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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[mirror_ubuntu-artful-kernel.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/sched/signal.h>
25 #include <linux/list.h>
26 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/mempool.h>
32 #include <linux/delay.h>
33 #include <linux/completion.h>
34 #include <linux/kthread.h>
35 #include <linux/pagevec.h>
36 #include <linux/freezer.h>
37 #include <linux/namei.h>
38 #include <linux/uuid.h>
39 #include <linux/uaccess.h>
40 #include <asm/processor.h>
41 #include <linux/inet.h>
42 #include <linux/module.h>
43 #include <keys/user-type.h>
44 #include <net/ipv6.h>
45 #include <linux/parser.h>
46 #include <linux/bvec.h>
47
48 #include "cifspdu.h"
49 #include "cifsglob.h"
50 #include "cifsproto.h"
51 #include "cifs_unicode.h"
52 #include "cifs_debug.h"
53 #include "cifs_fs_sb.h"
54 #include "ntlmssp.h"
55 #include "nterr.h"
56 #include "rfc1002pdu.h"
57 #include "fscache.h"
58 #ifdef CONFIG_CIFS_SMB2
59 #include "smb2proto.h"
60 #endif
61
62 #define CIFS_PORT 445
63 #define RFC1001_PORT 139
64
65 extern mempool_t *cifs_req_poolp;
66
67 /* FIXME: should these be tunable? */
68 #define TLINK_ERROR_EXPIRE (1 * HZ)
69 #define TLINK_IDLE_EXPIRE (600 * HZ)
70
71 enum {
72 /* Mount options that take no arguments */
73 Opt_user_xattr, Opt_nouser_xattr,
74 Opt_forceuid, Opt_noforceuid,
75 Opt_forcegid, Opt_noforcegid,
76 Opt_noblocksend, Opt_noautotune,
77 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
78 Opt_mapposix, Opt_nomapposix,
79 Opt_mapchars, Opt_nomapchars, Opt_sfu,
80 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
81 Opt_noposixpaths, Opt_nounix,
82 Opt_nocase,
83 Opt_brl, Opt_nobrl,
84 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
85 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
86 Opt_nohard, Opt_nosoft,
87 Opt_nointr, Opt_intr,
88 Opt_nostrictsync, Opt_strictsync,
89 Opt_serverino, Opt_noserverino,
90 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
91 Opt_acl, Opt_noacl, Opt_locallease,
92 Opt_sign, Opt_seal, Opt_noac,
93 Opt_fsc, Opt_mfsymlinks,
94 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
95 Opt_persistent, Opt_nopersistent,
96 Opt_resilient, Opt_noresilient,
97 Opt_domainauto,
98
99 /* Mount options which take numeric value */
100 Opt_backupuid, Opt_backupgid, Opt_uid,
101 Opt_cruid, Opt_gid, Opt_file_mode,
102 Opt_dirmode, Opt_port,
103 Opt_rsize, Opt_wsize, Opt_actimeo,
104 Opt_echo_interval, Opt_max_credits,
105 Opt_snapshot,
106
107 /* Mount options which take string value */
108 Opt_user, Opt_pass, Opt_ip,
109 Opt_domain, Opt_srcaddr, Opt_iocharset,
110 Opt_netbiosname, Opt_servern,
111 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
112
113 /* Mount options to be ignored */
114 Opt_ignore,
115
116 /* Options which could be blank */
117 Opt_blank_pass,
118 Opt_blank_user,
119 Opt_blank_ip,
120
121 Opt_err
122 };
123
124 static const match_table_t cifs_mount_option_tokens = {
125
126 { Opt_user_xattr, "user_xattr" },
127 { Opt_nouser_xattr, "nouser_xattr" },
128 { Opt_forceuid, "forceuid" },
129 { Opt_noforceuid, "noforceuid" },
130 { Opt_forcegid, "forcegid" },
131 { Opt_noforcegid, "noforcegid" },
132 { Opt_noblocksend, "noblocksend" },
133 { Opt_noautotune, "noautotune" },
134 { Opt_hard, "hard" },
135 { Opt_soft, "soft" },
136 { Opt_perm, "perm" },
137 { Opt_noperm, "noperm" },
138 { Opt_mapchars, "mapchars" }, /* SFU style */
139 { Opt_nomapchars, "nomapchars" },
140 { Opt_mapposix, "mapposix" }, /* SFM style */
141 { Opt_nomapposix, "nomapposix" },
142 { Opt_sfu, "sfu" },
143 { Opt_nosfu, "nosfu" },
144 { Opt_nodfs, "nodfs" },
145 { Opt_posixpaths, "posixpaths" },
146 { Opt_noposixpaths, "noposixpaths" },
147 { Opt_nounix, "nounix" },
148 { Opt_nounix, "nolinux" },
149 { Opt_nocase, "nocase" },
150 { Opt_nocase, "ignorecase" },
151 { Opt_brl, "brl" },
152 { Opt_nobrl, "nobrl" },
153 { Opt_nobrl, "nolock" },
154 { Opt_forcemandatorylock, "forcemandatorylock" },
155 { Opt_forcemandatorylock, "forcemand" },
156 { Opt_setuids, "setuids" },
157 { Opt_nosetuids, "nosetuids" },
158 { Opt_setuidfromacl, "idsfromsid" },
159 { Opt_dynperm, "dynperm" },
160 { Opt_nodynperm, "nodynperm" },
161 { Opt_nohard, "nohard" },
162 { Opt_nosoft, "nosoft" },
163 { Opt_nointr, "nointr" },
164 { Opt_intr, "intr" },
165 { Opt_nostrictsync, "nostrictsync" },
166 { Opt_strictsync, "strictsync" },
167 { Opt_serverino, "serverino" },
168 { Opt_noserverino, "noserverino" },
169 { Opt_rwpidforward, "rwpidforward" },
170 { Opt_cifsacl, "cifsacl" },
171 { Opt_nocifsacl, "nocifsacl" },
172 { Opt_acl, "acl" },
173 { Opt_noacl, "noacl" },
174 { Opt_locallease, "locallease" },
175 { Opt_sign, "sign" },
176 { Opt_seal, "seal" },
177 { Opt_noac, "noac" },
178 { Opt_fsc, "fsc" },
179 { Opt_mfsymlinks, "mfsymlinks" },
180 { Opt_multiuser, "multiuser" },
181 { Opt_sloppy, "sloppy" },
182 { Opt_nosharesock, "nosharesock" },
183 { Opt_persistent, "persistenthandles"},
184 { Opt_nopersistent, "nopersistenthandles"},
185 { Opt_resilient, "resilienthandles"},
186 { Opt_noresilient, "noresilienthandles"},
187 { Opt_domainauto, "domainauto"},
188
189 { Opt_backupuid, "backupuid=%s" },
190 { Opt_backupgid, "backupgid=%s" },
191 { Opt_uid, "uid=%s" },
192 { Opt_cruid, "cruid=%s" },
193 { Opt_gid, "gid=%s" },
194 { Opt_file_mode, "file_mode=%s" },
195 { Opt_dirmode, "dirmode=%s" },
196 { Opt_dirmode, "dir_mode=%s" },
197 { Opt_port, "port=%s" },
198 { Opt_rsize, "rsize=%s" },
199 { Opt_wsize, "wsize=%s" },
200 { Opt_actimeo, "actimeo=%s" },
201 { Opt_echo_interval, "echo_interval=%s" },
202 { Opt_max_credits, "max_credits=%s" },
203 { Opt_snapshot, "snapshot=%s" },
204
205 { Opt_blank_user, "user=" },
206 { Opt_blank_user, "username=" },
207 { Opt_user, "user=%s" },
208 { Opt_user, "username=%s" },
209 { Opt_blank_pass, "pass=" },
210 { Opt_blank_pass, "password=" },
211 { Opt_pass, "pass=%s" },
212 { Opt_pass, "password=%s" },
213 { Opt_blank_ip, "ip=" },
214 { Opt_blank_ip, "addr=" },
215 { Opt_ip, "ip=%s" },
216 { Opt_ip, "addr=%s" },
217 { Opt_ignore, "unc=%s" },
218 { Opt_ignore, "target=%s" },
219 { Opt_ignore, "path=%s" },
220 { Opt_domain, "dom=%s" },
221 { Opt_domain, "domain=%s" },
222 { Opt_domain, "workgroup=%s" },
223 { Opt_srcaddr, "srcaddr=%s" },
224 { Opt_ignore, "prefixpath=%s" },
225 { Opt_iocharset, "iocharset=%s" },
226 { Opt_netbiosname, "netbiosname=%s" },
227 { Opt_servern, "servern=%s" },
228 { Opt_ver, "ver=%s" },
229 { Opt_vers, "vers=%s" },
230 { Opt_sec, "sec=%s" },
231 { Opt_cache, "cache=%s" },
232
233 { Opt_ignore, "cred" },
234 { Opt_ignore, "credentials" },
235 { Opt_ignore, "cred=%s" },
236 { Opt_ignore, "credentials=%s" },
237 { Opt_ignore, "guest" },
238 { Opt_ignore, "rw" },
239 { Opt_ignore, "ro" },
240 { Opt_ignore, "suid" },
241 { Opt_ignore, "nosuid" },
242 { Opt_ignore, "exec" },
243 { Opt_ignore, "noexec" },
244 { Opt_ignore, "nodev" },
245 { Opt_ignore, "noauto" },
246 { Opt_ignore, "dev" },
247 { Opt_ignore, "mand" },
248 { Opt_ignore, "nomand" },
249 { Opt_ignore, "_netdev" },
250
251 { Opt_err, NULL }
252 };
253
254 enum {
255 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
256 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
257 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
258 Opt_sec_ntlmv2i, Opt_sec_lanman,
259 Opt_sec_none,
260
261 Opt_sec_err
262 };
263
264 static const match_table_t cifs_secflavor_tokens = {
265 { Opt_sec_krb5, "krb5" },
266 { Opt_sec_krb5i, "krb5i" },
267 { Opt_sec_krb5p, "krb5p" },
268 { Opt_sec_ntlmsspi, "ntlmsspi" },
269 { Opt_sec_ntlmssp, "ntlmssp" },
270 { Opt_ntlm, "ntlm" },
271 { Opt_sec_ntlmi, "ntlmi" },
272 { Opt_sec_ntlmv2, "nontlm" },
273 { Opt_sec_ntlmv2, "ntlmv2" },
274 { Opt_sec_ntlmv2i, "ntlmv2i" },
275 { Opt_sec_lanman, "lanman" },
276 { Opt_sec_none, "none" },
277
278 { Opt_sec_err, NULL }
279 };
280
281 /* cache flavors */
282 enum {
283 Opt_cache_loose,
284 Opt_cache_strict,
285 Opt_cache_none,
286 Opt_cache_err
287 };
288
289 static const match_table_t cifs_cacheflavor_tokens = {
290 { Opt_cache_loose, "loose" },
291 { Opt_cache_strict, "strict" },
292 { Opt_cache_none, "none" },
293 { Opt_cache_err, NULL }
294 };
295
296 static const match_table_t cifs_smb_version_tokens = {
297 { Smb_1, SMB1_VERSION_STRING },
298 { Smb_20, SMB20_VERSION_STRING},
299 { Smb_21, SMB21_VERSION_STRING },
300 { Smb_30, SMB30_VERSION_STRING },
301 { Smb_302, SMB302_VERSION_STRING },
302 #ifdef CONFIG_CIFS_SMB311
303 { Smb_311, SMB311_VERSION_STRING },
304 { Smb_311, ALT_SMB311_VERSION_STRING },
305 #endif /* SMB311 */
306 { Smb_version_err, NULL }
307 };
308
309 static int ip_connect(struct TCP_Server_Info *server);
310 static int generic_ip_connect(struct TCP_Server_Info *server);
311 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
312 static void cifs_prune_tlinks(struct work_struct *work);
313 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
314 const char *devname);
315
316 /*
317 * cifs tcp session reconnection
318 *
319 * mark tcp session as reconnecting so temporarily locked
320 * mark all smb sessions as reconnecting for tcp session
321 * reconnect tcp session
322 * wake up waiters on reconnection? - (not needed currently)
323 */
324 int
325 cifs_reconnect(struct TCP_Server_Info *server)
326 {
327 int rc = 0;
328 struct list_head *tmp, *tmp2;
329 struct cifs_ses *ses;
330 struct cifs_tcon *tcon;
331 struct mid_q_entry *mid_entry;
332 struct list_head retry_list;
333
334 spin_lock(&GlobalMid_Lock);
335 if (server->tcpStatus == CifsExiting) {
336 /* the demux thread will exit normally
337 next time through the loop */
338 spin_unlock(&GlobalMid_Lock);
339 return rc;
340 } else
341 server->tcpStatus = CifsNeedReconnect;
342 spin_unlock(&GlobalMid_Lock);
343 server->maxBuf = 0;
344 #ifdef CONFIG_CIFS_SMB2
345 server->max_read = 0;
346 #endif
347
348 cifs_dbg(FYI, "Reconnecting tcp session\n");
349
350 /* before reconnecting the tcp session, mark the smb session (uid)
351 and the tid bad so they are not used until reconnected */
352 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
353 __func__);
354 spin_lock(&cifs_tcp_ses_lock);
355 list_for_each(tmp, &server->smb_ses_list) {
356 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
357 ses->need_reconnect = true;
358 ses->ipc_tid = 0;
359 list_for_each(tmp2, &ses->tcon_list) {
360 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
361 tcon->need_reconnect = true;
362 }
363 }
364 spin_unlock(&cifs_tcp_ses_lock);
365
366 /* do not want to be sending data on a socket we are freeing */
367 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
368 mutex_lock(&server->srv_mutex);
369 if (server->ssocket) {
370 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
371 server->ssocket->state, server->ssocket->flags);
372 kernel_sock_shutdown(server->ssocket, SHUT_WR);
373 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
374 server->ssocket->state, server->ssocket->flags);
375 sock_release(server->ssocket);
376 server->ssocket = NULL;
377 }
378 server->sequence_number = 0;
379 server->session_estab = false;
380 kfree(server->session_key.response);
381 server->session_key.response = NULL;
382 server->session_key.len = 0;
383 server->lstrp = jiffies;
384
385 /* mark submitted MIDs for retry and issue callback */
386 INIT_LIST_HEAD(&retry_list);
387 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
388 spin_lock(&GlobalMid_Lock);
389 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
390 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
391 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
392 mid_entry->mid_state = MID_RETRY_NEEDED;
393 list_move(&mid_entry->qhead, &retry_list);
394 }
395 spin_unlock(&GlobalMid_Lock);
396 mutex_unlock(&server->srv_mutex);
397
398 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
399 list_for_each_safe(tmp, tmp2, &retry_list) {
400 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
401 list_del_init(&mid_entry->qhead);
402 mid_entry->callback(mid_entry);
403 }
404
405 do {
406 try_to_freeze();
407
408 /* we should try only the port we connected to before */
409 mutex_lock(&server->srv_mutex);
410 rc = generic_ip_connect(server);
411 if (rc) {
412 cifs_dbg(FYI, "reconnect error %d\n", rc);
413 mutex_unlock(&server->srv_mutex);
414 msleep(3000);
415 } else {
416 atomic_inc(&tcpSesReconnectCount);
417 spin_lock(&GlobalMid_Lock);
418 if (server->tcpStatus != CifsExiting)
419 server->tcpStatus = CifsNeedNegotiate;
420 spin_unlock(&GlobalMid_Lock);
421 mutex_unlock(&server->srv_mutex);
422 }
423 } while (server->tcpStatus == CifsNeedReconnect);
424
425 if (server->tcpStatus == CifsNeedNegotiate)
426 mod_delayed_work(cifsiod_wq, &server->echo, 0);
427
428 return rc;
429 }
430
431 static void
432 cifs_echo_request(struct work_struct *work)
433 {
434 int rc;
435 struct TCP_Server_Info *server = container_of(work,
436 struct TCP_Server_Info, echo.work);
437 unsigned long echo_interval;
438
439 /*
440 * If we need to renegotiate, set echo interval to zero to
441 * immediately call echo service where we can renegotiate.
442 */
443 if (server->tcpStatus == CifsNeedNegotiate)
444 echo_interval = 0;
445 else
446 echo_interval = server->echo_interval;
447
448 /*
449 * We cannot send an echo if it is disabled.
450 * Also, no need to ping if we got a response recently.
451 */
452
453 if (server->tcpStatus == CifsNeedReconnect ||
454 server->tcpStatus == CifsExiting ||
455 server->tcpStatus == CifsNew ||
456 (server->ops->can_echo && !server->ops->can_echo(server)) ||
457 time_before(jiffies, server->lstrp + echo_interval - HZ))
458 goto requeue_echo;
459
460 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
461 if (rc)
462 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
463 server->hostname);
464
465 requeue_echo:
466 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
467 }
468
469 static bool
470 allocate_buffers(struct TCP_Server_Info *server)
471 {
472 if (!server->bigbuf) {
473 server->bigbuf = (char *)cifs_buf_get();
474 if (!server->bigbuf) {
475 cifs_dbg(VFS, "No memory for large SMB response\n");
476 msleep(3000);
477 /* retry will check if exiting */
478 return false;
479 }
480 } else if (server->large_buf) {
481 /* we are reusing a dirty large buf, clear its start */
482 memset(server->bigbuf, 0, HEADER_SIZE(server));
483 }
484
485 if (!server->smallbuf) {
486 server->smallbuf = (char *)cifs_small_buf_get();
487 if (!server->smallbuf) {
488 cifs_dbg(VFS, "No memory for SMB response\n");
489 msleep(1000);
490 /* retry will check if exiting */
491 return false;
492 }
493 /* beginning of smb buffer is cleared in our buf_get */
494 } else {
495 /* if existing small buf clear beginning */
496 memset(server->smallbuf, 0, HEADER_SIZE(server));
497 }
498
499 return true;
500 }
501
502 static bool
503 server_unresponsive(struct TCP_Server_Info *server)
504 {
505 /*
506 * We need to wait 2 echo intervals to make sure we handle such
507 * situations right:
508 * 1s client sends a normal SMB request
509 * 2s client gets a response
510 * 30s echo workqueue job pops, and decides we got a response recently
511 * and don't need to send another
512 * ...
513 * 65s kernel_recvmsg times out, and we see that we haven't gotten
514 * a response in >60s.
515 */
516 if (server->tcpStatus == CifsGood &&
517 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
518 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
519 server->hostname, (2 * server->echo_interval) / HZ);
520 cifs_reconnect(server);
521 wake_up(&server->response_q);
522 return true;
523 }
524
525 return false;
526 }
527
528 static int
529 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
530 {
531 int length = 0;
532 int total_read;
533
534 smb_msg->msg_control = NULL;
535 smb_msg->msg_controllen = 0;
536
537 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
538 try_to_freeze();
539
540 if (server_unresponsive(server))
541 return -ECONNABORTED;
542
543 length = sock_recvmsg(server->ssocket, smb_msg, 0);
544
545 if (server->tcpStatus == CifsExiting)
546 return -ESHUTDOWN;
547
548 if (server->tcpStatus == CifsNeedReconnect) {
549 cifs_reconnect(server);
550 return -ECONNABORTED;
551 }
552
553 if (length == -ERESTARTSYS ||
554 length == -EAGAIN ||
555 length == -EINTR) {
556 /*
557 * Minimum sleep to prevent looping, allowing socket
558 * to clear and app threads to set tcpStatus
559 * CifsNeedReconnect if server hung.
560 */
561 usleep_range(1000, 2000);
562 length = 0;
563 continue;
564 }
565
566 if (length <= 0) {
567 cifs_dbg(FYI, "Received no data or error: %d\n", length);
568 cifs_reconnect(server);
569 return -ECONNABORTED;
570 }
571 }
572 return total_read;
573 }
574
575 int
576 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
577 unsigned int to_read)
578 {
579 struct msghdr smb_msg;
580 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
581 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
582
583 return cifs_readv_from_socket(server, &smb_msg);
584 }
585
586 int
587 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
588 unsigned int to_read)
589 {
590 struct msghdr smb_msg;
591 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
592 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
593 return cifs_readv_from_socket(server, &smb_msg);
594 }
595
596 static bool
597 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
598 {
599 /*
600 * The first byte big endian of the length field,
601 * is actually not part of the length but the type
602 * with the most common, zero, as regular data.
603 */
604 switch (type) {
605 case RFC1002_SESSION_MESSAGE:
606 /* Regular SMB response */
607 return true;
608 case RFC1002_SESSION_KEEP_ALIVE:
609 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
610 break;
611 case RFC1002_POSITIVE_SESSION_RESPONSE:
612 cifs_dbg(FYI, "RFC 1002 positive session response\n");
613 break;
614 case RFC1002_NEGATIVE_SESSION_RESPONSE:
615 /*
616 * We get this from Windows 98 instead of an error on
617 * SMB negprot response.
618 */
619 cifs_dbg(FYI, "RFC 1002 negative session response\n");
620 /* give server a second to clean up */
621 msleep(1000);
622 /*
623 * Always try 445 first on reconnect since we get NACK
624 * on some if we ever connected to port 139 (the NACK
625 * is since we do not begin with RFC1001 session
626 * initialize frame).
627 */
628 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
629 cifs_reconnect(server);
630 wake_up(&server->response_q);
631 break;
632 default:
633 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
634 cifs_reconnect(server);
635 }
636
637 return false;
638 }
639
640 void
641 dequeue_mid(struct mid_q_entry *mid, bool malformed)
642 {
643 #ifdef CONFIG_CIFS_STATS2
644 mid->when_received = jiffies;
645 #endif
646 spin_lock(&GlobalMid_Lock);
647 if (!malformed)
648 mid->mid_state = MID_RESPONSE_RECEIVED;
649 else
650 mid->mid_state = MID_RESPONSE_MALFORMED;
651 list_del_init(&mid->qhead);
652 spin_unlock(&GlobalMid_Lock);
653 }
654
655 static void
656 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
657 char *buf, int malformed)
658 {
659 if (server->ops->check_trans2 &&
660 server->ops->check_trans2(mid, server, buf, malformed))
661 return;
662 mid->resp_buf = buf;
663 mid->large_buf = server->large_buf;
664 /* Was previous buf put in mpx struct for multi-rsp? */
665 if (!mid->multiRsp) {
666 /* smb buffer will be freed by user thread */
667 if (server->large_buf)
668 server->bigbuf = NULL;
669 else
670 server->smallbuf = NULL;
671 }
672 dequeue_mid(mid, malformed);
673 }
674
675 static void clean_demultiplex_info(struct TCP_Server_Info *server)
676 {
677 int length;
678
679 /* take it off the list, if it's not already */
680 spin_lock(&cifs_tcp_ses_lock);
681 list_del_init(&server->tcp_ses_list);
682 spin_unlock(&cifs_tcp_ses_lock);
683
684 spin_lock(&GlobalMid_Lock);
685 server->tcpStatus = CifsExiting;
686 spin_unlock(&GlobalMid_Lock);
687 wake_up_all(&server->response_q);
688
689 /* check if we have blocked requests that need to free */
690 spin_lock(&server->req_lock);
691 if (server->credits <= 0)
692 server->credits = 1;
693 spin_unlock(&server->req_lock);
694 /*
695 * Although there should not be any requests blocked on this queue it
696 * can not hurt to be paranoid and try to wake up requests that may
697 * haven been blocked when more than 50 at time were on the wire to the
698 * same server - they now will see the session is in exit state and get
699 * out of SendReceive.
700 */
701 wake_up_all(&server->request_q);
702 /* give those requests time to exit */
703 msleep(125);
704
705 if (server->ssocket) {
706 sock_release(server->ssocket);
707 server->ssocket = NULL;
708 }
709
710 if (!list_empty(&server->pending_mid_q)) {
711 struct list_head dispose_list;
712 struct mid_q_entry *mid_entry;
713 struct list_head *tmp, *tmp2;
714
715 INIT_LIST_HEAD(&dispose_list);
716 spin_lock(&GlobalMid_Lock);
717 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
718 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
719 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
720 mid_entry->mid_state = MID_SHUTDOWN;
721 list_move(&mid_entry->qhead, &dispose_list);
722 }
723 spin_unlock(&GlobalMid_Lock);
724
725 /* now walk dispose list and issue callbacks */
726 list_for_each_safe(tmp, tmp2, &dispose_list) {
727 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
728 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
729 list_del_init(&mid_entry->qhead);
730 mid_entry->callback(mid_entry);
731 }
732 /* 1/8th of sec is more than enough time for them to exit */
733 msleep(125);
734 }
735
736 if (!list_empty(&server->pending_mid_q)) {
737 /*
738 * mpx threads have not exited yet give them at least the smb
739 * send timeout time for long ops.
740 *
741 * Due to delays on oplock break requests, we need to wait at
742 * least 45 seconds before giving up on a request getting a
743 * response and going ahead and killing cifsd.
744 */
745 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
746 msleep(46000);
747 /*
748 * If threads still have not exited they are probably never
749 * coming home not much else we can do but free the memory.
750 */
751 }
752
753 kfree(server->hostname);
754 kfree(server);
755
756 length = atomic_dec_return(&tcpSesAllocCount);
757 if (length > 0)
758 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
759 }
760
761 static int
762 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
763 {
764 int length;
765 char *buf = server->smallbuf;
766 unsigned int pdu_length = get_rfc1002_length(buf);
767
768 /* make sure this will fit in a large buffer */
769 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
770 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
771 cifs_reconnect(server);
772 wake_up(&server->response_q);
773 return -ECONNABORTED;
774 }
775
776 /* switch to large buffer if too big for a small one */
777 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
778 server->large_buf = true;
779 memcpy(server->bigbuf, buf, server->total_read);
780 buf = server->bigbuf;
781 }
782
783 /* now read the rest */
784 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
785 pdu_length - HEADER_SIZE(server) + 1 + 4);
786 if (length < 0)
787 return length;
788 server->total_read += length;
789
790 dump_smb(buf, server->total_read);
791
792 return cifs_handle_standard(server, mid);
793 }
794
795 int
796 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
797 {
798 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
799 int length;
800
801 /*
802 * We know that we received enough to get to the MID as we
803 * checked the pdu_length earlier. Now check to see
804 * if the rest of the header is OK. We borrow the length
805 * var for the rest of the loop to avoid a new stack var.
806 *
807 * 48 bytes is enough to display the header and a little bit
808 * into the payload for debugging purposes.
809 */
810 length = server->ops->check_message(buf, server->total_read, server);
811 if (length != 0)
812 cifs_dump_mem("Bad SMB: ", buf,
813 min_t(unsigned int, server->total_read, 48));
814
815 if (server->ops->is_status_pending &&
816 server->ops->is_status_pending(buf, server, length))
817 return -1;
818
819 if (!mid)
820 return length;
821
822 handle_mid(mid, server, buf, length);
823 return 0;
824 }
825
826 static int
827 cifs_demultiplex_thread(void *p)
828 {
829 int length;
830 struct TCP_Server_Info *server = p;
831 unsigned int pdu_length;
832 char *buf = NULL;
833 struct task_struct *task_to_wake = NULL;
834 struct mid_q_entry *mid_entry;
835
836 current->flags |= PF_MEMALLOC;
837 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
838
839 length = atomic_inc_return(&tcpSesAllocCount);
840 if (length > 1)
841 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
842
843 set_freezable();
844 while (server->tcpStatus != CifsExiting) {
845 if (try_to_freeze())
846 continue;
847
848 if (!allocate_buffers(server))
849 continue;
850
851 server->large_buf = false;
852 buf = server->smallbuf;
853 pdu_length = 4; /* enough to get RFC1001 header */
854
855 length = cifs_read_from_socket(server, buf, pdu_length);
856 if (length < 0)
857 continue;
858 server->total_read = length;
859
860 /*
861 * The right amount was read from socket - 4 bytes,
862 * so we can now interpret the length field.
863 */
864 pdu_length = get_rfc1002_length(buf);
865
866 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
867 if (!is_smb_response(server, buf[0]))
868 continue;
869
870 /* make sure we have enough to get to the MID */
871 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
872 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
873 pdu_length);
874 cifs_reconnect(server);
875 wake_up(&server->response_q);
876 continue;
877 }
878
879 /* read down to the MID */
880 length = cifs_read_from_socket(server, buf + 4,
881 HEADER_SIZE(server) - 1 - 4);
882 if (length < 0)
883 continue;
884 server->total_read += length;
885
886 if (server->ops->is_transform_hdr &&
887 server->ops->receive_transform &&
888 server->ops->is_transform_hdr(buf)) {
889 length = server->ops->receive_transform(server,
890 &mid_entry);
891 } else {
892 mid_entry = server->ops->find_mid(server, buf);
893
894 if (!mid_entry || !mid_entry->receive)
895 length = standard_receive3(server, mid_entry);
896 else
897 length = mid_entry->receive(server, mid_entry);
898 }
899
900 if (length < 0)
901 continue;
902
903 if (server->large_buf)
904 buf = server->bigbuf;
905
906 server->lstrp = jiffies;
907 if (mid_entry != NULL) {
908 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
909 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
910 server->ops->handle_cancelled_mid)
911 server->ops->handle_cancelled_mid(
912 mid_entry->resp_buf,
913 server);
914
915 if (!mid_entry->multiRsp || mid_entry->multiEnd)
916 mid_entry->callback(mid_entry);
917 } else if (server->ops->is_oplock_break &&
918 server->ops->is_oplock_break(buf, server)) {
919 cifs_dbg(FYI, "Received oplock break\n");
920 } else {
921 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
922 atomic_read(&midCount));
923 cifs_dump_mem("Received Data is: ", buf,
924 HEADER_SIZE(server));
925 #ifdef CONFIG_CIFS_DEBUG2
926 if (server->ops->dump_detail)
927 server->ops->dump_detail(buf);
928 cifs_dump_mids(server);
929 #endif /* CIFS_DEBUG2 */
930
931 }
932 } /* end while !EXITING */
933
934 /* buffer usually freed in free_mid - need to free it here on exit */
935 cifs_buf_release(server->bigbuf);
936 if (server->smallbuf) /* no sense logging a debug message if NULL */
937 cifs_small_buf_release(server->smallbuf);
938
939 task_to_wake = xchg(&server->tsk, NULL);
940 clean_demultiplex_info(server);
941
942 /* if server->tsk was NULL then wait for a signal before exiting */
943 if (!task_to_wake) {
944 set_current_state(TASK_INTERRUPTIBLE);
945 while (!signal_pending(current)) {
946 schedule();
947 set_current_state(TASK_INTERRUPTIBLE);
948 }
949 set_current_state(TASK_RUNNING);
950 }
951
952 module_put_and_exit(0);
953 }
954
955 /* extract the host portion of the UNC string */
956 static char *
957 extract_hostname(const char *unc)
958 {
959 const char *src;
960 char *dst, *delim;
961 unsigned int len;
962
963 /* skip double chars at beginning of string */
964 /* BB: check validity of these bytes? */
965 src = unc + 2;
966
967 /* delimiter between hostname and sharename is always '\\' now */
968 delim = strchr(src, '\\');
969 if (!delim)
970 return ERR_PTR(-EINVAL);
971
972 len = delim - src;
973 dst = kmalloc((len + 1), GFP_KERNEL);
974 if (dst == NULL)
975 return ERR_PTR(-ENOMEM);
976
977 memcpy(dst, src, len);
978 dst[len] = '\0';
979
980 return dst;
981 }
982
983 static int get_option_ul(substring_t args[], unsigned long *option)
984 {
985 int rc;
986 char *string;
987
988 string = match_strdup(args);
989 if (string == NULL)
990 return -ENOMEM;
991 rc = kstrtoul(string, 0, option);
992 kfree(string);
993
994 return rc;
995 }
996
997 static int get_option_uid(substring_t args[], kuid_t *result)
998 {
999 unsigned long value;
1000 kuid_t uid;
1001 int rc;
1002
1003 rc = get_option_ul(args, &value);
1004 if (rc)
1005 return rc;
1006
1007 uid = make_kuid(current_user_ns(), value);
1008 if (!uid_valid(uid))
1009 return -EINVAL;
1010
1011 *result = uid;
1012 return 0;
1013 }
1014
1015 static int get_option_gid(substring_t args[], kgid_t *result)
1016 {
1017 unsigned long value;
1018 kgid_t gid;
1019 int rc;
1020
1021 rc = get_option_ul(args, &value);
1022 if (rc)
1023 return rc;
1024
1025 gid = make_kgid(current_user_ns(), value);
1026 if (!gid_valid(gid))
1027 return -EINVAL;
1028
1029 *result = gid;
1030 return 0;
1031 }
1032
1033 static int cifs_parse_security_flavors(char *value,
1034 struct smb_vol *vol)
1035 {
1036
1037 substring_t args[MAX_OPT_ARGS];
1038
1039 /*
1040 * With mount options, the last one should win. Reset any existing
1041 * settings back to default.
1042 */
1043 vol->sectype = Unspecified;
1044 vol->sign = false;
1045
1046 switch (match_token(value, cifs_secflavor_tokens, args)) {
1047 case Opt_sec_krb5p:
1048 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1049 return 1;
1050 case Opt_sec_krb5i:
1051 vol->sign = true;
1052 /* Fallthrough */
1053 case Opt_sec_krb5:
1054 vol->sectype = Kerberos;
1055 break;
1056 case Opt_sec_ntlmsspi:
1057 vol->sign = true;
1058 /* Fallthrough */
1059 case Opt_sec_ntlmssp:
1060 vol->sectype = RawNTLMSSP;
1061 break;
1062 case Opt_sec_ntlmi:
1063 vol->sign = true;
1064 /* Fallthrough */
1065 case Opt_ntlm:
1066 vol->sectype = NTLM;
1067 break;
1068 case Opt_sec_ntlmv2i:
1069 vol->sign = true;
1070 /* Fallthrough */
1071 case Opt_sec_ntlmv2:
1072 vol->sectype = NTLMv2;
1073 break;
1074 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1075 case Opt_sec_lanman:
1076 vol->sectype = LANMAN;
1077 break;
1078 #endif
1079 case Opt_sec_none:
1080 vol->nullauth = 1;
1081 break;
1082 default:
1083 cifs_dbg(VFS, "bad security option: %s\n", value);
1084 return 1;
1085 }
1086
1087 return 0;
1088 }
1089
1090 static int
1091 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1092 {
1093 substring_t args[MAX_OPT_ARGS];
1094
1095 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1096 case Opt_cache_loose:
1097 vol->direct_io = false;
1098 vol->strict_io = false;
1099 break;
1100 case Opt_cache_strict:
1101 vol->direct_io = false;
1102 vol->strict_io = true;
1103 break;
1104 case Opt_cache_none:
1105 vol->direct_io = true;
1106 vol->strict_io = false;
1107 break;
1108 default:
1109 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1110 return 1;
1111 }
1112 return 0;
1113 }
1114
1115 static int
1116 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1117 {
1118 substring_t args[MAX_OPT_ARGS];
1119
1120 switch (match_token(value, cifs_smb_version_tokens, args)) {
1121 case Smb_1:
1122 vol->ops = &smb1_operations;
1123 vol->vals = &smb1_values;
1124 break;
1125 #ifdef CONFIG_CIFS_SMB2
1126 case Smb_20:
1127 vol->ops = &smb20_operations;
1128 vol->vals = &smb20_values;
1129 break;
1130 case Smb_21:
1131 vol->ops = &smb21_operations;
1132 vol->vals = &smb21_values;
1133 break;
1134 case Smb_30:
1135 vol->ops = &smb30_operations;
1136 vol->vals = &smb30_values;
1137 break;
1138 case Smb_302:
1139 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1140 vol->vals = &smb302_values;
1141 break;
1142 #ifdef CONFIG_CIFS_SMB311
1143 case Smb_311:
1144 vol->ops = &smb311_operations;
1145 vol->vals = &smb311_values;
1146 break;
1147 #endif /* SMB311 */
1148 #endif
1149 default:
1150 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1151 return 1;
1152 }
1153 return 0;
1154 }
1155
1156 /*
1157 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1158 * fields with the result. Returns 0 on success and an error otherwise.
1159 */
1160 static int
1161 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1162 {
1163 char *pos;
1164 const char *delims = "/\\";
1165 size_t len;
1166
1167 /* make sure we have a valid UNC double delimiter prefix */
1168 len = strspn(devname, delims);
1169 if (len != 2)
1170 return -EINVAL;
1171
1172 /* find delimiter between host and sharename */
1173 pos = strpbrk(devname + 2, delims);
1174 if (!pos)
1175 return -EINVAL;
1176
1177 /* skip past delimiter */
1178 ++pos;
1179
1180 /* now go until next delimiter or end of string */
1181 len = strcspn(pos, delims);
1182
1183 /* move "pos" up to delimiter or NULL */
1184 pos += len;
1185 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1186 if (!vol->UNC)
1187 return -ENOMEM;
1188
1189 convert_delimiter(vol->UNC, '\\');
1190
1191 /* skip any delimiter */
1192 if (*pos == '/' || *pos == '\\')
1193 pos++;
1194
1195 /* If pos is NULL then no prepath */
1196 if (!*pos)
1197 return 0;
1198
1199 vol->prepath = kstrdup(pos, GFP_KERNEL);
1200 if (!vol->prepath)
1201 return -ENOMEM;
1202
1203 return 0;
1204 }
1205
1206 static int
1207 cifs_parse_mount_options(const char *mountdata, const char *devname,
1208 struct smb_vol *vol)
1209 {
1210 char *data, *end;
1211 char *mountdata_copy = NULL, *options;
1212 unsigned int temp_len, i, j;
1213 char separator[2];
1214 short int override_uid = -1;
1215 short int override_gid = -1;
1216 bool uid_specified = false;
1217 bool gid_specified = false;
1218 bool sloppy = false;
1219 char *invalid = NULL;
1220 char *nodename = utsname()->nodename;
1221 char *string = NULL;
1222 char *tmp_end, *value;
1223 char delim;
1224 bool got_ip = false;
1225 unsigned short port = 0;
1226 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1227
1228 separator[0] = ',';
1229 separator[1] = 0;
1230 delim = separator[0];
1231
1232 /* ensure we always start with zeroed-out smb_vol */
1233 memset(vol, 0, sizeof(*vol));
1234
1235 /*
1236 * does not have to be perfect mapping since field is
1237 * informational, only used for servers that do not support
1238 * port 445 and it can be overridden at mount time
1239 */
1240 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1241 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1242 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1243
1244 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1245 /* null target name indicates to use *SMBSERVR default called name
1246 if we end up sending RFC1001 session initialize */
1247 vol->target_rfc1001_name[0] = 0;
1248 vol->cred_uid = current_uid();
1249 vol->linux_uid = current_uid();
1250 vol->linux_gid = current_gid();
1251
1252 /*
1253 * default to SFM style remapping of seven reserved characters
1254 * unless user overrides it or we negotiate CIFS POSIX where
1255 * it is unnecessary. Can not simultaneously use more than one mapping
1256 * since then readdir could list files that open could not open
1257 */
1258 vol->remap = true;
1259
1260 /* default to only allowing write access to owner of the mount */
1261 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1262
1263 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1264 /* default is always to request posix paths. */
1265 vol->posix_paths = 1;
1266 /* default to using server inode numbers where available */
1267 vol->server_ino = 1;
1268
1269 /* default is to use strict cifs caching semantics */
1270 vol->strict_io = true;
1271
1272 vol->actimeo = CIFS_DEF_ACTIMEO;
1273
1274 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1275 vol->ops = &smb1_operations;
1276 vol->vals = &smb1_values;
1277
1278 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1279
1280 if (!mountdata)
1281 goto cifs_parse_mount_err;
1282
1283 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1284 if (!mountdata_copy)
1285 goto cifs_parse_mount_err;
1286
1287 options = mountdata_copy;
1288 end = options + strlen(options);
1289
1290 if (strncmp(options, "sep=", 4) == 0) {
1291 if (options[4] != 0) {
1292 separator[0] = options[4];
1293 options += 5;
1294 } else {
1295 cifs_dbg(FYI, "Null separator not allowed\n");
1296 }
1297 }
1298 vol->backupuid_specified = false; /* no backup intent for a user */
1299 vol->backupgid_specified = false; /* no backup intent for a group */
1300
1301 switch (cifs_parse_devname(devname, vol)) {
1302 case 0:
1303 break;
1304 case -ENOMEM:
1305 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1306 goto cifs_parse_mount_err;
1307 case -EINVAL:
1308 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1309 goto cifs_parse_mount_err;
1310 default:
1311 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1312 goto cifs_parse_mount_err;
1313 }
1314
1315 while ((data = strsep(&options, separator)) != NULL) {
1316 substring_t args[MAX_OPT_ARGS];
1317 unsigned long option;
1318 int token;
1319
1320 if (!*data)
1321 continue;
1322
1323 token = match_token(data, cifs_mount_option_tokens, args);
1324
1325 switch (token) {
1326
1327 /* Ingnore the following */
1328 case Opt_ignore:
1329 break;
1330
1331 /* Boolean values */
1332 case Opt_user_xattr:
1333 vol->no_xattr = 0;
1334 break;
1335 case Opt_nouser_xattr:
1336 vol->no_xattr = 1;
1337 break;
1338 case Opt_forceuid:
1339 override_uid = 1;
1340 break;
1341 case Opt_noforceuid:
1342 override_uid = 0;
1343 break;
1344 case Opt_forcegid:
1345 override_gid = 1;
1346 break;
1347 case Opt_noforcegid:
1348 override_gid = 0;
1349 break;
1350 case Opt_noblocksend:
1351 vol->noblocksnd = 1;
1352 break;
1353 case Opt_noautotune:
1354 vol->noautotune = 1;
1355 break;
1356 case Opt_hard:
1357 vol->retry = 1;
1358 break;
1359 case Opt_soft:
1360 vol->retry = 0;
1361 break;
1362 case Opt_perm:
1363 vol->noperm = 0;
1364 break;
1365 case Opt_noperm:
1366 vol->noperm = 1;
1367 break;
1368 case Opt_mapchars:
1369 vol->sfu_remap = true;
1370 vol->remap = false; /* disable SFM mapping */
1371 break;
1372 case Opt_nomapchars:
1373 vol->sfu_remap = false;
1374 break;
1375 case Opt_mapposix:
1376 vol->remap = true;
1377 vol->sfu_remap = false; /* disable SFU mapping */
1378 break;
1379 case Opt_nomapposix:
1380 vol->remap = false;
1381 break;
1382 case Opt_sfu:
1383 vol->sfu_emul = 1;
1384 break;
1385 case Opt_nosfu:
1386 vol->sfu_emul = 0;
1387 break;
1388 case Opt_nodfs:
1389 vol->nodfs = 1;
1390 break;
1391 case Opt_posixpaths:
1392 vol->posix_paths = 1;
1393 break;
1394 case Opt_noposixpaths:
1395 vol->posix_paths = 0;
1396 break;
1397 case Opt_nounix:
1398 vol->no_linux_ext = 1;
1399 break;
1400 case Opt_nocase:
1401 vol->nocase = 1;
1402 break;
1403 case Opt_brl:
1404 vol->nobrl = 0;
1405 break;
1406 case Opt_nobrl:
1407 vol->nobrl = 1;
1408 /*
1409 * turn off mandatory locking in mode
1410 * if remote locking is turned off since the
1411 * local vfs will do advisory
1412 */
1413 if (vol->file_mode ==
1414 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1415 vol->file_mode = S_IALLUGO;
1416 break;
1417 case Opt_forcemandatorylock:
1418 vol->mand_lock = 1;
1419 break;
1420 case Opt_setuids:
1421 vol->setuids = 1;
1422 break;
1423 case Opt_nosetuids:
1424 vol->setuids = 0;
1425 break;
1426 case Opt_setuidfromacl:
1427 vol->setuidfromacl = 1;
1428 break;
1429 case Opt_dynperm:
1430 vol->dynperm = true;
1431 break;
1432 case Opt_nodynperm:
1433 vol->dynperm = false;
1434 break;
1435 case Opt_nohard:
1436 vol->retry = 0;
1437 break;
1438 case Opt_nosoft:
1439 vol->retry = 1;
1440 break;
1441 case Opt_nointr:
1442 vol->intr = 0;
1443 break;
1444 case Opt_intr:
1445 vol->intr = 1;
1446 break;
1447 case Opt_nostrictsync:
1448 vol->nostrictsync = 1;
1449 break;
1450 case Opt_strictsync:
1451 vol->nostrictsync = 0;
1452 break;
1453 case Opt_serverino:
1454 vol->server_ino = 1;
1455 break;
1456 case Opt_noserverino:
1457 vol->server_ino = 0;
1458 break;
1459 case Opt_rwpidforward:
1460 vol->rwpidforward = 1;
1461 break;
1462 case Opt_cifsacl:
1463 vol->cifs_acl = 1;
1464 break;
1465 case Opt_nocifsacl:
1466 vol->cifs_acl = 0;
1467 break;
1468 case Opt_acl:
1469 vol->no_psx_acl = 0;
1470 break;
1471 case Opt_noacl:
1472 vol->no_psx_acl = 1;
1473 break;
1474 case Opt_locallease:
1475 vol->local_lease = 1;
1476 break;
1477 case Opt_sign:
1478 vol->sign = true;
1479 break;
1480 case Opt_seal:
1481 /* we do not do the following in secFlags because seal
1482 * is a per tree connection (mount) not a per socket
1483 * or per-smb connection option in the protocol
1484 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1485 */
1486 vol->seal = 1;
1487 break;
1488 case Opt_noac:
1489 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1490 break;
1491 case Opt_fsc:
1492 #ifndef CONFIG_CIFS_FSCACHE
1493 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1494 goto cifs_parse_mount_err;
1495 #endif
1496 vol->fsc = true;
1497 break;
1498 case Opt_mfsymlinks:
1499 vol->mfsymlinks = true;
1500 break;
1501 case Opt_multiuser:
1502 vol->multiuser = true;
1503 break;
1504 case Opt_sloppy:
1505 sloppy = true;
1506 break;
1507 case Opt_nosharesock:
1508 vol->nosharesock = true;
1509 break;
1510 case Opt_nopersistent:
1511 vol->nopersistent = true;
1512 if (vol->persistent) {
1513 cifs_dbg(VFS,
1514 "persistenthandles mount options conflict\n");
1515 goto cifs_parse_mount_err;
1516 }
1517 break;
1518 case Opt_persistent:
1519 vol->persistent = true;
1520 if ((vol->nopersistent) || (vol->resilient)) {
1521 cifs_dbg(VFS,
1522 "persistenthandles mount options conflict\n");
1523 goto cifs_parse_mount_err;
1524 }
1525 break;
1526 case Opt_resilient:
1527 vol->resilient = true;
1528 if (vol->persistent) {
1529 cifs_dbg(VFS,
1530 "persistenthandles mount options conflict\n");
1531 goto cifs_parse_mount_err;
1532 }
1533 break;
1534 case Opt_noresilient:
1535 vol->resilient = false; /* already the default */
1536 break;
1537 case Opt_domainauto:
1538 vol->domainauto = true;
1539 break;
1540
1541 /* Numeric Values */
1542 case Opt_backupuid:
1543 if (get_option_uid(args, &vol->backupuid)) {
1544 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1545 __func__);
1546 goto cifs_parse_mount_err;
1547 }
1548 vol->backupuid_specified = true;
1549 break;
1550 case Opt_backupgid:
1551 if (get_option_gid(args, &vol->backupgid)) {
1552 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1553 __func__);
1554 goto cifs_parse_mount_err;
1555 }
1556 vol->backupgid_specified = true;
1557 break;
1558 case Opt_uid:
1559 if (get_option_uid(args, &vol->linux_uid)) {
1560 cifs_dbg(VFS, "%s: Invalid uid value\n",
1561 __func__);
1562 goto cifs_parse_mount_err;
1563 }
1564 uid_specified = true;
1565 break;
1566 case Opt_cruid:
1567 if (get_option_uid(args, &vol->cred_uid)) {
1568 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1569 __func__);
1570 goto cifs_parse_mount_err;
1571 }
1572 break;
1573 case Opt_gid:
1574 if (get_option_gid(args, &vol->linux_gid)) {
1575 cifs_dbg(VFS, "%s: Invalid gid value\n",
1576 __func__);
1577 goto cifs_parse_mount_err;
1578 }
1579 gid_specified = true;
1580 break;
1581 case Opt_file_mode:
1582 if (get_option_ul(args, &option)) {
1583 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1584 __func__);
1585 goto cifs_parse_mount_err;
1586 }
1587 vol->file_mode = option;
1588 break;
1589 case Opt_dirmode:
1590 if (get_option_ul(args, &option)) {
1591 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1592 __func__);
1593 goto cifs_parse_mount_err;
1594 }
1595 vol->dir_mode = option;
1596 break;
1597 case Opt_port:
1598 if (get_option_ul(args, &option) ||
1599 option > USHRT_MAX) {
1600 cifs_dbg(VFS, "%s: Invalid port value\n",
1601 __func__);
1602 goto cifs_parse_mount_err;
1603 }
1604 port = (unsigned short)option;
1605 break;
1606 case Opt_rsize:
1607 if (get_option_ul(args, &option)) {
1608 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1609 __func__);
1610 goto cifs_parse_mount_err;
1611 }
1612 vol->rsize = option;
1613 break;
1614 case Opt_wsize:
1615 if (get_option_ul(args, &option)) {
1616 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1617 __func__);
1618 goto cifs_parse_mount_err;
1619 }
1620 vol->wsize = option;
1621 break;
1622 case Opt_actimeo:
1623 if (get_option_ul(args, &option)) {
1624 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1625 __func__);
1626 goto cifs_parse_mount_err;
1627 }
1628 vol->actimeo = HZ * option;
1629 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1630 cifs_dbg(VFS, "attribute cache timeout too large\n");
1631 goto cifs_parse_mount_err;
1632 }
1633 break;
1634 case Opt_echo_interval:
1635 if (get_option_ul(args, &option)) {
1636 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1637 __func__);
1638 goto cifs_parse_mount_err;
1639 }
1640 vol->echo_interval = option;
1641 break;
1642 case Opt_snapshot:
1643 if (get_option_ul(args, &option)) {
1644 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1645 __func__);
1646 goto cifs_parse_mount_err;
1647 }
1648 vol->snapshot_time = option;
1649 break;
1650 case Opt_max_credits:
1651 if (get_option_ul(args, &option) || (option < 20) ||
1652 (option > 60000)) {
1653 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1654 __func__);
1655 goto cifs_parse_mount_err;
1656 }
1657 vol->max_credits = option;
1658 break;
1659
1660 /* String Arguments */
1661
1662 case Opt_blank_user:
1663 /* null user, ie. anonymous authentication */
1664 vol->nullauth = 1;
1665 vol->username = NULL;
1666 break;
1667 case Opt_user:
1668 string = match_strdup(args);
1669 if (string == NULL)
1670 goto out_nomem;
1671
1672 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1673 CIFS_MAX_USERNAME_LEN) {
1674 pr_warn("CIFS: username too long\n");
1675 goto cifs_parse_mount_err;
1676 }
1677
1678 kfree(vol->username);
1679 vol->username = kstrdup(string, GFP_KERNEL);
1680 if (!vol->username)
1681 goto cifs_parse_mount_err;
1682 break;
1683 case Opt_blank_pass:
1684 /* passwords have to be handled differently
1685 * to allow the character used for deliminator
1686 * to be passed within them
1687 */
1688
1689 /*
1690 * Check if this is a case where the password
1691 * starts with a delimiter
1692 */
1693 tmp_end = strchr(data, '=');
1694 tmp_end++;
1695 if (!(tmp_end < end && tmp_end[1] == delim)) {
1696 /* No it is not. Set the password to NULL */
1697 kfree(vol->password);
1698 vol->password = NULL;
1699 break;
1700 }
1701 /* Yes it is. Drop down to Opt_pass below.*/
1702 case Opt_pass:
1703 /* Obtain the value string */
1704 value = strchr(data, '=');
1705 value++;
1706
1707 /* Set tmp_end to end of the string */
1708 tmp_end = (char *) value + strlen(value);
1709
1710 /* Check if following character is the deliminator
1711 * If yes, we have encountered a double deliminator
1712 * reset the NULL character to the deliminator
1713 */
1714 if (tmp_end < end && tmp_end[1] == delim) {
1715 tmp_end[0] = delim;
1716
1717 /* Keep iterating until we get to a single
1718 * deliminator OR the end
1719 */
1720 while ((tmp_end = strchr(tmp_end, delim))
1721 != NULL && (tmp_end[1] == delim)) {
1722 tmp_end = (char *) &tmp_end[2];
1723 }
1724
1725 /* Reset var options to point to next element */
1726 if (tmp_end) {
1727 tmp_end[0] = '\0';
1728 options = (char *) &tmp_end[1];
1729 } else
1730 /* Reached the end of the mount option
1731 * string */
1732 options = end;
1733 }
1734
1735 kfree(vol->password);
1736 /* Now build new password string */
1737 temp_len = strlen(value);
1738 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1739 if (vol->password == NULL) {
1740 pr_warn("CIFS: no memory for password\n");
1741 goto cifs_parse_mount_err;
1742 }
1743
1744 for (i = 0, j = 0; i < temp_len; i++, j++) {
1745 vol->password[j] = value[i];
1746 if ((value[i] == delim) &&
1747 value[i+1] == delim)
1748 /* skip the second deliminator */
1749 i++;
1750 }
1751 vol->password[j] = '\0';
1752 break;
1753 case Opt_blank_ip:
1754 /* FIXME: should this be an error instead? */
1755 got_ip = false;
1756 break;
1757 case Opt_ip:
1758 string = match_strdup(args);
1759 if (string == NULL)
1760 goto out_nomem;
1761
1762 if (!cifs_convert_address(dstaddr, string,
1763 strlen(string))) {
1764 pr_err("CIFS: bad ip= option (%s).\n", string);
1765 goto cifs_parse_mount_err;
1766 }
1767 got_ip = true;
1768 break;
1769 case Opt_domain:
1770 string = match_strdup(args);
1771 if (string == NULL)
1772 goto out_nomem;
1773
1774 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1775 == CIFS_MAX_DOMAINNAME_LEN) {
1776 pr_warn("CIFS: domain name too long\n");
1777 goto cifs_parse_mount_err;
1778 }
1779
1780 kfree(vol->domainname);
1781 vol->domainname = kstrdup(string, GFP_KERNEL);
1782 if (!vol->domainname) {
1783 pr_warn("CIFS: no memory for domainname\n");
1784 goto cifs_parse_mount_err;
1785 }
1786 cifs_dbg(FYI, "Domain name set\n");
1787 break;
1788 case Opt_srcaddr:
1789 string = match_strdup(args);
1790 if (string == NULL)
1791 goto out_nomem;
1792
1793 if (!cifs_convert_address(
1794 (struct sockaddr *)&vol->srcaddr,
1795 string, strlen(string))) {
1796 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1797 string);
1798 goto cifs_parse_mount_err;
1799 }
1800 break;
1801 case Opt_iocharset:
1802 string = match_strdup(args);
1803 if (string == NULL)
1804 goto out_nomem;
1805
1806 if (strnlen(string, 1024) >= 65) {
1807 pr_warn("CIFS: iocharset name too long.\n");
1808 goto cifs_parse_mount_err;
1809 }
1810
1811 if (strncasecmp(string, "default", 7) != 0) {
1812 kfree(vol->iocharset);
1813 vol->iocharset = kstrdup(string,
1814 GFP_KERNEL);
1815 if (!vol->iocharset) {
1816 pr_warn("CIFS: no memory for charset\n");
1817 goto cifs_parse_mount_err;
1818 }
1819 }
1820 /* if iocharset not set then load_nls_default
1821 * is used by caller
1822 */
1823 cifs_dbg(FYI, "iocharset set to %s\n", string);
1824 break;
1825 case Opt_netbiosname:
1826 string = match_strdup(args);
1827 if (string == NULL)
1828 goto out_nomem;
1829
1830 memset(vol->source_rfc1001_name, 0x20,
1831 RFC1001_NAME_LEN);
1832 /*
1833 * FIXME: are there cases in which a comma can
1834 * be valid in workstation netbios name (and
1835 * need special handling)?
1836 */
1837 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1838 /* don't ucase netbiosname for user */
1839 if (string[i] == 0)
1840 break;
1841 vol->source_rfc1001_name[i] = string[i];
1842 }
1843 /* The string has 16th byte zero still from
1844 * set at top of the function
1845 */
1846 if (i == RFC1001_NAME_LEN && string[i] != 0)
1847 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1848 break;
1849 case Opt_servern:
1850 /* servernetbiosname specified override *SMBSERVER */
1851 string = match_strdup(args);
1852 if (string == NULL)
1853 goto out_nomem;
1854
1855 /* last byte, type, is 0x20 for servr type */
1856 memset(vol->target_rfc1001_name, 0x20,
1857 RFC1001_NAME_LEN_WITH_NULL);
1858
1859 /* BB are there cases in which a comma can be
1860 valid in this workstation netbios name
1861 (and need special handling)? */
1862
1863 /* user or mount helper must uppercase the
1864 netbios name */
1865 for (i = 0; i < 15; i++) {
1866 if (string[i] == 0)
1867 break;
1868 vol->target_rfc1001_name[i] = string[i];
1869 }
1870 /* The string has 16th byte zero still from
1871 set at top of the function */
1872 if (i == RFC1001_NAME_LEN && string[i] != 0)
1873 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1874 break;
1875 case Opt_ver:
1876 string = match_strdup(args);
1877 if (string == NULL)
1878 goto out_nomem;
1879
1880 if (strncasecmp(string, "1", 1) == 0) {
1881 /* This is the default */
1882 break;
1883 }
1884 /* For all other value, error */
1885 pr_warn("CIFS: Invalid version specified\n");
1886 goto cifs_parse_mount_err;
1887 case Opt_vers:
1888 string = match_strdup(args);
1889 if (string == NULL)
1890 goto out_nomem;
1891
1892 if (cifs_parse_smb_version(string, vol) != 0)
1893 goto cifs_parse_mount_err;
1894 break;
1895 case Opt_sec:
1896 string = match_strdup(args);
1897 if (string == NULL)
1898 goto out_nomem;
1899
1900 if (cifs_parse_security_flavors(string, vol) != 0)
1901 goto cifs_parse_mount_err;
1902 break;
1903 case Opt_cache:
1904 string = match_strdup(args);
1905 if (string == NULL)
1906 goto out_nomem;
1907
1908 if (cifs_parse_cache_flavor(string, vol) != 0)
1909 goto cifs_parse_mount_err;
1910 break;
1911 default:
1912 /*
1913 * An option we don't recognize. Save it off for later
1914 * if we haven't already found one
1915 */
1916 if (!invalid)
1917 invalid = data;
1918 break;
1919 }
1920 /* Free up any allocated string */
1921 kfree(string);
1922 string = NULL;
1923 }
1924
1925 if (!sloppy && invalid) {
1926 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1927 goto cifs_parse_mount_err;
1928 }
1929
1930 #ifndef CONFIG_KEYS
1931 /* Muliuser mounts require CONFIG_KEYS support */
1932 if (vol->multiuser) {
1933 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1934 goto cifs_parse_mount_err;
1935 }
1936 #endif
1937 if (!vol->UNC) {
1938 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1939 goto cifs_parse_mount_err;
1940 }
1941
1942 /* make sure UNC has a share name */
1943 if (!strchr(vol->UNC + 3, '\\')) {
1944 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1945 goto cifs_parse_mount_err;
1946 }
1947
1948 if (!got_ip) {
1949 int len;
1950 const char *slash;
1951
1952 /* No ip= option specified? Try to get it from UNC */
1953 /* Use the address part of the UNC. */
1954 slash = strchr(&vol->UNC[2], '\\');
1955 len = slash - &vol->UNC[2];
1956 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
1957 pr_err("Unable to determine destination address.\n");
1958 goto cifs_parse_mount_err;
1959 }
1960 }
1961
1962 /* set the port that we got earlier */
1963 cifs_set_port(dstaddr, port);
1964
1965 if (uid_specified)
1966 vol->override_uid = override_uid;
1967 else if (override_uid == 1)
1968 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1969
1970 if (gid_specified)
1971 vol->override_gid = override_gid;
1972 else if (override_gid == 1)
1973 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1974
1975 kfree(mountdata_copy);
1976 return 0;
1977
1978 out_nomem:
1979 pr_warn("Could not allocate temporary buffer\n");
1980 cifs_parse_mount_err:
1981 kfree(string);
1982 kfree(mountdata_copy);
1983 return 1;
1984 }
1985
1986 /** Returns true if srcaddr isn't specified and rhs isn't
1987 * specified, or if srcaddr is specified and
1988 * matches the IP address of the rhs argument.
1989 */
1990 static bool
1991 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1992 {
1993 switch (srcaddr->sa_family) {
1994 case AF_UNSPEC:
1995 return (rhs->sa_family == AF_UNSPEC);
1996 case AF_INET: {
1997 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1998 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1999 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2000 }
2001 case AF_INET6: {
2002 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2003 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2004 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2005 }
2006 default:
2007 WARN_ON(1);
2008 return false; /* don't expect to be here */
2009 }
2010 }
2011
2012 /*
2013 * If no port is specified in addr structure, we try to match with 445 port
2014 * and if it fails - with 139 ports. It should be called only if address
2015 * families of server and addr are equal.
2016 */
2017 static bool
2018 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2019 {
2020 __be16 port, *sport;
2021
2022 switch (addr->sa_family) {
2023 case AF_INET:
2024 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2025 port = ((struct sockaddr_in *) addr)->sin_port;
2026 break;
2027 case AF_INET6:
2028 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2029 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2030 break;
2031 default:
2032 WARN_ON(1);
2033 return false;
2034 }
2035
2036 if (!port) {
2037 port = htons(CIFS_PORT);
2038 if (port == *sport)
2039 return true;
2040
2041 port = htons(RFC1001_PORT);
2042 }
2043
2044 return port == *sport;
2045 }
2046
2047 static bool
2048 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2049 struct sockaddr *srcaddr)
2050 {
2051 switch (addr->sa_family) {
2052 case AF_INET: {
2053 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2054 struct sockaddr_in *srv_addr4 =
2055 (struct sockaddr_in *)&server->dstaddr;
2056
2057 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2058 return false;
2059 break;
2060 }
2061 case AF_INET6: {
2062 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2063 struct sockaddr_in6 *srv_addr6 =
2064 (struct sockaddr_in6 *)&server->dstaddr;
2065
2066 if (!ipv6_addr_equal(&addr6->sin6_addr,
2067 &srv_addr6->sin6_addr))
2068 return false;
2069 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2070 return false;
2071 break;
2072 }
2073 default:
2074 WARN_ON(1);
2075 return false; /* don't expect to be here */
2076 }
2077
2078 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2079 return false;
2080
2081 return true;
2082 }
2083
2084 static bool
2085 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2086 {
2087 /*
2088 * The select_sectype function should either return the vol->sectype
2089 * that was specified, or "Unspecified" if that sectype was not
2090 * compatible with the given NEGOTIATE request.
2091 */
2092 if (server->ops->select_sectype(server, vol->sectype)
2093 == Unspecified)
2094 return false;
2095
2096 /*
2097 * Now check if signing mode is acceptable. No need to check
2098 * global_secflags at this point since if MUST_SIGN is set then
2099 * the server->sign had better be too.
2100 */
2101 if (vol->sign && !server->sign)
2102 return false;
2103
2104 return true;
2105 }
2106
2107 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2108 {
2109 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2110
2111 if (vol->nosharesock)
2112 return 0;
2113
2114 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2115 return 0;
2116
2117 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2118 return 0;
2119
2120 if (!match_address(server, addr,
2121 (struct sockaddr *)&vol->srcaddr))
2122 return 0;
2123
2124 if (!match_port(server, addr))
2125 return 0;
2126
2127 if (!match_security(server, vol))
2128 return 0;
2129
2130 if (server->echo_interval != vol->echo_interval * HZ)
2131 return 0;
2132
2133 return 1;
2134 }
2135
2136 static struct TCP_Server_Info *
2137 cifs_find_tcp_session(struct smb_vol *vol)
2138 {
2139 struct TCP_Server_Info *server;
2140
2141 spin_lock(&cifs_tcp_ses_lock);
2142 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2143 if (!match_server(server, vol))
2144 continue;
2145
2146 ++server->srv_count;
2147 spin_unlock(&cifs_tcp_ses_lock);
2148 cifs_dbg(FYI, "Existing tcp session with server found\n");
2149 return server;
2150 }
2151 spin_unlock(&cifs_tcp_ses_lock);
2152 return NULL;
2153 }
2154
2155 void
2156 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2157 {
2158 struct task_struct *task;
2159
2160 spin_lock(&cifs_tcp_ses_lock);
2161 if (--server->srv_count > 0) {
2162 spin_unlock(&cifs_tcp_ses_lock);
2163 return;
2164 }
2165
2166 put_net(cifs_net_ns(server));
2167
2168 list_del_init(&server->tcp_ses_list);
2169 spin_unlock(&cifs_tcp_ses_lock);
2170
2171 cancel_delayed_work_sync(&server->echo);
2172
2173 #ifdef CONFIG_CIFS_SMB2
2174 if (from_reconnect)
2175 /*
2176 * Avoid deadlock here: reconnect work calls
2177 * cifs_put_tcp_session() at its end. Need to be sure
2178 * that reconnect work does nothing with server pointer after
2179 * that step.
2180 */
2181 cancel_delayed_work(&server->reconnect);
2182 else
2183 cancel_delayed_work_sync(&server->reconnect);
2184 #endif
2185
2186 spin_lock(&GlobalMid_Lock);
2187 server->tcpStatus = CifsExiting;
2188 spin_unlock(&GlobalMid_Lock);
2189
2190 cifs_crypto_secmech_release(server);
2191 cifs_fscache_release_client_cookie(server);
2192
2193 kfree(server->session_key.response);
2194 server->session_key.response = NULL;
2195 server->session_key.len = 0;
2196
2197 task = xchg(&server->tsk, NULL);
2198 if (task)
2199 force_sig(SIGKILL, task);
2200 }
2201
2202 static struct TCP_Server_Info *
2203 cifs_get_tcp_session(struct smb_vol *volume_info)
2204 {
2205 struct TCP_Server_Info *tcp_ses = NULL;
2206 int rc;
2207
2208 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2209
2210 /* see if we already have a matching tcp_ses */
2211 tcp_ses = cifs_find_tcp_session(volume_info);
2212 if (tcp_ses)
2213 return tcp_ses;
2214
2215 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2216 if (!tcp_ses) {
2217 rc = -ENOMEM;
2218 goto out_err;
2219 }
2220
2221 tcp_ses->ops = volume_info->ops;
2222 tcp_ses->vals = volume_info->vals;
2223 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2224 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2225 if (IS_ERR(tcp_ses->hostname)) {
2226 rc = PTR_ERR(tcp_ses->hostname);
2227 goto out_err_crypto_release;
2228 }
2229
2230 tcp_ses->noblocksnd = volume_info->noblocksnd;
2231 tcp_ses->noautotune = volume_info->noautotune;
2232 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2233 tcp_ses->in_flight = 0;
2234 tcp_ses->credits = 1;
2235 init_waitqueue_head(&tcp_ses->response_q);
2236 init_waitqueue_head(&tcp_ses->request_q);
2237 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2238 mutex_init(&tcp_ses->srv_mutex);
2239 memcpy(tcp_ses->workstation_RFC1001_name,
2240 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2241 memcpy(tcp_ses->server_RFC1001_name,
2242 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2243 tcp_ses->session_estab = false;
2244 tcp_ses->sequence_number = 0;
2245 tcp_ses->lstrp = jiffies;
2246 spin_lock_init(&tcp_ses->req_lock);
2247 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2248 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2249 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2250 #ifdef CONFIG_CIFS_SMB2
2251 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2252 mutex_init(&tcp_ses->reconnect_mutex);
2253 #endif
2254 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2255 sizeof(tcp_ses->srcaddr));
2256 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2257 sizeof(tcp_ses->dstaddr));
2258 #ifdef CONFIG_CIFS_SMB2
2259 generate_random_uuid(tcp_ses->client_guid);
2260 #endif
2261 /*
2262 * at this point we are the only ones with the pointer
2263 * to the struct since the kernel thread not created yet
2264 * no need to spinlock this init of tcpStatus or srv_count
2265 */
2266 tcp_ses->tcpStatus = CifsNew;
2267 ++tcp_ses->srv_count;
2268
2269 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2270 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2271 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2272 else
2273 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2274
2275 rc = ip_connect(tcp_ses);
2276 if (rc < 0) {
2277 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2278 goto out_err_crypto_release;
2279 }
2280
2281 /*
2282 * since we're in a cifs function already, we know that
2283 * this will succeed. No need for try_module_get().
2284 */
2285 __module_get(THIS_MODULE);
2286 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2287 tcp_ses, "cifsd");
2288 if (IS_ERR(tcp_ses->tsk)) {
2289 rc = PTR_ERR(tcp_ses->tsk);
2290 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2291 module_put(THIS_MODULE);
2292 goto out_err_crypto_release;
2293 }
2294 tcp_ses->tcpStatus = CifsNeedNegotiate;
2295
2296 /* thread spawned, put it on the list */
2297 spin_lock(&cifs_tcp_ses_lock);
2298 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2299 spin_unlock(&cifs_tcp_ses_lock);
2300
2301 cifs_fscache_get_client_cookie(tcp_ses);
2302
2303 /* queue echo request delayed work */
2304 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2305
2306 return tcp_ses;
2307
2308 out_err_crypto_release:
2309 cifs_crypto_secmech_release(tcp_ses);
2310
2311 put_net(cifs_net_ns(tcp_ses));
2312
2313 out_err:
2314 if (tcp_ses) {
2315 if (!IS_ERR(tcp_ses->hostname))
2316 kfree(tcp_ses->hostname);
2317 if (tcp_ses->ssocket)
2318 sock_release(tcp_ses->ssocket);
2319 kfree(tcp_ses);
2320 }
2321 return ERR_PTR(rc);
2322 }
2323
2324 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2325 {
2326 if (vol->sectype != Unspecified &&
2327 vol->sectype != ses->sectype)
2328 return 0;
2329
2330 switch (ses->sectype) {
2331 case Kerberos:
2332 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2333 return 0;
2334 break;
2335 default:
2336 /* NULL username means anonymous session */
2337 if (ses->user_name == NULL) {
2338 if (!vol->nullauth)
2339 return 0;
2340 break;
2341 }
2342
2343 /* anything else takes username/password */
2344 if (strncmp(ses->user_name,
2345 vol->username ? vol->username : "",
2346 CIFS_MAX_USERNAME_LEN))
2347 return 0;
2348 if ((vol->username && strlen(vol->username) != 0) &&
2349 ses->password != NULL &&
2350 strncmp(ses->password,
2351 vol->password ? vol->password : "",
2352 CIFS_MAX_PASSWORD_LEN))
2353 return 0;
2354 }
2355 return 1;
2356 }
2357
2358 static struct cifs_ses *
2359 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2360 {
2361 struct cifs_ses *ses;
2362
2363 spin_lock(&cifs_tcp_ses_lock);
2364 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2365 if (ses->status == CifsExiting)
2366 continue;
2367 if (!match_session(ses, vol))
2368 continue;
2369 ++ses->ses_count;
2370 spin_unlock(&cifs_tcp_ses_lock);
2371 return ses;
2372 }
2373 spin_unlock(&cifs_tcp_ses_lock);
2374 return NULL;
2375 }
2376
2377 static void
2378 cifs_put_smb_ses(struct cifs_ses *ses)
2379 {
2380 unsigned int rc, xid;
2381 struct TCP_Server_Info *server = ses->server;
2382
2383 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2384
2385 spin_lock(&cifs_tcp_ses_lock);
2386 if (ses->status == CifsExiting) {
2387 spin_unlock(&cifs_tcp_ses_lock);
2388 return;
2389 }
2390 if (--ses->ses_count > 0) {
2391 spin_unlock(&cifs_tcp_ses_lock);
2392 return;
2393 }
2394 if (ses->status == CifsGood)
2395 ses->status = CifsExiting;
2396 spin_unlock(&cifs_tcp_ses_lock);
2397
2398 if (ses->status == CifsExiting && server->ops->logoff) {
2399 xid = get_xid();
2400 rc = server->ops->logoff(xid, ses);
2401 if (rc)
2402 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2403 __func__, rc);
2404 _free_xid(xid);
2405 }
2406
2407 spin_lock(&cifs_tcp_ses_lock);
2408 list_del_init(&ses->smb_ses_list);
2409 spin_unlock(&cifs_tcp_ses_lock);
2410
2411 sesInfoFree(ses);
2412 cifs_put_tcp_session(server, 0);
2413 }
2414
2415 #ifdef CONFIG_KEYS
2416
2417 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2418 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2419
2420 /* Populate username and pw fields from keyring if possible */
2421 static int
2422 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2423 {
2424 int rc = 0;
2425 const char *delim, *payload;
2426 char *desc;
2427 ssize_t len;
2428 struct key *key;
2429 struct TCP_Server_Info *server = ses->server;
2430 struct sockaddr_in *sa;
2431 struct sockaddr_in6 *sa6;
2432 const struct user_key_payload *upayload;
2433
2434 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2435 if (!desc)
2436 return -ENOMEM;
2437
2438 /* try to find an address key first */
2439 switch (server->dstaddr.ss_family) {
2440 case AF_INET:
2441 sa = (struct sockaddr_in *)&server->dstaddr;
2442 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2443 break;
2444 case AF_INET6:
2445 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2446 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2447 break;
2448 default:
2449 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2450 server->dstaddr.ss_family);
2451 rc = -EINVAL;
2452 goto out_err;
2453 }
2454
2455 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2456 key = request_key(&key_type_logon, desc, "");
2457 if (IS_ERR(key)) {
2458 if (!ses->domainName) {
2459 cifs_dbg(FYI, "domainName is NULL\n");
2460 rc = PTR_ERR(key);
2461 goto out_err;
2462 }
2463
2464 /* didn't work, try to find a domain key */
2465 sprintf(desc, "cifs:d:%s", ses->domainName);
2466 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2467 key = request_key(&key_type_logon, desc, "");
2468 if (IS_ERR(key)) {
2469 rc = PTR_ERR(key);
2470 goto out_err;
2471 }
2472 }
2473
2474 down_read(&key->sem);
2475 upayload = user_key_payload_locked(key);
2476 if (IS_ERR_OR_NULL(upayload)) {
2477 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2478 goto out_key_put;
2479 }
2480
2481 /* find first : in payload */
2482 payload = upayload->data;
2483 delim = strnchr(payload, upayload->datalen, ':');
2484 cifs_dbg(FYI, "payload=%s\n", payload);
2485 if (!delim) {
2486 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2487 upayload->datalen);
2488 rc = -EINVAL;
2489 goto out_key_put;
2490 }
2491
2492 len = delim - payload;
2493 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2494 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2495 len);
2496 rc = -EINVAL;
2497 goto out_key_put;
2498 }
2499
2500 vol->username = kstrndup(payload, len, GFP_KERNEL);
2501 if (!vol->username) {
2502 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2503 len);
2504 rc = -ENOMEM;
2505 goto out_key_put;
2506 }
2507 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2508
2509 len = key->datalen - (len + 1);
2510 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2511 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2512 rc = -EINVAL;
2513 kfree(vol->username);
2514 vol->username = NULL;
2515 goto out_key_put;
2516 }
2517
2518 ++delim;
2519 vol->password = kstrndup(delim, len, GFP_KERNEL);
2520 if (!vol->password) {
2521 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2522 len);
2523 rc = -ENOMEM;
2524 kfree(vol->username);
2525 vol->username = NULL;
2526 goto out_key_put;
2527 }
2528
2529 out_key_put:
2530 up_read(&key->sem);
2531 key_put(key);
2532 out_err:
2533 kfree(desc);
2534 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2535 return rc;
2536 }
2537 #else /* ! CONFIG_KEYS */
2538 static inline int
2539 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2540 struct cifs_ses *ses __attribute__((unused)))
2541 {
2542 return -ENOSYS;
2543 }
2544 #endif /* CONFIG_KEYS */
2545
2546 static struct cifs_ses *
2547 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2548 {
2549 int rc = -ENOMEM;
2550 unsigned int xid;
2551 struct cifs_ses *ses;
2552 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2553 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2554
2555 xid = get_xid();
2556
2557 ses = cifs_find_smb_ses(server, volume_info);
2558 if (ses) {
2559 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2560 ses->status);
2561
2562 mutex_lock(&ses->session_mutex);
2563 rc = cifs_negotiate_protocol(xid, ses);
2564 if (rc) {
2565 mutex_unlock(&ses->session_mutex);
2566 /* problem -- put our ses reference */
2567 cifs_put_smb_ses(ses);
2568 free_xid(xid);
2569 return ERR_PTR(rc);
2570 }
2571 if (ses->need_reconnect) {
2572 cifs_dbg(FYI, "Session needs reconnect\n");
2573 rc = cifs_setup_session(xid, ses,
2574 volume_info->local_nls);
2575 if (rc) {
2576 mutex_unlock(&ses->session_mutex);
2577 /* problem -- put our reference */
2578 cifs_put_smb_ses(ses);
2579 free_xid(xid);
2580 return ERR_PTR(rc);
2581 }
2582 }
2583 mutex_unlock(&ses->session_mutex);
2584
2585 /* existing SMB ses has a server reference already */
2586 cifs_put_tcp_session(server, 0);
2587 free_xid(xid);
2588 return ses;
2589 }
2590
2591 cifs_dbg(FYI, "Existing smb sess not found\n");
2592 ses = sesInfoAlloc();
2593 if (ses == NULL)
2594 goto get_ses_fail;
2595
2596 /* new SMB session uses our server ref */
2597 ses->server = server;
2598 if (server->dstaddr.ss_family == AF_INET6)
2599 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2600 else
2601 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2602
2603 if (volume_info->username) {
2604 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2605 if (!ses->user_name)
2606 goto get_ses_fail;
2607 }
2608
2609 /* volume_info->password freed at unmount */
2610 if (volume_info->password) {
2611 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2612 if (!ses->password)
2613 goto get_ses_fail;
2614 }
2615 if (volume_info->domainname) {
2616 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2617 if (!ses->domainName)
2618 goto get_ses_fail;
2619 }
2620 if (volume_info->domainauto)
2621 ses->domainAuto = volume_info->domainauto;
2622 ses->cred_uid = volume_info->cred_uid;
2623 ses->linux_uid = volume_info->linux_uid;
2624
2625 ses->sectype = volume_info->sectype;
2626 ses->sign = volume_info->sign;
2627
2628 mutex_lock(&ses->session_mutex);
2629 rc = cifs_negotiate_protocol(xid, ses);
2630 if (!rc)
2631 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2632 mutex_unlock(&ses->session_mutex);
2633 if (rc)
2634 goto get_ses_fail;
2635
2636 /* success, put it on the list */
2637 spin_lock(&cifs_tcp_ses_lock);
2638 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2639 spin_unlock(&cifs_tcp_ses_lock);
2640
2641 free_xid(xid);
2642 return ses;
2643
2644 get_ses_fail:
2645 sesInfoFree(ses);
2646 free_xid(xid);
2647 return ERR_PTR(rc);
2648 }
2649
2650 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2651 {
2652 if (tcon->tidStatus == CifsExiting)
2653 return 0;
2654 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2655 return 0;
2656 if (tcon->seal != volume_info->seal)
2657 return 0;
2658 #ifdef CONFIG_CIFS_SMB2
2659 if (tcon->snapshot_time != volume_info->snapshot_time)
2660 return 0;
2661 #endif /* CONFIG_CIFS_SMB2 */
2662 return 1;
2663 }
2664
2665 static struct cifs_tcon *
2666 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2667 {
2668 struct list_head *tmp;
2669 struct cifs_tcon *tcon;
2670
2671 spin_lock(&cifs_tcp_ses_lock);
2672 list_for_each(tmp, &ses->tcon_list) {
2673 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2674 if (!match_tcon(tcon, volume_info))
2675 continue;
2676 ++tcon->tc_count;
2677 spin_unlock(&cifs_tcp_ses_lock);
2678 return tcon;
2679 }
2680 spin_unlock(&cifs_tcp_ses_lock);
2681 return NULL;
2682 }
2683
2684 void
2685 cifs_put_tcon(struct cifs_tcon *tcon)
2686 {
2687 unsigned int xid;
2688 struct cifs_ses *ses = tcon->ses;
2689
2690 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2691 spin_lock(&cifs_tcp_ses_lock);
2692 if (--tcon->tc_count > 0) {
2693 spin_unlock(&cifs_tcp_ses_lock);
2694 return;
2695 }
2696
2697 list_del_init(&tcon->tcon_list);
2698 spin_unlock(&cifs_tcp_ses_lock);
2699
2700 xid = get_xid();
2701 if (ses->server->ops->tree_disconnect)
2702 ses->server->ops->tree_disconnect(xid, tcon);
2703 _free_xid(xid);
2704
2705 cifs_fscache_release_super_cookie(tcon);
2706 tconInfoFree(tcon);
2707 cifs_put_smb_ses(ses);
2708 }
2709
2710 static struct cifs_tcon *
2711 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2712 {
2713 int rc, xid;
2714 struct cifs_tcon *tcon;
2715
2716 tcon = cifs_find_tcon(ses, volume_info);
2717 if (tcon) {
2718 cifs_dbg(FYI, "Found match on UNC path\n");
2719 /* existing tcon already has a reference */
2720 cifs_put_smb_ses(ses);
2721 return tcon;
2722 }
2723
2724 if (!ses->server->ops->tree_connect) {
2725 rc = -ENOSYS;
2726 goto out_fail;
2727 }
2728
2729 tcon = tconInfoAlloc();
2730 if (tcon == NULL) {
2731 rc = -ENOMEM;
2732 goto out_fail;
2733 }
2734
2735 if (volume_info->snapshot_time) {
2736 #ifdef CONFIG_CIFS_SMB2
2737 if (ses->server->vals->protocol_id == 0) {
2738 cifs_dbg(VFS,
2739 "Use SMB2 or later for snapshot mount option\n");
2740 rc = -EOPNOTSUPP;
2741 goto out_fail;
2742 } else
2743 tcon->snapshot_time = volume_info->snapshot_time;
2744 #else
2745 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2746 rc = -EOPNOTSUPP;
2747 goto out_fail;
2748 #endif /* CONFIG_CIFS_SMB2 */
2749 }
2750
2751 tcon->ses = ses;
2752 if (volume_info->password) {
2753 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2754 if (!tcon->password) {
2755 rc = -ENOMEM;
2756 goto out_fail;
2757 }
2758 }
2759
2760 /*
2761 * BB Do we need to wrap session_mutex around this TCon call and Unix
2762 * SetFS as we do on SessSetup and reconnect?
2763 */
2764 xid = get_xid();
2765 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2766 volume_info->local_nls);
2767 free_xid(xid);
2768 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2769 if (rc)
2770 goto out_fail;
2771
2772 if (volume_info->nodfs) {
2773 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2774 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2775 }
2776 tcon->use_persistent = false;
2777 /* check if SMB2 or later, CIFS does not support persistent handles */
2778 if (volume_info->persistent) {
2779 if (ses->server->vals->protocol_id == 0) {
2780 cifs_dbg(VFS,
2781 "SMB3 or later required for persistent handles\n");
2782 rc = -EOPNOTSUPP;
2783 goto out_fail;
2784 #ifdef CONFIG_CIFS_SMB2
2785 } else if (ses->server->capabilities &
2786 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2787 tcon->use_persistent = true;
2788 else /* persistent handles requested but not supported */ {
2789 cifs_dbg(VFS,
2790 "Persistent handles not supported on share\n");
2791 rc = -EOPNOTSUPP;
2792 goto out_fail;
2793 #endif /* CONFIG_CIFS_SMB2 */
2794 }
2795 #ifdef CONFIG_CIFS_SMB2
2796 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2797 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2798 && (volume_info->nopersistent == false)) {
2799 cifs_dbg(FYI, "enabling persistent handles\n");
2800 tcon->use_persistent = true;
2801 #endif /* CONFIG_CIFS_SMB2 */
2802 } else if (volume_info->resilient) {
2803 if (ses->server->vals->protocol_id == 0) {
2804 cifs_dbg(VFS,
2805 "SMB2.1 or later required for resilient handles\n");
2806 rc = -EOPNOTSUPP;
2807 goto out_fail;
2808 }
2809 tcon->use_resilient = true;
2810 }
2811
2812 if (volume_info->seal) {
2813 if (ses->server->vals->protocol_id == 0) {
2814 cifs_dbg(VFS,
2815 "SMB3 or later required for encryption\n");
2816 rc = -EOPNOTSUPP;
2817 goto out_fail;
2818 #ifdef CONFIG_CIFS_SMB2
2819 } else if (tcon->ses->server->capabilities &
2820 SMB2_GLOBAL_CAP_ENCRYPTION)
2821 tcon->seal = true;
2822 else {
2823 cifs_dbg(VFS, "Encryption is not supported on share\n");
2824 rc = -EOPNOTSUPP;
2825 goto out_fail;
2826 #endif /* CONFIG_CIFS_SMB2 */
2827 }
2828 }
2829
2830 /*
2831 * We can have only one retry value for a connection to a share so for
2832 * resources mounted more than once to the same server share the last
2833 * value passed in for the retry flag is used.
2834 */
2835 tcon->retry = volume_info->retry;
2836 tcon->nocase = volume_info->nocase;
2837 tcon->local_lease = volume_info->local_lease;
2838 INIT_LIST_HEAD(&tcon->pending_opens);
2839
2840 spin_lock(&cifs_tcp_ses_lock);
2841 list_add(&tcon->tcon_list, &ses->tcon_list);
2842 spin_unlock(&cifs_tcp_ses_lock);
2843
2844 cifs_fscache_get_super_cookie(tcon);
2845
2846 return tcon;
2847
2848 out_fail:
2849 tconInfoFree(tcon);
2850 return ERR_PTR(rc);
2851 }
2852
2853 void
2854 cifs_put_tlink(struct tcon_link *tlink)
2855 {
2856 if (!tlink || IS_ERR(tlink))
2857 return;
2858
2859 if (!atomic_dec_and_test(&tlink->tl_count) ||
2860 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2861 tlink->tl_time = jiffies;
2862 return;
2863 }
2864
2865 if (!IS_ERR(tlink_tcon(tlink)))
2866 cifs_put_tcon(tlink_tcon(tlink));
2867 kfree(tlink);
2868 return;
2869 }
2870
2871 static inline struct tcon_link *
2872 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2873 {
2874 return cifs_sb->master_tlink;
2875 }
2876
2877 static int
2878 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2879 {
2880 struct cifs_sb_info *old = CIFS_SB(sb);
2881 struct cifs_sb_info *new = mnt_data->cifs_sb;
2882
2883 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2884 return 0;
2885
2886 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2887 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2888 return 0;
2889
2890 /*
2891 * We want to share sb only if we don't specify an r/wsize or
2892 * specified r/wsize is greater than or equal to existing one.
2893 */
2894 if (new->wsize && new->wsize < old->wsize)
2895 return 0;
2896
2897 if (new->rsize && new->rsize < old->rsize)
2898 return 0;
2899
2900 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2901 return 0;
2902
2903 if (old->mnt_file_mode != new->mnt_file_mode ||
2904 old->mnt_dir_mode != new->mnt_dir_mode)
2905 return 0;
2906
2907 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2908 return 0;
2909
2910 if (old->actimeo != new->actimeo)
2911 return 0;
2912
2913 return 1;
2914 }
2915
2916 static int
2917 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2918 {
2919 struct cifs_sb_info *old = CIFS_SB(sb);
2920 struct cifs_sb_info *new = mnt_data->cifs_sb;
2921 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
2922 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
2923
2924 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2925 return 1;
2926 else if (!old_set && !new_set)
2927 return 1;
2928
2929 return 0;
2930 }
2931
2932 int
2933 cifs_match_super(struct super_block *sb, void *data)
2934 {
2935 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2936 struct smb_vol *volume_info;
2937 struct cifs_sb_info *cifs_sb;
2938 struct TCP_Server_Info *tcp_srv;
2939 struct cifs_ses *ses;
2940 struct cifs_tcon *tcon;
2941 struct tcon_link *tlink;
2942 int rc = 0;
2943
2944 spin_lock(&cifs_tcp_ses_lock);
2945 cifs_sb = CIFS_SB(sb);
2946 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2947 if (IS_ERR(tlink)) {
2948 spin_unlock(&cifs_tcp_ses_lock);
2949 return rc;
2950 }
2951 tcon = tlink_tcon(tlink);
2952 ses = tcon->ses;
2953 tcp_srv = ses->server;
2954
2955 volume_info = mnt_data->vol;
2956
2957 if (!match_server(tcp_srv, volume_info) ||
2958 !match_session(ses, volume_info) ||
2959 !match_tcon(tcon, volume_info) ||
2960 !match_prepath(sb, mnt_data)) {
2961 rc = 0;
2962 goto out;
2963 }
2964
2965 rc = compare_mount_options(sb, mnt_data);
2966 out:
2967 spin_unlock(&cifs_tcp_ses_lock);
2968 cifs_put_tlink(tlink);
2969 return rc;
2970 }
2971
2972 int
2973 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2974 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2975 struct dfs_info3_param **referrals, int remap)
2976 {
2977 char *temp_unc;
2978 int rc = 0;
2979
2980 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2981 return -ENOSYS;
2982
2983 *num_referrals = 0;
2984 *referrals = NULL;
2985
2986 if (ses->ipc_tid == 0) {
2987 temp_unc = kmalloc(2 /* for slashes */ +
2988 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2989 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2990 if (temp_unc == NULL)
2991 return -ENOMEM;
2992 temp_unc[0] = '\\';
2993 temp_unc[1] = '\\';
2994 strcpy(temp_unc + 2, ses->serverName);
2995 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2996 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2997 nls_codepage);
2998 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2999 kfree(temp_unc);
3000 }
3001 if (rc == 0)
3002 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3003 referrals, num_referrals,
3004 nls_codepage, remap);
3005 /*
3006 * BB - map targetUNCs to dfs_info3 structures, here or in
3007 * ses->server->ops->get_dfs_refer.
3008 */
3009
3010 return rc;
3011 }
3012
3013 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3014 static struct lock_class_key cifs_key[2];
3015 static struct lock_class_key cifs_slock_key[2];
3016
3017 static inline void
3018 cifs_reclassify_socket4(struct socket *sock)
3019 {
3020 struct sock *sk = sock->sk;
3021 BUG_ON(!sock_allow_reclassification(sk));
3022 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3023 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3024 }
3025
3026 static inline void
3027 cifs_reclassify_socket6(struct socket *sock)
3028 {
3029 struct sock *sk = sock->sk;
3030 BUG_ON(!sock_allow_reclassification(sk));
3031 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3032 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3033 }
3034 #else
3035 static inline void
3036 cifs_reclassify_socket4(struct socket *sock)
3037 {
3038 }
3039
3040 static inline void
3041 cifs_reclassify_socket6(struct socket *sock)
3042 {
3043 }
3044 #endif
3045
3046 /* See RFC1001 section 14 on representation of Netbios names */
3047 static void rfc1002mangle(char *target, char *source, unsigned int length)
3048 {
3049 unsigned int i, j;
3050
3051 for (i = 0, j = 0; i < (length); i++) {
3052 /* mask a nibble at a time and encode */
3053 target[j] = 'A' + (0x0F & (source[i] >> 4));
3054 target[j+1] = 'A' + (0x0F & source[i]);
3055 j += 2;
3056 }
3057
3058 }
3059
3060 static int
3061 bind_socket(struct TCP_Server_Info *server)
3062 {
3063 int rc = 0;
3064 if (server->srcaddr.ss_family != AF_UNSPEC) {
3065 /* Bind to the specified local IP address */
3066 struct socket *socket = server->ssocket;
3067 rc = socket->ops->bind(socket,
3068 (struct sockaddr *) &server->srcaddr,
3069 sizeof(server->srcaddr));
3070 if (rc < 0) {
3071 struct sockaddr_in *saddr4;
3072 struct sockaddr_in6 *saddr6;
3073 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3074 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3075 if (saddr6->sin6_family == AF_INET6)
3076 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3077 &saddr6->sin6_addr, rc);
3078 else
3079 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3080 &saddr4->sin_addr.s_addr, rc);
3081 }
3082 }
3083 return rc;
3084 }
3085
3086 static int
3087 ip_rfc1001_connect(struct TCP_Server_Info *server)
3088 {
3089 int rc = 0;
3090 /*
3091 * some servers require RFC1001 sessinit before sending
3092 * negprot - BB check reconnection in case where second
3093 * sessinit is sent but no second negprot
3094 */
3095 struct rfc1002_session_packet *ses_init_buf;
3096 struct smb_hdr *smb_buf;
3097 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3098 GFP_KERNEL);
3099 if (ses_init_buf) {
3100 ses_init_buf->trailer.session_req.called_len = 32;
3101
3102 if (server->server_RFC1001_name[0] != 0)
3103 rfc1002mangle(ses_init_buf->trailer.
3104 session_req.called_name,
3105 server->server_RFC1001_name,
3106 RFC1001_NAME_LEN_WITH_NULL);
3107 else
3108 rfc1002mangle(ses_init_buf->trailer.
3109 session_req.called_name,
3110 DEFAULT_CIFS_CALLED_NAME,
3111 RFC1001_NAME_LEN_WITH_NULL);
3112
3113 ses_init_buf->trailer.session_req.calling_len = 32;
3114
3115 /*
3116 * calling name ends in null (byte 16) from old smb
3117 * convention.
3118 */
3119 if (server->workstation_RFC1001_name[0] != 0)
3120 rfc1002mangle(ses_init_buf->trailer.
3121 session_req.calling_name,
3122 server->workstation_RFC1001_name,
3123 RFC1001_NAME_LEN_WITH_NULL);
3124 else
3125 rfc1002mangle(ses_init_buf->trailer.
3126 session_req.calling_name,
3127 "LINUX_CIFS_CLNT",
3128 RFC1001_NAME_LEN_WITH_NULL);
3129
3130 ses_init_buf->trailer.session_req.scope1 = 0;
3131 ses_init_buf->trailer.session_req.scope2 = 0;
3132 smb_buf = (struct smb_hdr *)ses_init_buf;
3133
3134 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3135 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3136 rc = smb_send(server, smb_buf, 0x44);
3137 kfree(ses_init_buf);
3138 /*
3139 * RFC1001 layer in at least one server
3140 * requires very short break before negprot
3141 * presumably because not expecting negprot
3142 * to follow so fast. This is a simple
3143 * solution that works without
3144 * complicating the code and causes no
3145 * significant slowing down on mount
3146 * for everyone else
3147 */
3148 usleep_range(1000, 2000);
3149 }
3150 /*
3151 * else the negprot may still work without this
3152 * even though malloc failed
3153 */
3154
3155 return rc;
3156 }
3157
3158 static int
3159 generic_ip_connect(struct TCP_Server_Info *server)
3160 {
3161 int rc = 0;
3162 __be16 sport;
3163 int slen, sfamily;
3164 struct socket *socket = server->ssocket;
3165 struct sockaddr *saddr;
3166
3167 saddr = (struct sockaddr *) &server->dstaddr;
3168
3169 if (server->dstaddr.ss_family == AF_INET6) {
3170 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3171 slen = sizeof(struct sockaddr_in6);
3172 sfamily = AF_INET6;
3173 } else {
3174 sport = ((struct sockaddr_in *) saddr)->sin_port;
3175 slen = sizeof(struct sockaddr_in);
3176 sfamily = AF_INET;
3177 }
3178
3179 if (socket == NULL) {
3180 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3181 IPPROTO_TCP, &socket, 1);
3182 if (rc < 0) {
3183 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3184 server->ssocket = NULL;
3185 return rc;
3186 }
3187
3188 /* BB other socket options to set KEEPALIVE, NODELAY? */
3189 cifs_dbg(FYI, "Socket created\n");
3190 server->ssocket = socket;
3191 socket->sk->sk_allocation = GFP_NOFS;
3192 if (sfamily == AF_INET6)
3193 cifs_reclassify_socket6(socket);
3194 else
3195 cifs_reclassify_socket4(socket);
3196 }
3197
3198 rc = bind_socket(server);
3199 if (rc < 0)
3200 return rc;
3201
3202 /*
3203 * Eventually check for other socket options to change from
3204 * the default. sock_setsockopt not used because it expects
3205 * user space buffer
3206 */
3207 socket->sk->sk_rcvtimeo = 7 * HZ;
3208 socket->sk->sk_sndtimeo = 5 * HZ;
3209
3210 /* make the bufsizes depend on wsize/rsize and max requests */
3211 if (server->noautotune) {
3212 if (socket->sk->sk_sndbuf < (200 * 1024))
3213 socket->sk->sk_sndbuf = 200 * 1024;
3214 if (socket->sk->sk_rcvbuf < (140 * 1024))
3215 socket->sk->sk_rcvbuf = 140 * 1024;
3216 }
3217
3218 if (server->tcp_nodelay) {
3219 int val = 1;
3220 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3221 (char *)&val, sizeof(val));
3222 if (rc)
3223 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3224 rc);
3225 }
3226
3227 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3228 socket->sk->sk_sndbuf,
3229 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3230
3231 rc = socket->ops->connect(socket, saddr, slen, 0);
3232 if (rc < 0) {
3233 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3234 sock_release(socket);
3235 server->ssocket = NULL;
3236 return rc;
3237 }
3238
3239 if (sport == htons(RFC1001_PORT))
3240 rc = ip_rfc1001_connect(server);
3241
3242 return rc;
3243 }
3244
3245 static int
3246 ip_connect(struct TCP_Server_Info *server)
3247 {
3248 __be16 *sport;
3249 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3250 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3251
3252 if (server->dstaddr.ss_family == AF_INET6)
3253 sport = &addr6->sin6_port;
3254 else
3255 sport = &addr->sin_port;
3256
3257 if (*sport == 0) {
3258 int rc;
3259
3260 /* try with 445 port at first */
3261 *sport = htons(CIFS_PORT);
3262
3263 rc = generic_ip_connect(server);
3264 if (rc >= 0)
3265 return rc;
3266
3267 /* if it failed, try with 139 port */
3268 *sport = htons(RFC1001_PORT);
3269 }
3270
3271 return generic_ip_connect(server);
3272 }
3273
3274 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3275 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3276 {
3277 /* if we are reconnecting then should we check to see if
3278 * any requested capabilities changed locally e.g. via
3279 * remount but we can not do much about it here
3280 * if they have (even if we could detect it by the following)
3281 * Perhaps we could add a backpointer to array of sb from tcon
3282 * or if we change to make all sb to same share the same
3283 * sb as NFS - then we only have one backpointer to sb.
3284 * What if we wanted to mount the server share twice once with
3285 * and once without posixacls or posix paths? */
3286 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3287
3288 if (vol_info && vol_info->no_linux_ext) {
3289 tcon->fsUnixInfo.Capability = 0;
3290 tcon->unix_ext = 0; /* Unix Extensions disabled */
3291 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3292 return;
3293 } else if (vol_info)
3294 tcon->unix_ext = 1; /* Unix Extensions supported */
3295
3296 if (tcon->unix_ext == 0) {
3297 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3298 return;
3299 }
3300
3301 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3302 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3303 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3304 /* check for reconnect case in which we do not
3305 want to change the mount behavior if we can avoid it */
3306 if (vol_info == NULL) {
3307 /* turn off POSIX ACL and PATHNAMES if not set
3308 originally at mount time */
3309 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3310 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3311 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3312 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3313 cifs_dbg(VFS, "POSIXPATH support change\n");
3314 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3315 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3316 cifs_dbg(VFS, "possible reconnect error\n");
3317 cifs_dbg(VFS, "server disabled POSIX path support\n");
3318 }
3319 }
3320
3321 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3322 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3323
3324 cap &= CIFS_UNIX_CAP_MASK;
3325 if (vol_info && vol_info->no_psx_acl)
3326 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3327 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3328 cifs_dbg(FYI, "negotiated posix acl support\n");
3329 if (cifs_sb)
3330 cifs_sb->mnt_cifs_flags |=
3331 CIFS_MOUNT_POSIXACL;
3332 }
3333
3334 if (vol_info && vol_info->posix_paths == 0)
3335 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3336 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3337 cifs_dbg(FYI, "negotiate posix pathnames\n");
3338 if (cifs_sb)
3339 cifs_sb->mnt_cifs_flags |=
3340 CIFS_MOUNT_POSIX_PATHS;
3341 }
3342
3343 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3344 #ifdef CONFIG_CIFS_DEBUG2
3345 if (cap & CIFS_UNIX_FCNTL_CAP)
3346 cifs_dbg(FYI, "FCNTL cap\n");
3347 if (cap & CIFS_UNIX_EXTATTR_CAP)
3348 cifs_dbg(FYI, "EXTATTR cap\n");
3349 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3350 cifs_dbg(FYI, "POSIX path cap\n");
3351 if (cap & CIFS_UNIX_XATTR_CAP)
3352 cifs_dbg(FYI, "XATTR cap\n");
3353 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3354 cifs_dbg(FYI, "POSIX ACL cap\n");
3355 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3356 cifs_dbg(FYI, "very large read cap\n");
3357 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3358 cifs_dbg(FYI, "very large write cap\n");
3359 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3360 cifs_dbg(FYI, "transport encryption cap\n");
3361 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3362 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3363 #endif /* CIFS_DEBUG2 */
3364 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3365 if (vol_info == NULL) {
3366 cifs_dbg(FYI, "resetting capabilities failed\n");
3367 } else
3368 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");
3369
3370 }
3371 }
3372 }
3373
3374 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3375 struct cifs_sb_info *cifs_sb)
3376 {
3377 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3378
3379 spin_lock_init(&cifs_sb->tlink_tree_lock);
3380 cifs_sb->tlink_tree = RB_ROOT;
3381
3382 /*
3383 * Temporarily set r/wsize for matching superblock. If we end up using
3384 * new sb then client will later negotiate it downward if needed.
3385 */
3386 cifs_sb->rsize = pvolume_info->rsize;
3387 cifs_sb->wsize = pvolume_info->wsize;
3388
3389 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3390 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3391 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3392 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3393 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3394 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3395
3396 cifs_sb->actimeo = pvolume_info->actimeo;
3397 cifs_sb->local_nls = pvolume_info->local_nls;
3398
3399 if (pvolume_info->noperm)
3400 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3401 if (pvolume_info->setuids)
3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3403 if (pvolume_info->setuidfromacl)
3404 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3405 if (pvolume_info->server_ino)
3406 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3407 if (pvolume_info->remap)
3408 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3409 if (pvolume_info->sfu_remap)
3410 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3411 if (pvolume_info->no_xattr)
3412 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3413 if (pvolume_info->sfu_emul)
3414 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3415 if (pvolume_info->nobrl)
3416 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3417 if (pvolume_info->nostrictsync)
3418 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3419 if (pvolume_info->mand_lock)
3420 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3421 if (pvolume_info->rwpidforward)
3422 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3423 if (pvolume_info->cifs_acl)
3424 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3425 if (pvolume_info->backupuid_specified) {
3426 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3427 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3428 }
3429 if (pvolume_info->backupgid_specified) {
3430 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3431 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3432 }
3433 if (pvolume_info->override_uid)
3434 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3435 if (pvolume_info->override_gid)
3436 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3437 if (pvolume_info->dynperm)
3438 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3439 if (pvolume_info->fsc)
3440 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3441 if (pvolume_info->multiuser)
3442 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3443 CIFS_MOUNT_NO_PERM);
3444 if (pvolume_info->strict_io)
3445 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3446 if (pvolume_info->direct_io) {
3447 cifs_dbg(FYI, "mounting share using direct i/o\n");
3448 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3449 }
3450 if (pvolume_info->mfsymlinks) {
3451 if (pvolume_info->sfu_emul) {
3452 /*
3453 * Our SFU ("Services for Unix" emulation does not allow
3454 * creating symlinks but does allow reading existing SFU
3455 * symlinks (it does allow both creating and reading SFU
3456 * style mknod and FIFOs though). When "mfsymlinks" and
3457 * "sfu" are both enabled at the same time, it allows
3458 * reading both types of symlinks, but will only create
3459 * them with mfsymlinks format. This allows better
3460 * Apple compatibility (probably better for Samba too)
3461 * while still recognizing old Windows style symlinks.
3462 */
3463 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3464 }
3465 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3466 }
3467
3468 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3469 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3470
3471 if (pvolume_info->prepath) {
3472 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3473 if (cifs_sb->prepath == NULL)
3474 return -ENOMEM;
3475 }
3476
3477 return 0;
3478 }
3479
3480 static void
3481 cleanup_volume_info_contents(struct smb_vol *volume_info)
3482 {
3483 kfree(volume_info->username);
3484 kzfree(volume_info->password);
3485 kfree(volume_info->UNC);
3486 kfree(volume_info->domainname);
3487 kfree(volume_info->iocharset);
3488 kfree(volume_info->prepath);
3489 }
3490
3491 void
3492 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3493 {
3494 if (!volume_info)
3495 return;
3496 cleanup_volume_info_contents(volume_info);
3497 kfree(volume_info);
3498 }
3499
3500
3501 #ifdef CONFIG_CIFS_DFS_UPCALL
3502 /*
3503 * cifs_build_path_to_root returns full path to root when we do not have an
3504 * exiting connection (tcon)
3505 */
3506 static char *
3507 build_unc_path_to_root(const struct smb_vol *vol,
3508 const struct cifs_sb_info *cifs_sb)
3509 {
3510 char *full_path, *pos;
3511 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3512 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3513
3514 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3515 if (full_path == NULL)
3516 return ERR_PTR(-ENOMEM);
3517
3518 strncpy(full_path, vol->UNC, unc_len);
3519 pos = full_path + unc_len;
3520
3521 if (pplen) {
3522 *pos = CIFS_DIR_SEP(cifs_sb);
3523 strncpy(pos + 1, vol->prepath, pplen);
3524 pos += pplen;
3525 }
3526
3527 *pos = '\0'; /* add trailing null */
3528 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3529 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3530 return full_path;
3531 }
3532
3533 /*
3534 * Perform a dfs referral query for a share and (optionally) prefix
3535 *
3536 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3537 * to a string containing updated options for the submount. Otherwise it
3538 * will be left untouched.
3539 *
3540 * Returns the rc from get_dfs_path to the caller, which can be used to
3541 * determine whether there were referrals.
3542 */
3543 static int
3544 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3545 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3546 int check_prefix)
3547 {
3548 int rc;
3549 unsigned int num_referrals = 0;
3550 struct dfs_info3_param *referrals = NULL;
3551 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3552
3553 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3554 if (IS_ERR(full_path))
3555 return PTR_ERR(full_path);
3556
3557 /* For DFS paths, skip the first '\' of the UNC */
3558 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3559
3560 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3561 &num_referrals, &referrals, cifs_remap(cifs_sb));
3562
3563 if (!rc && num_referrals > 0) {
3564 char *fake_devname = NULL;
3565
3566 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3567 full_path + 1, referrals,
3568 &fake_devname);
3569
3570 free_dfs_info_array(referrals, num_referrals);
3571
3572 if (IS_ERR(mdata)) {
3573 rc = PTR_ERR(mdata);
3574 mdata = NULL;
3575 } else {
3576 cleanup_volume_info_contents(volume_info);
3577 rc = cifs_setup_volume_info(volume_info, mdata,
3578 fake_devname);
3579 }
3580 kfree(fake_devname);
3581 kfree(cifs_sb->mountdata);
3582 cifs_sb->mountdata = mdata;
3583 }
3584 kfree(full_path);
3585 return rc;
3586 }
3587 #endif
3588
3589 static int
3590 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3591 const char *devname)
3592 {
3593 int rc = 0;
3594
3595 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3596 return -EINVAL;
3597
3598 if (volume_info->nullauth) {
3599 cifs_dbg(FYI, "Anonymous login\n");
3600 kfree(volume_info->username);
3601 volume_info->username = NULL;
3602 } else if (volume_info->username) {
3603 /* BB fixme parse for domain name here */
3604 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3605 } else {
3606 cifs_dbg(VFS, "No username specified\n");
3607 /* In userspace mount helper we can get user name from alternate
3608 locations such as env variables and files on disk */
3609 return -EINVAL;
3610 }
3611
3612 /* this is needed for ASCII cp to Unicode converts */
3613 if (volume_info->iocharset == NULL) {
3614 /* load_nls_default cannot return null */
3615 volume_info->local_nls = load_nls_default();
3616 } else {
3617 volume_info->local_nls = load_nls(volume_info->iocharset);
3618 if (volume_info->local_nls == NULL) {
3619 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3620 volume_info->iocharset);
3621 return -ELIBACC;
3622 }
3623 }
3624
3625 return rc;
3626 }
3627
3628 struct smb_vol *
3629 cifs_get_volume_info(char *mount_data, const char *devname)
3630 {
3631 int rc;
3632 struct smb_vol *volume_info;
3633
3634 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3635 if (!volume_info)
3636 return ERR_PTR(-ENOMEM);
3637
3638 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3639 if (rc) {
3640 cifs_cleanup_volume_info(volume_info);
3641 volume_info = ERR_PTR(rc);
3642 }
3643
3644 return volume_info;
3645 }
3646
3647 static int
3648 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3649 unsigned int xid,
3650 struct cifs_tcon *tcon,
3651 struct cifs_sb_info *cifs_sb,
3652 char *full_path)
3653 {
3654 int rc;
3655 char *s;
3656 char sep, tmp;
3657
3658 sep = CIFS_DIR_SEP(cifs_sb);
3659 s = full_path;
3660
3661 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3662 while (rc == 0) {
3663 /* skip separators */
3664 while (*s == sep)
3665 s++;
3666 if (!*s)
3667 break;
3668 /* next separator */
3669 while (*s && *s != sep)
3670 s++;
3671
3672 /*
3673 * temporarily null-terminate the path at the end of
3674 * the current component
3675 */
3676 tmp = *s;
3677 *s = 0;
3678 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3679 full_path);
3680 *s = tmp;
3681 }
3682 return rc;
3683 }
3684
3685 int
3686 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3687 {
3688 int rc;
3689 unsigned int xid;
3690 struct cifs_ses *ses;
3691 struct cifs_tcon *tcon;
3692 struct TCP_Server_Info *server;
3693 char *full_path;
3694 struct tcon_link *tlink;
3695 #ifdef CONFIG_CIFS_DFS_UPCALL
3696 int referral_walks_count = 0;
3697 #endif
3698
3699 #ifdef CONFIG_CIFS_DFS_UPCALL
3700 try_mount_again:
3701 /* cleanup activities if we're chasing a referral */
3702 if (referral_walks_count) {
3703 if (tcon)
3704 cifs_put_tcon(tcon);
3705 else if (ses)
3706 cifs_put_smb_ses(ses);
3707
3708 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3709
3710 free_xid(xid);
3711 }
3712 #endif
3713 rc = 0;
3714 tcon = NULL;
3715 ses = NULL;
3716 server = NULL;
3717 full_path = NULL;
3718 tlink = NULL;
3719
3720 xid = get_xid();
3721
3722 /* get a reference to a tcp session */
3723 server = cifs_get_tcp_session(volume_info);
3724 if (IS_ERR(server)) {
3725 rc = PTR_ERR(server);
3726 goto out;
3727 }
3728 if ((volume_info->max_credits < 20) ||
3729 (volume_info->max_credits > 60000))
3730 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3731 else
3732 server->max_credits = volume_info->max_credits;
3733 /* get a reference to a SMB session */
3734 ses = cifs_get_smb_ses(server, volume_info);
3735 if (IS_ERR(ses)) {
3736 rc = PTR_ERR(ses);
3737 ses = NULL;
3738 goto mount_fail_check;
3739 }
3740
3741 #ifdef CONFIG_CIFS_SMB2
3742 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3743 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3744 cifs_dbg(VFS, "persistent handles not supported by server\n");
3745 rc = -EOPNOTSUPP;
3746 goto mount_fail_check;
3747 }
3748 #endif /* CONFIG_CIFS_SMB2*/
3749
3750 /* search for existing tcon to this server share */
3751 tcon = cifs_get_tcon(ses, volume_info);
3752 if (IS_ERR(tcon)) {
3753 rc = PTR_ERR(tcon);
3754 tcon = NULL;
3755 if (rc == -EACCES)
3756 goto mount_fail_check;
3757
3758 goto remote_path_check;
3759 }
3760
3761 /* tell server which Unix caps we support */
3762 if (cap_unix(tcon->ses)) {
3763 /* reset of caps checks mount to see if unix extensions
3764 disabled for just this mount */
3765 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3766 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3767 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3768 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3769 rc = -EACCES;
3770 goto mount_fail_check;
3771 }
3772 } else
3773 tcon->unix_ext = 0; /* server does not support them */
3774
3775 /* do not care if a following call succeed - informational */
3776 if (!tcon->ipc && server->ops->qfs_tcon)
3777 server->ops->qfs_tcon(xid, tcon);
3778
3779 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3780 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3781
3782 remote_path_check:
3783 #ifdef CONFIG_CIFS_DFS_UPCALL
3784 /*
3785 * Perform an unconditional check for whether there are DFS
3786 * referrals for this path without prefix, to provide support
3787 * for DFS referrals from w2k8 servers which don't seem to respond
3788 * with PATH_NOT_COVERED to requests that include the prefix.
3789 * Chase the referral if found, otherwise continue normally.
3790 */
3791 if (referral_walks_count == 0) {
3792 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3793 false);
3794 if (!refrc) {
3795 referral_walks_count++;
3796 goto try_mount_again;
3797 }
3798 }
3799 #endif
3800
3801 /* check if a whole path is not remote */
3802 if (!rc && tcon) {
3803 if (!server->ops->is_path_accessible) {
3804 rc = -ENOSYS;
3805 goto mount_fail_check;
3806 }
3807 /*
3808 * cifs_build_path_to_root works only when we have a valid tcon
3809 */
3810 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3811 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3812 if (full_path == NULL) {
3813 rc = -ENOMEM;
3814 goto mount_fail_check;
3815 }
3816 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3817 full_path);
3818 if (rc != 0 && rc != -EREMOTE) {
3819 kfree(full_path);
3820 goto mount_fail_check;
3821 }
3822
3823 if (rc != -EREMOTE) {
3824 rc = cifs_are_all_path_components_accessible(server,
3825 xid, tcon, cifs_sb,
3826 full_path);
3827 if (rc != 0) {
3828 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3829 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3830 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3831 rc = 0;
3832 }
3833 }
3834 kfree(full_path);
3835 }
3836
3837 /* get referral if needed */
3838 if (rc == -EREMOTE) {
3839 #ifdef CONFIG_CIFS_DFS_UPCALL
3840 if (referral_walks_count > MAX_NESTED_LINKS) {
3841 /*
3842 * BB: when we implement proper loop detection,
3843 * we will remove this check. But now we need it
3844 * to prevent an indefinite loop if 'DFS tree' is
3845 * misconfigured (i.e. has loops).
3846 */
3847 rc = -ELOOP;
3848 goto mount_fail_check;
3849 }
3850
3851 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3852
3853 if (!rc) {
3854 referral_walks_count++;
3855 goto try_mount_again;
3856 }
3857 goto mount_fail_check;
3858 #else /* No DFS support, return error on mount */
3859 rc = -EOPNOTSUPP;
3860 #endif
3861 }
3862
3863 if (rc)
3864 goto mount_fail_check;
3865
3866 /* now, hang the tcon off of the superblock */
3867 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3868 if (tlink == NULL) {
3869 rc = -ENOMEM;
3870 goto mount_fail_check;
3871 }
3872
3873 tlink->tl_uid = ses->linux_uid;
3874 tlink->tl_tcon = tcon;
3875 tlink->tl_time = jiffies;
3876 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3877 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3878
3879 cifs_sb->master_tlink = tlink;
3880 spin_lock(&cifs_sb->tlink_tree_lock);
3881 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3882 spin_unlock(&cifs_sb->tlink_tree_lock);
3883
3884 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3885 TLINK_IDLE_EXPIRE);
3886
3887 mount_fail_check:
3888 /* on error free sesinfo and tcon struct if needed */
3889 if (rc) {
3890 /* If find_unc succeeded then rc == 0 so we can not end */
3891 /* up accidentally freeing someone elses tcon struct */
3892 if (tcon)
3893 cifs_put_tcon(tcon);
3894 else if (ses)
3895 cifs_put_smb_ses(ses);
3896 else
3897 cifs_put_tcp_session(server, 0);
3898 }
3899
3900 out:
3901 free_xid(xid);
3902 return rc;
3903 }
3904
3905 /*
3906 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3907 * pointer may be NULL.
3908 */
3909 int
3910 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3911 const char *tree, struct cifs_tcon *tcon,
3912 const struct nls_table *nls_codepage)
3913 {
3914 struct smb_hdr *smb_buffer;
3915 struct smb_hdr *smb_buffer_response;
3916 TCONX_REQ *pSMB;
3917 TCONX_RSP *pSMBr;
3918 unsigned char *bcc_ptr;
3919 int rc = 0;
3920 int length;
3921 __u16 bytes_left, count;
3922
3923 if (ses == NULL)
3924 return -EIO;
3925
3926 smb_buffer = cifs_buf_get();
3927 if (smb_buffer == NULL)
3928 return -ENOMEM;
3929
3930 smb_buffer_response = smb_buffer;
3931
3932 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3933 NULL /*no tid */ , 4 /*wct */ );
3934
3935 smb_buffer->Mid = get_next_mid(ses->server);
3936 smb_buffer->Uid = ses->Suid;
3937 pSMB = (TCONX_REQ *) smb_buffer;
3938 pSMBr = (TCONX_RSP *) smb_buffer_response;
3939
3940 pSMB->AndXCommand = 0xFF;
3941 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3942 bcc_ptr = &pSMB->Password[0];
3943 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3944 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3945 *bcc_ptr = 0; /* password is null byte */
3946 bcc_ptr++; /* skip password */
3947 /* already aligned so no need to do it below */
3948 } else {
3949 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3950 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3951 specified as required (when that support is added to
3952 the vfs in the future) as only NTLM or the much
3953 weaker LANMAN (which we do not send by default) is accepted
3954 by Samba (not sure whether other servers allow
3955 NTLMv2 password here) */
3956 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3957 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3958 (ses->sectype == LANMAN))
3959 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3960 ses->server->sec_mode &
3961 SECMODE_PW_ENCRYPT ? true : false,
3962 bcc_ptr);
3963 else
3964 #endif /* CIFS_WEAK_PW_HASH */
3965 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3966 bcc_ptr, nls_codepage);
3967 if (rc) {
3968 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3969 __func__, rc);
3970 cifs_buf_release(smb_buffer);
3971 return rc;
3972 }
3973
3974 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3975 if (ses->capabilities & CAP_UNICODE) {
3976 /* must align unicode strings */
3977 *bcc_ptr = 0; /* null byte password */
3978 bcc_ptr++;
3979 }
3980 }
3981
3982 if (ses->server->sign)
3983 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3984
3985 if (ses->capabilities & CAP_STATUS32) {
3986 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3987 }
3988 if (ses->capabilities & CAP_DFS) {
3989 smb_buffer->Flags2 |= SMBFLG2_DFS;
3990 }
3991 if (ses->capabilities & CAP_UNICODE) {
3992 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3993 length =
3994 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3995 6 /* max utf8 char length in bytes */ *
3996 (/* server len*/ + 256 /* share len */), nls_codepage);
3997 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3998 bcc_ptr += 2; /* skip trailing null */
3999 } else { /* ASCII */
4000 strcpy(bcc_ptr, tree);
4001 bcc_ptr += strlen(tree) + 1;
4002 }
4003 strcpy(bcc_ptr, "?????");
4004 bcc_ptr += strlen("?????");
4005 bcc_ptr += 1;
4006 count = bcc_ptr - &pSMB->Password[0];
4007 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4008 pSMB->hdr.smb_buf_length) + count);
4009 pSMB->ByteCount = cpu_to_le16(count);
4010
4011 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4012 0);
4013
4014 /* above now done in SendReceive */
4015 if ((rc == 0) && (tcon != NULL)) {
4016 bool is_unicode;
4017
4018 tcon->tidStatus = CifsGood;
4019 tcon->need_reconnect = false;
4020 tcon->tid = smb_buffer_response->Tid;
4021 bcc_ptr = pByteArea(smb_buffer_response);
4022 bytes_left = get_bcc(smb_buffer_response);
4023 length = strnlen(bcc_ptr, bytes_left - 2);
4024 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4025 is_unicode = true;
4026 else
4027 is_unicode = false;
4028
4029
4030 /* skip service field (NB: this field is always ASCII) */
4031 if (length == 3) {
4032 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4033 (bcc_ptr[2] == 'C')) {
4034 cifs_dbg(FYI, "IPC connection\n");
4035 tcon->ipc = 1;
4036 }
4037 } else if (length == 2) {
4038 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4039 /* the most common case */
4040 cifs_dbg(FYI, "disk share connection\n");
4041 }
4042 }
4043 bcc_ptr += length + 1;
4044 bytes_left -= (length + 1);
4045 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4046
4047 /* mostly informational -- no need to fail on error here */
4048 kfree(tcon->nativeFileSystem);
4049 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4050 bytes_left, is_unicode,
4051 nls_codepage);
4052
4053 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4054
4055 if ((smb_buffer_response->WordCount == 3) ||
4056 (smb_buffer_response->WordCount == 7))
4057 /* field is in same location */
4058 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4059 else
4060 tcon->Flags = 0;
4061 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4062 } else if ((rc == 0) && tcon == NULL) {
4063 /* all we need to save for IPC$ connection */
4064 ses->ipc_tid = smb_buffer_response->Tid;
4065 }
4066
4067 cifs_buf_release(smb_buffer);
4068 return rc;
4069 }
4070
4071 static void delayed_free(struct rcu_head *p)
4072 {
4073 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4074 unload_nls(sbi->local_nls);
4075 kfree(sbi);
4076 }
4077
4078 void
4079 cifs_umount(struct cifs_sb_info *cifs_sb)
4080 {
4081 struct rb_root *root = &cifs_sb->tlink_tree;
4082 struct rb_node *node;
4083 struct tcon_link *tlink;
4084
4085 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4086
4087 spin_lock(&cifs_sb->tlink_tree_lock);
4088 while ((node = rb_first(root))) {
4089 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4090 cifs_get_tlink(tlink);
4091 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4092 rb_erase(node, root);
4093
4094 spin_unlock(&cifs_sb->tlink_tree_lock);
4095 cifs_put_tlink(tlink);
4096 spin_lock(&cifs_sb->tlink_tree_lock);
4097 }
4098 spin_unlock(&cifs_sb->tlink_tree_lock);
4099
4100 kfree(cifs_sb->mountdata);
4101 kfree(cifs_sb->prepath);
4102 call_rcu(&cifs_sb->rcu, delayed_free);
4103 }
4104
4105 int
4106 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4107 {
4108 int rc = 0;
4109 struct TCP_Server_Info *server = ses->server;
4110
4111 if (!server->ops->need_neg || !server->ops->negotiate)
4112 return -ENOSYS;
4113
4114 /* only send once per connect */
4115 if (!server->ops->need_neg(server))
4116 return 0;
4117
4118 set_credits(server, 1);
4119
4120 rc = server->ops->negotiate(xid, ses);
4121 if (rc == 0) {
4122 spin_lock(&GlobalMid_Lock);
4123 if (server->tcpStatus == CifsNeedNegotiate)
4124 server->tcpStatus = CifsGood;
4125 else
4126 rc = -EHOSTDOWN;
4127 spin_unlock(&GlobalMid_Lock);
4128 }
4129
4130 return rc;
4131 }
4132
4133 int
4134 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4135 struct nls_table *nls_info)
4136 {
4137 int rc = -ENOSYS;
4138 struct TCP_Server_Info *server = ses->server;
4139
4140 ses->capabilities = server->capabilities;
4141 if (linuxExtEnabled == 0)
4142 ses->capabilities &= (~server->vals->cap_unix);
4143
4144 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4145 server->sec_mode, server->capabilities, server->timeAdj);
4146
4147 if (server->ops->sess_setup)
4148 rc = server->ops->sess_setup(xid, ses, nls_info);
4149
4150 if (rc)
4151 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4152
4153 return rc;
4154 }
4155
4156 static int
4157 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4158 {
4159 vol->sectype = ses->sectype;
4160
4161 /* krb5 is special, since we don't need username or pw */
4162 if (vol->sectype == Kerberos)
4163 return 0;
4164
4165 return cifs_set_cifscreds(vol, ses);
4166 }
4167
4168 static struct cifs_tcon *
4169 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4170 {
4171 int rc;
4172 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4173 struct cifs_ses *ses;
4174 struct cifs_tcon *tcon = NULL;
4175 struct smb_vol *vol_info;
4176
4177 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4178 if (vol_info == NULL)
4179 return ERR_PTR(-ENOMEM);
4180
4181 vol_info->local_nls = cifs_sb->local_nls;
4182 vol_info->linux_uid = fsuid;
4183 vol_info->cred_uid = fsuid;
4184 vol_info->UNC = master_tcon->treeName;
4185 vol_info->retry = master_tcon->retry;
4186 vol_info->nocase = master_tcon->nocase;
4187 vol_info->local_lease = master_tcon->local_lease;
4188 vol_info->no_linux_ext = !master_tcon->unix_ext;
4189 vol_info->sectype = master_tcon->ses->sectype;
4190 vol_info->sign = master_tcon->ses->sign;
4191
4192 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4193 if (rc) {
4194 tcon = ERR_PTR(rc);
4195 goto out;
4196 }
4197
4198 /* get a reference for the same TCP session */
4199 spin_lock(&cifs_tcp_ses_lock);
4200 ++master_tcon->ses->server->srv_count;
4201 spin_unlock(&cifs_tcp_ses_lock);
4202
4203 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4204 if (IS_ERR(ses)) {
4205 tcon = (struct cifs_tcon *)ses;
4206 cifs_put_tcp_session(master_tcon->ses->server, 0);
4207 goto out;
4208 }
4209
4210 tcon = cifs_get_tcon(ses, vol_info);
4211 if (IS_ERR(tcon)) {
4212 cifs_put_smb_ses(ses);
4213 goto out;
4214 }
4215
4216 if (cap_unix(ses))
4217 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4218 out:
4219 kfree(vol_info->username);
4220 kfree(vol_info->password);
4221 kfree(vol_info);
4222
4223 return tcon;
4224 }
4225
4226 struct cifs_tcon *
4227 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4228 {
4229 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4230 }
4231
4232 /* find and return a tlink with given uid */
4233 static struct tcon_link *
4234 tlink_rb_search(struct rb_root *root, kuid_t uid)
4235 {
4236 struct rb_node *node = root->rb_node;
4237 struct tcon_link *tlink;
4238
4239 while (node) {
4240 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4241
4242 if (uid_gt(tlink->tl_uid, uid))
4243 node = node->rb_left;
4244 else if (uid_lt(tlink->tl_uid, uid))
4245 node = node->rb_right;
4246 else
4247 return tlink;
4248 }
4249 return NULL;
4250 }
4251
4252 /* insert a tcon_link into the tree */
4253 static void
4254 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4255 {
4256 struct rb_node **new = &(root->rb_node), *parent = NULL;
4257 struct tcon_link *tlink;
4258
4259 while (*new) {
4260 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4261 parent = *new;
4262
4263 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4264 new = &((*new)->rb_left);
4265 else
4266 new = &((*new)->rb_right);
4267 }
4268
4269 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4270 rb_insert_color(&new_tlink->tl_rbnode, root);
4271 }
4272
4273 /*
4274 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4275 * current task.
4276 *
4277 * If the superblock doesn't refer to a multiuser mount, then just return
4278 * the master tcon for the mount.
4279 *
4280 * First, search the rbtree for an existing tcon for this fsuid. If one
4281 * exists, then check to see if it's pending construction. If it is then wait
4282 * for construction to complete. Once it's no longer pending, check to see if
4283 * it failed and either return an error or retry construction, depending on
4284 * the timeout.
4285 *
4286 * If one doesn't exist then insert a new tcon_link struct into the tree and
4287 * try to construct a new one.
4288 */
4289 struct tcon_link *
4290 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4291 {
4292 int ret;
4293 kuid_t fsuid = current_fsuid();
4294 struct tcon_link *tlink, *newtlink;
4295
4296 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4297 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4298
4299 spin_lock(&cifs_sb->tlink_tree_lock);
4300 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4301 if (tlink)
4302 cifs_get_tlink(tlink);
4303 spin_unlock(&cifs_sb->tlink_tree_lock);
4304
4305 if (tlink == NULL) {
4306 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4307 if (newtlink == NULL)
4308 return ERR_PTR(-ENOMEM);
4309 newtlink->tl_uid = fsuid;
4310 newtlink->tl_tcon = ERR_PTR(-EACCES);
4311 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4312 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4313 cifs_get_tlink(newtlink);
4314
4315 spin_lock(&cifs_sb->tlink_tree_lock);
4316 /* was one inserted after previous search? */
4317 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4318 if (tlink) {
4319 cifs_get_tlink(tlink);
4320 spin_unlock(&cifs_sb->tlink_tree_lock);
4321 kfree(newtlink);
4322 goto wait_for_construction;
4323 }
4324 tlink = newtlink;
4325 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4326 spin_unlock(&cifs_sb->tlink_tree_lock);
4327 } else {
4328 wait_for_construction:
4329 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4330 TASK_INTERRUPTIBLE);
4331 if (ret) {
4332 cifs_put_tlink(tlink);
4333 return ERR_PTR(-ERESTARTSYS);
4334 }
4335
4336 /* if it's good, return it */
4337 if (!IS_ERR(tlink->tl_tcon))
4338 return tlink;
4339
4340 /* return error if we tried this already recently */
4341 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4342 cifs_put_tlink(tlink);
4343 return ERR_PTR(-EACCES);
4344 }
4345
4346 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4347 goto wait_for_construction;
4348 }
4349
4350 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4351 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4352 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4353
4354 if (IS_ERR(tlink->tl_tcon)) {
4355 cifs_put_tlink(tlink);
4356 return ERR_PTR(-EACCES);
4357 }
4358
4359 return tlink;
4360 }
4361
4362 /*
4363 * periodic workqueue job that scans tcon_tree for a superblock and closes
4364 * out tcons.
4365 */
4366 static void
4367 cifs_prune_tlinks(struct work_struct *work)
4368 {
4369 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4370 prune_tlinks.work);
4371 struct rb_root *root = &cifs_sb->tlink_tree;
4372 struct rb_node *node = rb_first(root);
4373 struct rb_node *tmp;
4374 struct tcon_link *tlink;
4375
4376 /*
4377 * Because we drop the spinlock in the loop in order to put the tlink
4378 * it's not guarded against removal of links from the tree. The only
4379 * places that remove entries from the tree are this function and
4380 * umounts. Because this function is non-reentrant and is canceled
4381 * before umount can proceed, this is safe.
4382 */
4383 spin_lock(&cifs_sb->tlink_tree_lock);
4384 node = rb_first(root);
4385 while (node != NULL) {
4386 tmp = node;
4387 node = rb_next(tmp);
4388 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4389
4390 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4391 atomic_read(&tlink->tl_count) != 0 ||
4392 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4393 continue;
4394
4395 cifs_get_tlink(tlink);
4396 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4397 rb_erase(tmp, root);
4398
4399 spin_unlock(&cifs_sb->tlink_tree_lock);
4400 cifs_put_tlink(tlink);
4401 spin_lock(&cifs_sb->tlink_tree_lock);
4402 }
4403 spin_unlock(&cifs_sb->tlink_tree_lock);
4404
4405 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4406 TLINK_IDLE_EXPIRE);
4407 }
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