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1/*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/net.h>
23#include <linux/string.h>
24#include <linux/list.h>
25#include <linux/wait.h>
26#include <linux/slab.h>
27#include <linux/pagemap.h>
28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/mempool.h>
31#include <linux/delay.h>
32#include <linux/completion.h>
33#include <linux/kthread.h>
34#include <linux/pagevec.h>
35#include <linux/freezer.h>
36#include <linux/namei.h>
37#include <asm/uaccess.h>
38#include <asm/processor.h>
39#include <linux/inet.h>
40#include <linux/module.h>
41#include <keys/user-type.h>
42#include <net/ipv6.h>
43#include <linux/parser.h>
44
45#include "cifspdu.h"
46#include "cifsglob.h"
47#include "cifsproto.h"
48#include "cifs_unicode.h"
49#include "cifs_debug.h"
50#include "cifs_fs_sb.h"
51#include "ntlmssp.h"
52#include "nterr.h"
53#include "rfc1002pdu.h"
54#include "fscache.h"
55
56#define CIFS_PORT 445
57#define RFC1001_PORT 139
58
59/* SMB echo "timeout" -- FIXME: tunable? */
60#define SMB_ECHO_INTERVAL (60 * HZ)
61
62extern mempool_t *cifs_req_poolp;
63
64/* FIXME: should these be tunable? */
65#define TLINK_ERROR_EXPIRE (1 * HZ)
66#define TLINK_IDLE_EXPIRE (600 * HZ)
67
68enum {
69
70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
73 Opt_noblocksend, Opt_noautotune,
74 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
75 Opt_mapchars, Opt_nomapchars, Opt_sfu,
76 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
77 Opt_noposixpaths, Opt_nounix,
78 Opt_nocase,
79 Opt_brl, Opt_nobrl,
80 Opt_forcemandatorylock, Opt_setuids,
81 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
82 Opt_nohard, Opt_nosoft,
83 Opt_nointr, Opt_intr,
84 Opt_nostrictsync, Opt_strictsync,
85 Opt_serverino, Opt_noserverino,
86 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
87 Opt_acl, Opt_noacl, Opt_locallease,
88 Opt_sign, Opt_seal, Opt_direct,
89 Opt_strictcache, Opt_noac,
90 Opt_fsc, Opt_mfsymlinks,
91 Opt_multiuser, Opt_sloppy,
92
93 /* Mount options which take numeric value */
94 Opt_backupuid, Opt_backupgid, Opt_uid,
95 Opt_cruid, Opt_gid, Opt_file_mode,
96 Opt_dirmode, Opt_port,
97 Opt_rsize, Opt_wsize, Opt_actimeo,
98
99 /* Mount options which take string value */
100 Opt_user, Opt_pass, Opt_ip,
101 Opt_unc, Opt_domain,
102 Opt_srcaddr, Opt_prefixpath,
103 Opt_iocharset, Opt_sockopt,
104 Opt_netbiosname, Opt_servern,
105 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
106
107 /* Mount options to be ignored */
108 Opt_ignore,
109
110 /* Options which could be blank */
111 Opt_blank_pass,
112 Opt_blank_user,
113 Opt_blank_ip,
114
115 Opt_err
116};
117
118static const match_table_t cifs_mount_option_tokens = {
119
120 { Opt_user_xattr, "user_xattr" },
121 { Opt_nouser_xattr, "nouser_xattr" },
122 { Opt_forceuid, "forceuid" },
123 { Opt_noforceuid, "noforceuid" },
124 { Opt_noblocksend, "noblocksend" },
125 { Opt_noautotune, "noautotune" },
126 { Opt_hard, "hard" },
127 { Opt_soft, "soft" },
128 { Opt_perm, "perm" },
129 { Opt_noperm, "noperm" },
130 { Opt_mapchars, "mapchars" },
131 { Opt_nomapchars, "nomapchars" },
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_direct, "direct" },
167 { Opt_direct, "directio" },
168 { Opt_direct, "forcedirectio" },
169 { Opt_strictcache, "strictcache" },
170 { Opt_noac, "noac" },
171 { Opt_fsc, "fsc" },
172 { Opt_mfsymlinks, "mfsymlinks" },
173 { Opt_multiuser, "multiuser" },
174 { Opt_sloppy, "sloppy" },
175
176 { Opt_backupuid, "backupuid=%s" },
177 { Opt_backupgid, "backupgid=%s" },
178 { Opt_uid, "uid=%s" },
179 { Opt_cruid, "cruid=%s" },
180 { Opt_gid, "gid=%s" },
181 { Opt_file_mode, "file_mode=%s" },
182 { Opt_dirmode, "dirmode=%s" },
183 { Opt_dirmode, "dir_mode=%s" },
184 { Opt_port, "port=%s" },
185 { Opt_rsize, "rsize=%s" },
186 { Opt_wsize, "wsize=%s" },
187 { Opt_actimeo, "actimeo=%s" },
188
189 { Opt_blank_user, "user=" },
190 { Opt_blank_user, "username=" },
191 { Opt_user, "user=%s" },
192 { Opt_user, "username=%s" },
193 { Opt_blank_pass, "pass=" },
194 { Opt_pass, "pass=%s" },
195 { Opt_pass, "password=%s" },
196 { Opt_blank_ip, "ip=" },
197 { Opt_blank_ip, "addr=" },
198 { Opt_ip, "ip=%s" },
199 { Opt_ip, "addr=%s" },
200 { Opt_unc, "unc=%s" },
201 { Opt_unc, "target=%s" },
202 { Opt_unc, "path=%s" },
203 { Opt_domain, "dom=%s" },
204 { Opt_domain, "domain=%s" },
205 { Opt_domain, "workgroup=%s" },
206 { Opt_srcaddr, "srcaddr=%s" },
207 { Opt_prefixpath, "prefixpath=%s" },
208 { Opt_iocharset, "iocharset=%s" },
209 { Opt_sockopt, "sockopt=%s" },
210 { Opt_netbiosname, "netbiosname=%s" },
211 { Opt_servern, "servern=%s" },
212 { Opt_ver, "ver=%s" },
213 { Opt_vers, "vers=%s" },
214 { Opt_sec, "sec=%s" },
215 { Opt_cache, "cache=%s" },
216
217 { Opt_ignore, "cred" },
218 { Opt_ignore, "credentials" },
219 { Opt_ignore, "cred=%s" },
220 { Opt_ignore, "credentials=%s" },
221 { Opt_ignore, "guest" },
222 { Opt_ignore, "rw" },
223 { Opt_ignore, "ro" },
224 { Opt_ignore, "suid" },
225 { Opt_ignore, "nosuid" },
226 { Opt_ignore, "exec" },
227 { Opt_ignore, "noexec" },
228 { Opt_ignore, "nodev" },
229 { Opt_ignore, "noauto" },
230 { Opt_ignore, "dev" },
231 { Opt_ignore, "mand" },
232 { Opt_ignore, "nomand" },
233 { Opt_ignore, "_netdev" },
234
235 { Opt_err, NULL }
236};
237
238enum {
239 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
240 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
241 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
242 Opt_sec_ntlmv2i, Opt_sec_lanman,
243 Opt_sec_none,
244
245 Opt_sec_err
246};
247
248static const match_table_t cifs_secflavor_tokens = {
249 { Opt_sec_krb5, "krb5" },
250 { Opt_sec_krb5i, "krb5i" },
251 { Opt_sec_krb5p, "krb5p" },
252 { Opt_sec_ntlmsspi, "ntlmsspi" },
253 { Opt_sec_ntlmssp, "ntlmssp" },
254 { Opt_ntlm, "ntlm" },
255 { Opt_sec_ntlmi, "ntlmi" },
256 { Opt_sec_ntlmv2, "nontlm" },
257 { Opt_sec_ntlmv2, "ntlmv2" },
258 { Opt_sec_ntlmv2i, "ntlmv2i" },
259 { Opt_sec_lanman, "lanman" },
260 { Opt_sec_none, "none" },
261
262 { Opt_sec_err, NULL }
263};
264
265/* cache flavors */
266enum {
267 Opt_cache_loose,
268 Opt_cache_strict,
269 Opt_cache_none,
270 Opt_cache_err
271};
272
273static const match_table_t cifs_cacheflavor_tokens = {
274 { Opt_cache_loose, "loose" },
275 { Opt_cache_strict, "strict" },
276 { Opt_cache_none, "none" },
277 { Opt_cache_err, NULL }
278};
279
280static const match_table_t cifs_smb_version_tokens = {
281 { Smb_1, SMB1_VERSION_STRING },
282 { Smb_21, SMB21_VERSION_STRING },
283};
284
285static int ip_connect(struct TCP_Server_Info *server);
286static int generic_ip_connect(struct TCP_Server_Info *server);
287static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
288static void cifs_prune_tlinks(struct work_struct *work);
289static 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 */
300static int
301cifs_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
321 cFYI(1, "Reconnecting tcp session");
322
323 /* before reconnecting the tcp session, mark the smb session (uid)
324 and the tid bad so they are not used until reconnected */
325 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
326 spin_lock(&cifs_tcp_ses_lock);
327 list_for_each(tmp, &server->smb_ses_list) {
328 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
329 ses->need_reconnect = true;
330 ses->ipc_tid = 0;
331 list_for_each(tmp2, &ses->tcon_list) {
332 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
333 tcon->need_reconnect = true;
334 }
335 }
336 spin_unlock(&cifs_tcp_ses_lock);
337
338 /* do not want to be sending data on a socket we are freeing */
339 cFYI(1, "%s: tearing down socket", __func__);
340 mutex_lock(&server->srv_mutex);
341 if (server->ssocket) {
342 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
343 server->ssocket->flags);
344 kernel_sock_shutdown(server->ssocket, SHUT_WR);
345 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
346 server->ssocket->state,
347 server->ssocket->flags);
348 sock_release(server->ssocket);
349 server->ssocket = NULL;
350 }
351 server->sequence_number = 0;
352 server->session_estab = false;
353 kfree(server->session_key.response);
354 server->session_key.response = NULL;
355 server->session_key.len = 0;
356 server->lstrp = jiffies;
357 mutex_unlock(&server->srv_mutex);
358
359 /* mark submitted MIDs for retry and issue callback */
360 INIT_LIST_HEAD(&retry_list);
361 cFYI(1, "%s: moving mids to private list", __func__);
362 spin_lock(&GlobalMid_Lock);
363 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
364 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
365 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
366 mid_entry->mid_state = MID_RETRY_NEEDED;
367 list_move(&mid_entry->qhead, &retry_list);
368 }
369 spin_unlock(&GlobalMid_Lock);
370
371 cFYI(1, "%s: issuing mid callbacks", __func__);
372 list_for_each_safe(tmp, tmp2, &retry_list) {
373 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
374 list_del_init(&mid_entry->qhead);
375 mid_entry->callback(mid_entry);
376 }
377
378 do {
379 try_to_freeze();
380
381 /* we should try only the port we connected to before */
382 rc = generic_ip_connect(server);
383 if (rc) {
384 cFYI(1, "reconnect error %d", rc);
385 msleep(3000);
386 } else {
387 atomic_inc(&tcpSesReconnectCount);
388 spin_lock(&GlobalMid_Lock);
389 if (server->tcpStatus != CifsExiting)
390 server->tcpStatus = CifsNeedNegotiate;
391 spin_unlock(&GlobalMid_Lock);
392 }
393 } while (server->tcpStatus == CifsNeedReconnect);
394
395 return rc;
396}
397
398/*
399 return codes:
400 0 not a transact2, or all data present
401 >0 transact2 with that much data missing
402 -EINVAL = invalid transact2
403
404 */
405static int check2ndT2(char *buf)
406{
407 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
408 struct smb_t2_rsp *pSMBt;
409 int remaining;
410 __u16 total_data_size, data_in_this_rsp;
411
412 if (pSMB->Command != SMB_COM_TRANSACTION2)
413 return 0;
414
415 /* check for plausible wct, bcc and t2 data and parm sizes */
416 /* check for parm and data offset going beyond end of smb */
417 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
418 cFYI(1, "invalid transact2 word count");
419 return -EINVAL;
420 }
421
422 pSMBt = (struct smb_t2_rsp *)pSMB;
423
424 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
425 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
426
427 if (total_data_size == data_in_this_rsp)
428 return 0;
429 else if (total_data_size < data_in_this_rsp) {
430 cFYI(1, "total data %d smaller than data in frame %d",
431 total_data_size, data_in_this_rsp);
432 return -EINVAL;
433 }
434
435 remaining = total_data_size - data_in_this_rsp;
436
437 cFYI(1, "missing %d bytes from transact2, check next response",
438 remaining);
439 if (total_data_size > CIFSMaxBufSize) {
440 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
441 total_data_size, CIFSMaxBufSize);
442 return -EINVAL;
443 }
444 return remaining;
445}
446
447static int coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
448{
449 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
450 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
451 char *data_area_of_tgt;
452 char *data_area_of_src;
453 int remaining;
454 unsigned int byte_count, total_in_tgt;
455 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
456
457 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
458 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
459
460 if (tgt_total_cnt != src_total_cnt)
461 cFYI(1, "total data count of primary and secondary t2 differ "
462 "source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
463
464 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
465
466 remaining = tgt_total_cnt - total_in_tgt;
467
468 if (remaining < 0) {
469 cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
470 "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
471 return -EPROTO;
472 }
473
474 if (remaining == 0) {
475 /* nothing to do, ignore */
476 cFYI(1, "no more data remains");
477 return 0;
478 }
479
480 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
481 if (remaining < total_in_src)
482 cFYI(1, "transact2 2nd response contains too much data");
483
484 /* find end of first SMB data area */
485 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
486 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
487
488 /* validate target area */
489 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
490 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
491
492 data_area_of_tgt += total_in_tgt;
493
494 total_in_tgt += total_in_src;
495 /* is the result too big for the field? */
496 if (total_in_tgt > USHRT_MAX) {
497 cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
498 return -EPROTO;
499 }
500 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
501
502 /* fix up the BCC */
503 byte_count = get_bcc(target_hdr);
504 byte_count += total_in_src;
505 /* is the result too big for the field? */
506 if (byte_count > USHRT_MAX) {
507 cFYI(1, "coalesced BCC too large (%u)", byte_count);
508 return -EPROTO;
509 }
510 put_bcc(byte_count, target_hdr);
511
512 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
513 byte_count += total_in_src;
514 /* don't allow buffer to overflow */
515 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
516 cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
517 return -ENOBUFS;
518 }
519 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
520
521 /* copy second buffer into end of first buffer */
522 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
523
524 if (remaining != total_in_src) {
525 /* more responses to go */
526 cFYI(1, "waiting for more secondary responses");
527 return 1;
528 }
529
530 /* we are done */
531 cFYI(1, "found the last secondary response");
532 return 0;
533}
534
535static void
536cifs_echo_request(struct work_struct *work)
537{
538 int rc;
539 struct TCP_Server_Info *server = container_of(work,
540 struct TCP_Server_Info, echo.work);
541
542 /*
543 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
544 * done, which is indicated by maxBuf != 0. Also, no need to ping if
545 * we got a response recently
546 */
547 if (server->maxBuf == 0 ||
548 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
549 goto requeue_echo;
550
551 rc = CIFSSMBEcho(server);
552 if (rc)
553 cFYI(1, "Unable to send echo request to server: %s",
554 server->hostname);
555
556requeue_echo:
557 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
558}
559
560static bool
561allocate_buffers(struct TCP_Server_Info *server)
562{
563 if (!server->bigbuf) {
564 server->bigbuf = (char *)cifs_buf_get();
565 if (!server->bigbuf) {
566 cERROR(1, "No memory for large SMB response");
567 msleep(3000);
568 /* retry will check if exiting */
569 return false;
570 }
571 } else if (server->large_buf) {
572 /* we are reusing a dirty large buf, clear its start */
573 memset(server->bigbuf, 0, HEADER_SIZE(server));
574 }
575
576 if (!server->smallbuf) {
577 server->smallbuf = (char *)cifs_small_buf_get();
578 if (!server->smallbuf) {
579 cERROR(1, "No memory for SMB response");
580 msleep(1000);
581 /* retry will check if exiting */
582 return false;
583 }
584 /* beginning of smb buffer is cleared in our buf_get */
585 } else {
586 /* if existing small buf clear beginning */
587 memset(server->smallbuf, 0, HEADER_SIZE(server));
588 }
589
590 return true;
591}
592
593static bool
594server_unresponsive(struct TCP_Server_Info *server)
595{
596 /*
597 * We need to wait 2 echo intervals to make sure we handle such
598 * situations right:
599 * 1s client sends a normal SMB request
600 * 2s client gets a response
601 * 30s echo workqueue job pops, and decides we got a response recently
602 * and don't need to send another
603 * ...
604 * 65s kernel_recvmsg times out, and we see that we haven't gotten
605 * a response in >60s.
606 */
607 if (server->tcpStatus == CifsGood &&
608 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
609 cERROR(1, "Server %s has not responded in %d seconds. "
610 "Reconnecting...", server->hostname,
611 (2 * SMB_ECHO_INTERVAL) / HZ);
612 cifs_reconnect(server);
613 wake_up(&server->response_q);
614 return true;
615 }
616
617 return false;
618}
619
620/*
621 * kvec_array_init - clone a kvec array, and advance into it
622 * @new: pointer to memory for cloned array
623 * @iov: pointer to original array
624 * @nr_segs: number of members in original array
625 * @bytes: number of bytes to advance into the cloned array
626 *
627 * This function will copy the array provided in iov to a section of memory
628 * and advance the specified number of bytes into the new array. It returns
629 * the number of segments in the new array. "new" must be at least as big as
630 * the original iov array.
631 */
632static unsigned int
633kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
634 size_t bytes)
635{
636 size_t base = 0;
637
638 while (bytes || !iov->iov_len) {
639 int copy = min(bytes, iov->iov_len);
640
641 bytes -= copy;
642 base += copy;
643 if (iov->iov_len == base) {
644 iov++;
645 nr_segs--;
646 base = 0;
647 }
648 }
649 memcpy(new, iov, sizeof(*iov) * nr_segs);
650 new->iov_base += base;
651 new->iov_len -= base;
652 return nr_segs;
653}
654
655static struct kvec *
656get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
657{
658 struct kvec *new_iov;
659
660 if (server->iov && nr_segs <= server->nr_iov)
661 return server->iov;
662
663 /* not big enough -- allocate a new one and release the old */
664 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
665 if (new_iov) {
666 kfree(server->iov);
667 server->iov = new_iov;
668 server->nr_iov = nr_segs;
669 }
670 return new_iov;
671}
672
673int
674cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
675 unsigned int nr_segs, unsigned int to_read)
676{
677 int length = 0;
678 int total_read;
679 unsigned int segs;
680 struct msghdr smb_msg;
681 struct kvec *iov;
682
683 iov = get_server_iovec(server, nr_segs);
684 if (!iov)
685 return -ENOMEM;
686
687 smb_msg.msg_control = NULL;
688 smb_msg.msg_controllen = 0;
689
690 for (total_read = 0; to_read; total_read += length, to_read -= length) {
691 try_to_freeze();
692
693 if (server_unresponsive(server)) {
694 total_read = -EAGAIN;
695 break;
696 }
697
698 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
699
700 length = kernel_recvmsg(server->ssocket, &smb_msg,
701 iov, segs, to_read, 0);
702
703 if (server->tcpStatus == CifsExiting) {
704 total_read = -ESHUTDOWN;
705 break;
706 } else if (server->tcpStatus == CifsNeedReconnect) {
707 cifs_reconnect(server);
708 total_read = -EAGAIN;
709 break;
710 } else if (length == -ERESTARTSYS ||
711 length == -EAGAIN ||
712 length == -EINTR) {
713 /*
714 * Minimum sleep to prevent looping, allowing socket
715 * to clear and app threads to set tcpStatus
716 * CifsNeedReconnect if server hung.
717 */
718 usleep_range(1000, 2000);
719 length = 0;
720 continue;
721 } else if (length <= 0) {
722 cFYI(1, "Received no data or error: expecting %d "
723 "got %d", to_read, length);
724 cifs_reconnect(server);
725 total_read = -EAGAIN;
726 break;
727 }
728 }
729 return total_read;
730}
731
732int
733cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
734 unsigned int to_read)
735{
736 struct kvec iov;
737
738 iov.iov_base = buf;
739 iov.iov_len = to_read;
740
741 return cifs_readv_from_socket(server, &iov, 1, to_read);
742}
743
744static bool
745is_smb_response(struct TCP_Server_Info *server, unsigned char type)
746{
747 /*
748 * The first byte big endian of the length field,
749 * is actually not part of the length but the type
750 * with the most common, zero, as regular data.
751 */
752 switch (type) {
753 case RFC1002_SESSION_MESSAGE:
754 /* Regular SMB response */
755 return true;
756 case RFC1002_SESSION_KEEP_ALIVE:
757 cFYI(1, "RFC 1002 session keep alive");
758 break;
759 case RFC1002_POSITIVE_SESSION_RESPONSE:
760 cFYI(1, "RFC 1002 positive session response");
761 break;
762 case RFC1002_NEGATIVE_SESSION_RESPONSE:
763 /*
764 * We get this from Windows 98 instead of an error on
765 * SMB negprot response.
766 */
767 cFYI(1, "RFC 1002 negative session response");
768 /* give server a second to clean up */
769 msleep(1000);
770 /*
771 * Always try 445 first on reconnect since we get NACK
772 * on some if we ever connected to port 139 (the NACK
773 * is since we do not begin with RFC1001 session
774 * initialize frame).
775 */
776 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
777 cifs_reconnect(server);
778 wake_up(&server->response_q);
779 break;
780 default:
781 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
782 cifs_reconnect(server);
783 }
784
785 return false;
786}
787
788void
789dequeue_mid(struct mid_q_entry *mid, bool malformed)
790{
791#ifdef CONFIG_CIFS_STATS2
792 mid->when_received = jiffies;
793#endif
794 spin_lock(&GlobalMid_Lock);
795 if (!malformed)
796 mid->mid_state = MID_RESPONSE_RECEIVED;
797 else
798 mid->mid_state = MID_RESPONSE_MALFORMED;
799 list_del_init(&mid->qhead);
800 spin_unlock(&GlobalMid_Lock);
801}
802
803static void
804handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
805 char *buf, int malformed)
806{
807 if (malformed == 0 && check2ndT2(buf) > 0) {
808 mid->multiRsp = true;
809 if (mid->resp_buf) {
810 /* merge response - fix up 1st*/
811 malformed = coalesce_t2(buf, mid->resp_buf);
812 if (malformed > 0)
813 return;
814
815 /* All parts received or packet is malformed. */
816 mid->multiEnd = true;
817 return dequeue_mid(mid, malformed);
818 }
819 if (!server->large_buf) {
820 /*FIXME: switch to already allocated largebuf?*/
821 cERROR(1, "1st trans2 resp needs bigbuf");
822 } else {
823 /* Have first buffer */
824 mid->resp_buf = buf;
825 mid->large_buf = true;
826 server->bigbuf = NULL;
827 }
828 return;
829 }
830 mid->resp_buf = buf;
831 mid->large_buf = server->large_buf;
832 /* Was previous buf put in mpx struct for multi-rsp? */
833 if (!mid->multiRsp) {
834 /* smb buffer will be freed by user thread */
835 if (server->large_buf)
836 server->bigbuf = NULL;
837 else
838 server->smallbuf = NULL;
839 }
840 dequeue_mid(mid, malformed);
841}
842
843static void clean_demultiplex_info(struct TCP_Server_Info *server)
844{
845 int length;
846
847 /* take it off the list, if it's not already */
848 spin_lock(&cifs_tcp_ses_lock);
849 list_del_init(&server->tcp_ses_list);
850 spin_unlock(&cifs_tcp_ses_lock);
851
852 spin_lock(&GlobalMid_Lock);
853 server->tcpStatus = CifsExiting;
854 spin_unlock(&GlobalMid_Lock);
855 wake_up_all(&server->response_q);
856
857 /* check if we have blocked requests that need to free */
858 spin_lock(&server->req_lock);
859 if (server->credits <= 0)
860 server->credits = 1;
861 spin_unlock(&server->req_lock);
862 /*
863 * Although there should not be any requests blocked on this queue it
864 * can not hurt to be paranoid and try to wake up requests that may
865 * haven been blocked when more than 50 at time were on the wire to the
866 * same server - they now will see the session is in exit state and get
867 * out of SendReceive.
868 */
869 wake_up_all(&server->request_q);
870 /* give those requests time to exit */
871 msleep(125);
872
873 if (server->ssocket) {
874 sock_release(server->ssocket);
875 server->ssocket = NULL;
876 }
877
878 if (!list_empty(&server->pending_mid_q)) {
879 struct list_head dispose_list;
880 struct mid_q_entry *mid_entry;
881 struct list_head *tmp, *tmp2;
882
883 INIT_LIST_HEAD(&dispose_list);
884 spin_lock(&GlobalMid_Lock);
885 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
886 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
887 cFYI(1, "Clearing mid 0x%llx", mid_entry->mid);
888 mid_entry->mid_state = MID_SHUTDOWN;
889 list_move(&mid_entry->qhead, &dispose_list);
890 }
891 spin_unlock(&GlobalMid_Lock);
892
893 /* now walk dispose list and issue callbacks */
894 list_for_each_safe(tmp, tmp2, &dispose_list) {
895 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
896 cFYI(1, "Callback mid 0x%llx", mid_entry->mid);
897 list_del_init(&mid_entry->qhead);
898 mid_entry->callback(mid_entry);
899 }
900 /* 1/8th of sec is more than enough time for them to exit */
901 msleep(125);
902 }
903
904 if (!list_empty(&server->pending_mid_q)) {
905 /*
906 * mpx threads have not exited yet give them at least the smb
907 * send timeout time for long ops.
908 *
909 * Due to delays on oplock break requests, we need to wait at
910 * least 45 seconds before giving up on a request getting a
911 * response and going ahead and killing cifsd.
912 */
913 cFYI(1, "Wait for exit from demultiplex thread");
914 msleep(46000);
915 /*
916 * If threads still have not exited they are probably never
917 * coming home not much else we can do but free the memory.
918 */
919 }
920
921 kfree(server->hostname);
922 kfree(server->iov);
923 kfree(server);
924
925 length = atomic_dec_return(&tcpSesAllocCount);
926 if (length > 0)
927 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
928 GFP_KERNEL);
929}
930
931static int
932standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
933{
934 int length;
935 char *buf = server->smallbuf;
936 unsigned int pdu_length = get_rfc1002_length(buf);
937
938 /* make sure this will fit in a large buffer */
939 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
940 cERROR(1, "SMB response too long (%u bytes)",
941 pdu_length);
942 cifs_reconnect(server);
943 wake_up(&server->response_q);
944 return -EAGAIN;
945 }
946
947 /* switch to large buffer if too big for a small one */
948 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
949 server->large_buf = true;
950 memcpy(server->bigbuf, buf, server->total_read);
951 buf = server->bigbuf;
952 }
953
954 /* now read the rest */
955 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
956 pdu_length - HEADER_SIZE(server) + 1 + 4);
957 if (length < 0)
958 return length;
959 server->total_read += length;
960
961 dump_smb(buf, server->total_read);
962
963 /*
964 * We know that we received enough to get to the MID as we
965 * checked the pdu_length earlier. Now check to see
966 * if the rest of the header is OK. We borrow the length
967 * var for the rest of the loop to avoid a new stack var.
968 *
969 * 48 bytes is enough to display the header and a little bit
970 * into the payload for debugging purposes.
971 */
972 length = server->ops->check_message(buf, server->total_read);
973 if (length != 0)
974 cifs_dump_mem("Bad SMB: ", buf,
975 min_t(unsigned int, server->total_read, 48));
976
977 if (!mid)
978 return length;
979
980 handle_mid(mid, server, buf, length);
981 return 0;
982}
983
984static int
985cifs_demultiplex_thread(void *p)
986{
987 int length;
988 struct TCP_Server_Info *server = p;
989 unsigned int pdu_length;
990 char *buf = NULL;
991 struct task_struct *task_to_wake = NULL;
992 struct mid_q_entry *mid_entry;
993
994 current->flags |= PF_MEMALLOC;
995 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
996
997 length = atomic_inc_return(&tcpSesAllocCount);
998 if (length > 1)
999 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
1000 GFP_KERNEL);
1001
1002 set_freezable();
1003 while (server->tcpStatus != CifsExiting) {
1004 if (try_to_freeze())
1005 continue;
1006
1007 if (!allocate_buffers(server))
1008 continue;
1009
1010 server->large_buf = false;
1011 buf = server->smallbuf;
1012 pdu_length = 4; /* enough to get RFC1001 header */
1013
1014 length = cifs_read_from_socket(server, buf, pdu_length);
1015 if (length < 0)
1016 continue;
1017 server->total_read = length;
1018
1019 /*
1020 * The right amount was read from socket - 4 bytes,
1021 * so we can now interpret the length field.
1022 */
1023 pdu_length = get_rfc1002_length(buf);
1024
1025 cFYI(1, "RFC1002 header 0x%x", pdu_length);
1026 if (!is_smb_response(server, buf[0]))
1027 continue;
1028
1029 /* make sure we have enough to get to the MID */
1030 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
1031 cERROR(1, "SMB response too short (%u bytes)",
1032 pdu_length);
1033 cifs_reconnect(server);
1034 wake_up(&server->response_q);
1035 continue;
1036 }
1037
1038 /* read down to the MID */
1039 length = cifs_read_from_socket(server, buf + 4,
1040 HEADER_SIZE(server) - 1 - 4);
1041 if (length < 0)
1042 continue;
1043 server->total_read += length;
1044
1045 mid_entry = server->ops->find_mid(server, buf);
1046
1047 if (!mid_entry || !mid_entry->receive)
1048 length = standard_receive3(server, mid_entry);
1049 else
1050 length = mid_entry->receive(server, mid_entry);
1051
1052 if (length < 0)
1053 continue;
1054
1055 if (server->large_buf)
1056 buf = server->bigbuf;
1057
1058 server->lstrp = jiffies;
1059 if (mid_entry != NULL) {
1060 if (!mid_entry->multiRsp || mid_entry->multiEnd)
1061 mid_entry->callback(mid_entry);
1062 } else if (!server->ops->is_oplock_break ||
1063 !server->ops->is_oplock_break(buf, server)) {
1064 cERROR(1, "No task to wake, unknown frame received! "
1065 "NumMids %d", atomic_read(&midCount));
1066 cifs_dump_mem("Received Data is: ", buf,
1067 HEADER_SIZE(server));
1068#ifdef CONFIG_CIFS_DEBUG2
1069 if (server->ops->dump_detail)
1070 server->ops->dump_detail(buf);
1071 cifs_dump_mids(server);
1072#endif /* CIFS_DEBUG2 */
1073
1074 }
1075 } /* end while !EXITING */
1076
1077 /* buffer usually freed in free_mid - need to free it here on exit */
1078 cifs_buf_release(server->bigbuf);
1079 if (server->smallbuf) /* no sense logging a debug message if NULL */
1080 cifs_small_buf_release(server->smallbuf);
1081
1082 task_to_wake = xchg(&server->tsk, NULL);
1083 clean_demultiplex_info(server);
1084
1085 /* if server->tsk was NULL then wait for a signal before exiting */
1086 if (!task_to_wake) {
1087 set_current_state(TASK_INTERRUPTIBLE);
1088 while (!signal_pending(current)) {
1089 schedule();
1090 set_current_state(TASK_INTERRUPTIBLE);
1091 }
1092 set_current_state(TASK_RUNNING);
1093 }
1094
1095 module_put_and_exit(0);
1096}
1097
1098/* extract the host portion of the UNC string */
1099static char *
1100extract_hostname(const char *unc)
1101{
1102 const char *src;
1103 char *dst, *delim;
1104 unsigned int len;
1105
1106 /* skip double chars at beginning of string */
1107 /* BB: check validity of these bytes? */
1108 src = unc + 2;
1109
1110 /* delimiter between hostname and sharename is always '\\' now */
1111 delim = strchr(src, '\\');
1112 if (!delim)
1113 return ERR_PTR(-EINVAL);
1114
1115 len = delim - src;
1116 dst = kmalloc((len + 1), GFP_KERNEL);
1117 if (dst == NULL)
1118 return ERR_PTR(-ENOMEM);
1119
1120 memcpy(dst, src, len);
1121 dst[len] = '\0';
1122
1123 return dst;
1124}
1125
1126static int get_option_ul(substring_t args[], unsigned long *option)
1127{
1128 int rc;
1129 char *string;
1130
1131 string = match_strdup(args);
1132 if (string == NULL)
1133 return -ENOMEM;
1134 rc = kstrtoul(string, 0, option);
1135 kfree(string);
1136
1137 return rc;
1138}
1139
1140
1141static int cifs_parse_security_flavors(char *value,
1142 struct smb_vol *vol)
1143{
1144
1145 substring_t args[MAX_OPT_ARGS];
1146
1147 switch (match_token(value, cifs_secflavor_tokens, args)) {
1148 case Opt_sec_krb5:
1149 vol->secFlg |= CIFSSEC_MAY_KRB5;
1150 break;
1151 case Opt_sec_krb5i:
1152 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1153 break;
1154 case Opt_sec_krb5p:
1155 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1156 cERROR(1, "Krb5 cifs privacy not supported");
1157 break;
1158 case Opt_sec_ntlmssp:
1159 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1160 break;
1161 case Opt_sec_ntlmsspi:
1162 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1163 break;
1164 case Opt_ntlm:
1165 /* ntlm is default so can be turned off too */
1166 vol->secFlg |= CIFSSEC_MAY_NTLM;
1167 break;
1168 case Opt_sec_ntlmi:
1169 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1170 break;
1171 case Opt_sec_ntlmv2:
1172 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1173 break;
1174 case Opt_sec_ntlmv2i:
1175 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1176 break;
1177#ifdef CONFIG_CIFS_WEAK_PW_HASH
1178 case Opt_sec_lanman:
1179 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1180 break;
1181#endif
1182 case Opt_sec_none:
1183 vol->nullauth = 1;
1184 break;
1185 default:
1186 cERROR(1, "bad security option: %s", value);
1187 return 1;
1188 }
1189
1190 return 0;
1191}
1192
1193static int
1194cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1195{
1196 substring_t args[MAX_OPT_ARGS];
1197
1198 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1199 case Opt_cache_loose:
1200 vol->direct_io = false;
1201 vol->strict_io = false;
1202 break;
1203 case Opt_cache_strict:
1204 vol->direct_io = false;
1205 vol->strict_io = true;
1206 break;
1207 case Opt_cache_none:
1208 vol->direct_io = true;
1209 vol->strict_io = false;
1210 break;
1211 default:
1212 cERROR(1, "bad cache= option: %s", value);
1213 return 1;
1214 }
1215 return 0;
1216}
1217
1218static int
1219cifs_parse_smb_version(char *value, struct smb_vol *vol)
1220{
1221 substring_t args[MAX_OPT_ARGS];
1222
1223 switch (match_token(value, cifs_smb_version_tokens, args)) {
1224 case Smb_1:
1225 vol->ops = &smb1_operations;
1226 vol->vals = &smb1_values;
1227 break;
1228#ifdef CONFIG_CIFS_SMB2
1229 case Smb_21:
1230 vol->ops = &smb21_operations;
1231 vol->vals = &smb21_values;
1232 break;
1233#endif
1234 default:
1235 cERROR(1, "Unknown vers= option specified: %s", value);
1236 return 1;
1237 }
1238 return 0;
1239}
1240
1241static int
1242cifs_parse_mount_options(const char *mountdata, const char *devname,
1243 struct smb_vol *vol)
1244{
1245 char *data, *end;
1246 char *mountdata_copy = NULL, *options;
1247 unsigned int temp_len, i, j;
1248 char separator[2];
1249 short int override_uid = -1;
1250 short int override_gid = -1;
1251 bool uid_specified = false;
1252 bool gid_specified = false;
1253 bool sloppy = false;
1254 char *invalid = NULL;
1255 char *nodename = utsname()->nodename;
1256 char *string = NULL;
1257 char *tmp_end, *value;
1258 char delim;
1259 bool cache_specified = false;
1260 static bool cache_warned = false;
1261
1262 separator[0] = ',';
1263 separator[1] = 0;
1264 delim = separator[0];
1265
1266 /*
1267 * does not have to be perfect mapping since field is
1268 * informational, only used for servers that do not support
1269 * port 445 and it can be overridden at mount time
1270 */
1271 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1272 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1273 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1274
1275 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1276 /* null target name indicates to use *SMBSERVR default called name
1277 if we end up sending RFC1001 session initialize */
1278 vol->target_rfc1001_name[0] = 0;
1279 vol->cred_uid = current_uid();
1280 vol->linux_uid = current_uid();
1281 vol->linux_gid = current_gid();
1282
1283 /* default to only allowing write access to owner of the mount */
1284 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1285
1286 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1287 /* default is always to request posix paths. */
1288 vol->posix_paths = 1;
1289 /* default to using server inode numbers where available */
1290 vol->server_ino = 1;
1291
1292 vol->actimeo = CIFS_DEF_ACTIMEO;
1293
1294 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1295 vol->ops = &smb1_operations;
1296 vol->vals = &smb1_values;
1297
1298 if (!mountdata)
1299 goto cifs_parse_mount_err;
1300
1301 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1302 if (!mountdata_copy)
1303 goto cifs_parse_mount_err;
1304
1305 options = mountdata_copy;
1306 end = options + strlen(options);
1307
1308 if (strncmp(options, "sep=", 4) == 0) {
1309 if (options[4] != 0) {
1310 separator[0] = options[4];
1311 options += 5;
1312 } else {
1313 cFYI(1, "Null separator not allowed");
1314 }
1315 }
1316 vol->backupuid_specified = false; /* no backup intent for a user */
1317 vol->backupgid_specified = false; /* no backup intent for a group */
1318
1319 while ((data = strsep(&options, separator)) != NULL) {
1320 substring_t args[MAX_OPT_ARGS];
1321 unsigned long option;
1322 int token;
1323
1324 if (!*data)
1325 continue;
1326
1327 token = match_token(data, cifs_mount_option_tokens, args);
1328
1329 switch (token) {
1330
1331 /* Ingnore the following */
1332 case Opt_ignore:
1333 break;
1334
1335 /* Boolean values */
1336 case Opt_user_xattr:
1337 vol->no_xattr = 0;
1338 break;
1339 case Opt_nouser_xattr:
1340 vol->no_xattr = 1;
1341 break;
1342 case Opt_forceuid:
1343 override_uid = 1;
1344 break;
1345 case Opt_noforceuid:
1346 override_uid = 0;
1347 break;
1348 case Opt_noblocksend:
1349 vol->noblocksnd = 1;
1350 break;
1351 case Opt_noautotune:
1352 vol->noautotune = 1;
1353 break;
1354 case Opt_hard:
1355 vol->retry = 1;
1356 break;
1357 case Opt_soft:
1358 vol->retry = 0;
1359 break;
1360 case Opt_perm:
1361 vol->noperm = 0;
1362 break;
1363 case Opt_noperm:
1364 vol->noperm = 1;
1365 break;
1366 case Opt_mapchars:
1367 vol->remap = 1;
1368 break;
1369 case Opt_nomapchars:
1370 vol->remap = 0;
1371 break;
1372 case Opt_sfu:
1373 vol->sfu_emul = 1;
1374 break;
1375 case Opt_nosfu:
1376 vol->sfu_emul = 0;
1377 break;
1378 case Opt_nodfs:
1379 vol->nodfs = 1;
1380 break;
1381 case Opt_posixpaths:
1382 vol->posix_paths = 1;
1383 break;
1384 case Opt_noposixpaths:
1385 vol->posix_paths = 0;
1386 break;
1387 case Opt_nounix:
1388 vol->no_linux_ext = 1;
1389 break;
1390 case Opt_nocase:
1391 vol->nocase = 1;
1392 break;
1393 case Opt_brl:
1394 vol->nobrl = 0;
1395 break;
1396 case Opt_nobrl:
1397 vol->nobrl = 1;
1398 /*
1399 * turn off mandatory locking in mode
1400 * if remote locking is turned off since the
1401 * local vfs will do advisory
1402 */
1403 if (vol->file_mode ==
1404 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1405 vol->file_mode = S_IALLUGO;
1406 break;
1407 case Opt_forcemandatorylock:
1408 vol->mand_lock = 1;
1409 break;
1410 case Opt_setuids:
1411 vol->setuids = 1;
1412 break;
1413 case Opt_nosetuids:
1414 vol->setuids = 0;
1415 break;
1416 case Opt_dynperm:
1417 vol->dynperm = true;
1418 break;
1419 case Opt_nodynperm:
1420 vol->dynperm = false;
1421 break;
1422 case Opt_nohard:
1423 vol->retry = 0;
1424 break;
1425 case Opt_nosoft:
1426 vol->retry = 1;
1427 break;
1428 case Opt_nointr:
1429 vol->intr = 0;
1430 break;
1431 case Opt_intr:
1432 vol->intr = 1;
1433 break;
1434 case Opt_nostrictsync:
1435 vol->nostrictsync = 1;
1436 break;
1437 case Opt_strictsync:
1438 vol->nostrictsync = 0;
1439 break;
1440 case Opt_serverino:
1441 vol->server_ino = 1;
1442 break;
1443 case Opt_noserverino:
1444 vol->server_ino = 0;
1445 break;
1446 case Opt_rwpidforward:
1447 vol->rwpidforward = 1;
1448 break;
1449 case Opt_cifsacl:
1450 vol->cifs_acl = 1;
1451 break;
1452 case Opt_nocifsacl:
1453 vol->cifs_acl = 0;
1454 break;
1455 case Opt_acl:
1456 vol->no_psx_acl = 0;
1457 break;
1458 case Opt_noacl:
1459 vol->no_psx_acl = 1;
1460 break;
1461 case Opt_locallease:
1462 vol->local_lease = 1;
1463 break;
1464 case Opt_sign:
1465 vol->secFlg |= CIFSSEC_MUST_SIGN;
1466 break;
1467 case Opt_seal:
1468 /* we do not do the following in secFlags because seal
1469 * is a per tree connection (mount) not a per socket
1470 * or per-smb connection option in the protocol
1471 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1472 */
1473 vol->seal = 1;
1474 break;
1475 case Opt_direct:
1476 cache_specified = true;
1477 vol->direct_io = true;
1478 vol->strict_io = false;
1479 cERROR(1, "The \"directio\" option will be removed in "
1480 "3.7. Please switch to the \"cache=none\" "
1481 "option.");
1482 break;
1483 case Opt_strictcache:
1484 cache_specified = true;
1485 vol->direct_io = false;
1486 vol->strict_io = true;
1487 cERROR(1, "The \"strictcache\" option will be removed "
1488 "in 3.7. Please switch to the \"cache=strict\" "
1489 "option.");
1490 break;
1491 case Opt_noac:
1492 printk(KERN_WARNING "CIFS: Mount option noac not "
1493 "supported. Instead set "
1494 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1495 break;
1496 case Opt_fsc:
1497#ifndef CONFIG_CIFS_FSCACHE
1498 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1499 "kernel config option set");
1500 goto cifs_parse_mount_err;
1501#endif
1502 vol->fsc = true;
1503 break;
1504 case Opt_mfsymlinks:
1505 vol->mfsymlinks = true;
1506 break;
1507 case Opt_multiuser:
1508 vol->multiuser = true;
1509 break;
1510 case Opt_sloppy:
1511 sloppy = true;
1512 break;
1513
1514 /* Numeric Values */
1515 case Opt_backupuid:
1516 if (get_option_ul(args, &option)) {
1517 cERROR(1, "%s: Invalid backupuid value",
1518 __func__);
1519 goto cifs_parse_mount_err;
1520 }
1521 vol->backupuid = option;
1522 vol->backupuid_specified = true;
1523 break;
1524 case Opt_backupgid:
1525 if (get_option_ul(args, &option)) {
1526 cERROR(1, "%s: Invalid backupgid value",
1527 __func__);
1528 goto cifs_parse_mount_err;
1529 }
1530 vol->backupgid = option;
1531 vol->backupgid_specified = true;
1532 break;
1533 case Opt_uid:
1534 if (get_option_ul(args, &option)) {
1535 cERROR(1, "%s: Invalid uid value",
1536 __func__);
1537 goto cifs_parse_mount_err;
1538 }
1539 vol->linux_uid = option;
1540 uid_specified = true;
1541 break;
1542 case Opt_cruid:
1543 if (get_option_ul(args, &option)) {
1544 cERROR(1, "%s: Invalid cruid value",
1545 __func__);
1546 goto cifs_parse_mount_err;
1547 }
1548 vol->cred_uid = option;
1549 break;
1550 case Opt_gid:
1551 if (get_option_ul(args, &option)) {
1552 cERROR(1, "%s: Invalid gid value",
1553 __func__);
1554 goto cifs_parse_mount_err;
1555 }
1556 vol->linux_gid = option;
1557 gid_specified = true;
1558 break;
1559 case Opt_file_mode:
1560 if (get_option_ul(args, &option)) {
1561 cERROR(1, "%s: Invalid file_mode value",
1562 __func__);
1563 goto cifs_parse_mount_err;
1564 }
1565 vol->file_mode = option;
1566 break;
1567 case Opt_dirmode:
1568 if (get_option_ul(args, &option)) {
1569 cERROR(1, "%s: Invalid dir_mode value",
1570 __func__);
1571 goto cifs_parse_mount_err;
1572 }
1573 vol->dir_mode = option;
1574 break;
1575 case Opt_port:
1576 if (get_option_ul(args, &option)) {
1577 cERROR(1, "%s: Invalid port value",
1578 __func__);
1579 goto cifs_parse_mount_err;
1580 }
1581 vol->port = option;
1582 break;
1583 case Opt_rsize:
1584 if (get_option_ul(args, &option)) {
1585 cERROR(1, "%s: Invalid rsize value",
1586 __func__);
1587 goto cifs_parse_mount_err;
1588 }
1589 vol->rsize = option;
1590 break;
1591 case Opt_wsize:
1592 if (get_option_ul(args, &option)) {
1593 cERROR(1, "%s: Invalid wsize value",
1594 __func__);
1595 goto cifs_parse_mount_err;
1596 }
1597 vol->wsize = option;
1598 break;
1599 case Opt_actimeo:
1600 if (get_option_ul(args, &option)) {
1601 cERROR(1, "%s: Invalid actimeo value",
1602 __func__);
1603 goto cifs_parse_mount_err;
1604 }
1605 vol->actimeo = HZ * option;
1606 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1607 cERROR(1, "CIFS: attribute cache"
1608 "timeout too large");
1609 goto cifs_parse_mount_err;
1610 }
1611 break;
1612
1613 /* String Arguments */
1614
1615 case Opt_blank_user:
1616 /* null user, ie. anonymous authentication */
1617 vol->nullauth = 1;
1618 vol->username = NULL;
1619 break;
1620 case Opt_user:
1621 string = match_strdup(args);
1622 if (string == NULL)
1623 goto out_nomem;
1624
1625 if (strnlen(string, MAX_USERNAME_SIZE) >
1626 MAX_USERNAME_SIZE) {
1627 printk(KERN_WARNING "CIFS: username too long\n");
1628 goto cifs_parse_mount_err;
1629 }
1630 vol->username = kstrdup(string, GFP_KERNEL);
1631 if (!vol->username) {
1632 printk(KERN_WARNING "CIFS: no memory "
1633 "for username\n");
1634 goto cifs_parse_mount_err;
1635 }
1636 break;
1637 case Opt_blank_pass:
1638 vol->password = NULL;
1639 break;
1640 case Opt_pass:
1641 /* passwords have to be handled differently
1642 * to allow the character used for deliminator
1643 * to be passed within them
1644 */
1645
1646 /* Obtain the value string */
1647 value = strchr(data, '=');
1648 value++;
1649
1650 /* Set tmp_end to end of the string */
1651 tmp_end = (char *) value + strlen(value);
1652
1653 /* Check if following character is the deliminator
1654 * If yes, we have encountered a double deliminator
1655 * reset the NULL character to the deliminator
1656 */
1657 if (tmp_end < end && tmp_end[1] == delim) {
1658 tmp_end[0] = delim;
1659
1660 /* Keep iterating until we get to a single
1661 * deliminator OR the end
1662 */
1663 while ((tmp_end = strchr(tmp_end, delim))
1664 != NULL && (tmp_end[1] == delim)) {
1665 tmp_end = (char *) &tmp_end[2];
1666 }
1667
1668 /* Reset var options to point to next element */
1669 if (tmp_end) {
1670 tmp_end[0] = '\0';
1671 options = (char *) &tmp_end[1];
1672 } else
1673 /* Reached the end of the mount option
1674 * string */
1675 options = end;
1676 }
1677
1678 /* Now build new password string */
1679 temp_len = strlen(value);
1680 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1681 if (vol->password == NULL) {
1682 printk(KERN_WARNING "CIFS: no memory "
1683 "for password\n");
1684 goto cifs_parse_mount_err;
1685 }
1686
1687 for (i = 0, j = 0; i < temp_len; i++, j++) {
1688 vol->password[j] = value[i];
1689 if ((value[i] == delim) &&
1690 value[i+1] == delim)
1691 /* skip the second deliminator */
1692 i++;
1693 }
1694 vol->password[j] = '\0';
1695 break;
1696 case Opt_blank_ip:
1697 vol->UNCip = NULL;
1698 break;
1699 case Opt_ip:
1700 string = match_strdup(args);
1701 if (string == NULL)
1702 goto out_nomem;
1703
1704 if (strnlen(string, INET6_ADDRSTRLEN) >
1705 INET6_ADDRSTRLEN) {
1706 printk(KERN_WARNING "CIFS: ip address "
1707 "too long\n");
1708 goto cifs_parse_mount_err;
1709 }
1710 vol->UNCip = kstrdup(string, GFP_KERNEL);
1711 if (!vol->UNCip) {
1712 printk(KERN_WARNING "CIFS: no memory "
1713 "for UNC IP\n");
1714 goto cifs_parse_mount_err;
1715 }
1716 break;
1717 case Opt_unc:
1718 string = match_strdup(args);
1719 if (string == NULL)
1720 goto out_nomem;
1721
1722 temp_len = strnlen(string, 300);
1723 if (temp_len == 300) {
1724 printk(KERN_WARNING "CIFS: UNC name too long\n");
1725 goto cifs_parse_mount_err;
1726 }
1727
1728 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1729 if (vol->UNC == NULL) {
1730 printk(KERN_WARNING "CIFS: no memory for UNC\n");
1731 goto cifs_parse_mount_err;
1732 }
1733 strcpy(vol->UNC, string);
1734
1735 if (strncmp(string, "//", 2) == 0) {
1736 vol->UNC[0] = '\\';
1737 vol->UNC[1] = '\\';
1738 } else if (strncmp(string, "\\\\", 2) != 0) {
1739 printk(KERN_WARNING "CIFS: UNC Path does not "
1740 "begin with // or \\\\\n");
1741 goto cifs_parse_mount_err;
1742 }
1743
1744 break;
1745 case Opt_domain:
1746 string = match_strdup(args);
1747 if (string == NULL)
1748 goto out_nomem;
1749
1750 if (strnlen(string, 256) == 256) {
1751 printk(KERN_WARNING "CIFS: domain name too"
1752 " long\n");
1753 goto cifs_parse_mount_err;
1754 }
1755
1756 vol->domainname = kstrdup(string, GFP_KERNEL);
1757 if (!vol->domainname) {
1758 printk(KERN_WARNING "CIFS: no memory "
1759 "for domainname\n");
1760 goto cifs_parse_mount_err;
1761 }
1762 cFYI(1, "Domain name set");
1763 break;
1764 case Opt_srcaddr:
1765 string = match_strdup(args);
1766 if (string == NULL)
1767 goto out_nomem;
1768
1769 if (!cifs_convert_address(
1770 (struct sockaddr *)&vol->srcaddr,
1771 string, strlen(string))) {
1772 printk(KERN_WARNING "CIFS: Could not parse"
1773 " srcaddr: %s\n", string);
1774 goto cifs_parse_mount_err;
1775 }
1776 break;
1777 case Opt_prefixpath:
1778 string = match_strdup(args);
1779 if (string == NULL)
1780 goto out_nomem;
1781
1782 temp_len = strnlen(string, 1024);
1783 if (string[0] != '/')
1784 temp_len++; /* missing leading slash */
1785 if (temp_len > 1024) {
1786 printk(KERN_WARNING "CIFS: prefix too long\n");
1787 goto cifs_parse_mount_err;
1788 }
1789
1790 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1791 if (vol->prepath == NULL) {
1792 printk(KERN_WARNING "CIFS: no memory "
1793 "for path prefix\n");
1794 goto cifs_parse_mount_err;
1795 }
1796
1797 if (string[0] != '/') {
1798 vol->prepath[0] = '/';
1799 strcpy(vol->prepath+1, string);
1800 } else
1801 strcpy(vol->prepath, string);
1802
1803 break;
1804 case Opt_iocharset:
1805 string = match_strdup(args);
1806 if (string == NULL)
1807 goto out_nomem;
1808
1809 if (strnlen(string, 1024) >= 65) {
1810 printk(KERN_WARNING "CIFS: iocharset name "
1811 "too long.\n");
1812 goto cifs_parse_mount_err;
1813 }
1814
1815 if (strnicmp(string, "default", 7) != 0) {
1816 vol->iocharset = kstrdup(string,
1817 GFP_KERNEL);
1818 if (!vol->iocharset) {
1819 printk(KERN_WARNING "CIFS: no memory"
1820 "for charset\n");
1821 goto cifs_parse_mount_err;
1822 }
1823 }
1824 /* if iocharset not set then load_nls_default
1825 * is used by caller
1826 */
1827 cFYI(1, "iocharset set to %s", string);
1828 break;
1829 case Opt_sockopt:
1830 string = match_strdup(args);
1831 if (string == NULL)
1832 goto out_nomem;
1833
1834 if (strnicmp(string, "TCP_NODELAY", 11) == 0)
1835 vol->sockopt_tcp_nodelay = 1;
1836 break;
1837 case Opt_netbiosname:
1838 string = match_strdup(args);
1839 if (string == NULL)
1840 goto out_nomem;
1841
1842 memset(vol->source_rfc1001_name, 0x20,
1843 RFC1001_NAME_LEN);
1844 /*
1845 * FIXME: are there cases in which a comma can
1846 * be valid in workstation netbios name (and
1847 * need special handling)?
1848 */
1849 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1850 /* don't ucase netbiosname for user */
1851 if (string[i] == 0)
1852 break;
1853 vol->source_rfc1001_name[i] = string[i];
1854 }
1855 /* The string has 16th byte zero still from
1856 * set at top of the function
1857 */
1858 if (i == RFC1001_NAME_LEN && string[i] != 0)
1859 printk(KERN_WARNING "CIFS: netbiosname"
1860 " longer than 15 truncated.\n");
1861
1862 break;
1863 case Opt_servern:
1864 /* servernetbiosname specified override *SMBSERVER */
1865 string = match_strdup(args);
1866 if (string == NULL)
1867 goto out_nomem;
1868
1869 /* last byte, type, is 0x20 for servr type */
1870 memset(vol->target_rfc1001_name, 0x20,
1871 RFC1001_NAME_LEN_WITH_NULL);
1872
1873 /* BB are there cases in which a comma can be
1874 valid in this workstation netbios name
1875 (and need special handling)? */
1876
1877 /* user or mount helper must uppercase the
1878 netbios name */
1879 for (i = 0; i < 15; i++) {
1880 if (string[i] == 0)
1881 break;
1882 vol->target_rfc1001_name[i] = string[i];
1883 }
1884 /* The string has 16th byte zero still from
1885 set at top of the function */
1886 if (i == RFC1001_NAME_LEN && string[i] != 0)
1887 printk(KERN_WARNING "CIFS: server net"
1888 "biosname longer than 15 truncated.\n");
1889 break;
1890 case Opt_ver:
1891 string = match_strdup(args);
1892 if (string == NULL)
1893 goto out_nomem;
1894
1895 if (strnicmp(string, "1", 1) == 0) {
1896 /* This is the default */
1897 break;
1898 }
1899 /* For all other value, error */
1900 printk(KERN_WARNING "CIFS: Invalid version"
1901 " specified\n");
1902 goto cifs_parse_mount_err;
1903 case Opt_vers:
1904 string = match_strdup(args);
1905 if (string == NULL)
1906 goto out_nomem;
1907
1908 if (cifs_parse_smb_version(string, vol) != 0)
1909 goto cifs_parse_mount_err;
1910 break;
1911 case Opt_sec:
1912 string = match_strdup(args);
1913 if (string == NULL)
1914 goto out_nomem;
1915
1916 if (cifs_parse_security_flavors(string, vol) != 0)
1917 goto cifs_parse_mount_err;
1918 break;
1919 case Opt_cache:
1920 cache_specified = true;
1921 string = match_strdup(args);
1922 if (string == NULL)
1923 goto out_nomem;
1924
1925 if (cifs_parse_cache_flavor(string, vol) != 0)
1926 goto cifs_parse_mount_err;
1927 break;
1928 default:
1929 /*
1930 * An option we don't recognize. Save it off for later
1931 * if we haven't already found one
1932 */
1933 if (!invalid)
1934 invalid = data;
1935 break;
1936 }
1937 /* Free up any allocated string */
1938 kfree(string);
1939 string = NULL;
1940 }
1941
1942 if (!sloppy && invalid) {
1943 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1944 goto cifs_parse_mount_err;
1945 }
1946
1947#ifndef CONFIG_KEYS
1948 /* Muliuser mounts require CONFIG_KEYS support */
1949 if (vol->multiuser) {
1950 cERROR(1, "Multiuser mounts require kernels with "
1951 "CONFIG_KEYS enabled.");
1952 goto cifs_parse_mount_err;
1953 }
1954#endif
1955
1956 if (vol->UNCip == NULL)
1957 vol->UNCip = &vol->UNC[2];
1958
1959 if (uid_specified)
1960 vol->override_uid = override_uid;
1961 else if (override_uid == 1)
1962 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1963 "specified with no uid= option.\n");
1964
1965 if (gid_specified)
1966 vol->override_gid = override_gid;
1967 else if (override_gid == 1)
1968 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1969 "specified with no gid= option.\n");
1970
1971 /* FIXME: remove this block in 3.7 */
1972 if (!cache_specified && !cache_warned) {
1973 cache_warned = true;
1974 printk(KERN_NOTICE "CIFS: no cache= option specified, using "
1975 "\"cache=loose\". This default will change "
1976 "to \"cache=strict\" in 3.7.\n");
1977 }
1978
1979 kfree(mountdata_copy);
1980 return 0;
1981
1982out_nomem:
1983 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1984cifs_parse_mount_err:
1985 kfree(string);
1986 kfree(mountdata_copy);
1987 return 1;
1988}
1989
1990/** Returns true if srcaddr isn't specified and rhs isn't
1991 * specified, or if srcaddr is specified and
1992 * matches the IP address of the rhs argument.
1993 */
1994static bool
1995srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1996{
1997 switch (srcaddr->sa_family) {
1998 case AF_UNSPEC:
1999 return (rhs->sa_family == AF_UNSPEC);
2000 case AF_INET: {
2001 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2002 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2003 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2004 }
2005 case AF_INET6: {
2006 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2007 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
2008 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2009 }
2010 default:
2011 WARN_ON(1);
2012 return false; /* don't expect to be here */
2013 }
2014}
2015
2016/*
2017 * If no port is specified in addr structure, we try to match with 445 port
2018 * and if it fails - with 139 ports. It should be called only if address
2019 * families of server and addr are equal.
2020 */
2021static bool
2022match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2023{
2024 __be16 port, *sport;
2025
2026 switch (addr->sa_family) {
2027 case AF_INET:
2028 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2029 port = ((struct sockaddr_in *) addr)->sin_port;
2030 break;
2031 case AF_INET6:
2032 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2033 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2034 break;
2035 default:
2036 WARN_ON(1);
2037 return false;
2038 }
2039
2040 if (!port) {
2041 port = htons(CIFS_PORT);
2042 if (port == *sport)
2043 return true;
2044
2045 port = htons(RFC1001_PORT);
2046 }
2047
2048 return port == *sport;
2049}
2050
2051static bool
2052match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2053 struct sockaddr *srcaddr)
2054{
2055 switch (addr->sa_family) {
2056 case AF_INET: {
2057 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2058 struct sockaddr_in *srv_addr4 =
2059 (struct sockaddr_in *)&server->dstaddr;
2060
2061 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2062 return false;
2063 break;
2064 }
2065 case AF_INET6: {
2066 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2067 struct sockaddr_in6 *srv_addr6 =
2068 (struct sockaddr_in6 *)&server->dstaddr;
2069
2070 if (!ipv6_addr_equal(&addr6->sin6_addr,
2071 &srv_addr6->sin6_addr))
2072 return false;
2073 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2074 return false;
2075 break;
2076 }
2077 default:
2078 WARN_ON(1);
2079 return false; /* don't expect to be here */
2080 }
2081
2082 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2083 return false;
2084
2085 return true;
2086}
2087
2088static bool
2089match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2090{
2091 unsigned int secFlags;
2092
2093 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
2094 secFlags = vol->secFlg;
2095 else
2096 secFlags = global_secflags | vol->secFlg;
2097
2098 switch (server->secType) {
2099 case LANMAN:
2100 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
2101 return false;
2102 break;
2103 case NTLMv2:
2104 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
2105 return false;
2106 break;
2107 case NTLM:
2108 if (!(secFlags & CIFSSEC_MAY_NTLM))
2109 return false;
2110 break;
2111 case Kerberos:
2112 if (!(secFlags & CIFSSEC_MAY_KRB5))
2113 return false;
2114 break;
2115 case RawNTLMSSP:
2116 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2117 return false;
2118 break;
2119 default:
2120 /* shouldn't happen */
2121 return false;
2122 }
2123
2124 /* now check if signing mode is acceptable */
2125 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2126 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2127 return false;
2128 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2129 (server->sec_mode &
2130 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2131 return false;
2132
2133 return true;
2134}
2135
2136static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
2137 struct smb_vol *vol)
2138{
2139 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2140 return 0;
2141
2142 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2143 return 0;
2144
2145 if (!match_address(server, addr,
2146 (struct sockaddr *)&vol->srcaddr))
2147 return 0;
2148
2149 if (!match_port(server, addr))
2150 return 0;
2151
2152 if (!match_security(server, vol))
2153 return 0;
2154
2155 return 1;
2156}
2157
2158static struct TCP_Server_Info *
2159cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
2160{
2161 struct TCP_Server_Info *server;
2162
2163 spin_lock(&cifs_tcp_ses_lock);
2164 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2165 if (!match_server(server, addr, vol))
2166 continue;
2167
2168 ++server->srv_count;
2169 spin_unlock(&cifs_tcp_ses_lock);
2170 cFYI(1, "Existing tcp session with server found");
2171 return server;
2172 }
2173 spin_unlock(&cifs_tcp_ses_lock);
2174 return NULL;
2175}
2176
2177static void
2178cifs_put_tcp_session(struct TCP_Server_Info *server)
2179{
2180 struct task_struct *task;
2181
2182 spin_lock(&cifs_tcp_ses_lock);
2183 if (--server->srv_count > 0) {
2184 spin_unlock(&cifs_tcp_ses_lock);
2185 return;
2186 }
2187
2188 put_net(cifs_net_ns(server));
2189
2190 list_del_init(&server->tcp_ses_list);
2191 spin_unlock(&cifs_tcp_ses_lock);
2192
2193 cancel_delayed_work_sync(&server->echo);
2194
2195 spin_lock(&GlobalMid_Lock);
2196 server->tcpStatus = CifsExiting;
2197 spin_unlock(&GlobalMid_Lock);
2198
2199 cifs_crypto_shash_release(server);
2200 cifs_fscache_release_client_cookie(server);
2201
2202 kfree(server->session_key.response);
2203 server->session_key.response = NULL;
2204 server->session_key.len = 0;
2205
2206 task = xchg(&server->tsk, NULL);
2207 if (task)
2208 force_sig(SIGKILL, task);
2209}
2210
2211static struct TCP_Server_Info *
2212cifs_get_tcp_session(struct smb_vol *volume_info)
2213{
2214 struct TCP_Server_Info *tcp_ses = NULL;
2215 struct sockaddr_storage addr;
2216 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
2217 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
2218 int rc;
2219
2220 memset(&addr, 0, sizeof(struct sockaddr_storage));
2221
2222 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
2223
2224 if (volume_info->UNCip && volume_info->UNC) {
2225 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2226 volume_info->UNCip,
2227 strlen(volume_info->UNCip),
2228 volume_info->port);
2229 if (!rc) {
2230 /* we failed translating address */
2231 rc = -EINVAL;
2232 goto out_err;
2233 }
2234 } else if (volume_info->UNCip) {
2235 /* BB using ip addr as tcp_ses name to connect to the
2236 DFS root below */
2237 cERROR(1, "Connecting to DFS root not implemented yet");
2238 rc = -EINVAL;
2239 goto out_err;
2240 } else /* which tcp_sess DFS root would we conect to */ {
2241 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
2242 "unc=//192.168.1.100/public) specified");
2243 rc = -EINVAL;
2244 goto out_err;
2245 }
2246
2247 /* see if we already have a matching tcp_ses */
2248 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
2249 if (tcp_ses)
2250 return tcp_ses;
2251
2252 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2253 if (!tcp_ses) {
2254 rc = -ENOMEM;
2255 goto out_err;
2256 }
2257
2258 rc = cifs_crypto_shash_allocate(tcp_ses);
2259 if (rc) {
2260 cERROR(1, "could not setup hash structures rc %d", rc);
2261 goto out_err;
2262 }
2263
2264 tcp_ses->ops = volume_info->ops;
2265 tcp_ses->vals = volume_info->vals;
2266 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2267 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2268 if (IS_ERR(tcp_ses->hostname)) {
2269 rc = PTR_ERR(tcp_ses->hostname);
2270 goto out_err_crypto_release;
2271 }
2272
2273 tcp_ses->noblocksnd = volume_info->noblocksnd;
2274 tcp_ses->noautotune = volume_info->noautotune;
2275 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2276 tcp_ses->in_flight = 0;
2277 tcp_ses->credits = 1;
2278 init_waitqueue_head(&tcp_ses->response_q);
2279 init_waitqueue_head(&tcp_ses->request_q);
2280 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2281 mutex_init(&tcp_ses->srv_mutex);
2282 memcpy(tcp_ses->workstation_RFC1001_name,
2283 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2284 memcpy(tcp_ses->server_RFC1001_name,
2285 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2286 tcp_ses->session_estab = false;
2287 tcp_ses->sequence_number = 0;
2288 tcp_ses->lstrp = jiffies;
2289 spin_lock_init(&tcp_ses->req_lock);
2290 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2291 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2292 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2293
2294 /*
2295 * at this point we are the only ones with the pointer
2296 * to the struct since the kernel thread not created yet
2297 * no need to spinlock this init of tcpStatus or srv_count
2298 */
2299 tcp_ses->tcpStatus = CifsNew;
2300 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2301 sizeof(tcp_ses->srcaddr));
2302 ++tcp_ses->srv_count;
2303
2304 if (addr.ss_family == AF_INET6) {
2305 cFYI(1, "attempting ipv6 connect");
2306 /* BB should we allow ipv6 on port 139? */
2307 /* other OS never observed in Wild doing 139 with v6 */
2308 memcpy(&tcp_ses->dstaddr, sin_server6,
2309 sizeof(struct sockaddr_in6));
2310 } else
2311 memcpy(&tcp_ses->dstaddr, sin_server,
2312 sizeof(struct sockaddr_in));
2313
2314 rc = ip_connect(tcp_ses);
2315 if (rc < 0) {
2316 cERROR(1, "Error connecting to socket. Aborting operation");
2317 goto out_err_crypto_release;
2318 }
2319
2320 /*
2321 * since we're in a cifs function already, we know that
2322 * this will succeed. No need for try_module_get().
2323 */
2324 __module_get(THIS_MODULE);
2325 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2326 tcp_ses, "cifsd");
2327 if (IS_ERR(tcp_ses->tsk)) {
2328 rc = PTR_ERR(tcp_ses->tsk);
2329 cERROR(1, "error %d create cifsd thread", rc);
2330 module_put(THIS_MODULE);
2331 goto out_err_crypto_release;
2332 }
2333 tcp_ses->tcpStatus = CifsNeedNegotiate;
2334
2335 /* thread spawned, put it on the list */
2336 spin_lock(&cifs_tcp_ses_lock);
2337 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2338 spin_unlock(&cifs_tcp_ses_lock);
2339
2340 cifs_fscache_get_client_cookie(tcp_ses);
2341
2342 /* queue echo request delayed work */
2343 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2344
2345 return tcp_ses;
2346
2347out_err_crypto_release:
2348 cifs_crypto_shash_release(tcp_ses);
2349
2350 put_net(cifs_net_ns(tcp_ses));
2351
2352out_err:
2353 if (tcp_ses) {
2354 if (!IS_ERR(tcp_ses->hostname))
2355 kfree(tcp_ses->hostname);
2356 if (tcp_ses->ssocket)
2357 sock_release(tcp_ses->ssocket);
2358 kfree(tcp_ses);
2359 }
2360 return ERR_PTR(rc);
2361}
2362
2363static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2364{
2365 switch (ses->server->secType) {
2366 case Kerberos:
2367 if (vol->cred_uid != ses->cred_uid)
2368 return 0;
2369 break;
2370 default:
2371 /* NULL username means anonymous session */
2372 if (ses->user_name == NULL) {
2373 if (!vol->nullauth)
2374 return 0;
2375 break;
2376 }
2377
2378 /* anything else takes username/password */
2379 if (strncmp(ses->user_name,
2380 vol->username ? vol->username : "",
2381 MAX_USERNAME_SIZE))
2382 return 0;
2383 if (strlen(vol->username) != 0 &&
2384 ses->password != NULL &&
2385 strncmp(ses->password,
2386 vol->password ? vol->password : "",
2387 MAX_PASSWORD_SIZE))
2388 return 0;
2389 }
2390 return 1;
2391}
2392
2393static struct cifs_ses *
2394cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2395{
2396 struct cifs_ses *ses;
2397
2398 spin_lock(&cifs_tcp_ses_lock);
2399 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2400 if (!match_session(ses, vol))
2401 continue;
2402 ++ses->ses_count;
2403 spin_unlock(&cifs_tcp_ses_lock);
2404 return ses;
2405 }
2406 spin_unlock(&cifs_tcp_ses_lock);
2407 return NULL;
2408}
2409
2410static void
2411cifs_put_smb_ses(struct cifs_ses *ses)
2412{
2413 int xid;
2414 struct TCP_Server_Info *server = ses->server;
2415
2416 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
2417 spin_lock(&cifs_tcp_ses_lock);
2418 if (--ses->ses_count > 0) {
2419 spin_unlock(&cifs_tcp_ses_lock);
2420 return;
2421 }
2422
2423 list_del_init(&ses->smb_ses_list);
2424 spin_unlock(&cifs_tcp_ses_lock);
2425
2426 if (ses->status == CifsGood) {
2427 xid = GetXid();
2428 CIFSSMBLogoff(xid, ses);
2429 _FreeXid(xid);
2430 }
2431 sesInfoFree(ses);
2432 cifs_put_tcp_session(server);
2433}
2434
2435#ifdef CONFIG_KEYS
2436
2437/* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2438#define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2439
2440/* Populate username and pw fields from keyring if possible */
2441static int
2442cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2443{
2444 int rc = 0;
2445 char *desc, *delim, *payload;
2446 ssize_t len;
2447 struct key *key;
2448 struct TCP_Server_Info *server = ses->server;
2449 struct sockaddr_in *sa;
2450 struct sockaddr_in6 *sa6;
2451 struct user_key_payload *upayload;
2452
2453 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2454 if (!desc)
2455 return -ENOMEM;
2456
2457 /* try to find an address key first */
2458 switch (server->dstaddr.ss_family) {
2459 case AF_INET:
2460 sa = (struct sockaddr_in *)&server->dstaddr;
2461 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2462 break;
2463 case AF_INET6:
2464 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2465 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2466 break;
2467 default:
2468 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2469 rc = -EINVAL;
2470 goto out_err;
2471 }
2472
2473 cFYI(1, "%s: desc=%s", __func__, desc);
2474 key = request_key(&key_type_logon, desc, "");
2475 if (IS_ERR(key)) {
2476 if (!ses->domainName) {
2477 cFYI(1, "domainName is NULL");
2478 rc = PTR_ERR(key);
2479 goto out_err;
2480 }
2481
2482 /* didn't work, try to find a domain key */
2483 sprintf(desc, "cifs:d:%s", ses->domainName);
2484 cFYI(1, "%s: desc=%s", __func__, desc);
2485 key = request_key(&key_type_logon, desc, "");
2486 if (IS_ERR(key)) {
2487 rc = PTR_ERR(key);
2488 goto out_err;
2489 }
2490 }
2491
2492 down_read(&key->sem);
2493 upayload = key->payload.data;
2494 if (IS_ERR_OR_NULL(upayload)) {
2495 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2496 goto out_key_put;
2497 }
2498
2499 /* find first : in payload */
2500 payload = (char *)upayload->data;
2501 delim = strnchr(payload, upayload->datalen, ':');
2502 cFYI(1, "payload=%s", payload);
2503 if (!delim) {
2504 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2505 upayload->datalen);
2506 rc = -EINVAL;
2507 goto out_key_put;
2508 }
2509
2510 len = delim - payload;
2511 if (len > MAX_USERNAME_SIZE || len <= 0) {
2512 cFYI(1, "Bad value from username search (len=%zd)", len);
2513 rc = -EINVAL;
2514 goto out_key_put;
2515 }
2516
2517 vol->username = kstrndup(payload, len, GFP_KERNEL);
2518 if (!vol->username) {
2519 cFYI(1, "Unable to allocate %zd bytes for username", len);
2520 rc = -ENOMEM;
2521 goto out_key_put;
2522 }
2523 cFYI(1, "%s: username=%s", __func__, vol->username);
2524
2525 len = key->datalen - (len + 1);
2526 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2527 cFYI(1, "Bad len for password search (len=%zd)", len);
2528 rc = -EINVAL;
2529 kfree(vol->username);
2530 vol->username = NULL;
2531 goto out_key_put;
2532 }
2533
2534 ++delim;
2535 vol->password = kstrndup(delim, len, GFP_KERNEL);
2536 if (!vol->password) {
2537 cFYI(1, "Unable to allocate %zd bytes for password", len);
2538 rc = -ENOMEM;
2539 kfree(vol->username);
2540 vol->username = NULL;
2541 goto out_key_put;
2542 }
2543
2544out_key_put:
2545 up_read(&key->sem);
2546 key_put(key);
2547out_err:
2548 kfree(desc);
2549 cFYI(1, "%s: returning %d", __func__, rc);
2550 return rc;
2551}
2552#else /* ! CONFIG_KEYS */
2553static inline int
2554cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2555 struct cifs_ses *ses __attribute__((unused)))
2556{
2557 return -ENOSYS;
2558}
2559#endif /* CONFIG_KEYS */
2560
2561static bool warned_on_ntlm; /* globals init to false automatically */
2562
2563static struct cifs_ses *
2564cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2565{
2566 int rc = -ENOMEM, xid;
2567 struct cifs_ses *ses;
2568 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2569 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2570
2571 xid = GetXid();
2572
2573 ses = cifs_find_smb_ses(server, volume_info);
2574 if (ses) {
2575 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2576
2577 mutex_lock(&ses->session_mutex);
2578 rc = cifs_negotiate_protocol(xid, ses);
2579 if (rc) {
2580 mutex_unlock(&ses->session_mutex);
2581 /* problem -- put our ses reference */
2582 cifs_put_smb_ses(ses);
2583 FreeXid(xid);
2584 return ERR_PTR(rc);
2585 }
2586 if (ses->need_reconnect) {
2587 cFYI(1, "Session needs reconnect");
2588 rc = cifs_setup_session(xid, ses,
2589 volume_info->local_nls);
2590 if (rc) {
2591 mutex_unlock(&ses->session_mutex);
2592 /* problem -- put our reference */
2593 cifs_put_smb_ses(ses);
2594 FreeXid(xid);
2595 return ERR_PTR(rc);
2596 }
2597 }
2598 mutex_unlock(&ses->session_mutex);
2599
2600 /* existing SMB ses has a server reference already */
2601 cifs_put_tcp_session(server);
2602 FreeXid(xid);
2603 return ses;
2604 }
2605
2606 cFYI(1, "Existing smb sess not found");
2607 ses = sesInfoAlloc();
2608 if (ses == NULL)
2609 goto get_ses_fail;
2610
2611 /* new SMB session uses our server ref */
2612 ses->server = server;
2613 if (server->dstaddr.ss_family == AF_INET6)
2614 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2615 else
2616 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2617
2618 if (volume_info->username) {
2619 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2620 if (!ses->user_name)
2621 goto get_ses_fail;
2622 }
2623
2624 /* volume_info->password freed at unmount */
2625 if (volume_info->password) {
2626 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2627 if (!ses->password)
2628 goto get_ses_fail;
2629 }
2630 if (volume_info->domainname) {
2631 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2632 if (!ses->domainName)
2633 goto get_ses_fail;
2634 }
2635 ses->cred_uid = volume_info->cred_uid;
2636 ses->linux_uid = volume_info->linux_uid;
2637
2638 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2639 supported for many years, time to update default security mechanism */
2640 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2641 warned_on_ntlm = true;
2642 cERROR(1, "default security mechanism requested. The default "
2643 "security mechanism will be upgraded from ntlm to "
2644 "ntlmv2 in kernel release 3.3");
2645 }
2646 ses->overrideSecFlg = volume_info->secFlg;
2647
2648 mutex_lock(&ses->session_mutex);
2649 rc = cifs_negotiate_protocol(xid, ses);
2650 if (!rc)
2651 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2652 mutex_unlock(&ses->session_mutex);
2653 if (rc)
2654 goto get_ses_fail;
2655
2656 /* success, put it on the list */
2657 spin_lock(&cifs_tcp_ses_lock);
2658 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2659 spin_unlock(&cifs_tcp_ses_lock);
2660
2661 FreeXid(xid);
2662 return ses;
2663
2664get_ses_fail:
2665 sesInfoFree(ses);
2666 FreeXid(xid);
2667 return ERR_PTR(rc);
2668}
2669
2670static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2671{
2672 if (tcon->tidStatus == CifsExiting)
2673 return 0;
2674 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2675 return 0;
2676 return 1;
2677}
2678
2679static struct cifs_tcon *
2680cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2681{
2682 struct list_head *tmp;
2683 struct cifs_tcon *tcon;
2684
2685 spin_lock(&cifs_tcp_ses_lock);
2686 list_for_each(tmp, &ses->tcon_list) {
2687 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2688 if (!match_tcon(tcon, unc))
2689 continue;
2690 ++tcon->tc_count;
2691 spin_unlock(&cifs_tcp_ses_lock);
2692 return tcon;
2693 }
2694 spin_unlock(&cifs_tcp_ses_lock);
2695 return NULL;
2696}
2697
2698static void
2699cifs_put_tcon(struct cifs_tcon *tcon)
2700{
2701 int xid;
2702 struct cifs_ses *ses = tcon->ses;
2703
2704 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2705 spin_lock(&cifs_tcp_ses_lock);
2706 if (--tcon->tc_count > 0) {
2707 spin_unlock(&cifs_tcp_ses_lock);
2708 return;
2709 }
2710
2711 list_del_init(&tcon->tcon_list);
2712 spin_unlock(&cifs_tcp_ses_lock);
2713
2714 xid = GetXid();
2715 CIFSSMBTDis(xid, tcon);
2716 _FreeXid(xid);
2717
2718 cifs_fscache_release_super_cookie(tcon);
2719 tconInfoFree(tcon);
2720 cifs_put_smb_ses(ses);
2721}
2722
2723static struct cifs_tcon *
2724cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2725{
2726 int rc, xid;
2727 struct cifs_tcon *tcon;
2728
2729 tcon = cifs_find_tcon(ses, volume_info->UNC);
2730 if (tcon) {
2731 cFYI(1, "Found match on UNC path");
2732 /* existing tcon already has a reference */
2733 cifs_put_smb_ses(ses);
2734 if (tcon->seal != volume_info->seal)
2735 cERROR(1, "transport encryption setting "
2736 "conflicts with existing tid");
2737 return tcon;
2738 }
2739
2740 tcon = tconInfoAlloc();
2741 if (tcon == NULL) {
2742 rc = -ENOMEM;
2743 goto out_fail;
2744 }
2745
2746 tcon->ses = ses;
2747 if (volume_info->password) {
2748 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2749 if (!tcon->password) {
2750 rc = -ENOMEM;
2751 goto out_fail;
2752 }
2753 }
2754
2755 if (strchr(volume_info->UNC + 3, '\\') == NULL
2756 && strchr(volume_info->UNC + 3, '/') == NULL) {
2757 cERROR(1, "Missing share name");
2758 rc = -ENODEV;
2759 goto out_fail;
2760 }
2761
2762 /* BB Do we need to wrap session_mutex around
2763 * this TCon call and Unix SetFS as
2764 * we do on SessSetup and reconnect? */
2765 xid = GetXid();
2766 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2767 FreeXid(xid);
2768 cFYI(1, "CIFS Tcon rc = %d", rc);
2769 if (rc)
2770 goto out_fail;
2771
2772 if (volume_info->nodfs) {
2773 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2774 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2775 }
2776 tcon->seal = volume_info->seal;
2777 /* we can have only one retry value for a connection
2778 to a share so for resources mounted more than once
2779 to the same server share the last value passed in
2780 for the retry flag is used */
2781 tcon->retry = volume_info->retry;
2782 tcon->nocase = volume_info->nocase;
2783 tcon->local_lease = volume_info->local_lease;
2784
2785 spin_lock(&cifs_tcp_ses_lock);
2786 list_add(&tcon->tcon_list, &ses->tcon_list);
2787 spin_unlock(&cifs_tcp_ses_lock);
2788
2789 cifs_fscache_get_super_cookie(tcon);
2790
2791 return tcon;
2792
2793out_fail:
2794 tconInfoFree(tcon);
2795 return ERR_PTR(rc);
2796}
2797
2798void
2799cifs_put_tlink(struct tcon_link *tlink)
2800{
2801 if (!tlink || IS_ERR(tlink))
2802 return;
2803
2804 if (!atomic_dec_and_test(&tlink->tl_count) ||
2805 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2806 tlink->tl_time = jiffies;
2807 return;
2808 }
2809
2810 if (!IS_ERR(tlink_tcon(tlink)))
2811 cifs_put_tcon(tlink_tcon(tlink));
2812 kfree(tlink);
2813 return;
2814}
2815
2816static inline struct tcon_link *
2817cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2818{
2819 return cifs_sb->master_tlink;
2820}
2821
2822static int
2823compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2824{
2825 struct cifs_sb_info *old = CIFS_SB(sb);
2826 struct cifs_sb_info *new = mnt_data->cifs_sb;
2827
2828 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2829 return 0;
2830
2831 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2832 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2833 return 0;
2834
2835 /*
2836 * We want to share sb only if we don't specify an r/wsize or
2837 * specified r/wsize is greater than or equal to existing one.
2838 */
2839 if (new->wsize && new->wsize < old->wsize)
2840 return 0;
2841
2842 if (new->rsize && new->rsize < old->rsize)
2843 return 0;
2844
2845 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2846 return 0;
2847
2848 if (old->mnt_file_mode != new->mnt_file_mode ||
2849 old->mnt_dir_mode != new->mnt_dir_mode)
2850 return 0;
2851
2852 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2853 return 0;
2854
2855 if (old->actimeo != new->actimeo)
2856 return 0;
2857
2858 return 1;
2859}
2860
2861int
2862cifs_match_super(struct super_block *sb, void *data)
2863{
2864 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2865 struct smb_vol *volume_info;
2866 struct cifs_sb_info *cifs_sb;
2867 struct TCP_Server_Info *tcp_srv;
2868 struct cifs_ses *ses;
2869 struct cifs_tcon *tcon;
2870 struct tcon_link *tlink;
2871 struct sockaddr_storage addr;
2872 int rc = 0;
2873
2874 memset(&addr, 0, sizeof(struct sockaddr_storage));
2875
2876 spin_lock(&cifs_tcp_ses_lock);
2877 cifs_sb = CIFS_SB(sb);
2878 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2879 if (IS_ERR(tlink)) {
2880 spin_unlock(&cifs_tcp_ses_lock);
2881 return rc;
2882 }
2883 tcon = tlink_tcon(tlink);
2884 ses = tcon->ses;
2885 tcp_srv = ses->server;
2886
2887 volume_info = mnt_data->vol;
2888
2889 if (!volume_info->UNCip || !volume_info->UNC)
2890 goto out;
2891
2892 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2893 volume_info->UNCip,
2894 strlen(volume_info->UNCip),
2895 volume_info->port);
2896 if (!rc)
2897 goto out;
2898
2899 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2900 !match_session(ses, volume_info) ||
2901 !match_tcon(tcon, volume_info->UNC)) {
2902 rc = 0;
2903 goto out;
2904 }
2905
2906 rc = compare_mount_options(sb, mnt_data);
2907out:
2908 spin_unlock(&cifs_tcp_ses_lock);
2909 cifs_put_tlink(tlink);
2910 return rc;
2911}
2912
2913int
2914get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
2915 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2916 struct dfs_info3_param **preferrals, int remap)
2917{
2918 char *temp_unc;
2919 int rc = 0;
2920
2921 *pnum_referrals = 0;
2922 *preferrals = NULL;
2923
2924 if (pSesInfo->ipc_tid == 0) {
2925 temp_unc = kmalloc(2 /* for slashes */ +
2926 strnlen(pSesInfo->serverName,
2927 SERVER_NAME_LEN_WITH_NULL * 2)
2928 + 1 + 4 /* slash IPC$ */ + 2,
2929 GFP_KERNEL);
2930 if (temp_unc == NULL)
2931 return -ENOMEM;
2932 temp_unc[0] = '\\';
2933 temp_unc[1] = '\\';
2934 strcpy(temp_unc + 2, pSesInfo->serverName);
2935 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2936 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2937 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2938 kfree(temp_unc);
2939 }
2940 if (rc == 0)
2941 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2942 pnum_referrals, nls_codepage, remap);
2943 /* BB map targetUNCs to dfs_info3 structures, here or
2944 in CIFSGetDFSRefer BB */
2945
2946 return rc;
2947}
2948
2949#ifdef CONFIG_DEBUG_LOCK_ALLOC
2950static struct lock_class_key cifs_key[2];
2951static struct lock_class_key cifs_slock_key[2];
2952
2953static inline void
2954cifs_reclassify_socket4(struct socket *sock)
2955{
2956 struct sock *sk = sock->sk;
2957 BUG_ON(sock_owned_by_user(sk));
2958 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2959 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2960}
2961
2962static inline void
2963cifs_reclassify_socket6(struct socket *sock)
2964{
2965 struct sock *sk = sock->sk;
2966 BUG_ON(sock_owned_by_user(sk));
2967 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2968 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2969}
2970#else
2971static inline void
2972cifs_reclassify_socket4(struct socket *sock)
2973{
2974}
2975
2976static inline void
2977cifs_reclassify_socket6(struct socket *sock)
2978{
2979}
2980#endif
2981
2982/* See RFC1001 section 14 on representation of Netbios names */
2983static void rfc1002mangle(char *target, char *source, unsigned int length)
2984{
2985 unsigned int i, j;
2986
2987 for (i = 0, j = 0; i < (length); i++) {
2988 /* mask a nibble at a time and encode */
2989 target[j] = 'A' + (0x0F & (source[i] >> 4));
2990 target[j+1] = 'A' + (0x0F & source[i]);
2991 j += 2;
2992 }
2993
2994}
2995
2996static int
2997bind_socket(struct TCP_Server_Info *server)
2998{
2999 int rc = 0;
3000 if (server->srcaddr.ss_family != AF_UNSPEC) {
3001 /* Bind to the specified local IP address */
3002 struct socket *socket = server->ssocket;
3003 rc = socket->ops->bind(socket,
3004 (struct sockaddr *) &server->srcaddr,
3005 sizeof(server->srcaddr));
3006 if (rc < 0) {
3007 struct sockaddr_in *saddr4;
3008 struct sockaddr_in6 *saddr6;
3009 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3010 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3011 if (saddr6->sin6_family == AF_INET6)
3012 cERROR(1, "cifs: "
3013 "Failed to bind to: %pI6c, error: %d\n",
3014 &saddr6->sin6_addr, rc);
3015 else
3016 cERROR(1, "cifs: "
3017 "Failed to bind to: %pI4, error: %d\n",
3018 &saddr4->sin_addr.s_addr, rc);
3019 }
3020 }
3021 return rc;
3022}
3023
3024static int
3025ip_rfc1001_connect(struct TCP_Server_Info *server)
3026{
3027 int rc = 0;
3028 /*
3029 * some servers require RFC1001 sessinit before sending
3030 * negprot - BB check reconnection in case where second
3031 * sessinit is sent but no second negprot
3032 */
3033 struct rfc1002_session_packet *ses_init_buf;
3034 struct smb_hdr *smb_buf;
3035 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3036 GFP_KERNEL);
3037 if (ses_init_buf) {
3038 ses_init_buf->trailer.session_req.called_len = 32;
3039
3040 if (server->server_RFC1001_name &&
3041 server->server_RFC1001_name[0] != 0)
3042 rfc1002mangle(ses_init_buf->trailer.
3043 session_req.called_name,
3044 server->server_RFC1001_name,
3045 RFC1001_NAME_LEN_WITH_NULL);
3046 else
3047 rfc1002mangle(ses_init_buf->trailer.
3048 session_req.called_name,
3049 DEFAULT_CIFS_CALLED_NAME,
3050 RFC1001_NAME_LEN_WITH_NULL);
3051
3052 ses_init_buf->trailer.session_req.calling_len = 32;
3053
3054 /*
3055 * calling name ends in null (byte 16) from old smb
3056 * convention.
3057 */
3058 if (server->workstation_RFC1001_name &&
3059 server->workstation_RFC1001_name[0] != 0)
3060 rfc1002mangle(ses_init_buf->trailer.
3061 session_req.calling_name,
3062 server->workstation_RFC1001_name,
3063 RFC1001_NAME_LEN_WITH_NULL);
3064 else
3065 rfc1002mangle(ses_init_buf->trailer.
3066 session_req.calling_name,
3067 "LINUX_CIFS_CLNT",
3068 RFC1001_NAME_LEN_WITH_NULL);
3069
3070 ses_init_buf->trailer.session_req.scope1 = 0;
3071 ses_init_buf->trailer.session_req.scope2 = 0;
3072 smb_buf = (struct smb_hdr *)ses_init_buf;
3073
3074 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3075 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3076 rc = smb_send(server, smb_buf, 0x44);
3077 kfree(ses_init_buf);
3078 /*
3079 * RFC1001 layer in at least one server
3080 * requires very short break before negprot
3081 * presumably because not expecting negprot
3082 * to follow so fast. This is a simple
3083 * solution that works without
3084 * complicating the code and causes no
3085 * significant slowing down on mount
3086 * for everyone else
3087 */
3088 usleep_range(1000, 2000);
3089 }
3090 /*
3091 * else the negprot may still work without this
3092 * even though malloc failed
3093 */
3094
3095 return rc;
3096}
3097
3098static int
3099generic_ip_connect(struct TCP_Server_Info *server)
3100{
3101 int rc = 0;
3102 __be16 sport;
3103 int slen, sfamily;
3104 struct socket *socket = server->ssocket;
3105 struct sockaddr *saddr;
3106
3107 saddr = (struct sockaddr *) &server->dstaddr;
3108
3109 if (server->dstaddr.ss_family == AF_INET6) {
3110 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3111 slen = sizeof(struct sockaddr_in6);
3112 sfamily = AF_INET6;
3113 } else {
3114 sport = ((struct sockaddr_in *) saddr)->sin_port;
3115 slen = sizeof(struct sockaddr_in);
3116 sfamily = AF_INET;
3117 }
3118
3119 if (socket == NULL) {
3120 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3121 IPPROTO_TCP, &socket, 1);
3122 if (rc < 0) {
3123 cERROR(1, "Error %d creating socket", rc);
3124 server->ssocket = NULL;
3125 return rc;
3126 }
3127
3128 /* BB other socket options to set KEEPALIVE, NODELAY? */
3129 cFYI(1, "Socket created");
3130 server->ssocket = socket;
3131 socket->sk->sk_allocation = GFP_NOFS;
3132 if (sfamily == AF_INET6)
3133 cifs_reclassify_socket6(socket);
3134 else
3135 cifs_reclassify_socket4(socket);
3136 }
3137
3138 rc = bind_socket(server);
3139 if (rc < 0)
3140 return rc;
3141
3142 /*
3143 * Eventually check for other socket options to change from
3144 * the default. sock_setsockopt not used because it expects
3145 * user space buffer
3146 */
3147 socket->sk->sk_rcvtimeo = 7 * HZ;
3148 socket->sk->sk_sndtimeo = 5 * HZ;
3149
3150 /* make the bufsizes depend on wsize/rsize and max requests */
3151 if (server->noautotune) {
3152 if (socket->sk->sk_sndbuf < (200 * 1024))
3153 socket->sk->sk_sndbuf = 200 * 1024;
3154 if (socket->sk->sk_rcvbuf < (140 * 1024))
3155 socket->sk->sk_rcvbuf = 140 * 1024;
3156 }
3157
3158 if (server->tcp_nodelay) {
3159 int val = 1;
3160 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3161 (char *)&val, sizeof(val));
3162 if (rc)
3163 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3164 }
3165
3166 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3167 socket->sk->sk_sndbuf,
3168 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3169
3170 rc = socket->ops->connect(socket, saddr, slen, 0);
3171 if (rc < 0) {
3172 cFYI(1, "Error %d connecting to server", rc);
3173 sock_release(socket);
3174 server->ssocket = NULL;
3175 return rc;
3176 }
3177
3178 if (sport == htons(RFC1001_PORT))
3179 rc = ip_rfc1001_connect(server);
3180
3181 return rc;
3182}
3183
3184static int
3185ip_connect(struct TCP_Server_Info *server)
3186{
3187 __be16 *sport;
3188 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3189 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3190
3191 if (server->dstaddr.ss_family == AF_INET6)
3192 sport = &addr6->sin6_port;
3193 else
3194 sport = &addr->sin_port;
3195
3196 if (*sport == 0) {
3197 int rc;
3198
3199 /* try with 445 port at first */
3200 *sport = htons(CIFS_PORT);
3201
3202 rc = generic_ip_connect(server);
3203 if (rc >= 0)
3204 return rc;
3205
3206 /* if it failed, try with 139 port */
3207 *sport = htons(RFC1001_PORT);
3208 }
3209
3210 return generic_ip_connect(server);
3211}
3212
3213void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
3214 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3215{
3216 /* if we are reconnecting then should we check to see if
3217 * any requested capabilities changed locally e.g. via
3218 * remount but we can not do much about it here
3219 * if they have (even if we could detect it by the following)
3220 * Perhaps we could add a backpointer to array of sb from tcon
3221 * or if we change to make all sb to same share the same
3222 * sb as NFS - then we only have one backpointer to sb.
3223 * What if we wanted to mount the server share twice once with
3224 * and once without posixacls or posix paths? */
3225 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3226
3227 if (vol_info && vol_info->no_linux_ext) {
3228 tcon->fsUnixInfo.Capability = 0;
3229 tcon->unix_ext = 0; /* Unix Extensions disabled */
3230 cFYI(1, "Linux protocol extensions disabled");
3231 return;
3232 } else if (vol_info)
3233 tcon->unix_ext = 1; /* Unix Extensions supported */
3234
3235 if (tcon->unix_ext == 0) {
3236 cFYI(1, "Unix extensions disabled so not set on reconnect");
3237 return;
3238 }
3239
3240 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3241 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3242 cFYI(1, "unix caps which server supports %lld", cap);
3243 /* check for reconnect case in which we do not
3244 want to change the mount behavior if we can avoid it */
3245 if (vol_info == NULL) {
3246 /* turn off POSIX ACL and PATHNAMES if not set
3247 originally at mount time */
3248 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3249 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3250 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3251 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3252 cERROR(1, "POSIXPATH support change");
3253 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3254 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3255 cERROR(1, "possible reconnect error");
3256 cERROR(1, "server disabled POSIX path support");
3257 }
3258 }
3259
3260 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3261 cERROR(1, "per-share encryption not supported yet");
3262
3263 cap &= CIFS_UNIX_CAP_MASK;
3264 if (vol_info && vol_info->no_psx_acl)
3265 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3266 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3267 cFYI(1, "negotiated posix acl support");
3268 if (cifs_sb)
3269 cifs_sb->mnt_cifs_flags |=
3270 CIFS_MOUNT_POSIXACL;
3271 }
3272
3273 if (vol_info && vol_info->posix_paths == 0)
3274 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3275 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3276 cFYI(1, "negotiate posix pathnames");
3277 if (cifs_sb)
3278 cifs_sb->mnt_cifs_flags |=
3279 CIFS_MOUNT_POSIX_PATHS;
3280 }
3281
3282 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3283#ifdef CONFIG_CIFS_DEBUG2
3284 if (cap & CIFS_UNIX_FCNTL_CAP)
3285 cFYI(1, "FCNTL cap");
3286 if (cap & CIFS_UNIX_EXTATTR_CAP)
3287 cFYI(1, "EXTATTR cap");
3288 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3289 cFYI(1, "POSIX path cap");
3290 if (cap & CIFS_UNIX_XATTR_CAP)
3291 cFYI(1, "XATTR cap");
3292 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3293 cFYI(1, "POSIX ACL cap");
3294 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3295 cFYI(1, "very large read cap");
3296 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3297 cFYI(1, "very large write cap");
3298 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3299 cFYI(1, "transport encryption cap");
3300 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3301 cFYI(1, "mandatory transport encryption cap");
3302#endif /* CIFS_DEBUG2 */
3303 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3304 if (vol_info == NULL) {
3305 cFYI(1, "resetting capabilities failed");
3306 } else
3307 cERROR(1, "Negotiating Unix capabilities "
3308 "with the server failed. Consider "
3309 "mounting with the Unix Extensions\n"
3310 "disabled, if problems are found, "
3311 "by specifying the nounix mount "
3312 "option.");
3313
3314 }
3315 }
3316}
3317
3318void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3319 struct cifs_sb_info *cifs_sb)
3320{
3321 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3322
3323 spin_lock_init(&cifs_sb->tlink_tree_lock);
3324 cifs_sb->tlink_tree = RB_ROOT;
3325
3326 /*
3327 * Temporarily set r/wsize for matching superblock. If we end up using
3328 * new sb then client will later negotiate it downward if needed.
3329 */
3330 cifs_sb->rsize = pvolume_info->rsize;
3331 cifs_sb->wsize = pvolume_info->wsize;
3332
3333 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3334 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3335 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3336 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3337 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3338 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3339
3340 cifs_sb->actimeo = pvolume_info->actimeo;
3341 cifs_sb->local_nls = pvolume_info->local_nls;
3342
3343 if (pvolume_info->noperm)
3344 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3345 if (pvolume_info->setuids)
3346 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3347 if (pvolume_info->server_ino)
3348 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3349 if (pvolume_info->remap)
3350 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3351 if (pvolume_info->no_xattr)
3352 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3353 if (pvolume_info->sfu_emul)
3354 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3355 if (pvolume_info->nobrl)
3356 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3357 if (pvolume_info->nostrictsync)
3358 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3359 if (pvolume_info->mand_lock)
3360 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3361 if (pvolume_info->rwpidforward)
3362 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3363 if (pvolume_info->cifs_acl)
3364 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3365 if (pvolume_info->backupuid_specified) {
3366 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3367 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3368 }
3369 if (pvolume_info->backupgid_specified) {
3370 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3371 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3372 }
3373 if (pvolume_info->override_uid)
3374 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3375 if (pvolume_info->override_gid)
3376 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3377 if (pvolume_info->dynperm)
3378 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3379 if (pvolume_info->fsc)
3380 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3381 if (pvolume_info->multiuser)
3382 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3383 CIFS_MOUNT_NO_PERM);
3384 if (pvolume_info->strict_io)
3385 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3386 if (pvolume_info->direct_io) {
3387 cFYI(1, "mounting share using direct i/o");
3388 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3389 }
3390 if (pvolume_info->mfsymlinks) {
3391 if (pvolume_info->sfu_emul) {
3392 cERROR(1, "mount option mfsymlinks ignored if sfu "
3393 "mount option is used");
3394 } else {
3395 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3396 }
3397 }
3398
3399 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3400 cERROR(1, "mount option dynperm ignored if cifsacl "
3401 "mount option supported");
3402}
3403
3404/*
3405 * When the server supports very large reads and writes via POSIX extensions,
3406 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
3407 * including the RFC1001 length.
3408 *
3409 * Note that this might make for "interesting" allocation problems during
3410 * writeback however as we have to allocate an array of pointers for the
3411 * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
3412 *
3413 * For reads, there is a similar problem as we need to allocate an array
3414 * of kvecs to handle the receive, though that should only need to be done
3415 * once.
3416 */
3417#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
3418#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
3419
3420/*
3421 * When the server doesn't allow large posix writes, only allow a rsize/wsize
3422 * of 2^17-1 minus the size of the call header. That allows for a read or
3423 * write up to the maximum size described by RFC1002.
3424 */
3425#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
3426#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
3427
3428/*
3429 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
3430 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
3431 * a single wsize request with a single call.
3432 */
3433#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
3434
3435/*
3436 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
3437 * those values when posix extensions aren't in force. In actuality here, we
3438 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
3439 * to be ok with the extra byte even though Windows doesn't send writes that
3440 * are that large.
3441 *
3442 * Citation:
3443 *
3444 * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
3445 */
3446#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
3447#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
3448
3449/*
3450 * On hosts with high memory, we can't currently support wsize/rsize that are
3451 * larger than we can kmap at once. Cap the rsize/wsize at
3452 * LAST_PKMAP * PAGE_SIZE. We'll never be able to fill a read or write request
3453 * larger than that anyway.
3454 */
3455#ifdef CONFIG_HIGHMEM
3456#define CIFS_KMAP_SIZE_LIMIT (LAST_PKMAP * PAGE_CACHE_SIZE)
3457#else /* CONFIG_HIGHMEM */
3458#define CIFS_KMAP_SIZE_LIMIT (1<<24)
3459#endif /* CONFIG_HIGHMEM */
3460
3461static unsigned int
3462cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
3463{
3464 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3465 struct TCP_Server_Info *server = tcon->ses->server;
3466 unsigned int wsize;
3467
3468 /* start with specified wsize, or default */
3469 if (pvolume_info->wsize)
3470 wsize = pvolume_info->wsize;
3471 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
3472 wsize = CIFS_DEFAULT_IOSIZE;
3473 else
3474 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
3475
3476 /* can server support 24-bit write sizes? (via UNIX extensions) */
3477 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
3478 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
3479
3480 /*
3481 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
3482 * Limit it to max buffer offered by the server, minus the size of the
3483 * WRITEX header, not including the 4 byte RFC1001 length.
3484 */
3485 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
3486 (!(server->capabilities & CAP_UNIX) &&
3487 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
3488 wsize = min_t(unsigned int, wsize,
3489 server->maxBuf - sizeof(WRITE_REQ) + 4);
3490
3491 /* limit to the amount that we can kmap at once */
3492 wsize = min_t(unsigned int, wsize, CIFS_KMAP_SIZE_LIMIT);
3493
3494 /* hard limit of CIFS_MAX_WSIZE */
3495 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
3496
3497 return wsize;
3498}
3499
3500static unsigned int
3501cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
3502{
3503 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3504 struct TCP_Server_Info *server = tcon->ses->server;
3505 unsigned int rsize, defsize;
3506
3507 /*
3508 * Set default value...
3509 *
3510 * HACK alert! Ancient servers have very small buffers. Even though
3511 * MS-CIFS indicates that servers are only limited by the client's
3512 * bufsize for reads, testing against win98se shows that it throws
3513 * INVALID_PARAMETER errors if you try to request too large a read.
3514 * OS/2 just sends back short reads.
3515 *
3516 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
3517 * it can't handle a read request larger than its MaxBufferSize either.
3518 */
3519 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
3520 defsize = CIFS_DEFAULT_IOSIZE;
3521 else if (server->capabilities & CAP_LARGE_READ_X)
3522 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
3523 else
3524 defsize = server->maxBuf - sizeof(READ_RSP);
3525
3526 rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
3527
3528 /*
3529 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
3530 * the client's MaxBufferSize.
3531 */
3532 if (!(server->capabilities & CAP_LARGE_READ_X))
3533 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
3534
3535 /* limit to the amount that we can kmap at once */
3536 rsize = min_t(unsigned int, rsize, CIFS_KMAP_SIZE_LIMIT);
3537
3538 /* hard limit of CIFS_MAX_RSIZE */
3539 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
3540
3541 return rsize;
3542}
3543
3544static int
3545is_path_accessible(int xid, struct cifs_tcon *tcon,
3546 struct cifs_sb_info *cifs_sb, const char *full_path)
3547{
3548 int rc;
3549 FILE_ALL_INFO *pfile_info;
3550
3551 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3552 if (pfile_info == NULL)
3553 return -ENOMEM;
3554
3555 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
3556 0 /* not legacy */, cifs_sb->local_nls,
3557 cifs_sb->mnt_cifs_flags &
3558 CIFS_MOUNT_MAP_SPECIAL_CHR);
3559
3560 if (rc == -EOPNOTSUPP || rc == -EINVAL)
3561 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
3562 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
3563 CIFS_MOUNT_MAP_SPECIAL_CHR);
3564 kfree(pfile_info);
3565 return rc;
3566}
3567
3568static void
3569cleanup_volume_info_contents(struct smb_vol *volume_info)
3570{
3571 kfree(volume_info->username);
3572 kzfree(volume_info->password);
3573 if (volume_info->UNCip != volume_info->UNC + 2)
3574 kfree(volume_info->UNCip);
3575 kfree(volume_info->UNC);
3576 kfree(volume_info->domainname);
3577 kfree(volume_info->iocharset);
3578 kfree(volume_info->prepath);
3579}
3580
3581void
3582cifs_cleanup_volume_info(struct smb_vol *volume_info)
3583{
3584 if (!volume_info)
3585 return;
3586 cleanup_volume_info_contents(volume_info);
3587 kfree(volume_info);
3588}
3589
3590
3591#ifdef CONFIG_CIFS_DFS_UPCALL
3592/* build_path_to_root returns full path to root when
3593 * we do not have an exiting connection (tcon) */
3594static char *
3595build_unc_path_to_root(const struct smb_vol *vol,
3596 const struct cifs_sb_info *cifs_sb)
3597{
3598 char *full_path, *pos;
3599 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
3600 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3601
3602 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3603 if (full_path == NULL)
3604 return ERR_PTR(-ENOMEM);
3605
3606 strncpy(full_path, vol->UNC, unc_len);
3607 pos = full_path + unc_len;
3608
3609 if (pplen) {
3610 strncpy(pos, vol->prepath, pplen);
3611 pos += pplen;
3612 }
3613
3614 *pos = '\0'; /* add trailing null */
3615 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3616 cFYI(1, "%s: full_path=%s", __func__, full_path);
3617 return full_path;
3618}
3619
3620/*
3621 * Perform a dfs referral query for a share and (optionally) prefix
3622 *
3623 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3624 * to a string containing updated options for the submount. Otherwise it
3625 * will be left untouched.
3626 *
3627 * Returns the rc from get_dfs_path to the caller, which can be used to
3628 * determine whether there were referrals.
3629 */
3630static int
3631expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
3632 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3633 int check_prefix)
3634{
3635 int rc;
3636 unsigned int num_referrals = 0;
3637 struct dfs_info3_param *referrals = NULL;
3638 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3639
3640 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3641 if (IS_ERR(full_path))
3642 return PTR_ERR(full_path);
3643
3644 /* For DFS paths, skip the first '\' of the UNC */
3645 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3646
3647 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
3648 &num_referrals, &referrals,
3649 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3650
3651 if (!rc && num_referrals > 0) {
3652 char *fake_devname = NULL;
3653
3654 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3655 full_path + 1, referrals,
3656 &fake_devname);
3657
3658 free_dfs_info_array(referrals, num_referrals);
3659
3660 if (IS_ERR(mdata)) {
3661 rc = PTR_ERR(mdata);
3662 mdata = NULL;
3663 } else {
3664 cleanup_volume_info_contents(volume_info);
3665 memset(volume_info, '\0', sizeof(*volume_info));
3666 rc = cifs_setup_volume_info(volume_info, mdata,
3667 fake_devname);
3668 }
3669 kfree(fake_devname);
3670 kfree(cifs_sb->mountdata);
3671 cifs_sb->mountdata = mdata;
3672 }
3673 kfree(full_path);
3674 return rc;
3675}
3676#endif
3677
3678static int
3679cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3680 const char *devname)
3681{
3682 int rc = 0;
3683
3684 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3685 return -EINVAL;
3686
3687
3688 if (volume_info->nullauth) {
3689 cFYI(1, "Anonymous login");
3690 kfree(volume_info->username);
3691 volume_info->username = NULL;
3692 } else if (volume_info->username) {
3693 /* BB fixme parse for domain name here */
3694 cFYI(1, "Username: %s", volume_info->username);
3695 } else {
3696 cifserror("No username specified");
3697 /* In userspace mount helper we can get user name from alternate
3698 locations such as env variables and files on disk */
3699 return -EINVAL;
3700 }
3701
3702 /* this is needed for ASCII cp to Unicode converts */
3703 if (volume_info->iocharset == NULL) {
3704 /* load_nls_default cannot return null */
3705 volume_info->local_nls = load_nls_default();
3706 } else {
3707 volume_info->local_nls = load_nls(volume_info->iocharset);
3708 if (volume_info->local_nls == NULL) {
3709 cERROR(1, "CIFS mount error: iocharset %s not found",
3710 volume_info->iocharset);
3711 return -ELIBACC;
3712 }
3713 }
3714
3715 return rc;
3716}
3717
3718struct smb_vol *
3719cifs_get_volume_info(char *mount_data, const char *devname)
3720{
3721 int rc;
3722 struct smb_vol *volume_info;
3723
3724 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3725 if (!volume_info)
3726 return ERR_PTR(-ENOMEM);
3727
3728 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3729 if (rc) {
3730 cifs_cleanup_volume_info(volume_info);
3731 volume_info = ERR_PTR(rc);
3732 }
3733
3734 return volume_info;
3735}
3736
3737int
3738cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3739{
3740 int rc;
3741 int xid;
3742 struct cifs_ses *pSesInfo;
3743 struct cifs_tcon *tcon;
3744 struct TCP_Server_Info *srvTcp;
3745 char *full_path;
3746 struct tcon_link *tlink;
3747#ifdef CONFIG_CIFS_DFS_UPCALL
3748 int referral_walks_count = 0;
3749#endif
3750
3751 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3752 if (rc)
3753 return rc;
3754
3755#ifdef CONFIG_CIFS_DFS_UPCALL
3756try_mount_again:
3757 /* cleanup activities if we're chasing a referral */
3758 if (referral_walks_count) {
3759 if (tcon)
3760 cifs_put_tcon(tcon);
3761 else if (pSesInfo)
3762 cifs_put_smb_ses(pSesInfo);
3763
3764 FreeXid(xid);
3765 }
3766#endif
3767 rc = 0;
3768 tcon = NULL;
3769 pSesInfo = NULL;
3770 srvTcp = NULL;
3771 full_path = NULL;
3772 tlink = NULL;
3773
3774 xid = GetXid();
3775
3776 /* get a reference to a tcp session */
3777 srvTcp = cifs_get_tcp_session(volume_info);
3778 if (IS_ERR(srvTcp)) {
3779 rc = PTR_ERR(srvTcp);
3780 bdi_destroy(&cifs_sb->bdi);
3781 goto out;
3782 }
3783
3784 /* get a reference to a SMB session */
3785 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3786 if (IS_ERR(pSesInfo)) {
3787 rc = PTR_ERR(pSesInfo);
3788 pSesInfo = NULL;
3789 goto mount_fail_check;
3790 }
3791
3792 /* search for existing tcon to this server share */
3793 tcon = cifs_get_tcon(pSesInfo, volume_info);
3794 if (IS_ERR(tcon)) {
3795 rc = PTR_ERR(tcon);
3796 tcon = NULL;
3797 goto remote_path_check;
3798 }
3799
3800 /* tell server which Unix caps we support */
3801 if (tcon->ses->capabilities & CAP_UNIX) {
3802 /* reset of caps checks mount to see if unix extensions
3803 disabled for just this mount */
3804 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3805 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3806 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3807 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3808 rc = -EACCES;
3809 goto mount_fail_check;
3810 }
3811 } else
3812 tcon->unix_ext = 0; /* server does not support them */
3813
3814 /* do not care if following two calls succeed - informational */
3815 if (!tcon->ipc) {
3816 CIFSSMBQFSDeviceInfo(xid, tcon);
3817 CIFSSMBQFSAttributeInfo(xid, tcon);
3818 }
3819
3820 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3821 cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
3822
3823 /* tune readahead according to rsize */
3824 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3825
3826remote_path_check:
3827#ifdef CONFIG_CIFS_DFS_UPCALL
3828 /*
3829 * Perform an unconditional check for whether there are DFS
3830 * referrals for this path without prefix, to provide support
3831 * for DFS referrals from w2k8 servers which don't seem to respond
3832 * with PATH_NOT_COVERED to requests that include the prefix.
3833 * Chase the referral if found, otherwise continue normally.
3834 */
3835 if (referral_walks_count == 0) {
3836 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3837 cifs_sb, false);
3838 if (!refrc) {
3839 referral_walks_count++;
3840 goto try_mount_again;
3841 }
3842 }
3843#endif
3844
3845 /* check if a whole path is not remote */
3846 if (!rc && tcon) {
3847 /* build_path_to_root works only when we have a valid tcon */
3848 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3849 if (full_path == NULL) {
3850 rc = -ENOMEM;
3851 goto mount_fail_check;
3852 }
3853 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3854 if (rc != 0 && rc != -EREMOTE) {
3855 kfree(full_path);
3856 goto mount_fail_check;
3857 }
3858 kfree(full_path);
3859 }
3860
3861 /* get referral if needed */
3862 if (rc == -EREMOTE) {
3863#ifdef CONFIG_CIFS_DFS_UPCALL
3864 if (referral_walks_count > MAX_NESTED_LINKS) {
3865 /*
3866 * BB: when we implement proper loop detection,
3867 * we will remove this check. But now we need it
3868 * to prevent an indefinite loop if 'DFS tree' is
3869 * misconfigured (i.e. has loops).
3870 */
3871 rc = -ELOOP;
3872 goto mount_fail_check;
3873 }
3874
3875 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3876 true);
3877
3878 if (!rc) {
3879 referral_walks_count++;
3880 goto try_mount_again;
3881 }
3882 goto mount_fail_check;
3883#else /* No DFS support, return error on mount */
3884 rc = -EOPNOTSUPP;
3885#endif
3886 }
3887
3888 if (rc)
3889 goto mount_fail_check;
3890
3891 /* now, hang the tcon off of the superblock */
3892 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3893 if (tlink == NULL) {
3894 rc = -ENOMEM;
3895 goto mount_fail_check;
3896 }
3897
3898 tlink->tl_uid = pSesInfo->linux_uid;
3899 tlink->tl_tcon = tcon;
3900 tlink->tl_time = jiffies;
3901 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3902 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3903
3904 cifs_sb->master_tlink = tlink;
3905 spin_lock(&cifs_sb->tlink_tree_lock);
3906 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3907 spin_unlock(&cifs_sb->tlink_tree_lock);
3908
3909 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3910 TLINK_IDLE_EXPIRE);
3911
3912mount_fail_check:
3913 /* on error free sesinfo and tcon struct if needed */
3914 if (rc) {
3915 /* If find_unc succeeded then rc == 0 so we can not end */
3916 /* up accidentally freeing someone elses tcon struct */
3917 if (tcon)
3918 cifs_put_tcon(tcon);
3919 else if (pSesInfo)
3920 cifs_put_smb_ses(pSesInfo);
3921 else
3922 cifs_put_tcp_session(srvTcp);
3923 bdi_destroy(&cifs_sb->bdi);
3924 }
3925
3926out:
3927 FreeXid(xid);
3928 return rc;
3929}
3930
3931/*
3932 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3933 * pointer may be NULL.
3934 */
3935int
3936CIFSTCon(unsigned int xid, struct cifs_ses *ses,
3937 const char *tree, struct cifs_tcon *tcon,
3938 const struct nls_table *nls_codepage)
3939{
3940 struct smb_hdr *smb_buffer;
3941 struct smb_hdr *smb_buffer_response;
3942 TCONX_REQ *pSMB;
3943 TCONX_RSP *pSMBr;
3944 unsigned char *bcc_ptr;
3945 int rc = 0;
3946 int length;
3947 __u16 bytes_left, count;
3948
3949 if (ses == NULL)
3950 return -EIO;
3951
3952 smb_buffer = cifs_buf_get();
3953 if (smb_buffer == NULL)
3954 return -ENOMEM;
3955
3956 smb_buffer_response = smb_buffer;
3957
3958 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3959 NULL /*no tid */ , 4 /*wct */ );
3960
3961 smb_buffer->Mid = get_next_mid(ses->server);
3962 smb_buffer->Uid = ses->Suid;
3963 pSMB = (TCONX_REQ *) smb_buffer;
3964 pSMBr = (TCONX_RSP *) smb_buffer_response;
3965
3966 pSMB->AndXCommand = 0xFF;
3967 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3968 bcc_ptr = &pSMB->Password[0];
3969 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3970 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3971 *bcc_ptr = 0; /* password is null byte */
3972 bcc_ptr++; /* skip password */
3973 /* already aligned so no need to do it below */
3974 } else {
3975 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3976 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3977 specified as required (when that support is added to
3978 the vfs in the future) as only NTLM or the much
3979 weaker LANMAN (which we do not send by default) is accepted
3980 by Samba (not sure whether other servers allow
3981 NTLMv2 password here) */
3982#ifdef CONFIG_CIFS_WEAK_PW_HASH
3983 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3984 (ses->server->secType == LANMAN))
3985 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3986 ses->server->sec_mode &
3987 SECMODE_PW_ENCRYPT ? true : false,
3988 bcc_ptr);
3989 else
3990#endif /* CIFS_WEAK_PW_HASH */
3991 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3992 bcc_ptr, nls_codepage);
3993
3994 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3995 if (ses->capabilities & CAP_UNICODE) {
3996 /* must align unicode strings */
3997 *bcc_ptr = 0; /* null byte password */
3998 bcc_ptr++;
3999 }
4000 }
4001
4002 if (ses->server->sec_mode &
4003 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
4004 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4005
4006 if (ses->capabilities & CAP_STATUS32) {
4007 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4008 }
4009 if (ses->capabilities & CAP_DFS) {
4010 smb_buffer->Flags2 |= SMBFLG2_DFS;
4011 }
4012 if (ses->capabilities & CAP_UNICODE) {
4013 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4014 length =
4015 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4016 6 /* max utf8 char length in bytes */ *
4017 (/* server len*/ + 256 /* share len */), nls_codepage);
4018 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4019 bcc_ptr += 2; /* skip trailing null */
4020 } else { /* ASCII */
4021 strcpy(bcc_ptr, tree);
4022 bcc_ptr += strlen(tree) + 1;
4023 }
4024 strcpy(bcc_ptr, "?????");
4025 bcc_ptr += strlen("?????");
4026 bcc_ptr += 1;
4027 count = bcc_ptr - &pSMB->Password[0];
4028 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4029 pSMB->hdr.smb_buf_length) + count);
4030 pSMB->ByteCount = cpu_to_le16(count);
4031
4032 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4033 0);
4034
4035 /* above now done in SendReceive */
4036 if ((rc == 0) && (tcon != NULL)) {
4037 bool is_unicode;
4038
4039 tcon->tidStatus = CifsGood;
4040 tcon->need_reconnect = false;
4041 tcon->tid = smb_buffer_response->Tid;
4042 bcc_ptr = pByteArea(smb_buffer_response);
4043 bytes_left = get_bcc(smb_buffer_response);
4044 length = strnlen(bcc_ptr, bytes_left - 2);
4045 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4046 is_unicode = true;
4047 else
4048 is_unicode = false;
4049
4050
4051 /* skip service field (NB: this field is always ASCII) */
4052 if (length == 3) {
4053 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4054 (bcc_ptr[2] == 'C')) {
4055 cFYI(1, "IPC connection");
4056 tcon->ipc = 1;
4057 }
4058 } else if (length == 2) {
4059 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4060 /* the most common case */
4061 cFYI(1, "disk share connection");
4062 }
4063 }
4064 bcc_ptr += length + 1;
4065 bytes_left -= (length + 1);
4066 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
4067
4068 /* mostly informational -- no need to fail on error here */
4069 kfree(tcon->nativeFileSystem);
4070 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4071 bytes_left, is_unicode,
4072 nls_codepage);
4073
4074 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
4075
4076 if ((smb_buffer_response->WordCount == 3) ||
4077 (smb_buffer_response->WordCount == 7))
4078 /* field is in same location */
4079 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4080 else
4081 tcon->Flags = 0;
4082 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
4083 } else if ((rc == 0) && tcon == NULL) {
4084 /* all we need to save for IPC$ connection */
4085 ses->ipc_tid = smb_buffer_response->Tid;
4086 }
4087
4088 cifs_buf_release(smb_buffer);
4089 return rc;
4090}
4091
4092void
4093cifs_umount(struct cifs_sb_info *cifs_sb)
4094{
4095 struct rb_root *root = &cifs_sb->tlink_tree;
4096 struct rb_node *node;
4097 struct tcon_link *tlink;
4098
4099 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4100
4101 spin_lock(&cifs_sb->tlink_tree_lock);
4102 while ((node = rb_first(root))) {
4103 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4104 cifs_get_tlink(tlink);
4105 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4106 rb_erase(node, root);
4107
4108 spin_unlock(&cifs_sb->tlink_tree_lock);
4109 cifs_put_tlink(tlink);
4110 spin_lock(&cifs_sb->tlink_tree_lock);
4111 }
4112 spin_unlock(&cifs_sb->tlink_tree_lock);
4113
4114 bdi_destroy(&cifs_sb->bdi);
4115 kfree(cifs_sb->mountdata);
4116 unload_nls(cifs_sb->local_nls);
4117 kfree(cifs_sb);
4118}
4119
4120int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
4121{
4122 int rc = 0;
4123 struct TCP_Server_Info *server = ses->server;
4124
4125 /* only send once per connect */
4126 if (server->maxBuf != 0)
4127 return 0;
4128
4129 set_credits(server, 1);
4130 rc = CIFSSMBNegotiate(xid, ses);
4131 if (rc == -EAGAIN) {
4132 /* retry only once on 1st time connection */
4133 set_credits(server, 1);
4134 rc = CIFSSMBNegotiate(xid, ses);
4135 if (rc == -EAGAIN)
4136 rc = -EHOSTDOWN;
4137 }
4138 if (rc == 0) {
4139 spin_lock(&GlobalMid_Lock);
4140 if (server->tcpStatus == CifsNeedNegotiate)
4141 server->tcpStatus = CifsGood;
4142 else
4143 rc = -EHOSTDOWN;
4144 spin_unlock(&GlobalMid_Lock);
4145
4146 }
4147
4148 return rc;
4149}
4150
4151
4152int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
4153 struct nls_table *nls_info)
4154{
4155 int rc = 0;
4156 struct TCP_Server_Info *server = ses->server;
4157
4158 ses->flags = 0;
4159 ses->capabilities = server->capabilities;
4160 if (linuxExtEnabled == 0)
4161 ses->capabilities &= (~CAP_UNIX);
4162
4163 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
4164 server->sec_mode, server->capabilities, server->timeAdj);
4165
4166 rc = CIFS_SessSetup(xid, ses, nls_info);
4167 if (rc) {
4168 cERROR(1, "Send error in SessSetup = %d", rc);
4169 } else {
4170 mutex_lock(&ses->server->srv_mutex);
4171 if (!server->session_estab) {
4172 server->session_key.response = ses->auth_key.response;
4173 server->session_key.len = ses->auth_key.len;
4174 server->sequence_number = 0x2;
4175 server->session_estab = true;
4176 ses->auth_key.response = NULL;
4177 }
4178 mutex_unlock(&server->srv_mutex);
4179
4180 cFYI(1, "CIFS Session Established successfully");
4181 spin_lock(&GlobalMid_Lock);
4182 ses->status = CifsGood;
4183 ses->need_reconnect = false;
4184 spin_unlock(&GlobalMid_Lock);
4185 }
4186
4187 kfree(ses->auth_key.response);
4188 ses->auth_key.response = NULL;
4189 ses->auth_key.len = 0;
4190 kfree(ses->ntlmssp);
4191 ses->ntlmssp = NULL;
4192
4193 return rc;
4194}
4195
4196static int
4197cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4198{
4199 switch (ses->server->secType) {
4200 case Kerberos:
4201 vol->secFlg = CIFSSEC_MUST_KRB5;
4202 return 0;
4203 case NTLMv2:
4204 vol->secFlg = CIFSSEC_MUST_NTLMV2;
4205 break;
4206 case NTLM:
4207 vol->secFlg = CIFSSEC_MUST_NTLM;
4208 break;
4209 case RawNTLMSSP:
4210 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
4211 break;
4212 case LANMAN:
4213 vol->secFlg = CIFSSEC_MUST_LANMAN;
4214 break;
4215 }
4216
4217 return cifs_set_cifscreds(vol, ses);
4218}
4219
4220static struct cifs_tcon *
4221cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
4222{
4223 int rc;
4224 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4225 struct cifs_ses *ses;
4226 struct cifs_tcon *tcon = NULL;
4227 struct smb_vol *vol_info;
4228
4229 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4230 if (vol_info == NULL)
4231 return ERR_PTR(-ENOMEM);
4232
4233 vol_info->local_nls = cifs_sb->local_nls;
4234 vol_info->linux_uid = fsuid;
4235 vol_info->cred_uid = fsuid;
4236 vol_info->UNC = master_tcon->treeName;
4237 vol_info->retry = master_tcon->retry;
4238 vol_info->nocase = master_tcon->nocase;
4239 vol_info->local_lease = master_tcon->local_lease;
4240 vol_info->no_linux_ext = !master_tcon->unix_ext;
4241
4242 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4243 if (rc) {
4244 tcon = ERR_PTR(rc);
4245 goto out;
4246 }
4247
4248 /* get a reference for the same TCP session */
4249 spin_lock(&cifs_tcp_ses_lock);
4250 ++master_tcon->ses->server->srv_count;
4251 spin_unlock(&cifs_tcp_ses_lock);
4252
4253 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4254 if (IS_ERR(ses)) {
4255 tcon = (struct cifs_tcon *)ses;
4256 cifs_put_tcp_session(master_tcon->ses->server);
4257 goto out;
4258 }
4259
4260 tcon = cifs_get_tcon(ses, vol_info);
4261 if (IS_ERR(tcon)) {
4262 cifs_put_smb_ses(ses);
4263 goto out;
4264 }
4265
4266 if (ses->capabilities & CAP_UNIX)
4267 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4268out:
4269 kfree(vol_info->username);
4270 kfree(vol_info->password);
4271 kfree(vol_info);
4272
4273 return tcon;
4274}
4275
4276struct cifs_tcon *
4277cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4278{
4279 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4280}
4281
4282static int
4283cifs_sb_tcon_pending_wait(void *unused)
4284{
4285 schedule();
4286 return signal_pending(current) ? -ERESTARTSYS : 0;
4287}
4288
4289/* find and return a tlink with given uid */
4290static struct tcon_link *
4291tlink_rb_search(struct rb_root *root, uid_t uid)
4292{
4293 struct rb_node *node = root->rb_node;
4294 struct tcon_link *tlink;
4295
4296 while (node) {
4297 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4298
4299 if (tlink->tl_uid > uid)
4300 node = node->rb_left;
4301 else if (tlink->tl_uid < uid)
4302 node = node->rb_right;
4303 else
4304 return tlink;
4305 }
4306 return NULL;
4307}
4308
4309/* insert a tcon_link into the tree */
4310static void
4311tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4312{
4313 struct rb_node **new = &(root->rb_node), *parent = NULL;
4314 struct tcon_link *tlink;
4315
4316 while (*new) {
4317 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4318 parent = *new;
4319
4320 if (tlink->tl_uid > new_tlink->tl_uid)
4321 new = &((*new)->rb_left);
4322 else
4323 new = &((*new)->rb_right);
4324 }
4325
4326 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4327 rb_insert_color(&new_tlink->tl_rbnode, root);
4328}
4329
4330/*
4331 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4332 * current task.
4333 *
4334 * If the superblock doesn't refer to a multiuser mount, then just return
4335 * the master tcon for the mount.
4336 *
4337 * First, search the rbtree for an existing tcon for this fsuid. If one
4338 * exists, then check to see if it's pending construction. If it is then wait
4339 * for construction to complete. Once it's no longer pending, check to see if
4340 * it failed and either return an error or retry construction, depending on
4341 * the timeout.
4342 *
4343 * If one doesn't exist then insert a new tcon_link struct into the tree and
4344 * try to construct a new one.
4345 */
4346struct tcon_link *
4347cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4348{
4349 int ret;
4350 uid_t fsuid = current_fsuid();
4351 struct tcon_link *tlink, *newtlink;
4352
4353 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4354 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4355
4356 spin_lock(&cifs_sb->tlink_tree_lock);
4357 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4358 if (tlink)
4359 cifs_get_tlink(tlink);
4360 spin_unlock(&cifs_sb->tlink_tree_lock);
4361
4362 if (tlink == NULL) {
4363 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4364 if (newtlink == NULL)
4365 return ERR_PTR(-ENOMEM);
4366 newtlink->tl_uid = fsuid;
4367 newtlink->tl_tcon = ERR_PTR(-EACCES);
4368 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4369 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4370 cifs_get_tlink(newtlink);
4371
4372 spin_lock(&cifs_sb->tlink_tree_lock);
4373 /* was one inserted after previous search? */
4374 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4375 if (tlink) {
4376 cifs_get_tlink(tlink);
4377 spin_unlock(&cifs_sb->tlink_tree_lock);
4378 kfree(newtlink);
4379 goto wait_for_construction;
4380 }
4381 tlink = newtlink;
4382 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4383 spin_unlock(&cifs_sb->tlink_tree_lock);
4384 } else {
4385wait_for_construction:
4386 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4387 cifs_sb_tcon_pending_wait,
4388 TASK_INTERRUPTIBLE);
4389 if (ret) {
4390 cifs_put_tlink(tlink);
4391 return ERR_PTR(ret);
4392 }
4393
4394 /* if it's good, return it */
4395 if (!IS_ERR(tlink->tl_tcon))
4396 return tlink;
4397
4398 /* return error if we tried this already recently */
4399 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4400 cifs_put_tlink(tlink);
4401 return ERR_PTR(-EACCES);
4402 }
4403
4404 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4405 goto wait_for_construction;
4406 }
4407
4408 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4409 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4410 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4411
4412 if (IS_ERR(tlink->tl_tcon)) {
4413 cifs_put_tlink(tlink);
4414 return ERR_PTR(-EACCES);
4415 }
4416
4417 return tlink;
4418}
4419
4420/*
4421 * periodic workqueue job that scans tcon_tree for a superblock and closes
4422 * out tcons.
4423 */
4424static void
4425cifs_prune_tlinks(struct work_struct *work)
4426{
4427 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4428 prune_tlinks.work);
4429 struct rb_root *root = &cifs_sb->tlink_tree;
4430 struct rb_node *node = rb_first(root);
4431 struct rb_node *tmp;
4432 struct tcon_link *tlink;
4433
4434 /*
4435 * Because we drop the spinlock in the loop in order to put the tlink
4436 * it's not guarded against removal of links from the tree. The only
4437 * places that remove entries from the tree are this function and
4438 * umounts. Because this function is non-reentrant and is canceled
4439 * before umount can proceed, this is safe.
4440 */
4441 spin_lock(&cifs_sb->tlink_tree_lock);
4442 node = rb_first(root);
4443 while (node != NULL) {
4444 tmp = node;
4445 node = rb_next(tmp);
4446 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4447
4448 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4449 atomic_read(&tlink->tl_count) != 0 ||
4450 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4451 continue;
4452
4453 cifs_get_tlink(tlink);
4454 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4455 rb_erase(tmp, root);
4456
4457 spin_unlock(&cifs_sb->tlink_tree_lock);
4458 cifs_put_tlink(tlink);
4459 spin_lock(&cifs_sb->tlink_tree_lock);
4460 }
4461 spin_unlock(&cifs_sb->tlink_tree_lock);
4462
4463 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4464 TLINK_IDLE_EXPIRE);
4465}
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 <linux/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#include <linux/bvec.h>
45
46#include "cifspdu.h"
47#include "cifsglob.h"
48#include "cifsproto.h"
49#include "cifs_unicode.h"
50#include "cifs_debug.h"
51#include "cifs_fs_sb.h"
52#include "ntlmssp.h"
53#include "nterr.h"
54#include "rfc1002pdu.h"
55#include "fscache.h"
56#ifdef CONFIG_CIFS_SMB2
57#include "smb2proto.h"
58#endif
59
60#define CIFS_PORT 445
61#define RFC1001_PORT 139
62
63extern mempool_t *cifs_req_poolp;
64
65/* FIXME: should these be tunable? */
66#define TLINK_ERROR_EXPIRE (1 * HZ)
67#define TLINK_IDLE_EXPIRE (600 * HZ)
68
69enum {
70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
73 Opt_forcegid, Opt_noforcegid,
74 Opt_noblocksend, Opt_noautotune,
75 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
76 Opt_mapposix, Opt_nomapposix,
77 Opt_mapchars, Opt_nomapchars, Opt_sfu,
78 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
79 Opt_noposixpaths, Opt_nounix,
80 Opt_nocase,
81 Opt_brl, Opt_nobrl,
82 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
83 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
84 Opt_nohard, Opt_nosoft,
85 Opt_nointr, Opt_intr,
86 Opt_nostrictsync, Opt_strictsync,
87 Opt_serverino, Opt_noserverino,
88 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
89 Opt_acl, Opt_noacl, Opt_locallease,
90 Opt_sign, Opt_seal, Opt_noac,
91 Opt_fsc, Opt_mfsymlinks,
92 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
93 Opt_persistent, Opt_nopersistent,
94 Opt_resilient, Opt_noresilient,
95 Opt_domainauto,
96
97 /* Mount options which take numeric value */
98 Opt_backupuid, Opt_backupgid, Opt_uid,
99 Opt_cruid, Opt_gid, Opt_file_mode,
100 Opt_dirmode, Opt_port,
101 Opt_rsize, Opt_wsize, Opt_actimeo,
102 Opt_echo_interval, Opt_max_credits,
103 Opt_snapshot,
104
105 /* Mount options which take string value */
106 Opt_user, Opt_pass, Opt_ip,
107 Opt_domain, Opt_srcaddr, Opt_iocharset,
108 Opt_netbiosname, Opt_servern,
109 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
110
111 /* Mount options to be ignored */
112 Opt_ignore,
113
114 /* Options which could be blank */
115 Opt_blank_pass,
116 Opt_blank_user,
117 Opt_blank_ip,
118
119 Opt_err
120};
121
122static const match_table_t cifs_mount_option_tokens = {
123
124 { Opt_user_xattr, "user_xattr" },
125 { Opt_nouser_xattr, "nouser_xattr" },
126 { Opt_forceuid, "forceuid" },
127 { Opt_noforceuid, "noforceuid" },
128 { Opt_forcegid, "forcegid" },
129 { Opt_noforcegid, "noforcegid" },
130 { Opt_noblocksend, "noblocksend" },
131 { Opt_noautotune, "noautotune" },
132 { Opt_hard, "hard" },
133 { Opt_soft, "soft" },
134 { Opt_perm, "perm" },
135 { Opt_noperm, "noperm" },
136 { Opt_mapchars, "mapchars" }, /* SFU style */
137 { Opt_nomapchars, "nomapchars" },
138 { Opt_mapposix, "mapposix" }, /* SFM style */
139 { Opt_nomapposix, "nomapposix" },
140 { Opt_sfu, "sfu" },
141 { Opt_nosfu, "nosfu" },
142 { Opt_nodfs, "nodfs" },
143 { Opt_posixpaths, "posixpaths" },
144 { Opt_noposixpaths, "noposixpaths" },
145 { Opt_nounix, "nounix" },
146 { Opt_nounix, "nolinux" },
147 { Opt_nocase, "nocase" },
148 { Opt_nocase, "ignorecase" },
149 { Opt_brl, "brl" },
150 { Opt_nobrl, "nobrl" },
151 { Opt_nobrl, "nolock" },
152 { Opt_forcemandatorylock, "forcemandatorylock" },
153 { Opt_forcemandatorylock, "forcemand" },
154 { Opt_setuids, "setuids" },
155 { Opt_nosetuids, "nosetuids" },
156 { Opt_setuidfromacl, "idsfromsid" },
157 { Opt_dynperm, "dynperm" },
158 { Opt_nodynperm, "nodynperm" },
159 { Opt_nohard, "nohard" },
160 { Opt_nosoft, "nosoft" },
161 { Opt_nointr, "nointr" },
162 { Opt_intr, "intr" },
163 { Opt_nostrictsync, "nostrictsync" },
164 { Opt_strictsync, "strictsync" },
165 { Opt_serverino, "serverino" },
166 { Opt_noserverino, "noserverino" },
167 { Opt_rwpidforward, "rwpidforward" },
168 { Opt_cifsacl, "cifsacl" },
169 { Opt_nocifsacl, "nocifsacl" },
170 { Opt_acl, "acl" },
171 { Opt_noacl, "noacl" },
172 { Opt_locallease, "locallease" },
173 { Opt_sign, "sign" },
174 { Opt_seal, "seal" },
175 { Opt_noac, "noac" },
176 { Opt_fsc, "fsc" },
177 { Opt_mfsymlinks, "mfsymlinks" },
178 { Opt_multiuser, "multiuser" },
179 { Opt_sloppy, "sloppy" },
180 { Opt_nosharesock, "nosharesock" },
181 { Opt_persistent, "persistenthandles"},
182 { Opt_nopersistent, "nopersistenthandles"},
183 { Opt_resilient, "resilienthandles"},
184 { Opt_noresilient, "noresilienthandles"},
185 { Opt_domainauto, "domainauto"},
186
187 { Opt_backupuid, "backupuid=%s" },
188 { Opt_backupgid, "backupgid=%s" },
189 { Opt_uid, "uid=%s" },
190 { Opt_cruid, "cruid=%s" },
191 { Opt_gid, "gid=%s" },
192 { Opt_file_mode, "file_mode=%s" },
193 { Opt_dirmode, "dirmode=%s" },
194 { Opt_dirmode, "dir_mode=%s" },
195 { Opt_port, "port=%s" },
196 { Opt_rsize, "rsize=%s" },
197 { Opt_wsize, "wsize=%s" },
198 { Opt_actimeo, "actimeo=%s" },
199 { Opt_echo_interval, "echo_interval=%s" },
200 { Opt_max_credits, "max_credits=%s" },
201 { Opt_snapshot, "snapshot=%s" },
202
203 { Opt_blank_user, "user=" },
204 { Opt_blank_user, "username=" },
205 { Opt_user, "user=%s" },
206 { Opt_user, "username=%s" },
207 { Opt_blank_pass, "pass=" },
208 { Opt_blank_pass, "password=" },
209 { Opt_pass, "pass=%s" },
210 { Opt_pass, "password=%s" },
211 { Opt_blank_ip, "ip=" },
212 { Opt_blank_ip, "addr=" },
213 { Opt_ip, "ip=%s" },
214 { Opt_ip, "addr=%s" },
215 { Opt_ignore, "unc=%s" },
216 { Opt_ignore, "target=%s" },
217 { Opt_ignore, "path=%s" },
218 { Opt_domain, "dom=%s" },
219 { Opt_domain, "domain=%s" },
220 { Opt_domain, "workgroup=%s" },
221 { Opt_srcaddr, "srcaddr=%s" },
222 { Opt_ignore, "prefixpath=%s" },
223 { Opt_iocharset, "iocharset=%s" },
224 { Opt_netbiosname, "netbiosname=%s" },
225 { Opt_servern, "servern=%s" },
226 { Opt_ver, "ver=%s" },
227 { Opt_vers, "vers=%s" },
228 { Opt_sec, "sec=%s" },
229 { Opt_cache, "cache=%s" },
230
231 { Opt_ignore, "cred" },
232 { Opt_ignore, "credentials" },
233 { Opt_ignore, "cred=%s" },
234 { Opt_ignore, "credentials=%s" },
235 { Opt_ignore, "guest" },
236 { Opt_ignore, "rw" },
237 { Opt_ignore, "ro" },
238 { Opt_ignore, "suid" },
239 { Opt_ignore, "nosuid" },
240 { Opt_ignore, "exec" },
241 { Opt_ignore, "noexec" },
242 { Opt_ignore, "nodev" },
243 { Opt_ignore, "noauto" },
244 { Opt_ignore, "dev" },
245 { Opt_ignore, "mand" },
246 { Opt_ignore, "nomand" },
247 { Opt_ignore, "_netdev" },
248
249 { Opt_err, NULL }
250};
251
252enum {
253 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
254 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
255 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
256 Opt_sec_ntlmv2i, Opt_sec_lanman,
257 Opt_sec_none,
258
259 Opt_sec_err
260};
261
262static const match_table_t cifs_secflavor_tokens = {
263 { Opt_sec_krb5, "krb5" },
264 { Opt_sec_krb5i, "krb5i" },
265 { Opt_sec_krb5p, "krb5p" },
266 { Opt_sec_ntlmsspi, "ntlmsspi" },
267 { Opt_sec_ntlmssp, "ntlmssp" },
268 { Opt_ntlm, "ntlm" },
269 { Opt_sec_ntlmi, "ntlmi" },
270 { Opt_sec_ntlmv2, "nontlm" },
271 { Opt_sec_ntlmv2, "ntlmv2" },
272 { Opt_sec_ntlmv2i, "ntlmv2i" },
273 { Opt_sec_lanman, "lanman" },
274 { Opt_sec_none, "none" },
275
276 { Opt_sec_err, NULL }
277};
278
279/* cache flavors */
280enum {
281 Opt_cache_loose,
282 Opt_cache_strict,
283 Opt_cache_none,
284 Opt_cache_err
285};
286
287static const match_table_t cifs_cacheflavor_tokens = {
288 { Opt_cache_loose, "loose" },
289 { Opt_cache_strict, "strict" },
290 { Opt_cache_none, "none" },
291 { Opt_cache_err, NULL }
292};
293
294static const match_table_t cifs_smb_version_tokens = {
295 { Smb_1, SMB1_VERSION_STRING },
296 { Smb_20, SMB20_VERSION_STRING},
297 { Smb_21, SMB21_VERSION_STRING },
298 { Smb_30, SMB30_VERSION_STRING },
299 { Smb_302, SMB302_VERSION_STRING },
300#ifdef CONFIG_CIFS_SMB311
301 { Smb_311, SMB311_VERSION_STRING },
302 { Smb_311, ALT_SMB311_VERSION_STRING },
303#endif /* SMB311 */
304 { Smb_version_err, NULL }
305};
306
307static int ip_connect(struct TCP_Server_Info *server);
308static int generic_ip_connect(struct TCP_Server_Info *server);
309static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
310static void cifs_prune_tlinks(struct work_struct *work);
311static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
312 const char *devname);
313
314/*
315 * cifs tcp session reconnection
316 *
317 * mark tcp session as reconnecting so temporarily locked
318 * mark all smb sessions as reconnecting for tcp session
319 * reconnect tcp session
320 * wake up waiters on reconnection? - (not needed currently)
321 */
322int
323cifs_reconnect(struct TCP_Server_Info *server)
324{
325 int rc = 0;
326 struct list_head *tmp, *tmp2;
327 struct cifs_ses *ses;
328 struct cifs_tcon *tcon;
329 struct mid_q_entry *mid_entry;
330 struct list_head retry_list;
331
332 spin_lock(&GlobalMid_Lock);
333 if (server->tcpStatus == CifsExiting) {
334 /* the demux thread will exit normally
335 next time through the loop */
336 spin_unlock(&GlobalMid_Lock);
337 return rc;
338 } else
339 server->tcpStatus = CifsNeedReconnect;
340 spin_unlock(&GlobalMid_Lock);
341 server->maxBuf = 0;
342#ifdef CONFIG_CIFS_SMB2
343 server->max_read = 0;
344#endif
345
346 cifs_dbg(FYI, "Reconnecting tcp session\n");
347
348 /* before reconnecting the tcp session, mark the smb session (uid)
349 and the tid bad so they are not used until reconnected */
350 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
351 __func__);
352 spin_lock(&cifs_tcp_ses_lock);
353 list_for_each(tmp, &server->smb_ses_list) {
354 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
355 ses->need_reconnect = true;
356 ses->ipc_tid = 0;
357 list_for_each(tmp2, &ses->tcon_list) {
358 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
359 tcon->need_reconnect = true;
360 }
361 }
362 spin_unlock(&cifs_tcp_ses_lock);
363
364 /* do not want to be sending data on a socket we are freeing */
365 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
366 mutex_lock(&server->srv_mutex);
367 if (server->ssocket) {
368 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
369 server->ssocket->state, server->ssocket->flags);
370 kernel_sock_shutdown(server->ssocket, SHUT_WR);
371 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
372 server->ssocket->state, server->ssocket->flags);
373 sock_release(server->ssocket);
374 server->ssocket = NULL;
375 }
376 server->sequence_number = 0;
377 server->session_estab = false;
378 kfree(server->session_key.response);
379 server->session_key.response = NULL;
380 server->session_key.len = 0;
381 server->lstrp = jiffies;
382
383 /* mark submitted MIDs for retry and issue callback */
384 INIT_LIST_HEAD(&retry_list);
385 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
386 spin_lock(&GlobalMid_Lock);
387 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
388 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
389 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
390 mid_entry->mid_state = MID_RETRY_NEEDED;
391 list_move(&mid_entry->qhead, &retry_list);
392 }
393 spin_unlock(&GlobalMid_Lock);
394 mutex_unlock(&server->srv_mutex);
395
396 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
397 list_for_each_safe(tmp, tmp2, &retry_list) {
398 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
399 list_del_init(&mid_entry->qhead);
400 mid_entry->callback(mid_entry);
401 }
402
403 do {
404 try_to_freeze();
405
406 /* we should try only the port we connected to before */
407 mutex_lock(&server->srv_mutex);
408 rc = generic_ip_connect(server);
409 if (rc) {
410 cifs_dbg(FYI, "reconnect error %d\n", rc);
411 mutex_unlock(&server->srv_mutex);
412 msleep(3000);
413 } else {
414 atomic_inc(&tcpSesReconnectCount);
415 spin_lock(&GlobalMid_Lock);
416 if (server->tcpStatus != CifsExiting)
417 server->tcpStatus = CifsNeedNegotiate;
418 spin_unlock(&GlobalMid_Lock);
419 mutex_unlock(&server->srv_mutex);
420 }
421 } while (server->tcpStatus == CifsNeedReconnect);
422
423 if (server->tcpStatus == CifsNeedNegotiate)
424 mod_delayed_work(cifsiod_wq, &server->echo, 0);
425
426 return rc;
427}
428
429static void
430cifs_echo_request(struct work_struct *work)
431{
432 int rc;
433 struct TCP_Server_Info *server = container_of(work,
434 struct TCP_Server_Info, echo.work);
435 unsigned long echo_interval;
436
437 /*
438 * If we need to renegotiate, set echo interval to zero to
439 * immediately call echo service where we can renegotiate.
440 */
441 if (server->tcpStatus == CifsNeedNegotiate)
442 echo_interval = 0;
443 else
444 echo_interval = server->echo_interval;
445
446 /*
447 * We cannot send an echo if it is disabled.
448 * Also, no need to ping if we got a response recently.
449 */
450
451 if (server->tcpStatus == CifsNeedReconnect ||
452 server->tcpStatus == CifsExiting ||
453 server->tcpStatus == CifsNew ||
454 (server->ops->can_echo && !server->ops->can_echo(server)) ||
455 time_before(jiffies, server->lstrp + echo_interval - HZ))
456 goto requeue_echo;
457
458 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
459 if (rc)
460 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
461 server->hostname);
462
463requeue_echo:
464 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
465}
466
467static bool
468allocate_buffers(struct TCP_Server_Info *server)
469{
470 if (!server->bigbuf) {
471 server->bigbuf = (char *)cifs_buf_get();
472 if (!server->bigbuf) {
473 cifs_dbg(VFS, "No memory for large SMB response\n");
474 msleep(3000);
475 /* retry will check if exiting */
476 return false;
477 }
478 } else if (server->large_buf) {
479 /* we are reusing a dirty large buf, clear its start */
480 memset(server->bigbuf, 0, HEADER_SIZE(server));
481 }
482
483 if (!server->smallbuf) {
484 server->smallbuf = (char *)cifs_small_buf_get();
485 if (!server->smallbuf) {
486 cifs_dbg(VFS, "No memory for SMB response\n");
487 msleep(1000);
488 /* retry will check if exiting */
489 return false;
490 }
491 /* beginning of smb buffer is cleared in our buf_get */
492 } else {
493 /* if existing small buf clear beginning */
494 memset(server->smallbuf, 0, HEADER_SIZE(server));
495 }
496
497 return true;
498}
499
500static bool
501server_unresponsive(struct TCP_Server_Info *server)
502{
503 /*
504 * We need to wait 2 echo intervals to make sure we handle such
505 * situations right:
506 * 1s client sends a normal SMB request
507 * 2s client gets a response
508 * 30s echo workqueue job pops, and decides we got a response recently
509 * and don't need to send another
510 * ...
511 * 65s kernel_recvmsg times out, and we see that we haven't gotten
512 * a response in >60s.
513 */
514 if (server->tcpStatus == CifsGood &&
515 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
516 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
517 server->hostname, (2 * server->echo_interval) / HZ);
518 cifs_reconnect(server);
519 wake_up(&server->response_q);
520 return true;
521 }
522
523 return false;
524}
525
526static int
527cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
528{
529 int length = 0;
530 int total_read;
531
532 smb_msg->msg_control = NULL;
533 smb_msg->msg_controllen = 0;
534
535 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
536 try_to_freeze();
537
538 if (server_unresponsive(server))
539 return -ECONNABORTED;
540
541 length = sock_recvmsg(server->ssocket, smb_msg, 0);
542
543 if (server->tcpStatus == CifsExiting)
544 return -ESHUTDOWN;
545
546 if (server->tcpStatus == CifsNeedReconnect) {
547 cifs_reconnect(server);
548 return -ECONNABORTED;
549 }
550
551 if (length == -ERESTARTSYS ||
552 length == -EAGAIN ||
553 length == -EINTR) {
554 /*
555 * Minimum sleep to prevent looping, allowing socket
556 * to clear and app threads to set tcpStatus
557 * CifsNeedReconnect if server hung.
558 */
559 usleep_range(1000, 2000);
560 length = 0;
561 continue;
562 }
563
564 if (length <= 0) {
565 cifs_dbg(FYI, "Received no data or error: %d\n", length);
566 cifs_reconnect(server);
567 return -ECONNABORTED;
568 }
569 }
570 return total_read;
571}
572
573int
574cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
575 unsigned int to_read)
576{
577 struct msghdr smb_msg;
578 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
579 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
580
581 return cifs_readv_from_socket(server, &smb_msg);
582}
583
584int
585cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
586 unsigned int to_read)
587{
588 struct msghdr smb_msg;
589 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
590 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
591 return cifs_readv_from_socket(server, &smb_msg);
592}
593
594static bool
595is_smb_response(struct TCP_Server_Info *server, unsigned char type)
596{
597 /*
598 * The first byte big endian of the length field,
599 * is actually not part of the length but the type
600 * with the most common, zero, as regular data.
601 */
602 switch (type) {
603 case RFC1002_SESSION_MESSAGE:
604 /* Regular SMB response */
605 return true;
606 case RFC1002_SESSION_KEEP_ALIVE:
607 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
608 break;
609 case RFC1002_POSITIVE_SESSION_RESPONSE:
610 cifs_dbg(FYI, "RFC 1002 positive session response\n");
611 break;
612 case RFC1002_NEGATIVE_SESSION_RESPONSE:
613 /*
614 * We get this from Windows 98 instead of an error on
615 * SMB negprot response.
616 */
617 cifs_dbg(FYI, "RFC 1002 negative session response\n");
618 /* give server a second to clean up */
619 msleep(1000);
620 /*
621 * Always try 445 first on reconnect since we get NACK
622 * on some if we ever connected to port 139 (the NACK
623 * is since we do not begin with RFC1001 session
624 * initialize frame).
625 */
626 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
627 cifs_reconnect(server);
628 wake_up(&server->response_q);
629 break;
630 default:
631 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
632 cifs_reconnect(server);
633 }
634
635 return false;
636}
637
638void
639dequeue_mid(struct mid_q_entry *mid, bool malformed)
640{
641#ifdef CONFIG_CIFS_STATS2
642 mid->when_received = jiffies;
643#endif
644 spin_lock(&GlobalMid_Lock);
645 if (!malformed)
646 mid->mid_state = MID_RESPONSE_RECEIVED;
647 else
648 mid->mid_state = MID_RESPONSE_MALFORMED;
649 list_del_init(&mid->qhead);
650 spin_unlock(&GlobalMid_Lock);
651}
652
653static void
654handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
655 char *buf, int malformed)
656{
657 if (server->ops->check_trans2 &&
658 server->ops->check_trans2(mid, server, buf, malformed))
659 return;
660 mid->resp_buf = buf;
661 mid->large_buf = server->large_buf;
662 /* Was previous buf put in mpx struct for multi-rsp? */
663 if (!mid->multiRsp) {
664 /* smb buffer will be freed by user thread */
665 if (server->large_buf)
666 server->bigbuf = NULL;
667 else
668 server->smallbuf = NULL;
669 }
670 dequeue_mid(mid, malformed);
671}
672
673static void clean_demultiplex_info(struct TCP_Server_Info *server)
674{
675 int length;
676
677 /* take it off the list, if it's not already */
678 spin_lock(&cifs_tcp_ses_lock);
679 list_del_init(&server->tcp_ses_list);
680 spin_unlock(&cifs_tcp_ses_lock);
681
682 spin_lock(&GlobalMid_Lock);
683 server->tcpStatus = CifsExiting;
684 spin_unlock(&GlobalMid_Lock);
685 wake_up_all(&server->response_q);
686
687 /* check if we have blocked requests that need to free */
688 spin_lock(&server->req_lock);
689 if (server->credits <= 0)
690 server->credits = 1;
691 spin_unlock(&server->req_lock);
692 /*
693 * Although there should not be any requests blocked on this queue it
694 * can not hurt to be paranoid and try to wake up requests that may
695 * haven been blocked when more than 50 at time were on the wire to the
696 * same server - they now will see the session is in exit state and get
697 * out of SendReceive.
698 */
699 wake_up_all(&server->request_q);
700 /* give those requests time to exit */
701 msleep(125);
702
703 if (server->ssocket) {
704 sock_release(server->ssocket);
705 server->ssocket = NULL;
706 }
707
708 if (!list_empty(&server->pending_mid_q)) {
709 struct list_head dispose_list;
710 struct mid_q_entry *mid_entry;
711 struct list_head *tmp, *tmp2;
712
713 INIT_LIST_HEAD(&dispose_list);
714 spin_lock(&GlobalMid_Lock);
715 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
716 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
717 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
718 mid_entry->mid_state = MID_SHUTDOWN;
719 list_move(&mid_entry->qhead, &dispose_list);
720 }
721 spin_unlock(&GlobalMid_Lock);
722
723 /* now walk dispose list and issue callbacks */
724 list_for_each_safe(tmp, tmp2, &dispose_list) {
725 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
726 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
727 list_del_init(&mid_entry->qhead);
728 mid_entry->callback(mid_entry);
729 }
730 /* 1/8th of sec is more than enough time for them to exit */
731 msleep(125);
732 }
733
734 if (!list_empty(&server->pending_mid_q)) {
735 /*
736 * mpx threads have not exited yet give them at least the smb
737 * send timeout time for long ops.
738 *
739 * Due to delays on oplock break requests, we need to wait at
740 * least 45 seconds before giving up on a request getting a
741 * response and going ahead and killing cifsd.
742 */
743 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
744 msleep(46000);
745 /*
746 * If threads still have not exited they are probably never
747 * coming home not much else we can do but free the memory.
748 */
749 }
750
751 kfree(server->hostname);
752 kfree(server);
753
754 length = atomic_dec_return(&tcpSesAllocCount);
755 if (length > 0)
756 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
757}
758
759static int
760standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
761{
762 int length;
763 char *buf = server->smallbuf;
764 unsigned int pdu_length = get_rfc1002_length(buf);
765
766 /* make sure this will fit in a large buffer */
767 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
768 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
769 cifs_reconnect(server);
770 wake_up(&server->response_q);
771 return -ECONNABORTED;
772 }
773
774 /* switch to large buffer if too big for a small one */
775 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
776 server->large_buf = true;
777 memcpy(server->bigbuf, buf, server->total_read);
778 buf = server->bigbuf;
779 }
780
781 /* now read the rest */
782 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
783 pdu_length - HEADER_SIZE(server) + 1 + 4);
784 if (length < 0)
785 return length;
786 server->total_read += length;
787
788 dump_smb(buf, server->total_read);
789
790 /*
791 * We know that we received enough to get to the MID as we
792 * checked the pdu_length earlier. Now check to see
793 * if the rest of the header is OK. We borrow the length
794 * var for the rest of the loop to avoid a new stack var.
795 *
796 * 48 bytes is enough to display the header and a little bit
797 * into the payload for debugging purposes.
798 */
799 length = server->ops->check_message(buf, server->total_read, server);
800 if (length != 0)
801 cifs_dump_mem("Bad SMB: ", buf,
802 min_t(unsigned int, server->total_read, 48));
803
804 if (server->ops->is_status_pending &&
805 server->ops->is_status_pending(buf, server, length))
806 return -1;
807
808 if (!mid)
809 return length;
810
811 handle_mid(mid, server, buf, length);
812 return 0;
813}
814
815static int
816cifs_demultiplex_thread(void *p)
817{
818 int length;
819 struct TCP_Server_Info *server = p;
820 unsigned int pdu_length;
821 char *buf = NULL;
822 struct task_struct *task_to_wake = NULL;
823 struct mid_q_entry *mid_entry;
824
825 current->flags |= PF_MEMALLOC;
826 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
827
828 length = atomic_inc_return(&tcpSesAllocCount);
829 if (length > 1)
830 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
831
832 set_freezable();
833 while (server->tcpStatus != CifsExiting) {
834 if (try_to_freeze())
835 continue;
836
837 if (!allocate_buffers(server))
838 continue;
839
840 server->large_buf = false;
841 buf = server->smallbuf;
842 pdu_length = 4; /* enough to get RFC1001 header */
843
844 length = cifs_read_from_socket(server, buf, pdu_length);
845 if (length < 0)
846 continue;
847 server->total_read = length;
848
849 /*
850 * The right amount was read from socket - 4 bytes,
851 * so we can now interpret the length field.
852 */
853 pdu_length = get_rfc1002_length(buf);
854
855 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
856 if (!is_smb_response(server, buf[0]))
857 continue;
858
859 /* make sure we have enough to get to the MID */
860 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
861 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
862 pdu_length);
863 cifs_reconnect(server);
864 wake_up(&server->response_q);
865 continue;
866 }
867
868 /* read down to the MID */
869 length = cifs_read_from_socket(server, buf + 4,
870 HEADER_SIZE(server) - 1 - 4);
871 if (length < 0)
872 continue;
873 server->total_read += length;
874
875 mid_entry = server->ops->find_mid(server, buf);
876
877 if (!mid_entry || !mid_entry->receive)
878 length = standard_receive3(server, mid_entry);
879 else
880 length = mid_entry->receive(server, mid_entry);
881
882 if (length < 0)
883 continue;
884
885 if (server->large_buf)
886 buf = server->bigbuf;
887
888 server->lstrp = jiffies;
889 if (mid_entry != NULL) {
890 if (!mid_entry->multiRsp || mid_entry->multiEnd)
891 mid_entry->callback(mid_entry);
892 } else if (!server->ops->is_oplock_break ||
893 !server->ops->is_oplock_break(buf, server)) {
894 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
895 atomic_read(&midCount));
896 cifs_dump_mem("Received Data is: ", buf,
897 HEADER_SIZE(server));
898#ifdef CONFIG_CIFS_DEBUG2
899 if (server->ops->dump_detail)
900 server->ops->dump_detail(buf);
901 cifs_dump_mids(server);
902#endif /* CIFS_DEBUG2 */
903
904 }
905 } /* end while !EXITING */
906
907 /* buffer usually freed in free_mid - need to free it here on exit */
908 cifs_buf_release(server->bigbuf);
909 if (server->smallbuf) /* no sense logging a debug message if NULL */
910 cifs_small_buf_release(server->smallbuf);
911
912 task_to_wake = xchg(&server->tsk, NULL);
913 clean_demultiplex_info(server);
914
915 /* if server->tsk was NULL then wait for a signal before exiting */
916 if (!task_to_wake) {
917 set_current_state(TASK_INTERRUPTIBLE);
918 while (!signal_pending(current)) {
919 schedule();
920 set_current_state(TASK_INTERRUPTIBLE);
921 }
922 set_current_state(TASK_RUNNING);
923 }
924
925 module_put_and_exit(0);
926}
927
928/* extract the host portion of the UNC string */
929static char *
930extract_hostname(const char *unc)
931{
932 const char *src;
933 char *dst, *delim;
934 unsigned int len;
935
936 /* skip double chars at beginning of string */
937 /* BB: check validity of these bytes? */
938 src = unc + 2;
939
940 /* delimiter between hostname and sharename is always '\\' now */
941 delim = strchr(src, '\\');
942 if (!delim)
943 return ERR_PTR(-EINVAL);
944
945 len = delim - src;
946 dst = kmalloc((len + 1), GFP_KERNEL);
947 if (dst == NULL)
948 return ERR_PTR(-ENOMEM);
949
950 memcpy(dst, src, len);
951 dst[len] = '\0';
952
953 return dst;
954}
955
956static int get_option_ul(substring_t args[], unsigned long *option)
957{
958 int rc;
959 char *string;
960
961 string = match_strdup(args);
962 if (string == NULL)
963 return -ENOMEM;
964 rc = kstrtoul(string, 0, option);
965 kfree(string);
966
967 return rc;
968}
969
970static int get_option_uid(substring_t args[], kuid_t *result)
971{
972 unsigned long value;
973 kuid_t uid;
974 int rc;
975
976 rc = get_option_ul(args, &value);
977 if (rc)
978 return rc;
979
980 uid = make_kuid(current_user_ns(), value);
981 if (!uid_valid(uid))
982 return -EINVAL;
983
984 *result = uid;
985 return 0;
986}
987
988static int get_option_gid(substring_t args[], kgid_t *result)
989{
990 unsigned long value;
991 kgid_t gid;
992 int rc;
993
994 rc = get_option_ul(args, &value);
995 if (rc)
996 return rc;
997
998 gid = make_kgid(current_user_ns(), value);
999 if (!gid_valid(gid))
1000 return -EINVAL;
1001
1002 *result = gid;
1003 return 0;
1004}
1005
1006static int cifs_parse_security_flavors(char *value,
1007 struct smb_vol *vol)
1008{
1009
1010 substring_t args[MAX_OPT_ARGS];
1011
1012 /*
1013 * With mount options, the last one should win. Reset any existing
1014 * settings back to default.
1015 */
1016 vol->sectype = Unspecified;
1017 vol->sign = false;
1018
1019 switch (match_token(value, cifs_secflavor_tokens, args)) {
1020 case Opt_sec_krb5p:
1021 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1022 return 1;
1023 case Opt_sec_krb5i:
1024 vol->sign = true;
1025 /* Fallthrough */
1026 case Opt_sec_krb5:
1027 vol->sectype = Kerberos;
1028 break;
1029 case Opt_sec_ntlmsspi:
1030 vol->sign = true;
1031 /* Fallthrough */
1032 case Opt_sec_ntlmssp:
1033 vol->sectype = RawNTLMSSP;
1034 break;
1035 case Opt_sec_ntlmi:
1036 vol->sign = true;
1037 /* Fallthrough */
1038 case Opt_ntlm:
1039 vol->sectype = NTLM;
1040 break;
1041 case Opt_sec_ntlmv2i:
1042 vol->sign = true;
1043 /* Fallthrough */
1044 case Opt_sec_ntlmv2:
1045 vol->sectype = NTLMv2;
1046 break;
1047#ifdef CONFIG_CIFS_WEAK_PW_HASH
1048 case Opt_sec_lanman:
1049 vol->sectype = LANMAN;
1050 break;
1051#endif
1052 case Opt_sec_none:
1053 vol->nullauth = 1;
1054 break;
1055 default:
1056 cifs_dbg(VFS, "bad security option: %s\n", value);
1057 return 1;
1058 }
1059
1060 return 0;
1061}
1062
1063static int
1064cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1065{
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1069 case Opt_cache_loose:
1070 vol->direct_io = false;
1071 vol->strict_io = false;
1072 break;
1073 case Opt_cache_strict:
1074 vol->direct_io = false;
1075 vol->strict_io = true;
1076 break;
1077 case Opt_cache_none:
1078 vol->direct_io = true;
1079 vol->strict_io = false;
1080 break;
1081 default:
1082 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1083 return 1;
1084 }
1085 return 0;
1086}
1087
1088static int
1089cifs_parse_smb_version(char *value, struct smb_vol *vol)
1090{
1091 substring_t args[MAX_OPT_ARGS];
1092
1093 switch (match_token(value, cifs_smb_version_tokens, args)) {
1094 case Smb_1:
1095 vol->ops = &smb1_operations;
1096 vol->vals = &smb1_values;
1097 break;
1098#ifdef CONFIG_CIFS_SMB2
1099 case Smb_20:
1100 vol->ops = &smb20_operations;
1101 vol->vals = &smb20_values;
1102 break;
1103 case Smb_21:
1104 vol->ops = &smb21_operations;
1105 vol->vals = &smb21_values;
1106 break;
1107 case Smb_30:
1108 vol->ops = &smb30_operations;
1109 vol->vals = &smb30_values;
1110 break;
1111 case Smb_302:
1112 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1113 vol->vals = &smb302_values;
1114 break;
1115#ifdef CONFIG_CIFS_SMB311
1116 case Smb_311:
1117 vol->ops = &smb311_operations;
1118 vol->vals = &smb311_values;
1119 break;
1120#endif /* SMB311 */
1121#endif
1122 default:
1123 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1124 return 1;
1125 }
1126 return 0;
1127}
1128
1129/*
1130 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1131 * fields with the result. Returns 0 on success and an error otherwise.
1132 */
1133static int
1134cifs_parse_devname(const char *devname, struct smb_vol *vol)
1135{
1136 char *pos;
1137 const char *delims = "/\\";
1138 size_t len;
1139
1140 /* make sure we have a valid UNC double delimiter prefix */
1141 len = strspn(devname, delims);
1142 if (len != 2)
1143 return -EINVAL;
1144
1145 /* find delimiter between host and sharename */
1146 pos = strpbrk(devname + 2, delims);
1147 if (!pos)
1148 return -EINVAL;
1149
1150 /* skip past delimiter */
1151 ++pos;
1152
1153 /* now go until next delimiter or end of string */
1154 len = strcspn(pos, delims);
1155
1156 /* move "pos" up to delimiter or NULL */
1157 pos += len;
1158 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1159 if (!vol->UNC)
1160 return -ENOMEM;
1161
1162 convert_delimiter(vol->UNC, '\\');
1163
1164 /* skip any delimiter */
1165 if (*pos == '/' || *pos == '\\')
1166 pos++;
1167
1168 /* If pos is NULL then no prepath */
1169 if (!*pos)
1170 return 0;
1171
1172 vol->prepath = kstrdup(pos, GFP_KERNEL);
1173 if (!vol->prepath)
1174 return -ENOMEM;
1175
1176 return 0;
1177}
1178
1179static int
1180cifs_parse_mount_options(const char *mountdata, const char *devname,
1181 struct smb_vol *vol)
1182{
1183 char *data, *end;
1184 char *mountdata_copy = NULL, *options;
1185 unsigned int temp_len, i, j;
1186 char separator[2];
1187 short int override_uid = -1;
1188 short int override_gid = -1;
1189 bool uid_specified = false;
1190 bool gid_specified = false;
1191 bool sloppy = false;
1192 char *invalid = NULL;
1193 char *nodename = utsname()->nodename;
1194 char *string = NULL;
1195 char *tmp_end, *value;
1196 char delim;
1197 bool got_ip = false;
1198 unsigned short port = 0;
1199 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1200
1201 separator[0] = ',';
1202 separator[1] = 0;
1203 delim = separator[0];
1204
1205 /* ensure we always start with zeroed-out smb_vol */
1206 memset(vol, 0, sizeof(*vol));
1207
1208 /*
1209 * does not have to be perfect mapping since field is
1210 * informational, only used for servers that do not support
1211 * port 445 and it can be overridden at mount time
1212 */
1213 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1214 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1215 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1216
1217 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1218 /* null target name indicates to use *SMBSERVR default called name
1219 if we end up sending RFC1001 session initialize */
1220 vol->target_rfc1001_name[0] = 0;
1221 vol->cred_uid = current_uid();
1222 vol->linux_uid = current_uid();
1223 vol->linux_gid = current_gid();
1224
1225 /*
1226 * default to SFM style remapping of seven reserved characters
1227 * unless user overrides it or we negotiate CIFS POSIX where
1228 * it is unnecessary. Can not simultaneously use more than one mapping
1229 * since then readdir could list files that open could not open
1230 */
1231 vol->remap = true;
1232
1233 /* default to only allowing write access to owner of the mount */
1234 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1235
1236 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1237 /* default is always to request posix paths. */
1238 vol->posix_paths = 1;
1239 /* default to using server inode numbers where available */
1240 vol->server_ino = 1;
1241
1242 /* default is to use strict cifs caching semantics */
1243 vol->strict_io = true;
1244
1245 vol->actimeo = CIFS_DEF_ACTIMEO;
1246
1247 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1248 vol->ops = &smb1_operations;
1249 vol->vals = &smb1_values;
1250
1251 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1252
1253 if (!mountdata)
1254 goto cifs_parse_mount_err;
1255
1256 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1257 if (!mountdata_copy)
1258 goto cifs_parse_mount_err;
1259
1260 options = mountdata_copy;
1261 end = options + strlen(options);
1262
1263 if (strncmp(options, "sep=", 4) == 0) {
1264 if (options[4] != 0) {
1265 separator[0] = options[4];
1266 options += 5;
1267 } else {
1268 cifs_dbg(FYI, "Null separator not allowed\n");
1269 }
1270 }
1271 vol->backupuid_specified = false; /* no backup intent for a user */
1272 vol->backupgid_specified = false; /* no backup intent for a group */
1273
1274 switch (cifs_parse_devname(devname, vol)) {
1275 case 0:
1276 break;
1277 case -ENOMEM:
1278 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1279 goto cifs_parse_mount_err;
1280 case -EINVAL:
1281 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1282 goto cifs_parse_mount_err;
1283 default:
1284 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1285 goto cifs_parse_mount_err;
1286 }
1287
1288 while ((data = strsep(&options, separator)) != NULL) {
1289 substring_t args[MAX_OPT_ARGS];
1290 unsigned long option;
1291 int token;
1292
1293 if (!*data)
1294 continue;
1295
1296 token = match_token(data, cifs_mount_option_tokens, args);
1297
1298 switch (token) {
1299
1300 /* Ingnore the following */
1301 case Opt_ignore:
1302 break;
1303
1304 /* Boolean values */
1305 case Opt_user_xattr:
1306 vol->no_xattr = 0;
1307 break;
1308 case Opt_nouser_xattr:
1309 vol->no_xattr = 1;
1310 break;
1311 case Opt_forceuid:
1312 override_uid = 1;
1313 break;
1314 case Opt_noforceuid:
1315 override_uid = 0;
1316 break;
1317 case Opt_forcegid:
1318 override_gid = 1;
1319 break;
1320 case Opt_noforcegid:
1321 override_gid = 0;
1322 break;
1323 case Opt_noblocksend:
1324 vol->noblocksnd = 1;
1325 break;
1326 case Opt_noautotune:
1327 vol->noautotune = 1;
1328 break;
1329 case Opt_hard:
1330 vol->retry = 1;
1331 break;
1332 case Opt_soft:
1333 vol->retry = 0;
1334 break;
1335 case Opt_perm:
1336 vol->noperm = 0;
1337 break;
1338 case Opt_noperm:
1339 vol->noperm = 1;
1340 break;
1341 case Opt_mapchars:
1342 vol->sfu_remap = true;
1343 vol->remap = false; /* disable SFM mapping */
1344 break;
1345 case Opt_nomapchars:
1346 vol->sfu_remap = false;
1347 break;
1348 case Opt_mapposix:
1349 vol->remap = true;
1350 vol->sfu_remap = false; /* disable SFU mapping */
1351 break;
1352 case Opt_nomapposix:
1353 vol->remap = false;
1354 break;
1355 case Opt_sfu:
1356 vol->sfu_emul = 1;
1357 break;
1358 case Opt_nosfu:
1359 vol->sfu_emul = 0;
1360 break;
1361 case Opt_nodfs:
1362 vol->nodfs = 1;
1363 break;
1364 case Opt_posixpaths:
1365 vol->posix_paths = 1;
1366 break;
1367 case Opt_noposixpaths:
1368 vol->posix_paths = 0;
1369 break;
1370 case Opt_nounix:
1371 vol->no_linux_ext = 1;
1372 break;
1373 case Opt_nocase:
1374 vol->nocase = 1;
1375 break;
1376 case Opt_brl:
1377 vol->nobrl = 0;
1378 break;
1379 case Opt_nobrl:
1380 vol->nobrl = 1;
1381 /*
1382 * turn off mandatory locking in mode
1383 * if remote locking is turned off since the
1384 * local vfs will do advisory
1385 */
1386 if (vol->file_mode ==
1387 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1388 vol->file_mode = S_IALLUGO;
1389 break;
1390 case Opt_forcemandatorylock:
1391 vol->mand_lock = 1;
1392 break;
1393 case Opt_setuids:
1394 vol->setuids = 1;
1395 break;
1396 case Opt_nosetuids:
1397 vol->setuids = 0;
1398 break;
1399 case Opt_setuidfromacl:
1400 vol->setuidfromacl = 1;
1401 break;
1402 case Opt_dynperm:
1403 vol->dynperm = true;
1404 break;
1405 case Opt_nodynperm:
1406 vol->dynperm = false;
1407 break;
1408 case Opt_nohard:
1409 vol->retry = 0;
1410 break;
1411 case Opt_nosoft:
1412 vol->retry = 1;
1413 break;
1414 case Opt_nointr:
1415 vol->intr = 0;
1416 break;
1417 case Opt_intr:
1418 vol->intr = 1;
1419 break;
1420 case Opt_nostrictsync:
1421 vol->nostrictsync = 1;
1422 break;
1423 case Opt_strictsync:
1424 vol->nostrictsync = 0;
1425 break;
1426 case Opt_serverino:
1427 vol->server_ino = 1;
1428 break;
1429 case Opt_noserverino:
1430 vol->server_ino = 0;
1431 break;
1432 case Opt_rwpidforward:
1433 vol->rwpidforward = 1;
1434 break;
1435 case Opt_cifsacl:
1436 vol->cifs_acl = 1;
1437 break;
1438 case Opt_nocifsacl:
1439 vol->cifs_acl = 0;
1440 break;
1441 case Opt_acl:
1442 vol->no_psx_acl = 0;
1443 break;
1444 case Opt_noacl:
1445 vol->no_psx_acl = 1;
1446 break;
1447 case Opt_locallease:
1448 vol->local_lease = 1;
1449 break;
1450 case Opt_sign:
1451 vol->sign = true;
1452 break;
1453 case Opt_seal:
1454 /* we do not do the following in secFlags because seal
1455 * is a per tree connection (mount) not a per socket
1456 * or per-smb connection option in the protocol
1457 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1458 */
1459 vol->seal = 1;
1460 break;
1461 case Opt_noac:
1462 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1463 break;
1464 case Opt_fsc:
1465#ifndef CONFIG_CIFS_FSCACHE
1466 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1467 goto cifs_parse_mount_err;
1468#endif
1469 vol->fsc = true;
1470 break;
1471 case Opt_mfsymlinks:
1472 vol->mfsymlinks = true;
1473 break;
1474 case Opt_multiuser:
1475 vol->multiuser = true;
1476 break;
1477 case Opt_sloppy:
1478 sloppy = true;
1479 break;
1480 case Opt_nosharesock:
1481 vol->nosharesock = true;
1482 break;
1483 case Opt_nopersistent:
1484 vol->nopersistent = true;
1485 if (vol->persistent) {
1486 cifs_dbg(VFS,
1487 "persistenthandles mount options conflict\n");
1488 goto cifs_parse_mount_err;
1489 }
1490 break;
1491 case Opt_persistent:
1492 vol->persistent = true;
1493 if ((vol->nopersistent) || (vol->resilient)) {
1494 cifs_dbg(VFS,
1495 "persistenthandles mount options conflict\n");
1496 goto cifs_parse_mount_err;
1497 }
1498 break;
1499 case Opt_resilient:
1500 vol->resilient = true;
1501 if (vol->persistent) {
1502 cifs_dbg(VFS,
1503 "persistenthandles mount options conflict\n");
1504 goto cifs_parse_mount_err;
1505 }
1506 break;
1507 case Opt_noresilient:
1508 vol->resilient = false; /* already the default */
1509 break;
1510 case Opt_domainauto:
1511 vol->domainauto = true;
1512 break;
1513
1514 /* Numeric Values */
1515 case Opt_backupuid:
1516 if (get_option_uid(args, &vol->backupuid)) {
1517 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1518 __func__);
1519 goto cifs_parse_mount_err;
1520 }
1521 vol->backupuid_specified = true;
1522 break;
1523 case Opt_backupgid:
1524 if (get_option_gid(args, &vol->backupgid)) {
1525 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1526 __func__);
1527 goto cifs_parse_mount_err;
1528 }
1529 vol->backupgid_specified = true;
1530 break;
1531 case Opt_uid:
1532 if (get_option_uid(args, &vol->linux_uid)) {
1533 cifs_dbg(VFS, "%s: Invalid uid value\n",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 uid_specified = true;
1538 break;
1539 case Opt_cruid:
1540 if (get_option_uid(args, &vol->cred_uid)) {
1541 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 break;
1546 case Opt_gid:
1547 if (get_option_gid(args, &vol->linux_gid)) {
1548 cifs_dbg(VFS, "%s: Invalid gid value\n",
1549 __func__);
1550 goto cifs_parse_mount_err;
1551 }
1552 gid_specified = true;
1553 break;
1554 case Opt_file_mode:
1555 if (get_option_ul(args, &option)) {
1556 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1557 __func__);
1558 goto cifs_parse_mount_err;
1559 }
1560 vol->file_mode = option;
1561 break;
1562 case Opt_dirmode:
1563 if (get_option_ul(args, &option)) {
1564 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1565 __func__);
1566 goto cifs_parse_mount_err;
1567 }
1568 vol->dir_mode = option;
1569 break;
1570 case Opt_port:
1571 if (get_option_ul(args, &option) ||
1572 option > USHRT_MAX) {
1573 cifs_dbg(VFS, "%s: Invalid port value\n",
1574 __func__);
1575 goto cifs_parse_mount_err;
1576 }
1577 port = (unsigned short)option;
1578 break;
1579 case Opt_rsize:
1580 if (get_option_ul(args, &option)) {
1581 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1582 __func__);
1583 goto cifs_parse_mount_err;
1584 }
1585 vol->rsize = option;
1586 break;
1587 case Opt_wsize:
1588 if (get_option_ul(args, &option)) {
1589 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1590 __func__);
1591 goto cifs_parse_mount_err;
1592 }
1593 vol->wsize = option;
1594 break;
1595 case Opt_actimeo:
1596 if (get_option_ul(args, &option)) {
1597 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1598 __func__);
1599 goto cifs_parse_mount_err;
1600 }
1601 vol->actimeo = HZ * option;
1602 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1603 cifs_dbg(VFS, "attribute cache timeout too large\n");
1604 goto cifs_parse_mount_err;
1605 }
1606 break;
1607 case Opt_echo_interval:
1608 if (get_option_ul(args, &option)) {
1609 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1610 __func__);
1611 goto cifs_parse_mount_err;
1612 }
1613 vol->echo_interval = option;
1614 break;
1615 case Opt_snapshot:
1616 if (get_option_ul(args, &option)) {
1617 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1618 __func__);
1619 goto cifs_parse_mount_err;
1620 }
1621 vol->snapshot_time = option;
1622 break;
1623 case Opt_max_credits:
1624 if (get_option_ul(args, &option) || (option < 20) ||
1625 (option > 60000)) {
1626 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1627 __func__);
1628 goto cifs_parse_mount_err;
1629 }
1630 vol->max_credits = option;
1631 break;
1632
1633 /* String Arguments */
1634
1635 case Opt_blank_user:
1636 /* null user, ie. anonymous authentication */
1637 vol->nullauth = 1;
1638 vol->username = NULL;
1639 break;
1640 case Opt_user:
1641 string = match_strdup(args);
1642 if (string == NULL)
1643 goto out_nomem;
1644
1645 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1646 CIFS_MAX_USERNAME_LEN) {
1647 pr_warn("CIFS: username too long\n");
1648 goto cifs_parse_mount_err;
1649 }
1650
1651 kfree(vol->username);
1652 vol->username = kstrdup(string, GFP_KERNEL);
1653 if (!vol->username)
1654 goto cifs_parse_mount_err;
1655 break;
1656 case Opt_blank_pass:
1657 /* passwords have to be handled differently
1658 * to allow the character used for deliminator
1659 * to be passed within them
1660 */
1661
1662 /*
1663 * Check if this is a case where the password
1664 * starts with a delimiter
1665 */
1666 tmp_end = strchr(data, '=');
1667 tmp_end++;
1668 if (!(tmp_end < end && tmp_end[1] == delim)) {
1669 /* No it is not. Set the password to NULL */
1670 kfree(vol->password);
1671 vol->password = NULL;
1672 break;
1673 }
1674 /* Yes it is. Drop down to Opt_pass below.*/
1675 case Opt_pass:
1676 /* Obtain the value string */
1677 value = strchr(data, '=');
1678 value++;
1679
1680 /* Set tmp_end to end of the string */
1681 tmp_end = (char *) value + strlen(value);
1682
1683 /* Check if following character is the deliminator
1684 * If yes, we have encountered a double deliminator
1685 * reset the NULL character to the deliminator
1686 */
1687 if (tmp_end < end && tmp_end[1] == delim) {
1688 tmp_end[0] = delim;
1689
1690 /* Keep iterating until we get to a single
1691 * deliminator OR the end
1692 */
1693 while ((tmp_end = strchr(tmp_end, delim))
1694 != NULL && (tmp_end[1] == delim)) {
1695 tmp_end = (char *) &tmp_end[2];
1696 }
1697
1698 /* Reset var options to point to next element */
1699 if (tmp_end) {
1700 tmp_end[0] = '\0';
1701 options = (char *) &tmp_end[1];
1702 } else
1703 /* Reached the end of the mount option
1704 * string */
1705 options = end;
1706 }
1707
1708 kfree(vol->password);
1709 /* Now build new password string */
1710 temp_len = strlen(value);
1711 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1712 if (vol->password == NULL) {
1713 pr_warn("CIFS: no memory for password\n");
1714 goto cifs_parse_mount_err;
1715 }
1716
1717 for (i = 0, j = 0; i < temp_len; i++, j++) {
1718 vol->password[j] = value[i];
1719 if ((value[i] == delim) &&
1720 value[i+1] == delim)
1721 /* skip the second deliminator */
1722 i++;
1723 }
1724 vol->password[j] = '\0';
1725 break;
1726 case Opt_blank_ip:
1727 /* FIXME: should this be an error instead? */
1728 got_ip = false;
1729 break;
1730 case Opt_ip:
1731 string = match_strdup(args);
1732 if (string == NULL)
1733 goto out_nomem;
1734
1735 if (!cifs_convert_address(dstaddr, string,
1736 strlen(string))) {
1737 pr_err("CIFS: bad ip= option (%s).\n", string);
1738 goto cifs_parse_mount_err;
1739 }
1740 got_ip = true;
1741 break;
1742 case Opt_domain:
1743 string = match_strdup(args);
1744 if (string == NULL)
1745 goto out_nomem;
1746
1747 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1748 == CIFS_MAX_DOMAINNAME_LEN) {
1749 pr_warn("CIFS: domain name too long\n");
1750 goto cifs_parse_mount_err;
1751 }
1752
1753 kfree(vol->domainname);
1754 vol->domainname = kstrdup(string, GFP_KERNEL);
1755 if (!vol->domainname) {
1756 pr_warn("CIFS: no memory for domainname\n");
1757 goto cifs_parse_mount_err;
1758 }
1759 cifs_dbg(FYI, "Domain name set\n");
1760 break;
1761 case Opt_srcaddr:
1762 string = match_strdup(args);
1763 if (string == NULL)
1764 goto out_nomem;
1765
1766 if (!cifs_convert_address(
1767 (struct sockaddr *)&vol->srcaddr,
1768 string, strlen(string))) {
1769 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1770 string);
1771 goto cifs_parse_mount_err;
1772 }
1773 break;
1774 case Opt_iocharset:
1775 string = match_strdup(args);
1776 if (string == NULL)
1777 goto out_nomem;
1778
1779 if (strnlen(string, 1024) >= 65) {
1780 pr_warn("CIFS: iocharset name too long.\n");
1781 goto cifs_parse_mount_err;
1782 }
1783
1784 if (strncasecmp(string, "default", 7) != 0) {
1785 kfree(vol->iocharset);
1786 vol->iocharset = kstrdup(string,
1787 GFP_KERNEL);
1788 if (!vol->iocharset) {
1789 pr_warn("CIFS: no memory for charset\n");
1790 goto cifs_parse_mount_err;
1791 }
1792 }
1793 /* if iocharset not set then load_nls_default
1794 * is used by caller
1795 */
1796 cifs_dbg(FYI, "iocharset set to %s\n", string);
1797 break;
1798 case Opt_netbiosname:
1799 string = match_strdup(args);
1800 if (string == NULL)
1801 goto out_nomem;
1802
1803 memset(vol->source_rfc1001_name, 0x20,
1804 RFC1001_NAME_LEN);
1805 /*
1806 * FIXME: are there cases in which a comma can
1807 * be valid in workstation netbios name (and
1808 * need special handling)?
1809 */
1810 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1811 /* don't ucase netbiosname for user */
1812 if (string[i] == 0)
1813 break;
1814 vol->source_rfc1001_name[i] = string[i];
1815 }
1816 /* The string has 16th byte zero still from
1817 * set at top of the function
1818 */
1819 if (i == RFC1001_NAME_LEN && string[i] != 0)
1820 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1821 break;
1822 case Opt_servern:
1823 /* servernetbiosname specified override *SMBSERVER */
1824 string = match_strdup(args);
1825 if (string == NULL)
1826 goto out_nomem;
1827
1828 /* last byte, type, is 0x20 for servr type */
1829 memset(vol->target_rfc1001_name, 0x20,
1830 RFC1001_NAME_LEN_WITH_NULL);
1831
1832 /* BB are there cases in which a comma can be
1833 valid in this workstation netbios name
1834 (and need special handling)? */
1835
1836 /* user or mount helper must uppercase the
1837 netbios name */
1838 for (i = 0; i < 15; i++) {
1839 if (string[i] == 0)
1840 break;
1841 vol->target_rfc1001_name[i] = string[i];
1842 }
1843 /* The string has 16th byte zero still from
1844 set at top of the function */
1845 if (i == RFC1001_NAME_LEN && string[i] != 0)
1846 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1847 break;
1848 case Opt_ver:
1849 string = match_strdup(args);
1850 if (string == NULL)
1851 goto out_nomem;
1852
1853 if (strncasecmp(string, "1", 1) == 0) {
1854 /* This is the default */
1855 break;
1856 }
1857 /* For all other value, error */
1858 pr_warn("CIFS: Invalid version specified\n");
1859 goto cifs_parse_mount_err;
1860 case Opt_vers:
1861 string = match_strdup(args);
1862 if (string == NULL)
1863 goto out_nomem;
1864
1865 if (cifs_parse_smb_version(string, vol) != 0)
1866 goto cifs_parse_mount_err;
1867 break;
1868 case Opt_sec:
1869 string = match_strdup(args);
1870 if (string == NULL)
1871 goto out_nomem;
1872
1873 if (cifs_parse_security_flavors(string, vol) != 0)
1874 goto cifs_parse_mount_err;
1875 break;
1876 case Opt_cache:
1877 string = match_strdup(args);
1878 if (string == NULL)
1879 goto out_nomem;
1880
1881 if (cifs_parse_cache_flavor(string, vol) != 0)
1882 goto cifs_parse_mount_err;
1883 break;
1884 default:
1885 /*
1886 * An option we don't recognize. Save it off for later
1887 * if we haven't already found one
1888 */
1889 if (!invalid)
1890 invalid = data;
1891 break;
1892 }
1893 /* Free up any allocated string */
1894 kfree(string);
1895 string = NULL;
1896 }
1897
1898 if (!sloppy && invalid) {
1899 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1900 goto cifs_parse_mount_err;
1901 }
1902
1903#ifndef CONFIG_KEYS
1904 /* Muliuser mounts require CONFIG_KEYS support */
1905 if (vol->multiuser) {
1906 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1907 goto cifs_parse_mount_err;
1908 }
1909#endif
1910 if (!vol->UNC) {
1911 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1912 goto cifs_parse_mount_err;
1913 }
1914
1915 /* make sure UNC has a share name */
1916 if (!strchr(vol->UNC + 3, '\\')) {
1917 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1918 goto cifs_parse_mount_err;
1919 }
1920
1921 if (!got_ip) {
1922 /* No ip= option specified? Try to get it from UNC */
1923 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1924 strlen(&vol->UNC[2]))) {
1925 pr_err("Unable to determine destination address.\n");
1926 goto cifs_parse_mount_err;
1927 }
1928 }
1929
1930 /* set the port that we got earlier */
1931 cifs_set_port(dstaddr, port);
1932
1933 if (uid_specified)
1934 vol->override_uid = override_uid;
1935 else if (override_uid == 1)
1936 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1937
1938 if (gid_specified)
1939 vol->override_gid = override_gid;
1940 else if (override_gid == 1)
1941 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1942
1943 kfree(mountdata_copy);
1944 return 0;
1945
1946out_nomem:
1947 pr_warn("Could not allocate temporary buffer\n");
1948cifs_parse_mount_err:
1949 kfree(string);
1950 kfree(mountdata_copy);
1951 return 1;
1952}
1953
1954/** Returns true if srcaddr isn't specified and rhs isn't
1955 * specified, or if srcaddr is specified and
1956 * matches the IP address of the rhs argument.
1957 */
1958static bool
1959srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1960{
1961 switch (srcaddr->sa_family) {
1962 case AF_UNSPEC:
1963 return (rhs->sa_family == AF_UNSPEC);
1964 case AF_INET: {
1965 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1966 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1967 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1968 }
1969 case AF_INET6: {
1970 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1971 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1972 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1973 }
1974 default:
1975 WARN_ON(1);
1976 return false; /* don't expect to be here */
1977 }
1978}
1979
1980/*
1981 * If no port is specified in addr structure, we try to match with 445 port
1982 * and if it fails - with 139 ports. It should be called only if address
1983 * families of server and addr are equal.
1984 */
1985static bool
1986match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1987{
1988 __be16 port, *sport;
1989
1990 switch (addr->sa_family) {
1991 case AF_INET:
1992 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1993 port = ((struct sockaddr_in *) addr)->sin_port;
1994 break;
1995 case AF_INET6:
1996 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1997 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1998 break;
1999 default:
2000 WARN_ON(1);
2001 return false;
2002 }
2003
2004 if (!port) {
2005 port = htons(CIFS_PORT);
2006 if (port == *sport)
2007 return true;
2008
2009 port = htons(RFC1001_PORT);
2010 }
2011
2012 return port == *sport;
2013}
2014
2015static bool
2016match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2017 struct sockaddr *srcaddr)
2018{
2019 switch (addr->sa_family) {
2020 case AF_INET: {
2021 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2022 struct sockaddr_in *srv_addr4 =
2023 (struct sockaddr_in *)&server->dstaddr;
2024
2025 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2026 return false;
2027 break;
2028 }
2029 case AF_INET6: {
2030 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2031 struct sockaddr_in6 *srv_addr6 =
2032 (struct sockaddr_in6 *)&server->dstaddr;
2033
2034 if (!ipv6_addr_equal(&addr6->sin6_addr,
2035 &srv_addr6->sin6_addr))
2036 return false;
2037 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2038 return false;
2039 break;
2040 }
2041 default:
2042 WARN_ON(1);
2043 return false; /* don't expect to be here */
2044 }
2045
2046 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2047 return false;
2048
2049 return true;
2050}
2051
2052static bool
2053match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2054{
2055 /*
2056 * The select_sectype function should either return the vol->sectype
2057 * that was specified, or "Unspecified" if that sectype was not
2058 * compatible with the given NEGOTIATE request.
2059 */
2060 if (select_sectype(server, vol->sectype) == Unspecified)
2061 return false;
2062
2063 /*
2064 * Now check if signing mode is acceptable. No need to check
2065 * global_secflags at this point since if MUST_SIGN is set then
2066 * the server->sign had better be too.
2067 */
2068 if (vol->sign && !server->sign)
2069 return false;
2070
2071 return true;
2072}
2073
2074static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2075{
2076 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2077
2078 if (vol->nosharesock)
2079 return 0;
2080
2081 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2082 return 0;
2083
2084 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2085 return 0;
2086
2087 if (!match_address(server, addr,
2088 (struct sockaddr *)&vol->srcaddr))
2089 return 0;
2090
2091 if (!match_port(server, addr))
2092 return 0;
2093
2094 if (!match_security(server, vol))
2095 return 0;
2096
2097 if (server->echo_interval != vol->echo_interval * HZ)
2098 return 0;
2099
2100 return 1;
2101}
2102
2103static struct TCP_Server_Info *
2104cifs_find_tcp_session(struct smb_vol *vol)
2105{
2106 struct TCP_Server_Info *server;
2107
2108 spin_lock(&cifs_tcp_ses_lock);
2109 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2110 if (!match_server(server, vol))
2111 continue;
2112
2113 ++server->srv_count;
2114 spin_unlock(&cifs_tcp_ses_lock);
2115 cifs_dbg(FYI, "Existing tcp session with server found\n");
2116 return server;
2117 }
2118 spin_unlock(&cifs_tcp_ses_lock);
2119 return NULL;
2120}
2121
2122void
2123cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2124{
2125 struct task_struct *task;
2126
2127 spin_lock(&cifs_tcp_ses_lock);
2128 if (--server->srv_count > 0) {
2129 spin_unlock(&cifs_tcp_ses_lock);
2130 return;
2131 }
2132
2133 put_net(cifs_net_ns(server));
2134
2135 list_del_init(&server->tcp_ses_list);
2136 spin_unlock(&cifs_tcp_ses_lock);
2137
2138 cancel_delayed_work_sync(&server->echo);
2139
2140#ifdef CONFIG_CIFS_SMB2
2141 if (from_reconnect)
2142 /*
2143 * Avoid deadlock here: reconnect work calls
2144 * cifs_put_tcp_session() at its end. Need to be sure
2145 * that reconnect work does nothing with server pointer after
2146 * that step.
2147 */
2148 cancel_delayed_work(&server->reconnect);
2149 else
2150 cancel_delayed_work_sync(&server->reconnect);
2151#endif
2152
2153 spin_lock(&GlobalMid_Lock);
2154 server->tcpStatus = CifsExiting;
2155 spin_unlock(&GlobalMid_Lock);
2156
2157 cifs_crypto_shash_release(server);
2158 cifs_fscache_release_client_cookie(server);
2159
2160 kfree(server->session_key.response);
2161 server->session_key.response = NULL;
2162 server->session_key.len = 0;
2163
2164 task = xchg(&server->tsk, NULL);
2165 if (task)
2166 force_sig(SIGKILL, task);
2167}
2168
2169static struct TCP_Server_Info *
2170cifs_get_tcp_session(struct smb_vol *volume_info)
2171{
2172 struct TCP_Server_Info *tcp_ses = NULL;
2173 int rc;
2174
2175 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2176
2177 /* see if we already have a matching tcp_ses */
2178 tcp_ses = cifs_find_tcp_session(volume_info);
2179 if (tcp_ses)
2180 return tcp_ses;
2181
2182 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2183 if (!tcp_ses) {
2184 rc = -ENOMEM;
2185 goto out_err;
2186 }
2187
2188 tcp_ses->ops = volume_info->ops;
2189 tcp_ses->vals = volume_info->vals;
2190 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2191 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2192 if (IS_ERR(tcp_ses->hostname)) {
2193 rc = PTR_ERR(tcp_ses->hostname);
2194 goto out_err_crypto_release;
2195 }
2196
2197 tcp_ses->noblocksnd = volume_info->noblocksnd;
2198 tcp_ses->noautotune = volume_info->noautotune;
2199 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2200 tcp_ses->in_flight = 0;
2201 tcp_ses->credits = 1;
2202 init_waitqueue_head(&tcp_ses->response_q);
2203 init_waitqueue_head(&tcp_ses->request_q);
2204 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2205 mutex_init(&tcp_ses->srv_mutex);
2206 memcpy(tcp_ses->workstation_RFC1001_name,
2207 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2208 memcpy(tcp_ses->server_RFC1001_name,
2209 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2210 tcp_ses->session_estab = false;
2211 tcp_ses->sequence_number = 0;
2212 tcp_ses->lstrp = jiffies;
2213 spin_lock_init(&tcp_ses->req_lock);
2214 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2215 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2216 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2217#ifdef CONFIG_CIFS_SMB2
2218 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2219 mutex_init(&tcp_ses->reconnect_mutex);
2220#endif
2221 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2222 sizeof(tcp_ses->srcaddr));
2223 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2224 sizeof(tcp_ses->dstaddr));
2225#ifdef CONFIG_CIFS_SMB2
2226 generate_random_uuid(tcp_ses->client_guid);
2227#endif
2228 /*
2229 * at this point we are the only ones with the pointer
2230 * to the struct since the kernel thread not created yet
2231 * no need to spinlock this init of tcpStatus or srv_count
2232 */
2233 tcp_ses->tcpStatus = CifsNew;
2234 ++tcp_ses->srv_count;
2235
2236 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2237 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2238 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2239 else
2240 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2241
2242 rc = ip_connect(tcp_ses);
2243 if (rc < 0) {
2244 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2245 goto out_err_crypto_release;
2246 }
2247
2248 /*
2249 * since we're in a cifs function already, we know that
2250 * this will succeed. No need for try_module_get().
2251 */
2252 __module_get(THIS_MODULE);
2253 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2254 tcp_ses, "cifsd");
2255 if (IS_ERR(tcp_ses->tsk)) {
2256 rc = PTR_ERR(tcp_ses->tsk);
2257 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2258 module_put(THIS_MODULE);
2259 goto out_err_crypto_release;
2260 }
2261 tcp_ses->tcpStatus = CifsNeedNegotiate;
2262
2263 /* thread spawned, put it on the list */
2264 spin_lock(&cifs_tcp_ses_lock);
2265 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2266 spin_unlock(&cifs_tcp_ses_lock);
2267
2268 cifs_fscache_get_client_cookie(tcp_ses);
2269
2270 /* queue echo request delayed work */
2271 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2272
2273 return tcp_ses;
2274
2275out_err_crypto_release:
2276 cifs_crypto_shash_release(tcp_ses);
2277
2278 put_net(cifs_net_ns(tcp_ses));
2279
2280out_err:
2281 if (tcp_ses) {
2282 if (!IS_ERR(tcp_ses->hostname))
2283 kfree(tcp_ses->hostname);
2284 if (tcp_ses->ssocket)
2285 sock_release(tcp_ses->ssocket);
2286 kfree(tcp_ses);
2287 }
2288 return ERR_PTR(rc);
2289}
2290
2291static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2292{
2293 if (vol->sectype != Unspecified &&
2294 vol->sectype != ses->sectype)
2295 return 0;
2296
2297 switch (ses->sectype) {
2298 case Kerberos:
2299 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2300 return 0;
2301 break;
2302 default:
2303 /* NULL username means anonymous session */
2304 if (ses->user_name == NULL) {
2305 if (!vol->nullauth)
2306 return 0;
2307 break;
2308 }
2309
2310 /* anything else takes username/password */
2311 if (strncmp(ses->user_name,
2312 vol->username ? vol->username : "",
2313 CIFS_MAX_USERNAME_LEN))
2314 return 0;
2315 if ((vol->username && strlen(vol->username) != 0) &&
2316 ses->password != NULL &&
2317 strncmp(ses->password,
2318 vol->password ? vol->password : "",
2319 CIFS_MAX_PASSWORD_LEN))
2320 return 0;
2321 }
2322 return 1;
2323}
2324
2325static struct cifs_ses *
2326cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2327{
2328 struct cifs_ses *ses;
2329
2330 spin_lock(&cifs_tcp_ses_lock);
2331 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2332 if (ses->status == CifsExiting)
2333 continue;
2334 if (!match_session(ses, vol))
2335 continue;
2336 ++ses->ses_count;
2337 spin_unlock(&cifs_tcp_ses_lock);
2338 return ses;
2339 }
2340 spin_unlock(&cifs_tcp_ses_lock);
2341 return NULL;
2342}
2343
2344static void
2345cifs_put_smb_ses(struct cifs_ses *ses)
2346{
2347 unsigned int rc, xid;
2348 struct TCP_Server_Info *server = ses->server;
2349
2350 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2351
2352 spin_lock(&cifs_tcp_ses_lock);
2353 if (ses->status == CifsExiting) {
2354 spin_unlock(&cifs_tcp_ses_lock);
2355 return;
2356 }
2357 if (--ses->ses_count > 0) {
2358 spin_unlock(&cifs_tcp_ses_lock);
2359 return;
2360 }
2361 if (ses->status == CifsGood)
2362 ses->status = CifsExiting;
2363 spin_unlock(&cifs_tcp_ses_lock);
2364
2365 if (ses->status == CifsExiting && server->ops->logoff) {
2366 xid = get_xid();
2367 rc = server->ops->logoff(xid, ses);
2368 if (rc)
2369 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2370 __func__, rc);
2371 _free_xid(xid);
2372 }
2373
2374 spin_lock(&cifs_tcp_ses_lock);
2375 list_del_init(&ses->smb_ses_list);
2376 spin_unlock(&cifs_tcp_ses_lock);
2377
2378 sesInfoFree(ses);
2379 cifs_put_tcp_session(server, 0);
2380}
2381
2382#ifdef CONFIG_KEYS
2383
2384/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2385#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2386
2387/* Populate username and pw fields from keyring if possible */
2388static int
2389cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2390{
2391 int rc = 0;
2392 const char *delim, *payload;
2393 char *desc;
2394 ssize_t len;
2395 struct key *key;
2396 struct TCP_Server_Info *server = ses->server;
2397 struct sockaddr_in *sa;
2398 struct sockaddr_in6 *sa6;
2399 const struct user_key_payload *upayload;
2400
2401 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2402 if (!desc)
2403 return -ENOMEM;
2404
2405 /* try to find an address key first */
2406 switch (server->dstaddr.ss_family) {
2407 case AF_INET:
2408 sa = (struct sockaddr_in *)&server->dstaddr;
2409 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2410 break;
2411 case AF_INET6:
2412 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2413 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2414 break;
2415 default:
2416 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2417 server->dstaddr.ss_family);
2418 rc = -EINVAL;
2419 goto out_err;
2420 }
2421
2422 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2423 key = request_key(&key_type_logon, desc, "");
2424 if (IS_ERR(key)) {
2425 if (!ses->domainName) {
2426 cifs_dbg(FYI, "domainName is NULL\n");
2427 rc = PTR_ERR(key);
2428 goto out_err;
2429 }
2430
2431 /* didn't work, try to find a domain key */
2432 sprintf(desc, "cifs:d:%s", ses->domainName);
2433 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2434 key = request_key(&key_type_logon, desc, "");
2435 if (IS_ERR(key)) {
2436 rc = PTR_ERR(key);
2437 goto out_err;
2438 }
2439 }
2440
2441 down_read(&key->sem);
2442 upayload = user_key_payload(key);
2443 if (IS_ERR_OR_NULL(upayload)) {
2444 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2445 goto out_key_put;
2446 }
2447
2448 /* find first : in payload */
2449 payload = upayload->data;
2450 delim = strnchr(payload, upayload->datalen, ':');
2451 cifs_dbg(FYI, "payload=%s\n", payload);
2452 if (!delim) {
2453 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2454 upayload->datalen);
2455 rc = -EINVAL;
2456 goto out_key_put;
2457 }
2458
2459 len = delim - payload;
2460 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2461 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2462 len);
2463 rc = -EINVAL;
2464 goto out_key_put;
2465 }
2466
2467 vol->username = kstrndup(payload, len, GFP_KERNEL);
2468 if (!vol->username) {
2469 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2470 len);
2471 rc = -ENOMEM;
2472 goto out_key_put;
2473 }
2474 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2475
2476 len = key->datalen - (len + 1);
2477 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2478 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2479 rc = -EINVAL;
2480 kfree(vol->username);
2481 vol->username = NULL;
2482 goto out_key_put;
2483 }
2484
2485 ++delim;
2486 vol->password = kstrndup(delim, len, GFP_KERNEL);
2487 if (!vol->password) {
2488 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2489 len);
2490 rc = -ENOMEM;
2491 kfree(vol->username);
2492 vol->username = NULL;
2493 goto out_key_put;
2494 }
2495
2496out_key_put:
2497 up_read(&key->sem);
2498 key_put(key);
2499out_err:
2500 kfree(desc);
2501 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2502 return rc;
2503}
2504#else /* ! CONFIG_KEYS */
2505static inline int
2506cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2507 struct cifs_ses *ses __attribute__((unused)))
2508{
2509 return -ENOSYS;
2510}
2511#endif /* CONFIG_KEYS */
2512
2513static struct cifs_ses *
2514cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2515{
2516 int rc = -ENOMEM;
2517 unsigned int xid;
2518 struct cifs_ses *ses;
2519 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2520 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2521
2522 xid = get_xid();
2523
2524 ses = cifs_find_smb_ses(server, volume_info);
2525 if (ses) {
2526 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2527 ses->status);
2528
2529 mutex_lock(&ses->session_mutex);
2530 rc = cifs_negotiate_protocol(xid, ses);
2531 if (rc) {
2532 mutex_unlock(&ses->session_mutex);
2533 /* problem -- put our ses reference */
2534 cifs_put_smb_ses(ses);
2535 free_xid(xid);
2536 return ERR_PTR(rc);
2537 }
2538 if (ses->need_reconnect) {
2539 cifs_dbg(FYI, "Session needs reconnect\n");
2540 rc = cifs_setup_session(xid, ses,
2541 volume_info->local_nls);
2542 if (rc) {
2543 mutex_unlock(&ses->session_mutex);
2544 /* problem -- put our reference */
2545 cifs_put_smb_ses(ses);
2546 free_xid(xid);
2547 return ERR_PTR(rc);
2548 }
2549 }
2550 mutex_unlock(&ses->session_mutex);
2551
2552 /* existing SMB ses has a server reference already */
2553 cifs_put_tcp_session(server, 0);
2554 free_xid(xid);
2555 return ses;
2556 }
2557
2558 cifs_dbg(FYI, "Existing smb sess not found\n");
2559 ses = sesInfoAlloc();
2560 if (ses == NULL)
2561 goto get_ses_fail;
2562
2563 /* new SMB session uses our server ref */
2564 ses->server = server;
2565 if (server->dstaddr.ss_family == AF_INET6)
2566 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2567 else
2568 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2569
2570 if (volume_info->username) {
2571 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2572 if (!ses->user_name)
2573 goto get_ses_fail;
2574 }
2575
2576 /* volume_info->password freed at unmount */
2577 if (volume_info->password) {
2578 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2579 if (!ses->password)
2580 goto get_ses_fail;
2581 }
2582 if (volume_info->domainname) {
2583 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2584 if (!ses->domainName)
2585 goto get_ses_fail;
2586 }
2587 if (volume_info->domainauto)
2588 ses->domainAuto = volume_info->domainauto;
2589 ses->cred_uid = volume_info->cred_uid;
2590 ses->linux_uid = volume_info->linux_uid;
2591
2592 ses->sectype = volume_info->sectype;
2593 ses->sign = volume_info->sign;
2594
2595 mutex_lock(&ses->session_mutex);
2596 rc = cifs_negotiate_protocol(xid, ses);
2597 if (!rc)
2598 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2599 mutex_unlock(&ses->session_mutex);
2600 if (rc)
2601 goto get_ses_fail;
2602
2603 /* success, put it on the list */
2604 spin_lock(&cifs_tcp_ses_lock);
2605 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2606 spin_unlock(&cifs_tcp_ses_lock);
2607
2608 free_xid(xid);
2609 return ses;
2610
2611get_ses_fail:
2612 sesInfoFree(ses);
2613 free_xid(xid);
2614 return ERR_PTR(rc);
2615}
2616
2617static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2618{
2619 if (tcon->tidStatus == CifsExiting)
2620 return 0;
2621 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2622 return 0;
2623 return 1;
2624}
2625
2626static struct cifs_tcon *
2627cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2628{
2629 struct list_head *tmp;
2630 struct cifs_tcon *tcon;
2631
2632 spin_lock(&cifs_tcp_ses_lock);
2633 list_for_each(tmp, &ses->tcon_list) {
2634 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2635 if (!match_tcon(tcon, volume_info->UNC))
2636 continue;
2637
2638#ifdef CONFIG_CIFS_SMB2
2639 if (tcon->snapshot_time != volume_info->snapshot_time)
2640 continue;
2641#endif /* CONFIG_CIFS_SMB2 */
2642
2643 ++tcon->tc_count;
2644 spin_unlock(&cifs_tcp_ses_lock);
2645 return tcon;
2646 }
2647 spin_unlock(&cifs_tcp_ses_lock);
2648 return NULL;
2649}
2650
2651void
2652cifs_put_tcon(struct cifs_tcon *tcon)
2653{
2654 unsigned int xid;
2655 struct cifs_ses *ses = tcon->ses;
2656
2657 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2658 spin_lock(&cifs_tcp_ses_lock);
2659 if (--tcon->tc_count > 0) {
2660 spin_unlock(&cifs_tcp_ses_lock);
2661 return;
2662 }
2663
2664 list_del_init(&tcon->tcon_list);
2665 spin_unlock(&cifs_tcp_ses_lock);
2666
2667 xid = get_xid();
2668 if (ses->server->ops->tree_disconnect)
2669 ses->server->ops->tree_disconnect(xid, tcon);
2670 _free_xid(xid);
2671
2672 cifs_fscache_release_super_cookie(tcon);
2673 tconInfoFree(tcon);
2674 cifs_put_smb_ses(ses);
2675}
2676
2677static struct cifs_tcon *
2678cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2679{
2680 int rc, xid;
2681 struct cifs_tcon *tcon;
2682
2683 tcon = cifs_find_tcon(ses, volume_info);
2684 if (tcon) {
2685 cifs_dbg(FYI, "Found match on UNC path\n");
2686 /* existing tcon already has a reference */
2687 cifs_put_smb_ses(ses);
2688 if (tcon->seal != volume_info->seal)
2689 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2690 return tcon;
2691 }
2692
2693 if (!ses->server->ops->tree_connect) {
2694 rc = -ENOSYS;
2695 goto out_fail;
2696 }
2697
2698 tcon = tconInfoAlloc();
2699 if (tcon == NULL) {
2700 rc = -ENOMEM;
2701 goto out_fail;
2702 }
2703
2704 if (volume_info->snapshot_time) {
2705#ifdef CONFIG_CIFS_SMB2
2706 if (ses->server->vals->protocol_id == 0) {
2707 cifs_dbg(VFS,
2708 "Use SMB2 or later for snapshot mount option\n");
2709 rc = -EOPNOTSUPP;
2710 goto out_fail;
2711 } else
2712 tcon->snapshot_time = volume_info->snapshot_time;
2713#else
2714 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2715 rc = -EOPNOTSUPP;
2716 goto out_fail;
2717#endif /* CONFIG_CIFS_SMB2 */
2718 }
2719
2720 tcon->ses = ses;
2721 if (volume_info->password) {
2722 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2723 if (!tcon->password) {
2724 rc = -ENOMEM;
2725 goto out_fail;
2726 }
2727 }
2728
2729 /*
2730 * BB Do we need to wrap session_mutex around this TCon call and Unix
2731 * SetFS as we do on SessSetup and reconnect?
2732 */
2733 xid = get_xid();
2734 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2735 volume_info->local_nls);
2736 free_xid(xid);
2737 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2738 if (rc)
2739 goto out_fail;
2740
2741 if (volume_info->nodfs) {
2742 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2743 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2744 }
2745 tcon->seal = volume_info->seal;
2746 tcon->use_persistent = false;
2747 /* check if SMB2 or later, CIFS does not support persistent handles */
2748 if (volume_info->persistent) {
2749 if (ses->server->vals->protocol_id == 0) {
2750 cifs_dbg(VFS,
2751 "SMB3 or later required for persistent handles\n");
2752 rc = -EOPNOTSUPP;
2753 goto out_fail;
2754#ifdef CONFIG_CIFS_SMB2
2755 } else if (ses->server->capabilities &
2756 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2757 tcon->use_persistent = true;
2758 else /* persistent handles requested but not supported */ {
2759 cifs_dbg(VFS,
2760 "Persistent handles not supported on share\n");
2761 rc = -EOPNOTSUPP;
2762 goto out_fail;
2763#endif /* CONFIG_CIFS_SMB2 */
2764 }
2765#ifdef CONFIG_CIFS_SMB2
2766 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2767 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2768 && (volume_info->nopersistent == false)) {
2769 cifs_dbg(FYI, "enabling persistent handles\n");
2770 tcon->use_persistent = true;
2771#endif /* CONFIG_CIFS_SMB2 */
2772 } else if (volume_info->resilient) {
2773 if (ses->server->vals->protocol_id == 0) {
2774 cifs_dbg(VFS,
2775 "SMB2.1 or later required for resilient handles\n");
2776 rc = -EOPNOTSUPP;
2777 goto out_fail;
2778 }
2779 tcon->use_resilient = true;
2780 }
2781
2782 /*
2783 * We can have only one retry value for a connection to a share so for
2784 * resources mounted more than once to the same server share the last
2785 * value passed in for the retry flag is used.
2786 */
2787 tcon->retry = volume_info->retry;
2788 tcon->nocase = volume_info->nocase;
2789 tcon->local_lease = volume_info->local_lease;
2790 INIT_LIST_HEAD(&tcon->pending_opens);
2791
2792 spin_lock(&cifs_tcp_ses_lock);
2793 list_add(&tcon->tcon_list, &ses->tcon_list);
2794 spin_unlock(&cifs_tcp_ses_lock);
2795
2796 cifs_fscache_get_super_cookie(tcon);
2797
2798 return tcon;
2799
2800out_fail:
2801 tconInfoFree(tcon);
2802 return ERR_PTR(rc);
2803}
2804
2805void
2806cifs_put_tlink(struct tcon_link *tlink)
2807{
2808 if (!tlink || IS_ERR(tlink))
2809 return;
2810
2811 if (!atomic_dec_and_test(&tlink->tl_count) ||
2812 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2813 tlink->tl_time = jiffies;
2814 return;
2815 }
2816
2817 if (!IS_ERR(tlink_tcon(tlink)))
2818 cifs_put_tcon(tlink_tcon(tlink));
2819 kfree(tlink);
2820 return;
2821}
2822
2823static inline struct tcon_link *
2824cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2825{
2826 return cifs_sb->master_tlink;
2827}
2828
2829static int
2830compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2831{
2832 struct cifs_sb_info *old = CIFS_SB(sb);
2833 struct cifs_sb_info *new = mnt_data->cifs_sb;
2834
2835 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2836 return 0;
2837
2838 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2839 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2840 return 0;
2841
2842 /*
2843 * We want to share sb only if we don't specify an r/wsize or
2844 * specified r/wsize is greater than or equal to existing one.
2845 */
2846 if (new->wsize && new->wsize < old->wsize)
2847 return 0;
2848
2849 if (new->rsize && new->rsize < old->rsize)
2850 return 0;
2851
2852 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2853 return 0;
2854
2855 if (old->mnt_file_mode != new->mnt_file_mode ||
2856 old->mnt_dir_mode != new->mnt_dir_mode)
2857 return 0;
2858
2859 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2860 return 0;
2861
2862 if (old->actimeo != new->actimeo)
2863 return 0;
2864
2865 return 1;
2866}
2867
2868static int
2869match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2870{
2871 struct cifs_sb_info *old = CIFS_SB(sb);
2872 struct cifs_sb_info *new = mnt_data->cifs_sb;
2873
2874 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2875 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2876 return 0;
2877 /* The prepath should be null terminated strings */
2878 if (strcmp(new->prepath, old->prepath))
2879 return 0;
2880
2881 return 1;
2882 }
2883 return 0;
2884}
2885
2886int
2887cifs_match_super(struct super_block *sb, void *data)
2888{
2889 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2890 struct smb_vol *volume_info;
2891 struct cifs_sb_info *cifs_sb;
2892 struct TCP_Server_Info *tcp_srv;
2893 struct cifs_ses *ses;
2894 struct cifs_tcon *tcon;
2895 struct tcon_link *tlink;
2896 int rc = 0;
2897
2898 spin_lock(&cifs_tcp_ses_lock);
2899 cifs_sb = CIFS_SB(sb);
2900 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2901 if (IS_ERR(tlink)) {
2902 spin_unlock(&cifs_tcp_ses_lock);
2903 return rc;
2904 }
2905 tcon = tlink_tcon(tlink);
2906 ses = tcon->ses;
2907 tcp_srv = ses->server;
2908
2909 volume_info = mnt_data->vol;
2910
2911 if (!match_server(tcp_srv, volume_info) ||
2912 !match_session(ses, volume_info) ||
2913 !match_tcon(tcon, volume_info->UNC) ||
2914 !match_prepath(sb, mnt_data)) {
2915 rc = 0;
2916 goto out;
2917 }
2918
2919 rc = compare_mount_options(sb, mnt_data);
2920out:
2921 spin_unlock(&cifs_tcp_ses_lock);
2922 cifs_put_tlink(tlink);
2923 return rc;
2924}
2925
2926int
2927get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2928 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2929 struct dfs_info3_param **referrals, int remap)
2930{
2931 char *temp_unc;
2932 int rc = 0;
2933
2934 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2935 return -ENOSYS;
2936
2937 *num_referrals = 0;
2938 *referrals = NULL;
2939
2940 if (ses->ipc_tid == 0) {
2941 temp_unc = kmalloc(2 /* for slashes */ +
2942 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2943 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2944 if (temp_unc == NULL)
2945 return -ENOMEM;
2946 temp_unc[0] = '\\';
2947 temp_unc[1] = '\\';
2948 strcpy(temp_unc + 2, ses->serverName);
2949 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2950 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2951 nls_codepage);
2952 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2953 kfree(temp_unc);
2954 }
2955 if (rc == 0)
2956 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2957 referrals, num_referrals,
2958 nls_codepage, remap);
2959 /*
2960 * BB - map targetUNCs to dfs_info3 structures, here or in
2961 * ses->server->ops->get_dfs_refer.
2962 */
2963
2964 return rc;
2965}
2966
2967#ifdef CONFIG_DEBUG_LOCK_ALLOC
2968static struct lock_class_key cifs_key[2];
2969static struct lock_class_key cifs_slock_key[2];
2970
2971static inline void
2972cifs_reclassify_socket4(struct socket *sock)
2973{
2974 struct sock *sk = sock->sk;
2975 BUG_ON(!sock_allow_reclassification(sk));
2976 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2977 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2978}
2979
2980static inline void
2981cifs_reclassify_socket6(struct socket *sock)
2982{
2983 struct sock *sk = sock->sk;
2984 BUG_ON(!sock_allow_reclassification(sk));
2985 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2986 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2987}
2988#else
2989static inline void
2990cifs_reclassify_socket4(struct socket *sock)
2991{
2992}
2993
2994static inline void
2995cifs_reclassify_socket6(struct socket *sock)
2996{
2997}
2998#endif
2999
3000/* See RFC1001 section 14 on representation of Netbios names */
3001static void rfc1002mangle(char *target, char *source, unsigned int length)
3002{
3003 unsigned int i, j;
3004
3005 for (i = 0, j = 0; i < (length); i++) {
3006 /* mask a nibble at a time and encode */
3007 target[j] = 'A' + (0x0F & (source[i] >> 4));
3008 target[j+1] = 'A' + (0x0F & source[i]);
3009 j += 2;
3010 }
3011
3012}
3013
3014static int
3015bind_socket(struct TCP_Server_Info *server)
3016{
3017 int rc = 0;
3018 if (server->srcaddr.ss_family != AF_UNSPEC) {
3019 /* Bind to the specified local IP address */
3020 struct socket *socket = server->ssocket;
3021 rc = socket->ops->bind(socket,
3022 (struct sockaddr *) &server->srcaddr,
3023 sizeof(server->srcaddr));
3024 if (rc < 0) {
3025 struct sockaddr_in *saddr4;
3026 struct sockaddr_in6 *saddr6;
3027 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3028 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3029 if (saddr6->sin6_family == AF_INET6)
3030 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3031 &saddr6->sin6_addr, rc);
3032 else
3033 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3034 &saddr4->sin_addr.s_addr, rc);
3035 }
3036 }
3037 return rc;
3038}
3039
3040static int
3041ip_rfc1001_connect(struct TCP_Server_Info *server)
3042{
3043 int rc = 0;
3044 /*
3045 * some servers require RFC1001 sessinit before sending
3046 * negprot - BB check reconnection in case where second
3047 * sessinit is sent but no second negprot
3048 */
3049 struct rfc1002_session_packet *ses_init_buf;
3050 struct smb_hdr *smb_buf;
3051 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3052 GFP_KERNEL);
3053 if (ses_init_buf) {
3054 ses_init_buf->trailer.session_req.called_len = 32;
3055
3056 if (server->server_RFC1001_name[0] != 0)
3057 rfc1002mangle(ses_init_buf->trailer.
3058 session_req.called_name,
3059 server->server_RFC1001_name,
3060 RFC1001_NAME_LEN_WITH_NULL);
3061 else
3062 rfc1002mangle(ses_init_buf->trailer.
3063 session_req.called_name,
3064 DEFAULT_CIFS_CALLED_NAME,
3065 RFC1001_NAME_LEN_WITH_NULL);
3066
3067 ses_init_buf->trailer.session_req.calling_len = 32;
3068
3069 /*
3070 * calling name ends in null (byte 16) from old smb
3071 * convention.
3072 */
3073 if (server->workstation_RFC1001_name[0] != 0)
3074 rfc1002mangle(ses_init_buf->trailer.
3075 session_req.calling_name,
3076 server->workstation_RFC1001_name,
3077 RFC1001_NAME_LEN_WITH_NULL);
3078 else
3079 rfc1002mangle(ses_init_buf->trailer.
3080 session_req.calling_name,
3081 "LINUX_CIFS_CLNT",
3082 RFC1001_NAME_LEN_WITH_NULL);
3083
3084 ses_init_buf->trailer.session_req.scope1 = 0;
3085 ses_init_buf->trailer.session_req.scope2 = 0;
3086 smb_buf = (struct smb_hdr *)ses_init_buf;
3087
3088 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3089 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3090 rc = smb_send(server, smb_buf, 0x44);
3091 kfree(ses_init_buf);
3092 /*
3093 * RFC1001 layer in at least one server
3094 * requires very short break before negprot
3095 * presumably because not expecting negprot
3096 * to follow so fast. This is a simple
3097 * solution that works without
3098 * complicating the code and causes no
3099 * significant slowing down on mount
3100 * for everyone else
3101 */
3102 usleep_range(1000, 2000);
3103 }
3104 /*
3105 * else the negprot may still work without this
3106 * even though malloc failed
3107 */
3108
3109 return rc;
3110}
3111
3112static int
3113generic_ip_connect(struct TCP_Server_Info *server)
3114{
3115 int rc = 0;
3116 __be16 sport;
3117 int slen, sfamily;
3118 struct socket *socket = server->ssocket;
3119 struct sockaddr *saddr;
3120
3121 saddr = (struct sockaddr *) &server->dstaddr;
3122
3123 if (server->dstaddr.ss_family == AF_INET6) {
3124 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3125 slen = sizeof(struct sockaddr_in6);
3126 sfamily = AF_INET6;
3127 } else {
3128 sport = ((struct sockaddr_in *) saddr)->sin_port;
3129 slen = sizeof(struct sockaddr_in);
3130 sfamily = AF_INET;
3131 }
3132
3133 if (socket == NULL) {
3134 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3135 IPPROTO_TCP, &socket, 1);
3136 if (rc < 0) {
3137 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3138 server->ssocket = NULL;
3139 return rc;
3140 }
3141
3142 /* BB other socket options to set KEEPALIVE, NODELAY? */
3143 cifs_dbg(FYI, "Socket created\n");
3144 server->ssocket = socket;
3145 socket->sk->sk_allocation = GFP_NOFS;
3146 if (sfamily == AF_INET6)
3147 cifs_reclassify_socket6(socket);
3148 else
3149 cifs_reclassify_socket4(socket);
3150 }
3151
3152 rc = bind_socket(server);
3153 if (rc < 0)
3154 return rc;
3155
3156 /*
3157 * Eventually check for other socket options to change from
3158 * the default. sock_setsockopt not used because it expects
3159 * user space buffer
3160 */
3161 socket->sk->sk_rcvtimeo = 7 * HZ;
3162 socket->sk->sk_sndtimeo = 5 * HZ;
3163
3164 /* make the bufsizes depend on wsize/rsize and max requests */
3165 if (server->noautotune) {
3166 if (socket->sk->sk_sndbuf < (200 * 1024))
3167 socket->sk->sk_sndbuf = 200 * 1024;
3168 if (socket->sk->sk_rcvbuf < (140 * 1024))
3169 socket->sk->sk_rcvbuf = 140 * 1024;
3170 }
3171
3172 if (server->tcp_nodelay) {
3173 int val = 1;
3174 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3175 (char *)&val, sizeof(val));
3176 if (rc)
3177 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3178 rc);
3179 }
3180
3181 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3182 socket->sk->sk_sndbuf,
3183 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3184
3185 rc = socket->ops->connect(socket, saddr, slen, 0);
3186 if (rc < 0) {
3187 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3188 sock_release(socket);
3189 server->ssocket = NULL;
3190 return rc;
3191 }
3192
3193 if (sport == htons(RFC1001_PORT))
3194 rc = ip_rfc1001_connect(server);
3195
3196 return rc;
3197}
3198
3199static int
3200ip_connect(struct TCP_Server_Info *server)
3201{
3202 __be16 *sport;
3203 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3204 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3205
3206 if (server->dstaddr.ss_family == AF_INET6)
3207 sport = &addr6->sin6_port;
3208 else
3209 sport = &addr->sin_port;
3210
3211 if (*sport == 0) {
3212 int rc;
3213
3214 /* try with 445 port at first */
3215 *sport = htons(CIFS_PORT);
3216
3217 rc = generic_ip_connect(server);
3218 if (rc >= 0)
3219 return rc;
3220
3221 /* if it failed, try with 139 port */
3222 *sport = htons(RFC1001_PORT);
3223 }
3224
3225 return generic_ip_connect(server);
3226}
3227
3228void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3229 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3230{
3231 /* if we are reconnecting then should we check to see if
3232 * any requested capabilities changed locally e.g. via
3233 * remount but we can not do much about it here
3234 * if they have (even if we could detect it by the following)
3235 * Perhaps we could add a backpointer to array of sb from tcon
3236 * or if we change to make all sb to same share the same
3237 * sb as NFS - then we only have one backpointer to sb.
3238 * What if we wanted to mount the server share twice once with
3239 * and once without posixacls or posix paths? */
3240 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3241
3242 if (vol_info && vol_info->no_linux_ext) {
3243 tcon->fsUnixInfo.Capability = 0;
3244 tcon->unix_ext = 0; /* Unix Extensions disabled */
3245 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3246 return;
3247 } else if (vol_info)
3248 tcon->unix_ext = 1; /* Unix Extensions supported */
3249
3250 if (tcon->unix_ext == 0) {
3251 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3252 return;
3253 }
3254
3255 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3256 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3257 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3258 /* check for reconnect case in which we do not
3259 want to change the mount behavior if we can avoid it */
3260 if (vol_info == NULL) {
3261 /* turn off POSIX ACL and PATHNAMES if not set
3262 originally at mount time */
3263 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3264 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3265 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3266 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3267 cifs_dbg(VFS, "POSIXPATH support change\n");
3268 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3269 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3270 cifs_dbg(VFS, "possible reconnect error\n");
3271 cifs_dbg(VFS, "server disabled POSIX path support\n");
3272 }
3273 }
3274
3275 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3276 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3277
3278 cap &= CIFS_UNIX_CAP_MASK;
3279 if (vol_info && vol_info->no_psx_acl)
3280 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3281 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3282 cifs_dbg(FYI, "negotiated posix acl support\n");
3283 if (cifs_sb)
3284 cifs_sb->mnt_cifs_flags |=
3285 CIFS_MOUNT_POSIXACL;
3286 }
3287
3288 if (vol_info && vol_info->posix_paths == 0)
3289 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3290 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3291 cifs_dbg(FYI, "negotiate posix pathnames\n");
3292 if (cifs_sb)
3293 cifs_sb->mnt_cifs_flags |=
3294 CIFS_MOUNT_POSIX_PATHS;
3295 }
3296
3297 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3298#ifdef CONFIG_CIFS_DEBUG2
3299 if (cap & CIFS_UNIX_FCNTL_CAP)
3300 cifs_dbg(FYI, "FCNTL cap\n");
3301 if (cap & CIFS_UNIX_EXTATTR_CAP)
3302 cifs_dbg(FYI, "EXTATTR cap\n");
3303 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3304 cifs_dbg(FYI, "POSIX path cap\n");
3305 if (cap & CIFS_UNIX_XATTR_CAP)
3306 cifs_dbg(FYI, "XATTR cap\n");
3307 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3308 cifs_dbg(FYI, "POSIX ACL cap\n");
3309 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3310 cifs_dbg(FYI, "very large read cap\n");
3311 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3312 cifs_dbg(FYI, "very large write cap\n");
3313 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3314 cifs_dbg(FYI, "transport encryption cap\n");
3315 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3316 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3317#endif /* CIFS_DEBUG2 */
3318 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3319 if (vol_info == NULL) {
3320 cifs_dbg(FYI, "resetting capabilities failed\n");
3321 } else
3322 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");
3323
3324 }
3325 }
3326}
3327
3328int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3329 struct cifs_sb_info *cifs_sb)
3330{
3331 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3332
3333 spin_lock_init(&cifs_sb->tlink_tree_lock);
3334 cifs_sb->tlink_tree = RB_ROOT;
3335
3336 /*
3337 * Temporarily set r/wsize for matching superblock. If we end up using
3338 * new sb then client will later negotiate it downward if needed.
3339 */
3340 cifs_sb->rsize = pvolume_info->rsize;
3341 cifs_sb->wsize = pvolume_info->wsize;
3342
3343 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3344 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3345 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3346 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3347 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3348 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3349
3350 cifs_sb->actimeo = pvolume_info->actimeo;
3351 cifs_sb->local_nls = pvolume_info->local_nls;
3352
3353 if (pvolume_info->noperm)
3354 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3355 if (pvolume_info->setuids)
3356 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3357 if (pvolume_info->setuidfromacl)
3358 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3359 if (pvolume_info->server_ino)
3360 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3361 if (pvolume_info->remap)
3362 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3363 if (pvolume_info->sfu_remap)
3364 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3365 if (pvolume_info->no_xattr)
3366 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3367 if (pvolume_info->sfu_emul)
3368 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3369 if (pvolume_info->nobrl)
3370 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3371 if (pvolume_info->nostrictsync)
3372 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3373 if (pvolume_info->mand_lock)
3374 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3375 if (pvolume_info->rwpidforward)
3376 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3377 if (pvolume_info->cifs_acl)
3378 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3379 if (pvolume_info->backupuid_specified) {
3380 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3381 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3382 }
3383 if (pvolume_info->backupgid_specified) {
3384 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3385 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3386 }
3387 if (pvolume_info->override_uid)
3388 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3389 if (pvolume_info->override_gid)
3390 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3391 if (pvolume_info->dynperm)
3392 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3393 if (pvolume_info->fsc)
3394 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3395 if (pvolume_info->multiuser)
3396 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3397 CIFS_MOUNT_NO_PERM);
3398 if (pvolume_info->strict_io)
3399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3400 if (pvolume_info->direct_io) {
3401 cifs_dbg(FYI, "mounting share using direct i/o\n");
3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3403 }
3404 if (pvolume_info->mfsymlinks) {
3405 if (pvolume_info->sfu_emul) {
3406 /*
3407 * Our SFU ("Services for Unix" emulation does not allow
3408 * creating symlinks but does allow reading existing SFU
3409 * symlinks (it does allow both creating and reading SFU
3410 * style mknod and FIFOs though). When "mfsymlinks" and
3411 * "sfu" are both enabled at the same time, it allows
3412 * reading both types of symlinks, but will only create
3413 * them with mfsymlinks format. This allows better
3414 * Apple compatibility (probably better for Samba too)
3415 * while still recognizing old Windows style symlinks.
3416 */
3417 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3418 }
3419 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3420 }
3421
3422 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3423 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3424
3425 if (pvolume_info->prepath) {
3426 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3427 if (cifs_sb->prepath == NULL)
3428 return -ENOMEM;
3429 }
3430
3431 return 0;
3432}
3433
3434static void
3435cleanup_volume_info_contents(struct smb_vol *volume_info)
3436{
3437 kfree(volume_info->username);
3438 kzfree(volume_info->password);
3439 kfree(volume_info->UNC);
3440 kfree(volume_info->domainname);
3441 kfree(volume_info->iocharset);
3442 kfree(volume_info->prepath);
3443}
3444
3445void
3446cifs_cleanup_volume_info(struct smb_vol *volume_info)
3447{
3448 if (!volume_info)
3449 return;
3450 cleanup_volume_info_contents(volume_info);
3451 kfree(volume_info);
3452}
3453
3454
3455#ifdef CONFIG_CIFS_DFS_UPCALL
3456/*
3457 * cifs_build_path_to_root returns full path to root when we do not have an
3458 * exiting connection (tcon)
3459 */
3460static char *
3461build_unc_path_to_root(const struct smb_vol *vol,
3462 const struct cifs_sb_info *cifs_sb)
3463{
3464 char *full_path, *pos;
3465 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3466 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3467
3468 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3469 if (full_path == NULL)
3470 return ERR_PTR(-ENOMEM);
3471
3472 strncpy(full_path, vol->UNC, unc_len);
3473 pos = full_path + unc_len;
3474
3475 if (pplen) {
3476 *pos = CIFS_DIR_SEP(cifs_sb);
3477 strncpy(pos + 1, vol->prepath, pplen);
3478 pos += pplen;
3479 }
3480
3481 *pos = '\0'; /* add trailing null */
3482 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3483 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3484 return full_path;
3485}
3486
3487/*
3488 * Perform a dfs referral query for a share and (optionally) prefix
3489 *
3490 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3491 * to a string containing updated options for the submount. Otherwise it
3492 * will be left untouched.
3493 *
3494 * Returns the rc from get_dfs_path to the caller, which can be used to
3495 * determine whether there were referrals.
3496 */
3497static int
3498expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3499 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3500 int check_prefix)
3501{
3502 int rc;
3503 unsigned int num_referrals = 0;
3504 struct dfs_info3_param *referrals = NULL;
3505 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3506
3507 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3508 if (IS_ERR(full_path))
3509 return PTR_ERR(full_path);
3510
3511 /* For DFS paths, skip the first '\' of the UNC */
3512 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3513
3514 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3515 &num_referrals, &referrals, cifs_remap(cifs_sb));
3516
3517 if (!rc && num_referrals > 0) {
3518 char *fake_devname = NULL;
3519
3520 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3521 full_path + 1, referrals,
3522 &fake_devname);
3523
3524 free_dfs_info_array(referrals, num_referrals);
3525
3526 if (IS_ERR(mdata)) {
3527 rc = PTR_ERR(mdata);
3528 mdata = NULL;
3529 } else {
3530 cleanup_volume_info_contents(volume_info);
3531 rc = cifs_setup_volume_info(volume_info, mdata,
3532 fake_devname);
3533 }
3534 kfree(fake_devname);
3535 kfree(cifs_sb->mountdata);
3536 cifs_sb->mountdata = mdata;
3537 }
3538 kfree(full_path);
3539 return rc;
3540}
3541#endif
3542
3543static int
3544cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3545 const char *devname)
3546{
3547 int rc = 0;
3548
3549 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3550 return -EINVAL;
3551
3552 if (volume_info->nullauth) {
3553 cifs_dbg(FYI, "Anonymous login\n");
3554 kfree(volume_info->username);
3555 volume_info->username = NULL;
3556 } else if (volume_info->username) {
3557 /* BB fixme parse for domain name here */
3558 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3559 } else {
3560 cifs_dbg(VFS, "No username specified\n");
3561 /* In userspace mount helper we can get user name from alternate
3562 locations such as env variables and files on disk */
3563 return -EINVAL;
3564 }
3565
3566 /* this is needed for ASCII cp to Unicode converts */
3567 if (volume_info->iocharset == NULL) {
3568 /* load_nls_default cannot return null */
3569 volume_info->local_nls = load_nls_default();
3570 } else {
3571 volume_info->local_nls = load_nls(volume_info->iocharset);
3572 if (volume_info->local_nls == NULL) {
3573 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3574 volume_info->iocharset);
3575 return -ELIBACC;
3576 }
3577 }
3578
3579 return rc;
3580}
3581
3582struct smb_vol *
3583cifs_get_volume_info(char *mount_data, const char *devname)
3584{
3585 int rc;
3586 struct smb_vol *volume_info;
3587
3588 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3589 if (!volume_info)
3590 return ERR_PTR(-ENOMEM);
3591
3592 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3593 if (rc) {
3594 cifs_cleanup_volume_info(volume_info);
3595 volume_info = ERR_PTR(rc);
3596 }
3597
3598 return volume_info;
3599}
3600
3601static int
3602cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3603 unsigned int xid,
3604 struct cifs_tcon *tcon,
3605 struct cifs_sb_info *cifs_sb,
3606 char *full_path)
3607{
3608 int rc;
3609 char *s;
3610 char sep, tmp;
3611
3612 sep = CIFS_DIR_SEP(cifs_sb);
3613 s = full_path;
3614
3615 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3616 while (rc == 0) {
3617 /* skip separators */
3618 while (*s == sep)
3619 s++;
3620 if (!*s)
3621 break;
3622 /* next separator */
3623 while (*s && *s != sep)
3624 s++;
3625
3626 /*
3627 * temporarily null-terminate the path at the end of
3628 * the current component
3629 */
3630 tmp = *s;
3631 *s = 0;
3632 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3633 full_path);
3634 *s = tmp;
3635 }
3636 return rc;
3637}
3638
3639int
3640cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3641{
3642 int rc;
3643 unsigned int xid;
3644 struct cifs_ses *ses;
3645 struct cifs_tcon *tcon;
3646 struct TCP_Server_Info *server;
3647 char *full_path;
3648 struct tcon_link *tlink;
3649#ifdef CONFIG_CIFS_DFS_UPCALL
3650 int referral_walks_count = 0;
3651#endif
3652
3653 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3654 if (rc)
3655 return rc;
3656
3657#ifdef CONFIG_CIFS_DFS_UPCALL
3658try_mount_again:
3659 /* cleanup activities if we're chasing a referral */
3660 if (referral_walks_count) {
3661 if (tcon)
3662 cifs_put_tcon(tcon);
3663 else if (ses)
3664 cifs_put_smb_ses(ses);
3665
3666 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3667
3668 free_xid(xid);
3669 }
3670#endif
3671 rc = 0;
3672 tcon = NULL;
3673 ses = NULL;
3674 server = NULL;
3675 full_path = NULL;
3676 tlink = NULL;
3677
3678 xid = get_xid();
3679
3680 /* get a reference to a tcp session */
3681 server = cifs_get_tcp_session(volume_info);
3682 if (IS_ERR(server)) {
3683 rc = PTR_ERR(server);
3684 bdi_destroy(&cifs_sb->bdi);
3685 goto out;
3686 }
3687 if ((volume_info->max_credits < 20) ||
3688 (volume_info->max_credits > 60000))
3689 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3690 else
3691 server->max_credits = volume_info->max_credits;
3692 /* get a reference to a SMB session */
3693 ses = cifs_get_smb_ses(server, volume_info);
3694 if (IS_ERR(ses)) {
3695 rc = PTR_ERR(ses);
3696 ses = NULL;
3697 goto mount_fail_check;
3698 }
3699
3700#ifdef CONFIG_CIFS_SMB2
3701 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3702 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3703 cifs_dbg(VFS, "persistent handles not supported by server\n");
3704 rc = -EOPNOTSUPP;
3705 goto mount_fail_check;
3706 }
3707#endif /* CONFIG_CIFS_SMB2*/
3708
3709 /* search for existing tcon to this server share */
3710 tcon = cifs_get_tcon(ses, volume_info);
3711 if (IS_ERR(tcon)) {
3712 rc = PTR_ERR(tcon);
3713 tcon = NULL;
3714 goto remote_path_check;
3715 }
3716
3717 /* tell server which Unix caps we support */
3718 if (cap_unix(tcon->ses)) {
3719 /* reset of caps checks mount to see if unix extensions
3720 disabled for just this mount */
3721 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3722 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3723 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3724 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3725 rc = -EACCES;
3726 goto mount_fail_check;
3727 }
3728 } else
3729 tcon->unix_ext = 0; /* server does not support them */
3730
3731 /* do not care if a following call succeed - informational */
3732 if (!tcon->ipc && server->ops->qfs_tcon)
3733 server->ops->qfs_tcon(xid, tcon);
3734
3735 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3736 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3737
3738 /* tune readahead according to rsize */
3739 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
3740
3741remote_path_check:
3742#ifdef CONFIG_CIFS_DFS_UPCALL
3743 /*
3744 * Perform an unconditional check for whether there are DFS
3745 * referrals for this path without prefix, to provide support
3746 * for DFS referrals from w2k8 servers which don't seem to respond
3747 * with PATH_NOT_COVERED to requests that include the prefix.
3748 * Chase the referral if found, otherwise continue normally.
3749 */
3750 if (referral_walks_count == 0) {
3751 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3752 false);
3753 if (!refrc) {
3754 referral_walks_count++;
3755 goto try_mount_again;
3756 }
3757 }
3758#endif
3759
3760 /* check if a whole path is not remote */
3761 if (!rc && tcon) {
3762 if (!server->ops->is_path_accessible) {
3763 rc = -ENOSYS;
3764 goto mount_fail_check;
3765 }
3766 /*
3767 * cifs_build_path_to_root works only when we have a valid tcon
3768 */
3769 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3770 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3771 if (full_path == NULL) {
3772 rc = -ENOMEM;
3773 goto mount_fail_check;
3774 }
3775 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3776 full_path);
3777 if (rc != 0 && rc != -EREMOTE) {
3778 kfree(full_path);
3779 goto mount_fail_check;
3780 }
3781
3782 if (rc != -EREMOTE) {
3783 rc = cifs_are_all_path_components_accessible(server,
3784 xid, tcon, cifs_sb,
3785 full_path);
3786 if (rc != 0) {
3787 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3788 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3789 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3790 rc = 0;
3791 }
3792 }
3793 kfree(full_path);
3794 }
3795
3796 /* get referral if needed */
3797 if (rc == -EREMOTE) {
3798#ifdef CONFIG_CIFS_DFS_UPCALL
3799 if (referral_walks_count > MAX_NESTED_LINKS) {
3800 /*
3801 * BB: when we implement proper loop detection,
3802 * we will remove this check. But now we need it
3803 * to prevent an indefinite loop if 'DFS tree' is
3804 * misconfigured (i.e. has loops).
3805 */
3806 rc = -ELOOP;
3807 goto mount_fail_check;
3808 }
3809
3810 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3811
3812 if (!rc) {
3813 referral_walks_count++;
3814 goto try_mount_again;
3815 }
3816 goto mount_fail_check;
3817#else /* No DFS support, return error on mount */
3818 rc = -EOPNOTSUPP;
3819#endif
3820 }
3821
3822 if (rc)
3823 goto mount_fail_check;
3824
3825 /* now, hang the tcon off of the superblock */
3826 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3827 if (tlink == NULL) {
3828 rc = -ENOMEM;
3829 goto mount_fail_check;
3830 }
3831
3832 tlink->tl_uid = ses->linux_uid;
3833 tlink->tl_tcon = tcon;
3834 tlink->tl_time = jiffies;
3835 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3836 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3837
3838 cifs_sb->master_tlink = tlink;
3839 spin_lock(&cifs_sb->tlink_tree_lock);
3840 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3841 spin_unlock(&cifs_sb->tlink_tree_lock);
3842
3843 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3844 TLINK_IDLE_EXPIRE);
3845
3846mount_fail_check:
3847 /* on error free sesinfo and tcon struct if needed */
3848 if (rc) {
3849 /* If find_unc succeeded then rc == 0 so we can not end */
3850 /* up accidentally freeing someone elses tcon struct */
3851 if (tcon)
3852 cifs_put_tcon(tcon);
3853 else if (ses)
3854 cifs_put_smb_ses(ses);
3855 else
3856 cifs_put_tcp_session(server, 0);
3857 bdi_destroy(&cifs_sb->bdi);
3858 }
3859
3860out:
3861 free_xid(xid);
3862 return rc;
3863}
3864
3865/*
3866 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3867 * pointer may be NULL.
3868 */
3869int
3870CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3871 const char *tree, struct cifs_tcon *tcon,
3872 const struct nls_table *nls_codepage)
3873{
3874 struct smb_hdr *smb_buffer;
3875 struct smb_hdr *smb_buffer_response;
3876 TCONX_REQ *pSMB;
3877 TCONX_RSP *pSMBr;
3878 unsigned char *bcc_ptr;
3879 int rc = 0;
3880 int length;
3881 __u16 bytes_left, count;
3882
3883 if (ses == NULL)
3884 return -EIO;
3885
3886 smb_buffer = cifs_buf_get();
3887 if (smb_buffer == NULL)
3888 return -ENOMEM;
3889
3890 smb_buffer_response = smb_buffer;
3891
3892 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3893 NULL /*no tid */ , 4 /*wct */ );
3894
3895 smb_buffer->Mid = get_next_mid(ses->server);
3896 smb_buffer->Uid = ses->Suid;
3897 pSMB = (TCONX_REQ *) smb_buffer;
3898 pSMBr = (TCONX_RSP *) smb_buffer_response;
3899
3900 pSMB->AndXCommand = 0xFF;
3901 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3902 bcc_ptr = &pSMB->Password[0];
3903 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3904 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3905 *bcc_ptr = 0; /* password is null byte */
3906 bcc_ptr++; /* skip password */
3907 /* already aligned so no need to do it below */
3908 } else {
3909 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3910 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3911 specified as required (when that support is added to
3912 the vfs in the future) as only NTLM or the much
3913 weaker LANMAN (which we do not send by default) is accepted
3914 by Samba (not sure whether other servers allow
3915 NTLMv2 password here) */
3916#ifdef CONFIG_CIFS_WEAK_PW_HASH
3917 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3918 (ses->sectype == LANMAN))
3919 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3920 ses->server->sec_mode &
3921 SECMODE_PW_ENCRYPT ? true : false,
3922 bcc_ptr);
3923 else
3924#endif /* CIFS_WEAK_PW_HASH */
3925 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3926 bcc_ptr, nls_codepage);
3927 if (rc) {
3928 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3929 __func__, rc);
3930 cifs_buf_release(smb_buffer);
3931 return rc;
3932 }
3933
3934 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3935 if (ses->capabilities & CAP_UNICODE) {
3936 /* must align unicode strings */
3937 *bcc_ptr = 0; /* null byte password */
3938 bcc_ptr++;
3939 }
3940 }
3941
3942 if (ses->server->sign)
3943 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3944
3945 if (ses->capabilities & CAP_STATUS32) {
3946 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3947 }
3948 if (ses->capabilities & CAP_DFS) {
3949 smb_buffer->Flags2 |= SMBFLG2_DFS;
3950 }
3951 if (ses->capabilities & CAP_UNICODE) {
3952 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3953 length =
3954 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3955 6 /* max utf8 char length in bytes */ *
3956 (/* server len*/ + 256 /* share len */), nls_codepage);
3957 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3958 bcc_ptr += 2; /* skip trailing null */
3959 } else { /* ASCII */
3960 strcpy(bcc_ptr, tree);
3961 bcc_ptr += strlen(tree) + 1;
3962 }
3963 strcpy(bcc_ptr, "?????");
3964 bcc_ptr += strlen("?????");
3965 bcc_ptr += 1;
3966 count = bcc_ptr - &pSMB->Password[0];
3967 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3968 pSMB->hdr.smb_buf_length) + count);
3969 pSMB->ByteCount = cpu_to_le16(count);
3970
3971 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3972 0);
3973
3974 /* above now done in SendReceive */
3975 if ((rc == 0) && (tcon != NULL)) {
3976 bool is_unicode;
3977
3978 tcon->tidStatus = CifsGood;
3979 tcon->need_reconnect = false;
3980 tcon->tid = smb_buffer_response->Tid;
3981 bcc_ptr = pByteArea(smb_buffer_response);
3982 bytes_left = get_bcc(smb_buffer_response);
3983 length = strnlen(bcc_ptr, bytes_left - 2);
3984 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3985 is_unicode = true;
3986 else
3987 is_unicode = false;
3988
3989
3990 /* skip service field (NB: this field is always ASCII) */
3991 if (length == 3) {
3992 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3993 (bcc_ptr[2] == 'C')) {
3994 cifs_dbg(FYI, "IPC connection\n");
3995 tcon->ipc = 1;
3996 }
3997 } else if (length == 2) {
3998 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3999 /* the most common case */
4000 cifs_dbg(FYI, "disk share connection\n");
4001 }
4002 }
4003 bcc_ptr += length + 1;
4004 bytes_left -= (length + 1);
4005 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4006
4007 /* mostly informational -- no need to fail on error here */
4008 kfree(tcon->nativeFileSystem);
4009 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4010 bytes_left, is_unicode,
4011 nls_codepage);
4012
4013 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4014
4015 if ((smb_buffer_response->WordCount == 3) ||
4016 (smb_buffer_response->WordCount == 7))
4017 /* field is in same location */
4018 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4019 else
4020 tcon->Flags = 0;
4021 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4022 } else if ((rc == 0) && tcon == NULL) {
4023 /* all we need to save for IPC$ connection */
4024 ses->ipc_tid = smb_buffer_response->Tid;
4025 }
4026
4027 cifs_buf_release(smb_buffer);
4028 return rc;
4029}
4030
4031static void delayed_free(struct rcu_head *p)
4032{
4033 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4034 unload_nls(sbi->local_nls);
4035 kfree(sbi);
4036}
4037
4038void
4039cifs_umount(struct cifs_sb_info *cifs_sb)
4040{
4041 struct rb_root *root = &cifs_sb->tlink_tree;
4042 struct rb_node *node;
4043 struct tcon_link *tlink;
4044
4045 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4046
4047 spin_lock(&cifs_sb->tlink_tree_lock);
4048 while ((node = rb_first(root))) {
4049 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4050 cifs_get_tlink(tlink);
4051 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4052 rb_erase(node, root);
4053
4054 spin_unlock(&cifs_sb->tlink_tree_lock);
4055 cifs_put_tlink(tlink);
4056 spin_lock(&cifs_sb->tlink_tree_lock);
4057 }
4058 spin_unlock(&cifs_sb->tlink_tree_lock);
4059
4060 bdi_destroy(&cifs_sb->bdi);
4061 kfree(cifs_sb->mountdata);
4062 kfree(cifs_sb->prepath);
4063 call_rcu(&cifs_sb->rcu, delayed_free);
4064}
4065
4066int
4067cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4068{
4069 int rc = 0;
4070 struct TCP_Server_Info *server = ses->server;
4071
4072 if (!server->ops->need_neg || !server->ops->negotiate)
4073 return -ENOSYS;
4074
4075 /* only send once per connect */
4076 if (!server->ops->need_neg(server))
4077 return 0;
4078
4079 set_credits(server, 1);
4080
4081 rc = server->ops->negotiate(xid, ses);
4082 if (rc == 0) {
4083 spin_lock(&GlobalMid_Lock);
4084 if (server->tcpStatus == CifsNeedNegotiate)
4085 server->tcpStatus = CifsGood;
4086 else
4087 rc = -EHOSTDOWN;
4088 spin_unlock(&GlobalMid_Lock);
4089 }
4090
4091 return rc;
4092}
4093
4094int
4095cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4096 struct nls_table *nls_info)
4097{
4098 int rc = -ENOSYS;
4099 struct TCP_Server_Info *server = ses->server;
4100
4101 ses->capabilities = server->capabilities;
4102 if (linuxExtEnabled == 0)
4103 ses->capabilities &= (~server->vals->cap_unix);
4104
4105 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4106 server->sec_mode, server->capabilities, server->timeAdj);
4107
4108 if (server->ops->sess_setup)
4109 rc = server->ops->sess_setup(xid, ses, nls_info);
4110
4111 if (rc)
4112 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4113
4114 return rc;
4115}
4116
4117static int
4118cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4119{
4120 vol->sectype = ses->sectype;
4121
4122 /* krb5 is special, since we don't need username or pw */
4123 if (vol->sectype == Kerberos)
4124 return 0;
4125
4126 return cifs_set_cifscreds(vol, ses);
4127}
4128
4129static struct cifs_tcon *
4130cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4131{
4132 int rc;
4133 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4134 struct cifs_ses *ses;
4135 struct cifs_tcon *tcon = NULL;
4136 struct smb_vol *vol_info;
4137
4138 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4139 if (vol_info == NULL)
4140 return ERR_PTR(-ENOMEM);
4141
4142 vol_info->local_nls = cifs_sb->local_nls;
4143 vol_info->linux_uid = fsuid;
4144 vol_info->cred_uid = fsuid;
4145 vol_info->UNC = master_tcon->treeName;
4146 vol_info->retry = master_tcon->retry;
4147 vol_info->nocase = master_tcon->nocase;
4148 vol_info->local_lease = master_tcon->local_lease;
4149 vol_info->no_linux_ext = !master_tcon->unix_ext;
4150 vol_info->sectype = master_tcon->ses->sectype;
4151 vol_info->sign = master_tcon->ses->sign;
4152
4153 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4154 if (rc) {
4155 tcon = ERR_PTR(rc);
4156 goto out;
4157 }
4158
4159 /* get a reference for the same TCP session */
4160 spin_lock(&cifs_tcp_ses_lock);
4161 ++master_tcon->ses->server->srv_count;
4162 spin_unlock(&cifs_tcp_ses_lock);
4163
4164 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4165 if (IS_ERR(ses)) {
4166 tcon = (struct cifs_tcon *)ses;
4167 cifs_put_tcp_session(master_tcon->ses->server, 0);
4168 goto out;
4169 }
4170
4171 tcon = cifs_get_tcon(ses, vol_info);
4172 if (IS_ERR(tcon)) {
4173 cifs_put_smb_ses(ses);
4174 goto out;
4175 }
4176
4177 if (cap_unix(ses))
4178 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4179out:
4180 kfree(vol_info->username);
4181 kfree(vol_info->password);
4182 kfree(vol_info);
4183
4184 return tcon;
4185}
4186
4187struct cifs_tcon *
4188cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4189{
4190 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4191}
4192
4193/* find and return a tlink with given uid */
4194static struct tcon_link *
4195tlink_rb_search(struct rb_root *root, kuid_t uid)
4196{
4197 struct rb_node *node = root->rb_node;
4198 struct tcon_link *tlink;
4199
4200 while (node) {
4201 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4202
4203 if (uid_gt(tlink->tl_uid, uid))
4204 node = node->rb_left;
4205 else if (uid_lt(tlink->tl_uid, uid))
4206 node = node->rb_right;
4207 else
4208 return tlink;
4209 }
4210 return NULL;
4211}
4212
4213/* insert a tcon_link into the tree */
4214static void
4215tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4216{
4217 struct rb_node **new = &(root->rb_node), *parent = NULL;
4218 struct tcon_link *tlink;
4219
4220 while (*new) {
4221 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4222 parent = *new;
4223
4224 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4225 new = &((*new)->rb_left);
4226 else
4227 new = &((*new)->rb_right);
4228 }
4229
4230 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4231 rb_insert_color(&new_tlink->tl_rbnode, root);
4232}
4233
4234/*
4235 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4236 * current task.
4237 *
4238 * If the superblock doesn't refer to a multiuser mount, then just return
4239 * the master tcon for the mount.
4240 *
4241 * First, search the rbtree for an existing tcon for this fsuid. If one
4242 * exists, then check to see if it's pending construction. If it is then wait
4243 * for construction to complete. Once it's no longer pending, check to see if
4244 * it failed and either return an error or retry construction, depending on
4245 * the timeout.
4246 *
4247 * If one doesn't exist then insert a new tcon_link struct into the tree and
4248 * try to construct a new one.
4249 */
4250struct tcon_link *
4251cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4252{
4253 int ret;
4254 kuid_t fsuid = current_fsuid();
4255 struct tcon_link *tlink, *newtlink;
4256
4257 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4258 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4259
4260 spin_lock(&cifs_sb->tlink_tree_lock);
4261 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4262 if (tlink)
4263 cifs_get_tlink(tlink);
4264 spin_unlock(&cifs_sb->tlink_tree_lock);
4265
4266 if (tlink == NULL) {
4267 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4268 if (newtlink == NULL)
4269 return ERR_PTR(-ENOMEM);
4270 newtlink->tl_uid = fsuid;
4271 newtlink->tl_tcon = ERR_PTR(-EACCES);
4272 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4273 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4274 cifs_get_tlink(newtlink);
4275
4276 spin_lock(&cifs_sb->tlink_tree_lock);
4277 /* was one inserted after previous search? */
4278 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4279 if (tlink) {
4280 cifs_get_tlink(tlink);
4281 spin_unlock(&cifs_sb->tlink_tree_lock);
4282 kfree(newtlink);
4283 goto wait_for_construction;
4284 }
4285 tlink = newtlink;
4286 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4287 spin_unlock(&cifs_sb->tlink_tree_lock);
4288 } else {
4289wait_for_construction:
4290 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4291 TASK_INTERRUPTIBLE);
4292 if (ret) {
4293 cifs_put_tlink(tlink);
4294 return ERR_PTR(-ERESTARTSYS);
4295 }
4296
4297 /* if it's good, return it */
4298 if (!IS_ERR(tlink->tl_tcon))
4299 return tlink;
4300
4301 /* return error if we tried this already recently */
4302 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4303 cifs_put_tlink(tlink);
4304 return ERR_PTR(-EACCES);
4305 }
4306
4307 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4308 goto wait_for_construction;
4309 }
4310
4311 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4312 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4313 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4314
4315 if (IS_ERR(tlink->tl_tcon)) {
4316 cifs_put_tlink(tlink);
4317 return ERR_PTR(-EACCES);
4318 }
4319
4320 return tlink;
4321}
4322
4323/*
4324 * periodic workqueue job that scans tcon_tree for a superblock and closes
4325 * out tcons.
4326 */
4327static void
4328cifs_prune_tlinks(struct work_struct *work)
4329{
4330 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4331 prune_tlinks.work);
4332 struct rb_root *root = &cifs_sb->tlink_tree;
4333 struct rb_node *node = rb_first(root);
4334 struct rb_node *tmp;
4335 struct tcon_link *tlink;
4336
4337 /*
4338 * Because we drop the spinlock in the loop in order to put the tlink
4339 * it's not guarded against removal of links from the tree. The only
4340 * places that remove entries from the tree are this function and
4341 * umounts. Because this function is non-reentrant and is canceled
4342 * before umount can proceed, this is safe.
4343 */
4344 spin_lock(&cifs_sb->tlink_tree_lock);
4345 node = rb_first(root);
4346 while (node != NULL) {
4347 tmp = node;
4348 node = rb_next(tmp);
4349 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4350
4351 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4352 atomic_read(&tlink->tl_count) != 0 ||
4353 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4354 continue;
4355
4356 cifs_get_tlink(tlink);
4357 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4358 rb_erase(tmp, root);
4359
4360 spin_unlock(&cifs_sb->tlink_tree_lock);
4361 cifs_put_tlink(tlink);
4362 spin_lock(&cifs_sb->tlink_tree_lock);
4363 }
4364 spin_unlock(&cifs_sb->tlink_tree_lock);
4365
4366 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4367 TLINK_IDLE_EXPIRE);
4368}