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1/*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/net.h>
23#include <linux/string.h>
24#include <linux/list.h>
25#include <linux/wait.h>
26#include <linux/slab.h>
27#include <linux/pagemap.h>
28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/mempool.h>
31#include <linux/delay.h>
32#include <linux/completion.h>
33#include <linux/kthread.h>
34#include <linux/pagevec.h>
35#include <linux/freezer.h>
36#include <linux/namei.h>
37#include <asm/uaccess.h>
38#include <asm/processor.h>
39#include <linux/inet.h>
40#include <linux/module.h>
41#include <keys/user-type.h>
42#include <net/ipv6.h>
43#include <linux/parser.h>
44
45#include "cifspdu.h"
46#include "cifsglob.h"
47#include "cifsproto.h"
48#include "cifs_unicode.h"
49#include "cifs_debug.h"
50#include "cifs_fs_sb.h"
51#include "ntlmssp.h"
52#include "nterr.h"
53#include "rfc1002pdu.h"
54#include "fscache.h"
55
56#define CIFS_PORT 445
57#define RFC1001_PORT 139
58
59extern mempool_t *cifs_req_poolp;
60
61/* FIXME: should these be tunable? */
62#define TLINK_ERROR_EXPIRE (1 * HZ)
63#define TLINK_IDLE_EXPIRE (600 * HZ)
64
65enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapchars, Opt_nomapchars, Opt_sfu,
74 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
75 Opt_noposixpaths, Opt_nounix,
76 Opt_nocase,
77 Opt_brl, Opt_nobrl,
78 Opt_forcemandatorylock, Opt_setuids,
79 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
80 Opt_nohard, Opt_nosoft,
81 Opt_nointr, Opt_intr,
82 Opt_nostrictsync, Opt_strictsync,
83 Opt_serverino, Opt_noserverino,
84 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
85 Opt_acl, Opt_noacl, Opt_locallease,
86 Opt_sign, Opt_seal, Opt_noac,
87 Opt_fsc, Opt_mfsymlinks,
88 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
89
90 /* Mount options which take numeric value */
91 Opt_backupuid, Opt_backupgid, Opt_uid,
92 Opt_cruid, Opt_gid, Opt_file_mode,
93 Opt_dirmode, Opt_port,
94 Opt_rsize, Opt_wsize, Opt_actimeo,
95
96 /* Mount options which take string value */
97 Opt_user, Opt_pass, Opt_ip,
98 Opt_domain, Opt_srcaddr, Opt_iocharset,
99 Opt_netbiosname, Opt_servern,
100 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
101
102 /* Mount options to be ignored */
103 Opt_ignore,
104
105 /* Options which could be blank */
106 Opt_blank_pass,
107 Opt_blank_user,
108 Opt_blank_ip,
109
110 Opt_err
111};
112
113static const match_table_t cifs_mount_option_tokens = {
114
115 { Opt_user_xattr, "user_xattr" },
116 { Opt_nouser_xattr, "nouser_xattr" },
117 { Opt_forceuid, "forceuid" },
118 { Opt_noforceuid, "noforceuid" },
119 { Opt_forcegid, "forcegid" },
120 { Opt_noforcegid, "noforcegid" },
121 { Opt_noblocksend, "noblocksend" },
122 { Opt_noautotune, "noautotune" },
123 { Opt_hard, "hard" },
124 { Opt_soft, "soft" },
125 { Opt_perm, "perm" },
126 { Opt_noperm, "noperm" },
127 { Opt_mapchars, "mapchars" },
128 { Opt_nomapchars, "nomapchars" },
129 { Opt_sfu, "sfu" },
130 { Opt_nosfu, "nosfu" },
131 { Opt_nodfs, "nodfs" },
132 { Opt_posixpaths, "posixpaths" },
133 { Opt_noposixpaths, "noposixpaths" },
134 { Opt_nounix, "nounix" },
135 { Opt_nounix, "nolinux" },
136 { Opt_nocase, "nocase" },
137 { Opt_nocase, "ignorecase" },
138 { Opt_brl, "brl" },
139 { Opt_nobrl, "nobrl" },
140 { Opt_nobrl, "nolock" },
141 { Opt_forcemandatorylock, "forcemandatorylock" },
142 { Opt_forcemandatorylock, "forcemand" },
143 { Opt_setuids, "setuids" },
144 { Opt_nosetuids, "nosetuids" },
145 { Opt_dynperm, "dynperm" },
146 { Opt_nodynperm, "nodynperm" },
147 { Opt_nohard, "nohard" },
148 { Opt_nosoft, "nosoft" },
149 { Opt_nointr, "nointr" },
150 { Opt_intr, "intr" },
151 { Opt_nostrictsync, "nostrictsync" },
152 { Opt_strictsync, "strictsync" },
153 { Opt_serverino, "serverino" },
154 { Opt_noserverino, "noserverino" },
155 { Opt_rwpidforward, "rwpidforward" },
156 { Opt_cifsacl, "cifsacl" },
157 { Opt_nocifsacl, "nocifsacl" },
158 { Opt_acl, "acl" },
159 { Opt_noacl, "noacl" },
160 { Opt_locallease, "locallease" },
161 { Opt_sign, "sign" },
162 { Opt_seal, "seal" },
163 { Opt_noac, "noac" },
164 { Opt_fsc, "fsc" },
165 { Opt_mfsymlinks, "mfsymlinks" },
166 { Opt_multiuser, "multiuser" },
167 { Opt_sloppy, "sloppy" },
168 { Opt_nosharesock, "nosharesock" },
169
170 { Opt_backupuid, "backupuid=%s" },
171 { Opt_backupgid, "backupgid=%s" },
172 { Opt_uid, "uid=%s" },
173 { Opt_cruid, "cruid=%s" },
174 { Opt_gid, "gid=%s" },
175 { Opt_file_mode, "file_mode=%s" },
176 { Opt_dirmode, "dirmode=%s" },
177 { Opt_dirmode, "dir_mode=%s" },
178 { Opt_port, "port=%s" },
179 { Opt_rsize, "rsize=%s" },
180 { Opt_wsize, "wsize=%s" },
181 { Opt_actimeo, "actimeo=%s" },
182
183 { Opt_blank_user, "user=" },
184 { Opt_blank_user, "username=" },
185 { Opt_user, "user=%s" },
186 { Opt_user, "username=%s" },
187 { Opt_blank_pass, "pass=" },
188 { Opt_blank_pass, "password=" },
189 { Opt_pass, "pass=%s" },
190 { Opt_pass, "password=%s" },
191 { Opt_blank_ip, "ip=" },
192 { Opt_blank_ip, "addr=" },
193 { Opt_ip, "ip=%s" },
194 { Opt_ip, "addr=%s" },
195 { Opt_ignore, "unc=%s" },
196 { Opt_ignore, "target=%s" },
197 { Opt_ignore, "path=%s" },
198 { Opt_domain, "dom=%s" },
199 { Opt_domain, "domain=%s" },
200 { Opt_domain, "workgroup=%s" },
201 { Opt_srcaddr, "srcaddr=%s" },
202 { Opt_ignore, "prefixpath=%s" },
203 { Opt_iocharset, "iocharset=%s" },
204 { Opt_netbiosname, "netbiosname=%s" },
205 { Opt_servern, "servern=%s" },
206 { Opt_ver, "ver=%s" },
207 { Opt_vers, "vers=%s" },
208 { Opt_sec, "sec=%s" },
209 { Opt_cache, "cache=%s" },
210
211 { Opt_ignore, "cred" },
212 { Opt_ignore, "credentials" },
213 { Opt_ignore, "cred=%s" },
214 { Opt_ignore, "credentials=%s" },
215 { Opt_ignore, "guest" },
216 { Opt_ignore, "rw" },
217 { Opt_ignore, "ro" },
218 { Opt_ignore, "suid" },
219 { Opt_ignore, "nosuid" },
220 { Opt_ignore, "exec" },
221 { Opt_ignore, "noexec" },
222 { Opt_ignore, "nodev" },
223 { Opt_ignore, "noauto" },
224 { Opt_ignore, "dev" },
225 { Opt_ignore, "mand" },
226 { Opt_ignore, "nomand" },
227 { Opt_ignore, "_netdev" },
228
229 { Opt_err, NULL }
230};
231
232enum {
233 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
234 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
235 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
236 Opt_sec_ntlmv2i, Opt_sec_lanman,
237 Opt_sec_none,
238
239 Opt_sec_err
240};
241
242static const match_table_t cifs_secflavor_tokens = {
243 { Opt_sec_krb5, "krb5" },
244 { Opt_sec_krb5i, "krb5i" },
245 { Opt_sec_krb5p, "krb5p" },
246 { Opt_sec_ntlmsspi, "ntlmsspi" },
247 { Opt_sec_ntlmssp, "ntlmssp" },
248 { Opt_ntlm, "ntlm" },
249 { Opt_sec_ntlmi, "ntlmi" },
250 { Opt_sec_ntlmv2, "nontlm" },
251 { Opt_sec_ntlmv2, "ntlmv2" },
252 { Opt_sec_ntlmv2i, "ntlmv2i" },
253 { Opt_sec_lanman, "lanman" },
254 { Opt_sec_none, "none" },
255
256 { Opt_sec_err, NULL }
257};
258
259/* cache flavors */
260enum {
261 Opt_cache_loose,
262 Opt_cache_strict,
263 Opt_cache_none,
264 Opt_cache_err
265};
266
267static const match_table_t cifs_cacheflavor_tokens = {
268 { Opt_cache_loose, "loose" },
269 { Opt_cache_strict, "strict" },
270 { Opt_cache_none, "none" },
271 { Opt_cache_err, NULL }
272};
273
274static const match_table_t cifs_smb_version_tokens = {
275 { Smb_1, SMB1_VERSION_STRING },
276 { Smb_20, SMB20_VERSION_STRING},
277 { Smb_21, SMB21_VERSION_STRING },
278 { Smb_30, SMB30_VERSION_STRING },
279 { Smb_302, SMB302_VERSION_STRING },
280};
281
282static int ip_connect(struct TCP_Server_Info *server);
283static int generic_ip_connect(struct TCP_Server_Info *server);
284static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
285static void cifs_prune_tlinks(struct work_struct *work);
286static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
287 const char *devname);
288
289/*
290 * cifs tcp session reconnection
291 *
292 * mark tcp session as reconnecting so temporarily locked
293 * mark all smb sessions as reconnecting for tcp session
294 * reconnect tcp session
295 * wake up waiters on reconnection? - (not needed currently)
296 */
297int
298cifs_reconnect(struct TCP_Server_Info *server)
299{
300 int rc = 0;
301 struct list_head *tmp, *tmp2;
302 struct cifs_ses *ses;
303 struct cifs_tcon *tcon;
304 struct mid_q_entry *mid_entry;
305 struct list_head retry_list;
306
307 spin_lock(&GlobalMid_Lock);
308 if (server->tcpStatus == CifsExiting) {
309 /* the demux thread will exit normally
310 next time through the loop */
311 spin_unlock(&GlobalMid_Lock);
312 return rc;
313 } else
314 server->tcpStatus = CifsNeedReconnect;
315 spin_unlock(&GlobalMid_Lock);
316 server->maxBuf = 0;
317#ifdef CONFIG_CIFS_SMB2
318 server->max_read = 0;
319#endif
320
321 cifs_dbg(FYI, "Reconnecting tcp session\n");
322
323 /* before reconnecting the tcp session, mark the smb session (uid)
324 and the tid bad so they are not used until reconnected */
325 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
326 __func__);
327 spin_lock(&cifs_tcp_ses_lock);
328 list_for_each(tmp, &server->smb_ses_list) {
329 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
330 ses->need_reconnect = true;
331 ses->ipc_tid = 0;
332 list_for_each(tmp2, &ses->tcon_list) {
333 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
334 tcon->need_reconnect = true;
335 }
336 }
337 spin_unlock(&cifs_tcp_ses_lock);
338
339 /* do not want to be sending data on a socket we are freeing */
340 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
341 mutex_lock(&server->srv_mutex);
342 if (server->ssocket) {
343 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
344 server->ssocket->state, server->ssocket->flags);
345 kernel_sock_shutdown(server->ssocket, SHUT_WR);
346 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
347 server->ssocket->state, server->ssocket->flags);
348 sock_release(server->ssocket);
349 server->ssocket = NULL;
350 }
351 server->sequence_number = 0;
352 server->session_estab = false;
353 kfree(server->session_key.response);
354 server->session_key.response = NULL;
355 server->session_key.len = 0;
356 server->lstrp = jiffies;
357 mutex_unlock(&server->srv_mutex);
358
359 /* mark submitted MIDs for retry and issue callback */
360 INIT_LIST_HEAD(&retry_list);
361 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
362 spin_lock(&GlobalMid_Lock);
363 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
364 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
365 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
366 mid_entry->mid_state = MID_RETRY_NEEDED;
367 list_move(&mid_entry->qhead, &retry_list);
368 }
369 spin_unlock(&GlobalMid_Lock);
370
371 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
372 list_for_each_safe(tmp, tmp2, &retry_list) {
373 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
374 list_del_init(&mid_entry->qhead);
375 mid_entry->callback(mid_entry);
376 }
377
378 do {
379 try_to_freeze();
380
381 /* we should try only the port we connected to before */
382 mutex_lock(&server->srv_mutex);
383 rc = generic_ip_connect(server);
384 if (rc) {
385 cifs_dbg(FYI, "reconnect error %d\n", rc);
386 msleep(3000);
387 } else {
388 atomic_inc(&tcpSesReconnectCount);
389 spin_lock(&GlobalMid_Lock);
390 if (server->tcpStatus != CifsExiting)
391 server->tcpStatus = CifsNeedNegotiate;
392 spin_unlock(&GlobalMid_Lock);
393 }
394 mutex_unlock(&server->srv_mutex);
395 } while (server->tcpStatus == CifsNeedReconnect);
396
397 return rc;
398}
399
400static void
401cifs_echo_request(struct work_struct *work)
402{
403 int rc;
404 struct TCP_Server_Info *server = container_of(work,
405 struct TCP_Server_Info, echo.work);
406
407 /*
408 * We cannot send an echo if it is disabled or until the
409 * NEGOTIATE_PROTOCOL request is done, which is indicated by
410 * server->ops->need_neg() == true. Also, no need to ping if
411 * we got a response recently.
412 */
413 if (!server->ops->need_neg || server->ops->need_neg(server) ||
414 (server->ops->can_echo && !server->ops->can_echo(server)) ||
415 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
416 goto requeue_echo;
417
418 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
419 if (rc)
420 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
421 server->hostname);
422
423requeue_echo:
424 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
425}
426
427static bool
428allocate_buffers(struct TCP_Server_Info *server)
429{
430 if (!server->bigbuf) {
431 server->bigbuf = (char *)cifs_buf_get();
432 if (!server->bigbuf) {
433 cifs_dbg(VFS, "No memory for large SMB response\n");
434 msleep(3000);
435 /* retry will check if exiting */
436 return false;
437 }
438 } else if (server->large_buf) {
439 /* we are reusing a dirty large buf, clear its start */
440 memset(server->bigbuf, 0, HEADER_SIZE(server));
441 }
442
443 if (!server->smallbuf) {
444 server->smallbuf = (char *)cifs_small_buf_get();
445 if (!server->smallbuf) {
446 cifs_dbg(VFS, "No memory for SMB response\n");
447 msleep(1000);
448 /* retry will check if exiting */
449 return false;
450 }
451 /* beginning of smb buffer is cleared in our buf_get */
452 } else {
453 /* if existing small buf clear beginning */
454 memset(server->smallbuf, 0, HEADER_SIZE(server));
455 }
456
457 return true;
458}
459
460static bool
461server_unresponsive(struct TCP_Server_Info *server)
462{
463 /*
464 * We need to wait 2 echo intervals to make sure we handle such
465 * situations right:
466 * 1s client sends a normal SMB request
467 * 2s client gets a response
468 * 30s echo workqueue job pops, and decides we got a response recently
469 * and don't need to send another
470 * ...
471 * 65s kernel_recvmsg times out, and we see that we haven't gotten
472 * a response in >60s.
473 */
474 if (server->tcpStatus == CifsGood &&
475 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
476 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
477 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
478 cifs_reconnect(server);
479 wake_up(&server->response_q);
480 return true;
481 }
482
483 return false;
484}
485
486/*
487 * kvec_array_init - clone a kvec array, and advance into it
488 * @new: pointer to memory for cloned array
489 * @iov: pointer to original array
490 * @nr_segs: number of members in original array
491 * @bytes: number of bytes to advance into the cloned array
492 *
493 * This function will copy the array provided in iov to a section of memory
494 * and advance the specified number of bytes into the new array. It returns
495 * the number of segments in the new array. "new" must be at least as big as
496 * the original iov array.
497 */
498static unsigned int
499kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
500 size_t bytes)
501{
502 size_t base = 0;
503
504 while (bytes || !iov->iov_len) {
505 int copy = min(bytes, iov->iov_len);
506
507 bytes -= copy;
508 base += copy;
509 if (iov->iov_len == base) {
510 iov++;
511 nr_segs--;
512 base = 0;
513 }
514 }
515 memcpy(new, iov, sizeof(*iov) * nr_segs);
516 new->iov_base += base;
517 new->iov_len -= base;
518 return nr_segs;
519}
520
521static struct kvec *
522get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
523{
524 struct kvec *new_iov;
525
526 if (server->iov && nr_segs <= server->nr_iov)
527 return server->iov;
528
529 /* not big enough -- allocate a new one and release the old */
530 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
531 if (new_iov) {
532 kfree(server->iov);
533 server->iov = new_iov;
534 server->nr_iov = nr_segs;
535 }
536 return new_iov;
537}
538
539int
540cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
541 unsigned int nr_segs, unsigned int to_read)
542{
543 int length = 0;
544 int total_read;
545 unsigned int segs;
546 struct msghdr smb_msg;
547 struct kvec *iov;
548
549 iov = get_server_iovec(server, nr_segs);
550 if (!iov)
551 return -ENOMEM;
552
553 smb_msg.msg_control = NULL;
554 smb_msg.msg_controllen = 0;
555
556 for (total_read = 0; to_read; total_read += length, to_read -= length) {
557 try_to_freeze();
558
559 if (server_unresponsive(server)) {
560 total_read = -EAGAIN;
561 break;
562 }
563
564 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
565
566 length = kernel_recvmsg(server->ssocket, &smb_msg,
567 iov, segs, to_read, 0);
568
569 if (server->tcpStatus == CifsExiting) {
570 total_read = -ESHUTDOWN;
571 break;
572 } else if (server->tcpStatus == CifsNeedReconnect) {
573 cifs_reconnect(server);
574 total_read = -EAGAIN;
575 break;
576 } else if (length == -ERESTARTSYS ||
577 length == -EAGAIN ||
578 length == -EINTR) {
579 /*
580 * Minimum sleep to prevent looping, allowing socket
581 * to clear and app threads to set tcpStatus
582 * CifsNeedReconnect if server hung.
583 */
584 usleep_range(1000, 2000);
585 length = 0;
586 continue;
587 } else if (length <= 0) {
588 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
589 "got %d", to_read, length);
590 cifs_reconnect(server);
591 total_read = -EAGAIN;
592 break;
593 }
594 }
595 return total_read;
596}
597
598int
599cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
600 unsigned int to_read)
601{
602 struct kvec iov;
603
604 iov.iov_base = buf;
605 iov.iov_len = to_read;
606
607 return cifs_readv_from_socket(server, &iov, 1, to_read);
608}
609
610static bool
611is_smb_response(struct TCP_Server_Info *server, unsigned char type)
612{
613 /*
614 * The first byte big endian of the length field,
615 * is actually not part of the length but the type
616 * with the most common, zero, as regular data.
617 */
618 switch (type) {
619 case RFC1002_SESSION_MESSAGE:
620 /* Regular SMB response */
621 return true;
622 case RFC1002_SESSION_KEEP_ALIVE:
623 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
624 break;
625 case RFC1002_POSITIVE_SESSION_RESPONSE:
626 cifs_dbg(FYI, "RFC 1002 positive session response\n");
627 break;
628 case RFC1002_NEGATIVE_SESSION_RESPONSE:
629 /*
630 * We get this from Windows 98 instead of an error on
631 * SMB negprot response.
632 */
633 cifs_dbg(FYI, "RFC 1002 negative session response\n");
634 /* give server a second to clean up */
635 msleep(1000);
636 /*
637 * Always try 445 first on reconnect since we get NACK
638 * on some if we ever connected to port 139 (the NACK
639 * is since we do not begin with RFC1001 session
640 * initialize frame).
641 */
642 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
643 cifs_reconnect(server);
644 wake_up(&server->response_q);
645 break;
646 default:
647 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
648 cifs_reconnect(server);
649 }
650
651 return false;
652}
653
654void
655dequeue_mid(struct mid_q_entry *mid, bool malformed)
656{
657#ifdef CONFIG_CIFS_STATS2
658 mid->when_received = jiffies;
659#endif
660 spin_lock(&GlobalMid_Lock);
661 if (!malformed)
662 mid->mid_state = MID_RESPONSE_RECEIVED;
663 else
664 mid->mid_state = MID_RESPONSE_MALFORMED;
665 list_del_init(&mid->qhead);
666 spin_unlock(&GlobalMid_Lock);
667}
668
669static void
670handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
671 char *buf, int malformed)
672{
673 if (server->ops->check_trans2 &&
674 server->ops->check_trans2(mid, server, buf, malformed))
675 return;
676 mid->resp_buf = buf;
677 mid->large_buf = server->large_buf;
678 /* Was previous buf put in mpx struct for multi-rsp? */
679 if (!mid->multiRsp) {
680 /* smb buffer will be freed by user thread */
681 if (server->large_buf)
682 server->bigbuf = NULL;
683 else
684 server->smallbuf = NULL;
685 }
686 dequeue_mid(mid, malformed);
687}
688
689static void clean_demultiplex_info(struct TCP_Server_Info *server)
690{
691 int length;
692
693 /* take it off the list, if it's not already */
694 spin_lock(&cifs_tcp_ses_lock);
695 list_del_init(&server->tcp_ses_list);
696 spin_unlock(&cifs_tcp_ses_lock);
697
698 spin_lock(&GlobalMid_Lock);
699 server->tcpStatus = CifsExiting;
700 spin_unlock(&GlobalMid_Lock);
701 wake_up_all(&server->response_q);
702
703 /* check if we have blocked requests that need to free */
704 spin_lock(&server->req_lock);
705 if (server->credits <= 0)
706 server->credits = 1;
707 spin_unlock(&server->req_lock);
708 /*
709 * Although there should not be any requests blocked on this queue it
710 * can not hurt to be paranoid and try to wake up requests that may
711 * haven been blocked when more than 50 at time were on the wire to the
712 * same server - they now will see the session is in exit state and get
713 * out of SendReceive.
714 */
715 wake_up_all(&server->request_q);
716 /* give those requests time to exit */
717 msleep(125);
718
719 if (server->ssocket) {
720 sock_release(server->ssocket);
721 server->ssocket = NULL;
722 }
723
724 if (!list_empty(&server->pending_mid_q)) {
725 struct list_head dispose_list;
726 struct mid_q_entry *mid_entry;
727 struct list_head *tmp, *tmp2;
728
729 INIT_LIST_HEAD(&dispose_list);
730 spin_lock(&GlobalMid_Lock);
731 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
732 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
733 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
734 mid_entry->mid_state = MID_SHUTDOWN;
735 list_move(&mid_entry->qhead, &dispose_list);
736 }
737 spin_unlock(&GlobalMid_Lock);
738
739 /* now walk dispose list and issue callbacks */
740 list_for_each_safe(tmp, tmp2, &dispose_list) {
741 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
742 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
743 list_del_init(&mid_entry->qhead);
744 mid_entry->callback(mid_entry);
745 }
746 /* 1/8th of sec is more than enough time for them to exit */
747 msleep(125);
748 }
749
750 if (!list_empty(&server->pending_mid_q)) {
751 /*
752 * mpx threads have not exited yet give them at least the smb
753 * send timeout time for long ops.
754 *
755 * Due to delays on oplock break requests, we need to wait at
756 * least 45 seconds before giving up on a request getting a
757 * response and going ahead and killing cifsd.
758 */
759 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
760 msleep(46000);
761 /*
762 * If threads still have not exited they are probably never
763 * coming home not much else we can do but free the memory.
764 */
765 }
766
767 kfree(server->hostname);
768 kfree(server->iov);
769 kfree(server);
770
771 length = atomic_dec_return(&tcpSesAllocCount);
772 if (length > 0)
773 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
774 GFP_KERNEL);
775}
776
777static int
778standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
779{
780 int length;
781 char *buf = server->smallbuf;
782 unsigned int pdu_length = get_rfc1002_length(buf);
783
784 /* make sure this will fit in a large buffer */
785 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
786 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
787 cifs_reconnect(server);
788 wake_up(&server->response_q);
789 return -EAGAIN;
790 }
791
792 /* switch to large buffer if too big for a small one */
793 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
794 server->large_buf = true;
795 memcpy(server->bigbuf, buf, server->total_read);
796 buf = server->bigbuf;
797 }
798
799 /* now read the rest */
800 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
801 pdu_length - HEADER_SIZE(server) + 1 + 4);
802 if (length < 0)
803 return length;
804 server->total_read += length;
805
806 dump_smb(buf, server->total_read);
807
808 /*
809 * We know that we received enough to get to the MID as we
810 * checked the pdu_length earlier. Now check to see
811 * if the rest of the header is OK. We borrow the length
812 * var for the rest of the loop to avoid a new stack var.
813 *
814 * 48 bytes is enough to display the header and a little bit
815 * into the payload for debugging purposes.
816 */
817 length = server->ops->check_message(buf, server->total_read);
818 if (length != 0)
819 cifs_dump_mem("Bad SMB: ", buf,
820 min_t(unsigned int, server->total_read, 48));
821
822 if (server->ops->is_status_pending &&
823 server->ops->is_status_pending(buf, server, length))
824 return -1;
825
826 if (!mid)
827 return length;
828
829 handle_mid(mid, server, buf, length);
830 return 0;
831}
832
833static int
834cifs_demultiplex_thread(void *p)
835{
836 int length;
837 struct TCP_Server_Info *server = p;
838 unsigned int pdu_length;
839 char *buf = NULL;
840 struct task_struct *task_to_wake = NULL;
841 struct mid_q_entry *mid_entry;
842
843 current->flags |= PF_MEMALLOC;
844 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
845
846 length = atomic_inc_return(&tcpSesAllocCount);
847 if (length > 1)
848 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
849 GFP_KERNEL);
850
851 set_freezable();
852 while (server->tcpStatus != CifsExiting) {
853 if (try_to_freeze())
854 continue;
855
856 if (!allocate_buffers(server))
857 continue;
858
859 server->large_buf = false;
860 buf = server->smallbuf;
861 pdu_length = 4; /* enough to get RFC1001 header */
862
863 length = cifs_read_from_socket(server, buf, pdu_length);
864 if (length < 0)
865 continue;
866 server->total_read = length;
867
868 /*
869 * The right amount was read from socket - 4 bytes,
870 * so we can now interpret the length field.
871 */
872 pdu_length = get_rfc1002_length(buf);
873
874 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
875 if (!is_smb_response(server, buf[0]))
876 continue;
877
878 /* make sure we have enough to get to the MID */
879 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
880 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
881 pdu_length);
882 cifs_reconnect(server);
883 wake_up(&server->response_q);
884 continue;
885 }
886
887 /* read down to the MID */
888 length = cifs_read_from_socket(server, buf + 4,
889 HEADER_SIZE(server) - 1 - 4);
890 if (length < 0)
891 continue;
892 server->total_read += length;
893
894 mid_entry = server->ops->find_mid(server, buf);
895
896 if (!mid_entry || !mid_entry->receive)
897 length = standard_receive3(server, mid_entry);
898 else
899 length = mid_entry->receive(server, mid_entry);
900
901 if (length < 0)
902 continue;
903
904 if (server->large_buf)
905 buf = server->bigbuf;
906
907 server->lstrp = jiffies;
908 if (mid_entry != NULL) {
909 if (!mid_entry->multiRsp || mid_entry->multiEnd)
910 mid_entry->callback(mid_entry);
911 } else if (!server->ops->is_oplock_break ||
912 !server->ops->is_oplock_break(buf, server)) {
913 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
914 atomic_read(&midCount));
915 cifs_dump_mem("Received Data is: ", buf,
916 HEADER_SIZE(server));
917#ifdef CONFIG_CIFS_DEBUG2
918 if (server->ops->dump_detail)
919 server->ops->dump_detail(buf);
920 cifs_dump_mids(server);
921#endif /* CIFS_DEBUG2 */
922
923 }
924 } /* end while !EXITING */
925
926 /* buffer usually freed in free_mid - need to free it here on exit */
927 cifs_buf_release(server->bigbuf);
928 if (server->smallbuf) /* no sense logging a debug message if NULL */
929 cifs_small_buf_release(server->smallbuf);
930
931 task_to_wake = xchg(&server->tsk, NULL);
932 clean_demultiplex_info(server);
933
934 /* if server->tsk was NULL then wait for a signal before exiting */
935 if (!task_to_wake) {
936 set_current_state(TASK_INTERRUPTIBLE);
937 while (!signal_pending(current)) {
938 schedule();
939 set_current_state(TASK_INTERRUPTIBLE);
940 }
941 set_current_state(TASK_RUNNING);
942 }
943
944 module_put_and_exit(0);
945}
946
947/* extract the host portion of the UNC string */
948static char *
949extract_hostname(const char *unc)
950{
951 const char *src;
952 char *dst, *delim;
953 unsigned int len;
954
955 /* skip double chars at beginning of string */
956 /* BB: check validity of these bytes? */
957 src = unc + 2;
958
959 /* delimiter between hostname and sharename is always '\\' now */
960 delim = strchr(src, '\\');
961 if (!delim)
962 return ERR_PTR(-EINVAL);
963
964 len = delim - src;
965 dst = kmalloc((len + 1), GFP_KERNEL);
966 if (dst == NULL)
967 return ERR_PTR(-ENOMEM);
968
969 memcpy(dst, src, len);
970 dst[len] = '\0';
971
972 return dst;
973}
974
975static int get_option_ul(substring_t args[], unsigned long *option)
976{
977 int rc;
978 char *string;
979
980 string = match_strdup(args);
981 if (string == NULL)
982 return -ENOMEM;
983 rc = kstrtoul(string, 0, option);
984 kfree(string);
985
986 return rc;
987}
988
989static int get_option_uid(substring_t args[], kuid_t *result)
990{
991 unsigned long value;
992 kuid_t uid;
993 int rc;
994
995 rc = get_option_ul(args, &value);
996 if (rc)
997 return rc;
998
999 uid = make_kuid(current_user_ns(), value);
1000 if (!uid_valid(uid))
1001 return -EINVAL;
1002
1003 *result = uid;
1004 return 0;
1005}
1006
1007static int get_option_gid(substring_t args[], kgid_t *result)
1008{
1009 unsigned long value;
1010 kgid_t gid;
1011 int rc;
1012
1013 rc = get_option_ul(args, &value);
1014 if (rc)
1015 return rc;
1016
1017 gid = make_kgid(current_user_ns(), value);
1018 if (!gid_valid(gid))
1019 return -EINVAL;
1020
1021 *result = gid;
1022 return 0;
1023}
1024
1025static int cifs_parse_security_flavors(char *value,
1026 struct smb_vol *vol)
1027{
1028
1029 substring_t args[MAX_OPT_ARGS];
1030
1031 /*
1032 * With mount options, the last one should win. Reset any existing
1033 * settings back to default.
1034 */
1035 vol->sectype = Unspecified;
1036 vol->sign = false;
1037
1038 switch (match_token(value, cifs_secflavor_tokens, args)) {
1039 case Opt_sec_krb5p:
1040 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1041 return 1;
1042 case Opt_sec_krb5i:
1043 vol->sign = true;
1044 /* Fallthrough */
1045 case Opt_sec_krb5:
1046 vol->sectype = Kerberos;
1047 break;
1048 case Opt_sec_ntlmsspi:
1049 vol->sign = true;
1050 /* Fallthrough */
1051 case Opt_sec_ntlmssp:
1052 vol->sectype = RawNTLMSSP;
1053 break;
1054 case Opt_sec_ntlmi:
1055 vol->sign = true;
1056 /* Fallthrough */
1057 case Opt_ntlm:
1058 vol->sectype = NTLM;
1059 break;
1060 case Opt_sec_ntlmv2i:
1061 vol->sign = true;
1062 /* Fallthrough */
1063 case Opt_sec_ntlmv2:
1064 vol->sectype = NTLMv2;
1065 break;
1066#ifdef CONFIG_CIFS_WEAK_PW_HASH
1067 case Opt_sec_lanman:
1068 vol->sectype = LANMAN;
1069 break;
1070#endif
1071 case Opt_sec_none:
1072 vol->nullauth = 1;
1073 break;
1074 default:
1075 cifs_dbg(VFS, "bad security option: %s\n", value);
1076 return 1;
1077 }
1078
1079 return 0;
1080}
1081
1082static int
1083cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1084{
1085 substring_t args[MAX_OPT_ARGS];
1086
1087 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1088 case Opt_cache_loose:
1089 vol->direct_io = false;
1090 vol->strict_io = false;
1091 break;
1092 case Opt_cache_strict:
1093 vol->direct_io = false;
1094 vol->strict_io = true;
1095 break;
1096 case Opt_cache_none:
1097 vol->direct_io = true;
1098 vol->strict_io = false;
1099 break;
1100 default:
1101 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1102 return 1;
1103 }
1104 return 0;
1105}
1106
1107static int
1108cifs_parse_smb_version(char *value, struct smb_vol *vol)
1109{
1110 substring_t args[MAX_OPT_ARGS];
1111
1112 switch (match_token(value, cifs_smb_version_tokens, args)) {
1113 case Smb_1:
1114 vol->ops = &smb1_operations;
1115 vol->vals = &smb1_values;
1116 break;
1117#ifdef CONFIG_CIFS_SMB2
1118 case Smb_20:
1119 vol->ops = &smb20_operations;
1120 vol->vals = &smb20_values;
1121 break;
1122 case Smb_21:
1123 vol->ops = &smb21_operations;
1124 vol->vals = &smb21_values;
1125 break;
1126 case Smb_30:
1127 vol->ops = &smb30_operations;
1128 vol->vals = &smb30_values;
1129 break;
1130 case Smb_302:
1131 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1132 vol->vals = &smb302_values;
1133 break;
1134#endif
1135 default:
1136 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1137 return 1;
1138 }
1139 return 0;
1140}
1141
1142/*
1143 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1144 * fields with the result. Returns 0 on success and an error otherwise.
1145 */
1146static int
1147cifs_parse_devname(const char *devname, struct smb_vol *vol)
1148{
1149 char *pos;
1150 const char *delims = "/\\";
1151 size_t len;
1152
1153 /* make sure we have a valid UNC double delimiter prefix */
1154 len = strspn(devname, delims);
1155 if (len != 2)
1156 return -EINVAL;
1157
1158 /* find delimiter between host and sharename */
1159 pos = strpbrk(devname + 2, delims);
1160 if (!pos)
1161 return -EINVAL;
1162
1163 /* skip past delimiter */
1164 ++pos;
1165
1166 /* now go until next delimiter or end of string */
1167 len = strcspn(pos, delims);
1168
1169 /* move "pos" up to delimiter or NULL */
1170 pos += len;
1171 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1172 if (!vol->UNC)
1173 return -ENOMEM;
1174
1175 convert_delimiter(vol->UNC, '\\');
1176
1177 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1178 if (!*pos++ || !*pos)
1179 return 0;
1180
1181 vol->prepath = kstrdup(pos, GFP_KERNEL);
1182 if (!vol->prepath)
1183 return -ENOMEM;
1184
1185 return 0;
1186}
1187
1188static int
1189cifs_parse_mount_options(const char *mountdata, const char *devname,
1190 struct smb_vol *vol)
1191{
1192 char *data, *end;
1193 char *mountdata_copy = NULL, *options;
1194 unsigned int temp_len, i, j;
1195 char separator[2];
1196 short int override_uid = -1;
1197 short int override_gid = -1;
1198 bool uid_specified = false;
1199 bool gid_specified = false;
1200 bool sloppy = false;
1201 char *invalid = NULL;
1202 char *nodename = utsname()->nodename;
1203 char *string = NULL;
1204 char *tmp_end, *value;
1205 char delim;
1206 bool got_ip = false;
1207 unsigned short port = 0;
1208 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1209
1210 separator[0] = ',';
1211 separator[1] = 0;
1212 delim = separator[0];
1213
1214 /* ensure we always start with zeroed-out smb_vol */
1215 memset(vol, 0, sizeof(*vol));
1216
1217 /*
1218 * does not have to be perfect mapping since field is
1219 * informational, only used for servers that do not support
1220 * port 445 and it can be overridden at mount time
1221 */
1222 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1223 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1224 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1225
1226 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1227 /* null target name indicates to use *SMBSERVR default called name
1228 if we end up sending RFC1001 session initialize */
1229 vol->target_rfc1001_name[0] = 0;
1230 vol->cred_uid = current_uid();
1231 vol->linux_uid = current_uid();
1232 vol->linux_gid = current_gid();
1233
1234 /* default to only allowing write access to owner of the mount */
1235 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1236
1237 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1238 /* default is always to request posix paths. */
1239 vol->posix_paths = 1;
1240 /* default to using server inode numbers where available */
1241 vol->server_ino = 1;
1242
1243 /* default is to use strict cifs caching semantics */
1244 vol->strict_io = true;
1245
1246 vol->actimeo = CIFS_DEF_ACTIMEO;
1247
1248 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1249 vol->ops = &smb1_operations;
1250 vol->vals = &smb1_values;
1251
1252 if (!mountdata)
1253 goto cifs_parse_mount_err;
1254
1255 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1256 if (!mountdata_copy)
1257 goto cifs_parse_mount_err;
1258
1259 options = mountdata_copy;
1260 end = options + strlen(options);
1261
1262 if (strncmp(options, "sep=", 4) == 0) {
1263 if (options[4] != 0) {
1264 separator[0] = options[4];
1265 options += 5;
1266 } else {
1267 cifs_dbg(FYI, "Null separator not allowed\n");
1268 }
1269 }
1270 vol->backupuid_specified = false; /* no backup intent for a user */
1271 vol->backupgid_specified = false; /* no backup intent for a group */
1272
1273 switch (cifs_parse_devname(devname, vol)) {
1274 case 0:
1275 break;
1276 case -ENOMEM:
1277 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1278 goto cifs_parse_mount_err;
1279 case -EINVAL:
1280 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1281 goto cifs_parse_mount_err;
1282 default:
1283 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1284 goto cifs_parse_mount_err;
1285 }
1286
1287 while ((data = strsep(&options, separator)) != NULL) {
1288 substring_t args[MAX_OPT_ARGS];
1289 unsigned long option;
1290 int token;
1291
1292 if (!*data)
1293 continue;
1294
1295 token = match_token(data, cifs_mount_option_tokens, args);
1296
1297 switch (token) {
1298
1299 /* Ingnore the following */
1300 case Opt_ignore:
1301 break;
1302
1303 /* Boolean values */
1304 case Opt_user_xattr:
1305 vol->no_xattr = 0;
1306 break;
1307 case Opt_nouser_xattr:
1308 vol->no_xattr = 1;
1309 break;
1310 case Opt_forceuid:
1311 override_uid = 1;
1312 break;
1313 case Opt_noforceuid:
1314 override_uid = 0;
1315 break;
1316 case Opt_forcegid:
1317 override_gid = 1;
1318 break;
1319 case Opt_noforcegid:
1320 override_gid = 0;
1321 break;
1322 case Opt_noblocksend:
1323 vol->noblocksnd = 1;
1324 break;
1325 case Opt_noautotune:
1326 vol->noautotune = 1;
1327 break;
1328 case Opt_hard:
1329 vol->retry = 1;
1330 break;
1331 case Opt_soft:
1332 vol->retry = 0;
1333 break;
1334 case Opt_perm:
1335 vol->noperm = 0;
1336 break;
1337 case Opt_noperm:
1338 vol->noperm = 1;
1339 break;
1340 case Opt_mapchars:
1341 vol->remap = 1;
1342 break;
1343 case Opt_nomapchars:
1344 vol->remap = 0;
1345 break;
1346 case Opt_sfu:
1347 vol->sfu_emul = 1;
1348 break;
1349 case Opt_nosfu:
1350 vol->sfu_emul = 0;
1351 break;
1352 case Opt_nodfs:
1353 vol->nodfs = 1;
1354 break;
1355 case Opt_posixpaths:
1356 vol->posix_paths = 1;
1357 break;
1358 case Opt_noposixpaths:
1359 vol->posix_paths = 0;
1360 break;
1361 case Opt_nounix:
1362 vol->no_linux_ext = 1;
1363 break;
1364 case Opt_nocase:
1365 vol->nocase = 1;
1366 break;
1367 case Opt_brl:
1368 vol->nobrl = 0;
1369 break;
1370 case Opt_nobrl:
1371 vol->nobrl = 1;
1372 /*
1373 * turn off mandatory locking in mode
1374 * if remote locking is turned off since the
1375 * local vfs will do advisory
1376 */
1377 if (vol->file_mode ==
1378 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1379 vol->file_mode = S_IALLUGO;
1380 break;
1381 case Opt_forcemandatorylock:
1382 vol->mand_lock = 1;
1383 break;
1384 case Opt_setuids:
1385 vol->setuids = 1;
1386 break;
1387 case Opt_nosetuids:
1388 vol->setuids = 0;
1389 break;
1390 case Opt_dynperm:
1391 vol->dynperm = true;
1392 break;
1393 case Opt_nodynperm:
1394 vol->dynperm = false;
1395 break;
1396 case Opt_nohard:
1397 vol->retry = 0;
1398 break;
1399 case Opt_nosoft:
1400 vol->retry = 1;
1401 break;
1402 case Opt_nointr:
1403 vol->intr = 0;
1404 break;
1405 case Opt_intr:
1406 vol->intr = 1;
1407 break;
1408 case Opt_nostrictsync:
1409 vol->nostrictsync = 1;
1410 break;
1411 case Opt_strictsync:
1412 vol->nostrictsync = 0;
1413 break;
1414 case Opt_serverino:
1415 vol->server_ino = 1;
1416 break;
1417 case Opt_noserverino:
1418 vol->server_ino = 0;
1419 break;
1420 case Opt_rwpidforward:
1421 vol->rwpidforward = 1;
1422 break;
1423 case Opt_cifsacl:
1424 vol->cifs_acl = 1;
1425 break;
1426 case Opt_nocifsacl:
1427 vol->cifs_acl = 0;
1428 break;
1429 case Opt_acl:
1430 vol->no_psx_acl = 0;
1431 break;
1432 case Opt_noacl:
1433 vol->no_psx_acl = 1;
1434 break;
1435 case Opt_locallease:
1436 vol->local_lease = 1;
1437 break;
1438 case Opt_sign:
1439 vol->sign = true;
1440 break;
1441 case Opt_seal:
1442 /* we do not do the following in secFlags because seal
1443 * is a per tree connection (mount) not a per socket
1444 * or per-smb connection option in the protocol
1445 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1446 */
1447 vol->seal = 1;
1448 break;
1449 case Opt_noac:
1450 printk(KERN_WARNING "CIFS: Mount option noac not "
1451 "supported. Instead set "
1452 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1453 break;
1454 case Opt_fsc:
1455#ifndef CONFIG_CIFS_FSCACHE
1456 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1457 goto cifs_parse_mount_err;
1458#endif
1459 vol->fsc = true;
1460 break;
1461 case Opt_mfsymlinks:
1462 vol->mfsymlinks = true;
1463 break;
1464 case Opt_multiuser:
1465 vol->multiuser = true;
1466 break;
1467 case Opt_sloppy:
1468 sloppy = true;
1469 break;
1470 case Opt_nosharesock:
1471 vol->nosharesock = true;
1472 break;
1473
1474 /* Numeric Values */
1475 case Opt_backupuid:
1476 if (get_option_uid(args, &vol->backupuid)) {
1477 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1478 __func__);
1479 goto cifs_parse_mount_err;
1480 }
1481 vol->backupuid_specified = true;
1482 break;
1483 case Opt_backupgid:
1484 if (get_option_gid(args, &vol->backupgid)) {
1485 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1486 __func__);
1487 goto cifs_parse_mount_err;
1488 }
1489 vol->backupgid_specified = true;
1490 break;
1491 case Opt_uid:
1492 if (get_option_uid(args, &vol->linux_uid)) {
1493 cifs_dbg(VFS, "%s: Invalid uid value\n",
1494 __func__);
1495 goto cifs_parse_mount_err;
1496 }
1497 uid_specified = true;
1498 break;
1499 case Opt_cruid:
1500 if (get_option_uid(args, &vol->cred_uid)) {
1501 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1502 __func__);
1503 goto cifs_parse_mount_err;
1504 }
1505 break;
1506 case Opt_gid:
1507 if (get_option_gid(args, &vol->linux_gid)) {
1508 cifs_dbg(VFS, "%s: Invalid gid value\n",
1509 __func__);
1510 goto cifs_parse_mount_err;
1511 }
1512 gid_specified = true;
1513 break;
1514 case Opt_file_mode:
1515 if (get_option_ul(args, &option)) {
1516 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1517 __func__);
1518 goto cifs_parse_mount_err;
1519 }
1520 vol->file_mode = option;
1521 break;
1522 case Opt_dirmode:
1523 if (get_option_ul(args, &option)) {
1524 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1525 __func__);
1526 goto cifs_parse_mount_err;
1527 }
1528 vol->dir_mode = option;
1529 break;
1530 case Opt_port:
1531 if (get_option_ul(args, &option) ||
1532 option > USHRT_MAX) {
1533 cifs_dbg(VFS, "%s: Invalid port value\n",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 port = (unsigned short)option;
1538 break;
1539 case Opt_rsize:
1540 if (get_option_ul(args, &option)) {
1541 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 vol->rsize = option;
1546 break;
1547 case Opt_wsize:
1548 if (get_option_ul(args, &option)) {
1549 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1550 __func__);
1551 goto cifs_parse_mount_err;
1552 }
1553 vol->wsize = option;
1554 break;
1555 case Opt_actimeo:
1556 if (get_option_ul(args, &option)) {
1557 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1558 __func__);
1559 goto cifs_parse_mount_err;
1560 }
1561 vol->actimeo = HZ * option;
1562 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1563 cifs_dbg(VFS, "attribute cache timeout too large\n");
1564 goto cifs_parse_mount_err;
1565 }
1566 break;
1567
1568 /* String Arguments */
1569
1570 case Opt_blank_user:
1571 /* null user, ie. anonymous authentication */
1572 vol->nullauth = 1;
1573 vol->username = NULL;
1574 break;
1575 case Opt_user:
1576 string = match_strdup(args);
1577 if (string == NULL)
1578 goto out_nomem;
1579
1580 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1581 CIFS_MAX_USERNAME_LEN) {
1582 printk(KERN_WARNING "CIFS: username too long\n");
1583 goto cifs_parse_mount_err;
1584 }
1585 vol->username = kstrdup(string, GFP_KERNEL);
1586 if (!vol->username)
1587 goto cifs_parse_mount_err;
1588 break;
1589 case Opt_blank_pass:
1590 /* passwords have to be handled differently
1591 * to allow the character used for deliminator
1592 * to be passed within them
1593 */
1594
1595 /*
1596 * Check if this is a case where the password
1597 * starts with a delimiter
1598 */
1599 tmp_end = strchr(data, '=');
1600 tmp_end++;
1601 if (!(tmp_end < end && tmp_end[1] == delim)) {
1602 /* No it is not. Set the password to NULL */
1603 vol->password = NULL;
1604 break;
1605 }
1606 /* Yes it is. Drop down to Opt_pass below.*/
1607 case Opt_pass:
1608 /* Obtain the value string */
1609 value = strchr(data, '=');
1610 value++;
1611
1612 /* Set tmp_end to end of the string */
1613 tmp_end = (char *) value + strlen(value);
1614
1615 /* Check if following character is the deliminator
1616 * If yes, we have encountered a double deliminator
1617 * reset the NULL character to the deliminator
1618 */
1619 if (tmp_end < end && tmp_end[1] == delim) {
1620 tmp_end[0] = delim;
1621
1622 /* Keep iterating until we get to a single
1623 * deliminator OR the end
1624 */
1625 while ((tmp_end = strchr(tmp_end, delim))
1626 != NULL && (tmp_end[1] == delim)) {
1627 tmp_end = (char *) &tmp_end[2];
1628 }
1629
1630 /* Reset var options to point to next element */
1631 if (tmp_end) {
1632 tmp_end[0] = '\0';
1633 options = (char *) &tmp_end[1];
1634 } else
1635 /* Reached the end of the mount option
1636 * string */
1637 options = end;
1638 }
1639
1640 /* Now build new password string */
1641 temp_len = strlen(value);
1642 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1643 if (vol->password == NULL) {
1644 printk(KERN_WARNING "CIFS: no memory "
1645 "for password\n");
1646 goto cifs_parse_mount_err;
1647 }
1648
1649 for (i = 0, j = 0; i < temp_len; i++, j++) {
1650 vol->password[j] = value[i];
1651 if ((value[i] == delim) &&
1652 value[i+1] == delim)
1653 /* skip the second deliminator */
1654 i++;
1655 }
1656 vol->password[j] = '\0';
1657 break;
1658 case Opt_blank_ip:
1659 /* FIXME: should this be an error instead? */
1660 got_ip = false;
1661 break;
1662 case Opt_ip:
1663 string = match_strdup(args);
1664 if (string == NULL)
1665 goto out_nomem;
1666
1667 if (!cifs_convert_address(dstaddr, string,
1668 strlen(string))) {
1669 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1670 string);
1671 goto cifs_parse_mount_err;
1672 }
1673 got_ip = true;
1674 break;
1675 case Opt_domain:
1676 string = match_strdup(args);
1677 if (string == NULL)
1678 goto out_nomem;
1679
1680 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1681 == CIFS_MAX_DOMAINNAME_LEN) {
1682 printk(KERN_WARNING "CIFS: domain name too"
1683 " long\n");
1684 goto cifs_parse_mount_err;
1685 }
1686
1687 vol->domainname = kstrdup(string, GFP_KERNEL);
1688 if (!vol->domainname) {
1689 printk(KERN_WARNING "CIFS: no memory "
1690 "for domainname\n");
1691 goto cifs_parse_mount_err;
1692 }
1693 cifs_dbg(FYI, "Domain name set\n");
1694 break;
1695 case Opt_srcaddr:
1696 string = match_strdup(args);
1697 if (string == NULL)
1698 goto out_nomem;
1699
1700 if (!cifs_convert_address(
1701 (struct sockaddr *)&vol->srcaddr,
1702 string, strlen(string))) {
1703 printk(KERN_WARNING "CIFS: Could not parse"
1704 " srcaddr: %s\n", string);
1705 goto cifs_parse_mount_err;
1706 }
1707 break;
1708 case Opt_iocharset:
1709 string = match_strdup(args);
1710 if (string == NULL)
1711 goto out_nomem;
1712
1713 if (strnlen(string, 1024) >= 65) {
1714 printk(KERN_WARNING "CIFS: iocharset name "
1715 "too long.\n");
1716 goto cifs_parse_mount_err;
1717 }
1718
1719 if (strnicmp(string, "default", 7) != 0) {
1720 vol->iocharset = kstrdup(string,
1721 GFP_KERNEL);
1722 if (!vol->iocharset) {
1723 printk(KERN_WARNING "CIFS: no memory"
1724 "for charset\n");
1725 goto cifs_parse_mount_err;
1726 }
1727 }
1728 /* if iocharset not set then load_nls_default
1729 * is used by caller
1730 */
1731 cifs_dbg(FYI, "iocharset set to %s\n", string);
1732 break;
1733 case Opt_netbiosname:
1734 string = match_strdup(args);
1735 if (string == NULL)
1736 goto out_nomem;
1737
1738 memset(vol->source_rfc1001_name, 0x20,
1739 RFC1001_NAME_LEN);
1740 /*
1741 * FIXME: are there cases in which a comma can
1742 * be valid in workstation netbios name (and
1743 * need special handling)?
1744 */
1745 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1746 /* don't ucase netbiosname for user */
1747 if (string[i] == 0)
1748 break;
1749 vol->source_rfc1001_name[i] = string[i];
1750 }
1751 /* The string has 16th byte zero still from
1752 * set at top of the function
1753 */
1754 if (i == RFC1001_NAME_LEN && string[i] != 0)
1755 printk(KERN_WARNING "CIFS: netbiosname"
1756 " longer than 15 truncated.\n");
1757
1758 break;
1759 case Opt_servern:
1760 /* servernetbiosname specified override *SMBSERVER */
1761 string = match_strdup(args);
1762 if (string == NULL)
1763 goto out_nomem;
1764
1765 /* last byte, type, is 0x20 for servr type */
1766 memset(vol->target_rfc1001_name, 0x20,
1767 RFC1001_NAME_LEN_WITH_NULL);
1768
1769 /* BB are there cases in which a comma can be
1770 valid in this workstation netbios name
1771 (and need special handling)? */
1772
1773 /* user or mount helper must uppercase the
1774 netbios name */
1775 for (i = 0; i < 15; i++) {
1776 if (string[i] == 0)
1777 break;
1778 vol->target_rfc1001_name[i] = string[i];
1779 }
1780 /* The string has 16th byte zero still from
1781 set at top of the function */
1782 if (i == RFC1001_NAME_LEN && string[i] != 0)
1783 printk(KERN_WARNING "CIFS: server net"
1784 "biosname longer than 15 truncated.\n");
1785 break;
1786 case Opt_ver:
1787 string = match_strdup(args);
1788 if (string == NULL)
1789 goto out_nomem;
1790
1791 if (strnicmp(string, "1", 1) == 0) {
1792 /* This is the default */
1793 break;
1794 }
1795 /* For all other value, error */
1796 printk(KERN_WARNING "CIFS: Invalid version"
1797 " specified\n");
1798 goto cifs_parse_mount_err;
1799 case Opt_vers:
1800 string = match_strdup(args);
1801 if (string == NULL)
1802 goto out_nomem;
1803
1804 if (cifs_parse_smb_version(string, vol) != 0)
1805 goto cifs_parse_mount_err;
1806 break;
1807 case Opt_sec:
1808 string = match_strdup(args);
1809 if (string == NULL)
1810 goto out_nomem;
1811
1812 if (cifs_parse_security_flavors(string, vol) != 0)
1813 goto cifs_parse_mount_err;
1814 break;
1815 case Opt_cache:
1816 string = match_strdup(args);
1817 if (string == NULL)
1818 goto out_nomem;
1819
1820 if (cifs_parse_cache_flavor(string, vol) != 0)
1821 goto cifs_parse_mount_err;
1822 break;
1823 default:
1824 /*
1825 * An option we don't recognize. Save it off for later
1826 * if we haven't already found one
1827 */
1828 if (!invalid)
1829 invalid = data;
1830 break;
1831 }
1832 /* Free up any allocated string */
1833 kfree(string);
1834 string = NULL;
1835 }
1836
1837 if (!sloppy && invalid) {
1838 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1839 goto cifs_parse_mount_err;
1840 }
1841
1842#ifndef CONFIG_KEYS
1843 /* Muliuser mounts require CONFIG_KEYS support */
1844 if (vol->multiuser) {
1845 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1846 goto cifs_parse_mount_err;
1847 }
1848#endif
1849 if (!vol->UNC) {
1850 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1851 goto cifs_parse_mount_err;
1852 }
1853
1854 /* make sure UNC has a share name */
1855 if (!strchr(vol->UNC + 3, '\\')) {
1856 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1857 goto cifs_parse_mount_err;
1858 }
1859
1860 if (!got_ip) {
1861 /* No ip= option specified? Try to get it from UNC */
1862 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1863 strlen(&vol->UNC[2]))) {
1864 printk(KERN_ERR "Unable to determine destination "
1865 "address.\n");
1866 goto cifs_parse_mount_err;
1867 }
1868 }
1869
1870 /* set the port that we got earlier */
1871 cifs_set_port(dstaddr, port);
1872
1873 if (uid_specified)
1874 vol->override_uid = override_uid;
1875 else if (override_uid == 1)
1876 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1877 "specified with no uid= option.\n");
1878
1879 if (gid_specified)
1880 vol->override_gid = override_gid;
1881 else if (override_gid == 1)
1882 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1883 "specified with no gid= option.\n");
1884
1885 kfree(mountdata_copy);
1886 return 0;
1887
1888out_nomem:
1889 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1890cifs_parse_mount_err:
1891 kfree(string);
1892 kfree(mountdata_copy);
1893 return 1;
1894}
1895
1896/** Returns true if srcaddr isn't specified and rhs isn't
1897 * specified, or if srcaddr is specified and
1898 * matches the IP address of the rhs argument.
1899 */
1900static bool
1901srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1902{
1903 switch (srcaddr->sa_family) {
1904 case AF_UNSPEC:
1905 return (rhs->sa_family == AF_UNSPEC);
1906 case AF_INET: {
1907 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1908 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1909 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1910 }
1911 case AF_INET6: {
1912 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1913 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1914 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1915 }
1916 default:
1917 WARN_ON(1);
1918 return false; /* don't expect to be here */
1919 }
1920}
1921
1922/*
1923 * If no port is specified in addr structure, we try to match with 445 port
1924 * and if it fails - with 139 ports. It should be called only if address
1925 * families of server and addr are equal.
1926 */
1927static bool
1928match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1929{
1930 __be16 port, *sport;
1931
1932 switch (addr->sa_family) {
1933 case AF_INET:
1934 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1935 port = ((struct sockaddr_in *) addr)->sin_port;
1936 break;
1937 case AF_INET6:
1938 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1939 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1940 break;
1941 default:
1942 WARN_ON(1);
1943 return false;
1944 }
1945
1946 if (!port) {
1947 port = htons(CIFS_PORT);
1948 if (port == *sport)
1949 return true;
1950
1951 port = htons(RFC1001_PORT);
1952 }
1953
1954 return port == *sport;
1955}
1956
1957static bool
1958match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1959 struct sockaddr *srcaddr)
1960{
1961 switch (addr->sa_family) {
1962 case AF_INET: {
1963 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1964 struct sockaddr_in *srv_addr4 =
1965 (struct sockaddr_in *)&server->dstaddr;
1966
1967 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1968 return false;
1969 break;
1970 }
1971 case AF_INET6: {
1972 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1973 struct sockaddr_in6 *srv_addr6 =
1974 (struct sockaddr_in6 *)&server->dstaddr;
1975
1976 if (!ipv6_addr_equal(&addr6->sin6_addr,
1977 &srv_addr6->sin6_addr))
1978 return false;
1979 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1980 return false;
1981 break;
1982 }
1983 default:
1984 WARN_ON(1);
1985 return false; /* don't expect to be here */
1986 }
1987
1988 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1989 return false;
1990
1991 return true;
1992}
1993
1994static bool
1995match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1996{
1997 /*
1998 * The select_sectype function should either return the vol->sectype
1999 * that was specified, or "Unspecified" if that sectype was not
2000 * compatible with the given NEGOTIATE request.
2001 */
2002 if (select_sectype(server, vol->sectype) == Unspecified)
2003 return false;
2004
2005 /*
2006 * Now check if signing mode is acceptable. No need to check
2007 * global_secflags at this point since if MUST_SIGN is set then
2008 * the server->sign had better be too.
2009 */
2010 if (vol->sign && !server->sign)
2011 return false;
2012
2013 return true;
2014}
2015
2016static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2017{
2018 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2019
2020 if (vol->nosharesock)
2021 return 0;
2022
2023 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2024 return 0;
2025
2026 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2027 return 0;
2028
2029 if (!match_address(server, addr,
2030 (struct sockaddr *)&vol->srcaddr))
2031 return 0;
2032
2033 if (!match_port(server, addr))
2034 return 0;
2035
2036 if (!match_security(server, vol))
2037 return 0;
2038
2039 return 1;
2040}
2041
2042static struct TCP_Server_Info *
2043cifs_find_tcp_session(struct smb_vol *vol)
2044{
2045 struct TCP_Server_Info *server;
2046
2047 spin_lock(&cifs_tcp_ses_lock);
2048 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2049 if (!match_server(server, vol))
2050 continue;
2051
2052 ++server->srv_count;
2053 spin_unlock(&cifs_tcp_ses_lock);
2054 cifs_dbg(FYI, "Existing tcp session with server found\n");
2055 return server;
2056 }
2057 spin_unlock(&cifs_tcp_ses_lock);
2058 return NULL;
2059}
2060
2061static void
2062cifs_put_tcp_session(struct TCP_Server_Info *server)
2063{
2064 struct task_struct *task;
2065
2066 spin_lock(&cifs_tcp_ses_lock);
2067 if (--server->srv_count > 0) {
2068 spin_unlock(&cifs_tcp_ses_lock);
2069 return;
2070 }
2071
2072 put_net(cifs_net_ns(server));
2073
2074 list_del_init(&server->tcp_ses_list);
2075 spin_unlock(&cifs_tcp_ses_lock);
2076
2077 cancel_delayed_work_sync(&server->echo);
2078
2079 spin_lock(&GlobalMid_Lock);
2080 server->tcpStatus = CifsExiting;
2081 spin_unlock(&GlobalMid_Lock);
2082
2083 cifs_crypto_shash_release(server);
2084 cifs_fscache_release_client_cookie(server);
2085
2086 kfree(server->session_key.response);
2087 server->session_key.response = NULL;
2088 server->session_key.len = 0;
2089
2090 task = xchg(&server->tsk, NULL);
2091 if (task)
2092 force_sig(SIGKILL, task);
2093}
2094
2095static struct TCP_Server_Info *
2096cifs_get_tcp_session(struct smb_vol *volume_info)
2097{
2098 struct TCP_Server_Info *tcp_ses = NULL;
2099 int rc;
2100
2101 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2102
2103 /* see if we already have a matching tcp_ses */
2104 tcp_ses = cifs_find_tcp_session(volume_info);
2105 if (tcp_ses)
2106 return tcp_ses;
2107
2108 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2109 if (!tcp_ses) {
2110 rc = -ENOMEM;
2111 goto out_err;
2112 }
2113
2114 tcp_ses->ops = volume_info->ops;
2115 tcp_ses->vals = volume_info->vals;
2116 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2117 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2118 if (IS_ERR(tcp_ses->hostname)) {
2119 rc = PTR_ERR(tcp_ses->hostname);
2120 goto out_err_crypto_release;
2121 }
2122
2123 tcp_ses->noblocksnd = volume_info->noblocksnd;
2124 tcp_ses->noautotune = volume_info->noautotune;
2125 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2126 tcp_ses->in_flight = 0;
2127 tcp_ses->credits = 1;
2128 init_waitqueue_head(&tcp_ses->response_q);
2129 init_waitqueue_head(&tcp_ses->request_q);
2130 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2131 mutex_init(&tcp_ses->srv_mutex);
2132 memcpy(tcp_ses->workstation_RFC1001_name,
2133 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2134 memcpy(tcp_ses->server_RFC1001_name,
2135 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2136 tcp_ses->session_estab = false;
2137 tcp_ses->sequence_number = 0;
2138 tcp_ses->lstrp = jiffies;
2139 spin_lock_init(&tcp_ses->req_lock);
2140 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2141 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2142 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2143 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2144 sizeof(tcp_ses->srcaddr));
2145 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2146 sizeof(tcp_ses->dstaddr));
2147 /*
2148 * at this point we are the only ones with the pointer
2149 * to the struct since the kernel thread not created yet
2150 * no need to spinlock this init of tcpStatus or srv_count
2151 */
2152 tcp_ses->tcpStatus = CifsNew;
2153 ++tcp_ses->srv_count;
2154
2155 rc = ip_connect(tcp_ses);
2156 if (rc < 0) {
2157 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2158 goto out_err_crypto_release;
2159 }
2160
2161 /*
2162 * since we're in a cifs function already, we know that
2163 * this will succeed. No need for try_module_get().
2164 */
2165 __module_get(THIS_MODULE);
2166 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2167 tcp_ses, "cifsd");
2168 if (IS_ERR(tcp_ses->tsk)) {
2169 rc = PTR_ERR(tcp_ses->tsk);
2170 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2171 module_put(THIS_MODULE);
2172 goto out_err_crypto_release;
2173 }
2174 tcp_ses->tcpStatus = CifsNeedNegotiate;
2175
2176 /* thread spawned, put it on the list */
2177 spin_lock(&cifs_tcp_ses_lock);
2178 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2179 spin_unlock(&cifs_tcp_ses_lock);
2180
2181 cifs_fscache_get_client_cookie(tcp_ses);
2182
2183 /* queue echo request delayed work */
2184 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2185
2186 return tcp_ses;
2187
2188out_err_crypto_release:
2189 cifs_crypto_shash_release(tcp_ses);
2190
2191 put_net(cifs_net_ns(tcp_ses));
2192
2193out_err:
2194 if (tcp_ses) {
2195 if (!IS_ERR(tcp_ses->hostname))
2196 kfree(tcp_ses->hostname);
2197 if (tcp_ses->ssocket)
2198 sock_release(tcp_ses->ssocket);
2199 kfree(tcp_ses);
2200 }
2201 return ERR_PTR(rc);
2202}
2203
2204static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2205{
2206 if (vol->sectype != Unspecified &&
2207 vol->sectype != ses->sectype)
2208 return 0;
2209
2210 switch (ses->sectype) {
2211 case Kerberos:
2212 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2213 return 0;
2214 break;
2215 default:
2216 /* NULL username means anonymous session */
2217 if (ses->user_name == NULL) {
2218 if (!vol->nullauth)
2219 return 0;
2220 break;
2221 }
2222
2223 /* anything else takes username/password */
2224 if (strncmp(ses->user_name,
2225 vol->username ? vol->username : "",
2226 CIFS_MAX_USERNAME_LEN))
2227 return 0;
2228 if (strlen(vol->username) != 0 &&
2229 ses->password != NULL &&
2230 strncmp(ses->password,
2231 vol->password ? vol->password : "",
2232 CIFS_MAX_PASSWORD_LEN))
2233 return 0;
2234 }
2235 return 1;
2236}
2237
2238static struct cifs_ses *
2239cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2240{
2241 struct cifs_ses *ses;
2242
2243 spin_lock(&cifs_tcp_ses_lock);
2244 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2245 if (ses->status == CifsExiting)
2246 continue;
2247 if (!match_session(ses, vol))
2248 continue;
2249 ++ses->ses_count;
2250 spin_unlock(&cifs_tcp_ses_lock);
2251 return ses;
2252 }
2253 spin_unlock(&cifs_tcp_ses_lock);
2254 return NULL;
2255}
2256
2257static void
2258cifs_put_smb_ses(struct cifs_ses *ses)
2259{
2260 unsigned int rc, xid;
2261 struct TCP_Server_Info *server = ses->server;
2262
2263 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2264
2265 spin_lock(&cifs_tcp_ses_lock);
2266 if (ses->status == CifsExiting) {
2267 spin_unlock(&cifs_tcp_ses_lock);
2268 return;
2269 }
2270 if (--ses->ses_count > 0) {
2271 spin_unlock(&cifs_tcp_ses_lock);
2272 return;
2273 }
2274 if (ses->status == CifsGood)
2275 ses->status = CifsExiting;
2276 spin_unlock(&cifs_tcp_ses_lock);
2277
2278 if (ses->status == CifsExiting && server->ops->logoff) {
2279 xid = get_xid();
2280 rc = server->ops->logoff(xid, ses);
2281 if (rc)
2282 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2283 __func__, rc);
2284 _free_xid(xid);
2285 }
2286
2287 spin_lock(&cifs_tcp_ses_lock);
2288 list_del_init(&ses->smb_ses_list);
2289 spin_unlock(&cifs_tcp_ses_lock);
2290
2291 sesInfoFree(ses);
2292 cifs_put_tcp_session(server);
2293}
2294
2295#ifdef CONFIG_KEYS
2296
2297/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2298#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2299
2300/* Populate username and pw fields from keyring if possible */
2301static int
2302cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2303{
2304 int rc = 0;
2305 char *desc, *delim, *payload;
2306 ssize_t len;
2307 struct key *key;
2308 struct TCP_Server_Info *server = ses->server;
2309 struct sockaddr_in *sa;
2310 struct sockaddr_in6 *sa6;
2311 struct user_key_payload *upayload;
2312
2313 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2314 if (!desc)
2315 return -ENOMEM;
2316
2317 /* try to find an address key first */
2318 switch (server->dstaddr.ss_family) {
2319 case AF_INET:
2320 sa = (struct sockaddr_in *)&server->dstaddr;
2321 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2322 break;
2323 case AF_INET6:
2324 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2325 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2326 break;
2327 default:
2328 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2329 server->dstaddr.ss_family);
2330 rc = -EINVAL;
2331 goto out_err;
2332 }
2333
2334 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2335 key = request_key(&key_type_logon, desc, "");
2336 if (IS_ERR(key)) {
2337 if (!ses->domainName) {
2338 cifs_dbg(FYI, "domainName is NULL\n");
2339 rc = PTR_ERR(key);
2340 goto out_err;
2341 }
2342
2343 /* didn't work, try to find a domain key */
2344 sprintf(desc, "cifs:d:%s", ses->domainName);
2345 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2346 key = request_key(&key_type_logon, desc, "");
2347 if (IS_ERR(key)) {
2348 rc = PTR_ERR(key);
2349 goto out_err;
2350 }
2351 }
2352
2353 down_read(&key->sem);
2354 upayload = key->payload.data;
2355 if (IS_ERR_OR_NULL(upayload)) {
2356 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2357 goto out_key_put;
2358 }
2359
2360 /* find first : in payload */
2361 payload = (char *)upayload->data;
2362 delim = strnchr(payload, upayload->datalen, ':');
2363 cifs_dbg(FYI, "payload=%s\n", payload);
2364 if (!delim) {
2365 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2366 upayload->datalen);
2367 rc = -EINVAL;
2368 goto out_key_put;
2369 }
2370
2371 len = delim - payload;
2372 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2373 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2374 len);
2375 rc = -EINVAL;
2376 goto out_key_put;
2377 }
2378
2379 vol->username = kstrndup(payload, len, GFP_KERNEL);
2380 if (!vol->username) {
2381 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2382 len);
2383 rc = -ENOMEM;
2384 goto out_key_put;
2385 }
2386 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2387
2388 len = key->datalen - (len + 1);
2389 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2390 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2391 rc = -EINVAL;
2392 kfree(vol->username);
2393 vol->username = NULL;
2394 goto out_key_put;
2395 }
2396
2397 ++delim;
2398 vol->password = kstrndup(delim, len, GFP_KERNEL);
2399 if (!vol->password) {
2400 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2401 len);
2402 rc = -ENOMEM;
2403 kfree(vol->username);
2404 vol->username = NULL;
2405 goto out_key_put;
2406 }
2407
2408out_key_put:
2409 up_read(&key->sem);
2410 key_put(key);
2411out_err:
2412 kfree(desc);
2413 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2414 return rc;
2415}
2416#else /* ! CONFIG_KEYS */
2417static inline int
2418cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2419 struct cifs_ses *ses __attribute__((unused)))
2420{
2421 return -ENOSYS;
2422}
2423#endif /* CONFIG_KEYS */
2424
2425static struct cifs_ses *
2426cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2427{
2428 int rc = -ENOMEM;
2429 unsigned int xid;
2430 struct cifs_ses *ses;
2431 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2432 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2433
2434 xid = get_xid();
2435
2436 ses = cifs_find_smb_ses(server, volume_info);
2437 if (ses) {
2438 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2439 ses->status);
2440
2441 mutex_lock(&ses->session_mutex);
2442 rc = cifs_negotiate_protocol(xid, ses);
2443 if (rc) {
2444 mutex_unlock(&ses->session_mutex);
2445 /* problem -- put our ses reference */
2446 cifs_put_smb_ses(ses);
2447 free_xid(xid);
2448 return ERR_PTR(rc);
2449 }
2450 if (ses->need_reconnect) {
2451 cifs_dbg(FYI, "Session needs reconnect\n");
2452 rc = cifs_setup_session(xid, ses,
2453 volume_info->local_nls);
2454 if (rc) {
2455 mutex_unlock(&ses->session_mutex);
2456 /* problem -- put our reference */
2457 cifs_put_smb_ses(ses);
2458 free_xid(xid);
2459 return ERR_PTR(rc);
2460 }
2461 }
2462 mutex_unlock(&ses->session_mutex);
2463
2464 /* existing SMB ses has a server reference already */
2465 cifs_put_tcp_session(server);
2466 free_xid(xid);
2467 return ses;
2468 }
2469
2470 cifs_dbg(FYI, "Existing smb sess not found\n");
2471 ses = sesInfoAlloc();
2472 if (ses == NULL)
2473 goto get_ses_fail;
2474
2475 /* new SMB session uses our server ref */
2476 ses->server = server;
2477 if (server->dstaddr.ss_family == AF_INET6)
2478 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2479 else
2480 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2481
2482 if (volume_info->username) {
2483 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2484 if (!ses->user_name)
2485 goto get_ses_fail;
2486 }
2487
2488 /* volume_info->password freed at unmount */
2489 if (volume_info->password) {
2490 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2491 if (!ses->password)
2492 goto get_ses_fail;
2493 }
2494 if (volume_info->domainname) {
2495 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2496 if (!ses->domainName)
2497 goto get_ses_fail;
2498 }
2499 ses->cred_uid = volume_info->cred_uid;
2500 ses->linux_uid = volume_info->linux_uid;
2501
2502 ses->sectype = volume_info->sectype;
2503 ses->sign = volume_info->sign;
2504
2505 mutex_lock(&ses->session_mutex);
2506 rc = cifs_negotiate_protocol(xid, ses);
2507 if (!rc)
2508 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2509 mutex_unlock(&ses->session_mutex);
2510 if (rc)
2511 goto get_ses_fail;
2512
2513 /* success, put it on the list */
2514 spin_lock(&cifs_tcp_ses_lock);
2515 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2516 spin_unlock(&cifs_tcp_ses_lock);
2517
2518 free_xid(xid);
2519 return ses;
2520
2521get_ses_fail:
2522 sesInfoFree(ses);
2523 free_xid(xid);
2524 return ERR_PTR(rc);
2525}
2526
2527static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2528{
2529 if (tcon->tidStatus == CifsExiting)
2530 return 0;
2531 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2532 return 0;
2533 return 1;
2534}
2535
2536static struct cifs_tcon *
2537cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2538{
2539 struct list_head *tmp;
2540 struct cifs_tcon *tcon;
2541
2542 spin_lock(&cifs_tcp_ses_lock);
2543 list_for_each(tmp, &ses->tcon_list) {
2544 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2545 if (!match_tcon(tcon, unc))
2546 continue;
2547 ++tcon->tc_count;
2548 spin_unlock(&cifs_tcp_ses_lock);
2549 return tcon;
2550 }
2551 spin_unlock(&cifs_tcp_ses_lock);
2552 return NULL;
2553}
2554
2555static void
2556cifs_put_tcon(struct cifs_tcon *tcon)
2557{
2558 unsigned int xid;
2559 struct cifs_ses *ses = tcon->ses;
2560
2561 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2562 spin_lock(&cifs_tcp_ses_lock);
2563 if (--tcon->tc_count > 0) {
2564 spin_unlock(&cifs_tcp_ses_lock);
2565 return;
2566 }
2567
2568 list_del_init(&tcon->tcon_list);
2569 spin_unlock(&cifs_tcp_ses_lock);
2570
2571 xid = get_xid();
2572 if (ses->server->ops->tree_disconnect)
2573 ses->server->ops->tree_disconnect(xid, tcon);
2574 _free_xid(xid);
2575
2576 cifs_fscache_release_super_cookie(tcon);
2577 tconInfoFree(tcon);
2578 cifs_put_smb_ses(ses);
2579}
2580
2581static struct cifs_tcon *
2582cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2583{
2584 int rc, xid;
2585 struct cifs_tcon *tcon;
2586
2587 tcon = cifs_find_tcon(ses, volume_info->UNC);
2588 if (tcon) {
2589 cifs_dbg(FYI, "Found match on UNC path\n");
2590 /* existing tcon already has a reference */
2591 cifs_put_smb_ses(ses);
2592 if (tcon->seal != volume_info->seal)
2593 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2594 return tcon;
2595 }
2596
2597 if (!ses->server->ops->tree_connect) {
2598 rc = -ENOSYS;
2599 goto out_fail;
2600 }
2601
2602 tcon = tconInfoAlloc();
2603 if (tcon == NULL) {
2604 rc = -ENOMEM;
2605 goto out_fail;
2606 }
2607
2608 tcon->ses = ses;
2609 if (volume_info->password) {
2610 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2611 if (!tcon->password) {
2612 rc = -ENOMEM;
2613 goto out_fail;
2614 }
2615 }
2616
2617 /*
2618 * BB Do we need to wrap session_mutex around this TCon call and Unix
2619 * SetFS as we do on SessSetup and reconnect?
2620 */
2621 xid = get_xid();
2622 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2623 volume_info->local_nls);
2624 free_xid(xid);
2625 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2626 if (rc)
2627 goto out_fail;
2628
2629 if (volume_info->nodfs) {
2630 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2631 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2632 }
2633 tcon->seal = volume_info->seal;
2634 /*
2635 * We can have only one retry value for a connection to a share so for
2636 * resources mounted more than once to the same server share the last
2637 * value passed in for the retry flag is used.
2638 */
2639 tcon->retry = volume_info->retry;
2640 tcon->nocase = volume_info->nocase;
2641 tcon->local_lease = volume_info->local_lease;
2642 INIT_LIST_HEAD(&tcon->pending_opens);
2643
2644 spin_lock(&cifs_tcp_ses_lock);
2645 list_add(&tcon->tcon_list, &ses->tcon_list);
2646 spin_unlock(&cifs_tcp_ses_lock);
2647
2648 cifs_fscache_get_super_cookie(tcon);
2649
2650 return tcon;
2651
2652out_fail:
2653 tconInfoFree(tcon);
2654 return ERR_PTR(rc);
2655}
2656
2657void
2658cifs_put_tlink(struct tcon_link *tlink)
2659{
2660 if (!tlink || IS_ERR(tlink))
2661 return;
2662
2663 if (!atomic_dec_and_test(&tlink->tl_count) ||
2664 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2665 tlink->tl_time = jiffies;
2666 return;
2667 }
2668
2669 if (!IS_ERR(tlink_tcon(tlink)))
2670 cifs_put_tcon(tlink_tcon(tlink));
2671 kfree(tlink);
2672 return;
2673}
2674
2675static inline struct tcon_link *
2676cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2677{
2678 return cifs_sb->master_tlink;
2679}
2680
2681static int
2682compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2683{
2684 struct cifs_sb_info *old = CIFS_SB(sb);
2685 struct cifs_sb_info *new = mnt_data->cifs_sb;
2686
2687 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2688 return 0;
2689
2690 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2691 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2692 return 0;
2693
2694 /*
2695 * We want to share sb only if we don't specify an r/wsize or
2696 * specified r/wsize is greater than or equal to existing one.
2697 */
2698 if (new->wsize && new->wsize < old->wsize)
2699 return 0;
2700
2701 if (new->rsize && new->rsize < old->rsize)
2702 return 0;
2703
2704 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2705 return 0;
2706
2707 if (old->mnt_file_mode != new->mnt_file_mode ||
2708 old->mnt_dir_mode != new->mnt_dir_mode)
2709 return 0;
2710
2711 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2712 return 0;
2713
2714 if (old->actimeo != new->actimeo)
2715 return 0;
2716
2717 return 1;
2718}
2719
2720int
2721cifs_match_super(struct super_block *sb, void *data)
2722{
2723 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2724 struct smb_vol *volume_info;
2725 struct cifs_sb_info *cifs_sb;
2726 struct TCP_Server_Info *tcp_srv;
2727 struct cifs_ses *ses;
2728 struct cifs_tcon *tcon;
2729 struct tcon_link *tlink;
2730 int rc = 0;
2731
2732 spin_lock(&cifs_tcp_ses_lock);
2733 cifs_sb = CIFS_SB(sb);
2734 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2735 if (IS_ERR(tlink)) {
2736 spin_unlock(&cifs_tcp_ses_lock);
2737 return rc;
2738 }
2739 tcon = tlink_tcon(tlink);
2740 ses = tcon->ses;
2741 tcp_srv = ses->server;
2742
2743 volume_info = mnt_data->vol;
2744
2745 if (!match_server(tcp_srv, volume_info) ||
2746 !match_session(ses, volume_info) ||
2747 !match_tcon(tcon, volume_info->UNC)) {
2748 rc = 0;
2749 goto out;
2750 }
2751
2752 rc = compare_mount_options(sb, mnt_data);
2753out:
2754 spin_unlock(&cifs_tcp_ses_lock);
2755 cifs_put_tlink(tlink);
2756 return rc;
2757}
2758
2759int
2760get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2761 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2762 struct dfs_info3_param **referrals, int remap)
2763{
2764 char *temp_unc;
2765 int rc = 0;
2766
2767 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2768 return -ENOSYS;
2769
2770 *num_referrals = 0;
2771 *referrals = NULL;
2772
2773 if (ses->ipc_tid == 0) {
2774 temp_unc = kmalloc(2 /* for slashes */ +
2775 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2776 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2777 if (temp_unc == NULL)
2778 return -ENOMEM;
2779 temp_unc[0] = '\\';
2780 temp_unc[1] = '\\';
2781 strcpy(temp_unc + 2, ses->serverName);
2782 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2783 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2784 nls_codepage);
2785 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2786 kfree(temp_unc);
2787 }
2788 if (rc == 0)
2789 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2790 referrals, num_referrals,
2791 nls_codepage, remap);
2792 /*
2793 * BB - map targetUNCs to dfs_info3 structures, here or in
2794 * ses->server->ops->get_dfs_refer.
2795 */
2796
2797 return rc;
2798}
2799
2800#ifdef CONFIG_DEBUG_LOCK_ALLOC
2801static struct lock_class_key cifs_key[2];
2802static struct lock_class_key cifs_slock_key[2];
2803
2804static inline void
2805cifs_reclassify_socket4(struct socket *sock)
2806{
2807 struct sock *sk = sock->sk;
2808 BUG_ON(sock_owned_by_user(sk));
2809 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2810 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2811}
2812
2813static inline void
2814cifs_reclassify_socket6(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_INET6-CIFS",
2819 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2820}
2821#else
2822static inline void
2823cifs_reclassify_socket4(struct socket *sock)
2824{
2825}
2826
2827static inline void
2828cifs_reclassify_socket6(struct socket *sock)
2829{
2830}
2831#endif
2832
2833/* See RFC1001 section 14 on representation of Netbios names */
2834static void rfc1002mangle(char *target, char *source, unsigned int length)
2835{
2836 unsigned int i, j;
2837
2838 for (i = 0, j = 0; i < (length); i++) {
2839 /* mask a nibble at a time and encode */
2840 target[j] = 'A' + (0x0F & (source[i] >> 4));
2841 target[j+1] = 'A' + (0x0F & source[i]);
2842 j += 2;
2843 }
2844
2845}
2846
2847static int
2848bind_socket(struct TCP_Server_Info *server)
2849{
2850 int rc = 0;
2851 if (server->srcaddr.ss_family != AF_UNSPEC) {
2852 /* Bind to the specified local IP address */
2853 struct socket *socket = server->ssocket;
2854 rc = socket->ops->bind(socket,
2855 (struct sockaddr *) &server->srcaddr,
2856 sizeof(server->srcaddr));
2857 if (rc < 0) {
2858 struct sockaddr_in *saddr4;
2859 struct sockaddr_in6 *saddr6;
2860 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2861 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2862 if (saddr6->sin6_family == AF_INET6)
2863 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2864 &saddr6->sin6_addr, rc);
2865 else
2866 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2867 &saddr4->sin_addr.s_addr, rc);
2868 }
2869 }
2870 return rc;
2871}
2872
2873static int
2874ip_rfc1001_connect(struct TCP_Server_Info *server)
2875{
2876 int rc = 0;
2877 /*
2878 * some servers require RFC1001 sessinit before sending
2879 * negprot - BB check reconnection in case where second
2880 * sessinit is sent but no second negprot
2881 */
2882 struct rfc1002_session_packet *ses_init_buf;
2883 struct smb_hdr *smb_buf;
2884 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2885 GFP_KERNEL);
2886 if (ses_init_buf) {
2887 ses_init_buf->trailer.session_req.called_len = 32;
2888
2889 if (server->server_RFC1001_name &&
2890 server->server_RFC1001_name[0] != 0)
2891 rfc1002mangle(ses_init_buf->trailer.
2892 session_req.called_name,
2893 server->server_RFC1001_name,
2894 RFC1001_NAME_LEN_WITH_NULL);
2895 else
2896 rfc1002mangle(ses_init_buf->trailer.
2897 session_req.called_name,
2898 DEFAULT_CIFS_CALLED_NAME,
2899 RFC1001_NAME_LEN_WITH_NULL);
2900
2901 ses_init_buf->trailer.session_req.calling_len = 32;
2902
2903 /*
2904 * calling name ends in null (byte 16) from old smb
2905 * convention.
2906 */
2907 if (server->workstation_RFC1001_name &&
2908 server->workstation_RFC1001_name[0] != 0)
2909 rfc1002mangle(ses_init_buf->trailer.
2910 session_req.calling_name,
2911 server->workstation_RFC1001_name,
2912 RFC1001_NAME_LEN_WITH_NULL);
2913 else
2914 rfc1002mangle(ses_init_buf->trailer.
2915 session_req.calling_name,
2916 "LINUX_CIFS_CLNT",
2917 RFC1001_NAME_LEN_WITH_NULL);
2918
2919 ses_init_buf->trailer.session_req.scope1 = 0;
2920 ses_init_buf->trailer.session_req.scope2 = 0;
2921 smb_buf = (struct smb_hdr *)ses_init_buf;
2922
2923 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2924 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2925 rc = smb_send(server, smb_buf, 0x44);
2926 kfree(ses_init_buf);
2927 /*
2928 * RFC1001 layer in at least one server
2929 * requires very short break before negprot
2930 * presumably because not expecting negprot
2931 * to follow so fast. This is a simple
2932 * solution that works without
2933 * complicating the code and causes no
2934 * significant slowing down on mount
2935 * for everyone else
2936 */
2937 usleep_range(1000, 2000);
2938 }
2939 /*
2940 * else the negprot may still work without this
2941 * even though malloc failed
2942 */
2943
2944 return rc;
2945}
2946
2947static int
2948generic_ip_connect(struct TCP_Server_Info *server)
2949{
2950 int rc = 0;
2951 __be16 sport;
2952 int slen, sfamily;
2953 struct socket *socket = server->ssocket;
2954 struct sockaddr *saddr;
2955
2956 saddr = (struct sockaddr *) &server->dstaddr;
2957
2958 if (server->dstaddr.ss_family == AF_INET6) {
2959 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2960 slen = sizeof(struct sockaddr_in6);
2961 sfamily = AF_INET6;
2962 } else {
2963 sport = ((struct sockaddr_in *) saddr)->sin_port;
2964 slen = sizeof(struct sockaddr_in);
2965 sfamily = AF_INET;
2966 }
2967
2968 if (socket == NULL) {
2969 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2970 IPPROTO_TCP, &socket, 1);
2971 if (rc < 0) {
2972 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2973 server->ssocket = NULL;
2974 return rc;
2975 }
2976
2977 /* BB other socket options to set KEEPALIVE, NODELAY? */
2978 cifs_dbg(FYI, "Socket created\n");
2979 server->ssocket = socket;
2980 socket->sk->sk_allocation = GFP_NOFS;
2981 if (sfamily == AF_INET6)
2982 cifs_reclassify_socket6(socket);
2983 else
2984 cifs_reclassify_socket4(socket);
2985 }
2986
2987 rc = bind_socket(server);
2988 if (rc < 0)
2989 return rc;
2990
2991 /*
2992 * Eventually check for other socket options to change from
2993 * the default. sock_setsockopt not used because it expects
2994 * user space buffer
2995 */
2996 socket->sk->sk_rcvtimeo = 7 * HZ;
2997 socket->sk->sk_sndtimeo = 5 * HZ;
2998
2999 /* make the bufsizes depend on wsize/rsize and max requests */
3000 if (server->noautotune) {
3001 if (socket->sk->sk_sndbuf < (200 * 1024))
3002 socket->sk->sk_sndbuf = 200 * 1024;
3003 if (socket->sk->sk_rcvbuf < (140 * 1024))
3004 socket->sk->sk_rcvbuf = 140 * 1024;
3005 }
3006
3007 if (server->tcp_nodelay) {
3008 int val = 1;
3009 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3010 (char *)&val, sizeof(val));
3011 if (rc)
3012 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3013 rc);
3014 }
3015
3016 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3017 socket->sk->sk_sndbuf,
3018 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3019
3020 rc = socket->ops->connect(socket, saddr, slen, 0);
3021 if (rc < 0) {
3022 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3023 sock_release(socket);
3024 server->ssocket = NULL;
3025 return rc;
3026 }
3027
3028 if (sport == htons(RFC1001_PORT))
3029 rc = ip_rfc1001_connect(server);
3030
3031 return rc;
3032}
3033
3034static int
3035ip_connect(struct TCP_Server_Info *server)
3036{
3037 __be16 *sport;
3038 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3039 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3040
3041 if (server->dstaddr.ss_family == AF_INET6)
3042 sport = &addr6->sin6_port;
3043 else
3044 sport = &addr->sin_port;
3045
3046 if (*sport == 0) {
3047 int rc;
3048
3049 /* try with 445 port at first */
3050 *sport = htons(CIFS_PORT);
3051
3052 rc = generic_ip_connect(server);
3053 if (rc >= 0)
3054 return rc;
3055
3056 /* if it failed, try with 139 port */
3057 *sport = htons(RFC1001_PORT);
3058 }
3059
3060 return generic_ip_connect(server);
3061}
3062
3063void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3064 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3065{
3066 /* if we are reconnecting then should we check to see if
3067 * any requested capabilities changed locally e.g. via
3068 * remount but we can not do much about it here
3069 * if they have (even if we could detect it by the following)
3070 * Perhaps we could add a backpointer to array of sb from tcon
3071 * or if we change to make all sb to same share the same
3072 * sb as NFS - then we only have one backpointer to sb.
3073 * What if we wanted to mount the server share twice once with
3074 * and once without posixacls or posix paths? */
3075 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3076
3077 if (vol_info && vol_info->no_linux_ext) {
3078 tcon->fsUnixInfo.Capability = 0;
3079 tcon->unix_ext = 0; /* Unix Extensions disabled */
3080 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3081 return;
3082 } else if (vol_info)
3083 tcon->unix_ext = 1; /* Unix Extensions supported */
3084
3085 if (tcon->unix_ext == 0) {
3086 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3087 return;
3088 }
3089
3090 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3091 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3092 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3093 /* check for reconnect case in which we do not
3094 want to change the mount behavior if we can avoid it */
3095 if (vol_info == NULL) {
3096 /* turn off POSIX ACL and PATHNAMES if not set
3097 originally at mount time */
3098 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3099 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3100 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3101 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3102 cifs_dbg(VFS, "POSIXPATH support change\n");
3103 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3104 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3105 cifs_dbg(VFS, "possible reconnect error\n");
3106 cifs_dbg(VFS, "server disabled POSIX path support\n");
3107 }
3108 }
3109
3110 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3111 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3112
3113 cap &= CIFS_UNIX_CAP_MASK;
3114 if (vol_info && vol_info->no_psx_acl)
3115 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3116 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3117 cifs_dbg(FYI, "negotiated posix acl support\n");
3118 if (cifs_sb)
3119 cifs_sb->mnt_cifs_flags |=
3120 CIFS_MOUNT_POSIXACL;
3121 }
3122
3123 if (vol_info && vol_info->posix_paths == 0)
3124 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3125 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3126 cifs_dbg(FYI, "negotiate posix pathnames\n");
3127 if (cifs_sb)
3128 cifs_sb->mnt_cifs_flags |=
3129 CIFS_MOUNT_POSIX_PATHS;
3130 }
3131
3132 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3133#ifdef CONFIG_CIFS_DEBUG2
3134 if (cap & CIFS_UNIX_FCNTL_CAP)
3135 cifs_dbg(FYI, "FCNTL cap\n");
3136 if (cap & CIFS_UNIX_EXTATTR_CAP)
3137 cifs_dbg(FYI, "EXTATTR cap\n");
3138 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3139 cifs_dbg(FYI, "POSIX path cap\n");
3140 if (cap & CIFS_UNIX_XATTR_CAP)
3141 cifs_dbg(FYI, "XATTR cap\n");
3142 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3143 cifs_dbg(FYI, "POSIX ACL cap\n");
3144 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3145 cifs_dbg(FYI, "very large read cap\n");
3146 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3147 cifs_dbg(FYI, "very large write cap\n");
3148 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3149 cifs_dbg(FYI, "transport encryption cap\n");
3150 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3151 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3152#endif /* CIFS_DEBUG2 */
3153 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3154 if (vol_info == NULL) {
3155 cifs_dbg(FYI, "resetting capabilities failed\n");
3156 } else
3157 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");
3158
3159 }
3160 }
3161}
3162
3163void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3164 struct cifs_sb_info *cifs_sb)
3165{
3166 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3167
3168 spin_lock_init(&cifs_sb->tlink_tree_lock);
3169 cifs_sb->tlink_tree = RB_ROOT;
3170
3171 /*
3172 * Temporarily set r/wsize for matching superblock. If we end up using
3173 * new sb then client will later negotiate it downward if needed.
3174 */
3175 cifs_sb->rsize = pvolume_info->rsize;
3176 cifs_sb->wsize = pvolume_info->wsize;
3177
3178 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3179 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3180 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3181 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3182 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3183 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3184
3185 cifs_sb->actimeo = pvolume_info->actimeo;
3186 cifs_sb->local_nls = pvolume_info->local_nls;
3187
3188 if (pvolume_info->noperm)
3189 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3190 if (pvolume_info->setuids)
3191 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3192 if (pvolume_info->server_ino)
3193 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3194 if (pvolume_info->remap)
3195 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3196 if (pvolume_info->no_xattr)
3197 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3198 if (pvolume_info->sfu_emul)
3199 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3200 if (pvolume_info->nobrl)
3201 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3202 if (pvolume_info->nostrictsync)
3203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3204 if (pvolume_info->mand_lock)
3205 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3206 if (pvolume_info->rwpidforward)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3208 if (pvolume_info->cifs_acl)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3210 if (pvolume_info->backupuid_specified) {
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3212 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3213 }
3214 if (pvolume_info->backupgid_specified) {
3215 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3216 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3217 }
3218 if (pvolume_info->override_uid)
3219 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3220 if (pvolume_info->override_gid)
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3222 if (pvolume_info->dynperm)
3223 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3224 if (pvolume_info->fsc)
3225 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3226 if (pvolume_info->multiuser)
3227 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3228 CIFS_MOUNT_NO_PERM);
3229 if (pvolume_info->strict_io)
3230 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3231 if (pvolume_info->direct_io) {
3232 cifs_dbg(FYI, "mounting share using direct i/o\n");
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3234 }
3235 if (pvolume_info->mfsymlinks) {
3236 if (pvolume_info->sfu_emul) {
3237 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3238 } else {
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3240 }
3241 }
3242
3243 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3244 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3245}
3246
3247static void
3248cleanup_volume_info_contents(struct smb_vol *volume_info)
3249{
3250 kfree(volume_info->username);
3251 kzfree(volume_info->password);
3252 kfree(volume_info->UNC);
3253 kfree(volume_info->domainname);
3254 kfree(volume_info->iocharset);
3255 kfree(volume_info->prepath);
3256}
3257
3258void
3259cifs_cleanup_volume_info(struct smb_vol *volume_info)
3260{
3261 if (!volume_info)
3262 return;
3263 cleanup_volume_info_contents(volume_info);
3264 kfree(volume_info);
3265}
3266
3267
3268#ifdef CONFIG_CIFS_DFS_UPCALL
3269/*
3270 * cifs_build_path_to_root returns full path to root when we do not have an
3271 * exiting connection (tcon)
3272 */
3273static char *
3274build_unc_path_to_root(const struct smb_vol *vol,
3275 const struct cifs_sb_info *cifs_sb)
3276{
3277 char *full_path, *pos;
3278 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3279 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3280
3281 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3282 if (full_path == NULL)
3283 return ERR_PTR(-ENOMEM);
3284
3285 strncpy(full_path, vol->UNC, unc_len);
3286 pos = full_path + unc_len;
3287
3288 if (pplen) {
3289 *pos = CIFS_DIR_SEP(cifs_sb);
3290 strncpy(pos + 1, vol->prepath, pplen);
3291 pos += pplen;
3292 }
3293
3294 *pos = '\0'; /* add trailing null */
3295 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3296 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3297 return full_path;
3298}
3299
3300/*
3301 * Perform a dfs referral query for a share and (optionally) prefix
3302 *
3303 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3304 * to a string containing updated options for the submount. Otherwise it
3305 * will be left untouched.
3306 *
3307 * Returns the rc from get_dfs_path to the caller, which can be used to
3308 * determine whether there were referrals.
3309 */
3310static int
3311expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3312 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3313 int check_prefix)
3314{
3315 int rc;
3316 unsigned int num_referrals = 0;
3317 struct dfs_info3_param *referrals = NULL;
3318 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3319
3320 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3321 if (IS_ERR(full_path))
3322 return PTR_ERR(full_path);
3323
3324 /* For DFS paths, skip the first '\' of the UNC */
3325 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3326
3327 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3328 &num_referrals, &referrals,
3329 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3330
3331 if (!rc && num_referrals > 0) {
3332 char *fake_devname = NULL;
3333
3334 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3335 full_path + 1, referrals,
3336 &fake_devname);
3337
3338 free_dfs_info_array(referrals, num_referrals);
3339
3340 if (IS_ERR(mdata)) {
3341 rc = PTR_ERR(mdata);
3342 mdata = NULL;
3343 } else {
3344 cleanup_volume_info_contents(volume_info);
3345 rc = cifs_setup_volume_info(volume_info, mdata,
3346 fake_devname);
3347 }
3348 kfree(fake_devname);
3349 kfree(cifs_sb->mountdata);
3350 cifs_sb->mountdata = mdata;
3351 }
3352 kfree(full_path);
3353 return rc;
3354}
3355#endif
3356
3357static int
3358cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3359 const char *devname)
3360{
3361 int rc = 0;
3362
3363 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3364 return -EINVAL;
3365
3366 if (volume_info->nullauth) {
3367 cifs_dbg(FYI, "Anonymous login\n");
3368 kfree(volume_info->username);
3369 volume_info->username = NULL;
3370 } else if (volume_info->username) {
3371 /* BB fixme parse for domain name here */
3372 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3373 } else {
3374 cifs_dbg(VFS, "No username specified\n");
3375 /* In userspace mount helper we can get user name from alternate
3376 locations such as env variables and files on disk */
3377 return -EINVAL;
3378 }
3379
3380 /* this is needed for ASCII cp to Unicode converts */
3381 if (volume_info->iocharset == NULL) {
3382 /* load_nls_default cannot return null */
3383 volume_info->local_nls = load_nls_default();
3384 } else {
3385 volume_info->local_nls = load_nls(volume_info->iocharset);
3386 if (volume_info->local_nls == NULL) {
3387 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3388 volume_info->iocharset);
3389 return -ELIBACC;
3390 }
3391 }
3392
3393 return rc;
3394}
3395
3396struct smb_vol *
3397cifs_get_volume_info(char *mount_data, const char *devname)
3398{
3399 int rc;
3400 struct smb_vol *volume_info;
3401
3402 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3403 if (!volume_info)
3404 return ERR_PTR(-ENOMEM);
3405
3406 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3407 if (rc) {
3408 cifs_cleanup_volume_info(volume_info);
3409 volume_info = ERR_PTR(rc);
3410 }
3411
3412 return volume_info;
3413}
3414
3415int
3416cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3417{
3418 int rc;
3419 unsigned int xid;
3420 struct cifs_ses *ses;
3421 struct cifs_tcon *tcon;
3422 struct TCP_Server_Info *server;
3423 char *full_path;
3424 struct tcon_link *tlink;
3425#ifdef CONFIG_CIFS_DFS_UPCALL
3426 int referral_walks_count = 0;
3427#endif
3428
3429 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3430 if (rc)
3431 return rc;
3432
3433#ifdef CONFIG_CIFS_DFS_UPCALL
3434try_mount_again:
3435 /* cleanup activities if we're chasing a referral */
3436 if (referral_walks_count) {
3437 if (tcon)
3438 cifs_put_tcon(tcon);
3439 else if (ses)
3440 cifs_put_smb_ses(ses);
3441
3442 free_xid(xid);
3443 }
3444#endif
3445 rc = 0;
3446 tcon = NULL;
3447 ses = NULL;
3448 server = NULL;
3449 full_path = NULL;
3450 tlink = NULL;
3451
3452 xid = get_xid();
3453
3454 /* get a reference to a tcp session */
3455 server = cifs_get_tcp_session(volume_info);
3456 if (IS_ERR(server)) {
3457 rc = PTR_ERR(server);
3458 bdi_destroy(&cifs_sb->bdi);
3459 goto out;
3460 }
3461
3462 /* get a reference to a SMB session */
3463 ses = cifs_get_smb_ses(server, volume_info);
3464 if (IS_ERR(ses)) {
3465 rc = PTR_ERR(ses);
3466 ses = NULL;
3467 goto mount_fail_check;
3468 }
3469
3470 /* search for existing tcon to this server share */
3471 tcon = cifs_get_tcon(ses, volume_info);
3472 if (IS_ERR(tcon)) {
3473 rc = PTR_ERR(tcon);
3474 tcon = NULL;
3475 goto remote_path_check;
3476 }
3477
3478 /* tell server which Unix caps we support */
3479 if (cap_unix(tcon->ses)) {
3480 /* reset of caps checks mount to see if unix extensions
3481 disabled for just this mount */
3482 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3483 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3484 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3485 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3486 rc = -EACCES;
3487 goto mount_fail_check;
3488 }
3489 } else
3490 tcon->unix_ext = 0; /* server does not support them */
3491
3492 /* do not care if a following call succeed - informational */
3493 if (!tcon->ipc && server->ops->qfs_tcon)
3494 server->ops->qfs_tcon(xid, tcon);
3495
3496 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3497 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3498
3499 /* tune readahead according to rsize */
3500 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3501
3502remote_path_check:
3503#ifdef CONFIG_CIFS_DFS_UPCALL
3504 /*
3505 * Perform an unconditional check for whether there are DFS
3506 * referrals for this path without prefix, to provide support
3507 * for DFS referrals from w2k8 servers which don't seem to respond
3508 * with PATH_NOT_COVERED to requests that include the prefix.
3509 * Chase the referral if found, otherwise continue normally.
3510 */
3511 if (referral_walks_count == 0) {
3512 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3513 false);
3514 if (!refrc) {
3515 referral_walks_count++;
3516 goto try_mount_again;
3517 }
3518 }
3519#endif
3520
3521 /* check if a whole path is not remote */
3522 if (!rc && tcon) {
3523 if (!server->ops->is_path_accessible) {
3524 rc = -ENOSYS;
3525 goto mount_fail_check;
3526 }
3527 /*
3528 * cifs_build_path_to_root works only when we have a valid tcon
3529 */
3530 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3531 if (full_path == NULL) {
3532 rc = -ENOMEM;
3533 goto mount_fail_check;
3534 }
3535 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3536 full_path);
3537 if (rc != 0 && rc != -EREMOTE) {
3538 kfree(full_path);
3539 goto mount_fail_check;
3540 }
3541 kfree(full_path);
3542 }
3543
3544 /* get referral if needed */
3545 if (rc == -EREMOTE) {
3546#ifdef CONFIG_CIFS_DFS_UPCALL
3547 if (referral_walks_count > MAX_NESTED_LINKS) {
3548 /*
3549 * BB: when we implement proper loop detection,
3550 * we will remove this check. But now we need it
3551 * to prevent an indefinite loop if 'DFS tree' is
3552 * misconfigured (i.e. has loops).
3553 */
3554 rc = -ELOOP;
3555 goto mount_fail_check;
3556 }
3557
3558 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3559
3560 if (!rc) {
3561 referral_walks_count++;
3562 goto try_mount_again;
3563 }
3564 goto mount_fail_check;
3565#else /* No DFS support, return error on mount */
3566 rc = -EOPNOTSUPP;
3567#endif
3568 }
3569
3570 if (rc)
3571 goto mount_fail_check;
3572
3573 /* now, hang the tcon off of the superblock */
3574 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3575 if (tlink == NULL) {
3576 rc = -ENOMEM;
3577 goto mount_fail_check;
3578 }
3579
3580 tlink->tl_uid = ses->linux_uid;
3581 tlink->tl_tcon = tcon;
3582 tlink->tl_time = jiffies;
3583 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3584 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3585
3586 cifs_sb->master_tlink = tlink;
3587 spin_lock(&cifs_sb->tlink_tree_lock);
3588 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3589 spin_unlock(&cifs_sb->tlink_tree_lock);
3590
3591 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3592 TLINK_IDLE_EXPIRE);
3593
3594mount_fail_check:
3595 /* on error free sesinfo and tcon struct if needed */
3596 if (rc) {
3597 /* If find_unc succeeded then rc == 0 so we can not end */
3598 /* up accidentally freeing someone elses tcon struct */
3599 if (tcon)
3600 cifs_put_tcon(tcon);
3601 else if (ses)
3602 cifs_put_smb_ses(ses);
3603 else
3604 cifs_put_tcp_session(server);
3605 bdi_destroy(&cifs_sb->bdi);
3606 }
3607
3608out:
3609 free_xid(xid);
3610 return rc;
3611}
3612
3613/*
3614 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3615 * pointer may be NULL.
3616 */
3617int
3618CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3619 const char *tree, struct cifs_tcon *tcon,
3620 const struct nls_table *nls_codepage)
3621{
3622 struct smb_hdr *smb_buffer;
3623 struct smb_hdr *smb_buffer_response;
3624 TCONX_REQ *pSMB;
3625 TCONX_RSP *pSMBr;
3626 unsigned char *bcc_ptr;
3627 int rc = 0;
3628 int length;
3629 __u16 bytes_left, count;
3630
3631 if (ses == NULL)
3632 return -EIO;
3633
3634 smb_buffer = cifs_buf_get();
3635 if (smb_buffer == NULL)
3636 return -ENOMEM;
3637
3638 smb_buffer_response = smb_buffer;
3639
3640 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3641 NULL /*no tid */ , 4 /*wct */ );
3642
3643 smb_buffer->Mid = get_next_mid(ses->server);
3644 smb_buffer->Uid = ses->Suid;
3645 pSMB = (TCONX_REQ *) smb_buffer;
3646 pSMBr = (TCONX_RSP *) smb_buffer_response;
3647
3648 pSMB->AndXCommand = 0xFF;
3649 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3650 bcc_ptr = &pSMB->Password[0];
3651 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3652 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3653 *bcc_ptr = 0; /* password is null byte */
3654 bcc_ptr++; /* skip password */
3655 /* already aligned so no need to do it below */
3656 } else {
3657 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3658 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3659 specified as required (when that support is added to
3660 the vfs in the future) as only NTLM or the much
3661 weaker LANMAN (which we do not send by default) is accepted
3662 by Samba (not sure whether other servers allow
3663 NTLMv2 password here) */
3664#ifdef CONFIG_CIFS_WEAK_PW_HASH
3665 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3666 (ses->sectype == LANMAN))
3667 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3668 ses->server->sec_mode &
3669 SECMODE_PW_ENCRYPT ? true : false,
3670 bcc_ptr);
3671 else
3672#endif /* CIFS_WEAK_PW_HASH */
3673 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3674 bcc_ptr, nls_codepage);
3675
3676 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3677 if (ses->capabilities & CAP_UNICODE) {
3678 /* must align unicode strings */
3679 *bcc_ptr = 0; /* null byte password */
3680 bcc_ptr++;
3681 }
3682 }
3683
3684 if (ses->server->sign)
3685 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3686
3687 if (ses->capabilities & CAP_STATUS32) {
3688 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3689 }
3690 if (ses->capabilities & CAP_DFS) {
3691 smb_buffer->Flags2 |= SMBFLG2_DFS;
3692 }
3693 if (ses->capabilities & CAP_UNICODE) {
3694 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3695 length =
3696 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3697 6 /* max utf8 char length in bytes */ *
3698 (/* server len*/ + 256 /* share len */), nls_codepage);
3699 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3700 bcc_ptr += 2; /* skip trailing null */
3701 } else { /* ASCII */
3702 strcpy(bcc_ptr, tree);
3703 bcc_ptr += strlen(tree) + 1;
3704 }
3705 strcpy(bcc_ptr, "?????");
3706 bcc_ptr += strlen("?????");
3707 bcc_ptr += 1;
3708 count = bcc_ptr - &pSMB->Password[0];
3709 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3710 pSMB->hdr.smb_buf_length) + count);
3711 pSMB->ByteCount = cpu_to_le16(count);
3712
3713 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3714 0);
3715
3716 /* above now done in SendReceive */
3717 if ((rc == 0) && (tcon != NULL)) {
3718 bool is_unicode;
3719
3720 tcon->tidStatus = CifsGood;
3721 tcon->need_reconnect = false;
3722 tcon->tid = smb_buffer_response->Tid;
3723 bcc_ptr = pByteArea(smb_buffer_response);
3724 bytes_left = get_bcc(smb_buffer_response);
3725 length = strnlen(bcc_ptr, bytes_left - 2);
3726 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3727 is_unicode = true;
3728 else
3729 is_unicode = false;
3730
3731
3732 /* skip service field (NB: this field is always ASCII) */
3733 if (length == 3) {
3734 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3735 (bcc_ptr[2] == 'C')) {
3736 cifs_dbg(FYI, "IPC connection\n");
3737 tcon->ipc = 1;
3738 }
3739 } else if (length == 2) {
3740 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3741 /* the most common case */
3742 cifs_dbg(FYI, "disk share connection\n");
3743 }
3744 }
3745 bcc_ptr += length + 1;
3746 bytes_left -= (length + 1);
3747 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3748
3749 /* mostly informational -- no need to fail on error here */
3750 kfree(tcon->nativeFileSystem);
3751 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3752 bytes_left, is_unicode,
3753 nls_codepage);
3754
3755 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3756
3757 if ((smb_buffer_response->WordCount == 3) ||
3758 (smb_buffer_response->WordCount == 7))
3759 /* field is in same location */
3760 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3761 else
3762 tcon->Flags = 0;
3763 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3764 } else if ((rc == 0) && tcon == NULL) {
3765 /* all we need to save for IPC$ connection */
3766 ses->ipc_tid = smb_buffer_response->Tid;
3767 }
3768
3769 cifs_buf_release(smb_buffer);
3770 return rc;
3771}
3772
3773static void delayed_free(struct rcu_head *p)
3774{
3775 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3776 unload_nls(sbi->local_nls);
3777 kfree(sbi);
3778}
3779
3780void
3781cifs_umount(struct cifs_sb_info *cifs_sb)
3782{
3783 struct rb_root *root = &cifs_sb->tlink_tree;
3784 struct rb_node *node;
3785 struct tcon_link *tlink;
3786
3787 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3788
3789 spin_lock(&cifs_sb->tlink_tree_lock);
3790 while ((node = rb_first(root))) {
3791 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3792 cifs_get_tlink(tlink);
3793 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3794 rb_erase(node, root);
3795
3796 spin_unlock(&cifs_sb->tlink_tree_lock);
3797 cifs_put_tlink(tlink);
3798 spin_lock(&cifs_sb->tlink_tree_lock);
3799 }
3800 spin_unlock(&cifs_sb->tlink_tree_lock);
3801
3802 bdi_destroy(&cifs_sb->bdi);
3803 kfree(cifs_sb->mountdata);
3804 call_rcu(&cifs_sb->rcu, delayed_free);
3805}
3806
3807int
3808cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3809{
3810 int rc = 0;
3811 struct TCP_Server_Info *server = ses->server;
3812
3813 if (!server->ops->need_neg || !server->ops->negotiate)
3814 return -ENOSYS;
3815
3816 /* only send once per connect */
3817 if (!server->ops->need_neg(server))
3818 return 0;
3819
3820 set_credits(server, 1);
3821
3822 rc = server->ops->negotiate(xid, ses);
3823 if (rc == 0) {
3824 spin_lock(&GlobalMid_Lock);
3825 if (server->tcpStatus == CifsNeedNegotiate)
3826 server->tcpStatus = CifsGood;
3827 else
3828 rc = -EHOSTDOWN;
3829 spin_unlock(&GlobalMid_Lock);
3830 }
3831
3832 return rc;
3833}
3834
3835int
3836cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3837 struct nls_table *nls_info)
3838{
3839 int rc = -ENOSYS;
3840 struct TCP_Server_Info *server = ses->server;
3841
3842 ses->capabilities = server->capabilities;
3843 if (linuxExtEnabled == 0)
3844 ses->capabilities &= (~server->vals->cap_unix);
3845
3846 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3847 server->sec_mode, server->capabilities, server->timeAdj);
3848
3849 if (server->ops->sess_setup)
3850 rc = server->ops->sess_setup(xid, ses, nls_info);
3851
3852 if (rc)
3853 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3854
3855 return rc;
3856}
3857
3858static int
3859cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3860{
3861 vol->sectype = ses->sectype;
3862
3863 /* krb5 is special, since we don't need username or pw */
3864 if (vol->sectype == Kerberos)
3865 return 0;
3866
3867 return cifs_set_cifscreds(vol, ses);
3868}
3869
3870static struct cifs_tcon *
3871cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3872{
3873 int rc;
3874 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3875 struct cifs_ses *ses;
3876 struct cifs_tcon *tcon = NULL;
3877 struct smb_vol *vol_info;
3878
3879 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3880 if (vol_info == NULL)
3881 return ERR_PTR(-ENOMEM);
3882
3883 vol_info->local_nls = cifs_sb->local_nls;
3884 vol_info->linux_uid = fsuid;
3885 vol_info->cred_uid = fsuid;
3886 vol_info->UNC = master_tcon->treeName;
3887 vol_info->retry = master_tcon->retry;
3888 vol_info->nocase = master_tcon->nocase;
3889 vol_info->local_lease = master_tcon->local_lease;
3890 vol_info->no_linux_ext = !master_tcon->unix_ext;
3891 vol_info->sectype = master_tcon->ses->sectype;
3892 vol_info->sign = master_tcon->ses->sign;
3893
3894 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3895 if (rc) {
3896 tcon = ERR_PTR(rc);
3897 goto out;
3898 }
3899
3900 /* get a reference for the same TCP session */
3901 spin_lock(&cifs_tcp_ses_lock);
3902 ++master_tcon->ses->server->srv_count;
3903 spin_unlock(&cifs_tcp_ses_lock);
3904
3905 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3906 if (IS_ERR(ses)) {
3907 tcon = (struct cifs_tcon *)ses;
3908 cifs_put_tcp_session(master_tcon->ses->server);
3909 goto out;
3910 }
3911
3912 tcon = cifs_get_tcon(ses, vol_info);
3913 if (IS_ERR(tcon)) {
3914 cifs_put_smb_ses(ses);
3915 goto out;
3916 }
3917
3918 if (cap_unix(ses))
3919 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3920out:
3921 kfree(vol_info->username);
3922 kfree(vol_info->password);
3923 kfree(vol_info);
3924
3925 return tcon;
3926}
3927
3928struct cifs_tcon *
3929cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3930{
3931 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3932}
3933
3934static int
3935cifs_sb_tcon_pending_wait(void *unused)
3936{
3937 schedule();
3938 return signal_pending(current) ? -ERESTARTSYS : 0;
3939}
3940
3941/* find and return a tlink with given uid */
3942static struct tcon_link *
3943tlink_rb_search(struct rb_root *root, kuid_t uid)
3944{
3945 struct rb_node *node = root->rb_node;
3946 struct tcon_link *tlink;
3947
3948 while (node) {
3949 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3950
3951 if (uid_gt(tlink->tl_uid, uid))
3952 node = node->rb_left;
3953 else if (uid_lt(tlink->tl_uid, uid))
3954 node = node->rb_right;
3955 else
3956 return tlink;
3957 }
3958 return NULL;
3959}
3960
3961/* insert a tcon_link into the tree */
3962static void
3963tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3964{
3965 struct rb_node **new = &(root->rb_node), *parent = NULL;
3966 struct tcon_link *tlink;
3967
3968 while (*new) {
3969 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3970 parent = *new;
3971
3972 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3973 new = &((*new)->rb_left);
3974 else
3975 new = &((*new)->rb_right);
3976 }
3977
3978 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3979 rb_insert_color(&new_tlink->tl_rbnode, root);
3980}
3981
3982/*
3983 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3984 * current task.
3985 *
3986 * If the superblock doesn't refer to a multiuser mount, then just return
3987 * the master tcon for the mount.
3988 *
3989 * First, search the rbtree for an existing tcon for this fsuid. If one
3990 * exists, then check to see if it's pending construction. If it is then wait
3991 * for construction to complete. Once it's no longer pending, check to see if
3992 * it failed and either return an error or retry construction, depending on
3993 * the timeout.
3994 *
3995 * If one doesn't exist then insert a new tcon_link struct into the tree and
3996 * try to construct a new one.
3997 */
3998struct tcon_link *
3999cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4000{
4001 int ret;
4002 kuid_t fsuid = current_fsuid();
4003 struct tcon_link *tlink, *newtlink;
4004
4005 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4006 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4007
4008 spin_lock(&cifs_sb->tlink_tree_lock);
4009 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4010 if (tlink)
4011 cifs_get_tlink(tlink);
4012 spin_unlock(&cifs_sb->tlink_tree_lock);
4013
4014 if (tlink == NULL) {
4015 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4016 if (newtlink == NULL)
4017 return ERR_PTR(-ENOMEM);
4018 newtlink->tl_uid = fsuid;
4019 newtlink->tl_tcon = ERR_PTR(-EACCES);
4020 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4021 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4022 cifs_get_tlink(newtlink);
4023
4024 spin_lock(&cifs_sb->tlink_tree_lock);
4025 /* was one inserted after previous search? */
4026 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4027 if (tlink) {
4028 cifs_get_tlink(tlink);
4029 spin_unlock(&cifs_sb->tlink_tree_lock);
4030 kfree(newtlink);
4031 goto wait_for_construction;
4032 }
4033 tlink = newtlink;
4034 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4035 spin_unlock(&cifs_sb->tlink_tree_lock);
4036 } else {
4037wait_for_construction:
4038 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4039 cifs_sb_tcon_pending_wait,
4040 TASK_INTERRUPTIBLE);
4041 if (ret) {
4042 cifs_put_tlink(tlink);
4043 return ERR_PTR(ret);
4044 }
4045
4046 /* if it's good, return it */
4047 if (!IS_ERR(tlink->tl_tcon))
4048 return tlink;
4049
4050 /* return error if we tried this already recently */
4051 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4052 cifs_put_tlink(tlink);
4053 return ERR_PTR(-EACCES);
4054 }
4055
4056 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4057 goto wait_for_construction;
4058 }
4059
4060 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4061 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4062 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4063
4064 if (IS_ERR(tlink->tl_tcon)) {
4065 cifs_put_tlink(tlink);
4066 return ERR_PTR(-EACCES);
4067 }
4068
4069 return tlink;
4070}
4071
4072/*
4073 * periodic workqueue job that scans tcon_tree for a superblock and closes
4074 * out tcons.
4075 */
4076static void
4077cifs_prune_tlinks(struct work_struct *work)
4078{
4079 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4080 prune_tlinks.work);
4081 struct rb_root *root = &cifs_sb->tlink_tree;
4082 struct rb_node *node = rb_first(root);
4083 struct rb_node *tmp;
4084 struct tcon_link *tlink;
4085
4086 /*
4087 * Because we drop the spinlock in the loop in order to put the tlink
4088 * it's not guarded against removal of links from the tree. The only
4089 * places that remove entries from the tree are this function and
4090 * umounts. Because this function is non-reentrant and is canceled
4091 * before umount can proceed, this is safe.
4092 */
4093 spin_lock(&cifs_sb->tlink_tree_lock);
4094 node = rb_first(root);
4095 while (node != NULL) {
4096 tmp = node;
4097 node = rb_next(tmp);
4098 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4099
4100 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4101 atomic_read(&tlink->tl_count) != 0 ||
4102 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4103 continue;
4104
4105 cifs_get_tlink(tlink);
4106 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4107 rb_erase(tmp, root);
4108
4109 spin_unlock(&cifs_sb->tlink_tree_lock);
4110 cifs_put_tlink(tlink);
4111 spin_lock(&cifs_sb->tlink_tree_lock);
4112 }
4113 spin_unlock(&cifs_sb->tlink_tree_lock);
4114
4115 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4116 TLINK_IDLE_EXPIRE);
4117}