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Merge branch 'xtensa-sim-params' into xtensa-fixes
[mirror_ubuntu-artful-kernel.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/sched/signal.h>
25 #include <linux/list.h>
26 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/mempool.h>
32 #include <linux/delay.h>
33 #include <linux/completion.h>
34 #include <linux/kthread.h>
35 #include <linux/pagevec.h>
36 #include <linux/freezer.h>
37 #include <linux/namei.h>
38 #include <linux/uaccess.h>
39 #include <asm/processor.h>
40 #include <linux/inet.h>
41 #include <linux/module.h>
42 #include <keys/user-type.h>
43 #include <net/ipv6.h>
44 #include <linux/parser.h>
45 #include <linux/bvec.h>
46
47 #include "cifspdu.h"
48 #include "cifsglob.h"
49 #include "cifsproto.h"
50 #include "cifs_unicode.h"
51 #include "cifs_debug.h"
52 #include "cifs_fs_sb.h"
53 #include "ntlmssp.h"
54 #include "nterr.h"
55 #include "rfc1002pdu.h"
56 #include "fscache.h"
57 #ifdef CONFIG_CIFS_SMB2
58 #include "smb2proto.h"
59 #endif
60
61 #define CIFS_PORT 445
62 #define RFC1001_PORT 139
63
64 extern mempool_t *cifs_req_poolp;
65
66 /* FIXME: should these be tunable? */
67 #define TLINK_ERROR_EXPIRE (1 * HZ)
68 #define TLINK_IDLE_EXPIRE (600 * HZ)
69
70 enum {
71 /* Mount options that take no arguments */
72 Opt_user_xattr, Opt_nouser_xattr,
73 Opt_forceuid, Opt_noforceuid,
74 Opt_forcegid, Opt_noforcegid,
75 Opt_noblocksend, Opt_noautotune,
76 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
77 Opt_mapposix, Opt_nomapposix,
78 Opt_mapchars, Opt_nomapchars, Opt_sfu,
79 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
80 Opt_noposixpaths, Opt_nounix,
81 Opt_nocase,
82 Opt_brl, Opt_nobrl,
83 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
84 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
85 Opt_nohard, Opt_nosoft,
86 Opt_nointr, Opt_intr,
87 Opt_nostrictsync, Opt_strictsync,
88 Opt_serverino, Opt_noserverino,
89 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
90 Opt_acl, Opt_noacl, Opt_locallease,
91 Opt_sign, Opt_seal, Opt_noac,
92 Opt_fsc, Opt_mfsymlinks,
93 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
94 Opt_persistent, Opt_nopersistent,
95 Opt_resilient, Opt_noresilient,
96 Opt_domainauto,
97
98 /* Mount options which take numeric value */
99 Opt_backupuid, Opt_backupgid, Opt_uid,
100 Opt_cruid, Opt_gid, Opt_file_mode,
101 Opt_dirmode, Opt_port,
102 Opt_rsize, Opt_wsize, Opt_actimeo,
103 Opt_echo_interval, Opt_max_credits,
104 Opt_snapshot,
105
106 /* Mount options which take string value */
107 Opt_user, Opt_pass, Opt_ip,
108 Opt_domain, Opt_srcaddr, Opt_iocharset,
109 Opt_netbiosname, Opt_servern,
110 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
111
112 /* Mount options to be ignored */
113 Opt_ignore,
114
115 /* Options which could be blank */
116 Opt_blank_pass,
117 Opt_blank_user,
118 Opt_blank_ip,
119
120 Opt_err
121 };
122
123 static const match_table_t cifs_mount_option_tokens = {
124
125 { Opt_user_xattr, "user_xattr" },
126 { Opt_nouser_xattr, "nouser_xattr" },
127 { Opt_forceuid, "forceuid" },
128 { Opt_noforceuid, "noforceuid" },
129 { Opt_forcegid, "forcegid" },
130 { Opt_noforcegid, "noforcegid" },
131 { Opt_noblocksend, "noblocksend" },
132 { Opt_noautotune, "noautotune" },
133 { Opt_hard, "hard" },
134 { Opt_soft, "soft" },
135 { Opt_perm, "perm" },
136 { Opt_noperm, "noperm" },
137 { Opt_mapchars, "mapchars" }, /* SFU style */
138 { Opt_nomapchars, "nomapchars" },
139 { Opt_mapposix, "mapposix" }, /* SFM style */
140 { Opt_nomapposix, "nomapposix" },
141 { Opt_sfu, "sfu" },
142 { Opt_nosfu, "nosfu" },
143 { Opt_nodfs, "nodfs" },
144 { Opt_posixpaths, "posixpaths" },
145 { Opt_noposixpaths, "noposixpaths" },
146 { Opt_nounix, "nounix" },
147 { Opt_nounix, "nolinux" },
148 { Opt_nocase, "nocase" },
149 { Opt_nocase, "ignorecase" },
150 { Opt_brl, "brl" },
151 { Opt_nobrl, "nobrl" },
152 { Opt_nobrl, "nolock" },
153 { Opt_forcemandatorylock, "forcemandatorylock" },
154 { Opt_forcemandatorylock, "forcemand" },
155 { Opt_setuids, "setuids" },
156 { Opt_nosetuids, "nosetuids" },
157 { Opt_setuidfromacl, "idsfromsid" },
158 { Opt_dynperm, "dynperm" },
159 { Opt_nodynperm, "nodynperm" },
160 { Opt_nohard, "nohard" },
161 { Opt_nosoft, "nosoft" },
162 { Opt_nointr, "nointr" },
163 { Opt_intr, "intr" },
164 { Opt_nostrictsync, "nostrictsync" },
165 { Opt_strictsync, "strictsync" },
166 { Opt_serverino, "serverino" },
167 { Opt_noserverino, "noserverino" },
168 { Opt_rwpidforward, "rwpidforward" },
169 { Opt_cifsacl, "cifsacl" },
170 { Opt_nocifsacl, "nocifsacl" },
171 { Opt_acl, "acl" },
172 { Opt_noacl, "noacl" },
173 { Opt_locallease, "locallease" },
174 { Opt_sign, "sign" },
175 { Opt_seal, "seal" },
176 { Opt_noac, "noac" },
177 { Opt_fsc, "fsc" },
178 { Opt_mfsymlinks, "mfsymlinks" },
179 { Opt_multiuser, "multiuser" },
180 { Opt_sloppy, "sloppy" },
181 { Opt_nosharesock, "nosharesock" },
182 { Opt_persistent, "persistenthandles"},
183 { Opt_nopersistent, "nopersistenthandles"},
184 { Opt_resilient, "resilienthandles"},
185 { Opt_noresilient, "noresilienthandles"},
186 { Opt_domainauto, "domainauto"},
187
188 { Opt_backupuid, "backupuid=%s" },
189 { Opt_backupgid, "backupgid=%s" },
190 { Opt_uid, "uid=%s" },
191 { Opt_cruid, "cruid=%s" },
192 { Opt_gid, "gid=%s" },
193 { Opt_file_mode, "file_mode=%s" },
194 { Opt_dirmode, "dirmode=%s" },
195 { Opt_dirmode, "dir_mode=%s" },
196 { Opt_port, "port=%s" },
197 { Opt_rsize, "rsize=%s" },
198 { Opt_wsize, "wsize=%s" },
199 { Opt_actimeo, "actimeo=%s" },
200 { Opt_echo_interval, "echo_interval=%s" },
201 { Opt_max_credits, "max_credits=%s" },
202 { Opt_snapshot, "snapshot=%s" },
203
204 { Opt_blank_user, "user=" },
205 { Opt_blank_user, "username=" },
206 { Opt_user, "user=%s" },
207 { Opt_user, "username=%s" },
208 { Opt_blank_pass, "pass=" },
209 { Opt_blank_pass, "password=" },
210 { Opt_pass, "pass=%s" },
211 { Opt_pass, "password=%s" },
212 { Opt_blank_ip, "ip=" },
213 { Opt_blank_ip, "addr=" },
214 { Opt_ip, "ip=%s" },
215 { Opt_ip, "addr=%s" },
216 { Opt_ignore, "unc=%s" },
217 { Opt_ignore, "target=%s" },
218 { Opt_ignore, "path=%s" },
219 { Opt_domain, "dom=%s" },
220 { Opt_domain, "domain=%s" },
221 { Opt_domain, "workgroup=%s" },
222 { Opt_srcaddr, "srcaddr=%s" },
223 { Opt_ignore, "prefixpath=%s" },
224 { Opt_iocharset, "iocharset=%s" },
225 { Opt_netbiosname, "netbiosname=%s" },
226 { Opt_servern, "servern=%s" },
227 { Opt_ver, "ver=%s" },
228 { Opt_vers, "vers=%s" },
229 { Opt_sec, "sec=%s" },
230 { Opt_cache, "cache=%s" },
231
232 { Opt_ignore, "cred" },
233 { Opt_ignore, "credentials" },
234 { Opt_ignore, "cred=%s" },
235 { Opt_ignore, "credentials=%s" },
236 { Opt_ignore, "guest" },
237 { Opt_ignore, "rw" },
238 { Opt_ignore, "ro" },
239 { Opt_ignore, "suid" },
240 { Opt_ignore, "nosuid" },
241 { Opt_ignore, "exec" },
242 { Opt_ignore, "noexec" },
243 { Opt_ignore, "nodev" },
244 { Opt_ignore, "noauto" },
245 { Opt_ignore, "dev" },
246 { Opt_ignore, "mand" },
247 { Opt_ignore, "nomand" },
248 { Opt_ignore, "_netdev" },
249
250 { Opt_err, NULL }
251 };
252
253 enum {
254 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
255 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
256 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
257 Opt_sec_ntlmv2i, Opt_sec_lanman,
258 Opt_sec_none,
259
260 Opt_sec_err
261 };
262
263 static const match_table_t cifs_secflavor_tokens = {
264 { Opt_sec_krb5, "krb5" },
265 { Opt_sec_krb5i, "krb5i" },
266 { Opt_sec_krb5p, "krb5p" },
267 { Opt_sec_ntlmsspi, "ntlmsspi" },
268 { Opt_sec_ntlmssp, "ntlmssp" },
269 { Opt_ntlm, "ntlm" },
270 { Opt_sec_ntlmi, "ntlmi" },
271 { Opt_sec_ntlmv2, "nontlm" },
272 { Opt_sec_ntlmv2, "ntlmv2" },
273 { Opt_sec_ntlmv2i, "ntlmv2i" },
274 { Opt_sec_lanman, "lanman" },
275 { Opt_sec_none, "none" },
276
277 { Opt_sec_err, NULL }
278 };
279
280 /* cache flavors */
281 enum {
282 Opt_cache_loose,
283 Opt_cache_strict,
284 Opt_cache_none,
285 Opt_cache_err
286 };
287
288 static const match_table_t cifs_cacheflavor_tokens = {
289 { Opt_cache_loose, "loose" },
290 { Opt_cache_strict, "strict" },
291 { Opt_cache_none, "none" },
292 { Opt_cache_err, NULL }
293 };
294
295 static const match_table_t cifs_smb_version_tokens = {
296 { Smb_1, SMB1_VERSION_STRING },
297 { Smb_20, SMB20_VERSION_STRING},
298 { Smb_21, SMB21_VERSION_STRING },
299 { Smb_30, SMB30_VERSION_STRING },
300 { Smb_302, SMB302_VERSION_STRING },
301 #ifdef CONFIG_CIFS_SMB311
302 { Smb_311, SMB311_VERSION_STRING },
303 { Smb_311, ALT_SMB311_VERSION_STRING },
304 #endif /* SMB311 */
305 { Smb_version_err, NULL }
306 };
307
308 static int ip_connect(struct TCP_Server_Info *server);
309 static int generic_ip_connect(struct TCP_Server_Info *server);
310 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
311 static void cifs_prune_tlinks(struct work_struct *work);
312 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
313 const char *devname);
314
315 /*
316 * cifs tcp session reconnection
317 *
318 * mark tcp session as reconnecting so temporarily locked
319 * mark all smb sessions as reconnecting for tcp session
320 * reconnect tcp session
321 * wake up waiters on reconnection? - (not needed currently)
322 */
323 int
324 cifs_reconnect(struct TCP_Server_Info *server)
325 {
326 int rc = 0;
327 struct list_head *tmp, *tmp2;
328 struct cifs_ses *ses;
329 struct cifs_tcon *tcon;
330 struct mid_q_entry *mid_entry;
331 struct list_head retry_list;
332
333 spin_lock(&GlobalMid_Lock);
334 if (server->tcpStatus == CifsExiting) {
335 /* the demux thread will exit normally
336 next time through the loop */
337 spin_unlock(&GlobalMid_Lock);
338 return rc;
339 } else
340 server->tcpStatus = CifsNeedReconnect;
341 spin_unlock(&GlobalMid_Lock);
342 server->maxBuf = 0;
343 #ifdef CONFIG_CIFS_SMB2
344 server->max_read = 0;
345 #endif
346
347 cifs_dbg(FYI, "Reconnecting tcp session\n");
348
349 /* before reconnecting the tcp session, mark the smb session (uid)
350 and the tid bad so they are not used until reconnected */
351 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
352 __func__);
353 spin_lock(&cifs_tcp_ses_lock);
354 list_for_each(tmp, &server->smb_ses_list) {
355 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
356 ses->need_reconnect = true;
357 ses->ipc_tid = 0;
358 list_for_each(tmp2, &ses->tcon_list) {
359 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
360 tcon->need_reconnect = true;
361 }
362 }
363 spin_unlock(&cifs_tcp_ses_lock);
364
365 /* do not want to be sending data on a socket we are freeing */
366 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
367 mutex_lock(&server->srv_mutex);
368 if (server->ssocket) {
369 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
370 server->ssocket->state, server->ssocket->flags);
371 kernel_sock_shutdown(server->ssocket, SHUT_WR);
372 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
373 server->ssocket->state, server->ssocket->flags);
374 sock_release(server->ssocket);
375 server->ssocket = NULL;
376 }
377 server->sequence_number = 0;
378 server->session_estab = false;
379 kfree(server->session_key.response);
380 server->session_key.response = NULL;
381 server->session_key.len = 0;
382 server->lstrp = jiffies;
383
384 /* mark submitted MIDs for retry and issue callback */
385 INIT_LIST_HEAD(&retry_list);
386 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
387 spin_lock(&GlobalMid_Lock);
388 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
389 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
390 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
391 mid_entry->mid_state = MID_RETRY_NEEDED;
392 list_move(&mid_entry->qhead, &retry_list);
393 }
394 spin_unlock(&GlobalMid_Lock);
395 mutex_unlock(&server->srv_mutex);
396
397 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
398 list_for_each_safe(tmp, tmp2, &retry_list) {
399 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
400 list_del_init(&mid_entry->qhead);
401 mid_entry->callback(mid_entry);
402 }
403
404 do {
405 try_to_freeze();
406
407 /* we should try only the port we connected to before */
408 mutex_lock(&server->srv_mutex);
409 rc = generic_ip_connect(server);
410 if (rc) {
411 cifs_dbg(FYI, "reconnect error %d\n", rc);
412 mutex_unlock(&server->srv_mutex);
413 msleep(3000);
414 } else {
415 atomic_inc(&tcpSesReconnectCount);
416 spin_lock(&GlobalMid_Lock);
417 if (server->tcpStatus != CifsExiting)
418 server->tcpStatus = CifsNeedNegotiate;
419 spin_unlock(&GlobalMid_Lock);
420 mutex_unlock(&server->srv_mutex);
421 }
422 } while (server->tcpStatus == CifsNeedReconnect);
423
424 if (server->tcpStatus == CifsNeedNegotiate)
425 mod_delayed_work(cifsiod_wq, &server->echo, 0);
426
427 return rc;
428 }
429
430 static void
431 cifs_echo_request(struct work_struct *work)
432 {
433 int rc;
434 struct TCP_Server_Info *server = container_of(work,
435 struct TCP_Server_Info, echo.work);
436 unsigned long echo_interval;
437
438 /*
439 * If we need to renegotiate, set echo interval to zero to
440 * immediately call echo service where we can renegotiate.
441 */
442 if (server->tcpStatus == CifsNeedNegotiate)
443 echo_interval = 0;
444 else
445 echo_interval = server->echo_interval;
446
447 /*
448 * We cannot send an echo if it is disabled.
449 * Also, no need to ping if we got a response recently.
450 */
451
452 if (server->tcpStatus == CifsNeedReconnect ||
453 server->tcpStatus == CifsExiting ||
454 server->tcpStatus == CifsNew ||
455 (server->ops->can_echo && !server->ops->can_echo(server)) ||
456 time_before(jiffies, server->lstrp + echo_interval - HZ))
457 goto requeue_echo;
458
459 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
460 if (rc)
461 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
462 server->hostname);
463
464 requeue_echo:
465 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
466 }
467
468 static bool
469 allocate_buffers(struct TCP_Server_Info *server)
470 {
471 if (!server->bigbuf) {
472 server->bigbuf = (char *)cifs_buf_get();
473 if (!server->bigbuf) {
474 cifs_dbg(VFS, "No memory for large SMB response\n");
475 msleep(3000);
476 /* retry will check if exiting */
477 return false;
478 }
479 } else if (server->large_buf) {
480 /* we are reusing a dirty large buf, clear its start */
481 memset(server->bigbuf, 0, HEADER_SIZE(server));
482 }
483
484 if (!server->smallbuf) {
485 server->smallbuf = (char *)cifs_small_buf_get();
486 if (!server->smallbuf) {
487 cifs_dbg(VFS, "No memory for SMB response\n");
488 msleep(1000);
489 /* retry will check if exiting */
490 return false;
491 }
492 /* beginning of smb buffer is cleared in our buf_get */
493 } else {
494 /* if existing small buf clear beginning */
495 memset(server->smallbuf, 0, HEADER_SIZE(server));
496 }
497
498 return true;
499 }
500
501 static bool
502 server_unresponsive(struct TCP_Server_Info *server)
503 {
504 /*
505 * We need to wait 2 echo intervals to make sure we handle such
506 * situations right:
507 * 1s client sends a normal SMB request
508 * 2s client gets a response
509 * 30s echo workqueue job pops, and decides we got a response recently
510 * and don't need to send another
511 * ...
512 * 65s kernel_recvmsg times out, and we see that we haven't gotten
513 * a response in >60s.
514 */
515 if (server->tcpStatus == CifsGood &&
516 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
517 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
518 server->hostname, (2 * server->echo_interval) / HZ);
519 cifs_reconnect(server);
520 wake_up(&server->response_q);
521 return true;
522 }
523
524 return false;
525 }
526
527 static int
528 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
529 {
530 int length = 0;
531 int total_read;
532
533 smb_msg->msg_control = NULL;
534 smb_msg->msg_controllen = 0;
535
536 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
537 try_to_freeze();
538
539 if (server_unresponsive(server))
540 return -ECONNABORTED;
541
542 length = sock_recvmsg(server->ssocket, smb_msg, 0);
543
544 if (server->tcpStatus == CifsExiting)
545 return -ESHUTDOWN;
546
547 if (server->tcpStatus == CifsNeedReconnect) {
548 cifs_reconnect(server);
549 return -ECONNABORTED;
550 }
551
552 if (length == -ERESTARTSYS ||
553 length == -EAGAIN ||
554 length == -EINTR) {
555 /*
556 * Minimum sleep to prevent looping, allowing socket
557 * to clear and app threads to set tcpStatus
558 * CifsNeedReconnect if server hung.
559 */
560 usleep_range(1000, 2000);
561 length = 0;
562 continue;
563 }
564
565 if (length <= 0) {
566 cifs_dbg(FYI, "Received no data or error: %d\n", length);
567 cifs_reconnect(server);
568 return -ECONNABORTED;
569 }
570 }
571 return total_read;
572 }
573
574 int
575 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
576 unsigned int to_read)
577 {
578 struct msghdr smb_msg;
579 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
580 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
581
582 return cifs_readv_from_socket(server, &smb_msg);
583 }
584
585 int
586 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
587 unsigned int to_read)
588 {
589 struct msghdr smb_msg;
590 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
591 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
592 return cifs_readv_from_socket(server, &smb_msg);
593 }
594
595 static bool
596 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
597 {
598 /*
599 * The first byte big endian of the length field,
600 * is actually not part of the length but the type
601 * with the most common, zero, as regular data.
602 */
603 switch (type) {
604 case RFC1002_SESSION_MESSAGE:
605 /* Regular SMB response */
606 return true;
607 case RFC1002_SESSION_KEEP_ALIVE:
608 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
609 break;
610 case RFC1002_POSITIVE_SESSION_RESPONSE:
611 cifs_dbg(FYI, "RFC 1002 positive session response\n");
612 break;
613 case RFC1002_NEGATIVE_SESSION_RESPONSE:
614 /*
615 * We get this from Windows 98 instead of an error on
616 * SMB negprot response.
617 */
618 cifs_dbg(FYI, "RFC 1002 negative session response\n");
619 /* give server a second to clean up */
620 msleep(1000);
621 /*
622 * Always try 445 first on reconnect since we get NACK
623 * on some if we ever connected to port 139 (the NACK
624 * is since we do not begin with RFC1001 session
625 * initialize frame).
626 */
627 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
628 cifs_reconnect(server);
629 wake_up(&server->response_q);
630 break;
631 default:
632 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
633 cifs_reconnect(server);
634 }
635
636 return false;
637 }
638
639 void
640 dequeue_mid(struct mid_q_entry *mid, bool malformed)
641 {
642 #ifdef CONFIG_CIFS_STATS2
643 mid->when_received = jiffies;
644 #endif
645 spin_lock(&GlobalMid_Lock);
646 if (!malformed)
647 mid->mid_state = MID_RESPONSE_RECEIVED;
648 else
649 mid->mid_state = MID_RESPONSE_MALFORMED;
650 list_del_init(&mid->qhead);
651 spin_unlock(&GlobalMid_Lock);
652 }
653
654 static void
655 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
656 char *buf, int malformed)
657 {
658 if (server->ops->check_trans2 &&
659 server->ops->check_trans2(mid, server, buf, malformed))
660 return;
661 mid->resp_buf = buf;
662 mid->large_buf = server->large_buf;
663 /* Was previous buf put in mpx struct for multi-rsp? */
664 if (!mid->multiRsp) {
665 /* smb buffer will be freed by user thread */
666 if (server->large_buf)
667 server->bigbuf = NULL;
668 else
669 server->smallbuf = NULL;
670 }
671 dequeue_mid(mid, malformed);
672 }
673
674 static void clean_demultiplex_info(struct TCP_Server_Info *server)
675 {
676 int length;
677
678 /* take it off the list, if it's not already */
679 spin_lock(&cifs_tcp_ses_lock);
680 list_del_init(&server->tcp_ses_list);
681 spin_unlock(&cifs_tcp_ses_lock);
682
683 spin_lock(&GlobalMid_Lock);
684 server->tcpStatus = CifsExiting;
685 spin_unlock(&GlobalMid_Lock);
686 wake_up_all(&server->response_q);
687
688 /* check if we have blocked requests that need to free */
689 spin_lock(&server->req_lock);
690 if (server->credits <= 0)
691 server->credits = 1;
692 spin_unlock(&server->req_lock);
693 /*
694 * Although there should not be any requests blocked on this queue it
695 * can not hurt to be paranoid and try to wake up requests that may
696 * haven been blocked when more than 50 at time were on the wire to the
697 * same server - they now will see the session is in exit state and get
698 * out of SendReceive.
699 */
700 wake_up_all(&server->request_q);
701 /* give those requests time to exit */
702 msleep(125);
703
704 if (server->ssocket) {
705 sock_release(server->ssocket);
706 server->ssocket = NULL;
707 }
708
709 if (!list_empty(&server->pending_mid_q)) {
710 struct list_head dispose_list;
711 struct mid_q_entry *mid_entry;
712 struct list_head *tmp, *tmp2;
713
714 INIT_LIST_HEAD(&dispose_list);
715 spin_lock(&GlobalMid_Lock);
716 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
717 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
718 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
719 mid_entry->mid_state = MID_SHUTDOWN;
720 list_move(&mid_entry->qhead, &dispose_list);
721 }
722 spin_unlock(&GlobalMid_Lock);
723
724 /* now walk dispose list and issue callbacks */
725 list_for_each_safe(tmp, tmp2, &dispose_list) {
726 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
727 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
728 list_del_init(&mid_entry->qhead);
729 mid_entry->callback(mid_entry);
730 }
731 /* 1/8th of sec is more than enough time for them to exit */
732 msleep(125);
733 }
734
735 if (!list_empty(&server->pending_mid_q)) {
736 /*
737 * mpx threads have not exited yet give them at least the smb
738 * send timeout time for long ops.
739 *
740 * Due to delays on oplock break requests, we need to wait at
741 * least 45 seconds before giving up on a request getting a
742 * response and going ahead and killing cifsd.
743 */
744 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
745 msleep(46000);
746 /*
747 * If threads still have not exited they are probably never
748 * coming home not much else we can do but free the memory.
749 */
750 }
751
752 kfree(server->hostname);
753 kfree(server);
754
755 length = atomic_dec_return(&tcpSesAllocCount);
756 if (length > 0)
757 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
758 }
759
760 static int
761 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
762 {
763 int length;
764 char *buf = server->smallbuf;
765 unsigned int pdu_length = get_rfc1002_length(buf);
766
767 /* make sure this will fit in a large buffer */
768 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
769 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
770 cifs_reconnect(server);
771 wake_up(&server->response_q);
772 return -ECONNABORTED;
773 }
774
775 /* switch to large buffer if too big for a small one */
776 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
777 server->large_buf = true;
778 memcpy(server->bigbuf, buf, server->total_read);
779 buf = server->bigbuf;
780 }
781
782 /* now read the rest */
783 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
784 pdu_length - HEADER_SIZE(server) + 1 + 4);
785 if (length < 0)
786 return length;
787 server->total_read += length;
788
789 dump_smb(buf, server->total_read);
790
791 return cifs_handle_standard(server, mid);
792 }
793
794 int
795 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
796 {
797 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
798 int length;
799
800 /*
801 * We know that we received enough to get to the MID as we
802 * checked the pdu_length earlier. Now check to see
803 * if the rest of the header is OK. We borrow the length
804 * var for the rest of the loop to avoid a new stack var.
805 *
806 * 48 bytes is enough to display the header and a little bit
807 * into the payload for debugging purposes.
808 */
809 length = server->ops->check_message(buf, server->total_read, server);
810 if (length != 0)
811 cifs_dump_mem("Bad SMB: ", buf,
812 min_t(unsigned int, server->total_read, 48));
813
814 if (server->ops->is_status_pending &&
815 server->ops->is_status_pending(buf, server, length))
816 return -1;
817
818 if (!mid)
819 return length;
820
821 handle_mid(mid, server, buf, length);
822 return 0;
823 }
824
825 static int
826 cifs_demultiplex_thread(void *p)
827 {
828 int length;
829 struct TCP_Server_Info *server = p;
830 unsigned int pdu_length;
831 char *buf = NULL;
832 struct task_struct *task_to_wake = NULL;
833 struct mid_q_entry *mid_entry;
834
835 current->flags |= PF_MEMALLOC;
836 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
837
838 length = atomic_inc_return(&tcpSesAllocCount);
839 if (length > 1)
840 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
841
842 set_freezable();
843 while (server->tcpStatus != CifsExiting) {
844 if (try_to_freeze())
845 continue;
846
847 if (!allocate_buffers(server))
848 continue;
849
850 server->large_buf = false;
851 buf = server->smallbuf;
852 pdu_length = 4; /* enough to get RFC1001 header */
853
854 length = cifs_read_from_socket(server, buf, pdu_length);
855 if (length < 0)
856 continue;
857 server->total_read = length;
858
859 /*
860 * The right amount was read from socket - 4 bytes,
861 * so we can now interpret the length field.
862 */
863 pdu_length = get_rfc1002_length(buf);
864
865 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
866 if (!is_smb_response(server, buf[0]))
867 continue;
868
869 /* make sure we have enough to get to the MID */
870 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
871 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
872 pdu_length);
873 cifs_reconnect(server);
874 wake_up(&server->response_q);
875 continue;
876 }
877
878 /* read down to the MID */
879 length = cifs_read_from_socket(server, buf + 4,
880 HEADER_SIZE(server) - 1 - 4);
881 if (length < 0)
882 continue;
883 server->total_read += length;
884
885 if (server->ops->is_transform_hdr &&
886 server->ops->receive_transform &&
887 server->ops->is_transform_hdr(buf)) {
888 length = server->ops->receive_transform(server,
889 &mid_entry);
890 } else {
891 mid_entry = server->ops->find_mid(server, buf);
892
893 if (!mid_entry || !mid_entry->receive)
894 length = standard_receive3(server, mid_entry);
895 else
896 length = mid_entry->receive(server, mid_entry);
897 }
898
899 if (length < 0)
900 continue;
901
902 if (server->large_buf)
903 buf = server->bigbuf;
904
905 server->lstrp = jiffies;
906 if (mid_entry != NULL) {
907 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
908 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
909 server->ops->handle_cancelled_mid)
910 server->ops->handle_cancelled_mid(
911 mid_entry->resp_buf,
912 server);
913
914 if (!mid_entry->multiRsp || mid_entry->multiEnd)
915 mid_entry->callback(mid_entry);
916 } else if (server->ops->is_oplock_break &&
917 server->ops->is_oplock_break(buf, server)) {
918 cifs_dbg(FYI, "Received oplock break\n");
919 } else {
920 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
921 atomic_read(&midCount));
922 cifs_dump_mem("Received Data is: ", buf,
923 HEADER_SIZE(server));
924 #ifdef CONFIG_CIFS_DEBUG2
925 if (server->ops->dump_detail)
926 server->ops->dump_detail(buf);
927 cifs_dump_mids(server);
928 #endif /* CIFS_DEBUG2 */
929
930 }
931 } /* end while !EXITING */
932
933 /* buffer usually freed in free_mid - need to free it here on exit */
934 cifs_buf_release(server->bigbuf);
935 if (server->smallbuf) /* no sense logging a debug message if NULL */
936 cifs_small_buf_release(server->smallbuf);
937
938 task_to_wake = xchg(&server->tsk, NULL);
939 clean_demultiplex_info(server);
940
941 /* if server->tsk was NULL then wait for a signal before exiting */
942 if (!task_to_wake) {
943 set_current_state(TASK_INTERRUPTIBLE);
944 while (!signal_pending(current)) {
945 schedule();
946 set_current_state(TASK_INTERRUPTIBLE);
947 }
948 set_current_state(TASK_RUNNING);
949 }
950
951 module_put_and_exit(0);
952 }
953
954 /* extract the host portion of the UNC string */
955 static char *
956 extract_hostname(const char *unc)
957 {
958 const char *src;
959 char *dst, *delim;
960 unsigned int len;
961
962 /* skip double chars at beginning of string */
963 /* BB: check validity of these bytes? */
964 src = unc + 2;
965
966 /* delimiter between hostname and sharename is always '\\' now */
967 delim = strchr(src, '\\');
968 if (!delim)
969 return ERR_PTR(-EINVAL);
970
971 len = delim - src;
972 dst = kmalloc((len + 1), GFP_KERNEL);
973 if (dst == NULL)
974 return ERR_PTR(-ENOMEM);
975
976 memcpy(dst, src, len);
977 dst[len] = '\0';
978
979 return dst;
980 }
981
982 static int get_option_ul(substring_t args[], unsigned long *option)
983 {
984 int rc;
985 char *string;
986
987 string = match_strdup(args);
988 if (string == NULL)
989 return -ENOMEM;
990 rc = kstrtoul(string, 0, option);
991 kfree(string);
992
993 return rc;
994 }
995
996 static int get_option_uid(substring_t args[], kuid_t *result)
997 {
998 unsigned long value;
999 kuid_t uid;
1000 int rc;
1001
1002 rc = get_option_ul(args, &value);
1003 if (rc)
1004 return rc;
1005
1006 uid = make_kuid(current_user_ns(), value);
1007 if (!uid_valid(uid))
1008 return -EINVAL;
1009
1010 *result = uid;
1011 return 0;
1012 }
1013
1014 static int get_option_gid(substring_t args[], kgid_t *result)
1015 {
1016 unsigned long value;
1017 kgid_t gid;
1018 int rc;
1019
1020 rc = get_option_ul(args, &value);
1021 if (rc)
1022 return rc;
1023
1024 gid = make_kgid(current_user_ns(), value);
1025 if (!gid_valid(gid))
1026 return -EINVAL;
1027
1028 *result = gid;
1029 return 0;
1030 }
1031
1032 static int cifs_parse_security_flavors(char *value,
1033 struct smb_vol *vol)
1034 {
1035
1036 substring_t args[MAX_OPT_ARGS];
1037
1038 /*
1039 * With mount options, the last one should win. Reset any existing
1040 * settings back to default.
1041 */
1042 vol->sectype = Unspecified;
1043 vol->sign = false;
1044
1045 switch (match_token(value, cifs_secflavor_tokens, args)) {
1046 case Opt_sec_krb5p:
1047 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1048 return 1;
1049 case Opt_sec_krb5i:
1050 vol->sign = true;
1051 /* Fallthrough */
1052 case Opt_sec_krb5:
1053 vol->sectype = Kerberos;
1054 break;
1055 case Opt_sec_ntlmsspi:
1056 vol->sign = true;
1057 /* Fallthrough */
1058 case Opt_sec_ntlmssp:
1059 vol->sectype = RawNTLMSSP;
1060 break;
1061 case Opt_sec_ntlmi:
1062 vol->sign = true;
1063 /* Fallthrough */
1064 case Opt_ntlm:
1065 vol->sectype = NTLM;
1066 break;
1067 case Opt_sec_ntlmv2i:
1068 vol->sign = true;
1069 /* Fallthrough */
1070 case Opt_sec_ntlmv2:
1071 vol->sectype = NTLMv2;
1072 break;
1073 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1074 case Opt_sec_lanman:
1075 vol->sectype = LANMAN;
1076 break;
1077 #endif
1078 case Opt_sec_none:
1079 vol->nullauth = 1;
1080 break;
1081 default:
1082 cifs_dbg(VFS, "bad security option: %s\n", value);
1083 return 1;
1084 }
1085
1086 return 0;
1087 }
1088
1089 static int
1090 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1091 {
1092 substring_t args[MAX_OPT_ARGS];
1093
1094 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1095 case Opt_cache_loose:
1096 vol->direct_io = false;
1097 vol->strict_io = false;
1098 break;
1099 case Opt_cache_strict:
1100 vol->direct_io = false;
1101 vol->strict_io = true;
1102 break;
1103 case Opt_cache_none:
1104 vol->direct_io = true;
1105 vol->strict_io = false;
1106 break;
1107 default:
1108 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1109 return 1;
1110 }
1111 return 0;
1112 }
1113
1114 static int
1115 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1116 {
1117 substring_t args[MAX_OPT_ARGS];
1118
1119 switch (match_token(value, cifs_smb_version_tokens, args)) {
1120 case Smb_1:
1121 vol->ops = &smb1_operations;
1122 vol->vals = &smb1_values;
1123 break;
1124 #ifdef CONFIG_CIFS_SMB2
1125 case Smb_20:
1126 vol->ops = &smb20_operations;
1127 vol->vals = &smb20_values;
1128 break;
1129 case Smb_21:
1130 vol->ops = &smb21_operations;
1131 vol->vals = &smb21_values;
1132 break;
1133 case Smb_30:
1134 vol->ops = &smb30_operations;
1135 vol->vals = &smb30_values;
1136 break;
1137 case Smb_302:
1138 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1139 vol->vals = &smb302_values;
1140 break;
1141 #ifdef CONFIG_CIFS_SMB311
1142 case Smb_311:
1143 vol->ops = &smb311_operations;
1144 vol->vals = &smb311_values;
1145 break;
1146 #endif /* SMB311 */
1147 #endif
1148 default:
1149 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1150 return 1;
1151 }
1152 return 0;
1153 }
1154
1155 /*
1156 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1157 * fields with the result. Returns 0 on success and an error otherwise.
1158 */
1159 static int
1160 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1161 {
1162 char *pos;
1163 const char *delims = "/\\";
1164 size_t len;
1165
1166 /* make sure we have a valid UNC double delimiter prefix */
1167 len = strspn(devname, delims);
1168 if (len != 2)
1169 return -EINVAL;
1170
1171 /* find delimiter between host and sharename */
1172 pos = strpbrk(devname + 2, delims);
1173 if (!pos)
1174 return -EINVAL;
1175
1176 /* skip past delimiter */
1177 ++pos;
1178
1179 /* now go until next delimiter or end of string */
1180 len = strcspn(pos, delims);
1181
1182 /* move "pos" up to delimiter or NULL */
1183 pos += len;
1184 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1185 if (!vol->UNC)
1186 return -ENOMEM;
1187
1188 convert_delimiter(vol->UNC, '\\');
1189
1190 /* skip any delimiter */
1191 if (*pos == '/' || *pos == '\\')
1192 pos++;
1193
1194 /* If pos is NULL then no prepath */
1195 if (!*pos)
1196 return 0;
1197
1198 vol->prepath = kstrdup(pos, GFP_KERNEL);
1199 if (!vol->prepath)
1200 return -ENOMEM;
1201
1202 return 0;
1203 }
1204
1205 static int
1206 cifs_parse_mount_options(const char *mountdata, const char *devname,
1207 struct smb_vol *vol)
1208 {
1209 char *data, *end;
1210 char *mountdata_copy = NULL, *options;
1211 unsigned int temp_len, i, j;
1212 char separator[2];
1213 short int override_uid = -1;
1214 short int override_gid = -1;
1215 bool uid_specified = false;
1216 bool gid_specified = false;
1217 bool sloppy = false;
1218 char *invalid = NULL;
1219 char *nodename = utsname()->nodename;
1220 char *string = NULL;
1221 char *tmp_end, *value;
1222 char delim;
1223 bool got_ip = false;
1224 unsigned short port = 0;
1225 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1226
1227 separator[0] = ',';
1228 separator[1] = 0;
1229 delim = separator[0];
1230
1231 /* ensure we always start with zeroed-out smb_vol */
1232 memset(vol, 0, sizeof(*vol));
1233
1234 /*
1235 * does not have to be perfect mapping since field is
1236 * informational, only used for servers that do not support
1237 * port 445 and it can be overridden at mount time
1238 */
1239 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1240 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1241 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1242
1243 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1244 /* null target name indicates to use *SMBSERVR default called name
1245 if we end up sending RFC1001 session initialize */
1246 vol->target_rfc1001_name[0] = 0;
1247 vol->cred_uid = current_uid();
1248 vol->linux_uid = current_uid();
1249 vol->linux_gid = current_gid();
1250
1251 /*
1252 * default to SFM style remapping of seven reserved characters
1253 * unless user overrides it or we negotiate CIFS POSIX where
1254 * it is unnecessary. Can not simultaneously use more than one mapping
1255 * since then readdir could list files that open could not open
1256 */
1257 vol->remap = true;
1258
1259 /* default to only allowing write access to owner of the mount */
1260 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1261
1262 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1263 /* default is always to request posix paths. */
1264 vol->posix_paths = 1;
1265 /* default to using server inode numbers where available */
1266 vol->server_ino = 1;
1267
1268 /* default is to use strict cifs caching semantics */
1269 vol->strict_io = true;
1270
1271 vol->actimeo = CIFS_DEF_ACTIMEO;
1272
1273 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1274 vol->ops = &smb1_operations;
1275 vol->vals = &smb1_values;
1276
1277 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1278
1279 if (!mountdata)
1280 goto cifs_parse_mount_err;
1281
1282 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1283 if (!mountdata_copy)
1284 goto cifs_parse_mount_err;
1285
1286 options = mountdata_copy;
1287 end = options + strlen(options);
1288
1289 if (strncmp(options, "sep=", 4) == 0) {
1290 if (options[4] != 0) {
1291 separator[0] = options[4];
1292 options += 5;
1293 } else {
1294 cifs_dbg(FYI, "Null separator not allowed\n");
1295 }
1296 }
1297 vol->backupuid_specified = false; /* no backup intent for a user */
1298 vol->backupgid_specified = false; /* no backup intent for a group */
1299
1300 switch (cifs_parse_devname(devname, vol)) {
1301 case 0:
1302 break;
1303 case -ENOMEM:
1304 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1305 goto cifs_parse_mount_err;
1306 case -EINVAL:
1307 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1308 goto cifs_parse_mount_err;
1309 default:
1310 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1311 goto cifs_parse_mount_err;
1312 }
1313
1314 while ((data = strsep(&options, separator)) != NULL) {
1315 substring_t args[MAX_OPT_ARGS];
1316 unsigned long option;
1317 int token;
1318
1319 if (!*data)
1320 continue;
1321
1322 token = match_token(data, cifs_mount_option_tokens, args);
1323
1324 switch (token) {
1325
1326 /* Ingnore the following */
1327 case Opt_ignore:
1328 break;
1329
1330 /* Boolean values */
1331 case Opt_user_xattr:
1332 vol->no_xattr = 0;
1333 break;
1334 case Opt_nouser_xattr:
1335 vol->no_xattr = 1;
1336 break;
1337 case Opt_forceuid:
1338 override_uid = 1;
1339 break;
1340 case Opt_noforceuid:
1341 override_uid = 0;
1342 break;
1343 case Opt_forcegid:
1344 override_gid = 1;
1345 break;
1346 case Opt_noforcegid:
1347 override_gid = 0;
1348 break;
1349 case Opt_noblocksend:
1350 vol->noblocksnd = 1;
1351 break;
1352 case Opt_noautotune:
1353 vol->noautotune = 1;
1354 break;
1355 case Opt_hard:
1356 vol->retry = 1;
1357 break;
1358 case Opt_soft:
1359 vol->retry = 0;
1360 break;
1361 case Opt_perm:
1362 vol->noperm = 0;
1363 break;
1364 case Opt_noperm:
1365 vol->noperm = 1;
1366 break;
1367 case Opt_mapchars:
1368 vol->sfu_remap = true;
1369 vol->remap = false; /* disable SFM mapping */
1370 break;
1371 case Opt_nomapchars:
1372 vol->sfu_remap = false;
1373 break;
1374 case Opt_mapposix:
1375 vol->remap = true;
1376 vol->sfu_remap = false; /* disable SFU mapping */
1377 break;
1378 case Opt_nomapposix:
1379 vol->remap = false;
1380 break;
1381 case Opt_sfu:
1382 vol->sfu_emul = 1;
1383 break;
1384 case Opt_nosfu:
1385 vol->sfu_emul = 0;
1386 break;
1387 case Opt_nodfs:
1388 vol->nodfs = 1;
1389 break;
1390 case Opt_posixpaths:
1391 vol->posix_paths = 1;
1392 break;
1393 case Opt_noposixpaths:
1394 vol->posix_paths = 0;
1395 break;
1396 case Opt_nounix:
1397 vol->no_linux_ext = 1;
1398 break;
1399 case Opt_nocase:
1400 vol->nocase = 1;
1401 break;
1402 case Opt_brl:
1403 vol->nobrl = 0;
1404 break;
1405 case Opt_nobrl:
1406 vol->nobrl = 1;
1407 /*
1408 * turn off mandatory locking in mode
1409 * if remote locking is turned off since the
1410 * local vfs will do advisory
1411 */
1412 if (vol->file_mode ==
1413 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1414 vol->file_mode = S_IALLUGO;
1415 break;
1416 case Opt_forcemandatorylock:
1417 vol->mand_lock = 1;
1418 break;
1419 case Opt_setuids:
1420 vol->setuids = 1;
1421 break;
1422 case Opt_nosetuids:
1423 vol->setuids = 0;
1424 break;
1425 case Opt_setuidfromacl:
1426 vol->setuidfromacl = 1;
1427 break;
1428 case Opt_dynperm:
1429 vol->dynperm = true;
1430 break;
1431 case Opt_nodynperm:
1432 vol->dynperm = false;
1433 break;
1434 case Opt_nohard:
1435 vol->retry = 0;
1436 break;
1437 case Opt_nosoft:
1438 vol->retry = 1;
1439 break;
1440 case Opt_nointr:
1441 vol->intr = 0;
1442 break;
1443 case Opt_intr:
1444 vol->intr = 1;
1445 break;
1446 case Opt_nostrictsync:
1447 vol->nostrictsync = 1;
1448 break;
1449 case Opt_strictsync:
1450 vol->nostrictsync = 0;
1451 break;
1452 case Opt_serverino:
1453 vol->server_ino = 1;
1454 break;
1455 case Opt_noserverino:
1456 vol->server_ino = 0;
1457 break;
1458 case Opt_rwpidforward:
1459 vol->rwpidforward = 1;
1460 break;
1461 case Opt_cifsacl:
1462 vol->cifs_acl = 1;
1463 break;
1464 case Opt_nocifsacl:
1465 vol->cifs_acl = 0;
1466 break;
1467 case Opt_acl:
1468 vol->no_psx_acl = 0;
1469 break;
1470 case Opt_noacl:
1471 vol->no_psx_acl = 1;
1472 break;
1473 case Opt_locallease:
1474 vol->local_lease = 1;
1475 break;
1476 case Opt_sign:
1477 vol->sign = true;
1478 break;
1479 case Opt_seal:
1480 /* we do not do the following in secFlags because seal
1481 * is a per tree connection (mount) not a per socket
1482 * or per-smb connection option in the protocol
1483 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1484 */
1485 vol->seal = 1;
1486 break;
1487 case Opt_noac:
1488 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1489 break;
1490 case Opt_fsc:
1491 #ifndef CONFIG_CIFS_FSCACHE
1492 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1493 goto cifs_parse_mount_err;
1494 #endif
1495 vol->fsc = true;
1496 break;
1497 case Opt_mfsymlinks:
1498 vol->mfsymlinks = true;
1499 break;
1500 case Opt_multiuser:
1501 vol->multiuser = true;
1502 break;
1503 case Opt_sloppy:
1504 sloppy = true;
1505 break;
1506 case Opt_nosharesock:
1507 vol->nosharesock = true;
1508 break;
1509 case Opt_nopersistent:
1510 vol->nopersistent = true;
1511 if (vol->persistent) {
1512 cifs_dbg(VFS,
1513 "persistenthandles mount options conflict\n");
1514 goto cifs_parse_mount_err;
1515 }
1516 break;
1517 case Opt_persistent:
1518 vol->persistent = true;
1519 if ((vol->nopersistent) || (vol->resilient)) {
1520 cifs_dbg(VFS,
1521 "persistenthandles mount options conflict\n");
1522 goto cifs_parse_mount_err;
1523 }
1524 break;
1525 case Opt_resilient:
1526 vol->resilient = true;
1527 if (vol->persistent) {
1528 cifs_dbg(VFS,
1529 "persistenthandles mount options conflict\n");
1530 goto cifs_parse_mount_err;
1531 }
1532 break;
1533 case Opt_noresilient:
1534 vol->resilient = false; /* already the default */
1535 break;
1536 case Opt_domainauto:
1537 vol->domainauto = true;
1538 break;
1539
1540 /* Numeric Values */
1541 case Opt_backupuid:
1542 if (get_option_uid(args, &vol->backupuid)) {
1543 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1544 __func__);
1545 goto cifs_parse_mount_err;
1546 }
1547 vol->backupuid_specified = true;
1548 break;
1549 case Opt_backupgid:
1550 if (get_option_gid(args, &vol->backupgid)) {
1551 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1552 __func__);
1553 goto cifs_parse_mount_err;
1554 }
1555 vol->backupgid_specified = true;
1556 break;
1557 case Opt_uid:
1558 if (get_option_uid(args, &vol->linux_uid)) {
1559 cifs_dbg(VFS, "%s: Invalid uid value\n",
1560 __func__);
1561 goto cifs_parse_mount_err;
1562 }
1563 uid_specified = true;
1564 break;
1565 case Opt_cruid:
1566 if (get_option_uid(args, &vol->cred_uid)) {
1567 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1568 __func__);
1569 goto cifs_parse_mount_err;
1570 }
1571 break;
1572 case Opt_gid:
1573 if (get_option_gid(args, &vol->linux_gid)) {
1574 cifs_dbg(VFS, "%s: Invalid gid value\n",
1575 __func__);
1576 goto cifs_parse_mount_err;
1577 }
1578 gid_specified = true;
1579 break;
1580 case Opt_file_mode:
1581 if (get_option_ul(args, &option)) {
1582 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1583 __func__);
1584 goto cifs_parse_mount_err;
1585 }
1586 vol->file_mode = option;
1587 break;
1588 case Opt_dirmode:
1589 if (get_option_ul(args, &option)) {
1590 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1591 __func__);
1592 goto cifs_parse_mount_err;
1593 }
1594 vol->dir_mode = option;
1595 break;
1596 case Opt_port:
1597 if (get_option_ul(args, &option) ||
1598 option > USHRT_MAX) {
1599 cifs_dbg(VFS, "%s: Invalid port value\n",
1600 __func__);
1601 goto cifs_parse_mount_err;
1602 }
1603 port = (unsigned short)option;
1604 break;
1605 case Opt_rsize:
1606 if (get_option_ul(args, &option)) {
1607 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1608 __func__);
1609 goto cifs_parse_mount_err;
1610 }
1611 vol->rsize = option;
1612 break;
1613 case Opt_wsize:
1614 if (get_option_ul(args, &option)) {
1615 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1616 __func__);
1617 goto cifs_parse_mount_err;
1618 }
1619 vol->wsize = option;
1620 break;
1621 case Opt_actimeo:
1622 if (get_option_ul(args, &option)) {
1623 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1624 __func__);
1625 goto cifs_parse_mount_err;
1626 }
1627 vol->actimeo = HZ * option;
1628 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1629 cifs_dbg(VFS, "attribute cache timeout too large\n");
1630 goto cifs_parse_mount_err;
1631 }
1632 break;
1633 case Opt_echo_interval:
1634 if (get_option_ul(args, &option)) {
1635 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1636 __func__);
1637 goto cifs_parse_mount_err;
1638 }
1639 vol->echo_interval = option;
1640 break;
1641 case Opt_snapshot:
1642 if (get_option_ul(args, &option)) {
1643 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1644 __func__);
1645 goto cifs_parse_mount_err;
1646 }
1647 vol->snapshot_time = option;
1648 break;
1649 case Opt_max_credits:
1650 if (get_option_ul(args, &option) || (option < 20) ||
1651 (option > 60000)) {
1652 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1653 __func__);
1654 goto cifs_parse_mount_err;
1655 }
1656 vol->max_credits = option;
1657 break;
1658
1659 /* String Arguments */
1660
1661 case Opt_blank_user:
1662 /* null user, ie. anonymous authentication */
1663 vol->nullauth = 1;
1664 vol->username = NULL;
1665 break;
1666 case Opt_user:
1667 string = match_strdup(args);
1668 if (string == NULL)
1669 goto out_nomem;
1670
1671 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1672 CIFS_MAX_USERNAME_LEN) {
1673 pr_warn("CIFS: username too long\n");
1674 goto cifs_parse_mount_err;
1675 }
1676
1677 kfree(vol->username);
1678 vol->username = kstrdup(string, GFP_KERNEL);
1679 if (!vol->username)
1680 goto cifs_parse_mount_err;
1681 break;
1682 case Opt_blank_pass:
1683 /* passwords have to be handled differently
1684 * to allow the character used for deliminator
1685 * to be passed within them
1686 */
1687
1688 /*
1689 * Check if this is a case where the password
1690 * starts with a delimiter
1691 */
1692 tmp_end = strchr(data, '=');
1693 tmp_end++;
1694 if (!(tmp_end < end && tmp_end[1] == delim)) {
1695 /* No it is not. Set the password to NULL */
1696 kfree(vol->password);
1697 vol->password = NULL;
1698 break;
1699 }
1700 /* Yes it is. Drop down to Opt_pass below.*/
1701 case Opt_pass:
1702 /* Obtain the value string */
1703 value = strchr(data, '=');
1704 value++;
1705
1706 /* Set tmp_end to end of the string */
1707 tmp_end = (char *) value + strlen(value);
1708
1709 /* Check if following character is the deliminator
1710 * If yes, we have encountered a double deliminator
1711 * reset the NULL character to the deliminator
1712 */
1713 if (tmp_end < end && tmp_end[1] == delim) {
1714 tmp_end[0] = delim;
1715
1716 /* Keep iterating until we get to a single
1717 * deliminator OR the end
1718 */
1719 while ((tmp_end = strchr(tmp_end, delim))
1720 != NULL && (tmp_end[1] == delim)) {
1721 tmp_end = (char *) &tmp_end[2];
1722 }
1723
1724 /* Reset var options to point to next element */
1725 if (tmp_end) {
1726 tmp_end[0] = '\0';
1727 options = (char *) &tmp_end[1];
1728 } else
1729 /* Reached the end of the mount option
1730 * string */
1731 options = end;
1732 }
1733
1734 kfree(vol->password);
1735 /* Now build new password string */
1736 temp_len = strlen(value);
1737 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1738 if (vol->password == NULL) {
1739 pr_warn("CIFS: no memory for password\n");
1740 goto cifs_parse_mount_err;
1741 }
1742
1743 for (i = 0, j = 0; i < temp_len; i++, j++) {
1744 vol->password[j] = value[i];
1745 if ((value[i] == delim) &&
1746 value[i+1] == delim)
1747 /* skip the second deliminator */
1748 i++;
1749 }
1750 vol->password[j] = '\0';
1751 break;
1752 case Opt_blank_ip:
1753 /* FIXME: should this be an error instead? */
1754 got_ip = false;
1755 break;
1756 case Opt_ip:
1757 string = match_strdup(args);
1758 if (string == NULL)
1759 goto out_nomem;
1760
1761 if (!cifs_convert_address(dstaddr, string,
1762 strlen(string))) {
1763 pr_err("CIFS: bad ip= option (%s).\n", string);
1764 goto cifs_parse_mount_err;
1765 }
1766 got_ip = true;
1767 break;
1768 case Opt_domain:
1769 string = match_strdup(args);
1770 if (string == NULL)
1771 goto out_nomem;
1772
1773 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1774 == CIFS_MAX_DOMAINNAME_LEN) {
1775 pr_warn("CIFS: domain name too long\n");
1776 goto cifs_parse_mount_err;
1777 }
1778
1779 kfree(vol->domainname);
1780 vol->domainname = kstrdup(string, GFP_KERNEL);
1781 if (!vol->domainname) {
1782 pr_warn("CIFS: no memory for domainname\n");
1783 goto cifs_parse_mount_err;
1784 }
1785 cifs_dbg(FYI, "Domain name set\n");
1786 break;
1787 case Opt_srcaddr:
1788 string = match_strdup(args);
1789 if (string == NULL)
1790 goto out_nomem;
1791
1792 if (!cifs_convert_address(
1793 (struct sockaddr *)&vol->srcaddr,
1794 string, strlen(string))) {
1795 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1796 string);
1797 goto cifs_parse_mount_err;
1798 }
1799 break;
1800 case Opt_iocharset:
1801 string = match_strdup(args);
1802 if (string == NULL)
1803 goto out_nomem;
1804
1805 if (strnlen(string, 1024) >= 65) {
1806 pr_warn("CIFS: iocharset name too long.\n");
1807 goto cifs_parse_mount_err;
1808 }
1809
1810 if (strncasecmp(string, "default", 7) != 0) {
1811 kfree(vol->iocharset);
1812 vol->iocharset = kstrdup(string,
1813 GFP_KERNEL);
1814 if (!vol->iocharset) {
1815 pr_warn("CIFS: no memory for charset\n");
1816 goto cifs_parse_mount_err;
1817 }
1818 }
1819 /* if iocharset not set then load_nls_default
1820 * is used by caller
1821 */
1822 cifs_dbg(FYI, "iocharset set to %s\n", string);
1823 break;
1824 case Opt_netbiosname:
1825 string = match_strdup(args);
1826 if (string == NULL)
1827 goto out_nomem;
1828
1829 memset(vol->source_rfc1001_name, 0x20,
1830 RFC1001_NAME_LEN);
1831 /*
1832 * FIXME: are there cases in which a comma can
1833 * be valid in workstation netbios name (and
1834 * need special handling)?
1835 */
1836 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1837 /* don't ucase netbiosname for user */
1838 if (string[i] == 0)
1839 break;
1840 vol->source_rfc1001_name[i] = string[i];
1841 }
1842 /* The string has 16th byte zero still from
1843 * set at top of the function
1844 */
1845 if (i == RFC1001_NAME_LEN && string[i] != 0)
1846 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1847 break;
1848 case Opt_servern:
1849 /* servernetbiosname specified override *SMBSERVER */
1850 string = match_strdup(args);
1851 if (string == NULL)
1852 goto out_nomem;
1853
1854 /* last byte, type, is 0x20 for servr type */
1855 memset(vol->target_rfc1001_name, 0x20,
1856 RFC1001_NAME_LEN_WITH_NULL);
1857
1858 /* BB are there cases in which a comma can be
1859 valid in this workstation netbios name
1860 (and need special handling)? */
1861
1862 /* user or mount helper must uppercase the
1863 netbios name */
1864 for (i = 0; i < 15; i++) {
1865 if (string[i] == 0)
1866 break;
1867 vol->target_rfc1001_name[i] = string[i];
1868 }
1869 /* The string has 16th byte zero still from
1870 set at top of the function */
1871 if (i == RFC1001_NAME_LEN && string[i] != 0)
1872 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1873 break;
1874 case Opt_ver:
1875 string = match_strdup(args);
1876 if (string == NULL)
1877 goto out_nomem;
1878
1879 if (strncasecmp(string, "1", 1) == 0) {
1880 /* This is the default */
1881 break;
1882 }
1883 /* For all other value, error */
1884 pr_warn("CIFS: Invalid version specified\n");
1885 goto cifs_parse_mount_err;
1886 case Opt_vers:
1887 string = match_strdup(args);
1888 if (string == NULL)
1889 goto out_nomem;
1890
1891 if (cifs_parse_smb_version(string, vol) != 0)
1892 goto cifs_parse_mount_err;
1893 break;
1894 case Opt_sec:
1895 string = match_strdup(args);
1896 if (string == NULL)
1897 goto out_nomem;
1898
1899 if (cifs_parse_security_flavors(string, vol) != 0)
1900 goto cifs_parse_mount_err;
1901 break;
1902 case Opt_cache:
1903 string = match_strdup(args);
1904 if (string == NULL)
1905 goto out_nomem;
1906
1907 if (cifs_parse_cache_flavor(string, vol) != 0)
1908 goto cifs_parse_mount_err;
1909 break;
1910 default:
1911 /*
1912 * An option we don't recognize. Save it off for later
1913 * if we haven't already found one
1914 */
1915 if (!invalid)
1916 invalid = data;
1917 break;
1918 }
1919 /* Free up any allocated string */
1920 kfree(string);
1921 string = NULL;
1922 }
1923
1924 if (!sloppy && invalid) {
1925 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1926 goto cifs_parse_mount_err;
1927 }
1928
1929 #ifndef CONFIG_KEYS
1930 /* Muliuser mounts require CONFIG_KEYS support */
1931 if (vol->multiuser) {
1932 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1933 goto cifs_parse_mount_err;
1934 }
1935 #endif
1936 if (!vol->UNC) {
1937 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1938 goto cifs_parse_mount_err;
1939 }
1940
1941 /* make sure UNC has a share name */
1942 if (!strchr(vol->UNC + 3, '\\')) {
1943 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1944 goto cifs_parse_mount_err;
1945 }
1946
1947 if (!got_ip) {
1948 /* No ip= option specified? Try to get it from UNC */
1949 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1950 strlen(&vol->UNC[2]))) {
1951 pr_err("Unable to determine destination address.\n");
1952 goto cifs_parse_mount_err;
1953 }
1954 }
1955
1956 /* set the port that we got earlier */
1957 cifs_set_port(dstaddr, port);
1958
1959 if (uid_specified)
1960 vol->override_uid = override_uid;
1961 else if (override_uid == 1)
1962 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1963
1964 if (gid_specified)
1965 vol->override_gid = override_gid;
1966 else if (override_gid == 1)
1967 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1968
1969 kfree(mountdata_copy);
1970 return 0;
1971
1972 out_nomem:
1973 pr_warn("Could not allocate temporary buffer\n");
1974 cifs_parse_mount_err:
1975 kfree(string);
1976 kfree(mountdata_copy);
1977 return 1;
1978 }
1979
1980 /** Returns true if srcaddr isn't specified and rhs isn't
1981 * specified, or if srcaddr is specified and
1982 * matches the IP address of the rhs argument.
1983 */
1984 static bool
1985 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1986 {
1987 switch (srcaddr->sa_family) {
1988 case AF_UNSPEC:
1989 return (rhs->sa_family == AF_UNSPEC);
1990 case AF_INET: {
1991 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1992 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1993 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1994 }
1995 case AF_INET6: {
1996 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1997 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1998 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1999 }
2000 default:
2001 WARN_ON(1);
2002 return false; /* don't expect to be here */
2003 }
2004 }
2005
2006 /*
2007 * If no port is specified in addr structure, we try to match with 445 port
2008 * and if it fails - with 139 ports. It should be called only if address
2009 * families of server and addr are equal.
2010 */
2011 static bool
2012 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2013 {
2014 __be16 port, *sport;
2015
2016 switch (addr->sa_family) {
2017 case AF_INET:
2018 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2019 port = ((struct sockaddr_in *) addr)->sin_port;
2020 break;
2021 case AF_INET6:
2022 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2023 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2024 break;
2025 default:
2026 WARN_ON(1);
2027 return false;
2028 }
2029
2030 if (!port) {
2031 port = htons(CIFS_PORT);
2032 if (port == *sport)
2033 return true;
2034
2035 port = htons(RFC1001_PORT);
2036 }
2037
2038 return port == *sport;
2039 }
2040
2041 static bool
2042 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2043 struct sockaddr *srcaddr)
2044 {
2045 switch (addr->sa_family) {
2046 case AF_INET: {
2047 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2048 struct sockaddr_in *srv_addr4 =
2049 (struct sockaddr_in *)&server->dstaddr;
2050
2051 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2052 return false;
2053 break;
2054 }
2055 case AF_INET6: {
2056 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2057 struct sockaddr_in6 *srv_addr6 =
2058 (struct sockaddr_in6 *)&server->dstaddr;
2059
2060 if (!ipv6_addr_equal(&addr6->sin6_addr,
2061 &srv_addr6->sin6_addr))
2062 return false;
2063 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2064 return false;
2065 break;
2066 }
2067 default:
2068 WARN_ON(1);
2069 return false; /* don't expect to be here */
2070 }
2071
2072 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2073 return false;
2074
2075 return true;
2076 }
2077
2078 static bool
2079 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2080 {
2081 /*
2082 * The select_sectype function should either return the vol->sectype
2083 * that was specified, or "Unspecified" if that sectype was not
2084 * compatible with the given NEGOTIATE request.
2085 */
2086 if (server->ops->select_sectype(server, vol->sectype)
2087 == Unspecified)
2088 return false;
2089
2090 /*
2091 * Now check if signing mode is acceptable. No need to check
2092 * global_secflags at this point since if MUST_SIGN is set then
2093 * the server->sign had better be too.
2094 */
2095 if (vol->sign && !server->sign)
2096 return false;
2097
2098 return true;
2099 }
2100
2101 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2102 {
2103 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2104
2105 if (vol->nosharesock)
2106 return 0;
2107
2108 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2109 return 0;
2110
2111 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2112 return 0;
2113
2114 if (!match_address(server, addr,
2115 (struct sockaddr *)&vol->srcaddr))
2116 return 0;
2117
2118 if (!match_port(server, addr))
2119 return 0;
2120
2121 if (!match_security(server, vol))
2122 return 0;
2123
2124 if (server->echo_interval != vol->echo_interval * HZ)
2125 return 0;
2126
2127 return 1;
2128 }
2129
2130 static struct TCP_Server_Info *
2131 cifs_find_tcp_session(struct smb_vol *vol)
2132 {
2133 struct TCP_Server_Info *server;
2134
2135 spin_lock(&cifs_tcp_ses_lock);
2136 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2137 if (!match_server(server, vol))
2138 continue;
2139
2140 ++server->srv_count;
2141 spin_unlock(&cifs_tcp_ses_lock);
2142 cifs_dbg(FYI, "Existing tcp session with server found\n");
2143 return server;
2144 }
2145 spin_unlock(&cifs_tcp_ses_lock);
2146 return NULL;
2147 }
2148
2149 void
2150 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2151 {
2152 struct task_struct *task;
2153
2154 spin_lock(&cifs_tcp_ses_lock);
2155 if (--server->srv_count > 0) {
2156 spin_unlock(&cifs_tcp_ses_lock);
2157 return;
2158 }
2159
2160 put_net(cifs_net_ns(server));
2161
2162 list_del_init(&server->tcp_ses_list);
2163 spin_unlock(&cifs_tcp_ses_lock);
2164
2165 cancel_delayed_work_sync(&server->echo);
2166
2167 #ifdef CONFIG_CIFS_SMB2
2168 if (from_reconnect)
2169 /*
2170 * Avoid deadlock here: reconnect work calls
2171 * cifs_put_tcp_session() at its end. Need to be sure
2172 * that reconnect work does nothing with server pointer after
2173 * that step.
2174 */
2175 cancel_delayed_work(&server->reconnect);
2176 else
2177 cancel_delayed_work_sync(&server->reconnect);
2178 #endif
2179
2180 spin_lock(&GlobalMid_Lock);
2181 server->tcpStatus = CifsExiting;
2182 spin_unlock(&GlobalMid_Lock);
2183
2184 cifs_crypto_secmech_release(server);
2185 cifs_fscache_release_client_cookie(server);
2186
2187 kfree(server->session_key.response);
2188 server->session_key.response = NULL;
2189 server->session_key.len = 0;
2190
2191 task = xchg(&server->tsk, NULL);
2192 if (task)
2193 force_sig(SIGKILL, task);
2194 }
2195
2196 static struct TCP_Server_Info *
2197 cifs_get_tcp_session(struct smb_vol *volume_info)
2198 {
2199 struct TCP_Server_Info *tcp_ses = NULL;
2200 int rc;
2201
2202 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2203
2204 /* see if we already have a matching tcp_ses */
2205 tcp_ses = cifs_find_tcp_session(volume_info);
2206 if (tcp_ses)
2207 return tcp_ses;
2208
2209 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2210 if (!tcp_ses) {
2211 rc = -ENOMEM;
2212 goto out_err;
2213 }
2214
2215 tcp_ses->ops = volume_info->ops;
2216 tcp_ses->vals = volume_info->vals;
2217 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2218 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2219 if (IS_ERR(tcp_ses->hostname)) {
2220 rc = PTR_ERR(tcp_ses->hostname);
2221 goto out_err_crypto_release;
2222 }
2223
2224 tcp_ses->noblocksnd = volume_info->noblocksnd;
2225 tcp_ses->noautotune = volume_info->noautotune;
2226 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2227 tcp_ses->in_flight = 0;
2228 tcp_ses->credits = 1;
2229 init_waitqueue_head(&tcp_ses->response_q);
2230 init_waitqueue_head(&tcp_ses->request_q);
2231 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2232 mutex_init(&tcp_ses->srv_mutex);
2233 memcpy(tcp_ses->workstation_RFC1001_name,
2234 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2235 memcpy(tcp_ses->server_RFC1001_name,
2236 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2237 tcp_ses->session_estab = false;
2238 tcp_ses->sequence_number = 0;
2239 tcp_ses->lstrp = jiffies;
2240 spin_lock_init(&tcp_ses->req_lock);
2241 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2242 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2243 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2244 #ifdef CONFIG_CIFS_SMB2
2245 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2246 mutex_init(&tcp_ses->reconnect_mutex);
2247 #endif
2248 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2249 sizeof(tcp_ses->srcaddr));
2250 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2251 sizeof(tcp_ses->dstaddr));
2252 #ifdef CONFIG_CIFS_SMB2
2253 generate_random_uuid(tcp_ses->client_guid);
2254 #endif
2255 /*
2256 * at this point we are the only ones with the pointer
2257 * to the struct since the kernel thread not created yet
2258 * no need to spinlock this init of tcpStatus or srv_count
2259 */
2260 tcp_ses->tcpStatus = CifsNew;
2261 ++tcp_ses->srv_count;
2262
2263 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2264 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2265 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2266 else
2267 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2268
2269 rc = ip_connect(tcp_ses);
2270 if (rc < 0) {
2271 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2272 goto out_err_crypto_release;
2273 }
2274
2275 /*
2276 * since we're in a cifs function already, we know that
2277 * this will succeed. No need for try_module_get().
2278 */
2279 __module_get(THIS_MODULE);
2280 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2281 tcp_ses, "cifsd");
2282 if (IS_ERR(tcp_ses->tsk)) {
2283 rc = PTR_ERR(tcp_ses->tsk);
2284 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2285 module_put(THIS_MODULE);
2286 goto out_err_crypto_release;
2287 }
2288 tcp_ses->tcpStatus = CifsNeedNegotiate;
2289
2290 /* thread spawned, put it on the list */
2291 spin_lock(&cifs_tcp_ses_lock);
2292 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2293 spin_unlock(&cifs_tcp_ses_lock);
2294
2295 cifs_fscache_get_client_cookie(tcp_ses);
2296
2297 /* queue echo request delayed work */
2298 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2299
2300 return tcp_ses;
2301
2302 out_err_crypto_release:
2303 cifs_crypto_secmech_release(tcp_ses);
2304
2305 put_net(cifs_net_ns(tcp_ses));
2306
2307 out_err:
2308 if (tcp_ses) {
2309 if (!IS_ERR(tcp_ses->hostname))
2310 kfree(tcp_ses->hostname);
2311 if (tcp_ses->ssocket)
2312 sock_release(tcp_ses->ssocket);
2313 kfree(tcp_ses);
2314 }
2315 return ERR_PTR(rc);
2316 }
2317
2318 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2319 {
2320 if (vol->sectype != Unspecified &&
2321 vol->sectype != ses->sectype)
2322 return 0;
2323
2324 switch (ses->sectype) {
2325 case Kerberos:
2326 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2327 return 0;
2328 break;
2329 default:
2330 /* NULL username means anonymous session */
2331 if (ses->user_name == NULL) {
2332 if (!vol->nullauth)
2333 return 0;
2334 break;
2335 }
2336
2337 /* anything else takes username/password */
2338 if (strncmp(ses->user_name,
2339 vol->username ? vol->username : "",
2340 CIFS_MAX_USERNAME_LEN))
2341 return 0;
2342 if ((vol->username && strlen(vol->username) != 0) &&
2343 ses->password != NULL &&
2344 strncmp(ses->password,
2345 vol->password ? vol->password : "",
2346 CIFS_MAX_PASSWORD_LEN))
2347 return 0;
2348 }
2349 return 1;
2350 }
2351
2352 static struct cifs_ses *
2353 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2354 {
2355 struct cifs_ses *ses;
2356
2357 spin_lock(&cifs_tcp_ses_lock);
2358 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2359 if (ses->status == CifsExiting)
2360 continue;
2361 if (!match_session(ses, vol))
2362 continue;
2363 ++ses->ses_count;
2364 spin_unlock(&cifs_tcp_ses_lock);
2365 return ses;
2366 }
2367 spin_unlock(&cifs_tcp_ses_lock);
2368 return NULL;
2369 }
2370
2371 static void
2372 cifs_put_smb_ses(struct cifs_ses *ses)
2373 {
2374 unsigned int rc, xid;
2375 struct TCP_Server_Info *server = ses->server;
2376
2377 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2378
2379 spin_lock(&cifs_tcp_ses_lock);
2380 if (ses->status == CifsExiting) {
2381 spin_unlock(&cifs_tcp_ses_lock);
2382 return;
2383 }
2384 if (--ses->ses_count > 0) {
2385 spin_unlock(&cifs_tcp_ses_lock);
2386 return;
2387 }
2388 if (ses->status == CifsGood)
2389 ses->status = CifsExiting;
2390 spin_unlock(&cifs_tcp_ses_lock);
2391
2392 if (ses->status == CifsExiting && server->ops->logoff) {
2393 xid = get_xid();
2394 rc = server->ops->logoff(xid, ses);
2395 if (rc)
2396 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2397 __func__, rc);
2398 _free_xid(xid);
2399 }
2400
2401 spin_lock(&cifs_tcp_ses_lock);
2402 list_del_init(&ses->smb_ses_list);
2403 spin_unlock(&cifs_tcp_ses_lock);
2404
2405 sesInfoFree(ses);
2406 cifs_put_tcp_session(server, 0);
2407 }
2408
2409 #ifdef CONFIG_KEYS
2410
2411 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2412 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2413
2414 /* Populate username and pw fields from keyring if possible */
2415 static int
2416 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2417 {
2418 int rc = 0;
2419 const char *delim, *payload;
2420 char *desc;
2421 ssize_t len;
2422 struct key *key;
2423 struct TCP_Server_Info *server = ses->server;
2424 struct sockaddr_in *sa;
2425 struct sockaddr_in6 *sa6;
2426 const struct user_key_payload *upayload;
2427
2428 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2429 if (!desc)
2430 return -ENOMEM;
2431
2432 /* try to find an address key first */
2433 switch (server->dstaddr.ss_family) {
2434 case AF_INET:
2435 sa = (struct sockaddr_in *)&server->dstaddr;
2436 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2437 break;
2438 case AF_INET6:
2439 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2440 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2441 break;
2442 default:
2443 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2444 server->dstaddr.ss_family);
2445 rc = -EINVAL;
2446 goto out_err;
2447 }
2448
2449 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2450 key = request_key(&key_type_logon, desc, "");
2451 if (IS_ERR(key)) {
2452 if (!ses->domainName) {
2453 cifs_dbg(FYI, "domainName is NULL\n");
2454 rc = PTR_ERR(key);
2455 goto out_err;
2456 }
2457
2458 /* didn't work, try to find a domain key */
2459 sprintf(desc, "cifs:d:%s", ses->domainName);
2460 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2461 key = request_key(&key_type_logon, desc, "");
2462 if (IS_ERR(key)) {
2463 rc = PTR_ERR(key);
2464 goto out_err;
2465 }
2466 }
2467
2468 down_read(&key->sem);
2469 upayload = user_key_payload_locked(key);
2470 if (IS_ERR_OR_NULL(upayload)) {
2471 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2472 goto out_key_put;
2473 }
2474
2475 /* find first : in payload */
2476 payload = upayload->data;
2477 delim = strnchr(payload, upayload->datalen, ':');
2478 cifs_dbg(FYI, "payload=%s\n", payload);
2479 if (!delim) {
2480 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2481 upayload->datalen);
2482 rc = -EINVAL;
2483 goto out_key_put;
2484 }
2485
2486 len = delim - payload;
2487 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2488 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2489 len);
2490 rc = -EINVAL;
2491 goto out_key_put;
2492 }
2493
2494 vol->username = kstrndup(payload, len, GFP_KERNEL);
2495 if (!vol->username) {
2496 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2497 len);
2498 rc = -ENOMEM;
2499 goto out_key_put;
2500 }
2501 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2502
2503 len = key->datalen - (len + 1);
2504 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2505 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2506 rc = -EINVAL;
2507 kfree(vol->username);
2508 vol->username = NULL;
2509 goto out_key_put;
2510 }
2511
2512 ++delim;
2513 vol->password = kstrndup(delim, len, GFP_KERNEL);
2514 if (!vol->password) {
2515 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2516 len);
2517 rc = -ENOMEM;
2518 kfree(vol->username);
2519 vol->username = NULL;
2520 goto out_key_put;
2521 }
2522
2523 out_key_put:
2524 up_read(&key->sem);
2525 key_put(key);
2526 out_err:
2527 kfree(desc);
2528 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2529 return rc;
2530 }
2531 #else /* ! CONFIG_KEYS */
2532 static inline int
2533 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2534 struct cifs_ses *ses __attribute__((unused)))
2535 {
2536 return -ENOSYS;
2537 }
2538 #endif /* CONFIG_KEYS */
2539
2540 static struct cifs_ses *
2541 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2542 {
2543 int rc = -ENOMEM;
2544 unsigned int xid;
2545 struct cifs_ses *ses;
2546 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2547 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2548
2549 xid = get_xid();
2550
2551 ses = cifs_find_smb_ses(server, volume_info);
2552 if (ses) {
2553 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2554 ses->status);
2555
2556 mutex_lock(&ses->session_mutex);
2557 rc = cifs_negotiate_protocol(xid, ses);
2558 if (rc) {
2559 mutex_unlock(&ses->session_mutex);
2560 /* problem -- put our ses reference */
2561 cifs_put_smb_ses(ses);
2562 free_xid(xid);
2563 return ERR_PTR(rc);
2564 }
2565 if (ses->need_reconnect) {
2566 cifs_dbg(FYI, "Session needs reconnect\n");
2567 rc = cifs_setup_session(xid, ses,
2568 volume_info->local_nls);
2569 if (rc) {
2570 mutex_unlock(&ses->session_mutex);
2571 /* problem -- put our reference */
2572 cifs_put_smb_ses(ses);
2573 free_xid(xid);
2574 return ERR_PTR(rc);
2575 }
2576 }
2577 mutex_unlock(&ses->session_mutex);
2578
2579 /* existing SMB ses has a server reference already */
2580 cifs_put_tcp_session(server, 0);
2581 free_xid(xid);
2582 return ses;
2583 }
2584
2585 cifs_dbg(FYI, "Existing smb sess not found\n");
2586 ses = sesInfoAlloc();
2587 if (ses == NULL)
2588 goto get_ses_fail;
2589
2590 /* new SMB session uses our server ref */
2591 ses->server = server;
2592 if (server->dstaddr.ss_family == AF_INET6)
2593 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2594 else
2595 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2596
2597 if (volume_info->username) {
2598 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2599 if (!ses->user_name)
2600 goto get_ses_fail;
2601 }
2602
2603 /* volume_info->password freed at unmount */
2604 if (volume_info->password) {
2605 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2606 if (!ses->password)
2607 goto get_ses_fail;
2608 }
2609 if (volume_info->domainname) {
2610 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2611 if (!ses->domainName)
2612 goto get_ses_fail;
2613 }
2614 if (volume_info->domainauto)
2615 ses->domainAuto = volume_info->domainauto;
2616 ses->cred_uid = volume_info->cred_uid;
2617 ses->linux_uid = volume_info->linux_uid;
2618
2619 ses->sectype = volume_info->sectype;
2620 ses->sign = volume_info->sign;
2621
2622 mutex_lock(&ses->session_mutex);
2623 rc = cifs_negotiate_protocol(xid, ses);
2624 if (!rc)
2625 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2626 mutex_unlock(&ses->session_mutex);
2627 if (rc)
2628 goto get_ses_fail;
2629
2630 /* success, put it on the list */
2631 spin_lock(&cifs_tcp_ses_lock);
2632 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2633 spin_unlock(&cifs_tcp_ses_lock);
2634
2635 free_xid(xid);
2636 return ses;
2637
2638 get_ses_fail:
2639 sesInfoFree(ses);
2640 free_xid(xid);
2641 return ERR_PTR(rc);
2642 }
2643
2644 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2645 {
2646 if (tcon->tidStatus == CifsExiting)
2647 return 0;
2648 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2649 return 0;
2650 if (tcon->seal != volume_info->seal)
2651 return 0;
2652 #ifdef CONFIG_CIFS_SMB2
2653 if (tcon->snapshot_time != volume_info->snapshot_time)
2654 return 0;
2655 #endif /* CONFIG_CIFS_SMB2 */
2656 return 1;
2657 }
2658
2659 static struct cifs_tcon *
2660 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2661 {
2662 struct list_head *tmp;
2663 struct cifs_tcon *tcon;
2664
2665 spin_lock(&cifs_tcp_ses_lock);
2666 list_for_each(tmp, &ses->tcon_list) {
2667 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2668 if (!match_tcon(tcon, volume_info))
2669 continue;
2670 ++tcon->tc_count;
2671 spin_unlock(&cifs_tcp_ses_lock);
2672 return tcon;
2673 }
2674 spin_unlock(&cifs_tcp_ses_lock);
2675 return NULL;
2676 }
2677
2678 void
2679 cifs_put_tcon(struct cifs_tcon *tcon)
2680 {
2681 unsigned int xid;
2682 struct cifs_ses *ses = tcon->ses;
2683
2684 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2685 spin_lock(&cifs_tcp_ses_lock);
2686 if (--tcon->tc_count > 0) {
2687 spin_unlock(&cifs_tcp_ses_lock);
2688 return;
2689 }
2690
2691 list_del_init(&tcon->tcon_list);
2692 spin_unlock(&cifs_tcp_ses_lock);
2693
2694 xid = get_xid();
2695 if (ses->server->ops->tree_disconnect)
2696 ses->server->ops->tree_disconnect(xid, tcon);
2697 _free_xid(xid);
2698
2699 cifs_fscache_release_super_cookie(tcon);
2700 tconInfoFree(tcon);
2701 cifs_put_smb_ses(ses);
2702 }
2703
2704 static struct cifs_tcon *
2705 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2706 {
2707 int rc, xid;
2708 struct cifs_tcon *tcon;
2709
2710 tcon = cifs_find_tcon(ses, volume_info);
2711 if (tcon) {
2712 cifs_dbg(FYI, "Found match on UNC path\n");
2713 /* existing tcon already has a reference */
2714 cifs_put_smb_ses(ses);
2715 return tcon;
2716 }
2717
2718 if (!ses->server->ops->tree_connect) {
2719 rc = -ENOSYS;
2720 goto out_fail;
2721 }
2722
2723 tcon = tconInfoAlloc();
2724 if (tcon == NULL) {
2725 rc = -ENOMEM;
2726 goto out_fail;
2727 }
2728
2729 if (volume_info->snapshot_time) {
2730 #ifdef CONFIG_CIFS_SMB2
2731 if (ses->server->vals->protocol_id == 0) {
2732 cifs_dbg(VFS,
2733 "Use SMB2 or later for snapshot mount option\n");
2734 rc = -EOPNOTSUPP;
2735 goto out_fail;
2736 } else
2737 tcon->snapshot_time = volume_info->snapshot_time;
2738 #else
2739 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2740 rc = -EOPNOTSUPP;
2741 goto out_fail;
2742 #endif /* CONFIG_CIFS_SMB2 */
2743 }
2744
2745 tcon->ses = ses;
2746 if (volume_info->password) {
2747 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2748 if (!tcon->password) {
2749 rc = -ENOMEM;
2750 goto out_fail;
2751 }
2752 }
2753
2754 /*
2755 * BB Do we need to wrap session_mutex around this TCon call and Unix
2756 * SetFS as we do on SessSetup and reconnect?
2757 */
2758 xid = get_xid();
2759 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2760 volume_info->local_nls);
2761 free_xid(xid);
2762 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2763 if (rc)
2764 goto out_fail;
2765
2766 if (volume_info->nodfs) {
2767 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2768 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2769 }
2770 tcon->use_persistent = false;
2771 /* check if SMB2 or later, CIFS does not support persistent handles */
2772 if (volume_info->persistent) {
2773 if (ses->server->vals->protocol_id == 0) {
2774 cifs_dbg(VFS,
2775 "SMB3 or later required for persistent handles\n");
2776 rc = -EOPNOTSUPP;
2777 goto out_fail;
2778 #ifdef CONFIG_CIFS_SMB2
2779 } else if (ses->server->capabilities &
2780 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2781 tcon->use_persistent = true;
2782 else /* persistent handles requested but not supported */ {
2783 cifs_dbg(VFS,
2784 "Persistent handles not supported on share\n");
2785 rc = -EOPNOTSUPP;
2786 goto out_fail;
2787 #endif /* CONFIG_CIFS_SMB2 */
2788 }
2789 #ifdef CONFIG_CIFS_SMB2
2790 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2791 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2792 && (volume_info->nopersistent == false)) {
2793 cifs_dbg(FYI, "enabling persistent handles\n");
2794 tcon->use_persistent = true;
2795 #endif /* CONFIG_CIFS_SMB2 */
2796 } else if (volume_info->resilient) {
2797 if (ses->server->vals->protocol_id == 0) {
2798 cifs_dbg(VFS,
2799 "SMB2.1 or later required for resilient handles\n");
2800 rc = -EOPNOTSUPP;
2801 goto out_fail;
2802 }
2803 tcon->use_resilient = true;
2804 }
2805
2806 if (volume_info->seal) {
2807 if (ses->server->vals->protocol_id == 0) {
2808 cifs_dbg(VFS,
2809 "SMB3 or later required for encryption\n");
2810 rc = -EOPNOTSUPP;
2811 goto out_fail;
2812 #ifdef CONFIG_CIFS_SMB2
2813 } else if (tcon->ses->server->capabilities &
2814 SMB2_GLOBAL_CAP_ENCRYPTION)
2815 tcon->seal = true;
2816 else {
2817 cifs_dbg(VFS, "Encryption is not supported on share\n");
2818 rc = -EOPNOTSUPP;
2819 goto out_fail;
2820 #endif /* CONFIG_CIFS_SMB2 */
2821 }
2822 }
2823
2824 /*
2825 * We can have only one retry value for a connection to a share so for
2826 * resources mounted more than once to the same server share the last
2827 * value passed in for the retry flag is used.
2828 */
2829 tcon->retry = volume_info->retry;
2830 tcon->nocase = volume_info->nocase;
2831 tcon->local_lease = volume_info->local_lease;
2832 INIT_LIST_HEAD(&tcon->pending_opens);
2833
2834 spin_lock(&cifs_tcp_ses_lock);
2835 list_add(&tcon->tcon_list, &ses->tcon_list);
2836 spin_unlock(&cifs_tcp_ses_lock);
2837
2838 cifs_fscache_get_super_cookie(tcon);
2839
2840 return tcon;
2841
2842 out_fail:
2843 tconInfoFree(tcon);
2844 return ERR_PTR(rc);
2845 }
2846
2847 void
2848 cifs_put_tlink(struct tcon_link *tlink)
2849 {
2850 if (!tlink || IS_ERR(tlink))
2851 return;
2852
2853 if (!atomic_dec_and_test(&tlink->tl_count) ||
2854 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2855 tlink->tl_time = jiffies;
2856 return;
2857 }
2858
2859 if (!IS_ERR(tlink_tcon(tlink)))
2860 cifs_put_tcon(tlink_tcon(tlink));
2861 kfree(tlink);
2862 return;
2863 }
2864
2865 static inline struct tcon_link *
2866 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2867 {
2868 return cifs_sb->master_tlink;
2869 }
2870
2871 static int
2872 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2873 {
2874 struct cifs_sb_info *old = CIFS_SB(sb);
2875 struct cifs_sb_info *new = mnt_data->cifs_sb;
2876
2877 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2878 return 0;
2879
2880 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2881 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2882 return 0;
2883
2884 /*
2885 * We want to share sb only if we don't specify an r/wsize or
2886 * specified r/wsize is greater than or equal to existing one.
2887 */
2888 if (new->wsize && new->wsize < old->wsize)
2889 return 0;
2890
2891 if (new->rsize && new->rsize < old->rsize)
2892 return 0;
2893
2894 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2895 return 0;
2896
2897 if (old->mnt_file_mode != new->mnt_file_mode ||
2898 old->mnt_dir_mode != new->mnt_dir_mode)
2899 return 0;
2900
2901 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2902 return 0;
2903
2904 if (old->actimeo != new->actimeo)
2905 return 0;
2906
2907 return 1;
2908 }
2909
2910 static int
2911 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2912 {
2913 struct cifs_sb_info *old = CIFS_SB(sb);
2914 struct cifs_sb_info *new = mnt_data->cifs_sb;
2915
2916 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2917 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2918 return 0;
2919 /* The prepath should be null terminated strings */
2920 if (strcmp(new->prepath, old->prepath))
2921 return 0;
2922
2923 return 1;
2924 }
2925 return 0;
2926 }
2927
2928 int
2929 cifs_match_super(struct super_block *sb, void *data)
2930 {
2931 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2932 struct smb_vol *volume_info;
2933 struct cifs_sb_info *cifs_sb;
2934 struct TCP_Server_Info *tcp_srv;
2935 struct cifs_ses *ses;
2936 struct cifs_tcon *tcon;
2937 struct tcon_link *tlink;
2938 int rc = 0;
2939
2940 spin_lock(&cifs_tcp_ses_lock);
2941 cifs_sb = CIFS_SB(sb);
2942 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2943 if (IS_ERR(tlink)) {
2944 spin_unlock(&cifs_tcp_ses_lock);
2945 return rc;
2946 }
2947 tcon = tlink_tcon(tlink);
2948 ses = tcon->ses;
2949 tcp_srv = ses->server;
2950
2951 volume_info = mnt_data->vol;
2952
2953 if (!match_server(tcp_srv, volume_info) ||
2954 !match_session(ses, volume_info) ||
2955 !match_tcon(tcon, volume_info) ||
2956 !match_prepath(sb, mnt_data)) {
2957 rc = 0;
2958 goto out;
2959 }
2960
2961 rc = compare_mount_options(sb, mnt_data);
2962 out:
2963 spin_unlock(&cifs_tcp_ses_lock);
2964 cifs_put_tlink(tlink);
2965 return rc;
2966 }
2967
2968 int
2969 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2970 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2971 struct dfs_info3_param **referrals, int remap)
2972 {
2973 char *temp_unc;
2974 int rc = 0;
2975
2976 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2977 return -ENOSYS;
2978
2979 *num_referrals = 0;
2980 *referrals = NULL;
2981
2982 if (ses->ipc_tid == 0) {
2983 temp_unc = kmalloc(2 /* for slashes */ +
2984 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2985 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2986 if (temp_unc == NULL)
2987 return -ENOMEM;
2988 temp_unc[0] = '\\';
2989 temp_unc[1] = '\\';
2990 strcpy(temp_unc + 2, ses->serverName);
2991 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2992 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2993 nls_codepage);
2994 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2995 kfree(temp_unc);
2996 }
2997 if (rc == 0)
2998 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2999 referrals, num_referrals,
3000 nls_codepage, remap);
3001 /*
3002 * BB - map targetUNCs to dfs_info3 structures, here or in
3003 * ses->server->ops->get_dfs_refer.
3004 */
3005
3006 return rc;
3007 }
3008
3009 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3010 static struct lock_class_key cifs_key[2];
3011 static struct lock_class_key cifs_slock_key[2];
3012
3013 static inline void
3014 cifs_reclassify_socket4(struct socket *sock)
3015 {
3016 struct sock *sk = sock->sk;
3017 BUG_ON(!sock_allow_reclassification(sk));
3018 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3019 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3020 }
3021
3022 static inline void
3023 cifs_reclassify_socket6(struct socket *sock)
3024 {
3025 struct sock *sk = sock->sk;
3026 BUG_ON(!sock_allow_reclassification(sk));
3027 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3028 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3029 }
3030 #else
3031 static inline void
3032 cifs_reclassify_socket4(struct socket *sock)
3033 {
3034 }
3035
3036 static inline void
3037 cifs_reclassify_socket6(struct socket *sock)
3038 {
3039 }
3040 #endif
3041
3042 /* See RFC1001 section 14 on representation of Netbios names */
3043 static void rfc1002mangle(char *target, char *source, unsigned int length)
3044 {
3045 unsigned int i, j;
3046
3047 for (i = 0, j = 0; i < (length); i++) {
3048 /* mask a nibble at a time and encode */
3049 target[j] = 'A' + (0x0F & (source[i] >> 4));
3050 target[j+1] = 'A' + (0x0F & source[i]);
3051 j += 2;
3052 }
3053
3054 }
3055
3056 static int
3057 bind_socket(struct TCP_Server_Info *server)
3058 {
3059 int rc = 0;
3060 if (server->srcaddr.ss_family != AF_UNSPEC) {
3061 /* Bind to the specified local IP address */
3062 struct socket *socket = server->ssocket;
3063 rc = socket->ops->bind(socket,
3064 (struct sockaddr *) &server->srcaddr,
3065 sizeof(server->srcaddr));
3066 if (rc < 0) {
3067 struct sockaddr_in *saddr4;
3068 struct sockaddr_in6 *saddr6;
3069 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3070 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3071 if (saddr6->sin6_family == AF_INET6)
3072 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3073 &saddr6->sin6_addr, rc);
3074 else
3075 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3076 &saddr4->sin_addr.s_addr, rc);
3077 }
3078 }
3079 return rc;
3080 }
3081
3082 static int
3083 ip_rfc1001_connect(struct TCP_Server_Info *server)
3084 {
3085 int rc = 0;
3086 /*
3087 * some servers require RFC1001 sessinit before sending
3088 * negprot - BB check reconnection in case where second
3089 * sessinit is sent but no second negprot
3090 */
3091 struct rfc1002_session_packet *ses_init_buf;
3092 struct smb_hdr *smb_buf;
3093 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3094 GFP_KERNEL);
3095 if (ses_init_buf) {
3096 ses_init_buf->trailer.session_req.called_len = 32;
3097
3098 if (server->server_RFC1001_name[0] != 0)
3099 rfc1002mangle(ses_init_buf->trailer.
3100 session_req.called_name,
3101 server->server_RFC1001_name,
3102 RFC1001_NAME_LEN_WITH_NULL);
3103 else
3104 rfc1002mangle(ses_init_buf->trailer.
3105 session_req.called_name,
3106 DEFAULT_CIFS_CALLED_NAME,
3107 RFC1001_NAME_LEN_WITH_NULL);
3108
3109 ses_init_buf->trailer.session_req.calling_len = 32;
3110
3111 /*
3112 * calling name ends in null (byte 16) from old smb
3113 * convention.
3114 */
3115 if (server->workstation_RFC1001_name[0] != 0)
3116 rfc1002mangle(ses_init_buf->trailer.
3117 session_req.calling_name,
3118 server->workstation_RFC1001_name,
3119 RFC1001_NAME_LEN_WITH_NULL);
3120 else
3121 rfc1002mangle(ses_init_buf->trailer.
3122 session_req.calling_name,
3123 "LINUX_CIFS_CLNT",
3124 RFC1001_NAME_LEN_WITH_NULL);
3125
3126 ses_init_buf->trailer.session_req.scope1 = 0;
3127 ses_init_buf->trailer.session_req.scope2 = 0;
3128 smb_buf = (struct smb_hdr *)ses_init_buf;
3129
3130 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3131 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3132 rc = smb_send(server, smb_buf, 0x44);
3133 kfree(ses_init_buf);
3134 /*
3135 * RFC1001 layer in at least one server
3136 * requires very short break before negprot
3137 * presumably because not expecting negprot
3138 * to follow so fast. This is a simple
3139 * solution that works without
3140 * complicating the code and causes no
3141 * significant slowing down on mount
3142 * for everyone else
3143 */
3144 usleep_range(1000, 2000);
3145 }
3146 /*
3147 * else the negprot may still work without this
3148 * even though malloc failed
3149 */
3150
3151 return rc;
3152 }
3153
3154 static int
3155 generic_ip_connect(struct TCP_Server_Info *server)
3156 {
3157 int rc = 0;
3158 __be16 sport;
3159 int slen, sfamily;
3160 struct socket *socket = server->ssocket;
3161 struct sockaddr *saddr;
3162
3163 saddr = (struct sockaddr *) &server->dstaddr;
3164
3165 if (server->dstaddr.ss_family == AF_INET6) {
3166 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3167 slen = sizeof(struct sockaddr_in6);
3168 sfamily = AF_INET6;
3169 } else {
3170 sport = ((struct sockaddr_in *) saddr)->sin_port;
3171 slen = sizeof(struct sockaddr_in);
3172 sfamily = AF_INET;
3173 }
3174
3175 if (socket == NULL) {
3176 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3177 IPPROTO_TCP, &socket, 1);
3178 if (rc < 0) {
3179 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3180 server->ssocket = NULL;
3181 return rc;
3182 }
3183
3184 /* BB other socket options to set KEEPALIVE, NODELAY? */
3185 cifs_dbg(FYI, "Socket created\n");
3186 server->ssocket = socket;
3187 socket->sk->sk_allocation = GFP_NOFS;
3188 if (sfamily == AF_INET6)
3189 cifs_reclassify_socket6(socket);
3190 else
3191 cifs_reclassify_socket4(socket);
3192 }
3193
3194 rc = bind_socket(server);
3195 if (rc < 0)
3196 return rc;
3197
3198 /*
3199 * Eventually check for other socket options to change from
3200 * the default. sock_setsockopt not used because it expects
3201 * user space buffer
3202 */
3203 socket->sk->sk_rcvtimeo = 7 * HZ;
3204 socket->sk->sk_sndtimeo = 5 * HZ;
3205
3206 /* make the bufsizes depend on wsize/rsize and max requests */
3207 if (server->noautotune) {
3208 if (socket->sk->sk_sndbuf < (200 * 1024))
3209 socket->sk->sk_sndbuf = 200 * 1024;
3210 if (socket->sk->sk_rcvbuf < (140 * 1024))
3211 socket->sk->sk_rcvbuf = 140 * 1024;
3212 }
3213
3214 if (server->tcp_nodelay) {
3215 int val = 1;
3216 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3217 (char *)&val, sizeof(val));
3218 if (rc)
3219 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3220 rc);
3221 }
3222
3223 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3224 socket->sk->sk_sndbuf,
3225 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3226
3227 rc = socket->ops->connect(socket, saddr, slen, 0);
3228 if (rc < 0) {
3229 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3230 sock_release(socket);
3231 server->ssocket = NULL;
3232 return rc;
3233 }
3234
3235 if (sport == htons(RFC1001_PORT))
3236 rc = ip_rfc1001_connect(server);
3237
3238 return rc;
3239 }
3240
3241 static int
3242 ip_connect(struct TCP_Server_Info *server)
3243 {
3244 __be16 *sport;
3245 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3246 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3247
3248 if (server->dstaddr.ss_family == AF_INET6)
3249 sport = &addr6->sin6_port;
3250 else
3251 sport = &addr->sin_port;
3252
3253 if (*sport == 0) {
3254 int rc;
3255
3256 /* try with 445 port at first */
3257 *sport = htons(CIFS_PORT);
3258
3259 rc = generic_ip_connect(server);
3260 if (rc >= 0)
3261 return rc;
3262
3263 /* if it failed, try with 139 port */
3264 *sport = htons(RFC1001_PORT);
3265 }
3266
3267 return generic_ip_connect(server);
3268 }
3269
3270 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3271 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3272 {
3273 /* if we are reconnecting then should we check to see if
3274 * any requested capabilities changed locally e.g. via
3275 * remount but we can not do much about it here
3276 * if they have (even if we could detect it by the following)
3277 * Perhaps we could add a backpointer to array of sb from tcon
3278 * or if we change to make all sb to same share the same
3279 * sb as NFS - then we only have one backpointer to sb.
3280 * What if we wanted to mount the server share twice once with
3281 * and once without posixacls or posix paths? */
3282 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3283
3284 if (vol_info && vol_info->no_linux_ext) {
3285 tcon->fsUnixInfo.Capability = 0;
3286 tcon->unix_ext = 0; /* Unix Extensions disabled */
3287 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3288 return;
3289 } else if (vol_info)
3290 tcon->unix_ext = 1; /* Unix Extensions supported */
3291
3292 if (tcon->unix_ext == 0) {
3293 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3294 return;
3295 }
3296
3297 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3298 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3299 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3300 /* check for reconnect case in which we do not
3301 want to change the mount behavior if we can avoid it */
3302 if (vol_info == NULL) {
3303 /* turn off POSIX ACL and PATHNAMES if not set
3304 originally at mount time */
3305 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3306 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3307 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3308 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3309 cifs_dbg(VFS, "POSIXPATH support change\n");
3310 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3311 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3312 cifs_dbg(VFS, "possible reconnect error\n");
3313 cifs_dbg(VFS, "server disabled POSIX path support\n");
3314 }
3315 }
3316
3317 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3318 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3319
3320 cap &= CIFS_UNIX_CAP_MASK;
3321 if (vol_info && vol_info->no_psx_acl)
3322 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3323 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3324 cifs_dbg(FYI, "negotiated posix acl support\n");
3325 if (cifs_sb)
3326 cifs_sb->mnt_cifs_flags |=
3327 CIFS_MOUNT_POSIXACL;
3328 }
3329
3330 if (vol_info && vol_info->posix_paths == 0)
3331 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3332 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3333 cifs_dbg(FYI, "negotiate posix pathnames\n");
3334 if (cifs_sb)
3335 cifs_sb->mnt_cifs_flags |=
3336 CIFS_MOUNT_POSIX_PATHS;
3337 }
3338
3339 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3340 #ifdef CONFIG_CIFS_DEBUG2
3341 if (cap & CIFS_UNIX_FCNTL_CAP)
3342 cifs_dbg(FYI, "FCNTL cap\n");
3343 if (cap & CIFS_UNIX_EXTATTR_CAP)
3344 cifs_dbg(FYI, "EXTATTR cap\n");
3345 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3346 cifs_dbg(FYI, "POSIX path cap\n");
3347 if (cap & CIFS_UNIX_XATTR_CAP)
3348 cifs_dbg(FYI, "XATTR cap\n");
3349 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3350 cifs_dbg(FYI, "POSIX ACL cap\n");
3351 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3352 cifs_dbg(FYI, "very large read cap\n");
3353 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3354 cifs_dbg(FYI, "very large write cap\n");
3355 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3356 cifs_dbg(FYI, "transport encryption cap\n");
3357 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3358 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3359 #endif /* CIFS_DEBUG2 */
3360 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3361 if (vol_info == NULL) {
3362 cifs_dbg(FYI, "resetting capabilities failed\n");
3363 } else
3364 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");
3365
3366 }
3367 }
3368 }
3369
3370 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3371 struct cifs_sb_info *cifs_sb)
3372 {
3373 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3374
3375 spin_lock_init(&cifs_sb->tlink_tree_lock);
3376 cifs_sb->tlink_tree = RB_ROOT;
3377
3378 /*
3379 * Temporarily set r/wsize for matching superblock. If we end up using
3380 * new sb then client will later negotiate it downward if needed.
3381 */
3382 cifs_sb->rsize = pvolume_info->rsize;
3383 cifs_sb->wsize = pvolume_info->wsize;
3384
3385 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3386 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3387 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3388 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3389 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3390 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3391
3392 cifs_sb->actimeo = pvolume_info->actimeo;
3393 cifs_sb->local_nls = pvolume_info->local_nls;
3394
3395 if (pvolume_info->noperm)
3396 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3397 if (pvolume_info->setuids)
3398 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3399 if (pvolume_info->setuidfromacl)
3400 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3401 if (pvolume_info->server_ino)
3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3403 if (pvolume_info->remap)
3404 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3405 if (pvolume_info->sfu_remap)
3406 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3407 if (pvolume_info->no_xattr)
3408 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3409 if (pvolume_info->sfu_emul)
3410 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3411 if (pvolume_info->nobrl)
3412 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3413 if (pvolume_info->nostrictsync)
3414 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3415 if (pvolume_info->mand_lock)
3416 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3417 if (pvolume_info->rwpidforward)
3418 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3419 if (pvolume_info->cifs_acl)
3420 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3421 if (pvolume_info->backupuid_specified) {
3422 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3423 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3424 }
3425 if (pvolume_info->backupgid_specified) {
3426 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3427 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3428 }
3429 if (pvolume_info->override_uid)
3430 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3431 if (pvolume_info->override_gid)
3432 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3433 if (pvolume_info->dynperm)
3434 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3435 if (pvolume_info->fsc)
3436 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3437 if (pvolume_info->multiuser)
3438 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3439 CIFS_MOUNT_NO_PERM);
3440 if (pvolume_info->strict_io)
3441 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3442 if (pvolume_info->direct_io) {
3443 cifs_dbg(FYI, "mounting share using direct i/o\n");
3444 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3445 }
3446 if (pvolume_info->mfsymlinks) {
3447 if (pvolume_info->sfu_emul) {
3448 /*
3449 * Our SFU ("Services for Unix" emulation does not allow
3450 * creating symlinks but does allow reading existing SFU
3451 * symlinks (it does allow both creating and reading SFU
3452 * style mknod and FIFOs though). When "mfsymlinks" and
3453 * "sfu" are both enabled at the same time, it allows
3454 * reading both types of symlinks, but will only create
3455 * them with mfsymlinks format. This allows better
3456 * Apple compatibility (probably better for Samba too)
3457 * while still recognizing old Windows style symlinks.
3458 */
3459 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3460 }
3461 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3462 }
3463
3464 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3465 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3466
3467 if (pvolume_info->prepath) {
3468 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3469 if (cifs_sb->prepath == NULL)
3470 return -ENOMEM;
3471 }
3472
3473 return 0;
3474 }
3475
3476 static void
3477 cleanup_volume_info_contents(struct smb_vol *volume_info)
3478 {
3479 kfree(volume_info->username);
3480 kzfree(volume_info->password);
3481 kfree(volume_info->UNC);
3482 kfree(volume_info->domainname);
3483 kfree(volume_info->iocharset);
3484 kfree(volume_info->prepath);
3485 }
3486
3487 void
3488 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3489 {
3490 if (!volume_info)
3491 return;
3492 cleanup_volume_info_contents(volume_info);
3493 kfree(volume_info);
3494 }
3495
3496
3497 #ifdef CONFIG_CIFS_DFS_UPCALL
3498 /*
3499 * cifs_build_path_to_root returns full path to root when we do not have an
3500 * exiting connection (tcon)
3501 */
3502 static char *
3503 build_unc_path_to_root(const struct smb_vol *vol,
3504 const struct cifs_sb_info *cifs_sb)
3505 {
3506 char *full_path, *pos;
3507 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3508 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3509
3510 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3511 if (full_path == NULL)
3512 return ERR_PTR(-ENOMEM);
3513
3514 strncpy(full_path, vol->UNC, unc_len);
3515 pos = full_path + unc_len;
3516
3517 if (pplen) {
3518 *pos = CIFS_DIR_SEP(cifs_sb);
3519 strncpy(pos + 1, vol->prepath, pplen);
3520 pos += pplen;
3521 }
3522
3523 *pos = '\0'; /* add trailing null */
3524 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3525 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3526 return full_path;
3527 }
3528
3529 /*
3530 * Perform a dfs referral query for a share and (optionally) prefix
3531 *
3532 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3533 * to a string containing updated options for the submount. Otherwise it
3534 * will be left untouched.
3535 *
3536 * Returns the rc from get_dfs_path to the caller, which can be used to
3537 * determine whether there were referrals.
3538 */
3539 static int
3540 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3541 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3542 int check_prefix)
3543 {
3544 int rc;
3545 unsigned int num_referrals = 0;
3546 struct dfs_info3_param *referrals = NULL;
3547 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3548
3549 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3550 if (IS_ERR(full_path))
3551 return PTR_ERR(full_path);
3552
3553 /* For DFS paths, skip the first '\' of the UNC */
3554 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3555
3556 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3557 &num_referrals, &referrals, cifs_remap(cifs_sb));
3558
3559 if (!rc && num_referrals > 0) {
3560 char *fake_devname = NULL;
3561
3562 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3563 full_path + 1, referrals,
3564 &fake_devname);
3565
3566 free_dfs_info_array(referrals, num_referrals);
3567
3568 if (IS_ERR(mdata)) {
3569 rc = PTR_ERR(mdata);
3570 mdata = NULL;
3571 } else {
3572 cleanup_volume_info_contents(volume_info);
3573 rc = cifs_setup_volume_info(volume_info, mdata,
3574 fake_devname);
3575 }
3576 kfree(fake_devname);
3577 kfree(cifs_sb->mountdata);
3578 cifs_sb->mountdata = mdata;
3579 }
3580 kfree(full_path);
3581 return rc;
3582 }
3583 #endif
3584
3585 static int
3586 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3587 const char *devname)
3588 {
3589 int rc = 0;
3590
3591 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3592 return -EINVAL;
3593
3594 if (volume_info->nullauth) {
3595 cifs_dbg(FYI, "Anonymous login\n");
3596 kfree(volume_info->username);
3597 volume_info->username = NULL;
3598 } else if (volume_info->username) {
3599 /* BB fixme parse for domain name here */
3600 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3601 } else {
3602 cifs_dbg(VFS, "No username specified\n");
3603 /* In userspace mount helper we can get user name from alternate
3604 locations such as env variables and files on disk */
3605 return -EINVAL;
3606 }
3607
3608 /* this is needed for ASCII cp to Unicode converts */
3609 if (volume_info->iocharset == NULL) {
3610 /* load_nls_default cannot return null */
3611 volume_info->local_nls = load_nls_default();
3612 } else {
3613 volume_info->local_nls = load_nls(volume_info->iocharset);
3614 if (volume_info->local_nls == NULL) {
3615 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3616 volume_info->iocharset);
3617 return -ELIBACC;
3618 }
3619 }
3620
3621 return rc;
3622 }
3623
3624 struct smb_vol *
3625 cifs_get_volume_info(char *mount_data, const char *devname)
3626 {
3627 int rc;
3628 struct smb_vol *volume_info;
3629
3630 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3631 if (!volume_info)
3632 return ERR_PTR(-ENOMEM);
3633
3634 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3635 if (rc) {
3636 cifs_cleanup_volume_info(volume_info);
3637 volume_info = ERR_PTR(rc);
3638 }
3639
3640 return volume_info;
3641 }
3642
3643 static int
3644 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3645 unsigned int xid,
3646 struct cifs_tcon *tcon,
3647 struct cifs_sb_info *cifs_sb,
3648 char *full_path)
3649 {
3650 int rc;
3651 char *s;
3652 char sep, tmp;
3653
3654 sep = CIFS_DIR_SEP(cifs_sb);
3655 s = full_path;
3656
3657 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3658 while (rc == 0) {
3659 /* skip separators */
3660 while (*s == sep)
3661 s++;
3662 if (!*s)
3663 break;
3664 /* next separator */
3665 while (*s && *s != sep)
3666 s++;
3667
3668 /*
3669 * temporarily null-terminate the path at the end of
3670 * the current component
3671 */
3672 tmp = *s;
3673 *s = 0;
3674 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3675 full_path);
3676 *s = tmp;
3677 }
3678 return rc;
3679 }
3680
3681 int
3682 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3683 {
3684 int rc;
3685 unsigned int xid;
3686 struct cifs_ses *ses;
3687 struct cifs_tcon *tcon;
3688 struct TCP_Server_Info *server;
3689 char *full_path;
3690 struct tcon_link *tlink;
3691 #ifdef CONFIG_CIFS_DFS_UPCALL
3692 int referral_walks_count = 0;
3693 #endif
3694
3695 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3696 if (rc)
3697 return rc;
3698
3699 #ifdef CONFIG_CIFS_DFS_UPCALL
3700 try_mount_again:
3701 /* cleanup activities if we're chasing a referral */
3702 if (referral_walks_count) {
3703 if (tcon)
3704 cifs_put_tcon(tcon);
3705 else if (ses)
3706 cifs_put_smb_ses(ses);
3707
3708 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3709
3710 free_xid(xid);
3711 }
3712 #endif
3713 rc = 0;
3714 tcon = NULL;
3715 ses = NULL;
3716 server = NULL;
3717 full_path = NULL;
3718 tlink = NULL;
3719
3720 xid = get_xid();
3721
3722 /* get a reference to a tcp session */
3723 server = cifs_get_tcp_session(volume_info);
3724 if (IS_ERR(server)) {
3725 rc = PTR_ERR(server);
3726 bdi_destroy(&cifs_sb->bdi);
3727 goto out;
3728 }
3729 if ((volume_info->max_credits < 20) ||
3730 (volume_info->max_credits > 60000))
3731 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3732 else
3733 server->max_credits = volume_info->max_credits;
3734 /* get a reference to a SMB session */
3735 ses = cifs_get_smb_ses(server, volume_info);
3736 if (IS_ERR(ses)) {
3737 rc = PTR_ERR(ses);
3738 ses = NULL;
3739 goto mount_fail_check;
3740 }
3741
3742 #ifdef CONFIG_CIFS_SMB2
3743 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3744 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3745 cifs_dbg(VFS, "persistent handles not supported by server\n");
3746 rc = -EOPNOTSUPP;
3747 goto mount_fail_check;
3748 }
3749 #endif /* CONFIG_CIFS_SMB2*/
3750
3751 /* search for existing tcon to this server share */
3752 tcon = cifs_get_tcon(ses, volume_info);
3753 if (IS_ERR(tcon)) {
3754 rc = PTR_ERR(tcon);
3755 tcon = NULL;
3756 if (rc == -EACCES)
3757 goto mount_fail_check;
3758
3759 goto remote_path_check;
3760 }
3761
3762 /* tell server which Unix caps we support */
3763 if (cap_unix(tcon->ses)) {
3764 /* reset of caps checks mount to see if unix extensions
3765 disabled for just this mount */
3766 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3767 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3768 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3769 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3770 rc = -EACCES;
3771 goto mount_fail_check;
3772 }
3773 } else
3774 tcon->unix_ext = 0; /* server does not support them */
3775
3776 /* do not care if a following call succeed - informational */
3777 if (!tcon->ipc && server->ops->qfs_tcon)
3778 server->ops->qfs_tcon(xid, tcon);
3779
3780 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3781 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3782
3783 /* tune readahead according to rsize */
3784 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
3785
3786 remote_path_check:
3787 #ifdef CONFIG_CIFS_DFS_UPCALL
3788 /*
3789 * Perform an unconditional check for whether there are DFS
3790 * referrals for this path without prefix, to provide support
3791 * for DFS referrals from w2k8 servers which don't seem to respond
3792 * with PATH_NOT_COVERED to requests that include the prefix.
3793 * Chase the referral if found, otherwise continue normally.
3794 */
3795 if (referral_walks_count == 0) {
3796 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3797 false);
3798 if (!refrc) {
3799 referral_walks_count++;
3800 goto try_mount_again;
3801 }
3802 }
3803 #endif
3804
3805 /* check if a whole path is not remote */
3806 if (!rc && tcon) {
3807 if (!server->ops->is_path_accessible) {
3808 rc = -ENOSYS;
3809 goto mount_fail_check;
3810 }
3811 /*
3812 * cifs_build_path_to_root works only when we have a valid tcon
3813 */
3814 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3815 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3816 if (full_path == NULL) {
3817 rc = -ENOMEM;
3818 goto mount_fail_check;
3819 }
3820 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3821 full_path);
3822 if (rc != 0 && rc != -EREMOTE) {
3823 kfree(full_path);
3824 goto mount_fail_check;
3825 }
3826
3827 if (rc != -EREMOTE) {
3828 rc = cifs_are_all_path_components_accessible(server,
3829 xid, tcon, cifs_sb,
3830 full_path);
3831 if (rc != 0) {
3832 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3833 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3834 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3835 rc = 0;
3836 }
3837 }
3838 kfree(full_path);
3839 }
3840
3841 /* get referral if needed */
3842 if (rc == -EREMOTE) {
3843 #ifdef CONFIG_CIFS_DFS_UPCALL
3844 if (referral_walks_count > MAX_NESTED_LINKS) {
3845 /*
3846 * BB: when we implement proper loop detection,
3847 * we will remove this check. But now we need it
3848 * to prevent an indefinite loop if 'DFS tree' is
3849 * misconfigured (i.e. has loops).
3850 */
3851 rc = -ELOOP;
3852 goto mount_fail_check;
3853 }
3854
3855 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3856
3857 if (!rc) {
3858 referral_walks_count++;
3859 goto try_mount_again;
3860 }
3861 goto mount_fail_check;
3862 #else /* No DFS support, return error on mount */
3863 rc = -EOPNOTSUPP;
3864 #endif
3865 }
3866
3867 if (rc)
3868 goto mount_fail_check;
3869
3870 /* now, hang the tcon off of the superblock */
3871 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3872 if (tlink == NULL) {
3873 rc = -ENOMEM;
3874 goto mount_fail_check;
3875 }
3876
3877 tlink->tl_uid = ses->linux_uid;
3878 tlink->tl_tcon = tcon;
3879 tlink->tl_time = jiffies;
3880 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3881 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3882
3883 cifs_sb->master_tlink = tlink;
3884 spin_lock(&cifs_sb->tlink_tree_lock);
3885 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3886 spin_unlock(&cifs_sb->tlink_tree_lock);
3887
3888 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3889 TLINK_IDLE_EXPIRE);
3890
3891 mount_fail_check:
3892 /* on error free sesinfo and tcon struct if needed */
3893 if (rc) {
3894 /* If find_unc succeeded then rc == 0 so we can not end */
3895 /* up accidentally freeing someone elses tcon struct */
3896 if (tcon)
3897 cifs_put_tcon(tcon);
3898 else if (ses)
3899 cifs_put_smb_ses(ses);
3900 else
3901 cifs_put_tcp_session(server, 0);
3902 bdi_destroy(&cifs_sb->bdi);
3903 }
3904
3905 out:
3906 free_xid(xid);
3907 return rc;
3908 }
3909
3910 /*
3911 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3912 * pointer may be NULL.
3913 */
3914 int
3915 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3916 const char *tree, struct cifs_tcon *tcon,
3917 const struct nls_table *nls_codepage)
3918 {
3919 struct smb_hdr *smb_buffer;
3920 struct smb_hdr *smb_buffer_response;
3921 TCONX_REQ *pSMB;
3922 TCONX_RSP *pSMBr;
3923 unsigned char *bcc_ptr;
3924 int rc = 0;
3925 int length;
3926 __u16 bytes_left, count;
3927
3928 if (ses == NULL)
3929 return -EIO;
3930
3931 smb_buffer = cifs_buf_get();
3932 if (smb_buffer == NULL)
3933 return -ENOMEM;
3934
3935 smb_buffer_response = smb_buffer;
3936
3937 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3938 NULL /*no tid */ , 4 /*wct */ );
3939
3940 smb_buffer->Mid = get_next_mid(ses->server);
3941 smb_buffer->Uid = ses->Suid;
3942 pSMB = (TCONX_REQ *) smb_buffer;
3943 pSMBr = (TCONX_RSP *) smb_buffer_response;
3944
3945 pSMB->AndXCommand = 0xFF;
3946 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3947 bcc_ptr = &pSMB->Password[0];
3948 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3949 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3950 *bcc_ptr = 0; /* password is null byte */
3951 bcc_ptr++; /* skip password */
3952 /* already aligned so no need to do it below */
3953 } else {
3954 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3955 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3956 specified as required (when that support is added to
3957 the vfs in the future) as only NTLM or the much
3958 weaker LANMAN (which we do not send by default) is accepted
3959 by Samba (not sure whether other servers allow
3960 NTLMv2 password here) */
3961 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3962 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3963 (ses->sectype == LANMAN))
3964 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3965 ses->server->sec_mode &
3966 SECMODE_PW_ENCRYPT ? true : false,
3967 bcc_ptr);
3968 else
3969 #endif /* CIFS_WEAK_PW_HASH */
3970 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3971 bcc_ptr, nls_codepage);
3972 if (rc) {
3973 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3974 __func__, rc);
3975 cifs_buf_release(smb_buffer);
3976 return rc;
3977 }
3978
3979 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3980 if (ses->capabilities & CAP_UNICODE) {
3981 /* must align unicode strings */
3982 *bcc_ptr = 0; /* null byte password */
3983 bcc_ptr++;
3984 }
3985 }
3986
3987 if (ses->server->sign)
3988 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3989
3990 if (ses->capabilities & CAP_STATUS32) {
3991 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3992 }
3993 if (ses->capabilities & CAP_DFS) {
3994 smb_buffer->Flags2 |= SMBFLG2_DFS;
3995 }
3996 if (ses->capabilities & CAP_UNICODE) {
3997 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3998 length =
3999 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4000 6 /* max utf8 char length in bytes */ *
4001 (/* server len*/ + 256 /* share len */), nls_codepage);
4002 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4003 bcc_ptr += 2; /* skip trailing null */
4004 } else { /* ASCII */
4005 strcpy(bcc_ptr, tree);
4006 bcc_ptr += strlen(tree) + 1;
4007 }
4008 strcpy(bcc_ptr, "?????");
4009 bcc_ptr += strlen("?????");
4010 bcc_ptr += 1;
4011 count = bcc_ptr - &pSMB->Password[0];
4012 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4013 pSMB->hdr.smb_buf_length) + count);
4014 pSMB->ByteCount = cpu_to_le16(count);
4015
4016 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4017 0);
4018
4019 /* above now done in SendReceive */
4020 if ((rc == 0) && (tcon != NULL)) {
4021 bool is_unicode;
4022
4023 tcon->tidStatus = CifsGood;
4024 tcon->need_reconnect = false;
4025 tcon->tid = smb_buffer_response->Tid;
4026 bcc_ptr = pByteArea(smb_buffer_response);
4027 bytes_left = get_bcc(smb_buffer_response);
4028 length = strnlen(bcc_ptr, bytes_left - 2);
4029 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4030 is_unicode = true;
4031 else
4032 is_unicode = false;
4033
4034
4035 /* skip service field (NB: this field is always ASCII) */
4036 if (length == 3) {
4037 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4038 (bcc_ptr[2] == 'C')) {
4039 cifs_dbg(FYI, "IPC connection\n");
4040 tcon->ipc = 1;
4041 }
4042 } else if (length == 2) {
4043 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4044 /* the most common case */
4045 cifs_dbg(FYI, "disk share connection\n");
4046 }
4047 }
4048 bcc_ptr += length + 1;
4049 bytes_left -= (length + 1);
4050 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4051
4052 /* mostly informational -- no need to fail on error here */
4053 kfree(tcon->nativeFileSystem);
4054 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4055 bytes_left, is_unicode,
4056 nls_codepage);
4057
4058 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4059
4060 if ((smb_buffer_response->WordCount == 3) ||
4061 (smb_buffer_response->WordCount == 7))
4062 /* field is in same location */
4063 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4064 else
4065 tcon->Flags = 0;
4066 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4067 } else if ((rc == 0) && tcon == NULL) {
4068 /* all we need to save for IPC$ connection */
4069 ses->ipc_tid = smb_buffer_response->Tid;
4070 }
4071
4072 cifs_buf_release(smb_buffer);
4073 return rc;
4074 }
4075
4076 static void delayed_free(struct rcu_head *p)
4077 {
4078 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4079 unload_nls(sbi->local_nls);
4080 kfree(sbi);
4081 }
4082
4083 void
4084 cifs_umount(struct cifs_sb_info *cifs_sb)
4085 {
4086 struct rb_root *root = &cifs_sb->tlink_tree;
4087 struct rb_node *node;
4088 struct tcon_link *tlink;
4089
4090 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4091
4092 spin_lock(&cifs_sb->tlink_tree_lock);
4093 while ((node = rb_first(root))) {
4094 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4095 cifs_get_tlink(tlink);
4096 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4097 rb_erase(node, root);
4098
4099 spin_unlock(&cifs_sb->tlink_tree_lock);
4100 cifs_put_tlink(tlink);
4101 spin_lock(&cifs_sb->tlink_tree_lock);
4102 }
4103 spin_unlock(&cifs_sb->tlink_tree_lock);
4104
4105 bdi_destroy(&cifs_sb->bdi);
4106 kfree(cifs_sb->mountdata);
4107 kfree(cifs_sb->prepath);
4108 call_rcu(&cifs_sb->rcu, delayed_free);
4109 }
4110
4111 int
4112 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4113 {
4114 int rc = 0;
4115 struct TCP_Server_Info *server = ses->server;
4116
4117 if (!server->ops->need_neg || !server->ops->negotiate)
4118 return -ENOSYS;
4119
4120 /* only send once per connect */
4121 if (!server->ops->need_neg(server))
4122 return 0;
4123
4124 set_credits(server, 1);
4125
4126 rc = server->ops->negotiate(xid, ses);
4127 if (rc == 0) {
4128 spin_lock(&GlobalMid_Lock);
4129 if (server->tcpStatus == CifsNeedNegotiate)
4130 server->tcpStatus = CifsGood;
4131 else
4132 rc = -EHOSTDOWN;
4133 spin_unlock(&GlobalMid_Lock);
4134 }
4135
4136 return rc;
4137 }
4138
4139 int
4140 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4141 struct nls_table *nls_info)
4142 {
4143 int rc = -ENOSYS;
4144 struct TCP_Server_Info *server = ses->server;
4145
4146 ses->capabilities = server->capabilities;
4147 if (linuxExtEnabled == 0)
4148 ses->capabilities &= (~server->vals->cap_unix);
4149
4150 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4151 server->sec_mode, server->capabilities, server->timeAdj);
4152
4153 if (server->ops->sess_setup)
4154 rc = server->ops->sess_setup(xid, ses, nls_info);
4155
4156 if (rc)
4157 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4158
4159 return rc;
4160 }
4161
4162 static int
4163 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4164 {
4165 vol->sectype = ses->sectype;
4166
4167 /* krb5 is special, since we don't need username or pw */
4168 if (vol->sectype == Kerberos)
4169 return 0;
4170
4171 return cifs_set_cifscreds(vol, ses);
4172 }
4173
4174 static struct cifs_tcon *
4175 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4176 {
4177 int rc;
4178 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4179 struct cifs_ses *ses;
4180 struct cifs_tcon *tcon = NULL;
4181 struct smb_vol *vol_info;
4182
4183 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4184 if (vol_info == NULL)
4185 return ERR_PTR(-ENOMEM);
4186
4187 vol_info->local_nls = cifs_sb->local_nls;
4188 vol_info->linux_uid = fsuid;
4189 vol_info->cred_uid = fsuid;
4190 vol_info->UNC = master_tcon->treeName;
4191 vol_info->retry = master_tcon->retry;
4192 vol_info->nocase = master_tcon->nocase;
4193 vol_info->local_lease = master_tcon->local_lease;
4194 vol_info->no_linux_ext = !master_tcon->unix_ext;
4195 vol_info->sectype = master_tcon->ses->sectype;
4196 vol_info->sign = master_tcon->ses->sign;
4197
4198 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4199 if (rc) {
4200 tcon = ERR_PTR(rc);
4201 goto out;
4202 }
4203
4204 /* get a reference for the same TCP session */
4205 spin_lock(&cifs_tcp_ses_lock);
4206 ++master_tcon->ses->server->srv_count;
4207 spin_unlock(&cifs_tcp_ses_lock);
4208
4209 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4210 if (IS_ERR(ses)) {
4211 tcon = (struct cifs_tcon *)ses;
4212 cifs_put_tcp_session(master_tcon->ses->server, 0);
4213 goto out;
4214 }
4215
4216 tcon = cifs_get_tcon(ses, vol_info);
4217 if (IS_ERR(tcon)) {
4218 cifs_put_smb_ses(ses);
4219 goto out;
4220 }
4221
4222 if (cap_unix(ses))
4223 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4224 out:
4225 kfree(vol_info->username);
4226 kfree(vol_info->password);
4227 kfree(vol_info);
4228
4229 return tcon;
4230 }
4231
4232 struct cifs_tcon *
4233 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4234 {
4235 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4236 }
4237
4238 /* find and return a tlink with given uid */
4239 static struct tcon_link *
4240 tlink_rb_search(struct rb_root *root, kuid_t uid)
4241 {
4242 struct rb_node *node = root->rb_node;
4243 struct tcon_link *tlink;
4244
4245 while (node) {
4246 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4247
4248 if (uid_gt(tlink->tl_uid, uid))
4249 node = node->rb_left;
4250 else if (uid_lt(tlink->tl_uid, uid))
4251 node = node->rb_right;
4252 else
4253 return tlink;
4254 }
4255 return NULL;
4256 }
4257
4258 /* insert a tcon_link into the tree */
4259 static void
4260 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4261 {
4262 struct rb_node **new = &(root->rb_node), *parent = NULL;
4263 struct tcon_link *tlink;
4264
4265 while (*new) {
4266 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4267 parent = *new;
4268
4269 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4270 new = &((*new)->rb_left);
4271 else
4272 new = &((*new)->rb_right);
4273 }
4274
4275 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4276 rb_insert_color(&new_tlink->tl_rbnode, root);
4277 }
4278
4279 /*
4280 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4281 * current task.
4282 *
4283 * If the superblock doesn't refer to a multiuser mount, then just return
4284 * the master tcon for the mount.
4285 *
4286 * First, search the rbtree for an existing tcon for this fsuid. If one
4287 * exists, then check to see if it's pending construction. If it is then wait
4288 * for construction to complete. Once it's no longer pending, check to see if
4289 * it failed and either return an error or retry construction, depending on
4290 * the timeout.
4291 *
4292 * If one doesn't exist then insert a new tcon_link struct into the tree and
4293 * try to construct a new one.
4294 */
4295 struct tcon_link *
4296 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4297 {
4298 int ret;
4299 kuid_t fsuid = current_fsuid();
4300 struct tcon_link *tlink, *newtlink;
4301
4302 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4303 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4304
4305 spin_lock(&cifs_sb->tlink_tree_lock);
4306 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4307 if (tlink)
4308 cifs_get_tlink(tlink);
4309 spin_unlock(&cifs_sb->tlink_tree_lock);
4310
4311 if (tlink == NULL) {
4312 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4313 if (newtlink == NULL)
4314 return ERR_PTR(-ENOMEM);
4315 newtlink->tl_uid = fsuid;
4316 newtlink->tl_tcon = ERR_PTR(-EACCES);
4317 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4318 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4319 cifs_get_tlink(newtlink);
4320
4321 spin_lock(&cifs_sb->tlink_tree_lock);
4322 /* was one inserted after previous search? */
4323 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4324 if (tlink) {
4325 cifs_get_tlink(tlink);
4326 spin_unlock(&cifs_sb->tlink_tree_lock);
4327 kfree(newtlink);
4328 goto wait_for_construction;
4329 }
4330 tlink = newtlink;
4331 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4332 spin_unlock(&cifs_sb->tlink_tree_lock);
4333 } else {
4334 wait_for_construction:
4335 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4336 TASK_INTERRUPTIBLE);
4337 if (ret) {
4338 cifs_put_tlink(tlink);
4339 return ERR_PTR(-ERESTARTSYS);
4340 }
4341
4342 /* if it's good, return it */
4343 if (!IS_ERR(tlink->tl_tcon))
4344 return tlink;
4345
4346 /* return error if we tried this already recently */
4347 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4348 cifs_put_tlink(tlink);
4349 return ERR_PTR(-EACCES);
4350 }
4351
4352 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4353 goto wait_for_construction;
4354 }
4355
4356 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4357 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4358 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4359
4360 if (IS_ERR(tlink->tl_tcon)) {
4361 cifs_put_tlink(tlink);
4362 return ERR_PTR(-EACCES);
4363 }
4364
4365 return tlink;
4366 }
4367
4368 /*
4369 * periodic workqueue job that scans tcon_tree for a superblock and closes
4370 * out tcons.
4371 */
4372 static void
4373 cifs_prune_tlinks(struct work_struct *work)
4374 {
4375 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4376 prune_tlinks.work);
4377 struct rb_root *root = &cifs_sb->tlink_tree;
4378 struct rb_node *node = rb_first(root);
4379 struct rb_node *tmp;
4380 struct tcon_link *tlink;
4381
4382 /*
4383 * Because we drop the spinlock in the loop in order to put the tlink
4384 * it's not guarded against removal of links from the tree. The only
4385 * places that remove entries from the tree are this function and
4386 * umounts. Because this function is non-reentrant and is canceled
4387 * before umount can proceed, this is safe.
4388 */
4389 spin_lock(&cifs_sb->tlink_tree_lock);
4390 node = rb_first(root);
4391 while (node != NULL) {
4392 tmp = node;
4393 node = rb_next(tmp);
4394 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4395
4396 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4397 atomic_read(&tlink->tl_count) != 0 ||
4398 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4399 continue;
4400
4401 cifs_get_tlink(tlink);
4402 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4403 rb_erase(tmp, root);
4404
4405 spin_unlock(&cifs_sb->tlink_tree_lock);
4406 cifs_put_tlink(tlink);
4407 spin_lock(&cifs_sb->tlink_tree_lock);
4408 }
4409 spin_unlock(&cifs_sb->tlink_tree_lock);
4410
4411 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4412 TLINK_IDLE_EXPIRE);
4413 }
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