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cifs: fix use-after-free bug in find_writable_file
[deliverable/linux.git] / fs / cifs / connect.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/cifs/connect.c
3 *
1080ef75 4 * Copyright (C) International Business Machines Corp., 2002,2011
1da177e4
LT		 5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
fb8c4b14 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1da177e4
LT		 20 */
21#include <linux/fs.h>
22#include <linux/net.h>
23#include <linux/string.h>
24#include <linux/list.h>
25#include <linux/wait.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4
LT		 27#include <linux/pagemap.h>
28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/mempool.h>
b8643e1b 31#include <linux/delay.h>
f191401f 32#include <linux/completion.h>
aaf737ad 33#include <linux/kthread.h>
0ae0efad 34#include <linux/pagevec.h>
7dfb7103 35#include <linux/freezer.h>
5c2503a8 36#include <linux/namei.h>
1da177e4
LT		 37#include <asm/uaccess.h>
38#include <asm/processor.h>
50b64e3b 39#include <linux/inet.h>
143cb494 40#include <linux/module.h>
8a8798a5 41#include <keys/user-type.h>
0e2bedaa 42#include <net/ipv6.h>
8830d7e0
SP		 43#include <linux/parser.h>
44
1da177e4
LT		 45#include "cifspdu.h"
46#include "cifsglob.h"
47#include "cifsproto.h"
48#include "cifs_unicode.h"
49#include "cifs_debug.h"
50#include "cifs_fs_sb.h"
51#include "ntlmssp.h"
52#include "nterr.h"
53#include "rfc1002pdu.h"
488f1d2d 54#include "fscache.h"
1da177e4
LT		 55
56#define CIFS_PORT 445
57#define RFC1001_PORT 139
58
1da177e4
LT		 59extern mempool_t *cifs_req_poolp;
60
2de970ff 61/* FIXME: should these be tunable? */
9d002df4 62#define TLINK_ERROR_EXPIRE (1 * HZ)
2de970ff 63#define TLINK_IDLE_EXPIRE (600 * HZ)
9d002df4 64
8830d7e0
SP		 65enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
72bd481f 70 Opt_forcegid, Opt_noforcegid,
8830d7e0
SP		 71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
2baa2682 73 Opt_mapposix, Opt_nomapposix,
8830d7e0
SP		 74 Opt_mapchars, Opt_nomapchars, Opt_sfu,
75 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
76 Opt_noposixpaths, Opt_nounix,
77 Opt_nocase,
78 Opt_brl, Opt_nobrl,
79 Opt_forcemandatorylock, Opt_setuids,
80 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
81 Opt_nohard, Opt_nosoft,
82 Opt_nointr, Opt_intr,
83 Opt_nostrictsync, Opt_strictsync,
84 Opt_serverino, Opt_noserverino,
85 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
86 Opt_acl, Opt_noacl, Opt_locallease,
1b359204 87 Opt_sign, Opt_seal, Opt_noac,
8830d7e0 88 Opt_fsc, Opt_mfsymlinks,
a0b3df5c 89 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
8830d7e0
SP		 90
91 /* Mount options which take numeric value */
92 Opt_backupuid, Opt_backupgid, Opt_uid,
93 Opt_cruid, Opt_gid, Opt_file_mode,
94 Opt_dirmode, Opt_port,
95 Opt_rsize, Opt_wsize, Opt_actimeo,
96
97 /* Mount options which take string value */
98 Opt_user, Opt_pass, Opt_ip,
73a999fa 99 Opt_domain, Opt_srcaddr, Opt_iocharset,
8830d7e0 100 Opt_netbiosname, Opt_servern,
23db65f5 101 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
8830d7e0
SP		 102
103 /* Mount options to be ignored */
104 Opt_ignore,
105
106 /* Options which could be blank */
107 Opt_blank_pass,
4fe9e963
SP		 108 Opt_blank_user,
109 Opt_blank_ip,
8830d7e0
SP		 110
111 Opt_err
112};
113
114static const match_table_t cifs_mount_option_tokens = {
115
116 { Opt_user_xattr, "user_xattr" },
117 { Opt_nouser_xattr, "nouser_xattr" },
118 { Opt_forceuid, "forceuid" },
119 { Opt_noforceuid, "noforceuid" },
72bd481f
JL		 120 { Opt_forcegid, "forcegid" },
121 { Opt_noforcegid, "noforcegid" },
8830d7e0
SP		 122 { Opt_noblocksend, "noblocksend" },
123 { Opt_noautotune, "noautotune" },
124 { Opt_hard, "hard" },
125 { Opt_soft, "soft" },
126 { Opt_perm, "perm" },
127 { Opt_noperm, "noperm" },
2baa2682 128 { Opt_mapchars, "mapchars" }, /* SFU style */
8830d7e0 129 { Opt_nomapchars, "nomapchars" },
2baa2682
SF		 130 { Opt_mapposix, "mapposix" }, /* SFM style */
131 { Opt_nomapposix, "nomapposix" },
8830d7e0
SP		 132 { Opt_sfu, "sfu" },
133 { Opt_nosfu, "nosfu" },
134 { Opt_nodfs, "nodfs" },
135 { Opt_posixpaths, "posixpaths" },
136 { Opt_noposixpaths, "noposixpaths" },
137 { Opt_nounix, "nounix" },
138 { Opt_nounix, "nolinux" },
139 { Opt_nocase, "nocase" },
140 { Opt_nocase, "ignorecase" },
141 { Opt_brl, "brl" },
142 { Opt_nobrl, "nobrl" },
143 { Opt_nobrl, "nolock" },
144 { Opt_forcemandatorylock, "forcemandatorylock" },
5cfdddcf 145 { Opt_forcemandatorylock, "forcemand" },
8830d7e0
SP		 146 { Opt_setuids, "setuids" },
147 { Opt_nosetuids, "nosetuids" },
148 { Opt_dynperm, "dynperm" },
149 { Opt_nodynperm, "nodynperm" },
150 { Opt_nohard, "nohard" },
151 { Opt_nosoft, "nosoft" },
152 { Opt_nointr, "nointr" },
153 { Opt_intr, "intr" },
154 { Opt_nostrictsync, "nostrictsync" },
155 { Opt_strictsync, "strictsync" },
156 { Opt_serverino, "serverino" },
157 { Opt_noserverino, "noserverino" },
158 { Opt_rwpidforward, "rwpidforward" },
159 { Opt_cifsacl, "cifsacl" },
160 { Opt_nocifsacl, "nocifsacl" },
161 { Opt_acl, "acl" },
162 { Opt_noacl, "noacl" },
163 { Opt_locallease, "locallease" },
164 { Opt_sign, "sign" },
165 { Opt_seal, "seal" },
8830d7e0
SP		 166 { Opt_noac, "noac" },
167 { Opt_fsc, "fsc" },
168 { Opt_mfsymlinks, "mfsymlinks" },
169 { Opt_multiuser, "multiuser" },
d8162558 170 { Opt_sloppy, "sloppy" },
a0b3df5c 171 { Opt_nosharesock, "nosharesock" },
8830d7e0
SP		 172
173 { Opt_backupuid, "backupuid=%s" },
174 { Opt_backupgid, "backupgid=%s" },
175 { Opt_uid, "uid=%s" },
176 { Opt_cruid, "cruid=%s" },
177 { Opt_gid, "gid=%s" },
178 { Opt_file_mode, "file_mode=%s" },
179 { Opt_dirmode, "dirmode=%s" },
180 { Opt_dirmode, "dir_mode=%s" },
181 { Opt_port, "port=%s" },
182 { Opt_rsize, "rsize=%s" },
183 { Opt_wsize, "wsize=%s" },
184 { Opt_actimeo, "actimeo=%s" },
185
4fe9e963
SP		 186 { Opt_blank_user, "user=" },
187 { Opt_blank_user, "username=" },
8830d7e0
SP		 188 { Opt_user, "user=%s" },
189 { Opt_user, "username=%s" },
190 { Opt_blank_pass, "pass=" },
3c15b4cf 191 { Opt_blank_pass, "password=" },
8830d7e0
SP		 192 { Opt_pass, "pass=%s" },
193 { Opt_pass, "password=%s" },
4fe9e963
SP		 194 { Opt_blank_ip, "ip=" },
195 { Opt_blank_ip, "addr=" },
8830d7e0
SP		 196 { Opt_ip, "ip=%s" },
197 { Opt_ip, "addr=%s" },
73a999fa
JL		 198 { Opt_ignore, "unc=%s" },
199 { Opt_ignore, "target=%s" },
200 { Opt_ignore, "path=%s" },
8830d7e0
SP		 201 { Opt_domain, "dom=%s" },
202 { Opt_domain, "domain=%s" },
203 { Opt_domain, "workgroup=%s" },
204 { Opt_srcaddr, "srcaddr=%s" },
73a999fa 205 { Opt_ignore, "prefixpath=%s" },
8830d7e0 206 { Opt_iocharset, "iocharset=%s" },
8830d7e0
SP		 207 { Opt_netbiosname, "netbiosname=%s" },
208 { Opt_servern, "servern=%s" },
209 { Opt_ver, "ver=%s" },
23db65f5 210 { Opt_vers, "vers=%s" },
8830d7e0 211 { Opt_sec, "sec=%s" },
15b6a473 212 { Opt_cache, "cache=%s" },
8830d7e0
SP		 213
214 { Opt_ignore, "cred" },
215 { Opt_ignore, "credentials" },
a557b976
JL		 216 { Opt_ignore, "cred=%s" },
217 { Opt_ignore, "credentials=%s" },
8830d7e0
SP		 218 { Opt_ignore, "guest" },
219 { Opt_ignore, "rw" },
220 { Opt_ignore, "ro" },
221 { Opt_ignore, "suid" },
222 { Opt_ignore, "nosuid" },
223 { Opt_ignore, "exec" },
224 { Opt_ignore, "noexec" },
225 { Opt_ignore, "nodev" },
226 { Opt_ignore, "noauto" },
227 { Opt_ignore, "dev" },
228 { Opt_ignore, "mand" },
229 { Opt_ignore, "nomand" },
230 { Opt_ignore, "_netdev" },
231
232 { Opt_err, NULL }
233};
234
235enum {
236 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
237 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
7659624f
JL		 238 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
239 Opt_sec_ntlmv2i, Opt_sec_lanman,
8830d7e0
SP		 240 Opt_sec_none,
241
242 Opt_sec_err
243};
244
245static const match_table_t cifs_secflavor_tokens = {
246 { Opt_sec_krb5, "krb5" },
247 { Opt_sec_krb5i, "krb5i" },
248 { Opt_sec_krb5p, "krb5p" },
249 { Opt_sec_ntlmsspi, "ntlmsspi" },
250 { Opt_sec_ntlmssp, "ntlmssp" },
251 { Opt_ntlm, "ntlm" },
252 { Opt_sec_ntlmi, "ntlmi" },
7659624f
JL		 253 { Opt_sec_ntlmv2, "nontlm" },
254 { Opt_sec_ntlmv2, "ntlmv2" },
8830d7e0 255 { Opt_sec_ntlmv2i, "ntlmv2i" },
8830d7e0
SP		 256 { Opt_sec_lanman, "lanman" },
257 { Opt_sec_none, "none" },
258
259 { Opt_sec_err, NULL }
260};
261
15b6a473
JL		 262/* cache flavors */
263enum {
264 Opt_cache_loose,
265 Opt_cache_strict,
266 Opt_cache_none,
267 Opt_cache_err
268};
269
270static const match_table_t cifs_cacheflavor_tokens = {
271 { Opt_cache_loose, "loose" },
272 { Opt_cache_strict, "strict" },
273 { Opt_cache_none, "none" },
274 { Opt_cache_err, NULL }
275};
276
23db65f5
JL		 277static const match_table_t cifs_smb_version_tokens = {
278 { Smb_1, SMB1_VERSION_STRING },
dd446b16 279 { Smb_20, SMB20_VERSION_STRING},
1080ef75 280 { Smb_21, SMB21_VERSION_STRING },
e4aa25e7 281 { Smb_30, SMB30_VERSION_STRING },
20b6d8b4 282 { Smb_302, SMB302_VERSION_STRING },
23db65f5
JL		 283};
284
a9f1b85e
PS		 285static int ip_connect(struct TCP_Server_Info *server);
286static int generic_ip_connect(struct TCP_Server_Info *server);
b647c35f 287static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
2de970ff 288static void cifs_prune_tlinks(struct work_struct *work);
b9bce2e9
JL		 289static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
290 const char *devname);
1da177e4 291
d5c5605c
JL		 292/*
293 * cifs tcp session reconnection
294 *
295 * mark tcp session as reconnecting so temporarily locked
296 * mark all smb sessions as reconnecting for tcp session
297 * reconnect tcp session
298 * wake up waiters on reconnection? - (not needed currently)
299 */
28ea5290 300int
1da177e4
LT		 301cifs_reconnect(struct TCP_Server_Info *server)
302{
303 int rc = 0;
f1987b44 304 struct list_head *tmp, *tmp2;
96daf2b0
SF		 305 struct cifs_ses *ses;
306 struct cifs_tcon *tcon;
fb8c4b14 307 struct mid_q_entry *mid_entry;
3c1105df 308 struct list_head retry_list;
50c2f753 309
1da177e4 310 spin_lock(&GlobalMid_Lock);
469ee614 311 if (server->tcpStatus == CifsExiting) {
fb8c4b14 312 /* the demux thread will exit normally
1da177e4
LT		 313 next time through the loop */
314 spin_unlock(&GlobalMid_Lock);
315 return rc;
316 } else
317 server->tcpStatus = CifsNeedReconnect;
318 spin_unlock(&GlobalMid_Lock);
319 server->maxBuf = 0;
aa24d1e9
PS		 320#ifdef CONFIG_CIFS_SMB2
321 server->max_read = 0;
322#endif
1da177e4 323
f96637be 324 cifs_dbg(FYI, "Reconnecting tcp session\n");
1da177e4
LT		 325
326 /* before reconnecting the tcp session, mark the smb session (uid)
327 and the tid bad so they are not used until reconnected */
f96637be
JP		 328 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
329 __func__);
3f9bcca7 330 spin_lock(&cifs_tcp_ses_lock);
14fbf50d 331 list_for_each(tmp, &server->smb_ses_list) {
96daf2b0 332 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
14fbf50d
JL		 333 ses->need_reconnect = true;
334 ses->ipc_tid = 0;
f1987b44 335 list_for_each(tmp2, &ses->tcon_list) {
96daf2b0 336 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
3b795210 337 tcon->need_reconnect = true;
1da177e4 338 }
1da177e4 339 }
3f9bcca7 340 spin_unlock(&cifs_tcp_ses_lock);
2b84a36c 341
1da177e4 342 /* do not want to be sending data on a socket we are freeing */
f96637be 343 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
72ca545b 344 mutex_lock(&server->srv_mutex);
fb8c4b14 345 if (server->ssocket) {
f96637be
JP		 346 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
347 server->ssocket->state, server->ssocket->flags);
91cf45f0 348 kernel_sock_shutdown(server->ssocket, SHUT_WR);
f96637be
JP		 349 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
350 server->ssocket->state, server->ssocket->flags);
1da177e4
LT		 351 sock_release(server->ssocket);
352 server->ssocket = NULL;
353 }
5d0d2882
SP		 354 server->sequence_number = 0;
355 server->session_estab = false;
21e73393
SP		 356 kfree(server->session_key.response);
357 server->session_key.response = NULL;
358 server->session_key.len = 0;
fda35943 359 server->lstrp = jiffies;
2b84a36c 360 mutex_unlock(&server->srv_mutex);
1da177e4 361
2b84a36c 362 /* mark submitted MIDs for retry and issue callback */
3c1105df 363 INIT_LIST_HEAD(&retry_list);
f96637be 364 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
1da177e4 365 spin_lock(&GlobalMid_Lock);
2b84a36c
JL		 366 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
367 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
7c9421e1
PS		 368 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
369 mid_entry->mid_state = MID_RETRY_NEEDED;
3c1105df
JL		 370 list_move(&mid_entry->qhead, &retry_list);
371 }
372 spin_unlock(&GlobalMid_Lock);
373
f96637be 374 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
3c1105df
JL		 375 list_for_each_safe(tmp, tmp2, &retry_list) {
376 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
2b84a36c
JL		 377 list_del_init(&mid_entry->qhead);
378 mid_entry->callback(mid_entry);
1da177e4 379 }
1da177e4 380
7fdbaa1b 381 do {
6c3d8909 382 try_to_freeze();
a9f1b85e
PS		 383
384 /* we should try only the port we connected to before */
73e216a8 385 mutex_lock(&server->srv_mutex);
a9f1b85e 386 rc = generic_ip_connect(server);
fb8c4b14 387 if (rc) {
f96637be 388 cifs_dbg(FYI, "reconnect error %d\n", rc);
0cb766ae 389 msleep(3000);
1da177e4
LT		 390 } else {
391 atomic_inc(&tcpSesReconnectCount);
392 spin_lock(&GlobalMid_Lock);
469ee614 393 if (server->tcpStatus != CifsExiting)
fd88ce93 394 server->tcpStatus = CifsNeedNegotiate;
fb8c4b14 395 spin_unlock(&GlobalMid_Lock);
1da177e4 396 }
73e216a8 397 mutex_unlock(&server->srv_mutex);
7fdbaa1b 398 } while (server->tcpStatus == CifsNeedReconnect);
2b84a36c 399
1da177e4
LT		 400 return rc;
401}
402
c74093b6
JL		 403static void
404cifs_echo_request(struct work_struct *work)
405{
406 int rc;
407 struct TCP_Server_Info *server = container_of(work,
408 struct TCP_Server_Info, echo.work);
409
247ec9b4 410 /*
f6d76178
PS		 411 * We cannot send an echo if it is disabled or until the
412 * NEGOTIATE_PROTOCOL request is done, which is indicated by
413 * server->ops->need_neg() == true. Also, no need to ping if
414 * we got a response recently.
247ec9b4 415 */
286170aa 416 if (!server->ops->need_neg || server->ops->need_neg(server) ||
f6d76178 417 (server->ops->can_echo && !server->ops->can_echo(server)) ||
247ec9b4 418 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
c74093b6
JL		 419 goto requeue_echo;
420
f6d76178 421 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
c74093b6 422 if (rc)
f96637be
JP		 423 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
424 server->hostname);
c74093b6
JL		 425
426requeue_echo:
da472fc8 427 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
c74093b6
JL		 428}
429
3d9c2472 430static bool
2a37ef94 431allocate_buffers(struct TCP_Server_Info *server)
3d9c2472 432{
2a37ef94
JL		 433 if (!server->bigbuf) {
434 server->bigbuf = (char *)cifs_buf_get();
435 if (!server->bigbuf) {
f96637be 436 cifs_dbg(VFS, "No memory for large SMB response\n");
3d9c2472
PS		 437 msleep(3000);
438 /* retry will check if exiting */
439 return false;
440 }
2a37ef94 441 } else if (server->large_buf) {
3d9c2472 442 /* we are reusing a dirty large buf, clear its start */
1887f601 443 memset(server->bigbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 444 }
445
2a37ef94
JL		 446 if (!server->smallbuf) {
447 server->smallbuf = (char *)cifs_small_buf_get();
448 if (!server->smallbuf) {
f96637be 449 cifs_dbg(VFS, "No memory for SMB response\n");
3d9c2472
PS		 450 msleep(1000);
451 /* retry will check if exiting */
452 return false;
453 }
454 /* beginning of smb buffer is cleared in our buf_get */
455 } else {
456 /* if existing small buf clear beginning */
1887f601 457 memset(server->smallbuf, 0, HEADER_SIZE(server));
3d9c2472
PS		 458 }
459
3d9c2472
PS		 460 return true;
461}
462
ba749e6d
JL		 463static bool
464server_unresponsive(struct TCP_Server_Info *server)
465{
6dae51a5
PS		 466 /*
467 * We need to wait 2 echo intervals to make sure we handle such
468 * situations right:
469 * 1s client sends a normal SMB request
470 * 2s client gets a response
471 * 30s echo workqueue job pops, and decides we got a response recently
472 * and don't need to send another
473 * ...
474 * 65s kernel_recvmsg times out, and we see that we haven't gotten
475 * a response in >60s.
476 */
477 if (server->tcpStatus == CifsGood &&
478 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
f96637be
JP		 479 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
480 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
ba749e6d
JL		 481 cifs_reconnect(server);
482 wake_up(&server->response_q);
483 return true;
484 }
485
486 return false;
487}
488
42c4dfc2
JL		 489/*
490 * kvec_array_init - clone a kvec array, and advance into it
491 * @new: pointer to memory for cloned array
492 * @iov: pointer to original array
493 * @nr_segs: number of members in original array
494 * @bytes: number of bytes to advance into the cloned array
495 *
496 * This function will copy the array provided in iov to a section of memory
497 * and advance the specified number of bytes into the new array. It returns
498 * the number of segments in the new array. "new" must be at least as big as
499 * the original iov array.
500 */
501static unsigned int
502kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
503 size_t bytes)
504{
505 size_t base = 0;
506
507 while (bytes || !iov->iov_len) {
508 int copy = min(bytes, iov->iov_len);
509
510 bytes -= copy;
511 base += copy;
512 if (iov->iov_len == base) {
513 iov++;
514 nr_segs--;
515 base = 0;
516 }
517 }
518 memcpy(new, iov, sizeof(*iov) * nr_segs);
519 new->iov_base += base;
520 new->iov_len -= base;
521 return nr_segs;
522}
523
1041e3f9
JL		 524static struct kvec *
525get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
e7015fb1 526{
1041e3f9
JL		 527 struct kvec *new_iov;
528
529 if (server->iov && nr_segs <= server->nr_iov)
530 return server->iov;
531
532 /* not big enough -- allocate a new one and release the old */
533 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
534 if (new_iov) {
535 kfree(server->iov);
536 server->iov = new_iov;
537 server->nr_iov = nr_segs;
538 }
539 return new_iov;
540}
541
e28bc5b1
JL		 542int
543cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
544 unsigned int nr_segs, unsigned int to_read)
e7015fb1 545{
a52c1eb7
JL		 546 int length = 0;
547 int total_read;
42c4dfc2 548 unsigned int segs;
e831e6cf 549 struct msghdr smb_msg;
42c4dfc2
JL		 550 struct kvec *iov;
551
1041e3f9 552 iov = get_server_iovec(server, nr_segs);
42c4dfc2
JL		 553 if (!iov)
554 return -ENOMEM;
e7015fb1 555
e831e6cf
JL		 556 smb_msg.msg_control = NULL;
557 smb_msg.msg_controllen = 0;
558
a52c1eb7 559 for (total_read = 0; to_read; total_read += length, to_read -= length) {
95edcff4
JL		 560 try_to_freeze();
561
ba749e6d 562 if (server_unresponsive(server)) {
3fabaa27 563 total_read = -ECONNABORTED;
ba749e6d
JL		 564 break;
565 }
566
42c4dfc2
JL		 567 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
568
569 length = kernel_recvmsg(server->ssocket, &smb_msg,
570 iov, segs, to_read, 0);
e7015fb1 571
e7015fb1 572 if (server->tcpStatus == CifsExiting) {
a52c1eb7 573 total_read = -ESHUTDOWN;
e7015fb1
PS		 574 break;
575 } else if (server->tcpStatus == CifsNeedReconnect) {
576 cifs_reconnect(server);
3fabaa27 577 total_read = -ECONNABORTED;
e7015fb1
PS		 578 break;
579 } else if (length == -ERESTARTSYS ||
580 length == -EAGAIN ||
581 length == -EINTR) {
582 /*
583 * Minimum sleep to prevent looping, allowing socket
584 * to clear and app threads to set tcpStatus
585 * CifsNeedReconnect if server hung.
586 */
587 usleep_range(1000, 2000);
588 length = 0;
a52c1eb7 589 continue;
e7015fb1 590 } else if (length <= 0) {
f96637be
JP		 591 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
592 "got %d", to_read, length);
e7015fb1 593 cifs_reconnect(server);
3fabaa27 594 total_read = -ECONNABORTED;
e7015fb1
PS		 595 break;
596 }
597 }
a52c1eb7 598 return total_read;
e7015fb1 599}
e7015fb1 600
e28bc5b1
JL		 601int
602cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
603 unsigned int to_read)
42c4dfc2
JL		 604{
605 struct kvec iov;
606
607 iov.iov_base = buf;
608 iov.iov_len = to_read;
609
e28bc5b1 610 return cifs_readv_from_socket(server, &iov, 1, to_read);
e7015fb1
PS		 611}
612
98bac62c 613static bool
fe11e4cc 614is_smb_response(struct TCP_Server_Info *server, unsigned char type)
98bac62c 615{
98bac62c
PS		 616 /*
617 * The first byte big endian of the length field,
618 * is actually not part of the length but the type
619 * with the most common, zero, as regular data.
620 */
fe11e4cc
JL		 621 switch (type) {
622 case RFC1002_SESSION_MESSAGE:
623 /* Regular SMB response */
624 return true;
625 case RFC1002_SESSION_KEEP_ALIVE:
f96637be 626 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
fe11e4cc
JL		 627 break;
628 case RFC1002_POSITIVE_SESSION_RESPONSE:
f96637be 629 cifs_dbg(FYI, "RFC 1002 positive session response\n");
fe11e4cc
JL		 630 break;
631 case RFC1002_NEGATIVE_SESSION_RESPONSE:
98bac62c
PS		 632 /*
633 * We get this from Windows 98 instead of an error on
634 * SMB negprot response.
635 */
f96637be 636 cifs_dbg(FYI, "RFC 1002 negative session response\n");
98bac62c
PS		 637 /* give server a second to clean up */
638 msleep(1000);
639 /*
640 * Always try 445 first on reconnect since we get NACK
641 * on some if we ever connected to port 139 (the NACK
642 * is since we do not begin with RFC1001 session
643 * initialize frame).
644 */
fe11e4cc 645 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
98bac62c
PS		 646 cifs_reconnect(server);
647 wake_up(&server->response_q);
fe11e4cc
JL		 648 break;
649 default:
f96637be 650 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
98bac62c 651 cifs_reconnect(server);
98bac62c
PS		 652 }
653
fe11e4cc 654 return false;
98bac62c
PS		 655}
656
e28bc5b1
JL		 657void
658dequeue_mid(struct mid_q_entry *mid, bool malformed)
ea1f4502 659{
ad69bae1 660#ifdef CONFIG_CIFS_STATS2
ea1f4502 661 mid->when_received = jiffies;
ad69bae1 662#endif
ea1f4502
JL		 663 spin_lock(&GlobalMid_Lock);
664 if (!malformed)
7c9421e1 665 mid->mid_state = MID_RESPONSE_RECEIVED;
ea1f4502 666 else
7c9421e1 667 mid->mid_state = MID_RESPONSE_MALFORMED;
ea1f4502 668 list_del_init(&mid->qhead);
ad69bae1 669 spin_unlock(&GlobalMid_Lock);
ea1f4502 670}
ad69bae1 671
c8054ebd
JL		 672static void
673handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
d4e4854f 674 char *buf, int malformed)
ea1f4502 675{
316cf94a
PS		 676 if (server->ops->check_trans2 &&
677 server->ops->check_trans2(mid, server, buf, malformed))
c8054ebd 678 return;
ea1f4502 679 mid->resp_buf = buf;
7c9421e1 680 mid->large_buf = server->large_buf;
2a37ef94
JL		 681 /* Was previous buf put in mpx struct for multi-rsp? */
682 if (!mid->multiRsp) {
683 /* smb buffer will be freed by user thread */
684 if (server->large_buf)
685 server->bigbuf = NULL;
686 else
687 server->smallbuf = NULL;
688 }
ffc00e27 689 dequeue_mid(mid, malformed);
ad69bae1
PS		 690}
691
762dfd10
PS		 692static void clean_demultiplex_info(struct TCP_Server_Info *server)
693{
694 int length;
695
696 /* take it off the list, if it's not already */
697 spin_lock(&cifs_tcp_ses_lock);
698 list_del_init(&server->tcp_ses_list);
699 spin_unlock(&cifs_tcp_ses_lock);
700
701 spin_lock(&GlobalMid_Lock);
702 server->tcpStatus = CifsExiting;
703 spin_unlock(&GlobalMid_Lock);
704 wake_up_all(&server->response_q);
705
2d86dbc9 706 /* check if we have blocked requests that need to free */
fc40f9cf 707 spin_lock(&server->req_lock);
2d86dbc9
PS		 708 if (server->credits <= 0)
709 server->credits = 1;
fc40f9cf 710 spin_unlock(&server->req_lock);
762dfd10
PS		 711 /*
712 * Although there should not be any requests blocked on this queue it
713 * can not hurt to be paranoid and try to wake up requests that may
714 * haven been blocked when more than 50 at time were on the wire to the
715 * same server - they now will see the session is in exit state and get
716 * out of SendReceive.
717 */
718 wake_up_all(&server->request_q);
719 /* give those requests time to exit */
720 msleep(125);
721
722 if (server->ssocket) {
723 sock_release(server->ssocket);
724 server->ssocket = NULL;
725 }
726
727 if (!list_empty(&server->pending_mid_q)) {
728 struct list_head dispose_list;
729 struct mid_q_entry *mid_entry;
730 struct list_head *tmp, *tmp2;
731
732 INIT_LIST_HEAD(&dispose_list);
733 spin_lock(&GlobalMid_Lock);
734 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
735 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 736 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
7c9421e1 737 mid_entry->mid_state = MID_SHUTDOWN;
762dfd10
PS		 738 list_move(&mid_entry->qhead, &dispose_list);
739 }
740 spin_unlock(&GlobalMid_Lock);
741
742 /* now walk dispose list and issue callbacks */
743 list_for_each_safe(tmp, tmp2, &dispose_list) {
744 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
f96637be 745 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
762dfd10
PS		 746 list_del_init(&mid_entry->qhead);
747 mid_entry->callback(mid_entry);
748 }
749 /* 1/8th of sec is more than enough time for them to exit */
750 msleep(125);
751 }
752
753 if (!list_empty(&server->pending_mid_q)) {
754 /*
755 * mpx threads have not exited yet give them at least the smb
756 * send timeout time for long ops.
757 *
758 * Due to delays on oplock break requests, we need to wait at
759 * least 45 seconds before giving up on a request getting a
760 * response and going ahead and killing cifsd.
761 */
f96637be 762 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
762dfd10
PS		 763 msleep(46000);
764 /*
765 * If threads still have not exited they are probably never
766 * coming home not much else we can do but free the memory.
767 */
768 }
769
770 kfree(server->hostname);
1041e3f9 771 kfree(server->iov);
762dfd10
PS		 772 kfree(server);
773
774 length = atomic_dec_return(&tcpSesAllocCount);
775 if (length > 0)
776 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
777 GFP_KERNEL);
778}
779
e9097ab4
JL		 780static int
781standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
782{
783 int length;
784 char *buf = server->smallbuf;
d4e4854f 785 unsigned int pdu_length = get_rfc1002_length(buf);
e9097ab4
JL		 786
787 /* make sure this will fit in a large buffer */
1887f601 788 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
f96637be 789 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
e9097ab4
JL		 790 cifs_reconnect(server);
791 wake_up(&server->response_q);
3fabaa27 792 return -ECONNABORTED;
e9097ab4
JL		 793 }
794
795 /* switch to large buffer if too big for a small one */
796 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
797 server->large_buf = true;
d4e4854f 798 memcpy(server->bigbuf, buf, server->total_read);
e9097ab4 799 buf = server->bigbuf;
e9097ab4
JL		 800 }
801
802 /* now read the rest */
1887f601
PS		 803 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
804 pdu_length - HEADER_SIZE(server) + 1 + 4);
e9097ab4
JL		 805 if (length < 0)
806 return length;
807 server->total_read += length;
808
d4e4854f 809 dump_smb(buf, server->total_read);
e9097ab4
JL		 810
811 /*
812 * We know that we received enough to get to the MID as we
813 * checked the pdu_length earlier. Now check to see
814 * if the rest of the header is OK. We borrow the length
815 * var for the rest of the loop to avoid a new stack var.
816 *
817 * 48 bytes is enough to display the header and a little bit
818 * into the payload for debugging purposes.
819 */
8aa26f3e 820 length = server->ops->check_message(buf, server->total_read);
e9097ab4
JL		 821 if (length != 0)
822 cifs_dump_mem("Bad SMB: ", buf,
823 min_t(unsigned int, server->total_read, 48));
824
2e44b288
PS		 825 if (server->ops->is_status_pending &&
826 server->ops->is_status_pending(buf, server, length))
827 return -1;
828
ff4fa4a2
JL		 829 if (!mid)
830 return length;
e9097ab4 831
d4e4854f 832 handle_mid(mid, server, buf, length);
ff4fa4a2 833 return 0;
e9097ab4
JL		 834}
835
1da177e4 836static int
7c97c200 837cifs_demultiplex_thread(void *p)
1da177e4
LT		 838{
839 int length;
7c97c200 840 struct TCP_Server_Info *server = p;
2a37ef94
JL		 841 unsigned int pdu_length;
842 char *buf = NULL;
a5c3e1c7 843 struct task_struct *task_to_wake = NULL;
1da177e4 844 struct mid_q_entry *mid_entry;
1da177e4 845
1da177e4 846 current->flags |= PF_MEMALLOC;
f96637be 847 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
93d0ec85
JL		 848
849 length = atomic_inc_return(&tcpSesAllocCount);
850 if (length > 1)
26f57364
SF		 851 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
852 GFP_KERNEL);
1da177e4 853
83144186 854 set_freezable();
469ee614 855 while (server->tcpStatus != CifsExiting) {
ede1327e
SF		 856 if (try_to_freeze())
857 continue;
b8643e1b 858
2a37ef94 859 if (!allocate_buffers(server))
3d9c2472 860 continue;
b8643e1b 861
2a37ef94 862 server->large_buf = false;
2a37ef94 863 buf = server->smallbuf;
f01d5e14 864 pdu_length = 4; /* enough to get RFC1001 header */
fda35943 865
e28bc5b1 866 length = cifs_read_from_socket(server, buf, pdu_length);
a52c1eb7 867 if (length < 0)
1da177e4 868 continue;
2a37ef94 869 server->total_read = length;
1da177e4 870
98bac62c
PS		 871 /*
872 * The right amount was read from socket - 4 bytes,
873 * so we can now interpret the length field.
874 */
d4e4854f 875 pdu_length = get_rfc1002_length(buf);
70ca734a 876
f96637be 877 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
fe11e4cc 878 if (!is_smb_response(server, buf[0]))
fb8c4b14 879 continue;
e4eb295d 880
89482a56 881 /* make sure we have enough to get to the MID */
1887f601 882 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
f96637be
JP		 883 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
884 pdu_length);
89482a56
JL		 885 cifs_reconnect(server);
886 wake_up(&server->response_q);
887 continue;
e4eb295d 888 }
e7015fb1 889
89482a56 890 /* read down to the MID */
e28bc5b1 891 length = cifs_read_from_socket(server, buf + 4,
1887f601 892 HEADER_SIZE(server) - 1 - 4);
89482a56 893 if (length < 0)
e4eb295d 894 continue;
2a37ef94 895 server->total_read += length;
1da177e4 896
8aa26f3e 897 mid_entry = server->ops->find_mid(server, buf);
50c2f753 898
44d22d84
JL		 899 if (!mid_entry || !mid_entry->receive)
900 length = standard_receive3(server, mid_entry);
901 else
902 length = mid_entry->receive(server, mid_entry);
71823baf 903
e9097ab4 904 if (length < 0)
fe11e4cc 905 continue;
1da177e4 906
d4e4854f 907 if (server->large_buf)
2a37ef94 908 buf = server->bigbuf;
fda35943 909
fda35943 910 server->lstrp = jiffies;
2b84a36c 911 if (mid_entry != NULL) {
2a37ef94
JL		 912 if (!mid_entry->multiRsp || mid_entry->multiEnd)
913 mid_entry->callback(mid_entry);
7f0adb53
PS		 914 } else if (!server->ops->is_oplock_break ||
915 !server->ops->is_oplock_break(buf, server)) {
f96637be
JP		 916 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
917 atomic_read(&midCount));
1887f601
PS		 918 cifs_dump_mem("Received Data is: ", buf,
919 HEADER_SIZE(server));
3979877e 920#ifdef CONFIG_CIFS_DEBUG2
7f0adb53
PS		 921 if (server->ops->dump_detail)
922 server->ops->dump_detail(buf);
3979877e
SF		 923 cifs_dump_mids(server);
924#endif /* CIFS_DEBUG2 */
50c2f753 925
e4eb295d
SF		 926 }
927 } /* end while !EXITING */
928
fd62cb7e 929 /* buffer usually freed in free_mid - need to free it here on exit */
2a37ef94
JL		 930 cifs_buf_release(server->bigbuf);
931 if (server->smallbuf) /* no sense logging a debug message if NULL */
932 cifs_small_buf_release(server->smallbuf);
1da177e4 933
a5c3e1c7 934 task_to_wake = xchg(&server->tsk, NULL);
762dfd10 935 clean_demultiplex_info(server);
a5c3e1c7
SF		 936
937 /* if server->tsk was NULL then wait for a signal before exiting */
938 if (!task_to_wake) {
939 set_current_state(TASK_INTERRUPTIBLE);
940 while (!signal_pending(current)) {
941 schedule();
942 set_current_state(TASK_INTERRUPTIBLE);
943 }
944 set_current_state(TASK_RUNNING);
945 }
946
0468a2cf 947 module_put_and_exit(0);
1da177e4
LT		 948}
949
c359cf3c
JL		 950/* extract the host portion of the UNC string */
951static char *
952extract_hostname(const char *unc)
953{
954 const char *src;
955 char *dst, *delim;
956 unsigned int len;
957
958 /* skip double chars at beginning of string */
959 /* BB: check validity of these bytes? */
960 src = unc + 2;
961
962 /* delimiter between hostname and sharename is always '\\' now */
963 delim = strchr(src, '\\');
964 if (!delim)
965 return ERR_PTR(-EINVAL);
966
967 len = delim - src;
968 dst = kmalloc((len + 1), GFP_KERNEL);
969 if (dst == NULL)
970 return ERR_PTR(-ENOMEM);
971
972 memcpy(dst, src, len);
973 dst[len] = '\0';
974
975 return dst;
976}
977
8830d7e0
SP		 978static int get_option_ul(substring_t args[], unsigned long *option)
979{
980 int rc;
981 char *string;
982
983 string = match_strdup(args);
984 if (string == NULL)
985 return -ENOMEM;
bfa890a3 986 rc = kstrtoul(string, 0, option);
8830d7e0
SP		 987 kfree(string);
988
989 return rc;
990}
991
3da46565
EB		 992static int get_option_uid(substring_t args[], kuid_t *result)
993{
994 unsigned long value;
995 kuid_t uid;
996 int rc;
997
998 rc = get_option_ul(args, &value);
999 if (rc)
1000 return rc;
1001
1002 uid = make_kuid(current_user_ns(), value);
1003 if (!uid_valid(uid))
1004 return -EINVAL;
1005
1006 *result = uid;
1007 return 0;
1008}
1009
1010static int get_option_gid(substring_t args[], kgid_t *result)
1011{
1012 unsigned long value;
1013 kgid_t gid;
1014 int rc;
1015
1016 rc = get_option_ul(args, &value);
1017 if (rc)
1018 return rc;
1019
1020 gid = make_kgid(current_user_ns(), value);
1021 if (!gid_valid(gid))
1022 return -EINVAL;
1023
1024 *result = gid;
1025 return 0;
1026}
8830d7e0
SP		 1027
1028static int cifs_parse_security_flavors(char *value,
1029 struct smb_vol *vol)
1030{
1031
1032 substring_t args[MAX_OPT_ARGS];
1033
1e3cc57e
JL		 1034 /*
1035 * With mount options, the last one should win. Reset any existing
1036 * settings back to default.
1037 */
1038 vol->sectype = Unspecified;
1039 vol->sign = false;
1040
8830d7e0 1041 switch (match_token(value, cifs_secflavor_tokens, args)) {
3f618223
JL		 1042 case Opt_sec_krb5p:
1043 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1044 return 1;
1045 case Opt_sec_krb5i:
1046 vol->sign = true;
1047 /* Fallthrough */
8830d7e0 1048 case Opt_sec_krb5:
1e3cc57e 1049 vol->sectype = Kerberos;
8830d7e0 1050 break;
3f618223 1051 case Opt_sec_ntlmsspi:
1e3cc57e 1052 vol->sign = true;
3f618223 1053 /* Fallthrough */
8830d7e0 1054 case Opt_sec_ntlmssp:
1e3cc57e 1055 vol->sectype = RawNTLMSSP;
8830d7e0 1056 break;
3f618223 1057 case Opt_sec_ntlmi:
1e3cc57e 1058 vol->sign = true;
3f618223 1059 /* Fallthrough */
8830d7e0 1060 case Opt_ntlm:
1e3cc57e 1061 vol->sectype = NTLM;
8830d7e0 1062 break;
3f618223 1063 case Opt_sec_ntlmv2i:
1e3cc57e 1064 vol->sign = true;
3f618223 1065 /* Fallthrough */
7659624f 1066 case Opt_sec_ntlmv2:
1e3cc57e 1067 vol->sectype = NTLMv2;
8830d7e0
SP		 1068 break;
1069#ifdef CONFIG_CIFS_WEAK_PW_HASH
1070 case Opt_sec_lanman:
1e3cc57e 1071 vol->sectype = LANMAN;
8830d7e0
SP		 1072 break;
1073#endif
1074 case Opt_sec_none:
1075 vol->nullauth = 1;
1076 break;
1077 default:
f96637be 1078 cifs_dbg(VFS, "bad security option: %s\n", value);
8830d7e0
SP		 1079 return 1;
1080 }
1081
1082 return 0;
1083}
1084
15b6a473
JL		 1085static int
1086cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1087{
1088 substring_t args[MAX_OPT_ARGS];
1089
1090 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1091 case Opt_cache_loose:
1092 vol->direct_io = false;
1093 vol->strict_io = false;
1094 break;
1095 case Opt_cache_strict:
1096 vol->direct_io = false;
1097 vol->strict_io = true;
1098 break;
1099 case Opt_cache_none:
1100 vol->direct_io = true;
1101 vol->strict_io = false;
1102 break;
1103 default:
f96637be 1104 cifs_dbg(VFS, "bad cache= option: %s\n", value);
15b6a473
JL		 1105 return 1;
1106 }
1107 return 0;
1108}
1109
23db65f5
JL		 1110static int
1111cifs_parse_smb_version(char *value, struct smb_vol *vol)
1112{
1113 substring_t args[MAX_OPT_ARGS];
1114
1115 switch (match_token(value, cifs_smb_version_tokens, args)) {
1116 case Smb_1:
1117 vol->ops = &smb1_operations;
1118 vol->vals = &smb1_values;
1119 break;
1080ef75 1120#ifdef CONFIG_CIFS_SMB2
dd446b16 1121 case Smb_20:
53ef1016 1122 vol->ops = &smb20_operations;
dd446b16
SF		 1123 vol->vals = &smb20_values;
1124 break;
1080ef75
SF		 1125 case Smb_21:
1126 vol->ops = &smb21_operations;
1127 vol->vals = &smb21_values;
1128 break;
e4aa25e7 1129 case Smb_30:
38107d45 1130 vol->ops = &smb30_operations;
e4aa25e7
SF		 1131 vol->vals = &smb30_values;
1132 break;
20b6d8b4
SF		 1133 case Smb_302:
1134 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1135 vol->vals = &smb302_values;
1136 break;
1080ef75 1137#endif
23db65f5 1138 default:
f96637be 1139 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
23db65f5
JL		 1140 return 1;
1141 }
1142 return 0;
1143}
1144
d387a5c5
JL		 1145/*
1146 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1147 * fields with the result. Returns 0 on success and an error otherwise.
1148 */
1149static int
1150cifs_parse_devname(const char *devname, struct smb_vol *vol)
1151{
1152 char *pos;
1153 const char *delims = "/\\";
1154 size_t len;
1155
1156 /* make sure we have a valid UNC double delimiter prefix */
1157 len = strspn(devname, delims);
1158 if (len != 2)
1159 return -EINVAL;
1160
1161 /* find delimiter between host and sharename */
1162 pos = strpbrk(devname + 2, delims);
1163 if (!pos)
1164 return -EINVAL;
1165
1166 /* skip past delimiter */
1167 ++pos;
1168
1169 /* now go until next delimiter or end of string */
1170 len = strcspn(pos, delims);
1171
1172 /* move "pos" up to delimiter or NULL */
1173 pos += len;
1174 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1175 if (!vol->UNC)
1176 return -ENOMEM;
1177
1178 convert_delimiter(vol->UNC, '\\');
1179
1180 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1181 if (!*pos++ || !*pos)
1182 return 0;
1183
1184 vol->prepath = kstrdup(pos, GFP_KERNEL);
1185 if (!vol->prepath)
1186 return -ENOMEM;
1187
1188 return 0;
1189}
1190
1da177e4 1191static int
b946845a 1192cifs_parse_mount_options(const char *mountdata, const char *devname,
50c2f753 1193 struct smb_vol *vol)
1da177e4 1194{
8830d7e0 1195 char *data, *end;
957df453 1196 char *mountdata_copy = NULL, *options;
1da177e4
LT		 1197 unsigned int temp_len, i, j;
1198 char separator[2];
9b9d6b24
JL		 1199 short int override_uid = -1;
1200 short int override_gid = -1;
1201 bool uid_specified = false;
1202 bool gid_specified = false;
d8162558
JL		 1203 bool sloppy = false;
1204 char *invalid = NULL;
88463999 1205 char *nodename = utsname()->nodename;
8830d7e0
SP		 1206 char *string = NULL;
1207 char *tmp_end, *value;
1208 char delim;
b979aaa1
JL		 1209 bool got_ip = false;
1210 unsigned short port = 0;
1211 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1da177e4
LT		 1212
1213 separator[0] = ',';
50c2f753 1214 separator[1] = 0;
8830d7e0 1215 delim = separator[0];
1da177e4 1216
6ee9542a
JL		 1217 /* ensure we always start with zeroed-out smb_vol */
1218 memset(vol, 0, sizeof(*vol));
1219
88463999
JL		 1220 /*
1221 * does not have to be perfect mapping since field is
1222 * informational, only used for servers that do not support
1223 * port 445 and it can be overridden at mount time
1224 */
1397f2ee
JL		 1225 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1226 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
88463999
JL		 1227 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1228
1397f2ee 1229 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
a10faeb2
SF		 1230 /* null target name indicates to use *SMBSERVR default called name
1231 if we end up sending RFC1001 session initialize */
1232 vol->target_rfc1001_name[0] = 0;
3e4b3e1f
JL		 1233 vol->cred_uid = current_uid();
1234 vol->linux_uid = current_uid();
a001e5b5 1235 vol->linux_gid = current_gid();
f55ed1a8 1236
2baa2682
SF		 1237 /*
1238 * default to SFM style remapping of seven reserved characters
1239 * unless user overrides it or we negotiate CIFS POSIX where
1240 * it is unnecessary. Can not simultaneously use more than one mapping
1241 * since then readdir could list files that open could not open
1242 */
1243 vol->remap = true;
1244
f55ed1a8
JL		 1245 /* default to only allowing write access to owner of the mount */
1246 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1da177e4
LT		 1247
1248 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
ac67055e
JA		 1249 /* default is always to request posix paths. */
1250 vol->posix_paths = 1;
a0c9217f
JL		 1251 /* default to using server inode numbers where available */
1252 vol->server_ino = 1;
ac67055e 1253
1b359204
JL		 1254 /* default is to use strict cifs caching semantics */
1255 vol->strict_io = true;
1256
6d20e840
SJ		 1257 vol->actimeo = CIFS_DEF_ACTIMEO;
1258
23db65f5
JL		 1259 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1260 vol->ops = &smb1_operations;
1261 vol->vals = &smb1_values;
1262
b946845a
SF		 1263 if (!mountdata)
1264 goto cifs_parse_mount_err;
1265
1266 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1267 if (!mountdata_copy)
1268 goto cifs_parse_mount_err;
1da177e4 1269
b946845a 1270 options = mountdata_copy;
4906e50b 1271 end = options + strlen(options);
8830d7e0 1272
50c2f753 1273 if (strncmp(options, "sep=", 4) == 0) {
fb8c4b14 1274 if (options[4] != 0) {
1da177e4
LT		 1275 separator[0] = options[4];
1276 options += 5;
1277 } else {
f96637be 1278 cifs_dbg(FYI, "Null separator not allowed\n");
1da177e4
LT		 1279 }
1280 }
3d3ea8e6
SP		 1281 vol->backupuid_specified = false; /* no backup intent for a user */
1282 vol->backupgid_specified = false; /* no backup intent for a group */
50c2f753 1283
37d4f99b
JL		 1284 switch (cifs_parse_devname(devname, vol)) {
1285 case 0:
1286 break;
1287 case -ENOMEM:
1288 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1289 goto cifs_parse_mount_err;
1290 case -EINVAL:
1291 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1292 goto cifs_parse_mount_err;
1293 default:
1294 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1295 goto cifs_parse_mount_err;
d387a5c5
JL		 1296 }
1297
1da177e4 1298 while ((data = strsep(&options, separator)) != NULL) {
8830d7e0
SP		 1299 substring_t args[MAX_OPT_ARGS];
1300 unsigned long option;
1301 int token;
1302
1da177e4
LT		 1303 if (!*data)
1304 continue;
1da177e4 1305
8830d7e0
SP		 1306 token = match_token(data, cifs_mount_option_tokens, args);
1307
1308 switch (token) {
1309
1310 /* Ingnore the following */
1311 case Opt_ignore:
1312 break;
1313
1314 /* Boolean values */
1315 case Opt_user_xattr:
1da177e4 1316 vol->no_xattr = 0;
8830d7e0
SP		 1317 break;
1318 case Opt_nouser_xattr:
1da177e4 1319 vol->no_xattr = 1;
8830d7e0
SP		 1320 break;
1321 case Opt_forceuid:
9b9d6b24 1322 override_uid = 1;
8830d7e0
SP		 1323 break;
1324 case Opt_noforceuid:
9b9d6b24 1325 override_uid = 0;
8830d7e0 1326 break;
72bd481f
JL		 1327 case Opt_forcegid:
1328 override_gid = 1;
1329 break;
1330 case Opt_noforcegid:
1331 override_gid = 0;
1332 break;
8830d7e0 1333 case Opt_noblocksend:
edf1ae40 1334 vol->noblocksnd = 1;
8830d7e0
SP		 1335 break;
1336 case Opt_noautotune:
edf1ae40 1337 vol->noautotune = 1;
8830d7e0
SP		 1338 break;
1339 case Opt_hard:
1da177e4 1340 vol->retry = 1;
8830d7e0
SP		 1341 break;
1342 case Opt_soft:
1da177e4 1343 vol->retry = 0;
8830d7e0
SP		 1344 break;
1345 case Opt_perm:
1da177e4 1346 vol->noperm = 0;
8830d7e0
SP		 1347 break;
1348 case Opt_noperm:
1da177e4 1349 vol->noperm = 1;
8830d7e0
SP		 1350 break;
1351 case Opt_mapchars:
2baa2682
SF		 1352 vol->sfu_remap = true;
1353 vol->remap = false; /* disable SFM mapping */
8830d7e0
SP		 1354 break;
1355 case Opt_nomapchars:
2baa2682
SF		 1356 vol->sfu_remap = false;
1357 break;
1358 case Opt_mapposix:
1359 vol->remap = true;
1360 vol->sfu_remap = false; /* disable SFU mapping */
1361 break;
1362 case Opt_nomapposix:
1363 vol->remap = false;
8830d7e0
SP		 1364 break;
1365 case Opt_sfu:
50c2f753 1366 vol->sfu_emul = 1;
8830d7e0
SP		 1367 break;
1368 case Opt_nosfu:
50c2f753 1369 vol->sfu_emul = 0;
8830d7e0
SP		 1370 break;
1371 case Opt_nodfs:
2c1b8615 1372 vol->nodfs = 1;
8830d7e0
SP		 1373 break;
1374 case Opt_posixpaths:
ac67055e 1375 vol->posix_paths = 1;
8830d7e0
SP		 1376 break;
1377 case Opt_noposixpaths:
ac67055e 1378 vol->posix_paths = 0;
8830d7e0
SP		 1379 break;
1380 case Opt_nounix:
c18c842b 1381 vol->no_linux_ext = 1;
8830d7e0
SP		 1382 break;
1383 case Opt_nocase:
50c2f753 1384 vol->nocase = 1;
8830d7e0
SP		 1385 break;
1386 case Opt_brl:
c46fa8ac 1387 vol->nobrl = 0;
8830d7e0
SP		 1388 break;
1389 case Opt_nobrl:
c46fa8ac 1390 vol->nobrl = 1;
5cfdddcf
PS		 1391 /*
1392 * turn off mandatory locking in mode
8830d7e0 1393 * if remote locking is turned off since the
5cfdddcf
PS		 1394 * local vfs will do advisory
1395 */
50c2f753
SF		 1396 if (vol->file_mode ==
1397 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
d3485d37 1398 vol->file_mode = S_IALLUGO;
8830d7e0
SP		 1399 break;
1400 case Opt_forcemandatorylock:
13a6e42a 1401 vol->mand_lock = 1;
8830d7e0
SP		 1402 break;
1403 case Opt_setuids:
1da177e4 1404 vol->setuids = 1;
8830d7e0
SP		 1405 break;
1406 case Opt_nosetuids:
1da177e4 1407 vol->setuids = 0;
8830d7e0
SP		 1408 break;
1409 case Opt_dynperm:
d0a9c078 1410 vol->dynperm = true;
8830d7e0
SP		 1411 break;
1412 case Opt_nodynperm:
d0a9c078 1413 vol->dynperm = false;
8830d7e0
SP		 1414 break;
1415 case Opt_nohard:
1da177e4 1416 vol->retry = 0;
8830d7e0
SP		 1417 break;
1418 case Opt_nosoft:
1da177e4 1419 vol->retry = 1;
8830d7e0
SP		 1420 break;
1421 case Opt_nointr:
1da177e4 1422 vol->intr = 0;
8830d7e0
SP		 1423 break;
1424 case Opt_intr:
1da177e4 1425 vol->intr = 1;
8830d7e0
SP		 1426 break;
1427 case Opt_nostrictsync:
be652445 1428 vol->nostrictsync = 1;
8830d7e0
SP		 1429 break;
1430 case Opt_strictsync:
be652445 1431 vol->nostrictsync = 0;
8830d7e0
SP		 1432 break;
1433 case Opt_serverino:
1da177e4 1434 vol->server_ino = 1;
8830d7e0
SP		 1435 break;
1436 case Opt_noserverino:
1da177e4 1437 vol->server_ino = 0;
8830d7e0
SP		 1438 break;
1439 case Opt_rwpidforward:
d4ffff1f 1440 vol->rwpidforward = 1;
8830d7e0
SP		 1441 break;
1442 case Opt_cifsacl:
0a4b92c0 1443 vol->cifs_acl = 1;
8830d7e0
SP		 1444 break;
1445 case Opt_nocifsacl:
0a4b92c0 1446 vol->cifs_acl = 0;
8830d7e0
SP		 1447 break;
1448 case Opt_acl:
1da177e4 1449 vol->no_psx_acl = 0;
8830d7e0
SP		 1450 break;
1451 case Opt_noacl:
1da177e4 1452 vol->no_psx_acl = 1;
8830d7e0
SP		 1453 break;
1454 case Opt_locallease:
84210e91 1455 vol->local_lease = 1;
8830d7e0
SP		 1456 break;
1457 case Opt_sign:
1e3cc57e 1458 vol->sign = true;
8830d7e0
SP		 1459 break;
1460 case Opt_seal:
95b1cb90 1461 /* we do not do the following in secFlags because seal
8830d7e0
SP		 1462 * is a per tree connection (mount) not a per socket
1463 * or per-smb connection option in the protocol
1464 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1465 */
95b1cb90 1466 vol->seal = 1;
8830d7e0 1467 break;
8830d7e0 1468 case Opt_noac:
0b456f04 1469 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
8830d7e0
SP		 1470 break;
1471 case Opt_fsc:
607a569d 1472#ifndef CONFIG_CIFS_FSCACHE
f96637be 1473 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
b946845a 1474 goto cifs_parse_mount_err;
607a569d 1475#endif
fa1df75d 1476 vol->fsc = true;
8830d7e0
SP		 1477 break;
1478 case Opt_mfsymlinks:
736a3320 1479 vol->mfsymlinks = true;
8830d7e0
SP		 1480 break;
1481 case Opt_multiuser:
0eb8a132 1482 vol->multiuser = true;
8830d7e0 1483 break;
d8162558
JL		 1484 case Opt_sloppy:
1485 sloppy = true;
1486 break;
a0b3df5c
JL		 1487 case Opt_nosharesock:
1488 vol->nosharesock = true;
1489 break;
8830d7e0
SP		 1490
1491 /* Numeric Values */
1492 case Opt_backupuid:
3da46565 1493 if (get_option_uid(args, &vol->backupuid)) {
f96637be
JP		 1494 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1495 __func__);
3d3ea8e6
SP		 1496 goto cifs_parse_mount_err;
1497 }
1498 vol->backupuid_specified = true;
8830d7e0
SP		 1499 break;
1500 case Opt_backupgid:
3da46565 1501 if (get_option_gid(args, &vol->backupgid)) {
f96637be
JP		 1502 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1503 __func__);
3d3ea8e6
SP		 1504 goto cifs_parse_mount_err;
1505 }
1506 vol->backupgid_specified = true;
8830d7e0
SP		 1507 break;
1508 case Opt_uid:
3da46565 1509 if (get_option_uid(args, &vol->linux_uid)) {
f96637be
JP		 1510 cifs_dbg(VFS, "%s: Invalid uid value\n",
1511 __func__);
8830d7e0
SP		 1512 goto cifs_parse_mount_err;
1513 }
8830d7e0
SP		 1514 uid_specified = true;
1515 break;
1516 case Opt_cruid:
3da46565 1517 if (get_option_uid(args, &vol->cred_uid)) {
f96637be
JP		 1518 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1519 __func__);
8830d7e0
SP		 1520 goto cifs_parse_mount_err;
1521 }
8830d7e0
SP		 1522 break;
1523 case Opt_gid:
3da46565 1524 if (get_option_gid(args, &vol->linux_gid)) {
f96637be
JP		 1525 cifs_dbg(VFS, "%s: Invalid gid value\n",
1526 __func__);
8830d7e0
SP		 1527 goto cifs_parse_mount_err;
1528 }
8830d7e0
SP		 1529 gid_specified = true;
1530 break;
1531 case Opt_file_mode:
1532 if (get_option_ul(args, &option)) {
f96637be
JP		 1533 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1534 __func__);
8830d7e0
SP		 1535 goto cifs_parse_mount_err;
1536 }
1537 vol->file_mode = option;
1538 break;
1539 case Opt_dirmode:
1540 if (get_option_ul(args, &option)) {
f96637be
JP		 1541 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1542 __func__);
8830d7e0
SP		 1543 goto cifs_parse_mount_err;
1544 }
1545 vol->dir_mode = option;
1546 break;
1547 case Opt_port:
b979aaa1
JL		 1548 if (get_option_ul(args, &option) ||
1549 option > USHRT_MAX) {
f96637be
JP		 1550 cifs_dbg(VFS, "%s: Invalid port value\n",
1551 __func__);
8830d7e0
SP		 1552 goto cifs_parse_mount_err;
1553 }
b979aaa1 1554 port = (unsigned short)option;
8830d7e0
SP		 1555 break;
1556 case Opt_rsize:
1557 if (get_option_ul(args, &option)) {
f96637be
JP		 1558 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1559 __func__);
b946845a 1560 goto cifs_parse_mount_err;
8830d7e0
SP		 1561 }
1562 vol->rsize = option;
1563 break;
1564 case Opt_wsize:
1565 if (get_option_ul(args, &option)) {
f96637be
JP		 1566 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1567 __func__);
8830d7e0
SP		 1568 goto cifs_parse_mount_err;
1569 }
1570 vol->wsize = option;
1571 break;
1572 case Opt_actimeo:
1573 if (get_option_ul(args, &option)) {
f96637be
JP		 1574 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1575 __func__);
8830d7e0
SP		 1576 goto cifs_parse_mount_err;
1577 }
1578 vol->actimeo = HZ * option;
1579 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
f96637be 1580 cifs_dbg(VFS, "attribute cache timeout too large\n");
8830d7e0
SP		 1581 goto cifs_parse_mount_err;
1582 }
1583 break;
1584
1585 /* String Arguments */
1586
4fe9e963
SP		 1587 case Opt_blank_user:
1588 /* null user, ie. anonymous authentication */
1589 vol->nullauth = 1;
1590 vol->username = NULL;
1591 break;
8830d7e0
SP		 1592 case Opt_user:
1593 string = match_strdup(args);
1594 if (string == NULL)
1595 goto out_nomem;
1596
8c3a2b4c
SL		 1597 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1598 CIFS_MAX_USERNAME_LEN) {
0b456f04 1599 pr_warn("CIFS: username too long\n");
8830d7e0
SP		 1600 goto cifs_parse_mount_err;
1601 }
1602 vol->username = kstrdup(string, GFP_KERNEL);
f96637be 1603 if (!vol->username)
8830d7e0 1604 goto cifs_parse_mount_err;
8830d7e0
SP		 1605 break;
1606 case Opt_blank_pass:
8830d7e0
SP		 1607 /* passwords have to be handled differently
1608 * to allow the character used for deliminator
1609 * to be passed within them
1610 */
1611
c369c9a4
SP		 1612 /*
1613 * Check if this is a case where the password
1614 * starts with a delimiter
1615 */
1616 tmp_end = strchr(data, '=');
1617 tmp_end++;
1618 if (!(tmp_end < end && tmp_end[1] == delim)) {
1619 /* No it is not. Set the password to NULL */
d6ccf499 1620 kfree(vol->password);
c369c9a4
SP		 1621 vol->password = NULL;
1622 break;
1623 }
1624 /* Yes it is. Drop down to Opt_pass below.*/
1625 case Opt_pass:
8830d7e0
SP		 1626 /* Obtain the value string */
1627 value = strchr(data, '=');
10238074 1628 value++;
8830d7e0
SP		 1629
1630 /* Set tmp_end to end of the string */
1631 tmp_end = (char *) value + strlen(value);
1632
1633 /* Check if following character is the deliminator
1634 * If yes, we have encountered a double deliminator
1635 * reset the NULL character to the deliminator
1636 */
e73f843a 1637 if (tmp_end < end && tmp_end[1] == delim) {
8830d7e0
SP		 1638 tmp_end[0] = delim;
1639
e73f843a
SJ		 1640 /* Keep iterating until we get to a single
1641 * deliminator OR the end
1642 */
1643 while ((tmp_end = strchr(tmp_end, delim))
1644 != NULL && (tmp_end[1] == delim)) {
1645 tmp_end = (char *) &tmp_end[2];
1646 }
1647
1648 /* Reset var options to point to next element */
1649 if (tmp_end) {
1650 tmp_end[0] = '\0';
1651 options = (char *) &tmp_end[1];
1652 } else
1653 /* Reached the end of the mount option
1654 * string */
1655 options = end;
8830d7e0
SP		 1656 }
1657
d6ccf499 1658 kfree(vol->password);
8830d7e0
SP		 1659 /* Now build new password string */
1660 temp_len = strlen(value);
1661 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1662 if (vol->password == NULL) {
0b456f04 1663 pr_warn("CIFS: no memory for password\n");
8830d7e0
SP		 1664 goto cifs_parse_mount_err;
1665 }
1666
1667 for (i = 0, j = 0; i < temp_len; i++, j++) {
1668 vol->password[j] = value[i];
1669 if ((value[i] == delim) &&
1670 value[i+1] == delim)
1671 /* skip the second deliminator */
1672 i++;
1673 }
1674 vol->password[j] = '\0';
1675 break;
4fe9e963 1676 case Opt_blank_ip:
b979aaa1
JL		 1677 /* FIXME: should this be an error instead? */
1678 got_ip = false;
4fe9e963 1679 break;
8830d7e0
SP		 1680 case Opt_ip:
1681 string = match_strdup(args);
1682 if (string == NULL)
1683 goto out_nomem;
1684
b979aaa1
JL		 1685 if (!cifs_convert_address(dstaddr, string,
1686 strlen(string))) {
0b456f04 1687 pr_err("CIFS: bad ip= option (%s).\n", string);
8830d7e0
SP		 1688 goto cifs_parse_mount_err;
1689 }
b979aaa1 1690 got_ip = true;
8830d7e0 1691 break;
8830d7e0
SP		 1692 case Opt_domain:
1693 string = match_strdup(args);
1694 if (string == NULL)
1695 goto out_nomem;
1696
057d6332
CG		 1697 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1698 == CIFS_MAX_DOMAINNAME_LEN) {
0b456f04 1699 pr_warn("CIFS: domain name too long\n");
8830d7e0
SP		 1700 goto cifs_parse_mount_err;
1701 }
1702
1703 vol->domainname = kstrdup(string, GFP_KERNEL);
1704 if (!vol->domainname) {
0b456f04 1705 pr_warn("CIFS: no memory for domainname\n");
8830d7e0
SP		 1706 goto cifs_parse_mount_err;
1707 }
f96637be 1708 cifs_dbg(FYI, "Domain name set\n");
8830d7e0
SP		 1709 break;
1710 case Opt_srcaddr:
1711 string = match_strdup(args);
1712 if (string == NULL)
1713 goto out_nomem;
1714
4fe9e963 1715 if (!cifs_convert_address(
8830d7e0
SP		 1716 (struct sockaddr *)&vol->srcaddr,
1717 string, strlen(string))) {
0b456f04
AS		 1718 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1719 string);
8830d7e0
SP		 1720 goto cifs_parse_mount_err;
1721 }
1722 break;
8830d7e0
SP		 1723 case Opt_iocharset:
1724 string = match_strdup(args);
1725 if (string == NULL)
1726 goto out_nomem;
1727
4fe9e963 1728 if (strnlen(string, 1024) >= 65) {
0b456f04 1729 pr_warn("CIFS: iocharset name too long.\n");
8830d7e0
SP		 1730 goto cifs_parse_mount_err;
1731 }
1732
87e747cd 1733 if (strncasecmp(string, "default", 7) != 0) {
8830d7e0
SP		 1734 vol->iocharset = kstrdup(string,
1735 GFP_KERNEL);
1736 if (!vol->iocharset) {
0b456f04 1737 pr_warn("CIFS: no memory for charset\n");
8830d7e0
SP		 1738 goto cifs_parse_mount_err;
1739 }
1740 }
1741 /* if iocharset not set then load_nls_default
1742 * is used by caller
1743 */
f96637be 1744 cifs_dbg(FYI, "iocharset set to %s\n", string);
8830d7e0 1745 break;
8830d7e0
SP		 1746 case Opt_netbiosname:
1747 string = match_strdup(args);
1748 if (string == NULL)
1749 goto out_nomem;
1750
8830d7e0
SP		 1751 memset(vol->source_rfc1001_name, 0x20,
1752 RFC1001_NAME_LEN);
1753 /*
1754 * FIXME: are there cases in which a comma can
1755 * be valid in workstation netbios name (and
1756 * need special handling)?
1757 */
1758 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1759 /* don't ucase netbiosname for user */
1760 if (string[i] == 0)
1761 break;
1762 vol->source_rfc1001_name[i] = string[i];
1763 }
1764 /* The string has 16th byte zero still from
1765 * set at top of the function
1766 */
1767 if (i == RFC1001_NAME_LEN && string[i] != 0)
0b456f04 1768 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
8830d7e0
SP		 1769 break;
1770 case Opt_servern:
1771 /* servernetbiosname specified override *SMBSERVER */
1772 string = match_strdup(args);
1773 if (string == NULL)
1774 goto out_nomem;
1775
8830d7e0
SP		 1776 /* last byte, type, is 0x20 for servr type */
1777 memset(vol->target_rfc1001_name, 0x20,
1778 RFC1001_NAME_LEN_WITH_NULL);
1779
1780 /* BB are there cases in which a comma can be
1781 valid in this workstation netbios name
1782 (and need special handling)? */
1783
1784 /* user or mount helper must uppercase the
1785 netbios name */
1786 for (i = 0; i < 15; i++) {
1787 if (string[i] == 0)
1788 break;
1789 vol->target_rfc1001_name[i] = string[i];
1790 }
1791 /* The string has 16th byte zero still from
1792 set at top of the function */
1793 if (i == RFC1001_NAME_LEN && string[i] != 0)
0b456f04 1794 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
8830d7e0
SP		 1795 break;
1796 case Opt_ver:
1797 string = match_strdup(args);
1798 if (string == NULL)
1799 goto out_nomem;
1800
87e747cd 1801 if (strncasecmp(string, "1", 1) == 0) {
8830d7e0
SP		 1802 /* This is the default */
1803 break;
1804 }
1805 /* For all other value, error */
0b456f04 1806 pr_warn("CIFS: Invalid version specified\n");
b946845a 1807 goto cifs_parse_mount_err;
23db65f5
JL		 1808 case Opt_vers:
1809 string = match_strdup(args);
1810 if (string == NULL)
1811 goto out_nomem;
1812
1813 if (cifs_parse_smb_version(string, vol) != 0)
1814 goto cifs_parse_mount_err;
1815 break;
8830d7e0
SP		 1816 case Opt_sec:
1817 string = match_strdup(args);
1818 if (string == NULL)
1819 goto out_nomem;
1820
8830d7e0
SP		 1821 if (cifs_parse_security_flavors(string, vol) != 0)
1822 goto cifs_parse_mount_err;
1823 break;
15b6a473
JL		 1824 case Opt_cache:
1825 string = match_strdup(args);
1826 if (string == NULL)
1827 goto out_nomem;
1828
1829 if (cifs_parse_cache_flavor(string, vol) != 0)
1830 goto cifs_parse_mount_err;
1831 break;
8830d7e0 1832 default:
d8162558
JL		 1833 /*
1834 * An option we don't recognize. Save it off for later
1835 * if we haven't already found one
1836 */
1837 if (!invalid)
1838 invalid = data;
8830d7e0 1839 break;
1da177e4 1840 }
8830d7e0
SP		 1841 /* Free up any allocated string */
1842 kfree(string);
1843 string = NULL;
1da177e4 1844 }
0eb8a132 1845
d8162558 1846 if (!sloppy && invalid) {
0b456f04 1847 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
d8162558
JL		 1848 goto cifs_parse_mount_err;
1849 }
1850
8a8798a5
JL		 1851#ifndef CONFIG_KEYS
1852 /* Muliuser mounts require CONFIG_KEYS support */
1853 if (vol->multiuser) {
f96637be 1854 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
b946845a 1855 goto cifs_parse_mount_err;
0eb8a132 1856 }
8a8798a5 1857#endif
e5e69abd 1858 if (!vol->UNC) {
37d4f99b 1859 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
e5e69abd
JL		 1860 goto cifs_parse_mount_err;
1861 }
0eb8a132 1862
62a1a439
JL		 1863 /* make sure UNC has a share name */
1864 if (!strchr(vol->UNC + 3, '\\')) {
f96637be 1865 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
62a1a439
JL		 1866 goto cifs_parse_mount_err;
1867 }
1868
b979aaa1
JL		 1869 if (!got_ip) {
1870 /* No ip= option specified? Try to get it from UNC */
1871 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1872 strlen(&vol->UNC[2]))) {
0b456f04 1873 pr_err("Unable to determine destination address.\n");
b979aaa1
JL		 1874 goto cifs_parse_mount_err;
1875 }
1876 }
1877
1878 /* set the port that we got earlier */
1879 cifs_set_port(dstaddr, port);
1da177e4 1880
9b9d6b24
JL		 1881 if (uid_specified)
1882 vol->override_uid = override_uid;
1883 else if (override_uid == 1)
0b456f04 1884 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
9b9d6b24
JL		 1885
1886 if (gid_specified)
1887 vol->override_gid = override_gid;
1888 else if (override_gid == 1)
0b456f04 1889 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
9b9d6b24 1890
b946845a 1891 kfree(mountdata_copy);
1da177e4 1892 return 0;
b946845a 1893
8830d7e0 1894out_nomem:
0b456f04 1895 pr_warn("Could not allocate temporary buffer\n");
b946845a 1896cifs_parse_mount_err:
8830d7e0 1897 kfree(string);
b946845a
SF		 1898 kfree(mountdata_copy);
1899 return 1;
1da177e4
LT		 1900}
1901
3eb9a889
BG		 1902/** Returns true if srcaddr isn't specified and rhs isn't
1903 * specified, or if srcaddr is specified and
1904 * matches the IP address of the rhs argument.
1905 */
1906static bool
1907srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1908{
1909 switch (srcaddr->sa_family) {
1910 case AF_UNSPEC:
1911 return (rhs->sa_family == AF_UNSPEC);
1912 case AF_INET: {
1913 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1914 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1915 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1916 }
1917 case AF_INET6: {
1918 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
e3e2775c 1919 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
3eb9a889
BG		 1920 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1921 }
1922 default:
1923 WARN_ON(1);
1924 return false; /* don't expect to be here */
1925 }
1926}
1927
4b886136
PS		 1928/*
1929 * If no port is specified in addr structure, we try to match with 445 port
1930 * and if it fails - with 139 ports. It should be called only if address
1931 * families of server and addr are equal.
1932 */
1933static bool
1934match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1935{
6da97910 1936 __be16 port, *sport;
4b886136
PS		 1937
1938 switch (addr->sa_family) {
1939 case AF_INET:
1940 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1941 port = ((struct sockaddr_in *) addr)->sin_port;
1942 break;
1943 case AF_INET6:
1944 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1945 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1946 break;
1947 default:
1948 WARN_ON(1);
1949 return false;
1950 }
1951
1952 if (!port) {
1953 port = htons(CIFS_PORT);
1954 if (port == *sport)
1955 return true;
1956
1957 port = htons(RFC1001_PORT);
1958 }
1959
1960 return port == *sport;
1961}
3eb9a889 1962
4515148e 1963static bool
3eb9a889
BG		 1964match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1965 struct sockaddr *srcaddr)
4515148e 1966{
4515148e 1967 switch (addr->sa_family) {
a9f1b85e
PS		 1968 case AF_INET: {
1969 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1970 struct sockaddr_in *srv_addr4 =
1971 (struct sockaddr_in *)&server->dstaddr;
1972
1973 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
4515148e 1974 return false;
4515148e 1975 break;
a9f1b85e
PS		 1976 }
1977 case AF_INET6: {
1978 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1979 struct sockaddr_in6 *srv_addr6 =
1980 (struct sockaddr_in6 *)&server->dstaddr;
1981
4515148e 1982 if (!ipv6_addr_equal(&addr6->sin6_addr,
a9f1b85e 1983 &srv_addr6->sin6_addr))
4515148e 1984 return false;
a9f1b85e 1985 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
4515148e 1986 return false;
4515148e
JL		 1987 break;
1988 }
a9f1b85e
PS		 1989 default:
1990 WARN_ON(1);
1991 return false; /* don't expect to be here */
1992 }
4515148e 1993
3eb9a889
BG		 1994 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1995 return false;
1996
4515148e
JL		 1997 return true;
1998}
1999
daf5b0b6
JL		 2000static bool
2001match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2002{
3f618223
JL		 2003 /*
2004 * The select_sectype function should either return the vol->sectype
2005 * that was specified, or "Unspecified" if that sectype was not
2006 * compatible with the given NEGOTIATE request.
2007 */
2008 if (select_sectype(server, vol->sectype) == Unspecified)
daf5b0b6 2009 return false;
daf5b0b6 2010
3f618223
JL		 2011 /*
2012 * Now check if signing mode is acceptable. No need to check
2013 * global_secflags at this point since if MUST_SIGN is set then
2014 * the server->sign had better be too.
2015 */
38d77c50
JL		 2016 if (vol->sign && !server->sign)
2017 return false;
daf5b0b6
JL		 2018
2019 return true;
2020}
2021
9fa114f7 2022static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
37bb04e5 2023{
9fa114f7
JL		 2024 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2025
a0b3df5c
JL		 2026 if (vol->nosharesock)
2027 return 0;
2028
23db65f5
JL		 2029 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2030 return 0;
2031
37bb04e5
PS		 2032 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2033 return 0;
2034
2035 if (!match_address(server, addr,
2036 (struct sockaddr *)&vol->srcaddr))
2037 return 0;
2038
2039 if (!match_port(server, addr))
2040 return 0;
2041
2042 if (!match_security(server, vol))
2043 return 0;
2044
2045 return 1;
2046}
2047
e7ddee90 2048static struct TCP_Server_Info *
9fa114f7 2049cifs_find_tcp_session(struct smb_vol *vol)
1da177e4 2050{
e7ddee90 2051 struct TCP_Server_Info *server;
e7ddee90 2052
3f9bcca7 2053 spin_lock(&cifs_tcp_ses_lock);
4515148e 2054 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
9fa114f7 2055 if (!match_server(server, vol))
daf5b0b6
JL		 2056 continue;
2057
e7ddee90 2058 ++server->srv_count;
3f9bcca7 2059 spin_unlock(&cifs_tcp_ses_lock);
f96637be 2060 cifs_dbg(FYI, "Existing tcp session with server found\n");
e7ddee90 2061 return server;
1da177e4 2062 }
3f9bcca7 2063 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2064 return NULL;
2065}
1b20d672 2066
14fbf50d 2067static void
e7ddee90 2068cifs_put_tcp_session(struct TCP_Server_Info *server)
1da177e4 2069{
a5c3e1c7
SF		 2070 struct task_struct *task;
2071
3f9bcca7 2072 spin_lock(&cifs_tcp_ses_lock);
e7ddee90 2073 if (--server->srv_count > 0) {
3f9bcca7 2074 spin_unlock(&cifs_tcp_ses_lock);
e7ddee90 2075 return;
1da177e4 2076 }
1b20d672 2077
f1d0c998
RL		 2078 put_net(cifs_net_ns(server));
2079
e7ddee90 2080 list_del_init(&server->tcp_ses_list);
3f9bcca7 2081 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2082
c74093b6
JL		 2083 cancel_delayed_work_sync(&server->echo);
2084
e7ddee90
JL		 2085 spin_lock(&GlobalMid_Lock);
2086 server->tcpStatus = CifsExiting;
2087 spin_unlock(&GlobalMid_Lock);
dea570e0 2088
d2b91521 2089 cifs_crypto_shash_release(server);
488f1d2d
SJ		 2090 cifs_fscache_release_client_cookie(server);
2091
21e73393
SP		 2092 kfree(server->session_key.response);
2093 server->session_key.response = NULL;
2094 server->session_key.len = 0;
a5c3e1c7
SF		 2095
2096 task = xchg(&server->tsk, NULL);
2097 if (task)
2098 force_sig(SIGKILL, task);
1da177e4
LT		 2099}
2100
63c038c2
JL		 2101static struct TCP_Server_Info *
2102cifs_get_tcp_session(struct smb_vol *volume_info)
2103{
2104 struct TCP_Server_Info *tcp_ses = NULL;
63c038c2
JL		 2105 int rc;
2106
f96637be 2107 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
63c038c2
JL		 2108
2109 /* see if we already have a matching tcp_ses */
9fa114f7 2110 tcp_ses = cifs_find_tcp_session(volume_info);
63c038c2
JL		 2111 if (tcp_ses)
2112 return tcp_ses;
2113
2114 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2115 if (!tcp_ses) {
2116 rc = -ENOMEM;
2117 goto out_err;
2118 }
2119
23db65f5
JL		 2120 tcp_ses->ops = volume_info->ops;
2121 tcp_ses->vals = volume_info->vals;
f1d0c998 2122 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
63c038c2
JL		 2123 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2124 if (IS_ERR(tcp_ses->hostname)) {
2125 rc = PTR_ERR(tcp_ses->hostname);
f7c5445a 2126 goto out_err_crypto_release;
63c038c2
JL		 2127 }
2128
2129 tcp_ses->noblocksnd = volume_info->noblocksnd;
2130 tcp_ses->noautotune = volume_info->noautotune;
6a5fa236 2131 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
fc40f9cf 2132 tcp_ses->in_flight = 0;
2d86dbc9 2133 tcp_ses->credits = 1;
63c038c2
JL		 2134 init_waitqueue_head(&tcp_ses->response_q);
2135 init_waitqueue_head(&tcp_ses->request_q);
2136 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2137 mutex_init(&tcp_ses->srv_mutex);
2138 memcpy(tcp_ses->workstation_RFC1001_name,
2139 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2140 memcpy(tcp_ses->server_RFC1001_name,
2141 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
5d0d2882 2142 tcp_ses->session_estab = false;
63c038c2 2143 tcp_ses->sequence_number = 0;
fda35943 2144 tcp_ses->lstrp = jiffies;
58fa015f 2145 spin_lock_init(&tcp_ses->req_lock);
63c038c2
JL		 2146 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2147 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
c74093b6 2148 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
9fa114f7
JL		 2149 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2150 sizeof(tcp_ses->srcaddr));
2151 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2152 sizeof(tcp_ses->dstaddr));
39552ea8
SP		 2153#ifdef CONFIG_CIFS_SMB2
2154 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2155#endif
63c038c2
JL		 2156 /*
2157 * at this point we are the only ones with the pointer
2158 * to the struct since the kernel thread not created yet
2159 * no need to spinlock this init of tcpStatus or srv_count
2160 */
2161 tcp_ses->tcpStatus = CifsNew;
2162 ++tcp_ses->srv_count;
2163
a9f1b85e 2164 rc = ip_connect(tcp_ses);
63c038c2 2165 if (rc < 0) {
f96637be 2166 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
f7c5445a 2167 goto out_err_crypto_release;
63c038c2
JL		 2168 }
2169
2170 /*
2171 * since we're in a cifs function already, we know that
2172 * this will succeed. No need for try_module_get().
2173 */
2174 __module_get(THIS_MODULE);
7c97c200 2175 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
63c038c2
JL		 2176 tcp_ses, "cifsd");
2177 if (IS_ERR(tcp_ses->tsk)) {
2178 rc = PTR_ERR(tcp_ses->tsk);
f96637be 2179 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
63c038c2 2180 module_put(THIS_MODULE);
f7c5445a 2181 goto out_err_crypto_release;
63c038c2 2182 }
fd88ce93 2183 tcp_ses->tcpStatus = CifsNeedNegotiate;
63c038c2
JL		 2184
2185 /* thread spawned, put it on the list */
3f9bcca7 2186 spin_lock(&cifs_tcp_ses_lock);
63c038c2 2187 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
3f9bcca7 2188 spin_unlock(&cifs_tcp_ses_lock);
63c038c2 2189
488f1d2d
SJ		 2190 cifs_fscache_get_client_cookie(tcp_ses);
2191
c74093b6 2192 /* queue echo request delayed work */
da472fc8 2193 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
c74093b6 2194
63c038c2
JL		 2195 return tcp_ses;
2196
f7c5445a 2197out_err_crypto_release:
d2b91521
SP		 2198 cifs_crypto_shash_release(tcp_ses);
2199
f1d0c998
RL		 2200 put_net(cifs_net_ns(tcp_ses));
2201
63c038c2
JL		 2202out_err:
2203 if (tcp_ses) {
8347a5cd
SF		 2204 if (!IS_ERR(tcp_ses->hostname))
2205 kfree(tcp_ses->hostname);
63c038c2
JL		 2206 if (tcp_ses->ssocket)
2207 sock_release(tcp_ses->ssocket);
2208 kfree(tcp_ses);
2209 }
2210 return ERR_PTR(rc);
2211}
2212
96daf2b0 2213static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
37bb04e5 2214{
3f618223
JL		 2215 if (vol->sectype != Unspecified &&
2216 vol->sectype != ses->sectype)
2217 return 0;
2218
2219 switch (ses->sectype) {
37bb04e5 2220 case Kerberos:
64ed39dd 2221 if (!uid_eq(vol->cred_uid, ses->cred_uid))
37bb04e5
PS		 2222 return 0;
2223 break;
2224 default:
04febabc
JL		 2225 /* NULL username means anonymous session */
2226 if (ses->user_name == NULL) {
2227 if (!vol->nullauth)
2228 return 0;
2229 break;
2230 }
2231
37bb04e5 2232 /* anything else takes username/password */
04febabc
JL		 2233 if (strncmp(ses->user_name,
2234 vol->username ? vol->username : "",
8c3a2b4c 2235 CIFS_MAX_USERNAME_LEN))
37bb04e5 2236 return 0;
08b37d51 2237 if ((vol->username && strlen(vol->username) != 0) &&
37bb04e5
PS		 2238 ses->password != NULL &&
2239 strncmp(ses->password,
2240 vol->password ? vol->password : "",
8c3a2b4c 2241 CIFS_MAX_PASSWORD_LEN))
37bb04e5
PS		 2242 return 0;
2243 }
2244 return 1;
2245}
2246
96daf2b0 2247static struct cifs_ses *
4ff67b72 2248cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1da177e4 2249{
96daf2b0 2250 struct cifs_ses *ses;
dea570e0 2251
3f9bcca7 2252 spin_lock(&cifs_tcp_ses_lock);
4ff67b72 2253 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
7f48558e
SP		 2254 if (ses->status == CifsExiting)
2255 continue;
37bb04e5
PS		 2256 if (!match_session(ses, vol))
2257 continue;
14fbf50d 2258 ++ses->ses_count;
3f9bcca7 2259 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2260 return ses;
2261 }
3f9bcca7 2262 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2263 return NULL;
2264}
dea570e0 2265
14fbf50d 2266static void
96daf2b0 2267cifs_put_smb_ses(struct cifs_ses *ses)
14fbf50d 2268{
7f48558e 2269 unsigned int rc, xid;
14fbf50d 2270 struct TCP_Server_Info *server = ses->server;
dea570e0 2271
f96637be 2272 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
7f48558e 2273
3f9bcca7 2274 spin_lock(&cifs_tcp_ses_lock);
7f48558e
SP		 2275 if (ses->status == CifsExiting) {
2276 spin_unlock(&cifs_tcp_ses_lock);
2277 return;
2278 }
14fbf50d 2279 if (--ses->ses_count > 0) {
3f9bcca7 2280 spin_unlock(&cifs_tcp_ses_lock);
14fbf50d
JL		 2281 return;
2282 }
7f48558e
SP		 2283 if (ses->status == CifsGood)
2284 ses->status = CifsExiting;
3f9bcca7 2285 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2286
7f48558e 2287 if (ses->status == CifsExiting && server->ops->logoff) {
6d5786a3 2288 xid = get_xid();
7f48558e
SP		 2289 rc = server->ops->logoff(xid, ses);
2290 if (rc)
2291 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2292 __func__, rc);
6d5786a3 2293 _free_xid(xid);
14fbf50d 2294 }
7f48558e
SP		 2295
2296 spin_lock(&cifs_tcp_ses_lock);
2297 list_del_init(&ses->smb_ses_list);
2298 spin_unlock(&cifs_tcp_ses_lock);
2299
14fbf50d
JL		 2300 sesInfoFree(ses);
2301 cifs_put_tcp_session(server);
2302}
dea570e0 2303
8a8798a5
JL		 2304#ifdef CONFIG_KEYS
2305
057d6332
CG		 2306/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2307#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
8a8798a5
JL		 2308
2309/* Populate username and pw fields from keyring if possible */
2310static int
2311cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2312{
2313 int rc = 0;
2314 char *desc, *delim, *payload;
2315 ssize_t len;
2316 struct key *key;
2317 struct TCP_Server_Info *server = ses->server;
2318 struct sockaddr_in *sa;
2319 struct sockaddr_in6 *sa6;
2320 struct user_key_payload *upayload;
2321
2322 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2323 if (!desc)
2324 return -ENOMEM;
2325
2326 /* try to find an address key first */
2327 switch (server->dstaddr.ss_family) {
2328 case AF_INET:
2329 sa = (struct sockaddr_in *)&server->dstaddr;
2330 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2331 break;
2332 case AF_INET6:
2333 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2334 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2335 break;
2336 default:
f96637be
JP		 2337 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2338 server->dstaddr.ss_family);
8a8798a5
JL		 2339 rc = -EINVAL;
2340 goto out_err;
2341 }
2342
f96637be 2343 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2344 key = request_key(&key_type_logon, desc, "");
2345 if (IS_ERR(key)) {
2346 if (!ses->domainName) {
f96637be 2347 cifs_dbg(FYI, "domainName is NULL\n");
8a8798a5
JL		 2348 rc = PTR_ERR(key);
2349 goto out_err;
2350 }
2351
2352 /* didn't work, try to find a domain key */
2353 sprintf(desc, "cifs:d:%s", ses->domainName);
f96637be 2354 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
8a8798a5
JL		 2355 key = request_key(&key_type_logon, desc, "");
2356 if (IS_ERR(key)) {
2357 rc = PTR_ERR(key);
2358 goto out_err;
2359 }
2360 }
2361
2362 down_read(&key->sem);
2363 upayload = key->payload.data;
2364 if (IS_ERR_OR_NULL(upayload)) {
4edc53c1 2365 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
8a8798a5
JL		 2366 goto out_key_put;
2367 }
2368
2369 /* find first : in payload */
2370 payload = (char *)upayload->data;
2371 delim = strnchr(payload, upayload->datalen, ':');
f96637be 2372 cifs_dbg(FYI, "payload=%s\n", payload);
8a8798a5 2373 if (!delim) {
f96637be
JP		 2374 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2375 upayload->datalen);
8a8798a5
JL		 2376 rc = -EINVAL;
2377 goto out_key_put;
2378 }
2379
2380 len = delim - payload;
8c3a2b4c 2381 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
f96637be
JP		 2382 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2383 len);
8a8798a5
JL		 2384 rc = -EINVAL;
2385 goto out_key_put;
2386 }
2387
2388 vol->username = kstrndup(payload, len, GFP_KERNEL);
2389 if (!vol->username) {
f96637be
JP		 2390 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2391 len);
8a8798a5
JL		 2392 rc = -ENOMEM;
2393 goto out_key_put;
2394 }
f96637be 2395 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
8a8798a5
JL		 2396
2397 len = key->datalen - (len + 1);
8c3a2b4c 2398 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
f96637be 2399 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
8a8798a5
JL		 2400 rc = -EINVAL;
2401 kfree(vol->username);
2402 vol->username = NULL;
2403 goto out_key_put;
2404 }
2405
2406 ++delim;
2407 vol->password = kstrndup(delim, len, GFP_KERNEL);
2408 if (!vol->password) {
f96637be
JP		 2409 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2410 len);
8a8798a5
JL		 2411 rc = -ENOMEM;
2412 kfree(vol->username);
2413 vol->username = NULL;
2414 goto out_key_put;
2415 }
2416
2417out_key_put:
2418 up_read(&key->sem);
2419 key_put(key);
2420out_err:
2421 kfree(desc);
f96637be 2422 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
8a8798a5
JL		 2423 return rc;
2424}
2425#else /* ! CONFIG_KEYS */
2426static inline int
2427cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2428 struct cifs_ses *ses __attribute__((unused)))
2429{
2430 return -ENOSYS;
2431}
2432#endif /* CONFIG_KEYS */
2433
96daf2b0 2434static struct cifs_ses *
36988c76
JL		 2435cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2436{
286170aa
PS		 2437 int rc = -ENOMEM;
2438 unsigned int xid;
96daf2b0 2439 struct cifs_ses *ses;
a9f1b85e
PS		 2440 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2441 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
36988c76 2442
6d5786a3 2443 xid = get_xid();
36988c76 2444
4ff67b72 2445 ses = cifs_find_smb_ses(server, volume_info);
36988c76 2446 if (ses) {
f96637be
JP		 2447 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2448 ses->status);
36988c76 2449
36988c76 2450 mutex_lock(&ses->session_mutex);
198b5682
JL		 2451 rc = cifs_negotiate_protocol(xid, ses);
2452 if (rc) {
2453 mutex_unlock(&ses->session_mutex);
2454 /* problem -- put our ses reference */
2455 cifs_put_smb_ses(ses);
6d5786a3 2456 free_xid(xid);
198b5682
JL		 2457 return ERR_PTR(rc);
2458 }
36988c76 2459 if (ses->need_reconnect) {
f96637be 2460 cifs_dbg(FYI, "Session needs reconnect\n");
36988c76
JL		 2461 rc = cifs_setup_session(xid, ses,
2462 volume_info->local_nls);
2463 if (rc) {
2464 mutex_unlock(&ses->session_mutex);
2465 /* problem -- put our reference */
2466 cifs_put_smb_ses(ses);
6d5786a3 2467 free_xid(xid);
36988c76
JL		 2468 return ERR_PTR(rc);
2469 }
2470 }
2471 mutex_unlock(&ses->session_mutex);
460cf341
JL		 2472
2473 /* existing SMB ses has a server reference already */
2474 cifs_put_tcp_session(server);
6d5786a3 2475 free_xid(xid);
36988c76
JL		 2476 return ses;
2477 }
2478
f96637be 2479 cifs_dbg(FYI, "Existing smb sess not found\n");
36988c76
JL		 2480 ses = sesInfoAlloc();
2481 if (ses == NULL)
2482 goto get_ses_fail;
2483
2484 /* new SMB session uses our server ref */
2485 ses->server = server;
a9f1b85e
PS		 2486 if (server->dstaddr.ss_family == AF_INET6)
2487 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
36988c76 2488 else
a9f1b85e 2489 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
36988c76 2490
8727c8a8
SF		 2491 if (volume_info->username) {
2492 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2493 if (!ses->user_name)
2494 goto get_ses_fail;
2495 }
36988c76
JL		 2496
2497 /* volume_info->password freed at unmount */
2498 if (volume_info->password) {
2499 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2500 if (!ses->password)
2501 goto get_ses_fail;
2502 }
2503 if (volume_info->domainname) {
d3686d54
SP		 2504 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2505 if (!ses->domainName)
2506 goto get_ses_fail;
36988c76 2507 }
3e4b3e1f 2508 ses->cred_uid = volume_info->cred_uid;
36988c76 2509 ses->linux_uid = volume_info->linux_uid;
d9b94201 2510
28e11bd8
JL		 2511 ses->sectype = volume_info->sectype;
2512 ses->sign = volume_info->sign;
36988c76
JL		 2513
2514 mutex_lock(&ses->session_mutex);
198b5682
JL		 2515 rc = cifs_negotiate_protocol(xid, ses);
2516 if (!rc)
2517 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
36988c76 2518 mutex_unlock(&ses->session_mutex);
c8e56f1f 2519 if (rc)
36988c76
JL		 2520 goto get_ses_fail;
2521
2522 /* success, put it on the list */
3f9bcca7 2523 spin_lock(&cifs_tcp_ses_lock);
36988c76 2524 list_add(&ses->smb_ses_list, &server->smb_ses_list);
3f9bcca7 2525 spin_unlock(&cifs_tcp_ses_lock);
36988c76 2526
6d5786a3 2527 free_xid(xid);
36988c76
JL		 2528 return ses;
2529
2530get_ses_fail:
2531 sesInfoFree(ses);
6d5786a3 2532 free_xid(xid);
36988c76
JL		 2533 return ERR_PTR(rc);
2534}
2535
96daf2b0 2536static int match_tcon(struct cifs_tcon *tcon, const char *unc)
37bb04e5
PS		 2537{
2538 if (tcon->tidStatus == CifsExiting)
2539 return 0;
2540 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2541 return 0;
2542 return 1;
2543}
2544
96daf2b0
SF		 2545static struct cifs_tcon *
2546cifs_find_tcon(struct cifs_ses *ses, const char *unc)
f1987b44
JL		 2547{
2548 struct list_head *tmp;
96daf2b0 2549 struct cifs_tcon *tcon;
f1987b44 2550
3f9bcca7 2551 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2552 list_for_each(tmp, &ses->tcon_list) {
96daf2b0 2553 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
37bb04e5 2554 if (!match_tcon(tcon, unc))
f1987b44 2555 continue;
f1987b44 2556 ++tcon->tc_count;
3f9bcca7 2557 spin_unlock(&cifs_tcp_ses_lock);
dea570e0 2558 return tcon;
1da177e4 2559 }
3f9bcca7 2560 spin_unlock(&cifs_tcp_ses_lock);
1da177e4
LT		 2561 return NULL;
2562}
2563
f1987b44 2564static void
96daf2b0 2565cifs_put_tcon(struct cifs_tcon *tcon)
f1987b44 2566{
2e6e02ab 2567 unsigned int xid;
96daf2b0 2568 struct cifs_ses *ses = tcon->ses;
f1987b44 2569
f96637be 2570 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3f9bcca7 2571 spin_lock(&cifs_tcp_ses_lock);
f1987b44 2572 if (--tcon->tc_count > 0) {
3f9bcca7 2573 spin_unlock(&cifs_tcp_ses_lock);
f1987b44
JL		 2574 return;
2575 }
2576
2577 list_del_init(&tcon->tcon_list);
3f9bcca7 2578 spin_unlock(&cifs_tcp_ses_lock);
f1987b44 2579
6d5786a3 2580 xid = get_xid();
2e6e02ab
PS		 2581 if (ses->server->ops->tree_disconnect)
2582 ses->server->ops->tree_disconnect(xid, tcon);
6d5786a3 2583 _free_xid(xid);
f1987b44 2584
d03382ce 2585 cifs_fscache_release_super_cookie(tcon);
9f841593 2586 tconInfoFree(tcon);
f1987b44
JL		 2587 cifs_put_smb_ses(ses);
2588}
2589
96daf2b0
SF		 2590static struct cifs_tcon *
2591cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
d00c28de
JL		 2592{
2593 int rc, xid;
96daf2b0 2594 struct cifs_tcon *tcon;
d00c28de
JL		 2595
2596 tcon = cifs_find_tcon(ses, volume_info->UNC);
2597 if (tcon) {
f96637be 2598 cifs_dbg(FYI, "Found match on UNC path\n");
d00c28de
JL		 2599 /* existing tcon already has a reference */
2600 cifs_put_smb_ses(ses);
2601 if (tcon->seal != volume_info->seal)
f96637be 2602 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
d00c28de
JL		 2603 return tcon;
2604 }
2605
2e6e02ab
PS		 2606 if (!ses->server->ops->tree_connect) {
2607 rc = -ENOSYS;
2608 goto out_fail;
2609 }
2610
d00c28de
JL		 2611 tcon = tconInfoAlloc();
2612 if (tcon == NULL) {
2613 rc = -ENOMEM;
2614 goto out_fail;
2615 }
2616
2617 tcon->ses = ses;
2618 if (volume_info->password) {
2619 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2620 if (!tcon->password) {
2621 rc = -ENOMEM;
2622 goto out_fail;
2623 }
2624 }
2625
2e6e02ab
PS		 2626 /*
2627 * BB Do we need to wrap session_mutex around this TCon call and Unix
2628 * SetFS as we do on SessSetup and reconnect?
2629 */
6d5786a3 2630 xid = get_xid();
2e6e02ab
PS		 2631 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2632 volume_info->local_nls);
6d5786a3 2633 free_xid(xid);
f96637be 2634 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
d00c28de
JL		 2635 if (rc)
2636 goto out_fail;
2637
2638 if (volume_info->nodfs) {
2639 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
f96637be 2640 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
d00c28de
JL		 2641 }
2642 tcon->seal = volume_info->seal;
2e6e02ab
PS		 2643 /*
2644 * We can have only one retry value for a connection to a share so for
2645 * resources mounted more than once to the same server share the last
2646 * value passed in for the retry flag is used.
2647 */
d00c28de
JL		 2648 tcon->retry = volume_info->retry;
2649 tcon->nocase = volume_info->nocase;
2650 tcon->local_lease = volume_info->local_lease;
233839b1 2651 INIT_LIST_HEAD(&tcon->pending_opens);
d00c28de 2652
3f9bcca7 2653 spin_lock(&cifs_tcp_ses_lock);
d00c28de 2654 list_add(&tcon->tcon_list, &ses->tcon_list);
3f9bcca7 2655 spin_unlock(&cifs_tcp_ses_lock);
d00c28de 2656
d03382ce
SJ		 2657 cifs_fscache_get_super_cookie(tcon);
2658
d00c28de
JL		 2659 return tcon;
2660
2661out_fail:
2662 tconInfoFree(tcon);
2663 return ERR_PTR(rc);
2664}
2665
9d002df4
JL		 2666void
2667cifs_put_tlink(struct tcon_link *tlink)
2668{
2669 if (!tlink || IS_ERR(tlink))
2670 return;
2671
2672 if (!atomic_dec_and_test(&tlink->tl_count) ||
2673 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2674 tlink->tl_time = jiffies;
2675 return;
2676 }
2677
2678 if (!IS_ERR(tlink_tcon(tlink)))
2679 cifs_put_tcon(tlink_tcon(tlink));
2680 kfree(tlink);
2681 return;
2682}
d00c28de 2683
25c7f41e 2684static inline struct tcon_link *
cd51875d
PS		 2685cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2686{
2687 return cifs_sb->master_tlink;
2688}
25c7f41e
PS		 2689
2690static int
2691compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2692{
2693 struct cifs_sb_info *old = CIFS_SB(sb);
2694 struct cifs_sb_info *new = mnt_data->cifs_sb;
2695
2696 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2697 return 0;
2698
2699 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2700 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2701 return 0;
2702
25c7f41e 2703 /*
5eba8ab3
JL		 2704 * We want to share sb only if we don't specify an r/wsize or
2705 * specified r/wsize is greater than or equal to existing one.
25c7f41e
PS		 2706 */
2707 if (new->wsize && new->wsize < old->wsize)
2708 return 0;
2709
5eba8ab3
JL		 2710 if (new->rsize && new->rsize < old->rsize)
2711 return 0;
2712
1f68233c 2713 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
25c7f41e
PS		 2714 return 0;
2715
2716 if (old->mnt_file_mode != new->mnt_file_mode ||
2717 old->mnt_dir_mode != new->mnt_dir_mode)
2718 return 0;
2719
2720 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2721 return 0;
2722
2723 if (old->actimeo != new->actimeo)
2724 return 0;
2725
2726 return 1;
2727}
2728
2729int
2730cifs_match_super(struct super_block *sb, void *data)
2731{
2732 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2733 struct smb_vol *volume_info;
2734 struct cifs_sb_info *cifs_sb;
2735 struct TCP_Server_Info *tcp_srv;
96daf2b0
SF		 2736 struct cifs_ses *ses;
2737 struct cifs_tcon *tcon;
25c7f41e 2738 struct tcon_link *tlink;
25c7f41e
PS		 2739 int rc = 0;
2740
25c7f41e
PS		 2741 spin_lock(&cifs_tcp_ses_lock);
2742 cifs_sb = CIFS_SB(sb);
2743 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2744 if (IS_ERR(tlink)) {
2745 spin_unlock(&cifs_tcp_ses_lock);
2746 return rc;
2747 }
2748 tcon = tlink_tcon(tlink);
2749 ses = tcon->ses;
2750 tcp_srv = ses->server;
2751
2752 volume_info = mnt_data->vol;
2753
9fa114f7 2754 if (!match_server(tcp_srv, volume_info) ||
25c7f41e
PS		 2755 !match_session(ses, volume_info) ||
2756 !match_tcon(tcon, volume_info->UNC)) {
2757 rc = 0;
2758 goto out;
2759 }
2760
2761 rc = compare_mount_options(sb, mnt_data);
2762out:
25c7f41e 2763 spin_unlock(&cifs_tcp_ses_lock);
f484b5d0 2764 cifs_put_tlink(tlink);
25c7f41e
PS		 2765 return rc;
2766}
2767
1da177e4 2768int
b669f33c 2769get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2e6e02ab
PS		 2770 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2771 struct dfs_info3_param **referrals, int remap)
1da177e4
LT		 2772{
2773 char *temp_unc;
2774 int rc = 0;
2775
b669f33c 2776 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2e6e02ab
PS		 2777 return -ENOSYS;
2778
2779 *num_referrals = 0;
2780 *referrals = NULL;
1da177e4 2781
2e6e02ab 2782 if (ses->ipc_tid == 0) {
1da177e4 2783 temp_unc = kmalloc(2 /* for slashes */ +
2e6e02ab
PS		 2784 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2785 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
1da177e4
LT		 2786 if (temp_unc == NULL)
2787 return -ENOMEM;
2788 temp_unc[0] = '\\';
2789 temp_unc[1] = '\\';
2e6e02ab
PS		 2790 strcpy(temp_unc + 2, ses->serverName);
2791 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2792 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2793 nls_codepage);
f96637be 2794 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
1da177e4
LT		 2795 kfree(temp_unc);
2796 }
2797 if (rc == 0)
b669f33c
PS		 2798 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2799 referrals, num_referrals,
2800 nls_codepage, remap);
2e6e02ab
PS		 2801 /*
2802 * BB - map targetUNCs to dfs_info3 structures, here or in
b669f33c 2803 * ses->server->ops->get_dfs_refer.
2e6e02ab 2804 */
1da177e4
LT		 2805
2806 return rc;
2807}
2808
09e50d55
JL		 2809#ifdef CONFIG_DEBUG_LOCK_ALLOC
2810static struct lock_class_key cifs_key[2];
2811static struct lock_class_key cifs_slock_key[2];
2812
2813static inline void
2814cifs_reclassify_socket4(struct socket *sock)
2815{
2816 struct sock *sk = sock->sk;
2817 BUG_ON(sock_owned_by_user(sk));
2818 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2819 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2820}
2821
2822static inline void
2823cifs_reclassify_socket6(struct socket *sock)
2824{
2825 struct sock *sk = sock->sk;
2826 BUG_ON(sock_owned_by_user(sk));
2827 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2828 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2829}
2830#else
2831static inline void
2832cifs_reclassify_socket4(struct socket *sock)
2833{
2834}
2835
2836static inline void
2837cifs_reclassify_socket6(struct socket *sock)
2838{
2839}
2840#endif
2841
1da177e4 2842/* See RFC1001 section 14 on representation of Netbios names */
50c2f753 2843static void rfc1002mangle(char *target, char *source, unsigned int length)
1da177e4 2844{
50c2f753 2845 unsigned int i, j;
1da177e4 2846
50c2f753 2847 for (i = 0, j = 0; i < (length); i++) {
1da177e4
LT		 2848 /* mask a nibble at a time and encode */
2849 target[j] = 'A' + (0x0F & (source[i] >> 4));
2850 target[j+1] = 'A' + (0x0F & source[i]);
50c2f753 2851 j += 2;
1da177e4
LT		 2852 }
2853
2854}
2855
3eb9a889
BG		 2856static int
2857bind_socket(struct TCP_Server_Info *server)
2858{
2859 int rc = 0;
2860 if (server->srcaddr.ss_family != AF_UNSPEC) {
2861 /* Bind to the specified local IP address */
2862 struct socket *socket = server->ssocket;
2863 rc = socket->ops->bind(socket,
2864 (struct sockaddr *) &server->srcaddr,
2865 sizeof(server->srcaddr));
2866 if (rc < 0) {
2867 struct sockaddr_in *saddr4;
2868 struct sockaddr_in6 *saddr6;
2869 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2870 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2871 if (saddr6->sin6_family == AF_INET6)
f96637be
JP		 2872 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2873 &saddr6->sin6_addr, rc);
3eb9a889 2874 else
f96637be
JP		 2875 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2876 &saddr4->sin_addr.s_addr, rc);
3eb9a889
BG		 2877 }
2878 }
2879 return rc;
2880}
1da177e4
LT		 2881
2882static int
a9f1b85e 2883ip_rfc1001_connect(struct TCP_Server_Info *server)
1da177e4
LT		 2884{
2885 int rc = 0;
a9f1b85e
PS		 2886 /*
2887 * some servers require RFC1001 sessinit before sending
2888 * negprot - BB check reconnection in case where second
2889 * sessinit is sent but no second negprot
2890 */
2891 struct rfc1002_session_packet *ses_init_buf;
2892 struct smb_hdr *smb_buf;
2893 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2894 GFP_KERNEL);
2895 if (ses_init_buf) {
2896 ses_init_buf->trailer.session_req.called_len = 32;
2897
2898 if (server->server_RFC1001_name &&
2899 server->server_RFC1001_name[0] != 0)
2900 rfc1002mangle(ses_init_buf->trailer.
2901 session_req.called_name,
2902 server->server_RFC1001_name,
2903 RFC1001_NAME_LEN_WITH_NULL);
2904 else
2905 rfc1002mangle(ses_init_buf->trailer.
2906 session_req.called_name,
2907 DEFAULT_CIFS_CALLED_NAME,
2908 RFC1001_NAME_LEN_WITH_NULL);
2909
2910 ses_init_buf->trailer.session_req.calling_len = 32;
2911
2912 /*
2913 * calling name ends in null (byte 16) from old smb
2914 * convention.
2915 */
2916 if (server->workstation_RFC1001_name &&
2917 server->workstation_RFC1001_name[0] != 0)
2918 rfc1002mangle(ses_init_buf->trailer.
2919 session_req.calling_name,
2920 server->workstation_RFC1001_name,
2921 RFC1001_NAME_LEN_WITH_NULL);
2922 else
2923 rfc1002mangle(ses_init_buf->trailer.
2924 session_req.calling_name,
2925 "LINUX_CIFS_CLNT",
2926 RFC1001_NAME_LEN_WITH_NULL);
2927
2928 ses_init_buf->trailer.session_req.scope1 = 0;
2929 ses_init_buf->trailer.session_req.scope2 = 0;
2930 smb_buf = (struct smb_hdr *)ses_init_buf;
2931
2932 /* sizeof RFC1002_SESSION_REQUEST with no scope */
be8e3b00 2933 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
a9f1b85e
PS		 2934 rc = smb_send(server, smb_buf, 0x44);
2935 kfree(ses_init_buf);
2936 /*
2937 * RFC1001 layer in at least one server
2938 * requires very short break before negprot
2939 * presumably because not expecting negprot
2940 * to follow so fast. This is a simple
2941 * solution that works without
2942 * complicating the code and causes no
2943 * significant slowing down on mount
2944 * for everyone else
2945 */
2946 usleep_range(1000, 2000);
2947 }
2948 /*
2949 * else the negprot may still work without this
2950 * even though malloc failed
2951 */
2952
2953 return rc;
2954}
2955
2956static int
2957generic_ip_connect(struct TCP_Server_Info *server)
2958{
2959 int rc = 0;
6da97910 2960 __be16 sport;
a9f1b85e 2961 int slen, sfamily;
bcf4b106 2962 struct socket *socket = server->ssocket;
a9f1b85e
PS		 2963 struct sockaddr *saddr;
2964
2965 saddr = (struct sockaddr *) &server->dstaddr;
2966
2967 if (server->dstaddr.ss_family == AF_INET6) {
2968 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2969 slen = sizeof(struct sockaddr_in6);
2970 sfamily = AF_INET6;
2971 } else {
2972 sport = ((struct sockaddr_in *) saddr)->sin_port;
2973 slen = sizeof(struct sockaddr_in);
2974 sfamily = AF_INET;
2975 }
1da177e4 2976
bcf4b106 2977 if (socket == NULL) {
f1d0c998
RL		 2978 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2979 IPPROTO_TCP, &socket, 1);
1da177e4 2980 if (rc < 0) {
f96637be 2981 cifs_dbg(VFS, "Error %d creating socket\n", rc);
a9f1b85e 2982 server->ssocket = NULL;
1da177e4 2983 return rc;
1da177e4 2984 }
bcf4b106
JL		 2985
2986 /* BB other socket options to set KEEPALIVE, NODELAY? */
f96637be 2987 cifs_dbg(FYI, "Socket created\n");
bcf4b106
JL		 2988 server->ssocket = socket;
2989 socket->sk->sk_allocation = GFP_NOFS;
a9f1b85e
PS		 2990 if (sfamily == AF_INET6)
2991 cifs_reclassify_socket6(socket);
2992 else
2993 cifs_reclassify_socket4(socket);
1da177e4
LT		 2994 }
2995
3eb9a889
BG		 2996 rc = bind_socket(server);
2997 if (rc < 0)
2998 return rc;
2999
bcf4b106
JL		 3000 /*
3001 * Eventually check for other socket options to change from
a9f1b85e
PS		 3002 * the default. sock_setsockopt not used because it expects
3003 * user space buffer
bcf4b106
JL		 3004 */
3005 socket->sk->sk_rcvtimeo = 7 * HZ;
da505c38 3006 socket->sk->sk_sndtimeo = 5 * HZ;
edf1ae40 3007
b387eaeb 3008 /* make the bufsizes depend on wsize/rsize and max requests */
bcf4b106
JL		 3009 if (server->noautotune) {
3010 if (socket->sk->sk_sndbuf < (200 * 1024))
3011 socket->sk->sk_sndbuf = 200 * 1024;
3012 if (socket->sk->sk_rcvbuf < (140 * 1024))
3013 socket->sk->sk_rcvbuf = 140 * 1024;
edf1ae40 3014 }
1da177e4 3015
6a5fa236 3016 if (server->tcp_nodelay) {
a9f1b85e 3017 int val = 1;
6a5fa236
SF		 3018 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3019 (char *)&val, sizeof(val));
3020 if (rc)
f96637be
JP		 3021 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3022 rc);
6a5fa236
SF		 3023 }
3024
f96637be 3025 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
bcf4b106 3026 socket->sk->sk_sndbuf,
b6b38f70 3027 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
bcf4b106 3028
ee1b3ea9
JL		 3029 rc = socket->ops->connect(socket, saddr, slen, 0);
3030 if (rc < 0) {
f96637be 3031 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
ee1b3ea9
JL		 3032 sock_release(socket);
3033 server->ssocket = NULL;
3034 return rc;
3035 }
3036
a9f1b85e
PS		 3037 if (sport == htons(RFC1001_PORT))
3038 rc = ip_rfc1001_connect(server);
50c2f753 3039
1da177e4
LT		 3040 return rc;
3041}
3042
3043static int
a9f1b85e 3044ip_connect(struct TCP_Server_Info *server)
1da177e4 3045{
6da97910 3046 __be16 *sport;
a9f1b85e
PS		 3047 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3048 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1da177e4 3049
a9f1b85e
PS		 3050 if (server->dstaddr.ss_family == AF_INET6)
3051 sport = &addr6->sin6_port;
3052 else
3053 sport = &addr->sin_port;
1da177e4 3054
a9f1b85e
PS		 3055 if (*sport == 0) {
3056 int rc;
1da177e4 3057
a9f1b85e
PS		 3058 /* try with 445 port at first */
3059 *sport = htons(CIFS_PORT);
3eb9a889 3060
a9f1b85e 3061 rc = generic_ip_connect(server);
1da177e4 3062 if (rc >= 0)
a9f1b85e 3063 return rc;
6a5fa236 3064
a9f1b85e
PS		 3065 /* if it failed, try with 139 port */
3066 *sport = htons(RFC1001_PORT);
6a5fa236
SF		 3067 }
3068
a9f1b85e 3069 return generic_ip_connect(server);
1da177e4
LT		 3070}
3071
6d5786a3 3072void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
2c6292ae 3073 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
8af18971
SF		 3074{
3075 /* if we are reconnecting then should we check to see if
3076 * any requested capabilities changed locally e.g. via
3077 * remount but we can not do much about it here
3078 * if they have (even if we could detect it by the following)
3079 * Perhaps we could add a backpointer to array of sb from tcon
3080 * or if we change to make all sb to same share the same
3081 * sb as NFS - then we only have one backpointer to sb.
3082 * What if we wanted to mount the server share twice once with
3083 * and once without posixacls or posix paths? */
3084 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
50c2f753 3085
c18c842b
SF		 3086 if (vol_info && vol_info->no_linux_ext) {
3087 tcon->fsUnixInfo.Capability = 0;
3088 tcon->unix_ext = 0; /* Unix Extensions disabled */
f96637be 3089 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
c18c842b
SF		 3090 return;
3091 } else if (vol_info)
3092 tcon->unix_ext = 1; /* Unix Extensions supported */
3093
3094 if (tcon->unix_ext == 0) {
f96637be 3095 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
c18c842b
SF		 3096 return;
3097 }
50c2f753 3098
fb8c4b14 3099 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
8af18971 3100 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
f96637be 3101 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
8af18971
SF		 3102 /* check for reconnect case in which we do not
3103 want to change the mount behavior if we can avoid it */
fb8c4b14 3104 if (vol_info == NULL) {
50c2f753 3105 /* turn off POSIX ACL and PATHNAMES if not set
8af18971
SF		 3106 originally at mount time */
3107 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3108 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
11b6d645
IM		 3109 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3110 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3111 cifs_dbg(VFS, "POSIXPATH support change\n");
8af18971 3112 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
11b6d645 3113 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
f96637be
JP		 3114 cifs_dbg(VFS, "possible reconnect error\n");
3115 cifs_dbg(VFS, "server disabled POSIX path support\n");
11b6d645 3116 }
8af18971 3117 }
50c2f753 3118
6848b733 3119 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3120 cifs_dbg(VFS, "per-share encryption not supported yet\n");
6848b733 3121
8af18971 3122 cap &= CIFS_UNIX_CAP_MASK;
75865f8c 3123 if (vol_info && vol_info->no_psx_acl)
8af18971 3124 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
75865f8c 3125 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
f96637be 3126 cifs_dbg(FYI, "negotiated posix acl support\n");
2c6292ae
AV		 3127 if (cifs_sb)
3128 cifs_sb->mnt_cifs_flags |=
3129 CIFS_MOUNT_POSIXACL;
8af18971
SF		 3130 }
3131
75865f8c 3132 if (vol_info && vol_info->posix_paths == 0)
8af18971 3133 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
75865f8c 3134 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
f96637be 3135 cifs_dbg(FYI, "negotiate posix pathnames\n");
2c6292ae
AV		 3136 if (cifs_sb)
3137 cifs_sb->mnt_cifs_flags |=
8af18971
SF		 3138 CIFS_MOUNT_POSIX_PATHS;
3139 }
50c2f753 3140
f96637be 3141 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
8af18971 3142#ifdef CONFIG_CIFS_DEBUG2
75865f8c 3143 if (cap & CIFS_UNIX_FCNTL_CAP)
f96637be 3144 cifs_dbg(FYI, "FCNTL cap\n");
75865f8c 3145 if (cap & CIFS_UNIX_EXTATTR_CAP)
f96637be 3146 cifs_dbg(FYI, "EXTATTR cap\n");
75865f8c 3147 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
f96637be 3148 cifs_dbg(FYI, "POSIX path cap\n");
75865f8c 3149 if (cap & CIFS_UNIX_XATTR_CAP)
f96637be 3150 cifs_dbg(FYI, "XATTR cap\n");
75865f8c 3151 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
f96637be 3152 cifs_dbg(FYI, "POSIX ACL cap\n");
75865f8c 3153 if (cap & CIFS_UNIX_LARGE_READ_CAP)
f96637be 3154 cifs_dbg(FYI, "very large read cap\n");
75865f8c 3155 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
f96637be 3156 cifs_dbg(FYI, "very large write cap\n");
6848b733 3157 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
f96637be 3158 cifs_dbg(FYI, "transport encryption cap\n");
6848b733 3159 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
f96637be 3160 cifs_dbg(FYI, "mandatory transport encryption cap\n");
8af18971
SF		 3161#endif /* CIFS_DEBUG2 */
3162 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
442aa310 3163 if (vol_info == NULL) {
f96637be 3164 cifs_dbg(FYI, "resetting capabilities failed\n");
442aa310 3165 } else
f96637be 3166 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 3167
8af18971
SF		 3168 }
3169 }
3170}
3171
724d9f1c
PS		 3172void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3173 struct cifs_sb_info *cifs_sb)
b1c8d2b4 3174{
2de970ff
JL		 3175 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3176
2ced6f69
AV		 3177 spin_lock_init(&cifs_sb->tlink_tree_lock);
3178 cifs_sb->tlink_tree = RB_ROOT;
3179
25c7f41e 3180 /*
5eba8ab3
JL		 3181 * Temporarily set r/wsize for matching superblock. If we end up using
3182 * new sb then client will later negotiate it downward if needed.
25c7f41e 3183 */
5eba8ab3 3184 cifs_sb->rsize = pvolume_info->rsize;
25c7f41e
PS		 3185 cifs_sb->wsize = pvolume_info->wsize;
3186
3b795210
SF		 3187 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3188 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3189 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3190 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
f96637be
JP		 3191 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3192 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3b795210 3193
6d20e840 3194 cifs_sb->actimeo = pvolume_info->actimeo;
724d9f1c 3195 cifs_sb->local_nls = pvolume_info->local_nls;
6d20e840 3196
3b795210
SF		 3197 if (pvolume_info->noperm)
3198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3199 if (pvolume_info->setuids)
3200 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3201 if (pvolume_info->server_ino)
3202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3203 if (pvolume_info->remap)
2baa2682
SF		 3204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3205 if (pvolume_info->sfu_remap)
3b795210
SF		 3206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3207 if (pvolume_info->no_xattr)
3208 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3209 if (pvolume_info->sfu_emul)
3210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3211 if (pvolume_info->nobrl)
3212 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
be652445 3213 if (pvolume_info->nostrictsync)
4717bed6 3214 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
13a6e42a
SF		 3215 if (pvolume_info->mand_lock)
3216 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
d4ffff1f
PS		 3217 if (pvolume_info->rwpidforward)
3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3b795210
SF		 3219 if (pvolume_info->cifs_acl)
3220 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3c7c87fd 3221 if (pvolume_info->backupuid_specified) {
3d3ea8e6 3222 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3c7c87fd
SP		 3223 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3224 }
3225 if (pvolume_info->backupgid_specified) {
3d3ea8e6 3226 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3c7c87fd
SP		 3227 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3228 }
3b795210
SF		 3229 if (pvolume_info->override_uid)
3230 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3231 if (pvolume_info->override_gid)
3232 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3233 if (pvolume_info->dynperm)
3234 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
fa1df75d
SJ		 3235 if (pvolume_info->fsc)
3236 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
0eb8a132
JL		 3237 if (pvolume_info->multiuser)
3238 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3239 CIFS_MOUNT_NO_PERM);
d39454ff
PS		 3240 if (pvolume_info->strict_io)
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3b795210 3242 if (pvolume_info->direct_io) {
f96637be 3243 cifs_dbg(FYI, "mounting share using direct i/o\n");
3b795210
SF		 3244 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3245 }
736a3320
SM		 3246 if (pvolume_info->mfsymlinks) {
3247 if (pvolume_info->sfu_emul) {
db8b631d
SF		 3248 /*
3249 * Our SFU ("Services for Unix" emulation does not allow
3250 * creating symlinks but does allow reading existing SFU
3251 * symlinks (it does allow both creating and reading SFU
3252 * style mknod and FIFOs though). When "mfsymlinks" and
3253 * "sfu" are both enabled at the same time, it allows
3254 * reading both types of symlinks, but will only create
3255 * them with mfsymlinks format. This allows better
3256 * Apple compatibility (probably better for Samba too)
3257 * while still recognizing old Windows style symlinks.
3258 */
3259 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
736a3320 3260 }
db8b631d 3261 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
736a3320 3262 }
3b795210
SF		 3263
3264 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
f96637be 3265 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
b1c8d2b4
JL		 3266}
3267
b9bce2e9
JL		 3268static void
3269cleanup_volume_info_contents(struct smb_vol *volume_info)
1bfe73c2 3270{
b946845a 3271 kfree(volume_info->username);
1bfe73c2 3272 kzfree(volume_info->password);
95c75454 3273 kfree(volume_info->UNC);
b946845a
SF		 3274 kfree(volume_info->domainname);
3275 kfree(volume_info->iocharset);
1bfe73c2 3276 kfree(volume_info->prepath);
b9bce2e9
JL		 3277}
3278
3279void
3280cifs_cleanup_volume_info(struct smb_vol *volume_info)
3281{
3282 if (!volume_info)
3283 return;
3284 cleanup_volume_info_contents(volume_info);
1bfe73c2 3285 kfree(volume_info);
1bfe73c2
IM		 3286}
3287
b9bce2e9 3288
2d6d589d 3289#ifdef CONFIG_CIFS_DFS_UPCALL
6d3ea7e4
SF		 3290/*
3291 * cifs_build_path_to_root returns full path to root when we do not have an
3292 * exiting connection (tcon)
3293 */
1bfe73c2 3294static char *
b2a0fa15 3295build_unc_path_to_root(const struct smb_vol *vol,
1bfe73c2
IM		 3296 const struct cifs_sb_info *cifs_sb)
3297{
b2a0fa15 3298 char *full_path, *pos;
839db3d1 3299 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
b2a0fa15 3300 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
1bfe73c2 3301
b2a0fa15 3302 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
1bfe73c2
IM		 3303 if (full_path == NULL)
3304 return ERR_PTR(-ENOMEM);
3305
b2a0fa15
JL		 3306 strncpy(full_path, vol->UNC, unc_len);
3307 pos = full_path + unc_len;
3308
3309 if (pplen) {
1fc29bac
JL		 3310 *pos = CIFS_DIR_SEP(cifs_sb);
3311 strncpy(pos + 1, vol->prepath, pplen);
b2a0fa15
JL		 3312 pos += pplen;
3313 }
3314
3315 *pos = '\0'; /* add trailing null */
f87d39d9 3316 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
f96637be 3317 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
1bfe73c2
IM		 3318 return full_path;
3319}
dd613945
SF		 3320
3321/*
3322 * Perform a dfs referral query for a share and (optionally) prefix
3323 *
046462ab
SF		 3324 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3325 * to a string containing updated options for the submount. Otherwise it
3326 * will be left untouched.
dd613945
SF		 3327 *
3328 * Returns the rc from get_dfs_path to the caller, which can be used to
3329 * determine whether there were referrals.
3330 */
3331static int
b669f33c 3332expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
dd613945 3333 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
046462ab 3334 int check_prefix)
dd613945
SF		 3335{
3336 int rc;
3337 unsigned int num_referrals = 0;
3338 struct dfs_info3_param *referrals = NULL;
3339 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3340
3341 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3342 if (IS_ERR(full_path))
3343 return PTR_ERR(full_path);
3344
3345 /* For DFS paths, skip the first '\' of the UNC */
3346 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3347
b669f33c 3348 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
2baa2682 3349 &num_referrals, &referrals, cifs_remap(cifs_sb));
dd613945
SF		 3350
3351 if (!rc && num_referrals > 0) {
3352 char *fake_devname = NULL;
3353
3354 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3355 full_path + 1, referrals,
3356 &fake_devname);
3357
3358 free_dfs_info_array(referrals, num_referrals);
046462ab 3359
dd613945
SF		 3360 if (IS_ERR(mdata)) {
3361 rc = PTR_ERR(mdata);
3362 mdata = NULL;
b9bce2e9
JL		 3363 } else {
3364 cleanup_volume_info_contents(volume_info);
b9bce2e9
JL		 3365 rc = cifs_setup_volume_info(volume_info, mdata,
3366 fake_devname);
dd613945 3367 }
b9bce2e9
JL		 3368 kfree(fake_devname);
3369 kfree(cifs_sb->mountdata);
046462ab 3370 cifs_sb->mountdata = mdata;
dd613945
SF		 3371 }
3372 kfree(full_path);
3373 return rc;
3374}
2d6d589d 3375#endif
1bfe73c2 3376
04db79b0
JL		 3377static int
3378cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3379 const char *devname)
1da177e4 3380{
724d9f1c 3381 int rc = 0;
1da177e4 3382
04db79b0
JL		 3383 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3384 return -EINVAL;
1da177e4 3385
7586b765 3386 if (volume_info->nullauth) {
f96637be 3387 cifs_dbg(FYI, "Anonymous login\n");
04febabc
JL		 3388 kfree(volume_info->username);
3389 volume_info->username = NULL;
7586b765 3390 } else if (volume_info->username) {
1da177e4 3391 /* BB fixme parse for domain name here */
f96637be 3392 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
1da177e4 3393 } else {
f96637be 3394 cifs_dbg(VFS, "No username specified\n");
50c2f753
SF		 3395 /* In userspace mount helper we can get user name from alternate
3396 locations such as env variables and files on disk */
04db79b0 3397 return -EINVAL;
1da177e4
LT		 3398 }
3399
1da177e4 3400 /* this is needed for ASCII cp to Unicode converts */
7586b765 3401 if (volume_info->iocharset == NULL) {
a5fc4ce0
JL		 3402 /* load_nls_default cannot return null */
3403 volume_info->local_nls = load_nls_default();
1da177e4 3404 } else {
a5fc4ce0
JL		 3405 volume_info->local_nls = load_nls(volume_info->iocharset);
3406 if (volume_info->local_nls == NULL) {
f96637be 3407 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
b6b38f70 3408 volume_info->iocharset);
04db79b0 3409 return -ELIBACC;
1da177e4
LT		 3410 }
3411 }
724d9f1c 3412
724d9f1c
PS		 3413 return rc;
3414}
3415
04db79b0
JL		 3416struct smb_vol *
3417cifs_get_volume_info(char *mount_data, const char *devname)
3418{
3419 int rc;
3420 struct smb_vol *volume_info;
3421
6ee9542a 3422 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
04db79b0
JL		 3423 if (!volume_info)
3424 return ERR_PTR(-ENOMEM);
3425
3426 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3427 if (rc) {
3428 cifs_cleanup_volume_info(volume_info);
3429 volume_info = ERR_PTR(rc);
3430 }
3431
3432 return volume_info;
3433}
3434
724d9f1c 3435int
2c6292ae 3436cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
724d9f1c 3437{
1daaae8f 3438 int rc;
6d5786a3 3439 unsigned int xid;
af4281dc 3440 struct cifs_ses *ses;
96daf2b0 3441 struct cifs_tcon *tcon;
af4281dc 3442 struct TCP_Server_Info *server;
724d9f1c
PS		 3443 char *full_path;
3444 struct tcon_link *tlink;
3445#ifdef CONFIG_CIFS_DFS_UPCALL
3446 int referral_walks_count = 0;
20547490 3447#endif
dd854466 3448
b4caecd4 3449 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
dd854466
AV		 3450 if (rc)
3451 return rc;
3452
20547490 3453#ifdef CONFIG_CIFS_DFS_UPCALL
724d9f1c
PS		 3454try_mount_again:
3455 /* cleanup activities if we're chasing a referral */
3456 if (referral_walks_count) {
3457 if (tcon)
3458 cifs_put_tcon(tcon);
af4281dc
PS		 3459 else if (ses)
3460 cifs_put_smb_ses(ses);
724d9f1c 3461
6d5786a3 3462 free_xid(xid);
724d9f1c
PS		 3463 }
3464#endif
1daaae8f 3465 rc = 0;
724d9f1c 3466 tcon = NULL;
af4281dc
PS		 3467 ses = NULL;
3468 server = NULL;
724d9f1c
PS		 3469 full_path = NULL;
3470 tlink = NULL;
3471
6d5786a3 3472 xid = get_xid();
1da177e4 3473
63c038c2 3474 /* get a reference to a tcp session */
af4281dc
PS		 3475 server = cifs_get_tcp_session(volume_info);
3476 if (IS_ERR(server)) {
3477 rc = PTR_ERR(server);
dd854466 3478 bdi_destroy(&cifs_sb->bdi);
63c038c2 3479 goto out;
1da177e4
LT		 3480 }
3481
36988c76 3482 /* get a reference to a SMB session */
af4281dc
PS		 3483 ses = cifs_get_smb_ses(server, volume_info);
3484 if (IS_ERR(ses)) {
3485 rc = PTR_ERR(ses);
3486 ses = NULL;
36988c76 3487 goto mount_fail_check;
1da177e4 3488 }
50c2f753 3489
d00c28de 3490 /* search for existing tcon to this server share */
af4281dc 3491 tcon = cifs_get_tcon(ses, volume_info);
d00c28de
JL		 3492 if (IS_ERR(tcon)) {
3493 rc = PTR_ERR(tcon);
3494 tcon = NULL;
1bfe73c2 3495 goto remote_path_check;
d00c28de 3496 }
1bfe73c2 3497
d82c2df5 3498 /* tell server which Unix caps we support */
29e20f9c 3499 if (cap_unix(tcon->ses)) {
d82c2df5
SF		 3500 /* reset of caps checks mount to see if unix extensions
3501 disabled for just this mount */
2c6292ae 3502 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
6848b733
SF		 3503 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3504 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3505 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3506 rc = -EACCES;
3507 goto mount_fail_check;
3508 }
3509 } else
d82c2df5 3510 tcon->unix_ext = 0; /* server does not support them */
c18c842b 3511
af4281dc
PS		 3512 /* do not care if a following call succeed - informational */
3513 if (!tcon->ipc && server->ops->qfs_tcon)
3514 server->ops->qfs_tcon(xid, tcon);
6848b733 3515
24985c53
PS		 3516 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3517 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
f7910cbd 3518
66bfaadc 3519 /* tune readahead according to rsize */
8f71465c 3520 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
f7910cbd 3521
1bfe73c2 3522remote_path_check:
c1508ca2
SF		 3523#ifdef CONFIG_CIFS_DFS_UPCALL
3524 /*
3525 * Perform an unconditional check for whether there are DFS
3526 * referrals for this path without prefix, to provide support
3527 * for DFS referrals from w2k8 servers which don't seem to respond
3528 * with PATH_NOT_COVERED to requests that include the prefix.
3529 * Chase the referral if found, otherwise continue normally.
3530 */
3531 if (referral_walks_count == 0) {
af4281dc
PS		 3532 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3533 false);
c1508ca2
SF		 3534 if (!refrc) {
3535 referral_walks_count++;
3536 goto try_mount_again;
3537 }
3538 }
3539#endif
3540
f87d39d9 3541 /* check if a whole path is not remote */
70945643 3542 if (!rc && tcon) {
68889f26
PS		 3543 if (!server->ops->is_path_accessible) {
3544 rc = -ENOSYS;
3545 goto mount_fail_check;
3546 }
6d3ea7e4
SF		 3547 /*
3548 * cifs_build_path_to_root works only when we have a valid tcon
3549 */
3550 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
e4cce94c
IM		 3551 if (full_path == NULL) {
3552 rc = -ENOMEM;
3553 goto mount_fail_check;
3554 }
68889f26
PS		 3555 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3556 full_path);
03ceace5 3557 if (rc != 0 && rc != -EREMOTE) {
e4cce94c
IM		 3558 kfree(full_path);
3559 goto mount_fail_check;
3560 }
3561 kfree(full_path);
3562 }
3563
1bfe73c2
IM		 3564 /* get referral if needed */
3565 if (rc == -EREMOTE) {
d036f50f 3566#ifdef CONFIG_CIFS_DFS_UPCALL
5c2503a8
IM		 3567 if (referral_walks_count > MAX_NESTED_LINKS) {
3568 /*
3569 * BB: when we implement proper loop detection,
3570 * we will remove this check. But now we need it
3571 * to prevent an indefinite loop if 'DFS tree' is
3572 * misconfigured (i.e. has loops).
3573 */
3574 rc = -ELOOP;
3575 goto mount_fail_check;
3576 }
1bfe73c2 3577
af4281dc 3578 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
7b91e266 3579
dd613945 3580 if (!rc) {
5c2503a8 3581 referral_walks_count++;
1bfe73c2
IM		 3582 goto try_mount_again;
3583 }
dd613945 3584 goto mount_fail_check;
d036f50f
SF		 3585#else /* No DFS support, return error on mount */
3586 rc = -EOPNOTSUPP;
3587#endif
1bfe73c2
IM		 3588 }
3589
9d002df4
JL		 3590 if (rc)
3591 goto mount_fail_check;
3592
3593 /* now, hang the tcon off of the superblock */
3594 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3595 if (tlink == NULL) {
3596 rc = -ENOMEM;
3597 goto mount_fail_check;
3598 }
3599
af4281dc 3600 tlink->tl_uid = ses->linux_uid;
9d002df4
JL		 3601 tlink->tl_tcon = tcon;
3602 tlink->tl_time = jiffies;
3603 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3604 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3605
b647c35f 3606 cifs_sb->master_tlink = tlink;
9d002df4 3607 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 3608 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
9d002df4 3609 spin_unlock(&cifs_sb->tlink_tree_lock);
413e661c 3610
da472fc8 3611 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 3612 TLINK_IDLE_EXPIRE);
3613
1bfe73c2
IM		 3614mount_fail_check:
3615 /* on error free sesinfo and tcon struct if needed */
3616 if (rc) {
1bfe73c2 3617 /* If find_unc succeeded then rc == 0 so we can not end */
25985edc 3618 /* up accidentally freeing someone elses tcon struct */
1bfe73c2
IM		 3619 if (tcon)
3620 cifs_put_tcon(tcon);
af4281dc
PS		 3621 else if (ses)
3622 cifs_put_smb_ses(ses);
1bfe73c2 3623 else
af4281dc 3624 cifs_put_tcp_session(server);
dd854466 3625 bdi_destroy(&cifs_sb->bdi);
1bfe73c2
IM		 3626 }
3627
70fe7dc0 3628out:
6d5786a3 3629 free_xid(xid);
1da177e4
LT		 3630 return rc;
3631}
3632
8d1bca32
JL		 3633/*
3634 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3635 * pointer may be NULL.
3636 */
1da177e4 3637int
2e6e02ab 3638CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
96daf2b0 3639 const char *tree, struct cifs_tcon *tcon,
1da177e4
LT		 3640 const struct nls_table *nls_codepage)
3641{
3642 struct smb_hdr *smb_buffer;
3643 struct smb_hdr *smb_buffer_response;
3644 TCONX_REQ *pSMB;
3645 TCONX_RSP *pSMBr;
3646 unsigned char *bcc_ptr;
3647 int rc = 0;
690c522f
JL		 3648 int length;
3649 __u16 bytes_left, count;
1da177e4
LT		 3650
3651 if (ses == NULL)
3652 return -EIO;
3653
3654 smb_buffer = cifs_buf_get();
ca43e3be 3655 if (smb_buffer == NULL)
1da177e4 3656 return -ENOMEM;
ca43e3be 3657
1da177e4
LT		 3658 smb_buffer_response = smb_buffer;
3659
3660 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3661 NULL /*no tid */ , 4 /*wct */ );
1982c344 3662
88257360 3663 smb_buffer->Mid = get_next_mid(ses->server);
1da177e4
LT		 3664 smb_buffer->Uid = ses->Suid;
3665 pSMB = (TCONX_REQ *) smb_buffer;
3666 pSMBr = (TCONX_RSP *) smb_buffer_response;
3667
3668 pSMB->AndXCommand = 0xFF;
3669 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
1da177e4 3670 bcc_ptr = &pSMB->Password[0];
8d1bca32 3671 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
eeac8047 3672 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
7c7b25bc 3673 *bcc_ptr = 0; /* password is null byte */
eeac8047 3674 bcc_ptr++; /* skip password */
7c7b25bc 3675 /* already aligned so no need to do it below */
eeac8047 3676 } else {
540b2e37 3677 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
eeac8047
SF		 3678 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3679 specified as required (when that support is added to
3680 the vfs in the future) as only NTLM or the much
7c7b25bc 3681 weaker LANMAN (which we do not send by default) is accepted
eeac8047
SF		 3682 by Samba (not sure whether other servers allow
3683 NTLMv2 password here) */
7c7b25bc 3684#ifdef CONFIG_CIFS_WEAK_PW_HASH
04912d6a 3685 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3f618223 3686 (ses->sectype == LANMAN))
d3ba50b1 3687 calc_lanman_hash(tcon->password, ses->server->cryptkey,
96daf2b0 3688 ses->server->sec_mode &
4e53a3fb
JL		 3689 SECMODE_PW_ENCRYPT ? true : false,
3690 bcc_ptr);
7c7b25bc
SF		 3691 else
3692#endif /* CIFS_WEAK_PW_HASH */
ee2c9258 3693 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
9ef5992e 3694 bcc_ptr, nls_codepage);
eeac8047 3695
540b2e37 3696 bcc_ptr += CIFS_AUTH_RESP_SIZE;
fb8c4b14 3697 if (ses->capabilities & CAP_UNICODE) {
7c7b25bc
SF		 3698 /* must align unicode strings */
3699 *bcc_ptr = 0; /* null byte password */
3700 bcc_ptr++;
3701 }
eeac8047 3702 }
1da177e4 3703
38d77c50 3704 if (ses->server->sign)
1da177e4
LT		 3705 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3706
3707 if (ses->capabilities & CAP_STATUS32) {
3708 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3709 }
3710 if (ses->capabilities & CAP_DFS) {
3711 smb_buffer->Flags2 |= SMBFLG2_DFS;
3712 }
3713 if (ses->capabilities & CAP_UNICODE) {
3714 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3715 length =
acbbb76a 3716 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
50c2f753 3717 6 /* max utf8 char length in bytes */ *
a878fb22
SF		 3718 (/* server len*/ + 256 /* share len */), nls_codepage);
3719 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
1da177e4
LT		 3720 bcc_ptr += 2; /* skip trailing null */
3721 } else { /* ASCII */
1da177e4
LT		 3722 strcpy(bcc_ptr, tree);
3723 bcc_ptr += strlen(tree) + 1;
3724 }
3725 strcpy(bcc_ptr, "?????");
3726 bcc_ptr += strlen("?????");
3727 bcc_ptr += 1;
3728 count = bcc_ptr - &pSMB->Password[0];
be8e3b00
SF		 3729 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3730 pSMB->hdr.smb_buf_length) + count);
1da177e4
LT		 3731 pSMB->ByteCount = cpu_to_le16(count);
3732
133672ef 3733 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
7749981e 3734 0);
1da177e4 3735
1da177e4
LT		 3736 /* above now done in SendReceive */
3737 if ((rc == 0) && (tcon != NULL)) {
0e0d2cf3
SF		 3738 bool is_unicode;
3739
1da177e4 3740 tcon->tidStatus = CifsGood;
3b795210 3741 tcon->need_reconnect = false;
1da177e4
LT		 3742 tcon->tid = smb_buffer_response->Tid;
3743 bcc_ptr = pByteArea(smb_buffer_response);
690c522f 3744 bytes_left = get_bcc(smb_buffer_response);
cc20c031 3745 length = strnlen(bcc_ptr, bytes_left - 2);
0e0d2cf3
SF		 3746 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3747 is_unicode = true;
3748 else
3749 is_unicode = false;
3750
cc20c031 3751
50c2f753 3752 /* skip service field (NB: this field is always ASCII) */
7f8ed420
SF		 3753 if (length == 3) {
3754 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3755 (bcc_ptr[2] == 'C')) {
f96637be 3756 cifs_dbg(FYI, "IPC connection\n");
7f8ed420
SF		 3757 tcon->ipc = 1;
3758 }
3759 } else if (length == 2) {
3760 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3761 /* the most common case */
f96637be 3762 cifs_dbg(FYI, "disk share connection\n");
7f8ed420
SF		 3763 }
3764 }
50c2f753 3765 bcc_ptr += length + 1;
cc20c031 3766 bytes_left -= (length + 1);
46b51d08 3767 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
cc20c031
JL		 3768
3769 /* mostly informational -- no need to fail on error here */
90a98b2f 3770 kfree(tcon->nativeFileSystem);
acbbb76a 3771 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
0e0d2cf3 3772 bytes_left, is_unicode,
cc20c031
JL		 3773 nls_codepage);
3774
f96637be 3775 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
cc20c031 3776
fb8c4b14 3777 if ((smb_buffer_response->WordCount == 3) ||
1a4e15a0
SF		 3778 (smb_buffer_response->WordCount == 7))
3779 /* field is in same location */
3979877e
SF		 3780 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3781 else
3782 tcon->Flags = 0;
f96637be 3783 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
1da177e4 3784 } else if ((rc == 0) && tcon == NULL) {
50c2f753 3785 /* all we need to save for IPC$ connection */
1da177e4
LT		 3786 ses->ipc_tid = smb_buffer_response->Tid;
3787 }
3788
a8a11d39 3789 cifs_buf_release(smb_buffer);
1da177e4
LT		 3790 return rc;
3791}
3792
2e32cf5e
AV		 3793static void delayed_free(struct rcu_head *p)
3794{
3795 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3796 unload_nls(sbi->local_nls);
3797 kfree(sbi);
3798}
3799
2a9b9951
AV		 3800void
3801cifs_umount(struct cifs_sb_info *cifs_sb)
1da177e4 3802{
b647c35f
JL		 3803 struct rb_root *root = &cifs_sb->tlink_tree;
3804 struct rb_node *node;
3805 struct tcon_link *tlink;
9d002df4 3806
2de970ff
JL		 3807 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3808
b647c35f
JL		 3809 spin_lock(&cifs_sb->tlink_tree_lock);
3810 while ((node = rb_first(root))) {
3811 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3812 cifs_get_tlink(tlink);
3813 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3814 rb_erase(node, root);
1da177e4 3815
b647c35f
JL		 3816 spin_unlock(&cifs_sb->tlink_tree_lock);
3817 cifs_put_tlink(tlink);
3818 spin_lock(&cifs_sb->tlink_tree_lock);
3819 }
3820 spin_unlock(&cifs_sb->tlink_tree_lock);
50c2f753 3821
dd854466 3822 bdi_destroy(&cifs_sb->bdi);
d757d71b 3823 kfree(cifs_sb->mountdata);
2e32cf5e 3824 call_rcu(&cifs_sb->rcu, delayed_free);
50c2f753 3825}
1da177e4 3826
286170aa
PS		 3827int
3828cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
1da177e4
LT		 3829{
3830 int rc = 0;
198b5682 3831 struct TCP_Server_Info *server = ses->server;
1da177e4 3832
286170aa
PS		 3833 if (!server->ops->need_neg || !server->ops->negotiate)
3834 return -ENOSYS;
3835
198b5682 3836 /* only send once per connect */
286170aa 3837 if (!server->ops->need_neg(server))
198b5682
JL		 3838 return 0;
3839
45275789 3840 set_credits(server, 1);
286170aa
PS		 3841
3842 rc = server->ops->negotiate(xid, ses);
198b5682
JL		 3843 if (rc == 0) {
3844 spin_lock(&GlobalMid_Lock);
7fdbaa1b 3845 if (server->tcpStatus == CifsNeedNegotiate)
198b5682
JL		 3846 server->tcpStatus = CifsGood;
3847 else
3848 rc = -EHOSTDOWN;
3849 spin_unlock(&GlobalMid_Lock);
198b5682
JL		 3850 }
3851
3852 return rc;
3853}
3854
58c45c58
PS		 3855int
3856cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3857 struct nls_table *nls_info)
198b5682 3858{
58c45c58 3859 int rc = -ENOSYS;
198b5682 3860 struct TCP_Server_Info *server = ses->server;
26b994fa 3861
198b5682 3862 ses->capabilities = server->capabilities;
26b994fa 3863 if (linuxExtEnabled == 0)
29e20f9c 3864 ses->capabilities &= (~server->vals->cap_unix);
20418acd 3865
f96637be 3866 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
96daf2b0 3867 server->sec_mode, server->capabilities, server->timeAdj);
cb7691b6 3868
58c45c58
PS		 3869 if (server->ops->sess_setup)
3870 rc = server->ops->sess_setup(xid, ses, nls_info);
3871
d4e63bd6 3872 if (rc)
f96637be 3873 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
21e73393 3874
1da177e4
LT		 3875 return rc;
3876}
3877
8a8798a5
JL		 3878static int
3879cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3880{
3f618223
JL		 3881 vol->sectype = ses->sectype;
3882
3883 /* krb5 is special, since we don't need username or pw */
3884 if (vol->sectype == Kerberos)
8a8798a5 3885 return 0;
8a8798a5
JL		 3886
3887 return cifs_set_cifscreds(vol, ses);
3888}
3889
96daf2b0 3890static struct cifs_tcon *
6d4a0832 3891cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
9d002df4 3892{
8a8798a5 3893 int rc;
96daf2b0
SF		 3894 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3895 struct cifs_ses *ses;
3896 struct cifs_tcon *tcon = NULL;
9d002df4 3897 struct smb_vol *vol_info;
9d002df4
JL		 3898
3899 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
803ab977
DC		 3900 if (vol_info == NULL)
3901 return ERR_PTR(-ENOMEM);
9d002df4 3902
9d002df4
JL		 3903 vol_info->local_nls = cifs_sb->local_nls;
3904 vol_info->linux_uid = fsuid;
3905 vol_info->cred_uid = fsuid;
3906 vol_info->UNC = master_tcon->treeName;
3907 vol_info->retry = master_tcon->retry;
3908 vol_info->nocase = master_tcon->nocase;
3909 vol_info->local_lease = master_tcon->local_lease;
3910 vol_info->no_linux_ext = !master_tcon->unix_ext;
28e11bd8
JL		 3911 vol_info->sectype = master_tcon->ses->sectype;
3912 vol_info->sign = master_tcon->ses->sign;
9d002df4 3913
8a8798a5
JL		 3914 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3915 if (rc) {
3916 tcon = ERR_PTR(rc);
3917 goto out;
3918 }
9d002df4
JL		 3919
3920 /* get a reference for the same TCP session */
3f9bcca7 3921 spin_lock(&cifs_tcp_ses_lock);
9d002df4 3922 ++master_tcon->ses->server->srv_count;
3f9bcca7 3923 spin_unlock(&cifs_tcp_ses_lock);
9d002df4
JL		 3924
3925 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3926 if (IS_ERR(ses)) {
96daf2b0 3927 tcon = (struct cifs_tcon *)ses;
9d002df4
JL		 3928 cifs_put_tcp_session(master_tcon->ses->server);
3929 goto out;
3930 }
3931
3932 tcon = cifs_get_tcon(ses, vol_info);
3933 if (IS_ERR(tcon)) {
3934 cifs_put_smb_ses(ses);
3935 goto out;
3936 }
3937
29e20f9c 3938 if (cap_unix(ses))
9d002df4
JL		 3939 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3940out:
8a8798a5
JL		 3941 kfree(vol_info->username);
3942 kfree(vol_info->password);
9d002df4
JL		 3943 kfree(vol_info);
3944
3945 return tcon;
3946}
3947
96daf2b0 3948struct cifs_tcon *
9d002df4
JL		 3949cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3950{
3951 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3952}
3953
b647c35f
JL		 3954/* find and return a tlink with given uid */
3955static struct tcon_link *
6d4a0832 3956tlink_rb_search(struct rb_root *root, kuid_t uid)
b647c35f
JL		 3957{
3958 struct rb_node *node = root->rb_node;
3959 struct tcon_link *tlink;
3960
3961 while (node) {
3962 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3963
6d4a0832 3964 if (uid_gt(tlink->tl_uid, uid))
b647c35f 3965 node = node->rb_left;
6d4a0832 3966 else if (uid_lt(tlink->tl_uid, uid))
b647c35f
JL		 3967 node = node->rb_right;
3968 else
3969 return tlink;
3970 }
3971 return NULL;
3972}
3973
3974/* insert a tcon_link into the tree */
3975static void
3976tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3977{
3978 struct rb_node **new = &(root->rb_node), *parent = NULL;
3979 struct tcon_link *tlink;
3980
3981 while (*new) {
3982 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3983 parent = *new;
3984
6d4a0832 3985 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
b647c35f
JL		 3986 new = &((*new)->rb_left);
3987 else
3988 new = &((*new)->rb_right);
3989 }
3990
3991 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3992 rb_insert_color(&new_tlink->tl_rbnode, root);
3993}
3994
9d002df4
JL		 3995/*
3996 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3997 * current task.
3998 *
3999 * If the superblock doesn't refer to a multiuser mount, then just return
4000 * the master tcon for the mount.
4001 *
6ef933a3 4002 * First, search the rbtree for an existing tcon for this fsuid. If one
9d002df4
JL		 4003 * exists, then check to see if it's pending construction. If it is then wait
4004 * for construction to complete. Once it's no longer pending, check to see if
4005 * it failed and either return an error or retry construction, depending on
4006 * the timeout.
4007 *
4008 * If one doesn't exist then insert a new tcon_link struct into the tree and
4009 * try to construct a new one.
4010 */
4011struct tcon_link *
4012cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4013{
4014 int ret;
6d4a0832 4015 kuid_t fsuid = current_fsuid();
9d002df4
JL		 4016 struct tcon_link *tlink, *newtlink;
4017
4018 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4019 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4020
4021 spin_lock(&cifs_sb->tlink_tree_lock);
b647c35f 4022 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4023 if (tlink)
4024 cifs_get_tlink(tlink);
4025 spin_unlock(&cifs_sb->tlink_tree_lock);
4026
4027 if (tlink == NULL) {
4028 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4029 if (newtlink == NULL)
4030 return ERR_PTR(-ENOMEM);
b647c35f 4031 newtlink->tl_uid = fsuid;
9d002df4
JL		 4032 newtlink->tl_tcon = ERR_PTR(-EACCES);
4033 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4034 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4035 cifs_get_tlink(newtlink);
4036
9d002df4
JL		 4037 spin_lock(&cifs_sb->tlink_tree_lock);
4038 /* was one inserted after previous search? */
b647c35f 4039 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
9d002df4
JL		 4040 if (tlink) {
4041 cifs_get_tlink(tlink);
4042 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4043 kfree(newtlink);
4044 goto wait_for_construction;
4045 }
9d002df4 4046 tlink = newtlink;
b647c35f
JL		 4047 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4048 spin_unlock(&cifs_sb->tlink_tree_lock);
9d002df4
JL		 4049 } else {
4050wait_for_construction:
4051 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
9d002df4
JL		 4052 TASK_INTERRUPTIBLE);
4053 if (ret) {
4054 cifs_put_tlink(tlink);
74316201 4055 return ERR_PTR(-ERESTARTSYS);
9d002df4
JL		 4056 }
4057
4058 /* if it's good, return it */
4059 if (!IS_ERR(tlink->tl_tcon))
4060 return tlink;
4061
4062 /* return error if we tried this already recently */
4063 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4064 cifs_put_tlink(tlink);
4065 return ERR_PTR(-EACCES);
4066 }
4067
4068 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4069 goto wait_for_construction;
4070 }
4071
4072 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4073 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4074 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4075
4076 if (IS_ERR(tlink->tl_tcon)) {
4077 cifs_put_tlink(tlink);
4078 return ERR_PTR(-EACCES);
4079 }
4080
4081 return tlink;
4082}
2de970ff
JL		 4083
4084/*
4085 * periodic workqueue job that scans tcon_tree for a superblock and closes
4086 * out tcons.
4087 */
4088static void
4089cifs_prune_tlinks(struct work_struct *work)
4090{
4091 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4092 prune_tlinks.work);
b647c35f
JL		 4093 struct rb_root *root = &cifs_sb->tlink_tree;
4094 struct rb_node *node = rb_first(root);
4095 struct rb_node *tmp;
4096 struct tcon_link *tlink;
2de970ff 4097
b647c35f
JL		 4098 /*
4099 * Because we drop the spinlock in the loop in order to put the tlink
4100 * it's not guarded against removal of links from the tree. The only
4101 * places that remove entries from the tree are this function and
4102 * umounts. Because this function is non-reentrant and is canceled
4103 * before umount can proceed, this is safe.
4104 */
4105 spin_lock(&cifs_sb->tlink_tree_lock);
4106 node = rb_first(root);
4107 while (node != NULL) {
4108 tmp = node;
4109 node = rb_next(tmp);
4110 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4111
4112 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4113 atomic_read(&tlink->tl_count) != 0 ||
4114 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4115 continue;
2de970ff 4116
b647c35f
JL		 4117 cifs_get_tlink(tlink);
4118 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4119 rb_erase(tmp, root);
4120
4121 spin_unlock(&cifs_sb->tlink_tree_lock);
4122 cifs_put_tlink(tlink);
4123 spin_lock(&cifs_sb->tlink_tree_lock);
4124 }
4125 spin_unlock(&cifs_sb->tlink_tree_lock);
2de970ff 4126
da472fc8 4127 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2de970ff
JL		 4128 TLINK_IDLE_EXPIRE);
4129}
Linux kernel - Deliverables
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