projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
42 #include <net/ipv6.h>
43 #include <linux/parser.h>
44
45 #include "cifspdu.h"
46 #include "cifsglob.h"
47 #include "cifsproto.h"
48 #include "cifs_unicode.h"
49 #include "cifs_debug.h"
50 #include "cifs_fs_sb.h"
51 #include "ntlmssp.h"
52 #include "nterr.h"
53 #include "rfc1002pdu.h"
54 #include "fscache.h"
55
56 #define CIFS_PORT 445
57 #define RFC1001_PORT 139
58
59 extern mempool_t *cifs_req_poolp;
60
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
64
65 enum {
66
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_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
91 /* Mount options which take numeric value */
92 Opt_backupuid, Opt_backupgid, Opt_uid,
93 Opt_cruid, Opt_gid, Opt_file_mode,
94 Opt_dirmode, Opt_port,
95 Opt_rsize, Opt_wsize, Opt_actimeo,
96
97 /* Mount options which take string value */
98 Opt_user, Opt_pass, Opt_ip,
99 Opt_domain, Opt_srcaddr, Opt_iocharset,
100 Opt_netbiosname, Opt_servern,
101 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
102
103 /* Mount options to be ignored */
104 Opt_ignore,
105
106 /* Options which could be blank */
107 Opt_blank_pass,
108 Opt_blank_user,
109 Opt_blank_ip,
110
111 Opt_err
112 };
113
114 static const match_table_t cifs_mount_option_tokens = {
115
116 { Opt_user_xattr, "user_xattr" },
117 { Opt_nouser_xattr, "nouser_xattr" },
118 { Opt_forceuid, "forceuid" },
119 { Opt_noforceuid, "noforceuid" },
120 { Opt_forcegid, "forcegid" },
121 { Opt_noforcegid, "noforcegid" },
122 { Opt_noblocksend, "noblocksend" },
123 { Opt_noautotune, "noautotune" },
124 { Opt_hard, "hard" },
125 { Opt_soft, "soft" },
126 { Opt_perm, "perm" },
127 { Opt_noperm, "noperm" },
128 { Opt_mapchars, "mapchars" }, /* SFU style */
129 { Opt_nomapchars, "nomapchars" },
130 { Opt_mapposix, "mapposix" }, /* SFM style */
131 { Opt_nomapposix, "nomapposix" },
132 { Opt_sfu, "sfu" },
133 { Opt_nosfu, "nosfu" },
134 { Opt_nodfs, "nodfs" },
135 { Opt_posixpaths, "posixpaths" },
136 { Opt_noposixpaths, "noposixpaths" },
137 { Opt_nounix, "nounix" },
138 { Opt_nounix, "nolinux" },
139 { Opt_nocase, "nocase" },
140 { Opt_nocase, "ignorecase" },
141 { Opt_brl, "brl" },
142 { Opt_nobrl, "nobrl" },
143 { Opt_nobrl, "nolock" },
144 { Opt_forcemandatorylock, "forcemandatorylock" },
145 { Opt_forcemandatorylock, "forcemand" },
146 { Opt_setuids, "setuids" },
147 { Opt_nosetuids, "nosetuids" },
148 { Opt_dynperm, "dynperm" },
149 { Opt_nodynperm, "nodynperm" },
150 { Opt_nohard, "nohard" },
151 { Opt_nosoft, "nosoft" },
152 { Opt_nointr, "nointr" },
153 { Opt_intr, "intr" },
154 { Opt_nostrictsync, "nostrictsync" },
155 { Opt_strictsync, "strictsync" },
156 { Opt_serverino, "serverino" },
157 { Opt_noserverino, "noserverino" },
158 { Opt_rwpidforward, "rwpidforward" },
159 { Opt_cifsacl, "cifsacl" },
160 { Opt_nocifsacl, "nocifsacl" },
161 { Opt_acl, "acl" },
162 { Opt_noacl, "noacl" },
163 { Opt_locallease, "locallease" },
164 { Opt_sign, "sign" },
165 { Opt_seal, "seal" },
166 { Opt_noac, "noac" },
167 { Opt_fsc, "fsc" },
168 { Opt_mfsymlinks, "mfsymlinks" },
169 { Opt_multiuser, "multiuser" },
170 { Opt_sloppy, "sloppy" },
171 { Opt_nosharesock, "nosharesock" },
172
173 { Opt_backupuid, "backupuid=%s" },
174 { Opt_backupgid, "backupgid=%s" },
175 { Opt_uid, "uid=%s" },
176 { Opt_cruid, "cruid=%s" },
177 { Opt_gid, "gid=%s" },
178 { Opt_file_mode, "file_mode=%s" },
179 { Opt_dirmode, "dirmode=%s" },
180 { Opt_dirmode, "dir_mode=%s" },
181 { Opt_port, "port=%s" },
182 { Opt_rsize, "rsize=%s" },
183 { Opt_wsize, "wsize=%s" },
184 { Opt_actimeo, "actimeo=%s" },
185
186 { Opt_blank_user, "user=" },
187 { Opt_blank_user, "username=" },
188 { Opt_user, "user=%s" },
189 { Opt_user, "username=%s" },
190 { Opt_blank_pass, "pass=" },
191 { Opt_blank_pass, "password=" },
192 { Opt_pass, "pass=%s" },
193 { Opt_pass, "password=%s" },
194 { Opt_blank_ip, "ip=" },
195 { Opt_blank_ip, "addr=" },
196 { Opt_ip, "ip=%s" },
197 { Opt_ip, "addr=%s" },
198 { Opt_ignore, "unc=%s" },
199 { Opt_ignore, "target=%s" },
200 { Opt_ignore, "path=%s" },
201 { Opt_domain, "dom=%s" },
202 { Opt_domain, "domain=%s" },
203 { Opt_domain, "workgroup=%s" },
204 { Opt_srcaddr, "srcaddr=%s" },
205 { Opt_ignore, "prefixpath=%s" },
206 { Opt_iocharset, "iocharset=%s" },
207 { Opt_netbiosname, "netbiosname=%s" },
208 { Opt_servern, "servern=%s" },
209 { Opt_ver, "ver=%s" },
210 { Opt_vers, "vers=%s" },
211 { Opt_sec, "sec=%s" },
212 { Opt_cache, "cache=%s" },
213
214 { Opt_ignore, "cred" },
215 { Opt_ignore, "credentials" },
216 { Opt_ignore, "cred=%s" },
217 { Opt_ignore, "credentials=%s" },
218 { Opt_ignore, "guest" },
219 { Opt_ignore, "rw" },
220 { Opt_ignore, "ro" },
221 { Opt_ignore, "suid" },
222 { Opt_ignore, "nosuid" },
223 { Opt_ignore, "exec" },
224 { Opt_ignore, "noexec" },
225 { Opt_ignore, "nodev" },
226 { Opt_ignore, "noauto" },
227 { Opt_ignore, "dev" },
228 { Opt_ignore, "mand" },
229 { Opt_ignore, "nomand" },
230 { Opt_ignore, "_netdev" },
231
232 { Opt_err, NULL }
233 };
234
235 enum {
236 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
237 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
238 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
239 Opt_sec_ntlmv2i, Opt_sec_lanman,
240 Opt_sec_none,
241
242 Opt_sec_err
243 };
244
245 static const match_table_t cifs_secflavor_tokens = {
246 { Opt_sec_krb5, "krb5" },
247 { Opt_sec_krb5i, "krb5i" },
248 { Opt_sec_krb5p, "krb5p" },
249 { Opt_sec_ntlmsspi, "ntlmsspi" },
250 { Opt_sec_ntlmssp, "ntlmssp" },
251 { Opt_ntlm, "ntlm" },
252 { Opt_sec_ntlmi, "ntlmi" },
253 { Opt_sec_ntlmv2, "nontlm" },
254 { Opt_sec_ntlmv2, "ntlmv2" },
255 { Opt_sec_ntlmv2i, "ntlmv2i" },
256 { Opt_sec_lanman, "lanman" },
257 { Opt_sec_none, "none" },
258
259 { Opt_sec_err, NULL }
260 };
261
262 /* cache flavors */
263 enum {
264 Opt_cache_loose,
265 Opt_cache_strict,
266 Opt_cache_none,
267 Opt_cache_err
268 };
269
270 static const match_table_t cifs_cacheflavor_tokens = {
271 { Opt_cache_loose, "loose" },
272 { Opt_cache_strict, "strict" },
273 { Opt_cache_none, "none" },
274 { Opt_cache_err, NULL }
275 };
276
277 static const match_table_t cifs_smb_version_tokens = {
278 { Smb_1, SMB1_VERSION_STRING },
279 { Smb_20, SMB20_VERSION_STRING},
280 { Smb_21, SMB21_VERSION_STRING },
281 { Smb_30, SMB30_VERSION_STRING },
282 { Smb_302, SMB302_VERSION_STRING },
283 };
284
285 static int ip_connect(struct TCP_Server_Info *server);
286 static int generic_ip_connect(struct TCP_Server_Info *server);
287 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
288 static void cifs_prune_tlinks(struct work_struct *work);
289 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
290 const char *devname);
291
292 /*
293 * cifs tcp session reconnection
294 *
295 * mark tcp session as reconnecting so temporarily locked
296 * mark all smb sessions as reconnecting for tcp session
297 * reconnect tcp session
298 * wake up waiters on reconnection? - (not needed currently)
299 */
300 int
301 cifs_reconnect(struct TCP_Server_Info *server)
302 {
303 int rc = 0;
304 struct list_head *tmp, *tmp2;
305 struct cifs_ses *ses;
306 struct cifs_tcon *tcon;
307 struct mid_q_entry *mid_entry;
308 struct list_head retry_list;
309
310 spin_lock(&GlobalMid_Lock);
311 if (server->tcpStatus == CifsExiting) {
312 /* the demux thread will exit normally
313 next time through the loop */
314 spin_unlock(&GlobalMid_Lock);
315 return rc;
316 } else
317 server->tcpStatus = CifsNeedReconnect;
318 spin_unlock(&GlobalMid_Lock);
319 server->maxBuf = 0;
320 #ifdef CONFIG_CIFS_SMB2
321 server->max_read = 0;
322 #endif
323
324 cifs_dbg(FYI, "Reconnecting tcp session\n");
325
326 /* before reconnecting the tcp session, mark the smb session (uid)
327 and the tid bad so they are not used until reconnected */
328 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
329 __func__);
330 spin_lock(&cifs_tcp_ses_lock);
331 list_for_each(tmp, &server->smb_ses_list) {
332 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
333 ses->need_reconnect = true;
334 ses->ipc_tid = 0;
335 list_for_each(tmp2, &ses->tcon_list) {
336 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
337 tcon->need_reconnect = true;
338 }
339 }
340 spin_unlock(&cifs_tcp_ses_lock);
341
342 /* do not want to be sending data on a socket we are freeing */
343 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
344 mutex_lock(&server->srv_mutex);
345 if (server->ssocket) {
346 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
347 server->ssocket->state, server->ssocket->flags);
348 kernel_sock_shutdown(server->ssocket, SHUT_WR);
349 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
350 server->ssocket->state, server->ssocket->flags);
351 sock_release(server->ssocket);
352 server->ssocket = NULL;
353 }
354 server->sequence_number = 0;
355 server->session_estab = false;
356 kfree(server->session_key.response);
357 server->session_key.response = NULL;
358 server->session_key.len = 0;
359 server->lstrp = jiffies;
360 mutex_unlock(&server->srv_mutex);
361
362 /* mark submitted MIDs for retry and issue callback */
363 INIT_LIST_HEAD(&retry_list);
364 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
365 spin_lock(&GlobalMid_Lock);
366 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
367 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
368 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
369 mid_entry->mid_state = MID_RETRY_NEEDED;
370 list_move(&mid_entry->qhead, &retry_list);
371 }
372 spin_unlock(&GlobalMid_Lock);
373
374 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
375 list_for_each_safe(tmp, tmp2, &retry_list) {
376 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
377 list_del_init(&mid_entry->qhead);
378 mid_entry->callback(mid_entry);
379 }
380
381 do {
382 try_to_freeze();
383
384 /* we should try only the port we connected to before */
385 mutex_lock(&server->srv_mutex);
386 rc = generic_ip_connect(server);
387 if (rc) {
388 cifs_dbg(FYI, "reconnect error %d\n", rc);
389 msleep(3000);
390 } else {
391 atomic_inc(&tcpSesReconnectCount);
392 spin_lock(&GlobalMid_Lock);
393 if (server->tcpStatus != CifsExiting)
394 server->tcpStatus = CifsNeedNegotiate;
395 spin_unlock(&GlobalMid_Lock);
396 }
397 mutex_unlock(&server->srv_mutex);
398 } while (server->tcpStatus == CifsNeedReconnect);
399
400 return rc;
401 }
402
403 static void
404 cifs_echo_request(struct work_struct *work)
405 {
406 int rc;
407 struct TCP_Server_Info *server = container_of(work,
408 struct TCP_Server_Info, echo.work);
409
410 /*
411 * We cannot send an echo if it is disabled or until the
412 * NEGOTIATE_PROTOCOL request is done, which is indicated by
413 * server->ops->need_neg() == true. Also, no need to ping if
414 * we got a response recently.
415 */
416 if (!server->ops->need_neg || server->ops->need_neg(server) ||
417 (server->ops->can_echo && !server->ops->can_echo(server)) ||
418 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
419 goto requeue_echo;
420
421 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
422 if (rc)
423 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
424 server->hostname);
425
426 requeue_echo:
427 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
428 }
429
430 static bool
431 allocate_buffers(struct TCP_Server_Info *server)
432 {
433 if (!server->bigbuf) {
434 server->bigbuf = (char *)cifs_buf_get();
435 if (!server->bigbuf) {
436 cifs_dbg(VFS, "No memory for large SMB response\n");
437 msleep(3000);
438 /* retry will check if exiting */
439 return false;
440 }
441 } else if (server->large_buf) {
442 /* we are reusing a dirty large buf, clear its start */
443 memset(server->bigbuf, 0, HEADER_SIZE(server));
444 }
445
446 if (!server->smallbuf) {
447 server->smallbuf = (char *)cifs_small_buf_get();
448 if (!server->smallbuf) {
449 cifs_dbg(VFS, "No memory for SMB response\n");
450 msleep(1000);
451 /* retry will check if exiting */
452 return false;
453 }
454 /* beginning of smb buffer is cleared in our buf_get */
455 } else {
456 /* if existing small buf clear beginning */
457 memset(server->smallbuf, 0, HEADER_SIZE(server));
458 }
459
460 return true;
461 }
462
463 static bool
464 server_unresponsive(struct TCP_Server_Info *server)
465 {
466 /*
467 * We need to wait 2 echo intervals to make sure we handle such
468 * situations right:
469 * 1s client sends a normal SMB request
470 * 2s client gets a response
471 * 30s echo workqueue job pops, and decides we got a response recently
472 * and don't need to send another
473 * ...
474 * 65s kernel_recvmsg times out, and we see that we haven't gotten
475 * a response in >60s.
476 */
477 if (server->tcpStatus == CifsGood &&
478 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
479 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
480 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
481 cifs_reconnect(server);
482 wake_up(&server->response_q);
483 return true;
484 }
485
486 return false;
487 }
488
489 /*
490 * kvec_array_init - clone a kvec array, and advance into it
491 * @new: pointer to memory for cloned array
492 * @iov: pointer to original array
493 * @nr_segs: number of members in original array
494 * @bytes: number of bytes to advance into the cloned array
495 *
496 * This function will copy the array provided in iov to a section of memory
497 * and advance the specified number of bytes into the new array. It returns
498 * the number of segments in the new array. "new" must be at least as big as
499 * the original iov array.
500 */
501 static unsigned int
502 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
503 size_t bytes)
504 {
505 size_t base = 0;
506
507 while (bytes || !iov->iov_len) {
508 int copy = min(bytes, iov->iov_len);
509
510 bytes -= copy;
511 base += copy;
512 if (iov->iov_len == base) {
513 iov++;
514 nr_segs--;
515 base = 0;
516 }
517 }
518 memcpy(new, iov, sizeof(*iov) * nr_segs);
519 new->iov_base += base;
520 new->iov_len -= base;
521 return nr_segs;
522 }
523
524 static struct kvec *
525 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
526 {
527 struct kvec *new_iov;
528
529 if (server->iov && nr_segs <= server->nr_iov)
530 return server->iov;
531
532 /* not big enough -- allocate a new one and release the old */
533 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
534 if (new_iov) {
535 kfree(server->iov);
536 server->iov = new_iov;
537 server->nr_iov = nr_segs;
538 }
539 return new_iov;
540 }
541
542 int
543 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
544 unsigned int nr_segs, unsigned int to_read)
545 {
546 int length = 0;
547 int total_read;
548 unsigned int segs;
549 struct msghdr smb_msg;
550 struct kvec *iov;
551
552 iov = get_server_iovec(server, nr_segs);
553 if (!iov)
554 return -ENOMEM;
555
556 smb_msg.msg_control = NULL;
557 smb_msg.msg_controllen = 0;
558
559 for (total_read = 0; to_read; total_read += length, to_read -= length) {
560 try_to_freeze();
561
562 if (server_unresponsive(server)) {
563 total_read = -ECONNABORTED;
564 break;
565 }
566
567 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
568
569 length = kernel_recvmsg(server->ssocket, &smb_msg,
570 iov, segs, to_read, 0);
571
572 if (server->tcpStatus == CifsExiting) {
573 total_read = -ESHUTDOWN;
574 break;
575 } else if (server->tcpStatus == CifsNeedReconnect) {
576 cifs_reconnect(server);
577 total_read = -ECONNABORTED;
578 break;
579 } else if (length == -ERESTARTSYS ||
580 length == -EAGAIN ||
581 length == -EINTR) {
582 /*
583 * Minimum sleep to prevent looping, allowing socket
584 * to clear and app threads to set tcpStatus
585 * CifsNeedReconnect if server hung.
586 */
587 usleep_range(1000, 2000);
588 length = 0;
589 continue;
590 } else if (length <= 0) {
591 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
592 "got %d", to_read, length);
593 cifs_reconnect(server);
594 total_read = -ECONNABORTED;
595 break;
596 }
597 }
598 return total_read;
599 }
600
601 int
602 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
603 unsigned int to_read)
604 {
605 struct kvec iov;
606
607 iov.iov_base = buf;
608 iov.iov_len = to_read;
609
610 return cifs_readv_from_socket(server, &iov, 1, to_read);
611 }
612
613 static bool
614 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
615 {
616 /*
617 * The first byte big endian of the length field,
618 * is actually not part of the length but the type
619 * with the most common, zero, as regular data.
620 */
621 switch (type) {
622 case RFC1002_SESSION_MESSAGE:
623 /* Regular SMB response */
624 return true;
625 case RFC1002_SESSION_KEEP_ALIVE:
626 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
627 break;
628 case RFC1002_POSITIVE_SESSION_RESPONSE:
629 cifs_dbg(FYI, "RFC 1002 positive session response\n");
630 break;
631 case RFC1002_NEGATIVE_SESSION_RESPONSE:
632 /*
633 * We get this from Windows 98 instead of an error on
634 * SMB negprot response.
635 */
636 cifs_dbg(FYI, "RFC 1002 negative session response\n");
637 /* give server a second to clean up */
638 msleep(1000);
639 /*
640 * Always try 445 first on reconnect since we get NACK
641 * on some if we ever connected to port 139 (the NACK
642 * is since we do not begin with RFC1001 session
643 * initialize frame).
644 */
645 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
646 cifs_reconnect(server);
647 wake_up(&server->response_q);
648 break;
649 default:
650 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
651 cifs_reconnect(server);
652 }
653
654 return false;
655 }
656
657 void
658 dequeue_mid(struct mid_q_entry *mid, bool malformed)
659 {
660 #ifdef CONFIG_CIFS_STATS2
661 mid->when_received = jiffies;
662 #endif
663 spin_lock(&GlobalMid_Lock);
664 if (!malformed)
665 mid->mid_state = MID_RESPONSE_RECEIVED;
666 else
667 mid->mid_state = MID_RESPONSE_MALFORMED;
668 list_del_init(&mid->qhead);
669 spin_unlock(&GlobalMid_Lock);
670 }
671
672 static void
673 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
674 char *buf, int malformed)
675 {
676 if (server->ops->check_trans2 &&
677 server->ops->check_trans2(mid, server, buf, malformed))
678 return;
679 mid->resp_buf = buf;
680 mid->large_buf = server->large_buf;
681 /* Was previous buf put in mpx struct for multi-rsp? */
682 if (!mid->multiRsp) {
683 /* smb buffer will be freed by user thread */
684 if (server->large_buf)
685 server->bigbuf = NULL;
686 else
687 server->smallbuf = NULL;
688 }
689 dequeue_mid(mid, malformed);
690 }
691
692 static void clean_demultiplex_info(struct TCP_Server_Info *server)
693 {
694 int length;
695
696 /* take it off the list, if it's not already */
697 spin_lock(&cifs_tcp_ses_lock);
698 list_del_init(&server->tcp_ses_list);
699 spin_unlock(&cifs_tcp_ses_lock);
700
701 spin_lock(&GlobalMid_Lock);
702 server->tcpStatus = CifsExiting;
703 spin_unlock(&GlobalMid_Lock);
704 wake_up_all(&server->response_q);
705
706 /* check if we have blocked requests that need to free */
707 spin_lock(&server->req_lock);
708 if (server->credits <= 0)
709 server->credits = 1;
710 spin_unlock(&server->req_lock);
711 /*
712 * Although there should not be any requests blocked on this queue it
713 * can not hurt to be paranoid and try to wake up requests that may
714 * haven been blocked when more than 50 at time were on the wire to the
715 * same server - they now will see the session is in exit state and get
716 * out of SendReceive.
717 */
718 wake_up_all(&server->request_q);
719 /* give those requests time to exit */
720 msleep(125);
721
722 if (server->ssocket) {
723 sock_release(server->ssocket);
724 server->ssocket = NULL;
725 }
726
727 if (!list_empty(&server->pending_mid_q)) {
728 struct list_head dispose_list;
729 struct mid_q_entry *mid_entry;
730 struct list_head *tmp, *tmp2;
731
732 INIT_LIST_HEAD(&dispose_list);
733 spin_lock(&GlobalMid_Lock);
734 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
735 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
736 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
737 mid_entry->mid_state = MID_SHUTDOWN;
738 list_move(&mid_entry->qhead, &dispose_list);
739 }
740 spin_unlock(&GlobalMid_Lock);
741
742 /* now walk dispose list and issue callbacks */
743 list_for_each_safe(tmp, tmp2, &dispose_list) {
744 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
745 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
746 list_del_init(&mid_entry->qhead);
747 mid_entry->callback(mid_entry);
748 }
749 /* 1/8th of sec is more than enough time for them to exit */
750 msleep(125);
751 }
752
753 if (!list_empty(&server->pending_mid_q)) {
754 /*
755 * mpx threads have not exited yet give them at least the smb
756 * send timeout time for long ops.
757 *
758 * Due to delays on oplock break requests, we need to wait at
759 * least 45 seconds before giving up on a request getting a
760 * response and going ahead and killing cifsd.
761 */
762 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
763 msleep(46000);
764 /*
765 * If threads still have not exited they are probably never
766 * coming home not much else we can do but free the memory.
767 */
768 }
769
770 kfree(server->hostname);
771 kfree(server->iov);
772 kfree(server);
773
774 length = atomic_dec_return(&tcpSesAllocCount);
775 if (length > 0)
776 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
777 GFP_KERNEL);
778 }
779
780 static int
781 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
782 {
783 int length;
784 char *buf = server->smallbuf;
785 unsigned int pdu_length = get_rfc1002_length(buf);
786
787 /* make sure this will fit in a large buffer */
788 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
789 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
790 cifs_reconnect(server);
791 wake_up(&server->response_q);
792 return -ECONNABORTED;
793 }
794
795 /* switch to large buffer if too big for a small one */
796 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
797 server->large_buf = true;
798 memcpy(server->bigbuf, buf, server->total_read);
799 buf = server->bigbuf;
800 }
801
802 /* now read the rest */
803 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
804 pdu_length - HEADER_SIZE(server) + 1 + 4);
805 if (length < 0)
806 return length;
807 server->total_read += length;
808
809 dump_smb(buf, server->total_read);
810
811 /*
812 * We know that we received enough to get to the MID as we
813 * checked the pdu_length earlier. Now check to see
814 * if the rest of the header is OK. We borrow the length
815 * var for the rest of the loop to avoid a new stack var.
816 *
817 * 48 bytes is enough to display the header and a little bit
818 * into the payload for debugging purposes.
819 */
820 length = server->ops->check_message(buf, server->total_read);
821 if (length != 0)
822 cifs_dump_mem("Bad SMB: ", buf,
823 min_t(unsigned int, server->total_read, 48));
824
825 if (server->ops->is_status_pending &&
826 server->ops->is_status_pending(buf, server, length))
827 return -1;
828
829 if (!mid)
830 return length;
831
832 handle_mid(mid, server, buf, length);
833 return 0;
834 }
835
836 static int
837 cifs_demultiplex_thread(void *p)
838 {
839 int length;
840 struct TCP_Server_Info *server = p;
841 unsigned int pdu_length;
842 char *buf = NULL;
843 struct task_struct *task_to_wake = NULL;
844 struct mid_q_entry *mid_entry;
845
846 current->flags |= PF_MEMALLOC;
847 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
848
849 length = atomic_inc_return(&tcpSesAllocCount);
850 if (length > 1)
851 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
852 GFP_KERNEL);
853
854 set_freezable();
855 while (server->tcpStatus != CifsExiting) {
856 if (try_to_freeze())
857 continue;
858
859 if (!allocate_buffers(server))
860 continue;
861
862 server->large_buf = false;
863 buf = server->smallbuf;
864 pdu_length = 4; /* enough to get RFC1001 header */
865
866 length = cifs_read_from_socket(server, buf, pdu_length);
867 if (length < 0)
868 continue;
869 server->total_read = length;
870
871 /*
872 * The right amount was read from socket - 4 bytes,
873 * so we can now interpret the length field.
874 */
875 pdu_length = get_rfc1002_length(buf);
876
877 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
878 if (!is_smb_response(server, buf[0]))
879 continue;
880
881 /* make sure we have enough to get to the MID */
882 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
883 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
884 pdu_length);
885 cifs_reconnect(server);
886 wake_up(&server->response_q);
887 continue;
888 }
889
890 /* read down to the MID */
891 length = cifs_read_from_socket(server, buf + 4,
892 HEADER_SIZE(server) - 1 - 4);
893 if (length < 0)
894 continue;
895 server->total_read += length;
896
897 mid_entry = server->ops->find_mid(server, buf);
898
899 if (!mid_entry || !mid_entry->receive)
900 length = standard_receive3(server, mid_entry);
901 else
902 length = mid_entry->receive(server, mid_entry);
903
904 if (length < 0)
905 continue;
906
907 if (server->large_buf)
908 buf = server->bigbuf;
909
910 server->lstrp = jiffies;
911 if (mid_entry != NULL) {
912 if (!mid_entry->multiRsp || mid_entry->multiEnd)
913 mid_entry->callback(mid_entry);
914 } else if (!server->ops->is_oplock_break ||
915 !server->ops->is_oplock_break(buf, server)) {
916 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
917 atomic_read(&midCount));
918 cifs_dump_mem("Received Data is: ", buf,
919 HEADER_SIZE(server));
920 #ifdef CONFIG_CIFS_DEBUG2
921 if (server->ops->dump_detail)
922 server->ops->dump_detail(buf);
923 cifs_dump_mids(server);
924 #endif /* CIFS_DEBUG2 */
925
926 }
927 } /* end while !EXITING */
928
929 /* buffer usually freed in free_mid - need to free it here on exit */
930 cifs_buf_release(server->bigbuf);
931 if (server->smallbuf) /* no sense logging a debug message if NULL */
932 cifs_small_buf_release(server->smallbuf);
933
934 task_to_wake = xchg(&server->tsk, NULL);
935 clean_demultiplex_info(server);
936
937 /* if server->tsk was NULL then wait for a signal before exiting */
938 if (!task_to_wake) {
939 set_current_state(TASK_INTERRUPTIBLE);
940 while (!signal_pending(current)) {
941 schedule();
942 set_current_state(TASK_INTERRUPTIBLE);
943 }
944 set_current_state(TASK_RUNNING);
945 }
946
947 module_put_and_exit(0);
948 }
949
950 /* extract the host portion of the UNC string */
951 static char *
952 extract_hostname(const char *unc)
953 {
954 const char *src;
955 char *dst, *delim;
956 unsigned int len;
957
958 /* skip double chars at beginning of string */
959 /* BB: check validity of these bytes? */
960 src = unc + 2;
961
962 /* delimiter between hostname and sharename is always '\\' now */
963 delim = strchr(src, '\\');
964 if (!delim)
965 return ERR_PTR(-EINVAL);
966
967 len = delim - src;
968 dst = kmalloc((len + 1), GFP_KERNEL);
969 if (dst == NULL)
970 return ERR_PTR(-ENOMEM);
971
972 memcpy(dst, src, len);
973 dst[len] = '\0';
974
975 return dst;
976 }
977
978 static int get_option_ul(substring_t args[], unsigned long *option)
979 {
980 int rc;
981 char *string;
982
983 string = match_strdup(args);
984 if (string == NULL)
985 return -ENOMEM;
986 rc = kstrtoul(string, 0, option);
987 kfree(string);
988
989 return rc;
990 }
991
992 static int get_option_uid(substring_t args[], kuid_t *result)
993 {
994 unsigned long value;
995 kuid_t uid;
996 int rc;
997
998 rc = get_option_ul(args, &value);
999 if (rc)
1000 return rc;
1001
1002 uid = make_kuid(current_user_ns(), value);
1003 if (!uid_valid(uid))
1004 return -EINVAL;
1005
1006 *result = uid;
1007 return 0;
1008 }
1009
1010 static int get_option_gid(substring_t args[], kgid_t *result)
1011 {
1012 unsigned long value;
1013 kgid_t gid;
1014 int rc;
1015
1016 rc = get_option_ul(args, &value);
1017 if (rc)
1018 return rc;
1019
1020 gid = make_kgid(current_user_ns(), value);
1021 if (!gid_valid(gid))
1022 return -EINVAL;
1023
1024 *result = gid;
1025 return 0;
1026 }
1027
1028 static int cifs_parse_security_flavors(char *value,
1029 struct smb_vol *vol)
1030 {
1031
1032 substring_t args[MAX_OPT_ARGS];
1033
1034 /*
1035 * With mount options, the last one should win. Reset any existing
1036 * settings back to default.
1037 */
1038 vol->sectype = Unspecified;
1039 vol->sign = false;
1040
1041 switch (match_token(value, cifs_secflavor_tokens, args)) {
1042 case Opt_sec_krb5p:
1043 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1044 return 1;
1045 case Opt_sec_krb5i:
1046 vol->sign = true;
1047 /* Fallthrough */
1048 case Opt_sec_krb5:
1049 vol->sectype = Kerberos;
1050 break;
1051 case Opt_sec_ntlmsspi:
1052 vol->sign = true;
1053 /* Fallthrough */
1054 case Opt_sec_ntlmssp:
1055 vol->sectype = RawNTLMSSP;
1056 break;
1057 case Opt_sec_ntlmi:
1058 vol->sign = true;
1059 /* Fallthrough */
1060 case Opt_ntlm:
1061 vol->sectype = NTLM;
1062 break;
1063 case Opt_sec_ntlmv2i:
1064 vol->sign = true;
1065 /* Fallthrough */
1066 case Opt_sec_ntlmv2:
1067 vol->sectype = NTLMv2;
1068 break;
1069 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1070 case Opt_sec_lanman:
1071 vol->sectype = LANMAN;
1072 break;
1073 #endif
1074 case Opt_sec_none:
1075 vol->nullauth = 1;
1076 break;
1077 default:
1078 cifs_dbg(VFS, "bad security option: %s\n", value);
1079 return 1;
1080 }
1081
1082 return 0;
1083 }
1084
1085 static int
1086 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1087 {
1088 substring_t args[MAX_OPT_ARGS];
1089
1090 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1091 case Opt_cache_loose:
1092 vol->direct_io = false;
1093 vol->strict_io = false;
1094 break;
1095 case Opt_cache_strict:
1096 vol->direct_io = false;
1097 vol->strict_io = true;
1098 break;
1099 case Opt_cache_none:
1100 vol->direct_io = true;
1101 vol->strict_io = false;
1102 break;
1103 default:
1104 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1105 return 1;
1106 }
1107 return 0;
1108 }
1109
1110 static int
1111 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1112 {
1113 substring_t args[MAX_OPT_ARGS];
1114
1115 switch (match_token(value, cifs_smb_version_tokens, args)) {
1116 case Smb_1:
1117 vol->ops = &smb1_operations;
1118 vol->vals = &smb1_values;
1119 break;
1120 #ifdef CONFIG_CIFS_SMB2
1121 case Smb_20:
1122 vol->ops = &smb20_operations;
1123 vol->vals = &smb20_values;
1124 break;
1125 case Smb_21:
1126 vol->ops = &smb21_operations;
1127 vol->vals = &smb21_values;
1128 break;
1129 case Smb_30:
1130 vol->ops = &smb30_operations;
1131 vol->vals = &smb30_values;
1132 break;
1133 case Smb_302:
1134 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1135 vol->vals = &smb302_values;
1136 break;
1137 #endif
1138 default:
1139 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1140 return 1;
1141 }
1142 return 0;
1143 }
1144
1145 /*
1146 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1147 * fields with the result. Returns 0 on success and an error otherwise.
1148 */
1149 static int
1150 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1151 {
1152 char *pos;
1153 const char *delims = "/\\";
1154 size_t len;
1155
1156 /* make sure we have a valid UNC double delimiter prefix */
1157 len = strspn(devname, delims);
1158 if (len != 2)
1159 return -EINVAL;
1160
1161 /* find delimiter between host and sharename */
1162 pos = strpbrk(devname + 2, delims);
1163 if (!pos)
1164 return -EINVAL;
1165
1166 /* skip past delimiter */
1167 ++pos;
1168
1169 /* now go until next delimiter or end of string */
1170 len = strcspn(pos, delims);
1171
1172 /* move "pos" up to delimiter or NULL */
1173 pos += len;
1174 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1175 if (!vol->UNC)
1176 return -ENOMEM;
1177
1178 convert_delimiter(vol->UNC, '\\');
1179
1180 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1181 if (!*pos++ || !*pos)
1182 return 0;
1183
1184 vol->prepath = kstrdup(pos, GFP_KERNEL);
1185 if (!vol->prepath)
1186 return -ENOMEM;
1187
1188 return 0;
1189 }
1190
1191 static int
1192 cifs_parse_mount_options(const char *mountdata, const char *devname,
1193 struct smb_vol *vol)
1194 {
1195 char *data, *end;
1196 char *mountdata_copy = NULL, *options;
1197 unsigned int temp_len, i, j;
1198 char separator[2];
1199 short int override_uid = -1;
1200 short int override_gid = -1;
1201 bool uid_specified = false;
1202 bool gid_specified = false;
1203 bool sloppy = false;
1204 char *invalid = NULL;
1205 char *nodename = utsname()->nodename;
1206 char *string = NULL;
1207 char *tmp_end, *value;
1208 char delim;
1209 bool got_ip = false;
1210 unsigned short port = 0;
1211 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1212
1213 separator[0] = ',';
1214 separator[1] = 0;
1215 delim = separator[0];
1216
1217 /* ensure we always start with zeroed-out smb_vol */
1218 memset(vol, 0, sizeof(*vol));
1219
1220 /*
1221 * does not have to be perfect mapping since field is
1222 * informational, only used for servers that do not support
1223 * port 445 and it can be overridden at mount time
1224 */
1225 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1226 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1227 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1228
1229 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1230 /* null target name indicates to use *SMBSERVR default called name
1231 if we end up sending RFC1001 session initialize */
1232 vol->target_rfc1001_name[0] = 0;
1233 vol->cred_uid = current_uid();
1234 vol->linux_uid = current_uid();
1235 vol->linux_gid = current_gid();
1236
1237 /*
1238 * default to SFM style remapping of seven reserved characters
1239 * unless user overrides it or we negotiate CIFS POSIX where
1240 * it is unnecessary. Can not simultaneously use more than one mapping
1241 * since then readdir could list files that open could not open
1242 */
1243 vol->remap = true;
1244
1245 /* default to only allowing write access to owner of the mount */
1246 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1247
1248 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1249 /* default is always to request posix paths. */
1250 vol->posix_paths = 1;
1251 /* default to using server inode numbers where available */
1252 vol->server_ino = 1;
1253
1254 /* default is to use strict cifs caching semantics */
1255 vol->strict_io = true;
1256
1257 vol->actimeo = CIFS_DEF_ACTIMEO;
1258
1259 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1260 vol->ops = &smb1_operations;
1261 vol->vals = &smb1_values;
1262
1263 if (!mountdata)
1264 goto cifs_parse_mount_err;
1265
1266 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1267 if (!mountdata_copy)
1268 goto cifs_parse_mount_err;
1269
1270 options = mountdata_copy;
1271 end = options + strlen(options);
1272
1273 if (strncmp(options, "sep=", 4) == 0) {
1274 if (options[4] != 0) {
1275 separator[0] = options[4];
1276 options += 5;
1277 } else {
1278 cifs_dbg(FYI, "Null separator not allowed\n");
1279 }
1280 }
1281 vol->backupuid_specified = false; /* no backup intent for a user */
1282 vol->backupgid_specified = false; /* no backup intent for a group */
1283
1284 switch (cifs_parse_devname(devname, vol)) {
1285 case 0:
1286 break;
1287 case -ENOMEM:
1288 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1289 goto cifs_parse_mount_err;
1290 case -EINVAL:
1291 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1292 goto cifs_parse_mount_err;
1293 default:
1294 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1295 goto cifs_parse_mount_err;
1296 }
1297
1298 while ((data = strsep(&options, separator)) != NULL) {
1299 substring_t args[MAX_OPT_ARGS];
1300 unsigned long option;
1301 int token;
1302
1303 if (!*data)
1304 continue;
1305
1306 token = match_token(data, cifs_mount_option_tokens, args);
1307
1308 switch (token) {
1309
1310 /* Ingnore the following */
1311 case Opt_ignore:
1312 break;
1313
1314 /* Boolean values */
1315 case Opt_user_xattr:
1316 vol->no_xattr = 0;
1317 break;
1318 case Opt_nouser_xattr:
1319 vol->no_xattr = 1;
1320 break;
1321 case Opt_forceuid:
1322 override_uid = 1;
1323 break;
1324 case Opt_noforceuid:
1325 override_uid = 0;
1326 break;
1327 case Opt_forcegid:
1328 override_gid = 1;
1329 break;
1330 case Opt_noforcegid:
1331 override_gid = 0;
1332 break;
1333 case Opt_noblocksend:
1334 vol->noblocksnd = 1;
1335 break;
1336 case Opt_noautotune:
1337 vol->noautotune = 1;
1338 break;
1339 case Opt_hard:
1340 vol->retry = 1;
1341 break;
1342 case Opt_soft:
1343 vol->retry = 0;
1344 break;
1345 case Opt_perm:
1346 vol->noperm = 0;
1347 break;
1348 case Opt_noperm:
1349 vol->noperm = 1;
1350 break;
1351 case Opt_mapchars:
1352 vol->sfu_remap = true;
1353 vol->remap = false; /* disable SFM mapping */
1354 break;
1355 case Opt_nomapchars:
1356 vol->sfu_remap = false;
1357 break;
1358 case Opt_mapposix:
1359 vol->remap = true;
1360 vol->sfu_remap = false; /* disable SFU mapping */
1361 break;
1362 case Opt_nomapposix:
1363 vol->remap = false;
1364 break;
1365 case Opt_sfu:
1366 vol->sfu_emul = 1;
1367 break;
1368 case Opt_nosfu:
1369 vol->sfu_emul = 0;
1370 break;
1371 case Opt_nodfs:
1372 vol->nodfs = 1;
1373 break;
1374 case Opt_posixpaths:
1375 vol->posix_paths = 1;
1376 break;
1377 case Opt_noposixpaths:
1378 vol->posix_paths = 0;
1379 break;
1380 case Opt_nounix:
1381 vol->no_linux_ext = 1;
1382 break;
1383 case Opt_nocase:
1384 vol->nocase = 1;
1385 break;
1386 case Opt_brl:
1387 vol->nobrl = 0;
1388 break;
1389 case Opt_nobrl:
1390 vol->nobrl = 1;
1391 /*
1392 * turn off mandatory locking in mode
1393 * if remote locking is turned off since the
1394 * local vfs will do advisory
1395 */
1396 if (vol->file_mode ==
1397 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1398 vol->file_mode = S_IALLUGO;
1399 break;
1400 case Opt_forcemandatorylock:
1401 vol->mand_lock = 1;
1402 break;
1403 case Opt_setuids:
1404 vol->setuids = 1;
1405 break;
1406 case Opt_nosetuids:
1407 vol->setuids = 0;
1408 break;
1409 case Opt_dynperm:
1410 vol->dynperm = true;
1411 break;
1412 case Opt_nodynperm:
1413 vol->dynperm = false;
1414 break;
1415 case Opt_nohard:
1416 vol->retry = 0;
1417 break;
1418 case Opt_nosoft:
1419 vol->retry = 1;
1420 break;
1421 case Opt_nointr:
1422 vol->intr = 0;
1423 break;
1424 case Opt_intr:
1425 vol->intr = 1;
1426 break;
1427 case Opt_nostrictsync:
1428 vol->nostrictsync = 1;
1429 break;
1430 case Opt_strictsync:
1431 vol->nostrictsync = 0;
1432 break;
1433 case Opt_serverino:
1434 vol->server_ino = 1;
1435 break;
1436 case Opt_noserverino:
1437 vol->server_ino = 0;
1438 break;
1439 case Opt_rwpidforward:
1440 vol->rwpidforward = 1;
1441 break;
1442 case Opt_cifsacl:
1443 vol->cifs_acl = 1;
1444 break;
1445 case Opt_nocifsacl:
1446 vol->cifs_acl = 0;
1447 break;
1448 case Opt_acl:
1449 vol->no_psx_acl = 0;
1450 break;
1451 case Opt_noacl:
1452 vol->no_psx_acl = 1;
1453 break;
1454 case Opt_locallease:
1455 vol->local_lease = 1;
1456 break;
1457 case Opt_sign:
1458 vol->sign = true;
1459 break;
1460 case Opt_seal:
1461 /* we do not do the following in secFlags because seal
1462 * is a per tree connection (mount) not a per socket
1463 * or per-smb connection option in the protocol
1464 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1465 */
1466 vol->seal = 1;
1467 break;
1468 case Opt_noac:
1469 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1470 break;
1471 case Opt_fsc:
1472 #ifndef CONFIG_CIFS_FSCACHE
1473 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1474 goto cifs_parse_mount_err;
1475 #endif
1476 vol->fsc = true;
1477 break;
1478 case Opt_mfsymlinks:
1479 vol->mfsymlinks = true;
1480 break;
1481 case Opt_multiuser:
1482 vol->multiuser = true;
1483 break;
1484 case Opt_sloppy:
1485 sloppy = true;
1486 break;
1487 case Opt_nosharesock:
1488 vol->nosharesock = true;
1489 break;
1490
1491 /* Numeric Values */
1492 case Opt_backupuid:
1493 if (get_option_uid(args, &vol->backupuid)) {
1494 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1495 __func__);
1496 goto cifs_parse_mount_err;
1497 }
1498 vol->backupuid_specified = true;
1499 break;
1500 case Opt_backupgid:
1501 if (get_option_gid(args, &vol->backupgid)) {
1502 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1503 __func__);
1504 goto cifs_parse_mount_err;
1505 }
1506 vol->backupgid_specified = true;
1507 break;
1508 case Opt_uid:
1509 if (get_option_uid(args, &vol->linux_uid)) {
1510 cifs_dbg(VFS, "%s: Invalid uid value\n",
1511 __func__);
1512 goto cifs_parse_mount_err;
1513 }
1514 uid_specified = true;
1515 break;
1516 case Opt_cruid:
1517 if (get_option_uid(args, &vol->cred_uid)) {
1518 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1519 __func__);
1520 goto cifs_parse_mount_err;
1521 }
1522 break;
1523 case Opt_gid:
1524 if (get_option_gid(args, &vol->linux_gid)) {
1525 cifs_dbg(VFS, "%s: Invalid gid value\n",
1526 __func__);
1527 goto cifs_parse_mount_err;
1528 }
1529 gid_specified = true;
1530 break;
1531 case Opt_file_mode:
1532 if (get_option_ul(args, &option)) {
1533 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 vol->file_mode = option;
1538 break;
1539 case Opt_dirmode:
1540 if (get_option_ul(args, &option)) {
1541 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 vol->dir_mode = option;
1546 break;
1547 case Opt_port:
1548 if (get_option_ul(args, &option) ||
1549 option > USHRT_MAX) {
1550 cifs_dbg(VFS, "%s: Invalid port value\n",
1551 __func__);
1552 goto cifs_parse_mount_err;
1553 }
1554 port = (unsigned short)option;
1555 break;
1556 case Opt_rsize:
1557 if (get_option_ul(args, &option)) {
1558 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1559 __func__);
1560 goto cifs_parse_mount_err;
1561 }
1562 vol->rsize = option;
1563 break;
1564 case Opt_wsize:
1565 if (get_option_ul(args, &option)) {
1566 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1567 __func__);
1568 goto cifs_parse_mount_err;
1569 }
1570 vol->wsize = option;
1571 break;
1572 case Opt_actimeo:
1573 if (get_option_ul(args, &option)) {
1574 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1575 __func__);
1576 goto cifs_parse_mount_err;
1577 }
1578 vol->actimeo = HZ * option;
1579 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1580 cifs_dbg(VFS, "attribute cache timeout too large\n");
1581 goto cifs_parse_mount_err;
1582 }
1583 break;
1584
1585 /* String Arguments */
1586
1587 case Opt_blank_user:
1588 /* null user, ie. anonymous authentication */
1589 vol->nullauth = 1;
1590 vol->username = NULL;
1591 break;
1592 case Opt_user:
1593 string = match_strdup(args);
1594 if (string == NULL)
1595 goto out_nomem;
1596
1597 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1598 CIFS_MAX_USERNAME_LEN) {
1599 pr_warn("CIFS: username too long\n");
1600 goto cifs_parse_mount_err;
1601 }
1602
1603 kfree(vol->username);
1604 vol->username = kstrdup(string, GFP_KERNEL);
1605 if (!vol->username)
1606 goto cifs_parse_mount_err;
1607 break;
1608 case Opt_blank_pass:
1609 /* passwords have to be handled differently
1610 * to allow the character used for deliminator
1611 * to be passed within them
1612 */
1613
1614 /*
1615 * Check if this is a case where the password
1616 * starts with a delimiter
1617 */
1618 tmp_end = strchr(data, '=');
1619 tmp_end++;
1620 if (!(tmp_end < end && tmp_end[1] == delim)) {
1621 /* No it is not. Set the password to NULL */
1622 kfree(vol->password);
1623 vol->password = NULL;
1624 break;
1625 }
1626 /* Yes it is. Drop down to Opt_pass below.*/
1627 case Opt_pass:
1628 /* Obtain the value string */
1629 value = strchr(data, '=');
1630 value++;
1631
1632 /* Set tmp_end to end of the string */
1633 tmp_end = (char *) value + strlen(value);
1634
1635 /* Check if following character is the deliminator
1636 * If yes, we have encountered a double deliminator
1637 * reset the NULL character to the deliminator
1638 */
1639 if (tmp_end < end && tmp_end[1] == delim) {
1640 tmp_end[0] = delim;
1641
1642 /* Keep iterating until we get to a single
1643 * deliminator OR the end
1644 */
1645 while ((tmp_end = strchr(tmp_end, delim))
1646 != NULL && (tmp_end[1] == delim)) {
1647 tmp_end = (char *) &tmp_end[2];
1648 }
1649
1650 /* Reset var options to point to next element */
1651 if (tmp_end) {
1652 tmp_end[0] = '\0';
1653 options = (char *) &tmp_end[1];
1654 } else
1655 /* Reached the end of the mount option
1656 * string */
1657 options = end;
1658 }
1659
1660 kfree(vol->password);
1661 /* Now build new password string */
1662 temp_len = strlen(value);
1663 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1664 if (vol->password == NULL) {
1665 pr_warn("CIFS: no memory for password\n");
1666 goto cifs_parse_mount_err;
1667 }
1668
1669 for (i = 0, j = 0; i < temp_len; i++, j++) {
1670 vol->password[j] = value[i];
1671 if ((value[i] == delim) &&
1672 value[i+1] == delim)
1673 /* skip the second deliminator */
1674 i++;
1675 }
1676 vol->password[j] = '\0';
1677 break;
1678 case Opt_blank_ip:
1679 /* FIXME: should this be an error instead? */
1680 got_ip = false;
1681 break;
1682 case Opt_ip:
1683 string = match_strdup(args);
1684 if (string == NULL)
1685 goto out_nomem;
1686
1687 if (!cifs_convert_address(dstaddr, string,
1688 strlen(string))) {
1689 pr_err("CIFS: bad ip= option (%s).\n", string);
1690 goto cifs_parse_mount_err;
1691 }
1692 got_ip = true;
1693 break;
1694 case Opt_domain:
1695 string = match_strdup(args);
1696 if (string == NULL)
1697 goto out_nomem;
1698
1699 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1700 == CIFS_MAX_DOMAINNAME_LEN) {
1701 pr_warn("CIFS: domain name too long\n");
1702 goto cifs_parse_mount_err;
1703 }
1704
1705 kfree(vol->domainname);
1706 vol->domainname = kstrdup(string, GFP_KERNEL);
1707 if (!vol->domainname) {
1708 pr_warn("CIFS: no memory for domainname\n");
1709 goto cifs_parse_mount_err;
1710 }
1711 cifs_dbg(FYI, "Domain name set\n");
1712 break;
1713 case Opt_srcaddr:
1714 string = match_strdup(args);
1715 if (string == NULL)
1716 goto out_nomem;
1717
1718 if (!cifs_convert_address(
1719 (struct sockaddr *)&vol->srcaddr,
1720 string, strlen(string))) {
1721 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1722 string);
1723 goto cifs_parse_mount_err;
1724 }
1725 break;
1726 case Opt_iocharset:
1727 string = match_strdup(args);
1728 if (string == NULL)
1729 goto out_nomem;
1730
1731 if (strnlen(string, 1024) >= 65) {
1732 pr_warn("CIFS: iocharset name too long.\n");
1733 goto cifs_parse_mount_err;
1734 }
1735
1736 if (strncasecmp(string, "default", 7) != 0) {
1737 kfree(vol->iocharset);
1738 vol->iocharset = kstrdup(string,
1739 GFP_KERNEL);
1740 if (!vol->iocharset) {
1741 pr_warn("CIFS: no memory for charset\n");
1742 goto cifs_parse_mount_err;
1743 }
1744 }
1745 /* if iocharset not set then load_nls_default
1746 * is used by caller
1747 */
1748 cifs_dbg(FYI, "iocharset set to %s\n", string);
1749 break;
1750 case Opt_netbiosname:
1751 string = match_strdup(args);
1752 if (string == NULL)
1753 goto out_nomem;
1754
1755 memset(vol->source_rfc1001_name, 0x20,
1756 RFC1001_NAME_LEN);
1757 /*
1758 * FIXME: are there cases in which a comma can
1759 * be valid in workstation netbios name (and
1760 * need special handling)?
1761 */
1762 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1763 /* don't ucase netbiosname for user */
1764 if (string[i] == 0)
1765 break;
1766 vol->source_rfc1001_name[i] = string[i];
1767 }
1768 /* The string has 16th byte zero still from
1769 * set at top of the function
1770 */
1771 if (i == RFC1001_NAME_LEN && string[i] != 0)
1772 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1773 break;
1774 case Opt_servern:
1775 /* servernetbiosname specified override *SMBSERVER */
1776 string = match_strdup(args);
1777 if (string == NULL)
1778 goto out_nomem;
1779
1780 /* last byte, type, is 0x20 for servr type */
1781 memset(vol->target_rfc1001_name, 0x20,
1782 RFC1001_NAME_LEN_WITH_NULL);
1783
1784 /* BB are there cases in which a comma can be
1785 valid in this workstation netbios name
1786 (and need special handling)? */
1787
1788 /* user or mount helper must uppercase the
1789 netbios name */
1790 for (i = 0; i < 15; i++) {
1791 if (string[i] == 0)
1792 break;
1793 vol->target_rfc1001_name[i] = string[i];
1794 }
1795 /* The string has 16th byte zero still from
1796 set at top of the function */
1797 if (i == RFC1001_NAME_LEN && string[i] != 0)
1798 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1799 break;
1800 case Opt_ver:
1801 string = match_strdup(args);
1802 if (string == NULL)
1803 goto out_nomem;
1804
1805 if (strncasecmp(string, "1", 1) == 0) {
1806 /* This is the default */
1807 break;
1808 }
1809 /* For all other value, error */
1810 pr_warn("CIFS: Invalid version specified\n");
1811 goto cifs_parse_mount_err;
1812 case Opt_vers:
1813 string = match_strdup(args);
1814 if (string == NULL)
1815 goto out_nomem;
1816
1817 if (cifs_parse_smb_version(string, vol) != 0)
1818 goto cifs_parse_mount_err;
1819 break;
1820 case Opt_sec:
1821 string = match_strdup(args);
1822 if (string == NULL)
1823 goto out_nomem;
1824
1825 if (cifs_parse_security_flavors(string, vol) != 0)
1826 goto cifs_parse_mount_err;
1827 break;
1828 case Opt_cache:
1829 string = match_strdup(args);
1830 if (string == NULL)
1831 goto out_nomem;
1832
1833 if (cifs_parse_cache_flavor(string, vol) != 0)
1834 goto cifs_parse_mount_err;
1835 break;
1836 default:
1837 /*
1838 * An option we don't recognize. Save it off for later
1839 * if we haven't already found one
1840 */
1841 if (!invalid)
1842 invalid = data;
1843 break;
1844 }
1845 /* Free up any allocated string */
1846 kfree(string);
1847 string = NULL;
1848 }
1849
1850 if (!sloppy && invalid) {
1851 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1852 goto cifs_parse_mount_err;
1853 }
1854
1855 #ifndef CONFIG_KEYS
1856 /* Muliuser mounts require CONFIG_KEYS support */
1857 if (vol->multiuser) {
1858 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1859 goto cifs_parse_mount_err;
1860 }
1861 #endif
1862 if (!vol->UNC) {
1863 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1864 goto cifs_parse_mount_err;
1865 }
1866
1867 /* make sure UNC has a share name */
1868 if (!strchr(vol->UNC + 3, '\\')) {
1869 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1870 goto cifs_parse_mount_err;
1871 }
1872
1873 if (!got_ip) {
1874 /* No ip= option specified? Try to get it from UNC */
1875 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1876 strlen(&vol->UNC[2]))) {
1877 pr_err("Unable to determine destination address.\n");
1878 goto cifs_parse_mount_err;
1879 }
1880 }
1881
1882 /* set the port that we got earlier */
1883 cifs_set_port(dstaddr, port);
1884
1885 if (uid_specified)
1886 vol->override_uid = override_uid;
1887 else if (override_uid == 1)
1888 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1889
1890 if (gid_specified)
1891 vol->override_gid = override_gid;
1892 else if (override_gid == 1)
1893 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1894
1895 kfree(mountdata_copy);
1896 return 0;
1897
1898 out_nomem:
1899 pr_warn("Could not allocate temporary buffer\n");
1900 cifs_parse_mount_err:
1901 kfree(string);
1902 kfree(mountdata_copy);
1903 return 1;
1904 }
1905
1906 /** Returns true if srcaddr isn't specified and rhs isn't
1907 * specified, or if srcaddr is specified and
1908 * matches the IP address of the rhs argument.
1909 */
1910 static bool
1911 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1912 {
1913 switch (srcaddr->sa_family) {
1914 case AF_UNSPEC:
1915 return (rhs->sa_family == AF_UNSPEC);
1916 case AF_INET: {
1917 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1918 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1919 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1920 }
1921 case AF_INET6: {
1922 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1923 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1924 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1925 }
1926 default:
1927 WARN_ON(1);
1928 return false; /* don't expect to be here */
1929 }
1930 }
1931
1932 /*
1933 * If no port is specified in addr structure, we try to match with 445 port
1934 * and if it fails - with 139 ports. It should be called only if address
1935 * families of server and addr are equal.
1936 */
1937 static bool
1938 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1939 {
1940 __be16 port, *sport;
1941
1942 switch (addr->sa_family) {
1943 case AF_INET:
1944 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1945 port = ((struct sockaddr_in *) addr)->sin_port;
1946 break;
1947 case AF_INET6:
1948 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1949 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1950 break;
1951 default:
1952 WARN_ON(1);
1953 return false;
1954 }
1955
1956 if (!port) {
1957 port = htons(CIFS_PORT);
1958 if (port == *sport)
1959 return true;
1960
1961 port = htons(RFC1001_PORT);
1962 }
1963
1964 return port == *sport;
1965 }
1966
1967 static bool
1968 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1969 struct sockaddr *srcaddr)
1970 {
1971 switch (addr->sa_family) {
1972 case AF_INET: {
1973 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1974 struct sockaddr_in *srv_addr4 =
1975 (struct sockaddr_in *)&server->dstaddr;
1976
1977 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1978 return false;
1979 break;
1980 }
1981 case AF_INET6: {
1982 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1983 struct sockaddr_in6 *srv_addr6 =
1984 (struct sockaddr_in6 *)&server->dstaddr;
1985
1986 if (!ipv6_addr_equal(&addr6->sin6_addr,
1987 &srv_addr6->sin6_addr))
1988 return false;
1989 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1990 return false;
1991 break;
1992 }
1993 default:
1994 WARN_ON(1);
1995 return false; /* don't expect to be here */
1996 }
1997
1998 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1999 return false;
2000
2001 return true;
2002 }
2003
2004 static bool
2005 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2006 {
2007 /*
2008 * The select_sectype function should either return the vol->sectype
2009 * that was specified, or "Unspecified" if that sectype was not
2010 * compatible with the given NEGOTIATE request.
2011 */
2012 if (select_sectype(server, vol->sectype) == Unspecified)
2013 return false;
2014
2015 /*
2016 * Now check if signing mode is acceptable. No need to check
2017 * global_secflags at this point since if MUST_SIGN is set then
2018 * the server->sign had better be too.
2019 */
2020 if (vol->sign && !server->sign)
2021 return false;
2022
2023 return true;
2024 }
2025
2026 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2027 {
2028 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2029
2030 if (vol->nosharesock)
2031 return 0;
2032
2033 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2034 return 0;
2035
2036 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2037 return 0;
2038
2039 if (!match_address(server, addr,
2040 (struct sockaddr *)&vol->srcaddr))
2041 return 0;
2042
2043 if (!match_port(server, addr))
2044 return 0;
2045
2046 if (!match_security(server, vol))
2047 return 0;
2048
2049 return 1;
2050 }
2051
2052 static struct TCP_Server_Info *
2053 cifs_find_tcp_session(struct smb_vol *vol)
2054 {
2055 struct TCP_Server_Info *server;
2056
2057 spin_lock(&cifs_tcp_ses_lock);
2058 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2059 if (!match_server(server, vol))
2060 continue;
2061
2062 ++server->srv_count;
2063 spin_unlock(&cifs_tcp_ses_lock);
2064 cifs_dbg(FYI, "Existing tcp session with server found\n");
2065 return server;
2066 }
2067 spin_unlock(&cifs_tcp_ses_lock);
2068 return NULL;
2069 }
2070
2071 static void
2072 cifs_put_tcp_session(struct TCP_Server_Info *server)
2073 {
2074 struct task_struct *task;
2075
2076 spin_lock(&cifs_tcp_ses_lock);
2077 if (--server->srv_count > 0) {
2078 spin_unlock(&cifs_tcp_ses_lock);
2079 return;
2080 }
2081
2082 put_net(cifs_net_ns(server));
2083
2084 list_del_init(&server->tcp_ses_list);
2085 spin_unlock(&cifs_tcp_ses_lock);
2086
2087 cancel_delayed_work_sync(&server->echo);
2088
2089 spin_lock(&GlobalMid_Lock);
2090 server->tcpStatus = CifsExiting;
2091 spin_unlock(&GlobalMid_Lock);
2092
2093 cifs_crypto_shash_release(server);
2094 cifs_fscache_release_client_cookie(server);
2095
2096 kfree(server->session_key.response);
2097 server->session_key.response = NULL;
2098 server->session_key.len = 0;
2099
2100 task = xchg(&server->tsk, NULL);
2101 if (task)
2102 force_sig(SIGKILL, task);
2103 }
2104
2105 static struct TCP_Server_Info *
2106 cifs_get_tcp_session(struct smb_vol *volume_info)
2107 {
2108 struct TCP_Server_Info *tcp_ses = NULL;
2109 int rc;
2110
2111 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2112
2113 /* see if we already have a matching tcp_ses */
2114 tcp_ses = cifs_find_tcp_session(volume_info);
2115 if (tcp_ses)
2116 return tcp_ses;
2117
2118 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2119 if (!tcp_ses) {
2120 rc = -ENOMEM;
2121 goto out_err;
2122 }
2123
2124 tcp_ses->ops = volume_info->ops;
2125 tcp_ses->vals = volume_info->vals;
2126 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2127 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2128 if (IS_ERR(tcp_ses->hostname)) {
2129 rc = PTR_ERR(tcp_ses->hostname);
2130 goto out_err_crypto_release;
2131 }
2132
2133 tcp_ses->noblocksnd = volume_info->noblocksnd;
2134 tcp_ses->noautotune = volume_info->noautotune;
2135 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2136 tcp_ses->in_flight = 0;
2137 tcp_ses->credits = 1;
2138 init_waitqueue_head(&tcp_ses->response_q);
2139 init_waitqueue_head(&tcp_ses->request_q);
2140 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2141 mutex_init(&tcp_ses->srv_mutex);
2142 memcpy(tcp_ses->workstation_RFC1001_name,
2143 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2144 memcpy(tcp_ses->server_RFC1001_name,
2145 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2146 tcp_ses->session_estab = false;
2147 tcp_ses->sequence_number = 0;
2148 tcp_ses->lstrp = jiffies;
2149 spin_lock_init(&tcp_ses->req_lock);
2150 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2151 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2152 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2153 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2154 sizeof(tcp_ses->srcaddr));
2155 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2156 sizeof(tcp_ses->dstaddr));
2157 #ifdef CONFIG_CIFS_SMB2
2158 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2159 #endif
2160 /*
2161 * at this point we are the only ones with the pointer
2162 * to the struct since the kernel thread not created yet
2163 * no need to spinlock this init of tcpStatus or srv_count
2164 */
2165 tcp_ses->tcpStatus = CifsNew;
2166 ++tcp_ses->srv_count;
2167
2168 rc = ip_connect(tcp_ses);
2169 if (rc < 0) {
2170 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2171 goto out_err_crypto_release;
2172 }
2173
2174 /*
2175 * since we're in a cifs function already, we know that
2176 * this will succeed. No need for try_module_get().
2177 */
2178 __module_get(THIS_MODULE);
2179 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2180 tcp_ses, "cifsd");
2181 if (IS_ERR(tcp_ses->tsk)) {
2182 rc = PTR_ERR(tcp_ses->tsk);
2183 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2184 module_put(THIS_MODULE);
2185 goto out_err_crypto_release;
2186 }
2187 tcp_ses->tcpStatus = CifsNeedNegotiate;
2188
2189 /* thread spawned, put it on the list */
2190 spin_lock(&cifs_tcp_ses_lock);
2191 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2192 spin_unlock(&cifs_tcp_ses_lock);
2193
2194 cifs_fscache_get_client_cookie(tcp_ses);
2195
2196 /* queue echo request delayed work */
2197 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2198
2199 return tcp_ses;
2200
2201 out_err_crypto_release:
2202 cifs_crypto_shash_release(tcp_ses);
2203
2204 put_net(cifs_net_ns(tcp_ses));
2205
2206 out_err:
2207 if (tcp_ses) {
2208 if (!IS_ERR(tcp_ses->hostname))
2209 kfree(tcp_ses->hostname);
2210 if (tcp_ses->ssocket)
2211 sock_release(tcp_ses->ssocket);
2212 kfree(tcp_ses);
2213 }
2214 return ERR_PTR(rc);
2215 }
2216
2217 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2218 {
2219 if (vol->sectype != Unspecified &&
2220 vol->sectype != ses->sectype)
2221 return 0;
2222
2223 switch (ses->sectype) {
2224 case Kerberos:
2225 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2226 return 0;
2227 break;
2228 default:
2229 /* NULL username means anonymous session */
2230 if (ses->user_name == NULL) {
2231 if (!vol->nullauth)
2232 return 0;
2233 break;
2234 }
2235
2236 /* anything else takes username/password */
2237 if (strncmp(ses->user_name,
2238 vol->username ? vol->username : "",
2239 CIFS_MAX_USERNAME_LEN))
2240 return 0;
2241 if ((vol->username && strlen(vol->username) != 0) &&
2242 ses->password != NULL &&
2243 strncmp(ses->password,
2244 vol->password ? vol->password : "",
2245 CIFS_MAX_PASSWORD_LEN))
2246 return 0;
2247 }
2248 return 1;
2249 }
2250
2251 static struct cifs_ses *
2252 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2253 {
2254 struct cifs_ses *ses;
2255
2256 spin_lock(&cifs_tcp_ses_lock);
2257 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2258 if (ses->status == CifsExiting)
2259 continue;
2260 if (!match_session(ses, vol))
2261 continue;
2262 ++ses->ses_count;
2263 spin_unlock(&cifs_tcp_ses_lock);
2264 return ses;
2265 }
2266 spin_unlock(&cifs_tcp_ses_lock);
2267 return NULL;
2268 }
2269
2270 static void
2271 cifs_put_smb_ses(struct cifs_ses *ses)
2272 {
2273 unsigned int rc, xid;
2274 struct TCP_Server_Info *server = ses->server;
2275
2276 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2277
2278 spin_lock(&cifs_tcp_ses_lock);
2279 if (ses->status == CifsExiting) {
2280 spin_unlock(&cifs_tcp_ses_lock);
2281 return;
2282 }
2283 if (--ses->ses_count > 0) {
2284 spin_unlock(&cifs_tcp_ses_lock);
2285 return;
2286 }
2287 if (ses->status == CifsGood)
2288 ses->status = CifsExiting;
2289 spin_unlock(&cifs_tcp_ses_lock);
2290
2291 if (ses->status == CifsExiting && server->ops->logoff) {
2292 xid = get_xid();
2293 rc = server->ops->logoff(xid, ses);
2294 if (rc)
2295 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2296 __func__, rc);
2297 _free_xid(xid);
2298 }
2299
2300 spin_lock(&cifs_tcp_ses_lock);
2301 list_del_init(&ses->smb_ses_list);
2302 spin_unlock(&cifs_tcp_ses_lock);
2303
2304 sesInfoFree(ses);
2305 cifs_put_tcp_session(server);
2306 }
2307
2308 #ifdef CONFIG_KEYS
2309
2310 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2311 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2312
2313 /* Populate username and pw fields from keyring if possible */
2314 static int
2315 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2316 {
2317 int rc = 0;
2318 char *desc, *delim, *payload;
2319 ssize_t len;
2320 struct key *key;
2321 struct TCP_Server_Info *server = ses->server;
2322 struct sockaddr_in *sa;
2323 struct sockaddr_in6 *sa6;
2324 struct user_key_payload *upayload;
2325
2326 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2327 if (!desc)
2328 return -ENOMEM;
2329
2330 /* try to find an address key first */
2331 switch (server->dstaddr.ss_family) {
2332 case AF_INET:
2333 sa = (struct sockaddr_in *)&server->dstaddr;
2334 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2335 break;
2336 case AF_INET6:
2337 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2338 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2339 break;
2340 default:
2341 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2342 server->dstaddr.ss_family);
2343 rc = -EINVAL;
2344 goto out_err;
2345 }
2346
2347 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2348 key = request_key(&key_type_logon, desc, "");
2349 if (IS_ERR(key)) {
2350 if (!ses->domainName) {
2351 cifs_dbg(FYI, "domainName is NULL\n");
2352 rc = PTR_ERR(key);
2353 goto out_err;
2354 }
2355
2356 /* didn't work, try to find a domain key */
2357 sprintf(desc, "cifs:d:%s", ses->domainName);
2358 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2359 key = request_key(&key_type_logon, desc, "");
2360 if (IS_ERR(key)) {
2361 rc = PTR_ERR(key);
2362 goto out_err;
2363 }
2364 }
2365
2366 down_read(&key->sem);
2367 upayload = key->payload.data;
2368 if (IS_ERR_OR_NULL(upayload)) {
2369 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2370 goto out_key_put;
2371 }
2372
2373 /* find first : in payload */
2374 payload = (char *)upayload->data;
2375 delim = strnchr(payload, upayload->datalen, ':');
2376 cifs_dbg(FYI, "payload=%s\n", payload);
2377 if (!delim) {
2378 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2379 upayload->datalen);
2380 rc = -EINVAL;
2381 goto out_key_put;
2382 }
2383
2384 len = delim - payload;
2385 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2386 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2387 len);
2388 rc = -EINVAL;
2389 goto out_key_put;
2390 }
2391
2392 vol->username = kstrndup(payload, len, GFP_KERNEL);
2393 if (!vol->username) {
2394 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2395 len);
2396 rc = -ENOMEM;
2397 goto out_key_put;
2398 }
2399 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2400
2401 len = key->datalen - (len + 1);
2402 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2403 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2404 rc = -EINVAL;
2405 kfree(vol->username);
2406 vol->username = NULL;
2407 goto out_key_put;
2408 }
2409
2410 ++delim;
2411 vol->password = kstrndup(delim, len, GFP_KERNEL);
2412 if (!vol->password) {
2413 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2414 len);
2415 rc = -ENOMEM;
2416 kfree(vol->username);
2417 vol->username = NULL;
2418 goto out_key_put;
2419 }
2420
2421 out_key_put:
2422 up_read(&key->sem);
2423 key_put(key);
2424 out_err:
2425 kfree(desc);
2426 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2427 return rc;
2428 }
2429 #else /* ! CONFIG_KEYS */
2430 static inline int
2431 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2432 struct cifs_ses *ses __attribute__((unused)))
2433 {
2434 return -ENOSYS;
2435 }
2436 #endif /* CONFIG_KEYS */
2437
2438 static struct cifs_ses *
2439 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2440 {
2441 int rc = -ENOMEM;
2442 unsigned int xid;
2443 struct cifs_ses *ses;
2444 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2445 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2446
2447 xid = get_xid();
2448
2449 ses = cifs_find_smb_ses(server, volume_info);
2450 if (ses) {
2451 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2452 ses->status);
2453
2454 mutex_lock(&ses->session_mutex);
2455 rc = cifs_negotiate_protocol(xid, ses);
2456 if (rc) {
2457 mutex_unlock(&ses->session_mutex);
2458 /* problem -- put our ses reference */
2459 cifs_put_smb_ses(ses);
2460 free_xid(xid);
2461 return ERR_PTR(rc);
2462 }
2463 if (ses->need_reconnect) {
2464 cifs_dbg(FYI, "Session needs reconnect\n");
2465 rc = cifs_setup_session(xid, ses,
2466 volume_info->local_nls);
2467 if (rc) {
2468 mutex_unlock(&ses->session_mutex);
2469 /* problem -- put our reference */
2470 cifs_put_smb_ses(ses);
2471 free_xid(xid);
2472 return ERR_PTR(rc);
2473 }
2474 }
2475 mutex_unlock(&ses->session_mutex);
2476
2477 /* existing SMB ses has a server reference already */
2478 cifs_put_tcp_session(server);
2479 free_xid(xid);
2480 return ses;
2481 }
2482
2483 cifs_dbg(FYI, "Existing smb sess not found\n");
2484 ses = sesInfoAlloc();
2485 if (ses == NULL)
2486 goto get_ses_fail;
2487
2488 /* new SMB session uses our server ref */
2489 ses->server = server;
2490 if (server->dstaddr.ss_family == AF_INET6)
2491 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2492 else
2493 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2494
2495 if (volume_info->username) {
2496 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2497 if (!ses->user_name)
2498 goto get_ses_fail;
2499 }
2500
2501 /* volume_info->password freed at unmount */
2502 if (volume_info->password) {
2503 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2504 if (!ses->password)
2505 goto get_ses_fail;
2506 }
2507 if (volume_info->domainname) {
2508 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2509 if (!ses->domainName)
2510 goto get_ses_fail;
2511 }
2512 ses->cred_uid = volume_info->cred_uid;
2513 ses->linux_uid = volume_info->linux_uid;
2514
2515 ses->sectype = volume_info->sectype;
2516 ses->sign = volume_info->sign;
2517
2518 mutex_lock(&ses->session_mutex);
2519 rc = cifs_negotiate_protocol(xid, ses);
2520 if (!rc)
2521 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2522 mutex_unlock(&ses->session_mutex);
2523 if (rc)
2524 goto get_ses_fail;
2525
2526 /* success, put it on the list */
2527 spin_lock(&cifs_tcp_ses_lock);
2528 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2529 spin_unlock(&cifs_tcp_ses_lock);
2530
2531 free_xid(xid);
2532 return ses;
2533
2534 get_ses_fail:
2535 sesInfoFree(ses);
2536 free_xid(xid);
2537 return ERR_PTR(rc);
2538 }
2539
2540 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2541 {
2542 if (tcon->tidStatus == CifsExiting)
2543 return 0;
2544 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2545 return 0;
2546 return 1;
2547 }
2548
2549 static struct cifs_tcon *
2550 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2551 {
2552 struct list_head *tmp;
2553 struct cifs_tcon *tcon;
2554
2555 spin_lock(&cifs_tcp_ses_lock);
2556 list_for_each(tmp, &ses->tcon_list) {
2557 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2558 if (!match_tcon(tcon, unc))
2559 continue;
2560 ++tcon->tc_count;
2561 spin_unlock(&cifs_tcp_ses_lock);
2562 return tcon;
2563 }
2564 spin_unlock(&cifs_tcp_ses_lock);
2565 return NULL;
2566 }
2567
2568 static void
2569 cifs_put_tcon(struct cifs_tcon *tcon)
2570 {
2571 unsigned int xid;
2572 struct cifs_ses *ses = tcon->ses;
2573
2574 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2575 spin_lock(&cifs_tcp_ses_lock);
2576 if (--tcon->tc_count > 0) {
2577 spin_unlock(&cifs_tcp_ses_lock);
2578 return;
2579 }
2580
2581 list_del_init(&tcon->tcon_list);
2582 spin_unlock(&cifs_tcp_ses_lock);
2583
2584 xid = get_xid();
2585 if (ses->server->ops->tree_disconnect)
2586 ses->server->ops->tree_disconnect(xid, tcon);
2587 _free_xid(xid);
2588
2589 cifs_fscache_release_super_cookie(tcon);
2590 tconInfoFree(tcon);
2591 cifs_put_smb_ses(ses);
2592 }
2593
2594 static struct cifs_tcon *
2595 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2596 {
2597 int rc, xid;
2598 struct cifs_tcon *tcon;
2599
2600 tcon = cifs_find_tcon(ses, volume_info->UNC);
2601 if (tcon) {
2602 cifs_dbg(FYI, "Found match on UNC path\n");
2603 /* existing tcon already has a reference */
2604 cifs_put_smb_ses(ses);
2605 if (tcon->seal != volume_info->seal)
2606 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2607 return tcon;
2608 }
2609
2610 if (!ses->server->ops->tree_connect) {
2611 rc = -ENOSYS;
2612 goto out_fail;
2613 }
2614
2615 tcon = tconInfoAlloc();
2616 if (tcon == NULL) {
2617 rc = -ENOMEM;
2618 goto out_fail;
2619 }
2620
2621 tcon->ses = ses;
2622 if (volume_info->password) {
2623 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2624 if (!tcon->password) {
2625 rc = -ENOMEM;
2626 goto out_fail;
2627 }
2628 }
2629
2630 /*
2631 * BB Do we need to wrap session_mutex around this TCon call and Unix
2632 * SetFS as we do on SessSetup and reconnect?
2633 */
2634 xid = get_xid();
2635 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2636 volume_info->local_nls);
2637 free_xid(xid);
2638 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2639 if (rc)
2640 goto out_fail;
2641
2642 if (volume_info->nodfs) {
2643 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2644 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2645 }
2646 tcon->seal = volume_info->seal;
2647 /*
2648 * We can have only one retry value for a connection to a share so for
2649 * resources mounted more than once to the same server share the last
2650 * value passed in for the retry flag is used.
2651 */
2652 tcon->retry = volume_info->retry;
2653 tcon->nocase = volume_info->nocase;
2654 tcon->local_lease = volume_info->local_lease;
2655 INIT_LIST_HEAD(&tcon->pending_opens);
2656
2657 spin_lock(&cifs_tcp_ses_lock);
2658 list_add(&tcon->tcon_list, &ses->tcon_list);
2659 spin_unlock(&cifs_tcp_ses_lock);
2660
2661 cifs_fscache_get_super_cookie(tcon);
2662
2663 return tcon;
2664
2665 out_fail:
2666 tconInfoFree(tcon);
2667 return ERR_PTR(rc);
2668 }
2669
2670 void
2671 cifs_put_tlink(struct tcon_link *tlink)
2672 {
2673 if (!tlink || IS_ERR(tlink))
2674 return;
2675
2676 if (!atomic_dec_and_test(&tlink->tl_count) ||
2677 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2678 tlink->tl_time = jiffies;
2679 return;
2680 }
2681
2682 if (!IS_ERR(tlink_tcon(tlink)))
2683 cifs_put_tcon(tlink_tcon(tlink));
2684 kfree(tlink);
2685 return;
2686 }
2687
2688 static inline struct tcon_link *
2689 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2690 {
2691 return cifs_sb->master_tlink;
2692 }
2693
2694 static int
2695 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2696 {
2697 struct cifs_sb_info *old = CIFS_SB(sb);
2698 struct cifs_sb_info *new = mnt_data->cifs_sb;
2699
2700 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2701 return 0;
2702
2703 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2704 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2705 return 0;
2706
2707 /*
2708 * We want to share sb only if we don't specify an r/wsize or
2709 * specified r/wsize is greater than or equal to existing one.
2710 */
2711 if (new->wsize && new->wsize < old->wsize)
2712 return 0;
2713
2714 if (new->rsize && new->rsize < old->rsize)
2715 return 0;
2716
2717 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2718 return 0;
2719
2720 if (old->mnt_file_mode != new->mnt_file_mode ||
2721 old->mnt_dir_mode != new->mnt_dir_mode)
2722 return 0;
2723
2724 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2725 return 0;
2726
2727 if (old->actimeo != new->actimeo)
2728 return 0;
2729
2730 return 1;
2731 }
2732
2733 int
2734 cifs_match_super(struct super_block *sb, void *data)
2735 {
2736 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2737 struct smb_vol *volume_info;
2738 struct cifs_sb_info *cifs_sb;
2739 struct TCP_Server_Info *tcp_srv;
2740 struct cifs_ses *ses;
2741 struct cifs_tcon *tcon;
2742 struct tcon_link *tlink;
2743 int rc = 0;
2744
2745 spin_lock(&cifs_tcp_ses_lock);
2746 cifs_sb = CIFS_SB(sb);
2747 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2748 if (IS_ERR(tlink)) {
2749 spin_unlock(&cifs_tcp_ses_lock);
2750 return rc;
2751 }
2752 tcon = tlink_tcon(tlink);
2753 ses = tcon->ses;
2754 tcp_srv = ses->server;
2755
2756 volume_info = mnt_data->vol;
2757
2758 if (!match_server(tcp_srv, volume_info) ||
2759 !match_session(ses, volume_info) ||
2760 !match_tcon(tcon, volume_info->UNC)) {
2761 rc = 0;
2762 goto out;
2763 }
2764
2765 rc = compare_mount_options(sb, mnt_data);
2766 out:
2767 spin_unlock(&cifs_tcp_ses_lock);
2768 cifs_put_tlink(tlink);
2769 return rc;
2770 }
2771
2772 int
2773 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2774 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2775 struct dfs_info3_param **referrals, int remap)
2776 {
2777 char *temp_unc;
2778 int rc = 0;
2779
2780 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2781 return -ENOSYS;
2782
2783 *num_referrals = 0;
2784 *referrals = NULL;
2785
2786 if (ses->ipc_tid == 0) {
2787 temp_unc = kmalloc(2 /* for slashes */ +
2788 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2789 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2790 if (temp_unc == NULL)
2791 return -ENOMEM;
2792 temp_unc[0] = '\\';
2793 temp_unc[1] = '\\';
2794 strcpy(temp_unc + 2, ses->serverName);
2795 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2796 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2797 nls_codepage);
2798 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2799 kfree(temp_unc);
2800 }
2801 if (rc == 0)
2802 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2803 referrals, num_referrals,
2804 nls_codepage, remap);
2805 /*
2806 * BB - map targetUNCs to dfs_info3 structures, here or in
2807 * ses->server->ops->get_dfs_refer.
2808 */
2809
2810 return rc;
2811 }
2812
2813 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2814 static struct lock_class_key cifs_key[2];
2815 static struct lock_class_key cifs_slock_key[2];
2816
2817 static inline void
2818 cifs_reclassify_socket4(struct socket *sock)
2819 {
2820 struct sock *sk = sock->sk;
2821 BUG_ON(sock_owned_by_user(sk));
2822 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2823 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2824 }
2825
2826 static inline void
2827 cifs_reclassify_socket6(struct socket *sock)
2828 {
2829 struct sock *sk = sock->sk;
2830 BUG_ON(sock_owned_by_user(sk));
2831 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2832 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2833 }
2834 #else
2835 static inline void
2836 cifs_reclassify_socket4(struct socket *sock)
2837 {
2838 }
2839
2840 static inline void
2841 cifs_reclassify_socket6(struct socket *sock)
2842 {
2843 }
2844 #endif
2845
2846 /* See RFC1001 section 14 on representation of Netbios names */
2847 static void rfc1002mangle(char *target, char *source, unsigned int length)
2848 {
2849 unsigned int i, j;
2850
2851 for (i = 0, j = 0; i < (length); i++) {
2852 /* mask a nibble at a time and encode */
2853 target[j] = 'A' + (0x0F & (source[i] >> 4));
2854 target[j+1] = 'A' + (0x0F & source[i]);
2855 j += 2;
2856 }
2857
2858 }
2859
2860 static int
2861 bind_socket(struct TCP_Server_Info *server)
2862 {
2863 int rc = 0;
2864 if (server->srcaddr.ss_family != AF_UNSPEC) {
2865 /* Bind to the specified local IP address */
2866 struct socket *socket = server->ssocket;
2867 rc = socket->ops->bind(socket,
2868 (struct sockaddr *) &server->srcaddr,
2869 sizeof(server->srcaddr));
2870 if (rc < 0) {
2871 struct sockaddr_in *saddr4;
2872 struct sockaddr_in6 *saddr6;
2873 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2874 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2875 if (saddr6->sin6_family == AF_INET6)
2876 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2877 &saddr6->sin6_addr, rc);
2878 else
2879 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2880 &saddr4->sin_addr.s_addr, rc);
2881 }
2882 }
2883 return rc;
2884 }
2885
2886 static int
2887 ip_rfc1001_connect(struct TCP_Server_Info *server)
2888 {
2889 int rc = 0;
2890 /*
2891 * some servers require RFC1001 sessinit before sending
2892 * negprot - BB check reconnection in case where second
2893 * sessinit is sent but no second negprot
2894 */
2895 struct rfc1002_session_packet *ses_init_buf;
2896 struct smb_hdr *smb_buf;
2897 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2898 GFP_KERNEL);
2899 if (ses_init_buf) {
2900 ses_init_buf->trailer.session_req.called_len = 32;
2901
2902 if (server->server_RFC1001_name &&
2903 server->server_RFC1001_name[0] != 0)
2904 rfc1002mangle(ses_init_buf->trailer.
2905 session_req.called_name,
2906 server->server_RFC1001_name,
2907 RFC1001_NAME_LEN_WITH_NULL);
2908 else
2909 rfc1002mangle(ses_init_buf->trailer.
2910 session_req.called_name,
2911 DEFAULT_CIFS_CALLED_NAME,
2912 RFC1001_NAME_LEN_WITH_NULL);
2913
2914 ses_init_buf->trailer.session_req.calling_len = 32;
2915
2916 /*
2917 * calling name ends in null (byte 16) from old smb
2918 * convention.
2919 */
2920 if (server->workstation_RFC1001_name[0] != 0)
2921 rfc1002mangle(ses_init_buf->trailer.
2922 session_req.calling_name,
2923 server->workstation_RFC1001_name,
2924 RFC1001_NAME_LEN_WITH_NULL);
2925 else
2926 rfc1002mangle(ses_init_buf->trailer.
2927 session_req.calling_name,
2928 "LINUX_CIFS_CLNT",
2929 RFC1001_NAME_LEN_WITH_NULL);
2930
2931 ses_init_buf->trailer.session_req.scope1 = 0;
2932 ses_init_buf->trailer.session_req.scope2 = 0;
2933 smb_buf = (struct smb_hdr *)ses_init_buf;
2934
2935 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2936 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2937 rc = smb_send(server, smb_buf, 0x44);
2938 kfree(ses_init_buf);
2939 /*
2940 * RFC1001 layer in at least one server
2941 * requires very short break before negprot
2942 * presumably because not expecting negprot
2943 * to follow so fast. This is a simple
2944 * solution that works without
2945 * complicating the code and causes no
2946 * significant slowing down on mount
2947 * for everyone else
2948 */
2949 usleep_range(1000, 2000);
2950 }
2951 /*
2952 * else the negprot may still work without this
2953 * even though malloc failed
2954 */
2955
2956 return rc;
2957 }
2958
2959 static int
2960 generic_ip_connect(struct TCP_Server_Info *server)
2961 {
2962 int rc = 0;
2963 __be16 sport;
2964 int slen, sfamily;
2965 struct socket *socket = server->ssocket;
2966 struct sockaddr *saddr;
2967
2968 saddr = (struct sockaddr *) &server->dstaddr;
2969
2970 if (server->dstaddr.ss_family == AF_INET6) {
2971 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2972 slen = sizeof(struct sockaddr_in6);
2973 sfamily = AF_INET6;
2974 } else {
2975 sport = ((struct sockaddr_in *) saddr)->sin_port;
2976 slen = sizeof(struct sockaddr_in);
2977 sfamily = AF_INET;
2978 }
2979
2980 if (socket == NULL) {
2981 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2982 IPPROTO_TCP, &socket, 1);
2983 if (rc < 0) {
2984 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2985 server->ssocket = NULL;
2986 return rc;
2987 }
2988
2989 /* BB other socket options to set KEEPALIVE, NODELAY? */
2990 cifs_dbg(FYI, "Socket created\n");
2991 server->ssocket = socket;
2992 socket->sk->sk_allocation = GFP_NOFS;
2993 if (sfamily == AF_INET6)
2994 cifs_reclassify_socket6(socket);
2995 else
2996 cifs_reclassify_socket4(socket);
2997 }
2998
2999 rc = bind_socket(server);
3000 if (rc < 0)
3001 return rc;
3002
3003 /*
3004 * Eventually check for other socket options to change from
3005 * the default. sock_setsockopt not used because it expects
3006 * user space buffer
3007 */
3008 socket->sk->sk_rcvtimeo = 7 * HZ;
3009 socket->sk->sk_sndtimeo = 5 * HZ;
3010
3011 /* make the bufsizes depend on wsize/rsize and max requests */
3012 if (server->noautotune) {
3013 if (socket->sk->sk_sndbuf < (200 * 1024))
3014 socket->sk->sk_sndbuf = 200 * 1024;
3015 if (socket->sk->sk_rcvbuf < (140 * 1024))
3016 socket->sk->sk_rcvbuf = 140 * 1024;
3017 }
3018
3019 if (server->tcp_nodelay) {
3020 int val = 1;
3021 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3022 (char *)&val, sizeof(val));
3023 if (rc)
3024 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3025 rc);
3026 }
3027
3028 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3029 socket->sk->sk_sndbuf,
3030 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3031
3032 rc = socket->ops->connect(socket, saddr, slen, 0);
3033 if (rc < 0) {
3034 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3035 sock_release(socket);
3036 server->ssocket = NULL;
3037 return rc;
3038 }
3039
3040 if (sport == htons(RFC1001_PORT))
3041 rc = ip_rfc1001_connect(server);
3042
3043 return rc;
3044 }
3045
3046 static int
3047 ip_connect(struct TCP_Server_Info *server)
3048 {
3049 __be16 *sport;
3050 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3051 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3052
3053 if (server->dstaddr.ss_family == AF_INET6)
3054 sport = &addr6->sin6_port;
3055 else
3056 sport = &addr->sin_port;
3057
3058 if (*sport == 0) {
3059 int rc;
3060
3061 /* try with 445 port at first */
3062 *sport = htons(CIFS_PORT);
3063
3064 rc = generic_ip_connect(server);
3065 if (rc >= 0)
3066 return rc;
3067
3068 /* if it failed, try with 139 port */
3069 *sport = htons(RFC1001_PORT);
3070 }
3071
3072 return generic_ip_connect(server);
3073 }
3074
3075 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3076 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3077 {
3078 /* if we are reconnecting then should we check to see if
3079 * any requested capabilities changed locally e.g. via
3080 * remount but we can not do much about it here
3081 * if they have (even if we could detect it by the following)
3082 * Perhaps we could add a backpointer to array of sb from tcon
3083 * or if we change to make all sb to same share the same
3084 * sb as NFS - then we only have one backpointer to sb.
3085 * What if we wanted to mount the server share twice once with
3086 * and once without posixacls or posix paths? */
3087 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3088
3089 if (vol_info && vol_info->no_linux_ext) {
3090 tcon->fsUnixInfo.Capability = 0;
3091 tcon->unix_ext = 0; /* Unix Extensions disabled */
3092 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3093 return;
3094 } else if (vol_info)
3095 tcon->unix_ext = 1; /* Unix Extensions supported */
3096
3097 if (tcon->unix_ext == 0) {
3098 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3099 return;
3100 }
3101
3102 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3103 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3104 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3105 /* check for reconnect case in which we do not
3106 want to change the mount behavior if we can avoid it */
3107 if (vol_info == NULL) {
3108 /* turn off POSIX ACL and PATHNAMES if not set
3109 originally at mount time */
3110 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3111 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3112 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3113 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3114 cifs_dbg(VFS, "POSIXPATH support change\n");
3115 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3116 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3117 cifs_dbg(VFS, "possible reconnect error\n");
3118 cifs_dbg(VFS, "server disabled POSIX path support\n");
3119 }
3120 }
3121
3122 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3123 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3124
3125 cap &= CIFS_UNIX_CAP_MASK;
3126 if (vol_info && vol_info->no_psx_acl)
3127 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3128 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3129 cifs_dbg(FYI, "negotiated posix acl support\n");
3130 if (cifs_sb)
3131 cifs_sb->mnt_cifs_flags |=
3132 CIFS_MOUNT_POSIXACL;
3133 }
3134
3135 if (vol_info && vol_info->posix_paths == 0)
3136 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3137 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3138 cifs_dbg(FYI, "negotiate posix pathnames\n");
3139 if (cifs_sb)
3140 cifs_sb->mnt_cifs_flags |=
3141 CIFS_MOUNT_POSIX_PATHS;
3142 }
3143
3144 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3145 #ifdef CONFIG_CIFS_DEBUG2
3146 if (cap & CIFS_UNIX_FCNTL_CAP)
3147 cifs_dbg(FYI, "FCNTL cap\n");
3148 if (cap & CIFS_UNIX_EXTATTR_CAP)
3149 cifs_dbg(FYI, "EXTATTR cap\n");
3150 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3151 cifs_dbg(FYI, "POSIX path cap\n");
3152 if (cap & CIFS_UNIX_XATTR_CAP)
3153 cifs_dbg(FYI, "XATTR cap\n");
3154 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3155 cifs_dbg(FYI, "POSIX ACL cap\n");
3156 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3157 cifs_dbg(FYI, "very large read cap\n");
3158 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3159 cifs_dbg(FYI, "very large write cap\n");
3160 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3161 cifs_dbg(FYI, "transport encryption cap\n");
3162 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3163 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3164 #endif /* CIFS_DEBUG2 */
3165 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3166 if (vol_info == NULL) {
3167 cifs_dbg(FYI, "resetting capabilities failed\n");
3168 } else
3169 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");
3170
3171 }
3172 }
3173 }
3174
3175 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3176 struct cifs_sb_info *cifs_sb)
3177 {
3178 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3179
3180 spin_lock_init(&cifs_sb->tlink_tree_lock);
3181 cifs_sb->tlink_tree = RB_ROOT;
3182
3183 /*
3184 * Temporarily set r/wsize for matching superblock. If we end up using
3185 * new sb then client will later negotiate it downward if needed.
3186 */
3187 cifs_sb->rsize = pvolume_info->rsize;
3188 cifs_sb->wsize = pvolume_info->wsize;
3189
3190 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3191 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3192 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3193 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3194 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3195 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3196
3197 cifs_sb->actimeo = pvolume_info->actimeo;
3198 cifs_sb->local_nls = pvolume_info->local_nls;
3199
3200 if (pvolume_info->noperm)
3201 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3202 if (pvolume_info->setuids)
3203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3204 if (pvolume_info->server_ino)
3205 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3206 if (pvolume_info->remap)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3208 if (pvolume_info->sfu_remap)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3210 if (pvolume_info->no_xattr)
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3212 if (pvolume_info->sfu_emul)
3213 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3214 if (pvolume_info->nobrl)
3215 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3216 if (pvolume_info->nostrictsync)
3217 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3218 if (pvolume_info->mand_lock)
3219 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3220 if (pvolume_info->rwpidforward)
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3222 if (pvolume_info->cifs_acl)
3223 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3224 if (pvolume_info->backupuid_specified) {
3225 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3226 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3227 }
3228 if (pvolume_info->backupgid_specified) {
3229 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3230 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3231 }
3232 if (pvolume_info->override_uid)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3234 if (pvolume_info->override_gid)
3235 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3236 if (pvolume_info->dynperm)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3238 if (pvolume_info->fsc)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3240 if (pvolume_info->multiuser)
3241 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3242 CIFS_MOUNT_NO_PERM);
3243 if (pvolume_info->strict_io)
3244 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3245 if (pvolume_info->direct_io) {
3246 cifs_dbg(FYI, "mounting share using direct i/o\n");
3247 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3248 }
3249 if (pvolume_info->mfsymlinks) {
3250 if (pvolume_info->sfu_emul) {
3251 /*
3252 * Our SFU ("Services for Unix" emulation does not allow
3253 * creating symlinks but does allow reading existing SFU
3254 * symlinks (it does allow both creating and reading SFU
3255 * style mknod and FIFOs though). When "mfsymlinks" and
3256 * "sfu" are both enabled at the same time, it allows
3257 * reading both types of symlinks, but will only create
3258 * them with mfsymlinks format. This allows better
3259 * Apple compatibility (probably better for Samba too)
3260 * while still recognizing old Windows style symlinks.
3261 */
3262 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3263 }
3264 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3265 }
3266
3267 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3268 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3269 }
3270
3271 static void
3272 cleanup_volume_info_contents(struct smb_vol *volume_info)
3273 {
3274 kfree(volume_info->username);
3275 kzfree(volume_info->password);
3276 kfree(volume_info->UNC);
3277 kfree(volume_info->domainname);
3278 kfree(volume_info->iocharset);
3279 kfree(volume_info->prepath);
3280 }
3281
3282 void
3283 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3284 {
3285 if (!volume_info)
3286 return;
3287 cleanup_volume_info_contents(volume_info);
3288 kfree(volume_info);
3289 }
3290
3291
3292 #ifdef CONFIG_CIFS_DFS_UPCALL
3293 /*
3294 * cifs_build_path_to_root returns full path to root when we do not have an
3295 * exiting connection (tcon)
3296 */
3297 static char *
3298 build_unc_path_to_root(const struct smb_vol *vol,
3299 const struct cifs_sb_info *cifs_sb)
3300 {
3301 char *full_path, *pos;
3302 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3303 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3304
3305 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3306 if (full_path == NULL)
3307 return ERR_PTR(-ENOMEM);
3308
3309 strncpy(full_path, vol->UNC, unc_len);
3310 pos = full_path + unc_len;
3311
3312 if (pplen) {
3313 *pos = CIFS_DIR_SEP(cifs_sb);
3314 strncpy(pos + 1, vol->prepath, pplen);
3315 pos += pplen;
3316 }
3317
3318 *pos = '\0'; /* add trailing null */
3319 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3320 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3321 return full_path;
3322 }
3323
3324 /*
3325 * Perform a dfs referral query for a share and (optionally) prefix
3326 *
3327 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3328 * to a string containing updated options for the submount. Otherwise it
3329 * will be left untouched.
3330 *
3331 * Returns the rc from get_dfs_path to the caller, which can be used to
3332 * determine whether there were referrals.
3333 */
3334 static int
3335 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3336 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3337 int check_prefix)
3338 {
3339 int rc;
3340 unsigned int num_referrals = 0;
3341 struct dfs_info3_param *referrals = NULL;
3342 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3343
3344 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3345 if (IS_ERR(full_path))
3346 return PTR_ERR(full_path);
3347
3348 /* For DFS paths, skip the first '\' of the UNC */
3349 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3350
3351 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3352 &num_referrals, &referrals, cifs_remap(cifs_sb));
3353
3354 if (!rc && num_referrals > 0) {
3355 char *fake_devname = NULL;
3356
3357 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3358 full_path + 1, referrals,
3359 &fake_devname);
3360
3361 free_dfs_info_array(referrals, num_referrals);
3362
3363 if (IS_ERR(mdata)) {
3364 rc = PTR_ERR(mdata);
3365 mdata = NULL;
3366 } else {
3367 cleanup_volume_info_contents(volume_info);
3368 rc = cifs_setup_volume_info(volume_info, mdata,
3369 fake_devname);
3370 }
3371 kfree(fake_devname);
3372 kfree(cifs_sb->mountdata);
3373 cifs_sb->mountdata = mdata;
3374 }
3375 kfree(full_path);
3376 return rc;
3377 }
3378 #endif
3379
3380 static int
3381 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3382 const char *devname)
3383 {
3384 int rc = 0;
3385
3386 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3387 return -EINVAL;
3388
3389 if (volume_info->nullauth) {
3390 cifs_dbg(FYI, "Anonymous login\n");
3391 kfree(volume_info->username);
3392 volume_info->username = NULL;
3393 } else if (volume_info->username) {
3394 /* BB fixme parse for domain name here */
3395 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3396 } else {
3397 cifs_dbg(VFS, "No username specified\n");
3398 /* In userspace mount helper we can get user name from alternate
3399 locations such as env variables and files on disk */
3400 return -EINVAL;
3401 }
3402
3403 /* this is needed for ASCII cp to Unicode converts */
3404 if (volume_info->iocharset == NULL) {
3405 /* load_nls_default cannot return null */
3406 volume_info->local_nls = load_nls_default();
3407 } else {
3408 volume_info->local_nls = load_nls(volume_info->iocharset);
3409 if (volume_info->local_nls == NULL) {
3410 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3411 volume_info->iocharset);
3412 return -ELIBACC;
3413 }
3414 }
3415
3416 return rc;
3417 }
3418
3419 struct smb_vol *
3420 cifs_get_volume_info(char *mount_data, const char *devname)
3421 {
3422 int rc;
3423 struct smb_vol *volume_info;
3424
3425 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3426 if (!volume_info)
3427 return ERR_PTR(-ENOMEM);
3428
3429 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3430 if (rc) {
3431 cifs_cleanup_volume_info(volume_info);
3432 volume_info = ERR_PTR(rc);
3433 }
3434
3435 return volume_info;
3436 }
3437
3438 int
3439 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3440 {
3441 int rc;
3442 unsigned int xid;
3443 struct cifs_ses *ses;
3444 struct cifs_tcon *tcon;
3445 struct TCP_Server_Info *server;
3446 char *full_path;
3447 struct tcon_link *tlink;
3448 #ifdef CONFIG_CIFS_DFS_UPCALL
3449 int referral_walks_count = 0;
3450 #endif
3451
3452 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3453 if (rc)
3454 return rc;
3455
3456 #ifdef CONFIG_CIFS_DFS_UPCALL
3457 try_mount_again:
3458 /* cleanup activities if we're chasing a referral */
3459 if (referral_walks_count) {
3460 if (tcon)
3461 cifs_put_tcon(tcon);
3462 else if (ses)
3463 cifs_put_smb_ses(ses);
3464
3465 free_xid(xid);
3466 }
3467 #endif
3468 rc = 0;
3469 tcon = NULL;
3470 ses = NULL;
3471 server = NULL;
3472 full_path = NULL;
3473 tlink = NULL;
3474
3475 xid = get_xid();
3476
3477 /* get a reference to a tcp session */
3478 server = cifs_get_tcp_session(volume_info);
3479 if (IS_ERR(server)) {
3480 rc = PTR_ERR(server);
3481 bdi_destroy(&cifs_sb->bdi);
3482 goto out;
3483 }
3484
3485 /* get a reference to a SMB session */
3486 ses = cifs_get_smb_ses(server, volume_info);
3487 if (IS_ERR(ses)) {
3488 rc = PTR_ERR(ses);
3489 ses = NULL;
3490 goto mount_fail_check;
3491 }
3492
3493 /* search for existing tcon to this server share */
3494 tcon = cifs_get_tcon(ses, volume_info);
3495 if (IS_ERR(tcon)) {
3496 rc = PTR_ERR(tcon);
3497 tcon = NULL;
3498 goto remote_path_check;
3499 }
3500
3501 /* tell server which Unix caps we support */
3502 if (cap_unix(tcon->ses)) {
3503 /* reset of caps checks mount to see if unix extensions
3504 disabled for just this mount */
3505 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3506 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3507 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3508 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3509 rc = -EACCES;
3510 goto mount_fail_check;
3511 }
3512 } else
3513 tcon->unix_ext = 0; /* server does not support them */
3514
3515 /* do not care if a following call succeed - informational */
3516 if (!tcon->ipc && server->ops->qfs_tcon)
3517 server->ops->qfs_tcon(xid, tcon);
3518
3519 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3520 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3521
3522 /* tune readahead according to rsize */
3523 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3524
3525 remote_path_check:
3526 #ifdef CONFIG_CIFS_DFS_UPCALL
3527 /*
3528 * Perform an unconditional check for whether there are DFS
3529 * referrals for this path without prefix, to provide support
3530 * for DFS referrals from w2k8 servers which don't seem to respond
3531 * with PATH_NOT_COVERED to requests that include the prefix.
3532 * Chase the referral if found, otherwise continue normally.
3533 */
3534 if (referral_walks_count == 0) {
3535 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3536 false);
3537 if (!refrc) {
3538 referral_walks_count++;
3539 goto try_mount_again;
3540 }
3541 }
3542 #endif
3543
3544 /* check if a whole path is not remote */
3545 if (!rc && tcon) {
3546 if (!server->ops->is_path_accessible) {
3547 rc = -ENOSYS;
3548 goto mount_fail_check;
3549 }
3550 /*
3551 * cifs_build_path_to_root works only when we have a valid tcon
3552 */
3553 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3554 if (full_path == NULL) {
3555 rc = -ENOMEM;
3556 goto mount_fail_check;
3557 }
3558 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3559 full_path);
3560 if (rc != 0 && rc != -EREMOTE) {
3561 kfree(full_path);
3562 goto mount_fail_check;
3563 }
3564 kfree(full_path);
3565 }
3566
3567 /* get referral if needed */
3568 if (rc == -EREMOTE) {
3569 #ifdef CONFIG_CIFS_DFS_UPCALL
3570 if (referral_walks_count > MAX_NESTED_LINKS) {
3571 /*
3572 * BB: when we implement proper loop detection,
3573 * we will remove this check. But now we need it
3574 * to prevent an indefinite loop if 'DFS tree' is
3575 * misconfigured (i.e. has loops).
3576 */
3577 rc = -ELOOP;
3578 goto mount_fail_check;
3579 }
3580
3581 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3582
3583 if (!rc) {
3584 referral_walks_count++;
3585 goto try_mount_again;
3586 }
3587 goto mount_fail_check;
3588 #else /* No DFS support, return error on mount */
3589 rc = -EOPNOTSUPP;
3590 #endif
3591 }
3592
3593 if (rc)
3594 goto mount_fail_check;
3595
3596 /* now, hang the tcon off of the superblock */
3597 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3598 if (tlink == NULL) {
3599 rc = -ENOMEM;
3600 goto mount_fail_check;
3601 }
3602
3603 tlink->tl_uid = ses->linux_uid;
3604 tlink->tl_tcon = tcon;
3605 tlink->tl_time = jiffies;
3606 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3607 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3608
3609 cifs_sb->master_tlink = tlink;
3610 spin_lock(&cifs_sb->tlink_tree_lock);
3611 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3612 spin_unlock(&cifs_sb->tlink_tree_lock);
3613
3614 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3615 TLINK_IDLE_EXPIRE);
3616
3617 mount_fail_check:
3618 /* on error free sesinfo and tcon struct if needed */
3619 if (rc) {
3620 /* If find_unc succeeded then rc == 0 so we can not end */
3621 /* up accidentally freeing someone elses tcon struct */
3622 if (tcon)
3623 cifs_put_tcon(tcon);
3624 else if (ses)
3625 cifs_put_smb_ses(ses);
3626 else
3627 cifs_put_tcp_session(server);
3628 bdi_destroy(&cifs_sb->bdi);
3629 }
3630
3631 out:
3632 free_xid(xid);
3633 return rc;
3634 }
3635
3636 /*
3637 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3638 * pointer may be NULL.
3639 */
3640 int
3641 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3642 const char *tree, struct cifs_tcon *tcon,
3643 const struct nls_table *nls_codepage)
3644 {
3645 struct smb_hdr *smb_buffer;
3646 struct smb_hdr *smb_buffer_response;
3647 TCONX_REQ *pSMB;
3648 TCONX_RSP *pSMBr;
3649 unsigned char *bcc_ptr;
3650 int rc = 0;
3651 int length;
3652 __u16 bytes_left, count;
3653
3654 if (ses == NULL)
3655 return -EIO;
3656
3657 smb_buffer = cifs_buf_get();
3658 if (smb_buffer == NULL)
3659 return -ENOMEM;
3660
3661 smb_buffer_response = smb_buffer;
3662
3663 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3664 NULL /*no tid */ , 4 /*wct */ );
3665
3666 smb_buffer->Mid = get_next_mid(ses->server);
3667 smb_buffer->Uid = ses->Suid;
3668 pSMB = (TCONX_REQ *) smb_buffer;
3669 pSMBr = (TCONX_RSP *) smb_buffer_response;
3670
3671 pSMB->AndXCommand = 0xFF;
3672 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3673 bcc_ptr = &pSMB->Password[0];
3674 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3675 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3676 *bcc_ptr = 0; /* password is null byte */
3677 bcc_ptr++; /* skip password */
3678 /* already aligned so no need to do it below */
3679 } else {
3680 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3681 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3682 specified as required (when that support is added to
3683 the vfs in the future) as only NTLM or the much
3684 weaker LANMAN (which we do not send by default) is accepted
3685 by Samba (not sure whether other servers allow
3686 NTLMv2 password here) */
3687 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3688 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3689 (ses->sectype == LANMAN))
3690 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3691 ses->server->sec_mode &
3692 SECMODE_PW_ENCRYPT ? true : false,
3693 bcc_ptr);
3694 else
3695 #endif /* CIFS_WEAK_PW_HASH */
3696 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3697 bcc_ptr, nls_codepage);
3698 if (rc) {
3699 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3700 __func__, rc);
3701 cifs_buf_release(smb_buffer);
3702 return rc;
3703 }
3704
3705 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3706 if (ses->capabilities & CAP_UNICODE) {
3707 /* must align unicode strings */
3708 *bcc_ptr = 0; /* null byte password */
3709 bcc_ptr++;
3710 }
3711 }
3712
3713 if (ses->server->sign)
3714 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3715
3716 if (ses->capabilities & CAP_STATUS32) {
3717 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3718 }
3719 if (ses->capabilities & CAP_DFS) {
3720 smb_buffer->Flags2 |= SMBFLG2_DFS;
3721 }
3722 if (ses->capabilities & CAP_UNICODE) {
3723 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3724 length =
3725 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3726 6 /* max utf8 char length in bytes */ *
3727 (/* server len*/ + 256 /* share len */), nls_codepage);
3728 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3729 bcc_ptr += 2; /* skip trailing null */
3730 } else { /* ASCII */
3731 strcpy(bcc_ptr, tree);
3732 bcc_ptr += strlen(tree) + 1;
3733 }
3734 strcpy(bcc_ptr, "?????");
3735 bcc_ptr += strlen("?????");
3736 bcc_ptr += 1;
3737 count = bcc_ptr - &pSMB->Password[0];
3738 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3739 pSMB->hdr.smb_buf_length) + count);
3740 pSMB->ByteCount = cpu_to_le16(count);
3741
3742 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3743 0);
3744
3745 /* above now done in SendReceive */
3746 if ((rc == 0) && (tcon != NULL)) {
3747 bool is_unicode;
3748
3749 tcon->tidStatus = CifsGood;
3750 tcon->need_reconnect = false;
3751 tcon->tid = smb_buffer_response->Tid;
3752 bcc_ptr = pByteArea(smb_buffer_response);
3753 bytes_left = get_bcc(smb_buffer_response);
3754 length = strnlen(bcc_ptr, bytes_left - 2);
3755 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3756 is_unicode = true;
3757 else
3758 is_unicode = false;
3759
3760
3761 /* skip service field (NB: this field is always ASCII) */
3762 if (length == 3) {
3763 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3764 (bcc_ptr[2] == 'C')) {
3765 cifs_dbg(FYI, "IPC connection\n");
3766 tcon->ipc = 1;
3767 }
3768 } else if (length == 2) {
3769 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3770 /* the most common case */
3771 cifs_dbg(FYI, "disk share connection\n");
3772 }
3773 }
3774 bcc_ptr += length + 1;
3775 bytes_left -= (length + 1);
3776 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3777
3778 /* mostly informational -- no need to fail on error here */
3779 kfree(tcon->nativeFileSystem);
3780 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3781 bytes_left, is_unicode,
3782 nls_codepage);
3783
3784 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3785
3786 if ((smb_buffer_response->WordCount == 3) ||
3787 (smb_buffer_response->WordCount == 7))
3788 /* field is in same location */
3789 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3790 else
3791 tcon->Flags = 0;
3792 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3793 } else if ((rc == 0) && tcon == NULL) {
3794 /* all we need to save for IPC$ connection */
3795 ses->ipc_tid = smb_buffer_response->Tid;
3796 }
3797
3798 cifs_buf_release(smb_buffer);
3799 return rc;
3800 }
3801
3802 static void delayed_free(struct rcu_head *p)
3803 {
3804 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3805 unload_nls(sbi->local_nls);
3806 kfree(sbi);
3807 }
3808
3809 void
3810 cifs_umount(struct cifs_sb_info *cifs_sb)
3811 {
3812 struct rb_root *root = &cifs_sb->tlink_tree;
3813 struct rb_node *node;
3814 struct tcon_link *tlink;
3815
3816 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3817
3818 spin_lock(&cifs_sb->tlink_tree_lock);
3819 while ((node = rb_first(root))) {
3820 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3821 cifs_get_tlink(tlink);
3822 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3823 rb_erase(node, root);
3824
3825 spin_unlock(&cifs_sb->tlink_tree_lock);
3826 cifs_put_tlink(tlink);
3827 spin_lock(&cifs_sb->tlink_tree_lock);
3828 }
3829 spin_unlock(&cifs_sb->tlink_tree_lock);
3830
3831 bdi_destroy(&cifs_sb->bdi);
3832 kfree(cifs_sb->mountdata);
3833 call_rcu(&cifs_sb->rcu, delayed_free);
3834 }
3835
3836 int
3837 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3838 {
3839 int rc = 0;
3840 struct TCP_Server_Info *server = ses->server;
3841
3842 if (!server->ops->need_neg || !server->ops->negotiate)
3843 return -ENOSYS;
3844
3845 /* only send once per connect */
3846 if (!server->ops->need_neg(server))
3847 return 0;
3848
3849 set_credits(server, 1);
3850
3851 rc = server->ops->negotiate(xid, ses);
3852 if (rc == 0) {
3853 spin_lock(&GlobalMid_Lock);
3854 if (server->tcpStatus == CifsNeedNegotiate)
3855 server->tcpStatus = CifsGood;
3856 else
3857 rc = -EHOSTDOWN;
3858 spin_unlock(&GlobalMid_Lock);
3859 }
3860
3861 return rc;
3862 }
3863
3864 int
3865 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3866 struct nls_table *nls_info)
3867 {
3868 int rc = -ENOSYS;
3869 struct TCP_Server_Info *server = ses->server;
3870
3871 ses->capabilities = server->capabilities;
3872 if (linuxExtEnabled == 0)
3873 ses->capabilities &= (~server->vals->cap_unix);
3874
3875 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3876 server->sec_mode, server->capabilities, server->timeAdj);
3877
3878 if (server->ops->sess_setup)
3879 rc = server->ops->sess_setup(xid, ses, nls_info);
3880
3881 if (rc)
3882 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3883
3884 return rc;
3885 }
3886
3887 static int
3888 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3889 {
3890 vol->sectype = ses->sectype;
3891
3892 /* krb5 is special, since we don't need username or pw */
3893 if (vol->sectype == Kerberos)
3894 return 0;
3895
3896 return cifs_set_cifscreds(vol, ses);
3897 }
3898
3899 static struct cifs_tcon *
3900 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3901 {
3902 int rc;
3903 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3904 struct cifs_ses *ses;
3905 struct cifs_tcon *tcon = NULL;
3906 struct smb_vol *vol_info;
3907
3908 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3909 if (vol_info == NULL)
3910 return ERR_PTR(-ENOMEM);
3911
3912 vol_info->local_nls = cifs_sb->local_nls;
3913 vol_info->linux_uid = fsuid;
3914 vol_info->cred_uid = fsuid;
3915 vol_info->UNC = master_tcon->treeName;
3916 vol_info->retry = master_tcon->retry;
3917 vol_info->nocase = master_tcon->nocase;
3918 vol_info->local_lease = master_tcon->local_lease;
3919 vol_info->no_linux_ext = !master_tcon->unix_ext;
3920 vol_info->sectype = master_tcon->ses->sectype;
3921 vol_info->sign = master_tcon->ses->sign;
3922
3923 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3924 if (rc) {
3925 tcon = ERR_PTR(rc);
3926 goto out;
3927 }
3928
3929 /* get a reference for the same TCP session */
3930 spin_lock(&cifs_tcp_ses_lock);
3931 ++master_tcon->ses->server->srv_count;
3932 spin_unlock(&cifs_tcp_ses_lock);
3933
3934 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3935 if (IS_ERR(ses)) {
3936 tcon = (struct cifs_tcon *)ses;
3937 cifs_put_tcp_session(master_tcon->ses->server);
3938 goto out;
3939 }
3940
3941 tcon = cifs_get_tcon(ses, vol_info);
3942 if (IS_ERR(tcon)) {
3943 cifs_put_smb_ses(ses);
3944 goto out;
3945 }
3946
3947 if (cap_unix(ses))
3948 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3949 out:
3950 kfree(vol_info->username);
3951 kfree(vol_info->password);
3952 kfree(vol_info);
3953
3954 return tcon;
3955 }
3956
3957 struct cifs_tcon *
3958 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3959 {
3960 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3961 }
3962
3963 /* find and return a tlink with given uid */
3964 static struct tcon_link *
3965 tlink_rb_search(struct rb_root *root, kuid_t uid)
3966 {
3967 struct rb_node *node = root->rb_node;
3968 struct tcon_link *tlink;
3969
3970 while (node) {
3971 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3972
3973 if (uid_gt(tlink->tl_uid, uid))
3974 node = node->rb_left;
3975 else if (uid_lt(tlink->tl_uid, uid))
3976 node = node->rb_right;
3977 else
3978 return tlink;
3979 }
3980 return NULL;
3981 }
3982
3983 /* insert a tcon_link into the tree */
3984 static void
3985 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3986 {
3987 struct rb_node **new = &(root->rb_node), *parent = NULL;
3988 struct tcon_link *tlink;
3989
3990 while (*new) {
3991 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3992 parent = *new;
3993
3994 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3995 new = &((*new)->rb_left);
3996 else
3997 new = &((*new)->rb_right);
3998 }
3999
4000 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4001 rb_insert_color(&new_tlink->tl_rbnode, root);
4002 }
4003
4004 /*
4005 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4006 * current task.
4007 *
4008 * If the superblock doesn't refer to a multiuser mount, then just return
4009 * the master tcon for the mount.
4010 *
4011 * First, search the rbtree for an existing tcon for this fsuid. If one
4012 * exists, then check to see if it's pending construction. If it is then wait
4013 * for construction to complete. Once it's no longer pending, check to see if
4014 * it failed and either return an error or retry construction, depending on
4015 * the timeout.
4016 *
4017 * If one doesn't exist then insert a new tcon_link struct into the tree and
4018 * try to construct a new one.
4019 */
4020 struct tcon_link *
4021 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4022 {
4023 int ret;
4024 kuid_t fsuid = current_fsuid();
4025 struct tcon_link *tlink, *newtlink;
4026
4027 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4028 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4029
4030 spin_lock(&cifs_sb->tlink_tree_lock);
4031 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4032 if (tlink)
4033 cifs_get_tlink(tlink);
4034 spin_unlock(&cifs_sb->tlink_tree_lock);
4035
4036 if (tlink == NULL) {
4037 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4038 if (newtlink == NULL)
4039 return ERR_PTR(-ENOMEM);
4040 newtlink->tl_uid = fsuid;
4041 newtlink->tl_tcon = ERR_PTR(-EACCES);
4042 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4043 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4044 cifs_get_tlink(newtlink);
4045
4046 spin_lock(&cifs_sb->tlink_tree_lock);
4047 /* was one inserted after previous search? */
4048 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4049 if (tlink) {
4050 cifs_get_tlink(tlink);
4051 spin_unlock(&cifs_sb->tlink_tree_lock);
4052 kfree(newtlink);
4053 goto wait_for_construction;
4054 }
4055 tlink = newtlink;
4056 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4057 spin_unlock(&cifs_sb->tlink_tree_lock);
4058 } else {
4059 wait_for_construction:
4060 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4061 TASK_INTERRUPTIBLE);
4062 if (ret) {
4063 cifs_put_tlink(tlink);
4064 return ERR_PTR(-ERESTARTSYS);
4065 }
4066
4067 /* if it's good, return it */
4068 if (!IS_ERR(tlink->tl_tcon))
4069 return tlink;
4070
4071 /* return error if we tried this already recently */
4072 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4073 cifs_put_tlink(tlink);
4074 return ERR_PTR(-EACCES);
4075 }
4076
4077 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4078 goto wait_for_construction;
4079 }
4080
4081 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4082 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4083 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4084
4085 if (IS_ERR(tlink->tl_tcon)) {
4086 cifs_put_tlink(tlink);
4087 return ERR_PTR(-EACCES);
4088 }
4089
4090 return tlink;
4091 }
4092
4093 /*
4094 * periodic workqueue job that scans tcon_tree for a superblock and closes
4095 * out tcons.
4096 */
4097 static void
4098 cifs_prune_tlinks(struct work_struct *work)
4099 {
4100 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4101 prune_tlinks.work);
4102 struct rb_root *root = &cifs_sb->tlink_tree;
4103 struct rb_node *node = rb_first(root);
4104 struct rb_node *tmp;
4105 struct tcon_link *tlink;
4106
4107 /*
4108 * Because we drop the spinlock in the loop in order to put the tlink
4109 * it's not guarded against removal of links from the tree. The only
4110 * places that remove entries from the tree are this function and
4111 * umounts. Because this function is non-reentrant and is canceled
4112 * before umount can proceed, this is safe.
4113 */
4114 spin_lock(&cifs_sb->tlink_tree_lock);
4115 node = rb_first(root);
4116 while (node != NULL) {
4117 tmp = node;
4118 node = rb_next(tmp);
4119 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4120
4121 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4122 atomic_read(&tlink->tl_count) != 0 ||
4123 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4124 continue;
4125
4126 cifs_get_tlink(tlink);
4127 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4128 rb_erase(tmp, root);
4129
4130 spin_unlock(&cifs_sb->tlink_tree_lock);
4131 cifs_put_tlink(tlink);
4132 spin_lock(&cifs_sb->tlink_tree_lock);
4133 }
4134 spin_unlock(&cifs_sb->tlink_tree_lock);
4135
4136 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4137 TLINK_IDLE_EXPIRE);
4138 }
Linux kernel - Deliverables
This page took 0.118181 seconds and 5 git commands to generate.