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Linux 3.12.28
[linux/fpc-iii.git] / fs / cifs / connect.c
blob89b5519085c2bdf7b9d6c13cf98076d097497677
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
59 extern 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
65 enum {
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
113 static 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
232 enum {
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
242 static 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 */
260 enum {
261 Opt_cache_loose,
262 Opt_cache_strict,
263 Opt_cache_none,
264 Opt_cache_err
265 };
266
267 static 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
274 static 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
282 static int ip_connect(struct TCP_Server_Info *server);
283 static int generic_ip_connect(struct TCP_Server_Info *server);
284 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
285 static void cifs_prune_tlinks(struct work_struct *work);
286 static 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 */
297 int
298 cifs_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
400 static void
401 cifs_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
423 requeue_echo:
424 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
425 }
426
427 static bool
428 allocate_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
460 static bool
461 server_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 */
498 static unsigned int
499 kvec_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
521 static struct kvec *
522 get_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
539 int
540 cifs_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
598 int
599 cifs_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
610 static bool
611 is_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
654 void
655 dequeue_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
669 static void
670 handle_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
689 static 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
777 static int
778 standard_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
833 static int
834 cifs_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 */
948 static char *
949 extract_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
975 static 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
989 static 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
1007 static 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
1025 static 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
1082 static int
1083 cifs_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
1107 static int
1108 cifs_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 */
1146 static int
1147 cifs_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
1188 static int
1189 cifs_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
1888 out_nomem:
1889 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1890 cifs_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 */
1900 static bool
1901 srcip_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 */
1927 static bool
1928 match_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
1957 static bool
1958 match_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
1994 static bool
1995 match_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
2016 static 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
2042 static struct TCP_Server_Info *
2043 cifs_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
2061 static void
2062 cifs_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
2095 static struct TCP_Server_Info *
2096 cifs_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 #ifdef CONFIG_CIFS_SMB2
2148 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2149 #endif
2150 /*
2151 * at this point we are the only ones with the pointer
2152 * to the struct since the kernel thread not created yet
2153 * no need to spinlock this init of tcpStatus or srv_count
2154 */
2155 tcp_ses->tcpStatus = CifsNew;
2156 ++tcp_ses->srv_count;
2157
2158 rc = ip_connect(tcp_ses);
2159 if (rc < 0) {
2160 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2161 goto out_err_crypto_release;
2162 }
2163
2164 /*
2165 * since we're in a cifs function already, we know that
2166 * this will succeed. No need for try_module_get().
2167 */
2168 __module_get(THIS_MODULE);
2169 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2170 tcp_ses, "cifsd");
2171 if (IS_ERR(tcp_ses->tsk)) {
2172 rc = PTR_ERR(tcp_ses->tsk);
2173 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2174 module_put(THIS_MODULE);
2175 goto out_err_crypto_release;
2176 }
2177 tcp_ses->tcpStatus = CifsNeedNegotiate;
2178
2179 /* thread spawned, put it on the list */
2180 spin_lock(&cifs_tcp_ses_lock);
2181 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2182 spin_unlock(&cifs_tcp_ses_lock);
2183
2184 cifs_fscache_get_client_cookie(tcp_ses);
2185
2186 /* queue echo request delayed work */
2187 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2188
2189 return tcp_ses;
2190
2191 out_err_crypto_release:
2192 cifs_crypto_shash_release(tcp_ses);
2193
2194 put_net(cifs_net_ns(tcp_ses));
2195
2196 out_err:
2197 if (tcp_ses) {
2198 if (!IS_ERR(tcp_ses->hostname))
2199 kfree(tcp_ses->hostname);
2200 if (tcp_ses->ssocket)
2201 sock_release(tcp_ses->ssocket);
2202 kfree(tcp_ses);
2203 }
2204 return ERR_PTR(rc);
2205 }
2206
2207 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2208 {
2209 if (vol->sectype != Unspecified &&
2210 vol->sectype != ses->sectype)
2211 return 0;
2212
2213 switch (ses->sectype) {
2214 case Kerberos:
2215 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2216 return 0;
2217 break;
2218 default:
2219 /* NULL username means anonymous session */
2220 if (ses->user_name == NULL) {
2221 if (!vol->nullauth)
2222 return 0;
2223 break;
2224 }
2225
2226 /* anything else takes username/password */
2227 if (strncmp(ses->user_name,
2228 vol->username ? vol->username : "",
2229 CIFS_MAX_USERNAME_LEN))
2230 return 0;
2231 if (strlen(vol->username) != 0 &&
2232 ses->password != NULL &&
2233 strncmp(ses->password,
2234 vol->password ? vol->password : "",
2235 CIFS_MAX_PASSWORD_LEN))
2236 return 0;
2237 }
2238 return 1;
2239 }
2240
2241 static struct cifs_ses *
2242 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2243 {
2244 struct cifs_ses *ses;
2245
2246 spin_lock(&cifs_tcp_ses_lock);
2247 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2248 if (!match_session(ses, vol))
2249 continue;
2250 ++ses->ses_count;
2251 spin_unlock(&cifs_tcp_ses_lock);
2252 return ses;
2253 }
2254 spin_unlock(&cifs_tcp_ses_lock);
2255 return NULL;
2256 }
2257
2258 static void
2259 cifs_put_smb_ses(struct cifs_ses *ses)
2260 {
2261 unsigned int xid;
2262 struct TCP_Server_Info *server = ses->server;
2263
2264 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2265 spin_lock(&cifs_tcp_ses_lock);
2266 if (--ses->ses_count > 0) {
2267 spin_unlock(&cifs_tcp_ses_lock);
2268 return;
2269 }
2270
2271 list_del_init(&ses->smb_ses_list);
2272 spin_unlock(&cifs_tcp_ses_lock);
2273
2274 if (ses->status == CifsGood && server->ops->logoff) {
2275 xid = get_xid();
2276 server->ops->logoff(xid, ses);
2277 _free_xid(xid);
2278 }
2279 sesInfoFree(ses);
2280 cifs_put_tcp_session(server);
2281 }
2282
2283 #ifdef CONFIG_KEYS
2284
2285 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2286 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2287
2288 /* Populate username and pw fields from keyring if possible */
2289 static int
2290 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2291 {
2292 int rc = 0;
2293 char *desc, *delim, *payload;
2294 ssize_t len;
2295 struct key *key;
2296 struct TCP_Server_Info *server = ses->server;
2297 struct sockaddr_in *sa;
2298 struct sockaddr_in6 *sa6;
2299 struct user_key_payload *upayload;
2300
2301 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2302 if (!desc)
2303 return -ENOMEM;
2304
2305 /* try to find an address key first */
2306 switch (server->dstaddr.ss_family) {
2307 case AF_INET:
2308 sa = (struct sockaddr_in *)&server->dstaddr;
2309 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2310 break;
2311 case AF_INET6:
2312 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2313 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2314 break;
2315 default:
2316 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2317 server->dstaddr.ss_family);
2318 rc = -EINVAL;
2319 goto out_err;
2320 }
2321
2322 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2323 key = request_key(&key_type_logon, desc, "");
2324 if (IS_ERR(key)) {
2325 if (!ses->domainName) {
2326 cifs_dbg(FYI, "domainName is NULL\n");
2327 rc = PTR_ERR(key);
2328 goto out_err;
2329 }
2330
2331 /* didn't work, try to find a domain key */
2332 sprintf(desc, "cifs:d:%s", ses->domainName);
2333 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2334 key = request_key(&key_type_logon, desc, "");
2335 if (IS_ERR(key)) {
2336 rc = PTR_ERR(key);
2337 goto out_err;
2338 }
2339 }
2340
2341 down_read(&key->sem);
2342 upayload = key->payload.data;
2343 if (IS_ERR_OR_NULL(upayload)) {
2344 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2345 goto out_key_put;
2346 }
2347
2348 /* find first : in payload */
2349 payload = (char *)upayload->data;
2350 delim = strnchr(payload, upayload->datalen, ':');
2351 cifs_dbg(FYI, "payload=%s\n", payload);
2352 if (!delim) {
2353 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2354 upayload->datalen);
2355 rc = -EINVAL;
2356 goto out_key_put;
2357 }
2358
2359 len = delim - payload;
2360 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2361 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2362 len);
2363 rc = -EINVAL;
2364 goto out_key_put;
2365 }
2366
2367 vol->username = kstrndup(payload, len, GFP_KERNEL);
2368 if (!vol->username) {
2369 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2370 len);
2371 rc = -ENOMEM;
2372 goto out_key_put;
2373 }
2374 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2375
2376 len = key->datalen - (len + 1);
2377 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2378 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2379 rc = -EINVAL;
2380 kfree(vol->username);
2381 vol->username = NULL;
2382 goto out_key_put;
2383 }
2384
2385 ++delim;
2386 vol->password = kstrndup(delim, len, GFP_KERNEL);
2387 if (!vol->password) {
2388 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2389 len);
2390 rc = -ENOMEM;
2391 kfree(vol->username);
2392 vol->username = NULL;
2393 goto out_key_put;
2394 }
2395
2396 out_key_put:
2397 up_read(&key->sem);
2398 key_put(key);
2399 out_err:
2400 kfree(desc);
2401 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2402 return rc;
2403 }
2404 #else /* ! CONFIG_KEYS */
2405 static inline int
2406 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2407 struct cifs_ses *ses __attribute__((unused)))
2408 {
2409 return -ENOSYS;
2410 }
2411 #endif /* CONFIG_KEYS */
2412
2413 static struct cifs_ses *
2414 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2415 {
2416 int rc = -ENOMEM;
2417 unsigned int xid;
2418 struct cifs_ses *ses;
2419 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2420 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2421
2422 xid = get_xid();
2423
2424 ses = cifs_find_smb_ses(server, volume_info);
2425 if (ses) {
2426 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2427 ses->status);
2428
2429 mutex_lock(&ses->session_mutex);
2430 rc = cifs_negotiate_protocol(xid, ses);
2431 if (rc) {
2432 mutex_unlock(&ses->session_mutex);
2433 /* problem -- put our ses reference */
2434 cifs_put_smb_ses(ses);
2435 free_xid(xid);
2436 return ERR_PTR(rc);
2437 }
2438 if (ses->need_reconnect) {
2439 cifs_dbg(FYI, "Session needs reconnect\n");
2440 rc = cifs_setup_session(xid, ses,
2441 volume_info->local_nls);
2442 if (rc) {
2443 mutex_unlock(&ses->session_mutex);
2444 /* problem -- put our reference */
2445 cifs_put_smb_ses(ses);
2446 free_xid(xid);
2447 return ERR_PTR(rc);
2448 }
2449 }
2450 mutex_unlock(&ses->session_mutex);
2451
2452 /* existing SMB ses has a server reference already */
2453 cifs_put_tcp_session(server);
2454 free_xid(xid);
2455 return ses;
2456 }
2457
2458 cifs_dbg(FYI, "Existing smb sess not found\n");
2459 ses = sesInfoAlloc();
2460 if (ses == NULL)
2461 goto get_ses_fail;
2462
2463 /* new SMB session uses our server ref */
2464 ses->server = server;
2465 if (server->dstaddr.ss_family == AF_INET6)
2466 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2467 else
2468 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2469
2470 if (volume_info->username) {
2471 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2472 if (!ses->user_name)
2473 goto get_ses_fail;
2474 }
2475
2476 /* volume_info->password freed at unmount */
2477 if (volume_info->password) {
2478 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2479 if (!ses->password)
2480 goto get_ses_fail;
2481 }
2482 if (volume_info->domainname) {
2483 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2484 if (!ses->domainName)
2485 goto get_ses_fail;
2486 }
2487 ses->cred_uid = volume_info->cred_uid;
2488 ses->linux_uid = volume_info->linux_uid;
2489
2490 ses->sectype = volume_info->sectype;
2491 ses->sign = volume_info->sign;
2492
2493 mutex_lock(&ses->session_mutex);
2494 rc = cifs_negotiate_protocol(xid, ses);
2495 if (!rc)
2496 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2497 mutex_unlock(&ses->session_mutex);
2498 if (rc)
2499 goto get_ses_fail;
2500
2501 /* success, put it on the list */
2502 spin_lock(&cifs_tcp_ses_lock);
2503 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2504 spin_unlock(&cifs_tcp_ses_lock);
2505
2506 free_xid(xid);
2507 return ses;
2508
2509 get_ses_fail:
2510 sesInfoFree(ses);
2511 free_xid(xid);
2512 return ERR_PTR(rc);
2513 }
2514
2515 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2516 {
2517 if (tcon->tidStatus == CifsExiting)
2518 return 0;
2519 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2520 return 0;
2521 return 1;
2522 }
2523
2524 static struct cifs_tcon *
2525 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2526 {
2527 struct list_head *tmp;
2528 struct cifs_tcon *tcon;
2529
2530 spin_lock(&cifs_tcp_ses_lock);
2531 list_for_each(tmp, &ses->tcon_list) {
2532 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2533 if (!match_tcon(tcon, unc))
2534 continue;
2535 ++tcon->tc_count;
2536 spin_unlock(&cifs_tcp_ses_lock);
2537 return tcon;
2538 }
2539 spin_unlock(&cifs_tcp_ses_lock);
2540 return NULL;
2541 }
2542
2543 static void
2544 cifs_put_tcon(struct cifs_tcon *tcon)
2545 {
2546 unsigned int xid;
2547 struct cifs_ses *ses = tcon->ses;
2548
2549 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2550 spin_lock(&cifs_tcp_ses_lock);
2551 if (--tcon->tc_count > 0) {
2552 spin_unlock(&cifs_tcp_ses_lock);
2553 return;
2554 }
2555
2556 list_del_init(&tcon->tcon_list);
2557 spin_unlock(&cifs_tcp_ses_lock);
2558
2559 xid = get_xid();
2560 if (ses->server->ops->tree_disconnect)
2561 ses->server->ops->tree_disconnect(xid, tcon);
2562 _free_xid(xid);
2563
2564 cifs_fscache_release_super_cookie(tcon);
2565 tconInfoFree(tcon);
2566 cifs_put_smb_ses(ses);
2567 }
2568
2569 static struct cifs_tcon *
2570 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2571 {
2572 int rc, xid;
2573 struct cifs_tcon *tcon;
2574
2575 tcon = cifs_find_tcon(ses, volume_info->UNC);
2576 if (tcon) {
2577 cifs_dbg(FYI, "Found match on UNC path\n");
2578 /* existing tcon already has a reference */
2579 cifs_put_smb_ses(ses);
2580 if (tcon->seal != volume_info->seal)
2581 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2582 return tcon;
2583 }
2584
2585 if (!ses->server->ops->tree_connect) {
2586 rc = -ENOSYS;
2587 goto out_fail;
2588 }
2589
2590 tcon = tconInfoAlloc();
2591 if (tcon == NULL) {
2592 rc = -ENOMEM;
2593 goto out_fail;
2594 }
2595
2596 tcon->ses = ses;
2597 if (volume_info->password) {
2598 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2599 if (!tcon->password) {
2600 rc = -ENOMEM;
2601 goto out_fail;
2602 }
2603 }
2604
2605 /*
2606 * BB Do we need to wrap session_mutex around this TCon call and Unix
2607 * SetFS as we do on SessSetup and reconnect?
2608 */
2609 xid = get_xid();
2610 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2611 volume_info->local_nls);
2612 free_xid(xid);
2613 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2614 if (rc)
2615 goto out_fail;
2616
2617 if (volume_info->nodfs) {
2618 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2619 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2620 }
2621 tcon->seal = volume_info->seal;
2622 /*
2623 * We can have only one retry value for a connection to a share so for
2624 * resources mounted more than once to the same server share the last
2625 * value passed in for the retry flag is used.
2626 */
2627 tcon->retry = volume_info->retry;
2628 tcon->nocase = volume_info->nocase;
2629 tcon->local_lease = volume_info->local_lease;
2630 INIT_LIST_HEAD(&tcon->pending_opens);
2631
2632 spin_lock(&cifs_tcp_ses_lock);
2633 list_add(&tcon->tcon_list, &ses->tcon_list);
2634 spin_unlock(&cifs_tcp_ses_lock);
2635
2636 cifs_fscache_get_super_cookie(tcon);
2637
2638 return tcon;
2639
2640 out_fail:
2641 tconInfoFree(tcon);
2642 return ERR_PTR(rc);
2643 }
2644
2645 void
2646 cifs_put_tlink(struct tcon_link *tlink)
2647 {
2648 if (!tlink || IS_ERR(tlink))
2649 return;
2650
2651 if (!atomic_dec_and_test(&tlink->tl_count) ||
2652 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2653 tlink->tl_time = jiffies;
2654 return;
2655 }
2656
2657 if (!IS_ERR(tlink_tcon(tlink)))
2658 cifs_put_tcon(tlink_tcon(tlink));
2659 kfree(tlink);
2660 return;
2661 }
2662
2663 static inline struct tcon_link *
2664 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2665 {
2666 return cifs_sb->master_tlink;
2667 }
2668
2669 static int
2670 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2671 {
2672 struct cifs_sb_info *old = CIFS_SB(sb);
2673 struct cifs_sb_info *new = mnt_data->cifs_sb;
2674
2675 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2676 return 0;
2677
2678 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2679 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2680 return 0;
2681
2682 /*
2683 * We want to share sb only if we don't specify an r/wsize or
2684 * specified r/wsize is greater than or equal to existing one.
2685 */
2686 if (new->wsize && new->wsize < old->wsize)
2687 return 0;
2688
2689 if (new->rsize && new->rsize < old->rsize)
2690 return 0;
2691
2692 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2693 return 0;
2694
2695 if (old->mnt_file_mode != new->mnt_file_mode ||
2696 old->mnt_dir_mode != new->mnt_dir_mode)
2697 return 0;
2698
2699 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2700 return 0;
2701
2702 if (old->actimeo != new->actimeo)
2703 return 0;
2704
2705 return 1;
2706 }
2707
2708 int
2709 cifs_match_super(struct super_block *sb, void *data)
2710 {
2711 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2712 struct smb_vol *volume_info;
2713 struct cifs_sb_info *cifs_sb;
2714 struct TCP_Server_Info *tcp_srv;
2715 struct cifs_ses *ses;
2716 struct cifs_tcon *tcon;
2717 struct tcon_link *tlink;
2718 int rc = 0;
2719
2720 spin_lock(&cifs_tcp_ses_lock);
2721 cifs_sb = CIFS_SB(sb);
2722 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2723 if (IS_ERR(tlink)) {
2724 spin_unlock(&cifs_tcp_ses_lock);
2725 return rc;
2726 }
2727 tcon = tlink_tcon(tlink);
2728 ses = tcon->ses;
2729 tcp_srv = ses->server;
2730
2731 volume_info = mnt_data->vol;
2732
2733 if (!match_server(tcp_srv, volume_info) ||
2734 !match_session(ses, volume_info) ||
2735 !match_tcon(tcon, volume_info->UNC)) {
2736 rc = 0;
2737 goto out;
2738 }
2739
2740 rc = compare_mount_options(sb, mnt_data);
2741 out:
2742 spin_unlock(&cifs_tcp_ses_lock);
2743 cifs_put_tlink(tlink);
2744 return rc;
2745 }
2746
2747 int
2748 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2749 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2750 struct dfs_info3_param **referrals, int remap)
2751 {
2752 char *temp_unc;
2753 int rc = 0;
2754
2755 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2756 return -ENOSYS;
2757
2758 *num_referrals = 0;
2759 *referrals = NULL;
2760
2761 if (ses->ipc_tid == 0) {
2762 temp_unc = kmalloc(2 /* for slashes */ +
2763 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2764 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2765 if (temp_unc == NULL)
2766 return -ENOMEM;
2767 temp_unc[0] = '\\';
2768 temp_unc[1] = '\\';
2769 strcpy(temp_unc + 2, ses->serverName);
2770 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2771 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2772 nls_codepage);
2773 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2774 kfree(temp_unc);
2775 }
2776 if (rc == 0)
2777 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2778 referrals, num_referrals,
2779 nls_codepage, remap);
2780 /*
2781 * BB - map targetUNCs to dfs_info3 structures, here or in
2782 * ses->server->ops->get_dfs_refer.
2783 */
2784
2785 return rc;
2786 }
2787
2788 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2789 static struct lock_class_key cifs_key[2];
2790 static struct lock_class_key cifs_slock_key[2];
2791
2792 static inline void
2793 cifs_reclassify_socket4(struct socket *sock)
2794 {
2795 struct sock *sk = sock->sk;
2796 BUG_ON(sock_owned_by_user(sk));
2797 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2798 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2799 }
2800
2801 static inline void
2802 cifs_reclassify_socket6(struct socket *sock)
2803 {
2804 struct sock *sk = sock->sk;
2805 BUG_ON(sock_owned_by_user(sk));
2806 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2807 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2808 }
2809 #else
2810 static inline void
2811 cifs_reclassify_socket4(struct socket *sock)
2812 {
2813 }
2814
2815 static inline void
2816 cifs_reclassify_socket6(struct socket *sock)
2817 {
2818 }
2819 #endif
2820
2821 /* See RFC1001 section 14 on representation of Netbios names */
2822 static void rfc1002mangle(char *target, char *source, unsigned int length)
2823 {
2824 unsigned int i, j;
2825
2826 for (i = 0, j = 0; i < (length); i++) {
2827 /* mask a nibble at a time and encode */
2828 target[j] = 'A' + (0x0F & (source[i] >> 4));
2829 target[j+1] = 'A' + (0x0F & source[i]);
2830 j += 2;
2831 }
2832
2833 }
2834
2835 static int
2836 bind_socket(struct TCP_Server_Info *server)
2837 {
2838 int rc = 0;
2839 if (server->srcaddr.ss_family != AF_UNSPEC) {
2840 /* Bind to the specified local IP address */
2841 struct socket *socket = server->ssocket;
2842 rc = socket->ops->bind(socket,
2843 (struct sockaddr *) &server->srcaddr,
2844 sizeof(server->srcaddr));
2845 if (rc < 0) {
2846 struct sockaddr_in *saddr4;
2847 struct sockaddr_in6 *saddr6;
2848 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2849 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2850 if (saddr6->sin6_family == AF_INET6)
2851 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2852 &saddr6->sin6_addr, rc);
2853 else
2854 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2855 &saddr4->sin_addr.s_addr, rc);
2856 }
2857 }
2858 return rc;
2859 }
2860
2861 static int
2862 ip_rfc1001_connect(struct TCP_Server_Info *server)
2863 {
2864 int rc = 0;
2865 /*
2866 * some servers require RFC1001 sessinit before sending
2867 * negprot - BB check reconnection in case where second
2868 * sessinit is sent but no second negprot
2869 */
2870 struct rfc1002_session_packet *ses_init_buf;
2871 struct smb_hdr *smb_buf;
2872 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2873 GFP_KERNEL);
2874 if (ses_init_buf) {
2875 ses_init_buf->trailer.session_req.called_len = 32;
2876
2877 if (server->server_RFC1001_name &&
2878 server->server_RFC1001_name[0] != 0)
2879 rfc1002mangle(ses_init_buf->trailer.
2880 session_req.called_name,
2881 server->server_RFC1001_name,
2882 RFC1001_NAME_LEN_WITH_NULL);
2883 else
2884 rfc1002mangle(ses_init_buf->trailer.
2885 session_req.called_name,
2886 DEFAULT_CIFS_CALLED_NAME,
2887 RFC1001_NAME_LEN_WITH_NULL);
2888
2889 ses_init_buf->trailer.session_req.calling_len = 32;
2890
2891 /*
2892 * calling name ends in null (byte 16) from old smb
2893 * convention.
2894 */
2895 if (server->workstation_RFC1001_name &&
2896 server->workstation_RFC1001_name[0] != 0)
2897 rfc1002mangle(ses_init_buf->trailer.
2898 session_req.calling_name,
2899 server->workstation_RFC1001_name,
2900 RFC1001_NAME_LEN_WITH_NULL);
2901 else
2902 rfc1002mangle(ses_init_buf->trailer.
2903 session_req.calling_name,
2904 "LINUX_CIFS_CLNT",
2905 RFC1001_NAME_LEN_WITH_NULL);
2906
2907 ses_init_buf->trailer.session_req.scope1 = 0;
2908 ses_init_buf->trailer.session_req.scope2 = 0;
2909 smb_buf = (struct smb_hdr *)ses_init_buf;
2910
2911 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2912 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2913 rc = smb_send(server, smb_buf, 0x44);
2914 kfree(ses_init_buf);
2915 /*
2916 * RFC1001 layer in at least one server
2917 * requires very short break before negprot
2918 * presumably because not expecting negprot
2919 * to follow so fast. This is a simple
2920 * solution that works without
2921 * complicating the code and causes no
2922 * significant slowing down on mount
2923 * for everyone else
2924 */
2925 usleep_range(1000, 2000);
2926 }
2927 /*
2928 * else the negprot may still work without this
2929 * even though malloc failed
2930 */
2931
2932 return rc;
2933 }
2934
2935 static int
2936 generic_ip_connect(struct TCP_Server_Info *server)
2937 {
2938 int rc = 0;
2939 __be16 sport;
2940 int slen, sfamily;
2941 struct socket *socket = server->ssocket;
2942 struct sockaddr *saddr;
2943
2944 saddr = (struct sockaddr *) &server->dstaddr;
2945
2946 if (server->dstaddr.ss_family == AF_INET6) {
2947 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2948 slen = sizeof(struct sockaddr_in6);
2949 sfamily = AF_INET6;
2950 } else {
2951 sport = ((struct sockaddr_in *) saddr)->sin_port;
2952 slen = sizeof(struct sockaddr_in);
2953 sfamily = AF_INET;
2954 }
2955
2956 if (socket == NULL) {
2957 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2958 IPPROTO_TCP, &socket, 1);
2959 if (rc < 0) {
2960 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2961 server->ssocket = NULL;
2962 return rc;
2963 }
2964
2965 /* BB other socket options to set KEEPALIVE, NODELAY? */
2966 cifs_dbg(FYI, "Socket created\n");
2967 server->ssocket = socket;
2968 socket->sk->sk_allocation = GFP_NOFS;
2969 if (sfamily == AF_INET6)
2970 cifs_reclassify_socket6(socket);
2971 else
2972 cifs_reclassify_socket4(socket);
2973 }
2974
2975 rc = bind_socket(server);
2976 if (rc < 0)
2977 return rc;
2978
2979 /*
2980 * Eventually check for other socket options to change from
2981 * the default. sock_setsockopt not used because it expects
2982 * user space buffer
2983 */
2984 socket->sk->sk_rcvtimeo = 7 * HZ;
2985 socket->sk->sk_sndtimeo = 5 * HZ;
2986
2987 /* make the bufsizes depend on wsize/rsize and max requests */
2988 if (server->noautotune) {
2989 if (socket->sk->sk_sndbuf < (200 * 1024))
2990 socket->sk->sk_sndbuf = 200 * 1024;
2991 if (socket->sk->sk_rcvbuf < (140 * 1024))
2992 socket->sk->sk_rcvbuf = 140 * 1024;
2993 }
2994
2995 if (server->tcp_nodelay) {
2996 int val = 1;
2997 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2998 (char *)&val, sizeof(val));
2999 if (rc)
3000 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3001 rc);
3002 }
3003
3004 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3005 socket->sk->sk_sndbuf,
3006 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3007
3008 rc = socket->ops->connect(socket, saddr, slen, 0);
3009 if (rc < 0) {
3010 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3011 sock_release(socket);
3012 server->ssocket = NULL;
3013 return rc;
3014 }
3015
3016 if (sport == htons(RFC1001_PORT))
3017 rc = ip_rfc1001_connect(server);
3018
3019 return rc;
3020 }
3021
3022 static int
3023 ip_connect(struct TCP_Server_Info *server)
3024 {
3025 __be16 *sport;
3026 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3027 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3028
3029 if (server->dstaddr.ss_family == AF_INET6)
3030 sport = &addr6->sin6_port;
3031 else
3032 sport = &addr->sin_port;
3033
3034 if (*sport == 0) {
3035 int rc;
3036
3037 /* try with 445 port at first */
3038 *sport = htons(CIFS_PORT);
3039
3040 rc = generic_ip_connect(server);
3041 if (rc >= 0)
3042 return rc;
3043
3044 /* if it failed, try with 139 port */
3045 *sport = htons(RFC1001_PORT);
3046 }
3047
3048 return generic_ip_connect(server);
3049 }
3050
3051 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3052 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3053 {
3054 /* if we are reconnecting then should we check to see if
3055 * any requested capabilities changed locally e.g. via
3056 * remount but we can not do much about it here
3057 * if they have (even if we could detect it by the following)
3058 * Perhaps we could add a backpointer to array of sb from tcon
3059 * or if we change to make all sb to same share the same
3060 * sb as NFS - then we only have one backpointer to sb.
3061 * What if we wanted to mount the server share twice once with
3062 * and once without posixacls or posix paths? */
3063 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3064
3065 if (vol_info && vol_info->no_linux_ext) {
3066 tcon->fsUnixInfo.Capability = 0;
3067 tcon->unix_ext = 0; /* Unix Extensions disabled */
3068 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3069 return;
3070 } else if (vol_info)
3071 tcon->unix_ext = 1; /* Unix Extensions supported */
3072
3073 if (tcon->unix_ext == 0) {
3074 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3075 return;
3076 }
3077
3078 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3079 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3080 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3081 /* check for reconnect case in which we do not
3082 want to change the mount behavior if we can avoid it */
3083 if (vol_info == NULL) {
3084 /* turn off POSIX ACL and PATHNAMES if not set
3085 originally at mount time */
3086 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3087 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3088 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3089 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3090 cifs_dbg(VFS, "POSIXPATH support change\n");
3091 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3092 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3093 cifs_dbg(VFS, "possible reconnect error\n");
3094 cifs_dbg(VFS, "server disabled POSIX path support\n");
3095 }
3096 }
3097
3098 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3099 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3100
3101 cap &= CIFS_UNIX_CAP_MASK;
3102 if (vol_info && vol_info->no_psx_acl)
3103 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3104 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3105 cifs_dbg(FYI, "negotiated posix acl support\n");
3106 if (cifs_sb)
3107 cifs_sb->mnt_cifs_flags |=
3108 CIFS_MOUNT_POSIXACL;
3109 }
3110
3111 if (vol_info && vol_info->posix_paths == 0)
3112 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3113 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3114 cifs_dbg(FYI, "negotiate posix pathnames\n");
3115 if (cifs_sb)
3116 cifs_sb->mnt_cifs_flags |=
3117 CIFS_MOUNT_POSIX_PATHS;
3118 }
3119
3120 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3121 #ifdef CONFIG_CIFS_DEBUG2
3122 if (cap & CIFS_UNIX_FCNTL_CAP)
3123 cifs_dbg(FYI, "FCNTL cap\n");
3124 if (cap & CIFS_UNIX_EXTATTR_CAP)
3125 cifs_dbg(FYI, "EXTATTR cap\n");
3126 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3127 cifs_dbg(FYI, "POSIX path cap\n");
3128 if (cap & CIFS_UNIX_XATTR_CAP)
3129 cifs_dbg(FYI, "XATTR cap\n");
3130 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3131 cifs_dbg(FYI, "POSIX ACL cap\n");
3132 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3133 cifs_dbg(FYI, "very large read cap\n");
3134 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3135 cifs_dbg(FYI, "very large write cap\n");
3136 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3137 cifs_dbg(FYI, "transport encryption cap\n");
3138 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3139 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3140 #endif /* CIFS_DEBUG2 */
3141 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3142 if (vol_info == NULL) {
3143 cifs_dbg(FYI, "resetting capabilities failed\n");
3144 } else
3145 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");
3146
3147 }
3148 }
3149 }
3150
3151 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3152 struct cifs_sb_info *cifs_sb)
3153 {
3154 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3155
3156 spin_lock_init(&cifs_sb->tlink_tree_lock);
3157 cifs_sb->tlink_tree = RB_ROOT;
3158
3159 /*
3160 * Temporarily set r/wsize for matching superblock. If we end up using
3161 * new sb then client will later negotiate it downward if needed.
3162 */
3163 cifs_sb->rsize = pvolume_info->rsize;
3164 cifs_sb->wsize = pvolume_info->wsize;
3165
3166 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3167 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3168 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3169 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3170 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3171 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3172
3173 cifs_sb->actimeo = pvolume_info->actimeo;
3174 cifs_sb->local_nls = pvolume_info->local_nls;
3175
3176 if (pvolume_info->noperm)
3177 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3178 if (pvolume_info->setuids)
3179 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3180 if (pvolume_info->server_ino)
3181 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3182 if (pvolume_info->remap)
3183 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3184 if (pvolume_info->no_xattr)
3185 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3186 if (pvolume_info->sfu_emul)
3187 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3188 if (pvolume_info->nobrl)
3189 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3190 if (pvolume_info->nostrictsync)
3191 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3192 if (pvolume_info->mand_lock)
3193 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3194 if (pvolume_info->rwpidforward)
3195 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3196 if (pvolume_info->cifs_acl)
3197 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3198 if (pvolume_info->backupuid_specified) {
3199 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3200 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3201 }
3202 if (pvolume_info->backupgid_specified) {
3203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3204 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3205 }
3206 if (pvolume_info->override_uid)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3208 if (pvolume_info->override_gid)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3210 if (pvolume_info->dynperm)
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3212 if (pvolume_info->fsc)
3213 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3214 if (pvolume_info->multiuser)
3215 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3216 CIFS_MOUNT_NO_PERM);
3217 if (pvolume_info->strict_io)
3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3219 if (pvolume_info->direct_io) {
3220 cifs_dbg(FYI, "mounting share using direct i/o\n");
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3222 }
3223 if (pvolume_info->mfsymlinks) {
3224 if (pvolume_info->sfu_emul) {
3225 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3226 } else {
3227 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3228 }
3229 }
3230
3231 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3232 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3233 }
3234
3235 static void
3236 cleanup_volume_info_contents(struct smb_vol *volume_info)
3237 {
3238 kfree(volume_info->username);
3239 kzfree(volume_info->password);
3240 kfree(volume_info->UNC);
3241 kfree(volume_info->domainname);
3242 kfree(volume_info->iocharset);
3243 kfree(volume_info->prepath);
3244 }
3245
3246 void
3247 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3248 {
3249 if (!volume_info)
3250 return;
3251 cleanup_volume_info_contents(volume_info);
3252 kfree(volume_info);
3253 }
3254
3255
3256 #ifdef CONFIG_CIFS_DFS_UPCALL
3257 /*
3258 * cifs_build_path_to_root returns full path to root when we do not have an
3259 * exiting connection (tcon)
3260 */
3261 static char *
3262 build_unc_path_to_root(const struct smb_vol *vol,
3263 const struct cifs_sb_info *cifs_sb)
3264 {
3265 char *full_path, *pos;
3266 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3267 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3268
3269 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3270 if (full_path == NULL)
3271 return ERR_PTR(-ENOMEM);
3272
3273 strncpy(full_path, vol->UNC, unc_len);
3274 pos = full_path + unc_len;
3275
3276 if (pplen) {
3277 *pos = CIFS_DIR_SEP(cifs_sb);
3278 strncpy(pos + 1, vol->prepath, pplen);
3279 pos += pplen;
3280 }
3281
3282 *pos = '\0'; /* add trailing null */
3283 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3284 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3285 return full_path;
3286 }
3287
3288 /*
3289 * Perform a dfs referral query for a share and (optionally) prefix
3290 *
3291 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3292 * to a string containing updated options for the submount. Otherwise it
3293 * will be left untouched.
3294 *
3295 * Returns the rc from get_dfs_path to the caller, which can be used to
3296 * determine whether there were referrals.
3297 */
3298 static int
3299 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3300 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3301 int check_prefix)
3302 {
3303 int rc;
3304 unsigned int num_referrals = 0;
3305 struct dfs_info3_param *referrals = NULL;
3306 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3307
3308 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3309 if (IS_ERR(full_path))
3310 return PTR_ERR(full_path);
3311
3312 /* For DFS paths, skip the first '\' of the UNC */
3313 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3314
3315 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3316 &num_referrals, &referrals,
3317 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3318
3319 if (!rc && num_referrals > 0) {
3320 char *fake_devname = NULL;
3321
3322 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3323 full_path + 1, referrals,
3324 &fake_devname);
3325
3326 free_dfs_info_array(referrals, num_referrals);
3327
3328 if (IS_ERR(mdata)) {
3329 rc = PTR_ERR(mdata);
3330 mdata = NULL;
3331 } else {
3332 cleanup_volume_info_contents(volume_info);
3333 rc = cifs_setup_volume_info(volume_info, mdata,
3334 fake_devname);
3335 }
3336 kfree(fake_devname);
3337 kfree(cifs_sb->mountdata);
3338 cifs_sb->mountdata = mdata;
3339 }
3340 kfree(full_path);
3341 return rc;
3342 }
3343 #endif
3344
3345 static int
3346 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3347 const char *devname)
3348 {
3349 int rc = 0;
3350
3351 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3352 return -EINVAL;
3353
3354 if (volume_info->nullauth) {
3355 cifs_dbg(FYI, "Anonymous login\n");
3356 kfree(volume_info->username);
3357 volume_info->username = NULL;
3358 } else if (volume_info->username) {
3359 /* BB fixme parse for domain name here */
3360 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3361 } else {
3362 cifs_dbg(VFS, "No username specified\n");
3363 /* In userspace mount helper we can get user name from alternate
3364 locations such as env variables and files on disk */
3365 return -EINVAL;
3366 }
3367
3368 /* this is needed for ASCII cp to Unicode converts */
3369 if (volume_info->iocharset == NULL) {
3370 /* load_nls_default cannot return null */
3371 volume_info->local_nls = load_nls_default();
3372 } else {
3373 volume_info->local_nls = load_nls(volume_info->iocharset);
3374 if (volume_info->local_nls == NULL) {
3375 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3376 volume_info->iocharset);
3377 return -ELIBACC;
3378 }
3379 }
3380
3381 return rc;
3382 }
3383
3384 struct smb_vol *
3385 cifs_get_volume_info(char *mount_data, const char *devname)
3386 {
3387 int rc;
3388 struct smb_vol *volume_info;
3389
3390 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3391 if (!volume_info)
3392 return ERR_PTR(-ENOMEM);
3393
3394 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3395 if (rc) {
3396 cifs_cleanup_volume_info(volume_info);
3397 volume_info = ERR_PTR(rc);
3398 }
3399
3400 return volume_info;
3401 }
3402
3403 int
3404 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3405 {
3406 int rc;
3407 unsigned int xid;
3408 struct cifs_ses *ses;
3409 struct cifs_tcon *tcon;
3410 struct TCP_Server_Info *server;
3411 char *full_path;
3412 struct tcon_link *tlink;
3413 #ifdef CONFIG_CIFS_DFS_UPCALL
3414 int referral_walks_count = 0;
3415 #endif
3416
3417 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3418 if (rc)
3419 return rc;
3420
3421 #ifdef CONFIG_CIFS_DFS_UPCALL
3422 try_mount_again:
3423 /* cleanup activities if we're chasing a referral */
3424 if (referral_walks_count) {
3425 if (tcon)
3426 cifs_put_tcon(tcon);
3427 else if (ses)
3428 cifs_put_smb_ses(ses);
3429
3430 free_xid(xid);
3431 }
3432 #endif
3433 rc = 0;
3434 tcon = NULL;
3435 ses = NULL;
3436 server = NULL;
3437 full_path = NULL;
3438 tlink = NULL;
3439
3440 xid = get_xid();
3441
3442 /* get a reference to a tcp session */
3443 server = cifs_get_tcp_session(volume_info);
3444 if (IS_ERR(server)) {
3445 rc = PTR_ERR(server);
3446 bdi_destroy(&cifs_sb->bdi);
3447 goto out;
3448 }
3449
3450 /* get a reference to a SMB session */
3451 ses = cifs_get_smb_ses(server, volume_info);
3452 if (IS_ERR(ses)) {
3453 rc = PTR_ERR(ses);
3454 ses = NULL;
3455 goto mount_fail_check;
3456 }
3457
3458 /* search for existing tcon to this server share */
3459 tcon = cifs_get_tcon(ses, volume_info);
3460 if (IS_ERR(tcon)) {
3461 rc = PTR_ERR(tcon);
3462 tcon = NULL;
3463 goto remote_path_check;
3464 }
3465
3466 /* tell server which Unix caps we support */
3467 if (cap_unix(tcon->ses)) {
3468 /* reset of caps checks mount to see if unix extensions
3469 disabled for just this mount */
3470 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3471 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3472 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3473 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3474 rc = -EACCES;
3475 goto mount_fail_check;
3476 }
3477 } else
3478 tcon->unix_ext = 0; /* server does not support them */
3479
3480 /* do not care if a following call succeed - informational */
3481 if (!tcon->ipc && server->ops->qfs_tcon)
3482 server->ops->qfs_tcon(xid, tcon);
3483
3484 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3485 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3486
3487 /* tune readahead according to rsize */
3488 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3489
3490 remote_path_check:
3491 #ifdef CONFIG_CIFS_DFS_UPCALL
3492 /*
3493 * Perform an unconditional check for whether there are DFS
3494 * referrals for this path without prefix, to provide support
3495 * for DFS referrals from w2k8 servers which don't seem to respond
3496 * with PATH_NOT_COVERED to requests that include the prefix.
3497 * Chase the referral if found, otherwise continue normally.
3498 */
3499 if (referral_walks_count == 0) {
3500 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3501 false);
3502 if (!refrc) {
3503 referral_walks_count++;
3504 goto try_mount_again;
3505 }
3506 }
3507 #endif
3508
3509 /* check if a whole path is not remote */
3510 if (!rc && tcon) {
3511 if (!server->ops->is_path_accessible) {
3512 rc = -ENOSYS;
3513 goto mount_fail_check;
3514 }
3515 /*
3516 * cifs_build_path_to_root works only when we have a valid tcon
3517 */
3518 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3519 if (full_path == NULL) {
3520 rc = -ENOMEM;
3521 goto mount_fail_check;
3522 }
3523 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3524 full_path);
3525 if (rc != 0 && rc != -EREMOTE) {
3526 kfree(full_path);
3527 goto mount_fail_check;
3528 }
3529 kfree(full_path);
3530 }
3531
3532 /* get referral if needed */
3533 if (rc == -EREMOTE) {
3534 #ifdef CONFIG_CIFS_DFS_UPCALL
3535 if (referral_walks_count > MAX_NESTED_LINKS) {
3536 /*
3537 * BB: when we implement proper loop detection,
3538 * we will remove this check. But now we need it
3539 * to prevent an indefinite loop if 'DFS tree' is
3540 * misconfigured (i.e. has loops).
3541 */
3542 rc = -ELOOP;
3543 goto mount_fail_check;
3544 }
3545
3546 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3547
3548 if (!rc) {
3549 referral_walks_count++;
3550 goto try_mount_again;
3551 }
3552 goto mount_fail_check;
3553 #else /* No DFS support, return error on mount */
3554 rc = -EOPNOTSUPP;
3555 #endif
3556 }
3557
3558 if (rc)
3559 goto mount_fail_check;
3560
3561 /* now, hang the tcon off of the superblock */
3562 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3563 if (tlink == NULL) {
3564 rc = -ENOMEM;
3565 goto mount_fail_check;
3566 }
3567
3568 tlink->tl_uid = ses->linux_uid;
3569 tlink->tl_tcon = tcon;
3570 tlink->tl_time = jiffies;
3571 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3572 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3573
3574 cifs_sb->master_tlink = tlink;
3575 spin_lock(&cifs_sb->tlink_tree_lock);
3576 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3577 spin_unlock(&cifs_sb->tlink_tree_lock);
3578
3579 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3580 TLINK_IDLE_EXPIRE);
3581
3582 mount_fail_check:
3583 /* on error free sesinfo and tcon struct if needed */
3584 if (rc) {
3585 /* If find_unc succeeded then rc == 0 so we can not end */
3586 /* up accidentally freeing someone elses tcon struct */
3587 if (tcon)
3588 cifs_put_tcon(tcon);
3589 else if (ses)
3590 cifs_put_smb_ses(ses);
3591 else
3592 cifs_put_tcp_session(server);
3593 bdi_destroy(&cifs_sb->bdi);
3594 }
3595
3596 out:
3597 free_xid(xid);
3598 return rc;
3599 }
3600
3601 /*
3602 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3603 * pointer may be NULL.
3604 */
3605 int
3606 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3607 const char *tree, struct cifs_tcon *tcon,
3608 const struct nls_table *nls_codepage)
3609 {
3610 struct smb_hdr *smb_buffer;
3611 struct smb_hdr *smb_buffer_response;
3612 TCONX_REQ *pSMB;
3613 TCONX_RSP *pSMBr;
3614 unsigned char *bcc_ptr;
3615 int rc = 0;
3616 int length;
3617 __u16 bytes_left, count;
3618
3619 if (ses == NULL)
3620 return -EIO;
3621
3622 smb_buffer = cifs_buf_get();
3623 if (smb_buffer == NULL)
3624 return -ENOMEM;
3625
3626 smb_buffer_response = smb_buffer;
3627
3628 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3629 NULL /*no tid */ , 4 /*wct */ );
3630
3631 smb_buffer->Mid = get_next_mid(ses->server);
3632 smb_buffer->Uid = ses->Suid;
3633 pSMB = (TCONX_REQ *) smb_buffer;
3634 pSMBr = (TCONX_RSP *) smb_buffer_response;
3635
3636 pSMB->AndXCommand = 0xFF;
3637 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3638 bcc_ptr = &pSMB->Password[0];
3639 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3640 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3641 *bcc_ptr = 0; /* password is null byte */
3642 bcc_ptr++; /* skip password */
3643 /* already aligned so no need to do it below */
3644 } else {
3645 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3646 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3647 specified as required (when that support is added to
3648 the vfs in the future) as only NTLM or the much
3649 weaker LANMAN (which we do not send by default) is accepted
3650 by Samba (not sure whether other servers allow
3651 NTLMv2 password here) */
3652 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3653 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3654 (ses->sectype == LANMAN))
3655 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3656 ses->server->sec_mode &
3657 SECMODE_PW_ENCRYPT ? true : false,
3658 bcc_ptr);
3659 else
3660 #endif /* CIFS_WEAK_PW_HASH */
3661 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3662 bcc_ptr, nls_codepage);
3663
3664 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3665 if (ses->capabilities & CAP_UNICODE) {
3666 /* must align unicode strings */
3667 *bcc_ptr = 0; /* null byte password */
3668 bcc_ptr++;
3669 }
3670 }
3671
3672 if (ses->server->sign)
3673 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3674
3675 if (ses->capabilities & CAP_STATUS32) {
3676 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3677 }
3678 if (ses->capabilities & CAP_DFS) {
3679 smb_buffer->Flags2 |= SMBFLG2_DFS;
3680 }
3681 if (ses->capabilities & CAP_UNICODE) {
3682 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3683 length =
3684 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3685 6 /* max utf8 char length in bytes */ *
3686 (/* server len*/ + 256 /* share len */), nls_codepage);
3687 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3688 bcc_ptr += 2; /* skip trailing null */
3689 } else { /* ASCII */
3690 strcpy(bcc_ptr, tree);
3691 bcc_ptr += strlen(tree) + 1;
3692 }
3693 strcpy(bcc_ptr, "?????");
3694 bcc_ptr += strlen("?????");
3695 bcc_ptr += 1;
3696 count = bcc_ptr - &pSMB->Password[0];
3697 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3698 pSMB->hdr.smb_buf_length) + count);
3699 pSMB->ByteCount = cpu_to_le16(count);
3700
3701 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3702 0);
3703
3704 /* above now done in SendReceive */
3705 if ((rc == 0) && (tcon != NULL)) {
3706 bool is_unicode;
3707
3708 tcon->tidStatus = CifsGood;
3709 tcon->need_reconnect = false;
3710 tcon->tid = smb_buffer_response->Tid;
3711 bcc_ptr = pByteArea(smb_buffer_response);
3712 bytes_left = get_bcc(smb_buffer_response);
3713 length = strnlen(bcc_ptr, bytes_left - 2);
3714 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3715 is_unicode = true;
3716 else
3717 is_unicode = false;
3718
3719
3720 /* skip service field (NB: this field is always ASCII) */
3721 if (length == 3) {
3722 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3723 (bcc_ptr[2] == 'C')) {
3724 cifs_dbg(FYI, "IPC connection\n");
3725 tcon->ipc = 1;
3726 }
3727 } else if (length == 2) {
3728 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3729 /* the most common case */
3730 cifs_dbg(FYI, "disk share connection\n");
3731 }
3732 }
3733 bcc_ptr += length + 1;
3734 bytes_left -= (length + 1);
3735 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3736
3737 /* mostly informational -- no need to fail on error here */
3738 kfree(tcon->nativeFileSystem);
3739 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3740 bytes_left, is_unicode,
3741 nls_codepage);
3742
3743 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3744
3745 if ((smb_buffer_response->WordCount == 3) ||
3746 (smb_buffer_response->WordCount == 7))
3747 /* field is in same location */
3748 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3749 else
3750 tcon->Flags = 0;
3751 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3752 } else if ((rc == 0) && tcon == NULL) {
3753 /* all we need to save for IPC$ connection */
3754 ses->ipc_tid = smb_buffer_response->Tid;
3755 }
3756
3757 cifs_buf_release(smb_buffer);
3758 return rc;
3759 }
3760
3761 void
3762 cifs_umount(struct cifs_sb_info *cifs_sb)
3763 {
3764 struct rb_root *root = &cifs_sb->tlink_tree;
3765 struct rb_node *node;
3766 struct tcon_link *tlink;
3767
3768 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3769
3770 spin_lock(&cifs_sb->tlink_tree_lock);
3771 while ((node = rb_first(root))) {
3772 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3773 cifs_get_tlink(tlink);
3774 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3775 rb_erase(node, root);
3776
3777 spin_unlock(&cifs_sb->tlink_tree_lock);
3778 cifs_put_tlink(tlink);
3779 spin_lock(&cifs_sb->tlink_tree_lock);
3780 }
3781 spin_unlock(&cifs_sb->tlink_tree_lock);
3782
3783 bdi_destroy(&cifs_sb->bdi);
3784 kfree(cifs_sb->mountdata);
3785 unload_nls(cifs_sb->local_nls);
3786 kfree(cifs_sb);
3787 }
3788
3789 int
3790 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3791 {
3792 int rc = 0;
3793 struct TCP_Server_Info *server = ses->server;
3794
3795 if (!server->ops->need_neg || !server->ops->negotiate)
3796 return -ENOSYS;
3797
3798 /* only send once per connect */
3799 if (!server->ops->need_neg(server))
3800 return 0;
3801
3802 set_credits(server, 1);
3803
3804 rc = server->ops->negotiate(xid, ses);
3805 if (rc == 0) {
3806 spin_lock(&GlobalMid_Lock);
3807 if (server->tcpStatus == CifsNeedNegotiate)
3808 server->tcpStatus = CifsGood;
3809 else
3810 rc = -EHOSTDOWN;
3811 spin_unlock(&GlobalMid_Lock);
3812 }
3813
3814 return rc;
3815 }
3816
3817 int
3818 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3819 struct nls_table *nls_info)
3820 {
3821 int rc = -ENOSYS;
3822 struct TCP_Server_Info *server = ses->server;
3823
3824 ses->capabilities = server->capabilities;
3825 if (linuxExtEnabled == 0)
3826 ses->capabilities &= (~server->vals->cap_unix);
3827
3828 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3829 server->sec_mode, server->capabilities, server->timeAdj);
3830
3831 if (server->ops->sess_setup)
3832 rc = server->ops->sess_setup(xid, ses, nls_info);
3833
3834 if (rc)
3835 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3836
3837 return rc;
3838 }
3839
3840 static int
3841 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3842 {
3843 vol->sectype = ses->sectype;
3844
3845 /* krb5 is special, since we don't need username or pw */
3846 if (vol->sectype == Kerberos)
3847 return 0;
3848
3849 return cifs_set_cifscreds(vol, ses);
3850 }
3851
3852 static struct cifs_tcon *
3853 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3854 {
3855 int rc;
3856 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3857 struct cifs_ses *ses;
3858 struct cifs_tcon *tcon = NULL;
3859 struct smb_vol *vol_info;
3860
3861 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3862 if (vol_info == NULL)
3863 return ERR_PTR(-ENOMEM);
3864
3865 vol_info->local_nls = cifs_sb->local_nls;
3866 vol_info->linux_uid = fsuid;
3867 vol_info->cred_uid = fsuid;
3868 vol_info->UNC = master_tcon->treeName;
3869 vol_info->retry = master_tcon->retry;
3870 vol_info->nocase = master_tcon->nocase;
3871 vol_info->local_lease = master_tcon->local_lease;
3872 vol_info->no_linux_ext = !master_tcon->unix_ext;
3873 vol_info->sectype = master_tcon->ses->sectype;
3874 vol_info->sign = master_tcon->ses->sign;
3875
3876 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3877 if (rc) {
3878 tcon = ERR_PTR(rc);
3879 goto out;
3880 }
3881
3882 /* get a reference for the same TCP session */
3883 spin_lock(&cifs_tcp_ses_lock);
3884 ++master_tcon->ses->server->srv_count;
3885 spin_unlock(&cifs_tcp_ses_lock);
3886
3887 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3888 if (IS_ERR(ses)) {
3889 tcon = (struct cifs_tcon *)ses;
3890 cifs_put_tcp_session(master_tcon->ses->server);
3891 goto out;
3892 }
3893
3894 tcon = cifs_get_tcon(ses, vol_info);
3895 if (IS_ERR(tcon)) {
3896 cifs_put_smb_ses(ses);
3897 goto out;
3898 }
3899
3900 if (cap_unix(ses))
3901 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3902 out:
3903 kfree(vol_info->username);
3904 kfree(vol_info->password);
3905 kfree(vol_info);
3906
3907 return tcon;
3908 }
3909
3910 struct cifs_tcon *
3911 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3912 {
3913 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3914 }
3915
3916 static int
3917 cifs_sb_tcon_pending_wait(void *unused)
3918 {
3919 schedule();
3920 return signal_pending(current) ? -ERESTARTSYS : 0;
3921 }
3922
3923 /* find and return a tlink with given uid */
3924 static struct tcon_link *
3925 tlink_rb_search(struct rb_root *root, kuid_t uid)
3926 {
3927 struct rb_node *node = root->rb_node;
3928 struct tcon_link *tlink;
3929
3930 while (node) {
3931 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3932
3933 if (uid_gt(tlink->tl_uid, uid))
3934 node = node->rb_left;
3935 else if (uid_lt(tlink->tl_uid, uid))
3936 node = node->rb_right;
3937 else
3938 return tlink;
3939 }
3940 return NULL;
3941 }
3942
3943 /* insert a tcon_link into the tree */
3944 static void
3945 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3946 {
3947 struct rb_node **new = &(root->rb_node), *parent = NULL;
3948 struct tcon_link *tlink;
3949
3950 while (*new) {
3951 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3952 parent = *new;
3953
3954 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3955 new = &((*new)->rb_left);
3956 else
3957 new = &((*new)->rb_right);
3958 }
3959
3960 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3961 rb_insert_color(&new_tlink->tl_rbnode, root);
3962 }
3963
3964 /*
3965 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3966 * current task.
3967 *
3968 * If the superblock doesn't refer to a multiuser mount, then just return
3969 * the master tcon for the mount.
3970 *
3971 * First, search the rbtree for an existing tcon for this fsuid. If one
3972 * exists, then check to see if it's pending construction. If it is then wait
3973 * for construction to complete. Once it's no longer pending, check to see if
3974 * it failed and either return an error or retry construction, depending on
3975 * the timeout.
3976 *
3977 * If one doesn't exist then insert a new tcon_link struct into the tree and
3978 * try to construct a new one.
3979 */
3980 struct tcon_link *
3981 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3982 {
3983 int ret;
3984 kuid_t fsuid = current_fsuid();
3985 struct tcon_link *tlink, *newtlink;
3986
3987 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3988 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3989
3990 spin_lock(&cifs_sb->tlink_tree_lock);
3991 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3992 if (tlink)
3993 cifs_get_tlink(tlink);
3994 spin_unlock(&cifs_sb->tlink_tree_lock);
3995
3996 if (tlink == NULL) {
3997 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3998 if (newtlink == NULL)
3999 return ERR_PTR(-ENOMEM);
4000 newtlink->tl_uid = fsuid;
4001 newtlink->tl_tcon = ERR_PTR(-EACCES);
4002 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4003 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4004 cifs_get_tlink(newtlink);
4005
4006 spin_lock(&cifs_sb->tlink_tree_lock);
4007 /* was one inserted after previous search? */
4008 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4009 if (tlink) {
4010 cifs_get_tlink(tlink);
4011 spin_unlock(&cifs_sb->tlink_tree_lock);
4012 kfree(newtlink);
4013 goto wait_for_construction;
4014 }
4015 tlink = newtlink;
4016 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4017 spin_unlock(&cifs_sb->tlink_tree_lock);
4018 } else {
4019 wait_for_construction:
4020 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4021 cifs_sb_tcon_pending_wait,
4022 TASK_INTERRUPTIBLE);
4023 if (ret) {
4024 cifs_put_tlink(tlink);
4025 return ERR_PTR(ret);
4026 }
4027
4028 /* if it's good, return it */
4029 if (!IS_ERR(tlink->tl_tcon))
4030 return tlink;
4031
4032 /* return error if we tried this already recently */
4033 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4034 cifs_put_tlink(tlink);
4035 return ERR_PTR(-EACCES);
4036 }
4037
4038 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4039 goto wait_for_construction;
4040 }
4041
4042 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4043 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4044 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4045
4046 if (IS_ERR(tlink->tl_tcon)) {
4047 cifs_put_tlink(tlink);
4048 return ERR_PTR(-EACCES);
4049 }
4050
4051 return tlink;
4052 }
4053
4054 /*
4055 * periodic workqueue job that scans tcon_tree for a superblock and closes
4056 * out tcons.
4057 */
4058 static void
4059 cifs_prune_tlinks(struct work_struct *work)
4060 {
4061 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4062 prune_tlinks.work);
4063 struct rb_root *root = &cifs_sb->tlink_tree;
4064 struct rb_node *node = rb_first(root);
4065 struct rb_node *tmp;
4066 struct tcon_link *tlink;
4067
4068 /*
4069 * Because we drop the spinlock in the loop in order to put the tlink
4070 * it's not guarded against removal of links from the tree. The only
4071 * places that remove entries from the tree are this function and
4072 * umounts. Because this function is non-reentrant and is canceled
4073 * before umount can proceed, this is safe.
4074 */
4075 spin_lock(&cifs_sb->tlink_tree_lock);
4076 node = rb_first(root);
4077 while (node != NULL) {
4078 tmp = node;
4079 node = rb_next(tmp);
4080 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4081
4082 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4083 atomic_read(&tlink->tl_count) != 0 ||
4084 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4085 continue;
4086
4087 cifs_get_tlink(tlink);
4088 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4089 rb_erase(tmp, root);
4090
4091 spin_unlock(&cifs_sb->tlink_tree_lock);
4092 cifs_put_tlink(tlink);
4093 spin_lock(&cifs_sb->tlink_tree_lock);
4094 }
4095 spin_unlock(&cifs_sb->tlink_tree_lock);
4096
4097 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4098 TLINK_IDLE_EXPIRE);
4099 }
Linux with added FPC-III support