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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/uuid.h>
39 #include <linux/uaccess.h>
40 #include <asm/processor.h>
41 #include <linux/inet.h>
42 #include <linux/module.h>
43 #include <keys/user-type.h>
44 #include <net/ipv6.h>
45 #include <linux/parser.h>
46 #include <linux/bvec.h>
47
48 #include "cifspdu.h"
49 #include "cifsglob.h"
50 #include "cifsproto.h"
51 #include "cifs_unicode.h"
52 #include "cifs_debug.h"
53 #include "cifs_fs_sb.h"
54 #include "ntlmssp.h"
55 #include "nterr.h"
56 #include "rfc1002pdu.h"
57 #include "fscache.h"
58 #include "smb2proto.h"
59
60 #define CIFS_PORT 445
61 #define RFC1001_PORT 139
62
63 extern mempool_t *cifs_req_poolp;
64
65 /* FIXME: should these be tunable? */
66 #define TLINK_ERROR_EXPIRE (1 * HZ)
67 #define TLINK_IDLE_EXPIRE (600 * HZ)
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_user_xattr, Opt_nouser_xattr,
72 Opt_forceuid, Opt_noforceuid,
73 Opt_forcegid, Opt_noforcegid,
74 Opt_noblocksend, Opt_noautotune,
75 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
76 Opt_mapposix, Opt_nomapposix,
77 Opt_mapchars, Opt_nomapchars, Opt_sfu,
78 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
79 Opt_noposixpaths, Opt_nounix,
80 Opt_nocase,
81 Opt_brl, Opt_nobrl,
82 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
83 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
84 Opt_nohard, Opt_nosoft,
85 Opt_nointr, Opt_intr,
86 Opt_nostrictsync, Opt_strictsync,
87 Opt_serverino, Opt_noserverino,
88 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
89 Opt_acl, Opt_noacl, Opt_locallease,
90 Opt_sign, Opt_seal, Opt_noac,
91 Opt_fsc, Opt_mfsymlinks,
92 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
93 Opt_persistent, Opt_nopersistent,
94 Opt_resilient, Opt_noresilient,
95 Opt_domainauto,
96
97 /* Mount options which take numeric value */
98 Opt_backupuid, Opt_backupgid, Opt_uid,
99 Opt_cruid, Opt_gid, Opt_file_mode,
100 Opt_dirmode, Opt_port,
101 Opt_rsize, Opt_wsize, Opt_actimeo,
102 Opt_echo_interval, Opt_max_credits,
103 Opt_snapshot,
104
105 /* Mount options which take string value */
106 Opt_user, Opt_pass, Opt_ip,
107 Opt_domain, Opt_srcaddr, Opt_iocharset,
108 Opt_netbiosname, Opt_servern,
109 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
110
111 /* Mount options to be ignored */
112 Opt_ignore,
113
114 /* Options which could be blank */
115 Opt_blank_pass,
116 Opt_blank_user,
117 Opt_blank_ip,
118
119 Opt_err
120 };
121
122 static const match_table_t cifs_mount_option_tokens = {
123
124 { Opt_user_xattr, "user_xattr" },
125 { Opt_nouser_xattr, "nouser_xattr" },
126 { Opt_forceuid, "forceuid" },
127 { Opt_noforceuid, "noforceuid" },
128 { Opt_forcegid, "forcegid" },
129 { Opt_noforcegid, "noforcegid" },
130 { Opt_noblocksend, "noblocksend" },
131 { Opt_noautotune, "noautotune" },
132 { Opt_hard, "hard" },
133 { Opt_soft, "soft" },
134 { Opt_perm, "perm" },
135 { Opt_noperm, "noperm" },
136 { Opt_mapchars, "mapchars" }, /* SFU style */
137 { Opt_nomapchars, "nomapchars" },
138 { Opt_mapposix, "mapposix" }, /* SFM style */
139 { Opt_nomapposix, "nomapposix" },
140 { Opt_sfu, "sfu" },
141 { Opt_nosfu, "nosfu" },
142 { Opt_nodfs, "nodfs" },
143 { Opt_posixpaths, "posixpaths" },
144 { Opt_noposixpaths, "noposixpaths" },
145 { Opt_nounix, "nounix" },
146 { Opt_nounix, "nolinux" },
147 { Opt_nocase, "nocase" },
148 { Opt_nocase, "ignorecase" },
149 { Opt_brl, "brl" },
150 { Opt_nobrl, "nobrl" },
151 { Opt_nobrl, "nolock" },
152 { Opt_forcemandatorylock, "forcemandatorylock" },
153 { Opt_forcemandatorylock, "forcemand" },
154 { Opt_setuids, "setuids" },
155 { Opt_nosetuids, "nosetuids" },
156 { Opt_setuidfromacl, "idsfromsid" },
157 { Opt_dynperm, "dynperm" },
158 { Opt_nodynperm, "nodynperm" },
159 { Opt_nohard, "nohard" },
160 { Opt_nosoft, "nosoft" },
161 { Opt_nointr, "nointr" },
162 { Opt_intr, "intr" },
163 { Opt_nostrictsync, "nostrictsync" },
164 { Opt_strictsync, "strictsync" },
165 { Opt_serverino, "serverino" },
166 { Opt_noserverino, "noserverino" },
167 { Opt_rwpidforward, "rwpidforward" },
168 { Opt_cifsacl, "cifsacl" },
169 { Opt_nocifsacl, "nocifsacl" },
170 { Opt_acl, "acl" },
171 { Opt_noacl, "noacl" },
172 { Opt_locallease, "locallease" },
173 { Opt_sign, "sign" },
174 { Opt_seal, "seal" },
175 { Opt_noac, "noac" },
176 { Opt_fsc, "fsc" },
177 { Opt_mfsymlinks, "mfsymlinks" },
178 { Opt_multiuser, "multiuser" },
179 { Opt_sloppy, "sloppy" },
180 { Opt_nosharesock, "nosharesock" },
181 { Opt_persistent, "persistenthandles"},
182 { Opt_nopersistent, "nopersistenthandles"},
183 { Opt_resilient, "resilienthandles"},
184 { Opt_noresilient, "noresilienthandles"},
185 { Opt_domainauto, "domainauto"},
186
187 { Opt_backupuid, "backupuid=%s" },
188 { Opt_backupgid, "backupgid=%s" },
189 { Opt_uid, "uid=%s" },
190 { Opt_cruid, "cruid=%s" },
191 { Opt_gid, "gid=%s" },
192 { Opt_file_mode, "file_mode=%s" },
193 { Opt_dirmode, "dirmode=%s" },
194 { Opt_dirmode, "dir_mode=%s" },
195 { Opt_port, "port=%s" },
196 { Opt_rsize, "rsize=%s" },
197 { Opt_wsize, "wsize=%s" },
198 { Opt_actimeo, "actimeo=%s" },
199 { Opt_echo_interval, "echo_interval=%s" },
200 { Opt_max_credits, "max_credits=%s" },
201 { Opt_snapshot, "snapshot=%s" },
202
203 { Opt_blank_user, "user=" },
204 { Opt_blank_user, "username=" },
205 { Opt_user, "user=%s" },
206 { Opt_user, "username=%s" },
207 { Opt_blank_pass, "pass=" },
208 { Opt_blank_pass, "password=" },
209 { Opt_pass, "pass=%s" },
210 { Opt_pass, "password=%s" },
211 { Opt_blank_ip, "ip=" },
212 { Opt_blank_ip, "addr=" },
213 { Opt_ip, "ip=%s" },
214 { Opt_ip, "addr=%s" },
215 { Opt_ignore, "unc=%s" },
216 { Opt_ignore, "target=%s" },
217 { Opt_ignore, "path=%s" },
218 { Opt_domain, "dom=%s" },
219 { Opt_domain, "domain=%s" },
220 { Opt_domain, "workgroup=%s" },
221 { Opt_srcaddr, "srcaddr=%s" },
222 { Opt_ignore, "prefixpath=%s" },
223 { Opt_iocharset, "iocharset=%s" },
224 { Opt_netbiosname, "netbiosname=%s" },
225 { Opt_servern, "servern=%s" },
226 { Opt_ver, "ver=%s" },
227 { Opt_vers, "vers=%s" },
228 { Opt_sec, "sec=%s" },
229 { Opt_cache, "cache=%s" },
230
231 { Opt_ignore, "cred" },
232 { Opt_ignore, "credentials" },
233 { Opt_ignore, "cred=%s" },
234 { Opt_ignore, "credentials=%s" },
235 { Opt_ignore, "guest" },
236 { Opt_ignore, "rw" },
237 { Opt_ignore, "ro" },
238 { Opt_ignore, "suid" },
239 { Opt_ignore, "nosuid" },
240 { Opt_ignore, "exec" },
241 { Opt_ignore, "noexec" },
242 { Opt_ignore, "nodev" },
243 { Opt_ignore, "noauto" },
244 { Opt_ignore, "dev" },
245 { Opt_ignore, "mand" },
246 { Opt_ignore, "nomand" },
247 { Opt_ignore, "_netdev" },
248
249 { Opt_err, NULL }
250 };
251
252 enum {
253 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
254 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
255 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
256 Opt_sec_ntlmv2i, Opt_sec_lanman,
257 Opt_sec_none,
258
259 Opt_sec_err
260 };
261
262 static const match_table_t cifs_secflavor_tokens = {
263 { Opt_sec_krb5, "krb5" },
264 { Opt_sec_krb5i, "krb5i" },
265 { Opt_sec_krb5p, "krb5p" },
266 { Opt_sec_ntlmsspi, "ntlmsspi" },
267 { Opt_sec_ntlmssp, "ntlmssp" },
268 { Opt_ntlm, "ntlm" },
269 { Opt_sec_ntlmi, "ntlmi" },
270 { Opt_sec_ntlmv2, "nontlm" },
271 { Opt_sec_ntlmv2, "ntlmv2" },
272 { Opt_sec_ntlmv2i, "ntlmv2i" },
273 { Opt_sec_lanman, "lanman" },
274 { Opt_sec_none, "none" },
275
276 { Opt_sec_err, NULL }
277 };
278
279 /* cache flavors */
280 enum {
281 Opt_cache_loose,
282 Opt_cache_strict,
283 Opt_cache_none,
284 Opt_cache_err
285 };
286
287 static const match_table_t cifs_cacheflavor_tokens = {
288 { Opt_cache_loose, "loose" },
289 { Opt_cache_strict, "strict" },
290 { Opt_cache_none, "none" },
291 { Opt_cache_err, NULL }
292 };
293
294 static const match_table_t cifs_smb_version_tokens = {
295 { Smb_1, SMB1_VERSION_STRING },
296 { Smb_20, SMB20_VERSION_STRING},
297 { Smb_21, SMB21_VERSION_STRING },
298 { Smb_30, SMB30_VERSION_STRING },
299 { Smb_302, SMB302_VERSION_STRING },
300 #ifdef CONFIG_CIFS_SMB311
301 { Smb_311, SMB311_VERSION_STRING },
302 { Smb_311, ALT_SMB311_VERSION_STRING },
303 #endif /* SMB311 */
304 { Smb_3any, SMB3ANY_VERSION_STRING },
305 { Smb_default, SMBDEFAULT_VERSION_STRING },
306 { Smb_version_err, NULL }
307 };
308
309 static int ip_connect(struct TCP_Server_Info *server);
310 static int generic_ip_connect(struct TCP_Server_Info *server);
311 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
312 static void cifs_prune_tlinks(struct work_struct *work);
313 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
314 const char *devname);
315
316 /*
317 * cifs tcp session reconnection
318 *
319 * mark tcp session as reconnecting so temporarily locked
320 * mark all smb sessions as reconnecting for tcp session
321 * reconnect tcp session
322 * wake up waiters on reconnection? - (not needed currently)
323 */
324 int
325 cifs_reconnect(struct TCP_Server_Info *server)
326 {
327 int rc = 0;
328 struct list_head *tmp, *tmp2;
329 struct cifs_ses *ses;
330 struct cifs_tcon *tcon;
331 struct mid_q_entry *mid_entry;
332 struct list_head retry_list;
333
334 spin_lock(&GlobalMid_Lock);
335 if (server->tcpStatus == CifsExiting) {
336 /* the demux thread will exit normally
337 next time through the loop */
338 spin_unlock(&GlobalMid_Lock);
339 return rc;
340 } else
341 server->tcpStatus = CifsNeedReconnect;
342 spin_unlock(&GlobalMid_Lock);
343 server->maxBuf = 0;
344 server->max_read = 0;
345
346 cifs_dbg(FYI, "Reconnecting tcp session\n");
347
348 /* before reconnecting the tcp session, mark the smb session (uid)
349 and the tid bad so they are not used until reconnected */
350 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
351 __func__);
352 spin_lock(&cifs_tcp_ses_lock);
353 list_for_each(tmp, &server->smb_ses_list) {
354 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
355 ses->need_reconnect = true;
356 list_for_each(tmp2, &ses->tcon_list) {
357 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
358 tcon->need_reconnect = true;
359 }
360 if (ses->tcon_ipc)
361 ses->tcon_ipc->need_reconnect = true;
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 server->tcpStatus == CifsNeedNegotiate) &&
517 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
518 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
519 server->hostname, (2 * server->echo_interval) / HZ);
520 cifs_reconnect(server);
521 wake_up(&server->response_q);
522 return true;
523 }
524
525 return false;
526 }
527
528 static int
529 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
530 {
531 int length = 0;
532 int total_read;
533
534 smb_msg->msg_control = NULL;
535 smb_msg->msg_controllen = 0;
536
537 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
538 try_to_freeze();
539
540 if (server_unresponsive(server))
541 return -ECONNABORTED;
542
543 length = sock_recvmsg(server->ssocket, smb_msg, 0);
544
545 if (server->tcpStatus == CifsExiting)
546 return -ESHUTDOWN;
547
548 if (server->tcpStatus == CifsNeedReconnect) {
549 cifs_reconnect(server);
550 return -ECONNABORTED;
551 }
552
553 if (length == -ERESTARTSYS ||
554 length == -EAGAIN ||
555 length == -EINTR) {
556 /*
557 * Minimum sleep to prevent looping, allowing socket
558 * to clear and app threads to set tcpStatus
559 * CifsNeedReconnect if server hung.
560 */
561 usleep_range(1000, 2000);
562 length = 0;
563 continue;
564 }
565
566 if (length <= 0) {
567 cifs_dbg(FYI, "Received no data or error: %d\n", length);
568 cifs_reconnect(server);
569 return -ECONNABORTED;
570 }
571 }
572 return total_read;
573 }
574
575 int
576 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
577 unsigned int to_read)
578 {
579 struct msghdr smb_msg;
580 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
581 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
582
583 return cifs_readv_from_socket(server, &smb_msg);
584 }
585
586 int
587 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
588 unsigned int to_read)
589 {
590 struct msghdr smb_msg;
591 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
592 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
593 return cifs_readv_from_socket(server, &smb_msg);
594 }
595
596 static bool
597 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
598 {
599 /*
600 * The first byte big endian of the length field,
601 * is actually not part of the length but the type
602 * with the most common, zero, as regular data.
603 */
604 switch (type) {
605 case RFC1002_SESSION_MESSAGE:
606 /* Regular SMB response */
607 return true;
608 case RFC1002_SESSION_KEEP_ALIVE:
609 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
610 break;
611 case RFC1002_POSITIVE_SESSION_RESPONSE:
612 cifs_dbg(FYI, "RFC 1002 positive session response\n");
613 break;
614 case RFC1002_NEGATIVE_SESSION_RESPONSE:
615 /*
616 * We get this from Windows 98 instead of an error on
617 * SMB negprot response.
618 */
619 cifs_dbg(FYI, "RFC 1002 negative session response\n");
620 /* give server a second to clean up */
621 msleep(1000);
622 /*
623 * Always try 445 first on reconnect since we get NACK
624 * on some if we ever connected to port 139 (the NACK
625 * is since we do not begin with RFC1001 session
626 * initialize frame).
627 */
628 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
629 cifs_reconnect(server);
630 wake_up(&server->response_q);
631 break;
632 default:
633 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
634 cifs_reconnect(server);
635 }
636
637 return false;
638 }
639
640 void
641 dequeue_mid(struct mid_q_entry *mid, bool malformed)
642 {
643 #ifdef CONFIG_CIFS_STATS2
644 mid->when_received = jiffies;
645 #endif
646 spin_lock(&GlobalMid_Lock);
647 if (!malformed)
648 mid->mid_state = MID_RESPONSE_RECEIVED;
649 else
650 mid->mid_state = MID_RESPONSE_MALFORMED;
651 list_del_init(&mid->qhead);
652 spin_unlock(&GlobalMid_Lock);
653 }
654
655 static void
656 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
657 char *buf, int malformed)
658 {
659 if (server->ops->check_trans2 &&
660 server->ops->check_trans2(mid, server, buf, malformed))
661 return;
662 mid->resp_buf = buf;
663 mid->large_buf = server->large_buf;
664 /* Was previous buf put in mpx struct for multi-rsp? */
665 if (!mid->multiRsp) {
666 /* smb buffer will be freed by user thread */
667 if (server->large_buf)
668 server->bigbuf = NULL;
669 else
670 server->smallbuf = NULL;
671 }
672 dequeue_mid(mid, malformed);
673 }
674
675 static void clean_demultiplex_info(struct TCP_Server_Info *server)
676 {
677 int length;
678
679 /* take it off the list, if it's not already */
680 spin_lock(&cifs_tcp_ses_lock);
681 list_del_init(&server->tcp_ses_list);
682 spin_unlock(&cifs_tcp_ses_lock);
683
684 spin_lock(&GlobalMid_Lock);
685 server->tcpStatus = CifsExiting;
686 spin_unlock(&GlobalMid_Lock);
687 wake_up_all(&server->response_q);
688
689 /* check if we have blocked requests that need to free */
690 spin_lock(&server->req_lock);
691 if (server->credits <= 0)
692 server->credits = 1;
693 spin_unlock(&server->req_lock);
694 /*
695 * Although there should not be any requests blocked on this queue it
696 * can not hurt to be paranoid and try to wake up requests that may
697 * haven been blocked when more than 50 at time were on the wire to the
698 * same server - they now will see the session is in exit state and get
699 * out of SendReceive.
700 */
701 wake_up_all(&server->request_q);
702 /* give those requests time to exit */
703 msleep(125);
704
705 if (server->ssocket) {
706 sock_release(server->ssocket);
707 server->ssocket = NULL;
708 }
709
710 if (!list_empty(&server->pending_mid_q)) {
711 struct list_head dispose_list;
712 struct mid_q_entry *mid_entry;
713 struct list_head *tmp, *tmp2;
714
715 INIT_LIST_HEAD(&dispose_list);
716 spin_lock(&GlobalMid_Lock);
717 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
718 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
719 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
720 mid_entry->mid_state = MID_SHUTDOWN;
721 list_move(&mid_entry->qhead, &dispose_list);
722 }
723 spin_unlock(&GlobalMid_Lock);
724
725 /* now walk dispose list and issue callbacks */
726 list_for_each_safe(tmp, tmp2, &dispose_list) {
727 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
728 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
729 list_del_init(&mid_entry->qhead);
730 mid_entry->callback(mid_entry);
731 }
732 /* 1/8th of sec is more than enough time for them to exit */
733 msleep(125);
734 }
735
736 if (!list_empty(&server->pending_mid_q)) {
737 /*
738 * mpx threads have not exited yet give them at least the smb
739 * send timeout time for long ops.
740 *
741 * Due to delays on oplock break requests, we need to wait at
742 * least 45 seconds before giving up on a request getting a
743 * response and going ahead and killing cifsd.
744 */
745 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
746 msleep(46000);
747 /*
748 * If threads still have not exited they are probably never
749 * coming home not much else we can do but free the memory.
750 */
751 }
752
753 kfree(server->hostname);
754 kfree(server);
755
756 length = atomic_dec_return(&tcpSesAllocCount);
757 if (length > 0)
758 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
759 }
760
761 static int
762 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
763 {
764 int length;
765 char *buf = server->smallbuf;
766 unsigned int pdu_length = get_rfc1002_length(buf);
767
768 /* make sure this will fit in a large buffer */
769 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
770 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
771 cifs_reconnect(server);
772 wake_up(&server->response_q);
773 return -ECONNABORTED;
774 }
775
776 /* switch to large buffer if too big for a small one */
777 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
778 server->large_buf = true;
779 memcpy(server->bigbuf, buf, server->total_read);
780 buf = server->bigbuf;
781 }
782
783 /* now read the rest */
784 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
785 pdu_length - HEADER_SIZE(server) + 1 + 4);
786 if (length < 0)
787 return length;
788 server->total_read += length;
789
790 dump_smb(buf, server->total_read);
791
792 return cifs_handle_standard(server, mid);
793 }
794
795 int
796 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
797 {
798 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
799 int length;
800
801 /*
802 * We know that we received enough to get to the MID as we
803 * checked the pdu_length earlier. Now check to see
804 * if the rest of the header is OK. We borrow the length
805 * var for the rest of the loop to avoid a new stack var.
806 *
807 * 48 bytes is enough to display the header and a little bit
808 * into the payload for debugging purposes.
809 */
810 length = server->ops->check_message(buf, server->total_read, server);
811 if (length != 0)
812 cifs_dump_mem("Bad SMB: ", buf,
813 min_t(unsigned int, server->total_read, 48));
814
815 if (server->ops->is_session_expired &&
816 server->ops->is_session_expired(buf)) {
817 cifs_reconnect(server);
818 wake_up(&server->response_q);
819 return -1;
820 }
821
822 if (server->ops->is_status_pending &&
823 server->ops->is_status_pending(buf, server, length))
824 return -1;
825
826 if (!mid)
827 return length;
828
829 handle_mid(mid, server, buf, length);
830 return 0;
831 }
832
833 static int
834 cifs_demultiplex_thread(void *p)
835 {
836 int length;
837 struct TCP_Server_Info *server = p;
838 unsigned int pdu_length;
839 char *buf = NULL;
840 struct task_struct *task_to_wake = NULL;
841 struct mid_q_entry *mid_entry;
842
843 current->flags |= PF_MEMALLOC;
844 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
845
846 length = atomic_inc_return(&tcpSesAllocCount);
847 if (length > 1)
848 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
849
850 set_freezable();
851 while (server->tcpStatus != CifsExiting) {
852 if (try_to_freeze())
853 continue;
854
855 if (!allocate_buffers(server))
856 continue;
857
858 server->large_buf = false;
859 buf = server->smallbuf;
860 pdu_length = 4; /* enough to get RFC1001 header */
861
862 length = cifs_read_from_socket(server, buf, pdu_length);
863 if (length < 0)
864 continue;
865 server->total_read = length;
866
867 /*
868 * The right amount was read from socket - 4 bytes,
869 * so we can now interpret the length field.
870 */
871 pdu_length = get_rfc1002_length(buf);
872
873 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
874 if (!is_smb_response(server, buf[0]))
875 continue;
876
877 /* make sure we have enough to get to the MID */
878 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
879 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
880 pdu_length);
881 cifs_reconnect(server);
882 wake_up(&server->response_q);
883 continue;
884 }
885
886 /* read down to the MID */
887 length = cifs_read_from_socket(server, buf + 4,
888 HEADER_SIZE(server) - 1 - 4);
889 if (length < 0)
890 continue;
891 server->total_read += length;
892
893 if (server->ops->is_transform_hdr &&
894 server->ops->receive_transform &&
895 server->ops->is_transform_hdr(buf)) {
896 length = server->ops->receive_transform(server,
897 &mid_entry);
898 } else {
899 mid_entry = server->ops->find_mid(server, buf);
900
901 if (!mid_entry || !mid_entry->receive)
902 length = standard_receive3(server, mid_entry);
903 else
904 length = mid_entry->receive(server, mid_entry);
905 }
906
907 if (length < 0)
908 continue;
909
910 if (server->large_buf)
911 buf = server->bigbuf;
912
913 server->lstrp = jiffies;
914 if (mid_entry != NULL) {
915 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
916 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
917 server->ops->handle_cancelled_mid)
918 server->ops->handle_cancelled_mid(
919 mid_entry->resp_buf,
920 server);
921
922 if (!mid_entry->multiRsp || mid_entry->multiEnd)
923 mid_entry->callback(mid_entry);
924 } else if (server->ops->is_oplock_break &&
925 server->ops->is_oplock_break(buf, server)) {
926 cifs_dbg(FYI, "Received oplock break\n");
927 } else {
928 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
929 atomic_read(&midCount));
930 cifs_dump_mem("Received Data is: ", buf,
931 HEADER_SIZE(server));
932 #ifdef CONFIG_CIFS_DEBUG2
933 if (server->ops->dump_detail)
934 server->ops->dump_detail(buf);
935 cifs_dump_mids(server);
936 #endif /* CIFS_DEBUG2 */
937
938 }
939 } /* end while !EXITING */
940
941 /* buffer usually freed in free_mid - need to free it here on exit */
942 cifs_buf_release(server->bigbuf);
943 if (server->smallbuf) /* no sense logging a debug message if NULL */
944 cifs_small_buf_release(server->smallbuf);
945
946 task_to_wake = xchg(&server->tsk, NULL);
947 clean_demultiplex_info(server);
948
949 /* if server->tsk was NULL then wait for a signal before exiting */
950 if (!task_to_wake) {
951 set_current_state(TASK_INTERRUPTIBLE);
952 while (!signal_pending(current)) {
953 schedule();
954 set_current_state(TASK_INTERRUPTIBLE);
955 }
956 set_current_state(TASK_RUNNING);
957 }
958
959 module_put_and_exit(0);
960 }
961
962 /* extract the host portion of the UNC string */
963 static char *
964 extract_hostname(const char *unc)
965 {
966 const char *src;
967 char *dst, *delim;
968 unsigned int len;
969
970 /* skip double chars at beginning of string */
971 /* BB: check validity of these bytes? */
972 src = unc + 2;
973
974 /* delimiter between hostname and sharename is always '\\' now */
975 delim = strchr(src, '\\');
976 if (!delim)
977 return ERR_PTR(-EINVAL);
978
979 len = delim - src;
980 dst = kmalloc((len + 1), GFP_KERNEL);
981 if (dst == NULL)
982 return ERR_PTR(-ENOMEM);
983
984 memcpy(dst, src, len);
985 dst[len] = '\0';
986
987 return dst;
988 }
989
990 static int get_option_ul(substring_t args[], unsigned long *option)
991 {
992 int rc;
993 char *string;
994
995 string = match_strdup(args);
996 if (string == NULL)
997 return -ENOMEM;
998 rc = kstrtoul(string, 0, option);
999 kfree(string);
1000
1001 return rc;
1002 }
1003
1004 static int get_option_uid(substring_t args[], kuid_t *result)
1005 {
1006 unsigned long value;
1007 kuid_t uid;
1008 int rc;
1009
1010 rc = get_option_ul(args, &value);
1011 if (rc)
1012 return rc;
1013
1014 uid = make_kuid(current_user_ns(), value);
1015 if (!uid_valid(uid))
1016 return -EINVAL;
1017
1018 *result = uid;
1019 return 0;
1020 }
1021
1022 static int get_option_gid(substring_t args[], kgid_t *result)
1023 {
1024 unsigned long value;
1025 kgid_t gid;
1026 int rc;
1027
1028 rc = get_option_ul(args, &value);
1029 if (rc)
1030 return rc;
1031
1032 gid = make_kgid(current_user_ns(), value);
1033 if (!gid_valid(gid))
1034 return -EINVAL;
1035
1036 *result = gid;
1037 return 0;
1038 }
1039
1040 static int cifs_parse_security_flavors(char *value,
1041 struct smb_vol *vol)
1042 {
1043
1044 substring_t args[MAX_OPT_ARGS];
1045
1046 /*
1047 * With mount options, the last one should win. Reset any existing
1048 * settings back to default.
1049 */
1050 vol->sectype = Unspecified;
1051 vol->sign = false;
1052
1053 switch (match_token(value, cifs_secflavor_tokens, args)) {
1054 case Opt_sec_krb5p:
1055 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1056 return 1;
1057 case Opt_sec_krb5i:
1058 vol->sign = true;
1059 /* Fallthrough */
1060 case Opt_sec_krb5:
1061 vol->sectype = Kerberos;
1062 break;
1063 case Opt_sec_ntlmsspi:
1064 vol->sign = true;
1065 /* Fallthrough */
1066 case Opt_sec_ntlmssp:
1067 vol->sectype = RawNTLMSSP;
1068 break;
1069 case Opt_sec_ntlmi:
1070 vol->sign = true;
1071 /* Fallthrough */
1072 case Opt_ntlm:
1073 vol->sectype = NTLM;
1074 break;
1075 case Opt_sec_ntlmv2i:
1076 vol->sign = true;
1077 /* Fallthrough */
1078 case Opt_sec_ntlmv2:
1079 vol->sectype = NTLMv2;
1080 break;
1081 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1082 case Opt_sec_lanman:
1083 vol->sectype = LANMAN;
1084 break;
1085 #endif
1086 case Opt_sec_none:
1087 vol->nullauth = 1;
1088 break;
1089 default:
1090 cifs_dbg(VFS, "bad security option: %s\n", value);
1091 return 1;
1092 }
1093
1094 return 0;
1095 }
1096
1097 static int
1098 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1099 {
1100 substring_t args[MAX_OPT_ARGS];
1101
1102 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1103 case Opt_cache_loose:
1104 vol->direct_io = false;
1105 vol->strict_io = false;
1106 break;
1107 case Opt_cache_strict:
1108 vol->direct_io = false;
1109 vol->strict_io = true;
1110 break;
1111 case Opt_cache_none:
1112 vol->direct_io = true;
1113 vol->strict_io = false;
1114 break;
1115 default:
1116 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1117 return 1;
1118 }
1119 return 0;
1120 }
1121
1122 static int
1123 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1124 {
1125 substring_t args[MAX_OPT_ARGS];
1126
1127 switch (match_token(value, cifs_smb_version_tokens, args)) {
1128 case Smb_1:
1129 vol->ops = &smb1_operations;
1130 vol->vals = &smb1_values;
1131 break;
1132 case Smb_20:
1133 vol->ops = &smb20_operations;
1134 vol->vals = &smb20_values;
1135 break;
1136 case Smb_21:
1137 vol->ops = &smb21_operations;
1138 vol->vals = &smb21_values;
1139 break;
1140 case Smb_30:
1141 vol->ops = &smb30_operations;
1142 vol->vals = &smb30_values;
1143 break;
1144 case Smb_302:
1145 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1146 vol->vals = &smb302_values;
1147 break;
1148 #ifdef CONFIG_CIFS_SMB311
1149 case Smb_311:
1150 vol->ops = &smb311_operations;
1151 vol->vals = &smb311_values;
1152 break;
1153 #endif /* SMB311 */
1154 case Smb_3any:
1155 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1156 vol->vals = &smb3any_values;
1157 break;
1158 case Smb_default:
1159 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1160 vol->vals = &smbdefault_values;
1161 break;
1162 default:
1163 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1164 return 1;
1165 }
1166 return 0;
1167 }
1168
1169 /*
1170 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1171 * fields with the result. Returns 0 on success and an error otherwise.
1172 */
1173 static int
1174 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1175 {
1176 char *pos;
1177 const char *delims = "/\\";
1178 size_t len;
1179
1180 /* make sure we have a valid UNC double delimiter prefix */
1181 len = strspn(devname, delims);
1182 if (len != 2)
1183 return -EINVAL;
1184
1185 /* find delimiter between host and sharename */
1186 pos = strpbrk(devname + 2, delims);
1187 if (!pos)
1188 return -EINVAL;
1189
1190 /* skip past delimiter */
1191 ++pos;
1192
1193 /* now go until next delimiter or end of string */
1194 len = strcspn(pos, delims);
1195
1196 /* move "pos" up to delimiter or NULL */
1197 pos += len;
1198 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1199 if (!vol->UNC)
1200 return -ENOMEM;
1201
1202 convert_delimiter(vol->UNC, '\\');
1203
1204 /* skip any delimiter */
1205 if (*pos == '/' || *pos == '\\')
1206 pos++;
1207
1208 /* If pos is NULL then no prepath */
1209 if (!*pos)
1210 return 0;
1211
1212 vol->prepath = kstrdup(pos, GFP_KERNEL);
1213 if (!vol->prepath)
1214 return -ENOMEM;
1215
1216 return 0;
1217 }
1218
1219 static int
1220 cifs_parse_mount_options(const char *mountdata, const char *devname,
1221 struct smb_vol *vol)
1222 {
1223 char *data, *end;
1224 char *mountdata_copy = NULL, *options;
1225 unsigned int temp_len, i, j;
1226 char separator[2];
1227 short int override_uid = -1;
1228 short int override_gid = -1;
1229 bool uid_specified = false;
1230 bool gid_specified = false;
1231 bool sloppy = false;
1232 char *invalid = NULL;
1233 char *nodename = utsname()->nodename;
1234 char *string = NULL;
1235 char *tmp_end, *value;
1236 char delim;
1237 bool got_ip = false;
1238 bool got_version = false;
1239 unsigned short port = 0;
1240 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1241
1242 separator[0] = ',';
1243 separator[1] = 0;
1244 delim = separator[0];
1245
1246 /* ensure we always start with zeroed-out smb_vol */
1247 memset(vol, 0, sizeof(*vol));
1248
1249 /*
1250 * does not have to be perfect mapping since field is
1251 * informational, only used for servers that do not support
1252 * port 445 and it can be overridden at mount time
1253 */
1254 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1255 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1256 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1257
1258 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1259 /* null target name indicates to use *SMBSERVR default called name
1260 if we end up sending RFC1001 session initialize */
1261 vol->target_rfc1001_name[0] = 0;
1262 vol->cred_uid = current_uid();
1263 vol->linux_uid = current_uid();
1264 vol->linux_gid = current_gid();
1265
1266 /*
1267 * default to SFM style remapping of seven reserved characters
1268 * unless user overrides it or we negotiate CIFS POSIX where
1269 * it is unnecessary. Can not simultaneously use more than one mapping
1270 * since then readdir could list files that open could not open
1271 */
1272 vol->remap = true;
1273
1274 /* default to only allowing write access to owner of the mount */
1275 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1276
1277 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1278 /* default is always to request posix paths. */
1279 vol->posix_paths = 1;
1280 /* default to using server inode numbers where available */
1281 vol->server_ino = 1;
1282
1283 /* default is to use strict cifs caching semantics */
1284 vol->strict_io = true;
1285
1286 vol->actimeo = CIFS_DEF_ACTIMEO;
1287
1288 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1289 vol->ops = &smb30_operations;
1290 vol->vals = &smbdefault_values;
1291
1292 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1293
1294 if (!mountdata)
1295 goto cifs_parse_mount_err;
1296
1297 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1298 if (!mountdata_copy)
1299 goto cifs_parse_mount_err;
1300
1301 options = mountdata_copy;
1302 end = options + strlen(options);
1303
1304 if (strncmp(options, "sep=", 4) == 0) {
1305 if (options[4] != 0) {
1306 separator[0] = options[4];
1307 options += 5;
1308 } else {
1309 cifs_dbg(FYI, "Null separator not allowed\n");
1310 }
1311 }
1312 vol->backupuid_specified = false; /* no backup intent for a user */
1313 vol->backupgid_specified = false; /* no backup intent for a group */
1314
1315 switch (cifs_parse_devname(devname, vol)) {
1316 case 0:
1317 break;
1318 case -ENOMEM:
1319 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1320 goto cifs_parse_mount_err;
1321 case -EINVAL:
1322 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1323 goto cifs_parse_mount_err;
1324 default:
1325 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1326 goto cifs_parse_mount_err;
1327 }
1328
1329 while ((data = strsep(&options, separator)) != NULL) {
1330 substring_t args[MAX_OPT_ARGS];
1331 unsigned long option;
1332 int token;
1333
1334 if (!*data)
1335 continue;
1336
1337 token = match_token(data, cifs_mount_option_tokens, args);
1338
1339 switch (token) {
1340
1341 /* Ingnore the following */
1342 case Opt_ignore:
1343 break;
1344
1345 /* Boolean values */
1346 case Opt_user_xattr:
1347 vol->no_xattr = 0;
1348 break;
1349 case Opt_nouser_xattr:
1350 vol->no_xattr = 1;
1351 break;
1352 case Opt_forceuid:
1353 override_uid = 1;
1354 break;
1355 case Opt_noforceuid:
1356 override_uid = 0;
1357 break;
1358 case Opt_forcegid:
1359 override_gid = 1;
1360 break;
1361 case Opt_noforcegid:
1362 override_gid = 0;
1363 break;
1364 case Opt_noblocksend:
1365 vol->noblocksnd = 1;
1366 break;
1367 case Opt_noautotune:
1368 vol->noautotune = 1;
1369 break;
1370 case Opt_hard:
1371 vol->retry = 1;
1372 break;
1373 case Opt_soft:
1374 vol->retry = 0;
1375 break;
1376 case Opt_perm:
1377 vol->noperm = 0;
1378 break;
1379 case Opt_noperm:
1380 vol->noperm = 1;
1381 break;
1382 case Opt_mapchars:
1383 vol->sfu_remap = true;
1384 vol->remap = false; /* disable SFM mapping */
1385 break;
1386 case Opt_nomapchars:
1387 vol->sfu_remap = false;
1388 break;
1389 case Opt_mapposix:
1390 vol->remap = true;
1391 vol->sfu_remap = false; /* disable SFU mapping */
1392 break;
1393 case Opt_nomapposix:
1394 vol->remap = false;
1395 break;
1396 case Opt_sfu:
1397 vol->sfu_emul = 1;
1398 break;
1399 case Opt_nosfu:
1400 vol->sfu_emul = 0;
1401 break;
1402 case Opt_nodfs:
1403 vol->nodfs = 1;
1404 break;
1405 case Opt_posixpaths:
1406 vol->posix_paths = 1;
1407 break;
1408 case Opt_noposixpaths:
1409 vol->posix_paths = 0;
1410 break;
1411 case Opt_nounix:
1412 vol->no_linux_ext = 1;
1413 break;
1414 case Opt_nocase:
1415 vol->nocase = 1;
1416 break;
1417 case Opt_brl:
1418 vol->nobrl = 0;
1419 break;
1420 case Opt_nobrl:
1421 vol->nobrl = 1;
1422 /*
1423 * turn off mandatory locking in mode
1424 * if remote locking is turned off since the
1425 * local vfs will do advisory
1426 */
1427 if (vol->file_mode ==
1428 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1429 vol->file_mode = S_IALLUGO;
1430 break;
1431 case Opt_forcemandatorylock:
1432 vol->mand_lock = 1;
1433 break;
1434 case Opt_setuids:
1435 vol->setuids = 1;
1436 break;
1437 case Opt_nosetuids:
1438 vol->setuids = 0;
1439 break;
1440 case Opt_setuidfromacl:
1441 vol->setuidfromacl = 1;
1442 break;
1443 case Opt_dynperm:
1444 vol->dynperm = true;
1445 break;
1446 case Opt_nodynperm:
1447 vol->dynperm = false;
1448 break;
1449 case Opt_nohard:
1450 vol->retry = 0;
1451 break;
1452 case Opt_nosoft:
1453 vol->retry = 1;
1454 break;
1455 case Opt_nointr:
1456 vol->intr = 0;
1457 break;
1458 case Opt_intr:
1459 vol->intr = 1;
1460 break;
1461 case Opt_nostrictsync:
1462 vol->nostrictsync = 1;
1463 break;
1464 case Opt_strictsync:
1465 vol->nostrictsync = 0;
1466 break;
1467 case Opt_serverino:
1468 vol->server_ino = 1;
1469 break;
1470 case Opt_noserverino:
1471 vol->server_ino = 0;
1472 break;
1473 case Opt_rwpidforward:
1474 vol->rwpidforward = 1;
1475 break;
1476 case Opt_cifsacl:
1477 vol->cifs_acl = 1;
1478 break;
1479 case Opt_nocifsacl:
1480 vol->cifs_acl = 0;
1481 break;
1482 case Opt_acl:
1483 vol->no_psx_acl = 0;
1484 break;
1485 case Opt_noacl:
1486 vol->no_psx_acl = 1;
1487 break;
1488 case Opt_locallease:
1489 vol->local_lease = 1;
1490 break;
1491 case Opt_sign:
1492 vol->sign = true;
1493 break;
1494 case Opt_seal:
1495 /* we do not do the following in secFlags because seal
1496 * is a per tree connection (mount) not a per socket
1497 * or per-smb connection option in the protocol
1498 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1499 */
1500 vol->seal = 1;
1501 break;
1502 case Opt_noac:
1503 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1504 break;
1505 case Opt_fsc:
1506 #ifndef CONFIG_CIFS_FSCACHE
1507 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1508 goto cifs_parse_mount_err;
1509 #endif
1510 vol->fsc = true;
1511 break;
1512 case Opt_mfsymlinks:
1513 vol->mfsymlinks = true;
1514 break;
1515 case Opt_multiuser:
1516 vol->multiuser = true;
1517 break;
1518 case Opt_sloppy:
1519 sloppy = true;
1520 break;
1521 case Opt_nosharesock:
1522 vol->nosharesock = true;
1523 break;
1524 case Opt_nopersistent:
1525 vol->nopersistent = true;
1526 if (vol->persistent) {
1527 cifs_dbg(VFS,
1528 "persistenthandles mount options conflict\n");
1529 goto cifs_parse_mount_err;
1530 }
1531 break;
1532 case Opt_persistent:
1533 vol->persistent = true;
1534 if ((vol->nopersistent) || (vol->resilient)) {
1535 cifs_dbg(VFS,
1536 "persistenthandles mount options conflict\n");
1537 goto cifs_parse_mount_err;
1538 }
1539 break;
1540 case Opt_resilient:
1541 vol->resilient = true;
1542 if (vol->persistent) {
1543 cifs_dbg(VFS,
1544 "persistenthandles mount options conflict\n");
1545 goto cifs_parse_mount_err;
1546 }
1547 break;
1548 case Opt_noresilient:
1549 vol->resilient = false; /* already the default */
1550 break;
1551 case Opt_domainauto:
1552 vol->domainauto = true;
1553 break;
1554
1555 /* Numeric Values */
1556 case Opt_backupuid:
1557 if (get_option_uid(args, &vol->backupuid)) {
1558 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1559 __func__);
1560 goto cifs_parse_mount_err;
1561 }
1562 vol->backupuid_specified = true;
1563 break;
1564 case Opt_backupgid:
1565 if (get_option_gid(args, &vol->backupgid)) {
1566 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1567 __func__);
1568 goto cifs_parse_mount_err;
1569 }
1570 vol->backupgid_specified = true;
1571 break;
1572 case Opt_uid:
1573 if (get_option_uid(args, &vol->linux_uid)) {
1574 cifs_dbg(VFS, "%s: Invalid uid value\n",
1575 __func__);
1576 goto cifs_parse_mount_err;
1577 }
1578 uid_specified = true;
1579 break;
1580 case Opt_cruid:
1581 if (get_option_uid(args, &vol->cred_uid)) {
1582 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1583 __func__);
1584 goto cifs_parse_mount_err;
1585 }
1586 break;
1587 case Opt_gid:
1588 if (get_option_gid(args, &vol->linux_gid)) {
1589 cifs_dbg(VFS, "%s: Invalid gid value\n",
1590 __func__);
1591 goto cifs_parse_mount_err;
1592 }
1593 gid_specified = true;
1594 break;
1595 case Opt_file_mode:
1596 if (get_option_ul(args, &option)) {
1597 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1598 __func__);
1599 goto cifs_parse_mount_err;
1600 }
1601 vol->file_mode = option;
1602 break;
1603 case Opt_dirmode:
1604 if (get_option_ul(args, &option)) {
1605 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1606 __func__);
1607 goto cifs_parse_mount_err;
1608 }
1609 vol->dir_mode = option;
1610 break;
1611 case Opt_port:
1612 if (get_option_ul(args, &option) ||
1613 option > USHRT_MAX) {
1614 cifs_dbg(VFS, "%s: Invalid port value\n",
1615 __func__);
1616 goto cifs_parse_mount_err;
1617 }
1618 port = (unsigned short)option;
1619 break;
1620 case Opt_rsize:
1621 if (get_option_ul(args, &option)) {
1622 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1623 __func__);
1624 goto cifs_parse_mount_err;
1625 }
1626 vol->rsize = option;
1627 break;
1628 case Opt_wsize:
1629 if (get_option_ul(args, &option)) {
1630 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1631 __func__);
1632 goto cifs_parse_mount_err;
1633 }
1634 vol->wsize = option;
1635 break;
1636 case Opt_actimeo:
1637 if (get_option_ul(args, &option)) {
1638 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1639 __func__);
1640 goto cifs_parse_mount_err;
1641 }
1642 vol->actimeo = HZ * option;
1643 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1644 cifs_dbg(VFS, "attribute cache timeout too large\n");
1645 goto cifs_parse_mount_err;
1646 }
1647 break;
1648 case Opt_echo_interval:
1649 if (get_option_ul(args, &option)) {
1650 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1651 __func__);
1652 goto cifs_parse_mount_err;
1653 }
1654 vol->echo_interval = option;
1655 break;
1656 case Opt_snapshot:
1657 if (get_option_ul(args, &option)) {
1658 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1659 __func__);
1660 goto cifs_parse_mount_err;
1661 }
1662 vol->snapshot_time = option;
1663 break;
1664 case Opt_max_credits:
1665 if (get_option_ul(args, &option) || (option < 20) ||
1666 (option > 60000)) {
1667 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1668 __func__);
1669 goto cifs_parse_mount_err;
1670 }
1671 vol->max_credits = option;
1672 break;
1673
1674 /* String Arguments */
1675
1676 case Opt_blank_user:
1677 /* null user, ie. anonymous authentication */
1678 vol->nullauth = 1;
1679 vol->username = NULL;
1680 break;
1681 case Opt_user:
1682 string = match_strdup(args);
1683 if (string == NULL)
1684 goto out_nomem;
1685
1686 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1687 CIFS_MAX_USERNAME_LEN) {
1688 pr_warn("CIFS: username too long\n");
1689 goto cifs_parse_mount_err;
1690 }
1691
1692 kfree(vol->username);
1693 vol->username = kstrdup(string, GFP_KERNEL);
1694 if (!vol->username)
1695 goto cifs_parse_mount_err;
1696 break;
1697 case Opt_blank_pass:
1698 /* passwords have to be handled differently
1699 * to allow the character used for deliminator
1700 * to be passed within them
1701 */
1702
1703 /*
1704 * Check if this is a case where the password
1705 * starts with a delimiter
1706 */
1707 tmp_end = strchr(data, '=');
1708 tmp_end++;
1709 if (!(tmp_end < end && tmp_end[1] == delim)) {
1710 /* No it is not. Set the password to NULL */
1711 kzfree(vol->password);
1712 vol->password = NULL;
1713 break;
1714 }
1715 /* Yes it is. Drop down to Opt_pass below.*/
1716 case Opt_pass:
1717 /* Obtain the value string */
1718 value = strchr(data, '=');
1719 value++;
1720
1721 /* Set tmp_end to end of the string */
1722 tmp_end = (char *) value + strlen(value);
1723
1724 /* Check if following character is the deliminator
1725 * If yes, we have encountered a double deliminator
1726 * reset the NULL character to the deliminator
1727 */
1728 if (tmp_end < end && tmp_end[1] == delim) {
1729 tmp_end[0] = delim;
1730
1731 /* Keep iterating until we get to a single
1732 * deliminator OR the end
1733 */
1734 while ((tmp_end = strchr(tmp_end, delim))
1735 != NULL && (tmp_end[1] == delim)) {
1736 tmp_end = (char *) &tmp_end[2];
1737 }
1738
1739 /* Reset var options to point to next element */
1740 if (tmp_end) {
1741 tmp_end[0] = '\0';
1742 options = (char *) &tmp_end[1];
1743 } else
1744 /* Reached the end of the mount option
1745 * string */
1746 options = end;
1747 }
1748
1749 kzfree(vol->password);
1750 /* Now build new password string */
1751 temp_len = strlen(value);
1752 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1753 if (vol->password == NULL) {
1754 pr_warn("CIFS: no memory for password\n");
1755 goto cifs_parse_mount_err;
1756 }
1757
1758 for (i = 0, j = 0; i < temp_len; i++, j++) {
1759 vol->password[j] = value[i];
1760 if ((value[i] == delim) &&
1761 value[i+1] == delim)
1762 /* skip the second deliminator */
1763 i++;
1764 }
1765 vol->password[j] = '\0';
1766 break;
1767 case Opt_blank_ip:
1768 /* FIXME: should this be an error instead? */
1769 got_ip = false;
1770 break;
1771 case Opt_ip:
1772 string = match_strdup(args);
1773 if (string == NULL)
1774 goto out_nomem;
1775
1776 if (!cifs_convert_address(dstaddr, string,
1777 strlen(string))) {
1778 pr_err("CIFS: bad ip= option (%s).\n", string);
1779 goto cifs_parse_mount_err;
1780 }
1781 got_ip = true;
1782 break;
1783 case Opt_domain:
1784 string = match_strdup(args);
1785 if (string == NULL)
1786 goto out_nomem;
1787
1788 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1789 == CIFS_MAX_DOMAINNAME_LEN) {
1790 pr_warn("CIFS: domain name too long\n");
1791 goto cifs_parse_mount_err;
1792 }
1793
1794 kfree(vol->domainname);
1795 vol->domainname = kstrdup(string, GFP_KERNEL);
1796 if (!vol->domainname) {
1797 pr_warn("CIFS: no memory for domainname\n");
1798 goto cifs_parse_mount_err;
1799 }
1800 cifs_dbg(FYI, "Domain name set\n");
1801 break;
1802 case Opt_srcaddr:
1803 string = match_strdup(args);
1804 if (string == NULL)
1805 goto out_nomem;
1806
1807 if (!cifs_convert_address(
1808 (struct sockaddr *)&vol->srcaddr,
1809 string, strlen(string))) {
1810 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1811 string);
1812 goto cifs_parse_mount_err;
1813 }
1814 break;
1815 case Opt_iocharset:
1816 string = match_strdup(args);
1817 if (string == NULL)
1818 goto out_nomem;
1819
1820 if (strnlen(string, 1024) >= 65) {
1821 pr_warn("CIFS: iocharset name too long.\n");
1822 goto cifs_parse_mount_err;
1823 }
1824
1825 if (strncasecmp(string, "default", 7) != 0) {
1826 kfree(vol->iocharset);
1827 vol->iocharset = kstrdup(string,
1828 GFP_KERNEL);
1829 if (!vol->iocharset) {
1830 pr_warn("CIFS: no memory for charset\n");
1831 goto cifs_parse_mount_err;
1832 }
1833 }
1834 /* if iocharset not set then load_nls_default
1835 * is used by caller
1836 */
1837 cifs_dbg(FYI, "iocharset set to %s\n", string);
1838 break;
1839 case Opt_netbiosname:
1840 string = match_strdup(args);
1841 if (string == NULL)
1842 goto out_nomem;
1843
1844 memset(vol->source_rfc1001_name, 0x20,
1845 RFC1001_NAME_LEN);
1846 /*
1847 * FIXME: are there cases in which a comma can
1848 * be valid in workstation netbios name (and
1849 * need special handling)?
1850 */
1851 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1852 /* don't ucase netbiosname for user */
1853 if (string[i] == 0)
1854 break;
1855 vol->source_rfc1001_name[i] = string[i];
1856 }
1857 /* The string has 16th byte zero still from
1858 * set at top of the function
1859 */
1860 if (i == RFC1001_NAME_LEN && string[i] != 0)
1861 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1862 break;
1863 case Opt_servern:
1864 /* servernetbiosname specified override *SMBSERVER */
1865 string = match_strdup(args);
1866 if (string == NULL)
1867 goto out_nomem;
1868
1869 /* last byte, type, is 0x20 for servr type */
1870 memset(vol->target_rfc1001_name, 0x20,
1871 RFC1001_NAME_LEN_WITH_NULL);
1872
1873 /* BB are there cases in which a comma can be
1874 valid in this workstation netbios name
1875 (and need special handling)? */
1876
1877 /* user or mount helper must uppercase the
1878 netbios name */
1879 for (i = 0; i < 15; i++) {
1880 if (string[i] == 0)
1881 break;
1882 vol->target_rfc1001_name[i] = string[i];
1883 }
1884 /* The string has 16th byte zero still from
1885 set at top of the function */
1886 if (i == RFC1001_NAME_LEN && string[i] != 0)
1887 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1888 break;
1889 case Opt_ver:
1890 /* version of mount userspace tools, not dialect */
1891 string = match_strdup(args);
1892 if (string == NULL)
1893 goto out_nomem;
1894
1895 /* If interface changes in mount.cifs bump to new ver */
1896 if (strncasecmp(string, "1", 1) == 0) {
1897 if (strlen(string) > 1) {
1898 pr_warn("Bad mount helper ver=%s. Did "
1899 "you want SMB1 (CIFS) dialect "
1900 "and mean to type vers=1.0 "
1901 "instead?\n", string);
1902 goto cifs_parse_mount_err;
1903 }
1904 /* This is the default */
1905 break;
1906 }
1907 /* For all other value, error */
1908 pr_warn("CIFS: Invalid mount helper version specified\n");
1909 goto cifs_parse_mount_err;
1910 case Opt_vers:
1911 /* protocol version (dialect) */
1912 string = match_strdup(args);
1913 if (string == NULL)
1914 goto out_nomem;
1915
1916 if (cifs_parse_smb_version(string, vol) != 0)
1917 goto cifs_parse_mount_err;
1918 got_version = true;
1919 break;
1920 case Opt_sec:
1921 string = match_strdup(args);
1922 if (string == NULL)
1923 goto out_nomem;
1924
1925 if (cifs_parse_security_flavors(string, vol) != 0)
1926 goto cifs_parse_mount_err;
1927 break;
1928 case Opt_cache:
1929 string = match_strdup(args);
1930 if (string == NULL)
1931 goto out_nomem;
1932
1933 if (cifs_parse_cache_flavor(string, vol) != 0)
1934 goto cifs_parse_mount_err;
1935 break;
1936 default:
1937 /*
1938 * An option we don't recognize. Save it off for later
1939 * if we haven't already found one
1940 */
1941 if (!invalid)
1942 invalid = data;
1943 break;
1944 }
1945 /* Free up any allocated string */
1946 kfree(string);
1947 string = NULL;
1948 }
1949
1950 if (!sloppy && invalid) {
1951 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1952 goto cifs_parse_mount_err;
1953 }
1954
1955 #ifndef CONFIG_KEYS
1956 /* Muliuser mounts require CONFIG_KEYS support */
1957 if (vol->multiuser) {
1958 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1959 goto cifs_parse_mount_err;
1960 }
1961 #endif
1962 if (!vol->UNC) {
1963 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1964 goto cifs_parse_mount_err;
1965 }
1966
1967 /* make sure UNC has a share name */
1968 if (!strchr(vol->UNC + 3, '\\')) {
1969 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1970 goto cifs_parse_mount_err;
1971 }
1972
1973 if (!got_ip) {
1974 int len;
1975 const char *slash;
1976
1977 /* No ip= option specified? Try to get it from UNC */
1978 /* Use the address part of the UNC. */
1979 slash = strchr(&vol->UNC[2], '\\');
1980 len = slash - &vol->UNC[2];
1981 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
1982 pr_err("Unable to determine destination address.\n");
1983 goto cifs_parse_mount_err;
1984 }
1985 }
1986
1987 /* set the port that we got earlier */
1988 cifs_set_port(dstaddr, port);
1989
1990 if (uid_specified)
1991 vol->override_uid = override_uid;
1992 else if (override_uid == 1)
1993 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1994
1995 if (gid_specified)
1996 vol->override_gid = override_gid;
1997 else if (override_gid == 1)
1998 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1999
2000 if (got_version == false)
2001 pr_warn("No dialect specified on mount. Default has changed to "
2002 "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
2003 "(SMB1). To use the less secure SMB1 dialect to access "
2004 "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
2005 " on mount.\n");
2006
2007 kfree(mountdata_copy);
2008 return 0;
2009
2010 out_nomem:
2011 pr_warn("Could not allocate temporary buffer\n");
2012 cifs_parse_mount_err:
2013 kfree(string);
2014 kfree(mountdata_copy);
2015 return 1;
2016 }
2017
2018 /** Returns true if srcaddr isn't specified and rhs isn't
2019 * specified, or if srcaddr is specified and
2020 * matches the IP address of the rhs argument.
2021 */
2022 static bool
2023 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2024 {
2025 switch (srcaddr->sa_family) {
2026 case AF_UNSPEC:
2027 return (rhs->sa_family == AF_UNSPEC);
2028 case AF_INET: {
2029 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2030 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2031 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2032 }
2033 case AF_INET6: {
2034 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2035 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2036 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2037 }
2038 default:
2039 WARN_ON(1);
2040 return false; /* don't expect to be here */
2041 }
2042 }
2043
2044 /*
2045 * If no port is specified in addr structure, we try to match with 445 port
2046 * and if it fails - with 139 ports. It should be called only if address
2047 * families of server and addr are equal.
2048 */
2049 static bool
2050 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2051 {
2052 __be16 port, *sport;
2053
2054 switch (addr->sa_family) {
2055 case AF_INET:
2056 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2057 port = ((struct sockaddr_in *) addr)->sin_port;
2058 break;
2059 case AF_INET6:
2060 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2061 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2062 break;
2063 default:
2064 WARN_ON(1);
2065 return false;
2066 }
2067
2068 if (!port) {
2069 port = htons(CIFS_PORT);
2070 if (port == *sport)
2071 return true;
2072
2073 port = htons(RFC1001_PORT);
2074 }
2075
2076 return port == *sport;
2077 }
2078
2079 static bool
2080 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2081 struct sockaddr *srcaddr)
2082 {
2083 switch (addr->sa_family) {
2084 case AF_INET: {
2085 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2086 struct sockaddr_in *srv_addr4 =
2087 (struct sockaddr_in *)&server->dstaddr;
2088
2089 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2090 return false;
2091 break;
2092 }
2093 case AF_INET6: {
2094 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2095 struct sockaddr_in6 *srv_addr6 =
2096 (struct sockaddr_in6 *)&server->dstaddr;
2097
2098 if (!ipv6_addr_equal(&addr6->sin6_addr,
2099 &srv_addr6->sin6_addr))
2100 return false;
2101 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2102 return false;
2103 break;
2104 }
2105 default:
2106 WARN_ON(1);
2107 return false; /* don't expect to be here */
2108 }
2109
2110 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2111 return false;
2112
2113 return true;
2114 }
2115
2116 static bool
2117 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2118 {
2119 /*
2120 * The select_sectype function should either return the vol->sectype
2121 * that was specified, or "Unspecified" if that sectype was not
2122 * compatible with the given NEGOTIATE request.
2123 */
2124 if (server->ops->select_sectype(server, vol->sectype)
2125 == Unspecified)
2126 return false;
2127
2128 /*
2129 * Now check if signing mode is acceptable. No need to check
2130 * global_secflags at this point since if MUST_SIGN is set then
2131 * the server->sign had better be too.
2132 */
2133 if (vol->sign && !server->sign)
2134 return false;
2135
2136 return true;
2137 }
2138
2139 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2140 {
2141 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2142
2143 if (vol->nosharesock)
2144 return 0;
2145
2146 /* BB update this for smb3any and default case */
2147 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2148 return 0;
2149
2150 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2151 return 0;
2152
2153 if (!match_address(server, addr,
2154 (struct sockaddr *)&vol->srcaddr))
2155 return 0;
2156
2157 if (!match_port(server, addr))
2158 return 0;
2159
2160 if (!match_security(server, vol))
2161 return 0;
2162
2163 if (server->echo_interval != vol->echo_interval * HZ)
2164 return 0;
2165
2166 return 1;
2167 }
2168
2169 static struct TCP_Server_Info *
2170 cifs_find_tcp_session(struct smb_vol *vol)
2171 {
2172 struct TCP_Server_Info *server;
2173
2174 spin_lock(&cifs_tcp_ses_lock);
2175 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2176 if (!match_server(server, vol))
2177 continue;
2178
2179 ++server->srv_count;
2180 spin_unlock(&cifs_tcp_ses_lock);
2181 cifs_dbg(FYI, "Existing tcp session with server found\n");
2182 return server;
2183 }
2184 spin_unlock(&cifs_tcp_ses_lock);
2185 return NULL;
2186 }
2187
2188 void
2189 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2190 {
2191 struct task_struct *task;
2192
2193 spin_lock(&cifs_tcp_ses_lock);
2194 if (--server->srv_count > 0) {
2195 spin_unlock(&cifs_tcp_ses_lock);
2196 return;
2197 }
2198
2199 put_net(cifs_net_ns(server));
2200
2201 list_del_init(&server->tcp_ses_list);
2202 spin_unlock(&cifs_tcp_ses_lock);
2203
2204 cancel_delayed_work_sync(&server->echo);
2205
2206 if (from_reconnect)
2207 /*
2208 * Avoid deadlock here: reconnect work calls
2209 * cifs_put_tcp_session() at its end. Need to be sure
2210 * that reconnect work does nothing with server pointer after
2211 * that step.
2212 */
2213 cancel_delayed_work(&server->reconnect);
2214 else
2215 cancel_delayed_work_sync(&server->reconnect);
2216
2217 spin_lock(&GlobalMid_Lock);
2218 server->tcpStatus = CifsExiting;
2219 spin_unlock(&GlobalMid_Lock);
2220
2221 cifs_crypto_secmech_release(server);
2222 cifs_fscache_release_client_cookie(server);
2223
2224 kfree(server->session_key.response);
2225 server->session_key.response = NULL;
2226 server->session_key.len = 0;
2227
2228 task = xchg(&server->tsk, NULL);
2229 if (task)
2230 force_sig(SIGKILL, task);
2231 }
2232
2233 static struct TCP_Server_Info *
2234 cifs_get_tcp_session(struct smb_vol *volume_info)
2235 {
2236 struct TCP_Server_Info *tcp_ses = NULL;
2237 int rc;
2238
2239 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2240
2241 /* see if we already have a matching tcp_ses */
2242 tcp_ses = cifs_find_tcp_session(volume_info);
2243 if (tcp_ses)
2244 return tcp_ses;
2245
2246 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2247 if (!tcp_ses) {
2248 rc = -ENOMEM;
2249 goto out_err;
2250 }
2251
2252 tcp_ses->ops = volume_info->ops;
2253 tcp_ses->vals = volume_info->vals;
2254 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2255 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2256 if (IS_ERR(tcp_ses->hostname)) {
2257 rc = PTR_ERR(tcp_ses->hostname);
2258 goto out_err_crypto_release;
2259 }
2260
2261 tcp_ses->noblocksnd = volume_info->noblocksnd;
2262 tcp_ses->noautotune = volume_info->noautotune;
2263 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2264 tcp_ses->in_flight = 0;
2265 tcp_ses->credits = 1;
2266 init_waitqueue_head(&tcp_ses->response_q);
2267 init_waitqueue_head(&tcp_ses->request_q);
2268 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2269 mutex_init(&tcp_ses->srv_mutex);
2270 memcpy(tcp_ses->workstation_RFC1001_name,
2271 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2272 memcpy(tcp_ses->server_RFC1001_name,
2273 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2274 tcp_ses->session_estab = false;
2275 tcp_ses->sequence_number = 0;
2276 tcp_ses->lstrp = jiffies;
2277 spin_lock_init(&tcp_ses->req_lock);
2278 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2279 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2280 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2281 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2282 mutex_init(&tcp_ses->reconnect_mutex);
2283 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2284 sizeof(tcp_ses->srcaddr));
2285 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2286 sizeof(tcp_ses->dstaddr));
2287 generate_random_uuid(tcp_ses->client_guid);
2288 /*
2289 * at this point we are the only ones with the pointer
2290 * to the struct since the kernel thread not created yet
2291 * no need to spinlock this init of tcpStatus or srv_count
2292 */
2293 tcp_ses->tcpStatus = CifsNew;
2294 ++tcp_ses->srv_count;
2295
2296 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2297 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2298 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2299 else
2300 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2301
2302 rc = ip_connect(tcp_ses);
2303 if (rc < 0) {
2304 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2305 goto out_err_crypto_release;
2306 }
2307
2308 /*
2309 * since we're in a cifs function already, we know that
2310 * this will succeed. No need for try_module_get().
2311 */
2312 __module_get(THIS_MODULE);
2313 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2314 tcp_ses, "cifsd");
2315 if (IS_ERR(tcp_ses->tsk)) {
2316 rc = PTR_ERR(tcp_ses->tsk);
2317 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2318 module_put(THIS_MODULE);
2319 goto out_err_crypto_release;
2320 }
2321 tcp_ses->tcpStatus = CifsNeedNegotiate;
2322
2323 /* thread spawned, put it on the list */
2324 spin_lock(&cifs_tcp_ses_lock);
2325 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2326 spin_unlock(&cifs_tcp_ses_lock);
2327
2328 cifs_fscache_get_client_cookie(tcp_ses);
2329
2330 /* queue echo request delayed work */
2331 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2332
2333 return tcp_ses;
2334
2335 out_err_crypto_release:
2336 cifs_crypto_secmech_release(tcp_ses);
2337
2338 put_net(cifs_net_ns(tcp_ses));
2339
2340 out_err:
2341 if (tcp_ses) {
2342 if (!IS_ERR(tcp_ses->hostname))
2343 kfree(tcp_ses->hostname);
2344 if (tcp_ses->ssocket)
2345 sock_release(tcp_ses->ssocket);
2346 kfree(tcp_ses);
2347 }
2348 return ERR_PTR(rc);
2349 }
2350
2351 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2352 {
2353 if (vol->sectype != Unspecified &&
2354 vol->sectype != ses->sectype)
2355 return 0;
2356
2357 switch (ses->sectype) {
2358 case Kerberos:
2359 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2360 return 0;
2361 break;
2362 default:
2363 /* NULL username means anonymous session */
2364 if (ses->user_name == NULL) {
2365 if (!vol->nullauth)
2366 return 0;
2367 break;
2368 }
2369
2370 /* anything else takes username/password */
2371 if (strncmp(ses->user_name,
2372 vol->username ? vol->username : "",
2373 CIFS_MAX_USERNAME_LEN))
2374 return 0;
2375 if ((vol->username && strlen(vol->username) != 0) &&
2376 ses->password != NULL &&
2377 strncmp(ses->password,
2378 vol->password ? vol->password : "",
2379 CIFS_MAX_PASSWORD_LEN))
2380 return 0;
2381 }
2382 return 1;
2383 }
2384
2385 /**
2386 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2387 *
2388 * A new IPC connection is made and stored in the session
2389 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2390 */
2391 static int
2392 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2393 {
2394 int rc = 0, xid;
2395 struct cifs_tcon *tcon;
2396 struct nls_table *nls_codepage;
2397 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2398 bool seal = false;
2399
2400 /*
2401 * If the mount request that resulted in the creation of the
2402 * session requires encryption, force IPC to be encrypted too.
2403 */
2404 if (volume_info->seal) {
2405 if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2406 seal = true;
2407 else {
2408 cifs_dbg(VFS,
2409 "IPC: server doesn't support encryption\n");
2410 return -EOPNOTSUPP;
2411 }
2412 }
2413
2414 tcon = tconInfoAlloc();
2415 if (tcon == NULL)
2416 return -ENOMEM;
2417
2418 snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
2419
2420 /* cannot fail */
2421 nls_codepage = load_nls_default();
2422
2423 xid = get_xid();
2424 tcon->ses = ses;
2425 tcon->ipc = true;
2426 tcon->seal = seal;
2427 rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2428 free_xid(xid);
2429
2430 if (rc) {
2431 cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2432 tconInfoFree(tcon);
2433 goto out;
2434 }
2435
2436 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2437
2438 ses->tcon_ipc = tcon;
2439 out:
2440 unload_nls(nls_codepage);
2441 return rc;
2442 }
2443
2444 /**
2445 * cifs_free_ipc - helper to release the session IPC tcon
2446 *
2447 * Needs to be called everytime a session is destroyed
2448 */
2449 static int
2450 cifs_free_ipc(struct cifs_ses *ses)
2451 {
2452 int rc = 0, xid;
2453 struct cifs_tcon *tcon = ses->tcon_ipc;
2454
2455 if (tcon == NULL)
2456 return 0;
2457
2458 if (ses->server->ops->tree_disconnect) {
2459 xid = get_xid();
2460 rc = ses->server->ops->tree_disconnect(xid, tcon);
2461 free_xid(xid);
2462 }
2463
2464 if (rc)
2465 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2466
2467 tconInfoFree(tcon);
2468 ses->tcon_ipc = NULL;
2469 return rc;
2470 }
2471
2472 static struct cifs_ses *
2473 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2474 {
2475 struct cifs_ses *ses;
2476
2477 spin_lock(&cifs_tcp_ses_lock);
2478 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2479 if (ses->status == CifsExiting)
2480 continue;
2481 if (!match_session(ses, vol))
2482 continue;
2483 ++ses->ses_count;
2484 spin_unlock(&cifs_tcp_ses_lock);
2485 return ses;
2486 }
2487 spin_unlock(&cifs_tcp_ses_lock);
2488 return NULL;
2489 }
2490
2491 static void
2492 cifs_put_smb_ses(struct cifs_ses *ses)
2493 {
2494 unsigned int rc, xid;
2495 struct TCP_Server_Info *server = ses->server;
2496
2497 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2498
2499 spin_lock(&cifs_tcp_ses_lock);
2500 if (ses->status == CifsExiting) {
2501 spin_unlock(&cifs_tcp_ses_lock);
2502 return;
2503 }
2504 if (--ses->ses_count > 0) {
2505 spin_unlock(&cifs_tcp_ses_lock);
2506 return;
2507 }
2508 if (ses->status == CifsGood)
2509 ses->status = CifsExiting;
2510 spin_unlock(&cifs_tcp_ses_lock);
2511
2512 cifs_free_ipc(ses);
2513
2514 if (ses->status == CifsExiting && server->ops->logoff) {
2515 xid = get_xid();
2516 rc = server->ops->logoff(xid, ses);
2517 if (rc)
2518 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2519 __func__, rc);
2520 _free_xid(xid);
2521 }
2522
2523 spin_lock(&cifs_tcp_ses_lock);
2524 list_del_init(&ses->smb_ses_list);
2525 spin_unlock(&cifs_tcp_ses_lock);
2526
2527 sesInfoFree(ses);
2528 cifs_put_tcp_session(server, 0);
2529 }
2530
2531 #ifdef CONFIG_KEYS
2532
2533 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2534 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2535
2536 /* Populate username and pw fields from keyring if possible */
2537 static int
2538 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2539 {
2540 int rc = 0;
2541 const char *delim, *payload;
2542 char *desc;
2543 ssize_t len;
2544 struct key *key;
2545 struct TCP_Server_Info *server = ses->server;
2546 struct sockaddr_in *sa;
2547 struct sockaddr_in6 *sa6;
2548 const struct user_key_payload *upayload;
2549
2550 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2551 if (!desc)
2552 return -ENOMEM;
2553
2554 /* try to find an address key first */
2555 switch (server->dstaddr.ss_family) {
2556 case AF_INET:
2557 sa = (struct sockaddr_in *)&server->dstaddr;
2558 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2559 break;
2560 case AF_INET6:
2561 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2562 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2563 break;
2564 default:
2565 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2566 server->dstaddr.ss_family);
2567 rc = -EINVAL;
2568 goto out_err;
2569 }
2570
2571 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2572 key = request_key(&key_type_logon, desc, "");
2573 if (IS_ERR(key)) {
2574 if (!ses->domainName) {
2575 cifs_dbg(FYI, "domainName is NULL\n");
2576 rc = PTR_ERR(key);
2577 goto out_err;
2578 }
2579
2580 /* didn't work, try to find a domain key */
2581 sprintf(desc, "cifs:d:%s", ses->domainName);
2582 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2583 key = request_key(&key_type_logon, desc, "");
2584 if (IS_ERR(key)) {
2585 rc = PTR_ERR(key);
2586 goto out_err;
2587 }
2588 }
2589
2590 down_read(&key->sem);
2591 upayload = user_key_payload_locked(key);
2592 if (IS_ERR_OR_NULL(upayload)) {
2593 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2594 goto out_key_put;
2595 }
2596
2597 /* find first : in payload */
2598 payload = upayload->data;
2599 delim = strnchr(payload, upayload->datalen, ':');
2600 cifs_dbg(FYI, "payload=%s\n", payload);
2601 if (!delim) {
2602 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2603 upayload->datalen);
2604 rc = -EINVAL;
2605 goto out_key_put;
2606 }
2607
2608 len = delim - payload;
2609 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2610 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2611 len);
2612 rc = -EINVAL;
2613 goto out_key_put;
2614 }
2615
2616 vol->username = kstrndup(payload, len, GFP_KERNEL);
2617 if (!vol->username) {
2618 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2619 len);
2620 rc = -ENOMEM;
2621 goto out_key_put;
2622 }
2623 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2624
2625 len = key->datalen - (len + 1);
2626 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2627 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2628 rc = -EINVAL;
2629 kfree(vol->username);
2630 vol->username = NULL;
2631 goto out_key_put;
2632 }
2633
2634 ++delim;
2635 vol->password = kstrndup(delim, len, GFP_KERNEL);
2636 if (!vol->password) {
2637 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2638 len);
2639 rc = -ENOMEM;
2640 kfree(vol->username);
2641 vol->username = NULL;
2642 goto out_key_put;
2643 }
2644
2645 out_key_put:
2646 up_read(&key->sem);
2647 key_put(key);
2648 out_err:
2649 kfree(desc);
2650 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2651 return rc;
2652 }
2653 #else /* ! CONFIG_KEYS */
2654 static inline int
2655 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2656 struct cifs_ses *ses __attribute__((unused)))
2657 {
2658 return -ENOSYS;
2659 }
2660 #endif /* CONFIG_KEYS */
2661
2662 static struct cifs_ses *
2663 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2664 {
2665 int rc = -ENOMEM;
2666 unsigned int xid;
2667 struct cifs_ses *ses;
2668 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2669 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2670
2671 xid = get_xid();
2672
2673 ses = cifs_find_smb_ses(server, volume_info);
2674 if (ses) {
2675 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2676 ses->status);
2677
2678 mutex_lock(&ses->session_mutex);
2679 rc = cifs_negotiate_protocol(xid, ses);
2680 if (rc) {
2681 mutex_unlock(&ses->session_mutex);
2682 /* problem -- put our ses reference */
2683 cifs_put_smb_ses(ses);
2684 free_xid(xid);
2685 return ERR_PTR(rc);
2686 }
2687 if (ses->need_reconnect) {
2688 cifs_dbg(FYI, "Session needs reconnect\n");
2689 rc = cifs_setup_session(xid, ses,
2690 volume_info->local_nls);
2691 if (rc) {
2692 mutex_unlock(&ses->session_mutex);
2693 /* problem -- put our reference */
2694 cifs_put_smb_ses(ses);
2695 free_xid(xid);
2696 return ERR_PTR(rc);
2697 }
2698 }
2699 mutex_unlock(&ses->session_mutex);
2700
2701 /* existing SMB ses has a server reference already */
2702 cifs_put_tcp_session(server, 0);
2703 free_xid(xid);
2704 return ses;
2705 }
2706
2707 cifs_dbg(FYI, "Existing smb sess not found\n");
2708 ses = sesInfoAlloc();
2709 if (ses == NULL)
2710 goto get_ses_fail;
2711
2712 /* new SMB session uses our server ref */
2713 ses->server = server;
2714 if (server->dstaddr.ss_family == AF_INET6)
2715 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2716 else
2717 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2718
2719 if (volume_info->username) {
2720 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2721 if (!ses->user_name)
2722 goto get_ses_fail;
2723 }
2724
2725 /* volume_info->password freed at unmount */
2726 if (volume_info->password) {
2727 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2728 if (!ses->password)
2729 goto get_ses_fail;
2730 }
2731 if (volume_info->domainname) {
2732 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2733 if (!ses->domainName)
2734 goto get_ses_fail;
2735 }
2736 if (volume_info->domainauto)
2737 ses->domainAuto = volume_info->domainauto;
2738 ses->cred_uid = volume_info->cred_uid;
2739 ses->linux_uid = volume_info->linux_uid;
2740
2741 ses->sectype = volume_info->sectype;
2742 ses->sign = volume_info->sign;
2743
2744 mutex_lock(&ses->session_mutex);
2745 rc = cifs_negotiate_protocol(xid, ses);
2746 if (!rc)
2747 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2748 mutex_unlock(&ses->session_mutex);
2749 if (rc)
2750 goto get_ses_fail;
2751
2752 /* success, put it on the list */
2753 spin_lock(&cifs_tcp_ses_lock);
2754 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2755 spin_unlock(&cifs_tcp_ses_lock);
2756
2757 free_xid(xid);
2758
2759 cifs_setup_ipc(ses, volume_info);
2760
2761 return ses;
2762
2763 get_ses_fail:
2764 sesInfoFree(ses);
2765 free_xid(xid);
2766 return ERR_PTR(rc);
2767 }
2768
2769 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2770 {
2771 if (tcon->tidStatus == CifsExiting)
2772 return 0;
2773 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2774 return 0;
2775 if (tcon->seal != volume_info->seal)
2776 return 0;
2777 if (tcon->snapshot_time != volume_info->snapshot_time)
2778 return 0;
2779 return 1;
2780 }
2781
2782 static struct cifs_tcon *
2783 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2784 {
2785 struct list_head *tmp;
2786 struct cifs_tcon *tcon;
2787
2788 spin_lock(&cifs_tcp_ses_lock);
2789 list_for_each(tmp, &ses->tcon_list) {
2790 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2791 if (!match_tcon(tcon, volume_info))
2792 continue;
2793 ++tcon->tc_count;
2794 spin_unlock(&cifs_tcp_ses_lock);
2795 return tcon;
2796 }
2797 spin_unlock(&cifs_tcp_ses_lock);
2798 return NULL;
2799 }
2800
2801 void
2802 cifs_put_tcon(struct cifs_tcon *tcon)
2803 {
2804 unsigned int xid;
2805 struct cifs_ses *ses;
2806
2807 /*
2808 * IPC tcon share the lifetime of their session and are
2809 * destroyed in the session put function
2810 */
2811 if (tcon == NULL || tcon->ipc)
2812 return;
2813
2814 ses = tcon->ses;
2815 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2816 spin_lock(&cifs_tcp_ses_lock);
2817 if (--tcon->tc_count > 0) {
2818 spin_unlock(&cifs_tcp_ses_lock);
2819 return;
2820 }
2821
2822 list_del_init(&tcon->tcon_list);
2823 spin_unlock(&cifs_tcp_ses_lock);
2824
2825 xid = get_xid();
2826 if (ses->server->ops->tree_disconnect)
2827 ses->server->ops->tree_disconnect(xid, tcon);
2828 _free_xid(xid);
2829
2830 cifs_fscache_release_super_cookie(tcon);
2831 tconInfoFree(tcon);
2832 cifs_put_smb_ses(ses);
2833 }
2834
2835 static struct cifs_tcon *
2836 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2837 {
2838 int rc, xid;
2839 struct cifs_tcon *tcon;
2840
2841 tcon = cifs_find_tcon(ses, volume_info);
2842 if (tcon) {
2843 cifs_dbg(FYI, "Found match on UNC path\n");
2844 /* existing tcon already has a reference */
2845 cifs_put_smb_ses(ses);
2846 return tcon;
2847 }
2848
2849 if (!ses->server->ops->tree_connect) {
2850 rc = -ENOSYS;
2851 goto out_fail;
2852 }
2853
2854 tcon = tconInfoAlloc();
2855 if (tcon == NULL) {
2856 rc = -ENOMEM;
2857 goto out_fail;
2858 }
2859
2860 if (volume_info->snapshot_time) {
2861 if (ses->server->vals->protocol_id == 0) {
2862 cifs_dbg(VFS,
2863 "Use SMB2 or later for snapshot mount option\n");
2864 rc = -EOPNOTSUPP;
2865 goto out_fail;
2866 } else
2867 tcon->snapshot_time = volume_info->snapshot_time;
2868 }
2869
2870 tcon->ses = ses;
2871 if (volume_info->password) {
2872 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2873 if (!tcon->password) {
2874 rc = -ENOMEM;
2875 goto out_fail;
2876 }
2877 }
2878
2879 /*
2880 * BB Do we need to wrap session_mutex around this TCon call and Unix
2881 * SetFS as we do on SessSetup and reconnect?
2882 */
2883 xid = get_xid();
2884 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2885 volume_info->local_nls);
2886 free_xid(xid);
2887 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2888 if (rc)
2889 goto out_fail;
2890
2891 if (volume_info->nodfs) {
2892 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2893 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2894 }
2895 tcon->use_persistent = false;
2896 /* check if SMB2 or later, CIFS does not support persistent handles */
2897 if (volume_info->persistent) {
2898 if (ses->server->vals->protocol_id == 0) {
2899 cifs_dbg(VFS,
2900 "SMB3 or later required for persistent handles\n");
2901 rc = -EOPNOTSUPP;
2902 goto out_fail;
2903 } else if (ses->server->capabilities &
2904 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2905 tcon->use_persistent = true;
2906 else /* persistent handles requested but not supported */ {
2907 cifs_dbg(VFS,
2908 "Persistent handles not supported on share\n");
2909 rc = -EOPNOTSUPP;
2910 goto out_fail;
2911 }
2912 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2913 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2914 && (volume_info->nopersistent == false)) {
2915 cifs_dbg(FYI, "enabling persistent handles\n");
2916 tcon->use_persistent = true;
2917 } else if (volume_info->resilient) {
2918 if (ses->server->vals->protocol_id == 0) {
2919 cifs_dbg(VFS,
2920 "SMB2.1 or later required for resilient handles\n");
2921 rc = -EOPNOTSUPP;
2922 goto out_fail;
2923 }
2924 tcon->use_resilient = true;
2925 }
2926
2927 if (volume_info->seal) {
2928 if (ses->server->vals->protocol_id == 0) {
2929 cifs_dbg(VFS,
2930 "SMB3 or later required for encryption\n");
2931 rc = -EOPNOTSUPP;
2932 goto out_fail;
2933 } else if (tcon->ses->server->capabilities &
2934 SMB2_GLOBAL_CAP_ENCRYPTION)
2935 tcon->seal = true;
2936 else {
2937 cifs_dbg(VFS, "Encryption is not supported on share\n");
2938 rc = -EOPNOTSUPP;
2939 goto out_fail;
2940 }
2941 }
2942
2943 /*
2944 * We can have only one retry value for a connection to a share so for
2945 * resources mounted more than once to the same server share the last
2946 * value passed in for the retry flag is used.
2947 */
2948 tcon->retry = volume_info->retry;
2949 tcon->nocase = volume_info->nocase;
2950 tcon->local_lease = volume_info->local_lease;
2951 INIT_LIST_HEAD(&tcon->pending_opens);
2952
2953 spin_lock(&cifs_tcp_ses_lock);
2954 list_add(&tcon->tcon_list, &ses->tcon_list);
2955 spin_unlock(&cifs_tcp_ses_lock);
2956
2957 cifs_fscache_get_super_cookie(tcon);
2958
2959 return tcon;
2960
2961 out_fail:
2962 tconInfoFree(tcon);
2963 return ERR_PTR(rc);
2964 }
2965
2966 void
2967 cifs_put_tlink(struct tcon_link *tlink)
2968 {
2969 if (!tlink || IS_ERR(tlink))
2970 return;
2971
2972 if (!atomic_dec_and_test(&tlink->tl_count) ||
2973 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2974 tlink->tl_time = jiffies;
2975 return;
2976 }
2977
2978 if (!IS_ERR(tlink_tcon(tlink)))
2979 cifs_put_tcon(tlink_tcon(tlink));
2980 kfree(tlink);
2981 return;
2982 }
2983
2984 static inline struct tcon_link *
2985 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2986 {
2987 return cifs_sb->master_tlink;
2988 }
2989
2990 static int
2991 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2992 {
2993 struct cifs_sb_info *old = CIFS_SB(sb);
2994 struct cifs_sb_info *new = mnt_data->cifs_sb;
2995
2996 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2997 return 0;
2998
2999 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
3000 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
3001 return 0;
3002
3003 /*
3004 * We want to share sb only if we don't specify an r/wsize or
3005 * specified r/wsize is greater than or equal to existing one.
3006 */
3007 if (new->wsize && new->wsize < old->wsize)
3008 return 0;
3009
3010 if (new->rsize && new->rsize < old->rsize)
3011 return 0;
3012
3013 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3014 return 0;
3015
3016 if (old->mnt_file_mode != new->mnt_file_mode ||
3017 old->mnt_dir_mode != new->mnt_dir_mode)
3018 return 0;
3019
3020 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3021 return 0;
3022
3023 if (old->actimeo != new->actimeo)
3024 return 0;
3025
3026 return 1;
3027 }
3028
3029 static int
3030 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3031 {
3032 struct cifs_sb_info *old = CIFS_SB(sb);
3033 struct cifs_sb_info *new = mnt_data->cifs_sb;
3034 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3035 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3036
3037 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3038 return 1;
3039 else if (!old_set && !new_set)
3040 return 1;
3041
3042 return 0;
3043 }
3044
3045 int
3046 cifs_match_super(struct super_block *sb, void *data)
3047 {
3048 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3049 struct smb_vol *volume_info;
3050 struct cifs_sb_info *cifs_sb;
3051 struct TCP_Server_Info *tcp_srv;
3052 struct cifs_ses *ses;
3053 struct cifs_tcon *tcon;
3054 struct tcon_link *tlink;
3055 int rc = 0;
3056
3057 spin_lock(&cifs_tcp_ses_lock);
3058 cifs_sb = CIFS_SB(sb);
3059 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3060 if (IS_ERR(tlink)) {
3061 spin_unlock(&cifs_tcp_ses_lock);
3062 return rc;
3063 }
3064 tcon = tlink_tcon(tlink);
3065 ses = tcon->ses;
3066 tcp_srv = ses->server;
3067
3068 volume_info = mnt_data->vol;
3069
3070 if (!match_server(tcp_srv, volume_info) ||
3071 !match_session(ses, volume_info) ||
3072 !match_tcon(tcon, volume_info) ||
3073 !match_prepath(sb, mnt_data)) {
3074 rc = 0;
3075 goto out;
3076 }
3077
3078 rc = compare_mount_options(sb, mnt_data);
3079 out:
3080 spin_unlock(&cifs_tcp_ses_lock);
3081 cifs_put_tlink(tlink);
3082 return rc;
3083 }
3084
3085 int
3086 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
3087 const struct nls_table *nls_codepage, unsigned int *num_referrals,
3088 struct dfs_info3_param **referrals, int remap)
3089 {
3090 int rc = 0;
3091
3092 if (!ses->server->ops->get_dfs_refer)
3093 return -ENOSYS;
3094
3095 *num_referrals = 0;
3096 *referrals = NULL;
3097
3098 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3099 referrals, num_referrals,
3100 nls_codepage, remap);
3101 return rc;
3102 }
3103
3104 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3105 static struct lock_class_key cifs_key[2];
3106 static struct lock_class_key cifs_slock_key[2];
3107
3108 static inline void
3109 cifs_reclassify_socket4(struct socket *sock)
3110 {
3111 struct sock *sk = sock->sk;
3112 BUG_ON(!sock_allow_reclassification(sk));
3113 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3114 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3115 }
3116
3117 static inline void
3118 cifs_reclassify_socket6(struct socket *sock)
3119 {
3120 struct sock *sk = sock->sk;
3121 BUG_ON(!sock_allow_reclassification(sk));
3122 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3123 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3124 }
3125 #else
3126 static inline void
3127 cifs_reclassify_socket4(struct socket *sock)
3128 {
3129 }
3130
3131 static inline void
3132 cifs_reclassify_socket6(struct socket *sock)
3133 {
3134 }
3135 #endif
3136
3137 /* See RFC1001 section 14 on representation of Netbios names */
3138 static void rfc1002mangle(char *target, char *source, unsigned int length)
3139 {
3140 unsigned int i, j;
3141
3142 for (i = 0, j = 0; i < (length); i++) {
3143 /* mask a nibble at a time and encode */
3144 target[j] = 'A' + (0x0F & (source[i] >> 4));
3145 target[j+1] = 'A' + (0x0F & source[i]);
3146 j += 2;
3147 }
3148
3149 }
3150
3151 static int
3152 bind_socket(struct TCP_Server_Info *server)
3153 {
3154 int rc = 0;
3155 if (server->srcaddr.ss_family != AF_UNSPEC) {
3156 /* Bind to the specified local IP address */
3157 struct socket *socket = server->ssocket;
3158 rc = socket->ops->bind(socket,
3159 (struct sockaddr *) &server->srcaddr,
3160 sizeof(server->srcaddr));
3161 if (rc < 0) {
3162 struct sockaddr_in *saddr4;
3163 struct sockaddr_in6 *saddr6;
3164 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3165 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3166 if (saddr6->sin6_family == AF_INET6)
3167 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3168 &saddr6->sin6_addr, rc);
3169 else
3170 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3171 &saddr4->sin_addr.s_addr, rc);
3172 }
3173 }
3174 return rc;
3175 }
3176
3177 static int
3178 ip_rfc1001_connect(struct TCP_Server_Info *server)
3179 {
3180 int rc = 0;
3181 /*
3182 * some servers require RFC1001 sessinit before sending
3183 * negprot - BB check reconnection in case where second
3184 * sessinit is sent but no second negprot
3185 */
3186 struct rfc1002_session_packet *ses_init_buf;
3187 struct smb_hdr *smb_buf;
3188 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3189 GFP_KERNEL);
3190 if (ses_init_buf) {
3191 ses_init_buf->trailer.session_req.called_len = 32;
3192
3193 if (server->server_RFC1001_name[0] != 0)
3194 rfc1002mangle(ses_init_buf->trailer.
3195 session_req.called_name,
3196 server->server_RFC1001_name,
3197 RFC1001_NAME_LEN_WITH_NULL);
3198 else
3199 rfc1002mangle(ses_init_buf->trailer.
3200 session_req.called_name,
3201 DEFAULT_CIFS_CALLED_NAME,
3202 RFC1001_NAME_LEN_WITH_NULL);
3203
3204 ses_init_buf->trailer.session_req.calling_len = 32;
3205
3206 /*
3207 * calling name ends in null (byte 16) from old smb
3208 * convention.
3209 */
3210 if (server->workstation_RFC1001_name[0] != 0)
3211 rfc1002mangle(ses_init_buf->trailer.
3212 session_req.calling_name,
3213 server->workstation_RFC1001_name,
3214 RFC1001_NAME_LEN_WITH_NULL);
3215 else
3216 rfc1002mangle(ses_init_buf->trailer.
3217 session_req.calling_name,
3218 "LINUX_CIFS_CLNT",
3219 RFC1001_NAME_LEN_WITH_NULL);
3220
3221 ses_init_buf->trailer.session_req.scope1 = 0;
3222 ses_init_buf->trailer.session_req.scope2 = 0;
3223 smb_buf = (struct smb_hdr *)ses_init_buf;
3224
3225 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3226 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3227 rc = smb_send(server, smb_buf, 0x44);
3228 kfree(ses_init_buf);
3229 /*
3230 * RFC1001 layer in at least one server
3231 * requires very short break before negprot
3232 * presumably because not expecting negprot
3233 * to follow so fast. This is a simple
3234 * solution that works without
3235 * complicating the code and causes no
3236 * significant slowing down on mount
3237 * for everyone else
3238 */
3239 usleep_range(1000, 2000);
3240 }
3241 /*
3242 * else the negprot may still work without this
3243 * even though malloc failed
3244 */
3245
3246 return rc;
3247 }
3248
3249 static int
3250 generic_ip_connect(struct TCP_Server_Info *server)
3251 {
3252 int rc = 0;
3253 __be16 sport;
3254 int slen, sfamily;
3255 struct socket *socket = server->ssocket;
3256 struct sockaddr *saddr;
3257
3258 saddr = (struct sockaddr *) &server->dstaddr;
3259
3260 if (server->dstaddr.ss_family == AF_INET6) {
3261 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3262 slen = sizeof(struct sockaddr_in6);
3263 sfamily = AF_INET6;
3264 } else {
3265 sport = ((struct sockaddr_in *) saddr)->sin_port;
3266 slen = sizeof(struct sockaddr_in);
3267 sfamily = AF_INET;
3268 }
3269
3270 if (socket == NULL) {
3271 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3272 IPPROTO_TCP, &socket, 1);
3273 if (rc < 0) {
3274 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3275 server->ssocket = NULL;
3276 return rc;
3277 }
3278
3279 /* BB other socket options to set KEEPALIVE, NODELAY? */
3280 cifs_dbg(FYI, "Socket created\n");
3281 server->ssocket = socket;
3282 socket->sk->sk_allocation = GFP_NOFS;
3283 if (sfamily == AF_INET6)
3284 cifs_reclassify_socket6(socket);
3285 else
3286 cifs_reclassify_socket4(socket);
3287 }
3288
3289 rc = bind_socket(server);
3290 if (rc < 0)
3291 return rc;
3292
3293 /*
3294 * Eventually check for other socket options to change from
3295 * the default. sock_setsockopt not used because it expects
3296 * user space buffer
3297 */
3298 socket->sk->sk_rcvtimeo = 7 * HZ;
3299 socket->sk->sk_sndtimeo = 5 * HZ;
3300
3301 /* make the bufsizes depend on wsize/rsize and max requests */
3302 if (server->noautotune) {
3303 if (socket->sk->sk_sndbuf < (200 * 1024))
3304 socket->sk->sk_sndbuf = 200 * 1024;
3305 if (socket->sk->sk_rcvbuf < (140 * 1024))
3306 socket->sk->sk_rcvbuf = 140 * 1024;
3307 }
3308
3309 if (server->tcp_nodelay) {
3310 int val = 1;
3311 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3312 (char *)&val, sizeof(val));
3313 if (rc)
3314 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3315 rc);
3316 }
3317
3318 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3319 socket->sk->sk_sndbuf,
3320 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3321
3322 rc = socket->ops->connect(socket, saddr, slen, 0);
3323 if (rc < 0) {
3324 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3325 sock_release(socket);
3326 server->ssocket = NULL;
3327 return rc;
3328 }
3329
3330 if (sport == htons(RFC1001_PORT))
3331 rc = ip_rfc1001_connect(server);
3332
3333 return rc;
3334 }
3335
3336 static int
3337 ip_connect(struct TCP_Server_Info *server)
3338 {
3339 __be16 *sport;
3340 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3341 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3342
3343 if (server->dstaddr.ss_family == AF_INET6)
3344 sport = &addr6->sin6_port;
3345 else
3346 sport = &addr->sin_port;
3347
3348 if (*sport == 0) {
3349 int rc;
3350
3351 /* try with 445 port at first */
3352 *sport = htons(CIFS_PORT);
3353
3354 rc = generic_ip_connect(server);
3355 if (rc >= 0)
3356 return rc;
3357
3358 /* if it failed, try with 139 port */
3359 *sport = htons(RFC1001_PORT);
3360 }
3361
3362 return generic_ip_connect(server);
3363 }
3364
3365 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3366 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3367 {
3368 /* if we are reconnecting then should we check to see if
3369 * any requested capabilities changed locally e.g. via
3370 * remount but we can not do much about it here
3371 * if they have (even if we could detect it by the following)
3372 * Perhaps we could add a backpointer to array of sb from tcon
3373 * or if we change to make all sb to same share the same
3374 * sb as NFS - then we only have one backpointer to sb.
3375 * What if we wanted to mount the server share twice once with
3376 * and once without posixacls or posix paths? */
3377 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3378
3379 if (vol_info && vol_info->no_linux_ext) {
3380 tcon->fsUnixInfo.Capability = 0;
3381 tcon->unix_ext = 0; /* Unix Extensions disabled */
3382 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3383 return;
3384 } else if (vol_info)
3385 tcon->unix_ext = 1; /* Unix Extensions supported */
3386
3387 if (tcon->unix_ext == 0) {
3388 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3389 return;
3390 }
3391
3392 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3393 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3394 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3395 /* check for reconnect case in which we do not
3396 want to change the mount behavior if we can avoid it */
3397 if (vol_info == NULL) {
3398 /* turn off POSIX ACL and PATHNAMES if not set
3399 originally at mount time */
3400 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3401 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3402 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3403 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3404 cifs_dbg(VFS, "POSIXPATH support change\n");
3405 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3406 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3407 cifs_dbg(VFS, "possible reconnect error\n");
3408 cifs_dbg(VFS, "server disabled POSIX path support\n");
3409 }
3410 }
3411
3412 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3413 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3414
3415 cap &= CIFS_UNIX_CAP_MASK;
3416 if (vol_info && vol_info->no_psx_acl)
3417 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3418 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3419 cifs_dbg(FYI, "negotiated posix acl support\n");
3420 if (cifs_sb)
3421 cifs_sb->mnt_cifs_flags |=
3422 CIFS_MOUNT_POSIXACL;
3423 }
3424
3425 if (vol_info && vol_info->posix_paths == 0)
3426 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3427 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3428 cifs_dbg(FYI, "negotiate posix pathnames\n");
3429 if (cifs_sb)
3430 cifs_sb->mnt_cifs_flags |=
3431 CIFS_MOUNT_POSIX_PATHS;
3432 }
3433
3434 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3435 #ifdef CONFIG_CIFS_DEBUG2
3436 if (cap & CIFS_UNIX_FCNTL_CAP)
3437 cifs_dbg(FYI, "FCNTL cap\n");
3438 if (cap & CIFS_UNIX_EXTATTR_CAP)
3439 cifs_dbg(FYI, "EXTATTR cap\n");
3440 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3441 cifs_dbg(FYI, "POSIX path cap\n");
3442 if (cap & CIFS_UNIX_XATTR_CAP)
3443 cifs_dbg(FYI, "XATTR cap\n");
3444 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3445 cifs_dbg(FYI, "POSIX ACL cap\n");
3446 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3447 cifs_dbg(FYI, "very large read cap\n");
3448 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3449 cifs_dbg(FYI, "very large write cap\n");
3450 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3451 cifs_dbg(FYI, "transport encryption cap\n");
3452 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3453 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3454 #endif /* CIFS_DEBUG2 */
3455 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3456 if (vol_info == NULL) {
3457 cifs_dbg(FYI, "resetting capabilities failed\n");
3458 } else
3459 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");
3460
3461 }
3462 }
3463 }
3464
3465 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3466 struct cifs_sb_info *cifs_sb)
3467 {
3468 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3469
3470 spin_lock_init(&cifs_sb->tlink_tree_lock);
3471 cifs_sb->tlink_tree = RB_ROOT;
3472
3473 /*
3474 * Temporarily set r/wsize for matching superblock. If we end up using
3475 * new sb then client will later negotiate it downward if needed.
3476 */
3477 cifs_sb->rsize = pvolume_info->rsize;
3478 cifs_sb->wsize = pvolume_info->wsize;
3479
3480 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3481 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3482 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3483 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3484 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3485 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3486
3487 cifs_sb->actimeo = pvolume_info->actimeo;
3488 cifs_sb->local_nls = pvolume_info->local_nls;
3489
3490 if (pvolume_info->noperm)
3491 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3492 if (pvolume_info->setuids)
3493 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3494 if (pvolume_info->setuidfromacl)
3495 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3496 if (pvolume_info->server_ino)
3497 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3498 if (pvolume_info->remap)
3499 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3500 if (pvolume_info->sfu_remap)
3501 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3502 if (pvolume_info->no_xattr)
3503 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3504 if (pvolume_info->sfu_emul)
3505 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3506 if (pvolume_info->nobrl)
3507 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3508 if (pvolume_info->nostrictsync)
3509 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3510 if (pvolume_info->mand_lock)
3511 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3512 if (pvolume_info->rwpidforward)
3513 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3514 if (pvolume_info->cifs_acl)
3515 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3516 if (pvolume_info->backupuid_specified) {
3517 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3518 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3519 }
3520 if (pvolume_info->backupgid_specified) {
3521 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3522 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3523 }
3524 if (pvolume_info->override_uid)
3525 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3526 if (pvolume_info->override_gid)
3527 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3528 if (pvolume_info->dynperm)
3529 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3530 if (pvolume_info->fsc)
3531 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3532 if (pvolume_info->multiuser)
3533 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3534 CIFS_MOUNT_NO_PERM);
3535 if (pvolume_info->strict_io)
3536 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3537 if (pvolume_info->direct_io) {
3538 cifs_dbg(FYI, "mounting share using direct i/o\n");
3539 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3540 }
3541 if (pvolume_info->mfsymlinks) {
3542 if (pvolume_info->sfu_emul) {
3543 /*
3544 * Our SFU ("Services for Unix" emulation does not allow
3545 * creating symlinks but does allow reading existing SFU
3546 * symlinks (it does allow both creating and reading SFU
3547 * style mknod and FIFOs though). When "mfsymlinks" and
3548 * "sfu" are both enabled at the same time, it allows
3549 * reading both types of symlinks, but will only create
3550 * them with mfsymlinks format. This allows better
3551 * Apple compatibility (probably better for Samba too)
3552 * while still recognizing old Windows style symlinks.
3553 */
3554 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3555 }
3556 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3557 }
3558
3559 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3560 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3561
3562 if (pvolume_info->prepath) {
3563 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3564 if (cifs_sb->prepath == NULL)
3565 return -ENOMEM;
3566 }
3567
3568 return 0;
3569 }
3570
3571 static void
3572 cleanup_volume_info_contents(struct smb_vol *volume_info)
3573 {
3574 kfree(volume_info->username);
3575 kzfree(volume_info->password);
3576 kfree(volume_info->UNC);
3577 kfree(volume_info->domainname);
3578 kfree(volume_info->iocharset);
3579 kfree(volume_info->prepath);
3580 }
3581
3582 void
3583 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3584 {
3585 if (!volume_info)
3586 return;
3587 cleanup_volume_info_contents(volume_info);
3588 kfree(volume_info);
3589 }
3590
3591
3592 #ifdef CONFIG_CIFS_DFS_UPCALL
3593 /*
3594 * cifs_build_path_to_root returns full path to root when we do not have an
3595 * exiting connection (tcon)
3596 */
3597 static char *
3598 build_unc_path_to_root(const struct smb_vol *vol,
3599 const struct cifs_sb_info *cifs_sb)
3600 {
3601 char *full_path, *pos;
3602 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3603 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3604
3605 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3606 if (full_path == NULL)
3607 return ERR_PTR(-ENOMEM);
3608
3609 strncpy(full_path, vol->UNC, unc_len);
3610 pos = full_path + unc_len;
3611
3612 if (pplen) {
3613 *pos = CIFS_DIR_SEP(cifs_sb);
3614 strncpy(pos + 1, vol->prepath, pplen);
3615 pos += pplen;
3616 }
3617
3618 *pos = '\0'; /* add trailing null */
3619 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3620 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3621 return full_path;
3622 }
3623
3624 /*
3625 * Perform a dfs referral query for a share and (optionally) prefix
3626 *
3627 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3628 * to a string containing updated options for the submount. Otherwise it
3629 * will be left untouched.
3630 *
3631 * Returns the rc from get_dfs_path to the caller, which can be used to
3632 * determine whether there were referrals.
3633 */
3634 static int
3635 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3636 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3637 int check_prefix)
3638 {
3639 int rc;
3640 unsigned int num_referrals = 0;
3641 struct dfs_info3_param *referrals = NULL;
3642 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3643
3644 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3645 if (IS_ERR(full_path))
3646 return PTR_ERR(full_path);
3647
3648 /* For DFS paths, skip the first '\' of the UNC */
3649 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3650
3651 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3652 &num_referrals, &referrals, cifs_remap(cifs_sb));
3653
3654 if (!rc && num_referrals > 0) {
3655 char *fake_devname = NULL;
3656
3657 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3658 full_path + 1, referrals,
3659 &fake_devname);
3660
3661 free_dfs_info_array(referrals, num_referrals);
3662
3663 if (IS_ERR(mdata)) {
3664 rc = PTR_ERR(mdata);
3665 mdata = NULL;
3666 } else {
3667 cleanup_volume_info_contents(volume_info);
3668 rc = cifs_setup_volume_info(volume_info, mdata,
3669 fake_devname);
3670 }
3671 kfree(fake_devname);
3672 kfree(cifs_sb->mountdata);
3673 cifs_sb->mountdata = mdata;
3674 }
3675 kfree(full_path);
3676 return rc;
3677 }
3678 #endif
3679
3680 static int
3681 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3682 const char *devname)
3683 {
3684 int rc = 0;
3685
3686 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3687 return -EINVAL;
3688
3689 if (volume_info->nullauth) {
3690 cifs_dbg(FYI, "Anonymous login\n");
3691 kfree(volume_info->username);
3692 volume_info->username = NULL;
3693 } else if (volume_info->username) {
3694 /* BB fixme parse for domain name here */
3695 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3696 } else {
3697 cifs_dbg(VFS, "No username specified\n");
3698 /* In userspace mount helper we can get user name from alternate
3699 locations such as env variables and files on disk */
3700 return -EINVAL;
3701 }
3702
3703 /* this is needed for ASCII cp to Unicode converts */
3704 if (volume_info->iocharset == NULL) {
3705 /* load_nls_default cannot return null */
3706 volume_info->local_nls = load_nls_default();
3707 } else {
3708 volume_info->local_nls = load_nls(volume_info->iocharset);
3709 if (volume_info->local_nls == NULL) {
3710 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3711 volume_info->iocharset);
3712 return -ELIBACC;
3713 }
3714 }
3715
3716 return rc;
3717 }
3718
3719 struct smb_vol *
3720 cifs_get_volume_info(char *mount_data, const char *devname)
3721 {
3722 int rc;
3723 struct smb_vol *volume_info;
3724
3725 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3726 if (!volume_info)
3727 return ERR_PTR(-ENOMEM);
3728
3729 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3730 if (rc) {
3731 cifs_cleanup_volume_info(volume_info);
3732 volume_info = ERR_PTR(rc);
3733 }
3734
3735 return volume_info;
3736 }
3737
3738 static int
3739 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3740 unsigned int xid,
3741 struct cifs_tcon *tcon,
3742 struct cifs_sb_info *cifs_sb,
3743 char *full_path)
3744 {
3745 int rc;
3746 char *s;
3747 char sep, tmp;
3748
3749 sep = CIFS_DIR_SEP(cifs_sb);
3750 s = full_path;
3751
3752 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3753 while (rc == 0) {
3754 /* skip separators */
3755 while (*s == sep)
3756 s++;
3757 if (!*s)
3758 break;
3759 /* next separator */
3760 while (*s && *s != sep)
3761 s++;
3762
3763 /*
3764 * temporarily null-terminate the path at the end of
3765 * the current component
3766 */
3767 tmp = *s;
3768 *s = 0;
3769 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3770 full_path);
3771 *s = tmp;
3772 }
3773 return rc;
3774 }
3775
3776 int
3777 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3778 {
3779 int rc;
3780 unsigned int xid;
3781 struct cifs_ses *ses;
3782 struct cifs_tcon *tcon;
3783 struct TCP_Server_Info *server;
3784 char *full_path;
3785 struct tcon_link *tlink;
3786 #ifdef CONFIG_CIFS_DFS_UPCALL
3787 int referral_walks_count = 0;
3788 #endif
3789
3790 #ifdef CONFIG_CIFS_DFS_UPCALL
3791 try_mount_again:
3792 /* cleanup activities if we're chasing a referral */
3793 if (referral_walks_count) {
3794 if (tcon)
3795 cifs_put_tcon(tcon);
3796 else if (ses)
3797 cifs_put_smb_ses(ses);
3798
3799 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3800
3801 free_xid(xid);
3802 }
3803 #endif
3804 rc = 0;
3805 tcon = NULL;
3806 ses = NULL;
3807 server = NULL;
3808 full_path = NULL;
3809 tlink = NULL;
3810
3811 xid = get_xid();
3812
3813 /* get a reference to a tcp session */
3814 server = cifs_get_tcp_session(volume_info);
3815 if (IS_ERR(server)) {
3816 rc = PTR_ERR(server);
3817 goto out;
3818 }
3819 if ((volume_info->max_credits < 20) ||
3820 (volume_info->max_credits > 60000))
3821 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3822 else
3823 server->max_credits = volume_info->max_credits;
3824 /* get a reference to a SMB session */
3825 ses = cifs_get_smb_ses(server, volume_info);
3826 if (IS_ERR(ses)) {
3827 rc = PTR_ERR(ses);
3828 ses = NULL;
3829 goto mount_fail_check;
3830 }
3831
3832 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3833 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3834 cifs_dbg(VFS, "persistent handles not supported by server\n");
3835 rc = -EOPNOTSUPP;
3836 goto mount_fail_check;
3837 }
3838
3839 /* search for existing tcon to this server share */
3840 tcon = cifs_get_tcon(ses, volume_info);
3841 if (IS_ERR(tcon)) {
3842 rc = PTR_ERR(tcon);
3843 tcon = NULL;
3844 if (rc == -EACCES)
3845 goto mount_fail_check;
3846
3847 goto remote_path_check;
3848 }
3849
3850 /* tell server which Unix caps we support */
3851 if (cap_unix(tcon->ses)) {
3852 /* reset of caps checks mount to see if unix extensions
3853 disabled for just this mount */
3854 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3855 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3856 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3857 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3858 rc = -EACCES;
3859 goto mount_fail_check;
3860 }
3861 } else
3862 tcon->unix_ext = 0; /* server does not support them */
3863
3864 /* do not care if a following call succeed - informational */
3865 if (!tcon->pipe && server->ops->qfs_tcon)
3866 server->ops->qfs_tcon(xid, tcon);
3867
3868 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3869 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3870
3871 remote_path_check:
3872 #ifdef CONFIG_CIFS_DFS_UPCALL
3873 /*
3874 * Perform an unconditional check for whether there are DFS
3875 * referrals for this path without prefix, to provide support
3876 * for DFS referrals from w2k8 servers which don't seem to respond
3877 * with PATH_NOT_COVERED to requests that include the prefix.
3878 * Chase the referral if found, otherwise continue normally.
3879 */
3880 if (referral_walks_count == 0) {
3881 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3882 false);
3883 if (!refrc) {
3884 referral_walks_count++;
3885 goto try_mount_again;
3886 }
3887 }
3888 #endif
3889
3890 /* check if a whole path is not remote */
3891 if (!rc && tcon) {
3892 if (!server->ops->is_path_accessible) {
3893 rc = -ENOSYS;
3894 goto mount_fail_check;
3895 }
3896 /*
3897 * cifs_build_path_to_root works only when we have a valid tcon
3898 */
3899 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3900 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3901 if (full_path == NULL) {
3902 rc = -ENOMEM;
3903 goto mount_fail_check;
3904 }
3905 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3906 full_path);
3907 if (rc != 0 && rc != -EREMOTE) {
3908 kfree(full_path);
3909 goto mount_fail_check;
3910 }
3911
3912 if (rc != -EREMOTE) {
3913 rc = cifs_are_all_path_components_accessible(server,
3914 xid, tcon, cifs_sb,
3915 full_path);
3916 if (rc != 0) {
3917 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3918 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3919 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3920 rc = 0;
3921 }
3922 }
3923 kfree(full_path);
3924 }
3925
3926 /* get referral if needed */
3927 if (rc == -EREMOTE) {
3928 #ifdef CONFIG_CIFS_DFS_UPCALL
3929 if (referral_walks_count > MAX_NESTED_LINKS) {
3930 /*
3931 * BB: when we implement proper loop detection,
3932 * we will remove this check. But now we need it
3933 * to prevent an indefinite loop if 'DFS tree' is
3934 * misconfigured (i.e. has loops).
3935 */
3936 rc = -ELOOP;
3937 goto mount_fail_check;
3938 }
3939
3940 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3941
3942 if (!rc) {
3943 referral_walks_count++;
3944 goto try_mount_again;
3945 }
3946 goto mount_fail_check;
3947 #else /* No DFS support, return error on mount */
3948 rc = -EOPNOTSUPP;
3949 #endif
3950 }
3951
3952 if (rc)
3953 goto mount_fail_check;
3954
3955 /* now, hang the tcon off of the superblock */
3956 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3957 if (tlink == NULL) {
3958 rc = -ENOMEM;
3959 goto mount_fail_check;
3960 }
3961
3962 tlink->tl_uid = ses->linux_uid;
3963 tlink->tl_tcon = tcon;
3964 tlink->tl_time = jiffies;
3965 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3966 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3967
3968 cifs_sb->master_tlink = tlink;
3969 spin_lock(&cifs_sb->tlink_tree_lock);
3970 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3971 spin_unlock(&cifs_sb->tlink_tree_lock);
3972
3973 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3974 TLINK_IDLE_EXPIRE);
3975
3976 mount_fail_check:
3977 /* on error free sesinfo and tcon struct if needed */
3978 if (rc) {
3979 /* If find_unc succeeded then rc == 0 so we can not end */
3980 /* up accidentally freeing someone elses tcon struct */
3981 if (tcon)
3982 cifs_put_tcon(tcon);
3983 else if (ses)
3984 cifs_put_smb_ses(ses);
3985 else
3986 cifs_put_tcp_session(server, 0);
3987 }
3988
3989 out:
3990 free_xid(xid);
3991 return rc;
3992 }
3993
3994 /*
3995 * Issue a TREE_CONNECT request.
3996 */
3997 int
3998 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3999 const char *tree, struct cifs_tcon *tcon,
4000 const struct nls_table *nls_codepage)
4001 {
4002 struct smb_hdr *smb_buffer;
4003 struct smb_hdr *smb_buffer_response;
4004 TCONX_REQ *pSMB;
4005 TCONX_RSP *pSMBr;
4006 unsigned char *bcc_ptr;
4007 int rc = 0;
4008 int length;
4009 __u16 bytes_left, count;
4010
4011 if (ses == NULL)
4012 return -EIO;
4013
4014 smb_buffer = cifs_buf_get();
4015 if (smb_buffer == NULL)
4016 return -ENOMEM;
4017
4018 smb_buffer_response = smb_buffer;
4019
4020 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
4021 NULL /*no tid */ , 4 /*wct */ );
4022
4023 smb_buffer->Mid = get_next_mid(ses->server);
4024 smb_buffer->Uid = ses->Suid;
4025 pSMB = (TCONX_REQ *) smb_buffer;
4026 pSMBr = (TCONX_RSP *) smb_buffer_response;
4027
4028 pSMB->AndXCommand = 0xFF;
4029 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
4030 bcc_ptr = &pSMB->Password[0];
4031 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
4032 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
4033 *bcc_ptr = 0; /* password is null byte */
4034 bcc_ptr++; /* skip password */
4035 /* already aligned so no need to do it below */
4036 } else {
4037 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
4038 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
4039 specified as required (when that support is added to
4040 the vfs in the future) as only NTLM or the much
4041 weaker LANMAN (which we do not send by default) is accepted
4042 by Samba (not sure whether other servers allow
4043 NTLMv2 password here) */
4044 #ifdef CONFIG_CIFS_WEAK_PW_HASH
4045 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
4046 (ses->sectype == LANMAN))
4047 calc_lanman_hash(tcon->password, ses->server->cryptkey,
4048 ses->server->sec_mode &
4049 SECMODE_PW_ENCRYPT ? true : false,
4050 bcc_ptr);
4051 else
4052 #endif /* CIFS_WEAK_PW_HASH */
4053 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
4054 bcc_ptr, nls_codepage);
4055 if (rc) {
4056 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
4057 __func__, rc);
4058 cifs_buf_release(smb_buffer);
4059 return rc;
4060 }
4061
4062 bcc_ptr += CIFS_AUTH_RESP_SIZE;
4063 if (ses->capabilities & CAP_UNICODE) {
4064 /* must align unicode strings */
4065 *bcc_ptr = 0; /* null byte password */
4066 bcc_ptr++;
4067 }
4068 }
4069
4070 if (ses->server->sign)
4071 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4072
4073 if (ses->capabilities & CAP_STATUS32) {
4074 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4075 }
4076 if (ses->capabilities & CAP_DFS) {
4077 smb_buffer->Flags2 |= SMBFLG2_DFS;
4078 }
4079 if (ses->capabilities & CAP_UNICODE) {
4080 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4081 length =
4082 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4083 6 /* max utf8 char length in bytes */ *
4084 (/* server len*/ + 256 /* share len */), nls_codepage);
4085 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4086 bcc_ptr += 2; /* skip trailing null */
4087 } else { /* ASCII */
4088 strcpy(bcc_ptr, tree);
4089 bcc_ptr += strlen(tree) + 1;
4090 }
4091 strcpy(bcc_ptr, "?????");
4092 bcc_ptr += strlen("?????");
4093 bcc_ptr += 1;
4094 count = bcc_ptr - &pSMB->Password[0];
4095 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4096 pSMB->hdr.smb_buf_length) + count);
4097 pSMB->ByteCount = cpu_to_le16(count);
4098
4099 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4100 0);
4101
4102 /* above now done in SendReceive */
4103 if (rc == 0) {
4104 bool is_unicode;
4105
4106 tcon->tidStatus = CifsGood;
4107 tcon->need_reconnect = false;
4108 tcon->tid = smb_buffer_response->Tid;
4109 bcc_ptr = pByteArea(smb_buffer_response);
4110 bytes_left = get_bcc(smb_buffer_response);
4111 length = strnlen(bcc_ptr, bytes_left - 2);
4112 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4113 is_unicode = true;
4114 else
4115 is_unicode = false;
4116
4117
4118 /* skip service field (NB: this field is always ASCII) */
4119 if (length == 3) {
4120 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4121 (bcc_ptr[2] == 'C')) {
4122 cifs_dbg(FYI, "IPC connection\n");
4123 tcon->ipc = true;
4124 tcon->pipe = true;
4125 }
4126 } else if (length == 2) {
4127 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4128 /* the most common case */
4129 cifs_dbg(FYI, "disk share connection\n");
4130 }
4131 }
4132 bcc_ptr += length + 1;
4133 bytes_left -= (length + 1);
4134 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4135
4136 /* mostly informational -- no need to fail on error here */
4137 kfree(tcon->nativeFileSystem);
4138 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4139 bytes_left, is_unicode,
4140 nls_codepage);
4141
4142 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4143
4144 if ((smb_buffer_response->WordCount == 3) ||
4145 (smb_buffer_response->WordCount == 7))
4146 /* field is in same location */
4147 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4148 else
4149 tcon->Flags = 0;
4150 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4151 }
4152
4153 cifs_buf_release(smb_buffer);
4154 return rc;
4155 }
4156
4157 static void delayed_free(struct rcu_head *p)
4158 {
4159 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4160 unload_nls(sbi->local_nls);
4161 kfree(sbi);
4162 }
4163
4164 void
4165 cifs_umount(struct cifs_sb_info *cifs_sb)
4166 {
4167 struct rb_root *root = &cifs_sb->tlink_tree;
4168 struct rb_node *node;
4169 struct tcon_link *tlink;
4170
4171 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4172
4173 spin_lock(&cifs_sb->tlink_tree_lock);
4174 while ((node = rb_first(root))) {
4175 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4176 cifs_get_tlink(tlink);
4177 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4178 rb_erase(node, root);
4179
4180 spin_unlock(&cifs_sb->tlink_tree_lock);
4181 cifs_put_tlink(tlink);
4182 spin_lock(&cifs_sb->tlink_tree_lock);
4183 }
4184 spin_unlock(&cifs_sb->tlink_tree_lock);
4185
4186 kfree(cifs_sb->mountdata);
4187 kfree(cifs_sb->prepath);
4188 call_rcu(&cifs_sb->rcu, delayed_free);
4189 }
4190
4191 int
4192 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4193 {
4194 int rc = 0;
4195 struct TCP_Server_Info *server = ses->server;
4196
4197 if (!server->ops->need_neg || !server->ops->negotiate)
4198 return -ENOSYS;
4199
4200 /* only send once per connect */
4201 if (!server->ops->need_neg(server))
4202 return 0;
4203
4204 set_credits(server, 1);
4205
4206 rc = server->ops->negotiate(xid, ses);
4207 if (rc == 0) {
4208 spin_lock(&GlobalMid_Lock);
4209 if (server->tcpStatus == CifsNeedNegotiate)
4210 server->tcpStatus = CifsGood;
4211 else
4212 rc = -EHOSTDOWN;
4213 spin_unlock(&GlobalMid_Lock);
4214 }
4215
4216 return rc;
4217 }
4218
4219 int
4220 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4221 struct nls_table *nls_info)
4222 {
4223 int rc = -ENOSYS;
4224 struct TCP_Server_Info *server = ses->server;
4225
4226 ses->capabilities = server->capabilities;
4227 if (linuxExtEnabled == 0)
4228 ses->capabilities &= (~server->vals->cap_unix);
4229
4230 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4231 server->sec_mode, server->capabilities, server->timeAdj);
4232
4233 if (ses->auth_key.response) {
4234 cifs_dbg(VFS, "Free previous auth_key.response = %p\n",
4235 ses->auth_key.response);
4236 kfree(ses->auth_key.response);
4237 ses->auth_key.response = NULL;
4238 ses->auth_key.len = 0;
4239 }
4240
4241 if (server->ops->sess_setup)
4242 rc = server->ops->sess_setup(xid, ses, nls_info);
4243
4244 if (rc)
4245 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4246
4247 return rc;
4248 }
4249
4250 static int
4251 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4252 {
4253 vol->sectype = ses->sectype;
4254
4255 /* krb5 is special, since we don't need username or pw */
4256 if (vol->sectype == Kerberos)
4257 return 0;
4258
4259 return cifs_set_cifscreds(vol, ses);
4260 }
4261
4262 static struct cifs_tcon *
4263 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4264 {
4265 int rc;
4266 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4267 struct cifs_ses *ses;
4268 struct cifs_tcon *tcon = NULL;
4269 struct smb_vol *vol_info;
4270
4271 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4272 if (vol_info == NULL)
4273 return ERR_PTR(-ENOMEM);
4274
4275 vol_info->local_nls = cifs_sb->local_nls;
4276 vol_info->linux_uid = fsuid;
4277 vol_info->cred_uid = fsuid;
4278 vol_info->UNC = master_tcon->treeName;
4279 vol_info->retry = master_tcon->retry;
4280 vol_info->nocase = master_tcon->nocase;
4281 vol_info->local_lease = master_tcon->local_lease;
4282 vol_info->no_linux_ext = !master_tcon->unix_ext;
4283 vol_info->sectype = master_tcon->ses->sectype;
4284 vol_info->sign = master_tcon->ses->sign;
4285
4286 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4287 if (rc) {
4288 tcon = ERR_PTR(rc);
4289 goto out;
4290 }
4291
4292 /* get a reference for the same TCP session */
4293 spin_lock(&cifs_tcp_ses_lock);
4294 ++master_tcon->ses->server->srv_count;
4295 spin_unlock(&cifs_tcp_ses_lock);
4296
4297 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4298 if (IS_ERR(ses)) {
4299 tcon = (struct cifs_tcon *)ses;
4300 cifs_put_tcp_session(master_tcon->ses->server, 0);
4301 goto out;
4302 }
4303
4304 tcon = cifs_get_tcon(ses, vol_info);
4305 if (IS_ERR(tcon)) {
4306 cifs_put_smb_ses(ses);
4307 goto out;
4308 }
4309
4310 if (cap_unix(ses))
4311 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4312 out:
4313 kfree(vol_info->username);
4314 kzfree(vol_info->password);
4315 kfree(vol_info);
4316
4317 return tcon;
4318 }
4319
4320 struct cifs_tcon *
4321 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4322 {
4323 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4324 }
4325
4326 /* find and return a tlink with given uid */
4327 static struct tcon_link *
4328 tlink_rb_search(struct rb_root *root, kuid_t uid)
4329 {
4330 struct rb_node *node = root->rb_node;
4331 struct tcon_link *tlink;
4332
4333 while (node) {
4334 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4335
4336 if (uid_gt(tlink->tl_uid, uid))
4337 node = node->rb_left;
4338 else if (uid_lt(tlink->tl_uid, uid))
4339 node = node->rb_right;
4340 else
4341 return tlink;
4342 }
4343 return NULL;
4344 }
4345
4346 /* insert a tcon_link into the tree */
4347 static void
4348 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4349 {
4350 struct rb_node **new = &(root->rb_node), *parent = NULL;
4351 struct tcon_link *tlink;
4352
4353 while (*new) {
4354 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4355 parent = *new;
4356
4357 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4358 new = &((*new)->rb_left);
4359 else
4360 new = &((*new)->rb_right);
4361 }
4362
4363 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4364 rb_insert_color(&new_tlink->tl_rbnode, root);
4365 }
4366
4367 /*
4368 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4369 * current task.
4370 *
4371 * If the superblock doesn't refer to a multiuser mount, then just return
4372 * the master tcon for the mount.
4373 *
4374 * First, search the rbtree for an existing tcon for this fsuid. If one
4375 * exists, then check to see if it's pending construction. If it is then wait
4376 * for construction to complete. Once it's no longer pending, check to see if
4377 * it failed and either return an error or retry construction, depending on
4378 * the timeout.
4379 *
4380 * If one doesn't exist then insert a new tcon_link struct into the tree and
4381 * try to construct a new one.
4382 */
4383 struct tcon_link *
4384 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4385 {
4386 int ret;
4387 kuid_t fsuid = current_fsuid();
4388 struct tcon_link *tlink, *newtlink;
4389
4390 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4391 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4392
4393 spin_lock(&cifs_sb->tlink_tree_lock);
4394 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4395 if (tlink)
4396 cifs_get_tlink(tlink);
4397 spin_unlock(&cifs_sb->tlink_tree_lock);
4398
4399 if (tlink == NULL) {
4400 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4401 if (newtlink == NULL)
4402 return ERR_PTR(-ENOMEM);
4403 newtlink->tl_uid = fsuid;
4404 newtlink->tl_tcon = ERR_PTR(-EACCES);
4405 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4406 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4407 cifs_get_tlink(newtlink);
4408
4409 spin_lock(&cifs_sb->tlink_tree_lock);
4410 /* was one inserted after previous search? */
4411 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4412 if (tlink) {
4413 cifs_get_tlink(tlink);
4414 spin_unlock(&cifs_sb->tlink_tree_lock);
4415 kfree(newtlink);
4416 goto wait_for_construction;
4417 }
4418 tlink = newtlink;
4419 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4420 spin_unlock(&cifs_sb->tlink_tree_lock);
4421 } else {
4422 wait_for_construction:
4423 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4424 TASK_INTERRUPTIBLE);
4425 if (ret) {
4426 cifs_put_tlink(tlink);
4427 return ERR_PTR(-ERESTARTSYS);
4428 }
4429
4430 /* if it's good, return it */
4431 if (!IS_ERR(tlink->tl_tcon))
4432 return tlink;
4433
4434 /* return error if we tried this already recently */
4435 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4436 cifs_put_tlink(tlink);
4437 return ERR_PTR(-EACCES);
4438 }
4439
4440 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4441 goto wait_for_construction;
4442 }
4443
4444 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4445 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4446 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4447
4448 if (IS_ERR(tlink->tl_tcon)) {
4449 cifs_put_tlink(tlink);
4450 return ERR_PTR(-EACCES);
4451 }
4452
4453 return tlink;
4454 }
4455
4456 /*
4457 * periodic workqueue job that scans tcon_tree for a superblock and closes
4458 * out tcons.
4459 */
4460 static void
4461 cifs_prune_tlinks(struct work_struct *work)
4462 {
4463 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4464 prune_tlinks.work);
4465 struct rb_root *root = &cifs_sb->tlink_tree;
4466 struct rb_node *node = rb_first(root);
4467 struct rb_node *tmp;
4468 struct tcon_link *tlink;
4469
4470 /*
4471 * Because we drop the spinlock in the loop in order to put the tlink
4472 * it's not guarded against removal of links from the tree. The only
4473 * places that remove entries from the tree are this function and
4474 * umounts. Because this function is non-reentrant and is canceled
4475 * before umount can proceed, this is safe.
4476 */
4477 spin_lock(&cifs_sb->tlink_tree_lock);
4478 node = rb_first(root);
4479 while (node != NULL) {
4480 tmp = node;
4481 node = rb_next(tmp);
4482 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4483
4484 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4485 atomic_read(&tlink->tl_count) != 0 ||
4486 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4487 continue;
4488
4489 cifs_get_tlink(tlink);
4490 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4491 rb_erase(tmp, root);
4492
4493 spin_unlock(&cifs_sb->tlink_tree_lock);
4494 cifs_put_tlink(tlink);
4495 spin_lock(&cifs_sb->tlink_tree_lock);
4496 }
4497 spin_unlock(&cifs_sb->tlink_tree_lock);
4498
4499 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4500 TLINK_IDLE_EXPIRE);
4501 }
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