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cifs: fix race between call_async() and reconnect()
[linux-2.6/btrfs-unstable.git] / fs / cifs / connect.c
blob4fbd92d2e113e69d5e3105235a215a52b2e756e7
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_mapposix, Opt_nomapposix,
74 Opt_mapchars, Opt_nomapchars, Opt_sfu,
75 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
76 Opt_noposixpaths, Opt_nounix,
77 Opt_nocase,
78 Opt_brl, Opt_nobrl,
79 Opt_forcemandatorylock, Opt_setuids,
80 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
81 Opt_nohard, Opt_nosoft,
82 Opt_nointr, Opt_intr,
83 Opt_nostrictsync, Opt_strictsync,
84 Opt_serverino, Opt_noserverino,
85 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
86 Opt_acl, Opt_noacl, Opt_locallease,
87 Opt_sign, Opt_seal, Opt_noac,
88 Opt_fsc, Opt_mfsymlinks,
89 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
90 Opt_persistent, Opt_nopersistent,
91 Opt_resilient, Opt_noresilient,
92
93 /* Mount options which take numeric value */
94 Opt_backupuid, Opt_backupgid, Opt_uid,
95 Opt_cruid, Opt_gid, Opt_file_mode,
96 Opt_dirmode, Opt_port,
97 Opt_rsize, Opt_wsize, Opt_actimeo,
98 Opt_echo_interval,
99
100 /* Mount options which take string value */
101 Opt_user, Opt_pass, Opt_ip,
102 Opt_domain, Opt_srcaddr, Opt_iocharset,
103 Opt_netbiosname, Opt_servern,
104 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
105
106 /* Mount options to be ignored */
107 Opt_ignore,
108
109 /* Options which could be blank */
110 Opt_blank_pass,
111 Opt_blank_user,
112 Opt_blank_ip,
113
114 Opt_err
115 };
116
117 static const match_table_t cifs_mount_option_tokens = {
118
119 { Opt_user_xattr, "user_xattr" },
120 { Opt_nouser_xattr, "nouser_xattr" },
121 { Opt_forceuid, "forceuid" },
122 { Opt_noforceuid, "noforceuid" },
123 { Opt_forcegid, "forcegid" },
124 { Opt_noforcegid, "noforcegid" },
125 { Opt_noblocksend, "noblocksend" },
126 { Opt_noautotune, "noautotune" },
127 { Opt_hard, "hard" },
128 { Opt_soft, "soft" },
129 { Opt_perm, "perm" },
130 { Opt_noperm, "noperm" },
131 { Opt_mapchars, "mapchars" }, /* SFU style */
132 { Opt_nomapchars, "nomapchars" },
133 { Opt_mapposix, "mapposix" }, /* SFM style */
134 { Opt_nomapposix, "nomapposix" },
135 { Opt_sfu, "sfu" },
136 { Opt_nosfu, "nosfu" },
137 { Opt_nodfs, "nodfs" },
138 { Opt_posixpaths, "posixpaths" },
139 { Opt_noposixpaths, "noposixpaths" },
140 { Opt_nounix, "nounix" },
141 { Opt_nounix, "nolinux" },
142 { Opt_nocase, "nocase" },
143 { Opt_nocase, "ignorecase" },
144 { Opt_brl, "brl" },
145 { Opt_nobrl, "nobrl" },
146 { Opt_nobrl, "nolock" },
147 { Opt_forcemandatorylock, "forcemandatorylock" },
148 { Opt_forcemandatorylock, "forcemand" },
149 { Opt_setuids, "setuids" },
150 { Opt_nosetuids, "nosetuids" },
151 { Opt_dynperm, "dynperm" },
152 { Opt_nodynperm, "nodynperm" },
153 { Opt_nohard, "nohard" },
154 { Opt_nosoft, "nosoft" },
155 { Opt_nointr, "nointr" },
156 { Opt_intr, "intr" },
157 { Opt_nostrictsync, "nostrictsync" },
158 { Opt_strictsync, "strictsync" },
159 { Opt_serverino, "serverino" },
160 { Opt_noserverino, "noserverino" },
161 { Opt_rwpidforward, "rwpidforward" },
162 { Opt_cifsacl, "cifsacl" },
163 { Opt_nocifsacl, "nocifsacl" },
164 { Opt_acl, "acl" },
165 { Opt_noacl, "noacl" },
166 { Opt_locallease, "locallease" },
167 { Opt_sign, "sign" },
168 { Opt_seal, "seal" },
169 { Opt_noac, "noac" },
170 { Opt_fsc, "fsc" },
171 { Opt_mfsymlinks, "mfsymlinks" },
172 { Opt_multiuser, "multiuser" },
173 { Opt_sloppy, "sloppy" },
174 { Opt_nosharesock, "nosharesock" },
175 { Opt_persistent, "persistenthandles"},
176 { Opt_nopersistent, "nopersistenthandles"},
177 { Opt_resilient, "resilienthandles"},
178 { Opt_noresilient, "noresilienthandles"},
179
180 { Opt_backupuid, "backupuid=%s" },
181 { Opt_backupgid, "backupgid=%s" },
182 { Opt_uid, "uid=%s" },
183 { Opt_cruid, "cruid=%s" },
184 { Opt_gid, "gid=%s" },
185 { Opt_file_mode, "file_mode=%s" },
186 { Opt_dirmode, "dirmode=%s" },
187 { Opt_dirmode, "dir_mode=%s" },
188 { Opt_port, "port=%s" },
189 { Opt_rsize, "rsize=%s" },
190 { Opt_wsize, "wsize=%s" },
191 { Opt_actimeo, "actimeo=%s" },
192 { Opt_echo_interval, "echo_interval=%s" },
193
194 { Opt_blank_user, "user=" },
195 { Opt_blank_user, "username=" },
196 { Opt_user, "user=%s" },
197 { Opt_user, "username=%s" },
198 { Opt_blank_pass, "pass=" },
199 { Opt_blank_pass, "password=" },
200 { Opt_pass, "pass=%s" },
201 { Opt_pass, "password=%s" },
202 { Opt_blank_ip, "ip=" },
203 { Opt_blank_ip, "addr=" },
204 { Opt_ip, "ip=%s" },
205 { Opt_ip, "addr=%s" },
206 { Opt_ignore, "unc=%s" },
207 { Opt_ignore, "target=%s" },
208 { Opt_ignore, "path=%s" },
209 { Opt_domain, "dom=%s" },
210 { Opt_domain, "domain=%s" },
211 { Opt_domain, "workgroup=%s" },
212 { Opt_srcaddr, "srcaddr=%s" },
213 { Opt_ignore, "prefixpath=%s" },
214 { Opt_iocharset, "iocharset=%s" },
215 { Opt_netbiosname, "netbiosname=%s" },
216 { Opt_servern, "servern=%s" },
217 { Opt_ver, "ver=%s" },
218 { Opt_vers, "vers=%s" },
219 { Opt_sec, "sec=%s" },
220 { Opt_cache, "cache=%s" },
221
222 { Opt_ignore, "cred" },
223 { Opt_ignore, "credentials" },
224 { Opt_ignore, "cred=%s" },
225 { Opt_ignore, "credentials=%s" },
226 { Opt_ignore, "guest" },
227 { Opt_ignore, "rw" },
228 { Opt_ignore, "ro" },
229 { Opt_ignore, "suid" },
230 { Opt_ignore, "nosuid" },
231 { Opt_ignore, "exec" },
232 { Opt_ignore, "noexec" },
233 { Opt_ignore, "nodev" },
234 { Opt_ignore, "noauto" },
235 { Opt_ignore, "dev" },
236 { Opt_ignore, "mand" },
237 { Opt_ignore, "nomand" },
238 { Opt_ignore, "_netdev" },
239
240 { Opt_err, NULL }
241 };
242
243 enum {
244 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
245 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
246 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
247 Opt_sec_ntlmv2i, Opt_sec_lanman,
248 Opt_sec_none,
249
250 Opt_sec_err
251 };
252
253 static const match_table_t cifs_secflavor_tokens = {
254 { Opt_sec_krb5, "krb5" },
255 { Opt_sec_krb5i, "krb5i" },
256 { Opt_sec_krb5p, "krb5p" },
257 { Opt_sec_ntlmsspi, "ntlmsspi" },
258 { Opt_sec_ntlmssp, "ntlmssp" },
259 { Opt_ntlm, "ntlm" },
260 { Opt_sec_ntlmi, "ntlmi" },
261 { Opt_sec_ntlmv2, "nontlm" },
262 { Opt_sec_ntlmv2, "ntlmv2" },
263 { Opt_sec_ntlmv2i, "ntlmv2i" },
264 { Opt_sec_lanman, "lanman" },
265 { Opt_sec_none, "none" },
266
267 { Opt_sec_err, NULL }
268 };
269
270 /* cache flavors */
271 enum {
272 Opt_cache_loose,
273 Opt_cache_strict,
274 Opt_cache_none,
275 Opt_cache_err
276 };
277
278 static const match_table_t cifs_cacheflavor_tokens = {
279 { Opt_cache_loose, "loose" },
280 { Opt_cache_strict, "strict" },
281 { Opt_cache_none, "none" },
282 { Opt_cache_err, NULL }
283 };
284
285 static const match_table_t cifs_smb_version_tokens = {
286 { Smb_1, SMB1_VERSION_STRING },
287 { Smb_20, SMB20_VERSION_STRING},
288 { Smb_21, SMB21_VERSION_STRING },
289 { Smb_30, SMB30_VERSION_STRING },
290 { Smb_302, SMB302_VERSION_STRING },
291 #ifdef CONFIG_CIFS_SMB311
292 { Smb_311, SMB311_VERSION_STRING },
293 { Smb_311, ALT_SMB311_VERSION_STRING },
294 #endif /* SMB311 */
295 { Smb_version_err, NULL }
296 };
297
298 static int ip_connect(struct TCP_Server_Info *server);
299 static int generic_ip_connect(struct TCP_Server_Info *server);
300 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
301 static void cifs_prune_tlinks(struct work_struct *work);
302 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
303 const char *devname);
304
305 /*
306 * cifs tcp session reconnection
307 *
308 * mark tcp session as reconnecting so temporarily locked
309 * mark all smb sessions as reconnecting for tcp session
310 * reconnect tcp session
311 * wake up waiters on reconnection? - (not needed currently)
312 */
313 int
314 cifs_reconnect(struct TCP_Server_Info *server)
315 {
316 int rc = 0;
317 struct list_head *tmp, *tmp2;
318 struct cifs_ses *ses;
319 struct cifs_tcon *tcon;
320 struct mid_q_entry *mid_entry;
321 struct list_head retry_list;
322
323 spin_lock(&GlobalMid_Lock);
324 if (server->tcpStatus == CifsExiting) {
325 /* the demux thread will exit normally
326 next time through the loop */
327 spin_unlock(&GlobalMid_Lock);
328 return rc;
329 } else
330 server->tcpStatus = CifsNeedReconnect;
331 spin_unlock(&GlobalMid_Lock);
332 server->maxBuf = 0;
333 #ifdef CONFIG_CIFS_SMB2
334 server->max_read = 0;
335 #endif
336
337 cifs_dbg(FYI, "Reconnecting tcp session\n");
338
339 /* before reconnecting the tcp session, mark the smb session (uid)
340 and the tid bad so they are not used until reconnected */
341 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
342 __func__);
343 spin_lock(&cifs_tcp_ses_lock);
344 list_for_each(tmp, &server->smb_ses_list) {
345 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
346 ses->need_reconnect = true;
347 ses->ipc_tid = 0;
348 list_for_each(tmp2, &ses->tcon_list) {
349 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
350 tcon->need_reconnect = true;
351 }
352 }
353 spin_unlock(&cifs_tcp_ses_lock);
354
355 /* do not want to be sending data on a socket we are freeing */
356 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
357 mutex_lock(&server->srv_mutex);
358 if (server->ssocket) {
359 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
360 server->ssocket->state, server->ssocket->flags);
361 kernel_sock_shutdown(server->ssocket, SHUT_WR);
362 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
363 server->ssocket->state, server->ssocket->flags);
364 sock_release(server->ssocket);
365 server->ssocket = NULL;
366 }
367 server->sequence_number = 0;
368 server->session_estab = false;
369 kfree(server->session_key.response);
370 server->session_key.response = NULL;
371 server->session_key.len = 0;
372 server->lstrp = jiffies;
373
374 /* mark submitted MIDs for retry and issue callback */
375 INIT_LIST_HEAD(&retry_list);
376 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
377 spin_lock(&GlobalMid_Lock);
378 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
379 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
380 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
381 mid_entry->mid_state = MID_RETRY_NEEDED;
382 list_move(&mid_entry->qhead, &retry_list);
383 }
384 spin_unlock(&GlobalMid_Lock);
385 mutex_unlock(&server->srv_mutex);
386
387 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
388 list_for_each_safe(tmp, tmp2, &retry_list) {
389 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
390 list_del_init(&mid_entry->qhead);
391 mid_entry->callback(mid_entry);
392 }
393
394 do {
395 try_to_freeze();
396
397 /* we should try only the port we connected to before */
398 mutex_lock(&server->srv_mutex);
399 rc = generic_ip_connect(server);
400 if (rc) {
401 cifs_dbg(FYI, "reconnect error %d\n", rc);
402 mutex_unlock(&server->srv_mutex);
403 msleep(3000);
404 } else {
405 atomic_inc(&tcpSesReconnectCount);
406 spin_lock(&GlobalMid_Lock);
407 if (server->tcpStatus != CifsExiting)
408 server->tcpStatus = CifsNeedNegotiate;
409 spin_unlock(&GlobalMid_Lock);
410 mutex_unlock(&server->srv_mutex);
411 }
412 } while (server->tcpStatus == CifsNeedReconnect);
413
414 return rc;
415 }
416
417 static void
418 cifs_echo_request(struct work_struct *work)
419 {
420 int rc;
421 struct TCP_Server_Info *server = container_of(work,
422 struct TCP_Server_Info, echo.work);
423 unsigned long echo_interval = server->echo_interval;
424
425 /*
426 * We cannot send an echo if it is disabled or until the
427 * NEGOTIATE_PROTOCOL request is done, which is indicated by
428 * server->ops->need_neg() == true. Also, no need to ping if
429 * we got a response recently.
430 */
431 if (!server->ops->need_neg || server->ops->need_neg(server) ||
432 (server->ops->can_echo && !server->ops->can_echo(server)) ||
433 time_before(jiffies, server->lstrp + echo_interval - HZ))
434 goto requeue_echo;
435
436 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
437 if (rc)
438 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
439 server->hostname);
440
441 requeue_echo:
442 queue_delayed_work(cifsiod_wq, &server->echo, echo_interval);
443 }
444
445 static bool
446 allocate_buffers(struct TCP_Server_Info *server)
447 {
448 if (!server->bigbuf) {
449 server->bigbuf = (char *)cifs_buf_get();
450 if (!server->bigbuf) {
451 cifs_dbg(VFS, "No memory for large SMB response\n");
452 msleep(3000);
453 /* retry will check if exiting */
454 return false;
455 }
456 } else if (server->large_buf) {
457 /* we are reusing a dirty large buf, clear its start */
458 memset(server->bigbuf, 0, HEADER_SIZE(server));
459 }
460
461 if (!server->smallbuf) {
462 server->smallbuf = (char *)cifs_small_buf_get();
463 if (!server->smallbuf) {
464 cifs_dbg(VFS, "No memory for SMB response\n");
465 msleep(1000);
466 /* retry will check if exiting */
467 return false;
468 }
469 /* beginning of smb buffer is cleared in our buf_get */
470 } else {
471 /* if existing small buf clear beginning */
472 memset(server->smallbuf, 0, HEADER_SIZE(server));
473 }
474
475 return true;
476 }
477
478 static bool
479 server_unresponsive(struct TCP_Server_Info *server)
480 {
481 /*
482 * We need to wait 2 echo intervals to make sure we handle such
483 * situations right:
484 * 1s client sends a normal SMB request
485 * 2s client gets a response
486 * 30s echo workqueue job pops, and decides we got a response recently
487 * and don't need to send another
488 * ...
489 * 65s kernel_recvmsg times out, and we see that we haven't gotten
490 * a response in >60s.
491 */
492 if (server->tcpStatus == CifsGood &&
493 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
494 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
495 server->hostname, (2 * server->echo_interval) / HZ);
496 cifs_reconnect(server);
497 wake_up(&server->response_q);
498 return true;
499 }
500
501 return false;
502 }
503
504 /*
505 * kvec_array_init - clone a kvec array, and advance into it
506 * @new: pointer to memory for cloned array
507 * @iov: pointer to original array
508 * @nr_segs: number of members in original array
509 * @bytes: number of bytes to advance into the cloned array
510 *
511 * This function will copy the array provided in iov to a section of memory
512 * and advance the specified number of bytes into the new array. It returns
513 * the number of segments in the new array. "new" must be at least as big as
514 * the original iov array.
515 */
516 static unsigned int
517 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
518 size_t bytes)
519 {
520 size_t base = 0;
521
522 while (bytes || !iov->iov_len) {
523 int copy = min(bytes, iov->iov_len);
524
525 bytes -= copy;
526 base += copy;
527 if (iov->iov_len == base) {
528 iov++;
529 nr_segs--;
530 base = 0;
531 }
532 }
533 memcpy(new, iov, sizeof(*iov) * nr_segs);
534 new->iov_base += base;
535 new->iov_len -= base;
536 return nr_segs;
537 }
538
539 static struct kvec *
540 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
541 {
542 struct kvec *new_iov;
543
544 if (server->iov && nr_segs <= server->nr_iov)
545 return server->iov;
546
547 /* not big enough -- allocate a new one and release the old */
548 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
549 if (new_iov) {
550 kfree(server->iov);
551 server->iov = new_iov;
552 server->nr_iov = nr_segs;
553 }
554 return new_iov;
555 }
556
557 int
558 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
559 unsigned int nr_segs, unsigned int to_read)
560 {
561 int length = 0;
562 int total_read;
563 unsigned int segs;
564 struct msghdr smb_msg;
565 struct kvec *iov;
566
567 iov = get_server_iovec(server, nr_segs);
568 if (!iov)
569 return -ENOMEM;
570
571 smb_msg.msg_control = NULL;
572 smb_msg.msg_controllen = 0;
573
574 for (total_read = 0; to_read; total_read += length, to_read -= length) {
575 try_to_freeze();
576
577 if (server_unresponsive(server)) {
578 total_read = -ECONNABORTED;
579 break;
580 }
581
582 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
583
584 length = kernel_recvmsg(server->ssocket, &smb_msg,
585 iov, segs, to_read, 0);
586
587 if (server->tcpStatus == CifsExiting) {
588 total_read = -ESHUTDOWN;
589 break;
590 } else if (server->tcpStatus == CifsNeedReconnect) {
591 cifs_reconnect(server);
592 total_read = -ECONNABORTED;
593 break;
594 } else if (length == -ERESTARTSYS ||
595 length == -EAGAIN ||
596 length == -EINTR) {
597 /*
598 * Minimum sleep to prevent looping, allowing socket
599 * to clear and app threads to set tcpStatus
600 * CifsNeedReconnect if server hung.
601 */
602 usleep_range(1000, 2000);
603 length = 0;
604 continue;
605 } else if (length <= 0) {
606 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
607 "got %d", to_read, length);
608 cifs_reconnect(server);
609 total_read = -ECONNABORTED;
610 break;
611 }
612 }
613 return total_read;
614 }
615
616 int
617 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
618 unsigned int to_read)
619 {
620 struct kvec iov;
621
622 iov.iov_base = buf;
623 iov.iov_len = to_read;
624
625 return cifs_readv_from_socket(server, &iov, 1, to_read);
626 }
627
628 static bool
629 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
630 {
631 /*
632 * The first byte big endian of the length field,
633 * is actually not part of the length but the type
634 * with the most common, zero, as regular data.
635 */
636 switch (type) {
637 case RFC1002_SESSION_MESSAGE:
638 /* Regular SMB response */
639 return true;
640 case RFC1002_SESSION_KEEP_ALIVE:
641 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
642 break;
643 case RFC1002_POSITIVE_SESSION_RESPONSE:
644 cifs_dbg(FYI, "RFC 1002 positive session response\n");
645 break;
646 case RFC1002_NEGATIVE_SESSION_RESPONSE:
647 /*
648 * We get this from Windows 98 instead of an error on
649 * SMB negprot response.
650 */
651 cifs_dbg(FYI, "RFC 1002 negative session response\n");
652 /* give server a second to clean up */
653 msleep(1000);
654 /*
655 * Always try 445 first on reconnect since we get NACK
656 * on some if we ever connected to port 139 (the NACK
657 * is since we do not begin with RFC1001 session
658 * initialize frame).
659 */
660 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
661 cifs_reconnect(server);
662 wake_up(&server->response_q);
663 break;
664 default:
665 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
666 cifs_reconnect(server);
667 }
668
669 return false;
670 }
671
672 void
673 dequeue_mid(struct mid_q_entry *mid, bool malformed)
674 {
675 #ifdef CONFIG_CIFS_STATS2
676 mid->when_received = jiffies;
677 #endif
678 spin_lock(&GlobalMid_Lock);
679 if (!malformed)
680 mid->mid_state = MID_RESPONSE_RECEIVED;
681 else
682 mid->mid_state = MID_RESPONSE_MALFORMED;
683 list_del_init(&mid->qhead);
684 spin_unlock(&GlobalMid_Lock);
685 }
686
687 static void
688 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
689 char *buf, int malformed)
690 {
691 if (server->ops->check_trans2 &&
692 server->ops->check_trans2(mid, server, buf, malformed))
693 return;
694 mid->resp_buf = buf;
695 mid->large_buf = server->large_buf;
696 /* Was previous buf put in mpx struct for multi-rsp? */
697 if (!mid->multiRsp) {
698 /* smb buffer will be freed by user thread */
699 if (server->large_buf)
700 server->bigbuf = NULL;
701 else
702 server->smallbuf = NULL;
703 }
704 dequeue_mid(mid, malformed);
705 }
706
707 static void clean_demultiplex_info(struct TCP_Server_Info *server)
708 {
709 int length;
710
711 /* take it off the list, if it's not already */
712 spin_lock(&cifs_tcp_ses_lock);
713 list_del_init(&server->tcp_ses_list);
714 spin_unlock(&cifs_tcp_ses_lock);
715
716 spin_lock(&GlobalMid_Lock);
717 server->tcpStatus = CifsExiting;
718 spin_unlock(&GlobalMid_Lock);
719 wake_up_all(&server->response_q);
720
721 /* check if we have blocked requests that need to free */
722 spin_lock(&server->req_lock);
723 if (server->credits <= 0)
724 server->credits = 1;
725 spin_unlock(&server->req_lock);
726 /*
727 * Although there should not be any requests blocked on this queue it
728 * can not hurt to be paranoid and try to wake up requests that may
729 * haven been blocked when more than 50 at time were on the wire to the
730 * same server - they now will see the session is in exit state and get
731 * out of SendReceive.
732 */
733 wake_up_all(&server->request_q);
734 /* give those requests time to exit */
735 msleep(125);
736
737 if (server->ssocket) {
738 sock_release(server->ssocket);
739 server->ssocket = NULL;
740 }
741
742 if (!list_empty(&server->pending_mid_q)) {
743 struct list_head dispose_list;
744 struct mid_q_entry *mid_entry;
745 struct list_head *tmp, *tmp2;
746
747 INIT_LIST_HEAD(&dispose_list);
748 spin_lock(&GlobalMid_Lock);
749 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
750 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
751 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
752 mid_entry->mid_state = MID_SHUTDOWN;
753 list_move(&mid_entry->qhead, &dispose_list);
754 }
755 spin_unlock(&GlobalMid_Lock);
756
757 /* now walk dispose list and issue callbacks */
758 list_for_each_safe(tmp, tmp2, &dispose_list) {
759 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
760 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
761 list_del_init(&mid_entry->qhead);
762 mid_entry->callback(mid_entry);
763 }
764 /* 1/8th of sec is more than enough time for them to exit */
765 msleep(125);
766 }
767
768 if (!list_empty(&server->pending_mid_q)) {
769 /*
770 * mpx threads have not exited yet give them at least the smb
771 * send timeout time for long ops.
772 *
773 * Due to delays on oplock break requests, we need to wait at
774 * least 45 seconds before giving up on a request getting a
775 * response and going ahead and killing cifsd.
776 */
777 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
778 msleep(46000);
779 /*
780 * If threads still have not exited they are probably never
781 * coming home not much else we can do but free the memory.
782 */
783 }
784
785 kfree(server->hostname);
786 kfree(server->iov);
787 kfree(server);
788
789 length = atomic_dec_return(&tcpSesAllocCount);
790 if (length > 0)
791 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
792 }
793
794 static int
795 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
796 {
797 int length;
798 char *buf = server->smallbuf;
799 unsigned int pdu_length = get_rfc1002_length(buf);
800
801 /* make sure this will fit in a large buffer */
802 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
803 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
804 cifs_reconnect(server);
805 wake_up(&server->response_q);
806 return -ECONNABORTED;
807 }
808
809 /* switch to large buffer if too big for a small one */
810 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
811 server->large_buf = true;
812 memcpy(server->bigbuf, buf, server->total_read);
813 buf = server->bigbuf;
814 }
815
816 /* now read the rest */
817 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
818 pdu_length - HEADER_SIZE(server) + 1 + 4);
819 if (length < 0)
820 return length;
821 server->total_read += length;
822
823 dump_smb(buf, server->total_read);
824
825 /*
826 * We know that we received enough to get to the MID as we
827 * checked the pdu_length earlier. Now check to see
828 * if the rest of the header is OK. We borrow the length
829 * var for the rest of the loop to avoid a new stack var.
830 *
831 * 48 bytes is enough to display the header and a little bit
832 * into the payload for debugging purposes.
833 */
834 length = server->ops->check_message(buf, server->total_read, server);
835 if (length != 0)
836 cifs_dump_mem("Bad SMB: ", buf,
837 min_t(unsigned int, server->total_read, 48));
838
839 if (server->ops->is_status_pending &&
840 server->ops->is_status_pending(buf, server, length))
841 return -1;
842
843 if (!mid)
844 return length;
845
846 handle_mid(mid, server, buf, length);
847 return 0;
848 }
849
850 static int
851 cifs_demultiplex_thread(void *p)
852 {
853 int length;
854 struct TCP_Server_Info *server = p;
855 unsigned int pdu_length;
856 char *buf = NULL;
857 struct task_struct *task_to_wake = NULL;
858 struct mid_q_entry *mid_entry;
859
860 current->flags |= PF_MEMALLOC;
861 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
862
863 length = atomic_inc_return(&tcpSesAllocCount);
864 if (length > 1)
865 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
866
867 set_freezable();
868 while (server->tcpStatus != CifsExiting) {
869 if (try_to_freeze())
870 continue;
871
872 if (!allocate_buffers(server))
873 continue;
874
875 server->large_buf = false;
876 buf = server->smallbuf;
877 pdu_length = 4; /* enough to get RFC1001 header */
878
879 length = cifs_read_from_socket(server, buf, pdu_length);
880 if (length < 0)
881 continue;
882 server->total_read = length;
883
884 /*
885 * The right amount was read from socket - 4 bytes,
886 * so we can now interpret the length field.
887 */
888 pdu_length = get_rfc1002_length(buf);
889
890 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
891 if (!is_smb_response(server, buf[0]))
892 continue;
893
894 /* make sure we have enough to get to the MID */
895 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
896 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
897 pdu_length);
898 cifs_reconnect(server);
899 wake_up(&server->response_q);
900 continue;
901 }
902
903 /* read down to the MID */
904 length = cifs_read_from_socket(server, buf + 4,
905 HEADER_SIZE(server) - 1 - 4);
906 if (length < 0)
907 continue;
908 server->total_read += length;
909
910 mid_entry = server->ops->find_mid(server, buf);
911
912 if (!mid_entry || !mid_entry->receive)
913 length = standard_receive3(server, mid_entry);
914 else
915 length = mid_entry->receive(server, mid_entry);
916
917 if (length < 0)
918 continue;
919
920 if (server->large_buf)
921 buf = server->bigbuf;
922
923 server->lstrp = jiffies;
924 if (mid_entry != NULL) {
925 if (!mid_entry->multiRsp || mid_entry->multiEnd)
926 mid_entry->callback(mid_entry);
927 } else if (!server->ops->is_oplock_break ||
928 !server->ops->is_oplock_break(buf, server)) {
929 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
930 atomic_read(&midCount));
931 cifs_dump_mem("Received Data is: ", buf,
932 HEADER_SIZE(server));
933 #ifdef CONFIG_CIFS_DEBUG2
934 if (server->ops->dump_detail)
935 server->ops->dump_detail(buf);
936 cifs_dump_mids(server);
937 #endif /* CIFS_DEBUG2 */
938
939 }
940 } /* end while !EXITING */
941
942 /* buffer usually freed in free_mid - need to free it here on exit */
943 cifs_buf_release(server->bigbuf);
944 if (server->smallbuf) /* no sense logging a debug message if NULL */
945 cifs_small_buf_release(server->smallbuf);
946
947 task_to_wake = xchg(&server->tsk, NULL);
948 clean_demultiplex_info(server);
949
950 /* if server->tsk was NULL then wait for a signal before exiting */
951 if (!task_to_wake) {
952 set_current_state(TASK_INTERRUPTIBLE);
953 while (!signal_pending(current)) {
954 schedule();
955 set_current_state(TASK_INTERRUPTIBLE);
956 }
957 set_current_state(TASK_RUNNING);
958 }
959
960 module_put_and_exit(0);
961 }
962
963 /* extract the host portion of the UNC string */
964 static char *
965 extract_hostname(const char *unc)
966 {
967 const char *src;
968 char *dst, *delim;
969 unsigned int len;
970
971 /* skip double chars at beginning of string */
972 /* BB: check validity of these bytes? */
973 src = unc + 2;
974
975 /* delimiter between hostname and sharename is always '\\' now */
976 delim = strchr(src, '\\');
977 if (!delim)
978 return ERR_PTR(-EINVAL);
979
980 len = delim - src;
981 dst = kmalloc((len + 1), GFP_KERNEL);
982 if (dst == NULL)
983 return ERR_PTR(-ENOMEM);
984
985 memcpy(dst, src, len);
986 dst[len] = '\0';
987
988 return dst;
989 }
990
991 static int get_option_ul(substring_t args[], unsigned long *option)
992 {
993 int rc;
994 char *string;
995
996 string = match_strdup(args);
997 if (string == NULL)
998 return -ENOMEM;
999 rc = kstrtoul(string, 0, option);
1000 kfree(string);
1001
1002 return rc;
1003 }
1004
1005 static int get_option_uid(substring_t args[], kuid_t *result)
1006 {
1007 unsigned long value;
1008 kuid_t uid;
1009 int rc;
1010
1011 rc = get_option_ul(args, &value);
1012 if (rc)
1013 return rc;
1014
1015 uid = make_kuid(current_user_ns(), value);
1016 if (!uid_valid(uid))
1017 return -EINVAL;
1018
1019 *result = uid;
1020 return 0;
1021 }
1022
1023 static int get_option_gid(substring_t args[], kgid_t *result)
1024 {
1025 unsigned long value;
1026 kgid_t gid;
1027 int rc;
1028
1029 rc = get_option_ul(args, &value);
1030 if (rc)
1031 return rc;
1032
1033 gid = make_kgid(current_user_ns(), value);
1034 if (!gid_valid(gid))
1035 return -EINVAL;
1036
1037 *result = gid;
1038 return 0;
1039 }
1040
1041 static int cifs_parse_security_flavors(char *value,
1042 struct smb_vol *vol)
1043 {
1044
1045 substring_t args[MAX_OPT_ARGS];
1046
1047 /*
1048 * With mount options, the last one should win. Reset any existing
1049 * settings back to default.
1050 */
1051 vol->sectype = Unspecified;
1052 vol->sign = false;
1053
1054 switch (match_token(value, cifs_secflavor_tokens, args)) {
1055 case Opt_sec_krb5p:
1056 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1057 return 1;
1058 case Opt_sec_krb5i:
1059 vol->sign = true;
1060 /* Fallthrough */
1061 case Opt_sec_krb5:
1062 vol->sectype = Kerberos;
1063 break;
1064 case Opt_sec_ntlmsspi:
1065 vol->sign = true;
1066 /* Fallthrough */
1067 case Opt_sec_ntlmssp:
1068 vol->sectype = RawNTLMSSP;
1069 break;
1070 case Opt_sec_ntlmi:
1071 vol->sign = true;
1072 /* Fallthrough */
1073 case Opt_ntlm:
1074 vol->sectype = NTLM;
1075 break;
1076 case Opt_sec_ntlmv2i:
1077 vol->sign = true;
1078 /* Fallthrough */
1079 case Opt_sec_ntlmv2:
1080 vol->sectype = NTLMv2;
1081 break;
1082 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1083 case Opt_sec_lanman:
1084 vol->sectype = LANMAN;
1085 break;
1086 #endif
1087 case Opt_sec_none:
1088 vol->nullauth = 1;
1089 break;
1090 default:
1091 cifs_dbg(VFS, "bad security option: %s\n", value);
1092 return 1;
1093 }
1094
1095 return 0;
1096 }
1097
1098 static int
1099 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1100 {
1101 substring_t args[MAX_OPT_ARGS];
1102
1103 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1104 case Opt_cache_loose:
1105 vol->direct_io = false;
1106 vol->strict_io = false;
1107 break;
1108 case Opt_cache_strict:
1109 vol->direct_io = false;
1110 vol->strict_io = true;
1111 break;
1112 case Opt_cache_none:
1113 vol->direct_io = true;
1114 vol->strict_io = false;
1115 break;
1116 default:
1117 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1118 return 1;
1119 }
1120 return 0;
1121 }
1122
1123 static int
1124 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1125 {
1126 substring_t args[MAX_OPT_ARGS];
1127
1128 switch (match_token(value, cifs_smb_version_tokens, args)) {
1129 case Smb_1:
1130 vol->ops = &smb1_operations;
1131 vol->vals = &smb1_values;
1132 break;
1133 #ifdef CONFIG_CIFS_SMB2
1134 case Smb_20:
1135 vol->ops = &smb20_operations;
1136 vol->vals = &smb20_values;
1137 break;
1138 case Smb_21:
1139 vol->ops = &smb21_operations;
1140 vol->vals = &smb21_values;
1141 break;
1142 case Smb_30:
1143 vol->ops = &smb30_operations;
1144 vol->vals = &smb30_values;
1145 break;
1146 case Smb_302:
1147 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1148 vol->vals = &smb302_values;
1149 break;
1150 #ifdef CONFIG_CIFS_SMB311
1151 case Smb_311:
1152 vol->ops = &smb311_operations;
1153 vol->vals = &smb311_values;
1154 break;
1155 #endif /* SMB311 */
1156 #endif
1157 default:
1158 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1159 return 1;
1160 }
1161 return 0;
1162 }
1163
1164 /*
1165 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1166 * fields with the result. Returns 0 on success and an error otherwise.
1167 */
1168 static int
1169 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1170 {
1171 char *pos;
1172 const char *delims = "/\\";
1173 size_t len;
1174
1175 /* make sure we have a valid UNC double delimiter prefix */
1176 len = strspn(devname, delims);
1177 if (len != 2)
1178 return -EINVAL;
1179
1180 /* find delimiter between host and sharename */
1181 pos = strpbrk(devname + 2, delims);
1182 if (!pos)
1183 return -EINVAL;
1184
1185 /* skip past delimiter */
1186 ++pos;
1187
1188 /* now go until next delimiter or end of string */
1189 len = strcspn(pos, delims);
1190
1191 /* move "pos" up to delimiter or NULL */
1192 pos += len;
1193 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1194 if (!vol->UNC)
1195 return -ENOMEM;
1196
1197 convert_delimiter(vol->UNC, '\\');
1198
1199 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1200 if (!*pos++ || !*pos)
1201 return 0;
1202
1203 vol->prepath = kstrdup(pos, GFP_KERNEL);
1204 if (!vol->prepath)
1205 return -ENOMEM;
1206
1207 return 0;
1208 }
1209
1210 static int
1211 cifs_parse_mount_options(const char *mountdata, const char *devname,
1212 struct smb_vol *vol)
1213 {
1214 char *data, *end;
1215 char *mountdata_copy = NULL, *options;
1216 unsigned int temp_len, i, j;
1217 char separator[2];
1218 short int override_uid = -1;
1219 short int override_gid = -1;
1220 bool uid_specified = false;
1221 bool gid_specified = false;
1222 bool sloppy = false;
1223 char *invalid = NULL;
1224 char *nodename = utsname()->nodename;
1225 char *string = NULL;
1226 char *tmp_end, *value;
1227 char delim;
1228 bool got_ip = false;
1229 unsigned short port = 0;
1230 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1231
1232 separator[0] = ',';
1233 separator[1] = 0;
1234 delim = separator[0];
1235
1236 /* ensure we always start with zeroed-out smb_vol */
1237 memset(vol, 0, sizeof(*vol));
1238
1239 /*
1240 * does not have to be perfect mapping since field is
1241 * informational, only used for servers that do not support
1242 * port 445 and it can be overridden at mount time
1243 */
1244 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1245 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1246 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1247
1248 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1249 /* null target name indicates to use *SMBSERVR default called name
1250 if we end up sending RFC1001 session initialize */
1251 vol->target_rfc1001_name[0] = 0;
1252 vol->cred_uid = current_uid();
1253 vol->linux_uid = current_uid();
1254 vol->linux_gid = current_gid();
1255
1256 /*
1257 * default to SFM style remapping of seven reserved characters
1258 * unless user overrides it or we negotiate CIFS POSIX where
1259 * it is unnecessary. Can not simultaneously use more than one mapping
1260 * since then readdir could list files that open could not open
1261 */
1262 vol->remap = true;
1263
1264 /* default to only allowing write access to owner of the mount */
1265 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1266
1267 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1268 /* default is always to request posix paths. */
1269 vol->posix_paths = 1;
1270 /* default to using server inode numbers where available */
1271 vol->server_ino = 1;
1272
1273 /* default is to use strict cifs caching semantics */
1274 vol->strict_io = true;
1275
1276 vol->actimeo = CIFS_DEF_ACTIMEO;
1277
1278 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1279 vol->ops = &smb1_operations;
1280 vol->vals = &smb1_values;
1281
1282 if (!mountdata)
1283 goto cifs_parse_mount_err;
1284
1285 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1286 if (!mountdata_copy)
1287 goto cifs_parse_mount_err;
1288
1289 options = mountdata_copy;
1290 end = options + strlen(options);
1291
1292 if (strncmp(options, "sep=", 4) == 0) {
1293 if (options[4] != 0) {
1294 separator[0] = options[4];
1295 options += 5;
1296 } else {
1297 cifs_dbg(FYI, "Null separator not allowed\n");
1298 }
1299 }
1300 vol->backupuid_specified = false; /* no backup intent for a user */
1301 vol->backupgid_specified = false; /* no backup intent for a group */
1302
1303 switch (cifs_parse_devname(devname, vol)) {
1304 case 0:
1305 break;
1306 case -ENOMEM:
1307 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1308 goto cifs_parse_mount_err;
1309 case -EINVAL:
1310 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1311 goto cifs_parse_mount_err;
1312 default:
1313 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1314 goto cifs_parse_mount_err;
1315 }
1316
1317 while ((data = strsep(&options, separator)) != NULL) {
1318 substring_t args[MAX_OPT_ARGS];
1319 unsigned long option;
1320 int token;
1321
1322 if (!*data)
1323 continue;
1324
1325 token = match_token(data, cifs_mount_option_tokens, args);
1326
1327 switch (token) {
1328
1329 /* Ingnore the following */
1330 case Opt_ignore:
1331 break;
1332
1333 /* Boolean values */
1334 case Opt_user_xattr:
1335 vol->no_xattr = 0;
1336 break;
1337 case Opt_nouser_xattr:
1338 vol->no_xattr = 1;
1339 break;
1340 case Opt_forceuid:
1341 override_uid = 1;
1342 break;
1343 case Opt_noforceuid:
1344 override_uid = 0;
1345 break;
1346 case Opt_forcegid:
1347 override_gid = 1;
1348 break;
1349 case Opt_noforcegid:
1350 override_gid = 0;
1351 break;
1352 case Opt_noblocksend:
1353 vol->noblocksnd = 1;
1354 break;
1355 case Opt_noautotune:
1356 vol->noautotune = 1;
1357 break;
1358 case Opt_hard:
1359 vol->retry = 1;
1360 break;
1361 case Opt_soft:
1362 vol->retry = 0;
1363 break;
1364 case Opt_perm:
1365 vol->noperm = 0;
1366 break;
1367 case Opt_noperm:
1368 vol->noperm = 1;
1369 break;
1370 case Opt_mapchars:
1371 vol->sfu_remap = true;
1372 vol->remap = false; /* disable SFM mapping */
1373 break;
1374 case Opt_nomapchars:
1375 vol->sfu_remap = false;
1376 break;
1377 case Opt_mapposix:
1378 vol->remap = true;
1379 vol->sfu_remap = false; /* disable SFU mapping */
1380 break;
1381 case Opt_nomapposix:
1382 vol->remap = false;
1383 break;
1384 case Opt_sfu:
1385 vol->sfu_emul = 1;
1386 break;
1387 case Opt_nosfu:
1388 vol->sfu_emul = 0;
1389 break;
1390 case Opt_nodfs:
1391 vol->nodfs = 1;
1392 break;
1393 case Opt_posixpaths:
1394 vol->posix_paths = 1;
1395 break;
1396 case Opt_noposixpaths:
1397 vol->posix_paths = 0;
1398 break;
1399 case Opt_nounix:
1400 vol->no_linux_ext = 1;
1401 break;
1402 case Opt_nocase:
1403 vol->nocase = 1;
1404 break;
1405 case Opt_brl:
1406 vol->nobrl = 0;
1407 break;
1408 case Opt_nobrl:
1409 vol->nobrl = 1;
1410 /*
1411 * turn off mandatory locking in mode
1412 * if remote locking is turned off since the
1413 * local vfs will do advisory
1414 */
1415 if (vol->file_mode ==
1416 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1417 vol->file_mode = S_IALLUGO;
1418 break;
1419 case Opt_forcemandatorylock:
1420 vol->mand_lock = 1;
1421 break;
1422 case Opt_setuids:
1423 vol->setuids = 1;
1424 break;
1425 case Opt_nosetuids:
1426 vol->setuids = 0;
1427 break;
1428 case Opt_dynperm:
1429 vol->dynperm = true;
1430 break;
1431 case Opt_nodynperm:
1432 vol->dynperm = false;
1433 break;
1434 case Opt_nohard:
1435 vol->retry = 0;
1436 break;
1437 case Opt_nosoft:
1438 vol->retry = 1;
1439 break;
1440 case Opt_nointr:
1441 vol->intr = 0;
1442 break;
1443 case Opt_intr:
1444 vol->intr = 1;
1445 break;
1446 case Opt_nostrictsync:
1447 vol->nostrictsync = 1;
1448 break;
1449 case Opt_strictsync:
1450 vol->nostrictsync = 0;
1451 break;
1452 case Opt_serverino:
1453 vol->server_ino = 1;
1454 break;
1455 case Opt_noserverino:
1456 vol->server_ino = 0;
1457 break;
1458 case Opt_rwpidforward:
1459 vol->rwpidforward = 1;
1460 break;
1461 case Opt_cifsacl:
1462 vol->cifs_acl = 1;
1463 break;
1464 case Opt_nocifsacl:
1465 vol->cifs_acl = 0;
1466 break;
1467 case Opt_acl:
1468 vol->no_psx_acl = 0;
1469 break;
1470 case Opt_noacl:
1471 vol->no_psx_acl = 1;
1472 break;
1473 case Opt_locallease:
1474 vol->local_lease = 1;
1475 break;
1476 case Opt_sign:
1477 vol->sign = true;
1478 break;
1479 case Opt_seal:
1480 /* we do not do the following in secFlags because seal
1481 * is a per tree connection (mount) not a per socket
1482 * or per-smb connection option in the protocol
1483 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1484 */
1485 vol->seal = 1;
1486 break;
1487 case Opt_noac:
1488 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1489 break;
1490 case Opt_fsc:
1491 #ifndef CONFIG_CIFS_FSCACHE
1492 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1493 goto cifs_parse_mount_err;
1494 #endif
1495 vol->fsc = true;
1496 break;
1497 case Opt_mfsymlinks:
1498 vol->mfsymlinks = true;
1499 break;
1500 case Opt_multiuser:
1501 vol->multiuser = true;
1502 break;
1503 case Opt_sloppy:
1504 sloppy = true;
1505 break;
1506 case Opt_nosharesock:
1507 vol->nosharesock = true;
1508 break;
1509 case Opt_nopersistent:
1510 vol->nopersistent = true;
1511 if (vol->persistent) {
1512 cifs_dbg(VFS,
1513 "persistenthandles mount options conflict\n");
1514 goto cifs_parse_mount_err;
1515 }
1516 break;
1517 case Opt_persistent:
1518 vol->persistent = true;
1519 if ((vol->nopersistent) || (vol->resilient)) {
1520 cifs_dbg(VFS,
1521 "persistenthandles mount options conflict\n");
1522 goto cifs_parse_mount_err;
1523 }
1524 break;
1525 case Opt_resilient:
1526 vol->resilient = true;
1527 if (vol->persistent) {
1528 cifs_dbg(VFS,
1529 "persistenthandles mount options conflict\n");
1530 goto cifs_parse_mount_err;
1531 }
1532 break;
1533 case Opt_noresilient:
1534 vol->resilient = false; /* already the default */
1535 break;
1536
1537 /* Numeric Values */
1538 case Opt_backupuid:
1539 if (get_option_uid(args, &vol->backupuid)) {
1540 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1541 __func__);
1542 goto cifs_parse_mount_err;
1543 }
1544 vol->backupuid_specified = true;
1545 break;
1546 case Opt_backupgid:
1547 if (get_option_gid(args, &vol->backupgid)) {
1548 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1549 __func__);
1550 goto cifs_parse_mount_err;
1551 }
1552 vol->backupgid_specified = true;
1553 break;
1554 case Opt_uid:
1555 if (get_option_uid(args, &vol->linux_uid)) {
1556 cifs_dbg(VFS, "%s: Invalid uid value\n",
1557 __func__);
1558 goto cifs_parse_mount_err;
1559 }
1560 uid_specified = true;
1561 break;
1562 case Opt_cruid:
1563 if (get_option_uid(args, &vol->cred_uid)) {
1564 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1565 __func__);
1566 goto cifs_parse_mount_err;
1567 }
1568 break;
1569 case Opt_gid:
1570 if (get_option_gid(args, &vol->linux_gid)) {
1571 cifs_dbg(VFS, "%s: Invalid gid value\n",
1572 __func__);
1573 goto cifs_parse_mount_err;
1574 }
1575 gid_specified = true;
1576 break;
1577 case Opt_file_mode:
1578 if (get_option_ul(args, &option)) {
1579 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1580 __func__);
1581 goto cifs_parse_mount_err;
1582 }
1583 vol->file_mode = option;
1584 break;
1585 case Opt_dirmode:
1586 if (get_option_ul(args, &option)) {
1587 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1588 __func__);
1589 goto cifs_parse_mount_err;
1590 }
1591 vol->dir_mode = option;
1592 break;
1593 case Opt_port:
1594 if (get_option_ul(args, &option) ||
1595 option > USHRT_MAX) {
1596 cifs_dbg(VFS, "%s: Invalid port value\n",
1597 __func__);
1598 goto cifs_parse_mount_err;
1599 }
1600 port = (unsigned short)option;
1601 break;
1602 case Opt_rsize:
1603 if (get_option_ul(args, &option)) {
1604 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1605 __func__);
1606 goto cifs_parse_mount_err;
1607 }
1608 vol->rsize = option;
1609 break;
1610 case Opt_wsize:
1611 if (get_option_ul(args, &option)) {
1612 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1613 __func__);
1614 goto cifs_parse_mount_err;
1615 }
1616 vol->wsize = option;
1617 break;
1618 case Opt_actimeo:
1619 if (get_option_ul(args, &option)) {
1620 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1621 __func__);
1622 goto cifs_parse_mount_err;
1623 }
1624 vol->actimeo = HZ * option;
1625 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1626 cifs_dbg(VFS, "attribute cache timeout too large\n");
1627 goto cifs_parse_mount_err;
1628 }
1629 break;
1630 case Opt_echo_interval:
1631 if (get_option_ul(args, &option)) {
1632 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1633 __func__);
1634 goto cifs_parse_mount_err;
1635 }
1636 vol->echo_interval = option;
1637 break;
1638
1639 /* String Arguments */
1640
1641 case Opt_blank_user:
1642 /* null user, ie. anonymous authentication */
1643 vol->nullauth = 1;
1644 vol->username = NULL;
1645 break;
1646 case Opt_user:
1647 string = match_strdup(args);
1648 if (string == NULL)
1649 goto out_nomem;
1650
1651 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1652 CIFS_MAX_USERNAME_LEN) {
1653 pr_warn("CIFS: username too long\n");
1654 goto cifs_parse_mount_err;
1655 }
1656
1657 kfree(vol->username);
1658 vol->username = kstrdup(string, GFP_KERNEL);
1659 if (!vol->username)
1660 goto cifs_parse_mount_err;
1661 break;
1662 case Opt_blank_pass:
1663 /* passwords have to be handled differently
1664 * to allow the character used for deliminator
1665 * to be passed within them
1666 */
1667
1668 /*
1669 * Check if this is a case where the password
1670 * starts with a delimiter
1671 */
1672 tmp_end = strchr(data, '=');
1673 tmp_end++;
1674 if (!(tmp_end < end && tmp_end[1] == delim)) {
1675 /* No it is not. Set the password to NULL */
1676 kfree(vol->password);
1677 vol->password = NULL;
1678 break;
1679 }
1680 /* Yes it is. Drop down to Opt_pass below.*/
1681 case Opt_pass:
1682 /* Obtain the value string */
1683 value = strchr(data, '=');
1684 value++;
1685
1686 /* Set tmp_end to end of the string */
1687 tmp_end = (char *) value + strlen(value);
1688
1689 /* Check if following character is the deliminator
1690 * If yes, we have encountered a double deliminator
1691 * reset the NULL character to the deliminator
1692 */
1693 if (tmp_end < end && tmp_end[1] == delim) {
1694 tmp_end[0] = delim;
1695
1696 /* Keep iterating until we get to a single
1697 * deliminator OR the end
1698 */
1699 while ((tmp_end = strchr(tmp_end, delim))
1700 != NULL && (tmp_end[1] == delim)) {
1701 tmp_end = (char *) &tmp_end[2];
1702 }
1703
1704 /* Reset var options to point to next element */
1705 if (tmp_end) {
1706 tmp_end[0] = '\0';
1707 options = (char *) &tmp_end[1];
1708 } else
1709 /* Reached the end of the mount option
1710 * string */
1711 options = end;
1712 }
1713
1714 kfree(vol->password);
1715 /* Now build new password string */
1716 temp_len = strlen(value);
1717 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1718 if (vol->password == NULL) {
1719 pr_warn("CIFS: no memory for password\n");
1720 goto cifs_parse_mount_err;
1721 }
1722
1723 for (i = 0, j = 0; i < temp_len; i++, j++) {
1724 vol->password[j] = value[i];
1725 if ((value[i] == delim) &&
1726 value[i+1] == delim)
1727 /* skip the second deliminator */
1728 i++;
1729 }
1730 vol->password[j] = '\0';
1731 break;
1732 case Opt_blank_ip:
1733 /* FIXME: should this be an error instead? */
1734 got_ip = false;
1735 break;
1736 case Opt_ip:
1737 string = match_strdup(args);
1738 if (string == NULL)
1739 goto out_nomem;
1740
1741 if (!cifs_convert_address(dstaddr, string,
1742 strlen(string))) {
1743 pr_err("CIFS: bad ip= option (%s).\n", string);
1744 goto cifs_parse_mount_err;
1745 }
1746 got_ip = true;
1747 break;
1748 case Opt_domain:
1749 string = match_strdup(args);
1750 if (string == NULL)
1751 goto out_nomem;
1752
1753 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1754 == CIFS_MAX_DOMAINNAME_LEN) {
1755 pr_warn("CIFS: domain name too long\n");
1756 goto cifs_parse_mount_err;
1757 }
1758
1759 kfree(vol->domainname);
1760 vol->domainname = kstrdup(string, GFP_KERNEL);
1761 if (!vol->domainname) {
1762 pr_warn("CIFS: no memory for domainname\n");
1763 goto cifs_parse_mount_err;
1764 }
1765 cifs_dbg(FYI, "Domain name set\n");
1766 break;
1767 case Opt_srcaddr:
1768 string = match_strdup(args);
1769 if (string == NULL)
1770 goto out_nomem;
1771
1772 if (!cifs_convert_address(
1773 (struct sockaddr *)&vol->srcaddr,
1774 string, strlen(string))) {
1775 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1776 string);
1777 goto cifs_parse_mount_err;
1778 }
1779 break;
1780 case Opt_iocharset:
1781 string = match_strdup(args);
1782 if (string == NULL)
1783 goto out_nomem;
1784
1785 if (strnlen(string, 1024) >= 65) {
1786 pr_warn("CIFS: iocharset name too long.\n");
1787 goto cifs_parse_mount_err;
1788 }
1789
1790 if (strncasecmp(string, "default", 7) != 0) {
1791 kfree(vol->iocharset);
1792 vol->iocharset = kstrdup(string,
1793 GFP_KERNEL);
1794 if (!vol->iocharset) {
1795 pr_warn("CIFS: no memory for charset\n");
1796 goto cifs_parse_mount_err;
1797 }
1798 }
1799 /* if iocharset not set then load_nls_default
1800 * is used by caller
1801 */
1802 cifs_dbg(FYI, "iocharset set to %s\n", string);
1803 break;
1804 case Opt_netbiosname:
1805 string = match_strdup(args);
1806 if (string == NULL)
1807 goto out_nomem;
1808
1809 memset(vol->source_rfc1001_name, 0x20,
1810 RFC1001_NAME_LEN);
1811 /*
1812 * FIXME: are there cases in which a comma can
1813 * be valid in workstation netbios name (and
1814 * need special handling)?
1815 */
1816 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1817 /* don't ucase netbiosname for user */
1818 if (string[i] == 0)
1819 break;
1820 vol->source_rfc1001_name[i] = string[i];
1821 }
1822 /* The string has 16th byte zero still from
1823 * set at top of the function
1824 */
1825 if (i == RFC1001_NAME_LEN && string[i] != 0)
1826 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1827 break;
1828 case Opt_servern:
1829 /* servernetbiosname specified override *SMBSERVER */
1830 string = match_strdup(args);
1831 if (string == NULL)
1832 goto out_nomem;
1833
1834 /* last byte, type, is 0x20 for servr type */
1835 memset(vol->target_rfc1001_name, 0x20,
1836 RFC1001_NAME_LEN_WITH_NULL);
1837
1838 /* BB are there cases in which a comma can be
1839 valid in this workstation netbios name
1840 (and need special handling)? */
1841
1842 /* user or mount helper must uppercase the
1843 netbios name */
1844 for (i = 0; i < 15; i++) {
1845 if (string[i] == 0)
1846 break;
1847 vol->target_rfc1001_name[i] = string[i];
1848 }
1849 /* The string has 16th byte zero still from
1850 set at top of the function */
1851 if (i == RFC1001_NAME_LEN && string[i] != 0)
1852 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1853 break;
1854 case Opt_ver:
1855 string = match_strdup(args);
1856 if (string == NULL)
1857 goto out_nomem;
1858
1859 if (strncasecmp(string, "1", 1) == 0) {
1860 /* This is the default */
1861 break;
1862 }
1863 /* For all other value, error */
1864 pr_warn("CIFS: Invalid version specified\n");
1865 goto cifs_parse_mount_err;
1866 case Opt_vers:
1867 string = match_strdup(args);
1868 if (string == NULL)
1869 goto out_nomem;
1870
1871 if (cifs_parse_smb_version(string, vol) != 0)
1872 goto cifs_parse_mount_err;
1873 break;
1874 case Opt_sec:
1875 string = match_strdup(args);
1876 if (string == NULL)
1877 goto out_nomem;
1878
1879 if (cifs_parse_security_flavors(string, vol) != 0)
1880 goto cifs_parse_mount_err;
1881 break;
1882 case Opt_cache:
1883 string = match_strdup(args);
1884 if (string == NULL)
1885 goto out_nomem;
1886
1887 if (cifs_parse_cache_flavor(string, vol) != 0)
1888 goto cifs_parse_mount_err;
1889 break;
1890 default:
1891 /*
1892 * An option we don't recognize. Save it off for later
1893 * if we haven't already found one
1894 */
1895 if (!invalid)
1896 invalid = data;
1897 break;
1898 }
1899 /* Free up any allocated string */
1900 kfree(string);
1901 string = NULL;
1902 }
1903
1904 if (!sloppy && invalid) {
1905 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1906 goto cifs_parse_mount_err;
1907 }
1908
1909 #ifndef CONFIG_KEYS
1910 /* Muliuser mounts require CONFIG_KEYS support */
1911 if (vol->multiuser) {
1912 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1913 goto cifs_parse_mount_err;
1914 }
1915 #endif
1916 if (!vol->UNC) {
1917 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1918 goto cifs_parse_mount_err;
1919 }
1920
1921 /* make sure UNC has a share name */
1922 if (!strchr(vol->UNC + 3, '\\')) {
1923 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1924 goto cifs_parse_mount_err;
1925 }
1926
1927 if (!got_ip) {
1928 /* No ip= option specified? Try to get it from UNC */
1929 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1930 strlen(&vol->UNC[2]))) {
1931 pr_err("Unable to determine destination address.\n");
1932 goto cifs_parse_mount_err;
1933 }
1934 }
1935
1936 /* set the port that we got earlier */
1937 cifs_set_port(dstaddr, port);
1938
1939 if (uid_specified)
1940 vol->override_uid = override_uid;
1941 else if (override_uid == 1)
1942 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1943
1944 if (gid_specified)
1945 vol->override_gid = override_gid;
1946 else if (override_gid == 1)
1947 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1948
1949 kfree(mountdata_copy);
1950 return 0;
1951
1952 out_nomem:
1953 pr_warn("Could not allocate temporary buffer\n");
1954 cifs_parse_mount_err:
1955 kfree(string);
1956 kfree(mountdata_copy);
1957 return 1;
1958 }
1959
1960 /** Returns true if srcaddr isn't specified and rhs isn't
1961 * specified, or if srcaddr is specified and
1962 * matches the IP address of the rhs argument.
1963 */
1964 static bool
1965 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1966 {
1967 switch (srcaddr->sa_family) {
1968 case AF_UNSPEC:
1969 return (rhs->sa_family == AF_UNSPEC);
1970 case AF_INET: {
1971 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1972 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1973 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1974 }
1975 case AF_INET6: {
1976 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1977 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1978 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1979 }
1980 default:
1981 WARN_ON(1);
1982 return false; /* don't expect to be here */
1983 }
1984 }
1985
1986 /*
1987 * If no port is specified in addr structure, we try to match with 445 port
1988 * and if it fails - with 139 ports. It should be called only if address
1989 * families of server and addr are equal.
1990 */
1991 static bool
1992 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1993 {
1994 __be16 port, *sport;
1995
1996 switch (addr->sa_family) {
1997 case AF_INET:
1998 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1999 port = ((struct sockaddr_in *) addr)->sin_port;
2000 break;
2001 case AF_INET6:
2002 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2003 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2004 break;
2005 default:
2006 WARN_ON(1);
2007 return false;
2008 }
2009
2010 if (!port) {
2011 port = htons(CIFS_PORT);
2012 if (port == *sport)
2013 return true;
2014
2015 port = htons(RFC1001_PORT);
2016 }
2017
2018 return port == *sport;
2019 }
2020
2021 static bool
2022 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2023 struct sockaddr *srcaddr)
2024 {
2025 switch (addr->sa_family) {
2026 case AF_INET: {
2027 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2028 struct sockaddr_in *srv_addr4 =
2029 (struct sockaddr_in *)&server->dstaddr;
2030
2031 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2032 return false;
2033 break;
2034 }
2035 case AF_INET6: {
2036 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2037 struct sockaddr_in6 *srv_addr6 =
2038 (struct sockaddr_in6 *)&server->dstaddr;
2039
2040 if (!ipv6_addr_equal(&addr6->sin6_addr,
2041 &srv_addr6->sin6_addr))
2042 return false;
2043 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2044 return false;
2045 break;
2046 }
2047 default:
2048 WARN_ON(1);
2049 return false; /* don't expect to be here */
2050 }
2051
2052 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2053 return false;
2054
2055 return true;
2056 }
2057
2058 static bool
2059 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2060 {
2061 /*
2062 * The select_sectype function should either return the vol->sectype
2063 * that was specified, or "Unspecified" if that sectype was not
2064 * compatible with the given NEGOTIATE request.
2065 */
2066 if (select_sectype(server, vol->sectype) == Unspecified)
2067 return false;
2068
2069 /*
2070 * Now check if signing mode is acceptable. No need to check
2071 * global_secflags at this point since if MUST_SIGN is set then
2072 * the server->sign had better be too.
2073 */
2074 if (vol->sign && !server->sign)
2075 return false;
2076
2077 return true;
2078 }
2079
2080 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2081 {
2082 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2083
2084 if (vol->nosharesock)
2085 return 0;
2086
2087 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2088 return 0;
2089
2090 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2091 return 0;
2092
2093 if (!match_address(server, addr,
2094 (struct sockaddr *)&vol->srcaddr))
2095 return 0;
2096
2097 if (!match_port(server, addr))
2098 return 0;
2099
2100 if (!match_security(server, vol))
2101 return 0;
2102
2103 if (server->echo_interval != vol->echo_interval)
2104 return 0;
2105
2106 return 1;
2107 }
2108
2109 static struct TCP_Server_Info *
2110 cifs_find_tcp_session(struct smb_vol *vol)
2111 {
2112 struct TCP_Server_Info *server;
2113
2114 spin_lock(&cifs_tcp_ses_lock);
2115 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2116 if (!match_server(server, vol))
2117 continue;
2118
2119 ++server->srv_count;
2120 spin_unlock(&cifs_tcp_ses_lock);
2121 cifs_dbg(FYI, "Existing tcp session with server found\n");
2122 return server;
2123 }
2124 spin_unlock(&cifs_tcp_ses_lock);
2125 return NULL;
2126 }
2127
2128 static void
2129 cifs_put_tcp_session(struct TCP_Server_Info *server)
2130 {
2131 struct task_struct *task;
2132
2133 spin_lock(&cifs_tcp_ses_lock);
2134 if (--server->srv_count > 0) {
2135 spin_unlock(&cifs_tcp_ses_lock);
2136 return;
2137 }
2138
2139 put_net(cifs_net_ns(server));
2140
2141 list_del_init(&server->tcp_ses_list);
2142 spin_unlock(&cifs_tcp_ses_lock);
2143
2144 cancel_delayed_work_sync(&server->echo);
2145
2146 spin_lock(&GlobalMid_Lock);
2147 server->tcpStatus = CifsExiting;
2148 spin_unlock(&GlobalMid_Lock);
2149
2150 cifs_crypto_shash_release(server);
2151 cifs_fscache_release_client_cookie(server);
2152
2153 kfree(server->session_key.response);
2154 server->session_key.response = NULL;
2155 server->session_key.len = 0;
2156
2157 task = xchg(&server->tsk, NULL);
2158 if (task)
2159 force_sig(SIGKILL, task);
2160 }
2161
2162 static struct TCP_Server_Info *
2163 cifs_get_tcp_session(struct smb_vol *volume_info)
2164 {
2165 struct TCP_Server_Info *tcp_ses = NULL;
2166 int rc;
2167
2168 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2169
2170 /* see if we already have a matching tcp_ses */
2171 tcp_ses = cifs_find_tcp_session(volume_info);
2172 if (tcp_ses)
2173 return tcp_ses;
2174
2175 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2176 if (!tcp_ses) {
2177 rc = -ENOMEM;
2178 goto out_err;
2179 }
2180
2181 tcp_ses->ops = volume_info->ops;
2182 tcp_ses->vals = volume_info->vals;
2183 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2184 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2185 if (IS_ERR(tcp_ses->hostname)) {
2186 rc = PTR_ERR(tcp_ses->hostname);
2187 goto out_err_crypto_release;
2188 }
2189
2190 tcp_ses->noblocksnd = volume_info->noblocksnd;
2191 tcp_ses->noautotune = volume_info->noautotune;
2192 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2193 tcp_ses->in_flight = 0;
2194 tcp_ses->credits = 1;
2195 init_waitqueue_head(&tcp_ses->response_q);
2196 init_waitqueue_head(&tcp_ses->request_q);
2197 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2198 mutex_init(&tcp_ses->srv_mutex);
2199 memcpy(tcp_ses->workstation_RFC1001_name,
2200 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2201 memcpy(tcp_ses->server_RFC1001_name,
2202 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2203 tcp_ses->session_estab = false;
2204 tcp_ses->sequence_number = 0;
2205 tcp_ses->lstrp = jiffies;
2206 spin_lock_init(&tcp_ses->req_lock);
2207 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2208 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2209 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2210 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2211 sizeof(tcp_ses->srcaddr));
2212 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2213 sizeof(tcp_ses->dstaddr));
2214 #ifdef CONFIG_CIFS_SMB2
2215 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2216 #endif
2217 /*
2218 * at this point we are the only ones with the pointer
2219 * to the struct since the kernel thread not created yet
2220 * no need to spinlock this init of tcpStatus or srv_count
2221 */
2222 tcp_ses->tcpStatus = CifsNew;
2223 ++tcp_ses->srv_count;
2224
2225 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2226 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2227 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2228 else
2229 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2230
2231 rc = ip_connect(tcp_ses);
2232 if (rc < 0) {
2233 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2234 goto out_err_crypto_release;
2235 }
2236
2237 /*
2238 * since we're in a cifs function already, we know that
2239 * this will succeed. No need for try_module_get().
2240 */
2241 __module_get(THIS_MODULE);
2242 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2243 tcp_ses, "cifsd");
2244 if (IS_ERR(tcp_ses->tsk)) {
2245 rc = PTR_ERR(tcp_ses->tsk);
2246 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2247 module_put(THIS_MODULE);
2248 goto out_err_crypto_release;
2249 }
2250 tcp_ses->tcpStatus = CifsNeedNegotiate;
2251
2252 /* thread spawned, put it on the list */
2253 spin_lock(&cifs_tcp_ses_lock);
2254 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2255 spin_unlock(&cifs_tcp_ses_lock);
2256
2257 cifs_fscache_get_client_cookie(tcp_ses);
2258
2259 /* queue echo request delayed work */
2260 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2261
2262 return tcp_ses;
2263
2264 out_err_crypto_release:
2265 cifs_crypto_shash_release(tcp_ses);
2266
2267 put_net(cifs_net_ns(tcp_ses));
2268
2269 out_err:
2270 if (tcp_ses) {
2271 if (!IS_ERR(tcp_ses->hostname))
2272 kfree(tcp_ses->hostname);
2273 if (tcp_ses->ssocket)
2274 sock_release(tcp_ses->ssocket);
2275 kfree(tcp_ses);
2276 }
2277 return ERR_PTR(rc);
2278 }
2279
2280 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2281 {
2282 if (vol->sectype != Unspecified &&
2283 vol->sectype != ses->sectype)
2284 return 0;
2285
2286 switch (ses->sectype) {
2287 case Kerberos:
2288 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2289 return 0;
2290 break;
2291 default:
2292 /* NULL username means anonymous session */
2293 if (ses->user_name == NULL) {
2294 if (!vol->nullauth)
2295 return 0;
2296 break;
2297 }
2298
2299 /* anything else takes username/password */
2300 if (strncmp(ses->user_name,
2301 vol->username ? vol->username : "",
2302 CIFS_MAX_USERNAME_LEN))
2303 return 0;
2304 if ((vol->username && strlen(vol->username) != 0) &&
2305 ses->password != NULL &&
2306 strncmp(ses->password,
2307 vol->password ? vol->password : "",
2308 CIFS_MAX_PASSWORD_LEN))
2309 return 0;
2310 }
2311 return 1;
2312 }
2313
2314 static struct cifs_ses *
2315 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2316 {
2317 struct cifs_ses *ses;
2318
2319 spin_lock(&cifs_tcp_ses_lock);
2320 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2321 if (ses->status == CifsExiting)
2322 continue;
2323 if (!match_session(ses, vol))
2324 continue;
2325 ++ses->ses_count;
2326 spin_unlock(&cifs_tcp_ses_lock);
2327 return ses;
2328 }
2329 spin_unlock(&cifs_tcp_ses_lock);
2330 return NULL;
2331 }
2332
2333 static void
2334 cifs_put_smb_ses(struct cifs_ses *ses)
2335 {
2336 unsigned int rc, xid;
2337 struct TCP_Server_Info *server = ses->server;
2338
2339 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2340
2341 spin_lock(&cifs_tcp_ses_lock);
2342 if (ses->status == CifsExiting) {
2343 spin_unlock(&cifs_tcp_ses_lock);
2344 return;
2345 }
2346 if (--ses->ses_count > 0) {
2347 spin_unlock(&cifs_tcp_ses_lock);
2348 return;
2349 }
2350 if (ses->status == CifsGood)
2351 ses->status = CifsExiting;
2352 spin_unlock(&cifs_tcp_ses_lock);
2353
2354 if (ses->status == CifsExiting && server->ops->logoff) {
2355 xid = get_xid();
2356 rc = server->ops->logoff(xid, ses);
2357 if (rc)
2358 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2359 __func__, rc);
2360 _free_xid(xid);
2361 }
2362
2363 spin_lock(&cifs_tcp_ses_lock);
2364 list_del_init(&ses->smb_ses_list);
2365 spin_unlock(&cifs_tcp_ses_lock);
2366
2367 sesInfoFree(ses);
2368 cifs_put_tcp_session(server);
2369 }
2370
2371 #ifdef CONFIG_KEYS
2372
2373 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2374 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2375
2376 /* Populate username and pw fields from keyring if possible */
2377 static int
2378 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2379 {
2380 int rc = 0;
2381 const char *delim, *payload;
2382 char *desc;
2383 ssize_t len;
2384 struct key *key;
2385 struct TCP_Server_Info *server = ses->server;
2386 struct sockaddr_in *sa;
2387 struct sockaddr_in6 *sa6;
2388 const struct user_key_payload *upayload;
2389
2390 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2391 if (!desc)
2392 return -ENOMEM;
2393
2394 /* try to find an address key first */
2395 switch (server->dstaddr.ss_family) {
2396 case AF_INET:
2397 sa = (struct sockaddr_in *)&server->dstaddr;
2398 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2399 break;
2400 case AF_INET6:
2401 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2402 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2403 break;
2404 default:
2405 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2406 server->dstaddr.ss_family);
2407 rc = -EINVAL;
2408 goto out_err;
2409 }
2410
2411 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2412 key = request_key(&key_type_logon, desc, "");
2413 if (IS_ERR(key)) {
2414 if (!ses->domainName) {
2415 cifs_dbg(FYI, "domainName is NULL\n");
2416 rc = PTR_ERR(key);
2417 goto out_err;
2418 }
2419
2420 /* didn't work, try to find a domain key */
2421 sprintf(desc, "cifs:d:%s", ses->domainName);
2422 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2423 key = request_key(&key_type_logon, desc, "");
2424 if (IS_ERR(key)) {
2425 rc = PTR_ERR(key);
2426 goto out_err;
2427 }
2428 }
2429
2430 down_read(&key->sem);
2431 upayload = user_key_payload(key);
2432 if (IS_ERR_OR_NULL(upayload)) {
2433 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2434 goto out_key_put;
2435 }
2436
2437 /* find first : in payload */
2438 payload = upayload->data;
2439 delim = strnchr(payload, upayload->datalen, ':');
2440 cifs_dbg(FYI, "payload=%s\n", payload);
2441 if (!delim) {
2442 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2443 upayload->datalen);
2444 rc = -EINVAL;
2445 goto out_key_put;
2446 }
2447
2448 len = delim - payload;
2449 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2450 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2451 len);
2452 rc = -EINVAL;
2453 goto out_key_put;
2454 }
2455
2456 vol->username = kstrndup(payload, len, GFP_KERNEL);
2457 if (!vol->username) {
2458 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2459 len);
2460 rc = -ENOMEM;
2461 goto out_key_put;
2462 }
2463 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2464
2465 len = key->datalen - (len + 1);
2466 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2467 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2468 rc = -EINVAL;
2469 kfree(vol->username);
2470 vol->username = NULL;
2471 goto out_key_put;
2472 }
2473
2474 ++delim;
2475 vol->password = kstrndup(delim, len, GFP_KERNEL);
2476 if (!vol->password) {
2477 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2478 len);
2479 rc = -ENOMEM;
2480 kfree(vol->username);
2481 vol->username = NULL;
2482 goto out_key_put;
2483 }
2484
2485 out_key_put:
2486 up_read(&key->sem);
2487 key_put(key);
2488 out_err:
2489 kfree(desc);
2490 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2491 return rc;
2492 }
2493 #else /* ! CONFIG_KEYS */
2494 static inline int
2495 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2496 struct cifs_ses *ses __attribute__((unused)))
2497 {
2498 return -ENOSYS;
2499 }
2500 #endif /* CONFIG_KEYS */
2501
2502 static struct cifs_ses *
2503 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2504 {
2505 int rc = -ENOMEM;
2506 unsigned int xid;
2507 struct cifs_ses *ses;
2508 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2509 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2510
2511 xid = get_xid();
2512
2513 ses = cifs_find_smb_ses(server, volume_info);
2514 if (ses) {
2515 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2516 ses->status);
2517
2518 mutex_lock(&ses->session_mutex);
2519 rc = cifs_negotiate_protocol(xid, ses);
2520 if (rc) {
2521 mutex_unlock(&ses->session_mutex);
2522 /* problem -- put our ses reference */
2523 cifs_put_smb_ses(ses);
2524 free_xid(xid);
2525 return ERR_PTR(rc);
2526 }
2527 if (ses->need_reconnect) {
2528 cifs_dbg(FYI, "Session needs reconnect\n");
2529 rc = cifs_setup_session(xid, ses,
2530 volume_info->local_nls);
2531 if (rc) {
2532 mutex_unlock(&ses->session_mutex);
2533 /* problem -- put our reference */
2534 cifs_put_smb_ses(ses);
2535 free_xid(xid);
2536 return ERR_PTR(rc);
2537 }
2538 }
2539 mutex_unlock(&ses->session_mutex);
2540
2541 /* existing SMB ses has a server reference already */
2542 cifs_put_tcp_session(server);
2543 free_xid(xid);
2544 return ses;
2545 }
2546
2547 cifs_dbg(FYI, "Existing smb sess not found\n");
2548 ses = sesInfoAlloc();
2549 if (ses == NULL)
2550 goto get_ses_fail;
2551
2552 /* new SMB session uses our server ref */
2553 ses->server = server;
2554 if (server->dstaddr.ss_family == AF_INET6)
2555 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2556 else
2557 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2558
2559 if (volume_info->username) {
2560 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2561 if (!ses->user_name)
2562 goto get_ses_fail;
2563 }
2564
2565 /* volume_info->password freed at unmount */
2566 if (volume_info->password) {
2567 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2568 if (!ses->password)
2569 goto get_ses_fail;
2570 }
2571 if (volume_info->domainname) {
2572 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2573 if (!ses->domainName)
2574 goto get_ses_fail;
2575 }
2576 ses->cred_uid = volume_info->cred_uid;
2577 ses->linux_uid = volume_info->linux_uid;
2578
2579 ses->sectype = volume_info->sectype;
2580 ses->sign = volume_info->sign;
2581
2582 mutex_lock(&ses->session_mutex);
2583 rc = cifs_negotiate_protocol(xid, ses);
2584 if (!rc)
2585 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2586 mutex_unlock(&ses->session_mutex);
2587 if (rc)
2588 goto get_ses_fail;
2589
2590 /* success, put it on the list */
2591 spin_lock(&cifs_tcp_ses_lock);
2592 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2593 spin_unlock(&cifs_tcp_ses_lock);
2594
2595 free_xid(xid);
2596 return ses;
2597
2598 get_ses_fail:
2599 sesInfoFree(ses);
2600 free_xid(xid);
2601 return ERR_PTR(rc);
2602 }
2603
2604 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2605 {
2606 if (tcon->tidStatus == CifsExiting)
2607 return 0;
2608 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2609 return 0;
2610 return 1;
2611 }
2612
2613 static struct cifs_tcon *
2614 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2615 {
2616 struct list_head *tmp;
2617 struct cifs_tcon *tcon;
2618
2619 spin_lock(&cifs_tcp_ses_lock);
2620 list_for_each(tmp, &ses->tcon_list) {
2621 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2622 if (!match_tcon(tcon, unc))
2623 continue;
2624 ++tcon->tc_count;
2625 spin_unlock(&cifs_tcp_ses_lock);
2626 return tcon;
2627 }
2628 spin_unlock(&cifs_tcp_ses_lock);
2629 return NULL;
2630 }
2631
2632 static void
2633 cifs_put_tcon(struct cifs_tcon *tcon)
2634 {
2635 unsigned int xid;
2636 struct cifs_ses *ses = tcon->ses;
2637
2638 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2639 spin_lock(&cifs_tcp_ses_lock);
2640 if (--tcon->tc_count > 0) {
2641 spin_unlock(&cifs_tcp_ses_lock);
2642 return;
2643 }
2644
2645 list_del_init(&tcon->tcon_list);
2646 spin_unlock(&cifs_tcp_ses_lock);
2647
2648 xid = get_xid();
2649 if (ses->server->ops->tree_disconnect)
2650 ses->server->ops->tree_disconnect(xid, tcon);
2651 _free_xid(xid);
2652
2653 cifs_fscache_release_super_cookie(tcon);
2654 tconInfoFree(tcon);
2655 cifs_put_smb_ses(ses);
2656 }
2657
2658 static struct cifs_tcon *
2659 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2660 {
2661 int rc, xid;
2662 struct cifs_tcon *tcon;
2663
2664 tcon = cifs_find_tcon(ses, volume_info->UNC);
2665 if (tcon) {
2666 cifs_dbg(FYI, "Found match on UNC path\n");
2667 /* existing tcon already has a reference */
2668 cifs_put_smb_ses(ses);
2669 if (tcon->seal != volume_info->seal)
2670 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2671 return tcon;
2672 }
2673
2674 if (!ses->server->ops->tree_connect) {
2675 rc = -ENOSYS;
2676 goto out_fail;
2677 }
2678
2679 tcon = tconInfoAlloc();
2680 if (tcon == NULL) {
2681 rc = -ENOMEM;
2682 goto out_fail;
2683 }
2684
2685 tcon->ses = ses;
2686 if (volume_info->password) {
2687 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2688 if (!tcon->password) {
2689 rc = -ENOMEM;
2690 goto out_fail;
2691 }
2692 }
2693
2694 /*
2695 * BB Do we need to wrap session_mutex around this TCon call and Unix
2696 * SetFS as we do on SessSetup and reconnect?
2697 */
2698 xid = get_xid();
2699 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2700 volume_info->local_nls);
2701 free_xid(xid);
2702 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2703 if (rc)
2704 goto out_fail;
2705
2706 if (volume_info->nodfs) {
2707 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2708 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2709 }
2710 tcon->seal = volume_info->seal;
2711 tcon->use_persistent = false;
2712 /* check if SMB2 or later, CIFS does not support persistent handles */
2713 if (volume_info->persistent) {
2714 if (ses->server->vals->protocol_id == 0) {
2715 cifs_dbg(VFS,
2716 "SMB3 or later required for persistent handles\n");
2717 rc = -EOPNOTSUPP;
2718 goto out_fail;
2719 #ifdef CONFIG_CIFS_SMB2
2720 } else if (ses->server->capabilities &
2721 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2722 tcon->use_persistent = true;
2723 else /* persistent handles requested but not supported */ {
2724 cifs_dbg(VFS,
2725 "Persistent handles not supported on share\n");
2726 rc = -EOPNOTSUPP;
2727 goto out_fail;
2728 #endif /* CONFIG_CIFS_SMB2 */
2729 }
2730 #ifdef CONFIG_CIFS_SMB2
2731 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2732 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2733 && (volume_info->nopersistent == false)) {
2734 cifs_dbg(FYI, "enabling persistent handles\n");
2735 tcon->use_persistent = true;
2736 #endif /* CONFIG_CIFS_SMB2 */
2737 } else if (volume_info->resilient) {
2738 if (ses->server->vals->protocol_id == 0) {
2739 cifs_dbg(VFS,
2740 "SMB2.1 or later required for resilient handles\n");
2741 rc = -EOPNOTSUPP;
2742 goto out_fail;
2743 }
2744 tcon->use_resilient = true;
2745 }
2746
2747 /*
2748 * We can have only one retry value for a connection to a share so for
2749 * resources mounted more than once to the same server share the last
2750 * value passed in for the retry flag is used.
2751 */
2752 tcon->retry = volume_info->retry;
2753 tcon->nocase = volume_info->nocase;
2754 tcon->local_lease = volume_info->local_lease;
2755 INIT_LIST_HEAD(&tcon->pending_opens);
2756
2757 spin_lock(&cifs_tcp_ses_lock);
2758 list_add(&tcon->tcon_list, &ses->tcon_list);
2759 spin_unlock(&cifs_tcp_ses_lock);
2760
2761 cifs_fscache_get_super_cookie(tcon);
2762
2763 return tcon;
2764
2765 out_fail:
2766 tconInfoFree(tcon);
2767 return ERR_PTR(rc);
2768 }
2769
2770 void
2771 cifs_put_tlink(struct tcon_link *tlink)
2772 {
2773 if (!tlink || IS_ERR(tlink))
2774 return;
2775
2776 if (!atomic_dec_and_test(&tlink->tl_count) ||
2777 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2778 tlink->tl_time = jiffies;
2779 return;
2780 }
2781
2782 if (!IS_ERR(tlink_tcon(tlink)))
2783 cifs_put_tcon(tlink_tcon(tlink));
2784 kfree(tlink);
2785 return;
2786 }
2787
2788 static inline struct tcon_link *
2789 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2790 {
2791 return cifs_sb->master_tlink;
2792 }
2793
2794 static int
2795 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2796 {
2797 struct cifs_sb_info *old = CIFS_SB(sb);
2798 struct cifs_sb_info *new = mnt_data->cifs_sb;
2799
2800 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2801 return 0;
2802
2803 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2804 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2805 return 0;
2806
2807 /*
2808 * We want to share sb only if we don't specify an r/wsize or
2809 * specified r/wsize is greater than or equal to existing one.
2810 */
2811 if (new->wsize && new->wsize < old->wsize)
2812 return 0;
2813
2814 if (new->rsize && new->rsize < old->rsize)
2815 return 0;
2816
2817 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2818 return 0;
2819
2820 if (old->mnt_file_mode != new->mnt_file_mode ||
2821 old->mnt_dir_mode != new->mnt_dir_mode)
2822 return 0;
2823
2824 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2825 return 0;
2826
2827 if (old->actimeo != new->actimeo)
2828 return 0;
2829
2830 return 1;
2831 }
2832
2833 int
2834 cifs_match_super(struct super_block *sb, void *data)
2835 {
2836 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2837 struct smb_vol *volume_info;
2838 struct cifs_sb_info *cifs_sb;
2839 struct TCP_Server_Info *tcp_srv;
2840 struct cifs_ses *ses;
2841 struct cifs_tcon *tcon;
2842 struct tcon_link *tlink;
2843 int rc = 0;
2844
2845 spin_lock(&cifs_tcp_ses_lock);
2846 cifs_sb = CIFS_SB(sb);
2847 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2848 if (IS_ERR(tlink)) {
2849 spin_unlock(&cifs_tcp_ses_lock);
2850 return rc;
2851 }
2852 tcon = tlink_tcon(tlink);
2853 ses = tcon->ses;
2854 tcp_srv = ses->server;
2855
2856 volume_info = mnt_data->vol;
2857
2858 if (!match_server(tcp_srv, volume_info) ||
2859 !match_session(ses, volume_info) ||
2860 !match_tcon(tcon, volume_info->UNC)) {
2861 rc = 0;
2862 goto out;
2863 }
2864
2865 rc = compare_mount_options(sb, mnt_data);
2866 out:
2867 spin_unlock(&cifs_tcp_ses_lock);
2868 cifs_put_tlink(tlink);
2869 return rc;
2870 }
2871
2872 int
2873 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2874 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2875 struct dfs_info3_param **referrals, int remap)
2876 {
2877 char *temp_unc;
2878 int rc = 0;
2879
2880 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2881 return -ENOSYS;
2882
2883 *num_referrals = 0;
2884 *referrals = NULL;
2885
2886 if (ses->ipc_tid == 0) {
2887 temp_unc = kmalloc(2 /* for slashes */ +
2888 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2889 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2890 if (temp_unc == NULL)
2891 return -ENOMEM;
2892 temp_unc[0] = '\\';
2893 temp_unc[1] = '\\';
2894 strcpy(temp_unc + 2, ses->serverName);
2895 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2896 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2897 nls_codepage);
2898 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2899 kfree(temp_unc);
2900 }
2901 if (rc == 0)
2902 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2903 referrals, num_referrals,
2904 nls_codepage, remap);
2905 /*
2906 * BB - map targetUNCs to dfs_info3 structures, here or in
2907 * ses->server->ops->get_dfs_refer.
2908 */
2909
2910 return rc;
2911 }
2912
2913 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2914 static struct lock_class_key cifs_key[2];
2915 static struct lock_class_key cifs_slock_key[2];
2916
2917 static inline void
2918 cifs_reclassify_socket4(struct socket *sock)
2919 {
2920 struct sock *sk = sock->sk;
2921 BUG_ON(sock_owned_by_user(sk));
2922 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2923 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2924 }
2925
2926 static inline void
2927 cifs_reclassify_socket6(struct socket *sock)
2928 {
2929 struct sock *sk = sock->sk;
2930 BUG_ON(sock_owned_by_user(sk));
2931 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2932 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2933 }
2934 #else
2935 static inline void
2936 cifs_reclassify_socket4(struct socket *sock)
2937 {
2938 }
2939
2940 static inline void
2941 cifs_reclassify_socket6(struct socket *sock)
2942 {
2943 }
2944 #endif
2945
2946 /* See RFC1001 section 14 on representation of Netbios names */
2947 static void rfc1002mangle(char *target, char *source, unsigned int length)
2948 {
2949 unsigned int i, j;
2950
2951 for (i = 0, j = 0; i < (length); i++) {
2952 /* mask a nibble at a time and encode */
2953 target[j] = 'A' + (0x0F & (source[i] >> 4));
2954 target[j+1] = 'A' + (0x0F & source[i]);
2955 j += 2;
2956 }
2957
2958 }
2959
2960 static int
2961 bind_socket(struct TCP_Server_Info *server)
2962 {
2963 int rc = 0;
2964 if (server->srcaddr.ss_family != AF_UNSPEC) {
2965 /* Bind to the specified local IP address */
2966 struct socket *socket = server->ssocket;
2967 rc = socket->ops->bind(socket,
2968 (struct sockaddr *) &server->srcaddr,
2969 sizeof(server->srcaddr));
2970 if (rc < 0) {
2971 struct sockaddr_in *saddr4;
2972 struct sockaddr_in6 *saddr6;
2973 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2974 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2975 if (saddr6->sin6_family == AF_INET6)
2976 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2977 &saddr6->sin6_addr, rc);
2978 else
2979 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2980 &saddr4->sin_addr.s_addr, rc);
2981 }
2982 }
2983 return rc;
2984 }
2985
2986 static int
2987 ip_rfc1001_connect(struct TCP_Server_Info *server)
2988 {
2989 int rc = 0;
2990 /*
2991 * some servers require RFC1001 sessinit before sending
2992 * negprot - BB check reconnection in case where second
2993 * sessinit is sent but no second negprot
2994 */
2995 struct rfc1002_session_packet *ses_init_buf;
2996 struct smb_hdr *smb_buf;
2997 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2998 GFP_KERNEL);
2999 if (ses_init_buf) {
3000 ses_init_buf->trailer.session_req.called_len = 32;
3001
3002 if (server->server_RFC1001_name &&
3003 server->server_RFC1001_name[0] != 0)
3004 rfc1002mangle(ses_init_buf->trailer.
3005 session_req.called_name,
3006 server->server_RFC1001_name,
3007 RFC1001_NAME_LEN_WITH_NULL);
3008 else
3009 rfc1002mangle(ses_init_buf->trailer.
3010 session_req.called_name,
3011 DEFAULT_CIFS_CALLED_NAME,
3012 RFC1001_NAME_LEN_WITH_NULL);
3013
3014 ses_init_buf->trailer.session_req.calling_len = 32;
3015
3016 /*
3017 * calling name ends in null (byte 16) from old smb
3018 * convention.
3019 */
3020 if (server->workstation_RFC1001_name[0] != 0)
3021 rfc1002mangle(ses_init_buf->trailer.
3022 session_req.calling_name,
3023 server->workstation_RFC1001_name,
3024 RFC1001_NAME_LEN_WITH_NULL);
3025 else
3026 rfc1002mangle(ses_init_buf->trailer.
3027 session_req.calling_name,
3028 "LINUX_CIFS_CLNT",
3029 RFC1001_NAME_LEN_WITH_NULL);
3030
3031 ses_init_buf->trailer.session_req.scope1 = 0;
3032 ses_init_buf->trailer.session_req.scope2 = 0;
3033 smb_buf = (struct smb_hdr *)ses_init_buf;
3034
3035 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3036 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3037 rc = smb_send(server, smb_buf, 0x44);
3038 kfree(ses_init_buf);
3039 /*
3040 * RFC1001 layer in at least one server
3041 * requires very short break before negprot
3042 * presumably because not expecting negprot
3043 * to follow so fast. This is a simple
3044 * solution that works without
3045 * complicating the code and causes no
3046 * significant slowing down on mount
3047 * for everyone else
3048 */
3049 usleep_range(1000, 2000);
3050 }
3051 /*
3052 * else the negprot may still work without this
3053 * even though malloc failed
3054 */
3055
3056 return rc;
3057 }
3058
3059 static int
3060 generic_ip_connect(struct TCP_Server_Info *server)
3061 {
3062 int rc = 0;
3063 __be16 sport;
3064 int slen, sfamily;
3065 struct socket *socket = server->ssocket;
3066 struct sockaddr *saddr;
3067
3068 saddr = (struct sockaddr *) &server->dstaddr;
3069
3070 if (server->dstaddr.ss_family == AF_INET6) {
3071 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3072 slen = sizeof(struct sockaddr_in6);
3073 sfamily = AF_INET6;
3074 } else {
3075 sport = ((struct sockaddr_in *) saddr)->sin_port;
3076 slen = sizeof(struct sockaddr_in);
3077 sfamily = AF_INET;
3078 }
3079
3080 if (socket == NULL) {
3081 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3082 IPPROTO_TCP, &socket, 1);
3083 if (rc < 0) {
3084 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3085 server->ssocket = NULL;
3086 return rc;
3087 }
3088
3089 /* BB other socket options to set KEEPALIVE, NODELAY? */
3090 cifs_dbg(FYI, "Socket created\n");
3091 server->ssocket = socket;
3092 socket->sk->sk_allocation = GFP_NOFS;
3093 if (sfamily == AF_INET6)
3094 cifs_reclassify_socket6(socket);
3095 else
3096 cifs_reclassify_socket4(socket);
3097 }
3098
3099 rc = bind_socket(server);
3100 if (rc < 0)
3101 return rc;
3102
3103 /*
3104 * Eventually check for other socket options to change from
3105 * the default. sock_setsockopt not used because it expects
3106 * user space buffer
3107 */
3108 socket->sk->sk_rcvtimeo = 7 * HZ;
3109 socket->sk->sk_sndtimeo = 5 * HZ;
3110
3111 /* make the bufsizes depend on wsize/rsize and max requests */
3112 if (server->noautotune) {
3113 if (socket->sk->sk_sndbuf < (200 * 1024))
3114 socket->sk->sk_sndbuf = 200 * 1024;
3115 if (socket->sk->sk_rcvbuf < (140 * 1024))
3116 socket->sk->sk_rcvbuf = 140 * 1024;
3117 }
3118
3119 if (server->tcp_nodelay) {
3120 int val = 1;
3121 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3122 (char *)&val, sizeof(val));
3123 if (rc)
3124 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3125 rc);
3126 }
3127
3128 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3129 socket->sk->sk_sndbuf,
3130 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3131
3132 rc = socket->ops->connect(socket, saddr, slen, 0);
3133 if (rc < 0) {
3134 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3135 sock_release(socket);
3136 server->ssocket = NULL;
3137 return rc;
3138 }
3139
3140 if (sport == htons(RFC1001_PORT))
3141 rc = ip_rfc1001_connect(server);
3142
3143 return rc;
3144 }
3145
3146 static int
3147 ip_connect(struct TCP_Server_Info *server)
3148 {
3149 __be16 *sport;
3150 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3151 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3152
3153 if (server->dstaddr.ss_family == AF_INET6)
3154 sport = &addr6->sin6_port;
3155 else
3156 sport = &addr->sin_port;
3157
3158 if (*sport == 0) {
3159 int rc;
3160
3161 /* try with 445 port at first */
3162 *sport = htons(CIFS_PORT);
3163
3164 rc = generic_ip_connect(server);
3165 if (rc >= 0)
3166 return rc;
3167
3168 /* if it failed, try with 139 port */
3169 *sport = htons(RFC1001_PORT);
3170 }
3171
3172 return generic_ip_connect(server);
3173 }
3174
3175 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3176 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3177 {
3178 /* if we are reconnecting then should we check to see if
3179 * any requested capabilities changed locally e.g. via
3180 * remount but we can not do much about it here
3181 * if they have (even if we could detect it by the following)
3182 * Perhaps we could add a backpointer to array of sb from tcon
3183 * or if we change to make all sb to same share the same
3184 * sb as NFS - then we only have one backpointer to sb.
3185 * What if we wanted to mount the server share twice once with
3186 * and once without posixacls or posix paths? */
3187 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3188
3189 if (vol_info && vol_info->no_linux_ext) {
3190 tcon->fsUnixInfo.Capability = 0;
3191 tcon->unix_ext = 0; /* Unix Extensions disabled */
3192 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3193 return;
3194 } else if (vol_info)
3195 tcon->unix_ext = 1; /* Unix Extensions supported */
3196
3197 if (tcon->unix_ext == 0) {
3198 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3199 return;
3200 }
3201
3202 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3203 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3204 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3205 /* check for reconnect case in which we do not
3206 want to change the mount behavior if we can avoid it */
3207 if (vol_info == NULL) {
3208 /* turn off POSIX ACL and PATHNAMES if not set
3209 originally at mount time */
3210 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3211 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3212 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3213 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3214 cifs_dbg(VFS, "POSIXPATH support change\n");
3215 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3216 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3217 cifs_dbg(VFS, "possible reconnect error\n");
3218 cifs_dbg(VFS, "server disabled POSIX path support\n");
3219 }
3220 }
3221
3222 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3223 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3224
3225 cap &= CIFS_UNIX_CAP_MASK;
3226 if (vol_info && vol_info->no_psx_acl)
3227 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3228 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3229 cifs_dbg(FYI, "negotiated posix acl support\n");
3230 if (cifs_sb)
3231 cifs_sb->mnt_cifs_flags |=
3232 CIFS_MOUNT_POSIXACL;
3233 }
3234
3235 if (vol_info && vol_info->posix_paths == 0)
3236 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3237 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3238 cifs_dbg(FYI, "negotiate posix pathnames\n");
3239 if (cifs_sb)
3240 cifs_sb->mnt_cifs_flags |=
3241 CIFS_MOUNT_POSIX_PATHS;
3242 }
3243
3244 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3245 #ifdef CONFIG_CIFS_DEBUG2
3246 if (cap & CIFS_UNIX_FCNTL_CAP)
3247 cifs_dbg(FYI, "FCNTL cap\n");
3248 if (cap & CIFS_UNIX_EXTATTR_CAP)
3249 cifs_dbg(FYI, "EXTATTR cap\n");
3250 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3251 cifs_dbg(FYI, "POSIX path cap\n");
3252 if (cap & CIFS_UNIX_XATTR_CAP)
3253 cifs_dbg(FYI, "XATTR cap\n");
3254 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3255 cifs_dbg(FYI, "POSIX ACL cap\n");
3256 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3257 cifs_dbg(FYI, "very large read cap\n");
3258 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3259 cifs_dbg(FYI, "very large write cap\n");
3260 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3261 cifs_dbg(FYI, "transport encryption cap\n");
3262 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3263 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3264 #endif /* CIFS_DEBUG2 */
3265 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3266 if (vol_info == NULL) {
3267 cifs_dbg(FYI, "resetting capabilities failed\n");
3268 } else
3269 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");
3270
3271 }
3272 }
3273 }
3274
3275 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3276 struct cifs_sb_info *cifs_sb)
3277 {
3278 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3279
3280 spin_lock_init(&cifs_sb->tlink_tree_lock);
3281 cifs_sb->tlink_tree = RB_ROOT;
3282
3283 /*
3284 * Temporarily set r/wsize for matching superblock. If we end up using
3285 * new sb then client will later negotiate it downward if needed.
3286 */
3287 cifs_sb->rsize = pvolume_info->rsize;
3288 cifs_sb->wsize = pvolume_info->wsize;
3289
3290 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3291 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3292 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3293 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3294 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3295 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3296
3297 cifs_sb->actimeo = pvolume_info->actimeo;
3298 cifs_sb->local_nls = pvolume_info->local_nls;
3299
3300 if (pvolume_info->noperm)
3301 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3302 if (pvolume_info->setuids)
3303 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3304 if (pvolume_info->server_ino)
3305 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3306 if (pvolume_info->remap)
3307 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3308 if (pvolume_info->sfu_remap)
3309 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3310 if (pvolume_info->no_xattr)
3311 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3312 if (pvolume_info->sfu_emul)
3313 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3314 if (pvolume_info->nobrl)
3315 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3316 if (pvolume_info->nostrictsync)
3317 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3318 if (pvolume_info->mand_lock)
3319 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3320 if (pvolume_info->rwpidforward)
3321 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3322 if (pvolume_info->cifs_acl)
3323 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3324 if (pvolume_info->backupuid_specified) {
3325 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3326 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3327 }
3328 if (pvolume_info->backupgid_specified) {
3329 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3330 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3331 }
3332 if (pvolume_info->override_uid)
3333 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3334 if (pvolume_info->override_gid)
3335 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3336 if (pvolume_info->dynperm)
3337 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3338 if (pvolume_info->fsc)
3339 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3340 if (pvolume_info->multiuser)
3341 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3342 CIFS_MOUNT_NO_PERM);
3343 if (pvolume_info->strict_io)
3344 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3345 if (pvolume_info->direct_io) {
3346 cifs_dbg(FYI, "mounting share using direct i/o\n");
3347 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3348 }
3349 if (pvolume_info->mfsymlinks) {
3350 if (pvolume_info->sfu_emul) {
3351 /*
3352 * Our SFU ("Services for Unix" emulation does not allow
3353 * creating symlinks but does allow reading existing SFU
3354 * symlinks (it does allow both creating and reading SFU
3355 * style mknod and FIFOs though). When "mfsymlinks" and
3356 * "sfu" are both enabled at the same time, it allows
3357 * reading both types of symlinks, but will only create
3358 * them with mfsymlinks format. This allows better
3359 * Apple compatibility (probably better for Samba too)
3360 * while still recognizing old Windows style symlinks.
3361 */
3362 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3363 }
3364 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3365 }
3366
3367 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3368 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3369 }
3370
3371 static void
3372 cleanup_volume_info_contents(struct smb_vol *volume_info)
3373 {
3374 kfree(volume_info->username);
3375 kzfree(volume_info->password);
3376 kfree(volume_info->UNC);
3377 kfree(volume_info->domainname);
3378 kfree(volume_info->iocharset);
3379 kfree(volume_info->prepath);
3380 }
3381
3382 void
3383 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3384 {
3385 if (!volume_info)
3386 return;
3387 cleanup_volume_info_contents(volume_info);
3388 kfree(volume_info);
3389 }
3390
3391
3392 #ifdef CONFIG_CIFS_DFS_UPCALL
3393 /*
3394 * cifs_build_path_to_root returns full path to root when we do not have an
3395 * exiting connection (tcon)
3396 */
3397 static char *
3398 build_unc_path_to_root(const struct smb_vol *vol,
3399 const struct cifs_sb_info *cifs_sb)
3400 {
3401 char *full_path, *pos;
3402 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3403 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3404
3405 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3406 if (full_path == NULL)
3407 return ERR_PTR(-ENOMEM);
3408
3409 strncpy(full_path, vol->UNC, unc_len);
3410 pos = full_path + unc_len;
3411
3412 if (pplen) {
3413 *pos = CIFS_DIR_SEP(cifs_sb);
3414 strncpy(pos + 1, vol->prepath, pplen);
3415 pos += pplen;
3416 }
3417
3418 *pos = '\0'; /* add trailing null */
3419 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3420 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3421 return full_path;
3422 }
3423
3424 /*
3425 * Perform a dfs referral query for a share and (optionally) prefix
3426 *
3427 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3428 * to a string containing updated options for the submount. Otherwise it
3429 * will be left untouched.
3430 *
3431 * Returns the rc from get_dfs_path to the caller, which can be used to
3432 * determine whether there were referrals.
3433 */
3434 static int
3435 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3436 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3437 int check_prefix)
3438 {
3439 int rc;
3440 unsigned int num_referrals = 0;
3441 struct dfs_info3_param *referrals = NULL;
3442 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3443
3444 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3445 if (IS_ERR(full_path))
3446 return PTR_ERR(full_path);
3447
3448 /* For DFS paths, skip the first '\' of the UNC */
3449 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3450
3451 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3452 &num_referrals, &referrals, cifs_remap(cifs_sb));
3453
3454 if (!rc && num_referrals > 0) {
3455 char *fake_devname = NULL;
3456
3457 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3458 full_path + 1, referrals,
3459 &fake_devname);
3460
3461 free_dfs_info_array(referrals, num_referrals);
3462
3463 if (IS_ERR(mdata)) {
3464 rc = PTR_ERR(mdata);
3465 mdata = NULL;
3466 } else {
3467 cleanup_volume_info_contents(volume_info);
3468 rc = cifs_setup_volume_info(volume_info, mdata,
3469 fake_devname);
3470 }
3471 kfree(fake_devname);
3472 kfree(cifs_sb->mountdata);
3473 cifs_sb->mountdata = mdata;
3474 }
3475 kfree(full_path);
3476 return rc;
3477 }
3478 #endif
3479
3480 static int
3481 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3482 const char *devname)
3483 {
3484 int rc = 0;
3485
3486 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3487 return -EINVAL;
3488
3489 if (volume_info->nullauth) {
3490 cifs_dbg(FYI, "Anonymous login\n");
3491 kfree(volume_info->username);
3492 volume_info->username = NULL;
3493 } else if (volume_info->username) {
3494 /* BB fixme parse for domain name here */
3495 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3496 } else {
3497 cifs_dbg(VFS, "No username specified\n");
3498 /* In userspace mount helper we can get user name from alternate
3499 locations such as env variables and files on disk */
3500 return -EINVAL;
3501 }
3502
3503 /* this is needed for ASCII cp to Unicode converts */
3504 if (volume_info->iocharset == NULL) {
3505 /* load_nls_default cannot return null */
3506 volume_info->local_nls = load_nls_default();
3507 } else {
3508 volume_info->local_nls = load_nls(volume_info->iocharset);
3509 if (volume_info->local_nls == NULL) {
3510 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3511 volume_info->iocharset);
3512 return -ELIBACC;
3513 }
3514 }
3515
3516 return rc;
3517 }
3518
3519 struct smb_vol *
3520 cifs_get_volume_info(char *mount_data, const char *devname)
3521 {
3522 int rc;
3523 struct smb_vol *volume_info;
3524
3525 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3526 if (!volume_info)
3527 return ERR_PTR(-ENOMEM);
3528
3529 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3530 if (rc) {
3531 cifs_cleanup_volume_info(volume_info);
3532 volume_info = ERR_PTR(rc);
3533 }
3534
3535 return volume_info;
3536 }
3537
3538 int
3539 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3540 {
3541 int rc;
3542 unsigned int xid;
3543 struct cifs_ses *ses;
3544 struct cifs_tcon *tcon;
3545 struct TCP_Server_Info *server;
3546 char *full_path;
3547 struct tcon_link *tlink;
3548 #ifdef CONFIG_CIFS_DFS_UPCALL
3549 int referral_walks_count = 0;
3550 #endif
3551
3552 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3553 if (rc)
3554 return rc;
3555
3556 #ifdef CONFIG_CIFS_DFS_UPCALL
3557 try_mount_again:
3558 /* cleanup activities if we're chasing a referral */
3559 if (referral_walks_count) {
3560 if (tcon)
3561 cifs_put_tcon(tcon);
3562 else if (ses)
3563 cifs_put_smb_ses(ses);
3564
3565 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3566
3567 free_xid(xid);
3568 }
3569 #endif
3570 rc = 0;
3571 tcon = NULL;
3572 ses = NULL;
3573 server = NULL;
3574 full_path = NULL;
3575 tlink = NULL;
3576
3577 xid = get_xid();
3578
3579 /* get a reference to a tcp session */
3580 server = cifs_get_tcp_session(volume_info);
3581 if (IS_ERR(server)) {
3582 rc = PTR_ERR(server);
3583 bdi_destroy(&cifs_sb->bdi);
3584 goto out;
3585 }
3586
3587 /* get a reference to a SMB session */
3588 ses = cifs_get_smb_ses(server, volume_info);
3589 if (IS_ERR(ses)) {
3590 rc = PTR_ERR(ses);
3591 ses = NULL;
3592 goto mount_fail_check;
3593 }
3594
3595 #ifdef CONFIG_CIFS_SMB2
3596 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3597 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3598 cifs_dbg(VFS, "persistent handles not supported by server\n");
3599 rc = -EOPNOTSUPP;
3600 goto mount_fail_check;
3601 }
3602 #endif /* CONFIG_CIFS_SMB2*/
3603
3604 /* search for existing tcon to this server share */
3605 tcon = cifs_get_tcon(ses, volume_info);
3606 if (IS_ERR(tcon)) {
3607 rc = PTR_ERR(tcon);
3608 tcon = NULL;
3609 goto remote_path_check;
3610 }
3611
3612 /* tell server which Unix caps we support */
3613 if (cap_unix(tcon->ses)) {
3614 /* reset of caps checks mount to see if unix extensions
3615 disabled for just this mount */
3616 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3617 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3618 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3619 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3620 rc = -EACCES;
3621 goto mount_fail_check;
3622 }
3623 } else
3624 tcon->unix_ext = 0; /* server does not support them */
3625
3626 /* do not care if a following call succeed - informational */
3627 if (!tcon->ipc && server->ops->qfs_tcon)
3628 server->ops->qfs_tcon(xid, tcon);
3629
3630 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3631 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3632
3633 /* tune readahead according to rsize */
3634 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3635
3636 remote_path_check:
3637 #ifdef CONFIG_CIFS_DFS_UPCALL
3638 /*
3639 * Perform an unconditional check for whether there are DFS
3640 * referrals for this path without prefix, to provide support
3641 * for DFS referrals from w2k8 servers which don't seem to respond
3642 * with PATH_NOT_COVERED to requests that include the prefix.
3643 * Chase the referral if found, otherwise continue normally.
3644 */
3645 if (referral_walks_count == 0) {
3646 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3647 false);
3648 if (!refrc) {
3649 referral_walks_count++;
3650 goto try_mount_again;
3651 }
3652 }
3653 #endif
3654
3655 /* check if a whole path is not remote */
3656 if (!rc && tcon) {
3657 if (!server->ops->is_path_accessible) {
3658 rc = -ENOSYS;
3659 goto mount_fail_check;
3660 }
3661 /*
3662 * cifs_build_path_to_root works only when we have a valid tcon
3663 */
3664 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3665 if (full_path == NULL) {
3666 rc = -ENOMEM;
3667 goto mount_fail_check;
3668 }
3669 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3670 full_path);
3671 if (rc != 0 && rc != -EREMOTE) {
3672 kfree(full_path);
3673 goto mount_fail_check;
3674 }
3675 kfree(full_path);
3676 }
3677
3678 /* get referral if needed */
3679 if (rc == -EREMOTE) {
3680 #ifdef CONFIG_CIFS_DFS_UPCALL
3681 if (referral_walks_count > MAX_NESTED_LINKS) {
3682 /*
3683 * BB: when we implement proper loop detection,
3684 * we will remove this check. But now we need it
3685 * to prevent an indefinite loop if 'DFS tree' is
3686 * misconfigured (i.e. has loops).
3687 */
3688 rc = -ELOOP;
3689 goto mount_fail_check;
3690 }
3691
3692 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3693
3694 if (!rc) {
3695 referral_walks_count++;
3696 goto try_mount_again;
3697 }
3698 goto mount_fail_check;
3699 #else /* No DFS support, return error on mount */
3700 rc = -EOPNOTSUPP;
3701 #endif
3702 }
3703
3704 if (rc)
3705 goto mount_fail_check;
3706
3707 /* now, hang the tcon off of the superblock */
3708 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3709 if (tlink == NULL) {
3710 rc = -ENOMEM;
3711 goto mount_fail_check;
3712 }
3713
3714 tlink->tl_uid = ses->linux_uid;
3715 tlink->tl_tcon = tcon;
3716 tlink->tl_time = jiffies;
3717 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3718 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3719
3720 cifs_sb->master_tlink = tlink;
3721 spin_lock(&cifs_sb->tlink_tree_lock);
3722 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3723 spin_unlock(&cifs_sb->tlink_tree_lock);
3724
3725 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3726 TLINK_IDLE_EXPIRE);
3727
3728 mount_fail_check:
3729 /* on error free sesinfo and tcon struct if needed */
3730 if (rc) {
3731 /* If find_unc succeeded then rc == 0 so we can not end */
3732 /* up accidentally freeing someone elses tcon struct */
3733 if (tcon)
3734 cifs_put_tcon(tcon);
3735 else if (ses)
3736 cifs_put_smb_ses(ses);
3737 else
3738 cifs_put_tcp_session(server);
3739 bdi_destroy(&cifs_sb->bdi);
3740 }
3741
3742 out:
3743 free_xid(xid);
3744 return rc;
3745 }
3746
3747 /*
3748 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3749 * pointer may be NULL.
3750 */
3751 int
3752 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3753 const char *tree, struct cifs_tcon *tcon,
3754 const struct nls_table *nls_codepage)
3755 {
3756 struct smb_hdr *smb_buffer;
3757 struct smb_hdr *smb_buffer_response;
3758 TCONX_REQ *pSMB;
3759 TCONX_RSP *pSMBr;
3760 unsigned char *bcc_ptr;
3761 int rc = 0;
3762 int length;
3763 __u16 bytes_left, count;
3764
3765 if (ses == NULL)
3766 return -EIO;
3767
3768 smb_buffer = cifs_buf_get();
3769 if (smb_buffer == NULL)
3770 return -ENOMEM;
3771
3772 smb_buffer_response = smb_buffer;
3773
3774 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3775 NULL /*no tid */ , 4 /*wct */ );
3776
3777 smb_buffer->Mid = get_next_mid(ses->server);
3778 smb_buffer->Uid = ses->Suid;
3779 pSMB = (TCONX_REQ *) smb_buffer;
3780 pSMBr = (TCONX_RSP *) smb_buffer_response;
3781
3782 pSMB->AndXCommand = 0xFF;
3783 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3784 bcc_ptr = &pSMB->Password[0];
3785 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3786 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3787 *bcc_ptr = 0; /* password is null byte */
3788 bcc_ptr++; /* skip password */
3789 /* already aligned so no need to do it below */
3790 } else {
3791 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3792 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3793 specified as required (when that support is added to
3794 the vfs in the future) as only NTLM or the much
3795 weaker LANMAN (which we do not send by default) is accepted
3796 by Samba (not sure whether other servers allow
3797 NTLMv2 password here) */
3798 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3799 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3800 (ses->sectype == LANMAN))
3801 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3802 ses->server->sec_mode &
3803 SECMODE_PW_ENCRYPT ? true : false,
3804 bcc_ptr);
3805 else
3806 #endif /* CIFS_WEAK_PW_HASH */
3807 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3808 bcc_ptr, nls_codepage);
3809 if (rc) {
3810 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3811 __func__, rc);
3812 cifs_buf_release(smb_buffer);
3813 return rc;
3814 }
3815
3816 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3817 if (ses->capabilities & CAP_UNICODE) {
3818 /* must align unicode strings */
3819 *bcc_ptr = 0; /* null byte password */
3820 bcc_ptr++;
3821 }
3822 }
3823
3824 if (ses->server->sign)
3825 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3826
3827 if (ses->capabilities & CAP_STATUS32) {
3828 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3829 }
3830 if (ses->capabilities & CAP_DFS) {
3831 smb_buffer->Flags2 |= SMBFLG2_DFS;
3832 }
3833 if (ses->capabilities & CAP_UNICODE) {
3834 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3835 length =
3836 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3837 6 /* max utf8 char length in bytes */ *
3838 (/* server len*/ + 256 /* share len */), nls_codepage);
3839 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3840 bcc_ptr += 2; /* skip trailing null */
3841 } else { /* ASCII */
3842 strcpy(bcc_ptr, tree);
3843 bcc_ptr += strlen(tree) + 1;
3844 }
3845 strcpy(bcc_ptr, "?????");
3846 bcc_ptr += strlen("?????");
3847 bcc_ptr += 1;
3848 count = bcc_ptr - &pSMB->Password[0];
3849 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3850 pSMB->hdr.smb_buf_length) + count);
3851 pSMB->ByteCount = cpu_to_le16(count);
3852
3853 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3854 0);
3855
3856 /* above now done in SendReceive */
3857 if ((rc == 0) && (tcon != NULL)) {
3858 bool is_unicode;
3859
3860 tcon->tidStatus = CifsGood;
3861 tcon->need_reconnect = false;
3862 tcon->tid = smb_buffer_response->Tid;
3863 bcc_ptr = pByteArea(smb_buffer_response);
3864 bytes_left = get_bcc(smb_buffer_response);
3865 length = strnlen(bcc_ptr, bytes_left - 2);
3866 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3867 is_unicode = true;
3868 else
3869 is_unicode = false;
3870
3871
3872 /* skip service field (NB: this field is always ASCII) */
3873 if (length == 3) {
3874 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3875 (bcc_ptr[2] == 'C')) {
3876 cifs_dbg(FYI, "IPC connection\n");
3877 tcon->ipc = 1;
3878 }
3879 } else if (length == 2) {
3880 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3881 /* the most common case */
3882 cifs_dbg(FYI, "disk share connection\n");
3883 }
3884 }
3885 bcc_ptr += length + 1;
3886 bytes_left -= (length + 1);
3887 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3888
3889 /* mostly informational -- no need to fail on error here */
3890 kfree(tcon->nativeFileSystem);
3891 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3892 bytes_left, is_unicode,
3893 nls_codepage);
3894
3895 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3896
3897 if ((smb_buffer_response->WordCount == 3) ||
3898 (smb_buffer_response->WordCount == 7))
3899 /* field is in same location */
3900 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3901 else
3902 tcon->Flags = 0;
3903 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3904 } else if ((rc == 0) && tcon == NULL) {
3905 /* all we need to save for IPC$ connection */
3906 ses->ipc_tid = smb_buffer_response->Tid;
3907 }
3908
3909 cifs_buf_release(smb_buffer);
3910 return rc;
3911 }
3912
3913 static void delayed_free(struct rcu_head *p)
3914 {
3915 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3916 unload_nls(sbi->local_nls);
3917 kfree(sbi);
3918 }
3919
3920 void
3921 cifs_umount(struct cifs_sb_info *cifs_sb)
3922 {
3923 struct rb_root *root = &cifs_sb->tlink_tree;
3924 struct rb_node *node;
3925 struct tcon_link *tlink;
3926
3927 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3928
3929 spin_lock(&cifs_sb->tlink_tree_lock);
3930 while ((node = rb_first(root))) {
3931 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3932 cifs_get_tlink(tlink);
3933 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3934 rb_erase(node, root);
3935
3936 spin_unlock(&cifs_sb->tlink_tree_lock);
3937 cifs_put_tlink(tlink);
3938 spin_lock(&cifs_sb->tlink_tree_lock);
3939 }
3940 spin_unlock(&cifs_sb->tlink_tree_lock);
3941
3942 bdi_destroy(&cifs_sb->bdi);
3943 kfree(cifs_sb->mountdata);
3944 call_rcu(&cifs_sb->rcu, delayed_free);
3945 }
3946
3947 int
3948 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3949 {
3950 int rc = 0;
3951 struct TCP_Server_Info *server = ses->server;
3952
3953 if (!server->ops->need_neg || !server->ops->negotiate)
3954 return -ENOSYS;
3955
3956 /* only send once per connect */
3957 if (!server->ops->need_neg(server))
3958 return 0;
3959
3960 set_credits(server, 1);
3961
3962 rc = server->ops->negotiate(xid, ses);
3963 if (rc == 0) {
3964 spin_lock(&GlobalMid_Lock);
3965 if (server->tcpStatus == CifsNeedNegotiate)
3966 server->tcpStatus = CifsGood;
3967 else
3968 rc = -EHOSTDOWN;
3969 spin_unlock(&GlobalMid_Lock);
3970 }
3971
3972 return rc;
3973 }
3974
3975 int
3976 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3977 struct nls_table *nls_info)
3978 {
3979 int rc = -ENOSYS;
3980 struct TCP_Server_Info *server = ses->server;
3981
3982 ses->capabilities = server->capabilities;
3983 if (linuxExtEnabled == 0)
3984 ses->capabilities &= (~server->vals->cap_unix);
3985
3986 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3987 server->sec_mode, server->capabilities, server->timeAdj);
3988
3989 if (server->ops->sess_setup)
3990 rc = server->ops->sess_setup(xid, ses, nls_info);
3991
3992 if (rc)
3993 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3994
3995 return rc;
3996 }
3997
3998 static int
3999 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4000 {
4001 vol->sectype = ses->sectype;
4002
4003 /* krb5 is special, since we don't need username or pw */
4004 if (vol->sectype == Kerberos)
4005 return 0;
4006
4007 return cifs_set_cifscreds(vol, ses);
4008 }
4009
4010 static struct cifs_tcon *
4011 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4012 {
4013 int rc;
4014 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4015 struct cifs_ses *ses;
4016 struct cifs_tcon *tcon = NULL;
4017 struct smb_vol *vol_info;
4018
4019 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4020 if (vol_info == NULL)
4021 return ERR_PTR(-ENOMEM);
4022
4023 vol_info->local_nls = cifs_sb->local_nls;
4024 vol_info->linux_uid = fsuid;
4025 vol_info->cred_uid = fsuid;
4026 vol_info->UNC = master_tcon->treeName;
4027 vol_info->retry = master_tcon->retry;
4028 vol_info->nocase = master_tcon->nocase;
4029 vol_info->local_lease = master_tcon->local_lease;
4030 vol_info->no_linux_ext = !master_tcon->unix_ext;
4031 vol_info->sectype = master_tcon->ses->sectype;
4032 vol_info->sign = master_tcon->ses->sign;
4033
4034 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4035 if (rc) {
4036 tcon = ERR_PTR(rc);
4037 goto out;
4038 }
4039
4040 /* get a reference for the same TCP session */
4041 spin_lock(&cifs_tcp_ses_lock);
4042 ++master_tcon->ses->server->srv_count;
4043 spin_unlock(&cifs_tcp_ses_lock);
4044
4045 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4046 if (IS_ERR(ses)) {
4047 tcon = (struct cifs_tcon *)ses;
4048 cifs_put_tcp_session(master_tcon->ses->server);
4049 goto out;
4050 }
4051
4052 tcon = cifs_get_tcon(ses, vol_info);
4053 if (IS_ERR(tcon)) {
4054 cifs_put_smb_ses(ses);
4055 goto out;
4056 }
4057
4058 if (cap_unix(ses))
4059 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4060 out:
4061 kfree(vol_info->username);
4062 kfree(vol_info->password);
4063 kfree(vol_info);
4064
4065 return tcon;
4066 }
4067
4068 struct cifs_tcon *
4069 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4070 {
4071 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4072 }
4073
4074 /* find and return a tlink with given uid */
4075 static struct tcon_link *
4076 tlink_rb_search(struct rb_root *root, kuid_t uid)
4077 {
4078 struct rb_node *node = root->rb_node;
4079 struct tcon_link *tlink;
4080
4081 while (node) {
4082 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4083
4084 if (uid_gt(tlink->tl_uid, uid))
4085 node = node->rb_left;
4086 else if (uid_lt(tlink->tl_uid, uid))
4087 node = node->rb_right;
4088 else
4089 return tlink;
4090 }
4091 return NULL;
4092 }
4093
4094 /* insert a tcon_link into the tree */
4095 static void
4096 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4097 {
4098 struct rb_node **new = &(root->rb_node), *parent = NULL;
4099 struct tcon_link *tlink;
4100
4101 while (*new) {
4102 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4103 parent = *new;
4104
4105 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4106 new = &((*new)->rb_left);
4107 else
4108 new = &((*new)->rb_right);
4109 }
4110
4111 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4112 rb_insert_color(&new_tlink->tl_rbnode, root);
4113 }
4114
4115 /*
4116 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4117 * current task.
4118 *
4119 * If the superblock doesn't refer to a multiuser mount, then just return
4120 * the master tcon for the mount.
4121 *
4122 * First, search the rbtree for an existing tcon for this fsuid. If one
4123 * exists, then check to see if it's pending construction. If it is then wait
4124 * for construction to complete. Once it's no longer pending, check to see if
4125 * it failed and either return an error or retry construction, depending on
4126 * the timeout.
4127 *
4128 * If one doesn't exist then insert a new tcon_link struct into the tree and
4129 * try to construct a new one.
4130 */
4131 struct tcon_link *
4132 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4133 {
4134 int ret;
4135 kuid_t fsuid = current_fsuid();
4136 struct tcon_link *tlink, *newtlink;
4137
4138 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4139 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4140
4141 spin_lock(&cifs_sb->tlink_tree_lock);
4142 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4143 if (tlink)
4144 cifs_get_tlink(tlink);
4145 spin_unlock(&cifs_sb->tlink_tree_lock);
4146
4147 if (tlink == NULL) {
4148 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4149 if (newtlink == NULL)
4150 return ERR_PTR(-ENOMEM);
4151 newtlink->tl_uid = fsuid;
4152 newtlink->tl_tcon = ERR_PTR(-EACCES);
4153 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4154 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4155 cifs_get_tlink(newtlink);
4156
4157 spin_lock(&cifs_sb->tlink_tree_lock);
4158 /* was one inserted after previous search? */
4159 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4160 if (tlink) {
4161 cifs_get_tlink(tlink);
4162 spin_unlock(&cifs_sb->tlink_tree_lock);
4163 kfree(newtlink);
4164 goto wait_for_construction;
4165 }
4166 tlink = newtlink;
4167 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4168 spin_unlock(&cifs_sb->tlink_tree_lock);
4169 } else {
4170 wait_for_construction:
4171 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4172 TASK_INTERRUPTIBLE);
4173 if (ret) {
4174 cifs_put_tlink(tlink);
4175 return ERR_PTR(-ERESTARTSYS);
4176 }
4177
4178 /* if it's good, return it */
4179 if (!IS_ERR(tlink->tl_tcon))
4180 return tlink;
4181
4182 /* return error if we tried this already recently */
4183 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4184 cifs_put_tlink(tlink);
4185 return ERR_PTR(-EACCES);
4186 }
4187
4188 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4189 goto wait_for_construction;
4190 }
4191
4192 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4193 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4194 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4195
4196 if (IS_ERR(tlink->tl_tcon)) {
4197 cifs_put_tlink(tlink);
4198 return ERR_PTR(-EACCES);
4199 }
4200
4201 return tlink;
4202 }
4203
4204 /*
4205 * periodic workqueue job that scans tcon_tree for a superblock and closes
4206 * out tcons.
4207 */
4208 static void
4209 cifs_prune_tlinks(struct work_struct *work)
4210 {
4211 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4212 prune_tlinks.work);
4213 struct rb_root *root = &cifs_sb->tlink_tree;
4214 struct rb_node *node = rb_first(root);
4215 struct rb_node *tmp;
4216 struct tcon_link *tlink;
4217
4218 /*
4219 * Because we drop the spinlock in the loop in order to put the tlink
4220 * it's not guarded against removal of links from the tree. The only
4221 * places that remove entries from the tree are this function and
4222 * umounts. Because this function is non-reentrant and is canceled
4223 * before umount can proceed, this is safe.
4224 */
4225 spin_lock(&cifs_sb->tlink_tree_lock);
4226 node = rb_first(root);
4227 while (node != NULL) {
4228 tmp = node;
4229 node = rb_next(tmp);
4230 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4231
4232 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4233 atomic_read(&tlink->tl_count) != 0 ||
4234 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4235 continue;
4236
4237 cifs_get_tlink(tlink);
4238 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4239 rb_erase(tmp, root);
4240
4241 spin_unlock(&cifs_sb->tlink_tree_lock);
4242 cifs_put_tlink(tlink);
4243 spin_lock(&cifs_sb->tlink_tree_lock);
4244 }
4245 spin_unlock(&cifs_sb->tlink_tree_lock);
4246
4247 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4248 TLINK_IDLE_EXPIRE);
4249 }
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