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1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/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->multiRsp || mid_entry->multiEnd)
908 mid_entry->callback(mid_entry);
909 } else if (!server->ops->is_oplock_break ||
910 !server->ops->is_oplock_break(buf, server)) {
911 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
912 atomic_read(&midCount));
913 cifs_dump_mem("Received Data is: ", buf,
914 HEADER_SIZE(server));
915 #ifdef CONFIG_CIFS_DEBUG2
916 if (server->ops->dump_detail)
917 server->ops->dump_detail(buf);
918 cifs_dump_mids(server);
919 #endif /* CIFS_DEBUG2 */
920
921 }
922 } /* end while !EXITING */
923
924 /* buffer usually freed in free_mid - need to free it here on exit */
925 cifs_buf_release(server->bigbuf);
926 if (server->smallbuf) /* no sense logging a debug message if NULL */
927 cifs_small_buf_release(server->smallbuf);
928
929 task_to_wake = xchg(&server->tsk, NULL);
930 clean_demultiplex_info(server);
931
932 /* if server->tsk was NULL then wait for a signal before exiting */
933 if (!task_to_wake) {
934 set_current_state(TASK_INTERRUPTIBLE);
935 while (!signal_pending(current)) {
936 schedule();
937 set_current_state(TASK_INTERRUPTIBLE);
938 }
939 set_current_state(TASK_RUNNING);
940 }
941
942 module_put_and_exit(0);
943 }
944
945 /* extract the host portion of the UNC string */
946 static char *
947 extract_hostname(const char *unc)
948 {
949 const char *src;
950 char *dst, *delim;
951 unsigned int len;
952
953 /* skip double chars at beginning of string */
954 /* BB: check validity of these bytes? */
955 src = unc + 2;
956
957 /* delimiter between hostname and sharename is always '\\' now */
958 delim = strchr(src, '\\');
959 if (!delim)
960 return ERR_PTR(-EINVAL);
961
962 len = delim - src;
963 dst = kmalloc((len + 1), GFP_KERNEL);
964 if (dst == NULL)
965 return ERR_PTR(-ENOMEM);
966
967 memcpy(dst, src, len);
968 dst[len] = '\0';
969
970 return dst;
971 }
972
973 static int get_option_ul(substring_t args[], unsigned long *option)
974 {
975 int rc;
976 char *string;
977
978 string = match_strdup(args);
979 if (string == NULL)
980 return -ENOMEM;
981 rc = kstrtoul(string, 0, option);
982 kfree(string);
983
984 return rc;
985 }
986
987 static int get_option_uid(substring_t args[], kuid_t *result)
988 {
989 unsigned long value;
990 kuid_t uid;
991 int rc;
992
993 rc = get_option_ul(args, &value);
994 if (rc)
995 return rc;
996
997 uid = make_kuid(current_user_ns(), value);
998 if (!uid_valid(uid))
999 return -EINVAL;
1000
1001 *result = uid;
1002 return 0;
1003 }
1004
1005 static int get_option_gid(substring_t args[], kgid_t *result)
1006 {
1007 unsigned long value;
1008 kgid_t gid;
1009 int rc;
1010
1011 rc = get_option_ul(args, &value);
1012 if (rc)
1013 return rc;
1014
1015 gid = make_kgid(current_user_ns(), value);
1016 if (!gid_valid(gid))
1017 return -EINVAL;
1018
1019 *result = gid;
1020 return 0;
1021 }
1022
1023 static int cifs_parse_security_flavors(char *value,
1024 struct smb_vol *vol)
1025 {
1026
1027 substring_t args[MAX_OPT_ARGS];
1028
1029 /*
1030 * With mount options, the last one should win. Reset any existing
1031 * settings back to default.
1032 */
1033 vol->sectype = Unspecified;
1034 vol->sign = false;
1035
1036 switch (match_token(value, cifs_secflavor_tokens, args)) {
1037 case Opt_sec_krb5p:
1038 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1039 return 1;
1040 case Opt_sec_krb5i:
1041 vol->sign = true;
1042 /* Fallthrough */
1043 case Opt_sec_krb5:
1044 vol->sectype = Kerberos;
1045 break;
1046 case Opt_sec_ntlmsspi:
1047 vol->sign = true;
1048 /* Fallthrough */
1049 case Opt_sec_ntlmssp:
1050 vol->sectype = RawNTLMSSP;
1051 break;
1052 case Opt_sec_ntlmi:
1053 vol->sign = true;
1054 /* Fallthrough */
1055 case Opt_ntlm:
1056 vol->sectype = NTLM;
1057 break;
1058 case Opt_sec_ntlmv2i:
1059 vol->sign = true;
1060 /* Fallthrough */
1061 case Opt_sec_ntlmv2:
1062 vol->sectype = NTLMv2;
1063 break;
1064 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1065 case Opt_sec_lanman:
1066 vol->sectype = LANMAN;
1067 break;
1068 #endif
1069 case Opt_sec_none:
1070 vol->nullauth = 1;
1071 break;
1072 default:
1073 cifs_dbg(VFS, "bad security option: %s\n", value);
1074 return 1;
1075 }
1076
1077 return 0;
1078 }
1079
1080 static int
1081 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1082 {
1083 substring_t args[MAX_OPT_ARGS];
1084
1085 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1086 case Opt_cache_loose:
1087 vol->direct_io = false;
1088 vol->strict_io = false;
1089 break;
1090 case Opt_cache_strict:
1091 vol->direct_io = false;
1092 vol->strict_io = true;
1093 break;
1094 case Opt_cache_none:
1095 vol->direct_io = true;
1096 vol->strict_io = false;
1097 break;
1098 default:
1099 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1100 return 1;
1101 }
1102 return 0;
1103 }
1104
1105 static int
1106 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1107 {
1108 substring_t args[MAX_OPT_ARGS];
1109
1110 switch (match_token(value, cifs_smb_version_tokens, args)) {
1111 case Smb_1:
1112 vol->ops = &smb1_operations;
1113 vol->vals = &smb1_values;
1114 break;
1115 #ifdef CONFIG_CIFS_SMB2
1116 case Smb_20:
1117 vol->ops = &smb20_operations;
1118 vol->vals = &smb20_values;
1119 break;
1120 case Smb_21:
1121 vol->ops = &smb21_operations;
1122 vol->vals = &smb21_values;
1123 break;
1124 case Smb_30:
1125 vol->ops = &smb30_operations;
1126 vol->vals = &smb30_values;
1127 break;
1128 case Smb_302:
1129 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1130 vol->vals = &smb302_values;
1131 break;
1132 #ifdef CONFIG_CIFS_SMB311
1133 case Smb_311:
1134 vol->ops = &smb311_operations;
1135 vol->vals = &smb311_values;
1136 break;
1137 #endif /* SMB311 */
1138 #endif
1139 default:
1140 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1141 return 1;
1142 }
1143 return 0;
1144 }
1145
1146 /*
1147 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1148 * fields with the result. Returns 0 on success and an error otherwise.
1149 */
1150 static int
1151 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1152 {
1153 char *pos;
1154 const char *delims = "/\\";
1155 size_t len;
1156
1157 /* make sure we have a valid UNC double delimiter prefix */
1158 len = strspn(devname, delims);
1159 if (len != 2)
1160 return -EINVAL;
1161
1162 /* find delimiter between host and sharename */
1163 pos = strpbrk(devname + 2, delims);
1164 if (!pos)
1165 return -EINVAL;
1166
1167 /* skip past delimiter */
1168 ++pos;
1169
1170 /* now go until next delimiter or end of string */
1171 len = strcspn(pos, delims);
1172
1173 /* move "pos" up to delimiter or NULL */
1174 pos += len;
1175 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1176 if (!vol->UNC)
1177 return -ENOMEM;
1178
1179 convert_delimiter(vol->UNC, '\\');
1180
1181 /* skip any delimiter */
1182 if (*pos == '/' || *pos == '\\')
1183 pos++;
1184
1185 /* If pos is NULL then no prepath */
1186 if (!*pos)
1187 return 0;
1188
1189 vol->prepath = kstrdup(pos, GFP_KERNEL);
1190 if (!vol->prepath)
1191 return -ENOMEM;
1192
1193 return 0;
1194 }
1195
1196 static int
1197 cifs_parse_mount_options(const char *mountdata, const char *devname,
1198 struct smb_vol *vol)
1199 {
1200 char *data, *end;
1201 char *mountdata_copy = NULL, *options;
1202 unsigned int temp_len, i, j;
1203 char separator[2];
1204 short int override_uid = -1;
1205 short int override_gid = -1;
1206 bool uid_specified = false;
1207 bool gid_specified = false;
1208 bool sloppy = false;
1209 char *invalid = NULL;
1210 char *nodename = utsname()->nodename;
1211 char *string = NULL;
1212 char *tmp_end, *value;
1213 char delim;
1214 bool got_ip = false;
1215 unsigned short port = 0;
1216 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1217
1218 separator[0] = ',';
1219 separator[1] = 0;
1220 delim = separator[0];
1221
1222 /* ensure we always start with zeroed-out smb_vol */
1223 memset(vol, 0, sizeof(*vol));
1224
1225 /*
1226 * does not have to be perfect mapping since field is
1227 * informational, only used for servers that do not support
1228 * port 445 and it can be overridden at mount time
1229 */
1230 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1231 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1232 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1233
1234 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1235 /* null target name indicates to use *SMBSERVR default called name
1236 if we end up sending RFC1001 session initialize */
1237 vol->target_rfc1001_name[0] = 0;
1238 vol->cred_uid = current_uid();
1239 vol->linux_uid = current_uid();
1240 vol->linux_gid = current_gid();
1241
1242 /*
1243 * default to SFM style remapping of seven reserved characters
1244 * unless user overrides it or we negotiate CIFS POSIX where
1245 * it is unnecessary. Can not simultaneously use more than one mapping
1246 * since then readdir could list files that open could not open
1247 */
1248 vol->remap = true;
1249
1250 /* default to only allowing write access to owner of the mount */
1251 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1252
1253 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1254 /* default is always to request posix paths. */
1255 vol->posix_paths = 1;
1256 /* default to using server inode numbers where available */
1257 vol->server_ino = 1;
1258
1259 /* default is to use strict cifs caching semantics */
1260 vol->strict_io = true;
1261
1262 vol->actimeo = CIFS_DEF_ACTIMEO;
1263
1264 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1265 vol->ops = &smb1_operations;
1266 vol->vals = &smb1_values;
1267
1268 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1269
1270 if (!mountdata)
1271 goto cifs_parse_mount_err;
1272
1273 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1274 if (!mountdata_copy)
1275 goto cifs_parse_mount_err;
1276
1277 options = mountdata_copy;
1278 end = options + strlen(options);
1279
1280 if (strncmp(options, "sep=", 4) == 0) {
1281 if (options[4] != 0) {
1282 separator[0] = options[4];
1283 options += 5;
1284 } else {
1285 cifs_dbg(FYI, "Null separator not allowed\n");
1286 }
1287 }
1288 vol->backupuid_specified = false; /* no backup intent for a user */
1289 vol->backupgid_specified = false; /* no backup intent for a group */
1290
1291 switch (cifs_parse_devname(devname, vol)) {
1292 case 0:
1293 break;
1294 case -ENOMEM:
1295 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1296 goto cifs_parse_mount_err;
1297 case -EINVAL:
1298 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1299 goto cifs_parse_mount_err;
1300 default:
1301 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1302 goto cifs_parse_mount_err;
1303 }
1304
1305 while ((data = strsep(&options, separator)) != NULL) {
1306 substring_t args[MAX_OPT_ARGS];
1307 unsigned long option;
1308 int token;
1309
1310 if (!*data)
1311 continue;
1312
1313 token = match_token(data, cifs_mount_option_tokens, args);
1314
1315 switch (token) {
1316
1317 /* Ingnore the following */
1318 case Opt_ignore:
1319 break;
1320
1321 /* Boolean values */
1322 case Opt_user_xattr:
1323 vol->no_xattr = 0;
1324 break;
1325 case Opt_nouser_xattr:
1326 vol->no_xattr = 1;
1327 break;
1328 case Opt_forceuid:
1329 override_uid = 1;
1330 break;
1331 case Opt_noforceuid:
1332 override_uid = 0;
1333 break;
1334 case Opt_forcegid:
1335 override_gid = 1;
1336 break;
1337 case Opt_noforcegid:
1338 override_gid = 0;
1339 break;
1340 case Opt_noblocksend:
1341 vol->noblocksnd = 1;
1342 break;
1343 case Opt_noautotune:
1344 vol->noautotune = 1;
1345 break;
1346 case Opt_hard:
1347 vol->retry = 1;
1348 break;
1349 case Opt_soft:
1350 vol->retry = 0;
1351 break;
1352 case Opt_perm:
1353 vol->noperm = 0;
1354 break;
1355 case Opt_noperm:
1356 vol->noperm = 1;
1357 break;
1358 case Opt_mapchars:
1359 vol->sfu_remap = true;
1360 vol->remap = false; /* disable SFM mapping */
1361 break;
1362 case Opt_nomapchars:
1363 vol->sfu_remap = false;
1364 break;
1365 case Opt_mapposix:
1366 vol->remap = true;
1367 vol->sfu_remap = false; /* disable SFU mapping */
1368 break;
1369 case Opt_nomapposix:
1370 vol->remap = false;
1371 break;
1372 case Opt_sfu:
1373 vol->sfu_emul = 1;
1374 break;
1375 case Opt_nosfu:
1376 vol->sfu_emul = 0;
1377 break;
1378 case Opt_nodfs:
1379 vol->nodfs = 1;
1380 break;
1381 case Opt_posixpaths:
1382 vol->posix_paths = 1;
1383 break;
1384 case Opt_noposixpaths:
1385 vol->posix_paths = 0;
1386 break;
1387 case Opt_nounix:
1388 vol->no_linux_ext = 1;
1389 break;
1390 case Opt_nocase:
1391 vol->nocase = 1;
1392 break;
1393 case Opt_brl:
1394 vol->nobrl = 0;
1395 break;
1396 case Opt_nobrl:
1397 vol->nobrl = 1;
1398 /*
1399 * turn off mandatory locking in mode
1400 * if remote locking is turned off since the
1401 * local vfs will do advisory
1402 */
1403 if (vol->file_mode ==
1404 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1405 vol->file_mode = S_IALLUGO;
1406 break;
1407 case Opt_forcemandatorylock:
1408 vol->mand_lock = 1;
1409 break;
1410 case Opt_setuids:
1411 vol->setuids = 1;
1412 break;
1413 case Opt_nosetuids:
1414 vol->setuids = 0;
1415 break;
1416 case Opt_setuidfromacl:
1417 vol->setuidfromacl = 1;
1418 break;
1419 case Opt_dynperm:
1420 vol->dynperm = true;
1421 break;
1422 case Opt_nodynperm:
1423 vol->dynperm = false;
1424 break;
1425 case Opt_nohard:
1426 vol->retry = 0;
1427 break;
1428 case Opt_nosoft:
1429 vol->retry = 1;
1430 break;
1431 case Opt_nointr:
1432 vol->intr = 0;
1433 break;
1434 case Opt_intr:
1435 vol->intr = 1;
1436 break;
1437 case Opt_nostrictsync:
1438 vol->nostrictsync = 1;
1439 break;
1440 case Opt_strictsync:
1441 vol->nostrictsync = 0;
1442 break;
1443 case Opt_serverino:
1444 vol->server_ino = 1;
1445 break;
1446 case Opt_noserverino:
1447 vol->server_ino = 0;
1448 break;
1449 case Opt_rwpidforward:
1450 vol->rwpidforward = 1;
1451 break;
1452 case Opt_cifsacl:
1453 vol->cifs_acl = 1;
1454 break;
1455 case Opt_nocifsacl:
1456 vol->cifs_acl = 0;
1457 break;
1458 case Opt_acl:
1459 vol->no_psx_acl = 0;
1460 break;
1461 case Opt_noacl:
1462 vol->no_psx_acl = 1;
1463 break;
1464 case Opt_locallease:
1465 vol->local_lease = 1;
1466 break;
1467 case Opt_sign:
1468 vol->sign = true;
1469 break;
1470 case Opt_seal:
1471 /* we do not do the following in secFlags because seal
1472 * is a per tree connection (mount) not a per socket
1473 * or per-smb connection option in the protocol
1474 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1475 */
1476 vol->seal = 1;
1477 break;
1478 case Opt_noac:
1479 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1480 break;
1481 case Opt_fsc:
1482 #ifndef CONFIG_CIFS_FSCACHE
1483 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1484 goto cifs_parse_mount_err;
1485 #endif
1486 vol->fsc = true;
1487 break;
1488 case Opt_mfsymlinks:
1489 vol->mfsymlinks = true;
1490 break;
1491 case Opt_multiuser:
1492 vol->multiuser = true;
1493 break;
1494 case Opt_sloppy:
1495 sloppy = true;
1496 break;
1497 case Opt_nosharesock:
1498 vol->nosharesock = true;
1499 break;
1500 case Opt_nopersistent:
1501 vol->nopersistent = true;
1502 if (vol->persistent) {
1503 cifs_dbg(VFS,
1504 "persistenthandles mount options conflict\n");
1505 goto cifs_parse_mount_err;
1506 }
1507 break;
1508 case Opt_persistent:
1509 vol->persistent = true;
1510 if ((vol->nopersistent) || (vol->resilient)) {
1511 cifs_dbg(VFS,
1512 "persistenthandles mount options conflict\n");
1513 goto cifs_parse_mount_err;
1514 }
1515 break;
1516 case Opt_resilient:
1517 vol->resilient = true;
1518 if (vol->persistent) {
1519 cifs_dbg(VFS,
1520 "persistenthandles mount options conflict\n");
1521 goto cifs_parse_mount_err;
1522 }
1523 break;
1524 case Opt_noresilient:
1525 vol->resilient = false; /* already the default */
1526 break;
1527 case Opt_domainauto:
1528 vol->domainauto = true;
1529 break;
1530
1531 /* Numeric Values */
1532 case Opt_backupuid:
1533 if (get_option_uid(args, &vol->backupuid)) {
1534 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1535 __func__);
1536 goto cifs_parse_mount_err;
1537 }
1538 vol->backupuid_specified = true;
1539 break;
1540 case Opt_backupgid:
1541 if (get_option_gid(args, &vol->backupgid)) {
1542 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1543 __func__);
1544 goto cifs_parse_mount_err;
1545 }
1546 vol->backupgid_specified = true;
1547 break;
1548 case Opt_uid:
1549 if (get_option_uid(args, &vol->linux_uid)) {
1550 cifs_dbg(VFS, "%s: Invalid uid value\n",
1551 __func__);
1552 goto cifs_parse_mount_err;
1553 }
1554 uid_specified = true;
1555 break;
1556 case Opt_cruid:
1557 if (get_option_uid(args, &vol->cred_uid)) {
1558 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1559 __func__);
1560 goto cifs_parse_mount_err;
1561 }
1562 break;
1563 case Opt_gid:
1564 if (get_option_gid(args, &vol->linux_gid)) {
1565 cifs_dbg(VFS, "%s: Invalid gid value\n",
1566 __func__);
1567 goto cifs_parse_mount_err;
1568 }
1569 gid_specified = true;
1570 break;
1571 case Opt_file_mode:
1572 if (get_option_ul(args, &option)) {
1573 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1574 __func__);
1575 goto cifs_parse_mount_err;
1576 }
1577 vol->file_mode = option;
1578 break;
1579 case Opt_dirmode:
1580 if (get_option_ul(args, &option)) {
1581 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1582 __func__);
1583 goto cifs_parse_mount_err;
1584 }
1585 vol->dir_mode = option;
1586 break;
1587 case Opt_port:
1588 if (get_option_ul(args, &option) ||
1589 option > USHRT_MAX) {
1590 cifs_dbg(VFS, "%s: Invalid port value\n",
1591 __func__);
1592 goto cifs_parse_mount_err;
1593 }
1594 port = (unsigned short)option;
1595 break;
1596 case Opt_rsize:
1597 if (get_option_ul(args, &option)) {
1598 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1599 __func__);
1600 goto cifs_parse_mount_err;
1601 }
1602 vol->rsize = option;
1603 break;
1604 case Opt_wsize:
1605 if (get_option_ul(args, &option)) {
1606 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1607 __func__);
1608 goto cifs_parse_mount_err;
1609 }
1610 vol->wsize = option;
1611 break;
1612 case Opt_actimeo:
1613 if (get_option_ul(args, &option)) {
1614 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1615 __func__);
1616 goto cifs_parse_mount_err;
1617 }
1618 vol->actimeo = HZ * option;
1619 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1620 cifs_dbg(VFS, "attribute cache timeout too large\n");
1621 goto cifs_parse_mount_err;
1622 }
1623 break;
1624 case Opt_echo_interval:
1625 if (get_option_ul(args, &option)) {
1626 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1627 __func__);
1628 goto cifs_parse_mount_err;
1629 }
1630 vol->echo_interval = option;
1631 break;
1632 case Opt_snapshot:
1633 if (get_option_ul(args, &option)) {
1634 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1635 __func__);
1636 goto cifs_parse_mount_err;
1637 }
1638 vol->snapshot_time = option;
1639 break;
1640 case Opt_max_credits:
1641 if (get_option_ul(args, &option) || (option < 20) ||
1642 (option > 60000)) {
1643 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1644 __func__);
1645 goto cifs_parse_mount_err;
1646 }
1647 vol->max_credits = option;
1648 break;
1649
1650 /* String Arguments */
1651
1652 case Opt_blank_user:
1653 /* null user, ie. anonymous authentication */
1654 vol->nullauth = 1;
1655 vol->username = NULL;
1656 break;
1657 case Opt_user:
1658 string = match_strdup(args);
1659 if (string == NULL)
1660 goto out_nomem;
1661
1662 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1663 CIFS_MAX_USERNAME_LEN) {
1664 pr_warn("CIFS: username too long\n");
1665 goto cifs_parse_mount_err;
1666 }
1667
1668 kfree(vol->username);
1669 vol->username = kstrdup(string, GFP_KERNEL);
1670 if (!vol->username)
1671 goto cifs_parse_mount_err;
1672 break;
1673 case Opt_blank_pass:
1674 /* passwords have to be handled differently
1675 * to allow the character used for deliminator
1676 * to be passed within them
1677 */
1678
1679 /*
1680 * Check if this is a case where the password
1681 * starts with a delimiter
1682 */
1683 tmp_end = strchr(data, '=');
1684 tmp_end++;
1685 if (!(tmp_end < end && tmp_end[1] == delim)) {
1686 /* No it is not. Set the password to NULL */
1687 kfree(vol->password);
1688 vol->password = NULL;
1689 break;
1690 }
1691 /* Yes it is. Drop down to Opt_pass below.*/
1692 case Opt_pass:
1693 /* Obtain the value string */
1694 value = strchr(data, '=');
1695 value++;
1696
1697 /* Set tmp_end to end of the string */
1698 tmp_end = (char *) value + strlen(value);
1699
1700 /* Check if following character is the deliminator
1701 * If yes, we have encountered a double deliminator
1702 * reset the NULL character to the deliminator
1703 */
1704 if (tmp_end < end && tmp_end[1] == delim) {
1705 tmp_end[0] = delim;
1706
1707 /* Keep iterating until we get to a single
1708 * deliminator OR the end
1709 */
1710 while ((tmp_end = strchr(tmp_end, delim))
1711 != NULL && (tmp_end[1] == delim)) {
1712 tmp_end = (char *) &tmp_end[2];
1713 }
1714
1715 /* Reset var options to point to next element */
1716 if (tmp_end) {
1717 tmp_end[0] = '\0';
1718 options = (char *) &tmp_end[1];
1719 } else
1720 /* Reached the end of the mount option
1721 * string */
1722 options = end;
1723 }
1724
1725 kfree(vol->password);
1726 /* Now build new password string */
1727 temp_len = strlen(value);
1728 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1729 if (vol->password == NULL) {
1730 pr_warn("CIFS: no memory for password\n");
1731 goto cifs_parse_mount_err;
1732 }
1733
1734 for (i = 0, j = 0; i < temp_len; i++, j++) {
1735 vol->password[j] = value[i];
1736 if ((value[i] == delim) &&
1737 value[i+1] == delim)
1738 /* skip the second deliminator */
1739 i++;
1740 }
1741 vol->password[j] = '\0';
1742 break;
1743 case Opt_blank_ip:
1744 /* FIXME: should this be an error instead? */
1745 got_ip = false;
1746 break;
1747 case Opt_ip:
1748 string = match_strdup(args);
1749 if (string == NULL)
1750 goto out_nomem;
1751
1752 if (!cifs_convert_address(dstaddr, string,
1753 strlen(string))) {
1754 pr_err("CIFS: bad ip= option (%s).\n", string);
1755 goto cifs_parse_mount_err;
1756 }
1757 got_ip = true;
1758 break;
1759 case Opt_domain:
1760 string = match_strdup(args);
1761 if (string == NULL)
1762 goto out_nomem;
1763
1764 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1765 == CIFS_MAX_DOMAINNAME_LEN) {
1766 pr_warn("CIFS: domain name too long\n");
1767 goto cifs_parse_mount_err;
1768 }
1769
1770 kfree(vol->domainname);
1771 vol->domainname = kstrdup(string, GFP_KERNEL);
1772 if (!vol->domainname) {
1773 pr_warn("CIFS: no memory for domainname\n");
1774 goto cifs_parse_mount_err;
1775 }
1776 cifs_dbg(FYI, "Domain name set\n");
1777 break;
1778 case Opt_srcaddr:
1779 string = match_strdup(args);
1780 if (string == NULL)
1781 goto out_nomem;
1782
1783 if (!cifs_convert_address(
1784 (struct sockaddr *)&vol->srcaddr,
1785 string, strlen(string))) {
1786 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1787 string);
1788 goto cifs_parse_mount_err;
1789 }
1790 break;
1791 case Opt_iocharset:
1792 string = match_strdup(args);
1793 if (string == NULL)
1794 goto out_nomem;
1795
1796 if (strnlen(string, 1024) >= 65) {
1797 pr_warn("CIFS: iocharset name too long.\n");
1798 goto cifs_parse_mount_err;
1799 }
1800
1801 if (strncasecmp(string, "default", 7) != 0) {
1802 kfree(vol->iocharset);
1803 vol->iocharset = kstrdup(string,
1804 GFP_KERNEL);
1805 if (!vol->iocharset) {
1806 pr_warn("CIFS: no memory for charset\n");
1807 goto cifs_parse_mount_err;
1808 }
1809 }
1810 /* if iocharset not set then load_nls_default
1811 * is used by caller
1812 */
1813 cifs_dbg(FYI, "iocharset set to %s\n", string);
1814 break;
1815 case Opt_netbiosname:
1816 string = match_strdup(args);
1817 if (string == NULL)
1818 goto out_nomem;
1819
1820 memset(vol->source_rfc1001_name, 0x20,
1821 RFC1001_NAME_LEN);
1822 /*
1823 * FIXME: are there cases in which a comma can
1824 * be valid in workstation netbios name (and
1825 * need special handling)?
1826 */
1827 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1828 /* don't ucase netbiosname for user */
1829 if (string[i] == 0)
1830 break;
1831 vol->source_rfc1001_name[i] = string[i];
1832 }
1833 /* The string has 16th byte zero still from
1834 * set at top of the function
1835 */
1836 if (i == RFC1001_NAME_LEN && string[i] != 0)
1837 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1838 break;
1839 case Opt_servern:
1840 /* servernetbiosname specified override *SMBSERVER */
1841 string = match_strdup(args);
1842 if (string == NULL)
1843 goto out_nomem;
1844
1845 /* last byte, type, is 0x20 for servr type */
1846 memset(vol->target_rfc1001_name, 0x20,
1847 RFC1001_NAME_LEN_WITH_NULL);
1848
1849 /* BB are there cases in which a comma can be
1850 valid in this workstation netbios name
1851 (and need special handling)? */
1852
1853 /* user or mount helper must uppercase the
1854 netbios name */
1855 for (i = 0; i < 15; i++) {
1856 if (string[i] == 0)
1857 break;
1858 vol->target_rfc1001_name[i] = string[i];
1859 }
1860 /* The string has 16th byte zero still from
1861 set at top of the function */
1862 if (i == RFC1001_NAME_LEN && string[i] != 0)
1863 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1864 break;
1865 case Opt_ver:
1866 string = match_strdup(args);
1867 if (string == NULL)
1868 goto out_nomem;
1869
1870 if (strncasecmp(string, "1", 1) == 0) {
1871 /* This is the default */
1872 break;
1873 }
1874 /* For all other value, error */
1875 pr_warn("CIFS: Invalid version specified\n");
1876 goto cifs_parse_mount_err;
1877 case Opt_vers:
1878 string = match_strdup(args);
1879 if (string == NULL)
1880 goto out_nomem;
1881
1882 if (cifs_parse_smb_version(string, vol) != 0)
1883 goto cifs_parse_mount_err;
1884 break;
1885 case Opt_sec:
1886 string = match_strdup(args);
1887 if (string == NULL)
1888 goto out_nomem;
1889
1890 if (cifs_parse_security_flavors(string, vol) != 0)
1891 goto cifs_parse_mount_err;
1892 break;
1893 case Opt_cache:
1894 string = match_strdup(args);
1895 if (string == NULL)
1896 goto out_nomem;
1897
1898 if (cifs_parse_cache_flavor(string, vol) != 0)
1899 goto cifs_parse_mount_err;
1900 break;
1901 default:
1902 /*
1903 * An option we don't recognize. Save it off for later
1904 * if we haven't already found one
1905 */
1906 if (!invalid)
1907 invalid = data;
1908 break;
1909 }
1910 /* Free up any allocated string */
1911 kfree(string);
1912 string = NULL;
1913 }
1914
1915 if (!sloppy && invalid) {
1916 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1917 goto cifs_parse_mount_err;
1918 }
1919
1920 #ifndef CONFIG_KEYS
1921 /* Muliuser mounts require CONFIG_KEYS support */
1922 if (vol->multiuser) {
1923 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1924 goto cifs_parse_mount_err;
1925 }
1926 #endif
1927 if (!vol->UNC) {
1928 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1929 goto cifs_parse_mount_err;
1930 }
1931
1932 /* make sure UNC has a share name */
1933 if (!strchr(vol->UNC + 3, '\\')) {
1934 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1935 goto cifs_parse_mount_err;
1936 }
1937
1938 if (!got_ip) {
1939 /* No ip= option specified? Try to get it from UNC */
1940 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1941 strlen(&vol->UNC[2]))) {
1942 pr_err("Unable to determine destination address.\n");
1943 goto cifs_parse_mount_err;
1944 }
1945 }
1946
1947 /* set the port that we got earlier */
1948 cifs_set_port(dstaddr, port);
1949
1950 if (uid_specified)
1951 vol->override_uid = override_uid;
1952 else if (override_uid == 1)
1953 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1954
1955 if (gid_specified)
1956 vol->override_gid = override_gid;
1957 else if (override_gid == 1)
1958 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1959
1960 kfree(mountdata_copy);
1961 return 0;
1962
1963 out_nomem:
1964 pr_warn("Could not allocate temporary buffer\n");
1965 cifs_parse_mount_err:
1966 kfree(string);
1967 kfree(mountdata_copy);
1968 return 1;
1969 }
1970
1971 /** Returns true if srcaddr isn't specified and rhs isn't
1972 * specified, or if srcaddr is specified and
1973 * matches the IP address of the rhs argument.
1974 */
1975 static bool
1976 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1977 {
1978 switch (srcaddr->sa_family) {
1979 case AF_UNSPEC:
1980 return (rhs->sa_family == AF_UNSPEC);
1981 case AF_INET: {
1982 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1983 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1984 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1985 }
1986 case AF_INET6: {
1987 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1988 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1989 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1990 }
1991 default:
1992 WARN_ON(1);
1993 return false; /* don't expect to be here */
1994 }
1995 }
1996
1997 /*
1998 * If no port is specified in addr structure, we try to match with 445 port
1999 * and if it fails - with 139 ports. It should be called only if address
2000 * families of server and addr are equal.
2001 */
2002 static bool
2003 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2004 {
2005 __be16 port, *sport;
2006
2007 switch (addr->sa_family) {
2008 case AF_INET:
2009 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2010 port = ((struct sockaddr_in *) addr)->sin_port;
2011 break;
2012 case AF_INET6:
2013 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2014 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2015 break;
2016 default:
2017 WARN_ON(1);
2018 return false;
2019 }
2020
2021 if (!port) {
2022 port = htons(CIFS_PORT);
2023 if (port == *sport)
2024 return true;
2025
2026 port = htons(RFC1001_PORT);
2027 }
2028
2029 return port == *sport;
2030 }
2031
2032 static bool
2033 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2034 struct sockaddr *srcaddr)
2035 {
2036 switch (addr->sa_family) {
2037 case AF_INET: {
2038 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2039 struct sockaddr_in *srv_addr4 =
2040 (struct sockaddr_in *)&server->dstaddr;
2041
2042 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2043 return false;
2044 break;
2045 }
2046 case AF_INET6: {
2047 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2048 struct sockaddr_in6 *srv_addr6 =
2049 (struct sockaddr_in6 *)&server->dstaddr;
2050
2051 if (!ipv6_addr_equal(&addr6->sin6_addr,
2052 &srv_addr6->sin6_addr))
2053 return false;
2054 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2055 return false;
2056 break;
2057 }
2058 default:
2059 WARN_ON(1);
2060 return false; /* don't expect to be here */
2061 }
2062
2063 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2064 return false;
2065
2066 return true;
2067 }
2068
2069 static bool
2070 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2071 {
2072 /*
2073 * The select_sectype function should either return the vol->sectype
2074 * that was specified, or "Unspecified" if that sectype was not
2075 * compatible with the given NEGOTIATE request.
2076 */
2077 if (server->ops->select_sectype(server, vol->sectype)
2078 == Unspecified)
2079 return false;
2080
2081 /*
2082 * Now check if signing mode is acceptable. No need to check
2083 * global_secflags at this point since if MUST_SIGN is set then
2084 * the server->sign had better be too.
2085 */
2086 if (vol->sign && !server->sign)
2087 return false;
2088
2089 return true;
2090 }
2091
2092 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2093 {
2094 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2095
2096 if (vol->nosharesock)
2097 return 0;
2098
2099 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2100 return 0;
2101
2102 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2103 return 0;
2104
2105 if (!match_address(server, addr,
2106 (struct sockaddr *)&vol->srcaddr))
2107 return 0;
2108
2109 if (!match_port(server, addr))
2110 return 0;
2111
2112 if (!match_security(server, vol))
2113 return 0;
2114
2115 if (server->echo_interval != vol->echo_interval * HZ)
2116 return 0;
2117
2118 return 1;
2119 }
2120
2121 static struct TCP_Server_Info *
2122 cifs_find_tcp_session(struct smb_vol *vol)
2123 {
2124 struct TCP_Server_Info *server;
2125
2126 spin_lock(&cifs_tcp_ses_lock);
2127 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2128 if (!match_server(server, vol))
2129 continue;
2130
2131 ++server->srv_count;
2132 spin_unlock(&cifs_tcp_ses_lock);
2133 cifs_dbg(FYI, "Existing tcp session with server found\n");
2134 return server;
2135 }
2136 spin_unlock(&cifs_tcp_ses_lock);
2137 return NULL;
2138 }
2139
2140 void
2141 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2142 {
2143 struct task_struct *task;
2144
2145 spin_lock(&cifs_tcp_ses_lock);
2146 if (--server->srv_count > 0) {
2147 spin_unlock(&cifs_tcp_ses_lock);
2148 return;
2149 }
2150
2151 put_net(cifs_net_ns(server));
2152
2153 list_del_init(&server->tcp_ses_list);
2154 spin_unlock(&cifs_tcp_ses_lock);
2155
2156 cancel_delayed_work_sync(&server->echo);
2157
2158 #ifdef CONFIG_CIFS_SMB2
2159 if (from_reconnect)
2160 /*
2161 * Avoid deadlock here: reconnect work calls
2162 * cifs_put_tcp_session() at its end. Need to be sure
2163 * that reconnect work does nothing with server pointer after
2164 * that step.
2165 */
2166 cancel_delayed_work(&server->reconnect);
2167 else
2168 cancel_delayed_work_sync(&server->reconnect);
2169 #endif
2170
2171 spin_lock(&GlobalMid_Lock);
2172 server->tcpStatus = CifsExiting;
2173 spin_unlock(&GlobalMid_Lock);
2174
2175 cifs_crypto_secmech_release(server);
2176 cifs_fscache_release_client_cookie(server);
2177
2178 kfree(server->session_key.response);
2179 server->session_key.response = NULL;
2180 server->session_key.len = 0;
2181
2182 task = xchg(&server->tsk, NULL);
2183 if (task)
2184 force_sig(SIGKILL, task);
2185 }
2186
2187 static struct TCP_Server_Info *
2188 cifs_get_tcp_session(struct smb_vol *volume_info)
2189 {
2190 struct TCP_Server_Info *tcp_ses = NULL;
2191 int rc;
2192
2193 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2194
2195 /* see if we already have a matching tcp_ses */
2196 tcp_ses = cifs_find_tcp_session(volume_info);
2197 if (tcp_ses)
2198 return tcp_ses;
2199
2200 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2201 if (!tcp_ses) {
2202 rc = -ENOMEM;
2203 goto out_err;
2204 }
2205
2206 tcp_ses->ops = volume_info->ops;
2207 tcp_ses->vals = volume_info->vals;
2208 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2209 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2210 if (IS_ERR(tcp_ses->hostname)) {
2211 rc = PTR_ERR(tcp_ses->hostname);
2212 goto out_err_crypto_release;
2213 }
2214
2215 tcp_ses->noblocksnd = volume_info->noblocksnd;
2216 tcp_ses->noautotune = volume_info->noautotune;
2217 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2218 tcp_ses->in_flight = 0;
2219 tcp_ses->credits = 1;
2220 init_waitqueue_head(&tcp_ses->response_q);
2221 init_waitqueue_head(&tcp_ses->request_q);
2222 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2223 mutex_init(&tcp_ses->srv_mutex);
2224 memcpy(tcp_ses->workstation_RFC1001_name,
2225 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2226 memcpy(tcp_ses->server_RFC1001_name,
2227 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2228 tcp_ses->session_estab = false;
2229 tcp_ses->sequence_number = 0;
2230 tcp_ses->lstrp = jiffies;
2231 spin_lock_init(&tcp_ses->req_lock);
2232 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2233 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2234 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2235 #ifdef CONFIG_CIFS_SMB2
2236 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2237 mutex_init(&tcp_ses->reconnect_mutex);
2238 #endif
2239 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2240 sizeof(tcp_ses->srcaddr));
2241 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2242 sizeof(tcp_ses->dstaddr));
2243 #ifdef CONFIG_CIFS_SMB2
2244 generate_random_uuid(tcp_ses->client_guid);
2245 #endif
2246 /*
2247 * at this point we are the only ones with the pointer
2248 * to the struct since the kernel thread not created yet
2249 * no need to spinlock this init of tcpStatus or srv_count
2250 */
2251 tcp_ses->tcpStatus = CifsNew;
2252 ++tcp_ses->srv_count;
2253
2254 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2255 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2256 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2257 else
2258 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2259
2260 rc = ip_connect(tcp_ses);
2261 if (rc < 0) {
2262 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2263 goto out_err_crypto_release;
2264 }
2265
2266 /*
2267 * since we're in a cifs function already, we know that
2268 * this will succeed. No need for try_module_get().
2269 */
2270 __module_get(THIS_MODULE);
2271 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2272 tcp_ses, "cifsd");
2273 if (IS_ERR(tcp_ses->tsk)) {
2274 rc = PTR_ERR(tcp_ses->tsk);
2275 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2276 module_put(THIS_MODULE);
2277 goto out_err_crypto_release;
2278 }
2279 tcp_ses->tcpStatus = CifsNeedNegotiate;
2280
2281 /* thread spawned, put it on the list */
2282 spin_lock(&cifs_tcp_ses_lock);
2283 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2284 spin_unlock(&cifs_tcp_ses_lock);
2285
2286 cifs_fscache_get_client_cookie(tcp_ses);
2287
2288 /* queue echo request delayed work */
2289 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2290
2291 return tcp_ses;
2292
2293 out_err_crypto_release:
2294 cifs_crypto_secmech_release(tcp_ses);
2295
2296 put_net(cifs_net_ns(tcp_ses));
2297
2298 out_err:
2299 if (tcp_ses) {
2300 if (!IS_ERR(tcp_ses->hostname))
2301 kfree(tcp_ses->hostname);
2302 if (tcp_ses->ssocket)
2303 sock_release(tcp_ses->ssocket);
2304 kfree(tcp_ses);
2305 }
2306 return ERR_PTR(rc);
2307 }
2308
2309 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2310 {
2311 if (vol->sectype != Unspecified &&
2312 vol->sectype != ses->sectype)
2313 return 0;
2314
2315 switch (ses->sectype) {
2316 case Kerberos:
2317 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2318 return 0;
2319 break;
2320 default:
2321 /* NULL username means anonymous session */
2322 if (ses->user_name == NULL) {
2323 if (!vol->nullauth)
2324 return 0;
2325 break;
2326 }
2327
2328 /* anything else takes username/password */
2329 if (strncmp(ses->user_name,
2330 vol->username ? vol->username : "",
2331 CIFS_MAX_USERNAME_LEN))
2332 return 0;
2333 if ((vol->username && strlen(vol->username) != 0) &&
2334 ses->password != NULL &&
2335 strncmp(ses->password,
2336 vol->password ? vol->password : "",
2337 CIFS_MAX_PASSWORD_LEN))
2338 return 0;
2339 }
2340 return 1;
2341 }
2342
2343 static struct cifs_ses *
2344 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2345 {
2346 struct cifs_ses *ses;
2347
2348 spin_lock(&cifs_tcp_ses_lock);
2349 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2350 if (ses->status == CifsExiting)
2351 continue;
2352 if (!match_session(ses, vol))
2353 continue;
2354 ++ses->ses_count;
2355 spin_unlock(&cifs_tcp_ses_lock);
2356 return ses;
2357 }
2358 spin_unlock(&cifs_tcp_ses_lock);
2359 return NULL;
2360 }
2361
2362 static void
2363 cifs_put_smb_ses(struct cifs_ses *ses)
2364 {
2365 unsigned int rc, xid;
2366 struct TCP_Server_Info *server = ses->server;
2367
2368 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2369
2370 spin_lock(&cifs_tcp_ses_lock);
2371 if (ses->status == CifsExiting) {
2372 spin_unlock(&cifs_tcp_ses_lock);
2373 return;
2374 }
2375 if (--ses->ses_count > 0) {
2376 spin_unlock(&cifs_tcp_ses_lock);
2377 return;
2378 }
2379 if (ses->status == CifsGood)
2380 ses->status = CifsExiting;
2381 spin_unlock(&cifs_tcp_ses_lock);
2382
2383 if (ses->status == CifsExiting && server->ops->logoff) {
2384 xid = get_xid();
2385 rc = server->ops->logoff(xid, ses);
2386 if (rc)
2387 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2388 __func__, rc);
2389 _free_xid(xid);
2390 }
2391
2392 spin_lock(&cifs_tcp_ses_lock);
2393 list_del_init(&ses->smb_ses_list);
2394 spin_unlock(&cifs_tcp_ses_lock);
2395
2396 sesInfoFree(ses);
2397 cifs_put_tcp_session(server, 0);
2398 }
2399
2400 #ifdef CONFIG_KEYS
2401
2402 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2403 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2404
2405 /* Populate username and pw fields from keyring if possible */
2406 static int
2407 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2408 {
2409 int rc = 0;
2410 const char *delim, *payload;
2411 char *desc;
2412 ssize_t len;
2413 struct key *key;
2414 struct TCP_Server_Info *server = ses->server;
2415 struct sockaddr_in *sa;
2416 struct sockaddr_in6 *sa6;
2417 const struct user_key_payload *upayload;
2418
2419 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2420 if (!desc)
2421 return -ENOMEM;
2422
2423 /* try to find an address key first */
2424 switch (server->dstaddr.ss_family) {
2425 case AF_INET:
2426 sa = (struct sockaddr_in *)&server->dstaddr;
2427 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2428 break;
2429 case AF_INET6:
2430 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2431 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2432 break;
2433 default:
2434 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2435 server->dstaddr.ss_family);
2436 rc = -EINVAL;
2437 goto out_err;
2438 }
2439
2440 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2441 key = request_key(&key_type_logon, desc, "");
2442 if (IS_ERR(key)) {
2443 if (!ses->domainName) {
2444 cifs_dbg(FYI, "domainName is NULL\n");
2445 rc = PTR_ERR(key);
2446 goto out_err;
2447 }
2448
2449 /* didn't work, try to find a domain key */
2450 sprintf(desc, "cifs:d:%s", ses->domainName);
2451 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2452 key = request_key(&key_type_logon, desc, "");
2453 if (IS_ERR(key)) {
2454 rc = PTR_ERR(key);
2455 goto out_err;
2456 }
2457 }
2458
2459 down_read(&key->sem);
2460 upayload = user_key_payload_locked(key);
2461 if (IS_ERR_OR_NULL(upayload)) {
2462 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2463 goto out_key_put;
2464 }
2465
2466 /* find first : in payload */
2467 payload = upayload->data;
2468 delim = strnchr(payload, upayload->datalen, ':');
2469 cifs_dbg(FYI, "payload=%s\n", payload);
2470 if (!delim) {
2471 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2472 upayload->datalen);
2473 rc = -EINVAL;
2474 goto out_key_put;
2475 }
2476
2477 len = delim - payload;
2478 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2479 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2480 len);
2481 rc = -EINVAL;
2482 goto out_key_put;
2483 }
2484
2485 vol->username = kstrndup(payload, len, GFP_KERNEL);
2486 if (!vol->username) {
2487 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2488 len);
2489 rc = -ENOMEM;
2490 goto out_key_put;
2491 }
2492 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2493
2494 len = key->datalen - (len + 1);
2495 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2496 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2497 rc = -EINVAL;
2498 kfree(vol->username);
2499 vol->username = NULL;
2500 goto out_key_put;
2501 }
2502
2503 ++delim;
2504 vol->password = kstrndup(delim, len, GFP_KERNEL);
2505 if (!vol->password) {
2506 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2507 len);
2508 rc = -ENOMEM;
2509 kfree(vol->username);
2510 vol->username = NULL;
2511 goto out_key_put;
2512 }
2513
2514 out_key_put:
2515 up_read(&key->sem);
2516 key_put(key);
2517 out_err:
2518 kfree(desc);
2519 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2520 return rc;
2521 }
2522 #else /* ! CONFIG_KEYS */
2523 static inline int
2524 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2525 struct cifs_ses *ses __attribute__((unused)))
2526 {
2527 return -ENOSYS;
2528 }
2529 #endif /* CONFIG_KEYS */
2530
2531 static struct cifs_ses *
2532 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2533 {
2534 int rc = -ENOMEM;
2535 unsigned int xid;
2536 struct cifs_ses *ses;
2537 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2538 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2539
2540 xid = get_xid();
2541
2542 ses = cifs_find_smb_ses(server, volume_info);
2543 if (ses) {
2544 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2545 ses->status);
2546
2547 mutex_lock(&ses->session_mutex);
2548 rc = cifs_negotiate_protocol(xid, ses);
2549 if (rc) {
2550 mutex_unlock(&ses->session_mutex);
2551 /* problem -- put our ses reference */
2552 cifs_put_smb_ses(ses);
2553 free_xid(xid);
2554 return ERR_PTR(rc);
2555 }
2556 if (ses->need_reconnect) {
2557 cifs_dbg(FYI, "Session needs reconnect\n");
2558 rc = cifs_setup_session(xid, ses,
2559 volume_info->local_nls);
2560 if (rc) {
2561 mutex_unlock(&ses->session_mutex);
2562 /* problem -- put our reference */
2563 cifs_put_smb_ses(ses);
2564 free_xid(xid);
2565 return ERR_PTR(rc);
2566 }
2567 }
2568 mutex_unlock(&ses->session_mutex);
2569
2570 /* existing SMB ses has a server reference already */
2571 cifs_put_tcp_session(server, 0);
2572 free_xid(xid);
2573 return ses;
2574 }
2575
2576 cifs_dbg(FYI, "Existing smb sess not found\n");
2577 ses = sesInfoAlloc();
2578 if (ses == NULL)
2579 goto get_ses_fail;
2580
2581 /* new SMB session uses our server ref */
2582 ses->server = server;
2583 if (server->dstaddr.ss_family == AF_INET6)
2584 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2585 else
2586 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2587
2588 if (volume_info->username) {
2589 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2590 if (!ses->user_name)
2591 goto get_ses_fail;
2592 }
2593
2594 /* volume_info->password freed at unmount */
2595 if (volume_info->password) {
2596 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2597 if (!ses->password)
2598 goto get_ses_fail;
2599 }
2600 if (volume_info->domainname) {
2601 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2602 if (!ses->domainName)
2603 goto get_ses_fail;
2604 }
2605 if (volume_info->domainauto)
2606 ses->domainAuto = volume_info->domainauto;
2607 ses->cred_uid = volume_info->cred_uid;
2608 ses->linux_uid = volume_info->linux_uid;
2609
2610 ses->sectype = volume_info->sectype;
2611 ses->sign = volume_info->sign;
2612
2613 mutex_lock(&ses->session_mutex);
2614 rc = cifs_negotiate_protocol(xid, ses);
2615 if (!rc)
2616 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2617 mutex_unlock(&ses->session_mutex);
2618 if (rc)
2619 goto get_ses_fail;
2620
2621 /* success, put it on the list */
2622 spin_lock(&cifs_tcp_ses_lock);
2623 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2624 spin_unlock(&cifs_tcp_ses_lock);
2625
2626 free_xid(xid);
2627 return ses;
2628
2629 get_ses_fail:
2630 sesInfoFree(ses);
2631 free_xid(xid);
2632 return ERR_PTR(rc);
2633 }
2634
2635 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2636 {
2637 if (tcon->tidStatus == CifsExiting)
2638 return 0;
2639 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2640 return 0;
2641 if (tcon->seal != volume_info->seal)
2642 return 0;
2643 #ifdef CONFIG_CIFS_SMB2
2644 if (tcon->snapshot_time != volume_info->snapshot_time)
2645 return 0;
2646 #endif /* CONFIG_CIFS_SMB2 */
2647 return 1;
2648 }
2649
2650 static struct cifs_tcon *
2651 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2652 {
2653 struct list_head *tmp;
2654 struct cifs_tcon *tcon;
2655
2656 spin_lock(&cifs_tcp_ses_lock);
2657 list_for_each(tmp, &ses->tcon_list) {
2658 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2659 if (!match_tcon(tcon, volume_info))
2660 continue;
2661 ++tcon->tc_count;
2662 spin_unlock(&cifs_tcp_ses_lock);
2663 return tcon;
2664 }
2665 spin_unlock(&cifs_tcp_ses_lock);
2666 return NULL;
2667 }
2668
2669 void
2670 cifs_put_tcon(struct cifs_tcon *tcon)
2671 {
2672 unsigned int xid;
2673 struct cifs_ses *ses = tcon->ses;
2674
2675 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2676 spin_lock(&cifs_tcp_ses_lock);
2677 if (--tcon->tc_count > 0) {
2678 spin_unlock(&cifs_tcp_ses_lock);
2679 return;
2680 }
2681
2682 list_del_init(&tcon->tcon_list);
2683 spin_unlock(&cifs_tcp_ses_lock);
2684
2685 xid = get_xid();
2686 if (ses->server->ops->tree_disconnect)
2687 ses->server->ops->tree_disconnect(xid, tcon);
2688 _free_xid(xid);
2689
2690 cifs_fscache_release_super_cookie(tcon);
2691 tconInfoFree(tcon);
2692 cifs_put_smb_ses(ses);
2693 }
2694
2695 static struct cifs_tcon *
2696 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2697 {
2698 int rc, xid;
2699 struct cifs_tcon *tcon;
2700
2701 tcon = cifs_find_tcon(ses, volume_info);
2702 if (tcon) {
2703 cifs_dbg(FYI, "Found match on UNC path\n");
2704 /* existing tcon already has a reference */
2705 cifs_put_smb_ses(ses);
2706 return tcon;
2707 }
2708
2709 if (!ses->server->ops->tree_connect) {
2710 rc = -ENOSYS;
2711 goto out_fail;
2712 }
2713
2714 tcon = tconInfoAlloc();
2715 if (tcon == NULL) {
2716 rc = -ENOMEM;
2717 goto out_fail;
2718 }
2719
2720 if (volume_info->snapshot_time) {
2721 #ifdef CONFIG_CIFS_SMB2
2722 if (ses->server->vals->protocol_id == 0) {
2723 cifs_dbg(VFS,
2724 "Use SMB2 or later for snapshot mount option\n");
2725 rc = -EOPNOTSUPP;
2726 goto out_fail;
2727 } else
2728 tcon->snapshot_time = volume_info->snapshot_time;
2729 #else
2730 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2731 rc = -EOPNOTSUPP;
2732 goto out_fail;
2733 #endif /* CONFIG_CIFS_SMB2 */
2734 }
2735
2736 tcon->ses = ses;
2737 if (volume_info->password) {
2738 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2739 if (!tcon->password) {
2740 rc = -ENOMEM;
2741 goto out_fail;
2742 }
2743 }
2744
2745 /*
2746 * BB Do we need to wrap session_mutex around this TCon call and Unix
2747 * SetFS as we do on SessSetup and reconnect?
2748 */
2749 xid = get_xid();
2750 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2751 volume_info->local_nls);
2752 free_xid(xid);
2753 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2754 if (rc)
2755 goto out_fail;
2756
2757 if (volume_info->nodfs) {
2758 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2759 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2760 }
2761 tcon->use_persistent = false;
2762 /* check if SMB2 or later, CIFS does not support persistent handles */
2763 if (volume_info->persistent) {
2764 if (ses->server->vals->protocol_id == 0) {
2765 cifs_dbg(VFS,
2766 "SMB3 or later required for persistent handles\n");
2767 rc = -EOPNOTSUPP;
2768 goto out_fail;
2769 #ifdef CONFIG_CIFS_SMB2
2770 } else if (ses->server->capabilities &
2771 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2772 tcon->use_persistent = true;
2773 else /* persistent handles requested but not supported */ {
2774 cifs_dbg(VFS,
2775 "Persistent handles not supported on share\n");
2776 rc = -EOPNOTSUPP;
2777 goto out_fail;
2778 #endif /* CONFIG_CIFS_SMB2 */
2779 }
2780 #ifdef CONFIG_CIFS_SMB2
2781 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2782 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2783 && (volume_info->nopersistent == false)) {
2784 cifs_dbg(FYI, "enabling persistent handles\n");
2785 tcon->use_persistent = true;
2786 #endif /* CONFIG_CIFS_SMB2 */
2787 } else if (volume_info->resilient) {
2788 if (ses->server->vals->protocol_id == 0) {
2789 cifs_dbg(VFS,
2790 "SMB2.1 or later required for resilient handles\n");
2791 rc = -EOPNOTSUPP;
2792 goto out_fail;
2793 }
2794 tcon->use_resilient = true;
2795 }
2796
2797 if (volume_info->seal) {
2798 if (ses->server->vals->protocol_id == 0) {
2799 cifs_dbg(VFS,
2800 "SMB3 or later required for encryption\n");
2801 rc = -EOPNOTSUPP;
2802 goto out_fail;
2803 #ifdef CONFIG_CIFS_SMB2
2804 } else if (tcon->ses->server->capabilities &
2805 SMB2_GLOBAL_CAP_ENCRYPTION)
2806 tcon->seal = true;
2807 else {
2808 cifs_dbg(VFS, "Encryption is not supported on share\n");
2809 rc = -EOPNOTSUPP;
2810 goto out_fail;
2811 #endif /* CONFIG_CIFS_SMB2 */
2812 }
2813 }
2814
2815 /*
2816 * We can have only one retry value for a connection to a share so for
2817 * resources mounted more than once to the same server share the last
2818 * value passed in for the retry flag is used.
2819 */
2820 tcon->retry = volume_info->retry;
2821 tcon->nocase = volume_info->nocase;
2822 tcon->local_lease = volume_info->local_lease;
2823 INIT_LIST_HEAD(&tcon->pending_opens);
2824
2825 spin_lock(&cifs_tcp_ses_lock);
2826 list_add(&tcon->tcon_list, &ses->tcon_list);
2827 spin_unlock(&cifs_tcp_ses_lock);
2828
2829 cifs_fscache_get_super_cookie(tcon);
2830
2831 return tcon;
2832
2833 out_fail:
2834 tconInfoFree(tcon);
2835 return ERR_PTR(rc);
2836 }
2837
2838 void
2839 cifs_put_tlink(struct tcon_link *tlink)
2840 {
2841 if (!tlink || IS_ERR(tlink))
2842 return;
2843
2844 if (!atomic_dec_and_test(&tlink->tl_count) ||
2845 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2846 tlink->tl_time = jiffies;
2847 return;
2848 }
2849
2850 if (!IS_ERR(tlink_tcon(tlink)))
2851 cifs_put_tcon(tlink_tcon(tlink));
2852 kfree(tlink);
2853 return;
2854 }
2855
2856 static inline struct tcon_link *
2857 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2858 {
2859 return cifs_sb->master_tlink;
2860 }
2861
2862 static int
2863 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2864 {
2865 struct cifs_sb_info *old = CIFS_SB(sb);
2866 struct cifs_sb_info *new = mnt_data->cifs_sb;
2867
2868 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2869 return 0;
2870
2871 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2872 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2873 return 0;
2874
2875 /*
2876 * We want to share sb only if we don't specify an r/wsize or
2877 * specified r/wsize is greater than or equal to existing one.
2878 */
2879 if (new->wsize && new->wsize < old->wsize)
2880 return 0;
2881
2882 if (new->rsize && new->rsize < old->rsize)
2883 return 0;
2884
2885 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2886 return 0;
2887
2888 if (old->mnt_file_mode != new->mnt_file_mode ||
2889 old->mnt_dir_mode != new->mnt_dir_mode)
2890 return 0;
2891
2892 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2893 return 0;
2894
2895 if (old->actimeo != new->actimeo)
2896 return 0;
2897
2898 return 1;
2899 }
2900
2901 static int
2902 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2903 {
2904 struct cifs_sb_info *old = CIFS_SB(sb);
2905 struct cifs_sb_info *new = mnt_data->cifs_sb;
2906
2907 if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
2908 if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
2909 return 0;
2910 /* The prepath should be null terminated strings */
2911 if (strcmp(new->prepath, old->prepath))
2912 return 0;
2913
2914 return 1;
2915 }
2916 return 0;
2917 }
2918
2919 int
2920 cifs_match_super(struct super_block *sb, void *data)
2921 {
2922 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2923 struct smb_vol *volume_info;
2924 struct cifs_sb_info *cifs_sb;
2925 struct TCP_Server_Info *tcp_srv;
2926 struct cifs_ses *ses;
2927 struct cifs_tcon *tcon;
2928 struct tcon_link *tlink;
2929 int rc = 0;
2930
2931 spin_lock(&cifs_tcp_ses_lock);
2932 cifs_sb = CIFS_SB(sb);
2933 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2934 if (IS_ERR(tlink)) {
2935 spin_unlock(&cifs_tcp_ses_lock);
2936 return rc;
2937 }
2938 tcon = tlink_tcon(tlink);
2939 ses = tcon->ses;
2940 tcp_srv = ses->server;
2941
2942 volume_info = mnt_data->vol;
2943
2944 if (!match_server(tcp_srv, volume_info) ||
2945 !match_session(ses, volume_info) ||
2946 !match_tcon(tcon, volume_info) ||
2947 !match_prepath(sb, mnt_data)) {
2948 rc = 0;
2949 goto out;
2950 }
2951
2952 rc = compare_mount_options(sb, mnt_data);
2953 out:
2954 spin_unlock(&cifs_tcp_ses_lock);
2955 cifs_put_tlink(tlink);
2956 return rc;
2957 }
2958
2959 int
2960 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2961 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2962 struct dfs_info3_param **referrals, int remap)
2963 {
2964 char *temp_unc;
2965 int rc = 0;
2966
2967 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2968 return -ENOSYS;
2969
2970 *num_referrals = 0;
2971 *referrals = NULL;
2972
2973 if (ses->ipc_tid == 0) {
2974 temp_unc = kmalloc(2 /* for slashes */ +
2975 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2976 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2977 if (temp_unc == NULL)
2978 return -ENOMEM;
2979 temp_unc[0] = '\\';
2980 temp_unc[1] = '\\';
2981 strcpy(temp_unc + 2, ses->serverName);
2982 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2983 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2984 nls_codepage);
2985 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2986 kfree(temp_unc);
2987 }
2988 if (rc == 0)
2989 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2990 referrals, num_referrals,
2991 nls_codepage, remap);
2992 /*
2993 * BB - map targetUNCs to dfs_info3 structures, here or in
2994 * ses->server->ops->get_dfs_refer.
2995 */
2996
2997 return rc;
2998 }
2999
3000 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3001 static struct lock_class_key cifs_key[2];
3002 static struct lock_class_key cifs_slock_key[2];
3003
3004 static inline void
3005 cifs_reclassify_socket4(struct socket *sock)
3006 {
3007 struct sock *sk = sock->sk;
3008 BUG_ON(!sock_allow_reclassification(sk));
3009 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3010 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3011 }
3012
3013 static inline void
3014 cifs_reclassify_socket6(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_INET6-CIFS",
3019 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3020 }
3021 #else
3022 static inline void
3023 cifs_reclassify_socket4(struct socket *sock)
3024 {
3025 }
3026
3027 static inline void
3028 cifs_reclassify_socket6(struct socket *sock)
3029 {
3030 }
3031 #endif
3032
3033 /* See RFC1001 section 14 on representation of Netbios names */
3034 static void rfc1002mangle(char *target, char *source, unsigned int length)
3035 {
3036 unsigned int i, j;
3037
3038 for (i = 0, j = 0; i < (length); i++) {
3039 /* mask a nibble at a time and encode */
3040 target[j] = 'A' + (0x0F & (source[i] >> 4));
3041 target[j+1] = 'A' + (0x0F & source[i]);
3042 j += 2;
3043 }
3044
3045 }
3046
3047 static int
3048 bind_socket(struct TCP_Server_Info *server)
3049 {
3050 int rc = 0;
3051 if (server->srcaddr.ss_family != AF_UNSPEC) {
3052 /* Bind to the specified local IP address */
3053 struct socket *socket = server->ssocket;
3054 rc = socket->ops->bind(socket,
3055 (struct sockaddr *) &server->srcaddr,
3056 sizeof(server->srcaddr));
3057 if (rc < 0) {
3058 struct sockaddr_in *saddr4;
3059 struct sockaddr_in6 *saddr6;
3060 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3061 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3062 if (saddr6->sin6_family == AF_INET6)
3063 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3064 &saddr6->sin6_addr, rc);
3065 else
3066 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3067 &saddr4->sin_addr.s_addr, rc);
3068 }
3069 }
3070 return rc;
3071 }
3072
3073 static int
3074 ip_rfc1001_connect(struct TCP_Server_Info *server)
3075 {
3076 int rc = 0;
3077 /*
3078 * some servers require RFC1001 sessinit before sending
3079 * negprot - BB check reconnection in case where second
3080 * sessinit is sent but no second negprot
3081 */
3082 struct rfc1002_session_packet *ses_init_buf;
3083 struct smb_hdr *smb_buf;
3084 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3085 GFP_KERNEL);
3086 if (ses_init_buf) {
3087 ses_init_buf->trailer.session_req.called_len = 32;
3088
3089 if (server->server_RFC1001_name[0] != 0)
3090 rfc1002mangle(ses_init_buf->trailer.
3091 session_req.called_name,
3092 server->server_RFC1001_name,
3093 RFC1001_NAME_LEN_WITH_NULL);
3094 else
3095 rfc1002mangle(ses_init_buf->trailer.
3096 session_req.called_name,
3097 DEFAULT_CIFS_CALLED_NAME,
3098 RFC1001_NAME_LEN_WITH_NULL);
3099
3100 ses_init_buf->trailer.session_req.calling_len = 32;
3101
3102 /*
3103 * calling name ends in null (byte 16) from old smb
3104 * convention.
3105 */
3106 if (server->workstation_RFC1001_name[0] != 0)
3107 rfc1002mangle(ses_init_buf->trailer.
3108 session_req.calling_name,
3109 server->workstation_RFC1001_name,
3110 RFC1001_NAME_LEN_WITH_NULL);
3111 else
3112 rfc1002mangle(ses_init_buf->trailer.
3113 session_req.calling_name,
3114 "LINUX_CIFS_CLNT",
3115 RFC1001_NAME_LEN_WITH_NULL);
3116
3117 ses_init_buf->trailer.session_req.scope1 = 0;
3118 ses_init_buf->trailer.session_req.scope2 = 0;
3119 smb_buf = (struct smb_hdr *)ses_init_buf;
3120
3121 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3122 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3123 rc = smb_send(server, smb_buf, 0x44);
3124 kfree(ses_init_buf);
3125 /*
3126 * RFC1001 layer in at least one server
3127 * requires very short break before negprot
3128 * presumably because not expecting negprot
3129 * to follow so fast. This is a simple
3130 * solution that works without
3131 * complicating the code and causes no
3132 * significant slowing down on mount
3133 * for everyone else
3134 */
3135 usleep_range(1000, 2000);
3136 }
3137 /*
3138 * else the negprot may still work without this
3139 * even though malloc failed
3140 */
3141
3142 return rc;
3143 }
3144
3145 static int
3146 generic_ip_connect(struct TCP_Server_Info *server)
3147 {
3148 int rc = 0;
3149 __be16 sport;
3150 int slen, sfamily;
3151 struct socket *socket = server->ssocket;
3152 struct sockaddr *saddr;
3153
3154 saddr = (struct sockaddr *) &server->dstaddr;
3155
3156 if (server->dstaddr.ss_family == AF_INET6) {
3157 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3158 slen = sizeof(struct sockaddr_in6);
3159 sfamily = AF_INET6;
3160 } else {
3161 sport = ((struct sockaddr_in *) saddr)->sin_port;
3162 slen = sizeof(struct sockaddr_in);
3163 sfamily = AF_INET;
3164 }
3165
3166 if (socket == NULL) {
3167 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3168 IPPROTO_TCP, &socket, 1);
3169 if (rc < 0) {
3170 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3171 server->ssocket = NULL;
3172 return rc;
3173 }
3174
3175 /* BB other socket options to set KEEPALIVE, NODELAY? */
3176 cifs_dbg(FYI, "Socket created\n");
3177 server->ssocket = socket;
3178 socket->sk->sk_allocation = GFP_NOFS;
3179 if (sfamily == AF_INET6)
3180 cifs_reclassify_socket6(socket);
3181 else
3182 cifs_reclassify_socket4(socket);
3183 }
3184
3185 rc = bind_socket(server);
3186 if (rc < 0)
3187 return rc;
3188
3189 /*
3190 * Eventually check for other socket options to change from
3191 * the default. sock_setsockopt not used because it expects
3192 * user space buffer
3193 */
3194 socket->sk->sk_rcvtimeo = 7 * HZ;
3195 socket->sk->sk_sndtimeo = 5 * HZ;
3196
3197 /* make the bufsizes depend on wsize/rsize and max requests */
3198 if (server->noautotune) {
3199 if (socket->sk->sk_sndbuf < (200 * 1024))
3200 socket->sk->sk_sndbuf = 200 * 1024;
3201 if (socket->sk->sk_rcvbuf < (140 * 1024))
3202 socket->sk->sk_rcvbuf = 140 * 1024;
3203 }
3204
3205 if (server->tcp_nodelay) {
3206 int val = 1;
3207 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3208 (char *)&val, sizeof(val));
3209 if (rc)
3210 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3211 rc);
3212 }
3213
3214 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3215 socket->sk->sk_sndbuf,
3216 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3217
3218 rc = socket->ops->connect(socket, saddr, slen, 0);
3219 if (rc < 0) {
3220 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3221 sock_release(socket);
3222 server->ssocket = NULL;
3223 return rc;
3224 }
3225
3226 if (sport == htons(RFC1001_PORT))
3227 rc = ip_rfc1001_connect(server);
3228
3229 return rc;
3230 }
3231
3232 static int
3233 ip_connect(struct TCP_Server_Info *server)
3234 {
3235 __be16 *sport;
3236 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3237 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3238
3239 if (server->dstaddr.ss_family == AF_INET6)
3240 sport = &addr6->sin6_port;
3241 else
3242 sport = &addr->sin_port;
3243
3244 if (*sport == 0) {
3245 int rc;
3246
3247 /* try with 445 port at first */
3248 *sport = htons(CIFS_PORT);
3249
3250 rc = generic_ip_connect(server);
3251 if (rc >= 0)
3252 return rc;
3253
3254 /* if it failed, try with 139 port */
3255 *sport = htons(RFC1001_PORT);
3256 }
3257
3258 return generic_ip_connect(server);
3259 }
3260
3261 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3262 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3263 {
3264 /* if we are reconnecting then should we check to see if
3265 * any requested capabilities changed locally e.g. via
3266 * remount but we can not do much about it here
3267 * if they have (even if we could detect it by the following)
3268 * Perhaps we could add a backpointer to array of sb from tcon
3269 * or if we change to make all sb to same share the same
3270 * sb as NFS - then we only have one backpointer to sb.
3271 * What if we wanted to mount the server share twice once with
3272 * and once without posixacls or posix paths? */
3273 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3274
3275 if (vol_info && vol_info->no_linux_ext) {
3276 tcon->fsUnixInfo.Capability = 0;
3277 tcon->unix_ext = 0; /* Unix Extensions disabled */
3278 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3279 return;
3280 } else if (vol_info)
3281 tcon->unix_ext = 1; /* Unix Extensions supported */
3282
3283 if (tcon->unix_ext == 0) {
3284 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3285 return;
3286 }
3287
3288 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3289 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3290 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3291 /* check for reconnect case in which we do not
3292 want to change the mount behavior if we can avoid it */
3293 if (vol_info == NULL) {
3294 /* turn off POSIX ACL and PATHNAMES if not set
3295 originally at mount time */
3296 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3297 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3298 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3299 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3300 cifs_dbg(VFS, "POSIXPATH support change\n");
3301 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3302 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3303 cifs_dbg(VFS, "possible reconnect error\n");
3304 cifs_dbg(VFS, "server disabled POSIX path support\n");
3305 }
3306 }
3307
3308 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3309 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3310
3311 cap &= CIFS_UNIX_CAP_MASK;
3312 if (vol_info && vol_info->no_psx_acl)
3313 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3314 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3315 cifs_dbg(FYI, "negotiated posix acl support\n");
3316 if (cifs_sb)
3317 cifs_sb->mnt_cifs_flags |=
3318 CIFS_MOUNT_POSIXACL;
3319 }
3320
3321 if (vol_info && vol_info->posix_paths == 0)
3322 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3323 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3324 cifs_dbg(FYI, "negotiate posix pathnames\n");
3325 if (cifs_sb)
3326 cifs_sb->mnt_cifs_flags |=
3327 CIFS_MOUNT_POSIX_PATHS;
3328 }
3329
3330 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3331 #ifdef CONFIG_CIFS_DEBUG2
3332 if (cap & CIFS_UNIX_FCNTL_CAP)
3333 cifs_dbg(FYI, "FCNTL cap\n");
3334 if (cap & CIFS_UNIX_EXTATTR_CAP)
3335 cifs_dbg(FYI, "EXTATTR cap\n");
3336 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3337 cifs_dbg(FYI, "POSIX path cap\n");
3338 if (cap & CIFS_UNIX_XATTR_CAP)
3339 cifs_dbg(FYI, "XATTR cap\n");
3340 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3341 cifs_dbg(FYI, "POSIX ACL cap\n");
3342 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3343 cifs_dbg(FYI, "very large read cap\n");
3344 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3345 cifs_dbg(FYI, "very large write cap\n");
3346 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3347 cifs_dbg(FYI, "transport encryption cap\n");
3348 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3349 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3350 #endif /* CIFS_DEBUG2 */
3351 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3352 if (vol_info == NULL) {
3353 cifs_dbg(FYI, "resetting capabilities failed\n");
3354 } else
3355 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");
3356
3357 }
3358 }
3359 }
3360
3361 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3362 struct cifs_sb_info *cifs_sb)
3363 {
3364 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3365
3366 spin_lock_init(&cifs_sb->tlink_tree_lock);
3367 cifs_sb->tlink_tree = RB_ROOT;
3368
3369 /*
3370 * Temporarily set r/wsize for matching superblock. If we end up using
3371 * new sb then client will later negotiate it downward if needed.
3372 */
3373 cifs_sb->rsize = pvolume_info->rsize;
3374 cifs_sb->wsize = pvolume_info->wsize;
3375
3376 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3377 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3378 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3379 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3380 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3381 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3382
3383 cifs_sb->actimeo = pvolume_info->actimeo;
3384 cifs_sb->local_nls = pvolume_info->local_nls;
3385
3386 if (pvolume_info->noperm)
3387 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3388 if (pvolume_info->setuids)
3389 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3390 if (pvolume_info->setuidfromacl)
3391 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3392 if (pvolume_info->server_ino)
3393 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3394 if (pvolume_info->remap)
3395 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3396 if (pvolume_info->sfu_remap)
3397 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3398 if (pvolume_info->no_xattr)
3399 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3400 if (pvolume_info->sfu_emul)
3401 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3402 if (pvolume_info->nobrl)
3403 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3404 if (pvolume_info->nostrictsync)
3405 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3406 if (pvolume_info->mand_lock)
3407 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3408 if (pvolume_info->rwpidforward)
3409 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3410 if (pvolume_info->cifs_acl)
3411 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3412 if (pvolume_info->backupuid_specified) {
3413 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3414 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3415 }
3416 if (pvolume_info->backupgid_specified) {
3417 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3418 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3419 }
3420 if (pvolume_info->override_uid)
3421 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3422 if (pvolume_info->override_gid)
3423 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3424 if (pvolume_info->dynperm)
3425 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3426 if (pvolume_info->fsc)
3427 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3428 if (pvolume_info->multiuser)
3429 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3430 CIFS_MOUNT_NO_PERM);
3431 if (pvolume_info->strict_io)
3432 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3433 if (pvolume_info->direct_io) {
3434 cifs_dbg(FYI, "mounting share using direct i/o\n");
3435 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3436 }
3437 if (pvolume_info->mfsymlinks) {
3438 if (pvolume_info->sfu_emul) {
3439 /*
3440 * Our SFU ("Services for Unix" emulation does not allow
3441 * creating symlinks but does allow reading existing SFU
3442 * symlinks (it does allow both creating and reading SFU
3443 * style mknod and FIFOs though). When "mfsymlinks" and
3444 * "sfu" are both enabled at the same time, it allows
3445 * reading both types of symlinks, but will only create
3446 * them with mfsymlinks format. This allows better
3447 * Apple compatibility (probably better for Samba too)
3448 * while still recognizing old Windows style symlinks.
3449 */
3450 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3451 }
3452 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3453 }
3454
3455 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3456 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3457
3458 if (pvolume_info->prepath) {
3459 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3460 if (cifs_sb->prepath == NULL)
3461 return -ENOMEM;
3462 }
3463
3464 return 0;
3465 }
3466
3467 static void
3468 cleanup_volume_info_contents(struct smb_vol *volume_info)
3469 {
3470 kfree(volume_info->username);
3471 kzfree(volume_info->password);
3472 kfree(volume_info->UNC);
3473 kfree(volume_info->domainname);
3474 kfree(volume_info->iocharset);
3475 kfree(volume_info->prepath);
3476 }
3477
3478 void
3479 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3480 {
3481 if (!volume_info)
3482 return;
3483 cleanup_volume_info_contents(volume_info);
3484 kfree(volume_info);
3485 }
3486
3487
3488 #ifdef CONFIG_CIFS_DFS_UPCALL
3489 /*
3490 * cifs_build_path_to_root returns full path to root when we do not have an
3491 * exiting connection (tcon)
3492 */
3493 static char *
3494 build_unc_path_to_root(const struct smb_vol *vol,
3495 const struct cifs_sb_info *cifs_sb)
3496 {
3497 char *full_path, *pos;
3498 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3499 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3500
3501 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3502 if (full_path == NULL)
3503 return ERR_PTR(-ENOMEM);
3504
3505 strncpy(full_path, vol->UNC, unc_len);
3506 pos = full_path + unc_len;
3507
3508 if (pplen) {
3509 *pos = CIFS_DIR_SEP(cifs_sb);
3510 strncpy(pos + 1, vol->prepath, pplen);
3511 pos += pplen;
3512 }
3513
3514 *pos = '\0'; /* add trailing null */
3515 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3516 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3517 return full_path;
3518 }
3519
3520 /*
3521 * Perform a dfs referral query for a share and (optionally) prefix
3522 *
3523 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3524 * to a string containing updated options for the submount. Otherwise it
3525 * will be left untouched.
3526 *
3527 * Returns the rc from get_dfs_path to the caller, which can be used to
3528 * determine whether there were referrals.
3529 */
3530 static int
3531 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3532 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3533 int check_prefix)
3534 {
3535 int rc;
3536 unsigned int num_referrals = 0;
3537 struct dfs_info3_param *referrals = NULL;
3538 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3539
3540 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3541 if (IS_ERR(full_path))
3542 return PTR_ERR(full_path);
3543
3544 /* For DFS paths, skip the first '\' of the UNC */
3545 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3546
3547 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3548 &num_referrals, &referrals, cifs_remap(cifs_sb));
3549
3550 if (!rc && num_referrals > 0) {
3551 char *fake_devname = NULL;
3552
3553 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3554 full_path + 1, referrals,
3555 &fake_devname);
3556
3557 free_dfs_info_array(referrals, num_referrals);
3558
3559 if (IS_ERR(mdata)) {
3560 rc = PTR_ERR(mdata);
3561 mdata = NULL;
3562 } else {
3563 cleanup_volume_info_contents(volume_info);
3564 rc = cifs_setup_volume_info(volume_info, mdata,
3565 fake_devname);
3566 }
3567 kfree(fake_devname);
3568 kfree(cifs_sb->mountdata);
3569 cifs_sb->mountdata = mdata;
3570 }
3571 kfree(full_path);
3572 return rc;
3573 }
3574 #endif
3575
3576 static int
3577 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3578 const char *devname)
3579 {
3580 int rc = 0;
3581
3582 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3583 return -EINVAL;
3584
3585 if (volume_info->nullauth) {
3586 cifs_dbg(FYI, "Anonymous login\n");
3587 kfree(volume_info->username);
3588 volume_info->username = NULL;
3589 } else if (volume_info->username) {
3590 /* BB fixme parse for domain name here */
3591 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3592 } else {
3593 cifs_dbg(VFS, "No username specified\n");
3594 /* In userspace mount helper we can get user name from alternate
3595 locations such as env variables and files on disk */
3596 return -EINVAL;
3597 }
3598
3599 /* this is needed for ASCII cp to Unicode converts */
3600 if (volume_info->iocharset == NULL) {
3601 /* load_nls_default cannot return null */
3602 volume_info->local_nls = load_nls_default();
3603 } else {
3604 volume_info->local_nls = load_nls(volume_info->iocharset);
3605 if (volume_info->local_nls == NULL) {
3606 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3607 volume_info->iocharset);
3608 return -ELIBACC;
3609 }
3610 }
3611
3612 return rc;
3613 }
3614
3615 struct smb_vol *
3616 cifs_get_volume_info(char *mount_data, const char *devname)
3617 {
3618 int rc;
3619 struct smb_vol *volume_info;
3620
3621 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3622 if (!volume_info)
3623 return ERR_PTR(-ENOMEM);
3624
3625 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3626 if (rc) {
3627 cifs_cleanup_volume_info(volume_info);
3628 volume_info = ERR_PTR(rc);
3629 }
3630
3631 return volume_info;
3632 }
3633
3634 static int
3635 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3636 unsigned int xid,
3637 struct cifs_tcon *tcon,
3638 struct cifs_sb_info *cifs_sb,
3639 char *full_path)
3640 {
3641 int rc;
3642 char *s;
3643 char sep, tmp;
3644
3645 sep = CIFS_DIR_SEP(cifs_sb);
3646 s = full_path;
3647
3648 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3649 while (rc == 0) {
3650 /* skip separators */
3651 while (*s == sep)
3652 s++;
3653 if (!*s)
3654 break;
3655 /* next separator */
3656 while (*s && *s != sep)
3657 s++;
3658
3659 /*
3660 * temporarily null-terminate the path at the end of
3661 * the current component
3662 */
3663 tmp = *s;
3664 *s = 0;
3665 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3666 full_path);
3667 *s = tmp;
3668 }
3669 return rc;
3670 }
3671
3672 int
3673 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3674 {
3675 int rc;
3676 unsigned int xid;
3677 struct cifs_ses *ses;
3678 struct cifs_tcon *tcon;
3679 struct TCP_Server_Info *server;
3680 char *full_path;
3681 struct tcon_link *tlink;
3682 #ifdef CONFIG_CIFS_DFS_UPCALL
3683 int referral_walks_count = 0;
3684 #endif
3685
3686 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3687 if (rc)
3688 return rc;
3689
3690 #ifdef CONFIG_CIFS_DFS_UPCALL
3691 try_mount_again:
3692 /* cleanup activities if we're chasing a referral */
3693 if (referral_walks_count) {
3694 if (tcon)
3695 cifs_put_tcon(tcon);
3696 else if (ses)
3697 cifs_put_smb_ses(ses);
3698
3699 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3700
3701 free_xid(xid);
3702 }
3703 #endif
3704 rc = 0;
3705 tcon = NULL;
3706 ses = NULL;
3707 server = NULL;
3708 full_path = NULL;
3709 tlink = NULL;
3710
3711 xid = get_xid();
3712
3713 /* get a reference to a tcp session */
3714 server = cifs_get_tcp_session(volume_info);
3715 if (IS_ERR(server)) {
3716 rc = PTR_ERR(server);
3717 bdi_destroy(&cifs_sb->bdi);
3718 goto out;
3719 }
3720 if ((volume_info->max_credits < 20) ||
3721 (volume_info->max_credits > 60000))
3722 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3723 else
3724 server->max_credits = volume_info->max_credits;
3725 /* get a reference to a SMB session */
3726 ses = cifs_get_smb_ses(server, volume_info);
3727 if (IS_ERR(ses)) {
3728 rc = PTR_ERR(ses);
3729 ses = NULL;
3730 goto mount_fail_check;
3731 }
3732
3733 #ifdef CONFIG_CIFS_SMB2
3734 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3735 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3736 cifs_dbg(VFS, "persistent handles not supported by server\n");
3737 rc = -EOPNOTSUPP;
3738 goto mount_fail_check;
3739 }
3740 #endif /* CONFIG_CIFS_SMB2*/
3741
3742 /* search for existing tcon to this server share */
3743 tcon = cifs_get_tcon(ses, volume_info);
3744 if (IS_ERR(tcon)) {
3745 rc = PTR_ERR(tcon);
3746 tcon = NULL;
3747 goto remote_path_check;
3748 }
3749
3750 /* tell server which Unix caps we support */
3751 if (cap_unix(tcon->ses)) {
3752 /* reset of caps checks mount to see if unix extensions
3753 disabled for just this mount */
3754 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3755 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3756 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3757 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3758 rc = -EACCES;
3759 goto mount_fail_check;
3760 }
3761 } else
3762 tcon->unix_ext = 0; /* server does not support them */
3763
3764 /* do not care if a following call succeed - informational */
3765 if (!tcon->ipc && server->ops->qfs_tcon)
3766 server->ops->qfs_tcon(xid, tcon);
3767
3768 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3769 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3770
3771 /* tune readahead according to rsize */
3772 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_SIZE;
3773
3774 remote_path_check:
3775 #ifdef CONFIG_CIFS_DFS_UPCALL
3776 /*
3777 * Perform an unconditional check for whether there are DFS
3778 * referrals for this path without prefix, to provide support
3779 * for DFS referrals from w2k8 servers which don't seem to respond
3780 * with PATH_NOT_COVERED to requests that include the prefix.
3781 * Chase the referral if found, otherwise continue normally.
3782 */
3783 if (referral_walks_count == 0) {
3784 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3785 false);
3786 if (!refrc) {
3787 referral_walks_count++;
3788 goto try_mount_again;
3789 }
3790 }
3791 #endif
3792
3793 /* check if a whole path is not remote */
3794 if (!rc && tcon) {
3795 if (!server->ops->is_path_accessible) {
3796 rc = -ENOSYS;
3797 goto mount_fail_check;
3798 }
3799 /*
3800 * cifs_build_path_to_root works only when we have a valid tcon
3801 */
3802 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3803 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3804 if (full_path == NULL) {
3805 rc = -ENOMEM;
3806 goto mount_fail_check;
3807 }
3808 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3809 full_path);
3810 if (rc != 0 && rc != -EREMOTE) {
3811 kfree(full_path);
3812 goto mount_fail_check;
3813 }
3814
3815 if (rc != -EREMOTE) {
3816 rc = cifs_are_all_path_components_accessible(server,
3817 xid, tcon, cifs_sb,
3818 full_path);
3819 if (rc != 0) {
3820 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3821 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3822 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3823 rc = 0;
3824 }
3825 }
3826 kfree(full_path);
3827 }
3828
3829 /* get referral if needed */
3830 if (rc == -EREMOTE) {
3831 #ifdef CONFIG_CIFS_DFS_UPCALL
3832 if (referral_walks_count > MAX_NESTED_LINKS) {
3833 /*
3834 * BB: when we implement proper loop detection,
3835 * we will remove this check. But now we need it
3836 * to prevent an indefinite loop if 'DFS tree' is
3837 * misconfigured (i.e. has loops).
3838 */
3839 rc = -ELOOP;
3840 goto mount_fail_check;
3841 }
3842
3843 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3844
3845 if (!rc) {
3846 referral_walks_count++;
3847 goto try_mount_again;
3848 }
3849 goto mount_fail_check;
3850 #else /* No DFS support, return error on mount */
3851 rc = -EOPNOTSUPP;
3852 #endif
3853 }
3854
3855 if (rc)
3856 goto mount_fail_check;
3857
3858 /* now, hang the tcon off of the superblock */
3859 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3860 if (tlink == NULL) {
3861 rc = -ENOMEM;
3862 goto mount_fail_check;
3863 }
3864
3865 tlink->tl_uid = ses->linux_uid;
3866 tlink->tl_tcon = tcon;
3867 tlink->tl_time = jiffies;
3868 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3869 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3870
3871 cifs_sb->master_tlink = tlink;
3872 spin_lock(&cifs_sb->tlink_tree_lock);
3873 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3874 spin_unlock(&cifs_sb->tlink_tree_lock);
3875
3876 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3877 TLINK_IDLE_EXPIRE);
3878
3879 mount_fail_check:
3880 /* on error free sesinfo and tcon struct if needed */
3881 if (rc) {
3882 /* If find_unc succeeded then rc == 0 so we can not end */
3883 /* up accidentally freeing someone elses tcon struct */
3884 if (tcon)
3885 cifs_put_tcon(tcon);
3886 else if (ses)
3887 cifs_put_smb_ses(ses);
3888 else
3889 cifs_put_tcp_session(server, 0);
3890 bdi_destroy(&cifs_sb->bdi);
3891 }
3892
3893 out:
3894 free_xid(xid);
3895 return rc;
3896 }
3897
3898 /*
3899 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3900 * pointer may be NULL.
3901 */
3902 int
3903 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3904 const char *tree, struct cifs_tcon *tcon,
3905 const struct nls_table *nls_codepage)
3906 {
3907 struct smb_hdr *smb_buffer;
3908 struct smb_hdr *smb_buffer_response;
3909 TCONX_REQ *pSMB;
3910 TCONX_RSP *pSMBr;
3911 unsigned char *bcc_ptr;
3912 int rc = 0;
3913 int length;
3914 __u16 bytes_left, count;
3915
3916 if (ses == NULL)
3917 return -EIO;
3918
3919 smb_buffer = cifs_buf_get();
3920 if (smb_buffer == NULL)
3921 return -ENOMEM;
3922
3923 smb_buffer_response = smb_buffer;
3924
3925 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3926 NULL /*no tid */ , 4 /*wct */ );
3927
3928 smb_buffer->Mid = get_next_mid(ses->server);
3929 smb_buffer->Uid = ses->Suid;
3930 pSMB = (TCONX_REQ *) smb_buffer;
3931 pSMBr = (TCONX_RSP *) smb_buffer_response;
3932
3933 pSMB->AndXCommand = 0xFF;
3934 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3935 bcc_ptr = &pSMB->Password[0];
3936 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3937 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3938 *bcc_ptr = 0; /* password is null byte */
3939 bcc_ptr++; /* skip password */
3940 /* already aligned so no need to do it below */
3941 } else {
3942 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3943 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3944 specified as required (when that support is added to
3945 the vfs in the future) as only NTLM or the much
3946 weaker LANMAN (which we do not send by default) is accepted
3947 by Samba (not sure whether other servers allow
3948 NTLMv2 password here) */
3949 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3950 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3951 (ses->sectype == LANMAN))
3952 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3953 ses->server->sec_mode &
3954 SECMODE_PW_ENCRYPT ? true : false,
3955 bcc_ptr);
3956 else
3957 #endif /* CIFS_WEAK_PW_HASH */
3958 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3959 bcc_ptr, nls_codepage);
3960 if (rc) {
3961 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3962 __func__, rc);
3963 cifs_buf_release(smb_buffer);
3964 return rc;
3965 }
3966
3967 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3968 if (ses->capabilities & CAP_UNICODE) {
3969 /* must align unicode strings */
3970 *bcc_ptr = 0; /* null byte password */
3971 bcc_ptr++;
3972 }
3973 }
3974
3975 if (ses->server->sign)
3976 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3977
3978 if (ses->capabilities & CAP_STATUS32) {
3979 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3980 }
3981 if (ses->capabilities & CAP_DFS) {
3982 smb_buffer->Flags2 |= SMBFLG2_DFS;
3983 }
3984 if (ses->capabilities & CAP_UNICODE) {
3985 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3986 length =
3987 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3988 6 /* max utf8 char length in bytes */ *
3989 (/* server len*/ + 256 /* share len */), nls_codepage);
3990 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3991 bcc_ptr += 2; /* skip trailing null */
3992 } else { /* ASCII */
3993 strcpy(bcc_ptr, tree);
3994 bcc_ptr += strlen(tree) + 1;
3995 }
3996 strcpy(bcc_ptr, "?????");
3997 bcc_ptr += strlen("?????");
3998 bcc_ptr += 1;
3999 count = bcc_ptr - &pSMB->Password[0];
4000 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4001 pSMB->hdr.smb_buf_length) + count);
4002 pSMB->ByteCount = cpu_to_le16(count);
4003
4004 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4005 0);
4006
4007 /* above now done in SendReceive */
4008 if ((rc == 0) && (tcon != NULL)) {
4009 bool is_unicode;
4010
4011 tcon->tidStatus = CifsGood;
4012 tcon->need_reconnect = false;
4013 tcon->tid = smb_buffer_response->Tid;
4014 bcc_ptr = pByteArea(smb_buffer_response);
4015 bytes_left = get_bcc(smb_buffer_response);
4016 length = strnlen(bcc_ptr, bytes_left - 2);
4017 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4018 is_unicode = true;
4019 else
4020 is_unicode = false;
4021
4022
4023 /* skip service field (NB: this field is always ASCII) */
4024 if (length == 3) {
4025 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4026 (bcc_ptr[2] == 'C')) {
4027 cifs_dbg(FYI, "IPC connection\n");
4028 tcon->ipc = 1;
4029 }
4030 } else if (length == 2) {
4031 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4032 /* the most common case */
4033 cifs_dbg(FYI, "disk share connection\n");
4034 }
4035 }
4036 bcc_ptr += length + 1;
4037 bytes_left -= (length + 1);
4038 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4039
4040 /* mostly informational -- no need to fail on error here */
4041 kfree(tcon->nativeFileSystem);
4042 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4043 bytes_left, is_unicode,
4044 nls_codepage);
4045
4046 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4047
4048 if ((smb_buffer_response->WordCount == 3) ||
4049 (smb_buffer_response->WordCount == 7))
4050 /* field is in same location */
4051 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4052 else
4053 tcon->Flags = 0;
4054 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4055 } else if ((rc == 0) && tcon == NULL) {
4056 /* all we need to save for IPC$ connection */
4057 ses->ipc_tid = smb_buffer_response->Tid;
4058 }
4059
4060 cifs_buf_release(smb_buffer);
4061 return rc;
4062 }
4063
4064 static void delayed_free(struct rcu_head *p)
4065 {
4066 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4067 unload_nls(sbi->local_nls);
4068 kfree(sbi);
4069 }
4070
4071 void
4072 cifs_umount(struct cifs_sb_info *cifs_sb)
4073 {
4074 struct rb_root *root = &cifs_sb->tlink_tree;
4075 struct rb_node *node;
4076 struct tcon_link *tlink;
4077
4078 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4079
4080 spin_lock(&cifs_sb->tlink_tree_lock);
4081 while ((node = rb_first(root))) {
4082 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4083 cifs_get_tlink(tlink);
4084 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4085 rb_erase(node, root);
4086
4087 spin_unlock(&cifs_sb->tlink_tree_lock);
4088 cifs_put_tlink(tlink);
4089 spin_lock(&cifs_sb->tlink_tree_lock);
4090 }
4091 spin_unlock(&cifs_sb->tlink_tree_lock);
4092
4093 bdi_destroy(&cifs_sb->bdi);
4094 kfree(cifs_sb->mountdata);
4095 kfree(cifs_sb->prepath);
4096 call_rcu(&cifs_sb->rcu, delayed_free);
4097 }
4098
4099 int
4100 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4101 {
4102 int rc = 0;
4103 struct TCP_Server_Info *server = ses->server;
4104
4105 if (!server->ops->need_neg || !server->ops->negotiate)
4106 return -ENOSYS;
4107
4108 /* only send once per connect */
4109 if (!server->ops->need_neg(server))
4110 return 0;
4111
4112 set_credits(server, 1);
4113
4114 rc = server->ops->negotiate(xid, ses);
4115 if (rc == 0) {
4116 spin_lock(&GlobalMid_Lock);
4117 if (server->tcpStatus == CifsNeedNegotiate)
4118 server->tcpStatus = CifsGood;
4119 else
4120 rc = -EHOSTDOWN;
4121 spin_unlock(&GlobalMid_Lock);
4122 }
4123
4124 return rc;
4125 }
4126
4127 int
4128 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4129 struct nls_table *nls_info)
4130 {
4131 int rc = -ENOSYS;
4132 struct TCP_Server_Info *server = ses->server;
4133
4134 ses->capabilities = server->capabilities;
4135 if (linuxExtEnabled == 0)
4136 ses->capabilities &= (~server->vals->cap_unix);
4137
4138 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4139 server->sec_mode, server->capabilities, server->timeAdj);
4140
4141 if (server->ops->sess_setup)
4142 rc = server->ops->sess_setup(xid, ses, nls_info);
4143
4144 if (rc)
4145 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4146
4147 return rc;
4148 }
4149
4150 static int
4151 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4152 {
4153 vol->sectype = ses->sectype;
4154
4155 /* krb5 is special, since we don't need username or pw */
4156 if (vol->sectype == Kerberos)
4157 return 0;
4158
4159 return cifs_set_cifscreds(vol, ses);
4160 }
4161
4162 static struct cifs_tcon *
4163 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4164 {
4165 int rc;
4166 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4167 struct cifs_ses *ses;
4168 struct cifs_tcon *tcon = NULL;
4169 struct smb_vol *vol_info;
4170
4171 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4172 if (vol_info == NULL)
4173 return ERR_PTR(-ENOMEM);
4174
4175 vol_info->local_nls = cifs_sb->local_nls;
4176 vol_info->linux_uid = fsuid;
4177 vol_info->cred_uid = fsuid;
4178 vol_info->UNC = master_tcon->treeName;
4179 vol_info->retry = master_tcon->retry;
4180 vol_info->nocase = master_tcon->nocase;
4181 vol_info->local_lease = master_tcon->local_lease;
4182 vol_info->no_linux_ext = !master_tcon->unix_ext;
4183 vol_info->sectype = master_tcon->ses->sectype;
4184 vol_info->sign = master_tcon->ses->sign;
4185
4186 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4187 if (rc) {
4188 tcon = ERR_PTR(rc);
4189 goto out;
4190 }
4191
4192 /* get a reference for the same TCP session */
4193 spin_lock(&cifs_tcp_ses_lock);
4194 ++master_tcon->ses->server->srv_count;
4195 spin_unlock(&cifs_tcp_ses_lock);
4196
4197 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4198 if (IS_ERR(ses)) {
4199 tcon = (struct cifs_tcon *)ses;
4200 cifs_put_tcp_session(master_tcon->ses->server, 0);
4201 goto out;
4202 }
4203
4204 tcon = cifs_get_tcon(ses, vol_info);
4205 if (IS_ERR(tcon)) {
4206 cifs_put_smb_ses(ses);
4207 goto out;
4208 }
4209
4210 if (cap_unix(ses))
4211 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4212 out:
4213 kfree(vol_info->username);
4214 kfree(vol_info->password);
4215 kfree(vol_info);
4216
4217 return tcon;
4218 }
4219
4220 struct cifs_tcon *
4221 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4222 {
4223 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4224 }
4225
4226 /* find and return a tlink with given uid */
4227 static struct tcon_link *
4228 tlink_rb_search(struct rb_root *root, kuid_t uid)
4229 {
4230 struct rb_node *node = root->rb_node;
4231 struct tcon_link *tlink;
4232
4233 while (node) {
4234 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4235
4236 if (uid_gt(tlink->tl_uid, uid))
4237 node = node->rb_left;
4238 else if (uid_lt(tlink->tl_uid, uid))
4239 node = node->rb_right;
4240 else
4241 return tlink;
4242 }
4243 return NULL;
4244 }
4245
4246 /* insert a tcon_link into the tree */
4247 static void
4248 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4249 {
4250 struct rb_node **new = &(root->rb_node), *parent = NULL;
4251 struct tcon_link *tlink;
4252
4253 while (*new) {
4254 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4255 parent = *new;
4256
4257 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4258 new = &((*new)->rb_left);
4259 else
4260 new = &((*new)->rb_right);
4261 }
4262
4263 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4264 rb_insert_color(&new_tlink->tl_rbnode, root);
4265 }
4266
4267 /*
4268 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4269 * current task.
4270 *
4271 * If the superblock doesn't refer to a multiuser mount, then just return
4272 * the master tcon for the mount.
4273 *
4274 * First, search the rbtree for an existing tcon for this fsuid. If one
4275 * exists, then check to see if it's pending construction. If it is then wait
4276 * for construction to complete. Once it's no longer pending, check to see if
4277 * it failed and either return an error or retry construction, depending on
4278 * the timeout.
4279 *
4280 * If one doesn't exist then insert a new tcon_link struct into the tree and
4281 * try to construct a new one.
4282 */
4283 struct tcon_link *
4284 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4285 {
4286 int ret;
4287 kuid_t fsuid = current_fsuid();
4288 struct tcon_link *tlink, *newtlink;
4289
4290 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4291 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4292
4293 spin_lock(&cifs_sb->tlink_tree_lock);
4294 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4295 if (tlink)
4296 cifs_get_tlink(tlink);
4297 spin_unlock(&cifs_sb->tlink_tree_lock);
4298
4299 if (tlink == NULL) {
4300 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4301 if (newtlink == NULL)
4302 return ERR_PTR(-ENOMEM);
4303 newtlink->tl_uid = fsuid;
4304 newtlink->tl_tcon = ERR_PTR(-EACCES);
4305 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4306 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4307 cifs_get_tlink(newtlink);
4308
4309 spin_lock(&cifs_sb->tlink_tree_lock);
4310 /* was one inserted after previous search? */
4311 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4312 if (tlink) {
4313 cifs_get_tlink(tlink);
4314 spin_unlock(&cifs_sb->tlink_tree_lock);
4315 kfree(newtlink);
4316 goto wait_for_construction;
4317 }
4318 tlink = newtlink;
4319 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4320 spin_unlock(&cifs_sb->tlink_tree_lock);
4321 } else {
4322 wait_for_construction:
4323 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4324 TASK_INTERRUPTIBLE);
4325 if (ret) {
4326 cifs_put_tlink(tlink);
4327 return ERR_PTR(-ERESTARTSYS);
4328 }
4329
4330 /* if it's good, return it */
4331 if (!IS_ERR(tlink->tl_tcon))
4332 return tlink;
4333
4334 /* return error if we tried this already recently */
4335 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4336 cifs_put_tlink(tlink);
4337 return ERR_PTR(-EACCES);
4338 }
4339
4340 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4341 goto wait_for_construction;
4342 }
4343
4344 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4345 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4346 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4347
4348 if (IS_ERR(tlink->tl_tcon)) {
4349 cifs_put_tlink(tlink);
4350 return ERR_PTR(-EACCES);
4351 }
4352
4353 return tlink;
4354 }
4355
4356 /*
4357 * periodic workqueue job that scans tcon_tree for a superblock and closes
4358 * out tcons.
4359 */
4360 static void
4361 cifs_prune_tlinks(struct work_struct *work)
4362 {
4363 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4364 prune_tlinks.work);
4365 struct rb_root *root = &cifs_sb->tlink_tree;
4366 struct rb_node *node = rb_first(root);
4367 struct rb_node *tmp;
4368 struct tcon_link *tlink;
4369
4370 /*
4371 * Because we drop the spinlock in the loop in order to put the tlink
4372 * it's not guarded against removal of links from the tree. The only
4373 * places that remove entries from the tree are this function and
4374 * umounts. Because this function is non-reentrant and is canceled
4375 * before umount can proceed, this is safe.
4376 */
4377 spin_lock(&cifs_sb->tlink_tree_lock);
4378 node = rb_first(root);
4379 while (node != NULL) {
4380 tmp = node;
4381 node = rb_next(tmp);
4382 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4383
4384 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4385 atomic_read(&tlink->tl_count) != 0 ||
4386 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4387 continue;
4388
4389 cifs_get_tlink(tlink);
4390 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4391 rb_erase(tmp, root);
4392
4393 spin_unlock(&cifs_sb->tlink_tree_lock);
4394 cifs_put_tlink(tlink);
4395 spin_lock(&cifs_sb->tlink_tree_lock);
4396 }
4397 spin_unlock(&cifs_sb->tlink_tree_lock);
4398
4399 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4400 TLINK_IDLE_EXPIRE);
4401 }
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