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Merge branch 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-zesty-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/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <linux/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
42 #include <net/ipv6.h>
43 #include <linux/parser.h>
44 #include <linux/bvec.h>
45
46 #include "cifspdu.h"
47 #include "cifsglob.h"
48 #include "cifsproto.h"
49 #include "cifs_unicode.h"
50 #include "cifs_debug.h"
51 #include "cifs_fs_sb.h"
52 #include "ntlmssp.h"
53 #include "nterr.h"
54 #include "rfc1002pdu.h"
55 #include "fscache.h"
56 #ifdef CONFIG_CIFS_SMB2
57 #include "smb2proto.h"
58 #endif
59
60 #define CIFS_PORT 445
61 #define RFC1001_PORT 139
62
63 extern mempool_t *cifs_req_poolp;
64
65 /* FIXME: should these be tunable? */
66 #define TLINK_ERROR_EXPIRE (1 * HZ)
67 #define TLINK_IDLE_EXPIRE (600 * HZ)
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
73 Opt_forcegid, Opt_noforcegid,
74 Opt_noblocksend, Opt_noautotune,
75 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
76 Opt_mapposix, Opt_nomapposix,
77 Opt_mapchars, Opt_nomapchars, Opt_sfu,
78 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
79 Opt_noposixpaths, Opt_nounix,
80 Opt_nocase,
81 Opt_brl, Opt_nobrl,
82 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
83 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
84 Opt_nohard, Opt_nosoft,
85 Opt_nointr, Opt_intr,
86 Opt_nostrictsync, Opt_strictsync,
87 Opt_serverino, Opt_noserverino,
88 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
89 Opt_acl, Opt_noacl, Opt_locallease,
90 Opt_sign, Opt_seal, Opt_noac,
91 Opt_fsc, Opt_mfsymlinks,
92 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
93 Opt_persistent, Opt_nopersistent,
94 Opt_resilient, Opt_noresilient,
95 Opt_domainauto,
96
97 /* Mount options which take numeric value */
98 Opt_backupuid, Opt_backupgid, Opt_uid,
99 Opt_cruid, Opt_gid, Opt_file_mode,
100 Opt_dirmode, Opt_port,
101 Opt_rsize, Opt_wsize, Opt_actimeo,
102 Opt_echo_interval, Opt_max_credits,
103 Opt_snapshot,
104
105 /* Mount options which take string value */
106 Opt_user, Opt_pass, Opt_ip,
107 Opt_domain, Opt_srcaddr, Opt_iocharset,
108 Opt_netbiosname, Opt_servern,
109 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
110
111 /* Mount options to be ignored */
112 Opt_ignore,
113
114 /* Options which could be blank */
115 Opt_blank_pass,
116 Opt_blank_user,
117 Opt_blank_ip,
118
119 Opt_err
120 };
121
122 static const match_table_t cifs_mount_option_tokens = {
123
124 { Opt_user_xattr, "user_xattr" },
125 { Opt_nouser_xattr, "nouser_xattr" },
126 { Opt_forceuid, "forceuid" },
127 { Opt_noforceuid, "noforceuid" },
128 { Opt_forcegid, "forcegid" },
129 { Opt_noforcegid, "noforcegid" },
130 { Opt_noblocksend, "noblocksend" },
131 { Opt_noautotune, "noautotune" },
132 { Opt_hard, "hard" },
133 { Opt_soft, "soft" },
134 { Opt_perm, "perm" },
135 { Opt_noperm, "noperm" },
136 { Opt_mapchars, "mapchars" }, /* SFU style */
137 { Opt_nomapchars, "nomapchars" },
138 { Opt_mapposix, "mapposix" }, /* SFM style */
139 { Opt_nomapposix, "nomapposix" },
140 { Opt_sfu, "sfu" },
141 { Opt_nosfu, "nosfu" },
142 { Opt_nodfs, "nodfs" },
143 { Opt_posixpaths, "posixpaths" },
144 { Opt_noposixpaths, "noposixpaths" },
145 { Opt_nounix, "nounix" },
146 { Opt_nounix, "nolinux" },
147 { Opt_nocase, "nocase" },
148 { Opt_nocase, "ignorecase" },
149 { Opt_brl, "brl" },
150 { Opt_nobrl, "nobrl" },
151 { Opt_nobrl, "nolock" },
152 { Opt_forcemandatorylock, "forcemandatorylock" },
153 { Opt_forcemandatorylock, "forcemand" },
154 { Opt_setuids, "setuids" },
155 { Opt_nosetuids, "nosetuids" },
156 { Opt_setuidfromacl, "idsfromsid" },
157 { Opt_dynperm, "dynperm" },
158 { Opt_nodynperm, "nodynperm" },
159 { Opt_nohard, "nohard" },
160 { Opt_nosoft, "nosoft" },
161 { Opt_nointr, "nointr" },
162 { Opt_intr, "intr" },
163 { Opt_nostrictsync, "nostrictsync" },
164 { Opt_strictsync, "strictsync" },
165 { Opt_serverino, "serverino" },
166 { Opt_noserverino, "noserverino" },
167 { Opt_rwpidforward, "rwpidforward" },
168 { Opt_cifsacl, "cifsacl" },
169 { Opt_nocifsacl, "nocifsacl" },
170 { Opt_acl, "acl" },
171 { Opt_noacl, "noacl" },
172 { Opt_locallease, "locallease" },
173 { Opt_sign, "sign" },
174 { Opt_seal, "seal" },
175 { Opt_noac, "noac" },
176 { Opt_fsc, "fsc" },
177 { Opt_mfsymlinks, "mfsymlinks" },
178 { Opt_multiuser, "multiuser" },
179 { Opt_sloppy, "sloppy" },
180 { Opt_nosharesock, "nosharesock" },
181 { Opt_persistent, "persistenthandles"},
182 { Opt_nopersistent, "nopersistenthandles"},
183 { Opt_resilient, "resilienthandles"},
184 { Opt_noresilient, "noresilienthandles"},
185 { Opt_domainauto, "domainauto"},
186
187 { Opt_backupuid, "backupuid=%s" },
188 { Opt_backupgid, "backupgid=%s" },
189 { Opt_uid, "uid=%s" },
190 { Opt_cruid, "cruid=%s" },
191 { Opt_gid, "gid=%s" },
192 { Opt_file_mode, "file_mode=%s" },
193 { Opt_dirmode, "dirmode=%s" },
194 { Opt_dirmode, "dir_mode=%s" },
195 { Opt_port, "port=%s" },
196 { Opt_rsize, "rsize=%s" },
197 { Opt_wsize, "wsize=%s" },
198 { Opt_actimeo, "actimeo=%s" },
199 { Opt_echo_interval, "echo_interval=%s" },
200 { Opt_max_credits, "max_credits=%s" },
201 { Opt_snapshot, "snapshot=%s" },
202
203 { Opt_blank_user, "user=" },
204 { Opt_blank_user, "username=" },
205 { Opt_user, "user=%s" },
206 { Opt_user, "username=%s" },
207 { Opt_blank_pass, "pass=" },
208 { Opt_blank_pass, "password=" },
209 { Opt_pass, "pass=%s" },
210 { Opt_pass, "password=%s" },
211 { Opt_blank_ip, "ip=" },
212 { Opt_blank_ip, "addr=" },
213 { Opt_ip, "ip=%s" },
214 { Opt_ip, "addr=%s" },
215 { Opt_ignore, "unc=%s" },
216 { Opt_ignore, "target=%s" },
217 { Opt_ignore, "path=%s" },
218 { Opt_domain, "dom=%s" },
219 { Opt_domain, "domain=%s" },
220 { Opt_domain, "workgroup=%s" },
221 { Opt_srcaddr, "srcaddr=%s" },
222 { Opt_ignore, "prefixpath=%s" },
223 { Opt_iocharset, "iocharset=%s" },
224 { Opt_netbiosname, "netbiosname=%s" },
225 { Opt_servern, "servern=%s" },
226 { Opt_ver, "ver=%s" },
227 { Opt_vers, "vers=%s" },
228 { Opt_sec, "sec=%s" },
229 { Opt_cache, "cache=%s" },
230
231 { Opt_ignore, "cred" },
232 { Opt_ignore, "credentials" },
233 { Opt_ignore, "cred=%s" },
234 { Opt_ignore, "credentials=%s" },
235 { Opt_ignore, "guest" },
236 { Opt_ignore, "rw" },
237 { Opt_ignore, "ro" },
238 { Opt_ignore, "suid" },
239 { Opt_ignore, "nosuid" },
240 { Opt_ignore, "exec" },
241 { Opt_ignore, "noexec" },
242 { Opt_ignore, "nodev" },
243 { Opt_ignore, "noauto" },
244 { Opt_ignore, "dev" },
245 { Opt_ignore, "mand" },
246 { Opt_ignore, "nomand" },
247 { Opt_ignore, "_netdev" },
248
249 { Opt_err, NULL }
250 };
251
252 enum {
253 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
254 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
255 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
256 Opt_sec_ntlmv2i, Opt_sec_lanman,
257 Opt_sec_none,
258
259 Opt_sec_err
260 };
261
262 static const match_table_t cifs_secflavor_tokens = {
263 { Opt_sec_krb5, "krb5" },
264 { Opt_sec_krb5i, "krb5i" },
265 { Opt_sec_krb5p, "krb5p" },
266 { Opt_sec_ntlmsspi, "ntlmsspi" },
267 { Opt_sec_ntlmssp, "ntlmssp" },
268 { Opt_ntlm, "ntlm" },
269 { Opt_sec_ntlmi, "ntlmi" },
270 { Opt_sec_ntlmv2, "nontlm" },
271 { Opt_sec_ntlmv2, "ntlmv2" },
272 { Opt_sec_ntlmv2i, "ntlmv2i" },
273 { Opt_sec_lanman, "lanman" },
274 { Opt_sec_none, "none" },
275
276 { Opt_sec_err, NULL }
277 };
278
279 /* cache flavors */
280 enum {
281 Opt_cache_loose,
282 Opt_cache_strict,
283 Opt_cache_none,
284 Opt_cache_err
285 };
286
287 static const match_table_t cifs_cacheflavor_tokens = {
288 { Opt_cache_loose, "loose" },
289 { Opt_cache_strict, "strict" },
290 { Opt_cache_none, "none" },
291 { Opt_cache_err, NULL }
292 };
293
294 static const match_table_t cifs_smb_version_tokens = {
295 { Smb_1, SMB1_VERSION_STRING },
296 { Smb_20, SMB20_VERSION_STRING},
297 { Smb_21, SMB21_VERSION_STRING },
298 { Smb_30, SMB30_VERSION_STRING },
299 { Smb_302, SMB302_VERSION_STRING },
300 #ifdef CONFIG_CIFS_SMB311
301 { Smb_311, SMB311_VERSION_STRING },
302 { Smb_311, ALT_SMB311_VERSION_STRING },
303 #endif /* SMB311 */
304 { Smb_version_err, NULL }
305 };
306
307 static int ip_connect(struct TCP_Server_Info *server);
308 static int generic_ip_connect(struct TCP_Server_Info *server);
309 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
310 static void cifs_prune_tlinks(struct work_struct *work);
311 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
312 const char *devname);
313
314 /*
315 * cifs tcp session reconnection
316 *
317 * mark tcp session as reconnecting so temporarily locked
318 * mark all smb sessions as reconnecting for tcp session
319 * reconnect tcp session
320 * wake up waiters on reconnection? - (not needed currently)
321 */
322 int
323 cifs_reconnect(struct TCP_Server_Info *server)
324 {
325 int rc = 0;
326 struct list_head *tmp, *tmp2;
327 struct cifs_ses *ses;
328 struct cifs_tcon *tcon;
329 struct mid_q_entry *mid_entry;
330 struct list_head retry_list;
331
332 spin_lock(&GlobalMid_Lock);
333 if (server->tcpStatus == CifsExiting) {
334 /* the demux thread will exit normally
335 next time through the loop */
336 spin_unlock(&GlobalMid_Lock);
337 return rc;
338 } else
339 server->tcpStatus = CifsNeedReconnect;
340 spin_unlock(&GlobalMid_Lock);
341 server->maxBuf = 0;
342 #ifdef CONFIG_CIFS_SMB2
343 server->max_read = 0;
344 #endif
345
346 cifs_dbg(FYI, "Reconnecting tcp session\n");
347
348 /* before reconnecting the tcp session, mark the smb session (uid)
349 and the tid bad so they are not used until reconnected */
350 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
351 __func__);
352 spin_lock(&cifs_tcp_ses_lock);
353 list_for_each(tmp, &server->smb_ses_list) {
354 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
355 ses->need_reconnect = true;
356 ses->ipc_tid = 0;
357 list_for_each(tmp2, &ses->tcon_list) {
358 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
359 tcon->need_reconnect = true;
360 }
361 }
362 spin_unlock(&cifs_tcp_ses_lock);
363
364 /* do not want to be sending data on a socket we are freeing */
365 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
366 mutex_lock(&server->srv_mutex);
367 if (server->ssocket) {
368 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
369 server->ssocket->state, server->ssocket->flags);
370 kernel_sock_shutdown(server->ssocket, SHUT_WR);
371 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
372 server->ssocket->state, server->ssocket->flags);
373 sock_release(server->ssocket);
374 server->ssocket = NULL;
375 }
376 server->sequence_number = 0;
377 server->session_estab = false;
378 kfree(server->session_key.response);
379 server->session_key.response = NULL;
380 server->session_key.len = 0;
381 server->lstrp = jiffies;
382
383 /* mark submitted MIDs for retry and issue callback */
384 INIT_LIST_HEAD(&retry_list);
385 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
386 spin_lock(&GlobalMid_Lock);
387 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
388 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
389 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
390 mid_entry->mid_state = MID_RETRY_NEEDED;
391 list_move(&mid_entry->qhead, &retry_list);
392 }
393 spin_unlock(&GlobalMid_Lock);
394 mutex_unlock(&server->srv_mutex);
395
396 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
397 list_for_each_safe(tmp, tmp2, &retry_list) {
398 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
399 list_del_init(&mid_entry->qhead);
400 mid_entry->callback(mid_entry);
401 }
402
403 do {
404 try_to_freeze();
405
406 /* we should try only the port we connected to before */
407 mutex_lock(&server->srv_mutex);
408 rc = generic_ip_connect(server);
409 if (rc) {
410 cifs_dbg(FYI, "reconnect error %d\n", rc);
411 mutex_unlock(&server->srv_mutex);
412 msleep(3000);
413 } else {
414 atomic_inc(&tcpSesReconnectCount);
415 spin_lock(&GlobalMid_Lock);
416 if (server->tcpStatus != CifsExiting)
417 server->tcpStatus = CifsNeedNegotiate;
418 spin_unlock(&GlobalMid_Lock);
419 mutex_unlock(&server->srv_mutex);
420 }
421 } while (server->tcpStatus == CifsNeedReconnect);
422
423 if (server->tcpStatus == CifsNeedNegotiate)
424 mod_delayed_work(cifsiod_wq, &server->echo, 0);
425
426 return rc;
427 }
428
429 static void
430 cifs_echo_request(struct work_struct *work)
431 {
432 int rc;
433 struct TCP_Server_Info *server = container_of(work,
434 struct TCP_Server_Info, echo.work);
435 unsigned long echo_interval;
436
437 /*
438 * If we need to renegotiate, set echo interval to zero to
439 * immediately call echo service where we can renegotiate.
440 */
441 if (server->tcpStatus == CifsNeedNegotiate)
442 echo_interval = 0;
443 else
444 echo_interval = server->echo_interval;
445
446 /*
447 * We cannot send an echo if it is disabled.
448 * Also, no need to ping if we got a response recently.
449 */
450
451 if (server->tcpStatus == CifsNeedReconnect ||
452 server->tcpStatus == CifsExiting ||
453 server->tcpStatus == CifsNew ||
454 (server->ops->can_echo && !server->ops->can_echo(server)) ||
455 time_before(jiffies, server->lstrp + echo_interval - HZ))
456 goto requeue_echo;
457
458 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
459 if (rc)
460 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
461 server->hostname);
462
463 requeue_echo:
464 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
465 }
466
467 static bool
468 allocate_buffers(struct TCP_Server_Info *server)
469 {
470 if (!server->bigbuf) {
471 server->bigbuf = (char *)cifs_buf_get();
472 if (!server->bigbuf) {
473 cifs_dbg(VFS, "No memory for large SMB response\n");
474 msleep(3000);
475 /* retry will check if exiting */
476 return false;
477 }
478 } else if (server->large_buf) {
479 /* we are reusing a dirty large buf, clear its start */
480 memset(server->bigbuf, 0, HEADER_SIZE(server));
481 }
482
483 if (!server->smallbuf) {
484 server->smallbuf = (char *)cifs_small_buf_get();
485 if (!server->smallbuf) {
486 cifs_dbg(VFS, "No memory for SMB response\n");
487 msleep(1000);
488 /* retry will check if exiting */
489 return false;
490 }
491 /* beginning of smb buffer is cleared in our buf_get */
492 } else {
493 /* if existing small buf clear beginning */
494 memset(server->smallbuf, 0, HEADER_SIZE(server));
495 }
496
497 return true;
498 }
499
500 static bool
501 server_unresponsive(struct TCP_Server_Info *server)
502 {
503 /*
504 * We need to wait 2 echo intervals to make sure we handle such
505 * situations right:
506 * 1s client sends a normal SMB request
507 * 2s client gets a response
508 * 30s echo workqueue job pops, and decides we got a response recently
509 * and don't need to send another
510 * ...
511 * 65s kernel_recvmsg times out, and we see that we haven't gotten
512 * a response in >60s.
513 */
514 if (server->tcpStatus == CifsGood &&
515 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
516 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
517 server->hostname, (2 * server->echo_interval) / HZ);
518 cifs_reconnect(server);
519 wake_up(&server->response_q);
520 return true;
521 }
522
523 return false;
524 }
525
526 static int
527 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
528 {
529 int length = 0;
530 int total_read;
531
532 smb_msg->msg_control = NULL;
533 smb_msg->msg_controllen = 0;
534
535 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
536 try_to_freeze();
537
538 if (server_unresponsive(server))
539 return -ECONNABORTED;
540
541 length = sock_recvmsg(server->ssocket, smb_msg, 0);
542
543 if (server->tcpStatus == CifsExiting)
544 return -ESHUTDOWN;
545
546 if (server->tcpStatus == CifsNeedReconnect) {
547 cifs_reconnect(server);
548 return -ECONNABORTED;
549 }
550
551 if (length == -ERESTARTSYS ||
552 length == -EAGAIN ||
553 length == -EINTR) {
554 /*
555 * Minimum sleep to prevent looping, allowing socket
556 * to clear and app threads to set tcpStatus
557 * CifsNeedReconnect if server hung.
558 */
559 usleep_range(1000, 2000);
560 length = 0;
561 continue;
562 }
563
564 if (length <= 0) {
565 cifs_dbg(FYI, "Received no data or error: %d\n", length);
566 cifs_reconnect(server);
567 return -ECONNABORTED;
568 }
569 }
570 return total_read;
571 }
572
573 int
574 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
575 unsigned int to_read)
576 {
577 struct msghdr smb_msg;
578 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
579 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
580
581 return cifs_readv_from_socket(server, &smb_msg);
582 }
583
584 int
585 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
586 unsigned int to_read)
587 {
588 struct msghdr smb_msg;
589 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
590 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
591 return cifs_readv_from_socket(server, &smb_msg);
592 }
593
594 static bool
595 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
596 {
597 /*
598 * The first byte big endian of the length field,
599 * is actually not part of the length but the type
600 * with the most common, zero, as regular data.
601 */
602 switch (type) {
603 case RFC1002_SESSION_MESSAGE:
604 /* Regular SMB response */
605 return true;
606 case RFC1002_SESSION_KEEP_ALIVE:
607 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
608 break;
609 case RFC1002_POSITIVE_SESSION_RESPONSE:
610 cifs_dbg(FYI, "RFC 1002 positive session response\n");
611 break;
612 case RFC1002_NEGATIVE_SESSION_RESPONSE:
613 /*
614 * We get this from Windows 98 instead of an error on
615 * SMB negprot response.
616 */
617 cifs_dbg(FYI, "RFC 1002 negative session response\n");
618 /* give server a second to clean up */
619 msleep(1000);
620 /*
621 * Always try 445 first on reconnect since we get NACK
622 * on some if we ever connected to port 139 (the NACK
623 * is since we do not begin with RFC1001 session
624 * initialize frame).
625 */
626 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
627 cifs_reconnect(server);
628 wake_up(&server->response_q);
629 break;
630 default:
631 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
632 cifs_reconnect(server);
633 }
634
635 return false;
636 }
637
638 void
639 dequeue_mid(struct mid_q_entry *mid, bool malformed)
640 {
641 #ifdef CONFIG_CIFS_STATS2
642 mid->when_received = jiffies;
643 #endif
644 spin_lock(&GlobalMid_Lock);
645 if (!malformed)
646 mid->mid_state = MID_RESPONSE_RECEIVED;
647 else
648 mid->mid_state = MID_RESPONSE_MALFORMED;
649 list_del_init(&mid->qhead);
650 spin_unlock(&GlobalMid_Lock);
651 }
652
653 static void
654 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
655 char *buf, int malformed)
656 {
657 if (server->ops->check_trans2 &&
658 server->ops->check_trans2(mid, server, buf, malformed))
659 return;
660 mid->resp_buf = buf;
661 mid->large_buf = server->large_buf;
662 /* Was previous buf put in mpx struct for multi-rsp? */
663 if (!mid->multiRsp) {
664 /* smb buffer will be freed by user thread */
665 if (server->large_buf)
666 server->bigbuf = NULL;
667 else
668 server->smallbuf = NULL;
669 }
670 dequeue_mid(mid, malformed);
671 }
672
673 static void clean_demultiplex_info(struct TCP_Server_Info *server)
674 {
675 int length;
676
677 /* take it off the list, if it's not already */
678 spin_lock(&cifs_tcp_ses_lock);
679 list_del_init(&server->tcp_ses_list);
680 spin_unlock(&cifs_tcp_ses_lock);
681
682 spin_lock(&GlobalMid_Lock);
683 server->tcpStatus = CifsExiting;
684 spin_unlock(&GlobalMid_Lock);
685 wake_up_all(&server->response_q);
686
687 /* check if we have blocked requests that need to free */
688 spin_lock(&server->req_lock);
689 if (server->credits <= 0)
690 server->credits = 1;
691 spin_unlock(&server->req_lock);
692 /*
693 * Although there should not be any requests blocked on this queue it
694 * can not hurt to be paranoid and try to wake up requests that may
695 * haven been blocked when more than 50 at time were on the wire to the
696 * same server - they now will see the session is in exit state and get
697 * out of SendReceive.
698 */
699 wake_up_all(&server->request_q);
700 /* give those requests time to exit */
701 msleep(125);
702
703 if (server->ssocket) {
704 sock_release(server->ssocket);
705 server->ssocket = NULL;
706 }
707
708 if (!list_empty(&server->pending_mid_q)) {
709 struct list_head dispose_list;
710 struct mid_q_entry *mid_entry;
711 struct list_head *tmp, *tmp2;
712
713 INIT_LIST_HEAD(&dispose_list);
714 spin_lock(&GlobalMid_Lock);
715 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
716 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
717 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
718 mid_entry->mid_state = MID_SHUTDOWN;
719 list_move(&mid_entry->qhead, &dispose_list);
720 }
721 spin_unlock(&GlobalMid_Lock);
722
723 /* now walk dispose list and issue callbacks */
724 list_for_each_safe(tmp, tmp2, &dispose_list) {
725 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
726 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
727 list_del_init(&mid_entry->qhead);
728 mid_entry->callback(mid_entry);
729 }
730 /* 1/8th of sec is more than enough time for them to exit */
731 msleep(125);
732 }
733
734 if (!list_empty(&server->pending_mid_q)) {
735 /*
736 * mpx threads have not exited yet give them at least the smb
737 * send timeout time for long ops.
738 *
739 * Due to delays on oplock break requests, we need to wait at
740 * least 45 seconds before giving up on a request getting a
741 * response and going ahead and killing cifsd.
742 */
743 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
744 msleep(46000);
745 /*
746 * If threads still have not exited they are probably never
747 * coming home not much else we can do but free the memory.
748 */
749 }
750
751 kfree(server->hostname);
752 kfree(server);
753
754 length = atomic_dec_return(&tcpSesAllocCount);
755 if (length > 0)
756 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
757 }
758
759 static int
760 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
761 {
762 int length;
763 char *buf = server->smallbuf;
764 unsigned int pdu_length = get_rfc1002_length(buf);
765
766 /* make sure this will fit in a large buffer */
767 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
768 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
769 cifs_reconnect(server);
770 wake_up(&server->response_q);
771 return -ECONNABORTED;
772 }
773
774 /* switch to large buffer if too big for a small one */
775 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
776 server->large_buf = true;
777 memcpy(server->bigbuf, buf, server->total_read);
778 buf = server->bigbuf;
779 }
780
781 /* now read the rest */
782 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
783 pdu_length - HEADER_SIZE(server) + 1 + 4);
784 if (length < 0)
785 return length;
786 server->total_read += length;
787
788 dump_smb(buf, server->total_read);
789
790 /*
791 * We know that we received enough to get to the MID as we
792 * checked the pdu_length earlier. Now check to see
793 * if the rest of the header is OK. We borrow the length
794 * var for the rest of the loop to avoid a new stack var.
795 *
796 * 48 bytes is enough to display the header and a little bit
797 * into the payload for debugging purposes.
798 */
799 length = server->ops->check_message(buf, server->total_read, server);
800 if (length != 0)
801 cifs_dump_mem("Bad SMB: ", buf,
802 min_t(unsigned int, server->total_read, 48));
803
804 if (server->ops->is_status_pending &&
805 server->ops->is_status_pending(buf, server, length))
806 return -1;
807
808 if (!mid)
809 return length;
810
811 handle_mid(mid, server, buf, length);
812 return 0;
813 }
814
815 static int
816 cifs_demultiplex_thread(void *p)
817 {
818 int length;
819 struct TCP_Server_Info *server = p;
820 unsigned int pdu_length;
821 char *buf = NULL;
822 struct task_struct *task_to_wake = NULL;
823 struct mid_q_entry *mid_entry;
824
825 current->flags |= PF_MEMALLOC;
826 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
827
828 length = atomic_inc_return(&tcpSesAllocCount);
829 if (length > 1)
830 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
831
832 set_freezable();
833 while (server->tcpStatus != CifsExiting) {
834 if (try_to_freeze())
835 continue;
836
837 if (!allocate_buffers(server))
838 continue;
839
840 server->large_buf = false;
841 buf = server->smallbuf;
842 pdu_length = 4; /* enough to get RFC1001 header */
843
844 length = cifs_read_from_socket(server, buf, pdu_length);
845 if (length < 0)
846 continue;
847 server->total_read = length;
848
849 /*
850 * The right amount was read from socket - 4 bytes,
851 * so we can now interpret the length field.
852 */
853 pdu_length = get_rfc1002_length(buf);
854
855 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
856 if (!is_smb_response(server, buf[0]))
857 continue;
858
859 /* make sure we have enough to get to the MID */
860 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
861 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
862 pdu_length);
863 cifs_reconnect(server);
864 wake_up(&server->response_q);
865 continue;
866 }
867
868 /* read down to the MID */
869 length = cifs_read_from_socket(server, buf + 4,
870 HEADER_SIZE(server) - 1 - 4);
871 if (length < 0)
872 continue;
873 server->total_read += length;
874
875 mid_entry = server->ops->find_mid(server, buf);
876
877 if (!mid_entry || !mid_entry->receive)
878 length = standard_receive3(server, mid_entry);
879 else
880 length = mid_entry->receive(server, mid_entry);
881
882 if (length < 0)
883 continue;
884
885 if (server->large_buf)
886 buf = server->bigbuf;
887
888 server->lstrp = jiffies;
889 if (mid_entry != NULL) {
890 if (!mid_entry->multiRsp || mid_entry->multiEnd)
891 mid_entry->callback(mid_entry);
892 } else if (!server->ops->is_oplock_break ||
893 !server->ops->is_oplock_break(buf, server)) {
894 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
895 atomic_read(&midCount));
896 cifs_dump_mem("Received Data is: ", buf,
897 HEADER_SIZE(server));
898 #ifdef CONFIG_CIFS_DEBUG2
899 if (server->ops->dump_detail)
900 server->ops->dump_detail(buf);
901 cifs_dump_mids(server);
902 #endif /* CIFS_DEBUG2 */
903
904 }
905 } /* end while !EXITING */
906
907 /* buffer usually freed in free_mid - need to free it here on exit */
908 cifs_buf_release(server->bigbuf);
909 if (server->smallbuf) /* no sense logging a debug message if NULL */
910 cifs_small_buf_release(server->smallbuf);
911
912 task_to_wake = xchg(&server->tsk, NULL);
913 clean_demultiplex_info(server);
914
915 /* if server->tsk was NULL then wait for a signal before exiting */
916 if (!task_to_wake) {
917 set_current_state(TASK_INTERRUPTIBLE);
918 while (!signal_pending(current)) {
919 schedule();
920 set_current_state(TASK_INTERRUPTIBLE);
921 }
922 set_current_state(TASK_RUNNING);
923 }
924
925 module_put_and_exit(0);
926 }
927
928 /* extract the host portion of the UNC string */
929 static char *
930 extract_hostname(const char *unc)
931 {
932 const char *src;
933 char *dst, *delim;
934 unsigned int len;
935
936 /* skip double chars at beginning of string */
937 /* BB: check validity of these bytes? */
938 src = unc + 2;
939
940 /* delimiter between hostname and sharename is always '\\' now */
941 delim = strchr(src, '\\');
942 if (!delim)
943 return ERR_PTR(-EINVAL);
944
945 len = delim - src;
946 dst = kmalloc((len + 1), GFP_KERNEL);
947 if (dst == NULL)
948 return ERR_PTR(-ENOMEM);
949
950 memcpy(dst, src, len);
951 dst[len] = '\0';
952
953 return dst;
954 }
955
956 static int get_option_ul(substring_t args[], unsigned long *option)
957 {
958 int rc;
959 char *string;
960
961 string = match_strdup(args);
962 if (string == NULL)
963 return -ENOMEM;
964 rc = kstrtoul(string, 0, option);
965 kfree(string);
966
967 return rc;
968 }
969
970 static int get_option_uid(substring_t args[], kuid_t *result)
971 {
972 unsigned long value;
973 kuid_t uid;
974 int rc;
975
976 rc = get_option_ul(args, &value);
977 if (rc)
978 return rc;
979
980 uid = make_kuid(current_user_ns(), value);
981 if (!uid_valid(uid))
982 return -EINVAL;
983
984 *result = uid;
985 return 0;
986 }
987
988 static int get_option_gid(substring_t args[], kgid_t *result)
989 {
990 unsigned long value;
991 kgid_t gid;
992 int rc;
993
994 rc = get_option_ul(args, &value);
995 if (rc)
996 return rc;
997
998 gid = make_kgid(current_user_ns(), value);
999 if (!gid_valid(gid))
1000 return -EINVAL;
1001
1002 *result = gid;
1003 return 0;
1004 }
1005
1006 static int cifs_parse_security_flavors(char *value,
1007 struct smb_vol *vol)
1008 {
1009
1010 substring_t args[MAX_OPT_ARGS];
1011
1012 /*
1013 * With mount options, the last one should win. Reset any existing
1014 * settings back to default.
1015 */
1016 vol->sectype = Unspecified;
1017 vol->sign = false;
1018
1019 switch (match_token(value, cifs_secflavor_tokens, args)) {
1020 case Opt_sec_krb5p:
1021 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1022 return 1;
1023 case Opt_sec_krb5i:
1024 vol->sign = true;
1025 /* Fallthrough */
1026 case Opt_sec_krb5:
1027 vol->sectype = Kerberos;
1028 break;
1029 case Opt_sec_ntlmsspi:
1030 vol->sign = true;
1031 /* Fallthrough */
1032 case Opt_sec_ntlmssp:
1033 vol->sectype = RawNTLMSSP;
1034 break;
1035 case Opt_sec_ntlmi:
1036 vol->sign = true;
1037 /* Fallthrough */
1038 case Opt_ntlm:
1039 vol->sectype = NTLM;
1040 break;
1041 case Opt_sec_ntlmv2i:
1042 vol->sign = true;
1043 /* Fallthrough */
1044 case Opt_sec_ntlmv2:
1045 vol->sectype = NTLMv2;
1046 break;
1047 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1048 case Opt_sec_lanman:
1049 vol->sectype = LANMAN;
1050 break;
1051 #endif
1052 case Opt_sec_none:
1053 vol->nullauth = 1;
1054 break;
1055 default:
1056 cifs_dbg(VFS, "bad security option: %s\n", value);
1057 return 1;
1058 }
1059
1060 return 0;
1061 }
1062
1063 static int
1064 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1065 {
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1069 case Opt_cache_loose:
1070 vol->direct_io = false;
1071 vol->strict_io = false;
1072 break;
1073 case Opt_cache_strict:
1074 vol->direct_io = false;
1075 vol->strict_io = true;
1076 break;
1077 case Opt_cache_none:
1078 vol->direct_io = true;
1079 vol->strict_io = false;
1080 break;
1081 default:
1082 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1083 return 1;
1084 }
1085 return 0;
1086 }
1087
1088 static int
1089 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1090 {
1091 substring_t args[MAX_OPT_ARGS];
1092
1093 switch (match_token(value, cifs_smb_version_tokens, args)) {
1094 case Smb_1:
1095 vol->ops = &smb1_operations;
1096 vol->vals = &smb1_values;
1097 break;
1098 #ifdef CONFIG_CIFS_SMB2
1099 case Smb_20:
1100 vol->ops = &smb20_operations;
1101 vol->vals = &smb20_values;
1102 break;
1103 case Smb_21:
1104 vol->ops = &smb21_operations;
1105 vol->vals = &smb21_values;
1106 break;
1107 case Smb_30:
1108 vol->ops = &smb30_operations;
1109 vol->vals = &smb30_values;
1110 break;
1111 case Smb_302:
1112 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1113 vol->vals = &smb302_values;
1114 break;
1115 #ifdef CONFIG_CIFS_SMB311
1116 case Smb_311:
1117 vol->ops = &smb311_operations;
1118 vol->vals = &smb311_values;
1119 break;
1120 #endif /* SMB311 */
1121 #endif
1122 default:
1123 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1124 return 1;
1125 }
1126 return 0;
1127 }
1128
1129 /*
1130 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1131 * fields with the result. Returns 0 on success and an error otherwise.
1132 */
1133 static int
1134 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1135 {
1136 char *pos;
1137 const char *delims = "/\\";
1138 size_t len;
1139
1140 /* make sure we have a valid UNC double delimiter prefix */
1141 len = strspn(devname, delims);
1142 if (len != 2)
1143 return -EINVAL;
1144
1145 /* find delimiter between host and sharename */
1146 pos = strpbrk(devname + 2, delims);
1147 if (!pos)
1148 return -EINVAL;
1149
1150 /* skip past delimiter */
1151 ++pos;
1152
1153 /* now go until next delimiter or end of string */
1154 len = strcspn(pos, delims);
1155
1156 /* move "pos" up to delimiter or NULL */
1157 pos += len;
1158 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1159 if (!vol->UNC)
1160 return -ENOMEM;
1161
1162 convert_delimiter(vol->UNC, '\\');
1163
1164 /* skip any delimiter */
1165 if (*pos == '/' || *pos == '\\')
1166 pos++;
1167
1168 /* If pos is NULL then no prepath */
1169 if (!*pos)
1170 return 0;
1171
1172 vol->prepath = kstrdup(pos, GFP_KERNEL);
1173 if (!vol->prepath)
1174 return -ENOMEM;
1175
1176 return 0;
1177 }
1178
1179 static int
1180 cifs_parse_mount_options(const char *mountdata, const char *devname,
1181 struct smb_vol *vol)
1182 {
1183 char *data, *end;
1184 char *mountdata_copy = NULL, *options;
1185 unsigned int temp_len, i, j;
1186 char separator[2];
1187 short int override_uid = -1;
1188 short int override_gid = -1;
1189 bool uid_specified = false;
1190 bool gid_specified = false;
1191 bool sloppy = false;
1192 char *invalid = NULL;
1193 char *nodename = utsname()->nodename;
1194 char *string = NULL;
1195 char *tmp_end, *value;
1196 char delim;
1197 bool got_ip = false;
1198 unsigned short port = 0;
1199 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1200
1201 separator[0] = ',';
1202 separator[1] = 0;
1203 delim = separator[0];
1204
1205 /* ensure we always start with zeroed-out smb_vol */
1206 memset(vol, 0, sizeof(*vol));
1207
1208 /*
1209 * does not have to be perfect mapping since field is
1210 * informational, only used for servers that do not support
1211 * port 445 and it can be overridden at mount time
1212 */
1213 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1214 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1215 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1216
1217 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1218 /* null target name indicates to use *SMBSERVR default called name
1219 if we end up sending RFC1001 session initialize */
1220 vol->target_rfc1001_name[0] = 0;
1221 vol->cred_uid = current_uid();
1222 vol->linux_uid = current_uid();
1223 vol->linux_gid = current_gid();
1224
1225 /*
1226 * default to SFM style remapping of seven reserved characters
1227 * unless user overrides it or we negotiate CIFS POSIX where
1228 * it is unnecessary. Can not simultaneously use more than one mapping
1229 * since then readdir could list files that open could not open
1230 */
1231 vol->remap = true;
1232
1233 /* default to only allowing write access to owner of the mount */
1234 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1235
1236 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1237 /* default is always to request posix paths. */
1238 vol->posix_paths = 1;
1239 /* default to using server inode numbers where available */
1240 vol->server_ino = 1;
1241
1242 /* default is to use strict cifs caching semantics */
1243 vol->strict_io = true;
1244
1245 vol->actimeo = CIFS_DEF_ACTIMEO;
1246
1247 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1248 vol->ops = &smb1_operations;
1249 vol->vals = &smb1_values;
1250
1251 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1252
1253 if (!mountdata)
1254 goto cifs_parse_mount_err;
1255
1256 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1257 if (!mountdata_copy)
1258 goto cifs_parse_mount_err;
1259
1260 options = mountdata_copy;
1261 end = options + strlen(options);
1262
1263 if (strncmp(options, "sep=", 4) == 0) {
1264 if (options[4] != 0) {
1265 separator[0] = options[4];
1266 options += 5;
1267 } else {
1268 cifs_dbg(FYI, "Null separator not allowed\n");
1269 }
1270 }
1271 vol->backupuid_specified = false; /* no backup intent for a user */
1272 vol->backupgid_specified = false; /* no backup intent for a group */
1273
1274 switch (cifs_parse_devname(devname, vol)) {
1275 case 0:
1276 break;
1277 case -ENOMEM:
1278 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1279 goto cifs_parse_mount_err;
1280 case -EINVAL:
1281 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1282 goto cifs_parse_mount_err;
1283 default:
1284 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1285 goto cifs_parse_mount_err;
1286 }
1287
1288 while ((data = strsep(&options, separator)) != NULL) {
1289 substring_t args[MAX_OPT_ARGS];
1290 unsigned long option;
1291 int token;
1292
1293 if (!*data)
1294 continue;
1295
1296 token = match_token(data, cifs_mount_option_tokens, args);
1297
1298 switch (token) {
1299
1300 /* Ingnore the following */
1301 case Opt_ignore:
1302 break;
1303
1304 /* Boolean values */
1305 case Opt_user_xattr:
1306 vol->no_xattr = 0;
1307 break;
1308 case Opt_nouser_xattr:
1309 vol->no_xattr = 1;
1310 break;
1311 case Opt_forceuid:
1312 override_uid = 1;
1313 break;
1314 case Opt_noforceuid:
1315 override_uid = 0;
1316 break;
1317 case Opt_forcegid:
1318 override_gid = 1;
1319 break;
1320 case Opt_noforcegid:
1321 override_gid = 0;
1322 break;
1323 case Opt_noblocksend:
1324 vol->noblocksnd = 1;
1325 break;
1326 case Opt_noautotune:
1327 vol->noautotune = 1;
1328 break;
1329 case Opt_hard:
1330 vol->retry = 1;
1331 break;
1332 case Opt_soft:
1333 vol->retry = 0;
1334 break;
1335 case Opt_perm:
1336 vol->noperm = 0;
1337 break;
1338 case Opt_noperm:
1339 vol->noperm = 1;
1340 break;
1341 case Opt_mapchars:
1342 vol->sfu_remap = true;
1343 vol->remap = false; /* disable SFM mapping */
1344 break;
1345 case Opt_nomapchars:
1346 vol->sfu_remap = false;
1347 break;
1348 case Opt_mapposix:
1349 vol->remap = true;
1350 vol->sfu_remap = false; /* disable SFU mapping */
1351 break;
1352 case Opt_nomapposix:
1353 vol->remap = false;
1354 break;
1355 case Opt_sfu:
1356 vol->sfu_emul = 1;
1357 break;
1358 case Opt_nosfu:
1359 vol->sfu_emul = 0;
1360 break;
1361 case Opt_nodfs:
1362 vol->nodfs = 1;
1363 break;
1364 case Opt_posixpaths:
1365 vol->posix_paths = 1;
1366 break;
1367 case Opt_noposixpaths:
1368 vol->posix_paths = 0;
1369 break;
1370 case Opt_nounix:
1371 vol->no_linux_ext = 1;
1372 break;
1373 case Opt_nocase:
1374 vol->nocase = 1;
1375 break;
1376 case Opt_brl:
1377 vol->nobrl = 0;
1378 break;
1379 case Opt_nobrl:
1380 vol->nobrl = 1;
1381 /*
1382 * turn off mandatory locking in mode
1383 * if remote locking is turned off since the
1384 * local vfs will do advisory
1385 */
1386 if (vol->file_mode ==
1387 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1388 vol->file_mode = S_IALLUGO;
1389 break;
1390 case Opt_forcemandatorylock:
1391 vol->mand_lock = 1;
1392 break;
1393 case Opt_setuids:
1394 vol->setuids = 1;
1395 break;
1396 case Opt_nosetuids:
1397 vol->setuids = 0;
1398 break;
1399 case Opt_setuidfromacl:
1400 vol->setuidfromacl = 1;
1401 break;
1402 case Opt_dynperm:
1403 vol->dynperm = true;
1404 break;
1405 case Opt_nodynperm:
1406 vol->dynperm = false;
1407 break;
1408 case Opt_nohard:
1409 vol->retry = 0;
1410 break;
1411 case Opt_nosoft:
1412 vol->retry = 1;
1413 break;
1414 case Opt_nointr:
1415 vol->intr = 0;
1416 break;
1417 case Opt_intr:
1418 vol->intr = 1;
1419 break;
1420 case Opt_nostrictsync:
1421 vol->nostrictsync = 1;
1422 break;
1423 case Opt_strictsync:
1424 vol->nostrictsync = 0;
1425 break;
1426 case Opt_serverino:
1427 vol->server_ino = 1;
1428 break;
1429 case Opt_noserverino:
1430 vol->server_ino = 0;
1431 break;
1432 case Opt_rwpidforward:
1433 vol->rwpidforward = 1;
1434 break;
1435 case Opt_cifsacl:
1436 vol->cifs_acl = 1;
1437 break;
1438 case Opt_nocifsacl:
1439 vol->cifs_acl = 0;
1440 break;
1441 case Opt_acl:
1442 vol->no_psx_acl = 0;
1443 break;
1444 case Opt_noacl:
1445 vol->no_psx_acl = 1;
1446 break;
1447 case Opt_locallease:
1448 vol->local_lease = 1;
1449 break;
1450 case Opt_sign:
1451 vol->sign = true;
1452 break;
1453 case Opt_seal:
1454 /* we do not do the following in secFlags because seal
1455 * is a per tree connection (mount) not a per socket
1456 * or per-smb connection option in the protocol
1457 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1458 */
1459 vol->seal = 1;
1460 break;
1461 case Opt_noac:
1462 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1463 break;
1464 case Opt_fsc:
1465 #ifndef CONFIG_CIFS_FSCACHE
1466 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1467 goto cifs_parse_mount_err;
1468 #endif
1469 vol->fsc = true;
1470 break;
1471 case Opt_mfsymlinks:
1472 vol->mfsymlinks = true;
1473 break;
1474 case Opt_multiuser:
1475 vol->multiuser = true;
1476 break;
1477 case Opt_sloppy:
1478 sloppy = true;
1479 break;
1480 case Opt_nosharesock:
1481 vol->nosharesock = true;
1482 break;
1483 case Opt_nopersistent:
1484 vol->nopersistent = true;
1485 if (vol->persistent) {
1486 cifs_dbg(VFS,
1487 "persistenthandles mount options conflict\n");
1488 goto cifs_parse_mount_err;
1489 }
1490 break;
1491 case Opt_persistent:
1492 vol->persistent = true;
1493 if ((vol->nopersistent) || (vol->resilient)) {
1494 cifs_dbg(VFS,
1495 "persistenthandles mount options conflict\n");
1496 goto cifs_parse_mount_err;
1497 }
1498 break;
1499 case Opt_resilient:
1500 vol->resilient = true;
1501 if (vol->persistent) {
1502 cifs_dbg(VFS,
1503 "persistenthandles mount options conflict\n");
1504 goto cifs_parse_mount_err;
1505 }
1506 break;
1507 case Opt_noresilient:
1508 vol->resilient = false; /* already the default */
1509 break;
1510 case Opt_domainauto:
1511 vol->domainauto = true;
1512 break;
1513
1514 /* Numeric Values */
1515 case Opt_backupuid:
1516 if (get_option_uid(args, &vol->backupuid)) {
1517 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1518 __func__);
1519 goto cifs_parse_mount_err;
1520 }
1521 vol->backupuid_specified = true;
1522 break;
1523 case Opt_backupgid:
1524 if (get_option_gid(args, &vol->backupgid)) {
1525 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1526 __func__);
1527 goto cifs_parse_mount_err;
1528 }
1529 vol->backupgid_specified = true;
1530 break;
1531 case Opt_uid:
1532 if (get_option_uid(args, &vol->linux_uid)) {
1533 cifs_dbg(VFS, "%s: Invalid uid value\n",
1534 __func__);
1535 goto cifs_parse_mount_err;
1536 }
1537 uid_specified = true;
1538 break;
1539 case Opt_cruid:
1540 if (get_option_uid(args, &vol->cred_uid)) {
1541 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1542 __func__);
1543 goto cifs_parse_mount_err;
1544 }
1545 break;
1546 case Opt_gid:
1547 if (get_option_gid(args, &vol->linux_gid)) {
1548 cifs_dbg(VFS, "%s: Invalid gid value\n",
1549 __func__);
1550 goto cifs_parse_mount_err;
1551 }
1552 gid_specified = true;
1553 break;
1554 case Opt_file_mode:
1555 if (get_option_ul(args, &option)) {
1556 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1557 __func__);
1558 goto cifs_parse_mount_err;
1559 }
1560 vol->file_mode = option;
1561 break;
1562 case Opt_dirmode:
1563 if (get_option_ul(args, &option)) {
1564 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1565 __func__);
1566 goto cifs_parse_mount_err;
1567 }
1568 vol->dir_mode = option;
1569 break;
1570 case Opt_port:
1571 if (get_option_ul(args, &option) ||
1572 option > USHRT_MAX) {
1573 cifs_dbg(VFS, "%s: Invalid port value\n",
1574 __func__);
1575 goto cifs_parse_mount_err;
1576 }
1577 port = (unsigned short)option;
1578 break;
1579 case Opt_rsize:
1580 if (get_option_ul(args, &option)) {
1581 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1582 __func__);
1583 goto cifs_parse_mount_err;
1584 }
1585 vol->rsize = option;
1586 break;
1587 case Opt_wsize:
1588 if (get_option_ul(args, &option)) {
1589 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1590 __func__);
1591 goto cifs_parse_mount_err;
1592 }
1593 vol->wsize = option;
1594 break;
1595 case Opt_actimeo:
1596 if (get_option_ul(args, &option)) {
1597 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1598 __func__);
1599 goto cifs_parse_mount_err;
1600 }
1601 vol->actimeo = HZ * option;
1602 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1603 cifs_dbg(VFS, "attribute cache timeout too large\n");
1604 goto cifs_parse_mount_err;
1605 }
1606 break;
1607 case Opt_echo_interval:
1608 if (get_option_ul(args, &option)) {
1609 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1610 __func__);
1611 goto cifs_parse_mount_err;
1612 }
1613 vol->echo_interval = option;
1614 break;
1615 case Opt_snapshot:
1616 if (get_option_ul(args, &option)) {
1617 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1618 __func__);
1619 goto cifs_parse_mount_err;
1620 }
1621 vol->snapshot_time = option;
1622 break;
1623 case Opt_max_credits:
1624 if (get_option_ul(args, &option) || (option < 20) ||
1625 (option > 60000)) {
1626 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1627 __func__);
1628 goto cifs_parse_mount_err;
1629 }
1630 vol->max_credits = option;
1631 break;
1632
1633 /* String Arguments */
1634
1635 case Opt_blank_user:
1636 /* null user, ie. anonymous authentication */
1637 vol->nullauth = 1;
1638 vol->username = NULL;
1639 break;
1640 case Opt_user:
1641 string = match_strdup(args);
1642 if (string == NULL)
1643 goto out_nomem;
1644
1645 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1646 CIFS_MAX_USERNAME_LEN) {
1647 pr_warn("CIFS: username too long\n");
1648 goto cifs_parse_mount_err;
1649 }
1650
1651 kfree(vol->username);
1652 vol->username = kstrdup(string, GFP_KERNEL);
1653 if (!vol->username)
1654 goto cifs_parse_mount_err;
1655 break;
1656 case Opt_blank_pass:
1657 /* passwords have to be handled differently
1658 * to allow the character used for deliminator
1659 * to be passed within them
1660 */
1661
1662 /*
1663 * Check if this is a case where the password
1664 * starts with a delimiter
1665 */
1666 tmp_end = strchr(data, '=');
1667 tmp_end++;
1668 if (!(tmp_end < end && tmp_end[1] == delim)) {
1669 /* No it is not. Set the password to NULL */
1670 kfree(vol->password);
1671 vol->password = NULL;
1672 break;
1673 }
1674 /* Yes it is. Drop down to Opt_pass below.*/
1675 case Opt_pass:
1676 /* Obtain the value string */
1677 value = strchr(data, '=');
1678 value++;
1679
1680 /* Set tmp_end to end of the string */
1681 tmp_end = (char *) value + strlen(value);
1682
1683 /* Check if following character is the deliminator
1684 * If yes, we have encountered a double deliminator
1685 * reset the NULL character to the deliminator
1686 */
1687 if (tmp_end < end && tmp_end[1] == delim) {
1688 tmp_end[0] = delim;
1689
1690 /* Keep iterating until we get to a single
1691 * deliminator OR the end
1692 */
1693 while ((tmp_end = strchr(tmp_end, delim))
1694 != NULL && (tmp_end[1] == delim)) {
1695 tmp_end = (char *) &tmp_end[2];
1696 }
1697
1698 /* Reset var options to point to next element */
1699 if (tmp_end) {
1700 tmp_end[0] = '\0';
1701 options = (char *) &tmp_end[1];
1702 } else
1703 /* Reached the end of the mount option
1704 * string */
1705 options = end;
1706 }
1707
1708 kfree(vol->password);
1709 /* Now build new password string */
1710 temp_len = strlen(value);
1711 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1712 if (vol->password == NULL) {
1713 pr_warn("CIFS: no memory for password\n");
1714 goto cifs_parse_mount_err;
1715 }
1716
1717 for (i = 0, j = 0; i < temp_len; i++, j++) {
1718 vol->password[j] = value[i];
1719 if ((value[i] == delim) &&
1720 value[i+1] == delim)
1721 /* skip the second deliminator */
1722 i++;
1723 }
1724 vol->password[j] = '\0';
1725 break;
1726 case Opt_blank_ip:
1727 /* FIXME: should this be an error instead? */
1728 got_ip = false;
1729 break;
1730 case Opt_ip:
1731 string = match_strdup(args);
1732 if (string == NULL)
1733 goto out_nomem;
1734
1735 if (!cifs_convert_address(dstaddr, string,
1736 strlen(string))) {
1737 pr_err("CIFS: bad ip= option (%s).\n", string);
1738 goto cifs_parse_mount_err;
1739 }
1740 got_ip = true;
1741 break;
1742 case Opt_domain:
1743 string = match_strdup(args);
1744 if (string == NULL)
1745 goto out_nomem;
1746
1747 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1748 == CIFS_MAX_DOMAINNAME_LEN) {
1749 pr_warn("CIFS: domain name too long\n");
1750 goto cifs_parse_mount_err;
1751 }
1752
1753 kfree(vol->domainname);
1754 vol->domainname = kstrdup(string, GFP_KERNEL);
1755 if (!vol->domainname) {
1756 pr_warn("CIFS: no memory for domainname\n");
1757 goto cifs_parse_mount_err;
1758 }
1759 cifs_dbg(FYI, "Domain name set\n");
1760 break;
1761 case Opt_srcaddr:
1762 string = match_strdup(args);
1763 if (string == NULL)
1764 goto out_nomem;
1765
1766 if (!cifs_convert_address(
1767 (struct sockaddr *)&vol->srcaddr,
1768 string, strlen(string))) {
1769 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1770 string);
1771 goto cifs_parse_mount_err;
1772 }
1773 break;
1774 case Opt_iocharset:
1775 string = match_strdup(args);
1776 if (string == NULL)
1777 goto out_nomem;
1778
1779 if (strnlen(string, 1024) >= 65) {
1780 pr_warn("CIFS: iocharset name too long.\n");
1781 goto cifs_parse_mount_err;
1782 }
1783
1784 if (strncasecmp(string, "default", 7) != 0) {
1785 kfree(vol->iocharset);
1786 vol->iocharset = kstrdup(string,
1787 GFP_KERNEL);
1788 if (!vol->iocharset) {
1789 pr_warn("CIFS: no memory for charset\n");
1790 goto cifs_parse_mount_err;
1791 }
1792 }
1793 /* if iocharset not set then load_nls_default
1794 * is used by caller
1795 */
1796 cifs_dbg(FYI, "iocharset set to %s\n", string);
1797 break;
1798 case Opt_netbiosname:
1799 string = match_strdup(args);
1800 if (string == NULL)
1801 goto out_nomem;
1802
1803 memset(vol->source_rfc1001_name, 0x20,
1804 RFC1001_NAME_LEN);
1805 /*
1806 * FIXME: are there cases in which a comma can
1807 * be valid in workstation netbios name (and
1808 * need special handling)?
1809 */
1810 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1811 /* don't ucase netbiosname for user */
1812 if (string[i] == 0)
1813 break;
1814 vol->source_rfc1001_name[i] = string[i];
1815 }
1816 /* The string has 16th byte zero still from
1817 * set at top of the function
1818 */
1819 if (i == RFC1001_NAME_LEN && string[i] != 0)
1820 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1821 break;
1822 case Opt_servern:
1823 /* servernetbiosname specified override *SMBSERVER */
1824 string = match_strdup(args);
1825 if (string == NULL)
1826 goto out_nomem;
1827
1828 /* last byte, type, is 0x20 for servr type */
1829 memset(vol->target_rfc1001_name, 0x20,
1830 RFC1001_NAME_LEN_WITH_NULL);
1831
1832 /* BB are there cases in which a comma can be
1833 valid in this workstation netbios name
1834 (and need special handling)? */
1835
1836 /* user or mount helper must uppercase the
1837 netbios name */
1838 for (i = 0; i < 15; i++) {
1839 if (string[i] == 0)
1840 break;
1841 vol->target_rfc1001_name[i] = string[i];
1842 }
1843 /* The string has 16th byte zero still from
1844 set at top of the function */
1845 if (i == RFC1001_NAME_LEN && string[i] != 0)
1846 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1847 break;
1848 case Opt_ver:
1849 string = match_strdup(args);
1850 if (string == NULL)
1851 goto out_nomem;
1852
1853 if (strncasecmp(string, "1", 1) == 0) {
1854 /* This is the default */
1855 break;
1856 }
1857 /* For all other value, error */
1858 pr_warn("CIFS: Invalid version specified\n");
1859 goto cifs_parse_mount_err;
1860 case Opt_vers:
1861 string = match_strdup(args);
1862 if (string == NULL)
1863 goto out_nomem;
1864
1865 if (cifs_parse_smb_version(string, vol) != 0)
1866 goto cifs_parse_mount_err;
1867 break;
1868 case Opt_sec:
1869 string = match_strdup(args);
1870 if (string == NULL)
1871 goto out_nomem;
1872
1873 if (cifs_parse_security_flavors(string, vol) != 0)
1874 goto cifs_parse_mount_err;
1875 break;
1876 case Opt_cache:
1877 string = match_strdup(args);
1878 if (string == NULL)
1879 goto out_nomem;
1880
1881 if (cifs_parse_cache_flavor(string, vol) != 0)
1882 goto cifs_parse_mount_err;
1883 break;
1884 default:
1885 /*
1886 * An option we don't recognize. Save it off for later
1887 * if we haven't already found one
1888 */
1889 if (!invalid)
1890 invalid = data;
1891 break;
1892 }
1893 /* Free up any allocated string */
1894 kfree(string);
1895 string = NULL;
1896 }
1897
1898 if (!sloppy && invalid) {
1899 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1900 goto cifs_parse_mount_err;
1901 }
1902
1903 #ifndef CONFIG_KEYS
1904 /* Muliuser mounts require CONFIG_KEYS support */
1905 if (vol->multiuser) {
1906 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1907 goto cifs_parse_mount_err;
1908 }
1909 #endif
1910 if (!vol->UNC) {
1911 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1912 goto cifs_parse_mount_err;
1913 }
1914
1915 /* make sure UNC has a share name */
1916 if (!strchr(vol->UNC + 3, '\\')) {
1917 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1918 goto cifs_parse_mount_err;
1919 }
1920
1921 if (!got_ip) {
1922 /* No ip= option specified? Try to get it from UNC */
1923 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1924 strlen(&vol->UNC[2]))) {
1925 pr_err("Unable to determine destination address.\n");
1926 goto cifs_parse_mount_err;
1927 }
1928 }
1929
1930 /* set the port that we got earlier */
1931 cifs_set_port(dstaddr, port);
1932
1933 if (uid_specified)
1934 vol->override_uid = override_uid;
1935 else if (override_uid == 1)
1936 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1937
1938 if (gid_specified)
1939 vol->override_gid = override_gid;
1940 else if (override_gid == 1)
1941 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1942
1943 kfree(mountdata_copy);
1944 return 0;
1945
1946 out_nomem:
1947 pr_warn("Could not allocate temporary buffer\n");
1948 cifs_parse_mount_err:
1949 kfree(string);
1950 kfree(mountdata_copy);
1951 return 1;
1952 }
1953
1954 /** Returns true if srcaddr isn't specified and rhs isn't
1955 * specified, or if srcaddr is specified and
1956 * matches the IP address of the rhs argument.
1957 */
1958 static bool
1959 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1960 {
1961 switch (srcaddr->sa_family) {
1962 case AF_UNSPEC:
1963 return (rhs->sa_family == AF_UNSPEC);
1964 case AF_INET: {
1965 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1966 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1967 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1968 }
1969 case AF_INET6: {
1970 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1971 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1972 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1973 }
1974 default:
1975 WARN_ON(1);
1976 return false; /* don't expect to be here */
1977 }
1978 }
1979
1980 /*
1981 * If no port is specified in addr structure, we try to match with 445 port
1982 * and if it fails - with 139 ports. It should be called only if address
1983 * families of server and addr are equal.
1984 */
1985 static bool
1986 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1987 {
1988 __be16 port, *sport;
1989
1990 switch (addr->sa_family) {
1991 case AF_INET:
1992 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1993 port = ((struct sockaddr_in *) addr)->sin_port;
1994 break;
1995 case AF_INET6:
1996 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1997 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1998 break;
1999 default:
2000 WARN_ON(1);
2001 return false;
2002 }
2003
2004 if (!port) {
2005 port = htons(CIFS_PORT);
2006 if (port == *sport)
2007 return true;
2008
2009 port = htons(RFC1001_PORT);
2010 }
2011
2012 return port == *sport;
2013 }
2014
2015 static bool
2016 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2017 struct sockaddr *srcaddr)
2018 {
2019 switch (addr->sa_family) {
2020 case AF_INET: {
2021 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2022 struct sockaddr_in *srv_addr4 =
2023 (struct sockaddr_in *)&server->dstaddr;
2024
2025 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2026 return false;
2027 break;
2028 }
2029 case AF_INET6: {
2030 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2031 struct sockaddr_in6 *srv_addr6 =
2032 (struct sockaddr_in6 *)&server->dstaddr;
2033
2034 if (!ipv6_addr_equal(&addr6->sin6_addr,
2035 &srv_addr6->sin6_addr))
2036 return false;
2037 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2038 return false;
2039 break;
2040 }
2041 default:
2042 WARN_ON(1);
2043 return false; /* don't expect to be here */
2044 }
2045
2046 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2047 return false;
2048
2049 return true;
2050 }
2051
2052 static bool
2053 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2054 {
2055 /*
2056 * The select_sectype function should either return the vol->sectype
2057 * that was specified, or "Unspecified" if that sectype was not
2058 * compatible with the given NEGOTIATE request.
2059 */
2060 if (select_sectype(server, vol->sectype) == Unspecified)
2061 return false;
2062
2063 /*
2064 * Now check if signing mode is acceptable. No need to check
2065 * global_secflags at this point since if MUST_SIGN is set then
2066 * the server->sign had better be too.
2067 */
2068 if (vol->sign && !server->sign)
2069 return false;
2070
2071 return true;
2072 }
2073
2074 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2075 {
2076 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2077
2078 if (vol->nosharesock)
2079 return 0;
2080
2081 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2082 return 0;
2083
2084 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2085 return 0;
2086
2087 if (!match_address(server, addr,
2088 (struct sockaddr *)&vol->srcaddr))
2089 return 0;
2090
2091 if (!match_port(server, addr))
2092 return 0;
2093
2094 if (!match_security(server, vol))
2095 return 0;
2096
2097 if (server->echo_interval != vol->echo_interval * HZ)
2098 return 0;
2099
2100 return 1;
2101 }
2102
2103 static struct TCP_Server_Info *
2104 cifs_find_tcp_session(struct smb_vol *vol)
2105 {
2106 struct TCP_Server_Info *server;
2107
2108 spin_lock(&cifs_tcp_ses_lock);
2109 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2110 if (!match_server(server, vol))
2111 continue;
2112
2113 ++server->srv_count;
2114 spin_unlock(&cifs_tcp_ses_lock);
2115 cifs_dbg(FYI, "Existing tcp session with server found\n");
2116 return server;
2117 }
2118 spin_unlock(&cifs_tcp_ses_lock);
2119 return NULL;
2120 }
2121
2122 void
2123 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2124 {
2125 struct task_struct *task;
2126
2127 spin_lock(&cifs_tcp_ses_lock);
2128 if (--server->srv_count > 0) {
2129 spin_unlock(&cifs_tcp_ses_lock);
2130 return;
2131 }
2132
2133 put_net(cifs_net_ns(server));
2134
2135 list_del_init(&server->tcp_ses_list);
2136 spin_unlock(&cifs_tcp_ses_lock);
2137
2138 cancel_delayed_work_sync(&server->echo);
2139
2140 #ifdef CONFIG_CIFS_SMB2
2141 if (from_reconnect)
2142 /*
2143 * Avoid deadlock here: reconnect work calls
2144 * cifs_put_tcp_session() at its end. Need to be sure
2145 * that reconnect work does nothing with server pointer after
2146 * that step.
2147 */
2148 cancel_delayed_work(&server->reconnect);
2149 else
2150 cancel_delayed_work_sync(&server->reconnect);
2151 #endif
2152
2153 spin_lock(&GlobalMid_Lock);
2154 server->tcpStatus = CifsExiting;
2155 spin_unlock(&GlobalMid_Lock);
2156
2157 cifs_crypto_shash_release(server);
2158 cifs_fscache_release_client_cookie(server);
2159
2160 kfree(server->session_key.response);
2161 server->session_key.response = NULL;
2162 server->session_key.len = 0;
2163
2164 task = xchg(&server->tsk, NULL);
2165 if (task)
2166 force_sig(SIGKILL, task);
2167 }
2168
2169 static struct TCP_Server_Info *
2170 cifs_get_tcp_session(struct smb_vol *volume_info)
2171 {
2172 struct TCP_Server_Info *tcp_ses = NULL;
2173 int rc;
2174
2175 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2176
2177 /* see if we already have a matching tcp_ses */
2178 tcp_ses = cifs_find_tcp_session(volume_info);
2179 if (tcp_ses)
2180 return tcp_ses;
2181
2182 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2183 if (!tcp_ses) {
2184 rc = -ENOMEM;
2185 goto out_err;
2186 }
2187
2188 tcp_ses->ops = volume_info->ops;
2189 tcp_ses->vals = volume_info->vals;
2190 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2191 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2192 if (IS_ERR(tcp_ses->hostname)) {
2193 rc = PTR_ERR(tcp_ses->hostname);
2194 goto out_err_crypto_release;
2195 }
2196
2197 tcp_ses->noblocksnd = volume_info->noblocksnd;
2198 tcp_ses->noautotune = volume_info->noautotune;
2199 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2200 tcp_ses->in_flight = 0;
2201 tcp_ses->credits = 1;
2202 init_waitqueue_head(&tcp_ses->response_q);
2203 init_waitqueue_head(&tcp_ses->request_q);
2204 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2205 mutex_init(&tcp_ses->srv_mutex);
2206 memcpy(tcp_ses->workstation_RFC1001_name,
2207 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2208 memcpy(tcp_ses->server_RFC1001_name,
2209 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2210 tcp_ses->session_estab = false;
2211 tcp_ses->sequence_number = 0;
2212 tcp_ses->lstrp = jiffies;
2213 spin_lock_init(&tcp_ses->req_lock);
2214 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2215 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2216 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2217 #ifdef CONFIG_CIFS_SMB2
2218 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2219 mutex_init(&tcp_ses->reconnect_mutex);
2220 #endif
2221 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2222 sizeof(tcp_ses->srcaddr));
2223 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2224 sizeof(tcp_ses->dstaddr));
2225 #ifdef CONFIG_CIFS_SMB2
2226 generate_random_uuid(tcp_ses->client_guid);
2227 #endif
2228 /*
2229 * at this point we are the only ones with the pointer
2230 * to the struct since the kernel thread not created yet
2231 * no need to spinlock this init of tcpStatus or srv_count
2232 */
2233 tcp_ses->tcpStatus = CifsNew;
2234 ++tcp_ses->srv_count;
2235
2236 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2237 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2238 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2239 else
2240 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2241
2242 rc = ip_connect(tcp_ses);
2243 if (rc < 0) {
2244 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2245 goto out_err_crypto_release;
2246 }
2247
2248 /*
2249 * since we're in a cifs function already, we know that
2250 * this will succeed. No need for try_module_get().
2251 */
2252 __module_get(THIS_MODULE);
2253 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2254 tcp_ses, "cifsd");
2255 if (IS_ERR(tcp_ses->tsk)) {
2256 rc = PTR_ERR(tcp_ses->tsk);
2257 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2258 module_put(THIS_MODULE);
2259 goto out_err_crypto_release;
2260 }
2261 tcp_ses->tcpStatus = CifsNeedNegotiate;
2262
2263 /* thread spawned, put it on the list */
2264 spin_lock(&cifs_tcp_ses_lock);
2265 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2266 spin_unlock(&cifs_tcp_ses_lock);
2267
2268 cifs_fscache_get_client_cookie(tcp_ses);
2269
2270 /* queue echo request delayed work */
2271 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2272
2273 return tcp_ses;
2274
2275 out_err_crypto_release:
2276 cifs_crypto_shash_release(tcp_ses);
2277
2278 put_net(cifs_net_ns(tcp_ses));
2279
2280 out_err:
2281 if (tcp_ses) {
2282 if (!IS_ERR(tcp_ses->hostname))
2283 kfree(tcp_ses->hostname);
2284 if (tcp_ses->ssocket)
2285 sock_release(tcp_ses->ssocket);
2286 kfree(tcp_ses);
2287 }
2288 return ERR_PTR(rc);
2289 }
2290
2291 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2292 {
2293 if (vol->sectype != Unspecified &&
2294 vol->sectype != ses->sectype)
2295 return 0;
2296
2297 switch (ses->sectype) {
2298 case Kerberos:
2299 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2300 return 0;
2301 break;
2302 default:
2303 /* NULL username means anonymous session */
2304 if (ses->user_name == NULL) {
2305 if (!vol->nullauth)
2306 return 0;
2307 break;
2308 }
2309
2310 /* anything else takes username/password */
2311 if (strncmp(ses->user_name,
2312 vol->username ? vol->username : "",
2313 CIFS_MAX_USERNAME_LEN))
2314 return 0;
2315 if ((vol->username && strlen(vol->username) != 0) &&
2316 ses->password != NULL &&
2317 strncmp(ses->password,
2318 vol->password ? vol->password : "",
2319 CIFS_MAX_PASSWORD_LEN))
2320 return 0;
2321 }
2322 return 1;
2323 }
2324
2325 static struct cifs_ses *
2326 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2327 {
2328 struct cifs_ses *ses;
2329
2330 spin_lock(&cifs_tcp_ses_lock);
2331 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2332 if (ses->status == CifsExiting)
2333 continue;
2334 if (!match_session(ses, vol))
2335 continue;
2336 ++ses->ses_count;
2337 spin_unlock(&cifs_tcp_ses_lock);
2338 return ses;
2339 }
2340 spin_unlock(&cifs_tcp_ses_lock);
2341 return NULL;
2342 }
2343
2344 static void
2345 cifs_put_smb_ses(struct cifs_ses *ses)
2346 {
2347 unsigned int rc, xid;
2348 struct TCP_Server_Info *server = ses->server;
2349
2350 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2351
2352 spin_lock(&cifs_tcp_ses_lock);
2353 if (ses->status == CifsExiting) {
2354 spin_unlock(&cifs_tcp_ses_lock);
2355 return;
2356 }
2357 if (--ses->ses_count > 0) {
2358 spin_unlock(&cifs_tcp_ses_lock);
2359 return;
2360 }
2361 if (ses->status == CifsGood)
2362 ses->status = CifsExiting;
2363 spin_unlock(&cifs_tcp_ses_lock);
2364
2365 if (ses->status == CifsExiting && server->ops->logoff) {
2366 xid = get_xid();
2367 rc = server->ops->logoff(xid, ses);
2368 if (rc)
2369 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2370 __func__, rc);
2371 _free_xid(xid);
2372 }
2373
2374 spin_lock(&cifs_tcp_ses_lock);
2375 list_del_init(&ses->smb_ses_list);
2376 spin_unlock(&cifs_tcp_ses_lock);
2377
2378 sesInfoFree(ses);
2379 cifs_put_tcp_session(server, 0);
2380 }
2381
2382 #ifdef CONFIG_KEYS
2383
2384 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2385 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2386
2387 /* Populate username and pw fields from keyring if possible */
2388 static int
2389 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2390 {
2391 int rc = 0;
2392 const char *delim, *payload;
2393 char *desc;
2394 ssize_t len;
2395 struct key *key;
2396 struct TCP_Server_Info *server = ses->server;
2397 struct sockaddr_in *sa;
2398 struct sockaddr_in6 *sa6;
2399 const struct user_key_payload *upayload;
2400
2401 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2402 if (!desc)
2403 return -ENOMEM;
2404
2405 /* try to find an address key first */
2406 switch (server->dstaddr.ss_family) {
2407 case AF_INET:
2408 sa = (struct sockaddr_in *)&server->dstaddr;
2409 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2410 break;
2411 case AF_INET6:
2412 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2413 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2414 break;
2415 default:
2416 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2417 server->dstaddr.ss_family);
2418 rc = -EINVAL;
2419 goto out_err;
2420 }
2421
2422 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2423 key = request_key(&key_type_logon, desc, "");
2424 if (IS_ERR(key)) {
2425 if (!ses->domainName) {
2426 cifs_dbg(FYI, "domainName is NULL\n");
2427 rc = PTR_ERR(key);
2428 goto out_err;
2429 }
2430
2431 /* didn't work, try to find a domain key */
2432 sprintf(desc, "cifs:d:%s", ses->domainName);
2433 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2434 key = request_key(&key_type_logon, desc, "");
2435 if (IS_ERR(key)) {
2436 rc = PTR_ERR(key);
2437 goto out_err;
2438 }
2439 }
2440
2441 down_read(&key->sem);
2442 upayload = user_key_payload(key);
2443 if (IS_ERR_OR_NULL(upayload)) {
2444 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2445 goto out_key_put;
2446 }
2447
2448 /* find first : in payload */
2449 payload = upayload->data;
2450 delim = strnchr(payload, upayload->datalen, ':');
2451 cifs_dbg(FYI, "payload=%s\n", payload);
2452 if (!delim) {
2453 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2454 upayload->datalen);
2455 rc = -EINVAL;
2456 goto out_key_put;
2457 }
2458
2459 len = delim - payload;
2460 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2461 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2462 len);
2463 rc = -EINVAL;
2464 goto out_key_put;
2465 }
2466
2467 vol->username = kstrndup(payload, len, GFP_KERNEL);
2468 if (!vol->username) {
2469 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2470 len);
2471 rc = -ENOMEM;
2472 goto out_key_put;
2473 }
2474 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2475
2476 len = key->datalen - (len + 1);
2477 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2478 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2479 rc = -EINVAL;
2480 kfree(vol->username);
2481 vol->username = NULL;
2482 goto out_key_put;
2483 }
2484
2485 ++delim;
2486 vol->password = kstrndup(delim, len, GFP_KERNEL);
2487 if (!vol->password) {
2488 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2489 len);
2490 rc = -ENOMEM;
2491 kfree(vol->username);
2492 vol->username = NULL;
2493 goto out_key_put;
2494 }
2495
2496 out_key_put:
2497 up_read(&key->sem);
2498 key_put(key);
2499 out_err:
2500 kfree(desc);
2501 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2502 return rc;
2503 }
2504 #else /* ! CONFIG_KEYS */
2505 static inline int
2506 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2507 struct cifs_ses *ses __attribute__((unused)))
2508 {
2509 return -ENOSYS;
2510 }
2511 #endif /* CONFIG_KEYS */
2512
2513 static struct cifs_ses *
2514 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2515 {
2516 int rc = -ENOMEM;
2517 unsigned int xid;
2518 struct cifs_ses *ses;
2519 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2520 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2521
2522 xid = get_xid();
2523
2524 ses = cifs_find_smb_ses(server, volume_info);
2525 if (ses) {
2526 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2527 ses->status);
2528
2529 mutex_lock(&ses->session_mutex);
2530 rc = cifs_negotiate_protocol(xid, ses);
2531 if (rc) {
2532 mutex_unlock(&ses->session_mutex);
2533 /* problem -- put our ses reference */
2534 cifs_put_smb_ses(ses);
2535 free_xid(xid);
2536 return ERR_PTR(rc);
2537 }
2538 if (ses->need_reconnect) {
2539 cifs_dbg(FYI, "Session needs reconnect\n");
2540 rc = cifs_setup_session(xid, ses,
2541 volume_info->local_nls);
2542 if (rc) {
2543 mutex_unlock(&ses->session_mutex);
2544 /* problem -- put our reference */
2545 cifs_put_smb_ses(ses);
2546 free_xid(xid);
2547 return ERR_PTR(rc);
2548 }
2549 }
2550 mutex_unlock(&ses->session_mutex);
2551
2552 /* existing SMB ses has a server reference already */
2553 cifs_put_tcp_session(server, 0);
2554 free_xid(xid);
2555 return ses;
2556 }
2557
2558 cifs_dbg(FYI, "Existing smb sess not found\n");
2559 ses = sesInfoAlloc();
2560 if (ses == NULL)
2561 goto get_ses_fail;
2562
2563 /* new SMB session uses our server ref */
2564 ses->server = server;
2565 if (server->dstaddr.ss_family == AF_INET6)
2566 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2567 else
2568 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2569
2570 if (volume_info->username) {
2571 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2572 if (!ses->user_name)
2573 goto get_ses_fail;
2574 }
2575
2576 /* volume_info->password freed at unmount */
2577 if (volume_info->password) {
2578 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2579 if (!ses->password)
2580 goto get_ses_fail;
2581 }
2582 if (volume_info->domainname) {
2583 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2584 if (!ses->domainName)
2585 goto get_ses_fail;
2586 }
2587 if (volume_info->domainauto)
2588 ses->domainAuto = volume_info->domainauto;
2589 ses->cred_uid = volume_info->cred_uid;
2590 ses->linux_uid = volume_info->linux_uid;
2591
2592 ses->sectype = volume_info->sectype;
2593 ses->sign = volume_info->sign;
2594
2595 mutex_lock(&ses->session_mutex);
2596 rc = cifs_negotiate_protocol(xid, ses);
2597 if (!rc)
2598 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2599 mutex_unlock(&ses->session_mutex);
2600 if (rc)
2601 goto get_ses_fail;
2602
2603 /* success, put it on the list */
2604 spin_lock(&cifs_tcp_ses_lock);
2605 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2606 spin_unlock(&cifs_tcp_ses_lock);
2607
2608 free_xid(xid);
2609 return ses;
2610
2611 get_ses_fail:
2612 sesInfoFree(ses);
2613 free_xid(xid);
2614 return ERR_PTR(rc);
2615 }
2616
2617 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2618 {
2619 if (tcon->tidStatus == CifsExiting)
2620 return 0;
2621 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2622 return 0;
2623 return 1;
2624 }
2625
2626 static struct cifs_tcon *
2627 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2628 {
2629 struct list_head *tmp;
2630 struct cifs_tcon *tcon;
2631
2632 spin_lock(&cifs_tcp_ses_lock);
2633 list_for_each(tmp, &ses->tcon_list) {
2634 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2635 if (!match_tcon(tcon, volume_info->UNC))
2636 continue;
2637
2638 #ifdef CONFIG_CIFS_SMB2
2639 if (tcon->snapshot_time != volume_info->snapshot_time)
2640 continue;
2641 #endif /* CONFIG_CIFS_SMB2 */
2642
2643 ++tcon->tc_count;
2644 spin_unlock(&cifs_tcp_ses_lock);
2645 return tcon;
2646 }
2647 spin_unlock(&cifs_tcp_ses_lock);
2648 return NULL;
2649 }
2650
2651 void
2652 cifs_put_tcon(struct cifs_tcon *tcon)
2653 {
2654 unsigned int xid;
2655 struct cifs_ses *ses = tcon->ses;
2656
2657 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2658 spin_lock(&cifs_tcp_ses_lock);
2659 if (--tcon->tc_count > 0) {
2660 spin_unlock(&cifs_tcp_ses_lock);
2661 return;
2662 }
2663
2664 list_del_init(&tcon->tcon_list);
2665 spin_unlock(&cifs_tcp_ses_lock);
2666
2667 xid = get_xid();
2668 if (ses->server->ops->tree_disconnect)
2669 ses->server->ops->tree_disconnect(xid, tcon);
2670 _free_xid(xid);
2671
2672 cifs_fscache_release_super_cookie(tcon);
2673 tconInfoFree(tcon);
2674 cifs_put_smb_ses(ses);
2675 }
2676
2677 static struct cifs_tcon *
2678 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2679 {
2680 int rc, xid;
2681 struct cifs_tcon *tcon;
2682
2683 tcon = cifs_find_tcon(ses, volume_info);
2684 if (tcon) {
2685 cifs_dbg(FYI, "Found match on UNC path\n");
2686 /* existing tcon already has a reference */
2687 cifs_put_smb_ses(ses);
2688 if (tcon->seal != volume_info->seal)
2689 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2690 return tcon;
2691 }
2692
2693 if (!ses->server->ops->tree_connect) {
2694 rc = -ENOSYS;
2695 goto out_fail;
2696 }
2697
2698 tcon = tconInfoAlloc();
2699 if (tcon == NULL) {
2700 rc = -ENOMEM;
2701 goto out_fail;
2702 }
2703
2704 if (volume_info->snapshot_time) {
2705 #ifdef CONFIG_CIFS_SMB2
2706 if (ses->server->vals->protocol_id == 0) {
2707 cifs_dbg(VFS,
2708 "Use SMB2 or later for snapshot mount option\n");
2709 rc = -EOPNOTSUPP;
2710 goto out_fail;
2711 } else
2712 tcon->snapshot_time = volume_info->snapshot_time;
2713 #else
2714 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2715 rc = -EOPNOTSUPP;
2716 goto out_fail;
2717 #endif /* CONFIG_CIFS_SMB2 */
2718 }
2719
2720 tcon->ses = ses;
2721 if (volume_info->password) {
2722 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2723 if (!tcon->password) {
2724 rc = -ENOMEM;
2725 goto out_fail;
2726 }
2727 }
2728
2729 /*
2730 * BB Do we need to wrap session_mutex around this TCon call and Unix
2731 * SetFS as we do on SessSetup and reconnect?
2732 */
2733 xid = get_xid();
2734 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2735 volume_info->local_nls);
2736 free_xid(xid);
2737 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2738 if (rc)
2739 goto out_fail;
2740
2741 if (volume_info->nodfs) {
2742 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2743 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2744 }
2745 tcon->seal = volume_info->seal;
2746 tcon->use_persistent = false;
2747 /* check if SMB2 or later, CIFS does not support persistent handles */
2748 if (volume_info->persistent) {
2749 if (ses->server->vals->protocol_id == 0) {
2750 cifs_dbg(VFS,
2751 "SMB3 or later required for persistent handles\n");
2752 rc = -EOPNOTSUPP;
2753 goto out_fail;
2754 #ifdef CONFIG_CIFS_SMB2
2755 } else if (ses->server->capabilities &
2756 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2757 tcon->use_persistent = true;
2758 else /* persistent handles requested but not supported */ {
2759 cifs_dbg(VFS,
2760 "Persistent handles not supported on share\n");
2761 rc = -EOPNOTSUPP;
2762 goto out_fail;
2763 #endif /* CONFIG_CIFS_SMB2 */
2764 }
2765 #ifdef CONFIG_CIFS_SMB2
2766 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2767 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2768 && (volume_info->nopersistent == false)) {
2769 cifs_dbg(FYI, "enabling persistent handles\n");
2770 tcon->use_persistent = true;
2771 #endif /* CONFIG_CIFS_SMB2 */
2772 } else if (volume_info->resilient) {
2773 if (ses->server->vals->protocol_id == 0) {
2774 cifs_dbg(VFS,
2775 "SMB2.1 or later required for resilient handles\n");
2776 rc = -EOPNOTSUPP;
2777 goto out_fail;
2778 }
2779 tcon->use_resilient = true;
2780 }
2781
2782 /*
2783 * We can have only one retry value for a connection to a share so for
2784 * resources mounted more than once to the same server share the last
2785 * value passed in for the retry flag is used.
2786 */
2787 tcon->retry = volume_info->retry;
2788 tcon->nocase = volume_info->nocase;
2789 tcon->local_lease = volume_info->local_lease;
2790 INIT_LIST_HEAD(&tcon->pending_opens);
2791
2792 spin_lock(&cifs_tcp_ses_lock);
2793 list_add(&tcon->tcon_list, &ses->tcon_list);
2794 spin_unlock(&cifs_tcp_ses_lock);
2795
2796 cifs_fscache_get_super_cookie(tcon);
2797
2798 return tcon;
2799
2800 out_fail:
2801 tconInfoFree(tcon);
2802 return ERR_PTR(rc);
2803 }
2804
2805 void
2806 cifs_put_tlink(struct tcon_link *tlink)
2807 {
2808 if (!tlink || IS_ERR(tlink))
2809 return;
2810
2811 if (!atomic_dec_and_test(&tlink->tl_count) ||
2812 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2813 tlink->tl_time = jiffies;
2814 return;
2815 }
2816
2817 if (!IS_ERR(tlink_tcon(tlink)))
2818 cifs_put_tcon(tlink_tcon(tlink));
2819 kfree(tlink);
2820 return;
2821 }
2822
2823 static inline struct tcon_link *
2824 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2825 {
2826 return cifs_sb->master_tlink;
2827 }
2828
2829 static int
2830 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2831 {
2832 struct cifs_sb_info *old = CIFS_SB(sb);
2833 struct cifs_sb_info *new = mnt_data->cifs_sb;
2834
2835 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2836 return 0;
2837
2838 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2839 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2840 return 0;
2841
2842 /*
2843 * We want to share sb only if we don't specify an r/wsize or
2844 * specified r/wsize is greater than or equal to existing one.
2845 */
2846 if (new->wsize && new->wsize < old->wsize)
2847 return 0;
2848
2849 if (new->rsize && new->rsize < old->rsize)
2850 return 0;
2851
2852 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2853 return 0;
2854
2855 if (old->mnt_file_mode != new->mnt_file_mode ||
2856 old->mnt_dir_mode != new->mnt_dir_mode)
2857 return 0;
2858
2859 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2860 return 0;
2861
2862 if (old->actimeo != new->actimeo)
2863 return 0;
2864
2865 return 1;
2866 }
2867
2868 static int
2869 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2870 {
2871 struct cifs_sb_info *old = CIFS_SB(sb);
2872 struct cifs_sb_info *new = mnt_data->cifs_sb;
2873
2874 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2875 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2876 return 0;
2877 /* The prepath should be null terminated strings */
2878 if (strcmp(new->prepath, old->prepath))
2879 return 0;
2880
2881 return 1;
2882 }
2883 return 0;
2884 }
2885
2886 int
2887 cifs_match_super(struct super_block *sb, void *data)
2888 {
2889 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2890 struct smb_vol *volume_info;
2891 struct cifs_sb_info *cifs_sb;
2892 struct TCP_Server_Info *tcp_srv;
2893 struct cifs_ses *ses;
2894 struct cifs_tcon *tcon;
2895 struct tcon_link *tlink;
2896 int rc = 0;
2897
2898 spin_lock(&cifs_tcp_ses_lock);
2899 cifs_sb = CIFS_SB(sb);
2900 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2901 if (IS_ERR(tlink)) {
2902 spin_unlock(&cifs_tcp_ses_lock);
2903 return rc;
2904 }
2905 tcon = tlink_tcon(tlink);
2906 ses = tcon->ses;
2907 tcp_srv = ses->server;
2908
2909 volume_info = mnt_data->vol;
2910
2911 if (!match_server(tcp_srv, volume_info) ||
2912 !match_session(ses, volume_info) ||
2913 !match_tcon(tcon, volume_info->UNC) ||
2914 !match_prepath(sb, mnt_data)) {
2915 rc = 0;
2916 goto out;
2917 }
2918
2919 rc = compare_mount_options(sb, mnt_data);
2920 out:
2921 spin_unlock(&cifs_tcp_ses_lock);
2922 cifs_put_tlink(tlink);
2923 return rc;
2924 }
2925
2926 int
2927 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2928 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2929 struct dfs_info3_param **referrals, int remap)
2930 {
2931 char *temp_unc;
2932 int rc = 0;
2933
2934 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2935 return -ENOSYS;
2936
2937 *num_referrals = 0;
2938 *referrals = NULL;
2939
2940 if (ses->ipc_tid == 0) {
2941 temp_unc = kmalloc(2 /* for slashes */ +
2942 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2943 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2944 if (temp_unc == NULL)
2945 return -ENOMEM;
2946 temp_unc[0] = '\\';
2947 temp_unc[1] = '\\';
2948 strcpy(temp_unc + 2, ses->serverName);
2949 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2950 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2951 nls_codepage);
2952 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2953 kfree(temp_unc);
2954 }
2955 if (rc == 0)
2956 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2957 referrals, num_referrals,
2958 nls_codepage, remap);
2959 /*
2960 * BB - map targetUNCs to dfs_info3 structures, here or in
2961 * ses->server->ops->get_dfs_refer.
2962 */
2963
2964 return rc;
2965 }
2966
2967 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2968 static struct lock_class_key cifs_key[2];
2969 static struct lock_class_key cifs_slock_key[2];
2970
2971 static inline void
2972 cifs_reclassify_socket4(struct socket *sock)
2973 {
2974 struct sock *sk = sock->sk;
2975 BUG_ON(!sock_allow_reclassification(sk));
2976 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2977 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2978 }
2979
2980 static inline void
2981 cifs_reclassify_socket6(struct socket *sock)
2982 {
2983 struct sock *sk = sock->sk;
2984 BUG_ON(!sock_allow_reclassification(sk));
2985 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2986 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2987 }
2988 #else
2989 static inline void
2990 cifs_reclassify_socket4(struct socket *sock)
2991 {
2992 }
2993
2994 static inline void
2995 cifs_reclassify_socket6(struct socket *sock)
2996 {
2997 }
2998 #endif
2999
3000 /* See RFC1001 section 14 on representation of Netbios names */
3001 static void rfc1002mangle(char *target, char *source, unsigned int length)
3002 {
3003 unsigned int i, j;
3004
3005 for (i = 0, j = 0; i < (length); i++) {
3006 /* mask a nibble at a time and encode */
3007 target[j] = 'A' + (0x0F & (source[i] >> 4));
3008 target[j+1] = 'A' + (0x0F & source[i]);
3009 j += 2;
3010 }
3011
3012 }
3013
3014 static int
3015 bind_socket(struct TCP_Server_Info *server)
3016 {
3017 int rc = 0;
3018 if (server->srcaddr.ss_family != AF_UNSPEC) {
3019 /* Bind to the specified local IP address */
3020 struct socket *socket = server->ssocket;
3021 rc = socket->ops->bind(socket,
3022 (struct sockaddr *) &server->srcaddr,
3023 sizeof(server->srcaddr));
3024 if (rc < 0) {
3025 struct sockaddr_in *saddr4;
3026 struct sockaddr_in6 *saddr6;
3027 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3028 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3029 if (saddr6->sin6_family == AF_INET6)
3030 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3031 &saddr6->sin6_addr, rc);
3032 else
3033 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3034 &saddr4->sin_addr.s_addr, rc);
3035 }
3036 }
3037 return rc;
3038 }
3039
3040 static int
3041 ip_rfc1001_connect(struct TCP_Server_Info *server)
3042 {
3043 int rc = 0;
3044 /*
3045 * some servers require RFC1001 sessinit before sending
3046 * negprot - BB check reconnection in case where second
3047 * sessinit is sent but no second negprot
3048 */
3049 struct rfc1002_session_packet *ses_init_buf;
3050 struct smb_hdr *smb_buf;
3051 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3052 GFP_KERNEL);
3053 if (ses_init_buf) {
3054 ses_init_buf->trailer.session_req.called_len = 32;
3055
3056 if (server->server_RFC1001_name[0] != 0)
3057 rfc1002mangle(ses_init_buf->trailer.
3058 session_req.called_name,
3059 server->server_RFC1001_name,
3060 RFC1001_NAME_LEN_WITH_NULL);
3061 else
3062 rfc1002mangle(ses_init_buf->trailer.
3063 session_req.called_name,
3064 DEFAULT_CIFS_CALLED_NAME,
3065 RFC1001_NAME_LEN_WITH_NULL);
3066
3067 ses_init_buf->trailer.session_req.calling_len = 32;
3068
3069 /*
3070 * calling name ends in null (byte 16) from old smb
3071 * convention.
3072 */
3073 if (server->workstation_RFC1001_name[0] != 0)
3074 rfc1002mangle(ses_init_buf->trailer.
3075 session_req.calling_name,
3076 server->workstation_RFC1001_name,
3077 RFC1001_NAME_LEN_WITH_NULL);
3078 else
3079 rfc1002mangle(ses_init_buf->trailer.
3080 session_req.calling_name,
3081 "LINUX_CIFS_CLNT",
3082 RFC1001_NAME_LEN_WITH_NULL);
3083
3084 ses_init_buf->trailer.session_req.scope1 = 0;
3085 ses_init_buf->trailer.session_req.scope2 = 0;
3086 smb_buf = (struct smb_hdr *)ses_init_buf;
3087
3088 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3089 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3090 rc = smb_send(server, smb_buf, 0x44);
3091 kfree(ses_init_buf);
3092 /*
3093 * RFC1001 layer in at least one server
3094 * requires very short break before negprot
3095 * presumably because not expecting negprot
3096 * to follow so fast. This is a simple
3097 * solution that works without
3098 * complicating the code and causes no
3099 * significant slowing down on mount
3100 * for everyone else
3101 */
3102 usleep_range(1000, 2000);
3103 }
3104 /*
3105 * else the negprot may still work without this
3106 * even though malloc failed
3107 */
3108
3109 return rc;
3110 }
3111
3112 static int
3113 generic_ip_connect(struct TCP_Server_Info *server)
3114 {
3115 int rc = 0;
3116 __be16 sport;
3117 int slen, sfamily;
3118 struct socket *socket = server->ssocket;
3119 struct sockaddr *saddr;
3120
3121 saddr = (struct sockaddr *) &server->dstaddr;
3122
3123 if (server->dstaddr.ss_family == AF_INET6) {
3124 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3125 slen = sizeof(struct sockaddr_in6);
3126 sfamily = AF_INET6;
3127 } else {
3128 sport = ((struct sockaddr_in *) saddr)->sin_port;
3129 slen = sizeof(struct sockaddr_in);
3130 sfamily = AF_INET;
3131 }
3132
3133 if (socket == NULL) {
3134 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3135 IPPROTO_TCP, &socket, 1);
3136 if (rc < 0) {
3137 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3138 server->ssocket = NULL;
3139 return rc;
3140 }
3141
3142 /* BB other socket options to set KEEPALIVE, NODELAY? */
3143 cifs_dbg(FYI, "Socket created\n");
3144 server->ssocket = socket;
3145 socket->sk->sk_allocation = GFP_NOFS;
3146 if (sfamily == AF_INET6)
3147 cifs_reclassify_socket6(socket);
3148 else
3149 cifs_reclassify_socket4(socket);
3150 }
3151
3152 rc = bind_socket(server);
3153 if (rc < 0)
3154 return rc;
3155
3156 /*
3157 * Eventually check for other socket options to change from
3158 * the default. sock_setsockopt not used because it expects
3159 * user space buffer
3160 */
3161 socket->sk->sk_rcvtimeo = 7 * HZ;
3162 socket->sk->sk_sndtimeo = 5 * HZ;
3163
3164 /* make the bufsizes depend on wsize/rsize and max requests */
3165 if (server->noautotune) {
3166 if (socket->sk->sk_sndbuf < (200 * 1024))
3167 socket->sk->sk_sndbuf = 200 * 1024;
3168 if (socket->sk->sk_rcvbuf < (140 * 1024))
3169 socket->sk->sk_rcvbuf = 140 * 1024;
3170 }
3171
3172 if (server->tcp_nodelay) {
3173 int val = 1;
3174 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3175 (char *)&val, sizeof(val));
3176 if (rc)
3177 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3178 rc);
3179 }
3180
3181 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3182 socket->sk->sk_sndbuf,
3183 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3184
3185 rc = socket->ops->connect(socket, saddr, slen, 0);
3186 if (rc < 0) {
3187 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3188 sock_release(socket);
3189 server->ssocket = NULL;
3190 return rc;
3191 }
3192
3193 if (sport == htons(RFC1001_PORT))
3194 rc = ip_rfc1001_connect(server);
3195
3196 return rc;
3197 }
3198
3199 static int
3200 ip_connect(struct TCP_Server_Info *server)
3201 {
3202 __be16 *sport;
3203 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3204 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3205
3206 if (server->dstaddr.ss_family == AF_INET6)
3207 sport = &addr6->sin6_port;
3208 else
3209 sport = &addr->sin_port;
3210
3211 if (*sport == 0) {
3212 int rc;
3213
3214 /* try with 445 port at first */
3215 *sport = htons(CIFS_PORT);
3216
3217 rc = generic_ip_connect(server);
3218 if (rc >= 0)
3219 return rc;
3220
3221 /* if it failed, try with 139 port */
3222 *sport = htons(RFC1001_PORT);
3223 }
3224
3225 return generic_ip_connect(server);
3226 }
3227
3228 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3229 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3230 {
3231 /* if we are reconnecting then should we check to see if
3232 * any requested capabilities changed locally e.g. via
3233 * remount but we can not do much about it here
3234 * if they have (even if we could detect it by the following)
3235 * Perhaps we could add a backpointer to array of sb from tcon
3236 * or if we change to make all sb to same share the same
3237 * sb as NFS - then we only have one backpointer to sb.
3238 * What if we wanted to mount the server share twice once with
3239 * and once without posixacls or posix paths? */
3240 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3241
3242 if (vol_info && vol_info->no_linux_ext) {
3243 tcon->fsUnixInfo.Capability = 0;
3244 tcon->unix_ext = 0; /* Unix Extensions disabled */
3245 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3246 return;
3247 } else if (vol_info)
3248 tcon->unix_ext = 1; /* Unix Extensions supported */
3249
3250 if (tcon->unix_ext == 0) {
3251 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3252 return;
3253 }
3254
3255 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3256 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3257 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3258 /* check for reconnect case in which we do not
3259 want to change the mount behavior if we can avoid it */
3260 if (vol_info == NULL) {
3261 /* turn off POSIX ACL and PATHNAMES if not set
3262 originally at mount time */
3263 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3264 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3265 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3266 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3267 cifs_dbg(VFS, "POSIXPATH support change\n");
3268 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3269 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3270 cifs_dbg(VFS, "possible reconnect error\n");
3271 cifs_dbg(VFS, "server disabled POSIX path support\n");
3272 }
3273 }
3274
3275 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3276 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3277
3278 cap &= CIFS_UNIX_CAP_MASK;
3279 if (vol_info && vol_info->no_psx_acl)
3280 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3281 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3282 cifs_dbg(FYI, "negotiated posix acl support\n");
3283 if (cifs_sb)
3284 cifs_sb->mnt_cifs_flags |=
3285 CIFS_MOUNT_POSIXACL;
3286 }
3287
3288 if (vol_info && vol_info->posix_paths == 0)
3289 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3290 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3291 cifs_dbg(FYI, "negotiate posix pathnames\n");
3292 if (cifs_sb)
3293 cifs_sb->mnt_cifs_flags |=
3294 CIFS_MOUNT_POSIX_PATHS;
3295 }
3296
3297 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3298 #ifdef CONFIG_CIFS_DEBUG2
3299 if (cap & CIFS_UNIX_FCNTL_CAP)
3300 cifs_dbg(FYI, "FCNTL cap\n");
3301 if (cap & CIFS_UNIX_EXTATTR_CAP)
3302 cifs_dbg(FYI, "EXTATTR cap\n");
3303 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3304 cifs_dbg(FYI, "POSIX path cap\n");
3305 if (cap & CIFS_UNIX_XATTR_CAP)
3306 cifs_dbg(FYI, "XATTR cap\n");
3307 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3308 cifs_dbg(FYI, "POSIX ACL cap\n");
3309 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3310 cifs_dbg(FYI, "very large read cap\n");
3311 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3312 cifs_dbg(FYI, "very large write cap\n");
3313 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3314 cifs_dbg(FYI, "transport encryption cap\n");
3315 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3316 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3317 #endif /* CIFS_DEBUG2 */
3318 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3319 if (vol_info == NULL) {
3320 cifs_dbg(FYI, "resetting capabilities failed\n");
3321 } else
3322 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3323
3324 }
3325 }
3326 }
3327
3328 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3329 struct cifs_sb_info *cifs_sb)
3330 {
3331 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3332
3333 spin_lock_init(&cifs_sb->tlink_tree_lock);
3334 cifs_sb->tlink_tree = RB_ROOT;
3335
3336 /*
3337 * Temporarily set r/wsize for matching superblock. If we end up using
3338 * new sb then client will later negotiate it downward if needed.
3339 */
3340 cifs_sb->rsize = pvolume_info->rsize;
3341 cifs_sb->wsize = pvolume_info->wsize;
3342
3343 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3344 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3345 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3346 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3347 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3348 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3349
3350 cifs_sb->actimeo = pvolume_info->actimeo;
3351 cifs_sb->local_nls = pvolume_info->local_nls;
3352
3353 if (pvolume_info->noperm)
3354 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3355 if (pvolume_info->setuids)
3356 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3357 if (pvolume_info->setuidfromacl)
3358 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3359 if (pvolume_info->server_ino)
3360 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3361 if (pvolume_info->remap)
3362 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3363 if (pvolume_info->sfu_remap)
3364 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3365 if (pvolume_info->no_xattr)
3366 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3367 if (pvolume_info->sfu_emul)
3368 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3369 if (pvolume_info->nobrl)
3370 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3371 if (pvolume_info->nostrictsync)
3372 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3373 if (pvolume_info->mand_lock)
3374 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3375 if (pvolume_info->rwpidforward)
3376 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3377 if (pvolume_info->cifs_acl)
3378 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3379 if (pvolume_info->backupuid_specified) {
3380 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3381 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3382 }
3383 if (pvolume_info->backupgid_specified) {
3384 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3385 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3386 }
3387 if (pvolume_info->override_uid)
3388 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3389 if (pvolume_info->override_gid)
3390 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3391 if (pvolume_info->dynperm)
3392 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3393 if (pvolume_info->fsc)
3394 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3395 if (pvolume_info->multiuser)
3396 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3397 CIFS_MOUNT_NO_PERM);
3398 if (pvolume_info->strict_io)
3399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3400 if (pvolume_info->direct_io) {
3401 cifs_dbg(FYI, "mounting share using direct i/o\n");
3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3403 }
3404 if (pvolume_info->mfsymlinks) {
3405 if (pvolume_info->sfu_emul) {
3406 /*
3407 * Our SFU ("Services for Unix" emulation does not allow
3408 * creating symlinks but does allow reading existing SFU
3409 * symlinks (it does allow both creating and reading SFU
3410 * style mknod and FIFOs though). When "mfsymlinks" and
3411 * "sfu" are both enabled at the same time, it allows
3412 * reading both types of symlinks, but will only create
3413 * them with mfsymlinks format. This allows better
3414 * Apple compatibility (probably better for Samba too)
3415 * while still recognizing old Windows style symlinks.
3416 */
3417 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3418 }
3419 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3420 }
3421
3422 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3423 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3424
3425 if (pvolume_info->prepath) {
3426 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3427 if (cifs_sb->prepath == NULL)
3428 return -ENOMEM;
3429 }
3430
3431 return 0;
3432 }
3433
3434 static void
3435 cleanup_volume_info_contents(struct smb_vol *volume_info)
3436 {
3437 kfree(volume_info->username);
3438 kzfree(volume_info->password);
3439 kfree(volume_info->UNC);
3440 kfree(volume_info->domainname);
3441 kfree(volume_info->iocharset);
3442 kfree(volume_info->prepath);
3443 }
3444
3445 void
3446 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3447 {
3448 if (!volume_info)
3449 return;
3450 cleanup_volume_info_contents(volume_info);
3451 kfree(volume_info);
3452 }
3453
3454
3455 #ifdef CONFIG_CIFS_DFS_UPCALL
3456 /*
3457 * cifs_build_path_to_root returns full path to root when we do not have an
3458 * exiting connection (tcon)
3459 */
3460 static char *
3461 build_unc_path_to_root(const struct smb_vol *vol,
3462 const struct cifs_sb_info *cifs_sb)
3463 {
3464 char *full_path, *pos;
3465 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3466 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3467
3468 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3469 if (full_path == NULL)
3470 return ERR_PTR(-ENOMEM);
3471
3472 strncpy(full_path, vol->UNC, unc_len);
3473 pos = full_path + unc_len;
3474
3475 if (pplen) {
3476 *pos = CIFS_DIR_SEP(cifs_sb);
3477 strncpy(pos + 1, vol->prepath, pplen);
3478 pos += pplen;
3479 }
3480
3481 *pos = '\0'; /* add trailing null */
3482 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3483 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3484 return full_path;
3485 }
3486
3487 /*
3488 * Perform a dfs referral query for a share and (optionally) prefix
3489 *
3490 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3491 * to a string containing updated options for the submount. Otherwise it
3492 * will be left untouched.
3493 *
3494 * Returns the rc from get_dfs_path to the caller, which can be used to
3495 * determine whether there were referrals.
3496 */
3497 static int
3498 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3499 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3500 int check_prefix)
3501 {
3502 int rc;
3503 unsigned int num_referrals = 0;
3504 struct dfs_info3_param *referrals = NULL;
3505 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3506
3507 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3508 if (IS_ERR(full_path))
3509 return PTR_ERR(full_path);
3510
3511 /* For DFS paths, skip the first '\' of the UNC */
3512 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3513
3514 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3515 &num_referrals, &referrals, cifs_remap(cifs_sb));
3516
3517 if (!rc && num_referrals > 0) {
3518 char *fake_devname = NULL;
3519
3520 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3521 full_path + 1, referrals,
3522 &fake_devname);
3523
3524 free_dfs_info_array(referrals, num_referrals);
3525
3526 if (IS_ERR(mdata)) {
3527 rc = PTR_ERR(mdata);
3528 mdata = NULL;
3529 } else {
3530 cleanup_volume_info_contents(volume_info);
3531 rc = cifs_setup_volume_info(volume_info, mdata,
3532 fake_devname);
3533 }
3534 kfree(fake_devname);
3535 kfree(cifs_sb->mountdata);
3536 cifs_sb->mountdata = mdata;
3537 }
3538 kfree(full_path);
3539 return rc;
3540 }
3541 #endif
3542
3543 static int
3544 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3545 const char *devname)
3546 {
3547 int rc = 0;
3548
3549 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3550 return -EINVAL;
3551
3552 if (volume_info->nullauth) {
3553 cifs_dbg(FYI, "Anonymous login\n");
3554 kfree(volume_info->username);
3555 volume_info->username = NULL;
3556 } else if (volume_info->username) {
3557 /* BB fixme parse for domain name here */
3558 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3559 } else {
3560 cifs_dbg(VFS, "No username specified\n");
3561 /* In userspace mount helper we can get user name from alternate
3562 locations such as env variables and files on disk */
3563 return -EINVAL;
3564 }
3565
3566 /* this is needed for ASCII cp to Unicode converts */
3567 if (volume_info->iocharset == NULL) {
3568 /* load_nls_default cannot return null */
3569 volume_info->local_nls = load_nls_default();
3570 } else {
3571 volume_info->local_nls = load_nls(volume_info->iocharset);
3572 if (volume_info->local_nls == NULL) {
3573 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3574 volume_info->iocharset);
3575 return -ELIBACC;
3576 }
3577 }
3578
3579 return rc;
3580 }
3581
3582 struct smb_vol *
3583 cifs_get_volume_info(char *mount_data, const char *devname)
3584 {
3585 int rc;
3586 struct smb_vol *volume_info;
3587
3588 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3589 if (!volume_info)
3590 return ERR_PTR(-ENOMEM);
3591
3592 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3593 if (rc) {
3594 cifs_cleanup_volume_info(volume_info);
3595 volume_info = ERR_PTR(rc);
3596 }
3597
3598 return volume_info;
3599 }
3600
3601 static int
3602 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3603 unsigned int xid,
3604 struct cifs_tcon *tcon,
3605 struct cifs_sb_info *cifs_sb,
3606 char *full_path)
3607 {
3608 int rc;
3609 char *s;
3610 char sep, tmp;
3611
3612 sep = CIFS_DIR_SEP(cifs_sb);
3613 s = full_path;
3614
3615 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3616 while (rc == 0) {
3617 /* skip separators */
3618 while (*s == sep)
3619 s++;
3620 if (!*s)
3621 break;
3622 /* next separator */
3623 while (*s && *s != sep)
3624 s++;
3625
3626 /*
3627 * temporarily null-terminate the path at the end of
3628 * the current component
3629 */
3630 tmp = *s;
3631 *s = 0;
3632 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3633 full_path);
3634 *s = tmp;
3635 }
3636 return rc;
3637 }
3638
3639 int
3640 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3641 {
3642 int rc;
3643 unsigned int xid;
3644 struct cifs_ses *ses;
3645 struct cifs_tcon *tcon;
3646 struct TCP_Server_Info *server;
3647 char *full_path;
3648 struct tcon_link *tlink;
3649 #ifdef CONFIG_CIFS_DFS_UPCALL
3650 int referral_walks_count = 0;
3651 #endif
3652
3653 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3654 if (rc)
3655 return rc;
3656
3657 #ifdef CONFIG_CIFS_DFS_UPCALL
3658 try_mount_again:
3659 /* cleanup activities if we're chasing a referral */
3660 if (referral_walks_count) {
3661 if (tcon)
3662 cifs_put_tcon(tcon);
3663 else if (ses)
3664 cifs_put_smb_ses(ses);
3665
3666 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3667
3668 free_xid(xid);
3669 }
3670 #endif
3671 rc = 0;
3672 tcon = NULL;
3673 ses = NULL;
3674 server = NULL;
3675 full_path = NULL;
3676 tlink = NULL;
3677
3678 xid = get_xid();
3679
3680 /* get a reference to a tcp session */
3681 server = cifs_get_tcp_session(volume_info);
3682 if (IS_ERR(server)) {
3683 rc = PTR_ERR(server);
3684 bdi_destroy(&cifs_sb->bdi);
3685 goto out;
3686 }
3687 if ((volume_info->max_credits < 20) ||
3688 (volume_info->max_credits > 60000))
3689 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3690 else
3691 server->max_credits = volume_info->max_credits;
3692 /* get a reference to a SMB session */
3693 ses = cifs_get_smb_ses(server, volume_info);
3694 if (IS_ERR(ses)) {
3695 rc = PTR_ERR(ses);
3696 ses = NULL;
3697 goto mount_fail_check;
3698 }
3699
3700 #ifdef CONFIG_CIFS_SMB2
3701 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3702 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3703 cifs_dbg(VFS, "persistent handles not supported by server\n");
3704 rc = -EOPNOTSUPP;
3705 goto mount_fail_check;
3706 }
3707 #endif /* CONFIG_CIFS_SMB2*/
3708
3709 /* search for existing tcon to this server share */
3710 tcon = cifs_get_tcon(ses, volume_info);
3711 if (IS_ERR(tcon)) {
3712 rc = PTR_ERR(tcon);
3713 tcon = NULL;
3714 goto remote_path_check;
3715 }
3716
3717 /* tell server which Unix caps we support */
3718 if (cap_unix(tcon->ses)) {
3719 /* reset of caps checks mount to see if unix extensions
3720 disabled for just this mount */
3721 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3722 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3723 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3724 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3725 rc = -EACCES;
3726 goto mount_fail_check;
3727 }
3728 } else
3729 tcon->unix_ext = 0; /* server does not support them */
3730
3731 /* do not care if a following call succeed - informational */
3732 if (!tcon->ipc && server->ops->qfs_tcon)
3733 server->ops->qfs_tcon(xid, tcon);
3734
3735 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3736 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3737
3738 /* tune readahead according to rsize */
3739 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
3740
3741 remote_path_check:
3742 #ifdef CONFIG_CIFS_DFS_UPCALL
3743 /*
3744 * Perform an unconditional check for whether there are DFS
3745 * referrals for this path without prefix, to provide support
3746 * for DFS referrals from w2k8 servers which don't seem to respond
3747 * with PATH_NOT_COVERED to requests that include the prefix.
3748 * Chase the referral if found, otherwise continue normally.
3749 */
3750 if (referral_walks_count == 0) {
3751 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3752 false);
3753 if (!refrc) {
3754 referral_walks_count++;
3755 goto try_mount_again;
3756 }
3757 }
3758 #endif
3759
3760 /* check if a whole path is not remote */
3761 if (!rc && tcon) {
3762 if (!server->ops->is_path_accessible) {
3763 rc = -ENOSYS;
3764 goto mount_fail_check;
3765 }
3766 /*
3767 * cifs_build_path_to_root works only when we have a valid tcon
3768 */
3769 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3770 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3771 if (full_path == NULL) {
3772 rc = -ENOMEM;
3773 goto mount_fail_check;
3774 }
3775 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3776 full_path);
3777 if (rc != 0 && rc != -EREMOTE) {
3778 kfree(full_path);
3779 goto mount_fail_check;
3780 }
3781
3782 if (rc != -EREMOTE) {
3783 rc = cifs_are_all_path_components_accessible(server,
3784 xid, tcon, cifs_sb,
3785 full_path);
3786 if (rc != 0) {
3787 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3788 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3789 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3790 rc = 0;
3791 }
3792 }
3793 kfree(full_path);
3794 }
3795
3796 /* get referral if needed */
3797 if (rc == -EREMOTE) {
3798 #ifdef CONFIG_CIFS_DFS_UPCALL
3799 if (referral_walks_count > MAX_NESTED_LINKS) {
3800 /*
3801 * BB: when we implement proper loop detection,
3802 * we will remove this check. But now we need it
3803 * to prevent an indefinite loop if 'DFS tree' is
3804 * misconfigured (i.e. has loops).
3805 */
3806 rc = -ELOOP;
3807 goto mount_fail_check;
3808 }
3809
3810 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3811
3812 if (!rc) {
3813 referral_walks_count++;
3814 goto try_mount_again;
3815 }
3816 goto mount_fail_check;
3817 #else /* No DFS support, return error on mount */
3818 rc = -EOPNOTSUPP;
3819 #endif
3820 }
3821
3822 if (rc)
3823 goto mount_fail_check;
3824
3825 /* now, hang the tcon off of the superblock */
3826 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3827 if (tlink == NULL) {
3828 rc = -ENOMEM;
3829 goto mount_fail_check;
3830 }
3831
3832 tlink->tl_uid = ses->linux_uid;
3833 tlink->tl_tcon = tcon;
3834 tlink->tl_time = jiffies;
3835 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3836 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3837
3838 cifs_sb->master_tlink = tlink;
3839 spin_lock(&cifs_sb->tlink_tree_lock);
3840 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3841 spin_unlock(&cifs_sb->tlink_tree_lock);
3842
3843 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3844 TLINK_IDLE_EXPIRE);
3845
3846 mount_fail_check:
3847 /* on error free sesinfo and tcon struct if needed */
3848 if (rc) {
3849 /* If find_unc succeeded then rc == 0 so we can not end */
3850 /* up accidentally freeing someone elses tcon struct */
3851 if (tcon)
3852 cifs_put_tcon(tcon);
3853 else if (ses)
3854 cifs_put_smb_ses(ses);
3855 else
3856 cifs_put_tcp_session(server, 0);
3857 bdi_destroy(&cifs_sb->bdi);
3858 }
3859
3860 out:
3861 free_xid(xid);
3862 return rc;
3863 }
3864
3865 /*
3866 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3867 * pointer may be NULL.
3868 */
3869 int
3870 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3871 const char *tree, struct cifs_tcon *tcon,
3872 const struct nls_table *nls_codepage)
3873 {
3874 struct smb_hdr *smb_buffer;
3875 struct smb_hdr *smb_buffer_response;
3876 TCONX_REQ *pSMB;
3877 TCONX_RSP *pSMBr;
3878 unsigned char *bcc_ptr;
3879 int rc = 0;
3880 int length;
3881 __u16 bytes_left, count;
3882
3883 if (ses == NULL)
3884 return -EIO;
3885
3886 smb_buffer = cifs_buf_get();
3887 if (smb_buffer == NULL)
3888 return -ENOMEM;
3889
3890 smb_buffer_response = smb_buffer;
3891
3892 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3893 NULL /*no tid */ , 4 /*wct */ );
3894
3895 smb_buffer->Mid = get_next_mid(ses->server);
3896 smb_buffer->Uid = ses->Suid;
3897 pSMB = (TCONX_REQ *) smb_buffer;
3898 pSMBr = (TCONX_RSP *) smb_buffer_response;
3899
3900 pSMB->AndXCommand = 0xFF;
3901 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3902 bcc_ptr = &pSMB->Password[0];
3903 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3904 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3905 *bcc_ptr = 0; /* password is null byte */
3906 bcc_ptr++; /* skip password */
3907 /* already aligned so no need to do it below */
3908 } else {
3909 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3910 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3911 specified as required (when that support is added to
3912 the vfs in the future) as only NTLM or the much
3913 weaker LANMAN (which we do not send by default) is accepted
3914 by Samba (not sure whether other servers allow
3915 NTLMv2 password here) */
3916 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3917 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3918 (ses->sectype == LANMAN))
3919 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3920 ses->server->sec_mode &
3921 SECMODE_PW_ENCRYPT ? true : false,
3922 bcc_ptr);
3923 else
3924 #endif /* CIFS_WEAK_PW_HASH */
3925 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3926 bcc_ptr, nls_codepage);
3927 if (rc) {
3928 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3929 __func__, rc);
3930 cifs_buf_release(smb_buffer);
3931 return rc;
3932 }
3933
3934 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3935 if (ses->capabilities & CAP_UNICODE) {
3936 /* must align unicode strings */
3937 *bcc_ptr = 0; /* null byte password */
3938 bcc_ptr++;
3939 }
3940 }
3941
3942 if (ses->server->sign)
3943 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3944
3945 if (ses->capabilities & CAP_STATUS32) {
3946 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3947 }
3948 if (ses->capabilities & CAP_DFS) {
3949 smb_buffer->Flags2 |= SMBFLG2_DFS;
3950 }
3951 if (ses->capabilities & CAP_UNICODE) {
3952 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3953 length =
3954 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3955 6 /* max utf8 char length in bytes */ *
3956 (/* server len*/ + 256 /* share len */), nls_codepage);
3957 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3958 bcc_ptr += 2; /* skip trailing null */
3959 } else { /* ASCII */
3960 strcpy(bcc_ptr, tree);
3961 bcc_ptr += strlen(tree) + 1;
3962 }
3963 strcpy(bcc_ptr, "?????");
3964 bcc_ptr += strlen("?????");
3965 bcc_ptr += 1;
3966 count = bcc_ptr - &pSMB->Password[0];
3967 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3968 pSMB->hdr.smb_buf_length) + count);
3969 pSMB->ByteCount = cpu_to_le16(count);
3970
3971 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3972 0);
3973
3974 /* above now done in SendReceive */
3975 if ((rc == 0) && (tcon != NULL)) {
3976 bool is_unicode;
3977
3978 tcon->tidStatus = CifsGood;
3979 tcon->need_reconnect = false;
3980 tcon->tid = smb_buffer_response->Tid;
3981 bcc_ptr = pByteArea(smb_buffer_response);
3982 bytes_left = get_bcc(smb_buffer_response);
3983 length = strnlen(bcc_ptr, bytes_left - 2);
3984 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3985 is_unicode = true;
3986 else
3987 is_unicode = false;
3988
3989
3990 /* skip service field (NB: this field is always ASCII) */
3991 if (length == 3) {
3992 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3993 (bcc_ptr[2] == 'C')) {
3994 cifs_dbg(FYI, "IPC connection\n");
3995 tcon->ipc = 1;
3996 }
3997 } else if (length == 2) {
3998 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3999 /* the most common case */
4000 cifs_dbg(FYI, "disk share connection\n");
4001 }
4002 }
4003 bcc_ptr += length + 1;
4004 bytes_left -= (length + 1);
4005 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4006
4007 /* mostly informational -- no need to fail on error here */
4008 kfree(tcon->nativeFileSystem);
4009 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4010 bytes_left, is_unicode,
4011 nls_codepage);
4012
4013 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4014
4015 if ((smb_buffer_response->WordCount == 3) ||
4016 (smb_buffer_response->WordCount == 7))
4017 /* field is in same location */
4018 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4019 else
4020 tcon->Flags = 0;
4021 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4022 } else if ((rc == 0) && tcon == NULL) {
4023 /* all we need to save for IPC$ connection */
4024 ses->ipc_tid = smb_buffer_response->Tid;
4025 }
4026
4027 cifs_buf_release(smb_buffer);
4028 return rc;
4029 }
4030
4031 static void delayed_free(struct rcu_head *p)
4032 {
4033 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4034 unload_nls(sbi->local_nls);
4035 kfree(sbi);
4036 }
4037
4038 void
4039 cifs_umount(struct cifs_sb_info *cifs_sb)
4040 {
4041 struct rb_root *root = &cifs_sb->tlink_tree;
4042 struct rb_node *node;
4043 struct tcon_link *tlink;
4044
4045 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4046
4047 spin_lock(&cifs_sb->tlink_tree_lock);
4048 while ((node = rb_first(root))) {
4049 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4050 cifs_get_tlink(tlink);
4051 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4052 rb_erase(node, root);
4053
4054 spin_unlock(&cifs_sb->tlink_tree_lock);
4055 cifs_put_tlink(tlink);
4056 spin_lock(&cifs_sb->tlink_tree_lock);
4057 }
4058 spin_unlock(&cifs_sb->tlink_tree_lock);
4059
4060 bdi_destroy(&cifs_sb->bdi);
4061 kfree(cifs_sb->mountdata);
4062 kfree(cifs_sb->prepath);
4063 call_rcu(&cifs_sb->rcu, delayed_free);
4064 }
4065
4066 int
4067 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4068 {
4069 int rc = 0;
4070 struct TCP_Server_Info *server = ses->server;
4071
4072 if (!server->ops->need_neg || !server->ops->negotiate)
4073 return -ENOSYS;
4074
4075 /* only send once per connect */
4076 if (!server->ops->need_neg(server))
4077 return 0;
4078
4079 set_credits(server, 1);
4080
4081 rc = server->ops->negotiate(xid, ses);
4082 if (rc == 0) {
4083 spin_lock(&GlobalMid_Lock);
4084 if (server->tcpStatus == CifsNeedNegotiate)
4085 server->tcpStatus = CifsGood;
4086 else
4087 rc = -EHOSTDOWN;
4088 spin_unlock(&GlobalMid_Lock);
4089 }
4090
4091 return rc;
4092 }
4093
4094 int
4095 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4096 struct nls_table *nls_info)
4097 {
4098 int rc = -ENOSYS;
4099 struct TCP_Server_Info *server = ses->server;
4100
4101 ses->capabilities = server->capabilities;
4102 if (linuxExtEnabled == 0)
4103 ses->capabilities &= (~server->vals->cap_unix);
4104
4105 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4106 server->sec_mode, server->capabilities, server->timeAdj);
4107
4108 if (server->ops->sess_setup)
4109 rc = server->ops->sess_setup(xid, ses, nls_info);
4110
4111 if (rc)
4112 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4113
4114 return rc;
4115 }
4116
4117 static int
4118 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4119 {
4120 vol->sectype = ses->sectype;
4121
4122 /* krb5 is special, since we don't need username or pw */
4123 if (vol->sectype == Kerberos)
4124 return 0;
4125
4126 return cifs_set_cifscreds(vol, ses);
4127 }
4128
4129 static struct cifs_tcon *
4130 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4131 {
4132 int rc;
4133 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4134 struct cifs_ses *ses;
4135 struct cifs_tcon *tcon = NULL;
4136 struct smb_vol *vol_info;
4137
4138 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4139 if (vol_info == NULL)
4140 return ERR_PTR(-ENOMEM);
4141
4142 vol_info->local_nls = cifs_sb->local_nls;
4143 vol_info->linux_uid = fsuid;
4144 vol_info->cred_uid = fsuid;
4145 vol_info->UNC = master_tcon->treeName;
4146 vol_info->retry = master_tcon->retry;
4147 vol_info->nocase = master_tcon->nocase;
4148 vol_info->local_lease = master_tcon->local_lease;
4149 vol_info->no_linux_ext = !master_tcon->unix_ext;
4150 vol_info->sectype = master_tcon->ses->sectype;
4151 vol_info->sign = master_tcon->ses->sign;
4152
4153 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4154 if (rc) {
4155 tcon = ERR_PTR(rc);
4156 goto out;
4157 }
4158
4159 /* get a reference for the same TCP session */
4160 spin_lock(&cifs_tcp_ses_lock);
4161 ++master_tcon->ses->server->srv_count;
4162 spin_unlock(&cifs_tcp_ses_lock);
4163
4164 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4165 if (IS_ERR(ses)) {
4166 tcon = (struct cifs_tcon *)ses;
4167 cifs_put_tcp_session(master_tcon->ses->server, 0);
4168 goto out;
4169 }
4170
4171 tcon = cifs_get_tcon(ses, vol_info);
4172 if (IS_ERR(tcon)) {
4173 cifs_put_smb_ses(ses);
4174 goto out;
4175 }
4176
4177 if (cap_unix(ses))
4178 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4179 out:
4180 kfree(vol_info->username);
4181 kfree(vol_info->password);
4182 kfree(vol_info);
4183
4184 return tcon;
4185 }
4186
4187 struct cifs_tcon *
4188 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4189 {
4190 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4191 }
4192
4193 /* find and return a tlink with given uid */
4194 static struct tcon_link *
4195 tlink_rb_search(struct rb_root *root, kuid_t uid)
4196 {
4197 struct rb_node *node = root->rb_node;
4198 struct tcon_link *tlink;
4199
4200 while (node) {
4201 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4202
4203 if (uid_gt(tlink->tl_uid, uid))
4204 node = node->rb_left;
4205 else if (uid_lt(tlink->tl_uid, uid))
4206 node = node->rb_right;
4207 else
4208 return tlink;
4209 }
4210 return NULL;
4211 }
4212
4213 /* insert a tcon_link into the tree */
4214 static void
4215 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4216 {
4217 struct rb_node **new = &(root->rb_node), *parent = NULL;
4218 struct tcon_link *tlink;
4219
4220 while (*new) {
4221 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4222 parent = *new;
4223
4224 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4225 new = &((*new)->rb_left);
4226 else
4227 new = &((*new)->rb_right);
4228 }
4229
4230 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4231 rb_insert_color(&new_tlink->tl_rbnode, root);
4232 }
4233
4234 /*
4235 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4236 * current task.
4237 *
4238 * If the superblock doesn't refer to a multiuser mount, then just return
4239 * the master tcon for the mount.
4240 *
4241 * First, search the rbtree for an existing tcon for this fsuid. If one
4242 * exists, then check to see if it's pending construction. If it is then wait
4243 * for construction to complete. Once it's no longer pending, check to see if
4244 * it failed and either return an error or retry construction, depending on
4245 * the timeout.
4246 *
4247 * If one doesn't exist then insert a new tcon_link struct into the tree and
4248 * try to construct a new one.
4249 */
4250 struct tcon_link *
4251 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4252 {
4253 int ret;
4254 kuid_t fsuid = current_fsuid();
4255 struct tcon_link *tlink, *newtlink;
4256
4257 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4258 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4259
4260 spin_lock(&cifs_sb->tlink_tree_lock);
4261 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4262 if (tlink)
4263 cifs_get_tlink(tlink);
4264 spin_unlock(&cifs_sb->tlink_tree_lock);
4265
4266 if (tlink == NULL) {
4267 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4268 if (newtlink == NULL)
4269 return ERR_PTR(-ENOMEM);
4270 newtlink->tl_uid = fsuid;
4271 newtlink->tl_tcon = ERR_PTR(-EACCES);
4272 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4273 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4274 cifs_get_tlink(newtlink);
4275
4276 spin_lock(&cifs_sb->tlink_tree_lock);
4277 /* was one inserted after previous search? */
4278 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4279 if (tlink) {
4280 cifs_get_tlink(tlink);
4281 spin_unlock(&cifs_sb->tlink_tree_lock);
4282 kfree(newtlink);
4283 goto wait_for_construction;
4284 }
4285 tlink = newtlink;
4286 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4287 spin_unlock(&cifs_sb->tlink_tree_lock);
4288 } else {
4289 wait_for_construction:
4290 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4291 TASK_INTERRUPTIBLE);
4292 if (ret) {
4293 cifs_put_tlink(tlink);
4294 return ERR_PTR(-ERESTARTSYS);
4295 }
4296
4297 /* if it's good, return it */
4298 if (!IS_ERR(tlink->tl_tcon))
4299 return tlink;
4300
4301 /* return error if we tried this already recently */
4302 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4303 cifs_put_tlink(tlink);
4304 return ERR_PTR(-EACCES);
4305 }
4306
4307 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4308 goto wait_for_construction;
4309 }
4310
4311 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4312 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4313 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4314
4315 if (IS_ERR(tlink->tl_tcon)) {
4316 cifs_put_tlink(tlink);
4317 return ERR_PTR(-EACCES);
4318 }
4319
4320 return tlink;
4321 }
4322
4323 /*
4324 * periodic workqueue job that scans tcon_tree for a superblock and closes
4325 * out tcons.
4326 */
4327 static void
4328 cifs_prune_tlinks(struct work_struct *work)
4329 {
4330 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4331 prune_tlinks.work);
4332 struct rb_root *root = &cifs_sb->tlink_tree;
4333 struct rb_node *node = rb_first(root);
4334 struct rb_node *tmp;
4335 struct tcon_link *tlink;
4336
4337 /*
4338 * Because we drop the spinlock in the loop in order to put the tlink
4339 * it's not guarded against removal of links from the tree. The only
4340 * places that remove entries from the tree are this function and
4341 * umounts. Because this function is non-reentrant and is canceled
4342 * before umount can proceed, this is safe.
4343 */
4344 spin_lock(&cifs_sb->tlink_tree_lock);
4345 node = rb_first(root);
4346 while (node != NULL) {
4347 tmp = node;
4348 node = rb_next(tmp);
4349 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4350
4351 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4352 atomic_read(&tlink->tl_count) != 0 ||
4353 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4354 continue;
4355
4356 cifs_get_tlink(tlink);
4357 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4358 rb_erase(tmp, root);
4359
4360 spin_unlock(&cifs_sb->tlink_tree_lock);
4361 cifs_put_tlink(tlink);
4362 spin_lock(&cifs_sb->tlink_tree_lock);
4363 }
4364 spin_unlock(&cifs_sb->tlink_tree_lock);
4365
4366 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4367 TLINK_IDLE_EXPIRE);
4368 }
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