle_mid(mid, server, buf, length);
ff4fa4a2 830 return 0;
e9097ab4
JL		 831}
832
1da177e4 833static int
7c97c200 834cifs_demultiplex_thread(void *p)
1da177e4
LT		 835{
836 int length;
7c97c200 837 struct TCP_Server_Info *server = p;
2a37ef94
JL		 838 unsigned int pdu_length;
839 char *buf = NULL;
1da177e4
LT		 840 struct task_struct *task_to_wake = NULL;
841 struct mid_q_entry *mid_entry;
1da177e4 842
1da177e4 843 current->flags |= PF_MEMALLOC;
f96637be 844 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
93d0ec85
JL		 845
846 length = atomic_inc_return(&tcpSesAllocCount);
847 if (length > 1)
26f57364
SF		 848 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
849 GFP_KERNEL);
1da177e4 850
83144186 851 set_freezable();
469ee614 852 while (server->tcpStatus != CifsExiting) {
ede1327e
SF		 853 if (try_to_freeze())
854 continue;
b8643e1b 855
2a37ef94 856 if (!allocate_buffers(server))
3d9c2472 857 continue;
b8643e1b 858
2a37ef94 859 server->large_buf = false;
2a37ef94 860 buf = server->smallbuf;
f01d5e14 861 pdu_length = 4; /* enough to get RFC1001 header */
fda35943 862
e28bc5b1 863 length = cifs_read_from_socket(server, buf, pdu_length);
a52c1eb7 864 if (length < 0)
1da177e4 865 continue;
2a37ef94 866 server->total_read = length;
1da177e4 867
98bac62c
PS		 868 /*
869 * The right amount was read from socket - 4 bytes,
870 * so we can now interpret the length field.
871 */
d4e4854f 872 pdu_length = get_rfc1002_length(buf);
70ca734a 873
f96637be 874 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
fe11e4cc 875 if (!is_smb_response(server, buf[0]))
fb8c4b14 876 continue;
e4eb295d 877
89482a56 878 /* make sure we have enough to get to the MID */
1887f601 879 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
f96637be
JP		 880 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
881 pdu_length);
89482a56
JL		 882 cifs_reconnect(server);
883 wake_up(&server->response_q);
884 continue;
e4eb295d 885 }
e7015fb1 886
89482a56 887 /* read down to the MID */
e28bc5b1 888 length = cifs_read_from_socket(server, buf + 4,
1887f601 889 HEADER_SIZE(server) - 1 - 4);
89482a56 890 if (length < 0)
e4eb295d 891 continue;
2a37ef94 892 server->total_read += length;
1da177e4 893
8aa26f3e 894 mid_entry = server->ops->find_mid(server, buf);
50c2f753 895
44d22d84
JL		 896 if (!mid_entry || !mid_entry->receive)
897 length = standard_receive3(server, mid_entry);
898 else
899 length = mid_entry->receive(server, mid_entry);
71823baf 900
e9097ab4 901 if (length < 0)
fe11e4cc 902 continue;
1da177e4 903
d4e4854f 904 if (server->large_buf)
2a37ef94 905 buf = server->bigbuf;
fda35943 906
fda35943 907 server->lstrp = jiffies;
2b84a36c 908 if (mid_entry != NULL) {
2a37ef94
JL		 909 if (!mid_entry->multiRsp || mid_entry->multiEnd)
910 mid_entry->callback(mid_entry);
7f0adb53
PS		 911 } else if (!server->ops->is_oplock_break ||
912 !server->ops->is_oplock_break(buf, server)) {
f96637be
JP		 913 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
914 atomic_read(&midCount));
1887f601
PS		 915 cifs_dump_mem("Received Data is: ", buf,
916 HEADER_SIZE(server));
3979877e 917#ifdef CONFIG_CIFS_DEBUG2
7f0adb53
PS		 918 if (server->ops->dump_detail)
919 server->ops->dump_detail(buf);
3979877e
SF		 920 cifs_dump_mids(server);
921#endif /* CIFS_DEBUG2 */
50c2f753 922
e4eb295d
SF		 923 }
924 } /* end while !EXITING */
925
fd62cb7e 926 /* buffer usually freed in free_mid - need to free it here on exit */
2a37ef94
JL		 927 cifs_buf_release(server->bigbuf);
928 if (server->smallbuf) /* no sense logging a debug message if NULL */
929 cifs_small_buf_release(server->smallbuf);
1da177e4 930
b1c8d2b4 931 task_to_wake = xchg(&server->tsk, NULL);
762dfd10 932 clean_demultiplex_info(server);
50c2f753 933
b1c8d2b4
JL		 934 /* if server->tsk was NULL then wait for a signal before exiting */
935 if (!task_to_wake) {
936 set_current_state(TASK_INTERRUPTIBLE);
937 while (!signal_pending(current)) {
938 schedule();
939 set_current_state(TASK_INTERRUPTIBLE);
940 }
941 set_current_state(TASK_RUNNING);
942 }
943
0468a2cf 944 module_put_and_exit(0);
1da177e4
LT		 945}
946
c359cf3c
JL		 947/* extract the host portion of the UNC string */
948static char *
949extract_hostname(const char *unc)
950{
951 const char *src;
952 char *dst, *delim;
953 unsigned int len;
954
955 /* skip double chars at beginning of string */
956 /* BB: check validity of these bytes? */
957 src = unc + 2;
958
959 /* delimiter between hostname and sharename is always '\\' now */
960 delim = strchr(src, '\\');
961 if (!delim)
962 return ERR_PTR(-EINVAL);
963
964 len = delim - src;
965 dst = kmalloc((len + 1), GFP_KERNEL);
966 if (dst == NULL)
967 return ERR_PTR(-ENOMEM);
968
969 memcpy(dst, src, len);
970 dst[len] = '\0';
971
972 return dst;
973}
974
8830d7e0
SP		 975static int get_option_ul(substring_t args[], unsigned long *option)
976{
977 int rc;
978 char *string;
979
980 string = match_strdup(args);
981 if (string == NULL)
982 return -ENOMEM;
bfa890a3 983 rc = kstrtoul(string, 0, option);
8830d7e0
SP		 984 kfree(string);
985
986 return rc;
987}
988
3da46565
EB		 989static int get_option_uid(substring_t args[], kuid_t *result)
990{
991 unsigned long value;
992 kuid_t uid;
993 int rc;
994
995 rc = get_option_ul(args, &value);
996 if (rc)
997 return rc;
998
999 uid = make_kuid(current_user_ns(), value);
1000 if (!uid_valid(uid))
1001 return -EINVAL;
1002
1003 *result = uid;
1004 return 0;
1005}
1006
1007static int get_option_gid(substring_t args[], kgid_t *result)
1008{
1009 unsigned long value;
1010 kgid_t gid;
1011 int rc;
1012
1013 rc = get_option_ul(args, &value);
1014 if (rc)
1015 return rc;
1016
1017 gid = make_kgid(current_user_ns(), value);
1018 if (!gid_valid(gid))
1019 return -EINVAL;
1020
1021 *result = gid;
1022 return 0;
1023}
8830d7e0
SP		 1024
1025static int cifs_parse_security_flavors(char *value,
1026 struct smb_vol *vol)
1027{
1028
1029 substring_t args[MAX_OPT_ARGS];
1030
1e3cc57e
JL		 1031 /*
1032 * With mount options, the last one should win. Reset any existing
1033 * settings back to default.
1034 */
1035 vol->sectype = Unspecified;
1036 vol->sign = false;
1037
8830d7e0 1038 switch (match_token(value, cifs_secflavor_tokens, args)) {
3f618223
JL		 1039 case Opt_sec_krb5p:
1040 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1041 return 1;
1042 case Opt_sec_krb5i:
1043 vol->sign = true;
1044 /* Fallthrough */
8830d7e0 1045 case Opt_sec_krb5:
1e3cc57e 1046 vol->sectype = Kerberos;
8830d7e0 1047 break;
3f618223 1048 case Opt_sec_ntlmsspi:
1e3cc57e 1049 vol->sign = true;
3f618223 1050 /* Fallthrough */
8830d7e0 1051 case Opt_sec_ntlmssp:
1e3cc57e 1052 vol->sectype = RawNTLMSSP;
8830d7e0 1053 break;
3f618223 1054 case Opt_sec_ntlmi:
1e3cc57e 1055 vol->sign = true;
3f618223 1056 /* Fallthrough */
8830d7e0 1057 case Opt_ntlm:
1e3cc57e 1058 vol->sectype = NTLM;
8830d7e0 1059 break;
3f618223 1060 case Opt_sec_ntlmv2i:
1e3cc57e 1061 vol->sign = true;
3f618223 1062 /* Fallthrough */
7659624f 1063 case Opt_sec_ntlmv2:
1e3cc57e 1064 vol->sectype = NTLMv2;
8830d7e0
SP		 1065 break;
1066#ifdef CONFIG_CIFS_WEAK_PW_HASH
1067 case Opt_sec_lanman:
1e3cc57e 1068 vol->sectype = LANMAN;
8830d7e0
SP		 1069 break;
1070#endif
1071 case Opt_sec_none:
1072 vol->nullauth = 1;
1073 break;
1074 default:
f96637be 1075 cifs_dbg(VFS, "bad security option: %s\n", value);
8830d7e0
SP		 1076 return 1;
1077 }
1078
1079 return 0;
1080}
1081
15b6a473
JL		 1082static int
1083cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1084{
1085 substring_t args[MAX_OPT_ARGS];
1086
1087 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1088 case Opt_cache_loose:
1089 vol->direct_io = false;
1090 vol->strict_io = false;
1091 break;
1092 case Opt_cache_strict:
1093 vol->direct_io = false;
1094 vol->strict_io = true;
1095 break;
1096 case Opt_cache_none:
1097 vol->direct_io = true;
1098 vol->strict_io = false;
1099 break;
1100 default:
f96637be 1101 cifs_dbg(VFS, "bad cache= option: %s\n", value);
15b6a473
JL		 1102 return 1;
1103 }
1104 return 0;
1105}
1106
23db65f5
JL		 1107static int
1108cifs_parse_smb_version(char *value, struct smb_vol *vol)
1109{
1110 substring_t args[MAX_OPT_ARGS];
1111
1112 switch (match_token(value, cifs_smb_version_tokens, args)) {
1113 case Smb_1:
1114 vol->ops = &smb1_operations;
1115 vol->vals = &smb1_values;
1116 break;
1080ef75 1117#ifdef CONFIG_CIFS_SMB2
dd446b16 1118 case Smb_20:
53ef1016 1119 vol->ops = &smb20_operations;
dd446b16
SF		 1120 vol->vals = &smb20_values;
1121 break;
1080ef75
SF		 1122 case Smb_21:
1123 vol->ops = &smb21_operations;
1124 vol->vals = &smb21_values;
1125 break;
e4aa25e7 1126 case Smb_30:
38107d45 1127 vol->ops = &smb30_operations;
e4aa25e7
SF		 1128 vol->vals = &smb30_values;
1129 break;
20b6d8b4
SF		 1130 case Smb_302:
1131 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1132 vol->vals = &smb302_values;
1133 break;
1080ef75 1134#endif
23db65f5 1135 default:
f96637be 1136 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
23db65f5
JL		 1137 return 1;
1138 }
1139 return 0;
1140}
1141
d387a5c5
JL		 1142/*
1143 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1144 * fields with the result. Returns 0 on success and an error otherwise.
1145 */
1146static int
1147cifs_parse_devname(const char *devname, struct smb_vol *vol)
1148{
1149 char *pos;
1150 const char *delims = "/\\";
1151 size_t len;
1152
1153 /* make sure we have a valid UNC double delimiter prefix */
1154 len = strspn(devname, delims);
1155 if (len != 2)
1156 return -EINVAL;
1157
1158 /* find delimiter between host and sharename */
1159 pos = strpbrk(devname + 2, delims);
1160 if (!pos)
1161 return -EINVAL;
1162
1163 /* skip past delimiter */
1164 ++pos;
1165
1166 /* now go until next delimiter or end of string */
1167 len = strcspn(pos, delims);
1168
1169 /* move "pos" up to delimiter or NULL */
1170 pos += len;
1171 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1172 if (!vol->UNC)
1173 return -ENOMEM;
1174
1175 convert_delimiter(vol->UNC, '\\');
1176
1177 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1178 if (!*pos++ || !*pos)
1179 return 0;
1180
1181 vol->prepath = kstrdup(pos, GFP_KERNEL);
1182 if (!vol->prepath)
1183 return -ENOMEM;
1184
1185 return 0;
1186}
1187
1da177e4 1188static int
b946845a 1189cifs_parse_mount_options(const char *mountdata, const char *devname,
50c2f753 1190 struct smb_vol *vol)
1da177e4 1191{
8830d7e0 1192 char *data, *end;
957df453 1193 char *mountdata_copy = NULL, *options;
1da177e4
LT		 1194 unsigned int temp_len, i, j;
1195 char separator[2];
9b9d6b24
JL		 1196 short int override_uid = -1;
1197 short int override_gid = -1;
1198 bool uid_specified = false;
1199 bool gid_specified = false;
d8162558
JL		 1200 bool sloppy = false;
1201 char *invalid = NULL;
88463999 1202 char *nodename = utsname()->nodename;
8830d7e0
SP		 1203 char *string = NULL;
1204 char *tmp_end, *value;
1205 char delim;
b979aaa1
JL		 1206 bool got_ip = false;
1207 unsigned short port = 0;
1208 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1da177e4
LT		 1209
1210 separator[0] = ',';
50c2f753 1211 separator[1] = 0;
8830d7e0 1212 delim = separator[0];
1da177e4 1213
6ee9542a
JL		 1214 /* ensure we always start with zeroed-out smb_vol */
1215 memset(vol, 0, sizeof(*vol));
1216
88463999
JL		 1217 /*
1218 * does not have to be perfect mapping since field is
1219 * informational, only used for servers that do not support
1220 * port 445 and it can be overridden at mount time
1221 */
1397f2ee
JL		 1222 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1223 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
88463999
JL		 1224 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1225
1397f2ee 1226 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
a10faeb2
SF		 1227 /* null target name indicates to use *SMBSERVR default called name
1228 if we end up sending RFC1001 session initialize */
1229 vol->target_rfc1001_name[0] = 0;
3e4b3e1f
JL		 1230 vol->cred_uid = current_uid();
1231 vol->linux_uid = current_uid();
a001e5b5 1232 vol->linux_gid = current_gid();
f55ed1a8
JL		 1233
1234 /* default to only allowing write access to owner of the mount */
1235 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1da177e4
LT		 1236
1237 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
ac67055e
JA		 1238 /* default is always to request posix paths. */
1239 vol->posix_paths = 1;
a0c9217f
JL		 1240 /* default to using server inode numbers where available */
1241 vol->server_ino = 1;
ac67055e 1242
1b359204
JL		 1243 /* default is to use strict cifs caching semantics */
1244 vol->strict_io = true;
1245
6d20e840
SJ		 1246 vol->actimeo = CIFS_DEF_ACTIMEO;
1247
23db65f5
JL		 1248 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1249 vol->ops = &smb1_operations;
1250 vol->vals = &smb1_values;
1251
b946845a
SF		 1252 if (!mountdata)
1253 goto cifs_parse_mount_err;
1254
1255 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1256 if (!mountdata_copy)
1257 goto cifs_parse_mount_err;
1da177e4 1258
b946845a 1259 options = mountdata_copy;
4906e50b 1260 end = options + strlen(options);
8830d7e0 1261
50c2f753 1262 if (strncmp(options, "sep=", 4) == 0) {
fb8c4b14 1263 if (options[4] != 0) {
1da177e4
LT		 1264 separator[0] = options[4];
1265 options += 5;
1266 } else {
f96637be 1267 cifs_dbg(FYI, "Null separator not allowed\n");
1da177e4
LT		 1268 }
1269 }
3d3ea8e6
SP		 1270 vol->backupuid_specified = false; /* no backup intent for a user */
1271 vol->backupgid_specified = false; /* no backup intent for a group */
50c2f753 1272
37d4f99b
JL		 1273 switch (cifs_parse_devname(devname, vol)) {
1274 case 0:
1275 break;
1276 case -ENOMEM:
1277 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1278 goto cifs_parse_mount_err;
1279 case -EINVAL:
1280 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1281 goto cifs_parse_mount_err;
1282 default:
1283 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1284 goto cifs_parse_mount_err;
d387a5c5
JL		 1285 }
1286
1da177e4 1287 while ((data = strsep(&options, separator)) != NULL) {
8830d7e0
SP		 1288 substring_t args[MAX_OPT_ARGS];
1289 unsigned long option;
1290 int token;
1291
1da177e4
LT		 1292 if (!*data)
1293 continue;
1da177e4 1294
8830d7e0
SP		 1295 token = match_token(data, cifs_mount_option_tokens, args);
1296
1297 switch (token) {
1298
1299 /* Ingnore the following */
1300 case Opt_ignore:
1301 break;
1302
1303 /* Boolean values */
1304 case Opt_user_xattr:
1da177e4 1305 vol->no_xattr = 0;
8830d7e0
SP		 1306 break;
1307 case Opt_nouser_xattr:
1da177e4 1308 vol->no_xattr = 1;
8830d7e0
SP		 1309 break;
1310 case Opt_forceuid:
9b9d6b24 1311 override_uid = 1;
8830d7e0
SP		 1312 break;
1313 case Opt_noforceuid:
9b9d6b24 1314 override_uid = 0;
8830d7e0 1315 break;
72bd481f
JL		 1316 case Opt_forcegid:
1317 override_gid = 1;
1318 break;
1319 case Opt_noforcegid:
1320 override_gid = 0;
1321 break;
8830d7e0 1322 case Opt_noblocksend:
edf1ae40 1323 vol->noblocksnd = 1;
8830d7e0
SP		 1324 break;
1325 case Opt_noautotune:
edf1ae40 1326 vol->noautotune = 1;
8830d7e0
SP		 1327 break;
1328 case Opt_hard:
1da177e4 1329 vol->retry = 1;
8830d7e0
SP		 1330 break;
1331 case Opt_soft:
1da177e4 1332 vol->retry = 0;
8830d7e0
SP		 1333 break;
1334 case Opt_perm:
1da177e4 1335 vol->noperm = 0;
8830d7e0
SP		 1336 break;
1337 case Opt_noperm:
1da177e4 1338 vol->noperm = 1;
8830d7e0
SP		 1339 break;
1340 case Opt_mapchars:
6a0b4824 1341 vol->remap = 1;
8830d7e0
SP		 1342 break;
1343 case Opt_nomapchars:
6a0b4824 1344 vol->remap = 0;
8830d7e0
SP		 1345 break;
1346 case Opt_sfu:
50c2f753 1347 vol->sfu_emul = 1;
8830d7e0
SP		 1348 break;
1349 case Opt_nosfu:
50c2f753 1350 vol->sfu_emul = 0;
8830d7e0
SP		 1351 break;
1352 case Opt_nodfs:
2c1b8615 1353 vol->nodfs = 1;
8830d7e0
SP		 1354 break;
1355 case Opt_posixpaths:
ac67055e 1356 vol->posix_paths = 1;
8830d7e0
SP		 1357 break;
1358 case Opt_noposixpaths:
ac67055e 1359 vol->posix_paths = 0;
8830d7e0
SP		 1360 break;
1361 case Opt_nounix:
c18c842b 1362 vol->no_linux_ext = 1;
8830d7e0
SP		 1363 break;
1364 case Opt_nocase:
50c2f753 1365 vol->nocase = 1;
8830d7e0
SP		 1366 break;
1367 case Opt_brl:
c46fa8ac 1368 vol->nobrl = 0;
8830d7e0
SP		 1369 break;
1370 case Opt_nobrl:
c46fa8ac 1371 vol->nobrl = 1;
5cfdddcf
PS		 1372 /*
1373 * turn off mandatory locking in mode
8830d7e0 1374 * if remote locking is turned off since the
5cfdddcf
PS		 1375 * local vfs will do advisory
1376 */
50c2f753
SF		 1377 if (vol->file_mode ==
1378 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
d3485d37 1379 vol->file_mode = S_IALLUGO;
8830d7e0
SP		 1380 break;
1381 case Opt_forcemandatorylock:
13a6e42a 1382 vol->mand_lock = 1;
8830d7e0
SP		 1383 break;
1384 case Opt_setuids:
1da177e4 1385 vol->setuids = 1;
8830d7e0
SP		 1386 break;
1387 case Opt_nosetuids:
1da177e4 1388 vol->setuids = 0;
8830d7e0
SP		 1389 break;
1390 case Opt_dynperm:
d0a9c078 1391 vol->dynperm = true;
8830d7e0
SP		 1392 break;
1393 case Opt_nodynperm:
d0a9c078 1394 vol->dynperm = false;
8830d7e0
SP		 1395 break;
1396 case Opt_nohard:
1da177e4 1397 vol->retry = 0;
8830d7e0
SP		 1398 break;
1399 case Opt_nosoft:
1da177e4 1400 vol->retry = 1;
8830d7e0
SP		 1401 break;
1402 case Opt_nointr:
1da177e4 1403 vol->intr = 0;
8830d7e0
SP		 1404 break;
1405 case Opt_intr:
1da177e4 1406 vol->intr = 1;
8830d7e0
SP		 1407 break;
1408 case Opt_nostrictsync:
be652445 1409 vol->nostrictsync = 1;
8830d7e0
SP		 1410 break;
1411 case Opt_strictsync:
be652445 1412 vol->nostrictsync = 0;
8830d7e0
SP		 1413 break;
1414 case Opt_serverino:
1da177e4 1415 vol->server_ino = 1;
8830d7e0
SP		 1416 break;
1417 case Opt_noserverino:
1da177e4 1418 vol->server_ino = 0;
8830d7e0
SP		 1419 break;
1420 case Opt_rwpidforward:
d4ffff1f 1421 vol->rwpidforward = 1;
8830d7e0
SP		 1422 break;
1423 case Opt_cifsacl:
0a4b92c0 1424 vol->cifs_acl = 1;
8830d7e0
SP		 1425 break;
1426 case Opt_nocifsacl:
0a4b92c0 1427 vol->cifs_acl = 0;
8830d7e0
SP		 1428 break;
1429 case Opt_acl:
1da177e4 1430 vol->no_psx_acl = 0;
8830d7e0
SP		 1431 break;
1432 case Opt_noacl:
1da177e4 1433 vol->no_psx_acl = 1;
8830d7e0
SP		 1434 break;
1435 case Opt_locallease:
84210e91 1436 vol->local_lease = 1;
8830d7e0
SP		 1437 break;
1438 case Opt_sign:
1e3cc57e 1439 vol->sign = true;
8830d7e0
SP		 1440 break;
1441 case Opt_seal:
95b1cb90 1442 /* we do not do the following in secFlags because seal
8830d7e0
SP		 1443 * is a per tree connection (mount) not a per socket
1444 * or per-smb connection option in the protocol
1445 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1446 */
95b1cb90 1447 vol->seal = 1;
8830d7e0 1448 break;
8830d7e0 1449 case Opt_noac:
50c2f753
SF		 1450 printk(KERN_WARNING "CIFS: Mount option noac not "
1451 "supported. Instead set "
1452 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
8830d7e0
SP		 1453 break;
1454 case Opt_fsc:
607a569d 1455#ifndef CONFIG_CIFS_FSCACHE
f96637be 1456 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
b946845a 1457 goto cifs_parse_mount_err;
607a569d 1458#endif
fa1df75d 1459 vol->fsc = true;
8830d7e0
SP		 1460 break;
1461 case Opt_mfsymlinks:
736a3320 1462 vol->mfsymlinks = true;
8830d7e0
SP		 1463 break;
1464 case Opt_multiuser:
0eb8a132 1465 vol->multiuser = true;
8830d7e0 1466 break;
d8162558
JL		 1467 case Opt_sloppy:
1468 sloppy = true;
1469 break;
a0b3df5c
JL		 1470 case Opt_nosharesock:
1471 vol->nosharesock = true;
1472 break;
8830d7e0
SP		 1473
1474 /* Numeric Values */
1475 case Opt_backupuid:
3da46565 1476 if (get_option_uid(args, &vol->backupuid)) {
f96637be
JP		 1477 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1478 __func__);
3d3ea8e6
SP		 1479 goto cifs_parse_mount_err;
1480 }
1481 vol->backupuid_specified = true;
8830d7e0
SP		 1482 break;
1483 case Opt_backupgid:
3da46565 1484 if (get_option_gid(args, &vol->backupgid)) {
f96637be
JP		 1485 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1486 __func__);
3d3ea8e6
SP		 1487 goto cifs_parse_mount_err;
1488 }
1489 vol->backupgid_specified = true;
8830d7e0
SP		 1490 break;
1491 case Opt_uid:
3da46565 1492 if (get_option_uid(args, &vol->linux_uid)) {
f96637be
JP		 1493 cifs_dbg(VFS, "%s: Invalid uid value\n",
1494 __func__);
8830d7e0
SP		 1495 goto cifs_parse_mount_err;
1496 }
8830d7e0
SP		 1497 uid_specified = true;
1498 break;
1499 case Opt_cruid:
3da46565 1500 if (get_option_uid(args, &vol->cred_uid)) {
f96637be
JP		 1501 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1502 __func__);
8830d7e0
SP		 1503 goto cifs_parse_mount_err;
1504 }
8830d7e0
SP		 1505 break;
1506 case Opt_gid:
3da46565 1507 if (get_option_gid(args, &vol->linux_gid)) {
f96637be
JP		 1508 cifs_dbg(VFS, "%s: Invalid gid value\n",
1509 __func__);
8830d7e0
SP		 1510 goto cifs_parse_mount_err;
1511 }
8830d7e0
SP		 1512 gid_specified = true;
1513 break;
1514 case Opt_file_mode:
1515 if (get_option_ul(args, &option)) {
f96637be
JP		 1516 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1517 __func__);
8830d7e0
SP		 1518 goto cifs_parse_mount_err;
1519 }
1520 vol->file_mode = option;
1521 break;
1522 case Opt_dirmode:
1523 if (get_option_ul(args, &option)) {
f96637be
JP		 1524 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1525 __func__);
8830d7e0
SP		 1526 goto cifs_parse_mount_err;
1527 }
1528 vol->dir_mode = option;
1529 break;
1530 case Opt_port:
b979aaa1
JL		 1531 if (get_option_ul(args, &option) ||
1532 option > USHRT_MAX) {
f96637be
JP		 1533 cifs_dbg(VFS, "%s: Invalid port value\n",
1534 __func__);
8830d7e0
SP		 1535 goto cifs_parse_mount_err;
1536 }
b979aaa1 1537 port = (unsigned short)option;
8830d7e0
SP		 1538 break;
1539 case Opt_rsize:
1540 if (get_option_ul(args, &option)) {
f96637be
JP		 1541 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1542 __func__);
b946845a 1543 goto cifs_parse_mount_err;
8830d7e0
SP		 1544 }
1545 vol->rsize = option;
1546 break;
1547 case Opt_wsize:
1548 if (get_option_ul(args, &option)) {
f96637be
JP		 1549 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1550 __func__);
8830d7e0
SP		 1551 goto cifs_parse_mount_err;
1552 }
1553 vol->wsize = option;
1554 break;
1555 case Opt_actimeo:
1556 if (get_option_ul(args, &option)) {
f96637be
JP		 1557 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1558 __func__);
8830d7e0
SP		 1559 goto cifs_parse_mount_err;
1560 }
1561 vol->actimeo = HZ * option;
1562 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
f96637be 1563 cifs_dbg(VFS, "attribute cache timeout too large\n");
8830d7e0
SP		 1564 goto cifs_parse_mount_err;
1565 }
1566 break;
1567
1568 /* String Arguments */
1569
4fe9e963
SP		 1570 case Opt_blank_user:
1571 /* null user, ie. anonymous authentication */
1572 vol->nullauth = 1;
1573 vol->username = NULL;
1574 break;
8830d7e0
SP		 1575 case Opt_user:
1576 string = match_strdup(args);
1577 if (string == NULL)
1578 goto out_nomem;
1579
8c3a2b4c
SL		 1580 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1581 CIFS_MAX_USERNAME_LEN) {
8830d7e0
SP		 1582 printk(KERN_WARNING "CIFS: username too long\n");
1583 goto cifs_parse_mount_err;
1584 }
1585 vol->username = kstrdup(string, GFP_KERNEL);
f96637be 1586 if (!vol->username)
8830d7e0 1587 goto cifs_parse_mount_err;
8830d7e0
SP		 1588 break;
1589 case Opt_blank_pass:
8830d7e0
SP		 1590 /* passwords have to be handled differently
1591 * to allow the character used for deliminator
1592 * to be passed within them
1593 */
1594
c369c9a4
SP		 1595 /*
1596 * Check if this is a case where the password
1597 * starts with a delimiter
1598 */
1599 tmp_end = strchr(data, '=');
1600 tmp_end++;
1601 if (!(tmp_end < end && tmp_end[1] == delim)) {
1602 /* No it is not. Set the password to NULL */
1603 vol->password = NULL;
1604 break;
1605 }
1606 /* Yes it is. Drop down to Opt_pass below.*/
1607 case Opt_pass:
8830d7e0
SP		 1608 /* Obtain the value string */
1609 value = strchr(data, '=');
10238074 1610 value++;
8830d7e0
SP		 1611
1612 /* Set tmp_end to end of the string */
1613 tmp_end = (char *) value + strlen(value);
1614
1615 /* Check if following character is the deliminator
1616 * If yes, we have encountered a double deliminator
1617 * reset the NULL character to the deliminator
1618 */
e73f843a 1619 if (tmp_end < end && tmp_end[1] == delim) {
8830d7e0
SP		 1620 tmp_end[0] = delim;
1621
e73f843a
SJ		 1622 /* Keep iterating until we get to a single
1623 * deliminator OR the end
1624 */
1625 while ((tmp_end = strchr(tmp_end, delim))
1626 != NULL && (tmp_end[1] == delim)) {
1627 tmp_end = (char *) &tmp_end[2];
1628 }
1629
1630 /* Reset var options to point to next element */
1631 if (tmp_end) {
1632 tmp_end[0] = '\0';
1633 options = (char *) &tmp_end[1];
1634 } else
1635 /* Reached the end of the mount option
1636 * string */
1637 options = end;
8830d7e0
SP		 1638 }
1639
8830d7e0
SP		 1640 /* Now build new password string */
1641 temp_len = strlen(value);
1642 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1643 if (vol->password == NULL) {
1644 printk(KERN_WARNING "CIFS: no memory "
1645 "for password\n");
1646 goto cifs_parse_mount_err;
1647 }
1648
1649 for (i = 0, j = 0; i < temp_len; i++, j++) {
1650 vol->password[j] = value[i];
1651 if ((value[i] == delim) &&
1652 value[i+1] == delim)
1653 /* skip the second deliminator */
1654 i++;
1655 }
1656 vol->password[j] = '\0';
1657 break;
4fe9e963 1658 case Opt_blank_ip:
b979aaa1
JL		 1659 /* FIXME: should this be an error instead? */
1660 got_ip = false;
4fe9e963 1661 break;
8830d7e0
SP		 1662 case Opt_ip:
1663 string = match_strdup(args);
1664 if (string == NULL)
1665 goto out_nomem;
1666
b979aaa1
JL		 1667 if (!cifs_convert_address(dstaddr, string,
1668 strlen(string))) {
1669 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1670 string);
8830d7e0
SP		 1671 goto cifs_parse_mount_err;
1672 }
b979aaa1 1673 got_ip = true;
8830d7e0 1674 break;
8830d7e0
SP		 1675 case Opt_domain:
1676 string = match_strdup(args);
1677 if (string == NULL)
1678 goto out_nomem;
1679
057d6332
CG		 1680 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1681 == CIFS_MAX_DOMAINNAME_LEN) {
8830d7e0
SP		 1682 printk(KERN_WARNING "CIFS: domain name too"
1683 " long\n");
1684 goto cifs_parse_mount_err;
1685 }
1686
1687 vol->domainname = kstrdup(string, GFP_KERNEL);
1688 if (!vol->domainname) {
1689 printk(KERN_WARNING "CIFS: no memory "
1690 "for domainname\n");
1691 goto cifs_parse_mount_err;
1692 }
f96637be 1693 cifs_dbg(FYI, "Domain name set\n");
8830d7e0
SP		 1694 break;
1695 case Opt_srcaddr:
1696 string = match_strdup(args);
1697 if (string == NULL)
1698 goto out_nomem;
1699
4fe9e963 1700 if (!cifs_convert_address(
8830d7e0
SP		 1701 (struct sockaddr *)&vol->srcaddr,
1702 string, strlen(string))) {
1703 printk(KERN_WARNING "CIFS: Could not parse"
1704 " srcaddr: %s\n", string);
1705 goto cifs_parse_mount_err;
1706 }
1707 break;
8830d7e0
SP		 1708 case Opt_iocharset:
1709 string = match_strdup(args);
1710 if (string == NULL)
1711 goto out_nomem;
1712
4fe9e963 1713 if (strnlen(string, 1024) >= 65) {
8830d7e0
SP		 1714 printk(KERN_WARNING "CIFS: iocharset name "
1715 "too long.\n");
1716 goto cifs_parse_mount_err;
1717 }
1718
1719 if (strnicmp(string, "default", 7) != 0) {
1720 vol->iocharset = kstrdup(string,
1721 GFP_KERNEL);
1722 if (!vol->iocharset) {
1723 printk(KERN_WARNING "CIFS: no memory"
1724 "for charset\n");
1725 goto cifs_parse_mount_err;
1726 }
1727 }
1728 /* if iocharset not set then load_nls_default
1729 * is used by caller
1730 */
f96637be 1731 cifs_dbg(FYI, "iocharset set to %s\n", string);
8830d7e0 1732 break;
8830d7e0
SP		 1733 case Opt_netbiosname:
1734 string = match_strdup(args);
1735 if (string == NULL)
1736 goto out_nomem;
1737
8830d7e0
SP		 1738 memset(vol->source_rfc1001_name, 0x20,
1739 RFC1001_NAME_LEN);
1740 /*
1741 * FIXME: are there cases in which a comma can
1742 * be valid in workstation netbios name (and
1743 * need special handling)?
1744 */
1745 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1746 /* don't ucase netbiosname for user */
1747 if (string[i] == 0)
1748 break;
1749 vol->source_rfc1001_name[i] = string[i];
1750 }
1751 /* The string has 16th byte zero still from
1752 * set at top of the function
1753 */
1754 if (i == RFC1001_NAME_LEN && string[i] != 0)
1755 printk(KERN_WARNING "CIFS: netbiosname"
1756 " longer than 15 truncated.\n");
1757
1758 break;
1759 case Opt_servern:
1760 /* servernetbiosname specified override *SMBSERVER */
1761 string = match_strdup(args);
1762 if (string == NULL)
1763 goto out_nomem;
1764
8830d7e0
SP		 1765 /* last byte, type, is 0x20 for servr type */
1766 memset(vol->target_rfc1001_name, 0x20,
1767 RFC1001_NAME_LEN_WITH_NULL);
1768
1769 /* BB are there cases in which a comma can be
1770 valid in this workstation netbios name
1771 (and need special handling)? */
1772
1773 /* user or mount helper must uppercase the
1774 netbios name */
1775 for (i = 0; i < 15; i++) {
1776 if (string[i] == 0)
1777 break;
1778 vol->target_rfc1001_name[i] = string[i];
1779 }
1780 /* The string has 16th byte zero still from
1781 set at top of the function */
1782 if (i == RFC1001_NAME_LEN && string[i] != 0)
1783 printk(KERN_WARNING "CIFS: server net"
1784 "biosname longer than 15 truncated.\n");
1785 break;
1786 case Opt_ver:
1787 string = match_strdup(args);
1788 if (string == NULL)
1789 goto out_nomem;
1790
5249af32 1791 if (strnicmp(string, "1", 1) == 0) {
8830d7e0
SP		 1792 /* This is the default */
1793 break;
1794 }
1795 /* For all other value, error */
1796 printk(KERN_WARNING "CIFS: Invalid version"
1797 " specified\n");
b946845a 1798 goto cifs_parse_mount_err;
23db65f5
JL		 1799 case Opt_vers:
1800 string = match_strdup(args);
1801 if (string == NULL)
1802 goto out_nomem;
1803
1804 if (cifs_parse_smb_version(string, vol) != 0)
1805 goto cifs_parse_mount_err;
1806 break;
8830d7e0
SP		 1807 case Opt_sec:
1808 string = match_strdup(args);
1809 if (string == NULL)
1810 goto out_nomem;
1811
8830d7e0
SP		 1812 if (cifs_parse_security_flavors(string, vol) != 0)
1813 goto cifs_parse_mount_err;
1814 break;
15b6a473
JL		 1815 case Opt_cache:
1816 string = match_strdup(args);
1817 if (string == NULL)
1818 goto out_nomem;
1819
1820 if (cifs_parse_cache_flavor(string, vol) != 0)
1821 goto cifs_parse_mount_err;
1822 break;
8830d7e0 1823 default:
d8162558
JL		 1824 /*
1825 * An option we don't recognize. Save it off for later
1826 * if we haven't already found one
1827 */
1828 if (!invalid)
1829 invalid = data;
8830d7e0 1830 break;
1da177e4 1831 }
8830d7e0
SP		 1832 /* Free up any allocated string */
1833 kfree(string);
1834 string = NULL;
1da177e4 1835 }
0eb8a132 1836
d8162558
JL		 1837 if (!sloppy && invalid) {
1838 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1839 goto cifs_parse_mount_err;
1840 }
1841
8a8798a5
JL		 1842#ifndef CONFIG_KEYS
1843 /* Muliuser mounts require CONFIG_KEYS support */
1844 if (vol->multiuser) {
f96637be 1845 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
b946845a 1846 goto cifs_parse_mount_err;
0eb8a132 1847 }
8a8798a5 1848#endif
e5e69abd 1849 if (!vol->UNC) {
37d4f99b 1850 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
e5e69abd
JL		 1851 goto cifs_parse_mount_err;
1852 }
0eb8a132 1853
62a1a439
JL		 1854 /* make sure UNC has a share name */
1855 if (!strchr(vol->UNC + 3, '\\')) {
f96637be 1856 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
62a1a439
JL		 1857 goto cifs_parse_mount_err;
1858 }
1859
b979aaa1
JL		 1860 if (!got_ip) {
1861 /* No ip= option specified? Try to get it from UNC */
1862 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1863 strlen(&vol->UNC[2]))) {
1864 printk(KERN_ERR "Unable to determine destination "
1865 "address.\n");
1866 goto cifs_parse_mount_err;
1867 }
1868 }
1869
1870 /* set the port that we got earlier */
1871 cifs_set_port(dstaddr, port);
1da177e4 1872
9b9d6b24
JL		 1873 if (uid_specified)
1874 vol->override_uid = override_uid;
1875 else if (override_uid == 1)
1876 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1877 "specified with no uid= option.\n");
1878
1879 if (gid_specified)
1880 vol->override_gid = override_gid;
1881 else if (override_gid == 1)
1882 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1883 "specified with no gid= option.\n");
1884
b946845a 1885 kfree(mountdata_copy);
1da177e4 1886 return 0;
b946845a 1887
8830d7e0
SP		 1888out_nomem:
1889 printk(KERN_WARNING "Could not allocate temporary buffer\n");
b946845a 1890cifs_parse_mount_err:
8830d7e0 1891 kfree(string);
b946845a
SF		 1892 kfree(mountdata_copy);
1893 return 1;
1da177e4
LT		 1894}
1895
3eb9a889
BG		 1896/** Returns true if srcaddr isn't specified and rhs isn't
1897 * specified, or if srcaddr is specified and
1898 * matches the IP address of the rhs argument.
1899 */
1900static bool
1901srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1902{
1903 switch (srcaddr->sa_family) {
1904 case AF_UNSPEC:
1905 return (rhs->sa_family == AF_UNSPEC);
1906 case AF_INET: {
1907 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1908 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1909 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1910 }
1911 case AF_INET6: {
1912 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
e3e2775c 1913 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
3eb9a889
BG		 1914 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1915 }
1916 default:
1917 WARN_ON(1);
1918 return false; /* don't expect to be here */
1919 }
1920}
1921
4b886136
PS		 1922/*
1923 * If no port is specified in addr structure, we try to match with 445 port
1924 * and if it fails - with 139 ports. It should be called only if address
1925 * families of server and addr are equal.
1926 */
1927static bool
1928match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1929{
6da97910 1930 __be16 port, *sport;
4b886136
PS		 1931
1932 switch (addr->sa_family) {
1933 case AF_INET:
1934 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1935 port = ((struct sockaddr_in *) addr)->sin_port;
1936 break;
1937 case AF_INET6:
1938 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1939 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1940 break;
1941 default:
1942 WARN_ON(1);
1943 return false;
1944 }
1945
1946 if (!port) {
1947 port = htons(CIFS_PORT);
1948 if (port == *sport)
1949 return true;
1950
1951 port = htons(RFC1001_PORT);
1952 }
1953
1954 return port == *sport;
1955}
3eb9a889 1956
4515148e 1957static bool
3eb9a889
BG		 1958match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1959 struct sockaddr *srcaddr)
4515148e 1960{
4515148e 1961 switch (addr->sa_family) {
a9f1b85e
PS		 1962 case AF_INET: {
1963 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1964 struct sockaddr_in *srv_addr4 =
1965 (struct sockaddr_in *)&server->dstaddr;
1966
1967 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
4515148e 1968 return false;
4515148e 1969 break;
a9f1b85e
PS		 1970 }
1971 case AF_INET6: {
1972 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1973 struct sockaddr_in6 *srv_addr6 =
1974 (struct sockaddr_in6 *)&server->dstaddr;
1975
4515148e 1976 if (!ipv6_addr_equal(&addr6->sin6_addr,
a9f1b85e 1977 &srv_addr6->sin6_addr))
4515148e 1978 return false;
a9f1b85e 1979 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
4515148e 1980 return false;
4515148e
JL		 1981 break;
1982 }
a9f1b85e
PS		 1983 default:
1984 WARN_ON(1);
1985 return false; /* don't expect to be here */
1986 }
4515148e 1987
3eb9a889
BG		 1988 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1989 return false;
1990
4515148e
JL		 1991 return true;
1992}
1993
daf5b0b6
JL		 1994static bool
1995match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1996{
3f618223
JL		 1997 /*
1998 * The select_sectype function should either return the vol->sectype
1999 * that was specified, or "Unspecified" if that sectype was not
2000 * compatible with the given NEGOTIATE request.
2001 */
2002 if (select_sectype(server, vol->sectype) == Unspecified)
daf5b0b6 2003 return false;
daf5b0b6 2004
3f618223
JL		 2005 /*
2006 * Now check if signing mode is acceptable. No need to check
2007 * global_secflags at this point since if MUST_SIGN is set then
2008 * the server->sign had better be too.
2009 */
38d77c50
JL		 2010 if (vol->sign && !server->sign)
2011 return false;
daf5b0b6
JL		 2012
2013 return true;
2014}
2015
9fa114f7 2016static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
37bb04e5 2017{
9fa114f7
JL		 2018 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2019
a0b3df5c
JL		 2020 if (vol->nosharesock)
2021 return 0;
2022
23db65f5
JL		 2023 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2024 return 0;
2025
37bb04e5
PS		 2026 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2027 return 0;
2028
2029 if (!match_address(server, addr,
2030 (struct sockaddr *)&vol->srcaddr))
2031 return 0;
2032
2033 if (!match_port(server, addr))
2034 return 0;
2035
2036 if (!match_security(server, vol))
2037 return 0;
2038
2039 return 1;
2040}
2041
e7ddee90 2042static struct TCP_Server_Info *
9fa114f7 2043cifs_find_tcp_session(struct smb_vol *vol)
1da177e4 2044{
e7ddee90 2045 struct TCP_Server_Info *server;
e7ddee90 2046
3f9bcca7 2047 spin_lock(&cifs_tcp_ses_lock);
4515148e 2048 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
9fa114f7 2049 if (!match_server(server, vol))
daf5b0b6
JL		 2050 continue;
2051
e7ddee90 2052 ++server->srv_count;
3f9bcca7 2053 spin_unlock(&cifs_tcp_ses_lock);
f96637be 2054 cifs_dbg(FYI, "Existing tcp session with server found\n");
e7ddee90 2055 return server;
1da177e4 2056 }
3f9bcca7 2057 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2058 return NULL;
2059}
1b20d672 2060
14fbf50d 2061static void
e7ddee90 2062cifs_put_tcp_session(struct TCP_Server_Info *server)
1da177e4 2063{
e7ddee90 2064 struct task_struct *task;
1b20d672 2065
3f9bcca7 2066 spin_lock(&cifs_tcp_ses_lock);
e7ddee90 2067 if (--server->srv_count > 0) {
3f9bcca7 2068 spin_unlock(&cifs_tcp_ses_lock);
e7ddee90 2069 return;
1da177e4 2070 }
1b20d672 2071
f1d0c998
RL		 2072 put_net(cifs_net_ns(server));
2073
e7ddee90 2074 list_del_init(&server->tcp_ses_list);
3f9bcca7 2075 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2076
c74093b6
JL		 2077 cancel_delayed_work_sync(&server->echo);
2078
e7ddee90
JL		 2079 spin_lock(&GlobalMid_Lock);
2080 server->tcpStatus = CifsExiting;
2081 spin_unlock(&GlobalMid_Lock);
dea570e0 2082
d2b91521 2083 cifs_crypto_shash_release(server);
488f1d2d
SJ		 2084 cifs_fscache_release_client_cookie(server);
2085
21e73393
SP		 2086 kfree(server->session_key.response);
2087 server->session_key.response = NULL;
2088 server->session_key.len = 0;
2089
e7ddee90
JL		 2090 task = xchg(&server->tsk, NULL);
2091 if (task)
2092 force_sig(SIGKILL, task);
1da177e4
LT		 2093}
2094
63c038c2
JL		 2095static struct TCP_Server_Info *
2096cifs_get_tcp_session(struct smb_vol *volume_info)
2097{
2098 struct TCP_Server_Info *tcp_ses = NULL;
63c038c2
JL		 2099 int rc;
2100
f96637be 2101 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
63c038c2
JL		 2102
2103 /* see if we already have a matching tcp_ses */
9fa114f7 2104 tcp_ses = cifs_find_tcp_session(volume_info);
63c038c2
JL		 2105 if (tcp_ses)
2106 return tcp_ses;
2107
2108 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2109 if (!tcp_ses) {
2110 rc = -ENOMEM;
2111 goto out_err;
2112 }
2113
23db65f5
JL		 2114 tcp_ses->ops = volume_info->ops;
2115 tcp_ses->vals = volume_info->vals;
f1d0c998 2116 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
63c038c2
JL		 2117 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2118 if (IS_ERR(tcp_ses->hostname)) {
2119 rc = PTR_ERR(tcp_ses->hostname);
f7c5445a 2120 goto out_err_crypto_release;
63c038c2
JL		 2121 }
2122
2123 tcp_ses->noblocksnd = volume_info->noblocksnd;
2124 tcp_ses->noautotune = volume_info->noautotune;
6a5fa236 2125 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
fc40f9cf 2126 tcp_ses->in_flight = 0;
2d86dbc9 2127 tcp_ses->credits = 1;
63c038c2
JL		 2128 init_waitqueue_head(&tcp_ses->response_q);
2129 init_waitqueue_head(&tcp_ses->request_q);
2130 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2131 mutex_init(&tcp_ses->srv_mutex);
2132 memcpy(tcp_ses->workstation_RFC1001_name,
2133 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2134 memcpy(tcp_ses->server_RFC1001_name,
2135 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
5d0d2882 2136 tcp_ses->session_estab = false;
63c038c2 2137 tcp_ses->sequence_number = 0;
fda35943 2138 tcp_ses->lstrp = jiffies;
58fa015f 2139 spin_lock_init(&tcp_ses->req_lock);
63c038c2
JL		 2140 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2141 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
c74093b6 2142 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
9fa114f7
JL		 2143 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2144 sizeof(tcp_ses->srcaddr));
2145 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2146 sizeof(tcp_ses->dstaddr));
39552ea8
SP		 2147#ifdef CONFIG_CIFS_SMB2
2148 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2149#endif
63c038c2
JL		 2150 /*
2151 * at this point we are the only ones with the pointer
2152 * to the struct since the kernel thread not created yet
2153 * no need to spinlock this init of tcpStatus or srv_count
2154 */
2155 tcp_ses->tcpStatus = CifsNew;
2156 ++tcp_ses->srv_count;
2157
a9f1b85e 2158 rc = ip_connect(tcp_ses);
63c038c2 2159 if (rc < 0) {
f96637be 2160 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
f7c5445a 2161 goto out_err_crypto_release;
63c038c2
JL		 2162 }
2163
2164 /*
2165 * since we're in a cifs function already, we know that
2166 * this will succeed. No need for try_module_get().
2167 */
2168 __module_get(THIS_MODULE);
7c97c200 2169 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
63c038c2
JL		 2170 tcp_ses, "cifsd");
2171 if (IS_ERR(tcp_ses->tsk)) {
2172 rc = PTR_ERR(tcp_ses->tsk);
f96637be 2173 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
63c038c2 2174 module_put(THIS_MODULE);
f7c5445a 2175 goto out_err_crypto_release;
63c038c2 2176 }
fd88ce93 2177 tcp_ses->tcpStatus = CifsNeedNegotiate;
63c038c2
JL		 2178
2179 /* thread spawned, put it on the list */
3f9bcca7 2180 spin_lock(&cifs_tcp_ses_lock);
63c038c2 2181 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
3f9bcca7 2182 spin_unlock(&cifs_tcp_ses_lock);
63c038c2 2183
488f1d2d
SJ		 2184 cifs_fscache_get_client_cookie(tcp_ses);
2185
c74093b6 2186 /* queue echo request delayed work */
da472fc8 2187 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
c74093b6 2188
63c038c2
JL		 2189 return tcp_ses;
2190
f7c5445a 2191out_err_crypto_release:
d2b91521
SP		 2192 cifs_crypto_shash_release(tcp_ses);
2193
f1d0c998
RL		 2194 put_net(cifs_net_ns(tcp_ses));
2195
63c038c2
JL		 2196out_err:
2197 if (tcp_ses) {
8347a5cd
SF		 2198 if (!IS_ERR(tcp_ses->hostname))
2199 kfree(tcp_ses->hostname);
63c038c2
JL		 2200 if (tcp_ses->ssocket)
2201 sock_release(tcp_ses->ssocket);
2202 kfree(tcp_ses);
2203 }
2204 return ERR_PTR(rc);
2205}
2206
96daf2b0 2207static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
37bb04e5 2208{
3f618223
JL		 2209 if (vol->sectype != Unspecified &&
2210 vol->sectype != ses->sectype)
2211 return 0;
2212
2213 switch (ses->sectype) {
37bb04e5 2214 case Kerberos:
64ed39dd 2215 if (!uid_eq(vol->cred_uid, ses->cred_uid))
37bb04e5
PS		 2216 return 0;
2217 break;
2218 default:
04febabc
JL		 2219 /* NULL username means anonymous session */
2220 if (ses->user_name == NULL) {
2221 if (!vol->nullauth)
2222 return 0;
2223 break;
2224 }
2225
37bb04e5 2226 /* anything else takes username/password */
04febabc
JL		 2227 if (strncmp(ses->user_name,
2228 vol->username ? vol->username : "",
8c3a2b4c 2229 CIFS_MAX_USERNAME_LEN))
37bb04e5 2230 return 0;
08b37d51 2231 if ((vol->username && strlen(vol->username) != 0) &&
37bb04e5
PS		 2232 ses->password != NULL &&
2233 strncmp(ses->password,
2234 vol->password ? vol->password : "",
8c3a2b4c 2235 CIFS_MAX_PASSWORD_LEN))
37bb04e5
PS		 2236 return 0;
2237 }
2238 return 1;
2239}
2240
96daf2b0 2241static struct cifs_ses *
4ff67b72 2242cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1da177e4 2243{
96daf2b0 2244 struct cifs_ses *ses;
dea570e0 2245
3f9bcca7 2246 spin_lock(&cifs_tcp_ses_lock);
4ff67b72 2247 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
7f48558e
SP		 2248 if (ses->status == CifsExiting)
2249 continue;
37bb04e5
PS		 2250 if (!match_session(ses, vol))
2251 continue;
14fbf50d 2252 ++ses->ses_count;
3f9bcca7 2253 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2254 return ses;
2255 }
3f9bcca7 2256 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2257 return NULL;
2258}
dea570e0 2259
14fbf50d 2260static void
96daf2b0 2261cifs_put_smb_ses(struct cifs_ses *ses)
14fbf50d 2262{
7f48558e 2263 unsigned int rc, xid;
14fbf50d 2264 struct TCP_Server_Info *server = ses->server;
dea570e0 2265
f96637be 2266 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
7f48558e 2267
3f9bcca7 2268 spin_lock(&cifs_tcp_ses_lock);
7f48558e
SP		 2269 if (ses->status == CifsExiting) {
2270 spin_unlock(&cifs_tcp_ses_lock);
2271 return;
2272 }
14fbf50d 2273 if (--ses->ses_count > 0) {
3f9bcca7 2274 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2275 return;
2276 }
7f48558e
SP		 2277 if (ses->status == CifsGood)
2278 ses->status = CifsExiting;
3f9bcca7 2279 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2280
7f48558e 2281 if (ses->status == CifsExiting && server->ops->logoff) {
6d5786a3 2282 xid = get_xid();
7f48558e
SP		 2283 rc = server->ops->logoff(xid, ses);
2284 if (rc)
2285 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2286 __func__, rc);
6d5786a3 2287 _free_xid(xid);
14fbf50d 2288 }
7f48558e
SP		 2289
2290 spin_lock(&cifs_tcp_ses_lock);
2291 list_del_init(&ses->smb_ses_list);
2292 spin_unlock(&cifs_tcp_ses_lock);
2293
14fbf50d
JL		 2294 sesInfoFree(ses);
2295 cifs_put_tcp_session(server);
2296}
dea570e0 2297
8a8798a5
JL		 2298#ifdef CONFIG_KEYS
2299
057d6332
CG		 2300/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2301#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
8a8798a5
JL		 2302
2303/* Populate username and pw fields from keyring if possible */
2304static int
2305cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2306{
2307 int rc = 0;
2308 char *desc, *delim, *payload;
2309 ssize_t len;
2310 struct key *key;
2311 struct TCP_Server_Info *server = ses->server;
2312 struct sockaddr_in *sa;
2313 struct sockaddr_in6 *sa6;
2314 struct user_key_payload *upayload;
2315
2316 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2317 if (!desc)
2318 return -ENOMEM;
2319
2320 /* try to find an address key first */
2321 switch (server->dstaddr.ss_family) {
2322 case AF_INET:
2323 sa = (struct sockaddr_in *)&server->dstaddr;
2324 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2325 break;
2326 case AF_INET6:
2327 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2328 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2329 break;
2330 default:
f96637be
JP		 2331 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2332 server->dstaddr.ss_family);
8a8798a5
JL		 2333 rc = -EINVAL;
2334 goto out_err;
2335 }
2336
f96637be 2337 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2338 key = request_key(&key_type_logon, desc, "");
2339 if (IS_ERR(key)) {
2340 if (!ses->domainName) {
f96637be 2341 cifs_dbg(FYI, "domainName is NULL\n");
8a8798a5
JL		 2342 rc = PTR_ERR(key);
2343 goto out_err;
2344 }
2345
2346 /* didn't work, try to find a domain key */
2347 sprintf(desc, "cifs:d:%s", ses->domainName);
f96637be 2348 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2349 key = request_key(&key_type_logon, desc, "");
2350 if (IS_ERR(key)) {
2351 rc = PTR_ERR(key);
2352 goto out_err;
2353 }
2354 }
2355
2356 down_read(&key->sem);
2357 upayload = key->payload.data;
2358 if (IS_ERR_OR_NULL(upayload)) {
4edc53c1 2359 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
8a8798a5
JL		 2360 goto out_key_put;
2361 }
2362
2363 /* find first : in payload */
2364 payload = (char *)upayload->data;
2365 delim = strnchr(payload, upayload->datalen, ':');
f96637be 2366 cifs_dbg(FYI, "payload=%s\n", payload);
8a8798a5 2367 if (!delim) {
f96637be
JP		 2368 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2369 upayload->datalen);
8a8798a5
JL		 2370 rc = -EINVAL;
2371 goto out_key_put;
2372 }
2373
2374 len = delim - payload;
8c3a2b4c 2375 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
f96637be
JP		 2376 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2377 len);
8a8798a5
JL		 2378 rc = -EINVAL;
2379 goto out_key_put;
2380 }
2381
2382 vol->username = kstrndup(payload, len, GFP_KERNEL);
2383 if (!vol->username) {
f96637be
JP		 2384 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2385 len);
8a8798a5
JL		 2386 rc = -ENOMEM;
2387 goto out_key_put;
2388 }
f96637be 2389 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
8a8798a5
JL		 2390
2391 len = key->datalen - (len + 1);
8c3a2b4c 2392 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
f96637be 2393 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
8a8798a5
JL		 2394 rc = -EINVAL;
2395 kfree(vol->username);
2396 vol->username = NULL;
2397 goto out_key_put;
2398 }
2399
2400 ++delim;
2401 vol->password = kstrndup(delim, len, GFP_KERNEL);
2402 if (!vol->password) {
f96637be
JP		 2403 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2404 len);
8a8798a5
JL		 2405 rc = -ENOMEM;
2406 kfree(vol->username);
2407 vol->username = NULL;
2408 goto out_key_put;
2409 }
2410
2411out_key_put:
2412 up_read(&key->sem);
2413 key_put(key);
2414out_err:
2415 kfree(desc);
f96637be 2416 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
8a8798a5
JL		 2417 return rc;
2418}
2419#else /* ! CONFIG_KEYS */
2420static inline int
2421cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2422 struct cifs_ses *ses __attribute__((unused)))
2423{
2424 return -ENOSYS;
2425}
2426#endif /* CONFIG_KEYS */
2427
96daf2b0 2428static struct cifs_ses *
36988c76
JL		 2429cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2430{
286170aa
PS		 2431 int rc = -ENOMEM;
2432 unsigned int xid;
96daf2b0 2433 struct cifs_ses *ses;
a9f1b85e
PS		 2434 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2435 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
36988c76 2436
6d5786a3 2437 xid = get_xid();
36988c76 2438
4ff67b72 2439 ses = cifs_find_smb_ses(server, volume_info);
36988c76 2440 if (ses) {
f96637be
JP		 2441 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2442 ses->status);
36988c76 2443
36988c76 2444 mutex_lock(&ses->session_mutex);
198b5682
JL		 2445 rc = cifs_negotiate_protocol(xid, ses);
2446 if (rc) {
2447 mutex_unlock(&ses->session_mutex);
2448 /* problem -- put our ses reference */
2449 cifs_put_smb_ses(ses);
6d5786a3 2450 free_xid(xid);
198b5682
JL		 2451 return ERR_PTR(rc);
2452 }
36988c76 2453 if (ses->need_reconnect) {
f96637be 2454 cifs_dbg(FYI, "Session needs reconnect\n");
36988c76
JL		 2455 rc = cifs_setup_session(xid, ses,
2456 volume_info->local_nls);
2457 if (rc) {
2458 mutex_unlock(&ses->session_mutex);
2459 /* problem -- put our reference */
2460 cifs_put_smb_ses(ses);
6d5786a3 2461 free_xid(xid);
36988c76
JL		 2462 return ERR_PTR(rc);
2463 }
2464 }
2465 mutex_unlock(&ses->session_mutex);
460cf341
JL		 2466
2467 /* existing SMB ses has a server reference already */
2468 cifs_put_tcp_session(server);
6d5786a3 2469 free_xid(xid);
36988c76
JL		 2470 return ses;
2471 }
2472
f96637be 2473 cifs_dbg(FYI, "Existing smb sess not found\n");
36988c76
JL		 2474 ses = sesInfoAlloc();
2475 if (ses == NULL)
2476 goto get_ses_fail;
2477
2478 /* new SMB session uses our server ref */
2479 ses->server = server;
a9f1b85e
PS		 2480 if (server->dstaddr.ss_family == AF_INET6)
2481 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
36988c76 2482 else
a9f1b85e 2483 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
36988c76 2484
8727c8a8
SF		 2485 if (volume_info->username) {
2486 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2487 if (!ses->user_name)
2488 goto get_ses_fail;
2489 }
36988c76
JL		 2490
2491 /* volume_info->password freed at unmount */
2492 if (volume_info->password) {
2493 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2494 if (!ses->password)
2495 goto get_ses_fail;
2496 }
2497 if (volume_info->domainname) {
d3686d54
SP		 2498 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2499 if (!ses->domainName)
2500 goto get_ses_fail;
36988c76 2501 }
3e4b3e1f 2502 ses->cred_uid = volume_info->cred_uid;
36988c76 2503 ses->linux_uid = volume_info->linux_uid;
d9b94201 2504
28e11bd8
JL		 2505 ses->sectype = volume_info->sectype;
2506 ses->sign = volume_info->sign;
36988c76
JL		 2507
2508 mutex_lock(&ses->session_mutex);
198b5682
JL		 2509 rc = cifs_negotiate_protocol(xid, ses);
2510 if (!rc)
2511 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
36988c76 2512 mutex_unlock(&ses->session_mutex);
c8e56f1f 2513 if (rc)
36988c76
JL		 2514 goto get_ses_fail;
2515
2516 /* success, put it on the list */
3f9bcca7 2517 spin_lock(&cifs_tcp_ses_lock);
36988c76 2518 list_add(&ses->smb_ses_list, &server->smb_ses_list);
3f9bcca7 2519 spin_unlock(&cifs_tcp_ses_lock);
36988c76 2520
6d5786a3 2521 free_xid(xid);
36988c76
JL		 2522 return ses;
2523
2524get_ses_fail:
2525 sesInfoFree(ses);
6d5786a3 2526 free_xid(xid);
36988c76
JL		 2527 return ERR_PTR(rc);
2528}
2529
96daf2b0 2530static int match_tcon(struct cifs_tcon *tcon, const char *unc)
37bb04e5
PS		 2531{
2532 if (tcon->tidStatus == CifsExiting)
2533 return 0;
2534 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2535 return 0;
2536 return 1;
2537}
2538
96daf2b0
SF		 2539static struct cifs_tcon *
2540cifs_find_tcon(struct cifs_ses *ses, const char *unc)
f1987b44
JL		 2541{
2542 struct list_head *tmp;
96daf2b0 2543 struct cifs_tcon *tcon;
f1987b44 2544
3f9bcca7 2545 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2546 list_for_each(tmp, &ses->tcon_list) {
96daf2b0 2547 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
37bb04e5 2548 if (!match_tcon(tcon, unc))
f1987b44 2549 continue;
f1987b44 2550 ++tcon->tc_count;
3f9bcca7 2551 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2552 return tcon;
1da177e4 2553 }
3f9bcca7 2554 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2555 return NULL;
2556}
2557
f1987b44 2558static void
96daf2b0 2559cifs_put_tcon(struct cifs_tcon *tcon)
f1987b44 2560{
2e6e02ab 2561 unsigned int xid;
96daf2b0 2562 struct cifs_ses *ses = tcon->ses;
f1987b44 2563
f96637be 2564 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3f9bcca7 2565 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2566 if (--tcon->tc_count > 0) {
3f9bcca7 2567 spin_unlock(&cifs_tcp_ses_lock);
f1987b44
JL		 2568 return;
2569 }
2570
2571 list_del_init(&tcon->tcon_list);
3f9bcca7 2572 spin_unlock(&cifs_tcp_ses_lock);
f1987b44 2573
6d5786a3 2574 xid = get_xid();
2e6e02ab
PS		 2575 if (ses->server->ops->tree_disconnect)
2576 ses->server->ops->tree_disconnect(xid, tcon);
6d5786a3 2577 _free_xid(xid);
f1987b44 2578
d03382ce 2579 cifs_fscache_release_super_cookie(tcon);
9f841593 2580 tconInfoFree(tcon);
f1987b44
JL		 2581 cifs_put_smb_ses(ses);
2582}
2583
96daf2b0
SF		 2584static struct cifs_tcon *
2585cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
d00c28de
JL		 2586{
2587 int rc, xid;
96daf2b0 2588 struct cifs_tcon *tcon;
d00c28de
JL		 2589
2590 tcon = cifs_find_tcon(ses, volume_info->UNC);
2591 if (tcon) {
f96637be 2592 cifs_dbg(FYI, "Found match on UNC path\n");
d00c28de
JL		 2593 /* existing tcon already has a reference */
2594 cifs_put_smb_ses(ses);
2595 if (tcon->seal != volume_info->seal)
f96637be 2596 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
d00c28de
JL		 2597 return tcon;
2598 }
2599
2e6e02ab
PS		 2600 if (!ses->server->ops->tree_connect) {
2601 rc = -ENOSYS;
2602 goto out_fail;
2603 }
2604
d00c28de
JL		 2605 tcon = tconInfoAlloc();
2606 if (tcon == NULL) {
2607 rc = -ENOMEM;
2608 goto out_fail;
2609 }
2610
2611 tcon->ses = ses;
2612 if (volume_info->password) {
2613 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2614 if (!tcon->password) {
2615 rc = -ENOMEM;
2616 goto out_fail;
2617 }
2618 }
2619
2e6e02ab
PS		 2620 /*
2621 * BB Do we need to wrap session_mutex around this TCon call and Unix
2622 * SetFS as we do on SessSetup and reconnect?
2623 */
6d5786a3 2624 xid = get_xid();
2e6e02ab
PS		 2625 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2626 volume_info->local_nls);
6d5786a3 2627 free_xid(xid);
f96637be 2628 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
d00c28de
JL		 2629 if (rc)
2630 goto out_fail;
2631
2632 if (volume_info->nodfs) {
2633 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
f96637be 2634 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
d00c28de
JL		 2635 }
2636 tcon->seal = volume_info->seal;
2e6e02ab
PS		 2637 /*
2638 * We can have only one retry value for a connection to a share so for
2639 * resources mounted more than once to the same server share the last
2640 * value passed in for the retry flag is used.
2641 */
d00c28de
JL		 2642 tcon->retry = volume_info->retry;
2643 tcon->nocase = volume_info->nocase;
2644 tcon->local_lease = volume_info->local_lease;
233839b1 2645 INIT_LIST_HEAD(&tcon->pending_opens);
d00c28de 2646
3f9bcca7 2647 spin_lock(&cifs_tcp_ses_lock);
d00c28de 2648 list_add(&tcon->tcon_list, &ses->tcon_list);
3f9bcca7 2649 spin_unlock(&cifs_tcp_ses_lock);
d00c28de 2650
d03382ce
SJ		 2651 cifs_fscache_get_super_cookie(tcon);
2652
d00c28de
JL		 2653 return tcon;
2654
2655out_fail:
2656 tconInfoFree(tcon);
2657 return ERR_PTR(rc);
2658}
2659
9d002df4
JL		 2660void
2661cifs_put_tlink(struct tcon_link *tlink)
2662{
2663 if (!tlink || IS_ERR(tlink))
2664 return;
2665
2666 if (!atomic_dec_and_test(&tlink->tl_count) ||
2667 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2668 tlink->tl_time = jiffies;
2669 return;
2670 }
2671
2672 if (!IS_ERR(tlink_tcon(tlink)))
2673 cifs_put_tcon(tlink_tcon(tlink));
2674 kfree(tlink);
2675 return;
2676}
d00c28de 2677
25c7f41e 2678static inline struct tcon_link *
cd51875d
PS		 2679cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2680{
2681 return cifs_sb->master_tlink;
2682}
25c7f41e
PS		 2683
2684static int
2685compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2686{
2687 struct cifs_sb_info *old = CIFS_SB(sb);
2688 struct cifs_sb_info *new = mnt_data->cifs_sb;
2689
2690 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2691 return 0;
2692
2693 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2694 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2695 return 0;
2696
25c7f41e 2697 /*
5eba8ab3
JL		 2698 * We want to share sb only if we don't specify an r/wsize or
2699 * specified r/wsize is greater than or equal to existing one.
25c7f41e
PS		 2700 */
2701 if (new->wsize && new->wsize < old->wsize)
2702 return 0;
2703
5eba8ab3
JL		 2704 if (new->rsize && new->rsize < old->rsize)
2705 return 0;
2706
1f68233c 2707 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
25c7f41e
PS		 2708 return 0;
2709
2710 if (old->mnt_file_mode != new->mnt_file_mode ||
2711 old->mnt_dir_mode != new->mnt_dir_mode)
2712 return 0;
2713
2714 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2715 return 0;
2716
2717 if (old->actimeo != new->actimeo)
2718 return 0;
2719
2720 return 1;
2721}
2722
2723int
2724cifs_match_super(struct super_block *sb, void *data)
2725{
2726 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2727 struct smb_vol *volume_info;
2728 struct cifs_sb_info *cifs_sb;
2729 struct TCP_Server_Info *tcp_srv;
96daf2b0
SF		 2730 struct cifs_ses *ses;
2731 struct cifs_tcon *tcon;
25c7f41e 2732 struct tcon_link *tlink;
25c7f41e
PS		 2733 int rc = 0;
2734
25c7f41e
PS		 2735 spin_lock(&cifs_tcp_ses_lock);
2736 cifs_sb = CIFS_SB(sb);
2737 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2738 if (IS_ERR(tlink)) {
2739 spin_unlock(&cifs_tcp_ses_lock);
2740 return rc;
2741 }
2742 tcon = tlink_tcon(tlink);
2743 ses = tcon->ses;
2744 tcp_srv = ses->server;
2745
2746 volume_info = mnt_data->vol;
2747
9fa114f7 2748 if (!match_server(tcp_srv, volume_info) ||
25c7f41e
PS		 2749 !match_session(ses, volume_info) ||
2750 !match_tcon(tcon, volume_info->UNC)) {
2751 rc = 0;
2752 goto out;
2753 }
2754
2755 rc = compare_mount_options(sb, mnt_data);
2756out:
25c7f41e 2757 spin_unlock(&cifs_tcp_ses_lock);
f484b5d0 2758 cifs_put_tlink(tlink);
25c7f41e
PS		 2759 return rc;
2760}
2761
1da177e4 2762int
b669f33c 2763get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2e6e02ab
PS		 2764 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2765 struct dfs_info3_param **referrals, int remap)
1da177e4
LT		 2766{
2767 char *temp_unc;
2768 int rc = 0;
2769
b669f33c 2770 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2e6e02ab
PS		 2771 return -ENOSYS;
2772
2773 *num_referrals = 0;
2774 *referrals = NULL;
1da177e4 2775
2e6e02ab 2776 if (ses->ipc_tid == 0) {
1da177e4 2777 temp_unc = kmalloc(2 /* for slashes */ +
2e6e02ab
PS		 2778 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2779 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
1da177e4
LT		 2780 if (temp_unc == NULL)
2781 return -ENOMEM;
2782 temp_unc[0] = '\\';
2783 temp_unc[1] = '\\';
2e6e02ab
PS		 2784 strcpy(temp_unc + 2, ses->serverName);
2785 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2786 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2787 nls_codepage);
f96637be 2788 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
1da177e4
LT		 2789 kfree(temp_unc);
2790 }
2791 if (rc == 0)
b669f33c
PS		 2792 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2793 referrals, num_referrals,
2794 nls_codepage, remap);
2e6e02ab
PS		 2795 /*
2796 * BB - map targetUNCs to dfs_info3 structures, here or in
b669f33c 2797 * ses->server->ops->get_dfs_refer.
2e6e02ab 2798 */
1da177e4
LT		 2799
2800 return rc;
2801}
2802
09e50d55
JL		 2803#ifdef CONFIG_DEBUG_LOCK_ALLOC
2804static struct lock_class_key cifs_key[2];
2805static struct lock_class_key cifs_slock_key[2];
2806
2807static inline void
2808cifs_reclassify_socket4(struct socket *sock)
2809{
2810 struct sock *sk = sock->sk;
2811 BUG_ON(sock_owned_by_user(sk));
2812 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2813 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2814}
2815
2816static inline void
2817cifs_reclassify_socket6(struct socket *sock)
2818{
2819 struct sock *sk = sock->sk;
2820 BUG_ON(sock_owned_by_user(sk));
2821 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2822 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2823}
2824#else
2825static inline void
2826cifs_reclassify_socket4(struct socket *sock)
2827{
2828}
2829
2830static inline void
2831cifs_reclassify_socket6(struct socket *sock)
2832{
2833}
2834#endif
2835
1da177e4 2836/* See RFC1001 section 14 on representation of Netbios names */
50c2f753 2837static void rfc1002mangle(char *target, char *source, unsigned int length)
1da177e4 2838{
50c2f753 2839 unsigned int i, j;
1da177e4 2840
50c2f753 2841 for (i = 0, j = 0; i < (length); i++) {
1da177e4
LT		 2842 /* mask a nibble at a time and encode */
2843 target[j] = 'A' + (0x0F & (source[i] >> 4));
2844 target[j+1] = 'A' + (0x0F & source[i]);
50c2f753 2845 j += 2;
1da177e4
LT		 2846 }
2847
2848}
2849
3eb9a889
BG		 2850static int
2851bind_socket(struct TCP_Server_Info *server)
2852{
2853 int rc = 0;
2854 if (server->srcaddr.ss_family != AF_UNSPEC) {
2855 /* Bind to the specified local IP address */
2856 struct socket *socket = server->ssocket;
2857 rc = socket->ops->bind(socket,
2858 (struct sockaddr *) &server->srcaddr,
2859 sizeof(server->srcaddr));
2860 if (rc < 0) {
2861 struct sockaddr_in *saddr4;
2862 struct sockaddr_in6 *saddr6;
2863 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2864 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2865 if (saddr6->sin6_family == AF_INET6)
f96637be
JP		 2866 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2867 &saddr6->sin6_addr, rc);
3eb9a889 2868 else
f96637be
JP		 2869 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2870 &saddr4->sin_addr.s_addr, rc);
3eb9a889
BG		 2871 }
2872 }
2873 return rc;
2874}
1da177e4
LT		 2875
2876static int
a9f1b85e 2877ip_rfc1001_connect(struct TCP_Server_Info *server)
1da177e4
LT		 2878{
2879 int rc = 0;
a9f1b85e
PS		 2880 /*
2881 * some servers require RFC1001 sessinit before sending
2882 * negprot - BB check reconnection in case where second
2883 * sessinit is sent but no second negprot
2884 */
2885 struct rfc1002_session_packet *ses_init_buf;
2886 struct smb_hdr *smb_buf;
2887 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2888 GFP_KERNEL);
2889 if (ses_init_buf) {
2890 ses_init_buf->trailer.session_req.called_len = 32;
2891
2892 if (server->server_RFC1001_name &&
2893 server->server_RFC1001_name[0] != 0)
2894 rfc1002mangle(ses_init_buf->trailer.
2895 session_req.called_name,
2896 server->server_RFC1001_name,
2897 RFC1001_NAME_LEN_WITH_NULL);
2898 else
2899 rfc1002mangle(ses_init_buf->trailer.
2900 session_req.called_name,
2901 DEFAULT_CIFS_CALLED_NAME,
2902 RFC1001_NAME_LEN_WITH_NULL);
2903
2904 ses_init_buf->trailer.session_req.calling_len = 32;
2905
2906 /*
2907 * calling name ends in null (byte 16) from old smb
2908 * convention.
2909 */
2910 if (server->workstation_RFC1001_name &&
2911 server->workstation_RFC1001_name[0] != 0)
2912 rfc1002mangle(ses_init_buf->trailer.
2913 session_req.calling_name,
2914 server->workstation_RFC1001_name,
2915 RFC1001_NAME_LEN_WITH_NULL);
2916 else
2917 rfc1002mangle(ses_init_buf->trailer.
2918 session_req.calling_name,
2919 "LINUX_CIFS_CLNT",
2920 RFC1001_NAME_LEN_WITH_NULL);
2921
2922 ses_init_buf->trailer.session_req.scope1 = 0;
2923 ses_init_buf->trailer.session_req.scope2 = 0;
2924 smb_buf = (struct smb_hdr *)ses_init_buf;
2925
2926 /* sizeof RFC1002_SESSION_REQUEST with no scope */
be8e3b00 2927 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
a9f1b85e
PS		 2928 rc = smb_send(server, smb_buf, 0x44);
2929 kfree(ses_init_buf);
2930 /*
2931 * RFC1001 layer in at least one server
2932 * requires very short break before negprot
2933 * presumably because not expecting negprot
2934 * to follow so fast. This is a simple
2935 * solution that works without
2936 * complicating the code and causes no
2937 * significant slowing down on mount
2938 * for everyone else
2939 */
2940 usleep_range(1000, 2000);
2941 }
2942 /*
2943 * else the negprot may still work without this
2944 * even though malloc failed
2945 */
2946
2947 return rc;
2948}
2949
2950static int
2951generic_ip_connect(struct TCP_Server_Info *server)
2952{
2953 int rc = 0;
6da97910 2954 __be16 sport;
a9f1b85e 2955 int slen, sfamily;
bcf4b106 2956 struct socket *socket = server->ssocket;
a9f1b85e
PS		 2957 struct sockaddr *saddr;
2958
2959 saddr = (struct sockaddr *) &server->dstaddr;
2960
2961 if (server->dstaddr.ss_family == AF_INET6) {
2962 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2963 slen = sizeof(struct sockaddr_in6);
2964 sfamily = AF_INET6;
2965 } else {
2966 sport = ((struct sockaddr_in *) saddr)->sin_port;
2967 slen = sizeof(struct sockaddr_in);
2968 sfamily = AF_INET;
2969 }
1da177e4 2970
bcf4b106 2971 if (socket == NULL) {
f1d0c998
RL		 2972 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2973 IPPROTO_TCP, &socket, 1);
1da177e4 2974 if (rc < 0) {
f96637be 2975 cifs_dbg(VFS, "Error %d creating socket\n", rc);
a9f1b85e 2976 server->ssocket = NULL;
1da177e4 2977 return rc;
1da177e4 2978 }
bcf4b106
JL		 2979
2980 /* BB other socket options to set KEEPALIVE, NODELAY? */
f96637be 2981 cifs_dbg(FYI, "Socket created\n");
bcf4b106
JL		 2982 server->ssocket = socket;
2983 socket->sk->sk_allocation = GFP_NOFS;
a9f1b85e
PS		 2984 if (sfamily == AF_INET6)
2985 cifs_reclassify_socket6(socket);
2986 else
2987 cifs_reclassify_socket4(socket);
1da177e4
LT		 2988 }
2989
3eb9a889
BG		 2990 rc = bind_socket(server);
2991 if (rc < 0)
2992 return rc;
2993
bcf4b106
JL		 2994 /*
2995 * Eventually check for other socket options to change from
a9f1b85e
PS		 2996 * the default. sock_setsockopt not used because it expects
2997 * user space buffer
bcf4b106
JL		 2998 */
2999 socket->sk->sk_rcvtimeo = 7 * HZ;
da505c38 3000 socket->sk->sk_sndtimeo = 5 * HZ;
edf1ae40 3001
b387eaeb 3002 /* make the bufsizes depend on wsize/rsize and max requests */
bcf4b106
JL		 3003 if (server->noautotune) {
3004 if (socket->sk->sk_sndbuf < (200 * 1024))
3005 socket->sk->sk_sndbuf = 200 * 1024;
3006 if (socket->sk->sk_rcvbuf < (140 * 1024))
3007 socket->sk->sk_rcvbuf = 140 * 1024;
edf1ae40 3008 }
1da177e4 3009
6a5fa236 3010 if (server->tcp_nodelay) {
a9f1b85e 3011 int val = 1;
6a5fa236
SF		 3012 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3013 (char *)&val, sizeof(val));
3014 if (rc)
f96637be
JP		 3015 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3016 rc);
6a5fa236
SF		 3017 }
3018
f96637be 3019 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
bcf4b106 3020 socket->sk->sk_sndbuf,
b6b38f70 3021 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
bcf4b106 3022
ee1b3ea9
JL		 3023 rc = socket->ops->connect(socket, saddr, slen, 0);
3024 if (rc < 0) {
f96637be 3025 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
ee1b3ea9
JL		 3026 sock_release(socket);
3027 server->ssocket = NULL;
3028 return rc;
3029 }
3030
a9f1b85e
PS		 3031 if (sport == htons(RFC1001_PORT))
3032 rc = ip_rfc1001_connect(server);
50c2f753 3033
1da177e4
LT		 3034 return rc;
3035}
3036
3037static int
a9f1b85e 3038ip_connect(struct TCP_Server_Info *server)
1da177e4 3039{
6da97910 3040 __be16 *sport;
a9f1b85e
PS		 3041 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3042 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1da177e4 3043
a9f1b85e
PS		 3044 if (server->dstaddr.ss_family == AF_INET6)
3045 sport = &addr6->sin6_port;
3046 else
3047 sport = &addr->sin_port;
1da177e4 3048
a9f1b85e
PS		 3049 if (*sport == 0) {
3050 int rc;
1da177e4 3051
a9f1b85e
PS		 3052 /* try with 445 port at first */
3053 *sport = htons(CIFS_PORT);
3eb9a889 3054
a9f1b85e 3055 rc = generic_ip_connect(server);
1da177e4 3056 if (rc >= 0)
a9f1b85e 3057 return rc;
6a5fa236 3058
a9f1b85e
PS		 3059 /* if it failed, try with 139 port */
3060 *sport = htons(RFC1001_PORT);
6a5fa236
SF		 3061 }
3062
a9f1b85e 3063 return generic_ip_connect(server);
1da177e4
LT		 3064}
3065
6d5786a3 3066void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
2c6292ae 3067 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
8af18971
SF		 3068{
3069 /* if we are reconnecting then should we check to see if
3070 * any requested capabilities changed locally e.g. via
3071 * remount but we can not do much about it here
3072 * if they have (even if we could detect it by the following)
3073 * Perhaps we could add a backpointer to array of sb from tcon
3074 * or if we change to make all sb to same share the same
3075 * sb as NFS - then we only have one backpointer to sb.
3076 * What if we wanted to mount the server share twice once with
3077 * and once without posixacls or posix paths? */
3078 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
50c2f753 3079
c18c842b
SF		 3080 if (vol_info && vol_info->no_linux_ext) {
3081 tcon->fsUnixInfo.Capability = 0;
3082 tcon->unix_ext = 0; /* Unix Extensions disabled */
f96637be 3083 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
c18c842b
SF		 3084 return;
3085 } else if (vol_info)
3086 tcon->unix_ext = 1; /* Unix Extensions supported */
3087
3088 if (tcon->unix_ext == 0) {
f96637be 3089 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
c18c842b
SF		 3090 return;
3091 }
50c2f753 3092
fb8c4b14 3093 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
8af18971 3094 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
f96637be 3095 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
8af18971
SF		 3096 /* check for reconnect case in which we do not
3097 want to change the mount behavior if we can avoid it */
fb8c4b14 3098 if (vol_info == NULL) {
50c2f753 3099 /* turn off POSIX ACL and PATHNAMES if not set
8af18971
SF		 3100 originally at mount time */
3101 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3102 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
11b6d645
IM		 3103 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3104 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3105 cifs_dbg(VFS, "POSIXPATH support change\n");
8af18971 3106 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
11b6d645 3107 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
f96637be
JP		 3108 cifs_dbg(VFS, "possible reconnect error\n");
3109 cifs_dbg(VFS, "server disabled POSIX path support\n");
11b6d645 3110 }
8af18971 3111 }
50c2f753 3112
6848b733 3113 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3114 cifs_dbg(VFS, "per-share encryption not supported yet\n");
6848b733 3115
8af18971 3116 cap &= CIFS_UNIX_CAP_MASK;
75865f8c 3117 if (vol_info && vol_info->no_psx_acl)
8af18971 3118 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
75865f8c 3119 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
f96637be 3120 cifs_dbg(FYI, "negotiated posix acl support\n");
2c6292ae
AV		 3121 if (cifs_sb)
3122 cifs_sb->mnt_cifs_flags |=
3123 CIFS_MOUNT_POSIXACL;
8af18971
SF		 3124 }
3125
75865f8c 3126 if (vol_info && vol_info->posix_paths == 0)
8af18971 3127 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
75865f8c 3128 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
f96637be 3129 cifs_dbg(FYI, "negotiate posix pathnames\n");
2c6292ae
AV		 3130 if (cifs_sb)
3131 cifs_sb->mnt_cifs_flags |=
8af18971
SF		 3132 CIFS_MOUNT_POSIX_PATHS;
3133 }
50c2f753 3134
f96637be 3135 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
8af18971 3136#ifdef CONFIG_CIFS_DEBUG2
75865f8c 3137 if (cap & CIFS_UNIX_FCNTL_CAP)
f96637be 3138 cifs_dbg(FYI, "FCNTL cap\n");
75865f8c 3139 if (cap & CIFS_UNIX_EXTATTR_CAP)
f96637be 3140 cifs_dbg(FYI, "EXTATTR cap\n");
75865f8c 3141 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3142 cifs_dbg(FYI, "POSIX path cap\n");
75865f8c 3143 if (cap & CIFS_UNIX_XATTR_CAP)
f96637be 3144 cifs_dbg(FYI, "XATTR cap\n");
75865f8c 3145 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
f96637be 3146 cifs_dbg(FYI, "POSIX ACL cap\n");
75865f8c 3147 if (cap & CIFS_UNIX_LARGE_READ_CAP)
f96637be 3148 cifs_dbg(FYI, "very large read cap\n");
75865f8c 3149 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
f96637be 3150 cifs_dbg(FYI, "very large write cap\n");
6848b733 3151 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
f96637be 3152 cifs_dbg(FYI, "transport encryption cap\n");
6848b733 3153 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3154 cifs_dbg(FYI, "mandatory transport encryption cap\n");
8af18971
SF		 3155#endif /* CIFS_DEBUG2 */
3156 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
442aa310 3157 if (vol_info == NULL) {
f96637be 3158 cifs_dbg(FYI, "resetting capabilities failed\n");
442aa310 3159 } else
f96637be 3160 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");
5a44b319 3161
8af18971
SF		 3162 }
3163 }
3164}
3165
724d9f1c
PS		 3166void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3167 struct cifs_sb_info *cifs_sb)
b1c8d2b4 3168{
2de970ff
JL		 3169 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3170
2ced6f69
AV		 3171 spin_lock_init(&cifs_sb->tlink_tree_lock);
3172 cifs_sb->tlink_tree = RB_ROOT;
3173
25c7f41e 3174 /*
5eba8ab3
JL		 3175 * Temporarily set r/wsize for matching superblock. If we end up using
3176 * new sb then client will later negotiate it downward if needed.
25c7f41e 3177 */
5eba8ab3 3178 cifs_sb->rsize = pvolume_info->rsize;
25c7f41e
PS		 3179 cifs_sb->wsize = pvolume_info->wsize;
3180
3b795210
SF		 3181 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3182 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3183 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3184 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
f96637be
JP		 3185 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3186 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3b795210 3187
6d20e840 3188 cifs_sb->actimeo = pvolume_info->actimeo;
724d9f1c 3189 cifs_sb->local_nls = pvolume_info->local_nls;
6d20e840 3190
3b795210
SF		 3191 if (pvolume_info->noperm)
3192 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3193 if (pvolume_info->setuids)
3194 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3195 if (pvolume_info->server_ino)
3196 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3197 if (pvolume_info->remap)
3198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3199 if (pvolume_info->no_xattr)
3200 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3201 if (pvolume_info->sfu_emul)
3202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3203 if (pvolume_info->nobrl)
3204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
be652445 3205 if (pvolume_info->nostrictsync)
4717bed6 3206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
13a6e42a
SF		 3207 if (pvolume_info->mand_lock)
3208 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
d4ffff1f
PS		 3209 if (pvolume_info->rwpidforward)
3210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3b795210
SF		 3211 if (pvolume_info->cifs_acl)
3212 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3c7c87fd 3213 if (pvolume_info->backupuid_specified) {
3d3ea8e6 3214 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3c7c87fd
SP		 3215 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3216 }
3217 if (pvolume_info->backupgid_specified) {
3d3ea8e6 3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3c7c87fd
SP		 3219 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3220 }
3b795210
SF		 3221 if (pvolume_info->override_uid)
3222 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3223 if (pvolume_info->override_gid)
3224 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3225 if (pvolume_info->dynperm)
3226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
fa1df75d
SJ		 3227 if (pvolume_info->fsc)
3228 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
0eb8a132
JL		 3229 if (pvolume_info->multiuser)
3230 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3231 CIFS_MOUNT_NO_PERM);
d39454ff
PS		 3232 if (pvolume_info->strict_io)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3b795210 3234 if (pvolume_info->direct_io) {
f96637be 3235 cifs_dbg(FYI, "mounting share using direct i/o\n");
3b795210
SF		 3236 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3237 }
736a3320
SM		 3238 if (pvolume_info->mfsymlinks) {
3239 if (pvolume_info->sfu_emul) {
f96637be 3240 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
736a3320
SM		 3241 } else {
3242 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3243 }
3244 }
3b795210
SF		 3245
3246 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
f96637be 3247 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
b1c8d2b4
JL		 3248}
3249
b9bce2e9
JL		 3250static void
3251cleanup_volume_info_contents(struct smb_vol *volume_info)
1bfe73c2 3252{
b946845a 3253 kfree(volume_info->username);
1bfe73c2 3254 kzfree(volume_info->password);
95c75454 3255 kfree(volume_info->UNC);
b946845a
SF		 3256 kfree(volume_info->domainname);
3257 kfree(volume_info->iocharset);
1bfe73c2 3258 kfree(volume_info->prepath);
b9bce2e9
JL		 3259}
3260
3261void
3262cifs_cleanup_volume_info(struct smb_vol *volume_info)
3263{
3264 if (!volume_info)
3265 return;
3266 cleanup_volume_info_contents(volume_info);
1bfe73c2 3267 kfree(volume_info);
1bfe73c2
IM		 3268}
3269
b9bce2e9 3270
2d6d589d 3271#ifdef CONFIG_CIFS_DFS_UPCALL
6d3ea7e4
SF		 3272/*
3273 * cifs_build_path_to_root returns full path to root when we do not have an
3274 * exiting connection (tcon)
3275 */
1bfe73c2 3276static char *
b2a0fa15 3277build_unc_path_to_root(const struct smb_vol *vol,
1bfe73c2
IM		 3278 const struct cifs_sb_info *cifs_sb)
3279{
b2a0fa15 3280 char *full_path, *pos;
839db3d1 3281 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
b2a0fa15 3282 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
1bfe73c2 3283
b2a0fa15 3284 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
1bfe73c2
IM		 3285 if (full_path == NULL)
3286 return ERR_PTR(-ENOMEM);
3287
b2a0fa15
JL		 3288 strncpy(full_path, vol->UNC, unc_len);
3289 pos = full_path + unc_len;
3290
3291 if (pplen) {
1fc29bac
JL		 3292 *pos = CIFS_DIR_SEP(cifs_sb);
3293 strncpy(pos + 1, vol->prepath, pplen);
b2a0fa15
JL		 3294 pos += pplen;
3295 }
3296
3297 *pos = '\0'; /* add trailing null */
f87d39d9 3298 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
f96637be 3299 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
1bfe73c2
IM		 3300 return full_path;
3301}
dd613945
SF		 3302
3303/*
3304 * Perform a dfs referral query for a share and (optionally) prefix
3305 *
046462ab
SF		 3306 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3307 * to a string containing updated options for the submount. Otherwise it
3308 * will be left untouched.
dd613945
SF		 3309 *
3310 * Returns the rc from get_dfs_path to the caller, which can be used to
3311 * determine whether there were referrals.
3312 */
3313static int
b669f33c 3314expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
dd613945 3315 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
046462ab 3316 int check_prefix)
dd613945
SF		 3317{
3318 int rc;
3319 unsigned int num_referrals = 0;
3320 struct dfs_info3_param *referrals = NULL;
3321 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3322
3323 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3324 if (IS_ERR(full_path))
3325 return PTR_ERR(full_path);
3326
3327 /* For DFS paths, skip the first '\' of the UNC */
3328 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3329
b669f33c 3330 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
dd613945
SF		 3331 &num_referrals, &referrals,
3332 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3333
3334 if (!rc && num_referrals > 0) {
3335 char *fake_devname = NULL;
3336
3337 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3338 full_path + 1, referrals,
3339 &fake_devname);
3340
3341 free_dfs_info_array(referrals, num_referrals);
046462ab 3342
dd613945
SF		 3343 if (IS_ERR(mdata)) {
3344 rc = PTR_ERR(mdata);
3345 mdata = NULL;
b9bce2e9
JL		 3346 } else {
3347 cleanup_volume_info_contents(volume_info);
b9bce2e9
JL		 3348 rc = cifs_setup_volume_info(volume_info, mdata,
3349 fake_devname);
dd613945 3350 }
b9bce2e9
JL		 3351 kfree(fake_devname);
3352 kfree(cifs_sb->mountdata);
046462ab 3353 cifs_sb->mountdata = mdata;
dd613945
SF		 3354 }
3355 kfree(full_path);
3356 return rc;
3357}
2d6d589d 3358#endif
1bfe73c2 3359
04db79b0
JL		 3360static int
3361cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3362 const char *devname)
1da177e4 3363{
724d9f1c 3364 int rc = 0;
1da177e4 3365
04db79b0
JL		 3366 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3367 return -EINVAL;
1da177e4 3368
7586b765 3369 if (volume_info->nullauth) {
f96637be 3370 cifs_dbg(FYI, "Anonymous login\n");
04febabc
JL		 3371 kfree(volume_info->username);
3372 volume_info->username = NULL;
7586b765 3373 } else if (volume_info->username) {
1da177e4 3374 /* BB fixme parse for domain name here */
f96637be 3375 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
1da177e4 3376 } else {
f96637be 3377 cifs_dbg(VFS, "No username specified\n");
50c2f753
SF		 3378 /* In userspace mount helper we can get user name from alternate
3379 locations such as env variables and files on disk */
04db79b0 3380 return -EINVAL;
1da177e4
LT		 3381 }
3382
1da177e4 3383 /* this is needed for ASCII cp to Unicode converts */
7586b765 3384 if (volume_info->iocharset == NULL) {
a5fc4ce0
JL		 3385 /* load_nls_default cannot return null */
3386 volume_info->local_nls = load_nls_default();
1da177e4 3387 } else {
a5fc4ce0
JL		 3388 volume_info->local_nls = load_nls(volume_info->iocharset);
3389 if (volume_info->local_nls == NULL) {
f96637be 3390 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
b6b38f70 3391 volume_info->iocharset);
04db79b0 3392 return -ELIBACC;
1da177e4
LT		 3393 }
3394 }
724d9f1c 3395
724d9f1c
PS		 3396 return rc;
3397}
3398
04db79b0
JL		 3399struct smb_vol *
3400cifs_get_volume_info(char *mount_data, const char *devname)
3401{
3402 int rc;
3403 struct smb_vol *volume_info;
3404
6ee9542a 3405 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
04db79b0
JL		 3406 if (!volume_info)
3407 return ERR_PTR(-ENOMEM);
3408
3409 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3410 if (rc) {
3411 cifs_cleanup_volume_info(volume_info);
3412 volume_info = ERR_PTR(rc);
3413 }
3414
3415 return volume_info;
3416}
3417
724d9f1c 3418int
2c6292ae 3419cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
724d9f1c 3420{
1daaae8f 3421 int rc;
6d5786a3 3422 unsigned int xid;
af4281dc 3423 struct cifs_ses *ses;
96daf2b0 3424 struct cifs_tcon *tcon;
af4281dc 3425 struct TCP_Server_Info *server;
724d9f1c
PS		 3426 char *full_path;
3427 struct tcon_link *tlink;
3428#ifdef CONFIG_CIFS_DFS_UPCALL
3429 int referral_walks_count = 0;
20547490 3430#endif
dd854466
AV		 3431
3432 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3433 if (rc)
3434 return rc;
3435
20547490 3436#ifdef CONFIG_CIFS_DFS_UPCALL
724d9f1c
PS		 3437try_mount_again:
3438 /* cleanup activities if we're chasing a referral */
3439 if (referral_walks_count) {
3440 if (tcon)
3441 cifs_put_tcon(tcon);
af4281dc
PS		 3442 else if (ses)
3443 cifs_put_smb_ses(ses);
724d9f1c 3444
6d5786a3 3445 free_xid(xid);
724d9f1c
PS		 3446 }
3447#endif
1daaae8f 3448 rc = 0;
724d9f1c 3449 tcon = NULL;
af4281dc
PS		 3450 ses = NULL;
3451 server = NULL;
724d9f1c
PS		 3452 full_path = NULL;
3453 tlink = NULL;
3454
6d5786a3 3455 xid = get_xid();
1da177e4 3456
63c038c2 3457 /* get a reference to a tcp session */
af4281dc
PS		 3458 server = cifs_get_tcp_session(volume_info);
3459 if (IS_ERR(server)) {
3460 rc = PTR_ERR(server);
dd854466 3461 bdi_destroy(&cifs_sb->bdi);
63c038c2 3462 goto out;
1da177e4
LT		 3463 }
3464
36988c76 3465 /* get a reference to a SMB session */
af4281dc
PS		 3466 ses = cifs_get_smb_ses(server, volume_info);
3467 if (IS_ERR(ses)) {
3468 rc = PTR_ERR(ses);
3469 ses = NULL;
36988c76 3470 goto mount_fail_check;
1da177e4 3471 }
50c2f753 3472
d00c28de 3473 /* search for existing tcon to this server share */
af4281dc 3474 tcon = cifs_get_tcon(ses, volume_info);
d00c28de
JL		 3475 if (IS_ERR(tcon)) {
3476 rc = PTR_ERR(tcon);
3477 tcon = NULL;
1bfe73c2 3478 goto remote_path_check;
d00c28de 3479 }
1bfe73c2 3480
d82c2df5 3481 /* tell server which Unix caps we support */
29e20f9c 3482 if (cap_unix(tcon->ses)) {
d82c2df5
SF		 3483 /* reset of caps checks mount to see if unix extensions
3484 disabled for just this mount */
2c6292ae 3485 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
6848b733
SF		 3486 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3487 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3488 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3489 rc = -EACCES;
3490 goto mount_fail_check;
3491 }
3492 } else
d82c2df5 3493 tcon->unix_ext = 0; /* server does not support them */
c18c842b 3494
af4281dc
PS		 3495 /* do not care if a following call succeed - informational */
3496 if (!tcon->ipc && server->ops->qfs_tcon)
3497 server->ops->qfs_tcon(xid, tcon);
6848b733 3498
24985c53
PS		 3499 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3500 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
f7910cbd 3501
66bfaadc 3502 /* tune readahead according to rsize */
8f71465c 3503 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
f7910cbd 3504
1bfe73c2 3505remote_path_check:
c1508ca2
SF		 3506#ifdef CONFIG_CIFS_DFS_UPCALL
3507 /*
3508 * Perform an unconditional check for whether there are DFS
3509 * referrals for this path without prefix, to provide support
3510 * for DFS referrals from w2k8 servers which don't seem to respond
3511 * with PATH_NOT_COVERED to requests that include the prefix.
3512 * Chase the referral if found, otherwise continue normally.
3513 */
3514 if (referral_walks_count == 0) {
af4281dc
PS		 3515 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3516 false);
c1508ca2
SF		 3517 if (!refrc) {
3518 referral_walks_count++;
3519 goto try_mount_again;
3520 }
3521 }
3522#endif
3523
f87d39d9 3524 /* check if a whole path is not remote */
70945643 3525 if (!rc && tcon) {
68889f26
PS		 3526 if (!server->ops->is_path_accessible) {
3527 rc = -ENOSYS;
3528 goto mount_fail_check;
3529 }
6d3ea7e4
SF		 3530 /*
3531 * cifs_build_path_to_root works only when we have a valid tcon
3532 */
3533 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
e4cce94c
IM		 3534 if (full_path == NULL) {
3535 rc = -ENOMEM;
3536 goto mount_fail_check;
3537 }
68889f26
PS		 3538 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3539 full_path);
03ceace5 3540 if (rc != 0 && rc != -EREMOTE) {
e4cce94c
IM		 3541 kfree(full_path);
3542 goto mount_fail_check;
3543 }
3544 kfree(full_path);
3545 }
3546
1bfe73c2
IM		 3547 /* get referral if needed */
3548 if (rc == -EREMOTE) {
d036f50f 3549#ifdef CONFIG_CIFS_DFS_UPCALL
5c2503a8
IM		 3550 if (referral_walks_count > MAX_NESTED_LINKS) {
3551 /*
3552 * BB: when we implement proper loop detection,
3553 * we will remove this check. But now we need it
3554 * to prevent an indefinite loop if 'DFS tree' is
3555 * misconfigured (i.e. has loops).
3556 */
3557 rc = -ELOOP;
3558 goto mount_fail_check;
3559 }
1bfe73c2 3560
af4281dc 3561 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
7b91e266 3562
dd613945 3563 if (!rc) {
5c2503a8 3564 referral_walks_count++;
1bfe73c2
IM		 3565 goto try_mount_again;
3566 }
dd613945 3567 goto mount_fail_check;
d036f50f
SF		 3568#else /* No DFS support, return error on mount */
3569 rc = -EOPNOTSUPP;
3570#endif
1bfe73c2
IM		 3571 }
3572
9d002df4
JL		 3573 if (rc)
3574 goto mount_fail_check;
3575
3576 /* now, hang the tcon off of the superblock */
3577 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3578 if (tlink == NULL) {
3579 rc = -ENOMEM;
3580 goto mount_fail_check;
3581 }
3582
af4281dc 3583 tlink->tl_uid = ses->linux_uid;
9d002df4
JL		 3584 tlink->tl_tcon = tcon;
3585 tlink->tl_time = jiffies;
3586 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3587 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3588
b647c35f 3589 cifs_sb->master_tlink = tlink;
9d002df4 3590 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 3591 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
9d002df4 3592 spin_unlock(&cifs_sb->tlink_tree_lock);
413e661c 3593
da472fc8 3594 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 3595 TLINK_IDLE_EXPIRE);
3596
1bfe73c2
IM		 3597mount_fail_check:
3598 /* on error free sesinfo and tcon struct if needed */
3599 if (rc) {
1bfe73c2 3600 /* If find_unc succeeded then rc == 0 so we can not end */
25985edc 3601 /* up accidentally freeing someone elses tcon struct */
1bfe73c2
IM		 3602 if (tcon)
3603 cifs_put_tcon(tcon);
af4281dc
PS		 3604 else if (ses)
3605 cifs_put_smb_ses(ses);
1bfe73c2 3606 else
af4281dc 3607 cifs_put_tcp_session(server);
dd854466 3608 bdi_destroy(&cifs_sb->bdi);
1bfe73c2
IM		 3609 }
3610
70fe7dc0 3611out:
6d5786a3 3612 free_xid(xid);
1da177e4
LT		 3613 return rc;
3614}
3615
8d1bca32
JL		 3616/*
3617 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3618 * pointer may be NULL.
3619 */
1da177e4 3620int
2e6e02ab 3621CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
96daf2b0 3622 const char *tree, struct cifs_tcon *tcon,
1da177e4
LT		 3623 const struct nls_table *nls_codepage)
3624{
3625 struct smb_hdr *smb_buffer;
3626 struct smb_hdr *smb_buffer_response;
3627 TCONX_REQ *pSMB;
3628 TCONX_RSP *pSMBr;
3629 unsigned char *bcc_ptr;
3630 int rc = 0;
690c522f
JL		 3631 int length;
3632 __u16 bytes_left, count;
1da177e4
LT		 3633
3634 if (ses == NULL)
3635 return -EIO;
3636
3637 smb_buffer = cifs_buf_get();
ca43e3be 3638 if (smb_buffer == NULL)
1da177e4 3639 return -ENOMEM;
ca43e3be 3640
1da177e4
LT		 3641 smb_buffer_response = smb_buffer;
3642
3643 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3644 NULL /*no tid */ , 4 /*wct */ );
1982c344 3645
88257360 3646 smb_buffer->Mid = get_next_mid(ses->server);
1da177e4
LT		 3647 smb_buffer->Uid = ses->Suid;
3648 pSMB = (TCONX_REQ *) smb_buffer;
3649 pSMBr = (TCONX_RSP *) smb_buffer_response;
3650
3651 pSMB->AndXCommand = 0xFF;
3652 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
1da177e4 3653 bcc_ptr = &pSMB->Password[0];
8d1bca32 3654 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
eeac8047 3655 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
7c7b25bc 3656 *bcc_ptr = 0; /* password is null byte */
eeac8047 3657 bcc_ptr++; /* skip password */
7c7b25bc 3658 /* already aligned so no need to do it below */
eeac8047 3659 } else {
540b2e37 3660 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
eeac8047
SF		 3661 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3662 specified as required (when that support is added to
3663 the vfs in the future) as only NTLM or the much
7c7b25bc 3664 weaker LANMAN (which we do not send by default) is accepted
eeac8047
SF		 3665 by Samba (not sure whether other servers allow
3666 NTLMv2 password here) */
7c7b25bc 3667#ifdef CONFIG_CIFS_WEAK_PW_HASH
04912d6a 3668 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3f618223 3669 (ses->sectype == LANMAN))
d3ba50b1 3670 calc_lanman_hash(tcon->password, ses->server->cryptkey,
96daf2b0 3671 ses->server->sec_mode &
4e53a3fb
JL		 3672 SECMODE_PW_ENCRYPT ? true : false,
3673 bcc_ptr);
7c7b25bc
SF		 3674 else
3675#endif /* CIFS_WEAK_PW_HASH */
ee2c9258 3676 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
9ef5992e 3677 bcc_ptr, nls_codepage);
eeac8047 3678
540b2e37 3679 bcc_ptr += CIFS_AUTH_RESP_SIZE;
fb8c4b14 3680 if (ses->capabilities & CAP_UNICODE) {
7c7b25bc
SF		 3681 /* must align unicode strings */
3682 *bcc_ptr = 0; /* null byte password */
3683 bcc_ptr++;
3684 }
eeac8047 3685 }
1da177e4 3686
38d77c50 3687 if (ses->server->sign)
1da177e4
LT		 3688 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3689
3690 if (ses->capabilities & CAP_STATUS32) {
3691 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3692 }
3693 if (ses->capabilities & CAP_DFS) {
3694 smb_buffer->Flags2 |= SMBFLG2_DFS;
3695 }
3696 if (ses->capabilities & CAP_UNICODE) {
3697 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3698 length =
acbbb76a 3699 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
50c2f753 3700 6 /* max utf8 char length in bytes */ *
a878fb22
SF		 3701 (/* server len*/ + 256 /* share len */), nls_codepage);
3702 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
1da177e4
LT		 3703 bcc_ptr += 2; /* skip trailing null */
3704 } else { /* ASCII */
1da177e4
LT		 3705 strcpy(bcc_ptr, tree);
3706 bcc_ptr += strlen(tree) + 1;
3707 }
3708 strcpy(bcc_ptr, "?????");
3709 bcc_ptr += strlen("?????");
3710 bcc_ptr += 1;
3711 count = bcc_ptr - &pSMB->Password[0];
be8e3b00
SF		 3712 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3713 pSMB->hdr.smb_buf_length) + count);
1da177e4
LT		 3714 pSMB->ByteCount = cpu_to_le16(count);
3715
133672ef 3716 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
7749981e 3717 0);
1da177e4 3718
1da177e4
LT		 3719 /* above now done in SendReceive */
3720 if ((rc == 0) && (tcon != NULL)) {
0e0d2cf3
SF		 3721 bool is_unicode;
3722
1da177e4 3723 tcon->tidStatus = CifsGood;
3b795210 3724 tcon->need_reconnect = false;
1da177e4
LT		 3725 tcon->tid = smb_buffer_response->Tid;
3726 bcc_ptr = pByteArea(smb_buffer_response);
690c522f 3727 bytes_left = get_bcc(smb_buffer_response);
cc20c031 3728 length = strnlen(bcc_ptr, bytes_left - 2);
0e0d2cf3
SF		 3729 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3730 is_unicode = true;
3731 else
3732 is_unicode = false;
3733
cc20c031 3734
50c2f753 3735 /* skip service field (NB: this field is always ASCII) */
7f8ed420
SF		 3736 if (length == 3) {
3737 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3738 (bcc_ptr[2] == 'C')) {
f96637be 3739 cifs_dbg(FYI, "IPC connection\n");
7f8ed420
SF		 3740 tcon->ipc = 1;
3741 }
3742 } else if (length == 2) {
3743 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3744 /* the most common case */
f96637be 3745 cifs_dbg(FYI, "disk share connection\n");
7f8ed420
SF		 3746 }
3747 }
50c2f753 3748 bcc_ptr += length + 1;
cc20c031 3749 bytes_left -= (length + 1);
46b51d08 3750 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
cc20c031
JL		 3751
3752 /* mostly informational -- no need to fail on error here */
90a98b2f 3753 kfree(tcon->nativeFileSystem);
acbbb76a 3754 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
0e0d2cf3 3755 bytes_left, is_unicode,
cc20c031
JL		 3756 nls_codepage);
3757
f96637be 3758 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
cc20c031 3759
fb8c4b14 3760 if ((smb_buffer_response->WordCount == 3) ||
1a4e15a0
SF		 3761 (smb_buffer_response->WordCount == 7))
3762 /* field is in same location */
3979877e
SF		 3763 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3764 else
3765 tcon->Flags = 0;
f96637be 3766 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
1da177e4 3767 } else if ((rc == 0) && tcon == NULL) {
50c2f753 3768 /* all we need to save for IPC$ connection */
1da177e4
LT		 3769 ses->ipc_tid = smb_buffer_response->Tid;
3770 }
3771
a8a11d39 3772 cifs_buf_release(smb_buffer);
1da177e4
LT		 3773 return rc;
3774}
3775
2e32cf5e
AV		 3776static void delayed_free(struct rcu_head *p)
3777{
3778 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3779 unload_nls(sbi->local_nls);
3780 kfree(sbi);
3781}
3782
2a9b9951
AV		 3783void
3784cifs_umount(struct cifs_sb_info *cifs_sb)
1da177e4 3785{
b647c35f
JL		 3786 struct rb_root *root = &cifs_sb->tlink_tree;
3787 struct rb_node *node;
3788 struct tcon_link *tlink;
9d002df4 3789
2de970ff
JL		 3790 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3791
b647c35f
JL		 3792 spin_lock(&cifs_sb->tlink_tree_lock);
3793 while ((node = rb_first(root))) {
3794 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3795 cifs_get_tlink(tlink);
3796 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3797 rb_erase(node, root);
1da177e4 3798
b647c35f
JL		 3799 spin_unlock(&cifs_sb->tlink_tree_lock);
3800 cifs_put_tlink(tlink);
3801 spin_lock(&cifs_sb->tlink_tree_lock);
3802 }
3803 spin_unlock(&cifs_sb->tlink_tree_lock);
50c2f753 3804
dd854466 3805 bdi_destroy(&cifs_sb->bdi);
d757d71b 3806 kfree(cifs_sb->mountdata);
2e32cf5e 3807 call_rcu(&cifs_sb->rcu, delayed_free);
50c2f753 3808}
1da177e4 3809
286170aa
PS		 3810int
3811cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
1da177e4
LT		 3812{
3813 int rc = 0;
198b5682 3814 struct TCP_Server_Info *server = ses->server;
1da177e4 3815
286170aa
PS		 3816 if (!server->ops->need_neg || !server->ops->negotiate)
3817 return -ENOSYS;
3818
198b5682 3819 /* only send once per connect */
286170aa 3820 if (!server->ops->need_neg(server))
198b5682
JL		 3821 return 0;
3822
45275789 3823 set_credits(server, 1);
286170aa
PS		 3824
3825 rc = server->ops->negotiate(xid, ses);
198b5682
JL		 3826 if (rc == 0) {
3827 spin_lock(&GlobalMid_Lock);
7fdbaa1b 3828 if (server->tcpStatus == CifsNeedNegotiate)
198b5682
JL		 3829 server->tcpStatus = CifsGood;
3830 else
3831 rc = -EHOSTDOWN;
3832 spin_unlock(&GlobalMid_Lock);
198b5682
JL		 3833 }
3834
3835 return rc;
3836}
3837
58c45c58
PS		 3838int
3839cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3840 struct nls_table *nls_info)
198b5682 3841{
58c45c58 3842 int rc = -ENOSYS;
198b5682 3843 struct TCP_Server_Info *server = ses->server;
26b994fa 3844
198b5682 3845 ses->capabilities = server->capabilities;
26b994fa 3846 if (linuxExtEnabled == 0)
29e20f9c 3847 ses->capabilities &= (~server->vals->cap_unix);
20418acd 3848
f96637be 3849 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
96daf2b0 3850 server->sec_mode, server->capabilities, server->timeAdj);
cb7691b6 3851
58c45c58
PS		 3852 if (server->ops->sess_setup)
3853 rc = server->ops->sess_setup(xid, ses, nls_info);
3854
d4e63bd6 3855 if (rc)
f96637be 3856 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
21e73393 3857
1da177e4
LT		 3858 return rc;
3859}
3860
8a8798a5
JL		 3861static int
3862cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3863{
3f618223
JL		 3864 vol->sectype = ses->sectype;
3865
3866 /* krb5 is special, since we don't need username or pw */
3867 if (vol->sectype == Kerberos)
8a8798a5 3868 return 0;
8a8798a5
JL		 3869
3870 return cifs_set_cifscreds(vol, ses);
3871}
3872
96daf2b0 3873static struct cifs_tcon *
6d4a0832 3874cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
9d002df4 3875{
8a8798a5 3876 int rc;
96daf2b0
SF		 3877 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3878 struct cifs_ses *ses;
3879 struct cifs_tcon *tcon = NULL;
9d002df4 3880 struct smb_vol *vol_info;
9d002df4
JL		 3881
3882 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
803ab977
DC		 3883 if (vol_info == NULL)
3884 return ERR_PTR(-ENOMEM);
9d002df4 3885
9d002df4
JL		 3886 vol_info->local_nls = cifs_sb->local_nls;
3887 vol_info->linux_uid = fsuid;
3888 vol_info->cred_uid = fsuid;
3889 vol_info->UNC = master_tcon->treeName;
3890 vol_info->retry = master_tcon->retry;
3891 vol_info->nocase = master_tcon->nocase;
3892 vol_info->local_lease = master_tcon->local_lease;
3893 vol_info->no_linux_ext = !master_tcon->unix_ext;
28e11bd8
JL		 3894 vol_info->sectype = master_tcon->ses->sectype;
3895 vol_info->sign = master_tcon->ses->sign;
9d002df4 3896
8a8798a5
JL		 3897 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3898 if (rc) {
3899 tcon = ERR_PTR(rc);
3900 goto out;
3901 }
9d002df4
JL		 3902
3903 /* get a reference for the same TCP session */
3f9bcca7 3904 spin_lock(&cifs_tcp_ses_lock);
9d002df4 3905 ++master_tcon->ses->server->srv_count;
3f9bcca7 3906 spin_unlock(&cifs_tcp_ses_lock);
9d002df4
JL		 3907
3908 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3909 if (IS_ERR(ses)) {
96daf2b0 3910 tcon = (struct cifs_tcon *)ses;
9d002df4
JL		 3911 cifs_put_tcp_session(master_tcon->ses->server);
3912 goto out;
3913 }
3914
3915 tcon = cifs_get_tcon(ses, vol_info);
3916 if (IS_ERR(tcon)) {
3917 cifs_put_smb_ses(ses);
3918 goto out;
3919 }
3920
29e20f9c 3921 if (cap_unix(ses))
9d002df4
JL		 3922 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3923out:
8a8798a5
JL		 3924 kfree(vol_info->username);
3925 kfree(vol_info->password);
9d002df4
JL		 3926 kfree(vol_info);
3927
3928 return tcon;
3929}
3930
96daf2b0 3931struct cifs_tcon *
9d002df4
JL		 3932cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3933{
3934 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3935}
3936
b647c35f
JL		 3937/* find and return a tlink with given uid */
3938static struct tcon_link *
6d4a0832 3939tlink_rb_search(struct rb_root *root, kuid_t uid)
b647c35f
JL		 3940{
3941 struct rb_node *node = root->rb_node;
3942 struct tcon_link *tlink;
3943
3944 while (node) {
3945 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3946
6d4a0832 3947 if (uid_gt(tlink->tl_uid, uid))
b647c35f 3948 node = node->rb_left;
6d4a0832 3949 else if (uid_lt(tlink->tl_uid, uid))
b647c35f
JL		 3950 node = node->rb_right;
3951 else
3952 return tlink;
3953 }
3954 return NULL;
3955}
3956
3957/* insert a tcon_link into the tree */
3958static void
3959tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3960{
3961 struct rb_node **new = &(root->rb_node), *parent = NULL;
3962 struct tcon_link *tlink;
3963
3964 while (*new) {
3965 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3966 parent = *new;
3967
6d4a0832 3968 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
b647c35f
JL		 3969 new = &((*new)->rb_left);
3970 else
3971 new = &((*new)->rb_right);
3972 }
3973
3974 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3975 rb_insert_color(&new_tlink->tl_rbnode, root);
3976}
3977
9d002df4
JL		 3978/*
3979 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3980 * current task.
3981 *
3982 * If the superblock doesn't refer to a multiuser mount, then just return
3983 * the master tcon for the mount.
3984 *
6ef933a3 3985 * First, search the rbtree for an existing tcon for this fsuid. If one
9d002df4
JL		 3986 * exists, then check to see if it's pending construction. If it is then wait
3987 * for construction to complete. Once it's no longer pending, check to see if
3988 * it failed and either return an error or retry construction, depending on
3989 * the timeout.
3990 *
3991 * If one doesn't exist then insert a new tcon_link struct into the tree and
3992 * try to construct a new one.
3993 */
3994struct tcon_link *
3995cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3996{
3997 int ret;
6d4a0832 3998 kuid_t fsuid = current_fsuid();
9d002df4
JL		 3999 struct tcon_link *tlink, *newtlink;
4000
4001 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4002 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4003
4004 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 4005 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4006 if (tlink)
4007 cifs_get_tlink(tlink);
4008 spin_unlock(&cifs_sb->tlink_tree_lock);
4009
4010 if (tlink == NULL) {
4011 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4012 if (newtlink == NULL)
4013 return ERR_PTR(-ENOMEM);
b647c35f 4014 newtlink->tl_uid = fsuid;
9d002df4
JL		 4015 newtlink->tl_tcon = ERR_PTR(-EACCES);
4016 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4017 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4018 cifs_get_tlink(newtlink);
4019
9d002df4
JL		 4020 spin_lock(&cifs_sb->tlink_tree_lock);
4021 /* was one inserted after previous search? */
b647c35f 4022 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4023 if (tlink) {
4024 cifs_get_tlink(tlink);
4025 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4026 kfree(newtlink);
4027 goto wait_for_construction;
4028 }
9d002df4 4029 tlink = newtlink;
b647c35f
JL		 4030 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4031 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4032 } else {
4033wait_for_construction:
4034 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
9d002df4
JL		 4035 TASK_INTERRUPTIBLE);
4036 if (ret) {
4037 cifs_put_tlink(tlink);
74316201 4038 return ERR_PTR(-ERESTARTSYS);
9d002df4
JL		 4039 }
4040
4041 /* if it's good, return it */
4042 if (!IS_ERR(tlink->tl_tcon))
4043 return tlink;
4044
4045 /* return error if we tried this already recently */
4046 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4047 cifs_put_tlink(tlink);
4048 return ERR_PTR(-EACCES);
4049 }
4050
4051 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4052 goto wait_for_construction;
4053 }
4054
4055 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4056 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4057 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4058
4059 if (IS_ERR(tlink->tl_tcon)) {
4060 cifs_put_tlink(tlink);
4061 return ERR_PTR(-EACCES);
4062 }
4063
4064 return tlink;
4065}
2de970ff
JL		 4066
4067/*
4068 * periodic workqueue job that scans tcon_tree for a superblock and closes
4069 * out tcons.
4070 */
4071static void
4072cifs_prune_tlinks(struct work_struct *work)
4073{
4074 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4075 prune_tlinks.work);
b647c35f
JL		 4076 struct rb_root *root = &cifs_sb->tlink_tree;
4077 struct rb_node *node = rb_first(root);
4078 struct rb_node *tmp;
4079 struct tcon_link *tlink;
2de970ff 4080
b647c35f
JL		 4081 /*
4082 * Because we drop the spinlock in the loop in order to put the tlink
4083 * it's not guarded against removal of links from the tree. The only
4084 * places that remove entries from the tree are this function and
4085 * umounts. Because this function is non-reentrant and is canceled
4086 * before umount can proceed, this is safe.
4087 */
4088 spin_lock(&cifs_sb->tlink_tree_lock);
4089 node = rb_first(root);
4090 while (node != NULL) {
4091 tmp = node;
4092 node = rb_next(tmp);
4093 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4094
4095 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4096 atomic_read(&tlink->tl_count) != 0 ||
4097 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4098 continue;
2de970ff 4099
b647c35f
JL		 4100 cifs_get_tlink(tlink);
4101 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4102 rb_erase(tmp, root);
4103
4104 spin_unlock(&cifs_sb->tlink_tree_lock);
4105 cifs_put_tlink(tlink);
4106 spin_lock(&cifs_sb->tlink_tree_lock);
4107 }
4108 spin_unlock(&cifs_sb->tlink_tree_lock);
2de970ff 4109
da472fc8 4110 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 4111 TLINK_IDLE_EXPIRE);
4112}
Linux kernel - Deliverables
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