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Merge tag 'xtensa-20180225' of git://github.com/jcmvbkbc/linux-xtensa
[cris-mirror.git] / fs / cifs / connect.c
bloba726f524fb84aa2ee1114eb1187f68eec84fbd30
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 #include "cifspdu.h"
48 #include "cifsglob.h"
49 #include "cifsproto.h"
50 #include "cifs_unicode.h"
51 #include "cifs_debug.h"
52 #include "cifs_fs_sb.h"
53 #include "ntlmssp.h"
54 #include "nterr.h"
55 #include "rfc1002pdu.h"
56 #include "fscache.h"
57 #include "smb2proto.h"
58 #include "smbdirect.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, Opt_rdma,
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 { Opt_rdma, "rdma"},
187
188 { Opt_backupuid, "backupuid=%s" },
189 { Opt_backupgid, "backupgid=%s" },
190 { Opt_uid, "uid=%s" },
191 { Opt_cruid, "cruid=%s" },
192 { Opt_gid, "gid=%s" },
193 { Opt_file_mode, "file_mode=%s" },
194 { Opt_dirmode, "dirmode=%s" },
195 { Opt_dirmode, "dir_mode=%s" },
196 { Opt_port, "port=%s" },
197 { Opt_rsize, "rsize=%s" },
198 { Opt_wsize, "wsize=%s" },
199 { Opt_actimeo, "actimeo=%s" },
200 { Opt_echo_interval, "echo_interval=%s" },
201 { Opt_max_credits, "max_credits=%s" },
202 { Opt_snapshot, "snapshot=%s" },
203
204 { Opt_blank_user, "user=" },
205 { Opt_blank_user, "username=" },
206 { Opt_user, "user=%s" },
207 { Opt_user, "username=%s" },
208 { Opt_blank_pass, "pass=" },
209 { Opt_blank_pass, "password=" },
210 { Opt_pass, "pass=%s" },
211 { Opt_pass, "password=%s" },
212 { Opt_blank_ip, "ip=" },
213 { Opt_blank_ip, "addr=" },
214 { Opt_ip, "ip=%s" },
215 { Opt_ip, "addr=%s" },
216 { Opt_ignore, "unc=%s" },
217 { Opt_ignore, "target=%s" },
218 { Opt_ignore, "path=%s" },
219 { Opt_domain, "dom=%s" },
220 { Opt_domain, "domain=%s" },
221 { Opt_domain, "workgroup=%s" },
222 { Opt_srcaddr, "srcaddr=%s" },
223 { Opt_ignore, "prefixpath=%s" },
224 { Opt_iocharset, "iocharset=%s" },
225 { Opt_netbiosname, "netbiosname=%s" },
226 { Opt_servern, "servern=%s" },
227 { Opt_ver, "ver=%s" },
228 { Opt_vers, "vers=%s" },
229 { Opt_sec, "sec=%s" },
230 { Opt_cache, "cache=%s" },
231
232 { Opt_ignore, "cred" },
233 { Opt_ignore, "credentials" },
234 { Opt_ignore, "cred=%s" },
235 { Opt_ignore, "credentials=%s" },
236 { Opt_ignore, "guest" },
237 { Opt_ignore, "rw" },
238 { Opt_ignore, "ro" },
239 { Opt_ignore, "suid" },
240 { Opt_ignore, "nosuid" },
241 { Opt_ignore, "exec" },
242 { Opt_ignore, "noexec" },
243 { Opt_ignore, "nodev" },
244 { Opt_ignore, "noauto" },
245 { Opt_ignore, "dev" },
246 { Opt_ignore, "mand" },
247 { Opt_ignore, "nomand" },
248 { Opt_ignore, "_netdev" },
249
250 { Opt_err, NULL }
251 };
252
253 enum {
254 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
255 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
256 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
257 Opt_sec_ntlmv2i, Opt_sec_lanman,
258 Opt_sec_none,
259
260 Opt_sec_err
261 };
262
263 static const match_table_t cifs_secflavor_tokens = {
264 { Opt_sec_krb5, "krb5" },
265 { Opt_sec_krb5i, "krb5i" },
266 { Opt_sec_krb5p, "krb5p" },
267 { Opt_sec_ntlmsspi, "ntlmsspi" },
268 { Opt_sec_ntlmssp, "ntlmssp" },
269 { Opt_ntlm, "ntlm" },
270 { Opt_sec_ntlmi, "ntlmi" },
271 { Opt_sec_ntlmv2, "nontlm" },
272 { Opt_sec_ntlmv2, "ntlmv2" },
273 { Opt_sec_ntlmv2i, "ntlmv2i" },
274 { Opt_sec_lanman, "lanman" },
275 { Opt_sec_none, "none" },
276
277 { Opt_sec_err, NULL }
278 };
279
280 /* cache flavors */
281 enum {
282 Opt_cache_loose,
283 Opt_cache_strict,
284 Opt_cache_none,
285 Opt_cache_err
286 };
287
288 static const match_table_t cifs_cacheflavor_tokens = {
289 { Opt_cache_loose, "loose" },
290 { Opt_cache_strict, "strict" },
291 { Opt_cache_none, "none" },
292 { Opt_cache_err, NULL }
293 };
294
295 static const match_table_t cifs_smb_version_tokens = {
296 { Smb_1, SMB1_VERSION_STRING },
297 { Smb_20, SMB20_VERSION_STRING},
298 { Smb_21, SMB21_VERSION_STRING },
299 { Smb_30, SMB30_VERSION_STRING },
300 { Smb_302, SMB302_VERSION_STRING },
301 #ifdef CONFIG_CIFS_SMB311
302 { Smb_311, SMB311_VERSION_STRING },
303 { Smb_311, ALT_SMB311_VERSION_STRING },
304 #endif /* SMB311 */
305 { Smb_3any, SMB3ANY_VERSION_STRING },
306 { Smb_default, SMBDEFAULT_VERSION_STRING },
307 { Smb_version_err, NULL }
308 };
309
310 static int ip_connect(struct TCP_Server_Info *server);
311 static int generic_ip_connect(struct TCP_Server_Info *server);
312 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
313 static void cifs_prune_tlinks(struct work_struct *work);
314 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
315 const char *devname);
316
317 /*
318 * cifs tcp session reconnection
319 *
320 * mark tcp session as reconnecting so temporarily locked
321 * mark all smb sessions as reconnecting for tcp session
322 * reconnect tcp session
323 * wake up waiters on reconnection? - (not needed currently)
324 */
325 int
326 cifs_reconnect(struct TCP_Server_Info *server)
327 {
328 int rc = 0;
329 struct list_head *tmp, *tmp2;
330 struct cifs_ses *ses;
331 struct cifs_tcon *tcon;
332 struct mid_q_entry *mid_entry;
333 struct list_head retry_list;
334
335 spin_lock(&GlobalMid_Lock);
336 if (server->tcpStatus == CifsExiting) {
337 /* the demux thread will exit normally
338 next time through the loop */
339 spin_unlock(&GlobalMid_Lock);
340 return rc;
341 } else
342 server->tcpStatus = CifsNeedReconnect;
343 spin_unlock(&GlobalMid_Lock);
344 server->maxBuf = 0;
345 server->max_read = 0;
346
347 cifs_dbg(FYI, "Reconnecting tcp session\n");
348
349 /* before reconnecting the tcp session, mark the smb session (uid)
350 and the tid bad so they are not used until reconnected */
351 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
352 __func__);
353 spin_lock(&cifs_tcp_ses_lock);
354 list_for_each(tmp, &server->smb_ses_list) {
355 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
356 ses->need_reconnect = true;
357 list_for_each(tmp2, &ses->tcon_list) {
358 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
359 tcon->need_reconnect = true;
360 }
361 if (ses->tcon_ipc)
362 ses->tcon_ipc->need_reconnect = true;
363 }
364 spin_unlock(&cifs_tcp_ses_lock);
365
366 /* do not want to be sending data on a socket we are freeing */
367 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
368 mutex_lock(&server->srv_mutex);
369 if (server->ssocket) {
370 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
371 server->ssocket->state, server->ssocket->flags);
372 kernel_sock_shutdown(server->ssocket, SHUT_WR);
373 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
374 server->ssocket->state, server->ssocket->flags);
375 sock_release(server->ssocket);
376 server->ssocket = NULL;
377 }
378 server->sequence_number = 0;
379 server->session_estab = false;
380 kfree(server->session_key.response);
381 server->session_key.response = NULL;
382 server->session_key.len = 0;
383 server->lstrp = jiffies;
384
385 /* mark submitted MIDs for retry and issue callback */
386 INIT_LIST_HEAD(&retry_list);
387 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
388 spin_lock(&GlobalMid_Lock);
389 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
390 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
391 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
392 mid_entry->mid_state = MID_RETRY_NEEDED;
393 list_move(&mid_entry->qhead, &retry_list);
394 }
395 spin_unlock(&GlobalMid_Lock);
396 mutex_unlock(&server->srv_mutex);
397
398 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
399 list_for_each_safe(tmp, tmp2, &retry_list) {
400 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
401 list_del_init(&mid_entry->qhead);
402 mid_entry->callback(mid_entry);
403 }
404
405 do {
406 try_to_freeze();
407
408 /* we should try only the port we connected to before */
409 mutex_lock(&server->srv_mutex);
410 if (cifs_rdma_enabled(server))
411 rc = smbd_reconnect(server);
412 else
413 rc = generic_ip_connect(server);
414 if (rc) {
415 cifs_dbg(FYI, "reconnect error %d\n", rc);
416 mutex_unlock(&server->srv_mutex);
417 msleep(3000);
418 } else {
419 atomic_inc(&tcpSesReconnectCount);
420 spin_lock(&GlobalMid_Lock);
421 if (server->tcpStatus != CifsExiting)
422 server->tcpStatus = CifsNeedNegotiate;
423 spin_unlock(&GlobalMid_Lock);
424 mutex_unlock(&server->srv_mutex);
425 }
426 } while (server->tcpStatus == CifsNeedReconnect);
427
428 if (server->tcpStatus == CifsNeedNegotiate)
429 mod_delayed_work(cifsiod_wq, &server->echo, 0);
430
431 return rc;
432 }
433
434 static void
435 cifs_echo_request(struct work_struct *work)
436 {
437 int rc;
438 struct TCP_Server_Info *server = container_of(work,
439 struct TCP_Server_Info, echo.work);
440 unsigned long echo_interval;
441
442 /*
443 * If we need to renegotiate, set echo interval to zero to
444 * immediately call echo service where we can renegotiate.
445 */
446 if (server->tcpStatus == CifsNeedNegotiate)
447 echo_interval = 0;
448 else
449 echo_interval = server->echo_interval;
450
451 /*
452 * We cannot send an echo if it is disabled.
453 * Also, no need to ping if we got a response recently.
454 */
455
456 if (server->tcpStatus == CifsNeedReconnect ||
457 server->tcpStatus == CifsExiting ||
458 server->tcpStatus == CifsNew ||
459 (server->ops->can_echo && !server->ops->can_echo(server)) ||
460 time_before(jiffies, server->lstrp + echo_interval - HZ))
461 goto requeue_echo;
462
463 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
464 if (rc)
465 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
466 server->hostname);
467
468 requeue_echo:
469 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
470 }
471
472 static bool
473 allocate_buffers(struct TCP_Server_Info *server)
474 {
475 if (!server->bigbuf) {
476 server->bigbuf = (char *)cifs_buf_get();
477 if (!server->bigbuf) {
478 cifs_dbg(VFS, "No memory for large SMB response\n");
479 msleep(3000);
480 /* retry will check if exiting */
481 return false;
482 }
483 } else if (server->large_buf) {
484 /* we are reusing a dirty large buf, clear its start */
485 memset(server->bigbuf, 0, HEADER_SIZE(server));
486 }
487
488 if (!server->smallbuf) {
489 server->smallbuf = (char *)cifs_small_buf_get();
490 if (!server->smallbuf) {
491 cifs_dbg(VFS, "No memory for SMB response\n");
492 msleep(1000);
493 /* retry will check if exiting */
494 return false;
495 }
496 /* beginning of smb buffer is cleared in our buf_get */
497 } else {
498 /* if existing small buf clear beginning */
499 memset(server->smallbuf, 0, HEADER_SIZE(server));
500 }
501
502 return true;
503 }
504
505 static bool
506 server_unresponsive(struct TCP_Server_Info *server)
507 {
508 /*
509 * We need to wait 2 echo intervals to make sure we handle such
510 * situations right:
511 * 1s client sends a normal SMB request
512 * 2s client gets a response
513 * 30s echo workqueue job pops, and decides we got a response recently
514 * and don't need to send another
515 * ...
516 * 65s kernel_recvmsg times out, and we see that we haven't gotten
517 * a response in >60s.
518 */
519 if ((server->tcpStatus == CifsGood ||
520 server->tcpStatus == CifsNeedNegotiate) &&
521 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
522 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
523 server->hostname, (2 * server->echo_interval) / HZ);
524 cifs_reconnect(server);
525 wake_up(&server->response_q);
526 return true;
527 }
528
529 return false;
530 }
531
532 static int
533 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
534 {
535 int length = 0;
536 int total_read;
537
538 smb_msg->msg_control = NULL;
539 smb_msg->msg_controllen = 0;
540
541 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
542 try_to_freeze();
543
544 if (server_unresponsive(server))
545 return -ECONNABORTED;
546 if (cifs_rdma_enabled(server) && server->smbd_conn)
547 length = smbd_recv(server->smbd_conn, smb_msg);
548 else
549 length = sock_recvmsg(server->ssocket, smb_msg, 0);
550
551 if (server->tcpStatus == CifsExiting)
552 return -ESHUTDOWN;
553
554 if (server->tcpStatus == CifsNeedReconnect) {
555 cifs_reconnect(server);
556 return -ECONNABORTED;
557 }
558
559 if (length == -ERESTARTSYS ||
560 length == -EAGAIN ||
561 length == -EINTR) {
562 /*
563 * Minimum sleep to prevent looping, allowing socket
564 * to clear and app threads to set tcpStatus
565 * CifsNeedReconnect if server hung.
566 */
567 usleep_range(1000, 2000);
568 length = 0;
569 continue;
570 }
571
572 if (length <= 0) {
573 cifs_dbg(FYI, "Received no data or error: %d\n", length);
574 cifs_reconnect(server);
575 return -ECONNABORTED;
576 }
577 }
578 return total_read;
579 }
580
581 int
582 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
583 unsigned int to_read)
584 {
585 struct msghdr smb_msg;
586 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
587 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
588
589 return cifs_readv_from_socket(server, &smb_msg);
590 }
591
592 int
593 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
594 unsigned int to_read)
595 {
596 struct msghdr smb_msg;
597 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
598 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
599 return cifs_readv_from_socket(server, &smb_msg);
600 }
601
602 static bool
603 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
604 {
605 /*
606 * The first byte big endian of the length field,
607 * is actually not part of the length but the type
608 * with the most common, zero, as regular data.
609 */
610 switch (type) {
611 case RFC1002_SESSION_MESSAGE:
612 /* Regular SMB response */
613 return true;
614 case RFC1002_SESSION_KEEP_ALIVE:
615 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
616 break;
617 case RFC1002_POSITIVE_SESSION_RESPONSE:
618 cifs_dbg(FYI, "RFC 1002 positive session response\n");
619 break;
620 case RFC1002_NEGATIVE_SESSION_RESPONSE:
621 /*
622 * We get this from Windows 98 instead of an error on
623 * SMB negprot response.
624 */
625 cifs_dbg(FYI, "RFC 1002 negative session response\n");
626 /* give server a second to clean up */
627 msleep(1000);
628 /*
629 * Always try 445 first on reconnect since we get NACK
630 * on some if we ever connected to port 139 (the NACK
631 * is since we do not begin with RFC1001 session
632 * initialize frame).
633 */
634 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
635 cifs_reconnect(server);
636 wake_up(&server->response_q);
637 break;
638 default:
639 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
640 cifs_reconnect(server);
641 }
642
643 return false;
644 }
645
646 void
647 dequeue_mid(struct mid_q_entry *mid, bool malformed)
648 {
649 #ifdef CONFIG_CIFS_STATS2
650 mid->when_received = jiffies;
651 #endif
652 spin_lock(&GlobalMid_Lock);
653 if (!malformed)
654 mid->mid_state = MID_RESPONSE_RECEIVED;
655 else
656 mid->mid_state = MID_RESPONSE_MALFORMED;
657 list_del_init(&mid->qhead);
658 spin_unlock(&GlobalMid_Lock);
659 }
660
661 static void
662 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
663 char *buf, int malformed)
664 {
665 if (server->ops->check_trans2 &&
666 server->ops->check_trans2(mid, server, buf, malformed))
667 return;
668 mid->resp_buf = buf;
669 mid->large_buf = server->large_buf;
670 /* Was previous buf put in mpx struct for multi-rsp? */
671 if (!mid->multiRsp) {
672 /* smb buffer will be freed by user thread */
673 if (server->large_buf)
674 server->bigbuf = NULL;
675 else
676 server->smallbuf = NULL;
677 }
678 dequeue_mid(mid, malformed);
679 }
680
681 static void clean_demultiplex_info(struct TCP_Server_Info *server)
682 {
683 int length;
684
685 /* take it off the list, if it's not already */
686 spin_lock(&cifs_tcp_ses_lock);
687 list_del_init(&server->tcp_ses_list);
688 spin_unlock(&cifs_tcp_ses_lock);
689
690 spin_lock(&GlobalMid_Lock);
691 server->tcpStatus = CifsExiting;
692 spin_unlock(&GlobalMid_Lock);
693 wake_up_all(&server->response_q);
694
695 /* check if we have blocked requests that need to free */
696 spin_lock(&server->req_lock);
697 if (server->credits <= 0)
698 server->credits = 1;
699 spin_unlock(&server->req_lock);
700 /*
701 * Although there should not be any requests blocked on this queue it
702 * can not hurt to be paranoid and try to wake up requests that may
703 * haven been blocked when more than 50 at time were on the wire to the
704 * same server - they now will see the session is in exit state and get
705 * out of SendReceive.
706 */
707 wake_up_all(&server->request_q);
708 /* give those requests time to exit */
709 msleep(125);
710 if (cifs_rdma_enabled(server) && server->smbd_conn) {
711 smbd_destroy(server->smbd_conn);
712 server->smbd_conn = NULL;
713 }
714 if (server->ssocket) {
715 sock_release(server->ssocket);
716 server->ssocket = NULL;
717 }
718
719 if (!list_empty(&server->pending_mid_q)) {
720 struct list_head dispose_list;
721 struct mid_q_entry *mid_entry;
722 struct list_head *tmp, *tmp2;
723
724 INIT_LIST_HEAD(&dispose_list);
725 spin_lock(&GlobalMid_Lock);
726 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
727 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
728 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
729 mid_entry->mid_state = MID_SHUTDOWN;
730 list_move(&mid_entry->qhead, &dispose_list);
731 }
732 spin_unlock(&GlobalMid_Lock);
733
734 /* now walk dispose list and issue callbacks */
735 list_for_each_safe(tmp, tmp2, &dispose_list) {
736 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
737 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
738 list_del_init(&mid_entry->qhead);
739 mid_entry->callback(mid_entry);
740 }
741 /* 1/8th of sec is more than enough time for them to exit */
742 msleep(125);
743 }
744
745 if (!list_empty(&server->pending_mid_q)) {
746 /*
747 * mpx threads have not exited yet give them at least the smb
748 * send timeout time for long ops.
749 *
750 * Due to delays on oplock break requests, we need to wait at
751 * least 45 seconds before giving up on a request getting a
752 * response and going ahead and killing cifsd.
753 */
754 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
755 msleep(46000);
756 /*
757 * If threads still have not exited they are probably never
758 * coming home not much else we can do but free the memory.
759 */
760 }
761
762 kfree(server->hostname);
763 kfree(server);
764
765 length = atomic_dec_return(&tcpSesAllocCount);
766 if (length > 0)
767 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
768 }
769
770 static int
771 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
772 {
773 int length;
774 char *buf = server->smallbuf;
775 unsigned int pdu_length = get_rfc1002_length(buf);
776
777 /* make sure this will fit in a large buffer */
778 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
779 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
780 cifs_reconnect(server);
781 wake_up(&server->response_q);
782 return -ECONNABORTED;
783 }
784
785 /* switch to large buffer if too big for a small one */
786 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
787 server->large_buf = true;
788 memcpy(server->bigbuf, buf, server->total_read);
789 buf = server->bigbuf;
790 }
791
792 /* now read the rest */
793 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
794 pdu_length - HEADER_SIZE(server) + 1 + 4);
795 if (length < 0)
796 return length;
797 server->total_read += length;
798
799 dump_smb(buf, server->total_read);
800
801 return cifs_handle_standard(server, mid);
802 }
803
804 int
805 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
806 {
807 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
808 int length;
809
810 /*
811 * We know that we received enough to get to the MID as we
812 * checked the pdu_length earlier. Now check to see
813 * if the rest of the header is OK. We borrow the length
814 * var for the rest of the loop to avoid a new stack var.
815 *
816 * 48 bytes is enough to display the header and a little bit
817 * into the payload for debugging purposes.
818 */
819 length = server->ops->check_message(buf, server->total_read, server);
820 if (length != 0)
821 cifs_dump_mem("Bad SMB: ", buf,
822 min_t(unsigned int, server->total_read, 48));
823
824 if (server->ops->is_session_expired &&
825 server->ops->is_session_expired(buf)) {
826 cifs_reconnect(server);
827 wake_up(&server->response_q);
828 return -1;
829 }
830
831 if (server->ops->is_status_pending &&
832 server->ops->is_status_pending(buf, server, length))
833 return -1;
834
835 if (!mid)
836 return length;
837
838 handle_mid(mid, server, buf, length);
839 return 0;
840 }
841
842 static int
843 cifs_demultiplex_thread(void *p)
844 {
845 int length;
846 struct TCP_Server_Info *server = p;
847 unsigned int pdu_length;
848 char *buf = NULL;
849 struct task_struct *task_to_wake = NULL;
850 struct mid_q_entry *mid_entry;
851
852 current->flags |= PF_MEMALLOC;
853 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
854
855 length = atomic_inc_return(&tcpSesAllocCount);
856 if (length > 1)
857 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
858
859 set_freezable();
860 while (server->tcpStatus != CifsExiting) {
861 if (try_to_freeze())
862 continue;
863
864 if (!allocate_buffers(server))
865 continue;
866
867 server->large_buf = false;
868 buf = server->smallbuf;
869 pdu_length = 4; /* enough to get RFC1001 header */
870
871 length = cifs_read_from_socket(server, buf, pdu_length);
872 if (length < 0)
873 continue;
874 server->total_read = length;
875
876 /*
877 * The right amount was read from socket - 4 bytes,
878 * so we can now interpret the length field.
879 */
880 pdu_length = get_rfc1002_length(buf);
881
882 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
883 if (!is_smb_response(server, buf[0]))
884 continue;
885
886 /* make sure we have enough to get to the MID */
887 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
888 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
889 pdu_length);
890 cifs_reconnect(server);
891 wake_up(&server->response_q);
892 continue;
893 }
894
895 /* read down to the MID */
896 length = cifs_read_from_socket(server, buf + 4,
897 HEADER_SIZE(server) - 1 - 4);
898 if (length < 0)
899 continue;
900 server->total_read += length;
901
902 if (server->ops->is_transform_hdr &&
903 server->ops->receive_transform &&
904 server->ops->is_transform_hdr(buf)) {
905 length = server->ops->receive_transform(server,
906 &mid_entry);
907 } else {
908 mid_entry = server->ops->find_mid(server, buf);
909
910 if (!mid_entry || !mid_entry->receive)
911 length = standard_receive3(server, mid_entry);
912 else
913 length = mid_entry->receive(server, mid_entry);
914 }
915
916 if (length < 0)
917 continue;
918
919 if (server->large_buf)
920 buf = server->bigbuf;
921
922 server->lstrp = jiffies;
923 if (mid_entry != NULL) {
924 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
925 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
926 server->ops->handle_cancelled_mid)
927 server->ops->handle_cancelled_mid(
928 mid_entry->resp_buf,
929 server);
930
931 if (!mid_entry->multiRsp || mid_entry->multiEnd)
932 mid_entry->callback(mid_entry);
933 } else if (server->ops->is_oplock_break &&
934 server->ops->is_oplock_break(buf, server)) {
935 cifs_dbg(FYI, "Received oplock break\n");
936 } else {
937 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
938 atomic_read(&midCount));
939 cifs_dump_mem("Received Data is: ", buf,
940 HEADER_SIZE(server));
941 #ifdef CONFIG_CIFS_DEBUG2
942 if (server->ops->dump_detail)
943 server->ops->dump_detail(buf);
944 cifs_dump_mids(server);
945 #endif /* CIFS_DEBUG2 */
946
947 }
948 } /* end while !EXITING */
949
950 /* buffer usually freed in free_mid - need to free it here on exit */
951 cifs_buf_release(server->bigbuf);
952 if (server->smallbuf) /* no sense logging a debug message if NULL */
953 cifs_small_buf_release(server->smallbuf);
954
955 task_to_wake = xchg(&server->tsk, NULL);
956 clean_demultiplex_info(server);
957
958 /* if server->tsk was NULL then wait for a signal before exiting */
959 if (!task_to_wake) {
960 set_current_state(TASK_INTERRUPTIBLE);
961 while (!signal_pending(current)) {
962 schedule();
963 set_current_state(TASK_INTERRUPTIBLE);
964 }
965 set_current_state(TASK_RUNNING);
966 }
967
968 module_put_and_exit(0);
969 }
970
971 /* extract the host portion of the UNC string */
972 static char *
973 extract_hostname(const char *unc)
974 {
975 const char *src;
976 char *dst, *delim;
977 unsigned int len;
978
979 /* skip double chars at beginning of string */
980 /* BB: check validity of these bytes? */
981 src = unc + 2;
982
983 /* delimiter between hostname and sharename is always '\\' now */
984 delim = strchr(src, '\\');
985 if (!delim)
986 return ERR_PTR(-EINVAL);
987
988 len = delim - src;
989 dst = kmalloc((len + 1), GFP_KERNEL);
990 if (dst == NULL)
991 return ERR_PTR(-ENOMEM);
992
993 memcpy(dst, src, len);
994 dst[len] = '\0';
995
996 return dst;
997 }
998
999 static int get_option_ul(substring_t args[], unsigned long *option)
1000 {
1001 int rc;
1002 char *string;
1003
1004 string = match_strdup(args);
1005 if (string == NULL)
1006 return -ENOMEM;
1007 rc = kstrtoul(string, 0, option);
1008 kfree(string);
1009
1010 return rc;
1011 }
1012
1013 static int get_option_uid(substring_t args[], kuid_t *result)
1014 {
1015 unsigned long value;
1016 kuid_t uid;
1017 int rc;
1018
1019 rc = get_option_ul(args, &value);
1020 if (rc)
1021 return rc;
1022
1023 uid = make_kuid(current_user_ns(), value);
1024 if (!uid_valid(uid))
1025 return -EINVAL;
1026
1027 *result = uid;
1028 return 0;
1029 }
1030
1031 static int get_option_gid(substring_t args[], kgid_t *result)
1032 {
1033 unsigned long value;
1034 kgid_t gid;
1035 int rc;
1036
1037 rc = get_option_ul(args, &value);
1038 if (rc)
1039 return rc;
1040
1041 gid = make_kgid(current_user_ns(), value);
1042 if (!gid_valid(gid))
1043 return -EINVAL;
1044
1045 *result = gid;
1046 return 0;
1047 }
1048
1049 static int cifs_parse_security_flavors(char *value,
1050 struct smb_vol *vol)
1051 {
1052
1053 substring_t args[MAX_OPT_ARGS];
1054
1055 /*
1056 * With mount options, the last one should win. Reset any existing
1057 * settings back to default.
1058 */
1059 vol->sectype = Unspecified;
1060 vol->sign = false;
1061
1062 switch (match_token(value, cifs_secflavor_tokens, args)) {
1063 case Opt_sec_krb5p:
1064 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1065 return 1;
1066 case Opt_sec_krb5i:
1067 vol->sign = true;
1068 /* Fallthrough */
1069 case Opt_sec_krb5:
1070 vol->sectype = Kerberos;
1071 break;
1072 case Opt_sec_ntlmsspi:
1073 vol->sign = true;
1074 /* Fallthrough */
1075 case Opt_sec_ntlmssp:
1076 vol->sectype = RawNTLMSSP;
1077 break;
1078 case Opt_sec_ntlmi:
1079 vol->sign = true;
1080 /* Fallthrough */
1081 case Opt_ntlm:
1082 vol->sectype = NTLM;
1083 break;
1084 case Opt_sec_ntlmv2i:
1085 vol->sign = true;
1086 /* Fallthrough */
1087 case Opt_sec_ntlmv2:
1088 vol->sectype = NTLMv2;
1089 break;
1090 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1091 case Opt_sec_lanman:
1092 vol->sectype = LANMAN;
1093 break;
1094 #endif
1095 case Opt_sec_none:
1096 vol->nullauth = 1;
1097 break;
1098 default:
1099 cifs_dbg(VFS, "bad security option: %s\n", value);
1100 return 1;
1101 }
1102
1103 return 0;
1104 }
1105
1106 static int
1107 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1108 {
1109 substring_t args[MAX_OPT_ARGS];
1110
1111 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1112 case Opt_cache_loose:
1113 vol->direct_io = false;
1114 vol->strict_io = false;
1115 break;
1116 case Opt_cache_strict:
1117 vol->direct_io = false;
1118 vol->strict_io = true;
1119 break;
1120 case Opt_cache_none:
1121 vol->direct_io = true;
1122 vol->strict_io = false;
1123 break;
1124 default:
1125 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1126 return 1;
1127 }
1128 return 0;
1129 }
1130
1131 static int
1132 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1133 {
1134 substring_t args[MAX_OPT_ARGS];
1135
1136 switch (match_token(value, cifs_smb_version_tokens, args)) {
1137 case Smb_1:
1138 vol->ops = &smb1_operations;
1139 vol->vals = &smb1_values;
1140 break;
1141 case Smb_20:
1142 vol->ops = &smb20_operations;
1143 vol->vals = &smb20_values;
1144 break;
1145 case Smb_21:
1146 vol->ops = &smb21_operations;
1147 vol->vals = &smb21_values;
1148 break;
1149 case Smb_30:
1150 vol->ops = &smb30_operations;
1151 vol->vals = &smb30_values;
1152 break;
1153 case Smb_302:
1154 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1155 vol->vals = &smb302_values;
1156 break;
1157 #ifdef CONFIG_CIFS_SMB311
1158 case Smb_311:
1159 vol->ops = &smb311_operations;
1160 vol->vals = &smb311_values;
1161 break;
1162 #endif /* SMB311 */
1163 case Smb_3any:
1164 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1165 vol->vals = &smb3any_values;
1166 break;
1167 case Smb_default:
1168 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1169 vol->vals = &smbdefault_values;
1170 break;
1171 default:
1172 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1173 return 1;
1174 }
1175 return 0;
1176 }
1177
1178 /*
1179 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1180 * fields with the result. Returns 0 on success and an error otherwise.
1181 */
1182 static int
1183 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1184 {
1185 char *pos;
1186 const char *delims = "/\\";
1187 size_t len;
1188
1189 /* make sure we have a valid UNC double delimiter prefix */
1190 len = strspn(devname, delims);
1191 if (len != 2)
1192 return -EINVAL;
1193
1194 /* find delimiter between host and sharename */
1195 pos = strpbrk(devname + 2, delims);
1196 if (!pos)
1197 return -EINVAL;
1198
1199 /* skip past delimiter */
1200 ++pos;
1201
1202 /* now go until next delimiter or end of string */
1203 len = strcspn(pos, delims);
1204
1205 /* move "pos" up to delimiter or NULL */
1206 pos += len;
1207 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1208 if (!vol->UNC)
1209 return -ENOMEM;
1210
1211 convert_delimiter(vol->UNC, '\\');
1212
1213 /* skip any delimiter */
1214 if (*pos == '/' || *pos == '\\')
1215 pos++;
1216
1217 /* If pos is NULL then no prepath */
1218 if (!*pos)
1219 return 0;
1220
1221 vol->prepath = kstrdup(pos, GFP_KERNEL);
1222 if (!vol->prepath)
1223 return -ENOMEM;
1224
1225 return 0;
1226 }
1227
1228 static int
1229 cifs_parse_mount_options(const char *mountdata, const char *devname,
1230 struct smb_vol *vol)
1231 {
1232 char *data, *end;
1233 char *mountdata_copy = NULL, *options;
1234 unsigned int temp_len, i, j;
1235 char separator[2];
1236 short int override_uid = -1;
1237 short int override_gid = -1;
1238 bool uid_specified = false;
1239 bool gid_specified = false;
1240 bool sloppy = false;
1241 char *invalid = NULL;
1242 char *nodename = utsname()->nodename;
1243 char *string = NULL;
1244 char *tmp_end, *value;
1245 char delim;
1246 bool got_ip = false;
1247 bool got_version = false;
1248 unsigned short port = 0;
1249 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1250
1251 separator[0] = ',';
1252 separator[1] = 0;
1253 delim = separator[0];
1254
1255 /* ensure we always start with zeroed-out smb_vol */
1256 memset(vol, 0, sizeof(*vol));
1257
1258 /*
1259 * does not have to be perfect mapping since field is
1260 * informational, only used for servers that do not support
1261 * port 445 and it can be overridden at mount time
1262 */
1263 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1264 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1265 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1266
1267 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1268 /* null target name indicates to use *SMBSERVR default called name
1269 if we end up sending RFC1001 session initialize */
1270 vol->target_rfc1001_name[0] = 0;
1271 vol->cred_uid = current_uid();
1272 vol->linux_uid = current_uid();
1273 vol->linux_gid = current_gid();
1274
1275 /*
1276 * default to SFM style remapping of seven reserved characters
1277 * unless user overrides it or we negotiate CIFS POSIX where
1278 * it is unnecessary. Can not simultaneously use more than one mapping
1279 * since then readdir could list files that open could not open
1280 */
1281 vol->remap = true;
1282
1283 /* default to only allowing write access to owner of the mount */
1284 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1285
1286 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1287 /* default is always to request posix paths. */
1288 vol->posix_paths = 1;
1289 /* default to using server inode numbers where available */
1290 vol->server_ino = 1;
1291
1292 /* default is to use strict cifs caching semantics */
1293 vol->strict_io = true;
1294
1295 vol->actimeo = CIFS_DEF_ACTIMEO;
1296
1297 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1298 vol->ops = &smb30_operations;
1299 vol->vals = &smbdefault_values;
1300
1301 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1302
1303 if (!mountdata)
1304 goto cifs_parse_mount_err;
1305
1306 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1307 if (!mountdata_copy)
1308 goto cifs_parse_mount_err;
1309
1310 options = mountdata_copy;
1311 end = options + strlen(options);
1312
1313 if (strncmp(options, "sep=", 4) == 0) {
1314 if (options[4] != 0) {
1315 separator[0] = options[4];
1316 options += 5;
1317 } else {
1318 cifs_dbg(FYI, "Null separator not allowed\n");
1319 }
1320 }
1321 vol->backupuid_specified = false; /* no backup intent for a user */
1322 vol->backupgid_specified = false; /* no backup intent for a group */
1323
1324 switch (cifs_parse_devname(devname, vol)) {
1325 case 0:
1326 break;
1327 case -ENOMEM:
1328 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1329 goto cifs_parse_mount_err;
1330 case -EINVAL:
1331 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1332 goto cifs_parse_mount_err;
1333 default:
1334 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1335 goto cifs_parse_mount_err;
1336 }
1337
1338 while ((data = strsep(&options, separator)) != NULL) {
1339 substring_t args[MAX_OPT_ARGS];
1340 unsigned long option;
1341 int token;
1342
1343 if (!*data)
1344 continue;
1345
1346 token = match_token(data, cifs_mount_option_tokens, args);
1347
1348 switch (token) {
1349
1350 /* Ingnore the following */
1351 case Opt_ignore:
1352 break;
1353
1354 /* Boolean values */
1355 case Opt_user_xattr:
1356 vol->no_xattr = 0;
1357 break;
1358 case Opt_nouser_xattr:
1359 vol->no_xattr = 1;
1360 break;
1361 case Opt_forceuid:
1362 override_uid = 1;
1363 break;
1364 case Opt_noforceuid:
1365 override_uid = 0;
1366 break;
1367 case Opt_forcegid:
1368 override_gid = 1;
1369 break;
1370 case Opt_noforcegid:
1371 override_gid = 0;
1372 break;
1373 case Opt_noblocksend:
1374 vol->noblocksnd = 1;
1375 break;
1376 case Opt_noautotune:
1377 vol->noautotune = 1;
1378 break;
1379 case Opt_hard:
1380 vol->retry = 1;
1381 break;
1382 case Opt_soft:
1383 vol->retry = 0;
1384 break;
1385 case Opt_perm:
1386 vol->noperm = 0;
1387 break;
1388 case Opt_noperm:
1389 vol->noperm = 1;
1390 break;
1391 case Opt_mapchars:
1392 vol->sfu_remap = true;
1393 vol->remap = false; /* disable SFM mapping */
1394 break;
1395 case Opt_nomapchars:
1396 vol->sfu_remap = false;
1397 break;
1398 case Opt_mapposix:
1399 vol->remap = true;
1400 vol->sfu_remap = false; /* disable SFU mapping */
1401 break;
1402 case Opt_nomapposix:
1403 vol->remap = false;
1404 break;
1405 case Opt_sfu:
1406 vol->sfu_emul = 1;
1407 break;
1408 case Opt_nosfu:
1409 vol->sfu_emul = 0;
1410 break;
1411 case Opt_nodfs:
1412 vol->nodfs = 1;
1413 break;
1414 case Opt_posixpaths:
1415 vol->posix_paths = 1;
1416 break;
1417 case Opt_noposixpaths:
1418 vol->posix_paths = 0;
1419 break;
1420 case Opt_nounix:
1421 vol->no_linux_ext = 1;
1422 break;
1423 case Opt_nocase:
1424 vol->nocase = 1;
1425 break;
1426 case Opt_brl:
1427 vol->nobrl = 0;
1428 break;
1429 case Opt_nobrl:
1430 vol->nobrl = 1;
1431 /*
1432 * turn off mandatory locking in mode
1433 * if remote locking is turned off since the
1434 * local vfs will do advisory
1435 */
1436 if (vol->file_mode ==
1437 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1438 vol->file_mode = S_IALLUGO;
1439 break;
1440 case Opt_forcemandatorylock:
1441 vol->mand_lock = 1;
1442 break;
1443 case Opt_setuids:
1444 vol->setuids = 1;
1445 break;
1446 case Opt_nosetuids:
1447 vol->setuids = 0;
1448 break;
1449 case Opt_setuidfromacl:
1450 vol->setuidfromacl = 1;
1451 break;
1452 case Opt_dynperm:
1453 vol->dynperm = true;
1454 break;
1455 case Opt_nodynperm:
1456 vol->dynperm = false;
1457 break;
1458 case Opt_nohard:
1459 vol->retry = 0;
1460 break;
1461 case Opt_nosoft:
1462 vol->retry = 1;
1463 break;
1464 case Opt_nointr:
1465 vol->intr = 0;
1466 break;
1467 case Opt_intr:
1468 vol->intr = 1;
1469 break;
1470 case Opt_nostrictsync:
1471 vol->nostrictsync = 1;
1472 break;
1473 case Opt_strictsync:
1474 vol->nostrictsync = 0;
1475 break;
1476 case Opt_serverino:
1477 vol->server_ino = 1;
1478 break;
1479 case Opt_noserverino:
1480 vol->server_ino = 0;
1481 break;
1482 case Opt_rwpidforward:
1483 vol->rwpidforward = 1;
1484 break;
1485 case Opt_cifsacl:
1486 vol->cifs_acl = 1;
1487 break;
1488 case Opt_nocifsacl:
1489 vol->cifs_acl = 0;
1490 break;
1491 case Opt_acl:
1492 vol->no_psx_acl = 0;
1493 break;
1494 case Opt_noacl:
1495 vol->no_psx_acl = 1;
1496 break;
1497 case Opt_locallease:
1498 vol->local_lease = 1;
1499 break;
1500 case Opt_sign:
1501 vol->sign = true;
1502 break;
1503 case Opt_seal:
1504 /* we do not do the following in secFlags because seal
1505 * is a per tree connection (mount) not a per socket
1506 * or per-smb connection option in the protocol
1507 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1508 */
1509 vol->seal = 1;
1510 break;
1511 case Opt_noac:
1512 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1513 break;
1514 case Opt_fsc:
1515 #ifndef CONFIG_CIFS_FSCACHE
1516 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1517 goto cifs_parse_mount_err;
1518 #endif
1519 vol->fsc = true;
1520 break;
1521 case Opt_mfsymlinks:
1522 vol->mfsymlinks = true;
1523 break;
1524 case Opt_multiuser:
1525 vol->multiuser = true;
1526 break;
1527 case Opt_sloppy:
1528 sloppy = true;
1529 break;
1530 case Opt_nosharesock:
1531 vol->nosharesock = true;
1532 break;
1533 case Opt_nopersistent:
1534 vol->nopersistent = true;
1535 if (vol->persistent) {
1536 cifs_dbg(VFS,
1537 "persistenthandles mount options conflict\n");
1538 goto cifs_parse_mount_err;
1539 }
1540 break;
1541 case Opt_persistent:
1542 vol->persistent = true;
1543 if ((vol->nopersistent) || (vol->resilient)) {
1544 cifs_dbg(VFS,
1545 "persistenthandles mount options conflict\n");
1546 goto cifs_parse_mount_err;
1547 }
1548 break;
1549 case Opt_resilient:
1550 vol->resilient = true;
1551 if (vol->persistent) {
1552 cifs_dbg(VFS,
1553 "persistenthandles mount options conflict\n");
1554 goto cifs_parse_mount_err;
1555 }
1556 break;
1557 case Opt_noresilient:
1558 vol->resilient = false; /* already the default */
1559 break;
1560 case Opt_domainauto:
1561 vol->domainauto = true;
1562 break;
1563 case Opt_rdma:
1564 vol->rdma = true;
1565 break;
1566
1567 /* Numeric Values */
1568 case Opt_backupuid:
1569 if (get_option_uid(args, &vol->backupuid)) {
1570 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1571 __func__);
1572 goto cifs_parse_mount_err;
1573 }
1574 vol->backupuid_specified = true;
1575 break;
1576 case Opt_backupgid:
1577 if (get_option_gid(args, &vol->backupgid)) {
1578 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1579 __func__);
1580 goto cifs_parse_mount_err;
1581 }
1582 vol->backupgid_specified = true;
1583 break;
1584 case Opt_uid:
1585 if (get_option_uid(args, &vol->linux_uid)) {
1586 cifs_dbg(VFS, "%s: Invalid uid value\n",
1587 __func__);
1588 goto cifs_parse_mount_err;
1589 }
1590 uid_specified = true;
1591 break;
1592 case Opt_cruid:
1593 if (get_option_uid(args, &vol->cred_uid)) {
1594 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1595 __func__);
1596 goto cifs_parse_mount_err;
1597 }
1598 break;
1599 case Opt_gid:
1600 if (get_option_gid(args, &vol->linux_gid)) {
1601 cifs_dbg(VFS, "%s: Invalid gid value\n",
1602 __func__);
1603 goto cifs_parse_mount_err;
1604 }
1605 gid_specified = true;
1606 break;
1607 case Opt_file_mode:
1608 if (get_option_ul(args, &option)) {
1609 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1610 __func__);
1611 goto cifs_parse_mount_err;
1612 }
1613 vol->file_mode = option;
1614 break;
1615 case Opt_dirmode:
1616 if (get_option_ul(args, &option)) {
1617 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1618 __func__);
1619 goto cifs_parse_mount_err;
1620 }
1621 vol->dir_mode = option;
1622 break;
1623 case Opt_port:
1624 if (get_option_ul(args, &option) ||
1625 option > USHRT_MAX) {
1626 cifs_dbg(VFS, "%s: Invalid port value\n",
1627 __func__);
1628 goto cifs_parse_mount_err;
1629 }
1630 port = (unsigned short)option;
1631 break;
1632 case Opt_rsize:
1633 if (get_option_ul(args, &option)) {
1634 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1635 __func__);
1636 goto cifs_parse_mount_err;
1637 }
1638 vol->rsize = option;
1639 break;
1640 case Opt_wsize:
1641 if (get_option_ul(args, &option)) {
1642 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1643 __func__);
1644 goto cifs_parse_mount_err;
1645 }
1646 vol->wsize = option;
1647 break;
1648 case Opt_actimeo:
1649 if (get_option_ul(args, &option)) {
1650 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1651 __func__);
1652 goto cifs_parse_mount_err;
1653 }
1654 vol->actimeo = HZ * option;
1655 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1656 cifs_dbg(VFS, "attribute cache timeout too large\n");
1657 goto cifs_parse_mount_err;
1658 }
1659 break;
1660 case Opt_echo_interval:
1661 if (get_option_ul(args, &option)) {
1662 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1663 __func__);
1664 goto cifs_parse_mount_err;
1665 }
1666 vol->echo_interval = option;
1667 break;
1668 case Opt_snapshot:
1669 if (get_option_ul(args, &option)) {
1670 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1671 __func__);
1672 goto cifs_parse_mount_err;
1673 }
1674 vol->snapshot_time = option;
1675 break;
1676 case Opt_max_credits:
1677 if (get_option_ul(args, &option) || (option < 20) ||
1678 (option > 60000)) {
1679 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1680 __func__);
1681 goto cifs_parse_mount_err;
1682 }
1683 vol->max_credits = option;
1684 break;
1685
1686 /* String Arguments */
1687
1688 case Opt_blank_user:
1689 /* null user, ie. anonymous authentication */
1690 vol->nullauth = 1;
1691 vol->username = NULL;
1692 break;
1693 case Opt_user:
1694 string = match_strdup(args);
1695 if (string == NULL)
1696 goto out_nomem;
1697
1698 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1699 CIFS_MAX_USERNAME_LEN) {
1700 pr_warn("CIFS: username too long\n");
1701 goto cifs_parse_mount_err;
1702 }
1703
1704 kfree(vol->username);
1705 vol->username = kstrdup(string, GFP_KERNEL);
1706 if (!vol->username)
1707 goto cifs_parse_mount_err;
1708 break;
1709 case Opt_blank_pass:
1710 /* passwords have to be handled differently
1711 * to allow the character used for deliminator
1712 * to be passed within them
1713 */
1714
1715 /*
1716 * Check if this is a case where the password
1717 * starts with a delimiter
1718 */
1719 tmp_end = strchr(data, '=');
1720 tmp_end++;
1721 if (!(tmp_end < end && tmp_end[1] == delim)) {
1722 /* No it is not. Set the password to NULL */
1723 kzfree(vol->password);
1724 vol->password = NULL;
1725 break;
1726 }
1727 /* Yes it is. Drop down to Opt_pass below.*/
1728 case Opt_pass:
1729 /* Obtain the value string */
1730 value = strchr(data, '=');
1731 value++;
1732
1733 /* Set tmp_end to end of the string */
1734 tmp_end = (char *) value + strlen(value);
1735
1736 /* Check if following character is the deliminator
1737 * If yes, we have encountered a double deliminator
1738 * reset the NULL character to the deliminator
1739 */
1740 if (tmp_end < end && tmp_end[1] == delim) {
1741 tmp_end[0] = delim;
1742
1743 /* Keep iterating until we get to a single
1744 * deliminator OR the end
1745 */
1746 while ((tmp_end = strchr(tmp_end, delim))
1747 != NULL && (tmp_end[1] == delim)) {
1748 tmp_end = (char *) &tmp_end[2];
1749 }
1750
1751 /* Reset var options to point to next element */
1752 if (tmp_end) {
1753 tmp_end[0] = '\0';
1754 options = (char *) &tmp_end[1];
1755 } else
1756 /* Reached the end of the mount option
1757 * string */
1758 options = end;
1759 }
1760
1761 kzfree(vol->password);
1762 /* Now build new password string */
1763 temp_len = strlen(value);
1764 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1765 if (vol->password == NULL) {
1766 pr_warn("CIFS: no memory for password\n");
1767 goto cifs_parse_mount_err;
1768 }
1769
1770 for (i = 0, j = 0; i < temp_len; i++, j++) {
1771 vol->password[j] = value[i];
1772 if ((value[i] == delim) &&
1773 value[i+1] == delim)
1774 /* skip the second deliminator */
1775 i++;
1776 }
1777 vol->password[j] = '\0';
1778 break;
1779 case Opt_blank_ip:
1780 /* FIXME: should this be an error instead? */
1781 got_ip = false;
1782 break;
1783 case Opt_ip:
1784 string = match_strdup(args);
1785 if (string == NULL)
1786 goto out_nomem;
1787
1788 if (!cifs_convert_address(dstaddr, string,
1789 strlen(string))) {
1790 pr_err("CIFS: bad ip= option (%s).\n", string);
1791 goto cifs_parse_mount_err;
1792 }
1793 got_ip = true;
1794 break;
1795 case Opt_domain:
1796 string = match_strdup(args);
1797 if (string == NULL)
1798 goto out_nomem;
1799
1800 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1801 == CIFS_MAX_DOMAINNAME_LEN) {
1802 pr_warn("CIFS: domain name too long\n");
1803 goto cifs_parse_mount_err;
1804 }
1805
1806 kfree(vol->domainname);
1807 vol->domainname = kstrdup(string, GFP_KERNEL);
1808 if (!vol->domainname) {
1809 pr_warn("CIFS: no memory for domainname\n");
1810 goto cifs_parse_mount_err;
1811 }
1812 cifs_dbg(FYI, "Domain name set\n");
1813 break;
1814 case Opt_srcaddr:
1815 string = match_strdup(args);
1816 if (string == NULL)
1817 goto out_nomem;
1818
1819 if (!cifs_convert_address(
1820 (struct sockaddr *)&vol->srcaddr,
1821 string, strlen(string))) {
1822 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1823 string);
1824 goto cifs_parse_mount_err;
1825 }
1826 break;
1827 case Opt_iocharset:
1828 string = match_strdup(args);
1829 if (string == NULL)
1830 goto out_nomem;
1831
1832 if (strnlen(string, 1024) >= 65) {
1833 pr_warn("CIFS: iocharset name too long.\n");
1834 goto cifs_parse_mount_err;
1835 }
1836
1837 if (strncasecmp(string, "default", 7) != 0) {
1838 kfree(vol->iocharset);
1839 vol->iocharset = kstrdup(string,
1840 GFP_KERNEL);
1841 if (!vol->iocharset) {
1842 pr_warn("CIFS: no memory for charset\n");
1843 goto cifs_parse_mount_err;
1844 }
1845 }
1846 /* if iocharset not set then load_nls_default
1847 * is used by caller
1848 */
1849 cifs_dbg(FYI, "iocharset set to %s\n", string);
1850 break;
1851 case Opt_netbiosname:
1852 string = match_strdup(args);
1853 if (string == NULL)
1854 goto out_nomem;
1855
1856 memset(vol->source_rfc1001_name, 0x20,
1857 RFC1001_NAME_LEN);
1858 /*
1859 * FIXME: are there cases in which a comma can
1860 * be valid in workstation netbios name (and
1861 * need special handling)?
1862 */
1863 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1864 /* don't ucase netbiosname for user */
1865 if (string[i] == 0)
1866 break;
1867 vol->source_rfc1001_name[i] = string[i];
1868 }
1869 /* The string has 16th byte zero still from
1870 * set at top of the function
1871 */
1872 if (i == RFC1001_NAME_LEN && string[i] != 0)
1873 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1874 break;
1875 case Opt_servern:
1876 /* servernetbiosname specified override *SMBSERVER */
1877 string = match_strdup(args);
1878 if (string == NULL)
1879 goto out_nomem;
1880
1881 /* last byte, type, is 0x20 for servr type */
1882 memset(vol->target_rfc1001_name, 0x20,
1883 RFC1001_NAME_LEN_WITH_NULL);
1884
1885 /* BB are there cases in which a comma can be
1886 valid in this workstation netbios name
1887 (and need special handling)? */
1888
1889 /* user or mount helper must uppercase the
1890 netbios name */
1891 for (i = 0; i < 15; i++) {
1892 if (string[i] == 0)
1893 break;
1894 vol->target_rfc1001_name[i] = string[i];
1895 }
1896 /* The string has 16th byte zero still from
1897 set at top of the function */
1898 if (i == RFC1001_NAME_LEN && string[i] != 0)
1899 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1900 break;
1901 case Opt_ver:
1902 /* version of mount userspace tools, not dialect */
1903 string = match_strdup(args);
1904 if (string == NULL)
1905 goto out_nomem;
1906
1907 /* If interface changes in mount.cifs bump to new ver */
1908 if (strncasecmp(string, "1", 1) == 0) {
1909 if (strlen(string) > 1) {
1910 pr_warn("Bad mount helper ver=%s. Did "
1911 "you want SMB1 (CIFS) dialect "
1912 "and mean to type vers=1.0 "
1913 "instead?\n", string);
1914 goto cifs_parse_mount_err;
1915 }
1916 /* This is the default */
1917 break;
1918 }
1919 /* For all other value, error */
1920 pr_warn("CIFS: Invalid mount helper version specified\n");
1921 goto cifs_parse_mount_err;
1922 case Opt_vers:
1923 /* protocol version (dialect) */
1924 string = match_strdup(args);
1925 if (string == NULL)
1926 goto out_nomem;
1927
1928 if (cifs_parse_smb_version(string, vol) != 0)
1929 goto cifs_parse_mount_err;
1930 got_version = true;
1931 break;
1932 case Opt_sec:
1933 string = match_strdup(args);
1934 if (string == NULL)
1935 goto out_nomem;
1936
1937 if (cifs_parse_security_flavors(string, vol) != 0)
1938 goto cifs_parse_mount_err;
1939 break;
1940 case Opt_cache:
1941 string = match_strdup(args);
1942 if (string == NULL)
1943 goto out_nomem;
1944
1945 if (cifs_parse_cache_flavor(string, vol) != 0)
1946 goto cifs_parse_mount_err;
1947 break;
1948 default:
1949 /*
1950 * An option we don't recognize. Save it off for later
1951 * if we haven't already found one
1952 */
1953 if (!invalid)
1954 invalid = data;
1955 break;
1956 }
1957 /* Free up any allocated string */
1958 kfree(string);
1959 string = NULL;
1960 }
1961
1962 if (!sloppy && invalid) {
1963 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1964 goto cifs_parse_mount_err;
1965 }
1966
1967 if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
1968 cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
1969 goto cifs_parse_mount_err;
1970 }
1971
1972 #ifdef CONFIG_CIFS_SMB_DIRECT
1973 if (vol->rdma && vol->sign) {
1974 cifs_dbg(VFS, "Currently SMB direct doesn't support signing."
1975 " This is being fixed\n");
1976 goto cifs_parse_mount_err;
1977 }
1978 #endif
1979
1980 #ifndef CONFIG_KEYS
1981 /* Muliuser mounts require CONFIG_KEYS support */
1982 if (vol->multiuser) {
1983 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1984 goto cifs_parse_mount_err;
1985 }
1986 #endif
1987 if (!vol->UNC) {
1988 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1989 goto cifs_parse_mount_err;
1990 }
1991
1992 /* make sure UNC has a share name */
1993 if (!strchr(vol->UNC + 3, '\\')) {
1994 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1995 goto cifs_parse_mount_err;
1996 }
1997
1998 if (!got_ip) {
1999 int len;
2000 const char *slash;
2001
2002 /* No ip= option specified? Try to get it from UNC */
2003 /* Use the address part of the UNC. */
2004 slash = strchr(&vol->UNC[2], '\\');
2005 len = slash - &vol->UNC[2];
2006 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
2007 pr_err("Unable to determine destination address.\n");
2008 goto cifs_parse_mount_err;
2009 }
2010 }
2011
2012 /* set the port that we got earlier */
2013 cifs_set_port(dstaddr, port);
2014
2015 if (uid_specified)
2016 vol->override_uid = override_uid;
2017 else if (override_uid == 1)
2018 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
2019
2020 if (gid_specified)
2021 vol->override_gid = override_gid;
2022 else if (override_gid == 1)
2023 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
2024
2025 if (got_version == false)
2026 pr_warn("No dialect specified on mount. Default has changed to "
2027 "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
2028 "(SMB1). To use the less secure SMB1 dialect to access "
2029 "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
2030 " on mount.\n");
2031
2032 kfree(mountdata_copy);
2033 return 0;
2034
2035 out_nomem:
2036 pr_warn("Could not allocate temporary buffer\n");
2037 cifs_parse_mount_err:
2038 kfree(string);
2039 kfree(mountdata_copy);
2040 return 1;
2041 }
2042
2043 /** Returns true if srcaddr isn't specified and rhs isn't
2044 * specified, or if srcaddr is specified and
2045 * matches the IP address of the rhs argument.
2046 */
2047 static bool
2048 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2049 {
2050 switch (srcaddr->sa_family) {
2051 case AF_UNSPEC:
2052 return (rhs->sa_family == AF_UNSPEC);
2053 case AF_INET: {
2054 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2055 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2056 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2057 }
2058 case AF_INET6: {
2059 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2060 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2061 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2062 }
2063 default:
2064 WARN_ON(1);
2065 return false; /* don't expect to be here */
2066 }
2067 }
2068
2069 /*
2070 * If no port is specified in addr structure, we try to match with 445 port
2071 * and if it fails - with 139 ports. It should be called only if address
2072 * families of server and addr are equal.
2073 */
2074 static bool
2075 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2076 {
2077 __be16 port, *sport;
2078
2079 switch (addr->sa_family) {
2080 case AF_INET:
2081 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2082 port = ((struct sockaddr_in *) addr)->sin_port;
2083 break;
2084 case AF_INET6:
2085 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2086 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2087 break;
2088 default:
2089 WARN_ON(1);
2090 return false;
2091 }
2092
2093 if (!port) {
2094 port = htons(CIFS_PORT);
2095 if (port == *sport)
2096 return true;
2097
2098 port = htons(RFC1001_PORT);
2099 }
2100
2101 return port == *sport;
2102 }
2103
2104 static bool
2105 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2106 struct sockaddr *srcaddr)
2107 {
2108 switch (addr->sa_family) {
2109 case AF_INET: {
2110 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2111 struct sockaddr_in *srv_addr4 =
2112 (struct sockaddr_in *)&server->dstaddr;
2113
2114 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2115 return false;
2116 break;
2117 }
2118 case AF_INET6: {
2119 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2120 struct sockaddr_in6 *srv_addr6 =
2121 (struct sockaddr_in6 *)&server->dstaddr;
2122
2123 if (!ipv6_addr_equal(&addr6->sin6_addr,
2124 &srv_addr6->sin6_addr))
2125 return false;
2126 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2127 return false;
2128 break;
2129 }
2130 default:
2131 WARN_ON(1);
2132 return false; /* don't expect to be here */
2133 }
2134
2135 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2136 return false;
2137
2138 return true;
2139 }
2140
2141 static bool
2142 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2143 {
2144 /*
2145 * The select_sectype function should either return the vol->sectype
2146 * that was specified, or "Unspecified" if that sectype was not
2147 * compatible with the given NEGOTIATE request.
2148 */
2149 if (server->ops->select_sectype(server, vol->sectype)
2150 == Unspecified)
2151 return false;
2152
2153 /*
2154 * Now check if signing mode is acceptable. No need to check
2155 * global_secflags at this point since if MUST_SIGN is set then
2156 * the server->sign had better be too.
2157 */
2158 if (vol->sign && !server->sign)
2159 return false;
2160
2161 return true;
2162 }
2163
2164 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2165 {
2166 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2167
2168 if (vol->nosharesock)
2169 return 0;
2170
2171 /* BB update this for smb3any and default case */
2172 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2173 return 0;
2174
2175 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2176 return 0;
2177
2178 if (!match_address(server, addr,
2179 (struct sockaddr *)&vol->srcaddr))
2180 return 0;
2181
2182 if (!match_port(server, addr))
2183 return 0;
2184
2185 if (!match_security(server, vol))
2186 return 0;
2187
2188 if (server->echo_interval != vol->echo_interval * HZ)
2189 return 0;
2190
2191 if (server->rdma != vol->rdma)
2192 return 0;
2193
2194 return 1;
2195 }
2196
2197 static struct TCP_Server_Info *
2198 cifs_find_tcp_session(struct smb_vol *vol)
2199 {
2200 struct TCP_Server_Info *server;
2201
2202 spin_lock(&cifs_tcp_ses_lock);
2203 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2204 if (!match_server(server, vol))
2205 continue;
2206
2207 ++server->srv_count;
2208 spin_unlock(&cifs_tcp_ses_lock);
2209 cifs_dbg(FYI, "Existing tcp session with server found\n");
2210 return server;
2211 }
2212 spin_unlock(&cifs_tcp_ses_lock);
2213 return NULL;
2214 }
2215
2216 void
2217 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2218 {
2219 struct task_struct *task;
2220
2221 spin_lock(&cifs_tcp_ses_lock);
2222 if (--server->srv_count > 0) {
2223 spin_unlock(&cifs_tcp_ses_lock);
2224 return;
2225 }
2226
2227 put_net(cifs_net_ns(server));
2228
2229 list_del_init(&server->tcp_ses_list);
2230 spin_unlock(&cifs_tcp_ses_lock);
2231
2232 cancel_delayed_work_sync(&server->echo);
2233
2234 if (from_reconnect)
2235 /*
2236 * Avoid deadlock here: reconnect work calls
2237 * cifs_put_tcp_session() at its end. Need to be sure
2238 * that reconnect work does nothing with server pointer after
2239 * that step.
2240 */
2241 cancel_delayed_work(&server->reconnect);
2242 else
2243 cancel_delayed_work_sync(&server->reconnect);
2244
2245 spin_lock(&GlobalMid_Lock);
2246 server->tcpStatus = CifsExiting;
2247 spin_unlock(&GlobalMid_Lock);
2248
2249 cifs_crypto_secmech_release(server);
2250 cifs_fscache_release_client_cookie(server);
2251
2252 kfree(server->session_key.response);
2253 server->session_key.response = NULL;
2254 server->session_key.len = 0;
2255
2256 task = xchg(&server->tsk, NULL);
2257 if (task)
2258 force_sig(SIGKILL, task);
2259 }
2260
2261 static struct TCP_Server_Info *
2262 cifs_get_tcp_session(struct smb_vol *volume_info)
2263 {
2264 struct TCP_Server_Info *tcp_ses = NULL;
2265 int rc;
2266
2267 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2268
2269 /* see if we already have a matching tcp_ses */
2270 tcp_ses = cifs_find_tcp_session(volume_info);
2271 if (tcp_ses)
2272 return tcp_ses;
2273
2274 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2275 if (!tcp_ses) {
2276 rc = -ENOMEM;
2277 goto out_err;
2278 }
2279
2280 tcp_ses->ops = volume_info->ops;
2281 tcp_ses->vals = volume_info->vals;
2282 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2283 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2284 if (IS_ERR(tcp_ses->hostname)) {
2285 rc = PTR_ERR(tcp_ses->hostname);
2286 goto out_err_crypto_release;
2287 }
2288
2289 tcp_ses->noblocksnd = volume_info->noblocksnd;
2290 tcp_ses->noautotune = volume_info->noautotune;
2291 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2292 tcp_ses->rdma = volume_info->rdma;
2293 tcp_ses->in_flight = 0;
2294 tcp_ses->credits = 1;
2295 init_waitqueue_head(&tcp_ses->response_q);
2296 init_waitqueue_head(&tcp_ses->request_q);
2297 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2298 mutex_init(&tcp_ses->srv_mutex);
2299 memcpy(tcp_ses->workstation_RFC1001_name,
2300 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2301 memcpy(tcp_ses->server_RFC1001_name,
2302 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2303 tcp_ses->session_estab = false;
2304 tcp_ses->sequence_number = 0;
2305 tcp_ses->lstrp = jiffies;
2306 spin_lock_init(&tcp_ses->req_lock);
2307 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2308 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2309 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2310 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2311 mutex_init(&tcp_ses->reconnect_mutex);
2312 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2313 sizeof(tcp_ses->srcaddr));
2314 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2315 sizeof(tcp_ses->dstaddr));
2316 generate_random_uuid(tcp_ses->client_guid);
2317 /*
2318 * at this point we are the only ones with the pointer
2319 * to the struct since the kernel thread not created yet
2320 * no need to spinlock this init of tcpStatus or srv_count
2321 */
2322 tcp_ses->tcpStatus = CifsNew;
2323 ++tcp_ses->srv_count;
2324
2325 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2326 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2327 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2328 else
2329 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2330 if (tcp_ses->rdma) {
2331 #ifndef CONFIG_CIFS_SMB_DIRECT
2332 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
2333 rc = -ENOENT;
2334 goto out_err_crypto_release;
2335 #endif
2336 tcp_ses->smbd_conn = smbd_get_connection(
2337 tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
2338 if (tcp_ses->smbd_conn) {
2339 cifs_dbg(VFS, "RDMA transport established\n");
2340 rc = 0;
2341 goto smbd_connected;
2342 } else {
2343 rc = -ENOENT;
2344 goto out_err_crypto_release;
2345 }
2346 }
2347 rc = ip_connect(tcp_ses);
2348 if (rc < 0) {
2349 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2350 goto out_err_crypto_release;
2351 }
2352 smbd_connected:
2353 /*
2354 * since we're in a cifs function already, we know that
2355 * this will succeed. No need for try_module_get().
2356 */
2357 __module_get(THIS_MODULE);
2358 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2359 tcp_ses, "cifsd");
2360 if (IS_ERR(tcp_ses->tsk)) {
2361 rc = PTR_ERR(tcp_ses->tsk);
2362 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2363 module_put(THIS_MODULE);
2364 goto out_err_crypto_release;
2365 }
2366 tcp_ses->tcpStatus = CifsNeedNegotiate;
2367
2368 /* thread spawned, put it on the list */
2369 spin_lock(&cifs_tcp_ses_lock);
2370 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2371 spin_unlock(&cifs_tcp_ses_lock);
2372
2373 cifs_fscache_get_client_cookie(tcp_ses);
2374
2375 /* queue echo request delayed work */
2376 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2377
2378 return tcp_ses;
2379
2380 out_err_crypto_release:
2381 cifs_crypto_secmech_release(tcp_ses);
2382
2383 put_net(cifs_net_ns(tcp_ses));
2384
2385 out_err:
2386 if (tcp_ses) {
2387 if (!IS_ERR(tcp_ses->hostname))
2388 kfree(tcp_ses->hostname);
2389 if (tcp_ses->ssocket)
2390 sock_release(tcp_ses->ssocket);
2391 kfree(tcp_ses);
2392 }
2393 return ERR_PTR(rc);
2394 }
2395
2396 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2397 {
2398 if (vol->sectype != Unspecified &&
2399 vol->sectype != ses->sectype)
2400 return 0;
2401
2402 switch (ses->sectype) {
2403 case Kerberos:
2404 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2405 return 0;
2406 break;
2407 default:
2408 /* NULL username means anonymous session */
2409 if (ses->user_name == NULL) {
2410 if (!vol->nullauth)
2411 return 0;
2412 break;
2413 }
2414
2415 /* anything else takes username/password */
2416 if (strncmp(ses->user_name,
2417 vol->username ? vol->username : "",
2418 CIFS_MAX_USERNAME_LEN))
2419 return 0;
2420 if ((vol->username && strlen(vol->username) != 0) &&
2421 ses->password != NULL &&
2422 strncmp(ses->password,
2423 vol->password ? vol->password : "",
2424 CIFS_MAX_PASSWORD_LEN))
2425 return 0;
2426 }
2427 return 1;
2428 }
2429
2430 /**
2431 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2432 *
2433 * A new IPC connection is made and stored in the session
2434 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2435 */
2436 static int
2437 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2438 {
2439 int rc = 0, xid;
2440 struct cifs_tcon *tcon;
2441 struct nls_table *nls_codepage;
2442 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2443 bool seal = false;
2444
2445 /*
2446 * If the mount request that resulted in the creation of the
2447 * session requires encryption, force IPC to be encrypted too.
2448 */
2449 if (volume_info->seal) {
2450 if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2451 seal = true;
2452 else {
2453 cifs_dbg(VFS,
2454 "IPC: server doesn't support encryption\n");
2455 return -EOPNOTSUPP;
2456 }
2457 }
2458
2459 tcon = tconInfoAlloc();
2460 if (tcon == NULL)
2461 return -ENOMEM;
2462
2463 snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
2464
2465 /* cannot fail */
2466 nls_codepage = load_nls_default();
2467
2468 xid = get_xid();
2469 tcon->ses = ses;
2470 tcon->ipc = true;
2471 tcon->seal = seal;
2472 rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2473 free_xid(xid);
2474
2475 if (rc) {
2476 cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2477 tconInfoFree(tcon);
2478 goto out;
2479 }
2480
2481 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2482
2483 ses->tcon_ipc = tcon;
2484 out:
2485 unload_nls(nls_codepage);
2486 return rc;
2487 }
2488
2489 /**
2490 * cifs_free_ipc - helper to release the session IPC tcon
2491 *
2492 * Needs to be called everytime a session is destroyed
2493 */
2494 static int
2495 cifs_free_ipc(struct cifs_ses *ses)
2496 {
2497 int rc = 0, xid;
2498 struct cifs_tcon *tcon = ses->tcon_ipc;
2499
2500 if (tcon == NULL)
2501 return 0;
2502
2503 if (ses->server->ops->tree_disconnect) {
2504 xid = get_xid();
2505 rc = ses->server->ops->tree_disconnect(xid, tcon);
2506 free_xid(xid);
2507 }
2508
2509 if (rc)
2510 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2511
2512 tconInfoFree(tcon);
2513 ses->tcon_ipc = NULL;
2514 return rc;
2515 }
2516
2517 static struct cifs_ses *
2518 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2519 {
2520 struct cifs_ses *ses;
2521
2522 spin_lock(&cifs_tcp_ses_lock);
2523 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2524 if (ses->status == CifsExiting)
2525 continue;
2526 if (!match_session(ses, vol))
2527 continue;
2528 ++ses->ses_count;
2529 spin_unlock(&cifs_tcp_ses_lock);
2530 return ses;
2531 }
2532 spin_unlock(&cifs_tcp_ses_lock);
2533 return NULL;
2534 }
2535
2536 static void
2537 cifs_put_smb_ses(struct cifs_ses *ses)
2538 {
2539 unsigned int rc, xid;
2540 struct TCP_Server_Info *server = ses->server;
2541
2542 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2543
2544 spin_lock(&cifs_tcp_ses_lock);
2545 if (ses->status == CifsExiting) {
2546 spin_unlock(&cifs_tcp_ses_lock);
2547 return;
2548 }
2549 if (--ses->ses_count > 0) {
2550 spin_unlock(&cifs_tcp_ses_lock);
2551 return;
2552 }
2553 if (ses->status == CifsGood)
2554 ses->status = CifsExiting;
2555 spin_unlock(&cifs_tcp_ses_lock);
2556
2557 cifs_free_ipc(ses);
2558
2559 if (ses->status == CifsExiting && server->ops->logoff) {
2560 xid = get_xid();
2561 rc = server->ops->logoff(xid, ses);
2562 if (rc)
2563 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2564 __func__, rc);
2565 _free_xid(xid);
2566 }
2567
2568 spin_lock(&cifs_tcp_ses_lock);
2569 list_del_init(&ses->smb_ses_list);
2570 spin_unlock(&cifs_tcp_ses_lock);
2571
2572 sesInfoFree(ses);
2573 cifs_put_tcp_session(server, 0);
2574 }
2575
2576 #ifdef CONFIG_KEYS
2577
2578 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2579 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2580
2581 /* Populate username and pw fields from keyring if possible */
2582 static int
2583 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2584 {
2585 int rc = 0;
2586 const char *delim, *payload;
2587 char *desc;
2588 ssize_t len;
2589 struct key *key;
2590 struct TCP_Server_Info *server = ses->server;
2591 struct sockaddr_in *sa;
2592 struct sockaddr_in6 *sa6;
2593 const struct user_key_payload *upayload;
2594
2595 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2596 if (!desc)
2597 return -ENOMEM;
2598
2599 /* try to find an address key first */
2600 switch (server->dstaddr.ss_family) {
2601 case AF_INET:
2602 sa = (struct sockaddr_in *)&server->dstaddr;
2603 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2604 break;
2605 case AF_INET6:
2606 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2607 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2608 break;
2609 default:
2610 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2611 server->dstaddr.ss_family);
2612 rc = -EINVAL;
2613 goto out_err;
2614 }
2615
2616 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2617 key = request_key(&key_type_logon, desc, "");
2618 if (IS_ERR(key)) {
2619 if (!ses->domainName) {
2620 cifs_dbg(FYI, "domainName is NULL\n");
2621 rc = PTR_ERR(key);
2622 goto out_err;
2623 }
2624
2625 /* didn't work, try to find a domain key */
2626 sprintf(desc, "cifs:d:%s", ses->domainName);
2627 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2628 key = request_key(&key_type_logon, desc, "");
2629 if (IS_ERR(key)) {
2630 rc = PTR_ERR(key);
2631 goto out_err;
2632 }
2633 }
2634
2635 down_read(&key->sem);
2636 upayload = user_key_payload_locked(key);
2637 if (IS_ERR_OR_NULL(upayload)) {
2638 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2639 goto out_key_put;
2640 }
2641
2642 /* find first : in payload */
2643 payload = upayload->data;
2644 delim = strnchr(payload, upayload->datalen, ':');
2645 cifs_dbg(FYI, "payload=%s\n", payload);
2646 if (!delim) {
2647 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2648 upayload->datalen);
2649 rc = -EINVAL;
2650 goto out_key_put;
2651 }
2652
2653 len = delim - payload;
2654 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2655 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2656 len);
2657 rc = -EINVAL;
2658 goto out_key_put;
2659 }
2660
2661 vol->username = kstrndup(payload, len, GFP_KERNEL);
2662 if (!vol->username) {
2663 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2664 len);
2665 rc = -ENOMEM;
2666 goto out_key_put;
2667 }
2668 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2669
2670 len = key->datalen - (len + 1);
2671 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2672 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2673 rc = -EINVAL;
2674 kfree(vol->username);
2675 vol->username = NULL;
2676 goto out_key_put;
2677 }
2678
2679 ++delim;
2680 vol->password = kstrndup(delim, len, GFP_KERNEL);
2681 if (!vol->password) {
2682 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2683 len);
2684 rc = -ENOMEM;
2685 kfree(vol->username);
2686 vol->username = NULL;
2687 goto out_key_put;
2688 }
2689
2690 out_key_put:
2691 up_read(&key->sem);
2692 key_put(key);
2693 out_err:
2694 kfree(desc);
2695 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2696 return rc;
2697 }
2698 #else /* ! CONFIG_KEYS */
2699 static inline int
2700 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2701 struct cifs_ses *ses __attribute__((unused)))
2702 {
2703 return -ENOSYS;
2704 }
2705 #endif /* CONFIG_KEYS */
2706
2707 /**
2708 * cifs_get_smb_ses - get a session matching @volume_info data from @server
2709 *
2710 * This function assumes it is being called from cifs_mount() where we
2711 * already got a server reference (server refcount +1). See
2712 * cifs_get_tcon() for refcount explanations.
2713 */
2714 static struct cifs_ses *
2715 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2716 {
2717 int rc = -ENOMEM;
2718 unsigned int xid;
2719 struct cifs_ses *ses;
2720 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2721 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2722
2723 xid = get_xid();
2724
2725 ses = cifs_find_smb_ses(server, volume_info);
2726 if (ses) {
2727 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2728 ses->status);
2729
2730 mutex_lock(&ses->session_mutex);
2731 rc = cifs_negotiate_protocol(xid, ses);
2732 if (rc) {
2733 mutex_unlock(&ses->session_mutex);
2734 /* problem -- put our ses reference */
2735 cifs_put_smb_ses(ses);
2736 free_xid(xid);
2737 return ERR_PTR(rc);
2738 }
2739 if (ses->need_reconnect) {
2740 cifs_dbg(FYI, "Session needs reconnect\n");
2741 rc = cifs_setup_session(xid, ses,
2742 volume_info->local_nls);
2743 if (rc) {
2744 mutex_unlock(&ses->session_mutex);
2745 /* problem -- put our reference */
2746 cifs_put_smb_ses(ses);
2747 free_xid(xid);
2748 return ERR_PTR(rc);
2749 }
2750 }
2751 mutex_unlock(&ses->session_mutex);
2752
2753 /* existing SMB ses has a server reference already */
2754 cifs_put_tcp_session(server, 0);
2755 free_xid(xid);
2756 return ses;
2757 }
2758
2759 cifs_dbg(FYI, "Existing smb sess not found\n");
2760 ses = sesInfoAlloc();
2761 if (ses == NULL)
2762 goto get_ses_fail;
2763
2764 /* new SMB session uses our server ref */
2765 ses->server = server;
2766 if (server->dstaddr.ss_family == AF_INET6)
2767 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2768 else
2769 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2770
2771 if (volume_info->username) {
2772 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2773 if (!ses->user_name)
2774 goto get_ses_fail;
2775 }
2776
2777 /* volume_info->password freed at unmount */
2778 if (volume_info->password) {
2779 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2780 if (!ses->password)
2781 goto get_ses_fail;
2782 }
2783 if (volume_info->domainname) {
2784 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2785 if (!ses->domainName)
2786 goto get_ses_fail;
2787 }
2788 if (volume_info->domainauto)
2789 ses->domainAuto = volume_info->domainauto;
2790 ses->cred_uid = volume_info->cred_uid;
2791 ses->linux_uid = volume_info->linux_uid;
2792
2793 ses->sectype = volume_info->sectype;
2794 ses->sign = volume_info->sign;
2795
2796 mutex_lock(&ses->session_mutex);
2797 rc = cifs_negotiate_protocol(xid, ses);
2798 if (!rc)
2799 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2800 mutex_unlock(&ses->session_mutex);
2801 if (rc)
2802 goto get_ses_fail;
2803
2804 /* success, put it on the list */
2805 spin_lock(&cifs_tcp_ses_lock);
2806 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2807 spin_unlock(&cifs_tcp_ses_lock);
2808
2809 free_xid(xid);
2810
2811 cifs_setup_ipc(ses, volume_info);
2812
2813 return ses;
2814
2815 get_ses_fail:
2816 sesInfoFree(ses);
2817 free_xid(xid);
2818 return ERR_PTR(rc);
2819 }
2820
2821 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2822 {
2823 if (tcon->tidStatus == CifsExiting)
2824 return 0;
2825 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2826 return 0;
2827 if (tcon->seal != volume_info->seal)
2828 return 0;
2829 if (tcon->snapshot_time != volume_info->snapshot_time)
2830 return 0;
2831 return 1;
2832 }
2833
2834 static struct cifs_tcon *
2835 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2836 {
2837 struct list_head *tmp;
2838 struct cifs_tcon *tcon;
2839
2840 spin_lock(&cifs_tcp_ses_lock);
2841 list_for_each(tmp, &ses->tcon_list) {
2842 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2843 if (!match_tcon(tcon, volume_info))
2844 continue;
2845 ++tcon->tc_count;
2846 spin_unlock(&cifs_tcp_ses_lock);
2847 return tcon;
2848 }
2849 spin_unlock(&cifs_tcp_ses_lock);
2850 return NULL;
2851 }
2852
2853 void
2854 cifs_put_tcon(struct cifs_tcon *tcon)
2855 {
2856 unsigned int xid;
2857 struct cifs_ses *ses;
2858
2859 /*
2860 * IPC tcon share the lifetime of their session and are
2861 * destroyed in the session put function
2862 */
2863 if (tcon == NULL || tcon->ipc)
2864 return;
2865
2866 ses = tcon->ses;
2867 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2868 spin_lock(&cifs_tcp_ses_lock);
2869 if (--tcon->tc_count > 0) {
2870 spin_unlock(&cifs_tcp_ses_lock);
2871 return;
2872 }
2873
2874 list_del_init(&tcon->tcon_list);
2875 spin_unlock(&cifs_tcp_ses_lock);
2876
2877 xid = get_xid();
2878 if (ses->server->ops->tree_disconnect)
2879 ses->server->ops->tree_disconnect(xid, tcon);
2880 _free_xid(xid);
2881
2882 cifs_fscache_release_super_cookie(tcon);
2883 tconInfoFree(tcon);
2884 cifs_put_smb_ses(ses);
2885 }
2886
2887 /**
2888 * cifs_get_tcon - get a tcon matching @volume_info data from @ses
2889 *
2890 * - tcon refcount is the number of mount points using the tcon.
2891 * - ses refcount is the number of tcon using the session.
2892 *
2893 * 1. This function assumes it is being called from cifs_mount() where
2894 * we already got a session reference (ses refcount +1).
2895 *
2896 * 2. Since we're in the context of adding a mount point, the end
2897 * result should be either:
2898 *
2899 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2900 * its session refcount incremented (1 new tcon). This +1 was
2901 * already done in (1).
2902 *
2903 * b) an existing tcon with refcount+1 (add a mount point to it) and
2904 * identical ses refcount (no new tcon). Because of (1) we need to
2905 * decrement the ses refcount.
2906 */
2907 static struct cifs_tcon *
2908 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2909 {
2910 int rc, xid;
2911 struct cifs_tcon *tcon;
2912
2913 tcon = cifs_find_tcon(ses, volume_info);
2914 if (tcon) {
2915 /*
2916 * tcon has refcount already incremented but we need to
2917 * decrement extra ses reference gotten by caller (case b)
2918 */
2919 cifs_dbg(FYI, "Found match on UNC path\n");
2920 cifs_put_smb_ses(ses);
2921 return tcon;
2922 }
2923
2924 if (!ses->server->ops->tree_connect) {
2925 rc = -ENOSYS;
2926 goto out_fail;
2927 }
2928
2929 tcon = tconInfoAlloc();
2930 if (tcon == NULL) {
2931 rc = -ENOMEM;
2932 goto out_fail;
2933 }
2934
2935 if (volume_info->snapshot_time) {
2936 if (ses->server->vals->protocol_id == 0) {
2937 cifs_dbg(VFS,
2938 "Use SMB2 or later for snapshot mount option\n");
2939 rc = -EOPNOTSUPP;
2940 goto out_fail;
2941 } else
2942 tcon->snapshot_time = volume_info->snapshot_time;
2943 }
2944
2945 tcon->ses = ses;
2946 if (volume_info->password) {
2947 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2948 if (!tcon->password) {
2949 rc = -ENOMEM;
2950 goto out_fail;
2951 }
2952 }
2953
2954 /*
2955 * BB Do we need to wrap session_mutex around this TCon call and Unix
2956 * SetFS as we do on SessSetup and reconnect?
2957 */
2958 xid = get_xid();
2959 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2960 volume_info->local_nls);
2961 free_xid(xid);
2962 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2963 if (rc)
2964 goto out_fail;
2965
2966 if (volume_info->nodfs) {
2967 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2968 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2969 }
2970 tcon->use_persistent = false;
2971 /* check if SMB2 or later, CIFS does not support persistent handles */
2972 if (volume_info->persistent) {
2973 if (ses->server->vals->protocol_id == 0) {
2974 cifs_dbg(VFS,
2975 "SMB3 or later required for persistent handles\n");
2976 rc = -EOPNOTSUPP;
2977 goto out_fail;
2978 } else if (ses->server->capabilities &
2979 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2980 tcon->use_persistent = true;
2981 else /* persistent handles requested but not supported */ {
2982 cifs_dbg(VFS,
2983 "Persistent handles not supported on share\n");
2984 rc = -EOPNOTSUPP;
2985 goto out_fail;
2986 }
2987 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2988 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2989 && (volume_info->nopersistent == false)) {
2990 cifs_dbg(FYI, "enabling persistent handles\n");
2991 tcon->use_persistent = true;
2992 } else if (volume_info->resilient) {
2993 if (ses->server->vals->protocol_id == 0) {
2994 cifs_dbg(VFS,
2995 "SMB2.1 or later required for resilient handles\n");
2996 rc = -EOPNOTSUPP;
2997 goto out_fail;
2998 }
2999 tcon->use_resilient = true;
3000 }
3001
3002 if (volume_info->seal) {
3003 if (ses->server->vals->protocol_id == 0) {
3004 cifs_dbg(VFS,
3005 "SMB3 or later required for encryption\n");
3006 rc = -EOPNOTSUPP;
3007 goto out_fail;
3008 } else if (tcon->ses->server->capabilities &
3009 SMB2_GLOBAL_CAP_ENCRYPTION)
3010 tcon->seal = true;
3011 else {
3012 cifs_dbg(VFS, "Encryption is not supported on share\n");
3013 rc = -EOPNOTSUPP;
3014 goto out_fail;
3015 }
3016 }
3017
3018 /*
3019 * We can have only one retry value for a connection to a share so for
3020 * resources mounted more than once to the same server share the last
3021 * value passed in for the retry flag is used.
3022 */
3023 tcon->retry = volume_info->retry;
3024 tcon->nocase = volume_info->nocase;
3025 tcon->local_lease = volume_info->local_lease;
3026 INIT_LIST_HEAD(&tcon->pending_opens);
3027
3028 spin_lock(&cifs_tcp_ses_lock);
3029 list_add(&tcon->tcon_list, &ses->tcon_list);
3030 spin_unlock(&cifs_tcp_ses_lock);
3031
3032 cifs_fscache_get_super_cookie(tcon);
3033
3034 return tcon;
3035
3036 out_fail:
3037 tconInfoFree(tcon);
3038 return ERR_PTR(rc);
3039 }
3040
3041 void
3042 cifs_put_tlink(struct tcon_link *tlink)
3043 {
3044 if (!tlink || IS_ERR(tlink))
3045 return;
3046
3047 if (!atomic_dec_and_test(&tlink->tl_count) ||
3048 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
3049 tlink->tl_time = jiffies;
3050 return;
3051 }
3052
3053 if (!IS_ERR(tlink_tcon(tlink)))
3054 cifs_put_tcon(tlink_tcon(tlink));
3055 kfree(tlink);
3056 return;
3057 }
3058
3059 static inline struct tcon_link *
3060 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3061 {
3062 return cifs_sb->master_tlink;
3063 }
3064
3065 static int
3066 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3067 {
3068 struct cifs_sb_info *old = CIFS_SB(sb);
3069 struct cifs_sb_info *new = mnt_data->cifs_sb;
3070
3071 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
3072 return 0;
3073
3074 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
3075 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
3076 return 0;
3077
3078 /*
3079 * We want to share sb only if we don't specify an r/wsize or
3080 * specified r/wsize is greater than or equal to existing one.
3081 */
3082 if (new->wsize && new->wsize < old->wsize)
3083 return 0;
3084
3085 if (new->rsize && new->rsize < old->rsize)
3086 return 0;
3087
3088 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3089 return 0;
3090
3091 if (old->mnt_file_mode != new->mnt_file_mode ||
3092 old->mnt_dir_mode != new->mnt_dir_mode)
3093 return 0;
3094
3095 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3096 return 0;
3097
3098 if (old->actimeo != new->actimeo)
3099 return 0;
3100
3101 return 1;
3102 }
3103
3104 static int
3105 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3106 {
3107 struct cifs_sb_info *old = CIFS_SB(sb);
3108 struct cifs_sb_info *new = mnt_data->cifs_sb;
3109 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3110 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3111
3112 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3113 return 1;
3114 else if (!old_set && !new_set)
3115 return 1;
3116
3117 return 0;
3118 }
3119
3120 int
3121 cifs_match_super(struct super_block *sb, void *data)
3122 {
3123 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3124 struct smb_vol *volume_info;
3125 struct cifs_sb_info *cifs_sb;
3126 struct TCP_Server_Info *tcp_srv;
3127 struct cifs_ses *ses;
3128 struct cifs_tcon *tcon;
3129 struct tcon_link *tlink;
3130 int rc = 0;
3131
3132 spin_lock(&cifs_tcp_ses_lock);
3133 cifs_sb = CIFS_SB(sb);
3134 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3135 if (IS_ERR(tlink)) {
3136 spin_unlock(&cifs_tcp_ses_lock);
3137 return rc;
3138 }
3139 tcon = tlink_tcon(tlink);
3140 ses = tcon->ses;
3141 tcp_srv = ses->server;
3142
3143 volume_info = mnt_data->vol;
3144
3145 if (!match_server(tcp_srv, volume_info) ||
3146 !match_session(ses, volume_info) ||
3147 !match_tcon(tcon, volume_info) ||
3148 !match_prepath(sb, mnt_data)) {
3149 rc = 0;
3150 goto out;
3151 }
3152
3153 rc = compare_mount_options(sb, mnt_data);
3154 out:
3155 spin_unlock(&cifs_tcp_ses_lock);
3156 cifs_put_tlink(tlink);
3157 return rc;
3158 }
3159
3160 int
3161 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
3162 const struct nls_table *nls_codepage, unsigned int *num_referrals,
3163 struct dfs_info3_param **referrals, int remap)
3164 {
3165 int rc = 0;
3166
3167 if (!ses->server->ops->get_dfs_refer)
3168 return -ENOSYS;
3169
3170 *num_referrals = 0;
3171 *referrals = NULL;
3172
3173 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3174 referrals, num_referrals,
3175 nls_codepage, remap);
3176 return rc;
3177 }
3178
3179 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3180 static struct lock_class_key cifs_key[2];
3181 static struct lock_class_key cifs_slock_key[2];
3182
3183 static inline void
3184 cifs_reclassify_socket4(struct socket *sock)
3185 {
3186 struct sock *sk = sock->sk;
3187 BUG_ON(!sock_allow_reclassification(sk));
3188 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3189 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3190 }
3191
3192 static inline void
3193 cifs_reclassify_socket6(struct socket *sock)
3194 {
3195 struct sock *sk = sock->sk;
3196 BUG_ON(!sock_allow_reclassification(sk));
3197 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3198 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3199 }
3200 #else
3201 static inline void
3202 cifs_reclassify_socket4(struct socket *sock)
3203 {
3204 }
3205
3206 static inline void
3207 cifs_reclassify_socket6(struct socket *sock)
3208 {
3209 }
3210 #endif
3211
3212 /* See RFC1001 section 14 on representation of Netbios names */
3213 static void rfc1002mangle(char *target, char *source, unsigned int length)
3214 {
3215 unsigned int i, j;
3216
3217 for (i = 0, j = 0; i < (length); i++) {
3218 /* mask a nibble at a time and encode */
3219 target[j] = 'A' + (0x0F & (source[i] >> 4));
3220 target[j+1] = 'A' + (0x0F & source[i]);
3221 j += 2;
3222 }
3223
3224 }
3225
3226 static int
3227 bind_socket(struct TCP_Server_Info *server)
3228 {
3229 int rc = 0;
3230 if (server->srcaddr.ss_family != AF_UNSPEC) {
3231 /* Bind to the specified local IP address */
3232 struct socket *socket = server->ssocket;
3233 rc = socket->ops->bind(socket,
3234 (struct sockaddr *) &server->srcaddr,
3235 sizeof(server->srcaddr));
3236 if (rc < 0) {
3237 struct sockaddr_in *saddr4;
3238 struct sockaddr_in6 *saddr6;
3239 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3240 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3241 if (saddr6->sin6_family == AF_INET6)
3242 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3243 &saddr6->sin6_addr, rc);
3244 else
3245 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3246 &saddr4->sin_addr.s_addr, rc);
3247 }
3248 }
3249 return rc;
3250 }
3251
3252 static int
3253 ip_rfc1001_connect(struct TCP_Server_Info *server)
3254 {
3255 int rc = 0;
3256 /*
3257 * some servers require RFC1001 sessinit before sending
3258 * negprot - BB check reconnection in case where second
3259 * sessinit is sent but no second negprot
3260 */
3261 struct rfc1002_session_packet *ses_init_buf;
3262 struct smb_hdr *smb_buf;
3263 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3264 GFP_KERNEL);
3265 if (ses_init_buf) {
3266 ses_init_buf->trailer.session_req.called_len = 32;
3267
3268 if (server->server_RFC1001_name[0] != 0)
3269 rfc1002mangle(ses_init_buf->trailer.
3270 session_req.called_name,
3271 server->server_RFC1001_name,
3272 RFC1001_NAME_LEN_WITH_NULL);
3273 else
3274 rfc1002mangle(ses_init_buf->trailer.
3275 session_req.called_name,
3276 DEFAULT_CIFS_CALLED_NAME,
3277 RFC1001_NAME_LEN_WITH_NULL);
3278
3279 ses_init_buf->trailer.session_req.calling_len = 32;
3280
3281 /*
3282 * calling name ends in null (byte 16) from old smb
3283 * convention.
3284 */
3285 if (server->workstation_RFC1001_name[0] != 0)
3286 rfc1002mangle(ses_init_buf->trailer.
3287 session_req.calling_name,
3288 server->workstation_RFC1001_name,
3289 RFC1001_NAME_LEN_WITH_NULL);
3290 else
3291 rfc1002mangle(ses_init_buf->trailer.
3292 session_req.calling_name,
3293 "LINUX_CIFS_CLNT",
3294 RFC1001_NAME_LEN_WITH_NULL);
3295
3296 ses_init_buf->trailer.session_req.scope1 = 0;
3297 ses_init_buf->trailer.session_req.scope2 = 0;
3298 smb_buf = (struct smb_hdr *)ses_init_buf;
3299
3300 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3301 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3302 rc = smb_send(server, smb_buf, 0x44);
3303 kfree(ses_init_buf);
3304 /*
3305 * RFC1001 layer in at least one server
3306 * requires very short break before negprot
3307 * presumably because not expecting negprot
3308 * to follow so fast. This is a simple
3309 * solution that works without
3310 * complicating the code and causes no
3311 * significant slowing down on mount
3312 * for everyone else
3313 */
3314 usleep_range(1000, 2000);
3315 }
3316 /*
3317 * else the negprot may still work without this
3318 * even though malloc failed
3319 */
3320
3321 return rc;
3322 }
3323
3324 static int
3325 generic_ip_connect(struct TCP_Server_Info *server)
3326 {
3327 int rc = 0;
3328 __be16 sport;
3329 int slen, sfamily;
3330 struct socket *socket = server->ssocket;
3331 struct sockaddr *saddr;
3332
3333 saddr = (struct sockaddr *) &server->dstaddr;
3334
3335 if (server->dstaddr.ss_family == AF_INET6) {
3336 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3337 slen = sizeof(struct sockaddr_in6);
3338 sfamily = AF_INET6;
3339 } else {
3340 sport = ((struct sockaddr_in *) saddr)->sin_port;
3341 slen = sizeof(struct sockaddr_in);
3342 sfamily = AF_INET;
3343 }
3344
3345 if (socket == NULL) {
3346 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3347 IPPROTO_TCP, &socket, 1);
3348 if (rc < 0) {
3349 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3350 server->ssocket = NULL;
3351 return rc;
3352 }
3353
3354 /* BB other socket options to set KEEPALIVE, NODELAY? */
3355 cifs_dbg(FYI, "Socket created\n");
3356 server->ssocket = socket;
3357 socket->sk->sk_allocation = GFP_NOFS;
3358 if (sfamily == AF_INET6)
3359 cifs_reclassify_socket6(socket);
3360 else
3361 cifs_reclassify_socket4(socket);
3362 }
3363
3364 rc = bind_socket(server);
3365 if (rc < 0)
3366 return rc;
3367
3368 /*
3369 * Eventually check for other socket options to change from
3370 * the default. sock_setsockopt not used because it expects
3371 * user space buffer
3372 */
3373 socket->sk->sk_rcvtimeo = 7 * HZ;
3374 socket->sk->sk_sndtimeo = 5 * HZ;
3375
3376 /* make the bufsizes depend on wsize/rsize and max requests */
3377 if (server->noautotune) {
3378 if (socket->sk->sk_sndbuf < (200 * 1024))
3379 socket->sk->sk_sndbuf = 200 * 1024;
3380 if (socket->sk->sk_rcvbuf < (140 * 1024))
3381 socket->sk->sk_rcvbuf = 140 * 1024;
3382 }
3383
3384 if (server->tcp_nodelay) {
3385 int val = 1;
3386 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3387 (char *)&val, sizeof(val));
3388 if (rc)
3389 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3390 rc);
3391 }
3392
3393 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3394 socket->sk->sk_sndbuf,
3395 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3396
3397 rc = socket->ops->connect(socket, saddr, slen, 0);
3398 if (rc < 0) {
3399 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3400 sock_release(socket);
3401 server->ssocket = NULL;
3402 return rc;
3403 }
3404
3405 if (sport == htons(RFC1001_PORT))
3406 rc = ip_rfc1001_connect(server);
3407
3408 return rc;
3409 }
3410
3411 static int
3412 ip_connect(struct TCP_Server_Info *server)
3413 {
3414 __be16 *sport;
3415 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3416 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3417
3418 if (server->dstaddr.ss_family == AF_INET6)
3419 sport = &addr6->sin6_port;
3420 else
3421 sport = &addr->sin_port;
3422
3423 if (*sport == 0) {
3424 int rc;
3425
3426 /* try with 445 port at first */
3427 *sport = htons(CIFS_PORT);
3428
3429 rc = generic_ip_connect(server);
3430 if (rc >= 0)
3431 return rc;
3432
3433 /* if it failed, try with 139 port */
3434 *sport = htons(RFC1001_PORT);
3435 }
3436
3437 return generic_ip_connect(server);
3438 }
3439
3440 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3441 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3442 {
3443 /* if we are reconnecting then should we check to see if
3444 * any requested capabilities changed locally e.g. via
3445 * remount but we can not do much about it here
3446 * if they have (even if we could detect it by the following)
3447 * Perhaps we could add a backpointer to array of sb from tcon
3448 * or if we change to make all sb to same share the same
3449 * sb as NFS - then we only have one backpointer to sb.
3450 * What if we wanted to mount the server share twice once with
3451 * and once without posixacls or posix paths? */
3452 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3453
3454 if (vol_info && vol_info->no_linux_ext) {
3455 tcon->fsUnixInfo.Capability = 0;
3456 tcon->unix_ext = 0; /* Unix Extensions disabled */
3457 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3458 return;
3459 } else if (vol_info)
3460 tcon->unix_ext = 1; /* Unix Extensions supported */
3461
3462 if (tcon->unix_ext == 0) {
3463 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3464 return;
3465 }
3466
3467 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3468 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3469 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3470 /* check for reconnect case in which we do not
3471 want to change the mount behavior if we can avoid it */
3472 if (vol_info == NULL) {
3473 /* turn off POSIX ACL and PATHNAMES if not set
3474 originally at mount time */
3475 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3476 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3477 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3478 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3479 cifs_dbg(VFS, "POSIXPATH support change\n");
3480 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3481 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3482 cifs_dbg(VFS, "possible reconnect error\n");
3483 cifs_dbg(VFS, "server disabled POSIX path support\n");
3484 }
3485 }
3486
3487 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3488 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3489
3490 cap &= CIFS_UNIX_CAP_MASK;
3491 if (vol_info && vol_info->no_psx_acl)
3492 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3493 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3494 cifs_dbg(FYI, "negotiated posix acl support\n");
3495 if (cifs_sb)
3496 cifs_sb->mnt_cifs_flags |=
3497 CIFS_MOUNT_POSIXACL;
3498 }
3499
3500 if (vol_info && vol_info->posix_paths == 0)
3501 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3502 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3503 cifs_dbg(FYI, "negotiate posix pathnames\n");
3504 if (cifs_sb)
3505 cifs_sb->mnt_cifs_flags |=
3506 CIFS_MOUNT_POSIX_PATHS;
3507 }
3508
3509 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3510 #ifdef CONFIG_CIFS_DEBUG2
3511 if (cap & CIFS_UNIX_FCNTL_CAP)
3512 cifs_dbg(FYI, "FCNTL cap\n");
3513 if (cap & CIFS_UNIX_EXTATTR_CAP)
3514 cifs_dbg(FYI, "EXTATTR cap\n");
3515 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3516 cifs_dbg(FYI, "POSIX path cap\n");
3517 if (cap & CIFS_UNIX_XATTR_CAP)
3518 cifs_dbg(FYI, "XATTR cap\n");
3519 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3520 cifs_dbg(FYI, "POSIX ACL cap\n");
3521 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3522 cifs_dbg(FYI, "very large read cap\n");
3523 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3524 cifs_dbg(FYI, "very large write cap\n");
3525 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3526 cifs_dbg(FYI, "transport encryption cap\n");
3527 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3528 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3529 #endif /* CIFS_DEBUG2 */
3530 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3531 if (vol_info == NULL) {
3532 cifs_dbg(FYI, "resetting capabilities failed\n");
3533 } else
3534 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");
3535
3536 }
3537 }
3538 }
3539
3540 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3541 struct cifs_sb_info *cifs_sb)
3542 {
3543 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3544
3545 spin_lock_init(&cifs_sb->tlink_tree_lock);
3546 cifs_sb->tlink_tree = RB_ROOT;
3547
3548 /*
3549 * Temporarily set r/wsize for matching superblock. If we end up using
3550 * new sb then client will later negotiate it downward if needed.
3551 */
3552 cifs_sb->rsize = pvolume_info->rsize;
3553 cifs_sb->wsize = pvolume_info->wsize;
3554
3555 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3556 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3557 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3558 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3559 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3560 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3561
3562 cifs_sb->actimeo = pvolume_info->actimeo;
3563 cifs_sb->local_nls = pvolume_info->local_nls;
3564
3565 if (pvolume_info->noperm)
3566 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3567 if (pvolume_info->setuids)
3568 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3569 if (pvolume_info->setuidfromacl)
3570 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3571 if (pvolume_info->server_ino)
3572 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3573 if (pvolume_info->remap)
3574 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3575 if (pvolume_info->sfu_remap)
3576 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3577 if (pvolume_info->no_xattr)
3578 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3579 if (pvolume_info->sfu_emul)
3580 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3581 if (pvolume_info->nobrl)
3582 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3583 if (pvolume_info->nostrictsync)
3584 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3585 if (pvolume_info->mand_lock)
3586 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3587 if (pvolume_info->rwpidforward)
3588 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3589 if (pvolume_info->cifs_acl)
3590 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3591 if (pvolume_info->backupuid_specified) {
3592 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3593 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3594 }
3595 if (pvolume_info->backupgid_specified) {
3596 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3597 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3598 }
3599 if (pvolume_info->override_uid)
3600 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3601 if (pvolume_info->override_gid)
3602 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3603 if (pvolume_info->dynperm)
3604 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3605 if (pvolume_info->fsc)
3606 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3607 if (pvolume_info->multiuser)
3608 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3609 CIFS_MOUNT_NO_PERM);
3610 if (pvolume_info->strict_io)
3611 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3612 if (pvolume_info->direct_io) {
3613 cifs_dbg(FYI, "mounting share using direct i/o\n");
3614 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3615 }
3616 if (pvolume_info->mfsymlinks) {
3617 if (pvolume_info->sfu_emul) {
3618 /*
3619 * Our SFU ("Services for Unix" emulation does not allow
3620 * creating symlinks but does allow reading existing SFU
3621 * symlinks (it does allow both creating and reading SFU
3622 * style mknod and FIFOs though). When "mfsymlinks" and
3623 * "sfu" are both enabled at the same time, it allows
3624 * reading both types of symlinks, but will only create
3625 * them with mfsymlinks format. This allows better
3626 * Apple compatibility (probably better for Samba too)
3627 * while still recognizing old Windows style symlinks.
3628 */
3629 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3630 }
3631 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3632 }
3633
3634 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3635 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3636
3637 if (pvolume_info->prepath) {
3638 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3639 if (cifs_sb->prepath == NULL)
3640 return -ENOMEM;
3641 }
3642
3643 return 0;
3644 }
3645
3646 static void
3647 cleanup_volume_info_contents(struct smb_vol *volume_info)
3648 {
3649 kfree(volume_info->username);
3650 kzfree(volume_info->password);
3651 kfree(volume_info->UNC);
3652 kfree(volume_info->domainname);
3653 kfree(volume_info->iocharset);
3654 kfree(volume_info->prepath);
3655 }
3656
3657 void
3658 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3659 {
3660 if (!volume_info)
3661 return;
3662 cleanup_volume_info_contents(volume_info);
3663 kfree(volume_info);
3664 }
3665
3666
3667 #ifdef CONFIG_CIFS_DFS_UPCALL
3668 /*
3669 * cifs_build_path_to_root returns full path to root when we do not have an
3670 * exiting connection (tcon)
3671 */
3672 static char *
3673 build_unc_path_to_root(const struct smb_vol *vol,
3674 const struct cifs_sb_info *cifs_sb)
3675 {
3676 char *full_path, *pos;
3677 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3678 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3679
3680 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3681 if (full_path == NULL)
3682 return ERR_PTR(-ENOMEM);
3683
3684 strncpy(full_path, vol->UNC, unc_len);
3685 pos = full_path + unc_len;
3686
3687 if (pplen) {
3688 *pos = CIFS_DIR_SEP(cifs_sb);
3689 strncpy(pos + 1, vol->prepath, pplen);
3690 pos += pplen;
3691 }
3692
3693 *pos = '\0'; /* add trailing null */
3694 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3695 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3696 return full_path;
3697 }
3698
3699 /*
3700 * Perform a dfs referral query for a share and (optionally) prefix
3701 *
3702 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3703 * to a string containing updated options for the submount. Otherwise it
3704 * will be left untouched.
3705 *
3706 * Returns the rc from get_dfs_path to the caller, which can be used to
3707 * determine whether there were referrals.
3708 */
3709 static int
3710 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3711 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3712 int check_prefix)
3713 {
3714 int rc;
3715 unsigned int num_referrals = 0;
3716 struct dfs_info3_param *referrals = NULL;
3717 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3718
3719 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3720 if (IS_ERR(full_path))
3721 return PTR_ERR(full_path);
3722
3723 /* For DFS paths, skip the first '\' of the UNC */
3724 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3725
3726 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3727 &num_referrals, &referrals, cifs_remap(cifs_sb));
3728
3729 if (!rc && num_referrals > 0) {
3730 char *fake_devname = NULL;
3731
3732 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3733 full_path + 1, referrals,
3734 &fake_devname);
3735
3736 free_dfs_info_array(referrals, num_referrals);
3737
3738 if (IS_ERR(mdata)) {
3739 rc = PTR_ERR(mdata);
3740 mdata = NULL;
3741 } else {
3742 cleanup_volume_info_contents(volume_info);
3743 rc = cifs_setup_volume_info(volume_info, mdata,
3744 fake_devname);
3745 }
3746 kfree(fake_devname);
3747 kfree(cifs_sb->mountdata);
3748 cifs_sb->mountdata = mdata;
3749 }
3750 kfree(full_path);
3751 return rc;
3752 }
3753 #endif
3754
3755 static int
3756 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3757 const char *devname)
3758 {
3759 int rc = 0;
3760
3761 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3762 return -EINVAL;
3763
3764 if (volume_info->nullauth) {
3765 cifs_dbg(FYI, "Anonymous login\n");
3766 kfree(volume_info->username);
3767 volume_info->username = NULL;
3768 } else if (volume_info->username) {
3769 /* BB fixme parse for domain name here */
3770 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3771 } else {
3772 cifs_dbg(VFS, "No username specified\n");
3773 /* In userspace mount helper we can get user name from alternate
3774 locations such as env variables and files on disk */
3775 return -EINVAL;
3776 }
3777
3778 /* this is needed for ASCII cp to Unicode converts */
3779 if (volume_info->iocharset == NULL) {
3780 /* load_nls_default cannot return null */
3781 volume_info->local_nls = load_nls_default();
3782 } else {
3783 volume_info->local_nls = load_nls(volume_info->iocharset);
3784 if (volume_info->local_nls == NULL) {
3785 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3786 volume_info->iocharset);
3787 return -ELIBACC;
3788 }
3789 }
3790
3791 return rc;
3792 }
3793
3794 struct smb_vol *
3795 cifs_get_volume_info(char *mount_data, const char *devname)
3796 {
3797 int rc;
3798 struct smb_vol *volume_info;
3799
3800 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3801 if (!volume_info)
3802 return ERR_PTR(-ENOMEM);
3803
3804 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3805 if (rc) {
3806 cifs_cleanup_volume_info(volume_info);
3807 volume_info = ERR_PTR(rc);
3808 }
3809
3810 return volume_info;
3811 }
3812
3813 static int
3814 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3815 unsigned int xid,
3816 struct cifs_tcon *tcon,
3817 struct cifs_sb_info *cifs_sb,
3818 char *full_path)
3819 {
3820 int rc;
3821 char *s;
3822 char sep, tmp;
3823
3824 sep = CIFS_DIR_SEP(cifs_sb);
3825 s = full_path;
3826
3827 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3828 while (rc == 0) {
3829 /* skip separators */
3830 while (*s == sep)
3831 s++;
3832 if (!*s)
3833 break;
3834 /* next separator */
3835 while (*s && *s != sep)
3836 s++;
3837
3838 /*
3839 * temporarily null-terminate the path at the end of
3840 * the current component
3841 */
3842 tmp = *s;
3843 *s = 0;
3844 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3845 full_path);
3846 *s = tmp;
3847 }
3848 return rc;
3849 }
3850
3851 int
3852 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3853 {
3854 int rc;
3855 unsigned int xid;
3856 struct cifs_ses *ses;
3857 struct cifs_tcon *tcon;
3858 struct TCP_Server_Info *server;
3859 char *full_path;
3860 struct tcon_link *tlink;
3861 #ifdef CONFIG_CIFS_DFS_UPCALL
3862 int referral_walks_count = 0;
3863 #endif
3864
3865 #ifdef CONFIG_CIFS_DFS_UPCALL
3866 try_mount_again:
3867 /* cleanup activities if we're chasing a referral */
3868 if (referral_walks_count) {
3869 if (tcon)
3870 cifs_put_tcon(tcon);
3871 else if (ses)
3872 cifs_put_smb_ses(ses);
3873
3874 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3875
3876 free_xid(xid);
3877 }
3878 #endif
3879 rc = 0;
3880 tcon = NULL;
3881 ses = NULL;
3882 server = NULL;
3883 full_path = NULL;
3884 tlink = NULL;
3885
3886 xid = get_xid();
3887
3888 /* get a reference to a tcp session */
3889 server = cifs_get_tcp_session(volume_info);
3890 if (IS_ERR(server)) {
3891 rc = PTR_ERR(server);
3892 goto out;
3893 }
3894 if ((volume_info->max_credits < 20) ||
3895 (volume_info->max_credits > 60000))
3896 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3897 else
3898 server->max_credits = volume_info->max_credits;
3899 /* get a reference to a SMB session */
3900 ses = cifs_get_smb_ses(server, volume_info);
3901 if (IS_ERR(ses)) {
3902 rc = PTR_ERR(ses);
3903 ses = NULL;
3904 goto mount_fail_check;
3905 }
3906
3907 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3908 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3909 cifs_dbg(VFS, "persistent handles not supported by server\n");
3910 rc = -EOPNOTSUPP;
3911 goto mount_fail_check;
3912 }
3913
3914 /* search for existing tcon to this server share */
3915 tcon = cifs_get_tcon(ses, volume_info);
3916 if (IS_ERR(tcon)) {
3917 rc = PTR_ERR(tcon);
3918 tcon = NULL;
3919 if (rc == -EACCES)
3920 goto mount_fail_check;
3921
3922 goto remote_path_check;
3923 }
3924
3925 /* tell server which Unix caps we support */
3926 if (cap_unix(tcon->ses)) {
3927 /* reset of caps checks mount to see if unix extensions
3928 disabled for just this mount */
3929 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3930 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3931 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3932 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3933 rc = -EACCES;
3934 goto mount_fail_check;
3935 }
3936 } else
3937 tcon->unix_ext = 0; /* server does not support them */
3938
3939 /* do not care if a following call succeed - informational */
3940 if (!tcon->pipe && server->ops->qfs_tcon)
3941 server->ops->qfs_tcon(xid, tcon);
3942
3943 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3944 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3945
3946 remote_path_check:
3947 #ifdef CONFIG_CIFS_DFS_UPCALL
3948 /*
3949 * Perform an unconditional check for whether there are DFS
3950 * referrals for this path without prefix, to provide support
3951 * for DFS referrals from w2k8 servers which don't seem to respond
3952 * with PATH_NOT_COVERED to requests that include the prefix.
3953 * Chase the referral if found, otherwise continue normally.
3954 */
3955 if (referral_walks_count == 0) {
3956 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3957 false);
3958 if (!refrc) {
3959 referral_walks_count++;
3960 goto try_mount_again;
3961 }
3962 }
3963 #endif
3964
3965 /* check if a whole path is not remote */
3966 if (!rc && tcon) {
3967 if (!server->ops->is_path_accessible) {
3968 rc = -ENOSYS;
3969 goto mount_fail_check;
3970 }
3971 /*
3972 * cifs_build_path_to_root works only when we have a valid tcon
3973 */
3974 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3975 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3976 if (full_path == NULL) {
3977 rc = -ENOMEM;
3978 goto mount_fail_check;
3979 }
3980 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3981 full_path);
3982 if (rc != 0 && rc != -EREMOTE) {
3983 kfree(full_path);
3984 goto mount_fail_check;
3985 }
3986
3987 if (rc != -EREMOTE) {
3988 rc = cifs_are_all_path_components_accessible(server,
3989 xid, tcon, cifs_sb,
3990 full_path);
3991 if (rc != 0) {
3992 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3993 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3994 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3995 rc = 0;
3996 }
3997 }
3998 kfree(full_path);
3999 }
4000
4001 /* get referral if needed */
4002 if (rc == -EREMOTE) {
4003 #ifdef CONFIG_CIFS_DFS_UPCALL
4004 if (referral_walks_count > MAX_NESTED_LINKS) {
4005 /*
4006 * BB: when we implement proper loop detection,
4007 * we will remove this check. But now we need it
4008 * to prevent an indefinite loop if 'DFS tree' is
4009 * misconfigured (i.e. has loops).
4010 */
4011 rc = -ELOOP;
4012 goto mount_fail_check;
4013 }
4014
4015 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
4016
4017 if (!rc) {
4018 referral_walks_count++;
4019 goto try_mount_again;
4020 }
4021 goto mount_fail_check;
4022 #else /* No DFS support, return error on mount */
4023 rc = -EOPNOTSUPP;
4024 #endif
4025 }
4026
4027 if (rc)
4028 goto mount_fail_check;
4029
4030 /* now, hang the tcon off of the superblock */
4031 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
4032 if (tlink == NULL) {
4033 rc = -ENOMEM;
4034 goto mount_fail_check;
4035 }
4036
4037 tlink->tl_uid = ses->linux_uid;
4038 tlink->tl_tcon = tcon;
4039 tlink->tl_time = jiffies;
4040 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
4041 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4042
4043 cifs_sb->master_tlink = tlink;
4044 spin_lock(&cifs_sb->tlink_tree_lock);
4045 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4046 spin_unlock(&cifs_sb->tlink_tree_lock);
4047
4048 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4049 TLINK_IDLE_EXPIRE);
4050
4051 mount_fail_check:
4052 /* on error free sesinfo and tcon struct if needed */
4053 if (rc) {
4054 /* If find_unc succeeded then rc == 0 so we can not end */
4055 /* up accidentally freeing someone elses tcon struct */
4056 if (tcon)
4057 cifs_put_tcon(tcon);
4058 else if (ses)
4059 cifs_put_smb_ses(ses);
4060 else
4061 cifs_put_tcp_session(server, 0);
4062 }
4063
4064 out:
4065 free_xid(xid);
4066 return rc;
4067 }
4068
4069 /*
4070 * Issue a TREE_CONNECT request.
4071 */
4072 int
4073 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
4074 const char *tree, struct cifs_tcon *tcon,
4075 const struct nls_table *nls_codepage)
4076 {
4077 struct smb_hdr *smb_buffer;
4078 struct smb_hdr *smb_buffer_response;
4079 TCONX_REQ *pSMB;
4080 TCONX_RSP *pSMBr;
4081 unsigned char *bcc_ptr;
4082 int rc = 0;
4083 int length;
4084 __u16 bytes_left, count;
4085
4086 if (ses == NULL)
4087 return -EIO;
4088
4089 smb_buffer = cifs_buf_get();
4090 if (smb_buffer == NULL)
4091 return -ENOMEM;
4092
4093 smb_buffer_response = smb_buffer;
4094
4095 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
4096 NULL /*no tid */ , 4 /*wct */ );
4097
4098 smb_buffer->Mid = get_next_mid(ses->server);
4099 smb_buffer->Uid = ses->Suid;
4100 pSMB = (TCONX_REQ *) smb_buffer;
4101 pSMBr = (TCONX_RSP *) smb_buffer_response;
4102
4103 pSMB->AndXCommand = 0xFF;
4104 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
4105 bcc_ptr = &pSMB->Password[0];
4106 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
4107 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
4108 *bcc_ptr = 0; /* password is null byte */
4109 bcc_ptr++; /* skip password */
4110 /* already aligned so no need to do it below */
4111 } else {
4112 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
4113 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
4114 specified as required (when that support is added to
4115 the vfs in the future) as only NTLM or the much
4116 weaker LANMAN (which we do not send by default) is accepted
4117 by Samba (not sure whether other servers allow
4118 NTLMv2 password here) */
4119 #ifdef CONFIG_CIFS_WEAK_PW_HASH
4120 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
4121 (ses->sectype == LANMAN))
4122 calc_lanman_hash(tcon->password, ses->server->cryptkey,
4123 ses->server->sec_mode &
4124 SECMODE_PW_ENCRYPT ? true : false,
4125 bcc_ptr);
4126 else
4127 #endif /* CIFS_WEAK_PW_HASH */
4128 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
4129 bcc_ptr, nls_codepage);
4130 if (rc) {
4131 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
4132 __func__, rc);
4133 cifs_buf_release(smb_buffer);
4134 return rc;
4135 }
4136
4137 bcc_ptr += CIFS_AUTH_RESP_SIZE;
4138 if (ses->capabilities & CAP_UNICODE) {
4139 /* must align unicode strings */
4140 *bcc_ptr = 0; /* null byte password */
4141 bcc_ptr++;
4142 }
4143 }
4144
4145 if (ses->server->sign)
4146 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4147
4148 if (ses->capabilities & CAP_STATUS32) {
4149 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4150 }
4151 if (ses->capabilities & CAP_DFS) {
4152 smb_buffer->Flags2 |= SMBFLG2_DFS;
4153 }
4154 if (ses->capabilities & CAP_UNICODE) {
4155 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4156 length =
4157 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4158 6 /* max utf8 char length in bytes */ *
4159 (/* server len*/ + 256 /* share len */), nls_codepage);
4160 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4161 bcc_ptr += 2; /* skip trailing null */
4162 } else { /* ASCII */
4163 strcpy(bcc_ptr, tree);
4164 bcc_ptr += strlen(tree) + 1;
4165 }
4166 strcpy(bcc_ptr, "?????");
4167 bcc_ptr += strlen("?????");
4168 bcc_ptr += 1;
4169 count = bcc_ptr - &pSMB->Password[0];
4170 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4171 pSMB->hdr.smb_buf_length) + count);
4172 pSMB->ByteCount = cpu_to_le16(count);
4173
4174 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4175 0);
4176
4177 /* above now done in SendReceive */
4178 if (rc == 0) {
4179 bool is_unicode;
4180
4181 tcon->tidStatus = CifsGood;
4182 tcon->need_reconnect = false;
4183 tcon->tid = smb_buffer_response->Tid;
4184 bcc_ptr = pByteArea(smb_buffer_response);
4185 bytes_left = get_bcc(smb_buffer_response);
4186 length = strnlen(bcc_ptr, bytes_left - 2);
4187 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4188 is_unicode = true;
4189 else
4190 is_unicode = false;
4191
4192
4193 /* skip service field (NB: this field is always ASCII) */
4194 if (length == 3) {
4195 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4196 (bcc_ptr[2] == 'C')) {
4197 cifs_dbg(FYI, "IPC connection\n");
4198 tcon->ipc = true;
4199 tcon->pipe = true;
4200 }
4201 } else if (length == 2) {
4202 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4203 /* the most common case */
4204 cifs_dbg(FYI, "disk share connection\n");
4205 }
4206 }
4207 bcc_ptr += length + 1;
4208 bytes_left -= (length + 1);
4209 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4210
4211 /* mostly informational -- no need to fail on error here */
4212 kfree(tcon->nativeFileSystem);
4213 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4214 bytes_left, is_unicode,
4215 nls_codepage);
4216
4217 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4218
4219 if ((smb_buffer_response->WordCount == 3) ||
4220 (smb_buffer_response->WordCount == 7))
4221 /* field is in same location */
4222 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4223 else
4224 tcon->Flags = 0;
4225 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4226 }
4227
4228 cifs_buf_release(smb_buffer);
4229 return rc;
4230 }
4231
4232 static void delayed_free(struct rcu_head *p)
4233 {
4234 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4235 unload_nls(sbi->local_nls);
4236 kfree(sbi);
4237 }
4238
4239 void
4240 cifs_umount(struct cifs_sb_info *cifs_sb)
4241 {
4242 struct rb_root *root = &cifs_sb->tlink_tree;
4243 struct rb_node *node;
4244 struct tcon_link *tlink;
4245
4246 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4247
4248 spin_lock(&cifs_sb->tlink_tree_lock);
4249 while ((node = rb_first(root))) {
4250 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4251 cifs_get_tlink(tlink);
4252 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4253 rb_erase(node, root);
4254
4255 spin_unlock(&cifs_sb->tlink_tree_lock);
4256 cifs_put_tlink(tlink);
4257 spin_lock(&cifs_sb->tlink_tree_lock);
4258 }
4259 spin_unlock(&cifs_sb->tlink_tree_lock);
4260
4261 kfree(cifs_sb->mountdata);
4262 kfree(cifs_sb->prepath);
4263 call_rcu(&cifs_sb->rcu, delayed_free);
4264 }
4265
4266 int
4267 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4268 {
4269 int rc = 0;
4270 struct TCP_Server_Info *server = ses->server;
4271
4272 if (!server->ops->need_neg || !server->ops->negotiate)
4273 return -ENOSYS;
4274
4275 /* only send once per connect */
4276 if (!server->ops->need_neg(server))
4277 return 0;
4278
4279 set_credits(server, 1);
4280
4281 rc = server->ops->negotiate(xid, ses);
4282 if (rc == 0) {
4283 spin_lock(&GlobalMid_Lock);
4284 if (server->tcpStatus == CifsNeedNegotiate)
4285 server->tcpStatus = CifsGood;
4286 else
4287 rc = -EHOSTDOWN;
4288 spin_unlock(&GlobalMid_Lock);
4289 }
4290
4291 return rc;
4292 }
4293
4294 int
4295 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4296 struct nls_table *nls_info)
4297 {
4298 int rc = -ENOSYS;
4299 struct TCP_Server_Info *server = ses->server;
4300
4301 ses->capabilities = server->capabilities;
4302 if (linuxExtEnabled == 0)
4303 ses->capabilities &= (~server->vals->cap_unix);
4304
4305 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4306 server->sec_mode, server->capabilities, server->timeAdj);
4307
4308 if (ses->auth_key.response) {
4309 cifs_dbg(VFS, "Free previous auth_key.response = %p\n",
4310 ses->auth_key.response);
4311 kfree(ses->auth_key.response);
4312 ses->auth_key.response = NULL;
4313 ses->auth_key.len = 0;
4314 }
4315
4316 if (server->ops->sess_setup)
4317 rc = server->ops->sess_setup(xid, ses, nls_info);
4318
4319 if (rc)
4320 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4321
4322 return rc;
4323 }
4324
4325 static int
4326 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4327 {
4328 vol->sectype = ses->sectype;
4329
4330 /* krb5 is special, since we don't need username or pw */
4331 if (vol->sectype == Kerberos)
4332 return 0;
4333
4334 return cifs_set_cifscreds(vol, ses);
4335 }
4336
4337 static struct cifs_tcon *
4338 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4339 {
4340 int rc;
4341 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4342 struct cifs_ses *ses;
4343 struct cifs_tcon *tcon = NULL;
4344 struct smb_vol *vol_info;
4345
4346 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4347 if (vol_info == NULL)
4348 return ERR_PTR(-ENOMEM);
4349
4350 vol_info->local_nls = cifs_sb->local_nls;
4351 vol_info->linux_uid = fsuid;
4352 vol_info->cred_uid = fsuid;
4353 vol_info->UNC = master_tcon->treeName;
4354 vol_info->retry = master_tcon->retry;
4355 vol_info->nocase = master_tcon->nocase;
4356 vol_info->local_lease = master_tcon->local_lease;
4357 vol_info->no_linux_ext = !master_tcon->unix_ext;
4358 vol_info->sectype = master_tcon->ses->sectype;
4359 vol_info->sign = master_tcon->ses->sign;
4360
4361 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4362 if (rc) {
4363 tcon = ERR_PTR(rc);
4364 goto out;
4365 }
4366
4367 /* get a reference for the same TCP session */
4368 spin_lock(&cifs_tcp_ses_lock);
4369 ++master_tcon->ses->server->srv_count;
4370 spin_unlock(&cifs_tcp_ses_lock);
4371
4372 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4373 if (IS_ERR(ses)) {
4374 tcon = (struct cifs_tcon *)ses;
4375 cifs_put_tcp_session(master_tcon->ses->server, 0);
4376 goto out;
4377 }
4378
4379 tcon = cifs_get_tcon(ses, vol_info);
4380 if (IS_ERR(tcon)) {
4381 cifs_put_smb_ses(ses);
4382 goto out;
4383 }
4384
4385 if (cap_unix(ses))
4386 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4387 out:
4388 kfree(vol_info->username);
4389 kzfree(vol_info->password);
4390 kfree(vol_info);
4391
4392 return tcon;
4393 }
4394
4395 struct cifs_tcon *
4396 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4397 {
4398 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4399 }
4400
4401 /* find and return a tlink with given uid */
4402 static struct tcon_link *
4403 tlink_rb_search(struct rb_root *root, kuid_t uid)
4404 {
4405 struct rb_node *node = root->rb_node;
4406 struct tcon_link *tlink;
4407
4408 while (node) {
4409 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4410
4411 if (uid_gt(tlink->tl_uid, uid))
4412 node = node->rb_left;
4413 else if (uid_lt(tlink->tl_uid, uid))
4414 node = node->rb_right;
4415 else
4416 return tlink;
4417 }
4418 return NULL;
4419 }
4420
4421 /* insert a tcon_link into the tree */
4422 static void
4423 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4424 {
4425 struct rb_node **new = &(root->rb_node), *parent = NULL;
4426 struct tcon_link *tlink;
4427
4428 while (*new) {
4429 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4430 parent = *new;
4431
4432 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4433 new = &((*new)->rb_left);
4434 else
4435 new = &((*new)->rb_right);
4436 }
4437
4438 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4439 rb_insert_color(&new_tlink->tl_rbnode, root);
4440 }
4441
4442 /*
4443 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4444 * current task.
4445 *
4446 * If the superblock doesn't refer to a multiuser mount, then just return
4447 * the master tcon for the mount.
4448 *
4449 * First, search the rbtree for an existing tcon for this fsuid. If one
4450 * exists, then check to see if it's pending construction. If it is then wait
4451 * for construction to complete. Once it's no longer pending, check to see if
4452 * it failed and either return an error or retry construction, depending on
4453 * the timeout.
4454 *
4455 * If one doesn't exist then insert a new tcon_link struct into the tree and
4456 * try to construct a new one.
4457 */
4458 struct tcon_link *
4459 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4460 {
4461 int ret;
4462 kuid_t fsuid = current_fsuid();
4463 struct tcon_link *tlink, *newtlink;
4464
4465 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4466 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4467
4468 spin_lock(&cifs_sb->tlink_tree_lock);
4469 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4470 if (tlink)
4471 cifs_get_tlink(tlink);
4472 spin_unlock(&cifs_sb->tlink_tree_lock);
4473
4474 if (tlink == NULL) {
4475 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4476 if (newtlink == NULL)
4477 return ERR_PTR(-ENOMEM);
4478 newtlink->tl_uid = fsuid;
4479 newtlink->tl_tcon = ERR_PTR(-EACCES);
4480 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4481 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4482 cifs_get_tlink(newtlink);
4483
4484 spin_lock(&cifs_sb->tlink_tree_lock);
4485 /* was one inserted after previous search? */
4486 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4487 if (tlink) {
4488 cifs_get_tlink(tlink);
4489 spin_unlock(&cifs_sb->tlink_tree_lock);
4490 kfree(newtlink);
4491 goto wait_for_construction;
4492 }
4493 tlink = newtlink;
4494 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4495 spin_unlock(&cifs_sb->tlink_tree_lock);
4496 } else {
4497 wait_for_construction:
4498 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4499 TASK_INTERRUPTIBLE);
4500 if (ret) {
4501 cifs_put_tlink(tlink);
4502 return ERR_PTR(-ERESTARTSYS);
4503 }
4504
4505 /* if it's good, return it */
4506 if (!IS_ERR(tlink->tl_tcon))
4507 return tlink;
4508
4509 /* return error if we tried this already recently */
4510 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4511 cifs_put_tlink(tlink);
4512 return ERR_PTR(-EACCES);
4513 }
4514
4515 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4516 goto wait_for_construction;
4517 }
4518
4519 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4520 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4521 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4522
4523 if (IS_ERR(tlink->tl_tcon)) {
4524 cifs_put_tlink(tlink);
4525 return ERR_PTR(-EACCES);
4526 }
4527
4528 return tlink;
4529 }
4530
4531 /*
4532 * periodic workqueue job that scans tcon_tree for a superblock and closes
4533 * out tcons.
4534 */
4535 static void
4536 cifs_prune_tlinks(struct work_struct *work)
4537 {
4538 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4539 prune_tlinks.work);
4540 struct rb_root *root = &cifs_sb->tlink_tree;
4541 struct rb_node *node;
4542 struct rb_node *tmp;
4543 struct tcon_link *tlink;
4544
4545 /*
4546 * Because we drop the spinlock in the loop in order to put the tlink
4547 * it's not guarded against removal of links from the tree. The only
4548 * places that remove entries from the tree are this function and
4549 * umounts. Because this function is non-reentrant and is canceled
4550 * before umount can proceed, this is safe.
4551 */
4552 spin_lock(&cifs_sb->tlink_tree_lock);
4553 node = rb_first(root);
4554 while (node != NULL) {
4555 tmp = node;
4556 node = rb_next(tmp);
4557 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4558
4559 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4560 atomic_read(&tlink->tl_count) != 0 ||
4561 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4562 continue;
4563
4564 cifs_get_tlink(tlink);
4565 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4566 rb_erase(tmp, root);
4567
4568 spin_unlock(&cifs_sb->tlink_tree_lock);
4569 cifs_put_tlink(tlink);
4570 spin_lock(&cifs_sb->tlink_tree_lock);
4571 }
4572 spin_unlock(&cifs_sb->tlink_tree_lock);
4573
4574 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4575 TLINK_IDLE_EXPIRE);
4576 }
CRIS linux kernel tree