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37950c65453c4b0b7e39238764b2dfc8dbbec3ae
[deliverable/linux.git] / fs / cifs / connect.c
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 = &smb21_operations; /* currently identical with 2.1 */
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, MAX_USERNAME_SIZE) >
1581 MAX_USERNAME_SIZE) {
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 /*
2148 * at this point we are the only ones with the pointer
2149 * to the struct since the kernel thread not created yet
2150 * no need to spinlock this init of tcpStatus or srv_count
2151 */
2152 tcp_ses->tcpStatus = CifsNew;
2153 ++tcp_ses->srv_count;
2154
2155 rc = ip_connect(tcp_ses);
2156 if (rc < 0) {
2157 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2158 goto out_err_crypto_release;
2159 }
2160
2161 /*
2162 * since we're in a cifs function already, we know that
2163 * this will succeed. No need for try_module_get().
2164 */
2165 __module_get(THIS_MODULE);
2166 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2167 tcp_ses, "cifsd");
2168 if (IS_ERR(tcp_ses->tsk)) {
2169 rc = PTR_ERR(tcp_ses->tsk);
2170 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2171 module_put(THIS_MODULE);
2172 goto out_err_crypto_release;
2173 }
2174 tcp_ses->tcpStatus = CifsNeedNegotiate;
2175
2176 /* thread spawned, put it on the list */
2177 spin_lock(&cifs_tcp_ses_lock);
2178 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2179 spin_unlock(&cifs_tcp_ses_lock);
2180
2181 cifs_fscache_get_client_cookie(tcp_ses);
2182
2183 /* queue echo request delayed work */
2184 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2185
2186 return tcp_ses;
2187
2188 out_err_crypto_release:
2189 cifs_crypto_shash_release(tcp_ses);
2190
2191 put_net(cifs_net_ns(tcp_ses));
2192
2193 out_err:
2194 if (tcp_ses) {
2195 if (!IS_ERR(tcp_ses->hostname))
2196 kfree(tcp_ses->hostname);
2197 if (tcp_ses->ssocket)
2198 sock_release(tcp_ses->ssocket);
2199 kfree(tcp_ses);
2200 }
2201 return ERR_PTR(rc);
2202 }
2203
2204 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2205 {
2206 if (vol->sectype != Unspecified &&
2207 vol->sectype != ses->sectype)
2208 return 0;
2209
2210 switch (ses->sectype) {
2211 case Kerberos:
2212 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2213 return 0;
2214 break;
2215 default:
2216 /* NULL username means anonymous session */
2217 if (ses->user_name == NULL) {
2218 if (!vol->nullauth)
2219 return 0;
2220 break;
2221 }
2222
2223 /* anything else takes username/password */
2224 if (strncmp(ses->user_name,
2225 vol->username ? vol->username : "",
2226 MAX_USERNAME_SIZE))
2227 return 0;
2228 if (strlen(vol->username) != 0 &&
2229 ses->password != NULL &&
2230 strncmp(ses->password,
2231 vol->password ? vol->password : "",
2232 MAX_PASSWORD_SIZE))
2233 return 0;
2234 }
2235 return 1;
2236 }
2237
2238 static struct cifs_ses *
2239 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2240 {
2241 struct cifs_ses *ses;
2242
2243 spin_lock(&cifs_tcp_ses_lock);
2244 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2245 if (!match_session(ses, vol))
2246 continue;
2247 ++ses->ses_count;
2248 spin_unlock(&cifs_tcp_ses_lock);
2249 return ses;
2250 }
2251 spin_unlock(&cifs_tcp_ses_lock);
2252 return NULL;
2253 }
2254
2255 static void
2256 cifs_put_smb_ses(struct cifs_ses *ses)
2257 {
2258 unsigned int xid;
2259 struct TCP_Server_Info *server = ses->server;
2260
2261 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2262 spin_lock(&cifs_tcp_ses_lock);
2263 if (--ses->ses_count > 0) {
2264 spin_unlock(&cifs_tcp_ses_lock);
2265 return;
2266 }
2267
2268 list_del_init(&ses->smb_ses_list);
2269 spin_unlock(&cifs_tcp_ses_lock);
2270
2271 if (ses->status == CifsGood && server->ops->logoff) {
2272 xid = get_xid();
2273 server->ops->logoff(xid, ses);
2274 _free_xid(xid);
2275 }
2276 sesInfoFree(ses);
2277 cifs_put_tcp_session(server);
2278 }
2279
2280 #ifdef CONFIG_KEYS
2281
2282 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2283 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2284
2285 /* Populate username and pw fields from keyring if possible */
2286 static int
2287 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2288 {
2289 int rc = 0;
2290 char *desc, *delim, *payload;
2291 ssize_t len;
2292 struct key *key;
2293 struct TCP_Server_Info *server = ses->server;
2294 struct sockaddr_in *sa;
2295 struct sockaddr_in6 *sa6;
2296 struct user_key_payload *upayload;
2297
2298 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2299 if (!desc)
2300 return -ENOMEM;
2301
2302 /* try to find an address key first */
2303 switch (server->dstaddr.ss_family) {
2304 case AF_INET:
2305 sa = (struct sockaddr_in *)&server->dstaddr;
2306 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2307 break;
2308 case AF_INET6:
2309 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2310 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2311 break;
2312 default:
2313 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2314 server->dstaddr.ss_family);
2315 rc = -EINVAL;
2316 goto out_err;
2317 }
2318
2319 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2320 key = request_key(&key_type_logon, desc, "");
2321 if (IS_ERR(key)) {
2322 if (!ses->domainName) {
2323 cifs_dbg(FYI, "domainName is NULL\n");
2324 rc = PTR_ERR(key);
2325 goto out_err;
2326 }
2327
2328 /* didn't work, try to find a domain key */
2329 sprintf(desc, "cifs:d:%s", ses->domainName);
2330 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2331 key = request_key(&key_type_logon, desc, "");
2332 if (IS_ERR(key)) {
2333 rc = PTR_ERR(key);
2334 goto out_err;
2335 }
2336 }
2337
2338 down_read(&key->sem);
2339 upayload = key->payload.data;
2340 if (IS_ERR_OR_NULL(upayload)) {
2341 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2342 goto out_key_put;
2343 }
2344
2345 /* find first : in payload */
2346 payload = (char *)upayload->data;
2347 delim = strnchr(payload, upayload->datalen, ':');
2348 cifs_dbg(FYI, "payload=%s\n", payload);
2349 if (!delim) {
2350 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2351 upayload->datalen);
2352 rc = -EINVAL;
2353 goto out_key_put;
2354 }
2355
2356 len = delim - payload;
2357 if (len > MAX_USERNAME_SIZE || len <= 0) {
2358 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2359 len);
2360 rc = -EINVAL;
2361 goto out_key_put;
2362 }
2363
2364 vol->username = kstrndup(payload, len, GFP_KERNEL);
2365 if (!vol->username) {
2366 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2367 len);
2368 rc = -ENOMEM;
2369 goto out_key_put;
2370 }
2371 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2372
2373 len = key->datalen - (len + 1);
2374 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2375 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2376 rc = -EINVAL;
2377 kfree(vol->username);
2378 vol->username = NULL;
2379 goto out_key_put;
2380 }
2381
2382 ++delim;
2383 vol->password = kstrndup(delim, len, GFP_KERNEL);
2384 if (!vol->password) {
2385 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2386 len);
2387 rc = -ENOMEM;
2388 kfree(vol->username);
2389 vol->username = NULL;
2390 goto out_key_put;
2391 }
2392
2393 out_key_put:
2394 up_read(&key->sem);
2395 key_put(key);
2396 out_err:
2397 kfree(desc);
2398 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2399 return rc;
2400 }
2401 #else /* ! CONFIG_KEYS */
2402 static inline int
2403 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2404 struct cifs_ses *ses __attribute__((unused)))
2405 {
2406 return -ENOSYS;
2407 }
2408 #endif /* CONFIG_KEYS */
2409
2410 static struct cifs_ses *
2411 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2412 {
2413 int rc = -ENOMEM;
2414 unsigned int xid;
2415 struct cifs_ses *ses;
2416 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2417 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2418
2419 xid = get_xid();
2420
2421 ses = cifs_find_smb_ses(server, volume_info);
2422 if (ses) {
2423 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2424 ses->status);
2425
2426 mutex_lock(&ses->session_mutex);
2427 rc = cifs_negotiate_protocol(xid, ses);
2428 if (rc) {
2429 mutex_unlock(&ses->session_mutex);
2430 /* problem -- put our ses reference */
2431 cifs_put_smb_ses(ses);
2432 free_xid(xid);
2433 return ERR_PTR(rc);
2434 }
2435 if (ses->need_reconnect) {
2436 cifs_dbg(FYI, "Session needs reconnect\n");
2437 rc = cifs_setup_session(xid, ses,
2438 volume_info->local_nls);
2439 if (rc) {
2440 mutex_unlock(&ses->session_mutex);
2441 /* problem -- put our reference */
2442 cifs_put_smb_ses(ses);
2443 free_xid(xid);
2444 return ERR_PTR(rc);
2445 }
2446 }
2447 mutex_unlock(&ses->session_mutex);
2448
2449 /* existing SMB ses has a server reference already */
2450 cifs_put_tcp_session(server);
2451 free_xid(xid);
2452 return ses;
2453 }
2454
2455 cifs_dbg(FYI, "Existing smb sess not found\n");
2456 ses = sesInfoAlloc();
2457 if (ses == NULL)
2458 goto get_ses_fail;
2459
2460 /* new SMB session uses our server ref */
2461 ses->server = server;
2462 if (server->dstaddr.ss_family == AF_INET6)
2463 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2464 else
2465 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2466
2467 if (volume_info->username) {
2468 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2469 if (!ses->user_name)
2470 goto get_ses_fail;
2471 }
2472
2473 /* volume_info->password freed at unmount */
2474 if (volume_info->password) {
2475 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2476 if (!ses->password)
2477 goto get_ses_fail;
2478 }
2479 if (volume_info->domainname) {
2480 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2481 if (!ses->domainName)
2482 goto get_ses_fail;
2483 }
2484 ses->cred_uid = volume_info->cred_uid;
2485 ses->linux_uid = volume_info->linux_uid;
2486
2487 ses->sectype = volume_info->sectype;
2488 ses->sign = volume_info->sign;
2489
2490 mutex_lock(&ses->session_mutex);
2491 rc = cifs_negotiate_protocol(xid, ses);
2492 if (!rc)
2493 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2494 mutex_unlock(&ses->session_mutex);
2495 if (rc)
2496 goto get_ses_fail;
2497
2498 /* success, put it on the list */
2499 spin_lock(&cifs_tcp_ses_lock);
2500 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2501 spin_unlock(&cifs_tcp_ses_lock);
2502
2503 free_xid(xid);
2504 return ses;
2505
2506 get_ses_fail:
2507 sesInfoFree(ses);
2508 free_xid(xid);
2509 return ERR_PTR(rc);
2510 }
2511
2512 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2513 {
2514 if (tcon->tidStatus == CifsExiting)
2515 return 0;
2516 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2517 return 0;
2518 return 1;
2519 }
2520
2521 static struct cifs_tcon *
2522 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2523 {
2524 struct list_head *tmp;
2525 struct cifs_tcon *tcon;
2526
2527 spin_lock(&cifs_tcp_ses_lock);
2528 list_for_each(tmp, &ses->tcon_list) {
2529 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2530 if (!match_tcon(tcon, unc))
2531 continue;
2532 ++tcon->tc_count;
2533 spin_unlock(&cifs_tcp_ses_lock);
2534 return tcon;
2535 }
2536 spin_unlock(&cifs_tcp_ses_lock);
2537 return NULL;
2538 }
2539
2540 static void
2541 cifs_put_tcon(struct cifs_tcon *tcon)
2542 {
2543 unsigned int xid;
2544 struct cifs_ses *ses = tcon->ses;
2545
2546 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2547 spin_lock(&cifs_tcp_ses_lock);
2548 if (--tcon->tc_count > 0) {
2549 spin_unlock(&cifs_tcp_ses_lock);
2550 return;
2551 }
2552
2553 list_del_init(&tcon->tcon_list);
2554 spin_unlock(&cifs_tcp_ses_lock);
2555
2556 xid = get_xid();
2557 if (ses->server->ops->tree_disconnect)
2558 ses->server->ops->tree_disconnect(xid, tcon);
2559 _free_xid(xid);
2560
2561 cifs_fscache_release_super_cookie(tcon);
2562 tconInfoFree(tcon);
2563 cifs_put_smb_ses(ses);
2564 }
2565
2566 static struct cifs_tcon *
2567 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2568 {
2569 int rc, xid;
2570 struct cifs_tcon *tcon;
2571
2572 tcon = cifs_find_tcon(ses, volume_info->UNC);
2573 if (tcon) {
2574 cifs_dbg(FYI, "Found match on UNC path\n");
2575 /* existing tcon already has a reference */
2576 cifs_put_smb_ses(ses);
2577 if (tcon->seal != volume_info->seal)
2578 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2579 return tcon;
2580 }
2581
2582 if (!ses->server->ops->tree_connect) {
2583 rc = -ENOSYS;
2584 goto out_fail;
2585 }
2586
2587 tcon = tconInfoAlloc();
2588 if (tcon == NULL) {
2589 rc = -ENOMEM;
2590 goto out_fail;
2591 }
2592
2593 tcon->ses = ses;
2594 if (volume_info->password) {
2595 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2596 if (!tcon->password) {
2597 rc = -ENOMEM;
2598 goto out_fail;
2599 }
2600 }
2601
2602 /*
2603 * BB Do we need to wrap session_mutex around this TCon call and Unix
2604 * SetFS as we do on SessSetup and reconnect?
2605 */
2606 xid = get_xid();
2607 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2608 volume_info->local_nls);
2609 free_xid(xid);
2610 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2611 if (rc)
2612 goto out_fail;
2613
2614 if (volume_info->nodfs) {
2615 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2616 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2617 }
2618 tcon->seal = volume_info->seal;
2619 /*
2620 * We can have only one retry value for a connection to a share so for
2621 * resources mounted more than once to the same server share the last
2622 * value passed in for the retry flag is used.
2623 */
2624 tcon->retry = volume_info->retry;
2625 tcon->nocase = volume_info->nocase;
2626 tcon->local_lease = volume_info->local_lease;
2627 INIT_LIST_HEAD(&tcon->pending_opens);
2628
2629 spin_lock(&cifs_tcp_ses_lock);
2630 list_add(&tcon->tcon_list, &ses->tcon_list);
2631 spin_unlock(&cifs_tcp_ses_lock);
2632
2633 cifs_fscache_get_super_cookie(tcon);
2634
2635 return tcon;
2636
2637 out_fail:
2638 tconInfoFree(tcon);
2639 return ERR_PTR(rc);
2640 }
2641
2642 void
2643 cifs_put_tlink(struct tcon_link *tlink)
2644 {
2645 if (!tlink || IS_ERR(tlink))
2646 return;
2647
2648 if (!atomic_dec_and_test(&tlink->tl_count) ||
2649 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2650 tlink->tl_time = jiffies;
2651 return;
2652 }
2653
2654 if (!IS_ERR(tlink_tcon(tlink)))
2655 cifs_put_tcon(tlink_tcon(tlink));
2656 kfree(tlink);
2657 return;
2658 }
2659
2660 static inline struct tcon_link *
2661 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2662 {
2663 return cifs_sb->master_tlink;
2664 }
2665
2666 static int
2667 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2668 {
2669 struct cifs_sb_info *old = CIFS_SB(sb);
2670 struct cifs_sb_info *new = mnt_data->cifs_sb;
2671
2672 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2673 return 0;
2674
2675 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2676 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2677 return 0;
2678
2679 /*
2680 * We want to share sb only if we don't specify an r/wsize or
2681 * specified r/wsize is greater than or equal to existing one.
2682 */
2683 if (new->wsize && new->wsize < old->wsize)
2684 return 0;
2685
2686 if (new->rsize && new->rsize < old->rsize)
2687 return 0;
2688
2689 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2690 return 0;
2691
2692 if (old->mnt_file_mode != new->mnt_file_mode ||
2693 old->mnt_dir_mode != new->mnt_dir_mode)
2694 return 0;
2695
2696 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2697 return 0;
2698
2699 if (old->actimeo != new->actimeo)
2700 return 0;
2701
2702 return 1;
2703 }
2704
2705 int
2706 cifs_match_super(struct super_block *sb, void *data)
2707 {
2708 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2709 struct smb_vol *volume_info;
2710 struct cifs_sb_info *cifs_sb;
2711 struct TCP_Server_Info *tcp_srv;
2712 struct cifs_ses *ses;
2713 struct cifs_tcon *tcon;
2714 struct tcon_link *tlink;
2715 int rc = 0;
2716
2717 spin_lock(&cifs_tcp_ses_lock);
2718 cifs_sb = CIFS_SB(sb);
2719 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2720 if (IS_ERR(tlink)) {
2721 spin_unlock(&cifs_tcp_ses_lock);
2722 return rc;
2723 }
2724 tcon = tlink_tcon(tlink);
2725 ses = tcon->ses;
2726 tcp_srv = ses->server;
2727
2728 volume_info = mnt_data->vol;
2729
2730 if (!match_server(tcp_srv, volume_info) ||
2731 !match_session(ses, volume_info) ||
2732 !match_tcon(tcon, volume_info->UNC)) {
2733 rc = 0;
2734 goto out;
2735 }
2736
2737 rc = compare_mount_options(sb, mnt_data);
2738 out:
2739 spin_unlock(&cifs_tcp_ses_lock);
2740 cifs_put_tlink(tlink);
2741 return rc;
2742 }
2743
2744 int
2745 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2746 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2747 struct dfs_info3_param **referrals, int remap)
2748 {
2749 char *temp_unc;
2750 int rc = 0;
2751
2752 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2753 return -ENOSYS;
2754
2755 *num_referrals = 0;
2756 *referrals = NULL;
2757
2758 if (ses->ipc_tid == 0) {
2759 temp_unc = kmalloc(2 /* for slashes */ +
2760 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2761 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2762 if (temp_unc == NULL)
2763 return -ENOMEM;
2764 temp_unc[0] = '\\';
2765 temp_unc[1] = '\\';
2766 strcpy(temp_unc + 2, ses->serverName);
2767 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2768 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2769 nls_codepage);
2770 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2771 kfree(temp_unc);
2772 }
2773 if (rc == 0)
2774 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2775 referrals, num_referrals,
2776 nls_codepage, remap);
2777 /*
2778 * BB - map targetUNCs to dfs_info3 structures, here or in
2779 * ses->server->ops->get_dfs_refer.
2780 */
2781
2782 return rc;
2783 }
2784
2785 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2786 static struct lock_class_key cifs_key[2];
2787 static struct lock_class_key cifs_slock_key[2];
2788
2789 static inline void
2790 cifs_reclassify_socket4(struct socket *sock)
2791 {
2792 struct sock *sk = sock->sk;
2793 BUG_ON(sock_owned_by_user(sk));
2794 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2795 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2796 }
2797
2798 static inline void
2799 cifs_reclassify_socket6(struct socket *sock)
2800 {
2801 struct sock *sk = sock->sk;
2802 BUG_ON(sock_owned_by_user(sk));
2803 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2804 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2805 }
2806 #else
2807 static inline void
2808 cifs_reclassify_socket4(struct socket *sock)
2809 {
2810 }
2811
2812 static inline void
2813 cifs_reclassify_socket6(struct socket *sock)
2814 {
2815 }
2816 #endif
2817
2818 /* See RFC1001 section 14 on representation of Netbios names */
2819 static void rfc1002mangle(char *target, char *source, unsigned int length)
2820 {
2821 unsigned int i, j;
2822
2823 for (i = 0, j = 0; i < (length); i++) {
2824 /* mask a nibble at a time and encode */
2825 target[j] = 'A' + (0x0F & (source[i] >> 4));
2826 target[j+1] = 'A' + (0x0F & source[i]);
2827 j += 2;
2828 }
2829
2830 }
2831
2832 static int
2833 bind_socket(struct TCP_Server_Info *server)
2834 {
2835 int rc = 0;
2836 if (server->srcaddr.ss_family != AF_UNSPEC) {
2837 /* Bind to the specified local IP address */
2838 struct socket *socket = server->ssocket;
2839 rc = socket->ops->bind(socket,
2840 (struct sockaddr *) &server->srcaddr,
2841 sizeof(server->srcaddr));
2842 if (rc < 0) {
2843 struct sockaddr_in *saddr4;
2844 struct sockaddr_in6 *saddr6;
2845 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2846 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2847 if (saddr6->sin6_family == AF_INET6)
2848 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2849 &saddr6->sin6_addr, rc);
2850 else
2851 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2852 &saddr4->sin_addr.s_addr, rc);
2853 }
2854 }
2855 return rc;
2856 }
2857
2858 static int
2859 ip_rfc1001_connect(struct TCP_Server_Info *server)
2860 {
2861 int rc = 0;
2862 /*
2863 * some servers require RFC1001 sessinit before sending
2864 * negprot - BB check reconnection in case where second
2865 * sessinit is sent but no second negprot
2866 */
2867 struct rfc1002_session_packet *ses_init_buf;
2868 struct smb_hdr *smb_buf;
2869 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2870 GFP_KERNEL);
2871 if (ses_init_buf) {
2872 ses_init_buf->trailer.session_req.called_len = 32;
2873
2874 if (server->server_RFC1001_name &&
2875 server->server_RFC1001_name[0] != 0)
2876 rfc1002mangle(ses_init_buf->trailer.
2877 session_req.called_name,
2878 server->server_RFC1001_name,
2879 RFC1001_NAME_LEN_WITH_NULL);
2880 else
2881 rfc1002mangle(ses_init_buf->trailer.
2882 session_req.called_name,
2883 DEFAULT_CIFS_CALLED_NAME,
2884 RFC1001_NAME_LEN_WITH_NULL);
2885
2886 ses_init_buf->trailer.session_req.calling_len = 32;
2887
2888 /*
2889 * calling name ends in null (byte 16) from old smb
2890 * convention.
2891 */
2892 if (server->workstation_RFC1001_name &&
2893 server->workstation_RFC1001_name[0] != 0)
2894 rfc1002mangle(ses_init_buf->trailer.
2895 session_req.calling_name,
2896 server->workstation_RFC1001_name,
2897 RFC1001_NAME_LEN_WITH_NULL);
2898 else
2899 rfc1002mangle(ses_init_buf->trailer.
2900 session_req.calling_name,
2901 "LINUX_CIFS_CLNT",
2902 RFC1001_NAME_LEN_WITH_NULL);
2903
2904 ses_init_buf->trailer.session_req.scope1 = 0;
2905 ses_init_buf->trailer.session_req.scope2 = 0;
2906 smb_buf = (struct smb_hdr *)ses_init_buf;
2907
2908 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2909 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2910 rc = smb_send(server, smb_buf, 0x44);
2911 kfree(ses_init_buf);
2912 /*
2913 * RFC1001 layer in at least one server
2914 * requires very short break before negprot
2915 * presumably because not expecting negprot
2916 * to follow so fast. This is a simple
2917 * solution that works without
2918 * complicating the code and causes no
2919 * significant slowing down on mount
2920 * for everyone else
2921 */
2922 usleep_range(1000, 2000);
2923 }
2924 /*
2925 * else the negprot may still work without this
2926 * even though malloc failed
2927 */
2928
2929 return rc;
2930 }
2931
2932 static int
2933 generic_ip_connect(struct TCP_Server_Info *server)
2934 {
2935 int rc = 0;
2936 __be16 sport;
2937 int slen, sfamily;
2938 struct socket *socket = server->ssocket;
2939 struct sockaddr *saddr;
2940
2941 saddr = (struct sockaddr *) &server->dstaddr;
2942
2943 if (server->dstaddr.ss_family == AF_INET6) {
2944 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2945 slen = sizeof(struct sockaddr_in6);
2946 sfamily = AF_INET6;
2947 } else {
2948 sport = ((struct sockaddr_in *) saddr)->sin_port;
2949 slen = sizeof(struct sockaddr_in);
2950 sfamily = AF_INET;
2951 }
2952
2953 if (socket == NULL) {
2954 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2955 IPPROTO_TCP, &socket, 1);
2956 if (rc < 0) {
2957 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2958 server->ssocket = NULL;
2959 return rc;
2960 }
2961
2962 /* BB other socket options to set KEEPALIVE, NODELAY? */
2963 cifs_dbg(FYI, "Socket created\n");
2964 server->ssocket = socket;
2965 socket->sk->sk_allocation = GFP_NOFS;
2966 if (sfamily == AF_INET6)
2967 cifs_reclassify_socket6(socket);
2968 else
2969 cifs_reclassify_socket4(socket);
2970 }
2971
2972 rc = bind_socket(server);
2973 if (rc < 0)
2974 return rc;
2975
2976 /*
2977 * Eventually check for other socket options to change from
2978 * the default. sock_setsockopt not used because it expects
2979 * user space buffer
2980 */
2981 socket->sk->sk_rcvtimeo = 7 * HZ;
2982 socket->sk->sk_sndtimeo = 5 * HZ;
2983
2984 /* make the bufsizes depend on wsize/rsize and max requests */
2985 if (server->noautotune) {
2986 if (socket->sk->sk_sndbuf < (200 * 1024))
2987 socket->sk->sk_sndbuf = 200 * 1024;
2988 if (socket->sk->sk_rcvbuf < (140 * 1024))
2989 socket->sk->sk_rcvbuf = 140 * 1024;
2990 }
2991
2992 if (server->tcp_nodelay) {
2993 int val = 1;
2994 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2995 (char *)&val, sizeof(val));
2996 if (rc)
2997 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
2998 rc);
2999 }
3000
3001 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3002 socket->sk->sk_sndbuf,
3003 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3004
3005 rc = socket->ops->connect(socket, saddr, slen, 0);
3006 if (rc < 0) {
3007 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3008 sock_release(socket);
3009 server->ssocket = NULL;
3010 return rc;
3011 }
3012
3013 if (sport == htons(RFC1001_PORT))
3014 rc = ip_rfc1001_connect(server);
3015
3016 return rc;
3017 }
3018
3019 static int
3020 ip_connect(struct TCP_Server_Info *server)
3021 {
3022 __be16 *sport;
3023 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3024 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3025
3026 if (server->dstaddr.ss_family == AF_INET6)
3027 sport = &addr6->sin6_port;
3028 else
3029 sport = &addr->sin_port;
3030
3031 if (*sport == 0) {
3032 int rc;
3033
3034 /* try with 445 port at first */
3035 *sport = htons(CIFS_PORT);
3036
3037 rc = generic_ip_connect(server);
3038 if (rc >= 0)
3039 return rc;
3040
3041 /* if it failed, try with 139 port */
3042 *sport = htons(RFC1001_PORT);
3043 }
3044
3045 return generic_ip_connect(server);
3046 }
3047
3048 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3049 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3050 {
3051 /* if we are reconnecting then should we check to see if
3052 * any requested capabilities changed locally e.g. via
3053 * remount but we can not do much about it here
3054 * if they have (even if we could detect it by the following)
3055 * Perhaps we could add a backpointer to array of sb from tcon
3056 * or if we change to make all sb to same share the same
3057 * sb as NFS - then we only have one backpointer to sb.
3058 * What if we wanted to mount the server share twice once with
3059 * and once without posixacls or posix paths? */
3060 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3061
3062 if (vol_info && vol_info->no_linux_ext) {
3063 tcon->fsUnixInfo.Capability = 0;
3064 tcon->unix_ext = 0; /* Unix Extensions disabled */
3065 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3066 return;
3067 } else if (vol_info)
3068 tcon->unix_ext = 1; /* Unix Extensions supported */
3069
3070 if (tcon->unix_ext == 0) {
3071 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3072 return;
3073 }
3074
3075 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3076 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3077 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3078 /* check for reconnect case in which we do not
3079 want to change the mount behavior if we can avoid it */
3080 if (vol_info == NULL) {
3081 /* turn off POSIX ACL and PATHNAMES if not set
3082 originally at mount time */
3083 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3084 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3085 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3086 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3087 cifs_dbg(VFS, "POSIXPATH support change\n");
3088 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3089 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3090 cifs_dbg(VFS, "possible reconnect error\n");
3091 cifs_dbg(VFS, "server disabled POSIX path support\n");
3092 }
3093 }
3094
3095 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3096 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3097
3098 cap &= CIFS_UNIX_CAP_MASK;
3099 if (vol_info && vol_info->no_psx_acl)
3100 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3101 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3102 cifs_dbg(FYI, "negotiated posix acl support\n");
3103 if (cifs_sb)
3104 cifs_sb->mnt_cifs_flags |=
3105 CIFS_MOUNT_POSIXACL;
3106 }
3107
3108 if (vol_info && vol_info->posix_paths == 0)
3109 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3110 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3111 cifs_dbg(FYI, "negotiate posix pathnames\n");
3112 if (cifs_sb)
3113 cifs_sb->mnt_cifs_flags |=
3114 CIFS_MOUNT_POSIX_PATHS;
3115 }
3116
3117 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3118 #ifdef CONFIG_CIFS_DEBUG2
3119 if (cap & CIFS_UNIX_FCNTL_CAP)
3120 cifs_dbg(FYI, "FCNTL cap\n");
3121 if (cap & CIFS_UNIX_EXTATTR_CAP)
3122 cifs_dbg(FYI, "EXTATTR cap\n");
3123 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3124 cifs_dbg(FYI, "POSIX path cap\n");
3125 if (cap & CIFS_UNIX_XATTR_CAP)
3126 cifs_dbg(FYI, "XATTR cap\n");
3127 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3128 cifs_dbg(FYI, "POSIX ACL cap\n");
3129 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3130 cifs_dbg(FYI, "very large read cap\n");
3131 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3132 cifs_dbg(FYI, "very large write cap\n");
3133 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3134 cifs_dbg(FYI, "transport encryption cap\n");
3135 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3136 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3137 #endif /* CIFS_DEBUG2 */
3138 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3139 if (vol_info == NULL) {
3140 cifs_dbg(FYI, "resetting capabilities failed\n");
3141 } else
3142 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");
3143
3144 }
3145 }
3146 }
3147
3148 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3149 struct cifs_sb_info *cifs_sb)
3150 {
3151 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3152
3153 spin_lock_init(&cifs_sb->tlink_tree_lock);
3154 cifs_sb->tlink_tree = RB_ROOT;
3155
3156 /*
3157 * Temporarily set r/wsize for matching superblock. If we end up using
3158 * new sb then client will later negotiate it downward if needed.
3159 */
3160 cifs_sb->rsize = pvolume_info->rsize;
3161 cifs_sb->wsize = pvolume_info->wsize;
3162
3163 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3164 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3165 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3166 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3167 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3168 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3169
3170 cifs_sb->actimeo = pvolume_info->actimeo;
3171 cifs_sb->local_nls = pvolume_info->local_nls;
3172
3173 if (pvolume_info->noperm)
3174 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3175 if (pvolume_info->setuids)
3176 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3177 if (pvolume_info->server_ino)
3178 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3179 if (pvolume_info->remap)
3180 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3181 if (pvolume_info->no_xattr)
3182 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3183 if (pvolume_info->sfu_emul)
3184 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3185 if (pvolume_info->nobrl)
3186 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3187 if (pvolume_info->nostrictsync)
3188 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3189 if (pvolume_info->mand_lock)
3190 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3191 if (pvolume_info->rwpidforward)
3192 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3193 if (pvolume_info->cifs_acl)
3194 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3195 if (pvolume_info->backupuid_specified) {
3196 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3197 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3198 }
3199 if (pvolume_info->backupgid_specified) {
3200 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3201 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3202 }
3203 if (pvolume_info->override_uid)
3204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3205 if (pvolume_info->override_gid)
3206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3207 if (pvolume_info->dynperm)
3208 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3209 if (pvolume_info->fsc)
3210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3211 if (pvolume_info->multiuser)
3212 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3213 CIFS_MOUNT_NO_PERM);
3214 if (pvolume_info->strict_io)
3215 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3216 if (pvolume_info->direct_io) {
3217 cifs_dbg(FYI, "mounting share using direct i/o\n");
3218 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3219 }
3220 if (pvolume_info->mfsymlinks) {
3221 if (pvolume_info->sfu_emul) {
3222 cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n");
3223 } else {
3224 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3225 }
3226 }
3227
3228 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3229 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3230 }
3231
3232 static void
3233 cleanup_volume_info_contents(struct smb_vol *volume_info)
3234 {
3235 kfree(volume_info->username);
3236 kzfree(volume_info->password);
3237 kfree(volume_info->UNC);
3238 kfree(volume_info->domainname);
3239 kfree(volume_info->iocharset);
3240 kfree(volume_info->prepath);
3241 }
3242
3243 void
3244 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3245 {
3246 if (!volume_info)
3247 return;
3248 cleanup_volume_info_contents(volume_info);
3249 kfree(volume_info);
3250 }
3251
3252
3253 #ifdef CONFIG_CIFS_DFS_UPCALL
3254 /*
3255 * cifs_build_path_to_root returns full path to root when we do not have an
3256 * exiting connection (tcon)
3257 */
3258 static char *
3259 build_unc_path_to_root(const struct smb_vol *vol,
3260 const struct cifs_sb_info *cifs_sb)
3261 {
3262 char *full_path, *pos;
3263 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3264 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3265
3266 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3267 if (full_path == NULL)
3268 return ERR_PTR(-ENOMEM);
3269
3270 strncpy(full_path, vol->UNC, unc_len);
3271 pos = full_path + unc_len;
3272
3273 if (pplen) {
3274 *pos = CIFS_DIR_SEP(cifs_sb);
3275 strncpy(pos + 1, vol->prepath, pplen);
3276 pos += pplen;
3277 }
3278
3279 *pos = '\0'; /* add trailing null */
3280 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3281 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3282 return full_path;
3283 }
3284
3285 /*
3286 * Perform a dfs referral query for a share and (optionally) prefix
3287 *
3288 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3289 * to a string containing updated options for the submount. Otherwise it
3290 * will be left untouched.
3291 *
3292 * Returns the rc from get_dfs_path to the caller, which can be used to
3293 * determine whether there were referrals.
3294 */
3295 static int
3296 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3297 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3298 int check_prefix)
3299 {
3300 int rc;
3301 unsigned int num_referrals = 0;
3302 struct dfs_info3_param *referrals = NULL;
3303 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3304
3305 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3306 if (IS_ERR(full_path))
3307 return PTR_ERR(full_path);
3308
3309 /* For DFS paths, skip the first '\' of the UNC */
3310 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3311
3312 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3313 &num_referrals, &referrals,
3314 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3315
3316 if (!rc && num_referrals > 0) {
3317 char *fake_devname = NULL;
3318
3319 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3320 full_path + 1, referrals,
3321 &fake_devname);
3322
3323 free_dfs_info_array(referrals, num_referrals);
3324
3325 if (IS_ERR(mdata)) {
3326 rc = PTR_ERR(mdata);
3327 mdata = NULL;
3328 } else {
3329 cleanup_volume_info_contents(volume_info);
3330 rc = cifs_setup_volume_info(volume_info, mdata,
3331 fake_devname);
3332 }
3333 kfree(fake_devname);
3334 kfree(cifs_sb->mountdata);
3335 cifs_sb->mountdata = mdata;
3336 }
3337 kfree(full_path);
3338 return rc;
3339 }
3340 #endif
3341
3342 static int
3343 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3344 const char *devname)
3345 {
3346 int rc = 0;
3347
3348 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3349 return -EINVAL;
3350
3351 if (volume_info->nullauth) {
3352 cifs_dbg(FYI, "Anonymous login\n");
3353 kfree(volume_info->username);
3354 volume_info->username = NULL;
3355 } else if (volume_info->username) {
3356 /* BB fixme parse for domain name here */
3357 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3358 } else {
3359 cifs_dbg(VFS, "No username specified\n");
3360 /* In userspace mount helper we can get user name from alternate
3361 locations such as env variables and files on disk */
3362 return -EINVAL;
3363 }
3364
3365 /* this is needed for ASCII cp to Unicode converts */
3366 if (volume_info->iocharset == NULL) {
3367 /* load_nls_default cannot return null */
3368 volume_info->local_nls = load_nls_default();
3369 } else {
3370 volume_info->local_nls = load_nls(volume_info->iocharset);
3371 if (volume_info->local_nls == NULL) {
3372 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3373 volume_info->iocharset);
3374 return -ELIBACC;
3375 }
3376 }
3377
3378 return rc;
3379 }
3380
3381 struct smb_vol *
3382 cifs_get_volume_info(char *mount_data, const char *devname)
3383 {
3384 int rc;
3385 struct smb_vol *volume_info;
3386
3387 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3388 if (!volume_info)
3389 return ERR_PTR(-ENOMEM);
3390
3391 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3392 if (rc) {
3393 cifs_cleanup_volume_info(volume_info);
3394 volume_info = ERR_PTR(rc);
3395 }
3396
3397 return volume_info;
3398 }
3399
3400 int
3401 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3402 {
3403 int rc;
3404 unsigned int xid;
3405 struct cifs_ses *ses;
3406 struct cifs_tcon *tcon;
3407 struct TCP_Server_Info *server;
3408 char *full_path;
3409 struct tcon_link *tlink;
3410 #ifdef CONFIG_CIFS_DFS_UPCALL
3411 int referral_walks_count = 0;
3412 #endif
3413
3414 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3415 if (rc)
3416 return rc;
3417
3418 #ifdef CONFIG_CIFS_DFS_UPCALL
3419 try_mount_again:
3420 /* cleanup activities if we're chasing a referral */
3421 if (referral_walks_count) {
3422 if (tcon)
3423 cifs_put_tcon(tcon);
3424 else if (ses)
3425 cifs_put_smb_ses(ses);
3426
3427 free_xid(xid);
3428 }
3429 #endif
3430 rc = 0;
3431 tcon = NULL;
3432 ses = NULL;
3433 server = NULL;
3434 full_path = NULL;
3435 tlink = NULL;
3436
3437 xid = get_xid();
3438
3439 /* get a reference to a tcp session */
3440 server = cifs_get_tcp_session(volume_info);
3441 if (IS_ERR(server)) {
3442 rc = PTR_ERR(server);
3443 bdi_destroy(&cifs_sb->bdi);
3444 goto out;
3445 }
3446
3447 /* get a reference to a SMB session */
3448 ses = cifs_get_smb_ses(server, volume_info);
3449 if (IS_ERR(ses)) {
3450 rc = PTR_ERR(ses);
3451 ses = NULL;
3452 goto mount_fail_check;
3453 }
3454
3455 /* search for existing tcon to this server share */
3456 tcon = cifs_get_tcon(ses, volume_info);
3457 if (IS_ERR(tcon)) {
3458 rc = PTR_ERR(tcon);
3459 tcon = NULL;
3460 goto remote_path_check;
3461 }
3462
3463 /* tell server which Unix caps we support */
3464 if (cap_unix(tcon->ses)) {
3465 /* reset of caps checks mount to see if unix extensions
3466 disabled for just this mount */
3467 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3468 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3469 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3470 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3471 rc = -EACCES;
3472 goto mount_fail_check;
3473 }
3474 } else
3475 tcon->unix_ext = 0; /* server does not support them */
3476
3477 /* do not care if a following call succeed - informational */
3478 if (!tcon->ipc && server->ops->qfs_tcon)
3479 server->ops->qfs_tcon(xid, tcon);
3480
3481 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3482 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3483
3484 /* tune readahead according to rsize */
3485 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3486
3487 remote_path_check:
3488 #ifdef CONFIG_CIFS_DFS_UPCALL
3489 /*
3490 * Perform an unconditional check for whether there are DFS
3491 * referrals for this path without prefix, to provide support
3492 * for DFS referrals from w2k8 servers which don't seem to respond
3493 * with PATH_NOT_COVERED to requests that include the prefix.
3494 * Chase the referral if found, otherwise continue normally.
3495 */
3496 if (referral_walks_count == 0) {
3497 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3498 false);
3499 if (!refrc) {
3500 referral_walks_count++;
3501 goto try_mount_again;
3502 }
3503 }
3504 #endif
3505
3506 /* check if a whole path is not remote */
3507 if (!rc && tcon) {
3508 if (!server->ops->is_path_accessible) {
3509 rc = -ENOSYS;
3510 goto mount_fail_check;
3511 }
3512 /*
3513 * cifs_build_path_to_root works only when we have a valid tcon
3514 */
3515 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3516 if (full_path == NULL) {
3517 rc = -ENOMEM;
3518 goto mount_fail_check;
3519 }
3520 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3521 full_path);
3522 if (rc != 0 && rc != -EREMOTE) {
3523 kfree(full_path);
3524 goto mount_fail_check;
3525 }
3526 kfree(full_path);
3527 }
3528
3529 /* get referral if needed */
3530 if (rc == -EREMOTE) {
3531 #ifdef CONFIG_CIFS_DFS_UPCALL
3532 if (referral_walks_count > MAX_NESTED_LINKS) {
3533 /*
3534 * BB: when we implement proper loop detection,
3535 * we will remove this check. But now we need it
3536 * to prevent an indefinite loop if 'DFS tree' is
3537 * misconfigured (i.e. has loops).
3538 */
3539 rc = -ELOOP;
3540 goto mount_fail_check;
3541 }
3542
3543 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3544
3545 if (!rc) {
3546 referral_walks_count++;
3547 goto try_mount_again;
3548 }
3549 goto mount_fail_check;
3550 #else /* No DFS support, return error on mount */
3551 rc = -EOPNOTSUPP;
3552 #endif
3553 }
3554
3555 if (rc)
3556 goto mount_fail_check;
3557
3558 /* now, hang the tcon off of the superblock */
3559 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3560 if (tlink == NULL) {
3561 rc = -ENOMEM;
3562 goto mount_fail_check;
3563 }
3564
3565 tlink->tl_uid = ses->linux_uid;
3566 tlink->tl_tcon = tcon;
3567 tlink->tl_time = jiffies;
3568 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3569 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3570
3571 cifs_sb->master_tlink = tlink;
3572 spin_lock(&cifs_sb->tlink_tree_lock);
3573 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3574 spin_unlock(&cifs_sb->tlink_tree_lock);
3575
3576 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3577 TLINK_IDLE_EXPIRE);
3578
3579 mount_fail_check:
3580 /* on error free sesinfo and tcon struct if needed */
3581 if (rc) {
3582 /* If find_unc succeeded then rc == 0 so we can not end */
3583 /* up accidentally freeing someone elses tcon struct */
3584 if (tcon)
3585 cifs_put_tcon(tcon);
3586 else if (ses)
3587 cifs_put_smb_ses(ses);
3588 else
3589 cifs_put_tcp_session(server);
3590 bdi_destroy(&cifs_sb->bdi);
3591 }
3592
3593 out:
3594 free_xid(xid);
3595 return rc;
3596 }
3597
3598 /*
3599 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3600 * pointer may be NULL.
3601 */
3602 int
3603 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3604 const char *tree, struct cifs_tcon *tcon,
3605 const struct nls_table *nls_codepage)
3606 {
3607 struct smb_hdr *smb_buffer;
3608 struct smb_hdr *smb_buffer_response;
3609 TCONX_REQ *pSMB;
3610 TCONX_RSP *pSMBr;
3611 unsigned char *bcc_ptr;
3612 int rc = 0;
3613 int length;
3614 __u16 bytes_left, count;
3615
3616 if (ses == NULL)
3617 return -EIO;
3618
3619 smb_buffer = cifs_buf_get();
3620 if (smb_buffer == NULL)
3621 return -ENOMEM;
3622
3623 smb_buffer_response = smb_buffer;
3624
3625 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3626 NULL /*no tid */ , 4 /*wct */ );
3627
3628 smb_buffer->Mid = get_next_mid(ses->server);
3629 smb_buffer->Uid = ses->Suid;
3630 pSMB = (TCONX_REQ *) smb_buffer;
3631 pSMBr = (TCONX_RSP *) smb_buffer_response;
3632
3633 pSMB->AndXCommand = 0xFF;
3634 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3635 bcc_ptr = &pSMB->Password[0];
3636 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3637 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3638 *bcc_ptr = 0; /* password is null byte */
3639 bcc_ptr++; /* skip password */
3640 /* already aligned so no need to do it below */
3641 } else {
3642 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3643 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3644 specified as required (when that support is added to
3645 the vfs in the future) as only NTLM or the much
3646 weaker LANMAN (which we do not send by default) is accepted
3647 by Samba (not sure whether other servers allow
3648 NTLMv2 password here) */
3649 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3650 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3651 (ses->sectype == LANMAN))
3652 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3653 ses->server->sec_mode &
3654 SECMODE_PW_ENCRYPT ? true : false,
3655 bcc_ptr);
3656 else
3657 #endif /* CIFS_WEAK_PW_HASH */
3658 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3659 bcc_ptr, nls_codepage);
3660
3661 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3662 if (ses->capabilities & CAP_UNICODE) {
3663 /* must align unicode strings */
3664 *bcc_ptr = 0; /* null byte password */
3665 bcc_ptr++;
3666 }
3667 }
3668
3669 if (ses->server->sign)
3670 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3671
3672 if (ses->capabilities & CAP_STATUS32) {
3673 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3674 }
3675 if (ses->capabilities & CAP_DFS) {
3676 smb_buffer->Flags2 |= SMBFLG2_DFS;
3677 }
3678 if (ses->capabilities & CAP_UNICODE) {
3679 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3680 length =
3681 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3682 6 /* max utf8 char length in bytes */ *
3683 (/* server len*/ + 256 /* share len */), nls_codepage);
3684 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3685 bcc_ptr += 2; /* skip trailing null */
3686 } else { /* ASCII */
3687 strcpy(bcc_ptr, tree);
3688 bcc_ptr += strlen(tree) + 1;
3689 }
3690 strcpy(bcc_ptr, "?????");
3691 bcc_ptr += strlen("?????");
3692 bcc_ptr += 1;
3693 count = bcc_ptr - &pSMB->Password[0];
3694 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3695 pSMB->hdr.smb_buf_length) + count);
3696 pSMB->ByteCount = cpu_to_le16(count);
3697
3698 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3699 0);
3700
3701 /* above now done in SendReceive */
3702 if ((rc == 0) && (tcon != NULL)) {
3703 bool is_unicode;
3704
3705 tcon->tidStatus = CifsGood;
3706 tcon->need_reconnect = false;
3707 tcon->tid = smb_buffer_response->Tid;
3708 bcc_ptr = pByteArea(smb_buffer_response);
3709 bytes_left = get_bcc(smb_buffer_response);
3710 length = strnlen(bcc_ptr, bytes_left - 2);
3711 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3712 is_unicode = true;
3713 else
3714 is_unicode = false;
3715
3716
3717 /* skip service field (NB: this field is always ASCII) */
3718 if (length == 3) {
3719 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3720 (bcc_ptr[2] == 'C')) {
3721 cifs_dbg(FYI, "IPC connection\n");
3722 tcon->ipc = 1;
3723 }
3724 } else if (length == 2) {
3725 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3726 /* the most common case */
3727 cifs_dbg(FYI, "disk share connection\n");
3728 }
3729 }
3730 bcc_ptr += length + 1;
3731 bytes_left -= (length + 1);
3732 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3733
3734 /* mostly informational -- no need to fail on error here */
3735 kfree(tcon->nativeFileSystem);
3736 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3737 bytes_left, is_unicode,
3738 nls_codepage);
3739
3740 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3741
3742 if ((smb_buffer_response->WordCount == 3) ||
3743 (smb_buffer_response->WordCount == 7))
3744 /* field is in same location */
3745 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3746 else
3747 tcon->Flags = 0;
3748 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3749 } else if ((rc == 0) && tcon == NULL) {
3750 /* all we need to save for IPC$ connection */
3751 ses->ipc_tid = smb_buffer_response->Tid;
3752 }
3753
3754 cifs_buf_release(smb_buffer);
3755 return rc;
3756 }
3757
3758 void
3759 cifs_umount(struct cifs_sb_info *cifs_sb)
3760 {
3761 struct rb_root *root = &cifs_sb->tlink_tree;
3762 struct rb_node *node;
3763 struct tcon_link *tlink;
3764
3765 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3766
3767 spin_lock(&cifs_sb->tlink_tree_lock);
3768 while ((node = rb_first(root))) {
3769 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3770 cifs_get_tlink(tlink);
3771 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3772 rb_erase(node, root);
3773
3774 spin_unlock(&cifs_sb->tlink_tree_lock);
3775 cifs_put_tlink(tlink);
3776 spin_lock(&cifs_sb->tlink_tree_lock);
3777 }
3778 spin_unlock(&cifs_sb->tlink_tree_lock);
3779
3780 bdi_destroy(&cifs_sb->bdi);
3781 kfree(cifs_sb->mountdata);
3782 unload_nls(cifs_sb->local_nls);
3783 kfree(cifs_sb);
3784 }
3785
3786 int
3787 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3788 {
3789 int rc = 0;
3790 struct TCP_Server_Info *server = ses->server;
3791
3792 if (!server->ops->need_neg || !server->ops->negotiate)
3793 return -ENOSYS;
3794
3795 /* only send once per connect */
3796 if (!server->ops->need_neg(server))
3797 return 0;
3798
3799 set_credits(server, 1);
3800
3801 rc = server->ops->negotiate(xid, ses);
3802 if (rc == 0) {
3803 spin_lock(&GlobalMid_Lock);
3804 if (server->tcpStatus == CifsNeedNegotiate)
3805 server->tcpStatus = CifsGood;
3806 else
3807 rc = -EHOSTDOWN;
3808 spin_unlock(&GlobalMid_Lock);
3809 }
3810
3811 return rc;
3812 }
3813
3814 int
3815 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3816 struct nls_table *nls_info)
3817 {
3818 int rc = -ENOSYS;
3819 struct TCP_Server_Info *server = ses->server;
3820
3821 ses->capabilities = server->capabilities;
3822 if (linuxExtEnabled == 0)
3823 ses->capabilities &= (~server->vals->cap_unix);
3824
3825 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3826 server->sec_mode, server->capabilities, server->timeAdj);
3827
3828 if (server->ops->sess_setup)
3829 rc = server->ops->sess_setup(xid, ses, nls_info);
3830
3831 if (rc) {
3832 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3833 } else {
3834 mutex_lock(&server->srv_mutex);
3835 if (!server->session_estab) {
3836 server->session_key.response = ses->auth_key.response;
3837 server->session_key.len = ses->auth_key.len;
3838 server->sequence_number = 0x2;
3839 server->session_estab = true;
3840 ses->auth_key.response = NULL;
3841 if (server->ops->generate_signingkey)
3842 server->ops->generate_signingkey(server);
3843 }
3844 mutex_unlock(&server->srv_mutex);
3845
3846 cifs_dbg(FYI, "CIFS Session Established successfully\n");
3847 spin_lock(&GlobalMid_Lock);
3848 ses->status = CifsGood;
3849 ses->need_reconnect = false;
3850 spin_unlock(&GlobalMid_Lock);
3851 }
3852
3853 kfree(ses->auth_key.response);
3854 ses->auth_key.response = NULL;
3855 ses->auth_key.len = 0;
3856 kfree(ses->ntlmssp);
3857 ses->ntlmssp = NULL;
3858
3859 return rc;
3860 }
3861
3862 static int
3863 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3864 {
3865 vol->sectype = ses->sectype;
3866
3867 /* krb5 is special, since we don't need username or pw */
3868 if (vol->sectype == Kerberos)
3869 return 0;
3870
3871 return cifs_set_cifscreds(vol, ses);
3872 }
3873
3874 static struct cifs_tcon *
3875 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3876 {
3877 int rc;
3878 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3879 struct cifs_ses *ses;
3880 struct cifs_tcon *tcon = NULL;
3881 struct smb_vol *vol_info;
3882
3883 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3884 if (vol_info == NULL)
3885 return ERR_PTR(-ENOMEM);
3886
3887 vol_info->local_nls = cifs_sb->local_nls;
3888 vol_info->linux_uid = fsuid;
3889 vol_info->cred_uid = fsuid;
3890 vol_info->UNC = master_tcon->treeName;
3891 vol_info->retry = master_tcon->retry;
3892 vol_info->nocase = master_tcon->nocase;
3893 vol_info->local_lease = master_tcon->local_lease;
3894 vol_info->no_linux_ext = !master_tcon->unix_ext;
3895 vol_info->sectype = master_tcon->ses->sectype;
3896 vol_info->sign = master_tcon->ses->sign;
3897
3898 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3899 if (rc) {
3900 tcon = ERR_PTR(rc);
3901 goto out;
3902 }
3903
3904 /* get a reference for the same TCP session */
3905 spin_lock(&cifs_tcp_ses_lock);
3906 ++master_tcon->ses->server->srv_count;
3907 spin_unlock(&cifs_tcp_ses_lock);
3908
3909 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3910 if (IS_ERR(ses)) {
3911 tcon = (struct cifs_tcon *)ses;
3912 cifs_put_tcp_session(master_tcon->ses->server);
3913 goto out;
3914 }
3915
3916 tcon = cifs_get_tcon(ses, vol_info);
3917 if (IS_ERR(tcon)) {
3918 cifs_put_smb_ses(ses);
3919 goto out;
3920 }
3921
3922 if (cap_unix(ses))
3923 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3924 out:
3925 kfree(vol_info->username);
3926 kfree(vol_info->password);
3927 kfree(vol_info);
3928
3929 return tcon;
3930 }
3931
3932 struct cifs_tcon *
3933 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3934 {
3935 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3936 }
3937
3938 static int
3939 cifs_sb_tcon_pending_wait(void *unused)
3940 {
3941 schedule();
3942 return signal_pending(current) ? -ERESTARTSYS : 0;
3943 }
3944
3945 /* find and return a tlink with given uid */
3946 static struct tcon_link *
3947 tlink_rb_search(struct rb_root *root, kuid_t uid)
3948 {
3949 struct rb_node *node = root->rb_node;
3950 struct tcon_link *tlink;
3951
3952 while (node) {
3953 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3954
3955 if (uid_gt(tlink->tl_uid, uid))
3956 node = node->rb_left;
3957 else if (uid_lt(tlink->tl_uid, uid))
3958 node = node->rb_right;
3959 else
3960 return tlink;
3961 }
3962 return NULL;
3963 }
3964
3965 /* insert a tcon_link into the tree */
3966 static void
3967 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3968 {
3969 struct rb_node **new = &(root->rb_node), *parent = NULL;
3970 struct tcon_link *tlink;
3971
3972 while (*new) {
3973 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3974 parent = *new;
3975
3976 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3977 new = &((*new)->rb_left);
3978 else
3979 new = &((*new)->rb_right);
3980 }
3981
3982 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3983 rb_insert_color(&new_tlink->tl_rbnode, root);
3984 }
3985
3986 /*
3987 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3988 * current task.
3989 *
3990 * If the superblock doesn't refer to a multiuser mount, then just return
3991 * the master tcon for the mount.
3992 *
3993 * First, search the rbtree for an existing tcon for this fsuid. If one
3994 * exists, then check to see if it's pending construction. If it is then wait
3995 * for construction to complete. Once it's no longer pending, check to see if
3996 * it failed and either return an error or retry construction, depending on
3997 * the timeout.
3998 *
3999 * If one doesn't exist then insert a new tcon_link struct into the tree and
4000 * try to construct a new one.
4001 */
4002 struct tcon_link *
4003 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4004 {
4005 int ret;
4006 kuid_t fsuid = current_fsuid();
4007 struct tcon_link *tlink, *newtlink;
4008
4009 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4010 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4011
4012 spin_lock(&cifs_sb->tlink_tree_lock);
4013 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4014 if (tlink)
4015 cifs_get_tlink(tlink);
4016 spin_unlock(&cifs_sb->tlink_tree_lock);
4017
4018 if (tlink == NULL) {
4019 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4020 if (newtlink == NULL)
4021 return ERR_PTR(-ENOMEM);
4022 newtlink->tl_uid = fsuid;
4023 newtlink->tl_tcon = ERR_PTR(-EACCES);
4024 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4025 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4026 cifs_get_tlink(newtlink);
4027
4028 spin_lock(&cifs_sb->tlink_tree_lock);
4029 /* was one inserted after previous search? */
4030 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4031 if (tlink) {
4032 cifs_get_tlink(tlink);
4033 spin_unlock(&cifs_sb->tlink_tree_lock);
4034 kfree(newtlink);
4035 goto wait_for_construction;
4036 }
4037 tlink = newtlink;
4038 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4039 spin_unlock(&cifs_sb->tlink_tree_lock);
4040 } else {
4041 wait_for_construction:
4042 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4043 cifs_sb_tcon_pending_wait,
4044 TASK_INTERRUPTIBLE);
4045 if (ret) {
4046 cifs_put_tlink(tlink);
4047 return ERR_PTR(ret);
4048 }
4049
4050 /* if it's good, return it */
4051 if (!IS_ERR(tlink->tl_tcon))
4052 return tlink;
4053
4054 /* return error if we tried this already recently */
4055 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4056 cifs_put_tlink(tlink);
4057 return ERR_PTR(-EACCES);
4058 }
4059
4060 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4061 goto wait_for_construction;
4062 }
4063
4064 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4065 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4066 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4067
4068 if (IS_ERR(tlink->tl_tcon)) {
4069 cifs_put_tlink(tlink);
4070 return ERR_PTR(-EACCES);
4071 }
4072
4073 return tlink;
4074 }
4075
4076 /*
4077 * periodic workqueue job that scans tcon_tree for a superblock and closes
4078 * out tcons.
4079 */
4080 static void
4081 cifs_prune_tlinks(struct work_struct *work)
4082 {
4083 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4084 prune_tlinks.work);
4085 struct rb_root *root = &cifs_sb->tlink_tree;
4086 struct rb_node *node = rb_first(root);
4087 struct rb_node *tmp;
4088 struct tcon_link *tlink;
4089
4090 /*
4091 * Because we drop the spinlock in the loop in order to put the tlink
4092 * it's not guarded against removal of links from the tree. The only
4093 * places that remove entries from the tree are this function and
4094 * umounts. Because this function is non-reentrant and is canceled
4095 * before umount can proceed, this is safe.
4096 */
4097 spin_lock(&cifs_sb->tlink_tree_lock);
4098 node = rb_first(root);
4099 while (node != NULL) {
4100 tmp = node;
4101 node = rb_next(tmp);
4102 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4103
4104 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4105 atomic_read(&tlink->tl_count) != 0 ||
4106 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4107 continue;
4108
4109 cifs_get_tlink(tlink);
4110 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4111 rb_erase(tmp, root);
4112
4113 spin_unlock(&cifs_sb->tlink_tree_lock);
4114 cifs_put_tlink(tlink);
4115 spin_lock(&cifs_sb->tlink_tree_lock);
4116 }
4117 spin_unlock(&cifs_sb->tlink_tree_lock);
4118
4119 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4120 TLINK_IDLE_EXPIRE);
4121 }
Linux kernel - Deliverables
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