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UBUNTU: Ubuntu-4.13.0-45.50
[mirror_ubuntu-artful-kernel.git] / fs / cifs / connect.c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/sched/signal.h>
25 #include <linux/list.h>
26 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/mempool.h>
32 #include <linux/delay.h>
33 #include <linux/completion.h>
34 #include <linux/kthread.h>
35 #include <linux/pagevec.h>
36 #include <linux/freezer.h>
37 #include <linux/namei.h>
38 #include <linux/uuid.h>
39 #include <linux/uaccess.h>
40 #include <asm/processor.h>
41 #include <linux/inet.h>
42 #include <linux/module.h>
43 #include <keys/user-type.h>
44 #include <net/ipv6.h>
45 #include <linux/parser.h>
46 #include <linux/bvec.h>
47
48 #include "cifspdu.h"
49 #include "cifsglob.h"
50 #include "cifsproto.h"
51 #include "cifs_unicode.h"
52 #include "cifs_debug.h"
53 #include "cifs_fs_sb.h"
54 #include "ntlmssp.h"
55 #include "nterr.h"
56 #include "rfc1002pdu.h"
57 #include "fscache.h"
58 #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 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
517 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
518 server->hostname, (2 * server->echo_interval) / HZ);
519 cifs_reconnect(server);
520 wake_up(&server->response_q);
521 return true;
522 }
523
524 return false;
525 }
526
527 static int
528 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
529 {
530 int length = 0;
531 int total_read;
532
533 smb_msg->msg_control = NULL;
534 smb_msg->msg_controllen = 0;
535
536 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
537 try_to_freeze();
538
539 if (server_unresponsive(server))
540 return -ECONNABORTED;
541
542 length = sock_recvmsg(server->ssocket, smb_msg, 0);
543
544 if (server->tcpStatus == CifsExiting)
545 return -ESHUTDOWN;
546
547 if (server->tcpStatus == CifsNeedReconnect) {
548 cifs_reconnect(server);
549 return -ECONNABORTED;
550 }
551
552 if (length == -ERESTARTSYS ||
553 length == -EAGAIN ||
554 length == -EINTR) {
555 /*
556 * Minimum sleep to prevent looping, allowing socket
557 * to clear and app threads to set tcpStatus
558 * CifsNeedReconnect if server hung.
559 */
560 usleep_range(1000, 2000);
561 length = 0;
562 continue;
563 }
564
565 if (length <= 0) {
566 cifs_dbg(FYI, "Received no data or error: %d\n", length);
567 cifs_reconnect(server);
568 return -ECONNABORTED;
569 }
570 }
571 return total_read;
572 }
573
574 int
575 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
576 unsigned int to_read)
577 {
578 struct msghdr smb_msg;
579 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
580 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
581
582 return cifs_readv_from_socket(server, &smb_msg);
583 }
584
585 int
586 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
587 unsigned int to_read)
588 {
589 struct msghdr smb_msg;
590 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
591 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
592 return cifs_readv_from_socket(server, &smb_msg);
593 }
594
595 static bool
596 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
597 {
598 /*
599 * The first byte big endian of the length field,
600 * is actually not part of the length but the type
601 * with the most common, zero, as regular data.
602 */
603 switch (type) {
604 case RFC1002_SESSION_MESSAGE:
605 /* Regular SMB response */
606 return true;
607 case RFC1002_SESSION_KEEP_ALIVE:
608 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
609 break;
610 case RFC1002_POSITIVE_SESSION_RESPONSE:
611 cifs_dbg(FYI, "RFC 1002 positive session response\n");
612 break;
613 case RFC1002_NEGATIVE_SESSION_RESPONSE:
614 /*
615 * We get this from Windows 98 instead of an error on
616 * SMB negprot response.
617 */
618 cifs_dbg(FYI, "RFC 1002 negative session response\n");
619 /* give server a second to clean up */
620 msleep(1000);
621 /*
622 * Always try 445 first on reconnect since we get NACK
623 * on some if we ever connected to port 139 (the NACK
624 * is since we do not begin with RFC1001 session
625 * initialize frame).
626 */
627 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
628 cifs_reconnect(server);
629 wake_up(&server->response_q);
630 break;
631 default:
632 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
633 cifs_reconnect(server);
634 }
635
636 return false;
637 }
638
639 void
640 dequeue_mid(struct mid_q_entry *mid, bool malformed)
641 {
642 #ifdef CONFIG_CIFS_STATS2
643 mid->when_received = jiffies;
644 #endif
645 spin_lock(&GlobalMid_Lock);
646 if (!malformed)
647 mid->mid_state = MID_RESPONSE_RECEIVED;
648 else
649 mid->mid_state = MID_RESPONSE_MALFORMED;
650 list_del_init(&mid->qhead);
651 spin_unlock(&GlobalMid_Lock);
652 }
653
654 static void
655 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
656 char *buf, int malformed)
657 {
658 if (server->ops->check_trans2 &&
659 server->ops->check_trans2(mid, server, buf, malformed))
660 return;
661 mid->resp_buf = buf;
662 mid->large_buf = server->large_buf;
663 /* Was previous buf put in mpx struct for multi-rsp? */
664 if (!mid->multiRsp) {
665 /* smb buffer will be freed by user thread */
666 if (server->large_buf)
667 server->bigbuf = NULL;
668 else
669 server->smallbuf = NULL;
670 }
671 dequeue_mid(mid, malformed);
672 }
673
674 static void clean_demultiplex_info(struct TCP_Server_Info *server)
675 {
676 int length;
677
678 /* take it off the list, if it's not already */
679 spin_lock(&cifs_tcp_ses_lock);
680 list_del_init(&server->tcp_ses_list);
681 spin_unlock(&cifs_tcp_ses_lock);
682
683 spin_lock(&GlobalMid_Lock);
684 server->tcpStatus = CifsExiting;
685 spin_unlock(&GlobalMid_Lock);
686 wake_up_all(&server->response_q);
687
688 /* check if we have blocked requests that need to free */
689 spin_lock(&server->req_lock);
690 if (server->credits <= 0)
691 server->credits = 1;
692 spin_unlock(&server->req_lock);
693 /*
694 * Although there should not be any requests blocked on this queue it
695 * can not hurt to be paranoid and try to wake up requests that may
696 * haven been blocked when more than 50 at time were on the wire to the
697 * same server - they now will see the session is in exit state and get
698 * out of SendReceive.
699 */
700 wake_up_all(&server->request_q);
701 /* give those requests time to exit */
702 msleep(125);
703
704 if (server->ssocket) {
705 sock_release(server->ssocket);
706 server->ssocket = NULL;
707 }
708
709 if (!list_empty(&server->pending_mid_q)) {
710 struct list_head dispose_list;
711 struct mid_q_entry *mid_entry;
712 struct list_head *tmp, *tmp2;
713
714 INIT_LIST_HEAD(&dispose_list);
715 spin_lock(&GlobalMid_Lock);
716 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
717 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
718 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
719 mid_entry->mid_state = MID_SHUTDOWN;
720 list_move(&mid_entry->qhead, &dispose_list);
721 }
722 spin_unlock(&GlobalMid_Lock);
723
724 /* now walk dispose list and issue callbacks */
725 list_for_each_safe(tmp, tmp2, &dispose_list) {
726 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
727 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
728 list_del_init(&mid_entry->qhead);
729 mid_entry->callback(mid_entry);
730 }
731 /* 1/8th of sec is more than enough time for them to exit */
732 msleep(125);
733 }
734
735 if (!list_empty(&server->pending_mid_q)) {
736 /*
737 * mpx threads have not exited yet give them at least the smb
738 * send timeout time for long ops.
739 *
740 * Due to delays on oplock break requests, we need to wait at
741 * least 45 seconds before giving up on a request getting a
742 * response and going ahead and killing cifsd.
743 */
744 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
745 msleep(46000);
746 /*
747 * If threads still have not exited they are probably never
748 * coming home not much else we can do but free the memory.
749 */
750 }
751
752 kfree(server->hostname);
753 kfree(server);
754
755 length = atomic_dec_return(&tcpSesAllocCount);
756 if (length > 0)
757 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
758 }
759
760 static int
761 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
762 {
763 int length;
764 char *buf = server->smallbuf;
765 unsigned int pdu_length = get_rfc1002_length(buf);
766
767 /* make sure this will fit in a large buffer */
768 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
769 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
770 cifs_reconnect(server);
771 wake_up(&server->response_q);
772 return -ECONNABORTED;
773 }
774
775 /* switch to large buffer if too big for a small one */
776 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
777 server->large_buf = true;
778 memcpy(server->bigbuf, buf, server->total_read);
779 buf = server->bigbuf;
780 }
781
782 /* now read the rest */
783 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
784 pdu_length - HEADER_SIZE(server) + 1 + 4);
785 if (length < 0)
786 return length;
787 server->total_read += length;
788
789 dump_smb(buf, server->total_read);
790
791 return cifs_handle_standard(server, mid);
792 }
793
794 int
795 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
796 {
797 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
798 int length;
799
800 /*
801 * We know that we received enough to get to the MID as we
802 * checked the pdu_length earlier. Now check to see
803 * if the rest of the header is OK. We borrow the length
804 * var for the rest of the loop to avoid a new stack var.
805 *
806 * 48 bytes is enough to display the header and a little bit
807 * into the payload for debugging purposes.
808 */
809 length = server->ops->check_message(buf, server->total_read, server);
810 if (length != 0)
811 cifs_dump_mem("Bad SMB: ", buf,
812 min_t(unsigned int, server->total_read, 48));
813
814 if (server->ops->is_session_expired &&
815 server->ops->is_session_expired(buf)) {
816 cifs_reconnect(server);
817 wake_up(&server->response_q);
818 return -1;
819 }
820
821 if (server->ops->is_status_pending &&
822 server->ops->is_status_pending(buf, server, length))
823 return -1;
824
825 if (!mid)
826 return length;
827
828 handle_mid(mid, server, buf, length);
829 return 0;
830 }
831
832 static int
833 cifs_demultiplex_thread(void *p)
834 {
835 int length;
836 struct TCP_Server_Info *server = p;
837 unsigned int pdu_length;
838 char *buf = NULL;
839 struct task_struct *task_to_wake = NULL;
840 struct mid_q_entry *mid_entry;
841
842 current->flags |= PF_MEMALLOC;
843 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
844
845 length = atomic_inc_return(&tcpSesAllocCount);
846 if (length > 1)
847 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
848
849 set_freezable();
850 while (server->tcpStatus != CifsExiting) {
851 if (try_to_freeze())
852 continue;
853
854 if (!allocate_buffers(server))
855 continue;
856
857 server->large_buf = false;
858 buf = server->smallbuf;
859 pdu_length = 4; /* enough to get RFC1001 header */
860
861 length = cifs_read_from_socket(server, buf, pdu_length);
862 if (length < 0)
863 continue;
864 server->total_read = length;
865
866 /*
867 * The right amount was read from socket - 4 bytes,
868 * so we can now interpret the length field.
869 */
870 pdu_length = get_rfc1002_length(buf);
871
872 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
873 if (!is_smb_response(server, buf[0]))
874 continue;
875
876 /* make sure we have enough to get to the MID */
877 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
878 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
879 pdu_length);
880 cifs_reconnect(server);
881 wake_up(&server->response_q);
882 continue;
883 }
884
885 /* read down to the MID */
886 length = cifs_read_from_socket(server, buf + 4,
887 HEADER_SIZE(server) - 1 - 4);
888 if (length < 0)
889 continue;
890 server->total_read += length;
891
892 if (server->ops->is_transform_hdr &&
893 server->ops->receive_transform &&
894 server->ops->is_transform_hdr(buf)) {
895 length = server->ops->receive_transform(server,
896 &mid_entry);
897 } else {
898 mid_entry = server->ops->find_mid(server, buf);
899
900 if (!mid_entry || !mid_entry->receive)
901 length = standard_receive3(server, mid_entry);
902 else
903 length = mid_entry->receive(server, mid_entry);
904 }
905
906 if (length < 0)
907 continue;
908
909 if (server->large_buf)
910 buf = server->bigbuf;
911
912 server->lstrp = jiffies;
913 if (mid_entry != NULL) {
914 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
915 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
916 server->ops->handle_cancelled_mid)
917 server->ops->handle_cancelled_mid(
918 mid_entry->resp_buf,
919 server);
920
921 if (!mid_entry->multiRsp || mid_entry->multiEnd)
922 mid_entry->callback(mid_entry);
923 } else if (server->ops->is_oplock_break &&
924 server->ops->is_oplock_break(buf, server)) {
925 cifs_dbg(FYI, "Received oplock break\n");
926 } else {
927 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
928 atomic_read(&midCount));
929 cifs_dump_mem("Received Data is: ", buf,
930 HEADER_SIZE(server));
931 #ifdef CONFIG_CIFS_DEBUG2
932 if (server->ops->dump_detail)
933 server->ops->dump_detail(buf);
934 cifs_dump_mids(server);
935 #endif /* CIFS_DEBUG2 */
936
937 }
938 } /* end while !EXITING */
939
940 /* buffer usually freed in free_mid - need to free it here on exit */
941 cifs_buf_release(server->bigbuf);
942 if (server->smallbuf) /* no sense logging a debug message if NULL */
943 cifs_small_buf_release(server->smallbuf);
944
945 task_to_wake = xchg(&server->tsk, NULL);
946 clean_demultiplex_info(server);
947
948 /* if server->tsk was NULL then wait for a signal before exiting */
949 if (!task_to_wake) {
950 set_current_state(TASK_INTERRUPTIBLE);
951 while (!signal_pending(current)) {
952 schedule();
953 set_current_state(TASK_INTERRUPTIBLE);
954 }
955 set_current_state(TASK_RUNNING);
956 }
957
958 module_put_and_exit(0);
959 }
960
961 /* extract the host portion of the UNC string */
962 static char *
963 extract_hostname(const char *unc)
964 {
965 const char *src;
966 char *dst, *delim;
967 unsigned int len;
968
969 /* skip double chars at beginning of string */
970 /* BB: check validity of these bytes? */
971 src = unc + 2;
972
973 /* delimiter between hostname and sharename is always '\\' now */
974 delim = strchr(src, '\\');
975 if (!delim)
976 return ERR_PTR(-EINVAL);
977
978 len = delim - src;
979 dst = kmalloc((len + 1), GFP_KERNEL);
980 if (dst == NULL)
981 return ERR_PTR(-ENOMEM);
982
983 memcpy(dst, src, len);
984 dst[len] = '\0';
985
986 return dst;
987 }
988
989 static int get_option_ul(substring_t args[], unsigned long *option)
990 {
991 int rc;
992 char *string;
993
994 string = match_strdup(args);
995 if (string == NULL)
996 return -ENOMEM;
997 rc = kstrtoul(string, 0, option);
998 kfree(string);
999
1000 return rc;
1001 }
1002
1003 static int get_option_uid(substring_t args[], kuid_t *result)
1004 {
1005 unsigned long value;
1006 kuid_t uid;
1007 int rc;
1008
1009 rc = get_option_ul(args, &value);
1010 if (rc)
1011 return rc;
1012
1013 uid = make_kuid(current_user_ns(), value);
1014 if (!uid_valid(uid))
1015 return -EINVAL;
1016
1017 *result = uid;
1018 return 0;
1019 }
1020
1021 static int get_option_gid(substring_t args[], kgid_t *result)
1022 {
1023 unsigned long value;
1024 kgid_t gid;
1025 int rc;
1026
1027 rc = get_option_ul(args, &value);
1028 if (rc)
1029 return rc;
1030
1031 gid = make_kgid(current_user_ns(), value);
1032 if (!gid_valid(gid))
1033 return -EINVAL;
1034
1035 *result = gid;
1036 return 0;
1037 }
1038
1039 static int cifs_parse_security_flavors(char *value,
1040 struct smb_vol *vol)
1041 {
1042
1043 substring_t args[MAX_OPT_ARGS];
1044
1045 /*
1046 * With mount options, the last one should win. Reset any existing
1047 * settings back to default.
1048 */
1049 vol->sectype = Unspecified;
1050 vol->sign = false;
1051
1052 switch (match_token(value, cifs_secflavor_tokens, args)) {
1053 case Opt_sec_krb5p:
1054 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1055 return 1;
1056 case Opt_sec_krb5i:
1057 vol->sign = true;
1058 /* Fallthrough */
1059 case Opt_sec_krb5:
1060 vol->sectype = Kerberos;
1061 break;
1062 case Opt_sec_ntlmsspi:
1063 vol->sign = true;
1064 /* Fallthrough */
1065 case Opt_sec_ntlmssp:
1066 vol->sectype = RawNTLMSSP;
1067 break;
1068 case Opt_sec_ntlmi:
1069 vol->sign = true;
1070 /* Fallthrough */
1071 case Opt_ntlm:
1072 vol->sectype = NTLM;
1073 break;
1074 case Opt_sec_ntlmv2i:
1075 vol->sign = true;
1076 /* Fallthrough */
1077 case Opt_sec_ntlmv2:
1078 vol->sectype = NTLMv2;
1079 break;
1080 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1081 case Opt_sec_lanman:
1082 vol->sectype = LANMAN;
1083 break;
1084 #endif
1085 case Opt_sec_none:
1086 vol->nullauth = 1;
1087 break;
1088 default:
1089 cifs_dbg(VFS, "bad security option: %s\n", value);
1090 return 1;
1091 }
1092
1093 return 0;
1094 }
1095
1096 static int
1097 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1098 {
1099 substring_t args[MAX_OPT_ARGS];
1100
1101 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1102 case Opt_cache_loose:
1103 vol->direct_io = false;
1104 vol->strict_io = false;
1105 break;
1106 case Opt_cache_strict:
1107 vol->direct_io = false;
1108 vol->strict_io = true;
1109 break;
1110 case Opt_cache_none:
1111 vol->direct_io = true;
1112 vol->strict_io = false;
1113 break;
1114 default:
1115 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1116 return 1;
1117 }
1118 return 0;
1119 }
1120
1121 static int
1122 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1123 {
1124 substring_t args[MAX_OPT_ARGS];
1125
1126 switch (match_token(value, cifs_smb_version_tokens, args)) {
1127 case Smb_1:
1128 vol->ops = &smb1_operations;
1129 vol->vals = &smb1_values;
1130 break;
1131 case Smb_20:
1132 vol->ops = &smb20_operations;
1133 vol->vals = &smb20_values;
1134 break;
1135 case Smb_21:
1136 vol->ops = &smb21_operations;
1137 vol->vals = &smb21_values;
1138 break;
1139 case Smb_30:
1140 vol->ops = &smb30_operations;
1141 vol->vals = &smb30_values;
1142 break;
1143 case Smb_302:
1144 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1145 vol->vals = &smb302_values;
1146 break;
1147 #ifdef CONFIG_CIFS_SMB311
1148 case Smb_311:
1149 vol->ops = &smb311_operations;
1150 vol->vals = &smb311_values;
1151 break;
1152 #endif /* SMB311 */
1153 case Smb_3any:
1154 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1155 vol->vals = &smb3any_values;
1156 break;
1157 case Smb_default:
1158 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1159 vol->vals = &smbdefault_values;
1160 break;
1161 default:
1162 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1163 return 1;
1164 }
1165 return 0;
1166 }
1167
1168 /*
1169 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1170 * fields with the result. Returns 0 on success and an error otherwise.
1171 */
1172 static int
1173 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1174 {
1175 char *pos;
1176 const char *delims = "/\\";
1177 size_t len;
1178
1179 /* make sure we have a valid UNC double delimiter prefix */
1180 len = strspn(devname, delims);
1181 if (len != 2)
1182 return -EINVAL;
1183
1184 /* find delimiter between host and sharename */
1185 pos = strpbrk(devname + 2, delims);
1186 if (!pos)
1187 return -EINVAL;
1188
1189 /* skip past delimiter */
1190 ++pos;
1191
1192 /* now go until next delimiter or end of string */
1193 len = strcspn(pos, delims);
1194
1195 /* move "pos" up to delimiter or NULL */
1196 pos += len;
1197 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1198 if (!vol->UNC)
1199 return -ENOMEM;
1200
1201 convert_delimiter(vol->UNC, '\\');
1202
1203 /* skip any delimiter */
1204 if (*pos == '/' || *pos == '\\')
1205 pos++;
1206
1207 /* If pos is NULL then no prepath */
1208 if (!*pos)
1209 return 0;
1210
1211 vol->prepath = kstrdup(pos, GFP_KERNEL);
1212 if (!vol->prepath)
1213 return -ENOMEM;
1214
1215 return 0;
1216 }
1217
1218 static int
1219 cifs_parse_mount_options(const char *mountdata, const char *devname,
1220 struct smb_vol *vol)
1221 {
1222 char *data, *end;
1223 char *mountdata_copy = NULL, *options;
1224 unsigned int temp_len, i, j;
1225 char separator[2];
1226 short int override_uid = -1;
1227 short int override_gid = -1;
1228 bool uid_specified = false;
1229 bool gid_specified = false;
1230 bool sloppy = false;
1231 char *invalid = NULL;
1232 char *nodename = utsname()->nodename;
1233 char *string = NULL;
1234 char *tmp_end, *value;
1235 char delim;
1236 bool got_ip = false;
1237 bool got_version = false;
1238 unsigned short port = 0;
1239 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1240
1241 separator[0] = ',';
1242 separator[1] = 0;
1243 delim = separator[0];
1244
1245 /* ensure we always start with zeroed-out smb_vol */
1246 memset(vol, 0, sizeof(*vol));
1247
1248 /*
1249 * does not have to be perfect mapping since field is
1250 * informational, only used for servers that do not support
1251 * port 445 and it can be overridden at mount time
1252 */
1253 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1254 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1255 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1256
1257 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1258 /* null target name indicates to use *SMBSERVR default called name
1259 if we end up sending RFC1001 session initialize */
1260 vol->target_rfc1001_name[0] = 0;
1261 vol->cred_uid = current_uid();
1262 vol->linux_uid = current_uid();
1263 vol->linux_gid = current_gid();
1264
1265 /*
1266 * default to SFM style remapping of seven reserved characters
1267 * unless user overrides it or we negotiate CIFS POSIX where
1268 * it is unnecessary. Can not simultaneously use more than one mapping
1269 * since then readdir could list files that open could not open
1270 */
1271 vol->remap = true;
1272
1273 /* default to only allowing write access to owner of the mount */
1274 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1275
1276 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1277 /* default is always to request posix paths. */
1278 vol->posix_paths = 1;
1279 /* default to using server inode numbers where available */
1280 vol->server_ino = 1;
1281
1282 /* default is to use strict cifs caching semantics */
1283 vol->strict_io = true;
1284
1285 vol->actimeo = CIFS_DEF_ACTIMEO;
1286
1287 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1288 vol->ops = &smb30_operations;
1289 vol->vals = &smbdefault_values;
1290
1291 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1292
1293 if (!mountdata)
1294 goto cifs_parse_mount_err;
1295
1296 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1297 if (!mountdata_copy)
1298 goto cifs_parse_mount_err;
1299
1300 options = mountdata_copy;
1301 end = options + strlen(options);
1302
1303 if (strncmp(options, "sep=", 4) == 0) {
1304 if (options[4] != 0) {
1305 separator[0] = options[4];
1306 options += 5;
1307 } else {
1308 cifs_dbg(FYI, "Null separator not allowed\n");
1309 }
1310 }
1311 vol->backupuid_specified = false; /* no backup intent for a user */
1312 vol->backupgid_specified = false; /* no backup intent for a group */
1313
1314 switch (cifs_parse_devname(devname, vol)) {
1315 case 0:
1316 break;
1317 case -ENOMEM:
1318 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1319 goto cifs_parse_mount_err;
1320 case -EINVAL:
1321 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1322 goto cifs_parse_mount_err;
1323 default:
1324 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1325 goto cifs_parse_mount_err;
1326 }
1327
1328 while ((data = strsep(&options, separator)) != NULL) {
1329 substring_t args[MAX_OPT_ARGS];
1330 unsigned long option;
1331 int token;
1332
1333 if (!*data)
1334 continue;
1335
1336 token = match_token(data, cifs_mount_option_tokens, args);
1337
1338 switch (token) {
1339
1340 /* Ingnore the following */
1341 case Opt_ignore:
1342 break;
1343
1344 /* Boolean values */
1345 case Opt_user_xattr:
1346 vol->no_xattr = 0;
1347 break;
1348 case Opt_nouser_xattr:
1349 vol->no_xattr = 1;
1350 break;
1351 case Opt_forceuid:
1352 override_uid = 1;
1353 break;
1354 case Opt_noforceuid:
1355 override_uid = 0;
1356 break;
1357 case Opt_forcegid:
1358 override_gid = 1;
1359 break;
1360 case Opt_noforcegid:
1361 override_gid = 0;
1362 break;
1363 case Opt_noblocksend:
1364 vol->noblocksnd = 1;
1365 break;
1366 case Opt_noautotune:
1367 vol->noautotune = 1;
1368 break;
1369 case Opt_hard:
1370 vol->retry = 1;
1371 break;
1372 case Opt_soft:
1373 vol->retry = 0;
1374 break;
1375 case Opt_perm:
1376 vol->noperm = 0;
1377 break;
1378 case Opt_noperm:
1379 vol->noperm = 1;
1380 break;
1381 case Opt_mapchars:
1382 vol->sfu_remap = true;
1383 vol->remap = false; /* disable SFM mapping */
1384 break;
1385 case Opt_nomapchars:
1386 vol->sfu_remap = false;
1387 break;
1388 case Opt_mapposix:
1389 vol->remap = true;
1390 vol->sfu_remap = false; /* disable SFU mapping */
1391 break;
1392 case Opt_nomapposix:
1393 vol->remap = false;
1394 break;
1395 case Opt_sfu:
1396 vol->sfu_emul = 1;
1397 break;
1398 case Opt_nosfu:
1399 vol->sfu_emul = 0;
1400 break;
1401 case Opt_nodfs:
1402 vol->nodfs = 1;
1403 break;
1404 case Opt_posixpaths:
1405 vol->posix_paths = 1;
1406 break;
1407 case Opt_noposixpaths:
1408 vol->posix_paths = 0;
1409 break;
1410 case Opt_nounix:
1411 vol->no_linux_ext = 1;
1412 break;
1413 case Opt_nocase:
1414 vol->nocase = 1;
1415 break;
1416 case Opt_brl:
1417 vol->nobrl = 0;
1418 break;
1419 case Opt_nobrl:
1420 vol->nobrl = 1;
1421 /*
1422 * turn off mandatory locking in mode
1423 * if remote locking is turned off since the
1424 * local vfs will do advisory
1425 */
1426 if (vol->file_mode ==
1427 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1428 vol->file_mode = S_IALLUGO;
1429 break;
1430 case Opt_forcemandatorylock:
1431 vol->mand_lock = 1;
1432 break;
1433 case Opt_setuids:
1434 vol->setuids = 1;
1435 break;
1436 case Opt_nosetuids:
1437 vol->setuids = 0;
1438 break;
1439 case Opt_setuidfromacl:
1440 vol->setuidfromacl = 1;
1441 break;
1442 case Opt_dynperm:
1443 vol->dynperm = true;
1444 break;
1445 case Opt_nodynperm:
1446 vol->dynperm = false;
1447 break;
1448 case Opt_nohard:
1449 vol->retry = 0;
1450 break;
1451 case Opt_nosoft:
1452 vol->retry = 1;
1453 break;
1454 case Opt_nointr:
1455 vol->intr = 0;
1456 break;
1457 case Opt_intr:
1458 vol->intr = 1;
1459 break;
1460 case Opt_nostrictsync:
1461 vol->nostrictsync = 1;
1462 break;
1463 case Opt_strictsync:
1464 vol->nostrictsync = 0;
1465 break;
1466 case Opt_serverino:
1467 vol->server_ino = 1;
1468 break;
1469 case Opt_noserverino:
1470 vol->server_ino = 0;
1471 break;
1472 case Opt_rwpidforward:
1473 vol->rwpidforward = 1;
1474 break;
1475 case Opt_cifsacl:
1476 vol->cifs_acl = 1;
1477 break;
1478 case Opt_nocifsacl:
1479 vol->cifs_acl = 0;
1480 break;
1481 case Opt_acl:
1482 vol->no_psx_acl = 0;
1483 break;
1484 case Opt_noacl:
1485 vol->no_psx_acl = 1;
1486 break;
1487 case Opt_locallease:
1488 vol->local_lease = 1;
1489 break;
1490 case Opt_sign:
1491 vol->sign = true;
1492 break;
1493 case Opt_seal:
1494 /* we do not do the following in secFlags because seal
1495 * is a per tree connection (mount) not a per socket
1496 * or per-smb connection option in the protocol
1497 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1498 */
1499 vol->seal = 1;
1500 break;
1501 case Opt_noac:
1502 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1503 break;
1504 case Opt_fsc:
1505 #ifndef CONFIG_CIFS_FSCACHE
1506 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1507 goto cifs_parse_mount_err;
1508 #endif
1509 vol->fsc = true;
1510 break;
1511 case Opt_mfsymlinks:
1512 vol->mfsymlinks = true;
1513 break;
1514 case Opt_multiuser:
1515 vol->multiuser = true;
1516 break;
1517 case Opt_sloppy:
1518 sloppy = true;
1519 break;
1520 case Opt_nosharesock:
1521 vol->nosharesock = true;
1522 break;
1523 case Opt_nopersistent:
1524 vol->nopersistent = true;
1525 if (vol->persistent) {
1526 cifs_dbg(VFS,
1527 "persistenthandles mount options conflict\n");
1528 goto cifs_parse_mount_err;
1529 }
1530 break;
1531 case Opt_persistent:
1532 vol->persistent = true;
1533 if ((vol->nopersistent) || (vol->resilient)) {
1534 cifs_dbg(VFS,
1535 "persistenthandles mount options conflict\n");
1536 goto cifs_parse_mount_err;
1537 }
1538 break;
1539 case Opt_resilient:
1540 vol->resilient = true;
1541 if (vol->persistent) {
1542 cifs_dbg(VFS,
1543 "persistenthandles mount options conflict\n");
1544 goto cifs_parse_mount_err;
1545 }
1546 break;
1547 case Opt_noresilient:
1548 vol->resilient = false; /* already the default */
1549 break;
1550 case Opt_domainauto:
1551 vol->domainauto = true;
1552 break;
1553
1554 /* Numeric Values */
1555 case Opt_backupuid:
1556 if (get_option_uid(args, &vol->backupuid)) {
1557 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1558 __func__);
1559 goto cifs_parse_mount_err;
1560 }
1561 vol->backupuid_specified = true;
1562 break;
1563 case Opt_backupgid:
1564 if (get_option_gid(args, &vol->backupgid)) {
1565 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1566 __func__);
1567 goto cifs_parse_mount_err;
1568 }
1569 vol->backupgid_specified = true;
1570 break;
1571 case Opt_uid:
1572 if (get_option_uid(args, &vol->linux_uid)) {
1573 cifs_dbg(VFS, "%s: Invalid uid value\n",
1574 __func__);
1575 goto cifs_parse_mount_err;
1576 }
1577 uid_specified = true;
1578 break;
1579 case Opt_cruid:
1580 if (get_option_uid(args, &vol->cred_uid)) {
1581 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1582 __func__);
1583 goto cifs_parse_mount_err;
1584 }
1585 break;
1586 case Opt_gid:
1587 if (get_option_gid(args, &vol->linux_gid)) {
1588 cifs_dbg(VFS, "%s: Invalid gid value\n",
1589 __func__);
1590 goto cifs_parse_mount_err;
1591 }
1592 gid_specified = true;
1593 break;
1594 case Opt_file_mode:
1595 if (get_option_ul(args, &option)) {
1596 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1597 __func__);
1598 goto cifs_parse_mount_err;
1599 }
1600 vol->file_mode = option;
1601 break;
1602 case Opt_dirmode:
1603 if (get_option_ul(args, &option)) {
1604 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1605 __func__);
1606 goto cifs_parse_mount_err;
1607 }
1608 vol->dir_mode = option;
1609 break;
1610 case Opt_port:
1611 if (get_option_ul(args, &option) ||
1612 option > USHRT_MAX) {
1613 cifs_dbg(VFS, "%s: Invalid port value\n",
1614 __func__);
1615 goto cifs_parse_mount_err;
1616 }
1617 port = (unsigned short)option;
1618 break;
1619 case Opt_rsize:
1620 if (get_option_ul(args, &option)) {
1621 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1622 __func__);
1623 goto cifs_parse_mount_err;
1624 }
1625 vol->rsize = option;
1626 break;
1627 case Opt_wsize:
1628 if (get_option_ul(args, &option)) {
1629 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1630 __func__);
1631 goto cifs_parse_mount_err;
1632 }
1633 vol->wsize = option;
1634 break;
1635 case Opt_actimeo:
1636 if (get_option_ul(args, &option)) {
1637 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1638 __func__);
1639 goto cifs_parse_mount_err;
1640 }
1641 vol->actimeo = HZ * option;
1642 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1643 cifs_dbg(VFS, "attribute cache timeout too large\n");
1644 goto cifs_parse_mount_err;
1645 }
1646 break;
1647 case Opt_echo_interval:
1648 if (get_option_ul(args, &option)) {
1649 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1650 __func__);
1651 goto cifs_parse_mount_err;
1652 }
1653 vol->echo_interval = option;
1654 break;
1655 case Opt_snapshot:
1656 if (get_option_ul(args, &option)) {
1657 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1658 __func__);
1659 goto cifs_parse_mount_err;
1660 }
1661 vol->snapshot_time = option;
1662 break;
1663 case Opt_max_credits:
1664 if (get_option_ul(args, &option) || (option < 20) ||
1665 (option > 60000)) {
1666 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1667 __func__);
1668 goto cifs_parse_mount_err;
1669 }
1670 vol->max_credits = option;
1671 break;
1672
1673 /* String Arguments */
1674
1675 case Opt_blank_user:
1676 /* null user, ie. anonymous authentication */
1677 vol->nullauth = 1;
1678 vol->username = NULL;
1679 break;
1680 case Opt_user:
1681 string = match_strdup(args);
1682 if (string == NULL)
1683 goto out_nomem;
1684
1685 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1686 CIFS_MAX_USERNAME_LEN) {
1687 pr_warn("CIFS: username too long\n");
1688 goto cifs_parse_mount_err;
1689 }
1690
1691 kfree(vol->username);
1692 vol->username = kstrdup(string, GFP_KERNEL);
1693 if (!vol->username)
1694 goto cifs_parse_mount_err;
1695 break;
1696 case Opt_blank_pass:
1697 /* passwords have to be handled differently
1698 * to allow the character used for deliminator
1699 * to be passed within them
1700 */
1701
1702 /*
1703 * Check if this is a case where the password
1704 * starts with a delimiter
1705 */
1706 tmp_end = strchr(data, '=');
1707 tmp_end++;
1708 if (!(tmp_end < end && tmp_end[1] == delim)) {
1709 /* No it is not. Set the password to NULL */
1710 kfree(vol->password);
1711 vol->password = NULL;
1712 break;
1713 }
1714 /* Yes it is. Drop down to Opt_pass below.*/
1715 case Opt_pass:
1716 /* Obtain the value string */
1717 value = strchr(data, '=');
1718 value++;
1719
1720 /* Set tmp_end to end of the string */
1721 tmp_end = (char *) value + strlen(value);
1722
1723 /* Check if following character is the deliminator
1724 * If yes, we have encountered a double deliminator
1725 * reset the NULL character to the deliminator
1726 */
1727 if (tmp_end < end && tmp_end[1] == delim) {
1728 tmp_end[0] = delim;
1729
1730 /* Keep iterating until we get to a single
1731 * deliminator OR the end
1732 */
1733 while ((tmp_end = strchr(tmp_end, delim))
1734 != NULL && (tmp_end[1] == delim)) {
1735 tmp_end = (char *) &tmp_end[2];
1736 }
1737
1738 /* Reset var options to point to next element */
1739 if (tmp_end) {
1740 tmp_end[0] = '\0';
1741 options = (char *) &tmp_end[1];
1742 } else
1743 /* Reached the end of the mount option
1744 * string */
1745 options = end;
1746 }
1747
1748 kfree(vol->password);
1749 /* Now build new password string */
1750 temp_len = strlen(value);
1751 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1752 if (vol->password == NULL) {
1753 pr_warn("CIFS: no memory for password\n");
1754 goto cifs_parse_mount_err;
1755 }
1756
1757 for (i = 0, j = 0; i < temp_len; i++, j++) {
1758 vol->password[j] = value[i];
1759 if ((value[i] == delim) &&
1760 value[i+1] == delim)
1761 /* skip the second deliminator */
1762 i++;
1763 }
1764 vol->password[j] = '\0';
1765 break;
1766 case Opt_blank_ip:
1767 /* FIXME: should this be an error instead? */
1768 got_ip = false;
1769 break;
1770 case Opt_ip:
1771 string = match_strdup(args);
1772 if (string == NULL)
1773 goto out_nomem;
1774
1775 if (!cifs_convert_address(dstaddr, string,
1776 strlen(string))) {
1777 pr_err("CIFS: bad ip= option (%s).\n", string);
1778 goto cifs_parse_mount_err;
1779 }
1780 got_ip = true;
1781 break;
1782 case Opt_domain:
1783 string = match_strdup(args);
1784 if (string == NULL)
1785 goto out_nomem;
1786
1787 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1788 == CIFS_MAX_DOMAINNAME_LEN) {
1789 pr_warn("CIFS: domain name too long\n");
1790 goto cifs_parse_mount_err;
1791 }
1792
1793 kfree(vol->domainname);
1794 vol->domainname = kstrdup(string, GFP_KERNEL);
1795 if (!vol->domainname) {
1796 pr_warn("CIFS: no memory for domainname\n");
1797 goto cifs_parse_mount_err;
1798 }
1799 cifs_dbg(FYI, "Domain name set\n");
1800 break;
1801 case Opt_srcaddr:
1802 string = match_strdup(args);
1803 if (string == NULL)
1804 goto out_nomem;
1805
1806 if (!cifs_convert_address(
1807 (struct sockaddr *)&vol->srcaddr,
1808 string, strlen(string))) {
1809 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1810 string);
1811 goto cifs_parse_mount_err;
1812 }
1813 break;
1814 case Opt_iocharset:
1815 string = match_strdup(args);
1816 if (string == NULL)
1817 goto out_nomem;
1818
1819 if (strnlen(string, 1024) >= 65) {
1820 pr_warn("CIFS: iocharset name too long.\n");
1821 goto cifs_parse_mount_err;
1822 }
1823
1824 if (strncasecmp(string, "default", 7) != 0) {
1825 kfree(vol->iocharset);
1826 vol->iocharset = kstrdup(string,
1827 GFP_KERNEL);
1828 if (!vol->iocharset) {
1829 pr_warn("CIFS: no memory for charset\n");
1830 goto cifs_parse_mount_err;
1831 }
1832 }
1833 /* if iocharset not set then load_nls_default
1834 * is used by caller
1835 */
1836 cifs_dbg(FYI, "iocharset set to %s\n", string);
1837 break;
1838 case Opt_netbiosname:
1839 string = match_strdup(args);
1840 if (string == NULL)
1841 goto out_nomem;
1842
1843 memset(vol->source_rfc1001_name, 0x20,
1844 RFC1001_NAME_LEN);
1845 /*
1846 * FIXME: are there cases in which a comma can
1847 * be valid in workstation netbios name (and
1848 * need special handling)?
1849 */
1850 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1851 /* don't ucase netbiosname for user */
1852 if (string[i] == 0)
1853 break;
1854 vol->source_rfc1001_name[i] = string[i];
1855 }
1856 /* The string has 16th byte zero still from
1857 * set at top of the function
1858 */
1859 if (i == RFC1001_NAME_LEN && string[i] != 0)
1860 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1861 break;
1862 case Opt_servern:
1863 /* servernetbiosname specified override *SMBSERVER */
1864 string = match_strdup(args);
1865 if (string == NULL)
1866 goto out_nomem;
1867
1868 /* last byte, type, is 0x20 for servr type */
1869 memset(vol->target_rfc1001_name, 0x20,
1870 RFC1001_NAME_LEN_WITH_NULL);
1871
1872 /* BB are there cases in which a comma can be
1873 valid in this workstation netbios name
1874 (and need special handling)? */
1875
1876 /* user or mount helper must uppercase the
1877 netbios name */
1878 for (i = 0; i < 15; i++) {
1879 if (string[i] == 0)
1880 break;
1881 vol->target_rfc1001_name[i] = string[i];
1882 }
1883 /* The string has 16th byte zero still from
1884 set at top of the function */
1885 if (i == RFC1001_NAME_LEN && string[i] != 0)
1886 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1887 break;
1888 case Opt_ver:
1889 /* version of mount userspace tools, not dialect */
1890 string = match_strdup(args);
1891 if (string == NULL)
1892 goto out_nomem;
1893
1894 /* If interface changes in mount.cifs bump to new ver */
1895 if (strncasecmp(string, "1", 1) == 0) {
1896 if (strlen(string) > 1) {
1897 pr_warn("Bad mount helper ver=%s. Did "
1898 "you want SMB1 (CIFS) dialect "
1899 "and mean to type vers=1.0 "
1900 "instead?\n", string);
1901 goto cifs_parse_mount_err;
1902 }
1903 /* This is the default */
1904 break;
1905 }
1906 /* For all other value, error */
1907 pr_warn("CIFS: Invalid mount helper version specified\n");
1908 goto cifs_parse_mount_err;
1909 case Opt_vers:
1910 /* protocol version (dialect) */
1911 string = match_strdup(args);
1912 if (string == NULL)
1913 goto out_nomem;
1914
1915 if (cifs_parse_smb_version(string, vol) != 0)
1916 goto cifs_parse_mount_err;
1917 got_version = true;
1918 break;
1919 case Opt_sec:
1920 string = match_strdup(args);
1921 if (string == NULL)
1922 goto out_nomem;
1923
1924 if (cifs_parse_security_flavors(string, vol) != 0)
1925 goto cifs_parse_mount_err;
1926 break;
1927 case Opt_cache:
1928 string = match_strdup(args);
1929 if (string == NULL)
1930 goto out_nomem;
1931
1932 if (cifs_parse_cache_flavor(string, vol) != 0)
1933 goto cifs_parse_mount_err;
1934 break;
1935 default:
1936 /*
1937 * An option we don't recognize. Save it off for later
1938 * if we haven't already found one
1939 */
1940 if (!invalid)
1941 invalid = data;
1942 break;
1943 }
1944 /* Free up any allocated string */
1945 kfree(string);
1946 string = NULL;
1947 }
1948
1949 if (!sloppy && invalid) {
1950 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1951 goto cifs_parse_mount_err;
1952 }
1953
1954 #ifndef CONFIG_KEYS
1955 /* Muliuser mounts require CONFIG_KEYS support */
1956 if (vol->multiuser) {
1957 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1958 goto cifs_parse_mount_err;
1959 }
1960 #endif
1961 if (!vol->UNC) {
1962 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1963 goto cifs_parse_mount_err;
1964 }
1965
1966 /* make sure UNC has a share name */
1967 if (!strchr(vol->UNC + 3, '\\')) {
1968 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1969 goto cifs_parse_mount_err;
1970 }
1971
1972 if (!got_ip) {
1973 int len;
1974 const char *slash;
1975
1976 /* No ip= option specified? Try to get it from UNC */
1977 /* Use the address part of the UNC. */
1978 slash = strchr(&vol->UNC[2], '\\');
1979 len = slash - &vol->UNC[2];
1980 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
1981 pr_err("Unable to determine destination address.\n");
1982 goto cifs_parse_mount_err;
1983 }
1984 }
1985
1986 /* set the port that we got earlier */
1987 cifs_set_port(dstaddr, port);
1988
1989 if (uid_specified)
1990 vol->override_uid = override_uid;
1991 else if (override_uid == 1)
1992 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1993
1994 if (gid_specified)
1995 vol->override_gid = override_gid;
1996 else if (override_gid == 1)
1997 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1998
1999 if (got_version == false)
2000 pr_warn("No dialect specified on mount. Default has changed to "
2001 "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
2002 "(SMB1). To use the less secure SMB1 dialect to access "
2003 "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
2004 " on mount.\n");
2005
2006 kfree(mountdata_copy);
2007 return 0;
2008
2009 out_nomem:
2010 pr_warn("Could not allocate temporary buffer\n");
2011 cifs_parse_mount_err:
2012 kfree(string);
2013 kfree(mountdata_copy);
2014 return 1;
2015 }
2016
2017 /** Returns true if srcaddr isn't specified and rhs isn't
2018 * specified, or if srcaddr is specified and
2019 * matches the IP address of the rhs argument.
2020 */
2021 static bool
2022 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2023 {
2024 switch (srcaddr->sa_family) {
2025 case AF_UNSPEC:
2026 return (rhs->sa_family == AF_UNSPEC);
2027 case AF_INET: {
2028 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2029 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2030 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2031 }
2032 case AF_INET6: {
2033 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2034 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2035 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2036 }
2037 default:
2038 WARN_ON(1);
2039 return false; /* don't expect to be here */
2040 }
2041 }
2042
2043 /*
2044 * If no port is specified in addr structure, we try to match with 445 port
2045 * and if it fails - with 139 ports. It should be called only if address
2046 * families of server and addr are equal.
2047 */
2048 static bool
2049 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2050 {
2051 __be16 port, *sport;
2052
2053 switch (addr->sa_family) {
2054 case AF_INET:
2055 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2056 port = ((struct sockaddr_in *) addr)->sin_port;
2057 break;
2058 case AF_INET6:
2059 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2060 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2061 break;
2062 default:
2063 WARN_ON(1);
2064 return false;
2065 }
2066
2067 if (!port) {
2068 port = htons(CIFS_PORT);
2069 if (port == *sport)
2070 return true;
2071
2072 port = htons(RFC1001_PORT);
2073 }
2074
2075 return port == *sport;
2076 }
2077
2078 static bool
2079 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2080 struct sockaddr *srcaddr)
2081 {
2082 switch (addr->sa_family) {
2083 case AF_INET: {
2084 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2085 struct sockaddr_in *srv_addr4 =
2086 (struct sockaddr_in *)&server->dstaddr;
2087
2088 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2089 return false;
2090 break;
2091 }
2092 case AF_INET6: {
2093 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2094 struct sockaddr_in6 *srv_addr6 =
2095 (struct sockaddr_in6 *)&server->dstaddr;
2096
2097 if (!ipv6_addr_equal(&addr6->sin6_addr,
2098 &srv_addr6->sin6_addr))
2099 return false;
2100 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2101 return false;
2102 break;
2103 }
2104 default:
2105 WARN_ON(1);
2106 return false; /* don't expect to be here */
2107 }
2108
2109 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2110 return false;
2111
2112 return true;
2113 }
2114
2115 static bool
2116 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2117 {
2118 /*
2119 * The select_sectype function should either return the vol->sectype
2120 * that was specified, or "Unspecified" if that sectype was not
2121 * compatible with the given NEGOTIATE request.
2122 */
2123 if (server->ops->select_sectype(server, vol->sectype)
2124 == Unspecified)
2125 return false;
2126
2127 /*
2128 * Now check if signing mode is acceptable. No need to check
2129 * global_secflags at this point since if MUST_SIGN is set then
2130 * the server->sign had better be too.
2131 */
2132 if (vol->sign && !server->sign)
2133 return false;
2134
2135 return true;
2136 }
2137
2138 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2139 {
2140 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2141
2142 if (vol->nosharesock)
2143 return 0;
2144
2145 /* BB update this for smb3any and default case */
2146 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2147 return 0;
2148
2149 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2150 return 0;
2151
2152 if (!match_address(server, addr,
2153 (struct sockaddr *)&vol->srcaddr))
2154 return 0;
2155
2156 if (!match_port(server, addr))
2157 return 0;
2158
2159 if (!match_security(server, vol))
2160 return 0;
2161
2162 if (server->echo_interval != vol->echo_interval * HZ)
2163 return 0;
2164
2165 return 1;
2166 }
2167
2168 static struct TCP_Server_Info *
2169 cifs_find_tcp_session(struct smb_vol *vol)
2170 {
2171 struct TCP_Server_Info *server;
2172
2173 spin_lock(&cifs_tcp_ses_lock);
2174 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2175 if (!match_server(server, vol))
2176 continue;
2177
2178 ++server->srv_count;
2179 spin_unlock(&cifs_tcp_ses_lock);
2180 cifs_dbg(FYI, "Existing tcp session with server found\n");
2181 return server;
2182 }
2183 spin_unlock(&cifs_tcp_ses_lock);
2184 return NULL;
2185 }
2186
2187 void
2188 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2189 {
2190 struct task_struct *task;
2191
2192 spin_lock(&cifs_tcp_ses_lock);
2193 if (--server->srv_count > 0) {
2194 spin_unlock(&cifs_tcp_ses_lock);
2195 return;
2196 }
2197
2198 put_net(cifs_net_ns(server));
2199
2200 list_del_init(&server->tcp_ses_list);
2201 spin_unlock(&cifs_tcp_ses_lock);
2202
2203 cancel_delayed_work_sync(&server->echo);
2204
2205 if (from_reconnect)
2206 /*
2207 * Avoid deadlock here: reconnect work calls
2208 * cifs_put_tcp_session() at its end. Need to be sure
2209 * that reconnect work does nothing with server pointer after
2210 * that step.
2211 */
2212 cancel_delayed_work(&server->reconnect);
2213 else
2214 cancel_delayed_work_sync(&server->reconnect);
2215
2216 spin_lock(&GlobalMid_Lock);
2217 server->tcpStatus = CifsExiting;
2218 spin_unlock(&GlobalMid_Lock);
2219
2220 cifs_crypto_secmech_release(server);
2221 cifs_fscache_release_client_cookie(server);
2222
2223 kfree(server->session_key.response);
2224 server->session_key.response = NULL;
2225 server->session_key.len = 0;
2226
2227 task = xchg(&server->tsk, NULL);
2228 if (task)
2229 force_sig(SIGKILL, task);
2230 }
2231
2232 static struct TCP_Server_Info *
2233 cifs_get_tcp_session(struct smb_vol *volume_info)
2234 {
2235 struct TCP_Server_Info *tcp_ses = NULL;
2236 int rc;
2237
2238 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2239
2240 /* see if we already have a matching tcp_ses */
2241 tcp_ses = cifs_find_tcp_session(volume_info);
2242 if (tcp_ses)
2243 return tcp_ses;
2244
2245 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2246 if (!tcp_ses) {
2247 rc = -ENOMEM;
2248 goto out_err;
2249 }
2250
2251 tcp_ses->ops = volume_info->ops;
2252 tcp_ses->vals = volume_info->vals;
2253 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2254 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2255 if (IS_ERR(tcp_ses->hostname)) {
2256 rc = PTR_ERR(tcp_ses->hostname);
2257 goto out_err_crypto_release;
2258 }
2259
2260 tcp_ses->noblocksnd = volume_info->noblocksnd;
2261 tcp_ses->noautotune = volume_info->noautotune;
2262 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2263 tcp_ses->in_flight = 0;
2264 tcp_ses->credits = 1;
2265 init_waitqueue_head(&tcp_ses->response_q);
2266 init_waitqueue_head(&tcp_ses->request_q);
2267 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2268 mutex_init(&tcp_ses->srv_mutex);
2269 memcpy(tcp_ses->workstation_RFC1001_name,
2270 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2271 memcpy(tcp_ses->server_RFC1001_name,
2272 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2273 tcp_ses->session_estab = false;
2274 tcp_ses->sequence_number = 0;
2275 tcp_ses->lstrp = jiffies;
2276 spin_lock_init(&tcp_ses->req_lock);
2277 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2278 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2279 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2280 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2281 mutex_init(&tcp_ses->reconnect_mutex);
2282 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2283 sizeof(tcp_ses->srcaddr));
2284 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2285 sizeof(tcp_ses->dstaddr));
2286 generate_random_uuid(tcp_ses->client_guid);
2287 /*
2288 * at this point we are the only ones with the pointer
2289 * to the struct since the kernel thread not created yet
2290 * no need to spinlock this init of tcpStatus or srv_count
2291 */
2292 tcp_ses->tcpStatus = CifsNew;
2293 ++tcp_ses->srv_count;
2294
2295 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2296 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2297 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2298 else
2299 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2300
2301 rc = ip_connect(tcp_ses);
2302 if (rc < 0) {
2303 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2304 goto out_err_crypto_release;
2305 }
2306
2307 /*
2308 * since we're in a cifs function already, we know that
2309 * this will succeed. No need for try_module_get().
2310 */
2311 __module_get(THIS_MODULE);
2312 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2313 tcp_ses, "cifsd");
2314 if (IS_ERR(tcp_ses->tsk)) {
2315 rc = PTR_ERR(tcp_ses->tsk);
2316 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2317 module_put(THIS_MODULE);
2318 goto out_err_crypto_release;
2319 }
2320 tcp_ses->tcpStatus = CifsNeedNegotiate;
2321
2322 /* thread spawned, put it on the list */
2323 spin_lock(&cifs_tcp_ses_lock);
2324 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2325 spin_unlock(&cifs_tcp_ses_lock);
2326
2327 cifs_fscache_get_client_cookie(tcp_ses);
2328
2329 /* queue echo request delayed work */
2330 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2331
2332 return tcp_ses;
2333
2334 out_err_crypto_release:
2335 cifs_crypto_secmech_release(tcp_ses);
2336
2337 put_net(cifs_net_ns(tcp_ses));
2338
2339 out_err:
2340 if (tcp_ses) {
2341 if (!IS_ERR(tcp_ses->hostname))
2342 kfree(tcp_ses->hostname);
2343 if (tcp_ses->ssocket)
2344 sock_release(tcp_ses->ssocket);
2345 kfree(tcp_ses);
2346 }
2347 return ERR_PTR(rc);
2348 }
2349
2350 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2351 {
2352 if (vol->sectype != Unspecified &&
2353 vol->sectype != ses->sectype)
2354 return 0;
2355
2356 switch (ses->sectype) {
2357 case Kerberos:
2358 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2359 return 0;
2360 break;
2361 default:
2362 /* NULL username means anonymous session */
2363 if (ses->user_name == NULL) {
2364 if (!vol->nullauth)
2365 return 0;
2366 break;
2367 }
2368
2369 /* anything else takes username/password */
2370 if (strncmp(ses->user_name,
2371 vol->username ? vol->username : "",
2372 CIFS_MAX_USERNAME_LEN))
2373 return 0;
2374 if ((vol->username && strlen(vol->username) != 0) &&
2375 ses->password != NULL &&
2376 strncmp(ses->password,
2377 vol->password ? vol->password : "",
2378 CIFS_MAX_PASSWORD_LEN))
2379 return 0;
2380 }
2381 return 1;
2382 }
2383
2384 /**
2385 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2386 *
2387 * A new IPC connection is made and stored in the session
2388 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2389 */
2390 static int
2391 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2392 {
2393 int rc = 0, xid;
2394 struct cifs_tcon *tcon;
2395 struct nls_table *nls_codepage;
2396 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2397 bool seal = false;
2398
2399 /*
2400 * If the mount request that resulted in the creation of the
2401 * session requires encryption, force IPC to be encrypted too.
2402 */
2403 if (volume_info->seal) {
2404 if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2405 seal = true;
2406 else {
2407 cifs_dbg(VFS,
2408 "IPC: server doesn't support encryption\n");
2409 return -EOPNOTSUPP;
2410 }
2411 }
2412
2413 tcon = tconInfoAlloc();
2414 if (tcon == NULL)
2415 return -ENOMEM;
2416
2417 snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
2418
2419 /* cannot fail */
2420 nls_codepage = load_nls_default();
2421
2422 xid = get_xid();
2423 tcon->ses = ses;
2424 tcon->ipc = true;
2425 tcon->seal = seal;
2426 rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2427 free_xid(xid);
2428
2429 if (rc) {
2430 cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2431 tconInfoFree(tcon);
2432 goto out;
2433 }
2434
2435 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2436
2437 ses->tcon_ipc = tcon;
2438 out:
2439 unload_nls(nls_codepage);
2440 return rc;
2441 }
2442
2443 /**
2444 * cifs_free_ipc - helper to release the session IPC tcon
2445 *
2446 * Needs to be called everytime a session is destroyed
2447 */
2448 static int
2449 cifs_free_ipc(struct cifs_ses *ses)
2450 {
2451 int rc = 0, xid;
2452 struct cifs_tcon *tcon = ses->tcon_ipc;
2453
2454 if (tcon == NULL)
2455 return 0;
2456
2457 if (ses->server->ops->tree_disconnect) {
2458 xid = get_xid();
2459 rc = ses->server->ops->tree_disconnect(xid, tcon);
2460 free_xid(xid);
2461 }
2462
2463 if (rc)
2464 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2465
2466 tconInfoFree(tcon);
2467 ses->tcon_ipc = NULL;
2468 return rc;
2469 }
2470
2471 static struct cifs_ses *
2472 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2473 {
2474 struct cifs_ses *ses;
2475
2476 spin_lock(&cifs_tcp_ses_lock);
2477 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2478 if (ses->status == CifsExiting)
2479 continue;
2480 if (!match_session(ses, vol))
2481 continue;
2482 ++ses->ses_count;
2483 spin_unlock(&cifs_tcp_ses_lock);
2484 return ses;
2485 }
2486 spin_unlock(&cifs_tcp_ses_lock);
2487 return NULL;
2488 }
2489
2490 static void
2491 cifs_put_smb_ses(struct cifs_ses *ses)
2492 {
2493 unsigned int rc, xid;
2494 struct TCP_Server_Info *server = ses->server;
2495
2496 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2497
2498 spin_lock(&cifs_tcp_ses_lock);
2499 if (ses->status == CifsExiting) {
2500 spin_unlock(&cifs_tcp_ses_lock);
2501 return;
2502 }
2503 if (--ses->ses_count > 0) {
2504 spin_unlock(&cifs_tcp_ses_lock);
2505 return;
2506 }
2507 if (ses->status == CifsGood)
2508 ses->status = CifsExiting;
2509 spin_unlock(&cifs_tcp_ses_lock);
2510
2511 cifs_free_ipc(ses);
2512
2513 if (ses->status == CifsExiting && server->ops->logoff) {
2514 xid = get_xid();
2515 rc = server->ops->logoff(xid, ses);
2516 if (rc)
2517 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2518 __func__, rc);
2519 _free_xid(xid);
2520 }
2521
2522 spin_lock(&cifs_tcp_ses_lock);
2523 list_del_init(&ses->smb_ses_list);
2524 spin_unlock(&cifs_tcp_ses_lock);
2525
2526 sesInfoFree(ses);
2527 cifs_put_tcp_session(server, 0);
2528 }
2529
2530 #ifdef CONFIG_KEYS
2531
2532 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2533 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2534
2535 /* Populate username and pw fields from keyring if possible */
2536 static int
2537 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2538 {
2539 int rc = 0;
2540 const char *delim, *payload;
2541 char *desc;
2542 ssize_t len;
2543 struct key *key;
2544 struct TCP_Server_Info *server = ses->server;
2545 struct sockaddr_in *sa;
2546 struct sockaddr_in6 *sa6;
2547 const struct user_key_payload *upayload;
2548
2549 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2550 if (!desc)
2551 return -ENOMEM;
2552
2553 /* try to find an address key first */
2554 switch (server->dstaddr.ss_family) {
2555 case AF_INET:
2556 sa = (struct sockaddr_in *)&server->dstaddr;
2557 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2558 break;
2559 case AF_INET6:
2560 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2561 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2562 break;
2563 default:
2564 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2565 server->dstaddr.ss_family);
2566 rc = -EINVAL;
2567 goto out_err;
2568 }
2569
2570 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2571 key = request_key(&key_type_logon, desc, "");
2572 if (IS_ERR(key)) {
2573 if (!ses->domainName) {
2574 cifs_dbg(FYI, "domainName is NULL\n");
2575 rc = PTR_ERR(key);
2576 goto out_err;
2577 }
2578
2579 /* didn't work, try to find a domain key */
2580 sprintf(desc, "cifs:d:%s", ses->domainName);
2581 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2582 key = request_key(&key_type_logon, desc, "");
2583 if (IS_ERR(key)) {
2584 rc = PTR_ERR(key);
2585 goto out_err;
2586 }
2587 }
2588
2589 down_read(&key->sem);
2590 upayload = user_key_payload_locked(key);
2591 if (IS_ERR_OR_NULL(upayload)) {
2592 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2593 goto out_key_put;
2594 }
2595
2596 /* find first : in payload */
2597 payload = upayload->data;
2598 delim = strnchr(payload, upayload->datalen, ':');
2599 cifs_dbg(FYI, "payload=%s\n", payload);
2600 if (!delim) {
2601 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2602 upayload->datalen);
2603 rc = -EINVAL;
2604 goto out_key_put;
2605 }
2606
2607 len = delim - payload;
2608 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2609 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2610 len);
2611 rc = -EINVAL;
2612 goto out_key_put;
2613 }
2614
2615 vol->username = kstrndup(payload, len, GFP_KERNEL);
2616 if (!vol->username) {
2617 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2618 len);
2619 rc = -ENOMEM;
2620 goto out_key_put;
2621 }
2622 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2623
2624 len = key->datalen - (len + 1);
2625 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2626 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2627 rc = -EINVAL;
2628 kfree(vol->username);
2629 vol->username = NULL;
2630 goto out_key_put;
2631 }
2632
2633 ++delim;
2634 vol->password = kstrndup(delim, len, GFP_KERNEL);
2635 if (!vol->password) {
2636 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2637 len);
2638 rc = -ENOMEM;
2639 kfree(vol->username);
2640 vol->username = NULL;
2641 goto out_key_put;
2642 }
2643
2644 out_key_put:
2645 up_read(&key->sem);
2646 key_put(key);
2647 out_err:
2648 kfree(desc);
2649 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2650 return rc;
2651 }
2652 #else /* ! CONFIG_KEYS */
2653 static inline int
2654 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2655 struct cifs_ses *ses __attribute__((unused)))
2656 {
2657 return -ENOSYS;
2658 }
2659 #endif /* CONFIG_KEYS */
2660
2661 static struct cifs_ses *
2662 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2663 {
2664 int rc = -ENOMEM;
2665 unsigned int xid;
2666 struct cifs_ses *ses;
2667 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2668 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2669
2670 xid = get_xid();
2671
2672 ses = cifs_find_smb_ses(server, volume_info);
2673 if (ses) {
2674 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2675 ses->status);
2676
2677 mutex_lock(&ses->session_mutex);
2678 rc = cifs_negotiate_protocol(xid, ses);
2679 if (rc) {
2680 mutex_unlock(&ses->session_mutex);
2681 /* problem -- put our ses reference */
2682 cifs_put_smb_ses(ses);
2683 free_xid(xid);
2684 return ERR_PTR(rc);
2685 }
2686 if (ses->need_reconnect) {
2687 cifs_dbg(FYI, "Session needs reconnect\n");
2688 rc = cifs_setup_session(xid, ses,
2689 volume_info->local_nls);
2690 if (rc) {
2691 mutex_unlock(&ses->session_mutex);
2692 /* problem -- put our reference */
2693 cifs_put_smb_ses(ses);
2694 free_xid(xid);
2695 return ERR_PTR(rc);
2696 }
2697 }
2698 mutex_unlock(&ses->session_mutex);
2699
2700 /* existing SMB ses has a server reference already */
2701 cifs_put_tcp_session(server, 0);
2702 free_xid(xid);
2703 return ses;
2704 }
2705
2706 cifs_dbg(FYI, "Existing smb sess not found\n");
2707 ses = sesInfoAlloc();
2708 if (ses == NULL)
2709 goto get_ses_fail;
2710
2711 /* new SMB session uses our server ref */
2712 ses->server = server;
2713 if (server->dstaddr.ss_family == AF_INET6)
2714 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2715 else
2716 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2717
2718 if (volume_info->username) {
2719 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2720 if (!ses->user_name)
2721 goto get_ses_fail;
2722 }
2723
2724 /* volume_info->password freed at unmount */
2725 if (volume_info->password) {
2726 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2727 if (!ses->password)
2728 goto get_ses_fail;
2729 }
2730 if (volume_info->domainname) {
2731 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2732 if (!ses->domainName)
2733 goto get_ses_fail;
2734 }
2735 if (volume_info->domainauto)
2736 ses->domainAuto = volume_info->domainauto;
2737 ses->cred_uid = volume_info->cred_uid;
2738 ses->linux_uid = volume_info->linux_uid;
2739
2740 ses->sectype = volume_info->sectype;
2741 ses->sign = volume_info->sign;
2742
2743 mutex_lock(&ses->session_mutex);
2744 rc = cifs_negotiate_protocol(xid, ses);
2745 if (!rc)
2746 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2747 mutex_unlock(&ses->session_mutex);
2748 if (rc)
2749 goto get_ses_fail;
2750
2751 /* success, put it on the list */
2752 spin_lock(&cifs_tcp_ses_lock);
2753 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2754 spin_unlock(&cifs_tcp_ses_lock);
2755
2756 free_xid(xid);
2757
2758 cifs_setup_ipc(ses, volume_info);
2759
2760 return ses;
2761
2762 get_ses_fail:
2763 sesInfoFree(ses);
2764 free_xid(xid);
2765 return ERR_PTR(rc);
2766 }
2767
2768 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2769 {
2770 if (tcon->tidStatus == CifsExiting)
2771 return 0;
2772 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2773 return 0;
2774 if (tcon->seal != volume_info->seal)
2775 return 0;
2776 if (tcon->snapshot_time != volume_info->snapshot_time)
2777 return 0;
2778 return 1;
2779 }
2780
2781 static struct cifs_tcon *
2782 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2783 {
2784 struct list_head *tmp;
2785 struct cifs_tcon *tcon;
2786
2787 spin_lock(&cifs_tcp_ses_lock);
2788 list_for_each(tmp, &ses->tcon_list) {
2789 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2790 if (!match_tcon(tcon, volume_info))
2791 continue;
2792 ++tcon->tc_count;
2793 spin_unlock(&cifs_tcp_ses_lock);
2794 return tcon;
2795 }
2796 spin_unlock(&cifs_tcp_ses_lock);
2797 return NULL;
2798 }
2799
2800 void
2801 cifs_put_tcon(struct cifs_tcon *tcon)
2802 {
2803 unsigned int xid;
2804 struct cifs_ses *ses;
2805
2806 /*
2807 * IPC tcon share the lifetime of their session and are
2808 * destroyed in the session put function
2809 */
2810 if (tcon == NULL || tcon->ipc)
2811 return;
2812
2813 ses = tcon->ses;
2814 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2815 spin_lock(&cifs_tcp_ses_lock);
2816 if (--tcon->tc_count > 0) {
2817 spin_unlock(&cifs_tcp_ses_lock);
2818 return;
2819 }
2820
2821 list_del_init(&tcon->tcon_list);
2822 spin_unlock(&cifs_tcp_ses_lock);
2823
2824 xid = get_xid();
2825 if (ses->server->ops->tree_disconnect)
2826 ses->server->ops->tree_disconnect(xid, tcon);
2827 _free_xid(xid);
2828
2829 cifs_fscache_release_super_cookie(tcon);
2830 tconInfoFree(tcon);
2831 cifs_put_smb_ses(ses);
2832 }
2833
2834 static struct cifs_tcon *
2835 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2836 {
2837 int rc, xid;
2838 struct cifs_tcon *tcon;
2839
2840 tcon = cifs_find_tcon(ses, volume_info);
2841 if (tcon) {
2842 cifs_dbg(FYI, "Found match on UNC path\n");
2843 /* existing tcon already has a reference */
2844 cifs_put_smb_ses(ses);
2845 return tcon;
2846 }
2847
2848 if (!ses->server->ops->tree_connect) {
2849 rc = -ENOSYS;
2850 goto out_fail;
2851 }
2852
2853 tcon = tconInfoAlloc();
2854 if (tcon == NULL) {
2855 rc = -ENOMEM;
2856 goto out_fail;
2857 }
2858
2859 if (volume_info->snapshot_time) {
2860 if (ses->server->vals->protocol_id == 0) {
2861 cifs_dbg(VFS,
2862 "Use SMB2 or later for snapshot mount option\n");
2863 rc = -EOPNOTSUPP;
2864 goto out_fail;
2865 } else
2866 tcon->snapshot_time = volume_info->snapshot_time;
2867 }
2868
2869 tcon->ses = ses;
2870 if (volume_info->password) {
2871 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2872 if (!tcon->password) {
2873 rc = -ENOMEM;
2874 goto out_fail;
2875 }
2876 }
2877
2878 /*
2879 * BB Do we need to wrap session_mutex around this TCon call and Unix
2880 * SetFS as we do on SessSetup and reconnect?
2881 */
2882 xid = get_xid();
2883 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2884 volume_info->local_nls);
2885 free_xid(xid);
2886 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2887 if (rc)
2888 goto out_fail;
2889
2890 if (volume_info->nodfs) {
2891 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2892 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2893 }
2894 tcon->use_persistent = false;
2895 /* check if SMB2 or later, CIFS does not support persistent handles */
2896 if (volume_info->persistent) {
2897 if (ses->server->vals->protocol_id == 0) {
2898 cifs_dbg(VFS,
2899 "SMB3 or later required for persistent handles\n");
2900 rc = -EOPNOTSUPP;
2901 goto out_fail;
2902 } else if (ses->server->capabilities &
2903 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2904 tcon->use_persistent = true;
2905 else /* persistent handles requested but not supported */ {
2906 cifs_dbg(VFS,
2907 "Persistent handles not supported on share\n");
2908 rc = -EOPNOTSUPP;
2909 goto out_fail;
2910 }
2911 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2912 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2913 && (volume_info->nopersistent == false)) {
2914 cifs_dbg(FYI, "enabling persistent handles\n");
2915 tcon->use_persistent = true;
2916 } else if (volume_info->resilient) {
2917 if (ses->server->vals->protocol_id == 0) {
2918 cifs_dbg(VFS,
2919 "SMB2.1 or later required for resilient handles\n");
2920 rc = -EOPNOTSUPP;
2921 goto out_fail;
2922 }
2923 tcon->use_resilient = true;
2924 }
2925
2926 if (volume_info->seal) {
2927 if (ses->server->vals->protocol_id == 0) {
2928 cifs_dbg(VFS,
2929 "SMB3 or later required for encryption\n");
2930 rc = -EOPNOTSUPP;
2931 goto out_fail;
2932 } else if (tcon->ses->server->capabilities &
2933 SMB2_GLOBAL_CAP_ENCRYPTION)
2934 tcon->seal = true;
2935 else {
2936 cifs_dbg(VFS, "Encryption is not supported on share\n");
2937 rc = -EOPNOTSUPP;
2938 goto out_fail;
2939 }
2940 }
2941
2942 /*
2943 * We can have only one retry value for a connection to a share so for
2944 * resources mounted more than once to the same server share the last
2945 * value passed in for the retry flag is used.
2946 */
2947 tcon->retry = volume_info->retry;
2948 tcon->nocase = volume_info->nocase;
2949 tcon->local_lease = volume_info->local_lease;
2950 INIT_LIST_HEAD(&tcon->pending_opens);
2951
2952 spin_lock(&cifs_tcp_ses_lock);
2953 list_add(&tcon->tcon_list, &ses->tcon_list);
2954 spin_unlock(&cifs_tcp_ses_lock);
2955
2956 cifs_fscache_get_super_cookie(tcon);
2957
2958 return tcon;
2959
2960 out_fail:
2961 tconInfoFree(tcon);
2962 return ERR_PTR(rc);
2963 }
2964
2965 void
2966 cifs_put_tlink(struct tcon_link *tlink)
2967 {
2968 if (!tlink || IS_ERR(tlink))
2969 return;
2970
2971 if (!atomic_dec_and_test(&tlink->tl_count) ||
2972 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2973 tlink->tl_time = jiffies;
2974 return;
2975 }
2976
2977 if (!IS_ERR(tlink_tcon(tlink)))
2978 cifs_put_tcon(tlink_tcon(tlink));
2979 kfree(tlink);
2980 return;
2981 }
2982
2983 static inline struct tcon_link *
2984 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2985 {
2986 return cifs_sb->master_tlink;
2987 }
2988
2989 static int
2990 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2991 {
2992 struct cifs_sb_info *old = CIFS_SB(sb);
2993 struct cifs_sb_info *new = mnt_data->cifs_sb;
2994
2995 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2996 return 0;
2997
2998 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2999 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
3000 return 0;
3001
3002 /*
3003 * We want to share sb only if we don't specify an r/wsize or
3004 * specified r/wsize is greater than or equal to existing one.
3005 */
3006 if (new->wsize && new->wsize < old->wsize)
3007 return 0;
3008
3009 if (new->rsize && new->rsize < old->rsize)
3010 return 0;
3011
3012 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3013 return 0;
3014
3015 if (old->mnt_file_mode != new->mnt_file_mode ||
3016 old->mnt_dir_mode != new->mnt_dir_mode)
3017 return 0;
3018
3019 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3020 return 0;
3021
3022 if (old->actimeo != new->actimeo)
3023 return 0;
3024
3025 return 1;
3026 }
3027
3028 static int
3029 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3030 {
3031 struct cifs_sb_info *old = CIFS_SB(sb);
3032 struct cifs_sb_info *new = mnt_data->cifs_sb;
3033 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3034 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3035
3036 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3037 return 1;
3038 else if (!old_set && !new_set)
3039 return 1;
3040
3041 return 0;
3042 }
3043
3044 int
3045 cifs_match_super(struct super_block *sb, void *data)
3046 {
3047 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3048 struct smb_vol *volume_info;
3049 struct cifs_sb_info *cifs_sb;
3050 struct TCP_Server_Info *tcp_srv;
3051 struct cifs_ses *ses;
3052 struct cifs_tcon *tcon;
3053 struct tcon_link *tlink;
3054 int rc = 0;
3055
3056 spin_lock(&cifs_tcp_ses_lock);
3057 cifs_sb = CIFS_SB(sb);
3058 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3059 if (IS_ERR(tlink)) {
3060 spin_unlock(&cifs_tcp_ses_lock);
3061 return rc;
3062 }
3063 tcon = tlink_tcon(tlink);
3064 ses = tcon->ses;
3065 tcp_srv = ses->server;
3066
3067 volume_info = mnt_data->vol;
3068
3069 if (!match_server(tcp_srv, volume_info) ||
3070 !match_session(ses, volume_info) ||
3071 !match_tcon(tcon, volume_info) ||
3072 !match_prepath(sb, mnt_data)) {
3073 rc = 0;
3074 goto out;
3075 }
3076
3077 rc = compare_mount_options(sb, mnt_data);
3078 out:
3079 spin_unlock(&cifs_tcp_ses_lock);
3080 cifs_put_tlink(tlink);
3081 return rc;
3082 }
3083
3084 int
3085 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
3086 const struct nls_table *nls_codepage, unsigned int *num_referrals,
3087 struct dfs_info3_param **referrals, int remap)
3088 {
3089 int rc = 0;
3090
3091 if (!ses->server->ops->get_dfs_refer)
3092 return -ENOSYS;
3093
3094 *num_referrals = 0;
3095 *referrals = NULL;
3096
3097 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3098 referrals, num_referrals,
3099 nls_codepage, remap);
3100 return rc;
3101 }
3102
3103 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3104 static struct lock_class_key cifs_key[2];
3105 static struct lock_class_key cifs_slock_key[2];
3106
3107 static inline void
3108 cifs_reclassify_socket4(struct socket *sock)
3109 {
3110 struct sock *sk = sock->sk;
3111 BUG_ON(!sock_allow_reclassification(sk));
3112 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3113 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3114 }
3115
3116 static inline void
3117 cifs_reclassify_socket6(struct socket *sock)
3118 {
3119 struct sock *sk = sock->sk;
3120 BUG_ON(!sock_allow_reclassification(sk));
3121 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3122 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3123 }
3124 #else
3125 static inline void
3126 cifs_reclassify_socket4(struct socket *sock)
3127 {
3128 }
3129
3130 static inline void
3131 cifs_reclassify_socket6(struct socket *sock)
3132 {
3133 }
3134 #endif
3135
3136 /* See RFC1001 section 14 on representation of Netbios names */
3137 static void rfc1002mangle(char *target, char *source, unsigned int length)
3138 {
3139 unsigned int i, j;
3140
3141 for (i = 0, j = 0; i < (length); i++) {
3142 /* mask a nibble at a time and encode */
3143 target[j] = 'A' + (0x0F & (source[i] >> 4));
3144 target[j+1] = 'A' + (0x0F & source[i]);
3145 j += 2;
3146 }
3147
3148 }
3149
3150 static int
3151 bind_socket(struct TCP_Server_Info *server)
3152 {
3153 int rc = 0;
3154 if (server->srcaddr.ss_family != AF_UNSPEC) {
3155 /* Bind to the specified local IP address */
3156 struct socket *socket = server->ssocket;
3157 rc = socket->ops->bind(socket,
3158 (struct sockaddr *) &server->srcaddr,
3159 sizeof(server->srcaddr));
3160 if (rc < 0) {
3161 struct sockaddr_in *saddr4;
3162 struct sockaddr_in6 *saddr6;
3163 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3164 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3165 if (saddr6->sin6_family == AF_INET6)
3166 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3167 &saddr6->sin6_addr, rc);
3168 else
3169 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3170 &saddr4->sin_addr.s_addr, rc);
3171 }
3172 }
3173 return rc;
3174 }
3175
3176 static int
3177 ip_rfc1001_connect(struct TCP_Server_Info *server)
3178 {
3179 int rc = 0;
3180 /*
3181 * some servers require RFC1001 sessinit before sending
3182 * negprot - BB check reconnection in case where second
3183 * sessinit is sent but no second negprot
3184 */
3185 struct rfc1002_session_packet *ses_init_buf;
3186 struct smb_hdr *smb_buf;
3187 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3188 GFP_KERNEL);
3189 if (ses_init_buf) {
3190 ses_init_buf->trailer.session_req.called_len = 32;
3191
3192 if (server->server_RFC1001_name[0] != 0)
3193 rfc1002mangle(ses_init_buf->trailer.
3194 session_req.called_name,
3195 server->server_RFC1001_name,
3196 RFC1001_NAME_LEN_WITH_NULL);
3197 else
3198 rfc1002mangle(ses_init_buf->trailer.
3199 session_req.called_name,
3200 DEFAULT_CIFS_CALLED_NAME,
3201 RFC1001_NAME_LEN_WITH_NULL);
3202
3203 ses_init_buf->trailer.session_req.calling_len = 32;
3204
3205 /*
3206 * calling name ends in null (byte 16) from old smb
3207 * convention.
3208 */
3209 if (server->workstation_RFC1001_name[0] != 0)
3210 rfc1002mangle(ses_init_buf->trailer.
3211 session_req.calling_name,
3212 server->workstation_RFC1001_name,
3213 RFC1001_NAME_LEN_WITH_NULL);
3214 else
3215 rfc1002mangle(ses_init_buf->trailer.
3216 session_req.calling_name,
3217 "LINUX_CIFS_CLNT",
3218 RFC1001_NAME_LEN_WITH_NULL);
3219
3220 ses_init_buf->trailer.session_req.scope1 = 0;
3221 ses_init_buf->trailer.session_req.scope2 = 0;
3222 smb_buf = (struct smb_hdr *)ses_init_buf;
3223
3224 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3225 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3226 rc = smb_send(server, smb_buf, 0x44);
3227 kfree(ses_init_buf);
3228 /*
3229 * RFC1001 layer in at least one server
3230 * requires very short break before negprot
3231 * presumably because not expecting negprot
3232 * to follow so fast. This is a simple
3233 * solution that works without
3234 * complicating the code and causes no
3235 * significant slowing down on mount
3236 * for everyone else
3237 */
3238 usleep_range(1000, 2000);
3239 }
3240 /*
3241 * else the negprot may still work without this
3242 * even though malloc failed
3243 */
3244
3245 return rc;
3246 }
3247
3248 static int
3249 generic_ip_connect(struct TCP_Server_Info *server)
3250 {
3251 int rc = 0;
3252 __be16 sport;
3253 int slen, sfamily;
3254 struct socket *socket = server->ssocket;
3255 struct sockaddr *saddr;
3256
3257 saddr = (struct sockaddr *) &server->dstaddr;
3258
3259 if (server->dstaddr.ss_family == AF_INET6) {
3260 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3261 slen = sizeof(struct sockaddr_in6);
3262 sfamily = AF_INET6;
3263 } else {
3264 sport = ((struct sockaddr_in *) saddr)->sin_port;
3265 slen = sizeof(struct sockaddr_in);
3266 sfamily = AF_INET;
3267 }
3268
3269 if (socket == NULL) {
3270 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3271 IPPROTO_TCP, &socket, 1);
3272 if (rc < 0) {
3273 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3274 server->ssocket = NULL;
3275 return rc;
3276 }
3277
3278 /* BB other socket options to set KEEPALIVE, NODELAY? */
3279 cifs_dbg(FYI, "Socket created\n");
3280 server->ssocket = socket;
3281 socket->sk->sk_allocation = GFP_NOFS;
3282 if (sfamily == AF_INET6)
3283 cifs_reclassify_socket6(socket);
3284 else
3285 cifs_reclassify_socket4(socket);
3286 }
3287
3288 rc = bind_socket(server);
3289 if (rc < 0)
3290 return rc;
3291
3292 /*
3293 * Eventually check for other socket options to change from
3294 * the default. sock_setsockopt not used because it expects
3295 * user space buffer
3296 */
3297 socket->sk->sk_rcvtimeo = 7 * HZ;
3298 socket->sk->sk_sndtimeo = 5 * HZ;
3299
3300 /* make the bufsizes depend on wsize/rsize and max requests */
3301 if (server->noautotune) {
3302 if (socket->sk->sk_sndbuf < (200 * 1024))
3303 socket->sk->sk_sndbuf = 200 * 1024;
3304 if (socket->sk->sk_rcvbuf < (140 * 1024))
3305 socket->sk->sk_rcvbuf = 140 * 1024;
3306 }
3307
3308 if (server->tcp_nodelay) {
3309 int val = 1;
3310 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3311 (char *)&val, sizeof(val));
3312 if (rc)
3313 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3314 rc);
3315 }
3316
3317 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3318 socket->sk->sk_sndbuf,
3319 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3320
3321 rc = socket->ops->connect(socket, saddr, slen, 0);
3322 if (rc < 0) {
3323 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3324 sock_release(socket);
3325 server->ssocket = NULL;
3326 return rc;
3327 }
3328
3329 if (sport == htons(RFC1001_PORT))
3330 rc = ip_rfc1001_connect(server);
3331
3332 return rc;
3333 }
3334
3335 static int
3336 ip_connect(struct TCP_Server_Info *server)
3337 {
3338 __be16 *sport;
3339 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3340 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3341
3342 if (server->dstaddr.ss_family == AF_INET6)
3343 sport = &addr6->sin6_port;
3344 else
3345 sport = &addr->sin_port;
3346
3347 if (*sport == 0) {
3348 int rc;
3349
3350 /* try with 445 port at first */
3351 *sport = htons(CIFS_PORT);
3352
3353 rc = generic_ip_connect(server);
3354 if (rc >= 0)
3355 return rc;
3356
3357 /* if it failed, try with 139 port */
3358 *sport = htons(RFC1001_PORT);
3359 }
3360
3361 return generic_ip_connect(server);
3362 }
3363
3364 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3365 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3366 {
3367 /* if we are reconnecting then should we check to see if
3368 * any requested capabilities changed locally e.g. via
3369 * remount but we can not do much about it here
3370 * if they have (even if we could detect it by the following)
3371 * Perhaps we could add a backpointer to array of sb from tcon
3372 * or if we change to make all sb to same share the same
3373 * sb as NFS - then we only have one backpointer to sb.
3374 * What if we wanted to mount the server share twice once with
3375 * and once without posixacls or posix paths? */
3376 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3377
3378 if (vol_info && vol_info->no_linux_ext) {
3379 tcon->fsUnixInfo.Capability = 0;
3380 tcon->unix_ext = 0; /* Unix Extensions disabled */
3381 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3382 return;
3383 } else if (vol_info)
3384 tcon->unix_ext = 1; /* Unix Extensions supported */
3385
3386 if (tcon->unix_ext == 0) {
3387 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3388 return;
3389 }
3390
3391 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3392 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3393 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3394 /* check for reconnect case in which we do not
3395 want to change the mount behavior if we can avoid it */
3396 if (vol_info == NULL) {
3397 /* turn off POSIX ACL and PATHNAMES if not set
3398 originally at mount time */
3399 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3400 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3401 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3402 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3403 cifs_dbg(VFS, "POSIXPATH support change\n");
3404 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3405 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3406 cifs_dbg(VFS, "possible reconnect error\n");
3407 cifs_dbg(VFS, "server disabled POSIX path support\n");
3408 }
3409 }
3410
3411 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3412 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3413
3414 cap &= CIFS_UNIX_CAP_MASK;
3415 if (vol_info && vol_info->no_psx_acl)
3416 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3417 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3418 cifs_dbg(FYI, "negotiated posix acl support\n");
3419 if (cifs_sb)
3420 cifs_sb->mnt_cifs_flags |=
3421 CIFS_MOUNT_POSIXACL;
3422 }
3423
3424 if (vol_info && vol_info->posix_paths == 0)
3425 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3426 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3427 cifs_dbg(FYI, "negotiate posix pathnames\n");
3428 if (cifs_sb)
3429 cifs_sb->mnt_cifs_flags |=
3430 CIFS_MOUNT_POSIX_PATHS;
3431 }
3432
3433 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3434 #ifdef CONFIG_CIFS_DEBUG2
3435 if (cap & CIFS_UNIX_FCNTL_CAP)
3436 cifs_dbg(FYI, "FCNTL cap\n");
3437 if (cap & CIFS_UNIX_EXTATTR_CAP)
3438 cifs_dbg(FYI, "EXTATTR cap\n");
3439 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3440 cifs_dbg(FYI, "POSIX path cap\n");
3441 if (cap & CIFS_UNIX_XATTR_CAP)
3442 cifs_dbg(FYI, "XATTR cap\n");
3443 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3444 cifs_dbg(FYI, "POSIX ACL cap\n");
3445 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3446 cifs_dbg(FYI, "very large read cap\n");
3447 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3448 cifs_dbg(FYI, "very large write cap\n");
3449 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3450 cifs_dbg(FYI, "transport encryption cap\n");
3451 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3452 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3453 #endif /* CIFS_DEBUG2 */
3454 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3455 if (vol_info == NULL) {
3456 cifs_dbg(FYI, "resetting capabilities failed\n");
3457 } else
3458 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");
3459
3460 }
3461 }
3462 }
3463
3464 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3465 struct cifs_sb_info *cifs_sb)
3466 {
3467 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3468
3469 spin_lock_init(&cifs_sb->tlink_tree_lock);
3470 cifs_sb->tlink_tree = RB_ROOT;
3471
3472 /*
3473 * Temporarily set r/wsize for matching superblock. If we end up using
3474 * new sb then client will later negotiate it downward if needed.
3475 */
3476 cifs_sb->rsize = pvolume_info->rsize;
3477 cifs_sb->wsize = pvolume_info->wsize;
3478
3479 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3480 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3481 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3482 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3483 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3484 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3485
3486 cifs_sb->actimeo = pvolume_info->actimeo;
3487 cifs_sb->local_nls = pvolume_info->local_nls;
3488
3489 if (pvolume_info->noperm)
3490 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3491 if (pvolume_info->setuids)
3492 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3493 if (pvolume_info->setuidfromacl)
3494 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3495 if (pvolume_info->server_ino)
3496 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3497 if (pvolume_info->remap)
3498 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3499 if (pvolume_info->sfu_remap)
3500 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3501 if (pvolume_info->no_xattr)
3502 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3503 if (pvolume_info->sfu_emul)
3504 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3505 if (pvolume_info->nobrl)
3506 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3507 if (pvolume_info->nostrictsync)
3508 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3509 if (pvolume_info->mand_lock)
3510 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3511 if (pvolume_info->rwpidforward)
3512 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3513 if (pvolume_info->cifs_acl)
3514 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3515 if (pvolume_info->backupuid_specified) {
3516 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3517 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3518 }
3519 if (pvolume_info->backupgid_specified) {
3520 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3521 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3522 }
3523 if (pvolume_info->override_uid)
3524 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3525 if (pvolume_info->override_gid)
3526 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3527 if (pvolume_info->dynperm)
3528 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3529 if (pvolume_info->fsc)
3530 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3531 if (pvolume_info->multiuser)
3532 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3533 CIFS_MOUNT_NO_PERM);
3534 if (pvolume_info->strict_io)
3535 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3536 if (pvolume_info->direct_io) {
3537 cifs_dbg(FYI, "mounting share using direct i/o\n");
3538 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3539 }
3540 if (pvolume_info->mfsymlinks) {
3541 if (pvolume_info->sfu_emul) {
3542 /*
3543 * Our SFU ("Services for Unix" emulation does not allow
3544 * creating symlinks but does allow reading existing SFU
3545 * symlinks (it does allow both creating and reading SFU
3546 * style mknod and FIFOs though). When "mfsymlinks" and
3547 * "sfu" are both enabled at the same time, it allows
3548 * reading both types of symlinks, but will only create
3549 * them with mfsymlinks format. This allows better
3550 * Apple compatibility (probably better for Samba too)
3551 * while still recognizing old Windows style symlinks.
3552 */
3553 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3554 }
3555 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3556 }
3557
3558 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3559 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3560
3561 if (pvolume_info->prepath) {
3562 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3563 if (cifs_sb->prepath == NULL)
3564 return -ENOMEM;
3565 }
3566
3567 return 0;
3568 }
3569
3570 static void
3571 cleanup_volume_info_contents(struct smb_vol *volume_info)
3572 {
3573 kfree(volume_info->username);
3574 kzfree(volume_info->password);
3575 kfree(volume_info->UNC);
3576 kfree(volume_info->domainname);
3577 kfree(volume_info->iocharset);
3578 kfree(volume_info->prepath);
3579 }
3580
3581 void
3582 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3583 {
3584 if (!volume_info)
3585 return;
3586 cleanup_volume_info_contents(volume_info);
3587 kfree(volume_info);
3588 }
3589
3590
3591 #ifdef CONFIG_CIFS_DFS_UPCALL
3592 /*
3593 * cifs_build_path_to_root returns full path to root when we do not have an
3594 * exiting connection (tcon)
3595 */
3596 static char *
3597 build_unc_path_to_root(const struct smb_vol *vol,
3598 const struct cifs_sb_info *cifs_sb)
3599 {
3600 char *full_path, *pos;
3601 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3602 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3603
3604 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3605 if (full_path == NULL)
3606 return ERR_PTR(-ENOMEM);
3607
3608 strncpy(full_path, vol->UNC, unc_len);
3609 pos = full_path + unc_len;
3610
3611 if (pplen) {
3612 *pos = CIFS_DIR_SEP(cifs_sb);
3613 strncpy(pos + 1, vol->prepath, pplen);
3614 pos += pplen;
3615 }
3616
3617 *pos = '\0'; /* add trailing null */
3618 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3619 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3620 return full_path;
3621 }
3622
3623 /*
3624 * Perform a dfs referral query for a share and (optionally) prefix
3625 *
3626 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3627 * to a string containing updated options for the submount. Otherwise it
3628 * will be left untouched.
3629 *
3630 * Returns the rc from get_dfs_path to the caller, which can be used to
3631 * determine whether there were referrals.
3632 */
3633 static int
3634 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3635 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3636 int check_prefix)
3637 {
3638 int rc;
3639 unsigned int num_referrals = 0;
3640 struct dfs_info3_param *referrals = NULL;
3641 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3642
3643 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3644 if (IS_ERR(full_path))
3645 return PTR_ERR(full_path);
3646
3647 /* For DFS paths, skip the first '\' of the UNC */
3648 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3649
3650 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3651 &num_referrals, &referrals, cifs_remap(cifs_sb));
3652
3653 if (!rc && num_referrals > 0) {
3654 char *fake_devname = NULL;
3655
3656 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3657 full_path + 1, referrals,
3658 &fake_devname);
3659
3660 free_dfs_info_array(referrals, num_referrals);
3661
3662 if (IS_ERR(mdata)) {
3663 rc = PTR_ERR(mdata);
3664 mdata = NULL;
3665 } else {
3666 cleanup_volume_info_contents(volume_info);
3667 rc = cifs_setup_volume_info(volume_info, mdata,
3668 fake_devname);
3669 }
3670 kfree(fake_devname);
3671 kfree(cifs_sb->mountdata);
3672 cifs_sb->mountdata = mdata;
3673 }
3674 kfree(full_path);
3675 return rc;
3676 }
3677 #endif
3678
3679 static int
3680 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3681 const char *devname)
3682 {
3683 int rc = 0;
3684
3685 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3686 return -EINVAL;
3687
3688 if (volume_info->nullauth) {
3689 cifs_dbg(FYI, "Anonymous login\n");
3690 kfree(volume_info->username);
3691 volume_info->username = NULL;
3692 } else if (volume_info->username) {
3693 /* BB fixme parse for domain name here */
3694 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3695 } else {
3696 cifs_dbg(VFS, "No username specified\n");
3697 /* In userspace mount helper we can get user name from alternate
3698 locations such as env variables and files on disk */
3699 return -EINVAL;
3700 }
3701
3702 /* this is needed for ASCII cp to Unicode converts */
3703 if (volume_info->iocharset == NULL) {
3704 /* load_nls_default cannot return null */
3705 volume_info->local_nls = load_nls_default();
3706 } else {
3707 volume_info->local_nls = load_nls(volume_info->iocharset);
3708 if (volume_info->local_nls == NULL) {
3709 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3710 volume_info->iocharset);
3711 return -ELIBACC;
3712 }
3713 }
3714
3715 return rc;
3716 }
3717
3718 struct smb_vol *
3719 cifs_get_volume_info(char *mount_data, const char *devname)
3720 {
3721 int rc;
3722 struct smb_vol *volume_info;
3723
3724 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3725 if (!volume_info)
3726 return ERR_PTR(-ENOMEM);
3727
3728 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3729 if (rc) {
3730 cifs_cleanup_volume_info(volume_info);
3731 volume_info = ERR_PTR(rc);
3732 }
3733
3734 return volume_info;
3735 }
3736
3737 static int
3738 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3739 unsigned int xid,
3740 struct cifs_tcon *tcon,
3741 struct cifs_sb_info *cifs_sb,
3742 char *full_path)
3743 {
3744 int rc;
3745 char *s;
3746 char sep, tmp;
3747
3748 sep = CIFS_DIR_SEP(cifs_sb);
3749 s = full_path;
3750
3751 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3752 while (rc == 0) {
3753 /* skip separators */
3754 while (*s == sep)
3755 s++;
3756 if (!*s)
3757 break;
3758 /* next separator */
3759 while (*s && *s != sep)
3760 s++;
3761
3762 /*
3763 * temporarily null-terminate the path at the end of
3764 * the current component
3765 */
3766 tmp = *s;
3767 *s = 0;
3768 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3769 full_path);
3770 *s = tmp;
3771 }
3772 return rc;
3773 }
3774
3775 int
3776 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3777 {
3778 int rc;
3779 unsigned int xid;
3780 struct cifs_ses *ses;
3781 struct cifs_tcon *tcon;
3782 struct TCP_Server_Info *server;
3783 char *full_path;
3784 struct tcon_link *tlink;
3785 #ifdef CONFIG_CIFS_DFS_UPCALL
3786 int referral_walks_count = 0;
3787 #endif
3788
3789 #ifdef CONFIG_CIFS_DFS_UPCALL
3790 try_mount_again:
3791 /* cleanup activities if we're chasing a referral */
3792 if (referral_walks_count) {
3793 if (tcon)
3794 cifs_put_tcon(tcon);
3795 else if (ses)
3796 cifs_put_smb_ses(ses);
3797
3798 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3799
3800 free_xid(xid);
3801 }
3802 #endif
3803 rc = 0;
3804 tcon = NULL;
3805 ses = NULL;
3806 server = NULL;
3807 full_path = NULL;
3808 tlink = NULL;
3809
3810 xid = get_xid();
3811
3812 /* get a reference to a tcp session */
3813 server = cifs_get_tcp_session(volume_info);
3814 if (IS_ERR(server)) {
3815 rc = PTR_ERR(server);
3816 goto out;
3817 }
3818 if ((volume_info->max_credits < 20) ||
3819 (volume_info->max_credits > 60000))
3820 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3821 else
3822 server->max_credits = volume_info->max_credits;
3823 /* get a reference to a SMB session */
3824 ses = cifs_get_smb_ses(server, volume_info);
3825 if (IS_ERR(ses)) {
3826 rc = PTR_ERR(ses);
3827 ses = NULL;
3828 goto mount_fail_check;
3829 }
3830
3831 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3832 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3833 cifs_dbg(VFS, "persistent handles not supported by server\n");
3834 rc = -EOPNOTSUPP;
3835 goto mount_fail_check;
3836 }
3837
3838 /* search for existing tcon to this server share */
3839 tcon = cifs_get_tcon(ses, volume_info);
3840 if (IS_ERR(tcon)) {
3841 rc = PTR_ERR(tcon);
3842 tcon = NULL;
3843 if (rc == -EACCES)
3844 goto mount_fail_check;
3845
3846 goto remote_path_check;
3847 }
3848
3849 /* tell server which Unix caps we support */
3850 if (cap_unix(tcon->ses)) {
3851 /* reset of caps checks mount to see if unix extensions
3852 disabled for just this mount */
3853 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3854 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3855 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3856 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3857 rc = -EACCES;
3858 goto mount_fail_check;
3859 }
3860 } else
3861 tcon->unix_ext = 0; /* server does not support them */
3862
3863 /* do not care if a following call succeed - informational */
3864 if (!tcon->pipe && server->ops->qfs_tcon)
3865 server->ops->qfs_tcon(xid, tcon);
3866
3867 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3868 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3869
3870 remote_path_check:
3871 #ifdef CONFIG_CIFS_DFS_UPCALL
3872 /*
3873 * Perform an unconditional check for whether there are DFS
3874 * referrals for this path without prefix, to provide support
3875 * for DFS referrals from w2k8 servers which don't seem to respond
3876 * with PATH_NOT_COVERED to requests that include the prefix.
3877 * Chase the referral if found, otherwise continue normally.
3878 */
3879 if (referral_walks_count == 0) {
3880 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3881 false);
3882 if (!refrc) {
3883 referral_walks_count++;
3884 goto try_mount_again;
3885 }
3886 }
3887 #endif
3888
3889 /* check if a whole path is not remote */
3890 if (!rc && tcon) {
3891 if (!server->ops->is_path_accessible) {
3892 rc = -ENOSYS;
3893 goto mount_fail_check;
3894 }
3895 /*
3896 * cifs_build_path_to_root works only when we have a valid tcon
3897 */
3898 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3899 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3900 if (full_path == NULL) {
3901 rc = -ENOMEM;
3902 goto mount_fail_check;
3903 }
3904 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3905 full_path);
3906 if (rc != 0 && rc != -EREMOTE) {
3907 kfree(full_path);
3908 goto mount_fail_check;
3909 }
3910
3911 if (rc != -EREMOTE) {
3912 rc = cifs_are_all_path_components_accessible(server,
3913 xid, tcon, cifs_sb,
3914 full_path);
3915 if (rc != 0) {
3916 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3917 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3918 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3919 rc = 0;
3920 }
3921 }
3922 kfree(full_path);
3923 }
3924
3925 /* get referral if needed */
3926 if (rc == -EREMOTE) {
3927 #ifdef CONFIG_CIFS_DFS_UPCALL
3928 if (referral_walks_count > MAX_NESTED_LINKS) {
3929 /*
3930 * BB: when we implement proper loop detection,
3931 * we will remove this check. But now we need it
3932 * to prevent an indefinite loop if 'DFS tree' is
3933 * misconfigured (i.e. has loops).
3934 */
3935 rc = -ELOOP;
3936 goto mount_fail_check;
3937 }
3938
3939 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3940
3941 if (!rc) {
3942 referral_walks_count++;
3943 goto try_mount_again;
3944 }
3945 goto mount_fail_check;
3946 #else /* No DFS support, return error on mount */
3947 rc = -EOPNOTSUPP;
3948 #endif
3949 }
3950
3951 if (rc)
3952 goto mount_fail_check;
3953
3954 /* now, hang the tcon off of the superblock */
3955 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3956 if (tlink == NULL) {
3957 rc = -ENOMEM;
3958 goto mount_fail_check;
3959 }
3960
3961 tlink->tl_uid = ses->linux_uid;
3962 tlink->tl_tcon = tcon;
3963 tlink->tl_time = jiffies;
3964 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3965 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3966
3967 cifs_sb->master_tlink = tlink;
3968 spin_lock(&cifs_sb->tlink_tree_lock);
3969 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3970 spin_unlock(&cifs_sb->tlink_tree_lock);
3971
3972 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3973 TLINK_IDLE_EXPIRE);
3974
3975 mount_fail_check:
3976 /* on error free sesinfo and tcon struct if needed */
3977 if (rc) {
3978 /* If find_unc succeeded then rc == 0 so we can not end */
3979 /* up accidentally freeing someone elses tcon struct */
3980 if (tcon)
3981 cifs_put_tcon(tcon);
3982 else if (ses)
3983 cifs_put_smb_ses(ses);
3984 else
3985 cifs_put_tcp_session(server, 0);
3986 }
3987
3988 out:
3989 free_xid(xid);
3990 return rc;
3991 }
3992
3993 /*
3994 * Issue a TREE_CONNECT request.
3995 */
3996 int
3997 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3998 const char *tree, struct cifs_tcon *tcon,
3999 const struct nls_table *nls_codepage)
4000 {
4001 struct smb_hdr *smb_buffer;
4002 struct smb_hdr *smb_buffer_response;
4003 TCONX_REQ *pSMB;
4004 TCONX_RSP *pSMBr;
4005 unsigned char *bcc_ptr;
4006 int rc = 0;
4007 int length;
4008 __u16 bytes_left, count;
4009
4010 if (ses == NULL)
4011 return -EIO;
4012
4013 smb_buffer = cifs_buf_get();
4014 if (smb_buffer == NULL)
4015 return -ENOMEM;
4016
4017 smb_buffer_response = smb_buffer;
4018
4019 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
4020 NULL /*no tid */ , 4 /*wct */ );
4021
4022 smb_buffer->Mid = get_next_mid(ses->server);
4023 smb_buffer->Uid = ses->Suid;
4024 pSMB = (TCONX_REQ *) smb_buffer;
4025 pSMBr = (TCONX_RSP *) smb_buffer_response;
4026
4027 pSMB->AndXCommand = 0xFF;
4028 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
4029 bcc_ptr = &pSMB->Password[0];
4030 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
4031 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
4032 *bcc_ptr = 0; /* password is null byte */
4033 bcc_ptr++; /* skip password */
4034 /* already aligned so no need to do it below */
4035 } else {
4036 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
4037 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
4038 specified as required (when that support is added to
4039 the vfs in the future) as only NTLM or the much
4040 weaker LANMAN (which we do not send by default) is accepted
4041 by Samba (not sure whether other servers allow
4042 NTLMv2 password here) */
4043 #ifdef CONFIG_CIFS_WEAK_PW_HASH
4044 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
4045 (ses->sectype == LANMAN))
4046 calc_lanman_hash(tcon->password, ses->server->cryptkey,
4047 ses->server->sec_mode &
4048 SECMODE_PW_ENCRYPT ? true : false,
4049 bcc_ptr);
4050 else
4051 #endif /* CIFS_WEAK_PW_HASH */
4052 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
4053 bcc_ptr, nls_codepage);
4054 if (rc) {
4055 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
4056 __func__, rc);
4057 cifs_buf_release(smb_buffer);
4058 return rc;
4059 }
4060
4061 bcc_ptr += CIFS_AUTH_RESP_SIZE;
4062 if (ses->capabilities & CAP_UNICODE) {
4063 /* must align unicode strings */
4064 *bcc_ptr = 0; /* null byte password */
4065 bcc_ptr++;
4066 }
4067 }
4068
4069 if (ses->server->sign)
4070 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4071
4072 if (ses->capabilities & CAP_STATUS32) {
4073 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4074 }
4075 if (ses->capabilities & CAP_DFS) {
4076 smb_buffer->Flags2 |= SMBFLG2_DFS;
4077 }
4078 if (ses->capabilities & CAP_UNICODE) {
4079 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4080 length =
4081 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4082 6 /* max utf8 char length in bytes */ *
4083 (/* server len*/ + 256 /* share len */), nls_codepage);
4084 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4085 bcc_ptr += 2; /* skip trailing null */
4086 } else { /* ASCII */
4087 strcpy(bcc_ptr, tree);
4088 bcc_ptr += strlen(tree) + 1;
4089 }
4090 strcpy(bcc_ptr, "?????");
4091 bcc_ptr += strlen("?????");
4092 bcc_ptr += 1;
4093 count = bcc_ptr - &pSMB->Password[0];
4094 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4095 pSMB->hdr.smb_buf_length) + count);
4096 pSMB->ByteCount = cpu_to_le16(count);
4097
4098 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4099 0);
4100
4101 /* above now done in SendReceive */
4102 if (rc == 0) {
4103 bool is_unicode;
4104
4105 tcon->tidStatus = CifsGood;
4106 tcon->need_reconnect = false;
4107 tcon->tid = smb_buffer_response->Tid;
4108 bcc_ptr = pByteArea(smb_buffer_response);
4109 bytes_left = get_bcc(smb_buffer_response);
4110 length = strnlen(bcc_ptr, bytes_left - 2);
4111 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4112 is_unicode = true;
4113 else
4114 is_unicode = false;
4115
4116
4117 /* skip service field (NB: this field is always ASCII) */
4118 if (length == 3) {
4119 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4120 (bcc_ptr[2] == 'C')) {
4121 cifs_dbg(FYI, "IPC connection\n");
4122 tcon->ipc = true;
4123 tcon->pipe = true;
4124 }
4125 } else if (length == 2) {
4126 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4127 /* the most common case */
4128 cifs_dbg(FYI, "disk share connection\n");
4129 }
4130 }
4131 bcc_ptr += length + 1;
4132 bytes_left -= (length + 1);
4133 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4134
4135 /* mostly informational -- no need to fail on error here */
4136 kfree(tcon->nativeFileSystem);
4137 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4138 bytes_left, is_unicode,
4139 nls_codepage);
4140
4141 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4142
4143 if ((smb_buffer_response->WordCount == 3) ||
4144 (smb_buffer_response->WordCount == 7))
4145 /* field is in same location */
4146 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4147 else
4148 tcon->Flags = 0;
4149 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4150 }
4151
4152 cifs_buf_release(smb_buffer);
4153 return rc;
4154 }
4155
4156 static void delayed_free(struct rcu_head *p)
4157 {
4158 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4159 unload_nls(sbi->local_nls);
4160 kfree(sbi);
4161 }
4162
4163 void
4164 cifs_umount(struct cifs_sb_info *cifs_sb)
4165 {
4166 struct rb_root *root = &cifs_sb->tlink_tree;
4167 struct rb_node *node;
4168 struct tcon_link *tlink;
4169
4170 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4171
4172 spin_lock(&cifs_sb->tlink_tree_lock);
4173 while ((node = rb_first(root))) {
4174 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4175 cifs_get_tlink(tlink);
4176 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4177 rb_erase(node, root);
4178
4179 spin_unlock(&cifs_sb->tlink_tree_lock);
4180 cifs_put_tlink(tlink);
4181 spin_lock(&cifs_sb->tlink_tree_lock);
4182 }
4183 spin_unlock(&cifs_sb->tlink_tree_lock);
4184
4185 kfree(cifs_sb->mountdata);
4186 kfree(cifs_sb->prepath);
4187 call_rcu(&cifs_sb->rcu, delayed_free);
4188 }
4189
4190 int
4191 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4192 {
4193 int rc = 0;
4194 struct TCP_Server_Info *server = ses->server;
4195
4196 if (!server->ops->need_neg || !server->ops->negotiate)
4197 return -ENOSYS;
4198
4199 /* only send once per connect */
4200 if (!server->ops->need_neg(server))
4201 return 0;
4202
4203 set_credits(server, 1);
4204
4205 rc = server->ops->negotiate(xid, ses);
4206 if (rc == 0) {
4207 spin_lock(&GlobalMid_Lock);
4208 if (server->tcpStatus == CifsNeedNegotiate)
4209 server->tcpStatus = CifsGood;
4210 else
4211 rc = -EHOSTDOWN;
4212 spin_unlock(&GlobalMid_Lock);
4213 }
4214
4215 return rc;
4216 }
4217
4218 int
4219 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4220 struct nls_table *nls_info)
4221 {
4222 int rc = -ENOSYS;
4223 struct TCP_Server_Info *server = ses->server;
4224
4225 ses->capabilities = server->capabilities;
4226 if (linuxExtEnabled == 0)
4227 ses->capabilities &= (~server->vals->cap_unix);
4228
4229 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4230 server->sec_mode, server->capabilities, server->timeAdj);
4231
4232 if (ses->auth_key.response) {
4233 cifs_dbg(VFS, "Free previous auth_key.response = %p\n",
4234 ses->auth_key.response);
4235 kfree(ses->auth_key.response);
4236 ses->auth_key.response = NULL;
4237 ses->auth_key.len = 0;
4238 }
4239
4240 if (server->ops->sess_setup)
4241 rc = server->ops->sess_setup(xid, ses, nls_info);
4242
4243 if (rc)
4244 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4245
4246 return rc;
4247 }
4248
4249 static int
4250 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4251 {
4252 vol->sectype = ses->sectype;
4253
4254 /* krb5 is special, since we don't need username or pw */
4255 if (vol->sectype == Kerberos)
4256 return 0;
4257
4258 return cifs_set_cifscreds(vol, ses);
4259 }
4260
4261 static struct cifs_tcon *
4262 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4263 {
4264 int rc;
4265 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4266 struct cifs_ses *ses;
4267 struct cifs_tcon *tcon = NULL;
4268 struct smb_vol *vol_info;
4269
4270 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4271 if (vol_info == NULL)
4272 return ERR_PTR(-ENOMEM);
4273
4274 vol_info->local_nls = cifs_sb->local_nls;
4275 vol_info->linux_uid = fsuid;
4276 vol_info->cred_uid = fsuid;
4277 vol_info->UNC = master_tcon->treeName;
4278 vol_info->retry = master_tcon->retry;
4279 vol_info->nocase = master_tcon->nocase;
4280 vol_info->local_lease = master_tcon->local_lease;
4281 vol_info->no_linux_ext = !master_tcon->unix_ext;
4282 vol_info->sectype = master_tcon->ses->sectype;
4283 vol_info->sign = master_tcon->ses->sign;
4284
4285 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4286 if (rc) {
4287 tcon = ERR_PTR(rc);
4288 goto out;
4289 }
4290
4291 /* get a reference for the same TCP session */
4292 spin_lock(&cifs_tcp_ses_lock);
4293 ++master_tcon->ses->server->srv_count;
4294 spin_unlock(&cifs_tcp_ses_lock);
4295
4296 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4297 if (IS_ERR(ses)) {
4298 tcon = (struct cifs_tcon *)ses;
4299 cifs_put_tcp_session(master_tcon->ses->server, 0);
4300 goto out;
4301 }
4302
4303 tcon = cifs_get_tcon(ses, vol_info);
4304 if (IS_ERR(tcon)) {
4305 cifs_put_smb_ses(ses);
4306 goto out;
4307 }
4308
4309 if (cap_unix(ses))
4310 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4311 out:
4312 kfree(vol_info->username);
4313 kfree(vol_info->password);
4314 kfree(vol_info);
4315
4316 return tcon;
4317 }
4318
4319 struct cifs_tcon *
4320 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4321 {
4322 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4323 }
4324
4325 /* find and return a tlink with given uid */
4326 static struct tcon_link *
4327 tlink_rb_search(struct rb_root *root, kuid_t uid)
4328 {
4329 struct rb_node *node = root->rb_node;
4330 struct tcon_link *tlink;
4331
4332 while (node) {
4333 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4334
4335 if (uid_gt(tlink->tl_uid, uid))
4336 node = node->rb_left;
4337 else if (uid_lt(tlink->tl_uid, uid))
4338 node = node->rb_right;
4339 else
4340 return tlink;
4341 }
4342 return NULL;
4343 }
4344
4345 /* insert a tcon_link into the tree */
4346 static void
4347 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4348 {
4349 struct rb_node **new = &(root->rb_node), *parent = NULL;
4350 struct tcon_link *tlink;
4351
4352 while (*new) {
4353 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4354 parent = *new;
4355
4356 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4357 new = &((*new)->rb_left);
4358 else
4359 new = &((*new)->rb_right);
4360 }
4361
4362 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4363 rb_insert_color(&new_tlink->tl_rbnode, root);
4364 }
4365
4366 /*
4367 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4368 * current task.
4369 *
4370 * If the superblock doesn't refer to a multiuser mount, then just return
4371 * the master tcon for the mount.
4372 *
4373 * First, search the rbtree for an existing tcon for this fsuid. If one
4374 * exists, then check to see if it's pending construction. If it is then wait
4375 * for construction to complete. Once it's no longer pending, check to see if
4376 * it failed and either return an error or retry construction, depending on
4377 * the timeout.
4378 *
4379 * If one doesn't exist then insert a new tcon_link struct into the tree and
4380 * try to construct a new one.
4381 */
4382 struct tcon_link *
4383 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4384 {
4385 int ret;
4386 kuid_t fsuid = current_fsuid();
4387 struct tcon_link *tlink, *newtlink;
4388
4389 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4390 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4391
4392 spin_lock(&cifs_sb->tlink_tree_lock);
4393 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4394 if (tlink)
4395 cifs_get_tlink(tlink);
4396 spin_unlock(&cifs_sb->tlink_tree_lock);
4397
4398 if (tlink == NULL) {
4399 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4400 if (newtlink == NULL)
4401 return ERR_PTR(-ENOMEM);
4402 newtlink->tl_uid = fsuid;
4403 newtlink->tl_tcon = ERR_PTR(-EACCES);
4404 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4405 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4406 cifs_get_tlink(newtlink);
4407
4408 spin_lock(&cifs_sb->tlink_tree_lock);
4409 /* was one inserted after previous search? */
4410 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4411 if (tlink) {
4412 cifs_get_tlink(tlink);
4413 spin_unlock(&cifs_sb->tlink_tree_lock);
4414 kfree(newtlink);
4415 goto wait_for_construction;
4416 }
4417 tlink = newtlink;
4418 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4419 spin_unlock(&cifs_sb->tlink_tree_lock);
4420 } else {
4421 wait_for_construction:
4422 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4423 TASK_INTERRUPTIBLE);
4424 if (ret) {
4425 cifs_put_tlink(tlink);
4426 return ERR_PTR(-ERESTARTSYS);
4427 }
4428
4429 /* if it's good, return it */
4430 if (!IS_ERR(tlink->tl_tcon))
4431 return tlink;
4432
4433 /* return error if we tried this already recently */
4434 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4435 cifs_put_tlink(tlink);
4436 return ERR_PTR(-EACCES);
4437 }
4438
4439 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4440 goto wait_for_construction;
4441 }
4442
4443 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4444 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4445 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4446
4447 if (IS_ERR(tlink->tl_tcon)) {
4448 cifs_put_tlink(tlink);
4449 return ERR_PTR(-EACCES);
4450 }
4451
4452 return tlink;
4453 }
4454
4455 /*
4456 * periodic workqueue job that scans tcon_tree for a superblock and closes
4457 * out tcons.
4458 */
4459 static void
4460 cifs_prune_tlinks(struct work_struct *work)
4461 {
4462 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4463 prune_tlinks.work);
4464 struct rb_root *root = &cifs_sb->tlink_tree;
4465 struct rb_node *node = rb_first(root);
4466 struct rb_node *tmp;
4467 struct tcon_link *tlink;
4468
4469 /*
4470 * Because we drop the spinlock in the loop in order to put the tlink
4471 * it's not guarded against removal of links from the tree. The only
4472 * places that remove entries from the tree are this function and
4473 * umounts. Because this function is non-reentrant and is canceled
4474 * before umount can proceed, this is safe.
4475 */
4476 spin_lock(&cifs_sb->tlink_tree_lock);
4477 node = rb_first(root);
4478 while (node != NULL) {
4479 tmp = node;
4480 node = rb_next(tmp);
4481 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4482
4483 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4484 atomic_read(&tlink->tl_count) != 0 ||
4485 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4486 continue;
4487
4488 cifs_get_tlink(tlink);
4489 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4490 rb_erase(tmp, root);
4491
4492 spin_unlock(&cifs_sb->tlink_tree_lock);
4493 cifs_put_tlink(tlink);
4494 spin_lock(&cifs_sb->tlink_tree_lock);
4495 }
4496 spin_unlock(&cifs_sb->tlink_tree_lock);
4497
4498 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4499 TLINK_IDLE_EXPIRE);
4500 }
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