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Replace <asm/uaccess.h> with <linux/uaccess.h> globally
[linux-2.6-block.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>
7c0f6ba6 37#include <linux/uaccess.h>
1da177e4 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 43#include <linux/parser.h>
2f8b5444 44#include <linux/bvec.h>
8830d7e0 45
1da177e4
LT		 46#include "cifspdu.h"
47#include "cifsglob.h"
48#include "cifsproto.h"
49#include "cifs_unicode.h"
50#include "cifs_debug.h"
51#include "cifs_fs_sb.h"
52#include "ntlmssp.h"
53#include "nterr.h"
54#include "rfc1002pdu.h"
488f1d2d 55#include "fscache.h"
53e0e11e
PS		 56#ifdef CONFIG_CIFS_SMB2
57#include "smb2proto.h"
58#endif
1da177e4
LT		 59
60#define CIFS_PORT 445
61#define RFC1001_PORT 139
62
1da177e4
LT		 63extern mempool_t *cifs_req_poolp;
64
2de970ff 65/* FIXME: should these be tunable? */
9d002df4 66#define TLINK_ERROR_EXPIRE (1 * HZ)
2de970ff 67#define TLINK_IDLE_EXPIRE (600 * HZ)
9d002df4 68
8830d7e0 69enum {
8830d7e0
SP		 70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
72bd481f 73 Opt_forcegid, Opt_noforcegid,
8830d7e0
SP		 74 Opt_noblocksend, Opt_noautotune,
75 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
2baa2682 76 Opt_mapposix, Opt_nomapposix,
8830d7e0
SP		 77 Opt_mapchars, Opt_nomapchars, Opt_sfu,
78 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
79 Opt_noposixpaths, Opt_nounix,
80 Opt_nocase,
81 Opt_brl, Opt_nobrl,
95932655 82 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
8830d7e0
SP		 83 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
84 Opt_nohard, Opt_nosoft,
85 Opt_nointr, Opt_intr,
86 Opt_nostrictsync, Opt_strictsync,
87 Opt_serverino, Opt_noserverino,
88 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
89 Opt_acl, Opt_noacl, Opt_locallease,
1b359204 90 Opt_sign, Opt_seal, Opt_noac,
8830d7e0 91 Opt_fsc, Opt_mfsymlinks,
a0b3df5c 92 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
b2a30774 93 Opt_persistent, Opt_nopersistent,
592fafe6 94 Opt_resilient, Opt_noresilient,
39566443 95 Opt_domainauto,
8830d7e0
SP		 96
97 /* Mount options which take numeric value */
98 Opt_backupuid, Opt_backupgid, Opt_uid,
99 Opt_cruid, Opt_gid, Opt_file_mode,
100 Opt_dirmode, Opt_port,
101 Opt_rsize, Opt_wsize, Opt_actimeo,
141891f4 102 Opt_echo_interval, Opt_max_credits,
8b217fe7 103 Opt_snapshot,
8830d7e0
SP		 104
105 /* Mount options which take string value */
106 Opt_user, Opt_pass, Opt_ip,
73a999fa 107 Opt_domain, Opt_srcaddr, Opt_iocharset,
8830d7e0 108 Opt_netbiosname, Opt_servern,
23db65f5 109 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
8830d7e0
SP		 110
111 /* Mount options to be ignored */
112 Opt_ignore,
113
114 /* Options which could be blank */
115 Opt_blank_pass,
4fe9e963
SP		 116 Opt_blank_user,
117 Opt_blank_ip,
8830d7e0
SP		 118
119 Opt_err
120};
121
122static const match_table_t cifs_mount_option_tokens = {
123
124 { Opt_user_xattr, "user_xattr" },
125 { Opt_nouser_xattr, "nouser_xattr" },
126 { Opt_forceuid, "forceuid" },
127 { Opt_noforceuid, "noforceuid" },
72bd481f
JL		 128 { Opt_forcegid, "forcegid" },
129 { Opt_noforcegid, "noforcegid" },
8830d7e0
SP		 130 { Opt_noblocksend, "noblocksend" },
131 { Opt_noautotune, "noautotune" },
132 { Opt_hard, "hard" },
133 { Opt_soft, "soft" },
134 { Opt_perm, "perm" },
135 { Opt_noperm, "noperm" },
2baa2682 136 { Opt_mapchars, "mapchars" }, /* SFU style */
8830d7e0 137 { Opt_nomapchars, "nomapchars" },
2baa2682
SF		 138 { Opt_mapposix, "mapposix" }, /* SFM style */
139 { Opt_nomapposix, "nomapposix" },
8830d7e0
SP		 140 { Opt_sfu, "sfu" },
141 { Opt_nosfu, "nosfu" },
142 { Opt_nodfs, "nodfs" },
143 { Opt_posixpaths, "posixpaths" },
144 { Opt_noposixpaths, "noposixpaths" },
145 { Opt_nounix, "nounix" },
146 { Opt_nounix, "nolinux" },
147 { Opt_nocase, "nocase" },
148 { Opt_nocase, "ignorecase" },
149 { Opt_brl, "brl" },
150 { Opt_nobrl, "nobrl" },
151 { Opt_nobrl, "nolock" },
152 { Opt_forcemandatorylock, "forcemandatorylock" },
5cfdddcf 153 { Opt_forcemandatorylock, "forcemand" },
8830d7e0
SP		 154 { Opt_setuids, "setuids" },
155 { Opt_nosetuids, "nosetuids" },
95932655 156 { Opt_setuidfromacl, "idsfromsid" },
8830d7e0
SP		 157 { Opt_dynperm, "dynperm" },
158 { Opt_nodynperm, "nodynperm" },
159 { Opt_nohard, "nohard" },
160 { Opt_nosoft, "nosoft" },
161 { Opt_nointr, "nointr" },
162 { Opt_intr, "intr" },
163 { Opt_nostrictsync, "nostrictsync" },
164 { Opt_strictsync, "strictsync" },
165 { Opt_serverino, "serverino" },
166 { Opt_noserverino, "noserverino" },
167 { Opt_rwpidforward, "rwpidforward" },
168 { Opt_cifsacl, "cifsacl" },
169 { Opt_nocifsacl, "nocifsacl" },
170 { Opt_acl, "acl" },
171 { Opt_noacl, "noacl" },
172 { Opt_locallease, "locallease" },
173 { Opt_sign, "sign" },
174 { Opt_seal, "seal" },
8830d7e0
SP		 175 { Opt_noac, "noac" },
176 { Opt_fsc, "fsc" },
177 { Opt_mfsymlinks, "mfsymlinks" },
178 { Opt_multiuser, "multiuser" },
d8162558 179 { Opt_sloppy, "sloppy" },
a0b3df5c 180 { Opt_nosharesock, "nosharesock" },
b2a30774
SF		 181 { Opt_persistent, "persistenthandles"},
182 { Opt_nopersistent, "nopersistenthandles"},
592fafe6
SF		 183 { Opt_resilient, "resilienthandles"},
184 { Opt_noresilient, "noresilienthandles"},
39566443 185 { Opt_domainauto, "domainauto"},
8830d7e0
SP		 186
187 { Opt_backupuid, "backupuid=%s" },
188 { Opt_backupgid, "backupgid=%s" },
189 { Opt_uid, "uid=%s" },
190 { Opt_cruid, "cruid=%s" },
191 { Opt_gid, "gid=%s" },
192 { Opt_file_mode, "file_mode=%s" },
193 { Opt_dirmode, "dirmode=%s" },
194 { Opt_dirmode, "dir_mode=%s" },
195 { Opt_port, "port=%s" },
196 { Opt_rsize, "rsize=%s" },
197 { Opt_wsize, "wsize=%s" },
198 { Opt_actimeo, "actimeo=%s" },
adfeb3e0 199 { Opt_echo_interval, "echo_interval=%s" },
141891f4 200 { Opt_max_credits, "max_credits=%s" },
8b217fe7 201 { Opt_snapshot, "snapshot=%s" },
8830d7e0 202
4fe9e963
SP		 203 { Opt_blank_user, "user=" },
204 { Opt_blank_user, "username=" },
8830d7e0
SP		 205 { Opt_user, "user=%s" },
206 { Opt_user, "username=%s" },
207 { Opt_blank_pass, "pass=" },
3c15b4cf 208 { Opt_blank_pass, "password=" },
8830d7e0
SP		 209 { Opt_pass, "pass=%s" },
210 { Opt_pass, "password=%s" },
4fe9e963
SP		 211 { Opt_blank_ip, "ip=" },
212 { Opt_blank_ip, "addr=" },
8830d7e0
SP		 213 { Opt_ip, "ip=%s" },
214 { Opt_ip, "addr=%s" },
73a999fa
JL		 215 { Opt_ignore, "unc=%s" },
216 { Opt_ignore, "target=%s" },
217 { Opt_ignore, "path=%s" },
8830d7e0
SP		 218 { Opt_domain, "dom=%s" },
219 { Opt_domain, "domain=%s" },
220 { Opt_domain, "workgroup=%s" },
221 { Opt_srcaddr, "srcaddr=%s" },
73a999fa 222 { Opt_ignore, "prefixpath=%s" },
8830d7e0 223 { Opt_iocharset, "iocharset=%s" },
8830d7e0
SP		 224 { Opt_netbiosname, "netbiosname=%s" },
225 { Opt_servern, "servern=%s" },
226 { Opt_ver, "ver=%s" },
23db65f5 227 { Opt_vers, "vers=%s" },
8830d7e0 228 { Opt_sec, "sec=%s" },
15b6a473 229 { Opt_cache, "cache=%s" },
8830d7e0
SP		 230
231 { Opt_ignore, "cred" },
232 { Opt_ignore, "credentials" },
a557b976
JL		 233 { Opt_ignore, "cred=%s" },
234 { Opt_ignore, "credentials=%s" },
8830d7e0
SP		 235 { Opt_ignore, "guest" },
236 { Opt_ignore, "rw" },
237 { Opt_ignore, "ro" },
238 { Opt_ignore, "suid" },
239 { Opt_ignore, "nosuid" },
240 { Opt_ignore, "exec" },
241 { Opt_ignore, "noexec" },
242 { Opt_ignore, "nodev" },
243 { Opt_ignore, "noauto" },
244 { Opt_ignore, "dev" },
245 { Opt_ignore, "mand" },
246 { Opt_ignore, "nomand" },
247 { Opt_ignore, "_netdev" },
248
249 { Opt_err, NULL }
250};
251
252enum {
253 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
254 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
7659624f
JL		 255 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
256 Opt_sec_ntlmv2i, Opt_sec_lanman,
8830d7e0
SP		 257 Opt_sec_none,
258
259 Opt_sec_err
260};
261
262static const match_table_t cifs_secflavor_tokens = {
263 { Opt_sec_krb5, "krb5" },
264 { Opt_sec_krb5i, "krb5i" },
265 { Opt_sec_krb5p, "krb5p" },
266 { Opt_sec_ntlmsspi, "ntlmsspi" },
267 { Opt_sec_ntlmssp, "ntlmssp" },
268 { Opt_ntlm, "ntlm" },
269 { Opt_sec_ntlmi, "ntlmi" },
7659624f
JL		 270 { Opt_sec_ntlmv2, "nontlm" },
271 { Opt_sec_ntlmv2, "ntlmv2" },
8830d7e0 272 { Opt_sec_ntlmv2i, "ntlmv2i" },
8830d7e0
SP		 273 { Opt_sec_lanman, "lanman" },
274 { Opt_sec_none, "none" },
275
276 { Opt_sec_err, NULL }
277};
278
15b6a473
JL		 279/* cache flavors */
280enum {
281 Opt_cache_loose,
282 Opt_cache_strict,
283 Opt_cache_none,
284 Opt_cache_err
285};
286
287static const match_table_t cifs_cacheflavor_tokens = {
288 { Opt_cache_loose, "loose" },
289 { Opt_cache_strict, "strict" },
290 { Opt_cache_none, "none" },
291 { Opt_cache_err, NULL }
292};
293
23db65f5
JL		 294static const match_table_t cifs_smb_version_tokens = {
295 { Smb_1, SMB1_VERSION_STRING },
dd446b16 296 { Smb_20, SMB20_VERSION_STRING},
1080ef75 297 { Smb_21, SMB21_VERSION_STRING },
e4aa25e7 298 { Smb_30, SMB30_VERSION_STRING },
20b6d8b4 299 { Smb_302, SMB302_VERSION_STRING },
5f7fbf73
SF		 300#ifdef CONFIG_CIFS_SMB311
301 { Smb_311, SMB311_VERSION_STRING },
aab1893d 302 { Smb_311, ALT_SMB311_VERSION_STRING },
5f7fbf73
SF		 303#endif /* SMB311 */
304 { Smb_version_err, NULL }
23db65f5
JL		 305};
306
a9f1b85e
PS		 307static int ip_connect(struct TCP_Server_Info *server);
308static int generic_ip_connect(struct TCP_Server_Info *server);
b647c35f 309static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
2de970ff 310static void cifs_prune_tlinks(struct work_struct *work);
b9bce2e9
JL		 311static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
312 const char *devname);
1da177e4 313
d5c5605c
JL		 314/*
315 * cifs tcp session reconnection
316 *
317 * mark tcp session as reconnecting so temporarily locked
318 * mark all smb sessions as reconnecting for tcp session
319 * reconnect tcp session
320 * wake up waiters on reconnection? - (not needed currently)
321 */
28ea5290 322int
1da177e4
LT		 323cifs_reconnect(struct TCP_Server_Info *server)
324{
325 int rc = 0;
f1987b44 326 struct list_head *tmp, *tmp2;
96daf2b0
SF		 327 struct cifs_ses *ses;
328 struct cifs_tcon *tcon;
fb8c4b14 329 struct mid_q_entry *mid_entry;
3c1105df 330 struct list_head retry_list;
50c2f753 331
1da177e4 332 spin_lock(&GlobalMid_Lock);
469ee614 333 if (server->tcpStatus == CifsExiting) {
fb8c4b14 334 /* the demux thread will exit normally
1da177e4
LT		 335 next time through the loop */
336 spin_unlock(&GlobalMid_Lock);
337 return rc;
338 } else
339 server->tcpStatus = CifsNeedReconnect;
340 spin_unlock(&GlobalMid_Lock);
341 server->maxBuf = 0;
aa24d1e9
PS		 342#ifdef CONFIG_CIFS_SMB2
343 server->max_read = 0;
344#endif
1da177e4 345
f96637be 346 cifs_dbg(FYI, "Reconnecting tcp session\n");
1da177e4
LT		 347
348 /* before reconnecting the tcp session, mark the smb session (uid)
349 and the tid bad so they are not used until reconnected */
f96637be
JP		 350 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
351 __func__);
3f9bcca7 352 spin_lock(&cifs_tcp_ses_lock);
14fbf50d 353 list_for_each(tmp, &server->smb_ses_list) {
96daf2b0 354 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
14fbf50d
JL		 355 ses->need_reconnect = true;
356 ses->ipc_tid = 0;
f1987b44 357 list_for_each(tmp2, &ses->tcon_list) {
96daf2b0 358 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
3b795210 359 tcon->need_reconnect = true;
1da177e4 360 }
1da177e4 361 }
3f9bcca7 362 spin_unlock(&cifs_tcp_ses_lock);
2b84a36c 363
1da177e4 364 /* do not want to be sending data on a socket we are freeing */
f96637be 365 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
72ca545b 366 mutex_lock(&server->srv_mutex);
fb8c4b14 367 if (server->ssocket) {
f96637be
JP		 368 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
369 server->ssocket->state, server->ssocket->flags);
91cf45f0 370 kernel_sock_shutdown(server->ssocket, SHUT_WR);
f96637be
JP		 371 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
372 server->ssocket->state, server->ssocket->flags);
1da177e4
LT		 373 sock_release(server->ssocket);
374 server->ssocket = NULL;
375 }
5d0d2882
SP		 376 server->sequence_number = 0;
377 server->session_estab = false;
21e73393
SP		 378 kfree(server->session_key.response);
379 server->session_key.response = NULL;
380 server->session_key.len = 0;
fda35943 381 server->lstrp = jiffies;
1da177e4 382
2b84a36c 383 /* mark submitted MIDs for retry and issue callback */
3c1105df 384 INIT_LIST_HEAD(&retry_list);
f96637be 385 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
1da177e4 386 spin_lock(&GlobalMid_Lock);
2b84a36c
JL		 387 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
388 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
7c9421e1
PS		 389 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
390 mid_entry->mid_state = MID_RETRY_NEEDED;
3c1105df
JL		 391 list_move(&mid_entry->qhead, &retry_list);
392 }
393 spin_unlock(&GlobalMid_Lock);
820962dc 394 mutex_unlock(&server->srv_mutex);
3c1105df 395
f96637be 396 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
3c1105df
JL		 397 list_for_each_safe(tmp, tmp2, &retry_list) {
398 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
2b84a36c
JL		 399 list_del_init(&mid_entry->qhead);
400 mid_entry->callback(mid_entry);
1da177e4 401 }
1da177e4 402
7fdbaa1b 403 do {
6c3d8909 404 try_to_freeze();
a9f1b85e
PS		 405
406 /* we should try only the port we connected to before */
73e216a8 407 mutex_lock(&server->srv_mutex);
a9f1b85e 408 rc = generic_ip_connect(server);
fb8c4b14 409 if (rc) {
f96637be 410 cifs_dbg(FYI, "reconnect error %d\n", rc);
4afe260b 411 mutex_unlock(&server->srv_mutex);
0cb766ae 412 msleep(3000);
1da177e4
LT		 413 } else {
414 atomic_inc(&tcpSesReconnectCount);
415 spin_lock(&GlobalMid_Lock);
469ee614 416 if (server->tcpStatus != CifsExiting)
fd88ce93 417 server->tcpStatus = CifsNeedNegotiate;
fb8c4b14 418 spin_unlock(&GlobalMid_Lock);
4afe260b 419 mutex_unlock(&server->srv_mutex);
1da177e4 420 }
7fdbaa1b 421 } while (server->tcpStatus == CifsNeedReconnect);
2b84a36c 422
b8c60012
SP		 423 if (server->tcpStatus == CifsNeedNegotiate)
424 mod_delayed_work(cifsiod_wq, &server->echo, 0);
425
1da177e4
LT		 426 return rc;
427}
428
c74093b6
JL		 429static void
430cifs_echo_request(struct work_struct *work)
431{
432 int rc;
433 struct TCP_Server_Info *server = container_of(work,
434 struct TCP_Server_Info, echo.work);
b8c60012
SP		 435 unsigned long echo_interval;
436
437 /*
438 * If we need to renegotiate, set echo interval to zero to
439 * immediately call echo service where we can renegotiate.
440 */
441 if (server->tcpStatus == CifsNeedNegotiate)
442 echo_interval = 0;
443 else
444 echo_interval = server->echo_interval;
c74093b6 445
247ec9b4 446 /*
b8c60012
SP		 447 * We cannot send an echo if it is disabled.
448 * Also, no need to ping if we got a response recently.
247ec9b4 449 */
4fcd1813
SF		 450
451 if (server->tcpStatus == CifsNeedReconnect ||
b8c60012
SP		 452 server->tcpStatus == CifsExiting ||
453 server->tcpStatus == CifsNew ||
f6d76178 454 (server->ops->can_echo && !server->ops->can_echo(server)) ||
adfeb3e0 455 time_before(jiffies, server->lstrp + echo_interval - HZ))
c74093b6
JL		 456 goto requeue_echo;
457
f6d76178 458 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
c74093b6 459 if (rc)
f96637be
JP		 460 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
461 server->hostname);
c74093b6
JL		 462
463requeue_echo:
b8c60012 464 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
c74093b6
JL		 465}
466
3d9c2472 467static bool
2a37ef94 468allocate_buffers(struct TCP_Server_Info *server)
3d9c2472 469{
2a37ef94
JL		 470 if (!server->bigbuf) {
471 server->bigbuf = (char *)cifs_buf_get();
472 if (!server->bigbuf) {
f96637be 473 cifs_dbg(VFS, "No memory for large SMB response\n");
3d9c2472
PS		 474 msleep(3000);
475 /* retry will check if exiting */
476 return false;
477 }
2a37ef94 478 } else if (server->large_buf) {
3d9c2472 479 /* we are reusing a dirty large buf, clear its start */
1887f601 480 memset(server->bigbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 481 }
482
2a37ef94
JL		 483 if (!server->smallbuf) {
484 server->smallbuf = (char *)cifs_small_buf_get();
485 if (!server->smallbuf) {
f96637be 486 cifs_dbg(VFS, "No memory for SMB response\n");
3d9c2472
PS		 487 msleep(1000);
488 /* retry will check if exiting */
489 return false;
490 }
491 /* beginning of smb buffer is cleared in our buf_get */
492 } else {
493 /* if existing small buf clear beginning */
1887f601 494 memset(server->smallbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 495 }
496
3d9c2472
PS		 497 return true;
498}
499
ba749e6d
JL		 500static bool
501server_unresponsive(struct TCP_Server_Info *server)
502{
6dae51a5
PS		 503 /*
504 * We need to wait 2 echo intervals to make sure we handle such
505 * situations right:
506 * 1s client sends a normal SMB request
507 * 2s client gets a response
508 * 30s echo workqueue job pops, and decides we got a response recently
509 * and don't need to send another
510 * ...
511 * 65s kernel_recvmsg times out, and we see that we haven't gotten
512 * a response in >60s.
513 */
514 if (server->tcpStatus == CifsGood &&
adfeb3e0
SF		 515 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
516 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
517 server->hostname, (2 * server->echo_interval) / HZ);
ba749e6d
JL		 518 cifs_reconnect(server);
519 wake_up(&server->response_q);
520 return true;
521 }
522
523 return false;
524}
525
71335664
AV		 526static int
527cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
e7015fb1 528{
a52c1eb7
JL		 529 int length = 0;
530 int total_read;
e7015fb1 531
71335664
AV		 532 smb_msg->msg_control = NULL;
533 smb_msg->msg_controllen = 0;
e831e6cf 534
71335664 535 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
95edcff4
JL		 536 try_to_freeze();
537
71335664
AV		 538 if (server_unresponsive(server))
539 return -ECONNABORTED;
ba749e6d 540
71335664 541 length = sock_recvmsg(server->ssocket, smb_msg, 0);
42c4dfc2 542
71335664
AV		 543 if (server->tcpStatus == CifsExiting)
544 return -ESHUTDOWN;
e7015fb1 545
71335664 546 if (server->tcpStatus == CifsNeedReconnect) {
e7015fb1 547 cifs_reconnect(server);
71335664
AV		 548 return -ECONNABORTED;
549 }
550
551 if (length == -ERESTARTSYS ||
552 length == -EAGAIN ||
553 length == -EINTR) {
e7015fb1
PS		 554 /*
555 * Minimum sleep to prevent looping, allowing socket
556 * to clear and app threads to set tcpStatus
557 * CifsNeedReconnect if server hung.
558 */
559 usleep_range(1000, 2000);
560 length = 0;
a52c1eb7 561 continue;
71335664
AV		 562 }
563
564 if (length <= 0) {
09aab880 565 cifs_dbg(FYI, "Received no data or error: %d\n", length);
e7015fb1 566 cifs_reconnect(server);
71335664 567 return -ECONNABORTED;
e7015fb1
PS		 568 }
569 }
a52c1eb7 570 return total_read;
e7015fb1 571}
e7015fb1 572
e28bc5b1
JL		 573int
574cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
575 unsigned int to_read)
42c4dfc2 576{
71335664
AV		 577 struct msghdr smb_msg;
578 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
579 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
42c4dfc2 580
71335664
AV		 581 return cifs_readv_from_socket(server, &smb_msg);
582}
42c4dfc2 583
71335664
AV		 584int
585cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
586 unsigned int to_read)
587{
588 struct msghdr smb_msg;
589 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
590 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
591 return cifs_readv_from_socket(server, &smb_msg);
e7015fb1
PS		 592}
593
98bac62c 594static bool
fe11e4cc 595is_smb_response(struct TCP_Server_Info *server, unsigned char type)
98bac62c 596{
98bac62c
PS		 597 /*
598 * The first byte big endian of the length field,
599 * is actually not part of the length but the type
600 * with the most common, zero, as regular data.
601 */
fe11e4cc
JL		 602 switch (type) {
603 case RFC1002_SESSION_MESSAGE:
604 /* Regular SMB response */
605 return true;
606 case RFC1002_SESSION_KEEP_ALIVE:
f96637be 607 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
fe11e4cc
JL		 608 break;
609 case RFC1002_POSITIVE_SESSION_RESPONSE:
f96637be 610 cifs_dbg(FYI, "RFC 1002 positive session response\n");
fe11e4cc
JL		 611 break;
612 case RFC1002_NEGATIVE_SESSION_RESPONSE:
98bac62c
PS		 613 /*
614 * We get this from Windows 98 instead of an error on
615 * SMB negprot response.
616 */
f96637be 617 cifs_dbg(FYI, "RFC 1002 negative session response\n");
98bac62c
PS		 618 /* give server a second to clean up */
619 msleep(1000);
620 /*
621 * Always try 445 first on reconnect since we get NACK
622 * on some if we ever connected to port 139 (the NACK
623 * is since we do not begin with RFC1001 session
624 * initialize frame).
625 */
fe11e4cc 626 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
98bac62c
PS		 627 cifs_reconnect(server);
628 wake_up(&server->response_q);
fe11e4cc
JL		 629 break;
630 default:
f96637be 631 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
98bac62c 632 cifs_reconnect(server);
98bac62c
PS		 633 }
634
fe11e4cc 635 return false;
98bac62c
PS		 636}
637
e28bc5b1
JL		 638void
639dequeue_mid(struct mid_q_entry *mid, bool malformed)
ea1f4502 640{
ad69bae1 641#ifdef CONFIG_CIFS_STATS2
ea1f4502 642 mid->when_received = jiffies;
ad69bae1 643#endif
ea1f4502
JL		 644 spin_lock(&GlobalMid_Lock);
645 if (!malformed)
7c9421e1 646 mid->mid_state = MID_RESPONSE_RECEIVED;
ea1f4502 647 else
7c9421e1 648 mid->mid_state = MID_RESPONSE_MALFORMED;
ea1f4502 649 list_del_init(&mid->qhead);
ad69bae1 650 spin_unlock(&GlobalMid_Lock);
ea1f4502 651}
ad69bae1 652
c8054ebd
JL		 653static void
654handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
d4e4854f 655 char *buf, int malformed)
ea1f4502 656{
316cf94a
PS		 657 if (server->ops->check_trans2 &&
658 server->ops->check_trans2(mid, server, buf, malformed))
c8054ebd 659 return;
ea1f4502 660 mid->resp_buf = buf;
7c9421e1 661 mid->large_buf = server->large_buf;
2a37ef94
JL		 662 /* Was previous buf put in mpx struct for multi-rsp? */
663 if (!mid->multiRsp) {
664 /* smb buffer will be freed by user thread */
665 if (server->large_buf)
666 server->bigbuf = NULL;
667 else
668 server->smallbuf = NULL;
669 }
ffc00e27 670 dequeue_mid(mid, malformed);
ad69bae1
PS		 671}
672
762dfd10
PS		 673static void clean_demultiplex_info(struct TCP_Server_Info *server)
674{
675 int length;
676
677 /* take it off the list, if it's not already */
678 spin_lock(&cifs_tcp_ses_lock);
679 list_del_init(&server->tcp_ses_list);
680 spin_unlock(&cifs_tcp_ses_lock);
681
682 spin_lock(&GlobalMid_Lock);
683 server->tcpStatus = CifsExiting;
684 spin_unlock(&GlobalMid_Lock);
685 wake_up_all(&server->response_q);
686
2d86dbc9 687 /* check if we have blocked requests that need to free */
fc40f9cf 688 spin_lock(&server->req_lock);
2d86dbc9
PS		 689 if (server->credits <= 0)
690 server->credits = 1;
fc40f9cf 691 spin_unlock(&server->req_lock);
762dfd10
PS		 692 /*
693 * Although there should not be any requests blocked on this queue it
694 * can not hurt to be paranoid and try to wake up requests that may
695 * haven been blocked when more than 50 at time were on the wire to the
696 * same server - they now will see the session is in exit state and get
697 * out of SendReceive.
698 */
699 wake_up_all(&server->request_q);
700 /* give those requests time to exit */
701 msleep(125);
702
703 if (server->ssocket) {
704 sock_release(server->ssocket);
705 server->ssocket = NULL;
706 }
707
708 if (!list_empty(&server->pending_mid_q)) {
709 struct list_head dispose_list;
710 struct mid_q_entry *mid_entry;
711 struct list_head *tmp, *tmp2;
712
713 INIT_LIST_HEAD(&dispose_list);
714 spin_lock(&GlobalMid_Lock);
715 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
716 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 717 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
7c9421e1 718 mid_entry->mid_state = MID_SHUTDOWN;
762dfd10
PS		 719 list_move(&mid_entry->qhead, &dispose_list);
720 }
721 spin_unlock(&GlobalMid_Lock);
722
723 /* now walk dispose list and issue callbacks */
724 list_for_each_safe(tmp, tmp2, &dispose_list) {
725 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 726 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
762dfd10
PS		 727 list_del_init(&mid_entry->qhead);
728 mid_entry->callback(mid_entry);
729 }
730 /* 1/8th of sec is more than enough time for them to exit */
731 msleep(125);
732 }
733
734 if (!list_empty(&server->pending_mid_q)) {
735 /*
736 * mpx threads have not exited yet give them at least the smb
737 * send timeout time for long ops.
738 *
739 * Due to delays on oplock break requests, we need to wait at
740 * least 45 seconds before giving up on a request getting a
741 * response and going ahead and killing cifsd.
742 */
f96637be 743 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
762dfd10
PS		 744 msleep(46000);
745 /*
746 * If threads still have not exited they are probably never
747 * coming home not much else we can do but free the memory.
748 */
749 }
750
751 kfree(server->hostname);
752 kfree(server);
753
754 length = atomic_dec_return(&tcpSesAllocCount);
755 if (length > 0)
11d83360 756 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
762dfd10
PS		 757}
758
e9097ab4
JL		 759static int
760standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
761{
762 int length;
763 char *buf = server->smallbuf;
d4e4854f 764 unsigned int pdu_length = get_rfc1002_length(buf);
e9097ab4
JL		 765
766 /* make sure this will fit in a large buffer */
1887f601 767 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
f96637be 768 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
e9097ab4
JL		 769 cifs_reconnect(server);
770 wake_up(&server->response_q);
3fabaa27 771 return -ECONNABORTED;
e9097ab4
JL		 772 }
773
774 /* switch to large buffer if too big for a small one */
775 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
776 server->large_buf = true;
d4e4854f 777 memcpy(server->bigbuf, buf, server->total_read);
e9097ab4 778 buf = server->bigbuf;
e9097ab4
JL		 779 }
780
781 /* now read the rest */
1887f601
PS		 782 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
783 pdu_length - HEADER_SIZE(server) + 1 + 4);
e9097ab4
JL		 784 if (length < 0)
785 return length;
786 server->total_read += length;
787
d4e4854f 788 dump_smb(buf, server->total_read);
e9097ab4
JL		 789
790 /*
791 * We know that we received enough to get to the MID as we
792 * checked the pdu_length earlier. Now check to see
793 * if the rest of the header is OK. We borrow the length
794 * var for the rest of the loop to avoid a new stack var.
795 *
796 * 48 bytes is enough to display the header and a little bit
797 * into the payload for debugging purposes.
798 */
373512ec 799 length = server->ops->check_message(buf, server->total_read, server);
e9097ab4
JL		 800 if (length != 0)
801 cifs_dump_mem("Bad SMB: ", buf,
802 min_t(unsigned int, server->total_read, 48));
803
2e44b288
PS		 804 if (server->ops->is_status_pending &&
805 server->ops->is_status_pending(buf, server, length))
806 return -1;
807
ff4fa4a2
JL		 808 if (!mid)
809 return length;
e9097ab4 810
d4e4854f 811 handle_mid(mid, server, buf, length);
ff4fa4a2 812 return 0;
e9097ab4
JL		 813}
814
1da177e4 815static int
7c97c200 816cifs_demultiplex_thread(void *p)
1da177e4
LT		 817{
818 int length;
7c97c200 819 struct TCP_Server_Info *server = p;
2a37ef94
JL		 820 unsigned int pdu_length;
821 char *buf = NULL;
a5c3e1c7 822 struct task_struct *task_to_wake = NULL;
1da177e4 823 struct mid_q_entry *mid_entry;
1da177e4 824
1da177e4 825 current->flags |= PF_MEMALLOC;
f96637be 826 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
93d0ec85
JL		 827
828 length = atomic_inc_return(&tcpSesAllocCount);
829 if (length > 1)
11d83360 830 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1da177e4 831
83144186 832 set_freezable();
469ee614 833 while (server->tcpStatus != CifsExiting) {
ede1327e
SF		 834 if (try_to_freeze())
835 continue;
b8643e1b 836
2a37ef94 837 if (!allocate_buffers(server))
3d9c2472 838 continue;
b8643e1b 839
2a37ef94 840 server->large_buf = false;
2a37ef94 841 buf = server->smallbuf;
f01d5e14 842 pdu_length = 4; /* enough to get RFC1001 header */
fda35943 843
e28bc5b1 844 length = cifs_read_from_socket(server, buf, pdu_length);
a52c1eb7 845 if (length < 0)
1da177e4 846 continue;
2a37ef94 847 server->total_read = length;
1da177e4 848
98bac62c
PS		 849 /*
850 * The right amount was read from socket - 4 bytes,
851 * so we can now interpret the length field.
852 */
d4e4854f 853 pdu_length = get_rfc1002_length(buf);
70ca734a 854
f96637be 855 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
fe11e4cc 856 if (!is_smb_response(server, buf[0]))
fb8c4b14 857 continue;
e4eb295d 858
89482a56 859 /* make sure we have enough to get to the MID */
1887f601 860 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
f96637be
JP		 861 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
862 pdu_length);
89482a56
JL		 863 cifs_reconnect(server);
864 wake_up(&server->response_q);
865 continue;
e4eb295d 866 }
e7015fb1 867
89482a56 868 /* read down to the MID */
e28bc5b1 869 length = cifs_read_from_socket(server, buf + 4,
1887f601 870 HEADER_SIZE(server) - 1 - 4);
89482a56 871 if (length < 0)
e4eb295d 872 continue;
2a37ef94 873 server->total_read += length;
1da177e4 874
8aa26f3e 875 mid_entry = server->ops->find_mid(server, buf);
50c2f753 876
44d22d84
JL		 877 if (!mid_entry || !mid_entry->receive)
878 length = standard_receive3(server, mid_entry);
879 else
880 length = mid_entry->receive(server, mid_entry);
71823baf 881
e9097ab4 882 if (length < 0)
fe11e4cc 883 continue;
1da177e4 884
d4e4854f 885 if (server->large_buf)
2a37ef94 886 buf = server->bigbuf;
fda35943 887
fda35943 888 server->lstrp = jiffies;
2b84a36c 889 if (mid_entry != NULL) {
2a37ef94
JL		 890 if (!mid_entry->multiRsp || mid_entry->multiEnd)
891 mid_entry->callback(mid_entry);
7f0adb53
PS		 892 } else if (!server->ops->is_oplock_break ||
893 !server->ops->is_oplock_break(buf, server)) {
f96637be
JP		 894 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
895 atomic_read(&midCount));
1887f601
PS		 896 cifs_dump_mem("Received Data is: ", buf,
897 HEADER_SIZE(server));
3979877e 898#ifdef CONFIG_CIFS_DEBUG2
7f0adb53
PS		 899 if (server->ops->dump_detail)
900 server->ops->dump_detail(buf);
3979877e
SF		 901 cifs_dump_mids(server);
902#endif /* CIFS_DEBUG2 */
50c2f753 903
e4eb295d
SF		 904 }
905 } /* end while !EXITING */
906
fd62cb7e 907 /* buffer usually freed in free_mid - need to free it here on exit */
2a37ef94
JL		 908 cifs_buf_release(server->bigbuf);
909 if (server->smallbuf) /* no sense logging a debug message if NULL */
910 cifs_small_buf_release(server->smallbuf);
1da177e4 911
a5c3e1c7 912 task_to_wake = xchg(&server->tsk, NULL);
762dfd10 913 clean_demultiplex_info(server);
a5c3e1c7
SF		 914
915 /* if server->tsk was NULL then wait for a signal before exiting */
916 if (!task_to_wake) {
917 set_current_state(TASK_INTERRUPTIBLE);
918 while (!signal_pending(current)) {
919 schedule();
920 set_current_state(TASK_INTERRUPTIBLE);
921 }
922 set_current_state(TASK_RUNNING);
923 }
924
0468a2cf 925 module_put_and_exit(0);
1da177e4
LT		 926}
927
c359cf3c
JL		 928/* extract the host portion of the UNC string */
929static char *
930extract_hostname(const char *unc)
931{
932 const char *src;
933 char *dst, *delim;
934 unsigned int len;
935
936 /* skip double chars at beginning of string */
937 /* BB: check validity of these bytes? */
938 src = unc + 2;
939
940 /* delimiter between hostname and sharename is always '\\' now */
941 delim = strchr(src, '\\');
942 if (!delim)
943 return ERR_PTR(-EINVAL);
944
945 len = delim - src;
946 dst = kmalloc((len + 1), GFP_KERNEL);
947 if (dst == NULL)
948 return ERR_PTR(-ENOMEM);
949
950 memcpy(dst, src, len);
951 dst[len] = '\0';
952
953 return dst;
954}
955
8830d7e0
SP		 956static int get_option_ul(substring_t args[], unsigned long *option)
957{
958 int rc;
959 char *string;
960
961 string = match_strdup(args);
962 if (string == NULL)
963 return -ENOMEM;
bfa890a3 964 rc = kstrtoul(string, 0, option);
8830d7e0
SP		 965 kfree(string);
966
967 return rc;
968}
969
3da46565
EB		 970static int get_option_uid(substring_t args[], kuid_t *result)
971{
972 unsigned long value;
973 kuid_t uid;
974 int rc;
975
976 rc = get_option_ul(args, &value);
977 if (rc)
978 return rc;
979
980 uid = make_kuid(current_user_ns(), value);
981 if (!uid_valid(uid))
982 return -EINVAL;
983
984 *result = uid;
985 return 0;
986}
987
988static int get_option_gid(substring_t args[], kgid_t *result)
989{
990 unsigned long value;
991 kgid_t gid;
992 int rc;
993
994 rc = get_option_ul(args, &value);
995 if (rc)
996 return rc;
997
998 gid = make_kgid(current_user_ns(), value);
999 if (!gid_valid(gid))
1000 return -EINVAL;
1001
1002 *result = gid;
1003 return 0;
1004}
8830d7e0
SP		 1005
1006static int cifs_parse_security_flavors(char *value,
1007 struct smb_vol *vol)
1008{
1009
1010 substring_t args[MAX_OPT_ARGS];
1011
1e3cc57e
JL		 1012 /*
1013 * With mount options, the last one should win. Reset any existing
1014 * settings back to default.
1015 */
1016 vol->sectype = Unspecified;
1017 vol->sign = false;
1018
8830d7e0 1019 switch (match_token(value, cifs_secflavor_tokens, args)) {
3f618223
JL		 1020 case Opt_sec_krb5p:
1021 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1022 return 1;
1023 case Opt_sec_krb5i:
1024 vol->sign = true;
1025 /* Fallthrough */
8830d7e0 1026 case Opt_sec_krb5:
1e3cc57e 1027 vol->sectype = Kerberos;
8830d7e0 1028 break;
3f618223 1029 case Opt_sec_ntlmsspi:
1e3cc57e 1030 vol->sign = true;
3f618223 1031 /* Fallthrough */
8830d7e0 1032 case Opt_sec_ntlmssp:
1e3cc57e 1033 vol->sectype = RawNTLMSSP;
8830d7e0 1034 break;
3f618223 1035 case Opt_sec_ntlmi:
1e3cc57e 1036 vol->sign = true;
3f618223 1037 /* Fallthrough */
8830d7e0 1038 case Opt_ntlm:
1e3cc57e 1039 vol->sectype = NTLM;
8830d7e0 1040 break;
3f618223 1041 case Opt_sec_ntlmv2i:
1e3cc57e 1042 vol->sign = true;
3f618223 1043 /* Fallthrough */
7659624f 1044 case Opt_sec_ntlmv2:
1e3cc57e 1045 vol->sectype = NTLMv2;
8830d7e0
SP		 1046 break;
1047#ifdef CONFIG_CIFS_WEAK_PW_HASH
1048 case Opt_sec_lanman:
1e3cc57e 1049 vol->sectype = LANMAN;
8830d7e0
SP		 1050 break;
1051#endif
1052 case Opt_sec_none:
1053 vol->nullauth = 1;
1054 break;
1055 default:
f96637be 1056 cifs_dbg(VFS, "bad security option: %s\n", value);
8830d7e0
SP		 1057 return 1;
1058 }
1059
1060 return 0;
1061}
1062
15b6a473
JL		 1063static int
1064cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1065{
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1069 case Opt_cache_loose:
1070 vol->direct_io = false;
1071 vol->strict_io = false;
1072 break;
1073 case Opt_cache_strict:
1074 vol->direct_io = false;
1075 vol->strict_io = true;
1076 break;
1077 case Opt_cache_none:
1078 vol->direct_io = true;
1079 vol->strict_io = false;
1080 break;
1081 default:
f96637be 1082 cifs_dbg(VFS, "bad cache= option: %s\n", value);
15b6a473
JL		 1083 return 1;
1084 }
1085 return 0;
1086}
1087
23db65f5
JL		 1088static int
1089cifs_parse_smb_version(char *value, struct smb_vol *vol)
1090{
1091 substring_t args[MAX_OPT_ARGS];
1092
1093 switch (match_token(value, cifs_smb_version_tokens, args)) {
1094 case Smb_1:
1095 vol->ops = &smb1_operations;
1096 vol->vals = &smb1_values;
1097 break;
1080ef75 1098#ifdef CONFIG_CIFS_SMB2
dd446b16 1099 case Smb_20:
53ef1016 1100 vol->ops = &smb20_operations;
dd446b16
SF		 1101 vol->vals = &smb20_values;
1102 break;
1080ef75
SF		 1103 case Smb_21:
1104 vol->ops = &smb21_operations;
1105 vol->vals = &smb21_values;
1106 break;
e4aa25e7 1107 case Smb_30:
38107d45 1108 vol->ops = &smb30_operations;
e4aa25e7
SF		 1109 vol->vals = &smb30_values;
1110 break;
20b6d8b4
SF		 1111 case Smb_302:
1112 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1113 vol->vals = &smb302_values;
1114 break;
5f7fbf73
SF		 1115#ifdef CONFIG_CIFS_SMB311
1116 case Smb_311:
aab1893d 1117 vol->ops = &smb311_operations;
5f7fbf73
SF		 1118 vol->vals = &smb311_values;
1119 break;
1120#endif /* SMB311 */
1080ef75 1121#endif
23db65f5 1122 default:
f96637be 1123 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
23db65f5
JL		 1124 return 1;
1125 }
1126 return 0;
1127}
1128
d387a5c5
JL		 1129/*
1130 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1131 * fields with the result. Returns 0 on success and an error otherwise.
1132 */
1133static int
1134cifs_parse_devname(const char *devname, struct smb_vol *vol)
1135{
1136 char *pos;
1137 const char *delims = "/\\";
1138 size_t len;
1139
1140 /* make sure we have a valid UNC double delimiter prefix */
1141 len = strspn(devname, delims);
1142 if (len != 2)
1143 return -EINVAL;
1144
1145 /* find delimiter between host and sharename */
1146 pos = strpbrk(devname + 2, delims);
1147 if (!pos)
1148 return -EINVAL;
1149
1150 /* skip past delimiter */
1151 ++pos;
1152
1153 /* now go until next delimiter or end of string */
1154 len = strcspn(pos, delims);
1155
1156 /* move "pos" up to delimiter or NULL */
1157 pos += len;
1158 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1159 if (!vol->UNC)
1160 return -ENOMEM;
1161
1162 convert_delimiter(vol->UNC, '\\');
1163
11e31647
SP		 1164 /* skip any delimiter */
1165 if (*pos == '/' || *pos == '\\')
1166 pos++;
1167
1168 /* If pos is NULL then no prepath */
1169 if (!*pos)
d387a5c5
JL		 1170 return 0;
1171
1172 vol->prepath = kstrdup(pos, GFP_KERNEL);
1173 if (!vol->prepath)
1174 return -ENOMEM;
1175
1176 return 0;
1177}
1178
1da177e4 1179static int
b946845a 1180cifs_parse_mount_options(const char *mountdata, const char *devname,
50c2f753 1181 struct smb_vol *vol)
1da177e4 1182{
8830d7e0 1183 char *data, *end;
957df453 1184 char *mountdata_copy = NULL, *options;
1da177e4
LT		 1185 unsigned int temp_len, i, j;
1186 char separator[2];
9b9d6b24
JL		 1187 short int override_uid = -1;
1188 short int override_gid = -1;
1189 bool uid_specified = false;
1190 bool gid_specified = false;
d8162558
JL		 1191 bool sloppy = false;
1192 char *invalid = NULL;
88463999 1193 char *nodename = utsname()->nodename;
8830d7e0
SP		 1194 char *string = NULL;
1195 char *tmp_end, *value;
1196 char delim;
b979aaa1
JL		 1197 bool got_ip = false;
1198 unsigned short port = 0;
1199 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1da177e4
LT		 1200
1201 separator[0] = ',';
50c2f753 1202 separator[1] = 0;
8830d7e0 1203 delim = separator[0];
1da177e4 1204
6ee9542a
JL		 1205 /* ensure we always start with zeroed-out smb_vol */
1206 memset(vol, 0, sizeof(*vol));
1207
88463999
JL		 1208 /*
1209 * does not have to be perfect mapping since field is
1210 * informational, only used for servers that do not support
1211 * port 445 and it can be overridden at mount time
1212 */
1397f2ee
JL		 1213 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1214 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
88463999
JL		 1215 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1216
1397f2ee 1217 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
a10faeb2
SF		 1218 /* null target name indicates to use *SMBSERVR default called name
1219 if we end up sending RFC1001 session initialize */
1220 vol->target_rfc1001_name[0] = 0;
3e4b3e1f
JL		 1221 vol->cred_uid = current_uid();
1222 vol->linux_uid = current_uid();
a001e5b5 1223 vol->linux_gid = current_gid();
f55ed1a8 1224
2baa2682
SF		 1225 /*
1226 * default to SFM style remapping of seven reserved characters
1227 * unless user overrides it or we negotiate CIFS POSIX where
1228 * it is unnecessary. Can not simultaneously use more than one mapping
1229 * since then readdir could list files that open could not open
1230 */
1231 vol->remap = true;
1232
f55ed1a8
JL		 1233 /* default to only allowing write access to owner of the mount */
1234 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1da177e4
LT		 1235
1236 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
ac67055e
JA		 1237 /* default is always to request posix paths. */
1238 vol->posix_paths = 1;
a0c9217f
JL		 1239 /* default to using server inode numbers where available */
1240 vol->server_ino = 1;
ac67055e 1241
1b359204
JL		 1242 /* default is to use strict cifs caching semantics */
1243 vol->strict_io = true;
1244
6d20e840
SJ		 1245 vol->actimeo = CIFS_DEF_ACTIMEO;
1246
23db65f5
JL		 1247 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1248 vol->ops = &smb1_operations;
1249 vol->vals = &smb1_values;
1250
b782fcc1
RV		 1251 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1252
b946845a
SF		 1253 if (!mountdata)
1254 goto cifs_parse_mount_err;
1255
1256 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1257 if (!mountdata_copy)
1258 goto cifs_parse_mount_err;
1da177e4 1259
b946845a 1260 options = mountdata_copy;
4906e50b 1261 end = options + strlen(options);
8830d7e0 1262
50c2f753 1263 if (strncmp(options, "sep=", 4) == 0) {
fb8c4b14 1264 if (options[4] != 0) {
1da177e4
LT		 1265 separator[0] = options[4];
1266 options += 5;
1267 } else {
f96637be 1268 cifs_dbg(FYI, "Null separator not allowed\n");
1da177e4
LT		 1269 }
1270 }
3d3ea8e6
SP		 1271 vol->backupuid_specified = false; /* no backup intent for a user */
1272 vol->backupgid_specified = false; /* no backup intent for a group */
50c2f753 1273
37d4f99b
JL		 1274 switch (cifs_parse_devname(devname, vol)) {
1275 case 0:
1276 break;
1277 case -ENOMEM:
1278 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1279 goto cifs_parse_mount_err;
1280 case -EINVAL:
1281 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1282 goto cifs_parse_mount_err;
1283 default:
1284 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1285 goto cifs_parse_mount_err;
d387a5c5
JL		 1286 }
1287
1da177e4 1288 while ((data = strsep(&options, separator)) != NULL) {
8830d7e0
SP		 1289 substring_t args[MAX_OPT_ARGS];
1290 unsigned long option;
1291 int token;
1292
1da177e4
LT		 1293 if (!*data)
1294 continue;
1da177e4 1295
8830d7e0
SP		 1296 token = match_token(data, cifs_mount_option_tokens, args);
1297
1298 switch (token) {
1299
1300 /* Ingnore the following */
1301 case Opt_ignore:
1302 break;
1303
1304 /* Boolean values */
1305 case Opt_user_xattr:
1da177e4 1306 vol->no_xattr = 0;
8830d7e0
SP		 1307 break;
1308 case Opt_nouser_xattr:
1da177e4 1309 vol->no_xattr = 1;
8830d7e0
SP		 1310 break;
1311 case Opt_forceuid:
9b9d6b24 1312 override_uid = 1;
8830d7e0
SP		 1313 break;
1314 case Opt_noforceuid:
9b9d6b24 1315 override_uid = 0;
8830d7e0 1316 break;
72bd481f
JL		 1317 case Opt_forcegid:
1318 override_gid = 1;
1319 break;
1320 case Opt_noforcegid:
1321 override_gid = 0;
1322 break;
8830d7e0 1323 case Opt_noblocksend:
edf1ae40 1324 vol->noblocksnd = 1;
8830d7e0
SP		 1325 break;
1326 case Opt_noautotune:
edf1ae40 1327 vol->noautotune = 1;
8830d7e0
SP		 1328 break;
1329 case Opt_hard:
1da177e4 1330 vol->retry = 1;
8830d7e0
SP		 1331 break;
1332 case Opt_soft:
1da177e4 1333 vol->retry = 0;
8830d7e0
SP		 1334 break;
1335 case Opt_perm:
1da177e4 1336 vol->noperm = 0;
8830d7e0
SP		 1337 break;
1338 case Opt_noperm:
1da177e4 1339 vol->noperm = 1;
8830d7e0
SP		 1340 break;
1341 case Opt_mapchars:
2baa2682
SF		 1342 vol->sfu_remap = true;
1343 vol->remap = false; /* disable SFM mapping */
8830d7e0
SP		 1344 break;
1345 case Opt_nomapchars:
2baa2682
SF		 1346 vol->sfu_remap = false;
1347 break;
1348 case Opt_mapposix:
1349 vol->remap = true;
1350 vol->sfu_remap = false; /* disable SFU mapping */
1351 break;
1352 case Opt_nomapposix:
1353 vol->remap = false;
8830d7e0
SP		 1354 break;
1355 case Opt_sfu:
50c2f753 1356 vol->sfu_emul = 1;
8830d7e0
SP		 1357 break;
1358 case Opt_nosfu:
50c2f753 1359 vol->sfu_emul = 0;
8830d7e0
SP		 1360 break;
1361 case Opt_nodfs:
2c1b8615 1362 vol->nodfs = 1;
8830d7e0
SP		 1363 break;
1364 case Opt_posixpaths:
ac67055e 1365 vol->posix_paths = 1;
8830d7e0
SP		 1366 break;
1367 case Opt_noposixpaths:
ac67055e 1368 vol->posix_paths = 0;
8830d7e0
SP		 1369 break;
1370 case Opt_nounix:
c18c842b 1371 vol->no_linux_ext = 1;
8830d7e0
SP		 1372 break;
1373 case Opt_nocase:
50c2f753 1374 vol->nocase = 1;
8830d7e0
SP		 1375 break;
1376 case Opt_brl:
c46fa8ac 1377 vol->nobrl = 0;
8830d7e0
SP		 1378 break;
1379 case Opt_nobrl:
c46fa8ac 1380 vol->nobrl = 1;
5cfdddcf
PS		 1381 /*
1382 * turn off mandatory locking in mode
8830d7e0 1383 * if remote locking is turned off since the
5cfdddcf
PS		 1384 * local vfs will do advisory
1385 */
50c2f753
SF		 1386 if (vol->file_mode ==
1387 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
d3485d37 1388 vol->file_mode = S_IALLUGO;
8830d7e0
SP		 1389 break;
1390 case Opt_forcemandatorylock:
13a6e42a 1391 vol->mand_lock = 1;
8830d7e0
SP		 1392 break;
1393 case Opt_setuids:
1da177e4 1394 vol->setuids = 1;
8830d7e0
SP		 1395 break;
1396 case Opt_nosetuids:
1da177e4 1397 vol->setuids = 0;
8830d7e0 1398 break;
95932655
SF		 1399 case Opt_setuidfromacl:
1400 vol->setuidfromacl = 1;
1401 break;
8830d7e0 1402 case Opt_dynperm:
d0a9c078 1403 vol->dynperm = true;
8830d7e0
SP		 1404 break;
1405 case Opt_nodynperm:
d0a9c078 1406 vol->dynperm = false;
8830d7e0
SP		 1407 break;
1408 case Opt_nohard:
1da177e4 1409 vol->retry = 0;
8830d7e0
SP		 1410 break;
1411 case Opt_nosoft:
1da177e4 1412 vol->retry = 1;
8830d7e0
SP		 1413 break;
1414 case Opt_nointr:
1da177e4 1415 vol->intr = 0;
8830d7e0
SP		 1416 break;
1417 case Opt_intr:
1da177e4 1418 vol->intr = 1;
8830d7e0
SP		 1419 break;
1420 case Opt_nostrictsync:
be652445 1421 vol->nostrictsync = 1;
8830d7e0
SP		 1422 break;
1423 case Opt_strictsync:
be652445 1424 vol->nostrictsync = 0;
8830d7e0
SP		 1425 break;
1426 case Opt_serverino:
1da177e4 1427 vol->server_ino = 1;
8830d7e0
SP		 1428 break;
1429 case Opt_noserverino:
1da177e4 1430 vol->server_ino = 0;
8830d7e0
SP		 1431 break;
1432 case Opt_rwpidforward:
d4ffff1f 1433 vol->rwpidforward = 1;
8830d7e0
SP		 1434 break;
1435 case Opt_cifsacl:
0a4b92c0 1436 vol->cifs_acl = 1;
8830d7e0
SP		 1437 break;
1438 case Opt_nocifsacl:
0a4b92c0 1439 vol->cifs_acl = 0;
8830d7e0
SP		 1440 break;
1441 case Opt_acl:
1da177e4 1442 vol->no_psx_acl = 0;
8830d7e0
SP		 1443 break;
1444 case Opt_noacl:
1da177e4 1445 vol->no_psx_acl = 1;
8830d7e0
SP		 1446 break;
1447 case Opt_locallease:
84210e91 1448 vol->local_lease = 1;
8830d7e0
SP		 1449 break;
1450 case Opt_sign:
1e3cc57e 1451 vol->sign = true;
8830d7e0
SP		 1452 break;
1453 case Opt_seal:
95b1cb90 1454 /* we do not do the following in secFlags because seal
8830d7e0
SP		 1455 * is a per tree connection (mount) not a per socket
1456 * or per-smb connection option in the protocol
1457 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1458 */
95b1cb90 1459 vol->seal = 1;
8830d7e0 1460 break;
8830d7e0 1461 case Opt_noac:
0b456f04 1462 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
8830d7e0
SP		 1463 break;
1464 case Opt_fsc:
607a569d 1465#ifndef CONFIG_CIFS_FSCACHE
f96637be 1466 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
b946845a 1467 goto cifs_parse_mount_err;
607a569d 1468#endif
fa1df75d 1469 vol->fsc = true;
8830d7e0
SP		 1470 break;
1471 case Opt_mfsymlinks:
736a3320 1472 vol->mfsymlinks = true;
8830d7e0
SP		 1473 break;
1474 case Opt_multiuser:
0eb8a132 1475 vol->multiuser = true;
8830d7e0 1476 break;
d8162558
JL		 1477 case Opt_sloppy:
1478 sloppy = true;
1479 break;
a0b3df5c
JL		 1480 case Opt_nosharesock:
1481 vol->nosharesock = true;
1482 break;
b2a30774
SF		 1483 case Opt_nopersistent:
1484 vol->nopersistent = true;
1485 if (vol->persistent) {
1486 cifs_dbg(VFS,
1487 "persistenthandles mount options conflict\n");
1488 goto cifs_parse_mount_err;
1489 }
1490 break;
1491 case Opt_persistent:
1492 vol->persistent = true;
592fafe6 1493 if ((vol->nopersistent) || (vol->resilient)) {
b2a30774
SF		 1494 cifs_dbg(VFS,
1495 "persistenthandles mount options conflict\n");
1496 goto cifs_parse_mount_err;
1497 }
1498 break;
592fafe6
SF		 1499 case Opt_resilient:
1500 vol->resilient = true;
1501 if (vol->persistent) {
1502 cifs_dbg(VFS,
1503 "persistenthandles mount options conflict\n");
1504 goto cifs_parse_mount_err;
1505 }
1506 break;
1507 case Opt_noresilient:
1508 vol->resilient = false; /* already the default */
1509 break;
39566443
GP		 1510 case Opt_domainauto:
1511 vol->domainauto = true;
1512 break;
8830d7e0
SP		 1513
1514 /* Numeric Values */
1515 case Opt_backupuid:
3da46565 1516 if (get_option_uid(args, &vol->backupuid)) {
f96637be
JP		 1517 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1518 __func__);
3d3ea8e6
SP		 1519 goto cifs_parse_mount_err;
1520 }
1521 vol->backupuid_specified = true;
8830d7e0
SP		 1522 break;
1523 case Opt_backupgid:
3da46565 1524 if (get_option_gid(args, &vol->backupgid)) {
f96637be
JP		 1525 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1526 __func__);
3d3ea8e6
SP		 1527 goto cifs_parse_mount_err;
1528 }
1529 vol->backupgid_specified = true;
8830d7e0
SP		 1530 break;
1531 case Opt_uid:
3da46565 1532 if (get_option_uid(args, &vol->linux_uid)) {
f96637be
JP		 1533 cifs_dbg(VFS, "%s: Invalid uid value\n",
1534 __func__);
8830d7e0
SP		 1535 goto cifs_parse_mount_err;
1536 }
8830d7e0
SP		 1537 uid_specified = true;
1538 break;
1539 case Opt_cruid:
3da46565 1540 if (get_option_uid(args, &vol->cred_uid)) {
f96637be
JP		 1541 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1542 __func__);
8830d7e0
SP		 1543 goto cifs_parse_mount_err;
1544 }
8830d7e0
SP		 1545 break;
1546 case Opt_gid:
3da46565 1547 if (get_option_gid(args, &vol->linux_gid)) {
f96637be
JP		 1548 cifs_dbg(VFS, "%s: Invalid gid value\n",
1549 __func__);
8830d7e0
SP		 1550 goto cifs_parse_mount_err;
1551 }
8830d7e0
SP		 1552 gid_specified = true;
1553 break;
1554 case Opt_file_mode:
1555 if (get_option_ul(args, &option)) {
f96637be
JP		 1556 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1557 __func__);
8830d7e0
SP		 1558 goto cifs_parse_mount_err;
1559 }
1560 vol->file_mode = option;
1561 break;
1562 case Opt_dirmode:
1563 if (get_option_ul(args, &option)) {
f96637be
JP		 1564 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1565 __func__);
8830d7e0
SP		 1566 goto cifs_parse_mount_err;
1567 }
1568 vol->dir_mode = option;
1569 break;
1570 case Opt_port:
b979aaa1
JL		 1571 if (get_option_ul(args, &option) ||
1572 option > USHRT_MAX) {
f96637be
JP		 1573 cifs_dbg(VFS, "%s: Invalid port value\n",
1574 __func__);
8830d7e0
SP		 1575 goto cifs_parse_mount_err;
1576 }
b979aaa1 1577 port = (unsigned short)option;
8830d7e0
SP		 1578 break;
1579 case Opt_rsize:
1580 if (get_option_ul(args, &option)) {
f96637be
JP		 1581 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1582 __func__);
b946845a 1583 goto cifs_parse_mount_err;
8830d7e0
SP		 1584 }
1585 vol->rsize = option;
1586 break;
1587 case Opt_wsize:
1588 if (get_option_ul(args, &option)) {
f96637be
JP		 1589 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1590 __func__);
8830d7e0
SP		 1591 goto cifs_parse_mount_err;
1592 }
1593 vol->wsize = option;
1594 break;
1595 case Opt_actimeo:
1596 if (get_option_ul(args, &option)) {
f96637be
JP		 1597 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1598 __func__);
8830d7e0
SP		 1599 goto cifs_parse_mount_err;
1600 }
1601 vol->actimeo = HZ * option;
1602 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
f96637be 1603 cifs_dbg(VFS, "attribute cache timeout too large\n");
8830d7e0
SP		 1604 goto cifs_parse_mount_err;
1605 }
1606 break;
adfeb3e0
SF		 1607 case Opt_echo_interval:
1608 if (get_option_ul(args, &option)) {
1609 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1610 __func__);
1611 goto cifs_parse_mount_err;
1612 }
1613 vol->echo_interval = option;
1614 break;
8b217fe7
SF		 1615 case Opt_snapshot:
1616 if (get_option_ul(args, &option)) {
1617 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1618 __func__);
1619 goto cifs_parse_mount_err;
1620 }
1621 vol->snapshot_time = option;
1622 break;
141891f4
SF		 1623 case Opt_max_credits:
1624 if (get_option_ul(args, &option) || (option < 20) ||
1625 (option > 60000)) {
1626 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1627 __func__);
1628 goto cifs_parse_mount_err;
1629 }
1630 vol->max_credits = option;
1631 break;
8830d7e0
SP		 1632
1633 /* String Arguments */
1634
4fe9e963
SP		 1635 case Opt_blank_user:
1636 /* null user, ie. anonymous authentication */
1637 vol->nullauth = 1;
1638 vol->username = NULL;
1639 break;
8830d7e0
SP		 1640 case Opt_user:
1641 string = match_strdup(args);
1642 if (string == NULL)
1643 goto out_nomem;
1644
8c3a2b4c
SL		 1645 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1646 CIFS_MAX_USERNAME_LEN) {
0b456f04 1647 pr_warn("CIFS: username too long\n");
8830d7e0
SP		 1648 goto cifs_parse_mount_err;
1649 }
2bd50fb3
TK		 1650
1651 kfree(vol->username);
8830d7e0 1652 vol->username = kstrdup(string, GFP_KERNEL);
f96637be 1653 if (!vol->username)
8830d7e0 1654 goto cifs_parse_mount_err;
8830d7e0
SP		 1655 break;
1656 case Opt_blank_pass:
8830d7e0
SP		 1657 /* passwords have to be handled differently
1658 * to allow the character used for deliminator
1659 * to be passed within them
1660 */
1661
c369c9a4
SP		 1662 /*
1663 * Check if this is a case where the password
1664 * starts with a delimiter
1665 */
1666 tmp_end = strchr(data, '=');
1667 tmp_end++;
1668 if (!(tmp_end < end && tmp_end[1] == delim)) {
1669 /* No it is not. Set the password to NULL */
d6ccf499 1670 kfree(vol->password);
c369c9a4
SP		 1671 vol->password = NULL;
1672 break;
1673 }
1674 /* Yes it is. Drop down to Opt_pass below.*/
1675 case Opt_pass:
8830d7e0
SP		 1676 /* Obtain the value string */
1677 value = strchr(data, '=');
10238074 1678 value++;
8830d7e0
SP		 1679
1680 /* Set tmp_end to end of the string */
1681 tmp_end = (char *) value + strlen(value);
1682
1683 /* Check if following character is the deliminator
1684 * If yes, we have encountered a double deliminator
1685 * reset the NULL character to the deliminator
1686 */
e73f843a 1687 if (tmp_end < end && tmp_end[1] == delim) {
8830d7e0
SP		 1688 tmp_end[0] = delim;
1689
e73f843a
SJ		 1690 /* Keep iterating until we get to a single
1691 * deliminator OR the end
1692 */
1693 while ((tmp_end = strchr(tmp_end, delim))
1694 != NULL && (tmp_end[1] == delim)) {
1695 tmp_end = (char *) &tmp_end[2];
1696 }
1697
1698 /* Reset var options to point to next element */
1699 if (tmp_end) {
1700 tmp_end[0] = '\0';
1701 options = (char *) &tmp_end[1];
1702 } else
1703 /* Reached the end of the mount option
1704 * string */
1705 options = end;
8830d7e0
SP		 1706 }
1707
d6ccf499 1708 kfree(vol->password);
8830d7e0
SP		 1709 /* Now build new password string */
1710 temp_len = strlen(value);
1711 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1712 if (vol->password == NULL) {
0b456f04 1713 pr_warn("CIFS: no memory for password\n");
8830d7e0
SP		 1714 goto cifs_parse_mount_err;
1715 }
1716
1717 for (i = 0, j = 0; i < temp_len; i++, j++) {
1718 vol->password[j] = value[i];
1719 if ((value[i] == delim) &&
1720 value[i+1] == delim)
1721 /* skip the second deliminator */
1722 i++;
1723 }
1724 vol->password[j] = '\0';
1725 break;
4fe9e963 1726 case Opt_blank_ip:
b979aaa1
JL		 1727 /* FIXME: should this be an error instead? */
1728 got_ip = false;
4fe9e963 1729 break;
8830d7e0
SP		 1730 case Opt_ip:
1731 string = match_strdup(args);
1732 if (string == NULL)
1733 goto out_nomem;
1734
b979aaa1
JL		 1735 if (!cifs_convert_address(dstaddr, string,
1736 strlen(string))) {
0b456f04 1737 pr_err("CIFS: bad ip= option (%s).\n", string);
8830d7e0
SP		 1738 goto cifs_parse_mount_err;
1739 }
b979aaa1 1740 got_ip = true;
8830d7e0 1741 break;
8830d7e0
SP		 1742 case Opt_domain:
1743 string = match_strdup(args);
1744 if (string == NULL)
1745 goto out_nomem;
1746
057d6332
CG		 1747 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1748 == CIFS_MAX_DOMAINNAME_LEN) {
0b456f04 1749 pr_warn("CIFS: domain name too long\n");
8830d7e0
SP		 1750 goto cifs_parse_mount_err;
1751 }
1752
2bd50fb3 1753 kfree(vol->domainname);
8830d7e0
SP		 1754 vol->domainname = kstrdup(string, GFP_KERNEL);
1755 if (!vol->domainname) {
0b456f04 1756 pr_warn("CIFS: no memory for domainname\n");
8830d7e0
SP		 1757 goto cifs_parse_mount_err;
1758 }
f96637be 1759 cifs_dbg(FYI, "Domain name set\n");
8830d7e0
SP		 1760 break;
1761 case Opt_srcaddr:
1762 string = match_strdup(args);
1763 if (string == NULL)
1764 goto out_nomem;
1765
4fe9e963 1766 if (!cifs_convert_address(
8830d7e0
SP		 1767 (struct sockaddr *)&vol->srcaddr,
1768 string, strlen(string))) {
0b456f04
AS		 1769 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1770 string);
8830d7e0
SP		 1771 goto cifs_parse_mount_err;
1772 }
1773 break;
8830d7e0
SP		 1774 case Opt_iocharset:
1775 string = match_strdup(args);
1776 if (string == NULL)
1777 goto out_nomem;
1778
4fe9e963 1779 if (strnlen(string, 1024) >= 65) {
0b456f04 1780 pr_warn("CIFS: iocharset name too long.\n");
8830d7e0
SP		 1781 goto cifs_parse_mount_err;
1782 }
1783
87e747cd 1784 if (strncasecmp(string, "default", 7) != 0) {
2bd50fb3 1785 kfree(vol->iocharset);
8830d7e0
SP		 1786 vol->iocharset = kstrdup(string,
1787 GFP_KERNEL);
1788 if (!vol->iocharset) {
0b456f04 1789 pr_warn("CIFS: no memory for charset\n");
8830d7e0
SP		 1790 goto cifs_parse_mount_err;
1791 }
1792 }
1793 /* if iocharset not set then load_nls_default
1794 * is used by caller
1795 */
f96637be 1796 cifs_dbg(FYI, "iocharset set to %s\n", string);
8830d7e0 1797 break;
8830d7e0
SP		 1798 case Opt_netbiosname:
1799 string = match_strdup(args);
1800 if (string == NULL)
1801 goto out_nomem;
1802
8830d7e0
SP		 1803 memset(vol->source_rfc1001_name, 0x20,
1804 RFC1001_NAME_LEN);
1805 /*
1806 * FIXME: are there cases in which a comma can
1807 * be valid in workstation netbios name (and
1808 * need special handling)?
1809 */
1810 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1811 /* don't ucase netbiosname for user */
1812 if (string[i] == 0)
1813 break;
1814 vol->source_rfc1001_name[i] = string[i];
1815 }
1816 /* The string has 16th byte zero still from
1817 * set at top of the function
1818 */
1819 if (i == RFC1001_NAME_LEN && string[i] != 0)
0b456f04 1820 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
8830d7e0
SP		 1821 break;
1822 case Opt_servern:
1823 /* servernetbiosname specified override *SMBSERVER */
1824 string = match_strdup(args);
1825 if (string == NULL)
1826 goto out_nomem;
1827
8830d7e0
SP		 1828 /* last byte, type, is 0x20 for servr type */
1829 memset(vol->target_rfc1001_name, 0x20,
1830 RFC1001_NAME_LEN_WITH_NULL);
1831
1832 /* BB are there cases in which a comma can be
1833 valid in this workstation netbios name
1834 (and need special handling)? */
1835
1836 /* user or mount helper must uppercase the
1837 netbios name */
1838 for (i = 0; i < 15; i++) {
1839 if (string[i] == 0)
1840 break;
1841 vol->target_rfc1001_name[i] = string[i];
1842 }
1843 /* The string has 16th byte zero still from
1844 set at top of the function */
1845 if (i == RFC1001_NAME_LEN && string[i] != 0)
0b456f04 1846 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
8830d7e0
SP		 1847 break;
1848 case Opt_ver:
1849 string = match_strdup(args);
1850 if (string == NULL)
1851 goto out_nomem;
1852
87e747cd 1853 if (strncasecmp(string, "1", 1) == 0) {
8830d7e0
SP		 1854 /* This is the default */
1855 break;
1856 }
1857 /* For all other value, error */
0b456f04 1858 pr_warn("CIFS: Invalid version specified\n");
b946845a 1859 goto cifs_parse_mount_err;
23db65f5
JL		 1860 case Opt_vers:
1861 string = match_strdup(args);
1862 if (string == NULL)
1863 goto out_nomem;
1864
1865 if (cifs_parse_smb_version(string, vol) != 0)
1866 goto cifs_parse_mount_err;
1867 break;
8830d7e0
SP		 1868 case Opt_sec:
1869 string = match_strdup(args);
1870 if (string == NULL)
1871 goto out_nomem;
1872
8830d7e0
SP		 1873 if (cifs_parse_security_flavors(string, vol) != 0)
1874 goto cifs_parse_mount_err;
1875 break;
15b6a473
JL		 1876 case Opt_cache:
1877 string = match_strdup(args);
1878 if (string == NULL)
1879 goto out_nomem;
1880
1881 if (cifs_parse_cache_flavor(string, vol) != 0)
1882 goto cifs_parse_mount_err;
1883 break;
8830d7e0 1884 default:
d8162558
JL		 1885 /*
1886 * An option we don't recognize. Save it off for later
1887 * if we haven't already found one
1888 */
1889 if (!invalid)
1890 invalid = data;
8830d7e0 1891 break;
1da177e4 1892 }
8830d7e0
SP		 1893 /* Free up any allocated string */
1894 kfree(string);
1895 string = NULL;
1da177e4 1896 }
0eb8a132 1897
d8162558 1898 if (!sloppy && invalid) {
0b456f04 1899 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
d8162558
JL		 1900 goto cifs_parse_mount_err;
1901 }
1902
8a8798a5
JL		 1903#ifndef CONFIG_KEYS
1904 /* Muliuser mounts require CONFIG_KEYS support */
1905 if (vol->multiuser) {
f96637be 1906 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
b946845a 1907 goto cifs_parse_mount_err;
0eb8a132 1908 }
8a8798a5 1909#endif
e5e69abd 1910 if (!vol->UNC) {
37d4f99b 1911 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
e5e69abd
JL		 1912 goto cifs_parse_mount_err;
1913 }
0eb8a132 1914
62a1a439
JL		 1915 /* make sure UNC has a share name */
1916 if (!strchr(vol->UNC + 3, '\\')) {
f96637be 1917 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
62a1a439
JL		 1918 goto cifs_parse_mount_err;
1919 }
1920
b979aaa1
JL		 1921 if (!got_ip) {
1922 /* No ip= option specified? Try to get it from UNC */
1923 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1924 strlen(&vol->UNC[2]))) {
0b456f04 1925 pr_err("Unable to determine destination address.\n");
b979aaa1
JL		 1926 goto cifs_parse_mount_err;
1927 }
1928 }
1929
1930 /* set the port that we got earlier */
1931 cifs_set_port(dstaddr, port);
1da177e4 1932
9b9d6b24
JL		 1933 if (uid_specified)
1934 vol->override_uid = override_uid;
1935 else if (override_uid == 1)
0b456f04 1936 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
9b9d6b24
JL		 1937
1938 if (gid_specified)
1939 vol->override_gid = override_gid;
1940 else if (override_gid == 1)
0b456f04 1941 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
9b9d6b24 1942
b946845a 1943 kfree(mountdata_copy);
1da177e4 1944 return 0;
b946845a 1945
8830d7e0 1946out_nomem:
0b456f04 1947 pr_warn("Could not allocate temporary buffer\n");
b946845a 1948cifs_parse_mount_err:
8830d7e0 1949 kfree(string);
b946845a
SF		 1950 kfree(mountdata_copy);
1951 return 1;
1da177e4
LT		 1952}
1953
3eb9a889
BG		 1954/** Returns true if srcaddr isn't specified and rhs isn't
1955 * specified, or if srcaddr is specified and
1956 * matches the IP address of the rhs argument.
1957 */
1958static bool
1959srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1960{
1961 switch (srcaddr->sa_family) {
1962 case AF_UNSPEC:
1963 return (rhs->sa_family == AF_UNSPEC);
1964 case AF_INET: {
1965 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1966 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1967 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1968 }
1969 case AF_INET6: {
1970 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
e3e2775c 1971 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
3eb9a889
BG		 1972 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1973 }
1974 default:
1975 WARN_ON(1);
1976 return false; /* don't expect to be here */
1977 }
1978}
1979
4b886136
PS		 1980/*
1981 * If no port is specified in addr structure, we try to match with 445 port
1982 * and if it fails - with 139 ports. It should be called only if address
1983 * families of server and addr are equal.
1984 */
1985static bool
1986match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1987{
6da97910 1988 __be16 port, *sport;
4b886136
PS		 1989
1990 switch (addr->sa_family) {
1991 case AF_INET:
1992 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1993 port = ((struct sockaddr_in *) addr)->sin_port;
1994 break;
1995 case AF_INET6:
1996 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1997 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1998 break;
1999 default:
2000 WARN_ON(1);
2001 return false;
2002 }
2003
2004 if (!port) {
2005 port = htons(CIFS_PORT);
2006 if (port == *sport)
2007 return true;
2008
2009 port = htons(RFC1001_PORT);
2010 }
2011
2012 return port == *sport;
2013}
3eb9a889 2014
4515148e 2015static bool
3eb9a889
BG		 2016match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2017 struct sockaddr *srcaddr)
4515148e 2018{
4515148e 2019 switch (addr->sa_family) {
a9f1b85e
PS		 2020 case AF_INET: {
2021 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2022 struct sockaddr_in *srv_addr4 =
2023 (struct sockaddr_in *)&server->dstaddr;
2024
2025 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
4515148e 2026 return false;
4515148e 2027 break;
a9f1b85e
PS		 2028 }
2029 case AF_INET6: {
2030 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2031 struct sockaddr_in6 *srv_addr6 =
2032 (struct sockaddr_in6 *)&server->dstaddr;
2033
4515148e 2034 if (!ipv6_addr_equal(&addr6->sin6_addr,
a9f1b85e 2035 &srv_addr6->sin6_addr))
4515148e 2036 return false;
a9f1b85e 2037 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
4515148e 2038 return false;
4515148e
JL		 2039 break;
2040 }
a9f1b85e
PS		 2041 default:
2042 WARN_ON(1);
2043 return false; /* don't expect to be here */
2044 }
4515148e 2045
3eb9a889
BG		 2046 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2047 return false;
2048
4515148e
JL		 2049 return true;
2050}
2051
daf5b0b6
JL		 2052static bool
2053match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2054{
3f618223
JL		 2055 /*
2056 * The select_sectype function should either return the vol->sectype
2057 * that was specified, or "Unspecified" if that sectype was not
2058 * compatible with the given NEGOTIATE request.
2059 */
2060 if (select_sectype(server, vol->sectype) == Unspecified)
daf5b0b6 2061 return false;
daf5b0b6 2062
3f618223
JL		 2063 /*
2064 * Now check if signing mode is acceptable. No need to check
2065 * global_secflags at this point since if MUST_SIGN is set then
2066 * the server->sign had better be too.
2067 */
38d77c50
JL		 2068 if (vol->sign && !server->sign)
2069 return false;
daf5b0b6
JL		 2070
2071 return true;
2072}
2073
9fa114f7 2074static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
37bb04e5 2075{
9fa114f7
JL		 2076 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2077
a0b3df5c
JL		 2078 if (vol->nosharesock)
2079 return 0;
2080
23db65f5
JL		 2081 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2082 return 0;
2083
37bb04e5
PS		 2084 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2085 return 0;
2086
2087 if (!match_address(server, addr,
2088 (struct sockaddr *)&vol->srcaddr))
2089 return 0;
2090
2091 if (!match_port(server, addr))
2092 return 0;
2093
2094 if (!match_security(server, vol))
2095 return 0;
2096
b782fcc1 2097 if (server->echo_interval != vol->echo_interval * HZ)
adfeb3e0
SF		 2098 return 0;
2099
37bb04e5
PS		 2100 return 1;
2101}
2102
e7ddee90 2103static struct TCP_Server_Info *
9fa114f7 2104cifs_find_tcp_session(struct smb_vol *vol)
1da177e4 2105{
e7ddee90 2106 struct TCP_Server_Info *server;
e7ddee90 2107
3f9bcca7 2108 spin_lock(&cifs_tcp_ses_lock);
4515148e 2109 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
9fa114f7 2110 if (!match_server(server, vol))
daf5b0b6
JL		 2111 continue;
2112
e7ddee90 2113 ++server->srv_count;
3f9bcca7 2114 spin_unlock(&cifs_tcp_ses_lock);
f96637be 2115 cifs_dbg(FYI, "Existing tcp session with server found\n");
e7ddee90 2116 return server;
1da177e4 2117 }
3f9bcca7 2118 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2119 return NULL;
2120}
1b20d672 2121
53e0e11e
PS		 2122void
2123cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1da177e4 2124{
a5c3e1c7
SF		 2125 struct task_struct *task;
2126
3f9bcca7 2127 spin_lock(&cifs_tcp_ses_lock);
e7ddee90 2128 if (--server->srv_count > 0) {
3f9bcca7 2129 spin_unlock(&cifs_tcp_ses_lock);
e7ddee90 2130 return;
1da177e4 2131 }
1b20d672 2132
f1d0c998
RL		 2133 put_net(cifs_net_ns(server));
2134
e7ddee90 2135 list_del_init(&server->tcp_ses_list);
3f9bcca7 2136 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2137
c74093b6
JL		 2138 cancel_delayed_work_sync(&server->echo);
2139
53e0e11e
PS		 2140#ifdef CONFIG_CIFS_SMB2
2141 if (from_reconnect)
2142 /*
2143 * Avoid deadlock here: reconnect work calls
2144 * cifs_put_tcp_session() at its end. Need to be sure
2145 * that reconnect work does nothing with server pointer after
2146 * that step.
2147 */
2148 cancel_delayed_work(&server->reconnect);
2149 else
2150 cancel_delayed_work_sync(&server->reconnect);
2151#endif
2152
e7ddee90
JL		 2153 spin_lock(&GlobalMid_Lock);
2154 server->tcpStatus = CifsExiting;
2155 spin_unlock(&GlobalMid_Lock);
dea570e0 2156
d2b91521 2157 cifs_crypto_shash_release(server);
488f1d2d
SJ		 2158 cifs_fscache_release_client_cookie(server);
2159
21e73393
SP		 2160 kfree(server->session_key.response);
2161 server->session_key.response = NULL;
2162 server->session_key.len = 0;
a5c3e1c7
SF		 2163
2164 task = xchg(&server->tsk, NULL);
2165 if (task)
2166 force_sig(SIGKILL, task);
1da177e4
LT		 2167}
2168
63c038c2
JL		 2169static struct TCP_Server_Info *
2170cifs_get_tcp_session(struct smb_vol *volume_info)
2171{
2172 struct TCP_Server_Info *tcp_ses = NULL;
63c038c2
JL		 2173 int rc;
2174
f96637be 2175 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
63c038c2
JL		 2176
2177 /* see if we already have a matching tcp_ses */
9fa114f7 2178 tcp_ses = cifs_find_tcp_session(volume_info);
63c038c2
JL		 2179 if (tcp_ses)
2180 return tcp_ses;
2181
2182 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2183 if (!tcp_ses) {
2184 rc = -ENOMEM;
2185 goto out_err;
2186 }
2187
23db65f5
JL		 2188 tcp_ses->ops = volume_info->ops;
2189 tcp_ses->vals = volume_info->vals;
f1d0c998 2190 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
63c038c2
JL		 2191 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2192 if (IS_ERR(tcp_ses->hostname)) {
2193 rc = PTR_ERR(tcp_ses->hostname);
f7c5445a 2194 goto out_err_crypto_release;
63c038c2
JL		 2195 }
2196
2197 tcp_ses->noblocksnd = volume_info->noblocksnd;
2198 tcp_ses->noautotune = volume_info->noautotune;
6a5fa236 2199 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
fc40f9cf 2200 tcp_ses->in_flight = 0;
2d86dbc9 2201 tcp_ses->credits = 1;
63c038c2
JL		 2202 init_waitqueue_head(&tcp_ses->response_q);
2203 init_waitqueue_head(&tcp_ses->request_q);
2204 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2205 mutex_init(&tcp_ses->srv_mutex);
2206 memcpy(tcp_ses->workstation_RFC1001_name,
2207 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2208 memcpy(tcp_ses->server_RFC1001_name,
2209 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
5d0d2882 2210 tcp_ses->session_estab = false;
63c038c2 2211 tcp_ses->sequence_number = 0;
fda35943 2212 tcp_ses->lstrp = jiffies;
58fa015f 2213 spin_lock_init(&tcp_ses->req_lock);
63c038c2
JL		 2214 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2215 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
c74093b6 2216 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
53e0e11e
PS		 2217#ifdef CONFIG_CIFS_SMB2
2218 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2219 mutex_init(&tcp_ses->reconnect_mutex);
2220#endif
9fa114f7
JL		 2221 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2222 sizeof(tcp_ses->srcaddr));
2223 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2224 sizeof(tcp_ses->dstaddr));
39552ea8 2225#ifdef CONFIG_CIFS_SMB2
fa70b87c 2226 generate_random_uuid(tcp_ses->client_guid);
39552ea8 2227#endif
63c038c2
JL		 2228 /*
2229 * at this point we are the only ones with the pointer
2230 * to the struct since the kernel thread not created yet
2231 * no need to spinlock this init of tcpStatus or srv_count
2232 */
2233 tcp_ses->tcpStatus = CifsNew;
2234 ++tcp_ses->srv_count;
2235
adfeb3e0
SF		 2236 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2237 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2238 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2239 else
2240 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2241
a9f1b85e 2242 rc = ip_connect(tcp_ses);
63c038c2 2243 if (rc < 0) {
f96637be 2244 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
f7c5445a 2245 goto out_err_crypto_release;
63c038c2
JL		 2246 }
2247
2248 /*
2249 * since we're in a cifs function already, we know that
2250 * this will succeed. No need for try_module_get().
2251 */
2252 __module_get(THIS_MODULE);
7c97c200 2253 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
63c038c2
JL		 2254 tcp_ses, "cifsd");
2255 if (IS_ERR(tcp_ses->tsk)) {
2256 rc = PTR_ERR(tcp_ses->tsk);
f96637be 2257 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
63c038c2 2258 module_put(THIS_MODULE);
f7c5445a 2259 goto out_err_crypto_release;
63c038c2 2260 }
fd88ce93 2261 tcp_ses->tcpStatus = CifsNeedNegotiate;
63c038c2
JL		 2262
2263 /* thread spawned, put it on the list */
3f9bcca7 2264 spin_lock(&cifs_tcp_ses_lock);
63c038c2 2265 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
3f9bcca7 2266 spin_unlock(&cifs_tcp_ses_lock);
63c038c2 2267
488f1d2d
SJ		 2268 cifs_fscache_get_client_cookie(tcp_ses);
2269
c74093b6 2270 /* queue echo request delayed work */
adfeb3e0 2271 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
c74093b6 2272
63c038c2
JL		 2273 return tcp_ses;
2274
f7c5445a 2275out_err_crypto_release:
d2b91521
SP		 2276 cifs_crypto_shash_release(tcp_ses);
2277
f1d0c998
RL		 2278 put_net(cifs_net_ns(tcp_ses));
2279
63c038c2
JL		 2280out_err:
2281 if (tcp_ses) {
8347a5cd
SF		 2282 if (!IS_ERR(tcp_ses->hostname))
2283 kfree(tcp_ses->hostname);
63c038c2
JL		 2284 if (tcp_ses->ssocket)
2285 sock_release(tcp_ses->ssocket);
2286 kfree(tcp_ses);
2287 }
2288 return ERR_PTR(rc);
2289}
2290
96daf2b0 2291static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
37bb04e5 2292{
3f618223
JL		 2293 if (vol->sectype != Unspecified &&
2294 vol->sectype != ses->sectype)
2295 return 0;
2296
2297 switch (ses->sectype) {
37bb04e5 2298 case Kerberos:
64ed39dd 2299 if (!uid_eq(vol->cred_uid, ses->cred_uid))
37bb04e5
PS		 2300 return 0;
2301 break;
2302 default:
04febabc
JL		 2303 /* NULL username means anonymous session */
2304 if (ses->user_name == NULL) {
2305 if (!vol->nullauth)
2306 return 0;
2307 break;
2308 }
2309
37bb04e5 2310 /* anything else takes username/password */
04febabc
JL		 2311 if (strncmp(ses->user_name,
2312 vol->username ? vol->username : "",
8c3a2b4c 2313 CIFS_MAX_USERNAME_LEN))
37bb04e5 2314 return 0;
08b37d51 2315 if ((vol->username && strlen(vol->username) != 0) &&
37bb04e5
PS		 2316 ses->password != NULL &&
2317 strncmp(ses->password,
2318 vol->password ? vol->password : "",
8c3a2b4c 2319 CIFS_MAX_PASSWORD_LEN))
37bb04e5
PS		 2320 return 0;
2321 }
2322 return 1;
2323}
2324
96daf2b0 2325static struct cifs_ses *
4ff67b72 2326cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1da177e4 2327{
96daf2b0 2328 struct cifs_ses *ses;
dea570e0 2329
3f9bcca7 2330 spin_lock(&cifs_tcp_ses_lock);
4ff67b72 2331 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
7f48558e
SP		 2332 if (ses->status == CifsExiting)
2333 continue;
37bb04e5
PS		 2334 if (!match_session(ses, vol))
2335 continue;
14fbf50d 2336 ++ses->ses_count;
3f9bcca7 2337 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2338 return ses;
2339 }
3f9bcca7 2340 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2341 return NULL;
2342}
dea570e0 2343
14fbf50d 2344static void
96daf2b0 2345cifs_put_smb_ses(struct cifs_ses *ses)
14fbf50d 2346{
7f48558e 2347 unsigned int rc, xid;
14fbf50d 2348 struct TCP_Server_Info *server = ses->server;
dea570e0 2349
f96637be 2350 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
7f48558e 2351
3f9bcca7 2352 spin_lock(&cifs_tcp_ses_lock);
7f48558e
SP		 2353 if (ses->status == CifsExiting) {
2354 spin_unlock(&cifs_tcp_ses_lock);
2355 return;
2356 }
14fbf50d 2357 if (--ses->ses_count > 0) {
3f9bcca7 2358 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2359 return;
2360 }
7f48558e
SP		 2361 if (ses->status == CifsGood)
2362 ses->status = CifsExiting;
3f9bcca7 2363 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2364
7f48558e 2365 if (ses->status == CifsExiting && server->ops->logoff) {
6d5786a3 2366 xid = get_xid();
7f48558e
SP		 2367 rc = server->ops->logoff(xid, ses);
2368 if (rc)
2369 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2370 __func__, rc);
6d5786a3 2371 _free_xid(xid);
14fbf50d 2372 }
7f48558e
SP		 2373
2374 spin_lock(&cifs_tcp_ses_lock);
2375 list_del_init(&ses->smb_ses_list);
2376 spin_unlock(&cifs_tcp_ses_lock);
2377
14fbf50d 2378 sesInfoFree(ses);
53e0e11e 2379 cifs_put_tcp_session(server, 0);
14fbf50d 2380}
dea570e0 2381
8a8798a5
JL		 2382#ifdef CONFIG_KEYS
2383
057d6332
CG		 2384/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2385#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
8a8798a5
JL		 2386
2387/* Populate username and pw fields from keyring if possible */
2388static int
2389cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2390{
2391 int rc = 0;
146aa8b1
DH		 2392 const char *delim, *payload;
2393 char *desc;
8a8798a5
JL		 2394 ssize_t len;
2395 struct key *key;
2396 struct TCP_Server_Info *server = ses->server;
2397 struct sockaddr_in *sa;
2398 struct sockaddr_in6 *sa6;
146aa8b1 2399 const struct user_key_payload *upayload;
8a8798a5
JL		 2400
2401 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2402 if (!desc)
2403 return -ENOMEM;
2404
2405 /* try to find an address key first */
2406 switch (server->dstaddr.ss_family) {
2407 case AF_INET:
2408 sa = (struct sockaddr_in *)&server->dstaddr;
2409 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2410 break;
2411 case AF_INET6:
2412 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2413 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2414 break;
2415 default:
f96637be
JP		 2416 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2417 server->dstaddr.ss_family);
8a8798a5
JL		 2418 rc = -EINVAL;
2419 goto out_err;
2420 }
2421
f96637be 2422 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2423 key = request_key(&key_type_logon, desc, "");
2424 if (IS_ERR(key)) {
2425 if (!ses->domainName) {
f96637be 2426 cifs_dbg(FYI, "domainName is NULL\n");
8a8798a5
JL		 2427 rc = PTR_ERR(key);
2428 goto out_err;
2429 }
2430
2431 /* didn't work, try to find a domain key */
2432 sprintf(desc, "cifs:d:%s", ses->domainName);
f96637be 2433 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2434 key = request_key(&key_type_logon, desc, "");
2435 if (IS_ERR(key)) {
2436 rc = PTR_ERR(key);
2437 goto out_err;
2438 }
2439 }
2440
2441 down_read(&key->sem);
146aa8b1 2442 upayload = user_key_payload(key);
8a8798a5 2443 if (IS_ERR_OR_NULL(upayload)) {
4edc53c1 2444 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
8a8798a5
JL		 2445 goto out_key_put;
2446 }
2447
2448 /* find first : in payload */
146aa8b1 2449 payload = upayload->data;
8a8798a5 2450 delim = strnchr(payload, upayload->datalen, ':');
f96637be 2451 cifs_dbg(FYI, "payload=%s\n", payload);
8a8798a5 2452 if (!delim) {
f96637be
JP		 2453 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2454 upayload->datalen);
8a8798a5
JL		 2455 rc = -EINVAL;
2456 goto out_key_put;
2457 }
2458
2459 len = delim - payload;
8c3a2b4c 2460 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
f96637be
JP		 2461 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2462 len);
8a8798a5
JL		 2463 rc = -EINVAL;
2464 goto out_key_put;
2465 }
2466
2467 vol->username = kstrndup(payload, len, GFP_KERNEL);
2468 if (!vol->username) {
f96637be
JP		 2469 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2470 len);
8a8798a5
JL		 2471 rc = -ENOMEM;
2472 goto out_key_put;
2473 }
f96637be 2474 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
8a8798a5
JL		 2475
2476 len = key->datalen - (len + 1);
8c3a2b4c 2477 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
f96637be 2478 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
8a8798a5
JL		 2479 rc = -EINVAL;
2480 kfree(vol->username);
2481 vol->username = NULL;
2482 goto out_key_put;
2483 }
2484
2485 ++delim;
2486 vol->password = kstrndup(delim, len, GFP_KERNEL);
2487 if (!vol->password) {
f96637be
JP		 2488 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2489 len);
8a8798a5
JL		 2490 rc = -ENOMEM;
2491 kfree(vol->username);
2492 vol->username = NULL;
2493 goto out_key_put;
2494 }
2495
2496out_key_put:
2497 up_read(&key->sem);
2498 key_put(key);
2499out_err:
2500 kfree(desc);
f96637be 2501 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
8a8798a5
JL		 2502 return rc;
2503}
2504#else /* ! CONFIG_KEYS */
2505static inline int
2506cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2507 struct cifs_ses *ses __attribute__((unused)))
2508{
2509 return -ENOSYS;
2510}
2511#endif /* CONFIG_KEYS */
2512
96daf2b0 2513static struct cifs_ses *
36988c76
JL		 2514cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2515{
286170aa
PS		 2516 int rc = -ENOMEM;
2517 unsigned int xid;
96daf2b0 2518 struct cifs_ses *ses;
a9f1b85e
PS		 2519 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2520 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
36988c76 2521
6d5786a3 2522 xid = get_xid();
36988c76 2523
4ff67b72 2524 ses = cifs_find_smb_ses(server, volume_info);
36988c76 2525 if (ses) {
f96637be
JP		 2526 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2527 ses->status);
36988c76 2528
36988c76 2529 mutex_lock(&ses->session_mutex);
198b5682
JL		 2530 rc = cifs_negotiate_protocol(xid, ses);
2531 if (rc) {
2532 mutex_unlock(&ses->session_mutex);
2533 /* problem -- put our ses reference */
2534 cifs_put_smb_ses(ses);
6d5786a3 2535 free_xid(xid);
198b5682
JL		 2536 return ERR_PTR(rc);
2537 }
36988c76 2538 if (ses->need_reconnect) {
f96637be 2539 cifs_dbg(FYI, "Session needs reconnect\n");
36988c76
JL		 2540 rc = cifs_setup_session(xid, ses,
2541 volume_info->local_nls);
2542 if (rc) {
2543 mutex_unlock(&ses->session_mutex);
2544 /* problem -- put our reference */
2545 cifs_put_smb_ses(ses);
6d5786a3 2546 free_xid(xid);
36988c76
JL		 2547 return ERR_PTR(rc);
2548 }
2549 }
2550 mutex_unlock(&ses->session_mutex);
460cf341
JL		 2551
2552 /* existing SMB ses has a server reference already */
53e0e11e 2553 cifs_put_tcp_session(server, 0);
6d5786a3 2554 free_xid(xid);
36988c76
JL		 2555 return ses;
2556 }
2557
f96637be 2558 cifs_dbg(FYI, "Existing smb sess not found\n");
36988c76
JL		 2559 ses = sesInfoAlloc();
2560 if (ses == NULL)
2561 goto get_ses_fail;
2562
2563 /* new SMB session uses our server ref */
2564 ses->server = server;
a9f1b85e
PS		 2565 if (server->dstaddr.ss_family == AF_INET6)
2566 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
36988c76 2567 else
a9f1b85e 2568 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
36988c76 2569
8727c8a8
SF		 2570 if (volume_info->username) {
2571 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2572 if (!ses->user_name)
2573 goto get_ses_fail;
2574 }
36988c76
JL		 2575
2576 /* volume_info->password freed at unmount */
2577 if (volume_info->password) {
2578 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2579 if (!ses->password)
2580 goto get_ses_fail;
2581 }
2582 if (volume_info->domainname) {
d3686d54
SP		 2583 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2584 if (!ses->domainName)
2585 goto get_ses_fail;
36988c76 2586 }
39566443
GP		 2587 if (volume_info->domainauto)
2588 ses->domainAuto = volume_info->domainauto;
3e4b3e1f 2589 ses->cred_uid = volume_info->cred_uid;
36988c76 2590 ses->linux_uid = volume_info->linux_uid;
d9b94201 2591
28e11bd8
JL		 2592 ses->sectype = volume_info->sectype;
2593 ses->sign = volume_info->sign;
36988c76
JL		 2594
2595 mutex_lock(&ses->session_mutex);
198b5682
JL		 2596 rc = cifs_negotiate_protocol(xid, ses);
2597 if (!rc)
2598 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
36988c76 2599 mutex_unlock(&ses->session_mutex);
c8e56f1f 2600 if (rc)
36988c76
JL		 2601 goto get_ses_fail;
2602
2603 /* success, put it on the list */
3f9bcca7 2604 spin_lock(&cifs_tcp_ses_lock);
36988c76 2605 list_add(&ses->smb_ses_list, &server->smb_ses_list);
3f9bcca7 2606 spin_unlock(&cifs_tcp_ses_lock);
36988c76 2607
6d5786a3 2608 free_xid(xid);
36988c76
JL		 2609 return ses;
2610
2611get_ses_fail:
2612 sesInfoFree(ses);
6d5786a3 2613 free_xid(xid);
36988c76
JL		 2614 return ERR_PTR(rc);
2615}
2616
96daf2b0 2617static int match_tcon(struct cifs_tcon *tcon, const char *unc)
37bb04e5
PS		 2618{
2619 if (tcon->tidStatus == CifsExiting)
2620 return 0;
2621 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2622 return 0;
2623 return 1;
2624}
2625
96daf2b0 2626static struct cifs_tcon *
8b217fe7 2627cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
f1987b44
JL		 2628{
2629 struct list_head *tmp;
96daf2b0 2630 struct cifs_tcon *tcon;
f1987b44 2631
3f9bcca7 2632 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2633 list_for_each(tmp, &ses->tcon_list) {
96daf2b0 2634 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
8b217fe7 2635 if (!match_tcon(tcon, volume_info->UNC))
f1987b44 2636 continue;
8b217fe7
SF		 2637
2638#ifdef CONFIG_CIFS_SMB2
2639 if (tcon->snapshot_time != volume_info->snapshot_time)
f1987b44 2640 continue;
8b217fe7
SF		 2641#endif /* CONFIG_CIFS_SMB2 */
2642
f1987b44 2643 ++tcon->tc_count;
3f9bcca7 2644 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2645 return tcon;
1da177e4 2646 }
3f9bcca7 2647 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2648 return NULL;
2649}
2650
53e0e11e 2651void
96daf2b0 2652cifs_put_tcon(struct cifs_tcon *tcon)
f1987b44 2653{
2e6e02ab 2654 unsigned int xid;
96daf2b0 2655 struct cifs_ses *ses = tcon->ses;
f1987b44 2656
f96637be 2657 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3f9bcca7 2658 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2659 if (--tcon->tc_count > 0) {
3f9bcca7 2660 spin_unlock(&cifs_tcp_ses_lock);
f1987b44
JL		 2661 return;
2662 }
2663
2664 list_del_init(&tcon->tcon_list);
3f9bcca7 2665 spin_unlock(&cifs_tcp_ses_lock);
f1987b44 2666
6d5786a3 2667 xid = get_xid();
2e6e02ab
PS		 2668 if (ses->server->ops->tree_disconnect)
2669 ses->server->ops->tree_disconnect(xid, tcon);
6d5786a3 2670 _free_xid(xid);
f1987b44 2671
d03382ce 2672 cifs_fscache_release_super_cookie(tcon);
9f841593 2673 tconInfoFree(tcon);
f1987b44
JL		 2674 cifs_put_smb_ses(ses);
2675}
2676
96daf2b0
SF		 2677static struct cifs_tcon *
2678cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
d00c28de
JL		 2679{
2680 int rc, xid;
96daf2b0 2681 struct cifs_tcon *tcon;
d00c28de 2682
8b217fe7 2683 tcon = cifs_find_tcon(ses, volume_info);
d00c28de 2684 if (tcon) {
f96637be 2685 cifs_dbg(FYI, "Found match on UNC path\n");
d00c28de
JL		 2686 /* existing tcon already has a reference */
2687 cifs_put_smb_ses(ses);
2688 if (tcon->seal != volume_info->seal)
f96637be 2689 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
d00c28de
JL		 2690 return tcon;
2691 }
2692
2e6e02ab
PS		 2693 if (!ses->server->ops->tree_connect) {
2694 rc = -ENOSYS;
2695 goto out_fail;
2696 }
2697
d00c28de
JL		 2698 tcon = tconInfoAlloc();
2699 if (tcon == NULL) {
2700 rc = -ENOMEM;
2701 goto out_fail;
2702 }
2703
8b217fe7
SF		 2704 if (volume_info->snapshot_time) {
2705#ifdef CONFIG_CIFS_SMB2
2706 if (ses->server->vals->protocol_id == 0) {
2707 cifs_dbg(VFS,
2708 "Use SMB2 or later for snapshot mount option\n");
2709 rc = -EOPNOTSUPP;
2710 goto out_fail;
2711 } else
2712 tcon->snapshot_time = volume_info->snapshot_time;
2713#else
2714 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2715 rc = -EOPNOTSUPP;
2716 goto out_fail;
2717#endif /* CONFIG_CIFS_SMB2 */
2718 }
2719
d00c28de
JL		 2720 tcon->ses = ses;
2721 if (volume_info->password) {
2722 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2723 if (!tcon->password) {
2724 rc = -ENOMEM;
2725 goto out_fail;
2726 }
2727 }
2728
2e6e02ab
PS		 2729 /*
2730 * BB Do we need to wrap session_mutex around this TCon call and Unix
2731 * SetFS as we do on SessSetup and reconnect?
2732 */
6d5786a3 2733 xid = get_xid();
2e6e02ab
PS		 2734 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2735 volume_info->local_nls);
6d5786a3 2736 free_xid(xid);
f96637be 2737 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
d00c28de
JL		 2738 if (rc)
2739 goto out_fail;
2740
2741 if (volume_info->nodfs) {
2742 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
f96637be 2743 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
d00c28de
JL		 2744 }
2745 tcon->seal = volume_info->seal;
b618f001
SF		 2746 tcon->use_persistent = false;
2747 /* check if SMB2 or later, CIFS does not support persistent handles */
2748 if (volume_info->persistent) {
2749 if (ses->server->vals->protocol_id == 0) {
2750 cifs_dbg(VFS,
2751 "SMB3 or later required for persistent handles\n");
2752 rc = -EOPNOTSUPP;
2753 goto out_fail;
592fafe6 2754#ifdef CONFIG_CIFS_SMB2
b618f001
SF		 2755 } else if (ses->server->capabilities &
2756 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2757 tcon->use_persistent = true;
2758 else /* persistent handles requested but not supported */ {
2759 cifs_dbg(VFS,
2760 "Persistent handles not supported on share\n");
2761 rc = -EOPNOTSUPP;
2762 goto out_fail;
592fafe6 2763#endif /* CONFIG_CIFS_SMB2 */
b618f001 2764 }
592fafe6 2765#ifdef CONFIG_CIFS_SMB2
b618f001
SF		 2766 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2767 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2768 && (volume_info->nopersistent == false)) {
2769 cifs_dbg(FYI, "enabling persistent handles\n");
2770 tcon->use_persistent = true;
592fafe6
SF		 2771#endif /* CONFIG_CIFS_SMB2 */
2772 } else if (volume_info->resilient) {
2773 if (ses->server->vals->protocol_id == 0) {
2774 cifs_dbg(VFS,
2775 "SMB2.1 or later required for resilient handles\n");
2776 rc = -EOPNOTSUPP;
2777 goto out_fail;
2778 }
2779 tcon->use_resilient = true;
b618f001
SF		 2780 }
2781
2e6e02ab
PS		 2782 /*
2783 * We can have only one retry value for a connection to a share so for
2784 * resources mounted more than once to the same server share the last
2785 * value passed in for the retry flag is used.
2786 */
d00c28de
JL		 2787 tcon->retry = volume_info->retry;
2788 tcon->nocase = volume_info->nocase;
2789 tcon->local_lease = volume_info->local_lease;
233839b1 2790 INIT_LIST_HEAD(&tcon->pending_opens);
d00c28de 2791
3f9bcca7 2792 spin_lock(&cifs_tcp_ses_lock);
d00c28de 2793 list_add(&tcon->tcon_list, &ses->tcon_list);
3f9bcca7 2794 spin_unlock(&cifs_tcp_ses_lock);
d00c28de 2795
d03382ce
SJ		 2796 cifs_fscache_get_super_cookie(tcon);
2797
d00c28de
JL		 2798 return tcon;
2799
2800out_fail:
2801 tconInfoFree(tcon);
2802 return ERR_PTR(rc);
2803}
2804
9d002df4
JL		 2805void
2806cifs_put_tlink(struct tcon_link *tlink)
2807{
2808 if (!tlink || IS_ERR(tlink))
2809 return;
2810
2811 if (!atomic_dec_and_test(&tlink->tl_count) ||
2812 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2813 tlink->tl_time = jiffies;
2814 return;
2815 }
2816
2817 if (!IS_ERR(tlink_tcon(tlink)))
2818 cifs_put_tcon(tlink_tcon(tlink));
2819 kfree(tlink);
2820 return;
2821}
d00c28de 2822
25c7f41e 2823static inline struct tcon_link *
cd51875d
PS		 2824cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2825{
2826 return cifs_sb->master_tlink;
2827}
25c7f41e
PS		 2828
2829static int
2830compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2831{
2832 struct cifs_sb_info *old = CIFS_SB(sb);
2833 struct cifs_sb_info *new = mnt_data->cifs_sb;
2834
2835 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2836 return 0;
2837
2838 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2839 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2840 return 0;
2841
25c7f41e 2842 /*
5eba8ab3
JL		 2843 * We want to share sb only if we don't specify an r/wsize or
2844 * specified r/wsize is greater than or equal to existing one.
25c7f41e
PS		 2845 */
2846 if (new->wsize && new->wsize < old->wsize)
2847 return 0;
2848
5eba8ab3
JL		 2849 if (new->rsize && new->rsize < old->rsize)
2850 return 0;
2851
1f68233c 2852 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
25c7f41e
PS		 2853 return 0;
2854
2855 if (old->mnt_file_mode != new->mnt_file_mode ||
2856 old->mnt_dir_mode != new->mnt_dir_mode)
2857 return 0;
2858
2859 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2860 return 0;
2861
2862 if (old->actimeo != new->actimeo)
2863 return 0;
2864
2865 return 1;
2866}
2867
c1d8b24d
SP		 2868static int
2869match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2870{
2871 struct cifs_sb_info *old = CIFS_SB(sb);
2872 struct cifs_sb_info *new = mnt_data->cifs_sb;
2873
2874 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2875 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2876 return 0;
2877 /* The prepath should be null terminated strings */
2878 if (strcmp(new->prepath, old->prepath))
2879 return 0;
2880
2881 return 1;
2882 }
2883 return 0;
2884}
2885
25c7f41e
PS		 2886int
2887cifs_match_super(struct super_block *sb, void *data)
2888{
2889 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2890 struct smb_vol *volume_info;
2891 struct cifs_sb_info *cifs_sb;
2892 struct TCP_Server_Info *tcp_srv;
96daf2b0
SF		 2893 struct cifs_ses *ses;
2894 struct cifs_tcon *tcon;
25c7f41e 2895 struct tcon_link *tlink;
25c7f41e
PS		 2896 int rc = 0;
2897
25c7f41e
PS		 2898 spin_lock(&cifs_tcp_ses_lock);
2899 cifs_sb = CIFS_SB(sb);
2900 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2901 if (IS_ERR(tlink)) {
2902 spin_unlock(&cifs_tcp_ses_lock);
2903 return rc;
2904 }
2905 tcon = tlink_tcon(tlink);
2906 ses = tcon->ses;
2907 tcp_srv = ses->server;
2908
2909 volume_info = mnt_data->vol;
2910
9fa114f7 2911 if (!match_server(tcp_srv, volume_info) ||
25c7f41e 2912 !match_session(ses, volume_info) ||
c1d8b24d
SP		 2913 !match_tcon(tcon, volume_info->UNC) ||
2914 !match_prepath(sb, mnt_data)) {
25c7f41e
PS		 2915 rc = 0;
2916 goto out;
2917 }
2918
2919 rc = compare_mount_options(sb, mnt_data);
2920out:
25c7f41e 2921 spin_unlock(&cifs_tcp_ses_lock);
f484b5d0 2922 cifs_put_tlink(tlink);
25c7f41e
PS		 2923 return rc;
2924}
2925
1da177e4 2926int
b669f33c 2927get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2e6e02ab
PS		 2928 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2929 struct dfs_info3_param **referrals, int remap)
1da177e4
LT		 2930{
2931 char *temp_unc;
2932 int rc = 0;
2933
b669f33c 2934 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2e6e02ab
PS		 2935 return -ENOSYS;
2936
2937 *num_referrals = 0;
2938 *referrals = NULL;
1da177e4 2939
2e6e02ab 2940 if (ses->ipc_tid == 0) {
1da177e4 2941 temp_unc = kmalloc(2 /* for slashes */ +
2e6e02ab
PS		 2942 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2943 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
1da177e4
LT		 2944 if (temp_unc == NULL)
2945 return -ENOMEM;
2946 temp_unc[0] = '\\';
2947 temp_unc[1] = '\\';
2e6e02ab
PS		 2948 strcpy(temp_unc + 2, ses->serverName);
2949 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2950 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2951 nls_codepage);
f96637be 2952 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
1da177e4
LT		 2953 kfree(temp_unc);
2954 }
2955 if (rc == 0)
b669f33c
PS		 2956 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2957 referrals, num_referrals,
2958 nls_codepage, remap);
2e6e02ab
PS		 2959 /*
2960 * BB - map targetUNCs to dfs_info3 structures, here or in
b669f33c 2961 * ses->server->ops->get_dfs_refer.
2e6e02ab 2962 */
1da177e4
LT		 2963
2964 return rc;
2965}
2966
09e50d55
JL		 2967#ifdef CONFIG_DEBUG_LOCK_ALLOC
2968static struct lock_class_key cifs_key[2];
2969static struct lock_class_key cifs_slock_key[2];
2970
2971static inline void
2972cifs_reclassify_socket4(struct socket *sock)
2973{
2974 struct sock *sk = sock->sk;
fafc4e1e 2975 BUG_ON(!sock_allow_reclassification(sk));
09e50d55
JL		 2976 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2977 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2978}
2979
2980static inline void
2981cifs_reclassify_socket6(struct socket *sock)
2982{
2983 struct sock *sk = sock->sk;
fafc4e1e 2984 BUG_ON(!sock_allow_reclassification(sk));
09e50d55
JL		 2985 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2986 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2987}
2988#else
2989static inline void
2990cifs_reclassify_socket4(struct socket *sock)
2991{
2992}
2993
2994static inline void
2995cifs_reclassify_socket6(struct socket *sock)
2996{
2997}
2998#endif
2999
1da177e4 3000/* See RFC1001 section 14 on representation of Netbios names */
50c2f753 3001static void rfc1002mangle(char *target, char *source, unsigned int length)
1da177e4 3002{
50c2f753 3003 unsigned int i, j;
1da177e4 3004
50c2f753 3005 for (i = 0, j = 0; i < (length); i++) {
1da177e4
LT		 3006 /* mask a nibble at a time and encode */
3007 target[j] = 'A' + (0x0F & (source[i] >> 4));
3008 target[j+1] = 'A' + (0x0F & source[i]);
50c2f753 3009 j += 2;
1da177e4
LT		 3010 }
3011
3012}
3013
3eb9a889
BG		 3014static int
3015bind_socket(struct TCP_Server_Info *server)
3016{
3017 int rc = 0;
3018 if (server->srcaddr.ss_family != AF_UNSPEC) {
3019 /* Bind to the specified local IP address */
3020 struct socket *socket = server->ssocket;
3021 rc = socket->ops->bind(socket,
3022 (struct sockaddr *) &server->srcaddr,
3023 sizeof(server->srcaddr));
3024 if (rc < 0) {
3025 struct sockaddr_in *saddr4;
3026 struct sockaddr_in6 *saddr6;
3027 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3028 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3029 if (saddr6->sin6_family == AF_INET6)
f96637be
JP		 3030 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3031 &saddr6->sin6_addr, rc);
3eb9a889 3032 else
f96637be
JP		 3033 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3034 &saddr4->sin_addr.s_addr, rc);
3eb9a889
BG		 3035 }
3036 }
3037 return rc;
3038}
1da177e4
LT		 3039
3040static int
a9f1b85e 3041ip_rfc1001_connect(struct TCP_Server_Info *server)
1da177e4
LT		 3042{
3043 int rc = 0;
a9f1b85e
PS		 3044 /*
3045 * some servers require RFC1001 sessinit before sending
3046 * negprot - BB check reconnection in case where second
3047 * sessinit is sent but no second negprot
3048 */
3049 struct rfc1002_session_packet *ses_init_buf;
3050 struct smb_hdr *smb_buf;
3051 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3052 GFP_KERNEL);
3053 if (ses_init_buf) {
3054 ses_init_buf->trailer.session_req.called_len = 32;
3055
997152f6 3056 if (server->server_RFC1001_name[0] != 0)
a9f1b85e
PS		 3057 rfc1002mangle(ses_init_buf->trailer.
3058 session_req.called_name,
3059 server->server_RFC1001_name,
3060 RFC1001_NAME_LEN_WITH_NULL);
3061 else
3062 rfc1002mangle(ses_init_buf->trailer.
3063 session_req.called_name,
3064 DEFAULT_CIFS_CALLED_NAME,
3065 RFC1001_NAME_LEN_WITH_NULL);
3066
3067 ses_init_buf->trailer.session_req.calling_len = 32;
3068
3069 /*
3070 * calling name ends in null (byte 16) from old smb
3071 * convention.
3072 */
c85c35f8 3073 if (server->workstation_RFC1001_name[0] != 0)
a9f1b85e
PS		 3074 rfc1002mangle(ses_init_buf->trailer.
3075 session_req.calling_name,
3076 server->workstation_RFC1001_name,
3077 RFC1001_NAME_LEN_WITH_NULL);
3078 else
3079 rfc1002mangle(ses_init_buf->trailer.
3080 session_req.calling_name,
3081 "LINUX_CIFS_CLNT",
3082 RFC1001_NAME_LEN_WITH_NULL);
3083
3084 ses_init_buf->trailer.session_req.scope1 = 0;
3085 ses_init_buf->trailer.session_req.scope2 = 0;
3086 smb_buf = (struct smb_hdr *)ses_init_buf;
3087
3088 /* sizeof RFC1002_SESSION_REQUEST with no scope */
be8e3b00 3089 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
a9f1b85e
PS		 3090 rc = smb_send(server, smb_buf, 0x44);
3091 kfree(ses_init_buf);
3092 /*
3093 * RFC1001 layer in at least one server
3094 * requires very short break before negprot
3095 * presumably because not expecting negprot
3096 * to follow so fast. This is a simple
3097 * solution that works without
3098 * complicating the code and causes no
3099 * significant slowing down on mount
3100 * for everyone else
3101 */
3102 usleep_range(1000, 2000);
3103 }
3104 /*
3105 * else the negprot may still work without this
3106 * even though malloc failed
3107 */
3108
3109 return rc;
3110}
3111
3112static int
3113generic_ip_connect(struct TCP_Server_Info *server)
3114{
3115 int rc = 0;
6da97910 3116 __be16 sport;
a9f1b85e 3117 int slen, sfamily;
bcf4b106 3118 struct socket *socket = server->ssocket;
a9f1b85e
PS		 3119 struct sockaddr *saddr;
3120
3121 saddr = (struct sockaddr *) &server->dstaddr;
3122
3123 if (server->dstaddr.ss_family == AF_INET6) {
3124 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3125 slen = sizeof(struct sockaddr_in6);
3126 sfamily = AF_INET6;
3127 } else {
3128 sport = ((struct sockaddr_in *) saddr)->sin_port;
3129 slen = sizeof(struct sockaddr_in);
3130 sfamily = AF_INET;
3131 }
1da177e4 3132
bcf4b106 3133 if (socket == NULL) {
f1d0c998
RL		 3134 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3135 IPPROTO_TCP, &socket, 1);
1da177e4 3136 if (rc < 0) {
f96637be 3137 cifs_dbg(VFS, "Error %d creating socket\n", rc);
a9f1b85e 3138 server->ssocket = NULL;
1da177e4 3139 return rc;
1da177e4 3140 }
bcf4b106
JL		 3141
3142 /* BB other socket options to set KEEPALIVE, NODELAY? */
f96637be 3143 cifs_dbg(FYI, "Socket created\n");
bcf4b106
JL		 3144 server->ssocket = socket;
3145 socket->sk->sk_allocation = GFP_NOFS;
a9f1b85e
PS		 3146 if (sfamily == AF_INET6)
3147 cifs_reclassify_socket6(socket);
3148 else
3149 cifs_reclassify_socket4(socket);
1da177e4
LT		 3150 }
3151
3eb9a889
BG		 3152 rc = bind_socket(server);
3153 if (rc < 0)
3154 return rc;
3155
bcf4b106
JL		 3156 /*
3157 * Eventually check for other socket options to change from
a9f1b85e
PS		 3158 * the default. sock_setsockopt not used because it expects
3159 * user space buffer
bcf4b106
JL		 3160 */
3161 socket->sk->sk_rcvtimeo = 7 * HZ;
da505c38 3162 socket->sk->sk_sndtimeo = 5 * HZ;
edf1ae40 3163
b387eaeb 3164 /* make the bufsizes depend on wsize/rsize and max requests */
bcf4b106
JL		 3165 if (server->noautotune) {
3166 if (socket->sk->sk_sndbuf < (200 * 1024))
3167 socket->sk->sk_sndbuf = 200 * 1024;
3168 if (socket->sk->sk_rcvbuf < (140 * 1024))
3169 socket->sk->sk_rcvbuf = 140 * 1024;
edf1ae40 3170 }
1da177e4 3171
6a5fa236 3172 if (server->tcp_nodelay) {
a9f1b85e 3173 int val = 1;
6a5fa236
SF		 3174 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3175 (char *)&val, sizeof(val));
3176 if (rc)
f96637be
JP		 3177 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3178 rc);
6a5fa236
SF		 3179 }
3180
f96637be 3181 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
bcf4b106 3182 socket->sk->sk_sndbuf,
b6b38f70 3183 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
bcf4b106 3184
ee1b3ea9
JL		 3185 rc = socket->ops->connect(socket, saddr, slen, 0);
3186 if (rc < 0) {
f96637be 3187 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
ee1b3ea9
JL		 3188 sock_release(socket);
3189 server->ssocket = NULL;
3190 return rc;
3191 }
3192
a9f1b85e
PS		 3193 if (sport == htons(RFC1001_PORT))
3194 rc = ip_rfc1001_connect(server);
50c2f753 3195
1da177e4
LT		 3196 return rc;
3197}
3198
3199static int
a9f1b85e 3200ip_connect(struct TCP_Server_Info *server)
1da177e4 3201{
6da97910 3202 __be16 *sport;
a9f1b85e
PS		 3203 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3204 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1da177e4 3205
a9f1b85e
PS		 3206 if (server->dstaddr.ss_family == AF_INET6)
3207 sport = &addr6->sin6_port;
3208 else
3209 sport = &addr->sin_port;
1da177e4 3210
a9f1b85e
PS		 3211 if (*sport == 0) {
3212 int rc;
1da177e4 3213
a9f1b85e
PS		 3214 /* try with 445 port at first */
3215 *sport = htons(CIFS_PORT);
3eb9a889 3216
a9f1b85e 3217 rc = generic_ip_connect(server);
1da177e4 3218 if (rc >= 0)
a9f1b85e 3219 return rc;
6a5fa236 3220
a9f1b85e
PS		 3221 /* if it failed, try with 139 port */
3222 *sport = htons(RFC1001_PORT);
6a5fa236
SF		 3223 }
3224
a9f1b85e 3225 return generic_ip_connect(server);
1da177e4
LT		 3226}
3227
6d5786a3 3228void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
2c6292ae 3229 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
8af18971
SF		 3230{
3231 /* if we are reconnecting then should we check to see if
3232 * any requested capabilities changed locally e.g. via
3233 * remount but we can not do much about it here
3234 * if they have (even if we could detect it by the following)
3235 * Perhaps we could add a backpointer to array of sb from tcon
3236 * or if we change to make all sb to same share the same
3237 * sb as NFS - then we only have one backpointer to sb.
3238 * What if we wanted to mount the server share twice once with
3239 * and once without posixacls or posix paths? */
3240 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
50c2f753 3241
c18c842b
SF		 3242 if (vol_info && vol_info->no_linux_ext) {
3243 tcon->fsUnixInfo.Capability = 0;
3244 tcon->unix_ext = 0; /* Unix Extensions disabled */
f96637be 3245 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
c18c842b
SF		 3246 return;
3247 } else if (vol_info)
3248 tcon->unix_ext = 1; /* Unix Extensions supported */
3249
3250 if (tcon->unix_ext == 0) {
f96637be 3251 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
c18c842b
SF		 3252 return;
3253 }
50c2f753 3254
fb8c4b14 3255 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
8af18971 3256 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
f96637be 3257 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
8af18971
SF		 3258 /* check for reconnect case in which we do not
3259 want to change the mount behavior if we can avoid it */
fb8c4b14 3260 if (vol_info == NULL) {
50c2f753 3261 /* turn off POSIX ACL and PATHNAMES if not set
8af18971
SF		 3262 originally at mount time */
3263 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3264 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
11b6d645
IM		 3265 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3266 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3267 cifs_dbg(VFS, "POSIXPATH support change\n");
8af18971 3268 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
11b6d645 3269 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
f96637be
JP		 3270 cifs_dbg(VFS, "possible reconnect error\n");
3271 cifs_dbg(VFS, "server disabled POSIX path support\n");
11b6d645 3272 }
8af18971 3273 }
50c2f753 3274
6848b733 3275 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3276 cifs_dbg(VFS, "per-share encryption not supported yet\n");
6848b733 3277
8af18971 3278 cap &= CIFS_UNIX_CAP_MASK;
75865f8c 3279 if (vol_info && vol_info->no_psx_acl)
8af18971 3280 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
75865f8c 3281 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
f96637be 3282 cifs_dbg(FYI, "negotiated posix acl support\n");
2c6292ae
AV		 3283 if (cifs_sb)
3284 cifs_sb->mnt_cifs_flags |=
3285 CIFS_MOUNT_POSIXACL;
8af18971
SF		 3286 }
3287
75865f8c 3288 if (vol_info && vol_info->posix_paths == 0)
8af18971 3289 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
75865f8c 3290 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
f96637be 3291 cifs_dbg(FYI, "negotiate posix pathnames\n");
2c6292ae
AV		 3292 if (cifs_sb)
3293 cifs_sb->mnt_cifs_flags |=
8af18971
SF		 3294 CIFS_MOUNT_POSIX_PATHS;
3295 }
50c2f753 3296
f96637be 3297 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
8af18971 3298#ifdef CONFIG_CIFS_DEBUG2
75865f8c 3299 if (cap & CIFS_UNIX_FCNTL_CAP)
f96637be 3300 cifs_dbg(FYI, "FCNTL cap\n");
75865f8c 3301 if (cap & CIFS_UNIX_EXTATTR_CAP)
f96637be 3302 cifs_dbg(FYI, "EXTATTR cap\n");
75865f8c 3303 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3304 cifs_dbg(FYI, "POSIX path cap\n");
75865f8c 3305 if (cap & CIFS_UNIX_XATTR_CAP)
f96637be 3306 cifs_dbg(FYI, "XATTR cap\n");
75865f8c 3307 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
f96637be 3308 cifs_dbg(FYI, "POSIX ACL cap\n");
75865f8c 3309 if (cap & CIFS_UNIX_LARGE_READ_CAP)
f96637be 3310 cifs_dbg(FYI, "very large read cap\n");
75865f8c 3311 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
f96637be 3312 cifs_dbg(FYI, "very large write cap\n");
6848b733 3313 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
f96637be 3314 cifs_dbg(FYI, "transport encryption cap\n");
6848b733 3315 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3316 cifs_dbg(FYI, "mandatory transport encryption cap\n");
8af18971
SF		 3317#endif /* CIFS_DEBUG2 */
3318 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
442aa310 3319 if (vol_info == NULL) {
f96637be 3320 cifs_dbg(FYI, "resetting capabilities failed\n");
442aa310 3321 } else
f96637be 3322 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 3323
8af18971
SF		 3324 }
3325 }
3326}
3327
4214ebf4 3328int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
724d9f1c 3329 struct cifs_sb_info *cifs_sb)
b1c8d2b4 3330{
2de970ff
JL		 3331 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3332
2ced6f69
AV		 3333 spin_lock_init(&cifs_sb->tlink_tree_lock);
3334 cifs_sb->tlink_tree = RB_ROOT;
3335
25c7f41e 3336 /*
5eba8ab3
JL		 3337 * Temporarily set r/wsize for matching superblock. If we end up using
3338 * new sb then client will later negotiate it downward if needed.
25c7f41e 3339 */
5eba8ab3 3340 cifs_sb->rsize = pvolume_info->rsize;
25c7f41e
PS		 3341 cifs_sb->wsize = pvolume_info->wsize;
3342
3b795210
SF		 3343 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3344 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3345 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3346 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
f96637be
JP		 3347 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3348 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3b795210 3349
6d20e840 3350 cifs_sb->actimeo = pvolume_info->actimeo;
724d9f1c 3351 cifs_sb->local_nls = pvolume_info->local_nls;
6d20e840 3352
3b795210
SF		 3353 if (pvolume_info->noperm)
3354 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3355 if (pvolume_info->setuids)
3356 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
95932655
SF		 3357 if (pvolume_info->setuidfromacl)
3358 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3b795210
SF		 3359 if (pvolume_info->server_ino)
3360 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3361 if (pvolume_info->remap)
2baa2682
SF		 3362 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3363 if (pvolume_info->sfu_remap)
3b795210
SF		 3364 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3365 if (pvolume_info->no_xattr)
3366 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3367 if (pvolume_info->sfu_emul)
3368 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3369 if (pvolume_info->nobrl)
3370 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
be652445 3371 if (pvolume_info->nostrictsync)
4717bed6 3372 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
13a6e42a
SF		 3373 if (pvolume_info->mand_lock)
3374 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
d4ffff1f
PS		 3375 if (pvolume_info->rwpidforward)
3376 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3b795210
SF		 3377 if (pvolume_info->cifs_acl)
3378 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3c7c87fd 3379 if (pvolume_info->backupuid_specified) {
3d3ea8e6 3380 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3c7c87fd
SP		 3381 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3382 }
3383 if (pvolume_info->backupgid_specified) {
3d3ea8e6 3384 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3c7c87fd
SP		 3385 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3386 }
3b795210
SF		 3387 if (pvolume_info->override_uid)
3388 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3389 if (pvolume_info->override_gid)
3390 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3391 if (pvolume_info->dynperm)
3392 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
fa1df75d
SJ		 3393 if (pvolume_info->fsc)
3394 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
0eb8a132
JL		 3395 if (pvolume_info->multiuser)
3396 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3397 CIFS_MOUNT_NO_PERM);
d39454ff
PS		 3398 if (pvolume_info->strict_io)
3399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3b795210 3400 if (pvolume_info->direct_io) {
f96637be 3401 cifs_dbg(FYI, "mounting share using direct i/o\n");
3b795210
SF		 3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3403 }
736a3320
SM		 3404 if (pvolume_info->mfsymlinks) {
3405 if (pvolume_info->sfu_emul) {
db8b631d
SF		 3406 /*
3407 * Our SFU ("Services for Unix" emulation does not allow
3408 * creating symlinks but does allow reading existing SFU
3409 * symlinks (it does allow both creating and reading SFU
3410 * style mknod and FIFOs though). When "mfsymlinks" and
3411 * "sfu" are both enabled at the same time, it allows
3412 * reading both types of symlinks, but will only create
3413 * them with mfsymlinks format. This allows better
3414 * Apple compatibility (probably better for Samba too)
3415 * while still recognizing old Windows style symlinks.
3416 */
3417 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
736a3320 3418 }
db8b631d 3419 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
736a3320 3420 }
3b795210
SF		 3421
3422 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
f96637be 3423 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
4214ebf4
SP		 3424
3425 if (pvolume_info->prepath) {
3426 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3427 if (cifs_sb->prepath == NULL)
3428 return -ENOMEM;
3429 }
3430
3431 return 0;
b1c8d2b4
JL		 3432}
3433
b9bce2e9
JL		 3434static void
3435cleanup_volume_info_contents(struct smb_vol *volume_info)
1bfe73c2 3436{
b946845a 3437 kfree(volume_info->username);
1bfe73c2 3438 kzfree(volume_info->password);
95c75454 3439 kfree(volume_info->UNC);
b946845a
SF		 3440 kfree(volume_info->domainname);
3441 kfree(volume_info->iocharset);
1bfe73c2 3442 kfree(volume_info->prepath);
b9bce2e9
JL		 3443}
3444
3445void
3446cifs_cleanup_volume_info(struct smb_vol *volume_info)
3447{
3448 if (!volume_info)
3449 return;
3450 cleanup_volume_info_contents(volume_info);
1bfe73c2 3451 kfree(volume_info);
1bfe73c2
IM		 3452}
3453
b9bce2e9 3454
2d6d589d 3455#ifdef CONFIG_CIFS_DFS_UPCALL
6d3ea7e4
SF		 3456/*
3457 * cifs_build_path_to_root returns full path to root when we do not have an
3458 * exiting connection (tcon)
3459 */
1bfe73c2 3460static char *
b2a0fa15 3461build_unc_path_to_root(const struct smb_vol *vol,
1bfe73c2
IM		 3462 const struct cifs_sb_info *cifs_sb)
3463{
b2a0fa15 3464 char *full_path, *pos;
839db3d1 3465 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
b2a0fa15 3466 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
1bfe73c2 3467
b2a0fa15 3468 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
1bfe73c2
IM		 3469 if (full_path == NULL)
3470 return ERR_PTR(-ENOMEM);
3471
b2a0fa15
JL		 3472 strncpy(full_path, vol->UNC, unc_len);
3473 pos = full_path + unc_len;
3474
3475 if (pplen) {
1fc29bac
JL		 3476 *pos = CIFS_DIR_SEP(cifs_sb);
3477 strncpy(pos + 1, vol->prepath, pplen);
b2a0fa15
JL		 3478 pos += pplen;
3479 }
3480
3481 *pos = '\0'; /* add trailing null */
f87d39d9 3482 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
f96637be 3483 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
1bfe73c2
IM		 3484 return full_path;
3485}
dd613945
SF		 3486
3487/*
3488 * Perform a dfs referral query for a share and (optionally) prefix
3489 *
046462ab
SF		 3490 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3491 * to a string containing updated options for the submount. Otherwise it
3492 * will be left untouched.
dd613945
SF		 3493 *
3494 * Returns the rc from get_dfs_path to the caller, which can be used to
3495 * determine whether there were referrals.
3496 */
3497static int
b669f33c 3498expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
dd613945 3499 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
046462ab 3500 int check_prefix)
dd613945
SF		 3501{
3502 int rc;
3503 unsigned int num_referrals = 0;
3504 struct dfs_info3_param *referrals = NULL;
3505 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3506
3507 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3508 if (IS_ERR(full_path))
3509 return PTR_ERR(full_path);
3510
3511 /* For DFS paths, skip the first '\' of the UNC */
3512 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3513
b669f33c 3514 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
2baa2682 3515 &num_referrals, &referrals, cifs_remap(cifs_sb));
dd613945
SF		 3516
3517 if (!rc && num_referrals > 0) {
3518 char *fake_devname = NULL;
3519
3520 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3521 full_path + 1, referrals,
3522 &fake_devname);
3523
3524 free_dfs_info_array(referrals, num_referrals);
046462ab 3525
dd613945
SF		 3526 if (IS_ERR(mdata)) {
3527 rc = PTR_ERR(mdata);
3528 mdata = NULL;
b9bce2e9
JL		 3529 } else {
3530 cleanup_volume_info_contents(volume_info);
b9bce2e9
JL		 3531 rc = cifs_setup_volume_info(volume_info, mdata,
3532 fake_devname);
dd613945 3533 }
b9bce2e9
JL		 3534 kfree(fake_devname);
3535 kfree(cifs_sb->mountdata);
046462ab 3536 cifs_sb->mountdata = mdata;
dd613945
SF		 3537 }
3538 kfree(full_path);
3539 return rc;
3540}
2d6d589d 3541#endif
1bfe73c2 3542
04db79b0
JL		 3543static int
3544cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3545 const char *devname)
1da177e4 3546{
724d9f1c 3547 int rc = 0;
1da177e4 3548
04db79b0
JL		 3549 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3550 return -EINVAL;
1da177e4 3551
7586b765 3552 if (volume_info->nullauth) {
f96637be 3553 cifs_dbg(FYI, "Anonymous login\n");
04febabc
JL		 3554 kfree(volume_info->username);
3555 volume_info->username = NULL;
7586b765 3556 } else if (volume_info->username) {
1da177e4 3557 /* BB fixme parse for domain name here */
f96637be 3558 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
1da177e4 3559 } else {
f96637be 3560 cifs_dbg(VFS, "No username specified\n");
50c2f753
SF		 3561 /* In userspace mount helper we can get user name from alternate
3562 locations such as env variables and files on disk */
04db79b0 3563 return -EINVAL;
1da177e4
LT		 3564 }
3565
1da177e4 3566 /* this is needed for ASCII cp to Unicode converts */
7586b765 3567 if (volume_info->iocharset == NULL) {
a5fc4ce0
JL		 3568 /* load_nls_default cannot return null */
3569 volume_info->local_nls = load_nls_default();
1da177e4 3570 } else {
a5fc4ce0
JL		 3571 volume_info->local_nls = load_nls(volume_info->iocharset);
3572 if (volume_info->local_nls == NULL) {
f96637be 3573 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
b6b38f70 3574 volume_info->iocharset);
04db79b0 3575 return -ELIBACC;
1da177e4
LT		 3576 }
3577 }
724d9f1c 3578
724d9f1c
PS		 3579 return rc;
3580}
3581
04db79b0
JL		 3582struct smb_vol *
3583cifs_get_volume_info(char *mount_data, const char *devname)
3584{
3585 int rc;
3586 struct smb_vol *volume_info;
3587
6ee9542a 3588 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
04db79b0
JL		 3589 if (!volume_info)
3590 return ERR_PTR(-ENOMEM);
3591
3592 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3593 if (rc) {
3594 cifs_cleanup_volume_info(volume_info);
3595 volume_info = ERR_PTR(rc);
3596 }
3597
3598 return volume_info;
3599}
3600
a6b5058f
AA		 3601static int
3602cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3603 unsigned int xid,
3604 struct cifs_tcon *tcon,
3605 struct cifs_sb_info *cifs_sb,
3606 char *full_path)
3607{
3608 int rc;
3609 char *s;
3610 char sep, tmp;
3611
3612 sep = CIFS_DIR_SEP(cifs_sb);
3613 s = full_path;
3614
3615 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3616 while (rc == 0) {
3617 /* skip separators */
3618 while (*s == sep)
3619 s++;
3620 if (!*s)
3621 break;
3622 /* next separator */
3623 while (*s && *s != sep)
3624 s++;
3625
3626 /*
3627 * temporarily null-terminate the path at the end of
3628 * the current component
3629 */
3630 tmp = *s;
3631 *s = 0;
3632 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3633 full_path);
3634 *s = tmp;
3635 }
3636 return rc;
3637}
3638
724d9f1c 3639int
2c6292ae 3640cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
724d9f1c 3641{
1daaae8f 3642 int rc;
6d5786a3 3643 unsigned int xid;
af4281dc 3644 struct cifs_ses *ses;
96daf2b0 3645 struct cifs_tcon *tcon;
af4281dc 3646 struct TCP_Server_Info *server;
724d9f1c
PS		 3647 char *full_path;
3648 struct tcon_link *tlink;
3649#ifdef CONFIG_CIFS_DFS_UPCALL
3650 int referral_walks_count = 0;
20547490 3651#endif
dd854466 3652
b4caecd4 3653 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
dd854466
AV		 3654 if (rc)
3655 return rc;
3656
20547490 3657#ifdef CONFIG_CIFS_DFS_UPCALL
724d9f1c
PS		 3658try_mount_again:
3659 /* cleanup activities if we're chasing a referral */
3660 if (referral_walks_count) {
3661 if (tcon)
3662 cifs_put_tcon(tcon);
af4281dc
PS		 3663 else if (ses)
3664 cifs_put_smb_ses(ses);
724d9f1c 3665
1dfd18d0
SP		 3666 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3667
6d5786a3 3668 free_xid(xid);
724d9f1c
PS		 3669 }
3670#endif
1daaae8f 3671 rc = 0;
724d9f1c 3672 tcon = NULL;
af4281dc
PS		 3673 ses = NULL;
3674 server = NULL;
724d9f1c
PS		 3675 full_path = NULL;
3676 tlink = NULL;
3677
6d5786a3 3678 xid = get_xid();
1da177e4 3679
63c038c2 3680 /* get a reference to a tcp session */
af4281dc
PS		 3681 server = cifs_get_tcp_session(volume_info);
3682 if (IS_ERR(server)) {
3683 rc = PTR_ERR(server);
dd854466 3684 bdi_destroy(&cifs_sb->bdi);
63c038c2 3685 goto out;
1da177e4 3686 }
141891f4
SF		 3687 if ((volume_info->max_credits < 20) ||
3688 (volume_info->max_credits > 60000))
3689 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3690 else
3691 server->max_credits = volume_info->max_credits;
36988c76 3692 /* get a reference to a SMB session */
af4281dc
PS		 3693 ses = cifs_get_smb_ses(server, volume_info);
3694 if (IS_ERR(ses)) {
3695 rc = PTR_ERR(ses);
3696 ses = NULL;
36988c76 3697 goto mount_fail_check;
1da177e4 3698 }
50c2f753 3699
592fafe6 3700#ifdef CONFIG_CIFS_SMB2
b618f001
SF		 3701 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3702 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3703 cifs_dbg(VFS, "persistent handles not supported by server\n");
3704 rc = -EOPNOTSUPP;
3705 goto mount_fail_check;
3706 }
592fafe6
SF		 3707#endif /* CONFIG_CIFS_SMB2*/
3708
d00c28de 3709 /* search for existing tcon to this server share */
af4281dc 3710 tcon = cifs_get_tcon(ses, volume_info);
d00c28de
JL		 3711 if (IS_ERR(tcon)) {
3712 rc = PTR_ERR(tcon);
3713 tcon = NULL;
1bfe73c2 3714 goto remote_path_check;
d00c28de 3715 }
1bfe73c2 3716
d82c2df5 3717 /* tell server which Unix caps we support */
29e20f9c 3718 if (cap_unix(tcon->ses)) {
d82c2df5
SF		 3719 /* reset of caps checks mount to see if unix extensions
3720 disabled for just this mount */
2c6292ae 3721 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
6848b733
SF		 3722 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3723 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3724 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3725 rc = -EACCES;
3726 goto mount_fail_check;
3727 }
3728 } else
d82c2df5 3729 tcon->unix_ext = 0; /* server does not support them */
c18c842b 3730
af4281dc
PS		 3731 /* do not care if a following call succeed - informational */
3732 if (!tcon->ipc && server->ops->qfs_tcon)
3733 server->ops->qfs_tcon(xid, tcon);
6848b733 3734
24985c53
PS		 3735 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3736 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
f7910cbd 3737
66bfaadc 3738 /* tune readahead according to rsize */
09cbfeaf 3739 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
f7910cbd 3740
1bfe73c2 3741remote_path_check:
c1508ca2
SF		 3742#ifdef CONFIG_CIFS_DFS_UPCALL
3743 /*
3744 * Perform an unconditional check for whether there are DFS
3745 * referrals for this path without prefix, to provide support
3746 * for DFS referrals from w2k8 servers which don't seem to respond
3747 * with PATH_NOT_COVERED to requests that include the prefix.
3748 * Chase the referral if found, otherwise continue normally.
3749 */
3750 if (referral_walks_count == 0) {
af4281dc
PS		 3751 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3752 false);
c1508ca2
SF		 3753 if (!refrc) {
3754 referral_walks_count++;
3755 goto try_mount_again;
3756 }
3757 }
3758#endif
3759
f87d39d9 3760 /* check if a whole path is not remote */
70945643 3761 if (!rc && tcon) {
68889f26
PS		 3762 if (!server->ops->is_path_accessible) {
3763 rc = -ENOSYS;
3764 goto mount_fail_check;
3765 }
6d3ea7e4
SF		 3766 /*
3767 * cifs_build_path_to_root works only when we have a valid tcon
3768 */
374402a2
SP		 3769 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3770 tcon->Flags & SMB_SHARE_IS_IN_DFS);
e4cce94c
IM		 3771 if (full_path == NULL) {
3772 rc = -ENOMEM;
3773 goto mount_fail_check;
3774 }
68889f26
PS		 3775 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3776 full_path);
03ceace5 3777 if (rc != 0 && rc != -EREMOTE) {
e4cce94c
IM		 3778 kfree(full_path);
3779 goto mount_fail_check;
3780 }
a6b5058f 3781
d171356f
SP		 3782 if (rc != -EREMOTE) {
3783 rc = cifs_are_all_path_components_accessible(server,
a6b5058f
AA		 3784 xid, tcon, cifs_sb,
3785 full_path);
d171356f
SP		 3786 if (rc != 0) {
3787 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3788 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3789 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3790 rc = 0;
3791 }
a6b5058f 3792 }
e4cce94c
IM		 3793 kfree(full_path);
3794 }
3795
1bfe73c2
IM		 3796 /* get referral if needed */
3797 if (rc == -EREMOTE) {
d036f50f 3798#ifdef CONFIG_CIFS_DFS_UPCALL
5c2503a8
IM		 3799 if (referral_walks_count > MAX_NESTED_LINKS) {
3800 /*
3801 * BB: when we implement proper loop detection,
3802 * we will remove this check. But now we need it
3803 * to prevent an indefinite loop if 'DFS tree' is
3804 * misconfigured (i.e. has loops).
3805 */
3806 rc = -ELOOP;
3807 goto mount_fail_check;
3808 }
1bfe73c2 3809
af4281dc 3810 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
7b91e266 3811
dd613945 3812 if (!rc) {
5c2503a8 3813 referral_walks_count++;
1bfe73c2
IM		 3814 goto try_mount_again;
3815 }
dd613945 3816 goto mount_fail_check;
d036f50f
SF		 3817#else /* No DFS support, return error on mount */
3818 rc = -EOPNOTSUPP;
3819#endif
1bfe73c2
IM		 3820 }
3821
9d002df4
JL		 3822 if (rc)
3823 goto mount_fail_check;
3824
3825 /* now, hang the tcon off of the superblock */
3826 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3827 if (tlink == NULL) {
3828 rc = -ENOMEM;
3829 goto mount_fail_check;
3830 }
3831
af4281dc 3832 tlink->tl_uid = ses->linux_uid;
9d002df4
JL		 3833 tlink->tl_tcon = tcon;
3834 tlink->tl_time = jiffies;
3835 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3836 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3837
b647c35f 3838 cifs_sb->master_tlink = tlink;
9d002df4 3839 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 3840 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
9d002df4 3841 spin_unlock(&cifs_sb->tlink_tree_lock);
413e661c 3842
da472fc8 3843 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 3844 TLINK_IDLE_EXPIRE);
3845
1bfe73c2
IM		 3846mount_fail_check:
3847 /* on error free sesinfo and tcon struct if needed */
3848 if (rc) {
1bfe73c2 3849 /* If find_unc succeeded then rc == 0 so we can not end */
25985edc 3850 /* up accidentally freeing someone elses tcon struct */
1bfe73c2
IM		 3851 if (tcon)
3852 cifs_put_tcon(tcon);
af4281dc
PS		 3853 else if (ses)
3854 cifs_put_smb_ses(ses);
1bfe73c2 3855 else
53e0e11e 3856 cifs_put_tcp_session(server, 0);
dd854466 3857 bdi_destroy(&cifs_sb->bdi);
1bfe73c2
IM		 3858 }
3859
70fe7dc0 3860out:
6d5786a3 3861 free_xid(xid);
1da177e4
LT		 3862 return rc;
3863}
3864
8d1bca32
JL		 3865/*
3866 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3867 * pointer may be NULL.
3868 */
1da177e4 3869int
2e6e02ab 3870CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
96daf2b0 3871 const char *tree, struct cifs_tcon *tcon,
1da177e4
LT		 3872 const struct nls_table *nls_codepage)
3873{
3874 struct smb_hdr *smb_buffer;
3875 struct smb_hdr *smb_buffer_response;
3876 TCONX_REQ *pSMB;
3877 TCONX_RSP *pSMBr;
3878 unsigned char *bcc_ptr;
3879 int rc = 0;
690c522f
JL		 3880 int length;
3881 __u16 bytes_left, count;
1da177e4
LT		 3882
3883 if (ses == NULL)
3884 return -EIO;
3885
3886 smb_buffer = cifs_buf_get();
ca43e3be 3887 if (smb_buffer == NULL)
1da177e4 3888 return -ENOMEM;
ca43e3be 3889
1da177e4
LT		 3890 smb_buffer_response = smb_buffer;
3891
3892 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3893 NULL /*no tid */ , 4 /*wct */ );
1982c344 3894
88257360 3895 smb_buffer->Mid = get_next_mid(ses->server);
1da177e4
LT		 3896 smb_buffer->Uid = ses->Suid;
3897 pSMB = (TCONX_REQ *) smb_buffer;
3898 pSMBr = (TCONX_RSP *) smb_buffer_response;
3899
3900 pSMB->AndXCommand = 0xFF;
3901 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
1da177e4 3902 bcc_ptr = &pSMB->Password[0];
8d1bca32 3903 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
eeac8047 3904 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
7c7b25bc 3905 *bcc_ptr = 0; /* password is null byte */
eeac8047 3906 bcc_ptr++; /* skip password */
7c7b25bc 3907 /* already aligned so no need to do it below */
eeac8047 3908 } else {
540b2e37 3909 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
eeac8047
SF		 3910 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3911 specified as required (when that support is added to
3912 the vfs in the future) as only NTLM or the much
7c7b25bc 3913 weaker LANMAN (which we do not send by default) is accepted
eeac8047
SF		 3914 by Samba (not sure whether other servers allow
3915 NTLMv2 password here) */
7c7b25bc 3916#ifdef CONFIG_CIFS_WEAK_PW_HASH
04912d6a 3917 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3f618223 3918 (ses->sectype == LANMAN))
d3ba50b1 3919 calc_lanman_hash(tcon->password, ses->server->cryptkey,
96daf2b0 3920 ses->server->sec_mode &
4e53a3fb
JL		 3921 SECMODE_PW_ENCRYPT ? true : false,
3922 bcc_ptr);
7c7b25bc
SF		 3923 else
3924#endif /* CIFS_WEAK_PW_HASH */
ee2c9258 3925 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
9ef5992e 3926 bcc_ptr, nls_codepage);
f3a31a2b
SF		 3927 if (rc) {
3928 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3929 __func__, rc);
3930 cifs_buf_release(smb_buffer);
3931 return rc;
3932 }
eeac8047 3933
540b2e37 3934 bcc_ptr += CIFS_AUTH_RESP_SIZE;
fb8c4b14 3935 if (ses->capabilities & CAP_UNICODE) {
7c7b25bc
SF		 3936 /* must align unicode strings */
3937 *bcc_ptr = 0; /* null byte password */
3938 bcc_ptr++;
3939 }
eeac8047 3940 }
1da177e4 3941
38d77c50 3942 if (ses->server->sign)
1da177e4
LT		 3943 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3944
3945 if (ses->capabilities & CAP_STATUS32) {
3946 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3947 }
3948 if (ses->capabilities & CAP_DFS) {
3949 smb_buffer->Flags2 |= SMBFLG2_DFS;
3950 }
3951 if (ses->capabilities & CAP_UNICODE) {
3952 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3953 length =
acbbb76a 3954 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
50c2f753 3955 6 /* max utf8 char length in bytes */ *
a878fb22
SF		 3956 (/* server len*/ + 256 /* share len */), nls_codepage);
3957 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
1da177e4
LT		 3958 bcc_ptr += 2; /* skip trailing null */
3959 } else { /* ASCII */
1da177e4
LT		 3960 strcpy(bcc_ptr, tree);
3961 bcc_ptr += strlen(tree) + 1;
3962 }
3963 strcpy(bcc_ptr, "?????");
3964 bcc_ptr += strlen("?????");
3965 bcc_ptr += 1;
3966 count = bcc_ptr - &pSMB->Password[0];
be8e3b00
SF		 3967 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3968 pSMB->hdr.smb_buf_length) + count);
1da177e4
LT		 3969 pSMB->ByteCount = cpu_to_le16(count);
3970
133672ef 3971 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
7749981e 3972 0);
1da177e4 3973
1da177e4
LT		 3974 /* above now done in SendReceive */
3975 if ((rc == 0) && (tcon != NULL)) {
0e0d2cf3
SF		 3976 bool is_unicode;
3977
1da177e4 3978 tcon->tidStatus = CifsGood;
3b795210 3979 tcon->need_reconnect = false;
1da177e4
LT		 3980 tcon->tid = smb_buffer_response->Tid;
3981 bcc_ptr = pByteArea(smb_buffer_response);
690c522f 3982 bytes_left = get_bcc(smb_buffer_response);
cc20c031 3983 length = strnlen(bcc_ptr, bytes_left - 2);
0e0d2cf3
SF		 3984 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3985 is_unicode = true;
3986 else
3987 is_unicode = false;
3988
cc20c031 3989
50c2f753 3990 /* skip service field (NB: this field is always ASCII) */
7f8ed420
SF		 3991 if (length == 3) {
3992 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3993 (bcc_ptr[2] == 'C')) {
f96637be 3994 cifs_dbg(FYI, "IPC connection\n");
7f8ed420
SF		 3995 tcon->ipc = 1;
3996 }
3997 } else if (length == 2) {
3998 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3999 /* the most common case */
f96637be 4000 cifs_dbg(FYI, "disk share connection\n");
7f8ed420
SF		 4001 }
4002 }
50c2f753 4003 bcc_ptr += length + 1;
cc20c031 4004 bytes_left -= (length + 1);
46b51d08 4005 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
cc20c031
JL		 4006
4007 /* mostly informational -- no need to fail on error here */
90a98b2f 4008 kfree(tcon->nativeFileSystem);
acbbb76a 4009 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
0e0d2cf3 4010 bytes_left, is_unicode,
cc20c031
JL		 4011 nls_codepage);
4012
f96637be 4013 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
cc20c031 4014
fb8c4b14 4015 if ((smb_buffer_response->WordCount == 3) ||
1a4e15a0
SF		 4016 (smb_buffer_response->WordCount == 7))
4017 /* field is in same location */
3979877e
SF		 4018 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4019 else
4020 tcon->Flags = 0;
f96637be 4021 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
1da177e4 4022 } else if ((rc == 0) && tcon == NULL) {
50c2f753 4023 /* all we need to save for IPC$ connection */
1da177e4
LT		 4024 ses->ipc_tid = smb_buffer_response->Tid;
4025 }
4026
a8a11d39 4027 cifs_buf_release(smb_buffer);
1da177e4
LT		 4028 return rc;
4029}
4030
2e32cf5e
AV		 4031static void delayed_free(struct rcu_head *p)
4032{
4033 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4034 unload_nls(sbi->local_nls);
4035 kfree(sbi);
4036}
4037
2a9b9951
AV		 4038void
4039cifs_umount(struct cifs_sb_info *cifs_sb)
1da177e4 4040{
b647c35f
JL		 4041 struct rb_root *root = &cifs_sb->tlink_tree;
4042 struct rb_node *node;
4043 struct tcon_link *tlink;
9d002df4 4044
2de970ff
JL		 4045 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4046
b647c35f
JL		 4047 spin_lock(&cifs_sb->tlink_tree_lock);
4048 while ((node = rb_first(root))) {
4049 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4050 cifs_get_tlink(tlink);
4051 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4052 rb_erase(node, root);
1da177e4 4053
b647c35f
JL		 4054 spin_unlock(&cifs_sb->tlink_tree_lock);
4055 cifs_put_tlink(tlink);
4056 spin_lock(&cifs_sb->tlink_tree_lock);
4057 }
4058 spin_unlock(&cifs_sb->tlink_tree_lock);
50c2f753 4059
dd854466 4060 bdi_destroy(&cifs_sb->bdi);
d757d71b 4061 kfree(cifs_sb->mountdata);
a6b5058f 4062 kfree(cifs_sb->prepath);
2e32cf5e 4063 call_rcu(&cifs_sb->rcu, delayed_free);
50c2f753 4064}
1da177e4 4065
286170aa
PS		 4066int
4067cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
1da177e4
LT		 4068{
4069 int rc = 0;
198b5682 4070 struct TCP_Server_Info *server = ses->server;
1da177e4 4071
286170aa
PS		 4072 if (!server->ops->need_neg || !server->ops->negotiate)
4073 return -ENOSYS;
4074
198b5682 4075 /* only send once per connect */
286170aa 4076 if (!server->ops->need_neg(server))
198b5682
JL		 4077 return 0;
4078
45275789 4079 set_credits(server, 1);
286170aa
PS		 4080
4081 rc = server->ops->negotiate(xid, ses);
198b5682
JL		 4082 if (rc == 0) {
4083 spin_lock(&GlobalMid_Lock);
7fdbaa1b 4084 if (server->tcpStatus == CifsNeedNegotiate)
198b5682
JL		 4085 server->tcpStatus = CifsGood;
4086 else
4087 rc = -EHOSTDOWN;
4088 spin_unlock(&GlobalMid_Lock);
198b5682
JL		 4089 }
4090
4091 return rc;
4092}
4093
58c45c58
PS		 4094int
4095cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4096 struct nls_table *nls_info)
198b5682 4097{
58c45c58 4098 int rc = -ENOSYS;
198b5682 4099 struct TCP_Server_Info *server = ses->server;
26b994fa 4100
198b5682 4101 ses->capabilities = server->capabilities;
26b994fa 4102 if (linuxExtEnabled == 0)
29e20f9c 4103 ses->capabilities &= (~server->vals->cap_unix);
20418acd 4104
f96637be 4105 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
96daf2b0 4106 server->sec_mode, server->capabilities, server->timeAdj);
cb7691b6 4107
58c45c58
PS		 4108 if (server->ops->sess_setup)
4109 rc = server->ops->sess_setup(xid, ses, nls_info);
4110
d4e63bd6 4111 if (rc)
f96637be 4112 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
21e73393 4113
1da177e4
LT		 4114 return rc;
4115}
4116
8a8798a5
JL		 4117static int
4118cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4119{
3f618223
JL		 4120 vol->sectype = ses->sectype;
4121
4122 /* krb5 is special, since we don't need username or pw */
4123 if (vol->sectype == Kerberos)
8a8798a5 4124 return 0;
8a8798a5
JL		 4125
4126 return cifs_set_cifscreds(vol, ses);
4127}
4128
96daf2b0 4129static struct cifs_tcon *
6d4a0832 4130cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
9d002df4 4131{
8a8798a5 4132 int rc;
96daf2b0
SF		 4133 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4134 struct cifs_ses *ses;
4135 struct cifs_tcon *tcon = NULL;
9d002df4 4136 struct smb_vol *vol_info;
9d002df4
JL		 4137
4138 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
803ab977
DC		 4139 if (vol_info == NULL)
4140 return ERR_PTR(-ENOMEM);
9d002df4 4141
9d002df4
JL		 4142 vol_info->local_nls = cifs_sb->local_nls;
4143 vol_info->linux_uid = fsuid;
4144 vol_info->cred_uid = fsuid;
4145 vol_info->UNC = master_tcon->treeName;
4146 vol_info->retry = master_tcon->retry;
4147 vol_info->nocase = master_tcon->nocase;
4148 vol_info->local_lease = master_tcon->local_lease;
4149 vol_info->no_linux_ext = !master_tcon->unix_ext;
28e11bd8
JL		 4150 vol_info->sectype = master_tcon->ses->sectype;
4151 vol_info->sign = master_tcon->ses->sign;
9d002df4 4152
8a8798a5
JL		 4153 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4154 if (rc) {
4155 tcon = ERR_PTR(rc);
4156 goto out;
4157 }
9d002df4
JL		 4158
4159 /* get a reference for the same TCP session */
3f9bcca7 4160 spin_lock(&cifs_tcp_ses_lock);
9d002df4 4161 ++master_tcon->ses->server->srv_count;
3f9bcca7 4162 spin_unlock(&cifs_tcp_ses_lock);
9d002df4
JL		 4163
4164 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4165 if (IS_ERR(ses)) {
96daf2b0 4166 tcon = (struct cifs_tcon *)ses;
53e0e11e 4167 cifs_put_tcp_session(master_tcon->ses->server, 0);
9d002df4
JL		 4168 goto out;
4169 }
4170
4171 tcon = cifs_get_tcon(ses, vol_info);
4172 if (IS_ERR(tcon)) {
4173 cifs_put_smb_ses(ses);
4174 goto out;
4175 }
4176
29e20f9c 4177 if (cap_unix(ses))
9d002df4
JL		 4178 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4179out:
8a8798a5
JL		 4180 kfree(vol_info->username);
4181 kfree(vol_info->password);
9d002df4
JL		 4182 kfree(vol_info);
4183
4184 return tcon;
4185}
4186
96daf2b0 4187struct cifs_tcon *
9d002df4
JL		 4188cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4189{
4190 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4191}
4192
b647c35f
JL		 4193/* find and return a tlink with given uid */
4194static struct tcon_link *
6d4a0832 4195tlink_rb_search(struct rb_root *root, kuid_t uid)
b647c35f
JL		 4196{
4197 struct rb_node *node = root->rb_node;
4198 struct tcon_link *tlink;
4199
4200 while (node) {
4201 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4202
6d4a0832 4203 if (uid_gt(tlink->tl_uid, uid))
b647c35f 4204 node = node->rb_left;
6d4a0832 4205 else if (uid_lt(tlink->tl_uid, uid))
b647c35f
JL		 4206 node = node->rb_right;
4207 else
4208 return tlink;
4209 }
4210 return NULL;
4211}
4212
4213/* insert a tcon_link into the tree */
4214static void
4215tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4216{
4217 struct rb_node **new = &(root->rb_node), *parent = NULL;
4218 struct tcon_link *tlink;
4219
4220 while (*new) {
4221 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4222 parent = *new;
4223
6d4a0832 4224 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
b647c35f
JL		 4225 new = &((*new)->rb_left);
4226 else
4227 new = &((*new)->rb_right);
4228 }
4229
4230 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4231 rb_insert_color(&new_tlink->tl_rbnode, root);
4232}
4233
9d002df4
JL		 4234/*
4235 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4236 * current task.
4237 *
4238 * If the superblock doesn't refer to a multiuser mount, then just return
4239 * the master tcon for the mount.
4240 *
6ef933a3 4241 * First, search the rbtree for an existing tcon for this fsuid. If one
9d002df4
JL		 4242 * exists, then check to see if it's pending construction. If it is then wait
4243 * for construction to complete. Once it's no longer pending, check to see if
4244 * it failed and either return an error or retry construction, depending on
4245 * the timeout.
4246 *
4247 * If one doesn't exist then insert a new tcon_link struct into the tree and
4248 * try to construct a new one.
4249 */
4250struct tcon_link *
4251cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4252{
4253 int ret;
6d4a0832 4254 kuid_t fsuid = current_fsuid();
9d002df4
JL		 4255 struct tcon_link *tlink, *newtlink;
4256
4257 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4258 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4259
4260 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 4261 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4262 if (tlink)
4263 cifs_get_tlink(tlink);
4264 spin_unlock(&cifs_sb->tlink_tree_lock);
4265
4266 if (tlink == NULL) {
4267 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4268 if (newtlink == NULL)
4269 return ERR_PTR(-ENOMEM);
b647c35f 4270 newtlink->tl_uid = fsuid;
9d002df4
JL		 4271 newtlink->tl_tcon = ERR_PTR(-EACCES);
4272 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4273 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4274 cifs_get_tlink(newtlink);
4275
9d002df4
JL		 4276 spin_lock(&cifs_sb->tlink_tree_lock);
4277 /* was one inserted after previous search? */
b647c35f 4278 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4279 if (tlink) {
4280 cifs_get_tlink(tlink);
4281 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4282 kfree(newtlink);
4283 goto wait_for_construction;
4284 }
9d002df4 4285 tlink = newtlink;
b647c35f
JL		 4286 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4287 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4288 } else {
4289wait_for_construction:
4290 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
9d002df4
JL		 4291 TASK_INTERRUPTIBLE);
4292 if (ret) {
4293 cifs_put_tlink(tlink);
74316201 4294 return ERR_PTR(-ERESTARTSYS);
9d002df4
JL		 4295 }
4296
4297 /* if it's good, return it */
4298 if (!IS_ERR(tlink->tl_tcon))
4299 return tlink;
4300
4301 /* return error if we tried this already recently */
4302 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4303 cifs_put_tlink(tlink);
4304 return ERR_PTR(-EACCES);
4305 }
4306
4307 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4308 goto wait_for_construction;
4309 }
4310
4311 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4312 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4313 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4314
4315 if (IS_ERR(tlink->tl_tcon)) {
4316 cifs_put_tlink(tlink);
4317 return ERR_PTR(-EACCES);
4318 }
4319
4320 return tlink;
4321}
2de970ff
JL		 4322
4323/*
4324 * periodic workqueue job that scans tcon_tree for a superblock and closes
4325 * out tcons.
4326 */
4327static void
4328cifs_prune_tlinks(struct work_struct *work)
4329{
4330 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4331 prune_tlinks.work);
b647c35f
JL		 4332 struct rb_root *root = &cifs_sb->tlink_tree;
4333 struct rb_node *node = rb_first(root);
4334 struct rb_node *tmp;
4335 struct tcon_link *tlink;
2de970ff 4336
b647c35f
JL		 4337 /*
4338 * Because we drop the spinlock in the loop in order to put the tlink
4339 * it's not guarded against removal of links from the tree. The only
4340 * places that remove entries from the tree are this function and
4341 * umounts. Because this function is non-reentrant and is canceled
4342 * before umount can proceed, this is safe.
4343 */
4344 spin_lock(&cifs_sb->tlink_tree_lock);
4345 node = rb_first(root);
4346 while (node != NULL) {
4347 tmp = node;
4348 node = rb_next(tmp);
4349 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4350
4351 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4352 atomic_read(&tlink->tl_count) != 0 ||
4353 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4354 continue;
2de970ff 4355
b647c35f
JL		 4356 cifs_get_tlink(tlink);
4357 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4358 rb_erase(tmp, root);
4359
4360 spin_unlock(&cifs_sb->tlink_tree_lock);
4361 cifs_put_tlink(tlink);
4362 spin_lock(&cifs_sb->tlink_tree_lock);
4363 }
4364 spin_unlock(&cifs_sb->tlink_tree_lock);
2de970ff 4365
da472fc8 4366 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 4367 TLINK_IDLE_EXPIRE);
4368}
Linux 6.x block layer and io_uring tree(s)